Pre-splitting blasting seam pipe and use method thereof

Abstract

The present invention discloses a pre-splitting blasting slit pipe and a method for using the same, which relates to the technical field of pre-splitting blasting slit pipes. The pre-splitting blasting slit pipes include several sections of slit pipes connected by joints. The two ends of the joints are respectively plugged into two sections of slit pipes and matched by a clamping structure. Adjacent joints are connected by a fixing device provided inside the slit pipes. The fixing device is provided with several emulsion explosive cartridges with adjustable spacing. One of the joints located at the end is provided with a flame extinguishing unit, and the remaining joints are provided with at least two centering airbags. The present invention solves the problems in the prior art that pre-splitting blasting slit pipes cannot meet the requirements of emulsion explosive cartridge fixation, the amount of explosives cannot be flexibly adjusted, the pre-splitting blasting slit pipes cannot be flexibly centered when installed in a borehole, and the safety during blasting is not high. The present method can adapt to the needs of blasting boreholes of different lengths, has a simple assembly process, a flexible and adaptable assembly matching scheme, high safety, and a good blasting slit effect.

Description

Technical Field

[0001] The invention relates to the technical field of pre-splitting blasting slotted pipes, in particular to a pre-splitting blasting slotted pipe and a use method thereof. Background Art

[0002] The existing pre-splitting blasting technology generally places emulsion explosives and detonating cords directly in PVC pipes, and blasts directly after successful installation in the borehole. The current technology has the following difficulties: due to the hidden nature of long boreholes, the angle of the deep pipe cannot be adjusted at the borehole mouth, and when blasting, it is impossible to concentrate energy in the direction of the slit connection line, which results in poor blasting effect. Secondly, the existing blasting slit pipes have the difficulty of being accurately aligned in long-distance boreholes; thirdly, the emulsion explosive loading position of a single-section pipe cannot be fixed, and the problem of more charging in hard rock layers and less charging in soft rock layers cannot be achieved; fourthly, the existing pipe interface cannot solve the problem of preventing emulsion explosives from falling. In addition, the existing technology also has low safety performance, and it is easy for explosive flames to appear in the blasted borehole, resulting in a low blasting safety factor. Based on the technical problems existing in the above-mentioned blasting tests, there is no relevant solution yet, so there is an urgent need to find an effective solution to the above-mentioned problems.

[0003] To improve the effectiveness of pre-splitting blasting technology, the blasting slotting pipes designed in Chinese invention patents CN114777588A and CN113295064A have limited applicability for different emulsion explosive specifications. The PVC pipe for blasting designed in Chinese utility model patent CN202582379U cannot be centered within the drilled hole. Therefore, an effective solution to these problems is urgently needed. Summary of the Invention

[0004] In response to the deficiencies in the above-mentioned background technology, the present invention proposes a pre-splitting blasting slit tube and a method for using the same, which solves the problems in the prior art that the pre-splitting blasting slit tube cannot meet the requirements of fixing the emulsion explosive roll, the amount of explosives cannot be flexibly adjusted, the pre-splitting blasting slit tube cannot be flexibly centered when installed in the drilled hole, and the safety is not high during blasting.

[0005] The technical solution of the present invention is achieved as follows: a pre-splitting blasting slit pipe includes several sections of slit pipes, which are connected by joints. The two ends of the joints are respectively plugged into two sections of the slit pipes and matched with a clamping structure. Adjacent joints are connected by a fixing device provided inside the slit pipes, and the fixing device is provided with several emulsion explosive cartridges with adjustable spacing; one of the joints at the end is provided with a flame extinguishing unit, and the remaining joints are provided with at least two centering air bags.

[0006] Preferably, the joint is a cylindrical joint, a through hole is provided in the middle of the joint, at least two airbag accommodating cavities for storing centering airbags or fire extinguishing units are provided circumferentially inside the joint, a release opening connected to the airbag accommodating cavity is provided on the side wall of the joint, and an airbag propulsion port connected to the airbag accommodating cavity is provided at one end of the joint; a net bag connecting rod for connecting to the fixing device is provided in the through hole.

