JPH11142277A - Method for inspecting leak of sheet seal part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently surely inspect a leak of a seal area at low inspection cost by forming a space between a band-shaped coat member and a boundary part of sheet seal parts, using the space as a leak inspection hole, applying or reducing a pressure from the hole and detecting a change of a pressure value. SOLUTION: Leading end faces of sheets 1A, 1B are butted. A seal sheet 2 is overlapped on upper faces 12a, 12b of the sheets and heated, thereby fusing the sheets. A seal part 100 of a water-shielding structure is formed. Two band- shaped coat members 4 each having a release paper tape 5 bonded to a nearly central area in a breadthwise direction of a lower face 41 are registered and bonded so that the central area agrees with a boundary part 3 between the sheets 1A, 1B and the seal sheet 2. As a result, each boundary part 3 is coated with the coat member 4, and at the same time a slight space is left by the tape 5, whereby a leak inspection hole 6 in touch with the seal part 100 is formed. One end 60 of the hole 6 is closed. The hole is pressurized with a positive pressure or depressurized with a negative pressure from the other end 61. A change of a pressure value is detected, and the presence/absence of a leak is confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting leakage of a sheet joint.

[0002]

2. Description of the Related Art Generally, for example, agricultural ponds, golf courses,
Water-impervious sheets laid to prevent water leakage at park landscape ponds, managed waste landfills, etc.
The ends of the sheets are opposed to each other and are overlapped in a belt shape and welded to form a joint of the water-blocking structure.

Here, for example, as a method for inspecting the joint for leaks, soap water or the like is applied to one of both ends of the band-shaped outer periphery of the joint, and the other of the two ends of the band-shaped outer periphery is formed of a wall member container capable of forming a sealed space. It is known to visually observe whether or not the soapy water foams by covering and reducing the pressure in the sealed space.

[0004]

However, in the case of the above-described conventional method for inspecting the leakage of the joint, the required number of inspection steps and the inspection time are proportional to the length of the leakage inspection object. In addition, it is disadvantageous in terms of inspection cost.
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a sheet joint leakage inspection method that can efficiently and reliably perform a leakage inspection of all joint regions and is advantageous in terms of inspection cost. .

[0005]

According to a first aspect of the present invention, there is provided a method of inspecting a sheet joint for leaking sheets, wherein the two sheets are joined by overlapping and welding each end of the two sheets in a belt shape. Leak inspection method, wherein the sheet bonding portion is adhered to each end along the longitudinal direction superposed in a band shape, leaving a space at a boundary portion along the longitudinal direction between the respective ends. Has a long hole for leakage inspection formed between the boundary portion and the band-shaped covering member by the band-shaped covering member covering in a closed state, and one end of the hole is closed from the other end of the hole. It is characterized in that the presence or absence of leakage is confirmed by applying or reducing pressure and detecting a change in the applied pressure value or a change in the reduced pressure value.

According to a second aspect of the present invention, there is provided a method for inspecting leakage of a sheet joint according to the first aspect, wherein the elongated member for inspecting leakage is provided between the band-shaped covering member and a boundary portion between the ends. Are formed. Claim 3
In the invention of the first aspect, the band-shaped covering member has a protruding shape extending in the longitudinal direction on a back surface facing a boundary portion between the end portions.

According to a fourth aspect of the present invention, there is provided a method for inspecting leakage of a sheet joint according to the first aspect, wherein the band-shaped covering member has a concave groove extending in the longitudinal direction on a back surface opposed to a boundary portion between the ends. Have. According to a fifth aspect of the present invention, in the method for inspecting leakage of a sheet joint portion according to the first aspect, one of the end portions has a protruding shape extending in the longitudinal direction on a facing surface facing a back side of the band-shaped covering member. With.

According to a sixth aspect of the present invention, in the first aspect of the invention, there is provided a method for inspecting a sheet joint portion, wherein one of the ends is provided on an opposing surface opposing a back side of the band-shaped covering member in the longitudinal direction. 2. The method according to claim 1, further comprising a concave groove extending. The invention according to claim 7, wherein the method for inspecting leakage of a sheet joint is a method for inspecting leakage of a sheet joint joined by overlapping and welding each end of two sheets in a belt shape, At the time of the welding, the sheet bonding portion is welded via a heat-resistant and air-permeable tubular body disposed along a longitudinal region overlapped in a band shape at each end, and after welding, the tubular shape is formed. With the one end opening of the body closed, pressure is applied or reduced from the other end opening of the cylindrical body, and a change in the pressure value applied through the cylindrical body or a change in the reduced pressure value is obtained. It is characterized in that the presence or absence of leakage is confirmed by detection.

[0009]

DETAILED DESCRIPTION OF THE INVENTION In the method for inspecting leakage of a sheet joint according to the present invention, the two sheets to be joined have strength enough to be used as a material thereof, have little change over time, and have a small change over time. What is excellent in familiarity, workability, weather resistance, water pressure resistance, pressure resistance, etc. is used.

Examples of the material that can be used as the two sheets include an asphalt sheet having a predetermined thickness (a thick nonwoven fabric made of long polypropylene fiber is used as a mat-shaped core material, Of which all layers are impregnated with asphalt and an elastomeric polymer compound) and, in this case, the water-impervious sheet in general, polyethylene, synthetic rubber, vinyl chloride,
Ethylene / vinyl acetate copolymer, thermoplastic elastomer, etc., and the following, which are different in composition from homogeneous asphalt-based sheets, namely, laminated asphalt sheets [thin nonwoven fabric (made of long polypropylene fiber, etc.)
Sheet that has been impregnated with asphalt and further coated with asphalt on both sides to have a predetermined thickness)
Etc. can be used. The thickness of the two sheets to be joined is 1 mm to 10 mm.

