Movable hanger for hoisting bridge wet joint bottom form

Abstract

The application discloses a mobile hanger for hoisting a bridge wet joint bottom mold plate, which has the advantages that vertical guide rods, sliding sleeves, correction guide sleeves, brakes and in-place sensors are additionally arranged, and a rotating limiting and cooperating structure is arranged between the lifting appliance and the correction guide sleeve; when the bottom mold plate is hoisted to the upper part of the lifting appliance and is inserted into the correction guide sleeve, the brake limits the sliding of the sliding sleeve, the correction guide sleeve is fixed, under the rotating action of the rotating limiting and cooperating structure, the lifting appliance rotates to drive the bottom mold plate to rotate, under the limiting action of the rotating limiting and cooperating structure, the length direction of the bottom mold plate is consistent with the extension direction of the wet joint before the bottom mold plate enters the longitudinal gap between adjacent box girders, so that the collision or jamming with the side wall of the box girder is avoided, and after the sliding of the sliding sleeve is released, the winch pulls the lifting appliance to synchronously vertically move the correction guide sleeve, the connecting rod and the sliding sleeve until the two sides of the bottom mold plate are respectively attached to the edges of the same side box girder, and the length direction of the bottom mold plate is consistent with the extension direction of the wet joint in the process, so that manual operation is not needed.

Description

Technical Field

[0001] This invention relates to the field of construction equipment for wet joints between bridge box girders, and particularly to a mobile hoist for hoisting the bottom formwork of wet joints in bridges. Background Technology

[0002] During bridge construction, after the piers and the cap beams above are completed, a row of precast box girders is placed on the cap beams at both ends. Then, concrete needs to be poured in place in the longitudinal gap between every two adjacent box girders to form a wet joint for connection.

[0003] In the process of pouring wet joints, the bottom formwork 201 needs to be installed first. A modified hoisting method is now being adopted. Specifically, workers are positioned as follows: Figure 9 The vertical threaded rod in the center of the bottom formwork 201 is a lifting rod 202. A simple lifting frame is temporarily erected and welded across both sides of the wet joint on the construction site. The base of the simple lifting frame is equipped with longitudinally moving rollers, and a winch is installed on the crossbeam of the simple lifting frame. One group of workers stands above the box girder and lowers the winch rope, while another group of workers on a boat under the bridge screws the lifting device at the bottom end of the rope to the lifting rod 202 on the bottom formwork 201. The winch lifts the bottom formwork 201 to the bottom of the box girder and weds it under the wet joint. The workers above then proceed as follows: Figure 10 As shown, the bottom formwork 201 is suspended and fixed by double suspension beams 204, mountain-shaped buckles 205, and nuts 206. The double suspension beams 204 are placed across the two sides of the wet joint. The mountain-shaped buckles 205 are used to fit the vertical screws 203 on the bottom formwork 201 and the nuts 206 are tightened. The mountain-shaped buckles 205 are hung on the double suspension beams 204 to support the bottom formwork 201, thus achieving a firm support for the bottom formwork 201.

[0004] Here, because the bottom formwork uses a single-stirring structure, it rotates around the stirrup during lifting due to airflow and shifts in the center of gravity, resulting in circumferential turning. Therefore, when the bottom formwork is lifted to the bottom of the box girder, it's difficult to ensure that its length aligns with the direction of the wet joint. To reduce the number of lifting operations, the length of the bottom formwork is typically set to about twice its width, exceeding the maximum width of the longitudinal gap between the box girders. This makes it easy for the corners of the bottom formwork to collide with or get stuck against the inclined walls of the box girder during lifting, and it's also difficult to align with adjacent, already assembled bottom formwork. To overcome these shortcomings, the current method involves workers lying on top of the box girder, holding a long pole that extends through the wet joint to the bottom of the box girder to rotate the bottom formwork. This method is clumsy, the force is difficult to control, and multiple rotations are required to properly align the bottom formwork. It is time-consuming, and there is a safety hazard of the long pole falling and hitting workers on the ship. Improvements are urgently needed. Of course, using two hangers at the front and rear to lift the bottom formwork can avoid rotation. However, the two hangers are heavy and cumbersome to move between the box beams. During the transportation process, the two hangers may fall into the wet joint, which poses a certain safety hazard. Therefore, two workers need to operate at the same time and carefully, which increases labor costs and is inconvenient, time-consuming and labor-intensive. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a mobile hoist for hoisting the bottom formwork of wet joints of bridges, which can automatically correct the circumferential direction of the bottom formwork during the hoisting process in a single-point hoisting mode.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a movable scaffold for hoisting the bottom formwork of wet joints of bridges, comprising a movable support spanning two box girders, a winch for hoisting the bottom formwork mounted on the crossbeam of the movable support, and a hoisting device for connecting the free end of the hoisting rope of the winch to the hoisting rod on the bottom formwork; further comprising a controller, two vertical guide rods fixed under the crossbeam, two sliding sleeves respectively slidingly engaged with the vertical guide rods on the same side, a connecting rod fixed between the sliding sleeves, a straightening guide sleeve fixed on the connecting rod, two brakes respectively for limiting the sliding of the sliding sleeves on the same side, and a brake set on the straightening guide sleeve. A positioning sensor and a brake are electrically connected to the controller. A rotation limit mechanism is provided between the lifting device and the straightening guide sleeve to rotate the bottom template so that the length direction of the bottom template is aligned with the extension direction of the wet joint before entering the gap between the box girders. When the positioning sensor detects that the bottom template is in the corrected position, it sends a signal to the controller. When the controller receives the signal from the positioning sensor, it sends a command to the brake to release the restriction on the sliding sleeve. After the sliding sleeve is released from the sliding restriction, the winch pulls the lifting device to move the straightening guide sleeve, connecting rod and sliding sleeve upward synchronously until both sides of the bottom template are in contact with the edge of the box girder on the same side.

