JPH0953933A - Communication tube type subsidence meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a communication tube type subsidence meter in which zero drift can be determined through a simple structure. SOLUTION: The communication tube type subsidence meter comprises a reference water tank 1 including a mechanism 16 for sustaining a constant water level and a circulation water tank 12 disposed at a reference position, and a detection water tank 2 equipped with a water pressure gauge 22 for detecting the subsidence of a measuring position by variation of water level. A communication tube 3 is disposed between the reference water tank 1 and the detection water tank 2. The detection water tank 2 is divided into the upper part serving as a water level varying part 7 and the lower part partitioned into a water storage section 24 for housing a water pressure gauge 22 and a water supply/discharge section 25 having a port 26 opening to the communication tube 3 by a partition means 23 for sustaining a constant water level in the water storage section 24. An opening/closing drainage means 17 drains the water from the water supply/discharge section 25 of detection water tank 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication tube type subsidence meter for measuring the amount of subsidence of a structure or the surface of a ground by changing the water level.

[0002]

2. Description of the Related Art Conventionally, a method of detecting the subsidence amount of a structure or ground surface by detecting the relative subsidence amount of a plurality of measuring points with respect to a reference point by changing the water level and detecting the fluctuation of the float is performed. ing. In recent years, the method of measuring the water level with a water pressure gauge has been increasing, taking advantage of the advantage that no moving parts are required. This type of sinking amount measuring device is called a so-called communicating pipe type settlement meter, and as shown in FIG. 6, it is known to include a reference water tank 50, a detection water tank group 60, and a communicating pipe 70.

The reference water tank 50 is composed of a water tank body 51, a circulating water retention tank 52 and a pump 53, and the circulation pipe 5
It is connected by 4,55. A drainage pipe 56 is provided in the water tank body 51 with an upper opening located at a certain height, and a communication port opening to the communication pipe 70 is provided in the lower part. Pump 5
Even if the water is supplied into the water tank main body 51 by the method 3 and the water is supplied from the reference water tank 50 to the detection water tank group 60, the water level of the reference water tank 50 is kept constant. Further, when the water returns from the detection water tank group 60 or the supply from the pump 53 becomes excessive, the excess water overflows from the upper opening to keep the water level constant.

The detection water tank group 60 includes a plurality of detection water tanks 60a,
60b, 60c, each detection water tank 60a, 60b,
Each of the lower portions 60c is connected to the communication pipe 70 and communicates with the reference water tank 50. Each detection water tank 60a, 60b, 6
0c has water pressure gauges 61a, 61b, 61c, respectively. Further, the upper portions of the respective detection water tanks 60a, 60b, 60c are communicated with a gas communication pipe 71 so that the pressure applied to the water surface of each water tank by the gas such as air is the same in each detection water tank. As shown in FIG. 7, the measured values of the water level detected by the water pressure gauges 61a, 61b, 61c are recorded in the personal computer 65 via the scanning box 62, the amplifier 63, and the A / D converter 64. ing.

When the measurement point sinks, the reference water tank 5
Water is supplied from 0, the water level in the detection water tank rises, and the pressure is detected by the water pressure gauge. The water level of the reference water tank 50 is kept constant by supplying water from the pump 53. On the contrary, when the measurement point relatively rises, the water returns to the reference water tank 50, and the pressure is reduced by the water pressure gauge to be detected. In this case, the water level of the reference water tank 50 overflows from the upper opening of the drainage pipe 56 to keep the water level constant.

[0006]

As described above, in the water pressure gauge used as the water level detection sensor, so-called zero drift occurs in which the output changes with time without load.
Therefore, in order to obtain the measured value of the water pressure gauge corresponding to the true water level (head), it is necessary to correct the error due to zero drift. In this case, in the conventional subsidence gauge, all the water in the detection water tank is discharged, the water pressure gauge is read, and zero drift is confirmed.

