JP5274735B1 - Steel frame opening reinforcement structure - Google Patents

Abstract

Provided is a web opening reinforcing structure that makes it possible to enlarge an opening through which equipment piping passes without changing the height of the steel web.
A structure comprising a plurality of steel frame parts 2 and a connecting part 4 for connecting adjacent steel frame parts 2 and 2 and reinforcing the vicinity of a central opening 30 for equipment piping formed in a steel frame 1 extending in a horizontal direction, The steel frame portion 2 includes a web 10 arranged along the vertical direction, a pair of flanges 12 and 14 arranged at the upper end portion and the lower end portion of the web 10 and connected to the web 10. The end portions of the pair of flanges 12 and 14 with the square steel pipe 20 and the ends of the adjacent steel frames 2 inserted from both ends of the square steel tube 20 and the central opening 30 formed between the adjacent webs 10 And the pipe 22 that joins the square steel pipe 20, and the facility pipe 100 passes through the side opening 32, the central opening 30, and the side opening 38.

Description

  The present invention relates to an opening reinforcing structure for a steel frame that reinforces an opening formed in a steel frame having I-shaped and H-shaped cross sections.

  Conventionally, many steel-framed buildings with I-shaped and H-shaped cross-sections have been seen. Here, the steel frame is configured to have an I-type or H-type cross-section by a central web and flanges at both ends of the web. By the way, piping for air-conditioning equipment and electrical equipment is arranged in buildings. Here, if the equipment piping is disposed so as to avoid the steel frame, it is necessary to increase the width between the upper floor and the lower floor, that is, the height of the floor. Therefore, in recent years, it has become common to provide an opening for equipment piping in the web for the purpose of reducing the floor height.

  However, providing an opening in the web reduces the strength against shear stress at the opening. Therefore, conventionally, a technique for reinforcing the opening has been proposed.

  Conventionally, as this type of technology, there is a technology described in Patent Document 1. According to Patent Document 1, a through hole for equipment piping is opened in a beam joint portion, and the deterioration of beam performance due to this is caused by a flange splice plate having a predetermined thickness and an angle disposed on the beam web while avoiding the opening. A technique of reinforcing with a splice material made of a splice plate has been proposed.

Japanese Patent No. 3014067

  As a conventional method for reinforcing the opening of the web, as described in Patent Document 1, a reinforcing member is generally joined around the opening of the web. However, in this case, it is necessary to leave a part of the web between the opening and the flange in the web in order to ensure the strength against the shear stress in the opening. That is, the height of the web needs to be set larger than the size of the opening.

  In this case, the floor height increases by the height from the opening to the flange in the web. If the height of the web and the size of the opening can be made the same, the floor height can be reduced. However, conventionally, it is difficult to reinforce the periphery of the opening without leaving a part of the web between the opening and the flange. For this reason, the appearance of an opening reinforcement structure for a steel frame that makes it possible to enlarge an opening through which equipment piping passes without changing the height of the steel frame web is desired.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a steel frame opening reinforcing structure that makes it possible to enlarge an opening through which equipment piping passes without changing the height of a steel frame web.

  In order to achieve the above object, the present invention has the following configuration.

  (1) A steel frame opening reinforcement structure that includes a plurality of steel frame portions and a connecting portion that connects the adjacent steel frame portions, and reinforces the vicinity of an opening for facility piping formed in a steel frame extending in the horizontal direction, The steel frame portion includes a web disposed along a vertical direction, and a pair of flanges disposed at an upper end portion and a lower end portion of the web and coupled to the web. The coupling portion has both end portions. The open ends of the pair of flanges in the state of a square tubular steel pipe and the end of the steel frame inserted from both ends of the steel pipe and the end of the adjacent steel frame separated by a predetermined distance An opening reinforcing structure for a steel frame, comprising: a joining portion that joins the portion and the steel pipe.

  According to (1), in a state where two adjacent steel frame parts are separated by a predetermined distance, these two steel frame parts are inserted into a square tubular steel pipe, and the steel frame part and the steel pipe are joined. Thus, an opening is formed between the two steel frame portions 2. This opening can be used as an opening for equipment piping. Further, the side surface portion of the steel pipe is arranged in parallel to the web. For this reason, the side part of a steel pipe comes to function as a web, the intensity | strength with respect to the shearing stress near opening is improved, and the intensity | strength with respect to the shearing stress near opening is ensured. Also, since the opening for equipment piping is formed by separating the two steel frames, it is possible to make the whole as the opening for equipment piping without leaving a part in the height direction of the web as in the past. become. Accordingly, it is not necessary to increase the height of the web in order to form the opening for equipment piping, and the height of the web can be shortened accordingly. As a result, the floor height of the building can be kept low, and the construction cost can be reduced. Furthermore, in the path of the equipment pipe, it enters from an opening formed between the web and the connecting portion in one steel frame portion, passes through the opening between the two steel frame portions 2, and the web in the other steel frame portion. A path of equipment piping is formed through an opening formed between the connecting portion and the connecting portion. For this reason, it is possible to easily pass the equipment piping through the steel frame.

