Tunnel construction protection device

Abstract

The application belongs to the technical field of tunnel construction, and particularly relates to a tunnel construction protection device, which comprises a protection frame body and a protection curtain, wherein the protection curtain comprises a flexible connecting belt and a plurality of curtain fabric strips; the plurality of curtain fabric strips are evenly distributed on the flexible connecting belt; one end of the flexible connecting belt is provided with a connecting piece, and the other end of the flexible connecting belt is provided with a limiting column; an arc-shaped supporting frame and an operation platform are arranged on the protection frame body, the arc-shaped supporting frame is provided with a moving trolley and a mounting track; the moving trolley comprises a trolley body, a limiting lug plate and a limiting plate; the limiting plate is in sliding connection with the trolley body, and a driving cylinder is arranged between the limiting plate and the trolley body; the trolley body is provided with a supporting wheel and a driving wheel which are connected with the arc-shaped supporting frame; and a hook plate is fixed to the limiting plate; when the connecting piece is connected with the hook plate, the flexible connecting belt is moved along the mounting track by the moving trolley. The device realizes the rapid conversion of blasting protection and pipe shed construction through the structures such as the detachable protection curtain and the moving trolley.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tunnel construction, and particularly relates to a tunnel construction protection device. BACKGROUND

[0002] Tunnel engineering is a key link in modern transportation, water conservancy, mine and other infrastructure construction, and has complex construction environment and high safety risk.

[0003] In the process of tunnel excavation, blasting operation is a common means to break hard rock, but flying stones, shock waves and dust generated by blasting pose a serious threat to construction personnel and equipment. Therefore, a reliable protection device must be set up in the blasting area. In addition, before entering the tunnel or passing through the soft surrounding rock section, the pipe shed supporting technology is often used for pre-reinforcement, that is, a support system is formed by drilling and implanting steel pipes and pouring concrete to ensure the stability of the excavation face.

[0004] At present, the protection device in tunnel construction mostly adopts fixed steel structure support combined with simple shielding materials such as steel plate or canvas. These traditional devices have obvious shortcomings: first, the function is single, the protection structure is usually used for blasting isolation or simple operation platform, which is difficult to adapt to the demand of multi-process cross operation, resulting in low equipment utilization and complicated conversion; second, the installation efficiency is low, the protection curtain mostly depends on manual high-altitude laying and fixing, which not only has high labor intensity, but also is easy to shift or fall off under the impact of blasting, and has poor safety reliability; third, the drilling and pouring links in pipe shed construction lack integrated auxiliary equipment, the drill rod is easy to deviate from the design angle when drilling, which affects the precision of the pipe shed, and the position of the pipe needs to be adjusted repeatedly when pouring concrete, which increases the operation difficulty and risk.

[0005] In summary, there is an urgent need in the field for a tunnel construction protection device integrating blasting protection and pipe shed construction functions. SUMMARY

[0006] In view of the above technical problems, the present application provides a tunnel construction protection device which integrates blasting protection and pipe shed construction functions.

[0007] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0008] A tunnel construction protection device, comprising a protection frame body and a protection curtain.

[0009] The protection curtain comprises a flexible connecting belt and a plurality of curtain cloth strips; the plurality of curtain cloth strips are evenly distributed on the flexible connecting belt; one end of the flexible connecting belt is provided with a connecting piece, and the other end of the flexible connecting belt is provided with a limiting column; the protection frame body is provided with an arc-shaped support frame and an operation platform, and the arc-shaped support frame is provided with a mobile trolley and a mounting rail; the flexible connecting belt is provided with a metal column.

[0010] The mobile trolley includes a body, limiting ear plates, and a limiting plate; the limiting plate is slidably connected to the body, and a drive cylinder is provided between the limiting plate and the body; the body is provided with support wheels and drive wheels connected to an arc-shaped support frame; a hook plate is fixed on the limiting plate, and when the connector is connected to the hook plate, the flexible connecting belt is pulled by the mobile trolley to move along the installation track until the limiting post abuts against the installation track; when the hook plate contacts the installation track, it can prevent the movement of the body; the limiting ear plate is provided with an oblong hole, and the limiting plate is provided with a groove, forming a limiting hole between the groove and the oblong hole; a sliding plate is slidably connected to the body, a support post is fixedly connected to the sliding plate, and an auxiliary support tube is connected to the support post; a limiting component is provided on the support post.

