JP2820661B2 - Fire-resistant coating material for steel frame and fire-resistant coating structure of steel frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant covering material for protecting a structural steel frame of a building from a flame in a fire and a fire-resistant covering structure thereof.

[0002]

2. Description of the Related Art Hitherto, in order to protect a structural steel frame of a building from a fire in a fire, a steel frame has been coated with a fire-resistant coating material made of a ceramic fiber blanket. For example, by applying a refractory coating made of a ceramic fiber blanket to a steel frame and fixing the refractory coating with a metal pin previously welded to the steel frame, or inserting the metal pin into the refractory coating and welding with a welding gun later. Fireproof coating is installed.

However, the conventional refractory coating is made of a ceramic fiber blanket in which ceramic fibers are formed in a felt shape by mutual entanglement and frictional force. There is a drawback that the heat insulating property is deteriorated because the film is stretched and becomes thin.

[0004] In addition, in order to suppress sagging or bending of the fire-resistant coating material during coating, a fire-resistant coating material in which a turtle net is arranged on the surface or inside of a ceramic fiber blanket and sewn and fixed with wire is also used. But,
Since the turtle wire mesh expands and contracts in the same way as a blanket, it was inevitable that it would expand and become thinner when it was pulled and constructed.

[0005] In order to prevent a decrease in heat insulation due to elongation at the time of application of the refractory coating material, a method of dispersing an organic or inorganic binder in ceramic fibers and heat-treating the ceramic fibers to each other, In some cases, the blanket has been partially overlapped and attached in anticipation of growth.

However, in the method using an organic binder, the organic binder burns inside the blanket during a fire,
It causes the temperature of the steel frame to rise. In addition, the method using an inorganic binder is not preferable in handling at the time of coating since the flexibility of the blanket is impaired. Furthermore,
The method of overlapping and constructing has a problem that the amount of blanket used increases due to the overlap.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention improves the dimensional stability without impairing the flexibility of the ceramic fiber blanket, and increases the thickness even when the steel fiber is stretched at the time of coating. To provide a fire-resistant coating material for a steel frame that can protect a structural steel frame by exhibiting a desired heat insulating property in the event of a fire, and a fire-resistant coating structure for a steel frame using the fire-resistant coating material. The purpose is to do.

[0008]

In order to achieve the above-mentioned object, the present invention provides a refractory coating material for a steel frame comprising a ceramic fiber blanket and a non-woven fabric comprising a heat-fusible fiber superposed on the surface of the ceramic fiber blanket. Wherein the nonwoven fabric is partially stabbed into the blanket and is integrated by heat fusion with the blanket.

Further, another refractory coating material for steel frames according to the present invention includes a ceramic fiber blanket, a nonwoven fabric,
The ceramic fiber blanket and a welded wire mesh inserted between the nonwoven fabrics, wherein the nonwoven fabric is partially pierced into the ceramic fiber blanket through the mesh of the welded wire mesh, or the ceramic fiber blanket and the nonwoven fabric are passed through the mesh of the welded wire mesh. Are sewn and integrated.

Further, the fire-resistant coating structure for a steel frame according to the present invention uses a fire-resistant coating material for a steel frame comprising the above-mentioned ceramic fiber blanket and non-woven fabric and, if desired, a welded wire mesh sandwiched between the two. The ceramic fiber blanket side is attached to the structural steel frame of the building, and is fixed to the steel frame with a metal pin.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The refractory coating material for steel frames of the present invention comprises a nonwoven fabric or a welded wire mesh and a nonwoven fabric laminated on the surface of a ceramic fiber blanket conventionally used as a refractory coating material, and these are integrated. The dimensional stability of the nonwoven fabric or the welded metal mesh suppresses the overall elongation and prevents the thickness from being reduced during coating.

For example, the refractory coating shown in FIG. 1 comprises a ceramic fiber blanket 1 and a non-woven fabric 2 superposed on the surface of the ceramic fiber blanket 1, and this non-woven fabric 2 contains heat-fusible fibers. . The nonwoven fabric 2 is partially stabbed into the ceramic fiber blanket 1 by a needle treatment, and the heat-fusible fibers of the nonwoven fabric 2 are thermally fused with the ceramic fiber blanket 1 by heat treatment to be integrated. I have.

It is also possible to insert a wire mesh such as a turtle net or a welded wire between the ceramic fiber blanket 1 and the non-woven fabric 2 so as to be sandwiched. In particular, the turtle shell wire mesh has the disadvantage of lacking dimensional stability because it expands and contracts due to external force.However, since this fireproof covering material has a nonwoven fabric integrated by heat fusion as described above, it has a sufficient size even if the turtle shell wire mesh is inserted. It has stability.

