A new and old concrete interlayer shear resistance structure for extending a bridge beam
By adding a thickened bottom plate and prestressed steel reinforcement structure at the joint of the bridge beam, combined with anchoring adhesive and steel strands, the problem of insufficient shear resistance between the old and new concrete layers at the joint of the bridge beam was solved, achieving a stable jointing effect for bridge widening and reconstruction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI TRAFFIC CONTROL KAIDA ROAD & BRIDGE ENG CONSTR CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-06-19
AI Technical Summary
The existing bridge beams have insufficient shear resistance in the interlayer shear structure between the new and old concrete layers during widening and reconstruction, which affects the expansion process.
By setting a thickened bottom plate at the bottom of the main beam, and using prestressed steel bars and anchoring adhesive, along with drilling holes in the box girder and adding new steel strands, the shear resistance between the old and new concrete layers is enhanced. The tension end and fixed end structure of the prestressed steel bars is adopted to increase the cooperative stress-bearing capacity of the steel bars and concrete.
It improves the shear resistance between the old and new concrete layers, ensures that the pavement strength meets the standards, and enhances the stability and extension effect of the main beam.
Smart Images
Figure CN224378725U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge engineering technology, specifically to a shear-resistant structure for extending the new and old concrete layers of a bridge beam. Background Technology
[0002] To improve service levels, highways need to be widened and upgraded. However, since the span of the main beam of the existing overpass cannot meet the widening requirements of the underpass, it directly affects the expansion process. Generally, the expansion is carried out by extending the bridge.
[0003] This application proposes a shear-resistant structure between the new and old concrete layers for extending the bridge beam. Based on the extension and expansion, this structure improves the shear resistance between the new and old concrete layers, ensuring that the pavement strength meets the standards. Utility Model Content
[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.
[0005] In view of the problems existing in the use of the above and / or bridge beam extension new and old concrete interlayer shear structure, this utility model is proposed.
[0006] Therefore, the purpose of this utility model is to provide a shear-resistant structure between the new and old concrete layers for extending bridge beams. This structure facilitates the anchoring of prestressed steel bars through drilling holes in the box girder. The addition of a thickened bottom slab facilitates the extension of the main beam. A thickened bottom slab is provided at the bottom of the main beam. Using prestressed steel bars and tension ends that can adjust the tension, the interlayer shear resistance between the new and old concrete layers is increased. The addition of anchoring adhesive increases the ability of the prestressed steel bars and concrete to work together under stress, making the newly added thickened bottom slab more stable with respect to the main beam.
[0007] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:
[0008] A shear-resistant structure for extending the interlayer of new and old concrete in a bridge beam includes:
[0009] The main beam (100) includes a top plate (102), a web plate (103) and a bottom plate (104), and the bottom of the main beam (100) is provided with a thickened bottom plate (120);
[0010] New steel strands are added, and the new steel strands are evenly distributed in the web (103) region;
[0011] The shear-resistant structure includes prestressed steel bars that penetrate the main beam and the thickened part of the bottom plate, and fixed ends and tension ends respectively disposed at both ends of the prestressed steel bars.
[0012] As a preferred embodiment of the bridge beam extension and new and old concrete interlayer shear structure described in this utility model, the main beam has original steel strands distributed on its sidewalls.
[0013] As a preferred embodiment of the bridge beam extension and interlayer shear structure of new and old concrete as described in this utility model, a coaxial box girder borehole is provided between the main beam and the bottom plate, and the prestressed steel bars pass through the box girder borehole.
[0014] As a preferred embodiment of the bridge beam extension between new and old concrete layers shear resistance structure described in this utility model, the prestressed steel bars are filled with anchoring adhesive between the drilled holes in the box girder.
[0015] As a preferred embodiment of the bridge beam extension interlayer shear structure of new and old concrete as described in this utility model, a gasket is provided between the fixed end and the thickened part of the bottom plate, and the tension end includes a nut and a gasket provided between the nut and the main beam.
[0016] As a preferred embodiment of the interlayer shear-resistant structure for extending the new and old concrete layers of a bridge beam as described in this utility model, one end of the prestressed steel bar is provided with a threaded post, and the nut cooperates with the threaded post.
[0017] As a preferred embodiment of the bridge beam extension and new and old concrete interlayer shear structure described in this utility model, the side wall of the main beam is provided with additional steel strands.
[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: the shear resistance structure between the new and old concrete layers of the bridge beam extension is facilitated by drilling holes in the box girder for anchoring prestressed steel bars, the increase in the thickened bottom plate facilitates the extension of the main beam, the bottom of the main beam is provided with a thickened bottom plate, and the use of prestressed steel bars, in conjunction with tension ends that can adjust the tension, increases the interlayer shear resistance between the new and old concrete. The addition of anchoring adhesive can increase the ability of the prestressed steel bars and concrete to work together to bear the force, making the newly added thickened bottom plate more stable with respect to the main beam. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:
[0020] Figure 1 This is a schematic diagram of the overall structure of a bridge beam extension structure for interlayer shear resistance between new and old concrete layers according to the present invention.
[0021] Figure 2 This is a cross-sectional structural diagram of a bridge beam extension structure between new and old concrete layers, according to the present invention.
[0022] Figure 3 This is a side view of the shear-resistant structure between new and old concrete layers for extending a bridge beam, according to this utility model.
[0023] 100. Main beam; 110. Original steel strand; 120. Thickened bottom plate; 101. Drilling hole for box girder; 102. Top plate; 103. Web plate; 104. Bottom plate; 200. Newly added steel strand; 300. Shear-resistant structure; 301. Rebar adhesive; 310. Prestressed steel bars; 320. Fixed end; 330. Tension end; 331. Gasket. Detailed Implementation
[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0025] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure will not be enlarged to scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.
