On the basis of analysis of the theory of mechanical-hydraulic power match system,an electro-hydraulic proportional power match system which was suitable for matching TLC900 transporting girder vehicle of the engine was developed according to the driving force-speed curve and parameter,and the control rule and program flow chart about the system were also given.

The paper analyzes the hydraulic system of the 900t transporting girder vehicle with the traditional mid-ship single stinger and the large tyres.

Combining with the practical project of 900t box--beam erecting of track communication project between Beijing and Tianjin,this paper introduces the technical functions and contraction techniques of beam--lifter MGHZ450,assisting beam--transmitting bridge erecting machine LG90H and beam carrier TE900H16.

According to the need of construction for the gantry-type of PC single-railed beam in the city traffic in Chongqing city, this paper gives the design of carrying and installing equipments - JQ60 type of beam carrier and YL60 type of bridge installing machine - for this kind of beam.

By means of the multi-functional beam carrier,which may carry the box beam segments from the pre-casting lot to the bridge-maker,and help it perform the span-crossing operation with the beam-carrier as its supporting point for handling,the pre-casting of box beams and the segment assembly of bridges can be integrally combined.

Research and characteristics of 900 t beam transporting vehicle;

The design scheme of the electrical system on 750 t flat car for transport of sills is described.