JPH10339683A - Work sheet in civil engineering for detecting fracture position - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof work sheet in civil engineering that his a simple structure and can accurately detect a fracture position. SOLUTION: A plurality of continuous length conductor sheets 13 being arranged in parallel are inserted between waterproof sheets 11 and 12 being sealed watertightly and a conductor sheet 14 is also provided at an external part. The entire length of the continuous length conductor sheets is used as resistance, a bridge circuit where the short-circuited point between the fracture position of the waterproof sheet 11 and the conductor sheet 14 at the external part is a connection point is constituted, and the fracture position is detected by a potentiometer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof civil engineering sheet, which is a waterproof sheet laid on the bottom of a reservoir, an industrial waste landfill, or the like, or on the roof of a building. The present invention relates to a waterproof civil engineering sheet that can be detected by using a waterproof civil engineering sheet.

[0002]

2. Description of the Related Art In the case of reservoirs, irrigation canals, etc., in order to prevent water leakage, and in the case of industrial waste landfills, in order to prevent harmful substances from penetrating into groundwater, they must be installed on the bottom. And spread a waterproof civil engineering sheet all over the slope. The same goes for the rooftop of a building.

[0003] A flexible sheet material such as rubber, polyethylene, or polyvinyl chloride is generally used for a waterproof civil engineering sheet. However, during long-term use, natural deterioration due to sunlight or air, stress generation due to strain, external force application, etc. Causes damage. Especially for waterproof civil engineering sheets laid in industrial waste landfills,
It is necessary to sufficiently consider the possibility that the sheet will be damaged due to a direct impact at the time of throwing waste, or a gradual increase in the load on the sheet.

[0004] Damage to a waterproofing civil engineering sheet in an industrial waste landfill leads to environmental pollution, so the damage must be repaired quickly. However, for quick repairs,
First, it is necessary to accurately detect a damaged portion. One of the inventors of the present application focused on such a problem, devised a waterproof civil engineering sheet that can divide a waterproof civil engineering sheet into a plurality of cells, and detect a damaged portion by providing a dye or an electrode for each cell. (See Japanese Patent Publication No. Hei 8-1054). In this publication, three inventions are disclosed, but in the first invention, two rubber sheets are overlapped, and the two rubber sheets are adhered to each other at an appropriate linear portion to thereby provide a gap between the two rubber sheets. A plurality of sealed cells separated from each other are formed, and a different color dye is sealed in each cell. Further, in the second invention, positive and negative electrodes are provided between both rubber sheets of each cell so as not to contact each other, and a lead wire is independently drawn out for each cell and connected to an external alarm lamp or the like. In the third invention, the number of electrodes in each cell is one, and an alarm lamp or the like is connected between the ground and / or an external electrode provided in the reservoir.

[0005]

According to the above invention, the broken position can be specified on a cell basis, but it is not possible to detect a finer position. Therefore, in order to repair a damaged part, it is necessary to remove all the stored material corresponding to the cell or to insert a repair material into the entire area of the cell, which is inefficient and time-consuming in any case. Work was needed. of course,
Although the detection accuracy of the damaged position is improved by making each cell sufficiently small, in this case, there is a problem that the manufacturing cost of the waterproof civil engineering sheet increases.

The present invention has been made to solve such a problem, and an object of the present invention is to enable the position of a damaged portion to be detected with high accuracy while having a simple structure. It is to provide a waterproof civil engineering sheet.

[0007]

According to the present invention, there is provided a civil sheet capable of detecting a broken position according to the present invention, comprising: a) two water-tightly sealed waterproof sheets; and b) a waterproof sheet. It is characterized by comprising a plurality of long conductive sheets interposed and arranged in parallel between the two waterproof sheets, and c) an external sheet electrode provided outside the waterproof sheet.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, two waterproof sheets 11, 12 are laid on the bottom of a waste pond, and long conductive sheets 13 are arranged side by side so as not to overlap each other. . Further, the outer conductor sheet 14 is laid on the upper waterproof sheet 11. As shown in FIG. 2, lead wires 21 are drawn out from both sides of each conductor sheet 13, and a DC or AC power supply 22 is connected thereto, and also connected to both ends of a resistor of a potentiometer 23. Further, the external conductor sheet 14 and the slide terminal of the potentiometer 23 are connected.

