Joint connection structure of section steel-UHPC (Ultra High Performance Concrete) combined bridge deck slab

Abstract

The utility model discloses a joint connecting structure of profile steel-UHPC (Ultra High Performance Concrete) combined bridge decks, which comprises a pair of profile steel-UHPC combined bridge decks which are adjacently arranged in the longitudinal bridge direction and a cast-in-place joint which is cast in place between the adjacent profile steel-UHPC combined bridge decks in the transverse bridge direction, and an embedded steel plate is arranged at one end, close to the cast-in-place joint in the transverse bridge direction, in the profile steel-UHPC combined bridge decks; one end of the pre-embedded steel plate extends between the profile steel and the UHPC plate, the other end of the pre-embedded steel plate extends into the transverse bridge direction cast-in-place joint, a shearing force connecting piece is arranged on the upper surface of the pre-embedded steel plate, and a shearing force connecting piece is arranged on the lower surface of the end, located on the transverse bridge direction cast-in-place joint, of the pre-embedded steel plate. The joint connection structure of the section steel-UHPC combined bridge deck slab has the advantages of being reliable in joint connection, high in structural connection performance and easy and convenient to prefabricate and construct on site.

Description

Technical Field

[0001] The utility model belongs to the field of bridge decks, and in particular relates to a seam connection structure of bridge decks. Background Art

[0002] The deck structure of steel bridges usually adopts orthotropic steel deck system, but because the steel deck is a fully welded structure, it is not only expensive, but also prone to fatigue cracking and local buckling under the action of heavy-loaded vehicles, endangering the safety of the bridge; at the same time, asphalt needs to be paved in the steel deck, and the asphalt pavement is frequently damaged, resulting in huge renovation costs. The above-mentioned defects reduce the operating efficiency of bridges and are recognized as a global problem in the field of steel bridges. my country has a large amount of heavy-loaded traffic, and the above-mentioned defects are particularly serious.

[0003] The use of steel-UHPC composite bridge decks (such as the bridge decks mentioned in patent application CN109972511A) has the advantages of high structural rigidity, strong fatigue resistance, and simple manufacturing. Using it to replace traditional orthotropic steel bridge decks can overcome the problems existing in traditional orthotropic steel bridge decks. However, the joint connection parts between steel-UHPC composite bridge decks are often the weak parts of the structure. In order to ensure the reliability of the joint connection, the traditional joint structure is generally more complicated. Whether it is the steel processing process or the subsequent construction process, there is a problem of difficulty in implementation. Therefore, it is necessary to propose a joint connection structure of a steel-UHPC composite bridge deck that can ensure the reliability of the joint connection and has the characteristics of simple structure, easy processing and construction. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies and defects mentioned in the above background technology and provide a joint connection structure of a steel-UHPC composite bridge deck which has a simple structure, is easy to process and construct, and has reliable joint connection.

[0005] In order to solve the above technical problems, the technical solution proposed by the utility model is:

[0006] A joint connection structure of a steel-UHPC composite bridge deck, the steel-UHPC composite bridge deck comprising a steel section and a UHPC plate arranged on the steel section, the joint connection structure comprising a pair of steel-UHPC composite bridge decks (arranged on a steel crossbeam) adjacent to each other in the longitudinal direction and a cast-in-place joint in the transverse direction cast-in-place between adjacent steel-UHPC composite bridge decks, an embedded steel plate is provided at one end of the steel-UHPC composite bridge deck near the cast-in-place joint in the transverse direction, one end of the embedded steel plate extends between the steel section and the UHPC plate, the other end of the embedded steel plate extends into the cast-in-place joint in the transverse direction, a shear connector is provided on the upper surface of the embedded steel plate, and a shear connector is provided on the lower surface of the embedded steel plate at one end of the cast-in-place joint in the transverse direction.

[0007] In the utility model, the shear connector can be a shear nail (such as a cylindrical head welding nail), the upper and lower planes of the embedded steel plate in the transverse bridge cast-in-place joint are uniformly welded with shear nails, which are used to connect the cast-in-place UHPC in the chamber and the cast-in-place UHPC on the top surface, and the embedded steel plate is located between the steel section and the UHPC plate. Shear nails can be set on the upper part of the embedded steel plate for connecting the embedded steel plate with the UHPC plate.

[0008] In the utility model, the transverse bridge cast-in-place joint can be a T-shaped structure, and when the concrete is cast-in-place, UHPC can be cast-in-place.

