CN-115162159-B - Steel-concrete combined bridge deck adopting inverted U-shaped shearing-resistant connecting piece and construction method

Abstract

The invention belongs to the technical field of bridge structures, and particularly relates to a steel-concrete combined bridge deck adopting an inverted U-shaped shear connector and a construction method. According to the invention, the bridge deck concrete layer is formed by pouring the bottom steel plate, the inverted U-shaped perforated steel plate unit is arranged on the bottom steel plate, and the reinforcing mesh is arranged on the inverted U-shaped perforated steel plate unit, so that the shearing resistance bearing capacity of the steel-concrete combined bridge deck is further improved. In addition, the invention also provides a construction method of the combined bridge deck slab, which can relatively simply and efficiently finish the whole construction process of the combined bridge deck slab by fixing the bottom steel plate, welding the inverted U-shaped perforated steel plate unit, then welding the reinforcing steel bar net and finally pouring to form the bridge deck concrete layer.

Inventors

• WU QINGXIONG
• CHEN KANGMING
• YANG YILUN
• CHEN ZHIWEI
• SUN ZUOXUAN

Assignees

• 福州大学
• 福建省高速公路科技创新研究院有限公司

Dates

Publication Date

20260508

Application Date

20220624

Claims (5)

1. 1. The steel-concrete combined bridge deck adopting the inverted U-shaped shearing-resistant connecting piece is characterized by comprising a bottom steel plate (a) and a bridge deck concrete layer (b), wherein an inverted U-shaped perforated steel plate unit (1) is arranged on the upper surface of the bottom steel plate (a), a reinforcing mesh (2) is arranged at the upper end of the inverted U-shaped perforated steel plate unit (1), The inverted U-shaped perforated steel plate unit (1) comprises two inverted U-shaped steel plates (101) with the long sides bent downwards, top perforated holes (102) which are arranged on the axial center line of the long sides of the inverted U-shaped steel plates (101) and are used for forming concrete shear bolts, and two rows of side perforated holes (103) which are respectively arranged at the two sides of the top perforated holes (102) and are used for forming the concrete shear bolts, The top opening (102) and the side opening (103) are both elliptical in shape, the long axial direction of the ellipse is the long side direction of the inverted U-shaped steel plate (101), The short axis length of the side opening (103) is larger than 1/2 of the height of the inverted U-shaped opening steel plate unit (1), the short axis length of the top opening (102) is larger than 1/2 of the width of the inverted U-shaped opening steel plate unit (1), The inverted U-shaped steel plate (101) is also provided with a connecting frame body unit (3) for installing the reinforcing mesh (2), The connecting frame body unit (3) comprises a vertical rectangular plate (301), an arc-shaped groove (302) which is arranged on the bottom edge of the vertical rectangular plate (301) and used for being clamped into the inverted U-shaped steel plate (101), and a half-cut pipe (303) which is arranged on the upper surface of the vertical rectangular plate (301) and used for installing steel bars below the steel bar mesh (2).
2. 2. The steel-concrete combined bridge deck adopting the inverted U-shaped shearing resistant connecting piece as claimed in claim 1, wherein the length direction of the inverted U-shaped perforated steel plate unit (1) is the transverse direction of the bridge deck, and two long sides of the inverted U-shaped perforated steel plate unit (1) are all arranged on the upper surface of the bottom steel plate (a).
3. 3. The steel-concrete composite bridge deck employing inverted U-shaped shear connectors as recited in claim 1, wherein said connection frame unit (3) further comprises through holes (304) provided between said arc-shaped grooves (302) and vertical sides of the vertical rectangular plates (301), and plug posts (305) provided on both of said through holes (304) and passing through both of said side openings (103).
4. 4. The steel-concrete composite bridge deck using an inverted U-shaped shear connector as set forth in claim 3, wherein said connection frame unit (3) further comprises two fastening nuts (306) respectively provided at both ends of said plug-in post (305) and for clamping the vertical side surfaces of said vertical rectangular plate (301).
5. 5. The construction method of the steel-concrete composite bridge deck using the inverted U-shaped shear connector as claimed in claim 1, comprising the following steps in order: s1, fixing the bottom steel plate (a) on a bridge steel main beam; s2, welding two long edges of the inverted U-shaped perforated steel plate unit (1) on the upper surface of the bottom steel plate (a); s3, welding the reinforcing mesh (2) at the upper end of the inverted U-shaped perforated steel plate unit (1); S4, pouring bridge deck concrete on the bottom steel plate (a), pouring and tamping the bridge deck concrete inside and outside the inverted U-shaped perforated steel plate unit (1), covering and curing the bridge deck concrete until the bridge deck concrete reaches the design strength, and finally forming the complete bridge deck.

