Construction method for underground continuous wall with conjoined reinforcing cage by topdown construction method

Abstract

The invention relates to a construction method for an underground continuous wall constructed by a reverse construction method and provided with a connected steel reinforcement cage, and the underground continuous wall formed by adopting the method. The continuous wall is provided with the connected steel reinforcement cage. Because a plain concrete area does not exist, cracks (penetrating the integral wall so as to cause wall collapse) are not caused, and the phenomenon of water leakage does not exist; the steel reinforcement cage is not integrally molded and hoisted into a deep groove, but is formed by welding in the dug deep groove, so a heavy crawler crane and the like are not needed, and the construction cost is lowered; and because the bottom end of a precast pile is already extended into a soil bearing layer and a soil lateral pressure acted on the continuous wall is finally born by the piles, the wall between the piles does not need to extend below a main body structural foundation pit of a building to be built, and large amount of material is saved.

Description

Technical field: [0001] The invention relates to a construction method of an underground diaphragm wall, in particular to a construction method of an underground diaphragm wall with a conjoined reinforcement cage constructed by an upside-down method. Background technique: [0002] The underground diaphragm wall is generally used for the support, enclosure and waterproofing of the foundation pit soil. When building a high-rise building on an open space surrounded by buildings, it is necessary to build an underground diaphragm wall around the excavated foundation before excavating the foundation. The existing building foundation is protected, and the construction steps of the formed underground diaphragm wall in the prior art are as follows: [0003] 1. According to the horizontal direction of the underground diaphragm wall, it is divided into several unit sections, and the construction of each unit section is carried out in sequence; [0004] 2. Concrete guide wall is poured...

AI Technical Summary

Problems solved by technology

[0012] 2. Since the concrete walls of each unit section need to have continuity, each unit section can only be poured in sequence, and multiple unit sections cannot be constructed at the same time at intervals, so the construction period is longer

[0013] 3. The depth of the underground continuous wall varies from more than ten meters to tens of meters. If the concrete is poured at one time over the entire depth, the quality cannot be guaranteed, and voids are prone to occur

[0014] 4. Using the soil on both sides of the deep trench as a formwork, even if there is a mud retaining wall, it is inevitable that part of the soil will collapse. If the side close to the foundation pit collapses, the formed concrete will be bulging and uneven. At the same time, these If the package invades the main structure boundary of the building to be built, it needs to be chiseled

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