JP7129240B2 - Measuring device and measuring method - Google Patents

Description

The present invention relates to a measuring device and a measuring method.

In the case of rocks with poor geology, external pressure exceeding the value assumed in the design may act not only on the upper part of the tunnel but also on the bottom of the tunnel (inverted part). There is

If the uplift of the invert section continues, the ground around the tunnel will not stabilize, and it is necessary to take measures according to the degree of uplift phenomenon before it leads to destruction or collapse. In addition, since the placement of lining concrete at the invert section requires the convergence of tunnel deformation, it must be confirmed by displacement measurement, and displacement measurement at the invert section is important. However, in actual measurement, it is necessary to measure the vertical movement under the earth and sand that make up the roadbed. had been judged.

In relation to this, a relative position detection device has been developed that detects the amount of subsidence or inclination of a pipe buried underground (see, for example, Patent Document 1).

Also, a displacement meter has been developed that can measure the upheaval of the ground under the roadbed during excavation of a mountain tunnel (see, for example, Non-Patent Document 1). In this displacement gauge, a water pressure gauge buried under the roadbed is connected to a standard water tank on the ground through a vinyl pipe filled with water, and the uplift amount of the roadbed is measured by the difference in water head. This displacement meter can measure the vertical displacement of the inverted portion.

JP 2004-053317 A

"Development of 'Invert Displacement Meter' that can measure uplift of tunnel roadbed during construction", [online], Obayashi Corporation, [searched May 22, 2018], Internet, <http://www.obayashi. co.jp/press/news20150907_1＞

However, the technique described in Patent Document 1 detects the amount of subsidence and inclination of the pipe from the difference in the relative position between two points of the pipe, so it is possible to measure the displacement in the height direction at one point. I didn't. Therefore, it was not possible to meet the demand for measuring the height deformation of a specific portion of the inverted portion.

In addition, although the technique described in Non-Patent Document 1 can measure the displacement in the height direction at one point, it uses a water pressure gauge, so it is said that the cost is higher than the technique described in Patent Document 1. I had a problem. Therefore, it is costly to use a large number of displacement gauges at one construction site at the same time, such as when the displacement gauges are not collected or when multiple displacement gauges are used to observe the invert section at multiple points. Hiring was difficult. Furthermore, in the technique described in Non-Patent Document 1, the measurement result of the water pressure gauge is converted into an electric signal and transmitted to the data logger, so it is necessary to secure a power supply for use. Therefore, the technology described in Non-Patent Document 1 may be subject to restrictions depending on the usage environment.

From such a point of view, the present invention provides a measuring apparatus and a measuring method that have a higher degree of freedom in use than conventional ones, by simplifying the configuration and making it less likely to be restricted by the usage environment.

In order to solve the above-described problems, a measuring device according to the present invention is a measuring device that measures the amount of vertical displacement of a structure as the amount of change in the height of a liquid surface.
This measuring device includes a detection unit installed at a measurement point and containing a first liquid and a second liquid having different specific gravities; a first tubular member extending from the detection unit and containing the first liquid; A connecting portion having a second tubular member containing a second liquid, and a display portion having reading means capable of reading the position of the liquid surface of the second liquid.
The detection part has a coil part formed by winding at least one of the first tubular member and the second tubular member in a coil shape, and the position of the detection part is changed according to the displacement of the measurement point. In this case, the boundary between the first liquid and the second liquid circulates within the coil section.

In the measuring device according to the present invention, the amount of displacement of the detection section appears as the amount of change in the liquid surface due to the difference in specific gravity between the two liquids (the first liquid and the second liquid). Therefore, the amount of displacement in the vertical direction of the measurement point can be measured. Moreover, since the measuring device according to the present invention does not require a water pressure gauge or a power source, the configuration is simple and the usage environment is less likely to restrict it, so the degree of freedom of use is higher than that of the conventional device.
In addition, since the boundary does not move away from the measurement point and move to the connecting portion, the boundary always exists near the measurement point. Therefore, it is possible to measure the displacement amount of the measurement point in the vertical direction with high accuracy.

