Bridge prestress reinforcing structure
By setting up support beams and arc beams at the bottom of the bridge plate, and using a tensioning mechanism to avoid the arc beams extending outward, the problem of traffic affected when the old bridge is reinforced is solved, the load-bearing capacity and structural stability of the bridge are improved, and the load-bearing capacity and structural stability of the bridge are reduced. Safety hazards.
Patent Information
- Application Number
- CN202420823878.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-04-18
AI Technical Summary
The existing old bridge reinforcement method will affect traffic during construction, and the design allowance of the pile foundation part is large but does not require reinforcement, resulting in inconvenience in reinforcement.
The supporting beam is installed at the bottom of the bridge plate, and the columns are connected through support seats. The columns are fixed with the bridge pier and pile foundation. The top tightening bolts provide prestress to increase the load capacity of the bridge plate, and the arc beam and tensioning mechanism avoid the arc beams. Extend outward to ensure the stability of the bridge pier structure.
The advantage of bridge reinforcement not affecting traffic is achieved, the maximum load-bearing capacity of the bridge is improved, safety hazards are reduced, and the stability and safety of the reinforced bridge structure are ensured by increasing the load capacity of the support seat.
Smart Images
Figure CN222139821U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a prestressed reinforcement structure of a bridge. Background Art
[0002] There are still a large number of relatively small old bridges that were built decades ago, mainly distributed on rural roads, with a maximum design load of no more than 30 tons, including multiple piers, pile foundations at the bottom of the piers, bridge decks between two piers, and the ends of the bridge decks fixed to the tops of the piers. Many old bridges have been working at close to or even full capacity for a long time, which is prone to safety hazards, and more and more old bridges are facing the need for reinforcement.
[0003] The reinforcement method of existing old bridges is usually to first complete the reinforcement of the bridge piers, and then set up a layer of poured reinforced concrete on the basis of the original bridge deck to reinforce the original bridge. The design margin of the pile foundation is relatively large and generally does not need to be reinforced again. Of course, this depends on the specific situation. Under the reinforcement method of existing old bridges, since construction needs to be carried out on the passage surface of the bridge deck, it will cause great inconvenience to local traffic. Utility Model Content
[0004] The purpose of the utility model is to provide a prestressed reinforcement structure for a bridge. The utility model has the advantage of not affecting the traffic on the bridge during the reinforcement construction.
[0005] The technical solution of the utility model is as follows: a prestressed reinforcement structure of a bridge, the bridge comprises a plurality of piers, pile foundations are arranged at the bottom of the piers, a bridge deck is arranged between two piers, the reinforcement structure comprises a support beam located at the bottom of the bridge deck, a support seat is arranged below the support beam, a plurality of upwardly tightening bolts are arranged on the support seat, the upper ends of the tightening bolts tighten the support beam, downwardly extending columns are arranged at both ends of the support seat, the lower ends of the columns are fixed to the corresponding pile foundations, and one side of the columns is fixed to the corresponding piers.
[0006] In the aforementioned prestressed reinforcement structure of the bridge, the support seat includes a base beam located below the support beam, the base beam is provided with a plurality of tightening bolts that are tightened upward, an arc-shaped beam is provided below the base beam, the middle part of the arc-shaped beam is arched upward, the arc-shaped beam is connected to the base beam through a plurality of support columns, and the two ends of the arc-shaped beam are connected to corresponding columns.
[0007] In the aforementioned prestressed reinforcement structure of the bridge, a tensioning mechanism is provided on the lower side of the arc-shaped beam, and both ends of the arc-shaped beam are tensioned by the tensioning mechanism.
[0008] In the aforementioned prestressed reinforcement structure of the bridge, the tensioning mechanism includes a first support and a second support respectively welded to the two ends of the arc beam, a steel cable is arranged between the first support and the second support, one end of the steel cable is connected to the first support, and the other end of the steel cable is provided with a threaded sleeve, and a tensioning bolt connected to the second support is arranged in the threaded sleeve.
[0009] In the aforementioned bridge prestressed reinforcement structure, a locking nut is provided on the tensioning bolt.
[0010] In the aforementioned prestressed bridge reinforcement structure, the support beam is located in the middle of the bridge deck.
[0011] Compared with the prior art, the utility model sets a support beam at the bottom of the bridge deck. The support beam is connected to the column through the support seat. The column is connected to the bridge pier and the pile foundation, providing an upward support force for the support seat. The support beam is tightened upward by the bolts on the support seat, so that the support beam has an upward prestress, which reduces the deadweight load of the bridge deck, and when the bridge deck is under pressure, it receives additional support, the maximum load-bearing capacity of the bridge is increased, the bridge is reinforced, and the safety hazard is reduced. Since the reinforcement structure is installed on the lower side of the bridge deck, vehicles can still pass on the bridge when the bridge is reinforced, and the traffic is not affected. Therefore, the utility model has the advantage of not affecting the bridge traffic during the construction and reinforcement.
[0012] In addition, through further improvements to the support seat, the load capacity of the support seat is increased by using a curved beam, and the two ends of the curved beam are tightened by steel cables to prevent the two ends of the curved beam from extending outward under the action of the load force, and to avoid generating horizontal thrust on the piers, thereby ensuring the structural stability of the piers and further ensuring the safety of the reinforced bridge. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a front view schematic diagram of the utility model.
[0014] Figure 2 yes Figure 1 Enlarged view at A.
[0015] The markings in the attached drawings are: 1-bridge pier, 2-pile foundation, 3-bridge deck, 4-support beam, 5-tightening bolt, 6-column, 7-base beam, 8-arc beam, 9-support column, 10-first support, 11-second support, 12-steel cable, 13-threaded sleeve, 14-tightening bolt, 15-locking nut. DETAILED DESCRIPTION
[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.
