CN220225930U - Prestressed conversion beam - Google Patents
Prestressed conversion beam Download PDFInfo
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- CN220225930U CN220225930U CN202321454624.1U CN202321454624U CN220225930U CN 220225930 U CN220225930 U CN 220225930U CN 202321454624 U CN202321454624 U CN 202321454624U CN 220225930 U CN220225930 U CN 220225930U
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- prestress
- main body
- conversion beam
- prestressed
- conversion
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 63
- 210000002435 tendon Anatomy 0.000 claims abstract description 36
- 238000012546 transfer Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 238000004873 anchoring Methods 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000010276 construction Methods 0.000 description 9
- 239000011150 reinforced concrete Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a prestress conversion beam, which comprises a conversion beam main body and a connecting beam; a plurality of groups of first prestress units are arranged in the conversion beam main body, each group of first prestress units comprises 2-4 bundles of first prestress ribs, and each bundle of first prestress ribs is in a parabolic structure; the conversion beam main body and the connecting beam are internally provided with a plurality of groups of second prestress units which are arranged in rows, each group of second prestress units comprises 2-4 bundles of second prestress ribs, and each second prestress rib comprises a straight line section and a parabolic line section. According to the utility model, the first prestressed tendons are arranged in the conversion beam main body, and the straight line + parabola + straight line second prestressed tendons are arranged in the connecting beam and the conversion beam main body, so that the combined linear prestressed conversion beam is formed, the prestress loss of the multi-span combined linear prestressed tendons is basically similar to that of a single span, the deflection of the middle large-span conversion beam main body is improved, and the problems that the supports at the two ends of the large-span conversion beam main body are easy to crack, stress overrun and the like are solved.
Description
Technical Field
The utility model relates to the field of buildings, in particular to a prestress conversion beam.
Background
The prestressed tendons in the existing prestressed beams are mostly single straight lines, broken lines or parabolas, are matched with the continuous Liang Wanju direction in each span column distance, can meet the related requirements of deflection limit values of the large-span beams under the load effect in general, and are mostly used for large-span room roofs or floors of exhibition halls, sports grounds and the like which need internal pumping columns.
In addition, compared with the prestressed beam, the conventional support column conversion layer has the defects of large dead weight, poor crack resistance, high engineering investment and the like because the steel reinforced concrete beam is generally adopted as the conversion beam. In actual engineering, the deflection of the conversion beam is larger, and because the load received at the beam end of the conversion beam is larger, the hogging moment of the beam end and the crack at the corresponding support are overlarge, and the condition of stress overrun can also occur, so that potential safety hazard exists.
In conclusion, how to solve the problems that the deflection of the existing large-span conversion beam is large, cracks and stress overrun occur easily in a beam end support of the conversion beam are critical to the construction engineering.
Disclosure of Invention
In view of the above, the utility model provides a prestressed conversion beam, which combines the prestressing technology, improves the deflection of a middle large-span conversion beam main body, and solves the problems that the supports at the two ends of the large-span conversion beam main body are easy to crack, overstretch the stress and the like.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the prestress conversion beam comprises a conversion beam main body and connecting beams arranged on two sides of the conversion beam main body; a plurality of groups of first prestress units are arranged in the conversion beam main body, each group of first prestress units comprises 2-4 bundles of first prestress ribs, and each bundle of first prestress ribs is in a parabolic structure;
the conversion beam main body and the connecting beam are internally provided with a plurality of groups of second prestress units which are distributed in a row mode, each group of second prestress units comprises 2-4 bundles of second prestress ribs, and each second prestress rib comprises a straight line section positioned in the connecting beam and a parabolic line section positioned in the conversion beam.
In the preferred embodiment of the utility model, the straight line section of the second prestress rib is of an inclined straight line structure, and the distance between the anchoring end of the straight line section and the top of the connecting beam is 350-700 mm; the distance between the other end of the straight line segment and the top of the connecting beam is 100-300 mm.
The distance between the lowest point of the first prestressed tendon and the bottom of the main body of the conversion beam is 100-300 mm, and the distance between the anchoring end of the first prestressed tendon and the top of the main body of the conversion beam is 300-1000 mm; the distance between the lowest point of the second prestress rib and the bottom of the conversion beam main body is 350-500 mm.
In a preferred embodiment of the present utility model, the first tendon and the second tendon are both steel strands. Wherein, the steel strand is preferably a 1X 7 standard steel strand, and the nominal diameter of each steel strand is 9.5-21.6 mm.