[0007] Preferably, the centering airbag includes a soft bag body, a gas generator is provided in the soft bag body, and the gas generator is arranged corresponding to the release opening; the fire extinguishing unit includes a thin film water bag, the inside of the water bag is filled with water; the water bag and the soft bag body are both detachable and arranged in the airbag accommodating cavity.

[0008] Preferably, the airbag accommodating cavity is a ring-shaped cavity, and the gas generator includes a structural frame connected to the inner wall of the soft bladder body on one side, a water-soluble membrane is provided on the other side of the structural frame, and an isolation membrane is provided in the middle of the structural frame. The structural frame between the isolation membrane and the soft bladder body is filled with dilute hydrochloric acid, and the inner wall of the soft bladder body is fixedly provided with a puncture structure that slides with the structural frame and corresponds to the isolation membrane. The puncture structure is located on the inner side of the structural frame, and calcium carbonate powder is provided in the soft bladder body.

[0009] Preferably, the puncture structure includes a mounting frame fixedly connected to the soft bladder body, with sliders connected to both ends of the mounting frame, a sliding groove that slides with the slider is provided on the structural frame between the isolation membrane and the soft bladder body, and a plurality of spikes are provided on the side of the mounting frame corresponding to the isolation membrane.

[0010] Preferably, grooves are provided at both ends of the side walls of the joint, and the clamping structure includes a clamping block hinged to one side of the groove, the groove can accommodate the clamping block, and a spring is provided between the clamping block and the bottom of the groove.

[0011] Preferably, both ends of the slit pipe are provided with annular grooves corresponding to the blocks, the blocks are triangular blocks, and the groove cross-section structure of the annular grooves is an isosceles triangle; the side walls of the slit pipe are correspondingly provided with two groups of prefabricated holes or two long strips of prefabricated slits.

[0012] Preferably, the fixing device includes a net bag, both ends of which are detachably connected to corresponding joints through net bag connecting rods, a number of elastic plastic ropes are tied to the net bag and the net bag is divided into a number of fixed parts by the elastic plastic ropes, the emulsion explosive rolls are arranged in the net bag corresponding to the fixed parts, and the position and spacing of the emulsion explosive rolls are limited by the elastic plastic ropes; adjacent emulsion explosive rolls and the emulsion explosive rolls on both sides of the joint are connected by detonating cords, and the detonating cords between the emulsion explosive rolls on both sides of the joint are arranged in the through hole.

[0013] A method for using a pre-splitting blasting seam pipe, characterized by comprising the following steps:

[0014] Preparation work: Select the specifications and dosage of emulsion explosive cartridges according to the hardness of the rock formation required for pre-splitting blasting. Prepare the required number of slit pipes, the corresponding number of joints and the total dosage of emulsion explosive cartridges according to the required blasting drilling depth for pre-splitting blasting. Install a flame extinguishing unit on one of the joints and centering air bags on the remaining joints.

[0015] Assembly process: several selected emulsion explosive rolls are loaded into the net bag in turn, and the elastic plastic rope is tied to the outside of the net bag. The position of the elastic plastic rope in the length direction of the net bag is adjusted to limit the position of the emulsion explosive rolls to meet the amount of explosives used; the net bag is passed through the inside of the slit pipe, and both ends of the net bag are connected to the joints placed at both ends of the slit pipe, and the joints are plugged into the end of the slit pipe. The remaining slit pipes, joints, and net bags are connected in turn to form a pre-splitting blasting slit pipe, and the joint equipped with the open flame extinguishing unit is placed at one end.

