Underfloor wiring structure and underfloor wiring method

Abstract

To improve fire resistance performance of underfloor wiring.SOLUTION: An underfloor wiring structure includes a fireproof wall 1AA that is laminated with heat-resistant material 1AAa and insulation material 1AAb in the direction of thickness, is installed standing on a concrete floor 101, and is capable of compartmentalizing cables of a plurality of systems and a heat-resistant shielding material 1AB that closes a gap between an upper floor plate 103 placed on the fireproof wall 1AA and the fireproof wall 1AA by elastic deformation.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an underfloor wiring structure and an underfloor wiring method. [Background technology]

[0002] For example, Patent Documents 1 and 2 describe a double floor structure in which floor panels are installed at regular intervals on the upper surface of a concrete floor, and a duct (groove) partitioned by a partition wall is installed in the internal space of the double floor, and cables for electronic devices installed in the room are placed in the groove. The partition wall is configured as a concrete partition wall formed integrally with the concrete floor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 156204 / 1983 [Patent Document 2] Japanese Patent Application Laid-Open No. 61-101420 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for further improvements in the fire resistance of underfloor wiring.

[0005] The present disclosure is intended to solve the above-mentioned problems, and aims to provide an underfloor wiring structure and an underfloor wiring method that can improve the fire resistance of underfloor wiring. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, an underfloor wiring structure according to one embodiment of the present disclosure comprises a fire-resistant wall in which heat-resistant material and heat-insulating material are stacked in the thickness direction and erected on the floor, and which can separate multiple systems of cables, and a heat-resistant shielding member that elastically deforms to seal the gap between the fire-resistant wall and a cover material placed on top of the fire-resistant wall.

[0007] In order to achieve the above-mentioned object, an underfloor wiring method according to one embodiment of the present disclosure includes the steps of erecting a fire-resistant wall on the floor, the fire-resistant wall being made of heat-resistant material and heat-insulating material laminated in the thickness direction, placing a heat-resistant shielding member on the upper end of the fire-resistant wall, and placing a cover material between the fire-resistant wall and the shielding member so as to elastically deform and sandwich the shielding member. [Effects of the Invention]

[0008] The present disclosure can improve the fire resistance of underfloor wiring. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a configuration diagram of an underfloor wiring structure according to an embodiment. [Figure 2] FIG. 2 is an enlarged configuration diagram of the underfloor wiring structure according to the embodiment. [Figure 3] FIG. 3 is a partial front view of the underfloor wiring structure according to the embodiment. [Figure 4] FIG. 4 is a partial front view of the underfloor wiring structure according to the embodiment. [Figure 5] FIG. 5 is a partial front view of the underfloor wiring structure according to the embodiment. [Figure 6] FIG. 6 is a partial cross-sectional view of the underfloor wiring structure according to the embodiment. [Figure 7] FIG. 7 is a configuration diagram of an intersection of an underfloor wiring structure according to the embodiment. [Figure 8] FIG. 8 is a flowchart of the underfloor wiring method according to the embodiment. [Figure 9] FIG. 9 is a flowchart of the underfloor wiring method according to the embodiment. [Figure 10] FIG. 10 is a configuration diagram of another example of the underfloor wiring structure according to the embodiment. [Figure 11] FIG. 11 is an enlarged configuration diagram of another example of the underfloor wiring structure according to the embodiment. [Figure 12] FIG. 12 is an enlarged front view of another example of the underfloor wiring structure according to the embodiment. [Figure 13]FIG. 13 is a partial cross-sectional view of another example of the underfloor wiring structure according to the embodiment. [Figure 14] FIG. 14 is a configuration diagram of an intersection of another example of the underfloor wiring structure according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to these embodiments. Furthermore, the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially identical.

[0011] [Embodiment 1] Fig. 1 is a configuration diagram of an underfloor wiring structure according to an embodiment, and Fig. 2 is an enlarged configuration diagram of the underfloor wiring structure according to an embodiment.

[0012] As shown in FIG. 1 , an underfloor wiring structure 100 according to an embodiment relates to wiring of cables 51 connected to electronic equipment 50, which is a control panel, in a central control room in a plant facility such as a nuclear power plant. The central control room in the nuclear power plant is surrounded by a sturdy concrete floor (also referred to as the "floor") 101 and, although not shown, concrete walls and a concrete ceiling. The underfloor wiring structure 100 includes a floor section 104, which is an underfloor space, supported by a plurality of support legs 102 fixed to a floor surface 101a of the concrete floor 101 and an upper floor panel 103 spaced a predetermined distance above the floor surface 101a. The cables 51 are routed through the floor section 104. The electronic equipment 50 according to the embodiment is fixed to a concrete base 101b raised above the floor surface 101a of the concrete floor 101 to the same level as the upper floor panel 103. An opening in the base 101b through which the cables 51 pass is sealed with a fire seal 52.

[0013] The cables 51 are required to be separated into systems. For example, the cables 51 include a safety system (cables 51A and 51B) that performs emergency shutdown of the reactor and core cooling in the event of an abnormality, and a normal system (cable 51C) that generates electricity. The safety system cables 51A and 51B are required to be redundant and independent, and are composed of multiple (two in this embodiment) independent trains that are electrically and physically separated. They must be positioned so that a failure in one train does not affect the function of the other trains. Therefore, the underfloor wiring structure 100 of this embodiment separates the safety system cables 51A and 51B from each other to ensure reliability.

[0014] As described above, the underfloor wiring structure 100 includes a fire-resistant compartment member 1 capable of compartmentalizing multiple systems of cables 51 (51A, 51B) that require system separation. As shown in Fig. 2, the fire-resistant compartment member 1 has walls formed of fire-resistant material 1A and support members 1B that support the fire-resistant material 1A. The drawing also shows a first direction X (the height direction of the fire-resistant material 1A), a second direction Y (the thickness direction (width direction) of the fire-resistant material 1A) that is perpendicular to the first direction X and runs along the concrete floor 101, and a third direction Z (the length direction of the fire-resistant material 1A) that is perpendicular to the first direction X and the second direction Y and runs along the concrete floor 101.

[0015] The fire-resistant material 1A has fire resistance. The fire-resistant material 1A of the embodiment partitions the area in the thickness direction, ensuring fire resistance in the thickness direction. The fire-resistant material 1A is installed upright in the height direction on the floor surface 101a of the concrete floor 101 to form a partition wall. The fire-resistant material 1A is installed continuously in the length direction along the floor surface 101a of the concrete floor 101, in the extension direction of the cable 51 to be laid.

[0016] The support member 1B is made of a plate-shaped steel plate and is arranged along at least one side surface of the wall of the fire-resistant material 1A. In FIG. 2, the support member 1B is arranged along both side surfaces of the wall of the fire-resistant material 1A. The support member 1B is composed of a support portion 1Ba that follows the side surface of the wall of the fire-resistant material 1A and a fixing portion 1Bb that is bent continuously from the support portion 1Ba and fixed to the floor surface 101a of the concrete floor 101. The support portion 1Ba is arranged on the side surface of the wall of the fire-resistant material 1A. The fixing portion 1Bb is fixed to the floor surface 101a of the concrete floor 101 by welding to a fixing metal fitting installed on the floor surface 101a of the concrete floor 101 or by fastening to an anchor bolt installed on the concrete floor 101. Thus, the support member 1B supports the fire-resistant material 1A with the support portion 1Ba and fixes the fire-resistant material 1A to the floor surface 101a of the concrete floor 101 with the fixing portion 1Bb.

