Weak blasting device and method for large-section close-range double-line tunnel rapid construction

Abstract

The application relates to the technical field of tunnel blasting engineering, in particular to a weak blasting device and method for rapid construction of large-section close double-line tunnels, which comprises a movable base, the upper surface of the movable base is fixed with a hydraulic cylinder, the top end surface of the piston rod of the hydraulic cylinder is supported with an arch-shaped guide rail through a supporting block, an arc-shaped sliding groove is formed in the front side surface of the arch-shaped guide rail, an arc-shaped gear rack is fixedly arranged in the arc-shaped sliding groove, a gear column is inserted into the arc-shaped sliding groove, the gear column is in surface meshing transmission with the arc-shaped gear rack, the outer end surface of the gear column is rotationally connected with a fixed plate through a rotating rod, the rear side surface of the fixed plate is fixed with an arc-shaped sliding block, the front side surface of the arc-shaped sliding block is fixed with a semicircular guide rail, and a pushing assembly is slidably arranged on the semicircular guide rail; the weak blasting device and method can conveniently and safely continue to place multiple blasting pipes into different blast holes, so that construction personnel can quickly and safely perform blasting construction on large-section close double-line tunnels.

Description

Technical Field

[0001] This invention relates to the field of tunnel blasting engineering technology, specifically to a weak blasting device and method for rapid construction of large-section, close-range, double-track tunnels. Background Technology

[0002] Currently, with the rapid development of my country's economy, the construction of highways and railways is increasing, and large-section tunnels are emerging one after another. These tunnels pass through bustling cities, and the tunnels are relatively shallow with many buildings on the surface. When tunnels are excavated by blasting, while ensuring high-quality excavation sections and advance, it is necessary to control the blasting vibration within the allowable range to ensure the safety of the surface and buildings, and at the same time reduce the impact of blasting vibration on the surrounding population.

[0003] For example, the patent application number CN201911299649.7, entitled "Weak Vibration Blasting Charge Device and Its Usage Method", includes multiple sections of cylindrical damping tubes, reinforcing rings, and mounting rods. Each section of the cylindrical damping tube is composed of two damping plates spliced ​​together, and the cylindrical damping tube has two symmetrical notches. The damping plates are made of flexible material on the outside and rigid shaping material in the middle. The reinforcing rings are evenly spaced outside the cylindrical damping tubes. The mounting rod is a hollow straight rod with hook-shaped protrusions evenly spaced on it.

[0004] When rapid blasting is required for large-section, closely spaced twin tunnels, the proximity between the two tunnels necessitates the use of conventional blasting devices, as this would impact the other tunnel. Therefore, blasting tubes with vibration-damping capabilities are required. Since numerous boreholes are drilled in the tunnel face, the usual method for inserting blasting tubes into these holes involves workers using ladders or erecting scaffolding inside the tunnel to sequentially install multiple tubes. This method inevitably reduces the efficiency of tunnel blasting and poses safety hazards to workers. Summary of the Invention

[0005] The purpose of this invention is to provide a weak blasting device and method for rapid construction of large-section, close-distance, dual-track tunnels, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a weak blasting device for rapid construction of large-section, close-range double-track tunnels, comprising a movable base, wherein at least two hydraulic cylinders are fixed on the upper surface of the movable base, and the top surfaces of the piston rods of the two hydraulic cylinders are supported by an arched guide rail via a support block. A sliding deployment mechanism is provided on the arched guide rail, which is used to deploy blasting tubes with weak vibration function into the blast hole, facilitating weak blasting construction of double-track tunnels by construction personnel.

[0007] Preferably, the sliding delivery mechanism includes an arc-shaped rack, a gear column, a fixed plate, an arc-shaped slider, a positioning baffle, a semi-circular guide rail, and a pushing assembly. The front side of the arched guide rail has an arc-shaped groove, and an arc-shaped rack is fixedly installed within the arc-shaped groove. A gear column is inserted into the arc-shaped groove, and the gear column meshes with the upper surface of the arc-shaped rack. The outer end face of the gear column is rotatably connected to the fixed plate via a rotating rod, and a drive motor connected to the rotating rod is fixed to the outer side of the fixed plate. An arc-shaped slider is fixed to the rear side of the fixed plate, and the lower surface of the arc-shaped slider is in contact with the upper surface of the arched guide rail. A positioning baffle is fixed to the rear side of the arc-shaped slider, and the positioning baffle slides against the rear side of the arched guide rail. A semi-circular guide rail is fixed to the front side of the arc-shaped slider, and a pushing assembly is slidably installed on the semi-circular guide rail. The pushing assembly is used to push the blasting tube slidably installed on the semi-circular guide rail into the blast hole.

