JPH0772414B2 - Groundwater level management method and apparatus for deep well 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 method and apparatus for automatically controlling the groundwater level in the deep well method.

[0002]

2. Description of the Related Art In building construction and large-scale construction work, a foundation work is performed by excavating deep into the ground. In this case, a pipe is built up to the groundwater layer, and groundwater is pumped to a predetermined level by a pump arranged in the pipe. Deep well method is used to adjust the water level by draining to the stable water level. A conventional deep well method will be described with reference to FIGS. 3 and 4. 3 is a schematic cross-sectional view for explaining the deep well method, and FIG. 4 is a perspective view showing the pipe in FIG. In the figure, 5 is a pipe, 6 is a pump, GL is the ground surface, K is the foundation, K1 is the root cutting, N is the clay layer, HL is the stable groundwater level, HA is the upper limit of the stable groundwater level, and HB is the groundwater level. This is the lower limit of the stable water level. Pipe 5 is steel pipe section 5
A screener pipe formed by A and the net pipe portion 5B is used, the steel pipe portion 5A projects above the ground, and the net pipe portion 5B passes through the foundation K, root cutting bottom K1, and clay layer N, and the lower limit of stable groundwater level. It is built up to a certain depth below HB. A pump 6 is arranged at the bottom of the pipe 5, and a hose 6A connected to the pump 6 drains groundwater to the sewer of the ground surface GL. The amount of drainage is hose 6
It is adjusted by the valve 6B attached to A.
Further, the stable water level HL and its upper limit HA and lower limit HB are calculated by the state of the stratum, groundwater, etc. at the construction site.

In the deep well method, the pump 6
When the amount of drainage from the groundwater is small, the groundwater level becomes equal to or higher than the upper limit HA of the stable water level, and the whole foundation K is lifted by the pressure of the groundwater, so-called blister phenomenon occurs. It is likely to occur where there is a layer where it is difficult to pass groundwater, and when the amount of drainage from the pump 6 is large, the groundwater will be below the lower limit HB of the stable water level, and not only the foundation building site but also the surrounding ground will sink. A major accident may occur.

Therefore, in order to prevent such a serious accident, conventionally, an operator lowers a cord having a water level sensor attached at its tip into the pipe 5 until there is a reaction, and then pulls up the sensor to a reaction point. The groundwater level was measured by measuring the length of the cord, and the discharge amount was adjusted by the opening / closing degree of the valve 6B.

[0005]

However, the groundwater level is measured and adjusted several times a day.
In the above-mentioned conventional method, the worker has to repeat the above-mentioned work several times to obtain the average thereof in order to measure the reliable groundwater level, which is very troublesome. In particular, it was extremely difficult to measure and adjust groundwater frequently under typhoon and other weather conditions. Further, depending on the scale of the building to be built and the construction site, it is necessary to build a plurality of pipes 5 in different locations for drainage work. In such a case, work dedicated to the deep well method is required. Personnel had to be assigned, which resulted in a large labor cost. Further, even if a worker dedicated to the deep well method is arranged, it is difficult to monitor all the pipes 5 all day long, which may delay the discovery when the groundwater level is out of the stable water level. , I couldn't respond quickly and could lead to a big accident.

An object of the present invention is to solve the above-mentioned conventional drawbacks, to automatically confirm the stable water level of groundwater, and to control the drain valve quickly, and to manage the groundwater level in the deep well construction method. It is to provide a management device for that purpose.

[0007]

The groundwater level management method in the deepwell construction method according to the present invention is a deepwell construction method in which groundwater is pumped through a pipe built in the ground to adjust the water level. The upper limit sensor placed at the upper limit of the stable water level and the lower limit sensor placed at the lower limit of the stable water level detect the upper limit water level and the lower limit water level, and the electric signals from the respective sensors are taken out to the control panel for display or notification. , This display or notification content
A valve controller that controls the opening / closing degree of the valve
The valve control unit can be operated remotely by the operating unit provided on the control panel.
By doing so, the status of groundwater level is managed.

