JP2718990B2 - Level measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a level for monitoring long-term level fluctuations such as measurement of uneven settlement of a structure using manometers arranged at a plurality of measurement points. It relates to a measuring device.

(Prior art) As a monitoring device for long-term level fluctuations such as measurement of uneven settlement of structures, a displacement manometer that detects a predetermined water level is placed at each measurement point, and a reference manometer that continuously detects the water level is used. A level measuring device that communicates with these displacement manometers via a pipe has been proposed with the present applicant as a joint applicant (Japanese Patent Application No. 63-269235 (Japanese Patent Application Laid-Open No. Hei 2-269235).
115712 No. 2)).

In this measuring device, the level is measured while continuously injecting water into the pipeline, and the level of each measuring point, that is, the predetermined reference level, is determined by the detected water level of the reference manometer when each displacement manometer detects the predetermined water level. The height from the point is detected.

(Problems of the Invention) However, when trying to measure the level of, for example, an elongated building with this apparatus, the friction loss of water moving in the pipe increases due to the length of the pipe, and the responsiveness of the liquid level change to water injection increases. There is a problem that the measurement takes a long time because the temperature decreases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a level measurement device capable of efficiently performing level measurement over a wide range in order to solve the above problems.

(Means for Achieving the Object) According to the present invention, a displacement manometer for detecting a predetermined water level is arranged at each of a plurality of measurement points set in each block obtained by dividing a measurement area, and a reference for continuously detecting the water level is provided. A manometer A is arranged for each block, communicates with each displacement manometer in the block through a pipe, and the reference manometer A of each block is connected to another reference manometer B via a shutoff valve, and the shutoff valve is closed. The level with respect to the reference manometer A of each measurement point detected by continuously injecting water into the pipe line at the time of valve is determined according to the difference between the installation levels of the reference manometers A and B detected by opening the shutoff valve. A means for correcting is provided.

(Operation) By closing the shutoff valve and injecting water into the pipeline for each block, the water levels of the reference manometer A and the displacement manometer in the block rise integrally, and the reference manometer A when the displacement manometer detects a predetermined water level. , The level of each measurement point in the block with respect to the reference manometer A is detected.

On the other hand, each reference manometer A and another reference manometer B which communicated by opening the shut-off valve,
And a difference between the installation levels of the reference manometers A and.

The correction unit corrects the level of each measurement point detected in each block according to the level difference,
The levels of all measurement points based on the same reference manometer B are obtained.

(Example) FIG. 1 shows an example of the present invention.

This figure shows a state in which a number of measurement points provided for measuring the differential settlement of a certain structure are divided into three blocks (a) to (c), and each of the blocks (a) to (c) A displacement manometer 1 communicating with the pipeline 2 is provided at the measurement point, and a reference manometer A communicating with the pipeline 2 via the shut-off valve 4 is provided for each of the blocks (a) to (c).

The pipeline 2 is connected to a water supply device (not shown) via a water injection valve 5 and a drain via a drain valve 6 for each of the blocks (a) to (c).

The displacement manometer 1 includes therein an electrode rod connected to the controller 7 via a signal cable. A constant voltage is constantly applied to the electrode rod from the controller 7, and when the rising water surface comes into contact with the tip of the electrode rod, a current flows through the pipe line 2 as ground and outputs an ON signal to the controller 7.

On the other hand, the reference manometer A internally has a float that rises and falls with the water level, and outputs a water level signal corresponding to the position of the float to a controller 7 connected via a signal cable.
Output to

The reference manometer A of each of the blocks (a) to (c) is connected to a pipe 9 via a shutoff valve 8. This pipe 9 is a water injection valve
It is connected to a water supply device through 10 and to a drain through a drain valve 11, respectively. Further, another reference manometer B configured similarly to the reference manometer A is provided in the middle of the pipe 9.

The controller 7 functions as a means for correcting the level of the measurement point of each of the blocks (a) to (c) according to the difference between the installation levels of the reference manometers A and B.

That is, the controller 7 calculates and stores the difference between the installation level of the reference manometer B and the installation level of each of the reference manometers A based on the water level signals input from the reference manometer B and the reference manometers A of the blocks (a) to (c). Store it in the device.
When the input signals from the displacement manometers 1 of the blocks (a) to (c) change to ON, each measurement is made at that time by the water level signal input from the reference manometer A in the blocks (a) to (c). The level of the point is detected, corrected based on the difference between the installation levels of the reference manometer A and the reference mamanometer B stored in the storage device, and displayed together with the number of the measurement point where the displacement manometer 1 is installed.

