A mine pre-splitting blasting charge structure

Abstract

The utility model discloses a mine pre-splitting blasting charge structure. It includes the pre-splitting hole of incline arrangement, the support casing of arrangement in the pre-splitting hole center and the explosive of stringing in the detonating cord, the explosive of stringing in the detonating cord is from the top opening of support casing and stretches into the bottom of support casing, the top opening of support casing still has the filling material of tamping, and the electronic detonator of being located outside the pre-splitting hole is connected with the detonating cord. Its advantage lies in: through setting up the support casing in the pre-splitting hole of incline arrangement, the explosive is supported in the support casing, and it is roughly in the pre-splitting hole center position, thereby avoiding the explosive sticking on the inclined lower wall surface, and the blasting effect is greatly improved. Through setting up the support casing in the pre-splitting hole, the occurrence of the problem of pre-splitting hole collapse or the problem of charge uniformity caused by the stone sliding (if collapse, it can need to set up the pre-splitting hole in other position, causes the position deviation and influences the blasting effect) can be effectively prevented, and the certainty of the pre-splitting hole position is guaranteed.

Description

Technical Field

[0001] This utility model relates to a pre-splitting blasting charging technology, specifically a pre-splitting blasting charging structure for mines. Background Technology

[0002] Slope instability is a common problem in mining projects. It can trigger landslides and collapses, causing damage to mining equipment, interrupting production processes, and generating unpredictable indirect costs. Conventional treatment methods lack long-term effectiveness, resulting in significant long-term cost risks. National and industry policies (such as GB16423-2020 Safety Regulations for Metal and Non-metal Mines) clearly stipulate that controlled blasting technology must be used in key areas such as the final slope near the mining area. This technology precisely controls the blasting process to achieve slope smoothing, protect the rock mass structure, and ultimately form a naturally stable slope. Traditional backhoe blasting methods, due to poor slope smoothness and insufficient stability, completely fail to meet this mandatory requirement. To address this, the existing technology typically employs the method of filling the pre-splitting hole with explosives for blasting. This method is easier to control and has a significantly improved effect compared to the backhoe method, but it still has the following problems: (1) Since the pre-splitting hole is inclined, the explosives will stick to the inclined wall after being placed in the pre-splitting hole, affecting the blasting effect; (2) The pre-splitting hole is very prone to collapse, making the drilled pre-splitting hole unusable; (3) The wall of the inclined pre-splitting hole itself is not smooth, so it is subject to resistance during the loading process, making loading difficult. Therefore, how to design a new loading structure to overcome the above problems has become an urgent technical problem to be solved. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a mine pre-splitting blasting charging structure that is quick and convenient to charge, has a good blasting effect, and can effectively avoid the problem of being unable to charge due to the collapse of the pre-splitting hole.

[0004] To solve the above-mentioned technical problems, the present invention provides a mine pre-splitting blasting charge structure, including an inclined pre-splitting hole, a support sleeve placed at the center of the pre-splitting hole, and explosives connected in series on a detonating cord. The explosives connected in series on the detonating cord extend from the top opening of the support sleeve to the bottom of the support sleeve. The top opening of the support sleeve is also filled with filler material. The detonating cord is connected to an electronic detonator located outside the pre-splitting hole.

[0005] Furthermore, the support sleeve is a PVC sleeve.

[0006] Furthermore, the inclination angle of the pre-cracked hole is 50-80°.

[0007] Furthermore, the length of the support sleeve is 10-20m.

[0008] Furthermore, the diameter of the pre-cracked hole is 110-160mm, and the outer diameter of the support sleeve is 70mm.

[0009] Furthermore, the support sleeve is inserted into the bottom of the pre-cracked hole.

[0010] Furthermore, the filler material is rock powder.

[0011] Furthermore, the length of the filling material is 1.5-3m.

[0012] The advantages of this utility model are: (1) By placing a support sleeve in the inclined pre-splitting hole, the explosive is supported in the support sleeve, so that it is roughly in the center of the pre-splitting hole, thereby avoiding the explosive from sticking to the inclined lower wall surface and greatly improving the blasting effect.

[0013] (2) By installing a support sleeve in the pre-splitting hole, the problem of pre-splitting hole collapse or the problem of uniform charge caused by stone slippage can be effectively prevented (if collapse occurs, pre-splitting holes may need to be opened in other locations, causing positional shift and affecting blasting effect), thus ensuring the certainty of the pre-splitting hole position.

