CN110528778B - Novel tensile shear steel-concrete composite beam structure and manufacturing process thereof - Google Patents
Novel tensile shear steel-concrete composite beam structure and manufacturing process thereof Download PDFInfo
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- CN110528778B CN110528778B CN201910878578.XA CN201910878578A CN110528778B CN 110528778 B CN110528778 B CN 110528778B CN 201910878578 A CN201910878578 A CN 201910878578A CN 110528778 B CN110528778 B CN 110528778B
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- 239000004567 concrete Substances 0.000 title claims abstract description 123
- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 317
- 239000010959 steel Substances 0.000 claims abstract description 317
- 239000000463 material Substances 0.000 claims abstract description 37
- 238000010008 shearing Methods 0.000 claims abstract description 21
- 238000005452 bending Methods 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 36
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 35
- 238000003466 welding Methods 0.000 claims description 17
- 238000007665 sagging Methods 0.000 claims description 12
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 8
- 239000011440 grout Substances 0.000 claims description 8
- 239000011178 precast concrete Substances 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 238000009417 prefabrication Methods 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 239000003566 sealing material Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 description 10
- 239000004570 mortar (masonry) Substances 0.000 description 10
- 230000003014 reinforcing effect Effects 0.000 description 8
- 238000010276 construction Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 239000011372 high-strength concrete Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000011376 self-consolidating concrete Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
- E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
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- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The novel steel-concrete composite beam structure of tensile shear comprises a concrete left plate, a concrete right plate, a steel beam, a limiting and positioning device, a screw, an upper fixing device, a lower fixing device, a connector, a shear-resistant piece, an upper longitudinal steel bar, a lower longitudinal steel bar and grouting materials, wherein the shear-resistant piece is connected to the upper surface of a steel beam upper flange, the limiting and positioning device is connected to the edge of the steel beam upper flange, and an open cavity is formed between the limiting and positioning device and the upper surface of the steel beam upper flange; the concrete left plate and the concrete right plate are connected to the steel beam through a screw rod, an upper fixing device, a lower fixing device and a connector; the left concrete plate, the right concrete plate, the connector and the limiting and positioning device are bonded into a whole through grouting materials to form a novel tensile shear steel-concrete composite beam structure. And provides a manufacturing process of the novel tensile shear steel-concrete composite beam structure. The structure of the invention has better shearing and pulling resistance bearing capacity under the action of multiaxial external load, and can be applied to various combined beam bridge projects.
Description
Technical Field
The invention relates to the building details of bridge engineering and the construction and construction field thereof, in particular to a novel tensile shear steel-concrete composite beam structure and a manufacturing process thereof.
Background
The application of the combined structure in bridge engineering is developed from the original combined beam to the current combined column, the more complex combined structure tower shrinkage, the mixed beam and other structures, and the traditional structural form is greatly enriched. The steel-concrete combined beam bridge has the advantages that the shear connector is arranged between the steel beam at the lower part and the concrete flange slab at the upper part so as to resist lifting and relative sliding of the steel beam and the concrete flange slab at the interface, so that the steel beam and the concrete flange slab are integrated to work together, the mechanical property, the overall property and the anti-seismic property of the combined steel plate and concrete bridge deck are superior to the respective properties of materials, and the steel and the reinforced concrete materials are organically combined together so as to make up the defects of the respective materials. The most commonly used connectors in the composite structure at present are pin connectors and perforated plate connectors (PBL connectors), and the perforated plate connectors are characterized by high strength and high rigidity, but have great weakening to the concrete part and are easy to cause cracks to occur in the concrete part. For a general construction perforated plate connector, the limit state is shear failure of the concrete in the hole, and the failure is brittle failure; for a peg connection, the limit condition is typically shear failure of the peg root, which failure is ductile. The pin connecting pieces can be flexibly arranged on the surface of the steel structure, special equipment is arranged for welding the pin connecting pieces, construction is convenient, and the pin connecting pieces are widely applied in the combined structure.
