Heat insulating board spacer and wooden building using the same

Abstract

To provide a heat insulating board spacer and a wooden building using the same, capable of forming ventilation layers of a plurality of heights, and capable of restraining a construction cost thereby.SOLUTION: A heat insulation board spacer 26 for installing a heat insulation board separately from a sheathing roof board of a wooden structure and forming a ventilation layer between the heat insulation board and the sheathing roof board includes a main shaft member 27 having a shape extending in one direction, having a pointed end portion on a distal end side, and used by sticking the pointed end portion into one surface of the heat insulation board, and a flange member 28 formed in a flat plate shape having a plurality of fitting holes 28A to 28E each having a shape corresponding to a cross-sectional shape at a different position of the pointed end portion, the pointed end portion being inserted into any one of the plurality of fitting holes 28A to 28E.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an insulating board spacer and a wooden building using the same, and more particularly to the structure of a ventilation layer provided in the sloped ceiling of a wooden building. [Background technology]

[0002] Among the structures of wooden buildings, roof structures that allow residents to see into the attic are called sloped ceilings, and are popular for their sense of openness. Generally, roof structures are arranged in the following order from the exterior: roofing material, underlayment such as waterproofing or roofing sheeting, and sheathing boards, which serve as the base for the roofing material and underlayment. The sheathing boards are placed on multiple rafters that run parallel to the direction of the roof slope.

[0003] In a sloped ceiling, it is necessary to create a space between the rafters on the indoor side of the sheathing board, and use this space as a ventilation layer. This ventilation layer allows hot air and moisture to escape, preventing condensation. Further indoors from the ventilation layer, an insulating layer made of one or more types of insulating material, such as insulating board, glass wool, or urethane foam, is placed between the rafters. Ceiling finishing materials are placed on the indoor side of the rafters.

[0004] Conventionally, various spacer members have been proposed to ensure the above-mentioned ventilation layer between the roofing board and the heat insulating layer. Summary of the Invention [Problem to be solved by the invention]

[0005] However, all conventional spacers create a ventilation layer of a fixed height (the distance between the sheathing board and the insulation layer), and the height of the ventilation layer cannot be adjusted. Therefore, if the rafters are high due to structural constraints, a gap will form between the insulation layer and the ceiling finish material unless the insulation layer is made thicker. However, making the insulation layer thicker than necessary leads to an increase in construction costs.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide an insulating board spacer that can form ventilation layers of multiple heights, thereby reducing construction costs, and a wooden building that uses the same. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides an insulation board spacer for installing an insulation board at a distance from a sheathing board of a wooden building and forming an air permeable layer between the insulation board and the sheathing board, the insulation board spacer having a shape extending in one direction and a pointed end on the tip side, a main shaft member used by piercing the pointed end into one surface of the insulation board, a first fitting hole having a shape corresponding to a first cross section at a first position of the pointed end, and a second cross section at a second position on the base side of the pointed end. and a collar member having a second fitting hole having a corresponding shape and larger than the first fitting hole, wherein the pointed portion has a shape in which the second cross section is larger than the first cross section, and has a cross section through which the first fitting hole can pass from the tip to the first position, and a cross section on the proximal side of the first position through which the first fitting hole cannot pass, and has a cross section through which the second fitting hole can pass from the first position to the second position, and a cross section on the proximal side of the second position through which the second fitting hole cannot pass. Here, the pointed portion may have a cross section that is the same as or smaller than the first cross section from the tip to the first position, a cross section that is larger than the first cross section on the proximal side of the first position, a cross section that is the same as or smaller than the second cross section from the first position to the second position, or a cross section that is larger than the second cross section on the proximal side of the second position. For example, the pointed portion may have a cross section that gradually or stepwise increases from the tip to the proximal side.

[0008] At least the tip end of the main shaft member may include three or more flat plate portions each extending in the one direction and connected to one another at a central axis, and each of the flat plate portions may increase in width from the tip end toward the base end.

[0009] The three or more flat plate portions may have the same shape, and may be arranged at equal angles around the central axis.

[0010] Furthermore, at least the tip end of the main shaft member may include a first flat plate portion, a second flat plate portion, a third flat plate portion, and a fourth flat plate portion, each extending in the one direction and connected to one another at a central axis. The first flat plate portion, the second flat plate portion, the third flat plate portion, and the fourth flat plate portion may be arranged in this order at equal angles around the center. Each of the first to fourth flat plate portions may increase in width from the tip end toward the base end. Furthermore, the first flat plate portion and the third flat plate portion may have the same shape, and the second flat plate portion and the fourth flat plate portion may also have the same shape.

[0011] The flange member may be flat and have the first and second fitting holes formed therein. A protrusion may be formed on one surface of the flange member. For example, the protrusion may be a rib provided along the outer edge of the flange member.

[0012] The flange member may have an outer shape with one-fold rotational symmetry. For example, the flange member may have an outer shape formed by a circular arc and a straight line connecting both ends of the circular arc.

