JP2016024043A - Liquid passage type displacement meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid passage type displacement meter capable of accurately measuring vertical displacement in a short time, in an open channel type displacement meter as a device for measuring vertical displacement in a structure.SOLUTION: In a liquid passage type displacement meter in which plural liquid tanks 11 are connected to each other with a liquid passage 20, in at least one of the liquid tank 11 and the liquid passage 20, provided is an oscillation suppression material 30 suppressing oscillation of a liquid surface. The oscillation suppression material 30 can employ a member, such as nylon nonwoven fabric, in which linear materials such as nylon fiber are combined to form a predetermined thickness.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a liquid path type displacement meter, and specifically relates to a technique of a liquid path type displacement meter that enables accurate vertical displacement measurement in a short time.

  There is an open channel displacement meter as a device for measuring a vertical displacement in a structure. The open channel type displacement meter has a basic structure with a so-called open channel with the water surface opened to the atmosphere, and performs displacement measurement at a series of measurement points provided at predetermined intervals along the open channel. Each measurement point is provided with a water tank with a floating float and an eddy current sensor for detecting the amount of vertical movement of the float. The aquarium is connected to the structure and shows the movement of the subsidence and uplift as the structure subsidence and uplift. For example, when a tank of a certain point sinks due to the subsidence of a structure, the vertical distance between the floating top of the surface where the water level is constant regardless of the tank subsidence and the eddy current sensor that sinks with the tank However, it changes from the state before subsidence. From this change amount, it is possible to detect the displacement amount of the measurement point and the relative displacement amount between the measurement points.

  Such an open-channel displacement meter has characteristics that provide stable measurement results against environmental changes such as temperature and humidity, and is often applied to situations where long-term stable displacement measurement is required. I came. As a conventional technique of an open channel type displacement meter, for example, a liquid path that is installed between fixed points and has a space above the stored liquid, and a plurality of displacement measuring units that are configured through a flexible part in the middle of the liquid path, A float body that is provided along the liquid path and floats in the stored liquid and passes through each displacement measurement section; first and second support sections that support both ends of the float body in a freely floating manner; and each displacement measurement section includes An open channel type horizontal displacement meter (refer to Patent Document 1) including a non-contact displacement sensor that measures a horizontal separation distance corresponding to the opposed position of the float body has been proposed.

JP 2013-181973 A

  However, since the conventional open channel displacement meter is difficult to measure accurately until the fluctuation of the water surface in the aquarium according to the behavior of the structure converges, it is difficult to carry out load transfer work when applying the underpinning method. This method is not suitable for situations where it is necessary to obtain measurement results in a short time, such as displacement measurement of structures. On the other hand, when measuring equipment such as a dial gauge displacement meter is installed in order to perform such measurement in a short time, a measurement mechanism different from the existing open channel displacement meter is added. And led to an increase in labor.

  Therefore, an object of the present invention is to provide a technique of a liquid path type displacement meter that enables accurate vertical displacement measurement in a short time.

  The liquid path type displacement meter of the present invention that solves the above problems is a liquid path type displacement meter configured by connecting a plurality of liquid tanks with liquid paths, and is at least one location of the liquid tank or the liquid path In addition, a rocking suppression material that suppresses rocking of the liquid surface is provided.

  According to this, for example, when a vertical displacement occurs in the structure to be measured, a water surface fluctuation occurs in the liquid tank at the corresponding location of the liquid path type displacement meter along with the vertical displacement. Since the energy is absorbed in the rocking suppression material that is appropriately passed, the water surface rocking can be converged more quickly than in the case where the rocking suppression material is not installed.

  In other words, according to the present invention, the water surface fluctuation in the liquid path type displacement meter due to the vertical displacement generated in the structure is quickly converged, and the accurate vertical movement in the liquid path type displacement meter can be performed in a short time on the calm water surface. Displacement measurement is possible. Therefore, the liquid path type displacement meter of the present invention can be applied to both long-term and short-term measurement situations, and switching between displacement measurement systems depending on the length of measurement time, and between such displacement measurement systems as in the past. This eliminates the need for complicated operations such as matching the measured values and adjusting errors. In addition, the cost for introducing and operating the displacement measurement system can be suppressed by unifying the displacement measurement system and reducing various operations associated with the displacement measurement.

  In the above-described liquid path type displacement meter, the rocking suppression material may be configured by intertwining a plurality of linear materials.

