A safety protection structure for tunnel blasting construction

Abstract

The present invention provides a tunnel blasting construction safety protection structure, which belongs to the field of tunnel construction, and includes a protection shell, a protection door is provided on one side of the protection shell, a top frame plate is slidably connected to the top of the side of the protection shell, a top plate is fixed to the top of the top frame plate, the top of the top plate is connected to the impact-resistant seat through a connecting mechanism, a plurality of damping springs are provided on the top of the protection shell, the top output end of the damping spring is connected to the bottom of the top plate, and a plurality of side surfaces of the protection shell are provided with movable grooves, and a movable plate is slidably connected inside the movable grooves. The present invention has the following beneficial effects: through the design of the connecting mechanism, the impact-resistant seat can be fixed to the top of the top plate, and when the impact-resistant seat is damaged, the damaged part can be replaced, thereby realizing the corresponding partial replacement, reducing the maintenance cost of the device, and extending the service life of the device.

Description

Technical Field

[0001] The invention relates to a tunnel blasting construction safety protection structure, belonging to the field of tunnel construction. Background Art

[0002] Tunnels are the focus and key projects of highway and railway construction. With the development of railway construction and the advancement of science and technology, tunnel excavation methods have developed rapidly. The more commonly used excavation methods are drilling and blasting, shield method and tunnel boring machine method. Due to the strong adaptability of drilling and blasting to geological conditions and low excavation cost, it is particularly suitable for the construction of hard rock tunnels, broken rock tunnels and a large number of short tunnels. Therefore, drilling and blasting is still a commonly used tunnel excavation method at home and abroad. However, in the process of blasting and excavation, it is inevitable to disturb the surrounding retained rock mass, so there will be falling rocks in the tunnel and cause harm to personnel and equipment, so it is necessary to provide a safety protection structure to protect personnel and equipment. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention aims to provide a tunnel blasting construction safety protection structure.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A tunnel blasting construction safety protection structure comprises a protection shell, a protection door is provided on one side of the protection shell, a top frame plate is slidably connected to the top of the side of the protection shell, a top plate is fixed to the top of the top frame plate, the top of the top plate is connected to an impact-resistant seat through a connecting mechanism, a plurality of damping springs 1 are provided on the top of the protection shell, the top output end of the damping spring 1 is connected to the bottom of the top plate, several side surfaces of the protection shell are provided with movable grooves, a movable plate is slidably connected inside the movable groove, a side frame plate is fixed to the side of the movable plate, the end of the side frame plate passes through the outside of the movable groove and is connected and fixed to the side protection plate, and a plurality of damping springs 2 are provided on the outer surface of the protection shell, and the end of the damping spring 2 is connected and fixed to the side protection plate.

[0006] Furthermore, the impact-resistant seat includes a triangular prism structure composed of a plurality of impact-resistant protective blocks, a bottom column is provided at the bottom center of the plurality of impact-resistant protective blocks, a plurality of docking blocks are evenly fixed at the bottom of the circumferential outer surface of the bottom column, a slope is provided on the side of the docking block, and the bottom column carries the docking block through the interior of the top plate and is connected and fixed to the connecting mechanism.

[0007] Furthermore, the connecting mechanism includes a snap-in assembly, a transmission assembly and a limit assembly, the snap-in assembly includes an inner cavity opened inside the top plate, the top of the inner cavity is provided with an inlet and outlet penetrating to the outer surface of the top of the top plate, and the sides of the inlet and outlet are provided with two groups of vertically distributed docking ports, and the docking ports are connected to the inner cavity.

[0008] Furthermore, the clamping assembly also includes a turbine rotatably connected to the bottom of the inner cavity, and a plurality of L-shaped clamping plates are evenly arranged on the circumferential sides of the top of the turbine. The bottom column carries the docking block through the inlet and outlet and the docking port into the interior of the inner cavity, and the L-shaped clamping plate clamps and fixes the docking block together.

[0009] Further, the transmission assembly includes several groups of connecting cavities opened in the inner wall of the top plate, the connecting cavities are connected to several inner cavities on the same side, and the several groups of connecting cavities are connected through a movable cavity. The movable cavity is provided with a movable opening that penetrates to the outer surface of the top plate on the side away from the connecting cavity. A worm is rotatably connected inside the connecting cavity, and the worm is meshed with several turbines on the same side. Several rotating shafts are rotatably connected inside the moving cavity, a long gear is fixed on the rotating shaft, and the end of the rotating shaft penetrates into the connecting cavity and is connected and fixed to the end of the worm.

