Nicoll Highway collapse
A destroyed highway with a gaping hole in the collapse site
Site of the collapsed highway
Date20 April 2004; 20 years ago (2004-04-20)
Time3:30 pm SST
LocationNicoll Highway, Singapore
Coordinates1°18′9″N 103°51′57″E / 1.30250°N 103.86583°E / 1.30250; 103.86583
TypeConstruction accident
CausePoorly designed strut-waler support system, leading to collapse of tunnel retaining wall and highway collapse
Deaths4
Non-fatal injuries3
ConvictedNishimatsu (contracting company) and three officials. LTA qualified personnel
SentenceFined under the Factories Act and Building Control Act

The Nicoll Highway collapse occurred in Singapore on 20 April 2004 at 3:30 pm local time when a Mass Rapid Transit (MRT) tunnel construction site caved in, leading to the collapse of the Nicoll Highway near the Merdeka Bridge. Four workers were killed and three were injured, delaying the construction of the Circle Line (CCL).

The collapse was caused by a poorly designed strut-waler support system, a lack of monitoring and proper management of data caused by human error, organisational failures of the Land Transport Authority (LTA) and construction contractors Nishimatsu and Lum Chang. The Singapore Civil Defence Force extracted three bodies from the site but were unable to retrieve the last due to unstable soil. An inquiry was conducted by Singapore's Manpower Ministry from August 2004 to May 2005, after which three Nishimatsu engineers and an LTA officer were charged under the Factories Act and Building Control Act respectively, and all four defendants were fined. The contractors gave S$30,000 (US$20,000[1]) each to the families of the victims as unconditional compensation.

Following the incident, the collapsed site was refilled, and Nicoll Highway was reinstated and reopened to traffic on 4 December 2004. Heng Yeow Pheow, an LTA foreman whose body was never recovered, was posthumously awarded the Pingat Keberanian (Medal of Valour) for helping his colleagues to safety ahead of himself. In response to inquiry reports, the LTA and the Building and Construction Authority (BCA) revised their construction safety measures so they were above industry standards. The CCL tunnels were realigned, with Nicoll Highway station rebuilt to the south of the original site underneath Republic Avenue. The station and tunnels opened on 17 April 2010, three years later than planned.

Background

Nicoll Highway and Merdeka Bridge

The Singapore Improvement Trust first planned Nicoll Highway in the late 1940s to relieve the heavy rush-hour traffic along Kallang Road and provide an alternative route from Singapore's city centre to Katong and Changi.[2] These plans were finalised in July 1953;[3] they included construction of a bridge spanning the Kallang and Rochor rivers.[4] The construction contract for Kallang Bridge was awarded to Paul Y. Construction Company in association with Messrs Hume Industries and Messrs Sime Darby for $4.485 million (US$15 million in 2021[1][5]) in December 1954.[6] On 22 June 1956, Kallang Bridge was renamed Merdeka Bridge to reflect "the confidence and aspiration of the people of Singapore".[7] Merdeka Bridge and Nicoll Highway opened on 17 August that year; crowds gathered on both ends of the bridge to witness the opening ceremony.[8][9] By August 1967, the highway and the bridge had been widened to accommodate seven lanes.[10][11]

Nicoll Highway station

See also: Circle MRT line

Nicoll Highway station was first announced in November 1999 as part of the Mass Rapid Transit's (MRT) Marina Line (MRL), which consisted of six stations from Dhoby Ghaut to Stadium.[12][13] In 2001, Nicoll Highway station became part of Circle Line (CCL) Stage 1 when the MRL was incorporated into the CCL.[14] The contract for the construction of Nicoll Highway station and tunnels was awarded to a joint venture between Nishimatsu Construction Co Ltd [ja] and Lum Chang Building Contractors Pte Ltd at S$270 million (US$200 million[1]) on 31 May 2001.[15][16][17] In 1996, the joint venture was investigated for breaching safety rules in a previous project; infringements included loose planks on its scaffolding. In 1997, the companies damaged underground telecommunications cables in another underpass construction project.[18]

The site was on land reclaimed during the 1970s and consisted of silty old alluvium and a 40 m (130 ft) layer of marine clay resulting from sea-level changes of the Kallang Basin.[19][20] The station and tunnels were constructed from the "bottom-up": cut-and-cover excavation was supported by a network of steel king posts, walers, and struts to keep the site open.[21]

Incident

A map depicting the incident site near Nicoll Highway marked along the old alignment (in grey) leading to the original station site. The map also depicts the current alignment (in orange), with the relocated station site south of its original site
Map of the incident site

At about 3:30 pm local time on 20 April 2004, tunnels linking to Nicoll Highway station caved in along with a 100-metre (300-foot) stretch of Nicoll Highway near the abutment of Merdeka Bridge.[21] The incident happened when most of the workers were on a tea break. The collapse of a tunnel's retaining wall created a hole 100 m long, 130 m wide, and 30 m deep (330 by 430 by 100 ft).[22][23] One person was found dead and three others, who were working on driving machinery at the bottom of the site, were initially reported missing.[23] They included a foreman who had helped evacuate his workers to safety when the site collapsed but did not escape in time because a flight of exit stairs collapsed.[24] Three injured workers were taken to hospital for treatment; two of them were discharged the same day.[23] No motorists were driving along the stretch of road when it collapsed[21] and others stopped in time.[23]

Three power cables were severed, resulting in a 15-minute blackout in the Esplanade, Suntec City, and Marina Square regions.[25] The collapse of the highway damaged a gas service line.[25] From initial reports, eyewitnesses heard explosions and saw flames flashing across the highway;[23][26] the Land Transport Authority (LTA), Singapore's transport agency, said it had no evidence of an explosion and that the witnesses might have mistaken the loud sound of the collapse for an explosion. As a precautionary measure, gas supply to the damaged pipe was shut off.[23]

