Protection structure for temporary support in blasting construction of subsurface tunnel

Abstract

The utility model discloses a protection structure for temporary support in underground excavation tunnel blasting construction, which comprises an arched support frame, buffer mechanisms are arranged on the outer side of the arched support frame at equal intervals, a U-shaped support frame is arranged in the arched support frame, a top end support mechanism is mounted at the top of the U-shaped support frame, and the top end support mechanism is in contact with the inner wall of the arched support frame. Lateral supporting mechanisms are arranged on the two corresponding side walls of the U-shaped supporting frame, lifting grooves are formed in the two corresponding side walls of the U-shaped supporting frame, lifting plates are slidably connected into the lifting grooves in a matched mode, the two lateral supporting mechanisms are installed on the surfaces of the two lifting plates correspondingly, and the buffering mechanism comprises an arc-shaped plate, a buffering spring and an anchor rod. And the anchor rods are installed on the outer sides of the installation grooves at equal intervals, when vibration is generated during blasting construction, the buffer springs of the device can achieve the efficient buffer effect, the device is effectively protected, stable supporting of a tunnel is achieved, and meanwhile the device can adapt to supporting of the inner walls of arch-shaped supporting frames with different heights.

Description

Technical Field

[0001] This utility model relates to the field of tunnel and underground engineering technology, specifically a protective structure for temporary support during blasting construction of mined tunnels. Background Technology

[0002] With the increasing development of urban construction, underground space construction is becoming more and more widespread due to the constraints of the surrounding environment. In the construction of underground tunnels, the safety and quality control of blasting construction technology in hard rock layers are particularly important, as the blasting has strong destructive power and can easily damage the tunnel.

[0003] Traditional temporary support devices for tunnel construction typically support the tunnel wall directly through support components, lacking corresponding buffer structures. During tunnel blasting, significant vibrations can easily occur within the tunnel, leading to substantial impacts and damage to the support structure, resulting in poor tunnel support effectiveness. Furthermore, existing temporary support devices are not easily movable, making it extremely inconvenient to move the devices when supporting different parts of the tunnel. Moreover, existing temporary support devices are not easily adjustable, resulting in poor fit and inadequate support for tunnels with varying inner diameters. Therefore, we propose a protective structure for temporary support in blasting construction of mined tunnels. Utility Model Content

[0004] The purpose of this utility model is to provide a protective structure for temporary support in blasting construction of mined tunnels, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a protective structure for temporary support in blasting construction of a tunnel, comprising an arched support frame, buffer mechanisms equidistantly arranged on the outer side of the arched support frame, a U-shaped support frame arranged inside the arched support frame, a top support mechanism installed on the top of the U-shaped support frame and in contact with the inner wall of the arched support frame, lateral support mechanisms arranged on the corresponding two side walls of the U-shaped support frame, lifting grooves opened on the corresponding two side walls of the U-shaped support frame, and lifting plates slidably connected in the lifting grooves, two lateral support mechanisms respectively installed on the surfaces of two lifting plates, the buffer mechanism comprising an arc plate, a buffer spring and an anchor rod, anchor rods equidistantly installed on the outer side of the mounting groove, and the ends of the anchor rods passing through the mounting groove, an arc plate slidably connected on the outer side of the anchor rod, a buffer spring sleeved on the outer side of the anchor rod between the mounting groove and the arc plate, and the two ends of the buffer spring being fixedly connected to the mounting groove and the arc plate respectively.

[0006] Preferably, the top support mechanism includes a fixed plate, a first bidirectional screw, a first motor, a slider, a support plate, and an arc-shaped top plate. Fixed plates are fixedly connected to both ends of the top of the U-shaped support frame, and a first bidirectional screw is rotatably connected between the two fixed plates. Sliders are symmetrically threaded to both ends of the first bidirectional screw, and the bottom of the sliders is slidably connected to the top of the U-shaped support frame. A first motor is fixedly installed at one end of the top of the U-shaped support frame, and the output shaft end of the first motor passes through the fixed plate and is fixed to the first bidirectional screw. Support plates are rotatably connected to the top ends of both first bidirectional screws, and arc-shaped top plates are connected to the ends of the two support plates. The arc-shaped top plate is supported on the inner wall of the arched support frame, and mounting blocks are symmetrically arranged at the bottom of the arc-shaped top plate. The ends of the two support plates are rotatably connected to the two mounting blocks respectively.

