Fixing and supporting device for steel trestle

Abstract

The utility model is suitable for the technical field of steel trestles, and provides a steel trestle fixing and supporting device which comprises two stand columns. The two supporting frames are fixedly installed on the two stand columns respectively; the transverse rod is fixedly mounted on the two stand columns, and is fixedly connected with the two supporting frames; the two positioning blocks are respectively and fixedly arranged on the two upright posts; the two adjusting sleeves are respectively arranged on the two stand columns in a sleeving manner, and are respectively and fixedly connected with the two positioning blocks; the two fixing sleeves are arranged on the two stand columns in a sleeving mode respectively; the two connecting rods are hinged to the two adjusting sleeves and the fixed sleeve respectively, and the two connecting rods are arranged in a crossed mode. The fixing and supporting device of the steel trestle is convenient to mount and dismount, the construction efficiency of the steel trestle is improved, and the stability of the steel trestle is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel trestle bridges, in particular to a fixing support device for a steel trestle bridge. Background Art

[0002] Steel trestles are temporary structures built to support bridge construction projects. Especially in the construction of large and medium-sized offshore bridges, temporary trestles are often necessary to facilitate the transportation of materials, equipment, and personnel. Furthermore, steel trestles are widely used in a variety of scenarios, including post-disaster rescue, temporary construction, long-distance transportation, emergency response, and road and bridge maintenance.

[0003] However, during the construction of the steel trestle, the installation and disassembly of the supporting parts are relatively inconvenient due to their large size and mass, which not only increases the construction cost but may also cause construction delays. Utility Model Content

[0004] The utility model provides a fixed support device for a steel trestle, aiming to solve the problem in the above background technology that the currently used steel trestle support devices are inconvenient to install and disassemble, which reduces the building efficiency and increases the construction cost.

[0005] To solve the above problems, the present invention is implemented as follows: a fixed support device for a steel trestle, comprising: two columns; two support frames, the two support frames are respectively fixedly mounted on the two columns; a cross bar, the cross bar is fixedly mounted on the two columns and fixedly connected to the two support frames; two positioning blocks, the two positioning blocks are respectively fixedly mounted on the two columns; two adjusting sleeves, the two adjusting sleeves are respectively sleeved on the two columns and fixedly connected to the two positioning blocks; two fixing sleeves, the two fixing sleeves are respectively sleeved on the two columns; two connecting rods, the two connecting rods are respectively hinged on the two adjusting sleeves and the fixing sleeves, and are cross-arranged; two adjusting positioning mechanisms, the two adjusting positioning mechanisms are respectively arranged on the two adjusting sleeves, for positioning the distance between the adjusting sleeves and the fixing sleeves.

[0006] Preferably, the adjustment and positioning mechanism includes a positioning tube, a limiting groove, a limiting block, multiple through-ports, multiple positioning grooves and a positioning bolt. The positioning tube is slidably arranged in the adjustment sleeve and conflicts with the column. The limiting groove is opened in the adjustment sleeve. The limiting block is fixedly installed on the positioning tube. The limiting block is slidably connected to the limiting groove. Multiple through-ports are opened on the adjustment sleeve and corresponding to the limiting grooves. Multiple positioning grooves are opened on the column. Multiple positioning grooves are respectively corresponding to multiple through-ports. The positioning bolt is inserted into any through-port and connected to the corresponding positioning groove.

[0007] Preferably, a positioning ring is provided on the two columns, a plurality of sliding grooves are provided on the positioning ring, and a connecting pipe is provided on each of the two columns. The two connecting pipes are provided in the positioning ring and are respectively slidably connected to the plurality of sliding grooves. An operating mechanism is provided on the positioning ring for adjusting the position between the two positioning rings.

[0008] Preferably, the operating mechanism includes a fixed block, a bidirectional screw, two adjusting blocks, and four support rods. The fixed block is fixedly mounted on the positioning ring, the fixed block is arranged between the two columns, the bidirectional screw is rotatably mounted on the fixed block, the two adjusting blocks are both threadedly mounted on the bidirectional screw, the four support rods are respectively hinged between the two adjusting blocks and the connecting pipe, and the four support rods are arranged in a diamond shape.