Rescue and safety measures

The Singapore Civil Defence Force (SCDF) arrived at the site at 3:42 pm. After rescuing the three injured people, specialist SCDF units, such as the Disaster Assistance and Rescue Team and Search Platoon, arrived as reinforcements to search for the missing workers. The first dead victim was found at 6:07 pm.[27] All machinery was turned off as the SCDF used a life-detector device in the collapse site but nothing was detected and sniffer dogs were brought into the search. The second body was recovered at 11:42 pm on 21 April.[28][29]

Prime Minister Goh Chok Tong visited the site on 21 April; he praised the coordination between the SCDF and the Public Utilities Board (PUB) for the ongoing rescue efforts and expressed relief at the small number of fatalities.[30] Goh extended his condolences to the families of the victims and said the rescue efforts should be the priority rather than apportioning blame. He added the government would convene a public inquiry.[28][30][31] President S R Nathan visited the site on 22 April to pay tribute to the rescue workers.[32]

A third body was recovered from the site on 22 April at 12:15 am. The SCDF had to vertically excavate through a pile of rubble and debris located within three cavities, two of which were flooded and blocked by twisted steel beams and struts. The operation presented significant difficulty due to the limited space for manoeuvring within the cavities and the lack of visibility in flooded areas. The LTA detected stability problems on 23 April at 1:05 am and grouting was implemented to stabilise the soil while water was pumped out from cavities, allowing rescuers to further investigate.[27][33] Heavy rain in the afternoon caused soil erosion and halted the search.[27] Because of the instability of the collapsed area that could bury rescue workers and cause more damage to the surrounding area, the search for the foreman, Heng Yeow Pheow, was called off at 3:30 pm.[24][34][35]

The Nicoll Highway collapse led to the deaths of four people:

Safety measures were implemented after the collapse to minimise further damage to the collapsed area. A damaged canal had to be blocked up to prevent water from the Kallang River from entering the site, and canvas sheets were laid on slopes in the site to protect the soil.[21] While the surrounding buildings were assessed to be safe,[25] they were later monitored for stability with additional settlement markers and electro-level beams that were installed at the nearby Golden Mile Complex.[40][41] The LTA halted work at 16 of the 24 CCL excavation sites so these could be reviewed.[22][42][43]

The Merdeka bridge spanning over the Kallang River and the Crawford Underpass
The Merdeka Bridge over the Crawford Underpass

Near the incident site, the approach slab before the abutment of Merdeka Bridge had collapsed.[40] To prevent displacement of the first span triggering the collapse of the 610-metre (2,000 ft) bridge, the first and second spans of the bridge were cut to isolate the first span.[44] This also allowed Crawford Underpass beneath the bridge to be reopened.[45] This project began on 23 April and was completed on 28 April.[46] Eight prism points and five tiltmeters were installed to monitor any bridge movements.[40]

The collapsed site was quickly stabilised through the injection of concrete into areas that were vulnerable to movement or further collapse. Several vehicles, equipment and construction materials were retrieved using a specialised crane.[47][48] The remaining equipment and materials at the site were buried under infill to avoid further collapse. Access to the collapsed site via the completed parts of the tunnel and the shaft was sealed off.[47]

Committee of Inquiry

Singaporean authorities dismissed terrorism and sabotage as causes of the incident.[49][50] On 22 April, Singapore's Ministry of Manpower established a Committee of Inquiry (COI) to investigate the cause of the incident. Senior District Judge Richard Magnus was appointed Chairman; he was assisted by assessors Teh Cee Ing from the Nanyang Technological University (NTU) and Lau Joo Ming from the Housing and Development Board.[51][52] The COI called for 143 witnesses to provide evidence, including 14 experts.[53] The COI visited the site on 23 April and the inquiry was originally scheduled for 1 June.[54] Because all parties involved would need two-and-a-half months to prepare due to complex technical content, the inquiry was postponed to 2 August.[55][56]

Inquiry

At the first hearing of the inquiry, it was established by the inquiry panel that there were "fundamental" design flaws in the worksite due to incorrect analysis of soil conditions by the contractors, leading to more pressure on the retaining walls.[57][58] In April, the LTA had said the collapse happened without warning[59] but the LTA had already found flaws in Nishimatsu–Lum Chang's design in October 2001: the contractor used a design-software simulator with incorrect parameters. An alternative design had been proposed in consultation with an NTU professor but the contractor had rejected the design.[60] The LTA technical advisor for design management had advised against excavation of the site due to incorrect data.[61]

In the two months before the cave-in, the tunnel's retaining walls had moved more than the maximum allowed.[61][62] The contractors had petitioned the LTA to increase the agreed maximum threshold of movement.[61] The contractors had miscalculated the amount of stress on the retaining walls but gave the LTA repeated assurances that their calculations were in order.[60] Nishimatsu's senior on-site supervisor Teng Fong Sin claimed ignorance of the significance of the trigger values taken from the retaining wall. Teng said even if he had been aware of the significance, he lacked the authority to halt the ongoing work.[63]

No readings were taken in the two days leading up to the collapse.[61] This was because soil-monitoring instruments, which were placed roughly in the centre of the collapsed area, had been buried and the site supervisor Chakkarapani Balasubramani did not take the readings, although he raised the issue with the main contractor and was told the instruments would be dug out.[64] Nishimatsu engineer Arumaithurai Ahilan said he saw "nothing alarming" in the soil-movement readings and accused Balasubramani of lying in testimony. While he was also alerted to other ground movements, Nishimatsu addressed these cracks by applying cement patches, and no further corrective actions were taken because the buildings did not suffer any structural damage.[65] According to a system analyst from Monosys, the project's subcontractor, the strain-detecting sensors recorded readings that were still below trigger values at 3 pm. These readings were the last obtained before the collapse at 3:30 pm.[66]

