Pre-bored hole static blasting and manual pile digging auxiliary construction method for hard-rock stratum

A static blasting and construction method technology, applied in excavation, sheet pile wall, foundation structure engineering and other directions, can solve the problems of undetermined blasting range, affecting the uniformity of pile diameter, waste of concrete in the pile body, etc. The effect of improving the side friction resistance of the pile and saving the cost

Inactive Publication Date: 2020-09-25
SANMING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above method has the following problems: in hard rock formations, if blasting and other methods are not used to assist construction, manual excavation is slow and affects work efficiency; if blasting with explosives is used, on the one hand, it will affect the environmental vibration, and on the other hand, it is difficult to determine the blasting range. , affecting the uniformity of the pile diameter, resulting in waste of pile concrete

Method used

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  • Pre-bored hole static blasting and manual pile digging auxiliary construction method for hard-rock stratum
  • Pre-bored hole static blasting and manual pile digging auxiliary construction method for hard-rock stratum

Examples

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Effect test

Embodiment 1

[0019] See Figure 1-2 This embodiment provides a technical solution: a pre-drilled static blasting auxiliary construction method for man-digging piles in hard rock formations, including the following steps:

[0020] S1. Drill a plurality of pre-drill holes along the depth direction of the pile holes 2 within the radial range of the pre-designed pile holes 2 on the hard rock stratum 4, inject expansive cement into the pre-drill holes 3, and then inject water and seal the pre-drill holes. Drilling 3. The diameter of the pre-drilled hole 3 is 20 mm and the length is 50 cm. The plurality of pre-drilled holes 3 includes first drilled holes evenly distributed around the center of the pile hole 2, and a plurality of second drilled holes distributed in a matrix, equilateral triangle or isosceles triangle between the plurality of first drilled holes. Two drilling holes.

[0021] S2. After the hard rock is expanded and cracked under the action of the expansion force of the expansive ceme...

Embodiment 2

[0031] This embodiment provides a technical solution: a pre-drilled static blasting auxiliary construction method for human-excavated piles in hard rock formations, including the following steps:

[0032] S1. Drill a plurality of pre-drill holes 3 along the depth direction of the pile holes 2 within the radial range of the pre-designed pile holes 2 on the hard rock stratum 4, inject expanded cement into the pre-drill holes 3, and then inject water. The diameter of the pre-drilled hole 3 is 80mm and the length is 150cm. The plurality of pre-drilled holes 3 includes first drilled holes evenly distributed around the center of the pile hole 2, and a plurality of second drilled holes distributed in a matrix, equilateral triangle or isosceles triangle between the plurality of first drilled holes. Two drilling holes.

[0033] S2. After the hard rock is expanded and cracked under the action of the expansion force of the expansive cement, the pile hole 2 is excavated in the hard rock strat...

Embodiment 3

[0037] This embodiment provides a technical solution: a pre-drilled static blasting auxiliary construction method for human-excavated piles in hard rock formations, including the following steps:

[0038] S1. Drill a plurality of pre-drill holes 3 along the depth direction of the pile holes 2 within the radial range of the pre-designed pile holes 2 on the hard rock stratum 4, inject expanded cement into the pre-drill holes 3, and then inject water. The diameter of the pre-drilled hole 3 is 80mm and the length is 150cm. The plurality of pre-drilled holes 3 includes first drilled holes evenly distributed around the center of the pile hole 2, and a plurality of second drilled holes distributed in a matrix, equilateral triangle or isosceles triangle between the plurality of first drilled holes. Two drilling holes.

[0039] S2. After the hard rock is expanded and cracked under the action of the expansion force of the expansive cement, the pile hole 2 is excavated in the hard rock strat...

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Abstract

The invention is applicable to the technical field of manual pile digging construction, and provides a pre-bored hole static blasting and manual pile digging auxiliary construction method for a hard-rock stratum. A plurality of pre-bored holes are bored in the depth direction of a pile hole in the radial range of the pre-designed pile hole in the hard-rock stratum, expansion cement is injected into the pre-bored holes, the pre-bored holes are then injected with water and closed, and after the hard rock is expanded and cracked under the action of the expansion force of the expansion cement, thepile hole is excavated in the hard-rock stratum in the crack depth range to form a pile hole section. A pre-bored hole static blasting method is adopted, the influence on the environment is small, the blasting range is easy to determine, the diameter uniformity and the pile length of a pile body can be better guaranteed, improvement of the pile-side friction resistance and the single-pile bearingcapacity is facilitated, the single-pile bearing capacity and the overall settlement uniformity are ensured, and the construction cost is saved.

Description

Technical field [0001] The invention belongs to the technical field of manual pile digging construction, and in particular relates to an auxiliary construction method for pre-drilling static blasting of human digging piles in hard rock formations. Background technique [0002] At present, large-diameter piles are generally constructed by manual digging method. The general construction process of this method is to dig down 1-1.5m, and support the formwork to pour the retaining wall concrete. After the retaining wall concrete reaches a certain strength, the next step is to excavate. In this way, only to the design pile length position, and then hoist the steel cage and pour concrete. But construction in hard rock formations. [0003] However, the above methods have the following problems: In hard rock formations, if blasting is not used for auxiliary construction, manual excavation is slow, which affects work efficiency; if explosives are used for blasting, on the one hand, it has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/06E02D17/08E02D5/36
CPCE02D5/36E02D17/06E02D17/08E02D2250/0023
Inventor 张会芝刘纪峰杨悦陈孝国付晓强杨淼严孝彩
Owner SANMING UNIV
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