[0013] At least one of the first and second fitting holes may have a shape in which a plurality of elongated holes into which the flat plate portions fit are connected at one end, and the plurality of elongated holes are arranged radially. The connecting portion between adjacent elongated holes may have a curved inner edge. For example, the curved inner edge may be formed in a convex shape toward the center of the first or second fitting hole.

[0014] The wooden building according to the present invention includes a roof sheathing board, an insulating board spaced apart from the sheathing board, and an insulating board spacer disposed between the sheathing board and the insulating board, the insulating board spacer having a shape extending in one direction and a pointed end on the tip side, a main shaft member used by piercing the pointed end into one surface of the insulating board, a first fitting hole having a shape corresponding to a first cross section at a first position of the pointed end, and a second cross section at a second position on the base side of the pointed end from the first position. and a flange member having a second fitting hole having a corresponding shape and larger than the first fitting hole, and the pointed end has a shape in which the second cross section is larger than the first cross section, and has a cross section through which the first fitting hole can pass from the tip to the first position, and a cross section on the base end side of the first position through which the first fitting hole cannot pass, and has a cross section through which the second fitting hole can pass from the first position to the second position, and a cross section on the base end side of the second position through which the second fitting hole cannot pass. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view showing a sloped ceiling of a wooden building according to an embodiment of the present invention. [Figure 2] 1 is a perspective view showing an insulating board spacer according to an embodiment of the present invention. [Figure 3] FIG. 2 is a perspective view showing a main shaft member of the heat insulating board spacer. [Figure 4] FIG. 2 is a perspective view showing a flange member of the heat insulating board spacer. [Figure 5] FIG. 10 is a side view of a main shaft member of the heat insulating board spacer according to the first modified example. [Figure 6] FIG. 10 is a view showing a base end surface of a main shaft member of an insulating board spacer according to a first modified example. [Figure 7] FIG. 10 is a plan view of a flange member of a heat insulating board spacer according to a first modified example. [Figure 8] FIG. 10 is a perspective view showing a heat insulating board spacer according to a second modified example. [Figure 9]FIG. 10 is a perspective view showing a main shaft member of a heat insulating board spacer according to a second modified example. [Figure 10] FIG. 10 is a perspective view showing a flange member of a heat insulating board spacer according to a second modified example. [Figure 11] FIG. 10 is a perspective view showing another mode of use of the heat insulating board spacer according to the second modified example. [Figure 12] FIG. 11 is a perspective view showing a flange member of a heat insulating board spacer according to a third modified example. [Figure 13] FIG. 11 is a bottom view of a flange member of the heat insulating board spacer according to the third modified example. [Figure 14] FIG. 11 is an enlarged plan view of a fitting hole provided in a flange member of a heat insulating board spacer according to a third modified example. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0017] Figure 1 is a cross-sectional view showing a sloped ceiling of a wooden building according to an embodiment of the present invention. The figure shows a cross section of the roof perpendicular to the direction in which rafters 18 extend. As shown in the figure, the roof of this wooden building is composed of, from the exterior side, roofing material 10, underlayment material 12 such as a waterproof sheet or roofing sheet, and sheathing boards 14, which serve as a base for roofing material 10 and underlayment material 12. Sheathing boards 14 are fixed onto a number of rafters 18 that extend parallel to the slope of the roof.

[0018] Between adjacent rafters 18, insulation boards 20 are placed parallel to and spaced apart from the sheathing boards 14. The insulation boards 20 may be foamed plastic insulation material such as phenolic foam, which is a relatively lightweight insulation material that can maintain its plate shape by itself.

[0019] Other insulating materials 22, such as glass wool or urethane foam, are arranged on the indoor side of the insulating board 20. Plate-shaped ceiling finishing material 16 is arranged on the indoor side of the rafters 18 and fixed to the rafters 18. In other words, the space surrounded by the ceiling finishing material 16, rafters 18, and insulating board 20 is filled with insulating material 22.

[0020] In the roof structure described above, in this embodiment, spacers 26 are used to position the insulation boards 20 parallel to and spaced apart from the sheathing boards 14. As described below, the spacers 26 have pointed ends formed at their tips. During construction, the pointed ends of multiple spacers 26 are inserted into one side of the insulation board 20, which has been cut to fit precisely between the rafters 18. This fixes the multiple spacers 26 in a generally vertical position against one side of the insulation board 20. In this state, the insulation board 20 is pushed parallel to the sheathing boards 14 between the rafters 18, so that the base end of each spacer 26 abuts against the sheathing boards 14. This creates a ventilation layer 24 of the desired height between the insulation boards 20 and the sheathing boards 14. As described above, the ventilation layer 24 allows hot air and moisture to escape from within the roof structure. The insulation boards 20 are sufficiently lightweight and are sandwiched between adjacent rafters 18 to prevent them from falling off during construction.