The steel beams to hold up the walls had not been constructed when workers dug further into the site.[61] LTA supervisor Phang Kok Pin, whose duty was to confirm the correct installation of support beams, said he visited the pit typically once or twice a day. He conducted only sporadic inspections and heavily relied on reports from Nishimatsu contractors to confirm the accurate installation of the beams.[67]

Nishimatsu supervisors were warned about failing support structures on the day of the collapse but instructed the subcontracting site supervisor Nallusamy Ramadoss to continue installing struts and pouring cement on the buckled struts to strengthen the wall. The struts continued to bend further before the collapse; Ramadoss warned his workers of the danger and evacuated them to safety.[68] Some workers said they were not warned of any danger or given any safety briefings but escaped in time.[69] Other workers also reported hearing "thungs" of bent walers before the cable bridge swayed, and everything around them trembled and collapsed.[70]

Resumption and conclusion

The inquiry was adjourned on 30 August[71] and resumed on 6 September.[72] An interim report that was released to the government on 13 September noted "glaring and critical shortcomings" in the construction project that were seen in other ongoing construction projects.[73] Additionally, inexperienced personnel had been appointed to monitor the safety of the retaining wall system.[74] The interim report recommended a more-effective safety management system, an industry standard for the safety of temporary works, and a higher standard of reliability and accuracy in monitoring data.[75] The interim report was released so "corrective measures" could be implemented for other construction projects.[73]

The LTA project manager Wong Hon Peng, who was informed of the deflection readings four days before the collapse, admitted his lack of respect for safety, that his initial response was "any solution adopted should not bring about claims against LTA" and that he failed to take heed of the warnings.[76] The project manager from Nishimatsu, Yoshiaki Chikushi, also said he was unaware of the extent to which the struts supporting the construction site had buckled, and was consulting with the LTA on the day of the collapse after being alerted of the failing struts.[77] To meet deadlines, Chikushi had accelerated the hacking of a wall that led to the removal of support beams in the excavation, and approved the grouting method that left gaps under some cables running across the site. He did not consider how these methods would cause problems.[78] The final phase of the hearing, which involved the consultation of experts on the causes of weakening of the retaining wall, began on 24 January 2005 and concluded on 2 February. More than 170 witnesses were brought in during the 80 days of the inquiry.[79]

The COI released its final report on 13 February 2005; it concluded the incident was preventable and had been caused by human error and organisational failures.[80] The strut-waler support system was poorly designed and was weaker than it should have been, and there was a lack of monitoring and proper management of data.[81] The COI report said the "warning signs", such as excessive wall deflections and surging inclinometer readings, were not seriously addressed, and blamed the collapse on the contractor.[82] The people responsible were accused of indifference and laxity towards the worksite safety of the construction project.[83] To address the lack of safety culture stated in the report, the COI restated several recommendations from its interim report to improve the safety of construction projects.[84] The government accepted the report's recommendations.[85][86]

Aftermath

Compensation to the victims

Family of the victims were given S$30,000 (US$20,000[1]) each as unconditional, ex gratia compensation by Nishimatsu and Lum Chang.[87][88] Heng's family received an additional S$380,000 (US$280,000[1]) in settlements from the three construction firms involved with the collapse and S$630,000 (US$460,000[1]) in public donations. The money from the public donations was diverted into a trust fund that was set up by Heng's Member of Parliament Irene Ng from which expenses for his children's upkeep could be drawn until 2019.[89]

Honours and awards

A park bench with a memorial plaque dedicating to Heng
The memorial bench at Tampines Tree Park dedicated to Heng

Nine SCDF officers who were involved in the search and rescue efforts were awarded the Pingat Keberanian (Medal of Valour). SCDF Commissioner James Tan, who was in charge of the rescue team, was awarded the Pingat Pentadbiran Awam – Emas (Public Administration Medal – Gold) and 18 other SCDF officers were awarded other State medals.[90][91] Heng was posthumously honoured with the Pingat Keberanian for prioritising the safety of his colleagues over his own escape in May 2004.[24][92] In 2014, three former colleagues whom Heng rescued inaugurated a memorial bench at Tampines Tree Park dedicated to the foreman.[93] The ceremony, initiated by MP Irene Ng, was attended by Heng's wife and his two children. The bench was funded by the Tampines Changkat Citizens' Consultative Committee.[94] A commemorative stone and plaque were also erected at the former site marking where Heng was believed to be buried. On every anniversary, workers from Kori Construction visit the site to offer prayers and incense in honour of Heng.[93][95]

Criminal trials

The COI determined that Nishimatsu, L&M Geotechnic, Monosys and thirteen professionals from the LTA and Nishimatsu were responsible for the collapse.[83][96] Those who received warnings included Nishimatsu personnel, an LTA engineer, soil engineers, and L&M Geotechnic and Monosys, which were engaged in soil analysis.[97] Three others were given counselling by the Manpower Ministry. Nishimatsu and three of its personnel faced criminal charges under the Factories Act. A qualified personn from LTA, who was project director of the CCL and responsible for monitoring the site's readings,[98] faced charges under the Building Control Act.[83][99]

