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Construction method of permanent retaining system characterized by joint work of basement floor slabs and retaining piles

A permanent support and construction method technology, applied in excavation, infrastructure engineering, construction, etc., can solve problems such as disconnection, waste of building materials and social resources, and achieve the effects of reducing horizontal stress, improving force characteristics, and protecting the environment

Active Publication Date: 2015-09-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the field of deep foundation pit engineering, the pile-anchor foundation pit support structure based on bored piles is one of the main forms of temporary foundation pit support, which causes a great waste of building materials and social resources
In traditional design thinking, foundation pit engineering is a temporary construction measure, and the design of the main structure is often ahead of the design of the foundation pit support structure, resulting in a disconnect between the two in the design process

Method used

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  • Construction method of permanent retaining system characterized by joint work of basement floor slabs and retaining piles
  • Construction method of permanent retaining system characterized by joint work of basement floor slabs and retaining piles
  • Construction method of permanent retaining system characterized by joint work of basement floor slabs and retaining piles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] figure 1 As shown, during the excavation of the foundation pit and the construction of the underground structure, the foundation pit support adopts the pile-anchor support system.

[0044] figure 2 As shown, the first permanent outrigger is the outrigger 4 of the foundation raft, which is located in the plane of the foundation raft 8 and is supported by plain concrete.

[0045] The supporting system includes concrete bored piles 1, crown beams 2, main structure outriggers 3, foundation raft outriggers 4, gravel sand layer 5, basement exterior wall 6, basement floor slab 7, and foundation raft slab 8 , base cushion 9, backfill soil 10, waist beam 11, basement exterior wall waterproof layer 12, basement exterior wall insulation layer 13, and embedded parts 14.

[0046] figure 2 As shown, the supports other than the first outrigger are located in the floor plane of the corresponding height. They are the outrigger supports of the main structure and belong to reinforced...

Embodiment 2

[0058] The construction process of the permanent support system in which the basement floor slab and support piles work together includes the following steps:

[0059] (1) perform bored pile 1;

[0060] (2) Excavation of foundation pit and installation of bolts;

[0061] (3) Apply foundation cushion 9 and foundation raft 8;

[0062] (4) A permanent plain concrete support is set between the foundation raft 8 and the support pile 1, that is, the outreach support 4 of the foundation raft. For the construction waste in the empty slots between the guard piles, lay a 200mm thick plain concrete cushion, backfill the sand layer 5 with well-graded crushed stones, and pour plain concrete horizontal support not less than 500mm thick in the plane of the raft, the first layer The outrigger construction is completed;

[0063] (5) The first anchor cable is dismantled and recovered: after the foundation raft outrigger 4 reaches 80% of the design strength, remove and recover the first ancho...

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Abstract

The invention provides a construction method of a permanent retaining system characterized by joint work of basement floor slabs and retaining piles. The system comprises foundation pit retaining piles and members depending on a basement floor slab structure, such as horizontal outward-extending supports and middle beams. The retaining piles are anchored by using pre-stressed anchor cables in the foundation pit excavation stage. In the basement construction stage, the permanent outward-extending supports are arranged to replace anchor rods to bear the horizontal working force of the retaining piles. The retaining structure system and the body structure can function together permanently. The invention provides a novel underground space retaining system; a temporary foundation pit retaining structure can be changed into a permanent underground retaining structure; the properties of materials can be fully utilized; the construction costs can be reduced; and underground environments can be protected.

Description

technical field [0001] The invention belongs to the field of industrial and civil building foundations, in particular to a construction method for a permanent support system in which basement floor slabs and support piles work together. Background technique [0002] In the field of deep foundation pit engineering, the pile-anchor foundation pit support structure based on bored piles is one of the main forms of temporary foundation pit support, which causes a great waste of building materials and social resources. In traditional design thinking, foundation pit engineering is a temporary construction measure, and the design of the main structure is often ahead of the design of the foundation pit support structure, resulting in a disconnect between the two in the design process. The permanent foundation pit support system based on bored piles combines the underground part of the main structure with concrete support piles with the help of permanent outstretched supports to form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04
Inventor 李连祥符庆宏王兴政鲁芬婷张永磊李先军刘兵邴鹏
Owner SHANDONG UNIV
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