JP4340525B2 - Fireproof coating structure for cable conduit in tunnel - Google Patents

Description

The present invention relates to a fire protection structure of a cable duct that will be installed in the tunnel inner wall to attached the electrical and communications cables in the tunnel.

  Usually, a cable conduit is installed in the tunnel, and one or a plurality of electric / communication cables are attached inside the tunnel. The cable conduit is composed of a steel conduit tube or a hard polyvinyl chloride tube, and an electric / communication cable is often used which is covered with a plastic coating material such as vinyl chloride. When a fire, etc. occurs in a tunnel, there is no escape from heat because of the special environment of the tunnel, and the cable conduit is exposed to high temperatures (1200 ° C or higher) in a short time, and the electricity installed inside・ Severe troubles such as damage or disconnection of communication cable may occur. Therefore, in order to cut off the heat caused by the fire, a protective box composed of a ceramic fireproof plate and rock wool has been developed. For example, the cable conduit attached to the inner wall of the tunnel is surrounded by a protective box to prevent the heat from the fire. Attempts have been made to block cable conduits.

That is , Patent Document 1 discloses that a facility provided by using an inner wall of a tunnel is surrounded by a protective box having a fireproof plate structure and cut off from the tunnel space, and is placed in the protective box in the event of a fire in the tunnel due to a vehicle accident or the like. Disclosed is a fireproof protection method for electrical / communication cables and the like in a tunnel, wherein the propagated heat is released to the concrete housing side through a metal plate in contact with the concrete housing side of the tunnel provided on the inner surface side of the protection box Has been.

  Furthermore, in Patent Document 2, a first heat insulating material layer having a heat-resistant film for joining the outer periphery of a cable protection tube containing a cable and preventing passage of steam on one or both of the inner surface and the outer surface, It consists of a heat-absorbing material formed on the outer periphery of the first heat-insulating material layer and containing moisture consisting of a liquid or a gel substance in the bag, and a second heat-insulating material layer provided on the outer periphery of the heat-absorbing material. An outdoor installation type fireproof covering structure for a communication cable protection tube characterized by being installed and used is disclosed.

Patent Document 3 discloses a metal with a refractory heat insulation coating in which the bottom of a metal box of the duct body 1 is covered with a bottom refractory heat insulating covering material, and the side wall of the box is covered with a side refractory heat insulating covering material. in manufacturing the duct, between the corners of the joint portion of the bottom insulating refractory coating material and the side insulating refractory coating material, a spacer over molded into a predetermined shape by a flame-retardant material is sandwiched, the spacer over the between the junction portion A metal duct with a refractory insulation coating, characterized in that a vertical polymerization portion is provided which is connected to the upper surface of the sandwiching portion sandwiched between the two sides and rises along the inner surface of the side portion refractory insulation coating. A fireproof insulation coating structure is disclosed. Further, the patent document 3 describes that “the bottom fireproof insulation coating material 4, the side fireproof insulation coating material 6, and the top fireproof insulation coating material 16 are all the same material as the conventional fireproof insulation coating material, that is, zonotlite. Calcium silicate molding materials, etc., mainly composed of zirconia crystals, wollastonite crystals, tobermorite crystals, or mixtures thereof, and containing reinforcing materials such as clay and fibrous materials as necessary Is also described.

  Furthermore, in Patent Document 4, as a calcium silicate material useful as a fireproof covering material for a tunnel structure, a calcium silicate material containing a matrix and a fiber made of calcium silicate hydrate, The calcium hydrate is composed of tobermorite and zonotrite, and the ratio of the X-ray diffraction intensity of the (001) plane of the zonotrite to the (002) plane of the tobermorite is 0.3 as the former / the latter. ˜5.0, and the calcium silicate material contains acicular wollastonite and cellulose pulp in the range of 1-10% by mass in the range of 20-60% by mass as the fiber at 1200 ° C. A calcium silicate material having a residual shrinkage ratio of 5% or less is disclosed.

  Further, in Patent Document 5, as a fireproof coating structure using an endothermic pack, a liquid or gel-like substance such as water or a polymer impregnated with water in a cell partitioned between two films, etc. Wrap a heat-absorbing pack with a heat-absorbing material enclosed and heat-sealed around it, and a fire-resistant insulating material such as an inorganic fiber mixed mat around the wire tube to be fire-resistant coated, and use wire, tape, or wire mesh A fireproof covering structure for a conduit is disclosed which is fixed and covered with a metal plate as necessary.

  Further, Patent Document 6 discloses a coating material that is used by being wound around a pipe line, and the coating material is a flexible structure composed of a three-layer laminate structure of an aluminum cloth protective material, a non-combustible material, and an endothermic pack. A fireproof coating material characterized by being formed into a pouch-like sheet is disclosed.