The CCL project director's trial began on 3 October 2005;[98] he was found guilty and fined S$8,000 (US$6,000[1]) on 24 November.[100] On 28 April 2006, three senior executives from Nishimatsu were fined; the company's project director was fined S$120,000 (US$88,000[1]) for his failure to take appropriate measures concerning the buckling walls and for compromising safety due to flawed monitoring of instruments. The company's design manager and project coordinator were each fined S$200,000 (US$100,000[1]) for giving "blind approval" to the flawed designs.[101]

Construction safety reforms

The LTA and the Building and Construction Authority (BCA) introduced new safety protocols such as a new Project Safety Review which identifies and reduces risks of hazards. Safety requirements are now set above industry standards, which include doubling scaffold access for evacuation routes in an emergency and one man-cage at each excavation area for rescuers.[102] LTA no longer allows contractors to outsource their own geotechnical firms, but appoints an independent monitoring firm to check on instruments.[103] Contractors are also no longer permitted to design and supervise their own temporary works, with the work carried out by independent consultants.[104][105] Under the Safety Performance Scheme, contractors are now offered incentives or penalties and are required to maintain a Risk Register that identifies all hazards.[105][106] The contractors and LTA meet every six months over safety performances, and identify and mitigate potential risks during the progress of works.[102] These new regulations were reported to have driven up the costs of CCL construction works, alongside inflation and increasing costs of concrete.[107]

Highway reinstatement

A green field, with a rectangulalr plot fenced off, is the present collapse site now backfilled
The site of the collapse, now backfilled

Following the collapse, the LTA closed off the stretch of Nicoll Highway from Middle Road to Mountbatten Road.[108] Alternative roads leading into the city, including the junction of Kallang Road and Crawford Street, were widened to accommodate diverted traffic. The LTA also converted a bus-only lane at Lorong 1 Geylang towards Mountbatten Road into a traffic lane.[109] On 25 April 2004, a part of Nicoll Highway running from Mountbatten Road to Stadium Drive was restored for motorists accessing the area around National Stadium of Singapore.[110] Crawford Underpass, which runs under Merdeka Bridge, reopened on 29 April.[111]

After the collapsed site was refilled, the highway was rebuilt on bored piles so the rebuilt stretch would not be affected by future excavation works.[112] Reconstruction of the highway began on 24 August 2004[113] and the new stretch of highway reopened on 4 December.[114][115]

Station relocation and opening

A map depicting the former tunnel alignment (in grey) and the new alignment (in orange), with the relocated station site south of its original site
The relocated station and realigned tunnels

On 4 February 2005, the LTA announced Nicoll Highway station would be relocated 100 m (330 ft) south of the original site along Republic Avenue with a new tunnel alignment between Millenia (now Promenade) and Boulevard (now Stadium) stations.[116] The LTA decided against rebuilding at the original site due to higher costs and engineering challenges posed by debris left there.[117][118] Prior to the collapse, Nicoll Highway and the adjacent Promenade station were planned to have a cross-platform interchange with an unspecified future line; that had to be realigned because the new Nicoll Highway station had no provision to be an interchange.[119][120] The new tunnels were designed by Aecom consultants and tunnels to the previous site were demolished with special machinery from Japan.[104]

The new station was built using the top-down method while the 1.8 km (1.1 mi) of tunnels were bored,[121] minimising their impact on the environment.[117] Retaining walls for the new station site were 1.5 m (4.9 ft) thick and entrenched 60 m (200 ft) underground – twice the previous depth.[117][121] To reduce ground movement, the walls would be embedded into hard layers of soil.[121][122] To ensure stability and prevent movement of the bored tunnels, the contractor implemented perforated vertical drains, and ground improvement efforts were undertaken in the vicinity of tunnel drainage sumps and cross-passages.[104]

On 29 September 2005, the LTA marked the start of the new Nicoll Highway station's construction with a groundbreaking ceremony,[123] during which the diaphragm walls were first installed.[124] Due to the tunnel collapse, the completion date of CCL Stage 1 was initially delayed from 2007 to 2009,[125] and further postponed until 2010.[126] Nicoll Highway station opened on 17 April 2010, along with the stations on CCL Stages 1 and 2.[127][128]

