KR100588297B1 - Apparatus of prevention flowing backward using drainpipe - Google Patents

Abstract

The present invention is operated by the lifting and lowering according to the amount of sewage flowing in, the amount of drainage is appropriately adjusted according to the amount of incoming sewage to prevent backflow of the sewer pipe to prevent backflow due to a large amount of sewage More specifically, the apparatus is fixed to face four inner walls of the collecting manhole 200, and in the center is formed a slide hole (111a) open forward and vertically through the front, both sides of the slide hole (111a) The side wing 111b is provided with a fastening hole 111b "for fixing with a fastening bolt 111b 'to a detachable groove 204 formed on an inner wall of the collecting manhole 200, and a slide hole 111a. The upper wing 111c and the lower wing 111d having the bolt hole 111c 'and extending at the upper and lower ends of the slide hole 111a are constituted by the elevating frame 111 formed on both sides of the slide hole 111a. On the other hand, the slab is fixed to the upper wing (111c) of the elevating frame 111 The plate-shaped frame cover 112 for closing the guide hole 111a is fixed to the bolt 112a, and bolt holes 112a 'through which the bolt 112a is inserted are provided at both sides of the frame cover 112. A fastening ring 112c to which one end of the tension spring 112b is connected is formed at the lower center thereof, while a locking protrusion 112'a is formed at the lower wing 111d to insert the lower end of the elastic spring 112d. The cover 112 'is bolted to the inner bottom of the four-piece frame portion 11 and the collection manhole 200 in which the frame portion 11 is installed, the overall shape of the' × 'and the center is grating ( Inserted into the fixing hole 301 of the 300 and the protruding long bolt 400 is fastened and communicated from the top to the bottom so as to be fixed by the nut 500, the insertion hole 122 having a female screw 122a is formed on the inner peripheral surface It is provided, the end is arranged to face the frame portion 11, the inside is hollow, the top is closed and the bottom is open A rectangular box shape is formed, but the both sides of the fixed drainage body 12 is provided with a plurality of drainage holes 121, the lifting and lowering induction frame 111 of the frame portion 11 in the state fitted to the fixed drainage body 12 While being connected to the elevating and draining the sewage, while the 'x' shaped lifting hole 131 is formed in the center so as to slide into the 'x'-shaped fixed drainage body 12, the lifting hole ( 131 is inserted into the slide hole (111a) of the elevating induction frame 111, the tension spring 112b connected to the frame cover 112 fixed to the upper wing (111c) of the elevating induction frame (111) Fastening ring (132a) is connected to the other end of the) is fixed to the upper, of the elastic spring (112d) of the lower fixed to the locking projection (112'a) of the frame cover 112 'fixed to the lower wing (111d) A lifting projection 132 having a fixing protrusion 132b having an upper portion fitted therein is provided, while removing the lifting hole 131. A bottom plate 133a is formed at the outer bottom to form a water collecting portion 133, and a drainage hole 133b communicating with the lifting hole 131 is formed to drain the sewage collected in the water collecting portion 133. It is characterized by consisting of the lifting and lowering drainage (13).

Sewer pipe, backflow prevention, lifting guide frame, fixed drainage, lifting drainage

Description

Apparatus of prevention flowing backward using drainpipe}

1 is a cross-sectional view showing a collecting manhole for preventing backflow of a conventional sewage pipe,

Figure 2 is an exploded perspective view showing a backflow prevention device of the sewer pipe according to the present invention,

3 is a combined perspective view showing the backflow prevention device of the sewer pipe according to the present invention,

Figure 4a and 4b is an exploded perspective view and a combined perspective view of the frame portion according to the present invention,

Figure 5 is a partially exploded perspective view showing a fixed drainage according to the present invention,

6 is an enlarged perspective view showing the descent and drainage according to the present invention;

7 is a perspective view of the frame portion and the lifting and drainage combination according to the present invention;

8a and 8b is a perspective view of the operation of the fixed drainage and elevating drainage in accordance with the present invention,

9 is a cross-sectional view taken along the line A-A of FIG.

10 is an operation according to FIG.

