JP3158168B2 - Recharge method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recharging method which is carried out when returning groundwater pumped during root excavation work or the like to a recharge well, and more particularly, pumping with high turbidity of suspended matter to the outside. The present invention relates to a recharging method for discharging and maintaining the condensing capacity of a recharge well by automatic control.

[0002]

2. Description of the Related Art In a root cutting work performed for a foundation work of a building or the like, it is a common practice to lower a groundwater level by pumping groundwater to enable dry work. On the other hand, for the purpose of reducing or preventing damage such as subsidence of the surrounding ground caused by pumping of groundwater, lowering of water levels and depletion of wells, etc., the pumped groundwater is returned to the ground through nearby recharge wells. The so-called recharge method (condensation method) is also widely practiced.

[0003]

The above-mentioned conventional recharging method does not maintain and control the condensing capacity of the recharge well by automatic control, but only measures the concentration of suspended solids contained in groundwater occasionally. , Pumping and pouring water as needed. In fact, cleaning of recharge wells with reduced condensate capacity is not performed regularly, but is performed appropriately. For this reason, groundwater containing suspended matter such as mud mixed with pumped water (groundwater) is directly injected into the recharge well. If the turbidity of the suspended matter in the groundwater in the recharge well exceeds a predetermined value and used for a long time, the recharge well is clogged, the condensing capacity is reduced, and the recharge well does not function. Also, if the recharge well is not cleaned regularly, it cannot cope with a sudden increase in the concentration of suspended matter in the groundwater, causing clogging in a short period of time.
In addition, the movement of particles in the ground surrounding the recharge well further promotes clogging in the recharge well. That is, once clogging occurs, it is difficult to return to a normal state easily, and these points are problems to be solved.

Therefore, an object of the present invention is to discharge groundwater containing suspended matter of a certain concentration or more immediately to the outside and to periodically clean the recharge well to maintain the condensing capacity of the recharge well by automatic control. An object of the present invention is to provide a recharging method for the purpose of doing so.

[0005]

As a means for solving the above problems, a recharge method according to the present invention is a recharge method in which groundwater 2 pumped from a pumping well 7 is returned to the ground 4 through a recharge well 3. Pumping well 7
The pumping pipe 6 started from the pump 5 is provided with a control device 1 having a turbidity sensor for detecting the turbidity of the suspended matter in the pumping water, and a water supply pipe 10 leading to the recharge well 3 via the switching valve 8. And a drain pipe 11 is provided branching from an intermediate portion between the switching valve 8 and the control device 1 with a turbidity sensor,
When the turbidity sensor-equipped control device 1 detects a suspended matter having a predetermined turbidity or more, the switching valve 8 is closed, and the pumped water having a high turbidity of the suspended matter is discharged to the outside through the drain pipe 11, and the predetermined turbidity is discharged. The following pumping is performed through the water injection pipe 10 and the recharge well 3
It is characterized by returning to.

[0006] As a method of cleaning the recharge well,
Flow switch 9 on water pipe 10 leading to recharge well 3
At the same time, a level switch 12 is mounted on the upper part of the recharge well 3, and based on the detected value of the flow rate switch 9 and the detected value of the level switch 12,
When the clogging is detected, the control device 1 with the turbidity sensor
The switching valve 8 is closed by the cleaning pump 13 for the recharge well 3 and the groundwater 2 in the recharge well 3 is closed.
Is discharged to the outside through the washing pipe 14 to eliminate clogging.

[0007]

When the control device with a turbidity sensor connected to the pumping pipe detects a suspended matter having a predetermined turbidity or more contained in the groundwater pumped from the pumping well, the control is automatically switched. The valve 8 is closed, and the pumped water having a high concentration of the suspension is discharged to the outside through the drain pipe 11. When the pumped water is equal to or lower than the predetermined turbidity, the switching valve 8 is kept open, and the pumped water is returned to the recharge well 3 through the water injection pipe 10. Since only the groundwater 2 having a low suspended solid concentration that does not hinder recharging (condensation) is condensed, the condensing capacity of the recharging well 3 can be favorably maintained for a long time.