References

  1. ^ a b c d e f g h i "Official Exchange Rate (LCU per US$, Period Average)". World Bank Open Data. World Bank. Archived from the original on 25 July 2017. Retrieved 20 October 2023.
  2. ^ Cornelius, Tessie (29 June 1947). "New Multi-million Dollar Highway for S'pore". Sunday Tribune. p. 1. Retrieved 8 March 2024 – via NewspaperSG.
  3. ^ "Council's $11,000,000 plan will ease bottleneck". The Straits Times. 11 July 1953. p. 7. Retrieved 8 March 2024 – via NewspaperSG.
  4. ^ "$7 Million Bridge to Be Started Next Year". The Straits Times. 23 October 1953. p. 1. Retrieved 8 March 2024 – via NewspaperSG.
  5. ^ "M212931 - Consumer Price Index (CPI), 2019 As Base Year, Annual". Department of Statistics, Singapore. 23 May 2023. Retrieved 10 September 2023.
  6. ^ "Kallang Bridge Contract". The Straits Times. 25 December 1954. p. 7. Retrieved 8 March 2024 – via NewspaperSG.
  7. ^ "The Merdeka Bridge: Symbol of Confidence". The Straits Times. 22 June 1956. p. 9. Retrieved 8 March 2024 – via NewspaperSG.
  8. ^ "Today it will Rain Roses on Merdeka Bridge". The Straits Times. 17 August 1956. p. 9. Retrieved 8 March 2024 – via NewspaperSG.
  9. ^ Hall, Nan (18 August 1956). "Tens of Thousands Turned Out to Cheer". The Straits Times. p. 1. Retrieved 8 March 2024 – via NewspaperSG.
  10. ^ "Merdeka Bridge a 7-Lane Highway Soon". The Straits Times. 5 August 1966. p. 4. Retrieved 8 March 2024 – via NewspaperSG.
  11. ^ "Traffic Plans for Nicoll Highway". The Straits Times. 5 August 1967. p. 10. Retrieved 8 March 2024 – via NewspaperSG.
  12. ^ Yeo, Geraldine (25 November 1999). "6 Stations for Marina Line's First Phase". The Straits Times. p. 3.
  13. ^ Chew, Marissa (25 November 1999). "Marina Rail Line to be Scaled Back". Business Times. p. 3.
  14. ^ "Circle Line and Kallang/Paya Lebar Expressway: Joint Press Statement by Ministry of Communications and Information Technology and Ministry of Law". Ministry of Information, Communications and the Arts. 28 April 2001. Archived from the original on 6 March 2020. Retrieved 10 October 2020 – via National Archives of Singapore.
  15. ^ "Stage 1 of the Circle Line". Land Transport Authority. Archived from the original on 10 April 2008. Retrieved 10 October 2020.
  16. ^ "Civil Works Contract Awarded for the Marina Line". Land Transport Authority. Archived from the original on 1 May 2009. Retrieved 23 April 2010.
  17. ^ "Marina Mass Rapid Transit (MRT) Line (C824 – Design and Build Tender)". CPG Consultants. Archived from the original on 9 October 2020. Retrieved 10 October 2020.
  18. ^ "Nishimatsu and Lum Chang the Main Contractors for Circle Line". Channel NewsAsia. 20 April 2004. Archived from the original on 8 August 2004. Retrieved 25 August 2023.
  19. ^ Whittle & Davies 2006, pp. 3–4.
  20. ^ "Singapore, South East Road Map". Singapore: Survey Department. 1973. Archived from the original on 19 March 2024. Retrieved 19 March 2024 – via NewspaperSG.
  21. ^ a b c d Land Transport Authority 2005, p. 1.
  22. ^ a b Cheong 2012, p. 82.
  23. ^ a b c d e f Loh, Sharon (21 April 2004). "MRT Worksite Wrecks Nicoll Highway". The Straits Times. p. 1. Archived from the original on 3 December 2021. Retrieved 3 January 2022.
  24. ^ a b c d "State Honours Nicoll Highway Site Foreman". Today. 20 May 2004. Archived from the original on 7 June 2004. Retrieved 23 August 2023.
  25. ^ a b c Ministry of Information, Communications and the Arts 2004, p. 4.
  26. ^ Chin Lian, Goh (14 August 2004). "Tragedy Unfolds Before His Eyes..." The Straits Times. Archived from the original on 16 August 2004. Retrieved 23 August 2023.
  27. ^ a b c "Nicoll Highway Cave-In". Singapore Civil Defence Force. 30 September 2011. Archived from the original on 19 April 2015. Retrieved 7 February 2022.
  28. ^ a b Tan, Hsueh Yun (22 April 2004). "SCDF Men Find a Second Body". The Straits Times. p. 1. Archived from the original on 3 December 2021. Retrieved 3 January 2022.
  29. ^ a b Cher, Derek (22 April 2004). "Nicoll Highway Collapse: Dead Chinese National Leaves Behind Wife and Daughter". Channel NewsAsia. Archived from the original on 4 August 2004. Retrieved 23 August 2023.
  30. ^ a b "Transcript of Prime Minister Goh Chok Tong's Doorstep Interview on Nicoll Highway Collapse on 21 April 2004" (PDF). Ministry of Information, Communications and the Arts. 21 April 2004. Archived (PDF) from the original on 22 August 2023. Retrieved 23 August 2023 – via National Archives of Singapore.
  31. ^ "PM Goh Says Priority is to Find Missing Men in Nicoll Highway Cave-in, Public Inquiry Later". Channel NewsAsia. 26 April 2004. Archived from the original on 4 August 2004. Retrieved 23 August 2023.
  32. ^ "President Nathan Pays Tribute to Rescue Workers at Nicoll Highway". Channel NewsAsia. 22 April 2004. Archived from the original on 4 August 2004. Retrieved 23 August 2023.
  33. ^ Hwee, Goh (22 April 2004). "Rain Won't Halt Rescue Efforts Unless Safety an Issue: SCDF". Channel NewsAsia. Archived from the original on 4 August 2004. Retrieved 23 August 2023.