Compared with the prior art, the utility model has the advantages that:
according to the utility model, a first prestress rib which is parabolic is arranged in a conversion beam main body, a cross-connecting beam is respectively poured at the beam end of the conversion beam main body, and a second prestress rib which is linear, parabolic and linear is arranged in the connecting beam and the conversion beam main body, so that a combined linear prestress conversion beam is formed. The prestress loss of the multi-span combined linear prestress rib is basically similar to that of a single span, so that bending moment can be transmitted more effectively when the distance between the tensioning end and the top and the bottom of the beam is controlled, the strength of the prestress rib is fully utilized, the deflection of a middle large-span conversion beam main body is improved, and the problems that crack and stress overrun are easy to occur to supports at two ends of the large-span conversion beam main body are solved. Compared with a steel reinforced concrete beam, the prestressed conversion beam is more economical, reduces engineering cost and improves construction quality.
Drawings
Fig. 1 is a schematic structural view of the prestressed transfer girder of the present utility model.
Fig. 2 is a top view of fig. 1.
Detailed Description
The following describes embodiments of the present utility model in detail with reference to the accompanying drawings, and the embodiments and specific operation procedures are given by the embodiments of the present utility model under the premise of the technical solution of the present utility model, but the scope of protection of the present utility model is not limited to the following embodiments.
In the description of the present utility model, the terms "coupled," "connected," and "connected," as may be used broadly, and may be connected, for example, fixedly, detachably, or integrally, unless otherwise specifically defined and limited; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art in specific cases.
As shown in fig. 1-2, the prestressed transfer beam of the present utility model includes a transfer beam body 1 and connection beams 2 disposed at both sides of the transfer beam body 1; a plurality of first prestress units are arranged in the conversion beam main body 1, each first prestress unit comprises 2-4 bundles of first prestress ribs 3, two ends of each first prestress rib 3 are respectively anchored on first support columns 4 at two ends of the conversion beam main body 1, and each first prestress rib 3 is of a parabolic structure with an upper opening (the middle part is low, and the two ends are equal in height); the conversion beam main body 1 and the connecting beam 2 are internally provided with a plurality of groups of second prestress units which are arranged in a row, each group of second prestress units comprises 2-4 bundles of second prestress ribs 5, each bundle of second prestress ribs 5 comprises a parabolic section 5.1 (the bottom of the middle part is equal in height at the two ends) positioned in the conversion beam main body 1 and a straight line section 5.2 positioned in each span of the connecting beam 2, and the straight line sections are obliquely arranged to ensure the forming effect of the parabolic section.
In actual construction, the first prestressed tendons 3 and the second prestressed tendons 5 are 1X 7 standard steel strands, and the nominal diameter of each strand of steel strands is 9.5-21.6 mm. As can be seen in connection with fig. 1, the anchoring end of the first tendon 3Distance L from the top of the transfer beam body 1 1 300-1000 mm; distance L between the lowest part of the first tendon 3 and the bottom surface of the main body 1 of the transfer beam 1 100-300 mm; the distance between the anchoring end of the straight line section 5.2 of the second prestressed reinforcement 5 and the top of the connecting beam 2L 3 350-700 mm; distance L between the other end of straight line segment 5.2 and the top of connecting beam 2 4 100-300 mm; distance L between the lowest point of the second tendon 5 and the bottom of the transfer beam body 1 5 The length of the parabola section 5.1 of the second prestressed tendon 5 is 350-500 mm, namely, the parabola section 5.1 of the second prestressed tendon 5 is positioned above the first prestressed tendon 3, so that the construction is prevented from being influenced by crossing.
The construction process of the prestress conversion beam provided by the utility model comprises the following steps:
firstly, determining the span of the main body 1 of the conversion beam, and anchoring 2-4 bundles of first prestressed tendons 3 between each pair of first support columns 4 of the span of the main body 1 of the conversion beam;
secondly, arranging second prestressed tendons 5 (namely anchoring 2-4 bundles of second prestressed tendons 5 between each pair of second towing columns 6) in a span range extending from left to right of the conversion beam main body 1;
thirdly, according to design requirements, the line shapes of the first prestressed tendons 3 and the second prestressed tendons 5 are adjusted, and the distance between the anchoring end of the first prestressed tendons 3 and the top of the main body 1 of the conversion beamL 1 300-1000 mm; the first prestressed tendon 3 has a parabolic structure, and the distance L between the lowest point and the bottom surface of the main body 1 of the conversion beam 1 100-300 mm;
the second prestressed tendon 5 is of a straight line, parabolic line and straight line structure, and the distance L between the anchoring end of the straight line segment and the top of the connecting beam 2 is equal to 3 350-700 mm; distance L between the other end of the straight line segment and the top of the connecting beam 2 4 100-300 mm; distance L between the lowest point of the second tendon 5 and the bottom of the transfer beam body 1 5 350-500 mm, and the parabolic section of the second tendon 5 is positioned above the first tendon 3;
and fourthly, pouring concrete according to a conventional construction method, tensioning the prestressed tendons by adopting a post-tensioning method, sealing anchors, and finishing the construction of the multi-span combined linear prestressed conversion beam.
