Steel bar frame of bridge end transition slab
By improving the design of the steel reinforcement frame of the bridge abutment slab and adopting cross-connection and stirrup reinforcement, the problems of stability and uneven connection of the steel reinforcement frame during construction were solved, thereby improving the stability and durability of the bridge abutment slab.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-07
- Publication Date
- 2026-04-07
AI Technical Summary
The existing steel frame of the bridge approach slab has problems such as loose stirrup binding, poor steel structure stability, insufficient anchorage strength, and uneven concrete connection during construction, which leads to construction quality and safety hazards.
The main steel reinforcement and bridge abutment steel reinforcement structure adopts an interlocking integral configuration. The bridge abutment slab steel reinforcement frame is designed by cross connection. The frame is made using square or equilateral rhomboid grids to increase the anchorage strength and connection stability of the stirrups. Anchor bolts are installed in the concrete to enhance seismic resistance.
It improved the overall structural stability and durability of the bridge approach slab, reduced safety hazards, and ensured the smooth progress of construction and the long-term stability of the bridge.
Smart Images
Figure CN224092302U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the construction engineering technical field of bridge head apron, and particularly relates to a reinforced frame of bridge head apron. BACKGROUND
[0002] In the design and construction of a bridge, the bridge abutment foundation is buried deep, so it can be used as a rigid structure, and in use, it can be considered not to sink. However, the two ends of the bridge are mostly filled with soil, and the settlement is much greater than that of the bridge abutment. In order to reduce the settlement difference and the transition of rigidity and flexibility, and prevent the vehicle from jumping, a bridge head apron should be set on the back of the bridge abutment.
[0003] The bridge head apron is a load-bearing plate connecting the bridge abutment and the road approach. One end of the bridge head apron is placed on the bridge abutment, and the other end is placed on the base layer of the road approach, which is used to prevent the settlement of the bridge end connecting part. The bridge head apron is also called a bridge cover plate mold, which is placed between the bridge abutment or cantilever beam plate end and the filled soil. It can rotate with the settlement of the filled soil. When uneven settlement occurs, the bridge head apron can play a transition role, so that even if the backfill of the abutment settles, it will not produce unevenness. In addition, as a buffer between the bridge abutment and the road approach, the bridge head apron can play a buffering role when vehicles are driving, which can reduce the impact on vehicles and the bridge abutment, prevent the vehicle from jumping at the bridge head, and the bridge abutment apron is particularly suitable for urban roads and high-grade highways with high driving requirements. The embankment under the bridge head apron can be provided with drainage structures.
[0004] The bridge head apron is usually made of prefabricated reinforced concrete, in which the steel bars form a net structure in the concrete to enhance the compressive and bending resistance of the concrete. However, the existing apron reinforced frame has the following shortcomings in the construction process of the bridge head apron:
[0005] 1. The stirrups are not firmly tied. The steel wire used for tying is too hard or not properly thick, and the framework is prone to deformation during sinking into the formwork groove, resulting in slippage and skew of the stirrups;
[0006] 2. The length of the flat section of the stirrup hook head is insufficient, and the anchoring strength is not enough;
[0007] 3. During the tying process, the spacing of the longitudinal or transverse steel bars is not reasonable, and the structural stability between the steel bars is poor after the tying operation, and the overall structure of the steel bars is prone to deformation or twisting;
[0008] 4. The anchoring position of the anchor nail is not reasonable, resulting in uneven stress on the reinforced concrete structure, reducing the fixing capacity and shear bearing capacity of the reinforced concrete structure, and causing safety hazards to the construction quality of the bridge head apron. SUMMARY
[0009] In view of this, the purpose of the utility model lies in designing a steel reinforcement frame of bridge head approach slab, adopting main reinforcement and bridge head reinforcement structure of mutually successive integral configuration, improving steel reinforcement frame manufacturing method, adopting cross connection mode for frame design and manufacturing, ensuring the spacing stability between each unit of steel reinforcement frame, improving the overall structural stability of steel reinforcement frame, thereby improving the stability and durability of bridge head approach slab, and reducing safety hazards.