  34. ^ Loh, Sharon (24 April 2004). "Search Called Off". The Straits Times. p. 1. Archived from the original on 4 January 2022. Retrieved 3 January 2022.
  35. ^ Tan, James (24 April 2004). "Risk of Being Buried Alive". The Straits Times. p. H6.
  36. ^ Ng, Julia; Cheong, Lain (21 April 2004). "Nicoll Highway Collapse: Dead Crane Operator Tried to Escape but Got Trapped". Channel NewsAsia. Archived from the original on 4 August 2004. Retrieved 23 August 2023.
  37. ^ "Third Body Found at Highway Collapse site, Identified as LTA Engineer". Channel NewsAsia. 22 April 2004. Archived from the original on 4 August 2004. Retrieved 23 August 2023.
  38. ^ Leow, Joanne (21 April 2004). "Nicoll Highway Collapse: Missing Engineer Planned to Migrate After Contract Ends". Channel NewsAsia. Archived from the original on 4 August 2004. Retrieved 23 August 2023.
  39. ^ Leow, Joanne (24 April 2004). "Nicoll Highway Cave-In: Foreman Heng's Family Struggles to Come to Terms with Tragedy". Channel NewsAsia. Archived from the original on 4 August 2004. Retrieved 26 August 2023.
  40. ^ a b c Land Transport Authority 2005, p. 2.
  41. ^ "Constant Checks to Make Sure Nearby Buildings Sound". The Straits Times. Singapore Press Holdings. 22 April 2004. p. H2.
  42. ^ "Main Contractor Told to Stop All Excavation Work". The Straits Times. 24 April 2004. p. H3.
  43. ^ "Work on Singapore MRT Line Put on Hold". The Star. 27 April 2004. Archived from the original on 24 October 2021. Retrieved 23 August 2023.
  44. ^ "Section of Merdeka Bridge to be Cut". Channel NewsAsia. 22 April 2004. Archived from the original on 4 August 2004. Retrieved 24 August 2023.
  45. ^ Ramesh, S (26 April 2004). "Section of Merdeka Bridge to Be Cut so Underpass Can Re-open". Channel NewsAsia. Archived from the original on 4 August 2004. Retrieved 23 August 2023.
  46. ^ Choo, Johnson (28 April 2004). "Work to Separate Merdeka Bridge from Nicoll Highway Cave-In Completed". Channel NewsAsia. Archived from the original on 6 June 2004. Retrieved 23 August 2023.
  47. ^ a b Mulchand, Arti (25 April 2004). "Stabilising Ground Is Now Top Priority". The Straits Times. p. 11.
  48. ^ Kaur, Karamjit (2 August 2004). "Almost 500 Items Recovered from Cave-In Site". The Straits Times. p. 4.
  49. ^ "Authorities rule out terrorism in Singapore highway collapse". The Star. 20 April 2004. Archived from the original on 17 October 2023. Retrieved 23 August 2023.
  50. ^ "No Foul Play Suspected in Nicoll Highway Collapse: Wong Kan Seng". Channel NewsAsia. 20 April 2004. Archived from the original on 8 August 2004. Retrieved 25 August 2023.
  51. ^ "Singapore's MOM Sets Up Committee of Inquiry into Highway Collapse". Channel NewsAsia. 22 April 2004. Archived from the original on 7 August 2004. Retrieved 23 August 2023.
  52. ^ "Appointment of a Committee of Inquiry into the Cause of the Incident at the MRT Circle Line Worksite That Led to the Collapse of the Nicoll Highway" (PDF). Ministry of Manpower. Archived (PDF) from the original on 23 August 2023. Retrieved 23 August 2023 – via National Archives of Singapore.
  53. ^ Ramesh, S (10 June 2004). "143 Witnesses to Give Evidence at Nicoll Highway Collapse Inquiry: MOM". Channel NewsAsia. Archived from the original on 4 August 2004. Retrieved 23 August 2023.
  54. ^ "Nicoll Highway Collapse Committee Visits Site". Channel NewsAsia. 23 April 2004. Archived from the original on 4 August 2004. Retrieved 25 August 2023.
  55. ^ "Pre-inquiry Conference on 14 May 2004 for the Inquiry into the Cause of the Incident at the Mrt Circle Line Worksite That Led to the Collapse of the Nicoll Highway on 20 April 2004" (PDF). Ministry of Manpower. Archived (PDF) from the original on 22 August 2023. Retrieved 25 August 2023 – via National Archives of Singapore.
  56. ^ "Singapore Starts Inquiry into Highway Collapse". Channel NewsAsia. 2 August 2004. Archived from the original on 4 August 2004. Retrieved 23 August 2023.
  57. ^ Woon, Wui Teck (3 August 2004). "Design Flaws at Worksite". The Straits Times. p. 1. Archived from the original on 23 August 2023. Retrieved 24 August 2023.
  58. ^ Loh, Dominique (7 August 2004). "LTA Blames Nishimatsu-Lum Chang for Nicoll Highway Collapse". Channel NewsAsia. Archived from the original on 17 November 2004. Retrieved 24 August 2023.
  59. ^ Tan, Christopher (22 April 2004). "It happened without warning: LTA". The Straits Times. p. 1. Archived from the original on 3 December 2021. Retrieved 3 January 2022.
  60. ^ a b Choo, Johnson (2 August 2004). "Flaws in Nishimatsu-Lum Chang's Design Detected As Early As 2001: LTA". Channel NewsAsia. Archived from the original on 13 November 2004. Retrieved 24 August 2023.
  61. ^ a b c d e Kaur, Karamjit (3 August 2004). "'Warning Signs' Noticed Since Last Year". The Straits Times. p. 1. Archived from the original on 23 August 2023. Retrieved 24 August 2023.
  62. ^ Loh, Dominique (18 August 2004). "Nicoll Highway Inquiry: Wall Movement Detected 2 Months Before Cave-In". Channel NewsAsia. Archived from the original on 11 October 2004. Retrieved 25 August 2023.
  63. ^ Loh, Dominique (3 August 2004). "Senior Nishimatsu Supervisor Did Not Know Significance of Stress on Walls". Channel NewsAsia. Archived from the original on 10 April 2005. Retrieved 25 August 2023.
