Expressway box girder broadening connecting structure
By using CFPR grille, ECC cushion and other components in the highway box girder widening connection structure, the problem that traditional splicing widening methods are difficult to effectively resist when facing vehicle vibration is solved, the high rigidity and durability of the structure are achieved, and maintenance needs are reduced.
Patent Information
- Application Number
- CN202421932562.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-09
AI Technical Summary
The traditional cast-in-place concrete wet joint method is difficult to effectively resist the vibration caused by the vehicle when the new and old bridges are spliced, resulting in the increase in pressure on the widening point and the degree of cracks at the cracks, which requires frequent maintenance and renovation.
A widening connection structure for box beams of highways is designed, using components such as CFPR grille, ECC cushion layer, open-hole steel plate, anchor bolts and self-contained concrete layer to enhance the connection between new and old box beams, disperse vehicle loads, and prevent cracks from expanding.
It effectively improves the connection between the new box girder and the old bridge, can transition the interval smoothly and stably, significantly reduce cracks at the joints, reduce maintenance costs, and has good economicality and construction convenience.
Smart Images
Figure CN222908522U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of box girder widening connection, in particular to a highway box girder widening connection structure. Background Art
[0002] With the rapid development of my country's economy and transportation, the requirements for road traffic capacity are getting higher and higher. It is urgent to upgrade the quality of existing expressways. Existing bridges need to be spliced and widened in cross-river sections. Bridge splicing and widening can not only improve the bearing capacity and traffic capacity of the original bridge, but also save money and land compared to building a new bridge. Large box girder cross-section has high rigidity and good integrity. It is better than hollow slabs and T-sections in improving the bearing capacity of bridges after splicing and widening, and has broad application prospects.
[0003] In widening technology, the traditional cast-in-place concrete wet joint method no longer meets the current requirements for widening new and old bridges. When vehicles pass through the widening points, the vibrations caused by the vehicles can easily cause the widening points to bear increased pressure, increase the degree of cracking at the cracks, and require frequent maintenance and repairs.
[0004] Therefore, in view of the fact that the above-mentioned traditional cast-in-place concrete wet joint method is no longer suitable for the current requirements of widening new and old bridges, a highway box girder widening connection structure can be designed. It has good durability, can effectively resist the vibration caused by passing vehicles, disperse vehicle loads and prevent crack expansion while improving the stiffness of the connection structure, thereby preventing cracks at the joints. The process is simple, the construction is convenient, and it is conducive to promotion. At the same time, it has good durability, reduces maintenance costs, has good economy, fast construction speed, and low overall cost. Utility Model Content
[0005] In order to overcome the problem that the traditional cast-in-place concrete wet joint method is no longer suitable for the current requirements of widening new and old bridges, when vehicles pass through the widening points, the vibrations caused by the vehicles can easily lead to increased pressure on the widening points, increasing the degree of cracking at the cracks and requiring frequent maintenance and repairs.
[0006] The technical solution of the utility model is: a highway box girder widening connection structure, comprising an original bridge box girder plate, an original bridge asphalt pavement layer, a new bridge box girder plate, a CFPR grille, an ECC cushion layer, a perforated steel plate, anchor bolts, a self-compacting concrete layer, a rubber cushion block and a new bridge box girder asphalt pavement layer, the surface of the original bridge box girder plate is provided with the original bridge asphalt pavement layer, the original bridge box girder plate and the new bridge box girder plate are spliced, both ends of the steel plate are respectively fixed to the original bridge box girder plate and the new bridge box girder plate by anchor bolts, the self-compacting concrete layer is laid between the original bridge box girder plate, the new bridge box girder plate and the perforated steel plate, the ECC cushion layer is laid above the perforated steel plate, and the perforated steel plate is wrapped in the ECC cushion layer, the original bridge asphalt pavement layer is laid on the original bridge box girder plate, the new bridge box girder asphalt pavement layer is laid on the new bridge box girder plate and wrapped with the ECC cushion layer, one end of the CFPR grille is built in the ECC cushion layer, and the other end is built in the new bridge box girder asphalt pavement layer.