[0010] The utility model provides a kind of steel reinforcement frame of bridge head approach slab, comprising: the main reinforcement for constituting bridge head approach slab frame, and the joint reinforcement for connecting bridge head, the joint reinforcement is arranged at the connecting place of bridge head approach slab and bridge head, the main reinforcement is embedded in the bridge head approach slab, the main reinforcement includes the multiple groups of transverse reinforcement and longitudinal reinforcement that are arranged in orthogonal cross connection in horizontal direction;The joint reinforcement includes multiple groups of joint transverse reinforcement and joint longitudinal reinforcement that are arranged in cross connection in horizontal direction, the joint longitudinal reinforcement is connected with the longitudinal reinforcement at the connecting place of the bridge head approach slab and the bridge head and is integrated.
[0011] Specifically, the steel reinforcement frame adopts horizontal direction cross connection configuration for frame design and manufacturing, which can improve the shear force bearing capacity of the overall structure of the steel reinforcement frame in the horizontal direction, avoid the movement, sliding and displacement of the bridge head due to long-term vehicle load, and ensure the high structural stability between each group of transverse and longitudinal reinforcement in the horizontal direction based on the similar or same shape and size of each unit of cross connection.
[0012] Preferably, the main reinforcement is 2.5-3 times the extension distance of the joint reinforcement in the horizontal direction. The length of the bridge head approach slab has a direct impact on the structural characteristics of the bridge head, and the length ratio of the main reinforcement and the joint reinforcement of the steel reinforcement frame can make the stress in the longitudinal and transverse directions of the connecting place of the bridge head approach slab and the bridge head uniform, without distortion and deformation. In addition, reasonable approach slab length can also ensure smooth construction and avoid unnecessary increase in the length of the bridge.
[0013] Preferably, the distance between the upper edge of the steel reinforcement frame and the upper edge of the concrete in the vertical direction, and the distance between the lower edge of the steel reinforcement frame and the lower edge of the concrete, are both one third of the height of the steel reinforcement frame. Designing the vertical up-down edge distance between the steel reinforcement frame and the concrete as a specific ratio of the height of the steel reinforcement frame ensures the connection strength and structural stability of the reinforced concrete structure in the vertical direction, and avoids cracking or peeling of the concrete at the up-down edge due to weakened connection.
[0014] Preferably, the distance between the horizontal side edge of the reinforcing steel frame and the side edge of the concrete is one-quarter of the spacing between adjacent transverse and longitudinal reinforcing bars. Designing the horizontal lateral edge distance between the reinforcing steel frame and the concrete to a specific ratio of the spacing between the transverse and longitudinal reinforcing bars ensures the horizontal connection strength and structural stability of the reinforced concrete structure, preventing cracking or peeling of the concrete at the lateral edges due to weakened connections.
[0015] Preferably, the diameter of the transverse reinforcement and the transverse reinforcement of the joint is larger than that of the longitudinal reinforcement and the longitudinal reinforcement of the joint, respectively. This design ensures that the steel frame maintains uniform and balanced structural stability in the transverse and longitudinal directions.
[0016] Preferably, the diameter of the transverse reinforcement and the transverse reinforcement of the joint is φ20mm, and the diameter of the longitudinal reinforcement and the longitudinal reinforcement of the joint is φ16mm.
[0017] Furthermore, at the outer perimeter of the main reinforcing bars and the joint reinforcing bars, multiple sets of evenly spaced stirrups and joint stirrups are tied or welded together in a direction parallel to the vertical section to enclose and reinforce the reinforcing bar structure. Each stirrup and joint stirrup is a closed square ring structure.
