LRB lead rubber bearing construction method

Construction preparation

Check whether the specification, model and quantity of LRB lead rubber bearing meet the design requirements, and whether the appearance has defects such as damage and deformation.
Prepare tools and equipment required for installation, such as crane, jack, wrench, level gauge, etc.
Clean the top surface of the bridge pier and abutment to ensure that it is flat, clean and free of oil stain, debris, etc.

LRB lead rubber bearing installation
Lift the LRB lead rubber beam slowly to the installation position on the top surface of the pier and abutment with the crane. During hoisting, it shall be kept stable to avoid collision with pier and other objects.
The position and elevation of LRB lead rubber beam shall be adjusted so that the center position overlaps with the design position and the top elevation meets the design requirements. Jacks, spirit levels and other tools can be used for adjustment.
When the position and elevation of LRB lead rubber beam are adjusted, use connecting bolts to fix it with the top surface of pier and abutment firmly. The bolts shall be tightened symmetrically and uniformly to ensure uniform stress on LRB lead rubber beam.
1. Assemble the lower and lower connecting plates, LRB lead rubber beam and upper embedded parts on the ground;
2. When the concrete of substructure reaches the design strength of 75, the screw holes of embedded parts shall be cleaned and coated with grease, and then grease and felt shall be used as an isolation layer to prepare for future replacement.
3. Lift it in place according to the LRB lead rubber beam layout plan No.
4. Fix the lower connecting plate firmly on the lower embedded parts with high-strength bolts.

Installation quality inspection
Check whether the installation position of LRB lead rubber beam is correct and whether the appearance is damaged or deformed.
Check whether connecting bolts are tightened and gaskets are complete.
Use a level to measure the top elevation of LRB lead rubber beam to see if it meets the design requirements. In case of any deviation, it shall be adjusted in time.
Measure the center position of LRB lead rubber beam with total station to see if it is consistent with the design position. Any deviation shall be adjusted.
Follow-up work
When LRB lead rubber beam is installed, it shall be protected from collision, pollution, etc. It can be surrounded by protective barriers or covered with protective materials.

The original website of the article: https://www.seismic-isolation-bearing.com/lrb-lead-rubber-bearing-construction-method/

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