JP4357444B2 - Thin steel beam - Google Patents

Description

  The present invention relates to a thin-walled steel beam that is assembled using thin-walled steel and is used for roofs, ceilings, floors, and the like in various buildings.

  In various buildings such as store buildings and office buildings, a short depreciation type thin steel material having a wall thickness of 3 mm or less may be used for the beam. When assembling a beam with thin steel material, a truss structure by welding was used to make a long span.

  However, when assembling the truss frame by welding, specialized technology is required and technology for ensuring dimensional accuracy is required, and a high skill level is required. In particular, it is necessary to cut the upper and lower ends of the diagonal material obliquely, which makes it difficult to ensure accuracy and is a laborious operation. Therefore, it cannot be easily joined and assembled. Moreover, since it is based on welding, it cannot be disassembled at the member level, and the member cannot be reused. In the case of a building that is supposed to be demolished or relocated in a short period of several years to several tens of years, it is strongly desired to reuse the members.

  The object of the present invention is a beam using thin-walled steel, but it does not require welding, can be easily joined and assembled, improves dimensional accuracy, stabilizes quality, and can be disassembled at the member level. An object of the present invention is to provide a thin-walled steel beam that can be easily reused.

The thin steel beam according to the present invention includes an upper chord material made of a thin steel material, a lower chord material made of a thin steel material, and a face material stretched over substantially the entire length between the upper chord material and the lower chord material. The face material and the upper chord material and the lower chord material are joined by a fastener that performs mechanical joining such as screws or pins.
According to this configuration, the compression / tensile force generated by the supporting load is borne by the chord material, and the shearing force acting on the entire beam is borne by the resistance of the face material. As a result, the face material functions as a substitute for the diagonal member of the truss frame, and the required strength is ensured even when a long span beam is used. Since the face material is stretched over the entire length between the upper chord material and the lower chord material, the joint between the face material and the upper and lower chord materials with fasteners such as screws can be performed at a fine pitch. It is possible to join the face material and the upper and lower chord materials easily and firmly. This also makes it easy to make a long span beam.
In addition, since the face material and the upper and lower chord materials are mechanically joined with fasteners such as screws, components such as the face material and the upper and lower chord materials are prepared in advance before construction on site. As a component. Even when a bundle material or the like is provided, mechanical joining by the fasteners is possible, and a component can be obtained. As a result, the dimensional accuracy can be improved and the quality can be stabilized. Also, disassembly at the member level is possible, and therefore, it is easy to reuse each member after disassembly.

In the present invention, the upper chord member and the lower chord member may be square pipes, the two face members may be provided in parallel, and the upper and lower edges of each face member may be joined to the side surfaces on both sides of the upper chord member and the lower chord member, respectively.
In this way, by adopting a configuration in which the two face members are stretched on both sides of the upper and lower chord members, a cross-section becomes a box-shaped beam, and a strong structure in which the face member does not easily corrugate can be obtained.

When the upper and lower chord members are made of square pipe, square pipe bundles are provided at a plurality of locations in the longitudinal direction between the upper chord member and the lower chord member, and the upper and lower ends of the bundle member and the upper chord member and the lower chord member are You may provide the joint metal | medium group which each joins. These metal fittings are composed of, for example, a pair of substantially hat-shaped bundled metal fittings facing each other, and the pair of bundled metal fittings are fitted to the upper chord material or the lower chord material from both sides, respectively. A projecting piece portion that projects upward and downward with respect to the groove-shaped portion, and the projecting piece portion that protrudes toward the bundle member is inserted into the bundle member and fixed to the bundle member with a fastener. To do.
By providing the bundle material, the strength of the thin-walled steel beam is improved and the joining of the orthogonal chord materials becomes easy. When the bundle member is provided, by providing the above-described joint hardware set, the bundle member can be easily joined to the upper and lower chord members with a fastener. This facilitates the joining and disassembly of the upper and lower string members and the bundle member.