[0007] Compared with the prior art, the advantages of this invention are the addition of two vertical guide rods under the crossbeam of the movable support, two sliding sleeves that slide with the vertical guide rods, a straightening guide sleeve fixed on the connecting rod between the sliding sleeves, two brakes respectively used to limit the sliding of the sliding sleeves on the same side, and a positioning sensor set on the straightening guide sleeve. A rotation limiting fit structure is also provided between the lifting device and the straightening guide sleeve to rotate the bottom formwork, ensuring that the length direction of the bottom formwork is aligned with the extension direction of the wet joint before entering the gap between the box girders. When the bottom formwork is lifted to near the bottom of the box girder, the upper part of the lifting device inserts into the straightening guide sleeve. Because the brakes limit the sliding of the sliding sleeves, the straightening guide sleeve remains stationary. Under the rotational action of the rotation limiting fit structure between the lifting device and the straightening guide sleeve, the lifting device rotates. The bottom formwork rotates, and under the limiting action of the rotation limiting structure, its length direction is aligned with the extension direction of the wet joint before entering the longitudinal gap between adjacent box girders. This prevents the corners of the bottom formwork from colliding with or getting stuck on the side walls of the box girders. When the positioning sensor detects that the bottom formwork is in place, it sends a signal to the controller, triggering the controller to send a command to the brake to release the sliding restriction on the sliding sleeve. After the sliding restriction on the sliding sleeve is released, the winch pulls the lifting device to move the straightening guide sleeve, connecting rod, and sliding sleeve vertically upwards synchronously until both sides of the bottom formwork are in contact with the edge of the box girder on the same side. During this process, the length direction of the bottom formwork is kept aligned with the extension direction of the wet joint, thus enabling the bottom formwork to be automatically and quickly corrected during hoisting without manual adjustment. Moreover, the added vertical guide rods, straightening guide sleeves, and other structures are relatively simple and lightweight. Compared with the two-point hoisting mode using two front and rear hangers, the increase in weight and cost of the additional structures in this application is acceptable.

[0008] The implementation of this scheme is divided into two stages. The first stage uses a rotational limiting mechanism between the lifting device and the straightening guide sleeve to achieve circumferential positioning of the bottom formwork. This triggers the brake to unlock the sliding limit of the sliding sleeve, allowing for the second stage: simultaneously lifting the bottom formwork, lifting device, straightening guide sleeve, connecting rods, etc., so that the bottom formwork rises further to adhere to the bottom surface of the box girder, thus preventing grout leakage during pouring. Ideally, the bottom formwork should rotate and rise simultaneously, precisely adhering to the bottom surface of the box girder upon completion of circumferential positioning. However, in actual construction, the dimensional alignment of various components is rarely so precise. Therefore, this application intentionally positions the straightening guide sleeve lower, creating a time difference. This allows the straightening guide sleeve to first contact and rotate with the bottom formwork lifting device. Only after the bottom formwork is fully circumferentially aligned can the second stage of lifting and adhering to the box girder be performed. This ensures that the final circumferential position of the bottom formwork is correct and unique, and that the bottom formwork is perfectly aligned with the bottom surface of the box girder.

