JP6813264B2 - Floor drainage hardware - Google Patents

Description

The present invention is fitted into the opening of a floor slab in a building used in kitchens, food factories, chemical factories, etc., and then cinder concrete is laid flush with the upper surface of the lid of the upper perforated plate to lay the floor. The present invention relates to floor drainage hardware having a built-in bowl-shaped trap connected to a drainage pipe suspended under the slab or a drainage pipe buried in the floor slab.

Generally, in kitchens, food factories, chemical factories, etc., in order to prevent the backflow of odor from the drainage pipe, drainage is temporarily retained in the middle of the drainage flow path, and the backflow of odor is blocked by the sealing water. Conventionally, floor drainage hardware has a built-in bowl-shaped trap that is fitted to the opening of the floor slab in the building and is connected to a drainage pipe suspended under the floor slab or a drainage pipe buried in the floor slab.

For example, as shown in FIG. 6 of Patent Document 1, as a floor drainage device on which a perforated plate, which is a drainage metal fitting that appears on the floor surface, is placed on the upper part, a bowl is placed above the trap pipe erected on the trap body. A floor drainage device with a built-in bowl-shaped trap that prevents backflow of odors by arranging it so that it covers it and burying it in the floor slab and connecting it to the floor slab buried pipe or the drainage pipe that is placed under the floor to drain water. Widely used. This floor drainage device is compactly equipped with a perforated plate with a net-like strainer that prevents coarse dust from entering the drainage pipe at the upper end and a built-in bowl-shaped trap. Especially, if the trap part comes off, clean and inspect it. Space around the trap pipe is not considered if possible.
In this Patent Document 1, it is a positioning fixture of the floor drainage fixture body that is fixed to the formwork when placing the floor slab with a nail, and is a female screw so that the lower drainage pipe can be screwed into the positioning fixture so that it does not need to be removed. The drainage pipe has the same diameter as the trap pipe, with the addition of a short pipe part that has been cut.

In addition, although it is installed on the floor, it swallows a larger amount of drainage than the floor drainage hardware, so it is a trap pipe that interferes with the cleaning of the tank part in the technology of the floor drainage basin that has a tank part that also has a function of collecting garbage. As a device in which the pipe diameter of the trap pipe is made smaller than the pipe diameter of the underfloor pipe for attachment / detachment, there are the following patent documents 2 and 3 for the drainage basin trap device and the like. In addition, there are trap devices of Patent Documents 4 and 5 and the like as a device for connecting a trap pipe to an existing underfloor drain pipe so as to be fitted, that is, connecting a trap pipe having a smaller diameter to the drain pipe. In addition, the position of the outside of the trap and the sphere in a variant of the trap that seals the sphere instead of a bowl on the end of the trap tube when the water level of the water seal drops, although it may be incomplete as a water seal. There is also an apparatus of Patent Document 6 in which the diameter of the trap tube is reduced due to the relationship.

Patent Document 2 discloses a trap device attached to a stainless steel drainage basin in which the trap pipe can be easily attached and detached and the trap pipe has a high sealing property when the trap pipe is attached thereto.
The trap device consists of a take-out pipe provided at the bottom of the drainage basin that joins the main body of the drainage basin and the drainage pipe below it, and a riser pipe erected on the take-out pipe at the bottom of the drainage basin (with the trap pipe described above). (Same as above) and a bowl-shaped cap. The take-out pipe of the drainage basin is provided with an inclined concave fitting portion formed of an inclined surface which is inclined so as to spread upward at the upper end thereof. On the other hand, the riser pipe is provided with an annular fitting portion formed of an inclined surface that is inclined so that the inclined surface is narrowed downward at the lower end thereof. An annular fitting portion of a rising pipe having a small pipe diameter is fitted to the inclined concave fitting portion of the engaging pipe.

In Patent Document 3, instead of providing a bowl-shaped cap, the tip is directed downward and an inverted U-shaped trap pipe is used as a whole, so that the trap pipe alone also has a trap function of forming a weir against water-sealed water. The drainage basin is disclosed.
The drainage basin is provided with a trap pipe connected to the drainage basin engaging pipe (formed at the drainage outlet that joins the lower drainage pipe that drains from the drainage basin) at an angle of 30-70 ° with respect to the vertical direction. ing. The tip end side of one end located above the trap tube is curved downward. The outer peripheral surface near the lower end, which is the other end of the trap tube, has a conical diameter reduction. On the other hand, in order to engage with the reduced diameter portion, the engaging tube has an upward inner peripheral surface that reduces the diameter in a conical shape. This trap pipe is made smaller than the drain pipe due to the processing convenience of the joint with the engaging pipe.

In addition, in Patent Document 4, in order to screw and connect a trap pipe erected at the bottom of a drainage basin with a trap, an engaging pipe having a substantially inner diameter of the outer diameter of the trap pipe and the drainage pipe is provided from the bottom of the drainage basin through a through hole. Both the drainage pipe and the trap pipe are screwed into the engaging pipe to make them detachable, and Patent Document 5 describes a stainless steel trap pipe erected at the bottom of a drainage basin with a trap via a height adjusting pipe. By connecting to the drain pipe, the height can be adjusted to fit.

