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Rotary spraying construction method for improving ductility of pile foundation of operating subway station

A construction method and technology for subway stations, applied to foundation structure engineering, sheet pile walls, underground chambers, etc., can solve the problems of difficult compensation of bearing capacity and high risk, and achieve the effect of low investment cost, simple steps and convenient realization

Active Publication Date: 2022-01-18
CHINA TIESIJU CIVIL ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to meet the above-mentioned requirements with the existing construction technology, that is, it is difficult to compensate the bearing capacity lost after the partial pile foundation is cut off by using methods such as MJS reinforcement, and the risk is high

Method used

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  • Rotary spraying construction method for improving ductility of pile foundation of operating subway station
  • Rotary spraying construction method for improving ductility of pile foundation of operating subway station
  • Rotary spraying construction method for improving ductility of pile foundation of operating subway station

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Experimental program
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Effect test

Embodiment approach

[0034] (1) Determine the height and size of the shield section. Determine the position and height where the shield machine will pass through the pile foundation, determine the construction hole circle on the side wall of the shield receiving shaft, and pre-embed the square steel pipe for the guide pipe in advance. In this example, the square steel pipe with a height of 18m and a side length of 0.25m.

[0035] (2) Set up equipment. The target pile foundation that needs to be reinforced is reinforced layer by layer. After the first layer of reinforcement position is determined, the rear supporting device is fixed in the shield receiving well, and the debugging work starts after the preparation of the front drill bit is completed.

[0036] (3) Excavation and excavation. After the equipment debugging is completed, the first section of excavation and cutting will start. Two adjacent cutting crawler belts 9 rotate in the opposite direction, and the soil body can be cut and brought...

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Abstract

The invention discloses a rotary spraying construction method for improving ductility of a pile foundation of an operating subway station. The method comprises the following steps: (1) determining the height and the size of a shield section; (2) erecting equipment; (3) tunneling and excavating; (4) stirring and transporting the soil body; (5) rotary excavation; (6) reinforcing the pile body; (7) grouting; and (8) similarly, for a stand column pile with a certain length, the device is moved upwards by a working height, and the steps (3)-(7) are repeated for layered and step-by-step reinforcement at different heights, so that the whole reinforcing process of the cut-off pile foundation is achieved. The ductility of the underground cut pile foundation can be effectively improved, the bearing capacity is improved, and the method is simple, easy to implement, convenient to operate, low in manufacturing cost and short in construction period.

Description

technical field [0001] The invention relates to the relevant fields of subway tunnels and underground engineering, in particular to a rotary spraying construction method for increasing the ductility of pile foundations of operating subway stations. Background technique [0002] When crossing the floor of an existing station, if the pile foundation spacing of the underground structure of the existing station is insufficient, the pile foundation needs to be truncated to allow enough space to pass through the shield tunnel, and the truncated pile foundation usually loses part of its bearing capacity. When the truncated part of the pile foundation is too long and loses too much bearing capacity, it is very likely to affect the normal use of the existing operating stations. At present, MJS and other reinforcement methods are usually used to reinforce the area between the existing operating station and the construction site, so as to reduce the disturbance caused by the truncated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/06E21D9/12E21D11/10E02D5/64E02D31/00
CPCE21D9/06E21D9/12E21D11/105E02D5/64E02D31/00Y02A30/30
Inventor 李安赵良云赵宏伟张红磊李斌斌王栋莫林飞李超张佳文
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD
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