Jig frame for binding box girder steel bars

Abstract

The utility model relates to the field of railway box girder steel bar binding, in particular to a jig frame for box girder steel bar binding, which comprises an outer frame and an inner frame, the outer frame is provided with a plurality of sleeves, the sleeves are detachably connected with supporting legs, and the supporting legs are provided with pulley pieces; the inner frame comprises a sliding frame and a plurality of lifting platforms, the sliding frame abuts against the pulley pieces, the sliding frame can move in the rolling direction of the pulley pieces, the lifting platforms are arranged on the sliding frame, and reinforcing steel bars are bound on the lifting platforms; the problem that a jig frame cannot be shared due to the fact that different beam type inner boxes are different in height is solved through the lifting platform; the sliding frame is in rolling connection with the pulley pieces, so that the problem that beam-type inner frames with different spans cannot be shared is solved; the sliding frame on the inner frame can slide relative to the outer frame, so that the flexibility is enhanced, and the labor force and the cost are reduced; the tool has the advantages of being simple in structure, flexible to use, high in tool utilization rate, convenient to operate and high in safety.

Description

A type of jig for binding the reinforcing bars of box girders Technical Field

[0001] This utility model relates to the field of railway box girder reinforcement binding, and in particular to a jig for box girder reinforcement binding. Background Technology

[0002] High-speed railway bridges mainly use precast and erected prestressed concrete simply supported box girders. The widespread adoption of box girders has improved the spanning capacity of bridges, can replace short-span continuous beams, reduces the number of piers, improves production efficiency, and has certain economic advantages. Simply supported box girders are suitable for the construction and operation of high-speed railways.

[0003] However, before the box girder is fabricated, the steel reinforcement cage of the box girder needs to be tied using a jig. Currently, the box girders used have spans of 40m and 32m. The jigs used for different types of box girders are not interchangeable, which means that different jigs need to be changed during the construction of the box girder to fabricate box girders of different spans. In actual construction, there are problems such as low jig utilization efficiency and time-consuming and labor-intensive jig replacement. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies where different types of box girders use non-universal jigs, and to provide a jig for binding the reinforcing bars of box girders.

[0005] A jig for binding steel bars in box girders, characterized in that it comprises:

[0006] The outer frame is provided with a plurality of sleeves, the sleeves being detachably connected to support legs, and the support legs being provided with pulleys;

[0007] The inner frame includes a sliding frame and several lifting platforms. The sliding frame abuts against the pulleys and can move along the rolling direction of the pulleys. The lifting platforms are arranged on the sliding frame and are used for tying reinforcing bars.

[0008] This utility model discloses a jig for tying rebar in box girders. An inner frame is installed inside an outer frame, supported by pulleys. The top of a lifting platform is used for tying rebar, allowing the lifting platform and the outer frame to work together to form a tying area for the rebar. Several outriggers are inserted into different sleeves for fixation, thus securing the position of the pulleys. The outriggers and sleeves are detachably connected, facilitating the hoisting of the tied rebar cage after removal. The lifting platform can adjust the height of the inner box girder for different beam types. When the lifting platform is lowered, it detaches from the rebar cage and, in conjunction with the sliding frame, moves to different areas for rebar tying. This jig for tying box girder rebar is adaptable to box girder rebar cages of different spans, improving construction efficiency.

[0009] Preferably, it further includes a drive mechanism, which is connected to the sliding frame and is used to drive the sliding frame to move along the rolling direction of the pulley.

[0010] The drive mechanism drives the sliding frame to move along the direction guided by the pulley components, thereby controlling the displacement of the sliding frame and enabling the lifting platform to move to the designated position for steel cage binding. The drive mechanism is fixed on the ground.

[0011] Preferably, the driving mechanism includes a transmission chain and a drive motor, the transmission chain is connected to the sliding frame, the drive motor is connected to the chain, and the drive motor is capable of driving the transmission chain to move.

[0012] The transmission chain is fixed on the sliding frame. The transmission chain is composed of several chain links that are hinged together. The transmission chain is driven by a drive motor to move, thereby causing the transmission chain to move the sliding frame.