When the bundle material is provided as described above, the U-shaped orthogonal chord material joint metal fitting in which the intermediate piece portion is sandwiched between the bottom surface of the groove-shaped portion of the bundle metal joint material and the surface of the upper chord material or the lower chord material is used. An end portion of the upper chord member or the lower chord member in a direction orthogonal to the thin-walled steel beam may be joined between the opposed piece portions of the orthogonal chord member joining hardware.
In this way, by combining the hat-shaped bundled metal joint and the U-shaped orthogonal chord material joint, it is possible to join the orthogonal thin-walled steel beam with a fastener such as screws. Therefore, it is possible to easily join and dismantle the thin-walled steel beams that are orthogonal to each other.

In the present invention, the upper chord member and the lower chord member may be formed of a pair of divided chord members that sandwich the upper and lower edges of the face member from both sides, respectively.
In the case of this configuration as well, each component member is joined to each other with a fastener such as screws, so that dimensional accuracy can be improved, stable quality can be ensured, and disassembly at the member level is facilitated. For this reason, reuse of each member after disassembly becomes easy.

  The thin steel beam of the present invention comprises an upper chord material made of a thin steel material, a lower chord material made of a thin steel material, and a face material stretched over substantially the entire length between the upper chord material and the lower chord material. Since the surface material and the upper chord material and lower chord material are joined by fasteners that perform mechanical joining such as screws or pins, welding is not required even though the beam uses thin-walled steel. , Assembly can be performed, dimensional accuracy can be improved, quality can be stabilized, disassembly can be performed at the member level, and the member can be easily reused.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a front view of the thin steel beam 1 and FIG. 2 shows a cross-sectional view taken along the line II-II in FIG. As shown in FIG. 1, the thin steel beam 1 is stretched over substantially the entire length between an upper chord member 2 made of a thin steel member, a lower chord member 3 made of a thin steel member, and the upper chord member 2 and the lower chord member 3. And face material 4. The thin-walled steel material referred to here is a steel material having a wall thickness of 3 mm or less. The upper chord material 2 and the lower chord material 3 are formed of square pipes. The face material 4 is made of a structural plywood or a thin steel plate. The face material 4 is provided in parallel so that the upper chord material 2 and the lower chord material 3 are sandwiched, and the upper and lower edges of each face material 4 are fastened to the side surfaces of both sides of the upper chord material 2 and the lower chord material 3 with a tapping screw with a drill, They are joined with the tool 5.

  At a plurality of locations in the longitudinal direction between the upper chord member 2 and the lower chord member 3, square pipe bundle members 6 are provided. The upper and lower ends of the bundle member 6 and the upper chord member 2 and the lower chord member 3 are joined together by a joint hardware set 7. These joint hardware sets 7 are composed of a pair of bundle material joints 8 and 8 facing each other as shown in FIG. As shown in FIGS. 5A and 5B in a front view and a side view, the bundled metal fitting 8 includes a groove-shaped portion 8a and an overhanging piece portion 8b projecting up and down with respect to the groove-shaped portion 8a. , 8c.

  As shown in the perspective view of FIG. 7, the grooved portions 8a and 8a of the pair of metal fittings 7 are fitted to the upper chord material 2 or the lower chord material 3 from both sides as shown in the perspective view of FIG. It is configured so as to face each other. The upper chord member 2 or the lower chord member 3 is joined to the joint hardware set 7 by joining the two projecting piece portions 8b, 8b and the other projecting piece portions 8c, 8c to each other. As shown in FIG. 5, the two protruding piece portions 8b and 8b and the two protruding piece portions 8c and 8c are joined to the bolt insertion holes 9 and 10 provided in the protruding piece portions 8b and 8c as shown in FIG. Thus, the bolts 13 and 14 are inserted, and nuts 15 and 16 are screwed into the bolts 13 and 14 and fastened.

