JP3680087B2 - Communication pipe settlement meter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication pipe type subsidence meter for measuring the amount of subsidence on a structure or ground surface by changing the water level.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a method of detecting the amount of settlement on a structure or ground surface by detecting the change in float by replacing the relative amount of settlement at a plurality of measurement points with respect to a reference point with a change in water level. In recent years, taking advantage of the advantage of not requiring moving parts, there are many methods for measuring the water level with a hydrometer. This type of subsidence measuring device is called a so-called communication tube type subsidence meter, and as shown in FIG. 6, a device comprising a reference water tank 50, a detection water tank group 60 and a communication pipe 70 is known.
[0003]
The reference water tank 50 includes a water tank main body 51, a circulating water retention tank 52, and a pump 53, which are sequentially communicated by circulation pipes 54 and 55. A drain pipe 56 is provided in the water tank main body 51 with the upper opening positioned at a certain height, and a communication port opened in the communication pipe 70 is provided in the lower part. Even if water is supplied into the water tank main body 51 by the pump 53 and 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. Moreover, when water returns from the detection water tank group 60 or supply from the pump 53 becomes excessive, excess water overflows from the upper opening to keep the water level constant.
[0004]
The detection water tank group 60 includes a plurality of detection water tanks 60 a, 60 b, 60 c, and each detection water tank 60 a, 60 b, 60 c is connected to the communication pipe 70 at the lower part and communicates with the reference water tank 50. Each detection water tank 60a, 60b, 60c has water pressure gauges 61a, 61b, 61c, respectively. Moreover, the upper part of each detection water tank 60a, 60b, 60c is connected to the gas communication pipe 71, and the pressure added to the water surface of each water tank by gas, such as air, is made the same in each detection water tank.
The measured values of the water levels 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 as shown in FIG. ing.
[0005]
And if a measurement point sinks, water will be supplied from the reference water tank 50, the water level of a detection water tank will go up, and a pressure will be increased and detected by a water pressure gauge. The water level in the reference water tank 50 is kept constant by supplying water from the pump 53. Conversely, when the measurement point rises relatively, water returns to the reference water tank 50, and the pressure is detected by the water pressure gauge. In this case, the water level of the reference water tank 50 is kept constant as the water overflows from the upper opening of the drain pipe 56.
[0006]
[Problems to be solved by the invention]
As described above, the water pressure gauge used as the water level detection sensor generates a so-called zero drift in which the output at no load changes with time. Therefore, it is necessary to correct an error due to zero drift in order to obtain a measurement value of the water pressure gauge corresponding to the true water level (water head). In this case, the conventional subsidence meter takes a method of discharging all the water in the detection water tank, reading the water pressure gauge, and confirming zero drift.
[0007]
However, there are a large number of detection water tanks in a general use state, and there has been a practical problem that draining and modifying each of them requires a lot of labor. Therefore, the water in the detection water tank is not normally discharged, and the error due to zero drift is not corrected.
Also, when correcting the water pressure gauge by draining all water and making the water level zero, if the water pressure gauge's detector touches the air, it may be affected by temperature and other factors, which may adversely affect accuracy and durability. . Furthermore, when all the water is discharged, air bubbles enter and it is necessary to readjust the entire system.
[0008]
An object of the present invention is to solve the conventional problems and to provide a communication pipe type subsidence meter which has a simple structure and can confirm a zero drift value.
[0009]
[Means for Solving the Problems]
The communication pipe type subsidence meter of the present invention as a means for achieving the above object is a reference water tank, which is installed at a reference position and is composed of a mechanism for keeping the water level of the water tank constant and a circulating water holding tank, and the subsidence of the measurement site It is a communication pipe type subsidence meter consisting of a detection water tank equipped with a water pressure gauge that detects the amount by the amount of change in the water level, provided with a communication pipe that connects the reference water tank and the detection water tank, and the measurement water level above the detection water tank The fluctuating part is divided into a water storage part containing a water pressure gauge at the lower part and a water supply / drainage part having a communication pipe opening that opens to the communication pipe with partition means that keeps the water level of the water storage part constant. An openable / closable drainage means for discharging the communicating water is provided.
[0010]
In the communication pipe type subsidence meter, when it is installed in an already manufactured or already designed device, the detection water tank has a first tank having a water storage section for accommodating a water pressure gauge, and a communication pipe port communicating with the reference water tank. It is preferable to configure a second tank formed by partitioning the water supply / drainage section and the water storage section with a partitioning means, and a communication section that connects both the tanks and communicates the two water storage sections.