The band-shaped covering member according to any one of claims 1 to 6 is a state in which a space is left at a boundary portion along the longitudinal direction superposed in a band shape at each end of the sheet joining portion of the two sheets. It is bonded and used to form a leak inspection hole along the longitudinal direction between the strip-shaped covering member and the boundary portion. The boundary portion is formed with a step corresponding to the thickness of one sheet of the two joined sheets. Therefore, when the boundary portion is covered with the belt-shaped covering member, a tensile force (tension) is applied in the width direction thereof. By adhering in the longitudinal direction, it is possible to cover while leaving a space, and a long hole for leakage inspection can be formed between the boundary portion and the band-shaped covering member. The hole for leakage inspection is a through hole, and the hole diameter is 1 mm to 5 mm.

The reason why the hole for leak inspection is a through hole is that, before the leak inspection of the joint, a hole space is formed in the entire region from one open end side to the other open end side of the leak inspection hole. This is because, by being formed, the presence or absence of all leaks in the longitudinal region of the joint can be inspected. Therefore, prior to the leakage inspection, it is confirmed in advance that the leakage inspection hole formed along the longitudinal region inside the joint portion penetrates from one opening end side to the other opening end side. Need to be kept.

The band-shaped covering member may be made of a material having an adhesive function itself or a material having no adhesive function, and may have a predetermined width on both sides along the longitudinal direction. A tape provided with an adhesive tape or coated with an adhesive is used. In short, as the band-shaped covering member, the two sheets are covered in a state where a space is left at a boundary portion along the longitudinal direction between the ends after joining of the joining portion of the two sheets,
In addition, a long hole for leak inspection can be formed, and when pressure is applied or reduced to the hole, airtightness of both sides along the longitudinal direction is maintained, and it does not matter if leak inspection is not hindered. .

As the belt-shaped covering member, a long band-shaped body (for example, the asphalt sheet which is relatively thin (1
mm to 4 mm thick), an opaque pressure-sensitive adhesive tape, a transparent pressure-sensitive adhesive tape, or a non-adhesive strip, and a double-sided tape or an adhesive (agent) is applied to both ends in the width direction along the longitudinal direction Provided that they can form a long hole for leakage inspection along the boundary when they are adhered to two sheets.

If the band-shaped covering member is made of a transparent material, it can be visually confirmed from the outside whether or not a long hole for leakage inspection is formed. Further, it is preferable that a spacer for forming a long hole for leakage inspection is previously attached and adhered to an opposing surface of the band-shaped covering member opposing the two joined sheets. That is, by setting the thickness, shape, material, and the like of the spacers variously, it is possible to positively form leak inspection holes having various desired cross-sectional shapes. When a spacer is used, when the boundary portion is covered with a band-shaped covering member,
Even without applying a pulling force (tension) in the width direction, a leak inspection hole can be reliably formed.

In the case where the opposing surface of the strip-shaped covering member itself has an adhesive or adhesive function, the spacer is a paper, a film, an aluminum foil, a string, a wire adhered to and adhered to the opposing surface. , A rod, a spiral, a knitted tube, or the like can be used. Further, when the opposing surface itself of the band-shaped covering member does not have an adhesive or adhesive function, it can be adhered to the opposing surface, an adhesive tape that can be adhered, or one surface adhered to the opposing surface, a double-sided tape adhered Paper, a film, an aluminum foil, a string, a wire, a rod, a spiral, a knitted tube, or the like that is adhered to or adhered to another surface can be used.

After bonding the opposing surface of the band-shaped covering member and the band-shaped covering member to two sheets so that the hole for leak inspection is formed in a penetrated state, a long string, a wire, a rod-shaped body, or the like is formed. By moving in the longitudinal direction, it is possible to confirm whether or not the long hole for leakage inspection has penetrated. In addition,
When the sheet joining portion joined by overlapping and welding the ends of the two sheets facing each other in a band shape and welding is covered with the band-shaped covering member, the spacers form the sheet joining portions. It is sufficient that a space is left at a boundary portion along the longitudinal direction and that it is arranged so that a hole for leakage inspection can be formed.For example, it is arranged in the entire region in the longitudinal direction, or spaced apart in the longitudinal direction. It can be arranged at a plurality of positions.

Further, the band-shaped covering member covering the boundary portion of the joined sheet joining portion has a protruding or concave groove extending in the longitudinal direction on the opposite back surface facing the boundary portion instead of using the spacer. By using this, a hole for leak inspection can be formed. In addition, instead of using the spacer, one of the ends of the two sheets has a protruding or concave groove extending in the longitudinal direction on an opposing surface opposing the back side of the band-shaped covering member. By using this, a hole for leak inspection can be formed.

A pressure (positive pressure) or a reduced pressure applied to the hole for leak inspection according to any one of claims 1 to 6 or the hole of the cylindrical body for leak inspection according to claim 7 at the time of leakage inspection of the joint. The reference pressure value (eg, negative pressure, suction pressure) is about 300 mmHg to about 600 mmHg in the case of positive pressure, and −
(Minus) about 300 mmHg to about 600 mmHg.

According to the first to sixth aspects of the present invention, when the pressure is applied or reduced directly to the joint from the leak inspection hole and the reference pressure value does not change after a predetermined time, If there is no leakage at the joint and the reference pressure value changes, it can be confirmed that there is leakage at the joint. According to the configuration of the seventh aspect, the pressure is applied or decompressed indirectly to the joint portion through the air-permeable peripheral wall of the tubular body for leakage inspection, and after a predetermined time elapses, the reference pressure value changes. If not, there is no leakage at the joint, and if the reference pressure value changes, it can be confirmed that there is leakage at the joint.

In a preferred embodiment of the present invention, the cylindrical body for leakage inspection has a cylindrical shape having a hole penetrating in the longitudinal direction, or a bottomed cylinder in which one of the openings at both ends of the hole penetrating in the longitudinal direction is closed in advance. Or one closed at one end of the cylindrical both ends by using a plug inserted into the hole, a lid attached to the outer peripheral surface side, welding of the sheet to be joined, or the like. be able to.

