A pre-splitting blasting charge structure

Abstract

The utility model relates to the technical field of engineering blasting discloses a pre-splitting blasting charge structure, including the PVC pipe body of installation in the blasthole, the PVC pipe body includes the main pipe and sets up the hole bottom reinforcing pipe at its bottom, the diameter of hole bottom reinforcing pipe is greater than the main pipe, the main pipe is connected with hole bottom reinforcing pipe through the reducing connector, the bottom of hole bottom reinforcing pipe is provided with the plug, the inside of PVC pipe body still is provided with the charge part, the charge part includes the coupling charge part in hole bottom reinforcing pipe and the axial continuous charge part in the main pipe. The utility model provides the charge structure stable and reliable, can improve the pre-splitting blasting effect stability greatly, on the other hand, the charge structure effectively improves the hole distance, greatly reduces the drilling consumption, not only saves the cost, still effectively improved the construction efficiency.

Description

Technical Field

[0001] This application relates to the technical field of engineering blasting, and in particular to a pre-splitting blasting charge structure. Background Technology

[0002] In traditional pre-splitting blasting operations, the commonly used charging structure in China is "detonating cord + bamboo strips + explosive cartridge". During construction, explosive charges are made on-site, and emulsion explosives of a specific diameter are tied along the bamboo strips and detonating cord at certain intervals to form an axially spaced and radially uncoupled charging structure. Then, multiple workers insert the prepared explosive cartridges into the blast hole in a certain direction. Figure 1 This method has significant drawbacks: 1. It requires small hole spacing and a large number of boreholes, increasing the workload and time cost, and may also cause greater disturbance to the surrounding geological environment; 2. It requires the use of detonating cord and bamboo strips, and the on-site fabrication of explosive charges is cumbersome, resulting in high overall costs; 3. It has low construction efficiency, as the on-site fabrication and insertion of explosive charges requires multiple people and is time-consuming, affecting the progress of blasting operations; 4. The blasting effect is unstable, making it difficult to guarantee that each blast will achieve the desired effect, which has an adverse impact on the quality of the project.

[0003] Therefore, developing a pre-splitting explosive charge structure to solve the technical problems existing in current blasting technology has become a technical problem that needs to be solved. Utility Model Content

[0004] To address the technical problems of high cost, low efficiency, and poor blasting effect in existing charge structures, this application provides a pre-splitting blasting charge structure.

[0005] A pre-splitting explosive charge structure includes a PVC pipe body installed in a borehole. The PVC pipe body includes a main pipe and a bottom reinforcing pipe disposed at its bottom. The diameter of the bottom reinforcing pipe is larger than that of the main pipe. The main pipe is connected to the bottom reinforcing pipe via a reducing connector. A plug is disposed at the bottom of the bottom reinforcing pipe. An explosive charge section is also disposed inside the PVC pipe body. The explosive charge section includes a coupled explosive charge section located in the bottom reinforcing pipe and an axially continuous explosive charge section located in the main pipe.

[0006] By adopting the above technical solution, this pre-splitting blasting charge structure uses PVC pipes as the charge carrier, which can be pre-installed after drilling and before blasting operations, without occupying blasting operation time, simplifying the construction process and improving construction efficiency. Furthermore, the diameter of the bottom reinforcing pipe is larger than that of the main pipe and a coupled charge section is adopted to expand the hole spacing, greatly reducing drilling consumption and effectively saving time costs. At the same time, the entire structure does not require detonating cord and bamboo strips, effectively reducing the overall cost. Due to the setting of PVC pipes, the charge structure is stable and reliable, improving the stability of the pre-splitting blasting effect.

[0007] Furthermore, the variable diameter connector is a straight-mouth variable diameter connector or a beveled variable diameter connector.

[0008] By adopting the above technical solutions, straight-mouth reducing connectors or bevel-mouth reducing connectors can connect main pipes of different diameters to bottom-hole reinforcing pipes. They can be flexibly selected according to actual needs, ensuring the integrity and sealing of the PVC pipe structure, which is conducive to improving the stability and reliability of the charge structure, and thus enhancing the stability of the pre-splitting blasting effect.

[0009] Furthermore, the diameter of the main tube is 40mm or 50mm, and the diameter of the bottom reinforcing tube is 75mm or 90mm.

[0010] By adopting the above technical solutions, selecting main pipes with a diameter of 40mm or 50mm and bottom reinforcing pipes with a diameter of 75mm or 90mm, it is possible to better adapt to different blasting requirements and improve the stability and efficiency of blasting operations.

[0011] Furthermore, the wall thickness of the main pipe and the bottom reinforcing tube is 3.5 mm, and the length of the bottom reinforcing tube ranges from 60 cm to 100 cm.