Further, the groundwater level control device in the deep well construction method according to the present invention comprises an upper limit sensor arranged at the upper limit of the stable water level, a lower limit sensor arranged at the lower limit of the stable water level, and the upper limit sensor and the lower limit sensor. A control panel for displaying or notifying the upper limit water level and the lower limit water level detected by the sensor, and a valve for controlling the amount of drainage are provided, and in the control panel, a stable water level lamp that lights up when the groundwater level is at a stable water level, An upper limit warning lamp that lights when the groundwater level is above the upper limit of the stable water level, a lower limit alarm lamp that lights up when the groundwater level is below the lower limit of the stable water level, and when the groundwater level is outside the stable water level. It has a buzzer that rings. When the groundwater level is at a stable water level, the drainage volume is kept constant, when the groundwater level is above the stable water level, the drainage volume is increased from the above stable water level, and when the groundwater level falls below the stable water level lower limit. Provides a valve controller for controlling the valve so that the drainage is stopped or the amount of drainage is reduced from the above-mentioned stable water level, and this valve controller is remotely operated by the operation unit provided on the management panel.

[0009]

[Operation] When the groundwater level is at a stable level, the stable level lamp on the control panel is lit, and it can be confirmed that the level is normal. When the stable water level exceeds the upper limit, it is detected by the upper limit sensor, the upper limit alarm lamp lights up, and the buzzer sounds. In this case, the controller controls the valve controller to increase the opening of the valve and increase the amount of drainage. When the groundwater level exceeds the lower limit of the stable water level, the lower limit sensor detects it and the lower limit alarm lamp lights up and the buzzer sounds. In this case, the pump is stopped or the valve opening by the valve controller is reduced to reduce the drainage amount.

[0010]

EXAMPLE An example of the groundwater level control method in the deep well method according to the present invention will be described together with the apparatus used for the execution. FIG. 1 is a schematic sectional view of an embodiment of a groundwater level management device according to the present invention, and FIG. 2 is a circuit diagram of a management board in FIG. The same components as those in the conventional example described with reference to FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 1, 1 is a stable water level H in the pipe 5.
An upper limit sensor arranged at the upper limit position of L, 2 is a pipe 5
It is a lower limit sensor arranged at the lower limit position of the stable water level HL inside, and is connected to the control panel 3 via the converter 4.
Here, the stable water level HL, its upper limit HA, and its lower limit HB are
As described above, it is calculated by the condition of the stratum, groundwater, etc. at the construction site. In this embodiment, for example, the position of 15 m from the surface GL is the stable water level HL.
And 1 m above and below the upper limit HA and the lower limit HB, respectively. In addition, the root cutting bottom K1 which is the bottom surface of the foundation K is 8 m from the ground surface GL, and the pipes having a diameter of 500 mm are arranged at both ends of the foundation K and are built from the ground surface GL to a point 21 m underground. . On the control panel 3, a stable water level lamp L1 that lights up when the groundwater level is at the stable water level HL,
The upper limit warning lamp L2 that lights when the groundwater level is equal to or higher than the upper limit HA of the stable water level, the lower limit alarm lamp L3 that lights when the groundwater level is equal to or lower than the lower limit HB of the stable water level, and the groundwater level is outside the stable water level. A buzzer BZ that sounds in some cases, a buzzer stop switch BZ1, and a power lamp L4 are provided. It should be noted that the stable water level lamp L1 is blue, the upper and lower limit alarm lamps L2 and L3 are red, and the power lamp L4 is yellow, so that they can be easily confirmed even in the dark. The management board 3 having such a configuration is
Usually, it is installed in a place away from the pipe 5 and the like, and is placed in a supervisory room where workers are always on standby. The valve 6B is opened / closed by a valve controller 6C that controls the opening thereof, and an operation unit 6D for remotely operating the valve controller 6C is provided on the management panel 3.

Next, an operation example of the circuit of the control board 3 will be described with reference to FIG. In FIG. 2, T1 is the upper limit sensor 1.
Switch, T2 is the lower limit sensor 2 switch, R1,
R2, R3 are relays, r1A, r1B, r1C are switches of the relay R1, r2A, r2B, r2C are relays R2
Switches, r3A and r3B are switches for relay R3,
BZ is a buzzer, and BZ1 is a buzzer stop switch. The management board 3 may be provided with a microprocessor CPU that automatically controls the valve controller 6C. In the above configuration, the operation will be described below according to the state of the groundwater level.