[0011] The drive wheel is connected to a drive motor, and the housing of the drive motor is fixedly connected to the vehicle body; there are two support wheels, both of which are in contact with the outer surface of the mounting track; the arc-shaped support frame is provided with guide grooves that cooperate with the drive wheels.

[0012] The mobile trolley also includes auxiliary wheels, which are rotatably connected to the trolley body and contact the side of the mounting track.

[0013] The limiting ear plate is provided with a nozzle; at least two nozzles are provided.

[0014] The auxiliary support tube is rotatably connected to the support column, and a drive plate is fixed on the auxiliary support tube. The drive plate has an inclined surface. The limiting plate has a connecting column. When the connecting column moves, it cooperates with the inclined surface on the drive plate to push the auxiliary support tube to rotate.

[0015] A first limiting block is fixed on the support column, and a second limiting block that cooperates with the first limiting block is provided on the auxiliary support tube.

[0016] The limiting assembly includes a first limiting rod and a second limiting rod, both of which are slidably connected to the support column. A spring is provided between the first limiting rod, the second limiting rod, and the support column. A tapered surface is provided at the end of both the first limiting rod and the second limiting rod.

[0017] An adjusting column is threaded onto the support column. The front end of the adjusting column is conical and located between the ends of the first limiting rod and the second limiting rod. The adjusting column pushes the first limiting rod and the second limiting rod to move, so that the front end of the first limiting rod extends into the auxiliary support tube. The front end of the second limiting rod passes through the sliding plate and contacts the vehicle body.

[0018] It also includes a moving mechanism; the moving mechanism includes a moving frame and a driving mechanism; there are two driving mechanisms, which are respectively located on both sides of the moving frame; the moving frame is bolted to the protective frame body;

[0019] The movable frame is equipped with a fixed plate; the fixed plate is fixedly connected to the movable frame; the movable frame is slidably connected to a movable plate, and the movable plate is connected to a telescopic cylinder. The telescopic cylinder drives the movable plate to move and clamp the lower ends of several curtain strips.

[0020] The movable frame is hinged to a support leg; the two ends of the telescopic cylinder are respectively hinged to the support leg and the movable plate.

[0021] The drive mechanism is a wheel-type mechanism.

[0022] The protective frame consists of a left frame and a right frame, which are connected by bolts.

[0023] Compared with the prior art, the beneficial effects of this invention are:

[0024] This device, through its detachable protective curtain and mobile trolley structure, enables rapid conversion between blast protection and pipe roof construction. The protective curtain, composed of flexible connecting strips and fabric strips, is automatically pulled and installed along the installation track by the mobile trolley, eliminating the need for extensive manual high-altitude work. The flexible connecting strips incorporate embedded metal columns for enhanced support, and, combined with the friction-limiting mechanism between the hook plate and the installation track, effectively prevent the protective curtain from loosening and falling off under blast impact.

[0025] The mobile trolley is equipped with a limiting hole structure, and the hole diameter is adjusted by the drive cylinder to provide adjustable guidance for the drill rod, avoid deviation of the drilling angle, and ensure the positioning accuracy of the pipe roof construction; during the pouring operation, the trolley can drive the pouring pipe to move precisely, realizing alternating pouring from left to right.

[0026] The protective frame adopts a modular split design (such as left and right frames) for easy transportation and assembly; integrated nozzles spray dust to improve the working environment; limit components can quickly fix the pouring pipe and slide plate to improve operational safety; the drive plate and connecting column work together to realize automatic lifting and resetting of the pouring pipe.

[0027] The addition of a movable mechanism makes the entire device movable, adapting to the needs of different construction sections; the use of a movable plate to clamp the lower end of the fabric strip further enhances the overall impact resistance. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the protective curtain in Embodiment 1 of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the protective curtain after installation in Embodiment 1 of the present invention;

[0031] Figure 4 yes Figure 1 A magnified view of a section at point A in the middle;

[0032] Figure 5 This is a schematic diagram of the structure of the mobile trolley in one direction in Embodiment 1 of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the mobile trolley in another direction in Embodiment 1 of the present invention;

[0034] Figure 7 This is a schematic diagram of the connection structure between the auxiliary support tube and the sliding plate in Embodiment 1 of the present invention;

[0035] Figure 8 yes Figure 7 A cross-sectional view of the structure shown;

