Large-span steel structure roof structure

Abstract

The invention relates to the technical field of roof structures, in particular to a large-span steel structure roof structure. Comprising a pipe truss formed by connecting a plurality of truss units, each truss unit is composed of three chord members, and a plurality of web members are evenly connected among the three chord members; a connecting mechanism is arranged between every two adjacent truss units. The connecting mechanism with the internal expansion type sealing function is arranged and matched with the technology of pouring epoxy resin through pressure, and a novel joint structure with the synergistic effect of mechanical expansion sealing and resin composite force transfer is formed at the connecting position of the adjacent truss units. According to the structure, in the construction stage, the assembly clearance is automatically eliminated through radial expansion of the expansion sleeve, accurate centering is achieved, and in the use stage, uniform transmission of loads is achieved through tight combination of epoxy resin and the metal pipe wall, so that the problems of stress concentration and fretting wear caused by clearance fit of traditional pipe truss nodes are solved; and the overall rigidity, the fatigue life and the long-term service performance of the joint are remarkably improved.

Description

A large-span steel roof structure Technical Field

[0001] This invention relates to the field of roof structure technology, and in particular to a large-span steel roof structure. Background Technology

[0002] Large-span steel structure roofs refer to structural systems with a span of no less than 60 meters. They are commonly found in public buildings such as stadiums, exhibition centers, and transportation hubs that require expansive, column-free spaces. Currently widely used structural types include space frame structures, tubular truss structures, cable-stayed structures, and membrane structures. Among these, tubular truss structures consist of three parts: chords, web members, and nodes. In terms of installation and construction, due to limitations in transportation dimensions and factory manufacturing conditions, tubular trusses are typically divided into several segments. These segments are prefabricated in the factory and transported to the site, where they are assembled using connecting rods and then connected into a whole through welding or other methods. For scenarios with strict requirements on clear height, such as factory production lines, warehouse shelves, and stadium stands, straight trusses are typically used to avoid the problem of wasted space in the middle of arched structures. Compared to curved structures, this significantly reduces processing costs and construction time.

[0003] However, the following problems exist in the current use of various units in tubular trusses: To ensure that the connecting rod can be smoothly inserted into the chord for rapid installation, a clearance fit must be used between the connecting rod and the inner wall of the chord. This design has two key technical defects: First, under alternating wind loads, the connecting rod and the inner wall of the chord will experience continuous fretting vibrations due to the assembly gap. This high-frequency micro-impact and wear directly acts on the root of the weld, causing stress concentration and fatigue crack initiation in the weld area, severely weakening the fatigue resistance of the node. Second, and more importantly, the clearance fit means that the load cannot be effectively transferred through the connecting rod in the initial stage of stress. Almost all external forces are borne by the weld alone, forming a dangerous "weld-only load-bearing" state. Only when the weld cracks due to overload or the structure undergoes significant deformation can the connecting rod be attached to the inner wall of the chord and begin to share the load. This non-cooperative force mechanism greatly reduces the initial stiffness and ultimate bearing capacity of the node.

[0004] Therefore, the fretting vibration damage and non-cooperative stress caused by the clearance fit between the connecting rod and the chord seriously affect the structural safety and durability, and are technical problems that need to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the above problems, the present invention provides a large-span steel structure roof structure to solve the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a large-span steel structure roof structure, comprising a tubular truss composed of multiple sets of truss units, each set of truss units consisting of three chord members, with multiple web members evenly connected between the three chord members; a connecting mechanism is provided between adjacent sets of truss units.

[0007] The connecting mechanism includes a sleeve, with a sleeve provided between two adjacent left and right chords. A partition is provided in the middle of the sleeve, and T-shaped columns are fixedly installed at both ends of the partition. A sliding sleeve is slidably fitted on the horizontal section of the T-shaped column, and an expansion sleeve is fixedly installed between the T-shaped column and the sliding sleeve. The expansion sleeve is slidably fitted on the horizontal section of the T-shaped column.

[0008] A reinforcing part is provided between the three sleeves to connect them into a whole. A pushing part is provided on the partition plate to push the sliding sleeve to move. A pulling part is provided between the reinforcing part and the frame unit.

[0009] The casing has grouting holes and venting holes, and the partition plate has through holes evenly distributed.

