A lightweight, plug-in prefabricated joint for large-span steel structures and its application method

Abstract

This application discloses a lightweight, prefabricated, plug-in type joint for large-span steel structures and its usage method. The joint includes support piles and steel truss beam units. Each steel truss beam unit comprises connected steel trusses, with a plug-in block at one end. The other ends of the two steel trusses are connected by a sleeve, and a tensioning assembly is provided between the sleeve and the two steel trusses. The support pile has beam grooves and slots on its four sides at the top. A stud is vertically rotatably mounted at the center of the top of the support pile, with a sleeve plate threaded onto its upper part. A support assembly is mounted on the upper part of the support pile, and outer and inner pressure seats are provided on the four sides of the sleeve plate. The plug-in blocks at the ends of the two steel trusses are respectively inserted into the corresponding beam grooves and slots, with the outer and inner pressure seats pressing against the upper walls of the steel trusses and the upper walls of the plug-in blocks, respectively. This application simplifies the connection between the steel trusses, support piles, and steel trusses by using plug-in assembly and bolt connections, improving the support effect and reducing the difficulties and high risks associated with welding operations.

Description

Technical Field

[0001] This application belongs to the field of large-span steel structure construction technology, and in particular relates to a prefabricated plug-in lightweight joint for large-span steel structures and its usage method. Background Technology

[0002] In recent years, with the vigorous promotion of industrialized construction and green construction, prefabricated steel structures have been widely promoted and applied in the fields of long-span steel truss bridges, exhibition halls, large factories, and space truss buildings due to their advantages such as small weight, high degree of industrialization, and fast construction speed.

[0003] However, traditional steel truss and space steel truss nodes generally employ three connection methods: gusset plates combined with on-site welding, high-strength bolt piercing and fastening, and cast steel integral nodes. While these technologies are mature, with the continuous increase in structural span and the increasing complexity of dynamic loads (vehicle, wind vibration, earthquake), the shortcomings of traditional node structures, such as excessive self-weight, low assembly efficiency, and high subsequent anti-corrosion and maintenance costs, are becoming increasingly prominent. They are ill-suited to the development needs of lightweight and rapid construction in large-span prefabricated steel structures. Furthermore, due to the large volume of on-site welding work at height, and the significant constraints imposed by wind, rain, temperature, and humidity, the quality of overhead and vertical welds is uncontrollable, easily leading to hidden defects such as slag inclusions, porosity, and microcracks. Under later dynamic fatigue conditions, these cracks will continue to propagate, shortening the structure's service life. In addition, the high temperature of welding generates residual stress and a heat-affected zone, causing localized embrittlement of the steel at the node and significant stress concentration. Under large-span heavy loads and alternating loads, these become weak points in the structure, failing to meet the design principle of strong nodes and weak components. Therefore, there is an urgent need to propose a lightweight, plug-in prefabricated steel structure node for large spans and its application method to solve this type of problem. Summary of the Invention

[0004] To address the problems existing in the background technology, this application provides a large-span steel structure prefabricated plug-in lightweight node and its usage method, which can simplify the connection between steel trusses and support piles, as well as the connection between steel trusses, by adopting plug-in assembly and bolt connection, thereby improving the support effect and reducing the problems of difficult and high-risk welding operations.

[0005] The technical solution to the technical problem addressed in this application is as follows:

[0006] According to one aspect of this application, a large-span steel structure prefabricated plug-in lightweight node is provided, comprising a support pile and a steel truss unit; the steel truss unit comprises two integrally rectangular steel trusses connected together, one end of each steel truss is provided with a plug-in block, and the other ends of the two steel trusses are connected by a sleeve, with a tensioning assembly between the sleeve and the two steel trusses; the top of the support pile has four sides with grooves and slots adapted to the outer wall of the steel truss body and the plug-in block, respectively, from the outside to the inside; a stud is vertically rotatably provided at the center of the top of the support pile, and the upper part of the stud is threaded with a... The sleeve plate has a support assembly on the upper part of the support pile. The four sides of the sleeve plate are respectively provided with outer pressure seats and inner pressure seats that can slide in the beam groove and slot. The two ends of the steel truss beams of the steel truss beam unit and the plug-in blocks provided thereon are respectively inserted and overlapped in the beam groove and slot on the corresponding side of the two support piles. By rotating the stud, the sleeve plate moves downward, which drives the outer pressure seats and inner pressure seats to press down on the upper wall of the steel truss beam and the upper wall of the plug-in block, respectively. At the same time, the lower end of the steel truss beam is supported by the support assembly, and the traction assembly pulls the adjacent steel truss beams close to each other and provides preload.