It is preferable that a separation liquid is contained between the first liquid and the second liquid for separating the first liquid and the second liquid so that they do not mix.

In this way, the first liquid and the second liquid do not mix (or do not easily mix), so the ideal specific gravity difference between the first liquid and the second liquid is maintained. Therefore, it is possible to measure the displacement amount of the measurement point in the vertical direction with high accuracy.

A first valve is installed at the tip of the first tubular member, and the tip of the second tubular member is preferably branched into a first branch pipe and a second branch pipe. The first branch pipe is provided with a second valve, and the second branch pipe is provided with a discharge nozzle for discharging the excess second liquid via the third valve. there is

By doing so, it becomes easier to adjust the position of the liquid surface, so that the displacement amount can be measured accurately and quickly.

Further, the measuring method according to the present invention is a measuring method for measuring the amount of vertical displacement of the structure as the amount of change in the height of the liquid surface.
This measurement method includes a preparation step of preparing a measuring device, an installation step of installing the measuring device on a structure to be measured, an adjustment step of adjusting the measuring device to an initial state, and using the measuring device and a measuring step of measuring the amount of displacement. Moreover, the adjustment process has a first process, a second process, and a third process.
The measuring device includes a detection unit installed at a measurement point and containing a first liquid and a second liquid having different specific gravities; a first tubular member extending from the detection unit and containing the first liquid; A connecting portion having a second tubular member containing a second liquid, and a display portion having reading means capable of reading the position of the liquid surface of the second liquid.
A first valve is installed at the tip of the first tubular member, and the tip side of the second tubular member is branched into a first branch pipe and a second branch pipe. A second valve is installed in the first branch pipe, and a discharge nozzle for discharging the surplus second liquid via the third valve is installed in the second branch pipe.
In the first step, from a state in which the first valve, the second valve and the third valve are closed, the first valve and the third valve are opened to lower the liquid level of the first liquid. At the same time, the excess second liquid is discharged from the discharge nozzle.
In the second step, from the state of the first step, the first valve is closed and the second valve is opened to lower the liquid level of the second liquid and remove the surplus of the second liquid. It is further discharged from the discharge nozzle.
In the third step, the first valve is opened and the third valve is closed from the state of the second step.

In the measuring method according to the present invention, the amount of displacement of the detection unit appears as the amount of change in the liquid surface due to the difference in specific gravity between the two liquids (the first liquid and the second liquid). Therefore, the amount of displacement in the vertical direction of the measurement point can be measured. Moreover, since the measuring method according to the present invention does not require a water pressure gauge or a power source, the configuration is simple and the usage environment is less likely to restrict it.
In addition, in the measuring method according to the present invention, since the position of the liquid surface can be easily adjusted, the amount of displacement can be measured accurately and quickly.

According to the present invention, since the configuration is simple and the use environment is less likely to restrict the device, the degree of freedom in use is higher than in the conventional art.

1 is an overall view of a measuring device according to an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the detection part which comprises the measuring device which concerns on embodiment of this invention, (a) is a top view, (b) is a longitudinal cross-sectional view. In (a), a portion of the connecting portion is broken to show the inside. Also, in (b), the description of the liquid contained in the first tubular member and the second tubular member is omitted. FIG. 4 is an image diagram of a detection unit main body; It is a front view of the display part which comprises the measuring device which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the principle of operation of the measuring device which concerns on embodiment of this invention, (a) shows the state before displacement generation, (b) shows the state after displacement generation. FIG. 4 is a diagram for explaining the adjustment process of the measuring device according to the embodiment of the present invention, where (a) shows the state before performing the first step, and (b) shows the state after performing the first step; , (c) shows the second step, and (d) shows the third step.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described in detail with appropriate reference to the drawings. Each figure is merely a schematic representation to the extent that the present invention can be fully understood. Accordingly, the present invention is not limited to the illustrated examples only. In addition, in each figure, the same code|symbol is attached|subjected about a common component and a similar component, and those overlapping description is abbreviate|omitted.