[0009] In the joint connection structure of the above-mentioned steel-UHPC composite bridge deck, preferably, the web of the steel section is provided with an overhanging section extending into the transverse bridge cast-in-place joint, and the spacing between adjacent ends of the overhanging sections in adjacent steel-UHPC composite bridge decks is 10-20 mm. The adjacent overhanging sections are symmetrically arranged.

[0010] In the joint connection structure of the above-mentioned steel-UHPC composite bridge deck, preferably, a second through hole is opened on the extension section, and the second through holes on the adjacent extension sections in the transverse direction of the bridge are arranged one by one, and transverse steel bars are arranged in the one-to-one corresponding second through holes. More preferably, the second through holes are circular holes with a diameter of 15-30 mm. The transverse steel bars are inserted into the second through holes to form a PBL bond with strong shear resistance with the UHPC cast in the closed chamber, so that the integrity of the steel-UHPC is stronger, which is conducive to improving the mechanical properties of the joint.

[0011] In the joint connection structure of the above-mentioned steel-UHPC composite bridge deck, preferably, the steel is provided with an end sealing steel plate at one end close to the transverse bridge direction cast-in-place joint, the end sealing steel plates at the ends of the steel adjacent to the transverse bridge direction are connected to close the side of the transverse bridge direction cast-in-place joint, and the end sealing steel plate is provided with a shear connector on one side close to the transverse bridge direction cast-in-place joint. Shear nails are welded at the interface between the end sealing steel plate and the closed chamber to connect the UHPC in the closed chamber. The thickness of the end sealing steel plate can be 8-12mm.

[0012] In the utility model, by extending the embedded steel plate into the transverse bridge cast-in-place joint, and providing shear connectors on the bottom and top surfaces of the embedded steel plate at the transverse bridge cast-in-place joint, the embedded steel plate has a larger cross-sectional area extending into the transverse bridge cast-in-place joint, and can be reliably connected to the cast-in-place concrete, which can improve the tensile performance of the joint part, and the tensile and anchoring performance of the transverse bridge cast-in-place joint is better, meeting the mechanical performance requirements of the joint. In a more preferred scheme, by extending the steel web into the transverse bridge cast-in-place joint, and then adding end sealing steel plates, the extended section, the end sealing steel plates and the embedded steel plates will form a structure similar to the steel grid, and the three of them work together to increase the contact area between the steel structure and the UHPC, so that the internal force transmission of the steel-UHPC composite bridge deck at the joint is smoother, the integrity is better, and the mechanical properties of the joint are more excellent. In order to achieve the above effect, the extended section, the end sealing steel plate and the embedded steel plate are indispensable.

[0013] In the joint connection structure of the above-mentioned steel-UHPC composite bridge deck, preferably, the embedded steel plate is provided with a first through hole at one end of the transverse bridge cast-in-place joint, and the first through hole is a circular hole with a diameter of 50-150 mm. A plurality of first through holes are provided to cast the cast-in-place UHPC in the closed chamber, and to maintain the integrity of the cast-in-place UHPC inside and outside the closed chamber, thereby improving the mechanical properties of the joint. That is, the provision of the first through hole can facilitate the casting of the UHPC, while allowing the UHPC at the upper and lower joints of the embedded steel plate to penetrate and form a whole, which is conducive to the overall connection of the joint.

[0014] In the joint connection structure of the above-mentioned steel-UHPC composite bridge deck, preferably, the adjacent ends of the embedded steel plates in the adjacent steel-UHPC composite bridge decks are fixedly connected in the transverse bridge cast-in-place joint. In the utility model, the adjacent ends of the embedded steel plates can be fixedly connected in the transverse bridge cast-in-place joint by welding. In this way, the performance of the joint will be more excellent. For the case where the mechanical performance requirements are not high, the embedded steel plates may not be welded, and the two can be arranged adjacent to each other, and the distance between the two is controlled to be no more than 10 mm, so as to ensure that a structure similar to the steel format can be formed at the joint to ensure the mechanical properties of the joint.

[0015] In the joint connection structure of the above-mentioned steel-UHPC composite bridge deck, preferably, the UHPC board is stepped at one end near the transverse bridge cast-in-place joint, and the end of the UHPC board is flush with the end of the steel. By setting the stepped end, the UHPC completely covers the steel below, and the rigidity of both ends of the steel-UHPC composite bridge deck is relatively strong, which is easier to hoist and position.

[0016] In the joint connection structure of the above-mentioned steel-UHPC composite bridge deck, preferably, the distance that the embedded steel plate extends between the steel and the UHPC plate is 30-100 cm, and the embedded steel plate extending between the steel and the UHPC plate is provided with a third through hole (which may be a circular hole with a diameter of 20-40 mm) for the shear connector (such as shear nail) on the steel to pass through and extend into the UHPC plate, and the third through hole may be arranged in 2 rows. Shear nails are welded on the steel to connect the steel and the UHPC panel, and a third through hole is provided for the shear nail to pass through.

