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Large-diameter drilled pile construction method

A construction method and technology of bored piles, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problem that the construction method is difficult to meet the construction requirements of large-diameter bored piles, the stability of the main tower of the bridge is difficult to be further guaranteed, and the construction progress Slow and other problems, to achieve a good forming effect, increase the free surface of the rock formation, and ensure the quality of the effect

Inactive Publication Date: 2018-02-16
SHANGHAI CIVIL ENG GRP FIFTH
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Problems solved by technology

In the pile foundation construction of the main tower of the bridge, in order to ensure the stability of the main tower, it is often necessary to use a large-diameter bored pile with a large bearing capacity, that is, a bored pile with a diameter greater than 2.5 meters. In the construction of large-diameter bored piles, there are problems such as construction difficulties, slow construction progress, construction methods that cannot meet the construction requirements of large-diameter bored piles, and furthermore, it is difficult to further ensure the stability of the main tower of the bridge.

Method used

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  • Large-diameter drilled pile construction method

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Embodiment

[0024] A construction method for large-diameter bored piles, comprising the steps of:

[0025] (1) Drilling platform erection: After the steel cofferdam of the main pier is installed, the drilling platform is erected on the steel cofferdam of the main pier;

[0026] (2) Steel casing construction:

[0027] 1) Design of the steel casing: the bottom elevation of the steel casing is -9.0~-9.5m (rock surface elevation), the top elevation of the steel casing is 11.5~12.5m (50cm higher than the top surface of the construction platform), the steel casing The total length is 21-21.5m; the design pile diameter of the pile foundation is According to the provisions of 8.4.1 of "Technical Specifications for Construction of Highway Bridges and Culverts JTG / T F50-2011":

[0028] d≥(D / 2+h×i+d’)×2

[0029] Where: D = design pile diameter (m)

[0030] H = length of steel casing (m)

[0031] i = Casing installation inclination rate (%), and the maximum shall not exceed 0.03m

[0032] d = ...

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Abstract

The invention discloses a large-diameter drilled pile construction method. The large-diameter drilled pile construction method comprises the following steps: (1) a drilling platform is built; (2) a steel protection cylinder is constructed; the top surface of the steel protection cylinder is higher than the top surface of the drilling platform by 50 cm; (3) a down-hole drill is used for construction; 28-30 small holes are drilled in the pile foundation plane range; gaps between the small holes are controlled within 35-40 cm; and the drilling depth is above the pile bottom elevation by 30 cm; (4) finished holes are constructed; (5) the holes are cleaned through reverse circulation, so that the residue thicknesses at the bottoms of the finished holes are lower than 5 cm, the mud weights in the holes are 1.03-1.1, and the sand contents are not higher than 2%; (6) a reinforcement cage is placed; and (7) concrete is poured. The large-diameter drilled pile construction method can overcome theconstruction difficulties of high-strength rock layers, improves the quality of drilled piles, and guarantees the stability of a bridge main tower.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method for large-diameter bored piles. Background technique [0002] Bored piles are usually made by using a drilling rig to form pile holes in the foundation of the engineering site, and placing steel cages and pouring concrete in the pile holes. In the pile foundation construction of the main tower of the bridge, in order to ensure the stability of the main tower, it is often necessary to use a large-diameter bored pile with a large bearing capacity, that is, a bored pile with a diameter greater than 2.5 meters. The construction of large-diameter bored piles has problems such as construction difficulties, slow construction progress, construction methods that cannot meet the construction requirements of large-diameter bored piles, and the stability of the main tower of the bridge is difficult to further guarantee. Contents of the invention [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/38
CPCE02D5/38E02D2250/0023
Inventor 黄忠睦吴宇张利军覃晶耿庆生朱淑兰李斌张恺
Owner SHANGHAI CIVIL ENG GRP FIFTH
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