Bridge steel truss connecting structure

Abstract

The utility model discloses a bridge steel truss connecting structure and a loose core bolt assembly for connecting bridge steel trusses. Two steel trusses are fixedly connected through bolts and loose cores. Wherein a loose core channel is formed in the bolt, the loose core comprises a loose core main body and an easy-to-deform fastener, the loose core main body is inserted into the loose core channel and is in interference fit with the bolt, and at the moment, the tail end of the bolt has deformability; during on-site construction, the core pulling main body can be pulled out of the bolt by using a riveting gun, so that the easily-deformed fastener deforms and is pressed on the outer side of the nut, the fastening function of the bolt is enhanced, the bolt is connected more firmly, and meanwhile, the stability of the bolt in a high-strength vibration environment can be effectively improved; the problem that the bolts are loosened or fall off due to vibration is solved, and then the safety of the overall structure of the bridge steel truss is improved; and after being fixed by the bolts, the bolt is easy to disassemble and assemble and can be repeatedly used, so that adjustment and maintenance in the construction process are facilitated, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering bridge construction, in particular to a bridge steel truss connection structure and a core-pulling bolt assembly for connecting the bridge steel truss. Background Art

[0002] In recent years, with the rapid development of my country's economy and society, higher requirements have been put forward for the construction of various infrastructures; among them, road bridges, as a kind of infrastructure for daily use, need to meet high quality, high standards and high requirements. At present, due to the good overall structural stability of steel truss bridges, they can withstand large loads and ensure driving safety, and they are fast to build. They can be built in a short time using modern construction technology and equipment, so steel truss bridges have been widely used in the field of bridge construction in my country.

[0003] In order to ensure the quality of bridge construction and improve construction efficiency, it is necessary to continuously optimize construction technology and methods. Bolt connection has the advantages of low cost, short construction period, strong interchangeability, and easy operation and construction by workers. Compared with other bridge connection technologies such as welding, it has great advantages in the construction process, so it has become a commonly used connection technology for steel trusses in bridge construction. However, in the current steel truss construction process, there are still many potential problems in the use of bolt connections, including the following aspects: 1. During the normal use of the bridge, the bolts may loosen or even fall off, posing a safety hazard; 2. After the bolts are installed, their installation quality cannot be checked accordingly. Utility Model Content

[0004] The present application provides a bridge steel truss connection structure to overcome the above-mentioned problems existing in the prior art. The bridge steel truss connection structure of the present application is provided by opening a core-pulling channel inside the bolt and setting a core-pulling channel matched with the core-pulling channel, wherein the end of the core-pulling channel is provided with a deformable fastener, so that the end of the bolt has a deformable ability, strengthens the fastening function of the bolt, and makes the bolt connection more firm. At the same time, it can also effectively improve the stability of the bolt in a high-intensity vibration environment, prevent the bolt from loosening or falling off due to vibration, and thus improve the safety of the overall structure of the bridge steel truss; and after the bolt is fixed, it is easy to disassemble and assemble, and can be reused, which is conducive to adjustment and maintenance during the construction process, reducing costs. In addition, a special installation quality detection device can also be used to detect the installation quality of the bolt through the core-pulling channel, thereby improving the operability of subsequent maintenance. Correspondingly, the present application also provides a core-pulling bolt assembly for connecting a bridge steel truss.

[0005] For the connection structure, the technical solution of this application is:

[0006] A bridge steel truss connection structure comprises a first steel truss and a second steel truss; the first steel truss and the second steel truss are connected and fixed by a core-pulling bolt assembly; the core-pulling bolt assembly comprises a bolt and a core-pulling bolt; a core-pulling channel is provided inside the bolt; the core-pulling bolt comprises a core-pulling body and a deformable fastener fixed to the end of the core-pulling body; the bolt passes through the mounting holes on the first steel truss and the second steel truss in turn, and is locked and fixed by a nut; the core-pulling body is inserted into the core-pulling channel and has an interference fit with the bolt; the end face of the deformable fastener is against the end of the bolt; during on-site construction, a rivet gun is used to pull the core-pulling body out of the bolt, compress the deformable fastener, deform it and press it against the outside of the nut.

