Construction method for segmented connection of large-span roof pipe truss

Abstract

The invention relates to the technical field of building construction, in particular to a construction method for segmented connection of a large-span roof pipe truss. The method comprises the following steps: firstly, reasonably segmenting a pipe truss according to design and transportation conditions, designing and processing a flange plate made of a high-strength steel plate for each segment, accurately cutting, drilling and preprocessing during processing, and simultaneously detecting the quality of dimensional accuracy, aperture, pitch and surface hardness; then the pipe truss and the flange plates are transported to the site, the flange plates are accurately butted, high-strength bolts are used for fastening according to the sequence from the middle to the two sides and the designed torque to complete assembly, and finally inspection and adjustment are conducted to ensure stable connection; according to the method, the flange plates are connected with the high-strength bolts, the problems that traditional welding and splicing are difficult, the working procedure is complex, and the structure is prone to cracking are solved, the construction efficiency and the structural stability are improved, disassembly and recombination are convenient, and the method is suitable for large-span roof pipe truss connection.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a construction method for segmented connection of large-span roof tube trusses. Background Art

[0002] In modern construction, large-span roof tube truss structures are widely used in buildings such as industrial plants, warehouses, and airport terminals. Due to their large size and limited transportation, large-span roof tube trusses are typically manufactured in sections at the factory and then transported to the construction site for assembly. Traditionally, large-span tube truss segmental connection methods rely on on-site welding: the truss is segmented and pre-welded, then transported to the site and welded together to form a complete truss. However, this traditional method has several drawbacks. Firstly, on-site alignment during assembly is challenging, time-consuming, and requires high technical skills from the construction staff. Secondly, the welding process is complex, requiring not only welding and polishing but also flaw detection to ensure weld quality, and subsequent painting for corrosion protection. Furthermore, welds are prone to cracking, compromising the stability and safety of the structure. Furthermore, existing connection methods have limitations regarding disassembly and reassembly, making them difficult to meet the requirements of some scenarios requiring structural flexibility. Therefore, developing an efficient, reliable, and user-friendly method for connecting large-span roof tube trusses segmentally is of great practical significance. Summary of the Invention

[0003] The present invention aims to solve the above problems and thus provides a construction method for segmented connection of large-span roof tube trusses.

[0004] The present invention solves the above problems by adopting the following technical solutions: A construction method for segmented connection of long-span roof tube trusses is carried out in the following steps: Step 1: Segmentation of pipe trusses and design and production of flanges: Based on the design requirements and transportation conditions of the large-span roof pipe trusses, the pipe trusses are rationally segmented. For each segmented pipe truss section, a flange specifically designed for connection is designed. The flange is made of steel plates with sufficient strength to withstand the force of high-strength bolts when connecting the pipe trusses. Step 2: Flange processing: Cut the flange according to the precise size of the pipe truss segment to ensure that its external dimensions meet the design requirements; accurately drill holes on the flange, and the hole spacing and position are strictly in accordance with the design requirements to facilitate the subsequent installation of high-strength bolts; at the same time, pre-treat the flange to remove surface oil and rust to ensure its surface quality; Step 3: Transport to site: Transport each pipe truss part and the processed flange to the construction site separately. Take appropriate protective measures during transportation to prevent damage to the pipe truss and flange. Step 4: On-site assembly: At the construction site, first accurately connect the flange parts of the pipe truss according to the designed position to ensure that the connecting surfaces are tightly fitted; then, use high-strength bolts that can provide sufficient shear and tensile strength to fix the connected flanges together in sequence. When tightening the high-strength bolts, follow the prescribed tightening sequence and torque; Step 5: Check and adjust: After assembly, conduct a comprehensive inspection of the connection parts to check whether the flange joints are flat, whether there are any misalignments, and whether the high-strength bolts are tightened in place. If any problems are found, make adjustments in time to ensure the overall stability of the connected pipe truss structure.

