JP2003321858A - Drain formation pipe and drain formation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain formation pipe capable of preventing a hollow in which waste water accumulates from forming. <P>SOLUTION: The drain formation pipe 23 is provided with a pipe body 31 and a buffering body 32 fitted to the pipe body 31. The pipe body 31 has a pipe main body 43 forming an opening 41 and rising plates 47 rising up toward the upper side from the both side upper edges exposed to the opening 41 of the pipe body 43. The pipe body 31 has a protruded plate 52 projecting from the upper end of the rising plate 47 to the outside and an extension plate 53 extended downward from the outer end of the protruded plate 52 by folding it. The buffering body 32 is formed in a slender shape making a nearly J-shaped section fittable to the extension plate 53. The upper face of the buffering body 32 is positioned between the floor face and the upper face of the protruded plate 52. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain groove forming pipe and a drain groove forming method capable of suppressing the occurrence of a defect in which a concave groove is formed on the outer surface side of an extension plate portion of a pipe body.

[0002]

2. Description of the Related Art In recent years, for example, a drainage ditch on the floor of a kitchen or a food factory is replaced with a concrete drainage ditch by a pipe-shaped metal drainage ditch forming pipe from the viewpoint of ensuring a sanitary environment. It is often formed.

Since a lid such as a grating is not used, it is not necessary to form a lid mounting step portion. Therefore, the structure is simplified and the manufacturing is simple, and the inner surface is a smooth surface. It is hard for food waste to get caught on the
For example, the drain groove forming pipe shown in FIG. 10 is widely used as a device that can be easily cleaned and can reduce the labor force of an operator.

The conventional drainage channel forming pipe shown in FIG. 10 is mainly made of, for example, stainless steel, which is less corrosive, and has an opening 1 formed in the axial direction of the pipe at its upper portion and having a substantially curved bottom inner surface. The pipe main body 3 that is the smooth surface 2 and the upper edges of both sides of the pipe main body 3 that face the opening 1 rise upward in a substantially vertical manner from one upper end to the other end in the longitudinal direction. A pair of right and left rising plate portions 5 each having a smooth surface 4 and formed in a shape that gradually changes toward the sides.
And the left and right sides of the pair of left and right rising plate portions 5 which are outwardly bent to project outward in a substantially horizontal direction and whose upper surface is a floor surface forming smooth surface 6 which is substantially flush with the floor surface 10. It is composed of a tube body 9 having a pair of protruding plate portions 7 and a pair of left and right extension plate portions 8 extending downward from the outer ends of the pair of left and right protruding plate portions 7 by bending downward. There is.

The drainage groove thus formed is buried with the floor surface forming smooth surface 6 substantially flush with the floor surface 10.

[0006]

However, as shown in FIG.
Since the conventional drainage groove forming pipe shown in (1) is made of, for example, a metal, the drainage groove inner surface as well as the outer surface is a smooth surface, has low jointability with other objects, and is easily peeled off.

From this, as shown in FIG. 11, in particular, the floor portion which was in contact with the outer surface of the downward extending plate portion 8 of the tubular body 9 is likely to be peeled off and damaged by impact, vibration, etc.
There is a risk that the recessed groove 11 in which drainage is accumulated is formed on the outer surface side of the extension plate portion 8.

The present invention has been made in view of the above circumstances, and a drainage groove forming pipe and a drainage groove forming method capable of suppressing the occurrence of a defect in which a concave groove is formed on the outer surface side of the extension plate portion of the pipe body. The purpose is to provide.

[0009]

A drainage groove forming pipe according to a first aspect of the present invention comprises a pipe body and a buffer body fitted to the pipe body, and the pipe body has an upper portion in a pipe axial direction. A pipe main body having an opening formed therein and a bottom inner surface of which is a substantially curved smooth surface, and a substantially vertical rise from the upper edges on both sides of the pipe main body facing the opening, and the rising dimension thereof. Are formed in a shape that gradually changes from one end side in the longitudinal direction to the other end side in the longitudinal direction, and the pair of left and right rising plate portions whose inner surfaces are smooth surfaces and the upper ends of the pair of left and right rising plate portions are formed. And a pair of left and right projecting plate portions that protrude outward in a substantially horizontal direction by bending from the outer side, and the upper surface is a floor surface forming smooth surface that is substantially flush with the floor surface. It has a pair of left and right extension plates that extend downward from the outer edge of the The cushioning body is formed in an elongated shape having a substantially J-shaped cross section that can be fitted into the extension plate portion, and the upper surface is located substantially on the same plane as the floor surface and the floor surface and the floor surface are formed. It is a contact surface that connects with the smooth surface.

