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Construction method for large-diameter pile foundation of deep sand layer in karst development area

A construction method and large-diameter technology, applied in infrastructure engineering, drilling equipment and methods, excavation, etc., can solve the problems of poor construction efficiency, high safety risk, slow construction progress, etc., to achieve high construction efficiency and avoid corresponding costs. , to avoid the effect of orifice collapse

Pending Publication Date: 2022-08-02
THE SECOND ENG OF THE THIRD ENG GROUP OF CHINA RAILWAY +1
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Problems solved by technology

[0003] The invention provides a construction method for large-diameter pile foundations with deep sand layers in karst-developed areas, which is used to solve the problem of collapsed holes or holes when drilling with traditional drilling rigs when thicker sand layers, large-scale karst caves and beaded karst caves exist in the formation. The phenomenon of grout leakage is extremely serious, the construction progress is slow, the construction effect is poor, and there are high safety risks

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  • Construction method for large-diameter pile foundation of deep sand layer in karst development area
  • Construction method for large-diameter pile foundation of deep sand layer in karst development area
  • Construction method for large-diameter pile foundation of deep sand layer in karst development area

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[0041] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

[0042] The invention discloses a construction method for a large-diameter pile foundation in a deep sand layer in a karst developed area. figure 1 As shown in the figure, the construction method has been applied in the deep sand layer, karst development and adjacent existing line sections of Guangzhou Baiyun Station No. 1, and the technology has been summarized.

[0043]Guangzhou Baiyun Station No. 1 is located in Baiyun District, Guangzhou City, Guangdong Province. The starting and ending mileage of the Liuxi River Bridge is GXLDK11+537.91~GXLDK13+237.035, with a length of 1.699 kilometers, of which the 49#-55# piers have relatively developed geological karsts. By using the fu...

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Abstract

The invention discloses a large-diameter pile foundation construction method for a deep sand layer in a karst development area. The method comprises the following steps that S1, a site is leveled, and a pile placing position is measured; s2, reinforcing the earth surface; s3, placing a base plate; s4, the drilling machine is in-place and centered; s5, the casing pipe is hoisted and placed; s6, a sleeve is pressed in, the perpendicularity is measured again, and a grab bucket takes soil to form a hole; s7, a reinforcement cage is hoisted and placed; s8, a guide pipe is installed; s9, concrete is poured, and the pipe is pulled out gradually; and S10, pile foundation detection and pile forming quality detection. According to the large-diameter pile foundation construction method, the phenomenon of hole collapse or slurry leakage during construction of thick sand layers, large karst caves and bead-like karst caves in stratums is avoided, the construction progress is fast, the construction effect is excellent, meanwhile, the high safety coefficient is achieved, and the large-diameter pile foundation construction method is suitable for the technical field of road and bridge building construction.

Description

technical field [0001] The invention belongs to the technical field of road and bridge building construction, and in particular relates to a construction method for large-diameter pile foundations in deep sand layers in karst developed areas. Background technique [0002] There are various ways to form holes for bridge pile foundations. Generally, the type of drilling rig is selected according to the geological conditions, design pile length, pile diameter and construction conditions, taking into account the construction period, economic cost and other influencing factors. Among them, in the geological conditions such as clay soil, gravel soil, gravel, pebbles, boulders and soft and hard rock layers, it is most common to use traditional methods such as rotary drilling, impact drilling, and rotary drilling to construct pile foundations. However, when there are thick sand layers, large karst caves and beaded karst caves in the stratum, the phenomenon of hole collapse or slurr...

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Application Information

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IPC IPC(8): E02D27/12E02D27/14E02D3/12E02D15/04E02D15/06E02D17/02E21B7/20
CPCE02D27/12E02D27/14E02D15/04E02D3/12E02D17/02E02D15/06E21B7/20
Inventor 王磊赵海波龚波信胜辉常会君王建忠樊金宇马良胡云龙宋鑫夏龙雨张新辉
Owner THE SECOND ENG OF THE THIRD ENG GROUP OF CHINA RAILWAY
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