JP2018187771A - Pressurized inspection jig and pressurized inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressurized inspection jig and a pressurized inspection method capable of easily and safely performing a pressurized inspection of a water-barrier sheet joint part.SOLUTION: In a pressurized inspection method of this invention, a joining state of a sheet overlapped part 3 is inspected, the sheet overlapped part being formed cylindrically by fastening an edge of one water-barrier sheet 1 to a surface of another water-barrier sheet 1 in a state in which both edges of the two water-barrier sheets 1, 1 are overlapped with one another. The method includes steps of inserting an air supplying part 4 into the sheet overlapped part 3; sealing the sheet overlapped part 3 by clamping the two sheets 1, 1 and the air supplying part 4 at an edge part of the sheet overlapped part 3 by a chuck part 5; and then forcing a fluid having a predetermined pressure into the sheet overlapped part 3 from the air supplying part 4 and measuring pressure inside the sheet overlapped part 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure inspection jig and a pressure inspection method for a water shielding sheet joint.

  In the waste disposal site, the surrounding area is covered with a water-impervious layer so that pollutants do not flow out of the dumped waste. The water shielding layer covers a side surface and a bottom surface of the waste disposal site by joining a plurality of water shielding sheets. As a method for joining the water-impervious sheets, a so-called double seam is performed by welding the edges of one water-impervious sheet to the surface of the other water-impervious sheet in a state where the ends of the water-impervious sheets are overlapped with each other. The structure is known. In a joint portion having a double seam structure, a band-shaped overlapping portion (tubular portion) in which both ends are sealed is formed.

When constructing the water-impervious layer, it is confirmed that the water-impervious sheets are securely joined together by inspecting the joined state.
As a method for inspecting a joint portion of a water shielding sheet, for example, a pressure inspection method in which air is pressed into a joint portion (cylindrical portion) and an internal pressurization state is measured may be employed. In the pressure inspection method, in a state where both ends of the joined portion (cylindrical portion) are shielded with vise, air is injected from an air supply needle pierced into the joined portion, and for a certain time (for example, 30 seconds), It is confirmed that the internal pressure is kept constant (for example, 80% or more of the initial value).
Patent Document 1 discloses an inspection method in which smoke is sent from a needle that has pierced the joint, and then a location where the smoke flows out from the joint is confirmed.

Japanese Patent Laid-Open No. 05-069490

In the conventional inspection method, when the needle is pierced into the joint portion, it is necessary to perform so that the needle does not penetrate the overlapped portion of the water shielding sheet (two water shielding sheets). Since it has a predetermined hardness and thickness, it is difficult to adjust when the needle is inserted. Also, a sharp-pointed needle must be handled with care.
From such a viewpoint, an object of the present invention is to propose a pressure inspection jig and a pressure inspection method capable of simply and safely performing a pressure inspection of a water shielding sheet joint.

  The pressure inspection jig of the present invention for solving the above-mentioned problem is to fix the edge of one water-impervious sheet to the surface of the other water-impervious sheet in a state where the ends of the two water-impervious sheets overlap each other. By doing so, it is used when inspecting the joining state of the sheet overlapping portion formed in a cylindrical shape. The pressure inspection jig includes an air feeding portion inserted into one end of the sheet overlapping portion, and a chuck that shields the sheet overlapping portion by sandwiching the two water shielding sheets at one end of the sheet overlapping portion. The chuck portion is formed with a recess that can be fitted to the air supply portion. In addition, it is desirable that the recess is formed in the same shape as the outer shape of the air supply unit.

  Further, the pressure inspection method of the present invention is formed into a cylindrical shape by fixing the edge of one water-impervious sheet to the surface of the other water-impervious sheet in a state where the ends of the two water-impervious sheets are overlapped with each other. The joining state of the formed sheet superposition part is confirmed. In this pressure inspection method, an air supply portion is inserted into an end portion of the sheet overlapping portion, and the two water shielding sheets and the air supply portion are sandwiched between chuck portions at the end portion of the sheet overlapping portion. Then, after sealing the end of the sheet superimposing unit, a fluid having a predetermined pressure is pressed into the sheet superimposing unit from the air supply unit, and the pressure in the sheet superimposing unit is measured.

