Post-tensioned prestressed double-T beam / plate with cantilever
By using the rear-tension prestressed double T-beam/plate with cantilever in the space structure, and using the rear-tension prestress curve to achieve large cantilever, the problem of cross-section greatly affecting the space height and high cost when the large span is increased in the existing technology is solved, and the span is increased and the cost is reduced.
Patent Information
- Application Number
- CN202421572680.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-04
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-07-04
AI Technical Summary
When the prior art achieves large spans and cantilevers, conventional cast-in-place methods will cause problems such as large-scale impact on the spatial height and high cost of cross-section.
A rear-tension prestressed double T-beam/plate with cantilever is used to achieve large cantilever through the rear-tension prestressed curve, which improves the single-span span. The specific implementation method is that the end height of the rib beam decreases from the inside to the outside, forming a cantilever section with the plate surface. A downwardly curved prestressed beam is provided inside the rib beam. Both ends of the prestressed beam are drawn out from the upper side of the plate surface, and the rib beam and the plate surface are tensioned by the post-tension method.
Through the large cantilever design, the single span span is improved, the impact of cross-sectional area on space height is reduced, and the construction cost is reduced.
Smart Images
Figure CN222759218U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of prefabricated beams, and in particular to a post-tensioned prestressed double T beam / plate with cantilever. Background Art
[0002] Spatial structures usually face the problem of having large spans and large cantilevers. Conventional cast-in-place methods have the problem of large cross-sections that affect spatial height and high costs when achieving large spans and large cantilevers. To this end, the inventor proposed a post-tensioned prestressed double T-beam / slab with cantilever. Utility Model Content
[0003] The purpose of the present application is to propose a post-tensioned double T-beam / slab with cantilever, which can improve the single span by the large cantilever achieved by the post-tensioned curve.
[0004] The embodiment of the present application is implemented as follows:
[0005] The present application provides a post-tensioned double T-beam / plate with a cantilever, comprising an integrally formed plate surface and a rib beam, wherein the height of the end of the rib beam decreases from the inside to the outside, and a cantilever section is formed with the plate surface corresponding to the end, and a downward-bent prestressed bundle tensioned by a post-tensioning method is passed through the interior of the rib beam, and both ends of the prestressed bundle are led out from the upper side of the plate surface.
[0006] The present application uses prestressed tendons to post-tension the rib beams and the slab along the span direction, so that the reinforcement near the top of the slab is extended outward to become cantilevered stress-bearing reinforcement. The large cantilever achieved can increase the span of a single span.
[0007] In an optional embodiment, stirrups extending into the panel surface are provided inside the rib beam.
[0008] In an optional embodiment, the stirrups are provided with positioning ribs for fixing the prestressed tendons.
[0009] In an optional embodiment, both ends of the prestressed bundle pass through the positioning ribs and are arranged parallel to the cantilever section.
[0010] In an optional embodiment, the outer sheath of the prestressed tendon is provided with a bellows.
[0011] In an optional embodiment, the corrugated pipe is pre-embedded in the rib beam and the plate surface.
[0012] In an alternative embodiment, the ribs and the deck have equal longitudinal lengths.
[0013] In an optional embodiment, the ribs are arranged symmetrically at the bottom of the panel.
[0014] In an optional embodiment, reinforcing ribs are provided between the rib beams.
[0015] In an optional embodiment, the reinforcing ribs are arranged perpendicular to the rib beams. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the embodiments described below are only used to explain the present application, rather than to limit the scope of the present application. In the accompanying drawings:
[0017] Figure 1 is a schematic diagram of a post-tensioned prestressed double T-beam / slab with cantilever according to an embodiment of the present application;
[0018] Figure 2 is a cross-sectional view of a post-tensioned prestressed double T-beam / slab with cantilever according to an embodiment of the present application;
[0019] Figure 3 is a schematic diagram of an arrangement curve of a prestressed bundle according to an embodiment of the present application;
[0020] Reference numerals:
[0021] 10. Board surface;
[0022] 20. Rib beam;
[0023] 30. Prestressed tendons;
[0024] 11. Cantilever section;
[0025] 21. End;
[0026] 22. Stirrups;
[0027] 23. Positioning ribs;
[0028] 24. Bellows;
[0029] 25. Strengthening ribs;
[0030] 26. Embedded parts. DETAILED DESCRIPTION
[0031] Example 1
[0032] See also Figure 1-Figure 3 This embodiment provides a post-tensioned prestressed double T-beam / slab with a cantilever to solve the problem that the existing cast-in-place method has a large cross-section that affects the space height and has a high cost when realizing a large span and cantilever of a spatial structure.
[0033] In this embodiment, the post-tensioned double T-beam / plate with cantilever includes an integrally formed plate surface 10 and a rib beam 20, wherein the height of the end 21 of the rib beam 20 decreases from the inside to the outside, and the plate surface 10 corresponding to the end 21 forms a cantilever section 11, and a downward-bent prestressed beam 30 tensioned by the post-tensioning method is penetrated inside the rib beam 20, and both ends of the prestressed beam 30 are led out from the upper side of the cantilever section 11.
