Bridge enlarging and reinforcing structure
By adopting the thin-layer enlarged cross-section reinforcement method in the bridge structure, the combination of main reinforcement, planting reinforcement, stirrup, outsourcing concrete layer and steel plates, the existing reinforcement structure has solved the problems of high bearing capacity requirements and high burden on the bearing capacity, and the effective reinforcement and bearing capacity of the bridge structure have been achieved.
Patent Information
- Application Number
- CN202420528254.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-03-19
AI Technical Summary
The existing enlarged cross-section reinforcement structure has high requirements for the bearing capacity of the original bridge structure and has an additional burden on the lower structure and foundation. It is impossible to effectively reinforce the structure with a lack of bearing capacity and usually requires demolition and reconstruction.
A thin-layer enlarged cross-section reinforcement structure is adopted, including main reinforcement, planting reinforcement, stirrup, outsourcing concrete layer and steel plate. Through the combined use of ultra-high performance concrete and steel structure, the burden on the original bridge structure is reduced and the bearing capacity of the bridge is enhanced.
It has achieved effective reinforcement of the bridge structure, reduced the burden on the lower structure and foundation, improved the bearing capacity of the bridge, and maintained the beautiful overall appearance.
Smart Images
Figure CN222796222U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of bridges, in particular to an enlarged and reinforced structure of a bridge. Background Art
[0002] The existing conventional bridge cross-section reinforcement is to increase the cross-section of the existing structure by adding a small number of cross-sections of the same material to enhance its bearing capacity. The premise of the reinforcement is that the main bridge structure still has a certain bearing capacity. If the main structure has serious defects (such as serious degradation of material performance), it is generally recommended to demolish and rebuild.
[0003] The existing reinforcement method of increasing the cross section is to add additional cross sections on the basis of the existing structure by planting steel bars, anchor bolts, etc. The newly added material is generally self-leveling concrete, which is thicker in size and has a very limited improvement on the bearing capacity of the structure. For structures that lack more bearing capacity, a larger additional cross section must be added to meet the bearing requirements, but this approach will obviously put an additional heavy burden on the lower structure and foundation. Sometimes the lower structure and foundation may not allow the upper and lower structures to increase the cross section in a larger area. Utility Model Content
[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is that the existing enlarged cross-section reinforcement structure has relatively high requirements on the bearing capacity of the original bridge structure, and also generates additional large burdens on the lower structure and foundation of the original structure with bearing capacity, and the structure with insufficient bearing capacity can only be demolished. The utility model provides a bridge enlargement reinforcement structure, which adopts a thin layer to enlarge the cross-section, reduces the burden on the original bridge structure, improves the bearing capacity of the bridge, and the overall reinforcement makes the overall appearance beautiful. It is not only suitable for the original bridge that has bearing capacity, but also suitable for the original bridge with weak bearing capacity.
[0005] To achieve the above-mentioned purpose, the utility model provides a bridge enlargement and reinforcement structure, which is added to one side or both sides of the original bridge structure, including main bars, embedded bars, stirrups, an outer concrete layer and a steel plate, wherein embedded bars are arranged along the bridge direction, main bars are arranged longitudinally, stirrups are arranged perpendicular to the main bars and embedded bars to form closed stirrups; the embedded bars are arranged to be inserted into the original bridge structure; the outer concrete layer is connected to the original bridge structure, and at the same time the main bars, embedded bars and stirrups are completely covered; the steel plate is arranged at the bottom end of the original bridge structure.
[0006] Furthermore, the anchor bar is φ12, the anchor bar hole is 16mm, and the anchor bar spacing is 300mm.
[0007] Furthermore, the positions of the embedded reinforcement bars on adjacent surfaces are staggered.
[0008] Furthermore, the outer concrete layer is configured as ultra-high performance concrete.
[0009] Furthermore, the outer concrete layer is configured as a combined structure of ultra-high performance concrete and steel structure.
[0010] Further, the outer concrete layer is set to 10 cm.
