JPH0340052Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fireproof cover that is used to surround and cover a long object on a rack, such as an electric cable, to protect the long object from fire.

[Prior art]

Conventionally, in the trunk part of a communication cable, a large number of cables 1, which are made up of hundreds to thousands of thin core wires, are connected at predetermined intervals from the wall of an underground tunnel called a tunnel 2, as shown in Figure 5. The cable is placed on a protruding arm-like rack 3, and the cable is tied with a tie string 6 to a arm 5 whose tip is covered with a protective cap 4, as shown in FIG.

In general, the current flowing through such communication cables is weak, and the electrical properties of the covering material are mainly considered, and the cable itself is not particularly flame-retardant. For this reason, if a fire breaks out inside the tunnel, the cable sheathing layer will burn and the internal core wire will break, causing major disruption to the communication line.

Therefore, in order to prevent such accidents, the means to make existing cables flame retardant are to wrap flame retardant tape around the outer circumference of the cable, or to apply a paint that has been made flame retardant by adding inorganic substances. There is.

[Problem that the invention attempts to solve]

However, the method of winding the tape is difficult because the width of the fire-resistant tape is usually 50 to 75 mm, the cables are placed in close contact with each other on the rack, and the distance between the top and bottom of the rack is extremely low. The length of the road was several hundred kilometers, so it was almost impossible to wrap it with tape.

In addition, there are methods to apply paint by brushing or spraying, but the humidity inside underground caverns is high and it takes time for the paint to dry, so in order to increase the fire prevention effect, it is necessary to apply two or three coats. Applying multiple coats not only takes a long time to dry, but also requires a large amount of man-hours, and even if the paint film is as thick as it is, it is possible to avoid the effects of a fire that hits the cable directly, but it is important to avoid the effects of high heat transmitted through the paint film. I couldn't do it.

The present invention was made to solve the problems of the conventional technique, and provides a fireproof cover that has an extremely simple structure and can easily make two spans of a long object fireproof at once. The purpose is to

[Means for solving problems]

The fireproof cover of the present invention is capable of moving a long object in the circumferential direction every two spans of the rack, which is placed on a rack with arms protruding horizontally from columnar objects installed at desired intervals. The enclosing fireproof cover is made of a pine-like material in which a fireproof ventilation barrier layer is provided on at least one side of a noncombustible heat insulating material layer, and the entire outer periphery is covered with a fireproof cloth-like material. The rack has a width sufficient to circumferentially surround the long object, and two racks with a length slightly longer than one span length and one rack with a length less than one span length are arranged in series in sequence. A rectangular shape in which parts slightly longer than one span length are overlapped at the end edges, and the overlapped parts are relatively overlapped, excluding the part where the rack arm passes through in the width direction and the part that straddles the rack columnar part. The fireproof cover is sewn together, and is characterized in that a desired number of coupling devices that engage with each other are fixed to opposing side edges in the longitudinal direction of the fireproof cover.

This fireproof cover covers two spans of the long object on the rack at once with the connected pine-like parts of one span length, and the part of the end part less than one span length (hereinafter referred to as By sequentially applying the leading part of the span section of the next fireproof cover on the outer periphery of the overlapping part (referred to as the overlap part), it becomes an integrated fireproof cover that protects long items on the rack from coming into contact with external flames or heat. I can do it.

The fireproof cloth material for this fireproof cover is preferably made of glass fiber cloth, which has excellent fireproof performance, and is impregnated with acrylic or silicone resin to eliminate air permeability and strengthen the fireproof performance.

In this invention, a ventilation blocking layer such as aluminum foil is added to the fireproof cloth material, which allows heat from the outside to radiate to the outside and prevent it from penetrating into the interior, eliminating breathability and further enhancing the fire prevention effect. It is to increase it.

Therefore, this ventilation blocking layer (aluminum foil) may be provided only on the surface that becomes the outer surface when applied to a long object.

Further, as the heat-resistant heat insulating layer located inside the fire-resistant cover of the present invention, fire-resistant fibers such as rock wool, glass wool, and ceramic fiber are suitable. The desired thickness of this heat-resistant heat insulating layer can be selected depending on the purpose, but in places where the distance between the top and bottom of the rack is particularly narrow, it may be omitted and only the fire-resistant cloth and the ventilation blocking layer are used.

The reason why the fireproof cover of the present invention has two leaves for one span length and one cover for less than one span length is because one span length of a communication cable rack is usually one.
This is for ease of handling, so if the span interval is narrower or wider than this, it is better to adjust the number of pieces as appropriate.

