JP6247986B2 - Fire prevention plate, wiring structure and wiring structure construction method - Google Patents

Description

  The present invention relates to a fire prevention plate, a wiring structure, and a wiring structure construction method used for a power supply box or the like provided on a wall.

  It is necessary to prevent a part of a wall part constituting a structure, particularly a building of a certain size or more, from spreading to other sections when a fire occurs on one side of the wall part. For this reason, a fire prevention member etc. are used for a wall part.

  On the other hand, a wiring box or the like may be attached to the wall portion. In this case, it is necessary to form a through hole in the wall portion and perform wiring or the like. When such a wiring box or the like is provided in this through hole, it is necessary to prevent the fire from spreading to other sections through the wiring in the event of a fire. For this reason, it is necessary to perform a fire prevention treatment on the through hole.

  Various methods have been proposed for such a fireproofing method. For example, there is a method of closing a hole through which the wiring is inserted with a putty or the like.

  There is also a method of attaching to a wiring box or the like using a thermally expandable cover (Patent Document 1).

JP 2006-254571 A

  However, in the conventional putty method, the putty may fall when the wiring is routed. However, filling the putty in the entire wiring box increases the amount of putty used and is wasteful.

  On the other hand, since patent document 1 uses a thermally expansible cover, it can block | close front surfaces, such as a wiring box. However, the heat-expandable cover is not strong, and there is a possibility that the heat-expandable cover may be bent, bent, or torn when an electric wire is inserted into the heat-expandable cover for wiring. Also, there is a risk of falling off easily during wiring.

  Moreover, it is necessary to insert an electric wire beforehand in such a cover. For this reason, workability | operativity at the time of attaching a cover is bad, and a response | compatibility is difficult also when adding an electric wire later.

  This invention is made | formed in view of such a subject, and it aims at providing the fireproof cover etc. which are excellent in workability and can ensure fireproof property reliably.

In order to achieve the above-described object, the first invention is a fire prevention plate used for a through hole for a wiring box formed on a wall, and includes a thermal expansion member, a holding fitting for holding the thermal expansion member, And the holding metal fitting includes a claw part that can be fixed to a wiring box, and a holding part that holds the thermal expansion member, and the thermal expansion member has a hole for wiring, the hole, removably inserted and thermal expansion lid is fitted, a fire plate, wherein Rukoto are formed slits between the outer peripheral portion of the hole and the thermal expansion member.

2nd invention is a fire prevention plate used for the through-hole for wiring boxes formed in the wall, Comprising: A thermal expansion member and the holding metal fitting which hold | maintains the said thermal expansion member, The said holding metal fitting is A claw portion that can be fixed to the wiring box; and a holding portion that holds the thermal expansion member. The thermal expansion member has a wiring hole formed therein, and the hole can be inserted and removed. An expansion lid member is fitted, a notch is formed between the hole and the outer peripheral portion of the thermal expansion member, and the holding fitting has a frame portion capable of holding the vicinity of the edge of the thermal expansion member. And the said frame part is a fire prevention plate characterized by being partly cut | disconnected and not continuing cyclically | annularly .

3rd invention is a fire prevention plate used for the through-hole for wiring boxes formed in the wall, Comprising: A thermal expansion member and the holding metal fitting which hold | maintains the said thermal expansion member, The said holding metal fitting is A claw portion that can be fixed to the wiring box; and a holding portion that holds the thermal expansion member. The thermal expansion member has a wiring hole formed therein, and the hole can be inserted and removed. An expansion lid member is fitted, a notch is formed between the hole and the outer peripheral portion of the thermal expansion member, and the holding fitting has a frame portion capable of holding the vicinity of the edge of the thermal expansion member. However, the frame portion is partially cut off and is not continuous in an annular shape , a protruding piece is formed on the outer peripheral portion of the frame portion, and a base portion of the protruding piece is connected to the frame portion. groove to be cut portion is formed is a fire plate, wherein Rukoto.

