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During the construction of bridge bearings, if rubber bearings are used, then the temperature must be paid attention to. The construction of thermal insulation fixed bearings in winter should be paid attention to.
Closed thermal insulation measures are set around the concrete mixer to prevent snow, ice and other debris in the mixer from interfering with the work of the mixer.
In winter, the mixer should follow a reasonable feeding sequence for easy operation.
Construction personnel should wear non-slip shoes in rainy and snowy weather. After the thermal insulation fixed support arrives at the site, the certificate of compliance, the list of accessories and the relevant material report or inspection report shall be checked.
Place the qualified finished heat-preservation internal fixed support horizontally on the beam storage base or mobile carriage, keep the height difference of the top of the four bridge supports ≤ 2mm, and tighten the connection bolts between the bridge support and the beam body. The direction of the fixed end and the movable end should be placed correctly according to the erection direction of the box beam.
The field adopts small-scale equipment for mechanical mixing, the free height of pouring is above 3m, and the height between the top surface of the supporting cushion and the bottom plate of the bridge support is controlled in the range of 20-30mm.
The perfusion should be continuous without interruption. In case of interruption, it should not exceed the initial setting time of the previous layer grouting. All gaps such as anchor holes must be filled and tamped, and reliable measures must be taken to prevent slurry leakage. Strengthen the maintenance work and pay attention to the heat preservation and maintenance measures for winter construction. The number of test blocks produced meets the verification requirements. In winter, pay attention to the above aspects for the construction of thermal insulation internal fixed bearings.