[0016] Installation process: adjust the angle of the pre-splitting blasting slit tube to adjust the slit direction, insert the pre-splitting blasting slit tube vertically into the blasting drill hole, trigger the centering airbags in the joints one by one while inserting, and insert the end with the flame extinguishing unit last. After a delay period after insertion, the centering airbag begins to expand and contact the side wall of the blasting drill hole to achieve centering and fixation of the pre-splitting blasting slit tube.

[0017] Blasting process: The emulsion explosive cartridge is detonated, and a good cutting surface is formed on the blasting borehole wall under the action of the cutting pipe.

[0018] Preferably, the installation process also includes the following steps: preparing a section of slit pipe and connecting it to the joint where the open flame extinguishing unit is located, then inserting the pre-splitting blasting slit pipe into the blasting drill hole, and after the centering airbag is expanded to center and fix the pre-splitting blasting slit pipe, the top section of the slit pipe is removed from the joint containing the open flame extinguishing unit, thereby forming a sealed hole section between the open flame extinguishing unit and the opening of the blasting drill hole.

[0019] The beneficial effects of the present invention's structure include: a snap-fit ​​structure facilitates rapid fastening of the slitting pipe and connector, improving installation efficiency. The fixing device secures the emulsion explosive coils and allows for adjustment of the spacing and charge volume of the emulsion explosive coils as needed to meet the actual blasting charge requirements. A centering airbag, provided on the connector, releases from the connector after installation to position the pre-splitting blasting slitting pipe between the inner wall of the blasting borehole and the outer wall of the pre-splitting blasting slitting pipe, providing flexible centering and securing of the pre-splitting blasting slitting pipe. The slitting pipe allows for adjustment of the slitting direction during insertion into the blasting borehole. The slitting direction is further adjusted and controlled by forming a preformed hole or preformed slit, and the slitting direction is controlled by the orientation of the preformed hole or preformed slit during installation. Furthermore, a flame extinguishing unit is provided on one of the end connectors, which can be triggered during blasting to prevent flames from forming within the borehole and the pre-splitting blasting slitting pipe. The assembled length of the structure can be adjusted according to actual needs, and it has strong adaptability. This solves the problems in the prior art of pre-splitting blasting slit tubes that cannot meet the requirements of emulsion explosive coil fixation, the amount of explosives cannot be flexibly adjusted, the slit tubes cannot be flexibly aligned when installed in the drilled hole, and the safety during blasting is low.

[0020] The beneficial effects of the method of the present invention include providing a method for assembling and using a cracking blasting slitting pipe, which can adapt to the needs of blasting drilling of different lengths. The assembly process is simple, and the assembly and matching scheme is flexible and adaptable. The blasting slitting process performed using this method is highly safe and has good blasting slitting effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a schematic diagram of the connection between the slit pipe and the joint of the present invention;

[0023] Figure 2 Schematic diagram of the joint structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the connection between the fire extinguishing unit and the connector of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection between the centering airbag and the connector of the present invention;

[0026] Figure 5 Schematic diagram of the external structure of the gas generator of the present invention;

[0027] Figure 6 Schematic diagram of the internal structure of the gas generator of the present invention;

[0028] Figure 7 This is a schematic structural diagram of the puncture structure of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the clamping structure of the present invention;

[0030] Figure 9 A schematic diagram of the slit pipe structure with prefabricated slits provided in the present invention;

[0031] Figure 10 A schematic diagram of the slit pipe structure with prefabricated holes provided in the present invention;

[0032] Figure 11 This is a schematic diagram of the structure of the slit pipe end portion of the present invention;