[0007] Preferably, a fixed seat is fixedly connected to the top center of the U-shaped support frame, the first bidirectional screw passes through the fixed seat, support blocks are symmetrically arranged at both ends of the top of the fixed seat, and an adjusting rod is rotatably connected to the top of the support block. A support spring is fixedly connected between the top of the fixed seat and the adjusting rod. Vertical plates are fixedly connected to both ends of the top of the fixed seat between the two adjusting rods. A positioning rod is fixedly connected to the top of the vertical plate. A strip groove is opened on the surface of the adjusting rod, and the positioning rod is slidably connected in the strip groove. An installation plate is slidably connected between the four adjusting rods. A support cylinder is fixedly connected to the top of the installation plate, and a support rod is slidably arranged inside the support cylinder. An arc-shaped top plate is fixedly connected to the top of the support rod. An adjusting bolt is provided at the top of the support cylinder, and the support rod and the support cylinder are fixedly connected by the adjusting bolt.

[0008] Preferably, a connecting plate is fixedly connected to the top of the two lifting plates. The lateral support mechanism includes a U-shaped seat, a third bidirectional screw, a moving block, a mounting rod, a lateral top plate, a worm gear, a worm, and a third motor. The third bidirectional screw is rotatably connected inside the U-shaped seat. The two ends of the third bidirectional screw are symmetrically threaded to the moving blocks. The moving blocks are slidably connected inside the U-shaped seat. The ends of the moving blocks are rotatably connected to the mounting rods. The ends of the two mounting rods are connected to the lateral top plate. The lateral top plate is symmetrically arranged with connecting blocks. The two mounting rods are rotatably connected to the two connecting blocks respectively. The end of the third bidirectional screw passes through the U-shaped seat and is fixedly connected to the worm gear. The worm is rotatably arranged inside the connecting plate. The two ends of the worm pass through the two lifting plates and are meshed with the two worm gears respectively. The third motor is fixedly installed on the side wall of the lifting plate, and the output shaft end of the third motor is fixedly connected to the worm.

[0009] Preferably, the top of the U-shaped support frame is symmetrically rotatably connected to a second bidirectional screw. The ends of the two second bidirectional screws are fixedly connected to pulleys through the U-shaped support frame, and the two pulleys are connected by belt drive. A second motor is fixedly installed at the top of the U-shaped support frame, and the output shaft end of the second motor passes through the U-shaped support frame and is fixedly connected to the second bidirectional screw. The two ends of the second bidirectional screw are symmetrically threaded with sliding blocks. The top of the sliding block is slidably connected to the inner wall of the U-shaped support frame, and the bottom of the sliding block is rotatably connected to an adjusting plate. The lifting plate is symmetrically fixed with lifting blocks on one side inside the U-shaped support frame, and the end of the adjusting plate is rotatably connected to the lifting blocks.

[0010] Preferably, buffer pads are fixedly connected to the outer sides of both the arc-shaped top plate and the side top plate.

[0011] Preferably, the bottom ends of the U-shaped support frame are fixedly connected to a fixed base plate, and the bottom four corners of the fixed base plate are fixedly connected to a fixed rod.

[0012] Preferably, the bottom end of the U-shaped support frame is connected to a lifting seat, the top of the lifting seat is provided with a limiting groove, the U-shaped support frame is slidably connected in the limiting groove, the fixed base plate and the fixed rod are located inside the lifting seat, and universal wheels are installed at the four corners of the bottom of the lifting seat.

