A tunnel blasting flyrock protection device and construction method

Abstract

This invention belongs to the field of tunnel blasting protection technology, specifically a tunnel blasting fly rock protection device and construction method. It includes installing connecting rods, with the first and last ends of multiple connecting rods connected end-to-end to form a ring-shaped whole. The outer surface of the ring-shaped whole is adapted to the inner wall of the tunnel. The multiple connecting rods are divided into two ring-shaped wholes and installed front and rearward. This tunnel blasting fly rock protection device and construction method features a portable installation and disassembly mechanism, allowing for multiple uses, convenient installation and disassembly, and high flexibility. A buffer protection mechanism buffers and blocks the flying debris generated after tunnel blasting, preventing injury to equipment and personnel. Furthermore, an anti-impact mechanism and a ventilated guiding mechanism reflect and guide the impact air pressure generated after tunnel blasting, further preventing injury to equipment and personnel.

Description

Technical Field

[0001] This invention relates to the field of tunnel blasting protection technology, and in particular to a tunnel blasting fly rock protection device and construction method. Background Technology

[0002] Existing wave-breaking walls, constructed of concrete or stone, offer some protection against blast shock waves and can effectively prevent tunnel blasting disasters. However, these walls suffer from several problems and drawbacks, including long construction times, difficult dismantling, low material reuse rates, and difficulty in construction in areas with poor rock quality. Furthermore, they are difficult to repair if damaged during use. While rock-retaining walls effectively intercept and reflect rocks ejected during blasting, they offer shorter construction times, simpler dismantling, and easier maintenance. However, they cannot effectively block destructive shock waves, limiting their ability to prevent blasting disasters. Therefore, a tunnel blasting flyrock protection device and its construction method are needed. Summary of the Invention

[0003] Based on existing technical problems, this invention proposes a tunnel blasting fly rock protection device and construction method.

[0004] The present invention proposes a tunnel blasting fly rock protection device, which includes a mounting connecting rod. The first and last ends of multiple mounting connecting rods are connected end to end to form a ring, and the outer surface of the ring is adapted to the inner wall of the tunnel. The multiple mounting connecting rods are divided into two rings and installed in a front-to-back distribution. The outer surface of each ring is fixed to the inner wall of the tunnel by expansion screws.

[0005] The two ring-shaped components are respectively equipped with a portable installation and disassembly mechanism, a buffer protection mechanism, an anti-impact mechanism, and a breathable guiding mechanism.

[0006] The anti-collision mechanism prevents damage from flying rocks after tunnel blasting.

[0007] The buffer protection mechanism enables the buffering and offsetting action of flying rocks impacting the anti-collision mechanism after tunnel blasting.

[0008] The ventilation and guiding mechanism realizes the action of ventilation, guiding and diverting the internal impact pressure after tunnel blasting.

[0009] The portable installation and disassembly mechanism enables the installation, disassembly, and carrying of the buffer protection mechanism, the anti-impact mechanism, and the breathable guiding mechanism.

[0010] Preferably, the portable installation and disassembly mechanism includes a slide rail, and the inner walls of the two annular integrals formed by the plurality of installation connecting rods are provided with installation grooves. The installation grooves on the surfaces of the two annular integrals correspond to each other, and the inner walls of each pair of corresponding installation grooves are respectively engaged with the two ends of the slide rail.

[0011] Preferably, the multiple slide rails are arranged in a curved pattern on the surface of the annular whole, and a limiting ring plate is fixedly installed on one side surface of the multiple mounting connecting rods of one annular whole, while the other side surface of the multiple mounting connecting rods of another annular whole is connected with a buffer barrier plate by screw thread.

[0012] Preferably, a slider is slidably inserted into the surface of the slide rail, and a protective plate is fixedly installed on the surface of every two sliders. The four protective plates are provided with left and right protections in adjacent vertical directions. A U-shaped seat is fixedly installed at one end of each of the two protective plates of the left protection, and an adapter seat is fixedly installed at one end of each of the two protective plates of the right protection. The adapter seat is located inside the U-shape of the U-shaped seat and is engaged with the U-shaped seat and the adapter seat by a pin passing through it.

