JP2000324669A - Drainage pipe for pit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage pipe which can prevent such a situation as a work cannot be carried out in a pit because water or sail and sand enters into a pit even when the level of surrounding ground water is high. SOLUTION: The drainage pipe 1 is formed by assembling a tubular body 2, a water stop ball 8 held freely movably in the body 2, upper and lower holding members 3a, 3b fixed, respectively, to the upper and lower parts of the body 2, a water stopping elastic member 5 joining with the water stop ball 8 to close the drain outlet 12 of the upper member 3a, a guide member 7, and a joint member 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain pipe provided in a pit buried underground.

[0002]

2. Description of the Related Art Electrical wiring, water pipes, gas pipes and the like buried underground are connected at connection pits provided at appropriate intervals, and maintenance and inspection work is performed in the connection pits. Is performed. A drain pipe is provided in such a connection pit, so that intrusion water (rainwater or the like) that has entered inside is drained from the drain pipe to the outside.

[0003]

However, when the level of surrounding groundwater is high, the connection pit described above
Water, sediment, etc. enter the interior from the drain pipe (that is,
There is a disadvantage that the maintenance and inspection work of the electric wiring cannot be performed.

[0004] An object of the present invention is to solve the problems in the pits such as the connection pits and to make it possible to work in the pits without water, earth and sand entering the pits even when the surrounding groundwater level is high. It is an object of the present invention to provide a pit drain pipe capable of preventing the situation from disappearing.

[0005]

According to a first aspect of the present invention, there is provided a drain pipe provided in a pit buried underground, comprising: a cylindrical main body; A water blocking ball having a specific gravity smaller than water movably held inside the main body, an upper holding member having a drain hole and holding the water blocking ball at an upper portion of the main body, and a lower portion of the main body having a drain hole and having a drain hole And a lower holding member that holds the water stopping ball, and a water stopping elastic member that joins the water stopping ball to close the drain hole of the upper holding member. According to a second aspect of the present invention, in the first aspect of the invention, the water-stopping elastic member includes a tubular portion inscribed in the drain hole of the upper holding member, One of the peripheral edges has a flange portion integrally provided so as to form an obtuse angle with the cylindrical portion. According to a third aspect of the present invention, in the first and second aspects of the invention, a filter is provided so as to cover an opening at a lower end of the main body. In addition, pits refer to connection pits for connecting electrical wiring, water pipes, gas pipes, etc., handballs for information boxes, various work grooves (pits) dug underground, such as common grooves. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drainage pipe for a connection pit (hereinafter simply referred to as a drainage pipe) according to the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show cross sections of a drain pipe. The drain pipe 1 is composed of a main body 2, an upper holding member 3a, a lower holding member 3b, a water-stopping elastic member 5, and a joint member 6. ,
It is formed by assembling the guide member 7 (the upper engaging member 3a and the lower engaging member 3b have the same shape). The water stopping ball 8 is held inside the main body 2 (between the upper engaging member 3a and the lower engaging member 3b) so as to be freely movable.

The main body 2 is made of a hard synthetic resin (vinyl chloride).
Is formed in a cylindrical shape. The upper engaging member 3a (lower engaging member 3b) has a cylindrical portion 9 as shown in FIG.
An upper flange body 10 and a lower flange body 11 are integrally extended at an upper end and a lower end, respectively, so as to form an angle of about 110 ° with the cylindrical portion 9 (note that the cylindrical portion 9 has a cylindrical shape). 9 has a drainage hole 12). On the outer surface of the upper flange body 11, a plurality of (9) mounting ribs 13, 1
.. Are erected radially from the center to the periphery, and a drainage passage 14 is provided between the adjacent mounting ribs 13. The upper flange body 10
Is substantially the same as the inner diameter of the main body 2, and the diameter of the lower flange body 11 is substantially the same as the outer diameter of the main body 2. The lower holding member 3b is attached to the main body 2 by fitting the upper flange body 10 inside the lower end of the main body 2.

