JPH055933U - Lightweight steel reinforcement panel - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] With the weight reduction of fiber-reinforced cement panels that form the surface material of outer walls, columns and beams attached to the building frame, the lightweight steel frame that reinforces the panels has been improved. Provides fixation. [Structure] A lightweight steel frame reinforcing panel in which a lightweight steel frame is screwed through bolts to a plurality of insert nuts embedded in a peripheral edge portion and / or a central portion of a fiber-reinforced cement panel 1, wherein the lightweight steel frame 6 is used. The hole diameters of the two bolt holes formed on one side in the lateral direction are slid or loosely engaged with the bolts so that the bolts are welded to the lightweight steel frame 6 to be positioned and fixed, and the hole diameters of the other bolt holes. Is bored so as to be loosely fitted to the bolt, and the tightening torque of the bolt screwed into the insert nut via the spring washer is set to 300 kg-cm or less.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an improvement of a building fiber-reinforced cement panel for forming a surface material for an outer wall, a pillar, or a beam attached to a building body.

[0002]

[Prior Art]

 A fiber-reinforced cement panel is generally used as a reinforcement rib system in which a reinforcement rib portion is formed at an edge portion around the panel in order to reduce the weight and to secure strength.

As a method other than the reinforcing rib method, for example, in a glass fiber reinforced cement (hereinafter referred to as GRC) plate, a flexible anchor portion 22 welded to a lightweight steel frame 20 is fiber reinforced as shown in FIG. It is also well known that the steel stud construction panel is formed and fixed to the panel 1 by the bonding pad 23 made of cement mortar, and the lightweight steel frame is arranged at the peripheral edge of the panel to integrate the GRC and the frame made of the lightweight steel frame. .

In Japanese Utility Model Laid-Open No. 63-59921, an insert nut is embedded in the panel instead of the flexible anchor in the steel stud construction method described above, and a bolt is screwed into the insert nut to reinforce the panel. An outer wall panel is disclosed in which a mold material is fixedly attached, and a metal fitting for a frame is attached to the reinforcing mold material.

[0005]

[Problems to be solved by the device]

In the rib-reinforced panel, since the reinforcing rib portion is formed to a certain size due to the requirement of strength to withstand wind pressure load, etc., the difference in cross-sectional dimension between the rib portion and the thin-walled panel portion is large, and the stress generated in the thin-walled panel portion is Restrain the ribs at the periphery. Also, GRC has a large amount of cement in the mortar mixture, and as an example of the mixture, the long-term dry shrinkage rate is large at 10 to 15 × 10 ^-4, and cracks easily occur in the thin wall portion constrained by the rib portion There is a problem that it is difficult to reduce the weight of the panel because the rib portion is formed to a certain thickness from the load.

In the steel stud construction method, since the number of flexible anchors 22 is large, it takes a long time for the molding and fixing, and the strength of the bonding pad 23 is greatly influenced by the molding skill because the pad is formed by lamination molding. There were drawbacks such as

In the case of the outer wall panel of Japanese Utility Model No. 63-59921, when the tightening force of the bolt is large like the rib system, the edge of the cement panel is fixed with a lightweight steel frame so that the cement panel will not shrink due to drying. There is no escape to absorb and there is a drawback that cracks are generated in the thin part, and if the tightening force of the bolt that is screwed into the insert nut is greatly increased, the pulling load acts and cracks occur in the pulling direction, while tightening If the force is reduced, there is a problem that the cement panel will be displaced after it is attached to the building frame.

[0008]

[Means for solving problems]

 The present invention has been made in view of the above problems, and is intended for a panel which is lightweight, has sufficient strength, and is free from cracks, and is applied to the peripheral edge portion and / or the central portion of a fiber-reinforced cement panel. In a lightweight steel frame reinforcing panel in which a lightweight steel frame is screwed to a plurality of embedded insert nuts via bolts, at least two bolt holes that are bored on one side in the lateral direction of the lightweight steel frame have the same diameter as the bolt. The bolt is welded to the lightweight steel frame by sliding or loosening, and the other bolt hole is bored so that it can be loosely fitted to the bolt, and screwed into the insert nut via a spring washer. Provide a lightweight steel-framed reinforced panel with tightening torque of mating bolts of 300 Kg-cm or less.

