Pi-shaped steel-concrete composite beam bridge

Abstract

The utility model discloses a Pi-shaped steel-concrete composite beam bridge, which belongs to the technical field of bridge engineering and comprises a plurality of Pi-shaped structures, the Pi-shaped structures are connected through channel steel composite steel plates, first channel steel is welded at the top ends of the Pi-shaped structures, and the first channel steel and the channel steel composite steel plates are alternately arranged and transversely provided with fixing holes in a penetrating manner. The bridge deck slab is poured on the bridge deck slab; the Pi-shaped structure comprises a top plate, two sides of the lower surface of the top plate are connected with webs respectively, the bottom ends of the webs are connected with a bottom plate, and narrow steel plate strips are horizontally arranged on the lower surfaces of the side edges of the top plate and protrude out of the top plate to be connected with channel steel combined steel plates. After the multiple pi-shaped structures are connected through the channel steel combined steel plates, the upper edge bridge deck slab is poured, the structure can be longitudinally divided into multiple blocks according to transportation conditions, the construction process is simplified, and the construction period is shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge engineering technical field, in particular to a kind of π type steel mixed combination beam bridge. BACKGROUND

[0002] The existing steel mixed combination beam is generally processed by steel plant I-beam girder, hoisted to the site after longitudinal beam is in place, and then connected with cross beam, and then the main beam is used to form bridge deck plate, which has the following problems: the single I-beam has poor torsional stiffness and is easy to lose stability, and additional torsional measures are needed, such as forming double I-beam structure by cross beam and temporary flat connection for hoisting, which solves the problem but has complex structure; the box beam scheme can avoid the problem but increases the cost; the traditional wooden bridge deck plate template is time-consuming and not suitable for crossing existing roads. The introduction of profiled steel sheet, steel bar truss floor plate and other bridge templates can be welded on the top edge of the I-beam, and can be left after the bridge is completed, which can save the installation and removal process and speed up the progress, but there are problems such as uneven lower edge of the floor, easy to rust, poor adaptability to the scene, need to be connected with different suppliers, etc.

[0003] Chinese publication number CN209923753U, publication date: 2020.01.10, proposes a steel plate combination beam and bridge with integral prefabricated steel girder and bridge deck plate. Two steel girders and prefabricated concrete bridge deck plates are formed into a π type whole before hoisting; solve the problem of poor stability of steel girder. Multiple groups of structures are connected by bridge deck plate wet joint, but the template still needs to be set near the wet joint, in addition, due to the integral prefabrication of bridge deck plate, a larger prefabrication site is needed. Steel plant is only responsible for the construction of main beam, and bridge deck plate still needs to be prefabricated by construction unit, and bridge deck plate is quite different from conventional T-beam or small box beam structure, which cannot completely use the prefabrication site of construction unit T-beam or small box beam, and needs to prepare additional site, which is large investment. UTILITY MODEL CONTENT

[0004] The utility model aims to provide a π type steel mixed combination beam bridge to solve the problems in the prior art, maintain the existing advantages of combination beam, improve the above shortcomings, simplify the construction process and shorten the construction period.

[0005] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of π type steel mixed combination beam bridge, including several π type structures, several π type structures are connected by channel steel combined steel plate, first channel steel is welded at the top of π type structure, fixed hole is horizontally provided in first channel steel and second channel steel, first channel steel and channel steel combined steel plate are alternately arranged, and deck is poured on it;π type structure includes top plate, and the lower surface of top plate is connected with web respectively on both sides, and web bottom end is connected with bottom plate, and the lower surface of top plate side edge is horizontally provided with narrow steel plate belt, and narrow steel plate belt protrudes top plate and channel steel combined steel plate receiving.The multiple π type structures are connected by channel steel combined steel plate, and then pouring upper edge deck, and the structure can be divided into multiple blocks according to transportation conditions longitudinally. Top plate between π type structures is connected by connecting assembly, and bottom plate and web are connected by welding or high-strength bolt.