4th invention is a fire prevention plate used for the through-hole for wiring boxes formed in the wall, It comprises a thermal expansion member and a holding fixture holding the thermal expansion member, The holding fixture is the following. A claw portion that can be fixed to the wiring box; and a holding portion that holds the thermal expansion member. The thermal expansion member has a wiring hole formed therein, and the hole can be inserted into and removed from the thermal expansion member. A lid member is fitted, a notch is formed between the hole and the outer peripheral portion of the thermal expansion member, and the claw portion and the holding portion are formed in opposite directions on both sides of the holding fitting. the retaining brackets are in a state of being fixed to the wiring box, the thermal expansion member, a fire plate, characterized in holdable der Rukoto outside of the wiring box.

5th invention is a fire prevention plate used for the through-hole for wiring boxes formed in the wall, and comprises a thermal expansion member and a holding metal fitting holding the thermal expansion member, and the holding metal fittings are: A claw portion that can be fixed to the wiring box; and a holding portion that holds the thermal expansion member. The thermal expansion member has a wiring hole formed therein, and the hole can be inserted into and removed from the thermal expansion member. A lid member is fitted, a notch is formed between the hole and the outer peripheral portion of the thermal expansion member, and the claw portion and the holding portion are formed in the same direction of the holding fitting, and the holding fitting, in a state of being fixed to the wiring box, the thermal expansion member, a fire plate, characterized in holdable der Rukoto inside the wiring box.

  According to the first invention, since the thermal expansion member is fixed to the metal holding metal fitting, the strength is high, and it is possible to prevent the thermal expansion member from falling off due to deformation during operation. Moreover, since it has a nail | claw part, a fire prevention plate can be easily fixed to a wiring box. For this reason, it is excellent in attachment workability.

  Further, by forming a hole in the thermal expansion member and inserting a lid material into the hole, the electric wire can be inserted only into the hole to be used, and the unused hole can be closed. Moreover, the electric wire can be penetrated to a hole from the side of a thermal expansion member by making the notch connected to an outer peripheral part in the hole.

In addition, according to the second invention, since the frame portion constituting the holding metal fitting is not connected in an annular shape and an opening is formed in a part thereof, even when the thermal expansion member is fixed to the holding metal fitting, The electric wire can be easily fitted into the hole from one side.

Moreover, according to 3rd invention, it can suppress that a fire prevention plate shakes by contact with a wiring box by forming a protrusion piece in the outer peripheral part of a frame part. Furthermore, the projecting piece can be easily excised by forming a groove portion that forms an excision with the frame portion at the base of the projecting piece. For this reason, according to the size of a through-hole, the size adjustment of a fire prevention plate can be easily performed on the spot.

According to the fourth invention, the thermal expansion member can be disposed outside the wiring box by disposing the holding unit that holds the thermal expansion member on the side opposite to the claw portion. For this reason, it can be set as arrangement | positioning of the thermal expansion member suitable for one wall.

Moreover, according to 5th invention , a thermal expansion member can be arrange | positioned inside a wiring box by arrange | positioning the holding | maintenance part holding a thermal expansion member on the same side as a nail | claw part. For this reason, it can be set as arrangement | positioning of the thermal expansion member suitable for a hollow wall.

6th invention is the wiring structure formed in the wall using the fire prevention plate in any one of 1st to 5th invention , Comprising: A wiring box, The fire prevention plate attached to the said wiring box, And an outlet member or a switch member fixed to the front surface of the fire prevention plate, and the fire prevention plate has a wiring structure in which wiring is disposed through the thermal expansion member. .

7th invention is the construction method which forms a wiring structure in the wall using the fire prevention plate in any one of 1st to 5th invention, Comprising: Wiring is carried out to the back side of the through-hole formed in the wall. A step of fixing a box, a step of connecting a wiring and an outlet member or a switch member, a step of fixing the holding metal fitting to the wiring box, and the thermal expansion member cut out in shape according to the through hole. A wiring structure construction method comprising: a step of fixing to the holding metal fitting; and a step of fixing the outlet member or the switch member to the front surface of the fire prevention plate.

