A tunnel support dismantling device and method

Abstract

The application discloses a tunnel supporting dismantling device and method, which comprises a rotating platform and a wind pick located at the top of the rotating platform, the bottom of the rotating platform is provided with a splicing mechanism capable of being spliced with the carriage guardrail of an aerial work platform vehicle, and a rotation limiting mechanism for limiting the rotation of the rotating platform is arranged between the rotating platform and the splicing mechanism. In the application, the wind pick is arranged on the guide mechanism, and then the splicing mechanism is spliced with the carriage guardrail of the aerial work platform vehicle, so that most of the force of the wind pick during work is borne by the carriage, and the operator can have more power to control the crushing degree of the wind pick on the concrete, thereby improving the dismantling precision. Through the rotation limiting mechanism, the operator can quickly adjust the wind pick to be perpendicular to the temporary support in the construction state, and the sliding limiting mechanism is used to limit the maximum distance that the wind pick can move towards the temporary support, so that the wind pick cannot excessively damage the inner wall of the tunnel, and the dismantling precision is further improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and in particular to a tunnel support dismantling device and method. Background Technology

[0002] Temporary support for large-section tunnels is a crucial aspect of tunnel construction, especially in the building of large-section tunnels. This support method is typically used to maintain the stability of the tunnel structure, prevent collapse, and ensure construction safety. However, towards the end of tunnel construction, the temporary supports need to be removed to facilitate subsequent procedures.

[0003] Currently, the demolition of tunnel supports requires the use of crushing equipment to remove concrete. Due to the large size and difficulty in controlling the large crusher drill bit, manual hand-held pneumatic picks are commonly used to remove concrete at the connection joints. However, when demolishing the top connection joints, relying solely on manual control of the demolition angle and depth results in relatively low demolition accuracy and can easily damage the inner wall of the tunnel. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings by providing a tunnel support dismantling device and method to improve dismantling accuracy.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a tunnel support demolition device, comprising a rotating platform and a pneumatic pick located on top of the rotating platform, wherein the bottom of the rotating platform is provided with a splicing mechanism that can be spliced ​​with the guardrail of the aerial work platform, a rotation limiting mechanism for limiting the rotation of the rotating platform is provided between the rotating platform and the splicing mechanism, and a guide mechanism connected to the pneumatic pick and guiding the pneumatic pick to move towards and away from the temporary support is provided on the top of the rotating platform, wherein a sliding limiting mechanism is provided on the guide mechanism for limiting the maximum distance that the pneumatic pick can move towards the temporary support.

[0006] Furthermore, the splicing mechanism includes a splicing seat rotatably disposed at the bottom of the rotating platform. The bottom of the splicing seat is provided with at least two sets of clamping components that can clamp onto the carriage guardrail and two strip-shaped rollers that can roll on the top of the carriage guardrail. The clamping components include a fixed strip fixedly disposed at the bottom of the splicing seat and a movable strip slidably disposed at the bottom of the splicing seat. The splicing seat is threaded with a first adjusting screw for driving the movable strip to move closer to and away from the fixed strip.

[0007] Furthermore, the rotation limiting mechanism includes a central shaft fixedly installed at the bottom of the rotating platform and passing through the splicing seat. A gear is fixedly installed at the bottom end of the central shaft. The rotation limiting mechanism also includes a vertical plate fixedly installed on the splicing seat. A limiting toothed plate that meshes with the gear is provided between the vertical plate and the gear. A pull rod for driving the limiting toothed plate closer to and away from the gear is slidably installed on the vertical plate. A first compression spring sleeved on the pull rod is provided between the limiting toothed plate and the vertical plate. When the first compression spring is in its natural state, the gear meshes with the limiting toothed plate.

[0008] Furthermore, the guiding mechanism includes two side plates disposed on the top of the rotating platform, and guide rails are rotatably disposed on opposite sides of the two side plates. Guide grooves are provided on the guide rails to guide the pneumatic pick to move toward and away from the temporary support. The pneumatic pick is slidably disposed between the two guide rails.