[0006] Preferably, the two ends of the web are fixed with the top plate and the bottom plate respectively, and the web is vertically arranged with the top plate and the bottom plate to form the π type structure. The π type structure includes a top plate, two webs connected to the lower surface of the top plate, and a bottom plate component connected to the lower surface of each web, forming a π type structure. The bottom plate and the web are connected by welding or high-strength bolt. The web is vertically arranged with the top plate and the bottom plate to form a stable π type structure. This design can effectively improve the overall stability and carrying capacity of the beam bridge, and facilitate accurate welding or high-strength bolt connection operation for construction personnel, further improving construction efficiency and quality.

[0007] Preferably, the plurality of π type structures are arranged along the length direction of the deck, and the web is internally provided with a stiffened rib steel plate. The stiffened rib steel plate can be arranged as needed. The web is internally provided with a stiffened rib steel plate, which can be arranged flexibly as needed. This design can significantly enhance the shear capacity and local stability of the web, effectively prevent the web from buckling under high stress, and thus improve the structural performance and service life of the entire beam bridge.

[0008] Preferably, the top end of the top plate is transversely welded with a first channel steel, and the top plates between the plurality of π type structures are connected by connecting assemblies. The first channel steel can serve as a shear key of the combined beam bridge, enhancing the connection strength between the top plate and the channel steel combined steel plate, and on the other hand, in combination with the top plate, greatly increasing the lateral stiffness of the top plate, facilitating construction work on the π type structure, and improving the safety and convenience of construction.

[0009] Preferably, the connecting assembly includes a splicing plate arranged on the upper surface between adjacent top plates and fixed with the top plates by bolts and nuts. One splicing plate is arranged on the upper surface between two adjacent top plates, and two pairs of bolts and nuts are fixed with the two top plates respectively. The connecting assembly uses a splicing plate and bolts and nuts for fixation. This connection method is simple and reliable, facilitating quick installation and adjustment on site, greatly shortening the construction period, and also facilitating maintenance and replacement in the later period, reducing maintenance costs.

[0010] Preferably, the channel steel combined steel plate comprises a horizontally placed steel plate and a second channel steel transversely welded thereon, and the width of the steel plate is less than the distance between adjacent π-shaped structures.

[0011] Preferably, guardrails are arranged outside the π-shaped structures at both ends, guardrail steel plates are arranged on the side where the guardrails are arranged and are perpendicular to the top plate, and narrow steel plate strips are horizontally arranged on the lower surface of the side of the top plate on the other side. The π-shaped structures between the π-shaped structures at both ends are arranged with horizontal narrow steel plate strips on both sides, which not only improves the safety of the bridge and prevents pedestrians or vehicles from falling, but also better supports the channel steel combined steel plate through the cooperation of the guardrail steel plate and the narrow steel plate strip, thereby enhancing the integrity of the bridge.

[0012] Preferably, the lower end of the guardrail steel plate protrudes from the top plate, the narrow steel plate strip protrudes from the top plate in the width direction, and the narrow steel plate strip protrudes from the top plate by a certain width. The horizontal narrow steel plate strip functions to support the channel steel combined steel plate, and after the channel steel combined steel plate is in place, welding is performed on the gap to form a whole, which improves the convenience of construction and the integrity of the structure, thereby enhancing the stability of the bridge.

[0013] Preferably, the bridge deck slab comprises longitudinal and transverse steel mesh arranged on the upper surface of the π-shaped structure and concrete. The lower edge of the bridge deck slab can not be provided with longitudinal and transverse steel bars. The main reason for not arranging longitudinal and transverse steel bars at the lower edge of the bridge deck slab is that the top plate of the π-shaped structure has been connected into a whole by the steel plate, and is located at the bottom edge of the bridge deck slab and can serve as a tensile device for the bottom edge of the bridge deck edge. Further, the construction of the steel bars is omitted. By arranging longitudinal and transverse steel bars at the lower edge of the bridge deck slab and using the steel plate of the top plate of the π-shaped structure as a tensile device, the construction of the steel bars is omitted, the construction process is further simplified, the construction cost is reduced, the self-weight of the bridge deck slab is reduced, and the service life of the bridge is improved.