[0007] Furthermore, one end of the steel truss beam with the plug-in block is solid, while the remaining part is hollow.

[0008] Furthermore, the upper wall of the plug block is provided with a groove, and the lower end face of the inner pressure seat is provided with a socket that is inserted into the groove.

[0009] Furthermore, the lower end of the sleeve plate is provided with multiple limiting slide rods, and the upper end of the support pile is provided with multiple limiting slide grooves that correspond to and are adapted to the limiting slide rods. Each of the limiting slide rods is slidably disposed in its corresponding limiting slide groove.

[0010] Furthermore, the support pile has sliding grooves extending through its four sides; the support assembly includes a second stud coaxially connected to the lower end of the first stud, the threads of the first stud and the second stud having opposite directions, and the lower end of the second stud being rotatably connected to the support pile below the sliding groove; the second stud is threaded with a cross-shaped sliding seat, the four sides of which extend from the sliding groove to the outside of the support pile and can slide within the sliding groove, and the extended ends of the four sides of the sliding seat are respectively rotatably mounted with abutting plates via spiral hinges; a baffle is provided at the bottom of the end of the steel truss near the support pile, and the upper end of the abutting plate slides against the lower end of the steel truss and abuts against the side of the baffle away from the support pile.

[0011] Furthermore, the sliding block is connected to a limiting inclined seat at the extended ends on all four sides of the support pile. The limiting inclined seat is located on the side of the contact plate away from the support pile and tilts and limits the contact plate.

[0012] Furthermore, the traction assembly includes a fixed sleeve, a threaded collar seat, a threaded collar, a sliding sleeve, a collar seat, and a steel strand; the sliding sleeve is connected to adjacent steel truss beams on both sides of the steel sleeve by fixing bolts; the fixed sleeve is fixed to the side of the steel truss beam near the supporting pile; each fixed sleeve and steel sleeve is respectively provided with a threaded collar seat and a collar seat, and a threaded collar is rotatably provided on the threaded collar seat; one end of the steel strand passes through the collar seat and is connected to a limit plate, and the other end is connected to a stud head, which is threaded inside the threaded collar.

[0013] According to another aspect of this application, a method for using a large-span steel structure prefabricated plug-in lightweight node as described in the above technical solution is provided, the steps of which are as follows:

[0014] S1. The support piles are arranged in parallel intervals, and the stud is rotated so that the outer pressure seat and inner pressure seat on the four sides of the sleeve are respectively above the beam groove and the slot.

[0015] S2. Install sliding sleeves at the opposite ends of the two steel trusses and connect them with steel sleeves. Install steel hinges between the collar seats on both sides of the steel sleeve and the corresponding threaded collar seats. Perform preliminary pre-tightening through the limiting plate, threaded collar and stud head to form a steel truss unit.

[0016] S3. Insert and overlap the two ends of the steel truss beam unit and the plug-in block into the corresponding beam groove and slot at the top of the two support piles respectively;

[0017] S4. Rotate stud one, so that the outer pressure seat and inner pressure seat on the four sides of the sleeve plate move down along the beam groove and slot respectively and press against the two ends of the steel truss beam unit and the upper side of the plug block, so that the socket is inserted into the inner side of the slot; at the same time, the slide moves up under the action of stud two until it stops after contacting the rotating plate and the baffle.

[0018] S5. Pre-tighten the steel cable again using the stud head;

[0019] S6. Construct or connect nodes in other locations of this node in the same manner as described above.