The load that beam end department received of traditional conversion roof beam is great, leads to the hogging moment of beam end and corresponds the crack of support department all too big, still probably appears the condition of stress overrun. Therefore, the first prestress rib 3 with a parabolic structure is arranged in the conversion beam main body 1, a span connecting beam 2 is respectively poured at two sides of the conversion beam main body 1, and the second prestress rib 5 with a linear structure of linear, parabolic and linear is arranged in the connecting beam 2 and the conversion beam main body 1 to form a double-layer combined linear prestress conversion beam, and the prestress loss of the multi-span combined linear prestress rib is basically similar to that of a single span, so that the distance between the tensioning end and the top and bottom of the beam is controlled, the bending moment can be transmitted more effectively, the prestress rib strength is fully utilized, the deflection of the conversion beam main body 1 with a large span in the middle part is improved, and the problems that the supports at two ends of the conversion beam main body 1 with the large span are easy to crack, the stress overrun and the like are solved. Compared with a steel reinforced concrete beam, the prestressed conversion beam is more economical, reduces engineering cost and improves construction quality.
The second prestressed tendons 5 are arranged in the connecting beam 2 and the converting beam main body 1, so that the mode that different bridge bodies are respectively overlapped by the prestressed tendons is avoided, the problem that the prestressed tendons cannot be constructed due to conflict on the upper part of the support is solved, the construction problems that the spacing of the pore canals is unreasonable in short distance, the prestressed tendons are difficult to stretch and the like are solved, and meanwhile, the effect of the prestressed force can be fully utilized by the reinforced concrete beam, and the safety of the structure is ensured.
It should be emphasized that the above description is merely a preferred embodiment of the present utility model, and the present utility model is not limited to the above embodiment, but may be modified without inventive effort or equivalent substitution of some of the technical features described in the above embodiments by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (4)
1. A prestressed transfer beam, comprising a transfer beam body, characterized in that: the connecting beams are arranged on two sides of the conversion beam main body; a plurality of groups of first prestress units are arranged in the conversion beam main body, each group of first prestress units comprises 2-4 bundles of first prestress ribs, and each bundle of first prestress ribs is in a parabolic structure;
the conversion beam main body and the connecting beam are internally provided with a plurality of groups of second prestress units which are arranged in a row, each group of second prestress units comprises 2-4 bundles of second prestress ribs, and each second prestress rib comprises a straight line section positioned in the connecting beam and a parabolic line section positioned in the conversion beam.
2. The prestressed transfer beam of claim 1, wherein: the straight line section of the second prestress rib is of an inclined straight line structure, and the distance between the anchoring end of the straight line section and the top of the connecting beam is 350-700 mm; the distance between the other end of the straight line segment and the top of the connecting beam is 100-300 mm.
3. The prestressed transfer beam of claim 1, wherein: the distance between the lowest point of the first prestressed tendon and the bottom of the main body of the conversion beam is 100-300 mm, and the distance between the anchoring end of the first prestressed tendon and the top of the main body of the conversion beam is 300-1000 mm; the distance between the lowest point of the second prestress rib and the bottom of the conversion beam main body is 350-500 mm.
4. The prestressed transfer beam of claim 1, wherein: the first prestressed tendons and the second prestressed tendons are steel stranded wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321454624.1U CN220225930U (en) | 2023-06-08 | 2023-06-08 | Prestressed conversion beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321454624.1U CN220225930U (en) | 2023-06-08 | 2023-06-08 | Prestressed conversion beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220225930U true CN220225930U (en) | 2023-12-22 |
Family
ID=89193362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321454624.1U Active CN220225930U (en) | 2023-06-08 | 2023-06-08 | Prestressed conversion beam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220225930U (en) |
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2023
- 2023-06-08 CN CN202321454624.1U patent/CN220225930U/en active Active
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