An assembled building steel structure

Abstract

The invention discloses an assembled building steel structure, comprising two steel sections, a placement cavity is formed at the top of the side wall of the steel section, the side walls of the two positioning blocks facing each other are arranged in abutment with each other, a sliding groove is formed in the side wall of the positioning block in the first transverse tube, a rubber pad is arranged in the placement cavity, the rubber pad is fixedly connected to the inner top surface of the first transverse tube and the second transverse tube respectively, the rubber pad can limit the push rod, the inner cross-section of the threaded cylinder is circular, the top end of the L-shaped sliding rod is fixedly connected to a frame, the frame is slidably sleeved on the rotating shaft, a compression spring is sleeved on the first sliding rod, the compression spring is arranged between the two limiting rings, the two ends of the compression spring are respectively fitted with the side walls of the first sliding rod and the limiting ring, the cross-section of the first sliding rod is Z-shaped, the curvature range of the arc-shaped rack is 90°-150°, it cannot be rotated and loosened, and a positioning mechanism is provided to limit the first transverse tube and the second transverse tube, and the first transverse tube and the second transverse tube can also be rotated into the placement cavity, so as to facilitate the transportation of the steel section.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to an assembled building steel structure. Background Art

[0002] Prefabricated building steel structure is a building structure composed of steel materials, mainly including steel sections, steel plates, steel columns and steel trusses. Due to its advantages of light weight, convenient construction and recyclable reuse, it is widely used in large-scale construction fields such as large factories and stadiums. At present, most prefabricated building steel structures are usually assembled and reinforced by threaded connections or rivet connections during the assembly and connection process. Threaded connections are prone to loosening after long-term use, resulting in connection failure and accidents. The fixed connection between the steel section and the first cross tube and the second cross tube occupies a large space and is not convenient for the transportation of the steel section. Summary of the invention

[0003] In order to solve the above-mentioned problems, the present invention provides an assembled building steel structure.

[0004] The present invention is achieved through the following technical solutions:

[0005] The cam is annularly provided with a first end of a second end of a sprocket wheel, and the second end of a sprocket wheel is provided with a second end of a sprocket wheel. The second end of the second cam is fixedly connected to the second cam by the second cam, and the second cam is connected to the first cam and the second cam by the second cam.

[0006] Preferably, the inner cross-section of the threaded barrel is circular, the outer cross-section of the threaded barrel is square, and the plane where the outer wall of the threaded barrel is located is in the same plane as the plane where the outer wall of the first transverse tube is located.

[0007] Preferably, the mechanism for limiting the unidirectional rotation of the threaded tube includes two bevel gear rings slidably arranged in the slide groove, the two bevel gear rings are meshed with each other, a plurality of connecting rods are fixedly connected to the outer ring surface of one of the bevel gear rings, the other end of the connecting rods is fixedly connected to the inner wall of the threaded tube, a plurality of sliding rods are annularly fixedly connected to the side wall of the other bevel gear ring, the other ends of the plurality of sliding rods pass through the positioning block and are fixedly connected to a cross plate, the sliding rod is slidably connected to the positioning block, a tension spring is sleeved on the sliding rod, the two ends of the tension spring are respectively fixedly connected to the positioning block and the cross plate, and the first cross tube The inner bottom surface is fixedly connected to a connecting shaft, and a push ring is rotatably sleeved on the connecting shaft, one end of the push ring passes through a first through slot and fits against the side wall of the horizontal plate, the first through slot is opened on the side wall of the horizontal plate, and the other end of the push ring is fitted with an L-shaped sliding rod, the top end of the L-shaped sliding rod is fixedly connected to a frame, the frame is slidably sleeved on the rotating shaft, one end of the frame is fixedly connected to a second sliding rod, one end of the second sliding rod passes through the first horizontal tube and enters the second through hole, the second sliding rod is slidably connected to the first horizontal tube, and the second through hole is opened on the side wall of the first horizontal tube.

[0008] Preferably, the cross section of one end of the second sliding rod inserted into the second through hole is an arc surface.

