CN219671864U

CN219671864U - U-shaped steel and concrete composite beam

Info

Publication number: CN219671864U
Application number: CN202320196522.8U
Authority: CN
Inventors: 杨峰; 俞锋波; 耿俊迪; 裴麾
Original assignee: Ningbo Excellent Building Technology Co ltd
Current assignee: Ningbo Excellent Building Technology Co ltd
Priority date: 2023-02-08
Filing date: 2023-02-08
Publication date: 2023-09-12
Anticipated expiration: 2033-02-08

Abstract

The utility model provides a U-shaped steel and concrete composite beam, includes double web, top flange, bottom plate and concrete, the double web comprises two vertical steel sheets, and two vertical steel sheets lower extreme have been welded the bottom plate forms the U-shaped cavity, the lateral surface of double web has welded a plurality of U-shaped steel corbels, the lower part in the U-shaped steel corbel the double web is opened there is the through-hole, the top flange weld respectively in two vertical steel sheet upside, two the drawknot spare that the longitudinal interval has been welded between the top flange, the concrete fill in the U-shaped cavity with the top flange upside certain thickness. The composite beam has good torsion resistance in the construction stage, and the web plate of the U-shaped steel and concrete composite beam is provided with holes, so that the concrete beam placed on the U-shaped steel and concrete composite beam forms a continuous beam, the bracket of the composite beam not only serves as a placing surface for placing the beam, but also plays a role of a stiffening plate, and external bulging is prevented when concrete is poured.

Description

U-shaped steel and concrete composite beam

Technical Field

The utility model relates to the field of building structures, in particular to a U-shaped steel and concrete composite beam.

Background

The steel beam in the traditional steel structure building generally adopts H-shaped steel, has the problems of poor fireproof performance, poor torsional performance, poor web stability and the like, and in order to solve the problems, a U-shaped steel and inner concrete pouring structure is adopted to form a combined beam as a main beam of the building structure, but in the construction stage, because a drawknot piece is not arranged on the upper part and stiffening ribs are not arranged on the side wall of the U-shaped steel, when the inner concrete of the beam is poured under the condition of large beam height, the problem of U-shaped steel outer drum caused by large lateral pressure exists. In the prior art, corrugated steel plates are adopted as the composite girder webs, and although the lateral rigidity of the steel plates is improved when concrete is poured, the shelving beams connected with the corrugated steel plates can only be steel secondary beams, are not suitable for shelving connection with concrete components such as precast concrete secondary beams or precast concrete double-girder plates, or the shelving secondary beams after connection can not form continuous beams. U-shaped steel and concrete composite beams with steel corbels, web openings and good torsional performance in construction stage are not reported.

Disclosure of Invention

The utility model aims to solve the technical problem of overcoming the defects in the prior art and providing a U-shaped steel and concrete composite beam.

The utility model provides a U-shaped steel and concrete composite beam, which comprises a double web plate, an upper flange, a bottom plate and concrete, wherein the double web plate consists of two vertical steel plates, the lower ends of the two vertical steel plates are welded with the bottom plate to form a U-shaped cavity, the outer side surface of the double web plate is welded with a plurality of U-shaped steel corbels, the double web plate at the inner lower part of the U-shaped steel corbels is provided with through holes, the upper flange is respectively welded on the upper sides of the two vertical steel plates, drawknot pieces are welded between the two upper flanges at a certain distance in the longitudinal direction, and the concrete is filled in the U-shaped cavity and the upper side of the upper flange by a certain thickness.

The upper flange is of a variable cross section, and the widths of the two ends of the upper flange are larger than those of the midspan.

Shear nails are arranged on the upper surface of the upper flange at intervals.

And the inner side of the double web plate is welded with a through-length horizontal stiffening plate.

And prestressed reinforcement is embedded in the concrete.

The concrete is provided with a hogging moment reinforcing steel bar and stirrups near the upper part of the support.

And the lower side of the U-shaped steel bracket is welded with a vertical stiffening rib.

The drawknot piece is channel steel or angle steel.

Compared with the prior art, the U-shaped steel and concrete composite beam provided by the utility model has the following advantages:

1. the web plate of the U-shaped steel and concrete composite beam is perforated, so that the concrete beam placed on the web plate is formed into a continuous beam;

2. the bracket of the combined beam not only serves as a resting surface for resting the beam, but also plays a role of a stiffening plate, and the horizontal stiffening rib is combined to prevent the outer drum during concrete pouring, so that the thickness of the web plate is reduced;

3. the U-shaped composite beam has good torsion resistance in the construction stage.

4. The drawknot piece is used as a tensile stress component when concrete is poured and rammed and is also used as a shearing resistant piece for the combined action of the concrete and the steel beam.

Drawings

Fig. 1 is a three-dimensional schematic view of a composite beam of the present utility model.

Fig. 2 is a plan view of the composite girder of the present utility model.

