A fixing structure of a large-span fabricated steel structure

Abstract

This invention provides a fixing structure for the supporting beam and main beam in a large-span prefabricated steel structure, effectively solving the problems of unreasonable force distribution at the intersection of steel structures, limited contact area between fasteners and steel structures, and inability to make on-site adaptive adjustments in the prior art. The technical solution includes two clamping modules, one upper and one lower. Each clamping module includes a mounting base, a mounting frame on each of the front and rear sides, and two rotating shafts inside the mounting frames, which can move up and down. There are gears on the upper side of the rotating shafts, and the gears are connected to the rotating shafts via a spline structure. There is a rack between the two gears on the same mounting frame, and there is a screw on the rack. There is a clamping plate on one side of the rotating shaft, and the edge of the clamping plate near the rotating shaft is folded into an L-shaped plate and fixed to the rotating shaft. A pressure-bearing unit is set between the two clamping modules, which includes an upper pad and a lower pad. The lower end surface of the upper pad is a convex spherical surface, and the upper end surface of the lower pad is a concave spherical surface.

Description

Technical Field

[0001] This invention relates to the field of large-span prefabricated steel structure building technology, and in particular to a fixing structure for the support beam and the main beam in a large-span prefabricated steel structure. Background Technology

[0002] In the construction of prefabricated steel structure buildings, corner braces, main beams, and their side braces are erected and fixed to supporting beams. The main beams and supporting beams intersect perpendicularly, while the corner braces and supporting beams intersect diagonally. In existing technology, the installation and fixing of supporting beams and corner braces is as follows: Figure 1 As shown, before fixing, triangular plates need to be welded to both sides of the corner brace to achieve positioning, and then the two are pressed together by tightening bolts. This technology also has obvious defects. Since the support beam and the triangular brace are connected by I-beams, the contact area is extremely limited. When the building is subjected to natural vibrations, the triangular plates are subjected to more lateral forces, and the triangular plates will deform slightly, causing loosening at the connection point. At the same time, once the triangular steel is welded, it means that it cannot be adjusted later. However, steel structures will expand and contract in alternating hot and cold environments, which will further aggravate the deformation of the triangular plates and even cause them to fall off. After thermal expansion and contraction, the force exerted by the upper beam on the lower support beam is inclined, which further aggravates the instability of the joint. In addition, because the upper beam is subjected to complex forces, the direction of the force exerted by the upper beam on the support beam is not perpendicular, which is prone to local deformation, further accelerating the loosening and shaking of the connection joint, and greatly weakening the seismic performance and stability of the overall building structure. The existing technology has no better method than to regularly inspect and tighten the connection nodes. However, simply tightening only further clamps the original position, which can only achieve stability for a period of time. This will increase the deformation of the I-beam, which is detrimental to the overall structural performance of the building.

[0003] To address the aforementioned issues, a fixing structure for the support beams and main beams in a large-span prefabricated steel structure is provided. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a fixing structure for the supporting beam and the main beam in a large-span prefabricated steel structure, which effectively solves the problems of unreasonable force distribution at the intersection of steel structures, limited contact area between fasteners and steel structures, and inability to make on-site adaptive adjustments in the prior art.

[0005] The technical solution includes two clamping modules, one above the other. Each clamping module has a mounting base and a mounting bracket on each of the front and rear sides. Inside each mounting bracket are two vertical, rotatable shafts that can move up and down. Gears are mounted on the upper side of the shafts, connected to them via a spline structure. The gears are rotatably mounted on the mounting brackets. A rack is positioned between the two gears on the same mounting bracket, and a screw is threaded onto the rack. Tightening the screw drives the two gears to rotate synchronously in opposite directions via the rack, which in turn drives the two shafts to rotate synchronously in opposite directions. A clamping plate is located on the side of the shaft furthest from the mounting bracket. The edge of the clamping plate near the shaft is folded into an L-shape and fixed to the shaft. The rack drives the shaft to rotate synchronously in opposite directions via the two gears on either side, thus ensuring the clamping plate is tightly fitted to the web of the I-beam. A pressure-bearing unit is provided between the two clamping modules. The pressure-bearing unit includes an upper pad and a lower pad. The upper pad is fixed on the mounting base of the upper clamping module, and the lower pad is fixed on the mounting base of the lower clamping module. The lower end surface of the upper pad is a convex spherical surface, and the upper end surface of the lower pad is a concave spherical surface.