[0017] The fire-resistant compartment member 1 also includes a reinforcing member 1C as necessary. The reinforcing member 1C supports the fire-resistant material 1A and reinforces its fixation to the floor surface 101a of the concrete floor 101. The reinforcing member 1C is made of a square steel plate formed of steel and has a leg portion 1Ca that is erected and fixed to the floor surface 101a of the concrete floor 101, and a beam portion 1Cb that is provided along the floor surface 101a of the concrete floor 101 and joined to the leg portion 1Ca by welding or the like. The leg portion 1Ca is fixed to the floor surface 101a of the concrete floor 101 by welding to a fixing metal fitting installed on the floor surface 101a of the concrete floor 101 or by fastening to an anchor bolt installed on the concrete floor 101. The leg portion 1Ca is joined to the plate surface of the support member 1B by welding or the like. The beam portion 1Cb is joined to the plate surface of the support member 1B by welding or the like. Furthermore, a plurality of beams 1Cb may be provided along the floor surface 101a of the concrete floor 101. Two beams 1Cb are provided in Fig. 2. Therefore, the reinforcing member 1C reinforces the supporting member 1B that supports the fire-resistant material 1A, thereby improving earthquake resistance.

[0018] Such a fire-resistant compartment member 1 constitutes a compartment wall in which fire-resistant material 1A is erected on the floor surface 101a of the concrete floor 101. The fire-resistant compartment member 1 is installed independently of the support legs 102 so as not to interfere with them. In addition, the upper end of the fire-resistant material 1A that rises from the floor surface 101a of the concrete floor 101 makes contact with the bottom surface of the upper floor board 103 without any gaps.

[0019] As shown in FIG. 1, the above-mentioned fire-resistant compartment members 1 are arranged in pairs on both sides of the route of each safety-system cable 51A, 51B so as to sandwich each cable 51A, 51B, and are continuous in the extension direction of each cable 51A, 51B, thereby separating the systems of each area 10A, 10B in which each safety-system cable 51A, 51B is arranged.

[0020] Here, the fire-resistant material 1A will be described in detail. Fig. 3 is a partial front view of an underfloor wiring structure according to an embodiment. Fig. 4 is a partial front view of an underfloor wiring structure according to an embodiment. Fig. 5 is a partial front view of an underfloor wiring structure according to an embodiment. Fig. 6 is a partial cross-sectional view of an underfloor wiring structure according to an embodiment.

[0021] As shown in FIG. 2, the fireproof material 1A includes a fireproof wall 1AA and a shielding member 1AB.

[0022] The fire-resistant wall 1AA is a fire-resistant material 1A that is installed upright on the floor surface 101a of the concrete floor 101. The fire-resistant wall 1AA includes a heat-resistant material 1AAa and a heat-insulating material 1AAb. The fire-resistant wall 1AA is configured by stacking a layer of the heat-resistant material 1AAa and a layer of the heat-insulating material 1AAb in the thickness direction. In the embodiment, the fire-resistant wall 1AA is configured by disposing one layer of the heat-insulating material 1AAb between two layers of the heat-resistant material 1AAa in the thickness direction. The heat-resistant material 1AAa has a maximum heat-resistant temperature of 1300°C or higher, and Fineflex BIO (registered trademark) is an example of the heat-resistant material 1AAa. The heat-insulating material 1AAb is an insulating material with excellent insulating performance, such as silica nanoparticles. When the maximum use temperature of the insulating material 1AAb is, for example, a temperature that cannot withstand the maximum temperature of 945.3°C in a one-hour fire resistance test, the heat-resistant performance of the fire-resistant wall 1AA is ensured by the heat-resistant material 1AAa. The fire-resistant wall 1AA withstands the one-hour fire resistance test while minimizing the area it occupies. Thus, the fire-resistant wall 1AA of this embodiment is constructed by disposing one layer of heat-insulating material 1AAb between two layers of heat-resistant material 1AAa in the thickness direction, thereby ensuring fire resistance regardless of the direction of fire from which flames reach. Although not explicitly shown in the figures, if it is anticipated that flames will reach only one side in the thickness direction, the fire-resistant wall 1AA may have a two-layer construction with one layer of heat-resistant material 1AAa on one side and one layer of heat-insulating material 1AAb on the other side.

[0023] Shielding member 1AB seals the gap between fire-resistant wall 1AA and upper floor plate 103, which serves as a cover. Shielding member 1AB is heat-resistant, and can be made of, for example, Fineflex BIO (registered trademark). Shielding member 1AB is placed at the top of fire-resistant wall 1AA. When upper floor plate 103 is installed, shielding member 1AB is deformed by compression of compression portion 1AB' (shown in FIGS. 3 to 5 ). Shielding member 1AB adheres closely to fire-resistant wall 1AA and upper floor plate 103 due to its own elasticity. That is, when shielding member 1AB is placed at the top of fire-resistant wall 1AA, its height dimension from floor surface 101a of concrete floor 101, including compression portion 1AB' and fire-resistant wall 1AA, is set to be greater than the height dimension of support leg 102 from floor surface 101a of concrete floor 101. This allows shielding member 1AB to seal the gap between fire-resistant wall 1AA and upper floor plate 103. Therefore, the fire-resistant material 1A is provided so as to seal the gap between the floor surface 101a of the concrete floor 101 and the bottom surface of the upper floor board 103, with the heat insulating material 1AAb of the fire-resistant wall 1AA covered with the heat-resistant material 1AAa and the heat-resistant shielding member 1AB. Therefore, the fire-resistant material 1A can ensure fire resistance that can withstand, for example, a one-hour fire resistance test.

[0024] As shown in Figures 3 and 4, the shielding member 1AB is configured as a separate member from the fire-resistant wall 1AA. When the shielding member 1AB is configured as a separate member from the fire-resistant wall 1AA, it is supported by a support structure 1D. In Figure 3, the support structure 1D is made up of the support member 1B. The support member 1B, which is part of the support structure 1D, is formed so that its height dimension from the floor surface 101a of the concrete floor 101 is larger than that of the fire-resistant wall 1AA and protrudes from the upper end of the fire-resistant wall 1AA. The support member 1B supports the shielding member 1AB installed at the upper end of the fire-resistant wall 1AA by sandwiching the shielding member 1AB in the width direction with this protruding portion. The height dimension of the support member 1B is set so that it does not interfere with the upper floor plate 103 when the upper floor plate 103 is installed. In Figure 4, the support structure 1D is made up of the fire-resistant wall 1AA. The fire-resistant wall 1AA, which is the support structure 1D, is made up of unevenness between the heat-resistant material 1AAa and the heat-insulating material 1AAb, which have different height dimensions from the floor surface 101a of the concrete floor 101. The support member 1B supports the shielding member 1AB installed at the upper end of the fire-resistant wall 1AA by fitting the shielding member 1AB into the unevenness.

