JPS6018737A - Method for investigating leaking water from reservoir - Google Patents

Abstract

PURPOSE:To determine the path of water leakage quickly, by putting a tracer into the underground water in an investigating boring hole, and sequentially measuring the electric conductivity state of current flowing the underground water with the elapse of time in a plurality of boring holes, which are provided along the crown of an embankment. CONSTITUTION:When a water leaking part 4 is found in an outer slant surface 3 of an enbankment 1, a plurality of boring holes 6 are provided to a depth lower than the underground water level in parallel along a crown 5 of the embankment 1. One investigating boring hole 8 is provided to the depth lower than the ground water level in a slant surface 7 of the water reserving side of the embankment 1. A current is sequentially conducted to a pluraity of lead wires 10 at a specified time interval by a timer. The electric conductivity of the underground water 15 in the respective boring hole 6 is sequentially measured by a conduction meter 13 and recorded by a recorder 14. Under this state, salt is put in the underground water in the investigating boring hole 8. Then the salt concentration of the underground water in one of the plurality of the boring holes 6 is increased and the electric conductivity is changed. The path of the water leakage can be quickly acknowledged by the change in electric conductivity.

Description

[Detailed description of the invention] A plurality of polling holes are drilled, a survey polling hole is drilled on the water storage side of the dam below the groundwater level, and an electrode is inserted below the groundwater level in each of the plurality of polling holes. A reservoir water leakage investigation method characterized by passing a current through an electrode and injecting a tracer into the groundwater in the above-mentioned investigation boreholes, and then sequentially measuring the state of current conduction in the groundwater in the plurality of above-mentioned boreholes over time. The purpose is to maintain aging reservoirs.

To explain the embodiment of the present invention shown in the drawings, in a reservoir 2 formed by a last stage 1, a water leakage point 4 is found on the outer slope 3 of the dam 1. In this state, along the top edge 5 of the dam 1, A plurality of (14) polling holes 6 are drilled in parallel to below the groundwater level. Also, one survey poling hole 8 is drilled on the water storage side slope 7 of the dam 1 to below the groundwater level. The position of this investigation polling hole 8 may be appropriately determined on the opposite side of the water leakage point 4 with the plurality of parallel polling holes 6 as a boundary, as shown in FIG. As shown in FIG. 4 or FIG. 5, positive and negative electrodes 9, 9 are inserted into the plurality of polling holes 6 below the water level, and a lead of 1 ml! 10
is connected to the switching device 12 in the instrument shed 11 on the ground, the conductivity meter 13 is connected to the same device 12, and the recorder 1 is connected to the switching device 12 in the instrument shed 11 on the ground.
Connect to 4. The switching device 12 has a plurality of connection terminals, a plurality of (28) lead wires 10 from a plurality of polling holes 6 are connected to the terminal, and a timer sequentially applies current to the plurality of lead wires 10 at fixed time intervals. (Alternating current is better without corroding the electrodes) is made conductive, and the conductivity of the groundwater 15 in each poling hole 6 is sequentially measured by the conductivity meter 13 and recorded by the recorder 14 (this record is recorded in the sixth (shown in figure). In this state, when a tracer (salt) is introduced into the groundwater 15 in the survey poling hole 8, the salt concentration in the groundwater 150 in any one of the plurality of polling holes 6 increases and the conductivity changes. Figure 6 shows the 6th and 7th drops in the third measurement after adding salt. This is the 6.7th Pauline thing. Therefore, the water leakage can be stopped by injecting mint milk or a water stop agent through the polling hole 6.6. In addition, 1 in the figure
6 is a water intake gutter pipe, and 17 is an open/close type water intake.

Conventional water leakage detection methods involve injecting dye (fluorescent soda, etc.) into the reservoir and identifying it at the point of water leakage, which makes it difficult to confirm the leakage route and causes defects that make it difficult to properly stop the water. there were.

The present invention has been made in view of the above-mentioned defects, and since the present invention uses the above-described method, it is possible not only to determine the water leakage route extremely quickly at the top 5 portion of the dam 1, but also to make it possible to drill holes in the water leakage route. The poling hole 6.6 can be used for injecting a water stopper.

[Brief explanation of the drawing]

Fig. 1 is a Y-plane view showing the pond leakage investigation method of the present invention, Fig. 2 is a vertical cross-sectional view of a dam, Fig. 3 is a perspective view of the same investigation method, and Figs. 4 and 5 are each with an electrode inserted. Figure 6 is a side view of the conductive layer hour meter. 1...Weir, 5...Top, 6...Poling hole, 8...
Survey poling hole, 9.9...electrode, 15...groundwater. Patent applicant: Koji Aihara, Kishimoto Pauling Co., Ltd.

Claims (1)

[Claims] (1) A plurality of polling holes 6 are drilled along the crest 5 of the dam 1 to below the groundwater level, and investigation polling holes 8 are drilled to below the groundwater level on the water storage side of the dam 1, and the above-mentioned plurality of polling holes After inserting electrodes 9.9 below the groundwater level of each of the plurality of polling holes 6 and passing a current through the electrodes 9.9 and injecting a tracer into the groundwater 15 of the plurality of polling holes 6, the groundwater in the plurality of polling holes 6 is A reservoir water leakage investigation method characterized by sequentially measuring the conduction state of the current of No. 15 over time.