[0017] In the joint connection structure of the above-mentioned steel-UHPC composite bridge deck, preferably, the adjacent steel-UHPC composite bridge decks are arranged on the upper flange plate of a steel beam, and the longitudinal bridge length of the steel-UHPC composite bridge deck overlapped on the upper flange plate is 20-50mm; a shear connector is provided on the upper flange plate; a rubber plate is provided between the steel-UHPC composite bridge deck and the upper flange plate. A shear connector is welded on the upper flange plate for connecting with the cast-in-place UHPC in the closed chamber.

[0018] The utility model also provides a construction method for the joint connection structure of the above-mentioned steel-UHPC composite bridge deck, comprising the following steps:

[0019] S1: prefabricate the steel-UHPC composite bridge deck in a factory, and simultaneously install the embedded steel plates and the shear connectors on the embedded steel plates during prefabrication;

[0020] S2: hoist a pair of the steel-UHPC composite bridge panels onto the upper flange plate of the steel beam, and then cast UHPC between the adjacent steel-UHPC composite bridge panels to make the cast-in-place UHPC flush with the surface of the UHPC plate, and perform maintenance to complete the construction.

[0021] More specifically, the construction method may include the following steps: prefabricating steel-UHPC composite bridge deck in the factory (including prefabrication of embedded steel plates, end sealing steel plates, and extension sections) - welding shear nails on the upper flange plate of the steel beam - installing rubber plates - installing prefabricated steel-UHPC composite bridge deck - inserting transverse steel bars into the second through hole - casting cast-in-place UHPC inside and outside the closed chamber through the first through hole - curing to the design strength.

[0022] The utility model discloses a joint connection structure of a steel-UHPC composite bridge deck, comprising a steel crossbeam with an upper flange plate, a prefabricated steel-UHPC composite bridge deck composed of a steel section and a prefabricated UHPC plate placed on the steel crossbeam, a steel web with a hole extending outward (i.e., an extending section), an embedded steel plate embedded in the top surface of the steel section and the bottom surface of the UHPC plate, an end sealing steel plate connecting the steel sections with the steel sections in the transverse direction of the bridge, and a closed chamber (a steel-like grid structure) composed of the embedded steel plate, the end sealing steel plate and the steel crossbeam. When casting UHPC in situ, UHPC is cast into the grid through the first through hole, and then cast on the top surface of the embedded steel plate until it is flush with the top surface of the UHPC bridge deck.

[0023] Compared with the prior art, the advantages of the utility model are:

[0024] 1. The joint connection structure of the steel-UHPC composite bridge deck of the utility model is that the embedded steel plate in the steel-UHPC composite bridge deck extends into the cast-in-place joint in the transverse direction, and shear connectors are arranged on the bottom and top surfaces of the embedded steel plate at the transverse direction cast-in-place joint. The embedded steel plate has a large cross-sectional area extending into the transverse direction cast-in-place joint, which can be reliably connected with the cast-in-place concrete, and the tensile performance of the joint part can be improved. The tensile and anchoring performance of the transverse direction cast-in-place joint is better, and the mechanical performance requirements of the joint are met.

[0025] 2. The joint connection structure of the steel-UHPC composite bridge deck of the utility model does not require a complex end structure and is easy to process. In the subsequent construction, the on-site construction is simple and there is no need to set up formwork. After installation, only the joint UHPC needs to be poured and maintained to form. In addition, in the subsequent construction, welding is basically not required, which avoids a significant decrease in the fatigue resistance of the structure caused by welding.

[0026] In general, the joint connection structure of the steel-UHPC composite bridge deck of the utility model has the advantages of reliable joint connection, strong structural connection performance, simple prefabrication construction and on-site construction, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic structural diagram of the joint connection structure of the medium-sized steel-UHPC composite bridge deck in the embodiment.

[0029] Figure 2It is a schematic diagram of the structure of the joint connection structure of the steel-UHPC composite bridge deck after being disassembled in the embodiment.

[0030] Legend

[0031] 1. Steel section; 2. UHPC board; 3. Cast-in-place joint in transverse direction; 4. Embedded steel plate; 5. First through hole; 6. Shear connector; 7. Extended section; 8. Second through hole; 9. Transverse reinforcement; 10. End sealing steel plate; 11. Steel beam; 12. Rubber sheet. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and carefully below in conjunction with the accompanying drawings and preferred embodiments of the specification, but the protection scope of the present invention is not limited to the following specific embodiments.