11 is a state of use of the backflow prevention device of the sewer pipe according to the invention,

<Description of Symbols for Main Parts of Drawings>

10: backflow prevention device 11: frame part

12: fixed drainage 13: up and down drainage

100: underground 111: elevating frame

111a: Slide hole 111b: Side wing

111b ': Fastening bolt 111b ": Fastening hole

111c: Upper wing 111c ', 112a': Bolt hole

112,112 ': Frame cover 112a: Bolt

112b: tension spring 112c, 132a: fastening ring

112'a: Hanging protrusion 112d: Elastic spring

121: drain hole 122: insertion hole

122a, 301a: Female thread 131: Lifting hole

132: lifting projection 132b: fixed protrusion

133: water collecting part 133a: bottom plate

133b: drainage hole 200: catchment manhole

201: drain slope 202: drain pipe

203: step 204: detachable groove

300: grating 301: fixing hole

400: long bolt 401: male thread

500: Nut

The present invention relates to an apparatus for preventing backflow of sewage pipes, and in particular, it is operated by lifting and lowering according to the amount of sewage introduced, and the amount of drainage is appropriately adjusted according to the amount of sewage to prevent backflow due to a large amount of sewage. It relates to a backflow prevention device of the sewer pipe to make it possible.

In general, a water collecting manhole is provided on a road adjacent to a surface on which a roadway boundary stone is in contact with a roadway and a sidewalk, and the water collecting manhole is generally provided with a water collecting manhole made of a plastic material, and the water collecting manhole is disposed at an upper portion thereof. Grating is installed.

However, when the sewage rate increases rapidly due to torrential rain or other external requirements, the sump flows into the catchment manhole through the grating and flows back to the road instead of flowing down the sewer pipe. There was a problem that can cause accidents of vehicles running on the road.

Korean Utility Model Registration No. 20-0312015 has been proposed to compensate for this problem.

A typical example of such a conventional backflow preventing collection manhole of a sewage pipe is shown in FIG. 1.

In Fig. 1, reference numeral 1 denotes a grating, 2 denotes a barrier fastening frame, 3 denotes a backflow prevention membrane, 4 denotes a collecting manhole, and 5 denotes a sewer pipe.

As shown therein, the grating 1 and the sewer pipe 5 which are fastened to the upper portion of the sewage pipe 5 and the water collecting manhole 4 formed to correspond to both sides of the water collecting manhole 4 and the fastening film fastening frame 2 are fastened. It consists of a backflow prevention plate 3 which is rotated to prevent a backflow to the prevention film fastening frame (2).

When the sewage as described above does not flow along the sewage pipe 5 and flows back to the upper portion of the collecting manhole 4, the backflow prevention film 3 is rotated upward by the sewage, where the water level rises, and the ends thereof come into contact with each other to grate (1). By blocking the lower part of the to prevent backflow.

However, the conventional structures as described above also increase the flow rate when the amount of sewage is large, at which time the sewage introduced through the grating does not flow through the sewer pipe due to the large amount of sewage in a short time at a high flow rate so that a reverse flow occurs. There is a problem that, even if the backflow prevention film is formed to prevent the backflow, there is a problem that the sewage flows through the gap between the contact where the backflow prevention film is weak because the close contact force is weak.

Accordingly, the present invention has been made in view of the problems of the prior art as described above, in order to prevent the backflow of sewage through the sewage pipe, the fixed drainage with the upper part closed in the catchment manhole buried in the ground, primarily to reverse the flow It is an object of the present invention to provide an apparatus for preventing backflow of sewage pipes that is improved to prevent them.

In addition, another object of the present invention is the lifting and drainage drainage drainage body is wrapped around the fixed drainage located in the collecting manhole forming a lifting hole in the center is moved up and down along the fixed frame, the lifting and drainage is a lifting hole The purpose of the present invention is to provide a backflow prevention device of the sewer pipe which is improved to prevent the backflow of the sewage pipe which is closed by the bottom plate except the bottom plate and flows back to the drain pipe of the collecting manhole to prevent the course of the sewage rising along the fixed drainage.

In addition, another object of the present invention is to move down and down along the fixed drainage according to the amount of sewage, the lifting and drainage to collect the inflow sewage, the drainage through the drainage hole of the fixed drainage is formed in a different size appropriately drainage It is an object of the present invention to provide an apparatus for preventing backflow of sewage pipes improved to be possible.

