JP4818670B2 - Groove forming tool for heat insulating material made of foamed resin, and method for forming piping groove in heat insulating material - Google Patents

Description

  The present invention relates to a groove forming tool for a foamed resin heat insulating material, which is rotated by a rotary tool and forms a groove for piping a pipe in a heat insulating material provided between a housing wall and a finishing material of a building wall, and the heat insulating material The present invention relates to a method for forming a piping groove in

  A heat insulating wall (heat insulating material) made of foamed resin is installed between the outer wall (building wall) of the building wall and the inner wall (finishing material) installed on the indoor side of the outer wall. In electrical work, in order to route a cable between the outer wall and the inner wall, a piping groove is formed in a foamed resin heat insulating material (hereinafter sometimes simply referred to as “heat insulating material”) installed between both walls. There is an operation of forming, piping a pipe in the piping groove, and inserting a cable through the pipe (Patent Document 1).

Conventionally, in order to form a piping groove in a heat insulating material, a groove forming line is marked on the heat insulating material, and the heat insulating material is cut along the groove forming line using a cutting tool such as a knife. It was. For this reason, a technique is required to cut the heat insulating material into a width and a depth corresponding to the outer diameter of the piping groove, and the cutting work itself is performed manually, which is a very troublesome work. In particular, the depth of the piping groove is cut with the bottom wall of the heat insulating material remaining, and the width of the piping groove corresponds to the outer diameter of the pipe and is not very wide. Cutting to a depth was particularly difficult and tended to cut deeper than necessary.
JP 2003-32836 A

  An object of the present invention is to provide a groove forming tool for a heat insulating material that can easily form a piping groove with respect to the heat insulating material, and a method for forming a pipe groove on the heat insulating material.

The invention according to claim 1 for solving the above-mentioned problem is rotated between the frame wall of the building wall and the finishing material by being rotated by a rotary tool and moved in a direction perpendicular to the axis of rotation. A foam resin heat insulating material groove forming tool for forming a groove for piping a pipe in a provided foam resin heat insulating material, wherein a plurality of blades capable of cutting the foam resin heat insulating material by the rotation are rotation axes. A plurality of blades are provided at predetermined intervals along the circumferential direction around the center, and the blade body is integrally formed with a contact housing that contacts the heat insulating material made of foamed resin at the time of forming the groove. The blade is formed in a triangular shape whose thickness gradually increases from the front end side to the rear end side for cutting the foamed resin heat insulating material first along the rotation direction, and the apex portion on the front end side has an acute angle. It is characterized in that it is a part.

According to the first aspect of the present invention , the groove forming tool is formed in a direction perpendicular to the rotational axis of the plurality of blade bodies in a state where the contact housing to which the plurality of blade bodies are attached is in contact with the surface of the heat insulating material. moving the each blade of the groove forming tool, by a sharp-pointed blade portion of the leading end is pressed sequentially by a predetermined force to the arc surface shape of the cutting surface of the middle cutting blade of each blade The surface to be cut of the heat insulating material is cut by a predetermined thickness by the portion, and the cut piece is discharged halfway through the gap between adjacent blades and discharged into the rear formed groove. Here, when the groove forming tool is rotated and bitten into the heat insulating material, the above-described action is exhibited from the beginning of cutting. On the other hand, the insulation material made of foamed resin is porous and has a small "apparent specific gravity" and is lightweight, and it can be easily cut with a small force. after the, Ru possible der forming grooves in the heat insulating material by rotating the groove forming tool. In addition, when the groove is formed, the abutment housing to which the plurality of blades are attached is formed with the groove formed while contacting the heat insulating material, so the depth of the formed groove is the same as the depth dimension of the blade. Thus, the depth of the formed groove can be made constant.

  According to a second aspect of the present invention, in the first aspect of the present invention, the rotation trajectory of each blade portion of the plurality of blade bodies is a groove that can be accommodated without a pipe being piped in the groove formed in the heat insulating material. It is characterized by a circle having a diameter corresponding to the width.

  According to invention of Claim 2, the rotation locus | trajectory of each blade part of the some blade body which comprises a groove formation tool of the diameter corresponding to the groove width which can be accommodated without the pipe | tube piped by the said heat insulating material coming out. Since it is a circle, when the groove forming tool is moved by rotating the groove forming tool with a rotary tool to form a piping groove in the heat insulating material, the width of the piping groove can be accommodated without the pipe coming out. It becomes a dimension. For this reason, the piping groove formed in the heat insulating material by moving the rotating groove forming tool can accommodate a pipe with a predetermined outer diameter as it is without requiring any or almost no cutting in the subsequent process. Piping groove forming work performed prior to piping is facilitated, and the efficiency of the piping work is increased.