  64. ^ Loh, Dominique (20 August 2004). "Soil Monitoring Instruments Buried Two Days Before Nicoll Highway Collapse". Channel NewsAsia. Archived from the original on 10 April 2005. Retrieved 24 August 2023.
  65. ^ Choo, Johnson (20 August 2004). "L&M; Lawyer Accuses Nishimatsu Engineer of Sleeping on the Job". Channel NewsAsia. Archived from the original on 13 November 2004. Retrieved 25 August 2023.
  66. ^ Woon, Wui Teck (13 August 2004). "Readings 'Normal 1/2 Hour Before Cave-In'". The Straits Times. Archived from the original on 13 August 2004. Retrieved 25 August 2023.
  67. ^ Cheong, Yvonne (30 August 2004). "Experts to Meet to Discuss Causes of Nicoll Highway Cave-In". Channel NewsAsia. Archived from the original on 11 October 2004. Retrieved 25 August 2023.
  68. ^ Loh, Dominique (5 August 2004). "Supervisors Disagreed on Works at Nicoll Highway Site Hours Before Cave-In". Channel NewsAsia. Archived from the original on 10 April 2005. Retrieved 24 August 2023.
  69. ^ Loh, Dominique (3 August 2004). "Workers Say No Alarm Sounded Before Nicoll Highway Collapse". Channel NewsAsia. Archived from the original on 10 April 2005. Retrieved 25 August 2023.
  70. ^ Goh, Chin Lian (4 August 2004). "Thung, Thung, Thung… Then Earth Trembled and Sank". The Straits Times. p. 2.
  71. ^ "Progress of Committee of Inquiry to Date" (PDF). Ministry of Manpower. 1 September 2004. Archived (PDF) from the original on 22 August 2023. Retrieved 24 August 2023 – via National Archives of Singapore.
  72. ^ Loh, Dominique (6 September 2004). "Nicoll Highway Inquiry Resumes After 4-Day Adjournment". Channel NewsAsia. Archived from the original on 6 September 2004. Retrieved 26 August 2023.
  73. ^ a b Ramesh, S. (13 September 2004). "Glaring and Critical Shortcomings Found in Circle Line Project". Channel NewsAsia. Archived from the original on 5 December 2004. Retrieved 26 August 2023.
  74. ^ Ministry of Information, Communications and the Arts 2004, p. 15.
  75. ^ Ministry of Information, Communications and the Arts 2004, pp. 11, 13, 15.
  76. ^ Choo, Johnson (30 November 2004). "Nicoll Highway Inquiry: LTA Project Manager Admits Being Irresponsible Towards Safety". Channel NewsAsia. Archived from the original on 11 December 2004. Retrieved 26 August 2023.
  77. ^ Woon, Wui Teck (2 October 2004). "Struts Were As Good As Gone, Admits Manager". The Straits Times. p. 10.
  78. ^ Woon, Wui Teck (30 September 2004). "'Rush to Hack Wall' Led to Reduced Support". The Straits Times. p. 5.
  79. ^ Cheong, Yvonne (2 February 2005). "Final Hearing of Expert Witness for Nicoll Highway Inquiry Ends". Channel NewsAsia. Archived from the original on 24 May 2005. Retrieved 26 August 2023.
  80. ^ Ministry of Manpower 2005, p. 2.
  81. ^ Ministry of Manpower 2005, p. 1.
  82. ^ Ministry of Manpower 2005, p. 7.
  83. ^ a b c Tan, Christopher (14 May 2005). "Panel Slams Safety at Worksite: Reckless, Sloppy and Indifferent". The Straits Times. p. 1. Archived from the original on 23 August 2023. Retrieved 26 August 2023.
  84. ^ Ministry of Manpower 2005, pp. 9–12.
  85. ^ "Government Response to the Final Report of the Committee of Inquiry into the Nicoll Highway Collapse". Ministry of Transport. 11 May 2005. Archived from the original on 22 April 2021. Retrieved 23 April 2021.
  86. ^ Popatlal, Asha (13 September 2004). "Nicoll Highway Inquiry: Govt Accepts Broad Thrust of Committee's Recommendations". Channel NewsAsia. Archived from the original on 6 May 2005. Retrieved 29 January 2022.
  87. ^ "Main Contractor Offers $30,000 Each to Grieving Families". The Straits Times. 23 April 2004. p. 3.
  88. ^ "Nicoll Highway MRT Contractors Offer Immediate S$30,000 Payment to Affected Families". Channel NewsAsia. 22 April 2004. Archived from the original on 4 August 2004. Retrieved 26 August 2023.
  89. ^ Aw, Cheng Wei (6 July 2014). "Nicoll Highway Widow: Money from Trust Fund Pays for Children's Upkeep". The Straits Times. Archived from the original on 23 April 2021. Retrieved 30 January 2021.
  90. ^ Nadarajan, Ben (20 May 2004). "Top Medal for Highway Tragedy Heroes". The Straits Times. p. 1. Archived from the original on 23 August 2023. Retrieved 23 August 2023.
  91. ^ Ramesh, S (19 May 2004). "Nicoll Highway Cave-In: Hero Foreman, 28 SCDF Officers to Be Awarded State Medals". Channel NewsAsia. Archived from the original on 10 December 2004. Retrieved 24 August 2023.
  92. ^ "Recipients". Prime Minister's Office Singapore. 27 September 2023. Archived from the original on 27 September 2023. Retrieved 27 September 2023.
  93. ^ a b Tan, Tam Mei (19 June 2014). "Memorial Set up in Tampines for Nicoll Highway Hero". The New Paper. Archived from the original on 10 February 2024. Retrieved 10 February 2024.
  94. ^ Seow, Joanna (15 June 2014). "Tampines Memorial Bench for 'Hero' of 2004 Nicoll Highway Collapse". The Straits Times. Archived from the original on 31 March 2024. Retrieved 31 March 2024.
  95. ^ Shah, Aslam (20 April 2024). "Nicoll Highway collapse: 20 years on, colleagues remember 'Hero Heng' who lost his life saving others". CNA. Retrieved 20 April 2024.
