River-crossing road-crossing low-structure height combined filling beam
By combining low-height bridge structures across rivers and roads with fill beams, and using bottom steel plates and T-shaped stiffening beams with cast-in-place concrete to form a simply supported structure, the problem of large structural height in existing bridges has been solved, achieving a low-cost and highly durable bridge design.
Patent Information
- Application Number
- CN202520042249.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-01-09
AI Technical Summary
In existing bridge projects, the structural height of precast beam bridges, cast-in-place bridges, and steel structure bridges with a span of 30m is relatively large, which leads to the raising of the road connection lines on both sides of the bridge, the length of the longitudinal slope connection lines, and the high overall cost. In addition, the construction of cast-in-place bridges affects the navigation channel or road under the bridge, and the wet joints of precast beam bridges have poor durability.
The low-structural-height composite fill beam is adopted for crossing rivers and roads. It is formed by combining the bottom steel plate and the T-shaped stiffening beam above it with cast-in-place concrete to form a simply supported structure, which reduces the beam height, reduces the amount of steel reinforcement, avoids wet joints, and improves the integrity and durability.
This approach achieves a smaller beam height and structural height, reducing the overall length and cost of the bridge, improving structural load-bearing capacity and durability, and reducing construction difficulty and material usage.
Smart Images
Figure CN223660615U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of bridge engineering, specifically relating to a low-structure-height composite fill beam for crossing rivers and roads. Background Technology
[0002] In highway and municipal bridge engineering, the design of bridges spanning narrow roads or navigable rivers must comply with a series of specifications to ensure safety, reliability, and economic efficiency. Taking a restricted Class VII waterway as an example, its two-way navigation clearance is 25m. Considering the longitudinal width of the substructure, the bridge span needs to be 30m. Currently, 30m spans typically employ precast beam bridges, cast-in-place bridges, or steel structure bridges, which have the following disadvantages:
[0003] (1) Precast beam bridges refer to bridges where beams are prefabricated in a factory or prefabrication yard, transported to the construction site for hoisting, and finally connected into a whole by on-site wet joint pouring. Precast beam bridges include hollow slab bridges, precast small box girders, and precast T-beams. Hollow slab bridges can accommodate a maximum span of 25m and a beam height of 1.25m, but are not suitable for spans of 30m. Precast small box girders and precast T-beams can accommodate spans of 30m, but the beam height is relatively large, with small box girders having a beam height of 1.6m and T-beams having a beam height of 2.0m. In addition, precast concrete small box girders and T-beams are heavy and difficult to hoist. After hoisting, wet joint pouring is required for connection, resulting in poor overall transverse performance. Moreover, wet joint beams have poor durability, and the bottom slab is prone to cracking over time, leading to defects such as concrete carbonization, which reduces the load-bearing capacity of the beam bridge.
[0004] (2) The beam height of a 30m span cast-in-place bridge is 1.6m, which is relatively large; moreover, cast-in-place bridges require the erection of supports and formwork under the bridge, which will affect the navigation channel or road under the bridge during construction.
[0005] (3) Steel structure bridges refer to bridges whose main load-bearing structures are made of steel. A 30m span steel structure bridge uses orthotropic steel plate beams, and the beam height needs to be 1.3m, which is relatively large.
[0006] In summary, precast bridges, cast-in-place bridges, and steel bridges all have relatively large structural heights, significant elevation changes in road connections on both sides, long longitudinal slopes, and high overall costs. Utility Model Content
[0007] To overcome the aforementioned shortcomings of existing technologies, this utility model provides a low-structural-height composite fill beam for crossing rivers and roads, applicable to both road and river bridges. This low-structural-height composite fill beam adopts a simply supported structure, combining a bottom steel plate and a T-shaped stiffening beam above it with cast-in-place concrete. This results in good structural integrity, low construction difficulty, and a structural height that is only 1 / 28 to 1 / 36 of the span. The beam height is significantly smaller than conventional structures, allowing for lower elevations on both sides, reducing the overall bridge length, and saving costs. Furthermore, the bottom steel plate and T-shaped stiffening beam participate in the load-bearing structure of the fill beam, eliminating the need for longitudinal and transverse reinforcing bars at the lower edge of the concrete, reducing the amount of steel used, and making the lower edge of the concrete less prone to cracking in the later stages of operation. This improves the structural bearing capacity and durability of the composite fill beam.