  (2) In (1), the length of the end of the steel part inserted into the steel pipe is equal to or greater than the length of the steel part in the vertical direction.

  According to (2), it is possible to reliably connect two adjacent steel frame portions by the connecting portion.

  (3) In (1) and (2), the stress transmission plate further includes a stress transmission plate that is interposed between the pair of flanges and the connection portion and transmits stress from the steel frame portion to the connection portion. In the steel frame opening reinforcing structure, the length in the direction along the width direction of the steel frame portion is longer than the length in the direction along the width direction of the steel frame portion in the pair of flanges.

  According to (3), for example, when there is a gap between the pair of flanges and the connecting portion and the width of the flange is shorter than the width of the connecting portion, by interposing a stress transmission plate in the gap, It becomes possible to reinforce the gap portion. At this time, the length in the direction along the width direction of the steel frame portion in the stress transmission plate is longer than the length in the direction along the width direction of the steel frame portion in the pair of flanges. It is possible to enlarge the area where the gallium acts. Thereby, it is possible to prevent stress from being concentrated on a part of the connecting portion from the steel frame portion, and to prevent the connecting portion from being deformed by the stress of the steel frame portion.

  According to the present invention, two adjacent steel frames are separated from each other by a predetermined distance, and the two steel frames are inserted into a square tubular steel pipe, and the steel frame and the steel pipe are joined together. The opening formed between the two steel frames 2 can be used as an opening for equipment piping. Furthermore, since the side surface portion of the steel pipe is arranged in parallel to the web, the side surface portion of the steel pipe functions as a web. For this reason, the strength against the shear stress near the opening is improved, and the strength against the shear stress near the opening is secured. Thereby, it is not necessary to increase the height of the web in order to form the opening, and the height of the web can be shortened. As a result, the floor height of the building can be kept low, and the construction cost can be reduced.

It is a perspective view which shows the principal part of the web opening reinforcement structure of the steel frame 1 in 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is a top view which shows the principal part of the web opening reinforcement structure of the steel frame 1 in 2nd Embodiment of this invention. FIG. 6 is a cross-sectional view taken along the DD line in FIG. 5 and is an explanatory view showing a structure in which equipment piping is passed through the steel frame 1 in one embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is a perspective view showing a main part of a steel frame 1 having a web opening reinforcing structure according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a BB cross-sectional view of FIG. FIG. 4 is a cross-sectional view taken along CC of FIG.

  As shown in FIG. 1, the steel frame 1 has a structure that reinforces an opening for equipment piping, and includes a plurality of steel frame portions 2 and connecting portions 4.

  The steel frame portion 2 is made of a steel member and includes a web 10, an upper flange 12, and a lower flange 14. Here, for convenience of the following description, the X direction shown in FIG. 1 is referred to as a length direction, the Y direction is referred to as a height direction, and the Z direction is referred to as a width direction. Moreover, the length direction, the height direction, and the width direction are perpendicular to each other, and when the steel frame 1 is used as a beam of a building, the height direction is a vertical direction.

  The web 10, the upper flange 12 and the lower flange 14 are formed in a rectangular plate shape extending in the longitudinal direction. The upper flange 12 and the lower flange 14 are arranged to face each other at a predetermined distance.

  The web 10 connects the center portions of the upper flange 12 and the lower flange 14 in the width direction. The upper flange 12 is connected to the upper end of the web 10 and is connected to the lower end of the web 10. Therefore, the upper flange 12 and the lower flange 14 are arranged in the horizontal direction, and the web 10 is arranged in the vertical direction. When the steel frame 1 is viewed from the front along the longitudinal direction, the web 10 and the upper flange 14 are arranged as shown in FIG. It is visually recognized as an H shape by the flange 12 and the lower flange 14. In addition, holes for passing the bolts 22 are formed at the ends of the upper flange 12 and the lower flange 14.

  The connection part 4 is provided with a square tubular pipe 20 having a square cylindrical shape and a bolt 22 corresponding to a joint part. The square steel pipe 20 is open at both ends, and the opening at both ends is set to a size that allows the steel frame 2 to be inserted. Here, when the steel frame portion 2 is inserted into the square steel pipe 20, the flat portion facing the upper flange 12 is the upper surface portion, the flat portion facing the lower flange 12 is the lower surface portion, and the web 10 is placed at a predetermined distance. The opposing flat portions are referred to as side portions.

