Fixing structure of joist and main beam in large-span assembly type steel structure

Abstract

The invention provides a fixing structure for a joist and a main beam in a large-span assembly type steel structure, and effectively solves the problems that in the prior art, stress distribution at cross joints of the steel structure is unreasonable, the contact area between a fastener and the steel structure is limited, and adaptive adjustment cannot be conducted on site. According to the technical scheme, the device comprises an upper clamping module and a lower clamping module, each clamping module comprises a mounting base, the front side and the rear side of each clamping module are each provided with a mounting frame, and two rotating shafts are arranged on the inner sides of the mounting frames and can move up and down; gears are arranged on the upper sides of the rotating shafts, the gears are connected with the rotating shafts through spline structures, racks are arranged between the two gears located on the same mounting frame, and screws are arranged on the racks; the edge, close to the rotating shaft, of the clamping plate is folded to form an L-shaped plate which is fixed together with the rotating shaft; a pressure bearing unit is arranged between the two clamping modules and comprises an upper cushion plate and a lower cushion plate. The lower end face of the upper cushion plate is a convex spherical surface, and the upper end face of the lower cushion plate is a concave spherical surface.

Description

Technical Field

[0001] The invention relates to the technical field of large-span assembled steel structure buildings, in particular to a fixing structure of a joist and a main beam in a large-span assembled steel structure. Background Art

[0002] In the construction of prefabricated steel structure buildings, the side braces, main beams and the eight-shaped braces on both sides are fixed on the joists, where the main beams and joists are vertically crossed, and the side braces and joists are obliquely crossed. In the prior art, the joists and side braces are fixed together as follows: Figure 1 As shown, before fixing, it is necessary to weld triangular plates on both sides of the corner brace to achieve position limiting, and then tighten the two 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 responds to natural vibrations, the triangular plate is subjected to more lateral forces, and the triangular plate will deform slightly, causing looseness at the connection point. At the same time, once the triangular steel is welded, it means that it cannot be adjusted later. However, the steel structure will expand and contract in an alternating hot and cold environment, further aggravating the deformation of the triangular plate or even falling off. After thermal expansion and contraction, the force exerted by the upper beam on the lower support beam is tilted, further aggravating the instability of the node. In addition, due to the complex force on the upper beam, the direction of the force exerted by the upper beam on the support beam is not vertical, which is prone to local deformation, further accelerating the loosening and shaking of the connection node, greatly weakening the seismic performance and stability of the overall building structure. There is no better way in the existing technology except to regularly inspect and tighten the connection nodes. However, simple tightening is just further clamping in the original position, which can only achieve stability for a period of time and invisibly increases the deformation of the I-beam, which is detrimental to the construction performance of the entire building.

[0003] In order to solve the above problems, a fixing structure for support beams and main beams in a large-span prefabricated steel structure is provided. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the existing technology, the present invention provides a fixing structure for the support beam and the main beam in a large-span prefabricated steel structure, which effectively solves the problems in the existing technology of unreasonable force distribution at the intersection nodes of the steel structure, limited contact area between the fasteners and the steel structure, and inability to perform adaptive adjustment on site.

[0005] The technical solution is to include two upper and lower clamping modules, each of which includes a mounting base, a mounting bracket on each of the front and rear sides, and two vertical and rotatable shafts inside the mounting bracket, which can move up and down; a gear is provided on the upper side of the rotating shaft, and the gear and the rotating shaft are connected by a spline structure, and the gear is rotatably mounted on the mounting bracket, and a rack is provided between the two gears on the same mounting bracket, and the rack has a screw, which is screwed on the mounting bracket through a thread; screwing the screw can drive the two gears to rotate synchronously in opposite directions through the rack, and thus drive the two rotating shafts to rotate synchronously in opposite directions; a splint is provided on the side of the rotating shaft away from the mounting bracket, and the edge of the splint close to the rotating shaft is folded to form an L-shaped plate and fixed to the rotating shaft; the rack can drive the rotating shaft to rotate synchronously in opposite directions through the two gears on both sides thereof, thereby achieving close contact between the splint and the web of the I-beam; A pressure-bearing unit is arranged between the two clamping modules, and the pressure-bearing unit includes an upper pad and a lower pad. The upper pad is fixed on the mounting seat in the upper clamping module, and the lower pad is fixed on the mounting frame 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 cylinder, which is fixed to the lower end of the gear, and the upper end of the rotating shaft has a rectangular cross-section, which cooperates with the splines of the spline cylinder, and the upper end of the rotating shaft is inserted into the spline cylinder; a compression spring is connected between the rotating shaft and the spline cylinder.

