A construction method for dismantling a support of a large-span prestressed cast-in-situ box girder

Abstract

The application discloses a large-span prestressed cast-in-situ box girder support dismantling construction method, and particularly relates to the cast-in-situ box girder field, which comprises four adjusting assemblies, the bottom of the four adjusting assemblies is fixedly connected with a traction assembly, the upper surface of the traction assembly is provided with a supporting assembly, the outer side wall of the adjusting assembly is provided with a monitoring assembly, and the four adjusting assemblies are symmetrically located in front of and behind the traction assembly. The four brackets are fixed on the surface of the cast-in-situ box girder body, the adjusting disc is rotated, the position of the supporting assembly is adjusted, the supporting frame is connected with the positioning column, then the traction rope is sequentially threaded through the supporting disc, the supporting ring, the limiting pulley, the limiting hole and the circular ring, the traction rope is slowly released through the winch, at this time, the support body slowly moves downwards under the action of gravity, the traction rope is integrated on one winch through the supporting assembly, and the four traction ropes can be synchronously retracted and released, so that the horizontal position of the support body during dismantling is ensured.

Description

Technical Field

[0001] This invention relates to the field of cast-in-place box girder technology, and more specifically, to a construction method for dismantling supports for large-span prestressed cast-in-place box girders. Background Technology

[0002] Chinese patent discloses a device for dismantling cast-in-place box girder supports. The patent application number is 2022201137143. The disclosed content is as follows: By designing a positioning mechanism, the positioning of the convex ring during movement is increased, so that the moving block is positioned when it moves; when the winding frame is installed, the slider at the bottom of the winding frame is inserted into the groove opened at the top of the base to increase the positioning of the winding frame during installation. After the winding frame is inserted, the threaded rod is rotated and screwed into the slot opened at the top of the winding frame, so as to achieve a stable installation of the winding frame.

[0003] However, both the aforementioned support dismantling equipment and the support dismantling equipment currently on the market have the following problems: when dismantling the support, multiple winding or hoisting equipment are required to lift and dismantle the support. Therefore, the support may tilt during hoisting, which poses certain safety hazards.

[0004] To address these issues, we propose a construction method for dismantling supports for large-span prestressed cast-in-place box girders. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide a method for dismantling a support structure for a large-span prestressed cast-in-place box girder. The method involves slowly releasing the traction ropes using a winch, allowing the support structure to move slowly downwards under gravity. By integrating the traction ropes onto a single winch using a support assembly, the method enables the simultaneous release and retraction of four traction ropes, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for dismantling a support frame for a large-span prestressed cast-in-place box girder, comprising four adjusting components, a traction component fixedly connected to the bottom of the four adjusting components, a support component installed on the upper surface of the traction component, a monitoring component installed on the outer side wall of the adjusting components, the four adjusting components symmetrically located in front of and behind the traction component, and the support component located directly above the traction component. Each adjusting component includes a bracket, a positioning column, a limiting hole, four connecting frames, a sliding seat, a lead screw, and a drive motor. The system comprises two limiting rods, an adjusting seat, and a pull ring. The sliding seat is slidably connected to the inner side wall of the adjusting seat and to the outer side wall of the two limiting rods. The sliding seat is threadedly connected to the outer side wall of the lead screw. One end of the lead screw is fixedly connected to the output shaft of the drive motor. The pull ring is fixedly connected to the lower surface of the adjusting seat. The positioning pin is fixedly connected to the upper surface of the bracket. The limiting hole is opened on the upper surface of the bracket. The support assembly includes a support plate, four sliding grooves, four support frames, a support ring, four limiting pulleys, a slider, a threaded rod, a rotating seat, and two guide rods.

[0007] The four grooves are symmetrically opened on the upper surface of the support plate, the four limiting pulleys are symmetrically installed inside the support ring, the rotating seat is fixedly connected to the upper surface of the support frame, the slider is slidably connected to the outer side wall of the two guide rods, and the slider is slidably connected to the outer side wall of the threaded rod.

[0008] The traction assembly includes a winch, a support body, a traction rope, a cast-in-place box girder body, four traction sleeves, and a ring;

[0009] The winch is installed at the center of the upper surface of the cast-in-place box girder body. The four traction sleeves are symmetrically sleeved on the outer side wall of the support body. The ring is fastened to the traction sleeve. One end of the traction rope is fixedly connected to the outer side wall of the winch shaft, and the other end of the traction rope is fixedly connected to the pull ring.