[0008] Preferably, the push assembly includes a mounting strip, a rotating lead screw, a lead screw slider, a push plate, and a push rod. The mounting strip is fixed to the lower surface of the semi-circular guide rail, and a sliding guide groove is opened in the front and rear horizontal directions of the mounting strip. A rotating lead screw is rotatably arranged in the sliding guide groove. The rotating lead screw is connected to the output shaft of a drive motor fixedly arranged in the arc-shaped slider. A lead screw slider is sleeved on the rotating lead screw using a lead screw nut. A push plate is fixed to the upper surface of the lead screw slider, and the push plate is slidably arranged in the semi-circular guide rail. A push rod is fixed to the front side of the push plate.

[0009] Preferably, the push rod has a hollow structure inside, and the outer ring surface of the head of the push rod is provided with multiple guide holes. The rear end face of the hollow push rod is fixed with an elastic conduit, and the elastic conduit is connected to the blasting mud plugging device that moves inside the tunnel.

[0010] Preferably, a toggle blocking assembly is provided inside the semicircular guide rail. The toggle blocking assembly includes an arc-shaped stop bar, an elastic bar, a sealing plate, and a toggle bar. Multiple shrinkage grooves are arrayed inside the semicircular guide rail along its length direction, and an arc-shaped stop bar is slidably disposed in each shrinkage groove. The bottom end face of the arc-shaped stop bar is slidably connected to the bottom of the shrinkage groove through an elastic bar. A sealing plate is fixed to the outer side of the shrinkage groove. The outer sides of multiple arc-shaped stop bars close to the same side are connected by a toggle bar.

[0011] Preferably, the toggle blocking assembly further includes elastic protrusions, the upper surface of the semi-circular guide rail is provided with multiple engaging grooves, the lower surface of the toggle bar is fixed with multiple elastic protrusions, and each elastic protrusion slides into the engaging groove.

[0012] A weak blasting method for rapid construction of large-section, close-range, double-track tunnels is disclosed. This blasting method is applicable to the weak blasting device described above for rapid construction of large-section, close-range, double-track tunnels using weak blasting.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This invention features a sliding delivery mechanism on an arched guide rail. The meshing transmission between the gear column and the arc-shaped rack inside the arched guide rail drives the arc-shaped slider to slide in an arc on the arched guide rail. This allows the blasting tubes placed on the semi-circular guide rail to slide to the corresponding blast hole position. Then, the jacking assembly is controlled to slide on the semi-circular guide rail, which facilitates the jacking assembly to push the blasting tubes into the blast hole. Furthermore, through the upward sliding of the arched guide rail and the arc-shaped sliding of the semi-circular guide rail, it is easy to safely deliver multiple blasting tubes to different blast holes. This allows construction personnel to quickly and safely carry out blasting construction on large-section, close-range double-track tunnels.

[0015] 2. This invention features a toggle blocking assembly on a semi-circular guide rail. When the blasting tube needs to be placed onto the semi-circular guide rail, the operator moves the toggle bars on both sides, causing multiple arc-shaped blocking bars to retract into the contraction groove. At this time, the elastic strip is in a compressed state. Then, the operator places the blasting tube onto the semi-circular guide rail, ensuring its tail contacts the end face of the push rod. The operator then releases the toggle bars, allowing the arc-shaped blocking bars to slide out of the contraction groove under the push of the elastic strip. This facilitates the insertion of the multiple arc-shaped blocking bars into the blasting tube within the semi-circular guide rail for blocking, preventing the blasting tube from falling off the semi-circular guide rail when it slides in an arc on the arched guide rail, thus affecting the safe use of the blasting tube. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the sliding delivery mechanism of the present invention;

[0018] Figure 3 This is a cross-sectional view of the semi-circular guide rail of the present invention.

