CN211114417U - Novel steel-concrete composite beam structure of tensile shear - Google Patents

Abstract

A novel tensile and shear-resistant steel-concrete composite beam structure includes a left concrete slab, a right concrete slab, a steel girder, a limiting positioning device, a screw rod, an upper fixing device, a lower fixing device, a connector, a shear-resisting member, and an upper longitudinal reinforcing bar , The lower longitudinal steel bar and grouting material, the shear parts are connected to the upper surface of the upper flange of the steel beam, the limiting positioning device is connected to the edge of the upper flange of the steel beam, and forms an open cavity with the upper surface of the upper flange of the steel beam; the left concrete slab and the concrete right slab pass through the screw , the upper fixing device, and the lower fixing device and the connector are connected to the steel beam; the concrete left plate, the concrete right plate, the connector and the limiting positioning device are bonded together by the grouting material to form a new tensile shear steel-concrete combination beam structure. The structure of the utility model has good shear and pull-out bearing capacity under the action of multi-axial external loads, and can be applied to various composite beam bridge projects.

Description

A Novel Steel-Concrete Composite Beam Structure with Tensile Shear Resistance

technical field

The utility model relates to the architectural details of bridge engineering and the fields of structure and construction, in particular to a novel tensile and shear-resistant steel-concrete composite beam structure.

Background technique

The application of composite structure in bridge engineering has developed from the initial composite beam to the present composite column and more complex composite structures such as shrinking towers and mixed beams, which greatly enriches the traditional structural forms. The steel-concrete composite girder bridge sets up a shear connection between the lower steel girder and the upper concrete flange slab to resist the lifting and relative slippage at the interface, so that the two become a whole. Working together, the mechanical properties, overall performance and seismic performance of the steel plate and concrete bridge deck combined exceed the respective properties of the materials. The organic combination of steel and reinforced concrete materials can make up for the shortcomings of their respective materials. At present, the most commonly used connectors in composite structures are stud connectors and perforated plate connectors (PBL connectors). The perforated plate connectors are characterized by high strength and rigidity, but they greatly weaken the concrete part , which is more likely to cause cracks in the concrete part. For general structural perforated plate connectors, the limit state is the shear failure of concrete in the hole, and its failure is brittle failure; for stud connectors, the limit state is generally shear failure at the root of the stud, and its failure is ductile failure. . The stud connector can be flexibly arranged on the surface of the steel structure, and the welding stud connector has special equipment, which is convenient for construction, and the welding stud connector is widely used in the composite structure.

In the flexural analysis of composite beams, the welding stud connector only bears the shear force, so the current research mainly focuses on the shear resistance of the shear connector. At present, the design formula of its shear bearing capacity is also given in some codes and standards. However, when the composite beam is subjected to torsion or local load or negative bending moment of the support, the connector will be subjected to the combined action of pull-out force and shear force. At present, the main girder of composite structure bridges gradually tends to adopt the trough-shaped wide-width single main girder structure, and the connecting parts will bear the large pulling force caused by the lateral bending of the bridge deck. Also at the joint of the hybrid beam and the combined cable tower, the connector will also bear the combined effect of tension and shear. If only the shear force of the welding stud connector is considered, it will cause a safety hazard.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned possible problems, the present utility model proposes a novel tensile shear-resistant steel-concrete composite beam structure, which improves the structural form of the traditional composite beam. Under the action of multi-axial external loads, the composite beam can It has good shear and pull-out bearing capacity, so that the steel beam and the concrete slab form an organic whole, which can be used in various composite beam bridge projects.

The technical scheme adopted by the utility model to solve its technical problems is:

A novel tensile and shear-resistant steel-concrete composite beam structure includes a left concrete slab, a right concrete slab, a steel girder, a limiting positioning device, a screw rod, an upper fixing device, a lower fixing device, a connector, a shear-resisting member, and an upper longitudinal reinforcing bar , the lower longitudinal reinforcement and grouting material, the shearing member is connected to the upper surface of the upper flange of the steel beam, the limiting positioning device is connected to the edge of the upper flange of the steel beam, and the limiting positioning device is connected to the upper flange of the steel beam. The surface forms an open cavity; the concrete left plate and the concrete right 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 positioning device are bonded together through the grouting material to form a new tensile shear-resistant steel-concrete composite beam structure.

