Bridge chord bolting splice plate mounting jig

Abstract

The utility model discloses a mounting jig for a bolting splice plate of a bridge chord member. In the construction of a steel truss girder bridge, the traditional installation mode of splice plates in the axial joint of a steel girder has the problems of low efficiency, poor precision, difficulty in operation and the like. The jig comprises a pair of supporting frames arranged in the axial direction of the steel beam at intervals and a moving assembly installed on the lower sides of the supporting frames. The supporting frame is formed by splicing an upper framework, a lower framework and a side framework into a rectangle, inner splicing plates are installed corresponding to the side faces in the steel beams respectively and fixed through second installation holes and bolts, and guide rods are further arranged. And rollers of the moving assembly are mounted on the lower framework. During use, the inner splice plates and the supporting frame are assembled into a combination outside the steel beam, then the combination is moved to the connecting position through the moving assembly, and the inner splice plates are accurately installed through the guide rods. The jig effectively overcomes the defects of traditional installation, installation efficiency and quality are improved, stable connection of the steel beams is guaranteed, the construction cost is reduced, the construction period is shortened, and the supporting frame can be repeatedly used.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge engineering construction technical field, concretely relates to a bridge chord bolted splice plate mounting fixture. BACKGROUND

[0002] In the construction of steel truss girder bridge, the bolted joint is the key part of connecting the steel girder, and the installation of the inner splice plate is crucial to ensure the stability of the steel girder connection. With the development of bridge construction technology, the precision and efficiency of the installation of the inner splice plate at the bolted joint are increasingly required.

[0003] In the past, when installing the inner splice plate at the axial connection of the steel girder, workers usually install the inner splice plate piece by piece in the limited operating space after the steel girder is installed in place. First, the inner splice plate is roughly aligned with the corresponding mounting hole on the steel girder, then the bolt is fastened through the mounting hole using a tool, and the position of the inner splice plate needs to be adjusted constantly during the installation process to ensure its installation precision. This traditional installation method has many drawbacks. Due to the narrow space inside the steel girder, the workers have difficulty operating, resulting in extremely low installation efficiency. During the installation process, it is difficult to ensure the accurate alignment of the inner splice plate with the mounting hole of the steel girder, and installation deviation may easily occur, affecting the connection quality. Moreover, for the installation of a large number of inner splice plates, this piece-by-piece installation method consumes a lot of manpower and time, greatly increasing the construction cost and construction period, and has been unable to meet the demand for high efficiency and high quality of modern bridge construction.

[0004] Therefore, the above problems need to be solved. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the above shortcomings, and provides a bridge chord bolted splice plate mounting fixture. By setting a pair of spaced support frames and cooperating with the moving assembly, the inner splice plate and the support frame are first assembled into a combination outside the steel girder, and then the moving assembly is used to move the combination conveniently inside the steel girder to the axial connection for installation, effectively solving the problems of low efficiency, poor precision and difficult operation of traditional piece-by-piece installation of the inner splice plate in the narrow space inside the steel girder, improving the installation efficiency and quality of the bridge chord bolted splice plate, ensuring the stability and reliability of the steel girder connection, and reducing the construction cost and construction period.

[0006] Technical solution: The utility model provides a bridge chord bolted splice plate mounting jig is used for installing the inner splice plate at a pair of steel beam axial connection, a group of corresponding installation holes are arranged on the steel beam, the inner splice plate respectively, the jig includes: a pair of support frame, a pair of support frame is along the steel beam axial interval arrangement, the inner splice plate cover is installed in a pair of support frame outside, and support frame forms the combination, moving assembly, moving assembly is installed in support frame downside, is used for in the steel beam inside moving combination, moves combination to two steel beam axial connection, unloads the inner splice plate, and the steel beam and the inner splice plate are connected through the installation hole corresponding connection. A pair of support frame can stably cover and install the inner splice plate on its outside, form the combination, ensure that the inner splice plate is in the relatively fixed and easy operation state before moving and installing, effectively avoid the displacement and confusion of the inner splice plate in the preparation installation process, moving assembly is installed in support frame downside, can realize the efficient movement of combination in the steel beam, can accurately move combination to the specified position of two steel beam axial connection, provides basic guarantee for the accurate installation of subsequent inner splice plate, greatly improves the problem that the inner splice plate is difficult to accurately place in the narrow space in the steel beam.

