Construction method for leveling top surface of bearing during second-time beam lowering after jacking

Abstract

The invention discloses a construction method for leveling a top surface of a bearing during second-time beam lowering after jacking. The construction method forms a high-strength and compact fillingbody between a beam bottom and the top surface of the bearing, so that the newly replaced bearing can bear pressure in an overall balanced manner and the service lives of the bearing and a bridge canbe prolonged. The construction method levels the bearing by virtue of mortar which can perform automatic leveling according to the shape of the bottom of a beam body, thereby avoiding the disadvantagethat steel plates are prone to slide down and the bearing can not be in full contact with the beam body resulting in bias pressure on the bearing when the steel plates are used for leveling, ensuringthat the top surface of the bearing is in full contact with the beam bottom, and enabling stress on the bearing to be uniform.

Description

technical field [0001] The invention relates to the technical field of road and bridge construction, in particular to a construction method for leveling the top surface of a secondary drop beam support after jacking. Background technique [0002] As the first batch of expressways completed in my country have been open to traffic for more than 10 years, expressway bridges have entered the peak period of maintenance. The bridge bearing is an important component connecting the upper and lower structures of the bridge. According to different types, the normal design and service life of the bridge bearing is about 10-15 years. When the bridge bearing reaches the design life or if there is a disease in the bridge inspection, it needs to be replaced with a new bridge bearing. [0003] The current process for replacing bridge supports is to use a fully automatic jacking system to lift the entire beam body off the surface of the support, take out the old support, replace it with a n...

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Problems solved by technology

[0004] In order to solve various diseases after the replacement of the new support, one common treatment method is to use thin steel plates to plug the gap between the bottom of the beam and the top surface of the support layer by layer. The disadvantage of this method is that the structure after the number of steel plate layers Instability, the bond between the steel plate and the steel plate is not firm, the contact surface between the steel plate and the support and the contact surface between the steel plate and the bottom of the beam cannot be fully contacted, so that the force on the support and the beam is uneven

[0005] The other is to use a wedge-shaped steel plate plug between the bottom of the beam and the top surface of the support. The disadvantage of this method is that the shape of each gap is not exactly the same, and it needs to be processed separately, which is time-consuming and labor-intensive. There is also the need to measure the bottom of the beam and the top of the support. The surface shape can only be measured when the beam is completely lifted from the support and is in the empty state. Keeping the beam in the headspace state for a long time will cause great unsafety of the bridge

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