The heat-resistant material of the tubular body is 2
In the case where a sheet joining portion is formed by joining the ends of two sheets facing each other in a belt shape via a tubular body and joining them by welding, when a heating temperature required for the welding is applied. Even, refers to a material that does not lose the air permeability required for leak inspection, for example, non-combustible, such as glass fiber, rock fiber, metal wire, metal fiber, sintered alloy, carbon fiber, heat-resistant fiber, heat-resistant resin, Flame retardant substances can be used.

The air permeability of the tubular body can be such that air can be passed from the inner circumferential surface side of the tubular body to the outer peripheral surface side via the tubular wall, or the inner peripheral surface of the tubular member can be passed through the cylindrical wall through the cylindrical wall. Any material can be used as long as it can be ventilated to the surface side.
Each of the above fibers is superposed in layers, so-called laminated and formed into a cylindrical shape, sintered alloy, porous material and the like formed in a cylindrical shape, a metal wire formed into a spiral shape, metal It is possible to use a cylinder having a minute slit or a small hole formed in a cylinder wall, such as a cylinder made of a heat-resistant resin.

[0024]

(Embodiment 1) As a first embodiment, a method for inspecting leakage of a sheet joining portion according to claim 1 is to join two sheets made of a material including asphalt, which are used for shielding water in a wastewater treatment pond. Apply when joining using a sheet for
This will be described below with reference to FIGS.

In the method for inspecting the leakage of the sheet joint portion of the first embodiment, two sheets 1A and 1B for laying, one sheet 2 for joining, and two band-shaped covering members are prepared as preparations before implementation. 4 and 4 are prepared respectively. Then, as shown in FIG. 1, first, two sheets 1A and 1B are arranged at a place where the laying is intended. Two sheets 1A, 1B
Is made of asphalt, has a thickness t of 3 mm, a length L to be joined to the joining sheet 2 is 10 m, and a width W to be joined.
1 is 150 mm.

The sheets 1A and 1B are arranged in a state where the front end faces 10a and 10b facing each other abut against each other. The overlapping margin area where the joining target width W1 of the sheet 1A is to be joined is the end 11a. The overlap margin area where the width W1 to be welded of the sheet 1B is to be welded is the edge 1
1b. The joining sheet 2 is made of asphalt, has a thickness t1 of 3 mm, a joining target length L of 10 m,
The width W to be joined is 300 mm. The overlap margin areas of the joining sheet 2 where the joining target width W is to be joined are an end 2a facing the end 11a of the sheet 1A and an end 2b facing the end 11b of the sheet 1B.

The joining sheet 2 is provided on the lower surface 20 of the end 2a.
Are overlapped in a band shape facing the upper surface 12a of the end 11a of the sheet 1A, and the lower surface 20 of the end 2b is
They are superposed in a band shape facing the upper surface 12b of the end portion 11b of B (see FIGS. 1 and 4). Next, the lower surface 20 of the end 2b of the joining sheet 2 and the sheet 1
Upper surface 12a of end 11a of A, end 11b of sheet 1B
Both surfaces of the upper surface 12b are heated by a heating device such as a propane burner (not shown), another burner, a hot iron, a hot air blower or the like, and the upper surfaces 12a and 12b and the lower surface 20 are melted and welded while being superposed. Then, the junction 100 (see the waveform in FIG. 5) of the water-blocking structure is formed.

The joining portion 100 has a boundary portion 3 between the sheet 1A and the joining sheet 2 and the sheet 1B and the joining sheet 2 along both side ends 22 and 23 extending in the longitudinal direction P of the joining sheet 2. , 3 are formed. here,
Two band-shaped covering members 4 prepared in advance are used.
Each band-shaped covering member 4 is made of asphalt, has a thickness t2 of 2 mm, a length L2 of 10 m, and a width W2 of 100 m.
m. The band-shaped covering member 4 itself has a sticking and adhering function due to its material.

The lower surface of each band-shaped covering member 4 (sheet 1A, 1
On the side of the facing surface 41), a release paper made of release paper having a thickness t3 of 0.2 mm and a width W3 of 30 mm is provided in a substantially central region in the width W2 direction along the longitudinal direction of each band-shaped covering member 4. The tape 5 is adhered. Even if the tape 5 has a non-adhesive surface on the side of the adhesive surface 50 adhered to the lower surface 41 of each band-shaped covering member 4, the tape 5 can be adhered without any trouble because the band-shaped covering members 4 are made of an adhesive material. The exposed surface 51 of the sex faces the boundary portion 3.

When each of the strip-shaped covering members 4 is not made of an adhesive material, a tape having an adhesive property on the adhesive surface 50 side can be used. In short, tape 5
Any combination may be used as long as one surface can be bonded to the lower surface 41 of the band-shaped covering member 4 and the other surface facing the boundary portion 3 can be non-bonded. After this,
Each of the belt-shaped covering members 4, 4 aligns the central region of the lower surface 41 to which the tape 5 is adhered to the position facing the boundary portions 3, and the lower surfaces 41 of both end regions where the tape 5 is not adhered. The upper surface 12a of the sheet 1A and the upper surface 21 of the bonding sheet 2 and the upper surface 12b of the sheet 1B and the upper surface 21 of the bonding sheet 2 are bonded.

Then, each boundary portion 3 is connected to the strip-shaped covering member 4.
And the lower surface 41 of the band-shaped covering member 4 in advance.
Due to the presence of the tape 5 adhered to the side, some space remains, and a communication hole 6 for leakage inspection (FIGS. 3 and 6).
Ref.) Can be formed. Then, one end 60 (see FIG. 3) of the leak inspection hole 6 in contact with the joint 100 is closed, and a positive pressure of about 500 mmHg is applied from the open other end 61 (FIG. 3).
(See arrow Y1) or a negative pressure of about 500 mmHg (see arrow Y2 in FIG. 3), and the presence or absence of leakage is detected by detecting a change in the applied pressure value or a change in the reduced pressure value. You can check.