[0007] Further, the bridge chord bolted splice plate mounting jig in the application, the support frame includes upper frame, lower frame, a pair of side frames, a pair of side frames are arranged between the upper frame and the lower frame, are spliced to form a rectangle, a pair of inner splice plates installed on the upper frame correspond to the upper side of the steel beam, a pair of inner splice plates installed on the lower frame correspond to the lower side of the steel beam, and a pair of inner splice plates installed on the side frame correspond to a pair of vertical side surfaces of the steel beam. The design of the upper frame, the lower frame and the pair of side frames can install the inner splice plate corresponding to the upper side, the lower side and the pair of vertical side surfaces of the steel beam respectively, realize the overall coverage and adaptation of different surfaces of the steel beam, and ensure that stable support and positioning can be provided for the inner splice plate in all directions. The design of dividing the support frame into different parts and splicing into a whole facilitates the manufacture, transportation and on-site assembly of the jig. Each frame can be processed and produced separately, and can be quickly spliced into a complete support frame according to the actual size and installation requirements of the steel beam at the construction site, improving the flexibility and convenience of construction.

[0008] Further, the bridge chord bolted splice plate mounting jig in the application, the moving assembly includes a group of rollers, and the rollers are installed on the lower frame. As a key part of the moving assembly, the rollers can enable the support frame and the inner splice plate combination connected thereto to move in a rolling manner inside the steel beam.

[0009] Further, the bridge chord bolted splice plate installation jig in the application, the upper framework, including a pair of upper horizontal rods, a pair of upper vertical rods and upper connecting rods, two upper horizontal rods are horizontally and spaced apart, and the opposite ends are welded with one end of the upper vertical rod, the upper vertical rod is vertically arranged, and the other end is detachably connected with the upper connecting rod, the upper horizontal rod, the upper vertical rod and the upper connecting rod form a groove downward, and the longitudinal rib on the upper side downward is arranged in the groove. The structural design of the upper framework can closely cooperate with the longitudinal rib on the upper side of the steel beam. The groove formed thereby provides a space for the longitudinal rib, so that the upper framework can be accurately positioned according to the position of the longitudinal rib during installation. The upper vertical rod and the upper connecting rod are detachably connected, which facilitates the assembly, disassembly and adjustment of the upper framework under different construction scenes or maintenance requirements. This design increases the flexibility of the upper framework, facilitates transportation and storage, and is also conducive to rapid assembly and modification according to the actual situation on the construction site.

[0010] Further, the bridge chord bolted splice plate installation jig in the application, the lower framework and the upper framework are symmetrically arranged, including a pair of lower horizontal rods, a pair of lower vertical rods and a lower connecting rod, two lower horizontal rods are horizontally and spaced apart, and the opposite ends are welded with one end of the lower vertical rod, the lower vertical rod is vertically arranged, and the other end is detachably connected with the lower connecting rod, the lower horizontal rod, the lower vertical rod and the lower connecting rod form a convex part upward, and the convex part is arranged on the longitudinal rib upward arranged on the lower side. The symmetric arrangement of the lower framework and the upper framework ensures the stability and balance of the whole support frame structure. It can accurately adapt to the longitudinal rib on the lower side of the steel beam.

