CN114892499A - Prefabricated assembly type steel-concrete composite beam bridge shear connector and construction method - Google Patents
Prefabricated assembly type steel-concrete composite beam bridge shear connector and construction method Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 85
- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 217
- 239000010959 steel Substances 0.000 claims abstract description 217
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 20
- 229910052742 iron Inorganic materials 0.000 claims abstract description 19
- 238000010008 shearing Methods 0.000 claims abstract description 16
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 44
- 239000011178 precast concrete Substances 0.000 claims description 27
- 238000013461 design Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 9
- 239000011374 ultra-high-performance concrete Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 4
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 2
- 208000026817 47,XYY syndrome Diseases 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 7
- 230000002787 reinforcement Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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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
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling 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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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- 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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Abstract
The invention relates to a prefabricated assembly type steel-concrete composite beam bridge shear connector and a construction method, and belongs to the field of civil engineering steel-concrete composite beam bridges. The prefabricated concrete bridge deck slab mainly comprises a prefabricated concrete bridge deck slab, I-shaped steel beams, prefabricated double-row Y-shaped steel plates with slotted holes, ordinary steel plates, U-shaped penetrating steel bars, prefabricated top-layer end-piece ordinary steel bars, prefabricated bottom-layer end-piece ordinary steel bars, hooks, iron rings, iron wires and high-performance grouting materials; the prefabricated double Y-shaped slotted hole steel plate is welded on the I-shaped steel beam, the common steel plates are welded at two ends of the prefabricated double Y-shaped slotted hole steel plate, the prefabricated bottom-layer end-belt-end common steel bars are tightly hooked with the U-shaped through steel bars penetrating through the prefabricated double Y-shaped slotted hole steel plate through hooks, the prefabricated bottom-layer end-belt-end common steel bars are bound with the prefabricated top-layer end-belt-end common steel bars through iron wires, and finally grouting materials are poured in the shear grooves of the concrete bridge deck slab. The invention can fully ensure the effective transmission 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 assembly type steel-concrete composite beam bridge shear connector and a construction method, and belongs to the field of civil engineering steel-concrete composite beam bridges.
Background
With the rapid development of urbanization construction and the increasing demand of reconstruction and expansion, the concept of the bridge rapid construction technology (ABC) is more and more emphasized by the engineering community. The method has the advantages of improving the field constructability of the bridge structure, ensuring the material quality and the durability of the structure, reducing the influence of construction on the surrounding environment and the life of citizens, being more convenient and faster to maintain and replace in the later period, and the like.
The steel-concrete combined beam bridge is rapidly developed at home and abroad by virtue of the advantages of reasonable stress, good overall stability and local stability, convenient prefabrication construction, combination of concrete and steel, wide span application range, high benefit and the like, is widely applied to the field of bridges, and obtains remarkable economic benefit. In the existing steel-concrete composite beam bridge in China, most bridge decks adopt a mode of pouring concrete on site, the mode is large in pouring amount, the time required for maintenance is long, the construction period is greatly prolonged, the construction efficiency is reduced, and surrounding traffic and resident life are influenced. Therefore, it is necessary to introduce the prefabrication and assembly technology into the construction of the steel-concrete composite beam bridge, so that the construction progress can be accelerated, the labor cost can be reduced, and the overall quality of the steel-concrete composite beam bridge is improved.
In steel-concrete composite girder bridges, shear connectors are generally used to achieve synergy of several different materials or structures. The shear connector is the guarantee of the cooperative work of steel and concrete. Its main effects are two: the device is used for bearing and transmitting longitudinal shearing force between steel and concrete; and the second is used for resisting the lifting between the steel and the concrete. The shear connectors commonly used at present are a stud connector, a perforated plate connector and a profile steel connector. The stud connector has poor fatigue resistance and very weak drawing force. The perforated plate connecting piece has the problems that the through reinforcing steel bars are difficult to position and difficult to arrange. The steel connecting piece has weaker anti-drawing performance and is easy to separate steel from concrete. Each connection mode has the advantages and limitations in construction and stress performance. Under the action of long-term heavy traffic load and severe environment, the traditional steel-concrete composite beam bridge has the problems of poor durability, fast degradation of mechanical properties, easy cracking and the like, and becomes a problem which is urgently needed to be solved by the bridge engineering field.