[0011] Furthermore, the embedded reinforcement is set to be Ф12mm threaded steel bars.
[0012] Furthermore, the thickness of the steel plate is set to 1 cm.
[0013] Technical Effects
[0014] The utility model discloses a bridge enlargement and reinforcement structure, which reinforces the bridge in the form of overall outsourcing enlargement. After the reinforcement and reconstruction, only the new structure can bear the load and meet the use requirements. A thin layer is used to increase the cross-section to reduce the burden on the lower structure or foundation of the existing bridge as much as possible. Ultra-high performance concrete is used to improve the bearing capacity of the existing bridge, and the load requirements can be met without considering the contribution of the existing bridge structure. The overall appearance after reinforcement is beautiful.
[0015] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a cross-sectional schematic diagram of a bridge enlargement and reinforcement structure of a preferred embodiment of the utility model;
[0017] Figure 2 It is a schematic diagram of a bridge enlargement and reinforcement structure of a preferred embodiment of the utility model. DETAILED DESCRIPTION
[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0019] like Figure 1-2 As shown, the utility model provides a bridge enlargement and reinforcement structure, which is added to one side or both sides or the top surface of the original bridge structure, including main reinforcement 1, embedded reinforcement 2, stirrups 3, an outer concrete layer 4 and a steel plate 5, wherein the embedded reinforcement 2 is arranged along the bridge direction, the main reinforcement 1 is arranged longitudinally, the stirrups 3 are arranged to be perpendicular to the main reinforcement 1 and the embedded reinforcement 2, forming closed stirrups; the embedded reinforcement is arranged to be inserted into the original bridge structure 6; the outer concrete layer 4 is connected to the original bridge structure 6, and at the same time completely covers the main reinforcement 1, the embedded reinforcement 2, and the stirrups 3; the steel plate 5 is arranged at the bottom end of the original bridge structure.
[0020] The embedded steel bar is φ12, the embedded steel bar hole is 16mm, and the embedded steel bar spacing is 300mm. The embedded steel bars on adjacent surfaces are staggered. The embedded steel bars are set as Ф12mm threaded steel bars.
[0021] In this embodiment, the outer concrete layer 4 is configured as ultra-high performance concrete.
[0022] In another preferred embodiment, the outer concrete layer is configured as a combined structure of ultra-high performance concrete and steel structure, which reduces its weight and further reduces the burden on the existing bridge, while further significantly improving its bearing capacity.
[0023] The outer concrete layer 4 is set to 10 cm.
[0024] The thickness of the steel plate 5 is set to 1 cm.
[0025] In the utility model, the original bridge structure is reinforced by enclosing 10cm thick UHPC on both sides and the top surface to increase the cross-section, and gluing 1cm thick steel plates on the bottom surface (considering that the clear height of the navigation channel cannot be compressed), wherein the steel plate 5 on the bottom surface is welded to the steel bar 7, and the steel bar is anchored in the concrete. First, the existing structure is planted with steel bars, the diameter of the steel bars is φ12, the steel bar holes are 16mm, the spacing of the steel bars is 300mm (along the bridge direction), and the positions of the steel bars on adjacent surfaces are staggered. The top and bottom of the arch ribs enclosed with 10cm thick UHPC are provided with φ25 longitudinal main bars, closed stirrups, and φ16 longitudinal full-length steel bars on the sides. Planting steel bars refers to drilling holes in the existing structure and then planting steel bars, and the planted steel bars are connected to the existing structure through the steel bar planting glue. The functions of the longitudinal full-length steel bars on the side: (1) acting as a skeleton and forming a whole with the outer concrete; (2) preventing the new outer concrete from generating shrinkage cracks; (3) sharing the load with the outer concrete after the outer concrete reaches the design strength. This φ16 longitudinal full-length steel bar can be understood as main reinforcement + waist reinforcement.
[0026] Among them, in another preferred embodiment, the bottom steel plate is connected to the existing structure by steel glue and chemical anchor bolts;
[0027] In this embodiment, the added additional section, after its strength reaches the design value, can bear the entire bridge load and safely bear the live load on the bridge (cars, non-motor vehicles, pedestrians) by itself.