[0011] Further, the bridge chord bolted splice plate installation jig in the application, the side framework includes a pair of side vertical rods, a pair of the side vertical rods are vertically and spaced apart, and the opposite ends are provided with side connecting rods side by side in the vertical direction, the side connecting rods are detachably installed on the two ends, the side connecting rods are installed on the side away from the vertical side, a pair of the side vertical rods and the side connecting rods form a concave part, a pair of the vertical sides are provided with longitudinal ribs opposite to each other, the longitudinal ribs are arranged in the concave part, and the other ends of the two side vertical rods are welded with the upper horizontal rod and the lower horizontal rod. The concave part formed by the pair of side vertical rods and the detachable side connecting rods of the side framework can accurately accommodate the longitudinal rib of the vertical side of the steel beam, preventing the combination from moving and deviating in the steel beam.

[0012] Further, the bridge chord bolted splice plate installation jig in the application, the support frame is further provided with a second installation hole, and the inner splice plate and the second installation hole are connected through bolts. The inner splice plate is fixed on the support frame through bolts, which can effectively prevent the inner splice plate from moving or falling off relative to the support frame during assembly into a combination and subsequent movement, and ensure the integrity and stability of the combination.

[0013] Further, the bridge chord bolted splice plate mounting jig in the application is provided with a guide rod on the support frame, and the guide rod is arranged through the second mounting hole, the mounting hole of the steel beam and the mounting hole of the inner splice plate. The guide rod can provide accurate position guidance for the inner splice plate during installation. When the combination moves to the axial connection of the steel beam, the guide rod is arranged through the second mounting hole of the support frame, the mounting hole of the steel beam and the mounting hole of the inner splice plate in sequence, so that the position of the inner splice plate in each direction is highly matched with the mounting position of the steel beam, and the position deviation during installation is effectively reduced. During the process of transferring the inner splice plate from the support frame to the steel beam for installation, the guide rod limits the random displacement of the inner splice plate, so that the inner splice plate can only move and adjust along the direction of the guide rod, the misalignment of the inner splice plate and the mounting hole of the steel beam caused by external force or improper operation is avoided, and the orderliness and accuracy of the installation process are ensured.

[0014] The above technical scheme can achieve the following beneficial effects:

[0015] 1. The bridge chord bolted splice plate mounting jig has the following beneficial effects: the pair of spaced support frames are matched with the moving assembly, the inner splice plate and the support frame are assembled into a combination outside the steel beam, the combination is moved to the axial connection inside the steel beam for installation by using the moving assembly, the problems of low efficiency, poor precision and difficult operation of the traditional block-by-block installation of the inner splice plate in the narrow space inside the steel beam are effectively solved, the installation efficiency and quality of the bridge chord bolted splice plate are greatly improved, the stability and reliability of the steel beam connection are ensured, the construction cost and construction period are reduced, and the efficient and high-quality demand of modern bridge construction is met.

[0016] 2. The bridge chord bolted splice plate mounting jig has the following beneficial effects: the support frame is divided into different parts such as the upper frame, the lower frame and the side frame, each part can be matched with different sides of the steel beam, and the frames are connected in a reasonable way, so that the jig can be manufactured, transported and assembled on site, and stable support and positioning of the inner splice plate in each direction are provided; the stability and accuracy of the inner splice plate during movement and installation are further ensured by the guide rod and the second mounting hole, the installation deviation is effectively reduced, and the accurate connection of the inner splice plate and the steel beam is better achieved, and the overall construction effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a bridge chord bolted splice plate mounting jig structure schematic view of the utility model;

[0018] Figure 2 It is a combination structure schematic view of the utility model;

[0019] Figure 3 It is a first schematic view of the steel beam combined with the combination structure of the utility model;

[0020] Figure 4 It is the second schematic view of steel beam combined structure of the utility model;

[0021] Figure 5 It is the schematic view of steel beam structure of the utility model.

