An assembled subway station roof low-clearance sliding construction method

Abstract

The application discloses an assembled subway station roof low-clearance sliding construction method, which comprises the following steps: step one, setting a roller set on the side wall of the subway station; step two, placing the roof block in the vertical direction onto the roller set; step three, moving the roof block to a predetermined position along the subway running direction through a positioning assembly and a driving assembly; step four, placing the roof block from the positioning assembly and fixing it on the side wall; and step five, repeating steps two to four, so that the roof block forms the roof of the subway station. Compared with the prior art, after the positioning assembly and the driving assembly are used, the roof block can be moved in the vertical and horizontal directions, so that the roof block can be smoothly placed on the side wall without interfering with the concrete counter-support on the top of the foundation pit, the support changing process is reduced, the construction time is accelerated, the stress change in the foundation pit is reduced, and the construction risk of the foundation pit is reduced.

Description

Technical Field

[0001] This invention relates to the field of subway station construction, and in particular to a method for low-clearance sliding construction of prefabricated subway station roof slabs. Background Technology

[0002] In the construction of subway stations using precast panels, the construction steps include foundation pit excavation, concrete bracing installation, and installation of precast subway station panels.

[0003] When splicing the top slabs of prefabricated subway station components, the concrete supports at the top are located directly above the pre-positioned top slab, obstructing the vertical installation of the top slab. Therefore, it is necessary to replace the top concrete supports with steel structure supports of the same height. The specific procedures are: cutting and hoisting the original concrete supports, vertically lowering and installing the top slab, and installing the steel structure supports. However, replacing supports one by one takes a long time, which is not conducive to the rapid construction of the subway station. Moreover, there is a risk of stress deformation during the support replacement process. Therefore, this application provides a prefabricated subway station top slab low-clearance sliding construction device and method. Summary of the Invention

[0004] This invention aims to solve the technical problems existing in the above-mentioned related technologies, and proposes a low-clearance sliding construction method for prefabricated subway station roof slabs, which can accelerate the construction speed of roof slabs and reduce the risk of stress deformation during construction.

[0005] The solution to the technical problem of this invention is: A method for low-clearance sliding construction of prefabricated subway station roof slabs includes: Step 1: Install roller sets on the side walls of the subway station; Step 2: Lower the top plate vertically onto the roller assembly; Step 3: Move the top plate to the predetermined position along the subway's travel direction using the positioning and driving components; Step 4: Lower the top panel from the positioning component and secure it to the side wall: Step 5: Repeat steps 2 to 4 to form the top plate of the subway station.

[0006] This technical solution has at least the following beneficial effects: The positioning component and the top plate are vertically hoisted and lowered onto the roller assembly. At this point, the projections of the top plate and the concrete support above do not overlap on the horizontal plane. Then, the driving component is used to move the positioning component and the top plate synchronously along the horizontal direction to the predetermined position, allowing the top plate to pass over it. Subsequently, the top plate is lowered onto the side wall, and the top plate and the side wall below are connected and fixed using connecting steel wires and bolts. After repeating this process multiple times, multiple top plates form the roof slab of the station. Through the above solution, after using the positioning component and the driving component, the top plate can move in both the vertical and horizontal directions, thus enabling the top plate to be smoothly lowered onto the side wall without interfering with the concrete support at the top of the foundation pit. Moreover, it reduces the support replacement process, speeds up the construction time, reduces stress changes within the foundation pit, and lowers the construction risk of the foundation pit.

[0007] As a further improvement to the above technical solution, the drive assembly includes a steel cable and a winch. The winch is installed on the roof of the subway station. One end of the steel cable is connected to the output end of the winch, and the other end is connected to the positioning assembly.