Further, it is formed in an elongated shape having a substantially J-shaped cross section so that it can be fitted into the extension plate portion of the tubular body, and the upper surface is located substantially on the same plane as the floor surface and the floor surface and the floor surface forming slide surface are formed. Since the cushioning body is provided as a connecting smooth surface for communicating with the surface, it is possible to suppress the occurrence of a defect in which the concave groove is formed on the outer surface side of the extension plate portion of the tubular body.

According to a second aspect of the present invention, there is provided the drainage channel forming pipe according to the first aspect, wherein the buffer body has a substantially arcuate arc surface corresponding to an outer surface of an upper end portion of the extension plate portion. Is.

Further, since the buffer body has a substantially arcuate arc surface corresponding to the outer surface of the upper end portion of the extension plate portion, it is effective to cause the problem that a concave groove is formed on the outer surface side of the extension plate portion of the tubular body. Suppressed to.

According to a third aspect of the present invention, there is provided a drainage groove forming method, which comprises a tubular body and a cushioning body fitted to the tubular body, wherein the tubular body has an opening formed in a pipe axial direction at an upper portion thereof and an inner surface of a bottom portion thereof. Is a substantially curved smooth surface, and rises substantially vertically from the upper edges on both sides of the pipe body facing the opening, and the rising dimension is long from one end side in the longitudinal direction. A pair of left and right rising plate portions formed in a shape that gradually changes toward the other end in the direction, and the inner surface of which is a smooth surface,
A pair of left and right projecting plates that protrude outwardly from the upper ends of the pair of left and right rising plates outwardly in a substantially horizontal shape, and the upper surface is a floor-forming smooth surface that is substantially flush with the floor surface. And a pair of left and right extension plate portions that extend downward from the outer ends of the pair of left and right protruding plate portions by bending downward, and the cushioning body is fitted to the extension plate portion. It is formed in a slender shape having a substantially J-shaped cross section, and its upper surface is located on substantially the same plane as the floor surface and serves as a connecting smooth surface that connects this floor surface and the floor surface forming smooth surface. A drainage groove forming method for forming a drainage groove on a floor using a drainage groove forming pipe, wherein the buffer body is attached to the extension plate portion of the pipe body by fitting the buffer body to the pipe body. A step of fitting, and a step of positioning the tubular body fitted with the buffer body at a predetermined position,
After this positioning, the floor surface is formed, and the floor surface, the connecting smooth surface, and the floor surface forming smooth surface are respectively positioned on substantially the same plane.

Then, a step of fitting the buffer body to the tubular body by fitting the buffer body to the extension plate portion of the tubular body, and a step of positioning the tubular body fitted with the buffer body at a predetermined position. And the step of forming a floor surface after this positioning, and arranging the floor surface, the connecting smooth surface, and the floor surface forming smooth surface on substantially the same plane, a drainage groove is easily formed on the floor. It becomes possible.

[0015]

DETAILED DESCRIPTION OF THE INVENTION The configuration of an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 4, reference numeral 21 denotes a kitchen room floor, for example.
The floor 21 is provided with a floor body 22, and a drain groove forming pipe 23 is embedded in a substantially central portion of the floor body 22.
A drainage groove 24 is formed by 23.

Then, the surface (upper surface) of the floor body 22 is gradually inclined downward toward the drainage groove forming pipe 23 so that the drainage containing the food waste flows into the drainage groove forming pipe 23. The floor surface 25 has a gentle slope.

Here, as shown in FIGS. 1 to 3, the drainage groove forming pipe 23 is made of metal and is fitted to both sides of the pipe 31 along the pipe 31. A pair of elongated left and right synthetic resin buffer bodies 32 are provided.

The tubular body 31 is integrally formed of a metal such as stainless steel in the shape of an elongated pipe having a substantially Ω-shaped cross section, is arranged in a slant of a predetermined gradient, and has an upper end portion in the axial direction of the pipe. The opening 41, that is, the opening 41, which is a slit-like groove elongated in the tube axial direction, is formed, and the tube main body 43 has a substantially C-shaped cross section in which the inner surface of the bottom portion is a substantially curved smooth surface 42.