<Configuration of measuring device according to embodiment>
A configuration of a measuring device 1 according to an embodiment will be described with reference to FIG. The measuring device 1 measures the vertical displacement of an object to be measured. The displacement is a relative distance in the vertical direction with respect to a certain reference point, and is, for example, the difference between the position of the measurement object at the first time and the position of the measurement object at the second time. The object to be measured is not particularly limited as long as it causes displacement in the vertical direction with the lapse of time. The measuring device 1 according to the embodiment is effective in measuring the displacement of a structure located in an invisible or difficult-to-visually-visible location such as underground or underwater.

Here, as shown in FIG. 1, it is assumed that the measuring device 1 is used for displacement measurement of the inverted portion 2a of the tunnel 2 under construction. Since a large external pressure also acts on the inverted portion 2a in a ground with a large soil covering or an expansive ground, a phenomenon in which the inverted portion 2a rises may occur. In the present embodiment, the position (displacement) of the inverted portion 2a after the lapse of a predetermined time is measured using the position of the inverted portion 2a immediately after construction as a reference point. The inverted portion 2a here is buried in the roadbed 3 and cannot be visually recognized.

The measuring device 1 is a liquid column type measuring instrument that measures the amount of displacement in the vertical direction of an object to be measured as the amount of change in the height of a liquid that is a working medium. In the measuring device 1 of this embodiment, two types of liquids having different specific gravities are used as working media. Hereinafter, of the two types of liquids, the liquid with the higher specific gravity will be referred to as the "heavy liquid", and the liquid with the lower specific gravity will be referred to as the "light liquid". In this embodiment, the heavy liquid corresponds to the "first liquid", and the light liquid corresponds to the "second liquid".

As shown in FIG. 1, the measuring apparatus 1 includes a detection unit 10 installed at a measurement point P of an inverted portion 2a, which is an object to be measured, and a display unit that displays the displacement of the inverted portion 2a as a change in the position of the liquid surface. 20 and a connecting portion 30 that connects the detecting portion 10 and the display portion 20 . The display unit 20 is installed at a position higher than the measurement point P (that is, a position higher than the detection unit 10), where vertical displacement does not occur over time (even if it does, it is very small). be. The display unit 20 is installed on the side wall 2b of the tunnel 2, for example.

The detection unit 10 is installed at a measurement point P (see FIG. 1), and as shown in FIG. 2, includes a detection unit main body 10a and a case portion 10b.
The case part 10b is not particularly limited as long as it can be installed so as not to move from the measurement point P while protecting the detection part main body 10a. The detector main body 10a is fixed inside the case portion 10b by a fixing means (not shown). In addition, the detection part 10 may be configured without the case part 10b.

As shown in FIG. 2( a ), the detection unit main body 10 a includes a first tubular member 11 mainly containing heavy liquid, a second tubular member 12 mainly containing light liquid, and the first tubular member 11 . and a folded portion 13 that communicates with the second tubular member 12 . Since the folded portion 13 is a component provided to facilitate the manufacture of the detection portion main body 10 a , the detection portion main body 10 a may be configured without the folded portion 13 . In this embodiment, the inner diameters of the first tubular member 11 and the second tubular member 12 are the same. Further, as shown in FIG. 2, at least one of the first tubular member 11 and the second tubular member 12 (here, the second tubular member 12) is wound multiple times within the case portion 10b to form a coil portion. 14 are formed.

As shown in FIG. 3, in this embodiment, an isolation silicone oil is contained between the heavy liquid and the light liquid to separate these liquids so that they do not mix. Sequestration silicone oil is an example of a separating liquid. The amount of sequestering silicone oil is not particularly limited, and should be the minimum amount that does not allow the heavy liquid and the light liquid to mix. As a result, the coil portion 14 in the present embodiment has a heavy liquid side boundary portion K1 that is the interface between the heavy liquid and the isolated silicone oil, and a light liquid side boundary portion K2 that is the interface between the light liquid and the isolated silicone oil. formed. By using isolation silicone oil with a predetermined viscosity, the heavy liquid side boundary K1 and the light liquid side boundary K2 can be appropriately formed regardless of the viscosity of the heavy liquid or the light liquid. If the heavy liquid and the light liquid are immiscible, the isolation silicone oil may not be provided (that is, the heavy liquid and the light liquid may be in contact with each other to form an interface. ).