[0008] The technical solution of this utility model is as follows:
[0009] The low-structural-height composite filler beam spanning rivers and roads includes a steel formwork and concrete to which the steel formwork is cast as a single unit. The steel formwork includes two side plates distributed left and right, and multiple foundation units located between the two side plates. Above each foundation unit, a set of transverse reinforcing bars is spaced along its longitudinal length. Above the transverse reinforcing bars, a set of longitudinal reinforcing bars is spaced along its transverse length. Each foundation unit includes a bottom steel plate and a set of T-shaped stiffening beams spaced on the bottom steel plate. Adjacent bottom steel plates are connected by bolts. Adjacent T-shaped stiffening beams are connected by a set of angle steel. Each T-shaped stiffening beam includes a web and a top plate above the web. On both sides of the web, a set of vertical stiffening plates is spaced along its longitudinal length.
[0010] Compared with existing technologies, the low-structural-height composite fill beam of this application adopts a simply supported structure. By combining the bottom steel plate and the T-shaped stiffening beam above it with cast-in-place concrete, the structure has no wet joints, good integrity, and low construction difficulty. Moreover, the structural height only needs to be 1 / 28 to 1 / 36 of the span, and the beam height is much smaller than that of conventional structures. This allows for a smaller beam height to meet the crossing requirements, resulting in a more harmonious structural appearance. At the same time, the smaller beam height can lower the elevation on both sides, reduce the total length of the bridge, and save costs. In addition, the bottom steel plate and the T-shaped stiffening beam participate in the structural stress of the fill beam (the T-shaped stiffening beam ensures that the steel structure formwork meets the stress requirements during construction before the concrete solidifies, and participates in the structural stress of the fill beam after the concrete solidifies), so that there is no need to set longitudinal and transverse reinforcing bars at the lower edge of the concrete, reducing the amount of steel material used. Moreover, the lower edge of the concrete is not prone to cracking in the later stage of operation, thereby improving the structural bearing capacity and durability of the composite fill beam.
[0011] As an optimization, in the aforementioned low-structure composite fill beams spanning rivers and roads, the angle steel between two adjacent T-shaped stiffening beams on the same bottom steel plate is welded and fixed at both ends to two vertical stiffening plates; the angle steel between two adjacent foundation units is bolted to two vertical stiffening plates at both ends. Individual foundation units are first fabricated in the factory and then transported to the construction site. The angle steel and vertical stiffening plates are connected by welding, which is convenient and ensures good overall integrity of the finished foundation unit. Adjacent foundation units are then connected on-site, with the angle steel and vertical stiffening plates bolted together, facilitating assembly and ensuring high connection strength.
[0012] As an optimization, in the aforementioned low-structure composite fill beam spanning rivers and roads, a connecting plate is provided between two adjacent bottom steel plates, and the two ends of the connecting plate are respectively connected and fixed to the two bottom steel plates by bolts. In this case, the connection structure is simple and the construction difficulty is low.
[0013] As an optimization, in the aforementioned low-structure composite filler beam spanning rivers and roads, a set of shear studs is spaced apart on the bottom steel plate. This improves the connection strength and stability between the steel structure formwork and the concrete, thereby enhancing the overall load-bearing performance of the composite filler beam.
[0014] As an optimization, in the aforementioned low-structure composite fill beam spanning rivers and roads, the transverse and longitudinal reinforcing bars are fixed together by tying. This ensures the position of the reinforcing bars within the concrete and improves the stability of the reinforced concrete structure.