In the bending resistance analysis of the composite beam, the welding pin connecting piece only bears the shearing force, so that the current research mainly focuses on researching the shearing resistance of the shearing force connecting piece. Design formulas for its shear capacity are also given in some specifications and standards. However, when the composite beam is subjected to torque or to local loads or bending moments of the support, the connection members are subjected to a combination of pulling and shearing forces. At present, the bridge girder with the combined structure gradually tends to adopt a groove-shaped wide single girder structure, and the connecting piece can bear larger drawing acting force generated by transverse bending of the bridge deck. The connecting piece can bear the tension and shearing combined action at the joint of the mixing beam and the combined cable tower. If only the shearing force of the welding pin connector is considered, the safety hazard is caused.
Disclosure of Invention
In order to overcome the possible problems, the invention provides a novel tensile shear steel-concrete composite beam structure and a manufacturing process thereof, which improve the structural form of the traditional composite beam, and the composite beam has better shear resistance and pulling resistance bearing capacity under the action of multiaxial external load, so that a steel beam and a concrete slab form an organic whole and can be applied to various composite beam bridge projects.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides a novel steel-concrete composite beam structure of tensile scissors, includes concrete left side board, concrete right side board, girder steel, restriction positioner, screw rod, upper fixing device, lower fixing device, connector, shear-resistant spare, upper portion longitudinal reinforcement, lower part longitudinal reinforcement and grouting material, shear-resistant spare connect in girder steel top flange upper surface, restriction positioner connect in girder steel top flange's edge, restriction positioner and girder steel top flange upper surface form the opening cavity; the left concrete plate and the right concrete plate are connected to the steel beam through the screw rod, the upper fixing device, the lower fixing device and the connector; the left concrete plate, the right concrete plate, the connector and the limiting and positioning device are bonded into a whole through the grouting material to form a novel tensile shear steel-concrete composite beam structure.
Further, the concrete left panel includes a concrete slab and the left upper rebar and the left lower rebar; the left upper steel bar and the left lower steel bar are overhanging parts of a part of upper transverse steel bars and lower transverse steel bars in the reinforced concrete slab, the steel bar ends of the left upper steel bar are downward, and the steel bar threads are arranged at the steel bar ends;
the concrete right plate comprises a concrete slab, the right upper steel bar and the right lower steel bar; the right upper steel bar and the right lower steel bar are overhanging parts of a part of upper transverse steel bars and lower transverse steel bars in the reinforced concrete slab, the steel bar ends of the right upper steel bar are downward, and the steel bar threads are arranged at the steel bar ends;
the left upper steel bars and the right upper steel bars are arranged in a staggered mode, steel bar threads of the left upper steel bars are connected with upper end threads of one connector, and steel bar threads of the right upper steel bars are connected with upper end threads of the other connector.
The left upper steel bar comprises a steel bar and a steel bar thread, the left upper steel bar forms an L shape through a 90-degree cold bending process, the steel bar end is downward, the steel bar thread is manufactured at the steel bar end, and the cold bending process is constructed according to relevant standards;
after the left lower reinforcing steel bar passes through a 180-degree cold bending process, the end part of the reinforcing steel bar is in an inverted U shape, and the end part of the reinforcing steel bar is downward.
The right upper steel bar comprises a steel bar and a steel bar thread, the right upper steel bar forms an L shape through a 90-degree cold bending process, the steel bar end is downward, the steel bar thread is manufactured at the steel bar end, and the cold bending process is constructed according to relevant standards;
preferentially, after the right lower reinforcing steel bar passes through a 180-degree cold bending process, the end part of the reinforcing steel bar is in an inverted U shape, the end of the reinforcing steel bar is downward, and the cold bending process is constructed according to relevant standards;
further, offer the confession on the girder steel screw that the screw rod passed, the girder steel screw includes first girder steel screw and second girder steel screw, first girder steel screw aligns with upper left portion reinforcing bar sagging section position, second girder steel screw aligns with upper right portion reinforcing bar sagging section position.
The connector is used for connecting the left upper steel bar or the right upper steel bar with the screw rod, the inner hole threads are matched with the threads of the steel bars at the lower end part of the left upper steel bar or the right upper steel bar, the screw rod, the upper fixing device and the lower fixing device form a connecting device, and the left upper steel bar or the right upper steel bar is connected with the steel beam through the connector.
