CN219671054U - An integrally hoisted, prefabricated steel-concrete composite small box beam - Google Patents

Abstract

The utility model discloses an integrally-hoisted prefabricated reinforced concrete combined small box girder, which comprises reinforced concrete combined girders which are distributed in parallel along a transverse bridge deck, wherein each reinforced concrete combined girder comprises a prefabricated girder and a prefabricated concrete bridge deck, the prefabricated girder comprises a girder bottom plate, girder webs symmetrically fixed above two sides of the girder bottom plate and two girder top plates, the upper surfaces of the girder top plates are connected with the prefabricated concrete bridge deck by bolts, and the lower surfaces of the girder top plates are fixedly connected with the upper parts of the girder webs on the same side; the precast concrete deck boards are provided with reserved notches at two ends along the longitudinal bridge deck for forming the continuous structure of the longitudinal bridge deck, and a splice seam for forming a transverse wet seam structure is arranged between two adjacent precast concrete deck boards along the transverse bridge deck direction. The utility model realizes unification with the precast concrete small box girder, ensures standardized, mechanized, factory-like and rapid construction of the upper structure of the bridge, saves investment and maximizes benefit.

Description

An integrally hoisted, prefabricated steel-concrete composite small box beam

Technical field

The utility model relates to the technical field of bridges, and in particular to an integrally hoisted and prefabricated steel-concrete composite small box beam.

Background technique

At present, the commonly used spans of precast concrete small box girder bridges are 20 to 35m. As a prefabricated structure, it is easy to achieve standardization, mechanization, factoryization and rapid construction. The precast concrete small box girder is a closed structure and has a good landscape effect. Compared with simply supporting first and then continuously precast concrete small box girders on the bridge deck, the construction process is simpler, and the step of tensioning and prestressing in the negative bending moment zone is eliminated. In bridge construction, Very widely used.

However, the commonly used spans of precast concrete small box girder bridges are 20 to 35m, which is difficult to meet the needs of spans above 40m. Especially for urban bridges, due to the limitation of the space under the bridge, larger bridge spans are often required to span key lines. For such large-span bridge span structures, solutions such as prefabricated T-beams, cast-in-place concrete box girders, steel structures, and steel-concrete composite structures are often used. These plans often have flaws. Generally speaking, the first is that the construction methods and processes of the above plans are inconsistent with the precast concrete small box beams, and they cannot achieve better standardization, mechanization, factoryization and rapid construction, and they are not consistent with the precast small box beams. The overall landscape of the beam structure is quite different, and the landscape coordination is poor. Regarding each of them, the overall beam height of the prefabricated T-beam is high and the landscape is poor; the construction speed of the cast-in-place concrete box girder is slow and has a great impact on the environment; the overall cost of the steel box girder structure is high and the economy is poor; the steel-concrete combination There are various structural forms and various construction methods and techniques, which cannot be well unified with the construction techniques of prefabricated small box beams.

Utility model content

In order to overcome the above shortcomings, the purpose of this utility model is to provide an integrally hoisted prefabricated steel-concrete composite small box beam. This solution is easy to realize the design and construction technology of the prefabricated concrete small box beam structure and the prefabricated steel-concrete composite small box beam structure. The significance of the unification is not only to solve the problem that precast concrete small box girder structure bridges cannot meet the needs of local larger span locations, but also to realize the standardization, mechanization, factoryization and rapid construction of all bridge superstructures, saving investment. Finally, optimization measures are put forward in the design and construction technology of the bridge to improve the overall and local stress of the bridge, maximize benefits, and well solve the problem that the existing structure is difficult to adapt to the needs of spans above 40m and the degree of standardized production is low.