In addition, the structure of one leaf per span in this way allows only the side edges to be sewn, so it can be easily sewn using a sewing machine with a shallow seam, and the inside part is easily torn. This is to avoid making unnecessary needle holes in the aluminum foil and to minimize the number of suture lines.

The present invention can be applied to any existing long object placed on a rack, not just cables, to provide a fireproof structure.

〔Example〕

Examples of the present invention will be explained below in more detail with reference to the drawings.
Add aluminum foil to a glass cloth impregnated with acrylic resin (JIS R3414 EP-18) measuring 840m/m and fold it in half to form a non-combustible insulation layer.Density: 0.18/cm ^3Thickness : 28m/m 800mm Two pieces of fireproof cover base fabric 7 and 7' were prepared by sandwiching a 800 mm x 800 mm ceramic wool blanket and sewing the side ends where the glass cloth was not connected in a U-shape.
In addition to this, 800mm x 200mm is used for the overlap part.
A fireproof cover base fabric 7″ of mm was produced in the same manner.

Then, these trilobal pieces are arranged in series as shown in Fig. 1 and connected as shown in Fig. 3.The side edges slightly longer than the length of one span are overlapped, and the overlapped portion is covered with a ribbon-like fire-resistant cloth material 8. Except for the mounting rack arm through-hole 9 and the portion 10 corresponding to the rack column, these were all sewn together in the direction of the arrow in FIG. 3 to connect them. As shown in Figure 1, four bands 11 of length 20 cm made of fire-resistant cloth are sewn to the side edge of the rack that contacts the rack column, and a metal ring 1 is sewn to the opposite side edge.
2. I sewed 2 pieces in 4 places.

Next, to explain how to attach the fireproof cover of the present invention to the cable on the rack, as shown in Figure 4, first pass the rack arm through hole 9 through the rack arm of the fireproof cover for cables, and then sew the band. Lift the side edge of the attached side from below the rack through the back of the rack and place it over the side edge where the metal ring on the cable of the rack is attached, then pass the band through the metal ring and connect both. to be fixed.

The fireproof cover shown in Fig. 1 has the advantage that it can be sewn using a sewing machine with a shallow depth and fewer seams, since the side edges of a simple rectangular item are sewn together in a straight line. If the width of the rack column is wide, this part that corresponds to the rack column will roll up and create a gap, which may cause the inside of the fireproof cover to be affected by external heat. may be provided.

The fireproof sheet shown in Figure 1 was attached to three communication cables with polyethylene sheaths of 50 mm in diameter placed on a rack, and heated with a flame of approximately 815°C using a gas burner for 5 minutes from a distance of approximately 75 mm. When the cable was observed, the surface of the polyethylene sheath had softened, and only a slight glass cloth pattern was observed on the surface of the sheath, but no abnormality was observed inside the cable.

[Effect of idea]

As explained above, the cable fireproof cover of the present invention has a simple structure, so it is easy to sew and can be manufactured at low cost. It is useful because it can protect things from flames and heat.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention. FIG. 2 is a front view of another embodiment. FIG. 3 is an explanatory diagram of the suturing method. FIG. 4 is a partially cutaway perspective view of the fireproof cover of the present invention applied to a cable. FIG. 5 is a sectional view of the tunnel, and FIG. 6 is an explanatory diagram of the cable on the rack in the tunnel. 1... Cable, 2... Tunnel, 3... Rack,
4... (arm wood) protective cap, 5... arm wood, 6...
... Binding string, 7, 7', 7'' ... Fireproof cover base fabric, 8
... Ribbon-like fire-resistant cloth material, 9 ... Rack arm through hole, 10 ... Portion corresponding to rack column, 11
... Band, 12 ... Metal ring, 13 ... Notch.

Claims (1)

[Scope of utility model registration request] Fire resistance that circumferentially surrounds a long object placed on a rack with arms extending horizontally from columnar objects installed at desired intervals, every two spans of the rack. The cover is made of a pine-like material in which a fire-resistant ventilation barrier layer is provided on at least one side of a non-combustible heat insulating material layer, and the entire outer periphery is covered with a fire-resistant cloth-like material, and its shape is the same as that of the long length. With a width sufficient to circumferentially surround the object, two leaves with a length slightly longer than one span of the rack and one with a length less than one span are sequentially arranged in series at the edge. It has a rectangular shape in which parts slightly longer than the length of one span are overlapped, and the overlapping parts are relatively overlapped and the edges are sewn in the width direction except for the part that penetrates the rack arm and the part that hits the rack column. . A fireproof cover, characterized in that a desired number of coupling tools that engage with each other are fixed to opposite widthwise side edges in the longitudinal direction of the fireproof cover.