Therefore, in order to accelerate the rapid construction of the steel-concrete composite beam bridge, the research on the shear connector which is reliable in connection, convenient and fast in construction and good in overall performance is the urgent task of the current steel-concrete composite bridge engineering construction, and therefore, the novel prefabricated assembly type steel-concrete composite beam bridge shear connector is provided, the high-performance grouting material is applied to the connection between the precast concrete bridge deck and the steel beam, the shear force transmission between the bridge deck and the steel beam is ensured, and the shear resistance and the fatigue resistance of the bridge deck and the steel beam are improved.
Disclosure of Invention
The invention provides a prefabricated steel-concrete composite beam bridge shear connector and a construction method thereof, aiming at solving the problems of poor durability, quick mechanical property degradation, easy cracking and the like of the traditional steel-concrete composite beam bridge, reducing the using amount of cast-in-place concrete and improving the mechanical property of the shear connector.
In order to solve the technical problems, the technical scheme adopted for realizing the invention is as follows:
a prefabricated assembly type steel-concrete composite beam bridge shear connector comprises an I-shaped steel beam and a prefabricated concrete bridge deck arranged on the I-shaped steel beam, wherein a shear groove is formed in the prefabricated concrete bridge deck; the shear groove is internally provided with a prefabricated double-row Y-shaped perforated steel plate with a groove opening, a common steel plate, a U-shaped through reinforcing steel bar, a prefabricated top-layer belt end common reinforcing steel bar, a prefabricated bottom-layer belt end common reinforcing steel bar, a hook, an iron ring and an iron wire, and grouting material is poured in the shear groove;
the prefabricated double-row Y-shaped steel plate with the slotted holes is welded on the I-shaped steel beam, and the common steel plates are welded on two sides of the prefabricated double-row Y-shaped steel plate with the slotted holes, so that the common steel plates and the prefabricated double-row Y-shaped steel plate with the slotted holes form a whole; the prefabricated double-row Y-shaped steel plate with the notch is composed of two identical Y-shaped steel plates with the notch, each Y-shaped steel plate with the notch is vertically and downwards cut at intervals from the top to form a plurality of sections of steel plates, two adjacent sections of steel plates are oppositely bent to form a certain angle, a hole is formed in each section of steel plate, and the notch is formed in the outer edge of each hole;
the U-shaped penetrating steel bar vertically penetrates through the center of the hole of the prefabricated double-row Y-shaped steel plate with the notch and is vertically downwards buckled on the prefabricated double-row Y-shaped steel plate with the notch;
the upper part and the lower part of the inner wall of the precast concrete bridge deck slab on the two sides of the shear groove are respectively provided with precast top layer strip end common steel bars and precast bottom layer strip end common steel bars;
the prefabricated bottom tape end ordinary steel bar is tight with the U-shaped hook for running through reinforcing bar bottom that passes prefabricated double Y shape groove notch trompil steel sheet, and the welding of the hook other end has the becket, has tied up the iron wire on the becket, and the ligature of the iron wire other end is on prefabricated top tape end ordinary steel bar for make prefabricated bottom tape end ordinary steel bar and U-shaped run through the reinforcing bar and bear the shear force jointly.
Furthermore, the prefabricated top layer strip end common steel bars and the prefabricated bottom layer strip end common steel bars in the prefabricated concrete bridge deck extend out of the inner wall of the shear groove of the prefabricated concrete bridge deck by a certain distance, and the extending distance of the prefabricated top layer strip end common steel bars is slightly smaller than the extending distance of the prefabricated bottom layer strip end common steel bars; the prefabricated top layer belt end common reinforcing steel bars and the prefabricated bottom layer belt end common reinforcing steel bars can improve the bonding strength and the integrity of the prefabricated concrete bridge deck and the rear pouring slurry.
Furthermore, two ends of the U-shaped through reinforcing steel bar are bent downwards to increase the area of a shear contact surface of the U-shaped through reinforcing steel bar, and the U-shaped through reinforcing steel bar is convenient to be connected with the common reinforcing steel bar at the end of the prefabricated bottom layer belt.