[0012] By adopting the above technical solution, the wall thickness of the main pipe and the bottom reinforcing pipe is set to 3.5mm, which ensures that the PVC pipe body has sufficient strength to resist impact and meets the requirement of impact strength ≥10kJ / m², preventing the pipe body from being damaged during construction. On the other hand, the length range of the bottom reinforcing pipe is set to 60cm-100cm, which can form a suitable reinforcing charge section at the bottom of the hole, so that the explosive in this section is compressed into the pipe under the acceleration of gravity, enhancing the blasting effect and improving the stability of the overall pre-splitting blasting.

[0013] Furthermore, the main pipe is exposed outside the blast hole to form an exposed section, and the length of the exposed section is 20cm.

[0014] By adopting the above technical solution, on the one hand, the exposed section design facilitates subsequent operations such as charging and detonator insertion, which can improve the convenience and accuracy of construction; on the other hand, when there is water in the borehole, the exposed section can prevent water from directly entering the pipe and affecting the performance of the explosive; at the same time, when the borehole section is blocked with sand and gravel, it can also provide a certain operating space for construction, which helps to complete the blocking better, thereby ensuring the stability of the entire pre-splitting blasting charge structure.

[0015] Furthermore, the top interior of the main tube is filled with fine sand to form a filling section, the filling section being 1.5m in length.

[0016] By adopting the above technical solution, a 1.5m long fine sand filling section is formed at the top of the main pipe to create a dense sealing barrier at the top of the PVC pipe. This effectively prevents the escape of explosive gases, allowing for more complete utilization of the explosive energy and improving the blasting effect. Furthermore, it effectively fixes the lead wire of the electronic detonator, prevents flying debris to improve safety, enhances the efficiency and quality of blasting, and reduces the impact of blasting on the surrounding environment.

[0017] Furthermore, a sand and gravel fixing layer is filled between the outer wall of the PVC pipe and the inner wall of the borehole to prevent the PVC pipe from floating. The length of the sand and gravel fixing layer extending downward from the borehole opening is 1m to 1.5m.

[0018] By adopting the above technical solution, a 1m to 1.5m long sand and gravel fixing layer is filled between the outer wall of the PVC pipe and the inner wall of the blast hole, which can effectively prevent the PVC pipe from floating due to water pressure and buoyancy, ensuring its stable position in the blast hole, thereby ensuring the stability of the charge structure, so that the blasting operation can be carried out according to the predetermined plan, and improving the stability of the pre-splitting blasting effect.

[0019] Furthermore, the coupling charge section is formed by compacting the punctured emulsion explosive under gravity, and the linear charge density of the coupling charge section is 2.4 kg / m to 3.2 kg / m.

[0020] By adopting the above technical solution, the coupling charge section is formed by compacting the broken emulsion explosive under gravity, and the linear charge density is 2.4kg / m~3.2kg / m. This allows the explosive in the reinforced section at the bottom of the hole to be coupled inside the tube, enhancing the blasting effect at the bottom of the hole, and thus improving the overall stability of the pre-splitting blasting effect.

[0021] Furthermore, the axial continuous charge section is composed of multiple rolls of emulsion explosives, and the linear charge density of the axial continuous charge section is 1.0 kg / m to 1.1 kg / m.

[0022] By adopting the above technical solution, the axial continuous charge section is composed of multiple rolls of emulsion explosives, and the linear charge density is 1.0 kg / m to 1.1 kg / m. This charging method is simple and convenient, and can achieve efficient charging. At the same time, the reasonable linear charge density, combined with the coupling charge section at the bottom of the hole, can effectively improve the stability of the pre-splitting blasting effect.

[0023] Furthermore, the PVC pipe body also includes an electronic detonator, which is inserted into the axially continuous charge section inside the main pipe, and the lead wire of the electronic detonator is led out from the top interior of the main pipe.

[0024] By adopting the above technical solution, an electronic detonator is installed inside the PVC pipe and inserted into the axial continuous charging section inside the main pipe. The lead wire is led out from the top of the main pipe, which can accurately control the blasting time and sequence, improve the safety and accuracy of blasting, and further enhance the pre-splitting blasting effect by combining it with the PVC pipe charging structure, making the blasting operation more efficient and stable.

[0025] In summary, this application includes at least the following beneficial technical effects: 1. This application effectively expands the hole spacing by setting PVC pipes, which effectively reduces the amount of drilling per unit area compared with traditional pre-splitting blasting process, reduces the workload of construction, and saves equipment wear, manpower and time costs during the drilling process; furthermore, it eliminates the use of detonating cord and bamboo strips, reducing material costs and labor costs, and greatly reducing the overall cost.