[0013] Preferably, the drive motor is provided with a gear that can mesh with the transmission chain, the sliding frame is provided with a groove, the transmission chain is welded and fixed in the groove, and the drive motor can drive the gear to rotate.

[0014] The drive motor drives the gear to rotate, the gear rotates and drives the chain to rotate, and the movement of the chain causes the sliding frame to move; the grooved part limits the chain and ensures that the chain and gear are firmly connected.

[0015] Preferably, the lifting platform includes a lifting frame and a top support platform. The lifting frame is connected to the top support platform, and the lifting frame is slidably connected to the sliding frame. The sliding frame is provided with a lifting mechanism, which is connected to the lifting frame. The top support platform is used for tying reinforcing bars.

[0016] The lifting frame and the sliding frame are slidably connected, restricting the lifting frame to only vertical displacement; the lifting frame can be raised to a designated position for steel cage binding. After the steel cage is bound, the height of the top support platform is lowered to detach the top support platform from the steel cage, thereby allowing the sliding frame to move relative to the outer frame; the lifting mechanism can use an electric push rod.

[0017] Preferably, several of the lifting frames are arranged at intervals on the sliding frame.

[0018] The lifting frames are arranged on the sliding frame, so that the top support platform of the lifting frame is arranged in a row. There is a gap between adjacent lifting frames to avoid interference between adjacent lifting frames.

[0019] Preferably, the top support platform includes a first platform, a second platform, a third platform, a fourth platform, a first variable-section platform, and a second variable-section platform; a plurality of the first platforms are joined end-to-end to form a first binding platform, one end of the first variable-section platform abuts against the first binding platform and the other end abuts against the second platform; a plurality of the third platforms are joined end-to-end to form a second binding platform, one end of the second variable-section platform abuts against the second binding platform and the other end abuts against the fourth platform; the first platform, the second platform, the third platform, the fourth platform, the first variable-section platform, and the second variable-section platform are respectively connected to a lifting frame, and the first variable-section platform is located between the first binding platform and the second binding platform.

[0020] The first and second platforms allow for the binding of shorter box girder reinforcement cages, while the second and fourth platforms allow for the binding of longer box girder reinforcement cages. The jig used for binding box girder reinforcement can be applied to box girder reinforcement cages of different lengths. Typically, the total length of the inner frame is 40m, with the second platform located at 32m. After the reinforcement cage is bound, the top support platform is detached from the reinforcement cage via a lowering and lifting mechanism, allowing the sliding frame to move on the outer frame and detach from the reinforcement cage, facilitating the hoisting of the reinforcement cage.

[0021] Preferably, the top support platform further includes several strip-shaped structural members, one end of which is detachably connected to the first binding platform and the other end of which is detachably connected to the second binding platform, and the top of the strip-shaped structural members is used for binding reinforcing bars.

[0022] When binding the long box girder reinforcement cage, strip-shaped structural members are erected above the second platform and the first variable section platform to prevent the cross-section of the long box girder reinforcement cage at the second platform and the first variable section platform from becoming smaller.

[0023] Preferably, the lifting frame is equipped with a limiting member that can be engaged with the sliding frame. The limiting member secures the lifting frame at a specified height, preventing displacement of the support platform and avoiding overall loss of control due to lifting mechanism malfunction.

[0024] Preferably, the outer frame is provided with two rows of sleeves, a plurality of pulleys are arranged to form a first guide wheel group, a plurality of pulleys are arranged to form a second guide wheel group, and the first guide wheel group and the second guide wheel group are spaced apart; the sliding frame is provided with a first sliding rod and a second sliding rod, the first sliding rod abuts against the first guide wheel group, the second sliding rod abuts against the second guide wheel group, and the first sliding rod and the second sliding rod are parallel.

[0025] The sliding frame is easily moved by the rotation of the first guide wheel group and the second guide wheel group. The first guide wheel group and the second guide wheel group guide the first sliding rod and the second sliding rod respectively, so that the sliding frame can only be displaced in the specified direction.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] 1. This utility model provides a jig for tying rebar in box girders. The inner frame is set inside the outer frame and is supported by pulleys. The top of the lifting platform is used for tying rebar, so that the lifting platform and the outer frame work together to form a tying area for the rebar. Several outriggers are inserted into different sleeves for fixing, thereby fixing the position of the pulleys. The outriggers and sleeves are detachably connected, and after the outriggers are removed, it is easy to hoist the tied rebar cage. The lifting platform can adjust the height of the inner box for different beam types. After the height of the lifting platform is lowered, it is detached from the rebar cage. With the sliding frame, the lifting platform can be moved to different areas for rebar tying. The jig for tying rebar in box girders is adaptable to tying rebar cages of box girders with different spans, improving construction efficiency.

