阅读说明：本技术 一种千斤顶式波形钢腹板预应力组合梁 (Jack type corrugated steel web prestress composite beam ) 是由 万水 黄牧允 李朝军 袁峰 张钰伯 于 2020-04-29 设计创作，主要内容包括：本发明公开了一种千斤顶式波形钢腹板预应力组合梁,涉及桥梁施工技术领域,所述组合梁包括混凝土顶板、混凝土底板及混凝土顶板与混凝土底板之间设有的钢梁,所述钢梁包括上翼缘平钢板、下翼缘平钢板及上翼缘平钢板与下翼缘平钢板之间设有的波形钢腹板,所述钢梁宽度方向两侧均设有带孔肋板、预应力筋、预应力筋锚固装置及千斤顶装置。本发明通过波形钢腹板上设置的千斤顶装置向预应力筋施加荷载,可以实时调节组合梁结构的预应力水平并针对使用过程中的预应力损失做出有效的弥补,施工较为方便,结构的耐久性得到提高。(The invention discloses a jack type corrugated steel web prestressed composite beam, which relates to the technical field of bridge construction. According to the invention, the jack device arranged on the corrugated steel web plate applies load to the prestressed tendons, so that the prestress level of the composite beam structure can be adjusted in real time, the prestress loss in the using process is effectively compensated, the construction is more convenient, and the durability of the structure is improved.)

1. The jack type corrugated steel web prestress composite beam is characterized by comprising a concrete top plate (1), a concrete bottom plate (2) and a steel beam arranged between the concrete top plate (1) and the concrete bottom plate (2), wherein the steel beam comprises an upper flange flat steel plate (8), a lower flange flat steel plate (9) and a corrugated steel web (3) arranged between the upper flange flat steel plate (8) and the lower flange flat steel plate (9), and two sides of the steel beam in the width direction are provided with a perforated rib plate (4), a prestressed rib (5), a prestressed rib anchoring device (7) and a jack device (6).

2. The jack-type corrugated steel web prestressed composite girder according to claim 1, wherein: corrugated steel web (3) quantity in the girder steel is a set of and follows girder steel width direction symmetric distribution is between last flange plain steel board (8) and lower flange plain steel board (9), foraminiferous floor (4) quantity of girder steel width direction both sides is two sets of and all follows girder steel length direction symmetric distribution is located it does not be equipped with to divide equally between foraminiferous floor (4) of girder steel length direction both sides jack device (6), prestressing tendons anchor device (7) quantity of girder steel width direction both sides is a set of and all follows girder steel length direction symmetric distribution, prestressing tendons (5) pass in proper order foraminiferous floor (4) set up.

3. The jack-type corrugated steel web prestressed composite girder according to claim 2, wherein: holes for the prestressed tendons (5) to pass through and bolt holes for installing the jack devices (6) are formed in the ribbed plates (4) with the holes.

4. The jack-type corrugated steel web prestressed composite girder according to claim 2, wherein: the prestressed rib anchoring device (7) comprises an outer shell (703), a group of longitudinal stiffening plates (702) which are fixedly arranged in the outer shell (703) at intervals in parallel, a bearing plate (701) which is arranged between the longitudinal stiffening plates (702), a base plate (502) which is arranged on the bearing plate (701) and an anchorage device (501).

5. The jack-type corrugated steel web prestressed composite girder according to claim 2, wherein: the jack device (6) comprises a group of connecting plates (603), connecting bolts (604), jacks (601) arranged among the connecting plates (603) and conversion heads (602) connected with the jacks (601).

6. The jack-type corrugated steel web prestressed composite girder according to claim 5, wherein: the connecting plate (603) is a pi-shaped connecting plate.

7. The jack-type corrugated steel web prestressed composite girder according to claim 2, wherein: the prestressed tendons (5) are stranded wires woven by carbon fiber reinforced composite materials.

8. The jack-type corrugated steel web prestressed composite girder according to claim 2, wherein: the prestressed tendons (5) are high-strength steel strands.

9. The jack-type corrugated steel web prestressed composite girder according to claim 7 or 8, wherein: the prestressed tendons (5) are externally provided with protective coatings.

10. The jack-type corrugated steel web prestressed composite girder according to claim 7 or 8, wherein: and a protective sleeve is arranged outside the prestressed tendon (5).

Technical Field

The invention relates to the technical field of bridge construction, in particular to a jack type corrugated steel web prestress composite beam.

Background

The traditional prestressed composite beam mostly adopts the combination of a flat steel web and a concrete slab or the combination of a corrugated steel web and concrete. Due to the corrugated steel plate, the corrugated steel plate can deform along the longitudinal bridge direction, so that the resistance of the web rigidity to the prestress can be effectively reduced when the prestress is applied, and the utilization rate of the prestress is improved.

The external prestressing system is widely used in corrugated steel web composite beams and is one of the important methods for applying prestressing force. However, the external prestress is transmitted to the concrete only by a special device and an anchoring device, the deformation is inconsistent, once the anchoring device or a steering device is damaged, the loss and even the failure of the prestress are easily caused, and the effective mode is difficult to be adopted for remediation, so that the structural durability is reduced, and the service life is shortened.

Therefore, a new solution is now needed.

