JP2008267022A - Brace installation structure for roof steel frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brace installation structure for a roof steel frame with a reduced number of components wherein it is easy to manage materials and construction while costs can be reduced and a construction period can be shortened. <P>SOLUTION: The roof frame is composed of a beam steel frame of an approximately H-shaped cross section and a beam steel frame 2 of an approximately H-shaped cross section crossing over the beam steel frame 1 at an right angle with a bolt/nut 4. In reinforcing the roof frame with a brace 7 mounted diagonally across the beam steel frames, the brace 7 is composed of a brace material 9 with a turn buckle 8 and a gusset plate 11 with hooks 10 continuously arranged at its both sides. The gusset plate with hooks are hooked on lower flanges of the steel frames at both sides and fastened/fixed with the turn buckle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a brace in which a roof steel frame composed of a beam steel frame with a substantially H-shaped cross section and a beam steel frame with a substantially H-shaped cross-section erected at right angles to the beam steel is bridged diagonally between the beam steel frames on both sides. The present invention relates to a brace installation structure of a reinforced roof steel frame.

  Currently, there are many seismic diagnosis and seismic reinforcement for buildings designed by the old seismic design method. Among them, the school gymnasium is sometimes used as an evacuation site for local residents, and its reinforcement is an important issue.

  In general, the roof surface of a gymnasium designed by the old seismic design method often lacks horizontal braces when examined according to current standards. There are also some buildings that have no horizontal braces on the roof.

In such a case, it is necessary to reinforce the existing roof steel frame with a horizontal brace that extends between the beam steel frames on both sides in a diagonal direction. However, conventionally, when adding horizontal braces to an existing roof steel frame, the required number of gusset plates are manufactured at the factory, and these gusset plates are attached to predetermined positions of the roof steel frame by welding, and then between the gusset plates. Since the construction method of attaching the brace material by welding was adopted, there were the following problems.
(1) Since the scaffolding is installed and welding work is performed at a high place, a large-scale curing is required, the cost is high, and the construction period is long.
(2) Since the welding posture is close to upward, the welding operation is troublesome and it is difficult to ensure the welding quality.

  In addition, as a reinforcing device for a small-scale steel structure assembled with columns and beams, as seen in Patent Document 1, a fixing plate having a plane wider than the surface of the column or beam steel frame, A connecting plate with a brace connecting hole formed directly in the center and an anchor bolt that protrudes at right angles from both sides of the fixing plate at an interval corresponding to the width of the steel frame and has a claw at the tip, and fix it Nuts to be mounted on the plate for fixing, fixing bolts to be screwed into bolt holes formed in the center in the width direction of the fixing plate, brace material formed by welding a gusset plate to a round bar with turnbuckle, and brace material There is known a reinforcing device composed of a bolt and a nut for connecting the gusset plate and the connecting plate.

  However, this reinforcing device welds a gusset plate to a fixing plate, a connecting plate, a fixing bolt, an anchor bolt and a nut for fixing the fixing plate to a steel frame for a column or a beam, and a round bar with a turnbuckle. Brace material, and many parts such as bolts and nuts that connect the brace material gusset plate and the connecting plate are required, which not only increases the cost, but also increases the number of parts, and material management and construction management It is very troublesome and is not suitable as a seismic reinforcement measure for existing roof steel frames.

Japanese Patent Publication No. 5-75860

The present invention has been made in view of the above problems, and its purpose is to reduce the number of components for installing braces, facilitate material management and construction management, and reduce costs. An object of the present invention is to provide a roof steel brace installation structure capable of shortening the construction period.

  In order to achieve the above object, in the present invention, a roof steel frame composed of a beam steel frame having a substantially H-shaped cross section and a beam steel frame having a substantially H-shaped cross section erected at right angles to the beam steel frame is provided between the beam steel frames on both sides. To reinforce with diagonal braces, the brace is composed of brace material with turnbuckles and gusset plates with hooks connected to both ends of the brace. And is fastened and fixed with the turnbuckle.

  Specifically, as in the invention described in claim 2, a gusset plate with a hook is constituted by a flat plate portion and a hook having a shape bent at a right angle in a plan view and connected to the tip thereof, and the gusset with the hook. The plate is hooked on the outer corner portion of the lower flange in the beam steel for the small beam on both sides, and is fastened and fixed with the turnbuckle.

  In the invention according to claim 3, the gusset plate with a hook is composed of a flat plate portion and a hook having a linear shape in plan view connected to the tip thereof, and the gusset plate with a hook is used as a beam for large beams on both sides. It is hooked on the outer edge of the lower flange of the steel frame and fastened and fixed with the turnbuckle.