[0028] 2. This utility model provides a jig for binding the reinforcing bars of box girders. The lifting platform solves the problem that jigs cannot be shared for different beam types with different inner box heights. The sliding frame and pulleys are connected in a rolling manner, which solves the problem that jigs cannot be shared for beam types with different spans. The sliding frame on the inner frame can slide relative to the outer frame, which enhances flexibility and reduces labor and costs.

[0029] 3. This utility model provides a jig for binding the reinforcing bars of box girders. It has strong versatility and provides strong technical support for beam yards with simply supported box girders of different spans. It has the characteristics of simple structure, flexible use, high tooling utilization rate, convenient operation and high safety. It has good economic and practical value. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the structure of a jig for binding the reinforcing bars of a box girder according to the present invention;

[0031] Figure 2 is a schematic diagram of the inner frame of a jig for binding the reinforcing bars of a box girder according to the present invention.

[0032] Figure 3 is a structural schematic diagram of a lifting platform for a jig used for binding the reinforcing bars of a box girder according to the present invention;

[0033] Figure 4 is a side view of the inner frame of a jig for binding the reinforcing bars of a box girder according to Embodiment 1.

[0034] Figure 5 is a schematic diagram of the drive mechanism of a jig for binding the reinforcing bars of a box girder in Embodiment 1.

[0035] Figure 6 is a schematic diagram of the limiting component of a jig for binding the reinforcing bars of a box girder in Embodiment 1;

[0036] Figure 7 is a schematic diagram of the internal frame of a jig used for binding the reinforcing bars of a box girder in Embodiment 2.

[0037] Marked in the image:

[0038] 1-External scaffolding,

[0039] 2-Inner frame, 21-Sliding frame, 211-First sliding rod, 212-Second sliding rod, 22-Lifting platform, 221-Lifting frame, 222-Top support platform, 2221-First platform, 2222-Second platform, 2223-Third platform, 2224-Fourth platform, 2225-First variable section platform, 2226-Second variable section platform, 2227-Strip structural component, 223-Lifting mechanism

[0040] 3-Sleeve, 4-Leg, 5-Pulley assembly

[0041] 6-Drive mechanism, 61-Transmission chain, 62-Groove part, 63-Gear, 64-Drive motor

[0042] 7-Limiting component. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0044] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0045] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0046] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0047] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0048] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0049] Example 1

[0050] As shown in Figures 1-6, a jig for binding the reinforcing bars of a box girder is specifically composed of an outer jig 1 and an inner jig 2. Several sleeves 3 are provided in the binding area inside the outer jig 1 to support the inner jig 2.

[0051] The inner frame 2 is composed of a sliding frame 21 and several lifting platforms 22. The top of the support leg 4 is provided with pulley 5. The support leg 4 is inserted into the sleeve 3 in a one-to-one manner, so that the support leg 4 and the sleeve 3 are detachably connected. The sliding frame 21 is connected to the pulley 5. The sliding frame 21 can move along the rolling direction of the pulley 5. Several lifting platforms 22 are arranged on the sliding frame 21 to form a template for binding the top of the steel cage. The steel bars are bound on the lifting platform 22 to cooperate with the steel bars bound on the outer frame 1 to form the steel cage of the box girder.

[0052] The inner frame 2 is installed inside the outer frame 1, and the sliding frame 21 is supported by pulleys 5. The top of the lifting platform 22 is used for tying steel bars, so that the lifting platform 22 and the outer frame 1 work together to form a tying area for the steel bars. Several outriggers 4 are inserted into different sleeves 3 for fixation, thereby fixing the position of the pulleys 5. The outriggers 4 and sleeves 3 are detachably connected. After the outriggers 4 are removed, it is convenient to hoist the tied steel cage. The lifting platform 22 can adjust the height of the inner box for different beam types. After the height of the lifting platform 22 is lowered, it is detached from the steel cage. With the sliding frame 21, the lifting platform 22 can be moved to different areas for steel bar tying. The jig used for tying box girder steel bars is adapted to the tying of box girder steel cages of different spans, improving construction efficiency.

