Assembly structure of steel pipe truss and assembly type connecting method

Abstract

The invention relates to an assembly structure of a steel pipe truss and an assembly type connecting method.The assembly structure comprises a prefabricated steel pipe truss upper section, a prefabricated steel pipe truss lower section, diagonal web members and connectors, welding of the steel pipe truss upper section and an upper section connecting pipe is completed in a factory, and welding of the steel pipe truss lower section and a lower section connecting pipe is completed in the factory; inner wall threads are arranged at the connecting ends of the upper-section connecting pipe and the lower-section connecting pipe, outer wall threads are arranged at the connecting pipes at the two ends of the connector, and during construction site assembly, the connecting ends of the upper-section connecting pipe and the lower-section connecting pipe are connected with the connecting pipes of the connector through the threads. Inclined rod connecting plates and end sealing plates are welded to the two ends of inclined web plates prefabricated in a factory, steel pipe connecting plates are also welded to the outer walls of the upper section and the lower section of the steel pipe truss in the factory, and when the inclined web plates are assembled on the construction site, the inclined rod connecting plates and the steel pipe connecting plates are jointly clamped through the two additional connecting plates; and the diagonal web members are connected with the steel pipe truss through bolts. Welding operation is not needed on site, and assembling is fast.

Description

Technical Field

[0001] This invention relates to the assembly and construction of steel pipe trusses, and is applicable to the assembly of steel pipe truss towers, steel pipe truss columns, and roof steel pipe trusses. Specifically, it refers to an assembly structure and assembly connection method for steel pipe trusses. Background Technology

[0002] Many existing wind turbine towers employ a steel pipe truss tower structure design. These towers typically have prefabricated sections of the tower column and diagonal bracing in a factory. After being transported to the construction site, the upper and lower tower column sections are welded together first, and then the ends of the diagonal bracing are welded to the upper and lower tower column sections respectively. Similar situations exist with steel pipe truss columns and roof steel pipe trusses, which, due to their overall length, need to be transported to the site in sections for installation. The existing butt-welded connection method brings many inconveniences to on-site construction: (1) On-site welding is slow and the welding quality is difficult to guarantee; (2) On-site welding operations have high environmental requirements, and some areas prohibit open flame operations due to fire prevention requirements; (3) The steel pipe truss components have been treated with anti-corrosion coating at the factory to meet the anti-corrosion requirements. On-site welding will damage the anti-corrosion coating. Summary of the Invention

[0003] This invention first discloses an assembly structure for a steel pipe truss that eliminates the need for on-site welding, ensuring connection stability and strength while improving assembly efficiency.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An assembly structure for a steel pipe truss includes an upper section of the steel pipe truss, an upper connecting pipe, a lower section of the steel pipe truss, a lower connecting pipe, a connector, and diagonal web members. Both the upper and lower sections of the steel pipe truss include steel pipes. The steel pipes of the upper section are coaxially welded to the upper connecting pipe, and the steel pipes of the lower section are coaxially welded to the lower connecting pipe. The connector includes a circular steel plate located in the middle and connecting pipes located on both sides of the circular steel plate. The connecting pipes are perpendicularly connected to the circular steel plate. The outer walls of the connecting pipes on both sides of the circular steel plate are provided with external threads, and the inner walls of the upper and lower connecting pipes are provided with internal threads. The upper and lower connecting pipes are respectively threaded to the corresponding connecting pipes on the connector. The diagonal brace includes a diagonal member, with a diagonal member connecting plate and an end cap plate at both ends. The diagonal member connecting plate is inserted into the diagonal member along its axial direction. The inserted part of the diagonal member connecting plate is welded to the diagonal member, while the other part of the diagonal member connecting plate is exposed with bolt holes. The ends of the diagonal member are provided with end cap plates on both sides of the diagonal member connecting plate. The end cap plates cover the open end of the diagonal member and are perpendicular to the diagonal member connecting plate. The end cap plates are welded and fixed to the diagonal member connecting plate and the diagonal member respectively. Steel pipe connecting plates are welded to the outer walls of the upper and lower sections of the steel pipe truss. Bolt holes are made on the steel pipe connecting plates. Diagonal braces are inclinedly set between the upper and lower sections of the steel pipe truss. An additional connecting plate is set on each side of the steel pipe connecting plate and the diagonal brace connecting plate. Bolt holes are made on the additional connecting plates so that the two additional connecting plates together clamp the steel pipe connecting plate and the diagonal brace connecting plate. The additional connecting plates, steel pipe connecting plates, and diagonal brace connecting plates are fixed together with bolts.

