Single-cantilever supporting system for vertically-rotary movable bridge and installing method thereof

Abstract

The invention discloses a single-cantilever supporting system for a vertically-rotary movable bridge. The single-cantilever supporting system for the vertically-rotary movable bridge comprises four sets of supporting devices which are symmetrically arranged on the two sides of a main bridge 0# node of the movable bridge, with two sets on each bank, wherein each supporting device comprises a base, a bearing pedestal, a bearing and a pivot; one end of the pivot is connected with the bearing pedestal through the bearing; the other end of the pivot is a cantilever end; a bearing sleeve C is arranged between the pivot and a web plate A of a main bridge 0# node steel box beam of the movable bridge; the cantilever end of the pivot and a web plate B of the main bridge 0# node steel box beam of the movable bridge are fixed through a bearing sleeve B and an expandable connecting sleeve; the two bearing pedestals on a same bank are symmetrically arranged along a central axis, with the positioning deviation of not more than 1-minus 1 mm; the difference between axis elevations of the two bearing pedestals on a same main pier is not more than 1 mm; and the coaxiality error of the two bearing pedestals on the same bank is not more than 0.6 mm. The single-cantilever supporting system for the vertically-rotary movable bridge can effectively reduce additional stress caused by an installing error, so that the structural reliability is further enhanced and the structure per se is more reasonable.

Description

technical field [0001] The invention relates to a support method of an open bridge, in particular to a single cantilever support system of a vertically rotating open bridge. Background technique [0002] The supporting part of the bridge is the core of the force and operation of the full bridge of the vertical open bridge. Its function is to support the movable half bridge and make it rotate around the supporting pivot to make the bridge open or close. At present, the support of the double simply supported structure is adopted between the openable bridge body and the bridge foundation of the vertical rotation open bridge, such as figure 1 As shown, in a rotating half bridge, two bearings are supported on both sides of the upper and lower half axles of the half bridge, like this, each half bridge just needs four support points 10, in order to make the vertical rotation type open bridge open and The closing process can be free and smooth, and these four support points must be...

AI Technical Summary

Problems solved by technology

The disadvantages of adopting this kind of double simply supported structure support are as follows: First, due to the existence of installation errors during installation, the four support points cannot be completely in a straight line after the installation is completed, which will cause huge damage to the entire support device. Correspondingly, if the installation error is large, the initial stress will be large, and if the installation error is small, the initial stress will be small. However, since this installation error cannot be eliminated, this initial stress will always exist. The existing initial stress will be superimposed with the stress generated by the external load in the use stage in the future, so that the strength of the structural material cannot be fully used to resist the external force, which has buried a huge hidden danger for the normal operation of the bridge structure; In the case of non-collinear support points, the disadvantage is more obvious during the pivoting process of bridge opening and closing. After pivoting, there is a clear tendency to twist the four non-collinear support points to the axis direction. While constraining this torsional trend, another restraining stress is generated, which will also reciprocate with the opening and closing of the bridge, and the damage to the structure has even greatly exceeded the effect of external loads on the structure. , also has an adverse effect on the durability of the bridge structure

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