[0033] Figure 12 It is a schematic structural diagram of the fixing device of the present invention. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 4As shown in Example 1, a pre-splitting blasting slitting pipe comprises several sections of slitting pipe 1. The angle of the slitting pipe can be adjusted during insertion into a blasting drill hole, thereby controlling the direction of the slitting pipe. The slitting pipes 1 are connected by joints 2, each of which is pluggable into two sections of slitting pipe 1 and engages with a snap-fit ​​structure. The snap-fit ​​structure allows for quick fastening of the slitting pipes and joints, improving installation efficiency. Adjacent joints 2 are connected by a fixture located within the slitting pipe 1. The fixture is equipped with several emulsion explosive cartridges 19 with adjustable spacing. The fixture secures the emulsion explosive cartridges and allows for adjustment of the spacing and charge volume of the emulsion explosive cartridges as needed to meet the actual blasting requirements. One of the joints 2 at the end is equipped with a flame extinguishing unit that can be triggered during blasting to prevent flames from forming within the drilling and pre-splitting blasting slitting pipe. The remaining joints 2 are each equipped with at least two centering airbags 3. After the pre-splitting blasting slit tube is installed, a centering airbag is released from the joint to the space between the inner wall of the blasting borehole and the outer wall of the pre-splitting blasting slit tube, providing flexible centering and fixation for the pre-splitting blasting slit tube. Furthermore, the assembled length of this structure can be adjusted according to actual needs, providing strong adaptability.

[0036] The pre-splitting blasting slitting tube provided in this embodiment can fix the emulsion explosive cartridge using a fixing device, and the specifications and dosage of the emulsion explosive cartridge on the fixing device can be adaptively adjusted according to actual needs. The centering airbag on the joint is used for flexible centering during drilling, and the open flame extinguishing unit is used to improve safety during blasting.

[0037] Example 2, based on Example 1, the connector 2 is a cylindrical connector, a through hole 4 is provided in the middle of the connector 2, and at least two airbag accommodating cavities 5 are provided circumferentially inside the connector 2. In this embodiment, preferably, two airbag accommodating cavities are provided on each connector, which are centrally symmetrically provided on the side wall of the connector. A release opening 6 is provided on the side wall of the connector 2, which is connected to the airbag accommodating cavity 5. The size of the release opening is smaller than the airbag accommodating cavity, so that the centering airbag can be fixed. An airbag propulsion port 7 is provided at one end of the connector 2, which is connected to the airbag accommodating cavity 5. During assembly, the centering airbag or the fire extinguishing unit is installed into the airbag accommodating cavity from the airbag propulsion port. A net bag connecting rod 8 for connecting to the fixing device is provided in the through hole 4. In this embodiment, the two ends of the net bag connecting rod are fixedly connected to the inner wall of the through hole.

[0038] Furthermore, the centering airbag 3 includes a soft bladder 9, which houses a gas generator, positioned corresponding to the release opening 6. The fire extinguishing unit includes a thin film-shaped water bag 10 filled with water. Both the water bag 10 and the soft bladder 9 are removable and can be installed within the airbag housing 5. The airbag housing 5 is an annular cavity, suitable for opening in the sidewall of a cylindrical joint.

[0039] As an optional solution, the airbag accommodating cavity 5 on the connector where the open flame extinguishing unit is installed is larger than the airbag accommodating cavity 5 of other connectors where the centering airbag is installed, so as to accommodate a water bag containing more water, thereby achieving a better open flame protection effect and achieving a safety purpose.

[0040] like Figure 5 、 6 As shown in , Example 3, on the basis of Example 2, the gas generator includes a structural frame 30 connected to the inner wall of the soft capsule 9 on one side, a water-soluble film 31 is provided on the other side of the structural frame 30, an isolation membrane 32 is provided in the middle of the structural frame 30, and the structural frame 30 between the isolation membrane 32 and the soft capsule 9 is filled with dilute hydrochloric acid. The inner wall of the soft capsule 9 is fixedly provided with a puncture structure that slides with the structural frame 30 and corresponds to the isolation membrane 32. The puncture structure is located on the inner side of the structural frame 30, and calcium carbonate powder is provided in the soft capsule 9.