In order to achieve the above object, the present invention is buried in the ground to collect the sewage, the drain pipe is formed on the drain slope for drainage at the bottom, the upper end of the catchment manhole protruding outward, the end of the catchment manhole In the catchment manhole made of a grating formed in the jaw to form a foreign matter manure and sewage flow,

It is fixed so as to face four inner walls of the collecting manhole, and the slide hole is opened at the front and penetrates up and down in the center, and fastening holes for fixing to the detachable groove formed on the inner wall of the collecting manhole on both sides of the slide hole. The side wing is provided,

The upper wing and lower wing of the slide hole and the upper wing and the lower wing which is provided with bolt holes are composed of the elevating guide frame formed on both sides of the slide hole, while being fixed to the upper wing of the elevating guide frame to close the slide hole The frame cover of the shape is fixed with bolts, both sides of the frame cover is provided with a bolt hole through which the bolt is inserted, the lower center is formed with a fastening ring for connecting one end of the tension spring, while the lower wing is formed with a locking projection elastic The frame part where the bottom of the spring is inserted into the four bolts of the frame cover is fixed with bolts,

It is settled on the inner bottom of the collecting manhole where the frame part is installed, and is generally '×' shaped and the center part is inserted into the fixing hole of the grating, and the protruding long bolt is fastened to communicate with it from the top to the bottom so that it is fixed with a nut. The insertion hole is formed, the end is disposed so as to face the frame portion, the inside is hollow, the top is closed and the bottom is formed in the shape of a rectangular box formed so as to open, both sides of the fixed drainage is provided with a plurality of drainage holes and ,

Connected to the elevating induction frame of the frame part while being fitted to the fixed drainage, the elevating hole is formed in the center so as to slide up and down and drain the sewage, while being inserted into the fixed drainage of the '×' shape. At the end of the elevating hole is inserted into the slide hole of the elevating frame,

The fastening ring connecting the other end of the tension spring connected to the frame cover fixed to the upper wing of the elevating guide frame is fixed to the upper part, and the upper part of the elastic spring fixed to the lower part is fitted to the locking projection of the frame cover fixed to the lower wing. The lifting projection having a fixed projection is provided on the other hand, the bottom except for the lifting hole is formed in the bottom plate for collecting water to form a collecting portion, the drain hole is connected to the lifting hole to drain the sewage collected in the collecting portion Consisting of the rising and lowering drainage is formed to provide a backflow prevention device of the sewer pipe.

The preferred embodiment of the present invention as described above in detail based on the accompanying drawings as follows.

2 is an exploded perspective view showing a backflow prevention apparatus of the sewer pipe according to the present invention, Figure 3 is a combined perspective view showing a backflow prevention apparatus of the sewer pipe according to the present invention, Figures 4a and 4b is a frame according to the present invention 5 is a partial exploded perspective view showing a fixed drainage system according to the present invention, FIG. 6 is an enlarged perspective view showing a lifting drainage body according to the present invention, and FIG. 7 is a frame part according to the present invention. 8A and 8B are operating perspective views of the fixed drainage and the lifting drainage according to the present invention, FIG. 9 is a cross-sectional view taken along line AA of FIG. 3, and FIG. 10 is an operation view of FIG. 9. 11 is a state diagram of the use of the backflow prevention device of the sewer pipe according to the invention.

2 to 3, the sewage is collected in the underground 100 to collect the sewage, the drain pipe 202 is formed on the drain slope 201 for smooth drainage at the bottom, the upper stepped portion A grating 300 is formed on the stepped portion 202 of the water collecting manhole 200 to form a collecting manhole 200 protruding to the outside, and the grating 300 is formed so that foreign matter manure and sewage flow into the collecting manhole 200.

Such, the frame portion 11 is fixed to the four places bolted to the inner wall of the collecting manhole 200 facing each other consists of the elevating induction frame 111 and the frame cover 112, elevating induction frame 111 The front of the center is opened and the upper and lower slide holes 111a are formed, and fastening bolts 111b 'for fixing to the inner wall detachable grooves 204 of the collecting manhole 200 on both sides of the slide holes 111a. Side wings 111b having fastening holes 111b ", which are fastened to each other, are formed on the upper and lower ends of the slide holes 111a, and are formed with an upper wing 111c having bolt holes 111c '. ) And the lower wing 111d are formed on both sides of the slide hole 111a.

