Steel-concrete composite bridge deck slab using inverted U-shaped shear connectors and method for constructing same

Abstract

A steel-concrete composite bridge deck slab using inverted U-shaped shear connectors and a method for constructing the same. The steel-concrete composite bridge deck slab includes a bottom steel plate and a bridge deck concrete layer, wherein inverted U-shaped perforated steel plate units are arranged on an upper surface of the bottom steel plate, and bar-mat reinforcements are arranged at upper ends of the inverted U-shaped perforated steel plate units.

Claims

1. A steel-concrete composite bridge deck slab using inverted U-shaped shear connectors, comprising a bottom steel plate and a bridge deck concrete layer, wherein inverted U-shaped perforated steel plate units are arranged on an upper surface of the bottom steel plate, and bar-mat reinforcements are arranged at upper ends of the inverted U-shaped perforated steel plate units; and wherein the inverted U-shaped perforated steel plate unit comprises two inverted U-shaped steel plates with the long edges bending downwards, top openings formed in central axes in long edge directions of the inverted U-shaped steel plates, and configured for forming concrete shear studs, and two rows of lateral openings respectively formed in two sides of the top openings, and configured for forming concrete shear studs.

2. The steel-concrete composite bridge deck slab using inverted U-shaped shear connectors according to claim 1, wherein a length direction of each of the inverted U-shaped perforated steel plate units is a transverse bridge direction of the bridge deck slab, and two long edges of the inverted U-shaped perforated steel plate unit are arranged on the upper surface of the bottom steel plate.

3. The steel-concrete composite bridge deck slab using inverted U-shaped shear connectors according to claim 1, wherein the top openings and the lateral openings are elliptical, and a long axial direction of ellipse is a long edge direction of the inverted U-shaped steel plate.

4. The steel-concrete composite bridge deck slab using inverted U-shaped shear connectors according to claim 3, wherein a length of the short axis of each of the lateral openings is greater than ½ of a height of the inverted U-shaped perforated steel plate unit; and a length of the short axis of each of the top openings is greater than ½ of a width of the inverted U-shaped perforated steel plate unit.

5. The steel-concrete composite bridge deck slab using inverted U-shaped shear connectors according to claim 1, wherein the inverted U-shaped steel plate is further provided with a connecting frame unit for installing the bar-mat reinforcements.

6. The steel-concrete composite bridge deck slab using inverted U-shaped shear connectors according to claim 5, wherein the connecting frame unit comprises a vertical rectangular plate, an arc-shaped groove formed in a bottom edge of the vertical rectangular plate, and configured for clipping the inverted U-shaped steel plate, and a half-sectional tube arranged on an upper surface of the vertical rectangular plate, and configured for installing a reinforcing steel bar below the bar-mat reinforcement.

7. The steel-concrete composite bridge deck slab using inverted U-shaped shear connectors according to claim 6, wherein the connecting frame unit further comprises through holes formed between the arc-shaped groove and a vertical side surface of the vertical rectangular plate, and a splicing column formed in two of the through holes and penetrating through two of the lateral openings.

8. The steel-concrete composite bridge deck slab using inverted U-shaped shear connectors according to claim 7, wherein the connecting frame unit further comprises two fastening nuts respectively arranged at two ends of the splicing column, and configured for clamping the vertical side surface of the vertical rectangular plate.

9. A method for constructing the steel-concrete composite bridge deck slab using inverted U-shaped shear connectors according to claim 1, successively comprising the following steps: (S1) fixing the bottom plate on a main beam of bridge steel; (S2): welding the two long edges of the inverted U-shaped perforated steel plate units to the upper surface of the bottom steel plate; (S3): welding the bar-mat reinforcements to the upper ends of the inverted U-shaped perforated steel plate units; and (S4): pouring bridge deck concrete onto the bottom steel plate, pouring and ramming an interior and exterior of the inverted U-shaped perforated steel plate unit compactly, then covering the bottom steel plate and performing maintenance till a designed strength is reached so as to finally form an intact bridge deck slab.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic diagram of a sectional structure of the present disclosure in a longitudinal bridge direction.

(2) FIG. 2 is a structural schematic diagram of an inverted U-shaped perforated steel plate unit which is not bent.

(3) FIG. 3 is a schematic diagram of a position structure of a connecting frame unit in the present disclosure.

(4) FIG. 4 is a schematic diagram of a usage mode of a half-sectional tube in the present disclosure.

