CN217896219U - Steel-concrete combined bridge deck adopting inverted U-shaped shear connector - Google Patents
Steel-concrete combined bridge deck adopting inverted U-shaped shear connector Download PDFInfo
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- CN217896219U CN217896219U CN202221595734.5U CN202221595734U CN217896219U CN 217896219 U CN217896219 U CN 217896219U CN 202221595734 U CN202221595734 U CN 202221595734U CN 217896219 U CN217896219 U CN 217896219U
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Abstract
The utility model belongs to the technical field of bridge structures, especially, relate to an adopt steel-concrete combination decking of type of falling U shear connector. The utility model discloses a pour formation bridge floor concrete layer on the end steel sheet to set up the type of falling U trompil steel sheet unit on the end steel sheet, set up the mode of reinforcing bar net on the type of falling U trompil steel sheet unit, make this steel-concrete combination decking's anti shearing bearing capacity obtain further promotion.
Description
Technical Field
The utility model belongs to the technical field of bridge structures, especially, relate to an adopt steel-concrete combination decking of type of falling U shear connector.
Background
The bridge deck is used as an important component of a bridge structure, directly bears wheel pressure and impact of vehicles on the upper portion, the working state of the bridge deck directly influences the service performance of the bridge, the bridge deck structure is correctly selected, and significance is achieved in bridge design.
A steel-concrete combined bridge deck is a novel bridge deck which is integrally and commonly stressed and is formed by combining a steel bottom plate and upper-layer concrete through shear connectors in various forms such as studs or perforated steel plate connectors (PBL). Under the load action, the composite advantage of strong tensile property of steel and strong compressive property of concrete can be fully exerted.
At present, in the steel-concrete composite bridge deck slab structure, elastic connectors such as densely-distributed shear-resistant studs or rigid connectors such as perforated steel Plates (PBL) are generally adopted to be combined with studs, and even longitudinal steel bars penetrate into holes of the perforated steel plate connectors (PBL) to be connected with the studs densely distributed in other areas, so as to improve the shear-resistant bearing capacity of the whole steel-concrete composite bridge deck slab.
In the combined shear connector, the perforated steel plate has higher self-sliding resistance rigidity and high 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 plate, is an innovation and development of the traditional steel bar-concrete combined plate, and is more suitable for being used as a bridge deck plate with large bearing load, complex load bearing and fatigue load bearing effect.
However, the bridge deck adopts a mode of densely distributing the shear-resistant studs, so that the construction working surface and the workload can be remarkably increased, and the stud welding quality is influenced by various factors such as the welding skills of technicians and welding equipment. However, the shear connector using the combination of the perforated steel plate connectors (PBL) and the studs still needs to match a large number of studs to meet the requirements of the shear design.
And adopt trompil steel sheet connecting Piece (PBL) + peg + novel shear combination connecting piece of longitudinal reinforcement, then at first need pass longitudinal reinforcement at trompil steel sheet hole, the reinforcing bar shear cross-section in the trompil cross-section is very little, and its and downthehole concrete cross-section form the shear resistance of reinforcing bar + bolt combination of concrete and compare in the whole concrete cross-section bolt of steel sheet trompil shear performance promotion very little.
Secondly, the rigid perforated steel plate connecting Piece (PBL) has large self rigidity and small contact area with bridge deck concrete, and cracks are easy to appear on a joint interface of steel and concrete after bearing load. Finally, the novel combined shear connector adopting the perforated steel plate connector (PBL) + the stud and the longitudinal steel bar still needs to be jointly sheared with the stud to meet the shear design requirement, the bridge deck structure is complex in structure, the construction operation surface is large, the steel consumption and the dead weight of the bridge deck are increased, the economy is low, the application of the novel combined shear connector in a bridge deck of a bridge with a larger span is limited, and the novel combined shear connector does not accord with the development direction of continuous durability, light weight and convenient construction of the bridge deck system of the bridge.
Therefore, a structural form of the steel-concrete combined bridge deck slab and a construction method thereof which have the advantages of reasonable structural stress, light self weight, excellent durability, convenient construction and strong economic practicability are needed to be designed, and the problems of complex structure and construction, large operation area, multiple diseases, low durability and the like of the conventional steel-concrete combined bridge deck slab can be effectively solved.