[0053] In one or more embodiments, a drive mechanism 6 is further included. The drive mechanism 6 is connected to the sliding frame 21 and is used to drive the sliding frame 21 to move along the rolling direction of the pulley 5. Specifically, the drive mechanism 6 consists of a transmission chain 61 and a drive motor 64. The transmission chain 61 is connected to the sliding frame 21, and the drive motor 64 is connected to the chain. The drive motor 64 can drive the transmission chain 61 to move. The drive motor 64 is provided with a gear 63, which can mesh with the transmission chain 61. The sliding frame 21 is provided with a groove 62, and the transmission chain 61 is welded and fixed in the groove 62. The drive motor 64 can drive the gear 63 to rotate. The drive motor 64 can be a servo motor. The servo motor drives the gear 63 to rotate, thereby driving the transmission chain 61 to move, so that the transmission chain 61 drives the sliding frame 21 to move. The drive motor 64 is fixed on the ground.

[0054] In one or more embodiments, the lifting platform 22 includes a lifting frame 221 and a top support platform 222. The lifting frame 221 is connected to the top support platform 222, and the lifting frame 221 is slidably connected to the sliding frame 21, restricting the lifting frame 221 to only slide vertically. The sliding frame 21 is provided with a lifting mechanism 223, which is connected to the lifting frame 221. The top support platform 222 is used for tying reinforcing bars. Specifically, a first telescopic rod is provided at the top of the sliding frame 21, and a second telescopic rod is provided on the lifting frame 221. The first telescopic rod and the second telescopic rod are nested together to guide the lifting frame 221 and restrict the lifting frame 221 to only slide vertically. In some embodiments, the sliding frame 21 and the lifting frame 221 can be connected by a sliding groove and a sliding member so that the sliding frame 21 can only move in the vertical direction.

[0055] In an optional embodiment, a plurality of lifting frames 221 are arranged at intervals on the sliding frame 21. Specifically, the lifting frames 221 are arranged on the sliding frame 21 so that the top support platform 222 of the lifting frames 221 is arranged.

[0056] In an optional embodiment, the lifting frame 221 is provided with a limiting member 7, which can be engaged with the sliding frame 21. Specifically, the limiting member 7 is a pin. The lifting frame 221 is provided with a first limiting hole, and the sliding frame 21 is provided with a second limiting hole. After the first limiting hole and the second limiting hole are aligned, the pin is inserted into the first limiting hole and the second limiting hole to limit the lifting frame 221.

[0057] In one or more embodiments, the outer frame 1 is provided with two rows of sleeves 3, and a plurality of pulley components 5 are arranged to form a first guide wheel group, and a plurality of pulley components 5 are arranged to form a second guide wheel group, with the first guide wheel group and the second guide wheel group spaced apart; the sliding frame 21 is provided with a first sliding rod 211 and a second sliding rod 212, the first sliding rod 211 abuts against the first guide wheel group, the second sliding rod 212 abuts against the second guide wheel group, and the first sliding rod 211 and the second sliding rod 212 are parallel; specifically, the first guide wheel group and the second guide wheel group are each composed of a plurality of guide wheels, the guide wheels of the first guide wheel group are arranged in a straight line, the guide wheels of the second guide wheel group are arranged in a straight line, and an annular groove is provided on the guide wheel to limit the first sliding rod 211 or the second sliding rod 212, so that the sliding member can only move along the specified direction.