  According to the pressure inspection jig and the pressure inspection method, since it is not necessary to use a needle with a sharp tip, it is easy to handle. In addition, since the air supply unit and the chuck unit can be easily installed in the sheet superposition unit, the workability is excellent. Since the end portion of the sheet overlapping portion is shielded using the chuck portion, it is not necessary to separately prepare a jig for shielding the end portion of the vice or the like. Moreover, since it is not necessary to pierce the water-impervious sheet, the workability is excellent.

  According to the pressure inspection jig and the pressure inspection method of the present invention, it is possible to easily and safely perform the pressure inspection of the water shielding sheet joint.

It is a figure which shows the pressurization test | inspection condition which concerns on this embodiment. It is a top view which shows the air supply part of a pressurization inspection jig. (A) is a front view which shows the chuck | zipper part of a pressurization test jig | tool, (b) is a perspective view which shows the clamping member 51. FIG. FIG. 6 is an enlarged perspective view showing an installation state of the pressure inspection jig 2.

In this embodiment, when forming the water-impervious layer of the waste disposal site by joining a plurality of water-impervious sheets 1, as shown in FIG. ) And a pressure inspection method using the pressure inspection jig 2 will be described.
In this embodiment, the water-impervious sheet 1 is obtained by fixing the edge of one water-impervious sheet 1 to the surface of the other water-impervious sheet 1 in a state where the ends of the two water-impervious sheets 1 and 1 are overlapped. A so-called double seam structure that joins each other is adopted. The pressurization inspection is for confirming the joining state of the sheet overlapping portion 3 formed in a cylindrical shape by a double seam structure.

The pressure inspection is performed by using a pressure inspection jig 2 installed at one end of the sheet superposition unit 3.
The pressure inspection jig 2 includes an air supply unit 4 and a chuck unit 5.
The air supply unit 4 is a hollow member capable of compressing compressed air. As shown in FIG. 2, the air supply part 4 includes a distal end side insertion part 41, a connection part 42 formed at the base end part, and a fitting part formed between the insertion part 41 and the connection part 42. 43.

The insertion portion 41 is a portion that is inserted into the sheet overlapping portion 3. The insertion portion 41 of the present embodiment is a so-called blunt needle that is a needle-like member with a sharp tip. The insertion portion 41 is not limited as long as it is a member that can be inserted into the sheet overlapping portion 3 and through which compressed air can be inserted. For example, the insertion portion 41 may be a so-called sharp needle with a sharp tip.
The connection portion 42 is a connector for connecting the air supply pipe 7 for compressed air, and is formed at the base end portion of the air supply portion 4. In addition, the structure of the connection part 42 is not limited, For example, a screw type connector may be sufficient and a one-touch type connector may be sufficient.
The fitting portion 43 is a polygonal section (in the present embodiment, a cross-section rhombus shape) portion formed in the central portion in the axial direction of the air supply section 4. The fitting portion 43 of the present embodiment has a length equal to or greater than the thickness of the chuck portion 5 (the length in the direction orthogonal to the paper surface in FIG. 3A). In addition, the cross-sectional shape of the fitting part 43 is not limited, For example, a pentagon and a hexagon may be sufficient. Moreover, the formation location of the fitting part 43 does not necessarily need to be an axial direction center part, for example, may be formed adjacent to the front end side of the connection part 42. FIG. Moreover, the length of the fitting part 43 is not limited.

The chuck portion 5 shields one end of the sheet overlapping portion 3 by sandwiching the water shielding sheets 1 and 1 at one end of the sheet overlapping portion 3. As shown in FIG. 3A, the chuck portion 5 of the present embodiment includes a pair of clamping members 51, 51 and fastening bolts 52, 52 that pass through the pair of clamping members 51, 51.
The sandwiching member 51 is configured by a metal member having a width larger than the width of the sheet overlapping portion 3 (the interval between the edge of one water-impervious sheet 1 and the edge of the other water-impervious sheet 1). A gripping portion 53 that protrudes toward the other sandwiching member 51 is formed at the center of the sandwiching member 51, and fixed portions 54 are formed at both ends of the sandwiching member 51.

