Protective shed for tunnel blasting construction

Abstract

The invention relates to the technical field of blasting protection equipment, and particularly discloses a tunnel blasting construction protection shed. The tunnel protection device comprises a shell, a protection mechanism is arranged in the shell, the protection mechanism comprises a protection plate assembly used for blocking a tunnel portal, the protection plate assembly comprises a protection plate, and a first extension plate and a second extension plate are arranged on the two sides of the protection plate correspondingly; an extension mechanism is arranged at the protection plate and is used for pushing the extension plate I and the extension plate II to extend towards the two sides in the length direction of the protection plate; a lifting mechanism is further arranged in the shell and used for pushing the protection plate to move in the height direction of the tunnel portal. According to the protective shed, constructors can conveniently adjust the position of the protective plate, and the protective plate can better block a tunnel portal.

Description

Technical Field

[0001] The invention relates to the technical field of blasting protection equipment, in particular to a tunnel blasting construction protection shed. Background Art

[0002] At present, in the construction of mountain tunnels for railways, highways and other projects, drilling and blasting methods are mostly used. During blasting construction, flying rocks and shock waves are often generated. Among them, the flight path of flying rocks is difficult to control. Houses, buildings, poles and wires near the tunnel entrance that are affected by tunnel excavation blasting are easily damaged by flying rocks. In addition, people and livestock near the tunnel entrance are also at risk of being injured by flying rocks. Therefore, a protective device is needed during tunnel blasting construction to prevent flying rocks from flying out of the tunnel and destroying buildings and injuring people.

[0003] The commonly used tunnel blasting protection device currently comprises a first mounting rod, a second mounting rod, a rotating shaft and a driving assembly for driving the rotating shaft to rotate, wherein the two ends of the rotating shaft are respectively rotatably connected to the top ends of the first mounting rod and the second mounting rod, and a flexible rubber net is wound on the rotating shaft; a lifting driving member is provided below the first mounting rod and the second mounting rod, and the lifting driving member is used to drive the first mounting rod and the second mounting rod to lift and lower; the driving assembly is used to realize the release and reeling of the flexible rubber net, thereby shielding or exposing the tunnel opening, so as to prevent flying rocks from flying out during blasting, and facilitate slag removal after blasting, and the lifting driving member is used to realize the height adjustment of the rotating shaft, so that the device can be suitable for tunnel opening protection work at different heights.

[0004] However, the above device has the following disadvantages: The above device releases the flexible rubber net by driving the assembly, thereby preventing flying rocks from flying out and damaging buildings outside the tunnel or injuring people outside the tunnel. This protection method often causes the flexible rubber net to flutter at the tunnel entrance due to wind because the end of the flexible rubber net away from the rotating shaft cannot be fixed, thereby causing the buildings outside the tunnel or people outside the tunnel to still be at risk of being injured.

[0005] Although the above device can protect the tunnel entrance, it cannot adapt to tunnel entrances of different widths. If the width of the tunnel entrance needs to be expanded due to terrain or other reasons during on-site construction, the length of the pre-customized flexible rubber net will be smaller than the width of the tunnel entrance, causing flying rocks in the tunnel to fly out through the left and right spacing between the flexible rubber net and the tunnel entrance. Summary of the invention

[0006] The invention provides a tunnel blasting construction protection shed, which can overcome certain defects of the prior art.

[0007] A tunnel blasting construction protection shed according to the present invention comprises: an outer shell, a protection mechanism is arranged inside the outer shell, the protection mechanism comprises a protection plate assembly for blocking a tunnel opening, the protection plate assembly comprises a protection plate, and an extension plate 1 and an extension plate 2 are respectively arranged on both sides of the protection plate; an extension mechanism is arranged at the protection plate, and the extension mechanism is used to push the extension plate 1 and the extension plate 2 to extend to both sides along the length direction of the protection plate; a lifting mechanism is also arranged inside the outer shell, and the lifting mechanism is used to push the protection plate to move along the height direction of the tunnel opening.

