Auxiliary Piers is Additional Security Barrier Semi-trailer

Auxiliary piers is additional security barrier semi-trailer. In semi trailer design process, most designers think using two 25 tons of leg can completely satisfy the semi-trailer under the condition of no-load or overloading, connected to the tractor or decoupling, still put the total quality of 40 tons of bearing under the condition of gravity and impact requirements. As a user, based on the following two semi real accident cases and improve the operation process of safety of semi-trailer, requires the designer to consider setting auxiliary piers between two legs.

A: (1) the case under the working condition of overloading hanging off, because the ground not level off, two legs stress non-uniform, leg internal gear group of sudden failure, brush teeth occur, tank gravity between 8 groups of leg and frame all the connecting bolts of tangential shearing; Eventually led to the semi-trailer first half suddenly collapsed.

Hang liquefied petroleum gas (2) the case 2: tractor semi-trailer, for tractor tray latch not completely reset, semi-trailer drive suddenly from tractor traction pin tray, semi-trailer first half suddenly collapsed.

(3) fortunately two accidents of semi-trailer has some auxiliary piers for help, to avoid the tanks damaged due to head directly impact with the ground before the malignant accident.

4, the above mentioned accident cases, one is a semi-trailer in highway bridge approach because of the speed too fast, the turn concrete guardrail and light pole sweep off the tank guardrail and the left side of the valve box, direct toppled off a bridge; The integration of the structure of the gas liquid phase in the cabinet emergency cut-off valve and loading and unloading of ball valves for the liquid phase in the flange connecting flange parts cut, gas mouth flange connection bolt fracture bend, flange, and assembly parts, two pipe leakage and fire; Due to the complexity of the scene environment and cracking, the structure of the leak, eventually could not be ideal fire containment measures, and adopt the mode of tank fire control water cooling control, let the tank of liquefied petroleum gas burns completely.