Further, the concrete left slab comprises a concrete slab, the left upper steel bar and the left lower steel bar; the left upper steel bar and the left lower steel bar are the outer parts of a part of the upper transverse steel bar and the lower left transverse steel bar in the reinforcement of the concrete slab. In the extension part, the reinforcing bar end of the upper left reinforcing bar is downward, and the reinforcing bar thread is arranged at the end of the reinforcing bar;

The concrete right slab includes a concrete slab, the right upper reinforcement bar and the right lower reinforcement bar; the right upper reinforcement bar and the right lower reinforcement bar are the outriggers of a part of the upper transverse reinforcement bar and the lower right transverse reinforcement bar in the reinforcement of the concrete slab , the reinforcing bar end of the upper right reinforcing bar is downward, and the reinforcing bar thread is arranged at the end of the reinforcing bar;

The upper left reinforcement bar and the upper right reinforcement reinforcement are arranged in a staggered manner, the reinforcement thread of the upper left reinforcement reinforcement is threadedly connected to the upper end of one connector, and the reinforcement thread of the upper right reinforcement reinforcement is threadedly connected to the upper end of the other connector.

The left upper steel bar includes steel bars and steel threads, the left upper steel bar is formed into an "L" shape through a 90° cold bending process, the end of the steel bar is downward, and the steel bar thread is made at the end of the steel bar, and the cold bending process is in accordance with relevant standards. construction;

After the steel bar in the lower left part passes through the 180° cold bending process, the end of the steel bar is in an inverted "U" shape, and the end of the steel bar is downward.

The upper right steel bar includes steel bars and steel threads, the upper right steel bar is formed into an "L" shape through a 90° cold bending process, the end of the steel bar is downward, and the steel bar thread is made at the end of the steel bar, and the cold bending process is in accordance with relevant standards. construction;

Preferably, after the steel bar in the lower right part passes through the 180° cold bending process, the end of the steel bar is in an inverted "U" shape, and the end of the steel bar is downward, and the cold bending process is constructed according to relevant standards;

Further, the steel beam is provided with a steel beam screw hole for the screw rod to pass through, and the steel beam screw hole includes a first steel beam screw hole and a second steel beam screw hole, and the first steel beam screw hole is connected with the first steel beam screw hole. The position of the sagging section of the upper left steel bar is aligned, and the screw hole of the second steel beam is aligned with the position of the sagging section of the upper right steel bar.

The connector is used to connect the upper left steel bar or the upper right steel bar and the screw rod, and the inner hole thread is matched with the steel bar thread at the lower end of the upper left steel bar or the upper right steel bar. The screw rod, the upper fixing device and the lower fixing device constitute a connecting device, and the left upper steel bar or the right upper steel bar is connected to the steel beam through the connector.

The upper and lower ends of the screw rod have threads, the threads are the same, and the threads are matched with the internal control threads of the connector. Both the upper fixing device and the lower fixing device include a washer and a nut. Thread matching.

Preferably, the concrete slab is preferably made of high-strength concrete.

Preferably, the steel beam is made of corrosion-resistant, high-temperature-resistant alloy steel.

The diameter of the first steel beam screw hole and the second steel beam screw hole is 1-2 mm larger than the diameter of the screw.

Further, the limiting positioning device is disposed at all edges of the upper surface of the upper flange of the steel beam by means of bonding or welding, and an open cavity is formed between the upper surface of the upper flange of the steel beam and the upper surface of the upper flange of the steel beam.

Preferably, the limiting and positioning device is preferably made of a polymer material, and the same material as the steel beam can also be used, and the height of the limiting positioning device is 10 mm to 30 mm.

Further, the shearing member is disposed on the upper surface of the upper flange of the steel beam through a welding process.

Preferably, the shearing parts are preferably studs, and can also be in the form of bolts, perforated plates, channel steel and the like.