[0025] Shielding member 1AB is integrally formed with fire-resistant wall 1AA, as shown in FIG. 5. That is, shielding member 1AB is formed as part of fire-resistant wall 1AA. In fire-resistant wall 1AA, heat-resistant material 1AAa and heat-insulating material 1AAb have different height dimensions from floor surface 101a of concrete floor 101, with heat-resistant material 1AAa being set larger in height than heat-insulating material 1AAb. This heat-resistant material 1AAa, which is set larger in height, constitutes shielding member 1AB. Shielding member 1AB, made of heat-resistant material 1AAa, is deformed by compression of compression portion 1AB' shown in FIG. 5 from above when upper floor plate 103 is installed, and comes into close contact with upper floor plate 103 due to its own elastic force. That is, shielding member 1AB includes compression portion 1AB', and is set so that the height dimension of heat-resistant material 1AAa from floor surface 101a of concrete floor 101 is larger than the height dimension of support leg 102 from floor surface 101a of concrete floor 101. As a result, the shielding member 1AB closes the gap between the fire-resistant wall 1AA and the upper floor board 103.

[0026] As shown in FIG. 6 , the fire-resistant wall 1AA has uneven portions 1E formed in the longitudinal direction along the concrete floor 101, where the layers of the heat-resistant material 1AAa and the insulating material 1AAb of the fire-resistant wall 1AA are offset. The fire-resistant wall 1AA is provided in a continuous manner in the longitudinal direction by fitting together the uneven portions 1E of multiple fire-resistant walls 1AA. Therefore, in the underfloor wiring structure 100 of this embodiment, the layers of the heat-resistant material 1AAa and the insulating material 1AAb are fitted together at the offset uneven portions 1E, which prevents the joints between the heat-resistant materials 1AAa and the insulating materials 1AAb from being aligned at the same position in the longitudinal direction. Furthermore, the fire-resistant wall 1AA is provided such that the longitudinal joints of the support member 1B are offset from the joints of the heat-resistant material 1AAa.

[0027] Fig. 7 is a configuration diagram of an intersection of an underfloor wiring structure according to an embodiment. As shown in Fig. 1, the underfloor wiring structure 100 of the embodiment has an intersection C where the regions 10A, 10B of the safety-system cables 51A, 51B intersect. At this intersection C, the fire-resistant compartment member 1 is configured as shown in Fig. 7. Note that in Fig. 7, the fire-resistant compartment member 1 is shown in a simplified form consisting of only the fire-resistant material 1A. Therefore, the fire-resistant compartment member 1 will be described here as the fire-resistant material 1A.

[0028] A pair of fire-resistant materials 1A that define the region 10A pass below each other at an intersection C. The fire-resistant materials 1A have a notch 11A at the intersection C, where approximately half of the upper side is cut away. The notch 11A is rectangular and is formed in the same position and of the same size in the pair of fire-resistant materials 1A in the intersecting direction (in this embodiment, a direction perpendicular to the fire-resistant materials 1A that define the region 10A). Therefore, the fire-resistant materials 1A that define the region 10A are formed so that their upper sides are penetrated by the notches 11A in the intersecting direction. Each of the notches 11A has a plate-shaped fire-resistant material 11B that is upright and spanned between the vertical sides of the rectangle. Support members 1B are provided for the fire-resistant material 11B as needed. Furthermore, each of the notches 11A has a plate-shaped fire-resistant material 11C that is horizontally spanned between the horizontal sides of the rectangle. Support members 1B are provided for the fire-resistant material 11C as needed. Therefore, the upper part of the through cutout 11A is blocked by the fire-resistant material 11B and the fire-resistant material 11C.

[0029] On the other hand, the pair of fire-resistant materials 1A that define region 10B pass above each other at intersection C. This fire-resistant material 1A is provided at the intersection C, interrupting the pair of fire-resistant materials 1A that define region 10A. A cross member 12 is provided at this interrupted portion. The cross member 12 has a pair of plate-shaped fire-resistant materials 12A that connect the interrupted portions along the crossing direction. This fire-resistant material 12A has a notch 12Aa cut out of approximately half of its lower side at intersection C. The notch 12Aa is a rectangular cutout, and is formed to the same size and at the same position in the direction in which the fire-resistant materials 1A that define region 10A continue in the pair of fire-resistant materials 12A. Therefore, the fire-resistant material 12A is formed so that its lower side is penetrated by the notch 12Aa in the direction in which the fire-resistant materials 1A that define region 10A continue. Further, the notches 12Aa are provided so as to straddle the upper side of the fire-resistant material 11C laid horizontally. In each notch 12Aa, a plate-shaped fire-resistant material 12B is placed upright between the vertical sides of the rectangle. The fire-resistant material 12B is provided with a support member 1B as needed. In addition, in each notch 12Aa, a plate-shaped fire-resistant material 12C is placed horizontally between the horizontal sides of the rectangle. The fire-resistant material 12C is provided with a support member 1B as needed. Therefore, the through notch 12Aa is blocked by the fire-resistant material 12B and the fire-resistant material 12C except for the upper part.

[0030] Then, cable 51A is laid in region 10A below intersection C partitioned by fire-resistant materials 1A, 11B, and 11C. Also, cable 51B is laid in region 10B above intersection C partitioned by fire-resistant materials 12A, 12B, and 12C. Thus, cable 51A and cable 51B cross each other in a system-separated manner.

[0031] 8 and 9 are flowcharts of the underfloor wiring method according to the embodiment.

[0032] As shown in Fig. 8, the underfloor wiring method of the embodiment includes steps S1 to S4. In step S1, a fire-resistant compartment member 1 is attached to a concrete floor 101 inside a nuclear facility. Next, in step S2, cables 51 are arranged (laid) in areas 10A, 10B, and 10C partitioned by the fire-resistant compartment member 1. Next, in step S3, fire detectors 35A, 35B, and 35C and gas fire extinguishing systems 30A, 30B, and 30C are installed in areas 10A, 10B, and 10C. Next, in step S4, an upper floor panel 103 is placed on support legs 102.

[0033] As shown in FIG. 9 , step S1 includes steps S11 to S13, and step S4 includes step S14. In step S11, fire-resistant wall 1AA is erected on concrete floor 101. As described above, fire-resistant wall 1AA is formed by laminating layers of heat-resistant material 1AAa and heat-insulating material 1AAb in the thickness direction. Therefore, in step S11, layers of heat-resistant material 1AAa and heat-insulating material 1AAb are erected on concrete floor 101. Alternatively, in step S11, fire-resistant wall 1AA, in which layers of heat-resistant material 1AAa and heat-insulating material 1AAb are pre-laminate, is erected on concrete floor 101. In step S12, as described above, if fire-resistant wall 1AA has concave-convex portions 1E formed thereon, these concave-convex portions 1E are fitted together to form fire-resistant wall 1AA continuously in the length direction. In the process of step S13, shielding member 1AB is placed on the upper end of fire-resistant wall 1AA. If shielding member 1AB is separate from fire-resistant wall 1AA, shielding member 1AB is placed on the upper end of fire-resistant wall 1AA that is set upright on concrete floor 101. Alternatively, if shielding member 1AB is integrated with fire-resistant wall 1AA, fire-resistant wall 1AA is set upright on concrete floor 101, thereby placing shielding member 1AB on the upper end of fire-resistant wall 1AA. In the process of step S41, upper floor board 103 that is a lid member is placed, that is, upper floor board 103 that is a lid member is placed between concrete floor 101 and fire-resistant wall 1AA so as to sandwich shielding member 1AB.