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the depth dimension of the blade body corresponds to an outer diameter of a pipe piped to the heat insulating material.

  According to the invention of claim 3, a circle having a diameter corresponding to the groove width in which the rotation trajectory of each blade portion of the plurality of blade bodies constituting the groove forming tool can be accommodated without the pipe piped to the heat insulating material coming out. Since not only the width of the pipe groove formed in the heat insulating material but also its depth corresponds to the outer diameter of the pipe, if the pipe is accommodated in the pipe groove, it does not protrude from the wall surface of the heat insulating material. The entire pipe is accommodated in the pipe groove.

According to a fourth aspect of the present invention, in any one of the first to third aspects, an interval between adjacent blades in the plurality of blades is narrower than a width of the blades. .

According to invention of Claim 4 , since the space | interval of an adjacent blade body is narrower than the width | variety of a blade body, when a groove formation tool moves while rotating and forms a piping groove in a heat insulating material, The feed amount per rotation of the groove forming tool is reduced, the cutting amount is reduced, and the groove forming tool is smoothly rotated. Here, if the feed amount (biting amount) of the blade body is large during rotation of the groove forming tool, the heat insulating material is cut into small blocks, and the large cutting resistance causes the groove forming tool to form a regular groove. However, in the invention of claim 5, the above phenomenon is eliminated, and a correct piping groove along a normal groove forming line can be formed.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the number of the blades is five or more. For this reason, according to invention of Claim 5, since two or more blade bodies will always be in the state which contact | connected the to-be-cut surface of the heat insulating material, and a heat insulating material is cut, a cutting state is further stabilized.

  Moreover, invention of Claim 6 is a method of forming the groove | channel which pipes a pipe in the heat insulating material provided between the frame wall and finishing material of a building wall using the groove forming tool of Claim 1. Then, while rotating the groove forming tool, the groove forming tool is moved along a groove forming line to form a pipe groove having a width corresponding to the outer diameter of the pipe.

According to the invention of claim 6, in order for a plurality of blades to work equally with respect to cutting, that is, for each blade to cut the heat insulating material by the same amount, the cutting amount of one blade is reduced. However, as a whole, a predetermined cutting amount can be secured. Therefore, without vibration or the like generated during cutting, the rotating groove forming tool is smoothly, Ru can be formed pipe groove having a width corresponding to the outer diameter of the tube is plumbed to a heat insulating material.

In the groove forming tool for heat insulating material according to the present invention, the plurality of blade bodies capable of cutting the heat insulating material by rotation are circumferentially centered on the rotational axis centered on the casing that contacts the foamed resin heat insulating material at the time of groove forming A plurality of the blade bodies are formed along the rotational direction, and the thickness gradually increases from the front end side to the rear end side, which cuts the foamed resin thermal insulation material first along the rotation direction in a cross-sectional view. It has a triangular shape, and the apex portion on the tip side is an acute-angled blade portion . For this reason, by moving the groove forming tool in a direction perpendicular to the rotational axis , each blade body of the groove forming tool has an arcuate surface to be cut whose sharp edge at the tip is being cut. By sequentially pressing with a predetermined force, the cutting surface of the heat insulating material is cut by a predetermined thickness by the blade portion of each blade body, and a plurality of cutting pieces are formed from gaps between adjacent blade bodies. When the cutting piece storage space is temporarily stored and the cutting piece storage space is full, the cutting piece is substantially half rotated and then cut. It is discharged into the groove immediately after cutting at the open part facing the surface. Therefore, the groove | channel which accommodates a pipe | tube in the heat insulating material made from foamed resin can be formed easily. The above-described action is a case where the groove forming tool is rotated and bitten into the heat insulating material, but when the groove forming tool stopped is bitten into the heat insulating material, the cutting piece storage space is Since the heat insulating material cut into a substantially cylindrical shape is accommodated almost integrally with each blade body, the heat insulating material cut into a substantially cylindrical shape remains as it is, and the cutting piece has been rotated almost half from the beginning of cutting. Later, it is discharged into the groove immediately after formation facing the surface to be cut of the heat insulating material.