[0010] Furthermore, the transmission assembly also includes several groups of rack plates that cooperate with the long gear, a sliding block is fixed to the bottom of the rack plate, a limiting slide groove that cooperates with the sliding block is opened on the inner bottom of the movable cavity, one side of the limiting slide groove is connected to an adjustment slide groove that cooperates with the sliding block, the side edge of the rack plate is connected to the grip plate through a connecting plate, the grip plate is accommodated in the movable opening, and several grip plates are connected end to end.

[0011] Furthermore, the limit assembly includes a plurality of guide slots opened on the side of the top plate, the guide slots are internally slidably connected with a limit block, the side of the limit block is squeezed together with the outer surface of the grip plate, and a through hole is opened in the middle of the limit block.

[0012] Furthermore, the limiting assembly also includes a receiving groove opened on the outer surface of the top plate, a horizontal plate matching the perforation is clamped inside the receiving groove, and a group of magnetic adsorption blocks are respectively provided on the upper and lower sides of the outer surface of the top plate, and the magnetic adsorption blocks are adsorbed together with the limiting blocks.

[0013] Furthermore, a slide groove 1 is provided on the top of the outer surface of the protective shell, and a slider 1 matching with the slide groove 1 is fixed on the inner wall of the top frame plate.

[0014] Furthermore, the bottom of the protective shell is anchored in the tunnel foundation by anchor rods.

[0015] Beneficial effects of the present invention:

[0016] The present invention can provide safety protection for personnel and equipment during tunnel construction, and the present invention also has the following advantages:

[0017] Through the design of the impact-resistant seat, a triangular prism structure is formed by splicing several impact-resistant protection blocks, thereby improving the impact resistance of the impact-resistant seat. At the same time, through the design of the splicing structure, it is convenient to replace the damaged local impact-resistant protection blocks, thereby reducing the maintenance cost of the impact-resistant seat and increasing the service life of the impact-resistant seat.

[0018] Through the design of the connecting mechanism, the impact-resistant seat can be fixed on the top of the top plate. At the same time, when the impact-resistant seat is damaged, the damaged part can be replaced to achieve corresponding local replacement, reduce the maintenance cost of the device, and extend the service life of the device.

[0019] Through the design of the card-connecting assembly, the transmission assembly can drive the turbine and the L-shaped card plate to rotate. The rotation of the L-shaped card plate will gradually separate from the docking block. At this time, the docking block is no longer limited by the L-shaped card plate. At this time, several impact-resistant protective blocks on this side can be limited by the card-connecting, and then the impact-resistant protective block that needs to be replaced can be removed and replaced with a new impact-resistant protective block.

[0020] Through the design of the transmission component, when the impact-resistant protection block needs to be replaced and maintained, the grip plate corresponding to the impact-resistant protection block is pulled out from the movable opening. During the pulling-out process, the grip plate drives the rack plate to move from the limiting slide groove to the adjusting slide groove through the connecting plate, and then the grip plate is pushed along the movable opening. The grip plate drives the rack plate to slide in the adjusting slide groove through the connecting plate. The rack plate drives the long gear to rotate. The rotation of the long gear drives the worm to rotate through the rotating shaft. The rotation of the worm drives the clamping assembly to rotate.

[0021] Through the design of the limit assembly, when the grip plate is stored in the movable opening, the limit block is squeezed together with the outer surface of the grip plate to limit the grip plate. After the grip plate is pulled out and moved, the limit block is squeezed together with the side of the grip plate to limit the stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 paying creative work.

[0023] Figure 1A schematic diagram of the three-dimensional structure of a tunnel blasting construction safety protection structure according to the present invention;

[0024] Figure 2 A schematic diagram of the protective shell structure of a tunnel blasting construction safety protection structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the top frame plate structure of a tunnel blasting construction safety protection structure of the present invention;

[0026] Figure 4 A schematic diagram of a roof structure of a tunnel blasting construction safety protection structure according to the present invention;

[0027] Figure 5 It is a partial structural schematic diagram of a connection mechanism of a tunnel blasting construction safety protection structure of the present invention;

[0028] Figure 6 A schematic diagram of the internal partial structure of a roof of a tunnel blasting construction safety protection structure according to the present invention;

