sub-banner

SERVICES

Tunnelling

Tunnelling through rock or soil is our passion and challenging projects are motivating us to deliver the contract successfully, safe and on time. We specialize in the following :

Cross Passage Construction

“Cross passage is a small tunnel that connects two bored tunnels. The length of the cross passage can vary depending on the alignment of the bored tunnels. Excavation profiles and diameters of cross passages depend on the geology and the purpose of the cross passage. Horse-shoe shape, square, oval or round shape are the main excavation profiles. The excavation is mainly done manually and the need for immediate shotcrete application is crucial. In hard rock conditions, rock splitting and drill&blast methods are adopted. Asia Tunnelling & Construction P/L have the knowledge, experience, machinery and experienced personnel to construct cross passages in either rock or soil conditions.”

Pump Sump Construction

A Pump Sump is a sump usually constructed in the bored tunnels to collect and pump out water. Various dimensions of pump sumps can be constructed, depending usually on the amount of water to be collected. Drainage pipes lead out in the pump sump and a big pump sends the water out. The construction of this structure is challenging due to the vertical excavation and working beneath the bored tunnel. Asia Tunnelling & Construction P/L have the knowledge, experience, machinery and experienced personnel to construct pump sump in either rock or soil conditions.

Mine Tunnel Construction (NATM)

Mined tunnel construction is considered a special tunnelling technique in Singapore. Most tunnels in Singapore are constructed either by cut and cover method or tunnel boring machine (TBM). However, mined tunnels are very important especially when the C&C method or the bored tunnel is not feasible due to the close proximity of critical utilities such as high voltage electrical cables, gas pipes, and telecommunication cables or sewers and canals. Also, mined tunnels are often used to facilitate a launching chamber for TBMs or for small length tunnels were TBM method is too expensive.Various dimensions of mined tunnels can be constructed depending usually on the purpose of the tunnel. It can vary from a small tunnel connecting two buildings to a huge tunnel for launching a bored tunnel machine. Asia Tunnelling & Construction P/L have the knowledge, experience, machinery and experienced personnel to construct mined tunnels in either rock or soil conditions.

Shaft Sinking

A shaft is a vertical tunnel. Shafts are usually constructed when there is a need to reach a formation level below surface in a restricted area. They are used for sewer constructions, tunnels, TBM launching, storage area etc. Excavation can be done manually or mechanically depending on the diameter of the shaft and the geology encountered. In hard rock conditions, rock splitting and drill&blast methods are adopted. Asia Tunnelling & Construction P/L have the knowledge, experience, machinery and experienced personnel required for shaft sinking in either rock or soil conditions.