JPH01307584A - Conjunction constitution of slab-through steel pipe - Google Patents

Abstract

PURPOSE:To improve the fire-resistance, the heat-insulation and the adiabatic characteristics by filling the clearance between the external face of a steel pipe through which the slab of a fire-prevention section passes and a slab- through hole with ceramic fiber and covering the opposing end faces of the filling layer with a plate made of an inorganic fire-resistance material. CONSTITUTION:A through-hole 7 is formed inside a fire-prevention wall 1 and a steel pipe 2 on which corrosion-preventing vinyl tape 3 is wound is inserted into said through-hole 7. A clearance is given between the internal face of the through-hole 7 and the external face of the steel pipe 2. The clearance is filled with ceramic fiber, such as rock wool 5 and the clearance at the end face of the rock wool 5 is filled with a ceramic fiber layer 8 and fire-resistance putty 9b. Inorganic fire-resistance plate 6 such as a calcium silicate heat insulating plate or a fire brick plate is fixed on the external end part. As a result, superior fire-resistance, heat-resistance and adiabatic characteristics may be provided.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a joint structure of steel pipes provided through a slab (floor, ceiling, or wall) forming a fireproof division, and in particular, the present invention relates to a joint structure of steel pipes provided through a slab (floor, ceiling, or wall) forming a fireproof division. The present invention relates to a joint structure that can exhibit excellent fire resistance, heat resistance, and heat insulation performance in the joint portions of the invention.

[Prior Art] When installing a slope drainage pipe or the like through a fire protection division, it is required to satisfy the following test standards (1) to (3) based on the Japan Building Center Disaster Prevention Performance Evaluation.

■No changes such as deformation, destruction, or falling off that are considered detrimental to fire resistance occur during heating.

■During heating, there will be no cracks or gaps in the penetrating part or filling part that would allow the flame to pass through.

■Do not ignite from the penetrating part or filling part during heating.

■During heating, the temperature of the filling part and tube on the opposite side of the slab is 260℃.
shall not exceed.

■There must be no flames or residual flames on the cable on the back side within 10 minutes after heating is completed.

FIG. 4 is an explanatory cross-sectional view showing a joint structure of the hard vinyl chloride-lined steel pipe 2 for water supply and drainage provided to penetrate the fire wall 1. A corrosion-preventing vinyl tape 3 is wrapped around the outer circumference of the steel pipe 2 (rust-preventing paint may be applied instead of the vinyl tape), and is formed between the inner circumferential surface of the through hole 7 and the outer circumferential surface of the steel pipe 2. A mortar cement 4 is filled into the penetration space. In this way, the penetration gap of the steel pipe 2 is completely sealed by the mortar cement 4, which plays the role of supporting and fixing the steel pipe 2 to the fire wall 1, and also prevents flames, high temperature air, etc. from the heating side H from entering into the room temperature side C. It also plays a role of blocking.

[Problems to be Solved by the Invention] When constructed with the above-mentioned joint structure, if the steel pipe 2 is less than 200A in diameter (nominal diameter: outer diameter is 216.31!1 m), all of the criteria from ■ to ■ above must be met. It was relatively easy to satisfy. However, when the diameter exceeds 200A, there is a problem in that it becomes very difficult to satisfy the criterion (2). That is, for example, if a fire resistance test is conducted for 2 hours, the temperature at the temperature measurement point Po on the end face of the filling part C on the room temperature side of the mortar cement 4 is 260°C.
It was found that the above bonded structure had a problem particularly in terms of heat insulation performance.

Therefore, the inventors of the present invention have developed a joint structure that can easily satisfy the criteria (■ to ■) above and exhibits excellent fire resistance, heat resistance, and heat insulation performance even when installing steel pipes with a diameter of 200A or more. For the purpose of development, various researches were conducted and the present invention was completed.

[Means for Solving the Problems] The present invention, which has achieved the above object, has ceramic fibers filled in the space formed between the outer circumferential surface of the steel pipe and the slab through-hole, and both end surfaces of the ceramic fiber filled layer covered with an inorganic refractory material. The gist of this is that it was sealed off with wooden boards.

[Operations and Examples] FIG. 1 is an explanatory cross-sectional view showing a typical example of the present invention, and FIG. 2 is an explanatory view taken in the direction of arrow II in FIG. 1.

