Research of hydration temperature field and temperature control in double-line railway box girder bridge;

The paper takes a cable-stayed bridge with couple tower,couple cable,three-span prestressed concrete beam and steel truss composite beam for example,analyzes and compares various factors that affect the vertical rigidity of composite beam cable-stayed bridge of double line railway.

According to construction of prestressed concrete simply supported box beams of the double-track railway,the solid three-dimension finite-element model is established using the SAP90 program.

Model experiments with a geometric similarity ratio of 1∶30 were carried out to investigate the ground pressure and internal force of up and down bamboo-truncating tunnel portals for single-track railway.

Technology, safety, economy and feasibility of the signaling system are analyzed to tackle a series of new issues emerged while increasing the speed of existing single-track railway to 120km/h or above.