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Construction method for processing ultra-thick quicksand layer of pile foundation by using front-end vibration steel casing

A construction method and technology of steel casings, which are applied in foundation structure engineering, sheet pile walls, buildings, etc., can solve the problems of easily damaged stratum structures and low construction efficiency, and achieve high construction efficiency, convenient installation and dismantling, and lower requirements Effect

Active Publication Date: 2012-10-03
CCCC FOURTH HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The well point precipitation method is easy to damage the stratum structure, and the construction efficiency is low

Method used

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  • Construction method for processing ultra-thick quicksand layer of pile foundation by using front-end vibration steel casing
  • Construction method for processing ultra-thick quicksand layer of pile foundation by using front-end vibration steel casing
  • Construction method for processing ultra-thick quicksand layer of pile foundation by using front-end vibration steel casing

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Embodiment Construction

[0031] figure 1 It is a construction flow chart of the construction method of the front-end vibrating steel casing of the present invention for processing the ultra-thick quicksand layer of the pile foundation, including the following steps:

[0032] (1) Make vibrating steel casing: select a steel casing whose inner diameter is more than 6cm larger than the designed pile diameter, and weld a steel partition along the axial direction of the steel casing inside the steel casing, the plane of the steel partition and the steel casing The axes are parallel; the center of the steel partition is located on the axis of the steel casing;

[0033] (2) Excavate the non-quick sand layer above the quicksand layer according to the usual manual hole-digging pile construction method, and pour a section of retaining wall on the inner wall of the pile hole every time a certain depth is excavated. After pouring the retaining wall, the inner diameter of the pile hole is larger than the designed p...

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Abstract

The invention discloses a construction method for processing an ultra-thick quicksand layer of a pile foundation by using a front-end vibration steel casing. The construction method comprises the following steps of: pre-manufacturing a front-end vibration sinking steel casing, and welding a steel clapboard in the steel casing along the axial direction of the steel casing, wherein the plane of the steel clapboard is parallel to the axial line of the steel casing; after manually digging holes to the quicksand layer, installing and sinking the steel casing in the pile hole in a vibrating manner; and, after sinking the steel casing in a mudstone layer below the quicksand layer in a vibrating manner, stopping tunnelling while manually digging at the position which is 30 cm away from the bottom of the steel casing, implanting a ring of steel bars, each of which is 100 cm in length, in the remained quicksand layer and the mudstone layer at the lower part of the quicksand layer along the edge of the casing, then, continuously and downwardly tunnelling the mudstone layer below the quicksand layer in 30 cm, and pouring a waterproof reinforced concrete protective wall which is 60 cm in height and 4 cm in thickness. The construction method disclosed by the invention is capable of rapidly and efficiently passing through the quicksand layer in the event of not influencing ground construction fields and not damaging stratum structures; furthermore, the construction method has the advantages of low cost and high safety.

Description

technical field [0001] The invention belongs to the field of bridge pile foundation construction, and relates to a method for digging holes for pile foundations, in particular to a method for digging holes under geological conditions with an ultra-thick quicksand layer. Background technique [0002] The quicksand layer is an unfavorable geological condition that is often encountered in the construction of pile foundations. Once the digging process is not handled properly, water seepage and hole wall collapse are prone to occur, which not only affects the construction progress, but also may cause major safety accidents. For the construction of quicksand layers containing quicksand layers, especially ultra-thick quicksand layers, methods such as high-pressure grouting treatment and well point dewatering are widely used at present. [0003] The high-pressure grouting method is to drill a hole from the ground around the pile hole to pass through the quicksand layer, and then low...

Claims

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Application Information

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IPC IPC(8): E02D7/18E02D5/38
Inventor 王昕郝明王志强王海平张占国
Owner CCCC FOURTH HIGHWAY ENG
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