[0013] Preferably, the top of the fixed base plate is symmetrically rotatably connected with threaded rods, and the top of the threaded rods is fixedly connected with a turntable. The bottom of the lifting seat has a connecting opening, and the width of the connecting opening is greater than the distance between the two fixed rods.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model, through the setting of a buffer mechanism, ensures that after the arched support frame is installed on the inner wall of the tunnel, the arc-shaped plate on the outer side of the arched support frame fits against the inner wall of the tunnel. Then, concrete is sprayed onto the inner wall of the tunnel, and anchor rods are installed to stabilize the ends of the anchor rods inside the concrete. This allows the arched support frame to provide stable support for the inner wall of the tunnel. When vibrations are generated during blasting operations, the buffer spring can provide an efficient buffering effect, effectively protecting the device and achieving stable support for the tunnel.

[0016] 2. This utility model can achieve stable support for the top of the inner wall of the arched support frame through the top support mechanism. By controlling the first motor to rotate the first bidirectional screw, the two sliders are brought closer together through the threaded connection between the two sliders and the first bidirectional screw. Then, under the action of the support plate, the arc-shaped top plate is raised and pressed tightly against the top of the inner wall of the arched support frame. This allows it to adapt to the support of the inner wall of the arched support frame at different heights, thus expanding its application range.

[0017] 3. This utility model, through the coordinated arrangement of support springs, adjusting rods, upright plates, positioning rods, strip grooves, mounting plates, support cylinders, and support rods, can strengthen the support for the top of the inner wall of the arch support frame. The support springs provide a buffering effect, preventing the arch support frame from deforming due to the large impact of blasting vibrations.

[0018] 4. This utility model uses a second motor to rotate a second bidirectional screw. The threaded connection between the second bidirectional screw and the sliding block allows control of the two sliding blocks to move closer or further apart. Under the action of the adjusting plate, the lifting and lowering of the lateral support mechanism can be controlled. Thus, the support position of the lateral top plate can be adjusted according to the arched position of the inner wall of the arched support frame to achieve optimal support and enhance the stability of the support.

[0019] 5. This utility model can support the inner walls of both sides of the arched support frame through the lateral support mechanism. By controlling the rotation of the third bidirectional screw, the two moving blocks are brought closer or further apart. Under the action of the mounting rod, the lateral top plate is stably supported on the inner wall of the arched support frame, thus achieving the purpose of stable support.

[0020] 6. This utility model enables the movement of the U-shaped support frame through the universal wheels at the bottom of the lifting seat, facilitating quick support of the tunnel inner wall during use. The height of the lifting seat can be adjusted through the cooperation of the threaded rod and the turntable. When fixed, the fixing rod is located below the lifting seat, so that the fixing rod is fixed in the ground, increasing the stability of the device support. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the top support mechanism of this utility model;

[0023] Figure 3 This is an enlarged structural diagram of point E in this utility model;

[0024] Figure 4 This is a sectional view of the U-shaped support frame of this utility model from below, and a structural schematic diagram.

[0025] Figure 5 This is an enlarged structural schematic diagram of point A of this utility model;

[0026] Figure 6 This is an enlarged structural schematic diagram of point C of this utility model;

[0027] Figure 7 This is an enlarged structural schematic diagram of point D of this utility model;

[0028] Figure 8 This is an enlarged structural diagram of section B of the present invention.

[0029] In the diagram: 1. Arched support frame; 2. Buffer mechanism; 3. U-shaped support frame; 4. Top support mechanism; 5. Lateral support mechanism; 6. Mounting groove; 7. Arc-shaped plate; 8. Buffer spring; 9. Anchor bolt; 10. Fixing plate; 11. First bidirectional screw; 12. First motor; 13. Slider; 14. Support plate; 15. Arc-shaped top plate; 16. Fixing seat; 17. Adjusting rod; 18. Support spring; 19. Vertical plate; 20. Positioning rod; 21. Strip groove; 22. Mounting plate; 23. Support cylinder 24. Support rod; 25. Adjusting bolt; 26. Second double-acting screw; 27. Sliding block; 28. Second motor; 29. ​​Pulley; 30. Adjusting plate; 31. Lifting block; 32. Lifting plate; 33. U-shaped seat; 34. Connecting plate; 35. Third double-acting screw; 36. Moving block; 37. Mounting rod; 38. Side top plate; 39. Worm gear; 40. Worm; 41. Third motor; 42. Fixed base plate; 43. Fixed rod; 44. Lifting seat; 45. Threaded rod; 46. Turntable. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figure 1-8 This utility model provides a technical solution: a protective structure for temporary support during blasting construction of a tunnel, including an arched support frame 1, buffer mechanisms 2 are equidistantly arranged on the outer side of the arched support frame 1, a U-shaped support frame 3 is arranged inside the arched support frame 1, and a top support mechanism 4 is installed on the top of the U-shaped support frame 3, and the top support mechanism 4 is in contact with the inner wall of the arched support frame 1.