[0009] Preferably, the positioning mechanism includes a gear ring fixedly sleeved on the rotating shaft, one side end of the gear ring is meshed with an arc-shaped rack, the side wall of the arc-shaped rack is fixedly connected to a first slide bar, the other end of the first slide bar passes through two limit rings and a cross plate in sequence and penetrates into the first through hole and fits with one end of the push rod, the two limit rings are respectively fixed to the first cross tube and the inner wall of the second cross tube and are slidably connected to the first slide bar, the cross plate is slidably connected to the first slide bar, a compression spring is sleeved on the first slide bar, the compression spring is arranged between the two limit rings, the two ends of the compression spring are respectively fitted with the first slide bar and the side wall of the limit ring, and the cross-section of the first slide bar is Z-shaped.

[0010] Preferably, the arc angle of the arc-shaped rack ranges from 90° to 150°.

[0011] Preferably, the support mechanism includes a positioning groove opened in the side wall of the steel section, the positioning groove is communicated with the second dovetail groove, a support rod is hinged in the positioning groove through a pin shaft, the top end of the support rod passes through the second dovetail groove and is inserted into the positioning groove, and the two positioning grooves are respectively opened on the bottom surfaces of the first cross tube and the second cross tube and are inclined.

[0012] Compared with the existing technology, the beneficial effects of the present invention are: a mechanism for limiting the unidirectional rotation of the threaded tube is fixedly connected to the inner wall of the threaded tube at the connection between the first transverse tube and the second transverse tube through the threaded tube, and the threaded tube is limited by the mechanism for limiting the unidirectional rotation of the threaded tube so that the threaded tube can only be rotated to be tightened and cannot be rotated to be loosened, and a positioning mechanism is provided to limit the position of the first transverse tube and the second transverse tube, and the first transverse tube and the second transverse tube can also be rotated into the placement cavity, so as to facilitate the transportation of steel sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the structural diagram of the present invention;

[0014] Figure 2 It is a top view of the structure of the present invention and a partial enlarged view thereof;

[0015] Figure 3 is a bottom view of the structure of the present invention;

[0016] Figure 4 It is a partial enlarged view of part A of the structure of the present invention;

[0017] Figure 5 It is a partial enlarged view of part B of the structure of the present invention;

[0018] Figure 6 is a stereogram of the structure of the present invention;

[0019] Figure 7 It is a structural diagram of the part 11 of the structure of the present invention;

[0020] Figure 8 It is a working schematic diagram of the structure of the present invention and a partial enlarged diagram thereof;

[0021] Fig. 9 It is a working schematic diagram of the structure of the present invention;

[0022] Fig.10 It is a working schematic diagram of the structure of the present invention.

