Large-span truss support capable of preventing lower chord member at end of truss from deforming

Abstract

The large-span truss support comprises an upper chord, a steel corbel and a steel column, a plurality of first diagonal web members are evenly and fixedly installed at the bottom end of the upper chord, the lower chord is fixedly installed at the bottom ends of the first diagonal web members, one end of the bottom end of the lower chord is placed at the top end of the steel corbel, and the other end of the bottom end of the lower chord is placed at the bottom end of the steel corbel. The large-span truss support comprises a steel column and a steel corbel, the steel corbel is fixedly installed at the top of the steel column, a vertical web member is fixedly installed at the position, between every two adjacent first diagonal web members, of the bottom end of the upper chord, a second diagonal web member is fixedly installed at one end of the bottom end of the upper chord, and an installation shell is fixedly installed at the top end of the steel corbel. The two-way diagonal web members are arranged in the support grids on the two sides of the truss, so that the lower chord steel in the grids on the two sides of the truss is converted into a tension and compression stress state from a bending stress state in the installation process, and bending deformation of the lower chord members at the ends caused by too large self weight of the truss is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of truss supports, in particular to a large-span truss support for preventing deformation of a lower chord at a truss end. Background Art

[0002] In the petrochemical industry, large-span trusses across rivers or roads are often found.

[0003] Generally, large-span trusses are assembled on the ground and then hoisted and installed in place by a large-tonnage crane. However, the existing large-span trusses have the following disadvantages during installation:

[0004] (1) During the installation of a large-span truss, the steel sections on both sides of the lower chord of the truss are bending members, and the crane cannot release the tension, otherwise the lower chord rod at the end of the truss will be bent and deformed. This process takes 1-2 hours, and the crane can only release the tension after the splicing nodes between the truss and the steel columns on both sides are installed, which increases energy consumption;

[0005] (2) During the installation of large-span trusses, they are hoisted and installed by crane, which causes them to swing easily during installation and have poor stability. Utility Model Content

[0006] The utility model aims to provide a large-span truss support which can prevent the lower chord of the truss end from deforming, so as to solve the existing problems mentioned in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a large-span truss support for preventing the deformation of the lower chord at the end of the truss, comprising an upper chord, a steel corbel and a steel column, the bottom end of the upper chord is evenly fixedly installed with a plurality of diagonal web members 1, the bottom ends of the plurality of diagonal web members 1 are fixedly installed with a lower chord, one end of the bottom end of the lower chord is placed on the top end of the steel corbel, the steel corbel is fixedly installed on the top of the steel column, the bottom end of the upper chord is located between each two adjacent diagonal web members 1 and a vertical web member is fixedly installed, one end of the bottom end of the upper chord is fixedly installed with a diagonal web member 2, the top end of the steel corbel is fixedly installed with a mounting shell, both sides of the inner wall of the mounting shell are rotatably connected with threaded rods through bearings, both sides of the surface of the threaded rod are threadedly sleeved with displacement cylinders, and the top ends of the two displacement cylinders are fixedly connected with limiting members.

[0008] When a large-span truss support of the present technical solution is used to prevent deformation of the lower chord at the end of the truss, bidirectional diagonal webs are arranged in the support areas on both sides of the truss, so that the lower chord steel in the areas on both sides of the truss is transformed from a bending stress state to a tension and compression stress state during installation, thereby avoiding bending deformation of the lower chord at the end caused by the excessive dead weight of the truss.

[0009] As a preferred technical solution of the utility model, the bottom end of the vertical web member and the bottom end of the second diagonal web member are both fixedly connected to the lower chord. The vertical web member plays a supporting role.

[0010] As a preferred technical solution of the utility model, the diagonal web member 2 is arranged in the opposite direction to the diagonal web member 1. The bidirectional diagonal web members are arranged so that the lower chord steel in the two sides of the truss is transformed from a bending stress state to a tension and compression stress state during the installation process.

[0011] As a preferred technical solution of the utility model, one end of the threaded rod passes through the outer wall of the mounting shell and is fixedly connected to a rotating member. The rotating member is provided to facilitate the rotation of the threaded rod.

[0012] As a preferred technical solution of the utility model, the threads on both sides of the threaded rod surface are in opposite directions, and the displacement cylinders on both sides of the threaded rod surface can move in opposite directions.

