JPH06984B2 - Water injection device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an underground water injection device in underground excavation work.

“Prior art” In the underground excavation work, the well point method is adopted to eliminate the spring water from the root cutting bottom 1 as shown in FIG.

This is because a pipe 2 called a riser having a strainer 2a at the tip is driven around the root cutting at intervals of 1 to several meters according to the amount of spring water, and then pumped by a vacuum pump to lower the groundwater level to the required depth. It is a method that facilitates root cutting work, and according to the Well Point method, the flow of water due to pumping is downward, so the ground is compacted, and it has the effect of stabilizing the ground as well as lowering the groundwater level, making it suitable for large-scale root cutting work. Is a very effective construction method.

Initially, the entire amount of this pumped-up water was treated as sewage, but if it is released to the sewer system, it will be unprofitable due to the sharp increase in the discharge fee. For this reason, pumped water has been recharged to the ground around Negiri. That is, reference numeral 3 in the drawing denotes a recharging pipe or well similar to the pipe 2 driven around the root cutting, which is connected to the pumping pipe 2 via a water supply header pipe 8 to pump the pumped water in the ground 4. Return to.

Then, in case of water injection failure due to clogging of the strainer at the tip of the recharging pipe 3, once the pumping supply to the pipe 3 is stopped, water is pumped from the pipe 3 to backwash the strainer and restore the function. During this time, the pumped water from the pipe 2 is treated as conventional sewage.

In the figure, 5 is an impermeable ground layer, 6 is a vacuum pump for pumping water, 7
Indicates the groundwater level, respectively.

"Problems to be solved by the invention" However, in the above-mentioned measures, the backwashing timing is often lost late because the amount of sewage treatment, which is a cost burden, is suppressed as much as possible. However, there are many cases where the cleaning effect is not improved even if the function recovery is unavoidable. Also, during backwashing, there is the inconvenience of not being able to deal with spring water from the root cutting bottom.

"Means for Solving Problems" and "Operation" The present invention has been made in view of the above circumstances, and its gist is to connect and recharge a pipe for pumping spring water through a water supply header pipe. A pipe for use is subdivided in a branching manner with respect to the water supply header pipe, and a drainage pipe is arranged in parallel with the water supply header pipe, and a switching valve for the water supply header pipe and the drainage pipe is arranged at the branch point, In addition to this, the recharging pipe is equipped with a clogging detection sensor, and a control device for switching the switching valve based on the detection signal is additionally provided to enable individual control of the recharging pipe at a suitable time. The point is that the back washing can be carried out without stopping the spring water from the root cutting bottom and keeping the sewage treatment amount low.

[Example] Hereinafter, this will be described in detail with reference to the drawings.

FIG. 1 is an explanatory view showing an advanced type device including the basic configuration of the device of the present invention.

In the figure, 9 indicates a recharging pipe that is subdivided and attached in a branched manner to the water supply header pipe 10 connected to the above-mentioned pipe for spring water pumping driven into the root cut bottom, On the other hand, reference numeral 11 denotes a drainage pipe for washing water provided in parallel with the water supply header pipe 10. The recharging pipes 9 are connected to either the water supply header pipe 10 or the drain pipe 11 by the switching valves 12 arranged at the branch points. The tip of the drain pipe 11 is connected to the sewer.

That is, the recharging pipe 9 according to the present invention is adjacent to each other and is subdivided into subdivided water, and a water supply header pipe 10 for receiving spring water pumping from the root cutting bottom and a drain pipe 11 for draining backwash pumping water. And are connected and switched by individual control.

Therefore, for the recharging pipes that are likely to deteriorate in function, the switching valve may be individually operated to apply the joint negative pressure to the drainage pipe 11 to perform cleaning. If this sort of cleaning is performed in a manner that avoids simultaneous execution by all people, the pumping from the root cutting will not be delayed.

Such mutual reverse operation is facilitated by the subdivision of the recharging pipe.

Further, under the above-mentioned operation procedure, as shown in FIG. 2, in the recharging pipe group, the pipes on both sides are in a water injection state and the central pipe is in a reverse cleaning state. However, in such a case, the central backwashing pipe is blessed with the extremely effective condition that the backwashing is performed at a high water level because the pipes on both sides are pumping the pumped water. It is advantageous.

