JP2020084677A - Metal fitting for fixing substrate material, and fixing construction method of interior wall substrate material - Google Patents

Abstract

To provide a metal fitting for fixing a substrate material capable of tightly fixing an interior wall substrate material constituting an interior wall to a beam material formed of a shaped steel even in a narrow space, and to provide a fixing construction method of an interior wall substrate material using the metal fitting for fixing the substrate material.SOLUTION: A metal fitting 1 for fixing a substrate material fixes an interior wall substrate material 30 constituting an interior wall 3 to a beam material 2 formed of a shaped steel. The metal fitting 1 comprises: a fitting portion 11 constituted by forming a cut groove 11a fitting to the beam material 2 respectively in a pair of second plate pieces 112 protruding in the same direction substantially perpendicular to a first plate piece 111 from both side end portions of the first plate piece 111 formed to be narrower toward an upper end; a support portion 12 into which the interior wall substrate material 30 is fitted in a direction perpendicular to the cut groove 11a, to be supported; and an adjusting bolt 13 connecting the first plate piece 111 and the support portion 12 and adjusting going-in and going-out of the interior wall substrate material 30 fitted in the support portion 12 in an out-of-plane direction. The cut groove 11a is formed at an upper end portion side of the second plate piece 112.SELECTED DRAWING: Figure 2

Description

The present invention relates to a base material fixing metal fitting for fixing an inner wall base material forming an inner wall to a beam material formed of shaped steel, and a method for fixing and fixing an inner wall base material using the base material fixing metal fitting.

Conventionally, there has been invented a metal fitting that constitutes an inner wall and can fix a wooden base frame that is framed in a rectangular shape to a horizontal member such as a steel beam. For example, in the invention described in Patent Document 1, a metal fitting body formed in a groove shape into which an upper end portion of a wooden base frame is fitted, and a horizontal member made of H-shaped steel in two parallel plate pieces. The invention discloses a fixing bracket having fixing members each having a meshing portion that meshes with the lower flange of the fixing bracket, and an adjusting bolt that connects the fitting main body and the fixing member. Rotating the adjusting bolt of the fixing bracket from the indoor side. By doing so, it is possible to adjust the fitting body and the wooden base frame fitted in the fitting body in and out of the plane.

JP-A-11-93302

By the way, in a steel-framed building, in order to resist a horizontal force acting on the building, a bar-shaped horizontal brace may be installed on the floor beam to increase the rigidity of the floor beam. Normally, the horizontal brace is fixed to the lower flange of the floor beam by bolts and nuts at both ends in the longitudinal direction. In some cases, the gusset plate and shaft of the brace interfere with the upper end of the fixing member, so that the fixing bracket cannot be installed at a desired position. Usually, in such a case, sliding the main body of the fixing bracket along the wooden base frame in the direction away from the horizontal brace can avoid the interference between the horizontal brace and the fixing bracket. If the joint between the beam and the orthogonal beam, or the joint between the floor beam and the diaphragm protruding from the column is close to the fixing bracket, the gusset plate or bolts/nuts for the joint fixed to the flange of the floor beam. The obstacle interferes with the fixing member and the fixing member cannot be moved horizontally to a desired position. Furthermore, when installing horizontal braces on floor beams, the ceiling pocket tends to be a space with a tight space for horizontal braces, wiring, and piping, and even in such a narrow space, a small gap can be used to make a wooden base frame. There was a need for a fixing bracket that could be fixed stably.

Therefore, the present invention has been made in view of the above-mentioned problems, and it is possible to stably fix the inner wall base material forming the inner wall to the beam material formed of shaped steel even in a narrow space. An object of the present invention is to provide a base material fixing bracket that can be used, and a method for fixing an inner wall base material using the base material fixing bracket.

A first base material fixing metal fitting of the present invention is a plate-shaped inner wall installed on a back surface of an inner wall board material forming a wall surface of an inner wall on a beam material formed of a shaped steel having a flange and a web orthogonal to each other. A base material fixing bracket for fixing the base material, which protrudes in the same direction at substantially right angles to the first plate piece from both side ends of the first plate piece formed narrower toward the upper end. A fitting portion formed by forming a notch groove in each of the pair of second plate pieces, the notch groove extending from the leading edge of the second plate piece to the first plate piece side and fitted to the flange, and is orthogonal to the notch groove. A support part that fits and supports the upper end portion of the inner wall base material in a direction, and connects and disconnects the first plate piece and the support part to the out-of-plane direction of the inner wall base material that is fitted in the support part. And an adjustment bolt for adjusting the cutout groove, the cutout groove being formed on the upper end side of the second plate piece.