[0032] It should be noted that the top support mechanism 4 can provide stable support for the top of the inner wall of the arched support frame 1.

[0033] The U-shaped support frame 3 is provided with lateral support mechanisms 5 on both sides of its corresponding side walls. The U-shaped support frame 3 is provided with lifting grooves on both sides of its corresponding side walls, and lifting plates 32 are slidably connected in the lifting grooves. The two lateral support mechanisms 5 are respectively installed on the surfaces of the two lifting plates 32.

[0034] It should be noted that the U-shaped support frame 3 has lifting slots on both sides for the lifting plate 32 to move up and down. The lateral support mechanism 5 is fixedly installed on the lifting plate 32. By setting the corresponding driving components to drive the lifting plate 32 to move up and down, the height position of the lateral support mechanism 5 can be controlled, so as to adapt to the support of the inner wall of the arch support frame 1 of different heights and expand the scope of use.

[0035] The buffer mechanism 2 includes an arc plate 7, a buffer spring 8, and an anchor rod 9. Anchor rods 9 are installed at equal intervals on the outside of the mounting groove 6, and the ends of the anchor rods 9 pass through the mounting groove 6. The arc plate 7 is slidably connected to the outside of the anchor rod 9. A buffer spring 8 is sleeved on the outside of the anchor rod 9 between the mounting groove 6 and the arc plate 7, and the two ends of the buffer spring 8 are fixedly connected to the mounting groove 6 and the arc plate 7, respectively.

[0036] It should be noted that when using this utility model, the arched support frame 1 is first installed on the inner wall of the tunnel. In the initial state of the arched support frame 1, the anchor rod 9 is disconnected from the arched support frame 1. After the arched support frame 1 is installed on the inner wall of the tunnel, the buffer spring 8 is in a certain compressed state. Concrete is sprayed onto the tunnel wall, and the anchor rod 9 is installed inside the arched support frame 1. The end of the anchor rod 9 is embedded in the concrete, thereby increasing the stability of the rock mass and reducing rockfall. Then, the U-shaped support frame 3 is pushed into the arched support frame 1, and then the turntable 46 is rotated. This causes the lifting seat 44 to move upward, positioning the fixed base plate 42 outside the lifting seat 44. Then, the fixing rod 43 at the bottom of the fixed base plate 42 is fixed to the ground, increasing the overall stability of the U-shaped support frame 3. The control system controls the first motor 12 to rotate the first bidirectional screw 11. Through the threaded connection between the two sliders 13 and the first bidirectional screw 11, the two sliders 13 are brought closer together. Under the action of the support plate 14, the arc-shaped top plate 15 is pressed tightly against the top of the inner wall of the arched support frame 1, achieving support. During blasting operations... The buffer spring 8 can absorb the vibration pressure from the tunnel wall, thus protecting the arch support frame 1. The support spring 18 can buffer the inside of the arch support frame 1, thereby protecting the arch support frame 1 and providing protective support for the tunnel. The height of the lateral support mechanism 5 is adjusted according to the support positions at both ends of the inner wall of the arch support frame 1. During adjustment, it is only necessary to control the second motor 28 to rotate the second bidirectional screw 26. The sliding blocks 27 at both ends of the second bidirectional screw 26 are threadedly connected to it, so that the two sliding blocks 27 move closer or further apart. The lifting plate 32 is raised and lowered, and the height of the lateral support mechanism 5 is adjusted. After the height of the lateral support mechanism 5 is adjusted, the third motor 41 is controlled to rotate the worm gear 40. The third bidirectional screw 35 is rotated through the meshing connection between the worm gear 40 and the two worm wheels 39. The two moving blocks 36 are connected to the two ends of the third bidirectional screw 35 by threads, so that the two moving blocks 36 move closer or further away from each other. Under the action of the mounting rod 37, the lateral top plate 38 is firmly supported on the inner wall of the arched support frame 1, which plays a role in stabilizing the two sides.