The upper end and the lower end of the screw rod are respectively provided with threads, the threads are identical, the threads are matched with the internal control threads of the connector, the upper fixing device and the lower fixing device respectively comprise a gasket and a nut, and the nuts are matched with the threads on the screw rod.
Preferably, the concrete slab is preferably high strength concrete.
Preferentially, the steel beam is made of corrosion-resistant and high-temperature-resistant alloy steel.
The diameters of the first steel beam screw holes and the second steel beam screw holes are 1-2 mm larger than the diameter of the screw rod.
Furthermore, the limiting and positioning device is arranged at all edges of the upper surface of the upper flange of the steel beam in a bonding or welding mode, and an open cavity is formed between the limiting and positioning device and the upper surface of the upper flange of the steel beam.
Preferably, the limiting and positioning device is made of a polymer material, and can also be made of the same material as the steel beam, and the height of the limiting and positioning device is 10-30 mm.
Further, the shearing resistant piece is arranged on the upper surface of the upper flange of the steel beam through a welding process.
Preferably, the shearing resistant member is preferably a peg, and can also be in the form of a bolt, an apertured plate, a channel steel and the like.
Further, the materials of the upper longitudinal steel bars and the lower longitudinal steel bars are respectively the same as those of the upper longitudinal steel bars and the lower longitudinal steel bars of the left concrete plate and the right concrete plate, and the integrity of the joint can be improved.
Furthermore, the grouting material is preferably epoxy mortar, and can also be self-compacting concrete.
Further, the left concrete plate and the right concrete plate, which are in contact with the grouting material, should be provided with grout stopping tapes at the time of factory prefabrication.
Preferably, the slurry stopping belt is a product with a finer surface.
A manufacturing process of a novel tensile shear steel-concrete composite beam structure, which comprises the following steps:
(1) Factory prefabrication
1.1 Preparing concrete materials, reinforced bar materials and grout stopping belts for manufacturing precast slabs;
1.2 Binding reinforcing steel bars and manufacturing templates according to concrete slab structures in the drawing, wherein a grout stopping belt is adopted for the concrete slab part contacted with the grouting material;
1.3 Upper and lower reinforcing steel bars extending outwards from the two butted concrete slabs are staggered; anchoring the upper steel bars and the lower parts of the outwards-extending concrete plates, forming an L shape by the upper steel bars through a 90-degree cold bending process, and manufacturing steel bar threads at the end parts of the steel bars with the ends downwards; after the lower reinforcing steel bar passes through a 180-degree cold bending process, the end part of the reinforcing steel bar is in an inverted U shape, the end of the reinforcing steel bar is downward, and the cold bending process is constructed according to relevant standards;
1.4 Pouring concrete, maintaining and removing the mould, tearing off the slurry stopping belt with the concave-convex surface regular, and forming all concrete precast slabs;
1.5 Preparing a steel plate for manufacturing a steel beam blank, cutting the steel plate, and forming a steel beam by welding;
1.6 Steel beam screw holes are formed in the upper flange of the steel beam and aligned with the sagging positions of the upper steel bars;
1.7 Derusting the upper surface of the steel beam, arranging a limiting and positioning device on the periphery of the upper surface of the upper flange of the steel beam, and forming a cavity with an upper opening between the limiting and positioning device and the upper surface of the upper flange of the steel beam;
1.8 A shear connector is arranged on the surface of the steel beam through a welding line;
1.9 Sand blasting is carried out on the surface of the steel beam at the joint and the surface of the shearing-resistant connecting piece, and corrosion and fire protection treatment is carried out on other parts;
1.10 Manufacturing or purchasing a screw, an upper fixing device, a lower fixing device and a limiting and positioning device;
(2) On-site assembly
2.1 Transporting the prefabricated steel beams and the concrete slabs to the site for stacking, and waiting for assembly;
2.2 Erecting the steel girder on a support of an engineering site;
2.3 Connecting the sagging section of the upper steel bar with the upper end of the screw rod by a torque wrench through a connector, requiring to achieve the torque specified by the relevant specifications of the steel bar connector, sleeving the upper fixing device on the screw rod, and bonding the upper fixing device on the screw rod in a temporary fixing mode;
2.4 Mounting the precast concrete slab on the steel beam by hoisting, wherein the precast concrete slab is in direct contact with the limiting and positioning device, so that the lower end of each screw rod passes through a steel beam screw hole on the steel beam and is arranged;
2.5 Upper longitudinal steel bars, lower longitudinal steel bars and steel bars extending outwards from a concrete slab are connected into a whole in a plate binding mode;
2.6 After the whole body is stable, screwing the upper fixing device, and ensuring that the upper fixing device is tightly attached to the upper surface of the upper flange of the steel beam;
2.7 Pouring the prepared grouting material into the joint formed between the steel beam and the precast slab;
2.8 After solidification, the lower fixing device passes through the lower part of the screw rod and is screwed up, and the screw rod is sealed by adopting a sealing material to prevent corrosion.