[0023] In the figure: steel section 1, placement cavity 2, rotating shaft 3, first transverse tube 4, second transverse tube 5, clockwork 6, gear ring 7, arc-shaped rack 8, first slide bar 9, limit ring 10, positioning block 11, first through hole 12, push rod 13, compression spring 14, slide groove 15, bevel gear ring 16, connecting rod 17, threaded tube 18, first dovetail block 19, first dovetail groove 20, slide bar 21, transverse plate 22, tension spring 23, connecting shaft 24, push ring 25, first through groove 26, L-shaped slide bar 27, frame 28, second slide bar 29, second through hole 30, rubber pad 31, second through groove 32, support rod 33, positioning groove 34, second dovetail groove 35, second dovetail block 36. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0025] like Figure 1-Figure 10 As shown, an assembled building steel structure includes two steel sections 1, a placement cavity 2 is opened at the top of the side wall of the steel section 1, and the two placement cavities 2 are arranged opposite to each other. A first transverse tube 4 is rotatably connected to one of the placement cavities 2 through a rotating shaft 3, and a second transverse tube 5 is rotatably connected to the other placement cavity 2 through a rotating shaft 3. A spring 6 is fixedly sleeved on the rotating shaft 3. The two springs 6 are respectively arranged in the first transverse tube 4 and the second transverse tube 5 and fixedly connected to the inner surface thereof. The first transverse tube 4 and the second transverse tube 5 are fitted at both ends and are rotatably connected through a threaded tube 18. The inner wall of the threaded barrel 18 is annularly fixedly connected with a plurality of first dovetail blocks 19, the first dovetail blocks 19 are slidably arranged on the side wall of the first dovetail groove 20, the first dovetail groove 20 is opened on the surface of the first transverse tube 4, the first transverse tube 4 and the second transverse tube 5 are respectively fixedly connected with positioning blocks 11, the side walls of the two positioning blocks 11 facing each other are arranged in abutment with each other, the side wall of the positioning block 11 in the first transverse tube 4 is annularly opened with a slide groove 15, the slide groove 15 is provided with a mechanism for limiting the unidirectional rotation of the threaded barrel 18, and the output end of the mechanism for limiting the unidirectional rotation of the threaded barrel 18 It is fixedly connected to the inner wall of the threaded tube 18, a positioning mechanism is fixedly sleeved on the rotating shaft 3 in the first transverse tube 4 and the second transverse tube 5, and a push rod 13 is fixedly connected to the side wall of the positioning block 11. The push rod 13 is slidably inserted into the first through hole 12 and fits with the input end of the positioning mechanism. The movable push rod 13 is inserted into the first through hole 12 to push the positioning mechanism to limit the first transverse tube 4 and the second transverse tube 5 respectively. A second dovetail groove 35 is opened on the side wall of the steel section 1, and the second dovetail groove 35 is arranged below the placement cavity 2, and the two second dovetail grooves 35 are arranged facing each other. The bottom surfaces of the first transverse tube 4 and the second transverse tube 5 are respectively fixedly connected with second dovetail blocks 36, and the second dovetail blocks 36 match the second dovetail grooves 35. A supporting mechanism is hinged on the side wall of the steel section 1, and the output end of the supporting mechanism is inserted into the bottom surfaces of the first transverse tube 4 and the second transverse tube 5 and is slidably connected thereto. The supporting mechanism can support the first transverse tube 4 and the second transverse tube 5. A rubber pad 31 is provided in the placement cavity 2, and the rubber pad 31 is respectively fixedly connected to the inner top surfaces of the first transverse tube 4 and the second transverse tube 5, and the rubber pad 31 can limit the push rod 13.

[0026] Please combine Fig.10 As shown, during use, the device is transported to an appropriate position, and then the shaped steel 1 is slid to make the two shaped steels 1 move in opposition, and the two shaped steels 1 drive the first transverse tube 4 and the second transverse tube 5 to move through the placement cavity 2, and the first transverse tube 4 and the second transverse tube 5 drive the second dovetail block 36 to move and slide out of the corresponding second dovetail groove 35, and then the shaped steel 1 with the second transverse tube 5 is rotated 180°, as shown in FIG. Fig. 9As shown, the second dovetail block 36 is pulled to rotate, and the second dovetail block 36 drives the first transverse tube 4 and the second transverse tube 5 to rotate and slide out of the placement cavity 2. When the first transverse tube 4 and the second transverse tube 5 are in a horizontal state, the rotation stops, as shown in FIG. Figure 8 Then, the two steel sections 1 are brought close to each other, and the steel section 1 drives the first transverse tube 4 and the second transverse tube 5 to move through the rotating shaft 3, and the first transverse tube 4 and the second transverse tube 5 drive the positioning block 11 to move, and the positioning block 11 drives the first through hole 12 and the push rod 13 to move, so that the push rod 13 on one side is inserted into the first through hole 12, and then the threaded barrel 18 is rotated to be threadedly connected with the second transverse tube 5, and the threaded barrel 18 drives the first dovetail block 19 to slide in the first dovetail groove 20, and the threaded barrel 18 drives the mechanism that limits the unidirectional rotation of the threaded barrel 18 to rotate, and at this time, the threaded barrel 1 The rotation direction of 8 is the same as the rotation direction of the mechanism that limits the unidirectional rotation of the threaded tube 18. The threaded tube 18 pulls the second transverse tube 5 to move. The second transverse tube 5 drives the push rod 13 to slide in the first through hole 12 through the positioning block 11 to push the positioning mechanism to work. When one end of the first transverse tube 4 and the second transverse tube 5 are in contact, the movement is notified. At this time, the positioning mechanism realizes the limitation of the first transverse tube 4 and the second transverse tube 5, so that the first transverse tube 4 and the second transverse tube 5 cannot rotate. The rotation support mechanism is inserted into the first transverse tube 4 and the second transverse tube 5 to support them. Figure 1 as shown, and then put the device into use.