[0026] 2. The PVC pipe body can be pre-installed after drilling is completed and before the blasting operation begins, which greatly shortens the blasting operation cycle time, improves construction efficiency, and the charging structure is stable and reliable, which can greatly improve the stability of the pre-splitting blasting effect. Attached Figure Description

[0027] Figure 1 This is a structural cross-sectional view of a pre-splitting explosive charge structure in the prior art; Figure 2 This is a cross-sectional view of the PVC pipe body of the pre-splitting explosive charge structure provided in Embodiment 1 of this utility model; Figure 3 This is a structural cross-sectional view of a pre-splitting explosive charge structure provided in Embodiment 1 of this utility model; Figure 4 This is a cross-sectional view of the PVC pipe body of the pre-splitting explosive charge structure provided in Embodiment 2 of this utility model; Figure 5 This is a structural cross-sectional view of a pre-splitting explosive charge structure provided in Embodiment 2 of this utility model.

[0028] Explanation of reference numerals in the attached figures: 1. Blast hole; 2. Bamboo strip; 3. Detonating cord; 4. Explosive cartridge; 5. Reinforced explosive cartridge; 11. Plug section; 6. PVC pipe body; 61. Main pipe; 62. Bottom reinforcing pipe; 63. Variable diameter connector; 64. Plug; 611. Straight connector; 612. Exposed section; 613. Stuffing section; 7. Explosive loading section; 71. Coupled explosive loading section; 72. Axial continuous explosive loading section; 8. Electronic detonator; 81. Lead wire; 9. Sand and gravel fixing layer. Detailed Implementation

[0029] The following combination Figure 2-5 The technical solutions in the embodiments of this utility model will be described in detail.

[0030] Example 1 See Figure 1-2 Example 1 provides a pre-splitting explosive charge structure, including a PVC pipe body 6 installed in a borehole 1. The PVC pipe body 6 includes a main pipe 61 and a bottom reinforcing pipe 62 disposed at its bottom. The diameter of the bottom reinforcing pipe 62 is larger than that of the main pipe 61. The main pipe 61 is connected to the bottom reinforcing pipe 62 through a reducing connector 63. A plug 64 is disposed at the bottom of the bottom reinforcing pipe 62. The PVC pipe body 6 also has an explosive charge section 7 disposed inside. The explosive charge section 7 includes a coupling explosive charge section 71 located in the bottom reinforcing pipe 62 and an axial continuous explosive charge section 72 located in the main pipe 61.

[0031] The main pipe 61 is formed by connecting multiple pipes of the same diameter through a straight connector 611. In this embodiment, the variable diameter connector 63 is a beveled variable diameter connector. The main pipe 61 and the bottom reinforcing pipe 62 are respectively inserted into the two ends of the beveled variable diameter connector and sealed with PVC glue.

[0032] Specifically, the coupling charge section 71 is formed by compacting the punctured emulsion explosive under gravity, and the linear charge density of the coupling charge section 71 is 2.4 kg / m to 3.2 kg / m. The axial continuous charge section 72 is composed of multiple explosive rolls 4, and the explosive rolls 4 are whole rolls of emulsion explosive. The linear charge density of the axial continuous charge section 72 is 1.0 kg / m to 1.1 kg / m.

[0033] Continue reading Figure 2 The PVC pipe body 6 also includes an electronic detonator 8, which is inserted into the axial continuous charging section 72 inside the main pipe 61. The lead wire 81 of the electronic detonator 8 is led out from the top of the main pipe 61, further cooperating with the PVC pipe body 6 to further improve the pre-splitting blasting effect and make the blasting operation more efficient and stable.

[0034] To improve the ease of construction and ensure the stability of the entire pre-splitting blasting charge structure, the main pipe 61 is exposed outside the blast hole to form an exposed section 612, and the length of the exposed section 612 is 20cm. The top of the main pipe is filled with fine sand to form a filling section 613, and the length of the filling section 613 is 1.5m.

[0035] Furthermore, in order to effectively prevent the PVC pipe 6 from floating due to water pressure and buoyancy, a sand and gravel fixing layer 9 for preventing the PVC pipe 6 from floating is filled between the outer wall of the PVC pipe 6 and the inner wall of the borehole 1. The length of the sand and gravel fixing layer 9 extending downward from the borehole 1 is 1m to 1.5m. In Example 1, the length of the sand and gravel fixing layer 9 extending downward from the borehole 1 is 1m.

[0036] To improve the stability and reliability of the charge structure, the diameter of the main pipe 61 is 40mm or 50mm, the diameter of the bottom reinforcing tube 62 is 75mm or 90mm, the wall thickness of the main pipe 61 and the bottom reinforcing tube 62 is 3.5mm, and the length of the bottom reinforcing tube 62 ranges from 60cm to 100cm. In Example 1, the diameter of the main pipe 61 is 50mm, the diameter of the bottom reinforcing tube 62 is 90mm, and the length of the bottom reinforcing tube 62 is 60cm.