Further, the materials of the upper longitudinal reinforcing bars and the lower longitudinal reinforcing bars are respectively the same as the upper and lower longitudinal reinforcing bars of the concrete left slab and the concrete right slab, which can improve the integrity of the joint.

Further, epoxy mortar is preferably used as the grouting material, and self-compacting concrete can also be used.

Further, during prefabrication in the factory, the parts of the left concrete slab and the right concrete slab that are in contact with the grouting material should adopt a grout stopper.

Preferably, the stop tape is preferably a product with a finer surface.

The beneficial effects of the present utility model are mainly manifested in:

(1) The upper steel bar overhanging the concrete slab is bent at 90° downward by cold bending process, and is connected with the screw rod to form a whole. It is connected to the steel beam. After the pouring grouting material is solidified, the connection between the concrete slab and the steel beam is more stable. When the shear force, torsion, transverse bending moment or negative bending moment of the bearing acts on the steel-concrete composite beam, the upper The lower bending section of the steel bar, the connecting machine and the upper part of the screw can play a shear resistance role, which can resist the shear force generated at the interface of the composite structure under various working conditions; when various working conditions cause tension or torque between the concrete and the steel beam, etc. , The lower bending section of the upper steel bar, the connecting machine and the screw can play the role of anti-pulling or anti-torsion, which is the state of the gap between the steel beam and the concrete slab to ensure a close fit.

(2) The structure is shear-resistant through the shear-resistant parts, the screw, the lower part of the upper steel bar, and the epoxy mortar, which greatly improves the shear bearing capacity of the existing composite beam scheme.

(3) When prefabricating concrete slabs, a concave-convex grout-stopping tape is arranged on the joint concrete formwork, so that the surface of the prefabricated slab at the joints is regular concave-convex shape, with the super compressive and shear resistance of epoxy mortar, The deformation coordination ability and peeling resistance can form an effective connection between the epoxy mortar and the prefabricated board at the joint, which can prevent cracking at the junction of the new and old blocks under the action of external loads.

(4) There is an opening in the new city between the limiting positioning device set on the steel beam and the steel beam. The prefabricated plate is erected on the limiting positioning device. When epoxy mortar is poured, the epoxy mortar can fill the opening cavity, so that the steel The connection between the beam and the precast concrete slab is free of gaps. On the one hand, it can play a waterproof effect, prevent the void between the upper surface of the upper flange of the steel beam and the prefabricated plate, avoid the corrosion of the upper surface of the steel beam and the shear connector in a humid environment, and improve the performance of steel-concrete. Durability of composite girder bridges; on the other hand, this layer of epoxy mortar between the steel girder and concrete can work with shear connectors to resist shear forces for the structure and relieve the shear connectors during operation. fatigue damage.

Description of drawings

FIG. 1 is an unassembled front sectional schematic diagram of a new type of steel-concrete composite beam structure with resistance to tensile shear.

FIG. 2 is a schematic cross-sectional front view of a new type of steel-concrete composite beam structure with tensile shear resistance without pouring.

Figure 3 is an A-A sectional view of a new tensile shear steel-concrete composite beam structure.

Figure 4 is an exploded schematic diagram of a new type of steel-concrete composite beam structure with tensile shear resistance.

Among them, 11 is the concrete left slab, 111 is the upper left steel bar, 112 is the lower left steel bar, 12 is the right concrete slab, 121 is the upper right steel bar, 122 is the upper right steel bar, 13 is the steel thread, 2 is the steel beam, and 211 is the steel bar. The first steel beam screw hole, 212 is the second steel beam screw hole, 3 is the limiting positioning device, 4 is the screw rod, 41 is the upper fixing device, 42 is the lower fixing device, 5 is the connector, 6 is the anti-shear piece, 7 It is the upper longitudinal steel bar, 8 is the lower longitudinal steel bar, 9 is the grouting material, and 10 is the grouting tape.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1 to 4, a new type of steel-concrete composite beam structure with tensile and shear resistance includes a concrete left plate 11, a concrete right plate 12, a steel beam 2, a limiting positioning device 3, a screw 4, an upper fixing device 41, a lower Fixtures 42 , connectors 5 , shear members 6 , upper longitudinal steel bars 7 , lower longitudinal steel bars 8 and grouting material 9 . The shearing member 6 is connected to the upper surface of the upper flange of the steel beam 2 by welding, and the limiting positioning device 3 is connected to the edge of the upper flange of the steel beam 2 by bonding or welding, forming an open space with the upper surface of the upper flange of the steel beam 2. cavity; the concrete left plate 11 and the concrete right 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 concrete left plate 11, the concrete right plate 12 and the connecting piece 6 It is bonded with the limiting positioning device 3 through the grouting material 9 to form a new type of steel-concrete composite beam structure with resistance to tensile and shear.