According to the sixth and seventh inventions, it is possible to obtain a wiring structure that is excellent in workability and can reliably ensure fireproof performance.

  ADVANTAGE OF THE INVENTION According to this invention, the fireproof cover etc. which are excellent in workability | operativity and can ensure fireproof property reliably can be provided.

The exploded perspective view of fire prevention plates 1 grade. (A) is a perspective view of the holding | maintenance metal fitting 5, (b) is a perspective view of the fire prevention plate 1. FIG. It is sectional drawing of the fire prevention plate 1, and is AA sectional view taken on the line of FIG. The front view of the state which fixed the fire prevention plate 1. FIG. FIG. 6 is a cross-sectional view of the wiring structure 33, and is a cross-sectional view taken along line BB in FIG. The exploded perspective view of fire prevention plates 1a etc. (A) is a perspective view of the holding | maintenance metal fitting 5a, (b) is a perspective view of the fire prevention plate 1a. It is sectional drawing of the fire prevention plate 1a, and is CC sectional view taken on the line of FIG. Sectional drawing of the wiring structure 33a.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is an exploded perspective view of a fire prevention plate 1 and the like constituting a wiring structure according to the present invention. The wiring structure of the present invention includes a wiring box 7, a fire prevention plate 1 and the like. In addition, illustration of an electric wire etc. is abbreviate | omitted in the following figures.

  The wiring box 7 is a steel member and has a front surface opened. A fixing portion 23 is provided at the front edge of the wiring box 7. The fixing part 23 is a part to which an outlet member or a switch member described later is fixed.

  The fire prevention plate 1 includes a thermal expansion member 3, a holding metal fitting 5, and the like. FIG. 2A is a perspective view of the holding metal fitting 5. The holding metal fitting 5 is a metal member and is composed of a substantially rectangular frame portion 13. The frame portion 13 is partially cut and is not a continuous ring. That is, the opening 27 is provided on one side.

  On the outer peripheral portion (near the four corners) of the frame portion 13, a protruding piece that can contact the front surface of the wiring box 7 is provided. A groove 14 is provided at the base of the protruding piece. The groove 14 is provided so as to divide the protruding piece from other parts. In addition, the groove | channel 14 may be formed only in one surface and may be formed in both surfaces. Moreover, the groove | channel 14 may be formed in the surface and may be formed in a back surface. The groove 14 is a thin-walled portion as compared with other portions. For this reason, for example, only the protruding piece can be easily excised with pliers or the like.

  The claw portion 9 is provided toward one surface direction (back side) of the frame portion 13. The claw part 9 is a part fixed to the fixing part 23 of the wiring box 7. A pair of claw portions 9 is formed on the upper and lower sides of the frame portion 13. The nail | claw part 9 is a pair of spring part (refer FIG. 3) bent toward an outer side (up-down direction in the figure), respectively, and is fixed to the fixing | fixed part 23 by elastic deformation. When the holding metal fitting 5 is fixed to the wiring box 7, the holding metal fitting 5 can be positioned in the vertical direction of the wiring box 7 by fitting the upper and lower claw portions 9 to the fixing portions 23.

  The fixing part 23 is usually arcuate. That is, as for the protrusion margin to the center of the height direction of the fixing | fixed part 23, the center part of the width direction is the longest, and the protrusion margin to a center direction becomes short gradually as it goes to both sides. Each of the upper and lower claw portions 9 is composed of a pair of spring portions so as to sandwich the center in the width direction of the holding metal fitting 5. That is, the claw portion 9 includes a pair of spring portions that are separated in the width direction of the holding metal fitting 5.