[0010] The chord is inserted into the sleeve and the sliding sleeve is driven to move axially through the pushing part, which forces the expansion sleeve to expand radially and form an interference fit with the inner wall of the chord. The sleeve and the chord are automatically aligned and positioned and the ends are sealed. Then, epoxy resin is injected through the grouting hole to fill the cavity formed by the seal. After curing, it forms an integral composite force transmission structure together with the welded sleeve.

[0011] As a preferred embodiment, the pulling part includes a support block fixedly installed at the center of the fixed component, a pull rod fixedly installed between the two support blocks, the two ends of the pull rod fixedly passing through the corresponding support blocks, a fixing plate provided on the opposite surface of the two support blocks, the fixing plate being fixedly connected to the corresponding frame unit, and nuts being threadedly connected to the two ends of the pull rod after sliding through the corresponding fixing plate.

[0012] As a preferred embodiment, the reinforcement includes two sets of fixing components fixedly installed between the three sleeves. Each set of fixing components consists of three connecting posts. The three connecting posts in the same set form a triangular structure, and the three sleeves are located at the three vertices of the triangle formed by the connecting posts.

[0013] As a preferred embodiment, the pushing part includes push rods. Multiple push rods are fixedly installed on the end of the sliding sleeve near the corresponding partition. The end of the push rod on the same sliding sleeve that is away from the corresponding sliding sleeve slides through the partition and is fixedly installed with a pressure ring.

[0014] As a preferred embodiment, the end of the T-shaped column is provided with a guide slope.

[0015] As a preferred embodiment, there are gaps between the inner wall of the sleeve and the outer wall of the chord, as well as between the inner wall of the chord and the sliding sleeve and the T-shaped column.

[0016] As a preferred embodiment, the grouting hole is located at the lowest point of the casing, and the venting hole is located at the highest point of the casing.

[0017] As a preferred option, the push rods on the two pressure rings within the same casing are staggered.

[0018] As a preferred embodiment, both the connecting column and the support block are hollow structures.

[0019] As a preferred embodiment, both the grouting hole and the vent hole are fitted with plugs.

[0020] The above-mentioned one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: First, the present invention, by setting a connection mechanism with an internal expansion sealing function and cooperating with the process of pressure injection of epoxy resin, forms a novel node structure at the connection of adjacent unit sections, which is a combination of mechanical expansion sealing and resin composite force transmission. During the construction stage, the radial expansion of the expansion sleeve automatically eliminates the assembly gap and achieves precise alignment. During the use stage, the tight bond between the epoxy resin and the metal pipe wall achieves uniform load transfer, thereby solving the problem of stress concentration and fretting wear caused by the gap fit of traditional pipe truss nodes, and significantly improving the overall stiffness, fatigue life and long-term service performance of the node.

[0021] Second, the present invention utilizes a structural design that drives the sliding sleeve through a pushing part to generate controllable radial expansion of the expansion sleeve. This design achieves three beneficial effects simultaneously during component installation: First, the uniform expansion force in the circumferential direction automatically corrects the positional deviation of the T-shaped column and the sleeve on the chord, ensuring alignment accuracy; second, the expanded expansion sleeve forms a tight interference fit with the inner wall of the chord, establishing a reliable end seal; and third, it forms a complete sealed chamber for subsequent epoxy resin pressure injection. These three interconnected effects guarantee the construction quality and reliability of the node connection from the source of the process.

[0022] Third, the composite force transmission system constructed by the welded and fixed sleeve and the cured epoxy resin grouting layer of this invention forms a complementary load-bearing mechanism during the service stage: the welded joint of the steel structure provides the main tensile and shear strength, while the epoxy resin layer that fills all the micro gaps effectively disperses local stress, avoiding the problem of stress concentration in the weld area in traditional connections. At the same time, the resin layer completely eliminates the micro-movement space between components. This multi-protection mechanism that combines rigidity and flexibility significantly improves the fatigue resistance and long-term load-bearing stability of the joint under dynamic loads.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 is a three-dimensional structural diagram of the present invention.

[0026] Figure 2 is a partial structural schematic diagram of the connecting mechanism of the present invention.

[0027] Figure 3 is an exploded view of a portion of the connecting mechanism of the present invention.

[0028] Figure 4 is a cross-sectional view of the tensioning part of the present invention.

[0029] Figure 5 is an enlarged view of the structure at point A in Figure 4.

[0030] Figure 6 is a cross-sectional view of the expansion sleeve located inside the chord but not compressed and undergoing radial expansion.

