Ultra-deep foundation pit support non-intermittent composite transfer structure and construction method

Abstract

The invention relates to a non-intermittent composite transfer construction method for a super-deep foundation pit support. The construction method comprises the following steps of construction of a foundation pit support structure, excavation of a foundation pit, processing of a pit bottom, construction of a foundation slab and foundation slab supporting conversion, disassembly of concrete inner support, construction of a wire-netting sprayed concrete paving layer, welding a steel plate, filling a space between a row pile wall and an outer wall of a basement, construction of an underground main body and a supporting conversion structure and the like. According to the construction method, a supporting conversion structure adopts a supporting conversion measure with combination of a strong node support and a weak surface support, so that the transferring path for transferring the lateral soil pressure, borne by the concrete inner support originally, of the foundation pit onto the underground main body is more reasonable; and the construction field order and the construction efficiency are improved, the relevant measures ensure the construction quality of the supporting conversion structure, the additional deformation caused by disassembling the concrete inner support is dramatically lowered, and the construction method has better technical economic benefit.

Description

technical field [0001] The invention relates to a construction method for an ultra-deep foundation pit supporting a non-intermittent compound conversion structure, which is suitable for replacing the concrete internal support before the removal of the underground main structure when the pile wall or the continuous concrete wall is used as the foundation pit enclosure structure. Brace structure construction. Background technique [0002] With the development and utilization of underground space, more and more ultra-deep foundation pit enclosure structures are used in the construction of underground structures. For the most widely used supporting structure, the underground diaphragm wall or row of pile walls combined with reinforced concrete internal support, the internal support needs to be removed from bottom to top when the main underground structure is constructed after excavation of the foundation pit. In order to ensure the stability of the foundation pit and control de...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of excessive deformation of the inner support and dismantling of the enclosure structure existing in the support conversion construction of the existing foundation pit, and propose a construction method for the non-intermittent composite support conversion structure. The combination of node braces and weak surface braces is used to optimize the transmission path of earth pressure acting on the enclosure structure, and a waterproof layer is set between the enclosure structure and the outer wall of the basement to ensure the waterproof and anti-seepage requirements of the basement and at the same time it can be used as a construction Deformation seam

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