The boundary portion between the heavy liquid and the light liquid (here, the region from the heavy liquid side boundary portion K1 to the light liquid side boundary portion K2, hereinafter referred to as the “boundary portion K”) is a “measurement step” described later. , and moves inside the first tubular member 11 and the second tubular member 12 in the "step of adjusting the measuring device". In this embodiment, the boundary portion K is prevented from moving to the outside of the coil portion 14 (connecting portion 30). That is, the number of turns N and the radius R of the coil portion 14 are set such that the boundary portion K does not move outside the coil portion 14 . The amount of movement of the boundary portion K is determined by the difference in specific gravity between the heavy liquid and the light liquid, the distance L from the detection section 10 to the display section 20 (see FIG. 1), and the like.

The folded portion 13 includes a heavy liquid side connection portion 13a, a light liquid side connection portion 13b, and a U-shaped pipe 13c. An end portion of the first tubular member 11 is attached to the heavy liquid side connection portion 13a, and an end portion of the second tubular member 12 is attached to the light liquid side connection portion 13b. Since the first tubular member 11 and the second tubular member 12 are in communication via the folded portion 13, the liquids in the first tubular member 11, the second tubular member 12, and the U-shaped tube 13c are mutually movable. is. By removing either one of the heavy liquid side connection portion 13a and the light liquid side connection portion 13b, the liquid can be injected into the first tubular member 11, the second tubular member 12, and the folded portion 13, and the first The liquid in the tubular member 11, the second tubular member 12 and the folded portion 13 can be drained.

As shown in FIG. 1, the connecting portion 30 connects the detecting portion 10 and the display portion 20, and in this embodiment, is installed along the inverted portion 2a and the side wall 2b of the tunnel 2. . In addition, the installation method of the connection part 30 is not limited to what is shown in FIG. As shown in FIG. 2( a ), the connecting portion 30 includes a first tubular member 11 containing heavy liquid, a second tubular member 12 containing light liquid, and first tubular member 11 and second tubular member 12 . and a protective tube 31 that protects the The first tubular member 11 and the second tubular member 12 here are cylindrical tubes.

As shown in FIG. 4, a first tubular member 11 containing a heavy liquid and a second tubular member 12 containing a light liquid are fixed side by side to the display unit 20 so as to extend vertically. Further, the display unit 20 is provided with a scale plate 25 having a scale 25a for reading the position of the surface of the liquid to be measured (here, the liquid surface B2a of the light liquid). The scale plate 25 is an example of reading means, and the reading means is not limited to the scale plate 25 . The scale 25a is set with a zero point 25b at which the liquid surface B2a of the light liquid is aligned before displacement occurs. In order to make it easier to read the position of the liquid surface B2a of the light liquid, the liquid surface B2a of the light liquid may be colored with a color that is easy to see, or the liquid surface of the light liquid may be marked with a colored liquid (for example, oil). B2a may be covered.

A first valve 21 is attached to the end of the first tubular member 11 so that the end of the first tubular member 11 can be opened and closed. Although the details will be described later, the liquid surface B1a of the heavy liquid is positioned away from the end of the first tubular member 11 during measurement. The heavy liquid presents a columnar shape in the first tubular member 11, and is hereinafter sometimes referred to as a "heavy liquid column".

The second tubular member 12 is branched by a branch portion 22 into a first branch pipe 12a and a second branch pipe 12b. A second valve 23 is attached to the end of the first branch pipe 12a so that the end of the first branch pipe 12a can be opened and closed. Although the details will be described later, during measurement, the liquid surface B2a of the light liquid is positioned away from the end of the first branch pipe 12a. The light liquid presents a columnar shape in the first branch pipe 12a, and is hereinafter sometimes referred to as a "light liquid column". A discharge nozzle 24a having an inner diameter much smaller than that of the second branch pipe 12b is attached via a third valve 24 to the end of the second branch pipe 12b. Although the details will be described later, excess light liquid generated when adjusting the measuring device 1 to an initial state in which it can be used is discharged from the discharge nozzle 24a. The tip of the discharge nozzle 24 a is aligned with the zero point 25 b of the scale plate 25 .

