Tree-shaped truss and roof integral assembly process

Abstract

The invention discloses a tree-shaped truss and a roof integral assembly process, and aims to provide a high-precision and high-stability roof assembly method which is particularly suitable for construction of a large steel structure roof and has relatively high engineering efficiency and safety. The overall roof assembling technology comprises the steps of tree-shaped truss assembling, roof grid beam assembling, riding track assembling and purline assembling, tree-shaped trusses are connected through high-strength bolts, joints are fixed through the gas shielded welding technology, and the stability and the bearing capacity of the structure are further enhanced. In addition, the technical means of temporary supporting and hydraulic jack dismantling are further introduced, and safety and supporting stability in the splicing process are effectively guaranteed. Experimental data show that compared with the prior art, the splicing error can be remarkably reduced, the construction precision can be improved, errors and potential safety hazards possibly occurring in the construction process are reduced, and the method has wide application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of structural engineering, and in particular relates to a tree-shaped truss and roof integral assembly process. Background Art

[0002] In traditional building structures, the assembly of roof trusses usually relies on manual operation, which affects the assembly accuracy and construction efficiency, and is prone to errors, which in turn affects the safety of the roof structure. Especially for large and complex truss structures, extremely high precision control is required during the assembly process. In some roof construction, there is still a lack of technical means to strictly control and detect each assembly step, which often leads to problems such as inaccurate docking and structural deformation during the assembly process, thus affecting the overall stability and service life of the building. Therefore, a new roof assembly process is needed that can effectively solve the above problems. Summary of the invention

[0003] In order to solve the above problems, the present invention discloses a tree-like truss and an overall assembly process for a roof, aiming to improve the accuracy and efficiency of the roof truss assembly through innovative design and improved assembly process, and to ensure the stability and safety of the structure during the assembly process. The tree-like truss is composed of an upper chord, a middle chord, a lower chord, a middle upper chord web member, a middle lower chord web member, and a lower chord hyperbolic rod, and adopts a high-precision assembly process so that the error of each splicing point is controlled within a specified range, thereby improving the reliability of the overall structure.

[0004] To achieve the above object, the technical solution of the present invention is as follows: A tree-like truss and roof integral assembly process, comprising an upper chord, a middle chord, a lower chord, a middle upper chord web member, a middle lower chord web member, and a lower chord hyperbolic rod, wherein the upper chord is located at the uppermost part of the tree-like truss and is connected to the middle chord via the middle upper chord web member; the middle chord is located in the middle part of the tree-like truss and is connected to the upper chord via the middle upper chord web member and is connected to the lower chord via the middle lower chord web member; the lower chord is located at the lowermost part of the tree-like truss and is connected to the middle chord via the middle lower chord web member and is connected to a supporting steel column via the lower chord hyperbolic rod.

[0005] As an improvement of the present invention, the upper chord, middle chord, lower chord, middle upper chord web rod, middle lower chord web rod, and lower chord hyperbolic rod are connected by a gas shielded welding process. The welding wire specification used during welding is 1.2mm, the current is set to 180A, the welding speed is 5-7cm / min, and the weld thickness is 6-8mm.

[0006] As an improvement of the present invention, the lower chord hyperbolic rod is in the shape of a hyperbola and is used to connect the lower chord and the supporting steel column. The connecting parts are connected by M20 bolts, and the bolt torque is set to 200N·m.

[0007] The present invention also provides a roof integral assembly process, the specific steps are as follows: S1. Tree truss assembly: The tree truss parts are connected by high-strength bolts. The bolt specification is M24 and the torque value is 300 N·m. The laser rangefinder is used to control the accuracy and the error is within ±2 mm. S2. Single-piece truss assembly: After the tree-like truss assembly is completed, high-strength bolts are used for connection. The bolt specification is M20 and the torque value is 200 N·m. The total station is used for positioning, and the error is within ±1 mm. S3. Roof grid beam assembly: After the single truss is assembled, it is carried out by CO2 gas shielded welding, the welding wire diameter is 1.2 mm, the welding current is 200 A, and the level is used to control the horizontal and vertical degrees, with an error within ±1 mm; S4. Bridleway assembly: This is done after the roof grid beams are assembled. High-strength bolts are used for connection. The bolt specification is M16 and the torque value is 100 N·m. The straightness and verticality are controlled by a theodolite with an error within ±0.5 mm. S5. Purlin assembly: Use self-tapping screws with a screw specification of ST4.8×25. Use a steel ruler and a spirit level to control the spacing and levelness with an error within ±0.5 mm.

