JPH10266398A - Execution method of lightweight mortar-based cold resistant and fire resistant covering material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a crack in a covering material painting part at the time of execution of covering material by providing a cutting joint part on a lightweight mortar-based cold resistant and fire resistant covering material painting part executed on whole circumference of a column, a beam and the like at prescribed intervals. SOLUTION: Cutting joint parts 1 of 5-30 mm wide are provided on a lightweight mortar-based cold resistant and fire resistant covering material painting part executed on the whole circumference of the column 2 and the beam 3 of an outdoor building at prescribed intervals. The cutting joint part 1 is provided over the whole thickness (25-40 mm) of covering material, ceramic fiber is inserted as fire resistant joint material, and the surface is waterproof- processed by silicon, charcoal or urethane-based caulking material. Generally speaking, a crack occurs on the surface of the covering material due to expansion and contraction of a steel frame by dry contraction of the covering material after execution, change of outside temperature, vibration or the like, and the occurrence of the crack can be prevented one year or longer after execution by providing the cutting joint part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying a lightweight mortar-based refractory and fire-resistant coating material, and more particularly to an improvement in an application method capable of preventing occurrence of cracks in a coating material application portion after application.

[0002]

2. Description of the Related Art Petroleum refining, petrochemical plants, LPG /
Lightweight mortar-based cold-resistant fire-resistant coating materials are used in the past for cold-resistant fire-resistant coating of columns and beams such as equipment support bases of LNG plants and general chemical plants, and fire-resistant coatings of columns and beams on exposed outdoor parts of high-rise buildings. The construction method of applying to the entire circumference of columns and beams is adopted. As the covering material, a vermiculite-based in-situ coating type, for example, a product called Mand Seal (trade name) is used. It mainly comprises specially processed calcined vermiculite grains and Portland cement, and special fillers and additives are added to improve fire resistance and workability.

The standard constituent materials and weight percentages are as follows. Standard constituent materials wt% Vermiculite (foamed vermiculite) ... 20 Cement ... 43 Calcium carbonate ... 30 Refractory admixture and thickener ... 7

The main chemical components and weight percentages are as follows. The main chemical components _{wt% SiO 2 ... 16~20 CaO ... 27~30} Al 2 O 3 ... 4~6 MgO ... 5~7 CaCO 3 ... 30~32

The above-mentioned materials are asbestos-free and have the following excellent features. (A) It does not burn because it uses a completely inorganic material. Therefore, there is no generation of smoke, toxic gas or odor that hinders fire fighting in the event of a fire. (B) It adheres well to most substrates, such as iron, concrete, and bricks, and does not peel off in the event of a fire. (C) Insensitive to temperature changes and weather.

FIG. 3 shows an example in which the coating material 12 is applied to the steel column 11 by trowel coating. Reference numeral 13 denotes a bronch anchor (adhesive), and reference numeral 14 denotes an expanded metal (reinforcing wire mesh).

[0007]

The above-mentioned covering material has the above-mentioned excellent characteristics. However, after the application to columns and beams, the drying and shrinkage of the covering material, changes in the outside air temperature,
Cracks occur on the surface of the coating material application portion due to displacement of the steel frame due to vibration or the like. When cracks occur, not only the appearance deteriorates, but also some of them become so large that performance becomes a problem. In addition, since cracks occur several months after construction, scaffolding and the like must be erected when repairing the cracks, requiring high cost and considerable time and date.

An object of the present invention is to provide an improved construction method for preventing the occurrence of cracks after construction of the lightweight mortar-based refractory and fire-resistant coating material in order to solve such problems.

[0009]

Means for Solving the Problems In order to achieve the above object, the invention of claim 1 relates to a construction method for applying a lightweight mortar-based cold and fire-resistant coating material to columns and beams, etc., of an outdoor exposed part of a building. The gist of the present invention is to provide cut joints at predetermined intervals in the coating material application section on the entire circumference of the column or the beam at the time or after construction.