In the second base material fixing metal fitting of the present invention, the cut groove uniformly inclines a pair of end surfaces of the cut facing each other in a direction approaching each other from the base end of the cut toward the tip. It is characterized by

In the third base material fixing fitting of the present invention, the notch groove is formed such that the width of the tip end portion of the notch is narrower than the plate thickness of the flange, and the width of the base end portion of the notch is substantially equal to the plate thickness of the flange. The feature is that they are formed identically.

In a fourth base material fixing metal fitting of the present invention, the adjustment bolt is configured such that a tip of the bolt is directed toward an opening direction of the cut groove, and the support is positioned closer to a tip side of the adjustment bolt than the first plate piece. It is characterized in that a retaining portion for preventing the portion from falling off from the adjustment bolt is formed at the tip of the bolt.

A method of fixing a wall base material of the present invention is an inner wall base material for fixing the inner wall base material to a beam member made of H-shaped steel, using the base material fixing metal fitting according to any one of the first to fourth aspects. A method of fixing a material, comprising: fixing the upper end portion of the plate-shaped inner wall base material by fitting it into the support portion, driving the first plate piece, and fitting the cut groove into the flange. At the same time, after rotating the adjusting bolt to adjust the support part and the inner wall base material fitted into the support part in and out of the plane, the lower end of the inner wall base material is used as a floor base material. It is characterized by fixing.

According to the first base material fixing bracket of the present invention, the first plate piece is formed to have a narrow width toward the upper end, and the notch groove fitted to the flange is formed at the upper end portions of the pair of second plate pieces. Therefore, even if the vicinity of the flange of the beam is a narrow space, the base material fixing bracket can be fixed to the beam without the upper ends of the first plate piece and the second plate piece interfering with other members. You can Further, if the upper end portion of the narrow first plate piece is driven by a hammer or the like, the notch groove can be fitted into the flange, and compared with the case where the first plate piece has the same width over the entire height. Since the placement position of the first plate piece can be kept constant to some extent, the inclination of the metal fitting itself can be suppressed and the base material fixing metal fitting can be stably fixed to the beam material. Then, when the fitting portion is fitted to the flange, the area of the beam member of the first plate piece in the weak axis direction (direction orthogonal to the web) becomes smaller than that of the conventional fitting, so that the fitting portion It is possible to suppress the deformation and twist of the metal fitting itself when the rotational moment force acts on the inner wall base material and stabilize the building.

According to the second base material fixing fitting of the present invention, the cut groove has the pair of end surfaces of the cut facing each other uniformly inclined at the same angle in a direction approaching each other from the base end of the cut toward the tip. Therefore, when the first plate piece is driven with a hammer or the like and the notch groove is fitted to the flange, load is evenly applied to the opposite end faces of the notch groove, and both end faces are uniformly deformed while the flange is deformed. Since the fitting portion is not inclined, the fitting and fitting of the flange to the flange can stabilize the building and passage of the inner wall base material supported by the supporting portion.

According to the third base material fixing fitting of the present invention, the notch groove is formed such that the distance of the tip end on the open side of the notch is smaller than the plate thickness of the flange, and the width of the base end part of the notch is the plate thickness of the flange. Since it is formed almost the same as the above, when the fitting part is hammered into the flange of the pillar material, the tip side of the notch groove can more firmly clamp the flange, and the base material fixing bracket is removed from the beam material. Can be prevented.

According to the fourth base material fixing fitting of the present invention, since the adjustment bolt has the retaining portion at the tip portion for preventing the support portion from falling off the adjustment bolt, the adjustment bolt is rotated to the support portion. Even if the insertion/removal of the fitted inner wall base material is adjusted, the support portion and the inner wall base material do not fall off from the adjustment bolt and the connection with the fitting portion is not accidentally released.

According to the fixing method of the inner wall base material of the present invention, the inner wall base material is fitted into the support portion of the base material fixing metal fitting, and the fitting portion is fitted into the flange to adjust the inward and outward movement of the inner wall base material. After that, since the lower end of the inner wall base material is fixed to the floor base material, it is possible to form an inner wall with a high construction accuracy in which the construction and passage of the inner wall base material are adjusted.