[0018] Preferably, the diameter of the stirrups and the joint stirrups is not less than one-quarter of the diameter of the main reinforcement and the joint reinforcement, respectively. Since the transverse and longitudinal reinforcements of the main reinforcement and the joint reinforcement, as well as the transverse and longitudinal reinforcements of the joint, are interconnected, they only form an internal reinforcement bar structure, lacking external restraint, making the structure unstable. Adding stirrups to the periphery of the reinforcement bar structure for enclosure and reinforcement tightens and brings the outlines of the main reinforcement and the joint reinforcement closer together. Under stress, this restrains and limits the outward movement of the reinforcement bar structure, improving the overall structural strength of the reinforcement frame. This ensures that the reinforcement structure remains stable under stress (such as during hoisting), preventing bending and deformation.
[0019] Furthermore, both the stirrups and the joint stirrups include consecutive straight sections and two hook heads. The two hook heads are respectively located at both ends of the straight sections. Both the hook heads and the straight sections are embedded in the concrete. The two hook heads converge and wrap around the straight sections to fix them in place.
[0020] Preferably, the length of the straight section is at least 10 times the diameter of the stirrup. The hook head and the length of the straight section of the stirrup directly determine the anchorage strength of the stirrup in the concrete. In actual construction, insufficient stirrup length often results in an insufficient straight section length, which reduces the anchorage strength and the connection strength between the steel bar and the concrete. This invention ultimately determines the length of the straight section of the stirrup to be no less than 10 times the diameter of the wire, thereby improving the anchorage strength and ensuring that the stirrup is firmly anchored in the concrete structure. The two hook heads are wrapped and fixed together after forming a closed square ring structure in the straight section, ensuring the structural stability of the stirrup.
[0021] Furthermore, a lapped reinforcement is provided at the connection between the main reinforcement and the joint reinforcement. The lapped reinforcement overlaps with both the main reinforcement and the joint reinforcement, and the overlapping section is tied and fixed to the main reinforcement and the joint reinforcement.
[0022] Specifically, the diameter of the lapped reinforcing bars can be equal to or slightly smaller than that of the main reinforcing bars and the splice reinforcing bars. The lapped reinforcing bars can serve as part of the transition between the main reinforcing bars and the splice reinforcing bars, further increasing the number of connection points, increasing the connection density, and improving the strength and reliability of the connection. Specifically, by binding or welding the lapped reinforcing bars to the main reinforcing bars and the splice reinforcing bars, the main reinforcing bars and the splice reinforcing bars can more firmly form a complete and integrated reinforcing steel structure.
[0023] Furthermore, the cross-sectional configuration of the joint reinforcement in the horizontal direction is an equilateral rhomboid grid, and the cross-sectional configuration of the main reinforcement in the horizontal direction is a square grid.
[0024] The horizontal spacing between adjacent transverse and longitudinal reinforcing bars is equal, and the horizontal spacing between adjacent joint transverse and longitudinal reinforcing bars is also equal, achieving an even distribution of the reinforcing steel structure within the bridge approach slab. This enables the bridge approach slab concrete structure to uniformly bear and transmit various loads, such as vibration, gravity, and wind force.
[0025] Furthermore, both the main reinforcing bars and the joint reinforcing bars have a square grid cross-sectional configuration in the vertical direction.
[0026] That is, the spacing between adjacent transverse and longitudinal reinforcing bars, as well as the spacing between adjacent joint transverse and longitudinal reinforcing bars, are all the same as the overall height of the reinforcing steel frame. Compared with the traditional vertical rectangular grid cross-section, the square grid cross-section further improves the load-bearing capacity in the vertical (up and down) direction. Under the heavy load of long-term vehicle traffic, it can ensure that the reinforcing steel frame will not dent or flatten. Furthermore, the square cross-section also helps to standardize material specifications, simplify material preparation and manufacturing processes, and reduce production costs.
[0027] Furthermore, the transverse reinforcing bars and the longitudinal reinforcing bars of the joint intersect obliquely in the horizontal direction.