[0029] Figure 7 A schematic diagram of the connection structure of a rack plate, a connecting plate and a grip plate of a tunnel blasting construction safety protection structure of the present invention;

[0030] Figure 8 A schematic diagram of the connection structure of a rack plate, a sliding block, a connecting plate and a gripping plate of a tunnel blasting construction safety protection structure of the present invention;

[0031] Fig. 9 A schematic diagram of an impact-resistant protective block, a bottom column, a docking block, and an inclined connection structure of a tunnel blasting construction safety protection structure of the present invention;

[0032] Fig.10 This is a schematic diagram of a bottom column, a docking block, and a slope connection structure of a tunnel blasting construction safety protection structure of the present invention;

[0033] Fig.11 This is a schematic diagram of the internal structure of a tunnel blasting construction safety protection structure of the present invention;

[0034] Fig.12 The present invention is a schematic diagram of the connection structure of a movable plate, a side frame plate and a side protection plate of a tunnel blasting construction safety protection structure.

[0035] In the figure, 1, protective shell; 2, protective door; 3, top frame plate; 4, slider 1; 5, slide groove 1; 6, top plate; 7, impact-resistant protective block; 8, damping spring 1; 9, inlet and outlet; 10, docking port; 11, inner cavity; 12, connecting cavity; 13, moving cavity; 14, turbine; 15, L-shaped card plate; 16, bottom column; 17, docking block; 18, inclined surface; 19, worm; 20, rotating shaft; 21 , long gear; 22, rack plate; 23, sliding block; 24, connecting plate; 25, grip plate; 26, movable opening; 27, limit slide; 28, adjustment slide; 29, guide slide; 30, limit block; 31, receiving groove; 32, cross plate; 33, magnetic adsorption block; 34, movable groove; 35, movable plate; 36, side frame plate; 37, side protection plate; 38, damping spring two; 39, perforation. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figure 1-Figure 12 The present invention provides a technical solution for a safety protection structure for tunnel blasting construction, comprising a protection shell 1, the bottom of the protection shell 1 is anchored in the tunnel foundation by an anchor rod, a protection door 2 is provided on one side of the protection shell 1, a top frame plate 3 is slidably connected to the top of the side edge of the protection shell 1, a slide groove 5 is provided on the top of the outer surface of the protection shell 1, a slider 4 matching the slide groove 5 is fixed on the inner wall of the top frame plate 3, a top plate 6 is fixed on the top of the top frame plate 3, and the top of the top plate 6 is connected to the impact-resistant seat through a connecting mechanism, and the protection shell 1 is provided with a plurality of damping springs 8 at the top, and the top output end of the damping spring 8 is connected to the bottom of the top plate 6, and a plurality of side surfaces of the protective shell 1 are provided with movable grooves 34, and a movable plate 35 is slidably connected inside the movable groove 34, and a side frame plate 36 is fixed to the side of the movable plate 35, and the end of the side frame plate 36 passes through the outside of the movable groove 34 and is connected and fixed to the side protective plate 37, and a plurality of damping springs 38 are provided on the outer surface of the protective shell 1, and the end of the damping spring 38 is connected and fixed to the side protective plate 37.

[0038] See also Figure 1The impact-resistant seat includes a triangular prism structure composed of a plurality of impact-resistant protective blocks 7, a bottom column 16 is provided at the bottom center of the plurality of impact-resistant protective blocks 7, a plurality of docking blocks 17 are evenly fixed on the bottom of the circumferential outer surface of the bottom column 16, a slope 18 is provided on the side of the docking block 17, and the bottom column 16 carries the docking block 17 through the inside of the top plate 6 and is connected and fixed to the connecting mechanism; through the design of the impact-resistant seat, a triangular prism structure is formed by splicing a plurality of impact-resistant protective blocks 7, thereby improving the impact resistance of the impact-resistant seat, and at the same time, through the design of the splicing structure, it is convenient to replace the damaged local impact-resistant protective block 7, thereby reducing the maintenance cost of the impact-resistant seat and increasing the service life of the impact-resistant seat.