[0041] The puncture structure includes a mounting frame 33 fixedly connected to the soft bladder 9. Sliders 34 are connected to both ends of the mounting frame 33. A slot 35 is provided on the structural frame 30 between the isolation membrane 32 and the soft bladder 9, which slidably engages with the slides 34. Several spikes 36 are provided on the side of the mounting frame 33 corresponding to the isolation membrane 32. In this embodiment, the isolation membrane is preferably a thin, hard plastic film. This film is not only resistant to deformation, preventing accidental puncture and leakage caused by spikes during storage, but also allows for easy penetration by the spikes during use.

[0042] To trigger the gas generator, the soft capsule located at the mounting frame is pressed, pushing the mounting frame toward the isolation membrane guided by the slider and the chute. When the slider connected to the mounting frame slides to the end of the chute, the spikes 36 penetrate the isolation membrane, releasing the soft capsule. The chute then resets the mounting frame and the slider, pushing the spikes away from the isolation membrane, leaving several holes in the membrane. The dilute hydrochloric acid between the isolation membrane and the soft capsule then flows through the holes in the isolation membrane and into the space between the isolation membrane and the water-soluble membrane. In this embodiment, the solubility of the water-soluble film is related to its thickness and temperature. Taking a 25 μm thick film as an example, the dissolution time at 20°C is ≤300 seconds, at 30°C it is ≤50 seconds, and at 40°C it is ≤30 seconds. The water-soluble film can be a PVA water-soluble film. In actual use, water-soluble films of different thicknesses can be selected based on the required dissolution time. In this embodiment, a 25 μm thick film with a dissolution time of 30-50 seconds is preferred. This dissolution time of 30-50 seconds satisfies the time requirement for the entire pre-splitting blasting slit tube to be inserted into the blasting borehole after the gas generator is triggered. After the aqueous solvent in the dilute hydrochloric acid dissolves, the dilute hydrochloric acid reacts with the calcium carbonate powder within the soft bladder, generating carbon dioxide gas. This in turn causes the soft bladder to expand, which gradually expands through the release opening 6 toward the borehole wall and the outer wall of the joint, ultimately securing the entire pre-splitting blasting slit tube. The soft bladders on both sides of the joint expand to the same degree and synchronously, thus achieving centering.

[0043] like Figure 8 As shown in Example 4, based on Example 3, grooves 11 are formed on both ends of the sidewalls of the connector 2. The engaging structure includes a block 12 hinged to one side of the groove 11. The groove 11 can accommodate the block 12, and a spring 13 is provided between the block 12 and the bottom of the groove 11. In this embodiment, an annular engaging groove 14 is provided at both ends of the slit pipe 1, corresponding to the block 12. The block 12 is a triangular block, and the cross-sectional structure of the annular engaging groove 14 is an isosceles triangle. The triangular block and the annular engaging groove with a corresponding cross-sectional shape enable direct insertion when the connector and the slit pipe are connected. During the insertion process, the block is pressed from the hinged end into the groove 11, at which time the spring is compressed. As the insertion continues, the block aligns with the annular groove, and the spring acts to cause the block to spring up along the hinged portion, thereby engaging the annular groove and securing the connector to the slit pipe. When disassembly is required, the joint and the slit pipe move in opposite directions. When the external force applied is greater than the clamping force between the clamping block and the annular groove, the annular groove cooperates with the non-hinged side of the clamping block to press the clamping block into the groove 11 again, finally realizing the separation of the joint and the slit pipe.

[0044] In addition, if Figure 9 、 10As shown in Figures 1 and 11, two groups of prefabricated holes 15 or two long prefabricated slits 16 are correspondingly opened on the side wall of the slotted pipe 1. The prefabricated holes or prefabricated slits can control the detonation direction and ability of the explosive energy, thereby forming a good slot surface along the direction of the prefabricated slits or prefabricated holes.

