1. Application range of Bridge Girder Erection Machine for High Speed Railway
The bridge girder launcher is designed for highway and railway. According to the situation of present railway with less sub grade, more bridges and tunnels which connected too closely, our company design and manufacture the new box-girder bridge girder launcher with double girder. It is mainly used for hoisting (lifting) of concrete girder in bridge construction (bridge building) of general railway and highway.
2. Main features and advantages of Bridge Girder Erection Machine for High Speed Railway
● The machine is a special hoist equipment used for lifting the concrete girder on the high-speed railway construction. It can lift 900t precast concrete girder.
● It is very convenient to accomplish the span-shifting from 32m to 24m when move the legs.
3. The design basis of Bridge Girder Erection Machine for High Speed Railway
We design the bridge girder launcher according to the rules of the newest machinery and crane in China, the rules are following:
● 《Cranes–Test code and procedures》 GB5905
● 《Safety regulations for hoisting machinery》 GB6067 《Code for design of steel structures》 GB50017
● 《Safety technology specification for special equipment》 TSG Q7002、Q0002
● 《Code for construction and acceptance of steel structure》GB50205
● 《Standard for quality inspection and evaluation of steel structure engineering》 GB50221
● 《Weld Outer Dimensions for Steel Construction》GB10854
● 《Code for construction and acceptance of electric equipment installation engineering》 GB232
● 《General technical requirements of assembly》 JB/ZQ400.9
● 《Mechanical properties of fasteners》 GB3098
4. Main design requirements of Bridge Girder Erection Machine for High Speed Railway
● Technical index；
Safety factor 1.5
Using grade： U3
Load state： moderate
Working grade of the whole machine： A3
Working grade of the mechanism：M4
Working condition and requirements of design etc.
● Calculation analysis and check-calculation of the whole structure According to technology condition of design of crane, we confirm the construction condition, and then calculate and analyze the strength, stiffness and stability.
After the classical calculation, we start the calculating work of design of steel structure, and adopt the finite element analysis, the load applied to models respectively, and then calculating and analyzing beam element and plate element. Finally, the authoritative department will check and calculate again.
5. Main mechanical manufacturing technology of Bridge Girder Erection Machine for High Speed Railway
There are many mechanical manufacturing (machinery-building) technologies; the rules of management are following:
● Firstly, the technology department reviews the drawing from manufacturability.
● Drawing up the technology guide book and making procedure qualification.
● Making welding procedure card, mechanical manufacturing card, assembly process, camber drawing of box girder according to drawing , rules and criterion ; emphasizing the size of welding angle, geometry size and requirements of assembly etc.
● Designing the assembly technology clamp according to the requirements of drawing.
● Making the finishing time of manufacture and patrolling card according to the requirements of drawing; controlling the quality of manufacture strictly.
6. The quality control in Bridge Girder Erection Machine for High Speed Railway manufacturing process
Technology file drawing and project are handed to production department which assorts with related department and quality department to process, manufacture, control, check and accept of product.
The workshops do the following work according to drawing:
● blanking splicing（technology and requirements of blanking splicing）
● assembling welding（welding procedure card, welding technology qualification and welding record）
● mechanical manufacture（mechanical manufacturing card）
● finishing time of manufacture and patrolling card
● Assembly（assembly technology）
● checking descriptive chart（controlling the geometry size and key part）.