Construction method of air shaft cast-in-situ bored pile

A technology of bored cast-in-place piles and construction methods, which is applied to sheet pile walls, infrastructure engineering, construction, etc., can solve the problem that the safety of workers cannot be effectively guaranteed, the progress and quality of construction are affected, and the main hoisting wire rope is broken. and other problems, to avoid secondary damage, improve construction efficiency, and reduce construction accidents.

Inactive Publication Date: 2020-08-14
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the different engineering geological structures in the specific construction, the construction platform is often unstable, the drilling hole collapses, the drilling tool is stuck, and the main hoisting steel rope breaks, etc., which seriously affect the construction progress and construction quality. The safety of the

Method used

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Examples

Experimental program
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Embodiment 1

[0035] A construction method for bored piles in wind wells, comprising the following steps:

[0036] ① Stakeout positioning: use the wire method to measure and place the axis with a total station to determine the pile position, the pile spacing is 950mm, and then establish a measurement control network in the site, and measure and place the center points of each pile position according to the control network. The ten" shape leads to four pile points, and the four pile points are used as single pile protection; and protective wooden piles are placed on the pile points, and the surrounding areas are cured with mortar or plain concrete; The distance between the centers is 1000mm; the concrete strength grade of the pile body is C30 concrete; the size of the protective wooden pile is 3cm×3cm×80cm, and the top of the protective wooden pile is nailed and buried 45cm underground.

[0037] ② Embedded casing: bury the casing based on the four protective wooden piles; the diameter of the...

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PUM

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Abstract

The invention discloses a construction method of an air shaft cast-in-situ bored pile. The construction method comprises the following steps of (1) setting out and positioning, (2) pile casing burying, (3) drilling machine in-place, (4) drilling hole forming, (5) primary hole cleaning, (6) hole forming detection, (7) reinforcement cage placement, (8) guide pipe lowering, (9) secondary hole cleaning and (10) concrete pouring and pile casing pulling. The water level in the hole is higher than the water level of underground water in the drilling process; after the drilling machine drills to the designed hole depth, a drill bit is lifted 300-500 mm away from the bottom of the hole, slow rotation is performed, primary hole cleaning is performed, and the time is 2-3.5 h; when pebbles or gravelswith the diameter smaller than 10 cm exist at the bottom of the hole, a reverse circulation method is adopted for hole cleaning; and when the size of pebbles or gravels existing at the bottom of the hole is larger than 10 cm, a pumping reverse circulation method is adopted for secondary cleaning in the hole. According to the construction method, the drill hole is effectively prevented from collapsing, and drilling tool clamping and burying and main winch steel rope breakage are avoided.

Description

technical field [0001] The invention belongs to the technical field of construction, and in particular relates to a construction method of bored piles for wind shafts. Background technique [0002] Bored cast-in-place pile is a technology commonly used in foundation construction. Cast-in-situ pile is a kind of pile made by pouring concrete or reinforced concrete after forming a hole in place. Commonly used methods include rotary drilling bored pile and immersed tube cast-in-place pile. and explosive expansion of cast-in-place piles. [0003] However, due to the different engineering geological structures in the specific construction, the construction platform is often unstable, the drilling hole collapses, the drilling tool is stuck, and the main hoisting steel rope breaks, etc., which seriously affect the construction progress and construction quality. security cannot be effectively guaranteed. Contents of the invention [0004] In view of this, the object of the presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/38E02D15/04
CPCE02D5/38E02D5/385E02D15/04
Inventor 孙振川李宏波翟乾智王利明王雅文潘东江赵海雷杨延栋秦银平陈桥王发民
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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