Primary and secondary beam joint structure of externally-wrapped U-shaped steel and concrete composite beam with built-in truss frame

Abstract

The utility model relates to a primary and secondary beam node structure of an externally-wrapped U-shaped steel and concrete composite beam with a built-in truss frame, which comprises a primary beam and a secondary beam, and the end part of the secondary beam is spliced with the side surface of the primary beam to form a node; the main beam comprises main beam externally-wrapped U-shaped steel and a main beam angle steel truss frame; the main beam outer wrapping U-shaped steel is provided with a main beam upper flange; a main beam connecting plate is further fixed at the node position of the main beam; the secondary beam has the same structure as the main beam; u-shaped short beams are correspondingly welded to the positions, at the joints, of the side faces of the main beams, and the ends of the secondary beams are placed in the short beams and fixedly connected through bolts. The top surface of the outer U-shaped steel of the main beam is flush with the top surface of the outer U-shaped steel of the secondary beam; the main beam connecting plate of the main beam and the secondary beam connecting plate of the secondary beam are welded into a whole in a butt joint mode. The upper flanges of the main beam and the secondary beam and the built-in angle steel truss frame are connected through the connecting plates, so that the node is rigid, the structural stress performance is good, the connecting method is simple, construction is convenient, and the technical blank of connection of the main beam and the secondary beam is filled.

Description

Technical Field

[0001] The utility model relates to the technical field of building engineering structures, in particular to a primary and secondary beam node structure of an outer U-shaped steel and concrete composite beam with a built-in truss frame. Background Art

[0002] Floor beams often utilize a primary-secondary beam system. The connection method for these primary-secondary beam nodes directly affects the force transmission efficiency of the primary-secondary beam connection and the stress characteristics of the beam. Common node connection methods are hinged joints and rigid joints. Rigid joints can simultaneously transmit shear forces and bending moments. The presence of negative bending moments at the beam ends reduces beam deflection, making the overall structure more stable. Compared to hinged joints, rigid joints are more suitable for use in long-span buildings.

[0003] Composite beams with U-shaped steel-concrete frames encased within internal angle steel trusses are suitable for use in large-span prefabricated projects due to their high load-bearing capacity, high rigidity, superior fire resistance, and high degree of factory production. However, there is currently no readily available method for connecting the primary and secondary beams of composite beams with U-shaped steel-concrete frames encased within internal angle steel trusses. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a main and secondary beam node structure of an outsourced U-shaped steel and concrete composite beam with a built-in truss frame. The upper flanges of the secondary beams on both sides of the main beam and the upper chords of the built-in angle steel truss frame are connected through connecting plates, so that the nodes are rigidly connected, the structural force performance is good, the connection method is simple, and the construction is convenient, filling the technical gap in the above-mentioned main and secondary beam connections.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a main and secondary beam node structure of an outer U-shaped steel and concrete composite beam with an internal truss frame, including a main beam and a secondary beam, and the end of the secondary beam is spliced with the side of the main beam to form a node;

[0006] The main beam includes a U-shaped steel outer surface of the main beam and a main beam angle steel truss frame located inside the U-shaped steel outer surface of the main beam; both sides of the top opening of the U-shaped steel outer surface of the main beam are also provided with an outward-turned main beam upper flange; the top surface of the main beam angle steel truss frame is flush with the top surface of the main beam upper flange; the main beam also includes a plurality of main beam upper connecting angle steels distributed along the length direction of the main beam; the main beam upper connecting angle steels are respectively fixedly connected to the top surface of the main beam angle steel truss frame and the top surface of the main beam upper flange; the main beam is also provided with a main beam connecting plate at the node position; the main beam connecting plate is respectively fixedly connected to the top surface of the main beam angle steel truss frame and the top surface of the main beam upper flange;