[0007] Preferably, a CFPR grid is set between the ECC cushion layer and the asphalt pavement layer of the new bridge box girder to strengthen the connection between the ECC cushion layer and the asphalt pavement layer of the new bridge box girder, and a steel plate is used to strengthen the connection between the new and old box girder plates, and filled with self-compacting concrete, thereby effectively improving the connection between the new box girder and the old bridge, and the connection structure between the ECC cushion layer and the perforated steel plate can ensure that the transition interval is smooth and stable.
[0008] Preferably, at the top of the original bridge box girder slab and the new bridge box girder slab, the perforated steel plate is placed above the rubber pad; at the bottom of the original bridge box girder slab and the new bridge box girder slab, the perforated steel plate is placed below the rubber pad.
[0009] Preferably, the anchor bolts penetrate both sides of the perforated steel plate, the rubber pads, and the original bridge box girder plate and the new bridge box girder plate to anchor the perforated steel plate, the rubber pads, the original bridge box girder plate and the new bridge box girder plate.
[0010] Preferably, a layer of epoxy resin sealant is wrapped around the gap between the anchor bolt and the perforated steel plate and the surrounding area.
[0011] Preferably, the anchor bolt includes a screw rod and a nut for anchoring with the screw rod. After the screw rod passes through the original bridge box girder plate, the new bridge box girder plate, the perforated steel plate and the rubber pad, the upper and lower ends of the screw rod are anchored by the nuts.
[0012] Preferably, the rubber pad is made of soft polyurethane material.
[0013] Preferably, the ECC cushion layer and the perforated steel plate are connected by protruding anchor bolts.
[0014] Preferably, CFPR grids are evenly arranged inside the ECC cushion layer.
[0015] Preferably, the cross-sectional area of a single CFPR grid is 20 to 30 mm2, the mesh size is 50 mm×50 mm, and 2 to 3 layers are provided.
[0016] Beneficial effects of the utility model:
[0017] 1. By setting CFPR grids between the ECC cushion layer and the asphalt pavement layer of the new bridge box girder, the connection between the ECC cushion layer and the asphalt pavement layer of the new bridge box girder is enhanced, and steel plates are used to strengthen the connection between the new and old box girder slabs, and filled with self-compacting concrete, the connection between the new box girder and the old bridge is effectively improved, and the connection structure between the ECC cushion layer and the perforated steel plate can ensure that the transition interval is smooth and stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 What is shown is a first three-dimensional structural schematic diagram of a highway box girder widening connection structure of the utility model;
[0019] Figure 2 What is shown is a second three-dimensional structural schematic diagram of a highway box girder widening connection structure of the utility model;
[0020] Figure 3 What is shown is a schematic diagram of the first three-dimensional structure inside a highway box girder widening connection structure of the utility model;
[0021] Figure 4 Shown is a schematic diagram of the second three-dimensional structure inside a highway box girder widening connection structure of the utility model.
[0022] Explanation of the reference numerals: 1. original bridge box girder slab; 2. original bridge asphalt pavement layer; 3. new bridge box girder slab; 4. CFPR grille; 5. ECC cushion layer; 6. perforated steel plate; 7. anchor bolt; 8. self-compacting concrete layer; 9. rubber pad; 10. new bridge box girder asphalt pavement layer; 71. screw; 72. nut. DETAILED DESCRIPTION
[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0024] Please refer to ( Figure 1-Figure 4), the utility model provides a highway box girder widening connection structure: a highway box girder widening connection structure, including an original bridge box girder plate 1, the original bridge box girder plate 1 and the new bridge box girder plate 3 are spliced left and right using perforated steel plates 6 and anchor bolts 7, and the interior is filled with a self-compacting concrete layer 8, the surface of the original bridge box girder plate 1 is provided with an original bridge asphalt pavement layer 2, the new bridge box girder plate 3 and the perforated steel plate 6 are covered with a layer of ECC cushion layer 5, the ECC cushion layer 5 has one end embedded in the ECC cushion layer 5, and the other end is embedded in the new bridge box girder asphalt pavement layer 10. The CFPR grille 4 can enhance the connection between the ECC cushion layer 5 and the new bridge box girder asphalt pavement layer 10, and the new bridge box girder asphalt pavement layer 10 is laid on the ECC cushion layer 5.
