A Method of Prestressing the Concrete Slab of the Upper Flange of the Composite Beam
A concrete slab and pressure-applying technology, which is applied to bridges, bridge materials, bridge construction, etc., can solve problems such as low efficiency, increased prestress loss, and poor prestress application effect, and achieve convenient construction, less prestress loss, and The effect of good promotion prospects
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Embodiment 1
[0038] Such as Figures 1 to 5 As shown in one of the above, the method of this embodiment can replace the construction method of applying prestress to the composite beam concrete slab by the prestressed tendons. And carry out maintenance treatment, then reserve the concrete slab connecting segment 1 near the junction of the positive bending moment area and the negative bending moment area, and set the jack 3 and the steel guide beam at intervals at the reserved concrete slab connecting segment 1, and pass through The jack 3 exerts preload on the concrete slab in the negative bending moment area, and then installs the formwork and binding steel bars of the reserved concrete slab connecting section 1 in the area where the jack 3 is not installed in the reserved concrete slab connecting section 1, and then performs pre-loading. For the pouring and maintenance of the concrete slab 6 in the connecting section, when the strength of the concrete reaches more than 90%, part of the ja...
Embodiment 2
[0052] Such as Figures 6 to 10 As shown in one of the above, the method of this embodiment and the method of Embodiment 1 and the corresponding pictorial labels are roughly the same, the difference is that the concrete bridge deck 4 of this embodiment is a cast-in-place concrete slab, after the concrete bridge deck 4 is cast-in-place and cured , and then refer to the steps of Example 1 to apply pre-pressure and connect the rest of the parts into a whole.
[0053] The present invention adopts the above-mentioned technical scheme, and its advantage is that the construction is simple, and the concrete slab can be directly pressed by a jack to generate pre-pressure on the concrete bridge deck, and the pre-pressure can be maintained through the cast-in-place reserved concrete slab connection section. It avoids the traditional method of setting prestressed steel bars that consumes a lot of manpower and material resources, and finally reduces the engineering cost and better ensures ...
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