CN114892499B - Prefabricated assembled steel-concrete composite girder bridge shearing-resistant connecting piece and construction method - Google Patents
Prefabricated assembled steel-concrete composite girder bridge shearing-resistant connecting piece and construction method Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 82
- 238000010008 shearing Methods 0.000 title claims abstract description 43
- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 238000010276 construction Methods 0.000 title abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 240
- 239000010959 steel Substances 0.000 claims abstract description 240
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 59
- 230000000149 penetrating effect Effects 0.000 claims abstract description 49
- 239000011178 precast concrete Substances 0.000 claims abstract description 25
- 229910052742 iron Inorganic materials 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 20
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 21
- 230000002787 reinforcement Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 239000011374 ultra-high-performance concrete Substances 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 description 7
- 238000005336 cracking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a prefabricated steel-concrete composite girder bridge shearing-resistant connecting piece and a construction method, and belongs to the field of civil engineering steel-concrete composite girder bridges. The high-performance grouting material mainly comprises a precast concrete bridge deck, an I-shaped steel beam, a precast double-row Y-shaped notched perforated steel plate, a common steel plate, U-shaped penetrating steel bars, a precast top layer common steel bar with an end, a precast bottom layer common steel bar with an end, hooks, iron rings, iron wires and high-performance grouting material; the prefabricated double-row Y-shaped notched perforated steel plate is welded on the I-shaped steel beam, the common steel plate is welded at the two ends of the prefabricated double-row Y-shaped notched perforated steel plate, the common steel bar with the end head of the prefabricated bottom layer and the U-shaped penetrating steel bar penetrating through the prefabricated double-row Y-shaped notched perforated steel plate are hooked tightly by a hook, the common steel bar with the end head of the prefabricated top layer and the iron wires are bound, and grouting materials are poured in the shear grooves of the concrete bridge deck. The invention can fully ensure the effective transfer of the shearing force between the concrete bridge deck and the I-shaped steel beam, and has good shearing resistance and fatigue resistance.
Description
Technical Field
The invention relates to a prefabricated steel-concrete composite girder bridge shearing-resistant connecting piece and a construction method, and belongs to the field of civil engineering steel-concrete composite girder bridges.
Background
With the rapid development of urban construction and the increasing demand for reconstruction and expansion, the bridge rapid construction technology (ABC) concept is increasingly valued by the engineering world. The method has the advantages of improving the site workability of the bridge structure, ensuring the material quality and the durability of the structure, reducing the influence of construction on the surrounding environment and citizens life, being more convenient and rapid in later maintenance and replacement, and the like.
The steel-concrete composite girder bridge has the advantages of reasonable stress, good overall stability and local stability, convenient prefabrication construction, combined advantages of concrete and steel, wide span application range, high benefit and the like, is rapidly developed at home and abroad, is widely applied to the field of bridges, and achieves remarkable economic benefit. In the existing steel-concrete composite beam bridge in China, most bridge decks adopt a mode of casting concrete on site, the casting quantity is large, the maintenance time is long, the construction period is greatly prolonged, the construction efficiency is reduced, and the surrounding traffic and resident life are influenced. Therefore, the prefabricated assembly technology is necessary to be introduced into the construction of the steel-hybrid composite girder bridge, so that the construction progress can be quickened, the labor cost can be reduced, and the overall quality of the steel-hybrid composite girder bridge is improved.
In steel-hybrid composite girder bridges, shear connectors are often used to achieve synergy of several different materials or structures. The shearing connector is the guarantee of the cooperative work of steel and concrete. The main functions are two: the first is used for bearing and transmitting the longitudinal shearing force between the steel and the concrete; and the second is used for resisting the lifting effect between steel and concrete. The shearing connectors which are commonly used at present are pin connectors, perforated plate connectors and profile steel connectors. The fatigue resistance of the peg connection is poor and the pull-out force is very weak. The perforated plate connecting piece has the problems that the positioning of the penetrating steel bars is difficult and the arrangement is difficult. The steel connecting piece has weak tensile pulling performance, and is easy to separate steel from concrete. Each of these connection modes has its own advantages and limitations in terms of construction and stress performance. Under the action of long-term heavy traffic load and severe environment, the traditional steel-concrete composite girder bridge has the problems of poor durability, fast mechanical property degradation, easiness in cracking and the like, and becomes a problem which needs to be solved in the bridge engineering industry.