[0009] Preferably, a traction plate is fixedly installed between the two adjusting sleeves and the two fixing sleeves, the two traction plates are arranged in parallel, and two connecting rods are arranged between the two traction plates.

[0010] Preferably, a protrusion is fixedly mounted on each of the two positioning tubes for pulling the positioning tube out of the adjusting sleeve. A receiving groove is provided on each of the two adjusting sleeves, and the two receiving grooves are respectively arranged corresponding to the two protrusions.

[0011] Preferably, the adjustment block consists of a threaded block and two mounting blocks, the threaded block is threadedly mounted on the bidirectional screw, the two mounting blocks are fixedly mounted on both sides of the threaded block, and the two mounting blocks are hinged to the two support rods respectively.

[0012] Compared with the related art, the fixed support device of the steel trestle provided by the utility model has the following beneficial effects:

[0013] Compared to existing technologies, the fixed support device for steel trestle bridges proposed in this solution features an adjustable support mechanism, specifically the coordinated use of adjustable and fixed sleeves, and a bidirectional screw-driven adjustment mechanism. This allows for flexible adjustment of support height and angle to suit varying working conditions and requirements, enhancing flexibility and adaptability during construction. The secure connection of components such as the columns, support frame, crossbars, and connecting rods creates a stable support framework, enhancing the overall structural stability and roll resistance. Furthermore, a precise adjustment and positioning mechanism ensures the stability and safety of the support device during use. Through its optimized design and convenient adjustment mechanism, this device reduces installation and disassembly inconvenience, lowering construction costs. Furthermore, precise adjustment and positioning minimize construction errors and delays, improving overall construction efficiency. The design of this device takes into account a variety of application scenarios and working conditions, resulting in high versatility. Furthermore, the design of each component facilitates maintenance and replacement, reducing long-term maintenance costs. The design of the easy-to-operate adjustment mechanism and the extraction point of the positioning tube improve operational convenience, reduce labor intensity for construction workers, and enhance user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of a fixed support device for a steel trestle provided by the utility model;

[0015] Figure 2 This is a schematic diagram of the main cross-sectional structure of a fixed support device for a steel trestle provided by the utility model;

[0016] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of part A shown in FIG.

[0017] Figure numerals: 1, column; 2, support frame; 3, cross bar; 4, positioning block; 5, adjusting sleeve; 6, fixing sleeve; 7, connecting rod; 8, positioning tube; 9, limiting groove; 10, limiting block; 11, through-port; 12, positioning groove; 13, positioning bolt; 14, positioning ring; 15, slide; 16, connecting tube; 17, fixing block; 18, bidirectional screw; 19, adjusting block; 20, support rod; 21, traction plate; 22, protrusion; 23, storage groove. DETAILED DESCRIPTION

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein in the specification of the application are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the description of the above-mentioned drawings, as well as any variations thereof, are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order; the terms "inside", "outside", "left", and "right" indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0019] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] The present invention provides a fixed support device for a steel trestle. Figure 1-3 As shown, the fixed support device of the steel trestle includes: two columns 1; two support frames 2, the two support frames 2 are respectively fixedly mounted on the two columns 1; a cross bar 3, the cross bar 3 is fixedly mounted on the two columns 1 and fixedly connected to the two support frames 2; two positioning blocks 4, the two positioning blocks 4 are respectively fixedly mounted on the two columns 1; two adjusting sleeves 5, the two adjusting sleeves 5 are respectively sleeved on the two columns 1 and fixedly connected to the two positioning blocks 4; two fixing sleeves 6, the two fixing sleeves 6 are respectively sleeved on the two columns 1; two connecting rods 7, the two connecting rods 7 are respectively hinged on the two adjusting sleeves 5 and the fixing sleeves 6, and are cross-arranged; two adjusting positioning mechanisms, the two adjusting positioning mechanisms are respectively arranged on the two adjusting sleeves 5, for positioning the distance between the adjusting sleeves 5 and the fixing sleeves 6.