[0058] Specifically, the sleeve 3 is fixed to the bottom of the outer frame 1 using a 100mm diameter steel pipe. The sleeve 3 is shared with the drain pipe fixture. The support leg 4 is connected to the sliding frame 21 using a 90mm outer diameter steel pipe. The top of the sliding frame 21 is fixed with a first guide wheel group and a second guide wheel group. The first guide wheel group consists of 10 guide wheels arranged at intervals, and the second guide wheel group consists of 10 guide wheels arranged at intervals. The support leg 4 is detachably connected to the sleeve 3, making the sliding frame 21 detachable from the outer frame 1. There are 20 lifting platforms 22 on the sliding frame 21. The height of the lifting platform 22 is set according to the height of the inner box in the design drawings. The lifting frame 221 of each lifting platform 22 is welded with 100mm square steel. Two 90mm diameter steel pipes are welded onto the sliding frame 21. These two pipes, along with the first and second guide wheel sets, form the traveling system. Each lifting platform 22 uses a hydraulic cylinder as the lifting mechanism 223 for support. The cylinder uses a hydraulic system for lifting, allowing the inner frame 2 to be adjusted according to the height of the box girder, thus solving the problem of different heights between 40m and 32m inner boxes. After the hydraulic cylinder is in place, a pin is installed on the vertical square steel of the lifting frame 221 as a limit element 7 to prevent the lifting platform 22 from going out of control due to hydraulic system failure. The steel reinforcement support platform 222 is made of 3mm thick checkered steel plate welded to the top of the lifting frame 221. Three rows of longitudinal angle steel are welded to the top of the support platform 222, and one row of angle steel is welded every two meters laterally. Grooves are cut on the angle steel according to the design drawings for the spacing of the reinforcing bars. The longitudinal angle steel is fixedly connected to the transverse reinforcing bars, and the transverse reinforcing bars are fixedly connected to the longitudinal reinforcing bars, ensuring the spacing and linearity requirements of the reinforcing bars of the support platform 222.

[0059] The drive system consists of a transmission chain 61 and a drive motor 64. A single, continuous channel steel is welded to the bottom of the sliding frame 21, and the transmission chain 61 is then welded to the bottom of the channel steel to form a drive guide rail. The drive motor 64 consists of a platform frame, gears 63, and the motor itself. The frame of the drive motor 64 is welded from square steel and is placed at one end of the inner frame 2, between the two pre-tied areas. When the inner frame 2 descends to its lowest height, the transmission chain 61 at the bottom of the inner frame 2 connects to the gears 63 on the drive motor 64. The motor drives the gears 63 to rotate, causing relative displacement between the gears 63 and the transmission chain 61, thus displacing the inner frame 2 and allowing it to move from one pre-tied area to another.

[0060] Example 2

[0061] Figure 7 shows a jig for binding the reinforcing bars of a box girder. Its structure is the same as that of Embodiment 1. The difference from Embodiment 1 is that the top support platform 222 includes a first platform 2221, a second platform 2222, a third platform 2223, a fourth platform 2224, a first variable-section platform 2225, and a second variable-section platform 2226. Several first platforms 2221 are connected end to end to form a first binding platform. One end of the first variable-section platform 2225 is connected to the first binding platform and the other end is connected to the second platform 2222. Several third platforms 2223 are connected end to end to form a second binding platform. One end of the second variable-section platform 2226 is connected to the second binding platform and the other end is connected to the fourth platform 2224. The first platform 2221, the second platform 2222, the third platform 2223, the fourth platform 2224, the first variable-section platform 2225, and the second variable-section platform 2226 are respectively connected to a lifting frame 221. The first variable-section platform 2225 is located between the first binding platform and the second binding platform.

[0062] In an optional embodiment, the top support platform 222 further includes a plurality of strip-shaped structural members 2227, one end of which is detachably connected to the first binding platform and the other end of which is detachably connected to the second binding platform, and the top of which is used for binding reinforcing bars.

[0063] Specifically, a first variable-section platform 2225 and a second platform 2222 are re-installed at a position 8m from the beam at one end of the 40m inner frame 2 for binding the 32m opening. Three rows of movable angle steel are installed on top of the first variable-section platform 2225 and the second platform 2222 as strip structural members 2227 for binding the reinforcing bars. When using the 32m inner frame 2, the three rows of movable angle steel are removed, and the height of the inner frame 2 is adjusted to the designed height of the 32m inner box using a hydraulic system, which can meet the needs of the 32m inner frame 2. When converting to the 40m inner frame 2, the three rows of movable angle steel are installed and fixed, and the height of the inner frame 2 is adjusted to the designed height of the 40m inner box, which can meet the needs of the 40m inner frame 2. This solution solves the problem that the 40m / 32m inner frames 2 cannot be used together due to their different lengths.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A jig for binding the reinforcing bars of a box girder, characterized in that, include: The outer frame (1) is provided with a plurality of sleeves (3), the sleeves (3) are detachably connected to the support legs (4), and the support legs (4) are provided with pulleys (5); the inner frame (2) includes a sliding frame (21) and a plurality of lifting platforms (22), the sliding frame (21) abuts against the pulleys (5), the sliding frame (21) can move along the rolling direction of the pulleys (5), and the plurality of lifting platforms (22) are arranged on the sliding frame (21), and the lifting platforms (22) are used for tying steel bars.

