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A Contour Blasting Method Used in Rock Foundation Excavation

A profile and rock foundation technology, applied in blasting and other directions, can solve problems such as damage and loosening of columnar joints that are difficult to apply, and achieve the effects of reducing the amount of charge in a single hole, prolonging the action time, and improving the flatness.

Active Publication Date: 2017-06-27
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main method to control the excavation quality of rock foundations is to use contour blasting technology, but conventional contour blasting technology is difficult to apply to rock masses prone to damage and loosening such as columnar joints

Method used

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  • A Contour Blasting Method Used in Rock Foundation Excavation
  • A Contour Blasting Method Used in Rock Foundation Excavation
  • A Contour Blasting Method Used in Rock Foundation Excavation

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figure 2-4 Shown, a kind of outline blasting method that the present invention is used for rock foundation excavation comprises the following steps:

[0025] 1. Drilling blast holes: According to blasting design requirements, drill main blast holes, buffer holes and contour blast holes in the blast area to be excavated. After the drilling is completed, do a good job of hole inspection. After passing the inspection, the next step can be done .

[0026] 2. Charging: The charging of the main blasting hole and the buffer hole is the same as the conventional method. The charging of the contour blasting hole bundles the explosives with the detonating cord with bamboo chips and PVC plastic plates as supports, and distributes them evenly along the detonating cord. , the length of the detonating cord is the same as the length of the explo...

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Abstract

The invention discloses a contour blasting method for rock foundation excavation, which is suitable for blasting and excavation projects in engineering fields such as water conservancy and hydropower, railways, and urban construction. The plugging material with higher bonding strength is used to strengthen the effect of the blockage of the contour blast hole, and the detonating cord does not pass through the plugging section, and the detonator is used to detonate the detonating cord and explosives in the contour hole, thereby greatly prolonging the blasting gas The action time in the hole can achieve the same excavation effect on the contour surface under the premise that the charge amount is 1 / 3~1 / 2 of the conventional charge amount; reduce the blasting vibration; reduce the damage to the retained rock mass. This method has no hole bottom reinforced charging section, which can avoid the serious local damage of the hole bottom that occurs in conventional contour blasting. The invention has the advantages of simple operation and good use effect, and can be widely used in rock foundation excavation of water conservancy and hydropower projects and urban construction projects.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a contour blasting method for rock foundation excavation, and is particularly suitable for deep hole pre-splitting blasting. Background technique [0002] The excavation quality of hydraulic building rock foundations in water conservancy and hydropower projects is directly related to the displacement and stability control of rock mass structures and hydraulic structures during the construction and operation periods, and is a key technical issue in the construction of water conservancy and hydropower projects. As the construction center of large-scale water conservancy and hydropower projects shifts to the southwestern alpine and valley areas and the construction of high dams and large reservoirs, higher requirements are placed on the quality of rock foundation excavation. At the same time, rocks that are prone to damage and loosening under bla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00F42D3/04F42D1/08
Inventor 陈明胡浩然卢文波邓珂严鹏王高辉
Owner WUHAN UNIV
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