[0007] Preferably, the end of the lower edge of the clamp away from the rotating shaft is inclined upward. When the rotating shaft drives the clamp to press against the web of the I-beam, the lower edge of the clamp exerts pressure on the I-beam so that the flange of the I-beam is clamped by the clamp and the mounting seat.

[0008] Preferably, a hexagonal cavity is provided in the rotating shaft, and a bolt and nut structure is provided on the bottom plate, wherein the nut is placed in the cavity and is not separated from the rotating shaft, and the end of the bolt is placed on the side of the bottom plate away from the rotating shaft; screwing the bolt can control the up and down movement of the rotating shaft.

[0009] Preferably, two fixing plates are fixed on the lower end surface of the mounting seat on the upper side, and an arc groove is provided on the fixing plate, wherein the end of the bolt in the clamping structure on the lower side is placed on the upper side of the arc groove; screwing the bolt in the clamping module on the lower side can form a whole between the upper and lower base plates.

[0010] Preferably, a threaded barrel corresponding to the screw is fixed on the mounting frame, the screw is placed in the threaded barrel, 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 folding the rotating shaft is an obtuse angle.

[0012] Preferably, the upper and lower sides of the splint are both provided with folded edges, wherein the folded edge of the lower side of the splint forms an obtuse angle with the splint.

[0013] The present invention has an ingenious structure. By improving the stress environment between the upper beam and the lower beam, the contact area between the fasteners and the I-beam is increased, and an adjustable structure is adopted to achieve adaptive adjustment of the fixed nodes, thereby ensuring that the cross nodes are stable and durable. It can adapt to nodes crossing at different angles, is convenient and fast, has strong adaptability, does not require complicated welding operations, and meets the needs of modern construction technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model relates to a fixing structure between an eight-shaped support and a supporting beam in the prior art.

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

[0016] Figure 3 It is an overall schematic diagram of the present invention.

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

[0018] Figure 5 A three-dimensional diagram of the clamping module in the present invention.

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

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

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

[0022] Figure 9 This is a structural diagram of the rotating shaft and the gears, splints, etc. on it in the present invention.

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

[0024] Figure 11 This is a schematic diagram of the installation of the pressure-bearing unit in the present invention. DETAILED DESCRIPTION

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

[0026] Depend on Figures 1 to 11The present invention is given, which includes two upper and lower clamping modules, and the clamping module includes a mounting base 1, a mounting bracket 2 on each of the front and rear sides, and two vertical and rotatable rotating shafts 3 inside the mounting bracket 2, which can move up and down; a gear 4 is provided on the upper side of the rotating shaft 3, and the gear 4 is connected to the rotating shaft 3 through a spline structure, and the gear 4 is rotatably mounted on the mounting bracket 2, and a rack 5 is provided between the two gears 4 on the same mounting bracket 2. A screw 6 is provided on the rack 5, and the screw 6 is screwed on the mounting bracket 2 through a thread; screwing the screw 6 can drive the two gears 4 to rotate synchronously in the opposite direction through the rack 5, and then drive the two rotating shafts 3 to rotate synchronously in the opposite direction; a splint 7 is provided on the side of the rotating shaft 3 away from the mounting bracket 2, and the edge of the splint 7 close to the rotating shaft 3 is folded to form an L-shaped plate and fixed to the rotating shaft 3; the rack 5 can drive the rotating shaft 3 to rotate synchronously in the opposite direction through the two gears 4 on both sides thereof, thereby realizing that the splint 7 is in close contact with the web of the I-beam 8; A pressure-bearing unit is provided between the two clamping modules, and the pressure-bearing unit includes an upper pad 9 and a lower pad 10. The upper pad 9 is fixed on the mounting seat 1 in the upper clamping module, and the lower pad 10 is fixed on the mounting frame 2 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 to enable the gear 4 to drive the rotating shaft 3 to rotate without affecting the up and down movement of the rotating shaft 3, the spline structure includes a spline cylinder 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 cooperates with the splines of the spline cylinder 11. The upper end of the rotating shaft 3 is inserted into the spline cylinder 11; a compression spring is connected between the rotating shaft 3 and the spline cylinder 11.

