JP2001296200A - Leakage detecting tube and head of leakage detecting tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leakage detecting tube of which inside can be cleaned easily and a leakage detecting tube head constituting an upper opening part of the leakage detecting tube. SOLUTION: The leakage detecting tube 11 comprises an outer tube 12, a length adjusting tube 13 and an inner tube 14 disposed on the inside of the outer tube 12, a pair of fixing bands 15 mounted on the upper edge of the outer tube 12, a detecting tube head 16 fixed to the upper end part of the length adjusting tube 13, and an intermediate cover 17 and an upper cover 18 for closing the detecting tube head 16. The inner tube 1 is inserted removably into the outer tube 12. The length adjusting tube 13 is inserted removably into the outer tube 12 and clamped by means of the pair of fixing bands 15. A threaded hole 42 is made in the center of the upper cover 18 and a press screw 44 for moving the upper cover 18 upward by pressing a protrusion 31 of the intermediate cover 17 is screwed into the threaded hole 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leak detecting pipe buried around an underground tank for detecting leakage of liquid in the underground tank and a leak detecting pipe head constituting an upper opening of the leak detecting pipe. It is about the department.

[0002]

2. Description of the Related Art Conventionally, as a leak detecting tube of this type, for example, a large number of small holes are penetrated in a lower peripheral surface of a detecting tube main body formed in a bottomed cylindrical shape and an upper end portion thereof is provided. There is known an apparatus having a substantially cylindrical detection tube head for detachably fitting a lid body. This leak detector tube is
Dry sand in a tank room type underground tank buried through a concrete tank as a tank room and dry sand between the surrounding soil and a directly buried underground tank directly buried in the surrounding soil It is usually buried in four places and used.
Then, when oil leaks from these directly buried or tank room type underground tanks, the oil can be collected in the detection tube main body from a small hole on the lower peripheral surface. Furthermore, by inserting a detection rod into the detection pipe periodically from the ground surface and confirming the adhesion of oil, oil leakage from the underground tank can be detected.

[0003]

However, in the conventional leak detecting tube buried around the direct buried underground tank, the leak detecting tube passes through a small hole in the lower peripheral surface of the detecting tube main body due to long-term use. Sand and mud entered the groundwater, etc., and accumulated inside the main body of the detection tube. When a large amount of sand, mud, or the like is deposited, the detection rod cannot be inserted, and the leak detection function may be lost.

[0004] In order to remove the deposits, an operation is performed in which while running water flows in from the upper opening of the detection tube main body with a hose, the deposits are plucked with a thin rod and they are forcibly discharged from a small hole. However, the work was very troublesome and could not be sufficiently cleaned. Furthermore, in order to sufficiently clean the inside of the sensing tube body, it is necessary to dig the sensing tube body once on the ground and perform the cleaning work, but it is almost impossible to dig the sensing tube body once buried. It was possible.

[0005] Also, in the leak detection tube buried in the dry sand around the tank room type underground tank, the surrounding dry sand slightly enters through a small hole in the lower peripheral surface of the detection tube main body. However, in this case, since the inside of the tank room is flooded, flowing water cannot be flowed in, and it is necessary to excavate and clean the main body of the detection tube. Since it is almost impossible to excavate the detection tube main body as in the case of the direct buried type, the leak detection tube cannot be cleaned.

On the other hand, the detecting tube head is configured to have an inner diameter smaller than the outer diameter of the detecting tube main body so that the detecting tube main body does not come off, so that the detecting tube head buried underground is provided. It had a structure in which the main body could not be taken out and cleaned.

The present invention has been made by focusing on the problems existing in the prior art as described above. An object of the present invention is to provide a leak detecting tube and a leak detecting tube head which can easily clean the inside of the tube.

[0008]

In order to achieve the above object, a leak detecting pipe according to the first aspect of the present invention is disposed around an underground tank, and detects leakage of liquid in the underground tank. Leak detection tube for the outer tube, comprising an outer tube and an inner tube through which a number of liquid inflow holes are penetrated, and a lid for closing an upper opening of the outer tube, and the inside of the outer tube The inner tube is inserted so that it can be inserted and removed.