In order to achieve the above purpose, the present utility model adopts the following technical solutions:

An integrally hoisted prefabricated steel-concrete composite small box girder, including several steel-concrete composite beams distributed in parallel along the transverse bridge deck. Each of the steel-concrete composite beams includes prefabricated steel beams and precast concrete bridge decks assembled and connected up and down. The prefabricated steel beam includes a steel beam bottom plate, steel beam webs symmetrically fixed above both sides of the steel beam bottom plate, and two steel beam top plates respectively supporting the bottom surfaces of both sides of the precast concrete bridge deck. The upper surface of the steel beam top plate is bolted. The nails are connected to the precast concrete bridge deck, and the lower surface of the steel beam top plate is fixedly connected to the upper part of the steel beam web on the same side; the precast concrete bridge deck is provided at both ends along the longitudinal bridge deck for forming the longitudinal bridge deck. A reserved notch for a continuous structure, and a splicing joint for forming a transverse wet joint structure is provided between two adjacent precast concrete bridge decks along the transverse bridge deck direction.

Furthermore, the two steel beam webs on the same prefabricated steel beam are vertically connected with several transverse ribs, and the upper and lower ends of the transverse ribs are fixedly connected to the steel beam top plate and steel beam bottom plate on the same side respectively. By setting transverse ribs, the interior of the box girder can be stiffened and the torsional distortion resistance of the box girder can be improved.

Further, several transverse partitions are connected along the length direction inside the prefabricated steel beam, and the edges of the transverse partitions are respectively fixedly connected to the steel beam top plate, steel beam web plate, and steel beam bottom plate. By setting up transverse partitions, the interior of the box girder can be stiffened and the torsional distortion resistance of the box girder can be improved.

Furthermore, a through hole is provided in the middle of the diaphragm.

Furthermore, the steel beam webs on two adjacent steel-concrete composite beams along the transverse bridge deck direction are connected using a transverse structure. By setting up a cross-link structure, the integrity of the bridge can be improved.

Further, the cross-connected structure is an I-shaped steel cross-section structure, and the cross-connected structure includes a cross-connected bottom plate, a cross-connected top plate, and a cross-connected web connected between the cross-connected bottom plate and the cross-connected top plate. The cross-connected web is provided There are cross-connection reinforcing ribs connecting the cross-connection bottom plate and the cross-connection top plate at both ends. The steel beam webs on the prefabricated steel beams are provided with connecting plates extending toward the cross-connection structure. Bolts are used between the transverse connection webs and the connecting plates. connect.

Further, a closed section roof connected to the steel beam top plate is provided at both ends of the prefabricated steel beam. The closed section roof, two steel beam top plates, two steel beam webs and the steel beam bottom plate together form a closed section structure. In this way, the use of closed-section cross-section structures within a certain range at both ends of the prefabricated steel beams can improve the torsional performance of the structure and improve the stability of the steel-concrete composite small box beams during hoisting and use.

Further, the thickness of the precast concrete bridge deck is set at a gradient height. The precast concrete bridge deck has the largest bridge deck thickness at the location connected to the steel beam top plate, and the middle portion of the precast concrete bridge deck has the smallest bridge deck thickness. thickness. The use of concrete bridge decks with gradient heights can reduce the structural weight and improve the span capacity of the structure.

Furthermore, the longitudinal bridge deck continuous structure and the transverse wet joint structure are cast and formed using ultra-high performance concrete. In this way, the strong holding force of ultra-high performance concrete can be utilized to provide overall connection strength.

Furthermore, the reserved notches and the splicing joints are both provided with extended reserved steel bars, and the steel bars located in the longitudinal bridge deck continuous structure and the steel bars located in the transverse wet joint structure are connected in an overlapping manner, so that , greatly reducing the amount of welding work required for such steel bars in conventional structures, further achieving rapid construction.

Compared with the existing technology, this utility model provides an integrally hoisted and prefabricated steel-concrete composite small box beam, which has the following beneficial effects:

(1) The structure of the present utility model is suitable for large spans and can be used for long-span bridges where local nodes span key line locations.

(2) The steel-concrete composite small box beam of the present utility model adopts the same shape, web slope and beam spacing as the conventional precast concrete small box beam, and has better landscape coordination with the conventional precast concrete small box beam.