[0022] The description of the drawing of the specification: 1-steel beam, 11-upper side, 12-lower side, 13-vertical side, 14-longitudinal rib, 2-inner splice plate, 3-mounting hole, 4-support frame, 41-upper framework, 411-upper horizontal rod, 412-upper vertical rod, 413-upper connecting rod, 414-groove, 42-lower framework, 421-lower horizontal rod, 422-lower vertical rod, 423-lower connecting rod, 4224-convex part, 43-lateral framework, 431-lateral vertical rod, 432-lateral connecting rod, 433-inner recess, 44-second mounting hole, 45-guide rod, 5-moving assembly, 51-roller, 6-combination, 7-outer splice plate, 8-opening. DETAILED DESCRIPTION

[0023] The utility model is further illustrated below in combination with the drawing and specific embodiment.

[0024] As Figure 1 , 3 , the bridge chord bolted splice plate installation jig shown in 5 is used to install the inner splice plate 2 at the axial connection of a pair of steel beams 1, a group of corresponding mounting holes 3 are respectively arranged on the steel beams 1 and the inner splice plate 2; the jig comprises: a pair of support frames 4, the pair of support frames 4 are arranged along the axial direction of the steel beams 1 and are spaced apart, the inner splice plate 2 is cover-mounted on the outer side of the pair of support frames 4 and forms a combination 6 with the support frames 4; a moving assembly 5 is installed on the lower side of the support frame 4 and is used to move the combination 6 in the steel beam 1, the combination 6 is moved to the axial connection of the two steel beams 1, the inner splice plate 2 is removed, and the steel beams 1 and the inner splice plate 2 are connected correspondingly through the mounting holes 3. The pair of support frames 4 can stably cover-mount the inner splice plate 2 on the outer side thereof to form the combination 6, ensure that the inner splice plate 2 is in a relatively fixed and easy-to-operate state before moving and installing, effectively avoid displacement and confusion of the inner splice plate 2 during preparation for installation, the moving assembly 5 is installed on the lower side of the support frame 4, the efficient movement of the combination 6 in the steel beam 1 can be realized, the combination 6 can be accurately moved to the specified position of the axial connection of the two steel beams 1, which provides basic guarantee for the accurate installation of the inner splice plate 2 subsequently, and greatly improves the problem that it is difficult to accurately place the inner splice plate 2 in the narrow space in the steel beam 1.

[0025] In the embodiment, as Figure 1 , 2As shown, the support frame 4 comprises an upper frame 41, a lower frame 42, and a pair of side frames 43. The pair of side frames 43 are arranged between the upper frame 41 and the lower frame 42 and are spliced together to form a rectangle. A pair of inner splice plates 2 installed on the upper frame 41 correspond to the upper side 11 of the steel beam 1. A pair of inner splice plates 2 installed on the lower frame 42 correspond to the lower side 12 of the steel beam 1. A pair of inner splice plates 2 installed on the side frame 43 correspond to the pair of vertical sides 13 of the steel beam 1. The design of the upper frame 41, the lower frame 42, and the pair of side frames 43 enables the installation of the inner splice plates 2 corresponding to the upper side 11, the lower side 12, and the pair of vertical sides 13 of the steel beam 1, respectively, achieving comprehensive coverage and adaptation of different surfaces of the steel beam 1, ensuring stable support and positioning of the inner splice plates 2 in all directions. The design of dividing the support frame 4 into different parts and splicing them into a whole facilitates the manufacturing, transportation, and on-site assembly of the jig. Each frame can be individually manufactured and quickly spliced into a complete support frame 4 according to the actual size and installation requirements of the steel beam 1 on the construction site, improving the flexibility and convenience of construction. Preferably, there are 8 inner splice plates 2, with 2 on each side of the rectangular support frame 4.

[0026] In this embodiment, as shown in Figure 1 The moving assembly 5 comprises a set of rollers 51 installed on the lower frame 42. The rollers 51, as the key part of the moving assembly 5, enable the support frame 4 and the inner splice plate 2 combination body 6 to move inside the steel beam 1 in a rolling manner. Preferably, the number of rollers is 2, forming a combination body 6 similar to a trolley structure. Two rollers are installed on each lower frame 42, and the trolley structure has a total of 4 rollers. The trolley structure is pulled by a small hand-operated hoist to move inside the steel beam.

