JPH0691696B2 - Fireproof airtight wall penetration unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a control wire / cable (hereinafter referred to as a cable) and a signal cable for connecting a central control room from an operating end in a power plant or plant equipment. However, it is concentrated before entering the main control room, and the cable penetration hole through which the cable is introduced from the concentrated room (this room is called the cable central room) through the wall into the main control room is airtight. The present invention relates to a fireproof airtight wall penetrating unit.

[Conventional technology and its problems]

The control cable and signal cable extending from the operation end and control end of the power plant or its plant are collected in the cable central room, and are grouped for each system, and the central part is passed through the through hole between the cable central room and the central control room. Is pulled into the control room,
Connected to each instrument on the control panel.

By the way, if a fire should occur in the cable concentration room, it is common to release carbon dioxide gas or CFC gas into the cable concentration room to extinguish the suffocation.

However, if gas leaks from the cable through hole to the control room, the central control room becomes oxygen deficient, which poses a risk of secondary disaster to personnel in the control room. Further, when a cable insulator, particularly a corrosive combustion gas such as vinyl chloride, is emitted, if the gas invades, the control device may be corroded and uncontrollable.

Therefore, the applicant of the present invention has filed Japanese Utility Model Application No.
No. 149417), "Asbestos foam is closely arranged at both ends inside the frame to form a fireproof heat insulating layer, and a required number of cables are attached to a unit in which a required number of rods for holding the asbestos foam are provided. We have proposed a "fireproof and airtight unit, which is made by inserting a reaction-curable sealing material into the central space, and has penetrated through it."

However, in this fireproof airtight unit, it is necessary to use a cable insertion jig to insert the cable, so the cable insertion work is complicated. For this reason, there is a demand that "I want something that allows the cable to be inserted easily without using a jig." This requirement comes from fewer skilled construction workers and higher wages.

Also, asbestos foam is used for the fireproof insulation layer, but today,
Since asbestos is a carcinogen, its use is discouraged and there is an urgent need to employ other insulation materials. Therefore, it is possible to use a ceramic wool mat that is not carcinogenic, but this mat is inferior in elasticity and resilience compared to asbestos foam, so after the cable is inserted, its insertion hole does not adhere sufficiently, There is a risk that the sealing material before solidification may leak. This leakage becomes larger as it goes downward due to the relation of the liquid head pressure.

In view of the above, the present invention provides a fireproof airtight wall penetrating unit that allows a cable to be inserted without using a cable insertion jig, and that does not use asbestos for a fireproof heat insulating layer and does not leak a sealing material. The purpose is to

[Means for Solving the Problems]

In order to achieve the above object, in the present invention, the front and rear of the frame body is closed by a refractory heat insulating layer, and a liquid sealing material that is solidified over time is injected between the fire resistant heat insulating layers, and the fire resistant heat insulating layer,
In a conventionally known fireproof airtight wall penetrating unit in which a required number of cables are inserted into a liquid sealing material and a fireproof heat insulating layer, the fireproof heat insulating layer is formed of a ceramic wool mat, and the mat is slit laterally or vertically. And the slit is used as an insertion passage for the electric wire / cable, and a rod for pressing the divided ceramic wool mat on the front and rear surfaces is provided between the inner surfaces of the frame body, and the liquid of the slit is formed. On the sealing material injecting side, brushes with bristle tips extending from both sides of the slit toward the opposite side and crossing each other over the entire length are provided, and the thickness of the brush at the bottom of the frame is larger than that at the top. It is configured as follows.

[Action]

The fire-resistant airtight wall penetrating unit according to the present invention configured as described above has a fireproof heat-insulating layer formed of a ceramic wool mat to prevent the unit from burning due to a fire and to perform a heat-insulating action. Retained.

Further, the cable is inserted along the slit of the ceramic wool mat, and the gap on the injection side of the sealing material generated at that time is covered with a brush to prevent the liquid sealing material from leaking. At this time, at the bottom of the frame, the liquid head pressure of the sealing material is high, but since the thickness of the brush crossing is large, the leakage prevention effect is also high.

