Construction structure for covering and excavating top plate of subway station

Abstract

The invention belongs to the related technical field of subway construction, and particularly discloses a subway station cover and excavation roof construction structure which comprises a deep foundation pit supporting module and a pushing mechanism, the pushing mechanism is located on the edge of one side of the deep foundation pit supporting module, and the upper end face of the pushing mechanism is connected with a frame base through an arranged reinforcing mechanism; a U-shaped frame is fixedly installed on the outer wall of one end of the frame base, a sliding base is connected to the interior of the U-shaped frame through an arranged driving mechanism, a telescopic shell is fixedly installed on the upper end face of the sliding base, a movable frame is slidably installed on the upper portion of the interior of the telescopic shell, and one end of the interior of the movable frame is connected with a connecting rod through an arranged rotating piece. According to the concrete compaction device, the concrete compaction problem at the joint of the cover and excavation top plate steel beams is solved, the efficiency is remarkably improved while the construction quality is guaranteed, and reliable technical support is provided for safe and efficient construction of the cover and excavation top plate of the subway station.

Description

Technical Field

[0001] This invention belongs to the technical field of subway construction, and specifically discloses a construction structure for the cut-and-cover roof slab of a subway station. Background Technology

[0002] In the top slab construction of the cut-and-cover method, steel beams (or steel-concrete composite beams) serve as the main load-bearing framework. A number of load-bearing beams are erected between the symmetrically arranged steel beams, and concrete is poured on the outside to form a composite structure. The sealing of the concrete forms the top slab (i.e., the road restoration layer / temporary road layer). The construction of the top slab is the core link of the entire project, and its quality directly affects the subsequent traffic restoration, the safety of the foundation pit, and the performance of the permanent structure.

[0003] However, in the triangular area where the web, flange and concrete of the steel beam meet, the steel beam flange forms a vertical baffle. Its structure will hinder the concrete from settling under its own weight, and a boundary layer will be generated on both sides. The aggregate will not be evenly distributed, and the grout will not be able to fill to the root of the steel beam.

[0004] The existing technology involves manually inserting small vibrators, with the vibrator heads penetrating deep into the gaps between the steel beams and load-bearing beams to disturb the concrete. However, this manual process results in uneven force and uncontrollable depth. During construction, it is impossible to quantitatively determine the local state of the concrete, relying on later testing. This leads to many potential problems and hidden dangers associated with using the top slab as a temporary pavement layer.

[0005] Therefore, a construction structure for the cut-and-cover roof slab of a subway station is proposed to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the background art, and to propose a construction structure for the excavated roof slab of a subway station, including a deep foundation pit support module and a pushing mechanism. The pushing mechanism is located on one side edge of the deep foundation pit support module. The upper end face of the pushing mechanism is connected to a frame base through a reinforcement mechanism. A U-shaped frame is fixedly installed on the outer wall of one end of the frame base. A sliding block is connected to the U-shaped frame through a driving mechanism. A telescopic shell is fixedly installed on the upper end face of the sliding block. A movable frame is slidably installed on the upper part of the telescopic shell. A connecting rod is connected to one end of the movable frame through a rotating component. A swing rod is rotatably inserted on one side of the lower part of the connecting rod. A ring frame is fixedly clamped inside the sliding block. A support rod is provided on one side of the ring frame. A rotating joint is embedded inside the support rod. The rotating joint passes through the outside of the swing rod. An L-shaped frame is fixedly fitted on the lower end of the swing rod. A rectangular frame is provided on one side of the L-shaped frame. A vibrating rod is connected to the rectangular frame through a vibration buffer mechanism. A vibrating shell is fixedly installed at the end of the vibrating rod.

[0007] In the above technical solution, the reinforcement mechanism further includes a fixed seat fixedly installed on the upper end face of the pushing mechanism, a column vertically installed on the upper end face of the fixed seat, and the frame is fixedly sleeved on the upper part of the column.