[0010] The traction rope passes sequentially through the ring, the limiting hole, the limiting pulley, the support ring, and the support plate. The four brackets are symmetrically and fixedly connected to the upper surface of the cast-in-place box girder body, and the winch is located directly below the support plate.

[0011] In a preferred embodiment, the drive motor is mounted on the front surface of the adjusting seat, the front end of the limiting rod is fixedly connected to the inner front wall of the adjusting seat, the rear end of the limiting rod is fixedly connected to the front surface of the bracket, the rear end of the lead screw is rotatably connected to the inner rear wall of the adjusting seat, the front ends of the four connecting brackets are symmetrically fixedly connected to the outer side wall of the sliding seat, the rear ends of the four connecting brackets are symmetrically fixedly connected to the outer side wall of the bracket, and the adjusting seat is slidably connected to the outer side wall of the two limiting rods.

[0012] In a preferred embodiment, the monitoring components include a mounting bracket, a ranging sensor, a controller, and an audible and visual alarm.

[0013] The mounting bracket is fixedly connected to the lower surface of the bracket, the ranging sensor is mounted on the lower surface of the mounting bracket, the controller is mounted on one side of a bracket, and the audible and visual alarm is mounted on the upper surface of the bracket.

[0014] In a preferred embodiment, the two ends of the guide rod are symmetrically fixedly connected to both sides of the inner wall of the slide groove, one end of the threaded rod is rotatably connected to one side of the inner wall of the slide groove, the threaded rod is rotatably connected to the inside of the support plate, and the other end of the threaded rod is fixedly connected to an adjusting plate.

[0015] In a preferred embodiment, the upper surface of the rotating seat is rotatably connected to the lower surface of the slider, the support ring is rotatably connected to the upper surface of the support disk, the support ring and the support disk are coaxially arranged, and the support frame has a positioning hole inside.

[0016] In a preferred embodiment, the four support frames are symmetrically located above the main body of the cast-in-place box girder, the positioning column is slidably connected to the inner wall of the positioning hole, and the support frame is fixedly connected to the positioning column by a nut.

[0017] By adopting the above technical solution.

[0018] The technical effects and advantages of this invention are as follows:

[0019] I. This invention fixes four brackets to the surface of the cast-in-place box girder body, rotates the adjustment disc to adjust the position of the support components so that the support frame is connected with the positioning column, and then the traction rope passes through the support disc, support ring, limit pulley, limit hole and ring in sequence. The traction rope is slowly released by the winch. At this time, the support body moves slowly downward under the action of gravity. The traction rope is integrated into a winch by the support components, so that the four traction ropes can be wound and released synchronously to ensure the horizontality of the support body when it is disassembled.

[0020] Second, this invention uses four distance sensors to monitor the distance between the bracket and the main support body. When a significant difference occurs in the distance, an audible and visual alarm is triggered at the corresponding position. At this time, the drive motor at that position drives the lead screw to rotate. Under the action of the lead screw, sliding seat, and limit rod, the adjusting seat is displaced. The adjusting seat pulls the traction rope through the pull ring, which can adjust the height at that position, thereby keeping the main support body moving horizontally downward and ensuring safety during construction. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a construction method for dismantling supports for large-span prestressed cast-in-place box girders.

[0022] Figure 2 This is a schematic diagram showing the connection between the adjustment component and the monitoring component of the present invention.

[0023] Figure 3 This is a schematic diagram of the adjustment component structure of the present invention.

[0024] Figure 4 This is a schematic diagram of the monitoring component structure of the present invention.

[0025] Figure 5 This is a schematic diagram of the support component structure of the present invention.

[0026] Figure 6 This is a schematic diagram of the support frame structure of the present invention.

[0027] The attached figures are labeled as follows: 101, Adjustment component; 11, Bracket; 12, Positioning column; 14, Limiting hole; 15, Connecting frame; 16, Sliding seat; 17, Lead screw; 18, Drive motor; 19, Limiting rod; 20, Adjustment seat; 21, Pull ring; 301, Monitoring component; 31, Mounting frame; 32, Distance sensor; 33, Controller; 34, Audible and visual alarm; 401, Support component; 41, Support plate; 42, Slide groove; 43, Adjustment plate; 44, Support frame; 45, Positioning hole; 46, Support ring; 47, Limiting pulley; 48, Sliding block; 49, Threaded rod; 50, Rotating seat; 51, Guide rod; 601, Traction component; 61, Winch; 62, Support body; 63, Traction rope; 64, Cast-in-place box girder body; 65, Traction sleeve; 66, Circular ring. Detailed Implementation

[0028] 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 some embodiments of the present invention, and not all embodiments. 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.