[0036] Figure 9 This is a schematic diagram of the overall structure in one direction of Embodiment 2 of the present invention;

[0037] Figure 10 This is a schematic diagram of the overall structure from another direction of Embodiment 2 of the present invention;

[0038] Wherein: 1 is the protective frame, 10 is the left frame, 11 is the right frame, 2 is the protective curtain, 20 is the flexible connecting belt, 21 is the curtain strip, 22 is the connector, 23 is the limiting post, 24 is the metal post, 3 is the arc-shaped support frame, 4 is the operating platform, 5 is the mobile trolley, 50 is the trolley body, 51 is the limiting ear plate, 52 is the limiting plate, 53 is the support wheel, 54 is the drive wheel, 55 is the drive cylinder, 56 is the limiting hole, 57 is the hook plate, 58 is the sliding plate, 59 is the support post, 510 is the trolley body. 511 is the drive motor, 512 is the auxiliary wheel, 513 is the nozzle, 514 is the drive plate, 515 is the connecting column, 516 is the first limiting block, 517 is the second limiting block, 518 is the adjusting column, 519 is the auxiliary support tube, 520 is the first limiting rod, 521 is the second limiting rod, 6 is the mounting rail, 7 is the moving mechanism, 70 is the moving frame, 71 is the drive mechanism, 72 is the fixed plate, 73 is the movable plate, 74 is the telescopic cylinder, and 75 is the support leg. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] Example 1

[0041] like Figures 1 to 3 As shown, a tunnel construction protection device includes a protective frame 1 and a protective curtain 2. The protective frame 1 mainly serves a supporting function; the protective curtain 2 mainly serves a protective function. The protective curtain 2 is a detachable structure and can be installed on the protective frame 1 as needed, specifically through the following structure.

[0042] The protective curtain 2 includes a flexible connecting strip 20 and several curtain strips 21; the several curtain strips 21 are evenly distributed on the flexible connecting strip 20. The flexible connecting strip 20 can be bent and deformed, and metal pillars 24 are embedded in the flexible connecting strip 20.

[0043] A connector 22 is provided at one end of the flexible connecting strip 20, and a limiting post 23 is provided at the other end of the flexible connecting strip 20. An arc-shaped support frame 3 and an operating platform 4 are provided on the protective frame 1. A moving trolley 5 and an installation track 6 are provided on the arc-shaped support frame 3. The installation track 6 is used to install the flexible connecting strip 20, and the aforementioned metal post 24 provides support to prevent the flexible connecting strip 20 from being dislodged from the installation track 6 by external force. The connector 22 can be a hook, rope loop, etc.

[0044] like Figures 4 to 6 As shown, the mobile trolley 5 includes a body 50, a limiting ear plate 51, and a limiting plate 52; the limiting plate 52 is slidably connected to the body 50, and a drive cylinder 55 is provided between the limiting plate 52 and the body 50; both ends of the drive cylinder 55 are fixedly connected to the limiting plate 52 and the body 50, respectively. The limiting plate 52 can be moved by the extension and retraction of the drive cylinder 55.

[0045] The vehicle body 50 is equipped with a support wheel 53 and a drive wheel 54 connected to the arc-shaped support frame 3. The arc-shaped support frame 3 is located between the support wheel 53 and the drive wheel 54, meaning that the vehicle body 50 can be "clamped" on the arc-shaped support frame 3 by the support wheel 53 and the drive wheel 54. The rotation of the drive wheel 54 drives the vehicle body 50 to move along the arc-shaped support frame 3.

[0046] A hook plate 57 is fixed on the limiting plate 52. After the connector 22 is connected to the hook plate 57, one end of the flexible connecting strip 20 is manually inserted into the installation track 6. Then, the flexible connecting strip 20 is pulled along the installation track 6 by the moving trolley 5 until the limiting post 23 abuts against the installation track 6, completing the installation of the flexible connecting strip 20. The curtain strip 21 hangs down under the action of gravity to form a protective barrier, blocking the debris generated by the blast and playing a buffering role. The curtain strip 21 can be made of rubber.

[0047] When the piston rod of the drive cylinder 55 moves, causing the hook plate 57 to contact the mounting rail 6, the friction between the hook plate 57 and the mounting rail 6 will hinder the movement of the vehicle body 50. Therefore, if the vehicle body 50 needs to stop at any position on the arc-shaped support frame 3, it can do so by having the hook plate 57 contact the mounting rail 6.