As described above, according to the method for inspecting the leakage of the sheet joint portion of the first embodiment, the work required to form the hole 6 for the leakage inspection includes the sheet joint portion 10 formed in advance.
0, the upper surface 21a of the sheet 1A and the upper surface 21 of the bonding sheet 2 and the upper surface 12b of the sheet 1B and the upper surface 21 of the bonding sheet 2 are bonded to the boundary portion 3 covered with the band-shaped coating member 4, respectively. The tape 5 bonded to the lower surface 41 of the band-shaped covering member 4 can be formed with a very simple operation of leaving a space, easily, and quickly.

Furthermore, the leak inspection of the sheet joint portion 100 can be efficiently performed by using the leak inspection holes 6, which is advantageous in terms of the inspection cost. In the first embodiment, the tape 5 is used as the spacer. However, instead of the tape 5, paper, sheet, film,
A string, a wire, a spiral body, a knitted tube, or the like can also be used, and the same effect as in the first embodiment can be obtained.

(Modification 1) As shown in FIG. 7, without using the tape 5 as the spacer shown in the first embodiment,
The upper surface 12a of the sheet 1A is applied to each of the asphalt band-shaped covering members 4 having a sticking and adhering function because of the material itself while applying a pulling action (tension) in the width direction W2.
And upper surface 21 of joining sheet 2 and upper surface 1 of sheet 1B
2b and the upper surface 21 of the joining sheet 2
By adhering 1 and 41 (see FIG. 8), a hole 6 for leakage inspection can be formed.

In the case of the first modification, the same effect as that of the first embodiment can be obtained. (Modification 2) Instead of each band-shaped covering member 4 shown in Modification 1, the thickness shown in FIG.
mm of each band-shaped covering member 4a made of a rubber plate.
After sticking the adhesive tapes 42 and 42 on the upper surfaces 40a at both ends of the sheet 2, the upper surface 12a of the sheet 1A, the upper surface 21 of the joining sheet 2 and the sheet 21 while applying a pulling action (tension) in the width direction W2. 1B and the upper surface 21 of the bonding sheet 2 respectively.
By bonding 2 (see FIG. 10), a hole 6 for leakage inspection can be formed.

The respective band-shaped covering members 4a include:
Instead of rubber plate, EVA (ethylene / vinyl acetate copolymer) plate, polyethylene plate, polyvinyl chloride plate,
It can be made of polyester film, nylon film or the like. Also in the case of the second modification, the same effect as that of the first embodiment can be obtained. (Modification 3) Instead of each band-shaped covering member 4 shown in Modification 1, the thickness shown in FIG.
After each of the band-shaped covering members 4b made of a rubber plate having a thickness of 0 mm, adhesive materials 43, 43 are adhered to the lower surface 41b opposite to the upper surface 40b at both ends in the width direction W2, and these are adhered to the upper surface 12a of the sheet 1A. Upper surface 21 of bonding sheet 2 and sheet 1B
The adhesive 6 is bonded to the upper surface 12b of the bonding sheet 2 and the upper surface 21 of the bonding sheet 2 (see FIG. 12), so that the hole 6 for leak inspection can be formed without imparting a pulling action (tension) in the width direction W2. Can be formed.

The respective band-shaped covering members 4a include:
Instead of rubber plate, EVA (ethylene / vinyl acetate copolymer) plate, polyethylene plate, polyvinyl chloride plate,
It can be made of polyester film, nylon film or the like. In the case of the third modification, the same effect as that of the first embodiment can be obtained. (Modification 4) Each band-shaped covering member 4 shown in Modification 1 is made of the same asphalt, and as shown in FIG.
A groove 45 extending in the longitudinal direction of the boundary portion 3 is provided in a central region facing the boundary portion 3 on the lower surface 41c opposite to the upper surface 40c.
, The upper surface 12 of the sheet 1A
a and the upper surface 21 of the bonding sheet 2 and the upper surface 12b of the sheet 1B and the upper surface 21 of the bonding sheet 2, respectively.
By adhering 1c and 41c (see FIG. 14), the leak inspection hole 6 can be formed without imparting a pulling action (tension) in the width direction W2.

In the case of the fourth modification, the same effect as that of the first embodiment can be obtained. (Modification 5) The belt-shaped covering members 4 shown in Modification 1 are made of the same asphalt, and as shown in FIG.
A ridge 4 extending along the longitudinal direction of the boundary portion 3 is provided in a central region facing the boundary portion 3 on the lower surface 41d opposite to the upper surface 40d.
6, the upper surface 1 of the sheet 1A is used.
The lower surfaces 41d and 41d are bonded to the upper surface 21a of the bonding sheet 2 and the upper surface 21 of the bonding sheet 2 and the upper surface 12b of the sheet 1B and the upper surface 21 of the bonding sheet 2 (see FIG. 14). The hole 6 for leakage inspection can be formed without providing the holes.

In the case of the fifth modification, the same effect as that of the first embodiment can be obtained. (Modification 6) In the case of Modification 6, as shown in FIG. 17, the upper surface 12a of the sheet 1A and the upper surface 1a of the sheet 1B
2b, grooves 1 along the longitudinal direction of the boundary portion 3 respectively
4 and the upper surface 12a of the sheet 1A and the bonding sheet 2
, The upper surface 21b of the sheet 1B and the upper surface 21 of the joining sheet 2, respectively.
This is the same as the modification 1 except that the holes 6 for leakage inspection are formed by bonding the first and the first 41 (see FIG. 18).

According to the sixth modification, the same effect as that of the first embodiment can be obtained, and the lower surface 4 of each band-shaped covering member 4 can be obtained.
When bonding the components 1 and 41, the leak inspection hole 6 can be formed without imparting a pulling action (tension) in the width direction W2. (Modification 7) In the case of Modification 7, as shown in FIG. 19, the upper surface 12a of the sheet 1A and the upper surface 12a of the sheet 1B
2b, ridges 15 are formed along the longitudinal direction of the boundary portion 3 respectively. The upper surface 12a of the sheet 1A and the upper surface 21 of the bonding sheet 2 and the upper surface 12b of the sheet 1B and the upper surface 21 of the bonding sheet 2 By bonding the lower surfaces 41, 41 of each band-shaped covering member 4 (see FIG. 20),
Modification 1 except that a hole 6 for leak inspection is formed.
Is the same as

According to the seventh modification, the same effect as that of the first embodiment can be obtained, and the lower surface 4 of each band-shaped covering member 4 can be obtained.
When bonding the components 1 and 41, the leak inspection hole 6 can be formed without imparting a pulling action (tension) in the width direction W2. (Embodiment 2) In the case where two sheets made of a material including asphalt are used for sealing a wastewater treatment pond, the method according to the first aspect of the present invention, which is a method for inspecting leakage of a sheet joint, is used as a second embodiment. And will be described below with reference to FIGS.