Therefore, in order to accelerate the rapid construction of the steel-concrete composite girder bridge, the research on the shear connector with reliable connection, convenient construction and good overall performance is an urgent need of the current steel-concrete composite girder bridge engineering construction, and the novel prefabricated assembled steel-concrete composite girder bridge shear connector is provided, the high-performance grouting material is applied to the connection of the prefabricated concrete bridge deck and the steel girder, the shear force transmission of the bridge deck and the steel girder is ensured, and the shear resistance and fatigue resistance of the bridge deck and the steel girder are improved.
Disclosure of Invention
In order to solve the problems of poor durability, rapid mechanical property degradation, easiness in cracking and the like of the traditional steel-concrete composite girder bridge, reduce the dosage of cast-in-place concrete and improve the mechanical property of a shearing-resistant connecting piece, the invention provides a shearing-resistant connecting piece of a prefabricated assembled steel-concrete composite girder bridge and a construction method thereof, which are used for transmitting shearing force between a concrete bridge deck and a steel girder.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a prefabricated steel-concrete composite girder bridge shear connector comprises an I-steel girder and a prefabricated concrete bridge deck plate arranged on the I-steel girder, wherein a shear groove is arranged in the prefabricated concrete bridge deck plate; the shearing force groove is internally provided with a prefabricated double-row Y-shaped notched perforated steel plate, a common steel plate, U-shaped penetrating steel bars, prefabricated top-layer common steel bars with ends, prefabricated bottom-layer common steel bars with ends, hooks, iron rings and iron wires, and grouting materials are poured in the shearing force groove;
The prefabricated double-row Y-shaped notched perforated steel plate is welded on the I-steel beam, and the common steel plate is welded on two sides of the prefabricated double-row Y-shaped notched perforated steel plate, so that the common steel plate and the prefabricated double-row Y-shaped notched perforated steel plate form a whole; the prefabricated double-row Y-shaped notched perforated steel plate consists of two identical Y-shaped notched perforated steel plates, each Y-shaped notched perforated steel plate is vertically cut downwards from the top at intervals to form a plurality of sections of steel plates, two adjacent sections of steel plates are oppositely bent to form a certain angle, each section of steel plate is provided with a hole, and the outer edge of each hole is provided with a notch;
The U-shaped penetrating steel bar vertically passes through the center of a hole of the prefabricated double-row Y-shaped notched perforated steel plate and is vertically and downwards buckled on the prefabricated double-row Y-shaped notched perforated steel plate;
The upper and lower parts of the inner walls of the precast concrete bridge deck plates at the two sides of the shear groove are respectively provided with precast top layer common reinforcing steel bars with ends and precast bottom layer common reinforcing steel bars with ends;
The prefabricated bottom layer strip end common reinforcing steel bar is hooked with the U-shaped penetrating reinforcing steel bar bottom penetrating through the prefabricated double-row Y-shaped grooved opening perforated steel plate by a hook, an iron ring is welded at the other end of the hook, an iron wire is bound on the iron ring, and the other end of the iron wire is bound on the prefabricated top layer strip end common reinforcing steel bar and used for enabling the prefabricated bottom layer strip end common reinforcing steel bar and the U-shaped penetrating reinforcing steel bar to bear shearing force jointly.
Further, the common reinforcement with the end head of the prefabricated top layer and the common reinforcement with the end head of the prefabricated bottom layer in the prefabricated concrete bridge deck extend out of the inner wall of the shear groove of the prefabricated concrete bridge deck for a distance, and the extending distance of the common reinforcement with the end head of the prefabricated top layer is slightly smaller than that of the common reinforcement with the end head of the prefabricated bottom layer; the prefabricated top layer common reinforcing steel bars with the ends and the prefabricated bottom layer common reinforcing steel bars with the ends can increase the bonding strength and the integrity of the prefabricated concrete bridge deck and the rear pouring slurry.
Further, the two ends of the U-shaped penetrating steel bar are bent downwards to enlarge the anti-splicing contact surface area of the U-shaped penetrating steel bar, and the U-shaped penetrating steel bar is convenient to connect with the common steel bar with the end head of the prefabricated bottom layer.
Further, the diameter of the U-shaped penetrating steel bar is smaller than the hole diameter and the notch width of the prefabricated double-row Y-shaped notched steel plate.