[0034] In this way, the underfloor wiring structure 100 of the embodiment comprises a fire-resistant wall 1AA in which heat-resistant material 1AAa and heat-insulating material 1AAb are stacked in the thickness direction and set upright on the floor (concrete floor 101), and which can separate multiple systems of cables 51, and a heat-resistant shielding member 1AB that elastically deforms to seal the gap between the fire-resistant wall 1AA and a covering material (upper floor board 103) placed on top of the fire-resistant wall 1AA.

[0035] According to this underfloor wiring structure 100, heat-resistant components are arranged without gaps between the concrete floor 101 and the upper floor board 103, and insulating components are arranged in layers in the thickness direction, thereby improving fire resistance.

[0036] In the underfloor wiring structure 100 of the embodiment, the shielding member 1AB is provided separately from the fire-resistant wall 1AA. According to this underfloor wiring structure 100, the shielding member 1AB absorbs any dimensional error between the fire-resistant wall 1AA and the upper floor board 103, and heat-resistant members can be arranged without gaps between the concrete floor 101 and the upper floor board 103.

[0037] Furthermore, in the underfloor wiring structure 100 of the embodiment, when the shielding member 1AB is provided separately from the fire-resistant wall 1AA, a support structure 1D is provided to support the shielding member 1AB. This underfloor wiring structure 100 makes it easy to arrange the shielding member 1AB relative to the fire-resistant wall 1AA.

[0038] In the underfloor wiring structure 100 of this embodiment, the fire-resistant wall 1AA is formed by disposing a layer of heat-insulating material 1AAb between two layers of heat-resistant material 1AAa in the thickness direction. This underfloor wiring structure 100 can ensure fire resistance against fires on either side of the fire-resistant wall 1AA in the thickness direction.

[0039] Furthermore, in the underfloor wiring structure 100 of this embodiment, the fire-resistant wall 1AA has uneven portions 1E formed in the longitudinal direction along the concrete floor 101, where the layers of heat-resistant material 1AAa and insulating material 1AAb are offset, and multiple uneven portions 1E are fitted together to form a continuous structure in the longitudinal direction. According to this underfloor wiring structure 100, the joints between the heat-resistant materials 1AAa and the joints between the insulating materials 1AAb are positioned at different positions in the longitudinal direction, preventing the joints of the entire fire-resistant wall 1AA from aligning at the same position in the longitudinal direction. As a result, the underfloor wiring structure 100 of this embodiment prevents flames from passing through the longitudinal joints of the fire-resistant wall 1AA, thereby improving fire resistance.

[0040] In addition, the underfloor wiring method of the embodiment includes the steps of erecting a fire-resistant wall 1AA, which is made of heat-resistant material 1AAa and insulating material 1AAb laminated in the thickness direction, on a floor (concrete floor 101), placing a heat-resistant shielding member 1AB on the upper end of the fire-resistant wall 1AA, and placing a cover material (upper floor board 103) between the fire-resistant wall 1AA and the shielding member 1AB so as to elastically deform and sandwich the shielding member 1AB.

[0041] According to this underfloor wiring method, it is possible to install the underfloor wiring structure 100 of the embodiment, which can improve fire resistance performance.

[0042] In addition, the underfloor wiring method of the embodiment further includes a step of forming uneven portions 1E in the fire-resistant wall 1AA in the longitudinal direction along the concrete floor 101, where the layers of heat-resistant material 1AAa and insulating material 1AAb are offset, and fitting the uneven portions 1E of multiple fire-resistant walls 1AA together to form a continuous structure in the longitudinal direction. According to this underfloor wiring method, the joints between the heat-resistant materials 1AAa and the joints between the insulating materials 1AAb are positioned at different positions in the longitudinal direction, preventing the joints from lining up at the same position in the longitudinal direction of the entire fire-resistant wall 1AA. As a result, the underfloor wiring method of the embodiment can prevent flames from passing through the longitudinal joints of the fire-resistant wall 1AA, improving fire resistance.

[0043] [Embodiment 2] Fig. 10 is a configuration diagram of another example of the underfloor wiring structure according to the embodiment. Fig. 11 is an enlarged configuration diagram of another example of the underfloor wiring structure according to the embodiment.

[0044] In the underfloor wiring structure 200 of the embodiment, the same components as those in the underfloor wiring structure 100 described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0045] 10, the underfloor wiring structure 200 of the embodiment includes a floor portion 104 that is an underfloor space. The underfloor wiring structure 200 includes a fire-resistant compartment member 2 that can compartmentalize cables 51 (51A, 51B) that require system separation. As shown in FIG. 11, the fire-resistant compartment member 2 has a pipe portion formed of fire-resistant material 2A and a support member 2B that supports the fire-resistant material 2A. The drawing also shows a first direction X (the thickness direction of the bottom fire-resistant material 2Aa, the height direction of the side fire-resistant material 2Ab, and the thickness direction of the cover fire-resistant material 2Ac), a second direction Y (the width direction of the bottom fire-resistant material 2Aa, the thickness direction of the side fire-resistant material 2Ab, and the width direction of the cover fire-resistant material 2Ac) that is perpendicular to the first direction X and runs along the concrete floor 101, and a third direction Z (the length direction of the bottom fire-resistant material 2Aa, the side fire-resistant material 2Ab, and the cover fire-resistant material 2Ac) that is perpendicular to the first direction X and the second direction Y and runs along the concrete floor 101.

[0046] The fire-resistant material 2A has fire resistance. The fire-resistant material 2A includes a bottom fire-resistant material 2Aa, side fire-resistant materials 2Ab, and a cover fire-resistant material 2Ac. The bottom fire-resistant material 2Aa is placed face down on the floor surface 101a of the concrete floor 101. The bottom fire-resistant material 2Aa separates the fire-resistant material in the height direction, ensuring fire resistance in the height direction. A pair of side fire-resistant materials 2Ab are provided, abutting both ends of the bottom fire-resistant material 2Aa and standing upright on the floor surface 101a of the concrete floor 101, facing each other. The side fire-resistant materials 2Ab separate the fire-resistant material in the thickness direction, ensuring fire resistance in the thickness direction. The cover fire-resistant material 2Ac is provided across the upper ends of each side fire-resistant material 2Ab, facing the bottom fire-resistant material 2Aa. The cover fireproof material 2Ac separates the space in the height direction, ensuring fire resistance in the height direction. This fireproof material 2A forms a rectangular tube with the bottom fireproof material 2Aa, each side fireproof material 2Ab, and the cover fireproof material 2Ac. The fireproof material 2A is provided continuously on the floor surface 101a of the concrete floor 101 along the extension direction of the cable 51 to be laid.

