Blasting method for bridge cylindrical pile foundation with diameter being 0.8-1 m

A technology for cylindrical piles and bridges, used in blasting, excavation, infrastructure engineering, etc., can solve the problems of high blasting cost, poor blasting quality, and low construction efficiency.

Inactive Publication Date: 2018-05-22
NO 2 ENG CO LTD OF CCCC FIRST HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in order to solve the technical problems of poor blasting quality, high blasting cost, low construction efficiency and easy damage to pile ho

Method used

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  • Blasting method for bridge cylindrical pile foundation with diameter being 0.8-1 m
  • Blasting method for bridge cylindrical pile foundation with diameter being 0.8-1 m
  • Blasting method for bridge cylindrical pile foundation with diameter being 0.8-1 m

Examples

Experimental program
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Embodiment 1

[0028] This embodiment provides a method for blasting a cylindrical pile foundation of a bridge with a pile foundation diameter of 0.9 m, comprising the following steps:

[0029] Drilling: such as figure 1 with figure 2 As shown, a central hollow hole 1 is vertically arranged along the centerline of the cylindrical pile foundation, and the inner ring of the blast hole is formed with the centerline of the cylindrical pile foundation as the center and with a radius of 0.15m. The outer ring of the blast hole is formed as a radius, and 4 vertically arranged cut holes 2 are evenly distributed on the inner ring of the blast hole, and 9 peripheral holes 3 arranged obliquely are evenly distributed on the outer ring of the blast hole; The included angle between the central axis of the peripheral hole 3 and the vertical direction is arccot12, and the distance from the top of the peripheral hole 3 to the central hole 1 is smaller than the distance from the bottom of the peripheral hole...

Embodiment 2

[0035] This embodiment provides a method for blasting a cylindrical pile foundation of a bridge with a diameter of 1 m, comprising the following steps:

[0036] Drilling: such as figure 1 with figure 2 As shown, a central hole 1 is arranged vertically along the centerline of the cylindrical pile foundation, and the inner circle of the blast hole is formed with the centerline of the cylindrical pile foundation as the center and with a radius of 0.17m. The outer ring of the blast hole is formed as a radius, and 4 vertically arranged cut holes 2 are evenly distributed on the inner ring of the blast hole, and 9 peripheral holes 3 arranged obliquely are evenly distributed on the outer ring of the blast hole; The included angle between the central axis of the peripheral hole 3 and the vertical direction is arccot11, and the distance from the top of the peripheral hole 3 to the central hole 1 is smaller than the distance from the bottom of the peripheral hole 3 to the central hole ...

Embodiment 3

[0042] This embodiment provides a method for blasting a cylindrical pile foundation of a bridge with a pile foundation diameter of 0.8 m, comprising the following steps:

[0043] Drilling: such as figure 1 with figure 2 As shown, a central hole 1 is arranged vertically along the centerline of the cylindrical pile foundation, and the inner circle of the blast hole is formed with the centerline of the cylindrical pile foundation as the center and with a radius of 0.13m. The outer ring of the blast hole is formed as a radius, and 4 vertically arranged cut holes 2 are evenly distributed on the inner ring of the blast hole, and 9 peripheral holes 3 arranged obliquely are evenly distributed on the outer ring of the blast hole; The included angle between the central axis of the peripheral hole 3 and the vertical direction is arccot10, and the distance from the top of the peripheral hole 3 to the central hole 1 is smaller than the distance from the bottom of the peripheral hole 3 to...

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Abstract

The invention relates to a blasting method for a bridge cylindrical pile foundation with the diameter being 0.8-1 m. The blasting method includes the steps of hole drilling, explosive material charging, blast hole opening blocking and detonating. According to the step of hole drilling, a central empty hole is vertically formed along the central line of the cylindrical pile foundation, a blast holeinner circle is formed with the central line of the cylindrical pile foundation as the center and with the radius of 0.13-0.17 m, a blast hole outer circle is formed with the central line of the cylindrical pile foundation as the center and with the radius of 0.33-0.37 m, four vertical grooving holes are evenly distributed in the blast hole inner circle, and nine inclined peripheral holes are evenly distributed in the blast hole outer circle. The included angle between the central axis of the peripheral holes and the vertical direction is arccot 10-arccot 12, and the distance from the tops ofthe peripheral holes to the central empty hole is smaller than the distance from the bottoms of the peripheral holes to the central empty hole. According to the blasting method for the bridge cylindrical pile foundation with the diameter being 0.8-1 m, blasting quality is high, construction efficiency is high, blasting cost is low, damage of blasting shock and flying stones to a pile hole protective wall can be reduced,, and flying stones are prevented from damaging construction equipment.

Description

technical field [0001] The invention relates to a blasting method for a bridge cylindrical pile foundation with a pile foundation diameter of 0.8-1m, belonging to the technical field of bridge construction. Background technique [0002] Cylindrical piles are widely used in bridge engineering. Cylindrical pile foundation excavation is usually constructed by blasting method, but the existing method has poor blasting quality, high blasting cost and low construction efficiency. The blasting shock wave, blasting seismic wave and flying rocks will damage the wall of the pile hole, and the wall will collapse, fall off, crack, etc., thereby destroying the effect of the wall of the pile hole and affecting the stability of the surrounding rock of the pile hole. Damage the construction facilities and equipment near the main access road above the excavation area. Therefore, it is necessary to choose a suitable blasting method when excavating and blasting cylindrical pile holes. On the ...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04E02D17/00
CPCE02D17/00F42D1/00F42D3/04
Inventor 李响黄永亮周晨王东伟
Owner NO 2 ENG CO LTD OF CCCC FIRST HIGHWAY ENG
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