[0021] Fig. 2 is a perspective view of the spacer 26. Fig. 3 is a perspective view showing only the main shaft member 27 of the spacer 26. Fig. 4 is a perspective view showing only the flange member 28 of the spacer 26.

[0022] Spacer 26 includes a main shaft member 27 and a flange member 28, and is used by fitting the tip of main shaft member 27 into one of a plurality of fitting holes 28A to 28E provided in flange member 28. Main shaft member 27 has a shape that extends in one direction, and has a central axis 29, for example. Main shaft member 27 may be made of any material, but here it is made of resin to ensure low cost and light weight. Main shaft member 27 also has a shape (pointed shape) in which the cross-sectional area increases from tip 27t toward base end 27e, making it easier to pierce tip 27t into insulation board 20.

[0023] Here, the entire portion from the tip 27t to the base 27e is a pointed portion (a portion having a pointed shape). However, only a certain length from the tip 27t may be a pointed portion. Even in this case, at least the pointed portion can be smoothly inserted into the insulation board 20. The pointed portion may have a cross-sectional area that increases at a constant rate toward the base 27e, a cross-sectional area that increases at a variable rate, or a cross-sectional area that does not change along the way. Furthermore, any shape may be used as long as the main shaft member 27 can pass through the fitting holes 28A-28E to the respective fitting positions A-E when inserted into the fitting holes. For example, the main shaft member 27 may have a portion where the cross-sectional area decreases along the way. It is desirable that the cross-sectional shapes of the pointed portion at any position on the central axis 29 are similar and that the cross-sectional shapes at any position are aligned. This allows the main shaft member 27 to be smoothly inserted into the fitting holes 28A-28E of the flange member 28.

[0024] The portion other than the pointed end may have any shape, for example, a constant cross-sectional area. The base end 27e may also be formed into a flat plate shape. This allows for stable contact with the sheathing board 14. This also improves the strength of the main shaft member 27.

[0025] 3, the pointed end of the main shaft member 27 is composed of, for example, four flat plate portions 27a to 27d. The flat plate portions 27a to 27d all extend from the tip 27t toward the base end 27e and are connected to each other at the central axis 29. Here, for example, the flat plate portions 27a to 27d have the same shape, and are all right-angled triangles with an acute angle at the tip 27t and a right angle at the base end 27e. The side opposite the acute angle at the tip 27t forms the base end 27e, and the adjacent side is aligned with the central axis 29.

[0026] Although the flat plate portions 27a to 27d have the same shape here, they may be different. Furthermore, they do not have to be right-angled triangular. For example, they may be shaped so that their width gradually and / or stepwise increases from the tip 27t toward the base end 27e. Furthermore, the flat plate portions 27a to 27d are arranged at equal angles around the central axis 29. This results in the entire pointed end of the main shaft member 27 having a (four-fold) rotationally symmetrical shape.

[0027] 4, flange member 28 has a disk-shaped flange body 28a, which has five fitting holes 28A to 28E. Flange member 28 may also be made of a resin material. Fitting holes 28A to 28E are similar in shape, with the areas of the holes decreasing in this order. Fitting holes 28A to 28E all have shapes that correspond to the vertical cross-sectional shapes of different positions on center axis 29 of the pointed end of main shaft member 27.

[0028] 3, fitting positions A to E are set in order of increasing distance from tip 27t of main shaft member 27 along central axis 29, and the cross-sectional shape of main shaft member 27 at fitting position A matches the shape of fitting hole 28A. Similarly, the cross-sectional shape of main shaft member 27 at fitting position B matches the shape of fitting hole 28B, the cross-sectional shape of main shaft member 27 at fitting position C matches the shape of fitting hole 28C, and the cross-sectional shape of main shaft member 27 at fitting position D matches the shape of fitting hole 28D. Furthermore, the cross-sectional shape of main shaft member 27 at fitting position E matches the shape of fitting hole 28E. In this embodiment, as described above, main shaft member 27 has a shape formed by combining flat plate portions 27a to 27d each having the same right-angled triangle shape, and these are arranged at equal angles (90 degrees) around central axis 29, so that fitting holes 28A to 28E are all cross-shaped. Furthermore, fitting holes 28A to 28E also have (four-fold) rotationally symmetric shapes. Note that, although the cross-sectional shape of main shaft member 27 at fitting position A matches the shape of fitting hole 28A, they do not need to match perfectly, and for example, fitting hole 28A may have a shape such that 50% or more of its inner surface contacts the outer surface of main shaft member 27. The same applies to the other fitting holes 28B to 28E.

[0029] In the main shaft member 27 and flange member 28 having the above configuration, when the tip of the main shaft member 27 is inserted into the fitting hole 28A of the flange member 28, the cross section from the tip of the main shaft member 27 to the fitting position A is smaller than the fitting hole 28A, so the main shaft member 27 can pass from the tip to the fitting position A. On the other hand, the cross section of the main shaft member 27 on the base side of the fitting position A is larger than the fitting hole 28A, so the main shaft member 27 cannot pass further to the base side. Therefore, as shown in FIG. 2, the flange member 28 stops at the fitting position A of the main shaft member 27. Only the portion of the main shaft member 27 distal to the flange member 28 penetrates the insulation board 20, and the length of the portion proximal to the flange member 28 is the height of the ventilation layer. Therefore, when the fitting hole 28A is used, the spacer 26 can be used as the lowest spacer.

