CN213978594U

CN213978594U - Steel-concrete-UHPC combined bridge deck

Info

Publication number: CN213978594U
Application number: CN202022786072.7U
Authority: CN
Inventors: 马晓刚; 张大伟; 刘超; 凌宏伟; 郭松松; 李京; 张强; 沈慧捷
Original assignee: Shanghai Pudong Architectural Design & Research Institute Co ltd
Current assignee: Shanghai Pudong Architectural Design & Research Institute Co ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-08-17
Anticipated expiration: 2030-11-26

Abstract

The utility model relates to a steel-concrete-UHPC combination decking, including end steel sheet, ordinary concrete layer and UHPC ultra high performance concrete layer, end steel sheet links to each other with existing bridge, and ordinary concrete layer pours on end steel sheet, and UHPC ultra high performance concrete layer pours on ordinary concrete layer, constitutes steel-concrete-UHPC combination decking. Compared with the prior art, the utility model has the advantages of effectively improve the crack resistance of the reason of decking and draw the district, have better economic value, security height, full play material performance etc.

Description

Steel-concrete-UHPC combined bridge deck

Technical Field

The utility model belongs to the technical field of bridge engineering technique and specifically relates to a steel-concrete-UHPC combination decking.

Background

The shrinkage deformation of the cast-in-place concrete bridge deck of the traditional steel-concrete composite beam is restrained by the steel beam, additional tensile stress along the longitudinal direction of the longitudinal bridge can be generated in the construction stage, and even micro cracks which cannot be observed by naked eyes can be generated; the combination of the tensile stress caused by the passing vehicle load and the tensile stress generated in the early stage can generate a transverse crack on the bottom surface of the bridge deck; with the long-term action of vehicle load, the longitudinal cracks are generated to form a crisscross shape and penetrate through the upper surface of the bridge deck; along with the loss of aggregate engaging force between crack surfaces, the shearing resistance of the bridge deck is gradually reduced, and more cracks are generated; when the vehicle load exceeds its shear strength, the concrete begins to fall off and fail. In addition, the temperature rise of the top surface of the bridge deck caused by asphalt paving, temperature effect and the like can also cause the lower edge of the bridge deck to be in an overall tensile state, and the upper edge of the bridge deck is also in a tensile state in a bridge hogging moment area or when a large cantilever structure of the bridge deck is adopted.

Under above unfavorable state, the bridge floor phenomenon of damage, fracture, concrete spalling appears easily, influences driving comfort, has reduced bridge rigidity, has increased the cost of bridge operation maintenance simultaneously. The existing method for solving the cracking of the bridge deck slab in the tension state mainly comprises the steps of increasing the slab thickness or configuring anti-cracking reinforcing steel bars or prestressed steel bundles in the area so as to prevent the concrete from cracking or limit the crack width of the concrete, but the design usually takes experience as a main part, and the construction of the bridge deck slab with the small thickness is complex, the prestress loss is serious, and the construction quality is not easy to guarantee. As UHPC materials have developed in the field of civil engineering, a number of expert scholars have used them in the design of bridge decks to form UHPC deck structures. UHPC is a novel cement-based structural engineering material. The compressive strength of the material exceeds 150MPa, the tensile strength exceeds 7MPa, and the service life of the material exceeds 200 years. The components mainly comprise silica fume, cement, fine aggregate, steel fiber and the like, and the coarse aggregate is not contained. Based on the maximum compactness theory, the method reduces the gaps and microcracks in the material as much as possible in the preparation process, and gives full play to the strength of the material so as to obtain ultrahigh strength and durability. However, for the bridges with medium and large span, because of large span, the cost of the UHPC bridge deck is high, the construction cost is increased, and in the area with small tensile stress of the top plate, the effect that the UHPC bridge deck is completely adopted is not obvious.

A combined bridge deck structure of steel-UHPC prefabricated plates and a construction method thereof are disclosed in Chinese patent CN 110468708A, the combined bridge deck structure in the patent adopts UHPC prefabricated plates laid on a steel bridge deck, and the UHPC prefabricated plates are closely attached to the steel bridge deck through connecting pieces with pre-tightening functions, so that adverse factors such as vibration, impact, noise and the like caused by the existence of gaps between the UHPC prefabricated plates and the steel bridge deck under the action of wheel load are avoided, the service performance and the durability of the combined bridge deck structure are improved, but the steel bridge deck cannot be completely flattened due to welding deformation of a steel structure, gaps and stress concentration areas are caused between the UHPC prefabricated plates and the steel bridge deck, and the steel bridge deck and the UHPC prefabricated plates are adversely affected after the pre-tightening connecting pieces are stressed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects of the prior art and providing a steel-concrete-UHPC combined bridge deck which effectively improves the crack resistance of the upper edge of the bridge deck in the tension area, has better economic value and high safety and fully exerts the material performance.