Patent Document 6 discloses a trap that blocks odor even when the sealing water is broken.
The device has a spherical float arranged at the upper end of the trap pipe, and when the water level drops, the spherical float sits at the upper end of the trap pipe and closes the trap pipe. It may be incomplete as a water seal, but it is a variant of a trap that seals a sphere instead of a bowl by placing it on the end of the trap pipe when the water level of the water seal drops, and the positional relationship between the outside of the trap and the sphere. The diameter of the trap pipe is smaller than that of the drain pipe.

Japanese Unexamined Patent Publication No. 61-113935 Utility Model Registration No. 3104625 Japanese Unexamined Patent Publication No. 2004-346519 JP-A-2002-38556 Japanese Unexamined Patent Publication No. 2006-104824 JP-A-2007-225146

The wastewater is received by the equipment used in the production process of food factories, chemical factories, etc., but due to its frequency of use and low flow rate, it is not a drainage basin that has a garbage collection function, but a bowl type that is connected to a drainage pipe. In floor drainage hardware with a built-in trap, the drainage performance, for example, the allowable drainage amount, is usually not well defined. Regarding the flow rate of floor drainage hardware, the drainage amount for one washbasin is set as one drainage amount unit in the "method based on the equipment drainage load unit", which is a calculation method for determining the pipe diameter of the drainage pipe, and the drainage amount unit for floor drainage hardware is The fixture connection diameter is 3, 65A for 4, and 75A for 5. Since the maximum drainage pipe flow rate of the drainage pipe 75A at a gradient of 1/100 is 0.00189 m ³ / sec = 113 L / min and the allowable maximum drainage unit is 18, one drainage amount unit is 6.3 L / min in this calculation. However, one unit of drainage varies depending on the length ratio of the vertical pipe and the horizontal pull pipe of the wake drain pipe, and has a width of 6 to 28 L / min. The drainage pipe diameter of 75A is a value for a cast iron pipe that has not been used much in recent years, and indicates that it is different from the current state.
Due to such circumstances, the floor drainage hardware manufacturer does not guarantee the amount of drainage, and the drainage flow rate is uncertain. The main purpose is to prevent the backflow of odor from the drainage pipe, and the degree of flow path resistance of the sealed drainage channel during drainage has not been examined in detail. ..
In general, a round floor drainage hardware extending from a perforated plate, which is a drainage fitting having a diameter not much different from that of a drainage pipe, is inexpensive, but it is difficult to drain a large amount of drainage. On the other hand, the square drainage basin is expensive because it is almost a product, but it can drain a large amount of drainage.
However, if, for example, the amount of drainage required for the perforated concrete increases significantly due to a change in the equipment or layout of factory equipment, the drainage basin will be changed to a drainage basin with a large drainage capacity, but the floor slab will be opened. In order to remove the floor drainage hardware that was installed in the above, and to remove the box that fits the drainage basin, large-scale floor construction such as fishing with a diamond cutter on the concrete floor and placing cinder concrete is required.

It is thought that the drainage capacity through the perforated plate, which is a drainage fitting in floor drainage, is greatly affected by the diameter of the drainage pipe into which the drainage finally flows, and the floor drainage hardware, which is a temporary entrance, is used. It was thought that the bowl-shaped trap did not have much resistance to water flow. Therefore, the relationship between the cap and trap pipe of the floor drainage hardware body and the drainage capacity is hardly considered except that the dimensions are aligned based on the inner diameter.
However, in the production process of food factories, chemical factories, etc., strict control is performed in accordance with strict hygienic standards such as HACCP and GMP. For example, wastewater discharged from production equipment cannot be accepted by the drainage equipment on the equipment side. However, it is not permissible to overflow and drain water to other processes, resulting in hygienic damage to the product. However, due to the economic reason of demanding control of manufacturing costs including the initial running cost of the manufacturing environment, which rebounds from the product unit price of manufactured products, drainage facilities must also be formed at the minimum cost that meets the necessary and sufficient conditions.

Therefore, it is an object of the present invention to provide a floor drainage hardware having a simple structure and improving the wastewater treatment capacity, and further to provide a floor drainage hardware that improves the wastewater treatment capacity and realizes space saving.

(1) The floor drainage hardware of the present invention is fitted into the opening of the floor slab in the building, and then cinder concrete is laid flush with the upper surface of the lid of the upper perforated plate and hung under the floor slab. A floor drainage hardware having a built-in bowl-shaped trap connected to a drainage pipe or a drainage pipe buried in a floor slab, and a floor drainage hardware main body fitted to the opening of the floor slab and the floor drainage hardware main body. A trap pipe that is erected inside and communicates with the drain pipe through the drain port at the lower end, a bowl that covers the trap pipe, a control pipe that extends upward and contractably from the floor drainage hardware body, and the above. The trap consists of a metal frame located at the upper end of the control tube and a perforated plate consisting of a strainer to expand the flow path between the bowl and the outer peripheral surface of the trap pipe in order to reduce the flow path resistance of the drainage. The outer diameter of the pipe is smaller than the inner diameter of the drainage pipe.

