Client: Public Utilities Board (PUB)
Projects: List of Link Sewers Completed
Project Script:
Singapore Deep Tunnel Sewerage System (“DTSS”) uses deep tunnel sewers and a network of link sewers to convey used water to 3 centralized water reclamation plants, which is then treated and purified to become NEWater or discharged to the sea through outfalls.
The link sewers connect the existing sewerage pipes from households and industries to the deep tunnel sewers. Constructed with depths ranging from 10m to 30m underground, a trenchless method (“pipe jacking technology”) is used to minimize disruption of activities above ground. Ranging from 0.3m to 3.0m in diameter, the link sewers total 60km in length under DTSS Phase 1.
Precast reinforced concrete jacking pipes are internally line 330o of link sewer circumference with minimum 2.5mm thick AKS high density polyethylene (HDPE) concrete protection liner.
| S/NO. | PROJECT & LOCATION | QUANTITY |
| 1 | Queensway/Commonwealth Ave Road Interchange Project | 2,000m2 |
| 2 | DTSS T-02 Bedok Tunnel - Link Sewer Project | 900m2 |
| 3 | Changi Sewers Development Project | 7,000m2 |
| 4 | Mustafa Centre Sewer Diversion Project | 500m2 |
| 5 | Kim Chuan Sewage Treatment Works West Works Phase 1 Redevelopment Stage 1 Contract 1 Project |
1,100m2 |
| 6 | Tuas Hockey Stick - Contract 5 | 12,730m2 |
| 7 | Tuas Hockey Stick - Contract 6 | 16,530m2 |
| 8 | DTSS - Seletar Link Sewers Contract 1 | 13,125m2 |
| 9 | DTSS - Tanah Merah Link Sewers | 60,000m2 |
| 10 | DTSS - Queensway Tunnel (T-06) | 95,000m2 |
| 11 | DTSS - Seletar Link Sewers Contract 2 | 10,000m2 |
| 12 | DTSS - Kolam Ayer Link Sewers | 25,000m2 |
| 13 | DTSS - Crawford Link Sewers Contract 1 | 12,000m2 |
| 14 | DTSS - Upper Thomson Link Sewers | 25,000m2 |
| 15 | DTSS - Kim Chuan Link Sewer - Contract 1 | 43,000m2 |
| 16 | DTSS - Kim Chuan Link Sewer - Contract 2 | 9,943m2 |
| 17 | KL Sewer Treatment Plant - Phase 1 | 90,000m2 |
| 18 | KL Sewer Treatment Plant - Phase 2 Package 2 - Juru STP | 6,000m2 |
| 19 | KL Sewer Treatment Plant - Phase 2 Package 2 - Sungei Nylor STP | 3,500m2 |
| 20 | Proposed NEWater Service Reservoir at Mandai Hill 68 | 15,000m2 |
| 21 | C483 Marina Coastal Expressway | 4,600m2 |
| 22 | Relieft Sewer at Lavendar Road | 12,850m2 |
| 23 | Sewers @ Tuas View Extension Phase 3B | 6,000m2 |
| 24 | Prop. Sewers from Tuas South Ave 12 to 6 | 16,000m2 |
| 25 | Prop. Sewers from Tuas South Ave 6 to 2 | 16,500m2 |
| 26 | Prop.Sewers from Tuas South Ave 14 to12 | 6,000m2 |
| 27 | Prop. Sewers Along Jalan Tukang & International Road | 10,000m2 |
| 28 | Sewerage Scheme to Phase Out Nee Soon Pumping Station - Contract 1 | 13,000m2 |
| 29 | Contract T2136 Sewer Diversion at Springleaf Station | 10,000m2 |
| 30 | Sewerage Scheme to Phase Out Nee Soon Pumping Station - Contract 2 | 13,000m2 |
| 31 | Proposed Sewers in Ang Mo Kio Ave 5 Areas | 22,000m2 |
| 32 | Proposed Sewers in Yishun Ave 7 Areas | 20,000m2 |
RC jacking pipes produced using vertical cast methodology
AKS HDPE liner wrapped around inner mould
Demoulding in progress
ID3000mm Precast RC Jacking Pipes Internally Lined (330⁰) with AKS 2.5mm thick HDPE
330⁰ AKS-lined RC jacking pipes with built-in stainless collar
Line load pull-out tests (2T/m) on cast-in-place AKS HDPE liner
ID1000mm Precast RC AKS-lined Jacking Pipes ready for dispatch to PUB project site(s)
Insitu field circumferential jointing in progress
Smooth HDPE capping strip placed to bridge pipe joint
Portable extrusion equipment using 5mm dia. HDPE welding rods
Close-up on double weld extrusion seam
HDPE patch (size 100mm x 100mm) covers grout hole and sand grinded in advance to receive extrusion
capping. Note protrusion of embedded copper wire which facilitates high voltage spark testing as part
of QA/QC on-site
Testing of “welded seam” utilizing a Spark Tester