  Further, when the rotation trajectory of each blade portion of the plurality of blade bodies is a circle having a diameter corresponding to the groove width that can be accommodated without the pipe piped to the heat insulating material being pulled out, the groove forming tool is formed by the rotary tool. When the groove forming tool is moved while rotating the pipe to form a pipe groove in the heat insulating material, the width of the pipe groove becomes a size that can be accommodated without the pipe coming out. For this reason, the piping groove formed in the heat insulating material by moving the rotating groove forming tool can accommodate a pipe with a predetermined outer diameter as it is without requiring any or almost no cutting in the subsequent process. Piping groove forming work performed prior to piping is facilitated, and the efficiency of the piping work is increased.

Hereinafter, the present invention will be described in more detail with reference to the best mode. FIG. 1 is a perspective view of a groove forming tool T according to the present invention, FIG. 2 is a plan view of the groove forming tool T in a state in which the wide base 2c of each blade body 2 is omitted, and FIG. FIG. 3 is a sectional view taken along line XX in FIG. 2. First, the configuration of the groove forming tool T will be described in detail with reference to FIGS. 1 to 3, and then the indoor side of the outer wall (frame wall) M ₁ of the building wall M using the groove forming tool T. A method of forming the piping groove G ₁ in the heat insulating material A installed in the above will be described.

The groove forming tool T is hard, has predetermined elasticity and heat resistance, and is molded by injection molding using a thermoplastic resin that can be injection molded, such as PC (polycarbonate), PPS (polyphenylene sulfide), etc. A plurality of (five in the embodiment) blade bodies 2 around the rotation axis C are circumferentially arranged on one surface of the disk-shaped contact housing 1 that contacts the surface of the heat insulating material A during groove cutting. The grip shaft 3 is integrally formed on the other surface of the contact housing 1 so as to be concentric with the rotation axis C. is there. Each blade body 2 has the same shape, has a predetermined width (U) and a predetermined height (depth dimension) [H], and has a substantially acute isosceles triangular cross section. is doing. Each blade body 2 has a substantially acute angle isosceles triangular shape with an apex of an acute angle as a blade portion 2a, and only the blade portion 2a is a semicircular arc surface of the heat insulating material A during groove cutting, as shown in FIG. in contact with the cutting surface a ₁ in which the Jo, the remaining outer surface 2b so as not to contact said to be cutting surface a _1, are arranged substantially along the circumferential direction. The front end surface 2 d of the blade body 2 is formed in a planar shape perpendicular to the height direction of the blade body 2. Further, the interval (E) of the gap 4 between the adjacent blade bodies 2 is far greater than the width (U) of the blade body 2 in order to reduce the amount of one-time cutting of the blade body 2 during rotary cutting. It is small (narrow). Further, in order to increase the binding force of the blade body 2 to the contact housing 1, the base portion 2 c of the blade body 2 is formed in a large size similar to the cross-sectional shape of the blade body 2. The space surrounded by the plurality of blades 2 arranged substantially along the circumferential direction functions as a cutting piece storage space 5 for temporarily storing the cutting pieces. The reason why the cross-sectional shape slightly changes from the proximal end to the distal end (free end) of the blade body 2 is that when the blade body 2 of the groove forming tool T is injection molded. The “draft angle” is not particularly meaningful in relation to cutting.

Further, the rotation trajectory of the blade portion 2a of each blade body 2 is a circle having a diameter (F) corresponding to the groove width that can be accommodated without the flexible electric wire pipe P piped to the heat insulating material A coming out. Each blade body 2 is provided integrally with the contact housing 1. Thus, the pipe grooves G ₁ of width formed in the heat insulating material A (W), since conduit P for accommodating the pipe is required not come out, the maximum outer diameter of the conduit P (F ') It corresponds. Here, in order to “can be accommodated in the piping groove G ₁ formed in the heat insulating material A without the flexible electric wire P coming out”, the groove width (W) of the piping groove G ₁ is set to be flexible electric wire. This includes not only the case where it is the same as the maximum outer diameter (F ′) of P but also cases where it is slightly larger and smaller than the maximum outer diameter (F ′). When the piping groove G ₁ is formed in the heat insulating material A made of foamed resin, the inner wall surface of the piping groove G ₁ is not smooth but is uneven, so the groove width (W) of the piping groove G ₁ Is slightly larger than the maximum outer diameter (F ′), the conduit P can be accommodated, and since the heat insulating material A made of foamed resin is elastically deformed, the groove width (W) of the piping groove G ₁ is small. The conduit P can be accommodated even if it is slightly smaller than the maximum outer diameter (F ′).