The beneficial effects of the invention are mainly shown in the following steps:
(1) The upper steel bar extending outwards from the concrete slab is bent to be 90 degrees downwards by adopting a cold bending process, and is connected with the screw rod into a whole by adopting a connector, the screw rod penetrates through a hole formed in the steel beam and is connected to the steel beam by an upper fixing device and a lower fixing device, after pouring grouting materials are solidified, the connection between the concrete slab and the steel beam is more stable, and when shearing force, torsion, transverse bending moment or support hogging moment acts on the steel-concrete composite beam, the lower bending section of the upper steel bar, a connecting machine and the upper part of the screw rod can play a shearing resistance role, and the shearing force generated by each working condition at the interface of the composite structure can be resisted; when tension or torque is generated between the concrete and the steel beams under various working conditions, the lower bending section of the upper steel bar, the connecting machine and the screw rod can play a role in resisting pulling or torsion, and the lower bending section of the upper steel bar, the connecting machine and the screw rod are in a state of missing between the steel beams and the concrete slab and guaranteeing close fit.
(2) The structure is jointly sheared by the shearing resistant piece, the screw rod and the upper steel bar bending part and the epoxy mortar, so that the shearing resistant bearing capacity of the traditional combined beam scheme is greatly improved.
(3) When the concrete slab is precast, the uneven grout stopping belt is arranged on the concrete slab at the joint, so that the surface of the precast slab at the joint is regular uneven, and the epoxy mortar is matched with the ultra-strong compression resistance, shear resistance, deformation coordination capacity and peeling resistance of the epoxy mortar, so that the epoxy mortar at the joint and the precast slab are effectively connected, and the situation of cracking at the joint of new and old blocks under the action of external load can be prevented.
(4) And when the epoxy mortar is poured, the epoxy mortar can fill the open cavity, so that the connection between the steel beam and the concrete precast slab is free of gaps. On one hand, the waterproof effect can be achieved, the situation that the upper surface of the upper flange plate of the steel beam is free from the precast slab is prevented, the upper surface of the steel beam and the shearing-resistant connecting piece are prevented from being rusted in a wet environment, and the durability of the steel-concrete composite girder bridge is improved; on the other hand, the layer of epoxy mortar between the steel beam and the concrete can work together with the shear connector to resist shearing force for the structure, and fatigue damage of the shear connector during working can be relieved.
Drawings
FIG. 1 is a schematic view of an unassembled front cut-away view of a novel tension shear steel-concrete composite beam structure.
Fig. 2 is a schematic drawing of a front cut-away view of a novel tensile shear steel-concrete composite beam structure without casting.
FIG. 3 is a cross-sectional view A-A of a novel tensile shear steel-concrete composite beam structure.
Fig. 4 is an exploded view of a novel steel-concrete composite beam structure of the tensile shears.