The lower limit of the tightening torque is 100 kg-cm, preferably 150-250 kg-cm, and the material of the fiber reinforced panel is GRC, steel fiber reinforced cement (SFRC), carbon fiber reinforced cement (CFRC). , Aramid fiber-reinforced cement (ArFRC), etc., but the present invention is not limited to such reinforcing materials.

[0010]

[Action]

 In a structure in which a lightweight steel frame is screwed to a panel, bolts that are tightly inserted into two bolt holes that are bored in the lateral direction of the frame, or the bolt and the lightweight steel frame are welded together to form a panel. Both the lightweight steel frame and the cement panel are fixed by fixing the lightweight steel frame and preventing misalignment, and screwing other bolt holes looser than the bolt diameter with a torque that regulates the bolts via spring washers. It becomes slidable during the period, preventing cracks in the thin part due to shrinkage due to long-term drying of the cement panel and excessive pulling load.

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a back view showing a lightweight steel frame reinforcing panel of the present invention, a part of which is omitted, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. 1 is a sectional view taken along line CC of FIG. 1, FIG. 5 is an exploded perspective view taken along line DD of FIG. 1, and FIG. 6 is a partially cutaway perspective view showing an embodiment of a conventional steel stud construction method.

The lightweight steel frame reinforcing panel 11 has a thin portion 2 formed of fiber reinforced cement, a rib portion 3 in which an insert nut 4 is embedded after the thin portion is formed, and a rib portion around the outer periphery of the thin portion 2 is raised by 10 to 15 cm. A lightweight steel, for example, a C-shaped channel, is welded to the panel 1 consisting of a rising portion 5 provided for waterproofing between another light-weight steel frame reinforcing panel 11 adjacent in shape and the four corners or The fitting 8 is welded to a predetermined position, and the bolt 9 is inserted into the bolt holes 7, 7 ... Drilled according to the arrangement pitch of the insert nut 4 through the spring washer 10 to insert the insert. A light steel frame 6 is screwed onto the nut 4.

The two bolt holes 7 ′ and 7 ′ which are provided on one side of the lightweight steel frame 6 in the lateral direction are provided with bolts 9 that are inserted into the bolt holes 7 ′ and 7 ′ and tightened. The parts are welded to the lightweight steel frame 6 and fixed for positioning, while the other bolt holes 7, 7 ... Have a hole diameter larger than the outer diameter of the bolt 9 by at least 2 mm or more, and the bolt is inserted through the spring washer 10. 9 is tightened with a torque in the range of 100 to 300 kg-cm, the lightweight steel frame 6 is fixed on the back surface of the panel 1, and the lightweight steel frame reinforcement panel 11 in which the panel 1 and the lightweight steel frame 6 are integrated is not shown. Although it is fixed to the frame of the vehicle through a mounting metal fitting 8, a fastener (not shown) which is used for a curtain wall and follows the interlayer displacement between floors which occurs during an earthquake is mounted between the frame and the mounting metal 8.

The thickness of the panel 1 made of fiber reinforced cement is thinner than that of the precast concrete for a carton wall of 150 to 200 mm. Normally, the thickness of 70 mm or less is used, and the thickness of the thin portion 2 is preferable. The panel cross-sectional dimension of 10 to 20 mm is adopted, while the number and shape of the insert nuts 4 to be embedded in the panel 1 and their embedded depth are determined by the design load. When the embedded depth of the insert nut 4 is required from the viewpoint of safety of design load, the panel 1 is provided with the rib portion 3 and the insert nut 4 is embedded in the rib portion. The thickness of the rib portion 3 is Considering the pull-out resistance of the insert nut 4, the depth of embedding of the nut is preferably 30 mm or more, and therefore the thickness of the rib portion 3 is preferably 50 mm or more, while increasing the thickness of the rib portion 3 increases the weight of the panel 1. In order to reduce the weight, it is preferably 150 mm or less.