[0047] The support member 2B is made of a steel plate and is arranged to surround the outer periphery of the tube formed by the fire-resistant material 2A. The support member 2B is composed of a fixing portion 2Ba, which is arranged between the bottom fire-resistant material 2Aa of the fire-resistant material 2A and the floor surface 101a of the concrete floor 101, along the outer periphery of the bottom fire-resistant material 2Aa; support portions 2Bb, which bend continuously from both sides of the fixing portion 2Ba and rise up to be arranged along the outer periphery of each side fire-resistant material 2Ab; and a cover portion 2Bc, which is formed separately from the fixing portion 2Ba and support portions 2Bb, is arranged along the outer periphery of the cover fire-resistant material 2Ac, and is joined to the upper end of the support portion 2Bb. The fixing portion 2Ba is attached to the outer periphery of the bottom fire-resistant material 2Aa by adhesive. The fixing portion 2Ba is fixed to the floor surface 101a of the concrete floor 101 by welding to fixing brackets installed on the floor surface 101a of the concrete floor 101 or by fastening to anchor bolts installed on the concrete floor 101. Each support portion 2Bb is disposed on the outer peripheral surface of each side fireproof material 2Ab. The cover portion 2Bc is attached to the outer peripheral surface of the cover fireproof material 2Ac by adhesive and is joined to the upper end of the support portion 2Bb by welding. Therefore, the support member 2B surrounds and supports the outer periphery of the fireproof material 2A, and fixes the fireproof material 2A to the floor surface 101a of the concrete floor 101 by the fixing portion 2Ba.

[0048] Furthermore, like the fire-resistant compartment member 1, the fire-resistant compartment member 2 may be provided with a reinforcing member 1C as necessary.

[0049] In such a fire-resistant compartment member 2, the fire-resistant material 2A forms a cylindrical compartment wall. The fire-resistant compartment member 2 is provided independently of the support leg 102 so as not to interfere with it. It is also preferable that the fire-resistant compartment member 2 does not interfere with the bottom surface of the upper floor board 103.

[0050] As shown in FIG. 10, the above-mentioned fire-resistant compartment member 2 is arranged so that the routes of the safety-system cables 51A, 51B pass through the cylindrical interior of the fire-resistant material 2A, and is continuous with the extension direction of the cables 51A, 51B, thereby separating the systems of the areas 20A, 20B in which the safety-system cables 51A, 51B are arranged.

[0051] Here, the fire-resistant material 2A will be described in detail. Fig. 12 is an enlarged front view of another example of the underfloor wiring structure according to the embodiment. Fig. 13 is a partial cross-sectional view of another example of the underfloor wiring structure according to the embodiment.

[0052] The bottom fireproof material 2Aa of the fireproof material 2A includes a heat-resistant material 2AAa and a thermal insulating material 2AAb. The bottom fireproof material 2Aa is configured by stacking a layer of heat-resistant material 2AAa and a layer of thermal insulating material 2AAb in the height direction. In this embodiment, the fireproof wall 2AA is configured by disposing one layer of thermal insulating material 2AAb between two layers of heat-resistant material 2AAa in the height direction. The heat-resistant material 2AAa is the same as the heat-resistant material 1AAa in embodiment 1. The thermal insulating material 2AAb is the same as the thermal insulating material 1AAb in embodiment 1. Although not shown in the figures, when it is expected that flames will reach the bottom fireproof material 2Aa from only one side in the height direction, the bottom fireproof material 2Aa may have a two-layer configuration with one layer of heat-resistant material 2AAa disposed on one side and one layer of thermal insulating material 2AAb disposed on the other side.

[0053] The side fireproofing material 2Ab of the fireproofing material 2A includes a heat-resistant material 2AAa and a thermal insulating material 2AAb. The side fireproofing material 2Ab is configured by stacking a layer of heat-resistant material 2AAa and a layer of thermal insulating material 2AAb in the thickness direction. In this embodiment, the fireproof wall 2AA is configured by disposing one layer of thermal insulating material 2AAb between two layers of heat-resistant material 2AAa in the thickness direction. The heat-resistant material 2AAa is the same as the heat-resistant material 1AAa in the first embodiment. The thermal insulating material 2AAb is the same as the thermal insulating material 1AAb in the first embodiment. Although not shown in the figure, the side fireproofing material 2Ab may have a two-layer configuration, with one layer of heat-resistant material 2AAa disposed on one side and one layer of thermal insulating material 2AAb disposed on the other side, when it is expected that flames will reach only one side in the height direction. This side fireproofing material 2Ab is used as the fireproof wall 2AA. Furthermore, the side fire-resistant material 2Ab has a portion where the heat-resistant material 2AAa extends in the height direction and is used as a shielding member 2AB.

[0054] The cover fireproof material 2Ac of the fireproof material 2A includes a heat-resistant material 2AAa and a heat insulating material 2AAb. The cover fireproof material 2Ac is formed by stacking a layer of heat-resistant material 2AAa and a layer of heat insulating material 2AAb in the height direction. In this embodiment, the fireproof wall 2AA is formed by disposing one layer of heat insulating material 2AAb between two layers of heat-resistant material 2AAa in the height direction. The heat-resistant material 2AAa is the same as the heat-resistant material 1AAa in the first embodiment. The heat insulating material 2AAb is the same as the heat insulating material 1AAb in the first embodiment. Furthermore, the heat-resistant material 2AAa of the side fire-resistant material 2Ab extends in the height direction, thereby closing the widthwise ends of the cover fire-resistant material 2Ac. That is, the heat-insulating material 2AAb of the cover fire-resistant material 2Ac is covered with the heat-resistant material 2AAa. Although not shown in the figure, if it is expected that flames will reach the cover fire-resistant material 2Ac from only one side in the height direction, the cover fire-resistant material 2Ac may have a two-layer structure with one layer of heat-resistant material 2AAa on one side and one layer of insulating material 2AAb on the other side. This cover fire-resistant material 2Ac is used as a shielding member 2AB.

[0055] The shielding member 2AB seals the gap between the fire-resistant wall 2AA (side fire-resistant material 2Ab) and the lid portion 2Bc, which is a lid material. The shielding member 2AB is placed at the upper end of the fire-resistant wall 2AA. When the lid portion 2Bc is installed, the compression portion 2AB' shown in FIG. 12 is compressed, causing the shielding member 2AB to deform and adhere to the fire-resistant wall 2AA and the lid portion 2Bc due to its own elasticity. The compression portion 2AB' is made up of the shielding member 2AB and the heat-resistant material 2AAa of the fire-resistant wall 2AA (a portion of the heat-resistant material 2AAa of the fire-resistant wall 2AA (side fire-resistant material 2Ab) extended in the height direction). That is, when the shielding member 2AB is placed at the upper end of the fire-resistant wall 2AA, the height dimension of the shielding member 2AB, including the compression portion 2AB' and the fire-resistant wall 2AA, from the floor surface 101a of the concrete floor 101 is set to be greater than the height dimension of the support portion 2Bb from the floor surface 101a of the concrete floor 101. As a result, the shielding member 2AB seals the gap between the fire-resistant wall 2AA and the lid portion 2Bc. Therefore, the fire-resistant material 2A is provided so as to seal the gap between the floor surface 101a of the concrete floor 101 and the bottom surface of the lid portion 2Bc, with the heat-insulating material 2AAb of the fire-resistant wall 2AA and the shielding member 2AB covered with the heat-resistant material 2AAa. Therefore, the fire-resistant material 2A can ensure fire resistance performance that can withstand, for example, a one-hour fire resistance test.