[0030] Similarly, when the pointed end of main shaft member 27 is inserted into fitting hole 28B of flange member 28, flange member 28 will stop at fitting position B of main shaft member 27, and spacer 26 can be used as the second lowest spacer. When the pointed end of main shaft member 27 is inserted into fitting hole 28C of flange member 28, flange member 28 will stop at fitting position C of main shaft member 27, and spacer 26 can be used as the third lowest spacer. When the pointed end of main shaft member 27 is inserted into fitting hole 28D of flange member 28, flange member 28 will stop at fitting position D of main shaft member 27, and spacer 26 can be used as the fourth lowest spacer. When the pointed end of the main shaft member 27 is inserted into the fitting hole 28E of the flange member 28, the flange member 28 stops at the fitting position E of the main shaft member 27, and the spacer 26 can be used as the fifth lowest (i.e., the highest) spacer.

[0031] According to this embodiment, by inserting the pointed end of the main shaft member 27 into any of the fitting holes 28A to 28E of the flange member 28, it can be used as a spacer of multiple heights (here, five). As a result, the height of the ventilation layer 24 can be adjusted using just one type of spacer 26. Therefore, if the height of the rafters is high due to structural constraints, the ventilation layer 24 can be made higher to avoid the insulation layer, particularly the insulation material 22, becoming unnecessarily thick. This helps to reduce construction costs.

[0032] Furthermore, by forming the main shaft member 27 as a structure in which the flat plate portions 27a to 27d are combined as described above, it is possible to ensure sufficient strength for the main shaft member 27 with a small amount of raw material, and as a result, the main shaft member 27 will not bend after construction.

[0033] In addition, when main shaft member 27 is thrust into heat insulating board 20, the contact area becomes large, which has the advantage that main shaft member 27 is less likely to come out of heat insulating board 20 due to friction. Furthermore, since the areas of fitting holes 28A to 28E are small, there is also the advantage that the strength of flange member 28 is maintained even when fitting holes 28A to 28E are drilled in flange main body 28a.

[0034] Furthermore, since main shaft member 27 and fitting holes 28A to 28E are shaped to have rotational symmetry, there is also the advantage that main shaft member 27 can be attached at the construction site without having to worry about the orientation of flange member 28.

[0035] Furthermore, when attempting to build the same or similar wooden buildings in various regions, it may be necessary to vary the thickness of the insulation material 22 for each region in order to meet the residential insulation performance requirements set for each region. Even in such cases, by using the spacer 26 according to this embodiment, it is possible to easily form the ventilation layer 24 of the desired height, thereby enabling the insulation material 22 to be installed with a necessary and sufficient thickness for each region.

[0036] The present invention is not limited to the above embodiment, and various modifications are possible. For example, the shape of the main shaft member is not limited to the above embodiment, and various shapes may be adopted. For example, the main shaft member may be conical, and the fitting hole of the flange member may be a circular hole of various diameters accordingly. Furthermore, although the main shaft member 27 is formed of four flat plates in the above embodiment, it may also be formed of three flat plates.

[0037] Fig. 5 is a diagram showing a side surface of a main shaft member of a spacer according to a first modified example, Fig. 6 is a diagram showing a base end surface thereof, and Fig. 7 is a plan view of a flange member used in the main shaft member shown in Figs.

[0038] As shown in Figures 5 and 6, the main shaft member 30 of the spacer according to the first modified example is composed of three flat plate portions 30a to 30c. The flat plate portions 30a to 30c have the same right-angled triangular shape and are connected at a central axis 31. Each of the flat plate portions 30a to 30c has an acute angle at the tip end and a right angle at the base end, with the side adjacent to the acute angle aligned with the central axis 31. The flat plate portions 30a to 30c are also arranged at equal angles around the central axis 31. As a result, the pointed end of the main shaft member 30 has a (three-fold) rotationally symmetric shape as a whole.

[0039] As shown in FIG. 7, the flange member 40 used with the main shaft member 30 has a disk-shaped flange body 40a, which has five fitting holes 40A to 40E. The fitting holes 40A to 40E are similar in shape, with the area of ​​the holes decreasing in this order. Each fitting hole has a shape corresponding to the cross-sectional shape of the tip of the main shaft member 30 at a different position. That is, as shown in FIG. 5, fitting positions A to E are set in order of increasing distance from the tip of the main shaft member 30 along the central axis 31, and the cross-sectional shape of the main shaft member 30 at fitting position A matches the shape of fitting hole 40A. Similarly, the cross-sectional shape of the main shaft member 30 at fitting position B matches the shape of fitting hole 40B, the cross-sectional shape of the main shaft member 30 at fitting position C matches the shape of fitting hole 40C, and the cross-sectional shape of the main shaft member 30 at fitting position D matches the shape of fitting hole 40D. Furthermore, the cross-sectional shape of the main shaft member 30 at the fitting position E matches the shape of the fitting hole 40E.