[0029] Example 1

[0030] Refer to the instruction manual appendix Figure 1-6 The present invention provides a method for dismantling a support frame for a large-span prestressed cast-in-place box girder, comprising four adjustment components 101. The bottom of the four adjustment components 101 is fixedly connected to a traction component 601. A support component 401 is installed on the upper surface of the traction component 601. A monitoring component 301 is installed on the outer side wall of the adjustment components 101. The four adjustment components 101 are symmetrically located in front of and behind the traction component 601, and the support component 401 is located directly above the traction component 601.

[0031] like Figure 1-4As shown, the adjustment assembly 101 includes a bracket 11, a positioning post 12, a limiting hole 14, four connecting brackets 15, a sliding seat 16, a lead screw 17, a drive motor 18, two limiting rods 19, an adjustment seat 20, and a pull ring 21.

[0032] The sliding seat 16 is slidably connected to the inner wall of the adjusting seat 20, and slidably connected to the outer walls of the two limiting rods 19. The sliding seat 16 is threadedly connected to the outer wall of the lead screw 17. One end of the lead screw 17 is fixedly connected to the output shaft of the drive motor 18. The pull ring 21 is fixedly connected to the lower surface of the adjusting seat 20. The positioning pin 12 is fixedly connected to the upper surface of the bracket 11. The limiting hole 14 is opened on the upper surface of the bracket 11. The drive motor 18 is mounted on the front surface of the adjusting seat 20. The front end of the limiting rod 19 is fixedly connected to the inner front wall of the adjusting seat 20, and the rear end of the limiting rod 19 is fixedly connected to the inner front wall of the adjusting seat 20. The rear end of the lead screw 17 is rotatably connected to the inner rear wall of the adjusting seat 20, which is connected to the front surface of the bracket 11. The front ends of the four connecting brackets 15 are symmetrically fixed to the outer side wall of the sliding seat 16, and the rear ends of the four connecting brackets 15 are symmetrically fixed to the outer side wall of the bracket 11. The adjusting seat 20 is slidably connected to the outer side wall of the two limiting rods 19. The lead screw 17 is driven to rotate by the drive motor 18. Under the action of the lead screw 17, the sliding seat 16, and the limiting rods 19, the adjusting seat 20 is displaced. The adjusting seat 20 pulls the traction rope 63 through the pull ring 21, which can adjust the height of the position.

[0033] like Figure 2-4 As shown, the monitoring component 301 includes a mounting bracket 31, a ranging sensor 32, a controller 33, and an audible and visual alarm 34;

[0034] Mounting bracket 31 is fixedly connected to the lower surface of bracket 11. Distance sensor 32 is mounted on the lower surface of mounting bracket 31. Controller 33 is mounted on one side of bracket 11. Audible and visual alarm 34 is mounted on the upper surface of bracket 11. The four distance sensors 32 monitor the distance between bracket 11 and support body 62. When a large difference in distance occurs, the audible and visual alarm 34 at the corresponding position will sound an alarm, thereby realizing online monitoring.

[0035] Example 2

[0036] Please see Figure 1 , 5 The difference between Example 6 and Example 1 is as follows:

[0037] like Figure 5-6 As shown, the support assembly 401 includes a support plate 41, four slide grooves 42, four support frames 44, a support ring 46, four limiting pulleys 47, a slider 48, a threaded rod 49, a rotating seat 50, and two guide rods 51.

[0038] Four grooves 42 are symmetrically formed on the upper surface of the support plate 41. Four limiting pulleys 47 are symmetrically installed inside the support ring 46. The rotating seat 50 is fixedly connected to the upper surface of the support frame 44. The slider 48 is slidably connected to the outer side wall of the two guide rods 51 and the outer side wall of the threaded rod 49. The two ends of the guide rods 51 are symmetrically fixedly connected to the inner sides of the grooves 42. One end of the threaded rod 49 is rotatably connected to one side of the inner wall of the groove 42 and rotatably connected to the inside of the support plate 41. The other end of the threaded rod 49 is fixed. The upper surface of the rotating seat 50 is rotatably connected to the lower surface of the slider 48, and the support ring 46 is rotatably connected to the upper surface of the support plate 41. The support ring 46 and the support plate 41 are coaxially arranged. The support frame 44 has a positioning hole 45 inside. By rotating the adjusting plate 43, the adjusting plate 43 drives the threaded rod 49 to rotate. The threaded rod 49 drives the slider 48 through the thread. The slider 48 drives the support frame 44 through the rotating seat 50. The position of the support frame 44 can be adjusted so that the support frame 44 can be docked with the positioning column 12.