[0005] Furthermore, in step one, when the pipe truss is segmented, the size limitation of the transport vehicle and the lifting capacity of the lifting equipment at the construction site are fully considered to ensure that the segmented pipe truss is easy to transport and install.

[0006] Furthermore, in step 2, the processed flange is subjected to quality inspection, including dimensional accuracy inspection, hole diameter and hole spacing inspection, and surface hardness inspection. Only flanges that pass the inspection can enter the next process.

[0007] Furthermore, in step 4, when tightening the high-strength bolts, a torque wrench is used to tighten them step by step in the order of the middle first and then the two sides, and the tightening torque of each high-strength bolt must meet the requirements of the design specifications.

[0008] Furthermore, a plurality of reinforcing ribs are provided on the periphery of the connection end between the tube truss and the flange.

[0009] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: The present invention greatly simplifies the on-site splicing process of large-span roof tube trusses by adopting flange plates and high-strength bolt connections, reduces the time for alignment, and improves construction efficiency. Compared with traditional welding methods, the present invention avoids the complex processes of welding, grinding, and flaw detection, reduces construction costs, and at the same time reduces the risk of cracking at welding points, thereby improving the stability and safety of the structure. The design of the flange plates makes the tube trusses easy to disassemble and reassemble, can meet the requirements for structural flexibility in different scenarios, and has good versatility and reusability. DETAILED DESCRIPTION

[0010] The present invention will be further described below with reference to the embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0011] A construction method for segmented connection of long-span roof tube trusses is carried out in the following steps: Step 1: Tube truss segmentation and flange design and production: In the factory, the tube truss is rationally segmented based on the design drawings of the large-span roof tube truss, the dimensions of the transport vehicle, the height and width restrictions on the road, and the lifting weight and lifting radius parameters of the lifting equipment on the construction site, such as the tower crane. For example, a roof tube truss with a span of 30 meters is divided into three sections based on actual conditions, each approximately 10 meters long. For each segmented tube truss section, a flange is designed specifically for connection based on its pipe diameter, pipe wall thickness, and the load factors it bears. The flanges are processed using Q345 steel plate, which has excellent strength and toughness and can meet the requirements of withstanding the high-strength bolt forces used when connecting the tube trusses. Step 2. Flange processing: Use a CNC cutting machine to cut the steel plate according to the precise size of the pipe truss segment to ensure that the outer diameter, inner diameter and thickness of the flange are within the error range and meet the design requirements; use high-precision drilling equipment to accurately drill holes on the flange to ensure the spacing and position accuracy of the holes, strictly follow the design requirements, and the error does not exceed the specified value, so that high-strength bolts can be installed smoothly later; after the drilling is completed, the flange is pre-treated with a shot blasting process to remove surface oil and rust impurities, so that the flange surface presents a certain roughness, increase the adhesion of the subsequent anti-corrosion coating, and ensure its surface quality; at the same time, the processed flange is quality inspected, and the dimensional accuracy is measured using a measuring tool. The aperture gauge is used to detect the aperture, the hole distance is measured with a caliper, and the surface hardness is tested with a hardness tester. Only flanges that pass all tests can enter the next process; Step 3: Transport to site: Transport each pipe truss part and the processed flange to the construction site separately. Take appropriate protective measures during transportation to prevent damage to the pipe truss and flange. Step 4: On-site assembly: At the construction site, use lifting equipment to lift the pipe truss part to the vicinity of the installation location; first, arrange professional construction personnel to accurately connect the flange part of the pipe truss according to the designed position, and by pulling control lines and using measuring instruments, ensure that the connecting surfaces are tightly fitted and there are no misalignments on the top and bottom; then, select 10.9 grade high-strength bolts that meet national standards. This grade of high-strength bolts can provide sufficient shear and tensile strength to meet the bearing capacity requirements of the connected pipe truss; use a torque wrench to insert the high-strength bolts into the bolt holes of the flange in sequence, and tighten them gradually in the order of first the middle and then the two sides; during the tightening process, strictly follow the torque value required by the design specifications. For example, for M20 high-strength bolts, the tightening torque is controlled within the specified range, and the torque wrench reading is used for real-time monitoring to ensure that the tightening torque of each high-strength bolt meets the requirements; Step 5: Check and adjust: After assembly, conduct a comprehensive inspection of the connection parts to check whether the flange joints are flat, whether there are any misalignments, and whether the high-strength bolts are tightened in place. If any problems are found, make adjustments in time to ensure the overall stability of the connected pipe truss structure.