[0005] Furthermore, the threads on the outer walls of the connecting pipes on both sides of the round steel plate have opposite directions of rotation.

[0006] Furthermore, the wall thickness of the inner threaded section of the upper connecting pipe is not less than the wall thickness of the steel pipe joint end of the upper section of the steel pipe truss, and the wall thickness of the inner threaded section of the lower connecting pipe is not less than the wall thickness of the steel pipe joint end of the lower section of the steel pipe truss. The steel pipe joint end of the upper connecting pipe is provided with a wall thickness transition zone, and the steel pipe joint end of the lower connecting pipe is also provided with a wall thickness transition zone. The wall thickness transition zone gradually thickens from the steel pipe joint end towards the inner threaded direction.

[0007] Furthermore, let the outer diameter of the steel pipe be D, the length of the upper connecting pipe and the lower connecting pipe be no less than 1.5D, the inner wall thread length of the upper connecting pipe and the lower connecting pipe, and the outer wall thread length of the connecting pipe, all need to meet the requirements of no less than 0.5D and no less than 100mm.

[0008] Furthermore, the wall thickness of the connecting pipe is equal to the wall thickness of the inner wall threaded section on the upper and lower connecting pipes. Let the inner diameter of the connecting pipe be d, the wall thickness of the connecting pipe be b, and the depth of the outer wall thread on the connecting pipe be L, satisfying the condition D=d+2b-L.

[0009] Furthermore, the diameter of the round steel plate is greater than the outer diameter of the connecting pipe, and the diameter of the round steel plate is not less than the outer diameter of the upper and lower connecting pipe sections.

[0010] The present invention also discloses a prefabricated connection method for the above-mentioned steel pipe truss, comprising the following steps: Step 1): Prefabricate and assemble the upper and lower sections of the steel pipe truss in the factory, and weld steel pipe connecting plates onto the upper and lower sections of the steel pipe truss respectively; prefabricate the upper and lower connecting pipes in the factory, and weld the upper and lower connecting pipes to the upper and lower sections of the steel pipe truss; assemble the diagonal braces, diagonal brace connecting plates, and end caps in the factory to form prefabricated diagonal web members; prefabricate the external connecting plates and connectors in the factory. Step 2): Transport the prefabricated components to the construction site; Step 3): First, apply structural adhesive to the outer thread of the connector and the inner thread of the upper and lower connecting pipe sections. Then, rotate the connector to connect the connecting pipes on both sides of the connector to the threads of the upper and lower connecting pipe sections respectively. Step 4): Set the diagonal bracing at an angle between the upper and lower sections of the steel pipe truss, and align the diagonal bracing connecting plate at each end of the diagonal bracing with the corresponding steel pipe connecting plate on the side. Then, set an additional connecting plate on each side of the diagonal bracing connecting plate and the steel pipe connecting plate at each end, and fix the two additional connecting plates, the diagonal bracing connecting plate, and the steel pipe connecting plate together with bolts.