Patent publication number is CN214328517U, announce day is 2021.10.01's chinese utility model patent, a steel ingot mills round steel fiber concrete combination decking U type connection structure is disclosed, the decking surface is provided with the U type strengthening rib of inversion, a plurality of through-holes have been seted up to the strengthening rib both sides, replace the rivet originally for the U type strengthening rib of inversion that has the through-hole, the steel sheet has been increased, the concrete, area of contact between the strengthening rib three, the inflow of concrete can be allowed to the through-hole of setting, make the strengthening rib can all bury in the concrete.
However, U type strengthening rib + strong rib structure in the utility model patent is exactly the cotter combination of foretell reinforcing bar + concrete, and it is compared in the shearing resistance promotion of the full concrete cross-section cotter of steel sheet trompil very little, is showing on the contrary and has increased the bridge weight, has increased the numerous and diverse degree of construction.
SUMMERY OF THE UTILITY MODEL
The utility model provides an adopt type of falling U shear connector's steel-concrete composite bridge panel, it can be through pouring formation bridge floor concrete layer on the end steel sheet to set up type of falling U trompil steel sheet unit on the end steel sheet, set up the mode of reinforcing bar net on type of falling U trompil steel sheet unit, make this steel-concrete composite bridge panel's anti-shear bearing capacity obtain further promotion.
Furthermore, the utility model provides a construction method of this combination decking, it can be through fixed end steel sheet earlier, weld the type of falling U trompil steel sheet unit again, then weld the reinforcing bar net, pour the mode that forms bridge floor concrete layer at last, accomplish this combination decking's whole work progress simple relatively, high-efficiently.
The utility model provides a technical scheme that above-mentioned problem adopted is: the steel-concrete combined bridge deck slab adopting the inverted-U-shaped shear connectors structurally comprises a bottom steel plate and a bridge deck concrete layer, wherein inverted-U-shaped perforated steel plate units are arranged on the upper surface of the bottom steel plate, and a reinforcing mesh is arranged at the upper ends of the inverted-U-shaped perforated steel plate units.
The further preferred technical scheme is as follows: the length direction of the inverted U-shaped perforated steel plate unit is the transverse bridge direction of the bridge deck, and two long edges of the inverted U-shaped perforated steel plate unit are all arranged on the upper surface of the bottom steel plate.
The further preferred technical scheme is as follows: the inverted U-shaped perforated steel plate unit comprises two inverted U-shaped steel plates with long edges bent downwards, is arranged on the long edge axial central axis of each inverted U-shaped steel plate and is used for forming top perforated holes of the concrete shear-resistant studs, and two rows of side perforated holes which are respectively arranged at the positions on the two sides of each top perforated hole and are used for forming the concrete shear-resistant studs.
The further preferred technical scheme is as follows: the shape of the top opening and the shape of the side opening are both oval, and the long axial direction of the oval is the long side direction of the inverted U-shaped steel plate.
The further preferred technical scheme is as follows: the length of the short shaft of the side opening is greater than 1/2 of the height of the inverted U-shaped opening steel plate unit; and the length of the short shaft of the top opening is greater than 1/2 of the width of the inverted U-shaped opening steel plate unit.
The further preferred technical scheme is as follows: and the inverted U-shaped steel plate is also provided with a connecting frame body unit for installing the reinforcing mesh.
The further preferred technical scheme is as follows: the connection support body unit comprises a vertical rectangular plate, the vertical rectangular plate is arranged on the bottom edge of the vertical rectangular plate and used for being clamped into the arc-shaped groove of the inverted U-shaped steel plate, the connection support body unit is arranged on the upper surface of the vertical rectangular plate and used for installing a half-cut pipe of a steel bar below the steel bar net.
The further preferred technical scheme is as follows: the connecting frame body unit further comprises through holes arranged between the arc-shaped groove and the vertical side face of the vertical rectangular plate, and inserting columns arranged on the two through holes and penetrating through the two side openings.
The further preferred technical scheme is as follows: the connecting frame body unit further comprises two fastening nuts which are arranged at two ends of the inserting column respectively and used for clamping the vertical side face of the vertical rectangular plate.
The construction method of the steel-concrete combined bridge deck adopting the inverted U-shaped shear connector sequentially comprises the following steps of:
s1, fixing the bottom steel plate on a bridge steel main beam;
s2, welding two long edges of the inverted U-shaped perforated steel plate unit on the upper surface of the bottom steel plate;
s3, welding the reinforcing mesh at the upper end of the inverted U-shaped perforated steel plate unit;
and S4, pouring bridge deck concrete on the bottom steel plate, pouring and tamping the inside and the outside of the inverted U-shaped perforated steel plate unit to be compact, covering and maintaining until the designed strength is reached, and finally forming a complete bridge deck.