FIG. 4 shows a water-stopping elastic member 5, which is made of hard rubber. A flange 16 is provided on one peripheral edge of the flat cylindrical portion 15 whose outer diameter is substantially the same as the inner diameter of the drainage hole 12 of the upper engaging member 3a (lower engaging member 3b).
It has a shape integrally attached to form an angle of about 110 ° with 5. The water stopping elastic member 5 is in a state in which the upper surface of the flange portion 16 is brought into contact with the outer surface of the lower flange body 11 of the upper holding member 3a by fitting the cylindrical portion 15 into the drain hole 12 of the upper holding member 3a. The upper holding member 3
a.

As shown in FIGS. 1 and 2, the guide member 7 is made of a hard synthetic resin (vinyl chloride).
The inner diameter is formed in a cylindrical shape having substantially the same size as the outer diameter of the main body 2. A flange-shaped locking rib 25 is provided substantially at the center of the cylindrical portion, and projects outward and inward along the outer and inner circumferences of the cylindrical portion. The guide member 7 is fitted outside the upper part of the main body 2 so that the lower surface of the locking rib 25 is in contact with the upper end surface of the main body 2. The upper holding member 3 a to which the water stopping elastic member 5 is attached is fitted into the guide member 7, and the lower flange body 1 of the upper holding member 3 a is fitted.
1 is in contact with the upper surface of the locking rib 25 of the guide member 7.

On the other hand, the joint member 6 is formed of a hard synthetic resin (vinyl chloride) into a cylindrical shape whose inner and outer diameters are substantially the same as the inner and outer diameters of the main body 2. It is screwed. The joint member 6 is fitted inside the upper part of the guide member 7, and the lower end thereof is in a state of being in contact with the upper surface of the lower flange body 11 of the upper holding member 3a.

Further, the water stopping ball 8 is formed of a hard synthetic resin (vinyl chloride) into a hollow spherical shape having a diameter larger than the inner diameter of the drain hole 12 of the upper engaging member 3a (lower engaging member 3b). I have. And it is movably held inside the main body 2 in a state of being dammed by the upper engaging member 3a and the lower engaging member 3b.

As shown in FIG. 5, the drain pipe 1 is installed in a connection pit 17 dug in the ground and used. The connection pit 17 is provided on the inner wall 1 made of concrete.
A drain pipe 1 extends through substantially the center of the lower surface of the pipe 8. Further, a mortar 20 is laid below the inner wall 18, and crushed stones 21 are laid below the mortar 20. On the other hand, a water pipe 23 made of hard synthetic resin (vinyl chloride) is provided below the drain pipe 1. A plurality of water guide holes 26 are formed in the water guide pipe 23. Further, a single-grained crushed stone 22 is laid around the water pipe 23. In addition, a cover 19 is provided above the connection pit 17 so as to be freely opened and closed.

In the drain pipe 1 installed in the connection pit 17 as described above, when the water level of the surrounding groundwater is low, as shown in FIG. The water is discharged to the outside through the drain hole 12 of the holding member 3a, the inside of the main body 2, and the drain hole 12 of the lower holding member 3b. In such a case, the water stopping ball 8 is mounted on the mounting rib 1 provided on the upper flange body 10 of the lower holding member 3b.
The lower holding member 3 is placed on the third holding member 3.
Since it is located above the drainage hole 12b, the intruding water W is discharged from the drainage channels 14, 14,. On the other hand, when the water level of the surrounding groundwater is high, the groundwater W enters the inside of the main body 2 from the drain hole 12 of the lower holding member 3b as shown in FIG. The drain hole 12 of the upper holding member 3a is closed by joining (by joining circumferentially) the lower surface of the flange portion 16 of the elastic member 5 for use. Therefore, the groundwater W is discharged from the drain pipe 1
Does not enter the connection pit 17 from above (that is, the backflow of the groundwater W does not occur). The drain pipe 1 is used when drainage in the connection pit 17 is unnecessary.
Using the screw groove 4 of the joint member 6, a lid member (not shown) can be detachably attached.