[0045] like Figure 12 As shown, Example 5, based on Example 4, features a fixing device comprising a net bag 17. The net bag can accommodate emulsion explosive rolls of varying lengths and diameters. The ends of the net bag 17 are removably connected to the net bag connecting rods 8 on two adjacent joints 2. Several elastic plastic ropes 18 are attached to the net bag 17, dividing it into several fixed sections. Emulsion explosive rolls 19 are positioned within the corresponding net bags in the fixed sections, with the elastic plastic ropes 18 controlling the position and spacing of the emulsion explosive rolls 19. Detonating cords 20 connect adjacent emulsion explosive rolls 19 and the emulsion explosive rolls 19 on either side of the joint 2. The detonating cords 20 between the emulsion explosive rolls 19 on either side of the joint 2 are located within the through-hole 4. The provision of detonating cords provides a detonating connection.

[0046] In this embodiment, conventional emulsion explosive rolls are available in three lengths: 200mm, 300mm, and 400mm. Depending on the blasting borehole and the hardness of the rock formation at different depths within the blasting borehole, different emulsion explosive rolls of varying sizes are loaded into the net bag at different locations. The position of the elastic plastic rope on the net bag is fine-tuned based on the actual amount of explosive required, thereby fine-tuning the position of the emulsion explosive roll. This allows for flexible and controllable blasting effects and adapts to different needs, achieving a larger charge in hard rock formations and a relatively smaller charge in soft rock formations. Once installed, the emulsion explosive roll, under the influence of the net bag, can be centered within the slit pipe, resulting in a more effective blasting effect.

[0047] Example 6, a method for using the pre-splitting blasting slotted pipe of the above embodiment, comprising the following steps:

[0048] Preparation: Select the specifications and dosage of emulsion explosive cartridges 19 based on the desired rock formation hardness for pre-splitting blasting. Prepare the required number of slotted pipes 1, the corresponding number of connectors 2, and the total amount of emulsion explosive cartridges 19 based on the desired pre-splitting blasting borehole depth. Install the flame extinguishing unit on one of the connectors 2. During installation, push the water bag 10 into the connector's airbag accommodating cavity 5 through the airbag propulsion port 7. Install the centering airbags 3 on the remaining connectors 2. When installing the centering airbags, similarly push them into the airbag accommodating cavity through the airbag propulsion port. Simultaneously, position the puncture structure corresponding to the release opening 6.

[0049] Assembly process: Several selected emulsion explosive rolls 19 are sequentially loaded into the net bag 17. Detonating cords are used to connect the emulsion explosive rolls, and elastic plastic cords 18 are tied to the outside of the net bag 17. The elastic plastic cords 18 are adjusted along the length of the net bag 17 to restrict the position of the emulsion explosive rolls 19 to meet the required amount of explosives. The net bag 17 is inserted into the slit pipe 1, and both ends of the net bag 17 are connected to the connectors 2 placed at both ends of the slit pipe 1. The connectors 2 are plugged into the ends of the slit pipe 1. The remaining slit pipes 1, connectors 2, and net bag 17 are sequentially connected. The emulsion explosive rolls on both sides of the connector are connected via detonating cords to form a pre-splitting blasting slit pipe. A connector 2 equipped with a flame extinguishing unit is installed at one end. The airbag push port of the connector is preferably positioned in the opposite direction to better transmit the blasting shock to the water bag during blasting, thereby causing the water bag to rupture and release water through the release opening and airbag push port.

[0050] Installation process: Based on actual needs, prepare an additional section of slit pipe 1 and connect it to the joint 2 where the fire extinguishing unit is located. Adjust the angle of the pre-splitting blasting slit pipe to adjust the slit direction. Insert the pre-splitting blasting slit pipe vertically into the blasting borehole. While inserting, trigger the centering airbags 3 in the joint 2 one by one, and insert the end with the fire extinguishing unit last. After a delay after insertion, the centering airbag 3 begins to expand and contact the side wall of the blasting borehole, achieving centering and fixing of the pre-splitting blasting slit pipe. After the centering airbag 3 expands to center and fix the pre-splitting blasting slit pipe, remove the top section of slit pipe 1 from the joint 2 containing the fire extinguishing unit, thereby forming a sealed section between the fire extinguishing unit and the blasting borehole opening.

