The deviation of bridge support is a common problem existing in the installation of bridge support at present. The serious deviation of bridge support will cause diseases such as uneven stress on the support and excessive additional internal force on the beam body, so it is very important to correct the deviation of the support

Reasons for bridge support deviation:

Mainly is the support or cushion stone lofting is not allowed, should be checked when the support installation, such as the cushion stone position has a small deviation can be adjusted by epoxy mortar, such as the deviation is too large should be re-poured cushion stone.
Rectify the deviation of bridge support to improve the safety of bridge operation.

Bearing rectifying

Main measures for bridge support deviation correction:

Eliminate the horizontal and longitudinal component that makes the beam body deviate;
Welding chock shaped steel plate at the bottom of all eccentricity beam body steel plate, chock shaped steel plate at the bottom of eccentricity beam body and the overall lower surface level formed by chock shaped steel plate, so as to restore the horizontal state of the steel plate on the support, in order to eliminate the horizontal longitudinal force on the impact of the eccentricity beam body.
To offset united all deviation across the bridge beam body to form a temporary consolidation by pushing overall, and will offset deviation toward the side of the temporary rigid fixity all across the bridge beam body to form a force as a whole, the purpose is to rectify deviation of the beam body reaction through the stress distribution of horizontal thrust to the abutment and the earth as a whole.
Jacking device is installed on the top of all piers corresponding to offset connection. Jacking device will jacking the corresponding offset beam body to form a gap between the offset beam body and the corresponding pier upper support.
Sync jack-up formed inside the gap setting temporary sliding support, temporary sliding support including stainless steel plate and the teflon plate, stainless steel plate above the teflon plate, stainless steel plate and teflon plate between silicone layer again, to make the stainless steel plate and teflon plate can slide freely, and then cancel the jack-up device support make the beam body falls in temporary sliding support
A reaction frame is set between the span deviant beam body close to the stressed whole and the bridge pier top cover beam under the span deviant beam body, and a deviation correction jack is installed between the transverse plate of the span deviant beam body and the reaction frame.
The beam body is pushed longitudinally by the rectifying jack, and then the beam body is pushed to complete the eccentric connection. The force generated by the reaction force generated by the eccentric connection is transferred to the abutment and the earth as a whole.
Deviation rectification in place after, dismantle the counterforce frame, start the jack-up device made of beam body relatively lower bearing dangling after rectifying, set up temporary sliding support, then cancel the jack-up device support make beam body drop and dismantle jack-up device, make all bridge across the connection between the relationship and connection relationship with the bridge pier beam body back to the front of the rectifying state.



Key words: bridge support deviation correction support deviation correction