On the other hand, the height (depth dimension) [H] of each blade body 2 is made to correspond to the maximum outer diameter (F ′) of the flexible conduit P that is piped to the heat insulating material A. Here, “corresponding” with respect to the height (depth dimension) [H] of each blade body 2 means that the flexible conduit P is inserted into the piping groove G ₁ formed in the heat insulating material A, This means that one end can be connected to a device such as the switch box B without any trouble, and the height (depth dimension) [H] of each blade body 2 and the maximum outer diameter (F ′) of the flexible conduit P Does not necessarily mean that they are the same. In FIG. 2, a two-dot chain line indicates a circumscribed circle of a connection portion between the blade portion 2 a of each blade body 2 and the base portion 2 c. In FIG. 1, Q ₁ indicates the rotation direction of the groove forming tool T, and in FIG. 3, 7 indicates a meat stealing portion formed in the gripped portion 3.

Next, a method of forming the piping groove G ₁ in the heat insulating material A installed on the indoor side surface of the housing wall M ₁ of the building wall M using the groove forming tool T described above will be described. 4 is a perspective view showing a state in which the piping groove G ₁ is formed along the vertical direction in the heat insulating material A installed on the indoor side surface of the housing wall M ₁ by the groove forming tool T. FIG. is a cross-sectional view of a plurality of blade body 2 portion of the groove forming tool T in the middle forming the pipe groove G _1, FIG. 6 is a similar longitudinal sectional view. The heat-insulating material A made of foamed resin is porous and has a small “apparent specific gravity”, is lightweight, has excellent heat insulating properties and sound-absorbing properties, and can be easily cut with a small force. 4 to 6, the gripping shaft 3 of the groove forming tool T is inserted and held in the tool gripping portion 31 at the tip of the rotary tool K, and the rotating groove forming tool T is bitten into the heat insulating material A. After that, the rotating groove forming tool T is linearly moved from the upper side to the lower side in a state where the contact housing 1 is in contact with the surface of the heat insulating material A.

As a result, as shown in FIGS. 5 and 6, each blade body 2 of the groove forming tool T has its tip in a state where the contact housing 1 of the groove forming tool T is in contact with the surface of the heat insulating material A. of by blade portion 2a is pressed with a predetermined force to the arc surface shape of the cutting surface a ₁ in the middle of cutting, by one the cutting surface a ₁ is predetermined thickness of the heat insulating material a by the cutting portion 2a of the blade 2 The cut pieces (not shown) are temporarily cut from the gaps 4 between the adjacent blades 2 in a cut piece storage space 5 formed by being surrounded by the plurality of blades 2. At the same time, when the cutting piece storage space 5 is full, the cutting piece is an open portion of the piping groove G ₁ immediately after the formation facing the surface to be cut A ₁ after the groove forming tool T has substantially rotated half a turn. 6 (see FIG. 5) is released to the periphery. In this case, the interval (E) between the blades 2 adjacent to each other is much smaller than the width (U) of the blades 2 of the groove forming tool T, so the arrow Q ₂ while the groove forming tool T rotates. is the feed rate of the blade 2 per revolution of the groove forming tool T at the time of forming the pipe groove G ₁ to the heat insulating material a linearly move in the direction (encroaching amount) is small, the amount of cutting is reduced . For this reason, when the groove forming tool T rotates smoothly and the feed amount of the blade body 2 per rotation of the groove forming tool T is large, the groove forming tool T has two points in FIG. It is possible to effectively prevent shifting in the direction Q ₂ ′ as indicated by the chain line. As a result, it is easy to form a straight pipe groove G _1. Further, since the piping groove G ₁ is formed in a state where the contact housing 1 is in contact with the surface of the heat insulating material A, the depth (D) of the formed piping groove G ₁ is necessarily constant. . Furthermore, including this embodiment, when the number of the blade bodies 2 is five or more, the two or more blade bodies 2 are always in contact with the cut surface A ₁ of the heat insulating material A and the heat insulating material A. Is cut. Therefore, since the rotation of the groove forming tool T is stabilized, the cutting state is further stabilized.

