JP3683055B2 - Surface electrode unit for water leakage detection and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water leak detection surface electrode unit that is laid on the lower surface of a water shielding sheet of a waste disposal site, for example, and detects a breakage point of the water shielding sheet.
[0002]
[Prior art]
As a conventional technique, a surface electrode unit is formed by fixing a surface electrode made of aluminum sheet with an adhesive on the upper surface of a protective mat made of resin or non-woven fabric, and this surface electrode unit is disposed on the ground (bottom surface) of a waste disposal site. And a water shielding sheet was laid on the surface electrode unit.
[0003]
[Problems to be solved by the invention]
In the above-described conventional one, the surface electrode does not directly contact the ground (bottom surface) of the waste disposal site, so that the surface electrode is not damaged by the undulations or protrusions on the ground. However, since the surface electrode is located on the upper surface of the protective mat, when laying the surface electrode unit on the waste disposal site and when laying the water shielding sheet on the upper surface of the surface electrode unit, the shoes, tools, etc. There are drawbacks in that an obstacle comes into contact with the surface electrode and the surface electrode is damaged, or the laying operation cannot be performed quickly. Further, when the surface electrode is fixed to the protective mat with an adhesive, the surface electrode at the connection location is difficult to peel off from the protective mat, and it is difficult to connect the surface electrodes. An object of the present invention is to obtain a novel surface electrode unit for water leakage detection that eliminates the above-mentioned drawbacks.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows. That is, a nonwoven fabric is superimposed on the upper and lower surfaces of a surface electrode formed in a sheet shape or a net shape with a conductive material, and the inner peripheral portion excluding the outer peripheral portion of these overlapping portions is needle punched and positioned on the inner peripheral portion. The upper and lower nonwoven fabric fibers are entangled with each other to provide a plurality of surface electrode units in which the outer peripheral surface electrodes and the upper and lower nonwoven fabrics are separated from each other, and the outer peripheral surface electrodes of each surface electrode unit are overlapped with each other. The upper and lower nonwoven fabrics on the outer peripheral portion are covered with the overlapped surface electrodes, and the outer peripheral portion is needle punched to entangle the fibers of the upper and lower nonwoven fabrics located on the outer peripheral portion. It is. In this case, the upper surface side nonwoven fabric may be formed of fibers having a hydrophilic group.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 is a schematic cross-sectional view showing a state in which the present invention is applied to a waste disposal site, FIG. 2 is an enlarged cross-sectional view of a main part of a surface electrode unit according to the present invention, and FIG. 3 is a surface electrode unit according to the present invention. FIG. 4 is a schematic side view showing a manufacturing method according to a second example of the surface electrode unit according to the present invention, and FIG. 5 is a part of the surface electrode unit according to the present invention. Fig. 6 is a partially enlarged sectional view taken along line VI-VI, Fig. 7 is a partially plan view showing connecting portions of the surface electrode units, Fig. 8 is a sectional view taken along line VIII-VIII, and Fig. 9 is a surface with a reinforcing sheet. FIG. 10 is an enlarged sectional view of another surface electrode with a reinforcing sheet.
[0006]
In FIG. 1, 1 is a waste disposal site, and a sheet-like surface electrode unit 3 in which upper and lower surfaces of a surface electrode 4 are covered with nonwoven fabrics 5a and 5b is laid on the entire bottom surface of a recess 2 dug to a predetermined depth. A rubber or synthetic resin non-water-permeable sheet, that is, a water shielding sheet 6 is laid on the upper surface of the surface electrode unit 3. The water-impervious sheet 6 prevents the sewage contaminated by the waste 7 accommodated in the recess 2 from penetrating into the underground. Moreover, the electrical characteristic value between the waste 7 accommodated in the said surface electrode 4 and the recessed part 2 is regularly measured with the measuring instrument 8, and the presence or absence of defects, such as a breakage | damage of the water shielding sheet 6 and a junction part, is determined. . Reference numeral 9 denotes a moving electrode, which is moved in the horizontal direction and inserted into each measurement point on the waste 7, such as a natural potential, an AC impedance, an AC current value, a DC current value, etc. between these parts and the surface electrode 4. This is for measuring electrical characteristic values.
[0007]
As shown in FIG. 2, the above-described surface electrode unit 3 has an upper surface nonwoven fabric 5a and a lower surface nonwoven fabric 5b superimposed on both upper and lower surfaces of a surface electrode 4 made of an aluminum sheet, a stainless mesh, or a conductive sheet. The surface electrodes 4 are held by interlacing the fibers in 5b. In this case, the thickness of the lower surface nonwoven fabric 5b may be slightly thicker than that of the upper surface nonwoven fabric 5a.