In addition, in Japanese Patent Application No. 2003-283111 (Patent No. 4066179) , the applicants of the present invention are a cable conduit or cable pipe installed in a tunnel and having one or more cables attached inside. In a fireproof covering structure of a plurality of aggregates of roads, a heat insulating mat material is in contact with and coated on the outer periphery of a cable conduit attached to a tunnel inner wall or a plurality of aggregates of cable conduits. The aluminum foil layer is abutted and covered, and the outer side is surrounded by the tunnel inner wall and the fireproof coating material, so that the cable conduit or a plurality of cable conduit assemblies are shielded from the space in the tunnel. The insulation mat material has a density of 24 to 48 kg / m ³ and a thickness of 15 to 50 mm. The formed cell has a structure in which a heat absorbing material made of water or a polymer impregnated with water or a gel-like substance is enclosed and the periphery is sealed, and has a water content of 4000 to 5000 g / m ^2. It is composed of an endothermic pack layer and a calcium silicate plate layer having a density of 0.8 to 1.1 g / cm ³ and a thickness of 15 to 50 mm, and the endothermic pack layer includes an aluminum foil layer and a space. by being installed to put the tunnel in a cable tube, wherein the internal temperature of the cable conduit when subjected to fire tests 30 minutes at 1200 ° C. based on RABT curve is 85 ° C. or less A fireproof covering structure for roads is proposed.

JP 2002-360722 A Japanese Patent Laid-Open No. 11-46430 No. Sho 63-139894 Specification JP 2003-104769 A JP-A-7-135716 JP-A-9-280480

Here, the RABT curve is adopted as the heating condition in the fire resistance test of the tunnel frame accompanying the recent tunnel construction method such as shield tunnel, submerged tunnel, etc., and the same condition is also applied in the fire resistance test of the cable pipe installed in the tunnel Is required. Since the softening temperature of the covering material used for electric and communication cables attached to cable conduits is usually about 85 ° C, it is used for the fire resistance test of the above-mentioned tunnel body, that is, the fire resistance test at 1200 ° C for 60 minutes. in definitive heating conditions, but the internal temperature of the cable ducts must be less than 85 ° C., is still reality is fire protection structure of this condition full plus cable ducts is not developed.

Accordingly, an object of the present invention, the tunnel in the cable duct fire protection structure of which the internal temperature of the cable ducts may be less than 85 ° C. when subjected to fire tests 60 minutes based-out 1200 ° C. to RABT curve Is to provide.

In other words, fire protection structure of the tunnel in the cable duct of the present invention is attached to the tunnel wall, the refractory of the inner one or a plurality of cable ducts cable is attached or cable ducts plurality collection of a coating structure, the outer periphery of the plurality of assemblies of the cable conduit or cable conduit, insulating mat material in which contact with the coating on the outer periphery of the aluminum foil layer is coated in contact with, the outside of the refractory coating material further surrounded by a second refractory coating material, and the contact portion of the refractory coating material and a second fireproofing material and the tunnel inner wall, in order to prevent a decrease in fireproof heat insulating performance due to gaps between the refractory coating material and the tunnel inner wall by installing the uneven surface adjustment member of the fire protection structure of the cable conduit to have a configuration in which plural assemblies of the cable conduit or cable conduit is disconnected from the space in the tunnel There are, the density of the insulating mat material Waso is 24~48kg / ^{m 3,} there thickness in the range of 15 to 50 mm, the refractory coating material has a density in 0.8~1.1g / cm ³ , A calcium silicate plate having a thickness in the range of 15 to 50 mm, and a liquid or gel substance made of water or a polymer impregnated with water in a cell defined between two films. sealing the periphery to enclose the endothermic material is composed of an endothermic pack layer having a moisture 8000~10000g / m ^2, a facing vital space endothermic pack layer and the insulating mat material aluminum foil layer of the outer circumference of is installed so as to provide said second refractory coating material has a density in 0.8~1.1g / cm ^3, by Rukoto it consists of calcium silicate board having a thickness in the range of 15 to 50 mm, Based on RABT curve Internal temperature of the cable conduit when subjected to fire tests 60 minutes at came 1200 ° C. is equal to or less than 85 ° C..