〔Example〕

As shown in FIGS. 1 to 3, a steel plate 2 is embedded in the front surface of the wall through hole 1, and a flange 3a is welded to the steel plate 2 to form a frame 3 (height 262 mm × width 183 mm). × depth 30
0 mm) is set in the wall through hole 1. Ceramic wool mats 4 (thickness: 94 mm) are fitted in the front and rear of the frame body 3, and the mats 4 are divided by vertical slits 5. The mats 4 on the dividing surfaces (slits) are butted with each other to form a cable insertion passage 5. A brush 6 (total length 30 mm × bristles 25 mm × apparent thickness 8 mm) is provided in the cable insertion path (slit) 5 over its entire length, and the brush 6 covers the slit 5.

The brushes 6 are provided with a pair of vertical cored wires that are laterally planted on both sides of the slit 5 so that the tips of the brushes extend to the opposite side, and the brushes cross at the bottom of the frame 3 (unit U). Downward
The thickness of the brushes 6 that overlap with each other at the 1/3 part (first
In the figure, the left and right direction, 6a portion) is enlarged, and the core metal is welded to the frame body 3. A lateral metal stopper is provided on the metal core, and this metal stopper is provided on the rod 7 and the ceramic wool 4 described later. The brush 6 is attached by means such as being interposed therebetween. Thickness and length of the thick portion 6a (length in the vertical direction)
Is appropriately determined in consideration of the viscosity of the liquid sealing material 8 to be described later, and the thickness portion 6a may make one brush 6 thicker, and the quality of the hair may be horsehair or comb hair. , Nylon hair, polypropylene hair, etc. are used.

On the front and rear surfaces of the ceramic wool mat 4, rods 7 that press against the surfaces are provided between the upper and lower inner surfaces of the frame body 3, and the rods 7 allow the mat 4 to be compressed in the frame body 3.
A fireproof heat insulating layer is formed inside. In the embodiment, the flame-retardant sheet 4 ′ is provided between the rod 7 and the mat 4.
This flame-retardant sheet 4'presses and protects the surface of the ceramic wool mat 4. A space 9 (88 mm) for injecting the liquid sealing material 8 which solidifies with time is provided between the fireproof heat insulating layer before and after this, that is, the central portion of the frame body 3.
A sealing material injection hole 10 and an exhaust hole 11 are formed in the upper part of the front surface. Both holes 10 and 11 are formed by passing a cylinder through the ceramic wool mat 4.

In addition, a guide plate 12 having a V-shaped cross section is provided in the space 9 between the slits 5 over the entire length in the vertical direction.
Thus, the cable a inserted from the one-way insertion passage 5 is guided to the other insertion passage 5. The guide plate 12 is fixed to the frame body 3 via a rod 7 '. The guide plate 12 may be provided as needed.

The unit U of this embodiment is configured as described above, and after the unit U is inserted and set in the wall through hole 1, 10 mmφ × 27 pieces, 15 mmφ × 33 pieces of the simulated electric wire / cable a are inserted into the cable insertion path. Insert along 5 in sequence. At this time, when the cable a is inserted as shown by the arrow in FIG. 3, the fibers of the ceramic wool mat 4 buckle and retract, and the cable a passes along the butt interface. Further, in the space 9 for injecting the sealing material, the cable a is regulated by the guide plate 12 and reaches the abutting portion (the cable insertion passage 5) of the rear ceramic wool mat 4 and is inserted along the same interface. When the insertion of one cable a is completed, the next cable a is sequentially inserted so that the next cable a is placed on it.

When one cable insertion passage 5 is full, the next insertion passage 5
The cable a is inserted in the same manner as described above. When the desired number of cables a have been inserted, the sealing material 8 is solidified with time from the sealing material injection hole 10 (viscosity at injection 16000 cps, solidification time
15 minutes) is injected into the space 9. At this time, the hopper p shown in FIG. 4 is used to raise the head. Also,
Since the side surface of the space 9 of the cable insertion path 5 is covered with the brush 6, the leakage of the sealing material 8 through the insertion path 5 is prevented.