(3) A single prefabricated steel-concrete composite beam is prefabricated in the factory to form a steel-concrete composite structure and then hoisted to the bridge as a whole to make full use of its combined stress performance. Compared with the composite structure where the steel beams are installed first and then the concrete bridge deck is poured , can improve the stress performance of composite beams and reduce the amount of steel used in steel beams; in addition, the hoisting weight of a single steel-concrete composite beam is small, and the requirements for hoisting machinery are low. The overall hoisting saves the cost of temporary piers, large-scale cast-in-place and other measures. , and achieve rapid construction.

(4) In addition to providing transverse ribs and diaphragms, prefabricated steel beams adopt closed-section structures within a certain range of the beam ends to improve the torsional performance of the overall structure; cross-connected structures are set up at certain intervals between prefabricated steel beams to make the structure integral. It has good performance, and the cross-connection structure between the prefabricated steel beams is connected by bolts, which is conducive to factory-based prefabrication and rapid construction.

(5) Set up reserved notches for continuous bridge deck, and use the longitudinal bridge deck continuous structure in the longitudinal direction between the prefabricated steel-concrete composite small box girders, and between the steel-concrete composite small box girders and the precast concrete small box girders. Continuous connection and simple construction technology; the longitudinal bridge deck continuous structure and the transverse wet joint structure are cast and formed by ultra-high performance concrete, taking advantage of the strong holding force of ultra-high performance concrete; the longitudinal bridge deck continuous structure and the transverse wet joint structure are The steel bars in between can be connected by lap joints, which greatly reduces the workload of welding such steel bars in conventional structures and further achieves rapid construction.

(6) The use of concrete bridge decks with gradient heights can reduce the weight of the structure and improve the spanning capacity of the structure.

(7) Through the above optimization measures for the design of steel-concrete composite small box girders, we will improve the overall and local stress of the bridge, improve the construction technology of steel-concrete composite small box girders, achieve unification with precast concrete small box girders, and ensure that the upper part of the bridge The standardization, mechanization, factoryization and rapid construction of the structure save investment and maximize benefits.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description These are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a plan view of the steel-concrete composite small box girder of the present utility model;

Figure 2 is an elevation view of the steel-concrete composite small box beam of the present utility model;

Figure 3 is an enlarged schematic diagram of M in Figure 2;

Figure 4 is a cross-sectional view along the C-C direction in Figure 1;

Figure 5 is an enlarged schematic diagram of the N position in Figure 4;

Figure 6 is a cross-sectional view along the D-D direction in Figure 1;

Figure 7 is a cross-sectional view along the E-E direction in Figure 1;

FIG. 8 is a cross-sectional view along the F-F direction in FIG. 1 .

Reference signs: 1. Steel-concrete composite beam; 11. Prefabricated steel beam; 111. Steel beam bottom plate; 112. Steel beam web; 113. Steel beam top plate; 114. Transverse rib; 115. Diaphragm; 116. Passage hole; 117. Connecting plate; 12. Precast concrete bridge deck; 121. Reserved notch; 13. Bolt; 14. Closed section roof; 2. Longitudinal bridge deck continuous structure; 3. Transverse wet joint structure; 4. Splicing joints; 5. Horizontal structure; 51. Horizontal bottom plate; 52. Horizontal top plate; 53. Horizontal web; 54. Horizontal reinforcing ribs; 6. Bolts; L1, span length of steel-concrete composite beam ; L2, the length of the closed section structure; h1, the total beam height of the steel-concrete composite beam; h2, the height of the prefabricated steel beam; h3, the maximum bridge deck thickness; h4, the minimum bridge deck thickness; B1, the bridge deck width; B2, spacing between steel-concrete composite beams; B3, spacing at the top of steel beam webs.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below through detailed embodiments and in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