2 to 4b, the plate-shaped frame cover 112 fixed to the upper wing 111c of the elevating induction frame 111 to close the slide hole 111a has bolts 112a on both sides thereof. ) Is provided with a bolt hole (112a ') is inserted, the lower center is formed of a fastening ring (112c) is connected to one end of the tension spring (112b), the lower wing (111d) is a locking projection (112' a) is The frame portion 11 is formed of four sets of frame portions 112 'which are formed and the lower end of the elastic spring 112d is inserted into the bolts.

In addition, when the elevating induction frame 111 is projected in a plane shape as a whole '투영' shape, both ends protruding forward are bent at right angles to face each other to form a slide hole (111a) with the front open, The upper and lower ends of the elevating induction frame 111, which extends on both sides of the slide hole 111a and the side wings 111b are formed, are integrally formed so as to extend to the ends of the side wings 111b in a predetermined area.

In addition, the frame cover (112, 112 ') can cover the upper wing (111c) and lower wing (111d) of the elevating induction frame 111 through the bolt 112a' formed in the bolt hole (112a ') formed on both sides. It is to be fastened and fixed to the bolt holes (111c ', 111d') provided in the upper wing (111c) and the lower wing (111d) of the elevating induction frame (111).

That is, the elevating induction frame 111 is in close contact with the inner wall surface of the collecting manhole 200, and then fastening holes 111b formed in the side wings 111b of the elevating induction frame 111 using the fastening bolts 111b '. It is configured to be fixed to the removable groove 204 of the catchment manhole 200 at regular intervals by inserting into the ").

In addition, the elevating induction frame 111 and the frame cover 112 of the frame portion 11 may be formed of an FRP material having excellent durability.

As shown in Figures 2 and 5, the fixed drainage body 12 of the present invention is placed on the inner bottom of the water collecting manhole 200 is installed frame portion 11, the planar shape as a whole 'x' shape and the center After being inserted into the fixing hole 301 of the grating 300, the protruding long bolt 400 is screwed to communicate with the upper part to the lower part so as to be fixed by the nut 500, and an insertion hole having a female thread 122a formed on an inner circumferential surface thereof ( 122).

That is, the fixed drainage body 12 of the present invention is fixed to the grating 300 by a long bolt 400, the outer circumferential surface of the bottom of the fixed drainage body 12 is to be seated on the drain inclined surface 201 of the catchment manhole 200 do.

And the end is disposed to face the frame portion 11, the inside is hollow, the top is closed and the bottom is formed in the shape of a rectangular box formed to open, both sides are provided with a plurality of drain holes 121.

That is, the fixed drainage body 12 is closed on the outer circumferential surface of the cylindrical column formed with the insertion hole 122, the inside is formed in a hollow state, the lower portion is configured so that the open rectangular box shape 'x' arrangement.

In addition, both sides of the rectangular box is provided with a plurality of rows in the transverse direction and the longitudinal direction, the drain hole is located in the upper portion of the diameter is smaller, the four rows of drain holes 121 are formed in a larger diameter toward the bottom.

As shown in Figure 2 and 6, the elevating drainage body 13 of the present invention is connected to the elevating induction frame 111 of the frame portion 11 in a state of being fitted to the fixed drainage (12) and the sewer Meanwhile, a 'x'-shaped lifting hole 131 penetrates up and down in the center so as to slide into the fixed drainage body of' × 'shape, and at the end of the lifting hole 131. The lifting projection 132 is fitted into the slide hole 111a of the lifting induction frame 111.

And the lifting projection 132 has a fastening ring (132a) is connected to the other end of the tension spring (112b) connected to the frame cover 112 fixed to the upper wing (111c) of the elevating induction frame (111) on the top. The fixing protrusion 132b, which is fixed to the upper portion of the elastic spring 112d having the lower portion fixed to the locking protrusion 112'a of the frame cover 112 'fixed to the lower wing 111d, is fixed to the lower portion. It is.

Meanwhile, the tension springs 112b and the elastic springs 112d connected to the upper and lower portions of the elevating drainage 13 serve to restore and support the elevating drainage 13, respectively.

In addition, the bottom plate 133a is formed on the floor except for the raising and lowering hole 131 to form a collecting portion 133, and the lowering hole 131 to drain the sewage collected in the collecting portion 133. The drain hole 133b communicated with each other is formed.