[0028] The transverse and longitudinal reinforcing bars of the joint are diagonally intersecting in the horizontal plane, meaning the bridge abutment slab is designed at an angle. Compared to a right angle, an angled bridge abutment slab can more effectively distribute and transfer loads. In fabricating the angled bridge abutment slab reinforcement frame, this invention accurately calculates the aforementioned angle to ensure it can withstand a predetermined load. The choice of the angle of inclination of the bridge abutment slab directly affects the stability and load-bearing capacity of the bridge abutment structure; correctly understanding and applying these angles plays a crucial role in ensuring the safety and stability of the bridge abutment. Preferably, the intersecting angle is 60°.
[0029] Furthermore, the steel reinforcement frame of the bridge approach slab also includes: anchor bolts, which are located on the inner side of the outer contour of the steel reinforcement frame, near the intersection of the transverse reinforcement or joint transverse reinforcement and the longitudinal reinforcement or joint longitudinal reinforcement. The anchor bolts are fixedly connected to the steel reinforcement frame, and the bolt body is embedded in the concrete structure.
[0030] The main functions of anchor bolts are to enhance the overall seismic resistance of reinforced concrete structures, improve their fatigue resistance, accommodate structural deformation, and increase structural redundancy. During strong vibrations, anchor bolts effectively limit the displacement of structural members, reducing the degree of damage. In bridge structures, anchor bolts prevent excessive relative displacement between piers and the superstructure, thus ensuring the overall stability of the bridge. Furthermore, seismic anchors can strengthen the frame structure of buildings, such as the connection of nodes, enabling better coordination between nodes under strong vibrations. In bridge construction, seismic anchors primarily function as seismic resistors, ensuring the integrity of the concrete and the uniformity of compressive stress in the pier cap support pad. They prevent loosening or separation under normal use and external forces such as earthquakes, ensuring a firm connection of the structure. For bridge structures subjected to long-term dynamic loads, they can reduce fatigue damage caused by vibration, extending the service life of the structure. Moreover, anchor bolts have a certain deformation capacity, maintaining effective anchoring even with minor structural deformation, preventing premature failure. Even if some anchors are damaged in an earthquake, the others can still continue to function, providing the structure with a certain degree of seismic resistance and increasing the structure's safety.
[0031] Compared with the prior art, the beneficial effects of the steel reinforcement frame of the bridge approach slab of this utility model are as follows:
[0032] The steel frame structure of the bridge approach slab provided by this utility model is simple and reasonable, with strong integrity. It adopts the main steel bars and bridge approach steel bars of the integral configuration that are connected to each other. It improves the steel frame construction method and adopts the cross-connected square or equilateral rhomboid grid for frame design and construction. This ensures the stability of the spacing between each unit of the steel frame, improves the overall structural stability of the steel frame, and thus improves the stability and durability of the bridge approach slab and reduces safety hazards. Attached Figure Description
[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0034] Figure 1 This is a schematic diagram of the planar structure of the steel reinforcement frame of the bridge approach slab according to an embodiment of the present utility model;
[0035] Figure 2 This is a schematic diagram of the AA cross-sectional structure of the steel frame of the bridge approach slab according to an embodiment of the present utility model.
[0036] Figure 3 This is a schematic diagram showing the wire diameters of the transverse reinforcing bars, longitudinal reinforcing bars, joint longitudinal reinforcing bars, joint transverse reinforcing bars, and lapped reinforcing bars in an embodiment of this utility model.