Wherein 11 is a left concrete plate, 111 is a left upper steel bar, 112 is a left lower steel bar, 12 is a right concrete plate, 121 is a right upper steel bar, 122 is a right upper steel bar, 13 is a steel bar thread, 2 is a steel beam, 211 is a first steel beam screw hole, 212 is a second steel beam screw hole, 3 is a limiting positioning device, 4 is a screw rod, 41 is an upper fixing device, 42 is a lower fixing device, 5-bit connector, 6 is a shear-resistant piece, 7 is an upper longitudinal steel bar, 8 is a lower longitudinal steel bar, 9 is grouting material, and 10 is a slurry tape.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 4, a novel steel-concrete composite beam structure of tensile shears includes a concrete left plate 11, a concrete right plate 12, a steel beam 2, a limiting and positioning device 3, a screw 4, an upper fixing device 41, a lower fixing device 42, a connector 5, a shear member 6, an upper longitudinal steel bar 7, a lower longitudinal steel bar 8 and a grouting material 9. The shearing resistant piece 6 is connected to the upper surface of the upper flange of the steel beam 2 in a welding mode, and the limiting and positioning device 3 is connected to the edge of the upper flange of the steel beam 2 in a bonding or welding mode and forms an open cavity with the upper surface of the upper flange of the steel beam 2; the left concrete plate 11 and the right concrete plate 12 are connected to the steel beam 2 through the screw 4, the upper fixing device 41, the lower fixing device 42 and the connector 5; the left concrete plate 11, the right concrete plate 12 and the connecting piece 6 and the limiting and positioning device 3 are bonded into a whole through grouting materials 9 to form a novel tensile shear steel-concrete composite beam structure.
The concrete left panel 11 includes concrete and left upper reinforcing bars 111 and left lower reinforcing bars 112, and the concrete panel preferably adopts high-strength concrete.
The left upper steel bar 111 and the left lower steel bar 112 are overhanging parts of a part of upper transverse steel bars and lower transverse steel bars in the reinforcement of the concrete left plate 11, and the upper steel bars comprise steel bars and steel bar threads 13; the left upper steel bar 111 comprises a steel bar and a steel bar thread 13, the left upper steel bar 111 forms an L shape through a 90-degree cold bending process, the steel bar end is downward, the steel bar thread 13 is manufactured at the steel bar end, and the cold bending process is constructed according to relevant standards; after the left lower reinforcing steel bar 112 passes through a 180-degree cold bending process, the end part of the reinforcing steel bar is in an inverted U shape, the end of the reinforcing steel bar is downward, and the cold bending process is constructed according to relevant standards.
The concrete right plate 12 comprises concrete and right upper steel bars 121 and right lower steel bars 122, and the concrete plate adopts high-strength concrete preferentially; the left upper steel bar 121 and the left lower steel bar 122 are overhanging parts of a part of upper transverse steel bars and lower transverse steel bars in the reinforcement of the concrete right plate 12, and the upper steel bars comprise steel bars and steel bar threads 13; the right upper steel bar 121 comprises steel bars and steel bar threads, the right upper steel bar 121 forms an L shape through a 90-degree cold bending process, the steel bar end is downward, the steel bar threads are manufactured at the steel bar end, and the cold bending process is constructed according to relevant standards; after the right lower reinforcing steel bar 122 passes through a 180-degree cold bending process, the end part of the reinforcing steel bar is in an inverted U shape, the end of the reinforcing steel bar is downward, and the cold bending process is constructed according to relevant standards.
The steel beam 2 is provided with steel beam screw holes, the steel beam adopts corrosion-resistant and high-temperature-resistant alloy steel, the steel beam screw comprises a first steel beam screw hole 211 and a second steel beam screw hole 212, the first steel beam screw hole 211 is aligned with the position of the sagging section of the left upper steel bar 111, the second steel beam screw hole 212 is aligned with the position of the sagging section of the right upper steel bar 121, and the diameters of the first steel beam screw hole 211 and the second steel beam screw hole 212 are 2mm larger than the diameter of the screw rod; the limiting and positioning device 3 is arranged at all edges of the upper surface of the upper flange of the steel beam 2 in a bonding or welding mode, and an open cavity is formed between the limiting and positioning device and the upper surface of the upper flange of the steel beam 2; the limiting and positioning device 3 is made of the same material as the steel beam 3, and the height of the limiting and positioning device 3 is 30mm.
The connector 5 is used for connecting the left upper reinforcing bar 111 or the right upper reinforcing bar 121 with the screw 4; the coupler 3 is made of a high-strength material, and the female screw thread of the coupler is matched with the screw thread 13 of the lower end portion of the left upper reinforcing bar 111 or the right upper reinforcing bar 121.