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

[0029] In order to further clamp the flange of the I-beam 8 after the splint 7 clamps the web of the I-beam 8, a hexagonal cavity 12 is provided in the rotating shaft 3, and a bolt 14 and nut 13 structure is provided on the bottom plate, wherein the nut 13 is placed in the cavity 12 and is not separated 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; screwing the bolt 14 can control the up and down movement of the rotating shaft 3.

[0030] In order to further strengthen the integrity of the entire connection structure, and at the same time to limit the collision intensity between the two modules during a strong earthquake, and to adapt to cross nodes at different angles, two fixing plates 15 are fixed on the lower end surface of the mounting seat 1 on the upper side, and an arc groove 16 is provided on the fixing plate 15, wherein the end of the bolt 14 in the clamping structure on the lower side is placed on the upper side of the arc groove 16; screwing the bolt 14 in the clamping module on the lower side can form a whole between the upper and lower base plates.

[0031] A threaded barrel 17 corresponding to the screw rod 6 is fixed on the mounting frame 2 , and the screw rod 6 is placed in the threaded barrel 17 . The rack 5 is cylindrical, and the teeth on the rack 5 are annular teeth.

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

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

[0034] Since both the main beam and the S-shaped support have their own weight, in an environment with a small temperature difference or no strong earthquake, it is not necessary to fix the upper and lower clamping modules into one body, and the fixing plate 15 can be eliminated. The upper and lower clamping modules only need to clamp the main beam or supporting beam or S-shaped support to be clamped. The upper clamping module applies downward pressure under the deadweight of the steel beam clamped therein. Since the contact surface between the upper pad 9 and the lower pad 10 is a spherical surface, the force distribution can be greatly improved.

[0035] In a normal environment, the relative vibration or displacement between the main beam and the joist is relatively small, so it is only necessary to ensure that the force on the joist is vertical. Based on this, the pressure unit can be further designed, as shown in the following example: Figure 11 As shown, an annular protrusion can be provided on the base, and the inner diameter of the annular protrusion is slightly larger than the diameter of the pressure-bearing unit, so that the pressure-bearing unit can move freely within the range formed by the annular protrusion. When the main beam or the S-shaped support is displaced due to thermal expansion and contraction or vibration, the pressure-bearing unit has a displacement margin in the horizontal direction, so the force acting on the supporting beam is vertical.

[0036] When in use, the clamping plate 7 in the initial state is perpendicular to the web of the I-beam 8 to be clamped. At this time, the mounting frame 2 in the lower clamping module is buckled on the lower steel beam, and then the upper clamping module is placed on it, and the upper steel beam is placed in the upper clamping module. At this time, the upper and lower clamping modules are aligned up and down and are just at the intersection; screw the screw 6 on each mounting frame 2, and the screw 6 drives the rack 5 outward to be pulled out, so that the gears 4 on both sides rotate in the opposite direction, and the gear 4 drives the clamping plate 7 on it through the rotating shaft 3 to gradually approach the web of the steel beam until it is tightly clamped. At this time, the steel beam is clamped by multiple clamping plates 7; in the above, the clamping plates The lower edge of 7 is inclined, and the lower edge of the clamping plate 7 produces a downward pressure on the flange of the steel beam, so that the flange of the steel beam is tightly attached to the mounting seat 1 to achieve clamping; finally, each bolt 14 is screwed, and the rotation of the bolt 14 in the upper clamping module can drive the nut 13 thereon to rotate. When the nut 13 reaches the lower end of the cavity 12, the bolt 14 is continued to be screwed. At this time, the rotating shaft 3 moves downward, and the rotating shaft 3 presses the flange of the I-beam 8 downward through the clamping plate 7 to further clamp it firmly with the mounting seat 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, so screwing these bolts 14 can fix the upper and lower clamping modules as a whole.

[0037] In extreme cases, such as when used in areas with large temperature changes, 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 node. Specifically: rotate the screw 6 in the opposite direction to drive the rack 5 to move closer to one side of the steel beam, so that the rotating shaft 3 on it drives the clamping plate 7 to gradually loosen the web of the steel beam. At this time, the steel beam is released, and the upper and lower clamping modules are moved to the appropriate position to continue tightening.

[0038] The main points of the present invention are that the spherical surface not only realizes the function of traditional triangle plate limitation, but also can automatically return to its original position when responding to 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 a detachable feature, so that the clamping position can be adjusted later, and it has an adjustable function.