[0027] After the use of the device is completed, it needs to be disassembled. First, the supporting mechanism is rotated to enter the first transverse tube 4 and the second transverse tube 5 into the steel section 1 respectively. Then, a screwdriver is used to push the mechanism that limits the unidirectional rotation of the threaded tube 18 to cancel the limit on the threaded tube 18 so that the threaded tube 18 can rotate. Then, the threaded tube 18 is rotated to gradually separate from the second transverse tube 5. At this time, the push rod 13 no longer pushes the positioning mechanism. The positioning mechanism is reset to cancel the limit on the first transverse tube 4 and the second transverse tube 5. Then, the first transverse tube 4 and the second transverse tube 5 are rotated to enter the placement cavity 2 respectively, so that the push rod 13 squeezes the rubber pad 31, and the rubber pad 31 limits the push rod 13. Fig. 9 As shown, one of the steel sections is rotated 1180°, the second dovetail groove 35 is aligned with the second dovetail block 36, and then the two steel sections 1 are moved toward each other, and the steel section 1 indirectly drives the second dovetail block 36 to be inserted into the second dovetail groove 35, as shown. Fig.10 , the disassembly of the device is realized, which facilitates the transportation of the steel section 1.

[0028] The inner cross-section of the threaded barrel 18 is circular, the outer cross-section of the threaded barrel 18 is square, and the plane where the outer wall of the threaded barrel 18 is located is in the same plane as the plane where the outer wall of the first transverse tube 4 is located, increasing the width of the contact surface between the outer cross-section of the first transverse tube 4 and the threaded barrel 18 and the equipment, thereby increasing the supporting strength.

[0029] Please combine Figure 1 , Figure 2 , Figure 4 , Figure 7 , Figure 8 As shown, an embodiment of a mechanism for limiting the unidirectional rotation of the threaded cylinder 18, the mechanism for limiting the unidirectional rotation of the threaded cylinder 18 includes two bevel gear rings 16 slidably arranged in the slide groove 15, the two bevel gear rings 16 are meshed with each other, a plurality of connecting rods 17 are fixedly connected to the outer ring surface of one of the bevel gear rings 16, the other end of the connecting rod 17 is fixedly connected to the inner wall of the threaded cylinder 18, a plurality of sliding rods 21 are annularly fixedly connected to the side wall of the other bevel gear ring 16, the other ends of the plurality of sliding rods 21 pass through the positioning block 11 and are fixedly connected to a cross plate 22, the sliding rod 21 is slidably connected to the positioning block 11, a tension spring 23 is sleeved on the sliding rod 21, and the two ends of the tension spring 23 are respectively connected to the positioning block 11 and the cross plate 22 is fixedly connected, a connecting shaft 24 is fixedly connected to the inner bottom surface of the first transverse tube 4, a push ring 25 is rotatably sleeved on the connecting shaft 24, one end of the push ring 25 passes through the first through slot 26 and fits with the side wall of the transverse plate 22, the first through slot 26 is opened on the side wall of the transverse plate 22, the other end of the push ring 25 is fitted with an L-shaped slide bar 27, the top of the L-shaped slide bar 27 is fixedly connected to a frame 28, the frame 28 is slidably sleeved on the rotating shaft 3, one end of the frame 28 is fixedly connected to a second slide bar 29, one end of the second slide bar 29 passes through the first transverse tube 4 and passes into the second through hole 30, the second slide bar 29 is slidably connected to the first transverse tube 4, and the second through hole 30 is opened on the side wall of the first transverse tube 4.

