Construction method for miniature steel pipe concrete pile to penetrate through roadbed layer for reinforcing soft foundation construction

A technology for steel pipe concrete piles and weak foundations, which is applied in foundation structure engineering, sheet pile walls, earthwork drilling and mining, etc., can solve the problems that the construction cannot be carried out and cannot meet the requirements of foundation strength, etc. It is easy to master, and the construction equipment is small and convenient. The effect of flexibility and flexible pile layout

Active Publication Date: 2014-07-16
CHINA RAILWAY 12TH BUREAU GRP +1
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Problems solved by technology

[0004] The present invention is to solve the problem that the traditional soft foundation treatment method cannot meet the requirements of engineering construction for the strength of the foundation, and the construction cannot be carried out, and provides a construction method of micro-steel concrete piles penetrating the road base to reinforce the weak foundation

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  • Construction method for miniature steel pipe concrete pile to penetrate through roadbed layer for reinforcing soft foundation construction

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with specific examples.

[0035]After the abutment and subgrade transition section of a super-large bridge were laid and entered the joint commissioning and joint test, it was found through settlement observation that the post-construction settlement could not meet the design requirements, and the abutment and subgrade transition section needed to be reinforced. Because there is a certain thickness of concrete near the abutment foundation, and the construction site is narrow, the prestressed pipe pile reinforcement measures cannot be implemented according to the design. It is decided to use micro-concrete-filled steel pipe piles for reinforcement treatment. 16 rows of micro-concrete-filled steel-filled piles are arranged horizontally along the subgrade surface, with a horizontal spacing of 0.7m, and 2 rows of micro-filled steel-filled concrete piles are arranged vertically, with a longitudinal spacing o...

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Abstract

The invention discloses a construction method for a miniature steel pipe concrete pile to penetrate through a roadbed layer for reinforcing the soft foundation construction and belongs to the technical field of engineering construction. The construction method solves the problems that the traditional soft foundation treatment mode cannot meet the requirements of the engineering construction on the foundation intensity, and the construction cannot be carried out. The construction method comprises the following steps of carrying out pipe following operation by a down-hole hammer eccentric drilling rig; forming holes by a geological drilling rig; sinking pipes by a hydraulic vibration hammer; pulling out tube protecting sleeves; pre-burying grouting pipelines; placing a steel reinforcement cage; filling high-intensity mixed materials for forming piles; and grouting around the piles for forming a compound foundation. The construction method has the advantages that the construction is convenient, the equipment is small and flexible, the construction field requirements are low, safety and reliability are realized, the penetrating capability is high, and the construction period is short.

Description

technical field [0001] The invention belongs to the technical field of engineering construction, and relates to a construction method for reinforcing weak foundations with miniature steel pipe concrete piles under the condition that the subgrade body is filled and the concrete layer is covered thereunder. Background technique [0002] With the continuous development of engineering construction in our country, a large number of weak foundation reinforcement treatment has appeared in engineering projects, and has become a major problem that must be solved in engineering projects. Traditional deep soft foundation treatment includes high-pressure jet grouting piles, mixing piles, CFG piles, driven piles, etc. [0003] However, in the reinforcement treatment of weak foundations in various engineering construction projects, especially where the geological conditions are complex, close to existing structures, the road base body is filled and the concrete layer is covered, and the c...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/38E02D11/00E02D5/62E02D15/04E21B4/16
Inventor 司敏建王淼章陈少连姜学勇
Owner CHINA RAILWAY 12TH BUREAU GRP
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