[0010] The invention of claim 2 is the gist of the invention of claim 1, wherein a fireproof joint material is inserted into the cut joint portion, and the surface is waterproofed.

[0011] The invention of claim 3 is the gist of the invention of claim 1 or 2, wherein the width of the cut joint portion is 5 to 30 mm.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a lightweight mortar-based cold and fire-resistant coating material such as the above-mentioned mand seal is applied to the entire periphery of pillars or beams of an outdoor building.
Alternatively, after the construction, cut joint portions are provided at appropriate intervals (approximately 3 to 6 m pitch) in the coating material application portion on the entire circumference of the column or beam. A fire-resistant joint such as a ceramic fiber is inserted into the joint, and the surface is waterproofed with a caulking material. The width of the joint is about 5 to 30 mm. By providing the cut joints at appropriate intervals in this manner, the occurrence of the crack can be prevented.

[0013]

Embodiments of the present invention will be described below. FIG. 1 shows an embodiment of the construction method according to the present invention, wherein reference numeral 1 denotes a cut joint provided on a coating material application portion on the entire periphery of a pillar 2 and a beam 3 of an outdoor building. The width t of the cut ground is about 5 to 30 mm.
The configuration of the cut portion is, for example, as shown in FIGS. 2 (a) and 2 (b).

The cut joint shown in FIG. 2 (a) is provided over the entire thickness (25 to 40 mm) of the coating material 4 applied to the steel frame 5, and a ceramic fiber is inserted as a fire-resistant joint material 6, and the surface thereof is provided. Is waterproofed with a silicone, thiochol or urethane caulking material. Reference numeral 7 denotes a reinforcing wire mesh. FIG. 2B is an example in which the length of the cut is set to の of the thickness of the covering material 4. The construction of the cut area is after application (after drying) even when applying the coating material
Either may be used. The covering material is not limited to the mand seal. The results of the fire resistance test and the cold resistance test at the cut joint are shown below.

1. Fire resistance test (1) Test conditions (JIS 1304) Heating device: Vertical electric furnace Heating condition: Program operation by fire resistance test temperature curve (1
Time fireproof) Mand seal: 25 mmt Curing: 28 days after construction (2) Specimen Specimen A: No cut area Specimen B: Notched area (approximately 20 mmt) (3) Test result Specimen B was used in the fire resistance test of JIS 1304. passed it.

2. Cold resistance test (1) Test method Put LN2 (-190 ° C) in a test container, and immerse the test specimen in this for 1 hour. Take out the specimen and check if the mand seal has fallen off. Mand seal: 25mmt Curing: 28 days after construction (2) Specimen Specimen A: No cut area Specimen B: Cut area (about 20mmt) (3) Test result Specimen A, Specimen B, all dropped None Cracks occurred in test sample A, and no cracks were observed in B.

[0017]

As described above, according to the present invention, cracks can be prevented from being formed on the surface of the coating material one year after the coating material is formed by providing the cut joint portion at the time of or after the application of the coating material. And the practical effect is enormous.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a construction state according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of a cut joint portion;

FIG. 3 is a view showing an example of a conventional mand seal installation state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cut joint part 2 Column 3 Beam 4 Covering material 5 Steel frame 6 Fireproof joint member 7 Reinforcing wire mesh 8 Caulking material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C04B 103: 44 111: 28 111: 76

Claims (3)

[Claims] 1. A construction method of applying a lightweight mortar-based refractory and fire-resistant coating material to columns, beams, and the like of exposed outdoor portions of a building,
A method for constructing a lightweight mortar-based cold and fire-resistant coating material, wherein cut joints are provided at predetermined intervals in a coating material application portion on the entire periphery of the column or the beam during or after the application. 2. The method according to claim 1, wherein a refractory joint is inserted into the joint and the surface is waterproofed. 3. The method for applying a lightweight mortar-based cold and fire resistant covering material according to claim 1, wherein the width of the cut joint portion is 5 to 30 mm.