The lifting hole 131 is formed to penetrate from the top to the bottom in the same shape when projected onto the fixed drainage body 12 in a planar manner, and the lifting hole 131 wraps around the fixed drainage body 12 to the outside. It is configured to be moved up and down spaced apart from the fixed drainage body 12 at a predetermined interval.

In addition, the elevating protrusion 132 is formed at each end of the elevating hole 131, such, the elevating protrusion 132 is fitted into the slide hole 111a of the frame portion 11 elevating induction frame 111 It is configured to be supported and lifted up and down along the slide hole (111a).

In addition, the water collecting unit 133 is configured to form a bottom plate 133a in the bottom portion excluding the portion of the elevating hole 131 so that the sewage can be contained, the elevating hole 131 and the bottom plate 133a. The drainage hole 133b communicates with the lower portion of the mating portion so that the sewage collected in the water collecting part 133 can be drained through the drainage hole 133b.

As shown in FIGS. 8A and 8B, the elevating drainage body 13 is positioned above the fixed drainage body 12 when no sewage flows or a small amount of sewage flows into the elevating drainage body 13. When a large amount of sewage flows into the sewage, the sewage is collected in the water collecting unit 133, and at the same time, as the elevating drainage body 13 descends due to the weight of the sewage, the drainage hole 133b and the fixed drainage of the elevating drainage body 13 The drainage holes 121 of 12 are configured to communicate with the sewage through the hollow interior of the fixed drainage body 12.

Referring to the operation of the present invention configured as described above are as follows.

9 to 11, the backflow prevention device 10 is installed by embedding the catchment manhole 200 in the ground (100), the frame portion 11, fixed drainage body 12, elevating drainage body (13), the grating 300 is arrange | positioned and installed.

Then, when the sewage introduced through the grating 300 is introduced, the sewage flows into the elevating drainage body 13, and the sewage is collected in the water collecting unit 133, and the elevating drainage body due to the weight of the sewage ( 13 is lowered to the bottom so that the drainage hole 133b of the elevating drainage body 13 and the drainage hole 121 of the fixed drainage body 12 communicate with each other so that the sewage is drained through the inside of the hollow state of the fixed drainage body 12. It is composed.

In addition, the drainage hole 121 formed in the upper portion formed in the fixed drainage body 12 and having a larger diameter toward the lower portion of the drainage water is collected in the water collecting portion 133 of the elevating drainage body 13 when the amount of sewage flowing in is small. The lower the weight of the fixed drainage body 12 while being lowered is to be drained through a small drain hole 121.

And, the upper portion formed in the fixed drainage body 12, the drain hole 121 formed with a smaller diameter toward the lower portion is the sewage that is collected in the water collecting portion 133 of the elevating drainage body 13 when the amount of sewage flowing in is large As the weight of the heavy is lowered to the bottom is drained through the large drain hole 121 of the diameter of the fixed drainage body 12 is introduced along the drainage slope 201 of the collecting manhole 200 is drained to the drain pipe 202 The process allows for fluid drainage depending on the amount of sewage.

At this time, the fixed drainage body 12 is positioned at the top of the drainage pipe 202 in the water collecting manhole 200, and for the smooth flow of sewage drained through the hollow state of the fixed drainage body 12, The drain is naturally drained by the drain slope surface 201 so that the bottom is inclined downward.

In addition, even if the fixed drainage body 12 is located above the drain pipe 202 of the collecting manhole 200, and the sewage flows back through the sewer pipe connected to the drain pipe 202 of the collecting manhole 200, the fixed drainage body 12 It flows out to the drain hole 121 of the first to block the direct flow back to the top, and to delay the back flow time.

In addition, when the sewage flowed back through the sewer pipe connected to the drain pipe 202 of the catchment manhole 200 is filled into the catchment manhole 200 through the fixed drainage body 12, the lifting and lowering drainage body 13 is fixed drainage body ( 12) is in close contact with the bottom plate is closed by the bottom plate (133a), and serves to block backflow sewage secondary.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

As described above, the present invention has an improved effect to prevent backflow primarily by placing a fixed drainage with the upper part closed in a collecting manhole buried in the ground to prevent sewage flowing back through the sewer pipe.

