Downward-moving formwork used for highway box girder in road-rail joint construction section and its application method

Abstract

The invention discloses a descending movable framework for a highway box girder at a highway and railway combined construction section and an application method of the descending movable framework and relates to the field of bridge construction. The descending movable framework comprises bearing girders, guide beams, support devices, lifting support frames, a template system, a bottom die opening and closing system and a longitudinal shift system. When the descending movable framework for the highway box girder at the highway and railway combined construction section is at the state of concrete pouring, the lifting support frames are abutted to the lower end faces of the bearing girders, at the middle positions of every two pier bodies, the pouring load of the highway box girder is transmitted to other structures, and the lifting support frames are composed of distribution beams, upper sleeve rods, pin rolls, lower sleeve rods, sleeper beams, platforms, sand cylinders, jacks, rigid pads, walking wheels and steel rails. According to the descending movable framework and the application method, the additionally arranged lifting support frames with liftable height can effectively solve the technical problems of stress and hole passing of the framework.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a downward moving formwork used for a highway box girder of a road-rail joint construction section and a method for using the same. Background technique [0002] With the increasing shortage of bridge site resources, there are more and more bridges built in conjunction with highways and railways. However, the superstructure of bridges in the road-rail joint construction section is mostly a standard-span concrete box girder, and the bridge height is high, so the mobile formwork method is often used for construction. [0003] For highway box girders, it has the characteristics of wide box girder width, small height, whole pier framing, and limited space for through holes. The use of upward mobile formwork can effectively overcome the influence of the above unfavorable factors, but there are disadvantages such as large steel girders for the load-bearing main girder, difficult hoi...

AI Technical Summary

Problems solved by technology

For the above unfavorable factors, even if the height of the load-bearing main girder is lowered by using the beam-mold-integrated downward mobile formwork, it can effectively solve the problem of formwork passing holes, but there is a problem that it is difficult to bear the box because the height of the load-bearing main girder is too low. Beam pouring load and construction load problems

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