Method for carrying out cast-in-situ bored pile construction by means of travel revolution borer

A technology of bored piles and construction methods, which is applied in sheet pile walls, foundation structure engineering, construction, etc., can solve problems such as difficulties in stable drilling and positioning, and achieve clean and tidy construction sites, fast drilling speed, and accurate and convenient positioning Effect

Inactive Publication Date: 2009-11-25
LONGJIAN ROAD & BRIDGE
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a construction method for bored piles using a walking rotary drilling rig, which is used to solve the problem of difficulty in drilling stability and positioning in existing construction methods

Method used

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Examples

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Effect test

Embodiment 1

[0023] To make pier piles, the bridge is 375 meters long and requires 40 piles. The upper part of the soil layer is river sandy soil deposits, and the lower part is fully weathered and weakly weathered mudstone. 6m-31m is silt and fine sand layer; 31m-36.5m sand and pebble layer, particle size 10mm-200mm, content 30%-40%; 36.5m-40m is strong weathered mudstone; 40m- 48 meters is slightly weathered mudstone interbedded with siltstone.

[0024] Adopt the present invention to carry out bored pile construction method as follows,

[0025] 1. Embedding of casing

[0026] Manual excavation of the lower casing, after the casing is dug, the lower edge of the casing is pressed into the clay layer with an excavator, and the gap between the casing and the pit wall is compacted with clay to prevent the casing from sinking during the drilling process.

[0027] 2. Prepare high-quality mud

[0028] Use a mud mixer to prepare clay, caustic soda, and CMC fibers to a density of 1.15-1.25 g / cm...

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PUM

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Abstract

The invention relates to a method for carrying out cast-in-situ bored pile construction by means of a travel revolution borer. The prior cast-in-situ bored pile normal/reverse circulation borer needs to be adjusted continuously in all directions during cast-in-situ bored pile construction; therefore, the stable boring speed completely depends on the construction experience of a driver; moreover, stable boring often takes longer time or is difficult to be adjusted in place under the condition of complex terrain; meanwhile, the construction method has difficulties in meeting the requirements of large pile diameter and long pile body, the positioning deviation is large and the pile position is inaccurate caused by difficult stable boring positioning. The method radically solves the problems and comprises the following steps: burying a protective barrel; preparing high-quality slurry; carrying out boring by the travel revolution borer; filling concrete; and finally, filling the prepared spare slurry in a hole bored by the borer. The method is used to solve the problem that the prior construction method is difficult to realize stable boring positioning.

Description

1. Technical field: [0001] The invention relates to a construction method for bored cast-in-place piles by using a walking rotary control drilling rig. 2. Background technology: [0002] At present, the bored piles are drilled with positive and reverse circulation drilling rigs. During construction, continuous debugging is required in all directions, and the steady drilling speed depends entirely on the construction experience of the driver. When encountering complex terrain, it often takes a long time to stabilize drilling or it is difficult to get in place. Due to the difficulty in the positioning of steady drilling, large positioning deviations and inaccurate pile positions are often caused. At the same time, this construction method is difficult to adapt to the requirements of large pile diameter and long pile body. 3. Contents of the invention: [0003] The object of the present invention is to provide a construction method for bored piles using a walking rotary dril...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/34E02D5/38
Inventor 杨再宇
Owner LONGJIAN ROAD & BRIDGE
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