[0021] In this embodiment, the column 1 serves as the basic structure of the support device. The column 1 bears the weight of the entire device and ensures the stability and safety of the device. Its design needs to consider sufficient strength and rigidity to cope with the load requirements under different environments and working conditions. The support frame 2 further enhances the stability of the support device. The design of the support frame 2 needs to be closely coordinated with the column 1 to ensure the stability and reliability of the overall structure. The crossbar 3 connects the two columns 1 and is fixedly connected to the support frame 2 to form a stable rectangular support frame. The addition of the crossbar 3 significantly improves the anti-roll capability of the support device and ensures the stability of the trestle under the action of lateral forces. The positioning block 4 serves as the reference point for the adjustment sleeve 5. The design of the positioning block 4 simplifies the installation and positioning process of the adjustment sleeve 5 and improves construction efficiency. The presence of the adjustment sleeve 5 allows the support device to adjust the height or angle according to actual needs, increasing the flexibility and adaptability of the device. At the same time, combined with the adjustment and positioning mechanism, the distance between the adjustment sleeve 5 and the fixed sleeve 6 can be precisely controlled to ensure the stability of the support device. The coordinated use of the fixed sleeve 6 and the adjustable sleeve 5 allows the support device to maintain stability while also achieving a certain degree of adjustment. The connecting rod 7 is hinged to the adjustable sleeve 5 and the fixed sleeve 6 and arranged in a cross pattern. The cross design of the connecting rod 7 not only enhances the stability of the support device, but also makes the entire structure more compact and efficient. The adjustment and positioning mechanism is used to precisely determine the distance between the adjustable sleeve 5 and the fixed sleeve 6. The presence of the adjustment and positioning mechanism makes the adjustment process of the support device more precise and convenient, reducing construction errors and delays.

[0022] In a further preferred embodiment of the present invention, the adjustment and positioning mechanism includes a positioning tube 8, a limiting groove 9, a limiting block 10, multiple through-ports 11, multiple positioning grooves 12 and a positioning bolt 13. The positioning tube 8 is slidably arranged in the adjusting sleeve 5 and conflicts with the column 1. The limiting groove 9 is opened in the adjusting sleeve 5. The limiting block 10 is fixedly installed on the positioning tube 8. The limiting block 10 is slidably connected to the limiting groove 9. Multiple through-ports 11 are opened on the adjusting sleeve 5 and are arranged corresponding to the limiting groove 9. Multiple positioning grooves 12 are opened on the column 1. Multiple positioning grooves 12 are respectively arranged corresponding to multiple through-ports 11. The positioning bolt 13 is inserted into any through-port 11 and connected to the corresponding positioning groove 12.

[0023] In this embodiment, the positioning tube 8 serves as the main moving component in the adjustment process, and its sliding property enables the adjusting sleeve 5 to be accurately adjusted in height or angle relative to the column 1. At the same time, the interference with the column 1 ensures stability after adjustment. The limiting groove 9 is used to accommodate and guide the sliding of the limiting block 10. The design of the limiting groove 9 limits the sliding path of the positioning tube 8, preventing it from deflecting or losing control during the adjustment process, thereby ensuring the accuracy and safety of the adjustment. The cooperation between the limiting block 10 and the limiting groove 9 realizes the stable sliding of the positioning tube 8 in the adjusting sleeve 5, and also provides the necessary resistance, making the adjustment process more stable and controllable. Multiple openings 11 serve as the insertion points of the positioning bolts 13, and the corresponding relationship between their positions and the limiting grooves 9 ensures that the positioning bolts 13 can be accurately inserted into the corresponding positioning grooves 12, thereby realizing a fixed connection between the positioning tube 8 and the column 1. The design of positioning groove 12 provides a secure insertion point for positioning pin 13. When positioning pin 13 passes through opening 11 and into positioning groove 12, the relative position between positioning tube 8 and adjustment sleeve 5 is securely locked, thereby achieving precise positioning of the support device. As a connecting member, positioning pin 13's quick insertion and removal makes the adjustment process more convenient and efficient. Furthermore, its sturdy material and structural design ensure a secure and reliable connection.