[0034] In this embodiment, the rib beam 20 and the plate surface 10 are post-tensioned along the span direction by means of the prestressed beam 30, so that the reinforcement near the top of the plate surface 10 is extended outward to become the force-bearing reinforcement of the cantilever section 11. The large cantilever achieved can increase the span of a single span.
[0035] It should be noted that, in the present embodiment, the plate surface 10 and the rib beam 20 are integrally cast in a prefabricated manner, and the rib beam 20 and the plate surface 10 have the same longitudinal length along the span direction, the rib beam 20 is symmetrically arranged at the bottom of the plate surface 10, and the height of the two ends 21 of the rib beam 20 decreases from the inside to the outside, so that the rib beam 20 as a whole is constructed into a trapezoid that is wide at the top and narrow at the bottom. In order to improve the overall structural strength, reinforcing ribs 25 are integrally formed on the bottom surface of the plate surface 10 between the two rib beams 20, and the reinforcing ribs 25 are arranged vertically to the rib beam 20. A plurality of reinforcing ribs 25 are arranged at intervals along the longitudinal direction of the plate surface 10, and an exposed embedded part 26 (such as a steel plate) is provided inside the rib beam 20, and the embedded part 26 is used for matching connection with other components.
[0036] In addition, a stirrup 22 extending into the plate surface 10 is provided inside the rib beam 20, the stirrup 22 is arranged vertically with the plate surface 10 as a whole, the stirrup 22 is constructed as a whole in a rectangular shape, a positioning rib 23 is fixed to the top of the stirrup 22, and the positioning rib 23 and the stirrup 22 enclose a positioning space for the corrugated tube 24 to pass through. The corrugated tube 24 is pre-embedded in the rib beam 20 and the plate surface 10 as a whole. Specifically, the middle section of the corrugated tube 24 is bent toward the bottom surface side of the rib beam 20. After both ends of the bellows 24 pass through the aforementioned positioning space enclosed by the positioning ribs 23 and the stirrups 22, they are led out from the end surface of the cantilever section 11 in a manner that remains parallel to the cantilever section 11, and the lead-out position of the bellows 24 at the end of the cantilever section 11 is arranged near the top surface of the plate surface 10, and the prestressed bundle 30 is passed through the inside of the bellows 24. The arrangement curve of the bellows 24 defines the overall arrangement curve of the prestressed bundle 30 in the rib beam 20 and the plate surface 10.
[0037] It should also be noted that the two ends of the plate surface 10 located at the end 21 of the rib beam 20 form a cantilever section 11, and the cantilever section 11 and the end 21 have the same longitudinal length. In this embodiment, the prestressed tendons arranged in a curve using the post-tensioning prestressing method are changed from the bottom of the mid-span of the traditional simply supported beam to the end near the top, and at the same time extend outward along the top to become the force-bearing reinforcement of the cantilever section 11, thereby achieving the purpose of increasing the span of a single span through a large cantilever.
[0038] It should be understood that, in the cantilevered post-tensioned double T-beam / slab of this embodiment, the slab surface 10 can also be made into a sloped slab type, that is, the slab surface 10 protrudes upward at the middle position along the span direction.
[0039] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A post-tensioned double T beam / slab with cantilever, characterized in that: It includes an integrally formed plate surface and rib beam, the height of the end of the rib beam decreases from the inside to the outside, the plate surface corresponding to the end forms a cantilevered section, and a downward-bent prestressed bundle tensioned by a post-tensioning method is penetrated inside the rib beam, and both ends of the prestressed bundle are led out from the upper side of the cantilevered section.
2. The post-tensioned double T beam / slab with cantilever according to claim 1, characterized in that: Stirrups extending into the plate surface are arranged inside the rib beam.
3. The post-tensioned double T beam / slab with cantilever according to claim 2, characterized in that: The stirrups are provided with positioning bars for fixing the prestressed tendons.
4. The post-tensioned double T beam / slab with cantilever as claimed in claim 3, characterized in that: The two ends of the prestressed bundle pass through the positioning ribs and are arranged parallel to the cantilever section.
5. The post-tensioned double T beam / slab with cantilever according to claim 4, characterized in that: The outer part of the prestressed bundle is sheathed with a bellows.
6. The post-tensioned double T beam / slab with cantilever according to claim 5, characterized in that: The corrugated pipe is pre-buried in the rib beam and the plate surface.
7. The post-tensioned double T beam / slab with cantilever according to claim 6, characterized in that: The rib beam and the panel have the same longitudinal length.
8. The post-tensioned double T beam / slab with cantilever according to claim 7, characterized in that: The rib beams are symmetrically arranged at the bottom of the panel.
9. The post-tensioned double T beam / slab with cantilever according to claim 8, characterized in that: Reinforcing ribs are arranged between the rib beams.
10. The post-tensioned double T beam / slab with cantilever according to claim 9, characterized in that: The reinforcing rib is arranged perpendicularly to the rib beam.