The utility model has the advantages of the following.
Firstly, the bridge deck concrete layer forms a large number of concrete shear-resistant studs with large cross sections on the inverted U-shaped perforated steel plate units, and the shear resistance of the bridge deck is obviously enhanced.
Secondly, the whole of the inverted U-shaped perforated steel plate unit and the reinforcing mesh forms an internal reinforcing steel bar framework of a bridge deck concrete layer, and the structural integrity of the bridge deck is further improved.
And thirdly, a connecting frame body unit is arranged between the inverted U-shaped perforated steel plate unit and the reinforcing mesh to ensure that the reinforcing mesh has sufficient welding area and is firmly welded with the inverted U-shaped perforated steel plate unit.
Fourthly, the relative height of the reinforcing mesh compared with the bottom steel plate can be further adjusted by the connecting frame body unit.
Fifthly, the connecting frame body unit can also reinforce the inverted U-shaped perforated steel plate unit.
Sixthly, the construction method of the whole combined bridge deck slab is relatively simple and convenient, the steel structure is firstly arranged on the concrete structure from bottom to top, and the construction operation is reasonable and orderly.
Drawings
Fig. 1 is a schematic view of the cross-sectional structure along the longitudinal bridge direction of the present invention.
Fig. 2 is a schematic structural shape diagram of the inverted U-shaped perforated steel plate unit when the unit is not bent.
Fig. 3 is a schematic view of the position structure of the middle connection frame unit of the present invention.
Fig. 4 is a schematic view of the usage of the middle half-section pipe of the present invention.
Fig. 5 is a schematic view of the position structure of the middle insertion column of the present invention.
Fig. 6 is a schematic diagram of the position structure of the middle fastening nut of the present invention.
In the drawings, the reference numerals have the following meanings: the steel plate unit comprises a longitudinal bridge A, a bottom steel plate a, a bridge deck concrete layer b, an inverted U-shaped perforated steel plate unit 1, a reinforcing mesh 2, an inverted U-shaped steel plate 101, a top perforated hole 102, a side perforated hole 103, a connecting frame body unit 3, a vertical rectangular plate 301, an arc-shaped groove 302, a half-section pipe 303, a through hole 304, an inserting column 305 and a fastening nut 306.
Detailed Description
The following description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
As shown in the accompanying drawings 1-6, the steel-concrete composite bridge deck slab adopting the inverted U-shaped shear connectors structurally comprises 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, and a reinforcing mesh 2 is arranged at the upper end of the inverted U-shaped perforated steel plate unit 1.
In this embodiment, the arrangement extending direction of the plurality of inverted U-shaped perforated steel plate units 1 is the longitudinal direction of the deck slab, i.e. the driving direction, and the inverted U-shaped perforated steel plate units 1 themselves are a large shear connector.
The length direction of the inverted U-shaped perforated steel plate unit 1 is the transverse bridge direction of the bridge deck, and two long edges of the inverted U-shaped perforated steel plate unit 1 are all arranged on the upper surface of the bottom steel plate a.
In this embodiment, the inverted U-shaped perforated steel plate unit 1 is welded to the upper surface of the bottom steel plate a. In addition, the upper surface of the bottom steel plate a can be provided with common shear-resistant studs.
The inverted-U-shaped perforated steel plate unit 1 comprises two inverted-U-shaped steel plates 101 with long sides bent downwards, a top perforated hole 102 which is arranged on the axial central axis of the long sides of the inverted-U-shaped steel plates 101 and used for forming a concrete shear-resistant stud, and two rows of side perforated holes 103 which are respectively arranged at two sides of the top perforated hole 102 and used for forming the concrete shear-resistant stud.
In this embodiment, the inverted U-shaped steel plate 101 is formed by bending a rectangular straight steel plate, and is fixed in an inverted U-shaped pattern after being bent. In addition, the top opening 102 and the side openings 103 are also opened during the rectangular straight steel plate.
The shapes of the top opening hole 102 and the side opening hole 103 are both oval, and the long axial direction of the oval is the long axial direction of the inverted U-shaped steel plate 101.