[0051] Blasting process: The emulsion explosive cartridge 19 is detonated, and a good cutting surface is formed on the blasting borehole wall under the action of the cutting pipe 1.

[0052] During the installation process of this method, an additional slitting pipe is connected to replace the traditional blasting stick. When it is separated from the joint, due to the mesh bag connected to the lower part of the joint, the weight of the mesh bag and the clamping structure below the joint make it possible for the slitting pipe to be separated only at the clamping structure where it is connected to the joint when it is pulled out, and not at the clamping structure between the joint and the slitting pipe below. This method provides an assembly and use method for a blasting slitting pipe, which can adapt to the needs of blasting drilling holes of different lengths. The assembly process is simple, and the assembly matching scheme is flexible and highly adaptable. The blasting slitting process performed using this method is highly safe and has a good blasting slitting effect.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pre-splitting blasting seam pipe, characterized by: The invention comprises a plurality of slit pipe sections (1), wherein the slit pipe sections (1) are connected by joints (2), the two ends of the joints (2) are respectively plugged into the two slit pipe sections (1) and matched with each other through a clamping structure, and the adjacent joints (2) are connected by a fixing device provided inside the slit pipe section (1), and the fixing device is provided with a plurality of emulsion explosive rolls (19) with adjustable spacing; one of the joints (2) located at the end is provided with a fire extinguishing unit, and the other joints (2) are provided with at least two centering air bags (3); the joint (2) is a cylindrical joint, a through hole (4) is provided in the middle of the joint (2), and the joint (2) is provided with a through hole (4) along the inside. At least two airbag accommodating chambers (5) for storing centering airbags (3) or fire extinguishing units are provided in the circumferential direction; a release opening (6) communicating with the airbag accommodating chamber (5) is provided on the side wall of the joint (2); an airbag propulsion port (7) communicating with the airbag accommodating chamber (5) is provided at one end of the joint (2); a net bag connecting rod (8) for connecting with a fixing device is provided in the through hole (4); the centering airbag (3) includes a soft bag body (9), a gas generator is provided in the soft bag body (9), and the gas generator is provided corresponding to the release opening (6); the airbag accommodating chamber (5) is an annular cavity, and the gas generator includes a side A structural frame (30) is connected to the inner wall of the soft capsule (9), a water-soluble film (31) is provided on the other side of the structural frame (30), an isolation film (32) is provided in the middle of the structural frame (30), the structural frame (30) between the isolation film (32) and the soft capsule (9) is filled with dilute hydrochloric acid, a puncture structure is fixedly provided on the inner wall of the soft capsule (9) and is slidably matched with the structural frame (30) and corresponding to the isolation film (32), the puncture structure is located on the inner side of the structural frame (30), and calcium carbonate powder is provided in the soft capsule (9); the fixing device includes a net bag (17), and the two ends of the net bag (17) are respectively connected by a net bag connecting rod (8) The net bag (17) is detachably connected to the corresponding joint (2), and a plurality of elastic plastic ropes (18) are tied to the net bag (17) and the net bag (17) is divided into a plurality of fixed parts by the plurality of elastic plastic ropes (18). The emulsion explosive rolls (19) are arranged in the net bag corresponding to the fixed parts, and the positions and spacings of the emulsion explosive rolls (19) are limited by the elastic plastic ropes (18); adjacent emulsion explosive rolls (19) and the emulsion explosive rolls (19) on both sides of the joint (2) are connected by detonating cords (20), and the detonating cords (20) between the emulsion explosive rolls (19) on both sides of the joint (2) are arranged in the through hole (4).