[0020] Compared with existing technologies, the prefabricated plug-in lightweight joint for large-span steel structures and its usage method described in this application have the following specific advantages:

[0021] (1) The lightweight node structure of this application is novel, simple and practical. The beam groove and slot opened on the four sides of the upper end of the support pile facilitates the quick insertion and overlapping of the two ends of the steel truss beam unit and the plug-in block. The outer pressure seat and inner pressure seat on the sleeve plate are set by the stud and the sleeve plate, which facilitates the pressing of the steel truss beam and the plug-in block. At the same time, the socket at the bottom of the inner pressure seat is inserted into the groove at the top of the plug-in block, which improves the positioning accuracy between the steel truss beam and the support pile. After the steel truss beam unit is hoisted into place, the sleeve plate is moved down by rotating the stud, which can cause the outer pressure seat to abut against the upper side of both ends of the steel truss beam, and the inner pressure seat to abut against the upper side of the plug-in block at the end of the steel truss beam near the support pile. This can generate a pressure from top to bottom on the connection end of the steel truss beam and the support pile, avoiding the steel truss beam from simply pressing on the support pile by overlapping, which can easily cause the support pile to tilt, and thus cause the whole structure to collapse and affect the overall stability of the structure.

[0022] (2) By setting up a support component, when the first stud is rotated, the outer pressure seat and the inner pressure seat on the sleeve plate can also drive the second stud to rotate, thereby driving the slide to move upward. This allows the upper end of the contact plate, which is connected to the outer extension end of each side of the support pile by a spiral hinge, to contact and rotate with the lower end of the steel truss beam until it contacts the baffle and is then limited. This provides support for the bottom of the steel truss beam near the support pile, reducing the direct stress on the steel truss beam, especially at the lap end with the support pile. At the same time, by setting up a traction component, the steel strand, the limiting plate, the threaded collar and the stud head are used for traction and pre-tightening, thereby achieving traction and pre-tightening of the adjacent steel truss beams at the ends that are close to each other. This makes the adjacent steel truss beams more stable when they are close to each other, and can partially offset the effect of gravity. It also allows the steel truss beam itself to have a longer length to increase the structural span. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this application;

[0024] Figure 2 This is a cross-sectional view of the structure of this application;

[0025] Figure 3 This is a schematic diagram of the internal structure of the supporting piles and the upper structure of the steel truss beam in this application;

[0026] Figure 4 This is a schematic diagram of the structure on the steel truss beam of this application;

[0027] Figure 5 This is a schematic diagram of the structure at both ends of the steel sleeve in this application;

[0028] Figure 6 This is a schematic diagram of the supporting components of this application.

[0029] In the diagram: 1. Support pile; 2. Steel truss beam; 3. Insert block; 4. Beam groove; 5. Slot; 6. Groove body; 7. Stud one; 8. Sleeve plate; 9. Limiting slide rod; 10. Limiting slide groove; 11. External pressure seat; 12. Internal pressure seat; 13. Socket; 14. Stud two; 15. Slide groove; 16. Slide seat; 17. Abutment rotating plate; 18. Baffle; 19. Fixed sleeve; 21. Threaded collar seat; 22. Threaded collar; 23. Sliding sleeve; 24. Fixing bolt; 25. Steel sleeve; 26. Collar seat; 27. Limiting disc; 28. Steel strand; 29. ​​Stud head. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this disclosure pertains. The terms "upper," "lower," "left," "right," "front," and "back" used in the specification and claims of this patent application are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly. Words such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Any aspects not detailed in this application are well-known to those skilled in the art.