Further, in the communication pipe type subsidence meter, in order to improve the efficiency of centralized supply and drainage, the detection water tank is partitioned by a partitioning means for maintaining a constant water level, a water storage unit for storing the water pressure gauge, and a water supply and drainage unit having a communication pipe port It is preferable to divide the drainage means into a reference water tank.
[0011]
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 includes an overflow member, a pump, and the like.
The detection water tank includes a tank body, a water pressure gauge, a water storage part, and a water supply / drainage part, and has a partition member for maintaining the water level of the water storage part.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The communication pipe type subsidence meter of the present invention includes a reference water tank installed at a reference position, a detection water tank installed in each of a plurality of measurement units, a communication pipe communicating these water tanks, and a change in the vertical direction of the measurement unit. It consists of a water pressure gauge that detects the amount of subsidence by changing the head.
The reference water tank is equipped with a circulating water 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 in the reference building or ground to maintain the reference position. I have to.
[0013]
The change in the vertical direction of the measurement unit is changed at the head of water by connecting the reference water tank and the detection water tank with 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 by 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 member that keeps the water level of the water tank constant or a partition member such as an overflow wall, and communicates with the compartment (water storage part) that contains the water pressure gauge and the reference water tank It divides into the division (water supply / drainage part) which has the communication pipe port opened to the communication pipe which does. This partition member is used as partition means for maintaining the water level of the water storage section of the detection water tank at a predetermined water level (water head).
[0014]
Further, when checking for zero drift, an openable and closable drainage means for draining water from a detection tank other than the section accommodating the water pressure gauge is provided so as to keep the water head acting on the water pressure gauge constant. This drainage means is connected to the reference water tank to discharge the water from all the detection water tanks at one place, or provided for each detection water tank and drained for each detection water tank, or provided for every several detection water tanks. So that every few detection tanks are drained.
[0015]
Then, in order to measure the amount of settlement, 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 is detected by the water pressure gauges of the detection water tanks respectively installed in a plurality of measurement units. Measure each. The value corresponding to the amount of change in water pressure is measured as the amount of sinking.
In order to check for zero drift, the openable drainage means is opened to discharge water from the detection water tank, and the water level applied to the water pressure gauge is set to a predetermined constant water level by the water level maintenance mechanism. Zero drift is checked 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 of the water pressure with the head.
[0016]
Further, in the communication pipe type settlement gauge, the drainage means is provided in a reference water tank, partitioned by a partition means for maintaining the inside of the detection water tank at a predetermined water level, a water storage section for storing a water pressure gauge, and a water supply / drainage section having a communication pipe port; If the structure is made of, the zero drift can be corrected with a simple structure for the settlement meter. Furthermore, since the water level of all the detection water tanks can be made constant by operating and draining at one location, the zero drift check work can be easily concentrated in one place, reducing labor. Can do.
[0017]
Further, in the communication pipe type subsidence meter, a detection water tank is formed from a first tank having a water storage section for accommodating a water pressure gauge, a water supply / drainage section having a communication pipe port communicating with a reference water tank, and a second tank having a water storage section. In accordance with the configuration comprising a communication part that communicates both chambers and a partition means that maintains the water level loaded on the water pressure gauge at a predetermined value, a ready-made subsidometer can be corrected with a simple structure. can do. In addition, a mechanism for checking zero drift can be easily added to the existing detection tank.
[0018]
【Example】
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of an embodiment of a communication pipe type settlement meter according to the present invention.
The communication pipe type subsidence meter of the present embodiment includes a reference water tank 1 installed at a reference position, a detection water tank 2 installed in each of a plurality of measurement units, a communication pipe 3 communicating these water tanks, and a measurement unit It consists of the water pressure gauge 22 provided in each detection water tank 2 which detects a relative change by the change of a water level. A partition means (partition member) 23 for holding the water level of the detection water tank 2 at a predetermined value is provided, and an openable / closable drain means 17 for discharging water outside the partition member 23 of the detection water tank 2 is provided.
[0019]
The reference water tank 1 includes a water tank body 11, a circulating water retention tank 12 that stores water, a pump 13 that sends the stored water into the water tank body 11, a supply pipe 15 that interposes the pump 13, and a water tank. And an overflow pipe 16 for keeping the water level in the main body 11 constant.
