Abstract:In the noise reduction system of high-speed railway, concrete sound barrier is becoming more and more popular because of its good noise reduction effect, low cost and convenient construction. The selection of shell material and structural design are the key to making high strength lightweight concrete acoustic barrier unit plate. In order to improve the bending strength of the sound barrier unit plate of high-speed railway in typhoon area, the shell material is made of steel fiber high performance concrete. Through calculation, test and construction factors, the minimum wall thickness of the acoustic barrier unit plate shell is 25mm, and the partition is removed from the inner cavity. The finite element analysis results show that the maximum tensile stress of the shell is lower than the tensile strength of the steel fiber high-strength concrete material 9MPa under the most unfavorable working condition -- the backplane under the bending load of 7.0kPa. The experimental performance study shows that under the bending load of up to 8.0kPa, the unit plate does not crack and the mid-span deflection is small. The noise reduction coefficient of the unit board is 0.75, and the volume isolation is 40dB, which is better than the required standard. The research shows that the unit plate has low weight, the strength meets the flexural performance requirements of high-speed railway in typhoon area, and the sound-absorbing performance is excellent.

Abstract:In this paper, temperature sensors, strain sensors, and displacement sensors are systematically integrated with the dynamic weighing system through sensor network technology to complete the safety monitoring of bridge structures, timely detect bridge damage, provide technical basis for bridge maintenance and management, assist the daily traffic management of Bridges, and ensure the safe operation of Bridges. In this paper, the overall architecture of the system, sensor network system, data acquisition system and software system are elaborated in detail. The discussion of this paper provides a good health monitoring application case for the field of bridge engineering, and has important reference significance for the engineers and technicians engaged in this field.

Abstract:Based on the actual situation of Nanning Yinghua Bridge and the limitations of the conventional pin-joint sling and the anchor head bearing sling, this paper develops a sling with new pin-joint structure and adjusting device to meet the use and construction requirements of Nanning Yinghua Bridge sling. This paper mainly introduces the design process of pin joint structure, new adjusting device and sling tension scheme, and proves the feasibility of the new sling through application in Nanning Yinghua Bridge.

Abstract:This paper introduces the electric isolation protection technology of prestressed anchor cable and its testing method, further studies the main structural characteristics and technical performance of the double-layer electric isolation protection technology of anchor cable, and carries out the outdoor long-term electrical isolation protection performance monitoring and field testing in Taiwan. The results show that the OVM double-layer electric isolation protection cable, which adopts the combination of epoxy sprayed steel strand and cable bellows, can effectively implement electrical isolation protection under wet and other bad conditions, and the isolation resistance value of its permanent protection meets the requirements of European standards.

Abstract:As one of the most important temporary facilities in the construction of suspension bridge cable system, it is very necessary to optimize the design of tower top gantry from the perspective of cost control. In this paper, the background of Tongji Bridge in Guigang City is studied. Based on the principle of technically mature and economically reasonable, the utilization rate of gantry is improved, the loss rate is reduced and the construction cost is saved by changing the connection mode of gantry and optimizing the treatment of column feet.

Abstract:Based on the main cable of Liangqing Bridge in Nanning, the key factors of the breakage of the fixed binding tape were studied by using the method of field production verification and comparison. The results show that the pre-wrapping tension of the fixed binding belt, the speed of winding up of the upper wall of the cable strand, the storage time interval of the cable strand, and the temperature are the key factors that cause the loose yarn, deformation and relaxation of the cable strand in the production process of the main cable strand.

Abstract:In order to better control the measurement accuracy of the steel structure of the FAST cable mesh, it can be controlled by measuring the welded ear plate on the steel structure. The ear plate is used to connect 150 edge main cables of the FAST cable network, and is uniformly welded on the ring steel structure with a diameter of 500m, so the accuracy of the measurement ear plate can reflect the measurement accuracy of the steel structure. Now by using the virtual point measurement method for measurement, that is, the basic principle of symmetric measurement error analysis, determine the main source of measurement error, and formulate corresponding quality control measures during the measurement process, to ensure that the ear plate measurement meets the measurement accuracy requirements of FAST engineering.