Composite beam suitable for cantilever structure

Abstract

The composite beam suitable for the cantilever structure comprises a steel structure, a bridge deck slab composite connecting assembly and a UHPC bridge deck slab, the bridge deck slab composite connecting assembly comprises a plurality of transverse steel channels, shear nail assemblies, transverse steel bars and longitudinal steel bar assemblies, and the transverse steel channels are distributed at the top of the steel structure at intervals in the longitudinal bridge direction; the shear nail assemblies are connected to the top of the steel structure, the shear nail assemblies are arranged between every two adjacent transverse steel channels, and rib penetrating holes are formed in the transverse steel channels. According to the UHPC combined bridge deck system adopting the steel top plate, the transverse channel steel and the shear nails, the overall rigidity is greatly improved compared with that of an all-steel bridge deck or a concrete bridge deck, the transverse channel steel participates in transverse stress of the bridge deck system, the bearing capacity of the cantilever end of the bridge deck can be greatly improved, and the UHPC combined bridge deck system is particularly suitable for a large cantilever structure; the transverse channel steel is provided with the steel bar penetrating holes in advance, temporary cushion blocks during steel bar binding can be omitted, the thickness of a concrete protection layer of the bridge deck can be accurately controlled, and the structural durability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge technical field especially a combined beam suitable for cantilever structure. BACKGROUND

[0002] At present, two prominent technical problems exist in cantilever bridge: the self-weight of cantilever end structure is too large and the deck slab is easy to crack. The self-weight of cantilever end structure can cause the excessive bending moment of cantilever root, which can easily cause insufficient bearing capacity and is one of the main reasons causing the deck slab to crack. These two problems seriously restrict the safety, durability and applicability of cantilever bridge.

[0003] The traditional steel bridge deck slab or concrete bridge deck slab is difficult to solve the above two problems at the same time. Although the steel bridge deck slab has a lighter self-weight, it has insufficient rigidity and is easy to crack under the action of vehicle load; while the concrete bridge deck slab has higher rigidity, but has a large self-weight, which is not conducive to the stress of cantilever end. In addition, the construction process of the traditional bridge deck slab also needs to be improved, the on-site reinforcement binding efficiency is low, and the thickness of the concrete protective layer is difficult to control, which affects the construction quality and durability of the bridge deck slab.

[0004] Therefore, it is necessary to provide a combined beam suitable for cantilever structure to solve or at least alleviate the above problems. SUMMARY

[0005] The main purpose of the utility model is to provide a combined beam suitable for cantilever structure to solve the problems of large self-weight of bridge cantilever end structure and low reinforcement binding efficiency in the prior art.

[0006] To achieve the above purpose, the utility model provides a combined beam suitable for cantilever structure, which comprises a steel structure, a bridge deck slab composite connecting assembly and a UHPC bridge deck slab; wherein,

[0007] The UHPC bridge deck slab is laid and connected to the top of the steel structure, the bridge deck slab composite connecting assembly is built-in the UHPC bridge deck slab, and the bridge deck slab composite connecting assembly comprises a plurality of transverse channel steels, shear pin assemblies, transverse steels and longitudinal steel assemblies; wherein,

[0008] A plurality of transverse channel steels are arranged on the top of the steel structure along the longitudinal bridge direction, the shear pin assemblies are connected to the top of the steel structure, and the shear pin assemblies are arranged between every two adjacent transverse channel steels, the transverse channel steels are provided with a reinforcing hole, the longitudinal steel assemblies penetrate through the reinforcing hole, the transverse steels are connected to the longitudinal steel assemblies, and one transverse steel is arranged between every two adjacent transverse channel steel assemblies.

[0009] Preferably, each of the shear pin assemblies comprises a plurality of shear pin units arranged along the longitudinal bridge direction, each of the shear pin units comprising a plurality of shear pins arranged along the transverse bridge direction.

[0010] Preferably, the number of the shear pin units in each of the shear pin assemblies is two, and the two shear pin units are oppositely arranged along the longitudinal bridge direction on both sides of the transverse steel bar.

[0011] Preferably, the transverse channel steel is in an inverted L shape.

[0012] Preferably, the steel structure comprises a steel bottom plate, a steel top plate and a plurality of steel webs arranged along the transverse bridge direction, the steel bottom plate being connected to bottom ends of the steel webs, the steel top plate being connected to top ends of the steel webs, and the transverse channel steel and the shear pin assemblies being connected to the top of the steel top plate.

[0013] Preferably, the steel webs are corrugated steel webs.