[0008] Through the present invention, a shell is provided, and when the device is installed, the shell can be pre-buried in the land at the tunnel entrance. This installation method can avoid affecting the protection of the tunnel entrance due to the height of the shell. Hanging ears can be installed on the side walls on both sides of the shell. When the land at the tunnel entrance is dug deeper, the staff can connect the hook on the crane with the hanging ears, and then move the device to the digging depth of the land by the crane, and finally fill the surroundings of the shell to complete the installation of the device. A buffer layer can be provided on the rear side wall of the protective plate, and the buffer layer can be detachably connected to the protective plate. The buffer layer can prevent flying stones from directly contacting the protective plate, thereby extending the service life of the protective plate. The buffer layer is detachably connected to the protective plate, which is convenient for the staff to replace the buffer layer; The construction workers drive the threaded column in the first guide column to rotate through motor 1, and then drive the threaded column in the second guide column to rotate through the linkage mechanism; when the threaded column in the first guide column rotates, the threaded column will drive the transmission shaft 1 to rotate, and the rotation of the transmission shaft 1 will drive the driving wheel to rotate, and then drive the driven wheel to rotate through the transmission belt, and the rotation of the driven wheel will drive the transmission shaft 2 and the threaded column in the second guide column to rotate. At this time, the rotation of the threaded column will cause the nut to move along the threaded column, so that the nut brings the guide plate up or down along the guide groove. When the guide plate rises or falls, it will bring the mounting block and the support rod up or down, so that the protective plate rises or falls, which makes it convenient for the construction workers to adjust the position of the protective plate so that the protective plate can better block the tunnel entrance.

[0009] After the construction personnel have adjusted the upper and lower positions of the protective plate, they start the second motor, which drives the bidirectional screw to rotate. The rotation of the bidirectional screw pushes the first and second screw nuts to move toward or away from each other. At this time, the first and second screw nuts push the connecting column and the first and second extension plates to separate toward the two ends of the protective plate, thereby expanding the shielding area of ​​the protective plate; or shrinking it inward to adapt to a smaller opening; By setting a lifting mechanism, the lifting mechanism lifts the protective plate until the height of the protective plate corresponds to the height of the tunnel entrance. Compared with using a flexible rubber net to protect the tunnel entrance, the device will not cause the protective plate to deviate due to external force, thus avoiding the problem of buildings outside the tunnel or people outside the tunnel being injured by being hit; By setting up a protective mechanism, when the rising protective plate covers the tunnel entrance and there is a left and right spacing between the protective plate and the tunnel entrance, the bidirectional screw rod can be driven by motor 2 to rotate, and the rotating bidirectional screw rod moves away from each other through nut 1 and nut 2. At this time, extension plate 1 and extension plate 2 are respectively located on both sides of the protective plate, thereby expanding the protective position of the protective plate to adapt to the expanded tunnel entrance. This device can further avoid the problem of buildings outside the tunnel or personnel outside the tunnel being injured by being hit.

[0010] Preferably, the lifting mechanism includes a first guide column and a second guide column arranged on both sides of the protective plate, and the first guide column and the second guide column are both provided with a guide groove arranged along the length direction thereof; a threaded column arranged along the length direction of the guide groove is provided in the guide groove, and a guide plate that can slide along the guide groove is provided in the guide groove, and a nut matching the threaded column is provided on the guide plate; a mounting block is provided at the end of the guide plate away from the nut; a support plate for supporting the protective plate is provided under the protective plate; a connecting support rod for the support plate and the mounting block is provided between the support plate and the mounting block; a motor for driving the threaded column to rotate is provided at the upper end of the first guide column; an installation box is provided at the lower end of the first guide column, and a linkage mechanism for linking the rotation of the threaded column in the first guide column and the second guide column is provided in the installation box.

[0011] Through the present invention, workers drive the threaded column in the first guide column to rotate through motor 1, and then drive the threaded column in the second guide column to rotate through the linkage mechanism; when the threaded column in the first guide column rotates, the threaded column will drive the transmission shaft 1 to rotate, and the rotation of the transmission shaft 1 drives the driving wheel to rotate, and then drives the driven wheel to rotate through the transmission belt, and the rotation of the driven wheel drives the transmission shaft 2 and the threaded column in the second guide column to rotate, at this time, the rotation of the threaded column will cause the nut to move along the threaded column, so that the nut brings the guide plate up or down along the guide groove, and when the guide plate rises or falls, it will bring the mounting block and the support rod up or down, so that the protective plate rises or falls, which makes it convenient for construction workers to adjust the position of the protective plate, so that the protective plate can better block the tunnel entrance.

