Pin explosion pit structure for safe destruction of civil explosives

Abstract

The invention discloses a pin explosion pit structure for safe destruction of civil explosives, and solves the problems of safety, noise and energy impact of an existing pin explosion pit to be further improved. According to the technical scheme, the pin explosion pit structure comprises a pit body located underground, the pit body is divided into an upper-layer pit body and a lower-layer pit body by a middle partition plate, and the lower-layer pit body is of a hollow structure; a civil explosive is arranged in the center of the bottom surface of the upper-layer pit body, a plurality of detonators which are connected in series through a detonating cord are arranged on the top surface of the civil explosive, and a lead of the detonating cord extends to an ignition station outside the pit body; the space from the bottom face of the upper-layer pit body to the pit opening is filled with sandbags. The device is simple in structure, good in safety and good in adaptability, energy release can be directionally controlled, and it is avoided that large impact and noise are possibly generated in the destroying process.

Description

Technical Field

[0001] The invention relates to the field of safe destruction of civil explosives, in particular to an explosion pit structure for safe destruction of civil explosives. Background Art

[0002] During long-term storage, explosives may be affected by temperature, humidity and other environmental factors, and undergo a series of changes in physical and chemical properties, such as moisture absorption, agglomeration, volatilization, crystallization, melting, decomposition, etc., which may cause the explosives to deteriorate, change their original performance, and greatly increase uncertainty and uncontrollability. This means that civil explosives equipment for oil perforation containing explosives cannot be stored and used indefinitely. They have a certain service life. After the expiration of their service life, they will not be able to meet the technical requirements and safety control of normal oil perforation operations, and will become hazardous waste with no industrial use value.

[0003] In addition, the places where civil explosives for oil perforating are stored for a long time are mostly civil explosive storage warehouses with relevant national blasting qualifications. Their number and scale are subject to certain restrictions, so their inventory is also limited. If the obsolete, expired, deteriorated, and damaged civil explosives for oil perforating are not safely destroyed in time, it will not only increase the management difficulty and safety risks of civil explosive storage warehouses, but also cause inconvenience to the arrival and warehousing of new batches of perforating equipment, which will bring difficulties to the normal implementation of the oil perforating production plan and have a certain impact on the orderly development of oil and gas fields.

[0004] The prior art usually uses a special device to destroy civil explosives. For example, the announcement number CN216144251U discloses a safe destruction device for civil explosives, including a base and an ultra-high pressure water gun. An explosion-proof box is fixedly installed in the middle of the upper surface of the base, and the inner bottom wall of the explosion-proof box is provided with a clamping mechanism; the clamping mechanism includes a lower fixed plate fixedly connected to the inner bottom wall of the explosion-proof box, and the upper surface of the lower fixed plate is provided with a first arc groove. The upper surface of the lower fixed plate near the first arc groove is provided with a connecting hole, and the interior of the connecting hole is plugged with a connecting column. The utility model is a safe destruction device for civil explosives. Through the setting of the explosion-proof box, the upper fixed plate in the explosion-proof box is raised, and then the discarded detonator is placed on the first arc groove of the lower fixed plate, the upper fixed plate is loosened, and the discarded detonator is fixed in the cooperation of the second arc groove and the first arc groove, and then the discarded detonator is cut with an ultra-high pressure water gun, which can be processed on site without transportation, explosion, and environmental pollution.

[0005] Announcement No. CN104897017B discloses a conical charge destruction device and a method for destroying civil explosives. The conical charge destruction device includes a conical charge portion and a safety detonator; the conical charge portion includes an outer shell, a charge cap, and a protective cover; a cavity for accommodating a conical charge column is formed between the inner wall of the outer shell and the outer wall of the charge cap; the safety detonator includes an upper body, a slide fixed on the upper body, and a detonating charge column installation chamber for installing a detonating charge column and a booster charge column installation chamber for installing a booster charge column installed in the lower part of the slide, the detonating charge column installation chamber is located above the booster charge column installation chamber and is connected to the detonating charge column installation chamber; a slider for controlling the detonation of a flame detonator is installed on the slide, and the slider is doubly locked on the slide by an electric safety and a manual safety. The present invention is designed with manual and electric safety, which can reliably ensure safety during normal storage and transportation and use, and the jet generated by the explosion of the conical charge can more effectively detonate the civil explosives to be destroyed.

