How to cross spans for the beam launcher with no load?

As crossing spans for the beam launcher with no load, below steps shall be strictly followed to ensure a safe and normal operation and running.

ZZHZ beam launcher to cross spans

1. after finishing commissioning of beam launcher, lifting trolleys move near to the rear bracket, stop the moving wheels with wooden wedge, at the same time connect moving wheels and main girder with steel wire rope to avoid instability of trolleys as the beam launcher moves longitudinally;
2. cylinders of auxiliary middle support leg and rear bracket jack up to make the complete machine go up, the middle support leg moves forward 19m with its own hanging device, rear bracket draws back cylinder to move forward 19m, then the beam launcher falls down, lifting trolleys move near to the rear bracket, the complete machine is ready to move longitudinally to cross spans;
3. the complete machine moves forward 19m depending on roller institutions of front and middle support legs and rear roller, auxiliary front support leg supports on the front pier, and lifting trolleys at the same time move near to rear bracket;
4. cylinders of auxiliary middle support leg and rear bracket jack up to make the complete machine go up, the middle support leg moves forward 20.5m with its own hanging device, rear bracket draws back cylinder to move forward 16m, then the beam launcher falls down, lifting trolleys move near to the rear bracket, the complete machine is ready to move longitudinally to cross spans;
5. front support leg draws back cylinder to leave the pier and moves forward 40m with its hanging device to the proper position, then drop down moving gearbox and transverse moving rail (front support leg can set transverse moving rail), adjust them to required height, then connect front support leg and pier cap firmly;
6. the complete machine moves forward 21m to the proper position depending on roller institutions of front and middle support legs and rear roller, then make a preparation for installing girders;
7. after crossing spans, a comprehensive check must be done to ensure: whether levelness of main longitudinal girder meets the demand; whether bolts and pin connection is firm; whether electric circuit is correct; whether electric wire is damaged and the hydraulic system works well; whether rail joints are smooth; whether jointing for launcher and trolley limited block is firm and stable; whether rail clamping device is in work; whether layout of sleepers is smooth and steady and rail gauge it correct, and other conditions;
8. check for trial operation with no load of beam launcher must be done, especially check the rail layout before lateral moving of the machine; clean sundries at two sides of lateral moving rails, then make trial operation 2 times on the rail, check whether it will have rail gnawing as the beam launcher moves on the rail, solve it immediately if rail gnawing. The beam launcher can install girders after ensuring all works normally.