The left concrete slab 11 includes concrete, the upper left steel bar 111 and the lower left steel bar 112, and the concrete slab is preferably made of high-strength concrete.

The left upper reinforcement bar 111 and the left lower reinforcement bar 112 are the outriggers of a part of the upper transverse reinforcement bar and the lower transverse reinforcement bar in the reinforcement of the left concrete slab 11, the upper reinforcement bar includes reinforcement bars and reinforcement threads 13; the left upper reinforcement bar 111 includes reinforcement bars and reinforcement threads 13, The upper left steel bar 111 is formed into an "L" shape through a 90° cold bending process, the end of the steel bar is downward, and the steel bar thread 13 is made at the end of the steel bar. The cold bending process is constructed according to relevant standards; , the end of the steel bar is in an inverted "U" shape, the end of the steel bar is downward, and the cold bending process is constructed according to relevant standards.

The right concrete slab 12 includes concrete, the upper right steel reinforcement 121 and the lower right steel reinforcement 122, and the concrete slab is preferably made of high-strength concrete; The overhanging part of the upper right steel bar includes steel bars and steel threads 13; the right upper steel bar 121 includes steel bars and steel threads, and the right upper steel bar 121 is formed into an "L" shape by a 90° cold bending process, with the end of the steel bar facing down, at the end of the steel bar To make rebar threads, the cold bending process is constructed according to relevant standards; after the lower right steel bar 122 passes the 180° cold bending process, the end of the rebar becomes an inverted "U" shape, and the end of the rebar is downward, and the cold bending process is constructed according to the relevant standards.

The steel beam 2 is provided with steel beam screw holes, the steel beam is made of corrosion-resistant and high-temperature-resistant alloy steel, and the steel beam screw includes the first steel beam screw hole 211 and the second steel beam screw hole 212, and the first steel beam screw hole 211 Align with the position of the sagging section of the upper left steel bar 111, the second steel beam screw hole 212 is aligned with the position of the sagging section of the upper right steel bar 121, the diameter of the first steel beam screw hole 211 and the second steel beam screw hole 212 is 2mm larger than the diameter of the screw; limit The positioning device 3 is arranged at all edges of the upper surface of the upper flange of the steel beam 2 by bonding or welding, and an open cavity is formed between the upper surface of the upper flange of the steel beam 2; With the same material, the height of the positioning device 3 is limited to 30mm.

The connector 5 is used to connect the upper left steel bar 111 or the upper right steel bar 121 and the screw 4; the connector 3 is made of high-strength material, and its inner hole thread matches the steel thread 13 at the lower end of the upper left steel bar 111 or the upper right steel bar 121.

The screw 4, the upper fixing device 41 and the lower fixing device 42 form a connecting device. The upper left steel bar 111 or the upper right steel bar is connected to the steel beam 121 through the connector 5. The upper and lower ends of the screw 4 have threads, the threads are the same, and the threads are the same as The internal control thread of the connector 5 is matched, and the screw rod 4 is made of high-strength material; the upper fixing device 41 and the lower fixing device 42 both include a washer and a nut, and the nut matches the thread on the screw rod and is made of high-strength materials.