[0006] Preferably, the spline structure includes a spline tube, which is fixed to the lower end of the gear. The upper end of the rotating shaft has a rectangular cross-section, which is splined with the spline of the spline tube. The upper end of the rotating shaft is inserted into the spline tube. A compression spring connects the rotating shaft and the spline tube.

[0007] Preferably, the lower edge of the clamping plate is inclined upward at the end away from the rotating shaft. When the rotating shaft drives the clamping plate to press against the web of the I-beam, the lower edge of the clamping plate applies pressure to the I-beam, causing the flange of the I-beam to be clamped between the clamping plate and the mounting base.

[0008] Preferably, the rotating shaft has a hexagonal cavity inside, and the base plate has a bolt and nut structure, wherein the nut is placed inside the cavity and does not detach from the rotating shaft, and the end of the bolt is placed on the side of the base plate away from the rotating shaft; turning the bolt can control the up and down movement of the rotating shaft.

[0009] Preferably, two fixing plates are fixed on the lower end face of the upper mounting base. The fixing plates are provided with arc-shaped grooves, and the ends of the bolts in the clamping structure on the lower side are placed on the upper side of the arc-shaped grooves. Tightening the bolts in the lower clamping module can make the upper and lower base plates form a whole.

[0010] Preferably, the mounting bracket is fixed with a threaded cylinder corresponding to the screw, the screw is placed inside the threaded cylinder, the rack is cylindrical, and the teeth on the rack are annular teeth.

[0011] Preferably, the angle between the clamping plate and the L-shaped plate formed by the folding of the rotating shaft is an obtuse angle.

[0012] Preferably, the clamping plate has folded edges on both the upper and lower sides, wherein the folded edge on the lower side of the clamping plate forms an obtuse angle with the clamping plate.

[0013] This invention features an ingenious structure. By improving the stress environment between the upper and lower beams and increasing the contact area between the fasteners and the I-beams, it employs an adjustable structure to achieve adaptive adjustment of the fixed nodes, ensuring that the intersecting nodes are stable and durable. It can adapt to nodes with different angles, is convenient and quick, has strong adaptability, does not require complex welding operations, and meets the needs of modern construction technology. Attached Figure Description

[0014] Figure 1 The existing technology provides a fixed structure between the figure-eight brace and the supporting beam.

[0015] Figure 2 This is a structural diagram of the present invention in use.

[0016] Figure 3 This is a schematic diagram of the overall invention.

[0017] Figure 4 This is a three-dimensional exploded view of the present invention.

[0018] Figure 5 This is a three-dimensional view of the clamping module in this invention.

[0019] Figure 6 This is a front view of the clamping module in this invention.

[0020] Figure 7 This is a side view of the clamping module in this invention.

[0021] Figure 8 This is a top view of the clamping module in this invention.

[0022] Figure 9 This is a structural diagram of the rotating shaft and its gears, clamps, etc. in this invention.

[0023] Figure 10 This is a schematic diagram of the installation of the mounting base on the upper side and the arc-shaped plate at its lower end in this invention.