[0008] By adopting the above technical solution, the top slab is first vertically lowered at a location without interference from the top concrete bracing, forming part of the station roof slab. Then, a winch and steel cables are installed at this location. Subsequently, a crane is used to vertically lower the positioning component and the top slab to the side wall. The steel cables and positioning component are then connected, allowing the positioning component to move the top slab to be installed and connect with the completed roof slab. Winding up the steel cables allows the positioning component and steel cables to move horizontally. This solution eliminates the need to drag the positioning component and top slab from above using a crane, reducing the difficulty of moving the positioning component.

[0009] As a further improvement to the above technical solution, the positioning component includes a positioning frame and a hook. The positioning frame can slide on the roller assembly. A clamping cavity is provided on the side of the positioning frame near the top plate. The top plate is detachably installed in the clamping cavity. The hook is installed on the side of the positioning frame away from the top plate. A protrusion is provided on the top of the side wall for insertion into the corresponding top plate. The hook can be hooked onto the adjacent protrusion. When the hook is hooked onto the protrusion, the top plate moves to a predetermined position.

[0010] By adopting the above technical solution, after the crane vertically lifts the top plate onto the side wall, the crane continues to lift the positioning frame onto the side wall and abuts against the roller assembly. After the positioning frame moves to the position where the top plate is located in the clamping cavity, it stabilizes the top plate in the clamping cavity, allowing the positioning frame to move together with the top plate on the side wall. When the top plate moves to the predetermined position, that is, when the top plate is directly above the corresponding cam, the hook on the positioning frame is hooked onto the adjacent cam that is away from the top plate. Because the distance between adjacent cams on the side wall is fixed, the positioning frame, the hook, and the adjacent cam ensure that the horizontal distance between the hook and the top plate to be installed is relatively fixed. This solution reduces manual intervention during the installation of the top plate, and allows the positioning frame to automatically align the top plate with the cam after movement, improving the safety and automation of construction.

[0011] As a further improvement to the above technical solution, the positioning frame is provided with multiple clamping cylinders arranged horizontally and perpendicularly to the direction of subway travel on both the upper and lower sides of the clamping cavity, with the upper clamping cylinder and the lower clamping cylinder respectively abutting against the upper and lower sides of the top plate. Step three further includes: using the upper clamping cylinder and the lower clamping cylinder to clamp the top plate; Step four further includes: using the clamping cylinder on the lower side to lift the top plate to a height higher than the roller assembly, then removing the roller assembly below the top plate, and then using the clamping cylinder on the lower side to lower the top plate to the side wall.

[0012] By adopting the above technical solution, when the positioning frame and the top plate move synchronously to the predetermined position, the upper and lower clamping cylinders work simultaneously to clamp the top plate in the clamping cavity, so that the positioning frame and the top plate slide synchronously under the action of the drive component. When the top plate moves to the predetermined position, the lower clamping cylinder lifts the top plate. At this time, the top plate no longer abuts against the roller assembly below it, so that the roller assembly at this point is in a free state and can move freely. Therefore, after the roller assembly at this point is removed, the clamping cylinder located below the clamping cavity descends, thereby lowering the top plate until the top plate is placed on the side wall, completing the placement of the top plate. Then, the upper and lower clamping cylinders completely leave the top plate, causing the positioning frame to separate from the top plate and pull the positioning frame backward on the side wall, leaving space for the next top plate to be placed, and then continuing to lower the next top plate.

[0013] This solution eliminates the need for a crane above the pit to lift the top slab after it is lowered. Instead, the positioning frame can be used for small-scale operations within the pit, reducing the workload of the crane and significantly shortening the operation time. Furthermore, the automated operation of the clamping cylinders further reduces the amount of manual labor.

[0014] As a further improvement to the above technical solution, the positioning frame is provided with multiple stabilizing cylinders on the upper and lower sides of the clamping cavity and at the end of the clamping cylinder near the top plate. The multiple stabilizing cylinders are arranged horizontally and perpendicular to the subway travel direction. Stabilizing wheels are installed at the output ends of the multiple stabilizing cylinders. The positioning frame can be moved until the stabilizing wheels abut against the top plate.