[0013] Preferably, the four protective plates are provided with upper and lower protection in adjacent horizontal directions. The two upper protective plates have a socket plate fixedly installed on one side of their bottom end, and the two lower protective plates have a hinge seat fixedly installed on one side of their top end. The socket plate is located on top of the hinge seat and is hinged through the socket plate and the hinge seat via a hinge shaft.

[0014] Preferably, the buffer protection mechanism includes guide tubes, and multiple guide tubes are fixedly installed on the opposite surface of the buffer barrier plate. A compression spring is fixedly installed on the inner wall of the guide tube. A buffer rod is slidably inserted into one end of the guide tube. One end of the buffer rod is in contact with one end of the compression spring. One end of each of the four buffer rods is fixedly installed on the surface of the four protective plates.

[0015] Preferably, the anti-collision mechanism includes protrusions, one end of the protrusions is hemispherical, the protrusions are evenly distributed on the surfaces of the four protective plates in the vertical and horizontal directions, the protrusions are welded to the surface of the protective plates, and the protrusions are arranged at varying heights along their length.

[0016] Preferably, the ventilation guiding mechanism includes transverse ventilation holes, longitudinal ventilation holes, and vertical ventilation holes. The plurality of transverse ventilation holes are arranged perpendicularly to the plurality of longitudinal ventilation holes. The plurality of vertical ventilation holes are arranged perpendicularly to the plurality of transverse ventilation holes and the plurality of longitudinal ventilation holes. The plurality of vertical ventilation holes are fixedly connected to the plurality of transverse ventilation holes and the plurality of longitudinal ventilation holes, and the plurality of transverse ventilation holes and the plurality of longitudinal ventilation holes are all through-connected.

[0017] Preferably, the plurality of transverse vents and the plurality of longitudinal vents are all formed in the middle of the thickness of the protective plate, the plurality of vertical vents are formed on one side of the protective plate, and each vent is located in the middle of the four adjacent protrusions.

[0018] The present invention proposes a construction method for a tunnel blasting fly rock protection device. Step 1: Before tunnel blasting, the device is taken out and installed inside the tunnel. Multiple installation connecting rods are installed and fixed to the inner wall of the tunnel by expansion screws, so that they are connected end to end to form a ring. The two rings are controlled to be distributed in a corresponding manner, and the slide rail is engaged with the inner wall of the installation groove of the installation connecting rod.

[0019] Step 2: After the outer shape is installed, install the protective plates. Control the four protective plates to be on the same horizontal plane by sliding the slider on the slide rail. The adapter is located inside the U-shaped seat and is connected to the U-shaped seat by inserting the pin. At the same time, the hinge shaft is inserted into the socket plate and the hinge seat to connect the socket plate and the hinge seat, so that the four protective plates are connected on the same horizontal plane to form a whole.

[0020] Step 3: After the protective plate is installed, take the buffer barrier plate and fit its guide tube onto the surface of the buffer rod. Control the buffer rod to compress the internal compression spring. Then, use screws to control the buffer barrier plate to be installed on the surface of the corresponding mounting connecting rod.

[0021] Step 4: After installation, the staff leaves the tunnel and remotely controls the blasting. After the blast, the debris inside the tunnel splashes out. When the debris splashes onto the surface of the protective plate, it exerts a pushing force on the protective plate, pushing it towards the guide tube. This causes the buffer rod to compress the spring, thereby offsetting the impact force of the debris under the buffer force. In addition to the debris splash, multiple protrusions arranged at different heights are also set on one side of the protective plate. When the debris hits the surface of the protective plate, they further offset the impact force of the debris and further improve the service life of the protective plate.