[0024] Figure 11 This is a schematic diagram of the installation of the pressure-bearing unit in this invention. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] Depend on Figures 1 to 11The present invention comprises two clamping modules, one upper and one lower. Each clamping module includes a mounting base 1 and a mounting bracket 2 on each of the front and rear sides. Inside each mounting bracket 2 are two vertically rotatable shafts 3, which can move up and down. A gear 4 is mounted on the upper side of each shaft 3, connected to the shaft 3 via a spline structure. The gear 4 is rotatably mounted on the mounting bracket 2. A rack 5 is positioned between the two gears 4 on the same mounting bracket 2, and a screw 6 is screwed onto the mounting bracket 2. Tightening the screw 6 drives the two gears 4 to rotate synchronously in opposite directions via the rack 5, thereby driving the two shafts 3 to rotate synchronously in opposite directions. A clamping plate 7 is located on the side of the shaft 3 away from the mounting bracket 2. The clamping plate 7 is folded into an L-shape near the edge of the shaft 3 and fixed to it. The rack 5 drives the shaft 3 to rotate synchronously in opposite directions via the two gears 4 on either side, thus achieving tight contact between the clamping plate 7 and the web of the I-beam 8. A pressure-bearing unit is provided between the two clamping modules. The pressure-bearing unit includes an upper pad 9 and a lower pad 10. The upper pad 9 is fixed on the mounting base 1 of the upper clamping module, and the lower pad 10 is fixed on the mounting base 1 of the lower clamping module. The lower end surface of the upper pad 9 is a convex spherical surface, and the upper end surface of the lower pad 10 is a concave spherical surface.

[0027] In order for gear 4 to drive shaft 3 to rotate without affecting the up-and-down movement of shaft 3, the spline structure includes a spline cylinder 11, which is fixed to the lower end of gear 4. The upper end of shaft 3 has a rectangular cross-section, which is splined with the spline of spline cylinder 11. The upper end of shaft 3 is inserted into spline cylinder 11. A compression spring is connected between shaft 3 and spline cylinder 11.

[0028] In order to firmly press the I-beam 8 onto the mounting base 1, the lower edge of the clamping plate 7 is inclined upward away from the rotating shaft 3. When the rotating shaft 3 drives the clamping plate 7 to press against the web of the I-beam 8, the lower edge of the clamping plate 7 applies pressure to the I-beam 8, so that the flange of the I-beam 8 is clamped between the clamping plate 7 and the mounting base 1.

[0029] In order for the clamping plate 7 to further clamp the flange of the I-beam 8 after clamping the web of the I-beam 8, a hexagonal cavity 12 is provided inside the rotating shaft 3, and a bolt 14 and nut 13 structure is provided on the bottom plate, wherein the nut 13 is placed inside the cavity 12 and does not detach from the rotating shaft 3, and the end of the bolt 14 is placed on the side of the bottom plate away from the rotating shaft 3; turning the bolt 14 can control the up and down movement of the rotating shaft 3.

[0030] To further enhance the integrity of the entire connection structure, limit the collision intensity between the two modules during a strong earthquake, and accommodate intersections at different angles, two fixing plates 15 are fixed on the lower end face of the upper mounting base 1. The fixing plates 15 have arc-shaped grooves 16, with the ends of the bolts 14 in the lower clamping structure positioned on the upper side of the arc-shaped grooves 16. Tightening the bolts 14 in the lower clamping module allows the upper and lower base plates to form a whole.

[0031] The mounting bracket 2 is fixed with a threaded cylinder 17 corresponding to the screw 6. The screw 6 is placed inside the threaded cylinder 17. The rack 5 is cylindrical and the teeth on the rack 5 are annular teeth.

[0032] In order for the clamping plate 7 to better hold the web of the steel beam, the angle between the clamping plate 7 and the L-shaped plate formed by the folding of the rotating shaft 3 is an obtuse angle.

[0033] In order to reduce the area between the two flanges of the I-beam 8 and increase the contact area between the clamping plate 7 and the flanges of the I-beam 8, the upper and lower sides of the clamping plate 7 are provided with folded edges 18, wherein the folded edge 18 on the lower side of the clamping plate 7 forms an obtuse angle with the clamping plate 7.

[0034] Since both the main beam and the V-bracing have their own weight, in environments with small temperature differences or no strong vibrations, it is not necessary to fix the upper and lower clamping modules into one piece, thus eliminating the need for the fixing plate 15. The upper and lower clamping modules only need to clamp the main beam, support beam, or V-bracing they are to hold. The upper clamping module applies downward pressure under the weight of the steel beam it holds. Since the contact surface between the upper pad 9 and the lower pad 10 is spherical, it can be arranged to withstand a large amount of force.