[0008] In the above technical solution, the vibration buffer mechanism further includes buffer columns symmetrically slidably installed on both sides inside the rectangular frame. The ends of the buffer columns that are close to each other are connected to the outside of the vibrating rod. A spring is fitted on the outside of the buffer column and inside the rectangular frame.

[0009] In the above technical solution, the L-shaped frame is further provided with a notch, and a vibration connecting rod is inserted inside the notch. A vibration motor is provided at one end of the vibration connecting rod, and the vibration motor is fixedly installed on the outer wall of one side of the L-shaped frame.

[0010] In the above technical solution, a hydraulic cylinder is further provided on the lower end face of the movable frame, the bottom of the hydraulic cylinder is fixedly connected to the slide, a nuclear density meter is fixedly installed on the lower end face of the slide, and a power supply box is connected to the upper end face of one side of the pushing mechanism through a fixedly connected support.

[0011] In the above technical solution, the rotating component further includes a second motor fixedly mounted inside one end of the movable frame, the output end of the second motor extending to the lower part of the connecting rod, and a meshing component is provided at the lower part of the movable frame.

[0012] In the above technical solution, the meshing component further includes fixed rods symmetrically installed inside the movable frame and close to both sides of the second motor. The lower end faces of the two fixed rods are provided with inclined teeth. A traveling gear is fixedly mounted on the upper part of the swing arm, and the traveling gear is meshed with the inclined teeth.

[0013] In the above technical solution, a fixing sleeve is fixedly installed on the lower outer side of the vibrating rod, and mounting rods are installed at equal intervals along the circumferential direction on the outer side of the fixing sleeve. The ends of multiple mounting rods are connected to a ring disk, and a high-pressure water pump is installed on the upper end face of the ring disk. High-pressure nozzles are installed at equal intervals along the circumferential direction inside the lower outer side of the ring disk.

[0014] In the above technical solution, the driving mechanism further includes a screw that rotates and passes through the inside of the U-shaped frame. One end of the screw is fixedly connected to a first motor, which is fixedly installed on the outside of one end of the U-shaped frame. The screw is threadedly connected to a slide block, and the outer wall of one end of the slide block slides against the inner wall of the U-shaped frame.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The drive mechanism drives the slide to move laterally back and forth along the inside of the U-shaped frame, which can cover the area above multiple sets of steel beams on one side of the deep foundation pit support module; at the same time, the second motor drives the connecting rod to rotate. Under the limiting action of the support rod and the rotating joint, the swing arm meshes with the upper traveling gear in the outer circumferential direction on the inclined tooth, driving the L-shaped frame, vibrator, vibrating shell and other structures to make an outer circumferential motion, so that the vibrating shell can penetrate into the triangular area formed by the flange and web of the steel beam. This solves the problem of frequently changing the position of the vibrator due to the operation of the manual vibrator, improves the uniformity of concrete filling, and reduces the workload of workers.

[0016] 2. By installing a nuclear density meter under the slide block, the concrete density can be monitored in real time during the vibration compaction process. When the local density is lower than the concrete coverage, the vibration motor is started, causing the vibrator to operate at high frequency until the density is reached. Then, it automatically moves to the next area, realizing the chain control of monitoring, adjustment and compaction operations. This solves the problem of traditional manual construction relying on experience judgment and difficulty in quantifying density, and improves the uniformity of the overall density of the top slab concrete.

[0017] 3. By setting buffer columns and springs inside the rectangular frame, the radial impact force generated during the operation of the vibrator can be absorbed, avoiding damage to the device structure caused by high-frequency vibration, while ensuring the vibrator can be used.

[0018] 4. By installing a ring disc, a high-pressure water pump, and a high-pressure nozzle on the lower exterior of the vibrator, the vibrator and vibrating shell can be rinsed and self-cleaned, reducing concrete residue adhering to the surface of the vibrating shell. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention in operation on one side of the deep foundation pit support module; Figure 2 This is a schematic diagram of the overall structure of the present invention in operation on one side of the deep foundation pit support module from another angle; Figure 3 This is a schematic diagram of the connection structure between the ring frame, the slide block, and the swing rod of the present invention; Figure 4 This is another schematic diagram of the connection structure between the ring frame, the slide block, and the swing rod of the present invention; Figure 5 This is a schematic diagram of the connection structure between the rectangular frame and the vibration buffer mechanism of the present invention; Figure 6 This is a schematic diagram of the connection structure between the annular disk and the high-pressure nozzle of the present invention.