[0022] Step 5: Simultaneously, the impact pressure and dust gas generated inside the tunnel after the blasting enter the vertical ventilation holes as they pass through the protective plate. They then flow and move within the longitudinal and transverse ventilation holes to mitigate the impact of the airflow.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. This invention enables the device to be used multiple times by setting a portable installation and disassembly mechanism, which is convenient to install and disassemble and highly flexible. It also has a buffer protection mechanism to buffer, offset and block the flying debris generated after tunnel blasting, so as to avoid damage to equipment and personnel. Furthermore, it has an anti-collision mechanism and a ventilated guiding mechanism to reflect and guide the impact air pressure generated after tunnel blasting, thereby further preventing damage to equipment and personnel.

[0025] 2. By setting multiple protrusions of varying heights on the surface of the protective plate, the shock wave generated during tunnel blasting is reflected when it hits the surface of the protrusions and contacts the arc surface of the protrusions. As a result, the shock wave energy is rapidly attenuated, so that most of the shock wave is reflected and a small part escapes through the wave-blocking wall to the outside of the tunnel. The reflected part will be blocked multiple times in the tunnel and continuously attenuated into sound waves until it disappears. The escaped part has too little energy to cause damage to external equipment and personnel. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of a tunnel blasting flyrock protection device and its construction method.

[0027] Figure 2 A three-dimensional diagram of a portable installation and disassembly mechanism for a tunnel blasting flyrock protection device and construction method;

[0028] Figure 3 A three-dimensional diagram of the installation connecting rod structure of a tunnel blasting flyrock protection device and construction method;

[0029] Figure 4 A tunnel blasting flyrock protection device and construction method. Figure 3 Enlarged view of the structure at point A in the middle;

[0030] Figure 5 A tunnel blasting flyrock protection device and construction method. Figure 3 Enlarged view of the structure at point B in the middle;

[0031] Figure 6 A three-dimensional diagram of a limiting ring plate structure for a tunnel blasting flyrock protection device and construction method;

[0032] Figure 7 This is a three-dimensional diagram of a protrusion structure for a tunnel blasting flyrock protection device and construction method.

[0033] In the diagram: 1. Mounting connecting rod; 2. Expansion screw; 3. Portable installation and disassembly mechanism; 31. Slide rail; 32. Mounting groove; 33. Limiting ring plate; 34. Buffer barrier plate; 35. Slider; 36. Protective plate; 37. U-shaped seat; 38. Adapter seat; 39. Pin shaft; 310. Sleeve plate; 311. Hinge seat; 312. Hinge shaft; 4. Buffer protection mechanism; 41. Guide tube; 42. Compression spring; 43. Buffer rod; 5. Anti-collision mechanism; 51. Protrusion; 6. Ventilation guide mechanism; 61. Lateral vent; 62. Longitudinal vent; 63. Vertical vent. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] Example 1

[0036] Reference Figures 1-7 A tunnel blasting fly rock protection device includes mounting connecting rods 1. The first and last ends of multiple mounting connecting rods 1 are connected end to end to form a ring-shaped whole, and the outer surface of the ring-shaped whole is adapted to the inner wall of the tunnel. The multiple mounting connecting rods 1 are divided into two ring-shaped wholes and installed in a front-to-back manner. The outer surface of each ring-shaped whole is fixed to the inner wall of the tunnel by expansion screws 2. The interior of the two ring-shaped wholes are respectively provided with a portable installation and disassembly mechanism 3, a buffer protection mechanism 4, an anti-collision mechanism 5, and a ventilation and guiding mechanism 6.

[0037] In order to enable the buffer protection mechanism 4, the anti-collision mechanism 5 and the ventilation guide mechanism 6 to be installed, disassembled and carried easily; the portable installation and disassembly mechanism 3 includes a slide rail 31, and the inner walls of the two annular integrals formed by multiple mounting connecting rods 1 are provided with mounting grooves 32. The mounting grooves 32 on the surface of the two annular integrals correspond to each other, and the inner walls of each pair of corresponding mounting grooves 32 are respectively engaged with the two ends of the slide rail 31.