  The projecting piece portions 8c and 8c are portions protruding toward the bundle member 6 and are inserted into the bundle member 6 as shown in FIG. 4 and fixed to the bundle member 6 by bolts 17 and nuts 18 serving as fasteners. . That is, another bolt insertion hole 12 is provided in the overhanging piece portion 8c as shown in FIG. 5, and the bolt insertion hole 12 of the overhanging piece portion 8c from the bolt insertion hole 19 (FIG. 7) provided in the bundle member 6. The projecting piece portions 8 c and 8 c are fixed to the bundle member 6 by screwing the nut 18 outside the bundle member 6 to the bolt 17 penetrating through the bundle member 6. The end portions of the face members 4 are respectively coupled to the side surfaces on both sides of the bundle member 6 by a fastener 5 such as a drill screw.

  As shown in FIG. 2, another thin-walled steel beam 1 </ b> A orthogonal to the thin-walled steel beam 1 is connected to the installation position of the bundle 6 in the thin-walled steel beam 1. This thin steel beam 1A is also composed of an upper chord member 2A and a lower chord member 3A made of square pipes, and two steel plate face members 4A joined to the side surfaces on both sides of the upper chord member 2A and the lower chord member 3A. The end portions of the material 2A and the lower chord material 3A are connected to the joint hardware set 7 via the orthogonal chord material joint hardware 20. The upper and lower edges of each face material 4A are connected to the side surfaces on both sides of the upper chord material 2A and the lower chord material 3A with fasteners 5 such as a tapping screw with a drill as in the case of the thin steel beam 1 described above. It is.

  The orthogonal chord material joining hardware 20 is a member having a U-shaped cross section as shown in the plan view, the front view and the side view in FIGS. 6 (A) to 6 (C), and the intermediate piece portion 20a thereof is shown in FIG. In this way, by being sandwiched between the bottom surface of the groove-shaped portion 8 a of the bundle member 8 and the surface of the upper chord member 2 or the lower chord member 3, it is connected to the joint member set 7. As shown in FIG. 3 showing an enlarged view of part A in FIG. 1 and FIG. 4 showing an enlarged view of part B in FIG. 2, a thin steel beam is formed between the opposing piece portions 20 b and 20 b of the orthogonal chord material joint hardware 20. The ends of the upper chord material 2A or the lower chord material 3A of 1A are fitted and joined by bolts 21 and nuts 22 which are fasteners, whereby the thin-walled steel beam 1A is connected to the bundled metal fitting 8.

  Bolt insertion holes 23 (FIG. 6) are provided in the opposing piece portions 20b, 20b of the orthogonal chord material joint metal 20, and are orthogonal to the bolt insertion holes 24 (FIG. 7) provided on the side surfaces of the upper chord material 2A or the lower chord material 3A. By inserting a bolt 21 through the bolt insertion hole 23 of the string material joint 20 and screwing a nut 22 into the bolt 21, the end portion of the upper chord material 2A or the lower chord material 3A of the thin-walled steel beam 1A is made. Joined to the orthogonal chord material joining hardware 20.

According to the thin steel beam 1 having the above configuration, the upper chord member 2 and the lower chord member 3 bear the compressive / tensile force generated by the supporting load, and the face member 4 resists the shearing force acting on the entire beam. Therefore, the required strength is ensured even when the face material 4 functions as a substitute for the diagonal member of the truss frame so as to be a long span beam. Since the face material 4 is stretched over the entire length between the upper chord material 2 and the lower chord material 3, the joint between the face material 4 and the upper and lower chord materials 2, 3 by the fasteners 5 such as screws is not performed. The surface material 4 and the upper and lower chord materials 2 and 3 can be joined easily and firmly. This also makes it easy to make a long span beam.
The vertical load acting on the metal joint assembly 7 at the installation position of the bundle member 6 is supported by a bolt 17 that penetrates the bundle member 6 and connects the protruding piece portion 8c of the bundle member joint metal 8 and the bundle member 6. It is transmitted to the bundle 6.
Further, the load acting on the upper chord material 2A and the lower chord material 3A of the thin steel beam 1A orthogonal to the thin steel beam 1 is a pair of opposing piece portions 20b, 20b of the orthogonal chord material joint metal 20 and the upper chord material 2A. It is supported by a bolt 21 that penetrates the lower chord material 3 </ b> A, and is transmitted from the orthogonal chord material joining hardware 20 to the joining hardware set 7.