[0011] All components used in this invention can be prefabricated in the factory, and some components can be welded. The segmented steel pipe truss and the components assembled on site are transported to the construction site. The segmented steel pipe truss is connected by threads, and the diagonal web members are connected to the steel pipe truss by bolts. No welding work is required on the construction site, and the assembly speed is greatly improved. The assembly method is simple, the requirements for operators are not high, and the construction cost can be reduced. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the assembly nodes of the steel pipe truss tower in the embodiment; Figure 2 for Figure 1 Schematic diagram of the steel pipe connection structure at the connection node of the central tower column; Figure 3 for Figure 2 Exploded view; Figure 4 This is a schematic diagram of the diagonal web member in the embodiment; Figure 5 for Figure 4 Sectional view of AA; Figure 6 for Figure 1 Schematic diagram of the structure at the installation node of the diagonal web member; Figure 7 for Figure 6 Sectional view at point aa.

[0013] Figure label: 1. Upper section of tower column; 2. Lower section of tower column; 3. Diagonal web member; 31. Diagonal member; 32. Diagonal member connecting plate; 33. End sealing plate; 4. Upper section connecting pipe; 5. Lower section connecting pipe; 6. Connector; 61. Round steel plate; 62. Connecting pipe; 63. Round stiffening plate; 7. Inner wall thread; 8. Outer wall thread; 9. Tower column steel pipe; 91. Steel pipe connecting plate; 92. External connecting plate. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0015] This invention discloses an assembly structure for a steel pipe truss. Here, "steel pipe truss" refers to any one of a steel pipe truss tower, steel pipe truss column, or roof steel pipe truss. For any steel pipe truss structure employing a segmented design, the splicing between its segments can utilize the assembly structure scheme disclosed in this invention. This embodiment will only illustrate the assembly structure of a steel pipe truss tower as an example. Figures 1 to 7 As shown, the steel pipe truss tower is assembled from several tower column steel pipes 9 and diagonal web members. For ease of transportation, the tower columns are usually divided into multiple sections and prefabricated in the factory. These sections are then transported to the construction site and assembled. Therefore, as... Figure 1 As shown, the on-site assembly of the steel pipe truss tower mainly involves the connection between the upper and lower tower columns, namely the "tower column connection node", and also the connection between the diagonal web member 3 and the tower column, namely the "diagonal web member installation node".

[0016] In this embodiment, based on the components involved in the two nodes mentioned above, the structure is divided into an upper section 1, a lower section 2, and a diagonal brace 3. Among these, the relevant components used to assemble the "tower column connection node" include, for example... Figure 2 and Figure 3 As shown, the structure includes an upper section 1 of the tower column, an upper connecting pipe 4, a lower section 2 of the tower column, a lower connecting pipe 5, and a connector 6. The connection between the upper and lower sections of the tower column is actually the connection between the tower column steel pipes 9 of the upper and lower sections. In this embodiment, both the upper connecting pipe 4 and the lower connecting pipe 5 are steel pipes with the same outer diameter as the tower column steel pipe 9, and their structures are identical. In the factory, the inner walls of the upper connecting pipe 4 and the lower connecting pipe 5 are pre-machined with internal threads 7. The upper section 1 of the tower column is coaxially welded to the end of the upper connecting pipe 4 without internal threads 7 in the factory, and the lower section 2 of the tower column is coaxially welded to the end of the lower connecting pipe 5 without internal threads 7 in the factory.