[0014] Preferably, the first channel steel on the upper surface of the π-shaped structure and the second channel steel on the upper portion of the channel steel combined steel plate are alternately and uniformly arranged. After transverse arrangement, the arrangement of the channel steel shear keys on the upper edge of the π-shaped steel-concrete composite girder bridge is increased, the longitudinal shear capacity of the bridge is enhanced, and the overall stability of the bridge is improved. The structure of the steel-concrete composite girder bridge is provided with a transverse web plate near the support point and a bottom plate and a top plate welded to form a transverse beam whole.

[0015] The π-shaped steel-concrete composite girder bridge has the advantages that the problems in the prior art are solved, the shortcomings of the prior art are improved while maintaining the existing advantages of the composite girder, the construction process is simplified, and the construction period is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The π-shaped steel-concrete composite beam bridge structure elevation view provided in the present application.

[0017] Figure 2 The π-shaped steel-concrete composite beam bridge structure plan view provided in the present application.

[0018] Figure 3 The π-shaped steel-concrete composite beam bridge combination view provided in the present application.

[0019] Figure 4 The π-shaped steel-concrete composite beam bridge roof plate connecting device plan view provided in the present application.

[0020] Figure 5 The π-shaped steel-concrete composite beam bridge roof plate connecting device detail view provided in the present application.

[0021] Figure 6 The π-shaped steel-concrete composite beam bridge structure view and the A-A direction section view provided in the present application.

[0022] The figure mark explanation: 1, π-shaped structure; 101, roof plate; 102, web plate; 103, bottom plate; 104, stiffened rib steel plate; 105, guardrail steel plate; 106, narrow steel plate belt; 107, first channel steel; 108: fixing hole; 2, channel steel composite steel plate; 201, steel plate; 202, second channel steel; 3, bridge deck slab; 301, longitudinal and transverse steel bars; 302, concrete; 4, connecting assembly; 401, splicing plate; 402, bolt. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the present application.

[0024] The steel-concrete composite beam in the prior art is generally processed by a steel factory, and the I-shaped steel girder is hoisted to the site, and then the connection of the cross beam is performed, and the formwork is erected on the girder, and then the bridge deck slab 3 can be constructed. Such mode has the following some deficiencies.

[0025] 1) On-site hoisting of single I-beam is prone to lose stability due to poor torsional stiffness of the I-beam, and the construction unit needs to increase necessary torsional measures. For example, two beams are hoisted together after being formed into a double I-beam structure through a cross beam and some additional temporary flat links. Although this method solves the disadvantage of easy torsion of the single I-beam, the cross beam and the flat link are still somewhat complicated and have room for optimization. Or the I-beam scheme is not used, and a box beam scheme is used, but the cost increases accordingly.

[0026] 2) The concrete 302 can be poured after the bridge deck 3 formwork is erected on site. The traditional way of erecting the formwork is a wooden form, which is time-consuming and not suitable for crossing the existing road. Some designers introduce profiled steel sheets, steel bar truss floor slabs and other products into bridges as bridge formworks, which can be directly welded to the upper edge of the I-beam as a construction platform and remain as part of the bridge after the bridge is completed. Compared with the traditional wooden form method, the process of installing and removing the formwork is omitted, the construction progress is accelerated, the construction period is shortened, the construction convenience is greatly improved, and it is suitable for various viaducts and composite beams crossing intersections. However, the lower edge of the floor slab is uneven, which affects the landscape effect of the bridge; the bottom edge of the product is usually made of thin galvanized steel sheet, which has corrosion problems; the on-site adaptability is poor: the product usually has standard sizes and specifications, and cannot adapt to or needs to be customized for the common widening, skew and super-high conditions of the bridge, thereby increasing the cost and time. The product supplier and the steel bridge supplier are often not the same, and the general contractor needs to spend additional time on connection.

