Uniform-section pre-tensioning method T-beam structure

Abstract

The uniform-section pre-tensioning T-beam structure comprises a simply-supported T-beam, prestressed steel beams, a steering gear and a web plate, the web plate is arranged at the bottom of the simply-supported T-beam, the prestressed steel beams are used for connecting the two ends of the simply-supported T-beam, the steering gear is used for pressing the prestressed steel beams to change the direction of the prestressed steel beams, and the prestressed steel beams comprise linear beams and broken line beams. The web comprises a uniform-section structure, and the linear bundle is arranged in the middle of the lower portion of the uniform-section structure and used for penetrating through the simply-supported T-beam to be connected with the two ends of the simply-supported T-beam. The steering gear is used for pressing the linear bundle, so that the direction of the linear bundle is changed, the linear bundle is arranged to be the broken-line bundle, and the broken-line bundle pre-tensioning method prestressed beam can improve the stress state of the beam ends on the two sides of the simply-supported T-beam, so that the beam ends on the two sides of the simply-supported T-beam are effectively prevented from inclining to generate cracks; and meanwhile, the stress state of the web of the simply supported T-beam can be improved, so that the span range is obviously enlarged.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a uniform cross-section pre-tensioned T-beam structure. Background Art

[0002] Faced with the actual needs of bridge standardization, assembly and industrialization, the development of high-performance bridge structures with high construction performance, high usage performance and high durability has become an important development trend.

[0003] At present, in my country's bridge construction, hollow slab beams, T beams, small box beams, etc. are the main beam types used in small and medium span bridges. Under the background of rapid development of green construction and industrialized construction technology, these beam types have some shortcomings in quality control, manufacturing efficiency, durability, etc. It is necessary to develop new structural forms through collaborative research on design and manufacturing in response to the requirements of industrialized construction and full life cycle economy. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a pre-tensioned T-beam structure with equal cross-section, which solves the problems of complex structure and low utilization rate of traditional T-beam templates and inconvenient operation during prefabrication. Moreover, pre-tensioned prestressed concrete mainly relies on the self-anchoring of the bonding force between the prestressed steel bars and concrete to transmit prestress. Compared with the post-tensioning method, the pre-tensioning method does not require the processes of leaving holes, threading bundles, grouting, and sealing anchors. The construction process is simple, and materials such as corrugated pipes, anchors, steel bars under anchors, and pipe slurry are saved. In addition, the present invention solves the quality risks such as blockage of channels, loose grouting, and insufficient prestressing force in the mid-span area caused by large friction resistance that may occur in the post-tensioning construction to a certain extent. The pre-tensioning method is suitable for mass production in prefabrication factories.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a uniform cross-section prestressed T-beam structure, comprising a simply supported T-beam, a prestressed steel bundle, a deflector and a web, wherein a web is provided at the bottom of the simply supported T-beam, the prestressed steel bundle is used to connect the two ends of the simply supported T-beam, and the deflector is used to press the prestressed steel bundle to change the direction of the prestressed steel bundle.

[0006] Preferably, the prestressed steel bundle includes a straight bundle and a broken bundle, the web includes a uniform cross-sectional structure, the straight bundle is arranged in the lower middle part of the uniform cross-sectional structure, and the straight bundle is used to penetrate the simply supported T-beam and connect to both ends of the simply supported T-beam.

[0007] Preferably, the fold line bundle is arranged on the outside of the lower straight line bundle of the equal-section structure, the fold line bundle is used to be connected to the two ends of the simply supported T-beam, and a diverter is provided at a certain interval of the fold line bundle arranged in the equal-section structure, the diverter is used to press the fold line bundle to change the direction of the fold line bundle and enter the position of the upper web of the equal-section structure from the bottom.

[0008] Preferably, two diverters are arranged on the simply supported T-beam, and the diverters are fixed on a construction platform inside the simply supported T-beam.

[0009] Preferably, the web further comprises a wing plate, which can be enlarged according to the cross-sectional size of the simply supported T-beam, and a narrow joint is formed between the enlarged wing plate and the simply supported T-beam.

[0010] Preferably, the uniform cross-section structure can increase the web thickness according to the force requirements of the simply supported T-beam.

[0011] Preferably, spiral reinforcements are provided on the periphery of the prestressed steel bundles at both ends of the simply supported T-beam.

[0012] Preferably, both ends of the simply supported T-beam are provided with embedded templates, and notches are formed on the embedded templates after the concrete is poured.