A second aspect of the present invention provides the leak detecting tube according to the first aspect, wherein the outer tube is provided with a length adjusting tube so that the length of the outer tube can be adjusted. . According to a third aspect of the present invention, there is provided the leak detecting tube according to the first or second aspect, wherein the lid is constituted by an upper lid and a middle lid, and a screw hole is provided in the upper lid. A pressing screw for pressing the upper end of the inner lid to move the upper lid upward is screwed into the screw hole.

According to a fourth aspect of the present invention, there is provided a leak detecting tube head constituting an upper opening of the outer tube according to any one of the first to third aspects, It has an inner diameter larger than the outer diameter of the inner tube, and enables insertion and removal of the inner tube.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIGS. 1A and 1B, a leak detecting tube 11 includes an outer tube 12 and the outer tube 1.
2, a length adjustment pipe 13 and an inner pipe 14, a fixed band 15 provided at an upper end of the outer pipe 12, and a detection pipe head attached to an upper end of the length adjustment pipe 13. 16 and an inner lid 17 and an upper lid 18 for closing the detection tube head 16. The leak detecting pipes 11 are usually buried at four locations at positions surrounding a directly buried underground tank (not shown), and are provided to detect leakage of a liquid such as oil contained in the underground tank. .

The outer tube 12 is formed in a cylindrical shape from steel, stainless steel, or vinyl chloride, and has a structure in which earth and sand and the like hardly enter the inside of the outer tube 12. Further, a lower discharge hole 20 is formed in the outer peripheral surface of the outer tube 12 in a long hole shape. On the inner peripheral surface of the outer tube 12 located slightly above the lower discharge hole 20, an annular protrusion 21 is annularly projected to form a circular bottom engagement hole 21 a. I have. In addition, a large number of outer tube liquid inflow holes 22 are provided in the lower peripheral surface of the outer tube 12 in a circular shape so that liquid can be selectively passed therethrough.

A cylindrical length adjusting tube 13 made of steel, stainless steel or vinyl chloride is inserted through and fixed to the upper inner peripheral surface of the outer tube 12. A pair of left and right fixed bands 15 formed in a long rectangular plate shape and having a semicircular concave center are attached to the outer peripheral surface of the length adjusting tube 13. These fixing bands 15 hold and fix the outer peripheral surface of the length adjusting tube 13 by a pair of right and left fixing screws, and the lower end edge thereof is placed on the upper end edge of the outer tube 12, thereby lengthening the length. The fixing tube 13 is fixed at a predetermined position,
The entire length of the leak detection tube 11 can be adjusted.

An inner tube 14 made of steel, stainless steel or vinyl chloride and having a substantially cylindrical shape with a bottom is inserted through the inner peripheral surfaces of the outer tube 12 and the length adjusting tube 13 so as to be insertable and removable. An inner tube bottom 23 formed in an inverted conical shape is provided at the lower end of the inner tube 14 so that the inner tube 14 can be easily inserted. Further, the outer peripheral portion of the inner tube bottom 23 is fitted into the bottom engagement hole 21a,
The inner tube 14 can be easily aligned with the center position of the outer tube 12. In addition, a number of inner tube liquid inflow holes 24 are formed in the lower peripheral surface of the inner tube 14 in a circular shape so that liquid can be selectively passed therethrough. As shown in FIG. 3A, a take-out hole 25 is formed in the upper end of the inner tube 14 in a substantially rectangular hole shape.

As shown in FIGS. 1 and 2 (a), a substantially cylindrical sensing tube head 16 made of steel, stainless steel or vinyl chloride is attached to the upper end of the length adjusting tube 13. Have been. A circular head fixing hole 26 (the inner peripheral surface is a female screw) is formed in the lower peripheral surface of the detection tube head 16.
And the head fixing screw 27 is screwed into each head fixing hole 26 so that the detecting tube head 16 is connected to the length adjusting tube 1.
3 is fixed to the outer peripheral surface of the upper end.