In addition, experiments have shown that the timing is important in order to perform the function recovery cleaning of the recharging pipe more effectively, and it is not the case that the cleaning time is long, but it is necessary to use an appropriate ON / OFF pattern. It has been found that the cleaning effect can be improved in a short time if it is performed, but the above-described apparatus of the present invention that can be individually controlled can fully enjoy such merits.

Therefore, each pipe can always be maintained in an optimal state without clogging, and individual pipes can be maintained while operating the entire system by a simple operation of the switching valve. The pipe 9 also lasts longer due to such individual systematic cleaning.

In FIG. 1, 13 and 14 are pressure gauges and flow meters attached to the water supply header pipe 10, and these serve as clogging detection sensors for the recharging pipe 9. Ideally, the flowmeters are individually installed in the branch passages of the pipes 9 ...

That is, when clogging occurs, the injection pressure increases and the flow rate decreases, so it is possible to detect the degree of clogging based on this measured value.

Reference numeral 15 is a converter for converting the above-mentioned detection signal, 16 is a central processing unit (CPU) that receives the signal converted by the converter 15, and 17 is a line for automatically controlling the switching valve 12 by being supported by the CPU 16. , 18 is a display (CRT) for displaying the data sent to the CPU 16, 19 is a printer for making paper, and 20 is a floppy for storing records. By adding such an automatic control device, the detection / control system can be fully automated to reduce the running cost, and time series data of the flow rate and injection pressure can be recorded and graphed on the CPT etc. at any time. In addition to being able to do so, the state of the flow is animatedly displayed on the CPT so that the state of the entire system can be understood at a glance.

[Advantages of the Invention] As described above, according to the present invention, maintenance of the recharging pipe of the pumping water recharging system in underground excavation work can be performed extremely completely, which is convenient for construction and operation of the system. It is even more convenient because you can do it while continuing.

[Brief description of drawings]

FIG. 1 is an explanatory view of an evolved type device including the basic configuration of the present invention, FIG. 2 is an explanatory view of merits peculiar to the method of the present invention, and FIG. 3 is an explanatory view of a recharge system. 1 ... Root cut bottom, 2a ... Strainer, 2 ... Pipe,
3 ... Recharge pipe, 4 ... Ground, 5 ... Impermeable ground layer, 6 ... Pumping vacuum pump, 7 ... Groundwater level, 8 ... Water supply header pipe, 9 ... Recharge pipe, 10 ... Water supply header pipe, 11 ... Drain pipe, 12 ... switching valve, 13 ... pressure gauge, 14 ... flow meter, 15 ... converter, 16 ... central processing unit, 17 ... line, 18 ... display, 19 ... printer, 20 ... floppy.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunio Terada 2-5-14 Minamisuna, Koto-ku, Tokyo Inside the Takenaka Corporation Technical Research Institute (72) Inventor Kazuyuki Higashiyama 8-21 Ginza, Chuo-ku, Tokyo No. 1 Takenaka Corporation Tokyo Main Store (72) Inventor Hidehiko Nakazaki 2-5-14 Minamisuna, Koto-ku, Tokyo Incorporated Takenaka Corporation Technical Research Institute (56) Reference JP-A-60-105706 (JP, A) JP-A-51-124006 (JP, A)

Claims (2)

[Claims] 1. A water injection pipe to a recharging well connected via a header pipe for injecting water is subdivided into branch pipes with respect to the header pipe for water supply, and a drain pipe for backwashing is provided on the header pipe for water supply. Is installed in parallel, and a switching valve for switching between the header pipe for water supply and the water distribution pipe is arranged at the branch point. 2. A water injection pipe to a recharging well connected through a header pipe for injecting water is subdivided into branch parts with respect to the water supply header pipe, and a drain pipe for backwashing is provided on the feeder header pipe. And a switching valve for the water supply header pipe and the drain pipe at the branch point, and a recharging pipe equipped with a clogging detection sensor and the switching valve based on the detection signal. A water injection device characterized by being provided with a control device for switching operation.