In the method for inspecting the leakage of the sheet joint portion of the second embodiment, two sheets 1C and 1D for laying and one band-shaped covering member 4 are prepared as preparations before the execution. The two sheets 1C and 1D are made of asphalt and have a thickness t of 4 mm and a length L to be joined of 10
m, the width W4 to be joined is 300 mm.

The overlap margin area where the width W4 to be welded of the sheet 1C is to be welded is the end 11c. Sheet 1D
The overlap margin area where the welding target width W4 is to be welded is
The end 11d. One band-shaped covering member 4 is the same as that of the first embodiment.
The same ones used in the above are used. First, sheet 1
C attaches the lower surface 14c of the end 11c to the end 1 of the sheet 1D.
They are superposed in a band shape facing the upper surface 12d of 1d (see FIGS. 21 and 24).

Next, the upper surface 12c of the sheet 1C is heated by a heating device such as a propane burner (not shown), another burner, a hot iron, a hot air blower or the like, and the upper surface 12d of the end 11d of the sheet 1D and the upper surface 12c of the sheet 1C are heated. Tip 11c
Is melted and welded to the lower surface 14c to form a joint portion 100 (see waveforms in FIGS. 22 and 25) of the water-blocking structure.

Thereafter, one band-shaped covering member 4 prepared in advance is used. The band-shaped covering member 4 is made of asphalt and has a thickness t2 of 2 mm and a length L2 of 10 mm.
m and width W2 are 100 mm. The band-shaped covering member 4 itself has a sticking and adhering function due to its material. Lower surface of belt-shaped covering member 4 (facing surface facing sheets 1C and 1D) 4
One side has a thickness t3 of 0.2 mm and a width W in a substantially central region in the width W2 direction along the longitudinal direction of the belt-shaped covering member 4.
A tape 5 having a length of 30 mm is bonded. The tape 5 has the adhesive surface 50 side adhered to the lower surface 41 of each band-shaped covering member 4,
The non-adhesive surface 51 side faces the boundary portion 3.

Thereafter, the band-shaped covering member 4 aligns the central area of the lower surface 41 to which the tape 5 is adhered with the position facing the boundary portion 3 and the both end areas where the tape 5 is not adhered to the sheet 1C. To the upper surface 10c of the bonding sheet 2C and the upper surface 20 of the bonding sheet 2C. Then, the boundary part 3
a, 3b, when covered with the respective band-shaped covering members 4,
Due to the presence of the tape 5 previously bonded to the lower surface 41 side of each band-shaped covering member 4, a small space remains and a long hole 6 for leakage inspection can be formed.

Then, one end 60 of the leak inspection hole 6 in contact with the joint 100 shown in FIG. 8 is closed, and a positive pressure of about 500 mmHg is applied from the open other end 61 (see arrow Y1 in FIG. 23) or A negative pressure of about 500 mmHg is used to reduce the pressure (see arrow Y2 in FIG. 23), and the presence or absence of leakage can be confirmed by detecting a change in the applied pressure value or a change in the reduced pressure value. .

As described above, the leak inspection method for the sheet joint portion of the second embodiment can obtain the same effect as that of the first embodiment. As a modification of the second embodiment, the first embodiment
Modifications 1 to 7 can be applied as they are. (Embodiment 3) One of the leak inspection methods for sheet joints according to claim 7 is an embodiment 3 in which two sheets made of a material including asphalt, which are used for shielding water in a wastewater treatment pond, are used as another sheet for joining. This method is applied to the case where the bonding is performed by using the method described below, and will be described below with reference to FIGS.

In the method for inspecting the leakage of the sheet joint portion of the third embodiment, two sheets 1A and 1B for laying, one sheet for joining 2 and two heat-resistant materials are prepared as preparations before the implementation. A tubular body having air permeability (hereinafter referred to as a leak testing tubular body) 7a, 7b, and the leak testing tubular body 7a, 7
auxiliary cylindrical body 8 connected to one end 70a, 70b side of b
a and 8b are prepared respectively.

The leakage inspection tubular bodies 7a and 7b are made of glass fibers woven into a long tubular shape and have an inner diameter of 1.0 mm.
The length is adjusted to be a value shorter by about 30 mm than the length L to be joined between the two sheets 1A and 1B. As the auxiliary cylindrical bodies 8a and 8b, metal pipes of copper, aluminum, brass or the like or heat-resistant rubber pipes are used, and the auxiliary cylindrical bodies 8a and 8b can be inserted along the outer periphery of the leakage inspection cylindrical bodies 7a and 7b on one end 70a and 70b side. It has an inner diameter that can be used, and has a predetermined length that is easy to apply pressure or reduce pressure.

Hereinafter, a procedure for inspecting the leakage of the sheet joint will be described. First, as shown in FIG. 27, two sheets 1A and 1B are arranged at a place where the laying is intended. The two sheets 1A and 1B are made of asphalt and have a thickness t.
Is 4 mm, the length L to be joined is 5 m, and the width W1 to be joined is 1
50 mm. The sheets 1A and 1B are arranged in a state where the front end faces 10a and 10b facing each other abut against each other. The overlapping margin area where the joining target width W1 of the sheet 1A is to be joined is the end 11a. The overlap margin area where the joining target width W1 of the sheet 1B is to be joined is the end 11b.