[0014] Preferably, the longitudinal steel bar assembly comprises a plurality of first longitudinal steel bars and a plurality of second longitudinal steel bars staggered and arranged along the transverse bridge direction, the first longitudinal steel bars and the second longitudinal steel bars each penetrating the through-hole on the transverse channel steel, both ends of the first longitudinal steel bar extending out of the UHPC bridge deck, and the second longitudinal steel bar being embedded in the UHPC bridge deck.

[0015] Preferably, the interval distance between each two adjacent transverse channel steels is 50-60 cm.

[0016] Preferably, a plurality of flange stiffening ribs are arranged along the longitudinal bridge direction between the flange section of the steel top plate and the outer side of the steel web.

[0017] Preferably, the interval distance between each two adjacent shear pins in each of the shear pin units is 15-30 cm.

[0018] Compared with the prior art, the steel bridge structure has the following beneficial effects:

[0019] This utility model provides a composite beam suitable for cantilever structures, including a steel structure, a bridge deck composite connection assembly, and a UHPC bridge deck. The UHPC bridge deck is laid and connected to the top of the steel structure. The bridge deck composite connection assembly is built into the UHPC bridge deck. The bridge deck composite connection assembly includes multiple transverse channel steels, shear stud assemblies, transverse reinforcing bars, and longitudinal reinforcing bar assemblies. The multiple transverse channel steels are spaced apart along the longitudinal direction of the bridge on the top of the steel structure. The shear stud assemblies are connected to the top of the steel structure, and a shear stud assembly is provided between every two adjacent transverse channel steels. Through holes are opened on the transverse channel steels, and longitudinal reinforcing bar assemblies pass through the through holes. The transverse reinforcing bars are connected to the longitudinal reinforcing bar assemblies, and a transverse reinforcing bar is evenly distributed between every two adjacent transverse channel steel assemblies. By adopting a UHPC composite bridge deck system consisting of a steel top plate, transverse channel steel, and shear studs, the overall stiffness is significantly improved compared to traditional steel or concrete bridge decks. Furthermore, the transverse channel steel participates in the lateral stress of the bridge deck system, which can greatly improve the load-bearing capacity of the cantilever end of the bridge deck, making it particularly suitable for large cantilever structures. The transverse channel steel is pre-drilled with through holes for rebar to pass through, which can eliminate the need for temporary spacers during rebar tying and allows for precise control of the concrete cover thickness of the bridge deck, thus improving structural durability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a partial schematic diagram of the overall structure in one embodiment of the present utility model;

[0022] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0023] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0024] Explanation of icon numbers:

[0025] 10. Steel structure; 110. Steel bottom plate; 120. Steel top plate; 130. Steel web; 140. Flange stiffeners; 20. Bridge deck composite connection assembly; 210. Transverse channel steel; 211. Through-reinforcement holes; 220. Shear studs; 230. Transverse reinforcement; 240. Longitudinal reinforcement assembly; 241. First longitudinal reinforcement; 242. Second longitudinal reinforcement; 30. UHPC bridge deck. Detailed Implementation

[0026] It should be understood that the specific embodiments described herein are merely exemplary and are not intended to limit the present application.

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0029] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0030] Please refer to the drawings Figures 1-2 In an embodiment of the present application, a composite beam suitable for a cantilever structure includes a steel structure 10, a bridge deck panel composite connection assembly 20, and a UHPC bridge deck panel 30. First of all, it should be noted that in the prior art, the bearing capacity of the cantilever structure is usually increased by increasing the reinforcement and increasing the thickness of the concrete bridge deck panel, but this will increase the cost, increase the self-weight of the cantilever end, and more easily cause the bridge deck panel to crack, reducing the service durability of the bridge. The present application solves the above-mentioned defects in the prior art by providing a composite beam suitable for a cantilever structure, as follows:

[0031] The UHPC bridge deck 30 is laid on the top of the steel structure 10, the bridge deck composite connection assembly 20 is embedded in the UHPC bridge deck 30, the bridge deck composite connection assembly 20 comprises a plurality of transverse channel steels 210, shear stud 220 assemblies, transverse steels 230 and longitudinal steel assemblies 240; wherein the plurality of transverse channel steels 210 are arranged on the top of the steel structure 10 in the longitudinal bridge direction, the shear stud 220 assemblies are connected to the top of the steel structure 10, and the shear stud 220 assemblies are arranged between every two adjacent transverse channel steels 210, the transverse channel steels 210 are provided with through holes 211, the longitudinal steel assemblies 240 pass through the through holes 211, the transverse steels 230 are connected to the longitudinal steel assemblies 240, and one transverse steel 230 is arranged between every two adjacent transverse channel steel 210 assemblies.