[0033] It should be noted that when an element is described as being "fixed, fixed, connected or connected to" another element, it can be directly fixed, fixed, connected or connected to the other element, or it can be indirectly fixed, fixed, connected or connected to the other element through other intermediate connectors.

[0034] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present utility model.

[0035] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0036] Example:

[0037] like Figure 1 and Figure 2As shown, the joint connection structure of the steel-UHPC composite bridge deck of this embodiment, the steel-UHPC composite bridge deck includes a steel 1 and a UHPC plate 2 arranged on the steel 1, the joint connection structure includes a pair of steel-UHPC composite bridge decks arranged adjacent to each other in the longitudinal direction and a cast-in-place joint 3 in the transverse direction (cast-in-place UHPC in this embodiment) cast between adjacent steel-UHPC composite bridge decks, and the steel-UHPC composite bridge deck is provided with a cast-in-place joint 3 at one end near the cast-in-place joint 3 in the transverse direction. An embedded steel plate 4, one end of the embedded steel plate 4 extends between the steel section 1 and the UHPC plate 2, the other end of the embedded steel plate 4 extends into the cross-bridge cast-in-place joint 3, a first through hole 5 (such as a circular hole with a diameter of 50-150 mm) is opened on one end of the embedded steel plate 4 located in the cross-bridge cast-in-place joint 3, a shear connector 6 (which may be a cylindrical head weld nail) is provided on the upper surface of the embedded steel plate 4, and a shear connector 6 (which may be a cylindrical head weld nail) is provided on the lower surface of the embedded steel plate 4 at one end of the cross-bridge cast-in-place joint 3.

[0038] In this embodiment, an overhanging section 7 is provided in the cast-in-place joint 3 extending from the web of the steel section 1 in the transverse direction of the bridge, and the spacing between adjacent ends of the overhanging section 7 in adjacent steel section-UHPC composite bridge decks is 10-20 mm (the above range is acceptable, such as 10 mm).

[0039] In this embodiment, a second through hole 8 (which may be a circular hole with a diameter of 15-30 mm) is opened on the extension section 7, and the second through holes 8 on the adjacent extension sections 7 in the transverse bridge direction are arranged one by one, and transverse steel bars 9 are provided in the one-to-one corresponding second through holes 8.

[0040] In this embodiment, an end sealing steel plate 10 is provided at one end of the steel section 1 close to the cast-in-place joint 3 in the transverse bridge direction, and the end sealing steel plates 10 at the ends of adjacent steel sections 1 in the transverse bridge direction are connected to close the side of the cast-in-place joint 3 in the transverse bridge direction. A shear connector 6 (which may be a cylindrical head weld nail) is provided on the side of the end sealing steel plate 10 close to the cast-in-place joint 3 in the transverse bridge direction.

[0041] In this embodiment, the adjacent ends of the embedded steel plates 4 in the adjacent steel-UHPC composite bridge decks are in contact in the transverse bridge cast-in-place joints 3, for example, fixedly connected by welding. Of course, in other embodiments, the adjacent ends of the embedded steel plates 4 may not be fixedly connected, but generally the spacing between them is ensured to be less than 10 mm to ensure performance requirements.

[0042] In this embodiment, the end of the UHPC plate 2 close to the transverse cast-in-place joint 3 is stepped, and the end of the UHPC plate 2 is flush with the end of the steel section 1 .

[0043] In this embodiment, the embedded steel plate 4 extends between the steel section 1 and the UHPC plate 2 by a distance of 30-100 cm (any of the above ranges, such as 50 cm), and the embedded steel plate 4 extending between the steel section 1 and the UHPC plate 2 is provided with a third through hole for the shear connector 6 on the steel section 1 to pass through and extend into the UHPC plate 2.

[0044] In this embodiment, adjacent steel-UHPC composite bridge decks are arranged on the upper flange plate of a steel beam 11, and the longitudinal bridge length of the steel-UHPC composite bridge deck overlapped on the upper flange plate is 20-50 mm (the above range is all possible, such as 30 mm); a shear connector 6 (which can be a cylindrical head weld) is provided on the upper flange plate; a rubber plate 12 is provided between the steel-UHPC composite bridge deck and the upper flange plate.

[0045] The construction method of the joint connection structure of the steel-UHPC composite bridge deck of this embodiment includes the following steps:

[0046] S1: Prefabricate the steel-UHPC composite bridge deck in the factory, and simultaneously install the embedded steel plate 4 and the shear connector 6 on the embedded steel plate 4 during prefabrication;

[0047] S2: A pair of steel-UHPC composite bridge decks are hoisted onto the upper flange plate of the steel beam 11, and then UHPC is cast between adjacent steel-UHPC composite bridge decks to make the cast-in-place UHPC flush with the surface of the UHPC plate 2, and then cured to complete the construction.