Moreover, fire protection structure of the cable conduit of the present invention is attached to the tunnel wall, fire protection structure of a plurality of assemblies of one or a plurality of cable ducts cable is attached or cable ducts inside And a heat insulating mat member comprising an aluminum foil layer on at least one surface on the outer periphery of a cable conduit or a plurality of cable conduit assemblies, and if the aluminum foil layer is a single surface, the aluminum foil layer coated in contact so as not to be in contact with the outer peripheral person, the outer surrounded by the tunnel inner wall and the refractory coating material, outside of the refractory coating material is further surrounded by a second refractory coating material, and fireproofing material and a second refractory the contact portion of the dressing and the tunnel inner wall, by placing the uneven surface adjustment member for preventing a gap reduction of fireproof heat insulating performance due between each fireproofing material and the tunnel inner wall, In fire protection structure of a cable conduit plural assemblies of Buru conduit or cable conduit to have a structure that is cut off from the space in the tunnel, the density of the insulating mat material Waso comprising at least one surface of the aluminum foil layer There 24~48kg / ^{m 3,} there thickness in the range of 15 to 50 mm, the refractory coating material has a density in 0.8~1.1g / cm ^3, a thickness within the range of 15 to 50 mm A calcium silicate plate and a heat absorbing material made of a liquid or gel substance made of water or a polymer impregnated with water were sealed in a cell defined between two films, and the periphery was sealed . is composed of a heat-absorbing pack layer having a moisture 8000~10000g / m ^2, the heat absorbing pack layer is placed so that provided facing vital space and the aluminum foil layer of the heat insulating mat member, said second resistance Dressing by Rukoto density thickness in 0.8~1.1g / cm ³ is composed of calcium silicate board which is within the range of 15 to 50 mm, 60 minutes based-out 1200 ° C. to RABT curve internal temperature of the cable conduit when subjected to fire test is characterized in that less than 85 ° C..

Moreover, fire protection structure of the tunnel in the cable duct of the invention, between the aluminum foil layer facing thereto and endothermic pack layer, and characterized in that the space for the steam generated is provided it is intended to.

Moreover, the fireproof covering structure of the cable conduit in the tunnel according to the present invention is such that the calcium silicate plate is composed of tobermorite and zonotlite, and the fiber is 20 to 60% by mass of acicular wollastonite and 1 to 10% by mass. It contains the cellulose pulp of this .

Moreover, fire protection structure of the tunnel in the cable duct of the present invention is characterized in that the spacer is installed at a predetermined interval between the refractory coating material and the second refractory coating material.

Moreover, fire protection structure of the tunnel in the cable duct of the invention, the spacer is characterized in being composed of papermaking gypsum board or calcium silicate board.

Moreover, fire protection structure of the tunnel in the cable duct of the invention, which is characterized in that uneven surface adjustment member is constructed from a laminate of a ceramic wool mat material or calcium silicate board and ceramic wool blankets It is .

According to the fireproof covering structure of the cable conduit in the tunnel of the present invention, even if the volume occupying the tunnel is small compared to the existing fireproof covering structure, it is attached in the cable conduit when a fire occurs in the tunnel. Good fire resistance and heat insulation performance without damaging electrical / communication cables , that is, the internal temperature of the cable line is less than 85 ° C when a fire resistance test is performed at 1200 ° C for 60 minutes based on the RABT curve. There is an effect.

The fireproof covering structure for a cable conduit in a tunnel according to the present invention first comprises a heat insulating mat material on the outer periphery of a cable conduit or a plurality of cable conduit assemblies (hereinafter simply referred to as “cable conduit etc.”). Aluminium foil layer is abutted and coated on the outside, and a heat-resistant covering material composed of a heat absorbing pack layer and a calcium silicate plate is arranged on the outside so that the heat absorbing pack layer faces the aluminum foil layer. The cable is surrounded by a tunnel inner wall and a fireproof coating material, and a second fireproof coating material is installed on the outside of the tunnel with a predetermined interval between the second fireproof coating material and the tunnel inner wall. Surrounding the cable pipeline, etc., and installing a non-land adjuster at the contact site between the fireproof coating and the tunnel inner wall and the contact site between the second fireproof coating and the tunnel inner wall, the cable pipeline and the space in the tunnel the cut-off To have.

In the fireproof coating structure of the cable conduit in the tunnel of the present invention, the cable conduit attached to the inner wall of the tunnel is, for example, a steel conduit (JIS C8305), a hard vinyl chloride tube (JIS K6741), or an FRP (fiber reinforced plastic) tube. Etc. can be used. Further, the electric / communication cable attached to the cable conduit or the like is not particularly limited, and a known / conventional cable can be used. The number of electrical / communication cables attached to the cable conduit is not particularly limited, and may be one or plural. Further, the configuration of the plurality of cable conduits is not particularly limited , and may be a configuration of a plurality of cable conduits.

