Green construction method of steel concrete key pin occlusion row pile integral outer wall (enclosure wall-basement exterior wall-load bearing-in-one) of reverse underground engineering

Abstract

The invention discloses a new technology suitable for reverse construction of a two-layer to three-layer basement outer enclosure with the excavation depth H smaller than or equal to 16 meters in the field of engineering construction. The technology adopts a mode that temporary and permanent combination and pile-wall integration are combined, a row pile wall serves as a foundation pit enclosure framework and then is upgraded into a permanent basement overall outer wall, and the permanent basement overall outer wall is combined with two temporary waterproof curtains, in the early stage of construction, sparse and loose components are used for forming a temporary enclosure framework system for retaining soil and stopping water on the outer side of the periphery of a foundation pit on a row pile wall with key pin occlusion holes in the upper half section of a pile body, after adjacent piles, embedded columns and lining laminated layer reinforcing steel bars are connected, a single-side formwork is erected on a pit facing surface, and concrete is poured for the second time, the original loose vertical row piles are connected one by one like inserting steel concrete key pins and a chain, a permanent basement outer wall which is compact, continuous, high in rigidity, good in integrity, smooth in appearance, certain in thickness, rigid and self-waterproof is formed in a coherent mode, and the reinforced concrete multifunctional integral outer wall integrating three walls (such as the enclosure wall, the basement exterior wall and the load bearing wall) are formed.

Description

technical field [0001] The invention discloses a new type of external protection structure in the field of underground engineering structure construction, which is suitable for the soft soil foundation areas in China's coastal areas such as Shanghai and the Yangtze River Delta, and particularly relates to a design and construction that are closely combined and implemented. The "reverse method construction" process is suitable for the permanent structural exterior walls of the second to third floors of the basement with an excavation depth of H≤16m. Through technological innovation and process change, it has improved the "temporary pile row enclosure wall" of the current traditional technology. To improve and upgrade, that is to adopt the new technology scheme of "combination of temporary and permanent structures, integration of piles and walls (the temporary enclosure wall in the construction phase and the permanent structural exterior wall of the basement in the use phase are ...

AI Technical Summary

Problems solved by technology

[0004] In view of the discontinuity, unconnection, poor water stop, easy leakage, low rigidity and weak integrity of the pile row components in the original traditional (sequential and reverse method) "drilling and pouring temporary pile row temporary enclosure wall" As well as the defects and deficiencies due to the positioning of "large consumables, large amounts of waste, and high cost caused by disposable components", and the fact that the underground diaphragm wall scheme is too expensive and not economical under the conditions of the second to third floors of the same project , the present invention has done following change and improvement to former traditional " row pile temporary enclosure wall ", now upgrade, new technical scheme after perfecting is described as follows:

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