The tubular body 7a for leak inspection has both ends 70a,
After the auxiliary tubular member 8a is inserted into one of the sheets 70a, the sheet is placed on the upper surface 12a of the end 11a of the sheet 1A along the longitudinal direction P thereof. Leak inspection tubular body 7b
After the auxiliary tubular body 8b (see FIG. 28) is inserted into one of both ends 70b, 70b, as shown in FIG. 27, the upper surface 12b of the end 11b of the sheet 1B is
It is placed along its longitudinal direction P.

The leakage inspection tubular bodies 7a and 7b mounted as described above do not protrude at both ends 70a and 70b from the side end surfaces 13a and 13b of the sheets 1A and 1B. The joining sheet 2 is made of asphalt, has a thickness t1 of 4 mm, a joining target length L of 5 m, and a joining target width W of 300 mm. The overlap area where the joining target width W of the joining sheet 2 is to be joined is the sheet 1A.
2a facing the end 11a of the sheet 1 and the end 1 of the sheet 1B
The end 2b is opposed to the end 2b.

The joining sheet 2 is attached to the lower surface 20 of the end 2a.
Are opposed to the upper surface 12a of the end 11a of the sheet 1A in a strip shape via the leakage inspection tubular body 7a, and the lower surface 20 of the end 2b is connected to the upper surface 12 of the end 11b of the sheet 1B.
b, and are superposed in a band shape via the leakage inspection tubular body 7b (see FIGS. 1, 2 and 4). That is, the joining sheet 2 is covered so as to cover the leakage inspection tubular bodies 7a and 7b from above (see the arrow Z in FIG. 27).

Next, the joining sheet 2 is turned up, and the upper surfaces 12a and 12b of the sheets 1A and 1B and the lower surface 20 of the joining sheet 2C are combined with a propane burner (not shown), other burners, a hot iron, a hot air blower, and the like. Is heated and melted by the heating device of FIG.
b and a part of the auxiliary cylindrical bodies 8a and 8b, and the one ends 70a and 70b on the side to which the auxiliary cylindrical bodies 8a and 8b are not connected are closed, and the joint portion 100 of the water shielding structure (FIG. 30) (See the waveform of FIG. 3).

Then, a positive pressure of about 500 mmHg is applied from the auxiliary cylinders 8a, 8b to the leakage inspection cylinders 7a, 7b (see arrow Y1 in FIG. 30) or -about 500 mmHg.
(See arrow Y2 in FIG. 30). Then
Since the leakage inspection tubular bodies 7a and 7b have air permeability formed by knitting glass fibers, the longitudinal direction P of the joining portion 100 is reduced.
The positive pressure or the negative pressure can be applied to the entire area along the line, and the presence or absence of leakage can be confirmed by detecting a change in the applied pressure value or a change in the reduced pressure value.

Therefore, the method for inspecting the leakage of the sheet joint portion according to the third embodiment can efficiently perform the leakage inspection and is advantageous in terms of the inspection cost. In addition, the leakage inspection cylindrical body 7
The upper surfaces 12a, 12b of the sheets 1A, 1B and the joining sheet 2C are used as means for closing the one ends 70a, 70b of the sides of the sheets 1A, 7b to which the auxiliary cylindrical bodies 8a, 8b are not connected.
Instead of utilizing the melting and welding of the lower surface 20 of the outer peripheral surface 7, a rod-shaped body (not shown) is
An unillustrated bottomed cylindrical member may be attached to the two sides, or these may be combined.

(Embodiment 4) Another embodiment of the method for inspecting the leakage of a sheet joint according to claim 7 is a fourth embodiment, in which two sheets made of a material containing asphalt, which are used for impermeable water in a wastewater treatment pond, are used. This is applied to the case of joining using another joining sheet, and will be described below with reference to FIGS. 31 and 32 and with reference to FIGS. 28 and 29 used in the third embodiment.

As a preparation prior to carrying out the leakage inspection method of the sheet joint portion of the fourth embodiment, as a preparation, two sheets 1C and 1D for laying and a tubular body made of one heat-resistant material and air-permeable (hereinafter referred to as "the sheet"). , A leakage inspection cylindrical body) 7c, and an auxiliary cylindrical body 8c connected to one of both ends 70c, 70c of the leakage inspection cylindrical body 7c. The leakage inspection tubular body 7c has an inner diameter of 3 mm formed by knitting a glass fiber into a long tubular shape.
The length is adjusted to be about 50 mm shorter than the length L to be joined of C and 1D.

The auxiliary tubular body 8c is made of a metal pipe such as copper, aluminum, brass or the like or a heat-resistant rubber pipe, and has an inside diameter that can be inserted along the outer periphery of the one end 70c side of the leak testing tubular body 7c. It has a predetermined length and is easy to apply pressure or reduce pressure. Hereinafter, a procedure for inspecting the leakage of the sheet joint will be described.

First, the two sheets 1C and 1D are made of asphalt, have a thickness t of 4 mm, a length L to be joined of 5 m, and a width W2 to be joined of 150 mm. The overlap margin area where the joining target width W2 of the sheet 1C is to be joined is the end 11c. The width W to be joined of the sheet 1D
The overlap margin region where 2 is to be joined is the end 11d.

The tubular body 7c for leakage inspection has both ends 70c,
After the auxiliary tubular body 8c (see FIG. 28) is inserted into one of the ends 70c, the sheet is placed on the upper surface 12d of the end 11d of the sheet 1D along the longitudinal direction P as shown in FIG. Is placed. The leakage inspection tubular body 7c placed as described above does not protrude both end portions 70c, 70c from the side end surfaces 13c, 13d of the sheets 1C, 1D.

In this state, the lower surface 14c of the end 11c of the sheet 1C is opposed to the upper surface 12d of the end 11d of the sheet 1D via a part of the leakage inspection cylindrical member 7c and the auxiliary cylindrical member 8c. (See arrow Z in FIG. 31). Next, the sheet 1C is turned up,
The upper surface 12d of the end 11d of the sheet 1D and the lower surface 14c of the leading end 11c of the sheet 1C are heated and melted by a heating device such as a propane burner, other burners, a hot iron, and a hot air blower (not shown). Leakage inspection tubular body 7
c and one end 7 of the side not connected to the auxiliary cylindrical body 8c, which is welded via a part of the auxiliary cylindrical body 8c.
0c and the junction 100 of the impermeable structure (FIG. 32).
(See the waveform of FIG. 3).