[0024] In a further preferred embodiment of the present invention, a positioning ring 14 is provided on the two columns 1, and a plurality of slide grooves 15 are opened on the positioning ring 14. A connecting pipe 16 is respectively provided on the two columns 1. The two connecting pipes 16 are arranged in the positioning ring 14 and are respectively slidably connected to the plurality of slide grooves 15. An operating mechanism is provided on the positioning ring 14 for adjusting the position between the two positioning rings 14.

[0025] In this embodiment, the positioning ring 14 serves as a load-bearing and guiding component for the connecting tube 16. A chute 15 is provided within the positioning ring 14 to accommodate and guide the sliding movement of the connecting tube 16. The sliding cooperation between the chute 15 and the connecting tube 16 not only ensures smooth adjustment of the relative position between the columns 1 but also ensures accuracy and controllability of the adjustment by limiting the sliding path. As a connecting member between the columns 1, the connecting tube 16 slides within the chute 15, enabling flexible adjustment of the relative position between the columns 1 while simultaneously providing support for the columns 1 in conjunction with the positioning ring 14. This design enables the support device to adapt to the needs of various working conditions, improving its versatility and adaptability. An operating mechanism is used to adjust the position between the two positioning rings 14, allowing the operator to quickly and accurately adjust the position of the positioning rings 14 while enhancing their support, thereby achieving precise control of the relative position between the columns 1. The chute 15 limits the sliding path of the connecting tube 16, ensuring accuracy and controllability of the adjustment process and avoiding construction errors and safety hazards caused by improper adjustment. The design of the operating mechanism makes the adjustment process more convenient and efficient, reduces the labor intensity and construction time of construction workers, and improves the overall construction efficiency.

[0026] In a further preferred embodiment of the present invention, the operating mechanism includes a fixed block 17, a bidirectional screw 18, two adjusting blocks 19, and four support rods 20. The fixed block 17 is fixedly mounted on the positioning ring 14, and the fixed block 17 is arranged between the two columns 1. The bidirectional screw 18 is rotatably mounted on the fixed block 17. The two adjusting blocks 19 are both threadedly mounted on the bidirectional screw 18. The four support rods 20 are respectively hinged between the two adjusting blocks 19 and the connecting pipe 16, and the four support rods 20 are arranged in a diamond shape.

[0027] In this embodiment, the fixed block 17 serves as the installation base of the entire operating mechanism. The setting of the fixed block 17 ensures that the operating mechanism can be firmly connected to the positioning ring 14, thereby achieving the adjustment of the relative position between the columns 1. The bidirectional screw 18 is rotatably mounted on the fixed block 17 and is the core component of the operating mechanism. The design of the bidirectional screw 18 allows the threads at both ends to move in opposite directions at the same time when rotating, thereby driving the two adjustment blocks 19 to move relative to or oppositely. The adjustment block 19 serves as the connection point of the support rod 20, and moves with the rotation of the bidirectional screw 18, thereby pushing or pulling the connecting pipe 16 to slide in the slide groove 15 through the support rod 20, thereby achieving the adjustment of the relative position between the columns 1. The diamond layout of the support rod 20 not only enhances the stability of its structure, but also enables the force balance to be maintained during the adjustment process, ensuring the smoothness and accuracy of the adjustment process. At the same time, the hinged design of the support rod 20 allows it to be adjusted in angle within a certain range to meet the needs of different working conditions. The rotation of the bidirectional screw 18 and the movement of the adjustment block 19 enable precise adjustment of the relative positions between the columns 1. This design avoids the accumulation of errors seen in traditional adjustment methods and improves adjustment accuracy. The diamond-shaped layout and articulated design of the support rods 20 enhance the stability of the operating mechanism, maintaining force balance and structural stability during the adjustment process, and avoiding safety hazards caused by improper adjustment. The design of the operating mechanism makes the adjustment process more convenient and efficient. The operator only needs to rotate the bidirectional screw 18 to complete the adjustment, significantly reducing construction time and labor intensity.