[0048] The flexible connecting belt 20 is moved along the installation track 6 by the trolley 5 until the limit post 23 abuts against the installation track 6. Then, the hook plate 57 contacts the installation track 6 to prevent the trolley 50 from moving the flexible connecting belt 20 at will and to prevent it from loosening.

[0049] When the protective curtain 2 is installed, the protective device can be used for protective operations during blasting operations; when the protective curtain 2 is not installed, the protective device can also be used for tunnel pipe roof construction operations.

[0050] Specifically: The protective frame 1 is placed at the opening where pipe shed construction is required; the protective frame 1 is equipped with an operating platform 4, on which workers can stand to carry out construction work.

[0051] The limiting ear plate 51 has an oblong hole, and the limiting plate 52 has a groove, forming a limiting hole 56 between the groove and the oblong hole. This limiting hole 56 can serve as a limiting and guiding function during the drilling operation (using a down-the-hole drill) of the pipe shed. Since the limiting plate 52 can be moved by the drive cylinder 55, the size of the limiting hole 56 can be adjusted as needed.

[0052] During the drilling operation, the size of the limiting hole 56 formed by the moving limit plate 52 can be reduced, allowing the drill rod to have less room to move and preventing angular deviation. When the drilling angle is incorrect, the limit plate 52 moves in the opposite direction to increase the size of the limiting hole 56, allowing the drill rod to have more room to move and thus adjust the angle.

[0053] During the construction of the pipe shed, concrete pouring is also required; the concrete pouring is generally done by alternating pouring from left to right (there are two pouring ports on the left and right sides above the formwork).

[0054] A sliding plate 58 is slidably connected to the vehicle body 50, and a support column 59 is fixedly connected to the sliding plate 58. An auxiliary support pipe 519 is connected to the support column 59; a limiting component is provided on the support column 59. When pouring is required, the sliding plate 58 is pushed to move so that the opening of the auxiliary support pipe 519 is aligned with the limiting ear plate 51; then the pouring pipe is passed through the oblong hole of the limiting ear plate 51 and the auxiliary support pipe 519 in sequence and extends out; finally, the position of the pouring pipe and the sliding plate 58 is fixed by the limiting component.

[0055] In this way, during the alternating pouring operation, the pouring pipe can be moved left and right by the movement of the vehicle body 50, which helps to complete the pouring operation.

[0056] Furthermore, such as Figure 1 As shown, for ease of transportation, the protective frame 1 includes a left frame 10 and a right frame 11, which are connected by bolts. Similarly, the arc-shaped support frame 3 can also be divided into left and right parts.

[0057] Furthermore, such as Figure 5As shown, the drive wheel 54 is connected to the drive motor 510, and the housing of the drive motor 510 is fixedly connected to the vehicle body 50; two support wheels 53 are provided, and both support wheels 53 are in contact with the outer surface of the mounting rail 6; the arc-shaped support frame 3 is provided with a guide groove that cooperates with the drive wheel 54, and the drive wheel 54 is located in the guide groove. The output shaft of the drive motor 510 is fixedly connected to the drive wheel 54, and the drive motor 510 drives the drive wheel 54 to rotate.

[0058] Furthermore, such as Figure 4 and Figure 5 As shown, the mobile trolley 5 also includes an auxiliary wheel 511, which is rotatably connected to the trolley body 50 and contacts the side of the mounting track 6.

[0059] Furthermore, such as Figure 4 As shown, a nozzle 512 is provided on the limiting ear plate 51; at least two nozzles 512 are provided. The nozzles 512 are connected to water pipes and water pumps; when drilling operations are performed, dust is suppressed by spraying water through the nozzles 512.

[0060] Furthermore, such as Figures 4 to 6 As shown, the auxiliary support pipe 519 is rotatably connected to the support column 59. A drive plate 513 is fixed on the auxiliary support pipe 519, and the drive plate 513 has an inclined surface. A connecting column 514 is provided on the limiting plate 52. During the alternating pouring operation, when it is necessary to transfer from the left pouring port to the right pouring port, the piston rod of the drive cylinder 55 moves, driving the limiting plate 52 and the connecting column 514 to move. After the connecting column 514 moves, it cooperates with the inclined surface on the drive plate 513 to push the auxiliary support pipe 519 to rotate upward, lifting the pouring pipe and moving it out of the left pouring port.