[0012] Preferably, the linkage mechanism includes a transmission shaft 1 and a transmission shaft 2 vertically arranged inside the installation box, the transmission shaft 1 and the transmission shaft 2 are both rotatably connected to the installation box, the transmission shaft 1 is fixedly connected to the threaded column in the first guide column, and the transmission shaft 2 is fixedly connected to the threaded column in the second guide column; a driving wheel is sleeved on the side wall of the transmission shaft 1, and a driven wheel is sleeved on the side wall of the transmission shaft 2, a transmission belt is arranged between the driving wheel and the driven wheel, and the driving wheel and the driven wheel are connected by the transmission belt.

[0013] According to the present invention, through the linkage mechanism, one motor can drive two threaded columns to rotate at the same time, thereby reducing the number of motors, thereby simplifying the structure of the entire system, making the equipment more compact, and easy to install and maintain. Preferably, the extension mechanism comprises an extension shell arranged along the length direction of the protective plate, wherein a mounting cavity is arranged in the extension shell; a through hole is arranged along the length direction of the extension shell and communicated with the mounting cavity; a partition block is arranged in the mounting cavity, and the partition block divides the mounting cavity into two sub-mounting cavities; a bidirectional screw rod is arranged in the mounting cavity along the length direction of the mounting cavity and passes through the partition block; a nut 1 and a nut 2 are arranged in the two sub-mounting cavities respectively on the bidirectional screw rod; Nut 1 and nut 2 are respectively provided with fixing plate 1 and fixing plate 2; fixing plate 1 and fixing plate 2 are respectively provided with support column 1 and support column 2 extending out of the through hole; extension plate 1 and extension plate 2 are provided with connecting columns for connecting extension plate 1 with support column 1, and extension plate 2 with support column 2; and motor 2 for driving the bidirectional screw to rotate is provided in the installation cavity.

[0014] According to the present invention, after the construction personnel have adjusted the upper and lower positions of the protective plate, the second motor is started, and the second motor drives the bidirectional screw to rotate. The bidirectional screw rotates to push the first and second screw nuts to move toward or away from each other. At this time, the first and second screw nuts push the connecting column and the first and second extension plates to separate toward the two ends of the protective plate, thereby expanding the shielding area of ​​the protective plate; or shrinking inward to adapt to a smaller hole; When the nut 1 and the nut 2 move toward each other, they will eventually be blocked by the partition block, thereby preventing the nut 1 and the nut 2 from interfering with each other when they move toward each other and affecting the movement of the nut 1 and the nut 2.

[0015] Preferably, a slide rail is provided in the installation cavity along the length direction of the installation cavity and passes through the partition block, and sliders are provided at both the first fixing plate and the second fixing plate; the slide rail passes through the slider.

[0016] Through the present invention, during the movement of nut one and nut two, nut one and nut two drive fixed plate one and fixed plate two and the slider to move along the slide rail, and the slide rail makes the movement of nut one and nut two more stable, thereby preferably improving the stability of nut one and nut two during movement.

[0017] Preferably, one end of the support rod is fixedly connected to the mounting block, and the other end is detachably connected to the support plate.

[0018] Through the present invention, a buckle is provided at one end of the support rod, and a slot matching the buckle is provided at the lower end of the support plate, so that the support rod connects the support plate to the support rod through the buckle and the slot, and it is also convenient for construction workers to disassemble and install the support plate.

[0019] Preferably, the fixing plate 1 and the fixing plate 2 are connected to the supporting column 1 and the supporting column 2 by bolts.

[0020] The present invention makes it convenient for installers to connect and disassemble the fixing plate 1 and the fixing plate 2 with the supporting column 1 and the supporting column 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the housing in Example 1.

[0022] Figure 2 This is a schematic diagram of the installation block in Example 1.

[0023] Figure 3 Schematic diagram of the lifting mechanism in Example 1.