[0017] In this embodiment, the connector 6 includes a round steel plate 61, with connecting pipes 62 on both sides of the round steel plate 61. The outer diameter of the connecting pipes 62 is smaller than the outer diameter of the upper and lower connecting pipes. External threads 8 are pre-machined on the circumferential outer wall of the connecting pipes 62, and these external threads 8 and internal threads 7 can mesh with each other. In this embodiment, the external threads 8 on the connecting pipes 62 on both sides of the round steel plate 61 have opposite directions of rotation to ensure that when the connector 6 is rotated, the upper and lower sections of the tower column can be tightened simultaneously using the connector 6. To strengthen the connection strength between the connecting pipes 62 and the upper and lower connecting pipes, circular stiffening plates 63 are also provided inside the connecting pipes 62 near the connection ends. The edges of the circular stiffening plates 63 are welded and fixed along the circumferential inner wall of the connecting pipes 62. In this embodiment, the outer diameter of the round steel plate 61 is larger than the outer diameter of the connecting pipes 62, and the outer diameter of the round steel plate 61 is not smaller than the outer diameter of the upper and lower connecting pipes, facilitating quick alignment when the connector 6 is screwed onto the upper and lower connecting pipes. During on-site assembly, insert the connecting pipe 62 at one end of connector 6 into the upper connecting pipe 4, and insert the connecting pipe 62 at the other end of connector 6 into the lower connecting pipe 5. Rotate connector 6, and the upper and lower tower column sections will gradually move closer together until the outer wall thread 8 is fully screwed into the upper and lower connecting pipe sections. At this point, the assembly of the tower column connection node is complete. To further enhance the stability of the connection between connector 6 and the upper and lower connecting pipe sections, structural adhesive can be applied to the surfaces of the outer wall thread 8 and the inner wall thread 7 before connection.

[0018] To meet the aforementioned mechanical performance requirements of the tower column connection nodes, the dimensional requirements for the involved components are as follows: Let the outer diameter of the tower column steel pipe 9 be D. The effective wall thickness at the inner thread 7 of the upper and lower connecting pipe sections shall not be less than the wall thickness of the upper tower column steel pipe 9 in the upper and lower sections. Therefore, if... Figure 3 As shown, the connection end between the upper connecting pipe 4 and the upper section 1 of the tower column is provided with a wall thickness transition zone. Similarly, the connection end between the lower connecting pipe 5 and the lower section 2 of the tower column is also provided with a wall thickness transition zone. The wall thickness transition zone gradually thickens from the connection end of the tower column steel pipe 9 towards the inner wall thread 7. The length of the upper connecting pipe 4 and the lower connecting pipe 5 are both not less than 1.5D, and meet the requirements of thread length and wall thickness transition zone length. The length of the inner wall thread 7 of the upper connecting pipe 4 and the lower connecting pipe 5, as well as the length of the outer wall thread 8 on the connecting pipe 62, must both be not less than 0.5D and not less than 100mm. In this embodiment, the wall thickness of the connecting pipes 62 on both sides is equal to the wall thickness of the section where the inner wall thread 7 is located on the upper and lower connecting pipes, respectively. Let the inner diameter of the connecting pipe 62 be d, the wall thickness of the connecting pipe 62 be b (including thread depth), and the depth of the inner wall thread 7 on the upper and lower connecting pipes and the depth of the outer wall thread on the connecting pipe 62 be L, satisfying the condition D=d+2b-L.

[0019] The "diagonal brace installation node" mentioned in this embodiment, such as Figures 4 to 7As shown, the components involved include a pre-assembled diagonal web member 3, an external connecting plate 92, and a steel pipe connecting plate 91. The structure of the diagonal web member 3 is as follows: Figure 4 and Figure 5 As shown, the structure includes a diagonal rod 31, a diagonal rod connecting plate 32, and an end cap 33. The diagonal rod 31 is a round steel pipe. Both ends of the diagonal rod 31 are cut open, and a diagonal rod connecting plate 32 is inserted axially into each end. The inserted end of the diagonal rod connecting plate 32 is welded to the diagonal rod 31 as a whole. The other end of the diagonal rod connecting plate 32 is exposed, and a bolt hole is opened at the exposed end. End caps 33 are respectively set on both sides of the diagonal rod connecting plate 32 at both ends of the diagonal rod 31. The end caps 33 are perpendicular to the diagonal rod connecting plate 32, so that the end caps 33 completely cover the open end of the diagonal rod 31. The end caps 33 are welded to the diagonal rod connecting plate 32 and the diagonal rod 31 as a whole. Bolt holes are pre-drilled on the external connecting plate 92 and the steel pipe connecting plate 91 in the factory. The steel pipe connecting plate 91 is pre-welded to the outer wall of the tower column steel pipe 9 at the location where the diagonal web member 3 needs to be connected on the upper section 1 and lower section 2 of the tower column. During on-site assembly of the "diagonal brace installation node", the diagonal brace 3 is inclinedly set between the connection point of the upper section 1 and the lower section 2 of the tower column. Two external connecting plates 92 are set parallel to each end of the diagonal brace 3, so that the two external connecting plates 92 together clamp the steel pipe connecting plate 91 and the diagonal brace connecting plate 32. Then, bolts are used to pass through the corresponding bolt holes to fix the external connecting plate 92, the steel pipe connecting plate 91, and the diagonal brace connecting plate 32 together.

