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Support method adopting steel pipe pile grouting combined with waist beams and anchor rods

A bolt support and steel pipe pile technology, which is applied in the field of support engineering, can solve the problems of large construction noise, difficulty in forming holes, and stuck drill, and meet the requirements of energy saving and environmental protection, good anchoring and reinforcement, and process simple effect

Inactive Publication Date: 2020-04-10
CHINA RAILWAY 14TH CONSTR BUREAU GRP 4TH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This support method has disadvantages such as high construction noise, difficult and easy handling of mud, easy hole collapse, drill sticking, drill drop, difficulty in forming holes, and long construction period during prestressed anchor construction.

Method used

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  • Support method adopting steel pipe pile grouting combined with waist beams and anchor rods
  • Support method adopting steel pipe pile grouting combined with waist beams and anchor rods
  • Support method adopting steel pipe pile grouting combined with waist beams and anchor rods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] For a project on a plot, the foundation form is raft foundation + independent foundation + strip foundation, the structure type is frame-core tube, a public building of the first class, with a total construction area of ​​188,000m 2 , with a total height of 106m. The length of the foundation pit is about 201m, the width is about 101m, the maximum excavation depth is about 18.5m, and the area of ​​the foundation pit is 21827m 2 , the average depth of the foundation pit is 17m.

[0048] The area of ​​the foundation pit of this project is large, the soil quality of the side slope of the foundation pit is loose, the slope is small, and the on-site construction site is small, and it is impossible to excavate with a large slope. , The stability of the foundation pit slope is greatly enhanced, and the labor cost and material cost are effectively saved, which has achieved good economic and social benefits for the company.

[0049] The support of the foundation pit adopts the ...

Embodiment 2

[0067] For a project on a plot, the foundation form is raft foundation + independent foundation + strip foundation, the structure type is frame-core tube, a public building of the first class, with a total construction area of ​​86,000m 2 , with a total height of 136.2m. .The length of the foundation pit is about 127m, the width is about 101m, the excavation depth is about 9.7m, and the area of ​​the foundation pit is 12827m 2 , the average depth of the foundation pit is 10m.

[0068] The backfilling of the upper part of the east side of the foundation pit is the block stone during the excavation process of the foundation pit, with a maximum particle size of about 1.2m and a content of about 60%, filled with cohesive soil; the upper part of the west part of the north side of about 5.1m is all backfilling of mixed filling soil (Miscellaneous fill is the block stone during the excavation of the foundation pit, with a maximum particle size of about 1.2m and a content of about 70...

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Abstract

The invention relates to the technical field of support engineering, in particular to a support method adopting steel pipe pile grouting combined with waist beams and anchor rods. According to the method, the foundation pit support adopts a steel pipe pile plus waist beam plus self-drilling anchor rod support form; steel pipe piles and pile top contact beams are firstly constructed before a foundation pit is excavated, a vertical soft soil layer is made to form a whole, the self-drilling anchor rods are then implemented in the excavation process, anchorages of the self-drilling anchor rods aredirectly fixed to the waist beam structure, the anchor rods and the waist beams jointly bear the load of the reinforcement structure, and the anchor rods are connected through the waist beams, so that the anchoring force of the anchor rods is transmitted to a slope body, the stress state of the slope body is changed, the self-stability capability of the slope body is improved, the phi-8 steel barmesh piece plus C 20 concrete is hung on the slope surface for closing, and drainage holes are formed in the slope surface in the quincunx form at the intervals of 2-3 m. The soil retaining structurewith large thickness and good rigidity is formed, a traditional row pile and continuous wall soil retaining structure is replaced, and the process is relatively simple.

Description

technical field [0001] The invention relates to the technical field of support engineering, specifically, a steel pipe pile grouting combined with waist beam bolt support method, the support method is suitable for complex geological conditions, loose and broken soil Anchor bolt construction is easy to collapse the hole, but it is difficult to form a deep foundation pit slope support project. Background technique [0002] At present, for complex geological conditions, loose and broken soil and deep foundation pit slopes that are difficult to form holes, the support method is bored pile + prestressed anchor support, bored pile + prestressed anchor through the enclosure The beams form a binary retaining envelope. The support system controls the deformation of the foundation pit through the overall stiffness. On the one hand, the bored pile is used to retain the soil; on the other hand, the force borne by the support structure is transmitted to the stable stratum through the p...

Claims

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Application Information

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IPC IPC(8): E02D17/04E02D5/76E02D3/10
CPCE02D3/10E02D5/76E02D17/04E02D2300/002E02D2300/0029
Inventor 李树敬
Owner CHINA RAILWAY 14TH CONSTR BUREAU GRP 4TH ENG