[0037] The top support mechanism 4 includes a fixed plate 10, a first bidirectional screw 11, a first motor 12, a slider 13, a support plate 14, and an arc-shaped top plate 15. The top two ends of the U-shaped support frame 3 are fixedly connected to fixed plates 10, and the first bidirectional screw 11 is rotatably connected between the two fixed plates 10. The two ends of the first bidirectional screw 11 are symmetrically threaded to sliders 13, and the bottom of the sliders 13 is slidably connected to the top of the U-shaped support frame 3. The first motor 12 is fixedly installed at one end of the top of the U-shaped support frame 3, and the output shaft end of the first motor 12 passes through the fixed plate 10 and is fixed to the first bidirectional screw 11. The top ends of the two first bidirectional screws 11 are rotatably connected to support plates 14, and the ends of the two support plates 14 are connected to arc-shaped top plates 15. The arc-shaped top plate 15 is supported on the inner wall of the arched support frame 1, and mounting blocks are symmetrically arranged at the bottom of the arc-shaped top plate 15. The ends of the two support plates 14 are rotatably connected to the two mounting blocks respectively.

[0038] It should be noted that the control system of the device controls the first motor 12 to rotate the first bidirectional screw 11. Through the threaded connection between the two sliders 13 and the first bidirectional screw 11, the two sliders 13 are brought closer together. Under the action of the support plate 14, the arc-shaped top plate 15 is pressed against the top of the inner wall of the arched support frame 1, providing tight support to the top of the inner wall of the arched support frame 1.

[0039] A fixed base 16 is fixedly connected to the top center of the U-shaped support frame 3. The first bidirectional screw 11 passes through the fixed base 16. Support blocks are symmetrically arranged at both ends of the top of the fixed base 16, and an adjusting rod 17 is rotatably connected to the top of the support blocks. A support spring 18 is fixedly connected between the top of the fixed base 16 and the adjusting rod 17. A vertical plate 19 is fixedly connected to both ends of the top of the fixed base 16 between the two adjusting rods 17. A positioning rod 20 is fixedly connected to the top of the vertical plate 19. A strip groove 21 is opened on the surface of the adjusting rod 17. The positioning rod 20 is slidably connected in the strip groove 21. An installation plate 22 is slidably connected between the four adjusting rods 17. A support cylinder 23 is fixedly connected to the top of the installation plate 22, and a support rod 24 is slidably arranged in the support cylinder 23. An arc-shaped top plate 15 is fixedly connected to the top of the support rod 24. An adjusting bolt 25 is provided at the top of the support cylinder 23. The support rod 24 and the support cylinder 23 are fixedly connected by the adjusting bolt 25.

[0040] It should be noted that when tunnel blasting is carried out, the vibration causes the inner wall of the tunnel to exert a certain impact on the arch support frame 1. The buffer spring 8 then provides a buffering effect. When the support cylinder 23 and support rod 24 are subjected to a certain impact, the mounting plate 22 presses down on the four adjusting rods 17, the mounting plate 22 slides down, and the support spring 18 provides stable support and a certain buffering effect, ensuring the stability of the support.

