Steel-concrete composite beam

Abstract

The utility model relates to the technical field of bridge structures, in particular to a steel-concrete composite beam. According to the technical scheme, the combined beam comprises a flange and two transverse plates installed on the upper side and the lower side of the flange, and the outer side of the combined beam is provided with a positioning type environment-resistant assembly which carries out corresponding supporting according to the thermal expansion and cold contraction state of concrete. When the concrete assembly is in a thermal expansion state, the hollow screw rod wrapped by concrete expands outwards synchronously, the arc-shaped inner wall of the arc-shaped limiting groove generates resistance to the clamping cylinder, then the outward moving range of the hollow screw rod is reduced, and when the concrete assembly is in a cold contraction state, the whole concrete assembly shrinks inwards, so that the hollow screw rod is prevented from moving outwards. The hollow screw rod is extruded downwards under pressure, and the annular push block extrudes the sealing air bag block to improve the sealing performance, so that the stability of the steel beam in the cold contraction state is improved, and the connecting position of the steel beam is prevented from loosening.

Description

Technical Field

[0001] This utility model relates to the field of bridge structure technology, and in particular to a steel-concrete composite beam. Background Technology

[0002] In high-rise buildings, steel-concrete composite beams can serve as the main load-bearing components of the floor system, bearing the floor load and transferring it to vertical components such as columns and walls. The installation methods for the connection components of steel-concrete composite beams mainly include welding, bolting, and shear connection. Bolted and shear connections may be affected by environmental factors during use, such as moisture and corrosion, which can cause the connection components to rust, affecting the strength and reliability of the connection. Regular inspection and maintenance of the connection components are required, and any rust should be treated promptly.

[0003] The patent document with publication number CN113550445A discloses a longitudinal connection structure for steel beams, a steel-concrete composite beam, and a construction method. The longitudinal connection structure of the upper flange of the steel beams allows one end of the fixing connector to pass through the first and second mounting holes to fix two adjacent steel beams. The other end extends out of the first mounting hole and into the concrete, and an additional nut is screwed on the end to enhance the shear and pull-out resistance between the concrete and the steel beams, ensuring that the connection and stress between the steel beams and the concrete meet the requirements.

[0004] When the above devices are in use, the fixed connectors are used to improve the stability of the steel beam. However, since the main body of the steel-concrete composite beam is concrete, it is more prone to relative displacement with the steel beam due to the effects of thermal expansion and contraction. This can cause the threaded connections of the steel beam to loosen, and air can easily enter the connection between the two, causing the threads to age and affecting the overall installation quality of the steel beam. At the same time, excessive expansion of concrete can create gaps between it and the steel beam, accelerating the collapse of the concrete and compromising its safety.

[0005] Therefore, this application proposes a steel-concrete composite beam. Utility Model Content

[0006] The purpose of this invention is to address the problems in the background art where steel-concrete composite beams, being primarily made of concrete, are prone to relative displacement with the steel beams due to thermal expansion and contraction. This can lead to loosening of the threaded connections in the steel beams, allowing air to enter the connection and causing thread aging, thus affecting the overall installation quality of the steel beams. Furthermore, excessive expansion of the concrete can create gaps between the concrete and the steel beams, accelerating concrete deterioration and compromising concrete safety. This invention proposes a steel-concrete composite beam and its installation method.

[0007] On the one hand, this utility model provides a steel-concrete composite beam, including a composite beam, the composite beam including a flange and two transverse plates installed on the upper and lower sides of the flange, and a positioning environmental resistance component installed on the outer side of the composite beam to provide corresponding support according to the thermal expansion and contraction of concrete.

[0008] A corresponding mounting ring is welded to the outer side of the cross plate, and the corresponding mounting ring is configured to communicate with the flange.

[0009] The positioning-type environmental protection component includes an upper internal thread formed on the inner wall of a corresponding mounting ring and a flange. A hollow threaded slide rod is connected to the internal thread of the upper internal thread. A hollow screw is slidably connected to the inner wall of the corresponding mounting ring via a slide rail. The outer side of the hollow threaded slide rod is threaded to the inner wall of the hollow screw via a threaded slideway. A positioning cylinder is slidably connected to the outer side of the threaded slideway. An annular push block is fixedly connected to the outer side of the positioning cylinder. The annular push block is fixedly installed at the bottom of the hollow screw. Multiple engaging cylinders are fixedly connected to the side of the annular push block away from the positioning cylinder. A sealing airbag block is fixedly connected to the inner wall of the corresponding mounting ring. A hollow pressure ring is fixedly connected to the side of the sealing airbag block facing the annular push block. The surface of the hollow pressure ring is provided with multiple arc-shaped limiting grooves to prevent the engaging cylinders from sliding outward. A limiting stop block is fixedly connected above the upper internal thread of the corresponding mounting ring.