On the inner peripheral surface of the central portion of the detector tube head 16,
An inner lid insertion section 28 is provided, and an inner lid insertion section 28 is provided.
An annular flange receiver 28a is recessed at the upper end of the
The inner lid 17 can be inserted and fixed. Further, the upper end portion of the detection tube head 16 is provided with an upper lid insertion portion 29 formed in a tapered shape that is widened and slightly expands upward, so that the upper lid 18 can be inserted and fixed. In addition, this detector tube head 1
The inner diameter of the inner tube 14 is larger than the outer diameter of the inner tube 14 so that the inner tube 14 can be inserted and removed.

The inner lid 17 is made of steel, stainless steel, or vinyl chloride and has a cylindrical shape with a bottom, and a truncated cone-shaped convex portion 31 protrudes at the center thereof. A peripheral flange 32 slightly protruding in the lateral direction is provided on the upper end edge of the inner lid 17, and the inner lid 17 is inserted into the inner part of the inner lid insertion portion 28 by being engaged with the flange receiver 28a. Is to be prevented. In addition, an inner lid packing 33 formed in an annular shape with rubber or silicone resin is attached to the outer peripheral surface of the central portion of the inner lid 17,
The inner lid 14 is in close contact with the inner peripheral surface of the inner lid insertion portion 28 to prevent earth and sand, rainwater, and the like from entering the inner pipe 14 and the outer pipe 12.

The upper cover 18 is made of steel, stainless steel, or vinyl chloride and has a cylindrical shape with a bottom, and a cylindrical portion 41 is provided at the center thereof. In the center of this cylindrical portion 41, a circular screw hole 4 penetrating the upper and lower parts of the upper lid 18
2, and a female screw is threaded on the inner peripheral surface of the screw hole 42. Around the cylindrical portion 41, reinforcing ribs 43 are radially extended.
Can be maintained at a high strength.

A cylindrical pressing screw 44 having an engaging portion for engaging with the tip of a hexagon wrench is screwed at a position below the inner peripheral portion of the cylindrical portion 41. Further, a closing screw 45 having an engaging portion that engages with the tip of a Phillips screwdriver is screwed into the upper portion of the inner peripheral portion of the cylindrical portion 41, and earth and sand, rainwater, and the like enter the inner peripheral portion of the cylindrical portion 41. It is designed to prevent you from doing so. Further, an annular upper lid packing 46 made of rubber or silicone resin is attached to the outer peripheral surface of the central portion of the upper lid 18, and adheres to the inner peripheral surface of the upper lid insertion portion 29 so that earth and sand, rainwater, etc. It is designed to prevent entry into the tube 14 or the outer tube 12.

The operation of the leak detecting tube 11 will be described below. The leak detection pipe 11 is used by being buried at a position near the underground tank (not shown) so that the top cover 18 is exposed to the surface of the ground. Also, the leak detection tube 11
When the entire length is adjusted and used, first, the fixed state between the fixing band 15 and the length adjusting tube 13 is released, and then the length is adjusted as shown in FIG. Pull tube 13 up the desired length. Subsequently, the entire length of the leak detecting tube 11 is adjusted by tightening and fixing the length adjusting tube 13 with the fixing band 15 at that position.

When a liquid such as oil contained in an underground tank leaks into the surrounding soil, the liquid:
First, after passing through the outer tube liquid inflow hole 22 and entering the outer tube 12, a part thereof passes through the inner tube liquid inflow hole 24 and is stored in the inner tube 14. On the other hand, sand, mud, groundwater and the like contained in the soil around the leak detection tube 11 also enter the leak detection tube 11 like the liquid in the underground tank. The sand, mud, and the like gradually accumulate inside the inner pipe 14 to form deposits.