[0006] The use of the above-mentioned special device to destroy civil explosive equipment has the following problems: small one-time destruction amount, complex structure, high cost, difficult operation, and safety needs to be further improved.

[0007] Announcement No. 218764926U discloses a safe destruction arrangement structure for civil explosives, including a pit body, the bottom surface of the pit body is filled with bottom sandbags, the center of the top surface of the bottom sandbags is provided with civil explosives, and multiple detonators connected in series via detonating cords are provided on the top surface of the civil explosives, and the space from the detonator to the pit mouth is filled with upper sandbags; the lead of the detonating cord extends to the ignition station outside the pit body. The above scheme can achieve safe destruction of civil explosives through deep pit filling, backfill protection, and upper detonation, with a large amount of destruction at one time and easy operation, but this single pit body has the following problems: 1) Safety risk: a single pit body cannot effectively control the propagation of explosion energy through shock wave reflection and dispersion, resulting in the possibility that the shock wave will produce a focusing effect inside the pit body, increasing the safety risks of the surrounding environment and personnel. 2) Difficulty in energy release: a single pit body may be difficult to effectively control and release energy, and some explosives may produce large explosion energy, making it difficult to effectively control energy in a single pit body. 2) Limited destruction effect: The design of a single pit may not be able to meet the destruction needs of different types and sizes of civil explosives, which may lead to limited destruction effect and inability to completely destroy explosives. 3) Environmental pollution: A single pit may generate greater impact and noise during the destruction process, which may cause pollution to the surrounding environment and nuisance to residents. Summary of the invention

[0008] The purpose of the present invention is to solve the above technical problems and to provide a blasting pit structure for the safe destruction of civil explosives which has a simple structure, good safety, good adaptability, can directional control the release of energy, and avoids the large impact and noise that may be generated during the destruction process.

[0009] The invention discloses a blasting pit structure for safely destroying civil explosives, comprising a pit body located below the ground, wherein the pit body is divided into an upper pit body and a lower pit body by a middle partition, wherein the lower pit body is a hollow structure, a civil explosive is arranged at the center of the bottom surface of the upper pit body, a plurality of detonators connected in series via a detonating cord are arranged on the top surface of the civil explosive, and the lead of the detonating cord extends to an ignition station outside the pit body; and sandbags are filled in the space from the bottom surface of the upper pit body to the pit mouth.

[0010] The top surface of the pit mouth sandbags is covered with a pure sand cover layer.

[0011] A soil buffer layer is also provided on the bottom surface of the upper pit body, and the civil explosives are located on the soil buffer layer.

[0012] The depth of the lower pit body is 1.2-1.5 times the depth of the upper pit body.

[0013] The middle partition is a steel plate or a reinforced concrete plate.

[0014] The bottom surface of the middle partition is provided with an explosion-guiding groove.

[0015] The bottom surface of the lower pit body is a lower arc-shaped surface.

[0016] The wall surface of the upper pit body is concrete wall surface, and the wall surface of the lower pit body is reinforced concrete wall surface.

[0017] The wall surface of the lower pit body has a concave-convex or wavy structure.