[0024] Figure 4 Schematic diagram of the linkage mechanism in Example 1.

[0025] Figure 5 This is a schematic diagram of the extension mechanism in Example 1.

[0026] Figure 6 This is a schematic diagram of fixed plate 1 in Example 1. DETAILED DESCRIPTION

[0027] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0028] Example 1 like Figure 1-6 As shown, in this embodiment, a tunnel blasting construction protection shed is provided, including an outer shell 1, a protection mechanism 3 is arranged inside the outer shell 1, the protection mechanism 3 includes a protection plate assembly for blocking the tunnel opening, the protection plate assembly includes a protection plate 31, and an extension plate 1 326 and an extension plate 2 327 are respectively arranged on both sides of the protection plate 31; an extension mechanism 32 is provided at the protection plate 31, and the extension mechanism 32 is used to push the extension plate 1 326 and the extension plate 2 327 to extend to both sides along the length direction of the protection plate 31; a lifting mechanism 2 is also provided inside the outer shell 1, and the lifting mechanism 2 is used to push the protection plate 31 to move along the height direction of the tunnel opening.

[0029] Through this embodiment, a shell 1 is provided. When the device is installed, the shell 1 can be pre-buried in the land at the tunnel entrance. This installation method can avoid affecting the protection of the tunnel entrance due to the height of the shell 1. Hanging ears can be installed on the side walls on both sides of the shell 1. When the land at the tunnel entrance is dug deeper, the staff can connect the hook on the crane with the hanging ears, and then move the device to the depth of the land by the crane. Finally, fill the surrounding area of ​​the shell 1 to complete the installation of the device. The rear side wall of the protective plate 31 can be provided with a buffer layer, and the buffer layer can be detachably connected to the protective plate 31. The buffer layer can prevent flying stones from directly contacting the protective plate 31, thereby extending the service life of the protective plate 31. The buffer layer is detachably connected to the protective plate 31, which can facilitate the staff to replace the buffer layer; The construction personnel drive the threaded column 223 in the first guide column 22 to rotate through the motor 1 241, and then drive the threaded column 223 in the second guide column 23 to rotate through the linkage mechanism; when the threaded column 223 in the first guide column 22 rotates, the threaded column 223 will drive the transmission shaft 1 243 to rotate, and the rotation of the transmission shaft 1 243 drives the driving wheel 245 to rotate, and then drives the driven wheel 246 to rotate through the transmission belt 247, and the rotation of the driven wheel 246 drives the transmission shaft 244 and the threaded column 223 located in the second guide column 23 to rotate. At this time, the rotation of the threaded column 223 will cause the nut 225 to move along the threaded column 223, so that the nut 225 and the guide plate 228 rise or fall along the guide groove 229. When the guide plate 228 rises or falls, it will rise or fall with the mounting block 211 and the support rod 213, so that the protective plate 31 rises or falls, which makes it convenient for the construction personnel to adjust the position of the protective plate 31 so that the protective plate 31 can better block the tunnel entrance.

[0030] After the construction personnel have adjusted the upper and lower positions of the protection plate 31, the motor 2 3291 is started, and the motor 2 3291 drives the bidirectional screw 329 to rotate, and the bidirectional screw 329 rotates to push the nut 1 3292 and the nut 2 3293 to move toward or away from each other. At this time, the nut 1 3292 and the nut 2 3293 push the connecting column 325 and the extension plate 1 326 and the extension plate 2 327 to separate toward the two ends of the protection plate 31, thereby expanding the shielding area of ​​the protection plate 31; or shrinking it inward to adapt to a smaller hole; By setting the lifting mechanism 2, the lifting mechanism 2 lifts the protective plate 31 until the height of the protective plate 31 corresponds to the height of the tunnel entrance. Compared with using a flexible rubber net to protect the tunnel entrance, the device will not cause the protective plate to deviate due to external force, thereby avoiding the problem of buildings outside the tunnel or people outside the tunnel being injured by being hit; By setting the protection mechanism 3, when the rising protection plate 31 covers the tunnel entrance and there is a left and right spacing between the protection plate 31 and the tunnel entrance, the bidirectional screw rod 329 can be driven to rotate by the motor 2 3291, and the rotating bidirectional screw rod 329 moves away from each other through the nut 1 3292 and the nut 2 3293. At this time, the extension plate 1 326 and the extension plate 2 327 are respectively located on both sides of the protection plate 31, thereby expanding the protection position of the protection plate 31 to adapt to the expanded tunnel entrance. The device can further avoid the problem of buildings outside the tunnel or people outside the tunnel being injured by being hit.