[0025] Please refer to ( Figure 1-Figure 4 ), in this embodiment, the self-compacting concrete layer 8 is filled in the left and right joints between the original bridge box girder slab 1 and the new bridge box girder slab 3. Specifically, the lower perforated steel plate 6 and the rubber pad 9 are first installed on the lower surface of the original bridge box girder slab 1 and the new bridge box girder slab 3, and fastened by the anchor bolts 7. After the self-compacting concrete layer 8 is cast, the upper perforated steel plate 6 and the rubber pad 9 are installed on the upper surface of the original bridge box girder slab 1 and the new bridge box girder slab 3, and anchored by the anchor bolts 7.
[0026] In this embodiment, the ECC cushion layer 5 has good impermeability, ductility and durability, and can effectively resist vibration, disperse stress and prevent crack expansion, thereby significantly reducing cracking at the joints.
[0027] In this embodiment, one end of the CFPR grille 4 is embedded in the ECC cushion layer 5, and the other end is embedded in the asphalt pavement layer 10 of the new bridge box girder, which can enhance the connection between the ECC cushion layer 5 and the asphalt pavement layer 10 of the new bridge box girder. The cross-sectional area of a single grille is 20 to 30 mm2, the mesh size is 50 mm × 50 mm, and 2 to 3 layers are arranged. During construction, the CFPR grille 4 is placed first, and then the ECC cushion layer 5 is poured. The CFPR grille 4 improves the structural integrity and makes the connection structure more stable.
[0028] In this embodiment, the anchor bolt 7 includes a screw rod 71 and a nut 72 , and the nut 72 and the screw rod 71 are connected and locked with the perforated steel plate 6 through threads.
[0029] In this embodiment, the ECC cushion layer 5 is laid on the perforated steel plate 6, and the perforated steel plate 6 is wrapped in the ECC cushion layer 5, and the thickness of the ECC cushion layer 5 is 6 cm to 8 cm.
[0030] In this embodiment, bolt holes cooperating with the anchor bolts 7 are provided at both ends of the perforated steel plate 6. At least two rows of bolt holes parallel to the edge of the end are provided at each end of the perforated steel plate 6, and the spacing between adjacent bolt holes is 40 cm to 60 cm.
[0031] In this embodiment, the perforated steel plate is 20 mm thick and the rubber pad 9 is 5 mm thick.
[0032] In this embodiment, the chemical adhesive is firstly filled in the box beam plate channel and then the screw rod 71 is installed, and finally the screw rod 71 is locked to the steel plate with the nut 72.
[0033] In this embodiment, a layer of epoxy resin sealant is applied to the gap between the anchor bolt 7 and the perforated steel plate 6 and the surrounding area for waterproof and rust-proof protection.
[0034] During the work, the original bridge box girder plate 1 and the new bridge box girder plate 3 are connected through the perforated steel plate 6. After the perforated steel plate 6 is installed, the anchor bolt 7 is inserted into the perforated steel plate 6, and the screw rod 71 is fixed by tightening the nut 72. The self-compacting concrete layer 8 is injected into the perforated steel plate 6 for reinforcement. After the self-compacting concrete layer 8 solidifies, epoxy resin sealant is injected for waterproof and rust-proof protection to complete the widening connection of the highway box girder.