The outer periphery of the cable conduit or the like having the above-described configuration is covered with a heat insulating mat material, and the outer periphery thereof is covered with an aluminum foil layer. Here, the aluminum foil layer, which interior moisture endothermic pack to be described later by heat is corrupt acts to prevent direct contact with the cable conduit becomes steam, etc., therefore the aluminum foil layer it is is important, which is disposed on the outer peripheral surface also reduce the insulating mat material. If the aluminum foil layer is disposed only on the inner peripheral surface of the heat insulating mat material, that is, the surface in contact with the cable conduit, the water vapor temperature directly propagates from the aluminum foil layer to the cable conduit, etc. This is not preferable because it leads to an increase in internal temperature. The density of the heat insulating mat is in the range of 24 to 48 kg / m ³ , preferably 30 to 40 kg / m ³ . Here, when the density is less than 24 kg / m ^3, it is not preferable because it may become non-uniform when covering a cable pipe or the like, and when the density exceeds 48 kg / m ³ , This is not preferable because the coating property is lowered and the coating operation is difficult to perform, and the coating may become non-uniform. The thickness of the heat insulating mat is 15 to 50 mm, preferably 20 to 40 mm, and most preferably 25 to 30 mm. If the thickness of the heat insulating mat is less than 15 mm, it is not preferable because the internal temperature of the cable conduit and the like tends to rise when receiving heat, and if the thickness of the heat insulating mat exceeds 50 mm, This is not preferable because the volume of the fireproof covering structure in the space becomes too large. The material of the heat insulating mat is not particularly limited as long as it has heat insulating properties and flexibility and can be wound, and for example , glass wool, rock wool, ceramic wool or the like mat or felt is used. Glass wool is particularly preferable from the viewpoints of price and workability. The thickness of the aluminum foil layer is 4 to 20 μm, preferably 5 to 15 μm. Here, if the thickness of the aluminum foil layer is less than 4 μm, it is not preferable because the aluminum foil layer easily breaks during construction, and if the thickness of the aluminum foil layer exceeds 20 μm, the cost increases accordingly. It is not preferable because an improvement in fire resistance corresponding to that cannot be obtained.

In the fireproof covering structure of the cable conduit in the tunnel according to the present invention, the outer periphery of the cable conduit or the like is covered with a heat-insulating mat material, and the outer periphery is further covered with an aluminum foil layer. Instead of this, a heat insulating mat member having an aluminum foil layer on at least one surface can be applied to the outer periphery of a cable conduit or the like. In this case, in the insulating mat material comprising an aluminum foil layer on one side, it is important that the aluminum foil layer is covered so as not to be in contact with the outer periphery of the cable ducts and the like.

A heat insulating mat material coated with an aluminum foil layer in contact with the outer periphery as described above and / or a cable conduit coated with a heat insulating mat material having an aluminum foil layer on at least one surface is attached to the inner wall of the tunnel. The attachment method is not particularly limited, and various methods such as hanging from the upper part of the tunnel with an attachment installed on the inner wall of the tunnel or fixing with an attachment can be employed.

Next, a fireproof covering material is installed so as to surround the cable conduit covered with the heat insulating mat member attached to the inner wall of the tunnel, thereby blocking the cable conduit from the space in the tunnel. Here, the fireproof covering material used for the fireproof covering structure of the cable conduit in the tunnel of the present invention has a two-layer structure including an endothermic pack layer and a calcium silicate plate. The endothermic pack layer encloses an endothermic material made of a liquid or gel-like substance made of water or a polymer impregnated with water in a cell defined between two films, and the periphery is sealed by a method such as heat sealing. It has a sealed configuration. For example, the endothermic pack layer is water in a cell that is partitioned between two films formed by sandwiching an aluminum foil in a sandwich structure between two synthetic resin films such as nylon film and polyethylene film. Alternatively, a liquid such as a polymer impregnated with water or an endothermic material such as a gel-like substance is enclosed, and the surroundings are heat-sealed, for example, a 5 to 10 cm square pack, that is, a sheet in which cells are continuously installed Can be. The endothermic pack layer has a water content of 8000 to 10000 g / m ² , preferably 8600 to 9400 g / m ² . When the moisture content of the endothermic pack layer is less than 8000 g / m ² , the internal temperature of the cable pipe line is 85 ° C. in the fireproof coating structure at 1200 ° C. based on the RABT curve in the fireproof coating structure of the cable pipe in the tunnel of the present invention. And if the water content of the endothermic pack layer exceeds 10,000 g / m ² , the thickness of the endothermic pack layer becomes too thick, and the fireproof coating occupies the space in the tunnel accordingly. This is not preferable because the volume of the structure becomes large. Incidentally, the endothermic pack layer is optimally used in a cell enclosing the moisture 30 g 0.99 per 1 m ² things (4500g / ^{m 2)} thickness 4.5mm double.

