JP2000248657A - Hot melt rivet fastening member and fastening method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent suppress of expansion of a rivet when used, and to form a fireproof heat insulating layer by arranging an annular member which is melted by heating at the periphery of a neck lower portion of a rivet which is penetrated through and fastened to a fireproof expandable material which is expanded by heating to exhibit heat insulating performance. SOLUTION: The melting point of an annular member is set to 300 deg.C or less, and the annular member is inserted between a rivet head and a fireproof expandable material. When the expandable material is fastened, the rivet is inserted into the annular member and is penetrated through the expandable material. Then, a rivet neck lower portion protruded from the lower portion of the expandable material is flattened out and fixed, and the spacer-like annular member is arranged between the rivet head and the expandable material. In this case, the rivet head is threaded and fixed into the rivet neck lower portion which has absorbed expansion of the expandable material in the width direction and has penetrated through the expandable material. The rivet is generally made of iron, and the annular member is made of aluminum. The surface of the iron rivet is coated with a resin layer. Thus, even if the rivet is used in fastening the expandable material, sufficient fireproof heat insulating layer can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-fusible rivet fastening member disposed around a rivet for fastening a fire resistant expansion material and a fastening method using the same.

[0002]

2. Description of the Related Art In recent years, lightweight steel frames have been used as beams, columns, etc., which are structural materials of buildings in apartment houses and detached houses. Steel frames used as structural materials for such buildings include Ministry of Construction Notification No. 2999 and J.
A fire resistance performance standard is defined by IS A 1304, and a method of coating the surface of a steel frame with a material having excellent fire resistance (fire-resistant coating material) is generally implemented in order to satisfy the standard.

[0003] As a coating material for imparting fire resistance to steel frames, Japanese Patent Application Laid-Open No. Hei 6-32664 discloses a material in which inorganic components such as vermiculite and rock wool are mixed with water glass or hydraulic cement. . However, since this coating material needs to be applied or sprayed on the steel frame at the time of construction, there is a problem that the workability is poor. Further, the thickness of the formed refractory coating layer was likely to be uneven, and when the thickness was uneven, sufficient fire resistance could not be exhibited. In addition, cracks may occur in the formed fireproof coating layer, and the fireproof performance may be reduced. Furthermore, when sprayed by a wet or semi-dry method, it takes a long time to cure, so that the working efficiency is poor.

[0004] In addition, in order to impart fire resistance to steel frames, a heat-expandable fire-resistant sheet comprising a resin composition containing a resin component, a phosphorus compound, heat-expandable graphite and an inorganic filler has been proposed. The fire-resistant sheet is provided around a steel frame or the like, and expands by heating to form a fire-resistant heat-insulating layer composed of combustion residues, thereby exhibiting fire-resistant performance. The refractory sheet is usually used as a refractory laminate having a metal plate, an inorganic board, or the like laminated on the surface thereof in order to improve handleability, workability, and the like.

[0005] However, rivets are generally used for fastening the above-mentioned fire-resistant laminates. However, when the fire-resistant laminate expands due to heating, as shown in FIG. 3, the fire-resistant laminate is close to the blind rivet. Since the expansion is suppressed and the fireproof heat insulating layer is not sufficiently formed, there is a problem that fireproof performance is reduced.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to suppress the expansion by heating even when using a rivet when fastening a refractory laminate which expands by heating to form a refractory heat insulating layer. Another object of the present invention is to provide a heat-meltable rivet fastening member that exhibits excellent fire resistance performance because a fire-resistant heat-insulating layer is sufficiently formed, and a fastening method using the same.

[0007]

SUMMARY OF THE INVENTION A heat-fusible rivet fastening member according to the present invention melts by heating around a lower part of a neck of a rivet which is fastened through a refractory expansion material which expands by heating to exhibit heat insulating performance. The ring member is provided.