Sectional drawing which shows the condition which installed the inner wall base material in the beam material. FIG. 2 is an enlarged sectional view of a part A of FIG. The front view which shows a base material fixing metal fitting. The top view which shows a base material fixing metal fitting. The disassembled perspective view of a base material fixing metal fitting. The perspective view which shows a pair of end surface of a notch groove. The top view which shows the base material fixing metal fitting which has the adjustment bolt which formed the retaining part. The perspective view which shows an inner wall base material. Sectional drawing which shows the condition which fits a base material fixing metal fitting to the flange of a beam material. Sectional drawing which shows the movement of a support part at the time of carrying out rotation operation of the adjustment bolt. The front view which shows the condition which installed the base material fixing metal fitting in the beam material.

Hereinafter, the best embodiment of the base material fixing bracket will be described with reference to the drawings. As shown in FIG. 1, the base material fixing metal fitting 1 of the present application is used when fixing the inner wall base material 30 forming the inner wall 3 to the lower flange 21 of the beam material 2 mainly made of H-shaped steel. It is a metal fitting. The base material fixing metal fitting 1 of the present application can be applied to any other shaped steel as long as the beam 2 has a flange 21 and a web 22 which are orthogonal to each other. The case of installation on the beam member 2 will be described.

As shown in FIG. 2, the base material fixing bracket 1 includes a fitting portion 11 having a cut groove 11a fitted to the lower flange 21 of the beam 2 and an inner wall base material 30 in a direction orthogonal to the cut groove 11a. The support portion 12 that fits and supports the upper end portion is connected to the fitting portion 11 and the support portion 12, and the support portion 12 and the inner wall base material 30 fitted into the support portion 12 are adjusted in the out-of-plane direction. The adjusting bolt 13 is provided.

As shown in FIGS. 3 and 5, the fitting portion 11 is a member made of one steel plate and having a slight spring property, and has a flat plate-shaped first plate piece 111 that is narrowed toward the upper end. , A pair of second plate pieces 112 projecting from both side ends of the first plate piece 111 in the same direction at substantially right angles to the first plate piece 111, and a pair of second plate pieces 112 on the side of the first plate piece 111. Of the pair of third plate pieces 113 projecting from the lower end of the pair toward the first plate piece 111, the lower end portions of the pair of second plate pieces 112 and the lower end portions of the pair of third plate pieces 113, respectively, in directions close to each other. A pair of fourth plate pieces 114, which are formed by bending and are placed on the support portion 12, are provided.

As shown in FIG. 3 and FIG. 5, the first plate piece 111 is a substantially triangular plate piece formed to have a narrow width toward the upper end, and penetrates in the plate thickness direction at substantially the center of the lower end in the width direction. The first through hole 111a is formed, and the adjusting bolt 13 can be inserted into the first through hole 111a. In the pair of second plate pieces 112, since the upper end portions of the first plate pieces 111 are formed narrow, the upper end portions incline toward each other, and the first plate pieces 112a to 112c extend from the respective tip edges 112a. A cut groove 11a is formed in which a cut is made toward the 111 side. As shown in FIG. 6, the cut groove 11a is formed by inclining end surfaces 11b of the cut facing each other at the same angle α in a direction in which they approach each other from the base end of the cut toward the tip on the open side. The width W1 of the portion is formed narrower than the plate thickness t of the lower flange 21 of the beam 2, and the width W2 of the base end portion is formed to be substantially the same as the plate thickness t of the lower flange 21. Further, as shown in FIGS. 3 and 5, the lower end portion of the second plate piece 112 projects downward from the lower end portion of the first plate piece 111, and the third plate piece 113 is protruded from this projected portion. A gap is formed between the lower end of the first plate piece 111 and the upper end surface of the fourth plate piece 114 when extending from the first plate piece 111 side as viewed from the first plate piece 111 side. ..