  In the present embodiment, the length in the width direction of the upper surface portion and the lower surface portion inside the square steel pipe 20 is slightly larger than the length in the width direction of the upper flange 12 and the lower flange 14, and the side surface inside the square steel pipe 20. The length in the height direction of the portion is set to be slightly larger than the height from the upper surface of the upper flange 12 to the lower surface of the lower flange 14. For this reason, when the steel frame portion 2 is inserted into the connecting portion 4, the upper surface of the upper flange 12 is close to the surface of the upper surface portion inside the square steel pipe 20, as shown in FIG. 2. Similarly, the lower surface of the lower flange 14 is close to the surface of the lower surface portion inside the square steel pipe 20.

  Moreover, the hole part for letting the volt | bolt 22 pass is formed in the both ends of the longitudinal direction of the upper surface part in the square steel pipe 20, and a lower surface part. And when connecting the two steel frame parts 2 and the square steel pipe 20, the edge part of the adjacent steel frame parts 2 and 2 is first inserted in the both ends of the square steel pipe 20. FIG. Here, the length of the end portion of the steel frame portion 2 inserted into the square steel pipe 20 is set to be equal to or slightly longer than the length of the steel frame portion 2 in the height direction.

  When the end portions of the steel frames 2 and 2 are inserted into both end portions of the square steel pipe 20, as shown in FIG. 3, the holes of the upper flange 12 and the lower flange 14 and the upper and lower surfaces of the square steel pipe 20. The hole part matches. At this point, both end portions of the adjacent steel frame portions 2 and 2 are in a state of being separated by a predetermined length in the longitudinal direction. Then, the upper flange 12 and the lower flange 14 and the square steel pipe 20 are joined by bolts 22.

  By connecting the two steel frames 2 and the square steel pipe 20 in this way, a central opening 30 corresponding to an opening for equipment piping is formed between the adjacent steel frames 2 and 2. The length in the longitudinal direction of the central opening 30 is set to a length that allows the facility wiring to pass therethrough. Further, side openings 32 and 34 are formed between the web 10 of one steel frame portion 2 in the adjacent steel frame portions 2 and 2 and both side surface portions of the square steel pipe 20. Similarly, side openings 36 and 38 are formed between the web 10 of the other steel frame portion 2 and both side surface portions of the square steel pipe 20. At this time, as shown in FIG. 4, the side openings 32 and the side openings 38 are located in the diagonal direction. Similarly, the side opening 34 and the side opening 36 are located in the diagonal direction.

  The equipment piping refers to piping for air conditioning equipment, piping for passing various cables for electrical equipment, and the cable itself. As an example, as shown in FIG. 4, the facility piping 100 is passed through the steel frame 1 by a route that enters the side opening 32, passes through the central opening 30, and exits from the side opening 34 or the side opening 38. The

  As described above, according to the present embodiment configured as described above, in a state where the two steel frame parts 2 are separated from each other by a predetermined length in the longitudinal direction, the two steel frame parts 2 are square-shaped square-shaped. By joining with a steel pipe, the central opening 30 formed between the two steel frames 2 can be used as an opening for equipment piping. Furthermore, the upper surface part and lower surface part of the square steel pipe 20 function as a flange, and the side surface part of the square steel pipe 20 functions as a web. For this reason, the intensity | strength with respect to the shear stress of the center opening 30 vicinity improves, and the intensity | strength with respect to a shear stress is ensured even if the two steel frame parts 2 are spaced apart.

  In addition, since the central opening 30 for equipment piping is formed by separating the two steel frames 2, the entire opening can be made without leaving a part in the height direction of the web as in the prior art. Become. Thereby, it is not necessary to increase the height of the web in order to form the opening, and the height of the web can be shortened. As a result, the floor height of the building can be kept low, and the construction cost can be reduced.

  Moreover, since the length of the edge part of the steel frame part 2 inserted in the square steel pipe 20 is more than the length (length of the height direction) of the vertical direction of the steel frame part 2, two adjacent steel frame parts 2 can be reliably connected by the connecting portion 4.

  By the way, in 1st Embodiment shown in FIG. 1, the steel frame part 2 consists of H steel, and the length of the width direction of the square-shaped steel pipe 20 is a little larger than the length of the width direction of the upper flange 12 and the lower flange 14 in it. The degree is set. For this reason, the stress from the steel frame portion 2 is applied to the square steel pipe 20 over a wide range via the upper flange 12 and the lower flange 14. However, when the steel frame portion 2 is I steel, the length in the width direction of the upper flange 12 and the lower flange 14 is shorter than the length in the width direction of the square steel pipe 20. For this reason, the contact area between the upper flange 12 and the lower flange 14 and the square steel pipe 20 is reduced, and the stress from the steel frame portion 2 is concentrated on a part of the upper surface portion and the lower surface portion of the square steel pipe 20. become. In view of this, the second embodiment is configured to widen the area where the stress from the steel frame portion 2 in the square steel pipe 20 is applied.

