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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

Active Publication Date: 2020-07-31
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shrinkage and creep of concrete, the prestress loss will increase with the increase of concrete shrinkage and creep, so that most of the prestress is transferred from the concrete slab to the steel beam, resulting in poor prestress application effect of the concrete structure. low efficiency
At the same time, the local stability of the steel beam flanges and webs in compression has the potential to control the design

Method used

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  • A Method of Prestressing the Concrete Slab of the Upper Flange of the Composite Beam
  • A Method of Prestressing the Concrete Slab of the Upper Flange of the Composite Beam
  • A Method of Prestressing the Concrete Slab of the Upper Flange of the Composite Beam

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Experimental program
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Effect test

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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Abstract

The invention discloses a method for applying pre-pressure to concrete boards of a composite beam top flange. The method includes the steps that the concrete boards in a sagging moment area and a hogging moment area of a composite beam are constructed, then, reserved concrete board connecting sections are arranged in the position near the junction of the sagging moment area and the hogging momentarea, jacks are arranged at intervals in the reserved concrete board connecting sections, so that the pre-pressure is applied to the concrete boards in the hogging moment area, the concrete boards areconstructed in the areas, without the jacks, of the reserved concrete board connecting sections, and then after the jacks are detached, the concrete boards are constructed in remaining parts in the reserved concrete board connecting sections. The method in the scheme has the advantages that the building cost of a project is reduced, construction is convenient, pre-pressure losses are few, efficiency is high, and the popularization prospects are good.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a method for applying preload to a concrete slab on the upper flange of a composite beam. Background technique [0002] Prestressed steel-concrete composite girder bridge is a bridge form that combines modern prestressing technology and composite girder bridge. Due to the advantages of high bearing capacity, good ductility and high rigidity, steel-concrete composite beams have been widely used in highways, railways and urban overpasses. However, for ordinary continuous composite girder bridges, the concrete bridge deck in the negative bending moment area of ​​the intermediate support quits work after being pulled and cracked, resulting in a decrease in section stiffness and bearing capacity. After the bridge deck is cracked, it is easy to cause corrosion of the steel bars in the concrete, which affects the durability of the structure. Even if the reinforce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00E01D19/12E01D101/28
CPCE01D19/125E01D21/00E01D2101/28
Inventor 赵秋方向明
Owner FUZHOU UNIV
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