[0037] The markings in the attached figure are as follows:
[0038] 1. Horizontal reinforcement, 2. Longitudinal reinforcement, 3. Longitudinal reinforcement at joints, 4. Horizontal reinforcement at joints, 5. Lap reinforcement, 6. Stirrups, 7. Stirrups at joints, 8. Anchor bolts. Detailed Implementation
[0039] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0040] In the description of this utility model, it should be noted that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0042] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings:
[0043] This utility model embodiment provides a steel reinforcement frame for a bridge abutment slab, such as... Figure 1 , 2As shown, the structure includes main reinforcing bars for forming the bridge approach slab frame and splice reinforcing bars for connecting the bridge approach. The splice reinforcing bars are located at the connection between the bridge approach slab and the bridge approach. The main reinforcing bars are embedded in the bridge approach slab. The main reinforcing bars include multiple sets of transverse reinforcing bars 1 and longitudinal reinforcing bars 2 orthogonally connected in the horizontal plane. The splice reinforcing bars include multiple sets of splice transverse reinforcing bars 4 and splice longitudinal reinforcing bars 3 orthogonally connected in the horizontal plane. The splice longitudinal reinforcing bars 3 and longitudinal reinforcing bars 2 are connected as one unit at the connection between the bridge approach slab and the bridge approach. The use of a horizontally cross-connected configuration in the frame design and fabrication of the reinforcing steel frame improves the overall shear strength capacity of the reinforcing steel frame structure in the horizontal direction, preventing the bridge approach from moving, sliding, or shifting due to long-term vehicle traffic loads. This is because each unit based on the cross-connection has similar or identical shape and size, and it also ensures high structural stability in the horizontal direction between each set of transverse and longitudinal reinforcing bars. The horizontal extension distance of the main reinforcing bars is 2.5-3 times the horizontal extension distance of the splice reinforcing bars. This ratio of the length of the main reinforcing bars to the length of the splice reinforcing bars in the steel frame ensures uniform longitudinal and transverse stress at the connection between the bridge abutment slab and the bridge abutment, preventing twisting and deformation, ensuring smooth construction, and avoiding unnecessary increases in bridge length. The vertical distances between the upper edge of the steel frame and the upper edge of the concrete, and between the lower edge of the steel frame and the lower edge of the concrete, are both one-third of the height of the steel frame itself. Designing the vertical upper and lower edge distances of the steel frame to the concrete as a specific ratio of the height of the steel frame ensures the vertical connection strength and structural stability of the reinforced concrete structure, preventing cracking or peeling of the concrete at the upper and lower edges due to weakened connections. The distance between the horizontal lateral edge of the reinforced concrete frame and the lateral edge of the concrete is one-quarter of the spacing between adjacent transverse reinforcement 1 and longitudinal reinforcement 2. Designing the horizontal lateral edge distance between the reinforced concrete frame and the concrete to a specific ratio of the spacing between transverse reinforcement 1 and longitudinal reinforcement 2 ensures the connection strength and structural stability of the reinforced concrete structure in the horizontal direction, preventing cracking or peeling of the concrete at the lateral edge due to weakened connections. The diameter of transverse reinforcement 1 and the transverse reinforcement 4 at the joint is larger than the diameter of longitudinal reinforcement 2 and the longitudinal reinforcement 3 at the joint, respectively, ensuring that the reinforced concrete frame maintains uniform and balanced structural stability in both the transverse and longitudinal directions. In this embodiment (e.g....), Figure 3 As shown in the figure, the diameter of the transverse reinforcement 1 and the transverse reinforcement 4 of the joint is φ20mm, and the diameter of the longitudinal reinforcement 2 and the longitudinal reinforcement 3 of the joint is φ16mm.