[0056] The shielding member 2AB is constructed separately from the fire-resistant wall 2AA. The shielding member 2AB is supported by a support structure 2D. The support structure 2D is made up of a support portion 2Bb. The support structure 2D is also made up of a portion where the heat-resistant material 2AAa of the fire-resistant wall 2AA (side fire-resistant material 2Ab) extends in the height direction. The support structure 2D supports the shielding member 2AB installed at the upper end of the fire-resistant wall 2AA so as to sandwich the shielding member 2AB in the width direction.

[0057] 13, the fire-resistant material 2A has uneven portions 2E formed by offsetting the layers of heat-resistant material 2AAa and insulating material 2AAb in the longitudinal direction along the concrete floor 101. The fire-resistant material 2A is provided continuously in the longitudinal direction by fitting together the uneven portions 2E. Therefore, in the underfloor wiring structure 200 of this embodiment, the layers of heat-resistant material 2AAa and insulating material 2AAb are fitted together at the offset uneven portions 2E, so that the joints between the heat-resistant material 2AAa and the joints between the insulating material 2AAb are positioned at different positions in the longitudinal direction, preventing the joints of the entire fire-resistant wall 2AA from being aligned at the same position in the longitudinal direction. Furthermore, the fire-resistant material 2A is provided such that the longitudinal joints of the support member 2B are offset from the joints of the heat-resistant material 2AAa.

[0058] Fig. 14 is a configuration diagram of an intersection of another example of an underfloor wiring structure according to an embodiment. As shown in Fig. 10 and Fig. 14, the underfloor wiring structure 200 of the embodiment has an intersection C where the regions 20A, 20B of the safety-system cables 51A, 51B intersect. At the intersection C, the fire-resistant compartment member 2 is configured as shown in Fig. 10 and Fig. 14.

[0059] The fire-resistant compartment member 2 that defines the area 20A passes below at the intersection C. That is, the fire-resistant compartment member 2 is arranged along the floor surface 101a of the concrete floor 101. On the other hand, the fire-resistant compartment member 2 that defines the area 20B passes above at the intersection C. The fire-resistant compartment member 2 is supported by a pier 21 at the bridge portion that spans the upper side of the fire-resistant compartment member 2 that defines the area 20A at the position of the intersection C. The pier 21 has a leg 21A made of a square steel plate formed from steel, which is fixed by welding to a fixing bracket 21B that is fixed to the floor surface 101a of the concrete floor 101 by an anchor 21C. The leg 21A is joined by welding to a fixing portion 2Ba of the support member 2B of the fire-resistant compartment member 2 at the end portion.

[0060] A cable 51A is laid in the fire-resistant partition member 2 that partitions the area 20A. A cable 51B is laid in the fire-resistant partition member 2 that partitions the area 20B. Therefore, the cables 51A and 51B cross each other in a system-separated form.

[0061] The underfloor cabling method of the embodiment is the same as the underfloor cabling method of the first embodiment. As shown in Fig. 8, the underfloor cabling method of the embodiment includes steps S1 to S4. In step S1, a fire-resistant compartment member 2 is attached to a concrete floor 101 in a nuclear facility. Next, in step S2, cables 51 are arranged (laid) in areas 20A, 20B, and 20C partitioned by the fire-resistant compartment member 2. Next, in step S3, fire detectors 35A, 35B, and 35C and gas fire extinguishing systems 30A, 30B, and 30C are installed in areas 20A, 20B, and 20C. Next, in step S4, an upper floor panel 103 is placed on support legs 102.

[0062] As shown in FIG. 9 , step S1 includes steps S11 to S13, and step S4 includes step S14. In step S11, fire-resistant wall 2AA is erected on concrete floor 101. As described above, fire-resistant wall 2AA is formed by laminating a layer of heat-resistant material 2AAa and a layer of insulating material 2AAb in the thickness direction. Therefore, in step S11, a layer of heat-resistant material 2AAa and a layer of insulating material 2AAb are erected on concrete floor 101. Alternatively, in step S11, fire-resistant wall 2AA, in which a layer of heat-resistant material 2AAa and a layer of insulating material 2AAb are pre-laminate, is erected on concrete floor 101. In step S12, as described above, if uneven portions 2E are formed on fire-resistant wall 2AA, these uneven portions 2E are fitted together to provide fire-resistant wall 2AA continuously in the length direction. In the process of step S13, shielding member 2AB is placed on the upper end of fire-resistant wall 2AA. In the process of step S41, lid portion 2Bc, which is a lid material, is placed between concrete floor 101 and fire-resistant wall 2AA so as to sandwich shielding member 2AB.

[0063] In this way, the underfloor wiring structure 200 of the embodiment comprises a fire-resistant wall 2AA in which heat-resistant material 2AAa and heat-insulating material 2AAb are stacked in the thickness direction and set upright on the floor (concrete floor 101), and which can separate multiple systems of cables 51, and a heat-resistant shielding member 2AB that seals the gap between the fire-resistant wall 2AA and a cover material (cover portion 2Bc) placed on top of the fire-resistant wall 2AA by elastic deformation.

[0064] According to this underfloor wiring structure 200, heat-resistant materials are arranged without gaps between the concrete floor 101 and the lid portion 2Bc, and heat-insulating materials are arranged in layers in the thickness direction, thereby improving fire resistance.

[0065] In the underfloor wiring structure 200 of the embodiment, the shielding member 2AB is provided separately from the fire-resistant wall 2AA. According to this underfloor wiring structure 200, the shielding member 2AB absorbs any dimensional error between the fire-resistant wall 2AA and the lid portion 2Bc, and the heat-resistant member can be arranged without any gaps between the concrete floor 101 and the lid portion 2Bc.

[0066] Moreover, the underfloor wiring structure 200 of the embodiment includes a support structure 2D that supports the shielding members 2AB. According to this underfloor wiring structure 200, the shielding members 2AB can be easily arranged relative to the fire-resistant wall 2AA.

[0067] In the underfloor wiring structure 200 of this embodiment, the fire-resistant wall 2AA is formed by disposing a layer of heat-insulating material 2AAb between two layers of heat-resistant material 2AAa in the thickness direction. This underfloor wiring structure 200 can ensure fire resistance against fires on either side of the fire-resistant wall 2AA in the thickness direction.

[0068] Furthermore, in the underfloor wiring structure 200 of this embodiment, the fire-resistant wall 2AA has uneven portions 2E formed in the longitudinal direction along the concrete floor 101, where the layers of heat-resistant material 2AAa and insulating material 2AAb are offset, and multiple uneven portions 2E are fitted together to form a continuous structure in the longitudinal direction. According to this underfloor wiring structure 200, the joints between the heat-resistant materials 2AAa and the joints between the insulating materials 2AAb are positioned at different positions in the longitudinal direction, preventing the joints of the entire fire-resistant wall 2AA from coinciding at the same position in the longitudinal direction. As a result, the underfloor wiring structure 200 of this embodiment prevents flames from passing through the longitudinal joints of the fire-resistant wall 2AA, thereby improving fire resistance.