[0019] In the diagram: 1. Movable base; 2. Hydraulic cylinder; 3. Arched guide rail; 31. Arc-shaped slide groove; 4. Sliding dispensing mechanism; 41. Arc-shaped rack; 42. Gear column; 43. Fixing plate; 44. Arc-shaped slider; 45. Positioning baffle; 46. Semi-circular guide rail; 461. Shrinkage groove; 462. Engaging groove; 5. Pushing assembly; 51. Mounting strip; 511. Sliding guide groove; 52. Rotating screw; 53. Screw slider; 54. Pushing plate; 55. Pushing rod; 551. Guide hole; 56. Elastic guide tube; 6. Actuating blocking assembly; 61. Arc-shaped baffle; 62. Elastic strip; 63. Sealing plate; 64. Actuating strip; 65. Elastic protrusion. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1:

[0022] like Figures 1 to 3As shown, this invention provides a technical solution for a weak blasting device and method for rapid construction of large-section, closely spaced double-track tunnels: It includes a movable base 1, with at least two hydraulic cylinders 2 fixed to the upper surface of the movable base 1. The piston rods of the two hydraulic cylinders 2 are supported by arched guide rails 3 via support blocks. A sliding deployment mechanism 4 is provided on the arched guide rails 3. The sliding deployment mechanism 4 is used to deploy blasting tubes with weak vibration function into the blast holes, facilitating weak blasting construction of the double-track tunnels by construction personnel. This invention addresses the need for rapid blasting construction of large-section, closely spaced double-track tunnels, where the distance between the two tunnels is relatively short. Therefore, if a weak blasting device is used... Common blasting devices used in blasting operations can affect other tunnels. Therefore, blasting tubes with low-vibration capability are needed. Since there are many blast holes drilled on the tunnel face, the usual method for placing blasting tubes into these holes involves workers using ladders or erecting scaffolding inside the tunnel to install multiple tubes sequentially. This method inevitably affects the efficiency of tunnel blasting and poses safety hazards to workers. Therefore, this invention addresses this issue by allowing workers to first move a movable base 1 into the tunnel when placing blasting tubes with low-vibration capability into the blast holes. The piston rods of the two hydraulic cylinders 2 are controlled to retract, causing the arched guide rail 3 to descend to its lowest position. At this point, construction workers can install multiple sets of sliding delivery mechanisms 4 on the arched guide rail 3 as needed. Then, the construction workers place the required blasting tubes sequentially onto the sliding delivery mechanisms 4 slidably installed on the arched guide rail 3. At this time, the piston rods of the hydraulic cylinders 2 extend, causing them to move through the arched guide rail 3 and drive the sliding delivery mechanisms 4 to move above the tunnel blasting face. Then, by moving the sliding delivery mechanisms 4 on the arched guide rail 3, multiple blasting tubes can be aligned with multiple blast holes respectively. Finally, controlling the sliding delivery mechanisms 4 can drop the blasting tubes into the blast holes. After multiple blasting tubes are dropped into the blast holes... At this time, the sliding delivery mechanism 4 is retracted, and the piston rod of the hydraulic cylinder 2 retracts, which can drive the arched guide rail 3 to descend to the lowest position. Then, the construction personnel continue to install the blasting tubes onto the sliding delivery mechanism 4, and then continue to control the arched guide rail 3 to rise to the corresponding position. This allows the construction personnel to quickly place multiple blasting tubes into the blast hole for fixing, and also eliminates the need for the construction personnel to set up scaffolding in the tunnel, thereby reducing the labor intensity of the construction personnel. At the same time, the construction personnel can adjust the size of the arched guide rail 3 according to the cross-sectional size of the tunnel for weak blasting as needed, so that the weak blasting device can adapt to the blasting construction of large-section tunnels.