The purpose of the utility model can be realized through the following technical scheme:

a steel-concrete-UHPC combined bridge deck slab comprises a bottom steel plate, a common concrete layer and a UHPC ultrahigh-performance concrete layer; the bottom steel plate is connected with the existing bridge; the common concrete layer is poured on the bottom steel plate; the UHPC ultrahigh-performance concrete layer is poured on a common concrete layer to form the steel-concrete-UHPC combined bridge deck.

Preferably, a joint surface is arranged between the common concrete layer and the UHPC ultrahigh-performance concrete layer.

More preferably, the bonding surface is a rough bonding surface obtained by roughening treatment.

Preferably, the combined bridge deck is provided with a shear connector; the common concrete layer is connected with the bottom steel plate through a shear connector.

More preferably, the shear connectors are pegs.

More preferably, the shear connector is a T-shaped, plate-shaped, L-shaped or inverted U-shaped steel structure shear connector.

More preferably, the combined bridge deck is provided with perforated steel bars; round holes are arranged on the steel structure shear connector at equal intervals along the length direction of the steel plate; the perforated steel bar penetrates through the round hole and is arranged in the common concrete layer.

Preferably, a stressed steel bar is arranged in the UHPC ultrahigh-performance concrete layer.

More preferably, the stressed steel bars are arranged longitudinally and transversely in the UHPC ultrahigh-performance concrete layer.

Preferably, the combined bridge deck is provided with interface connecting steel bars, one end of each steel bar is connected with a common concrete layer, and the other end of each steel bar is connected with a UHPC ultrahigh-performance concrete layer.

Compared with the prior art, the utility model discloses following beneficial effect has:

the anti-cracking performance of a tension area on the upper edge of a bridge deck is effectively improved: the utility model provides a steel-concrete-UHPC combination decking adopts steel-concrete-UHPC's three-layer composite structure, regards the steel sheet as the bottom plate, and UHPC is as the panel, and the anti crack performance who draws the district on having improved the decking is showing durability, fatigue strength, bearing capacity and the rigidity that has improved the decking, compares with the ordinary concrete decking of equal thickness the utility model discloses the technique can make decking bearing capacity and rigidity improve 2 ~ 3 times.

Secondly, the method has better economic value: the utility model provides a steel-concrete-UHPC combination decking is used for the surface course of decking with the UHPC thin layer, compares with the decking is whole to use UHPC, and overall engineering cost is lower relatively, has better economic value.

Thirdly, the safety is high: the utility model provides a steel-concrete-UHPC combination decking is as the bottom plate of decking with the steel sheet, and the steel sheet provides the template for the construction of UHPC, concrete on the one hand, has reduced engineering cost, and the bridge floor damage produces the potential safety hazard to the undersbridge traffic during on the other hand steel sheet prevents to operate the maintenance.

Fourthly, the material performance is fully exerted: the utility model provides a steel-concrete-UHPC combination decking adopts steel-concrete-UHPC three-layer composite structure, regard the steel sheet as the bottom plate, the concrete is as the intermediate level, UHPC is as the panel, can full play material property, utilize UHPC's tensile strength to resist the decking and go up the reason and draw, be favorable to the bridge deck pavement layer construction again, utilize the concrete to fill the bulk rigidity who improves steel sheet local rigidity and decking on the steel sheet, use the steel sheet to resist the decking lower edge and draw, make steel-concrete-UHPC combination decking have fine tensile strength and the effective coordination performance between different materials.

Drawings

FIG. 1 is a schematic cross-sectional view of a medium steel-concrete-UHPC composite bridge deck structure of the present invention;

FIG. 2 is a schematic cross-sectional view of the middle sole steel plate and concrete adopting a stud connector of the present invention;

FIG. 3 is a cross-sectional view of the T-shaped steel plate connecting piece used for the insole steel plate and the concrete of the utility model;

FIG. 4 is a cross-sectional view of the middle sole steel plate and concrete adopting plate type steel plate connecting piece of the present invention;

FIG. 5 is a schematic cross-sectional view of the middle sole steel plate and concrete of the present invention using L-shaped steel plate connecting members;

fig. 6 is the utility model discloses the insole steel sheet adopts the section sketch map of the type of falling U steel sheet connecting piece with the concrete.

The reference numbers in the figures indicate:

