Abstract:In response to the problem of poor seismic performance of existing brick masonry buildings in urban areas, a new seismic reinforcement technology suitable for multi-layer brick masonry buildings is proposed, which uses vertical unbonded prestressed steel bars to reinforce the masonry walls, thereby improving the seismic performance of the walls and enhancing the overall seismic capacity of the buildings. In order to understand the reinforcement effect of this technology, two batches of 17 wall components were subjected to pseudo static test research, and a two story full scale house model was subjected to pseudo dynamic test research. The experimental research results of wall components indicate that this reinforcement technology can significantly improve the crack resistance, shear bearing capacity, and ductility of brick masonry walls. The pseudo dynamic experimental study of the building model further indicates that after using this technology for reinforcement, buildings with seismic fortification intensity less than 8 degrees remain elastic under the pseudo dynamic action of simulating rare 9 degree earthquakes, and their seismic resistance is significantly improved. On the basis of experimental research, a calculation method for the shear bearing capacity of prestressed reinforced masonry walls was proposed. The actual application of this technology in a multi-storey office building in Huairou District of Beijing shows that it has the advantages of simple construction technology, short construction period and low cost

Abstract:The active reflector of the FAST project at the National Astronomical Observatory adopts a large cable structure, which is mainly composed of 6670 cables, 2225 nodes, and 2225 lower cables. Due to the constraints of complex terrain, the installation of the active reflective surface cable network in this project adopts a construction cableway that can continuously move with the installation of the cable network. The upper end of the construction cableway is anchored on the ring beam mobile trolley, and the lower end is anchored on the ring cable suspension leg. During the construction period, the load acting on the support legs of the circumferential cable crane by the construction cableway is relatively large, and a large number of construction personnel are working on the construction cableway. The stability of the support legs of the circumferential cable crane is crucial, while also considering minimizing the impact range of cross operations. Therefore, this article focuses on the design and calculation analysis of the lower ring cable suspension support leg of the construction cableway

Abstract:Through the prestressed construction of cast-in-place beams for the Longwan Dongtou Port Dredging Highway Project of the 77 Provincial Highway Extension Line, this paper summarizes and summarizes the prestressed intelligent construction technology. Practice has proven that the prestressed intelligent construction has significant advantages over traditional prestressed construction methods, not only improving the work efficiency of operators, but also effectively improving construction quality, truly achieving the combination of efficient construction and perfect quality

Abstract:Anchor rods are an important reinforcement and support method in geotechnical engineering. After the anchor rod is fixed, it will generate pre-stress. But when the rock mass structure changes, the prestressed force of the anchor rod will change. This article develops a wireless intelligent anchor rod, which is applied to the reinforcement and support of tunnel rock mass. The principle and structure of intelligent anchor rods were elaborated in detail, and the actual product was applied to a large tunnel. The results show that the intelligent anchor rod has a good effect, not only strengthening the rock mass, but also monitoring the health status of tunnel rock mass in real-time

Abstract:The hydraulic system is the most core component of a cable mounted crane that combines traction and roller walking. This article analyzes the main functions of the cable mounted crane and studies the hydraulic system that meets the various performance indicators of the cable mounted crane. Through in-depth research on hydraulic principles, actuator configuration, component selection, etc., the cable mounted crane can achieve the functions of walking on the cable and positioning lifting. The research results indicate that the maximum walking speed on the cable can reach over 35m/h, the maximum lifting speed can reach over 30m/h, and the precise positioning function can be achieved

Abstract:In many geotechnical engineering projects, it is necessary to use grout stoppers to fully exert the anchoring effect of anchor cables (including anchor rods) in different soil masses and usage environments. In different types of geotechnical anchoring projects, the structural forms of grout stoppers vary depending on their specific functions. This article systematically elaborates on the structure and function of grout stoppers by analyzing their roles in different geotechnical anchor cables

Abstract:In this paper, a Lamb wave baseline free damage identification method based on beamforming is proposed. This method uses the distributed sensor network of the excitation echo mode and the time Window function function to extract the damage signal, and then uses the beamforming algorithm to locate and image the structure damage. The method was validated through numerical simulation and experiments, and the results showed that the proposed method can effectively identify damage

Abstract:Although prestressed technology has only been applied in practical engineering in China for over half a century, it has been widely used and the number of applications is increasing due to its advantages such as structural safety and reliability, material saving, small self weight, good crack resistance of components, and high stiffness. This paper briefly describes the patent Document retrieval work of the prestressed industry, analyzes the overall trend of patent applications, patent category composition, trend comparison and other information, and provides data support for the development and innovation of the prestressed industry and patent strategy analysis