JP2999152B2 - Check valve used for water pipe structure of small diameter pipe propulsion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-diameter pipe propulsion apparatus for propelling a small-diameter pipe while correcting its direction underground.
Pipe structure that can send water to the tip of the pipe to be propelled,
And a check valve used for the pipe structure.

[0002]

2. Description of the Related Art Conventionally, for a small diameter pipe whose direction can be corrected, there is a technique disclosed in Japanese Utility Model Publication No. 58-35756. In this method, a target plate was fixed to the inside near the rear part of the front conduit, a light emitting diode was provided on the target plate, and a small-diameter tube could be connected to the rear end of the front conduit via a pipe joint. Japanese Patent Application Laid-Open No. HEI 2 (1995) discloses a structure having a structure for injecting water from near the tip of the propulsion pipe.
There is a technique disclosed in Japanese Patent Application No. -161096. This has a built-in nozzle that sprays water on the opposite side of the oblique pressure receiving surface in order to improve the efficiency of direction correction, and a water jet nozzle is provided inside the propulsion head and propulsion pipe. In this case, an insertion hole for a water supply hose for supplying water was formed.

[0003]

However, in the former device, the light emitting diode is provided inside the front conduit, so that the light emitting diode has a small diameter to allow the light of the light emitting diode to pass therethrough. The tube had to be hollow and water could not be delivered to the tip using the inside of the small diameter tube. Therefore, in the case of propulsion into the ground, if the underground soil to be propelled is relatively hard, the propulsion using only the pressing force of the hydraulic jack may be slow and take a long time. Therefore, a structure of a small-diameter pipe capable of softening the soil by discharging water from the tip has been desired. In the latter case, although water can be injected from the propulsion head, a water supply hose for supplying water must be inserted between the propulsion head and the propulsion pipe (small diameter pipe), and the propulsion direction It was not possible to use a light emitting diode such as the former to confirm the above.

[0004] In view of the above, the applicant has proposed a structure in which a small-diameter tube has a double structure, in which light for direction correction is passed through the inner tube and water flows between the outer tube and the inner tube. Although the application has already been filed (Japanese Patent Application No. 7-204418), water spouted from a spout provided at the tip of the small-diameter pipe does not penetrate into the ground due to the condition of the underground where the small-diameter pipe should be propelled. In some cases, when the supply of water was interrupted to add small diameter pipes, water that did not permeate into the ground sometimes flowed back from the spout together with the surrounding mud.

In view of the above points, the present invention enables water supply and light passage inside a small-diameter pipe, and a pipe structure in which muddy water does not flow backward from a jet port at the tip, and
It is an object to provide a check valve for this tube structure.

[0006]

In order to achieve the above object, the present invention provides a small diameter pipe to be propelled by using a double pipe structure.
Allows water to pass through the gap between the outer and inner pipes,
The fountain opening that opens outside near the tip of the propulsion head
Inside the fountain, and continuous with the above water-permeable gap.
Pipe structure of a small-diameter pipe propulsion device comprising a flowing water channel
In the above, a non-return portion main body that can be fitted into the water channel,
The above-mentioned drainage channel is placed at several places on the concentric circle from the center of the check section main body.
Water holes penetrating along the direction of
Tongue-shaped cross section so that head side opening can be closed at the same time
And a substantially annular packing having a portion.
It consists of a support part to be supported by the check body at the center of the ring
The gist of the present invention is a check valve used for a water pipe structure .

[0007]

[0008]

[0009]

[0010]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is used for an apparatus for propelling a small-diameter pipe underground.
The outline of this small-diameter pipe propulsion device will be described. As shown in FIG. 1, the small-diameter pipe propulsion apparatus 1 has a propulsion unit 2 installed at the center, and can be moved by hydraulic cylinders 3 and 4 connected to a hydraulic compressor.
Since the hydraulic cylinders 3 and 4 are provided so as to slide along rails 6 and 7 provided on the base 5, the propulsion unit 2 is moved along the rails 6 and 7. Can be moved. A water supply adapter 9 for supplying water into the small-diameter pipe 8 is provided below the propulsion unit 2. The water supply adapter 9 transmits the rotational force of the hydraulic motor 10. Therefore, the water supply adapter 9 and the small-diameter pipe 8 connected thereto can be rotated by the driving force transmitted inside the propulsion unit 2. A propulsion head 11 is connected to the head of the small-diameter pipe 8, and the tip of the propulsion head 11 is cut obliquely so that its direction can be corrected in the ground. A transit 12 is provided behind the propulsion unit 2 so that the inside of the propulsion head 11 can be confirmed through the hollow inside of the small-diameter tube 8. In addition, the small-diameter pipe propulsion device 1 can connect the screw 13 and the buried pipe 14 after propelling the small-diameter pipe 8 and pipe the buried pipe 14 by excavation.