[0013] Compared with the existing technology, the utility model has the following beneficial effects: the utility model uses a steering device to press the straight beam, so that the straight beam changes direction and is set into a folded beam. The prestressed beam pre-tensioned by the folded beam method can not only improve the stress state of the beam ends on both sides of the simply supported T-beam, thereby effectively preventing the beam ends on both sides of the simply supported T-beam from tilting and cracking, but also improve the stress state of the web of the simply supported T-beam, thereby significantly increasing the span range, and appropriately increasing the width of the wing plate on the web to reduce the width of the joint between the simply supported T-beam and the wing plate, thereby forming a narrow joint, and the on-site welding of steel bars at the joint can be eliminated, thereby improving the on-site construction progress, and at the same time, the degree of industrialization of bridge construction is improved, and when the simply supported T-beam is spliced ​​on-site, the narrow joints between the wing plate and the simply supported T-beam are made of self-compacting steel fiber concrete material to enhance the crack resistance of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the plane structure of a practical simply supported T-beam.

[0015] Figure 2 This is a schematic diagram of the plane structure of the equal-section structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the first uniform cross-section structure and prestressed steel bundle plane structure of this utility model.

[0017] Figure 4 This is a schematic diagram of the second uniform cross-section structure and prestressed steel bundle plane structure of this utility model.

[0018] Figure 5 This is a schematic diagram of the plane structure of spiral reinforcement and prestressed steel strands for this application.

[0019] Markings in the figure: 1. Simply supported T-beam, 2. Uniform cross-section structure, 3. Prestressed steel strand, 31. Straight strand, 32. Broken strand, 4. Diverter, 5. Web, 6. Flange, 7. Narrow joint, 8. Notch, 9. Spiral reinforcement. DETAILED DESCRIPTION

[0020] like Figure 1-Figure 5 As shown, the utility model provides a technical solution: a uniform cross-section prestressed T-beam structure, comprising a simply supported T-beam 1, a prestressed steel bundle 3, a deflector 4 and a web 5, wherein the web 5 is provided at the bottom of the simply supported T-beam 1, the prestressed steel bundle 3 is used to connect the two ends of the simply supported T-beam 1, and the deflector 4 is used to press the prestressed steel bundle 3 to change the direction of the prestressed steel bundle 3.

[0021] Furthermore, the prestressed steel bundle 3 includes a straight bundle 31 and a broken bundle 32, the web 5 includes a uniform cross-sectional structure 2, the straight bundle 31 is arranged in the lower middle part of the uniform cross-sectional structure 2, and the straight bundle 31 is used to penetrate the simply supported T-beam 1 and connect to both ends of the simply supported T-beam 1.

[0022] Furthermore, the folded line bundle 32 is arranged on the outside of the lower straight line bundle 31 of the equal-section structure 2, and the folded line bundle 32 is used to be connected to the two ends of the simply supported T-beam 1, and a deflector 4 is provided at a certain interval of the folded line bundle 32 arranged in the equal-section structure 2, and the deflector 4 is used to press the folded line bundle 32 to change the direction of the folded line bundle 32 and enter the position of the upper web 5 of the equal-section structure 2 from the bottom; on the basis of the arrangement of the straight line bundle 31 of the simply supported T-beam 1, the straight line bundle 31 is arranged into a folded line bundle 32 through the deflector 4, and the prestressed beam of the folded line bundle 32 can not only improve the stress state of the beam ends on both sides of the simply supported T-beam 1, thereby effectively preventing the beam ends on both sides of the simply supported T-beam 1 from tilting and cracking, but also improve the stress state of the web 5 of the simply supported T-beam 1, thereby significantly increasing the span range.

[0023] Furthermore, the diverter 4 is a pull-plate type steel diverter, and two diverters 4 are arranged on each simply supported T-beam 1, which are respectively arranged at about one-third and two-thirds of the longitudinal beam body of the simply supported T-beam 1, and the diverter 4 is fixed on the construction platform inside the simply supported T-beam 1.

[0024] Furthermore, the web 5 also includes a wing plate 6. The equal-section structure 2 adopts a traditional T-beam mid-span standard section. The wing plate 6 can be enlarged according to the cross-sectional size of the simply supported T-beam 1, and a narrow joint 7 is formed between the enlarged wing plate 6 and the simply supported T-beam 1; the width of the wing plate 6 is appropriately increased to reduce the width of the joint between the simply supported T-beam 1 and the wing plate 6, thereby forming a narrow joint 7, and the on-site welding of steel bars at the joint can be eliminated, thereby improving the on-site construction progress and the degree of industrialization of bridge construction; and when the simply supported T-beam 1 is spliced ​​on-site, the narrow joint 7 between the wing plate 6 and the simply supported T-beam 1 is made of self-compacting steel fiber concrete material to enhance the crack resistance of the connection.