[0039] like Figure 1 As shown, the traction assembly 601 includes a winch 61, a support body 62, a traction rope 63, a cast-in-place box girder body 64, four traction sleeves 65, and a ring 66;

[0040] A winch 61 is installed at the center of the upper surface of the cast-in-place box girder body 64. Four traction sleeves 65 are symmetrically fitted onto the outer side wall of the support body 62. A ring 66 is fastened to the traction sleeve 65. One end of the traction rope 63 is fixedly connected to the outer side wall of the winch 61 shaft, and the other end of the traction rope 63 is fixedly connected to the pull ring 21. The traction rope 63 passes sequentially through the ring 66, the limiting hole 14, the limiting pulley 47, the support ring 46, and the support plate 41. Four brackets 11 are symmetrically fixedly connected to the upper surface of the cast-in-place box girder body 64. The winch... The machine 61 is located directly below the support plate 41, and four support frames 44 are symmetrically located above the cast-in-place box girder body 64. The positioning column 12 is slidably connected to the inner wall of the positioning hole 45. The support frame 44 is fixedly connected to the positioning column 12 by nuts. The traction rope 63 is pre-tensioned by the winch 61, the support steel pipe under the support body 62 is removed, and then the traction rope 63 is slowly released by the winch 61. At this time, the support body 62 moves slowly downward under the action of gravity, which can realize the dismantling of the support body 62.

[0041] In this invention, the model of the ranging sensor 32 is GM30; the model of the controller 33 is OHR-PR10. The signal transmitting end of the ranging sensor 32 is connected to the signal receiving end of the controller 33. The electrical output end of the controller 33 is electrically connected to the electrical input end of the audible and visual alarm 34 and the drive motor 18 through a relay.

[0042] The working principle of this invention is as follows: Four brackets 11 are fixed on the upper surface of the cast-in-place box girder body 64. Then, the positioning holes 45 in the support frame 44 are connected with the positioning columns 12. By rotating the adjusting plate 43, the adjusting plate 43 drives the threaded rod 49 to rotate. The threaded rod 49 drives the slider 48 through the thread. The slider 48 drives the support frame 44 through the rotating seat 50. The position of the support frame 44 can be adjusted so that the support frame 44 can be connected with the positioning columns 12. The support frame 44 and the positioning columns 12 are fixedly connected with nuts. The winch 61 is installed on the upper surface of the cast-in-place box girder body 64. The position of the winch 61 corresponds to the position of the support plate 41. Four traction sleeves 65 are symmetrically sleeved on the outside of the support body 62. Then, the traction rope 63 passes through the support plate 41, the support ring 46, the limiting pulley 47, the limiting hole 14 and the ring 66 in sequence. The traction rope 63 is fixedly connected to the pull ring 21, and then the traction rope 63 is pre-tensioned by the winch 61. The supporting steel pipe under the bracket body 62 is removed, and then the traction rope 63 is slowly released by the winch 61. At this time, the bracket body 62 moves slowly downward under the action of gravity. During the movement, four distance sensors 32 monitor the distance between the bracket 11 and the bracket body 62. When the distance is significantly different, the audible and visual alarm 34 at the corresponding position will sound an alarm. At this time, the drive motor 18 at that position drives the lead screw 17 to rotate. Under the action of the lead screw 17, the sliding seat 16, and the limit rod 19, the adjusting seat 20 is displaced. The adjusting seat 20 pulls the traction rope 63 through the pull ring 21, which can adjust the height of the position, thereby keeping the bracket body 62 moving horizontally downward, and realizing the dismantling of the bracket body 62.