Further, the pipe body 31 has an opening 41 in the pipe body 43.
From the upper edges on both sides toward the upper side in a substantially vertical manner, and the rising dimension gradually increases from the upstream end side, which is one end in the longitudinal direction, to the downstream end side, which is the other end in the longitudinal direction. It has a pair of elongate right and left rising plate parts 47 in the shape of a wedge, and the inner surfaces facing each other are substantially vertical smooth surfaces 46. There is a difference between the vertical length at the upstream end and the vertical length at the downstream end of each rising plate portion 47.

The space between the smooth surfaces 46 of the rising plate portion 47 having the upper side horizontal and the lower side inclined is located on the upper surface of the floor drainage inlet 48.
There is a narrow drainage introduction space 48 that is always open upward with a.

The width of the drainage introduction space 48 is set to the pipe body portion.
The diameter of 43 is made extremely narrow compared to 48 so that it does not hinder the walking of workers even without a lid such as grating, and the lid and lid mounting step become a culture medium for bacteria. This is because the division is positively omitted.

Further, the pipe body 31 is bent outward from the upper ends of the pair of left and right rising plate portions 47 so as to integrally project in a substantially horizontal shape, and its upper surface is located substantially flush with the floor surface 25. It has a pair of left and right projecting plate portions 52 in the shape of an elongated rectangle which are substantially horizontal floor surface forming smooth surfaces 51.

The tubular body 31 is composed of a pair of left and right projecting plate portions.
It has extension plate portions 53 such as a pair of left and right embedding pieces in the shape of elongated rectangles that are integrally extended in a substantially vertical shape by bending downward from the outer end of 52. Strictly speaking, the bent portion which is the upper end portion of the extension plate portion 53, as is apparent from FIG. 2, the outer surface of the upper end portion is not bent at a right angle, but becomes a substantially arc-shaped arc surface 54. There is.

The downward extension plate portion 53 is projected from the outer end of the projection plate portion 52 by embedding the extension plate portion 53 below the floor surface 25 so that the substantially horizontal projection plate portion 52 is impacted. This is to prevent it from curling up due to vibration or the like.

Further, the entire outer surface of the pipe main body 43, the entire outer surface of each rising plate portion 47, the entire lower surface of each protruding plate portion 52, and the upper inner surface of each extension plate portion 53 are respectively referred to as the floor 22. Touching.

Further, the rising plate part 47 and the projecting plate part 52 constitute a drainage introducing part 59.

On the other hand, as shown in FIG. 1, a plurality of fixing plates 36 having bolt insertion holes 35 are fixedly attached to the outer surface of the tube 31.

As shown in FIG. 2, each buffer body 32 is made of synthetic resin such as vinyl chloride, and is made of synthetic resin such as vinyl chloride.
It is integrally formed in the shape of an elongated strip having a substantially J-shaped cross section that can be fitted into.

The upper surface of the cushioning body 32 is located substantially on the same plane as the floor surface 25 at a position between the gently sloping floor surface 25 and the substantially horizontal floor surface forming smooth surface 51. A substantially horizontal connecting smooth surface 61 that connects the floor surface 25 and the floor surface forming smooth surface 51 is formed, and the floor surface 25, the connecting smooth surface 61, and the floor surface forming smooth surface 51 are substantially on the same plane. Is located at a point to form one continuous surface.

Further, the extension plate portion 53 at the upper end portion of the buffer body 32
One side surface on the side is a substantially arc-shaped arc surface 62 corresponding to the arc surface 54 on the outer surface of the upper end portion of the extension plate portion 53.
The circular arc surface 62 and the circular arc surface 54 of the extension plate portion 53 are in planar contact with each other. On the other hand, the entire other side surface of the buffer body 32 is a vertical surface 63, and the vertical surface 63 is in contact with the floor body 22.

Further, the cushioning body 32 has a concave portion 65 which holds the lower portion of the extension plate portion 53 from both inside and outside, and the lower portion of the extension plate portion 53 is fitted into the concave portion 65.

The portion of the concave portion 65 that contacts the inner surface of the lower portion of the extension plate portion 53 is arranged so that the lower portion of the extension plate portion 53 fitted in the concave portion 65 does not come out, that is, the extension plate portion 53 of the tubular body 31. So that the fitting state of the buffer body 32 to the
The retaining portion 66 has an uneven shape.