 Next, the operation will be described.

When performing measurement, first, each of the blocks (a) to (c)
The shutoff valve 4 is closed, the shutoff valve 8 is opened, each reference manometer A is communicated with the pipeline 9, the drain valve 11 is closed, and the water injection valve 10 is opened to fill the reference manometers A and B with water so that the water levels can be detected. I do. Thereby, the reference manometer A is added to the controller 7.
And a water level signal are input from the controller B, and the controller 7 calculates a difference between the installation levels of the reference manometer B and the respective reference manometers A from these water levels and stores the difference in the storage device.

Next, after the water injection valve 10 is closed and the drain valve 11 is opened to empty the reference manometers A and B, the shutoff valve 8 is closed to shut off the communication between the reference manometers A. Then, the shutoff valve 4 and the water injection valve 5 of the block (a) are opened, the drain valve 6 is closed, and water is continuously supplied to the pipeline 2. As a result, the water levels in the reference manometer A and each displacement manometer 1 rise, and when the rising water surface comes into contact with the tip of the electrode rod, an ON signal is output from the displacement manometer 1 to the controller 7. The controller 7 detects the level of each measurement point with respect to the reference manometer A from the water level signal input from the reference manometer A at the same time as the input of the ON signal.

Then, this level is corrected based on the difference between the stored installation levels of the reference manometers A and B, and the corrected value is displayed as the level of the measurement point together with the number of the measurement point.

In this manner, the controller 7 corrects and displays the level of the measurement point every time an ON signal is input from the displacement manometer 1 in the block (a).

When the measurement of the block (a) is completed, the measurement of the blocks (b) and (c) is sequentially performed in the same procedure, but the level of each measurement point is also stored in the storage device for the blocks (b) and (c). It is displayed after correction based on the difference between the installation levels of the reference manometers A and B. Therefore, the numerical values displayed for each measurement point in each of the blocks (a) to (c) are levels based on the same reference manometer B.

Since the measurement range is divided into blocks (a) to (c), the length of the pipe 2 connecting the displacement manometer 1 and the reference manometer A in each block (a) to (c) is short, and , Each displacement manometer 1 responds satisfactorily to water injection. Therefore, the time required for water injection is short, and the measuring operation is performed efficiently. When it is desired to measure only a specific area, blocks (a) to
If the above measurement is performed for only one or two of (c), the measurement can be performed in a short time without spending extra measurement time. Further, by increasing the number of blocks, it is possible to easily cope with a wider measurement range.

(Effects of the Invention) As described above, the present invention divides a measurement area into a plurality of blocks, and uses the reference manometer A provided for each block.
While sequentially detecting the level of each measurement point where the displacement manometer is installed, the difference between the installation level of the reference manometer B and the installation level of each reference manometer A is detected by connecting another reference manometer B and the reference manometer A of each block. Since the level of each measurement point is corrected based on this level difference to obtain the levels of all the measurement points based on the same reference manometer B, the length of the pipeline for performing continuous water injection is short, and the The level of each measurement point scattered over a wide measurement range can be accurately detected in a short time while minimizing friction loss. In addition, since the diameter of the conduit may be small, piping space and cost are also reduced. Further, the measurement can be performed only for a specific block as needed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a level measuring device showing an embodiment of the present invention. 1 ... displacement manometer, 2, 9 ... conduit, 7 ... controller, 8 ... shutoff valve, A, B ... reference manometer,
(A), (b), (c) ... Block.

Claims (1)

(57) [Claims] 1. A displacement manometer for detecting a predetermined water level is arranged at each of a plurality of measurement points set in each block obtained by dividing a measurement area, and a reference manometer A for continuously detecting a water level is arranged for each block. To communicate with each displacement manometer in the block via a pipe, connect the reference manometer A of each block to another reference manometer B via a shutoff valve, and continuously connect to the pipe when the shutoff valve is closed. Means for correcting the level of each measurement point detected by injecting water into the reference manometer A in accordance with the difference between the installation levels of the reference manometers A and B detected by opening the shut-off valve. Characteristic level measurement device.