A connection structure and construction method of steel bridge deck concrete anti-collision guardrail

Abstract

The present invention specifically relates to a connection structure of a concrete anti-collision guardrail on a steel bridge deck, including a concrete anti-collision guardrail, wherein anti-collision guardrail steel bars are arranged inside the concrete anti-collision guardrail, and the steel bridge deck is provided with a longitudinal perforated plate along the length direction of the guardrail, wherein the longitudinal perforated plate is vertically welded to the steel bridge deck, and the concrete anti-collision guardrail and the steel beam are connected as a whole by welding the anti-collision guardrail steel bars and the longitudinal perforated plate connecting pieces. The concrete anti-collision guardrail of the present invention is arranged on both sides of the steel bridge deck, and the concrete anti-collision guardrail and the steel bridge deck are connected as a whole by welding the anti-collision guardrail steel bars and the two longitudinal perforated plate connecting pieces, which can not only improve the connection performance of the concrete anti-collision guardrail and the steel bridge deck, but also avoid a large number of transverse discontinuous welds between the anti-collision guardrail steel bars and the steel bridge deck, thereby improving the fatigue strength and service life of the steel bridge deck.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a connection structure of a steel bridge deck concrete anti-collision guardrail and a construction method thereof. Background Art

[0002] The steel bridge deck is composed of a top plate and longitudinal and transverse stiffening ribs welded to the top plate, with a waterproof layer and an asphalt pavement layer on the top plate. It has the advantages of light weight, large bearing capacity, and wide application range, and is the most commonly used structural form in steel structure bridges.

[0003] In order to ensure the safety of vehicle traffic, it is necessary to install anti-collision guardrails on both sides of the bridge. Anti-collision guardrails are mainly rigid guardrails represented by concrete guardrails and semi-rigid guardrails represented by steel structure beam-column guardrails. Generally speaking, concrete bridges mainly use concrete anti-collision guardrails, and steel structure bridges mainly use steel structure beam-column anti-collision guardrails. In order to control the cost of urban elevated bridges, most standard span bridges use concrete structures, and some large span bridges use steel structures. In order to maintain a consistent shape, the anti-collision guardrails of steel structure bridges often use the same concrete anti-collision guardrails as adjacent concrete bridges.

[0004] The traditional method of connecting the concrete anti-collision guardrail to the steel bridge deck is to directly weld the stress-bearing steel bars in the anti-collision guardrail to the steel bridge deck, and then pour concrete to achieve the connection between the concrete anti-collision guardrail and the steel bridge deck. This method results in a large number of transverse discontinuous welds on the steel bridge deck, which reduces the fatigue strength and service life of the steel structure. Therefore, it is necessary to optimize the connection structure between the concrete anti-collision guardrail and the steel bridge deck to further improve the fatigue strength and service life of the steel bridge deck. Summary of the invention

[0005] The purpose of the present invention is to propose a connection structure of a steel bridge deck concrete anti-collision guardrail, which overcomes the shortcomings of the above-mentioned traditional steel bridge deck concrete anti-collision guardrail connection and improves the fatigue strength and service life of the steel bridge deck.

[0006] The implementation of the present invention is completed by the following technical solutions: a connection structure of a steel bridge deck concrete anti-collision guardrail, including a concrete anti-collision guardrail, wherein the concrete anti-collision guardrail is provided with anti-collision guardrail steel bars, and is characterized in that a longitudinal perforated plate is provided on the steel bridge deck along the length direction of the guardrail, and the longitudinal perforated plate is vertically welded to the steel bridge deck, and the concrete anti-collision guardrail and the steel beam are connected as one by welding the anti-collision guardrail steel bars and the longitudinal perforated plate connecting piece.

[0007] Furthermore, the concrete anti-collision guardrail includes a guardrail body, the bottom of the guardrail body protrudes inward to form a base slope, and a first anti-collision guardrail steel bar arranged along the contour of the guardrail body and a second anti-collision guardrail steel bar arranged along the contour of the base slope are provided in the concrete anti-collision guardrail. Two parallel longitudinal perforated plates are provided on the steel bridge deck along the length direction of the guardrail, and both ends of the first steel bar of the anti-collision guardrail extend downward and extend upward after being bent. The end portions of the first steel bar of the anti-collision guardrail are welded to the two side surfaces of the outer longitudinal perforated plate, the upper end of the second steel bar of the anti-collision guardrail is welded to the first steel bar of the anti-collision guardrail, and the lower end of the second steel bar of the anti-collision guardrail is welded to the inner side surface of the inner longitudinal perforated plate.

