Construction method of underground deep foundation concrete by reverse formworks
A construction method and concrete technology, which can be used in infrastructure engineering, excavation, construction, etc., can solve the problems of not being able to withstand lateral pressure, collapse, deformation, etc., and achieve the effect of reliable quality and prevention of quicksand and soil collapse.
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[0036] Example 1
[0037] The inverse form construction method of underground deep foundation concrete of the present invention is characterized by comprising the following steps:
[0038] a. Construction supporting pile
[0039] The foundation is positioned and laid out according to the coordinate size of the drawing, and then concrete supporting piles are constructed close to the periphery of the foundation so that the margin is 300-500mm. The concrete supporting piles are concrete cast-in-place piles or concrete continuous retaining walls.
[0040] b. Excavation of foundation pit supports inverse formwork, which includes the following steps:
[0041] (1) Excavate the foundation pit when the supporting pile reaches the curing strength;
[0042] (2) Excavation to the elevation of the foundation pit bottom;
[0043] (3) Precise positioning and laying out of the foundation on the cushion;
[0044] (4) Set up anti-mould according to pay-off support;
[0045] Among them: when the buried depth ...
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[0050] Example 2
[0051] figure 2 This is a schematic diagram of another support method of the reverse mold according to the embodiment of the present invention. The support method of the reverse mold uses a scaffold steel pipe to support the formwork: wooden squares, scaffold pipes, fasteners, etc. are used to build a support system on the inner side of the foundation. example 1.
[0052] The inverse formwork construction method of underground deep foundation concrete of the present invention is widely used in Shougang Qiangang No. 2 cold rolling zone 4 and 6 oriented silicon steel project. There are more than 40 underground cable tunnels in this project, and the depth of foundation pits are all between -5m and -7m. Between the vertical and horizontal intertwining, the compact layout, and the densely distributed equipment foundation, the foundation pit is narrow and has no formwork operation space; the civil construction stage is catching up with the rare rainstorm period in the...
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