Further, the prefabricated double-row Y-shaped notched perforated steel plate is reserved with a distance from the two ends of the prefabricated concrete bridge deck along the bridge direction so as to exert the end shearing resistance of the prefabricated double-row Y-shaped notched perforated steel plate.
Further, a small distance is reserved between the common reinforcement with the end head of the prefabricated bottom layer and the prefabricated double-row Y-shaped grooved opening steel plate, so that collision between the prefabricated bottom layer and the prefabricated double-row Y-shaped grooved opening steel plate is prevented when the prefabricated concrete bridge deck is hoisted.
Further, the inner surface of the precast concrete deck shear groove is roughened so that sufficient shear strength is provided between the precast concrete and the grouting material.
Further, the grouting material is ultra-high performance concrete UHPC.
The construction method of the prefabricated steel-concrete composite girder bridge shear connector comprises the following steps:
Step one: the prefabricated part is prepared in a factory, and the concrete steps are as follows:
1) Arranging longitudinal steel bars and prefabricated top-layer common steel bars with ends and prefabricated bottom-layer common steel bars with ends in a template of the prefabricated concrete bridge deck;
2) Pouring concrete of the precast concrete bridge deck;
3) Preparing I-shaped steel beams, common steel plates and U-shaped penetrating steel bars according to the design size;
4) Preparing a hook and an iron ring according to the design size, welding the iron ring at the tail end of the hook, and winding iron wires with a certain length on the iron ring;
5) Preparing a prefabricated double-row Y-shaped notched perforated steel plate according to the design size: the method comprises the steps of (1) carrying out partial cutting on Y-shaped notched perforated steel plates at regular intervals through an angle grinder, bending steel plates on two sides of the cut part in opposite directions for a certain angle, perforating at the center of each bent steel plate, and slotting to form notches;
6) Welding the prefabricated double-row Y-shaped grooved opening steel plates on the I-shaped steel beam, and welding common steel plates on two sides of the prefabricated double-row Y-shaped grooved opening steel plates to form a whole;
Step two: the method for assembling and pouring the prefabricated steel-concrete composite girder bridge shearing-resistant connecting piece on site comprises the following specific steps:
1) Coating lubricating oil on the surfaces of the prefabricated double-row Y-shaped perforated steel plate with the grooves and the common steel plate so as to eliminate the influence of friction on the shearing resistance of the connecting piece;
2) Hoisting the precast concrete deck slab to position by using a crane;
3) The two ends of each U-shaped penetrating steel bar are hooked tightly with the common steel bars with the ends of the prefabricated bottom layer belt, and the other ends of the hooks are bound with the common steel bars with the ends of the prefabricated top layer belt by iron wires;
4) Pouring grouting material in the shear groove of the precast concrete deck slab.
Compared with the prior art, the invention has the following technical effects:
1. According to the invention, the shear groove is reserved on the precast concrete deck slab, high-performance grouting material or UHPC is poured in the shear groove, compared with the full cast-in-place concrete deck slab, the pouring quantity can be greatly reduced, the construction efficiency is improved, and the excellent performance of the grouting material is fully exerted.
2. The invention binds the penetrating steel bars with the common steel bars at the ends of the prefabricated belt, not only can play the role of preventing concrete cracking of the steel bars in the prefabricated bridge deck, but also can play the shearing function of the steel bars, and improve the shearing bearing capacity and the ductility of the structure.
3. According to the invention, the perforated steel plate is bent at a certain angle at intervals, and compared with the traditional shearing-resistant connecting piece for the perforated steel plate with the through length arrangement, the end bearing function of the perforated steel plate is better utilized, and the perforated steel plate has higher shearing-resistant bearing capacity, higher initial rigidity and better ductility.
4. The invention is slotted at the top of the steel plate with the Y-shaped slotted opening, can lead the penetrating steel bar to be directly and vertically placed from the slotted position, and can accurately position the penetrating steel bar. Compared with the traditional perforated steel plate shearing-resistant connecting piece, the perforated steel plate shearing-resistant connecting piece has the advantages of reducing perforation operation and reducing construction difficulty.
5. The shear connector with reliable connection can ensure that the combined section formed by the concrete bridge deck and the steel beam can resist the effect generated by the integral stress of the bridge together, and has higher shear bearing capacity and better ductility. Not only can realize the bracket-free construction, the cast-in-situ engineering is less, the whole construction process is accelerated, but also the fatigue resistance is good.