As described above, the drain pipe 1 has a cylindrical main body 2.
A water stop bulb 8 having a specific gravity smaller than water movably held inside the main body 2, an upper holding member 3 a having a drain hole 12 and holding the water stop bulb 8 at an upper part of the main body 2, a drain hole A lower holding member 3b having a lower portion 12 of the main body 2 and holding the water stopping ball 8; and a water stopping elastic member 5 joined to the water stopping ball 8 to close the drain hole 12 of the upper holding member 3a.
When installed in the connection pit 17, the intruding water W that has entered the connection pit 17
Can be efficiently discharged to the outside. Moreover,
Even when the level of the surrounding groundwater is high, the water stoppage ball 8 rises and joins with the waterstop elastic member 5 to close the drainage hole 12 of the upper holding member 3a, so that the groundwater W enters the connection pit 17. (The situation where the groundwater W flows backward)
Can be prevented.

Further, the drain pipe 1 includes a water stopping elastic member 5,
The cylindrical portion 15 inscribed in the drain hole 12 of the upper holding member 3a
And a flange 16 integrally provided at one peripheral edge of the cylindrical portion 15 so as to form an obtuse angle with the cylindrical portion 15, so that the raised water stopping spheres 8 have elasticity for stopping water. It is easy to be located at the center of the member 5, and the groundwater W
The accuracy of the backflow prevention function is very high. In addition, even if the water stopping elastic member 5 is deteriorated or damaged, it can be easily replaced.

Further, the drain pipe 1 has a lower manufacturing cost because the upper holding member 3a and the lower holding member 3b have the same shape and do not require different molding dies. In addition, since the drain pipe 1 is simply assembled with all parts without using screws or the like, if the parts are carried, it can be easily assembled even at the construction site of the connection pit 17. However, if some parts are damaged, they can be easily replaced.

In addition, the drainage pipe 1 is provided with a locking rib 25 standing upright on the guide member 7 and protruding outward along the outer periphery of the cylindrical portion of the guide member 7.
It hardly comes off from the concrete inner wall 18 and, furthermore, has a very high water stopping performance.

The configuration of the drainage pipe according to the present invention is not limited to the embodiment described above, but includes a main body, an upper holding member, a lower holding member, an elastic member for stopping water, a joint member, and a guide. The configuration such as the shape, structure, and material of the member and the water stopping ball can be appropriately changed as needed without departing from the spirit of the present invention.

For example, the drain pipe includes a main body, an upper holding member, a lower holding member, an elastic member for stopping water, a joint member,
The present invention is not limited to the one assembled with the guide member and the water stop ball, but may be one in which the joint member and the guide member are omitted, and the upper holding member is directly attached to the upper part of the main body. Further, the upper holding member and the lower holding member are not limited to those having the same shape, and the upper holding member and the lower holding member may have different shapes. in addition,
The main body and the upper and lower holding members are not limited to being separately provided. The main body may be provided with an upper holding member and / or a lower holding member integrally. Further, the lower holding member (upper holding member) is not limited to a member provided with a plurality of ribs as in the above embodiment.

Further, as shown in FIG. 7, it is possible to attach a filter formed of a nonwoven fabric at an appropriate position such as the lower end of the main body. When such a configuration is adopted,
The drain pipe does not allow earth and sand to enter the main body, and does not hinder the joining between the water-stopping ball and the water-stopping elastic member due to soil and the like. The backflow prevention function does not decrease. As the filter, a metal net or the like can be used in addition to the non-woven fabric. However, it is preferable that the filter is a non-woven fabric, because fine earth and sand can be reliably shut off. Further, the installation position of the filter is not limited to the lower side of the main body, but may be provided above the lower holding member.

On the other hand, the water stop bulb has an apparent specific gravity (bulk density).
Is smaller than water, the material is not limited to a hollow one, and may be a material formed of a synthetic resin having a lower specific gravity than water. In addition, when the water stopping ball is formed into a shape in which the inside is filled with a hard synthetic resin (for example, ebonite or the like), the water stopping ball becomes difficult to deform, and the joining area between the water stopping ball and the water stopping elastic member is increased. Therefore, even if the drainage pipe is used for a long time, the function of preventing the backflow of the groundwater into the connection pit does not decrease.