Disclosure of Invention

In order to solve the problems, the invention discloses a jack type corrugated steel web prestressed composite beam, which improves the problems of an external prestressed system of the existing corrugated steel web composite beam and improves the application flexibility of the prestressed system by improving the prestressed application mode of the traditional prestressed composite beam.

In order to achieve the above purpose, the invention provides the following technical scheme: the jack type corrugated steel web prestressed composite beam comprises a concrete top plate, a concrete bottom plate and a steel beam arranged between the concrete top plate and the concrete bottom plate, wherein the steel beam comprises an upper flange flat steel plate, a lower flange flat steel plate and a corrugated steel web arranged between the upper flange flat steel plate and the lower flange flat steel plate, and perforated rib plates, prestressed ribs, prestressed rib anchoring devices and jack devices are arranged on two sides of the steel beam in the width direction. The number of steel beams in the combined beam is one group and is symmetrically distributed along the width direction of the combined beam.

As an improvement of the invention, the number of the corrugated steel webs in the steel beam is one group and is symmetrically distributed between the upper flange flat steel plate and the lower flange flat steel plate along the width direction of the steel beam, the number of the perforated rib plates on two sides of the width direction of the steel beam is two groups and is symmetrically distributed along the length direction of the steel beam, the jack devices are respectively arranged between the perforated rib plates on two sides of the length direction of the steel beam, the number of the prestressed rib anchoring devices on two sides of the width direction of the steel beam is one group and is symmetrically distributed along the length direction of the steel beam, and the prestressed ribs sequentially penetrate through the perforated rib plates.

As an improvement of the invention, holes for the prestressed tendons to pass through and bolt holes required for mounting the jack device are formed in the ribbed plates with the holes.

As an improvement of the invention, the prestressed tendon anchoring device comprises a shell, a group of longitudinal stiffening plates fixedly arranged in the shell at intervals in parallel, a bearing plate arranged between the longitudinal stiffening plates, and a base plate and an anchorage device arranged on the bearing plate. The end part of the prestressed tendon is anchored on the bearing plate through an anchorage device and a backing plate.

As an improvement of the invention, the jack device comprises a group of connecting plates, connecting bolts, jacks arranged between the connecting plates and conversion heads connected with the jacks. The jack is welded with the connecting plate, and the connecting plate and the ribbed plate with the hole are positioned and fixed through the connecting bolt.

As an improvement of the invention, the connecting plate is a pi-shaped connecting plate.

As an improvement of the invention, the prestressed tendons are stranded wires woven by carbon fiber reinforced composite materials.

As an improvement of the invention, the prestressed tendons are high-strength steel strands.

As a modification of the invention, the tendon has a protective coating on the outside.

As a modification of the invention, the prestressed tendon is externally provided with a protective sleeve.

Compared with the prior art, the invention has the following advantages: the jack device is used for applying the prestress of the structure, so that a concrete turning block is not required to be poured, the prestress level can be gradually applied by the jack device during the structure construction, and the prestress can be adjusted in real time according to the structure condition by the jack device during the structure use process.

Drawings

FIG. 1 is a schematic view of the overall structure of a jack type corrugated steel web prestressed composite beam according to the present invention;

FIG. 2 is a schematic view of the steel beam;

FIG. 3 is a schematic structural view of the jack device;

fig. 4 is a schematic structural view of the prestressed tendon anchoring device;

list of reference numerals: 1. a concrete top plate; 2. a concrete floor; 3. a corrugated steel web; 4. a ribbed plate with holes; 5. prestressed tendons; 501. an anchorage device; 502. a base plate; 6. a jack device; 601. a jack; 602. a conversion head; 603. a connecting plate; 604. a connecting bolt; 7. a prestressed rib anchoring device; 701. a pressure bearing plate; 702. longitudinal stiffening plates; 703. a housing; 8. an upper flange flat steel plate; 9. a lower flange flat steel plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, 2 and 3, prefabrication of steel beams in the jack type corrugated steel web prestress composite beam is performed in a factory, wherein the steel beams comprise an upper flange flat steel plate 8, a lower flange flat steel plate 9 and a corrugated steel web 3 arranged between the upper flange flat steel plate 8 and the lower flange flat steel plate 9. For each steel beam, two corrugated steel webs 3 are symmetrically distributed between an upper flange flat steel plate 8 and a lower flange flat steel plate 9 of the steel beam. The perforated rib plate 4 is provided with holes for the prestressed tendons 5 to pass through and bolt holes required for installing the jack devices 6, the perforated rib plate 4 is arranged at the turning position of the prestressed tendons 5, and the connecting bolt 604 realizes the positioning and fixing of the connecting plate 603 and the perforated rib plate 4.

Referring to fig. 1, 2 and 4, each tendon 5 passes through the reserved opening on the corresponding perforated rib plate 4 along the length direction of the composite beam according to a fold line shape and a straight line shape, and is anchored on the bearing plate 701 through an anchorage 501 and a backing plate 502.

Referring to fig. 1, 2 and 3, after the steel beams are prefabricated in a factory, the steel beams are transported to a construction site, a construction mold is erected, reinforcing steel bars are bound, pouring and later-period maintenance of the concrete top plate 1 and the concrete bottom plate 2 are completed, meanwhile, the corresponding positions between the ribbed plates with holes are positioned, the jack devices 6 are installed, the jack devices 6 apply force to the prestressed reinforcing steel bars, and the real-time adjustment of the prestress level can be achieved.

The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.