  In the invention according to claim 4, the gusset plate with the hook constituted by the flat plate portion and the hook bent in a right angle in a plan view is connected to the tip of the lower flange of the beam steel frame for the small beam on both sides. While hooked to the outer corner and fastened with the turnbuckle, the gusset plates with hooks composed of the flat plate and hooks that are linear in plan view connected to the tip of the plate are used for the large beams on both sides. It is hooked on the outer edge of the lower flange of the steel frame and fastened and fixed with the turnbuckle.

  In the present invention, a beam steel frame having a substantially H-shaped cross section includes a beam steel frame made of H-shaped steel and a beam steel frame made of I-shaped steel, and angle members or angle steels are arranged back to back to form a flange portion. This also includes a truss beam in which a lattice material such as a flat bar is provided between the flange portions.

  According to the invention described in claims 1 to 4, the roof steel frame can be reinforced by simply hooking the gusset plates with hooks at both ends of the brace to the lower flanges of the beam steel frames on both sides and tightening with turnbuckles. This eliminates the welding work in an upward position in the machine, so that construction can be completed in a very short time and safely, significantly shortening the work period and reducing costs, and hooks on both ends of the brace material with turnbuckles. Since braces with continuous gusset plates are used, the number of components for installing braces is small, and material management and construction management are easy.

  According to the invention described in claim 2, it is suitable for reinforcing the roof steel frame when the beam formation of the large beam and the small beam is the same. That is, even if the beam formation of the large beam and the small beam is the same, there is usually a gap of about 10 mm between the steel beam for the large beam and the steel frame for the small beam that is erected at right angles via bolts and nuts. Therefore, a gusset plate hook is inserted from below into the gap of about 10 mm formed between the lower flange of the large beam steel frame and the lower flange of the small beam steel frame. It can be hooked to the outer corner and braces can be installed.

According to the third and fourth aspects of the present invention, the hooked gusset plate is hooked to the outer edge of the lower flange of the beam steel beams for the large beams on both sides, which is suitable when the beam formation of the large beam and the small beam is different. In particular, there is an advantage that when the ceiling equipment such as air-conditioning pipes and lighting fixtures existing directly under the roof surface becomes an obstacle to the brace, the brace can be installed avoiding the ceiling equipment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1, FIG. 2, FIG. 7 and FIG. 8 show an example of a roof steel brace installation structure according to the present invention. 1 is a beam steel frame for large beams made of H-shaped steel, 2 is a beam steel frame for small beams made of H-shaped steel, and is erected at right angles to the beam steel frame 1 for large beams via bolts and nuts 4. The beam structure of the small beams constitutes the same roof steel frame.

  Reference numeral 5 denotes a gusset plate for joining a small beam, which is welded to the upper and lower flanges 1a, 1b and the web 1c of the beam steel frame 1 for a large beam. 2a is the upper flange of the beam steel frame 2 for the small beam, 2b is the lower flange, 2c is the web, and between the upper and lower flanges 2a and 2b and the upper and lower flanges 1a and 1b of the beam steel frame 1 for the large beam A gap S of about 10 mm is formed in. 6 is a roofing material. In the embodiment shown in FIGS. 6 to 8, the gusset plate 5 and the web 2c of the beam steel frame 2 for the small beam are overlapped and joined by bolts and nuts 4, but will be described later with reference to FIGS. 12, the gusset plate 5 and the web 2 c of the beam steel frame 2 for the small beam are opposed to each other with a gap S of about 10 mm therebetween, and joined by the splice plate 3 and the bolt / nut 4 sandwiching them. May be.

  Reference numeral 7 denotes a brace for reinforcement that extends across the roof steel frame in a diagonal direction. As shown in FIGS. 3 to 5, a brace material 9 with a turnbuckle 8 and gussets with hooks 10 connected to both ends thereof. It consists of a plate 11. Steel bars are used as the brace material 9. The gusset plate 11 with the hook 10 is connected to the flat plate portion 12 and the tip thereof, and in a plan view so that the gusset plate 11 can be hooked to the corner portion outside the lower flange 2b of the beam steel frame 2 for a small beam (see FIG. 4, the hook 10 has a shape bent at a right angle (as viewed from a direction perpendicular to the plate surface of the flat plate portion 12).

