Construction method and equipment for continuous underground wall

Abstract

Durng the construction of continuous underground wall, after the hole is drilled by special drilling machine to set depth, grout is first pressed via the core tube of drilling rod to the hole, sealing device and the reinforced bar cage are then set in the hole, and concrete is finally deposited with the displaced grout is recovered. The construction method of the present invention has high speed. When the method is used in constructing pile, the constructed pile has high strength, large friction force with round soil layer because of the high pressure penetrated grout, no deposited sludge in the pile bottom, and thus high bearing capacity.

Description

technical field [0001] The invention relates to a building construction method and device, in particular to a construction method and device for an underground continuous wall poured with concrete. Background technique [0002] We know that the traditional underground diaphragm wall construction often uses mud circulation to protect the wall and drill holes. The mud has two main functions: one is the retaining wall, which supports the hole wall with liquid mud and forms a mud skin to stabilize the hole wall and prevent collapse; It is slag carrying, using the circulating mud as a carrier to carry and discharge the sand, gravel and mud slag drilled at the bottom of the hole. There is following shortcoming in this method: the first, construction speed is very slow. The mud used as the carrier is usually 3-5 times the volume of the drilled hole. During the circulation process, the viscosity, density, colloid rate, sand content and other indicators of the mud must be constantly...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: the first, the construction speed is very slow

The speed of mud carrying and slag discharge cannot be compared with that of long auger drilling machine for direct soil discharge

Second, a large amount of alkaline waste mud must be transported outside for treatment, causing pollution and increasing costs

Third, the rebar must first be inserted into the mud

This kind of mud-glued steel bar has poor grip between concrete and concrete.

Fourth, the joints are often muddy and leaking

Fifth, the sealer is difficult to pull out and often cannot be recycled

The piles made by the mud retaining method have silt sediment at the bottom of the pile, and a layer of mud skin between the pile and the soil around the pile, so the end bearing capacity of the pile and the frictional resistance of the pile side are greatly weakened, which seriously reduces the bearing capacity of the pile. carrying capacity

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