Furthermore, the diameter of the U-shaped through reinforcing steel bars is smaller than the diameter of the holes of the prefabricated double-row Y-shaped steel plate with the slotted holes and the width of the slotted holes.
Furthermore, a distance is reserved between the prefabricated double-row Y-shaped steel plate with the notch and two ends of the prefabricated concrete bridge deck along the bridge direction, so that the shearing resistance of the end part of the prefabricated double-row Y-shaped steel plate with the notch is exerted.
Furthermore, a small distance is reserved between the common steel bars at the ends of the prefabricated bottom layer and the prefabricated double-row Y-shaped perforated steel plates with the notches, and the prefabricated bottom layer and the prefabricated double-row Y-shaped perforated steel plates are prevented from colliding when the prefabricated concrete bridge deck slab is hoisted.
Further, the inner surface of the shear groove of the precast concrete deck slab 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 assembly type steel-concrete composite beam bridge shear connector comprises the following steps:
the method comprises the following steps: the method comprises the following steps of preparing prefabricated parts in a factory:
1) arranging longitudinal steel bars, prefabricated top layer belt end common steel bars and prefabricated bottom layer belt end common steel bars in a template of the prefabricated concrete bridge deck;
2) pouring concrete of the precast concrete bridge deck;
3) preparing an I-shaped steel beam, a common steel plate and a U-shaped through reinforcing steel bar 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 an iron wire with a certain length on the iron ring;
5) preparing a prefabricated double-row Y-shaped perforated steel plate with a slot according to the design size: performing partial cutting on a Y-shaped steel plate with a notch opening at intervals by an angle grinder, bending the steel plates on two sides of the cutting part in opposite directions by a certain angle, opening a hole in the center of each bent steel plate, and forming a notch;
6) welding the prefabricated double-row Y-shaped steel plate with the slotted holes on the I-shaped steel beam, and welding common steel plates on two sides of the prefabricated double-row Y-shaped steel plate with the slotted holes to form a whole;
step two: the on-site assembling and pouring prefabricated assembly type steel-concrete combined beam bridge shear connector comprises the following specific steps:
1) lubricating oil is smeared on the surfaces of the prefabricated double-row Y-shaped steel plate with the openings and the common steel plate to eliminate the influence of friction on the shearing resistance of the connecting piece;
2) hoisting the precast concrete bridge deck in place by using a crane;
3) the two end parts of each U-shaped penetrating steel bar are hooked with the common steel bar at the end of the prefabricated bottom layer belt by a hook, and the other end of the hook is bound with the common steel bar at the end of the prefabricated top layer belt by an iron wire;
4) and pouring grouting material in the shear groove of the precast concrete bridge deck.
Compared with the prior art, the invention has the following technical effects:
1. according to the invention, the shear grooves are reserved in the precast concrete bridge deck, and the high-performance grouting material or UHPC is poured in the shear grooves, so that compared with the full cast-in-place concrete bridge deck, the pouring amount 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 through reinforcing steel bars with the common reinforcing steel bars at the ends of the prefabricated strips, thereby not only playing the role of preventing concrete cracking of the reinforcing steel bars in the prefabricated bridge deck slab, but also playing the shear-resistant function, and improving the shear-resistant bearing capacity and ductility of the structure.
3. The perforated steel plate is bent at a certain angle at intervals, and compared with the traditional full-length arranged perforated steel plate shear connector, the perforated steel plate shear connector has the advantages that the end bearing effect of the perforated steel plate is better utilized, and the perforated steel plate shear connector has higher shear bearing capacity, initial rigidity and ductility.
4. The invention slots on the top of the Y-shaped steel plate with the slotted opening, so that the through steel bar can be directly vertically placed from the slot, and the position of the through steel bar can be accurately positioned. Compared with the traditional perforated steel plate shear connector, the perforated steel plate shear connector has the advantages of reducing perforation operation and reducing construction difficulty.
5. The invention relates to a shear connector with reliable connection, which can ensure that a combined section formed by a concrete bridge deck and a steel beam jointly resists the effect generated by the integral stress of a bridge and has higher shear bearing capacity and better ductility. The construction method not only can realize the construction without the support, has less cast-in-place engineering, accelerates the whole construction process, but also has good fatigue resistance.