[0023] Furthermore, the sliding delivery mechanism 4 includes an arc-shaped rack 41, a gear column 42, a fixed plate 43, an arc-shaped slider 44, a positioning baffle 45, a semi-circular guide rail 46, and a pushing assembly 5. An arc-shaped groove 31 is provided on the front side of the arched guide rail 3, and an arc-shaped rack 41 is fixedly installed within the arc-shaped groove 31. The gear column 42 is inserted into the arc-shaped groove 31, and the gear column 42 meshes with the upper surface of the arc-shaped rack 41 for transmission. The outer end face of the gear column 42 is rotatably connected to the fixed plate 43 via a rotating rod, and a drive motor connected to the rotating rod is fixed to the outer side of the fixed plate 43. An arc-shaped slider 44 is fixed to the rear side of the fixed plate 43, and the lower surface of the arc-shaped slider 44 is in contact with the upper surface of the arched guide rail 3. A positioning baffle 45 is fixed to the rear side of the arc-shaped slider 44, and the positioning baffle 45 slides against the rear side of the arched guide rail 3. A semi-circular guide rail 46 is fixed to the front side of the arc-shaped slider 44, and a pushing component 5 is slidably arranged on the semi-circular guide rail 46. The pushing component 5 is used to push the blasting tube slidably arranged on the semi-circular guide rail 46 into the blast hole. In this invention, when the arched guide rail 3 descends to the lowest position, the construction personnel control the drive motor on the outer side of the fixed plate 43 to rotate, so that it drives the gear column 42 to rotate through the rotating rod, thereby allowing the gear column 42 to slide on the arc-shaped rack 41 arranged in the arc-shaped slide groove 31. At this time, the gear column 42 will drive the semi-circular guide rail 46 to move through the arc-shaped slider 44. At the end of the arched guide rail 3, the positioning baffle 45 and the fixing plate 43 cooperate to limit the sliding of the arc-shaped slider 44. Then, the construction workers sequentially place multiple blasting tubes onto multiple semi-circular guide rails 46, so that the tail end of the blasting tube contacts the jacking assembly 5. Then, the construction workers control the piston rod of the hydraulic cylinder 2 to extend, so that it drives multiple blasting tubes to rise to the blast hole at the top of the tunnel section through the arched guide rail 3. Then, the construction workers drive multiple drive motors to rotate in opposite directions, so that they drive multiple arc-shaped sliders 44 to slide along the arched guide rail 3, thereby driving the blasting tubes placed on the multiple semi-circular guide rails 46 to move to the corresponding blast hole positions. Then, the jacking assembly 5 is controlled to slide on the semi-circular guide rail 46, thereby facilitating the jacking assembly. Component 5 pushes the blasting tube into the blast hole. Once the blasting tube is fully inserted, the jacking component 5 moves in the opposite direction and back into the semi-circular guide rail 46. Then, the construction personnel control the piston rod of the hydraulic cylinder 2 to retract, causing it to descend to the lowest position via the arched guide rail 3. Then, driven by the drive motor, the semi-circular guide rails 46 slide to the lowest end face of the arched guide rail 3, making it easier for the construction personnel to place multiple blasting tubes onto the semi-circular guide rails 46. Then, through the upward sliding of the arched guide rail 3 and the arc-shaped sliding of the semi-circular guide rails 46, it is easier to safely place multiple blasting tubes into different blast holes, thus enabling the construction personnel to quickly and safely carry out blasting construction on large-section, close-range double-track tunnels.

[0024] Furthermore, the jacking assembly 5 includes an mounting strip 51, a rotating screw 52, ​​a screw slider 53, a jacking plate 54, and a jacking rod 55. The mounting strip 51 is fixed to the lower surface of the semi-circular guide rail 46, and a sliding guide groove 511 is formed in the front and rear horizontal directions of the mounting strip 51. A rotating screw 52 is rotatably mounted within the sliding guide groove 511. The rotating screw 52 is connected to the output shaft of a drive motor fixed within the arc-shaped slider 44. A screw slider 53 is sleeved on the rotating screw 52 using a screw nut. A jacking plate 54 is fixed to the upper surface of the screw slider 53, and the jacking plate 54 is slidably mounted within the semi-circular guide rail 46. A jacking rod 55 is fixed to the front side of the jacking plate 54. According to this invention, when the construction personnel place the blasting tube into the semi-circular guide rail 46, the blasting... The tail end of the tube contacts the push rod 55, while the head of the blasting tube is flush with or slightly protrudes from the end of the semicircular guide rail 46. When the semicircular guide rail 46 moves to align with the borehole opening, the end of the blasting tube is aligned with the center of the borehole. Then, the drive motor inside the arc-shaped slider 44 is controlled to operate, causing its output shaft to drive the rotating screw 52 to rotate. The screw and slider then drive the push plate 54 to slide towards the end face of the semicircular guide rail 46. At this time, the moving push plate 54 pushes the blasting tube inside the semicircular guide rail 46 into the borehole through the push rod 55. When the blasting tube is fully inserted into the borehole, the drive rotating screw 52 rotates in the opposite direction, causing it to slide the push rod near the side of the arc-shaped slider 44 through the push plate 54, thus facilitating the quick installation of the blasting tube into the borehole.