The shearing member 6 is arranged on the upper surface of the upper flange of the steel beam 2 through a welding process; the shearing member 6 is preferably in the form of a stud; the material of the upper longitudinal reinforcement 7 and the lower longitudinal reinforcement 8 is respectively the same as that of the concrete left plate 11 and the concrete right plate. The upper and lower longitudinal reinforcements of 12 are the same, and the grouting material 9 is epoxy mortar. During prefabrication in the factory, the parts of the left concrete slab 11 and the right concrete slab 12 that are in contact with the grouting material 9 should use the grouting tape 10.

The manufacturing process of the novel tensile and shear-resistant steel-concrete composite beam structure of the present embodiment includes the following steps:

(1) Factory prefabricated

1.1) Prepare the concrete material, steel bar material, and stop tape for making the prefabricated slab;

1.2) According to the structure of the concrete slab in the drawings, the reinforcement bars are bound and the formwork is made, and the part of the concrete slab in contact with the grouting material should adopt the grouting tape;

1.3) The upper and lower steel bars of the two butt-jointed concrete slabs are staggered; the upper and lower steel bars of the concrete slabs are anchored, and the upper steel bars are formed into an "L" shape through a 90° cold bending process. After the lower steel bar passes through the 180° cold bending process, the end of the steel bar becomes an inverted "U" shape, and the end of the steel bar is downward, and the cold bending process is constructed according to the relevant standards;

1.4) Concrete pouring, curing and formwork removal, tear off the grout stop tape with regular irregularities on the surface to form all precast concrete panels;

1.5) Prepare the steel plate for making the steel beam blank, cut the steel plate, and form the steel beam with "I" or "H" or "T" or other shapes by welding;

1.6) Open steel beam screw holes on the upper flange of the steel beam, and the steel beam screw holes are aligned with the sagging position of the upper steel bar;

1.7) Carry out rust removal treatment on the upper surface of the steel girder, set a limiting positioning device around the upper surface of the upper flange of the steel girder, and form an upper opening cavity between the limiting positioning device and the upper surface of the upper flange of the steel girder;

1.8) Set shear connectors on the surface of the steel beam through the weld;

1.9) Sandblast the surface of the steel beam at the joint and the surface of the shear connector, and perform anti-corrosion and fire-proof treatment on other parts;

1.10) Manufacture or purchase screws, upper fixing devices, lower fixing devices and limiting positioning devices;

(2) On-site assembly

2.1) Transport the prefabricated steel beams and concrete slabs to the site, stack them reasonably, and wait for assembly;

2.2) Erect the steel beam on the support on the project site;

2.3) Use a torque wrench to connect the sagging section of the upper steel bar with the upper end of the screw rod through the connector. It is necessary to reach the torque specified in the relevant specifications of the steel bar connector, and the upper fixing device is placed on the screw rod, and the upper part is fixed by a temporary fixing method. The device is bonded to the screw;

2.4) Install the precast concrete slab on the steel beam by hoisting, and the precast concrete slab is in direct contact with the limiting positioning device to ensure that the lower end of each screw rod passes through the steel beam screw hole on the steel beam, and arranges it;

2.5) Connect the upper longitudinal steel bar, the lower longitudinal steel bar and the overhanging steel bar of the concrete slab into a whole by means of plate tying;

2.6) After the whole is stabilized, screw the upper fixing device to ensure that the upper fixing device is in close contact with the upper surface of the upper flange of the steel beam;

2.7) Pour the prepared grouting material (epoxy mortar) into the joint formed between the steel beam and the prefabricated board;

2.8) After solidification, pass the lower fixing device through the lower part of the screw, tighten it, and seal it with a sealing material to prevent corrosion.