[0010] Optionally, the transverse plate located below the flange has a lower internal thread communicating with the flange, and the lower internal thread and the upper internal thread are equidistant.

[0011] Optionally, the composite beam may also include a plurality of bolts threaded inside the flange and the cross plate.

[0012] Optionally, the outer side of the flange is threaded with multiple shear connectors, and the multiple shear connectors are arranged proportionally with respect to the flange surface, and a vertical steel beam block is fixedly installed on one side of the flange.

[0013] Optionally, a concrete assembly is installed on the outer side of the composite beam, and two sets of crossbeam stress transmission assemblies are installed below the concrete assembly. The two sets of crossbeam stress transmission assemblies are fixedly installed on both sides of the composite beam.

[0014] Optionally, the concrete component includes concrete, which is fixedly installed directly above the flange. Two sets of non-penetrating double bolt positioning holes are provided on the outer side of the concrete, and a corresponding rotating hole is provided between the two sets of double bolt positioning holes.

[0015] Optionally, a torque positioning post is fixedly connected inside the corresponding rotating hole, an auxiliary spring is attached to the outside of the torque positioning post, and two limiting blocks for limiting the rotational position of the torque positioning post are fixedly connected to the inner wall of the auxiliary spring.

[0016] Optionally, the beam stress transmission assembly includes a first threaded post and a second threaded post fixedly installed inside two double bolt positioning holes. The bottom of the first threaded post is threadedly connected to a beam stress transmission plate, and the second threaded post is threadedly connected above the beam stress transmission plate. The first threaded post and the second threaded post have a height difference in their installation heights on the beam stress transmission plate.

[0017] Optionally, the crossbeam stress transmission plate has a second reinforcing bar mounting hole and a first reinforcing bar mounting hole set at a height difference on one side, the crossbeam stress transmission plate has a first transmission groove on the side of the second reinforcing bar mounting hole, and the crossbeam stress transmission plate has a second transmission groove on the side of the first reinforcing bar mounting hole.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. When the concrete component undergoes thermal expansion, the hollow screw encased in concrete also expands outward simultaneously. The arc-shaped inner wall of the arc-shaped limiting groove creates resistance to the locking cylinder, thereby reducing the outward movement range of the hollow screw. When the concrete component undergoes thermal contraction, the entire concrete component contracts inward, and the hollow screw is compressed downward under pressure. The annular push block not only compresses the sealing airbag block to improve sealing, but also improves the stability of the steel beam in the thermal contraction state, preventing loosening at the steel beam connection.

[0020] 2. When the corresponding rotating hole drives the torsion positioning column to rotate relative to each other, the auxiliary spring rotates to the limit block, and the limit block generates relative spring torque, which buffers the external pressure and causes the concrete or steel beam to expand and contract within a controllable range, thus extending the life and stability of the steel beam concrete structure.

[0021] 3. Reinforcing bars are installed in the first and second transmission channels. When the concrete shakes relative to each other, the forces on the upper right side and the lower left side of the steel beam are transmitted to the vertical steel beam block, reducing the external pressure on the concrete and thus improving the overall stability of the concrete by utilizing the supporting force of the steel beam. Attached Figure Description

[0022] Figure 1 A structural schematic diagram of the steel-concrete composite beam of this utility model is provided;

[0023] Figure 2 A structural schematic diagram of the concrete of this utility model is provided;

[0024] Figure 3 This is a schematic diagram of the corresponding rotating hole structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the first threaded post of this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the first rebar installation hole of this utility model;

[0027] Figure 6 This is a schematic diagram of the steel beam structure of this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the sealing airbag block of this utility model;

[0029] Figure 8 This is a utility model Figure 7 Enlarged view of region A in the middle;

[0030] Figure 9 This is a schematic diagram of the arc-shaped limiting groove of this utility model.