A vinyl tape 3 for corrosion protection is wrapped around the outer peripheral surface of the steel pipe 2, and the steel pipe 2 is disposed through a through hole 7 of the fire wall 1. The gap formed between the inner circumferential surface of the through hole 7 and the outer circumferential surface of the steel pipe 2 is filled with ceramic fibers such as rock wool (JIS A9504) 5 of 150 to 200 kg.
The rock wool 5 is filled with a density of 113 g/l, and a heat insulating ceramic fiber layer 8 is formed on one end of the packed layer of rock wool 5, and a fireproof putty is formed on the heat insulating ceramic fiber layer 8 and one end of the rock wool 5. (Fineflex fiber cast: manufactured by Nichias) 9b 5
Fill to a thickness of ~20 mm. The heat insulating ceramic fiber layer 8 is preferably made of silica fiber, alumina fiber, or silicon carbide fiber. In the present invention, natural inorganic fibers such as rock wool and processed inorganic fibers such as silica fibers are referred to as ceramic fibers. The fireproof putty 9b is filled so as to be flush with both left and right wall surfaces of the fireproof wall 1, and inorganic refractory plates 6 are attached to the outside of the fireproof putty 9b. The inorganic refractory plate 6 is made of a fire-resistant material such as a calcium silicate plate or a fire-resistant brick plate, and is formed in a half-shape with a notch 10a in the center for passing the steel pipe 2 through, so that it does not come into contact with any of the fire walls 1. A fireproof adhesive is applied to the side of the fireproof wall, and it is attached to the four faces of the fireproof wall, and is fixed to an anchor bolt 10 protruding from the firewall 1. Then, fireproof putty 9a is applied to the gap between the notch 10a and the outer peripheral surface of the steel pipe 2, the protrusion of the anchor bolt, and the boundary between the firewall 4 and the refractory board 6 to seal it. Perform the following treatment.

The steel pipe joint structure described above exhibits excellent effects in all aspects of fire resistance, heat resistance, and heat insulation performance, and can satisfy all of the criteria (1) to (4) above. It has been found that by setting the thickness of the inorganic refractory plate 6 to 20 mm or more, more excellent effects in the above-mentioned heat insulation performance etc. can be exhibited.

In the conventional example shown in FIG. 3(a) and the embodiment of the present invention shown in FIG. 3(b), the heating side H was made to reach 1010°C in 2 hours according to the standard heating curve specified in JISA1304, and the room temperature side C was heated to 1010°C in 2 hours. Temperature changes at measuring points P, , P, were measured. The fire wall 1 uses a prestressed concrete board with a thickness of 100! A calcium silicate plate with a thickness of 22 mm was used.

As a result of this experiment, the maximum temperature at measurement point P in the conventional example was 2
The temperature reached 97°C, whereas the highest temperature at measurement point p's in the present invention was 109°C, indicating that the example of the present invention had excellent heat insulation performance and could easily satisfy the criterion (2) above. .

In the present invention, the steel pipe disposed through the slab is not limited to the above-mentioned hard vinyl chloride lined steel pipe, but can also be applied to carbon steel pipes, tar-epoxy coated steel pipes, etc. Further, even if glass fiber, slag wool, etc. are used in place of Rock Wool 5, the same fire/heat resistance performance and heat insulation performance can be exhibited, and all of these design changes are included in the present invention.

[Effects of the Invention] According to the present invention, even when a large-diameter steel pipe is installed through a fire prevention division, it is easy to satisfy the test standards based on the disaster prevention performance rating of the Building Center of Japan, and it has excellent fire resistance and It has become possible to demonstrate heat resistance and insulation performance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view showing a typical embodiment of the present invention, FIG. 2 is an explanatory view taken from the direction of arrow 11 in FIG. 1, and FIG. 3(a) is an explanatory view showing a conventional example. FIG. 3(b) is an explanatory diagram showing an embodiment of the present invention, and FIG. 4 is a cross-sectional explanatory diagram showing a conventional example. 1... Fire wall 2... Steel pipe 3... Vinyl tape 4... Mortar cement 5... Rock wool 6... Inorganic refractory plate 7... Through hole 8... Heat insulating ceramics Fiber layer 10... Anchor bolt Figure 1 Figure 3 (2) Figure 3 (b)

Claims (1)

[Claims] In a joint structure for steel pipes installed through a slab of a fire protection compartment, the space formed between the outer circumferential surface of the steel pipe and the slab through hole is filled with ceramic fibers, and both end surfaces of the ceramic fiber filled layer are A joint structure for slab-penetrating steel pipes, characterized in that they are sealed by inorganic refractory plates.