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Scottish Water gets Paisley sewer underway

A state-of-the-art machine which will construct a key part of a one-mile-long wastewater tunnel under the streets of Paisley has been launched by Scottish Water.

The two parts of the Microtunnel Boring Machine (MTBM) was lowered into a shaft by a giant crane in Bladda Lane, Paisley on Monday, for assembly below ground and started construction of the tunnel.

Amey, working for Scottish Water, is constructing the large diameter interceptor sewer which will form the major part of the £17M Scottish Water project to improve the water quality and natural environment in two local rivers.

Brian Boland, the project manager, said: “We are delighted to have reached this milestone on the project, after a lot of preparatory work, and to have lowered the tunnel boring machine onto position at the launch chamber. Once it was assembled below ground, the machine was presented to the rock face and has now started its work on boring through the earth and installing the pipe. After four years of planning this project, in liaison with the Scottish Environment Protection Agency (SEPA) and Renfrewshire Council, it is great that the tunnelling proper is now under way.”

The machine, launched at one of the 15 shafts along the tunnel route, will install the first third of the tunnel which will be 1,200mm in diameter. Two other machines will install the second and third stretches of the tunnel, which will be 1,500mm and 1,000mm in diameter.

Powered by an external hydraulic power pack, the first MTBM will operate at about eight linear metres per day, removing 45 to 50 tonnes of earth a day.

The tunnel will be installed by the pipe jacking method, with individual sections of concrete pipe installed sequentially and jacked into position to the rear of the MTBM once the machine has removed the soil. It will be installed mainly in mudstone and siltstone.

The new stretch of sewer will have a diameter of up to 1.5 metres and will be installed at depths of between 4m and 20m.

The project, which includes the installation of Combined Sewer Overflows (CSOs) in the town centre,will substantially reduce the frequency of spills from the sewer network into the Espedair Burn and White Cart Water in storm conditions.

The investment, which is the biggest of its kind Scottish Water has ever made in Renfrewshire, is part of the company’s £250M, five-year programme of work, launched in 2013, to improve river water quality and the natural environment and tackle flooding across the Greater Glasgow area. 

Author: Maureen Gaines, Editor, WET News Find on Google+
Topic: Sewer Networks
Tags: Scottish Water , tunnelling , construction , CSOs

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