[0009] Furthermore, the sliding limiting mechanism includes a sliding plate and a threaded seat mounted on one of the guide rails. The threaded seat is threaded with a second adjusting screw for moving the sliding plate toward and away from the temporary support. The end of the sliding plate away from the guide rail is provided with an outer sleeve. The end of the outer sleeve near the temporary support has a telescopic groove. A second compression spring is provided in the telescopic groove. A top rod is slidably mounted on the end of the outer sleeve near the temporary support and inserted into the telescopic groove. A stop bar is mounted on the top rod and moves with the top rod, with one end inserted into the guide groove. A top plate is mounted on the end of the top rod outside the outer sleeve. The top rod and the working end of the pneumatic pick are in the same horizontal plane. When the stop bar contacts the temporary support, the distance the pneumatic pick moves to contact the stop bar is greater than the distance between the pneumatic pick and the temporary support.

[0010] Furthermore, a protective plate is detachably mounted on the side plate and fitted onto the pneumatic pick. The protective plate consists of an inverted U-shaped plate and inclined plates at both ends of the U-shaped plate, with the inclined plates tilted toward the side away from the carriage railing.

[0011] A method for dismantling tunnel support, comprising any one of the tunnel support dismantling devices described in any one of the claims, wherein the method is as follows:

[0012] First, by rotating the first adjusting screw, the movable strip is moved away from the fixed strip. Then, the splicing mechanism is moved above the guardrail of the carriage, aligned with the guardrail, and moved downwards, keeping the guardrail between the movable and fixed strips until the strip roller contacts the guardrail. Then, the first adjusting screw is rotated in the opposite direction to move the movable strip closer to the fixed strip until the movable strip can no longer move. Then, the first adjusting screw is rotated back a quarter turn so that the distance between the movable and fixed strips is slightly greater than the thickness of the guardrail, allowing the jackhammer to move horizontally on the guardrail through the splicing mechanism.

[0013] Next, control the aerial work platform to raise the carriage, so that the side of the carriage equipped with the jackhammer is as close as possible to the connection node of the top of the temporary support to be demolished. At the same time, make the sliding limit mechanism side in the direction of the temporary support demolition. Since the carriages move at different angles, when it is observed that the jackhammer is not perpendicular to the temporary support surface, first adjust the carriage so that the top plate contacts the temporary support. Then pull the lever away from the gear to disengage the limit tooth plate from the gear. Then rotate the jackhammer and observe the contact state between the top plate and the temporary support. When the top plate is in complete contact with the temporary support, loosen the lever to complete the adjustment of the working angle of the jackhammer.

[0014] Finally, by pushing the pneumatic pick towards one side of the temporary support, the operator can break the concrete at the top connection node of the temporary support. The depth of the breakage is limited by the stop bar, improving the demolition accuracy. After breaking at this point, the pneumatic pick is retracted and the angle is swung to demolish the vertical area near the temporary support. After all the above operations are completed, the pneumatic pick can be moved on the railing of the carriage guardrail to continue demolishing the subsequent area. After the concrete at the connection node of the temporary support is broken, the bolts at the connection can be cut to disconnect it from the initial support grid. Finally, the remaining concrete of the temporary support is broken to complete the demolition of this section of the temporary support.

[0015] The beneficial effects of this invention are reflected in:

[0016] This invention mounts a pneumatic pick on a guide mechanism and then connects it to the guardrail of an aerial work platform using a splicing mechanism. This allows the vehicle to bear most of the force during the pneumatic pick's operation, giving operators more control over the degree of concrete breaking and improving demolition accuracy. Furthermore, a rotational limiting mechanism allows operators to quickly adjust the pneumatic pick to a position perpendicular to the temporary support, while a sliding limiting mechanism restricts the maximum distance the pneumatic pick can move towards the temporary support, ensuring that the pneumatic pick does not excessively damage the tunnel wall and further improving demolition accuracy. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 for Figure 1 A magnified view of a portion of point A shown;

[0019] Figure 3 This is a structural view of the rotary limiting mechanism of the present invention;

[0020] Figure 4 This is a partial cross-sectional view of the sliding limiting mechanism of the present invention;

[0021] Figure 5This is a perspective view of the invention installed on the carriage;

[0022] Figure 6 This is a schematic diagram illustrating the operation of the present invention.