When the groundwater level is at the stable water level HL, the upper limit sensor 1 does not react and the lower limit sensor 2 reacts. Therefore, the switch T2 of the lower limit sensor 2 switches from the contact B to the contact A, and a current flows to the relay R2. Thereby, the switches r2A and r2 of the relay R2
B and r2C are switched from the contact B to the contact A, respectively.
At this time, since the upper limit sensor 1 is in a non-reactive state, no current flows through the relay R1 and the switches r1A, r1
B and r1C are all at contact point B. Therefore, + B power supply →
Stable water level lamp L1 → switch r2A → switch r1A
→ The grounding circuit is turned on and the stable water level lamp L1 lights up. In this state, no special control for the valve 6 is required.

When the groundwater level is equal to or higher than the upper limit HA of the stable water level, both the upper limit sensor 1 and the lower limit sensor 2 will react. Therefore, the switches T1 and T2 of the upper limit sensor 1 and the lower limit sensor 2 are switched from the contact B to the contact A,
A current flows through the relays R1 and R2. This makes the relay R
The switch r1A, r1B, r1C of No. 1 and the switches r2A, r2B, r2C of the relay R2 are switched from the contact B to the contact A, respectively. Therefore, the circuit of + B power supply → upper limit warning lamp L2 → switch r1B → ground is turned on, and the upper limit warning lamp L2 is turned on. Also, + B at the same time
Power → Buzzer BZ → Switch r3A → Switch r1C →
Since the earth is conducted, the buzzer BZ gives an alarm. The buzzer BZ sounds not only when the upper limit HA is equal to or higher than the lower limit HB described below. Therefore, not only the buzzer sound but also the lit lamp is the upper limit alarm lamp L2, that is, the groundwater level. Is equal to or higher than the upper limit HA of the stable water level, and the valve controller 6C controls the opening degree of the valve 6B so that the drainage amount increases from the stable water level.

After that, when the buzzer stop switch BZ1 composed of a non-lock type push button switch is turned on, + B power source → relay R3 → buzzer stop switch BZ1 → switch r1C → ground is conducted, and relay R3
The switch r3A is switched from the contact B to the contact A, so that the buzzer BZ stops. At the same time, the switch r3B of the relay R3 switches from the contact B to the contact A,
Even after the buzzer stop switch BZ1 returns to off, +
B power supply → relay R3 → switch r3B → switch r1C
→ The ground is conducted, the switch r3A of the relay R3 remains switched from the contact B to the contact A, and the line to the buzzer BZ remains blocked. However, when the drainage by the pump 6 progresses and the groundwater level returns to the stable water level HL, the upper limit sensor 1 does not react and the lower limit sensor 2 reacts, so that current flows only through the relay R2, The switch r1C of the relay R1 is switched from the contact A to the contact B, the line to the relay R3 is cut off, and the switches r3A and r3B of the relay R3 are switched from the contact A to the contact B.
And the buzzer stop switch contact BZ1 is reset to the state before being turned on.

When the groundwater level is below the lower limit HB of the stable water level, both the upper limit sensor 1 and the lower limit sensor 2 do not react. Therefore, the upper limit sensor 1 and the lower limit sensor 2
Since the switches T1 and T2 of the above are still the contacts B, no current flows through the relays R1 and R2. Therefore, the switch r
Since 1A, r1B, r1C, r2A, r2B, and r2C remain as contacts B, + B power supply → lower limit alarm lamp L3 →
Switch r2A → ground is conductive, lower limit alarm lamp L3
Lights up. At the same time, the + B power source → buzzer BZ → switch r3A → switch r2C → ground is conducted, and the buzzer BZ sounds. In this case, the lower limit alarm lamp L3 is turned on, that is, the groundwater level is the lower limit HB of the stable water level.
Checking that the following is satisfied, the pump 6 is stopped or the valve 6B is controlled by the valve controller 6C so that the discharge amount of the pump 6 becomes smaller than that at the stable water level. After that, the buzzer stop switch BZ1 is reset in the same manner as in the above case.

Although the three modes have been described above, since two pipes are arranged in this embodiment, two circuits of the above-mentioned circuit of FIG. 2 are arranged on the management board 3 in correspondence with the number of pipes. There is. Further, in the embodiment, the opening and closing of the valve 6 is remotely controlled by the operation unit 6D by using the valve controller 6C, but it goes without saying that it can be manually operated on site. Further, as shown by the dotted line in FIG. 2, signals from the stable water level lamp L1, the upper limit and lower limit alarm lamps L2 and L3 are controlled by a control circuit (for example, a microprocessor).
It is also possible to input the data to the CPU and automatically control the valve controller 6C by the control circuit CPU.