The screw 4, the upper fixing device 41 and the lower fixing device 42 form a connecting device, the left upper steel bar 111 or the right upper steel bar is connected with the steel beam 121 through the connector 5, threads are arranged at the upper end and the lower end of the screw 4, the threads are the same, the threads are matched with the internal control threads of the connector 5, and the screw 4 is made of high-strength materials; the upper fixing device 41 and the lower fixing device 42 each comprise a gasket and a nut, and the nuts are matched with threads on the screw rods and are made of high-strength materials.
The shearing resistant member 6 is arranged on the upper surface of the upper flange of the steel beam 2 through a welding process; the shear element 6 is preferably in the form of a peg; the upper longitudinal steel bars 7 and the lower longitudinal steel bars 8 are respectively made of the same materials as the upper longitudinal steel bars and the lower longitudinal steel bars of the left concrete plate 11 and the right concrete plate 12, the grouting material 9 is epoxy mortar, and when the grouting material 9 is prefabricated in a factory, the grouting belt 10 is adopted at the parts of the left concrete plate 11 and the right concrete plate 12 which are contacted with the grouting material 9.
A manufacturing process of a novel tensile shear steel-concrete composite beam structure comprises the following steps:
(1) Factory prefabrication
1.1 Preparing concrete materials, reinforced bar materials and grout stopping belts for manufacturing precast slabs;
1.2 Binding reinforcing steel bars and manufacturing templates according to concrete slab structures in the drawing, wherein a grout stopping belt is adopted for the concrete slab part contacted with the grouting material;
1.3 Upper and lower reinforcing steel bars extending outwards from the two butted concrete slabs are staggered; anchoring the upper steel bars and the lower parts of the outwards-extending concrete plates, forming an L shape by the upper steel bars through a 90-degree cold bending process, and manufacturing steel bar threads at the end parts of the steel bars with the ends downwards; after the lower reinforcing steel bar passes through a 180-degree cold bending process, the end part of the reinforcing steel bar is in an inverted U shape, the end of the reinforcing steel bar is downward, and the cold bending process is constructed according to relevant standards;
1.4 Pouring concrete, maintaining and removing the mould, tearing off the slurry stopping belt with the concave-convex surface regular, and forming all concrete precast slabs;
1.5 Preparing a steel plate for manufacturing a steel beam blank, cutting the steel plate, and forming a steel beam with an I shape, an H shape, a T shape or other shapes by welding;
1.6 Steel beam screw holes are formed in the upper flange of the steel beam and aligned with the sagging positions of the upper steel bars;
1.7 Derusting the upper surface of the steel beam, arranging a limiting and positioning device on the periphery of the upper surface of the upper flange of the steel beam, and forming a cavity with an upper opening between the limiting and positioning device and the upper surface of the upper flange of the steel beam;
1.8 A shear connector is arranged on the surface of the steel beam through a welding line;
1.9 Sand blasting is carried out on the surface of the steel beam at the joint and the surface of the shearing-resistant connecting piece, and corrosion and fire protection treatment is carried out on other parts;
1.10 Manufacturing or purchasing a screw, an upper fixing device, a lower fixing device and a limiting and positioning device;
(2) On-site assembly
2.1 Transporting the prefabricated steel beams and the concrete slabs to the site, and reasonably stacking the steel beams and the concrete slabs to be spliced;
2.2 Erecting the steel girder on a support of an engineering site;
2.3 Connecting the sagging section of the upper steel bar with the upper end of the screw rod by a torque wrench through a connector, requiring to achieve the torque specified by the relevant specifications of the steel bar connector, sleeving the upper fixing device on the screw rod, and bonding the upper fixing device on the screw rod in a temporary fixing mode;
2.4 Mounting the precast concrete slab on the steel beam by hoisting, wherein the precast concrete slab is in direct contact with the limiting and positioning device, so that the lower end of each screw rod passes through a steel beam screw hole on the steel beam and is arranged;
2.5 Upper longitudinal steel bars, lower longitudinal steel bars and steel bars extending outwards from a concrete slab are connected into a whole in a plate binding mode;
2.6 After the whole body is stable, screwing the upper fixing device, and ensuring that the upper fixing device is tightly attached to the upper surface of the upper flange of the steel beam;
2.7 Pouring the prepared grouting material (epoxy mortar) into the joint formed between the steel beam and the precast slab;
2.8 After solidification, the lower fixing device passes through the lower part of the screw rod and is screwed up, and the screw rod is sealed by adopting a sealing material to prevent corrosion.