[0023] In the picture:

[0024] 1. Rotating platform; 2. Splicing mechanism; 21. Splicing seat; 22. Strip roller; 23. Fixed strip; 24. Movable strip; 25. First adjusting screw; 3. Rotation limiting mechanism; 31. Central shaft; 32. Gear; 33. Vertical plate; 34. Limiting toothed plate; 35. Tie rod; 36. First compression spring; 4. Pneumatic pick; 5. Guide mechanism; 51. Side plate; 52. Guide rail; 6. Sliding limiting mechanism; 61. Slide plate; 62. Threaded seat; 63. Second adjusting screw; 64. Outer sleeve; 65. Second compression spring; 66. Top rod; 67. Stop bar; 68. Top plate; 7. Protective plate; 8. Temporary support; 9. Carriage. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1-6 This invention discloses a tunnel support demolition device, including a rotating platform 1 and a pneumatic pick 4 located on top of the rotating platform 1. The bottom of the rotating platform 1 is provided with a splicing mechanism 2 that can be spliced ​​with the guardrail of the carriage 9 of an aerial work platform. A rotation limiting mechanism 3 for limiting the rotation of the rotating platform 1 is provided between the rotating platform 1 and the splicing mechanism 2. A guide mechanism 5 is provided on the top of the rotating platform 1, which is connected to the pneumatic pick 4 and guides the pneumatic pick 4 to move towards and away from the temporary support 8. A sliding limiting mechanism 6 is provided on the guide mechanism 5 for limiting the maximum distance that the pneumatic pick 4 can move towards the temporary support 8.

[0027] This invention, by mounting the pneumatic pick 4 on the guide mechanism 5 and then splicing it with the guardrail of the aerial work platform using the splicing mechanism 2, allows most of the force of the pneumatic pick 4 during operation to be borne by the vehicle body. This gives the operator more control over the degree of concrete breaking caused by the pneumatic pick 4, improving demolition accuracy. Furthermore, by setting a rotation limit mechanism 3, the operator can quickly adjust the pneumatic pick 4 to a construction state perpendicular to the temporary support. At the same time, the sliding limit mechanism 6 restricts the maximum distance that the pneumatic pick 4 can move towards the temporary support, thereby ensuring that the pneumatic pick does not excessively damage the tunnel wall and further improving demolition accuracy.

[0028] In one embodiment, the splicing mechanism 2 includes a splicing seat 21 rotatably disposed at the bottom of the rotating platform 1. The bottom of the splicing seat 21 is provided with at least two sets of clamping components that can be clamped onto the guardrail of the carriage and two strip-shaped rollers 22 that can roll on the top of the guardrail. The clamping components include a fixed strip 23 fixedly disposed at the bottom of the splicing seat 21 and a movable strip 24 slidably disposed at the bottom of the splicing seat 21. The splicing seat 21 is threaded with a first adjusting screw 25 for driving the movable strip 24 to move closer to and away from the fixed strip 23.

[0029] This design allows the spacing between the movable strip 24 and the fixed strip 23 to be changed by rotating and adjusting the first adjusting screw 25, enabling the splicing mechanism 2 to be installed on various thicknesses of carriage railings, thus improving the applicability of this device.

[0030] It should be noted that the strip roller 22 is not located within the moving area of ​​the movable strip 24, so that the movement of the movable strip 24 is not restricted by the strip roller 22.

[0031] In specific implementation, in order to restrict the movement of the jackhammer 4 in the non-working state, a clamp attracted by an electromagnet can be set in the fixing bar 23, and a compression spring that pushes the clamp to hold the guardrail can be set in the fixing bar 23. When the electromagnet is not working, the compression spring pushes the clamp to hold the guardrail, increasing the movement resistance of the splicing mechanism 2 on the guardrail. By setting a normally open switch to control the operation of the electromagnet at the grip of the jackhammer 4, the jackhammer 4 can be slid normally using the splicing mechanism 2 when the operator uses the jackhammer 4.

[0032] In one embodiment, the rotation limiting mechanism 3 includes a central shaft 31 fixedly disposed at the bottom of the rotating platform 1 and passing through the splicing base 21. A gear 32 is fixedly disposed at the bottom end of the central shaft 31. The rotation limiting mechanism 3 also includes a vertical plate 33 fixedly disposed on the splicing base 21. A limiting toothed plate 34 that meshes with the gear 32 is disposed between the vertical plate 33 and the gear 32. A pull rod 35 for driving the limiting toothed plate 34 to move closer to and away from the gear 32 is slidably disposed on the vertical plate 33. A first compression spring 36 sleeved on the pull rod 35 is disposed between the limiting toothed plate 34 and the vertical plate 33. When the first compression spring 36 is in its natural state, the gear 32 meshes with the limiting toothed plate 34.