[0015] By adopting the above technical solution, during the movement of the top plate driven by the positioning frame, since the positioning frame only contacts the roller group at the rear and the top plate with a certain weight at the front, in order to improve the stability of the positioning frame and the top plate during movement, a stabilizing wheel is set in the clamping cavity. When the positioning frame slides, the stabilizing wheel can abut against the already installed top plate, so that the positioning frame abuts against the stable building on both the front and rear sides along the subway travel direction, thereby improving the stability of the positioning frame movement. During the process of the positioning frame moving to clamp the top plate, the stabilizing cylinder can extend and retract the stabilizing wheel so that when the top plate enters the clamping cavity, it does not interfere with the stabilizing wheel.

[0016] As a further improvement to the above technical solution, a sliding groove is provided on the positioning frame along the subway travel direction, and a sliding rod is slidably installed in the sliding groove. The side of the sliding rod away from the positioning frame extends out of the positioning frame and is connected to the hook. One end of the sliding rod located inside the positioning frame is provided with a first guide surface on both sides of the horizontal direction perpendicular to the subway travel direction. The positioning frame is provided with a top rod on both sides of the horizontal direction perpendicular to the subway travel direction. The top rod can slide on the positioning frame along the horizontal direction perpendicular to the subway travel direction. One end of the top rod is provided with a second guide surface and can abut against the first guide surface. The other end can slide out of the positioning frame. The end of the top rod extending out of the positioning frame is provided with a friction block, which can abut against the side wall of the pit where the subway station is located.

[0017] By adopting the above technical solution, during the movement of the positioning frame, the hook first abuts against the adjacent cam, making the hook and cam relatively stable. Then the positioning frame continues to move, causing the fixed hook to drive the sliding rod to move in the sliding groove until the positioning frame and the top plate therein are close to the predetermined position. At this time, the first guide surface on the sliding rod abuts against the second guide surface on the top rod. As the two guide surfaces continue to contact, the sliding rod drives the top rod to move along the horizontal and vertical direction of the subway travel, so that the end of the top rod gradually protrudes outside the positioning frame and abuts against the inner wall of the pit. As the positioning frame gradually approaches the predetermined position, the positioning frame gradually decelerates, reducing the risk of the top plate colliding with the top plate when the positioning frame moves too fast.

[0018] As a further improvement to the above technical solution, the roller assembly includes multiple roller units, which are movable relative to the side wall and can move away from the top plate.

[0019] By adopting the above technical solution, on the one hand, the roller assembly is divided into multiple independent roller units. The layout and number of roller units can be flexibly adjusted according to the size and weight of the top plate and the construction space of the side wall, avoiding the problem of insufficient adaptability caused by the fixed size of the overall roller assembly. For example, for a narrow top plate, the number of roller units can be reduced to lower the construction cost. On the other hand, the roller units can move away from the top plate. When the top plate has completed its horizontal sliding and needs to be lowered to the side wall, there is no need to completely dismantle the roller assembly. Only the roller units at the corresponding positions need to be moved away from the top plate to make room for the lowering of the top plate. This not only simplifies the construction process but also avoids the disturbance to the side wall structure caused by dismantling the roller assembly.

[0020] As a further improvement to the above technical solution, the positioning frame is divided into a clamping part, an empty part and a moving part in sequence along the subway's forward direction. The moving part abuts against the roller unit, the empty part does not abut against the roller unit, and the clamping part clamps against the top plate.

[0021] By adopting the above technical solution, after the clamping cylinder lifts the top plate, the roller unit located at the clamping part is in a free state. At this time, the worker moves the roller unit at the clamping part to the empty area to ensure that the top plate can be placed at the clamping part and reduce the collision between it and the roller unit.