[0014] (3) Since the inner wall of the support sleeve is smooth, the explosive can be loaded smoothly, ensuring the convenience of operation and construction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a single pre-splitting blasting charge structure for mines according to this utility model; Figure 2 This is a schematic diagram of the pre-splitting blasting charge structure (multiple) for mines according to this utility model. Detailed Implementation

[0016] The pre-splitting blasting charge structure of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] To address the issues of uneven slopes caused by existing backhoe leveling methods and uneven charge distribution due to stone slippage in traditional charging methods, this utility model of a pre-splitting blasting charging structure for mining was designed. Targeted tests were conducted, focusing on the structure's effectiveness in preventing stone slippage, protecting borehole wall integrity, and ensuring charge continuity and stability. Experiments verified that it can indeed improve slope appearance, flatness, and stability by uniformly releasing explosive energy. Ultimately, a stable charging structure suitable for 115mm and 152mm borehole diameters was developed, overcoming the shortcomings of traditional charging methods and providing crucial support for the implementation of pre-splitting blasting technology. The specific technical solution, as shown in the figure, includes an inclined pre-splitting hole 1 and a support sleeve placed at the center of the pre-splitting hole. 2 and explosive 4 connected in series on detonating cord 3, wherein the inclination angle of the pre-splitting hole 1 is 50-80°, and generally the diameter of the pre-splitting hole 1 is 110-160mm, and the outer diameter of the support sleeve is 70mm. Preferably, the diameter of the pre-splitting hole 1 is either 115mm or 152mm. In this case, the ratio between the diameter of the pre-splitting hole 1 and the outer diameter of the support sleeve is 115 / 70 or 152 / 70. By setting the size ratio, a better blasting effect can be ensured. The explosive connected in series on the detonating cord 3 extends from the top opening of the support sleeve to the bottom of the support sleeve. The top opening of the support sleeve 2 is also filled with filling material 5, which is rock powder. The detonating cord 3 is connected to an electronic detonator 6 located outside the pre-splitting hole.

[0018] Furthermore, the depth of the pre-cracked hole is 15-20m, and the length of the supporting sleeve is approximately the same. For example, in this embodiment, the supporting sleeve 2 is a PVC sleeve, the depth of the pre-cracked hole is 16 meters, and the length of the PVC sleeve is 16 meters (four 4-meter sleeves can be spliced ​​together). The PVC sleeve is inserted into the bottom of the pre-cracked hole. Since the supporting sleeve is suspended, in order to ensure that it does not tilt or fall over, cotton cloth or sponge can be filled between the opening of the supporting sleeve and the pre-cracked hole for support.

[0019] The above structural design can improve slope quality from the source, reduce subsequent repair costs, and avoid indirect losses caused by safety accidents. It not only meets the core needs of enterprise cost control, but also provides technical reference for the industry to reduce operating costs. It is an important path to promote the efficient operation of the mining economy.

[0020] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A pre-splitting blasting charge structure for mines, characterized in that: It includes a pre-splitting hole (1) set at an angle, a support sleeve (2) placed in the center of the pre-splitting hole, and explosives (4) connected in series on a detonating cord (3). The explosives connected in series on the detonating cord (3) extend from the top opening of the support sleeve to the bottom of the support sleeve. The top opening of the support sleeve (2) is also filled with filling material (5). The detonating cord (3) is connected to an electronic detonator (6) located outside the pre-splitting hole.

2. The mine pre-splitting blasting charge structure according to claim 1, characterized in that: The support sleeve (2) is a PVC sleeve.

3. The mine pre-splitting blasting charge structure according to claim 1 or 2, characterized in that: The inclination angle of the pre-cracked hole (1) is 50-80°.

4. The mine pre-splitting blasting charge structure according to claim 3, characterized in that: The length of the support sleeve (2) is 10-20m.

5. The mine pre-splitting blasting charge structure according to claim 1, 2 or 4, characterized in that: The diameter of the pre-cracked hole (1) is 110-160mm, and the outer diameter of the support sleeve is 70mm.

6. The mine pre-splitting blasting charge structure according to claim 5, characterized in that: The support sleeve (2) is inserted into the bottom of the pre-cracked hole.

7. The mine pre-splitting blasting charge structure according to claim 1, 2, 4 or 6, characterized in that: The filler material (5) is rock powder.

8. The mine pre-splitting blasting charge structure according to claim 1, 2, 4 or 6, characterized in that: The length of the filling material is 1.5-3m.

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