Claims (9)

1. a steel-concrete composite beam structure of novel tensile shearing resistance, is characterized in that, described composite beam structure comprises concrete left slab, concrete right slab, steel beam, limiting positioning device, screw rod, upper fixing device, lower fixing device , connectors, shearing parts, upper longitudinal reinforcement, lower longitudinal reinforcement and grouting material, the shearing parts are connected to the upper surface of the upper flange of the steel beam, and the limiting positioning device is connected to the edge of the upper flange of the steel beam, so The limiting positioning device and the upper surface of the upper flange of the steel beam form an open cavity; the concrete left plate and the concrete right plate are connected to the The concrete left plate, the concrete right plate, the connector and the limiting positioning device are bonded together by the grouting material to form a new tensile-shear-resistant steel-concrete composite beam structure. 2. The steel-concrete composite beam structure of a novel tensile shear resistance as claimed in claim 1, wherein the left concrete slab comprises a concrete slab, a left upper steel bar and a left lower steel bar; the left upper steel bar and The lower left steel bar is the overhang part of a part of the upper transverse reinforcement bar and the lower transverse reinforcement bar in the reinforcement of the concrete slab, the reinforcement bar end of the left upper reinforcement bar is downward, and reinforcement threads are arranged at the end of the reinforcement bar; The concrete right slab comprises a concrete slab, a right upper reinforcement bar and a right lower reinforcement bar; the right upper reinforcement bar and the right lower reinforcement bar are the overhangs of a part of the upper transverse reinforcement bar and the lower right lower reinforcement bar in the reinforcement of the concrete slab, and the The reinforcing bar end of the upper right reinforcing bar is downward, and the reinforcing bar thread is set at the end of the reinforcing bar; The upper left reinforcement bar and the upper right reinforcement reinforcement are arranged in a staggered manner, the reinforcement thread of the upper left reinforcement reinforcement is threadedly connected to the upper end of one connector, and the reinforcement thread of the upper right reinforcement reinforcement is threadedly connected to the upper end of the other connector. 3. The steel-concrete composite beam structure of a new type of tensile shear resistance as claimed in claim 2, wherein the left upper steel bar comprises steel bars and steel threads, and the left upper steel bar is formed by a 90° cold bending process "L" shape, the end of the steel bar is downward, the steel bar thread is made at the end of the steel bar, and the cold bending process is constructed according to the relevant standards; After the steel bar in the lower left part passes through the 180° cold bending process, the end of the steel bar is in an inverted "U" shape, and the end of the steel bar is downward. 4. The steel-concrete composite beam structure of a new type of tensile shear resistance as claimed in claim 2, wherein the upper right steel bar comprises steel bars and steel threads, and the right upper steel bar is formed by a 90° cold bending process "L" shape, the end of the steel bar is downward, the steel bar thread is made at the end of the steel bar, and the cold bending process is constructed according to the relevant standards; After the lower right steel bar has passed the 180° cold bending process, the end of the steel bar is in an inverted "U" shape, and the end of the steel bar is downward, and the cold bending process is constructed according to relevant standards. 5. The novel tensile-shear-resistant steel-concrete composite beam structure according to any one of claims 1 to 4, wherein the steel beam is provided with a steel beam screw hole for the screw to pass through, so that the The steel beam screw hole includes 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 upper left steel bar, and the second steel beam screw hole is sagging with the upper right steel bar. Segment position alignment. 6 . The novel tensile and shear resistant steel-concrete composite beam structure according to claim 2 , wherein the connector is used to connect the left upper steel bar or the right upper steel bar and all the steel bars 6 . The screw, the inner hole thread is matched with the screw thread of the lower end 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 connection device, and the connection is made through the connection. The device connects the left upper steel bar or the right upper steel bar to the steel beam. 7. The steel-concrete composite beam structure of a new type of tensile shear resistance as claimed in claim 6, wherein the upper end and the lower end of the screw have threads, the threads are the same, and the threads are matched with the internal control threads of the connector, Both the upper fixing device and the lower fixing device comprise a washer and a nut, and the nut is matched with the thread on the screw rod. 8 . The novel tensile and shear-resistant steel-concrete composite beam structure according to claim 1 , wherein the limiting positioning device is disposed on the upper surface of the upper flange of the steel beam by means of bonding or welding. 9 . An open cavity is formed between all the edges of the steel beam and the upper surface of the upper flange of the steel beam. 9 . The novel tensile-shear-resistant steel-concrete composite beam structure according to claim 1 , wherein the shear-resistant member is disposed on the upper surface of the upper flange of the steel beam through a welding process. 10 .

Images