[0031] Example 1:

[0032] like Figures 1-6As shown, this application provides a large-span steel structure prefabricated plug-in lightweight node, which includes a support pile 1 and a steel truss unit; the steel truss unit includes two steel trusses 2 that are integrally rectangular and connected, one end of the steel truss 2 is provided with a plug-in block 3, and the other ends of the two steel trusses 2 are connected by a sleeve 25, and a tensioning component is provided between the sleeve 25 and the two steel trusses 2; the top of the support pile 1 has four sides with beam grooves 4 and slots 5 from the outside to the inside, which are adapted to the outer wall of the main body of the steel truss 2 and the plug-in block 3; a stud 7 is vertically rotatably installed at the center of the top of the support pile 1, and a sleeve plate 8 is threaded on the upper part of the stud 7. The upper part of the support pile 1 is provided with a support component. The four sides of the sleeve plate 8 are respectively provided with an outer pressure seat 11 and an inner pressure seat 12 that can slide in the beam groove 4 and the slot 5 from the outside to the inside. Among them, the ends of the two steel truss beams 2 of the steel truss beam unit and the plug-in blocks 3 provided on them are respectively inserted and overlapped in the beam groove 4 and the slot 5 on the corresponding side of the two support piles 1. By rotating the stud 7, the sleeve plate 8 moves downward, which drives the outer pressure seat 11 and the inner pressure seat 12 to press down on the upper wall of the steel truss beam 2 and the upper wall of the plug-in block 3 respectively. At the same time, the lower end of the steel truss beam 2 is supported by the support component, and the adjacent steel truss beams 2 are pulled together by the traction component and provided with pre-tension force.

[0033] In this embodiment, one end of the steel truss beam 2 with the plug block 3 is solid, and the remaining part is hollow, which effectively reduces the self-weight of the steel truss beam 3.

[0034] In this embodiment, the upper wall of the plug block 3 is provided with a groove 6, and the lower end face of the inner pressure seat 12 is provided with a socket 13 that cooperates with the groove 6. When the sleeve plate 8 moves down, it can be inserted into the inside of the groove 6 through the socket 13 to improve the assembly accuracy.

[0035] In this embodiment, the lower end of the sleeve plate 8 is provided with multiple limiting slide rods 9, and the upper end of the support pile 1 is provided with multiple limiting slide grooves 10 that correspond to and are adapted to the limiting slide rods 9. Each limiting slide rod 9 is slidably disposed in its corresponding limiting slide groove 10.

[0036] In this embodiment, the support pile 1 has sliding grooves 15 extending through its four sides; the support assembly includes a second stud 14 coaxially connected to the lower end of a first stud 7, the threads of the first stud 7 and the second stud 14 are opposite, and the lower end of the second stud 14 is rotatably connected to the support pile 1 below the sliding groove 15; a cross-shaped sliding seat 16 is threaded on the second stud 14, the four sides of the sliding seat 16 extend from the sliding groove 15 to the outside of the support pile 1, and can slide within the sliding groove 15, the extended ends of the four sides of the sliding seat 16 are respectively rotatably installed with abutment plates 17 through spiral hinges; a baffle 18 is provided at the bottom of the end of the steel truss beam 2 near the support pile 1, the upper end of the abutment plate 17 slides and fits against the lower end of the steel truss beam 2, and abuts against the side of the baffle 18 away from the support pile 1. When stud 7 rotates, it synchronously drives stud 14 to rotate, which in turn causes slide 16 to move upward. The contact plate 17, which is rotatably installed on the four sides of the slide 16, contacts and slides against the lower part of the steel truss beam 2 until it contacts the baffle 18 for limiting support.

[0037] In this embodiment, the sliding seat 16 is connected to the extension ends on all four sides of the support pile 1. The limiting inclined seat is located on the side of the contact plate 17 away from the support pile 1, and it tilts and limits the contact plate 17.

[0038] In this embodiment, the traction assembly includes a fixed sleeve 19, a threaded collar seat 21, a threaded collar 22, a sliding sleeve 23, a collar seat 26, and a steel strand 28. The sliding sleeve 23 is connected to the adjacent steel truss beams 2 on both sides of the steel sleeve 25 by fixing bolts 24. The fixed sleeve 19 is fixed to the side of the steel truss beam 2 near the support pile 1. Each fixed sleeve 19 and steel sleeve 25 is respectively provided with a threaded collar seat 21 and a collar seat 26, and a threaded collar 22 is rotatably provided on the threaded collar seat 21. One end of the steel strand 28 passes through the collar seat 26 and is connected to a limit plate 27, and the other end is connected to a stud head 29, which is threaded inside the threaded collar 22. With the above structure, the threaded collar 22 can be used to pull and pre-tighten the stud head 29 end of the steel strand 28, thereby achieving the pulling and pre-tightening of the adjacent steel truss beams 2 at their close ends. This makes the adjacent steel truss beams 2 more stable when close to each other, and can partially offset the effect of gravity, allowing the steel truss beams 2 to have a longer length to increase the structural span.