[0007] Compared with the prior art, in the bridge steel truss connection structure of the present application, the two steel trusses are fixed by bolts and core pulling, wherein a core pulling channel is opened inside the bolt, and the core pulling includes a core pulling body and an easily deformable fastener arranged at its end, and the core pulling body cooperates with the core pulling channel, so that the end of the bolt has deformability; during on-site construction, a rivet gun can be used to pull the core pulling body out of the bolt, at this time, the easily deformable fastener will deform under pressure and be pressed against the outside of the nut, thereby strengthening the fastening function of the bolt, making the bolt connection more secure, and at the same time, it can effectively improve the stability of the bolt in a high-intensity vibration environment, prevent the bolt from loosening or falling off due to vibration, and thereby improve the safety of the overall structure of the bridge steel truss; and after the core pulling bolt assembly is fixed, it is easy to disassemble and assemble, and can be reused, which is beneficial to adjustment and maintenance during construction and reduces costs.

[0008] As an optimization, in the aforementioned bridge steel truss connection structure, the inner diameter of the lower end of the bolt is 1 to 2 mm smaller than the inner diameter of the upper end; the diameter of the deformable fastener is 1 to 2 mm larger than the inner diameter of the lower end of the bolt. This size difference allows the deformable fastener and the bolt to use friction to ensure a tight connection between the two.

[0009] As an optimization, in the aforementioned bridge steel truss connection structure, a gasket is provided between the head of the bolt and the first steel truss. The provision of the gasket can, on the one hand, play a role in preventing loosening, further improving the tightening force of the bolt, and on the other hand, can avoid direct contact between the bolt head and the steel truss, so that the surface of the steel truss will not be scratched when the bolt is tightened, thereby improving its service life.

[0010] As an optimization, in the aforementioned bridge steel truss connection structure, the diameter of the core pulling body is 2 to 4 mm larger than the diameter of the core pulling channel. At this time, both the tight connection between the core pulling body and the bolt can be achieved and the core pulling body can move in the core pulling channel in the bolt, thereby ensuring the smooth progress of the core pulling action.

[0011] Furthermore, the head of the core-pulling body is hemispherical. At this time, the connection area between the core-pulling body and the easily deformable fastener is small, so that the connection between the core-pulling body and the easily deformable fastener is easy to break during the core pulling, ensuring that the core-pulling body can be completely pulled out.

[0012] Furthermore, the deformable fastener is cylindrical, and the end surface is an arc surface. In this case, the structure is simple and easy to manufacture.

[0013] As an optimization, in the aforementioned bridge steel truss connection structure, the bolts are made of high carbon steel and the core pullers are made of sapphire. High carbon steel has excellent strength and hardness characteristics, which can ensure the safety and reliability of the bolts when used; sapphire has excellent ductility and plasticity, which is suitable for parts that need to bend and deform, so that when the core is pulled, the deformable fasteners are more easily compressed and deformed. The specific material combination of the bolt and the core puller ensures the reliability of the core puller bolt assembly and can meet the requirements of various engineering performances.

[0014] For the core-pulling bolt assembly, the technical solution of this application is:

[0015] A core-pulling bolt assembly for connecting bridge steel trusses comprises a bolt and a core-pulling bolt; a core-pulling channel is provided inside the bolt; the core-pulling bolt comprises a core-pulling bolt body and a deformable fastener fixed to the end of the core-pulling bolt body; the diameter of the core-pulling bolt body is larger than the diameter of the core-pulling bolt channel; when in use, the bolt passes through the mounting holes on the first steel truss and the second steel truss in turn, and is tightened and fixed by a nut; the core-pulling bolt body is inserted into the core-pulling bolt channel and has an interference fit with the bolt, and the end face of the deformable fastener abuts against the end of the bolt; after the core-pulling bolt body is pulled out, the deformable fastener is compressed, deformed and pressed against the outside of the nut, thereby achieving the connection and fixation of the first steel truss and the second steel truss.

[0016] Compared with the prior art, the core-pulling bolt assembly for connecting bridge steel trusses of the present application includes a bolt and a core-pulling bolt. A core-pulling channel is opened inside the bolt. The core-pulling bolt includes a core-pulling body matched with the core-pulling channel and a deformable fastener arranged at the end of the core-pulling body, so that the end of the bolt has deformable ability, which strengthens the fastening function of the bolt and makes the bolt connection more secure. At the same time, it can also effectively improve the stability of the bolt in a high-intensity vibration environment and prevent the bolt from loosening or falling off due to vibration, thereby improving the safety of the bridge steel truss connection structure; in addition, a special installation quality detection device can be used to detect the installation quality of the bolt through the core-pulling channel, thereby improving the operability of subsequent maintenance.