[0039] In the present invention, the L-shaped structure composed of the rotating shaft 3 and the upper clamping plate 7 has elastic properties, and 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 flanges of the I-beam 8, thereby enabling the clamping unit to be firmly fixed on the steel beam and at the same time having high self-adjustment performance.

[0040] The above-mentioned main beam, eight-shaped support beam, support beam and other steel beams are all made of I-beam 8.

[0041] The present invention has an ingenious structure. By improving the stress environment between the upper beam and the lower beam, the contact area between the fastener and the I-beam 8 is increased, and an adjustable structure is adopted to achieve adaptive adjustment of the fixed node, thereby ensuring that the cross node is stable and durable, and can adapt to nodes crossing at different angles. It is convenient, fast, and has strong adaptability, does not require complicated welding operations, and meets the needs of modern construction technology.

Claims

1. A fixing structure for joists and main beams in a large-span assembled steel structure, characterized in that: The invention comprises two clamping modules, one above the other, wherein the clamping module comprises a mounting seat (1), a mounting frame (2) on each of the front and rear sides, two vertical and rotatable shafts (3) on the inner side of the mounting frame (2), and the shafts (3) can move up and down; a gear (4) is provided on the upper side of the shaft (3), the gear (4) and the shaft (3) are connected via a spline structure, the gear (4) is rotatably mounted on the mounting frame (2), a rack (5) is provided between the two gears (4) on the same mounting frame (2), a screw (6) is provided on the rack (5), and the screw (6) is screwed onto the mounting frame (2) through a thread; the screw rod (6) can drive the two gears (4) to rotate synchronously in opposite directions through the rack (5), thereby driving the two rotating shafts (3) to rotate synchronously in opposite directions; a splint (7) is provided on the side of the rotating shaft (3) away from the mounting frame (2), and the edge of the splint (7) close to the rotating shaft (3) is folded to form an L-shaped plate and fixed to the rotating shaft (3); the rack (5) can drive the rotating shaft (3) to rotate synchronously in opposite directions through the two gears (4) on both sides thereof, thereby achieving close contact between the splint (7) and the web of the I-beam (8); A pressure-bearing unit is provided between the two clamping modules, and the pressure-bearing unit comprises an upper pad (9) and a lower pad (10), wherein the upper pad (9) is fixed on the mounting seat (1) in the upper clamping module, and the lower pad (10) is fixed on the mounting frame (2) 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.

2. The fixing structure of the joist and main beam in a large-span assembled steel structure according to claim 1 is characterized in that: The spline structure includes a spline cylinder (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 cooperates with the splines of the spline cylinder (11). The upper end of the rotating shaft (3) is inserted into the spline cylinder (11); a compression spring is connected between the rotating shaft (3) and the spline cylinder (11).

3. The fixing structure of the joist and main beam in a large-span assembled steel structure according to claim 1 is characterized in that: The end of the lower edge of the clamping plate (7) away from the rotating shaft (3) is inclined upward. 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 by the clamping plate (7) and the mounting seat (1).

4. The fixing structure of the joist and main beam in a large-span assembled steel structure according to claim 3 is characterized in that: A hexagonal cavity (12) is provided in the rotating shaft (3), and a bolt (14) and nut (13) structure is provided on the bottom plate, wherein the nut (13) is placed in the cavity (12) and is not separated 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); screwing the bolt (14) can control the up and down movement of the rotating shaft (3).

5. A fixing structure for joists and main beams in a large-span assembled steel structure according to any one of claims 1 to 4, characterized in that: Two fixing plates (15) are fixed on the lower end surface of the mounting seat (1) on the upper side, and an arc groove (16) is provided on the fixing plate (15), wherein the end of the bolt (14) in the clamping structure on the lower side is placed on the upper side of the arc groove (16); screwing the bolt (14) in the clamping module on the lower side can form a whole between the upper and lower base plates.

6. The fixing structure of the joist and main beam in a large-span assembled steel structure according to claim 1 is characterized in that: A threaded barrel (17) corresponding to the screw rod (6) is fixed on the mounting frame (2), and the screw rod (6) is placed in the threaded barrel (17). The rack (5) is cylindrical, and the teeth on the rack (5) are annular teeth.

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

8. The fixing structure of the joist and main beam in a large-span assembled steel structure according to claim 7, characterized in that: The upper and lower sides of the splint (7) are both provided with folded edges (18), wherein the folded edge (18) on the lower side of the splint (7) forms an obtuse angle with the splint (7).

Images