When periodically inspecting the inside of the leak detecting tube 11, first, as shown in FIG. 2A, the closing screw 45 is unscrewed and removed, and then, as shown in FIG. As shown, the pressing screw 44 is screwed using the hexagon wrench 51, and the lower surface of the pressing screw 44 presses the upper surface of the projection 31. At this time, since the position of the peripheral flange 32 of the inner lid 17 is fixed by being engaged with the flange receiver 28a, the upper lid 18 is moved upward and can be easily removed. Then, as shown in FIG. 2 (a), after the upper lid 18 is removed from the inside of the detection tube head 16 while gripping the cylindrical portion 41 or the reinforcing rib 43, the inner lid 17 is gripped while the convex portion 31 is gripped. Remove from inside of detector tube head 16. Subsequently, after the tip of the detection rod (not shown) is inserted through the extraction hole 25 to reach the lower end of the inner tube 14, the detection rod is moved to the inner tube 14.
It is extracted from the inside and it is determined whether or not the liquid in the underground tank is attached.

On the other hand, when cleaning the inside of the leak detecting tube 11, first, the upper cover 18 and the inner cover 17 are removed in the same manner as when inspecting the inside of the leak detecting tube 11. Next, only the inner tube 14 is extracted from the leak detection tube 11 using the extraction tool 52 shown in FIGS. 3 (c) and 3 (d). The extraction tool 52 is formed in a substantially bar shape by using steel, and a grip portion 53 is formed in a triangular frame shape at a base end thereof. Further, at the distal end of the extracting tool 52, a hook portion 54 having a substantially rectangular bottom surface is provided, which is inserted into the outlet hole 25 at the upper end of the inner tube 14, and the hook portion 54 is inserted into the outlet hole 25. After the insertion, the removal tool 52 is rotated by about 90 ° and pulled upward, so that the inner pipe 1 is removed.
Only 4 can be extracted from the leak detection tube 11.

At this time, as shown in FIG.
When sediment or the like accumulates between the inner pipe 14 and the outer pipe 12, the sediment is deposited on the inner pipe bottom 23 and the annular projection 21.
Is discharged from the lower end of the outer tube 12 into the surrounding soil through the bottom engagement hole 21a, which has been released from the fitting closed state.
Further, the water is discharged into the surrounding soil through the lower discharge hole 20 at the lower end of the outer pipe 12.

Next, the inner pipe 14 extracted from the leak detecting pipe 11 is vibrated or washed with running water in a state where the inner pipe 14 is turned upside down, so that the sand accumulated in the inner pipe 14 is removed. Deposits such as dust and mud can be removed, and the inside of the inner pipe 14 can be easily cleaned. Furthermore, when cleaning the inside of the outer tube 12, the inner tube 14 is pulled out, and running water is flowed from the detection tube head 16 into the outer tube 12 using a hose or the like, so that the inner periphery of the outer tube 12 is removed. The soil and the like adhered to the surface are discharged into the surrounding soil through the bottom engagement hole 21a and the lower discharge hole 20, and the inside of the outer pipe 12 is cleaned.

Finally, after inserting the cleaned inner pipe 14 into the leak detecting pipe 11, the upper end of the leak detecting pipe 11 is closed by the inner lid 17 and the upper lid 18. The effects exerted by the above embodiment will be described below.

The leak detecting tube 11 is composed of an outer tube 12 and
It has an inner cover 17 and an upper cover 18 for closing the upper opening of the outer tube 12, and also has an inner tube 14 removably inserted into the outer tube 12. For this reason, by pulling out the inner tube 14 from the inside of the outer tube 12, the inside of the inner tube 14 can be cleaned very easily and cleanly. Furthermore, by flowing water into the outer tube 12 with the inner tube 14 pulled out, the inside of the outer tube 12 can be cleaned very easily and neatly. Therefore, the leak detection function can be maintained at a high level for a long period of time.

Further, an outer tube liquid inflow hole 22 sized to selectively allow the liquid to pass therethrough is provided through the outer peripheral surface of the outer tube 12, and an inner tube liquid inflow hole 24 sized to selectively allow the liquid to pass therethrough. By penetrating the inner pipe 14 around the inner pipe 14, sand and mud are prevented from easily entering the inner pipe 14. Therefore, the number of times of cleaning the inside of the leak detection pipe 11 can be reduced. it can.