[0040] The spacer according to the first modification can also be used as spacers of a plurality of heights by inserting the pointed end of the main shaft member 30 into any one of the fitting holes 40A to 40E of the flange member 40. In particular, the spacer according to the first modification can be formed using less material, thereby achieving weight reduction and cost reduction.

[0041] Fig. 8 is a perspective view showing a spacer according to a second modified example. Fig. 9 is a perspective view showing a main shaft member 50 of the spacer shown in Fig. 8, and Fig. 10 is a perspective view showing a flange member 60 of the spacer. Also, Fig. 11 is a perspective view showing another mode of use of the spacer shown in Fig. 8.

[0042] As shown in FIG. 9, the pointed end of the main shaft member 50 is composed of four flat plate portions 50a to 50d. The flat plate portions 50a to 50d each extend from a tip 50t toward a base end 50e and are connected to each other at a central axis 51. The flat plate portions 50a to 50d each have a right-angled triangular shape, with an acute angle at the tip 50t and a right angle at the base end 50e. The opposite side of the acute angle at the tip 50t forms the base end 27e, and the adjacent side is located on the central axis 51. Here, in the main shaft member 50, the flat plate portions 50a and 50c have the same triangular shape, and the flat plate portions 50b and 50d also have the same triangular shape. However, the flat plate portions 50b and 50d have a wider triangular shape (i.e., the opposite side of the acute angle is longer) than the flat plate portions 50a and 50c. The flat plate portions 50a and 50c are arranged on the same plane, and the flat plate portions 50b and 50d are arranged on the same plane. The flat plate portions 50a and 50c are perpendicular to the flat plate portions 50b and 50d. That is, the flat plate portions 50a to 50d are arranged in this order at equal angles (90 degrees) around the central axis 51. With the above configuration, the cross-sectional shape of the pointed end of the main shaft member 50 is a two-fold rotationally symmetric cross shape, in which the cross-sectional portions corresponding to the flat plate portions 50a and 50c are short and have the same length, and the cross-sectional portions corresponding to the flat plate portions 50b and 50d are long and have the same length.

[0043] Although the flat plate portions 50a to 50d are triangular in shape here, they may have any shape as long as the width increases gradually and / or in steps from the tip 50t toward the base end 50e.

[0044] 10, the flange member 60 has a disk-shaped flange body 60a, which has two fitting holes 60A and 60B. The fitting holes 60A and 60B are similar in shape, with the areas of the holes decreasing in this order. Each of the fitting holes has a shape corresponding to the cross-sectional shape of the pointed end of the main shaft member 27 at different positions, taken perpendicular to the central axis 29.

[0045] That is, as shown in FIG. 9 , fitting positions A1, A2, B1, and B2 are set in ascending order of distance from the tip 50t of the main shaft member 50 along the central axis 51. The cross-sectional shape of the main shaft member 50 at fitting position A1 matches the shape of the fitting hole 60A. Similarly, the cross-sectional shape of the main shaft member 50 at fitting position B1 matches the shape of the fitting hole 60B. That is, the shapes of the fitting holes 60A and 60B are similar, and both are cross-shaped with two-fold rotational symmetry. Specifically, the fitting hole 60A has partial holes 60A-a and 60A-c corresponding to the cross sections of the flat plate portions 50a and 50c, respectively, and partial holes 60A-b and 60A-d corresponding to the cross sections of the flat plate portions 50b and 50d, respectively. The partial holes 60A-a and 60A-c are elongated holes of the same length and are arranged on the same straight line. Partial holes 60A-b and 60A-d are also elongated holes of the same length and are arranged on the same straight line. However, the length of partial holes 60A-a and 60A-c is shorter than the length of partial holes 60A-b and 60A-d. The extension direction of partial holes 60A-a and 60A-c is perpendicular to the extension direction of partial holes 60A-b and 60A-d.

[0046] Similarly, the fitting hole 60B has partial holes 60B-a and 60B-c corresponding to the cross sections of the flat plate portions 50a and 50c, respectively, and partial holes 60B-b and 60B-d corresponding to the cross sections of the flat plate portions 50b and 50d, respectively. The partial holes 60B-a and 60B-c are elongated holes of the same length and are arranged on the same straight line. The partial holes 60B-b and 60B-d are also elongated holes of the same length and are arranged on the same straight line. However, the length of the partial holes 60B-a and 60B-c is shorter than the length of the partial holes 60B-b and 60B-d. The extension direction of the partial holes 60B-a and 60B-c is perpendicular to the extension direction of the partial holes 60B-b and 60B-d.

