Small-section tunnel straight hole slotting blasting construction method
By adopting a double-layer honeycomb structure design in the construction of straight hole grooves in small section tunnels, the problems of direct hole groove construction efficiency and uneconomical material use in the existing technology are solved, and efficient and economical blasting effect is achieved, which maximizes the The tunnel is infiltrated and the amount of explosives is reduced.
Patent Information
- Application Number
- CN202411421301.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2024-12-31
AI Technical Summary
The existing straight hole groove design is difficult to ensure the efficient and good results of small-section tunnel blasting construction, especially in terms of economical growth ruler and material use.
The double-layer honeycomb structure design is adopted, in which the first slot hole and the second slot hole are arranged in a regular hexagonal shape around the center, the hollow hole is a hollow hole, and the second slot hole is charged, and the detonation order is first to detonate the first slot The hole is then exploded, and the second slot hole is used to achieve stable maximum damage effect and save materials using a regular hexagonal honeycomb structure.
Through the double-layer honeycomb structure design, the economy and efficiency of the construction of straight hole groove-excavation and blasting of small-section tunnels is achieved, the circulation is maximized, the use of explosives is reduced, and the economy and effectiveness of construction is improved.
Smart Images
Figure CN119223120A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a small-section tunnel straight hole slotting blasting construction method, which is applicable to the field of tunnel blasting excavation construction. Background Art
[0002] Small-section tunnels (3-10 m2) and medium-section tunnels (10-50 m2) are widely used, such as single-line highway / railway tunnels, urban subway tunnels, and water conservancy and hydropower engineering tunnels. The types of cuts include wedge cuts, straight hole cuts, and stepped cuts.
[0003] Wedge-shaped slotting has angle requirements for the slotting hole, and it is difficult to achieve long advances in small-section tunnel applications; the multi-step slotting process makes it difficult to achieve efficient construction; straight hole slotting is the blasting construction method most likely to achieve high efficiency and long advances, but the existing straight hole slotting design is difficult to guarantee a good blasting effect. Summary of the invention
[0004] The technical problem to be solved by the present invention is: in view of the above existing problems, a small-section tunnel straight hole cutting blasting construction method is provided.
[0005] The technical solution adopted by the present invention is: a small-section tunnel straight hole slot blasting construction method, characterized by comprising:
[0006] A first slotted hole, a hollow hole and a second slotted hole are arranged on the tunnel face, wherein the first slotted hole is arranged at the center of the tunnel face; there are a plurality of hollow holes, which are arranged in a regular hexagon around the first slotted hole; there are a plurality of second slotted holes, which are arranged in a regular hexagon around the regular hexagon formed by the hollow holes;
[0007] The first and second slot holes are filled with explosives, and the detonation sequence is to detonate the first slot hole first and then the second slot hole.
[0008] The regular hexagon formed by the hollow hole and the regular hexagon formed by the second groove hole are arranged at a 60° offset.
[0009] The number of the hollow holes is 6, which are arranged corresponding to the corners of a regular hexagon.
[0010] The distance between the hollow holes and adjacent hollow holes is 25 cm.
[0011] There are six second cutout holes, which are arranged corresponding to the corners of a regular hexagon.
[0012] The distance between the second cutout hole and the adjacent second cutout hole is 52 cm.
[0013] The first slotted hole has a depth of 3.5 m and a diameter of 42 mm; the hollow hole has a depth of 3.5 m and a diameter of 42 mm, and is an empty hole; the second slotted hole has a depth of 3.5 m and a diameter of 42 mm.
[0014] The electronic delay detonation of the first slot hole is 10ms; the electronic delay detonation of the second slot hole is 60ms.
[0015] The beneficial effects of the present invention are as follows: in the present invention, a plurality of hollow holes are arranged into a regular hexagon with the first groove hole as the center, and a plurality of second groove holes are arranged into a regular hexagon around the first groove hole as the center, and the honeycomb structure (regular hexagon) is utilized to ensure stability while saving materials in the most efficient manner. The present invention can achieve the maximum destabilizing effect in the most economical way by adopting the regular hexagonal honeycomb structure groove, thereby obtaining the best cycle footage.
