Prefabricated continuous wall unit, underground continuous wall and construction method of underground continuous wall

Abstract

The invention relates to the field of underground structure construction, in particular to a prefabricated continuous wall unit. The prefabricated continuous wall unit comprises a prefabricated continuous wall unit body, wherein connectors are arranged at the two ends of the prefabricated continuous wall unit body, and rebars protruding out of the surfaces of the connectors are arranged in the prefabricated continuous wall unit body; two L-shaped steel plates are arranged at the left side and the right side of the front surface of the prefabricated continuous wall unit body respectively, and the upper end and the lower end of each L-shaped steel plate are flush with the upper end and the lower end of the prefabricated continuous wall unit body respectively. The invention further provides an underground continuous wall formed by connection of at least two prefabricated continuous wall units through the connectors and the L-shaped steel plates. Compared with the prior art, the prefabricated continuous wall unit and the underground continuous wall have the beneficial effects that rigidity is high, seepage-proofing performance is high, and a good foundation pit engineering support effect, reasonable dispersion of wall shearing force transmission paths and effective prevention of underground water seepage can be guaranteed when the underground continuous wall serves as a supporting structure and a basement outer wall or an upper bearing member during reverse construction.

Description

technical field [0001] The invention relates to the field of underground structure construction, in particular to a prefabricated continuous wall unit, an underground continuous wall and a construction method thereof. Background technique [0002] With the gradual acceleration of the pace of rail transit and urbanization construction, there are more and more infrastructure constructions such as urban subways, high-speed rails, underground stations, and underground plazas. As an enclosure structure, underground diaphragm walls have also been widely used in foundation pit engineering support. development applications. At present, the underground diaphragm wall used for foundation pit support generally adopts the method of laying steel cages in the pre-constructed groove section and pouring concrete, and taking certain measures at the joints of the diaphragm wall (cross prefabricated joints, I-shaped prefabricated joints or lock joints) The groove formed by the pipe) to form a...

AI Technical Summary

Problems solved by technology

However, it is difficult to ensure the strength and anti-seepage performance of the underground diaphragm wall and joints under the condition of large groundwater pressure and construction load. On the one hand, it is difficult to prevent the concrete from flowing around and the high external Under the effect of water and soil pressure, even if joint treatment devices such as lock pipes are used, the bypass flow path is only extended, and the joints are still permeable under the action of high water and soil pressure; on the other hand, continuous underground When the wall is used as the load-bearing component of the building, the existing joints are not rigid enough. For example, if the cross steel plate is used as the rigid joint component, under the action of external water and soil pressure and live load, it is easy to cause instability on one side of the cross steel plate longitudinally arranged along the underground diaphragm wall. , even denatured destruction

In summary, the existing underground diaphragm walls have the disadvantages of low rigidity at the joints and poor anti-seepage performance, especially when the underground diaphragm wall is also used as a supporting structure, the outer wall of the basement, or the upper load-bearing member in the upside-down construction, the foundation cannot be guaranteed. The support effect of the pit engineering, the reasonable dispersion of the wall shear force transfer path and the effective prevention of groundwater seepage

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