Construction method for treating ultra-deep plain concrete diaphragm wall guide hole joints

Abstract

An embodiment of the invention discloses a construction method for treating ultra-deep plain concrete diaphragm wall guide hole joints. The method comprises the following steps: surveying and settingout: plane surveying and elevation surveying are performed to determine a datum traverse and an elevation control point; guide wall fabrication: the bottom wall axis and the position of a guide wall are set out by a total station, the bottom is cleared manually after the guide wall is excavated, concrete is poured after a formwork of the guide wall is built, and the formwork is removed after strength reaches 70%; trenching construction: concrete is poured into trenches, and trench section detection, bottom clearing and wall brushing are performed; installation of conduits: the conduits are inserted into the position at elevation of 300-800 mm from the bottom of the trenches, and the concrete storage in conduit collecting hoppers ensures the initial pouring quantity; concrete pouring: pouring is performed at constant speed to ensure that the pouring rising speed is not lower than 2 m / h; rotary drilling of guide holes: when strength reaches 1.5 MPa after pouring construction of an antecedent diaphragm wall is constructed, a rotary drilling rig is used to drill holes in the antecedent wall, instead of a fore shaft pipe or a joint box, to treat the joints, and trenching construction isperformed on adjacent following walls after drilling. The problems of long construction period and high cost of the existing plain concrete diaphragm wall are solved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of tunnel construction, and in particular to a construction method for treating the joints of lead holes in connecting walls of ultra-deep plain ground. Background technique [0002] With the continuous development of my country's infrastructure construction, underground rail transit and high-rise buildings are increasing, and the excavation depth of foundation pits is increasing, and the impact of pressurized water on the safety of foundation pits is also increasing. As an effective foundation pit support method, the underground diaphragm wall has the characteristics of high rigidity and good impermeability. [0003] In the shield shafts of subway stations and elevator shafts of high-rise buildings, etc., due to the installation of equipment and other reasons, the excavation depth is deeper. The usual method is to use plain concrete ground connection walls in large foundation pits as s...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the embodiment of the present invention provides a construction method for treating the joints of the lead-in hole of the ultra-deep plain ground wall to solve the problem of the long construction period and high cost of the existing plain ground wall, and the use of locking pipes or joint boxes that are prone to broken pipes and winding. flow, buried pipe problem

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