一种硬岩隧道爆破炮孔布置结构
By employing a layout structure of open blast holes, cut holes, and edge dense hole curtain in hard rock tunnels, combined with a specific cut unit layout, the problem of unsatisfactory blasting effect caused by the lack of systematic blast hole layout was solved, and the uniformity of rock crushing and construction safety were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHAN ENGINEERING CO LTD OF CHINA RAILWAY SEVENTH GROUP
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-17
AI Technical Summary
The existing blast hole layout structure for hard rock tunnel blasting lacks systematicness and specificity, resulting in unsatisfactory blasting effects, ineffective concentration of blasting energy, uneven rock fragmentation, safety hazards, and high construction costs.
The arrangement of air blast holes, cut holes, and edge dense hole curtain is adopted. The air blast holes and cut holes are distributed at equal intervals radially along the tunnel face, while the edge dense hole curtain is distributed in an arc along the tunnel boundary line. Combined with the layout of triangular and quadrilateral cut units, the systematic distribution and uniform transmission of blasting energy are ensured.
This resulted in more uniform rock crushing, reduced rock residue, decreased impact on surrounding buildings and facilities, improved construction safety and efficiency, and reduced construction costs.
Smart Images
Figure CN224517566U_ABST
Abstract
Claims
1. A blast hole arrangement structure for hard rock tunnels, comprising: The tunnel boundary line (4) is the boundary of blasting in hard rock tunnels. The tunnel boundary line (4) is set at the edge of the tunnel face (5) and is the tunnel cross section. The features are: the tunnel face (5) has blast holes (1), slotting holes (2) and edge dense hole curtain (3), and the edge dense hole curtain (3) is distributed in an arc shape along the tunnel boundary line (4), which is a continuous dense drilling structure. The blast holes (1) and slotting holes (2) are located inside the edge dense hole curtain (3). The slotting holes (2) and the air blasting holes (1) are distributed in the tunnel face (5) area inside the edge dense hole curtain (3), and the air blasting holes (1) and the slotting holes (2) are distributed at equal intervals along the radial direction of the tunnel face (5), with a half-circle of slotting holes (2) for storing explosives distributed between adjacent air blasting holes (1).
2. A hard rock tunnel blast hole arrangement according to claim 1, characterized in that: The blast holes (1), slotting holes (2), and edge dense hole curtain (3) are all arranged perpendicular to the tunnel face (5).
3. A hard rock tunnel blast hole arrangement according to claim 1, characterized in that: The inner diameter of the blast hole (1) is smaller than the inner diameter of the slotted hole (2), and the inner diameter of the blast hole (1) is larger than the inner diameter of the edge dense hole curtain (3).
4. A hard rock tunnel blast hole arrangement according to claim 1, characterized in that: The edge dense hole curtain (3) is a group of aggregated hole grooves formed by drilling.
5. A hard rock tunnel blast hole arrangement according to claim 1, characterized in that: The surface of the tunnel face (5) has two types of slotting units, and the two types of slotting units include a first slotting unit and a second slotting unit.
6. A hard rock tunnel blast hole arrangement according to claim 5, characterised in that: The first slotting unit is arranged in a triangular pattern, with one slotting hole (2) as the center and three empty blasting holes (1) located at the vertices of the triangle, and the empty blasting holes (1) are distributed around the slotting hole (2).
7. A hard rock tunnel blast hole arrangement according to claim 5, characterized in that: The second slotting unit is arranged in a quadrilateral shape, with one slotting hole (2) as the center and four empty blasting holes (1) located at the vertices of the quadrilateral, and the empty blasting holes (1) are distributed around the slotting hole (2).