[0044] The horizontal cross-sectional configuration of the joint reinforcement is an equilateral rhomboid grid, while the horizontal cross-sectional configuration of the main reinforcement is a square grid. The horizontal spacing between adjacent transverse and longitudinal reinforcement bars is equal, as is the horizontal spacing between adjacent joint transverse and longitudinal reinforcement bars. The reinforcement structure is evenly distributed within the bridge abutment slab, allowing for uniform bearing and transfer of various loads on the bridge abutment slab concrete structure. The vertical cross-sectional configuration of both the main reinforcement and joint reinforcement bars is a square grid, meaning the spacing between adjacent transverse and longitudinal reinforcement bars, as well as the spacing between adjacent joint transverse and longitudinal reinforcement bars, is the same as the overall height of the reinforcement frame. The square grid cross-section provides excellent vertical load-bearing capacity, ensuring the reinforcement frame does not dent or flatten under prolonged vehicle traffic loads. Furthermore, the square cross-section helps standardize material specifications, simplifying material preparation and fabrication processes, and reducing manufacturing costs. The transverse reinforcement 4 and the longitudinal reinforcement 3 of the joint intersect obliquely in the horizontal plane, meaning the bridge abutment slab is designed at an angle. Compared to a right angle, an angled bridge abutment slab can more effectively distribute and transfer loads. In this embodiment, when constructing the angled bridge abutment slab reinforcement frame, the intersection angle of the oblique cross is calculated to be 60° to withstand the predetermined load.
[0045] Multiple sets of evenly spaced stirrups 6 and joint stirrups 7 are tied or welded around the periphery of the main reinforcing bars and joint reinforcing bars, parallel to the vertical section, to enclose and reinforce the reinforcing bar structure. Each stirrup 6 and joint stirrup 7 is a closed square ring structure. The diameter of the stirrups 6 and joint stirrups 7 is not less than one-quarter of the diameter of the main reinforcing bars and joint reinforcing bars. Because the transverse reinforcing bars 1 and longitudinal reinforcing bars 2, and the transverse reinforcing bars 4 and longitudinal reinforcing bars 3 of the main reinforcing bars and joint reinforcing bars are interconnected, they only form an internal reinforcing bar structure, lacking external restraint, and the structure is still very unstable. Adding stirrups around the reinforcing bar structure for enclosure and reinforcement tightens and brings the outlines of the main reinforcing bars and joint reinforcing bars closer together. Under stress, this restrains and limits the outward movement of the reinforcing bar structure, improves the overall structural strength of the reinforcing frame, and enables the reinforcing bar structure to maintain structural stability under stress (such as during hoisting), avoiding bending and deformation. Both stirrup 6 and splice stirrup 7 include consecutive straight sections and two hooks. The two hooks are located at both ends of the straight section, and both the hooks and the straight section are embedded in the concrete. The two hooks converge and are fixed together after enclosing the straight section. The length of the hooks and the straight section of the stirrup directly determines the anchorage strength of the stirrup in the concrete. In this embodiment, the length of the straight section of the stirrup is ultimately determined to be no less than 10 times the wire diameter, which improves the anchorage strength and ensures that the stirrup is firmly anchored in the concrete structure. The two hooks are wrapped together after enclosing the straight section to form a closed square ring structure, ensuring the structural stability of the stirrup.
[0046] A lapped reinforcing bar 5 is also provided at the connection between the main reinforcing bar and the joint reinforcing bar. The lapped reinforcing bar 5 overlaps with both the main reinforcing bar and the joint reinforcing bar, and the overlapping section is tied and fixed to the main reinforcing bar and the joint reinforcing bar. Figure 3 As shown, the diameter of the lapped reinforcing bar 5 is equal to or slightly smaller than that of the main reinforcing bar and the splice reinforcing bar. As part of the transition between the main reinforcing bar and the splice reinforcing bar, the lapped reinforcing bar 5 further increases the connection points, increases the connection density, and improves the strength and reliability of the connection. The lapped reinforcing bar 5 is tied or welded to the main reinforcing bar and the splice reinforcing bar, making the main reinforcing bar and the splice reinforcing bar more firmly form a complete and integrated reinforcing bar structure.