[0022] As a further improvement to the above technical solution, the hook is rotatably mounted on the sliding rod around a horizontal axis. The hook can rotate to a height higher or lower than the height of the convex machine. When the height of the hook is lower than the height of the convex machine, the hook is hung on the convex machine.

[0023] By adopting the above technical solution, when the positioning frame moves the top plate to the predetermined position, the hook is rotated to a height lower than that of the convex machine, so that the hook can stably abut against the convex machine during the movement of the positioning frame. When the positioning frame moves away from the top plate that has been constructed, the hook is rotated to a height higher than that of the convex machine, so that the adjacent convex machine behind it collides during the horizontal movement of the positioning frame. Attached Figure Description

[0024] Figure 1 This is a front view of the subway station of the present invention along the direction of travel; Figure 2 This is a schematic diagram of the subway station structure after the positioning components and top plate of the present invention are assembled; Figure 3 yes Figure 2 Enlarged view of A in the middle; Figure 4 This is a schematic diagram of the overall structure of the positioning component of the present invention; Figure 5 This is a side view of the positioning component of the present invention; Figure 6 The positioning component of the present invention is along Figure 5 A cross-sectional view from the perspective of a BB (Black-White) camera.

[0025] In the diagram, 1. Side wall; 2. Roller assembly; 3. Roller unit; 4. Top plate; 5. Positioning assembly; 6. Positioning frame; 7. Clamping cavity; 8. Clamping cylinder; 9. Stabilizing cylinder; 10. Stabilizing wheel; 11. Hook; 12. Protrusion; 13. Drive assembly; 16. Sliding groove; 17. Sliding rod; 18. First guide surface; 19. Top rod; 20. Second guide surface; 21. Friction block; 22. Clamping part; 23. Empty part; 24. Moving part; 25. Top plate. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0028] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0030] A method for sliding construction of a prefabricated subway station roof slab with a 25-meter low clearance, referring to... Figures 1-6 ,include: S100: A roller assembly 2 is installed on the side wall 1 of the subway station, wherein the roller assembly 2 is located on the side of the side wall 1 protruding machine 12 close to the other side wall 1. S200: The top plate 4 is lowered vertically onto the roller assembly 2 using a crane; S300: The positioning component 5 is hoisted onto the side wall 1 by a crane, and then the top plate 4 is moved to the predetermined position along the subway travel direction by the positioning component 5 and the drive component 13. S400: Lower the top panel 4 from the positioning component 5 and fix it to the side wall 1: S500: Repeat S200 to S400 to form the top plate 4, which forms the top plate 25 of the subway station.

[0031] As described above, the positioning component 5 and the top plate 4 are vertically hoisted and lowered onto the roller assembly 2. At this point, the projections of the top plate 4 and the concrete support above do not overlap on the horizontal plane. Then, the driving component 13 is used to drive the positioning component 5 and the top plate 4 to move synchronously to the predetermined position in the horizontal direction, allowing the top plate 4 to pass over it. Subsequently, the top plate 4 is lowered onto the side wall 1, and the top plate 4 and the side wall 1 below are connected and fixed using connecting steel wires and bolts. After repeating this process multiple times, multiple top plates 4 form the station's top plate 25. Through the above scheme, after using the positioning component 5 and the driving component 13, the top plate 4 can move in both the vertical and horizontal directions, allowing the top plate 4 to be smoothly lowered onto the side wall 1 without interfering with the concrete support at the top of the pit. Moreover, it reduces the support replacement process, speeds up construction time, reduces stress changes within the pit, and lowers the construction risk of the pit.