[0008] As an improvement of the present invention, the overall roof assembly process also includes setting up temporary supports, setting up temporary supports at the positions of concrete frame beams and columns before assembling the tree-like trusses, using steel pipe supports with a diameter of φ114 mm and a wall thickness of 4 mm, and using diagonal braces for reinforcement.

[0009] As an improvement of the present invention, after the purlins are assembled in step S5, the temporary support is removed, and an automatic hydraulic jack is used to gradually unload the support to ensure smooth removal of the support, with the error controlled within ±0.5 mm.

[0010] As an improvement of the present invention, during the overall assembly of the roof, all connecting bolts are checked using a torque wrench to ensure that the tightening torque of all connection points meets the preset standard, and a structural stability check is performed after each assembly step to ensure that the error is within ±2mm.

[0011] As an improvement of the present invention, in each step of the overall assembly process of the roof, special rulers and precision instruments are used for dimensional control to ensure that the component accuracy meets the preset requirements, and the error ranges are: the tree truss assembly error is ±2mm, the single-piece truss assembly error is ±1mm, the roof grid beam error is ±1mm, the horseway assembly error is ±0.5mm, and the purlin assembly error is ±0.5mm.

[0012] The beneficial effects of the present invention are: (1) The process of the present invention controls the assembly error through high-precision equipment such as laser rangefinders, total stations and levels, ensuring that the connection accuracy of various parts such as tree-like trusses and roof grid beams is within ±1 mm, thereby greatly improving the stability and safety of the roof structure.

[0013] (2) The roof assembly process of the present invention can not only accurately control each step of the assembly, but also support and dismantle the roof through an automatic hydraulic jack, thereby avoiding the manual dismantling process in the traditional process, reducing the complexity and risk of manual operation, and improving construction efficiency.

[0014] (3) The present invention adopts high-strength bolts and gas shielded welding technology when assembling the tree-like trusses to ensure the stability and durability of the connection parts. The tightening torque of each bolt connection point is tested by a torque wrench to ensure that it meets the standard requirements. In addition, by setting steel pipe supports and diagonal braces, the stability of the structure during the assembly process is enhanced, and it is ensured that no unnecessary tilting or deformation occurs during the assembly process, further improving the overall construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 It is a schematic diagram of the connection between the tree-like truss and the supporting steel column of the present invention.

[0017] Figure 3 It is a schematic diagram of the setting of the overall assembly frame of the roof truss of the present invention.

[0018] List of Figure Symbols: 1. Upper chord; 2. Middle chord; 3. Lower chord; 4. Middle upper chord belly rod; 5. Middle lower chord belly rod; 6. Lower chord hyperbolic rod; 7. Supporting steel column; 8. Steel casting. DETAILED DESCRIPTION

[0019] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0020] The specific implementation of the present invention is described by the following examples, each of which is only a partial application of the present invention, and can be selected and adjusted according to different needs in actual applications. In the following, "Example 1" is used as the main example, and the other examples are compared by adjusting certain parameters.

[0021] Example 1 Before assembling the tree-like trusses, temporary steel pipe supports are set up, with a diameter of φ114mm and a wall thickness of 4mm. During dismantling, hydraulic jacks are used to gradually unload to ensure stability during the dismantling process, with the error controlled within ±0.5mm.

[0022] (1) Use high-strength bolts (specification: M24, torque 300 N·m) to connect the various parts of the tree truss, and use a laser rangefinder to control the accuracy, and the error is controlled within ±2 mm.