When the condensed water stays in the recharge well 3 due to clogging of the recharge well 3 due to the long-time condensate, the flow rate of the condensate passing through the water injection pipe 10 is detected by the flow rate switch 9 as a detection value. On the other hand, when the water level of the well that has accumulated and rises in the recharge well 3 reaches the height of the level switch 12 and appears as a detection value of the level switch 12, it is determined that the recharge well 3 is clogged. That is, the switching valve 8 is automatically closed by the control device 1 with the turbidity sensor based on the two detected values, and then the pump 13 for cleaning the recharge well 3 is transmitted by the signal sent from the control device 1 with the turbidity sensor. Operates to suck up the water in the recharge well 3 and discharge it to the outside through the washing pipe 14. When the water in the recharge well 3 is sucked up by the cleaning pump 13, the particle motion of the ground around the recharge well 3 is activated, and the cleaning pump 13 is stopped when the clogging is eliminated by the so-called backwashing action. Then, the switching valve 8 is opened again, and the pumped water (groundwater 2) from the pumping well 7 is injected into the recharge well 3 through the water injection pipe 10.

[0009]

Next, an embodiment of the present invention shown in the drawings will be described. FIG. 1 shows an embodiment of a recharge method in which groundwater 2 pumped from a pumping well 7 is returned to the ground 4 through a recharging well 3. The pumping pipe 6 started from the pump 5 of the pumping well 7 is connected to the control device 1 with the turbidity sensor on the ground. The control device 1 is a device having a built-in transmission type turbidity sensor (not shown), and the turbidity sensor detects the turbidity of the suspended matter contained in the pumped ground water 2. A switching valve 8 that opens and closes the water injection pipe 10 is mounted in the middle of the water injection pipe 10 that leads from the control device 1 with the turbidity sensor to the recharge well 3, and the switching valve 8 is electrically connected to the control device 1. I have. Accordingly, the opening and closing of the switching valve 8 is automatically controlled by the control device 1. Next, a drain pipe 11 is provided branched from an intermediate portion between the switching valve 8 and the control device 1 with a turbidity sensor. Therefore, regarding the turbidity in the pumping water, by setting the detection value of the control device 1 with a turbidity sensor in advance so as to react with a suspended matter having a predetermined turbidity or more, the set value (predetermined turbidity) or more is set. When the suspended matter is detected, the switching valve 8 is closed, and the pumped water (ground water 2) having a high concentration of the suspended matter is discharged to the outside through the drain pipe 11. On the other hand, the pumped water (groundwater 2) having the predetermined turbidity or less is supplied as it is to the injection pipe 10
Through the recharge well 3 to return it to the ground. Since only the groundwater 2 having a low suspended solid concentration that does not hinder condensing is condensed (water-injected), long-term recharging can be performed with a good condensing capacity.

Next, in order to carry out a method for automatically cleaning the clogging of the recharge well 3, a flow switch 9 capable of detecting the flow rate of the water is attached to the water injection pipe 10 leading to the recharge well 3. . This flow switch 9 is also electrically connected to the control device 1 with a turbidity sensor, and the detection value of the flow switch 9 is input to the control device 1 with a turbidity sensor, and is used as data for automatic control. A level switch 12 capable of detecting the water level in the well is mounted above the recharge well 3, and this level switch 12 is also electrically connected to the control device 1. When a detected value of the water level of the recharge well 3 is input to the control device 1 by the level switch 12, an automatic control system in which the switching valve 8 is closed by the control device 1 is assembled.

Therefore, it is detected by the flow rate switch 9 that the pumped water flows into the recharge well 3 at a constant flow rate, and the water level in the recharge well 3 reaches the height of the level switch 12 so that the water level is reduced. When the rise is detected, the controller 1 with the turbidity sensor determines that the recharge well 3 is clogged based on these two detected values,
First, the switching valve 8 is closed. Subsequently, the control device 1
Pump 13 for recharge well 3 by signal from
Is started, and the water in the recharge well 3 is discharged to the outside through the cleaning pipe 14. If this discharge state is continued for a while, clogging is eliminated by the backwashing action due to the backflow of groundwater in the ground around the well. Therefore, when the pumping water (groundwater 2) having a predetermined turbidity or less is again injected from the pumping well 7 after a certain time, the condensate smoothly permeates into the surrounding ground from the recharge well 3 where the clogging has been eliminated. In addition,
If a timer is built in the control device 1 with a turbidity sensor of the present embodiment, the recharge well 3 is periodically cleaned, and clogging can be effectively prevented.