[0030] Please combine Figure 1 As shown, during use, when the rotating threaded barrel 18 is threadedly connected to the second cross tube 5, the threaded barrel 18 drives the connecting rod 17 to rotate, and the connecting rod 17 drives the bevel gear ring 16 connected thereto to rotate, and the rotating bevel gear ring 16 pushes the other bevel gear ring 16 to move laterally in the slide groove 15, and the other bevel gear ring 16 drives the sliding rod 21 to slide, and the sliding rod 21 drives the cross plate 22 to move and pull the tension spring 23 to deform. Since the teeth on the bevel gear ring 16 are right-angled triangles, the two bevel gear rings 16 can only rotate in one direction, thereby realizing the limitation of the connecting rod 17 so that the connecting rod 17 cannot rotate in the opposite direction, and the connection rod 17 cannot rotate so that the threaded barrel 18 cannot rotate in the opposite direction, thereby realizing the one-way limitation of the threaded barrel 18 so that the threaded barrel 18 cannot rotate in the opposite direction.

[0031] When it is necessary to disassemble the second transverse tube 5 and the threaded tube 18, first use a screwdriver to insert into the second through hole 30 to push the second slide bar 29 to move, the second slide bar 29 drives the frame 28 to move, the frame 28 drives the L-shaped slide bar 27 to move, the L-shaped slide bar 27 moves to push the push ring 25 to rotate on the connecting shaft 24, the push ring 25 rotates to push the transverse plate 22 to move, the transverse plate 22 drives the bevel gear ring 16 fixed to the slide bar 21 to move and separate from the other bevel gear ring 16 through the slide bar 21, cancel the other bevel gear ring 16, so that the other bevel gear ring 16 can rotate, and then rotate the threaded tube 18 and the second transverse tube 5 is separated, the threaded barrel 18 drives the connecting rod 17 to rotate, and the connecting rod 17 drives the bevel gear ring 16 fixed thereto to rotate. When the threaded barrel 18 is separated from the second transverse tube 5, the screwdriver is pulled out, and the deformed tension spring 23 drives the transverse plate 22 to move, and the transverse plate 22 drives the slide bar 21 to move, and the slide bar 21 drives the bevel gear ring 16 fixed thereto to move and engage with the other bevel gear ring 16 to achieve one-way limiting of the other bevel gear ring 16, and the transverse plate 22 drives the push ring 25 to rotate, and the push ring 25 drives the L-shaped slide bar 27 to move and reset, and the L-shaped slide bar 27 drives the second slide bar 29 to move and reset through the frame 28.

[0032] The cross section of one end of the second sliding rod 29 inserted into the second through hole 30 is an arc surface.

[0033] Please combine Figure 5 As shown, during use, when the first transverse tube 4 and the second transverse tube 5 rotate, the first transverse tube 4 and the second transverse tube 5 drive the second slide bar 29 to rotate, and the cross-section of one end of the second slide bar 29 inserted into the second through hole 30 is an arc surface, which facilitates the second slide bar 29 to slide out of the second through hole 30.

[0034] Please combine Figure 1 , Figure 2 , Figure 5 , Figure 8 As shown, an embodiment of the positioning mechanism includes a gear ring 7 fixedly sleeved on the rotating shaft 3, one side end of the gear ring 7 is meshed with an arc-shaped rack 8, the side wall of the arc-shaped rack 8 is fixedly connected to a first slide bar 9, the other end of the first slide bar 9 passes through two limit rings 10 and a cross plate 22 in sequence and penetrates into the first through hole 12 and fits with one end of a push rod 13, the two limit rings 10 are respectively fixed on the inner walls of the first cross tube 4 and the second cross tube 5 and are slidably connected to the first slide bar 9, the cross plate 22 is slidably connected to the first slide bar 9, a compression spring 14 is sleeved on the first slide bar 9, the compression spring 14 is arranged between the two limit rings 10, the two ends of the compression spring 14 are respectively fitted with the side walls of the first slide bar 9 and the limit ring 10, and the cross section of the first slide bar 9 is Z-shaped.