[0032] Specifically, the composite beam suitable for the cantilever structure in the application comprises a steel structure 10, a bridge deck composite connection assembly 20 and a UHPC bridge deck 30, the composite beam adopts a combination of the steel structure 10 and concrete, can reduce the structure weight and improve the span capacity, the steel structure 10 serves as the main force-bearing body, and the bridge deck adopts the ultra-high performance concrete and is laid on the top of the steel structure 10; the bridge deck composite connection assembly 20 is used for enhancing the structural rigidity and bearing capacity of the UHPC bridge deck 30.

[0033] The bridge deck composite connecting assembly 20 comprises a plurality of transverse channel steels 210, shear bolt 220 assemblies, transverse steel bars 230 and longitudinal steel bar assemblies 240, and the transverse channel steels 210 can also participate in the transverse stress of the bridge deck system in addition to the transverse steel bars 230, so as to further improve the carrying capacity of the cantilever end of the bridge deck slab, and the transverse channel steels 210 are connected to the top of the steel structure 10 and embedded in the UHPC bridge deck slab 30 to be formed, so as to bear stress in cooperation with the bridge deck structure, and the overall stiffness of the bridge deck slab can be significantly improved, and in a preferred embodiment of the application, the transverse channel steels 210 can be arranged in an inverted L shape, and the channel steels originally in a groove shape can be cut in half to form two L-shaped transverse channel steels 210, so that the material utilization rate is higher, and the construction cost is saved, and preferably, the interval distance between every two adjacent transverse channel steels 210 can be 50cm-60cm, and the specific value can be determined comprehensively according to the internal steel bar distribution and the carrying capacity distribution of the bridge deck slab; and the transverse channel steels 210 are provided with penetrating holes 211 for the longitudinal steel bar assemblies 240 to penetrate and connect, so that the overall structure can be improved after being connected with the steel bars, and due to the penetrating holes 211, temporary cushion blocks required for steel bar binding can be saved during construction, and the thickness of the concrete cover of the bridge deck slab can be accurately controlled by the characteristic that the transverse channel steels 210 are uniformly prefabricated in the factory during hole opening; the shear bolt 220 assemblies are used for resisting shear force, so as to maximize the respective advantages of steel and concrete, to transfer the interface shear force, limit the interface slip, prevent the concrete from being lifted, ensure that the steel and the concrete bear stress and deform in coordination, and therefore the shear bolt 220 assemblies are also connected to the top of the steel structure 10 to jointly act after the UHPC bridge deck slab 30 is formed, and it can be understood that the shear bolt 220 assemblies are arranged between every two adjacent transverse channel steels 210, so as to ensure that the effect is uniformly distributed, so as to form a UHPC combined bridge deck slab system of steel structure top plate-channel steel-shear bolt, which greatly improves the durability of the structure, especially for the cantilever end structure of the bridge with high stiffness requirement, so that the reinforcement and the plate thickness do not need to be increased, the construction cost is saved, and cracking is reduced due to the coordination effect.

[0034] As a preferred embodiment of the application, each shear bolt 220 assembly comprises a plurality of shear bolts 220 units arranged at intervals in the longitudinal direction of the bridge, and each shear bolt 220 unit comprises a plurality of shear bolts 220 arranged at intervals in the transverse direction of the bridge.

[0035] It should be noted that the shear stud 220 assembly between each two adjacent transverse channel steel 210 can be arranged in multiple rows of shear stud 220 units, and each row also includes multiple shear studs 220 arranged at intervals in the transverse direction, so that the shear studs 220 are uniformly arranged at the top of the UHPC bridge deck 30 and the steel structure 10 to ensure sufficient bearing capacity improvement effect; preferably, the interval distance between the two adjacent shear studs 220 in each shear stud 220 unit is 15-30 cm, and the specific value can be determined according to the transverse width of the bridge deck and the number of shear studs 220 arranged.

[0036] As a preferred embodiment of the utility model, the number of shear stud 220 units in each shear stud 220 assembly is two, and the two shear stud 220 units are oppositely arranged on both sides of the transverse steel bar 230 in the longitudinal direction.

[0037] It should be noted that one transverse steel bar 230 is arranged between each two adjacent transverse channel steel 210, so that two shear stud 220 units are used in each shear stud 220 assembly to make the distribution more uniform, and the two shear stud 220 units are oppositely arranged on both sides of the transverse steel bar 230. For details, please refer to the drawings. Figure 2 .

[0038] As a preferred embodiment of the utility model, the steel structure 10 includes a steel bottom plate 110, a steel top plate 120, and multiple steel webs 130 arranged at intervals in the transverse direction, the steel bottom plate 110 is connected to the bottom end of the steel web 130, the steel top plate 120 is connected to the top end of the steel web 130, and the transverse channel steel 210 and the shear stud 220 assembly are both connected to the top of the steel top plate 120.