  Thus, the thin-walled steel beam 1 of this embodiment extends over the entire length between the upper chord material 2 made of thin-walled steel, the lower chord material 3 made of thin-walled steel, and the upper chord material 2 and the lower chord material 3. Since it is composed of the stretched face material 4, these members can be joined to each other with a fastener 5 such as a bolt or a screw. Therefore, it becomes possible to make these components into parts, so that dimensional accuracy can be improved and quality can be stabilized. Also, disassembly at the member level is possible, and therefore, it is easy to reuse each member after disassembly.

  Further, in this embodiment, the upper chord material 2 and the lower chord material 3 of the thin steel beam 1 are square pipes, two face materials 4 are provided in parallel, and the upper and lower edges of each face material 4 are the upper chord material 2 and the lower chord material 3. Since the cross section of the beam is box-shaped, the face material 4 is not easily corrugated and is thus a rigid beam.

  Further, in this embodiment, square pipe bundles 6 are provided at a plurality of locations in the longitudinal direction between the upper chord member 2 and the lower chord member 3 of the thin-walled steel beam 1, and the upper and lower ends of the bundle member 6 and the upper chord member 2 and Since the joint hardware set 7 for joining the lower chord material 3 is provided, and the joint hardware set 7 is constituted by a pair of substantially hat-shaped bundle material joint hardware 8 and 8 facing each other, the upper chord material 2 and the lower chord material 3 Bonding with the bundle material 6 and disassembly become easy.

  Further, a U-shaped orthogonal chord material joint metal 20 in which an intermediate piece portion 20a is sandwiched between the bottom surface of the groove-shaped portion 8a of the bundle material joint 8 and the surface of the upper chord material 2 or the lower chord material 3 is provided. Since the end portions of the upper chord material 2A or the lower chord material 3A in the direction orthogonal to the thin steel beam 1 are joined between the opposing piece portions 20b, 20b of the orthogonal chord material bonding hardware 20, the orthogonal chord material 1A and the thin steel beam 1A are orthogonal to each other. Joining and disassembly can be performed easily.

  FIG. 8 shows a cross-sectional view of another embodiment of the present invention. In the thin-walled steel beam 31, the face material 34 is a plurality of overlapping materials, the upper chord material 32 is a pair of divided chord materials 32 a and 32 a sandwiching the upper edge of the face material 34 from both sides, and the lower chord material 33 is A pair of divided chord members 33a and 33a sandwiching the lower edge of the face member 24 from both sides are provided. The face material 34 is, for example, a superposed material of a steel plate 34a and a pair of plywoods 34b and 34b sandwiching the steel plate 34a from both sides. A structural plywood or the like is used for the plywoods 34b and 34b. The steel plate 34a and the plywoods 34b and 34b may be simply stacked or may be bonded to each other. The divided chord members 32a and 33a of the upper chord member 32 and the lower chord member 33 are made of, for example, a C-shaped steel made of thin steel. The pair of divided chord members 32a, 32a of the upper chord member 32 and the upper edge of the face member 34, and the pair of divided chord members 32a, 33a of the lower chord member 33 and the lower edge of the face member 34 are a bolt 35 and a fastener. Joined with a nut 36.

Even in the case of the thin-walled steel beam 31 having this configuration, the compressive / tensile force generated by the supporting load is borne by the upper and lower chord members 32 and 33, and the shearing force acting on the entire beam is borne by the face material 34 resisting. To do. As a result, the face material 34 functions as a substitute for the diagonal member of the truss frame, so that the required strength is ensured even when a long span beam is used.
Further, since each component member is mechanically joined to each other with a fastener including a bolt 35 and a nut 36, the component members such as the face member 34 and the upper and lower chord members 32, 33 can be made into parts. It becomes possible. As a result, the dimensional accuracy can be improved and the quality can be stabilized. Also, disassembly at the member level is possible, and therefore, each member after disassembly is easily reused.