Claims (7)
1. The novel tensile shear steel-concrete composite beam structure is characterized by comprising a concrete left plate, a concrete right plate, a steel beam, a limiting and positioning device, a screw, an upper fixing device, a lower fixing device, a connector, a shear-resistant member, an upper longitudinal steel bar, a lower longitudinal steel bar and a grouting material, wherein the shear-resistant member is connected to the upper surface of the upper flange of the steel beam, the limiting and positioning device is connected to the edge of the upper flange of the steel beam, and an opening cavity is formed between the limiting and positioning device and the upper surface of the upper flange of the steel beam; the left concrete plate and the right concrete plate are connected to the steel beam through the screw rod, the upper fixing device, the lower fixing device and the connector; the concrete left plate, the concrete right plate, the connector and the limiting and positioning device are bonded into a whole through the grouting material to form a novel steel-concrete combined beam structure of the tensile shears;
the concrete left plate comprises a concrete plate, left upper reinforcing steel bars and left lower reinforcing steel bars; the left upper steel bar and the left lower steel bar are overhanging parts of a part of upper transverse steel bars and lower transverse steel bars in the reinforced concrete slab, the steel bar ends of the left upper steel bar are downward, and steel bar threads are arranged at the steel bar ends;
the concrete right plate comprises a concrete plate, right upper steel bars and right lower steel bars; the right upper steel bar and the right lower steel bar are overhanging parts of a part of upper transverse steel bars and lower transverse steel bars in the reinforced concrete slab, the steel bar ends of the right upper steel bar are downward, and steel bar threads are arranged at the steel bar ends;
the left upper steel bars and the right upper steel bars are arranged in a staggered mode, steel bar threads of the left upper steel bars are connected with upper end threads of one connector, and steel bar threads of the right upper steel bars are connected with upper end threads of the other connector;
the steel beam is provided with a steel beam screw hole for the screw rod to pass through, the steel beam screw hole comprises a first steel beam screw hole and a second steel beam screw hole, the first steel beam screw hole is aligned with the position of the sagging section of the left upper steel bar, and the second steel beam screw hole is aligned with the position of the sagging section of the right upper steel bar;
the connector is used for connecting the left upper steel bar or the right upper steel bar with the screw rod, the inner hole threads of the connector are matched with the threads of the steel bars at the lower end part of the left upper steel bar or the right upper steel bar, the screw rod, the upper fixing device and the lower fixing device form a connecting device, and the left upper steel bar or the right upper steel bar is connected with the steel beam through the connector.
2. The novel tensile shear steel-concrete composite beam structure according to claim 1, wherein the left upper steel bar comprises steel bars and steel bar threads, the left upper steel bar is formed into an L shape through a 90-degree cold bending process, the steel bar ends are downward, the steel bar threads are manufactured at the steel bar ends, and the cold bending process is constructed according to relevant standards;
after the left lower reinforcing steel bar passes through a 180-degree cold bending process, the end part of the reinforcing steel bar is in an inverted U shape, and the end part of the reinforcing steel bar is downward.
3. The novel tensile shear steel-concrete composite beam structure according to claim 1, wherein the right upper steel bar comprises steel bars and steel bar threads, the right upper steel bar is formed into an L shape through a 90-degree cold bending process, the steel bar ends are downward, the steel bar threads are manufactured at the steel bar ends, and the cold bending process is constructed according to relevant standards;
after the right lower reinforcing steel bar passes through a 180-degree cold bending process, the end part of the reinforcing steel bar is in an inverted U shape, the end of the reinforcing steel bar is downward, and the cold bending process is constructed according to relevant standards.
4. The steel-concrete composite beam structure of a novel tensile shear as defined in claim 1, wherein the screw has threads on the upper end and the lower end, the threads are identical, the threads are matched with the threads of the inner hole of the connector, the upper fixing device and the lower fixing device comprise a gasket and a nut, and the nuts are matched with the threads on the screw.