[0048] More specifically, the construction method of the joint connection structure of the steel-UHPC composite bridge deck of the present embodiment may include the following steps: prefabricating the steel-UHPC composite bridge deck in the factory (including prefabrication of the embedded steel plate 4, the end sealing steel plate 10, and the extension section 7) - welding shear nails on the upper flange plate of the steel beam 11 - installing the rubber sheet 12 - installing the prefabricated steel-UHPC composite bridge deck - inserting the transverse steel bars 9 - pouring the cast-in-place UHPC inside and outside the closed chamber - curing to the design strength.

[0049] The joint connection structure of the steel-UHPC composite bridge deck of this embodiment has the advantages of reliable joint connection, strong structural connection performance, simple prefabrication construction and on-site construction, and has broad application prospects.

[0050] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A joint connection structure of a steel-UHPC composite bridge deck, the steel-UHPC composite bridge deck comprising a steel (1) and a UHPC plate (2) arranged on the steel (1), the joint connection structure comprising a pair of steel-UHPC composite bridge decks arranged adjacent to each other in the longitudinal direction and a cast-in-place joint (3) cast in the transverse direction between adjacent steel-UHPC composite bridge decks, characterized in that: In the steel-UHPC composite bridge deck, an embedded steel plate (4) is provided at one end close to the transverse bridge cast-in-place joint (3), one end of the embedded steel plate (4) extends between the steel (1) and the UHPC plate (2), and the other end of the embedded steel plate (4) extends into the transverse bridge cast-in-place joint (3), a shear connector (6) is provided on the upper surface of the embedded steel plate (4), and a shear connector (6) is provided on the lower surface of the embedded steel plate (4) at one end of the transverse bridge cast-in-place joint (3).

2. The joint connection structure according to claim 1, characterized in that: The web of the steel section (1) is provided with an overhanging section (7) extending into the transverse bridge cast-in-place joint (3), and the spacing between adjacent ends of the overhanging sections (7) in adjacent steel section-UHPC composite bridge decks is 10-20 mm.

3. The joint connection structure according to claim 2, characterized in that: The extended section (7) is provided with a second through hole (8), and the second through holes (8) on the adjacent extended sections (7) are arranged in a one-to-one correspondence in a transverse direction, and transverse steel bars (9) are arranged in the one-to-one corresponding second through holes (8).

4. The joint connection structure according to claim 1, characterized in that: The steel section (1) is provided with an end sealing steel plate (10) at one end close to the transverse bridge cast-in-place joint (3); the end sealing steel plates (10) at the ends of the steel sections (1) adjacent to the transverse bridge are connected to close the side of the transverse bridge cast-in-place joint (3); and a shear connector (6) is provided on the side of the end sealing steel plate (10) close to the transverse bridge cast-in-place joint (3).

5. The joint connection structure according to claim 1, characterized in that: The embedded steel plate (4) is provided with a first through hole (5) at one end of the transverse bridge cast-in-place joint (3), and the first through hole (5) is a circular hole with a diameter of 50-150 mm.

6. The joint connection structure according to any one of claims 1 to 5, characterized in that: Adjacent ends of the embedded steel plates (4) in adjacent steel-UHPC composite bridge decks are fixedly connected in a transverse bridge cast-in-place joint (3).

7. The joint connection structure according to any one of claims 1 to 5, characterized in that: The UHPC plate (2) is stepped at one end close to the transverse cast-in-place joint (3), and the end of the UHPC plate (2) is flush with the end of the steel section (1).

8. The joint connection structure according to any one of claims 1 to 5, characterized in that: The embedded steel plate (4) extends between the steel section (1) and the UHPC plate (2) by a distance of 30-100 cm, and the embedded steel plate (4) extending between the steel section (1) and the UHPC plate (2) is provided with a third through hole for the shear connector (6) on the steel section (1) to pass through and extend into the UHPC plate (2).

9. The joint connection structure according to any one of claims 1 to 5, characterized in that: The adjacent steel-UHPC composite bridge decks are arranged on the upper flange plate of a steel beam (11), and the longitudinal bridge length of the steel-UHPC composite bridge deck overlapped on the upper flange plate is 20-50 mm; a shear connector (6) is provided on the upper flange plate; and a rubber plate (12) is provided between the steel-UHPC composite bridge deck and the upper flange plate.

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