WO2001090498A1

WO2001090498A1 - Joint structure of building using thin-plate, light-gauge steel

Info

Publication number: WO2001090498A1
Application number: PCT/JP2000/003371
Authority: WO
Inventors: Yoshimichi Kawai; Jun Shimizu
Original assignee: Nippon Steel Corporation
Priority date: 2000-05-25
Filing date: 2000-05-25
Publication date: 2001-11-29
Also published as: CN1376227A; US20030213194A1

Abstract

A joint structure of a building using a thin-plate, light-gauge steel, wherein, especially, a joint structure for tightly joining a building frame member using a thin-plate, light-gauge steel with a steel joist, and a bolt-joined trussed structure serving as a main roof structure are used to provide a steel building that can survive severe earthquakes and strong winds such as typhoons. A joint structure of a building using thin-plate, light-gauge steel formed by inserting and fixing, into and to a connection section for tightly joining a steel frame member forming a wall with a steel joist, a steel reinforcing member having a section area equivalent to or at least 70% of the section area of the steel frame member. Alternatively, a joint structure of a building using a thin-plat, light-gauge steel, which is a trussed structure formed by assembling, in a trussed form, thin-plate, light-gauge steel-made upper chord members, lower chord members and lattice members, and which is constituted by connecting together the joint portions of the upper chord members, lower chord members and lattice members to form a joint unit and by inserting fasteners into joint through holes, formed at least one each in each joint portion of each member, to join and fix each member together.

Description

Description Jointed structure of buildings using thin, lightweight steel bars

TECHNICAL FIELD The present invention relates to a joint structure of a building using a thin lightweight steel plate, and more particularly to a joint structure of a building made of earthquake-resistant and wind-resistant steel, and a frame material of a building using the thin lightweight steel plate as a frame material or the like. It relates to a joint structure for connecting steel and steel joists and a bolted truss structure that is the main structure of the roof. In addition, the thin-plate lightweight section steel referred to in the present invention refers to each member of a building structure made of a section steel obtained by processing a thin steel sheet having a thickness of 2.3 mm or less.

Background art

In recent years, buildings made of earthquake-resistant and wind-resistant steel have been in the spotlight, but this steel building is formed by forming a thin steel sheet with a thickness of 2.3 mm or less into a shaped steel by roll forming. The building frame is constructed by using shaped or bent shaped steel as a frame material, joist or roof material, and reinforcing each member with screws or connecting each member with screws. Conventionally, in this steel building, there are many joints for joining and joining each member. For example, the part where the upper and lower joists are tied to the frame material, the frame materials are tied together, the frame material is tied to the steel or concrete foundation, and the roof truss structure is tied to the upper chord material It is the part that binds the upper chord and lower chord, or the lattice that connects the upper chord and lower chord. In most cases, a reinforcing hardware or a connecting hardware is used for reinforcement at these binding parts. In the case of a roof structure, when constructing a mountain-shaped roof truss made of steel with a thickness of about 1 mm, two upper chords, one lower chord and a lattice The materials are arranged in a triangular shape and temporarily fixed with jigs, etc., and the joints between the chords are joined by drilling tapping screws.

The joint structure for fastening and fixing the above-described members will be described based on the joint structure that has been conventionally implemented based on FIG.

First, as shown in Fig. 1, the joints between the joists and the frame material and the frame material's joint structure are as follows: frame material 1 forms the upper floor support, and frame material 2 forms the lower floor support The ends of these frame members are connected to the tracks 3 and 4 at right angles in a T-shape, and a joist 5 is bridged between the tracks 3 and 4 in a direction perpendicular to the joist 5. Then, a joist 6 is attached, and a floor 7 is laid directly above the joist 6. A side wall member 8 forming a wall is stretched on the side surface of the joist 5 to form a wall.

The frame member 1 and the frame member 2 are not an integral structure penetrating the upper floor and the lower floor, but are an assembly structure. Therefore, there is a space between the joists 5 and 6 between them. In this space, the joists 5 and 6 are connected and abutted at right angles at the joist 6 immediately below the frame 1 and directly above the frame 2. Naturally, the joint at the contacting portion needs to be reinforced. Conventionally, a member 9 made of a thin steel plate obtained by simply bending a flat steel plate at a right angle is screwed or riveted to the joint.

