JPH059570B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a groundwater level control and alarm system using the deep well construction method.

``Conventional technology'' As is well known, the deep well method involves drilling a deep well into the ground by using drilling methods such as the earth auger method and the rotary drill method.
In addition to building a casing inside, a lifting pipe with a pump attached to the tip is installed to drain groundwater to the surface, thereby reducing the groundwater level, decompressing pressurized water, and improving soft ground. This method is especially suitable for use when the groundwater level is deep or the excavation depth is deep.

When the deep well construction method is used as a countermeasure against blistering of the ground with a floor during excavation work inside the mountain retaining wall when constructing an underground tank, control of the groundwater level becomes an extremely important task. Therefore, it was desired to systemize it.

Conventionally, as a groundwater level warning system for this type of deep well construction method, workers regularly measure the groundwater level in the deep well using a water level meter.
There is a known system that uses this to check the condition of the ground on which the floor is attached and to confirm safety, such as whether or not there are any blisters.

``Problems to be Solved by the Invention'' However, in the conventional groundwater level control and warning system, when the groundwater level rises and the ground condition is abnormal, the system is closed for 24 hours to ensure safety. A monitoring system is required, and workers must frequently visit multiple deep wells or be stationed near them to frequently measure the water level inside the deep wells. As a result, working conditions for workers are becoming harsher, and this is causing increased maintenance costs.Furthermore, it is necessary to detect abnormal water level rises that occur while workers are not measuring the water level. There were problems such as the inability to quickly respond to problems such as blistering of the ground on which the floor was attached.

The present invention has been made in view of the above-mentioned problems, and makes it possible to simultaneously detect the water levels of multiple deep wells, thereby controlling the water levels by starting and stopping the pumps during normal times, and when detecting abnormalities. The purpose of the present invention is to provide a groundwater level warning system that can instantly issue a warning when a rise in water level is detected and can quickly take measures such as blistering of the ground on which the floor is attached.

"Means for Solving the Problems" In order to solve the above problems, the present invention provides an H/H level sensor disposed in a deep well to detect an abnormal upper limit of the water level in the deep well. , and an H level sensor and an L level sensor disposed in the deep well to control a predetermined water level in the deep well, and receiving signals from the H level sensor and the L level sensor to operate the pump. A deep well control panel installed near each deep well to control the water level in the deep well by starting and stopping the well, and to measure abnormalities in the water level by receiving signals from the H/H level sensor. and an alarm device that issues an alarm by receiving an abnormality signal from the deep well control panel.

"Example" The present invention will be described below with reference to FIGS. 1 and 2. Fig. 1 and Fig. 2 show one embodiment of the present invention, Fig. 1 is a diagram for explaining the entire underground water level control alarm system of the present invention, and Fig. 2 shows a deep well. FIG.

In FIG. 1, reference numeral G indicates the ground surrounding the construction of the underground tank. An underground continuous wall W for retaining the mountain has been constructed in the ground G, and a pit H for constructing an underground tank has been excavated inside the wall W. A predetermined number of deep well construction methods were installed at predetermined locations around Pit H as a measure to prevent the ground Hb with the floor of Pit H from blistering caused by groundwater pressure. (six in this example) deep wells D1, D2,
D3, D4, D5, and D6 have been excavated.

As shown in Figure 2, the deep well D1 has a predetermined inner diameter and depth (100 m in this example) in the ground G.
A deep shaft is excavated at a certain depth, and silica sand 1, sand 2, mortar 3, and gravel 4 are filled in order from the bottom to a predetermined depth as a casing on the wall. A pipe 6 with a submersible pump 5 attached to its tip is installed inside the pipe, as well as an H/H level sensor 7 for detecting the abnormal upper limit of the water level in the deep well D1, and a pipe 6 with a submersible pump 5 attached to its tip. An H level sensor 8 and an L level sensor 9 for controlling the water level are placed at a predetermined depth. Furthermore, the piping 6 is disposed via a check valve 10, a gate valve 11, and a flow meter 12 to a drainage tank C1 provided near the deep well D1, and is connected to each of the level sensors 7, 8, 9 is connected to a deep well control panel S1 located near the deep well D1.

In addition, other deep wells D2, D3, D4, D5, D
6 has the same configuration as the deep well D1, and has an H/H level sensor, an H level sensor, and an L level sensor installed inside it, as well as a submersible pump (not shown) at the tip. Pipes 13, 14, 15, 16, with
17 are arranged. The pipes 13 and 14 are arranged up to the drainage tank C1, and the pipes 15 and 16 are arranged up to the drainage tank C2. The drain tank C1 is provided with a pipe 19 that leads to another drainage location, and the drain tank C2 is provided with a pipe 20 that is led to the same location as the pipe 19. . A pipe 17 is connected to the middle of the pipe 20.