[0031] In this embodiment, the lifting mechanism 2 includes a first guide column 22 and a second guide column 23 arranged on both sides of the protective plate 31, and the first guide column 22 and the second guide column 23 are both provided with a guide groove 229 arranged along the length direction thereof; a threaded column 223 arranged along the length direction of the guide groove 229 is provided in the guide groove 229, a guide plate 228 that can slide along the guide groove 229 is provided in the guide groove 229, and a nut 225 that cooperates with the threaded column 223 is provided at the guide plate 228; a mounting block 211 is provided at one end of the guide plate 228 away from the nut 225; a support plate 21 for supporting the protective plate 31 is provided below the protective plate 31; a connecting support rod 213 for connecting the support plate 21 and the mounting block 211 is provided between the support plate 21 and the mounting block 211; a motor 241 for driving the threaded column 223 to rotate is provided at the upper end of the first guide column 22; a mounting box 24 is provided at the lower end of the first guide column 22, and a linkage mechanism for linking the rotation of the threaded column 223 in the first guide column 22 and the second guide column 23 is provided in the mounting box 24.

[0032] Through this embodiment, workers drive the threaded column 223 in the first guide column 22 to rotate through the motor 1 241, and then drive the threaded column 223 in the second guide column 23 to rotate through the linkage mechanism; when the threaded column 223 in the first guide column 22 rotates, the threaded column 223 will drive the transmission shaft 1 243 to rotate, and the rotation of the transmission shaft 1 243 drives the driving wheel 245 to rotate, and then drives the driven wheel 246 to rotate through the transmission belt 247, and the driven wheel 246 rotates to drive the transmission shaft 244 and the threaded column 223 located in the second guide column 23 to rotate. At this time, the rotation of the threaded column 223 will cause the nut 225 to move along the threaded column 223, so that the nut 225 and the guide plate 228 rise or fall along the guide groove 229. When the guide plate 228 rises or falls, it will rise or fall with the mounting block 211 and the support rod 213, so that the protective plate 31 rises or falls, which makes it convenient for construction workers to adjust the position of the protective plate 31 so that the protective plate 31 can better block the tunnel entrance.

[0033] In this embodiment, the linkage mechanism includes a transmission shaft 1 243 and a transmission shaft 244 vertically arranged inside the installation box 24, and the transmission shaft 1 243 and the transmission shaft 2 244 are both rotatably connected to the installation box 24, the transmission shaft 1 243 is fixedly connected to the threaded column 223 in the first guide column 22, and the transmission shaft 244 is fixedly connected to the threaded column 223 in the second guide column 23; a driving wheel 245 is sleeved and installed on the side wall of the transmission shaft 1 243, and a driven wheel 246 is sleeved and installed on the side wall of the transmission shaft 244, a transmission belt 247 is arranged between the driving wheel 245 and the driven wheel 246, and the driving wheel 245 and the driven wheel 246 are connected by the transmission belt 247.

[0034] Through this embodiment, through the linkage mechanism, one motor can drive two threaded columns 223 to rotate at the same time, reducing the number of motors, thereby simplifying the structure of the entire system, making the equipment more compact and easy to install and maintain. In this embodiment, the extension mechanism 32 includes an extension shell 321 arranged along the length direction of the protective plate 31, and a mounting cavity 330 is arranged in the extension shell 321; a through hole 322 is arranged along the length direction of the extension shell 321 and communicated with the mounting cavity 330; a partition block 328 is arranged in the mounting cavity 330, and the partition block 328 divides the mounting cavity 330 into two sub-mounting cavities 310; a bidirectional screw rod 329 is arranged in the mounting cavity 330 along the length direction of the mounting cavity 330 and passes through the partition block 328; the bidirectional screw rod 329 is provided with a nut 1 3292 and a nut 2 3293 respectively located in the two sub-mounting cavities 310; A fixing plate 1 3294 and a fixing plate 2 3295 are respectively provided at the nut 1 3292 and the nut 2 3293; a support column 1 323 and a support column 2 324 extending out of the through hole 322 are respectively provided at the fixing plate 1 3294 and the fixing plate 2 3295; a connecting column 325 for connecting the extension plate 1 326 with the support column 1 323, and the extension plate 2 327 with the support column 2 324 is provided at the extension plate 1 326 and the extension plate 2 327; a motor 2 3291 for driving the bidirectional screw rod 329 to rotate is provided in the installation cavity 330.