In the conventional leak detecting tube, a cylindrical cladding tube having a large number of small holes penetrating therethrough is fixed around a lower portion of the detecting tube main body provided with the small holes. There is also known a leak detection tube having a double structure in which a gap between the detection tube main body and the cladding tube is minimized. Since the leak detection tube is provided with a cladding tube on the outer peripheral portion of the detection tube main body, it has a structure that significantly inhibits the entry of solid deposits and does not significantly inhibit the entry of liquid. It is extremely difficult for sediment such as sand and mud to enter the detection tube main body. However, this double structure leak detector tube also
Since there is no special configuration for cleaning the inside of the detection tube main body, the inside of the tube cannot be easily cleaned.

A length adjusting tube 13 is provided above the outer tube 12 so that the entire length of the leak detecting tube 11 can be adjusted, so that the leak detecting tube 11 can be easily adjusted to a desired length. be able to. For this reason, leak detection can be performed on underground tanks of various sizes, and the versatility is high.

The provision of the inner lid 17 and the upper lid 18 makes it possible to more effectively prevent earth and sand, rainwater, and the like from entering the inner pipe 14. Further, a pressing screw 44 is screwed to a lower end portion of the upper lid 18 so that the convex portion 31 of the inner lid 17 can be pressed to move the upper lid 18 upward. , The upper lid 18 can be easily removed with a small force. In particular, when sand or mud enters between the outer peripheral surface of the upper cover 18 and the inner peripheral surface of the upper cover insertion portion 29, the upper cover 18
Although a very large force is required to remove the upper cover 18, this configuration makes it possible to amplify the rotational force on the pressing screw 44 and use it for the upward movement of the upper cover 18.

By forming the inner diameter of the detection tube head 16 larger than the outer diameter of the inner tube 14, the detection tube head 16
Since the inner tube 14 can be easily inserted and removed through the inside of the tube, the inside of the leak detection tube 11 can be easily cleaned. Further, since no protrusion or the like for preventing insertion and removal of the inner tube 14 is provided inside the detection tube head 16, insertion and removal of the inner tube 14 can be performed easily and reliably. .

The present embodiment can be embodied with the following modifications. The length adjusting tube 13 is configured to be inserted and fixed to the upper outer peripheral surface of the outer tube 12. Even with such a configuration, the entire length of the leak detection tube 11 can be easily adjusted.

Head fixing hole 26 and head fixing screw 27
Is omitted and the length adjustment tube 13 and the detection tube head 16 are integrally formed. With this configuration, the configuration of the leak detection tube 11 can be simplified.

The upper lid 18 is closed only by the upper lid 18 by omitting the inner lid 17. Further, the pressing screw 44 may be omitted. With this configuration, the configuration of the leak detection tube 11 can be simplified.

The outer tube 12 and the detecting tube head 16 are integrally formed by omitting the length adjusting tube 13 and the fixing band 15. With this configuration, the configuration of the leak detection tube 11 can be simplified.

The outer tube liquid inflow hole 22 provided in the outer tube 12 and the inner tube liquid inflow hole 24 provided in the inner tube are provided at different positions. In such a configuration, the inner pipe 1
Since the intrusion of sediment such as earth and sand into the inside of the tube 4 can be effectively suppressed, the number of times of cleaning the inside of the leak detection tube 11 can be easily reduced.

Omission of the lower discharge hole 20; -The annular projection 21 is omitted, and a disk-shaped bottom is provided at the lower end of the outer tube 12 so that the lower end of the inner tube 14 does not fall off.