Please refer to Figures 1 to 8. This embodiment provides an integrally hoisted prefabricated steel-concrete composite small box girder, which includes several steel-concrete composite beams 1 distributed in parallel along the transverse bridge deck. Each of the steel-concrete composite beams 1 includes precast steel beams 11 and precast concrete bridge decks 12 assembled and connected up and down. The prefabricated steel beam 11 includes a steel beam bottom plate 111, steel beam webs 112 symmetrically fixed above both sides of the steel beam bottom plate 111, and two steel beam top plates 113 respectively supporting the bottom surfaces of both sides of the precast concrete bridge deck 12. The upper surface of the steel beam top plate 113 is connected to the precast concrete bridge deck 12 using studs 13, and the lower surface of the steel beam top plate 113 is fixedly connected to the upper part of the steel beam web 112 on the same side. The steel girder top plate is located on top of the precast steel girder as its upper flange and bears compressive stress to support the precast concrete bridge deck. The webs of the steel beams are made of steel plates to withstand the shear stress of the superstructure, and their upper opening width and slope are consistent with conventional precast concrete small box beams. The bottom plate of the steel beam is made of rectangular steel plate to withstand the effect of tensile stress. The precast concrete bridge deck is produced using factory prefabrication methods and is installed on top of the precast steel beams via studs before being hoisted with the steel-concrete composite beams. The precast concrete bridge deck 12 is provided with reserved notches 121 for forming the longitudinal bridge deck continuous structure 2 at both ends along the longitudinal bridge deck, and is provided between two adjacent precast concrete bridge decks 12 along the transverse bridge deck direction. There are splice seams 4 for forming the transverse wet joint structure 3. The transverse wet joint structure is used to connect the top precast concrete bridge deck into a whole, and the longitudinal bridge deck connection structure is set in the reserved slots between adjacent beam spans to achieve the continuity of the simply supported beam deck.

In this embodiment, with reference to Figures 1, 3 to 5, as an example, the span length L1 of the steel-concrete composite beam is 45m, the total beam height h1 of the steel-concrete composite beam is 2.1m, and the bridge deck width B1 is 2.1m. 21m, the distance B2 between steel-concrete composite beams is 2950mm, and 7 steel-concrete composite beams are set along the transverse bridge deck direction. The height h2 of the prefabricated steel beam is taken as 1850mm; the thickness of the steel beam top plate is taken as 20mm, and the width of the steel beam top plate is taken as 400mm; the thickness of the steel beam web is taken as 14mm, the slope of the steel beam web is taken as 1:4, and the top spacing B3 of the steel beam web is taken as 1770mm; The thickness of the steel beam bottom plate is 24mm~32mm, with the larger value at mid-span. The width of the splicing seam is 400mm; the length of the reserved notch is 1200mm, and the depth of the reserved notch is 100mm.

In some specific embodiments, with reference to Figures 1 and 6, two steel beam webs 112 on the same prefabricated steel beam 11 are vertically connected with a number of transverse ribs 114. The upper and lower ends of the transverse ribs 114 are respectively connected to The steel beam top plate 113 and the steel beam bottom plate 111 on the same side are fixedly connected. By setting transverse ribs, the interior of the box girder can be stiffened and the torsional distortion resistance of the box girder can be improved.

In some specific embodiments, with reference to Figures 1, 4, 5 and 8, several transverse partitions 115 are connected along the length direction inside the prefabricated steel beam 11, and the edges of the transverse partitions 115 are respectively connected with the steel beams 115. The beam top plate 113, the steel beam web 112, and the steel beam bottom plate 111 are fixedly connected. By setting up transverse partitions, the interior of the box girder can be stiffened and the torsional distortion resistance of the box girder can be improved. Specifically, a through hole 116 is opened in the middle of the diaphragm 115 .

As an example, two adjacent transverse partitions 115 are arranged at a distance of 6m; the transverse ribs 114 are distributed at a distance of 2m along the length direction of the prefabricated steel beam 11, and the transverse ribs 114 and the transverse partitions 115 are distributed at a distance of 2m.