[0035] In normal environments, the relative vibration or displacement between the main beam and the supporting beam is relatively small. Therefore, it is only necessary to ensure that the force on the supporting beam is perpendicular. Based on this, the bearing unit can be further designed, as follows: Figure 11 As shown, an annular protrusion can be set on the base. The inner diameter of the annular protrusion is slightly larger than the diameter of the bearing unit, so that the bearing unit can move freely within the range formed by the annular protrusion. When the main beam or the V-bracing is displaced due to thermal expansion and contraction or vibration, the force on the supporting beam is vertical because the bearing unit has displacement margin in the horizontal direction.

[0036] In use, the clamping plate 7 is initially perpendicular to the web of the I-beam 8 to be clamped. At this point, the mounting bracket 2 in the lower clamping module is fastened onto the lower steel beam, and then the upper clamping module is placed on top of it, with the upper steel beam placed inside the upper clamping module. At this point, the upper and lower clamping modules are aligned vertically and positioned at their intersection. Tightening the screws 6 on each mounting bracket 2 causes the screws 6 to pull the rack 5 outwards, causing the gears 4 on both sides to rotate in opposite directions. The gears 4, via the rotating shaft 3, drive the clamping plate 7 to gradually approach the web of the steel beam until they are tightly clamped. At this point, the steel beam is clamped by multiple clamping plates 7. In the above description, the clamping plate... The lower edge of clamp 7 is inclined, and the lower edge of clamp 7 exerts downward pressure on the flange of the steel beam, so that the flange of the steel beam is tightly clamped to the mounting base 1. Finally, tighten each bolt 14. The bolt 14 in the upper clamping module can rotate to drive the nut 13 on it to rotate. When the nut 13 reaches the lower end of the cavity 12, continue to tighten the bolt 14. At this time, the rotating shaft 3 moves downward. The rotating shaft 3, through clamp 7, presses the flange of the I-beam 8 downward and further clamps it firmly to the mounting base 1. The head of the clamping bolt 14 on the lower side is on the upper side of the arc groove 16 in the mounting plate. Therefore, tightening these bolts 14 can fix the upper and lower clamping modules into a whole.

[0037] In extreme cases, such as when used in areas with large temperature variations, due to the large axial expansion and contraction of the steel beam, it is necessary to adjust the clamping position and re-fix the cross nodes. Specifically, the screw 6 is rotated in the opposite direction to move the rack 5 closer to the side of the steel beam. This causes the rotating shaft 3 on it to gradually loosen the web of the steel beam by driving the clamping plate 7. At this time, the steel beam is released, and the upper and lower clamping modules are moved to the appropriate positions to continue tightening.

[0038] The main point of this invention is that the spherical surface not only realizes the function of the traditional triangular plate for limiting, but also can return to its original position autonomously when dealing with vibration, that is, the centering function. In addition, the clamping unit can be firmly clamped on the steel beam through a sufficiently large contact area and has the characteristic of being detachable, so the clamping position can be easily adjusted later, which has the function of adjustment.

[0039] In this invention, the L-shaped structure formed by the rotating shaft 3 and the clamping plate 7 has elastic properties. The folded edges 18 on the upper and lower sides of the clamping plate 7 can also ensure that the upper and lower sides of the clamping plate 7 have sufficient contact area with the flange of the I-beam 8, thus enabling the clamping unit to be firmly fixed on the steel beam, while having high self-adjustment performance.

[0040] The main beams, spur beams, and supporting beams mentioned above are all made of I-beams.

[0041] This invention features an ingenious structure. By improving the stress environment between the upper and lower side beams and increasing the contact area between the fasteners and the I-beam 8, it employs an adjustable structure to achieve adaptive adjustment of the fixed nodes, ensuring that the intersection nodes are stable and durable. It can adapt to nodes with different intersection angles, is convenient and quick, has strong adaptability, does not require complex welding operations, and meets the needs of modern construction technology.

