Construction method for changing steel pipe supports of ramp foundation pit

Abstract

The invention discloses a construction method for changing steel pipe supports of a ramp foundation pit. The construction method comprises the following steps of: 1, punching a support pile in the periphery of a ramp in a length direction, connecting an inner support system to the inner side of the support pile, then excavating the foundation pit; 2, paving a bottom plate of the ramp in the foundation pit and constructing a ramp inner wall and a ramp outer wall on two sides of the bottom plate of the ramp; 3, constructing a boundary beam on the inner side of the ramp outer wall, sequentially pre-embedding a plurality of pre-embedded steel plates at intervals; 4, connecting additionally-embedded steel plates arranged in one-to-one correspondence with the pre-embedded steel plates to the inner side of the ramp inner wall; 5, connecting a steel pipe support between each pre-embedded steel plate and the corresponding additionally-embedded steel plate; 6, refilling backfill and paving a plain concrete transfer slab band between the support pile and the ramp outer wall; 7, dismantling the inner support system; and 8, pouring concrete of the ramp inner wall and the ramp outer wall, concrete of a ramp top plate beam and concrete of a ramp top plate. By adopting the method, a support changing system is balanced and stable in stress and has enough strength.

Description

technical field [0001] The invention relates to a construction method for replacing braces in foundation pits, in particular to a construction method for replacing braces with steel pipe braces in foundation pits on ramps. Background technique [0002] In the deep foundation construction of high-rise buildings, the foundation pit support project has a long construction period and high cost, which is the key stage of the whole project. There are many design forms of foundation pit support, but limited by the location of the project and geological conditions, there are often few economical and applicable support forms. At present, the concrete internal support system has been more and more used in deep foundation pit support projects because of its low requirements on the surrounding environment and convenient construction. Demolition is an inevitable process. In the construction of the car ramp in the basement, it is necessary to carry out special support technology constru...

AI Technical Summary

Problems solved by technology

[0006] Although the first and second patents have a series of advantages, they cannot solve a series of problems in the construction of the basement car ramp, such as the construction of the ramp replacement technology, so as to remove the inner support of the foundation pit, and then carry out the subsequent ramp construction to ensure the ramp. construction safety

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