[0007] The secondary beam comprises a secondary beam outer-clad U-shaped steel and a secondary beam angle steel truss frame located within the secondary beam outer-clad U-shaped steel; both sides of the opening of the top surface of the secondary beam outer-clad U-shaped steel are further provided with outward-turned secondary beam upper flanges; the top surface of the secondary beam angle steel truss frame is flush with the top surface of the secondary beam upper flange; the secondary beam further comprises a plurality of secondary beam upper connecting angle steels distributed along the length direction of the secondary beam; the secondary beam upper connecting angle steels are respectively fixedly connected to the top surface of the secondary beam angle steel truss frame and the top surface of the secondary beam upper flange; the end of the secondary beam is further provided with a secondary beam connecting plate; the secondary beam connecting plate is respectively fixedly connected to the top surface of the main beam angle steel truss frame and the top surface of the main beam upper flange;

[0008] The side of the main beam is welded with a short beam at the corresponding node, and the short beam is U-shaped with an upper opening; the end of the secondary beam is placed in the short beam and fixedly connected by bolts; the top surface of the U-shaped steel wrapped around the main beam is flush with the top surface of the U-shaped steel wrapped around the secondary beam; the main beam connecting plate of the main beam and the secondary beam connecting plate of the secondary beam are butt-welded into one.

[0009] Furthermore, the bottom side of the lower flange of the secondary beam wrapped with the U-shaped steel is in close contact with the top side of the lower flange of the short beam; the bottom side of the upper flange of the secondary beam wrapped with the U-shaped steel is flush with the top side of the web of the short beam.

[0010] Furthermore, multiple rows of screw holes are provided on the web of the short beam, and corresponding screw holes are also provided on the web of the secondary beam wrapped with U-shaped steel; the bolts use the screw holes of the web of the short beam and the screw holes of the web of the secondary beam wrapped with U-shaped steel to fix the secondary beam and the short beam.

[0011] Furthermore, the main beam angle steel truss frame includes two pieces of first plane angle steel trusses, the first plane angle steel trusses include a first upper chord, a first lower chord, a first vertical web and a first diagonal web fixedly connected between the first upper chord and the first lower chord, and a plurality of first lower connecting rods are fixedly connected between the first lower chords of the two first plane angle steel trusses along the length direction of the main beam angle steel truss frame; the main beam upper connecting angle steel and the main beam connecting plate are respectively fixedly connected to the top surfaces of the first upper chords of the two first plane angle steel trusses.

[0012] Furthermore, the secondary beam angle steel truss frame includes two pieces of second plane angle steel trusses, the second plane angle steel trusses include a second upper chord, a second lower chord, a plurality of second vertical webs and a plurality of second diagonal webs fixedly connected between the second upper chord and the second lower chord, and a plurality of second lower connecting rods are fixedly connected between the second lower chords of the two pieces of second plane angle steel trusses along the length direction of the secondary beam angle steel truss frame; the secondary beam upper connecting angle steel and the secondary beam connecting plate are respectively fixedly connected to the top surfaces of the second upper chords of the two pieces of second plane angle steel trusses.

[0013] Furthermore, a first cutout is provided on the upper flange of the main beam of which the main beam is covered with U-shaped steel in the node area; the width of the first cutout is consistent with the width of the top side of the secondary beam of which the U-shaped steel is covered.

[0014] Furthermore, the secondary beam angle steel truss frame is framed at one end corresponding to the node, the ends of the second upper chord and the second lower chord of the two second plane angle steel trusses are vertically aligned, and the ends of the second upper chord and the second lower chord are fixedly connected by a second vertical web.

[0015] Furthermore, the upper flanges of the secondary beams on both sides of the secondary beams wrapped with U-shaped steel are provided with second cutouts in the node area; the depth of the second cutout is consistent with the width of the upper flange of the main beam on the corresponding side of the main beam wrapped with U-shaped steel.

[0016] Furthermore, the secondary beam angle steel truss frame is framed at one end corresponding to the node, and the end of the second upper chord and the end of the second lower chord of the two second plane angle steel trusses are fixedly connected by a second diagonal web, so as to make the end of the second upper chord avoid the area of the second cutout.