As the annular member used in the present invention, for example, as shown in FIG. 1A, a cylindrical member having a flange on an upper portion is used. When fastening the refractory inflatable material, the refractory inflatable material is penetrated in a state in which the lower part of the rivet neck is inserted into an annular member made of a cylindrical heat-fusible material,
The lower neck protruding downward from the refractory material is fixed by crushing. When the lower part of the neck is crushed, the upper part is deformed to form a flange, and an annular member having the shape shown in FIG. 1A is completed.

The above-mentioned annular member melts and disappears when heated at a temperature higher than the melting point, and as shown in FIG. 1 (b), between the rivet head and the refractory expansion material, around the lower part of the rivet neck. Since the expansion allowance is formed, the dimensional changes in the thickness, width and length directions when the refractory expansion material expands by heating can be absorbed.

Therefore, the dimensions of the fastening component are appropriately determined by the expansion allowance of the refractory expansion material. Further, it is preferable that the rivet head is provided so as to be wider than the fastening part, and the rivet neck lower part has a length that protrudes from below the refractory expansion material.

FIG. 2A shows an example of the annular member.
As shown in the above, the spacer may be inserted between the rivet head and the refractory expansion material. When fastening the refractory inflatable material, a rivet is inserted through the annular member to penetrate the refractory inflatable material, and the lower part of the rivet neck protruding from below the refractory inflatable material is fixed by crushing. With such a method, the spacer-like annular member can be disposed between the rivet head and the fire resistant expansion material.

The above-mentioned annular member is heated and melted by heating at a temperature not lower than the melting point, and can absorb the expansion in the thickness direction of the refractory expansion material as shown in FIG. Therefore, the thickness of the annular member is appropriately determined by the expansion allowance of the fire resistant expansion material.

[0013] The rivet head and the lower part of the rivet neck are:
A structure (not shown) for screwing with a screw may be adopted. With such a screwing structure, the rivet head can be fixed to the lower part of the rivet neck through the fire-resistant expansion material by screwing the rivet head, so that a rivet in which the tip of the lower part of the rivet neck is crushed from the beginning can be used. Become. Further, the expansion allowance in the thickness direction of the refractory expansion material can be adjusted by the screwing structure.

The rivet has a melting point of 100 for refractory applications.
Those having a temperature of 0 ° C. or higher are preferable, and are generally made of iron (melting point 1535).
° C). The annular member is made of aluminum (melting point: 660 ° C.). However,
The melting point of the annular member is preferably 300 ° C. or less. For example, a material in which a resin layer is coated on the surface of an iron rivet is used.

The refractory intumescent material used in the present invention is not particularly limited as long as it expands by heating to form a refractory heat-insulating layer of combustion residues and exhibits refractory performance. A fire-resistant expandable resin sheet filled with a heat-expandable material such as vermiculite, borax, a foaming agent, and the like can be given. Flame shields may be laminated on both sides of the resin sheet.

The fire-resistant expansive resin sheet is 50 kW.
The expansion ratio when the volume is expanded for 30 minutes under heating conditions of / cm ² is preferably 2 to 20 times, and the thickness thereof is preferably 0.3 to 5 mm. When the thickness is less than 0.3 mm, sufficient heat insulating properties cannot be exhibited even when expanded, and when the thickness exceeds 5 mm, it becomes heavy and handling becomes difficult.

The above-mentioned fire-resistant expansion resin sheet is preferably made of a resin composition containing a thermoplastic resin and / or a rubber substance, a phosphorus compound and an inorganic filler. The resin composition exhibits sufficient heat insulating properties due to thermal expansion, can be formed into a sheet, and has excellent handleability. Although it does not specifically limit as said inorganic filler, It is preferable to use hydrates, such as aluminum hydroxide, and metal carbonates, such as calcium carbonate.