In some specific embodiments, referring to Figures 1, 4 and 5, the steel beam webs 112 on two adjacent steel-concrete composite beams 1 along the transverse bridge deck direction are connected using a transverse connection structure 5. By setting up a cross-link structure, the integrity of the bridge can be improved.

Specifically, as shown in Figure 5, the cross-connected structure 5 is an I-shaped steel cross-section structure. The cross-connected structure 5 includes a cross-connected bottom plate 51, a cross-connected top plate 52, and a cross-connected bottom plate 51 and a cross-connected top plate 52. The cross-connected web 53 is provided with cross-connected reinforcing ribs 54 at both ends respectively connecting the cross-connected bottom plate 51 and the cross-connected top plate 52. The steel beam web 112 on the prefabricated steel beam 11 is provided with a cross-connected reinforcing rib 54 at both ends. The connecting plate 117 of the horizontal connection structure 5 is extended, and the horizontal connection web 53 and the connecting plate 117 are connected by bolts 6 . As an example, the horizontal structures are distributed at intervals of 10.5m to 12m along the longitudinal bridge deck direction.

In some specific embodiments, with reference to Figures 1 and 5, a closed section roof plate 14 connected to the steel beam roof plate 113 is provided at both ends of the prefabricated steel beam 11. The closed section roof plate 14 and two steel beam roof plates 113 , the two steel beam webs 112 and the steel beam bottom plate 111 together form a closed cross-section structure. In this way, the use of closed-section cross-section structures within a certain range at both ends of the prefabricated steel beams can improve the torsional performance of the structure and improve the stability of the steel-concrete composite small box beams during hoisting and use. As an example, the length L2 of the closed cross-section structure is 2800.

In some specific embodiments, as shown in Figure 5, the thickness of the precast concrete bridge deck 12 is set at a gradient height, and the precast concrete bridge deck 12 has the maximum deck thickness at the location connected to the steel beam top plate 113. h3, the middle part of the precast concrete bridge deck 12 has the minimum bridge deck thickness h4. The use of concrete bridge decks with gradient heights can reduce the structural weight and improve the span capacity of the structure. As an example, the maximum bridge deck thickness h3 is 250mm, and the minimum bridge deck thickness h4 is 200mm.

In some specific embodiments, the longitudinal bridge deck continuous structure 2 and the transverse wet joint structure 3 are cast and formed using ultra-high performance concrete. In this way, the strong holding force of ultra-high performance concrete can be utilized to provide an overall Connection strength.

In some specific embodiments, the reserved notches 121 and the splicing seams 4 are both provided with extended reserved steel bars. The steel bars located in the longitudinal bridge deck continuous structure are different from the steel bars located in the transverse wet joint structure. The steel bars are connected in an overlapping manner, which greatly reduces the workload of welding such steel bars in conventional structures and further enables rapid construction. As an example, the extended length of the reserved steel bars is 35cm.

During construction, the main processes of the rapid construction method of integrally hoisting prefabricated steel-concrete composite small box girders can be divided into production and preparation of prefabricated steel beams, welding studs, production and preparation of prefabricated concrete bridge decks, and transportation of prefabricated and installed steel-concrete composite boxes. Composite beams, hoisting steel-concrete composite beams and installing horizontal structures, cast-in-place transverse wet joint structures and longitudinal bridge deck continuous structures, cast-in-place leveling layers, and installation of auxiliary equipment. The on-site construction procedures are consistent with those of precast concrete small box girders to ensure Realize standardization, mechanization, factoryization and rapid construction.

Specific operations can adopt conventional bridge construction operations. For bridges with limited transportation conditions at the bridge location that cannot be transported across the entire span, they are allowed to be transported to the construction site in sections, and the steel-concrete composite beams can be hoisted after the assembly is completed and the composite structure is formed.

The above descriptions are only preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in within the protection scope of this utility model.