[0020] In the diagram: 1. Deep foundation pit support module; 2. Pushing mechanism; 3. Fixed seat; 4. Power supply box; 5. Frame base; 6. Column; 7. First motor; 8. Screw; 9. Movable frame; 10. Second motor; 11. Ring frame; 12. Support; 13. U-shaped frame; 14. Telescopic shell; 15. Rectangular frame; 16. Traveling gear; 17. Rotating joint; 18. Support rod; 19. Fixed rod; 20. L-shaped frame; 21. Inclined tooth; 22. Connecting rod; 23. Nuclear density meter; 24. Slide seat; 25. Vibration shell; 26. Mounting rod; 27. Swing rod; 28. Vibration motor; 29. ​​Vibration rod; 30. Buffer column; 31. Fixed sleeve; 32. Ring disc; 33. Vibration connecting rod; 34. Spring; 35. High-pressure water pump; 36. High-pressure nozzle; 37. Hydraulic cylinder. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0023] like Figures 1-6 The diagram illustrates a construction structure for a subway station roof slab, including a deep foundation pit support module 1 and a pushing mechanism 2. The pushing mechanism 2 is located on one side edge of the deep foundation pit support module 1. A frame 5 is connected to the upper end of the pushing mechanism 2 via a reinforcement mechanism. A U-shaped frame 13 is fixedly installed on the outer wall of one end of the frame 5. A slide block 24 is connected inside the U-shaped frame 13 via a driving mechanism. A telescopic shell 14 is fixedly installed on the upper end of the slide block 24. A movable frame 9 is slidably installed above the telescopic shell 14. A connecting rod 22 is connected to one end of the movable frame 9 via a rotating component. A swing rod 27 is rotatably inserted into one side of the lower part of the connecting rod 22. A ring frame 11 is fixedly clamped inside the slide block 24. The moving mechanism includes a screw 8 that rotates and passes through the U-shaped frame 13. One end of the screw 8 is fixedly connected to a first motor 7, which is fixedly installed on the outside of one end of the U-shaped frame 13. The screw 8 is threadedly connected to the slide block 24. The outer wall of one end of the slide block 24 slides against the inner wall of the U-shaped frame 13. A support rod 18 is provided on one side inside the ring frame 11. A rotating joint 17 is embedded inside the support rod 18. The rotating joint 17 passes through the outside of the swing rod 27. An L-shaped frame 20 is fixedly fitted at the lower end of the swing rod 27. A rectangular frame 15 is provided on one side of the L-shaped frame 20. A vibrating rod 29 is connected inside the rectangular frame 15 through a vibration buffer mechanism. A vibrating shell 25 is fixedly installed at the end of the vibrating rod 29. like Figures 1-5As shown, the deep foundation pit support module 1 is composed of two steel beams and multiple horizontally arranged erection beams welded together, with the lower end of the steel beams connected to the bottom soil layer of the foundation pit. The propulsion mechanism 2 adopts an electric-assisted work vehicle equipped with a braking mechanism. During operation, it can control its movement and direction through its own electronic control. This is a relatively mature existing technology, so we will not go into too much detail. The drive mechanism drives the slide 24 to move laterally, enabling the vibration component to move within the deep foundation pit support module 1. The frame 5 and the U-shaped frame 13 are connected by welding, and both sides are equipped with reinforcement structures, which can improve the stability of the front-end suspended U-shaped frame 13 during operation; The telescopic shell 14 is equipped with a guide groove that adapts to the sliding of the movable frame 9, so that the movable frame 9 can slide inside and be adjusted according to the height of the concrete later. The connecting rod 22 is a curved rod, and its end near the rocker arm 27 is rotatably connected to the rocker arm 27 through a bushing. The rotating joint 17 adopts a ball-type universal wheel, which can flexibly rotate inside the support rod 18 according to the drive of the swing arm 27; The vibrator 29 is a hollow steel pipe, which is welded to the vibrating shell 25. The vibrating shell 25 has multiple sets of irregular notches inside. During the swinging process, it can enhance the contact disturbance effect with the concrete. When the notches rotate, they will generate shear eddies, forcibly breaking up the aggregate clumps. At the same time, in dealing with the air bubbles generated by the concrete agitation, it will contact the air bubbles and accelerate their rupture.