1. the steel plate comprises a bottom steel plate, 2, a common concrete layer, 3, a UHPC layer, 4, a shear connector, 5, round holes, 6, a joint surface, 7, interface connection steel bars, 8, stressed steel bars, 9 and perforated steel bars.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In order to solve the problems in the prior art when the bridge deck made of common concrete is adopted, the fatigue resistance, rigidity, bearing capacity and durability of the bridge deck are improved. One effective method is to use steel plate and Ultra-high performance concrete (UHPC) to replace the common concrete of the tension part, the UHPC is an Ultra-high strength cement-based material with Ultra-high strength, high durability, high toughness and low void ratio, compared with the common concrete, it has very high compression strength and tensile strength, because the fine steel fiber dispersed in the UHPC can slow down the expansion of the micro-crack in the material greatly, thus the material shows Ultra-high toughness and ductility performance, the experimental data shows that the ultimate tensile strain of the UHPC is more than 15 times of the common concrete, the elastic modulus is more than 1.2 times of the common concrete, the fracture toughness of the material is more than 200 times of the common concrete, and it is wear-resistant and corrosion-resistant, and it can be used in bridge deck slab members to fully exert its material characteristics; the steel structure has high strength, good steel plasticity and toughness, is suitable for bearing dynamic load, does not have the problem of tensile cracking of concrete, has high material reliability, and can be used as a construction template; the stability problem of the steel plate can be solved after the concrete is filled with the steel plate, and the utilization efficiency and the bearing capacity of the structural material are improved.

Based on the theory, the utility model provides a steel-concrete-UHPC combined bridge deck structure, the structure is as shown in figure 1, the combined bridge deck structure comprises an UHPC ultra-high performance concrete layer 3, a common concrete layer 2 and a bottom steel plate 1; the ultra-high performance concrete layer 3 is poured on the common concrete layer 2, and the concrete layer 2 is poured on the bottom steel plate 1.

As shown in fig. 1, a rough joint surface 6 is arranged between the UHPC ultra-high performance concrete layer 3 and the ordinary concrete layer 2, and the joint surface 6 is processed in a chiseling mode.

Stress steel bars 8 which are longitudinally and transversely arranged are arranged in the ultra-high performance concrete layer 3, interface connecting steel bars 7 are arranged in the common concrete layer 2, one end of each interface connecting steel bar 7 is connected with the common concrete layer 2, and the other end of each interface connecting steel bar 7 is connected with the ultra-high performance concrete layer 3 made of UHPC.

Adopt shear connector 4 to be connected between end steel sheet 1 and ordinary concrete layer 2, shear connector 4 has two kinds of forms:

(1) a peg, the structure of which is shown in figure 2;

(2) the steel structure shear connector includes T-shaped, plate-shaped, L-shaped and inverted U-shaped steel structure shear connectors, the structures of which are shown in fig. 3, 4, 5 and 6, respectively, it should be noted that the steel structure shear connector is not limited to the above shapes, which are only a preferred way, and those skilled in the art can adopt other shapes of steel structure shear connectors.

If a steel structure shear connector is adopted, a perforated steel bar 9 needs to be arranged, and the specific arrangement method comprises the following steps: round holes 5 are arranged on the steel structure shear connector at equal intervals along the length direction of the steel plate, and the perforated steel bars 9 penetrate through the round holes 5 and are arranged in the common concrete layer 2.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The steel-concrete-UHPC combined bridge deck is characterized by comprising a bottom steel plate (1), a common concrete layer (2) and an UHPC ultrahigh-performance concrete layer (3); the bottom steel plate (1) is connected with the existing bridge; the common concrete layer (2) is poured on the bottom steel plate (1); and the UHPC ultrahigh-performance concrete layer (3) is poured on the common concrete layer (2) to form the steel-concrete-UHPC combined bridge deck.

2. The steel-concrete-UHPC combined bridge deck plate as claimed in claim 1, wherein a bonding surface (6) is arranged between the ordinary concrete layer (2) and the UHPC ultrahigh-performance concrete layer (3).

3. A steel-concrete-UHPC composite bridge deck according to claim 2, characterized in that said bonding surface (6) is a rough bonding surface obtained by roughening treatment.

4. A steel-concrete-UHPC composite bridge deck according to claim 1, wherein said composite bridge deck is provided with shear connectors (4); the common concrete layer (2) is connected with the bottom steel plate (1) through a shear connector (4).

5. A steel-concrete-UHPC composite bridge deck according to claim 4, characterized in that the shear connectors (4) are studs.

6. A steel-concrete-UHPC combined bridge deck according to claim 4, characterized in that the shear connectors (4) are T-shaped, plate-shaped, L-shaped or inverted U-shaped steel structure shear connectors.

7. A steel-concrete-UHPC composite bridge deck according to claim 6, characterized in that said composite bridge deck is provided with perforated steel bars (9); round holes (5) are arranged on the steel structure shear connector at equal intervals along the length direction of the steel plate; the perforated steel bars (9) penetrate through the round holes (5) and are arranged in the common concrete layer (2).

8. The steel-concrete-UHPC combined bridge deck plate as claimed in claim 1, wherein the UHPC ultra-high performance concrete layer (3) is internally provided with stressed steel bars (8).

9. A steel-concrete-UHPC combined bridge deck according to claim 8, characterized in that the stressed steel bars (8) are arranged longitudinally and transversely in the UHPC ultra-high performance concrete layer (3).

10. A steel-concrete-UHPC composite bridge deck according to claim 1, wherein said composite bridge deck is provided with interface connection reinforcements (7) having one end connected to the ordinary concrete layer (2) and the other end connected to the UHPC ultra high performance concrete layer (3).