[0047] like Figure 1 As shown, the steel reinforcement frame of the bridge approach slab also includes anchor bolts 8. Anchor bolts 8 are located inside the outer contour of the steel reinforcement frame, near the intersection of transverse reinforcement 1 or the joint of transverse reinforcement 4 and longitudinal reinforcement 2 or the joint of longitudinal reinforcement 3. Anchor bolts 8 are fixedly connected to the steel reinforcement frame, and their bodies are embedded in the concrete structure. Anchor bolts 8 can enhance the overall seismic resistance of the reinforced concrete structure, improve its fatigue resistance, accommodate structural deformation, and increase structural redundancy. During strong vibrations, anchor bolts 8 effectively limit the displacement of structural members, reducing the degree of structural damage. In bridge structures, anchor bolts 8 prevent excessive relative displacement between the piers and the bridge superstructure, thereby ensuring the overall stability of the bridge.
[0048] The steel frame structure of the bridge approach slab in this embodiment is simple and reasonable, with strong integrity. It adopts the main steel reinforcement and bridge approach steel reinforcement structure with interconnected integral configuration, improves the steel frame fabrication method, and uses cross-connected square or equilateral rhomboid grids for frame design and fabrication, which ensures the stability of the spacing between each unit of the steel frame and improves the overall structural stability of the steel frame.
[0049] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.
[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A steel reinforcement frame for a bridge abutment slab, characterized in that, include: The main reinforcing bars are used to form the bridge approach slab frame, and the joint reinforcing bars are used to connect the bridge approach. The joint reinforcing bars are set at the connection between the bridge approach slab and the bridge approach. The main reinforcing bars are embedded in the bridge approach slab. The main reinforcing bars include multiple sets of transverse and longitudinal reinforcing bars orthogonally connected in the horizontal plane. The joint reinforcing bars include multiple sets of joint transverse and joint longitudinal reinforcing bars orthogonally connected in the horizontal plane. The joint longitudinal reinforcing bars and the longitudinal reinforcing bars are connected together at the connection between the bridge approach slab and the bridge approach.
2. The steel reinforcement frame for the bridge abutment slab according to claim 1, characterized in that, Around the outline of the main steel bars and joint steel bars, multiple sets of evenly spaced stirrups and joint stirrups are tied or welded together in a direction parallel to the vertical section to enclose and reinforce the steel structure. Each stirrup and joint stirrup is a closed square ring structure.
3. The steel reinforcement frame for the bridge abutment slab according to claim 2, characterized in that, The stirrups and joint stirrups each include consecutive straight sections and two hook heads. The two hook heads are respectively located at both ends of the straight sections. Both the hook heads and the straight sections are embedded in the concrete. The two hook heads are joined together and fixed after the straight sections are closed.
4. The steel reinforcement frame for the bridge abutment slab according to claim 2, characterized in that, The connection between the main steel bar and the joint steel bar is also provided with a lapped steel bar. The lapped steel bar has an overlapping section with both the main steel bar and the joint steel bar. The overlapping section is tied and fixed to the main steel bar and the joint steel bar.
5. The steel reinforcement frame for the bridge abutment slab according to claim 1, characterized in that, The cross-sectional shape of the joint reinforcement in the horizontal direction is an equilateral rhomboid grid, and the cross-sectional shape of the main reinforcement in the horizontal direction is a square grid.
6. The steel reinforcement frame for the bridge abutment slab according to claim 1, characterized in that, Both the main reinforcing bars and the joint reinforcing bars have a square grid cross-section in the vertical direction.
7. The steel reinforcement frame for the bridge abutment slab according to claim 1, characterized in that, The transverse reinforcement bars and the longitudinal reinforcement bars of the joint intersect obliquely in the horizontal direction.
8. The steel reinforcement frame for the bridge abutment slab according to claim 1, characterized in that, Also includes: An anchor bolt is located on the inner side of the outer contour of the reinforcing steel frame, near the intersection of the transverse reinforcing bars or joint transverse reinforcing bars and the longitudinal reinforcing bars or joint longitudinal reinforcing bars. The anchor bolt is fixedly connected to the reinforcing steel frame, and the bolt body is embedded in the concrete structure.