On the other hand, as shown in FIG. 3, a drain 71 is connected to a downstream end of the drainage groove forming pipe 23, and an upstream end of a drainage pipe 72 is connected to the drain 71.

This basin 71 is composed of an upper water collecting basin 74 to which the downstream end of the drainage channel forming pipe 23 is connected and a lower drainage basin 75 to which the upstream end of the drainage pipe 72 is connected. ing.

A lid mounting step 77 is provided on the upper end of the water collecting basin 74.
Are formed, and the grid-like lid 78 is placed on the lid-placing step 77. A removable strainer 79 is attached to the lower end of the water collecting basin 74, and the strainer 79 is located in the drainage basin 75.

Next, the drainage groove forming pipe of the above-described embodiment
A case where the drainage groove 24 is formed on the floor 21 of the kitchen room by using 23 will be described with reference to the drawings.

First, as shown in FIG. 5, a floor foundation portion 82 having a groove 81 for installation having a rectangular cross section is formed by pouring concrete or the like.

Next, in the installation groove 81, the floor foundation
The mounting angle 83 is fixed to the 82 with the anchor bolt 84.

On the other hand, by fitting the lower portions of the extension plate portions 53 of the pipe body 31 into the concave portions 65 of the cushion body 32 so as to fit the cushion bodies 32 into the extension plate portions 53 of the pipe body 31, respectively. A buffer body 32 is fitted on the tube body 31 to integrate the tube body 31 and the buffer body 32.

Then, the tube body 31 in which the pair of left and right shock absorbers 32 are fitted is fixed to the mounting bolt with an anchor bolt 84.
Position and fix in place of 83.

That is, the predetermined position of the long hole 85 of the mounting angle 83 and the bolt insertion hole 35 of the fixed plate 36 are aligned with each other, and the bolt 87 is inserted through both the aligned holes 35 and 85. Screw the nut 88 against. Bolt 87
By moving along the pipe 85, the height positions of the integrated pipe body 31 and the buffer body 32 can be easily adjusted.

A mounting angle 83 is attached to the floor foundation 82.
If the anchor bolts 84 are not fixed, the reinforcing bars (not shown) of the floor foundation 82 and the mounting angles 83 are welded and fixed.

Then, as shown in FIG. 6, concrete is poured so as to fill the installation groove 81 of the floor foundation portion 82 to form the groove filling portion 90. At this time, as is clear from FIG.
The upper end side of the pipe body 31 and the buffer body 32 project from the upper surface of the groove filling portion 90.

Next, as shown in FIG. 7, concrete is cast on the groove filling portion 90 and the floor foundation portion 82 to form a concrete floor surface portion 91.

At this time, the surface of the floor 91 is provided with a drain groove forming pipe.
A floor surface 25 that is a finishing surface is formed by forming a gently sloping surface that gradually inclines downward toward 23.
The connecting smooth surface 61 of each buffer 32, the floor-forming smooth surface 51 of the tubular body 31, and the floor drainage inlet 48a are located on substantially the same plane.

That is, the connecting smooth surface 61 of the buffer 32 is interposed between the floor surface 25 of the floor body 22 and the floor surface forming smooth surface 51 of the pipe body 31,
The floor surface 25, the connecting smooth surface 61, and the floor surface forming smooth surface 51 are continuous.
The floor body 22 is constituted by the floor foundation portion 82, the groove filling portion 90, the floor surface portion 91, and the like.

Through these steps, a drain groove forming pipe is formed on the floor 22 of the kitchen floor 21 as compared with a method of resin coking between the floor 22 and the tube 31. The drainage groove 24 can be formed very easily at 23.

Next, the drainage forming pipe of the above-described embodiment
The operation and the like of 23 will be described.

For example, when cleaning the floor 21 of the kitchen room, the floor surface 25
When the food waste adhering to is washed away with water, the water turns into drainage mixed with food waste and flows sequentially on the floor surface 25, the contact smooth surface 61 and the floor surface forming smooth surface 51, and the drain groove 24 Is introduced into the drainage introducing space 48 from the floor drainage introducing port 48a, and enters into the inclined pipe main body portion 43 having a predetermined slope corresponding to the shape of the rising plate portion 47.

Since the floor drainage inlet 48a of the drainage groove 24 is not closed with a lid, drainage mixed with food waste directly flows into the drainage inlet space 48 from the floor drainage inlet 48a, and the pipe body 43
Pour into.