[0009] Preferably, the correction guide sleeve includes a straight cylinder with two spirally rising guide vanes on its inner wall. The two guide vanes are identical in shape and 180 degrees out of phase. The top of each guide vane has a downwardly protruding anti-rotation block, and the positioning sensor is mounted on the anti-rotation block. The lifting device includes a threaded sleeve threaded to the lifting rod and rollers on both sides of the threaded sleeve for sliding against the bottom surface of the guide vanes. The guide vanes, anti-rotation blocks, and rollers constitute the rotation limiting fit structure. The lifting rope passes through the straight cylinder and connects to the top of the threaded sleeve. When the rollers abut against the anti-rotation blocks, the positioning sensor is triggered simultaneously, and the circumferential position of the bottom template is simultaneously corrected. When lifting the lifting device and bottom template, the threaded sleeve and rollers rise into the straight cylinder. The rollers abut against the bottom surface of the guide vane on the same side. As the lifting device rises within the cylinder, it rotates circumferentially along the guide vane until the rollers reach the end of the guide vane, i.e., the anti-rotation stop, triggering the positioning sensor. In other words, regardless of the angle at which the rollers contact the guide vane circumferentially, they will ultimately be circumferentially locked at a unique angle, meaning the length of the bottom template aligns with the final locking direction and the extension direction of the wet joint. This design is simple, easy to manufacture, cost-effective, and provides a stable and reliable guiding effect.

[0010] Preferably, the connecting rod is in the shape of an inverted "V", and the straightening guide sleeve is fixed to the horizontal bar at the bottom of the connecting rod. The design concept is to ensure that the bottom formwork completes circumferential calibration as quickly as possible. Therefore, it is desirable to lower the position of the straightening guide sleeve so that the rollers of the bottom formwork lifting device can contact the straightening guide sleeve earlier. The conventional approach is to make the vertical guide rod longer so that its bottom end extends into the wet joint. However, this would result in the vertical guide rod being too long, getting stuck in the joint, causing instability of the entire hanger, interfering with the movement of the double lifting beams, and requiring the moving hanger to be lifted before it can move on the box girder after the bottom formwork of one wet joint is supported. Therefore, the innovative design of the connecting rod in the shape of an inverted "V" lowers the position of the straightening guide sleeve and effectively controls the length of the vertical guide rod and the overall hanger. The height and stability are improved, avoiding interference with the double lifting beams and hindering the advancement of the lifting frame. After the bottom formwork support of a wet joint is completed, the moving lifting frame moves smoothly on the box girder without instability. In addition, when disconnecting the threaded connection between the lifting device and the lifting rod, it is necessary to further lift the straightening guide sleeve, that is, the connecting rod needs to be moved up a certain distance. However, the upward movement of the straightening guide sleeve will be interfered with by the winch. If the upward movement distance of the straightening guide sleeve is insufficient, the operation of disconnecting the threaded connection between the lifting device and the lifting rod is inconvenient. However, the inverted V-shaped connecting rod can significantly increase the upward movement distance of the straightening guide sleeve, avoid the interference of the winch, and make the operation of disconnecting the threaded connection between the lifting device and the lifting rod smooth.

[0011] As an improvement, a crossbar is connected between the tops of the two vertical rods of the connecting rod; diagonal connecting ribs are provided between the vertical guide rod and the crossbeam. The crossbar is used to strengthen the connecting rod and prevent deformation due to the indirect influence of the winch's traction force, which would increase friction between the sliding sleeve and the vertical guide rod, generating harsh noise. The connecting ribs are used to strengthen the connection between the vertical guide rod and the crossbeam and maintain the verticality of the vertical guide rod. Furthermore, the crossbar and diagonal connecting ribs are deliberately designed to avoid contact with the winch, ensuring that even when the connecting rod is at its upper limit, it will not interfere with or come into contact with the winch.

[0012] Preferably, the brake includes an electromagnet with a limiting block at the end of its spindle. A compression spring is fitted on the spindle to push the limiting block against the vertical guide rod on the same side. The electromagnet is electrically connected to the controller. When the electromagnet receives a command from the controller, it retracts the spindle, separating the limiting block from the vertical guide rod. The electromagnet has a fast reaction speed, which can quickly release the sliding restriction on the sleeve, preventing damage caused by the winch running idle or deformation of the crossbar of the connecting rod. Under normal conditions, the process of locking the vertical guide rod is also stable and secure, preventing premature misalignment of the vertical guide rod and the straightening guide sleeve. Attached Figure Description

[0013] Figure 1 This is a partial schematic diagram showing the length direction of the bottom formwork perpendicular to the extension direction of the wet joint during the hoisting process.