[0031] Reference numerals: 1. Concrete component; 101. Corresponding rotating hole; 102. Concrete; 103. Double bolt positioning hole; 2. Beam stress transmission component; 201. Beam stress transmission plate; 202. First rebar installation hole; 203. Second rebar installation hole; 204. Torsion positioning post; 205. Limiting block; 206. Auxiliary spring; 207. First threaded post; 208. Second threaded post; 3. Composite beam; 301. Flange; 302. Shear connector; 3 03. Bolt; 304. Corresponding mounting ring; 305. Vertical steel beam block; 306. Horizontal plate; 4. Positioning environmentally resistant component; 401. Hollow screw; 402. Upper internal thread; 403. Lower internal thread; 404. Hollow threaded slide bar; 405. Threaded slide; 406. Sealing airbag block; 407. Annular push block; 408. Limiting block; 409. Positioning cylinder; 410. Arc-shaped limiting groove; 411. Hollow pressure ring; 412. Engaging cylinder. Detailed Implementation

[0032] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1-4 As shown, the present invention proposes a steel-concrete composite beam, including a composite beam 3, which includes a flange 301 and two horizontal plates 306 installed on the upper and lower sides of the flange 301. The outer side of the composite beam 3 is equipped with a positioning anti-environment component 4 that provides corresponding support according to the thermal expansion and contraction of the concrete.

[0034] The concrete component 1 includes concrete 102, which is fixedly installed directly above the flange 301. Two sets of non-penetrating double bolt positioning holes 103 are provided on the outer side of the concrete 102. A corresponding rotating hole 101 is provided between the two sets of double bolt positioning holes 103 on the concrete 102. Both the corresponding rotating hole 101 and the double bolt positioning holes 103 will be covered by concrete later to achieve complete installation.

[0035] like Figures 1-5 As shown, a torque positioning post 204 is fixedly connected inside the corresponding rotating hole 101. An auxiliary spring 206 is attached to the outside of the torque positioning post 204. When the concrete 102 is heated and expands or contracts, the internal air pressure drives the auxiliary spring 206 to move accordingly, so that the torque positioning post 204 is always attached to the auxiliary spring 206. Two limiting blocks 205 are fixedly connected to the inner wall of the auxiliary spring 206 to limit the rotation position of the torque positioning post 204. The crossbeam stress transmission assembly 2 includes a first threaded post 207 and a second threaded post 208 fixedly installed inside the two double bolt positioning holes 103. The bottom of the first threaded post 207 is threadedly connected to the crossbeam stress transmission plate 201, and the second threaded post 208 is threadedly connected above the crossbeam stress transmission plate 201. There is a height difference between the installation height of the first threaded column 207 and the second threaded column 208 on the stress transmission plate 201 of the beam. When the concrete is subjected to external pressure and undergoes slight deformation or thermal expansion and contraction, the pressure transmission first threaded column 207 located on the upper left side of the stress transmission plate 201 of the beam and the pressure transmission second threaded column 208 located on the lower right side of the stress transmission plate 201 of the beam can transmit the relative torsional force on both sides to the torsion positioning column 204. When the corresponding rotating hole 101 drives the torsion positioning column 204 to undergo relative torsion, the auxiliary spring 206 rotates to the limit block 205. The limit block 205 generates relative spring torsion, thereby buffering the external pressure. At the same time, it causes the concrete or steel beam to undergo thermal expansion and contraction within a controllable range, extending the life and stability of the steel beam concrete structure.

[0036] The crossbeam stress transmission plate 201 has a second reinforcing bar installation hole 203 and a first reinforcing bar installation hole 202 set at different heights on one side. The crossbeam stress transmission plate 201 has a first transmission groove on the side of the second reinforcing bar installation hole 203 and a second transmission groove on the side of the first reinforcing bar installation hole 202. The workers first insert the first reinforcing bar into the two sets of second reinforcing bar installation holes 203 and first reinforcing bar installation holes 202 for fixation. The second reinforcing bar is installed in the first transmission groove and the second transmission groove. When the concrete shakes relative to each other, the force on the upper right side of the steel beam and the force on the lower left side are transmitted to the vertical steel beam block 305, reducing the external pressure on the concrete. Thus, the stability of the entire concrete is improved by utilizing the supporting force of the steel beam.