The grip portion 53 has a width larger than the width of the sheet overlapping portion 3, and a concave portion 55 is formed at the center of the grip portion 53. The height dimension of the grip part 53 is formed so as to increase toward the recess 55. The recess 55 is formed in the same shape as the cross-sectional shape of the upper half part of the fitting part 43 or the lower half part of the fitting part 43 (isosceles triangle in this embodiment). That is, when the concave portions 55 of the pair of sandwiching members 51 and 51 are opposed to each other, a space having the same shape (diamond shape) as the cross-sectional shape of the fitting portion 22 is formed. Further, when the concave portions 55 of the pair of sandwiching members 51 and 51 are opposed to each other, gaps are formed on both sides of the concave portion 55 such that the interval increases from the concave portion 55 toward the end of the grip portion 53.
As shown in FIG. 3B, the fixing portion 54 is formed with a through hole 56 through which the tightening bolt 52 is inserted.
The clamping bolt 52 is inserted through the through holes 56 of the pair of clamping members 51 and 51. As shown in FIG. 3A, a nut 57 is screwed onto the distal end side of the tightening bolt 52 to apply a tightening force to the pair of clamping members 51 and 51.

In the pressure inspection method of the present embodiment, first, the pressure inspection jig 2 is installed at one end of the sheet superposition unit 3. As shown in FIG. 4, the pressure inspection jig 2 inserts the air supply unit 4 at one end of the sheet superposition unit 3 and seals one end of the sheet superposition unit 3 with the chuck unit 5.
The air supply unit 4 is inserted between the water shielding sheets 1. At this time, the air supply part 4 is inserted until the fitting part 43 is sandwiched between the two water-impervious sheets 1, 1. In addition, with the clamping members 51 disposed above and below the sheet overlapping portion 3, the end portions of the sheet overlapping portion 3 are screwed by screwing nuts 57 to the fastening bolts 52 inserted through the both sandwiching members 51, 51. Hold it. At this time, by fitting the fitting portion 43 and the recess 55, the air feeding portion 4 is also held together with the water shielding sheets 1 and 1. The water shielding sheets 1, 1 are brought into close contact with the outer surface of the fitting portion 43 by pressing the end portions of the water shielding sheets 1, 1 interposed between the gripping portions 53, 53 with the gripping portions 53, 53.

  In the present embodiment, a pair of grooves 11 and 11 are formed on both sides of the sheet overlapping part 3 by cutting out a part of the water shielding sheet 1 on one end side of the sheet overlapping part 3. When the pressure inspection jig 2 is installed at one end of the sheet overlapping portion 3, the fastening bolt 52 is inserted through the groove 11, so that the sheet overlapping portion 3 can be shielded by the chuck portion 5. In the present embodiment, the triangular groove 11 is formed, but the shape of the groove 11 is not limited. Moreover, what is necessary is just to form the groove | channel 11 as needed. Further, instead of the groove 11, a through hole into which the fastening bolt 52 can be inserted may be formed in the water shielding sheet 1.

  Next, as shown in FIG. 1, the other end of the sheet overlapping portion 3 is shielded by the vice 6. The vise 6 of this embodiment has a pair of clamping parts 61 (only one clamping part 61 is displayed in the drawing) and a grip part 62. The sandwiching portion 61 has a width larger than the width of the sheet overlapping portion 3 (the interval between the edge of one water shielding sheet 1 and the edge of the other water shielding sheet 1). The vice 6 shields the other end of the sheet overlapping portion 3 by tightening with the grip portion 62 in a state where the clamping portions 61 are respectively disposed above and below the sheet overlapping portion 3. The configuration of the vice 6 is not limited. Moreover, the shielding method of the other end of the sheet | seat superposition | polymerization part 3 is not limited. In addition, the timing which shields the other end of the sheet | seat superposition | polymerization part 3 is not limited, For example, you may carry out before installing the pressure test | inspection jig | tool 2 in the end of the sheet | seat superposition | polymerization part 3.