[0017] As an optimization, in the aforementioned core-pulling bolt assembly for connecting bridge steel trusses, the inner diameter of the lower end of the bolt is 1 to 2 mm smaller than the inner diameter of the upper end; the diameter of the deformable fastener is 1 to 2 mm larger than the inner diameter of the lower end of the bolt. This size difference makes the connection between the deformable fastener and the bolt tighter and has high reliability in use. Furthermore, the bolt is made of high-carbon steel, and the core-pulling bolt is made of Saigang. Saigang has excellent ductility and plasticity, and is suitable for parts that need to bend and deform; high-carbon steel can ensure its safety and reliability during the bolt assembly process, and has excellent strength and hardness characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the bridge steel truss connection structure of the present application;

[0019] Figure 2 yes Figure 1 The main view of the bridge steel truss connection structure;

[0020] Figure 3 yes Figure 2 AA section view in the figure;

[0021] Figure 4 It is a schematic diagram of the bridge steel truss connection structure after core extraction of the present application;

[0022] Figure 5 yes Figure 4 BB section view in the figure;

[0023] Figure 6 It is a schematic diagram of the installation quality detection device in this application.

[0024] The markings in the attached drawings are: 1-first steel truss; 2-second steel truss; 3-bolt, 301-core pulling channel; 4-core pulling, 41-core pulling body, 42-deformable fastener; 5-nut; 6-gasket; 7-metal probe; 8-microcomputer analyzer. DETAILED DESCRIPTION

[0025] The present application is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present application.

[0026] Since ordinary bolts used in the prior art for connecting bridge steel trusses may become loose or even fall off during use, and the installation quality of the bolts cannot be checked accordingly after they are installed, the present application provides a pull-out bolt assembly for connecting bridge steel trusses, by opening a pull-out channel 301 inside the bolt 3, and providing a pull-out channel 4 that matches the pull-out channel 301, and providing a deformable fastener 41 at the end of the pull-out channel 4, so that the end of the bolt has deformability, thereby enhancing the fastening ability and installation stability of the bolt, and at the same time, the installation quality of the bolt can be judged by checking whether there are cracks in the pull-out channel 301.

[0027] Example (see Figure 1 to Figure 3 ):

[0028] The core-pulling bolt assembly for connecting the bridge steel trusses in this embodiment includes a bolt 3 and a core-pulling bolt 4; a core-pulling channel 301 is opened inside the bolt 3; the core-pulling bolt 4 includes a core-pulling body 41 and a deformable fastener 42 fixed to the end of the core-pulling body 41; the diameter of the core-pulling body 41 is larger than the diameter of the core-pulling channel 301; the inner diameter of the lower end of the bolt 3 is 1.5 mm smaller than the inner diameter of the upper end; the diameter of the deformable fastener 42 is 1.5 mm larger than the inner diameter of the lower end of the bolt 3; the diameter of the core-pulling body 41 is 3 mm larger than the diameter of the core-pulling channel 301.

[0029] In this embodiment, the head of the core pulling body 41 is hemispherical; the deformable fastener 42 is cylindrical, and the end face is an arc surface; the bolt 3 is made of high carbon steel, and the core pulling body 4 is made of Saigang steel.

[0030] When in use, place a gasket 6 (in this embodiment, the gasket 6 has a diameter of 22 mm and a thickness of 2.5 mm) above the mounting hole of the first steel truss 1, and tighten the bolt 3 (in this embodiment, the diameter is 20 mm) through the gasket 6, the mounting holes on the first steel truss 1 and the second steel truss 2 (the mounting holes on the steel trusses are threaded holes), and fasten them with the nut 5. Then, insert the core pulling body 41 into the core pulling channel 301, and fit it with the bolt 3 in an interference fit. The end face of the deformable fastener 42 is against the end of the bolt 3 to form a bridge steel truss connection structure.

[0031] Then, use a rivet gun to pull the core pulling body 41 out of the bolt 3; at this time, the easily deformed fastener 42 at the end of the core pulling body 41 will be deformed under the action of pressure, thereby being pressed against the outside of the nut 5. When the core pulling reaches a certain degree, the thin part between the end of the core pulling body 41 and the easily deformed fastener 42 will break, so that the core pulling body 41 is completely pulled out, that is, the connection and fixation between the two steel trusses is completed (part of the easily deformed fastener 42 will be drawn into the core pulling channel 301 in the bolt 3, and will be interference fit with the bolt 3).

