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KR-102961884-B1 - Composite beam of steel and concrete with concrete cover

KR102961884B1KR 102961884 B1KR102961884 B1KR 102961884B1KR-102961884-B1

Abstract

The present invention relates to a steel-concrete composite beam equipped with a concrete cover, wherein the concrete cover is formed to surround the exterior of a U-shaped main steel plate beam equipped with internal concrete, thereby utilizing the advantages of a TSC composite beam, such as excellent structural performance and constructability and the ability to shorten construction time, while ensuring fire resistance performance. The steel-concrete composite beam equipped with a concrete cover according to the present invention is characterized by comprising: a main steel plate beam composed of a pair of web plates spaced apart in the width direction and a lower plate closing the lower portion of the pair of web plates; internal concrete filled inside the main steel plate beam; a vertical connecting bar provided in a vertical direction on the outer surface of the web plate and a horizontal connecting bar provided in a width direction on the lower surface of the lower plate; a skin foam coupled to the outside of the connecting bar and covering the outside of the main steel plate beam so as to be spaced apart from the main steel plate beam; and a concrete cover provided to be poured into the space between the main steel plate beam and the skin foam and to cover the outside of the main steel plate beam.

Inventors

  • 이창남

Assignees

  • (주)센벡스

Dates

Publication Date
20260507
Application Date
20250407

Claims (7)

  1. A main steel plate beam (2) composed of a pair of web plates (21) spaced apart in the width direction and a lower plate (22) that closes the lower part of the pair of web plates (21); Internal concrete (3) filled inside the main steel plate beam (2); A vertical connecting bar (6a) provided in a vertical direction on the outer surface of the web plate (21) and a horizontal connecting bar (6b) provided in a width direction on the lower surface of the lower plate (22); A skin foam (5) that is coupled to the outside of the connecting bars (6a, 6b) and wraps around the outside of the main steel plate beam (2) so as to be spaced apart from the main steel plate beam (2); and A steel-concrete composite beam equipped with a concrete cover, characterized by being composed of: a concrete cover (4) poured into the space between the main steel plate beam (2) and the skin form (5) to surround the outside of the main steel plate beam (2).
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  4. In paragraph 1, A steel-concrete composite beam equipped with a concrete cover, characterized in that a main steel plate beam (2) has a cross-sectional upper and lower corner section having a main steel member (23) provided in the longitudinal direction.
  5. In Paragraph 4, A steel-concrete composite beam having a concrete cover, characterized in that an auxiliary member (24) is provided in the longitudinal direction between the main member (23) on the inner surface of the web plate (21) and the upper surface of the lower plate (22).
  6. In paragraph 5, A steel-concrete composite beam with a concrete cover, characterized in that the interior of the main steel plate beam (2) has a reinforcing member (25) connecting an auxiliary steel member (24) provided on the web plate (21) and an auxiliary steel member (24) provided on the lower plate (22).
  7. In paragraph 6, A steel-concrete composite beam equipped with a concrete cover, characterized in that a lightweight block (7) embedded in the interior of the main steel plate beam (2) is provided within the interior of the internal concrete (3).

Description

Composite beam of steel and concrete with concrete cover The present invention relates to a steel-concrete composite beam equipped with a concrete cover, wherein the concrete cover is formed to surround the exterior of a U-shaped main steel plate beam equipped with internal concrete, thereby utilizing the advantages of a TSC composite beam, such as excellent structural performance and constructability and the ability to shorten construction time, while ensuring fire resistance performance. Reinforced concrete members are constructed in the sequence of installing formwork, arranging reinforcing bars inside the formwork, pouring concrete, and curing. Conventional reinforced concrete construction methods require a long construction period and make it difficult to ensure uniform quality because formwork installation and rebar placement are carried out on-site. In addition, separate temporary materials must be installed to support the formwork and resist the pressure of concrete pouring, which adds installation and dismantling processes. Furthermore, interference from these temporary materials makes it difficult to secure on-site workspace and passageways, and raises concerns about safety accidents. In particular, large members are used in structures requiring high ceilings and long spans, such as semiconductor and display factories and logistics centers. However, the use of large members inevitably requires working at heights during construction, which reduces workability and safety, and increases construction costs due to the larger scale required for temporary materials such as system supports. In addition, conventional formwork construction involves applying a release agent to the surface of the formwork panels to facilitate formwork removal. However, the release agent poses a problem of causing environmental pollution, and it is cumbersome as it requires separate concrete surface treatment work after formwork removal. Therefore, designing large-scale, long-span buildings with steel frames or SRC structures rather than reinforced concrete structures is advantageous in terms of construction time, constructability, and economic efficiency. However, steel frame structures have disadvantages such as resistance to vibration and high construction costs. Furthermore, conventional SRC structures, in which steel members are embedded within concrete, require the installation of temporary materials such as formwork, which limits improvements in constructability or reduction of construction time. To improve upon the disadvantages of conventional SRC structures, a TSC composite beam was developed in which U-shaped steel plate beams, which are steel members, are placed externally and concrete is poured inside the steel plate beams. Since TSC composite beams have steel members placed externally, improving cross-sectional efficiency, they can not only relatively reduce the amount of steel but also shorten the construction period by eliminating the temporary construction process for formwork installation. However, since the steel members of these TSC composite beams are exposed to the outside, separate fire-resistant treatment is required. A fire-resistant structure is a structure that possesses fire-resistant performance to withstand a fire for a certain period of time, so as not to cause damage to the structure due to the heat of the fire when it occurs. To this end, building-related laws specify fire resistance performance for fire-resistant structures of building structures as 0.5 hours, 1 hour, 1.5 hours, 2 hours, and 3 hours. In particular, steel generally melts or undergoes significant deformation when directly exposed to temperatures above 1200°C, making it unusable as a structural material. Therefore, to make columns, beams, etc., fire-resistant structures, it is required to apply a fire-resistant coating by wrapping the surface of the member with a material having the necessary fire-resistant performance. Conventionally, a fire-resistant coating was formed by directly spraying refractory materials such as fiber spray or asbestos onto the outer surface of steel members. However, when forming a refractory coating by spraying, the adhesion of the refractory material decreases when the temperature is low, such as during winter, and the refractory material often falls off. Furthermore, lightweight porous materials are frequently used in refractory materials; however, these materials are not rigid, making them prone to detachment and vulnerable to moisture, which makes them unsuitable for use as finishing materials. In particular, if they absorb water during the firefighting process, the entire refractory material can detach at once. In addition, the working environment is poor due to the scattering of fire-resistant material during the spraying of fire-resistant coatings, and there are concerns about worker safety issues due to the high-altitude work, as the spraying is carried out after the installation of steel member