[0035] Please combine Figure 5As shown, during use, when the threaded barrel 18 is rotated and threadedly connected with the second transverse tube 5, the threaded barrel 18 indirectly drives the push rod 13 to be inserted into the first through hole 12 to push the first slide bar 9 to move, and the first slide bar 9 drives the arc-shaped rack 8 to move and gradually mesh with the gear ring 7. When the first transverse tube 4 and one end of the second transverse tube 5 are fitted together, the arc-shaped rack 8 is meshed with the gear ring 7, as shown in FIG. Figure 5 As shown, at this time, the gear ring 7 limits the arcuate rack 8 appropriately so that the arcuate rack 8 cannot rotate, the arcuate rack 8 cannot rotate, so that the first slide bar 9 cannot rotate, the first slide bar 9 cannot rotate so that the limiting ring 10 cannot rotate, the limiting ring 10 cannot rotate so that the first cross tube 4 and the second cross tube 5 cannot rotate, thereby achieving the limitation of the first cross tube 4 and the second cross tube 5.

[0036] When the threaded tube 18 rotates and separates from the second transverse tube 5, the second transverse tube 5 indirectly drives the first through hole 12 in the push rod 13 to slide out and cancel the limit on the first slide bar 9. At this time, the compression spring 14 pushes the first slide bar 9 to move and reset. The first slide bar 9 drives the arc-shaped rack 8 to move and separate from the gear ring 7. The gear ring 7 cancels the limit on the arc-shaped rack 8 so that the arc-shaped rack 8 can rotate, thereby indirectly allowing the first transverse tube 4 and the second transverse tube 5 to rotate. Figure 8 shown.

[0037] The arc angle of the arc-shaped rack 8 is in the range of 90°-150°, which increases the contact area between the arc-shaped rack 8 and the gear ring 7, thereby increasing the stability of the connection between the rack 8 and the gear ring 7.

[0038] Please combine Figure 1 , Figure 2 , Figure 6 , Fig. 9 As shown, an embodiment of the support mechanism includes a positioning groove 34 opened on the side wall of the steel section 1, the positioning groove 34 is communicated with the second dovetail groove 35, a support rod 33 is hinged in the positioning groove 34 through a pin shaft, the top end of the support rod 33 passes through the second dovetail groove 35 and is inserted into the positioning groove 34, and the two positioning grooves 34 are respectively opened on the bottom surfaces of the first cross tube 4 and the second cross tube 5 and are inclined.

[0039] Please combine Figure 1 As shown, during use, when the first transverse tube 4 and the second transverse tube 5 are needed to be supported, the support rod 33 is first rotated so that one end of the support rod 33 slides out from the second through groove 32 and the second dovetail groove 35 in turn, and then one end of the support rod 33 is inserted into the positioning groove 34 to support the first transverse tube 4 and the second transverse tube 5. When the first transverse tube 4 and the second transverse tube 5 are no longer needed to be supported, the support rod 33 is pulled out from the positioning groove 34, and then the support rod 33 is rotated into the second through groove 32.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An assembled building steel structure, comprising two types of steel, characterized in that: The top of the steel section side wall is provided with a placement cavity, and the two placement cavities are arranged opposite to each other, one of the placement cavities is rotatably connected to the first transverse tube through a rotating shaft, and the other placement cavity is rotatably connected to the second transverse tube through the rotating shaft. A spring is fixedly sleeved on the rotating shaft, and the two springs are respectively arranged in the first transverse tube and the second transverse tube and fixedly connected to their inner surfaces, and the first transverse tube and the second transverse tube are respectively fitted at two ends and rotatably connected through a threaded tube. A plurality of first dovetail blocks are annularly fixedly connected to the inner wall of the threaded tube, and the first dovetail block is slidably arranged on the side wall of the first dovetail groove, and the first dovetail groove is opened on the surface of the first transverse tube, and positioning blocks are respectively fixedly connected in the first transverse tube and the second transverse tube, and the side walls of the two positioning blocks facing each other are fitted with each other, and the side wall of the positioning block in the first transverse tube is annularly provided with a sliding groove, and a mechanism for limiting the unidirectional rotation of the threaded tube is provided in the sliding groove, and the output end of the mechanism for limiting the unidirectional rotation of the threaded tube is fixedly connected to the inner wall of the threaded tube. The second end of the second cam is fixedly connected to the second cam by a toothed connection, and the toothed connection is connected with the toothed connection of the wheel hub, and the toothed connection is connected with the toothed connection of the wheel hub.