Furthermore, deep wells D2, D3, D4, D5, D6
Nearby are deep well control panels S2, S3, S4, S5, to which level sensors (not shown) similar to the level sensors 7, 8, 9 disposed in the deep well D1 are connected. S6 is located. And the deep well control panels S2 to S
Reference numeral 6 indicates a central alarm system 21 and an alarm system 2 installed on the 270° side of the pit H (in this example, on the left side in the figure).
2. It is connected to a warning device such as a warning light (yellow) 23.

Note that the number of submersible pumps installed in the deep wells D1 to D6 is increased to two or more depending on the amount of groundwater collected in the deep wells,
Along with this, the number of sets of deep well control panels S1 to S6 is also increased.

Next, the operation of the underground water level control and alarm system having the above configuration will be explained.

When the L level sensor 9 detects that the groundwater level in the deep well D1 has fallen below that level, the submersible pump 5 is stopped by a signal from the deep well control panel S1. There is. Since the submersible pump 5 is in a stopped state, the water level in the deep well D1 rises, and when that water level is detected by the H level sensor 8, the signal from the deep well control panel S1 is again transmitted. , the submersible pump 5 is started and drains the groundwater in the deep well D1 into the drainage tank C1 through the pipe 6, thereby lowering the water level of the groundwater in the deep well D1. Similarly, in the deep wells D2 and D3, the groundwater whose water level has risen is drained by a submersible pump, and is drained into the drain tank C1 via the pipes 13 and 14.
Further, when the water level in the drain tank C1 rises above a predetermined level, the drain water is transferred to another location by a pipe 19 equipped with a pump (not shown).

Similarly, the groundwater collected in the deep wells D4 and D5 is also drained to the drainage tank C2 via pipes 15 and 16, and a pipe 20 equipped with a pump (not shown)
Accordingly, the groundwater is transported to another location together with the groundwater drained from the deep well D6.

Then, the water level in at least one of the deep wells D1 to D6 abnormally increases due to an abnormal increase in groundwater or a malfunction of the submersible pump, and the water level is detected by the H/H level sensor 7. If the alarm is detected, it is measured by the alarm board in the deep well control panels S1 to S6, and a signal is sent to alarm devices such as the central alarm device 21, the alarm device 22, and the warning light (yellow) 23 to issue an alarm. That's what I do. In this way, the water levels of the deep wells D1 to D6 are constantly measured, managed, and recorded by the deep well control panels S1 to S6.

Therefore, according to the groundwater level control and alarm system of the present invention, the water levels in the deep wells D1 to D6, which are provided around the well H excavated to construct the underground tank, are monitored by the level sensors 7, 8, and 9. The deep well control panels S1 to S6 start and stop the submersible pump 5, automatically control the groundwater level, and notify the abnormal water level by an alarm device to control the water level in the deep well. Under normal conditions, the groundwater level can be maintained in good condition by workers just making regular patrols a few times a day. It is possible to prevent blistering of the ground. In addition, even if the groundwater level rises and the groundwater situation is abnormal, the alarm system will instantly notify workers of the abnormality, so workers can check whether the ground is swollen, etc. You can quickly deal with it before it happens. This eliminates the need for workers to frequently patrol deep wells, freeing them from harsh working conditions, streamlining management, and reducing maintenance costs.

"Effects of the Invention" As explained above, the present invention provides H.
The water level in the deep well is controlled by starting and stopping the pump in response to signals from the H level sensor, H level sensor, L level sensor, and each of these level sensors. It is equipped with a deep well control panel installed near the well and an alarm device that issues an alarm by receiving abnormal signals from the deep well control panel, so it can simultaneously detect the water levels of multiple deep wells. Under normal conditions, it is possible to control the water level by starting and stopping the pump, and if an abnormal rise in the water level is detected, an alarm is sent instantly and the ground level of the floor is controlled. It has the effect of being able to quickly take measures against blisters, etc.

[Brief explanation of the drawing]

Figures 1 and 2 show one embodiment of the present invention, and Figure 1 shows a pit excavated to construct an underground tank and its hole for explaining the entire underground water level control and alarm system of the present invention. A plan view of the surrounding area, and FIG. 2 is a side sectional view of the deep well. G...Ground, D1, D2, D3, D4, D5,
D6...Deep well, S1, S2, S3, S4, S
5, S6...Deep well control panel, 5...Pump (submersible pump), 7...H/H level sensor,
8... H level sensor, 9... L level sensor, 21... Central alarm device (alarm device), 22...
... Alarm device (alarm device), 23... Warning light (alarm device).

Claims (1)

[Claims] 1. Drilling at least one deep well in the ground,
This is a groundwater level control and alarm system for the deep well construction method in which groundwater collected inside the well is drained to the surface using a pump, and is installed in the deep well to detect an abnormal upper limit of the water level in the deep well. H level sensor and L level sensor arranged in the deep well for controlling a predetermined water level in the deep well; In order to control the water level in the deep wells by starting and stopping the pumps in response to signals from the H/H level sensor, and to measure water level abnormalities in response to signals from the H/H level sensor, A groundwater level control and alarm system equipped with a deep well control panel installed in the deep well, and an alarm device that issues an alarm by receiving an abnormal signal from the deep well control panel.