[0069] In addition, the underfloor wiring method of the embodiment includes the steps of erecting a fire-resistant wall 2AA, which is made of heat-resistant material 2AAa and heat-insulating material 2AAb laminated in the thickness direction, on a floor (concrete floor 101), placing a heat-resistant shielding member 2AB on the upper end of the fire-resistant wall 2AA, and placing a lid material (lid portion 2Bc) between the fire-resistant wall 2AA and the shielding member 2AB so as to elastically deform and sandwich the shielding member 2AB.

[0070] According to this underfloor wiring method, it is possible to install an underfloor wiring structure 200 of an embodiment that can improve fire resistance.

[0071] In addition, the underfloor cabling method of the embodiment further includes a step of forming uneven portions 2E in the fire-resistant walls 2AA in the longitudinal direction along the concrete floor 101, where the layers of heat-resistant material 2AAa and insulating material 2AAb are offset, and fitting the uneven portions 2E of multiple fire-resistant walls 2AA together to form a continuous structure in the longitudinal direction. According to this underfloor cabling method, the joints between the heat-resistant materials 2AAa and the joints between the insulating materials 2AAb are positioned at different positions in the longitudinal direction, preventing the joints of the entire fire-resistant wall 2AA from coinciding at the same position in the longitudinal direction. As a result, the underfloor cabling method of the embodiment can prevent flames from passing through the longitudinal joints of the fire-resistant walls 2AA, improving fire resistance.

[0072] As shown in Figures 1 and 10, the underfloor wiring structure 100 (200) of the above-mentioned embodiments 1 and 2 has gas fire extinguishing equipment 30A, 30B, 30C and fire detectors 35A, 35B, 35C in areas 10A (20A), 10B (20B), 10C (20C) partitioned by fire-resistant partition members 1 (2) inside the floor section 104.

[0073] The gas fire extinguishing systems 30A, 30B, and 30C each include an extinguishing gas storage container 31A, 31B, or 31C, a tube 32A, 32B, or 32C, and an injection head 33A, 33B, or 33C. The extinguishing gas storage containers 31A, 31B, and 31C store extinguishing gas. The extinguishing gas storage containers 31A, 31B, and 31C are connected to tubes 32A, 32B, and 32C. The tubes 32A, 32B, and 32C extend to predetermined locations in the respective regions 10A (20A), 10B (20B), and 10C (20C), and injection heads 33A, 33B, and 33C are provided at the ends of the tubes. The tubes 32A, 32B, and 32C are branched into a plurality of parts in the respective regions 10A (20A), 10B (20B), and 10C (20C), and ejection heads 33A, 33B, and 33C are provided at the ends of the branched parts.

[0074] The fire detectors 35A, 35B, and 35C include fire detection sensors. The fire detectors 35A, 35B, and 35C detect fires by detecting smoke and heat. A plurality of the fire detectors 35A, 35B, and 35C can be installed at predetermined locations in each of the areas 10A (20A), 10B (20B), and 10C (20C).

[0075] Then, a control device (not shown) that receives detection signals from fire detectors 35A, 35B, and 35C injects the extinguishing gas from extinguishing gas storage containers 31A, 31B, and 31C of gas fire extinguishing equipment 30A, 30B, and 30C from injection heads 33A, 33B, and 33C via tubes 32A, 32B, and 32C.

[0076] In the above-mentioned embodiments 1 and 2, the underfloor wiring structure 100 (200) comprises a floor section 104 in which an upper floor plate 103 is arranged at an interval above a concrete floor 101 in a nuclear facility, a fire-resistant compartmentation member 1 (2) attached to the concrete floor 101 and provided inside the floor section 104, which is composed of fire-resistant material 1A (2A) and a support member 1B (2B) that supports the fire-resistant material 1A (2A) and is capable of compartmentalizing multiple systems of cables 51, and fire detectors 35A, 35B, 35C and gas fire extinguishing equipment 30A, 30B, 30C provided in areas 10A, 10B, 10C (20A, 20B, 20C) partitioned by the fire-resistant compartmentation member 1 (2) inside the floor section 104.

[0077] According to this underfloor wiring structure 100 (200), although conventionally compartments were separated using concrete, by using fire-resistant compartment members 1 (2) consisting of fire-resistant material 1A (2A) and support members 1B (2B) for compartment separation, installation and removal are easy and it has expandability for future cable route changes. Moreover, according to this underfloor wiring structure 100 (200), fire detectors 35A, 35B, 35C and gas fire extinguishing systems 30A, 30B, 30C can be used to take fire extinguishing measures according to the compartment separation by the fire-resistant compartment members 1 (2).

[0078] In the underfloor wiring structure 100 of the first embodiment, the fire-resistant compartment member 1 forms a wall portion in which at least one side of the fire-resistant material 1A is supported by a plate-like support member 1B fixed to the concrete floor 101.

[0079] According to this underfloor wiring structure 100, the wall structure can reduce the amount of material that constitutes the compartment separation.

[0080] In addition, in the underfloor wiring structure 200 of embodiment 2, the fire-resistant compartment member 2 is formed by a tubular fire-resistant material 2A supported inside a tubular support member 2B fixed to the concrete floor 101, forming a pipe portion through which the cable 51 is passed.

[0081] According to this underfloor wiring structure 200, the pipe structure ensures separation of the compartments.

[0082] Moreover, the underfloor wiring structure 100 (200) of the first and second embodiments further includes a reinforcing member 1C attached to the outside of the fire-resistant compartment member 1 (2) and joined to the concrete floor 101.

[0083] According to this underfloor wiring structure 100 (200), the earthquake resistance of the fire-resistant compartment member 1 (2) can be improved by the reinforcing member 1C.

[0084] In the underfloor wiring structure 100 (200) of the first and second embodiments, the cable 51 includes a safety system and a normal system, and the fire-resistant partition member 1 (2) separates the multiple safety systems.

[0085] According to this underfloor wiring structure 100 (200), the safety system cables 51A, 51B can be completely separated and arranged so that a failure in one safety system cable does not affect the function of the other safety system cable.

[0086] In addition, in the underfloor wiring structure 100 (200) of embodiments 1 and 2, an upper floor board 103 is arranged at a distance above the concrete floor 101, and support legs 102 are provided that are fixed to the concrete floor 101 and support the upper floor board 103, and the fire-resistant compartment member 1 (2) is provided independently of the support legs 102.

[0087] According to this underfloor wiring structure 100 (200), the structure of the floor section 104 and the fire-resistant compartment member 1 (2) are independent, so that the fire-resistant compartment member 1 (2) can be installed and removed without changing the design of the floor section 104, for example.

[0088] In addition, the underfloor wiring method of embodiments 1 and 2 includes the steps of attaching a fire-resistant partition member 1(2) to a concrete floor 101 in a nuclear facility, the fire-resistant partition member 1(2) being composed of a fire-resistant material 1A(2A) and a support member 1B(2B) that supports the fire-resistant material 1A(2A) and capable of partitioning cables 51 that require system separation; arranging the cables 51 in areas 10A, 10B, 10C (20A, 20B, 20C) partitioned by the fire-resistant partition member 1(2); and arranging an upper floor board 103 at a distance above the concrete floor 101 so as to cover the fire-resistant partition member 1(2) and the cables 51.