The arrangement pitch of the bolt holes 7 ′ and the insert nuts 4 corresponding to the holes is different depending on the type of cement, the aggregate, etc., but it is desirable to keep it to 1.5 m or less due to the contraction of the panel 1. 'And the bolt 9 to be inserted into the hole are fitted by sliding, it is not necessary to weld the head portion of the bolt and the lightweight steel frame 6 to each other.

The lightweight steel frame 6 is assembled from commercially available long lightweight steel (C type, L type, mouth type) and is not particularly limited to the embodiment, and the shape of the lightweight steel frame is not limited. Then, a lightweight steel frame is appropriately welded to the frame to reinforce it, and a diagonal member is appropriately attached to prevent distortion and twist of the shape.

The lightweight steel frame 6 is attached to the molded fiber-reinforced cement panel 1 instead of the above-described retrofitting method, and when the panel 1 is molded, the insert nut 4 is previously attached to the lightweight steel frame 6 via the bolt 9 to reduce the weight. In the simultaneous driving method in which the steel frame is set on the molding frame and the cement matrix containing the fibers is poured into the frame, as shown in FIG. 5, a commercially available film 12 made of vinyl chloride or fluorocarbon resin is placed in the lightweight steel frame 6 in advance. Adhesion is prevented by adhering cement, and in addition to loosening of the bolt 9 and the bolt hole 7, the joint surface between the panel 1 and the lightweight steel frame 6 is separated from each other so that the panel 1 can be contracted and slid by drying.

The operation of the present invention will be described below. The panel 1 made of fiber reinforced cement is provided with a rising portion 5 and a rib portion 3 for embedding the insert nut 4 in the periphery. The panel portion 1 is provided with a thin portion 2 to reduce the weight. The light steel frame 6 assembled in advance with the bolts 4 is joined and screwed to reinforce the bolts. The bolt holes 7'drilled in the light-weight steel frame 6 to be screwed have a hole diameter that allows the bolts 9 to slide and a spring. The lightweight steel frame is positioned and fixed integrally on the back surface of the panel 1 by tightly connecting the bolts 9 through the washer 10 or by tightening and then welding the heads of the bolts to the lightweight steel frame 6, while the lightweight steel frame 6 is integrated. Excessive pulling out by loosening the other bolt holes 7, 7 ... to be drilled on the bolt 9 and tightening the bolt 9 with a torque of 300 Kg-cm or less through the spring washer 10. The load is limited, and the loose clearance between the bolt 9 and the bolt hole 7 absorbs a slight slide of the bolt 9 due to the contraction of the panel 1 to prevent a crack from occurring in the panel 1.

[0019]

[Effect of the device]

 The present invention is designed so that a lightweight steel frame receives a load such as a wind pressure load to ensure strength, is lighter than an ordinary rib type panel, and has a fiber reinforced cement panel attached to the lightweight steel frame. Sliding at the mounting part, and by limiting the withdrawal load, prevent shrinkage due to panel drying and cracks due to excessive load, and the effect is remarkable.

[Brief description of drawings]

FIG. 1 is a rear view showing a lightweight steel frame reinforcing panel of the present invention, a part of which is omitted.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional view taken along the line CC of FIG.

5 is an exploded perspective view taken along the line D-D of FIG.

FIG. 6 is a partially cutaway perspective view showing an example of a conventional steel stud construction method.

[Explanation of symbols]

1 ... Panel 4 ... Insert nut 6 ...
・ Lightweight steel frame 7, 7 '・ ・ Bolt hole 9 ・ ・ Bolt 11 ・ ・ Lightweight steel frame reinforcement panel

Claims (1)

[Claims for utility model registration] [Claim 1] A lightweight steel frame reinforcement in which a lightweight steel frame is screwed through bolts to a plurality of insert nuts embedded in the peripheral edge portion and / or the central portion of a fiber-reinforced cement panel In the panel, at least two bolt holes formed on one side in the lateral direction of the lightweight steel frame are slid or loosely engaged with the bolt to weld the bolt to the lightweight steel frame. The diameter of the bolt hole is bored so that it can be loosely fitted to the bolt, and the tightening torque of the bolt that is screwed into the insert nut via the spring washer is 30.
A lightweight steel frame reinforcement panel with a weight of 0 kg-cm or less.