[0017] Example. Prestressed reinforcement structure of bridge, such as Figure 1 As shown, the bridge includes a plurality of piers 1, a pile foundation 2 is provided at the bottom of the piers 1, a bridge deck 3 is provided between two piers 1, two reinforcement structures are provided at the bottom of the bridge deck 3, the distance between the two reinforcement structures is preferably half of the width of the bridge deck 3, and the reinforcement structure as a whole is a steel frame structure.
[0018] The reinforcement structure includes a support beam 4 fixed at the bottom of the plate 3. The length of the support beam 4 is parallel to the length of the bridge plate. The length of the support beam 4 is about half of the length of the bridge plate 3. The support beam 3 is located in the middle of the length of the bridge plate 3.
[0019] A support seat is provided below the support beam 4, and the support seat includes a base beam 7 located below the support beam 4, and a plurality of upwardly tightening bolts 5 are provided on the base beam 7, and the upper ends of the tightening bolts 5 press the support beam 4 tightly, and an arc-shaped beam 8 is provided below the base beam 7, and the middle part of the arc-shaped beam 8 is arched upward, and the arc-shaped beam 8 is connected to the base beam 7 through a plurality of support columns 9, and both ends of the arc-shaped beam 8 are provided with downwardly extending columns 6, and the columns 6 are welded to the arc-shaped beam 8, and the lower ends of the columns 6 are fixed to the corresponding pile foundation 2, and the lower ends of the columns 6 can be provided with a support plate to increase the contact area with the pile foundation 2, and one side of the column 6 is fixed to the corresponding pier 1 through a plurality of expansion bolts.
[0020] A tensioning mechanism is provided at the lower side of the arc-shaped beam 8, and the two ends of the arc-shaped beam 8 are tensioned by the tensioning mechanism. The tensioning mechanism comprises a first support 10 and a second support 11 respectively welded at the two ends of the arc-shaped beam 8, a steel cable 12 is provided between the first support 10 and the second support 11, one end of the steel cable 12 is connected to the first support 10, and the other end of the steel cable 12 is provided with a threaded sleeve 13, a tensioning bolt 14 connected to the second support 11 is provided in the threaded sleeve 13, a locking nut 15 is provided on the tensioning bolt 14, the locking nut 15 is located between the second support 11 and the threaded sleeve 13, and the locking nut 15 prevents the threaded sleeve 13 and the tensioning bolt 14 from axial movement.
[0021] In the support seat, first rotate the tightening bolt 14 to tighten the curved beam 8, and then weld the two ends of the curved beam 8 to the column 6. This can prevent the two ends of the curved beam 8 from moving outward when compressed, and can also prevent the two ends of the curved beam 8 from moving inward when tightened, thereby avoiding horizontal force on the pier 1 and improving the safety of the bridge.
[0022] After the reinforcement mechanism is installed on the bridge, the support beam 4 is tightened by the tightening bolts 5, so that the bridge deck 3 has an upward prestress, reducing the deadweight of the bridge deck 3, thereby improving the load capacity of the bridge deck 3. Since the middle part of the bridge deck 3 is supported, the length of the bending arm of the bridge deck 3 is shortened, and the load capacity of the bridge deck 3 is increased, that is, the overall load-bearing capacity of the bridge is increased.
[0023] The embodiment is suitable for renovating old bridges with a designed maximum load-bearing capacity of no more than 30 tons. After the renovation, the maximum load-bearing capacity can be increased by about 25%. Most of the parts can be prefabricated in the workshop, and the renovation speed is fast and the renovation cost is relatively low. If a larger increase is required, other reinforcement measures need to be further added.
Claims
1. A prestressed reinforcement structure for a bridge, the bridge comprising a plurality of piers (1), a pile foundation (2) being provided at the bottom of each pier (1), and a bridge deck (3) being provided between two piers (1), characterized in that: The reinforcement structure comprises a support beam (4) located at the bottom of the bridge deck (3), a support seat is provided below the support beam (4), a plurality of upwardly tightening bolts (5) are provided on the support seat, the upper ends of the tightening bolts (5) press against the support beam (4), and columns (6) extending downward are provided at both ends of the support seat, the lower ends of the columns (6) are fixed to the corresponding pile foundation (2), and one side of the columns (6) is fixed to the corresponding bridge pier (1).
2. The prestressed reinforcement structure for bridges according to claim 1, characterized in that: The support seat comprises a base beam (7) located below the support beam (4), a plurality of upwardly tightening bolts (5) are provided on the base beam (7), an arc-shaped beam (8) is provided below the base beam (7), the middle portion of the arc-shaped beam (8) is arched upward, the arc-shaped beam (8) is connected to the base beam (7) via a plurality of support columns (9), and the two ends of the arc-shaped beam (8) are connected to corresponding columns (6).
3. The prestressed reinforcement structure for bridges according to claim 2, characterized in that: A tensioning mechanism is provided on the lower side of the arc-shaped beam (8), and both ends of the arc-shaped beam (8) are tensioned by the tensioning mechanism.
4. The prestressed reinforcement structure for a bridge according to claim 3, characterized in that: The tensioning mechanism comprises a first support (10) and a second support (11) respectively welded to the two ends of the arc-shaped beam (8); a steel cable (12) is arranged between the first support (10) and the second support (11); one end of the steel cable (12) is connected to the first support (10); the other end of the steel cable (12) is provided with a screw sleeve (13); a tensioning bolt (14) connected to the second support (11) is arranged inside the screw sleeve (13).
5. The prestressed reinforcement structure for bridges according to claim 4, characterized in that: The tension bolt (14) is provided with a locking nut (15).
6. The prestressed reinforcement structure for a bridge according to claim 4, characterized in that: The support beam (4) is located in the middle of the bridge deck (3).