How to apply temporary bridge supports

Application of Temporary Support for Sand Pipe

In daily engineering project construction, the principle and technology of sand tube temporary supports have been widely applied in continuous bridge construction. Temporary supports are very common in the construction of bridges with simple supports followed by continuous structures. Due to the advantages of flexible disassembly, high reliability, and relatively low price of this sand tube temporary support, it has certain value in practical applications, and many engineering projects have borrowed this form of support.

Practical application of temporary supports

In practical use, attention should be paid to the height of temporary supports. After placing the small box girder, the top surface of the cushion block on the temporary support should be 2cm higher than the top surface of the permanent support, and the top surface of the sand box should be 3cm~4cm lower than the water retaining support. The screw switch should be slightly lower in the middle of the sand box, and it can be tilted upwards for easy sand flow out.

Types of temporary supports

There are two methods for traditional temporary supports. One is to use sulfur mortar, which has the advantages of fast strength growth, good compressive strength, and softening under heat under normal conditions. But the disadvantage of this temporary support is that the equipment process for sulfur mortar is relatively complicated; The second is the temporary support for the sand cylinder and sand box. After calculation, a steel pipe with an appropriate diameter is selected to manufacture the sand cylinder. The bottom of the sand cylinder is welded with a steel plate for sealing, and a screw hole is left on the side and blocked with a screw. An appropriate amount of fine sand is loaded into the cylinder, and a piston slightly smaller than the diameter of the sand cylinder is placed on top of the fine sand. The piston can be made of concrete, wood, steel plate sealed steel pipe, etc., so that the top surface of the piston is 3-5CM higher than the sand cylinder. After loosening the bottom screw, the fine sand in the bucket is released, achieving the purpose of removing the temporary support and completing the transformation of the.

Application of Temporary Bridge Bearings

The use of temporary supports is a key link in the transformation of bridge systems. The role of temporary supports is to complete the simple support construction of the bridge and prepare for the subsequent bridge deck construction and final system transformation. After the system transformation, the correct force method is formed, and the continuous beams act on the formal supports, while the temporary supports need to be removed.