As shown in FIGS. 2 and 5, the support portion 12 includes a first support portion 121 formed by bending a steel plate into a substantially L shape, and a metal plate having a thickness smaller than that of the first support portion 121 formed into a substantially L shape. It is configured by joining the second support portion 122 and. The first support portion 121 is one plate piece that forms the corner portion 121a, and a substantially central portion of the first joint piece 12a that is joined to the second support portion 122 and the other plate piece that forms the corner portion 121a. Of the inner wall base material 30 when the inner wall base material 30 is fitted into the support portion 12 when the inner wall base material 30 is fitted into the support piece 12 and the rising pieces 12b folded back to the corner portion 121a side at substantially right angles. It is formed by two first contact pieces 12c that contact the surface. The rising piece 12b is formed with a second through hole 12d penetrating in the plate thickness direction and having an internal thread on the inner peripheral surface. The adjusting bolt 13 can be inserted into the second through hole 12d. .. In addition, the first contact piece 12c is formed by slightly bending a substantially central portion in the height direction toward the first joint piece 12a, and when the inner wall base material 30 is fitted into the support portion 12, a second contact piece 12c described later is formed. The inner wall base material 30 can be elastically sandwiched between the contact piece 12f.

The second support portion 122 is one plate piece that forms the corner portion 122a, and the second joint piece 12e that is joined to the first joint piece 12a of the first support portion 121, and the other one that forms the corner portion 122a. The second contact piece 12f is a plate piece and comes into contact with the other plate surface of the inner wall base material 30 when the inner wall base material 30 is fitted into the support portion 12. The second joint piece 12e includes a placing portion 12g in which a substantially central portion in the width direction is raised for placing the first joining piece 12a, both sides in the width direction of the placing portion 12g, and the placing portion 12g. And a raised portion 12h that raises a position spaced apart and sandwiches the fourth plate piece 114 of the fitting portion 11 between the mounting portion 12g and the second contact piece 12f. A plurality of screw holes 12i for inserting screws for fixing the inner wall base material 30 to the support portion 12 are formed. The second contact piece 12f is a member that directly contacts the inner wall board material 31 when the inner wall board material 31 forming the wall surface of the inner wall 3 is fixed to the inner wall base material 30, as shown in FIG. The inner wall board material 31 is formed of a thin metal plate so as not to tilt, and the thickness thereof can be formed to be, for example, about 0.4 mm.

When connecting the fitting portion 11, the first supporting portion 121, and the second supporting portion 122 configured as described above, first, the first plate piece 111 of the fitting portion 11 is connected to the corner portion of the second supporting portion 122. The fourth plate piece 114 is arranged between the mounting portion 12g and the raised portion 12h so that the fitting portion 11 is mounted on the second supporting portion 122, and then the first supporting portion 122a. The first contact piece 12a of 121 is placed on the upper side of the placing piece 12g with the tip of the first joining piece 12a facing the second support portion 122 side, and the first abutting piece 12a and the placing piece 12g are shown in FIG. As shown in FIG. 5, they can be joined by caulking (12j) by burring from above. As described above, the first support portion 121 and the second support portion 122 are overlapped and coupled to each other, whereby the fitting portion 12k for fitting the inner wall base material 30 shown in FIG. 2 is formed.

As shown in FIGS. 3 to 5, the adjusting bolt 13 is a bolt having an external thread formed on the outer peripheral surface thereof, and a locking hole 13a for locking a tool such as an electric screwdriver is formed on the end surface on the head side. Has been done. The adjusting bolt 13 connects the fitting portion 11 and the support portion 12 with the tip of the bolt directed toward the opening direction of the cut groove 11a, and is inserted into the first through hole 111a from the first plate piece 111 side. Next, the nut 14 and the second through hole 12d formed in the rising piece 12b of the first support portion 121 are screwed in order, whereby the fitting portion 11 and the support portion 12 can be connected and fixed. The nut 14 is for preventing the adjustment bolt 13 from coming off from the first plate piece 111, and is fixed so as not to rotate with respect to the adjustment bolt 13. Therefore, when the adjustment bolt 13 is rotated, the nut 14 is rotated. The nut 14 also rotates in the same direction, and the nut 14 does not rotate in the tightening direction to prevent the rotation of the bolt. Therefore, as shown in FIG. 10, when the tool 4 is inserted into the locking hole 13a of the adjusting bolt 13 and the adjusting bolt 13 is rotated, only the rising piece 12b screwed into the adjusting bolt 13 is moved along the bolt shaft. It is possible to slide and move the entire support portion 12 in the bolt axial direction of the adjustment bolt 13. Note that, in the illustrated example, the shape of the locking hole 13a is a cross hole, but other shapes may be used as long as the tool 4 that can rotate the adjustment bolt 13 can be locked. Further, as shown in FIGS. 7(a) and 7(b), the adjustment bolt 13 is provided with a cap 13a on the tip end thereof or a protrusion/recess portion 13b formed in the radial direction of the bolt to form the retaining portion 13b. It is possible to prevent the lifting piece 12b from falling off the adjusting bolt 13.