[0016] The regular hexagon formed by the hollow hole and the regular hexagon formed by the second groove hole are staggered by 60 degrees, and a double-layer honeycomb structure is formed. The hollow hole is an empty hole without explosives, which reduces the use of explosives and has high economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a design drawing for straight hole slotting blasting of a small-section tunnel in the embodiment (double-layer honeycomb structure is arranged at staggered angles, taking a 3m×3m tunnel section as an example).
[0018] 1. The first slot hole; 2. The hollow hole; 3. The second slot hole; 4. The main blast hole; 5. The bottom plate hole; 6. The light blast hole. DETAILED DESCRIPTION
[0019] This embodiment is a small-section tunnel straight hole slot blasting construction method, which specifically includes the following contents:
[0020] S1. Set 1 first slot hole, 6 hollow holes, 6 second slot holes, 10 main blast holes, 5 bottom plate holes and 18 smooth blast holes on the tunnel face.
[0021] In this embodiment, the first slot hole is arranged at the center of the tunnel face. The first slot hole has a depth of 3.5m and a hole diameter of 42mm. The charging parameters are determined according to the on-site blasting test.
[0022] In this embodiment, the six hollow holes are arranged with the first slotted hole as the center, and are arranged in a regular hexagon, and the six hollow holes are arranged corresponding to the corners of the regular hexagon. The hollow holes have a hole spacing of 25 cm, a hole depth of 3.5 m, a hole diameter of 42 mm, no charge, and are empty holes.
[0023] In this embodiment, the six second slot holes are arranged with the first slot hole as the center, and are arranged in a regular hexagon, and the six second slot holes are arranged corresponding to the corners of the regular hexagon. The second slot holes have a hole spacing of 52 cm, a hole depth of 3.5 m, and a hole diameter of 42 mm. The charging parameters are determined according to the on-site blasting test.
[0024] In this embodiment, the regular hexagon formed by the hollow hole and the regular hexagon formed by the second groove hole are staggered by 60 degrees.
[0025] The following table is a table of blasting parameters for small-section tunnel straight hole excavation (taking 3m×3m as an example). In the actual construction process, the blasting parameters should be determined based on the section size and geological conditions after field tests.
[0026] Small section straight hole slotting blasting parameter table
[0027]
[0028] S2. Blasting is carried out in the following order: first slot hole, second slot hole, main blast hole, bottom plate hole and smooth blast hole.
[0029] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A small-section tunnel straight hole blasting construction method, characterized in that: include: A first slot hole, a hollow hole and a second slot hole are arranged on the tunnel face, wherein the first slot hole is arranged at the center of the tunnel face; There are a plurality of hollow holes, which are arranged in a regular hexagon around the first slotted hole; there are a plurality of second slotted holes, which are arranged in a regular hexagon around the regular hexagon formed by the hollow holes; The first and second slot holes are filled with explosives, and the detonation sequence is to detonate the first slot hole first and then the second slot hole.
2. The method for blasting a small-section tunnel straight hole according to claim 1 is characterized in that: The regular hexagon formed by the hollow hole and the regular hexagon formed by the second groove hole are staggered by 60 degrees.
3. The method for blasting a straight hole in a small-section tunnel according to claim 1 or 2, characterized in that: The number of the hollow holes is 6, which are arranged corresponding to the corners of a regular hexagon.
4. The method for blasting a small-section tunnel straight hole according to claim 3 is characterized in that: The distance between the hollow holes and adjacent hollow holes is 25 cm.
5. The small-section tunnel straight hole blasting construction method according to claim 1 or 2, characterized in that: There are six second cutout holes, which are arranged corresponding to the corners of a regular hexagon.
6. The method for blasting a small-section tunnel straight hole according to claim 5, characterized in that: The distance between the second cutout hole and the adjacent second cutout hole is 52 cm.
7. The small-section tunnel straight hole blasting construction method according to claim 1 or 2, characterized in that: The first slotted hole has a depth of 3.5 m and a diameter of 42 mm; the hollow hole has a depth of 3.5 m and a diameter of 42 mm, and is an empty hole; the second slotted hole has a depth of 3.5 m and a diameter of 42 mm.
8. The small-section tunnel straight hole blasting construction method according to claim 1 or 2, characterized in that: The electronic delay detonation of the first slot hole is 10ms; the electronic delay detonation of the second slot hole is 60ms.