(2) Here, the linear flow velocity of the drainage flowing upward between the trap pipe and the bowl is defined as the first average flow velocity V1, and the flow velocity of the drainage flowing downward between the floor drainage hardware body outside the bowl is the second average. Assuming the flow velocity V2, V1 / V2 is less than 85% when the nominal diameter of the drain pipe is 50A, V1 / V2 is less than 75% when the nominal diameter of the drain pipe is 65A, and V1 / when the nominal diameter of the drain pipe is 80A. It is preferable that V2 is less than 55%.
(3) Further, the linear flow velocity of the drainage flowing upward between the trap pipe and the bowl is defined as the first average flow velocity V1, and the flow velocity of the drainage flowing downward between the floor drainage hardware body outside the bowl is the second average flow velocity. Assuming V2, V1 / V2 is less than 83% when the nominal diameter of the drain pipe is 50A, V1 / V2 is less than 60% when the nominal diameter of the drain pipe is 65A, and V1 / V2 when the nominal diameter of the drain pipe is 80A. Is more preferably less than 50%.

(4) Then, the floor drainage hardware is formed of one steel pipe selected from the group consisting of steel pipes for piping whose drain pipes correspond to nominal diameters of 50A, 65A and 80A, and the trap pipe is a nominal pipe. It is preferably one steel pipe selected from the group consisting of the steel pipes corresponding to the diameters of 40A, 50A and 65A, and one formed of steel pipes having a nominal diameter one or two sizes smaller than the drainage pipe.
Here, "corresponding" is a concept that includes, in addition to the A designation, the B designation corresponding to the nominal diameter based on the outer diameter, and a steel pipe having an outer diameter specified by those designations.

(1) In the floor drainage hardware of the present invention, since the outer diameter of the trap pipe is smaller than the inner diameter of the drain pipe, the trap pipe and the bowl can be made by that amount without increasing the bowl manufactured in the ready-made size. A large gap can be taken between the two. Therefore, the flow path resistance flowing upward between the trap pipe and the dog can be reduced, and the wastewater treatment capacity can be improved.
And since the bowl is not enlarged, the space is saved in the radial direction by that amount.
In addition, since the outer diameter of the trap pipe is smaller than the inner diameter of the drain pipe in advance, the volume of the floor drainage hardware is increased, the diameter of the trap pipe and the bowl is increased, and the drainage capacity is measured. Since the amount of drainage is fixed, the drainage of the production equipment overflows after construction, and in order to correct it, in order to change to a drainage basin with a large drainage capacity, the installed floor drainage hardware is removed and a box suitable for the drainage basin There is no need for large-scale floor work such as hanging with a diamond cutter on the concrete floor or placing cinder concrete for drainage.

(2) In such floor drainage hardware, by expanding the flow path between the trap pipe and the bowl, the first average flow velocity V1 is made 80% or more smaller than the second average flow velocity V2, and the trap pipe and the bowl are By reducing the flow path resistance of the drainage flowing between them, it is possible to make the water overflow from the trap pipe without clogging by effectively utilizing the transporting force of the water head extruded against gravity.

(3) In such floor drainage hardware, the drainage pipe is formed of steel pipes for piping corresponding to nominal diameters 50A, 65A and 80A, and the trap pipe corresponds to the nominal diameters 40A, 50A and 65A. If it is one steel pipe selected from the group consisting of steel pipes and is made of steel pipes whose nominal diameter is one or two sizes smaller than the drainage pipes, the wastewater treatment performance can be determined by combining these standard products. Can be easily improved and space can be saved.

FIG. 1 is a partial cross-sectional view showing an embodiment of the floor drainage hardware of the present invention. FIG. 2 is a schematic exploded view showing an embodiment of a trap pipe and a dog. FIG. 3a is a sectional view schematically showing a floor drainage metal fitting of the present invention, and FIG. 3b is a sectional view taken along line aa of FIG. 3a. FIG. 4a is a cross-sectional view showing another embodiment of the floor drainage hardware, and FIG. 4b is a cross-sectional view showing a part of the conventional floor drainage hardware used in the water flow test as a comparative example.

<First Embodiment>
"1. Outline of floor drainage hardware"
The outline of the floor drainage hardware which is one Embodiment of this invention will be described with reference to FIG. The floor drainage hardware 1 communicates with a bottomed tubular floor drainage hardware main body 2 and a drainage port 2b provided at the bottom 2a of the floor drainage hardware main body as a main component, and stands up from the bottom 2a. It is composed of a trap pipe 3 having the same inner diameter as the drainage port 2b and a bowl 4 covering the trap pipe 3.

The floor drainage hardware main body 2 includes a bottom portion 2a and a cylindrical peripheral wall 2c that rises vertically from the peripheral edge thereof. When the diameter of the drainage pipe connected as the floor drainage fitting is 50A, the peripheral wall 2c is formed by welding with the bottom portion 2a using a stainless steel socket having a nominal diameter of 100A as a base material. On the lower surface of the bottom portion 2a, a stainless steel socket 2d having a nominal diameter of 50A communicating with the drainage port 2b is attached with the central axis coaxial with the drainage port 2b. In the present embodiment, the diameter of the drain port 2b is flush with the inner surface of the trap pipe 3. A female thread of a taper screw for a pipe is formed on the inner surface of the socket 2d. The socket 2d is screwed into and connected to the male thread of the pipe taper screw provided at the elbow-returned pipe end of the drainage pipe 5 (see two-dot chain line) buried in the floor slab or suspended below the floor slab. To.