[0013] As a preferred technical solution of the utility model, the bottom end of the inner wall of the installation shell is fixedly connected with a slide rail, the bottom ends of the two displacement cylinders are fixedly connected with sliders, and the bottoms of the sliders are slidably connected with the slide rails. The sliders and the slide rails guide the movement of the displacement cylinders.

[0014] As a preferred technical solution of the utility model, a moving opening is provided at the top of the installation shell, and the moving opening provides space for the movement of the limiting member.

[0015] As a preferred technical solution of the utility model, the two opposite sides of the two limit members are fixedly connected with rubber pads, and the rubber pads play a role of collision buffering.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. By setting bidirectional diagonal web members in the support areas on both sides of the truss, the lower chord steel in the areas on both sides of the truss is transformed from a bending stress state to a tension and compression stress state during the installation process, avoiding the bending deformation of the lower chord at the end caused by the heavy weight of the truss. The crane rope can be lifted to release the tension for installation, achieving the purpose of energy saving and emission reduction;

[0018] 2. By setting two limiters at the steel corbels where the truss is placed, the rotating parts can be rotated to drive the limiters on both sides to move horizontally in opposite directions and adjust the positions, so as to limit the ends of the lower chord steel of the truss to prevent swinging and sliding during installation and improve stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2It is a structural schematic diagram of the steel bracket of the utility model;

[0021] Figure 3 It is a cross-sectional view of the installation shell of the utility model.

[0022] In the figure: 1. upper chord; 2. vertical web; 3. lower chord; 4. diagonal web one; 5. diagonal web two; 6. steel column; 7. steel corbel; 8. mounting shell; 9. bearing; 10. threaded rod; 11. displacement cylinder; 12. limiter; 13. rubber pad; 14. moving port; 15. rotating part; 16. slider; 17. slide rail. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-3 The utility model provides a large-span truss support for preventing the deformation of the lower chord at the end of the truss, comprising an upper chord rod 1, a steel corbel 7 and a steel column 6. The bottom end of the upper chord rod 1 is evenly fixed with a plurality of diagonal web rods 4, and the bottom ends of the plurality of diagonal web rods 4 are fixedly installed with a lower chord rod 3. One end of the bottom end of the lower chord rod 3 is placed on the top of the steel corbel 7. The steel corbel 7 is fixedly installed on the top of the steel column 6 for placing the truss. The bottom end of the upper chord rod 1 is located between each two adjacent diagonal web rods 4 and a vertical web rod 2 is fixedly installed. One end of the bottom end of the upper chord rod 1 is fixedly installed with a diagonal web rod 2 5, which plays a supporting role. The top end of the steel corbel 7 is fixedly installed with a mounting shell 8. The two sides of the inner wall of the mounting shell 8 are rotatably connected with threaded rods 10 through bearings 9. Displacement cylinders 11 are threadedly sleeved on both sides of the surface of the threaded rod 10. The top ends of the two displacement cylinders 11 are fixedly connected with limiting members 12 for limiting the position of the truss during installation.

[0025] When in use, steel corbels 7 are arranged on the steel columns 6 on both sides of the truss. The entire truss can be placed on the steel corbels 7 during installation. The dead weight of the truss is borne by the steel corbels 7 instead of the crane ropes, and the lower chord 3 at the end will not be subjected to bending deformation.

[0026] The bottom ends of the vertical web members 2 and the second diagonal web member 5 are both fixedly connected to the lower chord member 3 , and the second diagonal web member 5 and the first diagonal web member 4 are arranged in the opposite direction.

[0027] When in use, several diagonal web members 4 and vertical web members 2 play a supporting role in the truss. By arranging bidirectional diagonal web members in the support areas on both sides of the truss, the lower chord steel in the areas on both sides of the truss is transformed from a bending stress state to a tension and compression stress state during installation, thereby avoiding bending deformation of the lower chord member 3 at the end due to the excessive dead weight of the truss.

[0028] One end of the threaded rod 10 passes through the outer wall of the mounting shell 8 and is fixedly connected to a rotating part 15 for easy operation. The threads on both sides of the surface of the threaded rod 10 are in opposite directions. The bottom end of the inner wall of the mounting shell 8 is fixedly connected to a slide rail 17. The bottom ends of the two displacement cylinders 11 are fixedly connected to sliders 16, and the bottoms of the sliders 16 are slidably connected to the slide rails 17 to play a guiding role. A moving opening 14 is opened at the top of the mounting shell 8 to provide moving space. The opposite sides of the two limit members 12 are fixedly connected to rubber pads 13 to play a buffering role.