[0025] Furthermore, the push rod 55 has a hollow internal structure, and its head outer surface is provided with multiple guide holes 551. An elastic conduit 56 is fixed to the rear end face of the hollow push rod 55, and the elastic conduit 56 is connected to the moving mud-blocking device inside the tunnel. According to this invention, after the push rod 55 pushes the blasting pipe completely into the blast hole, the construction personnel can then input the blockage mud into the elastic conduit 56, allowing the mud to enter the hollow push rod 55 through the elastic conduit 56, and then flow through the multiple guide holes 551. 1. The blasting material is continuously injected into the blast hole, which facilitates the sealing of the blast hole opening. As the blasting material continues to enter the blast hole, the push rod 55 will be continuously pushed out of the blast hole, so that the push rod 55 will not interfere with or affect the blocked blasting material. After the blasting tube is pushed into the blast hole, the hollow push rod 55 can guide the blasting material to the blast hole opening, thereby sealing the blast hole opening. There is no need for construction personnel to manually seal the blast hole, which can further improve the speed of blasting in tunnel construction using weak blasting devices.

[0026] Furthermore, a toggle blocking assembly 6 is provided inside the semicircular guide rail 46. The toggle blocking assembly 6 includes an arc-shaped baffle 61, an elastic strip 62, a sealing plate 63, and a toggle strip 64. Multiple contraction grooves 461 are arrayed along the length of the semicircular guide rail 46, and an arc-shaped baffle 61 is slidably disposed within each contraction groove 461. The bottom end face of the arc-shaped baffle 61 is slidably connected to the bottom of the contraction groove 461 via the elastic strip 62. A sealing plate 63 is fixed to the outer side of the contraction groove 461. The outer sides of multiple arc-shaped baffles 61 near the same side are connected by a toggle strip 64. This invention is designed to prevent the semicircular guide rail 46 from sliding on the arched guide rail 3, thus preventing the rupture tube from sliding off the semicircular guide rail 46. If the blasting tube falls from the semicircular guide rail 46, when it is necessary to place the blasting tube onto the semicircular guide rail 46, the construction worker will move the actuating strips 64 on both sides, causing multiple arc-shaped baffles 61 to retract into the contraction groove 461. At this time, the elastic strip 62 is in a compressed state. Then, the construction worker will place the blasting tube onto the semicircular guide rail 46, so that its tail contacts the end face of the push rod 55. Then, the actuating strips 64 will be released, allowing the arc-shaped baffles 61 to slide out from the contraction groove 461 under the push of the elastic strip 62. This will allow the multiple arc-shaped baffles 61 to be inserted into the blasting tube in the semicircular guide rail 46 to block it, preventing the blasting tube from falling off the semicircular guide rail 46 when the semicircular guide rail 46 slides in an arc on the arched guide rail 3, thus affecting the safe use of the blasting tube.

[0027] Furthermore, the actuating blocking assembly 6 also includes elastic protrusions 65. The upper surface of the semi-circular guide rail 46 is provided with multiple engaging grooves 462, and the lower surface of the actuating bar 64 is fixed with multiple elastic protrusions 65, each elastic protrusion 65 slidingly engaging into the engaging groove 462. According to this invention, when the actuating bar 64 drives multiple arc-shaped blocking bars 61 to retract into the retraction groove 461, the elastic protrusions 65 on the bottom end face of the actuating bar 64 will squeeze and engage into the engaging groove 462. The blasting tube is placed in the groove 462, which facilitates the fixing of the actuating strip 64. This allows the construction personnel to stably place the blasting tube into the semi-circular guide rail 46. Once the blasting tube is stably placed into the semi-circular guide rail 46, the construction personnel can then pull the actuating strip 64 upwards, causing the elastic protrusion 65 to disengage from the groove 462. This allows the compressed elastic strip 62 to push multiple arc-shaped baffles 61 out of the shrinkage groove 461, thus facilitating the fixing of the blasting tube by the multiple arc-shaped baffles 61.