Next, this embodiment will be described. FIG.
As shown in the figure, the small diameter pipe 8 has a double pipe structure,
The outer diameter of the inner pipe 21 is made smaller than the inner diameter of the outer pipe 22 to provide a gap so that water can pass through the gap. The inner pipe 21 and the outer pipe 22 are successively added so that water supplied from the small-diameter pipe propulsion device 1 (FIG. 1) can be sent. The propulsion head 11 includes a light emitting unit 3
1 can be built-in.
Substantially cup-shaped body and three light emitting diodes 32, 3
3 and 34, and a power supply 35 for energizing the power supply. The power supply 35 is provided inside the cup-shaped main body, and the light-emitting diodes 32, 33, and 34 are provided on a circular plate member 36 that closes the mouth of the cup-shaped main body. Can emit light from the plate member 36 toward the small-diameter pipe propulsion device 1 (FIG. 1). A plurality of grooves 38 are provided on the main body surface of the light emitting unit 31 along the propulsion direction.
The main body 37 has a hole shape through which water can pass. Further, the propulsion head 11 is provided with a fountain port 39 which is open outside near the tip, and a flowing water channel 40 (40a, 40b) in which the fountain port 39 and the groove 38 around the light emitting portion 31 are continuous. , 40c)
Are provided inside the propulsion head 11. And
A check valve 41 is screwed in the middle of the flowing water channel 40,
A water hole 42 for regulating the flow of water in the water channel 40;
A packing 43 for closing the outlet of the water hole 42 is provided. The packing 43 opens the outlet of the water hole 42 when water pressure acts toward the tip of the propulsion head 11.

Here, the check valve 41 will be described in detail. As shown in FIGS. 3 and 4, the substantially cylindrical main body 44 has a male screw engraved on almost the entire outer surface thereof, and can be screwed and mounted on a female screw inside the propulsion head 11. (See FIG. 2). Further, a plurality of water passage holes 42 penetrating in parallel to the axis of the substantially cylindrical body 44 are provided at an equal distance from the axis center (see FIG. 4B), and are arranged in the axial direction. It allows water to pass through. At one end of the main body 44, projecting pieces 45 are provided at four places of a circular edge.
When the light emitting unit 31 (FIG. 2) comes into contact with the end face,
The water passage hole 42 opened at the end face is configured not to be closed. At the other end, there is provided a concave portion 46 that is continuous with the water passage hole 42. The concave portion 46 is configured to have an inner diameter such that the annular rubber packing 43 can be fitted without play. . A screw hole 47 is provided at the center of the concave portion 46, and a fixing screw 49 is screwed into the screw hole 47 while a holding member 48 is brought into contact with the vicinity of the center of the annular packing 43. 43 can be held. Here, of the annular packing 43, the peripheral edge portion 43a that cannot be held by the holding member 48 is a free end having a tongue-shaped cross section (see FIG. 4C), and The water passage hole 42 of the main body 44 is provided so as to be continuous near the inner wall of the concave portion 46, so that when water is not passed through the water passage hole 42, the tongue-shaped end 43 of the annular packing 43 is provided.
a contacts the inner wall of the recess 46 to close the outlet of the water hole 42, and when water is forced to flow, the tongue-shaped end 43a curves inward to open the outlet of the water hole 42. It is supposed to.

Next, the water channel 4 in the propulsion head 11
The relationship between 0 and the check valve 41 will be described with reference to FIGS. As described above, the check valve 41 is provided with a male screw so that it can be screwed into the propulsion head 11. As shown in FIG. 5, a space is formed in the flow channel 40 inside the propulsion head 11 (between 40a and 40b) so that the check valve 41 can be fitted therein. A female screw is screwed into the male screw. Then, by screwing the check valve 41 into the female screw, the check valve 41 can be provided in the middle of the flowing water channel 40. Therefore, as shown in FIG. 6, in the flowing water channel 40 to which the check valve 42 is screwed, the front 40 a of the check valve 41
, And 40b, 40c ahead of the check valve 41, and both of them are connected only by the water hole 42 provided in the check valve 41. Therefore, the annular packing 43 that can close the outlet of the water hole 42 can adjust the water flowing state and the cutoff state. Further, as described above, since the annular packing 43 is made of rubber, the tongue-shaped end 43a (FIG. 4) is urged so as to close the outlet of the water hole 42. When there is running water having a pressure exceeding the pressure, the tongue end 43a of the annular packing 43 is curved to allow water to flow. However, this tongue piece end 43
The biasing force of a is not large, but is such that it bends when forced water flows and closes the outlet when it stops.