The density of the calcium silicate plate constituting the refractory coating material is a 0.8~1.1g / cm ^3, preferably in the range of 0.9~1.05g / cm ^3. Here, when the density is less than 0.8 g / cm ^3, it is not preferable because it is easily damaged, and when the density exceeds 1.1 g / cm ³ , the heat insulation performance is deteriorated, which is not preferable. Furthermore, the thickness of the calcium silicate plate is in the range of 15-50 mm, preferably 20-40 mm, optimally 25-30 mm. Here, when the thickness is less than 15 mm, it is not preferable because fire resistance performance is lowered, and when the thickness exceeds 50 mm, it is preferable because the volume of the fireproof coating structure in the space in the tunnel becomes large. Absent. Although the calcium silicate plate is not particularly limited, for example, a matrix as described in Patent Document 4 is composed of tobermorite and zonotolite, and 20 to 60% by mass of acicular wollastonite and fibers are used. A calcium silicate plate containing 1 to 10% by mass of cellulose pulp can be suitably used.

  In addition, the lamination | stacking method of an endothermic pack layer and a calcium silicate board is not specifically limited, For example, it laminates | stacks by adhere | attaching or attaches the seal part of an endothermic pack layer to a calcium silicate board using a tucker. Can be laminated.

Fireproofing material having the above-described configuration is to face the insulating mat material endothermic pack layer covers the attached cable ducts or the like to the tunnel inner wall, is and tunnel inner wall and areas Ru surrounded by fireproof coating materials It is installed on the inner wall of the tunnel so as to be cut off from the space in the tunnel. A method of installing a refractory coating material is not particularly limited, established the Furiku adjusting material to the tunnel inner wall, it is also possible to attach the fireproof coating materials to the uneven surface adjustment member. The seams of the seam and fireproofing material comrades uneven surface adjustment member and the refractory coating material can be sealed using a sealing agent such as silicone sealants have a fireproof thermal insulation. Furthermore, the seam portion in the length direction can be constructed by installing a ceramic or steel base on the seam portion and attaching a fireproof coating, and sealing the seam portion using a sealing agent in the same manner as described above. .

Here, the unevenness adjusting material installed on the inner wall of the tunnel is a fireproof / heat insulation due to a gap between the inner wall of the tunnel and the fireproof coating material that may be caused by the distortion of the tunnel inner wall or the second fireproof coating material described later. It is intended to prevent a decrease in performance, and is composed of, for example, a ceramic wool mat or a laminate of a calcium silicate plate and a ceramic wool blanket. And the installation method to the inner wall of a tunnel is not specifically limited, For example, when installing a fireproof covering material and a 2nd calcium-silicate board in a tunnel inner wall, between them and an inner wall of a tunnel. Install by sandwiching or fixing the belt-like unevenness adjusting material to the wall surface of the tunnel inner wall with concrete anchors and bolts in the length direction of the fireproof coating structure of the cable conduit in the tunnel Can do. Then, the fireproofing material is disposed inwardly relative uneven surface adjustment member, installing a second refractory coating material described later to the outside.

In addition, when installing the fireproof covering material on the inner wall of the tunnel , the outer periphery of the cable pipe or the like, the heat insulating mat material coated with an aluminum foil layer on the outer periphery, or the heat insulating mat material having an aluminum foil layer on at least one side, and the fireproof covering without in contact with the endothermic pack layer of wood, certain intervals, for example, may be attached to the refractory coating material so as to have a space on 5mm or more. Here, by providing a space, that is, by providing a space, it is possible to further enhance the effect of suppressing the temperature rise of the cable pipe line or the like due to water vapor generated in the space due to breakage of the heat absorption pack layer. Note that if the distance exceeds 150 mm, the volume of the fireproof covering structure occupying the space in the tunnel increases, which is not preferable.

In the fireproof coating structure in the tunnel of the present invention, the second calcium silicate plate layer is installed outside the fireproof coating material at a predetermined interval from the fireproof coating material, and is surrounded by the tunnel inner wall and the second fireproof coating material. the zone Ru is isolated from the space in the tunnel. The second refractory coating material is composed of a calcium silicate plate, and its density, thickness, and the like are similar to those of the calcium silicate plate constituting the calcium silicate plate of the fireproof coating material. Moreover, the method of installing the second fireproof coating material is not particularly limited. For example, a non-land adjustment material can be installed on the inner wall of the tunnel, and the second fireproof coating material can be attached to the non-land adjustment material. In addition, the unevenness adjusting material can be shared with the unevenness adjusting material for attaching the above-mentioned fireproof covering material. Further, the joint between the unevenness adjusting material and the second fireproof coating material or the joint between the fireproof coating materials can be sealed using a sealing agent having fire resistance and heat insulation, for example, a silicone sealing agent. Furthermore, the seam portion in the length direction can be constructed by installing a ceramic or steel base on the seam portion and attaching a fireproof coating, and sealing the seam portion using a sealing agent in the same manner as described above. .