An adjusting pipe 6 is screwed into the inner circumference of the upper end of the floor drainage hardware main body 2. The adjusting pipe 6 is used because a thick stainless steel pipe for piping having a nominal diameter of 100A and a schedule number of 20S protrudes upward into the slab for a long time. Then, a male screw of a parallel pipe screw is formed on the outer peripheral surface thereof. The adjusting pipe 6 is screwed into a female thread of a parallel screw for pipes formed on the inner peripheral surface of the floor drainage hardware main body 2, and the upper surface of the perforated plate 7 described later is set to the same height as the floor surface level after placing cinder concrete. It is adjusted before floor concrete construction to reach the level.
Hereinafter, in the present embodiment, the stainless steel pipe for piping used for the base material constituting the floor drainage hardware and the drainage pipe to be connected will be simply referred to as a 100A10S SUS pipe. 10S is a schedule number that defines the thickness of the pipe from the working pressure and material strength. Of course, carbon steel pipes and lining steel pipes as other examples can be handled in the same manner only by changing the name.
The stainless steel pipe in this embodiment is a stainless steel pipe for piping defined in JIS G 3459.

A cylindrical perforated plate 7 is fixed near the upper end of the adjusting pipe 6. A lid 7a is provided on the upper part of the perforated plate 7. The lid 7a has a ring-shaped base, and an O-ring 7b is arranged in a groove formed on the outer periphery thereof. The O-ring 7b elastically contacts the inner peripheral surface of the perforated plate main body 7c, and the lid 7a is locked to the inner surface of the perforated plate main body 7c.
Then, on the lower surface side of the ring-shaped base portion of the lid 7a, a dust-straining net 7d which is placed on the perforated plate main body 7c and has a mesh-like shape of 10 mesh and whose central portion extends downward in a convex shape is provided. The lid 7a may be a normal perforated strainer or a non-perforated lid. In the case of a non-perforated lid, the lid is removed when using drainage, so if the lid is transparent, observe the internal dust net 7d. It is still preferable because it can be done.

Next, the trap pipe 3 will be described with reference to FIG. Conventionally, the trap pipe 3 has a diameter of 50A10S, which is the same as that of the drainage pipe, but a SUS pipe of 40A10S, which is one size smaller, is used. In the present embodiment, the lower end of the SUS pipe is fixed to the bottom 2a of the floor drainage hardware body by welding. The inner surface of the trap pipe 3 and the inner edge of the drain port 2b are continuous.

The bowl 4 is processed by using a short pipe of 80A10S SUS pipe as a base material. The upper end of the 80A SUS pipe short pipe is closed by a top portion 4a which is a circular SUS flat plate. On the inner peripheral surface of the bowl 4, a raised piece 4b for mounting and engaging with the upper end portion of the trap pipe 3 below the lower surface of the top portion 4a is provided. The raised piece 4b is composed of a plurality of plate pieces arranged radially in at least three directions.
The raised piece 4b has a step portion 4c that engages with the upper end surface of the trap pipe 3 so as to be hooked, and an inner edge that fits with the side peripheral surface of the trap pipe 3. The raised piece 4b forms a gap between the trap pipe 3 and the top portion 4a of the bowl 4 from the upper end surface of the trap pipe 3 to the vicinity of the upper portion of the side peripheral surface continuous thereto.
The top portion 4a and the raised piece 4b are made of stainless steel.
Further, a picking piece 4d is provided on the upper surface of the top portion 4a of the bowl 4. The picking piece 4d is picked with a finger, and the bowl 4 is removed from the trap pipe 3.

In the present embodiment, the drainage port 2b, the trap pipe 3, the bowl 4, and the cylindrical peripheral wall 2c of the basin body are arranged concentrically. The concentric arrangement is provided by the raised piece 4b.

"2. Flow path resistance"
FIG. 3a shows a schematic view of the floor drainage hardware of the present invention. As shown in the figure, the linear flow velocity of the drainage flowing upward between the trap pipe 3 and the bowl 4 is defined as the first average flow velocity V1, and the flow velocity of the drainage flowing downward outside the bowl 4 is defined as the second average flow velocity V2. In the present invention, the first average flow velocity V1 is made smaller than the second average flow velocity V2 by expanding the flow path between the trap pipe 3 and the bowl 4, and the drainage flowing between the trap pipe 3 and the bowl 4 is discharged. By reducing the flow path resistance, the trap pipe 3 is flooded without clogging by effectively utilizing the transporting force of the water head extruded against gravity.

