CN109440634B - Prefabricated high-strength concrete hollow bent cap structure with removable internal mold - Google Patents
Prefabricated high-strength concrete hollow bent cap structure with removable internal mold Download PDFInfo
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- CN109440634B CN109440634B CN201811507760.6A CN201811507760A CN109440634B CN 109440634 B CN109440634 B CN 109440634B CN 201811507760 A CN201811507760 A CN 201811507760A CN 109440634 B CN109440634 B CN 109440634B
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- bent cap
- bottom plate
- prefabricated
- upward opening
- bent
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- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 20
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 238000005336 cracking Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 21
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 1
- 239000013585 weight reducing agent Substances 0.000 abstract 1
- 238000009417 prefabrication Methods 0.000 description 6
- 238000011065 in-situ storage Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 210000002435 tendon Anatomy 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011513 prestressed concrete Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
Abstract
The invention discloses a prefabricated high-strength concrete hollow bent cap structure with an internal mold capable of being taken out, which comprises a bent cap bottom plate, a cavity with an upward opening, bottom plate round holes and a bent cap web, wherein the bent cap bottom plate is provided with a plurality of cavities with the upward opening which are distributed at intervals, the bent cap bottom plate is provided with a plurality of bottom plate round holes which are distributed at intervals, the bottom plate round holes are communicated with the cavities with the upward opening, two end parts of the bent cap bottom plate are provided with bent cap end solid areas, the bent cap bottom plate is provided with a bent cap pier top solid area, and the front part and the rear part of the bent cap bottom plate are respectively provided with a bent cap web. The invention has the beneficial effects that: according to the invention, the integral prefabricated assembly structure is adopted for the bent cap, so that the influence of construction on the environment is reduced, compared with the bent cap which is prefabricated and assembled in a segmented mode, the bent cap disclosed by the invention has the advantages of better integral performance, better stress performance, weight reduction of approximately 25-30% compared with the traditional solid section bent cap, capability of taking out and recycling the inner die, convenience in construction and great economic benefit.
Description
Technical Field
The invention relates to the technical field of prefabricated assembled bridge construction, in particular to a prefabricated high-strength concrete hollow bent cap structure with an internal mold capable of being taken out.
Background
At present, the concept of bridge prefabrication and assembly is expanding from an upper structure to a lower structure, and the bridge prefabrication and assembly direction is rapidly developed. The range of the prefabricated component gradually covers the girder, the bridge pier, the bridge abutment, the foundation, the anti-collision wall, the capping beam and the like. The full-prefabricated construction process has been adopted in European and Japanese countries more and more due to the characteristics of convenient and rapid construction, stable and reliable quality, small influence on traffic and environment, etc. Urban overhead bridges are limited by the form of ground auxiliary road sections, sometimes requiring the use of large cantilever prestressed concrete cap beams. The available space under the large cantilever prestressed concrete bent cap bridge is obviously increased, the transverse crossing capacity of the bridge is larger, and the cross section size of the bent cap can be made lighter, so that the bent cap is widely applied to the existing urban viaduct, accords with the aesthetic sense of masses, and has wide application prospect.
Because the general body volume of bent cap is great, if adopt prefabrication then put forward very high requirement to transportation and hoist and mount. Therefore, the capping beam is generally constructed by adopting a cast-in-situ method, which not only needs to set up and dismantle the bearing bracket to carry out dangerous aloft work, but also severely restricts the construction progress. With the development of large-scale transportation, hoisting equipment and new materials, a foundation is provided for industrial upgrading, and the prefabrication of the bent cap is possible. However, the prior art is mainly based on a segmented prefabrication method, so that a splicing seam becomes a key structure affecting the stress performance of the bent cap. For the most common big cantilever bent cap of double column formula, splice seam setting is when dividing into two sections with the bent cap in the middle, can guarantee that the seam atress is less, but needs to set up the wet seam of certain width between the festival section, needs temporary support when the scene concatenation, and the construction is comparatively loaded down with trivial details. When the spliced seam is arranged on the outer side of the pier stud and divides the capping beam into three sections, wet seams and on-site temporary supports are not needed, but the stress of the spliced seam is large, and the whole stress performance of the capping beam is unfavorable. When the vertical layering divides the capping beam into a lower prefabricated part and an upper cast-in-situ part, the capping beam has better integrity, but the problem of processing the joint surface of the prefabricated part and the cast-in-situ part exists, and a large amount of concrete needs to be poured on site. Therefore, the integrally prefabricated capping beam has the best integrity, and is obviously superior to the segmented prefabricated capping beam from the aspects of convenient construction and stress performance. However, the bent cap adopting the traditional solid section design is heavy in weight, special transportation and hoisting equipment which are required to be input are high in cost, and the internal mold of the bent cap adopting the box section design cannot be taken out and reused, so that the economic performance of the whole prefabricated bent cap is seriously influenced. In summary, the weight and cross-sectional type of the capping beam are generally critical to whether and how the prefabricated assembly scheme can be implemented. If the dead weight of the bent cap can be reduced, the internal mold can be taken out, the whole prefabrication of the bent cap can be realized, good economic benefits can be generated, the stress performance of the bent cap is optimized, and the construction is convenient.