[0041] A connecting plate 34 is fixedly connected to the top of the two lifting plates 32. The lateral support mechanism 5 includes a U-shaped seat 33, a third bidirectional screw 35, a moving block 36, a mounting rod 37, a lateral top plate 38, a worm gear 39, a worm 40, and a third motor 41. The third bidirectional screw 35 is rotatably connected inside the U-shaped seat 33. The two ends of the third bidirectional screw 35 are symmetrically threaded with moving blocks 36. The moving blocks 36 are slidably connected inside the U-shaped seat 33. The end of the moving block 36 is rotatably connected with a mounting rod 37. The end of the mounting rod 37 is connected to a side top plate 38. Connecting blocks are symmetrically arranged inside the side top plate 38. The two mounting rods 37 are rotatably connected to the two connecting blocks respectively. The end of the third bidirectional screw 35 passes through the U-shaped seat 33 and is fixedly connected to the worm gear 39. The worm 40 is rotatably arranged inside the connecting plate 34. The two ends of the worm 40 pass through the two lifting plates 32 respectively and are engaged with the two worm gears 39. The side wall of the lifting plate 32 is fixedly installed with a third motor 41, and the end of the output shaft of the third motor 41 is fixedly connected to the worm 40.

[0042] It should be noted that by controlling the operation of the third motor 41, the worm 40 is rotated. The third bidirectional screw 35 is rotated by the meshing connection between the worm 40 and the two worm wheels 39. The two moving blocks 36 are connected to the two ends of the third bidirectional screw 35 by threads, so that the two moving blocks 36 move closer or further away from each other. Under the action of the mounting rod 37, the side top plate 38 is firmly supported on the inner wall of the arched support frame 1, which plays a role in providing stable support on both sides.

[0043] The top of the U-shaped support frame 3 is symmetrically rotatably connected to a second bidirectional screw 26. The ends of the two second bidirectional screws 26 pass through the U-shaped support frame 3 and are fixedly connected to pulleys 29. The two pulleys 29 are connected by belt drive. The top of the U-shaped support frame 3 is fixedly installed with a second motor 28. The output shaft end of the second motor 28 passes through the U-shaped support frame 3 and is fixedly connected to the second bidirectional screw 26. The two ends of the second bidirectional screw 26 are symmetrically threaded with sliding blocks 27. The top of the sliding block 27 is slidably connected to the inner wall of the U-shaped support frame 3. The bottom end of the sliding block 27 is rotatably connected to an adjusting plate 30. The lifting plate 32 is located on one side inside the U-shaped support frame 3 and symmetrically fixed with lifting blocks 31. The end of the adjusting plate 30 is rotatably connected to the lifting block 31.

[0044] It should be noted that the height of the lateral support mechanism 5 can be adjusted according to the support positions at both ends of the inner wall of the arched support frame 1. During adjustment, it is only necessary to control the second motor 28 to rotate the second bidirectional screw 26. The two sliding blocks 27 at both ends of the second bidirectional screw 26 are connected to it by threads, so that the two sliding blocks 27 move closer or further away from each other, thereby realizing the lifting of the lifting plate 32 and realizing the height adjustment of the lateral support mechanism 5.

[0045] Both the outer sides of the arc-shaped top plate 15 and the lateral top plate 38 are fixedly connected with buffer pads.

[0046] It should be noted that the buffer pads on the arc-shaped top plate 15 and the side top plate 38 have a good shock absorption and buffering effect, which helps to protect the arch support frame 1.

[0047] The bottom ends of the U-shaped support frame 3 are fixedly connected to a fixed base plate 42, and the bottom four corners of the fixed base plate 42 are fixedly connected to a fixed rod 43.

[0048] It should be noted that when the U-shaped support frame 3 is in use, the fixing rod 43 on its bottom fixed plate 42 is fixed to the ground, which enhances the overall stability.

[0049] The bottom end of the U-shaped support frame 3 is connected to the lifting seat 44. The top of the lifting seat 44 is provided with a limiting groove. The U-shaped support frame 3 is slidably connected in the limiting groove. The fixed base plate 42 and the fixed rod 43 are located inside the lifting seat 44. Universal wheels are installed at the four corners of the bottom of the lifting seat 44.

[0050] It should be noted that the movement of the U-shaped support frame 3 can be controlled by the casters.

[0051] The top of the fixed base plate 42 is symmetrically rotatably connected with threaded rods 45, and the top of the threaded rods 45 is fixedly connected with a turntable 46. The bottom of the lifting seat 44 is provided with a connecting opening, and the width of the connecting opening is greater than the distance between the two fixed rods 43.