[0025] Furthermore, the uniform cross-section structure 2 can increase the thickness of the web 5 according to the force requirements of the simply supported T-beam 1; the cross-section of the simply supported T-beam 1 is improved from a variable cross-section to a uniform cross-section, and the thickness of the web 5 is appropriately increased, which not only improves the upper limit of the inclined cross-section resistance, but also does not increase the engineering cost too much.

[0026] Furthermore, spiral steel bars 9 are provided on the periphery of the prestressed steel bundles 3 on the simply supported T-beam 1; spiral steel bars 9 are provided on each of the prestressed steel bundles 3 at both ends of the simply supported T-beam 1, which prevents local damage to the concrete at the two ends of the simply supported T-beam 1 under the action of tensile stress.

[0027] Furthermore, both ends of the simply supported T-beam 1 are provided with embedded templates, and a notch 8 is formed on the embedded template after concrete is poured, and the width of the reserved notch 8 at both ends of the simply supported T-beam 1 is 0.1 meters to 0.15 meters; embedded templates are set at both ends of the simply supported T-beam 1, and after concrete is poured, a notch 8 is formed, and the prestressed steel bundle 3 on the simply supported T-beam 1 is connected to the formed notch 8, and after the prestressed steel bundle 3 is cut, the anchor is sealed in time and effective anti-corrosion treatment is performed on the range where the prestressed steel bundle 3 is arranged at both ends of the simply supported T-beam 1 to prevent the prestressed steel bundle 3 from rusting.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A uniform cross-section pre-tensioned T-beam structure, comprising a simply supported T-beam (1), a prestressed steel strand (3), a deflector (4) and a web (5), characterized in that: The simply supported T-beam (1) is provided with a web (5) at the bottom, the prestressed steel bundle (3) is used to connect the two ends of the simply supported T-beam (1), and the deflector (4) is used to press the prestressed steel bundle (3) to change the direction of the prestressed steel bundle (3); the prestressed steel bundle (3) includes a straight bundle (31) and a broken line bundle (32), the web (5) includes a uniform cross-sectional structure (2), the straight bundle (31) is arranged at the middle part of the lower part of the uniform cross-sectional structure (2), and the straight bundle (31) is used to penetrate the simply supported T-beam (1) and connect to the two ends of the simply supported T-beam (1); the broken line bundle (32) is provided at the bottom of the simply supported T-beam (1) and connect to the two ends of the simply supported T-beam (1); The bundle (32) is arranged outside the straight bundle (31) at the lower part of the uniform cross-section structure (2); the folded bundle (32) is used to be connected to the two ends of the simply supported T-beam (1); and a deflector (4) is provided at a certain interval where the folded bundle (32) is arranged in the uniform cross-section structure (2); the deflector (4) is used to press the folded bundle (32) to change the direction of the folded bundle (32) so as to enter the position of the upper web (5) of the uniform cross-section structure (2) from the bottom; two deflectors (4) are provided on the simply supported T-beam (1), and the deflectors (4) are fixed on a construction pedestal inside the simply supported T-beam (1).

2. The uniform cross-section pre-tensioned T-beam structure according to claim 1, characterized in that: The web plate (5) further comprises a wing plate (6), which can be enlarged according to the cross-sectional dimensions of the simply supported T-beam (1), and a narrow joint (7) is formed between the enlarged wing plate (6) and the simply supported T-beam (1).

3. The uniform cross-section pre-tensioned T-beam structure according to claim 2, characterized in that: The uniform cross-section structure (2) can increase the thickness of the web (5) according to the force requirements of the simply supported T-beam (1).

4. The uniform cross-section pre-tensioned T-beam structure according to claim 3, characterized in that: Spiral steel bars (9) are provided on the periphery of the prestressed steel bundles (3) at both ends of the simply supported T-beam (1).

5. The uniform cross-section pre-tensioned T-beam structure according to claim 4, characterized in that: Both ends of the simply supported T-beam (1) are provided with embedded templates, and after pouring concrete, notches (8) are formed on the embedded templates.

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