In addition, when installing the said fireproof coating material and the 2nd fireproof coating material at predetermined intervals, this space | interval is at least 4 mm, Preferably it is about 4-10 mm, The optimal is about 4-5 mm. By providing this space, that is, a space, it is possible to dramatically improve the fire resistance and heat insulation performance in the fire resistant heat insulation structure of the cable conduit in the tunnel of the present invention. In addition, in order to ensure a space between the fireproof coating material and the second fireproof coating material, between the fireproof coating material and the second fireproof coating material, an inorganic molded body having a thickness corresponding to the space interval, for example it is possible to a strip-shaped plate made of a paper-making gypsum board or calcium silicate board or the like along the length of the refractory coating structure of a tunnel in the cable conduit as spacers placed at a predetermined interval.

  According to the fireproof covering structure of the cable conduit in the tunnel of the present invention having the above-described configuration, the time specified in the “Guideline for Road Tunnel Equipment and Operation (RABT)” of the Road Construction Bureau of the German Federal Ministry of Transport— When a fire resistance test is performed at 1200 ° C. for 60 minutes based on the temperature curve “RABT curve: FIG. 2”, the internal temperature of the cable conduit or the like can be suppressed to less than 85 ° C.

One embodiment of the present invention will be described with respect to a fireproof covering structure for a cable line in a tunnel shown in FIG . An ALC plate (1) with a length of 1820 mm, a width of 600 mm, and a thickness of 100 mm is used as an alternative to the inner wall of the tunnel, and eight FRP pipes (2a to 2h) are suspended on the lower side in the length direction (Fig. (Not shown). The FRP cable conduits (2a), (2b), (2g), and (2h) are optical cables (covering material: vinyl chloride) (3) and FRP cable conduits (2c) (2d) (2e) ( In 2f), an electric cable (covering material: vinyl chloride) (4) was attached.
Next, glass wool (glass wool density: 32 kg / m) comprising eight FRP cable conduits (2a to 2h) as an aggregate and having an aluminum foil layer (aluminum foil thickness: 7 μm) (6) on one side of the outer periphery thereof. ³ , thickness: 25 mm) (5) was used as a heat insulating mat material, and the aluminum foil layer (6) was in contact with the FRP cable conduits (2a to 2h) so as not to contact them.
Next, a non-land surface adjusting material (9) made of a ceramic wool mat material having a thickness of 50 mm and a width of 60 mm is installed along the length direction on the ALC plate (1), and the inside of the bottom surface of the non-land surface adjusting material (9). In addition, the endothermic pack layer (7) and the silica are surrounded so as to surround the side and bottom surfaces of the FRP cable pipes (2a to 2h) coated with glass wool (5), which is a heat insulating mat material provided with an aluminum foil layer (6). A fireproof covering material made of a calcium oxide plate (8) was placed so that the endothermic pack layer (7) faced the aluminum foil layer (6) and provided a space .
The endothermic pack layer (7) is formed by enclosing 30 g of water in a cell formed by partitioning between two films formed by sandwiching an aluminum foil between two nylon films in a sandwich structure. A cell having 150 cells per 1 m ² (4500 g / m ² ) and having a thickness of 4.5 cm was used in duplicate.
The calcium silicate plate (8) uses slaked lime as a calcareous raw material, and ferrosilicon having an Al ₂ O ₃ content of 0.5% by mass and an SiO ₂ content of 98% by mass as amorphous silicic acid as the siliceous raw material. Using dust and powdered silica with an Al ₂ O ₃ content of 1% by mass as crystalline silicic acid, an SiO ₂ content of 98% by mass and a brane value of 3000 cm ² / g, an average fiber length of about 100 μm and an aspect ratio Using about 10 acicular wollastonite and 200 ml of CSF beaten cellulose pulp, CaO / SiO ₂ mass ratio 1.05, amorphous silicic acid / crystalline silicic acid mass ratio 0.18, slaked lime 43.7 mass %, Ferrosilicon dust 5% by weight, powdered silica 28.3% by weight, acicular wollastonite 20% by weight, beaten cellulose pulp 3% by weight -Was prepared by heating and curing at 90 ° C. for 2 hours, followed by pressure dehydration molding at a pressure of 4 MPa to form a cake, and the resulting cake was autoclaved at 195 ° C. for 10 hours to obtain a density of 1 0.0 and a thickness of 25 mm. In addition, the ratio of the X-ray diffraction intensity of the zonotlite (001) plane / tobermorite (002) plane of the obtained calcium silicate plate was 1.1.
The fireproof covering material was laminated by attaching the seal portion of the endothermic pack layer (7) having the above configuration to the calcium silicate plate (8) with a tacker.
Further, the joint between the non-land surface adjusting material (9) and the fireproof coating material and the joint between the fireproof coating materials were sealed with a silicone sealant.
Next, on the lower surface of the uneven surface adjustment member (9), so as to surround the outside of the refractory coating material, 30mm wide in the longitudinal direction which is installed at a predetermined interval between the refractory coating material, 4mm thick sheet forming gypsum The 2nd fireproof covering material (10) was installed through the spacer (11) which consists of a board. In addition, in the embodiment shown in FIG. 1, it is set as the structure which contacts the 2nd fireproof coating material (10) in the position (A) by extending the lower surface board of a fireproof coating material to a horizontal direction. With this configuration, even if a flame or the like enters the fireproof coating structure from the joint portion of the second fireproof coating material (10), further penetration of the flame into the inside can be prevented. In addition, the seam of the non-land conditioner (9) made of a ceramic base material and the fireproof coating material and the joints of the fireproof coating materials were sealed using a silicone sealing agent. Moreover, as a 2nd fireproof covering material (10), a calcium silicate board is used, The material and thickness are the same as the calcium silicate board (8) of the said fireproof covering material .
Finally, the second refractory coating material (10) was fixed to the ALC plate (1) using the mounting brackets (13) at predetermined intervals in the length direction. In this embodiment, a ceramic wool felt (15) having a thickness of 6 mm is used on the inner side of the mounting bracket (13).
In addition, the dimension of the height direction of the cross section of the obtained fireproof coating structure was 310 mm, and the dimension of the horizontal direction was 445 mm.

