A new type of connecting expansion device for a widened bridge
By using C50 steel fiber reinforced concrete and a steel frame structure in the expansion joint of the new widened bridge, combined with the design of a water pipe, the problem of drainage difficulties of traditional rubber sealing strips was solved, achieving efficient drainage and structural reinforcement of the bridge.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CCCC SHEC FOURTH ENG
- Filing Date
- 2025-07-24
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional rubber sealing strips are prone to drainage problems in the widening structure of new and old bridges, resulting in poor waterproofing performance.
The structure adopts C50 steel fiber reinforced concrete and steel reinforcement skeleton, combined with water pipe design. The steel reinforcement skeleton is inserted by chiseling open the integral layer and the bridge deck pavement, and steel fibers are randomly distributed in the concrete to prevent the propagation of micro-cracks. At the same time, water pipes are set in the expansion gaps to achieve effective drainage.
It significantly improves the tensile, flexural, impact, and fatigue resistance of concrete, enhances waterproofing, and ensures the structural stability and drainage capacity of the bridge.
Smart Images
Figure CN224494859U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge facility technology, specifically a novel expansion joint device for widening bridges. Background Technology
[0002] Bridge expansion joints are joints installed between the ends of two beams, between a beam end and an abutment, or at hinged joints of the bridge to accommodate bridge deck deformation. Expansion joints must be able to expand and contract freely in both directions parallel and perpendicular to the bridge axis, be robust and reliable, and provide a smooth ride for vehicles without bumps or noise. They must also prevent rainwater and debris from seeping in and causing blockages. Installation, inspection, maintenance, and cleaning should be simple and convenient.
[0003] However, a shear-resistant expansion joint for widening old and new bridges (patent number CN220224918U) addresses the issue that the expansion joint at the bridgehead of the widened bridge is susceptible to damage due to strong shear forces, affecting traffic safety. This solution involves longitudinal expansion joints at the bridgeheads of both the old and new bridges. The structure of these longitudinal expansion joints is as follows: a first stepped groove is formed on the old side, and a second stepped groove is formed on the new side. A first steel fiber reinforced concrete layer and a second steel fiber reinforced concrete layer are poured into the first and second stepped grooves, respectively. A first steel section and a second steel section are arranged opposite each other along the expansion joint's extension direction on the upper part of the adjacent sides of the first and second steel fiber reinforced concrete layers. A rubber sealing strip is embedded between the first and second steel sections. This utility model uses a flexible longitudinal expansion joint. The impact force of vehicles is absorbed and transmitted through a multi-directional displacement system, weakening the transmission of beam vibration and reducing damage to the expansion joint.
[0004] The shear expansion joint between the old and new bridges has the following problems during use: traditional rubber sealing strips are prone to drainage difficulties, resulting in poor waterproofing. Utility Model Content
[0005] The purpose of this utility model is to provide a new type of expansion joint for widening bridges to solve the related problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel expansion joint device for widening bridges, comprising a new bridge abutment, an integrated layer, bridge deck pavement, and C50 steel fiber reinforced concrete. An expansion gap is provided between the new bridge abutment and the old bridge abutment. An integrated layer is provided at the top of the new bridge abutment and the old bridge abutment, and bridge deck pavement is provided at the top of the integrated layer. C50 steel fiber reinforced concrete is poured at the top of the new bridge abutment, and a steel reinforcement skeleton is provided inside the C50 steel fiber reinforced concrete, with anchor bars embedded in the steel reinforcement skeleton.
[0007] This technical solution provides a novel expansion joint device for widening bridges, wherein the new bridge abutment and the old bridge abutment are made of beams.
[0008] This technical solution provides a novel expansion joint device for widening bridges, wherein a special-shaped steel is provided above the C50 steel fiber reinforced concrete, and a waterstop is installed between the side walls of the special-shaped steel.
[0009] This technical solution provides a novel expansion joint device for widening bridges, wherein a water guide pipe connected to the lower part of the waterstop is provided inside the expansion gap.
[0010] This technical solution provides a novel expansion joint device for widening bridges, wherein the distance between the C50 steel fiber reinforced concrete and the integral layer is 32cm.
[0011] Compared with the prior art, this utility model provides a novel expansion joint device for widening bridges, which has the following beneficial effects:
[0012] 1. This utility model involves chiseling open the integral layer and the bridge deck pavement location as a whole, inserting a steel reinforcement skeleton, embedding anchor bars on the steel reinforcement skeleton, and then shaping it by pouring C50 steel fiber concrete. The randomly distributed steel fibers in the C50 steel fiber concrete can effectively inhibit the expansion of micro-cracks and the formation of macro-cracks inside the concrete, significantly improving the tensile, bending, impact and fatigue resistance of the concrete, and giving it good ductility. The water-conducting pipe can guide water to the waterstop location, facilitating drainage. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the front sectional view of the present invention.