[0008]
FIG. 3 shows a manufacturing method according to the first example of the surface electrode unit 3. In FIG. 3, reference numeral 10 denotes a third drum arranged in the upper stage, and a second drum 11 and a first drum 12 are sequentially arranged in parallel below the third drum 10, and the third drum 10 and the first drum 12 are connected to each other. Is wound with a belt-like upper nonwoven fabric 5a and a lower nonwoven fabric 5b that have been needle punched and have a relatively high density, and the second drum 11 is wound with a surface electrode 4 formed in a band shape by an aluminum sheet.
[0009]
The upper surface nonwoven fabric 5a is formed of fibers having a hydrophilic group, for example, nylon fibers or acrylic fibers, and has water absorbing and hygroscopic functions. As a result, water leaked from the above-described breakage of the water-impervious sheet 6 and defective portions such as joints is captured in the upper surface nonwoven fabric 5a, and the water-impervious sheet 6 by the measuring instrument 8 is made so that the conductivity of this part is increased. This makes it easy to determine the leakage location
[0010]
A belt conveyor type field apron 13 is disposed on the right side of the first drum 12, a needle punch 14 is disposed on the right side of the field apron 13, and a delivery roll 15 is disposed on the right side of the needle punch 14.
[0011]
Then, while pulling out the upper surface nonwoven fabric 5a, the lower surface nonwoven fabric 5b and the surface electrode 4 from the drums 10 to 12, they are superposed on the field apron 13 and moved toward the needle punch 14 on the right side. Next, the needle punch 14 is moved up and down to pierce the needle 14a from the upper surface nonwoven fabric 5a toward the surface electrode 4 and the lower surface nonwoven fabric 5b, so that the fibers in the upper surface nonwoven fabric 5a and the fibers in the lower surface nonwoven fabric 5b are entangled with each other. The lower surface nonwoven fabrics 5a and 5b are joined, the surface electrode 4 is held by the upper and lower surface nonwoven fabrics 5a and 5b to form the surface electrode unit 3, and the formed surface electrode unit 3 is directed rightward by the delivery roll 15. And pull out.
[0012]
FIG. 4 shows a manufacturing method according to the second example of the surface electrode unit 3. In FIG. 4, 12 is the 1st drum arrange | positioned in the lower stage, The belt-shaped lower surface nonwoven fabric 5b by which the needle punch process was carried out to this 1st drum 12, and the density became comparatively high is wound. A second drum is disposed above the first drum, and a band-shaped surface electrode 4 formed in a band shape by an aluminum aluminum sheet is wound around the second drum 11. Further, a mounting shelf (not shown) is disposed above the second drum 11, and a web-shaped upper surface nonwoven fabric 5 a having a low density is folded and stacked (folded) on the mounting shelf.
[0013]
Then, the upper surface nonwoven fabric 5 a, the surface electrode 4, and the lower surface nonwoven fabric 5 b are pulled out from the placement shelf and the drums 11 to 12 on the field apron 13 and are moved toward the needle punch 14 on the right side. Next, as in the first example described above, the needle punch 14 is moved up and down to pierce the needle 14a from the upper surface nonwoven fabric 5a side toward the surface electrode 4 and the lower surface nonwoven fabric 5b, and the fibers in the upper surface nonwoven fabric 5a and the lower surface nonwoven fabric 5b. The upper and lower surface nonwoven fabrics 5a and 5b are joined with each other, and the surface electrode unit 3 is formed by holding the surface electrode 4 with the upper and lower surface nonwoven fabrics 5a and 5b. Pull it out to the right by the delivery roll 15.
[0014]
As shown in FIGS. 5 and 6, the surface electrode unit 3 is formed in a strip shape having a left and right width L of about 2000 mm and a length of 5000 mm to 10000 mm. The inner peripheral portion excluding the portion) is needle punched to entangle the fibers in the nonwoven fabrics 5a and 5b on the upper and lower surfaces to hold the surface electrode 4. The width L2 of the outer peripheral portion 3a is about 100 mm. If it does in this way, as shown in FIG. 6, the outer peripheral part 3a of the surface electrode unit 3 will isolate | separate the nonwoven fabric 5a, 5b of the upper and lower surfaces, and as shown in FIG. 7, FIG. When connecting the -1 and 3-2 comrades, it is easy to connect the surface electrodes 4 and 4 comrades of the outer peripheral part 3a of both, and to connect the nonwoven fabrics 5a and 5b of the upper and lower surfaces alternately. it can.