Then, as shown in Figure 7, the groove forming tool T reaches the forming the lower end, pull out the groove forming tool T from the part of the heat insulating material A, completing the groove forming operation of the pipe groove G _1. Thus, the width (W) of the piping groove G ₁ formed in the heat insulating material A in the vertical direction is the diameter (F) of the circle that is the rotation locus of the blade portion 2 a of each blade body 2 of the groove forming tool T. there are, together correspond to the maximum outer diameter of the flexible conduit P (F ') (the "corresponding" in this case means "same"), the depth of the pipe groove G ₁ (D ) Is the same as the height (depth dimension) [H] of each blade body 2 of the groove forming tool T, and corresponds to the maximum outer diameter (F ′) of the flexible conduit P. FIG. As shown in FIG. ₄ , the flexible conduit P can be accommodated in the piping groove G1 as it is. Here, "as it is flexible conduit P can be accommodated piping pipe grooves G _1", without having to move the flexible conduit P contained piping in the piping groove G ₁ is the width direction, moreover the piping groove It refers to a flexible conduit P while being accommodated piping G _1, it can be connected to the switch box B housed in a box accommodating groove G ₂ insulation a. Further, in the state in which the pipe groove G ₁ having the depth (D) is formed in the heat insulating material A, the bottom wall portion 11 remains at the bottom of the pipe groove G ₁ , and the front end surface of the blade body 2 of the groove forming tool T. Is flat, the bottom wall portion 11 is formed in a flat shape. Therefore, gone undulating insert pipe has been conduit P the pipe groove G _1, pipework is facilitated.

Groove forming the above-described example, the groove forming tool T during rotation by bite the insulation material A, in order to form a pipe grooves G _1, cutting the above-described effect is achieved from the cutting start. On the other hand, since the heat insulating material A made of foamed resin is porous and lightweight, the groove forming tool T can easily bite the blades 2 into the heat insulating material A while being stopped. And after making the groove formation tool T bite into the heat insulating material A, it is also possible to rotate the groove forming tool T and cut the heat insulating material A. In this case, in the cutting piece storage space 5 of the groove forming tool T, since the heat insulating material A cut into a substantially cylindrical shape is accommodated substantially integrally with each blade body 2, the cutting piece from the beginning of cutting. Is discharged into the groove immediately after formation facing the surface to be cut of the heat insulating material after being substantially half rotated.

Next, when the heat insulating material A is cut out in a square shape corresponding to the switch box B accommodated by using a cutting tool such as a knife at the position indicated by the two-dot chain line in FIG. 7, it is connected to the pipe groove G ₁ . box housing groove G ₂ is formed. Then, the lower end portion of the flexible conduit P on the side wall 32 of the switch box B in the connected state via the coupling 33, the pipe grooves G ₁ and box accommodation groove G _2, the flexible conduit P and the switch box B Each. Thus, the piping groove G ₁ is formed by the groove forming tool T having an outer diameter and a height (depth dimension) corresponding to the maximum outer diameter (F ′) of the flexible conduit P accommodated therein. Therefore, the flexible electric pipe P can be accommodated in the piping groove G ₁ by only forming the piping groove G ₁ with the groove forming tool T and without performing any post-processing. Therefore, the process required for piping of the flexible electric pipe P including the process of forming the piping groove is reduced, and the efficiency of the piping work is increased. In addition, in FIG. 9, 12 shows the electric wire accommodated in the flexible electric wire pipe P, and the lower end part was pulled out.

Next, put a veneer on the surface of the heat insulating material A, although terminate the construction of the building wall M, or exit the flexible conduit P accommodating piping pipe grooves G ₁ is, or becomes likely exit, wherein in order to prevent the hindered to put a veneer, implanted tube extraction preventer J adiabatic material a in a state straddling the pipe groove G _1. As shown in FIGS. 8 and 10, the tube extraction preventing device J is formed of a corrugated structure of the preventing device main body 34 having elasticity along the longitudinal direction so that it can correspond to piping grooves having different groove widths. At both ends in the longitudinal direction, contact pieces 35 are bent and formed integrally with each other, and a pair of contact pieces 35 on both ends of the main body 34 of the preventer body 34 are provided in the depth direction. The piercing body 36 is integrally formed. At the distal end portion of the piercing body 36, a first retaining piece 36a is formed at a predetermined angle outside the piercing body 36, and the width of the distal end portion of the piercing body 36 is wider toward the proximal end side. A second retaining piece 36b is integrally formed. The first and second retaining pieces 36a and 36b can reliably prevent the tube withdrawal prevention tool J pierced by the heat insulating material A from being pulled out. The decorative board can be adhered to the surface of the heat insulating material A by reliably preventing it from coming out of G ₁ .