[0038] Specifically, this is achieved by using slide rail 31 to connect the surfaces of the two ring-shaped components. During disassembly, simply pull it out to separate the two ring-shaped components.

[0039] In order to limit the sides of the slide rail 31, multiple slide rails 31 are arranged in a curved pattern on the surface of the annular whole, and a limiting ring plate 33 is fixedly installed on one side surface of multiple mounting connecting rods 1 of one annular whole, and a buffer barrier plate 34 is connected to the other side surface of multiple mounting connecting rods 1 of another annular whole by screw threads.

[0040] Specifically, after the slide rail 31 is engaged, the limiting ring plates 33 and buffer plates 34 at both ends are installed to limit the slide rail 31 and prevent it from moving.

[0041] In order to install the buffer protection mechanism 4 inside the multiple slide rails 31, sliders 35 are slidably inserted into the surface of the slide rails 31. Protective plates 36 are fixedly installed on the surface of every two sliders 35. The four protective plates 36 are provided with left and right protection in adjacent vertical directions. U-shaped seats 37 are fixedly installed at one end of the two protective plates 36 of the left protection, and adapter seats 38 are fixedly installed at one end of the two protective plates 36 of the right protection. The adapter seats 38 are located inside the U-shape of the U-shaped seat 37 and are engaged with the U-shaped seat 37 and the adapter seats 38 by a pin 39 passing through the pin 39.

[0042] Specifically, the slider 35 is slidably inserted into the surface of the slide rail 31 to install four protective plates 36, so that the four protective plates 36 are installed on the same horizontal plane. During installation, the connection between the two protective plates 36 on the left and the two protective plates 36 on the right is controlled by the pin 39. Disassembly is also convenient when not in use.

[0043] Four protective plates 36 are provided with upper and lower protection in adjacent horizontal directions. The two upper protective plates 36 have a socket plate 310 fixedly installed on one side of the bottom end, and the two lower protective plates 36 have a hinge seat 311 fixedly installed on one side of the top end. The socket plate 310 is located on the top of the hinge seat 311 and is hinged through the socket plate 310 and the hinge seat 311 by the hinge shaft 312 passing through it.

[0044] Specifically, this is implemented by using the hinge shaft 312 to control the installation of the two top protective plates 36 and the two bottom protective plates 36, thereby connecting the four adjacent protective surfaces to form an overall tunnel protection.

[0045] In order to achieve the action of buffering and offsetting the impact of flying rocks on the anti-collision mechanism 5 after tunnel blasting; the buffer protection mechanism 4 includes guide tubes 41, and multiple guide tubes 41 are fixedly installed on the opposite surface of the buffer barrier plate 34. A compression spring 42 is fixedly installed on the inner wall of the guide tube 41. A buffer rod 43 is slidably inserted into one end of the guide tube 41. One end of the buffer rod 43 is in contact with one end of the compression spring 42. One end of the four buffer rods 43 is fixedly installed on the surface of the four protective plates 36 respectively.

[0046] Specifically, when the tunnel is blasted, flying rocks hit the surface of the protective plate 36, generating a thrust on the protective plate 36, which in turn compresses the compression spring. The reverse lateral force of the compression spring counteracts the thrust of the impact, thereby buffering and mitigating the impact force.

[0047] The anti-collision mechanism 5 realizes the action of preventing damage from flying rocks after tunnel blasting; the anti-collision mechanism 5 includes protrusions 51, one end of multiple protrusions 51 is hemispherical, multiple protrusions 51 are evenly distributed on the surface of four protective plates 36 in the vertical and horizontal directions, and multiple protrusions 51 are welded to the surface of the protective plates 36, and multiple protrusions 51 are arranged at high and low intervals in the length direction.

[0048] Specifically, this is achieved by setting multiple protrusions 51 arranged in sequence on the surface of the protective plate 36. During tunnel blasting, the shock wave energy impacts the surface of the protrusions 51 and bounces off their arc surfaces, causing the shock wave energy to attenuate rapidly. Most of the shock wave is reflected, while a small portion escapes through the wave-blocking wall to the outside of the tunnel. The reflected portion is repeatedly blocked inside the tunnel and attenuates into sound waves until it disappears. The escaped portion, due to its small energy, cannot cause harm to external equipment or personnel.