[0031] Reference numerals: 1. Piece unit; 10. Chord; 11. Web member; 2. Connecting mechanism; 20. Sleeve; 200. Grouting hole; 201. Vent hole; 202. Plug; 21. Partition plate; 210. Through hole; 22. T-shaped column; 23. Sliding sleeve; 24. Expansion sleeve; 3. Pulling part; 30. Support block; 31. Tie rod; 32. Fixing plate; 33. Nut; 4. Pushing part; 40. Push rod; 41. Pressure ring; 5. Connecting column; 6. Weld; 7. Epoxy resin. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] As shown in Figure 1, a large-span steel roof structure includes a tubular truss composed of multiple sets of frame units 1 connected together. Each frame unit 1 consists of three triangularly distributed chord members 10, and multiple web members 11 are evenly connected between the three chord members 10. A connecting mechanism 2 is provided between two adjacent sets of frame units 1.

[0034] As shown in Figures 1, 2, 3 and 4, the connecting mechanism 2 includes a sleeve 20. A sleeve 20 is provided between two adjacent left and right chords 10. A partition 21 is provided in the middle of the sleeve 20. T-shaped columns 22 are coaxially fixedly installed at both ends of the partition 21. A sliding sleeve 23 is slidably fitted on the horizontal section of the T-shaped column 22. An expansion sleeve 24 is fixedly installed between the T-shaped column 22 and the sliding sleeve 23. The expansion sleeve 24 is slidably fitted on the horizontal section of the T-shaped column 22. A grouting hole 200 and an air vent 201 are provided on the sleeve 20. Through holes 210 are evenly provided on the partition 21.

[0035] As shown in Figures 1, 2 and 3, a reinforcing part is provided between the three sleeves 20 to connect the three sleeves 20 into a whole. A pushing part 4 is provided on the partition 21 to push the sliding sleeve 23 to move. A pulling part 3 is provided between the reinforcing part and the frame unit 1.

[0036] As shown in Figures 1, 2 and 3, the reinforcement includes two sets of fixing components fixedly installed between the three sleeves 20. Each set of fixing components consists of three connecting posts 5. The three connecting posts 5 in the same set form a triangular structure, and the three sleeves 20 are respectively located at the three vertices of the triangle formed by the connecting posts 5.

[0037] As shown in Figures 1 to 6, during operation, the T-shaped column 22, the expansion sleeve 24, and the sliding sleeve 23 are first smoothly inserted into the port of the chord 10, and the sleeve 20 is fitted onto the outside of the corresponding two chord 10 ports. Then, the two frame units 1 move closer to each other to drive the pushing part 4, which in turn pushes the sliding sleeve 23 to move. Through the axial movement of the sliding sleeve 23, the expansion sleeve 24 is axially compressed in the cavity. This compression force forces the expansion sleeve 24 to produce controllable radial expansion and form an interference fit with the inner wall of the chord 10. This expansion process produces two key effects: first, the fit between the expansion sleeve 24 and the inner wall of the chord 10 enables the automatic centering and positioning of the sleeve 20; second, it seals the inner cavity of the chord 10 into a sealed cavity. Then, a weld 6 is welded around the two ports of the sleeve 20 to the corresponding chord 10 to seal them, so as to weld the sleeve 20 and the corresponding two chord 10 into a whole.

[0038] Epoxy resin 7 is then injected into the grouting hole 200. Under constant pressure, the epoxy resin 7 flows evenly within the chord 10 and the sleeve 20 until it completely fills all gaps and overflows from the vent hole 201. Finally, the seal is maintained until the resin is completely cured, forming a seamless composite structure between the T-shaped column 22, the sleeve 20, and the chord 10. This installation method not only ensures precise alignment and complete sealing between components, but more importantly, through pressure injection, it completely eliminates the stress concentration and fretting wear hazards caused by traditional gap fits. The resulting composite force transmission system fundamentally improves the stiffness of the joint.

[0039] Furthermore, it should be noted that the expansion sleeve 24 is a temporary process function rather than a primary long-term load-bearing component. It only maintains its working state during the curing stage of epoxy resin 7. Once the epoxy resin 7 has cured and formed a solid composite force-transmitting structure, the long-term load-bearing function of the joint is entirely borne by the welded connection between the sleeve 20 and the chord 10, as well as the high-strength epoxy resin 7 grouting layer. At this point, the expansion sleeve 24 has completed its phased mission. This clearly defined functional design ensures both accurate positioning and reliable sealing during the construction phase, and also ensures the safety of the structure's long-term load-bearing capacity during the service phase.