[Drainage pipe with a nominal diameter of 50A]
For example, in this embodiment, when the drainage pipe 5 connected to the floor drainage hardware has a size of 50A, the trap pipe 3 is 40A, the bowl 4 is 80A, and the peripheral wall 2c of the floor drainage hardware body 2 is 100A of 10S SUS pipe. Make it to the diameter. Here, the pipe having a nominal diameter of 40A has an outer diameter of 48.6 mm and a thickness of 2.8 mm, the pipe having a nominal diameter of 80A has an outer diameter of 89.1 mm and a thickness of 3.0 mm, and the pipe having a nominal diameter of 100A is outside. It has a diameter of 114.3 mm and a thickness of 3.0 mm.
The flow path area between the trap pipe 3 and the bowl 4 at this time is (((8.91-0.3 × 2) / 2) ² × π) − ((4.86 / 2) ² × π. ) = 35.67 cm ² , and the flow path area between the floor drainage hardware 2a and the bowl 4 is (((11.43-0.3 × 2) / 2) ² × π)-((8.91 / 2). ) ² x π) = 29.76 cm ² .
Therefore, assuming that wastewater flows from the upstream production equipment at 30 L / min, the first average flow velocity V1 is (30000/60) / 35.67 ÷ 100 = 0.140 m / s, and the second average flow velocity V2 is. (30000/60) /29.76/100 = 0.168 m / s. V1 / V2 is 83%, which is less than 85%.
Here, if the diameter of the trap pipe 3 is reduced, the flow path resistance inside the trap pipe 3 increases. However, the first average flow velocity V1 is 0.140 m / s at 30 L / min, and assuming that the trap pipe 3 of 40 A flows fully, the linear flow velocity is 0.27 m / s, and the vertical pipe horizontal pull pipe is used. If the water flow is 3 m / s, which can flow stably through the extended drainage pipe only by the gravity drop due to the gradient of the horizontal pulling pipe, it will be less than 1/11 of the area of the pipe, so it can stably flow into the trap pipe 3 as overflow. , Do not flow backwards. Therefore, the flow path resistance inside the trap pipe 3 does not matter.

In this combination, assuming that 40 L / min of wastewater flows from the upstream production equipment, the first average flow velocity V1 is (40000/60) / 35.67 ÷ 100 = 0.187 m / s, and the second average flow velocity V2. Is (40000/60) / 29.76 ÷ 100 = 0.224 m / s. As the amount of drainage changed from 30 to 40 L / min, the steady water level of the floor drainage hardware main body 2 rises and the head increases, so that the flow rate resistance due to the first average flow velocity V1 is balanced and settled.
At this time, since the first average flow velocity V1 is 0.187 m / s, assuming that the trap pipe 3 of 40 A is fully flown, the linear flow velocity is 0.33 m / s, and the vertical pipe horizontal pull pipe is extended. If the water flow is 3 m / s, which can flow stably through the drain pipe only by the gravity drop due to the gradient of the horizontal pull pipe, it will be about 1/9 of the area of the pipe, so the flow rate that can stably flow into the trap pipe 3 as overflow. Therefore, the internal flow path resistance does not matter.

In the case of conventional floor drainage hardware, the trap pipe 3 and the drain pipe are the same size, 50A has an outer diameter of 60.5 mm and a thickness of 2.8 mm, and the flow path area between the trap pipe 3 and the bowl 4 is (((8.91-0.3 × 2) / 2) ² × π)-((6.02 / 2) ² × π) = 25.47 cm2, the first average flow velocity V1 is (30000/60) / 25.47 ÷ 100 = 0.196 m / s, and V1 / V2 is 117%, which greatly exceeds 85%. Therefore, the transport force of the water head extruded against gravity is the first average flow velocity V1. It is weak because it is used for the flow path resistance due to the above, and 30 L / min is the limit of the processing flow rate to overflow the trap pipe 3 without clogging, and the flow rate is higher than this.

[Drainage pipe with a nominal diameter of 65A]
For example, in this embodiment, when the drainage pipe 5 connected to the floor drainage hardware has a size of 65A, the trap pipe 3 is 50A, the bowl 4 is 100A, and the peripheral wall 2c of the floor drainage hardware body 2 is 125A of the SUS pipe 10S. Make it to the diameter. Here, the pipe having a nominal diameter of 50A has an outer diameter of 60.5 mm and a thickness of 2.8 mm, the pipe having an outer diameter of 100A has an outer diameter of 114.3 mm and a thickness of 3.0 mm, and the pipe having an outer diameter of 125A has an outer diameter of 139.8 mm. It has a thickness of 3.4 mm.
The flow path area between the trap pipe 3 and the bowl 4 at this time is (((11.43-0.3 × 2) / 2) ² × π) − ((6.05 / 2) ² × π. ) = 63.34 cm ² , and the flow path area between the floor drainage hardware 2a and the dog 4 is (((13.98-0.34 × 2) / 2) ² × π)-((11.43 / 2). ) ² x π) = 36.3 cm ² .
Therefore, assuming that wastewater flows from the upstream production equipment at 40 L / min, the first average flow velocity V1 is (40000/60) /63.34 ÷ 100 = 0.105 m / s, and the second average flow velocity V2 is. (40000/60) /36.3 ÷ 100 = 0.184 m / s. V1 / V2 is 57%, less than 75% and even less than 60%.
Here, if the diameter of the trap pipe 3 is reduced, the flow path resistance inside the trap pipe 3 increases. However, the first average flow velocity V1 is 0.105 m / s at 40 L / min, and assuming that the trap pipe 3 of 50 A flows fully, the linear flow velocity is 0.281 m / s, and the vertical pipe horizontal pull pipe is used. If the water flow is 3 m / s, which can flow stably through the extended drainage pipe only by the gravity drop due to the gradient of the horizontal pulling pipe, it will be less than 1/10 of the area of the pipe, so it can stably flow into the trap pipe 3 as overflow. , Do not flow backwards. Therefore, the flow path resistance inside the trap pipe 3 does not matter.