Drawings
FIG. 1 is an overall view illustrating a shear connector for a prefabricated assembly type steel-concrete composite girder bridge;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a top view of a shear connector for a prefabricated assembly type steel-concrete composite girder bridge;
FIG. 5 is a schematic overall view of a prefabricated double row Y-shaped notched steel plate welded with a conventional steel plate;
FIG. 6 is a plan view of a hook with a hoop and wire;
FIG. 7 is a partial schematic view of the inside of a shear groove of a shear connector of a prefabricated steel-concrete composite beam bridge;
FIG. 8 is a schematic construction flow diagram of a prefabricated assembly type steel-concrete composite beam bridge shear connector;
in the figure, 1-precast concrete bridge deck slab, 2-I-shaped steel beam, 3-precast double-row Y-shaped steel plate with slotted holes, 4-common steel plate, 5-U-shaped through steel bar, 6-precast common steel bar with end at the top layer, 7-precast common steel bar with end at the bottom layer, 8-hook, 9-iron ring, 10-iron wire and 11-grouting material.
Detailed Description
The invention is described in detail below with reference to the examples and figures 1 to 8.
As shown in fig. 1 to 7, the shear connector for the prefabricated steel-concrete composite girder bridge according to the present invention includes an i-shaped steel beam 2 and a precast concrete deck 1 provided thereon, and a shear groove is provided in the precast concrete deck 1. Be provided with prefabricated double Y shape trough of belt mouth trompil steel sheet 3, ordinary steel sheet 4, U-shaped through reinforcement 5, prefabricated top layer area end ordinary reinforcement 6, prefabricated bottom layer area end ordinary reinforcement 7, crotch 8, hoop 9 and iron wire 10 in the shear force inslot, and the shear force inslot has pour grout material 11, and in this embodiment, grout material 11 is ultra high performance concrete UHPC.
The prefabricated double-row Y-shaped slotted hole steel plate 3 is welded on the I-shaped steel beam 2, and the common steel plates 4 are welded on two sides of the prefabricated double-row Y-shaped slotted hole steel plate 3, so that the common steel plates 4 and the prefabricated double-row Y-shaped slotted hole steel plate 3 form a whole. As shown in fig. 5, the prefabricated double-row Y-shaped steel plate with the perforated holes 3 is composed of two identical Y-shaped steel plates with perforated holes, each Y-shaped steel plate with perforated holes is vertically cut downwards at intervals from the top to form a plurality of steel plates, two adjacent steel plates are oppositely bent to form a certain angle, each 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 through steel bars 5 vertically pass through the center of the holes of the prefabricated double row Y-shaped steel plate with slotted holes 3 and are vertically buckled downwards on the prefabricated double row Y-shaped steel plate with slotted holes 3. The two ends of the U-shaped through reinforcing steel bar 5 are bent downwards to increase the area of the shear-resistant contact surface of the U-shaped through reinforcing steel bar and facilitate connection with the common reinforcing steel bar 7 at the end of the prefabricated bottom layer. The diameter of the U-shaped through reinforcing steel bars 5 is smaller than the hole diameter and the notch width of the prefabricated double-row Y-shaped steel plate 3 with the notch. The upper and lower parts 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 strip end common steel bars 6 and precast bottom layer strip end common steel bars 7. The common steel bars 6 at the prefabricated top layer belt end and the common steel bars 7 at the prefabricated bottom layer belt end in the prefabricated concrete bridge deck 1 extend out of the inner wall of the shear groove of the prefabricated concrete bridge deck 1 by a certain distance, and the extending distance of the common steel bars 6 at the prefabricated top layer belt end is slightly smaller than the extending distance of the common steel bars 7 at the prefabricated bottom layer belt end. The prefabricated top layer belt end common reinforcing steel bars 6 and the prefabricated bottom layer belt end common reinforcing steel bars 7 can increase the bonding strength and the integrity of the prefabricated concrete bridge deck 1 and the rear pouring slurry.
