Prefabricated underground diaphragm wall and method for constructing outer basement wall and floor slabs

Abstract

The invention discloses a prefabricated underground diaphragm wall and a method for constructing an outer basement wall and floor slabs. The prefabricated underground diaphragm wall comprises single wall bodies (1) and pile foundations (2). The single wall bodies (1) are longitudinally stacked so as to form a wall line. All the single wall bodies (1) and the pile foundations (2) of the wall line are tensioned through prestressed reinforcement bars (7) and prestress holes (3) are filled with cement paste. The inner surface of each single wall body (1) is provided with a row of preformed holes and a pre-buried steel plate. Each preformed hole is provided with a connecting reinforcement bar inside. The method is characterized in that the prestressed reinforcement bars (7) are tensioned, so that all the single wall bodies (1) and all the pile foundations (2) of the wall line are tensioned, and horizontal reinforcement bars of a floor slab reinforcement cage extend into the preformed holes and are in butt joint with the connecting reinforcement bars. According to the prefabricated underground diaphragm wall and the method for constructing the outer basement wall and the floor slabs, the construction speed can be increased, a working period can be shortened, the transverse shearing resistance and longitudinal pressure bearing capacity are good, and underground diaphragm wall concrete does not need to be knocked off when the floor slabs are constructed.

Description

technical field [0001] The invention relates to underground structure construction technology in the field of civil engineering, in particular to a prefabricated underground diaphragm wall and a method for constructing basement exterior walls and floors by using the prefabricated underground diaphragm wall. Background technique [0002] With the advancement of foundation pit support technology and the development of building underground structure technology, a kind of underground diaphragm wall integrating foundation pit surrounding pile wall and basement exterior wall has emerged. The supporting and water retaining functions of the pit enclosure pile wall to the foundation pit can also be directly used as the basement exterior wall to support the upper structure of the building. After the wall is constructed, there is no need to separately construct the foundation pit enclosure protection pile wall and the basement exterior wall. Therefore, the construction period can be gr...

AI Technical Summary

Problems solved by technology

This idea cannot be realized due to an insurmountable technical problem: that is, the longitudinal connection between the wall monomers, that is, the height direction, and the longitudinal connection between the continuous wall and the pile foundation cannot be realized. Insufficient shear strength and longitudinal bearing capacity, unable to bear the lateral pressure of the soil, and unable to support the longitudinal pressure of the superstructure of the building

Moreover, there is also a defect in this idea: since the underground diaphragm wall is prefabricated, when the basement floor slab needs to be poured and rammed, the concrete of the underground diaphragm wall at the same level as the floor slab must be knocked out to expose the steel bars, and then the floor steel bars and the underground diaphragm wall The steel bars are connected, and the floor concrete is finally poured, that is, the construction of the floor concrete must knock off the concrete of the underground diaphragm wall. The process is cumbersome and may even easily cause damage to the structure of the underground diaphragm wall.

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