Blasting method for bridge cylindrical pile base with pile base diameter of 1.7-1.9 m

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

Inactive Publication Date: 2018-05-15
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 base with pile base diameter of 1.7-1.9 m
  • Blasting method for bridge cylindrical pile base with pile base diameter of 1.7-1.9 m
  • Blasting method for bridge cylindrical pile base with pile base diameter of 1.7-1.9 m

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Embodiment 1

[0028] This embodiment provides a method for blasting a bridge cylindrical pile foundation with a pile foundation diameter of 1.8 m, which includes the following steps:

[0029] Drilling: such as figure 1 with figure 2 As shown, a central hollow 1 is arranged vertically along the centerline of the cylindrical pile foundation, with the centerline of the cylindrical pile foundation as the center and a radius of 0.15m to form a blast hole inner circle, and the centerline of the cylindrical pile foundation is centered on 0.45m. The middle circle of the blast hole is formed as the radius, and the outer circle of the blast hole is formed with the center line of the cylindrical pile as the center and the radius of 0.8 m. The inner circle of the blast hole is evenly distributed with 4 vertically arranged cut holes 2. There are 6 vertically arranged auxiliary holes 3 evenly distributed on the middle ring of the blast hole, 14 obliquely arranged peripheral holes 4 are evenly distributed on...

Embodiment 2

[0036] This embodiment provides a method for blasting a bridge cylindrical pile foundation with a pile foundation diameter of 1.9 m, which includes the following steps:

[0037] Drilling: such as figure 1 with figure 2 As shown, a central hollow 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 and the radius of 0.17m, and the centerline of the cylindrical pile foundation is 0.37m. The middle circle of the blast hole is formed as the radius, and the outer circle of the blast hole is formed with the center line of the cylindrical pile as the center and the radius of 0.67 m. The inner circle of the blast hole is evenly distributed with 4 vertically arranged cut holes 2. There are 6 vertically arranged auxiliary holes 3 evenly distributed on the middle ring of the blast hole, 14 obliquely arranged peripheral holes 4 are evenly distributed on the out...

Embodiment 3

[0043] This embodiment provides a method for blasting a bridge cylindrical pile foundation with a pile foundation diameter of 1.7 m, which includes the following steps:

[0044] Drilling: such as figure 1 with figure 2 As shown, a central hollow 1 is arranged vertically along the centerline of the cylindrical pile foundation, with the centerline of the cylindrical pile foundation as the center and a radius of 0.13m to form a blast hole inner circle, and the centerline of the cylindrical pile foundation is centered on 0.43m. The middle circle of the blast hole is formed as the radius, and the outer circle of the blast hole is formed with the center line of the cylindrical pile as the center and the radius of 0.78 m. The inner circle of the blast hole is evenly distributed with 4 vertically arranged cut holes 2. There are 6 vertically arranged auxiliary holes 3 evenly distributed on the middle ring of the blast hole, 14 obliquely arranged peripheral holes 4 are evenly distributed o...

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Abstract

The invention relates to a blasting method for a bridge cylindrical pile base with the pile base diameter of 1.7-1.9 m. The blasting method includes the steps of drilling holes, loading explosive materials, blocking a cannon opening and triggering blasting. According to a hole drilling method, a central hole is vertically formed along a central line of the cylindrical pile base, a cannon opening inner ring with a radius of 0.13-0.17 m is formed with the central line of the cylindrical pile base as the center, a cannon opening middle ring with a radius of 0.43-0.47 m is formed, a cannon openingouter ring with a radius of 0.78-0.82 m is formed, and 4 vertically formed cutting holes are evenly distributed in the cannon opening inner ring, 6 vertically formed auxiliary holes are evenly distributed in the cannon opening middle ring, and 14 obliquely formed peripherical holes are evenly distributed in the cannon opening outer ring; the included angle between the central axis of each peripherical hole and the vertical direction is arccot10-arccot12, and the distance between the top of each peripherical hole and the central hole is smaller than that between the bottom of each periphericalhole and the central hole. The blasting quality is high, the construction efficiency is high, and the blasting cost is low.

Description

Technical field [0001] The invention relates to a method for blasting a bridge cylindrical pile foundation with a pile foundation diameter of 1.7-1.9 m, and belongs to the technical field of bridge construction. Background technique [0002] Cylindrical piles are widely used in bridge engineering. The excavation of cylindrical piles is usually constructed by blasting. However, the existing methods have poor blasting quality, high blasting costs, and low construction efficiency. If the excavation and blasting of cylindrical piles are improper, Blasting shock waves, blasting seismic waves and flying rocks will cause damage to the pile hole protection wall, causing the protection wall to collapse, fall off, and crack, which will destroy the pile hole protection effect and affect the stability of the pile hole surrounding rock. The resulting flying rocks may also Damage the construction facilities and equipment near the main access road above the excavation area. Therefore, appropri...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04
CPCF42D1/00F42D3/04
Inventor 黄永亮周晨邢海龙
Owner NO 2 ENG CO LTD OF CCCC FIRST HIGHWAY ENG
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