KR-20260064773-A - A Composite column system with double steel pipe structure for fire resistant constructionwith improved structural performance and constructability

Abstract

The present invention relates to a column for supporting a load when constructing a building, and more specifically, it is manufactured as a double-pipe structure in which a circular inner steel pipe is provided in the center and an outer angle is joined to the outside by welding, thereby improving strength under compression or tension and improving workability to facilitate construction, thus having the advantage of improved structural performance and constructability. In addition, in the event of a fire, the internal circular pipe supports the target fire resistance performance, making it possible to omit or reduce a separate fire-resistant coating, while maintaining stable structural strength during normal operation.

Inventors

• 정광량
• 유성훈
• 김정현
• 박정우
• 김지영
• 송호범
• 강경승
• 김수나

Assignees

• (주)씨앤피동양
• 정광량

Dates

Publication Date

20260508

Application Date

20241029

Claims (5)

1. A circular inner steel pipe (100) formed in the shape of a circular tube and installed in the central part of a column; and A composite column system of a double steel pipe structure for fire-resistant structures with improved structural performance and constructability, characterized by including: an outer angle (200) installed on the outside of the circular inner steel pipe (100) to form a double pipe structure, configured to form a divided structure in the shape of an angle and installed by individual welding.
2. In claim 1, A composite column system of a double steel pipe structure for fire-resistant structures with improved structural performance and constructability, characterized by having a spacing member (300) that can form a double pipe structure at regular intervals between the inner circular steel pipe (100) and the outer angle (200).
3. In claim 1, The above circular inner steel pipe (100) and outer angle (200) are constructed in sections, and a connecting steel plate (400) connecting the sections is further provided between each section. A composite column system of a double steel pipe structure for fire-resistant structures with improved structural performance and constructability, characterized in that the connecting steel plate (400) has a penetrating concrete inlet hole (430) formed therein to allow concrete to flow into the space between the circular inner steel pipe (100) and the outer angle (200).
4. In claim 2, The above spacing maintaining member (300) is A composite column system of a double steel pipe structure for fire-resistant structures with improved structural performance and constructability, characterized by being composed of either a vertical spacing member (310) installed in the vertical direction where the column is constructed or a horizontal spacing member (320) installed in the horizontal direction.
5. In claim 4, The location where the above-mentioned spacing member (300) is installed includes a spacing member installation part (110) that can install the spacing member (300) in an accurate position, and A composite column system of a double steel pipe structure for a fire-resistant structure with improved structural performance and constructability, characterized in that a connection position checking groove (111) is formed on the inner side of the above-mentioned spacing member installation part (110) to fix the connection position where the spacing member (300) is connected at a constant level, and the spacing member (300) includes a connection position checking groove (111) that is engaged with the connection position checking groove (111) at a position corresponding to the connection position checking groove (111) to check and fix the connection position to form a constant level.

Description

A Composite column system with double steel pipe structure for fire-resistant construction with improved structural performance and constructability The present invention relates to a column for supporting a load when constructing a building, and more specifically, to a composite column system of a double-steel pipe structure for fire-resistant structures with improved structural performance and constructability, wherein the double-steel pipe structure is manufactured by forming a circular inner steel pipe in the center and joining an outer angle to the outside by welding, thereby improving the strength of the concrete due to the confinement effect of the internal concrete according to standards and improving workability to facilitate construction. Generally, when constructing a building, columns are installed to support the inter-story load, and the structure is constructed to support the load through the columns. These columns are constructed by pouring concrete after installing reinforcing bars and formwork, but this leads to increased labor costs for the workforce involved in installing reinforcing bars and formwork, and causes problems such as delays in the construction period. Furthermore, since the steel plate itself lacks fire resistance, additional fire-resistant coating work must be performed, which leads to problems such as increased construction time and additional costs resulting from the addition of processes. Accordingly, workability is being improved by applying columns with a composite structure using steel pipes. For composite structures, methods such as the filling method, in which steel pipes are installed and concrete is filled inside, and the covering method, in which structural steel is covered with concrete, are used. This composite structure is also suitable for supporting axial loads resulting from the increasing height of building structures, and the filled steel tube method allows for improved fire resistance performance because the filled concrete, which has a high thermal capacity, supports the axial force. In this regard, Korean Registered Patent Publication No. 10-0951646 (Method for manufacturing a concrete-filled steel column with a double steel pipe structure) discloses a method for constructing a steel column by preparing an inner steel pipe, welding a ring plate having multiple holes formed along the circumferential direction at the top of an outer steel pipe with a diameter larger than that of the inner steel pipe such that its inner surface contacts the inner steel pipe and its outer surface protrudes to the outside of the outer steel pipe, and then filling it with concrete. However, the prior art presents a problem of difficult construction because it involves inserting inner and outer steel pipes along the length, and also has the problem of lacking the effectiveness of a double steel pipe since it replaces the concrete pouring trimming pipe. Therefore, there is a need for a composite column system with a double steel pipe structure for fire-resistant construction that significantly improves the strength of the concrete surrounded by steel pipes by considering the restraint effect on the circular composite column, thereby enabling support for larger axial forces or reduction of steel quantity; furthermore, since it is composed of a double steel pipe structure, it enhances structural performance and fire resistance without increasing the thickness of the steel plates. FIG. 1 is an exploded perspective view of a composite column system of a double steel pipe structure for fire-resistant structures with improved structural performance and constructability according to an embodiment of the present invention. FIG. 2 is a perspective view illustrating a combined state of a composite column system of a double steel pipe structure for fire-resistant structures with improved structural performance and constructability according to an embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating an example of a composite column system of a double steel pipe structure for fire-resistant structures with improved structural performance and constructability according to an embodiment of the present invention. FIG. 4 is a stacked installation state diagram illustrating a state in which a connecting steel plate for stacking connection is provided in a composite column system of a double steel pipe structure for fire-resistant structures with improved structural performance and constructability according to an embodiment of the present invention. FIG. 5 is a drawing illustrating an example of a connecting steel plate for a composite column system of a double steel pipe structure for fire-resistant structures with improved structural performance and constructability according to an embodiment of the present invention. FIG. 6 is a cross-sectional view illustrating a concrete-filled construction state in a composite column system of a double steel pipe structure for