[0047] In the main shaft member 50 and flange member 60 having the above configuration, when the pointed end of the main shaft member 50 is inserted into the fitting hole 60A of the flange member 60 in its original orientation, that is, so that the flat plate portion 50a fits into the partial hole 60A-a, the flat plate portion 50b fits into the partial hole 60A-b, the flat plate portion 50c fits into the partial hole 60A-c, and the flat plate portion 50d fits into the partial hole 60A-d, the flange member 60 will stop at fitting position A1 of the main shaft member 50, as shown in Figures 8 and 9. Similarly, when the pointed end of the main shaft member 50 is inserted into the fitting hole 60B of the flange member 60 in the original orientation, i.e., so that the flat plate portion 50a fits into the partial hole 60B-a, the flat plate portion 50b fits into the partial hole 60B-b, the flat plate portion 50c fits into the partial hole 60B-c, and the flat plate portion 50d fits into the partial hole 60B-d, the flange member 60 will stop at the fitting position B1 of the main shaft member 50.

[0048] On the other hand, when the pointed end of main shaft member 50 is rotated 90 degrees around central axis 51 and inserted into fitting hole 60A of flange member 60, flat plate portion 50a fits into partial hole 60A-b, flat plate portion 50b fits into partial hole 60A-c, flat plate portion 50c fits into partial hole 60A-d, and flat plate portion 50d fits into partial hole 60A-a, as shown in Figure 11 for example. Although not shown, when the main shaft member 50 is rotated 90 degrees in the opposite direction around central axis 51 and inserted into fitting hole 60A of flange member 60, flat plate portion 50a fits into partial hole 60A-d, flat plate portion 50b fits into partial hole 60A-a, flat plate portion 50c fits into partial hole 60A-b, and flat plate portion 50d fits into partial hole 60A-c, respectively. 9 and 11, the flange member 60 stops at the fitting position A2 of the main shaft member 50. That is, as described above, the flat plate portions 50b and 50d are wider than the flat plate portions 50a and 50c, but the partial holes 60A-a and 60A-c into which they are inserted are elongated holes that are shorter than the partial holes 60A-b and 60A-d. Therefore, when the flat plate portions 50b and 50d are completely fitted into the partial holes 60A-a and 60A-c, the flange member 60 cannot be inserted any further, and the flange member 60 stops at the fitting position A2. In this case, the flat plate portions 50a and 50c are partially fitted into the partial holes 60A-b and 60A-d.

[0049] Similarly, when the pointed end of the main shaft member 50 is rotated 90 degrees around the central axis 51 and inserted into the fitting hole 60B of the flange member 60, the flat plate portion 50a fits into the partial hole 60B-b, the flat plate portion 50b fits into the partial hole 60B-c, the flat plate portion 50c fits into the partial hole 60B-d, and the flat plate portion 50d fits into the partial hole 60B-a, respectively (not shown). Alternatively, when the main shaft member 50 is rotated 90 degrees in the opposite direction around the central axis 51 and inserted into the fitting hole 60B of the flange member 60, the flat plate portion 50a fits into the partial hole 60B-d, the flat plate portion 50b fits into the partial hole 60B-a, the flat plate portion 50c fits into the partial hole 60B-b, and the flat plate portion 50d fits into the partial hole 60B-c, respectively. In this manner, the flange member 60 stops at the fitting position B2 of the main shaft member 50.

[0050] According to the spacer of the second modification, when the tip of the main shaft member 50 is inserted into the fitting hole 60A of the flange member 60 in the original orientation, the flange member 60 stops at A1, allowing it to be used as the lowest spacer. When the tip of the main shaft member 50 is rotated 90 degrees and inserted into the fitting hole 60A of the flange member 60, the flange member 60 stops at A2, allowing it to be used as the second lowest spacer. When the tip of the main shaft member 50 is inserted into the fitting hole 60B of the flange member 60 in the original orientation, the flange member 60 stops at B1, allowing it to be used as the third lowest spacer. When the tip of the main shaft member 50 is rotated 90 degrees and inserted into the fitting hole 60B of the flange member 60, the flange member 60 stops at B2, allowing it to be used as the highest spacer.

[0051] According to the spacer of the second modification, fitting holes 60A and 60B can each be made to have two different heights, which reduces the number of fitting holes opened in flange member 60. This allows the strength of flange member 60 to be improved.

[0052] Although the number of fitting holes opened in the flange member 60 is two here, three or more fitting holes may be opened. Alternatively, the flange member 60 may have only one fitting hole opened.

[0053] Fig. 12 is a perspective view showing a flange member of an insulating board spacer according to a third modified example. Fig. 13 is a bottom view of the flange member 70, showing the back surface of the flange member 70. Fig. 14 is an enlarged plan view of a fitting hole provided in the flange member 70. The flange member 70 shown in these figures is used together with the main shaft member 30 according to the second modified example (see Fig. 5) instead of the flange member 40 according to the second modified example (see Fig. 7).