In this embodiment, the shapes of the top opening 102 and the side opening 103 cannot be polygons, such as rectangles, triangles, etc., because the force is too concentrated at the corners of the polygons, and the inverted U-shaped steel plate 101 is easily cracked at the corners of the openings. Further, it is preferable that the circular holes are formed, and the problem of the concentration of the stress can be appropriately alleviated, but for the long-shaped inverted U-shaped steel plate 101, if the circular holes are too small, the formed concrete shear pin is not large enough and the shear performance is general, and if the circular holes are too large, an excessively small width region is easily formed at the inverted U-shaped steel plate 101, and the region is also easily broken.
Therefore, the oval shape is most preferable, and the oval shape with the transverse long axis can relieve the problem of the thin side edge of the steel plate caused by the round hole.
The length of the short axis of the side opening 103 is greater than 1/2 of the height of the inverted U-shaped opening steel plate unit 1; the length of the short axis of the top opening hole 102 is larger than 1/2 of the width of the inverted U-shaped opening steel plate unit 1.
In this embodiment, the minor axis length of the side opening 103 and the minor axis length of the top opening 102 are both the plane dimensions of the steel plate before bending, and both the oval holes are as large as possible, so that the dimension specifications of the concrete shear-resistant stud formed at the side opening 103 and the top opening 102 are increased as large as possible on the premise that the structural strength of the inverted U-shaped steel plate 101 is not significantly reduced, so as to improve the shear resistance of the whole composite bridge deck.
The inverted U-shaped steel plate 101 is further provided with a connecting frame body unit 3 for installing the reinforcing mesh 2.
In this embodiment, if there is no connection frame unit 3, the effect of using the mesh reinforcement 2 has at least the following 2 disadvantages: firstly, the top of the inverted U-shaped steel plate 101 has only a little area which can be used for welding the reinforcing mesh 2, so that the welding between the two is not firm enough; second, once the height of the inverted U-shaped steel plate 101 is determined, the mesh reinforcement 2 cannot be adjusted in height up and down properly.
Therefore, the solution to the above two problems is precisely the purpose of the arrangement of the connection frame unit 3.
Connect support body unit 3 includes vertical rectangular plate 301, sets up on the vertical rectangular plate 301 base, and be used for the card to go into the arc wall 302 of the type of falling U steel sheet 101, and set up on the vertical rectangular plate 301 upper surface, and be used for the installation half section pipe 303 of reinforcing bar net 2 below reinforcing bar.
In this embodiment, the use of the connection frame unit 3 is required for the mesh reinforcement 2, that is: the reinforcing bars under the mesh reinforcement 2 must be perpendicular to the longitudinal direction of the inverted U-shaped steel plate 101.
Therefore, arc wall 302 welding the upper surface of inverted U-shaped steel sheet 101, half section pipe 303 welding the reinforcing bar in the below of reinforcing bar net 2 guarantees that two weldings all have enough big face of weld. Of course, the vertical rectangular plate 301 is initially integrally formed with the half-section pipe 303 or is already welded firmly.
Finally, the upper side of the inverted U-shaped steel plate 101 does not need to be connected with each lower steel bar of the mesh reinforcement 2 through the connection frame unit 3, as long as the fixing strength of the mesh reinforcement 2 is ensured to meet the design requirement.
The connection frame unit 3 further includes through holes 304 disposed between the arc-shaped slots 302 and the vertical side surfaces of the vertical rectangular plates 301, and insertion posts 305 disposed on the two through holes 304 and penetrating through the two side openings 103.
In this embodiment, the inserting column 305 sequentially passes through the first through hole 304, the first side opening hole 103, the second side opening hole 103, and the second through hole 304, so as to ensure that the vertical rectangular plate 301 and the inverted U-shaped steel plate 101 have a clamping and fixing function at the inserting column 305 in addition to the welding position, and finally ensure that the connecting frame unit 3 can be firmly mounted on the inverted U-shaped steel plate 101.
Of course, it should be noted that the plug posts 305 must not be too thick to significantly reduce the dimensional specifications of the concrete shear studs formed at the side openings 103.
The connection frame unit 3 further comprises two fastening nuts 306 respectively disposed at two ends of the insertion column 305 and used for clamping the vertical side of the vertical rectangular plate 301.
In this embodiment, threaded sections are further disposed at two ends of the insertion column 305, and after the threaded sections are matched with the fastening nut 306, the insertion column 305 can be further fixed and fastened.
The construction method of the steel-concrete combined bridge deck adopting the inverted U-shaped shear connector sequentially comprises the following steps of:
s1, fixing the bottom steel plate a on a bridge steel girder;
s2, welding two long sides 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;
and S4, pouring bridge deck concrete on the bottom steel plate a, pouring and compacting the inside and the outside of the inverted U-shaped perforated steel plate unit 1, covering and maintaining until the designed strength is achieved, and finally forming a complete bridge deck.