[0032] To facilitate the movement of the positioning component 5 and the top plate 25 in the narrow foundation pit, this application utilizes the already installed top plate 25. Specifically, the drive component 13 includes a steel cable and a winch. The winch is installed on the top plate 25 of the subway station. One end of the steel cable is connected to the output end of the winch, and the other end is connected to the positioning component 5. First, the top plate 4 is vertically lowered at a location without interference from the top concrete support to form part of the station top plate 25. Then, the winch and steel cable are installed at this location. Subsequently, the positioning component 5 and the top plate 4 are vertically lowered to the side wall 1 by a crane. Then, the steel cable and the positioning component 5 are connected, so that the positioning component 5 drives the top plate 4 to be installed and connects with the completed top plate 25. Winding up the steel cable allows the positioning component 5 and the steel cable to move horizontally. With this scheme, it is not necessary to drag the positioning component 5 and the top plate 4 from above by a crane, which reduces the difficulty of moving the positioning component 5.

[0033] As a further embodiment, the positioning component 5 includes a positioning frame 6 and a hook 11. The positioning frame 6 can slide on the roller assembly 2. A clamping cavity 7 is provided on the side of the positioning frame 6 near the top plate 25. The top plate 4 is detachably installed in the clamping cavity 7. The hook 11 is installed on the side of the positioning frame 6 away from the top plate 25. A protrusion 12 for inserting into the corresponding top plate 4 is provided on the top of the side wall 1. The hook 11 can be hooked onto the adjacent protrusion 12. When the hook 11 is hooked onto the protrusion 12, the top plate 4 moves to a predetermined position.

[0034] As described above, after the crane vertically lifts the top plate 4 onto the side wall 1, the crane continues to lift the positioning frame 6 onto the side wall 1, where it abuts against the roller assembly 2. After the positioning frame 6 moves until the top plate 4 is located in the clamping cavity 7, it stabilizes the top plate 4 within the clamping cavity 7, allowing the positioning frame 6 to move together with the top plate 4 on the side wall 1. When the top plate 4 moves to the predetermined position, i.e., when the top plate 4 is directly above the corresponding protrusion 12, the hook 11 on the positioning frame 6 hooks onto the adjacent protrusion 12 that is away from the top plate 25. Because the distance between adjacent protrusions 12 on the side wall 1 is fixed, the positioning frame 6, the hook 11, and the adjacent protrusion 12 ensure that the horizontal distance between the hook 11 and the top plate 4 to be installed is relatively fixed. This scheme reduces manual intervention during the installation of the top plate 4, allowing the positioning frame 6 to automatically align the top plate 4 with the protrusion 12 after movement, thus improving the safety and automation of the construction.

[0035] Specifically, the width of the positioning frame 6 at the positioning cavity is smaller than the width at the non-positioning cavity, so that the part holding the top plate 4 can extend into the top plate 25 that has been constructed.

[0036] Furthermore, the positioning frame 6 has multiple clamping cylinders 8 arranged horizontally and perpendicularly to the direction of subway travel on both the upper and lower sides of the clamping cavity 7. The upper clamping cylinder 8 and the lower clamping cylinder 8 respectively abut against the upper and lower sides of the top plate 4.

[0037] S300 also includes S310: using the upper clamping cylinder 8 and the lower clamping cylinder 8 to clamp the top plate 4; S400 also includes S410 using the lower clamping cylinder 8 to lift the top plate 4 to a height higher than the roller assembly 2, then removing the roller assembly 2 below the top plate 4, and then using the lower clamping cylinder 8 to lower the top plate 4 to the side wall 1.

[0038] As described above, when the positioning frame 6 and the top plate 4 move synchronously to the predetermined position, the upper clamping cylinder 8 and the lower clamping cylinder 8 work simultaneously to clamp the top plate 4 in the clamping cavity 7, so that the positioning frame 6 and the top plate 4 slide synchronously under the action of the drive component 13. When the top plate 4 moves to the predetermined position, the lower clamping cylinder 8 lifts the top plate 4. At this time, the top plate 4 no longer abuts against the roller group 2 below it, so that the roller group 2 at this point is in a free state and can move freely. Therefore, after the roller group 2 at this point is removed, the clamping cylinder 8 located below the clamping cavity 7 descends, thereby lowering the top plate 4 until the top plate 4 is placed on the side wall 1, completing the placement of the top plate 4. Then, the upper and lower clamping cylinders 8 completely leave the top plate 4, so that the positioning frame 6 separates from the top plate 4 and pulls the positioning frame 6 backward on the side wall 1, leaving space for the next top plate 4 to be placed, and then continuing to lower the next top plate 4.