[0014] Figure 2 This is a partial schematic diagram showing the length direction of the bottom formwork aligned with the extension direction of the wet joint after it has been corrected before entering the gap between the box girders during the hoisting process.

[0015] Figure 3 This is a partial schematic diagram showing the bottom formwork being hoisted up to the point where it is attached to the edges of the box girder on both sides.

[0016] Figure 4 This is a three-dimensional schematic diagram of the movable hanger in Example 1.

[0017] Figure 5 A three-dimensional schematic diagram of the movable gantry in Example 1 for completing the hoisting construction.

[0018] Figure 6 A three-dimensional schematic diagram of the movable gantry in Example 2 for completing the hoisting construction.

[0019] Figure 7 This is an exploded schematic diagram of the lifting device, the straightening guide sleeve, and the rotational limiting fit between them.

[0020] Figure 8 This is a bottom-view perspective view of the lifting device, the straightening guide sleeve, and the rotational limiting mechanism between them.

[0021] Figure 9 This is a three-dimensional schematic diagram of the base template.

[0022] Figure 10 This is a three-dimensional schematic diagram of the bottom template receiving support.

[0023] As shown in the figure: 1. Movable support, 1-1. Crossbeam, 1-2. Vertical guide rod, 1-3. Limiting nut, 1-4. Diagonal connecting rib;

[0024] 2. Winch; 2-1. Lifting rope;

[0025] 3. Lifting tool; 3-1. Threaded sleeve; 3-1-1. Threaded hole; 3-2. Axle; 3-3. Roller;

[0026] 4. Position sensor;

[0027] 11. Sliding sleeve; 12. Connecting rod; 13. Correcting guide sleeve; 13-1. Straight cylinder; 13-2. Guide slide; 13-3. Anti-rotation block; 13-4. Guide rope ring; 14. Brake; 15. Crossbar.

[0028] 101. Box girder; 102. Cap beam; 103. Pier.

[0029] 201. Bottom formwork; 202. Hanging rod; 203. Vertical threaded rod; 204. Double hanging beam; 205. Mountain-shaped fastener; 206. Nut. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0031] This preferred embodiment is, for example Figures 1 to 5The diagram shows a movable support frame for hoisting the bottom formwork of a wet joint in a bridge. It includes a movable support 1 spanning two box girders 101. A winch 2 for hoisting the bottom formwork 201 is mounted on the crossbeam 1-1 of the movable support 1. The free end of the hoisting rope 2-1 of the winch 2 is connected to a lifting device 3 for connecting to the lifting rods 202 on the bottom formwork 201. The frame also includes a controller (not shown), two vertical guide rods 1-2 fixed under the crossbeam 1-1, two sliding sleeves 11 that slide with the vertical guide rods 1-2 on the same side, a vertical straightening guide sleeve 13 fixed on a connecting rod 12 between the sliding sleeves 11, brakes 14 for limiting the sliding of the sliding sleeves 11 on the same side, and a positioning sensor 4 mounted on the straightening guide sleeve 13. Limit nuts 1-3 are screwed to the bottom ends of the vertical guide rods 1-2. The winch 2... Position sensor 4 and brake 14 are electrically connected to the controller. The lifting device 3 and the straightening guide sleeve 13 are equipped with a rotation limit mechanism to rotate the bottom template 201, ensuring that the length direction of the bottom template 201 is aligned with the wet joint extension direction before entering the longitudinal gap between the box girders 101, and maintaining this alignment until the bottom template 201 rises to contact the edge of the box girders 101. When the position sensor 4 detects that the bottom template 201 is in position and has been straightened, it sends a signal to the controller. Upon receiving the signal from the position sensor 4, the controller sends a command to the brake 14 to release the restriction on the sliding sleeve 11. After the sliding sleeve 11 is released from its sliding restriction, the winch 2 pulls the lifting device 3, causing the straightening guide sleeve 13, connecting rod 12, and sliding sleeve 11 to move vertically upwards synchronously until both sides of the top surface of the bottom template 201 abut against the bottom surface of the edge of the box girders 101 on the same side. In this embodiment, the controller can be installed inside an electrical control box, which can be fixed to a movable base at the bottom of the movable support 1.