  When the holding metal fitting 5 is fixed to the wiring box 7, the upper and lower claw portions 9 are positioned so as to be sandwiched from both sides of the arcuate central portion of the fixing portion 23. That is, the claw portion 9 sandwiches the arc-shaped central portion. For this reason, the holding metal fitting 5 does not shift in the width direction of the wiring box 7.

  The holding part 11 is provided toward the opposite side (front side) of the frame part 13 to the side where the claw part 9 is provided. The holding portion 11 is formed at four locations near the four corners of the frame portion 13. The holding part 11 is a part that holds the thermal expansion member 3.

  The holding part 11 has a shape with a slightly sharp tip. For this reason, the thermal expansion member 3 can be easily pierced. In addition, although the holding | maintenance part 11 may be formed perpendicularly | vertically with respect to the frame part 13, you may form it inclining a little inside or outside. If it does in this way, since the opposing holding | maintenance parts 11 are formed in the state which spreads ahead or has been dented, the thermal expansion member 3 becomes difficult to drop out.

  FIG. 2B is a diagram showing a state in which the thermal expansion member 3 is fixed to the holding metal fitting 5. As described above, the thermal expansion member 3 is fixed to the holding metal fitting 5 by inserting the holding portion 11 of the holding metal fitting 5 into the thermal expansion member 3 on the front surface side of the holding metal fitting 5.

  FIG. 3 is a cross-sectional view of the fire prevention plate 1 and is a cross-sectional view taken along line AA in FIG. As described above, the holding portion 11 is pierced into the thermal expansion member 3. For this reason, the thermal expansion member 3 can be easily detached from the holding metal fitting 5. Note that the height of the holding portion 11 is preferably slightly lower than the thickness of the thermal expansion member 3.

  As shown in FIG. 2B, a plurality of holes 15 are formed in the thermal expansion member 3. The hole 15 is a part through which the electric wire is inserted. For this reason, the frame portion 13 of the holding metal fitting 5 does not overlap the portion where the hole 15 is formed. The shape of the hole 15 is not limited to a circle but may be other shapes. Further, the holes 15 may not be formed in two rows but only in one row. In this case, the shape of the hole 15 may be a long hole in the width direction.

  A thermal expansion lid member 17 is inserted into the hole 15. The thermal expansion lid member 17 can be inserted into and removed from the hole 15. The thermal expansion member 3 and the thermal expansion lid member 17 are both members that expand by heat, and the same material can be used. By extracting the thermal expansion lid member 17 from the hole 15, the electric wire can be inserted into the hole 15.

  In the hole 15, a notch 25 connected to the side surface of the thermal expansion member 3 is formed. The range where the cut 25 is formed is, for example, a portion where the opening 27 is formed. Therefore, even when the thermal expansion member 3 is fixed to the holding metal fitting 5, an electric wire or the like can be inserted into the cut 25 from the opening 27 side. By doing in this way, an electric wire can be easily penetrated with respect to the hole 15. FIG. When the holes 15 are arranged in a row, the cuts 25 need only be formed on the opening 27 side.

  A notch 22 is formed in the vertical direction of the thermal expansion member 3. The notch 22 is a part used when fixing an outlet member or a switch member described later. With the fire prevention plate 1 attached to the wiring box 7, the notch 22 is formed at a position corresponding to the hole of the fixing portion 23. For this reason, the frame part 13 etc. of the holding | maintenance metal fitting 5 do not overlap with the site | part in which the notch part 22 is formed.

  Next, the construction method of the wiring structure will be described. 4 is a front view showing a state in which the fire prevention plate 1 is attached, and FIG. 5 is a cross-sectional view of the wiring structure 33 (a cross-sectional view taken along line BB in FIG. 4). In addition, in FIG. 4, about the right fire prevention plate 1, the state which removed the thermal expansion member 3 is shown.