The drainage flowing into the pipe body 43 flows toward the basin 71 due to the inclination of the pipe body 43 and is collected. Water collected in basin 71 The drainage collected in basin 74 is a strainer.
After the food waste is separated and removed by 79, it flows through the drainage basin 75 and the drainage pipe 72.

The drain groove forming pipe 23 is formed by the pipe body 31.
Is formed in an elongated shape having a substantially J-shaped cross section that can be fitted to the downward extension plate portion 53, the upper surface of which is substantially flush with the floor surface 25, and the floor surface 25 and the floor surface forming smooth surface 51. Contact smooth surface 61
It is a configuration in which the buffer body 32 that is
A buffer 32 is interposed between the floor 22 and the pipe 31.

Therefore, for example, even if the outward projecting plate portion 52 of the pipe body 31 and the portion of the floor surface portion 91 in the vicinity of the drainage groove 24 are subjected to shock, vibration, etc. from a walking worker, a moving carriage, or the like,
The shock, vibration and the like are absorbed by the buffer body 32.

In addition, the floor surface portion 91 is more familiar and easier to peel off when it is joined to the synthetic resin buffer body 32 than when it is directly joined to the metal tube body 31.

Therefore, unlike the conventional case, the problem that the concave groove 11 is formed on the outer surface side of the extension plate portion 53 of the tube body 31 does not occur, and a good sanitary environment in the kitchen can be appropriately secured. .

That is, on the outer surface side of the extension plate portion 53 of the pipe body 31, even if a shock, vibration or the like is applied to a portion of the floor body 22 near the drain groove 24 from a walking worker or a moving carriage. The concrete end portion of the floor body 22 in the vicinity of the drainage groove 24 is not separated from the buffer body 32 and maintains a joint state with the buffer body 32, so that drainage, dust, etc. are stagnant due to cracks, chips, etc. It is possible to properly secure a good sanitary environment in the kitchen without forming the recessed groove 11 that is formed.

The floor surface portion 91 of the floor body 22 of the floor 21 of the kitchen room
As shown in FIG. 8, it may not be formed of cast concrete, but may be formed of a plurality of synthetic resin floor sheets 93, for example.

In this case, after the steps shown in FIG. 6 have been performed through the above-described predetermined steps, the thickness of the floor sheet 93 is determined from the height of the floor surface 25 which is substantially flush with the floor surface forming smooth surface 51. After the concrete is placed in a state of being lower by the amount, the floor sheets 93 are arranged side by side on the concrete, and the floor surface portion 91 made of synthetic resin is formed to form the floor surface 25 to be a finished surface.

Thereafter, as shown in FIG.
The upper corner portion on the side opposite to the extension plate portion 53 side and the upper corner portion of the floor sheet facing the upper corner portion are cut out in a substantially U shape to form a welding groove 94.

Next, the buffer 32 and the floor sheet 93 are welded and fixed by the welding rod 95 so that the welding groove 94 is filled with the welding rod 95.

Although not shown in the drawings, the gentle sloped floor surface 25, the substantially horizontal connecting smooth surface 61 and the substantially horizontal floor surface forming smooth surface 51 which are continuously arranged on the same plane are not shown. The connecting smooth surface 61 and the floor surface-forming smooth surface 51 may each have a gentle slope in conformity with the floor surface 25.

[0063]

According to the invention as set forth in claim 1, it is formed in an elongated shape having a substantially J-shaped cross section that can be fitted into the extension plate portion of the tubular body, and the upper surface is located substantially on the same plane as the floor surface. Since the cushioning body is provided as a connecting smooth surface that connects the floor surface and the floor surface forming smooth surface, it is possible to suppress the occurrence of a defect in which a concave groove is formed on the outer surface side of the extension plate portion of the tubular body. .

According to the second aspect of the present invention, since the buffer body has a substantially arcuate arc surface corresponding to the outer surface of the upper end portion of the extension plate portion, the groove is formed on the outer surface side of the extension plate portion of the tubular body. It is possible to effectively suppress the occurrence of such troubles.

According to the third aspect of the present invention, the step of fitting the buffer body to the pipe body by fitting the buffer body to the extension plate portion of the pipe body, and the pipe fitted with the buffer body By positioning the body at a predetermined position and forming a floor surface after this positioning, and arranging the floor surface, the connecting smooth surface and the floor surface forming smooth surface on substantially the same plane, The drainage groove can be easily formed in.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a drain groove forming pipe of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a drain groove forming pipe of the same.