[0089] According to this underfloor wiring method, while conventionally compartments were separated using concrete, by using fire-resistant compartment members 1 (2) consisting of fire-resistant material 1A (2A) and support members 1B (2B) for compartment separation, installation and removal can be easily carried out and the method has scalability for future cable route changes.

[0090] The underfloor wiring structures 100 and 200 of the first and second embodiments are not limited to nuclear power plants, but can also be applied to plant facilities such as thermal power plants and chemical plants, and buildings other than plant facilities (for example, laboratories and offices).

[0091] The present disclosure includes the following inventions. [Invention 1] a fireproof wall that is made of a heat-resistant material and a heat-insulating material stacked in the thickness direction and that is erected on the floor and that can separate multiple cable systems; a heat-resistant shielding member that seals the gap between the cover material and the fire-resistant wall by elastic deformation and is placed on the fire-resistant wall; An underfloor wiring structure equipped with: [Invention 2] The underfloor wiring structure according to invention 1, wherein the shielding member is provided separately from the fire-resistant wall. [Invention 3] The underfloor wiring structure according to invention 2, further comprising a support structure for supporting the shielding member. [Invention 4] 4. The underfloor wiring structure according to any one of inventions 1 to 3, wherein the fire-resistant wall is formed by disposing a layer of heat insulating material between two layers of heat-resistant material in the thickness direction. [Invention 5] The underfloor wiring structure according to any one of Inventions 1 to 4, wherein the fire-resistant wall has uneven portions formed in the longitudinal direction along the floor, where the layers of the heat-resistant material and the insulating material are offset, and multiple fire-resistant walls are arranged continuously in the longitudinal direction by fitting together the uneven portions. [Invention 6] An upper floor plate is arranged above the floor at a distance, 6. The underfloor wiring structure according to any one of claims 1 to 5, wherein the shielding member is provided between the cover material formed by the upper floor board and the fire-resistant wall. [Invention 7] Each side fireproof material constituting the fireproof wall is provided upright on the floor and opposite to each other; a bottom refractory material formed by stacking a heat-resistant material and a heat insulating material in a thickness direction and disposed face down on the floor surface between the side refractory materials; a cover refractory material formed by stacking a heat-resistant material and a heat insulating material in a thickness direction, the cover refractory material being bridged over the upper ends of the side refractory materials and being provided opposite the bottom refractory material; The cable is passed through a cylindrical interior configured by 6. The underfloor wiring structure according to any one of inventions 1 to 5, wherein the cover fireproof material constitutes the shielding member that seals the gap between the cover material and each of the side fireproof materials by elastic deformation. [Invention 8] An upper floor plate is arranged above the floor at a distance, support legs are provided that are fixed to the floor and support the upper floor plate; The underfloor wiring structure according to any one of Inventions 1 to 7, wherein the fire-resistant wall is provided independently of the support legs. [Invention 9] The underfloor wiring structure according to any one of inventions 1 to 8, wherein the cables include a safety system and a normal system, and the fire-resistant wall separates the plurality of safety systems. [Invention 10] a step of erecting a fireproof wall on a floor, the fireproof wall having heat-resistant material and heat insulating material laminated in the thickness direction; placing a heat-resistant shielding member on an upper end of the fire-resistant wall; a step of placing a cover material between the cover material and the fire-resistant wall so as to sandwich the shielding member by elastically deforming the cover material; An underfloor wiring method, including: [Invention 11] The underfloor wiring method according to Invention 10, further comprising a step of forming uneven portions in the fire-resistant wall in the longitudinal direction along the floor, where the layers of the heat-resistant material and the heat-insulating material are misaligned, and fitting the uneven portions of a plurality of the fire-resistant walls together to provide a continuous structure in the longitudinal direction. [Explanation of symbols]

[0092] 1AA fireproof wall 1AAa heat resistant material 1AAb insulation 1AB Shielding material 1D support structure 1E Uneven part 2AA fireproof wall 2AAa heat resistant material 2AAb insulation 2AB Shielding material 2Bc Lid (lid material) 2D support structure 2E Uneven part 100,200 Underfloor wiring structure 101 Concrete floor (floor) 103 Upper floor board (lid material)

Claims

1. A fire-resistant wall made of heat-resistant and heat-insulating materials stacked in the thickness direction and erected on the floor, capable of separating multiple cable systems; a heat-resistant shielding member that seals the gap between the cover material and the fire-resistant wall by elastic deformation and is placed on the fire-resistant wall; Equipped with The fire-resistant wall has uneven portions formed in the longitudinal direction along the floor where the layers of heat-resistant material and insulating material are offset, and multiple fire-resistant walls are installed continuously in the longitudinal direction by fitting together the uneven portions.

2. A fire-resistant wall made of heat-resistant material and heat-insulating material stacked in the thickness direction and erected on the floor, capable of separating multiple cable systems; a heat-resistant shielding member that seals the gap between the cover material and the fire-resistant wall by elastic deformation and is placed on the fire-resistant wall; Equipped with Each side fireproof material constituting the fireproof wall is provided upright on the floor and opposite to each other; a bottom refractory material formed by stacking a heat-resistant material and a heat insulating material in a thickness direction and disposed face down on the floor surface between the side refractory materials; a cover refractory material formed by stacking a heat-resistant material and a heat insulating material in a thickness direction, the cover refractory material being bridged over the upper ends of the side refractory materials and being provided opposite the bottom refractory material; The cable is passed through a cylindrical interior configured by An underfloor wiring structure, wherein the cover fireproof material constitutes the shielding member that seals the gap between the cover material and each of the side fireproof materials by elastic deformation.

3. The underfloor wiring structure according to claim 1 or 2, wherein the shielding member is provided separately from the fire-resistant wall.

4. The underfloor wiring structure according to claim 3 , further comprising a support structure for supporting the shielding member.

5. 3. The underfloor wiring structure according to claim 1, wherein the fire-resistant wall is formed by disposing a layer of heat insulating material between two layers of the heat-resistant material in the thickness direction.

6. An upper floor plate is arranged above the floor at a distance, The underfloor wiring structure according to claim 1 or 2, wherein the shielding member is provided between the cover material formed by the upper floor board and the fire-resistant wall.

7. An upper floor plate is arranged above the floor at a distance, support legs are provided that are fixed to the floor and support the upper floor plate; 3. The underfloor wiring structure according to claim 1, wherein the fire-resistant wall is provided independently of the support legs.

8. 3. The underfloor wiring structure according to claim 1, wherein the cables include a safety system and a normal system, and the fire-resistant wall separates the plurality of safety systems.

9. A process of erecting a fire-resistant wall on a floor, the fire-resistant wall having heat-resistant material and heat-insulating material laminated in the thickness direction; placing a heat-resistant shielding member on an upper end of the fire-resistant wall; a step of placing a cover material between the cover material and the fire-resistant wall so as to sandwich the shielding member by elastically deforming the cover material; Including, The underfloor wiring method further includes a step in which the fire-resistant wall has uneven portions formed in the longitudinal direction along the floor, where the layers of the heat-resistant material and the insulating material are offset, and the uneven portions of multiple fire-resistant walls are fitted together to form a continuous structure in the longitudinal direction.

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