[0027] The π-shaped steel concrete composite beam structure provided by the utility model maintains the existing advantages of the composite beam, improves the above-mentioned deficiencies, simplifies the construction process and shortens the construction period.

[0028] As shown in Figure 1 and Figure 6 , the π-shaped steel concrete composite beam bridge mainly comprises a plurality of π-shaped structures 1, and the π-shaped structures 1 are core stress units of the entire bridge. The plurality of π-shaped structures 1 are connected through channel steel composite steel plates 2 to form a continuous and stable bridge framework. First channel steels 107 are welded at the top ends of the π-shaped structures 1, the first channel steels 107 and second channel steels 202 are transversely provided with fixing holes 108, the first channel steels 107 and the channel steel composite steel plates 2 are alternately arranged, and bridge decks 3 are poured on the unique structure.

[0029] As shown in Figure 1 and Figure 3As shown, the π-shaped structure 1 includes a top plate 101, with web plates 102 perpendicularly connected to both sides of the lower surface of the top plate 101. The bottom ends of the web plates 102 are connected to a bottom plate 103. This structural design ensures that the web plates 102 are perpendicularly positioned to the top plate 101 and the bottom plate 103, together forming a stable π-shaped structure 1. Specifically, the π-shaped structure 1 consists of a top plate 101, two web plates 102 connected to the top plate 101, and a bottom plate 103 connected to each of the two web plates 102. In actual construction, this clear and defined structural form facilitates precise operations by construction personnel. Whether welding or using high-strength bolts for connection, the quality and precision of the connection can be guaranteed, thereby effectively improving the overall stability and load-bearing capacity of the beam bridge.

[0030] like Figure 2 As shown, stiffening ribs 104 are provided inside the web 102, and the stiffening ribs 104 can be flexibly arranged according to actual needs. When the bridge is subjected to large loads or faces complex stress conditions, the rationally arranged stiffening ribs 104 can significantly enhance the shear resistance and local stability of the web 102. This can effectively prevent buckling deformation of the web 102 under high stress, thereby improving the structural performance and service life of the entire beam bridge. For example, in some bridges with heavy traffic, by increasing the number of stiffening ribs 104 and adjusting their arrangement, the impact and vibration of vehicle loads can be better addressed.

[0031] like Figure 3 , Figure 4 and Figure 5 As shown, a first channel steel 107 is horizontally welded to the top of the top plate 101, and the top plates 101 of several π-shaped structures 1 are connected by connecting components 4. The connecting components 4 include splicing plates 401, which are disposed on the upper surface between adjacent top plates 101 and fixed to the top plates 101 respectively by bolts 402 and nuts. In actual construction, a splicing plate 401 is placed on the upper surface between two adjacent top plates 101, and then two pairs of bolts 402 and nuts are used to firmly fix it to the two top plates 101 respectively. This connection method is simple and reliable, and has many advantages. On the one hand, it facilitates rapid on-site installation and adjustment; construction personnel only need to follow the established operating procedures to quickly complete the connection work of the top plates 101, greatly shortening the construction cycle. On the other hand, in the later maintenance and upkeep of the bridge, if it is necessary to inspect or replace parts at the connection points of the top plates 101, this connection method can also be easily implemented, reducing maintenance costs.

