How to install and inspect the Bailey Bridge?

In the rapid economic development in the 21st century, as packaged bearing component of the most widely applied in our country, economic and convenient bailey beam in the engineering construction especially widely used in the construction of the auxiliary bridge. Bailey panel has a simple structure, convenient transport, quick erection, large capacity, good compatibility, the characteristics of strong adaptability.

Next, Zhenjiang Great Wall Heavy Industry, the manufacturer of Bailey Bridge, will take you to know more about relevant knowledge.

Construction steps of bailey frame support

Bailey plate steel bridge is generally made of 10# channel steel welded shape truss, the size of each piece is 3m×1.5m, both ends of the male and female connecting head, assembly with connecting pin connection; In order to strengthen the stiffness of the joint, the joint is strengthened with a connecting piece, the size of the connecting piece is 0.5m×1.0m, And there are bolt holes on the bailey steel bridge and the connecting piece, which are connected and fixed by bolts during assembly. According to the force needs, it can be assembled into single row single layer, double row single layer, single row double layer, double row double layer and other forms. The upper and lower strings of the truss pieces can be strengthened by additional strings to meet the needs of various loads.

During construction, serpentine columns are embedded on the pier columns (column height is 1.5m, 0.55m higher than the new appearance of the bridge), and I-steel is installed on the welded steel plate on the serpentine columns, and then the I-steel is attached to the Bailey plate steel bridge truss, and three serpentine columns are embedded on each pier column. The bailey frame adopts the structure form of double row single layer (a total of four rows of bailey plate steel bridge trusses), among which the space between the first row and the second row is 50cm; 3m between the second and third rows; The spacing between the third and fourth rows is 50cm.

A safety platform is formed at the lower part of the bridge by welding the tensile bars, and 78 tensile bars are actually used in each span. In order to prevent the deflection caused by force deformation in the middle part, the two ends of the bailey frame are welded to the abutment column reinforcement, and the bailey frame and bailey frame are reinforced with scissors support connection.

In the implementation of hoisting construction, the bailey frame is manually moved to the I-steel through the inclined surface of the lantern frame, which overcomes the process that the large crane cannot complete. During construction, in order to ensure the change after pouring, a pre-arch of 4.5cm was adopted. After practical implementation, the deformation result after pouring was 3cm, which met the requirements of bridge construction.

Bailey steel bridge is widely used in national defense combat readiness and traffic engineering. Bailey bridge also has the characteristics of simple structure, convenient transportation, fast erection, large load, good interchangeability and strong adaptability. Bailey steel bridge in use, should be at both ends of the bridge, erect marked load grade signs, strictly prevent overload operation, and often sent to check.

Inspection items include：

1, observe the various types of pins and bolts of Bailey steel bridge, whether there is artificial damage, whether there is loosening phenomenon, in order to ensure safe passage.

2. Check whether the bridge foundation of Bailey Steel bridge has uniform settlement. If it is found, it should be dealt with in time.

3. Grease around the pin to prevent rain from entering the gap of the pin hole, and grease the exposed thread of all bolts to prevent rust.

4. The mid-span deflection of the bridge needs to be measured frequently to see if it has increased. The speed of deflection increase should be exactly the same as the wear of the pin and pin hole.

5. Check whether the bridge panel is cracked, deformed or uneven, and replace it if necessary.