[0023] (2) Use CO2 gas shielded welding to weld and assemble the roof grid beams. The welding wire specification is 1.2mm, the welding current is 200A, the welding speed is 5-7cm / min, the weld thickness is 6-8mm, and the welding error is controlled within ±1mm.

[0024] (3) Use high-strength bolts (specification: M16, torque 100 N·m) to assemble the bridleway, and use a theodolite to control the straightness and verticality, with the error controlled within ±0.5 mm.

[0025] (4) Use self-tapping screws to connect the purlins. The specification is ST4.8×25. The error is controlled within ±0.5mm. Use a steel ruler and a spirit level to control the spacing and levelness.

[0026] Example 2 Before assembling the tree-like trusses, steel pipes are used for support, with a diameter of φ120mm and a wall thickness of 5mm. Hydraulic jacks are used during dismantling, and the error is controlled within ±0.5mm.

[0027] (1) Use high-strength bolts (specification: M24, torque 350N·m) to connect the various parts of the tree truss, and the error is controlled within ±2mm.

[0028] (2) Use CO2 gas shielded welding to weld and assemble the roof grid beams. The welding wire specification is 1.2mm, the welding current is 220A, the welding speed is 6-8cm / min, the weld thickness is 7-9mm, and the error is controlled within ±1mm.

[0029] (3) Use M18 bolts (torque 120 N·m) to connect and assemble the bridleway, and the error should be controlled within ±0.5 mm.

[0030] (4) Use self-tapping screws to connect the purlins. The specification is ST4.8×25. The error is controlled within ±0.5mm. Use a steel ruler and a spirit level to control the spacing and levelness.

[0031] Example 3 Steel pipes are used for support before the tree-like trusses are assembled. The diameter of the steel pipes is φ114mm and the wall thickness is 4mm. The error during dismantling is controlled within ±0.5mm.

[0032] (1) Use high-strength bolts (specification: M24, torque 320N·m) to connect the various parts of the tree truss, and the error is controlled within ±1.5mm.

[0033] (2) Use CO2 gas shielded welding to assemble the roof grid beams. The welding wire specification is 1.2mm, the welding current is 210A, the welding speed is 6cm / min, the weld thickness is 6mm, and the error is controlled within ±0.8mm.

[0034] (3) Use M16 bolts (torque 100 N·m) to assemble the bridleway, with the error controlled within ±0.5 mm.

[0035] (4) Use self-tapping screws to connect the purlins. The specification is ST4.8×25. The error is controlled within ±0.5mm. Use a steel ruler and a spirit level to control the spacing and levelness.

[0036] Comparative Example 1 Before assembling the tree-like trusses, ordinary steel pipes are used to set up supports. The diameter of the steel pipes is φ100mm and the wall thickness is 3mm. No hydraulic jacks are used during dismantling, and the error is controlled within ±2mm.

[0037] (1) Standard bolts (specification: M24, torque 250 N·m) were used to connect the tree trusses. No laser rangefinder was used, and the error was controlled within ±5 mm.

[0038] (2) Conventional arc welding is used when welding and assembling roof grid beams. The welding wire specification is 1.6 mm, the welding current is 180 A, the welding speed is 4 cm / min, the weld thickness is 5 mm, and the error is controlled within ±2 mm.

[0039] (3) Use M16 bolts (torque 90 N·m) to assemble the bridleway, with the error controlled within ±2 mm.

[0040] (4) Use self-tapping screws to connect the purlins, with specifications of ST4.8×25 and the error controlled within ±0.5mm. By comparing the experimental data, it can be clearly seen that the embodiments of the present invention have significant advantages over the prior art in controlling assembly errors, especially in tree-like truss assembly, welding errors, and temporary support removal, which can significantly improve assembly accuracy and construction safety.

