Construction method for inserting impermeable blankets in cement-soil continuous wall to form composite curtain and composite curtain prepared with construction method

Abstract

The invention relates to the technical field of waterproof curtains for foundation pits, and discloses a construction method for inserting impermeable blankets in a cement-soil continuous wall to forma composite curtain and the composite curtain prepared with the construction method. The construction method specifically includes the following steps that (1) the cement-soil continuous wall is constructed according to the conventional method; (2) before initial setting of the cement-soil continuous wall, the impermeable blankets are inserted in the cement-soil continuous wall from the top of the cement-soil continuous wall in the depth direction of the cement-soil continuous wall, every two adjacent impermeable blankets are lap-jointed, and then impermeable materials are injected to the lap-jointed parts of every two adjacent impermeable blankets. Under the conditions that same waterproof and impermeable effects are achieved, the construction method has the advantages that the thicknessof the cement-soil continuous wall can be reduced substantially, the project cost can be saved greatly, the construction cost can be reduced, besides, the influence of the construction process on thestratums and the surroundings is low, when a support structure of a foundation pit is deformed relatively greatly, the waterproof effect of the impermeable blankets is basically not affected, and themethod is particularly applicable to projects which have strict impermeable effects and cement-soil continuous wall curtains are required to be formed through penetration of sand layers.

Description

technical field [0001] The invention relates to the technical field of foundation pit water-stop curtains, in particular to a construction method for inserting an anti-seepage blanket into a cement-soil continuous wall to form a composite curtain and the prepared composite curtain. Background technique [0002] The water-stop curtain is mainly used to prevent or reduce the side wall of the foundation pit and the groundwater at the bottom of the foundation pit from flowing into the foundation pit. In the prior art, the water-stop curtain generally adopts technologies such as cement-soil mixing pile curtain, high-pressure rotary jet or swing jet grouting curtain, stirring-jet grouting curtain, and canal-cut cement-soil wall. The above-mentioned water-stop curtain has the following defects: (1) In order to ensure the water-stop effect, the curtain should have a certain thickness, so when using single-row occlusal curtain piles, the pile diameter is generally not less than 800mm...

AI Technical Summary

Problems solved by technology

The above-mentioned water-stop curtain has the following defects: (1) In order to ensure the water-stop effect, the curtain should have a certain thickness, so when using single-row occlusal curtain piles, the pile diameter is generally not less than 800mm; , pile diameter not less than 450mm

There are many cement-soil piles in the occlusal part, resulting in a lot of waste

(2) During the construction of curtain piles with large diameters or a large number, the formation will be greatly disturbed, and then ground subsidence will occur, which will affect the surrounding environment

(3) When the support structure of the foundation pit undergoes large deformation, the curtain is prone to produce through-type cracks, which affects its water-stop effect and poses hidden dangers to the safety of the foundation pit project

(4) When constructing curtain piles in the sand layer, its anti-seepage effect is not easy to guarantee

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