[0054] The flange member 70 has a generally circular, flat plate portion 70a, with seven fitting holes 70A-70G formed in the flat plate portion 70a. The flat plate portion 70a has a shape formed by linearly cutting out a portion of a circular plate. That is, the outer edge of the flange member 70 is composed of an arc portion 70c and a linear portion 70d connecting both ends of the arc portion. Furthermore, a rib 70b is provided on one surface of the flat plate portion 70a. This rib 70b stands along the periphery of the flat plate portion 70a. The main shaft member 30 may be fitted into the fitting holes 70A-70G from the side on which the rib 70b is provided, or from the side on which the rib 70b is not provided. That is, when attaching the insulation board spacer to the insulation board 20, the side on which the rib b is provided may be in contact with the insulation board 20, or the side on which the rib b is not provided may be in contact with the insulation board 20.

[0055] The fitting holes 70A to 70G become smaller in this order, and have shapes corresponding to the cross sections of the seven fitting positions aligned from the base end side to the tip end side of the main shaft member 30. As a result, for example, fitting hole 70A fits with the main shaft member 30 at the fitting position closest to the base end of the main shaft member 30. Also, for example, fitting hole 70G fits with the main shaft member 30 at the fitting position closest to the tip end of the main shaft member 30.

[0056] Specifically, the fitting holes 70A-70G have a shape in which one end of three elongated holes are connected, and the elongated holes are arranged at equal angular intervals and radially. The flat plate portions 30a-30c of the main shaft member 30 fit into each elongated hole portion. In particular, a curved inner edge is formed at the connecting portion between adjacent elongated holes. For example, as shown in FIG. 14, the fitting hole 70A has a shape in which three elongated holes 80 are arranged radially, and a curved inner edge 81 is formed at the connecting portion between adjacent elongated holes 80. Specifically, this inner edge 81 has a convex shape, i.e., a shape that protrudes toward the center of the fitting hole 70A. As a result, the width W2 of the base end of the elongated holes 80 is wider than the width W1 of the tip end of the elongated holes 80. The width W1 of the tip end is approximately equal to the thickness of the flat plate portions 30a-30c of the main shaft member 30. Meanwhile, the width W2 of the base end is wider.

[0057] As described above, the rib 70b is provided on the flange member 70, which increases the strength of the flange member 70. Furthermore, by relying on the presence or absence of the rib 70b, a worker can tell, just by touching it, which side of the flange member 70 they are touching. Furthermore, because the flange member 70 has an outer shape with a straight portion 70d, a worker can tell, just by touching it, the orientation of the flange member 70 (the relative position of the straight portion 70d with respect to the arc portion 70c) by relying on the position of the straight portion 70d. This allows the flange member 70 to always be placed on the insulation board 70 in the same position. For example, the flange member 70 can be placed on the insulation board 70 so that the side without the rib b is always in contact with the insulation board 70 and so that the straight portion 70d is always facing forward.

[0058] When the flange member 70 is always placed on the insulation board 70 in the same state, each of the fitting holes 70A to 70G is always located in the same position relative to the worker. This allows the worker to reliably fit the main shaft member 30 into the intended fitting hole. For example, when the flange member 70 is placed on the insulation board with the rib 70b facing up and the straight portion 70d facing forward, the fitting hole 70D is always located in the upper right portion of the flange member 70, allowing the worker to easily fit the main shaft member 30 into the fitting hole 70D. A single construction site requires many insulation board spacers of the same height, but this modification can improve the efficiency of the task of fitting the main shaft member 30 into a specific one of the fitting holes 70A to 70G.

[0059] As described above, the fitting holes 70A to 70G have curved inner edges at the connecting portions of adjacent elongated holes, and the openings in the central portions are wider than those of the flange member 40 shown in FIG. 7. This allows the tip of the main shaft member 30 to be easily inserted into the fitting holes 70A to 70G. Furthermore, the inner edges of the connecting portions of the elongated holes are convex toward the center of the fitting holes 70A to 70G. Therefore, when the tip of the main shaft member 30 is inserted into the fitting holes 70A to 70G, even if the angle between the fitting holes 70A to 70G is misaligned, the tip of the main shaft member 30 abuts against the convex portion of the fitting holes 70A to 70G, causing the main shaft member 30 to rotate clockwise or counterclockwise. This allows the flat plate portions 30a to 30c of the main shaft member 30 to be guided into the elongated holes of the fitting holes 70A to 70G, respectively. Thus, according to this modification, the efficiency of the operation of fitting the main shaft member 30 into the fitting holes 70A to 70G can be further improved.