Next, a construction method of installing the inner wall base material 30 on the flange 21 of the beam 2 using the base material fixing bracket 1 will be described. The inner wall base material 30 installed on the beam 2 is a plate-like member fixed to the back side surface of the inner wall board material 31 forming the wall surface of the inner wall 3, as shown in FIGS. It is formed by fixing a heat insulating material 33 such as glass wool inside a rectangular frame 32 in which the frame material 3a and the left and right vertical wooden frame materials 3b are assembled in a rectangular shape. First, the inner wall base material 30 is erected on the upper part of the floor base material F1 formed on the foundation F shown in FIG. 1, and as shown in FIG. The inner wall base material 30 is fixed to the base material fixing bracket 1 by fitting it into the fitting portion 12k of the material fixing bracket 1 and driving a screw into the crossbar frame member 3a from the second contact piece 12f side. The base material fixing bracket 1 is installed at regular intervals along the width direction of the inner wall base material 30 according to the shape of the inner wall base material 30.

Then, as shown in FIG. 9, the tip end of the notch groove 11a of the base material fixing bracket 1 on the open side is brought into contact with the widthwise tip of the lower flange 21 of the beam member 2, and the tip of the flange 21 is cut into the notch groove. The surface of the first plate piece 111 opposite to the second plate piece 112 is driven by a hammer (not shown) until the base material fixing metal fitting 1 is fitted and fixed to the beam 2. At this time, as described above, the first plate piece 111 is formed narrower toward the upper end portion, and the notch groove 11a is formed in the upper end portion of the second plate piece 112. As shown, even if the space for installing the base material fixing bracket 1 is small, the base material fixing bracket does not interfere with the first plate piece 111 and the second plate piece 112 of the fitting portion 11 with other members. 1 can be fixed to the beam 2. Further, as described above, the cut groove 11a is formed by inclining the pair of end faces 11b of the cut shown in FIG. 6 that face each other at the same angle α in the directions approaching each other from the base end of the cut toward the tip. When the fitting portion 11 is driven with a hammer, the end surfaces 11b of the cut groove 11a facing each other are fitted into the flange 21 while being uniformly deformed. Therefore, only one of the pair of end faces 11b is not significantly deformed, and the base material fixing bracket 1 can be fixed to the flange 21 in a stable state without tilting. Further, the width W1 of the tip end on the open side of the cut is formed to be narrower than the plate thickness t of the flange 21, and the width W2 of the base end of the cut is formed to be substantially the same as the plate thickness t of the flange 21. The flange 21 can be firmly sandwiched by the tip portion of the cut groove 11a, and the base material fixing metal fitting 1 can be prevented from falling off the beam material 2.

Then, as shown in FIG. 11, by making the first plate piece 111 of the base material fixing bracket 1 narrow toward the upper end portion, the first plate piece 111 has the same width over the entire height. Compared with the case where it is done, it is possible to suppress the inclination of the metal fitting itself by keeping the driving position of the first plate piece 111 constant to some extent. Further, when the fitting portion 11 is fitted to the flange 21, the found area of the beam member 2 of the first plate piece 111 in the weak axis direction (direction orthogonal to the web 22) is smaller than that of the conventional metal fitting. Therefore, even if a rotational moment force is applied to the fitting portion 111, it is possible to suppress the deformation and twisting of the metal fitting itself as compared with the conventional metal fitting and stabilize the built-up street of the inner wall base material 30. That is, since the strength of the metal fitting itself can be improved as compared with the conventional metal fitting by modifying the shape of the fitting portion 11, the plate thickness of the fitting portion 11 can be made thinner and economically. It can be an excellent metal fitting.