[Second Embodiment]
FIG. 5 is a plan view showing the main part of the web opening reinforcing structure of the steel frame 1 in the second embodiment of the present invention, and FIG. 6 is a DD sectional view of FIG. In the second embodiment shown in FIG. 5 and FIG. 6, the same members or members having the same functions as those in the first embodiment shown in FIG. did.

  In the steel frame 1 in the second embodiment, the height of the square steel pipe 20 in the steel frame 1 in the first embodiment is increased so that the square steel pipe 20 and the upper flange 12 and the square steel pipe 20 and the lower flange 14 are interposed. As shown in FIG. 6, a gap 50 is formed, and the stress transmission plate 40 is interposed in the gap 50.

  As shown in FIG. 5, the stress transmission plate 40 is a steel plate member having a substantially home base shape formed by combining a rectangle and an isosceles trapezoid. In the isosceles trapezoidal portion of the stress transmission plate 40, the length of the short side of the two parallel sides is equal to the length in the width direction of the upper flange 12 and the lower flange 14, and the length of the long side is a corner. It is set slightly shorter than the length in the width direction of the inner surface of the shaped steel pipe 20.

  The stress transmission plate 40 configured in this manner is fixed to the ends of the upper flange 12 and the lower flange 14 by bolts 42 and 42. At this time, the long side of the stress transmission plate 40 is overlapped with the tips of the upper flange 12 and the lower flange 14, and the isosceles trapezoid side portion is fixed to the upper flange 12 and the lower flange 14 by bolts 42 and 42.

  Further, the end portion of the steel frame portion 2 is inserted into the square steel pipe 20, and the square steel pipe 20, the stress transmission plate 40 and the upper flange 12 are fastened by bolts 44 and 44 in a state of being overlapped. Similarly, the square steel pipe 20, the stress transmission plate 40, and the lower flange 14 are fastened by bolts 44, 44 in an overlapped state.

  In the second embodiment configured as described above, there is a gap 50 between the upper flange 12 and the lower flange 14 and the square steel pipe 20, and the lengths in the width direction of the upper flange 12 and the lower flange 14 are connected. When the length of the portion is shorter than the length in the width direction, the portion of the gap 50 can be reinforced by interposing the stress transmission plate 40 in the gap 50. At this time, since the length in the width direction of the stress transmission plate 40 is longer than the length in the width direction of the upper flange 12 and the lower flange 14, a region where the stress from the steel frame portion 2 acts on the square steel pipe 20 is increased. can do. For this reason, it is possible to prevent stress from being concentrated on the part of the connecting part 4 from the steel part 2 and to prevent the connecting part from being deformed by the stress of the steel part.

  In addition, in 2nd Embodiment mentioned above, although the bolts 42 and 44 are used for fixation with the stress transmission plate 40, the square steel pipe 20, and the upper flange 12 or the lower flange 14, it is not restricted to it. For example, by welding the stress transmission plate 40, the square steel pipe 20, and the upper flange 12 or the lower flange 14, it is possible to reduce the length in the height direction of the steel frame 1 by the amount that the bolts 42 and 44 protrude. become.

DESCRIPTION OF SYMBOLS 1 Steel frame 2 Steel frame part 4 Connection part 10 Web 12 Upper flange 14 Lower flange 20 Square type steel pipe 22 Bolt 30 Center opening 32 Side opening 34 Side opening 36 Side opening 38 Side opening 40 Stress transmission plate 42 Bolt 44 Bolt 50 Clearance 100 Equipment piping

Claims (3)

An opening reinforcement structure for a steel frame that includes a plurality of steel frame portions and a connecting portion that connects the adjacent steel frame portions, and reinforces the vicinity of an opening for equipment piping formed in a steel frame extending in the horizontal direction,
The steel part is
A web arranged along the vertical direction, and a pair of flanges arranged at the upper end and lower end of the web and connected to the web;
The connecting part is a state in which both ends of the steel pipe are inserted into a rectangular tubular steel pipe having both ends open, and the end of the steel part is adjacent to a predetermined distance from both ends of the steel pipe. An opening reinforcing structure for a steel frame, comprising: a joining portion for joining the end portions of the pair of flanges and the steel pipe.   2. The opening reinforcing structure for a steel frame according to claim 1, wherein the length of the end of the steel part inserted into the steel pipe is equal to or longer than the length of the steel part in the vertical direction. A stress transmission plate that is interposed between the pair of flanges and the connecting portion and transmits stress from the steel frame portion to the connecting portion;
The length of the stress transmission plate in the direction along the width direction of the steel frame portion is longer than the length of the pair of flanges in the direction along the width direction of the steel frame portion. Steel opening reinforcement structure as described.

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