2. The pre-splitting blasting slotted pipe according to claim 1, characterized in that: The fire extinguishing unit comprises a film-shaped water bag (10), the interior of the water bag (10) being filled with water; the water bag (10) and the soft bladder body (9) are both detachable and arranged in the air bag accommodating cavity (5).

3. The pre-splitting blasting slotted pipe according to claim 2, characterized in that: The puncture structure includes a mounting frame (33) fixedly connected to the soft capsule (9), with sliders (34) connected to both ends of the mounting frame (33), a sliding groove (35) slidably engaged with the slider (34) provided on the structural frame (30) between the isolation membrane (32) and the soft capsule (9), and a plurality of spikes (36) provided on one side of the mounting frame (33) corresponding to the isolation membrane (32).

4. The pre-splitting blasting slotted pipe according to any one of claims 1 to 3, characterized in that: Both ends of the side wall of the joint (2) are provided with grooves (11), and the clamping structure includes a clamping block (12) hinged on one side of the groove (11). The groove (11) can accommodate the clamping block (12), and a spring (13) is provided between the clamping block (12) and the bottom of the groove (11).

5. The pre-splitting blasting slotted pipe according to claim 4, characterized in that: Both ends of the slit pipe (1) are provided with an annular clamping groove (14) corresponding to the clamping block (12); the clamping block (12) is a triangular clamping block; the groove cross-section structure of the annular clamping groove (14) is an isosceles triangle; and the side wall of the slit pipe (1) is correspondingly provided with two groups of prefabricated holes (15) or two long strip-shaped prefabricated slits (16).

6. A method for using the pre-splitting blasting seam pipe according to any one of claims 1 to 5, characterized in that: The following steps are involved: Preparation: Select the specifications and dosage of the emulsion explosive cartridge (19) according to the hardness of the rock formation to be pre-splitting blasted, prepare the required number of slotted pipes (1), the corresponding number of joints (2) and the total dosage of the emulsion explosive cartridge (19) according to the required blasting drilling depth of the pre-splitting blasting, install a flame extinguishing unit on one of the joints (2), and install a centering air bag (3) on the remaining joints (2); Assembly process: several selected emulsion explosive rolls (19) are sequentially loaded into the net bag (17), and the elastic plastic rope (18) is tied to the outside of the net bag (17), and the position of the elastic plastic rope (18) in the length direction of the net bag (17) is adjusted to limit the position of the emulsion explosive roll (19) to meet the amount of explosives used; the net bag (17) is inserted into the slit pipe (1), and both ends of the net bag (17) are connected to the joints (2) placed at both ends of the slit pipe (1), and the joints (2) are plugged into the end of the slit pipe (1), and the remaining slit pipes (1), joints (2), and net bag (17) are sequentially connected to form a pre-splitting blasting slit pipe, and the joint (2) equipped with the open flame extinguishing unit is arranged at one end; Installation process: adjust the angle of the pre-splitting blasting slit tube to adjust the slit direction, insert the pre-splitting blasting slit tube vertically into the blasting borehole, trigger the centering airbags (3) in the joint (2) one by one while inserting, and insert the end with the flame extinguishing unit last. After a delay period after insertion, the centering airbag (3) begins to expand and contacts the side wall of the blasting borehole, thereby achieving the centering and fixing of the pre-splitting blasting slit tube; Blasting process: The emulsion explosive cartridge (19) is detonated, and a good cutting surface is formed on the blasting borehole wall under the action of the cutting pipe (1).

7. The method of use according to claim 6, characterized in that: The installation process also includes the following steps: preparing a section of slit pipe (1) and connecting it to the joint (2) where the fire extinguishing unit is located, then inserting the pre-splitting blasting slit pipe into the blasting drill hole, and after the centering air bag (3) is expanded to center and fix the pre-splitting blasting slit pipe, the uppermost section of the slit pipe (1) is removed from the joint (2) containing the fire extinguishing unit, thereby forming a sealing section between the fire extinguishing unit and the blasting drill hole.

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