The inner wall base material 30 fixed to the base material fixing bracket 1 in this way is adjusted in and out of the inner wall 3 by rotating the adjusting bolt 13. That is, as shown in FIG. 10, the tool 4 is inserted into the locking hole 13a, the adjustment bolt 13 is rotated, and the rising piece 12b screwed into the adjustment bolt 13 and the inner wall substrate fitted into the support portion 12 are inserted. By sliding the material 30 along the bolt axis to a desired position, the out-of-plane direction can be adjusted.

Then, after the plurality of base material fixing fittings 1 fixed along the width direction of the inner wall base material 30 are respectively operated to adjust the inward and outward movement of the inner wall base material 30, as shown in FIG. The horizontal frame member 3a below the base material 30 is screwed to the floor base material F1 (not shown), and finally, the inner wall board material 31 is fixed to the plate surface of the inner wall base material 30 opposite to the flange 21 to fix the inner wall Complete 3.

As shown in FIG. 11, the base material fixing bracket 1 thus installed is, for example, a gusset plate 23 for joining the beam member 2 to the horizontal brace, the diaphragm protruding from the column member, and the orthogonal beam. Even if obstacles such as the bolt 24 and the nut 25 are installed on the flange 21 of the beam member 2, they can be arranged by utilizing a small gap and can be stably fixed to the flange 21. Further, even when the ceiling pocket is a narrow space where piping and wiring are complicated, the base material fixing fitting 1 of the present application can be effectively used, and the workability can be improved.

Further, the embodiment of the present invention is not limited to the above-mentioned embodiment, but can be appropriately modified within the scope of the idea of the present invention.

INDUSTRIAL APPLICABILITY The present invention can be suitably used when fixing an inner wall base material forming an inner wall to a beam material formed of H-section steel.

DESCRIPTION OF SYMBOLS 1 Base material fixing metal fitting 11 Fitting part 111 1st plate piece 112 2nd plate piece 112a (2nd plate piece) tip edge 11a Notch groove 11b End face 12 Support part 13 Adjustment bolt 13a Detachment prevention part 2 Beam material 21 Flange 22 Web 3 Inner wall 30 Inner wall base material 31 Inner wall board material α Angle W1 Width of tip end of cut W2 Width of base end of cut t Flange plate thickness F1 Floor base material

Claims (5)

A base material fixing bracket for fixing a plate-shaped inner wall base material installed on the back side of the inner wall board material forming the wall surface of the inner wall to the beam material formed of shaped steel having a flange and a web that are orthogonal to each other. There
A pair of second plate pieces that project in the same direction at substantially right angles to the first plate piece from both side ends of the first plate piece that are formed narrower toward the upper end are respectively provided with the second plate piece. A fitting portion formed by forming a notch groove that extends from the leading edge to the first plate piece side and fits into the flange;
A support portion that fits and supports the upper end portion of the inner wall base material in a direction orthogonal to the cut groove,
An adjustment bolt that connects the first plate piece and the support portion and adjusts the inward and outward movement of the inner wall base material fitted into the support portion,
The base material fixing metal fitting, wherein the notch is formed on the upper end side of the second plate piece. 2. The base according to claim 1, wherein the cut groove is formed by uniformly inclining a pair of end faces of the cut facing each other in a direction in which they approach each other from a base end of the cut toward a tip end thereof at the same angle. Material fixing bracket. The cut groove is formed such that a width of a tip end portion of the cut is narrower than a plate thickness of the flange, and a width of a base end portion of the cut is formed to be substantially the same as a plate thickness of the flange. The base material fixing metal fitting according to claim 1 or claim 2. The adjustment bolt has a tip end of the bolt directed toward the opening direction of the cut groove, and is a pull-out for preventing the support portion located on the tip side of the adjustment bolt from the first plate piece from falling off from the adjustment bolt. The base material fixing metal fitting according to any one of claims 1 to 3, wherein the stopper is formed at the tip of the bolt. A method of fixing an inner wall base material for fixing the inner wall base material to the beam member made of H-shaped steel by using the base material fixing metal fitting according to any one of claims 1 to 4.
The upper end of the plate-shaped inner wall base material is fitted and fixed to the support portion,
While placing the first plate piece to fit the cut groove into the flange,
After adjusting the inward and outward movement of the support portion and the inner wall base material fitted in the support portion by rotating the adjustment bolt,
A method of fixing an inner wall base material, wherein a lower end portion of the inner wall base material is fixed to a floor base material.

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