Drawings
FIG. 1 is an overall schematic view of a prefabricated steel-hybrid composite girder bridge shear connector;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view of B-B of FIG. 1;
FIG. 4 is a top view of a prefabricated steel-hybrid composite girder bridge shear connector;
FIG. 5 is an overall schematic view of a prefabricated double row Y-shaped slotted perforated steel sheet welded with a conventional steel sheet;
FIG. 6 is a plan view of a hook with an iron ring and iron wire;
FIG. 7 is a schematic view of a portion of a shear groove of a prefabricated steel-hybrid composite girder bridge shear connector;
FIG. 8 is a schematic view of a construction flow of a prefabricated steel-hybrid composite girder bridge shear connector;
In the figure, a 1-precast concrete bridge deck, a 2-I-shaped steel beam, a 3-precast double-row Y-shaped notched perforated steel plate, a 4-common steel plate, a 5-U-shaped penetrating steel bar, a 6-precast top layer strip end common steel bar, a 7-precast bottom layer strip end common steel bar, an 8-bent hook, a 9-iron ring, a 10-iron wire and an 11-grouting material.
Detailed Description
The present invention will be described in detail with reference to examples and fig. 1 to 8.
As shown in fig. 1 to 7, the shear connector for the prefabricated assembled steel-concrete composite girder bridge comprises an i-steel girder 2 and a prefabricated concrete bridge deck plate 1 arranged on the i-steel girder, wherein a shear groove is arranged in the prefabricated concrete bridge deck plate 1. The shear groove is internally provided with a prefabricated double-row Y-shaped notched perforated steel plate 3, a common steel plate 4, U-shaped penetrating steel bars 5, prefabricated top-layer common steel bars with ends 6, prefabricated bottom-layer common steel bars with ends 7, hooks 8, iron rings 9 and iron wires 10, and grouting materials 11 are poured in the shear groove, wherein in the embodiment, the grouting materials 11 are ultra-high-performance concrete UHPC.
The prefabricated double-row Y-shaped notched perforated steel plate 3 is welded on the I-beam 2, and the common steel plate 4 is welded on two sides of the prefabricated double-row Y-shaped notched perforated steel plate 3, so that the common steel plate 4 and the prefabricated double-row Y-shaped notched perforated steel plate 3 form a whole. As shown in fig. 5, the prefabricated double-row Y-shaped slotted perforated steel plate 3 is composed of two identical Y-shaped slotted perforated steel plates, each Y-shaped slotted perforated steel plate is vertically cut downwards from the top at intervals to form a plurality of sections of steel plates, two adjacent sections of steel plates are bent in opposite directions to form a certain angle, each section of steel plate is provided with a hole, and the outer edge of each hole is provided with a notch.
As shown in fig. 1 to 4, the U-shaped penetrating steel bar 5 vertically passes through the center of the hole of the prefabricated double-row Y-shaped notched perforated steel plate 3 and vertically and downwardly fastened on the prefabricated double-row Y-shaped notched perforated steel plate 3. The two ends of the U-shaped penetrating steel bar 5 are downwards bent to enlarge the anti-splicing contact surface area of the U-shaped penetrating steel bar, and the U-shaped penetrating steel bar is convenient to connect with the prefabricated bottom layer common steel bar 7 with the end socket. The diameter of the U-shaped penetrating steel bar 5 is smaller than the diameter of the holes of the prefabricated double-row Y-shaped steel plate 3 with the notch openings. The upper part and the lower part of the inner wall of the precast concrete bridge deck 1 at the two sides of the shear groove are respectively provided with precast top layer common reinforcing steel bars 6 with ends and precast bottom layer common reinforcing steel bars 7 with ends. The prefabricated top layer common reinforcing steel bars 6 with the end heads and the prefabricated bottom layer common reinforcing steel bars 7 in the prefabricated concrete bridge deck plate 1 extend out of the inner wall of the shear groove of the prefabricated concrete bridge deck plate 1 for a distance, and the extending distance of the prefabricated top layer common reinforcing steel bars 6 with the end heads is slightly smaller than the extending distance of the prefabricated bottom layer common reinforcing steel bars 7 with the end heads. The prefabricated top layer common reinforcing steel bars 6 with the end heads and the prefabricated bottom layer common reinforcing steel bars 7 with the end heads can increase the bonding strength and the integrity of the prefabricated concrete bridge deck 1 and the post-pouring slurry.