FIG. 3 is a side sectional view of the drain groove forming pipe of the same.

FIG. 4 is a plan view of the floor of the kitchen room in which the drain groove forming pipe is embedded.

FIG. 5 is an explanatory view for explaining a procedure for forming a drainage groove on the floor of the kitchen room.

FIG. 6 is an explanatory diagram following FIG. 5;

FIG. 7 is an explanatory diagram following FIG. 6;

FIG. 8 is a diagram when a floor sheet is used.

FIG. 9 is a cross-sectional view showing a welded portion of a floor sheet and a cushioning body.

FIG. 10 is a cross-sectional view of a conventional drain groove forming pipe.

FIG. 11 is a cross-sectional view of a conventional drainage groove forming pipe.

[Explanation of symbols] 21 floors 23 Drain forming pipe 24 drains 25 floor 31 tube 32 buffer 41 opening 42 smooth surface 43 Tube body 46 smooth surface 47 rising board 51 Floor forming smooth surface 52 Projection plate 53 Extension plate 61 contact surface 62 arc surface

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takaaki Kinoshita             2-12-14 Nagatacho, Chiyoda-ku, Tokyo Stock             Ceremony Company ABC Trading Company F term (reference) 2D061 AA10 AB10 AC03 AC05 AD03                       AD10                 2D063 CA09 CA11

Claims (3)

[Claims] 1. A tube body and a cushioning body fitted to the tube body, wherein the tube body has an opening in the tube axis direction formed in an upper portion thereof, and an inner surface of the bottom portion is a substantially curved smooth surface. Of the pipe main body and the upper edges of both sides of the pipe main body facing the opening upward in a substantially vertical manner, and the rising dimension gradually increases from one side in the longitudinal direction to the other side in the longitudinal direction. A pair of left and right rising plate parts that are formed in a changing shape and have an inner surface that is a smooth surface, and a pair of left and right rising plate parts that protrude outward from the upper ends in a substantially horizontal shape by bending outward, Is a pair of left and right projecting plate portions which are floor surface forming smooth surfaces located substantially on the same plane as the floor surface, and is bent downward from the outer ends of the pair of left and right projecting plate portions to form a substantially vertical shape. And a pair of left and right extension plates that extend, wherein the cushioning member is a disconnection member that can be fitted to the extension plate. It is formed in an elongated shape having a substantially J shape, and its upper surface is located on substantially the same plane as the floor surface and serves as a connecting smooth surface that connects this floor surface and the floor surface forming smooth surface. A characteristic drainage pipe. 2. The drain groove forming pipe according to claim 1, wherein the buffer body has a substantially arcuate arc surface corresponding to the outer surface of the upper end portion of the extension plate portion. 3. A pipe body and a buffer body fitted to the pipe body, wherein the pipe body has an opening in the pipe axis direction formed in an upper portion thereof, and an inner surface of the bottom portion is a substantially curved smooth surface. Of the pipe main body and the upper edges of both sides of the pipe main body facing the opening upward in a substantially vertical manner, and the rising dimension gradually increases from one side in the longitudinal direction to the other side in the longitudinal direction. A pair of left and right rising plate parts that are formed in a changing shape and have an inner surface that is a smooth surface, and a pair of left and right rising plate parts that protrude outward from the upper ends in a substantially horizontal shape by bending outward, Is a pair of left and right projecting plate portions which are floor surface forming smooth surfaces located substantially on the same plane as the floor surface, and is bent downward from the outer ends of the pair of left and right projecting plate portions to form a substantially vertical shape. And a pair of left and right extension plates that extend, wherein the cushioning member is a disconnection member that can be fitted to the extension plate. A drainage groove that is formed in an elongated shape that forms a substantially J-shape, and has an upper surface that is substantially flush with the floor surface and that serves as a connecting smooth surface that connects the floor surface and the floor surface forming smooth surface. A method of forming a drainage groove in a floor using a forming pipe, comprising fitting the buffer body to the pipe body by fitting the buffer body to the extension plate portion of the pipe body. And a step of positioning the tubular body in which the cushioning body is fitted at a predetermined position, the floor surface is formed after this positioning, and the floor surface, the connecting smooth surface, and the floor surface forming smooth surface are formed. And a step of arranging the drain grooves on substantially the same plane.