  According to this, in the rocking suppression material, the liquid movement accompanying the above-described rocking of the water surface is received not by the surface but by the line, that is, each linear material, and appropriately absorbs the energy of the water surface rocking, Compared to the sufficiently large opening between the linear members, the above-mentioned liquid can be efficiently received and passed. Therefore, it is possible to accurately propagate the water level change corresponding to the displacement in the structure or the like in the liquid passage while allowing the water surface fluctuation to settle down in a short time. Vertical displacement measurement is possible.

  Further, in the above-described liquid path type displacement meter, the swing suppressing material may be a nylon nonwoven fabric.

  According to this, the above-mentioned rocking | fluctuation suppression material can be comprised with a nylon nonwoven fabric with easy acquisition and low cost, and the liquid path type displacement meter which enables the accurate vertical displacement measurement in a short time, It can be introduced at low cost and easily.

  Further, in the above-described liquid path type displacement meter, the rocking suppression material may be further provided at the end of the liquid path.

  According to this, when the fluctuation of the water surface propagating in the liquid passage reaches the end of the liquid passage, the fluctuation restraining material appropriately receives this to absorb the energy, and the water surface toward the other liquid passage end. By suppressing the reflection of oscillation, vertical displacement measurement in a short time in a liquid path type displacement meter can be made more accurate.

  ADVANTAGE OF THE INVENTION According to this invention, the accurate vertical displacement measurement in a short time in a liquid path type displacement meter is attained.

It is a top view which shows the whole structural example 1 of the liquid path type displacement meter in this embodiment. It is a sectional side view which shows the whole structural example 1 of the liquid-path type displacement meter in this embodiment. It is a top view which shows the example of installation structure of the rocking | fluctuation suppression material in the water tank of the liquid path type displacement meter of this embodiment. It is sectional drawing which shows the installation structural example 1 of the rocking | fluctuation suppression material in the water tank of the liquid path type displacement meter of this embodiment. It is sectional drawing which shows the installation structural example 2 of the rocking | fluctuation suppression material in the water tank of the liquid path type displacement meter of this embodiment. It is a figure which shows the structural example of the rocking | fluctuation suppression material in the liquid-path type displacement meter of this embodiment. It is a top view which shows the other example of installation structure of the rocking | fluctuation suppression material in the water tank of the liquid path type displacement meter of this embodiment. It is a figure which shows Example 1 of the time transition simulation result of the water surface fluctuation | variation regarding the liquid-path type displacement meter of this embodiment. It is a figure which shows Example 2 of the time transition simulation result of the water surface fluctuation | variation regarding the liquid path type displacement meter of this embodiment. It is a top view which shows the whole structural example 2 of the liquid path type displacement meter in this embodiment. It is a sectional side view which shows the whole structural example 2 of the liquid-path type displacement meter in this embodiment.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an overall structure example 1 of an open channel displacement meter 100 (hereinafter the same) as a liquid channel displacement meter in the present embodiment, and FIG. 2 shows an open channel displacement meter 100 in the present embodiment. It is sectional drawing which shows the whole structure example 1. FIG. For the sake of explanation, the water tank 11 in FIGS. 1 and 2 transparently shows the rocking suppression material 30 and the sensor storage portion 19 provided therein.

  The open channel type displacement meter 100 according to the present embodiment is a displacement meter that can perform stable displacement measurement over a long period of time as usual and can also perform accurate vertical displacement measurement in a short time. Such an open channel type displacement meter 100 is configured by an open channel 25 formed by connecting a water tank 11 as a liquid tank disposed at a plurality of measuring points 10 provided at predetermined intervals by a water channel 20 as a liquid channel. Moreover, the water tank 11 of any one of the plurality of measurement points 10 is fixed to a solid foundation 2 or the like that does not cause vertical displacement, and becomes a reference point 10B when calculating the relative displacement amount between the measurement points. Yes. Further, the water tank 11 is integrally connected to the structure 1 that is the object of displacement measurement, and similarly shows the movement of the subsidence and the uplift along with the vertical displacement such as the subsidence and the uplift of the structure 1.