As shown in fig. 6-7, the bottom end of the prefabricated bottom layer strip end common steel bar 7 is hooked with the bottom end of the U-shaped penetrating steel bar 5 penetrating through the prefabricated double-row Y-shaped notched perforated steel plate 3 by using a hook 8, the other end of the hook 8 is welded with an iron ring 9, an iron wire 10 is bound on the iron ring 9, and the other end of the iron wire 10 is bound on the prefabricated top layer strip end common steel bar 6, so that the prefabricated bottom layer strip end common steel bar 7 and the U-shaped penetrating steel bar 5 bear shearing force together.
In this embodiment, the prefabricated double-row Y-shaped perforated steel plate 3 is reserved a distance from both ends of the precast concrete deck slab 1 along the forward bridge direction so as to exert the end shearing resistance of the prefabricated double-row Y-shaped perforated steel plate 3. A small distance is reserved between the prefabricated bottom layer common steel bars 7 with the end heads and the prefabricated double-row Y-shaped grooved perforated steel plates 3, so that collision between the prefabricated bottom layer common steel bars and the prefabricated double-row Y-shaped grooved perforated steel plates is prevented when the prefabricated concrete bridge deck 1 is hoisted. The inner surfaces of the shear grooves of the precast concrete deck slab 1 are roughened so that sufficient shear strength is provided between the precast concrete and the grout.
The principle is as follows: when the steel-concrete composite girder bridge works normally, the novel prefabricated assembled steel-concrete composite girder bridge shear connector can prevent the horizontal separation and the vertical separation of the steel girder and the concrete bridge deck, and can ensure the cooperative deformation between the steel girder and the prefabricated concrete bridge deck 1 by transferring the shearing force between the steel girder and the concrete bridge deck. In addition, during use of the steel-concrete composite girder, the steel girder and the precast concrete deck slab 1 relatively slip, thereby generating shearing force at the interface. The invention mainly provides shearing resistance by a prefabricated double-row Y-shaped notched perforated steel plate 3, a common steel plate 4 and U-shaped penetrating steel bars 5. The bending part steel plate of the prefabricated double-row Y-shaped notched perforated steel plate 3 can play a role in end shearing resistance, a concrete tenon can be formed between two steel plates bent along different directions, and meanwhile, a concrete tenon can be formed at the slotting and perforating positions, so that excellent shearing resistance can be exerted. The general steel plate 4 can improve the shear rigidity of the whole shear connector. The U-shaped penetrating steel bar 5 is bound with the iron wire 10, the prefabricated top layer common steel bar 6 with the end head and the prefabricated bottom layer common steel bar 7 with the end head through hooks 8 to form a whole. Under the shearing force, the U-shaped penetrating steel bars 5 work cooperatively with the prefabricated top layer common steel bars 6 and the prefabricated bottom layer common steel bars 7 to exert the shearing force together. When the steel beam and the concrete bridge deck are slid relatively, the concrete tenons in the prefabricated double-row Y-shaped grooved opening steel plates 3 exert the shearing resistance at first, when the strength of the concrete tenons is insufficient, the concrete tenons are cut or crushed by the double-row Y-shaped grooved opening steel plates 3, and at the moment, the shearing resistance is mainly exerted by the U-shaped penetrating steel bars 5, the prefabricated top-layer strip end common steel bars 6 and the prefabricated bottom-layer strip end common steel bars 7, and when the load continues to increase, the U-shaped penetrating steel bars 5 gradually enter a yield state, and finally the U-shaped penetrating steel bars 5 are bent and sheared to be damaged.
As shown in fig. 8, the construction method of the prefabricated steel-concrete composite girder bridge shear connector comprises the following steps:
Step one: the prefabricated part is prepared in a factory, and the concrete steps are as follows:
1) Longitudinal steel bars 6 and common steel bars 7 with ends of the prefabricated top layer and the prefabricated bottom layer are arranged in the templates of the prefabricated concrete bridge deck plate 1.
2) Concrete of the precast concrete deck slab 1 is poured.
3) And preparing the I-shaped steel beam 2, the common steel plate 4 and the U-shaped penetrating steel bar 5 according to the designed size.
4) The hook 8 and the iron ring 9 are prepared according to the designed size, the iron ring 9 is welded at the tail end of the hook 8, and a certain length of iron wire 10 is wound on the iron ring 9.