As shown in fig. 6-7, the prefabricated bottom layer end normal steel bar 7 is hooked with the bottom end of the U-shaped through steel bar 5 passing through the prefabricated double-row Y-shaped steel plate with the slot opening 3 by a hook 8, 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 end normal steel bar 6 and used for enabling the prefabricated bottom layer end normal steel bar 7 and the U-shaped through steel bar 5 to bear shearing force together.
In this embodiment, a distance is reserved between the prefabricated double-row Y-shaped steel plate with the slot opening 3 and the two ends of the prefabricated concrete bridge deck 1 along the bridge direction, so as to exert the shear resistance of the end part of the prefabricated double-row Y-shaped steel plate with the slot opening 3. A small distance is reserved between the common steel bars 7 at the end of the prefabricated bottom layer and the prefabricated double-row Y-shaped perforated steel plate 3 with the slot, and the prefabricated bottom layer are prevented from colliding when the prefabricated concrete bridge deck plate 1 is hoisted. The inner surface of the shear groove of the precast concrete deck slab 1 is roughened so that sufficient shear strength is provided between the precast concrete and the grouting material.
The principle is as follows: when the steel-concrete composite beam bridge normally works, the novel prefabricated steel-concrete composite beam bridge shear connector can prevent the horizontal separation and the vertical separation of the steel beam and the concrete bridge deck, and can ensure the cooperative deformation between the steel beam and the precast concrete bridge deck 1 by transferring the shearing force between the two. In addition, during the use of the steel-concrete composite girder, the steel girder and the precast concrete deck slab 1 are relatively slid, thereby generating a shearing force at the interface. The invention mainly provides the anti-shearing capability by a prefabricated double-row Y-shaped steel plate 3 with a notch, a common steel plate 4 and a U-shaped through reinforcing steel bar 5. The bent steel plates of the prefabricated double-row Y-shaped steel plate with the notch and the hole can play a role in shearing resistance of the end part, a concrete tenon can be formed between the two steel plates bent in different directions, and meanwhile, the concrete tenon can be formed at the position of the notch and the hole, so that the excellent shearing resistance of the steel plates can be exerted. The common steel plate 4 can improve the overall shear rigidity of the shear connector. U-shaped through reinforcement 5 passes through crotch 8 and iron wire 10 and prefabricated top layer area end ordinary reinforcement 6 and prefabricated bottom layer area end ordinary reinforcement 7 ligature, forms a whole. Under the action of shearing force, the U-shaped through steel bars 5, the prefabricated top layer belt end common steel bars 6 and the prefabricated bottom layer belt end common steel bars 7 work in a cooperation mode to jointly exert the shearing resistance. When the steel beam and the concrete bridge deck slab slide relatively, the concrete tenon in the double-row Y-shaped steel plate with the notch opening 3 exerts the shear resistance firstly, when the strength of the concrete tenon is insufficient, the concrete tenon can be cut or crushed by the double-row Y-shaped steel plate with the notch opening 3, at the moment, the U-shaped through steel bars 5, the prefabricated top-layer strip-end common steel bars 6 and the prefabricated bottom-layer strip-end common steel bars 7 exert the shear resistance, and when the load continues to increase, the U-shaped through steel bars 5 gradually enter the yield state and finally are expressed as the bending shear damage of the U-shaped through steel bars 5.
As shown in fig. 8, the construction method of the shear connector for the prefabricated assembly type steel-concrete composite girder bridge includes the following steps:
the method comprises the following steps: the method comprises the following steps of preparing prefabricated parts in a factory:
1) longitudinal steel bars, prefabricated top layer strip end common steel bars 6 and prefabricated bottom layer strip end common steel bars 7 are arranged in a template of the prefabricated concrete bridge deck slab 1.
2) And pouring concrete of the precast concrete bridge deck 1.
3) And manufacturing an I-shaped steel beam 2, a common steel plate 4 and a U-shaped through reinforcement 5 according to the design size.
4) A hook 8 and an iron ring 9 are prepared according to the design size, the iron ring 9 is welded at the tail end of the hook 8, and an iron wire 10 with a certain length is wound on the iron ring 9.
