Abstract:By analyzing the causes of frequent cracks in the web of bridge box girders, it is shown that the existing anchorage system of fine-rolled rebar has the defect of excessive retraction, and a feasible anchorage system that can effectively solve the problem of excessive retraction is put forward - strand vertical prestressing anchorage system, and the tensioning process and equipment are improved, so that the tensioning is easy to operate and reliable. The operation is convenient and reliable. The strand vertical prestressing anchorage system can ensure the designed prestressing in the box girder web, and can effectively improve the durability of the box girder web.

Abstract:This paper analyzes the application status quo of pre-stressing anchor cable in China, puts forward the solution to solve the deterioration of pre-stressing anchor cable through the structural improvement and optimization of the anchor cable, reveals the advanced technology of whole bunch extrusion and shear dispersion applied to the new CPS shear dispersing anchor cable, and discusses the action mechanism of CPS shear dispersing anchor cable. According to the results obtained in this paper, the CPS shear dispersed anchor cable system with small drilling holes, high bearing capacity and high corrosion resistance will bring great benefits to the geotechnical anchorage construction in China.

Abstract:The main bridge of Beipanjiang Bridge of Shuibai Railway is a top-loading steel-tube concrete arch bridge with a span of 236m, and the weight of single-hinged plane transporter used in the construction reaches 104,000kN.This paper introduces the structural design of the main bridge and the transporter construction method used in the main bridge.

Abstract:（接续上期）

Abstract:Jinliwen highway contract section 17 K81 + 635 - K82 + 000 section of high slope landslide treatment, the introduction of Taiwan's deep foundation pit commonly used in the recovery of prestressing anchors - pressure dispersing anchor cable, the prestressing anchors in the application of high slopes in the country for the first time. This paper introduces the hole-making technology of pressure-dispersed prestressing anchor cable in the construction and the precautions in the construction of mat pier and ground beam for similar projects.

Abstract:In this paper, by introducing the successful application process of pressure-dispersed anchor cable in the slope reinforcement of Changhun First Class Highway, it is clarified that the use of pressure-dispersed anchor cable, supplemented by the second splitting grouting technology, solves the problem of the bearing capacity of the anchor cable under the soft rock layer and complex geological conditions.

Abstract:Jiangxi Province Tai (and)-Gan (state) highway is in the mountainous and hilly area, in which there is a section of high slope maximum excavation of up to 98 m. Geological conditions for the whole weathering ~ strong weathering granite, was a fractured structure, is very easy to produce the phenomenon of slumping, sliding, etc., affecting the stability of slopes. In view of the engineering geological conditions of this section of the graben slope, the design of the comprehensive consideration of the use of pre-stressing anchor cable reinforcement program. In this paper, through the engineering practice of prestressing anchors in the high and steep road graben slope and geological conditions under the application of the construction of the key points, methods, monitoring and measuring and attention to such aspects as elaborated!

Abstract:The comprehensive pipe trench of the main road of Chenggong in Kunming City is from Kunming city to Chenggong New District, and the pipe trench passes diagonally through the Kunyu Highway, which has a busy traffic. In order to ensure the normal operation of the Kunyu Highway during the construction period, the project for the first time adopted a two-way tensile steel box culvert pipe trench, under the Kunyu Highway through the new construction technology.

Abstract:It introduces the transportation and erection technology of large-tonnage railroad girders under complex environmental conditions. The rail girder weighs 190 tons, choose French Williams TG300 locomotive and French NICOLAS trailer to transport the girder, the transportation line is to pass through the busy canal, using the open type lifting trestle to solve the contradiction that the girder carriers pass on top, and the following continues to be navigable. When erecting the girders, the gantry girder erection machine specially designed and made for the general area is used; the gantry girder erection machine and the combination of the special area is used, and the erection purpose is achieved through the longitudinal and transversal movement.