In addition, it should be understood that although this specification is described in terms of implementations, not each implementation only contains an independent technical solution. This description of the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole. , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (10)

1. An integrally hoisted prefabricated steel-concrete composite small box girder, including several steel-concrete composite beams distributed in parallel along the transverse bridge deck, characterized in that: each of the steel-concrete composite beams includes prefabricated steel beams assembled and connected up and down. and a precast concrete bridge deck. The precast steel beam includes a steel beam bottom plate, a steel beam web symmetrically fixed above both sides of the steel beam bottom plate, and two steel beam top plates respectively supporting the bottom surfaces of both sides of the precast concrete bridge deck. The steel beam The upper surface of the roof plate is connected to the precast concrete bridge deck using bolts, and the lower surface of the steel beam roof plate is fixedly connected to the upper part of the steel beam web plate on the same side; the precast concrete bridge deck is provided at both ends along the longitudinal bridge deck. There are reserved slots for forming the longitudinal bridge deck continuous structure, and there are splicing joints for forming the transverse wet joint structure between two adjacent precast concrete bridge decks along the transverse bridge deck direction. 2. The integral hoisting prefabricated steel-concrete composite small box beam according to claim 1, characterized in that: the two steel beam webs on the same prefabricated steel beam are vertically connected with a number of transverse ribs, and the upper and lower transverse ribs are connected vertically. Both ends are fixedly connected to the steel beam top plate and steel beam bottom plate located on the same side. 3. The integral hoisting prefabricated steel-concrete composite small box beam according to claim 2, characterized in that: the interior of the prefabricated steel beam is connected with several transverse partitions along the length direction, and the edges of the transverse partitions are respectively connected with the steel The beam top plate, steel beam web plate and steel beam bottom plate are fixedly connected. 4. The integrally hoisted and prefabricated steel-concrete composite small box beam according to claim 3, characterized in that: a through hole is provided in the middle of the transverse partition. 5. The integrally hoisted prefabricated steel-concrete composite small box girder according to claim 1, characterized in that: the steel beam webs on the two adjacent steel-concrete composite beams along the transverse bridge deck direction are connected by a horizontal connection structure. 6. The integral hoisting prefabricated steel-concrete composite small box beam according to claim 5, characterized in that: the cross-connected structure is an I-shaped steel cross-section structure, and the cross-connected structure includes a cross-connected bottom plate, a cross-connected top plate and The transverse web is connected between the transverse bottom plate and the transverse top plate. The transverse web is provided with transverse reinforcing ribs at both ends that connect the transverse bottom plate and the transverse top plate respectively. The steel beam web on the prefabricated steel beam is provided with There are connecting plates extending towards the cross-connected structure, and bolts are used to connect the cross-connected webs and the connecting plates. 7. The integrally hoisted prefabricated steel-concrete composite small box beam according to claim 1, characterized in that: there are closed section roof plates connected to the steel beam roof plates at both ends of the prefabricated steel beam, and the closed section roof plate, two The top plate of the steel beam, the web plates of the two steel beams and the bottom plate of the steel beam together form a closed cross-section structure. 8. The integrally hoisted prefabricated steel-concrete composite small box girder according to claim 1, characterized in that: the thickness of the precast concrete bridge deck is set at a gradient height, and the precast concrete bridge deck is connected to the top plate of the steel beam. The middle part of the precast concrete bridge deck has the smallest deck thickness. 9. The integrally hoisted and prefabricated steel-concrete composite small box girder according to claim 1, characterized in that: the longitudinal bridge deck continuous structure and the transverse wet joint structure are cast and formed by ultra-high performance concrete. 10. The integrally hoisted prefabricated steel-concrete composite small box girder according to claim 1, characterized in that: the reserved notches and the splicing joints are equipped with extended reserved steel bars located on the longitudinal bridge deck. The steel bars in the continuous structure are connected to the steel bars in the transverse wet joint structure by lap joints.