[0035] Through the above steps, by setting the CFPR grille 4 between the ECC cushion layer 5 and the asphalt pavement layer 10 of the new bridge box girder, the connection between the ECC cushion layer 5 and the asphalt pavement layer 10 of the new bridge box girder is strengthened, and the connection between the new and old box girder plates is strengthened by using the perforated steel plate 6, and filled with the self-compacting concrete layer 8, the connection between the new box girder and the old bridge is effectively improved, and the connection structure between the ECC cushion layer 5 and the perforated steel plate 6 can ensure that the transition interval is smooth and stable.
Claims
1. A highway box girder widening connection structure, comprising an original bridge box girder plate (1), an original bridge asphalt pavement layer (2), a new bridge box girder plate (3), and a CFPR grille (4); characterized in that: The invention also comprises an ECC cushion layer (5), a perforated steel plate (6), anchor bolts (7), a self-compacting concrete layer (8), a rubber pad (9) and a new bridge box girder asphalt pavement layer (10); the surface of the original bridge box girder plate (1) is provided with the original bridge asphalt pavement layer (2); the original bridge box girder plate (1) and the new bridge box girder plate (3) are spliced; the two ends of the perforated steel plate (6) are respectively fixed to the original bridge box girder plate (1) and the new bridge box girder plate (3) by anchor bolts (7); the self-compacting concrete layer (8) is laid on the original bridge box girder plate ( 1), between the new bridge box girder plate (3) and the perforated steel plate (6), the ECC cushion layer (5) is laid on the perforated steel plate (6), and the perforated steel plate (6) is wrapped in the ECC cushion layer (5), the original bridge asphalt pavement layer (2) is laid on the original bridge box girder plate (1), the new bridge box girder asphalt pavement layer (10) is laid on the new bridge box girder plate (3) and wrapped with the ECC cushion layer (5), one end of the CFPR grille (4) is built into the ECC cushion layer (5), and the other end is built into the new bridge box girder asphalt pavement layer (10).
2. The highway box girder widening connection structure according to claim 1, characterized in that: The rubber pad (9) is placed at the top of the original bridge box girder plate (1) and the new bridge box girder plate (3), and the perforated steel plate (6) is placed on the rubber pad (9); the rubber pad (9) is placed at the bottom of the original bridge box girder plate (1) and the new bridge box girder plate (3), and the perforated steel plate (6) is placed under the rubber pad (9).
3. The highway box girder widening connection structure according to claim 1, characterized in that: The anchor bolts (7) penetrate through both sides of the perforated steel plate (6), the rubber pads (9), the original bridge box girder plate (1) and the new bridge box girder plate (3), and anchor the perforated steel plate (6), the rubber pads (9), the original bridge box girder plate (1) and the new bridge box girder plate (3).
4. The highway box girder widening connection structure according to claim 1, characterized in that: The gap between the anchor bolt (7) and the perforated steel plate (6) and the surrounding area are wrapped with a layer of epoxy resin sealant.
5. The highway box girder widening connection structure according to claim 1, characterized in that: The anchor bolt (7) comprises a screw rod (71) and a nut (72) for anchoring the screw rod (71). After the screw rod (71) passes through the original bridge box girder plate (1), the new bridge box girder plate (3), the perforated steel plate (6) and the rubber pad (9), the upper and lower ends of the screw rod (71) are anchored by the nut (72).
6. The highway box girder widening connection structure according to claim 1, characterized in that: The rubber pad (9) is made of soft polyurethane material.
7. The highway box girder widening connection structure according to claim 1, characterized in that: The ECC cushion layer (5) and the perforated steel plate (6) are connected via protruding anchor bolts (7).
8. The highway box girder widening connection structure according to claim 1, characterized in that: CFPR grids (4) are evenly arranged inside the ECC cushion layer (5).
9. The highway box girder widening connection structure according to claim 1, characterized in that: The cross-sectional area of a single CFPR grid (4) is 20 to 30 mm2, the mesh size is 50 mm×50 mm, and 2 to 3 layers are provided.