Both ends of the test piece of the fireproof coating structure of the cable conduit in the tunnel having the above-described configuration are sealed with a fireproof material, and the end of the FRP cable conduit (2a to 2h) is also filled with felt made of ceramic wool. After that, a central portion 890 mm in the length direction of the test specimen was installed in a small horizontal furnace from above, and the temperature was raised from room temperature to 1200 ° C. in the first 5 minutes according to the RABT curve shown in FIG. After that, it was cooled linearly and then cooled to room temperature 170 minutes after the start of heating. FIG. 3 shows temperature data measured by the thermocouple attached to the surface of the optical cable (3) and the electric cable (4) at the center in the length direction in the FRP cable conduits (2a to 2h) at this time. did. As is clear from the data in FIG. 3, the maximum temperature of the cable surface is 57 ° C. (in the FRP cable conduit (2h)), and the fireproof covering structure of the cable conduit in the tunnel of the present invention has sufficient fire resistance. -It has heat insulation performance.
When the inside of the refractory coating structure was investigated after the heating test was completed, it was observed that the individual cells of the endothermic pack layer in the zone heated in the small horizontal furnace were damaged.

  In the embodiment shown in FIG. 1, the mounting bracket (13) is directly fixed to the ALC plate (1) with bolts and nuts. However, as shown in FIG. The mounting bracket (13) can be fixed to the ALC plate (1) through the unevenness adjusting member (9) by extending to the end of the bracket (13). Moreover, as shown in FIG. 5, the fireproof covering structure of this invention can also be constructed | assembled on the lower surface of ALC board (1), without using attachment bracket (13). In addition, in the embodiment shown in FIG.4 and 5, the example which uses the laminated body of the calcium silicate board (16) and the ceramic wool blanket (14) is shown as a non-land surface adjustment material (9).

  The fireproof coating structure of the cable conduit in the tunnel of the present invention has a very excellent fireproof and heat insulation performance and can be installed by simple construction, as well as a new tunnel as well as the existing cable conduit in the tunnel. It can be suitably employed as a fireproof coating structure.

1 shows a fireproof covering structure for a cable line in a tunnel according to an embodiment of the present invention. It is a graph which shows a RABT curve. It is a graph which shows the data of the temperature change of the cable surface in a cable pipe when the test body of the fireproof coating structure of the cable pipe in a tunnel which is an Example of this invention is heated. It shows the fireproof covering structure of the cable conduit in the tunnel which is another embodiment of the present invention. 6 shows a fireproof coating structure for a cable line in a tunnel which is still another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ALC board 2a-2h FRP cable conduit 3 Optical cable 4 Electric cable 5 Glass wool 6 Aluminum foil layer 7 Endothermic pack layer 8 Calcium silicate board layer 9 Non-land surface adjustment material 10 Second fireproof covering material 11 Spacer 13 Mounting bracket 14 Ceramic Wool blanket 15 Ceramic wool felt 16 Calcium silicate board