[0039] This design eliminates the need for a crane above the pit to lift the top plate 4 after it is lowered. The positioning frame 6 can operate within the pit, reducing the crane's workload and significantly reducing the operation time. Furthermore, the automated operation of the clamping cylinder 8 further reduces the amount of manual labor.

[0040] To improve the stability of the positioning component 5 at one end of the clamping cavity on the top plate 4, the positioning frame 6 is provided with multiple stabilizing cylinders 9 on the upper and lower sides of the clamping cavity 7 and at the end of the clamping cylinder 8 near the top plate 25. The multiple stabilizing cylinders 9 are arranged horizontally and perpendicular to the subway travel direction. Stabilizing wheels 10 are installed at the output ends of the multiple stabilizing cylinders 9. The positioning frame 6 can move until the stabilizing wheels 10 abut against the top plate 25.

[0041] During the movement of the positioning frame 6 and the top plate 4, since the positioning frame 6 only contacts the bottom roller group 2 on its rear side and is clamped on the top plate 4 with a certain weight in its front, in order to improve the stability of the positioning frame 6 and the top plate 4 during movement, a stabilizing wheel 10 is set in the clamping cavity 7. When the positioning frame 6 slides, the stabilizing wheel 10 can abut against the already installed top plate 25, so that the positioning frame 6 abuts against the stable building on both the front and rear sides along the subway travel direction, thereby improving the stability of the movement of the positioning frame 6. During the process of the positioning frame 6 moving to clamp the top plate 4, the stabilizing cylinder 9 can extend and retract the stabilizing wheel 10 so that when the top plate 4 enters the clamping cavity 7, it does not interfere with the stabilizing wheel 10.

[0042] Furthermore, the roller assembly 2 includes multiple roller units 3, which are movable relative to the side wall 1 and can move away from the top plate 25.

[0043] By adopting the above technical solution, on the one hand, the roller assembly 2 is divided into multiple independent roller units 3. The layout position and number of roller units 3 can be flexibly adjusted according to the size and weight of the top plate 4 and the construction space of the side wall 1, avoiding the problem of insufficient adaptability caused by the fixed size of the overall roller assembly 2. For example, for a narrower top plate 4, the number of roller units 3 can be reduced to lower the construction cost. On the other hand, the roller units 3 can move away from the top plate 25. When the top plate 4 has completed the horizontal sliding and needs to be lowered to the side wall 1, there is no need to completely dismantle the roller assembly 2. Only the roller units 3 at the corresponding positions need to be moved away from the top plate 25 to make room for the lowering of the top plate 4. This not only simplifies the construction process, but also avoids the disturbance to the structure of the side wall 1 caused by the removal of the roller assembly 2.

[0044] As a further improvement to the above technical solution, the positioning frame 6 is divided into a clamping part 22, an empty part 23 and a moving part 24 along the subway's forward direction. The moving part 24 abuts against the roller unit 3, the empty part does not abut against the roller unit 3, and the clamping part 22 clamps against the top plate 4.

[0045] By adopting the above technical solution, after the clamping cylinder 8 lifts the top plate 4, the roller unit 3 located at the clamping part 22 is in a free state. At this time, the worker moves the roller unit 3 at the clamping part 22 to the empty area to ensure that the top plate 4 can be placed at the clamping part 22 and reduce the collision between it and the roller unit 3.

[0046] As a further improvement to the above technical solution, the hook 11 is rotatably mounted on the sliding rod 17 around the horizontal axis. The hook 11 can rotate to a height that is higher or lower than the height of the convex machine 12. When the height of the hook 11 is lower than the height of the convex machine 12, the hook 11 is hung on the convex machine 12.

