What are three major resons for overturning of beam launcher?

There are three major resons to cause overturning of beam launcher:

Beam launcher accident

1. Its own reason of beam launcher

The beam launcher has a higher center of gravity and large axle weight as it moves without self protective device, once the beam launcher is found tilted, we can do nothing but witness overturning of beam launcher.

2. Bad maintenance of equipment

The beam launcher is of large and complicated bridge construction equipment, each part or wrong operation may cause overturning of beam launcher. If a bad maintenance leads to trouble of brake, the beam launcher may derail and overturn.

3. The reason of roadbed and lines

Bad quality of roadbed and lines is major reason to cause overturning of beam launcher. Some roadbed hidden dangers lie in new line and existed lines such as grave, arc stone pit, local backfilling, water immersion and transfusion and other conditions. Therein every condition caused one or two overturning accidents before. Especially un-solid filling between abutment and bridge head often occurs, where accident-prone area is.