Another Scientific And Technological Achievement Reaches The International Leading Level

Another scientific and technological achievement reaches the international leading level

In steel structure engineering, how can welding and riveting be interspersed to ensure strength and reduce costs? Two recent scientific and technological achievements provide the answer. They have both reached the international advanced level, and one of them has reached the international leading level, directly solving the actual pain points in the construction process of long-span buildings and bridges.

Ropeless dome structure breaks through traditional limitations

The Ouhai District Olympic Sports Center project has become a test site for the application of new technologies. The new cable-less multi-directional tensioning dome structure system developed by the R&D team makes the long-span space structure lighter. Compared with the traditional cable structure, the new system saves 33% of the cable usage, reduces the number of anchors by approximately 73%, and significantly reduces material and processing costs.

The method of graded installation and lifting and zoned and graded tensioning used during construction ensures accuracy. This structure not only has a novel appearance, but also has stronger reliability. In order to monitor construction safety, the team also built an Internet of Things remote wireless intelligent monitoring system, which can grasp the structural status in real time.

Universal hinge head node realizes multi-directional rotation

Traditional nodes, when dealing with bias cables . The mixed application of welding and riveting in modern steel structure engineering. The mixed application of welding and riveting in modern steel structure engineering is another scientific and technological achievement that has reached the international leading level and is easily restricted. The newly invented universal hinge head of the bias cable stay connects the node and the cable clamp node, allowing the upper and lower ends of the stay to rotate in multiple directions. This design solves the problem of connection under complex stress conditions, and also makes the ring-free cable structure possible in practical applications.

In practical applications, the construction of ring-free prestressed cable support structures is carried out in the gymnasium, which is the first of its kind in China. During the installation, workers discovered that this node design greatly simplified the operation process of the mixed application of welding and riveting in modern steel structure engineering , reducing the trouble of repeated adjustments required by traditional welding or riveting, and significantly improving construction efficiency.

New technology for stainless steel composite steel plate bridge welding

During the construction work of the double-decker viaduct of the public railway, the cutting and welding of stainless steel and bridge steel composite steel plates once became a considerable problem. Relying on the support provided by the Shanghai-Hangzhou-Ningbo reconstruction project, the relevant team has gone through research and development, thus possessing plasma and laser cutting processes. And by cooperating with robot welding, production efficiency has been significantly improved. When the workers performed the actual operation, they noticed that the cutting edges became neater and the welding quality became more stable.

For the welding between the bridge slab and the U-rib, the team created a new full-penetration welding process that has never been used before. First, 1.6 mm welding wire was used for submerged arc single-pass internal welding, and then 3.2 mm welding wire was used for single-pass external welding without grooves, thus achieving high-efficiency and high-quality manufacturing results. The process used in this process simplifies the cutting process during the implementation process. In addition, in the past, the traditional welding operation process required a series of multiple trimming steps, so that the overall construction period can be shortened by approximately 20%.

Hybrid support system enables rapid construction

The steel bridge structure is located on the lower track and is combined with the temporary support structure to form a hybrid support system. This is the key to the rapid construction of the double-decker steel bridge for public rail. During construction, the temporary supports functioned together with the permanent structure, avoiding the complicated situation of repeatedly dismantling and installing brackets in the traditional method. Data presented at the Shanghai-Hangzhou-Ningbo project site show that such a system has reduced the bridge construction cycle by 30%.

When welding and riveting are applied to hybrid bearing systems, each performs its own duties. For key stress-bearing parts, full penetration welding is used to ensure that the strength is achieved. If the connection point is not critical, riveting is used to increase the installation speed. Such a combination makes the overall structure both strong and economical, and workers reported that it was indeed smoother during operation.

Intelligent robot welding improves automation level

In the field of building steel structures, welding of fillet welds used to be performed manually, but its quality was unstable. The welding model system software developed by the team cooperates with camera visual recognition and three-dimensional model digital processing technology to achieve automatic and rapid positioning of multiple components. The robot can automatically generate welding paths according to the program, thereby reducing manual intervention.

This technology has greatly improved the degree of welding automation. The Achievement Evaluation Committee feels that it has played a very good role as an example. During the actual workshop test, the welding efficiency of the robot was as much as three times higher than that of manual welding, the welding qualification rate increased from 85% to 98%, and the waste of welding materials was significantly reduced.

Remarkable economic benefits and construction practicability

Reducing costs and improving reliability are the core values ​​of the two technologies. Compared with traditional solutions, the long-span ringless cable structure saves 38% of the cable usage, which means that direct material expenses are greatly reduced, the number of anchors is reduced by 73%, and the installation difficulty and subsequent maintenance costs are also reduced. The economic benefits are very significant.

The practical double-layer bridge construction technology for public rail, the stainless steel composite steel plate welding process effectively reduces the chance of rework, and the hybrid support system significantly shortens the project period. According to calculations by the project party, the overall construction cost will be reduced by approximately 15%, and the expected life span of the structure will be extended by more than 10 years.

After you have seen these breakthroughs, do you think that the mixed use of welding and riveting will become mainstream in large-scale engineering projects in the future? Feel free to share your views in the comment area, like it and forward it to let more people know about this technology!