[0041] It should be noted that the drawings only illustrate the technical ideas of the present invention, and the protection scope of the present invention cannot be limited by this shape. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. A tree-like truss, comprising an upper chord (1), a middle chord (2), a lower chord (3), a middle upper chord web member (4), a middle lower chord web member (5), and a lower chord hyperbolic rod (6), characterized in that: The upper chord (1) is located at the uppermost part of the tree-like truss and is connected to the middle chord (2) via a middle upper chord web member (4); the middle chord (2) is located at the middle part of the tree-like truss and is connected to the upper chord (1) via a middle upper chord web member (4), and is connected to the lower chord (3) via a middle lower chord web member (5); the lower chord (3) is located at the lowermost part of the tree-like truss and is connected to the middle chord (2) via a middle lower chord web member (5), and is connected to the supporting steel column (7) via a lower chord hyperbolic rod (6).

2. A tree-like truss according to claim 1, characterized in that: The upper chord (1), the middle chord (2), the lower chord (3), the middle upper chord web rod (4), the middle lower chord web rod (5), and the lower chord hyperbolic rod (6) are connected by a gas shielded welding process. The welding wire used during welding has a specification of 1.2 mm, the current is set to 180 A, the welding speed is 5-7 cm / min, and the weld thickness is 6-8 mm.

3. A tree-like truss according to claim 1, characterized in that: The lower chord hyperbolic rod (6) is in the shape of a hyperbola and is used to connect the lower chord (3) and the supporting steel column (7). The connection parts are connected by M20 bolts, and the bolt torque is set to 200 N·m.

4. A roof integral assembly process, characterized in that: The specific steps are as follows: S1. Tree truss assembly: The tree truss parts are connected by high-strength bolts. The bolt specification is M24 and the torque value is 300 N·m. The laser rangefinder is used to control the accuracy and the error is within ±2 mm. S2. Single-piece truss assembly: After the tree-like truss assembly is completed, high-strength bolts are used for connection. The bolt specification is M20 and the torque value is 200 N·m. The total station is used for positioning, and the error is within ±1 mm. S3. Roof grid beam assembly: After the single truss is assembled, it is carried out by CO2 gas shielded welding, the welding wire diameter is 1.2 mm, the welding current is 200 A, and the level is used to control the horizontal and vertical degrees, with an error within ±1 mm; S4. Bridleway assembly: This is done after the roof grid beams are assembled. High-strength bolts are used for connection. The bolt specification is M16 and the torque value is 100 N·m. The straightness and verticality are controlled by a theodolite with an error within ±0.5 mm. S5. Purlin assembly: Use self-tapping screws with a screw specification of ST4.8×25. Use a steel ruler and a spirit level to control the spacing and levelness with an error within ±0.5 mm.

5. The overall roof assembly process according to claim 4 is characterized in that: The overall assembly process of the roof also includes setting up temporary supports. Temporary supports are set up at the positions of the concrete frame beams and columns before the tree-like trusses are assembled. Steel pipe supports are used. The steel pipe has a diameter of φ114 mm and a wall thickness of 4 mm, and is reinforced with diagonal braces.

6. The overall roof assembly process according to claim 5, characterized in that: After the purlins in step S5 are assembled, the temporary supports are removed. During the removal, automatic hydraulic jacks are used to gradually unload the supports to ensure smooth removal of the supports with an error controlled within ±0.5 mm.

7. The overall roof assembly process according to claim 4, characterized in that: During the overall assembly of the roof, all connecting bolts are tested using a torque wrench to ensure that the tightening torque of all connection points meets the preset standard, and a structural stability check is performed after each assembly step to ensure that the error is within ±2mm.

8. The overall roof assembly process according to claim 4, characterized in that: In each step of the overall assembly process of the roof, special rulers and precision instruments are used for dimensional control to ensure that the component accuracy meets the preset requirements. The error ranges are: tree truss assembly error is ±2mm, single-piece truss assembly error is ±1mm, roof grid beam error is ±1mm, horseway assembly error is ±0.5mm, and purlin assembly error is ±0.5mm.

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