[0027] In this embodiment, as shown in Figure 1 , 3As shown in Figure 4, the upper frame 41 includes a pair of upper horizontal bars 411, a pair of upper vertical bars 412, and an upper connecting rod 413. The two upper horizontal bars 411 are horizontally spaced apart, and their opposing ends are welded to one end of the upper vertical bar 412. The upper vertical bar 412 is vertically positioned, and its other end is detachably connected to the upper connecting rod 413. The upper horizontal bars 411, upper vertical bars 412, and upper connecting rod 413 form a downward groove 414, into which the longitudinal ribs 14 on the upper side 11 extend. The structural design of the upper frame 41 allows it to fit tightly with the longitudinal ribs 14 on the upper side 11 of the steel beam 1. The grooves 414 provide space for the longitudinal ribs 14, enabling the upper frame 41 to be accurately positioned according to the position of the longitudinal ribs 14 during installation. The upper vertical bars 412 and the upper connecting rods 413 are detachably connected, facilitating the assembly, disassembly, and adjustment of the upper frame 41 under different construction scenarios or maintenance needs. This design increases the flexibility of the upper frame 41, facilitating transportation and storage, and also allows for rapid assembly and modification on-site according to actual conditions. The upper vertical rod 412 is connected to the upper connecting rod 413 by bolts.

[0028] In this embodiment, as Figure 1 , 3 As shown in Figure 4, the lower frame 42 and upper frame 41 are symmetrically arranged, including a pair of lower horizontal bars 421, a pair of lower vertical bars 422, and a lower connecting rod 423. The two lower horizontal bars 421 are horizontally spaced apart, and their opposing ends are welded to one end of the lower vertical bars 422. The lower vertical bars 422 are vertically arranged, and their other ends are detachably connected to the lower connecting rod 423. The lower horizontal bars 421, lower vertical bars 422, and lower connecting rod 423 form an upward protrusion 424, which covers the longitudinal ribs 14 provided upward on the lower side surface 12. The symmetrical arrangement of the lower frame 42 and upper frame 41 ensures the stability and balance of the entire support frame 4 structure. It can be precisely adapted to the longitudinal ribs 14 on the lower side surface 12 of the steel beam 1. The lower vertical bars 422 and lower connecting rods 423 are connected by bolts.

[0029] In this embodiment, as Figure 1 , 3As shown in Figure 4, the side frame 43 includes a pair of side vertical rods 431, which are vertically spaced apart. Side connecting rods 432 are arranged side-by-side in the vertical direction at their opposing ends. The side connecting rods 432 are detachably mounted on both ends and are installed on the side away from the vertical side 13. The pair of side vertical rods 431 and side connecting rods 432 form a concave portion 433. The pair of vertical side 13s have opposing longitudinal ribs 14 extending into the concave portion 433. The other ends of the two side vertical rods 431 are welded to the upper horizontal rod 411 and the lower horizontal rod 421, respectively. The concave portion 433 formed by the pair of side vertical rods 431 and the detachable side connecting rods 432 of the side frame 43 can precisely accommodate the longitudinal ribs 14 of the vertical side 13 of the steel beam 1, preventing the assembly 6 from moving or deviating within the steel beam 1. The pair of side vertical rods 431 and side connecting rods are connected by bolts.