(Operating principle of measuring device)
The operating principle of the measuring device 1 will be described with reference to FIG. FIG. 5 is a schematic diagram showing the head balance of two liquid columns (heavy liquid column and light liquid column).
Let us consider a case where liquid columns composed of two kinds of liquids having different specific gravities and immiscible (immiscible) come into contact with each other in a pool as shown in FIG. As shown in FIG. 5A, if the height of the head of the heavy liquid is "H", the height of the head of the light liquid is balanced at the position of "( _ρh / _ρl )·H". “ρ _h ” is the specific gravity of the heavy liquid, and “ρ _l ” is the specific gravity of the light liquid. Also, the height "Hc" of the liquid pool is assumed to be so small as to be negligible compared to the height "H". Note that in the measuring apparatus 1 shown in FIG. 1, the liquid pool is not of a tank structure but of a coil structure in which a tubular member is wound multiple times for the purpose of improving the stability of the liquid pool and reducing the temperature dependence.

Here, as shown in FIG. 5(b), when a vertical displacement "x" occurs in the puddle, the balance of each water head is lost. ΔH _h , ΔH _l ”.
At this time, the balance of both water heads is represented by the following formula (1).
(H−x+ΔH _h ): {(ρ _h /ρ _l )·H−x+ΔH _l }=ρ _l :ρ _h Equation (1)
Also, since the volume of the liquid moving between the two liquid columns is the same, the following equation (2) holds. Here, "A _h " is the liquid column area of the heavy liquid, and "A _l " is the liquid column area of the light liquid.
(A _h · ΔH _h ) = (−1 · A _l · ΔH _l ) Equation (2)

From the equations (1) and (2), the relationship between the amount of change "ΔH _l " of the light liquid column and the displacement "x" of the liquid pool is given by the following equation (3).
ΔH _l = (ρ _l −ρ _h )/{ρ _l +ρ _h・(A _l /A _h )}・x Equation (3)
That is, if 'ΔH _l ' (or 'ΔH _h ' may be used) can be known, the displacement 'x' of the puddle can be known. Also, the greater the difference in specific gravity between the two types of liquid and the thinner the light liquid injection is compared to the heavy liquid injection, the more sensitive the light liquid column change amount "ΔH _l " to the displacement "x" of the liquid pool. . However, if the tube containing the liquid column is too narrow, the movement of the liquid column will be poor due to the viscous resistance of the liquid.

(Method for manufacturing measuring device)
The measuring device 1 can be manufactured using various materials. In particular, the heavy liquid, the light liquid, and the materials of the first tubular member 11 and the second tubular member 12 containing these liquids are important because they affect the accuracy of the displacement amount to be measured. In addition, when selecting materials, it is necessary to consider the compatibility of each material in addition to specifying individual materials. Examples of materials that can be used in the measuring device 1 are shown below.

As the light liquid, for example, spindle oil, silicon oil, water, and ethylene glycol can be used.
As the heavy liquid, for example, NaNO ₃ +Ca(NO ₃ ) ₂ mixed aqueous solution, ZnCl ₂ solution, sodium polytungstate (SPT) aqueous solution can be used.

The properties that the materials of the first tubular member 11 and the second tubular member 12 preferably have are a low coefficient of thermal expansion, impermeability (or impermeability) to light liquids and heavy liquids, and It has no (or little effect) chemical reaction with the liquid or isolating silicone oil, high durability, and so on.
As materials for the first tubular member 11 and the second tubular member 12, for example, nylon, polyolefin, fluororesin (FEP, PFA), polypropylene, and stainless steel can be used.

<Measuring method using the measuring device according to the embodiment>
A displacement measuring method using the measuring device 1 according to the embodiment will be described with reference to FIGS. The steps of the measuring method mainly include a "measurement device preparation process", a "measurement device installation process", a "measurement device adjustment process", and a "measurement process using the measurement device". Each step will be described below.