The fire-resistant expansive resin sheet includes:
In addition to the thermoplastic resin and / or the rubber substance, the phosphorus compound, and the inorganic filler, neutralized heat-expandable graphite, polyhydric alcohol, and the like may be added.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

(Example 1) 40 parts by weight of butyl rubber ("# 052" manufactured by Exxon Chemical Co., Ltd.), 50 parts by weight of polybutene ("100R" manufactured by Idemitsu Petrochemical Co., Ltd.), hydrogenated petroleum resin ("Escolets 5320" manufactured by Tonex Corporation) ) 10 parts by weight of neutralized heat-expandable graphite (“GR
EP-EG "), 30 parts by weight, 100 parts by weight of ammonium polyphosphate (" Terage C80 ", manufactured by Chisso), 50 parts by weight of aluminum hydroxide (" H-31 ", manufactured by Showa Denko KK), and calcium carbonate (Bikita powder) 100 parts by weight of "Katon Corp." Whiteton BF-300 ") were supplied to two kneading rolls and kneaded to obtain a fire-resistant expansible resin sheet.

An iron plate was laminated on one side of the fire-resistant expansive resin sheet, and a galvanized steel sheet was laminated on the other side, to produce a fire-expandable material having face materials on both sides of the fire-expandable resin sheet. When fastening the refractory expansion material, a cylindrical aluminum heat-fusible annular member shown in FIG. 1A is inserted in the thickness direction thereof, and then the lower part of the rivet neck is inserted into the hollow portion of the fastening component. Then, the lower part of the rivet neck protruding from the fire-resistant expansion material was crushed and fixed to obtain a sample for a fire resistance test. At this time, a flange was formed in which the upper end of the fastening component was bent. Then, the sample for fire resistance test was 800
When heated at 30 ° C. for 30 minutes, the fastening parts are melted and disappear by heat, and the refractory expansion material expands in the direction of the expansion allowance shown in FIG. 1 (b) to form a sufficient refractory heat insulating layer. Was.

(Example 2) A thick plate-like aluminum heat-meltable annular member shown in FIG. 1A was inserted into the lower part of the rivet neck of the fire-resistant expansion material produced in the same manner as in Example 1. The lower part of the rivet neck protruding from the refractory expansion material was crushed and fixed to obtain a sample for a refractory test. When this fire resistance test sample was heated under the same conditions as in Example 1, the fasteners were melted and disappeared by heat, and the fire resistant expansion material was oriented in the thickness direction as shown in FIG. It expanded and a sufficient refractory and heat insulating layer was formed.

(Comparative Example 1) A fire-resistant expansive material produced in the same manner as in Example 1 was fastened with a blind rivet according to a conventional method to obtain a fire-resistant test sample. When this fire resistance test sample was heated under the same conditions as in Example 1, the fasteners were melted and disappeared by heat, and the fire resistant expansion material expanded in the thickness direction as shown in FIG. In addition, expansion near the blind rivet was suppressed, and a sufficient refractory heat insulating layer was not formed.

[0024]

The hot-melt rivet fastening member and the fastening method according to the present invention have the above-mentioned structure, and can be used even when a rivet is used when fastening a fire-resistant expanded material that expands by heating to form a fire-resistant heat-insulating layer. In addition, a sufficient refractory heat-insulating layer is formed without suppressing expansion due to heating.

[Brief description of the drawings]

FIG. 1A is a schematic sectional view showing one embodiment of an annular member, and FIG. 1B is a schematic sectional view showing an expansion allowance after the annular member is melted by heat.

FIG. 2 (a) is a schematic sectional view showing another embodiment of the annular member, and FIG. 2 (b) shows a state in which the refractory heat insulating layer has expanded after the annular member has disappeared due to thermal melting. It is a schematic cross section.

FIG. 3 is a schematic sectional view showing a conventional rivet fastening method.

Claims (3)

[Claims] An annular member which is melted by heating is provided around a lower part of a neck of a rivet which is fastened through a refractory expansion material which expands by heating to exhibit heat insulation performance. Soluble rivet fastening member. 2. The heat-fusible rivet fastening member according to claim 1, wherein the melting point of the annular member is 300 ° C. or less. 3. The heat-meltable rivet fastening member according to claim 1 or 2, when fastening a refractory inflatable material which expands by heating to exhibit heat insulation performance by means of a rivet penetrating the refractory inflatable material. A fastening method characterized by the above-mentioned.