Installation And Construction Of Laminated Rubber Bearing -1
The rubber bearing is an important position at the connection point of the upper and lower structures of the bridge, and its reliability directly affects the safety and durability of the bridge structure. Therefore, in addition to ensuring that the design and selection of rubber bearings are reasonable and the processing quality meets technical standards, correct construction and installation are the key to the success of rubber bearings.
1. Setting of supporting stone
In order to ensure the construction quality of the rubber bearing, as well as the convenience of installation, adjustment, observation, and replacement of the bearing, whether it is constructed by the cast-in-place beam method or the precast beam method, no matter what type of rubber bearing is installed, place it on the top of the pier. It is necessary to set up a supporting stone. (Picture 1-1, 1-2, 1-3)
The plane size of the supporting stone should be able to withstand the superstructure load. Generally, the length and width should be about 10cm larger than that of the rubber support, and the height of the cushion should be greater than 6cm to ensure that there is enough from the bottom of the beam to the top of the pier. The height of the space is used to place jacks (or flat jacks) for use when the supports are replaced.
The reinforcing steel mesh should be arranged in the cushion stone of the support, and the vertical steel reinforcement should be connected with the steel reinforcement in the pier. The cement number used for pouring the cushion stone should be no less than No. 250, and the top surface of the cushion stone concrete should be pre-standard with a level and strive to be flat and not smooth.
The elevation of the top surface of the supporting cushion should be accurate and consistent, especially when two supports are installed at one end of a beam, the horizontal error of the top elevation of the supporting cushion of this beam should be strictly controlled. The top surfaces of the supporting cushion stones of two or four supports of the same beam should be in the same plane to avoid bias, initial shear, and uneven force.