As described above, when water is supplied from the water supply adapter 9 while the small-diameter pipe 8 is continuously connected, the propulsion head 11
Water can be supplied to the fountain port 39 near the tip of the tub, and water can be spouted from the fountain port 39. In addition, the supply of water from the water supply adapter 9 for performing the work of adding the small-diameter pipe 8 is performed. When stopping, the propulsion head 1
The muddy water from the ground located in the vicinity of 1 stops at the water passages 40b and 40c in the propulsion head 11 and does not flow into the gap between the small-diameter pipes 8 having the double structure.

It goes without saying that various embodiments can be adopted without departing from the spirit of the present invention. For example, in the above embodiment, the small-diameter tube 8 has a double tube structure, and the inside of the inner tube 21 is the light emitting diode 3 of the light emitting unit 31.
Although only the configuration used for passing the light of 2, 33, 34 has been described, it may be used for other purposes. The gap between the tube 21 and the outer tube 22 may be used for other purposes. In addition, a small-diameter pipe is, of course, a pipe for leading the screw in the auger method,
It also includes a pipe that can be used as a normal gas pipe or the like when propelled.

[0016]

As is evident from the foregoing description, the present invention is small propelled
The bore tube has a double tube structure and passes through the gap between the outer tube and the inner tube.
Near the tip of the propulsion head that allows water and leads the small diameter pipe
A fountain opening outside of the fountain
Fork that constitutes a continuous flow channel in a gap that allows water to pass through
In the water pipe structure of the radial pipe propulsion device,
Check body that can be made and concentric circle from the center of this check body
Through the water flow channel at multiple locations above
Simultaneously close the water hole and the opening on the propulsion head side of this water hole
Substantially annular packing with tongue-shaped end section
And this packing to the check body at the center of the substantially annular shape.
And a supporting portion to be held
Since the check valve to be used as a summary, the fitting into the spillway
The plurality of water holes provided in the check body
Backflow is prevented by the packing of
The consumable part must be a tongue-shaped end of the packing
From long-term use by replacing the packing
That can withstand. And to the fountain
In order to adjust the flow rate, the concentric
By changing the number of water holes provided on the circle,
The total cross-sectional area of the water holes can be easily changed .

[0017]

[0018]

[0019]

[0020]

[Brief description of the drawings]

FIG. 1 is a perspective view of a small-diameter pipe propulsion device.

FIG. 2 is a sectional view of an embodiment of a water pipe structure.

FIG. 3 is an exploded perspective view of an embodiment of a check valve.

4A is a front view, FIG. 4B is a bottom view, and FIG. 4C is a cross-sectional view along IVC-IVC of the embodiment of the check valve.

FIG. 5 is an explanatory view of a water pipe structure using a check valve.

FIG. 6 is an explanatory diagram of a water pipe structure using a check valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small-diameter pipe propulsion device 8 Small-diameter pipe 9 Water supply adapter 11 Propulsion head 13 Screw 14 Buried pipe 21 Inner pipe 22 Outer pipe 31 Light emitting part 38 Groove 40 Flow channel 41 Check valve 42 Water hole 43 Ring packing 43a Tongue piece End 48 Holding member

Claims (1)

(57) [Claims] 1. A small diameter pipe to be propelled has a double pipe structure.
Allows water to pass through the gap between the outer and inner pipes,
The fountain opening that opens outside near the tip of the propulsion head
Inside the fountain, and continuous with the above water-permeable gap.
Pipe structure of a small-diameter pipe propulsion device comprising a flowing water channel
In the above, a non-return portion main body that can be fitted into the water channel,
The above-mentioned drainage channel is placed at several places on the concentric circle from the center of the check part body.
Water holes penetrating along the direction of
Tongue-shaped cross section so that head side opening can be closed at the same time
And a substantially annular packing having a portion.
It consists of a support part to be supported by the check body at the center of the ring
A check valve for use in a water pipe structure .