[0017] The beneficial effects of the present invention: the main and secondary beam node structure of the outsourced U-shaped steel and concrete composite beam of the built-in truss frame of the present invention connects the top side of the outsourced U-shaped steel of the main beam, the upper chord of the main beam angle steel truss frame and the top side of the outsourced U-shaped steel of the secondary beam, the upper chord of the secondary beam angle steel truss frame into one through the welding of the main beam connecting plate and the secondary beam connecting plate, and the two connecting plates transmit force through the butt weld; the web of the outsourced U-shaped steel of the secondary beam is connected to the web of the U-shaped short beam on the side of the main beam by bolts, so that the two beams form a continuous beam, the node is rigid and can effectively transmit negative bending moment, reduce the deflection of the beam, and the structural force is clear and reasonable, which is more suitable for prefabricated large-span projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional schematic diagram of the node structure of the main and secondary beams of the outer U-shaped steel and concrete composite beams of the built-in truss frame of Example 1;

[0019] Figure 2 A three-dimensional schematic diagram of the main beam angle steel truss frame of the main and secondary beam node structure of the built-in truss frame of the first embodiment;

[0020] Figure 3 A three-dimensional schematic diagram of a secondary beam angle steel truss frame of an externally wrapped U-shaped steel and concrete composite beam node structure of an internal truss frame of Example 1;

[0021] Figure 4 This is a schematic front view of the node structure of the main and secondary beams of the built-in truss frame and the outer U-shaped steel and concrete composite beams of the first embodiment;

[0022] Figure 5It is a right side schematic diagram of the node structure of the main and secondary beams of the outer U-shaped steel and concrete composite beams of the built-in truss frame of the first embodiment;

[0023] Figure 6 Schematic diagram of the coordination of the main beam outer-wrapped U-shaped steel and the secondary beam outer-wrapped U-shaped steel of the main and secondary beam node structure of the built-in truss frame and the concrete composite beam in Example 1;

[0024] Figure 7 A three-dimensional schematic diagram of the node structure of the main and secondary beams of the outer U-shaped steel and concrete composite beams of the built-in truss frame of the second embodiment;

[0025] Figure 8 Schematic diagram of the coordination of the main beam outer-wrapped U-shaped steel and the secondary beam outer-wrapped U-shaped steel of the main and secondary beam node structure of the built-in truss frame and the concrete composite beam in Example 2;

[0026] Figure 9 A perspective schematic diagram of a secondary beam angle steel truss frame of an externally wrapped U-shaped steel and concrete composite beam primary and secondary beam node structure of a built-in truss frame in Example 2;

[0027] Among them, 1-main beam, 2-secondary beam, 3-short beam, 11-main beam wrapped with U-shaped steel, 12-main beam angle steel truss frame, 13-main beam upper connecting angle steel, 14-main beam connecting plate, 111-main beam upper flange, 112-first section, 121-first upper chord, 122-first lower chord, 123-first vertical web, 124-first diagonal web, 125-first lower connecting rod, 21-secondary beam wrapped with U-shaped steel, 22-secondary beam angle steel truss frame, 23-secondary beam upper connecting angle steel, 24-secondary beam connecting plate, 211-secondary beam upper flange, 212-second section, 221-second upper chord, 222-second lower chord, 223-second vertical web, 224-second diagonal web, 225-second lower connecting rod, 31-bolt. DETAILED DESCRIPTION

[0028] In order to deepen the understanding of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0029] Example 1