[0039] See also Figure 4-Figure 6 The connecting mechanism includes a clamping assembly, a transmission assembly and a limit assembly. The clamping assembly includes an inner cavity 11 opened inside the top plate 6. The top of the inner cavity 11 is provided with an inlet and outlet 9 penetrating to the outer surface of the top of the top plate 6. The sides of the inlet and outlet 9 are provided with two groups of vertically distributed docking ports 10, and the docking ports 10 are connected to the inner cavity 11. Through the design of the connecting mechanism, the impact-resistant seat can be fixed on the top of the top plate 6. At the same time, when the impact-resistant seat is damaged, the damaged part can be replaced to achieve corresponding local replacement, reduce the maintenance cost of the device, and extend the service life of the device. The clamping assembly also includes a rotatable connection to the bottom of the inner cavity 11. The turbine 14 at the top is provided with a plurality of L-shaped card plates 15 evenly on the circumferential side edges of the top of the turbine 14. The bottom column 16 carries the docking block 17 through the inlet and outlet 9 and the docking port 10 to penetrate into the inner cavity 11. The L-shaped card plate 15 clamps and fixes the docking block 17 together. Through the design of the clamping assembly, the transmission assembly can drive the turbine 14 and the L-shaped card plate 15 to rotate. The L-shaped card plate 15 will gradually separate from the docking block 17 when it rotates. At this time, the docking block 17 is no longer limited by the L-shaped card plate 15. At this time, the plurality of impact-resistant protective blocks 7 on this side can be clamped and limited. That is, the impact-resistant protective block 7 that needs to be replaced can be removed and replaced with a new impact-resistant protective block 7.

[0040] See also Figure 5-Figure 10The transmission assembly includes several groups of connecting cavities 12 opened in the inner wall of the top plate 6, the connecting cavities 12 are connected to several inner cavities 11 on the same side, and several groups of connecting cavities 12 are connected through a moving cavity 13, and a movable opening 26 that penetrates to the outer surface of the top plate 6 is opened on the side of the moving cavity 13 away from the connecting cavity 12. A worm 19 is rotatably connected inside the connecting cavity 12, and the worm 19 is meshed with several turbines 14 on the same side. Several rotating shafts 20 are rotatably connected inside the moving cavity 13, and a long gear 21 is fixed on the rotating shaft 20. The end of the rotating shaft 20 penetrates into the connecting cavity 12 and is connected and fixed to the end of the worm 19. The transmission assembly also includes several groups of rack plates 22 that match the long gear 21, and a sliding block 23 is fixed to the bottom of the rack plate 22. The inner bottom of the moving cavity 13 is provided with a gear that matches the sliding block 23 The limiting slide groove 27 is connected to the adjusting slide groove 28 which cooperates with the sliding block 23 on one side. The side of the rack plate 22 is connected to the grip plate 25 through the connecting plate 24. The grip plate 25 is accommodated in the movable opening 26, and several grip plates 25 are connected end to end. Through the design of the transmission component, when the impact-resistant protective block 7 needs to be replaced and maintained, the grip plate 25 corresponding to the impact-resistant protective block 7 is pulled out from the movable opening 26. During the pulling-out process, the grip plate 25 drives the rack plate 22 to move from the limiting slide groove 27 to the adjusting slide groove 28 through the connecting plate 24, and then pushes the grip plate 25 along the movable opening 26. The grip plate 25 drives the rack plate 22 to slide in the adjusting slide groove 28 through the connecting plate 24. The rack plate 22 drives the long gear 21 to rotate. The rotation of the long gear 21 drives the worm 19 to rotate through the rotating shaft 20. The rotation of the worm 19 drives the clamping assembly to rotate.

[0041] See also Figure 1 and Figure 4-Figure 6 The limit assembly includes a plurality of guide slots 29 provided on the side of the top plate 6, the guide slots 29 are internally slidably connected with a limit block 30, the side of the limit block 30 is squeezed together with the outer surface of the grip plate 25, a through hole 39 is provided in the middle of the limit block 30, the limit assembly also includes a receiving slot 31 provided on the outer surface of the top plate 6, a cross plate 32 matching the through hole 39 is clamped inside the receiving slot 31, and a group of magnetic adsorption blocks 33 are respectively provided on the upper and lower sides of the outer surface of the top plate 6, and the magnetic adsorption blocks 33 are adsorbed together with the limit block 30; through the design of the limit assembly, when the grip plate 25 is received in the movable opening 26, the limit block 30 is squeezed together with the outer surface of the grip plate 25, which plays a role in limiting the grip plate 25, and after the grip plate 25 is pulled out and moved, the limit block 30 is squeezed together with the side of the grip plate 25, which plays a role in limiting the stroke.