  The wall 29 is a single wall. A through hole 31 is provided in the wall 29. The wiring box 7 is fixed to the back side of the wall 29 of the through hole 31. The wiring box 7 is fixed to, for example, a beam (not shown).

  The through hole 31 is provided in a size corresponding to the wiring box 7. Two fire prevention plates 1 are provided in the wiring box 7. In general, the height of the wiring box 7 is standardized to be constant, and the width is standardized to be an integral multiple of the reference width. In the illustrated example, an example in which the width of the wiring box 7 is twice the reference width is shown. Since the width of the fire prevention plate 1 substantially matches the reference width of the wiring box 7, two fire prevention plates 1 are provided in the illustrated example.

  As described above, the pair of claw portions 9 of the holding metal fitting 5 are fixed to the upper and lower fixing portions 23, respectively. The fire prevention plate 1 can be attached in a state where the thermal expansion member 3 is attached to the holding metal fitting 5 in advance. For this reason, it is excellent in the workability of attaching the fire prevention plate 1. The thermal expansion member 3 can be disposed inside the wall 29. Therefore, the outer peripheral portion of the thermal expansion member 3 can be brought into contact with the inner peripheral surface of the through hole 31. For this reason, the through hole 31 can be reliably closed with the thermal expansion member 3.

  On the other hand, the shape of the through hole 31 may not be a complete rectangle. For example, this is a case where the corner of the through hole 31 has an R shape or the like. In order to cope with such a case, for example, the shape of the thermal expansion member 3 can be set in a rectangular shape in advance, and can be attached in accordance with the shape of the through hole 31 at the site. By doing in this way, the thermal expansion member 3 can be arrange | positioned so that the through-hole 31 may be plugged up reliably. In this case, since only the thermal expansion member 3 can be removed and the shape of the thermal expansion member 3 can be adjusted in a state where the holding metal fitting 5 is attached to the wiring box 7, workability is good.

  Moreover, since only the thermal expansion member 3 can be easily attached and detached, the operation can be performed with the thermal expansion member 3 removed during wiring. At this time, since the notch 25 is provided in the hole 15 through which the electric wire passes, the electric wire can be easily arranged in the hole 15 from the side of the thermal expansion member 3.

  Moreover, the through-hole 31 may not be formed large enough in the construction on the spot. If the through hole 31 is smaller than or equal to the predetermined size, the holding metal fitting 5 interferes with the wall 29 and cannot be disposed inside the through hole 31. In this case, as described above, the protruding pieces at the four corners of the frame portion 13 are cut out from the groove 14 as a starting point. Further, the size of the thermal expansion member 3 is also adjusted according to the size of the through hole 31. As described above, even when the through hole 31 is smaller than the predetermined value, the fire prevention plate 1 can be easily installed on site.

  When a plurality of fire prevention plates 1 are arranged, they are attached to the wiring box 7 so that the openings 27 of at least a pair of adjacent fire prevention plates 1 face each other. In this way, the electric wire can be arranged in the hole 15 from the side cut 25 without removing the thermal expansion member 3 with respect to the hole 15 on the opening 27 side. Moreover, the layout of an electric wire can be easily changed with respect to each fire prevention plate 1.

  As shown in FIG. 5, the outlet member 35 is fixed to the front surface of the wall 29 in a state where the fire prevention plate 1 is fixed. A fixing member 37 such as a bolt is used for fixing the outlet member 35. The fixing member 37 is fixed from the front surface side of the outlet member 35 to the fixing portion 23 on the back surface side of the notch portion 22. Before the outlet member 35 is fixed, an electric wire is connected to the outlet member 35 in advance. The connection between the outlet member 35 and the electric wire may be before or after the fire prevention plate 1 is fixed. In the wiring structure 33 of the present invention, a switch member may be connected instead of the outlet member 35.