Description

Steel-concrete combined bridge deck adopting inverted U-shaped shearing-resistant connecting piece and construction method Technical Field The invention belongs to the technical field of bridge structures, and particularly relates to a steel-concrete combined bridge deck adopting an inverted U-shaped shear connector and a construction method. Background The bridge deck plate is taken as an important component of the bridge structure and directly bears the wheel pressure and impact of the upper vehicle, the working state of the bridge deck plate can directly influence the service performance of the bridge, the bridge deck plate structure is properly selected, and the bridge deck plate structure has great meaning in bridge design. The steel-concrete combined bridge deck is a novel bridge deck which is formed by combining a steel bottom plate and upper concrete through various shear connectors such as studs or perforated steel plate connectors (PBL) and the like into a whole and jointly stressed. Under the load effect, the composite material can fully exert the combined advantages of strong tensile property of steel and strong compressive property of concrete. At present, in the steel-concrete combined bridge deck structure, elastic connecting pieces such as densely distributed shear-resistant studs or rigid connecting pieces such as perforated steel Plates (PBLs) are generally adopted to be combined with the studs, and even longitudinal steel bars are penetrated into holes of the perforated steel plate connecting Pieces (PBLs) to be connected with the studs densely distributed in other areas, so that the whole shear-resistant bearing capacity of the steel-concrete combined bridge deck is improved. In the combined shear connector, the perforated steel plate has larger self slip resistance rigidity and large shear strength, can enhance the connection of the steel plate at the bottom of the bridge deck and the transverse rigidity of the bridge deck, is a novel steel-concrete combined bridge deck, is innovative and developed for the traditional reinforced steel-concrete combined deck, and is more suitable for being used as a bridge deck with large bearing load, complex bearing load and fatigue load bearing function. However, the bridge deck adopts a mode of densely distributing shear studs, so that the construction working face and the workload can be obviously increased, and the stud welding quality is influenced by a plurality of factors such as the welding skills of technicians and welding equipment. And the shearing-resistant connecting piece combining the perforated steel plate connecting Piece (PBL) and the pegs still needs to be matched with a large number of pegs to meet the shearing-resistant design requirement. The novel shear-resistant combined connecting piece of the perforated steel plate connecting Piece (PBL) +the bolt+the longitudinal steel bar is adopted, the longitudinal steel bar is firstly required to pass through the hole of the perforated steel plate, the shear-resistant section of the steel bar in the perforated section is very small, and the shear resistance of the steel bar+the bolt combination of the concrete and the bolt formed by the concrete section in the hole is very small compared with that of the bolt in the whole concrete section of the steel plate. Secondly, the rigid perforated steel plate connecting Piece (PBL) has high self-rigidity and small contact area with bridge deck concrete, and is extremely easy to crack at the interface between steel and concrete after bearing load. Finally, the novel combined shearing-resistant connecting piece with the perforated steel plate connecting Piece (PBL) +the bolt and the longitudinal steel bar still needs to be sheared together with the bolt to meet the shearing-resistant design requirement, the bridge deck structure is complex in structure, the construction operation surface is large, the steel consumption and the bridge deck dead weight are increased, the economical efficiency is low, the application of the novel combined shearing-resistant connecting piece in bridge decks with larger spans is limited, and the development direction of continuous durability, light weight and convenient construction of bridge deck systems of bridges is not met. Therefore, it is necessary to design a steel-concrete combined bridge deck structure with reasonable structural stress, lighter dead weight, excellent durability, convenient construction and strong economical practicability and a construction method thereof, and the problems of complex structure and construction, large working surface, multiple diseases, low durability and the like of the current steel-concrete combined bridge deck can be effectively solved. The utility model patent publication No. CN214328517U, publication day 2021.10.01, disclose a steel ingot milling type steel fiber concrete combined bridge deck plate U-shaped connection structure, the bridge deck plate surface is provided wit