[0033] This design restricts the rotation of the rotating platform 1 to the limit tooth plate 34. Only when the limit tooth plate 34 is away from the gear 32 can the operator rotate the rotating platform 1 to adjust the angle of the pneumatic pick 4. Under normal conditions, the angle of the pneumatic pick 4 can remain unchanged, thus improving the demolition accuracy.

[0034] In one embodiment, the guide mechanism 5 includes two side plates 51 disposed on the top of the rotating platform 1. Each of the two side plates 51 is rotatably provided with a guide rail 52 on its opposite side. The guide rail 52 is provided with a guide groove to guide the pneumatic pick 4 to move toward and away from the temporary support. The pneumatic pick 4 is slidably disposed between the two guide rails 52.

[0035] This design allows the pneumatic hammer 4 to not only move back and forth to complete the demolition work, but also to swing up and down to adjust the demolition angle, thus adapting to various demolition needs.

[0036] It should be noted that a limiting strip is provided inside the guide groove to prevent the pneumatic pick 4 from completely disengaging from the guide groove.

[0037] In practice, the pneumatic pick 4 is connected to the guide rail 52 via a clamp, which allows for quick replacement of the pneumatic pick 4 in case of failure.

[0038] In one embodiment, the sliding limiting mechanism 6 includes a sliding plate 61 and a threaded seat 62 disposed on one of the guide rails 52. The threaded seat 62 is threaded with a second adjusting screw 63 for moving the sliding plate 61 toward and away from the temporary support. The end of the sliding plate 61 away from the guide rail 52 is provided with an outer sleeve 64. The end of the outer sleeve 64 near the temporary support is provided with a telescopic groove. A second compression spring 65 is disposed in the telescopic groove. A top rod 66 is slidably disposed at the end of the outer sleeve 64 near the temporary support and inserted into the telescopic groove. A stop bar 67 is disposed on the top rod 66 and moves with the top rod 66 and is inserted into the guide groove at one end. A top plate 68 is disposed at the end of the top rod 66 outside the outer sleeve 64. The top rod 66 and the working end of the pneumatic hammer 4 are in the same horizontal plane. When the stop bar 67 contacts the temporary support, the distance from which the pneumatic hammer 4 contacts the stop bar 67 is greater than the distance between the pneumatic hammer 4 and the temporary support.

[0039] This design utilizes the top plate 68 to first contact the temporary support to be demolished. As the relative distance between the top plate 66 and the temporary support 8 changes with each adjustment of the carriage 9, the length of the top rod 66 within the outer sleeve 64 also changes accordingly, thereby driving the baffle 67 to move within the guide groove. Since the baffle 67 is located in the direction of movement of the pneumatic hammer 4, the breaking depth of the pneumatic hammer 4 is limited by the baffle 67, which enables the pneumatic hammer 4 to maintain a consistent breaking depth at different positions, improving demolition accuracy. By adjusting the second adjusting screw 63 and changing the position of the outer sleeve 64, the breaking depth of the pneumatic hammer 4 can be adjusted to meet different construction needs.

[0040] In practice, multiple ball bearings are provided on the side of the roof 68 that contacts the temporary support to improve the smoothness of the roof 68's movement on the temporary support.

[0041] In one embodiment, a protective plate 7 is detachably provided on the side plate 51 and sleeved on the jackhammer 4. The protective plate 7 consists of an inverted U-shaped plate and inclined plates provided at both ends of the U-shaped plate. The inclined plates are inclined to the side away from the guardrail of the carriage.

[0042] This design utilizes the protective plate 7 to intercept concrete fragments that fall to the operator's side after being broken by the pneumatic hammer 4, and guides them to the side away from the operator via the inclined plate, thereby improving the operator's construction safety.

[0043] In practice, to facilitate operators' observation of the construction process, the protective plate 7 can be made of transparent material. At the same time, a dust collector can be installed on the protective plate 7 to purify the dust generated during crushing, improve visibility, and reduce the harm of dust to the operators.