[0042] During the tunnel blasting construction process, there will be falling rocks falling and splashing in the tunnel. At this time, the rocks falling in the tunnel will hit the impact-resistant seat. When the pressure is too large, the impact-resistant seat will drive the top plate 6 and the top frame plate 3 to drop, and the top plate 6 will squeeze a number of damping springs 1 8. The damping springs 1 8 will buffer the impact force on the top plate 6, thereby helping the impact-resistant seat to buffer the pressure. The rocks rolling in the tunnel will hit the side protection plate 37 on the side of the protective shell 1. The side protection plate 37 will squeeze the damping spring 2 38 when it is hit, and the side protection plate 37 will absorb the impact force through a number of damping springs 2 38.

[0043] After the impact-resistant seat is used for a long time, the several impact-resistant protective blocks 7 that make up the impact-resistant seat will be damaged to varying degrees. The impact-resistant protective blocks 7 that are severely damaged need to be replaced and maintained to meet the use of the impact-resistant seat. When a single impact-resistant protective block 7 needs to be replaced, at this time, the grip plate 25 corresponding to the impact-resistant protective block 7 is pulled out from the movable opening 26. During the pulling-out process, the grip plate 25 drives the rack plate 22 to move from the limiting slide groove 27 to the adjusting slide groove 28 through the connecting plate 24. The rack plate 22 moves from one side of the long gear 21 to the other side and is still in a meshing state, and the corresponding limiting block 25 is pulled out before being pulled out. The grip plate 25 is lifted up to prevent the limit block 30 from affecting the movement of the pull-out grip plate 25. After the grip plate 25 is pulled out, the sliding block 23 at the bottom of the rack plate 22 slides in the adjustment slot 28, and then pushes the grip plate 25 along the movable opening 26. The grip plate 25 drives the rack plate 22 to slide in the adjustment slot 28 through the connecting plate 24. Then, the limit block 30 is released, and the limit block 30 descends. The limit block 30 will be squeezed on the side of the grip plate 25, thereby playing a limiting role to prevent the grip plate 25 from moving back. In the process of the grip plate 25 sliding, the rack plate 22 will drive the long gear 21 to rotate, and the rotation of the long gear 21 will drive the worm 19 through the rotating shaft 20. Rotate, the rotation of the worm 19 will drive the turbine 14 and the L-shaped card plate 15 to rotate, and the L-shaped card plate 15 will gradually separate from the docking block 17 when it rotates. At this time, the docking block 17 is no longer limited by the L-shaped card plate 15. At this time, the several impact-resistant protection blocks 7 on this side can be limited by the card connection, and the impact-resistant protection block 7 that needs to be replaced can be removed and replaced with a new impact-resistant protection block 7. After the replacement is completed, the above operation can be repeated in reverse to limit the several impact-resistant protection blocks 7 on this side again. When it is necessary to replace several impact-resistant protection blocks 7, at this time, take out the cross plate 32 from the accommodating groove 31, and then insert the cross plate 32 into the same The plurality of limit blocks 30 are inserted into the through holes 39 on the plurality of limit blocks 30 on the side, and then the horizontal plate 32 is pulled up to drive the plurality of limit blocks 30 to rise synchronously. Then, the plurality of grip plates 25 are pulled out one by one, and then the grip plates 25 at the end are pushed. The plurality of grip plates 25 are squeezed together to achieve synchronous movement. During the movement of the grip plates 25, the worm 19 is driven to rotate synchronously to achieve the rotational drive of the turbine 14. After the grip plates 25 are moved, the limit blocks 30 are taken out, and the limit blocks 30 limit the grip plates 25. Then the impact-resistant protective block 7 is replaced. After the replacement is completed, the above operation is repeated in reverse to achieve the limit clamping of the impact-resistant protective block 7.

