Steps to Install Girders for HZQ50/150 Bridge Girder Launcher

After researching and analyzing current highway?bridge girder launcher?at home and abroad, combining with our successful experience, ZZHZ develop and produce HZQ50/150 walking type bridge construction machine according to practical situation.

launching gantry

According to layout of bridge girder section, the bridge girder launcher is designed as honeycomb type double girder machine with 6m central distance between two girders, which features reasonable bearing capacity, good lateral stability and high safety. For convenience, reliability, safety and working performance, the bridge girder launcher is better than others. Steps to install girders are as follows:

Move from one pier to another pier, feed-in girder and install girder

Step 1:

After finishing installation, check the operating condition of the whole machine. If everything is ok, drive girder carrier with precast girder to rear part of bridge girder launcher to prepare for crossing piers.

Step 2:

Hydro-cylinders in front support and rear support lift main girder to a certain height, put pin roll into drivepipe. Middle support with transverse sliding rail moves forward to50mdepending on its hanging beam. Put down middle support and transverse sliding rail to lay a solid foundation.

Step 3:

Hydro-cylinders in front support and rear support are driven to get pin roll out, the whole machine drop down. Main girder stands on roller wheel of middle support and rear bracket, front and rear trolley moves near to middle support. Then start roller mechanism of middle support and rear bracket to make main girder move forwards20m, front trolley and rear trolley move backwards20mat the same time.

Step 4:

Cylinder in rear bracket takes back to make main girder suspend in the air, then main girder moves forward30mwith its own hanging device. Then keep rear bracket in a level and plug in pin roll. Take back cylinder in rear support, moves two trolleys to rear part

Step 5:

Start roller mechanism of middle support and rear bracket, make main girder move forward15m, two trolleys backward15m

Step 6:

Two trolleys continue to move backward to rear part of main girder, girder carrier puts precast girder in certain place, rear trolley lifts one end of girder

Step 7:

Start roller mechanism of middle support and rear bracket to move main girder forward15m, then front support is jacked onto front abutment to meet demand of installing girder. Check operating condition of the whole machine to prepare for installing girders