  Here, a sensor storage unit 19 is installed in the water tank 11 of each measurement point 10, and a swing suppression member 30 is installed in at least one of the water tank 11 or the water channel 20 of the measurement point 10. In the example of FIGS. 1 and 2, each water tank 11 is provided with a rocking suppression material 30. FIG. 3 shows an example of the structure of the open channel type displacement meter 100 in which the rocking suppression member 30 is installed. FIG. 3 is a plan view showing an example of the installation structure of the rocking suppression material 30 in the water tank 11 of the open channel displacement meter 100 of the present embodiment, and FIG. 4 shows the rocking motion in the water tank 11 of the open channel displacement meter 100 of the present embodiment. FIG. 6 is a cross-sectional view showing an example of the installation structure of the movement suppressing member 30. Here, a structure in which the rocking suppression member 30 is installed in the water tank 11 is shown. Moreover, sectional drawing of FIG. 4 is sectional drawing at the time of seeing the open water channel 25 shown in FIG. 3 from the AA direction.

  As shown in FIGS. 3 and 4, a water channel 20 is connected to the water tank 11 described above, and the water surface 13 of the water 12 stored in the internal spaces 18 and 21 communicating with each other is the same. Further, a box-shaped sensor storage portion 19 is provided in the inner space 18 of the water tank 11, and an eddy current sensor 16 is installed at the top end 15 thereof. The eddy current sensor 16 is a sensor that detects a vertical movement amount of the float 14 by taking a predetermined separation distance from the float 14 of the water surface 13 in the sensor storage unit 19. The general concept of displacement measurement in the eddy current sensor 16 is the same as that of the existing technology.

  In addition, the above-mentioned sensor accommodating part 19 with which each water tank 11 is provided covers the predetermined part 23A of the area | region 21A which the water 12 occupies among the opening 22A of the water path 20 connected with the water tank 11, as shown in FIG. The propagation path of the water 12 between 20 and the water tank 11 is obstructed by a predetermined ratio (for example, 15%). Alternatively, as shown in FIG. 5, a plate material 23 having a predetermined area is brought into contact with the opening 22A of the water channel 20 connected to the water tank 11, and a predetermined ratio of the region 21A occupied by the water 12 in the opening 22A of the water channel 20 (example) : 50%) and part of the propagation path of the water 12 between the water channel 20 and the water tank 11 can be assumed. In addition, about the above-mentioned structure illustrated in FIG. 4, 5, it employ | adopts as conditions in the simulation regarding the time transition of the water surface fluctuation mentioned later.

  Further, in the inner space 18 of the above-described water tank 11 in the present embodiment, the region 18A other than the sensor housing portion 19 has a rocking suppression material that blocks the cross section of the area 18A from the water tank bottom 18B to at least a predetermined height on the water surface 13. 30 is installed. As illustrated in FIG. 6, the swing suppressing member 30 is a member having a predetermined thickness formed by combining linear members 31 such as nylon fibers. For example, a nylon nonwoven fabric can be used. Nylon nonwoven fabric is readily available and low cost, and is a material that is easy to handle such as cutting into a desired shape and size, so that the swing suppression material 30 can be configured at low cost and simply.

  In the above-described rocking suppression material 30, the opening width and height of the openings 32 existing between the linear materials 31 are sufficiently larger than the diameter of the linear material 31 such as nylon fiber, and the line with respect to the opening 32 is The material 31 can be regarded as a line, not a surface. Therefore, the water 12 propagated and moved into the water tank 11 from the opening 22 </ b> A of the water channel 20 along with the water surface swing is not received as a surface when colliding with the rocking suppression member 30 in the water tank inner space 18. Therefore, the rate at which the water surface fluctuation is reflected toward the propagation source is small, and the water 12 flows into the opening 32 and smoothly passes through the fluctuation suppressing member 30.

  For example, the water 12 propagating and moving due to the water surface fluctuation generated in the water tank 11 or the like due to the displacement in the structure 1 reaches the rocking suppression member 30 in the inner space 18 of another water tank adjacent to the water tank 11 described above. Then, the linear member 31 in the swing suppressing member 30, that is, the wire 32 instead of the surface, is appropriately received and flows into the opening 32 (which is sufficiently larger than the diameter of the linear member 31). The water 12 that has flowed into the swing suppression member 30 through the opening 32 further collides with the linear material 31 entangled in the swing suppression member 30 to reduce energy, but the diameter is the same as that of the opening 32 described above. It follows the internal path 33 provided with and smoothly passes through the rocking suppression member 30.

