Method for treating large-particle-size block stones in hydraulic full-pile-casing rotary excavating pile construction

A treatment method and technology of full casing, which is applied in sheet pile wall, foundation structure engineering, construction, etc., can solve the problems of difficult stone removal, thick stone layer, and the casing cannot be pressed down smoothly, so as to save cost, time saving effect

Inactive Publication Date: 2020-03-06
SHANGHAI FOUND ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hole-forming technology of the hydraulic full-casing rotary excavator can effectively reduce the disturbance of pile foundation construction near the operating (under construction) subway, and has become a commonly used technical measure at present. greater difficulty
It is mainly manifested in two aspects: on the one hand, the size of the rocks is large, and the casing cannot be smoothly pressed down to the designated position; stone out

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The present invention proposes a method for processing large-sized rocks in the construction of hydraulic full-casing rotary excavation piles, which includes the following steps:

[0021] (1) When the distribution of the block rock layer is shallow and the block rock layer is not thick, use an excavator to directly remove the block stone layer in a small area, and then backfill the earthwork for pile foundation construction.

[0022] (2) When the burial depth or thickness of the block rock layer is 1m, proceed as follows:

[0023] S1. When the boulder is located at the center of the pile position, the casing is first pressed down to the elevation of the boulder layer. According to the particle size and position of the boulder, under the protection of the casing, workers are arranged to remove it manually.

[0024] S2. When the block is only partly located in the pile position, use the casing hydraulic device to squeeze the block first. When the block is located in the s...

Embodiment 2

[0029] The present invention proposes a method for processing large-sized rocks in the construction of hydraulic full-casing rotary excavation piles, which includes the following steps:

[0030] (1) When the block stone layer is shallow and not thick, use an excavator to remove the block stone layer directly in a small area, and then backfill the earthwork for pile foundation construction.

[0031] (2) When the burial depth or thickness of the block rock layer is 1.5m, proceed according to the following steps:

[0032] S1. When the boulder is located at the center of the pile position, the casing is first pressed down to the elevation of the boulder layer. According to the particle size and position of the boulder, under the protection of the casing, workers are arranged to remove it manually.

[0033] S2. When the block is only partly located in the pile position, use the casing hydraulic device to squeeze the block first. When the block is located in the silt layer, the bloc...

Embodiment 3

[0038] The present invention proposes a method for processing large-sized rocks in the construction of hydraulic full-casing rotary excavation piles, which includes the following steps:

[0039] (1) When the block stone layer is shallow and not thick, use an excavator to remove the block stone layer directly in a small area, and then backfill the earthwork for pile foundation construction.

[0040] (2) When the burial depth or thickness of the block rock layer is 2m, proceed as follows:

[0041] S1. When the boulder is located at the center of the pile position, the casing is first pressed down to the elevation of the boulder layer. According to the particle size and position of the boulder, under the protection of the casing, workers are arranged to remove it manually.

[0042] S2. When the block is only partly located in the pile position, use the casing hydraulic device to squeeze the block first. When the block is located in the silt layer, the block can be squeezed out of...

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PUM

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Abstract

The invention relates to a method for treating large-particle-size block stones in hydraulic full-pile-casing rotary excavating pile construction. The method comprises the steps that when block stonelayers are distributed shallowly and are not thick, the block stone layers are directly removed within a small range through an excavator, and then soil is backfilled for pile foundation construction;when the buried depth or thickness of the block stone layers is 1-2 m, treatment is conducted according to the following steps that when the block stones are positioned in the center of a pile position, a pile casing is pressed downwards to the elevation of the block stone layers, and workers are arranged to conduct manual removal; when only part of the block stones are positioned in the pile position, the block stones are extruded through a pile casing hydraulic device, and if the block stones cannot be extruded out of the pile position, the workers are arranged to chisel the block stones positioned in the pile position; and for the block stones with the medium and small particle sizes, a drill bit of the rotary excavator is adopted for repeated soil taking, and for the block stones withthe large particle sizes, the workers are arranged to take the block stones out of holes through a crane under protection of the pile casing. According to the method, the time is saved for project construction, the cost is saved, and the economic, reasonable and practical effects are achieved.

Description

technical field [0001] The invention relates to a method for processing large-sized rocks in pile foundation construction, in particular to a method for processing large-sized rocks in hydraulic full-casing rotary excavation pile construction. Background technique [0002] As the operating mileage of subways increases year by year, the scale of cities continues to expand. It is inevitable to carry out pile foundation construction above (or adjacent to) the operating subway line, and there are more and more technical and construction difficulties, and the difficulty of engineering construction is increasing. [0003] During the construction process, in order to avoid the uplift of the subway caused by the reduction of gravity above the subway tunnel and destroying the balance of the original stress field, the uplift piles and cover plates are used to form a portal-type anti-uplift structure. Relying on the anti-uplift piles to provide the pull-out force, the concrete slab is...

Claims

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Application Information

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IPC IPC(8): E02D13/00E02D13/08
CPCE02D13/00E02D13/08
Inventor 缪绍勇罗云峰王国庆路三平顾亚清万义
Owner SHANGHAI FOUND ENG GRP
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