[0015] As an optimization, in the aforementioned low-structure composite fill beams spanning rivers and roads, the bottom steel plate is provided with 2 or 3 T-shaped stiffening beams; the spacing between two adjacent T-shaped stiffening beams is 80-120cm. If the structure of a single foundation unit is too large, it is not conducive to transportation; if the structure of a single foundation unit is too small, it will prolong the on-site assembly time and increase the workload; 2-3 T-shaped stiffening beams on a single bottom steel plate are optimal.
[0016] As an optimization, in the aforementioned low-structure composite fill beam spanning rivers and roads, the side plates are welded and fixed to the bottom steel plates located at the ends. This facilitates processing and ensures high connection strength. Furthermore, connecting plates are welded to the inner walls of the side plates; angle steel is welded between the connecting plates and the vertical stiffening plates. This improves the connection strength between the side plates and the foundation units.
[0017] As an optimization, in the aforementioned low-structure composite fill beam spanning rivers and roads, the thickness of the bottom steel plate can be 14–20 mm; the diameter of the transverse reinforcing bars can be 12–18 mm; and the diameter of the longitudinal reinforcing bars can be 16–20 mm. This ensures the load-bearing performance of the bottom steel plate, transverse reinforcing bars, and longitudinal reinforcing bars. Attached Figure Description
[0018] Figure 1 This is a structural schematic diagram of the low-structure composite fill beam spanning rivers and roads in this application;
[0019] Figure 2 This is a partial schematic diagram of the low-structure composite fill beam spanning rivers and roads in this application.
[0020] The markings in the attached diagram are as follows: 1-bottom steel plate; 2-T-shaped stiffening beam; 21-top plate; 22-web plate; 23-vertical stiffening plate; 3-side plate; 4-concrete; 5-connecting plate; 6-angle steel; 7-transverse reinforcement; 8-longitudinal reinforcement; 9-bolt; 10-shear stud; 11-connecting plate. Detailed Implementation
[0021] The present application will be further described below with reference to the accompanying drawings and embodiments.
[0022] In existing technologies, for bridges spanning small rivers, since the rivers have navigation requirements and the bridges intersect with roads on both sides, the bridge structure height needs to be minimized and the road elevation on both sides needs to be lowered as much as possible while meeting navigation requirements. For bridges spanning roads, the bridge structure height needs to be minimized and the total length of the bridge needs to be reduced as much as possible while meeting the clearance requirements of the roads under the bridge.
[0023] To accommodate the above two situations, this utility model provides a low-structural-height composite fill beam for crossing rivers and roads (it can also be applied to other situations). It adopts a simply supported structure, with a 14-20mm thick bottom steel plate 1 and steel side plates 3 on both sides. Multiple T-shaped stiffening beams 2 are arranged along the transverse length on the bottom steel plate 1, with a transverse spacing of 80-120cm. Adjacent T-shaped stiffening beams 2 are connected by angle steel 6. A 16mm diameter transverse steel bar 7 is placed above the T-shaped stiffening beams 2, and a 20mm diameter longitudinal steel bar 8 is placed above the transverse steel bar 7. This structure, combining the bottom steel plate 1, T-shaped stiffening beams 2, side plates 3, steel bars, and cast-in-place concrete 4, has a maximum span of 40m. The structural height only needs to be 1 / 28 to 1 / 36 of the span, meaning the beam height of a 30m span composite fill beam is approximately 0.9m, which is much smaller than that of conventional structures.
[0024] In this application, "horizontal" and "vertical" refer to the states shown in the attached drawings; Figure 1 For example, "horizontal" refers to the left-right direction, and "vertical" refers to the front-back direction.