  Then, the hook 10 of the gusset plate 11 with the hook 10 is inserted into the gap S between the lower flange 1b of the beam steel frame 1 for the large beam and the lower flange 2b of the beam steel frame 2 for the small beam from the lower side, The braces 7 are installed in a diagonal direction by being hooked on the outer corners of the lower flange 2 b of the beam steel frame 2 and fastened and fixed by the turnbuckle 8.

  In the embodiment shown in FIG. 1, not only the turnbuckles 8 are provided at positions where they do not overlap each other in order to cross the braces 7 extending in the diagonal direction in an X shape, but also as shown in FIG. A brace 7 in which the material 9 is welded to the front surface side of the flat plate portion 12 and a brace 7 in which the brace material 9 is welded to the back surface side of the flat plate portion 12 are used.

Further, in the illustrated embodiment, the braces 7 are installed between the beam steel frames 2 for three or more small beams, so that both corners of the lower flange 2b of the beam steel frame 2 for one small beam are provided. Since the flat plate portions 12 of the two hooked gusset plates 11 with hooks 10 overlap each other, the rising length from the flat plate portion 12 corresponds to the thickness of the lower flange 2b as shown in FIG. It uses a short hook 10, which is set to a length H _1, and a long hook 10 which is set to a length H ₂ was the thickness of a long plate portion 12 than that. However, the flat plate portion 12
Even when they overlap each other, it is possible to carry out with only the long hook 10. Moreover, when installing the brace 7 between the two beam steel frames 2 for small beams, since the flat plate parts 12 do not overlap, it can carry out using only the short hook 10. FIG.

According to the above configuration, the roof steel frame can be reinforced by simply hooking the gusset plates 11 with hooks 10 at both ends of the brace 7 to the lower flange 2b of the beam steel frame 2 on both sides and tightening with the turnbuckle 8. Since the welding work in the upward position is omitted, the construction can be completed in a very short time and safely, the construction period can be greatly reduced and the cost can be reduced, and the brace material 9 with the turnbuckle 8 is attached to both ends. Since the brace 7 in which the gusset plate 11 with the hook 10 is continuously provided is used, the number of components for installing the brace is small, and material management and construction management are easy.

  9 to 12 show another embodiment of the present invention. In this embodiment, the gusset plate 11 with the hook 10 in the brace 7 composed of the brace material 9 with the turnbuckle 8 and the gusset plate 11 with the hook 10 connected to both ends of the brace 7 is attached to the flat plate portion 12 and the tip thereof. A hook 10 having a linear shape in a plan view that is continuously provided, and the gusset plate 11 with the hook 10 is hooked on the outer edge of the lower flange 1b of the beam steel frames 1 for the large beams on both sides, and the turnbuckle 8 It is characterized in that it is fastened and fixed with. The gusset plate 5 for joining the small beam welded to the beam steel frame 1 for the large beam and the web 2c of the beam steel frame 2 for the small beam are arranged opposite to each other with a gap S of about 10 mm therebetween, They are joined by a splice plate 3 and bolts / nuts 4 sandwiching them.

  According to said structure, since the gusset plate 11 with the hook 10 is hooked on the outer edge part of the lower flange 1b in the beam steel frame 1 for the large beams on both sides, it is suitable when the beam formation of the large beam and the small beam is different. In particular, when ceiling equipment such as air-conditioning pipes and lighting fixtures existing directly under the roof surface becomes an obstacle to the brace 7, there is an advantage that the brace 7 can be installed avoiding the ceiling equipment. Since other configurations and operations are the same as those of the embodiment of FIGS. 1 to 8, the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 13 shows another embodiment of the present invention, which is characterized in that the hook position of the gusset plate 11 with the hook 10 with respect to the lower flange 1b in the beam steel frame 1 for the large beam is as close as possible to the intersection of the large beam and the small beam. . Since other configurations and operations are the same as those of the embodiment of FIGS. 9 to 12, the same components are denoted by the same reference numerals, and description thereof is omitted.

14 and 15 show another embodiment of the present invention. This embodiment uses a brace 7 installed between the beam steel frames 2 for small beams described in FIG. 3 and a brace 7 installed between the beam steel frames 1 for large beams described in FIGS. 9 and 10. The brace 7 stretched between the lower flanges 1b of the beam steel frame 1 and the brace 7 stretched between the lower flanges 2b of the beam beam 2 for the small beam are crossed in an X shape to reinforce the roof steel frame There is a feature. That is, the outer side of the lower flange 2b of the beam steel frame 2 for the small beam on both sides is formed by connecting the gusset plate 11 with the hook 10 constituted by the flat plate portion 12 and the hook 10 bent at a right angle in plan view. The gusset plate 11 with the hook 10 composed of the flat plate portion 12 and the hook 10 having a linear shape in plan view connected to the tip of the flat plate portion 12 is fixed to the large beam on both sides. The steel beam 1 is hooked on the outer edge of the lower flange 1 b and fixed with a turnbuckle 8. Other configurations and operations are the same as those in the embodiment of FIGS.