However, the member 9 has a cross-sectional area of only about 50% at most as compared with the joint area for the purpose of weight reduction, and is insufficient in strength. In particular, in the event of a large earthquake or strong wind, a considerable force is applied to the building structure, and tensile or compressive force acts on the frame material, and the floor material or ceiling material is locally deformed as the joists 5 and 6 are deformed. As a result, the house is inclined and the living environment deteriorates.

On the other hand, as shown in FIGS. 2 (a) and 2 (b), a hole-down metal 21 is used to fix the frame 2 to a steel or concrete base 10. The hole-down hardware 21 is made of a steel material The plate 22 is connected by connecting means such as screws. The hold-down hardware 21 is formed of steel side plates 23 and 24 and a bottom plate 25 attached between the side plates and attached to the sides 23 and 24 described above. In the vicinity of the center of the bottom plate 25, the anchor bolts and the hole-down hardware 21 are tightened by passing the anchor bolt holes of the steel or concrete foundation 10 through the bolt holes 26. In many cases, the diameter of the bolt holes provided in the bottom plate 25 is the same as or very slightly larger than the diameter of the anchor bolts, so that each member manufactured in advance at the factory, especially the hole-down hardware 21 described above. It is often difficult to assemble because the hole positions and anchor bolt holes do not match. When the bottom plate 25 is provided above the hole-down metal member 21 as shown in FIG. 2 (b), the hole-down metal member 21 is deformed when the anchor-bolt tightening is strengthened.

Next, the joining structure in the roof structure will be described. In the conventional roof structure, as shown in Fig. 5 (a), both ends of the upper chord 50, 51 and the lower chord 5 made of shaped steel having a thickness of about lmm are connected to the ends of the upper chord, thereby forming a mountain shape. Lattice material 53 that is skewed is attached if necessary, temporarily fixed with a jig, and the joint between the string materials is joined by drilling tapping screws 54. In this roof truss structure, a jig for temporarily fixing the upper chords 50 and 51 and the lower chord or the lattice 53 is required, and this jig and each chord are installed. Therefore, it is necessary to provide a horizontal plane with a higher accuracy than the size of the roof truss, and it is difficult to secure that space on site. Therefore, the roof truss completed on the ground is lifted to the ceiling and transported. It has been installed. This completed roof truss has a problem that it is difficult to handle due to its size and weight.

Also, connect the drilling tapping screw 54 to the upper chord material 50, 51 and the lower chord. Although it is necessary to drive into the joints of the strings, the joints of each chord are usually screwed with at least four drilling tapping screws, but depending on the size of the roof truss More screws must be used, and a considerable number of screws must be used to obtain the required bonding strength due to the low strength per screw screw, and a maximum of about 20 screws must be used. The amount of screwing work for this is large and inefficient, and it is necessary to accurately arrange each string material for the screwing position alignment. Providing such materials requires a large amount of work in the off-line operation, and because many screws are applied to narrow joints, the strength of the joints is reduced by screwing at small intervals longer than a specified interval. Have a problem. To make matters worse, there is a problem that local buckling occurs because the thickness of each of these chord members is as thin as about 1 mm. Disclosure of the invention

The present invention relates to a joint structure of a building using a thin lightweight steel plate, and more particularly to a joint structure of a building made of earthquake-resistant and wind-resistant steel, in which a thin lightweight steel plate is used as a frame material or the like. The present invention provides a joint structure that can solve the above-mentioned problems at once. In other words, in the joint structure that connects the frame material and the steel joist, steel reinforcing members that take into account the reinforcing strength in relation to the cross-sectional area of the frame material, and the joists that form the upper and lower floors are connected to the frame material. The present invention provides a steel joint structure for joining a frame material and a steel or concrete foundation. Furthermore, in the present invention, it is possible to easily cope with a change in the roof gradient in the bolted joint structure of the roof truss, etc., and it is easy to construct the truss due to dimensional errors, etc. It is intended to provide a joint structure capable of improving work efficiency. The present invention provides means for achieving the above-mentioned object, and the gist is as follows.

(1) A steel cap having a cross-sectional area equal to or greater than 70% of the cross-sectional area of the above-mentioned steel frame material at the connecting part that connects the steel frame material forming the wall and the steel floor joist. A jointed structure for buildings that uses thin, light-weight shaped steel that features imported and fixed components.

(2) Steel that has a steel frame material that forms the wall and a bolt-through hole that is at least 1.5 times the diameter of the bolt at the joint that connects the steel or concrete foundation with bolts A jointed structure for buildings using thin, lightweight section steel, characterized by inserting and fixing metal fittings made of steel.