When there is no problem with the waterproof sheet 11, the long conductor sheet 13 and the outer conductor sheet 14 inside the waterproof sheets 11, 12 are insulated from each other, so that the bridge circuit shown in FIG. No electricity flows to the voltmeter (or ammeter) of the potentiometer 23.

When any part of the waterproof sheet 11 is damaged, water in the waste pond enters between the two waterproof sheets at that point, and the long conductive sheet 13 and the external conductive sheet 14 conduct through the water. . Thus, a bridge circuit is formed, and the damaged position of the waterproof sheet 11 is calculated from the position of the equilibrium point of the potentiometer 23 as follows. L1: L2 = R1: R2 L1 / L = R1 / R (where L = L1 + L2, R = R1 + R2)

[0011] Thus, the civil engineering sheet 10 according to the present invention.
In this case, since the conductive sheet 13 laid between the two water-tightly sealed waterproof sheets 11 and 12 has a long shape, an external circuit for detecting a damaged position may be a simple bridge, and is complicated. No complicated circuits or control devices are required. Therefore, the system can be configured relatively inexpensively.

Instead of using a potentiometer using a resistor, a damaged position of the waterproof sheet 11 can be calculated using a variable voltage generator. That is, as shown in FIG. 6, the DC power supply 22 is connected to the conductive wires 21 drawn out from both sides of each conductor sheet 13, and also connected to the two variable voltage generators 24 and 25, respectively. Further, the external conductor sheet 14 is connected to one end of the switch 26,
The switch 26 is selectively connected to one of the variable voltage generators 24 and 25.

When there is no problem in the waterproof sheet 11, since the long conductive sheet 13 and the outer conductive sheet 14 inside the waterproof sheets 11 and 12 are insulated, the ammeter 27
There is no electricity flowing through. When any part of the waterproof sheet 11 is damaged and the long conductive sheet 13 and the external conductive sheet 14 conduct through water, the switch 26 is connected to the variable voltage generator 24 side and the ammeter 27 The voltage generated by the variable voltage generator 24 is adjusted so that the flowing electricity becomes zero. Next, the switch 26 is connected to the variable voltage generator 25 side, and similarly, the voltage generated by the variable voltage generator 25 is adjusted so that the electricity flowing to the ammeter 27 becomes zero. When adjusted in this manner, the voltage V of the variable voltage generators 24, 25
1. The damaged position of the waterproof sheet 11 is calculated from V2 as follows. L1: L2 = V1: V2 L1 / L = V1 / V (L = L1 + L2, V = V1 + V2)

In this configuration, although the circuit configuration is slightly complicated, a component which easily causes a mechanical failure such as a contact failure such as a slide terminal of a potentiometer is not used.
A more reliable detection of a damaged position can be performed.

[0015] The above-mentioned "watertight sealing" means that it is only necessary to be watertight at least at the bottom of a waste pond or the like. That is, since special consideration is given to the electrode take-out portion 16 which is generally installed in a place where it does not hit the rain,
This part does not necessarily have to be watertight.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One preferred embodiment of the present invention is shown below.
When the long conductor sheets are used independently one by one, electrodes must be provided at both ends as shown in FIG. 1 and long lead wires must be drawn from the electrodes to the potentiometer 23. Even if the potentiometer 23 is placed close to one end, a long lead must still be drawn from the other end to it. On the other hand, as shown in FIG. 3, two long conductive sheets 31 and 32 adjacent to each other are paired, and they are electrically connected at one end, so that the two electrodes are brought to the other end. And lead wires can be shortened. This is economically advantageous and also has the effect of reducing the detection error of the broken position caused by the resistance of the lead wire.