  In this way, the rocking suppression member 30 absorbs the energy of the water 12 propagating and moving through the open channel 25 to calm the water surface rocking, and the propagation time lag generated before and after the rocking suppression material 30 in the aquarium space 18. Can be made to pass smoothly with a minimum of. Thus, the propagation of the water 12 with a small time lag leads to the quick propagation of the water level change accompanying the displacement of the structure 1 in the open channel 25. As described above, since the calming of the water surface in a short time and the rapid and accurate propagation of the water level change in the open channel 25 are established together, the open channel displacement meter of the present embodiment is established. 100 enables accurate vertical displacement measurement in a short time. This effect is particularly noticeable in situations where large water surface fluctuations are likely to occur due to sudden vertical displacement, such as when measuring displacement of the structure 1 such as during load transfer work when applying the underpinning method.

  In addition, you may install not only the case where the rocking | swiveling suppression material 30 is installed in the water tank 11 as mentioned above but in the water channel 20. In addition to the water tank 11 and the water channel 20 in the open channel 25, the swing suppression member 30 may be further provided at the end portions 26 and 27 of the corresponding open channel 25 (see FIG. 7). In this case, when the fluctuation of the water surface propagating in the open channel 25 reaches one of the open channel ends 26, the oscillation suppression member 30 of the open channel end 26 appropriately receives this to absorb energy, Reflection of water surface swing toward the open channel end 27 can be suppressed. According to this, the water surface swing in the open channel 25 is repeatedly reflected starting from the end portions 26 and 27 and does not calm down for a long time, avoiding a situation in which an excessive measurement time and a measurement result of inaccuracy occur. The vertical displacement measurement in the open channel displacement meter 100 in a short time can be made more accurate.

  Here, with respect to the conventional open channel displacement meter without the swing suppression member 30 and the open channel displacement meter 100 according to the present embodiment with the swing suppression member 30, the time transition of the water surface swing is simulated. An example is shown. First, the following five cases were adopted as cases for comparison.

Case 1 (conventional type): A configuration in which the rocking suppression material 30 is not provided in the water tank 11 of each measurement point 10. In addition, 15% of the area 21 </ b> A occupied by the water 12 in the opening 22 </ b> A of the water channel 20 connected to the water tank 11 is obstructed by the sensor storage unit 19.

Case 2 (conventional type): A configuration in which the rocking suppression material 30 is not provided in the water tank 11 of each measuring point 10. Of the opening 22A of the water channel 20 connected to the water tank 11, 50% of the region 21A occupied by the water 12 is covered and obstructed by a predetermined plate material or the like.

Case 3 (this embodiment): A rocking suppression material 30 is provided in the water tank 11 of each measuring point 10. In addition, 15% of the area 21 </ b> A occupied by the water 12 in the opening 22 </ b> A of the water channel 20 connected to the water tank 11 is obstructed by the sensor storage unit 19.

Case 4 (this embodiment): The rocking | fluctuation suppression material 30 is provided in the water tank 11 of each measuring point 10, and each of the open channel end parts 26 and 27. In addition, 15% of the area 21 </ b> A occupied by the water 12 in the opening 22 </ b> A of the water channel 20 connected to the water tank 11 is obstructed by the sensor storage unit 19.

Case 5 (this embodiment): A rocking suppression material 30 is provided in the water tank 11 of each measuring point 10. Of the opening 22A of the water channel 20 connected to the water tank 11, 50% of the region 21A occupied by the water 12 is obstructed by a predetermined plate material or the like.

  In addition, the assumed vertical displacement condition is that the nearest station 10 is raised 3 mm over 10 seconds at the open channel end 26. On the other hand, the other measuring points 10 and the water channel 20 are not displaced. Assuming a vertical displacement under such conditions, the water surface fluctuation of the water 12 in the water tank 11 that has risen with the rising of the measurement point 10 is propagated to the other measurement points 10 via the water channel 20 and the fluctuation suppression material 30. However, it is considered that the water surface 13 is flattened over time.

  The result at the time of applying the above conditions to each of the above cases 1 to 5 is shown in FIG. In the case of the example in FIG. 8, the displacement reaches 3 mm in each case at about 10 seconds after the time t = 0 when the above-described bulging started to occur. For a water channel displacement meter, each of t = 30 seconds, 1 minute 10 seconds, 1 minute 40 seconds, 2 minutes 10 seconds, 2 minutes 40 seconds, 3 minutes 10 seconds, 3 minutes 40 seconds, 4 minutes 10 seconds As a result, the displacement greatly fluctuates at the time, and finally it takes about 6 minutes for the amplitude of the displacement to settle down to about 0.1 mm, for example.