[0037] Example 2 The difference between Example 2 and Example 1 is that Example 2 provides a pre-splitting explosive charge structure in which the reducing connector 63 connecting the main pipe 61 and the bottom reinforcing pipe 62 is a straight reducing connector. The main pipe 61 and the bottom reinforcing pipe 62 are respectively inserted into the two ends of the straight reducing connector and sealed with PVC glue.

[0038] The working principle of Examples 1 and 2 is as follows: First, the main pipe 61 and the bottom reinforcing pipe 62 are connected by a reducing connector 63, and a plug 64 is installed at the bottom of the bottom reinforcing pipe 62; then, the assembled PVC pipe body 6 is slowly pressed into the borehole 1, with the top of the main pipe 61 exposed in the borehole 1. Sand and gravel are filled in the gap between the borehole 1 and the main pipe 61 to form a sand and gravel fixing layer 9 of a certain thickness to prevent the PVC pipe from floating due to water pressure and buoyancy. Then, the punctured emulsion explosive is filled into the bottom reinforcing pipe 62 and compacted under gravity to form a coupled charge section 71; multiple explosive cartridges 4 are filled into the main pipe to form an axially continuous charge section 72. At the same time, an electronic detonator 8 is filled into the main pipe; finally, fine sand is filled into the top of the main pipe 61 to form a plugging section 613.

[0039] The PVC pipe body 6 of this application can be pre-installed after drilling and before blasting. During charging, the explosive roll 4 and electronic detonator 8 are directly loaded into the PVC pipe body 6. The construction is simple, the blasting cycle time is greatly shortened, and the charging structure is stable and reliable, which can greatly improve the stability of the pre-splitting blasting effect. Furthermore, this application effectively expands the hole spacing of the borehole 1, greatly reduces the drilling consumption per unit area, effectively simplifies the construction, and greatly reduces the overall cost and time cost.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pre-splitting explosive charge structure, characterized in that: The device includes a PVC pipe body installed inside a borehole. The PVC pipe body includes a main pipe and a bottom reinforcing pipe disposed at its bottom. The diameter of the bottom reinforcing pipe is larger than that of the main pipe. The main pipe is connected to the bottom reinforcing pipe via a reducing connector. A plug is disposed at the bottom of the bottom reinforcing pipe. The PVC pipe body also has a charging section inside. The charging section includes a coupling charging section located inside the bottom reinforcing pipe and an axially continuous charging section located inside the main pipe.

2. The pre-splitting explosive charge structure according to claim 1, characterized in that: The variable diameter connector is either a straight-mouth variable diameter connector or a beveled variable diameter connector.

3. The pre-splitting explosive charge structure according to claim 1, characterized in that: The diameter of the main tube is 40mm or 50mm, and the diameter of the bottom reinforcing tube is 75mm or 90mm.

4. The pre-splitting explosive charge structure according to claim 1, characterized in that: The wall thickness of the main pipe and the bottom reinforcing tube is 3.5 mm, and the length of the bottom reinforcing tube ranges from 60 cm to 100 cm.

5. The pre-splitting explosive charge structure according to claim 1, characterized in that: The main pipe is exposed outside the blast hole to form an exposed section, and the length of the exposed section is 20cm.

6. The pre-splitting explosive charge structure according to claim 1, characterized in that: The top interior of the main pipe is filled with fine sand to form a filling section, the length of which is 1.5m.

7. The pre-splitting explosive charge structure according to claim 1, characterized in that: The outer wall of the PVC pipe and the inner wall of the borehole are filled with a sand and gravel fixing layer to prevent the PVC pipe from floating. The length of the sand and gravel fixing layer extending downward from the borehole opening is 1m to 1.5m.

8. The pre-splitting explosive charge structure according to claim 1, characterized in that: The coupled charge section is formed by compacting punctured emulsion explosive under gravity, and the linear charge density of the coupled charge section is 2.4 kg / m to 3.2 kg / m.

9. The pre-splitting explosive charge structure according to claim 1, characterized in that: The axial continuous charge section is composed of multiple rolls of emulsion explosives, and the linear charge density of the axial continuous charge section is 1.0 kg / m to 1.1 kg / m.

10. A pre-splitting explosive charge structure according to claim 1, characterized in that: The PVC pipe body also includes an electronic detonator, which is inserted into the axially continuous charge section inside the main pipe, and the lead wire of the electronic detonator is led out from the top interior of the main pipe.

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