In the case of this fire-resistant covering material, the nonwoven fabric 2 contains heat-fusible fibers, so that the nonwoven fabric 2 is heat-treated as described above.
Is thermally fused to the ceramic fiber blanket 1 and the fibers of the nonwoven fabric 2 are also thermally fused to each other. For this reason, even if it pulls at the time of coating | cover construction to a steel frame, it hardly expands, and the required thickness can be ensured.

In this case, the nonwoven fabric 2 may be composed of only the heat-fusible fibers, or may be a mixture of the heat-fusible fibers and other fibers. Examples of the heat-fusible fibers include polyester fibers, polyamide fibers, polyvinyl alcohol fibers, polyvinyl chloride fibers, vinylidene fibers, and acrylic fibers, among which polyester fibers are preferred in terms of quality and cost. . The content of the heat-fusible fiber in the nonwoven fabric is preferably as large as possible in order to ensure excellent dimensional stability due to heat fusion, but it is generally sufficient if the content is 50% or more.

The fibers other than the heat-fusible fibers contained in the nonwoven fabric are not particularly limited, but a self-extinguishing refractory coating material can be obtained by mixing flame-retardant fibers or non-flammable fibers. In this case, even if the fire-resistant coating material is ignited due to a fire problem at the time of coating, etc., the fire is naturally extinguished by the mixed flame-retardant or non-combustible fiber, thereby preventing a fire accident.

Another refractory coating according to the present invention comprises a ceramic fiber blanket 1, a nonwoven fabric 2, and a ceramic fiber blanket 1 as shown in FIG.
And a welded wire mesh 3 inserted between the nonwoven fabric 2. In this refractory coating material, the nonwoven fabric 2 is partially stabbed into the ceramic fiber blanket 1 through the mesh of the welding wire mesh 3 by needle treatment, or the nonwoven fabric 2 is passed through the mesh of the welding wire mesh 3.
By sewing the nonwoven fabric 2 with the nonwoven fabric 2, these are mechanically integrated.

Since the welded wire mesh 3 does not have elasticity unlike the turtle wire mesh, by integrating it with the ceramic fiber blanket 1 and the nonwoven fabric 2 as described above,
Excellent dimensional stability is obtained as a whole of the refractory coating material. Therefore, the nonwoven fabric 2 in this case is not particularly limited, and does not necessarily need to include heat-fusible fibers. However, it is also possible to include a heat-fusible fiber in the nonwoven fabric and to perform a heat treatment after the needle treatment. It is to be noted that a self-extinguishing refractory coating material can be obtained by including a flame-retardant or non-combustible fiber in a nonwoven fabric, as in the above case.

[0019] Regardless of whether the nonwoven fabric contains heat-fusible fibers or not, if it is less than 20 g / m ² , the strength is insufficient, and the dimensional stability of the refractory coating material is undesirably reduced. When the nonwoven fabric does not contain flame-retardant or non-combustible fibers, if the nonwoven fabric has a basis weight of more than 150 g / m ² and is burned by fire, the heat of combustion may affect the steel frame. Therefore, generally, 20 to 150 g / m
It is preferable to use about ^two nonwoven fabrics.

As described above, the refractory coating material for steel frames of the present invention has a dimensionally stable nonwoven fabric (heat-treated) or a welded wire mesh integrally provided with the ceramic fiber blanket, so that it is almost stretched even when pulled during coating. Therefore, it is possible to always secure the necessary thickness to protect the steel frame from flames in a fire. In addition, since the nonwoven fabric is disposed on the surface, dust generated from the ceramic fiber blanket during handling can be suppressed, and rainwater can be prevented from entering during outdoor work.

When the refractory coating material according to the present invention is applied to a steel frame, as shown in FIG. 3, the nonwoven fabric 2 is turned outside and the ceramic fiber blanket 1 is brought into contact with the structural steel frame 4 of the building, and the metal Steel 4 with pin 5
And fix it to The metal pin 5 may be fixed to the steel frame 4 by welding in advance, or the metal pin 5 may be inserted into a refractory coating material and welded to the steel frame 4 by a welding gun later. Reference numeral 6 in the drawing denotes a flange-shaped locking portion fixed to one end of the metal pin 5 in order to prevent the refractory coating material from coming off.

As described above, the nonwoven fabric 2 having a possibility of burning
Is placed on the front side, and the ceramic fiber blanket 1 having excellent fire resistance is arranged facing the steel frame 4 for construction. Therefore, even if the nonwoven fabric 2 is burned by a fire, it is cut off by the ceramic fiber blanket 1 together with the fire flame. You. In particular, when the nonwoven fabric 2 contains flame-retardant or non-combustible fibers, the nonwoven fabric 2 disposed on the front side exhibits self-extinguishing properties. Can be expected.