[0018] In view of the problems existing in the background technology, the inventor creatively adopts a two-layer pit structure, the upper layer is used to accommodate civil explosives, and the lower layer is a cavity structure. The middle partition will break during the explosion, and the explosion energy will be introduced into the lower pit. This double-layer structure detonation design has the following advantages: 1) The explosion energy and shock wave are directed to the lower pit to achieve the detonation effect. This can better control the explosion process and enhance the destruction effect; 2) The structure of the double-layer pit helps to disperse the energy generated by the explosion more evenly, reduce the impact of the shock wave on the structure, and protect related equipment and the surrounding environment; 3) The design of the double-layer pit can provide a stronger and more stable structural support, reduce the possibility of structural deformation and damage, and when the wall of the upper pit is a concrete wall and the wall of the lower pit is a reinforced concrete wall, the pit can be reused after a slight trimming after the explosion is completed, which is suitable for the needs of different scales of explosion destruction; 4) By controlling the shock wave and energy dispersion, the double-layer pit helps to protect the surrounding environment from the impact of shock waves and fragments.

[0019] It is further preferred that the depth of the lower pit body should be greater than that of the upper pit body to obtain sufficient impact space, thereby ensuring the effectiveness of directional guidance of the explosion energy. Preferably, the depth of the lower pit body is 1.2-1.5 times the depth of the upper pit body. The middle partition may be a high polymer plate, a steel plate or a reinforced concrete plate. The specific material and thickness are selected to meet the weight bearing before the explosion and to be able to break immediately during the explosion. In order to further achieve the purpose of instantaneous guidance of the explosion, a detonation groove may be opened on the bottom surface. In this way, when the top surface of the middle partition is subjected to impact force, it will break along the detonation groove, ensuring that the energy of the explosion enters the lower pit body along a predetermined position and direction, effectively playing a guiding role. The position of the detonation groove can be reasonably designed according to needs. Preferably, the detonation groove is arranged along the center straight line or cross line of the middle partition. Those skilled in the art can also choose other arrangements according to specific needs.

[0020] Furthermore, the bottom surface of the lower pit body is a lower arc-shaped surface. This arc-shaped surface can guide the shock wave to be reflected and refracted multiple times inside the lower pit body, increase the frequency and angle of reflection, and effectively slow down the propagation speed and intensity of the shock wave; the arc-shaped bottom surface can cause the shock wave to scatter, thereby dispersing the energy more evenly in the lower pit body, helping to reduce the impact of the shock wave and protect the entire structure; the arc-shaped bottom surface can provide a more solid and stable structural support, reducing the possibility of structural deformation and damage. Finally, the arc-shaped bottom surface design can make more effective use of space, especially when the site area is limited, it helps to provide a larger lower-level accommodation space.

[0021] Furthermore, the side wall of the lower pit body has a concave-convex or wavy structure, which helps to reflect the shock wave multiple times, thereby effectively weakening the energy of the shock wave.

[0022] The pinning and explosion pit of the structure of the present invention has the advantages of simple structure, good safety, good adaptability, and the ability to control the release of energy in a directional manner, thereby avoiding the possibility of large impact and noise generated during the destruction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] Figure 2 The bottom view of the middle isolation plate.

[0025] Among them, 1-pit body, 2-upper pit body, 3-lower pit body, 4-civil explosives, 5-detonator, 6-middle partition, 7-pure sand cover layer, 8-fuse, 9-ignition station, 10-sandbag, 11-soil buffer layer, 12-detonation trough, 13-lower arc surface, 14-concave and convex structure. DETAILED DESCRIPTION

[0026] The invention is further explained below with reference to the accompanying drawings:

[0027] See also Figure 1 The present invention comprises a pit body 1 located below the ground, the pit body 1 is divided into an upper pit body 2 and a lower pit body 3 by a middle partition 6, the lower pit body 3 is a hollow structure, the side wall surface has a concave-convex or wavy structure (the concave-convex structure 14 in the figure), the bottom surface is a lower arc surface 13, and the depth h2 of the lower pit body is 1.2-1.5 times the depth h1 of the upper pit body (the thickness of the middle partition is negligible). Figure 2 The middle partition 3 is a steel plate, and a "cross-shaped" detonation groove 12 is opened on the bottom surface.