As another preferred embodiment of the present invention, FIG.
As shown in the figure, the space between the two waterproof sheets 41 and 42 is
Each of the long conductive sheets 43 may be divided into a plurality of cells, and may be divided into a plurality of cells in the longitudinal direction of each long conductive sheet 43 in a watertight manner. If the waterproof sheet 41 is damaged, the above-described detection can be immediately performed to detect the damaged position with high accuracy.
It spreads in the space between 1 and 42, and the position detection accuracy decreases. Further, since water remains inside even after the damaged portion of the waterproof sheet 41 is repaired, the water spreads inside as time passes, and even if it is damaged at another location next time, the accuracy of the detection position is initially low. Will be inaccurate from Therefore, as shown in FIG. 4, by dividing the space between the two waterproof sheets 41 and 42 into a plurality of water-tight sections, the damaged position can be detected with a high accuracy even after the second time.

As still another embodiment, a plurality of layers of a plurality of long conductive sheets arranged side by side as described above may be provided via an insulating layer of a waterproof sheet. For example, in FIG.
2 and 53, and two long conductive sheet layers 54 and 55 arranged between them as shown in FIG. In general, it is almost impossible to re-install a waterproof sheet that has already started to be used. Therefore, a high reliability is also required for a broken point detection system. Therefore, the layer of the long conductive sheet is doubled in this way, and usually the upper layer 54 is used to detect the damaged position. If the upper layer 54 cannot be used for any reason, By connecting the bridge circuit and the like in FIG. 1 to the lower layer 55 so as to continue detection of the damaged position, the reliability of the entire system can be improved.

As the inner and outer long conductive sheets, various kinds such as a metal net, a conductive resin, a conductive nonwoven fabric, and a conductive paint applied to the inner surface of a waterproof sheet can be used. .

When the waterproof sheet 11 is to be repaired after the damaged portion is detected as described above, a hole is drilled in the accumulated waste, and when the tip of the hole reaches the damaged portion, the resin repair is performed. This is done by putting the material into the hole.
At this time, by making a hole in the waste while detecting conduction between the drill and the inner conductive sheet 13, work can be performed while reliably detecting whether or not the hole is correctly approaching the damaged portion. You can proceed.

[Brief description of the drawings]

FIG. 1 is a plan view (a) and a sectional view (b) of a civil engineering sheet showing an embodiment of the present invention.

FIG. 2 is a circuit diagram of a system for detecting a broken position of the civil engineering sheet.

FIG. 3 is a plan view showing a method for connecting a long conductive sheet according to the first embodiment of the present invention.

FIG. 4 is a plan view of a civil engineering sheet according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a civil engineering sheet according to a third embodiment of the present invention.

FIG. 6 is a circuit diagram of another system for detecting a broken position of a civil engineering sheet.

[Explanation of symbols]

Reference Signs List 10 civil engineering sheet 11, 12, 41, 42, 51, 52, 53 waterproof sheet 13, 31, 32, 43, 54, 55 long conductor sheet 14, 56 external conductor sheet 16 electrode extraction portion DESCRIPTION OF SYMBOLS 21 ... Conductor 22 ... Power supply 23 ... Potentiometer 24, 25 ... Variable voltage generator

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Motohiro Kojima 27, Tashinshujo, Kumiyama-cho, Kuse-gun, Kyoto Prefecture Inside Tsuda Elec Co., Ltd. (72) Inventor Sadao Shindo 9-2 Honda Ueno, Momoyama-cho, Fushimi-ku, Kyoto

Claims (4)

[Claims] 1. a) two waterproof sheets sealed in a watertight manner; b) a plurality of long conductive sheets interposed between the two waterproof sheets and arranged in parallel; An external sheet electrode provided outside the sheet, comprising: a civil sheet capable of detecting a damaged position. 2. The civil engineering sheet according to claim 1, wherein two adjacent long conductive sheets are electrically connected at one end. 3. A plurality of cells are watertight so that the space between the waterproof sheets is divided for each long conductive sheet and is divided into a plurality in the longitudinal direction of each long conductive sheet. The civil engineering sheet according to claim 1, wherein the civil engineering sheet is sectionable. 4. The damaged position detecting device according to claim 1, wherein a plurality of layers of the plurality of long conductive sheets arranged side by side are provided via an insulating layer made of a waterproof sheet. Possible civil engineering sheets.