[0025] Example:
[0026] See Figure 1 and Figure 2In this embodiment, the low-structure composite fill beam spanning the river and road includes a steel structure formwork and concrete 4 for casting the steel structure formwork as a single unit. The steel structure formwork includes two side plates 3 distributed on the left and right, and multiple foundation units located between the two side plates 3. Above the foundation unit (i.e., above the top plate 21), a set of transverse reinforcing bars 7 is provided at intervals along the longitudinal length of the foundation unit. Above the transverse reinforcing bars 7, a set of longitudinal reinforcing bars 8 is provided at intervals along the transverse length of the foundation unit. The foundation unit includes a bottom steel plate 1 and a spacer plate 21. Two T-shaped stiffening beams 2 are spaced apart on the bottom steel plate 1; adjacent bottom steel plates 1 are connected by bolts 9; adjacent T-shaped stiffening beams 2 are connected by a set of angle steel 6; the T-shaped stiffening beam 2 includes a web plate 22 and a top plate 21 located above the web plate 22; on both sides of the web plate 22, along its longitudinal length, a set of vertical stiffening plates 23 are spaced apart (in this embodiment, vertical stiffening plates 23 are set every 4m along the longitudinal length of the web plate 22); the top plate 21, the web plate 22 and the vertical stiffening plates 23 are fixed together by welding.
[0027] In this embodiment, the angle steel 6 between two adjacent T-shaped stiffening beams 2 on the same bottom steel plate 1 is welded and fixed at both ends to two vertical stiffening plates 23 respectively; the angle steel 6 between two adjacent foundation units is bolted and fixed at both ends to two vertical stiffening plates 23 respectively. A single foundation unit is first processed in the factory and then transported to the construction site. The angle steel 6 and the vertical stiffening plates 23 are connected by welding, which is convenient for processing and results in good overall integrity of the processed foundation unit. Adjacent foundation units are then connected after being transported to the site. The angle steel 6 and the vertical stiffening plates 23 are bolted together, which is convenient for assembly and provides a high degree of connection strength.
[0028] In this embodiment, a connecting plate 5 is provided between two adjacent bottom steel plates 1, and the two ends of the connecting plate 5 are respectively connected and fixed to the two bottom steel plates 1 by bolts 9. At this time, the connection structure is simple and the construction difficulty is low.
[0029] In this embodiment, a set of shear studs 10 are spaced apart on the bottom steel plate 1. The main function of the shear studs 10 is to enhance the stiffness and stability of the component by transmitting shear force. After setting the shear studs 10 on the bottom steel plate 1, the connection strength and connection stability between the steel structure formwork and the concrete 4 can be improved, thereby improving the overall stress performance of the composite filler beam. Three shear studs are provided between two adjacent vertical stiffening plates 23.
[0030] In this embodiment, the transverse reinforcing bars 7 and the longitudinal reinforcing bars 8 are fixed together by tying. This ensures the position of the reinforcing bars in the concrete and improves the stability of the reinforcing bar structure. The tying operation can be carried out using reinforcing bar tying machinery, which can quickly complete the reinforcing bar tying work and save a lot of time and labor.
[0031] In this embodiment, the side plate 3 is welded and fixed to the bottom steel plate 1 located at the end. This facilitates processing and ensures high connection strength. Furthermore, a connecting plate 11 is welded to the inner wall of the side plate 3; an angle steel 6 is welded between the connecting plate 11 and the vertical stiffening plate 23. This improves the connection strength between the side plate 3 and the foundation unit.
[0032] In this embodiment, the spacing between two adjacent T-shaped stiffening beams 2 is 80-120cm; the thickness of the bottom steel plate 1 is 17mm; the diameter of the transverse reinforcing bar 7 is 16mm; and the diameter of the longitudinal reinforcing bar 8 is 20mm.