Therefore, those skilled in the art are highly required to develop a lightweight capping beam structure which is integrally prefabricated, meets the design requirements and is convenient to construct.
Those skilled in the art are directed to solving the above-mentioned technical drawbacks.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is directed to providing a prefabricated high-strength concrete hollow capping beam structure with a removable inner mold.
In order to achieve the technical aim, the invention provides a prefabricated high-strength concrete hollow bent cap structure with an internal mold capable of being taken out, which comprises a bent cap bottom plate, a cavity with an upward opening, bottom plate round holes and a bent cap web, wherein the bent cap bottom plate is provided with a plurality of cavities with the upward opening which are distributed at intervals, the bent cap bottom plate is provided with a plurality of bottom plate round holes which are distributed at intervals, the bottom plate round holes are communicated with the cavities with the upward opening, both ends of the bent cap bottom plate are provided with bent cap end solid areas, the bent cap bottom plate is provided with a bent cap pier top solid area, the top of the bent cap pier top solid area is provided with an upper structure support, and the front part and the rear part of the bent cap bottom plate are provided with bent cap webs; the internal cavity is provided with a surface layer anti-cracking reinforcing steel mesh, and the capping beam at the position of the support and the pier top is a solid section.
Further, deep-buried anchors are arranged at the two ends of the roof of the bent cap; and prestressed tendons are connected between two adjacent deep-buried anchors.
The invention has the beneficial effects that:
the invention adopts the integral prefabricated assembled structure of the bent cap, compared with a cast-in-situ structure, reduces the field construction period and reduces the influence of construction on the environment. Compared with the bent cap which is prefabricated and assembled in a sectional mode, the bent cap of the scheme has better overall performance and better stress performance, the weight of the bent cap is reduced by approximately 25% -30% compared with that of the conventional bent cap with a solid section, the use of large engineering tools is reduced during on-site assembly construction, the difficulty of on-site assembly construction is reduced, the on-site construction measure cost is saved, the damage to the road surface along the line caused by the overweight weight of the bent cap in the process of transferring the bent cap is reduced, and the internal mold can be taken out and reused in the two schemes, so that the economic performance of the prefabricated hollow bent cap is greatly improved.
Drawings
FIG. 1 is a construction view of embodiment 1 of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic diagram showing the arrangement of prestressed reinforcement in example 1;
FIG. 4 is a construction view of embodiment 2 of the present invention;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;
fig. 6 is a schematic diagram showing the arrangement of prestressed reinforcement in example 2.
The marks in the figure: 1. the bottom plate round hole, 2, the cavity that the opening was up, 3, the solid district in bent cap tip, 4, superstructure support, 5, bent cap web, 6, bent cap bottom plate, 7, prestressing tendons, 8, buried ground tackle deeply, 9, bent cap roof, 10, middle diaphragm, 11, bent cap mound top solid district, 12, the cavity that the opening is down.
Detailed Description
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
As shown in fig. 1 and 2-6, the prefabricated high-strength concrete hollow bent cap structure with the removable internal mold comprises a bent cap bottom plate 6, a cavity 2 with an upward opening, a bottom plate round hole 1 and a bent cap web 5, wherein the bent cap bottom plate 6 is provided with the cavity 2 with the upward opening and distributed at multiple intervals, the bent cap bottom plate 6 is provided with a plurality of bottom plate round holes 1 which are distributed at multiple intervals, the bottom plate round holes 1 are communicated with the cavity 2 with the upward opening, two end parts of the bent cap bottom plate 6 are provided with bent cap end part solid areas 3, the bent cap bottom plate 6 is provided with a bent cap pier top solid area 11, the top of the bent cap pier top solid area 11 is provided with an upper structure support 4, and the front part and the rear part of the bent cap bottom plate 6 are provided with the bent cap web 5.
Further, the novel structure comprises a capping beam top plate 9, wherein a plurality of cavities 12 with downward openings are arranged on the capping beam top plate 9 at intervals, and a plurality of upper structure supports 4 are arranged at the upper end of the capping beam top plate 9.
The two ends of the capping beam top plate 9 are provided with deep-buried anchors 8, and prestressed tendons 7 are connected between two adjacent deep-buried anchors 8.
Furthermore, an intermediate diaphragm plate 10 is arranged between adjacent cavities 12 with the openings facing downwards.