[0028] In a further preferred embodiment of the present invention, a traction plate 21 is fixedly installed between the two adjusting sleeves 5 and the two fixed sleeves 6 , the two traction plates 21 are arranged in parallel, and two connecting rods 7 are arranged between the two traction plates 21 .

[0029] In this embodiment, the traction plate 21, a key component connecting the adjustment sleeve 5 and the fixed sleeve 6, not only strengthens the connection but also, through its parallel arrangement, ensures the overall stability and rigidity of the support device when bearing loads. This design helps reduce deformation and displacement caused by loads, thereby improving the load-bearing capacity and service life of the support device. The connecting rod 7 further strengthens and stabilizes the support device. The addition of the connecting rod 7 further secures the connection between the traction plates 21, forming a stable frame structure. This structure more effectively distributes stress when bearing loads, avoiding damage caused by localized stress concentration. Furthermore, the connecting rod 7 increases the overall rigidity and torsional resistance of the support device, ensuring stable support even under complex operating conditions. This enhanced structural stability and increased load-bearing capacity help reduce wear and damage to the support device during use, thereby extending its service life. This not only reduces maintenance costs for users but also improves the economic benefits of the entire project.

[0030] In a further preferred embodiment of the present invention, a protrusion 22 is fixedly installed on each of the two positioning tubes 8 for pulling the positioning tube 8 out of the adjusting sleeve 5, and a receiving groove 23 is provided on each of the two adjusting sleeves 5, and the two receiving grooves 23 are respectively arranged corresponding to the two protrusions 22.

[0031] In this embodiment, the protrusion 22 serves as the operating point for extracting the positioning tube 8. The design of the protrusion 22 enables the user to easily grasp and apply force to extract the positioning tube 8 from the adjusting sleeve 5. This design not only improves the convenience of operation, but also reduces the risk of damage caused by improper operation. When the positioning tube 8 is fully inserted into the adjusting sleeve 5, the protrusion 22 will naturally embed into the receiving groove 23. This design not only plays a positioning role, ensuring the accuracy of the positioning tube 8 during the insertion process, but also makes the support device more neat and beautiful in appearance. At the same time, the receiving groove 23 also provides an avoidance space for the protrusion 22, avoiding unnecessary friction and collision with the adjusting sleeve 5 when extracting the positioning tube 8. The design of the protrusion 22 makes the extraction operation of the positioning tube 8 more convenient and quick, reducing the user's operating difficulty and time cost.

[0032] In a further preferred embodiment of the present invention, the adjusting block 19 is composed of a threaded block and two mounting blocks, the threaded block is threadedly mounted on the bidirectional screw 18, the two mounting blocks are respectively fixedly mounted on both sides of the threaded block, and the two mounting blocks are respectively hinged to the two support rods 20.

[0033] In this embodiment, the threaded block serves as the main part of the adjustment block 19, and the threaded block is designed to be threadedly mounted on the bidirectional screw 18. This design enables the threaded block to move along its axial direction as the bidirectional screw 18 rotates, thereby adjusting the relative positions between the columns 1. There are two mounting blocks, which are fixedly mounted on both sides of the threaded block. These two mounting blocks serve as connection points for hinged connection with the support rod 20. The design of the mounting block ensures that the support rod 20 can be firmly connected to the adjustment block 19 and adjusted accordingly as the adjustment block 19 moves. Since the threaded block and the bidirectional screw 18 are threadedly connected, the relative positions between the columns 1 can be accurately adjusted by precisely controlling the rotation angle of the bidirectional screw 18. This design avoids the error accumulation in the traditional adjustment method and improves the adjustment accuracy.