[0040] As shown in Figures 1, 2, 3 and 4, the pulling part 3 includes a support block 30 fixedly installed at the center of the fixed component. A pull rod 31 is fixedly installed between the two support blocks 30. The two ends of the pull rod 31 are fixedly inserted through the corresponding support blocks 30. A fixing plate 32 is provided on the opposite surface of the two support blocks 30. The fixing plate 32 is fixedly connected to the corresponding frame unit 1. The two ends of the pull rod 31 slide through the corresponding fixing plate 32 and are threaded with nuts 33.

[0041] As shown in Figures 3, 4 and 5, the end of the T-shaped post 22 is provided with a guide slope, which constitutes the initial guide structure of the insertion end, making it convenient for the T-shaped post 22 to be inserted into the chord 10.

[0042] As shown in Figures 3, 4 and 5, the pushing part 4 includes push rods 40. Multiple push rods 40 are fixedly installed on one end of the sliding sleeve 23 near the corresponding partition 21. The push rods 40 on the same sliding sleeve 23 slide through the partition 21 at the end away from the corresponding sliding sleeve 23 and are then fixedly installed with a pressure ring 41.

[0043] As shown in Figure 3, the push rods 40 on the two pressure rings 41 inside the same sleeve 20 are staggered. This staggered arrangement ensures that the push rods 40 of the two pressure rings 41 can move independently without interfering with each other in a limited space.

[0044] As shown in Figures 3 and 4, both the connecting column 5 and the support block 30 are hollow structures. This hollow design ensures structural rigidity while achieving effective material saving and weight optimization, thus meeting the force transmission requirements and improving the economy of the entire connecting mechanism 2.

[0045] As shown in Figures 1 and 6, during actual operation, the two corresponding chord rods 10 move simultaneously and are inserted into the two ends of the sleeve 20 respectively. During the insertion process, the ends of the chord rods 10 push the pressure ring 41 on the same side to move. The pressure ring 41 then pushes the sliding sleeve 23 on the other side to move through the corresponding push rod 40. The movement of the sliding sleeve 23 pushes the expansion sleeve 24 to expand and fit tightly against the inner wall of the other chord rod 10. At this time, the pull rod 31 slides through the corresponding fixing plate 32. Then, the pull rod 31 is fixed to the corresponding fixing plate 32 by the nut 33, thereby further improving the stability of the sleeve 20. Then, the sleeve 20 and the chord rod 10 are welded together.

[0046] As shown in Figures 3, 4, 5 and 6, there are gaps between the inner wall of the sleeve 20 and the outer wall of the chord 10, as well as between the inner wall of the chord 10 and the sliding sleeve 23 and the T-shaped column 22.

[0047] As shown in Figures 2, 4 and 5, the grouting hole 200 is located at the lowest point of the sleeve 20, and the vent hole 201 is located at the highest point of the sleeve 20.

[0048] As shown in Figures 2, 4 and 5, both the grouting hole 200 and the vent hole 201 are equipped with plugs 202.

[0049] As shown in Figures 2 and 6, during the actual operation, in the process of injecting epoxy resin 7, the operator first connects the special grouting equipment through the pre-set grouting hole 200 at the bottom of the chord 10, while ensuring that the top vent hole 201 is open. Using a low-speed, low-pressure grouting process, the pre-mixed epoxy resin 7 slurry is steadily injected into the gap formed between the T-shaped column 22, the sliding sleeve 23, the expansion sleeve 24, and the inner wall of the chord 10. Under pressure, the epoxy resin 7 slowly rises from bottom to top. During this process, some air inside the cavity is gradually driven out as the epoxy resin 7 rises and is orderly discharged through the top vent hole 201. When a continuous flow of full and bubble-free epoxy resin 7 is observed flowing from the vent hole 201, it indicates that the cavity is completely filled and compacted. At this point, the equipment is immediately unloaded. In addition to the grouting equipment, the grouting hole 200 is quickly sealed with plug 202. Then, while keeping the system stationary, the discharge from the vent hole 201 is observed. Once a small amount of epoxy resin 7 overflows, the vent hole 201 is immediately sealed with plug 202, thus forming a completely sealed pressure cavity. During the curing stage of epoxy resin 7, a completely sealed state is maintained. In the initial stage, epoxy resin 7 remains in a fluid state, which can self-compensate for the voids caused by slight shrinkage. Subsequently, it enters the gel stage and gradually loses fluidity but still retains stress relaxation ability. Finally, it completes the solid transformation through cross-linking reaction, forming a defect-free dense composite that is tightly bonded to the surface of the steel structure. This process ensures that the interface between epoxy resin 7 and metal achieves optimal mechanical properties.