However, the detection water tank is equipped with a large number in a general use state, and there is a practical problem that it requires a great deal of labor to drain each of them and to modify them. Therefore, the water in the detection water tank is not normally discharged, and the error due to zero drift is not corrected. Also, when the water pressure gauge is corrected by discharging all water to zero and the water pressure gauge is touched by air, the accuracy and durability of the water pressure gauge may be adversely affected by temperature and other factors. . Furthermore, when all the water is discharged, air bubbles will enter and it will be necessary to readjust the entire system.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the conventional problems and provide a communicating tube type subsidence device having a simple structure and capable of confirming a zero drift value.

[0009]

The communication tube type subsidence meter of the present invention as a means for achieving the above object comprises a mechanism which is installed at a reference position and which maintains a constant water level in a water tank and a circulating water retention tank. It is a communication pipe type subsidence meter consisting of a reference water tank and a detection water tank equipped with a water pressure gauge that detects the amount of subsidence at the measurement site based on the amount of change in water level, and a communication pipe that connects the reference water tank and the detection water tank is provided. The measurement water level fluctuation part is provided in the upper part of the detection water tank, and the water storage part accommodating the water pressure gauge and the water supply / drainage part having a communication pipe opening that opens to the communication pipe are partitioned by a partitioning means that keeps the water level of the water storage part constant. It is characterized in that it is provided with an openable / closable drainage means for discharging water communicating with the water supply / drainage section of the detection water tank.

In the communication tube type settlement device, when installed in a prefabricated or designed device, the detection water tank is connected to a first tank having a water reservoir for accommodating a water pressure gauge, and a communication tube communicating with a reference water tank. It is preferable that the water supply / drainage section with a mouth and the water storage section are configured by partitioning means to form a second tank, and a communication section that connects both tanks and that connects the two water storage sections. Further, in the communication tube type subsidence meter, in order to unify the efficiency of water supply and drainage, the detection water tank is partitioned by a partitioning means for maintaining a constant water level, a water storage section for accommodating a water pressure gauge, and a water supply and drainage section having a communication pipe port. It is preferable that the drainage means is connected to the reference water tank.

The reference water tank includes a water tank body, a circulating water holding tank, a pump, and the like, and a mechanism for keeping the water level of the water tank constant is composed of an overflow member, a pump, and the like. The detection water tank includes a tank body, a water pressure gauge, a water storage section, and a water supply / drainage section, and has a partition member for maintaining the water level of the water storage section.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A continuous pipe subsidence meter according to the present invention comprises a reference water tank installed at a reference position, detection water tanks respectively installed in a plurality of measuring sections, and a communication pipe for connecting these water tanks. It consists of a water pressure gauge that detects changes in the vertical direction of the measurement part (subsidence amount) by changes in the water head. The reference water tank is equipped with a circulating water storage tank that stores water and a mechanism that consists of a pump, an overflow pipe, etc. that keeps the water level of the water tank constant, and is installed on the reference building or ground to maintain the reference position. I have to.

The change in the vertical direction of the measuring unit is changed by the water head by connecting the reference water tank and the detection water tank by a communication pipe and keeping the water levels of both water tanks constant in conjunction with each other. This is measured as a change in water pressure with a water pressure gauge in the detection water tank. The upper part of the detection water tank is the measurement water level fluctuation part, and the lower part is partitioned by a partition that keeps the water level of the water tank constant or by a partition member such as an overflow wall. It is divided into compartments (water supply / drainage section) that have a communication pipe opening that opens to the communication pipe. This partition member is used as a partition means for maintaining the water level in the water storage part of the detection water tank at a predetermined water level (head).

Further, when checking the zero drift,
An openable and drainable means for discharging water from the detection tank other than the compartment accommodating the water pressure gauge is provided so as to keep the head of water acting on the water pressure gauge constant. This drainage means is connected to the reference water tank to discharge the water of all the detection water tanks at one place, or is provided for each detection water tank and drained for each detection water tank, or provided for every several detection water tanks. Therefore, it is necessary to drain each of several detection tanks.