[0030] Please refer to Figures 1 to 6As shown, this embodiment provides a main and secondary beam node structure of an outer U-shaped steel and concrete composite beam with a built-in truss frame, including a main beam 1 and a secondary beam 2, the end of the secondary beam 2 is spliced with the side of the main beam 1 to form a node; the main beam 1 includes a main beam outer U-shaped steel 11, and a main beam angle steel truss frame 12 located inside the main beam outer U-shaped steel 11; both sides of the top surface opening of the main beam outer U-shaped steel 11 also have outward-turned main beam upper flanges 111; the top surface of the main beam angle steel truss frame 12 is flush with the top surface of the main beam upper flange 111; the main beam 1 also includes a plurality of main beam connecting angle steels 13 distributed along the length direction of the main beam; the main beam connecting angle steels 13 are respectively fixedly connected to the top surface of the main beam angle steel truss frame 12 and the top surface of the main beam upper flange 111; the main beam 1 is also provided with a main beam connecting plate 14 at the node position; the main beam connecting plate 14 is respectively fixedly connected to the top surface of the main beam angle steel truss frame 12 and the top surface of the main beam upper flange 111; the secondary beam 2 has the same structure as the main beam 1, with only slight differences in size; specifically: the secondary beam 2 includes a secondary beam outer U The secondary beam 21 is provided with a secondary beam angle steel truss frame 22 in the secondary beam outer U-shaped steel 21; the upper surface of the secondary beam outer U-shaped steel 21 is provided with an outward-turned secondary beam upper flange 211 on both sides of the top opening; the top surface of the secondary beam angle steel truss frame 22 is flush with the top surface of the secondary beam upper flange 211; the secondary beam 2 also includes a plurality of secondary beam upper connecting angle steels 23 distributed along the length direction of the secondary beam; the secondary beam upper connecting angle steels 23 are respectively fixedly connected to the top surface of the secondary beam angle steel truss frame 22 and the top surface of the secondary beam upper flange 211; the end of the secondary beam 2 is also provided with A secondary beam connecting plate 24 is provided; the secondary beam connecting plate 24 is fixedly connected to the top surface of the main beam angle steel truss frame 12 and the top surface of the main beam upper flange 111 respectively; a short beam 3 is welded correspondingly at the node on the side of the main beam 1, and the short beam 3 is U-shaped with an upper opening; the end of the secondary beam 2 is placed in the short beam 3 and fixedly connected by bolts 31; the top surface of the main beam outer-clad U-shaped steel 11 is flush with the top surface of the secondary beam outer-clad U-shaped steel 21; the main beam connecting plate 14 of the main beam 1 and the secondary beam connecting plate 24 of the secondary beam 2 are butt-welded into one.

[0031] Refer again Figure 5 As shown, the bottom side of the lower flange of the secondary beam wrapped with the U-shaped steel 21 is in close contact with the top side of the lower flange of the short beam; the bottom side of the upper flange of the secondary beam wrapped with the U-shaped steel 21 is flush with the top side of the web of the short beam 3.

[0032] Refer again Figure 4 and Figure 5 As shown, the web of the short beam 3 is provided with multiple rows of screw holes, and the web of the secondary beam clad with the U-shaped steel 21 is also provided with corresponding screw holes. The bolts utilize the screw holes in the web of the short beam 3 and the screw holes in the web of the secondary beam clad with the U-shaped steel 21 to securely connect the secondary beam 2 to the short beam 3. It should be noted that the bottom side of the secondary beam 2 is not connected to the bottom side of the short beam 3.

[0033] Refer again Figure 2 As shown, the main beam angle steel truss frame 12 includes two first plane angle steel trusses, which include a first upper chord 121, a first lower chord 122, a first vertical web 123 and a first diagonal web 124 fixedly connected between the first upper chord 121 and the first lower chord 122. A plurality of first lower connecting rods 125 are fixedly connected between the first lower chords 122 of the two first plane angle steel trusses along the length direction of the main beam angle steel truss frame 12; the main beam upper connecting angle steel 13 and the main beam connecting plate 14 are respectively fixedly connected to the top surfaces of the first upper chords 121 of the two first plane angle steel trusses. In this embodiment, the first upper chord 121, the first lower chord 122, the first vertical web 123, the first diagonal web 124 and the first lower connecting rod 125 are all angle steels.

[0034] Refer again Figure 3 As shown, the secondary beam angle steel truss frame 22 includes two second plane angle steel trusses, which include a second upper chord 221, a second lower chord 222, a plurality of second vertical web members 223 and a plurality of second diagonal web members 224 fixedly connected between the second upper chord 221 and the second lower chord 222. A plurality of second lower connecting rods 225 are fixedly connected between the second lower chords 222 of the two second plane angle steel trusses along the length direction of the secondary beam angle steel truss frame 22; the secondary beam upper connecting angle steel 23 and the secondary beam connecting plate 24 are respectively fixedly connected to the top surfaces of the second upper chords 221 of the two second plane angle steel trusses. In this embodiment, the second upper chord 221, the second lower chord 222, the second vertical web members 223, the second diagonal web members 224, and the second lower connecting rod 225 are all angle steels.