5. A novel tensile shear steel-concrete composite beam structure according to any one of claims 1 to 3, wherein the limiting and positioning device is arranged at all edges of the upper surface of the upper flange of the steel beam in a bonding or welding mode, and an open cavity is formed between the limiting and positioning device and the upper surface of the upper flange of the steel beam.
6. A novel tensile shear steel-concrete composite beam structure according to any one of claims 1 to 3, wherein the shear member is disposed on the upper surface of the upper flange of the steel beam by a welding process.
7. A process for manufacturing a novel tensile shear steel-concrete composite beam structure according to claim 1, wherein the manufacturing process comprises the following steps:
(1) Factory prefabrication
1.1 Preparing concrete materials, reinforced bar materials and grout stopping belts for manufacturing precast slabs;
1.2 Binding reinforcing steel bars and manufacturing templates according to concrete slab structures in the drawing, wherein a grout stopping belt is adopted for the concrete slab part contacted with the grouting material;
1.3 Upper and lower reinforcing steel bars extending outwards from the two butted concrete slabs are staggered; anchoring the upper steel bars and the lower parts of the outwards-extending concrete plates, forming an L shape by the upper steel bars through a 90-degree cold bending process, and manufacturing steel bar threads at the end parts of the steel bars with the ends downwards; after the lower reinforcing steel bar passes through a 180-degree cold bending process, the end part of the reinforcing steel bar is in an inverted U shape, the end of the reinforcing steel bar is downward, and the cold bending process is constructed according to relevant standards;
1.4 Pouring concrete, maintaining and removing the mould, tearing off the slurry stopping belt with the concave-convex surface regular, and forming all concrete precast slabs;
1.5 Preparing a steel plate for manufacturing a steel beam blank, cutting the steel plate, and forming a steel beam by welding;
1.6 Steel beam screw holes are formed in the upper flange of the steel beam and aligned with the sagging positions of the upper steel bars;
1.7 Derusting the upper surface of the steel beam, arranging a limiting and positioning device on the periphery of the upper surface of the upper flange of the steel beam, and forming a cavity with an upper opening between the limiting and positioning device and the upper surface of the upper flange of the steel beam;
1.8 A shear connector is arranged on the surface of the steel beam through a welding line;
1.9 Sand blasting is carried out on the surface of the steel beam at the joint and the surface of the shearing-resistant connecting piece, and corrosion and fire protection treatment is carried out on other parts;
1.10 Manufacturing or purchasing a screw, an upper fixing device, a lower fixing device and a connector;
(2) On-site assembly
2.1 Transporting the prefabricated steel beams and the concrete slabs to the site for stacking, and waiting for assembly;
2.2 Erecting the steel girder on a support of an engineering site;
2.3 Connecting the sagging section of the upper steel bar with the upper end of the screw rod by a torque wrench through a connector, requiring to achieve the torque specified by the relevant specifications of the steel bar connector, sleeving the upper fixing device on the screw rod, and bonding the upper fixing device on the screw rod in a temporary fixing mode;
2.4 Mounting the precast concrete slab on the steel beam by hoisting, wherein the precast concrete slab is in direct contact with the limiting and positioning device, so that the lower end of each screw rod passes through a steel beam screw hole on the steel beam and is arranged;
2.5 Upper longitudinal steel bars, lower longitudinal steel bars and steel bars extending outwards from the concrete slab are connected into a whole in a plate binding mode;
2.6 After the whole body is stable, screwing the upper fixing device, and ensuring that the upper fixing device is tightly attached to the upper surface of the upper flange of the steel beam;
2.7 Pouring the prepared grouting material into the joint formed between the steel beam and the precast slab;
2.8 After solidification, the lower fixing device passes through the lower part of the screw rod and is screwed up, and the screw rod is sealed by adopting a sealing material to prevent corrosion.
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| CN113585618B (en) * | 2021-06-11 | 2022-10-04 | 中建科技（福州）有限公司 | Precast concrete composite beam and construction method thereof |
| CN114892499B (en) * | 2022-05-11 | 2024-04-26 | 北京工业大学 | Prefabricated assembled steel-concrete composite girder bridge shearing-resistant connecting piece and construction method |
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