The inner tube bottom 23 is formed in an inverted triangular pyramid shape, an inverted quadrangular pyramid shape, an inverted hexagonal pyramid shape, or another inverted cone shape (pointed shape), and the bottom engagement hole 21a is formed in the inner tube bottom portion. 2
3 should be penetrated in a shape (for example, triangular, quadrangular, hexagonal, etc.) into which it is fitted. With this configuration,
The inner tube 14 can be easily inserted into the outer tube 12, and the inner tube 14 can be easily positioned. Further, in the leak detection pipe 11 buried in the direct buried underground tank, the inside of the outer pipe 12 can be easily cleaned.

The leak detection tube 11 is used by being buried in dry sand around a tank room type underground tank. With such a configuration, the inner tube 14 can be pulled out and the inside of the tube can be easily cleaned.

Further, the technical ideas that can be grasped from the above embodiment will be described below. (1) The leak detecting tube according to any one of claims 1 to 3, wherein a lower end portion of the inner tube is formed in an inverted weight shape. With this configuration, the inner tube can be easily inserted into the outer tube.

(2) The leak detecting device according to (1), wherein a bottom engagement hole is formed in a lower end portion of the outer tube to engage with a lower end portion of the inner tube to position the inner tube. tube. With such a configuration, the positioning of the inner tube can be easily performed.

(3) The leak detecting tube according to (2), wherein the lower end of the inner tube is fitted into the bottom engagement hole to close the lower end of the outer tube. In the case of such a configuration, in the leak detection pipe buried in the direct buried underground tank, the inside of the outer pipe can be easily cleaned.

(4) In any one of (1) to (3) and (1) to (3), a lower discharge hole having a diameter larger than that of the liquid inflow hole is formed through the lower end of the outer tube. The leak detection tube as described. With this configuration, it is possible to effectively prevent surrounding earth and sand and groundwater from accumulating in the pipe.

[0045]

As described above in detail, according to the present invention, the following effects can be obtained. According to the leak detecting pipe of the first aspect, the inside of the pipe can be easily cleaned.

According to the second aspect of the present invention, in addition to the effects of the first aspect, the length of the leak detecting tube can be easily adjusted to a desired length. According to the third aspect of the present invention, in addition to the effects of the first or second aspect, it is possible to more effectively prevent rainwater from entering the pipe. , The top lid can be easily removed.

According to the leak detecting tube head of the invention, since the inner tube can be inserted and removed, the inside of the tube can be easily cleaned.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a leak detection tube according to an embodiment, and FIG.

FIG. 2A is an exploded cross-sectional view showing a leak detection tube according to the embodiment, and FIG.

FIG. 3A is a plan view showing an inner tube of the embodiment,
(B) is sectional drawing which shows the effect | action at the time of removing the upper lid of the leak detection tube of embodiment, (c) is a front view which shows the extraction tool of embodiment, (d) is the same side view.

[Explanation of symbols]

11 leak detection tube, 12 outer tube, 13 length adjustment tube, 1
4 ... Inner tube, 16 ... Detection tube head, 17 ... Middle lid, 18 ... Upper lid, 22 ... Outer tube liquid inflow hole as liquid inflow hole, 24 ...
Inner tube liquid inflow hole as liquid inflow hole, 31... Convex portion forming upper end of inner lid, 42... Screw hole, 44.

Claims (4)

[Claims] 1. A leak detection tube disposed around an underground tank for detecting leakage of a liquid in the underground tank, wherein the outer tube and the inner tube have a plurality of liquid inflow holes penetrating therethrough. A leak detecting tube, comprising: a lid for closing an upper opening of the outer tube; and an inner tube removably inserted into the outer tube. 2. The leak detecting tube according to claim 1, wherein a length adjusting tube is provided on the outer tube so that the length of the outer tube can be adjusted. 3. The lid body comprises an upper lid and a middle lid, and a screw hole is provided in the upper lid, and the upper hole of the middle lid is pressed into the screw hole to move the upper lid upward. The leak detecting tube according to claim 1 or 2, wherein the pressing screw is screwed. 4. A leak detecting tube head constituting an upper opening of an outer tube according to any one of claims 1 to 3, having an inner diameter larger than an outer diameter of the inner tube, A leak detecting tube head characterized in that the inner tube can be inserted and removed.