In short, the maintenance of the recharge well 3 is automatically controlled through the control unit 1 with the turbidity sensor.

[0013]

According to the recharging method according to the present invention, clogging of the recharge well can be prevented as much as possible, and the condensing capacity of the recharge well can be maintained well for a long time. The building can be performed safely and reliably, and contributes to the construction of structures with high workability, quality and reliability. In addition, when clogging occurs in the recharge well, the recharge well is automatically cleaned, so that the clogging can be effectively eliminated, the condensing capacity is restored, and root cutting work and the like are smoothly performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a recharge method according to the present invention.

[Explanation of symbols]

 Reference Signs List 7 pumping well 2 groundwater 3 recharge well 4 ground 5 pumping pump 6 pumping pipe 1 control device with turbidity sensor 8 switching valve 10 water injection pipe 11 drainage pipe 9 flow switch 12 level switch 13 washing pump 14 washing pipe

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent owner 000219875 Tokyu Construction Co., Ltd. 1-16-14 Shibuya, Shibuya-ku, Tokyo (73) Patent owner 000147626 Aoki Construction Co., Ltd. 1-chome, Oyodominami, Kita-ku, Osaka-shi, Osaka No. 4-15 (72) Inventor Toshiaki Ishise 2-5-1 Minamisuna, Koto-ku, Tokyo Inside the Research Institute of Takenaka Corporation (72) Inventor Daiji Oda 2-5-1, Minamisuna, Koto-ku, Tokyo Stock Inside the Takenaka Corporation Technical Research Institute (72) Inventor Gen Kimura 2-5-1-14 Minamisuna, Koto-ku, Tokyo Stock Company Inside the Takenaka Corporation Technical Research Institute (72) Inventor Takeki Fujii 8--21 Ginza, Chuo-ku, Tokyo No. 1 Takenaka Civil Engineering Co., Ltd. (72) Inventor Akira Morishima 8-21-1, Ginza, Chuo-ku, Tokyo Co., Ltd. Takenaka Civil Engineering Co., Ltd. (72) Shinichi Sanada Chuo-ku, Sapporo 4-1-1, Tsutonishi Inside the Hokkaido Branch of Takenaka Civil Engineering Co., Ltd. Within the Ministry of Civil Engineering (72) Inventor Toru Kumakura 2-10-2 Otowa, Bunkyo-ku, Tokyo Inside the Advanced Construction Technology Center (72) Inventor Keiji Hiroi 302-1 Tanaji Soneshita, Sagamihara City, Kanagawa Prefecture Tokyu Construction Inside Technical Research Institute Co., Ltd. (72) Inventor Toshinobu Ebe 6-19-20 Tsukiji, Chuo-ku, Tokyo Inside Aoki Construction Research Institute Co., Ltd. (56) References JP-A-60-105706 (JP, A) JP-A-63 -277322 (JP, A) JP-A-3-235814 (JP, A) JP-A-6-49870 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 3/10 E03B 3/15 E03B 5/04

Claims (2)

(57) [Claims] A recharge method for returning groundwater pumped from a pumping well to the ground through a recharging well.
The pumping pipe, which is set up from the pump of the pumping well, is a control device with a turbidity sensor that detects the turbidity of suspended matter during pumping.
And a water pipe connected to a recharge well via a switching valve, and a drain pipe is provided by branching from an intermediate portion between the switching valve and the control device with a turbidity sensor. When the above suspension is detected,
The switching valve is closed, the pumped water having a high turbidity of the suspension is discharged outside through the drain pipe, and the pumped water having a predetermined turbidity or less is returned to the recharge well through the water injection pipe.
Recharge method. 2. A flow switch is mounted on an injection pipe leading to a recharge well, and a level switch is mounted on an upper part of the recharge well, and clogging of the recharge well is detected based on a detected value of the flow switch and a detected value of the level switch. Then, the switching valve is closed by the control device with the turbidity sensor, and groundwater in the recharge well is discharged to the outside through the washing pipe by the washing pump of the recharge well to eliminate clogging. The recharge method according to claim 1.