[0014] In the diagram: 1. New bridge abutment; 2. Integrated layer; 3. Bridge deck pavement; 4. Water guide pipe; 5. Special-shaped steel; 6. Waterstop strip; 7. Anchor bar; 8. Steel reinforcement cage; 9. C50 steel fiber reinforced concrete; 10. Expansion joint; 11. Old bridge abutment. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0016] Example 1, such as Figure 1As shown, this utility model provides a technical solution: a novel expansion joint device for widening bridges, comprising a new abutment 1, an integrated layer 2, a bridge deck pavement 3, and C50 steel fiber reinforced concrete 9. An expansion gap 10 is provided between the new abutment 1 and the old abutment 11. The integrated layer 2 is provided at the top of the new abutment 1 and the old abutment 11, and the bridge deck pavement 3 is provided at the top of the integrated layer 2. The top of the new abutment 1 is filled with C50 steel fiber reinforced concrete 9, and a steel reinforcement skeleton 8 is provided inside the C50 steel fiber reinforced concrete 9. Anchor bars 7 are embedded in the steel reinforcement skeleton 8. The new abutment 1 and the old abutment 11 are beams. A special-shaped steel 5 is provided above the C50 steel fiber reinforced concrete 9, and the sidewalls of the special-shaped steel 5 are connected... The structure is equipped with a waterstop 6 and an expansion gap 10, which is internally connected to a water guide pipe 4 below the waterstop 6. The distance between the C50 steel fiber concrete 9 and the integral layer 2 is 32cm. The integral layer 2 and the bridge deck pavement 3 are chiseled open as a whole, and a steel reinforcement skeleton 8 is inserted. Anchor bars 7 are embedded on the steel reinforcement skeleton 8. The C50 steel fiber concrete 9 is then poured to shape it. The randomly distributed steel fibers in the C50 steel fiber concrete 9 can effectively prevent the expansion of micro-cracks and the formation of macro-cracks in the concrete, significantly improving the tensile, bending, impact and fatigue resistance of the concrete, and giving it good ductility. The water guide pipe 4 can also guide water and facilitate drainage.
[0017] Working principle: First, the integral layer 2 and the bridge deck pavement 3 are chiseled open as a whole, and a steel reinforcement skeleton 8 is inserted. Anchor bars 7 are embedded in the steel reinforcement skeleton 8. Then, C50 steel fiber concrete 9 is poured to shape it. The randomly distributed steel fibers in the C50 steel fiber concrete 9 can effectively prevent the expansion of micro cracks in the concrete and the formation of macro cracks, significantly improving the tensile, bending, impact and fatigue resistance of the concrete, and giving it good ductility. The water pipe 4 can also play a water guiding role, which facilitates drainage.
[0018] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.
Claims
1. A novel expansion joint for widened bridges, comprising a new bridge abutment (1), an integrated layer (2), a bridge deck pavement (3), and C50 steel fiber reinforced concrete (9), characterized in that: An expansion gap (10) is provided between the new bridge abutment (1) and the old bridge abutment (11). An integrated layer (2) is provided at the top of the new bridge abutment (1) and the old bridge abutment (11), and a bridge deck pavement (3) is provided at the top of the integrated layer (2). C50 steel fiber concrete (9) is poured at the top of the new bridge abutment (1), and a steel reinforcement skeleton (8) is provided inside the C50 steel fiber concrete (9). An anchor bar (7) is embedded on the steel reinforcement skeleton (8).
2. The novel expansion joint device for widening bridges according to claim 1, characterized in that: The new bridge abutment (1) and the old bridge abutment (11) are constructed of beams.
3. The novel expansion joint device for widening bridges according to claim 1, characterized in that: A special-shaped steel (5) is provided above the C50 steel fiber concrete (9), and a waterstop (6) is installed between the side walls of the special-shaped steel (5).
4. The novel expansion joint device for widening bridges according to claim 3, characterized in that: The expansion gap (10) is provided with a water guide pipe (4) connected to the bottom of the waterstop (6).
5. The novel expansion joint device for widening bridges according to claim 1, characterized in that: The distance between the C50 steel fiber reinforced concrete (9) and the integral layer (2) is 32cm.