[0035] Refer again Figure 6 As shown, the upper flange 111 of the main beam of the main beam outer-clad U-shaped steel 11 is provided with a first cutout 112 in the node area; the width of the first cutout 112 is consistent with the top side width of the secondary beam outer-clad U-shaped steel 12.

[0036] Refer again Figure 3 As shown, at one end of the secondary beam angle steel truss frame 22 corresponding to the node, the ends of the second upper chord 221 and the second lower chord 222 of the two second plane angle steel trusses are vertically aligned, and the end of the second upper chord 221 and the end of the second lower chord 222 are fixedly connected by a second vertical web 223.

[0037] Example 2

[0038] Please refer to Figures 7 to 9 As shown, this embodiment provides a primary and secondary beam node structure of an externally wrapped U-shaped steel and concrete composite beam with a built-in truss frame; the differences from the first embodiment are:

[0039] like Figure 8As shown, the secondary beam upper flanges 211 on both sides of the secondary beam outer-clad U-shaped steel 21 are both provided with second cutouts 212 in the node area; the depth of the second cutout 212 is consistent with the width of the main beam upper flange 111 on the corresponding side of the main beam outer-clad U-shaped steel 12.

[0040] like Figure 9 As shown, at one end of the secondary beam angle steel truss frame 22 corresponding to the node, the end of the second upper chord 221 and the end of the second lower chord 222 of the two second plane angle steel trusses are fixedly connected by a second diagonal web 224, which is used to make the end of the second upper chord 221 avoid the area of the second cutout 212.

[0041] The above embodiment has a main and secondary beam node structure of an outsourced U-shaped steel and concrete composite beam of a built-in truss frame; the main beam and the secondary beam are processed according to the selected section type, and then the main beam and the secondary beam are assembled separately; when splicing is required, a short beam is welded to the side of the main beam through a fillet weld as required, and the corresponding end of the secondary beam is placed in the short beam and fixed by bolts; then, the secondary beam connecting plate of the secondary beam and the main beam connecting plate of the main beam are welded into one in the form of a butt weld, that is, the connection of the main and secondary beam nodes is realized, and finally, concrete is poured to form the outsourced U-shaped steel and concrete composite beam of the built-in truss frame.

[0042] The above embodiments should not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent conversion fall within the protection scope of the present invention.

Claims

1. The node structure of the main and secondary beams of the built-in truss frame with an external U-shaped steel and concrete composite beam is characterized by: It includes a main beam and a secondary beam, where the ends of the secondary beam are spliced with the sides of the main beam to form a node; The main beam includes a U-shaped steel outer surface of the main beam and a main beam angle steel truss frame located inside the U-shaped steel outer surface of the main beam; both sides of the top opening of the U-shaped steel outer surface of the main beam are also provided with an outward-turned main beam upper flange; the top surface of the main beam angle steel truss frame is flush with the top surface of the main beam upper flange; the main beam also includes a plurality of main beam upper connecting angle steels distributed along the length direction of the main beam; the main beam upper connecting angle steels are respectively fixedly connected to the top surface of the main beam angle steel truss frame and the top surface of the main beam upper flange; the main beam is also provided with a main beam connecting plate at the node position; the main beam connecting plate is respectively fixedly connected to the top surface of the main beam angle steel truss frame and the top surface of the main beam upper flange; The secondary beam comprises a secondary beam outer-clad U-shaped steel and a secondary beam angle steel truss frame located within the secondary beam outer-clad U-shaped steel; both sides of the opening of the top surface of the secondary beam outer-clad U-shaped steel are further provided with outward-turned secondary beam upper flanges; the top surface of the secondary beam angle steel truss frame is flush with the top surface of the secondary beam upper flange; the secondary beam further comprises a plurality of secondary beam upper connecting angle steels distributed along the length direction of the secondary beam; the secondary beam upper connecting angle steels are respectively fixedly connected to the top surface of the secondary beam angle steel truss frame and the top surface of the secondary beam upper flange; the end of the secondary beam is further provided with a secondary beam connecting plate; the secondary beam connecting plate is respectively fixedly connected to the top surface of the main beam angle steel truss frame and the top surface of the main beam upper flange; The side of the main beam is welded with a short beam at the corresponding node, and the short beam is U-shaped with an upper opening; the end of the secondary beam is placed in the short beam and fixedly connected by bolts; the top surface of the U-shaped steel wrapped around the main beam is flush with the top surface of the U-shaped steel wrapped around the secondary beam; the main beam connecting plate of the main beam and the secondary beam connecting plate of the secondary beam are butt-welded into one.