In addition, the water-stopping elastic member is not limited to the one in which the flange portion is integrally extended from the cylindrical portion, and may have another shape. Even when the water-stopping elastic member has a cylindrical portion with a flange extending therefrom, the angle formed between the cylindrical portion and the flange is not limited to 110 °. However, when the angle between the cylindrical portion and the flange portion is set in the range of 100 ° to 120 °, the joint area between the water stopping ball and the flange portion becomes large, and a function of preventing backflow of groundwater into the connection pit. The accuracy of
There is an advantage.

On the other hand, a mode in which a drain pipe is installed in a pit is also provided.
The present invention is not limited to a mode in which a water guide pipe is provided below as in the above embodiment, and can be appropriately changed as needed.

[0025]

According to the first aspect of the present invention, there is provided a drain pipe having a cylindrical main body, a water stopping ball having a specific gravity smaller than water, movably held inside the main body, and a drain hole. An upper holding member that holds a water stop ball at an upper portion, a lower holding member that has a drain hole and holds the water stop ball at a lower portion of the main body, and a stop that joins the water stop ball to close a drain hole of the upper holding member. Since it is made of the elastic member for water, when installed in the connection pit, the intruding water that has entered the connection pit can be efficiently discharged to the outside. In addition, even when the level of the surrounding groundwater is high, the water stopping ball rises and joins the water stopping elastic member to close the drain hole of the upper holding member, thereby preventing the groundwater from entering the connection pit. Can be.

According to a second aspect of the present invention, in the drain pipe, the water-stopping elastic member has a tubular portion inscribed in the drain hole of the upper holding member, and a tubular portion provided on one peripheral edge of the tubular portion. And the flange part integrally provided to form an obtuse angle, it is easy for the raised water stopping ball to be located at the center of the water stopping elastic member, and the function of preventing the backflow of groundwater into the connection pit Very high accuracy. In addition, even if the water stopping elastic member is deteriorated or damaged, it can be easily replaced.

The drain pipe according to claim 3 is provided with a filter so as to cover the opening at the lower end of the main body. Since the joint with the elastic member for use is not hindered, the function of preventing the backflow of the groundwater into the connection pit does not decrease even when used for a long time.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a state of a cross section of a drain pipe.

FIG. 2 is an explanatory diagram showing a state of a cross section of a drain pipe.

FIG. 3 is an explanatory view showing a lower holding member.

FIG. 4 is an explanatory view showing a water-stopping elastic member.

FIG. 5 is an explanatory diagram showing a state where a drain pipe is installed in a connection pit.

FIG. 6 is an explanatory diagram showing a use state of a drain pipe.

FIG. 7 is an explanatory diagram showing a state of a cross section of a drain pipe.

[Explanation of symbols]

1. Drain pipe, 2. Main body, 3a Upper holding member, 3
b. lower holding member, 4. screw groove, 5. elastic member for waterproofing, 6. joint member, 7. guide member, 8.
・ Water stop ball, 9 ・ ・ Cylindrical part, 10 ・ ・ Upper flange body, 11
..Lower flange body, 12 drainage hole, 13 mounting rib, 14 drainage channel, 15 cylindrical portion, 16 flange portion, 17 connection pit, 18 inner wall, 19 ..Cover, 20..Mortar, 21..Crushed stone, 22..Single-grained crushed stone, 23..Cover pipe, 24..Filter, 25..Locking rib, 26..Cover hole, W..Intrusion Water (groundwater).

Claims (3)

[Claims] 1. A drain pipe provided in a pit buried in the ground, comprising: a cylindrical main body; a water stopping ball movably held inside the main body, having a specific gravity smaller than water; and a drain hole. An upper holding member that holds a water stop ball at an upper portion of the main body, a lower holding member that has a drain hole and holds the water stop ball at a lower portion of the main body, and a drain hole of the upper holding member that is joined to the water stop ball Pit drainage pipe consisting of a water-stopping elastic member that closes off the pit. An elastic member for stopping water is provided on a cylindrical portion inscribed in a drain hole of the upper holding member, and on one peripheral edge of the cylindrical portion,
The pit drain pipe according to claim 1, comprising a cylindrical portion and a flange portion integrally provided so as to form an obtuse angle. 3. The pit drain pipe according to claim 1, wherein a filter is provided so as to cover an opening at a lower end of the main body.