In this combination, assuming that 80 L / min of wastewater flows from the upstream production equipment, the first average flow velocity V1 is (80000/60) / 63.34 ÷ 100 = 0.211 m / s, and the second average flow velocity V2. Is (80000/60) /36.3/100=0.367m / s. As the amount of drainage changed from 40 to 80 L / min, the steady water level of the floor drainage hardware main body 2a rises and the head increases, so that the flow rate resistance due to the first average flow velocity V1 is balanced and settled.
At this time, since the first average flow velocity V1 is 0.210 m / s, assuming that the trap pipe 3 of 50 A flows fully, the linear flow velocity becomes 0.562 m / s, and the vertical pipe horizontal pull pipe is extended. If the water flow is 3 m / s, which can flow stably through the drain pipe only by the gravity drop due to the gradient of the horizontal pull pipe, the area is about 1/5.3 of the pipe, so it can stably flow into the trap pipe 3 as overflow. Since the flow rate is just barely reached, the internal flow path resistance does not matter.

In the case of conventional floor drainage hardware, the trap pipe 3 and the drain pipe are the same size, 65A has an outer diameter of 76.3 mm and a thickness of 3.0 mm, and the flow path area between the trap pipe 3 and the bowl 4 is (((11.43-0.3 × 2) / 2) ² × π) − ((7.63 / 2) ² × π) = 46.37 cm ² , the first average flow velocity V1 is (40000/60) ) / 46.37 ÷ 100 = 0.144 m / s, and V1 / V2 is 86%, which exceeds 85%. Therefore, the transport force of the water head extruded against gravity is the first average flow velocity V1. It is weak because it is used for the flow path resistance due to the above, and 40 L / min is the limit of the processing flow rate to overflow the trap pipe 3 without clogging, and the flow rate is higher than this.

[Drainage pipe with a nominal diameter of 80A]
For example, in this embodiment, when the drainage pipe connected to the floor drainage hardware has a size of 80A, the trap pipe 3 is 65A, the bowl 4 is 125A, and the peripheral wall 2c of the floor drainage hardware body 2 is 150A.
Manufactured so that it has the diameter of 0S SUS piping. Here, the pipe having a nominal diameter of 65A has an outer diameter of 76.3 and a thickness of 3.0 mm, the pipe having an outer diameter of 125A has an outer diameter of 139.8 mm and a thickness of 3.4 mm, and the pipe having an outer diameter of 150A has an outer diameter of 165. It is 2 mm and has a thickness of 3.4 mm.
The flow path area between the trap pipe 3 and the dog 4 at this time is (((13.98-0.34 × 2) / 2) ² × π) − ((7.63 / 2) ² × π. ) = 93.2 cm ² , and the flow path area between the floor drainage hardware body 2a and the bowl 4 is (((16.52-0.34 × 2) / 2) ² × π)-((13.98 /). 2) ² × π) = 43.6 cm ² .
Therefore, assuming that wastewater flows from the upstream production equipment at 75 L / min, the first average flow velocity V1 is (75000/60) / 93.2 ÷ 100 = 0.134 m / s, and the second average flow velocity V2 is. (75000/60) /43.6 ÷ 100 = 0.287 m / s. V1 / V2 is 47%, less than 55% and even less than 50%.
Here, if the diameter of the trap pipe 3 is reduced, the flow path resistance inside the trap pipe 3 increases. However, the first average flow velocity V1 is 0.134 m / s at 75 L / min, and assuming that the trap pipe 3 of 65 A flows through the full pipe, the linear flow velocity is 0.273 m / s, and the vertical pipe horizontal pull pipe is used. If the water flow is 3 m / s, which can flow stably through the extended drainage pipe only by the gravity drop due to the gradient of the horizontal pulling pipe, it will be less than 1/10 of the area of the pipe, so it can stably flow into the trap pipe 3 as overflow. , Do not flow backwards. Therefore, the flow path resistance inside the trap pipe 3 does not matter.

In the case of this combination, assuming that 160 L / min of wastewater flows from the upstream production equipment, the first average flow velocity V1 is (16000/60) / 93.2 ÷ 100 = 0.286 m / s, and the second average flow velocity. V2 is (160000/60) /43.6/100=0.612m / s. As the amount of drainage changed from 75 to 160 L / min, the steady water level of the floor drainage hardware main body 2 rises and the head increases, so that the flow rate resistance due to the first average flow velocity V1 is balanced and settled.
At this time, since the first average flow velocity V1 is 0.286 m / s, assuming that the trap pipe 3 of 65 A flows fully, the linear flow velocity becomes 0.583 m / s, and the vertical pipe horizontal pull pipe is extended. If the water flow is 3 m / s, which can flow stably through the drain pipe only by the gravity drop due to the gradient of the horizontal pull pipe, it will be about 1/5 of the area of the pipe, so it will be stable as overflow and can flow into the trap pipe 3 as much as possible. Since it is a flow rate, the internal flow path resistance does not matter.