[0033] During construction, the bottom steel plate 1, left and right side plates 3, and T-shaped stiffening beams 2 are first fabricated in the factory. In this embodiment, the two T-shaped stiffening beams 2 and the bottom steel plate 1 below them are used as a basic unit. In actual fabrication, the basic unit is divided into multiple longitudinal segments with a longitudinal length of about 15m, and then transported to the bridge site. At the construction site, the longitudinal segments are spliced together into hoisting segments along the longitudinal length direction using high-strength bolts, thus assembling the basic unit. Then, a crane is used to hoist it into place, and the bottom steel plates 1 are connected with high-strength bolts along the transverse length direction, thus connecting multiple basic units into a whole. Then, 16mm diameter transverse steel bars are laid on top of the T-shaped stiffening beams, and 20mm longitudinal steel bars are tied on top of the transverse steel bars. After the steel bars are laid, concrete 4 is poured in place using the bottom steel plate 1, left and right side plates 3, and T-shaped stiffening beams 2 as steel structure formwork to form a low-stiffness composite filler beam. At this time, the hoisting difficulty of the basic unit is small, and no temporary formwork or full-span scaffolding is required during concrete pouring, resulting in lower construction difficulty and cost.
[0034] The above description is merely a specific embodiment of this utility model. It should be noted that any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model should be included within the protection scope of this utility model. Other contents not described in detail belong to the prior art known to those skilled in the art.
Claims
1. A low-structural-height composite fill beam spanning rivers and roads, characterized by: The system includes a steel structure formwork and concrete (4) for casting the steel structure formwork as a whole; the steel structure formwork includes two side plates (3) distributed on the left and right, and multiple foundation units between the two side plates (3); above the foundation unit, a set of transverse steel bars (7) are spaced apart along the longitudinal length of the foundation unit; above the transverse steel bars (7), a set of longitudinal steel bars (8) are spaced apart along the transverse length of the foundation unit; the foundation unit includes a bottom steel plate (1) and a set of T-shaped stiffening beams (2) spaced apart on the bottom steel plate (1); adjacent bottom steel plates (1) are connected by bolts (9); adjacent T-shaped stiffening beams (2) are connected by a set of angle steel (6); the T-shaped stiffening beam (2) includes a web (22) and a top plate (21) above the web (22); on both sides of the web (22), a set of vertical stiffening plates (23) are spaced apart along its longitudinal length.
2. The low-structure-height composite fill beam across rivers and roads according to claim 1, characterized in that: Angle steel (6) between two adjacent T-shaped stiffening beams (2) on the same bottom steel plate (1) is welded and fixed at both ends to two vertical stiffening plates (23); Angle steel (6) between two adjacent foundation units is bolted and fixed at both ends to two vertical stiffening plates (23).
3. The low-structure-height composite fill beam across rivers and roads according to claim 1, characterized in that: A connecting plate (5) is provided between two adjacent bottom steel plates (1), and the two ends of the connecting plate (5) are respectively connected and fixed to the two bottom steel plates (1) by bolts (9).
4. The low-structure-height composite fill beam across rivers and roads according to claim 1, characterized in that: A set of shear studs (10) are spaced apart on the bottom steel plate (1).
5. The low-structure-height composite fill beam across rivers and roads according to claim 1, characterized in that: The transverse reinforcing bars (7) and longitudinal reinforcing bars (8) are fixed together by binding.
6. The low-structure-height composite fill beam across rivers and roads according to claim 1, characterized in that: Two or three T-shaped stiffening beams (2) are provided on the bottom steel plate (1).
7. The low-structure-height composite fill beam across rivers and roads according to claim 6, characterized in that: The spacing between two adjacent T-shaped stiffening beams (2) is 80-120cm.
8. The low-structure-height composite fill beam across rivers and roads according to claim 1, characterized in that: The side plate (3) is welded and fixed to the bottom steel plate (1) located at the end.
9. The low-structure-height composite fill beam across rivers and roads according to claim 8, characterized in that: A connecting plate (11) is welded to the inner wall of the side plate (3); an angle steel (6) is welded between the connecting plate (11) and the vertical stiffening plate (23).
10. The low-structural-height composite fill beam for crossing rivers and roads according to any one of claims 1 to 9, characterized in that: The thickness of the bottom steel plate (1) is 14-20 mm; the diameter of the transverse steel bar (7) is 16 mm; and the diameter of the longitudinal steel bar (8) is 20 mm.