[0024] The reinforcement mechanism includes a fixed seat 3 that is fixedly installed on the upper end face of the push mechanism 2, a column 6 that is vertically installed on the upper end face of the fixed seat 3, and a frame 5 that is fixedly sleeved on the upper part of the column 6. like Figure 1 and Figure 2 As shown, the connection between the fixed base 3 and the column 6 allows the frame 5 to be stably erected above the pushing mechanism 2. The column 6 is a seamless steel pipe and is welded to the fixed base 3.

[0025] The vibration buffer mechanism includes buffer columns 30 symmetrically slidably installed on both sides inside the rectangular frame 15. The ends of the buffer columns 30 that are close to each other are connected to the outside of the vibrating rod 29. A spring 34 is fitted on the outside of the buffer column 30 and inside the rectangular frame 15. A notch is opened inside the L-shaped frame 20. A vibration connecting rod 33 is inserted inside the notch. A vibration motor 28 is provided at one end of the vibration connecting rod 33. The vibration motor 28 is fixedly installed on the outer wall of one side of the L-shaped frame 20. like Figures 3-5As shown, the vibration motor 28 can cause the vibrating rod 29 to vibrate through the vibration connecting rod 33. The notch inside the L-shaped frame 20 provides movement space for the vibration connecting rod 33 to avoid interference. The vibration impact force generated by the vibrating rod 29 can be consumed by the buffer column 30 inside the rectangular frame 15. The buffer column 30 slides along the inside of the frame and, in conjunction with the elastic deformation of the spring 34, absorbs the impact force of the vibration, reduces the damage of the vibration to the L-shaped frame 20 and the swing rod 27, and extends the service life of the equipment.

[0026] A hydraulic cylinder 37 is provided on the lower end face of the movable frame 9. The bottom of the hydraulic cylinder 37 is fixedly connected to the slide 24. A nuclear density meter 23 is fixedly installed on the lower end face of the slide 24. A power supply box 4 is connected to the upper end face of one side of the pushing mechanism 2 through a fixedly connected support 12. like Figure 1 , Figure 3 and Figure 4 As shown, the hydraulic cylinder 37 can drive the lifting and lowering of the movable frame 9 to ensure that the vibrating shell 25 can reach concrete at different depths; The nuclear density meter 23 detects the density of concrete by emitting rays and provides real-time feedback on the compaction results, providing a basis for vibration parameters. The power supply box 4 provides outdoor power for equipment such as motor units.

[0027] The rotating component includes a second motor 10 fixedly mounted inside one end of the movable frame 9. The output end of the second motor 10 extends to the lower part of the connecting rod 22. A meshing component is provided inside the lower part of the movable frame 9. The meshing component includes fixed rods 19 symmetrically installed inside the movable frame 9 and close to both sides of the second motor 10. The lower end faces of the two fixed rods 19 are provided with inclined teeth 21. A traveling gear 16 is fixedly mounted on the upper part of the swing arm 27. The traveling gear 16 and the inclined teeth 21 are meshed and connected. like Figure 3 and Figure 4 As shown, the second motor 10 is a servo motor, and its output shaft is rigidly connected to the connecting rod 22, directly driving the connecting rod 22 to rotate. When the connecting rod 22 rotates, it will drive the swing arm 27 and the traveling gear 16 to rotate, so that the vibrating rod 29 can cover a larger working range and solve the multi-point needs at the intersection of the steel beams.

