Construction method for hole forming of bridge pile foundation in karst area

A construction method and pile foundation hole technology, which are applied in the fields of foundation structure engineering, sheet pile wall, soil protection, etc., can solve the problems of prone to collapse accidents, increased engineering costs, and interruption of engineering implementation, so as to prevent slurry leakage and prevent leakage. The effect of concrete loss, improving pile quality and avoiding hole collapse

Pending Publication Date: 2022-07-29
CHINA 19TH METALLURGICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two main reasons: one is that the quality of piles is difficult to guarantee; the other is that hole collapse accidents are prone to occur during the construction of pile foundations, and construction safety is difficult to guarantee
Karst geology is widely distributed in our country. In these areas, it is not uncommon for bridge piles to shift due to failure to take effective treatment of karst caves during bridge construction, and it is not uncommon for bridge piles to shift. And cause safety accidents, the cost of the project will be greatly increased, the construction period will be seriously delayed, and even the implementation of the project will be interrupted.

Method used

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  • Construction method for hole forming of bridge pile foundation in karst area
  • Construction method for hole forming of bridge pile foundation in karst area
  • Construction method for hole forming of bridge pile foundation in karst area

Examples

Experimental program
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Effect test

specific Embodiment

[0051] Method 1: Full shield method

[0052] If the range of the karst cave is large and the slurry leakage is serious, once the slurry leakage occurs, the slurry level in the hole drops rapidly, and the mud retaining wall cannot resist the pressure generated by the difference between the internal and external water heads generated during the slurry leakage. Wait for vicious accidents to occur, and the most effective way to prevent this is to use full casing construction. In the actual construction, the protective tube follow-up method is adopted.

[0053] Follow-up construction of the casing, that is, first place the casing according to the conventional method, after the drilling rig is in place to drill to a certain depth, remove the drilling rig, and then vibrate and sink the casing. Repeat this until the casing follows up to the bedrock surface. .

[0054] 1), hoist the steel casing

[0055] After the rotary drilling rig drills to the rock surface and is accepted, hoist...

Embodiment 1

[0064] The bridge measurement and stakeout are controlled by the first-level wire. The plane pile position staking is carried out with a total station according to the center coordinates of the pile position that have been calculated and checked. After setting out the central pile position of the pile foundation, you can place the instrument on different control points to check and review, or use a large steel ruler to measure whether the distance between adjacent pile positions is correct. The construction team shall bury the guard piles 2 according to the site technical setting out pile positions. The bored pile 3 here is the pile foundation hole 1 before pouring.

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Abstract

The invention discloses a construction method, particularly discloses a construction method for hole forming of a bridge pile foundation in a karst area, and belongs to the technical field of building engineering structure building processes. According to the construction method for hole forming of the bridge pile foundation in the karst area, the pile forming quality can be effectively improved, and hole collapse accidents are avoided in the construction process. The construction method comprises the following steps: firstly, classifying karst caves in a pore-forming area according to data information obtained by surveying; and according to different types of the karst caves, a full pile casing method, a static grouting method or a covering layer grouting consolidation method is adopted for the pile foundation holes in the corresponding karst cave areas to complete consolidation of foundations around the pile foundation holes in the karst cave areas and construction work of hole forming of the pile foundation holes in the karst cave areas.

Description

technical field [0001] The invention relates to a construction method, in particular to a construction method for forming holes for bridge pile foundations in karst areas, and belongs to the technical field of construction engineering structures. Background technique [0002] At present, it is more common to build bridges in karst areas in China, and karst areas were once called "forbidden areas" for bridge construction. There are two main reasons: one is that the quality of the piles is difficult to guarantee; the other is that the pile foundation construction process is prone to collapse accidents, and construction safety is difficult to guarantee. Karst geology is widely distributed in my country. In these areas, it is not uncommon for the bridge piles to be displaced due to the failure to take effective treatment of the karst cave during the construction of bridge engineering. The resulting safety accidents have greatly increased the cost of the project, severely delayed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/66E02D3/12
CPCE02D5/665E02D3/12
Inventor 李栋栋陈亚军刘帅
Owner CHINA 19TH METALLURGICAL CORP
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