[0020]
The upper part of the water tank main body 11 and the circulating water retention tank 12 communicate with each other through a supply pipe 15 with a pump 13 interposed therebetween. Further, the lower part of the overflow pipe 16 opens to the circulating water holding tank 12 and the upper part opens to a predetermined height so as to connect the inside of the water tank body 11 and the circulating water holding tank 12. 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. When the water level drops, water is supplied from the pump 13 to raise the water level to a certain level. Hold at La.
[0021]
Further, the drainage pipe 14 having an openable / closable drainage means (valve) 17 connects the circulating water retention tank 12 and the lower part of the water tank body 11 to open the water drainage means 17 to lower the water level in the water tank body 11 to Lb. To be able to. Then, the pump 13 is stopped to stop the supply of water, and the drainage means 17 is closed to keep the water level in the water tank body 11 at Lb.
[0022]
The bottom of the reference water tank 1 and the bottoms of the plurality of detection water tanks 2 and 2 are communicated with each other by a communication pipe 3, and the upper and upper parts of each of the water tanks 1 and 2 are communicated by an air pipe 4.
Each detection water tank 2 includes a tank body 21 and a water pressure gauge 22. The inside of the tank main body 21 is composed of an upper measurement water level fluctuation part 7, a water storage part 24 that houses a water pressure gauge 22 partitioned by a partition member 23 that is a lower partitioning means, and a water supply / drainage part 25 having a communication pipe 26. Is done.
The tank body 21 is formed in a cylindrical shape so that the water level can be changed in a wide range while reducing the size.
[0023]
In order to measure the amount of subsidence of the measuring unit, the reference water tank 1 and the detection water tanks 2 and 2 are connected with each other by the communication pipe 3 and the air pipe 4, the drainage means 17 is closed, the pump 13 is operated, and the circulation water holding tank 12 Water is supplied to the water tank body 11. The water level (water surface) of the water tank main body 11 and the water tank main body 21 is held at La which is the range of the measured water level fluctuation part 7. In this case, when the tank body 21 of the detection water tank sinks, the depth (water head) from the water surface to the water pressure gauge 22 increases, the water pressure increases, and the amount of settlement can be measured by the change in water pressure.
[0024]
FIG. 2 is a diagram showing another example of the detection water tank of the communication pipe type settlement meter.
The detection water tank 5 of the present embodiment has a first tank 33 having a water storage part 31a provided with a water pressure gauge 32, and a second water supply / drainage part 38 having a communication pipe port 36 communicating with the reference water tank and a water storage part 31b. The tank 39 is configured to communicate the water storage parts 31a and 31b with the communication part 35, 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 the water level can be changed in a wide range while reducing the size.
[0025]
The partition means 34 is formed at a certain height from the tubular member, 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, the communication pipe type settlement meter of the present invention can be formed by connecting the second tank 39 provided with the partition means 34 to the conventional detection water tank. Then, zero drift can be corrected, and an accurate measurement value of the amount of settlement can be obtained.
[0026]
FIG. 3 is a view showing still another example of the detection water tank. Although the detection water tank 6 of the present embodiment is different from the example of FIG. 2 in the partitioning means, the others can be formed in the same manner, and therefore the same components are denoted by the same reference numerals and detailed description thereof is omitted.
The partition means 37 is formed at a certain height from the plate-like member, and is provided so as to partition the communication pipe port 36 provided at the bottom of the second tank 39 and the communication part 35.
Even with this configuration, by connecting the second tank 39 provided with the partition means 37 to the conventional detection water tank, the communication pipe type settlement meter of the present invention can be formed, and similar effects can be obtained. .
[0027]
In addition, in the said Example, although it does not explain providing an air pipe or air bleeding, of course, providing these so that the pressure which acts on a water pressure gauge with gas, such as air, may become constant in any part. It is. Of course, when the action of the gas is atmospheric pressure, the reference water tank, the communication pipe or the detection water tank may be opened. In addition, the present invention is not limited to the above-described embodiments, but includes configurations that can be modified and implemented without departing from the scope of the present invention. For example, drainage means may be provided for each required detection water tank as shown in FIG.
[0028]
FIG. 4 is a diagram showing a configuration of a detection water tank of the communication pipe type settlement meter. In the example of this figure, the same reference numerals are given to the same parts as in the previous embodiment, and the detailed description is omitted.