Claims (6)

Is attached to the tunnel wall, a refractory coating structure of a plurality of assemblies of one or a plurality of cable ducts cable is attached or cable conduit therein, a plurality of cable ducts or cable ducts the outer periphery of the assembly, insulating mat material in which contact with the coating on the outer periphery of the aluminum foil layer is coated in contact, the outer surrounded by the tunnel inner wall and the refractory coating material, the outside of the refractory dressing second refractory further surrounded by a coating material, and the contact portion of the refractory coating material and a second fireproofing material and the tunnel inner wall, uneven surface to prevent a decrease in fire-insulating performance due to gaps between the refractory coating material and the tunnel inner wall by installing the adjustment member, the fire protection structure of a cable conduit having a structure in which plural assemblies of the cable conduit or cable conduit is disconnected from the space in the tunnel There are, the insulating mat material density of Waso is 24~48kg / ^{m 3,} there thickness in the range of 15 to 50 mm, the refractory coating material has a density in 0.8~1.1g / cm ^3, A calcium silicate plate having a thickness of 15 to 50 mm, and an endotherm made of a liquid or gel substance made of water or a polymer impregnated with water in a cell defined between two films. An endothermic pack layer having a water content of 8000 to 10000 g / m ² sealed with a material sealed, the endothermic pack layer facing the aluminum foil layer on the outer periphery of the heat insulating mat material and providing a space is provided as the second refractory coating material is a density of 0.8~1.1g / cm ^3, by Rukoto thickness consists of calcium silicate board which is within the range of 15 to 50 mm, RABT based on the curve Fireproof covering structure of the tunnel in a cable duct, wherein the internal temperature of the cable conduit when subjected to fire tests 60 minutes at 1200 ° C. is less than 85 ° C.. Is attached to the tunnel wall, a refractory coating structure of a plurality of assemblies of one or a plurality of cable ducts cable is attached or cable conduit therein, a plurality of cable ducts or cable ducts If the heat insulating mat material provided with an aluminum foil layer on at least one side is provided on the outer periphery of the assembly, the outer side of the aluminum foil layer is in contact with the outer periphery so that the aluminum foil layer is not in contact with the outer periphery. the surrounded by a tunnel inner wall and the refractory coating material, outside of the refractory coating material is further surrounded by a second refractory coating material, and the contact portion of the refractory coating material and a second fireproofing material and the tunnel inner wall, the refractory coating material and by placing the uneven surface adjustment member for preventing the deterioration of the refractory-insulating performance due to the gap between the tunnel inner wall, a plurality sets of cable ducts or cable ducts In fire protection structure of the cable conduit, the density of the insulating mat material Waso wherein comprising at least one surface of the aluminum foil layer is 24~48kg / m ^3, thickness 15 but which have a structure that is cut off from the space in the tunnel in the range of ～50Mm, the refractory coating material, a density of 0.8~1.1g / cm ^3, a calcium silicate plate having a thickness in the range of 15 to 50 mm, between two films sealing the periphery by sealing endothermic material made of a liquid or gel-like substance consisting of a polymer impregnated with water or water in the cells which are partitioned and formed on an endothermic pack having moisture 8000~10000g / m ² is composed of a layer, its endothermic pack layer is placed so that provided facing vital space and the aluminum foil layer of the heat insulating mat material, the second refractory coating material has a density of 0.8～1.1G / cm ³ The thickness is composed of calcium silicate plates that are within the scope of 15~50mm Rukoto, the internal temperature of the cable conduit when subjected to fire tests 60 minutes based-out 1200 ° C. to RABT curve 85 ° C. A fireproof covering structure for cable pipes in tunnels, characterized by being less than. The calcium silicate plate of the fireproof coating material is that the matrix is composed of tobermorite and zonotlite, and contains 20 to 60% by mass of acicular wollastonite and 1 to 10% by mass of cellulose pulp as fibers. 3. A fireproof covering structure for a cable conduit in a tunnel according to claim 1 or 2 . 4. The fire resistance of a cable conduit in a tunnel according to claim 1, wherein spacers are installed at a predetermined interval between the fireproof covering material and the second fireproof covering material. 5. Covering structure. The fireproof coating structure for a cable line in a tunnel according to claim 4, wherein the spacer is made of a papermaking gypsum board or a calcium silicate board . The in- tunnel cable according to any one of claims 1 to 4 , wherein the unevenness adjusting material is made of a ceramic wool mat or a laminate of a calcium silicate plate and a ceramic wool blanket. Fireproof coating structure for pipelines.

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