5) Preparing a prefabricated double-row Y-shaped notched open-pore steel plate 3 according to the design size: and (3) carrying out partial cutting on the Y-shaped notched perforated steel plate at regular intervals through an angle grinder, bending the steel plates at two sides of the cutting part in opposite directions by a certain angle, perforating at the center of each bent steel plate, and grooving to form notches.
6) The prefabricated double-row Y-shaped grooved opening steel plate 3 is welded on the I-steel beam 2, and the common steel plate 4 is welded on two sides of the prefabricated double-row Y-shaped grooved opening steel plate 3 to form a whole.
Step two: the method for assembling and pouring the prefabricated steel-concrete composite girder bridge shearing-resistant connecting piece on site comprises the following specific steps:
1) Lubricating oil is smeared on the surfaces of the prefabricated double-row Y-shaped grooved perforated steel plate 3 and the common steel plate 4 so as to eliminate the influence of friction on the shearing resistance of the connecting piece.
2) And hoisting the precast concrete deck slab 1 into place by using a crane.
3) The two ends of each U-shaped penetrating steel bar 5 are hooked with the common steel bars 7 with the ends of the prefabricated bottom layers by hooks 8, and the other ends of the hooks 8 are bound with the common steel bars 6 with the ends of the prefabricated top layers by iron wires 10.
4) Grouting material 11 is poured into the shear groove of the precast concrete deck slab 1.
The present invention has been described in detail above, but the disclosure should not be construed as limiting the scope of the invention, and all modifications of the shape and size of the shear connectors, the type of the penetrating reinforcement, the binding of the penetrating reinforcement and the prefabricated common reinforcement, the connection of the prefabricated concrete bridge deck and the post-cast segments, etc. according to the scope of the present invention are included in the patent coverage of the present invention.
Claims (9)
1. The utility model provides a prefabricated assembled steel-thoughtlessly make up bridge shear connector, its includes I-steel beam (2) and precast concrete decking (1) that set up on it, its characterized in that:
Shear grooves are formed in the precast concrete deck (1); the shearing force groove is internally provided with a prefabricated double-row Y-shaped notched perforated steel plate (3), a common steel plate (4), a U-shaped penetrating steel bar (5), a prefabricated top layer strip end common steel bar (6), a prefabricated bottom layer strip end common steel bar (7), a hook (8), an iron ring (9) and an iron wire (10), and grouting material (11) is poured in the shearing force groove;
The prefabricated double-row Y-shaped grooved opening steel plate (3) is welded on the I-shaped steel beam (2), and the common steel plate (4) is welded on two sides of the prefabricated double-row Y-shaped grooved opening steel plate (3), so that the common steel plate (4) and the prefabricated double-row Y-shaped grooved opening steel plate (3) form a whole; the prefabricated double-row Y-shaped notched perforated steel plate (3) is composed of two identical Y-shaped notched perforated steel plates, each Y-shaped notched perforated steel plate is vertically cut downwards from the top at intervals to form a plurality of sections of steel plates, two adjacent sections of steel plates are oppositely bent to form a certain angle, each section of steel plate is provided with a hole, and the outer edge of each hole is provided with a notch;
The U-shaped penetrating steel bar (5) vertically penetrates through the center of a hole of the prefabricated double-row Y-shaped slotted perforated steel plate (3) and is vertically and downwards buckled on the prefabricated double-row Y-shaped slotted perforated steel plate (3);
The upper part and the lower part of the inner wall of the precast concrete bridge deck (1) at two sides of the shear groove are respectively provided with precast top-layer common reinforcing steel bars (6) with ends and precast bottom-layer common reinforcing steel bars (7) with ends;
The prefabricated bottom layer strip end common steel bar (7) is hooked with a hook (8) penetrating through the bottom end of the U-shaped penetrating steel bar (5) of the prefabricated double-row Y-shaped notched perforated steel plate (3), an iron ring (9) is welded at the other end of the hook (8), an iron wire (10) is bound on the iron ring (9), and the other end of the iron wire (10) is bound on the prefabricated top layer strip end common steel bar (6) and used for enabling the prefabricated bottom layer strip end common steel bar (7) and the U-shaped penetrating steel bar (5) to bear shearing force together.