[0008] Furthermore, the steel bridge deck is composed of an orthogonal special-shaped plate structure consisting of a top plate, longitudinal stiffening ribs and transverse stiffening ribs. A side sealing plate is provided on the outer side of the steel bridge deck. The lower side of the inner longitudinal perforated plate is aligned with the longitudinal stiffening ribs of the steel bridge deck, and the outer longitudinal perforated plate is aligned with the side sealing plate of the steel bridge deck.

[0009] Furthermore, the anti-collision guardrail is a reinforced concrete structure composed of concrete and anti-collision guardrail steel bars.

[0010] Furthermore, several groups of first steel bars and second steel bars of the concrete anti-collision guardrail are arranged along the length direction of the guardrail, and several circular holes are arranged at equal intervals in the longitudinal direction of the longitudinal perforated plate connecting piece, and the spacing between adjacent circular holes is the same as the spacing between the steel bars of the anti-collision guardrail, and the diameter of the circular holes is 0.4~0.5 of the spacing between the circular holes.

[0011] Another object of the present invention is to provide a construction method for a steel bridge deck concrete anti-collision guardrail, which can improve the fatigue strength and service life of the steel bridge deck.

[0012] In order to achieve the above object, the technical solution of the present invention is as follows: a construction method of a steel bridge deck concrete anti-collision guardrail, characterized in that the construction method comprises the following steps:

[0013] A. Weld the first steel bar of the anti-collision guardrail and the second steel bar of the anti-collision guardrail into a frame, wherein the first steel bar of the anti-collision guardrail is arranged along the contour of the guardrail body, and the second steel bar of the anti-collision guardrail is arranged along the base slope inside the bottom of the guardrail body;

[0014] B. Two longitudinal perforated plates parallel to each other are arranged on the steel bridge deck along the length direction of the guardrail, and the two longitudinal perforated plates are vertically welded to the top plate of the steel bridge deck;

[0015] C. Both ends of the first steel bar of the anti-collision guardrail extend downward and bend and then extend upward, and the two ends are respectively located on both sides of the outer longitudinal perforated plate, and the ends of the two ends are respectively welded to the two side surfaces of the outer longitudinal perforated plate; the lower end of the second steel bar of the anti-collision guardrail extends to the inner side of the inner longitudinal perforated plate and is welded to the inner side surface of the inner longitudinal perforated plate;

[0016] D. Several groups of first steel bars and second steel bars of anti-collision guardrails are arranged along the length direction of the guardrail;

[0017] E. Cast concrete anti-collision guardrail.

[0018] Furthermore, the steel bridge deck is composed of an orthogonal special-shaped plate structure consisting of a top plate, longitudinal stiffening ribs and transverse stiffening ribs. A side sealing plate is provided on the outer side of the steel bridge deck. The lower side of the inner longitudinal perforated plate is aligned with the longitudinal stiffening ribs of the steel bridge deck, and the outer longitudinal perforated plate is aligned with the side sealing plate of the steel bridge deck.

[0019] The advantages of the present invention are: 1. Avoiding the direct welding of concrete anti-collision guardrail steel bars with steel bridge decks to produce a large number of transverse discontinuous welds, which leads to a reduction in the fatigue strength and service life of the steel bridge decks; 2. Not only improving the connection performance of the concrete anti-collision guardrail and the steel beam, but also improving the fatigue strength and service life of the steel bridge decks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the connection between the concrete anti-collision guardrail and the steel bridge deck in the present invention.

[0021] Figure 2 For the present invention Figure 1 AA section view (welding sample of outer longitudinal perforated plate and anti-collision guardrail steel bars).

[0022] Figure 3 For the present invention Figure 1 BB section drawing (detail of welding inner longitudinal perforated plate and anti-collision guardrail steel bars).

[0023] Figure 4 Schematic diagram of the connection between traditional concrete crash barrier and steel bridge deck. DETAILED DESCRIPTION

[0024] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

[0025] like Figure 1-Figure 4 , marks 1-11 in the figure are: 1 - steel bridge deck top plate, 2 - longitudinal stiffening ribs, 3 - transverse stiffening ribs, 4 - side sealing plates, 5 - concrete anti-collision guardrail, 6 - first steel bar of anti-collision guardrail, 7 - second steel bar of anti-collision guardrail, 8 - outer longitudinal perforated plate, 9 - inner longitudinal perforated plate.