(3) The joint according to (2), wherein the connecting hardware is combined with an attachment plate having a bolt through hole having the same diameter as the bolt through hole or a bolt through hole larger than the bolt diameter. This is a joint structure for buildings using thin lightweight steel.

(4) A truss structure in which the upper chord, the lower chord and the lattice are assembled in a truss-like shape with thin, lightweight steel, and at least one joint is formed at the joint of the upper chord, the lower chord and the lattice. A thin plate having a through-hole, a structure in which the joining portions of the members are connected to each other to form a joining portion, and a fastener is inserted into the joining through-hole to fasten and fix each member. Building joint structure using lightweight section steel.

(5) Fastening each member by abutting a metal joint having at least one or more joint through-holes so as to match the joint through-holes provided at the joint between the upper chord, lower chord and lattice. · The joint structure of the building using the thin and light section steel described in (4), characterized in that the structure is fixed o

(6) The building using a thin, lightweight section steel according to (5), wherein the metal joint is a steel washer or a sash having a plate thickness of 1.6 mm or more. Building joint structure.

(7) A steel house having a joint structure for a building using the thin lightweight steel plate according to any one of (1) to (6). BRIEF DESCRIPTION OF THE FIGURES

Figure 1 shows the joint structure of steel frame joists and steel frame members by a conventional method.

Figure 2 shows the joint structure between the vertical frame material and the base of a steel building by the conventional method.

FIG. 3 is a view showing a joining structure of a vertical frame member and a steel joist of a steel building according to the present invention.

FIG. 4 is a diagram showing a joint structure between a vertical frame member and a base of a steel building according to the present invention.

FIG. 5 is a diagram showing a joint structure in a truss structure of a steel building according to the conventional method and the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 3 shows a joining structure for tightly joining the frame members according to the present invention. In Fig. 3, Frame 1 forms the pillars of the upper floor, Frame 2 forms the pillars of the lower floor, and the ends of these frames are joined to the tracks 3, 4 at right angles to the T-shape. Further, a joist 5 is attached between the tracks 3 and 4, a joist 6 is attached in a direction orthogonal to the joist 5, and a floor 7 is laid directly above the joist 6. . On the other hand, on the side of the joist 5, a side wall material 8 forming a wall is provided. The frame members 1 and 2 are not an integral structure that penetrates the upper and lower floors, but are an assembled structure. Therefore, the joists 5 and 6 are placed between them. There is an intervening space. In this space, the joists 5 and 6 are connected and abut at right angles directly below the frame 1 and immediately above the frame 2. This structure is the same as the embodiment shown in FIG.

However, the major difference from the conventional structure in Fig. 1 is that in the conventional structure, the joist 6 is connected to the side face of the joist 5 at right angles. Since the steel member 9 is only reinforced with screws or rivets, its structural strength is insufficient during a disaster such as an earthquake. In other words, the member 9 has a cross-sectional area of only about 50% at most as compared with the joint area for the purpose of weight reduction, and thus has insufficient strength. In particular, in the event of a large earthquake or strong wind, considerable force is applied to the building structure, and tensile or compressive force acts on the vertical frame material, and the floor material or ceiling material is locally deformed as the joists 5 and 6 are deformed. Deformation will cause the house to tilt and the living environment to deteriorate.

Therefore, in the reinforcing joint structure according to the present invention, a reinforcing member 9 'made of rope having a cross-sectional area equal to or more than 70% or more than the cross-sectional area of the frame member having a rectangular shape or a groove shape is inserted and fixed. As shown in the drawing / enlarged portion of FIG. 3, the concrete structure is to attach a steel reinforcing member 9 'having a rectangular shape and a groove shape to the steel reinforcing member. By attaching such a steel reinforcing member 9 ′ having a large cross-sectional area, it is possible to sufficiently withstand, for example, a large earthquake with a seismic intensity of 5 or more and a storm with a wind speed of 30 m / sec or more. However, if it exceeds 100% of the cross-sectional area of the frame member of the steel reinforcing member 9 ′, the weight increases and the joint becomes too strong, so that the cross-sectional area of the steel reinforcing member 9 ′ is increased. Is preferably equal to the cross-sectional area of the frame material or 70% or more. On the other hand, in fixing the foundation of the steel building in the present invention, as shown in FIG. 4, a bottom plate 25 serving as a connecting portion for connecting the frame member 2 and the steel or concrete foundation 10 is provided. , Preferably at least 1.5 times the bolt diameter The bolt through-hole 27 is provided, and the bolt through-hole 29 in the attachment plate 28 is provided with a bolt through-hole having substantially the same diameter as the bolt diameter. Here, the bolt hole diameter provided on the bottom plate 25 is 1.5 times or more the bolt diameter.For example, for a bolt of 16 mm diameter, a bolt through hole of 24 mm or more, and a bolt of 19 mm diameter By using a bolt through hole of 28.5 mm or more, it is possible to absorb construction errors. When the diameter of the bolt through-hole is further increased, it is a matter of course that the strength cannot be increased because the strength is reduced.