[0060] The external shape of the flange member 70 is not limited to that described above, and as long as it has an external shape that is rotationally symmetric once, the worker can determine the orientation of the flange member 70 just by touching it. Furthermore, the part provided on one side of the flat plate portion 70a is not limited to the peripheral rib 70b, and protrusions of other shapes may be provided. For example, one or more conical protrusions that can pierce the insulation board 20 may be provided. Even in this case, the worker can determine the front and back of the flange member 70 just by touching it. [Explanation of symbols]

[0061] 10 roof material, 12 underlayment material, 14 sheathing board, 16 ceiling finishing material, 18 rafter, 20 insulation board, 22 insulation material, 24 ventilation layer, 26 (insulation board) spacer, 27, 30, 50 main axis member, 27a to 27d, 30a to 30c, 50a to 50d flat plate portion, 28, 40, 60, 70 flange member, 28A to 28E, 40A to 40E, 60A, 60B, 70A to 70G fitting hole, 29, 31, 51 central axis, A to E, A1, A2, B1, B2 fitting position.

Claims

1. An insulation board spacer for installing an insulation board at a distance from a roofing board of a wooden building and forming a ventilation layer between the insulation board and the roofing board, a main shaft member having a shape extending in one direction and a pointed end portion at a tip end side, the pointed end portion being used by piercing one surface of the heat insulating board; a flange member in which a first fitting hole having a shape corresponding to a first cross section of the pointed end at a first position, and a second fitting hole having a shape corresponding to a second cross section of the pointed end at a second position on the base end side of the first position and larger than the first fitting hole are formed; The pointed end is The second cross section is larger than the first cross section, a cross section through which the first fitting hole can pass from the tip to the first position, and a cross section through which the first fitting hole cannot pass on the base end side of the first position; a cross section through which the second fitting hole can pass from the first position to the second position, and a cross section through which the second fitting hole cannot pass on the base end side of the second position; Insulation board spacer.

2. 2. The insulation board spacer according to claim 1, The pointed end is a cross section that is equal to or smaller than the first cross section from the distal end to the first position, and a cross section that is larger than the first cross section on the proximal side of the first position; a cross section that is equal to or smaller than the second cross section from the first position to the second position, and a cross section that is larger than the second cross section on the proximal side of the second position; Insulation board spacer.

3. 3. The insulation board spacer according to claim 2, The cross section of the pointed portion gradually or stepwise increases from the tip to the base end. Insulation board spacer.

4. 2. The insulation board spacer according to claim 1, At least the pointed end portion of the main shaft member includes three or more flat plate portions each extending in the one direction and connected to each other at a central axis. Insulation board spacer.

5. 5. The insulation board spacer according to claim 4, The three or more flat plate portions have the same shape. Insulation board spacer.

6. 6. The insulation board spacer according to claim 5, The three or more flat plate portions are arranged at equal angles around the central axis. Insulation board spacer.

7. 5. The insulation board spacer according to claim 4, At least the pointed end portion of the main shaft member includes a first flat plate portion, a second flat plate portion, a third flat plate portion, and a fourth flat plate portion, each of which extends in the one direction and is connected to one another at a central axis, the first flat plate portion, the second flat plate portion, the third flat plate portion, and the fourth flat plate portion are arranged in this order at equal angles around the center; the first flat plate portion and the third flat plate portion have the same shape, and the second flat plate portion and the fourth flat plate portion have the same shape; Insulation board spacer.

8. 2. The insulation board spacer according to claim 1, the flange member is a flat plate having the first fitting hole and the second fitting hole, and has a protrusion formed on one surface thereof; Insulation board spacer.

9. 9. The insulation board spacer according to claim 8, The protrusion is a rib provided along the outer edge of the flange member. Insulation board spacer.

10. 9. The insulation board spacer according to claim 8, The flange member has an outer shape with one-fold rotational symmetry. Insulation board spacer.

11. 11. The insulation board spacer according to claim 10, The flange member has an outer shape consisting of an arc and a straight line connecting both ends of the arc. Insulation board spacer.

12. 7. The insulation board spacer according to claim 6, At least one of the first and second fitting holes has a shape in which a plurality of elongated holes into which the flat plate portions fit are connected at one end, the plurality of elongated holes are arranged radially, and a curved inner edge is provided at the connecting portion of the adjacent elongated holes. Insulation board spacer.

13. 13. The insulation board spacer of claim 12, The curved inner edge is formed convexly toward the center of the first or second fitting hole. Insulation board spacer.

14. The roof sheathing and An insulating board arranged at a distance from the sheathing board; an insulation board spacer disposed between the sheathing board and the insulation board; Including, The insulation board spacer is a main shaft member having a shape extending in one direction and a pointed end portion at a tip end side, the pointed end portion being used by piercing one surface of the heat insulating board; a flange member in which a first fitting hole having a shape corresponding to a first cross section of the pointed end at a first position, and a second fitting hole having a shape corresponding to a second cross section of the pointed end at a second position on the base end side of the first position and larger than the first fitting hole are formed; The pointed end is The second cross section is larger than the first cross section, a cross section through which the first fitting hole can pass from the tip to the first position, and a cross section through which the first fitting hole cannot pass on the base end side of the first position; a cross section through which the second fitting hole can pass from the first position to the second position, and a cross section through which the second fitting hole cannot pass on the base end side of the second position; wooden building.

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