In the case of conventional floor drainage hardware, the trap pipe 3 and the drain pipe are the same size, 80A has an outer diameter of 89.1 mm and a thickness of 3.0 mm, and the flow path area between the trap pipe 3 and the bowl 4 is (((13.98-0.34 × 2) / 2) ² × π)-((8.91 / 2) ² × π) = 76.6 cm ² , the first average flow velocity V1 is (75000/60) ) / 76.6 ÷ 100 = 0.163 m / s, V1 / V2 is 57%, which is 55% or more, and the transport force of the water head extruded against gravity is the first average flow velocity V1. It is weak because it is used for the flow path resistance due to the above, and 75 L / min is the limit of the processing flow rate to overflow the trap pipe 3 without clogging, and the flow rate is higher than this.

Summarizing the above, 50A, 65A, which allows the floor drainage hardware to take up the gap between the trap pipe of the conventional floor drainage hardware and the bowl and the gap between the floor drainage hardware body outside the bowl, in terms of the drainage flow rate. The linear flow velocity of the drainage flowing upward between the trap pipe and the bowl is set to the first average flow velocity V1 so as to slow down the drainage line flow velocity between the trap pipe and the bowl according to each drainage pipe diameter of 80A. Assuming that the flow velocity of the drainage flowing downward between the floor drainage hardware body outside the bowl is the second average flow velocity V2, when the nominal diameter of the drainage pipe is 50A, V1 / V2 is less than 85%, and the drainage When the nominal diameter of the pipe is 65A, V1 / V2 may be less than 75%, and when the nominal diameter of the drainage pipe is 80A, V1 / V2 may be less than 55%.
Desirably, V1 / V2 is less than 83% when the nominal diameter of the drain pipe is 50 A, V1 / V2 is less than 60% when the nominal diameter of the drain pipe is 65 A, and V when the nominal diameter of the drain pipe is 80 A.
1 / V2 may be less than 50%.

FIG. 3b shows a cross section taken along line aa of FIG. 3a. As shown in the figure, the cross-sectional area of the gap between the trap pipe 3 and the bowl 4 is defined as the first cross-sectional area S1, and the cross-sectional area of the gap between the bowl 4 and the floor drainage hardware main body 2 is the second cross-sectional area S2. And. In the present invention, the outer diameter of the trap pipe 3 is made smaller than the diameter of the drain port 2b, and the first cross-sectional area S1 is increased. Therefore, the flow path resistance of the drainage flowing between the trap pipe 3 and the bowl 4 is reduced, and the space is saved even though the cross-sectional area is increased.

<Other embodiments>
[Procedure for construction]
FIG. 4a is a cross-sectional view showing the overall configuration of the floor drainage hardware. The floor drainage hardware 10 also shows the waterproof collar 13 required for installation on the floor slab of the floor drainage hardware 1 of FIG. 1 described above, and the lower end of the floor drainage hardware 2 is tapered roundly to make it smooth on the bottom 2a. It is shown as an actual commercialized floor drainage hardware 12 that is connected, the upper part of the peripheral wall 2c is divided into two pieces, the lower upper end is smoothly connected to the waterproof collar 13, and the upper side is screwed with the adjustment pipe 6. Is. The divided upper and lower parts of the divided peripheral wall 2c are welded to each other in the vicinity of the joint portion of the peripheral wall 2c of the waterproof collar 13 and are watertightly joined. The same parts as those in the embodiment of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
A waterproof collar 13 extends outward from the upper end of the lower portion of the divided peripheral wall 2c of the floor drainage hardware main body 12 of the floor drainage hardware 10 shown in FIG. 4a. The waterproof collar 13 receives the waterproof layer after placing the floor slab concrete here, repairs the waterproofing cut by the hole for the floor drainage hardware opened in the waterproof layer with this collar, and waterproofs the floor drainage hardware itself. Provided to form. Therefore, the waterproof collar 13 is slightly inclined downward toward the inside of the floor drainage hardware main body so as to guide the waterproof layer toward the inside of the floor drainage hardware main body 12.
First, the lower part of the floor drainage hardware main body 12 is fixed to a form (not shown) for placing the floor slab, and the floor slab is placed up to the upper side of the waterproof collar 13. Since the floor drainage hardware main body 12 is fixed, it is fixed at a predetermined position without moving against the pressure of the cast concrete.
After the placement of the floor slab concrete is completed and the floor slab concrete (Fig. 4a left-up hunting part) dries to generate a predetermined strength, a waterproof member such as asphalt proofing is placed on the upper part of the waterproof collar 13 and the floor slab concrete. (Waterproof layer: located at the boundary between the two hunting portions in FIG. 4a, but not shown) was laid, and then cinder concrete (Fig. 4a right) up to the level of the lid 7a of the perforated plate 7 whose level was adjusted by the adjusting pipe 6. The rising hunting section) is placed.