After injecting the sealing material 8 and leaving it for a certain period of time, the sealing material 8
After confirming that the resin has hardened, remove the hopper p.
After the hopper p is removed, a recess is formed, so that a blind plug of a heat insulating material (for example, ceramic wool) is filled in the recess, and the production of the fireproof airtight wall penetrating portion according to this embodiment is completed.

Although the rod 7 is arranged in the vertical direction in the embodiment,
Depending on the insertion condition of the cable a, the cable may be laterally or in a lattice shape, and the number thereof may be increased or decreased depending on the size of the frame 3, the number of cables a to be inserted, and the thickness or weight. Further, the cable insertion hole 5 can also be provided in the lateral direction.

Further, as the sealing material 8, a mixture mainly composed of liquid chloroprene rubber may be used, but if it is easy to inject and can maintain airtightness after reaction curing (urethane type, silicon type, etc.), it is appropriately selected and used. it can.

Next, the test results of the airtightness and fire resistance of the examples will be described.

In the airtightness test, the fireproof airtight unit U of the example was attached to the test chamber 31 (45 cm × 45 cm × 45 cm) shown in FIG. 5, the pressure inside the chamber 31 was set to 400 mmAq, and the pressure drop after 1 hour was measured. The results are shown in Table 1. In FIG. 5, 32 is a pressure gauge and 33 is an air supply port.

The fire resistance test is based on IEEE, std634, and when Example U is attached to the fire resistant board frame 41 shown in FIG. 6 and the flange side is exposed to the flame of 1050 ° C. by the burner 42 for 3 hours, the other side exposed to the flame The results of measuring the temperature of are shown in Table 1.

From this result, it can be understood that the unit U of the example is sufficiently satisfactory in airtightness and fire resistance.

〔The invention's effect〕

As can be seen from the above description, according to the present invention, a cable can be inserted without a jig such as a cable insertion jig, and workability is improved. Also, asbestos is not used, so there is no danger of cancer.

Further, there is no leakage of the liquid sealing material before solidification.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a fireproof hermetic wall penetrating unit according to an embodiment of the present invention in use, FIG. 2 is a right side view of FIG. 1, and FIG. 3 is a XX line of FIG. Sectional view, FIG. 4 is a side view of a hopper for injecting a sealing material, FIG.
FIG. 6 is an explanatory view of the fire resistance test. 1 ... Wall through-hole, 3 ... Frame, 4 ... Ceramic wool mat, 5 ... Cable insertion path (slit), 6 ... Brush, 7 ... Rod, 8 ... Liquid sealing material, 9 ... Space, 12 ... Information board.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kihachi Ohnishi 2-3-1 Iwata-cho, Higashi-Osaka City, Osaka Prefecture Tatsuta Electric Wire Co., Ltd. (72) Inventor Tetsuo Uchino 2-3-Iwata-cho, Higashi-Osaka City, Osaka No. 1 Tatsuta Electric Cable Co., Ltd.

Claims (1)

[Claims] 1. A front and rear inside of a frame is closed by a fireproof heat insulating layer, and a liquid sealing material which is solidified with time is injected into the fireproof heat insulating layer, and the fire resistant heat insulating layer, the liquid seal material and the fire resistant heat insulating layer are
In the fireproof airtight wall penetrating unit for inserting a required number of electric wires / cables, the fireproof heat insulating layer is formed by a ceramic wool mat, and the mat is divided by forming slits in the horizontal direction or the vertical direction and dividing the slits. A rod for pressing the front and rear surfaces of the divided ceramic wool mat is provided between the inner surfaces of the frame body as an insertion passage for the electric wire / cable, and the entire length is provided on the liquid seal material injection side of the slit. Brushes with bristle tips extending from both sides of the slit toward the other side and crossing each other are provided,
Further, the fire-tight airtight wall penetrating unit, characterized in that the thickness of the brush at the bottom of the frame body is larger than that at the top.