  As described above, according to the present embodiment, in the wiring structure in which the through hole 31 is formed in the wall 29, the thermal expansion member 3 can be reliably disposed so as to close the through hole 31. For this reason, necessary fireproof performance can be ensured. Further, since the thermal expansion member 3 is held by the holding metal fitting 5, deformation such as bending or bending during wiring work, breakage, or the like hardly occurs. Further, since the holding metal fitting 5 is fixed to the wiring box 7, it is possible to prevent the thermal expansion member 3 from falling off during wiring work. Further, since the thermal expansion member 3 can be easily attached to and detached from the holding metal fitting 5, it is excellent in wiring workability, and the shape can be easily adjusted according to the shape of the through hole 31.

  Moreover, since the notch 25 is provided in the hole 15 through which the electric wire is inserted, the operation of inserting the electric wire is easy. Moreover, since the unnecessary hole 15 is closed by the thermal expansion lid member 17, it is possible to suppress a decrease in fire prevention performance.

  In addition, since the opening 27 is formed on one side of the frame portion 13, the electric wire can be easily inserted from the side of the frame portion 13.

  Next, a second embodiment will be described. FIG. 6 is an exploded perspective view of the fire prevention plate 1a and the like constituting the wiring structure according to the second embodiment, and FIG. 7A is a perspective view of the holding metal fitting 5a. In addition, in the following description, about the structure similar to the fire prevention plate 1 grade | etc., The code | symbol same as FIGS. 1-5 is attached | subjected, and the overlapping description is abbreviate | omitted.

  Although the fire prevention plate 1a is the structure substantially the same as the fire prevention plate 1, the formation direction of the holding | maintenance part 11 of the holding | maintenance metal fitting 5a differs. In the holding metal 5 a, the holding part 11 is formed in the same direction as the bent part 19 and the claw part 9. Therefore, the thermal expansion member 3 is disposed on the back side of the holding metal fitting 5a.

  FIG. 7B is a view showing a state in which the thermal expansion member 3 is fixed to the holding metal fitting 5a, and FIG. 8 is a cross-sectional view of the fire prevention plate 1a (a cross-sectional view taken along the line CC in FIG. 7B). is there. The thermal expansion member 3 is fixed to the holding metal fitting 5a by inserting the holding portion 11 of the holding metal fitting 5a into the thermal expansion member 3 on the back side of the holding metal fitting 5a.

  Note that the height of the holding portion 11 is preferably slightly lower than the thickness of the thermal expansion member 3. Further, the thermal expansion member 3 is arranged so that the upper and lower sides are sandwiched between the claw portions 9.

  FIG. 9 is a cross-sectional view showing a wiring structure 33a using the fire prevention plate 1a, and corresponds to FIG. The wiring structure 33a is provided on the wall 29a. The wall 29a is a hollow wall.

  The wiring box 7 is fixed to the inner surface side of the wall 29a. The fire prevention plate 1a is fixed to the wiring box 7 from the front side of the wall 29a. At this time, the thermal expansion member 3 is disposed inside the wiring box 7.

  In addition, the connection method of the electric wire to the outlet member 35 and the attachment method of the outlet member 35 are the same as those of the wiring structure 33.

  According to the second embodiment, an effect similar to that of the first embodiment can be obtained. Further, the present invention can be applied to a hollow wall in which the board is thin and the thermal expansion member 3 does not fit within the wall thickness.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1, 1a ... Fire prevention plate 3 ... Thermal expansion member 5, 5a ... Holding bracket 7 ... Wiring box 9 ... Claw part 11 ... Holding part 13 ... Frame part 14 ... ... groove 15 ......... hole 17 ......... thermal expansion cover material 22 ......... notch 23 ......... fixed part 25 ......... notch 27 ......... openings 29, 29a ......... wall 31 ......... Through-hole 33, 33a ......... Wiring structure 35 ......... Outlet member 37 ......... Fixing member

Claims (7)