[0030] In this embodiment, as Figure 1 As shown, the support frame 4 is also provided with a second mounting hole 44, and the inner splicing plate 2 is connected to the second mounting hole 44 by bolts. By fixing the inner splicing plate 2 to the support frame 4 with bolts, it can effectively prevent the inner splicing plate 2 from shifting or falling off relative to the support frame 4 during assembly into the composite body 6 and subsequent movement, ensuring the integrity and stability of the composite body 6. The support frame 4 is also provided with a guide rod 45, which passes through the second mounting hole 44 and the mounting holes 3 on the steel beam 1 and the inner splicing plate 2. The guide rod 45 can provide precise positional guidance for the inner splicing plate 2 during installation. When assembly 6 moves to the axial connection point of steel beam 1, guide rod 45 passes sequentially through the second mounting hole 44 of support frame 4, the mounting hole 3 of steel beam 1, and the mounting hole 3 of inner splicing plate 2. This ensures that the position of inner splicing plate 2 in all directions is highly aligned with the installation position of steel beam 1, effectively reducing positional deviations during installation. During the transfer of inner splicing plate 2 from support frame 4 to steel beam 1 for installation, guide rod 45 restricts the arbitrary displacement of inner splicing plate 2, allowing it to move and adjust only along the direction of guide rod 45. This prevents misalignment between inner splicing plate 2 and steel beam 1 mounting hole 3 due to external force or improper operation, ensuring the orderly and accurate installation process. Guide rod 45 is made of round steel.

[0031] The following are the complete installation steps:

[0032] 1. Preparation and Transportation of Support Frame Components: Based on the actual dimensions of steel beam 1, the upper frame 41, lower frame 42, and side frame 43 of the support frame 4 are fabricated in the factory. Each frame can be transported to the construction site separately, facilitating transportation and adapting to different construction site conditions.

[0033] 2. On-site assembly of the support frame: At the construction site, place a pair of side frames 43 between the upper frame 41 and the lower frame 42, and splice them together to form a rectangle.

[0034] 3. Inner splice plate and support frame assembly: using the second mounting hole 44 on the support frame 4, the inner splice plate 2 is fastened with the support frame 4 by bolts, forming a stable assembly 6.

[0035] 4. Moving assembly installation: 2 rollers 51 are installed on the lower frame 42 on the lower side of the support frame 4, and the entire assembly 6 has a total of 4 rollers 51.

[0036] 5. Assembly moving into position: the assembly 6 is moved inside the steel beam 1 by the hand-operated hoist, and the assembly 6 is accurately moved to the designated position at the axial connection of the two steel beams 1.

[0037] 6. Inner splice plate installation: after the assembly 6 reaches the designated position, the bolts that fix the inner splice plate 2 and the support frame 4 are unscrewed. At this time, the guide rod 45 on the support frame 4 plays a role, as shown in Figure 3 , the outer splice plate 7 is provided on the outer side of the steel beam 1, and the guide rod 45 passes through the second mounting hole 44 of the support frame 4, the mounting hole 3 of the steel beam 1, the mounting hole 3 of the inner splice plate 2, and the mounting hole 3 of the outer splice plate 7 in sequence. Workers fine-tune the inner splice plate 2 along the direction of the guide rod 45 to ensure that it fits the mounting position of the steel beam 1 in all directions, and the inner and outer splice plates are moved and combined with the steel beam 1 through the guide rod 45. Finally, the bolts are fastened using tools to complete the installation.

[0038] 7. Disassembly and removal: after the installation is completed, the support frame 4 is disassembled into a frame, as shown in Figure 4 , the worker leaves the steel beam 1 through the opening 8 of the steel beam 1 and takes out the frame, which can be reused.

[0039] The above examples are exemplary, and the purpose is to illustrate the technical concept and characteristics of the present application, so that those skilled in the art can understand the content of the present application and implement it accordingly, and the protection scope of the present application cannot be limited thereby. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A bridge chord bolt splice plate mounting jig for mounting an inner splice plate (2) at an axial connection of a pair of steel girders (1), the steel girders (1), inner splice plate (2) each having an array of corresponding mounting holes (3) thereon, characterised in that: The utility model relates to a bridge stringer bolted splice plate installation tool, including: a pair of support frames (4), a pair of the support frames (4) are arranged axially spaced along the steel beam (1), the inner splice plate (2) cover set up in a pair of support frames (4) outside, and support frame (4) form the combination (6); moving assembly (5), moving assembly (5) is installed in support frame (4) downside, is used for moving combination (6) in the steel beam (1) inside, moves combination (6) to two steel beam (1) axial junction, unloads the inner splice plate (2), and through the installation hole (3) corresponding connection of steel beam (1) and inner splice plate (2).