5) Preparing a prefabricated double-row Y-shaped perforated steel plate with a slot opening according to the design size 3: the method comprises the steps of performing partial cutting on a Y-shaped steel plate with a notch at intervals by an angle grinder, bending the steel plates on two sides of the cutting part at a certain angle in opposite directions, punching at the center of each bent steel plate, and forming the notch.
6) Welding the prefabricated double-row Y-shaped perforated steel plate 3 with the slot on the I-shaped steel beam 2, and welding the common steel plates 4 on two sides of the prefabricated double-row Y-shaped perforated steel plate 3 with the slot to form a whole.
Step two: the on-site assembling and pouring prefabricated assembly type steel-concrete combined beam bridge shear connector comprises the following specific steps:
1) lubricating oil is smeared on the surfaces of the prefabricated double-row Y-shaped steel plate 3 with the openings and the common steel plate 4 to eliminate the influence of friction on the shearing resistance of the connecting piece.
2) And hoisting the precast concrete bridge deck 1 in place by using a crane.
3) The two ends of each U-shaped through reinforcing steel bar 5 are hooked tightly with the common reinforcing steel bars 7 at the end of the prefabricated bottom layer belt by using hooks 8, and the other ends of the hooks 8 are bound with the common reinforcing steel bars 7 at the end of the prefabricated top layer belt by using iron wires 10.
4) And pouring grouting materials 11 in the shear grooves of the precast concrete bridge deck 1.
The present invention has been described in detail, but the content of the disclosure should not be construed as limiting the scope of the invention, and all modifications made in the scope of the present invention, such as the shape and size of the shear connector, the type of the through-steel, the manner of binding the through-steel with the prefabricated general-steel, the manner of connecting the prefabricated concrete deck and the post-cast section, etc., should fall within the scope of the present invention.
Claims (9)
1. The utility model provides a prefabricated assembled steel-concrete combination beam bridge shear connector, its includes I-steel roof beam (2) and precast concrete decking (1) that sets up on it, its characterized in that:
a shear groove is formed in the precast concrete bridge deck (1); the shear groove is internally provided with a prefabricated double-row Y-shaped perforated steel plate (3) with a groove opening, a common steel plate (4), a U-shaped through reinforcing steel bar (5), a prefabricated top-layer common reinforcing steel bar with an end (6), a prefabricated bottom-layer common reinforcing steel bar with an end (7), a hook (8), an iron ring (9) and an iron wire (10), and grouting material (11) is poured in the shear groove;
the prefabricated double-row Y-shaped steel plate with the notch is welded on the I-shaped steel beam (2), and the common steel plates (4) are welded on two sides of the prefabricated double-row Y-shaped steel plate with the notch (3), so that the common steel plates (4) and the prefabricated double-row Y-shaped steel plate with the notch (3) form a whole; the prefabricated double-row Y-shaped steel plate (3) with the notch is composed of two identical Y-shaped steel plates with the notch, each Y-shaped steel plate with the notch is vertically and downwards cut at intervals from the top 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 the hole is provided with a notch;
the U-shaped through reinforcing steel bars (5) vertically penetrate through the center of the holes of the prefabricated double-row Y-shaped steel plate with the slotted openings (3) and are vertically downwards buckled on the prefabricated double-row Y-shaped steel plate with the slotted openings (3);
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 end heads and precast bottom layer common reinforcing steel bars (7) with end heads;
the prefabricated bottom layer belt end common reinforcing steel bars (7) are tightly hooked with a U-shaped through reinforcing steel bar (5) bottom end through a prefabricated double-row Y-shaped perforated steel plate (3), an iron ring (9) is welded to the other end of the hook (8), an iron wire (10) is tied on the iron ring (9), and the other end of the iron wire (10) is tied on a prefabricated top layer belt end common reinforcing steel bar (6) and used for enabling the prefabricated bottom layer belt end common reinforcing steel bars (7) and the U-shaped through reinforcing steel bar (5) to bear shearing force jointly.