Claims

1. A method for dismantling supports for large-span prestressed cast-in-place box girders, comprising four adjusting components (101), characterized in that: The bottom of the four adjustment components (101) is fixedly connected to a traction component (601). A support component (401) is installed on the upper surface of the traction component (601). A monitoring component (301) is installed on the outer side wall of the adjustment component (101). The four adjustment components (101) are symmetrically located in front of and behind the traction component (601). The support component (401) is located directly above the traction component (601). The adjustment component (101) includes a bracket (11), a positioning post (12), a limiting hole (14), four connecting brackets (15), a sliding seat (16), a lead screw (17), a drive motor (18), two limiting rods (19), an adjustment seat (20), and a pull ring (21). The sliding seat (16) is slidably connected to the... The inner wall of the adjusting seat (20), the sliding seat (16) is slidably connected to the outer wall of the two limiting rods (19), the sliding seat (16) is threadedly connected to the outer wall of the lead screw (17), one end of the lead screw (17) is fixedly connected to the output shaft of the drive motor (18), the pull ring (21) is fixedly connected to the lower surface of the adjusting seat (20), the positioning column (12) is fixedly connected to the upper surface of the bracket (11), the limiting hole (14) is opened on the upper surface of the bracket (11), the support assembly (401) includes a support plate (41), four sliding grooves (42), four support frames (44), a support ring (46), four limiting pulleys (47), a slider (48), a threaded rod (49), a rotating seat (50) and two guide rods (51). Four grooves (42) are symmetrically opened on the upper surface of the support plate (41), four limiting pulleys (47) are symmetrically installed inside the support ring (46), the rotating seat (50) is fixedly connected to the upper surface of the support frame (44), the slider (48) is slidably connected to the outer side wall of the two guide rods (51), and the slider (48) is slidably connected to the outer side wall of the threaded rod (49). The traction assembly (601) includes a winch (61), a support body (62), a traction rope (63), a cast-in-place box girder body (64), four traction sleeves (65) and a ring (66). The winch (61) is installed at the center of the upper surface of the cast-in-place box girder body (64). The four traction sleeves (65) are symmetrically sleeved on the outer side wall of the support body (62). The ring (66) is fastened to the traction sleeve (65). One end of the traction rope (63) is fixedly connected to the outer side wall of the winch (61) shaft. The other end of the traction rope (63) is fixedly connected to the pull ring (21). The traction rope (63) passes through the ring (66), the limiting hole (14), the limiting pulley (47), the support ring (46) and the support plate (41) in sequence. The four brackets (11) are symmetrically fixed to the upper surface of the cast-in-place box girder body (64). The winch (61) is located directly below the support plate (41). The two ends of the guide rod (51) are symmetrically fixed to both sides of the inner wall of the slide groove (42), one end of the threaded rod (49) is rotatably connected to one side of the inner wall of the slide groove (42), the threaded rod (49) is rotatably connected to the inside of the support plate (41), and the other end of the threaded rod (49) is fixedly connected to the adjustment plate (43). Four brackets are fixed to the surface of the cast-in-place box girder. The position of the support components is adjusted by rotating the adjustment disc so that the support frame is connected with the positioning column. Then, the traction rope is passed through the support plate, support ring, limit pulley, limit hole and ring in sequence. The traction rope is slowly released by the winch. At this time, the main body of the support moves slowly downward under the action of gravity. The traction rope is integrated into a winch by the support components, so that the four traction ropes can be wound and released at the same time to ensure the horizontality of the main body of the support when it is disassembled.

2. The method for dismantling a support structure for a large-span prestressed cast-in-place box girder according to claim 1, characterized in that: The drive motor (18) is mounted on the front surface of the adjusting seat (20). The front end of the limiting rod (19) is fixedly connected to the inner front wall of the adjusting seat (20). The rear end of the limiting rod (19) is fixedly connected to the front surface of the bracket (11). The rear end of the lead screw (17) is rotatably connected to the inner rear wall of the adjusting seat (20). The front ends of the four connecting frames (15) are symmetrically fixedly connected to the outer side wall of the sliding seat (16). The rear ends of the four connecting frames (15) are symmetrically fixedly connected to the outer side wall of the bracket (11). The adjusting seat (20) is slidably connected to the outer side wall of the two limiting rods (19).

3. The method for dismantling a support structure for a large-span prestressed cast-in-place box girder according to claim 1, characterized in that: The monitoring component (301) includes a mounting bracket (31), a ranging sensor (32), a controller (33), and an audible and visual alarm (34). The mounting bracket (31) is fixedly connected to the lower surface of the bracket (11), the distance sensor (32) is installed on the lower surface of the mounting bracket (31), the controller (33) is installed on one side of a bracket (11), and the audible and visual alarm (34) is installed on the upper surface of the bracket (11).

4. The method for dismantling a support structure for a large-span prestressed cast-in-place box girder according to claim 1, characterized in that: The upper surface of the rotating seat (50) is rotatably connected to the lower surface of the slider (48), the support ring (46) is rotatably connected to the upper surface of the support disk (41), the support ring (46) and the support disk (41) are coaxially arranged, and the support frame (44) has a positioning hole (45) inside.

5. A construction method for dismantling supports for large-span prestressed cast-in-place box girders according to claim 4, characterized in that: The four support frames (44) are symmetrically located above the cast-in-place box girder body (64). The positioning column (12) is slidably connected to the inner wall of the positioning hole (45). The support frame (44) is fixedly connected to the positioning column (12) by a nut.

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