[0037] like Figures 1-8 As shown, the interior of the horizontal plate 306 located below the flange 301 has a lower internal thread 403 communicating with the flange 301, and the lower internal thread 403 and the upper internal thread 402 are equidistantly arranged. Two sets of positioning environmental protection components 4 are included; one set connects to the upper internal thread 402, and the other set connects to the lower internal thread 403, improving the sealing of the connection between the horizontal plate 306 and the flange 301 and preventing airflow from accelerating the aging of the threaded grooves. The composite beam 3 also includes... Multiple bolts 303 are threadedly installed inside the flange 301 and the cross plate 306. Multiple shear connectors 302 are threadedly connected to the outer side of the flange 301, and these shear connectors 302 are arranged proportionally about the surface of the flange 301. A vertical steel beam block 305 is fixedly installed on one side of the flange 301. Positioning environmentally resistant components 4 are provided as required to achieve an effective connection between the flange 301 and the concrete component 1 at the joint, compensating for the deficiency of insufficient force transmission due to the absence of shear connectors 302 at this location. To ensure the connection force requirements between adjacent flanges 301, bolts 303 are also provided on the cross plate 306 and the flange 301.

[0038] In this embodiment, as Figures 6-9 As shown, a corresponding mounting ring 304 is welded to the outer side of the horizontal plate 306, and the corresponding mounting ring 304 is configured to communicate with the flange 301.

[0039] The positioning-type environmental protection component 4 includes an upper internal thread 402 formed on the inner wall of the corresponding mounting ring 304 and the flange 301. A hollow threaded slide rod 404 is internally threaded to the upper internal thread 402. A hollow screw rod 401 is slidably connected to the inner wall of the corresponding mounting ring 304 via a slide rail. The outer side of the hollow threaded slide rod 404 is threaded to the inner wall of the hollow screw rod 401 via a threaded slide rail 405. A positioning cylinder 409 is slidably connected to the outer side of the threaded slide rail 405. An annular push block 407 is fixedly connected to the outer side of the positioning cylinder 409. The annular push block 407 is fixedly installed at the bottom of the hollow screw rod 401. Multiple clips are fixedly connected to the side of the annular push block 407 away from the positioning cylinder 409. A sealing airbag block 406 is fixedly connected to the inner wall of the cylindrical body 412 and the corresponding mounting ring 304. A hollow pressure ring 411 is fixedly connected to the side of the sealing airbag block 406 facing the annular push block 407. The surface of the hollow pressure ring 411 is provided with multiple arc-shaped limiting grooves 410 to prevent the cylindrical body 412 from sliding outward. A limiting stop block 408 is fixedly connected above the upper internal thread 402 of the corresponding mounting ring 304. During initial installation, the worker threaded the hollow screw 401 and the hollow threaded slide bar 404 into the flange 301 and the corresponding mounting ring 304. The diameter of the annular push block 407 is larger than the normal inner diameter of the hollow pressure ring 411 and the sealing airbag block 406, and the annular push block 407... 07. Slide into the lower inner wall of the arc-shaped limiting groove 410. As the annular pusher 407 is inserted into the corresponding mounting ring 304, the hollow pressure ring 411 and the sealing airbag block 406 are pressed tightly against the inner wall of the corresponding mounting ring 304, improving the sealing performance between the hollow threaded slide rod 404 and the corresponding mounting ring 304, preventing external air from entering the threaded area and causing aging of the threaded area. At the same time, when the concrete component 1 is in a state of thermal expansion, the concrete component 1 expands outward as a whole due to heat, and the hollow screw rod 401 it encloses also expands outward synchronously. The arc-shaped inner wall of the arc-shaped limiting groove 410 generates resistance against the engaging cylinder 412, thereby reducing the outward movement range of the hollow screw rod 401, and also reducing the concrete... The expansion due to heat reduces the gap between the hollow screw 401 and the threaded area and the concrete, preventing aging at the steel beam connection. When the concrete component 1 is in a state of cold contraction, the entire concrete component 1 shrinks inward, and the hollow screw 401 is pressed downward. In addition to compressing the sealing airbag block 406 to improve the sealing performance, the annular push block 407 also compresses the sealing airbag block 406 to improve the sealing performance. At the same time, when the hollow threaded slide rod 404 moves downward along the slide rail of the corresponding mounting ring 304, the positioning cylinder 409 makes threaded contact with the hollow threaded slide rod 404. The sliding friction between the two causes the hollow threaded slide rod 404 to continue to rotate, making it more tightly connected with the upper built-in thread 402. This improves the stability of the steel beam in the state of cold contraction and prevents the steel beam connection from loosening.