2. The precast assembled steel-concrete composite girder bridge shear connector according to claim 1, wherein: the prefabricated top layer strip end common steel bars (6) and the prefabricated bottom layer strip end common steel bars (7) in the prefabricated concrete bridge deck (1) extend out of the inner wall of a shear groove of the prefabricated concrete bridge deck (1) for a certain distance, and the extending distance of the prefabricated top layer strip end common steel bars (6) is slightly smaller than the extending distance of the prefabricated bottom layer strip end common steel bars (7); the prefabricated top layer belt end common reinforcing steel bars (6) and the prefabricated bottom layer belt end common reinforcing steel bars (7) can increase the bonding strength and the integrity of the prefabricated concrete bridge deck (1) and the rear pouring slurry.
3. The precast assembled steel-concrete composite girder bridge shear connector according to claim 1, wherein: the two ends of the U-shaped through reinforcing steel bar (5) are bent downwards to increase the area of a shear contact surface of the U-shaped through reinforcing steel bar, and the U-shaped through reinforcing steel bar is convenient to connect with a common reinforcing steel bar (7) at the end of the prefabricated bottom layer.
4. The precast assembled steel-concrete composite girder bridge shear connector according to claim 1, wherein: the diameter of the U-shaped through reinforcing steel bars (5) is smaller than the hole diameter and the notch width of the prefabricated double-row Y-shaped steel plate (3) with the notch.
5. The precast assembled steel-concrete composite girder bridge shear connector according to claim 1, wherein: the prefabricated double-row Y-shaped steel plate with the notch and the hole (3) is reserved with a distance from two ends of the prefabricated concrete bridge deck (1) along the bridge direction so as to exert the shear resistance of the end part of the prefabricated double-row Y-shaped steel plate with the notch and the hole (3).
6. The precast assembled steel-concrete composite girder bridge shear connector according to claim 1, wherein: a small distance is reserved between the common steel bars (7) at the ends of the prefabricated bottom layer and the prefabricated double-row Y-shaped slotted open-hole steel plates (3), and the prefabricated bottom layer are prevented from colliding when the prefabricated bottom layer and the prefabricated bottom layer are hoisted on the prefabricated concrete bridge deck slab (1).
7. The precast assembled steel-concrete composite girder bridge shear connector according to claim 1, wherein: the inner surface of the shear groove of the precast concrete bridge deck (1) is roughened so that sufficient shear strength exists between precast concrete and grouting material.
8. The precast assembled steel-concrete composite girder bridge shear connector according to claim 1, wherein: the grouting material (11) is ultra high performance concrete UHPC.
9. A construction method for a prefabricated assembly type steel-concrete composite girder bridge shear connector according to claims 1 to 8, comprising the steps of:
the method comprises the following steps: the method comprises the following steps of preparing prefabricated parts in a factory:
1) arranging longitudinal steel bars, prefabricated top layer strip end common steel bars (6) and prefabricated bottom layer strip end common steel bars (7) in a template of the prefabricated concrete bridge deck (1);
2) pouring concrete of the precast concrete bridge deck (1);
3) preparing an I-shaped steel beam (2), a common steel plate (4) and a U-shaped through reinforcing steel bar (5) according to the design size;
4) preparing a hook (8) and an iron ring (9) according to the design 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 perforated steel plate (3) with a slot opening according to the design size: performing partial cutting on a Y-shaped steel plate with a notch opening at intervals by an angle grinder, bending the steel plates on two sides of the cutting part in opposite directions by a certain angle, opening a hole in the center of each bent steel plate, and forming a notch;
6) welding prefabricated double-row Y-shaped steel plates (3) with notches and holes on the I-shaped steel beams (2), and welding common steel plates (4) on two sides of the prefabricated double-row Y-shaped steel plates (3) with notches and holes to form a whole in an enclosing mode;
step two: the on-site assembling and pouring prefabricated assembly type steel-concrete combined beam bridge shear connector comprises the following specific steps:
1) lubricating oil is smeared on the surfaces of the prefabricated double-row Y-shaped steel plate (3) with the notches and the 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 bridge deck (1) in place by using a crane;
3) the two end parts of each U-shaped penetrating steel bar (5) are hooked tightly with the common steel bar (7) at the end of the prefabricated bottom layer belt by a hook (8), and the other end of the hook (8) is bound with the common steel bar (7) at the end of the prefabricated top layer belt by an iron wire (10);
4) and pouring grouting material (11) in the shear groove of the precast concrete bridge deck (1).
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