(Preparation process for measuring device)
The “measuring device preparation process” is a process of preparing the measuring device 1 . In this step, for example, a heavy liquid is injected into the first tubular member 11 and a light liquid is injected into the second tubular member 12 . In addition, the folded portion 13 is removed, and isolation silicone oil is injected between the heavy liquid and the light liquid. After containing the heavy liquid, light liquid and isolated silicone oil, the first valve 21, the second valve 23 and the third valve 24 are closed.

(Installation process of measuring device)
The “measuring device installation process” is a process of installing the measuring device 1 . In this step, for example, as shown in FIG. 1, the detection unit 10 is installed at the measurement point P of the inverted portion 2a, which is the object to be measured, and the connecting portion 30 is installed along the inverted portion 2a and the side wall 2b. . In addition, the display unit 20 is installed on the side wall 2b where vertical displacement does not occur with the lapse of time (even if it does occur, it is very small).

(Adjustment process of measuring device)
The “measuring device adjustment process” is a process for adjusting the measuring device 1 to an initial state in which it can be used. In this step, as shown in FIG. 6A, the first valve 21 and the third valve 24 are opened. Note that the second valve 23 is kept closed. As a result, as shown in FIG. 6B, the liquid surface B1a of the heavy liquid column is increased to a position where the liquid surface B1a of the heavy liquid column (see FIG. 4) and the liquid surface B2a of the light liquid column (see FIG. 4) are balanced. (see FIG. 4) is reduced. Along with this, the excess light liquid is discharged from the discharge nozzle 24a, and the isolated silicone oil moves in the coil portion 14 toward the light liquid column side. In this embodiment, since the lengths of the first tubular member 11 and the second tubular member 12 constituting the coil portion 14 are sufficiently long, even if the isolated silicon oil moves, the boundary portion K (see FIG. 3) does not move to the outside of the coil portion 14. As a result, the liquid surface B1a of the heavy liquid column moves to a position lower than the zero point 25b of the scale plate 25 (see FIG. 4).

Subsequently, as shown in FIG. 6(c), the first valve 21 is closed and the second valve 23 is opened. Note that the third valve 24 is left open. As a result, the liquid surface B2a (see FIG. 4) of the light liquid column drops to the zero point 25b of the scale plate 25 (see FIG. 4). Along with this, the excess light liquid is discharged from the discharge nozzle 24a.

Subsequently, as shown in FIG. 6(d), the first valve 21 is opened and the third valve 24 is closed. Note that the second valve 23 is left open. This completes the adjustment process of the measuring device.

(Measurement process using measuring device)
A “measurement step using a measuring device” is a step of measuring the displacement of the measurement point P in the vertical direction using the measuring device 1 . This step is performed, for example, at predetermined time intervals. In this step, the operator (see FIG. 1) confirms the position of the liquid surface B2a (see FIG. 4) of the light liquid column using the scale plate 25, and follows the formula (3) described above. The position is calculated as the position of the measurement point P. Then, for example, it is determined whether or not the displacement amount of the measurement point P is within the allowable range, and if the displacement amount exceeds the allowable range, appropriate measures such as spraying concrete on the inverted portion 2a are taken. . In the present embodiment, since the lengths of the first tubular member 11 and the second tubular member 12 constituting the coil portion 14 are sufficiently long, even if the isolated silicon oil moves with the displacement of the measurement point P, Also, the boundary portion K (see FIG. 3) does not move outside the coil portion 14 .

As described above, in the measuring device 1 according to the present embodiment, the amount of displacement of the detection unit 10 appears as the amount of change in the liquid surface due to the difference in specific gravity between the two types of liquids (heavy liquid and light liquid). Therefore, the displacement amount of the measurement point P in the vertical direction can be measured. Since the measuring device 1 according to the present embodiment does not require a water pressure gauge or a power source, it has a simple configuration and is less subject to restrictions due to usage environments, and thus has a higher degree of freedom in use than conventional devices.

Further, in the measuring device 1 according to the present embodiment, even when the heavy liquid and the light liquid move as the detection section 10 is displaced, the boundary portion K between the heavy liquid and the light liquid circulates inside the coil section 14. do. That is, since the boundary portion K does not leave the measurement point P and move to the connecting portion 30, the boundary portion K always exists near the measurement point P. Therefore, the vertical displacement amount of the measurement point P can be measured with high accuracy.