[0032] like Figure 7 and 8As shown, the straightening guide sleeve 13 includes a straight cylinder 13-1. The upper end of the straight cylinder 13-1 is connected to a guide rope ring 13-1-1 in the middle by four ribs. The bottom end of the straight cylinder 13-1 is provided with an inner chamfer for guiding. The inner wall of the straight cylinder 13-1 is provided with two spirally rising guide vanes 13-2. The rotation angle of the guide vanes 13-2 is slightly less than that of a semicircle. The two guide vanes are the same shape and are 180 degrees out of phase. A downwardly protruding anti-rotation block 13-3 is provided at the top of the guide vane 13-2. The position sensor 4 is provided on the anti-rotation block 13-3. The position sensor 4 is a touch sensor or a touch switch, or an infrared sensor, etc. The lifting device 3 includes a threaded sleeve 3-1 and rollers 3-3 on the axles 3-2 on both sides. The rollers 3-3 are symmetrically arranged. The threaded sleeve 3-1 has a threaded hole 3-1-1 in the middle for threaded connection with the lifting rod 202. The threaded hole 3-1-1 is a blind hole, that is, the lifting rod 202 and the lifting device 3 adopt the original threaded connection relationship without changing the shape of the existing lifting rod 202, so as to avoid increasing costs. Of course, other detachable connection methods such as snap-fit ​​can also be used, but the structure of the upper end of the lifting rod 202 needs to be adapted. For example, the upper end is square, and two or four snap-fit ​​pieces are added around the perimeter. The hoisting rope 2-1 passes through the guide rope ring 13-1-1 and connects to the top of the threaded sleeve 3-1. The hoisting rope 2-1 and the top of the threaded sleeve 3-1 can be fixed by binding, riveting, or welding. The guide rope ring 13-1-1 limits the swaying range of the hoisting rope 2-1 and prevents the hoisting rope 2-1 from swaying due to changes in the position of the rope exiting the winch 2, which would cause the bottom template 201 to swing significantly. The guide slide 13-2 and the anti-rotation block 13-3, together with the roller 3-3, form the aforementioned rotation limiting cooperation structure. The roller 3-3 slides against the bottom surface of the guide slide 13-2. When the roller 3-3 abuts against the anti-rotation block 13-3, the position sensor 4 is triggered simultaneously and the circumferential position of the bottom template 201 is corrected to the correct position. Here, multiple reinforcing ribs can be welded between the upper end face of the guide slide 13-2 and the inner wall of the straight cylinder 13-1 to prevent the guide slide 13-2 from being stretched and deformed; reinforcing ribs can also be provided between the wheel axle 3-2 of the roller 3-3 and the threaded sleeve 3-1 to increase the connection strength.

[0033] As an improvement, the connecting rod 12 is designed in an inverted "V" shape, with the bottom horizontal bar of the connecting rod 12 in the wet joint, and the straightening guide sleeve 13 fixed to the bottom horizontal bar of the connecting rod 12. After the bottom formwork of one wet joint is hoisted, the movable gantry needs to be transferred to another wet joint. If the vertical guide rod 1-2 is too long and its bottom extends into the wet joint, the movable gantry needs to be raised to a certain height on the box girder 101 before it can move, which is inconvenient and may also interfere with the double lifting beam 204, hindering the movement of the movable gantry. However, the "V" shape design of the connecting rod 12 allows the length of the vertical guide rod 1-2 to be less than the height of the movable gantry. Before the movable gantry moves, the sliding restriction of the brake 14 on the sliding sleeve 11 can be manually released, and the connecting rod 12 can be moved upward so that its bottom horizontal bar is higher than the upper surface of the box girder 101, allowing the movable gantry to move normally on the box girder 101.

[0034] The brake 14 includes an electromagnet with a limiting block at the end of its spindle. A compression spring is fitted on the spindle to push the limiting block against the vertical guide rod on the same side. The electromagnet is electrically connected to the controller. When the electromagnet receives a command from the controller, it retracts its spindle to separate the limiting block from the vertical guide rod 1-2. Alternatively, the electromagnet body can be fixed to a sliding sleeve 11. The sliding sleeve 11 can have a protruding stop opposite the limiting block to prevent the vertical guide rod 1-2 from deforming under force. Example 2

[0035] This preferred embodiment is as follows: Figure 6 The mobile hoist shown is used for hoisting the bottom formwork of wet joints of bridges. The other structures are the same as those in Embodiment 1, except that: a crossbar 15 is connected between the middle of the two vertical rods of the connecting rod 12 to strengthen the strength of the connecting rod and prevent the bottom crossbar of the connecting rod 12 from deforming due to the tension generated by the winch 2 traction device 3 on the straightening guide sleeve 13 on the crossbar, which would increase the friction between the sliding sleeve 11 and the vertical guide rod 1-2 and produce a harsh noise during the sliding of the sliding sleeve 11; diagonal connecting ribs 1-4 are provided between the vertical guide rod 1-2 and the crossbeam 1-1 to strengthen the connection strength between the vertical guide rod 1-2 and the crossbeam 1-1 and to maintain the verticality of the vertical guide rod 1-2.

