Excavation supporting method for foundation pit close to existing building
A technology for existing buildings and foundation pits, which is applied in the field of foundation pit excavation and support, can solve problems such as reducing the stability of soil under existing buildings, and achieve the effect of improving the support effect and enhancing the friction force.
Inactive Publication Date: 2021-08-13
北京市地质工程有限责任公司
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Problems solved by technology
[0005] In view of the above-mentioned related technologies, the inventor believes that the pile-anchor support needs to be drilled, and the drilling will disturb the soil below the existing building, and there is a defect of reducing the stability of the soil below the existing building
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[0043] The following is attached Figure 1-6 The application is described in further detail.
[0044] The embodiment of the present application discloses a method for excavating and supporting a foundation pit adjacent to an existing building.
[0045] A method for excavating and supporting a foundation pit adjacent to an existing building comprises the following steps:
[0046] refer to figure 1 , S1, construction of slope protection pile 1; after measuring and setting out the positioning, firstly carry out the construction of slope protection pile 1, and proceed to the next step after the construction of slope protection pile 1 is completed.
[0047] refer to figure 1 and figure 2, S2, parallel operation of earth excavation and anchor cable construction; S3, anchor cable construction: drilling rig and anchor cable assembly 2 assembly are carried out at the same time, and the position of the original pile foundation 3 is determined according to the drawings of the origin...
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The invention relates to an excavation supporting method for a foundation pit close to an existing building, and belongs to the technical field of foundation pit excavation supporting. The excavation supporting method comprises the steps that S1, slope protection pile construction is conducted; S2, earth excavation and anchor cable construction are conducted in parallel; S3, in anchor cable construction, drilling machine hole forming and anchor cable assembly assembling are conducted at the same time, drilling is conducted to an original pile foundation below the existing building, in the direction away from the foundation pit, the distance between the tail end of a drilled hole and the foundation pit is larger than the distance between the original pile foundation and the foundation pit, and an anchor cable assembly is put into the drilled hole; S4, grouting is conducted, pressure grouting is adopted as the grouting manner, a first expansion head is formed at the tail end of the drilled hole, and the projection of the first expansion head in the length direction of the anchor cable assembly and the projection of the original pile foundation coincide partially; and S5, the anchor cable assembly is tensioned and locked. The excavation supporting method has the effect that on the premise that foundation pit supporting is stable, the stability of a soil body below the existing building is enhanced.
Description
technical field [0001] The application relates to the technical field of excavation and support of foundation pits, in particular to a method for excavation and support of foundation pits adjacent to existing buildings. Background technique [0002] At present, different styles of support are required for the foundation pit during the construction process. The foundation pit support is to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit. The support and reinforcement adopted for the side wall of the foundation pit and the surrounding environment and protective measures. [0003] Foundation pit excavation is divided into deep foundation pit and shallow foundation pit according to the excavation depth. According to different excavation locations, there is one type of foundation pit that needs special attention, that is, the excavation of foundation pits adjacent to existing buildings. The commonly used support m...
Claims
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Login to View More IPC IPC(8): E02D17/04E02D5/74E02D3/12
CPCE02D3/12E02D5/74E02D17/04
Inventor 沈元红孟雷王可新韩同辉
Owner 北京市地质工程有限责任公司