Blasting method for bridge cylindrical pile foundation with pile foundation diameter of 1.1-1.3m

A technology for cylindrical piles and bridges, which is applied in the field of blasting of cylindrical pile foundations of bridges, can solve the problems of low construction efficiency, high blasting cost, and easily damaged pile hole retaining walls.

Inactive Publication Date: 2018-05-29
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 easily damaged pile hol

Method used

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  • Blasting method for bridge cylindrical pile foundation with pile foundation diameter of 1.1-1.3m
  • Blasting method for bridge cylindrical pile foundation with pile foundation diameter of 1.1-1.3m
  • Blasting method for bridge cylindrical pile foundation with pile foundation diameter of 1.1-1.3m

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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 1.2 m, comprising the following steps:

[0029] Drilling: such as figure 1 and 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 10 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 pile foundation diameter of 1.3 m, comprising the following steps:

[0036] Drilling: such as figure 1 and 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 0.17m. 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 10 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...

Embodiment 3

[0042] This embodiment provides a method for blasting a cylindrical pile foundation of a bridge with a pile foundation diameter of 1.1 m, comprising the following steps:

[0043] Drilling: such as figure 1 and figure 2 As shown, a central hole 1 is vertically arranged 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 10 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 a pile foundation diameter of 1.1-1.3m. The blasting method comprises the steps of drilling, filling explosives, blocking a blast hole and detonating, wherein the drilling step comprises the following steps of: vertically forming a central bull hole along a central line of the cylindrical pile foundation, forming a blast hole inner ring with a radius of 0.13-0.17m by taking the central line of the cylindrical pile foundation as a center, forming a blast hole outer ring with a radius of 0.48-0.52m by takingthe center line of the cylindrical pile foundation as the center, uniformly distributing four slotting holes which are vertically distributed in the blast hole inner ring, and uniformly distributing10 peripheral holes which are formed in an inclined mode in the blast hole outer ring, wherein included angles between the center axes of the peripheral holes and the vertical direction are arccot10-arccot12, and distances from the hole tops of the peripheral holes to the hollow bull hole are smaller than those from the hole bottoms of the peripheral holes to the hollow bull hole. The blasting method is high in blasting quality, is high in construction efficiency, is low in blasting cost, further can alleviate damages, on a pile hole protective wall, of blasting vibrations and flying rocks, and prevents the flying rocks 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 1.1-1.3m, 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 th...

Claims

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Application Information

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IPC IPC(8): F42D1/08F42D1/00F42D3/04
CPCF42D1/00F42D1/08F42D3/04
Inventor 邢海龙李响周晨黄永亮
Owner NO 2 ENG CO LTD OF CCCC FIRST HIGHWAY ENG
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