[0020] In this embodiment, the assembly structure of the steel pipe truss tower described above is completed in the factory for all welding operations. No welding work is required on the assembly site. The tower column connection nodes are connected by threads, and the diagonal web member installation nodes are connected by bolts, which makes the assembly process convenient and quick. Compared with the welding method in the prior art, it significantly improves the construction efficiency.

[0021] The prefabricated connection method for the above-mentioned steel pipe truss tower can be carried out according to the following steps: Step 1): In the factory, the prefabrication and assembly of the upper section 1 and the lower section 2 of the tower column are completed, and steel pipe connecting plates 91 are welded onto the upper section 1 and the lower section 2 of the tower column respectively; the prefabrication of the upper section connecting pipe 4 and the lower section connecting pipe 5 is completed in the factory, and the welding of the upper and lower section connecting pipes to the upper and lower sections of the tower column is completed; the assembly and welding of the diagonal brace 31, the diagonal brace connecting plate 32 and the end sealing plate 33 are completed in the factory to form the prefabricated diagonal web member 3; the prefabrication of the external connecting plate 92 and the connector 6 is completed in the factory. Step 2): Transport the prefabricated components to the construction site; Step 3): First, apply structural adhesive to the outer thread 8 of the connector 6 and the inner thread 7 of the upper and lower connecting pipes respectively. Then, rotate the connector 6 so that the connecting pipes 62 on both sides of the connector 6 are threadedly connected to the upper and lower connecting pipes respectively, thereby completing the installation of the tower column connection node. Step 4): Set the diagonal brace 3 at an angle between the connection point of the upper section 1 and the lower section 2 of the tower column, and make the diagonal brace connecting plate 32 at each end of the diagonal brace 3 correspond to the steel pipe connecting plate 91 on the corresponding side. Then, set an additional connecting plate 92 on each side of the diagonal brace connecting plate 32 and the steel pipe connecting plate 91 at each end, and fix the two additional connecting plates 92, the diagonal brace connecting plate 32 and the steel pipe connecting plate 91 together with bolts.

[0022] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An assembly structure for a steel pipe truss, characterized in that: It includes an upper section of steel pipe truss, an upper connecting pipe, a lower section of steel pipe truss, a lower connecting pipe, a connector, and diagonal web members. Both the upper and lower sections of the steel pipe truss consist of steel pipes. The steel pipes of the upper section are coaxially welded to the upper connecting pipe, and the steel pipes of the lower section are coaxially welded to the lower connecting pipe. The connector includes a circular steel plate in the middle and connecting pipes on both sides of the circular steel plate. The connecting pipes are perpendicularly connected to the circular steel plate. The outer walls of the connecting pipes on both sides of the circular steel plate are provided with external threads. The inner walls of the upper and lower connecting pipes are provided with internal threads. The upper and lower connecting pipes are respectively connected to the corresponding connecting pipe threads on the connector. The diagonal brace includes a diagonal member, with a diagonal member connecting plate and an end cap plate at both ends. The diagonal member connecting plate is inserted into the diagonal member along its axial direction. The inserted part of the diagonal member connecting plate is welded to the diagonal member, while the other part of the diagonal member connecting plate is exposed with bolt holes. The ends of the diagonal member are provided with end cap plates on both sides of the diagonal member connecting plate. The end cap plates cover the open end of the diagonal member and are perpendicular to the diagonal member connecting plate. The end cap plates are welded and fixed to the diagonal member connecting plate and the diagonal member respectively. Steel pipe connecting plates are welded to the outer walls of the upper and lower sections of the steel pipe truss. Bolt holes are made on the steel pipe connecting plates. Diagonal braces are inclinedly set between the upper and lower sections of the steel pipe truss. An additional connecting plate is set on each side of the steel pipe connecting plate and the diagonal brace connecting plate. Bolt holes are made on the additional connecting plates so that the two additional connecting plates together clamp the steel pipe connecting plate and the diagonal brace connecting plate. The additional connecting plates, steel pipe connecting plates, and diagonal brace connecting plates are fixed together with bolts.