2. The bridge stringer bolted splice plate installation tool according to claim 1, wherein: the support frame (4) includes an upper frame (41), a lower frame (42), and a pair of side frames (43), the pair of side frames (43) are arranged between the upper frame (41) and the lower frame (42), and are spliced to form a rectangle, the inner splice plate (2) installed on the pair of upper frames (41) corresponds to the upper side (11) of the steel beam (1), the inner splice plate (2) installed on the pair of lower frames (42) corresponds to the lower side (12) of the steel beam (1), and the inner splice plate (2) installed on the pair of side frames (43) corresponds to the pair of vertical sides (13) of the steel beam (1).

3. The bridge stringer bolted splice plate installation tool according to claim 2, wherein: the moving assembly (5) includes a set of rollers (51), and the rollers (51) are installed on the lower frame (42).

4. The bridge stringer bolted splice plate installation tool according to claim 3, wherein: the upper frame (41) includes a pair of upper horizontal rods (411), a pair of upper vertical rods (412), and an upper connecting rod (413), the two upper horizontal rods (411) are arranged horizontally and spaced apart, and the opposite ends are welded to one end of the upper vertical rod (412), the upper vertical rod (412) is arranged vertically, and the other end is detachably connected to the upper connecting rod (413), the upper horizontal rod (411), the upper vertical rod (412), and the upper connecting rod (413) form a groove (414) downward, and the longitudinal rib (14) arranged downward on the upper side (11) extends into the groove (414).

5. The bridge stringer bolted splice plate installation tool according to claim 4, wherein: the lower frame (42) and the upper frame (41) are arranged symmetrically and include a pair of lower horizontal rods (421), a pair of lower vertical rods (422), and a lower connecting rod (423), the two lower horizontal rods (421) are arranged horizontally and spaced apart, and the opposite ends are welded to one end of the lower vertical rod (422), the lower vertical rod (422) is arranged vertically, and the other end is detachably connected to the lower connecting rod (423), the lower horizontal rod (421), the lower vertical rod (422), and the lower connecting rod (423) form a convex part (424) upward, and the convex part (424) covers the longitudinal rib (14) arranged upward on the lower side (12).

6. The bridge stringer bolted splice plate installation tool according to claim 5, wherein: The side skeleton (43) comprises a pair of side vertical rods (431), the pair of side vertical rods (431) are vertically spaced apart, and opposite ends are provided with side connecting rods (432) side by side in the vertical direction, the side connecting rods (432) are detachably mounted on the two ends, the side connecting rods (432) are mounted on the side away from the vertical side (13), the pair of side vertical rods (431) and the side connecting rods (432) form a concave part (433), a pair of vertical sides (13) are provided with longitudinal ribs (14) opposite to each other, the longitudinal ribs (14) extend into the concave part (433), and the other ends of the two side vertical rods (431) are respectively welded with the upper cross rod (411) and the lower cross rod (421).

7. The bridge chord bolting splice plate mounting jig according to claim 1, characterized in that: The support frame (4) is further provided with a second mounting hole (44), and the inner splice plate (2) and the second mounting hole (44) are connected through bolts.

8. The bridge chord bolting splice plate mounting jig according to claim 7, characterized in that: The support frame (4) is further provided with a guide rod (45), and the guide rod (45) is arranged in the second mounting hole (44) and the mounting hole (3) on the steel beam (1) and the inner splice plate (2).

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