(5) FIG. 5 is a schematic diagram of a position structure of a splicing column in the present disclosure.

(6) FIG. 6 is a schematic diagram of a position structure of a fastening nut in the present disclosure.

(7) In the drawings, reference numerals are listed as follows:

(8) A—longitudinal bridge direction—; a—bottom steel plate; b—bridge deck concrete layer; 1—inverted U-shaped perforated steel plate unit; 2—bar-mat reinforcement; 101—inverted U-shaped steel plate; 102—top opening; 103—lateral opening; 3—connecting frame unit; 301—vertical rectangular plate; 302—arc-shaped groove; 303—half-sectional tube; 304—through hole; 305—splicing column; 306—fastening nut.

DESCRIPTION OF THE EMBODIMENTS

(9) The following is merely preferred embodiments of the present disclosure and is not limitation to the scope of the present disclosure.

(10) As shown in FIGS. 1-6, the steel-concrete composite bridge deck slab using inverted U-shaped shear connectors is adopted. The structure includes a bottom steel plate a and a bridge deck concrete layer b, wherein inverted U-shaped perforated steel plate units 1 are arranged on an upper surface of the bottom steel plate a, and bar-mat reinforcements 2 are arranged at upper ends of the inverted U-shaped perforated steel plate units 1.

(11) In the embodiment, arrangement and extension directions of several inverted U-shaped perforated steel plate units 1 are the longitudinal bridge direction of the bridge deck slab, i.e., driving direction, and the inverted U-shaped perforated steel plate unit 1 itself is a large shear connector.

(12) A length direction of each of the inverted U-shaped perforated steel plate units 1 is a transverse bridge direction of the bridge deck slab, and two long edges of the inverted U-shaped perforated steel plate unit 1 are arranged on the upper surface of the bottom steel plate a.

(13) In the embodiment, the inverted U-shaped perforated steel plate unit 1 is welded to the upper surface of the bottom steel plate a. In addition, common shear studs can further be arranged on the upper surface of the bottom steel plate a.

(14) The inverted U-shaped perforated steel plate unit 1 includes two inverted U-shaped steel plates 101 with the long edges bending downwards, top openings 102 formed in central axes in the long edge directions of the inverted U-shaped steel plates 101, and configured for forming concrete shear studs, and two rows of lateral openings 103 respectively formed in two sides of the top openings, and configured for forming concrete shear studs 102.

(15) In the embodiment, the inverted U-shaped steel plate 101 is formed by bending a rectangular straight steel plate in an inverted U-shaped pattern. In addition, the top openings 102 and the lateral openings 103 are formed during formation of the rectangular straight steel plate.

(16) The top openings 102 and the lateral openings 103 are elliptical, and a long axial direction of ellipse is a long edge direction of the inverted U-shaped steel plate 101.

(17) In the embodiment, the top openings 102 and the lateral openings 103 cannot be polygonal such as rectangular and triangular, because the inverted U-shaped steel plate 101 is easy to crack at the angle ends of the openings as stress at the angle ends of polygon will be too concentrated. In addition, the top openings and the lateral openings are preferably round holes, so that the above problem of stress concentration can be alleviated properly. However, with respect to the strip-type inverted U-shaped steel plate 101, if the round holes are too small, the formed concrete shear studs are not large enough with ordinary shear performance, and if the round holes are too large, an under-width region is easily formed at the inverted U-shaped steel plate 101, and the region is easy to break as well.

(18) Therefore, the top openings and the lateral openings are most preferably elliptical, which can alleviate the problem, that the lateral sides of the steel plate are too thin, brought by the round holes.

(19) The length of the short axis length of each of the lateral openings 103 is greater than ½ of the height of the inverted U-shaped perforated steel plate unit 1; and the length of the short axis length of each of the top openings 102 is greater than ½ of the width of the inverted U-shaped perforated steel plate unit 1.

(20) In the embodiment, the length of the short axis length of each of the lateral openings 103 and the length of the short axis length of each of the top openings 102 both are plane sizes of the steel plate which is not bent. The two elliptical holes are large to the greatest extent, so as to increase the dimensional specifications of the concrete shear studs formed at the lateral openings 103 and the top openings 102 to the greatest extent without obviously reducing the structural strength of the inverted U-shaped steel plate 101, thereby improving the shear performance of the whole composite bridge deck slab.

(21) The inverted U-shaped steel plate 101 is further provided with a connecting frame unit 3 for installing the bar-mat reinforcements 2.