[0044] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A tunnel blasting construction safety protection structure, characterized in that: The invention comprises a protective shell (1), wherein a protective door (2) is provided on one side of the protective shell (1), a top frame plate (3) is slidably connected to the top of the side edge of the protective shell (1), a top plate (6) is fixed to the top of the top frame plate (3), the top of the top plate (6) is connected to the impact-resistant seat through a connecting mechanism, a plurality of damping springs (8) are provided on the top of the protective shell (1), the top output end of the damping spring (8) is connected to the bottom of the top plate (6), a plurality of side surfaces of the protective shell (1) are provided with movable grooves (34), a movable plate (35) is slidably connected inside the movable groove (34), a side frame plate (36) is fixed to the side of the movable plate (35), and the side frame plate (36) is ) is passed through the outer side of the movable groove (34) and is connected and fixed to the side protection plate (37); the outer surface of the protection shell (1) is provided with a plurality of damping springs (38); the ends of the damping springs (38) are connected and fixed to the side protection plate (37); the impact-resistant seat comprises a triangular prism structure composed of a plurality of impact-resistant protection blocks (7); a bottom column (16) is provided at the bottom center of the bottom of the plurality of impact-resistant protection blocks (7); a plurality of docking blocks (17) are evenly fixed at the bottom of the circumferential outer surface of the bottom column (16); a slope (18) is provided on the side of the docking block (17); the bottom column (16) carries the docking block (17) and passes through the inside of the top plate (6) and is connected and fixed to the connecting mechanism. The connection mechanism comprises a clamping assembly, a transmission assembly and a limit assembly, the clamping assembly comprises an inner cavity (11) opened inside the top plate (6), the top of the inner cavity (11) is provided with an inlet and outlet (9) penetrating to the outer surface of the top of the top plate (6), the side of the inlet and outlet (9) is provided with two groups of vertically distributed docking ports (10), the docking ports (10) are communicated with the inner cavity (11), the clamping assembly also comprises a worm gear (14) rotatably connected to the bottom of the inner cavity (11), the circumferential side of the top of the worm gear (14) is evenly provided with a plurality of L-shaped clamping plates (15), the bottom column (16) carries the docking block (17) through the inlet and outlet (9) and the docking port (10) to penetrate to the inner cavity (11). Inside the inner cavity (11), the L-shaped clamping plate (15) clamps and fixes the docking block (17) together, the transmission assembly comprises a plurality of groups of connecting cavities (12) opened in the inner wall of the top plate (6), the connecting cavities (12) are connected to a plurality of the inner cavities (11) on the same side, the plurality of groups of connecting cavities (12) are connected via a movable cavity (13), a movable opening (26) penetrating to the outer surface of the top plate (6) is opened on a side of the movable cavity (13) away from the connecting cavity (12), a worm (19) is rotatably connected inside the connecting cavity (12), the worm (19) is meshed with a plurality of worm wheels (14) on the same side, and a plurality of rotating shafts (20) are rotatably connected inside the movable cavity (13).A long gear (21) is fixed on the rotating shaft (20), and an end of the rotating shaft (20) passes through the connecting cavity (12) and is connected and fixed to the end of the worm (19). The transmission assembly also includes a plurality of rack plates (22) matched with the long gear (21), a sliding block (23) is fixed to the bottom of the rack plate (22), and a limiting slide groove (27) matched with the sliding block (23) is formed at the inner bottom of the movable cavity (13), and one side of the limiting slide groove (27) is connected to an adjusting slide groove (28) matched with the sliding block (23). The side of the rack plate (22) is connected to a grip plate (25) through a connecting plate (24), and the grip plate (25) is accommodated in the movable opening (26). A plurality of the gripping plates (25) are connected end to end, the limiting assembly comprises a plurality of guide slots (29) provided on the side of the top plate (6), the guide slots (29) are slidably connected to the limiting blocks (30), the side of the limiting blocks (30) are pressed together with the outer surface of the gripping plates (25), a through hole (39) is provided in the middle of the limiting blocks (30), the limiting assembly further comprises a receiving slot (31) provided on the outer surface of the top plate (6), a horizontal plate (32) matching with the through hole (39) is clamped in the receiving slot (31), a group of magnetic adsorption blocks (33) are respectively provided on the upper and lower sides of the outer surface of the top plate (6), and the magnetic adsorption blocks (33) are adsorbed together with the limiting blocks (30).

2. A tunnel blasting construction safety protection structure according to claim 1, characterized in that: The top of the outer surface of the protective shell (1) is provided with a slide groove (5), and the inner wall of the top frame plate (3) is fixed with a sliding block (4) that matches the slide groove (5).

3. A tunnel blasting construction safety protection structure according to claim 1, characterized in that: The bottom of the protective shell (1) is anchored in the tunnel foundation by anchor rods.

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