[0026] Example: Figure 1As shown, this embodiment provides a steel bridge deck concrete anti-collision guardrail and its connection structure. The steel bridge deck is composed of a steel bridge deck top plate 1, longitudinal stiffening ribs 2, transverse stiffening ribs 3, and side sealing plates 4. Several groups of first anti-collision guardrail steel bars 6 and second anti-collision guardrail steel bars 7 are arranged in the concrete anti-collision guardrail 5 along the length direction of the guardrail, and the first anti-collision guardrail steel bars 6 and the second anti-collision guardrail steel bars 7 form a concrete steel bar skeleton, wherein the first anti-collision guardrail steel bars 6 are arranged along the contour of the guardrail body, and the second anti-collision guardrail steel bars 7 are arranged along the base slope contour at the bottom of the guardrail body. Two mutually parallel longitudinal perforated plate connectors are arranged on the top surface of the steel bridge deck top plate 1, which are the outer longitudinal perforated plate 8 and the inner longitudinal perforated plate 9, respectively. The spacing between the outer longitudinal perforated plate 8 and the inner longitudinal perforated plate 9 is determined by the position of the first anti-collision guardrail steel bars 6 and the second anti-collision guardrail steel bars 7, ensuring that the first anti-collision guardrail steel bars 6 and the second anti-collision guardrail steel bars 7 can be welded with the outer longitudinal perforated plate 8 and the inner longitudinal perforated plate 9. The outer longitudinal perforated plate 8 and the inner longitudinal perforated plate 9 are vertically welded to the steel bridge deck top plate 1, and their lower parts are aligned with the longitudinal stiffening ribs 2 of the steel bridge deck.

[0027] like Figure 2 As shown, the first steel bar 6 of the anti-collision guardrail extends downward at both ends and then extends upward after being bent. Its two ends are respectively welded to the two sides of the outer longitudinal perforated plate 8, and are arranged at equal intervals with the circular holes, and are welded by double-sided welding. Figure 3 As shown, one end of the second steel bar 7 of the anti-collision guardrail is welded to the first steel bar 6 of the anti-collision guardrail, and the other end is welded to the inner side surface of the inner longitudinal perforated plate 9, and is arranged at equal intervals with the circular hole, using double-sided welding.

[0028] The traditional way of connecting concrete anti-collision guardrail with steel bridge deck is as follows Figure 4 As shown, the first steel bar 6 and the second steel bar 7 of the anti-collision guardrail are welded into a skeleton and then directly welded to the steel bridge deck top plate 1 and the side cover plate 4, and then the concrete anti-collision guardrail 5 is poured. This method will cause a double-sided fillet weld to be generated at a certain interval (generally 150mm) along the bridge direction on the steel bridge deck top plate 1 and the side cover plate 4 that are in contact with the concrete anti-collision guardrail. A large number of transverse intermittent welds not only cause welding deformation of the steel bridge deck, but also reduce the fatigue strength and service life of the steel bridge deck.

[0029] The present invention completely overcomes the above disadvantages, and two longitudinal perforated plates are arranged on the steel bridge deck top plate 1. All anti-collision guardrail steel bars are welded on the longitudinal perforated plates, avoiding direct connection between the steel bars and the main structure, and avoiding damage to the main structure caused by welding.

[0030] At the same time, the longitudinal perforated plate itself is provided with circular holes, which can enhance the connection performance with concrete and ensure the connection performance between the concrete anti-collision guardrail 5 and the steel bridge deck 1. Furthermore, the diameter of the circular hole is 0.4-0.5 of the circular hole spacing. In a specific embodiment, the circular hole diameter is 70 mm, and the spacing between the circular holes is 150 mm.

[0031] The steel bridge deck concrete anti-collision guardrail and the connection structure thereof of the present invention not only improve the connection performance between the concrete anti-collision guardrail and the steel beam, but also improve the fatigue strength and service life of the steel bridge deck.