[0052] It should be noted that the U-shaped support frame 3 can be pushed into the tunnel arch support frame 1 by using the casters. Then, the turntable 46 is rotated to move the lifting seat 44 upward, so that the fixed base plate 42 is located outside the lifting seat 44. Then, the fixing rod 43 at the bottom of the fixed base plate 42 is fixed to the ground, which increases the overall stability of the U-shaped support frame 3.

[0053] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0054] Furthermore, the terms “first,” “second,” “third,” and “fourth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as “first,” “second,” “third,” or “fourth” may explicitly or implicitly include at least one of those features.

[0055] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protective structure for temporary support during blasting construction of a mined tunnel, comprising an arched support frame (1), characterized in that: The arched support frame (1) is provided with buffer mechanisms (2) at equal intervals on its outer side. A U-shaped support frame (3) is provided inside the arched support frame (1). A top support mechanism (4) is installed on the top of the U-shaped support frame (3), and the top support mechanism (4) is in contact with the inner wall of the arched support frame (1). Lateral support mechanisms (5) are provided on the corresponding side walls of the U-shaped support frame (3). Lifting grooves are opened on the corresponding side walls of the U-shaped support frame (3), and lifting plates (32) are slidably connected in the lifting grooves. The two lateral support mechanisms (5) The buffer mechanism (2) is installed on the surfaces of two lifting plates (32) respectively. It includes a mounting groove (6), an arc plate (7), a buffer spring (8) and an anchor rod (9). Anchor rods (9) are installed at equal intervals on the outside of the mounting groove (6), and the ends of the anchor rods (9) pass through the mounting groove (6). The arc plate (7) is slidably connected to the outside of the anchor rods (9). A buffer spring (8) is sleeved between the mounting groove (6) and the arc plate (7) on the outside of the anchor rods (9), and the two ends of the buffer spring (8) are fixedly connected to the mounting groove (6) and the arc plate (7) respectively.

2. The protective structure for temporary support in blasting construction of a mined tunnel according to claim 1, characterized in that: The top support mechanism (4) includes a fixed plate (10), a first bidirectional screw (11), a first motor (12), a slider (13), a support plate (14), and an arc-shaped top plate (15). The top two ends of the U-shaped support frame (3) are fixedly connected to fixed plates (10), and the two fixed plates (10) are rotatably connected to the first bidirectional screw (11). The two ends of the first bidirectional screw (11) are symmetrically threaded to sliders (13), and the bottom of the sliders (13) is slidably connected to the top of the U-shaped support frame (3). The U-shaped support frame (3) A first motor (12) is fixedly installed at one end of the top of the frame, and the output shaft end of the first motor (12) passes through the fixing plate (10) and is fixed to the first bidirectional screw (11). The top ends of the two first bidirectional screws (11) are rotatably connected to support plates (14), and the ends of the two support plates (14) are connected to arc-shaped top plates (15). The arc-shaped top plates (15) are supported on the inner wall of the arch support frame (1), and mounting blocks are symmetrically arranged at the bottom of the arc-shaped top plates (15). The ends of the two support plates (14) are rotatably connected to the two mounting blocks respectively.

3. The protective structure for temporary support in blasting construction of a mined tunnel according to claim 2, characterized in that: A fixed seat (16) is fixedly connected to the top center of the U-shaped support frame (3). The first bidirectional screw (11) passes through the fixed seat (16). Support blocks are symmetrically arranged at both ends of the top of the fixed seat (16), and an adjusting rod (17) is rotatably connected to the top of the support blocks. A support spring (18) is fixedly connected between the top of the fixed seat (16) and the adjusting rod (17). A vertical plate (19) is fixedly connected to both ends of the top of the fixed seat (16) between the two adjusting rods (17). A positioning rod (20) is fixedly connected to the top of the vertical plate (19). The adjusting rod (18) is fixedly connected to the top of the vertical plate (19). 17) has a strip groove (21) on its surface. The positioning rod (20) is slidably connected in the strip groove (21). The four adjusting rods (17) are slidably connected to an mounting plate (22). The top of the mounting plate (22) is fixedly connected to a support cylinder (23). A support rod (24) is slidably arranged in the support cylinder (23). The top of the support rod (24) is fixedly connected to an arc-shaped top plate (15). An adjusting bolt (25) is provided at the top of the support cylinder (23). The support rod (24) and the support cylinder (23) are fixedly connected by the adjusting bolt (25).