2. The node structure of the main and secondary beams of the outer U-shaped steel and concrete composite beams with an internal truss frame according to claim 1 is characterized by: The bottom side of the lower flange of the secondary beam wrapped with U-shaped steel is in close contact with the top side of the lower flange of the short beam; the bottom side of the upper flange of the secondary beam wrapped with U-shaped steel is flush with the top side of the web of the short beam.

3. The node structure of the primary and secondary beams of the outer U-shaped steel and concrete composite beams with an internal truss frame according to claim 2 is characterized by: The web of the short beam is provided with multiple rows of screw holes, and the web of the secondary beam wrapped with U-shaped steel is also provided with corresponding screw holes; the bolts use the screw holes of the web of the short beam and the screw holes of the web of the secondary beam wrapped with U-shaped steel to fix the secondary beam and the short beam.

4. The node structure of the primary and secondary beams of the outer U-shaped steel and concrete composite beams with an internal truss frame according to claim 1 is characterized by: The main beam angle steel truss frame includes two first plane angle steel trusses, the first plane angle steel trusses include a first upper chord, a first lower chord, a first vertical web and a first diagonal web fixedly connected between the first upper chord and the first lower chord, and a plurality of first lower connecting rods are fixedly connected between the first lower chords of the two first plane angle steel trusses along the length direction of the main beam angle steel truss frame; the main beam upper connecting angle steel and the main beam connecting plate are respectively fixedly connected to the top surfaces of the first upper chords of the two first plane angle steel trusses.

5. The node structure of the main and secondary beams of the outer U-shaped steel and concrete composite beams with an internal truss frame according to claim 4 is characterized by: The secondary beam angle steel truss frame includes two pieces of second plane angle steel trusses, the second plane angle steel trusses include a second upper chord, a second lower chord, a plurality of second vertical webs and a plurality of second diagonal webs fixedly connected between the second upper chord and the second lower chord, a plurality of second lower connecting rods are fixedly connected between the second lower chords of the two pieces of second plane angle steel trusses along the length direction of the secondary beam angle steel truss frame; the secondary beam upper connecting angle steel and the secondary beam connecting plate are respectively fixedly connected to the top surfaces of the second upper chords of the two pieces of second plane angle steel trusses.

6. The node structure of the primary and secondary beams of the outer U-shaped steel and concrete composite beams with an internal truss frame according to claim 5 is characterized by: The upper flange of the main beam of the main beam wrapped with U-shaped steel is provided with a first cutout in the node area; the width of the first cutout is consistent with the top side width of the secondary beam wrapped with U-shaped steel.

7. The node structure of the primary and secondary beams of the built-in truss frame with an externally wrapped U-shaped steel and concrete composite beam according to claim 6, characterized in that: The secondary beam angle steel truss frame is at one end corresponding to the node, the ends of the second upper chord and the second lower chord of the two second plane angle steel trusses are vertically aligned, and the ends of the second upper chord and the second lower chord are fixedly connected by a second vertical web.

8. The node structure of the primary and secondary beams of the outer U-shaped steel and concrete composite beams with an internal truss frame according to claim 5 is characterized by: The upper flanges of the secondary beams on both sides of the secondary beam wrapped with U-shaped steel are both provided with second cutouts in the node area; the depth of the second cutout is consistent with the width of the upper flange of the main beam on the corresponding side of the main beam wrapped with U-shaped steel.

9. The node structure of the main and secondary beams of the outer U-shaped steel and concrete composite beams with an internal truss frame according to claim 8, characterized in that: The secondary beam angle steel truss frame is located at one end corresponding to the node, and the end of the second upper chord and the end of the second lower chord of the two second plane angle steel trusses are fixedly connected by a second diagonal web member, so as to make the end of the second upper chord avoid the area of the second cutout.

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