Abstract:The stability of strain sensors has always been a concern in the domestic sensor industry and engineering testing industry. There are many indicators of strain sensors, and there is no simple mathematical relationship between the indicators, so the long-term stability of sensors cannot be studied in a general manner. In this paper, the working principle of strain sensor is given, and the essential reasons for the instability of strain sensor are discussed from the aspects of Strength of materials, quantum mechanics and electronic mechanics, and the common methods to improve the instability of Strain gauge are summarized. The discussion in this article has certain reference value for the design and engineering application of strain sensors

Abstract:There are many and complex factors that affect the anchoring effect of prestressed anchor cables, and each factor also affects each other. The loss of anchoring force is closely related to the properties of rock and soil. Through theoretical analysis, experimental research, numerical simulation, and other methods, the influence mechanism of creep deformation and compression deformation of rock and soil on anchoring force loss is studied. The law of prestressed anchor cable anchoring force loss caused by hard rock, weak rock, broken rock, and soil is studied. The research shows that the properties of rock and soil are different, The loss of anchoring force caused by prestressed anchor cables is also different: the better the quality of the rock and soil, the smaller the loss of anchoring force under the same initial anchoring force conditions. This research achievement can guide the design, construction, and operation management of anchoring engineering, which is beneficial for improving the economic and social benefits of anchoring engineering

Abstract:To study the seismic characteristics of reinforced concrete (RC) short columns strengthened with prestressed steel strands, 7 specimens were subjected to low cycle repeated loading tests. The experimental study investigated the effects of axial compression ratio, characteristic values of steel strand configuration, and prestress level on the seismic performance of reinforced short columns. The results show that prestressed steel strands can effectively improve the seismic performance of RC short columns, significantly improving their ductility and energy dissipation capacity. Compared with the unreinforced specimen PC1, the displacement ductility coefficient and cumulative energy dissipation capacity of the reinforced short column with prestressed steel strands are increased by 1.87 times and 6.78 times, respectively. The amount of steel strands and the level of prestressing have a significant impact on the hysteresis curve of the reinforced column. When other conditions are the same, The hysteresis curve of specimens with a large amount of steel strands or a high level of prestress is fuller; For specimens with low axial compression ratio (n ≤ 0.30), good seismic performance can be achieved when the characteristic value of the steel strand configuration reaches 0.119 and the pre-stressed water is not less than 0.40. On the basis of experiments, a formula for calculating the shear bearing capacity of RC circular short columns reinforced with prestressed steel strands was proposed, and the calculation results are in good agreement with the experimental values. The results provide reference data and design calculation methods for strengthening RC short columns with prestressed steel strands

Abstract:Based on the analysis of the causes of slope collapse and the mechanism of pre-stressed reinforcement of slopes, this paper proposes ideas such as controlling water before slope treatment, and reasonable use of combination reinforcement methods. It emphasizes the application of new technologies such as pressure type anchor cables, pressure release anchor cables, and anchor cables for corrosion and rust prevention in treatment engineering

Abstract:The hydraulic system is the most core component of the walking type pushing device. By analyzing the construction process of the walking type pushing device, a hydraulic system that meets the various performance indicators of the walking type pushing device is studied. Through in-depth research on hydraulic principles, actuator action processes, component selection, etc., the walking type pushing is achieved to complete the pushing forward of the box beam according to the specified construction method. The average pushing speed of the walking type pushing device is about 5m/h, and the synchronous accuracy of pushing on both sides of the same pier is<3mm, and the synchronous accuracy of pushing between each pier is<4mm; The synchronous accuracy of lifting or lowering the box beam with the same side jack is less than 3mm, fully meeting the functional and accuracy requirements of the walking type pushing device

Abstract:The hydraulic system is the most core component of the walking type pushing device. By analyzing the construction process of the walking type pushing device, a hydraulic system that meets the various performance indicators of the walking type pushing device is studied. Through in-depth research on hydraulic principles, actuator action processes, component selection, etc., the walking type pushing is achieved to complete the pushing forward of the box beam according to the specified construction method. The average pushing speed of the walking type pushing device is about 5m/h, and the synchronous accuracy of pushing on both sides of the same pier is<3mm, and the synchronous accuracy of pushing between each pier is<4mm; The synchronous accuracy of lifting or lowering the box beam with the same side jack is less than 3mm, fully meeting the functional and accuracy requirements of the walking type pushing device

Abstract:The installation of stay cables is an important part of the construction of large-span cable-stayed bridges. Taking the construction and installation of stay cables for the Guanhe Bridge on a high-grade highway near the sea as an example, by analyzing the different traction control conditions of the Guanhe Bridge's stay cable construction, a more optimized suspension plan is obtained. This plan can reduce the difficulty of anchoring and installing the stay cable at the beam end, improve the installation efficiency of the stay cable construction, and ensure safe, high-quality, and efficient construction quality

Abstract:In view of the lack of U.S. standard reference content in the performance test of anchorage system, the U.S. Post-Tensioning Prestressing Institute (PTI) released in 1998 "Acceptance Standards for Post-Tensioning Systems" (Acceptance Standards for Post-Tensioning Systems), supplemented by perfecting the content of the recognition of the clamped strand anchorage system, for the reference of the domestic industry, production, scientific research and certification units.