[0035] According to the present embodiment, after the construction personnel have adjusted the upper and lower positions of the protective plate 31, the motor 2 3291 is started, and the motor 2 3291 drives the bidirectional screw 329 to rotate, and the bidirectional screw 329 rotates to push the nut 1 3292 and the nut 2 3293 to move toward or away from each other. At this time, the nut 1 3292 and the nut 2 3293 push the connecting column 325 and the extension plate 1 326 and the extension plate 2 327 to separate toward the two ends of the protective plate 31, thereby expanding the shielding area of ​​the protective plate 31; or shrinking inward to adapt to a smaller hole; When the nut 1 3292 and the nut 2 3293 move toward each other, they will eventually be blocked by the partition block 328, thereby preventing the nut 1 3292 and the nut 2 3293 from interfering with each other when they move toward each other and affecting the movement of the nut 1 3292 and the nut 2 3293.

[0036] In this embodiment, a slide rail 3297 is provided in the installation cavity 330 along the length direction of the installation cavity 330 and passes through the partition block 328 , and sliders 3296 are provided at both the fixing plate 1 3294 and the fixing plate 2 3295 ; the slide rail 3297 passes through the slider 3296 .

[0037] Through this embodiment, during the movement of nut 1 3292 and nut 2 3293, nut 1 3292 and nut 2 3293 drive fixed plate 1 3294 and fixed plate 2 3295 as well as slider 3296 to move along slide rail 3297. The slide rail 3297 makes the movement of nut 1 3292 and nut 2 3293 more stable, thereby greatly improving the stability of nut 1 3292 and nut 2 3293 during movement.

[0038] In this embodiment, one end of the support rod 213 is fixedly connected to the mounting block 211 , and the other end is detachably connected to the support plate 21 .

[0039] Through this embodiment, a buckle 214 is provided at one end of the support rod 213, and a slot matching the buckle 214 is provided at the lower end of the support plate 21, so that the support rod 213 connects the support plate 21 with the support rod 213 through the buckle 214 and the slot, and it is also convenient for construction personnel to disassemble and install the support plate 21.

[0040] In this embodiment, the fixing plate 1 3294 and the fixing plate 2 3295 are connected to the supporting column 1 323 and the supporting column 2 324 by bolts.

[0041] Through this embodiment, it is convenient for installers to connect and disassemble the fixing plate 1 3294 , the fixing plate 2 3295 and the supporting column 1 323 and the supporting column 2 324 .

[0042] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on one or several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0043] The present invention and its implementation methods are described schematically above, and the description is not restrictive. The embodiments shown in the embodiments are only part of the implementation methods of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the embodiments and designs a structure and an implementation method similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A tunnel blasting construction protection shed, characterized by: The invention comprises a housing (1), wherein a protective mechanism (3) is arranged inside the housing (1), wherein the protective mechanism (3) comprises a protective plate assembly for blocking a tunnel opening, wherein the protective plate assembly comprises a protective plate (31), wherein two sides of the protective plate (31) are respectively provided with an extension plate 1 (326) and an extension plate 2 (327); an extension mechanism (32) is arranged at the protective plate (31), wherein the extension mechanism (32) is used to push the extension plate 1 (326) and the extension plate 2 (327) to extend to both sides along the length direction of the protective plate (31); and a lifting mechanism (2) is also arranged inside the housing (1), wherein the lifting mechanism (2) is used to push the protective plate (31) to move along the height direction of the tunnel opening.