[0039] It should be noted that the steel structure beam section in the form of a steel box girder is formed by welding and fixing between the steel bottom plate 110, the steel web 130 and the steel structure 10, the number of steel webs 130 can be two, three or more to form at least one internal chamber for mounting the stiffening plate and the like inside to improve the structural rigidity, and the specific number can be set by those skilled in the art as needed, and the number of steel webs 130 in the present application is three, and the steel web 130 adopts a corrugated steel web. The corrugated steel web has a lighter self-weight than the traditional steel web, can be free of web stiffening ribs, is convenient to prefabricate, has good fatigue performance and crack propagation resistance.

[0040] Further, the longitudinal steel bar assembly 240 comprises a plurality of first longitudinal steel bars 241 and second longitudinal steel bars 242 staggered and spaced along the transverse direction, the first longitudinal steel bars 241 and the second longitudinal steel bars 242 each penetrating the steel bar penetrating hole 211 on the transverse channel steel 210, and the two ends of the first longitudinal steel bars 241 protrude out of the UHPC bridge deck 30, and the second longitudinal steel bars 242 are embedded in the UHPC bridge deck 30.

[0041] It should be understood that the length of the first longitudinal steel bar 241 is longer than that of the second longitudinal steel bar 242, and the two ends of the first longitudinal steel bar 241 protrude out of the UHPC deck to facilitate lap joint connection with the longitudinal steel bars of another segment, improve the connection integrity between segments, and in another preferred embodiment, end plates can also be provided at the ends of the first longitudinal steel bars 241, so that after pouring the slurry at the joint, the end plates cooperate with the slurry to resist the tensile force of the steel bars.

[0042] Further, a plurality of flange stiffening ribs 140 are arranged between the flange sections of the steel top plate 120 and the outer sides of the steel web 130 along the longitudinal direction.

[0043] It should be noted that the flange stiffening ribs 140 are used to improve the structural rigidity of the flange sections on both sides of the steel top plate 120 protruding along the transverse direction, and by supporting the flange stiffening ribs 140 between the flange sections of the steel top plate 120 and the outer sides of the steel web 130, the strength of the flange sections is ensured.

[0044] The above is only a preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A composite beam suitable for use in a cantilever structure, characterised in that, The steel structure, the bridge deck panel composite connecting assembly and the UHPC bridge deck panel are provided. The UHPC bridge deck panel is laid on the top of the steel structure, and the bridge deck panel composite connecting assembly is embedded in the UHPC bridge deck panel. The plurality of transverse channel steels are arranged on the top of the steel structure in a longitudinal bridge direction, the shear pin assembly is connected to the top of the steel structure, and the shear pin assembly is arranged between every two adjacent transverse channel steels.

2. The composite beam suitable for use in a cantilever structure according to claim 1, wherein, Each shear pin assembly comprises a plurality of shear pin units arranged in a longitudinal bridge direction.

3. The composite beam suitable for use in a cantilever structure according to claim 2, wherein, The number of shear pin units in each shear pin assembly is two, and the two shear pin units are oppositely arranged on both sides of the transverse steel in a longitudinal bridge direction.

4. The composite beam suitable for use in a cantilever structure according to claim 1, wherein, The transverse channel steel is in an inverted L shape.

5. The composite beam suitable for use in a cantilever structure according to claim 1, wherein, The steel structure comprises a steel bottom plate, a steel top plate and a plurality of steel webs arranged in a transverse bridge direction, the steel bottom plate is connected to the bottom end of the steel web, the steel top plate is connected to the top end of the steel web, and the transverse channel steel and the shear pin assembly are connected to the top of the steel top plate.

6. The composite beam suitable for use in a cantilever structure according to claim 5, wherein, The steel web is a corrugated steel web.

7. The composite beam suitable for use in a cantilever structure according to claim 1, wherein, The longitudinal reinforcement assembly comprises a plurality of first longitudinal reinforcements and second longitudinal reinforcements staggered and arranged in a transverse bridge direction, the first longitudinal reinforcement and the second longitudinal reinforcement each penetrate the through-hole on the transverse channel steel, the two ends of the first longitudinal reinforcement protrude from the UHPC bridge deck panel, and the second longitudinal reinforcement is embedded in the UHPC bridge deck panel.

8. The composite beam suitable for use in a cantilever structure according to claim 1, wherein, The interval distance between every two adjacent transverse channel steels is 50-60 cm.

9. The composite beam suitable for use in a cantilever structure according to claim 5, wherein, A plurality of flange stiffening ribs are arranged in a longitudinal bridge direction between the flange section of the steel top plate and the outer side of the steel web.

10. The composite beam suitable for use in a cantilever structure according to claim 2, wherein, The interval distance between every two adjacent shear pins in each shear pin unit is 15-30 cm.

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