[0029] When in use, two limit members 12 are arranged at the steel corbels 7 where the truss is placed, and the rotatable rotating member 15 can drive the threaded rod 10 to rotate. Since the two sides of the surface of the threaded rod 10 have opposite thread directions, and under the guidance of the slider 16 and the slide rail 17, the limit members 12 on both sides can move horizontally in opposite directions at the moving opening 14, and adjust the position to limit the end of the lower chord steel of the truss. The rubber pad 13 can reduce the collision damage between the truss and the limit member 12.

[0030] In specific use, the utility model provides a large-span truss support for preventing the deformation of the lower chord at the end of the truss. Steel brackets 7 are arranged on the steel columns 6 on both sides of the truss. During installation, the entire truss can be placed on the steel brackets 7, and the deadweight of the truss is borne by the steel brackets 7 instead of the crane ropes. By arranging bidirectional diagonal webs in the support areas on both sides of the truss, the lower chord steel in the areas on both sides of the truss is transformed from a bending stress state to a tension and compression stress state during installation, thereby avoiding bending of the lower chord 3 at the end caused by the excessive deadweight of the truss. Deformation, the crane rope can be lifted to release the tension for installation, so as to achieve the purpose of energy saving and emission reduction. By arranging two limit members 12 at the steel bracket 7 where the truss is placed, the rotatable rotating member 15 can drive the threaded rod 10 to rotate. Since the two sides of the surface of the threaded rod 10 have opposite thread directions, and under the guidance of the slider 16 and the slide rail 17, the limit members 12 on both sides can move horizontally in opposite directions and adjust the position, so as to limit the end of the lower chord steel of the truss to prevent swinging and sliding during installation and improve stability.

[0031] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A large-span truss support for preventing deformation of the lower chord at the end of the truss, comprising an upper chord (1), a steel corbel (7) and a steel column (6), characterized in that: The bottom end of the upper chord rod (1) is evenly fixedly installed with a plurality of diagonal web rods (4), and the bottom ends of the plurality of diagonal web rods (4) are fixedly installed with lower chord rods (3). One end of the bottom end of the lower chord rod (3) is placed on the top end of a steel corbel (7), and the steel corbel (7) is fixedly installed on the top of a steel column (6). The bottom end of the upper chord rod (1) is located between each two adjacent diagonal web rods (4) and is fixedly installed with a vertical web rod (2). One end of the bottom end of the upper chord rod (1) is fixedly installed with a diagonal web rod (5). The top end of the steel corbel (7) is fixedly installed with a mounting shell (8). The inner walls of the mounting shell (8) are rotatably connected to threaded rods (10) on both sides through bearings (9). Displacement cylinders (11) are threadedly sleeved on both sides of the surface of the threaded rod (10), and the top ends of the two displacement cylinders (11) are fixedly connected to limiting members (12).

2. A large-span truss support for preventing deformation of the lower chord at the end of a truss according to claim 1, characterized in that: The bottom ends of the vertical web members (2) and the second diagonal web member (5) are both fixedly connected to the lower chord member (3).

3. A large-span truss support for preventing deformation of the lower chord at the end of a truss according to claim 1, characterized in that: The second diagonal brace (5) is arranged in the opposite direction to the first diagonal brace (4).

4. A large-span truss support for preventing deformation of the lower chord at the end of a truss according to claim 1, characterized in that: One end of the threaded rod (10) passes through the outer wall of the mounting shell (8) and is fixedly connected to a rotating member (15).

5. A large-span truss support for preventing deformation of the lower chord at the end of a truss according to claim 1, characterized in that: The threads on both sides of the surface of the threaded rod (10) are in opposite directions.

6. A large-span truss support for preventing deformation of the lower chord at the end of a truss according to claim 1, characterized in that: The bottom end of the inner wall of the mounting shell (8) is fixedly connected to a slide rail (17), the bottom ends of the two displacement cylinders (11) are fixedly connected to sliders (16), and the bottoms of the sliders (16) are slidably connected to the slide rail (17).

7. A large-span truss support for preventing deformation of the lower chord at the end of a truss according to claim 1, characterized in that: The top end of the installation shell (8) is provided with a moving opening (14).

8. A large-span truss support for preventing deformation of the lower chord at the end of a truss according to claim 1, characterized in that: The opposite sides of the two limiting members (12) are both fixedly connected with rubber pads (13).

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