2. A tunnel blasting construction protection shed according to claim 1, characterized in that: The lifting mechanism (2) comprises a first guide column (22) and a second guide column (23) arranged on both sides of the protective plate (31); the first guide column (22) and the second guide column (23) are both provided with a guide groove (229) arranged along the length direction thereof; a threaded column (223) is arranged in the guide groove (229) along the length direction of the guide groove (229); a guide plate (228) that can slide along the guide groove (229) is arranged in the guide groove (229); a nut (225) that matches the threaded column (223) is arranged on the guide plate (228); the guide plate (228) is away from the nut (225); A mounting block (211) is provided at one end; a support plate (21) for supporting the protective plate (31) is provided below the protective plate (31); a support rod (213) for connecting the support plate (21) and the mounting block (211) is provided between the support plate (21) and the mounting block (211); a motor (241) for driving the threaded column (223) to rotate is provided at the upper end of the first guide column (22); a mounting box (24) is provided at the lower end of the first guide column (22), and a linkage mechanism for linking the first guide column (22) and the internal threaded column (223) of the second guide column (23) to rotate is provided in the mounting box (24).

3. A tunnel blasting construction protection shed according to claim 2, characterized in that: The linkage mechanism comprises a first transmission shaft (243) and a second transmission shaft (244) vertically arranged inside the installation box (24); the first transmission shaft (243) and the second transmission shaft (244) are both rotatably connected to the installation box (24); the first transmission shaft (243) is fixedly connected to a threaded column (223) in a first guide column (22); the second transmission shaft (244) is fixedly connected to a threaded column (223) in a second guide column (23); a driving wheel (245) is sleeved and installed on the side wall of the first transmission shaft (243); a driven wheel (246) is sleeved and installed on the side wall of the second transmission shaft (244); a transmission belt (247) is arranged between the driving wheel (245) and the driven wheel (246); the driving wheel (245) and the driven wheel (246) are connected via the transmission belt (247).

4. A tunnel blasting construction protection shed according to claim 2, characterized in that: The extension mechanism (32) comprises an extension shell (321) arranged along the length direction of the protective plate (31), wherein a mounting cavity (330) is arranged in the extension shell (321); a through hole (322) is arranged along the length direction of the extension shell (321) and communicates with the mounting cavity (330) is arranged at the extension shell (321); a partition block (328) is arranged in the mounting cavity (330), and the partition block (328) divides the mounting cavity (330) into two sub-mounting cavities (310); a bidirectional screw rod (329) is arranged in the mounting cavity (330) along the length direction of the mounting cavity (330) and passes through the partition block (328); and a screw nut 1 (3292) and a screw nut 2 (3293) are arranged on the bidirectional screw rod (329), which are respectively located in the two sub-mounting cavities (310); A fixing plate 1 (3294) and a fixing plate 2 (3295) are provided at the nut 1 (3292) and the nut 2 (3293), respectively; a supporting column 1 (323) and a supporting column 2 (324) extending out of the through hole (322) are provided at the fixing plate 1 (3294) and the fixing plate 2 (3295), respectively; a connecting column (325) for connecting the extension plate 1 (326) and the supporting column 1 (323), and the extension plate 2 (327) and the supporting column 2 (324) is provided at the extension plate 1 (326) and the extension plate 2 (327); and a motor 2 (3291) for driving the bidirectional screw rod (329) to rotate is provided in the installation cavity (330).

5. A tunnel blasting construction protection shed according to claim 4, characterized in that: A slide rail (3297) is provided in the installation cavity (330) and is arranged along the length direction of the installation cavity (330) and passes through the partition block (328). Slide blocks (3296) are provided at both the first fixing plate (3294) and the second fixing plate (3295); and the slide rail (3297) passes through the slide block (3296).

6. A tunnel blasting construction protection shed according to claim 2, characterized in that: One end of the support rod (213) is fixedly connected to the mounting block (211), and the other end is detachably connected to the support plate (21).

7. The tunnel blasting construction protection shed according to claim 4, characterized in that: The fixing plate 1 (3294) and the fixing plate 2 (3295) are connected to the supporting column 1 (323) and the supporting column 2 (324) by bolts.

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