The detection water tank 5 of the present embodiment is a first tank 33 having a water storage part 31a provided with a water pressure gauge 32, a second water tank having a water supply / drainage part 38 having a communication pipe port 36 communicating with a reference water tank, and a water storage part 31b. 39, the water storage parts 31a and 31b are connected by the communication part 35, and the second tank 39 is provided with partition means 37 for maintaining the water level at a predetermined value. Further, an openable / closable discharge means 42 is provided at a connection portion 41 communicating from the water supply / drainage portion 38 to the communication pipe 3. By switching the drainage means (discharge means) 42, the stored water in the water supply / drainage section 38 is drained to the drainage pipe 43.
[0029]
The discharge means 42 is constituted by, for example, a three-way valve, and can be opened and closed in the direction of the drain pipe 43 and can be opened and closed with the communication pipe 3. 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 part 38. The water storage sections 31 a. 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 the measured value, and the normal measured value is corrected from this.
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, the subsidence amount of only the necessary measurement site can be accurately measured.
[0030]
FIG. 5 is a view showing another example of a single tank type detection water tank different from the type shown in FIGS.
The detection water tank 2 of the present embodiment has a water storage part 24 and a water supply / drainage part 25 formed by partition means 23 at the mouth end edge of the communication pipe 26 provided at a position higher than the position of the water pressure gauge 22.
Also with this configuration, the water level of the water storage unit 24 is maintained at the height of the partitioning means 23, and the zero drift can be known from the water pressure with respect to the known height and the measured value as described above.
Since the partition means has a simple structure, it is effective in terms of cost.
The same parts as those in the embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0031]
【The invention's effect】
As is clear from the above description, according to the communication pipe type subsidence meter of the present invention, it is possible to surely check for zero drift by simple operation only by adding a simple structure at the time of manufacture.
According to the communication pipe type settlement meter of claim 2, a system device can be easily added using a conventional device as it is, and zero drift can be checked by a simple operation.
In addition, according to the communication pipe type settlement meter of claim 3, since the detection water tank is partitioned by the partition member, a plurality of detection water tanks are caused to act on a constant water head intensively from one place on the reference water tank side at the same time. Can do. The drainage means of the communication pipe type subsidence meter can have a simple structure, and zero drift can be checked with simple operation.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a configuration of an embodiment of a communicating pipe type settlement meter of the present invention.
FIG. 2 is an explanatory view showing a part of the configuration of another embodiment of the communication pipe type settlement meter.
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 view showing a part of the configuration of another embodiment of the one tank type.
FIG. 6 is an explanatory diagram showing the configuration of a conventional communication pipe type settlement meter.
FIG. 7 is a block diagram showing an apparatus for measuring the amount of settlement using a communicating pipe type settlement meter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reference | standard water tank 2, 5, 6 Detection water tank 3 Communication pipe 4 Air pipe 7 Measurement water level fluctuation | variation part 11 Water tank main body 12 Circulating water retention tank 13 Pump 14 Drain pipe 15 Supply pipe 16 Overflow pipe 17 Drain means 21 Tank main body 22, 32 Water pressure gauge 23, 34, 37 Partition means (members)
24, 31a. 31b Water storage unit 25, 38 Water supply / drainage unit 26, 36 Communication pipe port 33 First tank 39 Second tank

Claims (3)

Communication consisting of a reference water tank that is installed at the reference position and that maintains a constant water level in the water tank and a circulating water tank, and a detection water tank that has a water pressure gauge that detects the amount of subsidence at the measurement site by the amount of change in the water level It is a tube-type subsidence meter, and is provided with a communication pipe that connects the reference water tank and the detection water tank. The upper part of the detection water tank is a measurement water level fluctuation part, and the lower part is opened to a water storage part that houses the water pressure gauge and a communication pipe. A water supply / drainage part having a communication pipe opening, the water storage part and the water supply / drainage part are defined by partition means for holding the water level of the water storage part constant, and the drainage means that can be freely opened and closed to discharge water communicating with the water supply / drainage part of the detection water tank A communication pipe type subsidence meter.   A first tank having an independent water storage section for accommodating a water pressure gauge, a second tank formed by partitioning a water supply / drainage section having a communication pipe port communicating with a reference water tank and a water storage section by a partitioning means; The communicating pipe type subsidence meter according to claim 1, wherein the communicating tank is connected to both tanks and communicates with both water storage parts.   The communicating pipe type subsidence meter according to claim 1, wherein the drainage means is connected to a reference water tank.

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