Slurry balance pipe jacking construction method

Abstract

The invention discloses a slurry balance pipe jacking construction method. A slurry balance jacking pipe comprises a plurality of pipe joints, and the method comprises the following steps: anti-drag slurry is stirred on the ground, the anti-drag slurry comprises 13 wt%-17 wt% of bentonite, 0.5 wt%-1 wt% of sodium carbonate, 0.1 wt%-0.3 wt% of sodium carboxymethyl cellulose and the balance of water; soaking is carried out in anti-drag slurry and and in water; the anti-drag slurry is pumped between the outer wall of the pipe joint and the soil body, and a slurry ring sleeve is formed on the periphery of the pipe joint; the first pipe joint is jacked in place, grouting is stopped, and the first pipe joint is detached; a next pipe joint is installed between the first pipe joint and a heading machine, and grouting and jacking are conducted; and circulation is conducted till jacking of all the pipe joints is completed. A certain amount of anti-drag slurry is injected into the outer wall of the pipeline through the grouting holes in the pipe joints, the slurry ring sleeve is formed on the periphery of the pipeline, the friction force between the outer wall of the pipe joint and a soil layer is reduced, and therefore the jacking force during jacking is reduced.

Description

technical field [0001] The invention relates to the technical field of pipe jacking construction, in particular to a mud-water balance pipe jacking construction method. Background technique [0002] The mud-water balance pipe jacking construction is a mechanical and automatic pipe jacking construction method that cuts the soil body at a full section, uses mud-water pressure to balance the earth pressure and groundwater pressure, and uses mud-water as the medium for transporting spoil. The mud-water balance pipe jacking system is mainly composed of a pipe jacking head, a ground operation platform and other auxiliary equipment. There is a PLC control box inside the machine head, and the ground operation platform sends an action signal to the machine head to control the movement of the machine head. The mud discharge system removes the spoil, the crane lowers the pipe, and the pipe is jacked in sections by the jack. In the mud-water balance pipe jacking construction, in order ...

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Problems solved by technology

In the mud-water balance pipe jacking construction, in order to reduce the frictional resistance during the jacking process, the method of evenly brushing industrial paraffin on the outer wall of the pipe is usually adopted in many places. Although this method can reduce the frictional resistance during the jacking process, but it doesn't work very well

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