In addition, the piping groove G ₁ formed in the heat insulating material A is not limited to a linear shape along the vertical direction, and when the piping groove along the horizontal direction or the flexible electric pipe P is bent, Correspondingly, a curved pipe groove such as an arc shape can be formed in the heat insulating material A.

  Further, regarding the number of the plurality of blades constituting the groove forming tool, five or more blades are preferable from the viewpoint of stability during cutting as described above, but the number is not limited to five.

  In addition, regarding the material of the groove forming tool, the above-described thermoplastic resin is preferable because the heat insulating material that is a material to be cut is made of foamed resin and the cutting resistance is small, but a metal groove forming tool is also selected. obtain.

It is a perspective view of groove formation tool T concerning the present invention. It is a top view of the groove | channel formation tool T of the state which abbreviate | omitted the wide base 2c of each blade body 2. FIG. FIG. 3 is a sectional view taken along line XX in FIG. 2. Is a perspective view showing a state of forming a pipe grooves G ₁ in the installed heat insulating material A on the surface of the interior side of the skeleton wall M ₁ along the vertical direction by the groove forming tool T. It is a cross-sectional view of a plurality of blade body 2 portion of the groove forming tool T in the middle forming the pipe groove G _1. It is the same longitudinal cross-sectional view. Is a perspective view showing a state in which the pipe grooves G ₁ heat insulating material A is formed in the vertical direction. It is a perspective view showing a state in which each flexible conduit P and the switch box B in the heat insulating material A into the pipe grooves G ₁ and box accommodation groove G ₂ is accommodated. It is a cross-sectional view of the pipe groove G _1. In a state in which escape is prevented by a pipe extraction preventing device J, it is a cross-sectional view of a state in which the flexible conduit P is accommodated in the pipe groove G _1.

A: Insulation
C: Rotation axis of groove forming tool
D: Depth of piping groove
E: Distance between the blades of the groove forming tool
F: Diameter of the circle that is the rotation trajectory of the blade portion of each blade body of the groove forming tool F ′: Maximum outer diameter of the flexible conduit G ₁ : Pipe groove
H: Blade height (depth dimension)
K: Rotary tool
M: Building wall M ₁ : Building wall
P: Flexible conduit Q ₁ : Direction of rotation of groove forming tool Q ₂ : Direction of movement of groove forming tool
T: Groove forming tool
U: Blade width
W: Width of piping groove
1: Contact housing
2: Blade 2a: Blade part of blade

Claims (6)

A groove that pipes the pipe is formed in the insulation material made of foamed resin provided between the building wall of the building wall and the finishing material by being rotated by the rotary tool and moved in a direction perpendicular to the axis of rotation. A groove forming tool for a heat insulating material made of foam resin,
The plurality of blade bodies capable of cutting the foamed resin heat insulating material by the rotation are arranged at predetermined intervals along a circumferential direction centering on the rotation axis centered on a contact housing that contacts the foamed resin heat insulating material when forming a groove. There are several
The blade body has a triangular shape in which the wall thickness gradually increases from the front end side to the rear end side, which cuts the foamed resin heat insulating material first along the rotation direction in a cross-sectional view, A groove forming tool for a foamed resin heat insulating material, wherein the apex portion on the side is an acute-angled blade portion . The rotation trajectory of each blade portion of the plurality of blade bodies is a circle having a diameter corresponding to a groove width that can be accommodated without a pipe being piped in a groove formed in the heat insulating material. 2. A groove forming tool for a heat insulating material made of foamed resin according to 1. The depth dimension of the said blade body respond | corresponds to the outer diameter of the pipe | tube piped to the said foamed resin heat insulating material, The groove forming tool for foamed resin heat insulating materials of Claim 1 or 2 characterized by the above-mentioned. The groove forming tool for a foamed resin heat insulating material according to any one of claims 1 to 3, wherein an interval between adjacent blade bodies in the plurality of blade bodies is narrower than a width of the blade body. The groove forming tool for a foamed resin heat insulating material according to any one of claims 1 to 4, wherein the number of the blade bodies is five or more. A method of forming a groove for piping a pipe in a foamed resin heat insulating material provided between a building wall of a building wall and a finishing material using the groove forming tool according to claim 1,
While forming the groove forming tool, the groove is moved along the groove forming line to form a pipe groove having a width corresponding to the outer diameter of the pipe. Method.

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