[0061] A first limiting block 515 is fixed on the support column 59, and a second limiting block 516 that cooperates with the first limiting block 515 is provided on the auxiliary support pipe 519. When it moves to the right pouring port, the piston rod of the drive cylinder 55 moves, causing the limiting plate 52 and the connecting column 514 to move in the opposite direction; under the gravity of the pouring pipe, the auxiliary support pipe 519 is driven to rotate downward until the second limiting block 516 contacts the first limiting block 515, at which point the pouring pipe extends into the right pouring port.

[0062] It should be noted that after the piston rod of the drive cylinder 55 moves, causing the limit plate 52 and the connecting column 514 to move, there is still a certain gap between the hook plate 57 and the mounting rail 6, which will not hinder the movement of the vehicle body 50.

[0063] Furthermore, such as Figure 7 and Figure 8As shown, the limiting assembly includes a first limiting rod 520 and a second limiting rod 521. Both the first limiting rod 520 and the second limiting rod 521 are slidably connected to the support column 59. A spring 517 is provided between the first limiting rod 520 and the second limiting rod 521 and the support column 59. The ends of the first limiting rod 520 and the second limiting rod 521 are provided with a conical surface.

[0064] An adjusting column 518 is threaded onto the support column 59. The front end of the adjusting column 518 is conical and is located between the ends of the first limiting rod 520 and the second limiting rod 521. The front end of the adjusting column 518 can contact the conical surfaces of the ends of the first limiting rod 520 and the second limiting rod 521.

[0065] When it is necessary to fix the position of the pouring pipe and the slide plate 58, simply rotate the adjusting column 518. The adjusting column 518 moves forward, pushing the first limiting rod 520 and the second limiting rod 521 to move, so that the front end of the first limiting rod 520 extends into the auxiliary support pipe 519 and contacts the pouring pipe, and the front end of the second limiting rod 521 passes through the slide plate 58 and contacts the vehicle body 50; thereby achieving the fixation of the position of the pouring pipe and the slide plate 58.

[0066] Example 2

[0067] To facilitate overall movement during blast protection, a moving mechanism 7 was added based on Example 1.

[0068] like Figures 9 to 10 As shown, the moving mechanism 7 includes a moving frame 70 and a drive mechanism 71; there are two drive mechanisms 71, which are respectively located on both sides of the moving frame 70. The moving frame 70 is bolted to the protective frame body 1 and can be disassembled as needed; it is connected for blast protection and disassembled for pipe shed construction.

[0069] A fixed plate 72 is provided on the movable frame 70; the fixed plate 72 is fixedly connected to the movable frame 70; a movable plate 73 is slidably connected to the movable frame 70, and a telescopic cylinder 74 is connected to the movable plate 73. When used for blast protection, the lower ends of several curtain strips 21 are placed between the movable plate 73 and the fixed plate 72; and the telescopic cylinder 74 drives the movable plate 73 to move and clamp the lower ends of several curtain strips 21, thereby fixing them and preventing the curtain strips 21 from moving randomly due to impact from gravel during the blast.

[0070] Furthermore, a support leg 75 is hinged to the movable frame 70; the two ends of the telescopic cylinder 74 are respectively hinged to the support leg 75 and the movable plate 73. When used for blast protection, the piston rod of the telescopic cylinder 74 extends, which can push the movable plate 73 to move on the one hand, and drive the support leg 75 to rotate on the other hand, so that the support leg 75 contacts the ground and plays a supporting role.

[0071] Furthermore, the aforementioned drive mechanism 71 can be a wheeled mechanism, or of course, a tracked mechanism.

[0072] The above description only illustrates preferred embodiments of the present invention, but the present invention is not limited to the above embodiments.