[0044] A method for dismantling tunnel support, comprising any one of the tunnel support dismantling devices, wherein the method is as follows:

[0045] First, by rotating the first adjusting screw 25, the movable strip 24 is moved away from the fixed strip 23. Then, the splicing mechanism 2 is moved above the guardrail of the carriage, aligned with the guardrail, and moved downwards, keeping the guardrail between the movable strip 24 and the fixed strip 23, until the strip roller 22 contacts the guardrail. Then, the first adjusting screw 25 is rotated in the opposite direction to move the movable strip 24 closer to the fixed strip 23, until the movable strip 24 can no longer move. Then, the first adjusting screw 25 is rotated back a quarter turn, so that the distance between the movable strip 24 and the fixed strip 23 is slightly greater than the thickness of the guardrail, so that the jackhammer 4 can move horizontally on the guardrail of the carriage through the splicing mechanism 2.

[0046] Next, control the aerial work platform to raise the carriage, so that the side of the carriage with the jackhammer 4 is as close as possible to the connection node of the top of the temporary support to be demolished. At the same time, make the sliding limit mechanism 6 one side in the direction of the temporary support demolition. Since the carriages move at different angles, when it is observed that the jackhammer 4 is not perpendicular to the temporary support surface, first adjust the carriage so that the top plate 68 contacts the temporary support. Then pull the tie rod 35 away from the gear 32 to disengage the limit tooth plate 34 from the gear 32. Then rotate the jackhammer 4 and observe the contact state between the top plate 68 and the temporary support. When the top plate 68 is in complete contact with the temporary support, loosen the tie rod 35 to complete the adjustment of the working angle of the jackhammer 4.

[0047] Finally, by pushing the pneumatic pick 4 to one side of the temporary support, the operator can break the concrete at the top connection node of the temporary support. The depth of the breakage is limited by the stop bar 67, which improves the demolition accuracy. After the breakage at this point is completed, the pneumatic pick 4 is retracted and the angle is swung to achieve the demolition operation in the vertical area near the temporary support. After all the above operations are completed, the pneumatic pick 4 can be moved on the railing of the carriage guardrail to continue to demolish the subsequent area. After the concrete at the connection node of the temporary support is demolished, the bolts at the connection can be cut to disconnect the connection with the initial support grid. Finally, the remaining concrete of the temporary support is demolished to complete the demolition of this section of the temporary support.

[0048] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0049] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0050] Additionally, "multiple" refers to two or more.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tunnel support dismantling device, characterized in that: Includes a rotating platform (1) and a pneumatic pick (4) located on top of the rotating platform (1). The bottom of the rotating platform (1) is provided with a splicing mechanism (2) that can be spliced ​​with the guardrail of the aerial work vehicle. A rotation limiting mechanism (3) for limiting the rotation of the rotating platform (1) is provided between the rotating platform (1) and the splicing mechanism (2). A guide mechanism (5) is provided on the top of the rotating platform (1) that is connected to the pneumatic pick (4) and guides the pneumatic pick (4) to move towards and away from the temporary support. A sliding limiting mechanism (6) is provided on the guide mechanism (5) for limiting the maximum distance that the pneumatic pick (4) can move towards the temporary support. The splicing mechanism (2) includes a splicing seat (21) rotatably disposed at the bottom of the rotating platform (1). The bottom of the splicing seat (21) is provided with at least two sets of clamping components that can be clamped on the guardrail of the carriage and two strip-shaped rollers (22) that can roll on the top of the guardrail. The clamping components include a fixed strip (23) fixedly disposed at the bottom of the splicing seat (21) and a movable strip (24) slidably disposed at the bottom of the splicing seat (21). The splicing seat (21) is threaded with a first adjusting screw (25) for driving the movable strip (24) to move closer to and further away from the fixed strip (23). The rotation limiting mechanism (3) includes a central shaft (31) fixedly installed at the bottom of the rotating platform (1) and passing through the splicing seat (21). A gear (32) is fixedly installed at the bottom end of the central shaft (31). The rotation limiting mechanism (3) also includes a vertical plate (33) fixedly installed on the splicing seat (21). A limiting tooth plate (34) meshing with the gear (32) is provided between the vertical plate (33) and the gear (32). A pull rod (35) for driving the limiting tooth plate (34) to move closer to and away from the gear (32) is slidably installed on the vertical plate (33). A first compression spring (36) sleeved on the pull rod (35) is provided between the limiting tooth plate (34) and the vertical plate (33). When the first compression spring (36) is in its natural state, the gear (32) meshes with the limiting tooth plate (34). The guiding mechanism (5) includes two side plates (51) set on the top of the rotating platform (1). Each of the two side plates (51) is rotatably provided with a guide rail (52) on the opposite side. The guide rail (52) is provided with a guide groove to guide the pneumatic pick (4) to move towards and away from the temporary support. The pneumatic pick (4) is slidably set between the two guide rails (52). The sliding limiting mechanism (6) includes a sliding plate (61) and a threaded seat (62) mounted on one of the guide rails (52). The threaded seat (62) is threaded with a second adjusting screw (63) for moving the sliding plate (61) towards and away from the temporary support. An outer sleeve (64) is provided at the end of the sliding plate (61) away from the guide rail (52). A telescopic groove is provided at the end of the outer sleeve (64) near the temporary support, and a second compression spring (65) is provided within the telescopic groove. A sliding connection to the outer sleeve (64) near the temporary support is slidably provided at the end of the outer sleeve (64). The top rod (66) in the telescopic groove is provided with a baffle (67) that moves with the top rod (66) and is inserted into the guide groove at one end. The top plate (68) is provided at the end of the top rod (66) outside the outer sleeve (64). The working end of the top rod (66) and the pneumatic pick (4) are in the same horizontal plane. When the top plate (68) contacts the temporary support, the breaking depth of the pneumatic pick (4) is limited by the baffle (67) because the baffle (67) is in the moving direction of the pneumatic pick (4), so that the pneumatic pick (4) can maintain a consistent breaking depth at different positions.