[0032] After the bolt is installed, a dedicated installation quality detection device can be used to detect the installation quality of the bolt. The installation quality detection device includes a metal probe 7 and a microcomputer analyzer 8 (the microcomputer analyzer includes a microprocessor, a storage device, a display screen, a data acquisition interface, a data analysis software, a communication interface, a power module, etc., and can be worn around the waist or carried in a pocket); the metal probe 7 is provided with an ultrasonic transmitter and an ultrasonic receiver; the outer diameter of the detection end of the metal probe 7 is 5-10mm smaller than the inner diameter of the core pulling channel 301 to ensure that the detection end can be smoothly inserted into the core pulling channel 301. After the core pulling is completed, the detection end of the metal probe 7 is carefully inserted into the core pulling channel 301, and the ultrasonic transmitter emits ultrasonic waves to detect the inside of the bolt 3; the ultrasonic receiver receives the reflected ultrasonic signal in real time and converts it into an electrical signal and sends it to the microcomputer analyzer 8; the microcomputer analyzer 8 generates a corresponding image or graph by analyzing the frequency of the ultrasonic wave to determine whether there is a crack in the bolt 3 and whether the installation quality of the bolt 3 is qualified.

[0033] When the bolt 3 needs to be removed, the head of the bolt 3 is rotated with an electric torque wrench or a pneumatic torque wrench, and the bolt 3 is gradually unscrewed counterclockwise. The deformable fastener 42 below cannot move due to the limiting effect of the nut 5, and is eventually forced to detach from the bolt 3; as the bolt 3 is unscrewed counterclockwise, the nut 5 will also loosen and eventually fall off, thereby separating the bolt 3 and the nut 5. The deformable fastener 42 is a consumable material, which can be removed from the used bolt 3 and re-inserted onto other bolts 3 to achieve its recycling and reduce costs.

[0034] The above general description of the utility model involved in this application and the description of its specific implementation method should not be understood as limiting the technical solution of the utility model. Based on the disclosure of this application, those skilled in the art can add, reduce or combine the disclosed technical features in the above general description or / and the specific implementation method (including examples) without violating the constituent elements of the utility model involved, to form other technical solutions within the scope of protection of this application.

Claims

1. Bridge steel truss connection structure, characterized by: The invention comprises a first steel truss (1) and a second steel truss (2); the first steel truss (1) and the second steel truss (2) are connected and fixed by a core-pulling bolt assembly; the core-pulling bolt assembly comprises a bolt (3) and a core-pulling bolt (4); a core-pulling passage (301) is provided inside the bolt (3); the core-pulling bolt (4) comprises a core-pulling bolt body (41) and a deformable fastener (42) fixed to the end of the core-pulling bolt body (41); the bolt (3) passes through the mounting holes on the first steel truss (1) and the second steel truss (2) in turn, and is locked and fixed by a nut (5); the core-pulling bolt body (41) is inserted into the core-pulling passage (301) and is interference-fitted with the bolt (3); the end face of the deformable fastener (42) is against the end of the bolt (3); during on-site construction, a rivet gun is used to pull the core-pulling bolt body (41) out of the bolt (3), compress the deformable fastener (42), deform it and press it against the outside of the nut (5).

2. The bridge steel truss connection structure according to claim 1, characterized in that: The inner diameter of the lower end of the bolt (3) is 1 to 2 mm smaller than the inner diameter of the upper end; the diameter of the deformable fastener (42) is 1 to 2 mm larger than the inner diameter of the lower end of the bolt (3).

3. The bridge steel truss connection structure according to claim 1, characterized in that: A gasket (6) is provided between the head of the bolt (3) and the first steel truss (1).

4. The bridge steel truss connection structure according to claim 1, characterized in that: The diameter of the core-pulling body (41) is 2 to 4 mm larger than the diameter of the core-pulling channel (301).

5. The bridge steel truss connection structure according to claim 4, characterized in that: The head of the core-pulling body (41) is hemispherical.

6. The bridge steel truss connection structure according to claim 5, characterized in that: The deformable fastener (42) is cylindrical, and its end surface is an arc-shaped surface.

7. The bridge steel truss connection structure according to claim 1, characterized in that: The bolt (3) is made of high carbon steel, and the core puller (4) is made of Saigang steel.

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