[0049] To achieve the action of guiding and diverting the internal impact pressure after tunnel blasting, the ventilation guiding mechanism 6 includes transverse ventilation holes 61, longitudinal ventilation holes 62, and vertical ventilation holes 63. The multiple transverse ventilation holes 61 are arranged perpendicularly to the multiple longitudinal ventilation holes 62, and the multiple vertical ventilation holes 63 are arranged perpendicularly to the multiple transverse ventilation holes 61 and the multiple longitudinal ventilation holes 62. The multiple vertical ventilation holes 63 are fixedly connected to the multiple transverse ventilation holes 61 and the multiple longitudinal ventilation holes 62, and the multiple transverse ventilation holes 61 and the multiple longitudinal ventilation holes 62 are all connected through each other.

[0050] Specifically, in this way, the shock wave generated during tunnel blasting first flows through the vertical vent 63 and then enters the transverse vent 61 and longitudinal vent 62 for diversion, thereby attenuating the shock wave energy, diverting and reflecting the shock wave, reducing the wave energy, and thus reducing the damage to external equipment and personnel.

[0051] Multiple transverse vents 61 and multiple longitudinal vents 62 are provided in the middle of the thickness of the protective plate 36, and multiple vertical vents 63 are provided on one side of the protective plate 36, with each vent located in the middle of the four adjacent protrusions 51.

[0052] Specifically, this is achieved by vertically intersecting the horizontal and vertical vents 61 and 62, and connecting the vertical vents 63 to form a three-dimensional interlaced flow space, which counteracts the shock wave effect.

[0053] This invention features a portable installation and disassembly mechanism that allows the device to be used multiple times, making installation and disassembly convenient and highly flexible. It also includes a buffer and protection mechanism that can buffer, offset, and block the flying debris generated after tunnel blasting, preventing damage to equipment and personnel. Furthermore, it incorporates an anti-impact mechanism and a ventilated guiding mechanism to reflect and guide the impact air pressure generated after tunnel blasting, further preventing damage to equipment and personnel.

[0054] Example 2

[0055] Reference Figures 1-7 A construction method for a tunnel blasting fly rock protection device, step one: before tunnel blasting, take out this device and install it inside the tunnel. Multiple installation connecting rods 1 are installed and fixed to the inner wall of the tunnel by expansion screws 2, so that they are connected end to end to form a ring. Control the two rings to be distributed in front and behind and correspond to each other. Then, make its slide rail 31 snap into the inner wall of the installation groove 32 of the installation connecting rod 1.

[0056] Step 2: After the outer shape is installed, install the protective plates 36. Control the four protective plates 36 to be on the same horizontal plane by sliding the slider 35 on the slide rail 31. The adapter 38 is located inside the U-shaped seat 37 and is connected to the U-shaped seat 37 by the pin 39. At the same time, the hinge shaft 312 is inserted into the socket plate 310 and the hinge seat 311 to connect the socket plate 310 and the hinge seat 311, so that the four protective plates 36 are connected on the same horizontal plane to form a whole.

[0057] Step 3: After the protective plate 36 is installed, take the buffer barrier plate 34 and fit its guide tube 41 onto the surface of the buffer rod 43. Control the buffer rod 43 to compress the internal compression spring. Then, control the buffer barrier plate 34 to be installed on the surface of the corresponding mounting connecting rod 1 by screws.

[0058] Step 4: After installation, the staff leaves the tunnel and remotely controls the blasting. After the blast, the debris inside the tunnel splashes. When the debris splashes onto the surface of the protective plate 36, it generates a pushing force on the protective plate 36, pushing the protective plate 36 towards the guide tube 41, causing the buffer rod 43 to compress the spring, thereby offsetting the impact force of the debris under the buffer force. In addition to the debris splash, multiple protrusions 51 arranged in order of height are also provided on one side of the protective plate 36. When the debris hits the surface of the protective plate 36, they further offset the impact force of the debris and further improve the service life of the protective plate 36.