[0032] The base plate 103 and web plate 102 are connected by welding or high-strength bolts. During construction, the construction personnel will choose the appropriate connection method according to the specific project requirements and site conditions. Welding allows the base plate 103 and web plate 102 to form a whole, resulting in more direct force transmission and high connection strength; while high-strength bolt connections are convenient to install and disassemble, demonstrating their unique advantages in situations with high construction schedule requirements or where later structural adjustments are needed. Regardless of the connection method, strict adherence to relevant construction specifications and quality standards is required to ensure the reliability of the connection.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, the channel steel composite plate 2 includes a horizontally placed steel plate 201 and a second channel steel 202 welded transversely to it. The width of the steel plate 201 is smaller than the distance between adjacent π-shaped structures 1. During on-site construction, the slightly smaller width of the steel plate 201 facilitates positioning and adjustment by construction personnel, improving the flexibility and precision of construction. Construction personnel can fine-tune the position of the channel steel composite plate 2 according to the actual construction situation, reducing construction problems caused by dimensional errors and further simplifying the construction process. At the same time, the transverse alternation and uniform arrangement of the first channel steel 107 and the second channel steel 202 on the upper part of the channel steel composite plate 2 is equivalent to densifying the channel steel shear keys at the upper edge of the web 102 of the π-shaped steel-concrete composite beam bridge, greatly enhancing the longitudinal shear resistance of the bridge and improving the overall stability of the bridge.

[0034] like Figure 1 As shown, guardrails are installed on the outer sides of the π-shaped structure 1 at both ends. In daily traffic, vehicles may deviate from their normal trajectory due to various unforeseen circumstances, and pedestrians may inadvertently approach the edge of the bridge. The guardrails act as a sturdy protective barrier, effectively preventing pedestrians or vehicles from accidentally falling and ensuring the safety of pedestrians and vehicles crossing the bridge. Guardrail steel plates 105 are installed perpendicular to the top plate 101 on the side where the guardrails are installed, and a narrow steel strip 106 is horizontally installed on the lower surface of the other side of the top plate 101. The guardrails are installed to improve the safety of the bridge, effectively prevent pedestrians or vehicles from falling, and ensure the safety of pedestrians and vehicles.

[0035] The combination of guardrail steel plate 105 and narrow steel strip 106 plays a deeper role. They better support the channel steel composite plate 2, making the various parts of the bridge more tightly connected and enhancing the overall integrity of the bridge. From a structural mechanics perspective, the design of the combination of guardrail steel plate 105 and narrow steel strip 106 has a deeper engineering significance. This combination not only provides basic protection, but more importantly, it forms a complete force transmission system. Guardrail steel plate 105, as a vertical load-bearing component, can effectively transmit horizontal loads; while narrow steel strip 106, as a horizontal load-bearing component, mainly bears vertical loads. This orthogonally arranged steel structure system can better support the upper channel steel composite plate 2, and through a reasonable node connection design, a reliable force transmission path is formed between the various structural components of the bridge. This design ensures that when the bridge is subjected to vehicle loads, wind loads, and seismic forces, it can effectively transfer the load to the substructure, thereby enhancing the overall integrity and structural safety of the bridge.

[0036] like Figure 3 As shown, the π-shaped structure 1 between the two ends, without guardrails, has horizontal narrow steel plate strips 106 on both sides. The main function of the horizontal narrow steel plate strips 106 is to support the channel steel composite steel plates 2. Their cross-sectional dimensions and spacing have been precisely calculated to ensure they meet load-bearing requirements. After the channel steel composite steel plates 2 are in place, construction workers weld them in the gaps to secure them, thus forming a tight whole for the bridge except for the bridge deck 3. This design not only improves construction convenience but also enhances bridge stability and ensures the reliability of connection nodes. It allows the bridge to work collaboratively under various loads, improving its load-bearing capacity. Through this systematic design, the substructure of the bridge, except for the bridge deck 3, forms a complete load-bearing system.

[0037] like Figure 1 As shown, the bridge deck 3 includes a mesh of longitudinal and transverse reinforcing bars 301 placed on the upper surface of the π-shaped structure 1 and concrete 302. It is worth noting that the lower edge of the bridge deck 3 may not require longitudinal and transverse reinforcing bars 301. This is because the top plate 101 of the π-shaped structure 1 is connected as a whole by steel plates 201 and is located at the bottom edge of the bridge deck 3, serving as a tensile support for the bottom edge of the bridge deck. This design further omits the construction of reinforcing bars, offering multiple advantages. On the one hand, it simplifies the construction process, reduces construction procedures such as reinforcing bar tying, and saves construction time and labor costs; on the other hand, it reduces the self-weight of the bridge deck 3, lowers the overall load on the bridge, and increases the bridge's service life. In actual construction, the construction workers will first lay the mesh of longitudinal and transverse reinforcing bars 301 on the π-shaped structure 1, and then pour the concrete 302 to ensure the strength and quality of the bridge deck 3.