In order to measure the amount of subsidence, the reference water tank and the detection water tank are connected by a communication pipe, the water level of the reference water tank is kept constant, and the water pressure gauges of the detection water tanks respectively installed in the plurality of measuring sections are connected. To measure the water pressure respectively. The value corresponding to the amount of change in water pressure is measured as the amount of subsidence.
Further, in order to check the zero drift, the drainage means that can be freely opened and closed is opened to discharge water from the detection water tank, and the water level on the water pressure gauge is set to a predetermined constant water level by the water level maintenance mechanism. Check the zero drift by comparing the water head determined by the height of the partition with the detection value measured by the water pressure gauge. The zero drift can be corrected by correcting the error between the water pressure and the water head.

Further, in the communication tube type subsidence meter, the drainage means is provided in a reference water tank, and the detection water tank is partitioned by a partition means for maintaining a predetermined water level, and there is a water storage section for accommodating a water pressure gauge and a communication pipe port. If it is composed of a water supply and drainage section,
The squat gauge can be corrected for zero drift with a simple structure. Furthermore, since the water levels in all the detection water tanks can be made constant by operating and draining at one place, the work of zero drift check can be performed easily in a centralized place, reducing labor. You can

Further, in the above-mentioned communication pipe type subsidence meter, a first tank having a water storage part for accommodating a water pressure gauge, and a second tank having a water supply / drainage part having a communication pipe port communicating with a reference water tank and a water storage part From the detection water tank, and the communication part that connects both chambers,
According to the configuration including the partitioning means for maintaining the water level applied to the water pressure gauge at a predetermined value, it is possible to correct the zero drift of the ready-made subsidence gauge with a simple structure. Also, a mechanism for checking zero drift can be easily added to the existing detection water tank.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of an embodiment of a communication tube type settlement gauge according to the present invention. The continuous pipe subsidence meter of this embodiment is a reference water tank 1 installed at a reference position.
And a detection water tank 2 installed in each of the plurality of measurement units,
It is composed of a communication pipe 3 which communicates these water tanks, and a water pressure gauge 22 provided in each detection water tank 2 which detects a relative change in the measuring section by a change in water level. The detection water tank 2 is provided with partitioning means (partitioning member) 23 for holding the water level of the detection water tank 2 at a predetermined value.
It is provided with drainage means 17 which is openable and closable and discharges water outside the partition member 23.

The reference water tank 1 includes a water tank body 11, a circulating water retention tank 12 for storing water, a pump 13 for sending the stored water into the water tank body 11, and a supply pipe 15 with the pump 13 interposed. And an overflow pipe 16 for keeping the water level in the water tank body 11 constant.

The upper portion of the water tank body 11 and the circulating water retention tank 12
And a supply pipe 15 with a pump 13 interposed therebetween. Further, the lower portion of the overflow pipe 16 is opened to the circulation water retention tank 12, and the upper portion is opened to a predetermined height so that the water tank body 1
The inside of 1 and the circulation water retention tank 12 are connected. And
When the water level in the water tank body 11 rises, it overflows and drains to the circulating water retention tank 12 to keep the water level at a constant La, and when the water level drops, water is supplied from the pump 13 to raise the water level to a constant La. Hold.

A drainage means (valve) 17 which can be opened and closed freely.
Circulating water retention tank 12 and water tank body 1 with drain pipe 14 having
1 is communicated with the lower portion of the water tank 1, and the drainage means 17 is opened so that the water level in the water tank body 11 can be lowered to Lb. Then, the pump 13 is stopped to stop the water supply, and the drainage means 17 is closed to adjust the water level in the water tank body 11 to Lb.
To hold.

The bottom of the reference water tank 1 and a plurality of detection water tanks 2, 2
The bottom portion of the water tank 1 is communicated with a communication pipe 3, and the upper portions of the water tanks 1 and 2 are communicated with an air pipe 4 respectively. Each detection water tank 2 comprises a tank body 21 and a water pressure gauge 22.
The inside of the tank main body 21 is divided into a measured water level fluctuation section 7 at the upper part and a partition member 23 as a partition means at the lower part to form a water pressure gauge 2
It is composed of a water storage section 24 for accommodating 2 and a water supply / drainage section 25 having a communication pipe port 26. The tank main body 21 is formed in a tubular shape so as to be downsized and the water level can be changed over a wide range.