The invention adopts the integral prefabricated assembled structure of the bent cap, compared with a cast-in-situ structure, reduces the field construction period and reduces the influence of construction on the environment. Compared with the bent cap which is prefabricated and assembled in a sectional mode, the bent cap of the scheme has better overall performance and better stress performance, and the calculation shows that the weight of the bent cap of the technical scheme is reduced by nearly 25-30% compared with that of the conventional bent cap of the solid section. The use of large engineering tools is reduced during site assembly construction, the difficulty of site assembly construction is reduced, the site construction measure cost is saved, the damage to the road surface along the line caused by the overweight of the bent cap in the process of transferring the bent cap is reduced, meanwhile, the internal mold can be taken out and recycled in both schemes, and the economic performance of the prefabricated hollow bent cap is greatly improved.
As shown in fig. 1, in example 1 of this patent, a prefabricated high-strength concrete hollow capping beam with an upward opening is proposed, and in this embodiment, the upper structure span of the bridge is 30-35 m, and the bridge width is 23-26 m. The inner cavity with the upward opening is formed by utilizing the inner steel template, the bottom of the steel template is provided with a round hole reserved on the bottom plate of the bent cap, so that the inner die is convenient to fix, the inner die is prevented from floating upwards when concrete is poured, and reinforcing steel bars are additionally arranged near the round hole on the bottom plate to prevent local stress concentration. The surface layer anti-cracking reinforcing steel bar meshes are arranged in the inner cavity, the support and the pier top are positioned, the capping beam is still of a solid section, the capping beam is conveniently connected with the pier column through the grouting sleeve, the inner steel forms are taken out after the capping beam reaches a certain age, the prestress is vertically distributed in three rows in total, the prestress is stretched in two batches, and the two ends of the prestress are deeply buried with anchors.
As shown in fig. 4, example 2 of this patent proposes a prefabricated high-strength concrete hollow capping beam with its opening facing downward.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (1)
1. The prefabricated high-strength concrete hollow bent cap structure that centre form can take out, its characterized in that: the novel bent cap comprises a bent cap bottom plate (6), a cavity (2) with an upward opening, a bottom plate round hole (1) and a bent cap web (5), wherein the bent cap bottom plate (6) is provided with a plurality of cavities (2) with the upward opening which are distributed at intervals, the bent cap bottom plate (6) is provided with a plurality of bottom plate round holes (1) which are distributed at intervals, the bottom plate round holes (1) are communicated with the cavities (2) with the upward opening, two end parts of the bent cap bottom plate (6) are provided with bent cap end solid areas (3), the bent cap bottom plate (6) is provided with a bent cap pier top solid area (11), the top of the bent cap pier top solid area (11) is provided with an upper structure support (4), and the front part and the rear part of the bent cap bottom plate (6) are provided with bent cap webs (5); the internal cavity is provided with a surface layer anti-cracking reinforcing steel mesh, and the capping beam at the position of the support and the pier top is a solid section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507760.6A CN109440634B (en) | 2018-12-11 | 2018-12-11 | Prefabricated high-strength concrete hollow bent cap structure with removable internal mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507760.6A CN109440634B (en) | 2018-12-11 | 2018-12-11 | Prefabricated high-strength concrete hollow bent cap structure with removable internal mold |
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| Publication Number | Publication Date |
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| CN109440634A CN109440634A (en) | 2019-03-08 |
| CN109440634B true CN109440634B (en) | 2024-02-06 |
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| CN201811507760.6A Active CN109440634B (en) | 2018-12-11 | 2018-12-11 | Prefabricated high-strength concrete hollow bent cap structure with removable internal mold |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109811642B (en) * | 2019-03-12 | 2024-03-12 | 上海市城市建设设计研究总院（集团）有限公司 | Assembled prefabricated assembled bent cap structure and construction method thereof |
| CN109868753B (en) * | 2019-04-18 | 2024-03-12 | 上海市城市建设设计研究总院（集团）有限公司 | Prefabricated assembled pier beam consolidation structure and construction method thereof |
| CN109881575B (en) * | 2019-04-18 | 2024-03-12 | 上海市城市建设设计研究总院（集团）有限公司 | Pi-shaped cross section prefabricated bent cap adopting internal prestressed tendons and prefabricating method thereof |
| CN109881574B (en) * | 2019-04-18 | 2024-04-09 | 上海市城市建设设计研究总院（集团）有限公司 | Pi-shaped cross section prefabricated bent cap adopting external prestressed tendons and prefabricating method thereof |
| CN112878181A (en) * | 2021-01-13 | 2021-06-01 | 南京工业大学 | Precast concrete combined bent cap adopting corrugated steel shell and assembling method thereof |
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| CN209619836U (en) * | 2018-12-11 | 2019-11-12 | 上海市城市建设设计研究总院（集团）有限公司 | The prefabricated high strength concrete hollow bent cap structure that internal model can be taken off |
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2018
- 2018-12-11 CN CN201811507760.6A patent/CN109440634B/en active Active
Patent Citations (7)
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| CN109440634A (en) | 2019-03-08 |
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