[0050] Furthermore, it is worth noting that the epoxy resin 7 grouting process adopted in this design embodies the engineering concept of exchanging limited process time for permanent structural reliability. Although this process requires reasonable process waiting time, this investment brings about a fundamental improvement in the quality of node connections: the composite force transmission system formed by epoxy resin 7 transforms the node from a gap fit with initial defects into a completely dense integral force-bearing system. This transformation enables the structure to achieve uniform force transmission when bearing loads, effectively avoiding the dangerous situation of weld 6 bearing alone in traditional connection methods, and fundamentally solving the problem of fatigue damage caused by vibration. This technical approach not only significantly improves the safety performance and service life of the node, but also demonstrates its technical necessity and engineering practical value by eliminating potential quality hazards.

[0051] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0052] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A large-span steel roof structure, comprising a tubular truss composed of multiple sets of interconnected frame units, each set of frame units consisting of three chord members, with multiple web members evenly connected between the three chord members; characterized in that: A connecting mechanism is provided between two adjacent sets of units; the connecting mechanism includes a sleeve, a sleeve is provided between two adjacent left and right chords, a partition is provided in the middle of the sleeve, and T-shaped columns are fixedly installed at both ends of the partition. A sliding sleeve is slidably fitted on the horizontal section of the T-shaped column, and an expansion sleeve is fixedly installed between the T-shaped column and the sliding sleeve, with the expansion sleeve slidably fitted on the horizontal section of the T-shaped column; a reinforcing part is provided between the three sleeves to connect the three sleeves into a whole, a pushing part is provided on the partition for pushing the sliding sleeve to move, and a pulling part is provided between the reinforcing part and the unit; grouting holes and venting holes are opened on the sleeve, and through holes are evenly opened on the partition; the chord is inserted into the sleeve and the sliding sleeve is driven to move axially through the pushing part, forcing the expansion sleeve to expand radially and form an interference fit with the inner wall of the chord, thus automatically centering and positioning the sleeve and the chord and sealing the end; then epoxy resin is injected under pressure through the grouting hole to fill the cavity formed by the seal, and after curing, it forms an integral composite force transmission structure together with the welded sleeve.

2. The large-span steel roof structure according to claim 1, characterized in that: The pulling part includes a support block fixedly installed at the center of the fixed component. A pull rod is fixedly installed between the two support blocks. The two ends of the pull rod are fixedly inserted through the corresponding support blocks. A fixing plate is provided on the opposite surface of the two support blocks. The fixing plate is fixedly connected to the corresponding frame unit. Nuts are threadedly connected to the two ends of the pull rod after sliding through the corresponding fixing plate.

3. The large-span steel roof structure according to claim 2, characterized in that: The reinforcement includes two sets of fixing components fixedly installed between the three sleeves. Each set of fixing components consists of three connecting posts. The three connecting posts in the same set form a triangular structure, and the three sleeves are located at the three vertices of the triangle formed by the connecting posts.

4. A large-span steel roof structure according to claim 1, characterized in that: The pushing part includes push rods. Multiple push rods are fixedly installed on the end of the sliding sleeve near the corresponding partition. The end of the push rod on the same sliding sleeve that is away from the corresponding sliding sleeve slides through the partition and is fixedly installed with a pressure ring.

5. A large-span steel roof structure according to claim 1, characterized in that: The end of the T-shaped column is provided with a guide slope.

6. A large-span steel roof structure according to claim 1, characterized in that: There are gaps between the inner wall of the sleeve and the outer wall of the chord, as well as between the inner wall of the chord and the sliding sleeve and the T-shaped column.

7. A large-span steel roof structure according to claim 1, characterized in that: The grouting hole is located at the lowest point of the casing, and the venting hole is located at the highest point of the casing.

8. A large-span steel roof structure according to claim 4, characterized in that: The push rods on the two pressure rings inside the same casing are staggered.

9. A large-span steel roof structure according to claim 3, characterized in that: Both the connecting column and the support block are hollow structures.

10. A large-span steel roof structure according to claim 1, characterized in that: Both the grouting hole and the vent hole are fitted with plugs.

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