[0039] Example 2:

[0040] The following are the steps of using a large-span steel structure prefabricated plug-in lightweight node in Example 1:

[0041] S1. Parallel and spaced support piles 1 are set, and the stud 7 is rotated so that the outer pressure seat 11 and inner pressure seat 12 on the four sides of the sleeve plate 8 are respectively above the beam groove 4 and the slot 5.

[0042] S2. Install sliding sleeves 23 at the opposite ends of the two steel truss beams 2 and connect them with steel sleeves 25. Install steel hinge cables 28 between the collar seats 26 on both sides of the steel sleeves 25 and the corresponding threaded collar seats 21. Preliminary pre-tightening is performed through the limiting plate 27, threaded collar 22 and stud head 29 to form a steel truss beam unit.

[0043] S3. Insert both ends of the steel truss beam unit and the plug block 3 into the beam groove 4 and slot 5 corresponding to the top of the two support piles 1 respectively.

[0044] S4. Rotate stud 7 to make the outer pressure seat 11 and inner pressure seat 12 on the four sides of the sleeve plate 8 move down along the beam groove 4 and slot 5 respectively and press against the two ends of the steel truss beam unit and the upper side of the plug block 3, and make the socket 13 insert into the inside of the slot 6; at the same time, the slide 16 moves up under the action of stud 14 until it stops after contacting the rotating plate 17 and the baffle 18.

[0045] S5. Pre-tighten the steel cable 28 again through the stud head 29;

[0046] S6. Construct or connect nodes in other locations of this node in the same manner as described above.

Claims

1. A lightweight, plug-in prefabricated steel structure joint for large spans, characterized in that, The system includes a support pile (1) and a steel truss unit; the steel truss unit includes two steel trusses (2) that are rectangular in shape and connected together. One end of each steel truss (2) is provided with a plug-in block (3), and the other ends of the two steel trusses (2) are connected by a sleeve (25). A tensioning assembly is provided between the sleeve (25) and the two steel trusses (2). The top four sides of the support pile (1) are respectively provided with beam grooves (4) and slots (5) that are adapted to the outer wall of the main body of the steel truss (2) and the plug-in block (3). A stud (7) is vertically rotatably installed at the center of the top of the support pile (1). A sleeve plate (8) is threaded on the upper part of the stud (7). A support assembly is provided on the upper part of the support pile (1). The sleeve plate (8) is provided with an outer pressure seat (11) and an inner pressure seat (12) on its four sides from the outside to the inside, which can slide in the beam groove (4) and slot (5); wherein: the ends of the two steel truss beams (2) of the steel truss beam unit and the plug-in blocks (3) provided thereon are respectively inserted and overlapped in the beam groove (4) and slot (5) on the corresponding side of the two support piles (1), and the sleeve plate (8) is moved downward by rotating the stud (7), which drives the outer pressure seat (11) and the inner pressure seat (12) to press down on the upper wall of the steel truss beam (2) and the upper wall of the plug-in block (3) respectively, and at the same time, the lower end of the steel truss beam (2) is supported by the support assembly, and the adjacent steel truss beams (2) are pulled together by the traction assembly and provided with pre-tension force.

2. The large-span steel structure prefabricated plug-in lightweight node according to claim 1, characterized in that, The steel truss beam (2) has a solid end with a plug-in block (3) at one end, and the remaining part is hollow.

3. The large-span steel structure prefabricated plug-in lightweight node according to claim 1, characterized in that, The upper wall of the plug block (3) is provided with a groove (6), and the lower end face of the inner pressure seat (12) is provided with a socket (13) that is fitted into the groove (6).