[0047] By adopting the above technical solution, when the positioning frame 6 moves the top plate 4 to the predetermined position, the hook 11 is rotated to a height lower than that of the protrusion machine 12, so that the hook 11 can stably abut against the protrusion machine 12 during the movement of the positioning frame 6. When the positioning frame 6 moves away from the top plate 25 that has been constructed, the hook 11 is rotated to a height higher than that of the protrusion machine 12, so that the adjacent protrusion machine 12 on the rear side collides during the horizontal movement of the positioning frame 6.

[0048] Specifically, a rotary cylinder is rotatably mounted on the sliding rod 17, and the output end of the rotary cylinder is rotatably connected to the hook 11. Activating the rotary cylinder will drive the hook 11 to rotate.

[0049] To decelerate the positioning frame 6 as it approaches the top plate 25, a sliding groove 16 is provided on the positioning frame 6 along the subway travel direction. A sliding rod 17 is slidably installed in the sliding groove 16. The side of the sliding rod 17 facing away from the positioning frame 6 extends out of the positioning frame 6 and is connected to the hook 11. One end of the sliding rod 17 located inside the positioning frame 6 is provided with a first guide surface 18 on both sides of the horizontal direction perpendicular to the subway travel direction. A top rod 19 is provided on both sides of the positioning frame 6 along the horizontal direction perpendicular to the subway travel direction. The top rod 19 can slide on the positioning frame 6 along the horizontal direction perpendicular to the subway travel direction. One end of the top rod 19 is provided with a second guide surface 20 and can abut against the first guide surface 18. The other end can slide out of the positioning frame 6. A friction block 21 is provided at the end of the top rod 19 that extends out of the positioning frame 6. The friction block 21 can abut against the side wall of the pit where the subway station is located.

[0050] By adopting the above technical solution, during the movement of the positioning frame 6, the hook 11 first abuts against the adjacent protrusion 12, making the hook 11 and the protrusion 12 relatively stable. Then the positioning frame 6 continues to move, causing the fixed hook 11 to drive the sliding rod 17 to move in the sliding groove 16 until the positioning frame 6 and the top plate 4 therein are close to the predetermined position. The first guide surface 18 on the sliding rod 17 abuts against the second guide surface 20 on the top rod 19. As the two guide surfaces continue to contact, the sliding rod 17 drives the top rod 19 to move along the horizontal and vertical subway travel direction, so that the end of the top rod 19 gradually protrudes outside the positioning frame 6 and abuts against the inner wall of the pit. Thus, as the positioning frame 6 gradually approaches the predetermined position, the positioning frame 6 gradually decelerates, reducing the risk of the top plate 4 and the top plate 25 colliding when the positioning frame 6 moves too fast.

[0051] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A method for low-clearance sliding construction of prefabricated subway station roof slabs, characterized in that, include: Step 1: Install roller assembly (2) on the side wall (1) of the subway station; Step 2: Lower the top plate (4) vertically onto the roller assembly (2); Step 3: Move the top plate (4) to the predetermined position along the subway travel direction using the positioning component (5) and the drive component (13); Step 4: Lower the top panel (4) from the positioning component (5) and fix it to the side wall (1): Step 5: Repeat steps 2 to 4 to make the top plate (4) form the top plate (25) of the subway station.

2. The method for low-clearance sliding construction of prefabricated subway station roof slabs according to claim 1, characterized in that, The drive assembly (13) includes a steel cable and a winch. The winch is installed on the roof (25) of the subway station. One end of the steel cable is connected to the output end of the winch, and the other end is connected to the positioning assembly (5).

3. The method for low-clearance sliding construction of prefabricated subway station roof slabs according to claim 1, characterized in that, The positioning component (5) includes a positioning frame (6) and a hook (11). The positioning frame (6) can slide on the roller assembly (2). The positioning frame (6) has a clamping cavity (7) on the side near the top plate (25). The top plate (4) is detachably installed in the clamping cavity (7). The hook (11) is installed on the side of the positioning frame (6) away from the top plate (25). The top of the side wall (1) is provided with a protrusion (12) for insertion into the corresponding top plate (4). The hook (11) can be hooked onto the adjacent protrusion (12). When the hook (11) is hooked onto the protrusion (12), the top plate (4) moves to a predetermined position.

4. The method for low-clearance sliding construction of prefabricated subway station roof slab according to claim 3, characterized in that, The positioning frame (6) has multiple clamping cylinders (8) arranged on the upper and lower sides of the clamping cavity (7) along the horizontal direction perpendicular to the direction of subway travel. The upper clamping cylinder (8) and the lower clamping cylinder (8) respectively abut against the upper and lower sides of the top plate (4). Step three also includes: using the upper clamping cylinder (8) and the lower clamping cylinder (8) to clamp the top plate (4); Step four further includes: using the clamping cylinder (8) on the lower side to lift the top plate (4) to a height higher than the roller assembly (2), then removing the roller assembly (2) below the top plate (4), and then using the clamping cylinder (8) on the lower side to lower the top plate (4) to the side wall (1).

5. The method for low-clearance sliding construction of prefabricated subway station roof slab according to claim 3, characterized in that, The positioning frame (6) has multiple stabilizing cylinders (9) on the upper and lower sides of the clamping cavity (7) and at one end of the clamping cylinder (8) near the top plate (25). The multiple stabilizing cylinders (9) are arranged horizontally and perpendicular to the subway travel direction. Each of the output ends of the multiple stabilizing cylinders (9) is equipped with a stabilizing wheel (10). The positioning frame (6) can move until the stabilizing wheel (10) abuts against the top plate (25).

6. The method for low-clearance sliding construction of prefabricated subway station roof slab according to claim 5, characterized in that, The positioning frame (6) has a sliding groove (16) along the subway travel direction. A sliding rod (17) is slidably installed in the sliding groove (16). The side of the sliding rod (17) facing away from the positioning frame (6) extends out of the positioning frame (6) and is connected to the hook (11). One end of the sliding rod (17) located in the positioning frame (6) is provided with a first guide surface (18) on both sides along the horizontal direction perpendicular to the subway travel direction. The positioning frame (6) is along the horizontal direction perpendicular to the subway travel direction. Top rods (19) are provided on both sides of the positioning frame (6). The top rods (19) can slide horizontally and perpendicularly to the direction of subway travel on the positioning frame (6). One end of the top rod (19) is provided with a second guide surface (20) and can abut against the first guide surface (18). The other end can slide to extend out of the positioning frame (6). A friction block (21) is provided at the end of the top rod (19) that extends out of the positioning frame (6). The friction block (21) can abut against the side wall of the pit where the subway station is located.

7. The method for low-clearance sliding construction of prefabricated subway station roof slab according to claim 5, characterized in that, The roller assembly (2) includes multiple roller units (3), which are movable relative to the side wall (1) and can move away from the top plate (25).

8. The method for low-clearance sliding construction of prefabricated subway station roof slab according to claim 7, characterized in that, The positioning frame (6) is divided into a clamping part (22), an empty part (23) and a moving part (24) in sequence along the subway forward direction. The moving part (24) abuts against the roller unit (3), the empty area does not abut against the roller unit (3), and the clamping part (22) clamps against the top plate (4).

9. A method for low-clearance sliding construction of prefabricated subway station roof slabs according to claim 3, characterized in that, The hook (11) is rotatably mounted on the sliding rod (17) around the horizontal axis. The hook (11) can rotate to a height higher or lower than the height of the convex machine (12). When the height of the hook (11) is lower than the height of the convex machine (12), the hook (11) is hung on the convex machine (12).

Images