Further, when the refractory coating material includes a wire mesh,
Since the wire mesh prevents sagging and bending at the time of coating, the shape retention is excellent, and the coating is easy.
The wire mesh used should have a wire diameter in the range of 0.2 to 1.8 mm and an aperture of about 10 to 100 mm in consideration of the strength for maintaining the shape and the ease of bending during construction. Is preferred.

[0024]

EXAMPLE A 50% polyester fiber (product name: Melty) manufactured by Unitika Ltd. was used as a heat-fusible fiber.
Mix with 50% flame retardant fiber (trade name Trevira) made of
A nonwoven fabric (web) having a basis weight of 50 g / m ² was prepared by performing a needle treatment.

This non-woven fabric is prepared by adding a thickness of 30 mm and a width of 1200
mm, length 3000 mm, placed on the surface of a ceramic fiber blanket having a bulk density of 0.1 g / cm ³ , and subjected to needle treatment again to partially pierce and embed the fiber group of the nonwoven fabric into the inner layer of the ceramic fiber blanket. The polyester fibers were thermally fused by heat treatment at 85 to 120 ° C.

The obtained refractory coating material has a large peel strength between the nonwoven fabric and the ceramic fiber blanket, and can be used in ordinary handling operations such as cutting, transferring, boxing, and transporting.
It was able to withstand repetitive bending movements. Further, after the heat-fusible fiber was solidified by the heat treatment, the dimensional change did not occur even if the heat-fusible fiber was repeatedly heated in a temperature range equal to or lower than the heat treatment temperature, and a stable shape was maintained.

The nonwoven fabric of the refractory coating was applied outside, that is, the ceramic fiber blanket was applied to the structural steel frame. At that time, the refractory coating material did not stretch and did not become thin even when pulled or bent to conform to the shape of the steel frame. Thereafter, a metal pin having a flange-shaped locking portion was pierced through the refractory coating material, and fixed to the steel frame by welding with a welding gun.

When the flame of the burner was brought close to the refractory covering material attached to the steel frame in this way, the vicinity of the flame in the nonwoven fabric on the surface burned, but the flame was extinguished naturally without spreading. In addition, no increase in the temperature of the inner steel frame due to the flame and the combustion at this time was observed.

[0029]

According to the present invention, it is possible to work along a steel frame flexibly and easily, has excellent dimensional stability, does not become thin even when pulled during coating, and has excellent heat insulating properties. Can be provided. Also,
Fire-resistant coating material with wire mesh inside has excellent shape retention,
Sagging and bending during construction can be prevented.

The refractory coating material can be attached to the structural steel frame with a metal pin as usual and coated, and the thickness does not become thin at the time of construction, so that the structural steel frame is effectively protected from fire. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a specific example of a fire-resistant coating material of the present invention with a part cut away.

FIG. 2 is a partially cutaway perspective view showing another specific example of the refractory coating material of the present invention.

FIG. 3 is a sectional view showing a refractory coating structure of a steel frame according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceramic fiber blanket 2 Nonwoven fabric 3 Welded wire mesh 4 Steel frame 5 Metal pin 6 Locking part

Claims (5)

(57) [Claims] 1. A ceramic fiber blanket,
A nonwoven fabric containing heat-fusible fibers superimposed on the surface of a ceramic fiber blanket, wherein the nonwoven fabric is partially stabbed into the blanket and heat-fused to the blanket to be integrated. Refractory coating for steel frames. 2. The refractory coating material for steel frames according to claim 1, wherein a wire mesh is sandwiched between the ceramic fiber blanket and the nonwoven fabric. 3. A ceramic fiber blanket,
A non-woven fabric and a welding wire mesh inserted between the ceramic fiber blanket and the non-woven fabric, wherein the non-woven fabric is partially pierced into the ceramic fiber blanket through the mesh of the welding wire mesh, or the ceramic fiber is inserted through the mesh of the welding wire mesh. A fire-resistant coating material for steel frames, wherein a blanket and a nonwoven fabric are sewn and integrated. 4. The fire-resistant coating material for steel frames according to claim 1, wherein the non-woven fabric contains a flame-retardant fiber or a non-flammable fiber. 5. The refractory coating material for a steel frame according to claim 1 or 3, wherein the nonwoven fabric is placed outside and the ceramic fiber blanket is applied to the structural steel frame of the building, and is fixed to the steel frame with a metal pin. A fire-resistant coating structure made of steel.