Since the leakage inspection tubular body 7c is made of glass fiber and has heat resistance, the upper surface 12d of the end 11d of the sheet 1D and the tip 11c of the sheet 1C are provided.
The original shape can be maintained without disappearing even if it receives the heat at the time of melting with the lower surface 14c. Then, a positive pressure of about 500 mmHg is applied to the leakage inspection tubular body 7c from the auxiliary tubular body 8c (see the arrow Y1 in FIG. 32) or -about 500 mmHg.
(See arrow Y2 in FIG. 32).

Then, since the leakage inspection tubular body 7c has a gas permeability made of a knitted glass fiber, the joint 10
The positive pressure or the negative pressure can be applied to the entire area along the longitudinal direction P of 0, and the presence or absence of leakage is confirmed by detecting a change in the applied pressure value or a change in the reduced pressure value. Can be. Therefore, the method for inspecting the leakage of the sheet joint portion according to the fourth embodiment can efficiently perform the leakage inspection and is advantageous in terms of the inspection cost.

[0066]

According to the first aspect of the present invention, as a preparation prior to the execution of the method, the two sheets disposed at the place where the sheet is to be laid are opposed to each other and are in a belt shape. The upper surfaces of the two joining ends that are overlapped with each other and form an overlap margin along the longitudinal direction are turned up, or the upper surfaces of the two joining ends are turned up, and the opposing surfaces of the two joining ends are brought together. Is heated by a heating device such as a propane burner, a hot iron or a hot air blower, and the opposing surfaces of the two joint ends are fused and welded to form a joint of a water-blocking structure.

Then, a band-shaped covering member is adhered along the longitudinal direction to the upper surface of each end in a state where a joint is formed, and a space is left at a boundary between the ends along the longitudinal direction. , A leak inspection hole is formed along the boundary. Then, pressure is applied or reduced from the other end of the hole in a state where one end of the hole formed in the joint is closed, and a leak is detected by detecting a change in the applied pressure value or a change in the reduced pressure value. You can check the presence or absence.

Therefore, in the method for inspecting leakage of a sheet joint according to the first aspect, a band-shaped covering member is bonded to a sheet joint formed in advance as an operation required for forming a hole for leakage inspection. It can be done very simply and quickly, and can be done easily and quickly.Furthermore, the leak inspection of the sheet joint can be efficiently performed using the leak inspection holes, which is advantageous in terms of inspection cost. Become. (2) According to the method for inspecting leakage of sheet joints according to the seventh aspect, as a preparation prior to the implementation, two sheets arranged at a place where the sheet is to be laid are opposed to each other and overlapped in a band shape and joined. After the tubular body is placed on one of the two joint ends to be placed along the longitudinal region on one of the lower sides near the installation surface to be laid, the other is overlapped so as to cover from above. .

Then, the cylindrical body is sandwiched in a state where it comes into contact with the respective opposing surfaces of the two joining ends, which are the overlap margins. Next, from the other upper surface above the two joining ends,
Alternatively, the upper surfaces of the two joining ends are turned up and the opposing surfaces of the two joining ends are heated by a heating device such as a propane burner, a hot iron or a hot air blower, and heated by a propane burner, a hot iron or a hot air blower. Then, the opposing surfaces of the two joining ends are melted and welded via a tubular body to form a joint of a water-blocking structure.

For this reason, the tubular body for leakage inspection is placed only along the longitudinal region of the two joined ends when the two joined ends of the two sheets to be joined are joined by welding. Preparation for leak inspection can be promptly carried out with a simple operation, and the number of operation steps can be significantly reduced as compared with the conventional case. Then, pressure is applied or reduced from the other end opening while the one end opening of the tubular body embedded in the joint is closed, and the pressure value applied through the tubular body changes or the reduced pressure is applied. By detecting a change in the value, the presence or absence of leakage can be confirmed.

Therefore, the method for inspecting leakage of a sheet joint portion according to claim 7 can efficiently perform a leakage inspection and is advantageous in terms of inspection cost.

[Brief description of the drawings]

FIG. 1 is an exploded view showing an arrangement state in a case where two sheets to be joined, a joining sheet, a band-shaped covering member for forming a hole, and the like are joined by the method for inspecting leakage of a sheet joining portion according to the first embodiment. FIG.

FIG. 2 is a perspective view showing a state in which two sheets and a joining sheet in FIG. 1 are joined.

FIG. 3 shows a leakage inspection of a sheet joining portion using a leakage inspection hole formed by joining a band-shaped covering member for forming a hole after two sheets and a joining sheet in FIG. 2 are joined. The perspective view showing a state.

FIG. 4 is a side view showing a state in which two sheets and a joining sheet are joined as viewed from the side.

FIG. 5 shows two joined sheets and a joining sheet;
The side view which shows the state which joins the strip | belt-shaped covering member for hole formation.

FIG. 6 is a side view showing a leakage inspection hole formed by joining a band-shaped covering member for forming holes after two sheets and a joining sheet are joined.

FIG. 7 is a side view showing a state in which two sheets and a joining sheet in Modification Example 1 are joined from the side.

FIG. 8 is a side view showing a leak inspection hole formed by joining a band-shaped covering member for forming a hole after two sheets and a joining sheet in Modification Example 1 are joined.

FIG. 9 is a side view showing a state in which two sheets and a joining sheet are joined in Modification Example 2 when viewed from the side.

FIG. 10 is a side view showing a leak inspection hole formed by joining a band-shaped covering member for forming holes after two sheets and a joining sheet are joined in Modification Example 2.

FIG. 11 is a side view showing a state in which two sheets and a joining sheet according to Modification 3 are joined from the side.

FIG. 12 is a side view showing a leak inspection hole formed by joining a band-shaped covering member for forming a hole after two sheets and a joining sheet in Modification 3 are joined.