[0028] A fixing sleeve 31 is fixedly installed on the lower part of the vibrator 29. Mounting rods 26 are installed at equal intervals along the circumference outside the fixing sleeve 31. The ends of multiple mounting rods 26 are connected to a ring disk 32. A high-pressure water pump 35 is installed on the upper surface of the ring disk 32. High-pressure nozzles 36 are installed at equal intervals along the circumference inside the lower part of the ring disk 32. like Figure 6As shown, the high-pressure water pump 35 can deliver high-pressure water from the inlet end to the high-pressure nozzle 36 through the internal flow channel of the ring plate 32. The high-pressure nozzle 36 sprays high-pressure water onto the surface of the vibrating shell 25, thereby removing the attached concrete residue to prevent it from solidifying and affecting the vibration effect, ensuring effective contact between the vibrating shell 25 and the concrete, and maintaining the compaction efficiency.

[0029] Working principle: The pushing mechanism 2 moves to the designated working area on one side of the deep foundation pit support module 1. The frame 5 is fixed by the reinforcement mechanism composed of the fixed seat 3 and the column 6 to ensure the stability of the U-shaped frame 13 and subsequent components. The first motor 7 is started to drive the screw 8 to rotate. The screw 8 and the slide 24 are threaded together, which drives the slide 24 to slide laterally along the inner wall of the U-shaped frame 13. This allows the telescopic shell 14 and the vibrator 29 above the slide 24 to be precisely aligned with the intersection area of ​​the steel beam to be worked on. The hydraulic cylinder 37 extends and retracts, which drives the movable frame 9 to slide up and down along the telescopic shell 14. The vibrator 29 is adjusted to a height flush with the concrete surface. At the same time, the second motor 10 drives the connecting rod 22 to rotate. Under the limiting action of the support rod 18 and the rotating joint 17, the swing rod 27 makes an eccentric motion with the rotating joint 17 as the fulcrum, which drives the lower L-shaped frame 20 and the rectangular frame 15 to make an outer circular motion. The vibrating motor 28 transmits the vibration force to the vibrator 29 and the vibrating shell 25 through the vibrating connecting rod 33. When the vibrating shell 25 comes into contact with the concrete, it generates high-frequency disturbance, which promotes the rearrangement of aggregates, the filling of voids by the slurry, and the elimination of air bubbles and voids. During vibration, the buffer column 30 inside the rectangular frame 15 slides along the inside of the frame, and with the elastic deformation of the spring 34, it absorbs the impact force of vibration, reduces the damage of vibration to the L-shaped frame 20 and the swing rod 27, and extends the service life of the equipment. When the sliding seat 24 is used to compact the concrete, the nuclear density meter 23 monitors the concrete density in real time. When the density reaches the target, the system controls the vibration motor 28 to stop working, and the drive mechanism moves the equipment to the next area; If the density is insufficient, the vibration time will be automatically extended or the vibration frequency will be increased until the density meets the requirements, ensuring the uniformity of concrete density around the steel beam. After completion, the inlet of the high-pressure water pump 35 can be connected to an external pipe. Then, the high-pressure water pump 35 is started, and high-pressure water is sprayed out through the high-pressure nozzle 36 below the ring plate 32 to wash the concrete residue attached to the surface of the vibrating shell 25 and the vibrating rod 29.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A construction structure for the excavated and slab roof of a subway station, comprising a deep foundation pit support module (1) and a pushing mechanism (2), characterized in that: The pushing mechanism (2) is located on one side edge of the deep foundation pit support module (1). The upper end of the pushing mechanism (2) is connected to a frame (5) through a reinforcement mechanism. A U-shaped frame (13) is fixedly installed on the outer wall of one end of the frame (5). A slide (24) is connected inside the U-shaped frame (13) through a driving mechanism. A telescopic shell (14) is fixedly installed on the upper end of the slide (24). A movable frame (9) is slidably installed inside the telescopic shell (14). A connecting rod (22) is connected to one end of the movable frame (9) through a rotating part. A connecting rod (22) is located inside the lower part of the connecting rod (22). A swing arm (27) is inserted through the side rotation. A ring frame (11) is fixedly installed inside the slide (24). A support rod (18) is provided on one side inside the ring frame (11). A rotating joint (17) is embedded inside the support rod (18). The rotating joint (17) passes through the outside of the swing arm (27). An L-shaped frame (20) is fixedly fitted at the lower end of the swing arm (27). A rectangular frame (15) is provided on one side of the L-shaped frame (20). A vibrating rod (29) is connected inside the rectangular frame (15) through a vibration buffer mechanism. A vibrating shell (25) is fixedly installed at the end of the vibrating rod (29).