2. The assembly structure of a steel pipe truss according to claim 1, characterized in that: The threads on the outer walls of the connecting pipes on both sides of the round steel plate have opposite directions of rotation.

3. The assembly structure of a steel pipe truss according to claim 1, characterized in that: The wall thickness of the inner threaded section of the upper connecting pipe is not less than the wall thickness of the steel pipe of the upper section of the steel pipe truss, and the wall thickness of the inner threaded section of the lower connecting pipe is not less than the wall thickness of the steel pipe of the lower section of the steel pipe truss. The steel pipe connection end of the upper connecting pipe is provided with a wall thickness transition zone, and the steel pipe connection end of the lower connecting pipe is also provided with a wall thickness transition zone. The wall thickness transition zone gradually thickens from the steel pipe connection end towards the inner threaded direction.

4. The assembly structure of a steel pipe truss according to claim 1, characterized in that: Let the outer diameter of the steel pipe be D. The length of the upper connecting pipe and the lower connecting pipe shall not be less than 1.5D. The inner wall thread length of the upper connecting pipe and the lower connecting pipe, as well as the outer wall thread length of the connecting pipe, shall not be less than 0.5D and not less than 100mm.

5. The assembly structure of a steel pipe truss according to claim 4, characterized in that: The wall thickness of the connecting pipe is equal to the wall thickness of the inner wall threaded section on the upper and lower connecting pipes. Let the inner diameter of the connecting pipe be d, the wall thickness of the connecting pipe be b, and the depth of the outer wall thread on the connecting pipe be L, satisfying the condition D=d+2b-L.

6. The assembly structure of a steel pipe truss according to claim 1, characterized in that: The diameter of the round steel plate is greater than the outer diameter of the connecting pipe, and the diameter of the round steel plate is not less than the outer diameter of the upper and lower connecting pipe sections.

7. The prefabricated connection method for the steel pipe truss assembly structure as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1): The prefabrication and assembly of the upper and lower sections of the steel pipe truss are completed in the factory, and steel pipe connecting plates are welded onto the upper and lower sections of the steel pipe truss respectively. The prefabrication of the upper and lower connecting pipes is completed in the factory, and the welding of the upper and lower connecting pipes to the upper and lower sections of the steel pipe truss is also completed. The assembly of the diagonal braces, diagonal brace connecting plates, and end caps is completed in the factory to form the prefabricated diagonal web members. The prefabrication of the external connecting plates and connectors is also completed in the factory. Step 2): Transport the prefabricated components to the construction site; Step 3): First, apply structural adhesive to the outer thread of the connector and the inner thread of the upper and lower connecting pipe sections. Then, rotate the connector to connect the connecting pipes on both sides of the connector to the threads of the upper and lower connecting pipe sections respectively. Step 4): Set the diagonal bracing at an angle between the upper and lower sections of the steel pipe truss, and align the diagonal bracing connecting plate at each end of the diagonal bracing with the corresponding steel pipe connecting plate on the side. Then, set an additional connecting plate on each side of the diagonal bracing connecting plate and the steel pipe connecting plate at each end, and fix the two additional connecting plates, the diagonal bracing connecting plate, and the steel pipe connecting plate together with bolts.

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