[0028] A soil buffer layer 11 is provided on the bottom of the upper pit body 2, a civil explosive 4 is provided at the center of the soil buffer layer 11, and a plurality of detonators 5 connected in series via a detonating cord are provided on the top of the civil explosive 4, and the lead 9 of the detonating cord extends to an ignition station 9 outside the pit body 1; sandbags 10 are filled in the space from the bottom of the upper pit body 2 to the pit mouth, and the top surface of the sandbags 10 at the pit mouth is covered with a pure sand cover layer 7. Preferably, the wall surface of the upper pit body 2 is a concrete wall surface, and the wall surface of the lower pit body 3 is a reinforced concrete wall surface.

[0029] Experimental evaluation of safe destruction of civil explosives:

[0030] When the explosive equivalent Q of a single destruction is 10kg, a pit with a depth of 3m and a width of 4m is dug downward, of which the upper pit body is 1.2m and the lower pit body is 1.8m. The bottom surface of the upper pit body is covered with a 22cm soil buffer layer 11, and the top surface of the sandbag at the pit mouth 1 is covered with a 20cm pure sand cover layer 7; the thickness of the middle partition 6 is 8cm. The civil explosive 4 described in this embodiment is a perforating bullet for oil perforation.

[0031] Experimental results:

[0032] 1) After destroying the perforating bullet using the safe destruction method for civil explosives, the destruction effect was checked. It was found that due to the breakage of the middle partition 6, the upper and lower pit bodies 2 and 3 formed a pit body, the perforating bullet exploded completely, and the pit body wall was relatively intact. A little repair was required before the next explosion;

[0033] 2) After destroying the perforating bullets using the safe destruction method for civilian explosives, the buildings and related facilities 400 meters away from the pit were checked and found to be free of damage from the blasting impact; the noise was detected 400 meters away from the pit and was reduced by 32% compared with the technical solution of Publication No. 218764926U.

Claims

1. A blasting pit structure for safely destroying civil explosives, comprising a pit body located below the ground, characterized in that: The pit body is divided into an upper pit body and a lower pit body by a middle partition. The lower pit body is a hollow structure. Civil explosives are arranged at the center of the bottom of the upper pit body, and multiple detonators connected in series via detonating cords are arranged on the top of the civil explosives. The lead of the detonating cord extends to an ignition station outside the pit body; the space from the bottom of the upper pit body to the pit mouth is filled with sandbags.

2. 如权利 要 求1所述的民爆物品安全销毁 用 销爆坑结构 ， 其特 The characteristic is that the top surface of the sandbags at the pit mouth is covered with a pure sand cover layer.

3. The explosion pit structure for safe destruction of civil explosives according to claim 1, characterized in that: A soil buffer layer is also provided on the bottom surface of the upper pit body, and the civil explosives are located on the soil buffer layer.

4. The explosion pit structure for safe destruction of civil explosives according to any one of claims 1 to 3, characterized in that: The depth of the lower pit body is 1.2-1.5 times the depth of the upper pit body.

5. The explosion pit structure for safe destruction of civil explosives as claimed in claim 1, characterized in that: The middle partition is a steel plate or a reinforced concrete plate.

6. The explosion pit structure for safe destruction of civil explosives as claimed in claim 1 or 5, characterized in that: The bottom surface of the middle partition is provided with an explosion-guiding groove.

7. The explosion pit structure for safe destruction of civil explosives as claimed in claim 1, characterized in that: The bottom surface of the lower pit body is a lower arc-shaped surface.

8. The explosion pit structure for safe destruction of civil explosives as claimed in claim 1, characterized in that: The wall surface of the upper pit body is concrete wall surface, and the wall surface of the lower pit body is reinforced concrete wall surface.

9. The explosion pit structure for safe destruction of civil explosives as claimed in claim 1 or 8, characterized in that: The wall surface of the lower pit body has a concave-convex or wavy structure.

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