[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.
[0027] This utility model provides a shear-resistant structure for extending the new and old concrete layers of a bridge beam. Prestressed steel reinforcement is easily anchored through drilling holes in the box girder. The addition of a thickened bottom slab facilitates the extension of the main beam. A thickened bottom slab is provided at the bottom of the main beam. Using prestressed steel reinforcement and tension ends with adjustable tension, the interlayer shear resistance between the new and old concrete layers is increased. The addition of anchoring adhesive enhances the ability of the prestressed steel reinforcement and concrete to work together under stress, making the newly added thickened bottom slab more stable with respect to the main beam.
[0028] Figures 1-3 The diagram shown is a structural schematic of one embodiment of the interlayer shear-resistant structure for extending the new and old concrete layers of a bridge beam according to this utility model. Please refer to [link / reference]. Figures 1-3The present embodiment of a bridge beam extension between new and old concrete layers with shear resistance structure includes a main beam 100, a newly added steel strand 200 and a shear resistance structure 300.
[0029] The main beam 100 is anchored to the prestressed steel bars 310 through the box girder drill hole 101. The addition of the thickened part 120 of the bottom plate facilitates the extension of the main beam 100. Specifically, the main beam 100 includes a top plate 102, a web plate 103 and a bottom plate 104. The bottom of the main beam 100 is provided with a thickened part 120 of the bottom plate. In this embodiment, the original steel strands 110 are distributed on the side wall of the main beam 100. The box girder drill hole 101 is coaxial between the main beam 100 and the bottom plate. The side wall of the main beam 100 is provided with newly added steel strands 200.
[0030] The addition of steel strands 200 increases the internal strength of the thickened part 120 of the bottom plate. Specifically, the addition of steel strands 200 is evenly distributed in the area of the web 103.
[0031] The shear-resistant structure 300 utilizes prestressed steel bars 310, along with tension ends 330 that can adjust tension, to increase the interlayer shear resistance between new and old concrete. The addition of anchoring adhesive 301 can increase the ability of prestressed steel bars and concrete to work together to bear the load, making the newly added thickened bottom slab 120 more stable with the main beam 100. Specifically, the shear-resistant structure 300 includes prestressed steel bars 310 penetrating the main beam 100 and the thickened bottom slab 120, and prestressed steel bars 310 respectively disposed at both ends of the prestressed steel bars 310. In this embodiment, the prestressed steel bar 310 passes through the box girder drill hole 101, and the prestressed steel bar 310 is filled with anchoring adhesive 301 between the box girder drill hole 101. A gasket 331 is provided between the fixed end 320 and the thickened part 120 of the bottom plate. The tension end 330 includes a nut and a gasket 331 provided between the nut and the main beam 100. One end of the prestressed steel bar 310 is provided with a threaded post, and the nut cooperates with the threaded post.
[0032] Combination Figures 1-3 This embodiment describes a bridge beam extension structure for interlayer shear resistance between new and old concrete. The specific usage process is as follows: prestressed steel bars 310 are anchored by drilling holes 101 in the box girder; the addition of the thickened bottom plate 120 facilitates the extension of the main beam 100; the addition of steel strands 200 increases the internal strength of the thickened bottom plate 120; the prestressed steel bars 310, in conjunction with the tension end 330 that can adjust the tension, increase the interlayer shear resistance between the new and old concrete; the addition of anchoring adhesive 301 can increase the ability of the prestressed steel bars and concrete to work together to bear the load, making the newly added thickened bottom plate 120 and the main beam 100 more stable.
[0033] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A new and old concrete interlayer shear resistance structure for bridge girder lengthening, characterized by, include: The main beam (100) includes a top plate (102), a web plate (103) and a bottom plate (104), and the bottom of the main beam (100) is provided with a thickened part (120) of the bottom plate; A new steel strand (200) is added, which is evenly distributed in the web (103) region; Shear-resistant structure (300), the shear-resistant structure (300) includes prestressed steel bars (310) penetrating the main beam (100) and the thickened part of the bottom plate (120) and fixed ends (320) and tension ends (330) respectively disposed at both ends of the prestressed steel bars (310).
2. The new and old concrete interlayer shear resistance structure for extending the bridge beam body according to claim 1, characterized in that, The main beam (100) has original steel strands (110) distributed on its side walls.
3. The new and old concrete interlayer shear resistance structure for extending a bridge beam body according to claim 2, characterized in that, A coaxial box girder borehole (101) is provided between the main beam (100) and the bottom plate, and the prestressed steel bars (310) pass through the box girder borehole (101).
4. The new and old concrete interlayer shear resistance structure for bridge beam lengthening according to claim 3, characterized in that, The prestressed steel bars (310) are filled with anchoring adhesive (301) between the holes (101) in the box girder.
5. The new and old concrete interlayer shear resistance structure for extending a bridge beam body according to claim 4, characterized in that, A gasket (331) is provided between the fixed end (320) and the thickened part of the base plate (120), and the tension end (330) includes a nut and a gasket (331) provided between the nut and the main beam (100).
6. The new and old concrete interlayer shear resistance structure for bridge beam lengthening according to claim 5, characterized in that, One end of the prestressed steel bar (310) is provided with a threaded post, and the nut is engaged with the threaded post.
7. The new and old concrete interlayer shear resistance structure for bridge beam lengthening according to claim 6, characterized in that, The side wall of the main beam (100) is provided with additional steel strands (200).