Further, as shown in FIG. 5 (b), the roof structure according to the present invention has two ends of the upper chord members 50, 51 and the lower chord member 52 made of a thin steel plate having a thickness of 2.3 mm or less. A truss structure which is assembled in a truss shape by being connected to the end of the upper chord material, where a skewed lattice material 53 is attached if necessary, and the upper chord material 50, lower chord material 52 and lattice material 53 are attached. At least one fastener hole 55 is drilled and provided on the ground in advance at the front end joint, and each member joint is overlapped to form a joint joint 56, and the fastener hole 55 is formed. A truss structure is used in which a fastener 57 such as a connecting bolt is fastened to each member to fasten and fix each member. In addition, a joint metal part 56 is fitted to a fastener hole position provided in advance at a connecting portion of the upper chord members 50, 51, the lower chord member 52, and the lattice member 53, and at least one joint which can be joined with a connecting bolt is provided. A truss structure in which a metal joint 56 having at least one fastener hole 58, and preferably a member such as a steel washer or a washer having a plate thickness of 1.6 mm or more abuts and is fastened and fixed. Is preferred. It is preferable that the diameter of the through hole of the fastener such as the steel washer or the washer has a large diameter of the bolt head from the viewpoint of increasing the strength.

In the roof structure of a building according to the present invention having such a configuration, since the members to be joined can be accurately arranged only by aligning the through holes, the on-site assembling work is greatly improved. What used to be joined with ~ 6 bolts can be easily joined with one bolt, greatly reducing joining work.

The present invention has an effect on application to a steel house as a building made of earthquake-resistant and wind-resistant steel. Industrial applicability

INDUSTRIAL APPLICABILITY As described above, the present invention relates to a joining structure of a building using thin lightweight steel, particularly, a joining structure for joining a frame material of a building using thin lightweight steel as a frame material and a steel joist. Bolt-joint truss structure, which is the main structure of the structure and roof, can be easily provided, and it is possible to provide a steel building that can withstand strong winds such as large earthquakes and typhoons, and can significantly improve workability. It has the effect of.

Claims

The scope of the claims

1. A steel reinforcing member having a cross-sectional area equal to or greater than 70% of the cross-sectional area of the above-mentioned steel frame material is connected to the joint between the steel frame material forming the wall and the steel floor joist. Introduced · A jointed structure of buildings using thin, lightweight section steel that is fixed.

2. A steel frame material that has a bolt through-hole that is at least 1.5 times as large as the bolt diameter at the joint that connects the steel frame material that forms the wall and the steel or concrete foundation with a bolt. A jointed structure for buildings using thin, lightweight section steel, characterized by inserting and fixing connecting hardware.

3. The light weight of the thin plate according to claim 2, wherein the connecting metal has a joining structure in which an attachment plate having a bolt through hole having the same diameter as the bolt through hole or a bolt through hole larger than the bolt diameter is combined. A joint structure for buildings using shaped steel.

4. A torus structure in which the upper chord material, lower chord material and lattice material are assembled into a torus in a thin lightweight steel plate, and at least one or more joints between the upper chord material, lower chord material and lattice material are provided. A thin plate having a joining through hole, wherein each member is joined to form a joining portion by connecting the joining portions, and a fastener is inserted into the joining through hole to fasten and fix each member. Building joint structure using lightweight section steel.

5. Fastening each member by contacting a metal joint having at least one joint through hole so as to match the joint through hole provided at the joint between the upper chord material, the lower chord material and the lattice material. The joint structure of a building using the thin lightweight steel plate according to claim 4, wherein the joint structure is fixed.

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6. The thin, lightweight steel plate according to claim 5, wherein the metal joint is a steel washer or a sash having a plate thickness of 1.6 mm or more. Building joint structure.

7. A steel house characterized by having a joint structure for a building using the thin and light-weight shaped steel according to any one of claims 1 to 6.