Claims

1. A movable scaffold for hoisting the bottom formwork of a wet joint in a bridge, comprising a movable support (1) spanning two box girders (101), a winch (2) for hoisting the bottom formwork (201) mounted on the crossbeam (1-1) of the movable support (1), and a lifting device (3) for connecting to the lifting rod (202) on the bottom formwork (201) at the free end of the hoisting rope (2-1) of the winch (2), characterized in that, It also includes a controller, two vertical guide rods (1-2) fixed under the crossbeam (1-1), two sliding sleeves (11) that slide in cooperation with the vertical guide rods (1-2) on the same side, a connecting rod (12) fixed between the sliding sleeves (11), a straightening guide sleeve (13) fixed on the connecting rod (12), two brakes (14) for limiting the sliding of the sliding sleeves (11) on the same side, and a positioning sensor (4) set on the straightening guide sleeve (13). The positioning sensor (4) and the brakes (14) are electrically connected to the controller. The lifting device (3) and the straightening guide sleeve (13) are provided with a rotation limit cooperation structure for rotating the bottom template (201). Before the bottom template (201) enters the longitudinal gap between the box girder (101), the length direction of the bottom template (201) is consistent with the extension direction of the wet joint; when the positioning sensor (4) detects that the bottom template (201) is in the corrected position, it sends a signal to the controller. When the controller receives the signal from the positioning sensor (4), it sends a command to the brake (14) to release the restriction on the sliding sleeve (11); after the sliding sleeve (11) is released from the sliding restriction, the winch (2) pulls the lifting device (3) to drive the straightening guide sleeve (13), connecting rod (12) and sliding sleeve (11) to move vertically upward synchronously until the two sides of the bottom template (201) are in contact with the edge of the box girder (101) on the same side; The corrective guide sleeve (13) includes a straight cylinder (13-1), and two spirally rising guide vanes (13-2) are provided on the inner wall of the straight cylinder (13-1). The two guide vanes (13-2) are identical in shape and 180 degrees out of phase. The top of the guide vane (13-2) is provided with a downwardly protruding anti-rotation block (13-3). The positioning sensor (4) is set on the anti-rotation block (13-3). The lifting device (3) includes a threaded sleeve (3-1) that is threadedly connected to the lifting rod (202) and a device for setting up... Rollers (3-3) on both sides of the threaded sleeve (3-1) are used to slide against the bottom surface of the guide slide (13-2); the guide slide (13-2) and the anti-rotation block (13-3) together with the rollers (3-3) constitute the rotation limit fit structure; the suspension rope (2-1) passes through the straight cylinder (13-1) and connects to the threaded sleeve (3-1); when the rollers (3-3) abut against the anti-rotation block (13-3), the position sensor (4) is triggered synchronously and the circumferential position of the bottom template is synchronously corrected to the position.

2. The movable scaffold for hoisting the bottom formwork of wet joints in bridges according to claim 1, characterized in that: The connecting rod (12) is in the shape of an inverted "V", and the corrective guide sleeve (13) is fixed on the crossbar at the bottom of the connecting rod (12).

3. The movable scaffold for hoisting the bottom formwork of wet joints in bridges according to claim 1, characterized in that: A crossbar (15) is connected between the top ends of the two vertical rods of the connecting rod (12); a diagonal connecting rib (1-4) is provided between the vertical guide rod (1-2) and the crossbeam (1-1).

4. The movable scaffold for hoisting the bottom formwork of wet joints in bridges according to claim 1, characterized in that: The brake (14) includes an electromagnet, with a limiting block at the end of the electromagnet spindle. A compression spring is fitted on the spindle to push the limiting block against the vertical guide rod on the same side. The electromagnet is electrically connected to the controller. When the electromagnet receives a command from the controller, it retracts the spindle to separate the limiting block from the vertical guide rod (1-2).

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