[0015]
In addition, you may make it perform the needle punch process of the said surface electrode unit 3 over the whole surface. Further, the surface electrode 4 has an aluminum stay 4a fixed to the upper surface of the reinforcing cloth 4b as shown in FIG. 9, or an aluminum stay 4a fixed to the upper surface of the resin film 4c as shown in FIG. Further, a tensile force may be provided by the reinforcing cloth 4b and the resin film 4c. In this case, the lower and upper surface nonwoven fabrics 5a and 5b can use inexpensive and low tension ones.
[0016]
【The invention's effect】
As is clear from the above description, the surface electrode unit according to the present invention surrounds the upper and lower surfaces of the surface electrode with the upper surface nonwoven fabric and the lower surface nonwoven fabric, so that the lower surface of the surface electrode is the ground surface of a waste treatment plant or the like during the laying operation. While not contacting the (bottom surface), obstacles such as shoes and tools of the operator do not contact the top surface of the surface electrode, the surface electrode is not damaged, and the laying operation can be performed quickly.
In addition, since the surface electrodes are sandwiched between the upper surface nonwoven fabric and the lower surface nonwoven fabric, and these are needle-punched to join the fibers in the nonwoven fabric on the upper and lower surfaces side together, the above three members are bonded with an appropriate force, When laying, the nonwoven fabric on the upper and lower surface sides is not carelessly peeled off, and the nonwoven fabric on the upper and lower surfaces of the connection portion can be easily separated, so that the surface electrode units can be easily connected. In this case, if only the inner peripheral portion excluding the outer peripheral portion is needle punched, the surface electrode units can be more easily connected.
Further, since the band-shaped upper nonwoven fabric, the surface electrode, and the lower nonwoven fabric are fed out while being superposed on each other and the overlapping portion is subjected to needle punching, the surface electrode unit can be efficiently produced.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a state in which the present invention is applied to a waste disposal site.
FIG. 2 is an enlarged cross-sectional view of a main part of a surface electrode unit according to the present invention.
FIG. 3 is a schematic side view illustrating a manufacturing method according to a first example of a surface electrode unit according to the present invention.
FIG. 4 is a schematic side view illustrating a manufacturing method according to a second example of a surface electrode unit according to the present invention.
FIG. 5 is a partial plan view of a surface electrode unit according to the present invention.
6 is a partially enlarged cross-sectional view taken along line VI-VI in FIG.
FIG. 7 is a partial plan view showing a connection portion between surface electrode units.
8 is a cross-sectional view taken along the line VIII-VIII in FIG.
FIG. 9 is an enlarged sectional view of a surface electrode with a reinforcing sheet.
FIG. 10 is an enlarged cross-sectional view of another surface electrode with a reinforcing sheet.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Waste disposal site 2 Recessed part 3 Surface electrode unit 3a Outer peripheral part 4 Surface electrode 5a Upper surface nonwoven fabric 5b Lower surface nonwoven fabric 6 Water shielding sheet 7 Waste 8 Measuring instrument 9 Moving electrode 10 Third drum 11 Second drum 12 First drum 13 Field Apron 14 Needle punch 14a Needle 15 Delivery roll

Claims (2)

The nonwoven fabric (5a, 5b) is superimposed on the upper and lower surfaces of the surface electrode (4) formed in a sheet shape or net shape with a conductive material, and the inner peripheral portion excluding the outer peripheral portion of these overlapping portions is subjected to needle punch processing. By interlacing the fibers of the upper and lower nonwoven fabrics (5a, 5b) located in the inner peripheral portion, the surface electrode (4) of the outer peripheral portion (3a) and the upper and lower nonwoven fabrics (5a, 5b) are separated from each other. A plurality of surface electrode units (3-1, 3-2) are provided, and the surface electrodes (4, 4) of the outer peripheral portions (3a, 3a) of the surface electrode units (3-1, 3-2) are overlapped with each other. In addition, the superposed surface electrodes (4, 4) are covered with upper and lower nonwoven fabrics (5a, 5b) on the outer peripheral portions (3a, 3a), and the outer peripheral portions (3a, 3a) are subjected to needle punching. Of the upper and lower nonwoven fabrics (5a, 5b) located on the outer periphery. Water leakage detecting surface electrode unit, characterized by comprising entangled together維同workers. The surface electrode unit for water leakage detection according to claim 1, wherein the nonwoven fabric (5a) on the upper surface side is formed of fibers having a hydrophilic group.

Images