Jacking-first and line-reinforcement-second jacking construction method for frame bridge

Abstract

The invention relates to a jacking-first and line-reinforcement-second jacking construction method for a frame bridge. The method comprises the following steps: arranging a movement-resistant ground anchor; temporarily closing a first strand of line; respectively connecting the other end of each of two steel wire ropes in the movement-resistant ground anchor to a position which is one third to two-thirds of the width of the first strand of line and tightening; removing the existing frame bridge below the first strand of line and jacking a large case to the other side of the line until the large case is positioned below the first strand of line; reinforcing the first strand of line; repeating the above steps to jack large cases below the rest of lines until the whole jacking construction process is completed. Under the condition that the conventional reinforcement method can not be used for construction, according to the jacking-first and line-reinforcement-second jacking construction method, the jacking is firstly carried out, the line is tightened by the movement-resistant ground anchor during the jacking so as to prevent the transverse motion of the line, the single line is reinforced to establish small reinforcement systems, and the small reinforcement systems are gradually connected into a whole reinforcement system. Accordingly, the invention has the advantages of reasonability in construction process design, convenience in construction, short construction time limit and low construction cost.

Description

technical field [0001] The invention belongs to the technical field of railway construction, and in particular relates to a frame bridge jacking construction method that first jacks and then reinforces the line. Background technique [0002] With the rapid development of urban construction, the traffic volume is also increasing. The frame bridge has become a new way to solve the intersection of railway and highway. The railway is laid on the bridge, and the bridge hole is used for the passage of vehicles and pedestrians. However, because some existing frame bridges can no longer meet the requirements of use, it is necessary to build new frame bridges in situ. At present, the jacking method is commonly used. The specific method is to reinforce the existing line above the old frame bridge before the jacking construction, that is, to first build the foundation on the other side of the line opposite to the large box to be jacked to form the frame bridge. Concrete anti-movement...

AI Technical Summary

Problems solved by technology

However, in some special cases, such as a project located in a railway station, so many lines are involved. A total of 8 lines span the existing frame bridge, and the concrete continuous slab girder of the existing frame bridge is under the rails, and the rails are inlaid In the continuous slab girder, that is, there is no gap between the continuous slab girder and the rail, so the line cannot be reinforced in a conventional way before jacking construction

In addition, in order to speed up the construction, the top method is usually adopted in this case, so it is impossible to install anti-movement piles on the other side of the line

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