In S2 of this embodiment, a common stud may be welded to the upper surface of the bottom steel plate a, and the common stud may be located inside the inverted U-shaped perforated steel plate unit 1.
Finally, the steel-concrete composite bridge deck has outstanding shear resistance.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. These are non-inventive modifications, which are intended to be protected by patent laws within the scope of the appended claims.
Claims (9)
1. Adopt steel-concrete combination decking of type of falling U shear connector, its characterized in that: the structure includes end steel sheet (a) and bridge floor concrete layer (b), be equipped with on end steel sheet (a) upper surface and fall U type trompil steel sheet unit (1), fall U type trompil steel sheet unit (1) upper end is equipped with reinforcing bar net (2).
2. The steel-concrete composite decking employing the inverted U-shaped shear connectors according to claim 1, wherein: the length direction of the inverted U-shaped perforated steel plate unit (1) is the transverse bridge direction of the bridge deck, and two long edges of the inverted U-shaped perforated steel plate unit (1) are all arranged on the upper surface of the bottom steel plate (a).
3. The steel-concrete composite decking employing the inverted U-shaped shear connectors defined in claim 1 wherein: the inverted U-shaped perforated steel plate unit (1) comprises two inverted U-shaped steel plates (101) with long sides bent downwards, top perforated holes (102) which are formed in the axial central axis of the long sides of the inverted U-shaped steel plates (101) and used for forming concrete shear studs, and two rows of side perforated holes (103) which are respectively formed in positions on two sides of the top perforated holes (102) and used for forming the concrete shear studs.
4. The steel-concrete composite decking employing the inverted U-shaped shear connectors defined in claim 3 wherein: the shapes of the top opening hole (102) and the side opening hole (103) are both oval, and the long axial direction of the oval is the long side direction of the inverted U-shaped steel plate (101).
5. The steel-concrete composite decking employing the inverted U-shaped shear connectors defined in claim 4 wherein: the length of a short shaft of the side opening (103) is greater than 1/2 of the height of the inverted U-shaped opening steel plate unit (1); the length of the short axis of the top opening (102) is larger than 1/2 of the width of the inverted U-shaped opening steel plate unit (1).
6. The steel-concrete composite decking employing the inverted U-shaped shear connectors defined in claim 3 wherein: the inverted U-shaped steel plate (101) is further provided with a connecting frame body unit (3) used for installing the reinforcing mesh (2).
7. The steel-concrete composite decking employing the inverted U-shaped shear connectors defined in claim 6 wherein: connect support body unit (3) including vertical rectangular plate (301), set up on vertical rectangular plate (301) bottom, and be used for the card to go into arc wall (302) of the type of falling U steel sheet (101), and set up on vertical rectangular plate (301) upper surface, and be used for the installation half section pipe (303) of reinforcing bar net (2) below reinforcing bar.
8. The steel-concrete composite decking employing the inverted U-shaped shear connectors defined in claim 7 wherein: the connecting frame body unit (3) further comprises through holes (304) arranged between the arc-shaped groove (302) and the vertical side face of the vertical rectangular plate (301), and inserting columns (305) arranged on the two through holes (304) and penetrating through the two side openings (103).
9. The steel-concrete composite decking employing the inverted U-shaped shear connectors defined in claim 8 wherein: the connecting frame body unit (3) further comprises two fastening nuts (306) which are respectively arranged at two ends of the inserting column (305) and used for clamping the vertical side face of the vertical rectangular plate (301).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11840811B1 (en) | 2022-06-24 | 2023-12-12 | Fuzhou University | Steel-concrete composite bridge deck slab using inverted U-shaped shear connectors and method for constructing same |
| US11840812B1 (en) | 2022-09-29 | 2023-12-12 | Fuzhou University | Steel-concrete composite bridge deck slab with steel tube-prefobond rib shear connectors and method for constructing same |
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2022
- 2022-06-24 CN CN202221595734.5U patent/CN217896219U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11840811B1 (en) | 2022-06-24 | 2023-12-12 | Fuzhou University | Steel-concrete composite bridge deck slab using inverted U-shaped shear connectors and method for constructing same |
| US11840812B1 (en) | 2022-09-29 | 2023-12-12 | Fuzhou University | Steel-concrete composite bridge deck slab with steel tube-prefobond rib shear connectors and method for constructing same |
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