"3. Water flow test"
Next, an example of a water flow test for confirming the above-mentioned treated water amount will be described.
As the floor drainage hardware used for the water flow test, the floor drainage hardware of the embodiment and the drainage pipe connecting the same are drainage pipes of a factory in which a 30 m horizontal pull pipe is extended with a predetermined slope to imitate a predetermined vertical pipe. A simulated system was used. In this water flow test, floor drainage hardware was not placed on the floor.
An example is the floor drainage hardware of the embodiment of the present application shown in FIG. 4a.
A comparative example is a conventional floor drainage hardware (see FIG. 4b) in which a 50A trap pipe is used instead of the 40A trap pipe of the floor drainage hardware of Example 1.

The diameter of each component in each embodiment is summarized in Table 1 below.

<Modification example>
The shape of the box body 2 may be a rectangular shape such as a square as well as a cylindrical shape.
Further, in the above-described embodiment, the diameter of the drain port 2b is flush with the inner surface of the trap pipe 3, but it does not have to be flush.
Further, although the drainage port 2b is formed in the center of the bottom portion 2a of the box body 2, it may be formed at an eccentric position or on the peripheral wall 2c.
Further, the trap pipe 3 and the bowl 4 may have a cylindrical shape, a rectangular shape such as a square shape, or an irregular shape. And it may be somewhat curved. Furthermore, in the present embodiment, the box body 2, the trap pipe 3, and the bowl 4 are arranged concentrically, but they may be arranged eccentrically. In these cases, it is preferable to use the averaged first flow velocity V1 and second flow velocity V2 described above.
The schedule number of the steel pipe used in the present embodiment, the example, and the comparative example is 10S, but those of 5S, 20S, and 40S can also be used.
Further, in addition to the stainless steel pipe specified in JIS G 3459, a stainless steel pipe specified in JIS G 3468 or JIS G 3448 may be used.
Further, in addition to the stainless steel pipe, conventionally known steel pipes such as various carbon steel pipes for piping and lining steel pipes may be used. Then, as the carbon steel pipe, for example, a steel pipe such as a carbon steel pipe for piping (SGP), a carbon steel pipe for pressure piping (STPG), or a carbon steel pipe for high pressure piping (STS) may be used. Here, the above steel pipes including stainless steel pipes may be simply referred to as steel pipes.
Further, instead of using a steel pipe as the trap pipe 3 and the dog 4, the plate material may be bent to form a tubular material.

1 Floor drainage hardware 2 Floor drainage hardware body 2a Bottom 2b Drainage port 2c Peripheral wall 2d Socket 3 Trap pipe 4 Dog 4a Top 4b Raised piece 4c Step 4d Picking piece 5 Drainage pipe 6 Adjustment pipe 7 Eye plate 7a Lid 7b O-ring 7c Perforated plate body 7d Garbage strainer net 10 Floor drainage hardware 11 Garbage drainage hardware body 12 Floor drainage hardware body 13 Waterproof collar d Gap between trap pipe and bowl e Gap between trap pipe and bowl V1 First flow velocity V2 Second flow velocity S1 First cross-sectional area S2 2nd cross-sectional area

Claims (2)

After being fitted into the opening of the floor slab in the building, cinder concrete is cast and laid flush with the upper surface of the lid of the upper perforated plate, and the drainage pipe suspended under the floor slab or the drainage buried in the floor slab. A floor drainage hardware with a built-in bowl-shaped trap connected to a pipe.
The floor drainage hardware body that fits into the opening of the floor slab,
A trap pipe that is erected inside the main body of the floor drainage hardware and communicates with the drain pipe through the drain port at the lower end, and a bowl that covers the trap pipe.
An adjustment pipe that extends upward and contractably from the floor drainage hardware body,
It consists of a perforated plate body located at the upper end of the adjusting pipe and a perforated plate consisting of a lid.
The inner diameter of the bowl is larger than the outer diameter of the drain pipe,
The outer diameter of the trap pipe is made smaller than the inner diameter of the drain pipe in order to expand the flow path between the bowl and the outer peripheral surface of the trap pipe in order to reduce the flow path resistance of the drainage.
The drain pipe is formed of one steel pipe selected from the group consisting of steel pipes for piping corresponding to nominal diameters 50A, 65A and 80A, and the trap pipe is from the steel pipe corresponding to nominal diameters 40A, 50A and 65A. It is one steel pipe selected from the above group, and is formed from a steel pipe whose nominal diameter is one size smaller than that of the drain pipe.
The trap pipe and the flow speed first average flow velocity V1 of the drain upwardly flowing between said cup, second average flow rate of the flow velocity of the waste water flowing downwardly between the outer the floor drain hardware main body of the bowl V2 Then, when the nominal diameter of the drainage pipe is 50A, V1 / V2 is less than 85%, when the nominal diameter of the drainage pipe is 65A, V1 / V2 is less than 75%, and when the nominal diameter of the drainage pipe is 80A, V1. / V2 is Ru der less than 55%,
Floor drainage hardware featuring. When the nominal diameter of the drainage pipe is 50A, V1 / V2 is less than 83%, when the nominal diameter of the drainage pipe is 65A, V1 / V2 is less than 60%, and when the nominal diameter of the drainage pipe is 80A, V1 / V2 is The floor drainage hardware according to claim 1, which is less than 50%.

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