A fire prevention plate used for a through hole for a wiring box formed on a wall,
A thermal expansion member;
Holding metal fittings for holding the thermal expansion member,
The holding bracket includes a claw portion that can be fixed to the wiring box;
A holding portion for holding the thermal expansion member ,
A hole for wiring is formed in the thermal expansion member, and a thermal expansion lid member is fitted into the hole so as to be insertable / removable, and there is a cut between the hole and the outer peripheral portion of the thermal expansion member. fire plate, wherein Rukoto formed. A fire prevention plate used for a through hole for a wiring box formed on a wall,
A thermal expansion member;
Holding metal fittings for holding the thermal expansion member,
The holding bracket includes a claw portion that can be fixed to the wiring box;
A holding portion for holding the thermal expansion member,
A hole for wiring is formed in the thermal expansion member, and a thermal expansion lid member is fitted into the hole so as to be insertable / removable, and there is a cut between the hole and the outer peripheral portion of the thermal expansion member. Formed,
The holding metal fitting has a frame portion capable of holding the vicinity of the edge of the thermal expansion member,
A part of the frame portion is cut and does not continue in an annular shape. A fire prevention plate used for a through hole for a wiring box formed on a wall,
A thermal expansion member;
Holding metal fittings for holding the thermal expansion member,
The holding bracket includes a claw portion that can be fixed to the wiring box;
A holding portion for holding the thermal expansion member,
A hole for wiring is formed in the thermal expansion member, and a thermal expansion lid member is fitted into the hole so as to be insertable / removable, and there is a cut between the hole and the outer peripheral portion of the thermal expansion member. Formed
The holding metal fitting has a frame portion capable of holding the vicinity of the edge of the thermal expansion member,
A fire prevention plate, wherein a projecting piece is formed on an outer peripheral part of the frame part, and a groove part serving as a cut part with the frame part is formed on a base part of the projecting piece. A fire prevention plate used for a through hole for a wiring box formed on a wall,
A thermal expansion member;
Holding metal fittings for holding the thermal expansion member,
The holding bracket includes a claw portion that can be fixed to the wiring box;
A holding portion for holding the thermal expansion member,
A hole for wiring is formed in the thermal expansion member, and a thermal expansion lid member is fitted into the hole so as to be insertable / removable, and there is a cut between the hole and the outer peripheral portion of the thermal expansion member. Formed,
The claw portion and the holding portion are formed in opposite directions on both sides of the holding fitting,
The fire prevention plate, wherein the holding metal fitting is capable of holding the thermal expansion member outside the wiring box in a state of being fixed to the wiring box. A fire prevention plate used for a through hole for a wiring box formed on a wall,
A thermal expansion member;
Holding metal fittings for holding the thermal expansion member,
The holding bracket includes a claw portion that can be fixed to the wiring box;
A holding portion for holding the thermal expansion member,
A hole for wiring is formed in the thermal expansion member, and a thermal expansion lid member is fitted into the hole so as to be insertable / removable, and there is a cut between the hole and the outer peripheral portion of the thermal expansion member. Formed,
The claw portion and the holding portion are formed in the same direction of the holding fitting,
The fireproof plate, wherein the holding metal fitting is capable of holding the thermal expansion member inside the wiring box in a state of being fixed to the wiring box. A wiring structure formed on a wall using the fire prevention plate according to any one of claims 1 to 5 ,
A wiring box;
Said fire plate attached to the wiring box,
An outlet member or a switch member fixed to the front surface of the fire prevention plate;
Comprising
A wiring structure, wherein wiring is disposed through the thermal expansion member. A construction method using the fire prevention plate according to claim 1 to form a wiring structure on a wall,
Fixing the wiring box to the back side of the through hole formed in the wall;
Connecting the electric wire and the outlet member or the switch member;
Fixing the holding bracket to the wiring box;
Fixing the thermal expansion member cut out in shape to the through hole to the holding fitting;
Fixing the outlet member or the switch member on the front surface of the fire prevention plate;
The wiring structure construction method characterized by comprising.

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