Reinforcement mesh is used in bridge anti-consolidation engineering analysis. As a traffic fortress related to human life and safety, reinforcement mesh is very important in anti-consolidation engineering.
1. reinforcement of main girder of original bridge
One is to install cast-in-situ transverse cantilever beam in the space of two holes at the end of beam on pier top, and install prefabricated micro-bending plate on it. Secondly, the prefabricated pedestrian beam is erected in the cantilever part of the cantilever beam. The pedestrian beams with two bridge holes are longer than the main beams, and one end is supported on the side pier cantilever beam and the other end is supported on the special piers on the embankment. This is to prevent widening the abutment. Thirdly, between the flange of the inner side of the pedestrian beam and the old bridge deck, concrete is used to cast the widened part of the bridge deck. The concrete of the bridge deck pavement layer is concretely poured to form the carriageway. In the pavement of the bridge deck and the widened part of the bridge deck, the reinforcing steel mesh is set up to strengthen all the functions. Fourthly, the bridge deck expansion joint is set in the center of the overhanging beam, and the carriageway pavement is extended and erected on the overhanging beam.
2. deck cleaning
Most of the original deck lacks a stable and solid bottom, and its integrity is poor. It is necessary to completely remove the original deck and dig out part of the gravel cushion (if it is non-gravel filler, it is necessary to dig out, replace the gravel filler, compact), and then lay the cement stabilized gravel bottom layer, on which the reinforced concrete deck is poured.
3. development and reinforcement
Proper control of traffic, while opening, expansion and reinforcement. Because the original piers and abutments can be used, the expansion and reinforcement are mainly carried out on the upper structure, so more investment can be saved. As long as the reinforcement plan is properly expanded, the planning load requirements can also be satisfied.
4. abutment reinforcement
The pavement on the back seat of abutment is removed and replaced by 38 # reinforced concrete one-way simply supported prefabricated slab, which is supported on both sides of the wall. The anchoring steel bar with diameter of 25mm is used to connect the side wall. The concrete bridge deck is paved on it, and there is space between the reinforced concrete slab and the backseat filling, so that the live load pressure can be directly applied to the side wall, then the earth pressure on the opposite side wall caused by the live load is reduced, and the shear capacity of the side wall and the friction resistance of the base are increased.
5. main arch reinforcement
In view of this disease, the cross-sectional dimension of the original cross-tied beam is enlarged, and the arch top part of the cross-tied beam is replaced by the diaphragm to strengthen the transverse integrity and force the whole arch width together. Because the main arch ring has large force and many cracks, the arch rib and arch wave part are used to wrap steel mesh and spray concrete to reinforce the arch ring section, so as to improve the stiffness and bearing capacity of all holes.
6. Reinforcement of Negative Bending Moment of Main Girder
There are many cracks in the negative bending moment area of the main girder under general loads, and there are also many net cracks in the upper deck pavement. Such cracks are not only beautiful, but also cause corrosion of steel bars in the main girders and flange plates due to rain water, which affects the service life of bridges. When considering the reinforcement plan, the longitudinal tension reinforcement bar is added according to the accounting material and placed in the original pavement. Because of the negative bending moment effect of the new planning standard, the tensile stress of the bridge deck concrete will reach 3.96 MPa. The steel fiber concrete is selected, whose tensile planning strength may be greater than the tensile stress, and then the crack will not appear on the bridge deck. 。 In reinforcement, steel fiber concrete should be used for bridge deck pavement in negative bending area, and it should be firmly connected with the flange slab of beam roof.
7. Reinforcement of main girder and hanging girder in positive bending moment zone
The method is to cut off the original bridge deck pavement and linoleum, to wool the original bridge deck, add a layer of steel mesh with anchor rod in the thickness range of the original pavement, and then pour compensatory shortened self-waterproof concrete. To make the structure reach the purpose of crack resistance and seepage control, that is, to deal with waterproofing problems.
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