To measure the subsidence of the measuring section, the communication pipe 3
Further, the reference water tank 1 and the detection water tanks 2 and 2 are communicated with each other by the air pipe 4, the drainage means 17 is closed, and the pump 13 is operated to supply water from the circulation water retention tank 12 to the water tank body 11. The water levels (water surfaces) of the water tank main body 11 and the tank main body 21 are held at La, which is the range of the measured water level fluctuation unit 7. In this case, when the tank body 21 of the detection water tank sinks, the depth (head) from the water surface to the water pressure gauge 22 increases and the water pressure increases, and the amount of subsidence can be measured by a change in the water pressure.

FIG. 2 is a view showing another example of the detection water tank of the communication tube type subsidence meter. The detection water tank 5 of the present embodiment has a first tank 33 having a water storage portion 31a provided with a water pressure gauge 32, a water supply / drainage portion 38 having a communication pipe port 36 communicating with the reference water tank, and a water storage portion 31b. Composed of a tank 39 and a communication part 3
5, the water storage parts 31a and 31b are connected to each other, and the water supply / drainage part 33 is provided with partition means 34 for maintaining the water level at a predetermined value. The first tank 33 and the second tank 39 are formed in a cylindrical shape so that they can be downsized and the water level can be changed over a wide range.

The partition means 34 is formed from a tubular member at a certain height, and is provided so as to surround the periphery of the communication pipe port 36 provided at the bottom of the second tank 39. According to this configuration,
Second tank 39 provided with partitioning means 34 in the conventional detection water tank
It is possible to form the communication tube type settlement gauge of the present invention by connecting the. Then, it becomes possible to correct the zero drift, and it is possible to obtain an accurate measurement value of the squat amount.

FIG. 3 is a view showing still another example of the detection water tank. The detection water tank 6 of the present embodiment is different from the example of FIG. 2 in partitioning means, but other parts can be formed in the same manner, and therefore, the same components will be denoted by the same reference numerals and detailed description thereof will be omitted.
The partition means 37 is formed at a certain height from the plate-shaped member, and is provided so as to partition the communication pipe port 36 and the communication portion 35 provided at the bottom of the second tank 39. With this configuration as well, by connecting the second tank 39 provided with the partition means 37 to the conventional detection water tank, it is possible to form the communicating tube type subsidence meter of the present invention and obtain the same effect. .

It should be noted that although the above embodiment does not describe the provision of the air pipe or the air vent, they are provided so that the pressure acting on the water pressure gauge by the gas such as air becomes constant at any portion. Of course. When the action of gas is atmospheric pressure, a reference water tank,
Of course, the communication pipe or the detection water tank may be opened. Besides, the present invention is not limited to the above-mentioned embodiments, and includes configurations that can be modified and implemented within the scope not changing the gist of the present invention. For example, drainage means may be provided for each required detection water tank as shown in FIG.

FIG. 4 is a view showing the structure of the detection water tank of the communication tube type subsidence meter. In the example of this figure, the same parts as those in the above-mentioned embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. The detection water tank 5 of the present embodiment has a first tank 33 having a water storage portion 31a provided with a water pressure gauge 32, and a communication pipe port 36 communicating with the reference water tank.
Second tank 3 having water supply / drainage section 38 and water storage section 31b
9, the water storage portions 31a and 31b are connected to each other by the communication portion 35, and the second tank 39 is provided with partition means 37 for maintaining the water level at a predetermined value. And the water supply / drainage unit 3
A connecting portion 41 communicating from 8 to the communicating pipe 3 is provided with a discharge means 42 that can be opened and closed. By switching the drainage means (discharging means) 42, the stored water in the water supply / drainage section 38 is drained to the drainage pipe 43.

The discharging means 42 is composed of, for example, a three-way valve,
The drainage pipe 43 can be opened and closed in the direction of the communication pipe 3
It can be opened and closed with. Then, when the zero drift is corrected, the discharge means 42 blocks the communication between the water supply / drainage unit 38 and the communication pipe 3, opens the water discharge pipe 43, and discharges the water in the water supply / drainage unit 38. Water storage section 31a. The water level of 31b is held at the height of the partitioning means 34, and the zero pressure can be known from the water pressure with respect to this known height and its measured value, and from this, the constantly measured value is corrected. According to the example of FIG. 4, since the zero drift can be individually corrected by the detection water tank provided with the partitioning means 34, it is possible to accurately measure the subsidence amount only at a necessary measurement site.

