Supporting-retaining protection structure for underground continuous side wall not subjected to trough excavation, and construction method thereof

Abstract

The invention discloses a construction method for supporting-retaining protection for an underground continuous side wall not subjected to trough excavation. The construction method comprises the following steps: (1), measuring the position of the underground side wall of a foundation pit, and the position of reinforced concrete supporting piles; (2), constructing the reinforced concrete supporting piles and crown beams, and embedding steel pipes in the crown beams at intervals; (3), forming a mesh-hanging and guniting layer on the sidewall of the foundation pit; (4), drilling anchor cable holes, placing anchor cables and then conducting grouting to achieve a design strength level; (5), arranging a strip-shaped steel plate, and fixing anchor heads; (6) forming a cement mortar screeding layer and a waterproof coiled material layer; (7), embedding the steel plate; (8), binding reinforced meshes on the sidewall of the foundation pit, arranging a formwork, arranging a sub-keel at the outer side of the formwork, arranging support members on the sub-keel, welding diagonal bracing I-shaped steel between the support members and the steel plate, and arranging a main-keel structure; and (9) carrying out opposite-pull fixation by virtue of fasteners and steel pipes, and carrying out casting construction to form a vertical-surface concrete layer at one side of the foundation pit.

Description

technical field [0001] The invention relates to the field of building construction, and specifically designs an underground continuous side wall support and protection structure excavated without a fertilizer tank and a construction method thereof. Background technique [0002] For the construction of conventional underground continuous side walls of buildings, the excavation is usually carried out by expanding 1.5-2.0m from the foundation of the wall as a construction fertilizer tank, so as to support the formwork and build scaffolding outside the foundation pit. When grading or soil nailing is adopted When the wall is supported, the excavation range above the pit bottom must be enlarged. Due to the enlargement of the excavation construction, the amount of excavated earthwork will increase. At the same time, it will be backfilled after construction, and the project cost will also increase; The thickness of the backfill in the excavation range is large, and it is difficult t...

AI Technical Summary

Problems solved by technology

[0002] For the construction of conventional underground continuous side walls of buildings, the excavation is usually carried out by expanding 1.5-2.0m from the foundation of the wall as a construction fertilizer tank, so as to support the formwork and build scaffolding outside the foundation pit. When grading or soil nailing is adopted When the wall is supported, the excavation range above the pit bottom must be enlarged. Due to the enlargement of the excavation construction, the amount of excavated earthwork will increase. At the same time, it will be backfilled after construction, and the project cost will also increase; The thickness of the backfill in the excavation range is large, and it is difficult to ensure the quality of the backfill due to operational restrictions. Uneven settlement and deformation quality accidents often occur around the foundation pit; some sites are limited by the environment and it is difficult to expand the excavation of the foundation pit outward; conventional pile anchors The anchor head of the support construction adopts I-beam as the waist beam, which also invades the space of the foundation pit

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