Claims

1. A connection structure of a steel bridge deck concrete anti-collision guardrail, comprising a concrete anti-collision guardrail, wherein the concrete anti-collision guardrail is provided with anti-collision guardrail steel bars, characterized in that A longitudinal perforated plate is provided on the steel bridge deck along the length direction of the guardrail, and the longitudinal perforated plate is vertically welded on the steel bridge deck. The concrete anti-collision guardrail and the steel beam are connected as a whole by welding the anti-collision guardrail steel bars and the longitudinal perforated plate connecting pieces; the concrete anti-collision guardrail includes a guardrail body, the bottom of the guardrail body protrudes inward to form a base slope, and the concrete anti-collision guardrail is provided with a first anti-collision guardrail steel bar arranged along the contour of the guardrail body and a second anti-collision guardrail steel bar arranged along the contour of the base slope; two longitudinal perforated plates parallel to each other are provided on the steel bridge deck along the length direction of the guardrail, and both ends of the first anti-collision guardrail steel bar extend downward and extend upward after being bent, and both end ends of the first anti-collision guardrail steel bar are welded to the two side surfaces of the outer longitudinal perforated plate, the upper end of the second anti-collision guardrail steel bar is welded to the first anti-collision guardrail steel bar, and the lower end of the second anti-collision guardrail steel bar is welded to the inner side surface of the inner longitudinal perforated plate.

2. The connection structure of the steel bridge deck concrete anti-collision guardrail according to claim 1 is characterized in that The steel bridge deck is composed of an orthogonal special-shaped plate structure consisting of a top plate, longitudinal stiffening ribs and transverse stiffening ribs. A side sealing plate is arranged on the outer side of the steel bridge deck. The lower side of the inner longitudinal perforated plate is aligned with the longitudinal stiffening ribs of the steel bridge deck, and the outer longitudinal perforated plate is aligned with the side sealing plate of the steel bridge deck.

3. The connection structure of the steel bridge deck concrete anti-collision guardrail according to claim 1 is characterized in that The longitudinal perforated plate connector is provided with a plurality of circular holes at equal longitudinal intervals, the interval between adjacent circular holes is the same as the interval between steel bars of the anti-collision guardrail, and the aperture of the circular holes is 0.4 to 0.5 of the interval between the circular holes.

4. A construction method for a steel bridge deck concrete anti-collision guardrail, characterized in that The construction method comprises the following steps: A. Weld the first steel bar of the anti-collision guardrail and the second steel bar of the anti-collision guardrail into a frame, wherein the first steel bar of the anti-collision guardrail is arranged along the contour of the guardrail body, and the second steel bar of the anti-collision guardrail is arranged along the base slope inside the bottom of the guardrail body; B. Two longitudinal perforated plates parallel to each other are arranged on the steel bridge deck along the length direction of the guardrail, and the two longitudinal perforated plates are vertically welded to the top plate of the steel bridge deck; C. Both ends of the first steel bar of the anti-collision guardrail extend downward and bend and then extend upward, and the two ends are respectively located on both sides of the outer longitudinal perforated plate, and the ends of the two ends are respectively welded to the two side surfaces of the outer longitudinal perforated plate; the lower end of the second steel bar of the anti-collision guardrail extends to the inner side of the inner longitudinal perforated plate and is welded to the inner side surface of the inner longitudinal perforated plate; D. Several groups of first steel bars and second steel bars of anti-collision guardrails are arranged along the length direction of the guardrail; E. Cast concrete anti-collision guardrail; The steel bridge deck is composed of an orthogonal special-shaped plate structure consisting of a top plate, longitudinal stiffening ribs and transverse stiffening ribs. A side sealing plate is arranged on the outer side of the steel bridge deck. The lower side of the inner longitudinal perforated plate is aligned with the longitudinal stiffening ribs of the steel bridge deck, and the outer longitudinal perforated plate is aligned with the side sealing plate of the steel bridge deck.

5. The construction method of a steel bridge deck concrete anti-collision guardrail according to claim 4 is characterized in that The steel bridge deck is composed of an orthogonal special-shaped plate structure consisting of a top plate, longitudinal stiffening ribs and transverse stiffening ribs. A side sealing plate is arranged on the outer side of the steel bridge deck. The lower side of the inner longitudinal perforated plate is aligned with the longitudinal stiffening ribs of the steel bridge deck, and the outer longitudinal perforated plate is aligned with the side sealing plate of the steel bridge deck.

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