When both ends of the sheet superposition unit 3 are shielded by the pressure inspection jig 2 and the vice 6, compressed air having a predetermined pressure is injected into the sheet superposition unit 3 from the air feeding unit 4, and the pressure in the sheet superposition unit 3 is reduced. measure. The compressed air is pumped from an air pump (not shown) through an air supply pipe 7 connected to the connection part 42 of the air supply part 4. In this embodiment, after the compressed air is pressed into the sheet superposition unit 3 so that the inside of the sheet superposition unit 3 has a predetermined pressure (0.1 MPa in this embodiment), the inside of the sheet superposition unit 3 for 30 seconds. Measure the change in pressure.
In this embodiment, if the pressure for 30 seconds in the sheet superposition part 3 is maintained at 80% (0.08 MPa), it is recognized that the sheet superposition part 3 is well bonded. After confirming the joining of the sheet overlapping part 3, the pressure test is terminated, and the pressure test jig 2 and the vice 6 are removed.

  According to the pressurization inspection jig 2 and the pressurization inspection method of the present embodiment, since the pressurization inspection jig 2 (the air supply unit 4) can be easily installed on the sheet superimposing unit 3, the workability is excellent. . That is, by omitting the trouble of penetrating the needle through the water-impervious sheet 1, the labor of the work can be greatly reduced. Moreover, since it is not necessary to use the needle with the pointed tip as the air supply part 4, it is easy to handle. Further, since one end of the sheet overlapping portion 3 is shielded using the chuck portion 5, it is not necessary to separately prepare a jig for shielding an end portion such as a vice in addition to the pressure inspection jig 2. For this reason, it is possible to reduce the labor of the work.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the above-described components can be appropriately changed without departing from the spirit of the present invention.
In the embodiment, the case where the fitting part 43 having a polygonal cross-sectional view is formed in a part of the air supply part 4 has been described. However, the fitting part 43 may be formed as necessary. Moreover, the fitting part 43 does not necessarily need to be polygonal shape, for example, a cross-sectional ellipse shape may be sufficient and the shape in which the several unevenness | corrugation was formed may be sufficient.
The clamping member 51 of the chuck portion 5 may be provided with a cushioning material such as a rubber sheet on the contact surface with the water shielding sheet 1. The material constituting the holding member 51 is not limited to the metal member as long as it has a strength capable of shielding the end of the sheet overlapping portion 3.
The compressed air supply means is not limited to an air pump, and may be, for example, a compressor. Moreover, in the said embodiment, although compressed air was press-fit in the sheet | seat superposition | polymerization part 3, the fluid used for a pressurization test is not limited to compressed air. For example, it may be a liquid such as water, or may be smoke or the like.
The pressure in the sheet overlapping portion 3 that becomes a management standard in the pressure test is not limited, and may be determined as appropriate.
The use of the water shielding sheet 1 is not limited to the water shielding layer.

DESCRIPTION OF SYMBOLS 1 Water-impervious sheet 2 Pressurization inspection jig 3 Sheet superposition part 4 Air supply part 41 Insertion part 42 Connection part 43 Fitting part 5 Chuck part 51 Clamping member 52 Tightening bolt 53 Holding part 54 Fixing part 55 Recessed part 56 Through-hole 57 Nut 6 Vice 7 Air pipe

Claims (3)

Inspecting the joining state of the sheet overlapping part formed in a cylindrical shape by sticking the edge of one water-impervious sheet to the surface of the other water-impervious sheet with the ends of the two water-impervious sheets overlapped It is a pressure inspection jig used when
An air supply part inserted into one end of the sheet overlapping part;
A chuck portion that shields the sheet overlapping portion by sandwiching the two water shielding sheets at one end of the sheet overlapping portion;
The pressure inspection jig, wherein the chuck portion is formed with a recess that can be fitted to the air supply portion.   The pressure inspection jig according to claim 1, wherein the recess has the same shape as the outer shape of the air supply unit. Confirming the joining state of the sheet overlapping part formed in a cylindrical shape by sticking the edge of one water-impervious sheet to the surface of the other water-impervious sheet with the ends of the two water-impervious sheets overlapped Pressurizing inspection method,
An air feeding part is inserted into an end part of the sheet superposition part, and the end of the sheet superposition part is sandwiched between the two water shielding sheets and the air feeding part by a chuck part at the end part of the sheet superposition part. After sealing the part,
A pressure inspection method, wherein a fluid having a predetermined pressure is press-fitted from the air supply section into the sheet superposition section to measure the pressure in the sheet superposition section.

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