  96. ^ Ministry of Manpower 2005, pp. 3–6.
  97. ^ Loh, Dominique (13 May 2005). "Nicoll Highway Inquiry Recommends Warnings for Six People, Two Companies". Channel NewsAsia. Archived from the original on 24 May 2005. Retrieved 23 August 2023.
  98. ^ a b Popatlal, Asha (3 October 2005). "First of Nicoll Highway Criminal Trials Gets Underway". Channel NewsAsia. Archived from the original on 1 October 2007.
  99. ^ Popatlal, Asha (31 March 2005). "4 Individuals, Nishimatsu May Be Charged with Nicoll Highway Collapse". Channel NewsAsia. Archived from the original on 24 May 2005. Retrieved 26 August 2023.
  100. ^ "Ex-LTA Project Director Fined over Nicoll Highway Accident". Channel NewsAsia. 24 November 2005. Archived from the original on 26 November 2005.
  101. ^ Teo, Xuanwei (29 April 2006). "Nicoll Highway Trial: Executives Slapped with Fines". Today. p. 4 – via NewspaperSG.
  102. ^ a b Cheong 2012, p. 87.
  103. ^ Cheong 2012, p. 86.
  104. ^ a b c Cheong 2012, p. 85.
  105. ^ a b Shah, Aslam (20 April 2024). "20 years after Nicoll Highway collapse, construction industry stresses regular updates on safety protocols". CNA. Retrieved 20 April 2024.
  106. ^ Cheong 2012, pp. 86–87.
  107. ^ Tan, Christopher (15 September 2007). "Circle Line will exceed $6.7b budget". The Straits Times. Singapore Press Holdings. p. 3 – via NewspaperSG.
  108. ^ "Annex A" (PDF). Land Transport Authority. Archived from the original (PDF) on 26 July 2004. Retrieved 25 August 2023.
  109. ^ "LTA Improves Traffic Situation in Nicoll Highway Vicinity". Channel NewsAsia. 26 April 2004. Archived from the original on 4 August 2004. Retrieved 25 August 2023.
  110. ^ Choo, Johnson (25 April 2004). "Nicoll Highway Partially Reopened As Recovery Work Continues at Cave-In Site". Channel NewsAsia. Archived from the original on 7 August 2004. Retrieved 25 August 2023.
  111. ^ "Update on Progress of Repair Works for Nicoll Highway: Crawford Underpass Re-Opens to Traffic". Channel NewsAsia. 28 April 2004. Archived from the original on 4 August 2004. Retrieved 26 August 2023.
  112. ^ "Nicoll Highway Updates". Land Transport Authority. 27 April 2005. Archived from the original on 10 September 2007. Retrieved 23 April 2008.
  113. ^ Tan, Christopher (25 August 2004). "Work Begins to Rebuild Nicoll Highway". The Straits Times. Archived from the original on 25 August 2004. Retrieved 29 January 2022.
  114. ^ "Re-Opening Of Nicoll Highway". Land Transport Authority. 4 December 2009. Archived from the original on 1 May 2009. Retrieved 2 May 2009.
  115. ^ Choo, Johnson (4 December 2004). "Nicoll Highway Reopens to Traffic After Reconstruction". Channel NewsAsia. Archived from the original on 10 April 2005. Retrieved 29 January 2022.
  116. ^ "Nicoll Highway MRT to Be Built at New Site". Business Times. 5 February 2005. p. 9.
  117. ^ a b c Tan, Christopher (5 February 2005). "Slower but Safer Way to Rebuild Collapsed MRT Sector". The Straits Times. p. 8.
  118. ^ Wong, Siew Ying; Ng, Lian Cheong (4 February 2005). "Nicoll Highway Circle Line MRT to Be Located at Republic Avenue". Channel NewsAsia. Archived from the original on 25 May 2005. Retrieved 29 January 2022.
  119. ^ "Implementation of the Marina Line System". Land Transport Directory of Singapore. Singapore: Transportation Infrastructure Development. p. 48.
  120. ^ Tan, Christopher (5 February 2005). "Line Linked to Circle Line May Be Realigned". The Straits Times. p. 8. A planned MRT line meant to join the Circle Line at the original Nicoll Highway station may have to be realigned, the Land Transport Authority has indicated. It did not say which this would be.
  121. ^ a b c "Reconstruction of Circle Line MRT Tunnels and Station at Nicoll Highway". Ministry of Transport. 4 February 2005. Archived from the original on 22 April 2021. Retrieved 23 April 2021.
  122. ^ "Reconstruction of Circle Line MRT Tunnels and Station at Nicoll Highway". Land Transport Authority. Archived from the original on 28 July 2007. Retrieved 2 May 2009.
  123. ^ "Nicoll Highway Project Restarted". Today. 30 September 2005. p. 4 – via NewspaperSG.
  124. ^ "Construction of Nicoll Highway Station and Tunnels". Land Transport Authority. 29 September 2005. Archived from the original on 1 May 2009. Retrieved 2 May 2009.
  125. ^ "Circle Line Stage One Likely to Be Delayed by 2 Years: Yeo". Channel NewsAsia. 4 December 2004. Archived from the original on 7 May 2005. Retrieved 30 January 2022.
  126. ^ "LTA completes final tunnelling work on Circle Line". Channel NewsAsia. 17 August 2009. Archived from the original on 19 October 2012.
  127. ^ "Welcome Remarks by Mr Raymond Lim at the Opening of the Circle Line from Dhoby Ghaut to Bartley on 16 April 2010". Ministry of Transport. Archived from the original on 1 May 2020. Retrieved 1 May 2020.
  128. ^ "Circle Line from Bartley to Dhoby Ghaut to Open 17 April". Land Transport Authority. Archived from the original on 21 June 2011. Retrieved 26 January 2010.

Sources

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