2. The tunnel support dismantling device according to claim 1, characterized in that: The side plate (51) is detachably provided with a protective plate (7) sleeved on the jackhammer (4). The protective plate (7) is composed of an inverted U-shaped plate and inclined plates at both ends of the U-shaped plate. The inclined plates are inclined to the side away from the guardrail of the carriage.

3. A method for dismantling tunnel support, characterized in that: Including a tunnel support dismantling device as described in any one of claims 1-2, the method is as follows: First, by rotating the first adjusting screw (25), the movable strip (24) is moved away from the fixed strip (23). Then, the splicing mechanism (2) is moved to the top of the car railing, aligned with the car railing, and moved downwards to keep the railing of the car railing between the movable strip (24) and the fixed strip (23) until the strip roller (22) contacts the railing of the car railing. Then, the first adjusting screw (25) is rotated in the opposite direction to move the movable strip (24) closer to the fixed strip (23) until the movable strip (24) can no longer move. Then, the first adjusting screw (25) is rotated back a quarter turn so that the distance between the movable strip (24) and the fixed strip (23) is slightly greater than the thickness of the railing of the car railing, so that the jackhammer (4) can move horizontally on the railing of the car railing through the splicing mechanism (2). Afterwards, control the aerial work vehicle to raise the carriage, so that the side of the carriage with the jackhammer (4) is as close as possible to the connection node of the top of the temporary support to be demolished, and at the same time, make the side of the sliding limit mechanism (6) in the direction of the temporary support demolition. Since the carriages move at different angles, when it is observed that the jackhammer (4) is not perpendicular to the temporary support surface, first adjust the carriage so that the top plate (68) contacts the temporary support, then pull the lever (35) away from the gear (32) so that the limit tooth plate (34) is disengaged from the gear (32), then rotate the jackhammer (4) and observe the contact state between the top plate (68) and the temporary support. When the top plate (68) is in complete contact with the temporary support, loosen the lever (35) to complete the adjustment of the working angle of the jackhammer (4). Finally, by pushing the pneumatic pick (4) to one side of the temporary support, the operator can break the concrete at the top connection node of the temporary support. The depth of the breakage is limited by the stop bar (67), which improves the demolition accuracy. After the breakage at this point is completed, the pneumatic pick (4) is retracted and the angle is swung to achieve the demolition operation of the vertical area near the temporary support. After all the above operations are completed, the pneumatic pick (4) can be moved on the railing of the carriage guardrail to continue to demolish the subsequent area. After the concrete at the connection node of the temporary support is demolished, the bolts at the connection can be cut to disconnect the connection with the initial support grid. Finally, the remaining concrete of the temporary support is demolished to complete the demolition of this section of the temporary support.

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