2. The jig for binding the reinforcing bars of a box girder according to claim 1, characterized in that, It also includes a drive mechanism (6), which is connected to the sliding frame (21) and is used to drive the sliding frame (21) to move along the rolling direction of the pulley (5).

3. The jig for binding the reinforcing bars of a box girder according to claim 2, characterized in that, The drive mechanism (6) includes a transmission chain (61) and a drive motor (64). The transmission chain (61) is connected to the sliding frame (21), and the drive motor (64) is connected to the chain. The drive motor (64) can drive the transmission chain (61) to move.

4. The jig for binding the reinforcing bars of a box girder according to claim 3, characterized in that, The drive motor (64) is equipped with a gear (63), which can mesh with the transmission chain (61). The sliding frame (21) is equipped with a groove (62), and the transmission chain (61) is welded and fixed in the groove (62). The drive motor (64) can drive the gear (63) to rotate.

5. The jig for binding the reinforcing bars of a box girder according to claim 1, characterized in that, The lifting platform (22) includes a lifting frame (221) and a top support platform (222). The lifting frame (221) is connected to the top support platform (222). The lifting frame (221) is slidably connected to the sliding frame (21). The sliding frame (21) is provided with a lifting mechanism (223). The lifting mechanism (223) is connected to the lifting frame (221). The top support platform (222) is used for tying reinforcing bars.

6. A jig for binding steel bars in box girders according to claim 5, characterized in that, Several of the lifting frames (221) are arranged at intervals on the sliding frame (21).

7. A jig for binding reinforcement bars of box girders according to claim 6, characterized in that, The top support platform (222) includes a first platform (2221), a second platform (2222), a third platform (2223), a fourth platform (2224), a first variable-section platform (2225), and a second variable-section platform (2226); a plurality of the first platforms (2221) are joined end-to-end to form a first binding platform, and one end of the first variable-section platform (2225) is joined to the first binding platform and the other end is joined to the second platform (2222); a plurality of the third platforms (2223) are joined end-to-end to form a second binding platform. The platform has one end of the second variable-section platform (2226) abutting against the second binding platform and the other end abutting against the fourth platform (2224); the first platform (2221), the second platform (2222), the third platform (2223), the fourth platform (2224), the first variable-section platform (2225) and the second variable-section platform (2226) are respectively connected to the lifting frame (221), and the first variable-section platform (2225) is located between the first binding platform and the second binding platform.

8. A jig for binding steel bars in box girders according to claim 7, characterized in that, The top support platform (222) also includes several strip-shaped structural members (2227), one end of which is detachably connected to the first binding platform and the other end of which is detachably connected to the second binding platform. The top of the strip-shaped structural member is used for binding reinforcing bars.

9. A jig for binding steel bars in box girders according to claim 5, characterized in that, The lifting frame (221) is provided with a limiting member (7), which can be engaged and connected with the sliding frame (21).

10. A jig for binding steel bars in box girders according to any one of claims 1-9, characterized in that, The outer frame (1) is provided with two rows of sleeves (3), and a number of pulleys (5) are arranged to form a first guide wheel group, and a number of pulleys (5) are arranged to form a second guide wheel group. The first guide wheel group and the second guide wheel group are spaced apart. The sliding frame (21) is provided with a first sliding rod (211) and a second sliding rod (212). The first sliding rod (211) abuts against the first guide wheel group, and the second sliding rod (212) abuts against the second guide wheel group. The first sliding rod (211) and the second sliding rod (212) are parallel.

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