2. The prefabricated steel-concrete composite girder bridge shear connector according to claim 1, wherein: the prefabricated top layer common reinforcement bar (6) with the end head and the prefabricated bottom layer common reinforcement bar (7) in the prefabricated concrete bridge deck plate (1) extend out of the inner wall of the shear groove of the prefabricated concrete bridge deck plate (1) for a certain distance, and the extending distance of the prefabricated top layer common reinforcement bar (6) with the end head is slightly smaller than the extending distance of the prefabricated bottom layer common reinforcement bar (7) with the end head; the prefabricated top layer common reinforcing steel bars (6) with the end heads and the prefabricated bottom layer common reinforcing steel bars (7) with the end heads can increase the bonding strength and the integrity of the prefabricated concrete bridge deck (1) and the post-pouring slurry.
3. The prefabricated steel-concrete composite girder bridge shear connector according to claim 1, wherein: the two ends of the U-shaped penetrating steel bar (5) are bent downwards to enlarge the anti-splicing contact surface area of the U-shaped penetrating steel bar, and the U-shaped penetrating steel bar is convenient to connect with the prefabricated bottom layer strip end head common steel bar (7).
4. The prefabricated steel-concrete composite girder bridge shear connector according to claim 1, wherein: the diameter of the U-shaped penetrating steel bar (5) is smaller than the hole diameter and the notch width of the prefabricated double-row Y-shaped notched perforated steel plate (3).
5. The prefabricated steel-concrete composite girder bridge shear connector according to claim 1, wherein: the prefabricated double-row Y-shaped notched perforated steel plate (3) is reserved with two ends of the prefabricated concrete bridge deck (1) along the forward bridge direction for a certain distance so as to exert the end shearing resistance of the prefabricated double-row Y-shaped notched perforated steel plate (3).
6. The prefabricated steel-concrete composite girder bridge shear connector according to claim 1, wherein: a small distance is reserved between the prefabricated bottom layer common steel bar (7) with the end head and the prefabricated double-row Y-shaped notched opening steel plate (3), so that collision between the prefabricated bottom layer common steel bar and the prefabricated double-row Y-shaped notched opening steel plate is prevented when the prefabricated concrete bridge deck (1) is hoisted.
7. The prefabricated steel-concrete composite girder bridge shear connector according to claim 1, wherein: the inner surface of the shear groove of the precast concrete deck (1) is roughened so that enough shear strength exists between the precast concrete and the grouting material.
8. The prefabricated steel-concrete composite girder bridge shear connector according to claim 1, wherein: the grouting material (11) is ultra-high performance concrete UHPC.
9. A method of constructing a prefabricated steel-hybrid composite girder bridge shear connector according to any one of claims 1-8, comprising the steps of:
Step one: the prefabricated part is prepared in a factory, and the concrete steps are as follows:
1) Longitudinal steel bars (6) and common steel bars (7) with ends of the prefabricated top layer and the prefabricated bottom layer are arranged in the templates of the prefabricated concrete bridge deck (1);
2) Pouring concrete of the precast concrete deck (1);
3) Preparing an I-shaped steel beam (2), a common steel plate (4) and U-shaped penetrating steel bars (5) according to the design size;
4) Preparing a hook (8) and an iron ring (9) according to the designed size, welding the iron ring (9) at the tail end of the hook (8), and winding an iron wire (10) with a certain length on the iron ring (9);
5) Preparing a prefabricated double-row Y-shaped notched open-pore steel plate (3) according to the design size: the method comprises the steps of (1) carrying out partial cutting on Y-shaped notched perforated steel plates at regular intervals through an angle grinder, bending steel plates on two sides of the cut part in opposite directions for a certain angle, perforating at the center of each bent steel plate, and slotting to form notches;
6) Welding the prefabricated double-row Y-shaped notched perforated steel plate (3) on the I-steel beam (2), and welding the common steel plate (4) on two sides of the prefabricated double-row Y-shaped notched perforated steel plate (3) to form a whole;
Step two: the method for assembling and pouring the prefabricated steel-concrete composite girder bridge shearing-resistant connecting piece on site comprises the following specific steps:
1) Coating lubricating oil on the surfaces of a prefabricated double-row Y-shaped notched perforated steel plate (3) and a common steel plate (4) so as to eliminate the influence of friction on the shearing resistance of the connecting piece;
2) Hoisting the precast concrete deck (1) into position by a crane;
3) The two ends of each U-shaped penetrating steel bar (5) are hooked with the common steel bars (7) with the ends of the prefabricated bottom layer, and the other ends of the hooks (8) are bound with the common steel bars (6) with the ends of the prefabricated top layer by iron wires (10);
4) Pouring grouting material (11) in the shear groove of the precast concrete bridge deck (1).
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