FIG. 13 is a side view showing a state in which two sheets and a joining sheet in Modification 4 are joined from the side.

FIG. 14 is a side view showing a leak inspection hole formed by joining a band-shaped covering member for forming a hole after two sheets and a joining sheet are joined in Modification Example 4.

FIG. 15 is a side view showing a state where two sheets and a joining sheet are joined in Modification Example 5 when viewed from the side.

FIG. 16 is a side view showing a leak inspection hole formed by joining a band-shaped covering member for forming holes after two sheets and a joining sheet are joined in Modification Example 5.

FIG. 17 is a side view showing a state in which two sheets and a joining sheet are joined in Modification Example 6 when viewed from the side.

FIG. 18 is a side view showing a leak inspection hole formed by joining a band-shaped covering member for forming holes after two sheets and a joining sheet in Modification 6 are joined.

FIG. 19 is a side view showing a state in which two sheets and a joining sheet are joined in Modification 7 when viewed from the side.

FIG. 20 is a side view showing a leak inspection hole formed by joining a band-shaped covering member for forming holes after two sheets and a joining sheet are joined in Modification Example 7.

FIG. 21 shows a method for inspecting leakage of a sheet joint according to the second embodiment.
FIG. 2 is an exploded perspective view showing an exploded disassembled state of joining two sheets to be joined, a band-shaped covering member for forming holes, and the like.

FIG. 22 is a perspective view showing a state where two sheets in FIG. 21 are joined.

FIG. 23 is a perspective view showing a leak inspection state of a sheet joining portion using a leak inspection hole formed by joining a band-shaped covering member for forming a hole after the two sheets in FIG. 22 are joined. FIG.

FIG. 24 is a side view showing a state in which two sheets are joined as viewed from the side.

FIG. 25 is a side view showing a state in which a band-shaped covering member for forming holes is joined to two joined sheets.

FIG. 26 is a side view showing a leak inspection hole formed by joining a band-shaped covering member for forming a hole after two sheets are joined.

FIG. 27 shows a method for inspecting leakage of a sheet joint portion according to the third embodiment.
FIG. 5 is an exploded perspective view showing an exploded disassembled state in a case where two sheets to be joined are joined with another joining sheet via a heat-resistant and air-permeable tubular body.

FIG. 28 is a heat-resistant and air-permeable tubular body used in the leak inspection method for sheet joints of Examples 3 and 4,
FIG. 4 is a perspective view showing a state before connection with an auxiliary tubular body connected to one end of the tubular body.

FIG. 29 is a perspective view showing an image obtained by applying a positive pressure or a negative pressure to a heat-resistant and air-permeable tubular body via an auxiliary tubular body.

FIG. 30 is a perspective view showing a leakage inspection state of a sheet joining portion using a heat-resistant and air-permeable tubular body after the two sheets and the joining sheet in FIG. 27 are joined.

FIG. 31 shows a method of inspecting leakage of a sheet joint portion in Example 4.
FIG. 4 is an exploded perspective view showing an exploded disassembled state when two sheets to be joined are joined via a tubular body made of a heat-resistant material and having air permeability.

FIG. 32 is a perspective view showing a leakage inspection state of a sheet joint using a heat-resistant and air-permeable tubular body after the two sheets in FIG. 31 are joined.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1A, 1B, 1C, 1D ... Sheet 100 ... Joint part 2 ... Joint sheet 3 ... Boundary part of joint part of two sheets 4, 4a, 4b, 4c, 4d ... Strip-shaped covering member for hole formation 5 ... Spacer 6: a hole for leakage inspection 7: a tubular body made of a heat-resistant material for leakage inspection and having air permeability 8 ... an auxiliary cylindrical body for leakage inspection

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Riki Takahashi 3-4-2, Higashi 3-chome, Kuki-shi, Saitama (72) Inventor Takashi Ishii 1-20-19 Ryoke, Kawaguchi-shi, Saitama Jinbo Building 403

Claims (7)

[Claims] 1. A method for inspecting leakage of a sheet joint joined by fusing and joining two sheet end portions to each other in a band shape, wherein the sheet joint portion is overlapped in a band shape. Between the boundary portion and the band-shaped coating member by a band-shaped coating member adhered to the respective end portions along the longitudinal direction and covering the boundary portion between the respective end portions along the longitudinal direction while leaving a space. Has a long hole for leak inspection formed at a pressure applied or depressurized from the other end of the hole in a state where one end of the hole is closed, and changes in the applied pressure value or reduced pressure. A method for inspecting leakage of a sheet joint portion, wherein the presence or absence of leakage is confirmed by detecting a change in a value. 2. A sheet joining apparatus according to claim 1, wherein a spacer forming said elongated hole for leakage inspection is arranged between said band-shaped covering member and a boundary portion between said ends. How to check for leaks. 3. The method according to claim 1, wherein the strip-shaped covering member has a protruding shape extending in the longitudinal direction on a back surface facing a boundary portion between the end portions. 4. The method according to claim 1, wherein the band-shaped covering member has a concave groove extending in the longitudinal direction on a back surface facing a boundary between the end portions. 5. The method according to claim 1, wherein one of the end portions has a protruding shape extending in the longitudinal direction on a facing surface facing a back surface of the band-shaped covering member. 6. The method according to claim 1, wherein one of the end portions has a concave groove extending in the longitudinal direction on a facing surface facing a back surface of the band-shaped covering member. 7. A method for inspecting leakage of a sheet joint joined by overlapping and welding each end portion of two sheets in a belt shape, wherein the sheet joint is formed at the time of the welding. It is welded through a heat-resistant, air-permeable tubular body disposed along a longitudinal region overlapped in a band shape at each end, and after welding, the one-side opening of the tubular body is closed. Pressure is applied or reduced from the other end side opening of the tubular body, and the presence or absence of leakage is confirmed by detecting a change in the pressure value applied through the tubular body or a change in the reduced pressure value. A method for inspecting leakage of sheet joints, characterized in that: