CN212270679U - Novel anti-drawing composite beam joint structure - Google Patents
Novel anti-drawing composite beam joint structure Download PDFInfo
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- CN212270679U CN212270679U CN202020372090.8U CN202020372090U CN212270679U CN 212270679 U CN212270679 U CN 212270679U CN 202020372090 U CN202020372090 U CN 202020372090U CN 212270679 U CN212270679 U CN 212270679U
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Abstract
A novel anti-pulling composite beam joint structure is characterized in that a stud shear key is arranged on the upper surface of the upper flange of a steel beam, a concrete plate is arranged on the steel beam, the steel beam is a support of the concrete plate, a plurality of embedded part plates are arranged on the connecting edge of the concrete plate, the embedded part plates are divided into an embedded part, an exposed part and an extended connecting tensile pulling head, and the embedded part is positioned in the concrete plate; stress reinforcing steel bar holes are formed in the embedded parts of the embedded part plates, and the positions of the stress reinforcing steel bar holes correspond to the positions of stress reinforcing steel bars in the concrete plates; connecting reinforcing steel bar holes are formed in the exposed parts of the embedded part plates, and the sizes of the connecting reinforcing steel bar holes need to correspond to the connecting reinforcing steel bars; a U-shaped opening is formed between the concrete slab and the steel beam, and polymer mortar is filled into the U-shaped opening. The invention improves the integral stress performance of the combined beam bridge, the tightness between the upper flange of the steel beam and the concrete, the vertical shearing resistance and durability between new and old concrete, the pulling resistance and shearing resistance between steel and concrete and the bearing capacity of a joint at a manufacturing position.
Description
Technical Field
The utility model belongs to the technical field of bridge engineering and building structure engineering's thin part and structure and construction and specifically relates to a novel combination beam seam structure is pulled out to tensile.
Background
In recent years, with the development of economy in China, the country pays more and more attention to the research, development and popularization of a combined structure. In order to reduce the hoisting weight of the prefabricated steel-concrete composite beam and facilitate transportation, the assembled steel-concrete composite beam bridge is provided with joints at adjacent main beams, and the joints are poured to form a whole after the prefabricated parts are assembled. During bridge operations, wet joints are one of the most vulnerable sites for precast concrete deck panels. The wet joint is mainly composed of steel members and concrete, and the steel members and the concrete share the effect of various internal forces on the wet joint. The wet joint concrete is used as a main structure part of a bridge deck system and bears heavy bridge deck traffic load, the service life of the wet joint concrete has great influence on the normal operation of the bridge, and from the current situation of the bridge which is put into operation at present, the wet joint cracks to form a common phenomenon, most of wet joints at the bridge work with joints, and even more, after the wet joint concrete of a plurality of highway bridges is poured, the water seepage phenomenon of different degrees occurs in the maintenance period, and the phenomenon is more serious particularly after rain, so that the adverse effect is generated on the internal structure of the bridge and the durability of the bridge is reduced; in the traditional joint process, concrete with the same mark number is filled between butted concrete slabs, and the precast steel bars and the concrete bear force together, generally, the shearing force and the hogging moment of new and old concrete at the joint are often larger, and the new and old concrete is easy to peel off from each other under the action of reciprocating load for a long time; according to the traditional joint process, protective measures are not always arranged at joint sections, under the action of vehicle load, the upper part and the lower part of the joint at the upper part of a steel beam respond to the action of reciprocating compressive load, the prefabricated steel bars are bent in the inner surface and the outer surface, so that the local crushing phenomenon occurs, the damage can cause fatal influence on the normal service of the steel-concrete composite beam, and the durability of the bridge cannot be ensured; when the composite beam bears torque or bears local load or support negative bending moment, cracks are easy to appear between new and old concrete, when the concrete slab is laid for a short length, under the action of pressure load, one end of the concrete slab, which is close to the upper flange of the steel beam, is easy to appear vertical shear cracks or even shear failure, the durability and the safety of the structure can be greatly reduced, under the action of the negative bending moment and the torque, the concrete slab above the steel beam has larger vertical drawing force, at the moment, the vertical friction force between the shearing resistant part and the concrete slab does not pay attention to resisting the vertical drawing force, the new and old concrete can generate vertical cracks under the action of the vertical drawing force, even the phenomenon that the new concrete is pulled away is generated, under the action of combined shearing force, the joint structure part is often under the action of complex stress, and has great potential safety hazard; in the 'design specification of steel-concrete composite bridges GB 50917-2013' of China, measures are clearly specified to enable prefabricated plates and steel beams to be closely attached to meet waterproof requirements when prefabricated reinforced concrete bridge decks are used as bridge decks, and in the 'design and construction specification of road steel-concrete composite bridges JTG/T D64-01-2015' of the durability of steel-concrete contact surfaces, the 'contact surface separation prevention from aspects of concrete configuration, structural requirements, construction process and the like' is also specified in the 'design of steel-concrete composite bridges and the construction specification JTG/T D64-01-2015', but the joint in the traditional process cannot meet the requirement of tightness and no separation between the steel beams and the concrete slabs under the action of reciprocating loads. The quantity of bridges which are built and put into use in China every year is large, and accounts for more than half of the quantity of newly-built bridges in the world every year, so that the quality and durability of the bridges are improved, the life cycle cost is reduced, the construction of steel structure bridges is promoted, and the transformation upgrading, quality improvement and efficiency improvement of highway construction are promoted, which is the trend of the current bridge construction development.
Disclosure of Invention
In order to overcome prior art's not enough, the utility model provides a novel combination beam seam structure is pulled out to tensile, it has improved the structural style of traditional seam crossing, can improve the whole atress performance of combination beam bridge, the compactness between girder steel top flange and the concrete, vertical shear resistance and durability between new and old concrete, the tensile between steel and the concrete is pulled out performance and shear resistance and the bearing capacity of preparation department seam, make girder steel and concrete slab constitute an organic whole, can be applied to in the connection process of various combination beam bridges.
The technical proposal adopted by the utility model for solving the technical problems is that;
the joint structure comprises a concrete slab, a steel beam, a pre-embedded plate, an overhanging connecting tensile pull head, a stud shear key, a connecting steel bar hole, a stressed steel bar hole and polymer mortar, wherein the stud shear key is arranged on the upper surface of the upper flange of the steel beam, the concrete slab is arranged on the steel beam, the steel beam is a support of the concrete slab, a plurality of pre-embedded part plates are arranged on the connecting edge of the concrete slab, the pre-embedded plate is divided into a pre-embedded part, an exposed part and an overhanging connecting tensile pull head, and the pre-embedded part is positioned inside the concrete slab; the pre-buried part of the pre-buried part plate is provided with the stressed reinforcing steel bar hole, and the position of the stressed reinforcing steel bar hole corresponds to the position of a stressed reinforcing steel bar in the concrete plate; arranging the connecting reinforcing steel bar holes on the exposed parts of the embedded part plates, wherein the size of the connecting reinforcing steel bar holes needs to correspond to that of the connecting reinforcing steel bars; and forming a U-shaped opening between the concrete slab and the steel beam, and filling the polymer mortar into the U-shaped opening.
Furthermore, the steel beam and the stud shear key are made of weathering resistant steel, and the stud shear key is welded on the upper surface of the upper flange of the steel beam through a welding process.
Still further, during installation, the concrete slab rests on the steel beam, forming a U-shaped opening with the steel beam.
Furthermore, when a reinforcement cage in the concrete slab is bound, the embedded plate is connected to the reinforcement cage through the stressed reinforcement hole, and the stressed reinforcement and the embedded plate are welded and fixed; or the embedded part of the embedded part plate is directly connected to the steel bar in the concrete slab in a welding mode.
Preferably, the exposed parts of the embedded plates on the connecting edges of the two butted concrete plates are required to be distributed in a staggered manner.
The connecting reinforcing steel bar holes and the stressed reinforcing steel bar holes are at least arranged in two rows and two columns, so that the joint structure is more stable, and the stress performance is better.
Further, the distance between the overhanging connecting tensile drawing head and the exposed part is 0.1-0.5 mm larger than the thickness of the upper flange of the steel beam.
Preferentially, the lower left corner of the extending connection tensile pull head is made into a round corner, so that water is not easy to accumulate, and the repair is also convenient.
Preferentially, the upper right corner of the overhanging connecting tensile pulling head is made into a circular inner chamfer or a right-angle chamfer, so that the problem of installation caused by the superposition of welding seams between the upper flange of the steel beam and the web plate is avoided.
Preferably, the surface of the overhanging joint tensile puller is subjected to strict surface treatment, rust removal and oil removal, sand blasting treatment is required for the surface, and an anti-corrosion and fireproof coating is brushed on the surface.
Furthermore, the upper side edge and the side edge of the overhanging connection tensile pull head are subjected to groove processing preferentially, the overhanging connection tensile pull head is connected with the upper flange and the web of the steel beam by adopting full penetration welding, the quality of a welding line needs to reach more than a second-level welding line, and the welding line is subjected to corrosion prevention and fire prevention processes.
Further, when the concrete slabs are erected on the steel beam, the connection reinforcing steel bar holes on the exposed parts of the embedded plates on the two concrete slabs are ensured to be aligned one by one, error control is well conducted, and then the connection reinforcing steel bars penetrate through the connection reinforcing steel bar holes one by one, so that the two concrete slabs are connected.
The connecting reinforcing steel bars are preferably high-strength reinforcing steel bars, and the grade of the connecting reinforcing steel bars is higher than that of the stressed reinforcing steel bars in the concrete slab.
Epoxy mortar is preferably used as the polymer mortar.
The beneficial effects of the utility model are that:
(1) the embedded plates and the connecting steel bars are arranged at the joints between the concrete slabs, so that the connection between the concrete slabs is tighter, the joints are not weak links under the action of dynamic load, and the epoxy mortar and the precast slabs at the joints are effectively connected by matching with the super-strong compression resistance, shear resistance, deformation coordination capacity and peeling resistance of the polymer mortar, so that the cracking condition of the joints of new and old blocks under the action of external load can be prevented.
(2) The concrete is tightly connected with the upper flange and the web plate of the steel beam through the externally extending connecting tensile pull head on the embedded part, so that the concrete can provide larger shear resistance for the joint of the combined beam and resist external shear force together by matching with a stud shear key;
(3) the concrete is tightly connected with the upper flange and the web plate of the steel beam through the overhanging connection tensile pull head on the embedded part, so that the drawing action of the concrete plate under the action of negative bending moment and torque load can be prevented, and the polymer mortar layer is tightly connected with the exposed part of the embedded plate, so that the phenomena of cracking, bulging and the like under the action of negative bending moment and torque between new and old concrete are prevented;
(4) the overhanging connecting tensile head is tightly connected with the upper flange and the web plate of the steel beam, and the phenomenon of void between the upper flange of the steel beam and the concrete slab does not occur under the condition of complex stress of a joint structure;
(5) polymer mortar is poured, and the overhanging connecting tensile pull head is matched with the steel beam upper flange and the web plate to be tightly connected, so that the longitudinal shear resistance between the prefabricated plates can be improved, relative sliding between the prefabricated plates is prevented, and the structure is more stable.
Drawings
Fig. 1 is a front schematic view of a novel anti-drawing composite beam joint structure and a manufacturing process thereof.
3 fig. 32 3 is 3 a 3 sectional 3 view 3 of 3 a 3 novel 3 anti 3- 3 drawing 3 composite 3 beam 3 joint 3 structure 3 and 3 a 3 manufacturing 3 process 3 thereof 3. 3
Fig. 3 is a B-B sectional view of a novel anti-drawing composite beam joint structure and a manufacturing process thereof.
FIG. 4 is a C-C sectional view of a novel anti-drawing composite beam joint structure and a manufacturing process thereof.
Fig. 5 is a detailed view of a novel anti-drawing composite beam joint structure and a pre-embedded plate 3 in the manufacturing process.
Fig. 6 is an exploded view of a novel anti-drawing composite beam joint structure and a manufacturing process thereof.
In the drawings, 1 is a concrete slab; 2 is a steel beam; 3, pre-buried plate; 31 extending connecting tensile pull heads; 32 is an exposed portion; 33 is a pre-buried part; 4 is a stud shear key; 5 is connecting steel bar; 51 is a connecting reinforcing steel bar hole; 6 is a stressed steel bar; 61 is a stressed reinforcing steel bar hole; and 7 is polymer mortar.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 6, a novel anti-pulling composite beam joint structure comprises a concrete slab 1, a steel beam 2, an embedded plate 3, an outward extending connecting tensile pull head 31, a stud shear key 4, a connecting steel bar 5, a connecting steel bar hole 51, a stressed steel bar 6, a stressed steel bar hole 61 and polymer mortar 7.
The upper surface of the upper flange of the steel beam 2 is provided with a stud shear key 4; the steel beam 2 and the stud shear keys 4 are made of weathering resistant steel, and the stud shear keys 4 are welded on the upper surface of the upper flange of the steel beam 2 through a welding process; the concrete slab 1 is arranged on the steel beam 2, and the steel beam 2 is a support of the concrete slab 1; in the installation process, the concrete slab 1 is placed on the steel beam 2, and a U-shaped opening is formed between the concrete slab and the steel beam 2; the connecting edge of the concrete slab 1 is provided with a plurality of embedded part plates 3, the embedded part plates 3 are divided into embedded parts and exposed parts, and the embedded parts are positioned in the concrete slab 1; stress reinforcing steel bar holes 61 are formed in the embedded parts of the embedded part plates 3, the positions of the stress reinforcing steel bar holes 61 correspond to the positions of stress reinforcing steel bars 6 in the concrete slab, when a reinforcement cage in the concrete slab 1 is bound, the embedded part plates 3 are connected to the reinforcement cage through the stress reinforcing steel bar holes 6, the stress reinforcing steel bars 6 and the embedded part plates 3 are welded and fixed, and the embedded parts of the embedded part plates 3 can also be directly connected to reinforcing steel bars in the concrete slab 1 in a welding mode; the embedded plates 3 on the connecting edges of the two butted concrete slabs 1 need to be distributed in a staggered manner; connecting reinforcing steel bar holes 51 are formed in the exposed parts of the embedded part plates 3, and the size of each connecting reinforcing steel bar hole 51 needs to correspond to that of each connecting reinforcing steel bar 5; the connecting reinforcing steel bar holes 51 and the stress reinforcing steel bar holes 61 are at least arranged in two rows, so that the joint structure is more stable, and the stress performance is better; the distance between the overhanging connecting tensile head 31 and the exposed part 32 is 0.1 to 0.5mm larger than the thickness of the upper flange of the steel beam 2; the left lower corner of the extending connection tensile pull head 31 is made into a round corner, so that water accumulation is not easy to happen, and repair is convenient; the upper right corner of the overhanging connecting tensile drawing head 31 is made into a round inner chamfer or a right-angle chamfer, so that the problem of installation caused by superposition with a welding seam between the upper flange and the web of the steel beam 2 is avoided; the surface of the overhanging connected tensile drawing head 31 is strictly subjected to surface treatment, rust removal and oil removal, sand blasting treatment is required to be carried out on the surface, and an anti-corrosion and fireproof coating is brushed on the surface; the upper side of the overhanging connected tensile pulling head 31 and the side have the preferential groove treatment, the upper flange and the web of the overhanging connected tensile pulling head 31 and the steel beam 2 adopt full penetration welding to be connected, the welding seam quality needs to reach more than a second-level welding seam, and the welding seam adopts anticorrosion and fireproof processes.
When the concrete slabs 1 are erected on the steel beam 2, the connection reinforcing steel bar holes 51 on the exposed parts of the embedded plates 3 on the two concrete slabs 1 are ensured to be aligned one by one, error control is well carried out, and then the connection reinforcing steel bars 5 penetrate through the connection reinforcing steel bar holes 51 one by one, so that the two concrete slabs 1 form a connection relation; the connecting steel bars 5 preferably adopt high-strength steel bars, and the grade of the connecting steel bars 5 is higher than that of the stressed steel bars 6 in the concrete slab; when the structure is erected, a U-shaped opening is formed between the concrete slab 1 and the steel beam 2, and polymer mortar 7 is filled into the U-shaped opening; epoxy mortar is preferably used as the polymer mortar 7.
The manufacturing process of the novel anti-drawing composite beam joint structure comprises the following steps:
1) preparing concrete materials, steel bars and steel materials for manufacturing the concrete slabs 1 and the steel beams 2;
2) manufacturing the embedded plate 3, and arranging the connecting reinforcing steel bar holes 51 and the stressed reinforcing steel bar holes 61 on the embedded plate 3, wherein the embedded plate comprises the embedded part 33, the exposed part 32 and the overhanging connecting tensile pull head 31, and the embedded plate 3 is in a U shape;
3) performing a beveling process on the upper side and the right side of the overhanging connecting tensile head 31 according to the Steel Structure design Specification GB50017-2017, and then performing a rust removal and oil removal process on the surface of the overhanging connecting tensile head 31;
4) binding the reinforcing steel bars of the concrete slab 1, wherein in the binding process, the embedded plate 3 penetrates through the stressed reinforcing steel bar 6 through the stressed reinforcing steel bar hole 61 arranged on the embedded plate, and is fixed by adopting a welding process, so that the accurate position of the embedded plate 3 is ensured;
5) pouring concrete to form the concrete slab 1 with the embedded plate 3, maintaining for 28 days, and ensuring that the distance between the overhanging connecting tensile drawing head 31 and the lower surface of the concrete slab 1 is the thickness of the upper flange of the steel beam 2, wherein the error cannot be larger than 0.5 mm;
6) welding the stud shear keys 4 on the upper surfaces of the upper flanges of the steel beams 2 to form the steel beams 2 with the stud shear keys 4, performing derusting and deoiling processes on the surfaces of the steel beams 2 and the shear keys 4, and performing sand blasting or red rust generating processes on the surfaces of the upper flanges of the steel beams 2 and the shear keys 4;
7) transporting the steel beam 2 with the stud shear keys 4 to a construction site for installation;
8) transporting the concrete slab 1 with the embedded plates 3 to a construction site for installation, and placing the concrete slab 1 with the embedded plates 3 on the top flange of the steel beam 2 with the stud shear keys 4 to ensure that the top flange of the steel beam 2 is positioned between the bottom surface of the concrete slab 1 and all the overhanging connecting tensile heads 31;
9) respectively carrying out full penetration T-shaped butt welding on the upper edge and the right edge of the overhanging connecting tensile drawing head 31 and the upper flange and the web plate of the steel beam 2, so that the concrete slab 1 and the steel beam 2 are initially formed into a whole;
10) pouring polymer mortar 7 into a U-shaped opening formed between the steel beam 2 with the stud shear key 4 and the concrete slab 1 with the embedded plate 3;
11) and (5) after solidification, forming a novel anti-drawing composite beam joint structure.
Claims (10)
1. The novel anti-pulling composite beam joint structure is characterized by comprising a concrete slab, a steel beam, embedded plates, an externally-extending connecting tensile pulling head, a stud shear key, connecting steel bars, connecting steel bar holes, stressed steel bars, stressed steel bar holes and polymer mortar, wherein the stud shear key is arranged on the upper surface of the upper flange of the steel beam, the concrete slab is arranged on the steel beam, the steel beam is a support of the concrete slab, a plurality of embedded plates are arranged on the connecting side of the concrete slab, the embedded plates are divided into embedded parts, exposed parts and the externally-extending connecting tensile pulling head, and the embedded parts are positioned in the concrete slab; the pre-buried part of the pre-buried plate is provided with the stressed steel bar hole, and the position of the stressed steel bar hole corresponds to the position of a stressed steel bar in the concrete slab; arranging the connecting reinforcing steel bar holes on the exposed parts of the embedded plates, wherein the size of the connecting reinforcing steel bar holes is required to correspond to that of the connecting reinforcing steel bars; and forming a U-shaped opening between the concrete slab and the steel beam, and filling the polymer mortar into the U-shaped opening.
2. The novel anti-drawing composite beam joint structure as claimed in claim 1, wherein the steel beam and the stud shear key are made of weathering steel, and the stud shear key is welded to the upper surface of the upper flange of the steel beam through a welding process.
3. A novel tensile composite beam joint structure according to claim 1 or 2, wherein during installation, said concrete slab rests on said steel beam, forming a U-shaped opening with said steel beam.
4. The novel anti-drawing composite beam joint structure as claimed in claim 1 or 2, wherein when a reinforcement cage in the concrete slab is bound, the pre-buried plate is connected to the reinforcement cage through the stressed reinforcement hole, and the stressed reinforcement and the pre-buried plate are welded and fixed; or the embedded part of the embedded plate is directly connected to the steel bar in the concrete slab in a welding mode.
5. A novel anti-drawing composite beam joint structure as claimed in claim 1 or 2, characterized in that the exposed parts of the embedded plates on the connecting edges of two butted concrete slabs need to be distributed in a staggered way.
6. A novel anti-drawing composite beam joint structure as claimed in claim 1 or 2, wherein said connecting reinforcement holes and said stressed reinforcement holes are arranged in at least two rows and two columns.
7. The novel tensile composite beam joint structure of claim 5, wherein the distance between the overhanging connecting tensile head and the exposed part is 0.1 to 0.5mm larger than the thickness of the upper flange of the steel beam.
8. A novel tensile composite beam joint structure according to claim 1 or 2, wherein the left lower corner of the overhanging connecting tensile head is made into a round corner; the upper right corner of the overhanging connecting tensile drawing head is made into a round inner chamfer or a right-angle chamfer, the surface of the overhanging connecting tensile drawing head is subjected to strict surface treatment, rust removal and oil removal, sand blasting treatment is required to be carried out on the surface, and an anti-corrosion and fireproof coating is brushed on the surface; the upper side edge and the side edge of the overhanging connection tensile pull head are subjected to groove treatment preferentially, the overhanging connection tensile pull head is connected with the upper flange and the web of the steel beam by adopting full penetration welding, the quality of a welding line needs to reach more than a second-level welding line, and the welding line is subjected to corrosion prevention and fire prevention processes.
9. A novel anti-drawing composite beam joint structure according to claim 1 or 2, characterized in that the connecting steel bars are high-strength steel bars, and the grade of the connecting steel bars is higher than that of the stressed steel bars in the concrete slab.
10. A novel tensile composite beam joint structure according to claim 1 or 2, wherein said polymer mortar is preferably epoxy mortar.
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| CN202020372090.8U CN212270679U (en) | 2020-03-23 | 2020-03-23 | Novel anti-drawing composite beam joint structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529566A (en) * | 2021-06-23 | 2021-10-22 | 浙江交通职业技术学院 | Assembled steel-concrete composite beam joint structure with higher integrity and manufacturing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529566A (en) * | 2021-06-23 | 2021-10-22 | 浙江交通职业技术学院 | Assembled steel-concrete composite beam joint structure with higher integrity and manufacturing method |
| CN113529566B (en) * | 2021-06-23 | 2022-11-15 | 浙江交通职业技术学院 | Assembled steel-concrete composite beam joint structure with higher integrity and manufacturing method |
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