Construction method of seamless structure in extra-long basement

Abstract

A seamless structural construction method of a super-long basement belongs to the technical field of building construction, and is characterized in that continuous and staggered construction is performed on the super-long basement based on divided areas and divided stages; earth cutting based on divided areas, foundation pit surface pouring based on divided areas, foundation slab pouring and external wall pouring based on divided areas and arrangement of expansion reinforcing post-cast strips among the divided areas are carried out in sequence, so that the staggered construction is carried out based on divided areas and divided stages, and the construction efficiency is effectively improved; besides, an expansion joint is arranged between every two adjacent bottom surface layers of the basement, and each of the post-cast strips is arranged between every two adjacent foundation slabs of the basement, a high adaptability to expansion and contraction due to temperature changes is achieved, the seamless construction can be carried out, and the construction quality can be effectively improved; methylcellulose is added into nonshrink concrete, the hydration rate is reduced, the heat generation rate is reduced; aluminum nitride powder and quartz powder are added into concrete, the heat release is accelerated, the temperature rise is reduced, and the contraction is reduced.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a super-long basement seamless structure construction method. Background technique [0002] At present, the large-scale construction of high-rise buildings in our country, especially in the field of transportation construction, and the construction of cross-river and cross-river tunnels have caused more and more attention to the problem of underwater ultra-long underground structures. The engineering problems reflected in it are mainly the seamless construction of super-long underground structures. In order to maintain the integrity of the structure and the impermeability of the basement structure, the post-cast strip method is generally used as a temporary deformation joint left in the cast-in-place overall reinforced concrete structure; after the main structure is completed and the settlement is basically stable, micro Expansive concrete closes the post-cast stri...

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Problems solved by technology

[0003] However, in the actual construction of ultra-long basement structures, due to the influence of different construction periods, waterproof grades, large cross-sections, large volumes, and construction techniques, buildings are prone to harmful concrete cracks caused by temperature and shrinkage during the construction phase, which is serious. Affected the construction quality

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