Basin excavation short support supporting system and construction technology thereof

Abstract

A construction technique of basin-type excavation with short brace support system, comprising the following steps: 1) constructing a retaining structure; 2) excavating the earthwork in the middle of the foundation pit and the upper earthwork at the edge of the foundation pit, and reserving local soil on the side of the retaining structure 3) Construction columns and column piles; 4) The main structure of the middle part of the foundation pit in the early construction and the beam-slab structure at the part of the reserved soil belt, and the beam-slab structure at the part of the reserved soil belt uses columns as vertical force transmission components; 5) The beam-slab structure previously constructed at the part of the partially reserved soil zone is used as the reaction point, and the first row of steel supports and purlins are set between it and the retaining structure; 6) The partially reserved soil zone is excavated to the second row The steel support level is lower; 7) The main beam and slab structure of the lower floor at the soil belt is reserved in the construction part, and the second row of steel supports and purlins are set; 8) Repeat steps 6) and 7) to excavate to the base. The support system obtained by this construction technology can be applied to foundation pit engineering without external anchor conditions and strict deformation control requirements.

Description

technical field [0001] The invention relates to the technical field of foundation pit support, in particular to a basin type excavation short support support system and a construction process thereof. Background technique [0002] In the foundation pit engineering without external anchor conditions, the internal support technology is generally adopted. In the prior art, the general internal support support system generally consists of the following components: [0003] 1. Soil retaining structures, such as row piles, continuous walls, etc.; [0004] 2. Support structure, such as concrete support, steel pipe or section steel support, etc.; [0005] 3. Vertical force transmission devices, such as steel columns, rigid lattice columns and column piles, etc.; [0006] 4. Surrounding purlin. [0007] The construction process of the support system is generally as follows: [0008] 1. Construction of retaining structures (row piles, diaphragm walls); [0009] 2. Excavate the f...

AI Technical Summary

Problems solved by technology

[0015] 1. The support structure is generally a pair of braces on both sides of the foundation pit or a ring-shaped support in the middle of the foundation pit. When the area of ​​the foundation pit is large, a large amount of concrete or steel is needed as a temporary support or column, and the waste will be serious after the later demolition

[0016] 2. The main structure needs to be constructed after the foundation pit is excavated to the bottom as a whole, and the construction period is long

[0017] 3. When the main structure is constructed to the support level, the support replacement and support removal procedures should be carried out first, which has a great impact on the construction period

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