[Modification]
Although the embodiment of the present invention has been described above, the present invention is not limited to this, and can be implemented within the scope of the claims.

In the present embodiment, the scale plate 25 is used to read the position of the liquid level B2a of the light liquid, but the position of the liquid level B1a of the heavy liquid may be read. In that case, the light liquid corresponds to the "first liquid" and the heavy liquid corresponds to the "second liquid".

In addition, in the present embodiment, the detection unit 10 is a coil portion in which at least one of the first tubular member 11 and the second tubular member 12 (here, the second tubular member 12) is wound multiple times within the case portion 10b. had 14. However, even if the heavy liquid and the light liquid move along with the displacement of the detection section 10, it is sufficient if the boundary portion K between the heavy liquid and the light liquid can be maintained within the detection section 10. The method of storing the first tubular member 11 and the second tubular member 12 in is not limited to this. For example, at least one of the first tubular member 11 and the second tubular member 12 may be accommodated in the case portion 10b in an S-shaped or M-shaped state. Further, as shown in FIG. 5, instead of the coil portion 14, a tank structure may be used.

REFERENCE SIGNS LIST 1 measurement device 2 tunnel 2a invert section 10 detection section 11 first tubular member 12 second tubular member 12a first branch pipe 12b second branch pipe 13 folded section 14 coil section 20 display section 21 first valve 22 branch section 23 second Valve 24 Third valve 24a Discharge nozzle 25 Scale plate (reading means)
30 connection part P measurement point K boundary part

Claims (4)

A measuring device that measures the amount of vertical displacement of a structure as the amount of change in the height of a liquid,
a detection unit installed at a measurement point and containing a first liquid and a second liquid having different specific gravities;
a connecting portion extending from the sensing portion and having a first tubular member containing the first liquid and a second tubular member containing the second liquid;
a display unit having reading means capable of reading the position of the liquid surface of the second liquid ,
The detection section has a coil section in which at least one of the first tubular member and the second tubular member is wound into a coil,
When the position of the detection unit is changed due to the displacement of the measurement point, the boundary between the first liquid and the second liquid circulates within the coil.
A measuring device characterized by: 2. The method according to claim 1 , wherein a separation liquid is contained between the first liquid and the second liquid for separating the first liquid and the second liquid so that the first liquid and the second liquid are not mixed. Measuring device as described. A first valve is installed at the tip of the first tubular member,
The distal end side of the second tubular member is branched into two, a first branch pipe and a second branch pipe,
A second valve is installed in the first branch pipe,
The second branch pipe is provided with a discharge nozzle for discharging the surplus second liquid via a third valve,
3. The measuring device according to claim 1 or 2 , characterized in that: A measurement method for measuring the amount of displacement in the vertical direction of a structure as the amount of change in the height of a liquid surface,
A preparatory step of preparing a measuring device;
an installation step of installing the measuring device on a structure to be measured;
an adjustment step of adjusting the measuring device to an initial state;
a measuring step of measuring a displacement amount using the measuring device,
The measuring device is
a detection unit installed at a measurement point and containing a first liquid and a second liquid having different specific gravities;
a connecting portion extending from the sensing portion and having a first tubular member containing the first liquid and a second tubular member containing the second liquid;
a display unit having reading means capable of reading the position of the liquid surface of the second liquid,
A first valve is installed at the tip of the first tubular member,
The distal end side of the second tubular member is branched into two, a first branch pipe and a second branch pipe,
A second valve is installed in the first branch pipe,
The second branch pipe is provided with a discharge nozzle for discharging the surplus second liquid via a third valve,
The adjustment step includes
The first valve, the second valve, and the third valve are closed, and then the first valve and the third valve are opened to lower the liquid level of the first liquid, and the surplus of the liquid is a first step of discharging the second liquid from the discharge nozzle;
From the state of the first step, the first valve is closed and the second valve is opened to lower the liquid level of the second liquid, and the surplus of the second liquid is further discharged from the discharge nozzle. a second step of discharging;
a third step of opening the first valve from the state of the second step and closing the third valve;
A measuring method characterized by:

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