Then, the lifting and drainage drainage draining body wrapped around the fixed drainage located in the collecting manhole forms a lifting hole in the center of the lifting and lowering direction up and down along the fixed frame. The plate is closed by a drainage pipe of the collecting manhole and is prevented from flowing back along the stationary drainage, thereby improving the secondary flow.

In addition, the elevating drainage body is fixed, improves the bearing capacity to allow the elevating and descending, it is fitted into the frame portion in order to prevent being pushed upward by the sewage flow back through the sewer pipe so that the elevating can be raised and lowered There is an improved effect.

In addition, the lifting and lowering drainage to collect the incoming sewage is moved downward along the fixed drainage according to the amount of sewage, to prevent the vortex of the drainage through the drainage holes of the fixed drainage, each of which is formed in a different size to improve the drainage properly Has become effective.

Claims (2)

Buried in the ground (100) to collect sewage, the bottom is a drain pipe 202 is formed on the inclined drain surface 201 for drainage, the upper end of the stepped portion 203 forms a catching manhole 200 protruding outwards In the catchment manhole made of a grating 300 formed in the stepped portion 203 of the catchment manhole 200 to form a foreign matter manure and sewage flow, It is fixed to face four inner walls of the collecting manhole 200, and a slide hole 111a which is opened forward and vertically penetrated in the center is formed, and the inner wall of the collecting manhole 200 is formed at both sides of the slide hole 111a. A side wing 111b provided with a fastening hole 111b "for fixing with a fastening bolt 111b 'to a detachable groove 204 formed therein, Lifting and lowering induction frame formed on both sides of the slide hole (111a) and the upper wing (111c) and the lower wing (111d) having a bolt hole (111c ') and extending on the upper and lower ends of the slide hole (111a) On the other hand, a plate-shaped frame cover 112 is fixed to the upper wing 111c of the elevating induction frame 111 to close the slide hole (111a) is fixed by a bolt (112a), the frame Both sides of the cover 112 is provided with a bolt hole 112a 'through which the bolt 112a is inserted, and at the lower center, a fastening ring 112c to which one end of the tension spring 112b is connected, 111d) is formed with a locking projection (112 'a) is a frame portion 11 is a four-piece frame frame 112' is fixed to the bolt to the frame cover 112 'is inserted into the bottom of the elastic spring (112d), It is placed on the inner bottom of the catchment manhole 200 in which the frame part 11 is installed, and the overall bolt is protruded after being inserted into the fixing hole 301 of the grating 300. Is communicated from the top to the bottom to be fixed by the nut 500, the insertion hole 122 is formed with an internal thread (122a) on the inner peripheral surface, the end is disposed so as to face the frame portion 11, the inside is hollow The upper part is closed and the lower part is formed in a rectangular box shape, the fixed drainage body 12 is provided with a plurality of drain holes 121 on both sides, Connected to the elevating induction frame 111 of the frame portion 11 in a state of being fitted to the fixed drainage body 12, the elevating and draining the sewage, while in the center so as to slide into the 'x'-shaped fixed drainage body 12 The elevating hole 131 of the 'x' shape is formed through the upper and lower, and is fitted into the slide hole 111a of the elevating induction frame 111 at the end of the elevating hole 131, The fastening ring 132a to which the other end of the tension spring 112b connected to the frame cover 112 fixed to the upper wing 111c of the elevating induction frame 111 is fixed to the upper portion of the lower wing 111d The lifting protrusion 132 having a fixing protrusion 132b to which the upper portion of the elastic spring 112d having the lower portion is fixed to the locking protrusion 112'a of the frame cover 112 'fixed to the upper portion is provided. The bottom plate 133a is formed on the floor except for the raising and lowering hole 131 to form the collecting portion 133 and communicates with the raising and lowering hole 131 so that the sewage collected in the collecting portion 133 is drained. Backflow prevention device of the sewer pipe, characterized in that consisting of the elevating drainage body 13 is formed is formed drainage hole (133b). According to claim 1, the fixed drainage body 12 is provided with a plurality of rows of drain holes 121 formed in both sides in the transverse direction and the longitudinal direction, the drain hole located in the upper diameter is smaller, the diameter toward the bottom This large drainage hole 121 is formed to facilitate the drainage according to the amount of sewage collected in the elevating drainage body 13, characterized in that the backflow prevention device of the sewer pipe.

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