[0034] In summary, compared to related technologies, this device, through its adjustable support device design, specifically the coordinated use of adjustable and fixed sleeves, and its bidirectional screw-driven adjustment mechanism, allows for flexible adjustment of support height and angle to suit varying working conditions and requirements, enhancing flexibility and adaptability during construction. The robust connection of components such as the columns, support frame, crossbar, and connecting rods creates a stable support framework, enhancing the overall structural stability and roll resistance. Furthermore, the precise adjustment and positioning mechanism ensures the stability and safety of the support device during use. Through its optimized design and convenient adjustment mechanism, this device reduces installation and disassembly inconvenience, lowering construction costs. Furthermore, precise adjustment and positioning minimize construction errors and delays, improving overall construction efficiency. This device's design takes into account a variety of application scenarios and working conditions, resulting in high versatility. Furthermore, the design of each component facilitates maintenance and replacement, reducing long-term maintenance costs. By designing an easily accessible adjustment mechanism and a convenient point for extracting the positioning tube, this device improves ease of operation, reduces labor intensity for construction workers, and enhances user experience.

[0035] In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope to be protected by the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making any creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also fall within the scope to be protected by the present invention.

Claims

1. A fixed support device for a steel trestle, characterized in that: include: two uprights; Two support frames, the two support frames are fixedly mounted on the two columns respectively; A crossbar, the crossbar being fixedly mounted on the two uprights and fixedly connected to the two support frames; Two positioning blocks, the two positioning blocks are fixedly mounted on the two columns respectively; Two adjusting sleeves, the two adjusting sleeves are respectively sleeved on the two upright posts and respectively fixedly connected to the two positioning blocks; Two fixed sleeves, the two fixed sleeves are respectively sleeved on the two columns; Two connecting rods, the two connecting rods are respectively hinged to the two adjusting sleeves and the fixed sleeve, and are arranged in a cross pattern; Two adjusting and positioning mechanisms are respectively arranged on the two adjusting sleeves and are used to locate the distance between the adjusting sleeve and the fixed sleeve.

2. The fixed support device for a steel trestle according to claim 1, characterized in that: The adjustment and positioning mechanism includes a positioning tube, a limiting groove, a limiting block, multiple through-ports, multiple positioning grooves and a positioning bolt. The positioning tube is slidably arranged in the adjustment sleeve and conflicts with the column. The limiting groove is opened in the adjustment sleeve. The limiting block is fixedly installed on the positioning tube. The limiting block is slidably connected to the limiting groove. Multiple through-ports are opened on the adjustment sleeve and corresponding to the limiting grooves. Multiple positioning grooves are opened on the column. Multiple positioning grooves are respectively corresponding to multiple through-ports. The positioning bolt is inserted into any through-port and connected to the corresponding positioning groove.

3. The fixed support device for a steel trestle according to claim 1, characterized in that: The two columns are sleeved with positioning rings, and a plurality of sliding grooves are opened on the positioning rings. The two columns are respectively sleeved with connecting pipes, and the two connecting pipes are arranged in the positioning rings and are respectively slidably connected to the plurality of sliding grooves. The positioning rings are provided with an operating mechanism for adjusting the position between the two positioning rings.

4. The fixed support device for a steel trestle according to claim 3, characterized in that: The operating mechanism includes a fixed block, a bidirectional screw, two adjusting blocks, and four support rods. The fixed block is fixedly mounted on the positioning ring, the fixed block is arranged between the two columns, the bidirectional screw is rotatably mounted on the fixed block, the two adjusting blocks are both threadedly mounted on the bidirectional screw, and the four support rods are respectively hinged between the two adjusting blocks and the connecting pipe, and the four support rods are arranged in a diamond shape.

5. The fixed support device for a steel trestle according to claim 1, characterized in that: A traction plate is fixedly installed between the two adjusting sleeves and the two fixing sleeves. The two traction plates are arranged in parallel, and two connecting rods are arranged between the two traction plates.

6. The fixed support device for a steel trestle according to claim 2, characterized in that: The two positioning tubes are both fixedly mounted with protrusions for pulling the positioning tubes out of the adjusting sleeves. The two adjusting sleeves are both provided with receiving grooves, and the two receiving grooves are respectively arranged corresponding to the two protrusions.

7. The fixed support device for a steel trestle according to claim 4, characterized in that: The adjusting block is composed of a threaded block and two mounting blocks. The threaded block is threadedly mounted on the bidirectional screw. The two mounting blocks are respectively fixedly mounted on both sides of the threaded block. The two mounting blocks are respectively hinged to the two support rods.

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