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Pre-splitting blasting excavation construction method for middle and lower layers of diversion tunnel

A pre-split blasting and construction method technology, applied in blasting and other directions, can solve the problems of increasing falling blocks, landslides, etc., and achieve the effect of reducing trimming operations, reducing the amount of backfilling, and high flatness

Pending Publication Date: 2021-06-11
CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the vibrations generated by multiple blasts are transmitted to the surrounding rock of the cavern, which increases the risk of falling blocks and landslides.

Method used

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  • Pre-splitting blasting excavation construction method for middle and lower layers of diversion tunnel
  • Pre-splitting blasting excavation construction method for middle and lower layers of diversion tunnel
  • Pre-splitting blasting excavation construction method for middle and lower layers of diversion tunnel

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0038] In describing the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", " The orientation or positional relationship indicated by "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, so as to Specific orientation configurations and operations, therefore, are not to be construed as limitations on the invention.

[0039] A construction met...

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Abstract

The invention discloses a pre-splitting blasting excavation construction method for middle and lower layers of a diversion tunnel, and belongs to the technical field of water conservancy and hydropower engineering. The pre-splitting blasting excavation construction method for the middle and lower layers of the diversion tunnel comprises the following steps of excavation of a pore-forming platform, design of pre-splitting holes, charging of the pre-splitting holes, connection, blasting of the pre-splitting holes, design of main blasting holes, charging of the main blasting holes, connection and blasting of the main blasting holes. According to the method, pre-splitting blasting is conducted on the vertical hole of the lower half cave, detonation on the two sides is controlled, the hole body rock mass is separated from the surrounding rock parent body, the flatness of the separation face is high, the forming quality is excellent, trimming operation is reduced, hole body over-excavation is well controlled, the backfill amount of permanent lining concrete is reduced, the engineering cost is reduced, and the lining construction operation time is shortened. The project progress is accelerated.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a construction method for excavating by pre-splitting blasting in the middle and lower layers of a diversion tunnel. Background technique [0002] Diversion tunnel refers to a tunnel used for construction diversion purposes. At present, in the construction of water conservancy and hydropower projects, due to the large section of the diversion tunnel, layered excavation is required. For the excavation method of the upper half of the hole, the conventional excavation method is adopted, and the construction can be carried out normally by pushing inward. [0003] However, the traditional method adopted for the excavation of the side wall of the lower half of the hole is to open a slot in the middle first, and then excavate the side wall by smooth blasting. [0004] Because it is difficult to control the overcut and undercut caused by the horizon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D3/04
CPCF42D1/00F42D3/04Y02E10/20
Inventor 陈雪湘曹小杰朱晓峰
Owner CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD
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