[0012] A plurality of reinforcing ribs are arranged on the periphery of the connection end between the pipe truss and the flange.

[0013] The present invention greatly simplifies the on-site splicing process of large-span roof tube trusses by adopting flange plates and high-strength bolt connections, reduces the time for alignment, and improves construction efficiency. Compared with traditional welding methods, the present invention avoids the complex processes of welding, grinding, and flaw detection, reduces construction costs, and at the same time reduces the risk of cracking at welding points, thereby improving the stability and safety of the structure. The design of the flange plates makes the tube trusses easy to disassemble and reassemble, can meet the requirements for structural flexibility in different scenarios, and has good versatility and reusability.

[0014] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made using the contents of the present invention specification are included in the scope of the present invention.

Claims

1. A construction method for segmented connection of long-span roof tube trusses, characterized in that: Follow these steps: Step 1: Segmentation of pipe trusses and design and production of flanges: Based on the design requirements and transportation conditions of the large-span roof pipe trusses, the pipe trusses are reasonably segmented; for each segmented pipe truss section, a flange specifically designed for connection is designed; The flange is made of steel plate with sufficient strength to withstand the force of high-strength bolts when connecting the pipe truss; Step 2: Flange processing: Cut the flange according to the precise size of the pipe truss segment to ensure that its external dimensions meet the design requirements; accurately drill holes on the flange, and the hole spacing and position are strictly in accordance with the design requirements to facilitate the subsequent installation of high-strength bolts; at the same time, pre-treat the flange to remove surface oil and rust to ensure its surface quality; Step 3: Transport to site: Transport each pipe truss part and the processed flange to the construction site separately. Take appropriate protective measures during transportation to prevent damage to the pipe truss and flange; Step 4: On-site assembly: At the construction site, first accurately connect the flange parts of the pipe truss according to the designed position to ensure that the connecting surfaces are tightly fitted; then, use high-strength bolts that can provide sufficient shear and tensile strength to fix the connected flanges together in sequence. When tightening the high-strength bolts, follow the prescribed tightening sequence and torque; Step 5: Check and adjust: After assembly, conduct a comprehensive inspection of the connection parts to check whether the flange joints are flat, whether there are any misalignments, and whether the high-strength bolts are tightened in place. If any problems are found, make adjustments in time to ensure the overall stability of the connected pipe truss structure.

2. The construction method for segmented connection of large-span roof tube trusses according to claim 1 is characterized in that: In step 1, when dividing the pipe truss into sections, the size limitations of the transport vehicle and the lifting capacity of the lifting equipment at the construction site are fully considered to ensure that the segmented pipe truss is easy to transport and install.

3. The construction method for segmented connection of large-span roof tube trusses according to claim 1 is characterized in that: In step 2, the processed flange is subjected to quality inspection, including dimensional accuracy inspection, hole diameter and hole spacing inspection, and surface hardness inspection. Only flanges that pass the inspection can enter the next process.

4. The construction method for segmented connection of large-span roof tube trusses according to claim 1 is characterized in that: In step 4, when tightening the high-strength bolts, use a torque wrench to tighten them gradually in the order of the middle first and then the two sides. The tightening torque of each high-strength bolt must meet the design specification requirements.

5. The construction method for segmented connection of large-span roof tube trusses according to claim 1 is characterized in that: A plurality of reinforcing ribs are arranged on the periphery of the connection end between the pipe truss and the flange.