FIG. 5 is a view showing another example of a one-tank type detection water tank different from the types of the communication tube type subsidence meter shown in FIGS. 2 and 3. The detection water tank 2 of the present embodiment has a water storage section 24 and a water supply / drainage section 25 formed by partitioning means 23 at the end edge of the communication pipe port 26 provided at a position higher than the position of the water pressure gauge 22.
Even with this configuration, the water level in the water storage section 24 is equal to that of the partition means 2.
It is held at a height of 3, and as before, the water pressure for a known height and the zero drift can be known from the measured value.
Since the partition means has a very simple structure, it is effective in terms of cost. The same parts as those in the embodiment according to FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

[0031]

As is clear from the above description, according to the communication tube type settlement device of the present invention, the zero drift can be surely checked by a simple operation, only by adding a simple structure at the time of manufacturing. According to the communication tube type settlement device of the second aspect, the system device can be easily added by using the conventional device as it is, and the zero drift can be checked by a simple operation. Further, according to the continuous pipe subsidence meter of claim 3, since the detection water tank is partitioned by the partition member, a plurality of detection water tanks can be simultaneously acted on by a fixed head from one point on the reference water tank side. You can The drainage means of the communication tube type subsidence device can be made a simple structure, and the zero drift can be checked by a simple operation.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of an embodiment of a communication tube type settlement gauge of the present invention.

FIG. 2 is an explanatory diagram showing a part of the configuration of another embodiment of the communication tube type settlement device.

FIG. 3 is an explanatory diagram showing a part of the configuration of still another embodiment.

FIG. 4 is an explanatory diagram showing a part of the configuration of still another embodiment.

FIG. 5 is an explanatory diagram showing a part of the configuration of another embodiment of the one-tank type.

FIG. 6 is an explanatory diagram showing a configuration of a conventional communication tube type squat meter.

FIG. 7 is a block diagram showing an apparatus for measuring the amount of subsidence using a communication tube type subsidence meter.

[Explanation of symbols]

 1 Reference water tank 2, 5, 6 Detection water tank 3 Communication pipe 4 Air pipe 7 Measurement water level fluctuation part 11 Water tank body 12 Circulating water retention tank 13 Pump 14 Drain pipe 15 Supply pipe 16 Overflow pipe 17 Drainage means 21 Tank body 22, 32 Water pressure gauge 23, 34, 37 partitioning means (member) 24, 31a. 31b Water storage part 25,38 Water supply / drainage part 26,36 Communication pipe port 33 First tank 39 Second tank

Claims (3)

[Claims] 1. A detection provided with a reference water tank installed at a reference position, comprising a mechanism for maintaining a constant water level in the water tank and a circulating water retention tank, and a water pressure gauge for detecting the amount of subsidence at a measurement site based on the amount of change in the water level. It is a communication tube type settlement gauge consisting of a water tank,
A communication pipe that connects the reference water tank and the detection water tank is provided, and the upper part of the detection water tank is a measured water level fluctuation part, and the lower part is a water storage part accommodating the water pressure gauge and a water supply / drainage part having a communication pipe opening opened to the communication pipe. The water storage part and the water supply / drainage part are partitioned and formed by partitioning means for keeping the water level of the water storage part constant, and an openable / closable drainage device for discharging water communicating with the water supply / drainage part of the detection water tank is provided. Communication tube type settlement gauge. 2. A first tank having an independent water storage part for accommodating a water pressure gauge, a water supply / drainage part having a communication pipe port communicating with a reference water tank, and a water storage part, which are formed by partitioning means. The communication tube type subsidence meter according to claim 1 or 2, comprising a second tank and a communication section that connects both tanks and communicates both water storage sections. 3. The communication tube type settlement gauge according to claim 1, wherein the drainage means is connected to a reference water tank.