Study On The Design Of High Speed Railway Bridge Construction And The Performance Of Fiber Reinforced Concrete Column

With the rapid development of economy,high-speed railway is becoming increasingly important.The geology along the high-speed railway is difficult to meet the standard of construction,so most roads are replaced by bridges.Therefore the construction of this bridge is particularly important,the performance of concrete is very important to the structure.The construction organization design is a major basis for engineering construction,managers can arrange the allocation of resources according to the construction organization design in order to achieve the best results.In addition,the construction personnel can be in accordance with the construction organization design of the detailed construction plan,to ensure the quality of the project and construction safety.The use of construction organization design,can make the enterprise to achieve the goal of optimization.This paper,taking the high speed railway bridge as an example,introduces the general situation of the project and the construction organization design principles,characteristics of the project and the difficulty analysis and countermeasures for construction,general construction arrangement principle and project construction schedule and analysis of key line and network construction plans,safety and quality assurance measures,mainly the construction program including the overall construction scheme,construction scheme,construction scheme of bridge subgrade.According to the engineering,the uniaxial compressive strength and fracture of high-strength concrete columns with polypropylene fiber and basalt fiber were studied.The experimental study was carried out with 24 C50 high strength concrete columns of 150mm×150mmx 500mm,which were divided into 8 groups,each of which was composed of three specimens.A group of ordinary contrast column;Three groups of columns were added with polypropylene fiber,polypropylene fiber was mixed with cement content of 0.5%?1%?1.5%(2.40kg/m3?4.80kg/m3?7.20kg/m 3);Three groups of columns were added with basalt fiber,basalt fiber was mixed with cement content of 0.5%?1%?1.5%(2.40kg/m3?4.80kg/m3?7.20kg/m3);A group of column was added with carbon fiber,carbon fiber was mixed with cement content of 0.5%(2.4kg/m3).Uniaxial compression tests show that 1%of polypropylene fiber can increase the compressive strength of the 35.7%,and at the same time,it can effectively restrain the extension of cracks;And 1.5%of basalt fiber can increase the compressive strength of the 11.43%,and at the same time,it can effectively restrain the extension of cracks;From the economic point of view,polypropylene fiber and basalt fiber can be used to replace carbon fiber on engineering application in the future.