(22) In the embodiment, there are at least the following two shortcomings in terms of using effect of the bar-mat reinforcements 2 if there is no connecting frame unit 3: I, there is a few region at the top of the inverted U-shaped steel plate 101 for welding the bar-mat reinforcements 2, so that the two are not firmly welded; and II, once the height of the inverted U-shaped steel plate 101 is fixed, the up-down heights of the bar-mat reinforcements 2 cannot be adjusted properly.

(23) Thus, the connecting frame unit 3 is arranged just to solve the above two problems.

(24) The connecting frame unit 3 includes a vertical rectangular plate 301, an arc-shaped groove 302 formed in a bottom edge of the vertical rectangular plate 301 to clip the inverted U-shaped steel plate 101, and a half-sectional tube 303 arranged on an upper surface of the vertical rectangular plate 301 to install a reinforcing steel bar below the bar-mat reinforcement 2.

(25) In the embodiment, use of the connecting frame unit 3 has a requirement on the bar-mat reinforcement 2, i.e., the reinforcing steel bars below the bar-mat reinforcement 2 have to be perpendicular to the length direction of the inverted U-shaped steel plate 101.

(26) Therefore, the arc-shaped groove 302 is welded to the upper surface of the inverted U-shaped steel plate 101, and the half-sectional tube 303 is welded to the reinforcing steel bars below the bar-mat reinforcement 2, guaranteeing that the two welds have welding faces large enough. Of course, at the beginning, the vertical rectangular plate 301 is integrally formed with the half-sectional tube 303 or has been firmly welded to the half-sectional tube.

(27) Finally, above the inverted U-shaped steel plate 101, each reinforcing steel bar below the bar-mat reinforcement 2 needs not to be connected by the connecting frame unit 3 as long as the fixing strength of the bar-mat reinforcement 2 meets the design requirement.

(28) The connecting frame unit 3 further includes through holes 304 formed between the arc-shaped groove 302 and a vertical side surface of the vertical rectangular plate 301, and a splicing column 305 formed in two of the through holes 304 and penetrating through two of the lateral openings 103.

(29) In the embodiment, the splicing column 305 penetrates through the first through hole 304, the first lateral opening 103, the second lateral opening 103 and the second through hole 304 in sequence, guaranteeing that besides the above welding position, there is a clamping and fixing action at the splicing column 305 between the vertical rectangular plate 301 and the inverted U-shaped steel plate 101. Therefore, it is finally guaranteed that the connecting frame unit 3 is installed firmly on the inverted U-shaped steel plate 101.

(30) Of course, it is to be noted that the splicing column 305 can neither be too thick nor reduce the dimensional specification of the concrete shear studs formed at the lateral openings 103.

(31) The connecting frame unit 3 further includes two fastening nuts 306 respectively arranged at two ends of the splicing column 305 to clamp the vertical side surface of the vertical rectangular plate 301.

(32) In the embodiment, threaded sections are further arranged at both ends of the splicing column 305 and are matched with the fastening nuts 306 to further fix the splicing column 305 firmly.

(33) A method for constructing the steel-concrete composite bridge deck slab using inverted U-shaped shear connectors successively includes the following steps: S1: fixing the bottom plate a on a main beam of bridge steel; S2: welding the two long edges of the inverted U-shaped perforated steel plate units 1 to the upper surface of the bottom steel plate a; S3: welding the bar-mat reinforcements 2 to the upper ends of the inverted U-shaped perforated steel plate units 1; and S4: pouring bridge deck concrete onto the bottom steel plate a, pouring and ramming the interior and exterior of the inverted U-shaped perforated steel plate unit 1 compactly, then covering the bottom steel plate and performing maintenance till a designed strength is reached so as to finally form an intact bridge deck slab.

(34) In step S2 of the embodiment, common studs can further be welded to the upper surface of the bottom steel plate a at this time, and the common studs can further be located inside the inverted U-shaped perforated steel plate unit 1.

(35) Eventually, the steel-concrete composite bridge deck slab features prominent shear performance

(36) Detailed description has been made on the embodiments of the present disclosure in combination of the accompanying draws above. But the present disclosure is not limited to the above-mentioned implementation modes. Those of ordinary skill further can make various modifications without departing from the concept of the present disclosure within their knowledge. These are modifications without inventiveness, and those in the scope of claims of the present disclosure are protected by patent law.