[0059] Step 5: Simultaneously, the impact pressure and dust gas generated inside the tunnel after the blasting enter the vertical ventilation hole 63 after passing through the protective plate 36. They then flow and move within the longitudinal ventilation hole 62 and the transverse ventilation hole 61 to alleviate the impact force of the airflow.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for protecting against flying rocks in tunnel blasting, comprising a mounting connection rod (1), characterized in that: The first ends and the tail ends of the plurality of mounting connecting rods (1) are connected end to end to form a ring-shaped whole, and the outer surface of the ring-shaped whole is matched with the inner wall of the tunnel, the plurality of mounting connecting rods (1) are divided into two ring-shaped wholes, and are distributed and mounted in front and back, and the outer surface of each ring-shaped whole is fixedly mounted on the inner wall of the tunnel through expansion screws (2); The inner parts of the two ring-shaped wholes are respectively provided with portable mounting and dismounting mechanisms (3), buffer protection mechanisms (4), anti-collision mechanisms (5) and air-permeable guiding mechanisms (6); the portable mounting and dismounting mechanism (3) comprises slide rails (31), and the inner walls of the two ring-shaped wholes formed by the plurality of mounting connecting rods (1) are each provided with a mounting groove (32), the surface mounting grooves (32) of the two ring-shaped wholes correspond to each other in pairs, and the inner walls of every two corresponding mounting grooves (32) are respectively clamped with both ends of the slide rail (31); The plurality of slide rails (31) are arranged and distributed in a curve on the surface of the ring-shaped whole, and a plurality of limiting ring plates (33) are fixedly mounted on one side surface of the plurality of mounting connecting rods (1) of one ring-shaped whole, and buffer blocking plates (34) are threadedly connected to the other side surfaces of the plurality of mounting connecting rods (1) of the other ring-shaped whole; The surface of the slide rail (31) is slidably inserted with a sliding block (35), the surfaces of every two sliding blocks (35) are each fixedly provided with a protection plate (36), four protection plates (36) are provided with left protection and right protection in adjacent vertical directions, one end of the two protection plates (36) of the left protection is each fixedly provided with a U-shaped seat (37), one end of the two protection plates (36) of the right protection is each fixedly provided with an adapter seat (38), the adapter seat (38) is located in the U-shaped interior of the U-shaped seat (37), and is clamped through a pin shaft (39) penetrating the U-shaped seat (37) and the adapter seat (38); Four protection plates (36) are provided with upper protection and lower protection in adjacent horizontal directions, the bottom side surface of the two protection plates (36) of the upper protection is fixedly provided with a sleeve plate (310), the top side surface of the two protection plates (36) of the lower protection is fixedly provided with a hinged seat (311), the sleeve plate (310) is located on the top of the hinged seat (311), and is hinged through a hinge shaft (312) penetrating the sleeve plate (310) and the hinged seat (311); The anti-collision mechanism (5) realizes the action of preventing damage caused by flying stones after tunnel blasting; the anti-collision mechanism (5) comprises protrusions (51), one end of each of the plurality of protrusions (51) is in a hemispherical shape, the plurality of protrusions (51) are arranged and distributed in vertical and horizontal directions on the surfaces of the four protection plates (36) in equal parts, and the plurality of protrusions (51) are welded on the surfaces of the protection plates (36), and the plurality of protrusions (51) are arranged in high-low intervals in the length direction; The buffer protection mechanism (4) realizes the action of buffering and offsetting the impact of flying stones on the anti-collision mechanism (5) after tunnel blasting; The air permeable guide mechanism (6) realizes the action of air permeable guide and shunt after the internal impact pressure of tunnel blasting; the air permeable guide mechanism (6) comprises horizontal air permeable holes (61), longitudinal air permeable holes (62) and vertical air permeable holes (63), a plurality of the horizontal air permeable holes (61) are vertically and crossly arranged with a plurality of the longitudinal air permeable holes (62), a plurality of the vertical air permeable holes (63) are vertically and crossly arranged with a plurality of the horizontal air permeable holes (61) and a plurality of the longitudinal air permeable holes (62), a plurality of the vertical air permeable holes (63) are fixedly communicated with a plurality of the horizontal air permeable holes (61) and a plurality of the longitudinal air permeable holes (62), and a plurality of the horizontal air permeable holes (61) and a plurality of the longitudinal air permeable holes (62) are through-communicated; A plurality of the horizontal air permeable holes (61) and a plurality of the longitudinal air permeable holes (62) are arranged in the middle part of the thickness of the protection plate (36), a plurality of the vertical air permeable holes (63) are arranged on one side of the protection plate (36), and each air permeable hole is located in the middle part of the adjacent four protrusions (51); The portable mounting and dismounting mechanism (3) realizes the action that the buffer protection mechanism (4), the anti-collision mechanism (5) and the air permeable guide mechanism (6) can be mounted and dismounted and are convenient to carry.