  Although the face member 34 may be composed of a single steel plate, as described above, the plywood 34b, 34b is overlapped on both surfaces of the steel plate 34a, thereby preventing the corrugation of the steel plate 34a. Further, when the plywoods 34b and 34b are stacked on both surfaces of the steel plate 34a, the plywoods 34b and 34b on both sides do not necessarily have to be directly joined to the chord materials 32 and 34. For example, the plywoods 34b and 34b may be provided so as to overlap only between the upper and lower divided string members 32a and 32a of the steel plate 34a and the portion excluding the portion sandwiched between the divided string members 33a and 33a, and may be attached to the steel plate 34a.

  Also in the first embodiment shown in FIGS. 1 to 7, the face material 4 may be a plurality of superposed materials as in the embodiment of FIG. 8 and the like.

It is a front view of the beam made from thin steel materials concerning a 1st embodiment of this invention. It is II-II arrow sectional drawing in FIG. It is an enlarged view of the A section in FIG. It is an enlarged view of the B section in FIG. (A) is a front view of a bundle-joint metal fitting, (B) is the same side view. (A) is a top view of an orthogonal chord material joint metal fitting, (B) is the front view, (C) is the side view. It is a perspective view which shows the assembly | attachment structure of a bundle material joining metal fitting and an orthogonal chord material joining hardware. It is sectional drawing of the thin-walled steel beam concerning other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A, 31 ... Thin-walled steel beam 2, 2A ... Upper chord material 3, 3A ... Lower chord material 4, 4A ... Face material 5 ... Fastener 6 ... Bundling material 7 ... Bonding metal set 8 ... Bundling material joining metal 8a ... Groove Shape part 8b, 8c ... Overhang piece part 17 ... Bolt (fastener)
18 ... Nut 20 ... Orthogonal chord material joint 20a ... Intermediate piece portion 20b ... Opposing piece portion 31 ... Thin steel beam 32 ... Upper chord material 32a ... Divided chord material 33 ... Lower chord material 33a ... Divided chord material 34 ... Face material 34a ... Steel plate 34b ... Plywood

Claims (5)

  An upper chord material made of thin steel material, a lower chord material made of thin steel material, and a face material stretched over the entire length between the upper chord material and the lower chord material, and this face material and the upper chord material and the lower chord material A thin-walled steel beam that is joined with a fastener that performs mechanical joining such as screws or pins.   2. The thin chord material according to claim 1, wherein the upper chord material and the lower chord material are square pipes, the two face materials are provided in parallel, and the upper and lower edges of each face material are joined to the side surfaces on both sides of the upper chord material and the lower chord material, respectively. Beams.   3. A bundle of square pipes is provided at a plurality of locations in the longitudinal direction between the upper chord member and the lower chord member according to claim 2, and a joint metal assembly for joining the upper and lower ends of the bundle member to the upper chord member and the lower chord member is provided. These joint hardware sets consist of a pair of substantially hat-shaped bundle material joints facing each other, and the pair of bundle material joints have their groove-shaped portions fitted to the upper chord material or the lower chord material from both sides, respectively. Made of thin-walled steel material that is joined to each other by projecting piece parts that project upward and downward with respect to the groove-shaped part, and the projecting piece parts that protrude toward the bundle material are inserted into the bundle material and fixed to the bundle material with fasteners. Beams.   4. The orthogonal chord string joint metal fitting in which an intermediate piece portion is sandwiched between the bottom surface of the groove-shaped portion of the bundle joint metal fitting and the surface of the upper chord member or the lower chord member according to claim 3 is provided. A thin steel beam made by joining the end portions of the upper chord material or the lower chord material in a direction perpendicular to the thin steel beam between opposing pieces of the metal joint.   2. The thin-walled steel beam according to claim 1, wherein the upper chord member and the lower chord member are each composed of a pair of split chord members that sandwich the upper and lower edges of the face member from both sides.

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