[0028] A weak blasting method for rapid construction of large-section, close-range, double-track tunnels is disclosed. This blasting method is applicable to the weak blasting device described above for rapid construction of large-section, close-range, double-track tunnels using weak blasting.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A weak blasting device for rapid construction of large-section, close-range, dual-track tunnels, comprising a movable base (1), characterized in that, At least two hydraulic cylinders (2) are fixed on the upper surface of the mobile base (1), and the top surface of the piston rod of the two hydraulic cylinders (2) is supported by an arched guide rail (3) through a support block. A sliding delivery mechanism (4) is provided on the arched guide rail (3). The sliding delivery mechanism (4) is used to deliver the blasting pipe with weak vibration function into the blast hole, which facilitates the construction personnel to carry out weak blasting construction on the double-line tunnel. The sliding delivery mechanism (4) includes an arc-shaped rack (41), a gear column (42), a fixed plate (43), an arc-shaped slider (44), a positioning baffle (45), a semi-circular guide rail (46), and a pushing assembly (5). The front side of the arched guide rail (3) is provided with an arc-shaped groove (31), and an arc-shaped rack (41) is fixedly installed in the arc-shaped groove (31). A gear column (42) is inserted into the arc-shaped groove (31), and the gear column (42) meshes with the upper surface of the arc-shaped rack (41). The outer end face of the gear column (42) is rotatably connected to the fixed plate (43) through a rotating rod. A drive motor connected to the rotating rod is fixed on the outer side of the fixed plate (43). An arc-shaped slider (44) is fixed on the rear side of the fixed plate (43), and the lower surface of the arc-shaped slider (44) is in contact with the upper surface of the arched guide rail (3). A positioning baffle (45) is fixed on the rear side of the arc-shaped slider (44), and the positioning baffle (45) slides against the rear side of the arched guide rail (3). A semi-circular guide rail (46) is fixed on the front side of the arc-shaped slider (44), and a push assembly (5) is slidably arranged on the semi-circular guide rail (46). The push assembly (5) is used to push the blasting tube slidably arranged on the semi-circular guide rail (46) into the blast hole. The push assembly (5) includes a mounting strip (51), a rotating screw (52), a screw slider (53), a push plate (54), and a push rod (55). The mounting strip (51) is fixed on the lower surface of the semicircular guide rail (46), and a sliding guide groove (511) is opened in the front and rear horizontal direction of the mounting strip (51). The rotating screw (52) is rotatably arranged in the sliding guide groove (511). The rotating screw (52) is connected to the output shaft of the drive motor fixedly arranged in the arc-shaped slider (44). The screw slider (53) is sleeved on the rotating screw (52) with a screw nut. The push plate (54) is fixed on the upper surface of the screw slider (53), and the push plate (54) is slidably arranged in the semicircular guide rail (46). The push rod (55) is fixed on the front side of the push plate (54). The semicircular guide rail (46) is provided with a toggle blocking assembly (6). The toggle blocking assembly (6) includes an arc-shaped stop bar (61), an elastic bar (62), a sealing plate (63), and a toggle bar (64). Multiple shrinkage grooves (461) are arrayed along the length of the semicircular guide rail (46), and an arc-shaped stop bar (61) is slidably arranged in each shrinkage groove (461). The bottom end face of the arc-shaped stop bar (61) is slidably connected to the bottom of the shrinkage groove (461) through the elastic bar (62). The outer side of the shrinkage groove (461) is fixed with a sealing plate (63). The outer sides of multiple arc-shaped stop bars (61) close to the same side are connected by a toggle bar (64).

2. The weak blasting device for rapid construction of large-section, close-range, dual-track tunnels according to claim 1, characterized in that: The push rod (55) has a hollow structure inside, and the outer ring of the head of the push rod (55) is provided with multiple guide holes (551). The rear end face of the hollow push rod (55) is fixed with an elastic conduit (56), and the elastic conduit (56) is connected to the blasting mud plugging device that moves inside the tunnel.

3. The weak blasting device for rapid construction of large-section, close-range, dual-track tunnels according to claim 1, characterized in that: The toggle blocking assembly (6) also includes elastic protrusions (65). The upper surface of the semi-circular guide rail (46) is provided with multiple engaging grooves (462). The lower surface of the toggle bar (64) is fixed with multiple elastic protrusions (65), and each elastic protrusion (65) slides into the engaging groove (462).

4. A weak blasting method for rapid construction of large-section, close-range, dual-track tunnels, characterized in that: This blasting method is applicable to the use of the weak blasting device described in any one of claims 1 to 3 for rapid construction of large-section, close-range double-track tunnels with weak blasting.

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