4. The protective structure for temporary support in blasting construction of a mined tunnel according to claim 2, characterized in that: A connecting plate (34) is fixedly connected to the top of the two lifting plates (32). The lateral support mechanism (5) includes a U-shaped seat (33), a third bidirectional screw (35), a moving block (36), a mounting rod (37), a lateral top plate (38), a worm gear (39), a worm (40), and a third motor (41). The third bidirectional screw (35) is rotatably connected inside the U-shaped seat (33). The two ends of the third bidirectional screw (35) are symmetrically threaded with moving blocks (36). The moving blocks (36) are slidably connected inside the U-shaped seat (33). The ends of the moving blocks (36) are rotatably connected with mounting rods (37). The end of each mounting rod (37) is connected to a side top plate (38). A connecting block is symmetrically arranged inside the side top plate (38). The two mounting rods (37) are rotatably connected to the two connecting blocks respectively. The end of the third bidirectional screw (35) passes through the U-shaped seat (33) and is fixedly connected to a worm gear (39). A worm (40) is rotatably arranged inside the connecting plate (34). The two ends of the worm (40) pass through the two lifting plates (32) respectively and are meshed with the two worm gears (39). A third motor (41) is fixedly installed on the side wall of the lifting plate (32), and the end of the output shaft of the third motor (41) is fixedly connected to the worm (40).

5. A protective structure for temporary support in blasting construction of a mined tunnel according to claim 4, characterized in that: The top of the U-shaped support frame (3) is symmetrically rotatably connected to a second bidirectional screw (26). The ends of the two second bidirectional screws (26) pass through the U-shaped support frame (3) and are fixedly connected to pulleys (29). The two pulleys (29) are connected by belt drive. The top of the U-shaped support frame (3) is fixedly installed with a second motor (28). The output shaft end of the second motor (28) passes through the U-shaped support frame (3) and is fixedly connected to the second bidirectional screw (26). The two ends of the second bidirectional screw (26) are symmetrically threaded with sliding blocks (27). The top of the sliding block (27) is slidably connected to the inner wall of the U-shaped support frame (3). The bottom end of the sliding block (27) is rotatably connected to an adjusting plate (30). The lifting plate (32) is located on one side of the U-shaped support frame (3) and is symmetrically fixed with a lifting block (31). The end of the adjusting plate (30) is rotatably connected to the lifting block (31).

6. The protective structure for temporary support in blasting construction of a mined tunnel according to claim 4, characterized in that: Both the outer sides of the arc-shaped top plate (15) and the side top plate (38) are fixedly connected with buffer pads.

7. The protective structure for temporary support in blasting construction of a mined tunnel according to claim 1, characterized in that: The bottom ends of the U-shaped support frame (3) are fixedly connected to a fixed base plate (42), and the bottom four corners of the fixed base plate (42) are fixedly connected to a fixed rod (43).

8. A protective structure for temporary support in blasting construction of a mined tunnel according to claim 7, characterized in that: The bottom end of the U-shaped support frame (3) is connected to a lifting seat (44). The top of the lifting seat (44) is provided with a limiting groove. The U-shaped support frame (3) is slidably connected in the limiting groove. The fixed base plate (42) and the fixed rod (43) are located inside the lifting seat (44). The four corners of the bottom of the lifting seat (44) are all equipped with casters.

9. A protective structure for temporary support in blasting construction of a mined tunnel according to claim 8, characterized in that: The top of the fixed base plate (42) is symmetrically rotatably connected with a threaded rod (45), and the top of the threaded rod (45) is fixedly connected with a turntable (46). The bottom of the lifting seat (44) is provided with a connecting port, and the width of the connecting port is greater than the distance between the two fixed rods (43).

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