[0028] The specific implementation method of the bridge enlargement and reinforcement structure of this embodiment is: roughening concrete → drilling holes and planting reinforcement → tying reinforcement → installing formwork → pouring concrete → curing concrete.
[0029] (1) Roughening the concrete contact surface
[0030] In order to ensure that the newly poured UHPC and the original structural concrete are well bonded and bear the force together, the original concrete surface needs to be roughened into a rough surface with a bump of no less than 6mm, rather than a flat rough surface, so that the new and old concrete can bond as a whole.
[0031] Concrete roughening requires removing the floating slurry on the concrete surface to expose the coarse aggregate. The concrete surface can be roughened mechanically or manually, and mechanical roughening is preferred when conditions permit.
[0032] (2) Drilling and planting steel bars
[0033] Plant Ф12mm threaded steel bars on the joint surface. Avoid hitting the steel bars when drilling blind holes. The drilling diameter is 16mm and arranged in a plum blossom shape. The steel bar pull-out force is above 50kN. The implanted steel bars cannot be moved within 24 hours after injection.
[0034] (3) Tie steel bars
[0035] Tie or spot weld the steel bars to the anchor bars: Tie or spot weld the reinforcement bars to the anchor bars to prevent them from moving when pouring concrete. When installing the steel bars, try to avoid crossing three steel bars to avoid voids when pouring concrete.
[0036] (4) Install the template
[0037] Set up the formwork and ensure that the joints of the formwork are sufficiently sealed to prevent leakage. In order to make the concrete surface smooth, it is recommended to use plastic plywood as the formwork.
[0038] (5) Casting UHPC
[0039] To ensure the quality of UHPC pouring, traffic should be closed during the period from when UHPC is poured until it reaches the design strength.
[0040] Considering the narrow space for pouring UHPC on site, especially the limited working space and difficult vibration, the poured UHPC must be carried out in accordance with the manufacturer's technical requirements. Special attention should be paid to the control of the amount of water added, and mixing must be carried out according to the amount of water provided by the manufacturer.
[0041] (6) Concrete curing
[0042] After the concrete is poured, water it frequently to keep it moist, and the curing time should be no less than 7 days. The number of watering times should be sufficient to ensure that the concrete surface is moist.
[0043] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.
Claims
1. A bridge enlargement and reinforcement structure, characterized in that: It is added to one or both sides of the original bridge structure, including main bars, embedded bars, stirrups, an outer concrete layer and a steel plate, wherein the embedded bars are arranged along the bridge direction, the main bars are arranged longitudinally, the stirrups are arranged to be perpendicular to the main bars and the embedded bars to form closed stirrups; the embedded bars are arranged to be inserted into the original bridge structure; the outer concrete layer is connected to the original bridge structure, and at the same time completely covers the main bars, the embedded bars and the stirrups; the steel plate is arranged at the bottom end of the original bridge structure.
2. A bridge enlargement and reinforcement structure as claimed in claim 1, characterized in that: The rebar is φ12, the rebar hole is 16mm, and the rebar spacing is 300mm.
3. A bridge enlargement and reinforcement structure as claimed in claim 2, characterized in that: The positions of the embedded reinforcement bars on adjacent surfaces are staggered.
4. The bridge enlargement and reinforcement structure according to claim 1, characterized in that: The outer concrete layer is configured as ultra-high performance concrete.
5. The bridge enlargement and reinforcement structure according to claim 1, characterized in that: The outer concrete layer is configured as a combined structure of ultra-high performance concrete and steel structure.
6. The bridge enlargement and reinforcement structure according to claim 1, characterized in that: The outer concrete layer is set to 10 cm.
7. The bridge enlargement and reinforcement structure according to claim 2, characterized in that: The embedded reinforcement is configured as Ф12mm threaded steel bars.
8. The bridge enlargement and reinforcement structure according to claim 1, characterized in that: The thickness of the steel plate is set to 1 cm.