2. A device for protecting against flyrock from a tunnel blast according to claim 1, characterized in that: The buffer protection mechanism (4) comprises guide pipes (41), a plurality of the guide pipes (41) are fixedly mounted on the opposite surfaces of the buffer barrier plate (34), the inner wall of the guide pipe (41) is fixedly mounted with a compression spring (42), one end of the guide pipe (41) is slidably inserted with a buffer rod (43), one end of the buffer rod (43) is in contact with one end of the compression spring (42), and one end of four buffer rods (43) is fixedly mounted on the surface of four protection plates (36).

3. The construction method of a tunnel blasting flyrock protection device according to claim 2, characterized in that: Step one, before tunnel blasting, the device is first taken and mounted in the inside of the tunnel, a plurality of mounting connecting rods (1) are mounted and fixed on the inner wall of the tunnel through expansion screws (2), and the first and last ends are connected to form a ring-shaped whole, the control two ring-shaped wholes are distributed in front and back corresponding relationship, and the sliding rail (31) is clamped in the inner wall of the mounting groove (32) of the mounting connecting rod (1); Step two, after the outer shape is mounted, the protection plate (36) is mounted, the four protection plates (36) are located on the same horizontal plane by sliding the sliding block (35) on the sliding rail (31), the adapter seat (38) is located in the inside of the U-shaped seat (37), the adapter seat (38) and the U-shaped seat (37) are connected by inserting the pin shaft (39), the sleeve plate (310) and the hinge seat (311) are connected by inserting the hinge shaft (312) in the inside of the sleeve plate (310) and the hinge seat (311), and then the four protection plates (36) are connected in a horizontal plane to form a whole. Step three, after the installation of the protection plate (36), take the buffer barrier plate (34) to make its surface guide pipe (41) sleeve joint in the surface of the buffer rod (43), control the buffer rod (43) extrusion inside the compression spring, through the screw control buffer barrier plate (34) installed in the surface of the corresponding installation connecting rod (1); Step four, after the installation, the staff leaves the tunnel, remote control blasting, after blasting, the tunnel inside the flying of the rubble, when the flying of the rubble to the surface of the protection plate (36) to the protection plate (36) to produce the thrust, push the protection plate (36) to the direction of the guide pipe (41) movement, make the buffer rod (43) extrusion compression spring, in turn under the buffer force to offset the impact force of the rubble, put the flying of the rubble and the side of the protection plate (36) is also provided with a plurality of convex block (51) arranged in high-low, when the impact of the rubble to the surface of the protection plate (36) to further offset the impact force of the rubble, and further improve the service life of the protection plate (36); Step five, at the same time, the impact pressure and dust gas generated inside the tunnel after blasting, through the protection plate (36) into the vertical air hole (63), in the longitudinal air hole (62) and the horizontal air hole (61) inside the flow movement, to relieve the impact force of the airflow.

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