  On the other hand, regarding the open channel displacement meter 100 of this embodiment of cases 3 to 5, the displacement amount fluctuates at each time point of approximately t = 30 seconds and 1 minute and 10 seconds, but the amplitude of the displacement amount within about 2 minutes. Has settled down to about 0.1 mm. That is, with the open channel displacement meter 100 of the present embodiment provided with the swing suppression member 30, the water surface swing can be calmed down in a fraction of the time compared to the conventional open channel displacement meter. It will be.

  The above-mentioned vertical displacement condition is changed to a condition in which the nearest station 10 is raised by about 1 mm over one minute at the open channel end portion 26, and the results when applied to the above-described case 1 and case 4 are shown in FIG. 9 shows. In the case of the example in FIG. 9, the displacement reaches 0.9 mm in each case at about 1 minute after the time t = 0 when the bulging started to occur, and then the conventional open channel displacement meter of case 1 As a result, the displacement amount fluctuates at each time point of about t = 1 minute 20 seconds, 1 minute 40 seconds, 2 minutes 10 seconds, 2 minutes 40 seconds, and finally the amplitude of the displacement amount is about 0.1 mm. It takes about 3 minutes to calm down. On the other hand, with respect to the open channel displacement meter 100 of the present embodiment of the case 4, the displacement amount fluctuates at about t = 1 minute 10 seconds, but within about 1 minute 30 seconds, the amplitude of the displacement amount is 0.1 mm. It has calmed to the extent. In other words, even with respect to a gentle displacement, the open channel displacement meter 100 of the present embodiment provided with the swing suppression member 30 can swing the water surface in about half as compared with the conventional open channel displacement meter. It will be able to calm down.

  In the present embodiment, the liquid channel connected to the water tank as the liquid tank, that is, the opening of the water channel is blocked by 15% or 50% by the plate material 23, but the oscillation is suppressed even if it is not blocked at all. Needless to say, the material is effective.

  Further, as a liquid path type displacement meter in the present embodiment, as illustrated in FIGS. 10 and 11, a liquid path provided with a rocking suppression material 30 between each of the vertical liquid tanks 11 having a predetermined height. It is also possible to assume a liquid path type displacement meter 100 connected and configured at 20. In such a configuration, the pressure fluctuation of the liquid 12 caused by the liquid level fluctuation generated in a certain liquid tank 11 tries to propagate to the adjacent liquid tank 11 via the liquid path 20. Since energy is absorbed by the suppression member 30, the water surface swing can be converged more quickly than in the case where the swing suppression member is not installed.

  As described above, according to the present embodiment, the water surface fluctuation in the open channel displacement meter due to the vertical displacement generated in the structure is quickly converged, and the settled water surface can be accurately obtained in a short time in the open channel displacement meter. Vertical displacement measurement is possible.

  Although the embodiment of the present invention has been specifically described based on the embodiment, the present invention is not limited to this, and various modifications can be made without departing from the scope of the invention.

1 structure 2 foundation 10 measuring point 10B reference point 11 water tank (liquid tank)
12 Water (Liquid)
13 Water surface (liquid surface)
14 Float 15 Water tank top 16 Eddy current sensor 17 Base 18 Water tank inner space 18A Water tank inner space 18B Other than sensor housing section Water tank bottom 19 Sensor housing section 20 Water channel (liquid channel)
21 A in the water channel 21 A Water area 22 A of the water channel opening 22 A water channel opening 25 Open channel 26, 27 Open channel end 30 Swing suppression material 31 Linear material 32 Opening 33 Internal channel 100 Open channel displacement meter (liquid channel type) Displacement meter)

Claims (4)

  A liquid path type displacement meter configured by connecting a plurality of liquid tanks with liquid paths, wherein a rocking suppression material that suppresses rocking of the liquid surface is provided in at least one of the liquid tank or the liquid path. A liquid path type displacement meter provided.   The liquid path type displacement meter according to claim 1, wherein the rocking suppression material is configured by entwining a plurality of linear materials.   The liquid path type displacement meter according to claim 1, wherein the swing suppressing material is a nylon nonwoven fabric.   The liquid path type displacement meter according to any one of claims 1 to 3, wherein the rocking suppression material is further provided at an end of the liquid path.

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