[0017]

According to the method for controlling groundwater level in the deep well construction method according to the present invention, not only when the groundwater is at a stable water level, but also when the upper limit of the stable water level is exceeded and when the lower limit of the stable water level is exceeded, A lamp or buzzer placed on the control panel automatically displays or informs you, so you can quickly stop drainage and adjust the valve opening according to the mode, and prevent blister phenomenon or ground subsidence. Accidents can be prevented. In addition, valve operation is performed by operating the valve controller remotely from the operation unit provided on the control panel, so frequent measurement and valve operation that are required to go to the site as in the past are not required, which is extremely labor-saving. It is possible to prevent the risk of a typhoon and the like. According to the groundwater level management device in the deep well construction method according to the present invention, the structure is simple and can be installed without requiring a large amount of equipment cost, and moreover, the groundwater level can be accurately and surely known. Control can be performed quickly and appropriately. Furthermore, the valve opening / closing degree is adjusted by a valve controller, which keeps the drainage volume constant when the groundwater level is at a stable water level, and increases the drainage volume from the above stable water level when the groundwater level is above the stable water level upper limit. Then, when the groundwater level becomes lower than the lower limit of the stable water level, the drainage is stopped or the valve controller can be operated by remote control so that the drainage amount is reduced from the stable water level.

[0018]

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a groundwater level management device in a deep well construction method according to the present invention.

FIG. 2 is a circuit diagram of a management board in FIG.

FIG. 3 is a schematic cross-sectional view for explaining a conventional deep well method.

FIG. 4 is a perspective view showing the pipe in FIG.

[Explanation of symbols]

 1 Upper limit sensor 2 Lower limit sensor 3 Control panel 4 Converter 5 Pipe 6 Pump 6A Hose 6B Valve 6C Valve controller 6D Operation part L1 Stable water level lamp L2 Upper limit alarm lamp L3 Lower limit alarm lamp BZ buzzer BZ1 Buzzer stop switch HL Stable water level HA Stable Upper limit of water level HB Lower limit of stable water level R1 relay R2 relay R3 relay

Claims (3)

[Claims] 1. In a deep well construction method in which groundwater is pumped up by a pump (6) through a pipe (5) built in the ground to adjust the water level, an upper limit (HA) of a stable groundwater level (HL) is set. Placed upper limit sensor (1) and lower limit (HB) of stable water level (HL)
The upper limit water level and the lower limit water level are detected by the lower limit sensor (2) arranged in the, and the electric signals from the respective sensors (1, 2) are taken out to the management board (3) to be displayed or notified , and this display or notification is given. Depending on the content of the valve (6B)
Management board with a valve controller (6C) that controls the degree of opening and closing
Remotely control the valve controller (6C) with the operating unit (6D)
A groundwater level management method in the deep well construction method, characterized by managing the status of the groundwater level by operating . 2. A groundwater level control device for use in a deep well construction method, in which a pump (6) pumps groundwater through a pipe (5) built in the ground to adjust the water level. The upper limit sensor (1) arranged at the upper limit (HA) of (HL) and the lower limit (H) of the stable water level (HL).
A lower limit sensor (2) arranged in B), and a control panel (3) for displaying or notifying the upper limit water level and the lower limit water level detected by the upper limit sensor (1) and the lower limit sensor (2),
A valve (6B) for controlling the amount of drainage is provided, and the control panel (3) has a stable water level lamp (L1) that lights up when the groundwater level is at the stable water level (HL) and an upper limit of the stable water level at the groundwater level. Upper limit alarm lamp (L2) that lights when (HA) or higher, lower limit alarm lamp (L3) that lights when the groundwater level becomes lower than the lower limit (HB) of the stable water level, and groundwater level outside the stable water level Buzzer (B
Z) is provided, and the groundwater level management device in the deep well construction method. 3. When the groundwater level is at a stable water level, the amount of drainage is kept constant, and when the groundwater level is at or above the upper limit (HL) of the stable water level, the amount of drainage is increased from the above-mentioned stable water level so that the groundwater level becomes stable. When it becomes lower than the lower limit (HB) of the valve, the valve controller (6) which controls the valve (6B) so as to stop the drainage or reduce the drainage amount from the above stable water level.
C) is provided, and the operation unit (6D) provided on the control panel (3)
3. The groundwater level management device in the deep well construction method according to claim 2, wherein the valve controller (6C) is remotely controlled by.