  In addition, although each embodiment mentioned above has installed the brace 7 as an earthquake-proof reinforcement of the existing roof steel frame, of course, this invention is applicable also when building a roof steel frame newly. In each of the above-described embodiments, the beam steel frame 1 for the large beam and the beam steel frame 2 for the small beam are H-shaped steel. However, as the roof steel frame to which the present invention is applied, the beam steel frame for the large beam is used. 1 and the steel beam 2 for the small beam may be I-shaped steel. Furthermore, the steel beam 1 for the large beam is an I-shaped steel, and the steel beam 2 for the small beam is an H-shaped steel roof. The present invention can be similarly applied to a steel frame. Further, at least one of the beam steel frame 1 for the large beam and the beam steel frame 2 for the small beam, as shown in FIG. 16, a pair of angle members (or angle steels) 13 are arranged back to back to form a flange member. The present invention can be similarly applied to a roof steel frame that is a truss beam provided with a lattice material 14 made of a flat bar or the like between upper and lower flange members.

It is the figure which looked up at the brace installation structure of the roof steel frame which concerns on this invention from the downward direction. It is a perspective view of the principal part. It is a perspective view of a brace. It is a top view of a gusset plate with a hook. It is a vertical side view of the principal part of a gusset plate with a hook. It is a vertical side view of the principal part which shows the state just before installing a brace. It is a vertical side view of the principal part which shows the state which installed the brace. FIG. 8 is a longitudinal side view of a main part showing a state when FIG. 7 is viewed from the longitudinal direction of the beam. It is the figure which looked up at the brace installation structure of the roof steel frame which shows other embodiment of this invention from the downward direction. It is explanatory drawing of the brace used for FIG. It is a vertical side view of the principal part which shows the state just before installing a brace. It is a vertical side view of the principal part which shows the state which installed the brace. It is the figure which looked up at the brace installation structure of the roof steel frame which shows other embodiment of this invention from the downward direction. It is the figure which looked up at the brace installation structure of the roof steel frame which shows other embodiment of this invention from the downward direction. It is a vertical side view of the principal part which shows the state which installed the brace. It is a figure explaining an example of a beam steel frame of section H shape.

Explanation of symbols

S Gap 1 Beam steel frame for large beams 1b Lower flange 2 Beam steel frame for small beams 2b Lower flange 3 Splice plate 4 Bolt / Nut 7 Brace 8 Turnbuckle 9 Brace material 10 Hook 11 Gusset plate 12 Flat plate

Claims (4)

  A roof steel frame reinforced with braces spanning a steel beam on both sides of the steel beam on both sides in a diagonal direction. The brace installation structure, comprising the brace of a brace material with a turn buckle and hooked gusset plates connected to both ends thereof, hooking the hooked gusset plates on the lower flanges of the beam steel frame on both sides, A roof steel brace installation structure characterized by being fastened and fixed by the turnbuckle.   The roof steel brace installation structure according to claim 1, wherein the gusset plate with a hook is constituted by a flat plate portion and a hook having a shape bent at a right angle in a plan view and connected to the tip thereof. A roof steel brace installation structure characterized in that a plate is hooked to a corner portion on the outer side of a lower flange in a beam steel frame for small beams on both sides, and is fastened and fixed by the turnbuckle.   The roof steel brace installation structure according to claim 1, wherein the gusset plate with a hook is composed of a flat plate portion and a wide hook connected to the tip of the gusset plate, and the gusset plate with the hook is used for a large beam on both sides. A roof steel brace installation structure characterized in that it is hooked to the outer edge of the lower flange of the beam steel frame and fastened and fixed by the turnbuckle.   2. A roof steel brace installation structure according to claim 1, wherein a gusset plate with a hook formed of a flat plate portion and a hook bent at a right angle in a plan view is provided for a small beam on both sides. The steel frame is hooked to the outer corner of the lower flange and fastened with the turnbuckle while the gusset plate with hooks composed of a flat plate and a wide hook connected to the tip of the plate is used for the large beams on both sides. A roof steel brace installation structure characterized in that it is hooked to the outer edge of the lower flange of the beam steel frame and fastened and fixed by the turnbuckle.

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