2. The assembled steel structure according to claim 1 is characterized in that: The inner cross-section of the threaded barrel is circular, the outer cross-section of the threaded barrel is square, and the plane where the outer wall of the threaded barrel is located is in the same plane as the plane where the outer wall of the first transverse tube is located.

3. The assembled steel structure according to claim 2 is characterized in that: The mechanism for limiting the unidirectional rotation of the threaded tube includes two bevel gear rings slidably arranged in the slide groove, the two bevel gear rings are meshed with each other, a plurality of connecting rods are fixedly connected to the outer ring surface of one of the bevel gear rings, the other end of the connecting rods is fixedly connected to the inner wall of the threaded tube, and a plurality of sliding rods are annularly fixedly connected to the side wall of the other bevel gear ring, the other ends of the plurality of sliding rods pass through the positioning block and are fixedly connected to a cross plate, the sliding rod is slidably connected to the positioning block, a tension spring is sleeved on the sliding rod, and the two ends of the tension spring are respectively fixedly connected to the positioning block and the cross plate, and the inner bottom of the first cross tube The surface is fixedly connected with a connecting shaft, and a push ring is rotatably sleeved on the connecting shaft, one end of the push ring passes through the first through slot and fits with the side wall of the horizontal plate, the first through slot is opened on the side wall of the horizontal plate, and the other end of the push ring is fit with an L-shaped sliding rod, the top end of the L-shaped sliding rod is fixedly connected with a frame, the frame is slidably sleeved on the rotating shaft, one end of the frame is fixedly connected with a second sliding rod, one end of the second sliding rod passes through the first horizontal tube and enters the second through hole, the second sliding rod is slidably connected to the first horizontal tube, and the second through hole is opened on the side wall of the first horizontal tube.

4. The assembled building steel structure according to claim 3 is characterized in that: The cross section of one end of the second sliding rod inserted into the second through hole is an arc surface.

5. The assembled building steel structure according to claim 3 or 4, characterized in that: The positioning mechanism includes a gear ring fixedly sleeved on the rotating shaft, one side end of the gear ring is meshed with an arc-shaped rack, the side wall of the arc-shaped rack is fixedly connected to a first slide bar, the other end of the first slide bar passes through two limit rings and a cross plate in sequence and penetrates into the first through hole and fits with one end of the push rod, the two limit rings are respectively fixed to the first cross tube and the inner wall of the second cross tube and are slidably connected to the first slide bar, the cross plate is slidably connected to the first slide bar, a compression spring is sleeved on the first slide bar, the compression spring is arranged between the two limit rings, the two ends of the compression spring are respectively fitted with the first slide bar and the side wall of the limit ring, and the cross-section of the first slide bar is Z-shaped.

6. The assembled building steel structure according to claim 5 is characterized in that: The arc angle of the arc-shaped rack ranges from 90° to 150°.

7. The assembled building steel structure according to claim 6, characterized in that: The supporting mechanism includes a positioning groove opened on the side wall of the steel section, the positioning groove is communicated with the second dovetail groove, a support rod is hinged in the positioning groove through a pin shaft, the top end of the support rod passes through the second dovetail groove and is inserted into the positioning groove, and the two positioning grooves are respectively opened on the bottom surfaces of the first cross tube and the second cross tube and are inclined.

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