2. The construction structure for a subway station cut-and-cover roof slab according to claim 1, characterized in that: The reinforcement mechanism includes a fixed seat (3) fixedly installed on the upper surface of the push mechanism (2), and a column (6) is vertically installed on the upper surface of the fixed seat (3). The frame (5) is fixedly sleeved on the outside of the column (6).

3. The construction structure for a subway station cut-and-cover roof slab according to claim 1, characterized in that: The vibration buffer mechanism includes buffer columns (30) symmetrically slidably installed on both sides inside the rectangular frame (15). The ends of the buffer columns (30) that are close to each other are connected to the outside of the vibrating rod (29). A spring (34) is fitted on the outside of the buffer column (30) and inside the rectangular frame (15).

4. The construction structure for a subway station cut-and-cover roof slab according to claim 1, characterized in that: The L-shaped frame (20) has a notch inside, and a vibration connecting rod (33) is inserted inside the notch. A vibration motor (28) is provided at one end of the vibration connecting rod (33), and the vibration motor (28) is fixedly installed on the outer wall of one side of the L-shaped frame (20).

5. The construction structure for a subway station cut-and-cover roof slab according to claim 1, characterized in that: A hydraulic cylinder (37) is provided on the lower end face of the movable frame (9). The bottom of the hydraulic cylinder (37) is fixedly connected to the slide (24). A nuclear density meter (23) is fixedly installed on the lower end face of the slide (24). A power supply box (4) is connected to the upper end face of one side of the pushing mechanism (2) through a fixedly connected support (12).

6. The construction structure for a subway station cut-and-cover roof slab according to claim 1, characterized in that: The rotating component includes a second motor (10) fixedly mounted inside one end of the movable frame (9), the output end of the second motor (10) extending to the lower part of the connecting rod (22), and a meshing component is provided inside the lower part of the movable frame (9).

7. The construction structure for a subway station roof slab according to claim 6, characterized in that: The meshing component includes fixed rods (19) symmetrically installed inside the movable frame (9) and close to both sides of the second motor (10). The lower end faces of the two fixed rods (19) are provided with inclined teeth (21). A traveling gear (16) is fixedly mounted on the upper part of the swing arm (27). The traveling gear (16) and the inclined teeth (21) are meshed and connected.

8. The construction structure for a cut-and-cover roof slab of a subway station according to claim 1, characterized in that: A fixing sleeve (31) is fixedly installed on the lower part of the vibrating rod (29). Mounting rods (26) are installed at equal intervals along the circumferential direction on the outside of the fixing sleeve (31). The ends of multiple mounting rods (26) are connected to a ring disk (32). A high-pressure water pump (35) is installed on the upper surface of the ring disk (32). High-pressure nozzles (36) are installed at equal intervals along the circumferential direction inside the lower part of the ring disk (32).

9. The construction structure for a cut-and-cover roof slab of a subway station according to claim 1, characterized in that: The driving mechanism includes a screw (8) that rotates inside the U-shaped frame (13). One end of the screw (8) is fixedly connected to a first motor (7). The first motor (7) is fixedly installed on the outside of one end of the U-shaped frame (13). The screw (8) is threadedly connected to the slide (24). The outer wall of one end of the slide (24) slides against the inner wall of the U-shaped frame (13).

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