Claims

1. A tunnel construction protection device, characterized in that: Includes a protective frame (1) and a protective curtain (2); The protective curtain (2) includes a flexible connecting strip (20) and several curtain strips (21); the several curtain strips (21) are evenly distributed on the flexible connecting strip (20); one end of the flexible connecting strip (20) is provided with a connector (22), and the other end of the flexible connecting strip (20) is provided with a limiting post (23); the protective frame (1) is provided with an arc-shaped support frame (3) and an operating platform (4), and the arc-shaped support frame (3) is provided with a moving trolley (5) and an installation track (6); the flexible connecting strip (20) is provided with a metal post (24); The mobile trolley (5) includes a body (50), a limiting ear plate (51), and a limiting plate (52); the limiting plate (52) is slidably connected to the body (50), and a drive cylinder (55) is provided between the limiting plate (52) and the body (50); the body (50) is provided with a support wheel (53) and a drive wheel (54) connected to the arc-shaped support frame (3); a hook plate (57) is fixed on the limiting plate (52), and when the connecting piece (22) is connected to the hook plate (57), the flexible connecting belt (20) is pulled along the installation rail by the mobile trolley (5). The track (6) moves until the limiting post (23) abuts against the mounting track (6); when the hook plate (57) contacts the mounting track (6), it can prevent the movement of the vehicle body (50); the limiting ear plate (51) is provided with a waist-shaped hole, the limiting plate (52) is provided with a groove, and the groove and the waist-shaped hole form a limiting hole (56); the vehicle body (50) is slidably connected with a sliding plate (58), the sliding plate (58) is fixedly connected with a support column (59), and the support column (59) is connected with an auxiliary support tube (519); the support column (59) is provided with a limiting component; The auxiliary support tube (519) is rotatably connected to the support column (59). A drive plate (513) is fixed on the auxiliary support tube (519), and an inclined surface is provided on the drive plate (513). A connecting column (514) is provided on the limiting plate (52). When the connecting column (514) moves, it cooperates with the inclined surface on the drive plate (513) to push the auxiliary support tube (519) to rotate. The support column (59) is fixed with a first limiting block (515), and the auxiliary support tube (519) is provided with a second limiting block (516) that cooperates with the first limiting block (515).

2. The tunnel construction protection device according to claim 1, characterized in that: The drive wheel (54) is connected to the drive motor (510), and the housing of the drive motor (510) is fixedly connected to the vehicle body (50); there are two support wheels (53), and both support wheels (53) are in contact with the outer surface of the mounting track (6); the arc-shaped support frame (3) is provided with a guide groove that cooperates with the drive wheel (54).

3. A tunnel construction protection device according to claim 1 or 2, characterized in that: The mobile trolley (5) also includes an auxiliary wheel (511), which is rotatably connected to the trolley body (50) and contacts the side of the mounting track (6).

4. A tunnel construction protection device according to claim 1, characterized in that: The limiting ear plate (51) is provided with a nozzle (512); at least two nozzles (512) are provided.

5. A tunnel construction protection device according to claim 1, characterized in that: The limiting assembly includes a first limiting rod (520) and a second limiting rod (521). Both the first limiting rod (520) and the second limiting rod (521) are slidably connected to the support column (59). A spring (517) is provided between the first limiting rod (520) and the second limiting rod (521) and the support column (59). The ends of both the first limiting rod (520) and the second limiting rod (521) are provided with a conical surface. An adjusting column (518) is threaded onto the support column (59). The front end of the adjusting column (518) is conical and located between the ends of the first limiting rod (520) and the second limiting rod (521). The adjusting column (518) pushes the first limiting rod (520) and the second limiting rod (521) to move, so that the front end of the first limiting rod (520) extends into the auxiliary support tube (519). The front end of the second limiting rod (521) passes through the slide plate (58) and contacts the vehicle body (50).

6. A tunnel construction protection device according to claim 1, characterized in that: It also includes a moving mechanism (7); the moving mechanism (7) includes a moving frame (70) and a driving mechanism (71); there are two driving mechanisms (71), which are respectively located on both sides of the moving frame (70); the moving frame (70) is bolted to the protective frame body (1); The movable frame (70) is provided with a fixed plate (72); the fixed plate (72) is fixedly connected to the movable frame (70); the movable frame (70) is slidably connected with a movable plate (73), and the movable plate (73) is connected with a telescopic cylinder (74). The telescopic cylinder (74) drives the movable plate (73) to move and clamp the lower ends of several curtain strips (21).

7. A tunnel construction protection device according to claim 6, characterized in that: The movable frame (70) is hinged to a support leg (75); the two ends of the telescopic cylinder (74) are respectively hinged to the support leg (75) and the movable plate (73).

8. A tunnel construction protection device according to claim 6, characterized in that: The drive mechanism (71) adopts a wheel mechanism.

9. A tunnel construction protection device according to claim 1, characterized in that: The protective frame (1) includes a left frame (10) and a right frame (11), which are connected by bolts.

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