[0040] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A steel-concrete composite beam, comprising a composite beam (3), said composite beam (3) including a flange (301) and two transverse plates (306) installed on the upper and lower sides of the flange (301), characterized in that: The outer side of the composite beam (3) is equipped with a positioning environmental protection component (4) that provides corresponding support according to the thermal expansion and contraction of concrete. A corresponding mounting ring (304) is welded to the outer side of the horizontal plate (306), and the corresponding mounting ring (304) is configured to communicate with the flange (301). The positioning-type environmentally resistant component (4) includes an upper internal thread (402) formed on the inner wall of the corresponding mounting ring (304) and the flange (301). The inner thread of the upper internal thread (402) is connected to a hollow threaded slide rod (404). The inner wall of the corresponding mounting ring (304) is slidably connected to a hollow screw rod (401) via a slide rail. The outer side of the hollow threaded slide rod (404) is threadedly connected to the inner wall of the hollow screw rod (401) via a threaded slide rail (405). A positioning cylinder (409) is slidably connected to the outer side of the threaded slide rail (405). An annular push block (407) is fixedly connected to the outer side of the positioning cylinder (409). 07) Fixedly installed at the bottom of the hollow screw (401), the annular push block (407) is fixedly connected to a plurality of engaging cylinders (412) on the side away from the positioning cylinder (409), the inner wall of the corresponding mounting ring (304) is fixedly connected to a sealing airbag block (406), the side of the sealing airbag block (406) facing the annular push block (407) is fixedly connected to a hollow pressure ring (411), the surface of the hollow pressure ring (411) is provided with a plurality of arc-shaped limiting grooves (410) for preventing the engaging cylinders (412) from sliding outward, and the corresponding mounting ring (304) is fixedly connected to a limiting stop (408) above the upper internal thread (402).

2. A steel-concrete composite beam according to claim 1, characterized in that, The interior of the horizontal plate (306) located below the flange (301) is provided with a lower internal thread (403) that communicates with the flange (301), and the lower internal thread (403) and the upper internal thread (402) are arranged at equal intervals.

3. A steel-concrete composite beam according to claim 2, characterized in that, The composite beam (3) also includes a plurality of bolts (303) threaded inside the flange (301) and the cross plate (306).

4. A steel-concrete composite beam according to claim 3, characterized in that, The outer side of the flange (301) is threaded with a plurality of shear connectors (302), and the plurality of shear connectors (302) are arranged in equal proportions with respect to the surface of the flange (301). A vertical steel beam block (305) is fixedly installed on one side of the flange (301).

5. A steel-concrete composite beam according to claim 4, characterized in that, A concrete component (1) is installed on the outside of the composite beam (3), and two sets of crossbeam stress transmission components (2) are installed below the concrete component (1). The two sets of crossbeam stress transmission components (2) are fixedly installed on both sides of the composite beam (3).

6. A steel-concrete composite beam according to claim 5, characterized in that, The concrete component (1) includes concrete (102), which is fixedly installed directly above the flange (301). Two sets of non-penetrating double bolt positioning holes (103) are provided on the outer side of the concrete (102), and a corresponding rotating hole (101) is provided between the two sets of double bolt positioning holes (103) in the concrete (102).

7. A steel-concrete composite beam according to claim 6, characterized in that, A torque positioning post (204) is fixedly connected inside the corresponding rotating hole (101). An auxiliary spring (206) is attached to the outside of the torque positioning post (204). Two limiting blocks (205) for limiting the rotation position of the torque positioning post (204) are fixedly connected to the inner wall of the auxiliary spring (206).

8. A steel-concrete composite beam according to claim 7, characterized in that, The beam stress transmission assembly (2) includes a first threaded post (207) and a second threaded post (208) fixedly installed inside two double bolt positioning holes (103). The bottom of the first threaded post (207) is threadedly connected to the beam stress transmission plate (201), and the second threaded post (208) is threadedly connected above the beam stress transmission plate (201). The first threaded post (207) and the second threaded post (208) have a height difference on the beam stress transmission plate (201).

9. A steel-concrete composite beam according to claim 8, characterized in that, The crossbeam stress transmission plate (201) has a second reinforcing bar installation hole (203) and a first reinforcing bar installation hole (202) set at a height difference on one side. The crossbeam stress transmission plate (201) has a first transmission groove on the side of the second reinforcing bar installation hole (203) and a second transmission groove on the side of the first reinforcing bar installation hole (202).

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