Fig. 3 is a plan view of the composite beam of the present utility model with prestressed reinforcement and end shear stirrups.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Referring to fig. 1 to 3, in the embodiment of the U-shaped steel and concrete composite beam provided by the utility model, the beam comprises a double web 1, an upper flange 3, a bottom plate 2 and concrete 4, wherein the double web 1 is composed of two vertical steel plates, the bottom plate 2 is welded at the lower ends of the two vertical steel plates 11 to form a U-shaped cavity 12, a plurality of U-shaped steel corbels 13 are welded at the outer side surface of the double web 1, through holes 14 are formed in the double web 1 at the inner lower part of the U-shaped steel corbels 13, the upper flange 3 is respectively welded at the upper sides of the two vertical steel plates 11, drawknot pieces 8 are welded between the two upper flanges 3 at a certain distance in the longitudinal direction, and the concrete 4 is filled in the U-shaped cavity 12 and has a certain thickness at the upper side of the upper flange 3. The U-shaped cavity is used as a mold for concrete pouring in a construction stage and a stress member in a use stage, so that multiple purposes are achieved. The U-shaped steel bracket 13 is used for placing the concrete secondary beam, the through holes 14 can enable concrete to flow into the U-shaped steel bracket from the combined beam, the integrity of the bracket is improved, the concrete secondary beam placed at the bracket is facilitated to form a continuous beam, and the drawknot piece 8 plays a role in stretching a side die when concrete is poured in a construction stage. The concrete 4 is poured all the way to the upper side of the upper flange 3, and is used for wrapping the upper steel bars and the hogging moment steel bars of the beam pre-buried in the layer.

Referring to fig. 1 to 3, in the embodiment of the U-shaped steel and concrete composite beam provided by the utility model, the upper flange 3 is of a variable cross section, the widths of two ends are larger than those of the midspan, and shear nails 7 are arranged on the upper surface of the upper flange 3 at intervals. The bending moment of the upper flange at the support is larger, the widening is beneficial to improving the bearing capacity, and the shear nails are beneficial to improving the shearing resistance of the superposed surface.

Referring to fig. 2, in an embodiment of a U-shaped steel and concrete composite beam according to the present utility model, the inner side of the double web plate 1 is welded with a through-length horizontal stiffening plate 9. When the beam is high, the addition of the through-length horizontal stiffening plates 9 is beneficial to resisting lateral pressure during concrete pouring.

Referring to fig. 1, in an embodiment of a U-shaped steel and concrete composite girder according to the present utility model, prestressed reinforcement 15 is embedded in the concrete 4, and the concrete 4 is provided with hogging moment reinforcement 6 and stirrups 61 near the upper portion of the support. The prestressed reinforcement 15 is beneficial to improving the bearing capacity of the precast beam, the hogging moment reinforcement 6 is used for bending resistance of the end part, and the stirrup 61 is used for shearing resistance of the end part.

Referring to fig. 1 to 3, in the embodiment of the U-shaped steel and concrete composite beam provided by the utility model, the lower side of the U-shaped steel bracket 13 is welded with a vertical stiffening rib 5, and the drawknot member 8 is a channel steel or angle steel. The vertical stiffening ribs 5 are beneficial to improving the shearing resistance of the bracket.

In the present utility model, all "a certain height, a certain distance" means a length necessary for satisfying design requirements, that is, a length necessary for adapting to connection and strength requirements, which is clear to a person skilled in the art, and is set as required.

Claims

1. A U-shaped steel and concrete composite beam comprises a double web plate, an upper flange, a bottom plate and concrete, and is characterized in that

The double web consists of two vertical steel plates, the lower ends of the two vertical steel plates are welded with the bottom plate to form a U-shaped cavity, the outer side surface of the double web is welded with a plurality of U-shaped steel corbels, the double web at the inner lower part of the U-shaped steel corbels is provided with a through hole,

the upper flanges are respectively welded at the upper ends of the two vertical steel plates, tie pieces welded at a certain distance are longitudinally arranged between the two upper flanges,

the concrete is filled in the U-shaped cavity and the upper part of the upper flange with a certain thickness.

2. The U-shaped steel and concrete composite beam of claim 1 wherein said upper flanges are of variable cross section and have a width at each end greater than the span.

3. The U-shaped steel and concrete composite beam of claim 1 wherein said upper flanges are provided with shear studs spaced apart on the upper surface thereof.

4. The U-shaped steel and concrete composite beam according to claim 1, wherein the inner side of the double web is welded with a through-length horizontal stiffening plate.

5. A U-shaped steel and concrete composite girder as claimed in claim 1, wherein said concrete is embedded with prestressed reinforcement.

6. A U-shaped steel and concrete composite girder as claimed in claim 1, wherein said concrete is provided with hogging moment steel bars and stirrups in the upper part near the support.

7. The U-shaped steel and concrete composite beam according to claim 1, wherein the lower side of the U-shaped steel bracket is welded with vertical stiffening ribs.

8. A U-shaped steel and concrete composite girder as claimed in claim 1, wherein said tie members are channel steel or angle steel.