[0038] In the steel-concrete composite beam bridge structure, near the supports, a transverse web 102 and a bottom plate 103 are welded to the top plate 101 to form an integral crossbeam. This design enhances the bridge's load-bearing capacity and stability at the supports, effectively distributing concentrated loads at these points. When the bridge is subjected to external forces such as vehicle loads, the crossbeam can evenly transfer the load to each π-shaped structure 1, preventing structural damage caused by stress concentration at the supports and ensuring the safe operation of the bridge.

[0039] In summary, this utility model's π-shaped steel-concrete composite beam bridge successfully solves the problems in existing technologies through innovative structural design and reasonable construction methods. While maintaining the existing advantages of composite beams, it improves upon their shortcomings, simplifies the construction process, shortens the construction period, and enhances the overall performance and economic benefits of the bridge.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A kind of π type steel mixed combination beam bridge, it is characterized in being, Including several π type structures, several π type structures are connected by channel steel composite steel plate, first channel steel is welded at the top of π type structure, first channel steel and channel steel composite steel plate are alternately arranged and are all transversely provided with fixed hole, deck is poured on it; π type structure includes top plate, the lower surface of top plate is connected with web respectively on both sides, web bottom end is connected with bottom plate, the lower surface of top plate side edge is horizontally provided with narrow steel plate strip, narrow steel plate strip protrudes top plate and channel steel composite steel plate receiving.

2. The π-type steel-concrete composite girder bridge according to claim 1, characterized in that, Web is fixed with top plate and bottom plate respectively at both ends, web is vertically arranged with top plate, the bottom plate and forms π type structure.

3. The π-type steel-concrete composite girder bridge according to claim 1 or 2, characterized in that, Several π type structures are arranged along the length direction of deck, and stiffened rib steel plate is arranged in web.

4. The π-type steel-concrete composite girder bridge according to claim 1 or 2, characterized in that, The top end of top plate is transversely welded with first channel steel, and the top plates between several π type structures are connected by connecting assembly.

5. The π-type steel-concrete composite girder bridge according to claim 4, characterized in that, Connecting assembly includes splicing plate, and the upper surface of splicing plate is arranged between adjacent top plates, and is fixed with top plate by bolt and nut respectively.

6. The π-type steel-concrete composite girder bridge according to claim 1, characterized in that, Channel steel composite steel plate includes horizontally placed steel plate and second channel steel transversely welded on it, and the second channel steel is transversely provided with fixed hole, and the width of steel plate is less than the distance between adjacent π type structures.

7. The π-type steel-concrete composite girder bridge according to claim 1 or 6, characterized in that, The outer side of π type structure at both ends is provided with guardrail, and the side provided with guardrail is provided with guardrail steel plate perpendicular to top plate, and the lower surface of the side surface of the other side top plate is horizontally provided with narrow steel plate strip.

8. The π-type steel-concrete composite girder bridge according to claim 7, characterized in that Narrow steel plate strip is arranged on both sides of π type structure between π type structures at both ends, the lower end of guardrail steel plate protrudes top plate, and the width direction of narrow steel plate strip protrudes top plate.

9. The π-type steel-concrete composite girder bridge according to claim 3, characterized in that, Deck includes longitudinal and transverse steel mesh on the upper surface of π type structure and concrete.

10. The π-type steel-concrete composite girder bridge according to claim 6, characterized in that, The first channel steel on the upper surface of π type structure and the second channel steel on the upper portion of channel steel composite steel plate are alternately and uniformly arranged.

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