4. The large-span steel structure prefabricated plug-in lightweight node according to claim 1, characterized in that, The lower end of the sleeve plate (8) is provided with multiple limiting slide rods (9), and the upper end of the support pile (1) is provided with multiple limiting slide grooves (10) that correspond to and are adapted to the limiting slide rods (9). Each limiting slide rod (9) is slidably disposed in its corresponding limiting slide groove (10).

5. The large-span steel structure prefabricated plug-in lightweight node according to claim 1, characterized in that, The support pile (1) has sliding grooves (15) extending through its four sides; the support assembly includes a stud two (14) coaxially connected to the lower end of stud one (7), the threads of stud one (7) and stud two (14) are opposite, and the lower end of stud two (14) is rotatably connected to the support pile (1) below the sliding groove (15); a cross-shaped slide seat (16) is threaded onto stud two (14), and the slide seat (16) The slide block (16) extends from the slide groove (15) to the outside of the support pile (1) on all four sides and can slide in the slide groove (15). The extended ends of the slide block (16) on all four sides are respectively equipped with abutting plates (17) by volute hinges. The bottom of the steel truss beam (2) near the support pile (1) is provided with a baffle (18). The upper end of the abutting plate (17) slides and fits against the lower end of the steel truss beam (2) and abuts against the side of the baffle (18) away from the support pile (1).

6. A large-span steel structure prefabricated plug-in lightweight node according to claim 5, characterized in that, The sliding seat (16) is connected to the extension end of the support pile (1) on all four sides. The limiting inclined seat is located on the side of the contact plate (17) away from the support pile (1) and limits the contact plate (17) to tilt.

7. The large-span steel structure prefabricated plug-in lightweight node according to claim 1, characterized in that, The traction assembly includes a fixed sleeve (19), a threaded collar seat (21), a threaded collar (22), a sliding sleeve (23), a collar seat (26), and a steel strand (28). The sliding sleeve (23) is connected to the adjacent steel truss beams (2) on both sides of the steel sleeve (25) by fixing bolts (24). The fixed sleeve (19) is fixed on the side of the steel truss beam (2) near the support pile (1). Each fixed sleeve (19) and steel sleeve (25) is respectively provided with the threaded collar seat (21) and the collar seat (26), and the threaded collar (22) is rotatably provided on the threaded collar seat (21). One end of the steel strand (28) passes through the collar seat (26) and is connected to a limit plate (27), and the other end is connected to a stud head (29), which is threaded inside the threaded collar (22).

8. The method of using a large-span steel structure prefabricated plug-in lightweight joint according to any one of claims 1-7, characterized in that, The steps are as follows: S1. The support piles (1) are arranged in parallel intervals. The stud (7) is rotated so that the outer pressure seat (11) and inner pressure seat (12) on the four sides of the sleeve plate (8) are respectively above the beam groove (4) and the slot (5); S2. Install sliding sleeves (23) at the opposite ends of the two steel truss beams (2) and connect them through steel sleeves (25). Install steel hinges (28) between the collar seats (26) on both sides of the steel sleeve (25) and the corresponding threaded collar seats (21). Preliminary pre-tightening is performed through the limiting plate (27), threaded collar (22) and stud head (29) to form a steel truss beam unit. S3. Insert the two ends of the steel truss beam unit and the plug block (3) into the beam groove (4) and slot (5) corresponding to the top of the two support piles (1), respectively. S4. Rotate stud one (7) so that the outer pressure seat (11) and inner pressure seat (12) on the four sides of the sleeve plate (8) move down along the beam groove (4) and slot (5) respectively and press down on both ends of the steel truss beam unit and the upper side of the plug block (3), and so that the socket (13) is inserted into the inside of the slot (6); at the same time, the slide (16) moves up under the action of stud two (14) until it stops after contacting the rotating plate (17) and the baffle (18); S5. Tighten the steel cable (28) again through the stud head (29); S6. Construct or connect nodes in other locations of this node in the same manner as described above.

Images