Claims

1. A fixing structure for the supporting beam and the main beam in a large-span prefabricated steel structure, characterized in that, The device includes two clamping modules, one upper and one lower. Each clamping module includes a mounting base (1) and a mounting bracket (2) on each of the front and rear sides. The mounting bracket (2) has two vertical and rotatable shafts (3) on its inner side, which can move up and down. A gear (4) is located on the upper side of each shaft (3), and the gear (4) is connected to the shaft (3) via a spline structure. The gear (4) is rotatably mounted on the mounting bracket (2). A rack (5) is provided between the two gears (4) on the same mounting bracket (2), and a screw (6) is mounted on the rack (5). (6) It is screwed onto the mounting bracket (2) by a thread; the screw (6) can drive two gears (4) to rotate synchronously in opposite directions via the rack (5), thereby driving two rotating shafts (3) to rotate synchronously in opposite directions; there is a clamping plate (7) on the side of the rotating shaft (3) away from the mounting bracket (2), the clamping plate (7) is folded into an L-shaped plate near the edge of the rotating shaft (3) and fixed together with the rotating shaft (3); the rack (5) can drive the rotating shaft (3) to rotate synchronously in opposite directions via the two gears (4) on both sides, thereby achieving that the clamping plate (7) is in close contact with the web of the I-beam (8); A pressure-bearing unit is provided between the two clamping modules. The pressure-bearing unit includes an upper pad (9) and a lower pad (10). The upper pad (9) is fixed on the mounting base (1) of the upper clamping module, and the lower pad (10) is fixed on the mounting base (1) of the lower clamping module. The lower end surface of the upper pad (9) is a convex spherical surface, and the upper end surface of the lower pad (10) is a concave spherical surface. The lower edge of the clamp (7) is inclined upward away from the shaft (3). When the shaft (3) drives the clamp (7) to press against the web of the I-beam (8), the lower edge of the clamp (7) applies pressure to the I-beam (8), causing the flange of the I-beam (8) to be clamped by the clamp (7) and the mounting base (1). The rotating shaft (3) is provided with a hexagonal cavity (12), and the bottom plate is provided with a bolt (14) and nut (13) structure, wherein the nut (13) is placed in the cavity (12) and does not detach from the rotating shaft (3), and the end of the bolt (14) is placed on the side of the bottom plate away from the rotating shaft (3); turning the bolt (14) can control the up and down movement of the rotating shaft (3); Two fixing plates (15) are fixed on the lower end face of the mounting base (1) located on the upper side. An arc groove (16) is provided on the fixing plate (15). The end of the bolt (14) in the clamping structure located on the lower side is placed on the upper side of the arc groove (16). Tightening the bolt (14) in the clamping module on the lower side can make the upper and lower base plates form a whole.

2. The fixing structure between the supporting beam and the main beam in a large-span prefabricated steel structure according to claim 1, characterized in that, The spline structure includes a spline tube (11), which is fixed to the lower end of the gear (4). The upper end of the rotating shaft (3) has a rectangular cross section, which is matched with the spline of the spline tube (11). The upper end of the rotating shaft (3) is inserted into the spline tube (11). A compression spring is connected between the rotating shaft (3) and the spline tube (11).

3. The fixing structure between the supporting beam and the main beam in a large-span prefabricated steel structure according to claim 1, characterized in that, The mounting bracket (2) is fixed with a threaded cylinder (17) corresponding to the screw (6), the screw (6) is placed inside the threaded cylinder (17), the rack (5) is cylindrical, and the teeth on the rack (5) are annular teeth.

4. The fixing structure between the supporting beam and the main beam in a large-span prefabricated steel structure according to claim 1, characterized in that, The angle between the clamping plate (7) and the L-shaped plate formed by the folding of the rotating shaft (3) is an obtuse angle.

5. The fixing structure between the supporting beam and the main beam in a large-span prefabricated steel structure according to claim 4, characterized in that, The clamp (7) is provided with folded edges (18) on both the upper and lower sides, wherein the folded edge (18) on the lower side of the clamp (7) is at an obtuse angle to the clamp (7).

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