Deep foundation pit outer wall integrated structure and construction method

Abstract

The invention discloses a construction method for a deep foundation pit outer wall integrated structure. The construction method comprises the following steps that retaining wall constructional columns are replaced with socket type steel columns, a retaining wall is built on the outer side of a basement outer wall by using two layers of prefabricated brick tire membranes, a waterproof roll is paved between the two layers of prefabricated brick tire membrane retaining walls, opposite-pulling connecting pieces can be pre-embedded in the inner-layer prefabricated brick blank film retaining wall to fix the formwork, an enclosing wall for pouring the outer wall is formed, and therefore the space for pouring the outer wall is formed. According to the construction method, firstly, the situation that the construction amount is increased due to the fact that inclined struts are arranged before outer wall pouring can be avoided, the stability, pressure resistance and perpendicularity of the prefabricated brick forming die wall are enhanced through the steel columns, meanwhile, the number of the socket type steel columns is small, the distance between the supporting structure and the socket type steel columns is not limited by the small construction space any more when the distance is adjusted, and the distance between the supporting structure and the socket type steel columns can be adjusted to be less than 0.8 m; secondly, constructional columns such as the steel columns are flexible to assemble and disassemble, and the construction amount is greatly reduced; and thirdly, the construction method greatly reduces the dependence on the outer side space of the outer wall, so that the construction amount is greatly reduced. According to the construction method, the construction period can be greatly shortened, and the foundation pit design can be more flexible and more economical.

Description

technical field [0001] The invention relates to the field of construction of external walls of deep foundation pits, in particular to an integrated structure and construction method of external walls of deep foundation pits. Background technique [0002] In order to meet the basic requirements of workers’ working space in the construction of traditional deep foundation pit basement exterior walls, the space reserved between the side walls of the supporting piles and the exterior walls of the basement needs to be at least 1.2 meters away from the working surface according to the actual depth of the foundation pit, so as to barely meet the requirements of the exterior walls. The basic requirements for the working space of formwork installation and removal, exterior wall waterproofing and protective layer construction, scaffolding erection, etc. The erection of formwork brackets in the traditional construction process is as follows: figure 2 As shown, the outer wall edge line i...

AI Technical Summary

Problems solved by technology

If it is limited by the site or there is a deviation during the construction of the side wall support pile, the working space will be reduced, and in the actual construction process, the actual reserved working surface is often much smaller than the design reserved working surface, so at this time The construction conditions are extremely unfavorable to the construction of the above-mentioned existing exterior wall construction methods, and ultimately have a great negative impact on project quality and construction safety.

[0004]On the other hand, during the construction of the existing exterior walls, first, the space reserved between the support piles and the exterior walls of the basement is too large, which will directly result in the amount of earth excavation 1. The amount of backfill increases, thereby increasing the construction cost; second, there are many processes, and the overlapping of the front and rear processes is affected by the narrow space, resulting in low work efficiency, which has an adverse impact on basement construction

[0005] To solve the above problems, such as Fig. 3, CN109736353B has announced the construction method of compound type unilateral formwork deep foundation pit basement exterior wall, but there are following problems in this method: 1. prefabricated protective wall section, prefabricated protective wall lower section It is necessary to use adjustable pull-joints to connect with the enclosure structure to maintain the verticality of the prefabricated protective wall. Since the side of the prefabricated protective wall facing away from the enclosure structure needs to be equipped with a waterproof structure, in order to prevent the waterproof structure from being partially sealed, The adjustment structure of the adjustable pull connector can only be set on the side of the prefabricated protective wall facing the enclosure structure. The distance between the prefabricated protective wall and the enclosure structure must be controlled at 1.2 meters so that workers can enter the gap for construction. The number of adjustable pull-connectors set is large to maintain the verticality of the entire prefabricated protective wall. Therefore, the project volume is huge and the operating space is narrow. Lack of spacious escape channels, so it is resisted by workers and is not the first choice; 2. The side of the waterproof structure facing away from the enclosure structure needs to be protected by a sandwich wall. Due to the weak strength of the waterproof structure, it is difficult to pull it through the connecting piece The formwork of the sandwich wall is poured to prevent the formwork from collapsing. Therefore, in this plan, diagonal braces are supported on the side of the formwork facing away from the waterproof structure. Pre-embedding the tension connectors in the prefabricated protective wall will destroy the waterproof effect of the waterproof structure

Based on the above reasons, CN109736353B is only used as a technology on paper, but in reality, the construction is too difficult and often not adopted, but a more traditional construction method is adopted

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