JP2013181973A - Open channel type horizontal displacement gauge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that measurement of horizontal direction displacement of a plurality of measurement parts of structure on a non-straight line such as a radius base line by one system is not attained on structure of a reference immobile part which becomes a reference.SOLUTION: A float body floating in accumulated liquid in a liquid passage by constituting a plurality of displacement measuring parts in the middle is provided between immobile parts, one end of the float body is freely floatably supported by a first support part, the other end is freely floatably supported by a second support part, and a horizontal separation distance with the float body is measured by a proximity sensor provided at the respective horizontal displacement measurement parts.

Description

The present invention detects a horizontal displacement of a structure (tunnel, road, track, bridge, ground structure, etc.) existing or under construction in a part of the structure or a considerable area, and relatively reduces the displacement amount. The present invention relates to an open channel type displacement meter for measuring over a wide range.

Conventionally, as this type of measuring instrument, a reference line such as a wire is stretched between fixed points provided outside the area through a displacement prediction area for measurement purposes, and this is used as a fixed component to perform predetermined measurement. There is a configuration in which a non-contact displacement sensor such as a laser displacement meter is provided at a site, and a horizontal distance from the reference line is continuously measured by the laser displacement meter. When the predetermined measurement site is horizontally displaced, the distance between the laser displacement meter and the reference line of the displacement measuring unit is horizontally displaced accordingly, and this distance data is taken out by the laser displacement meter.

Patent 3399909

However, when a plurality of measurement parts of the structure are on the base line, measurement is possible only on a straight line because the measuring instrument needs to form a reference line stretched between fixed points. Accordingly, in such a field, measuring instruments configured to have a predetermined length are arranged (refilling method) along a plurality of rounded base lines, and measurement data is obtained by a conversion formula. This method cannot be an original fixed point structure, and therefore has a large data error. For the convenience of calculation, since it is configured to provide a displacement measurement unit at each measurement site, there are many non-contact displacement sensors. This requires a practical problem that it becomes necessary and the construction cost becomes remarkably high.

In order to solve the above-described conventional problems, in the present invention, a liquid path having a space above the stored liquid and disposed between fixed points, and a plurality of displacement measuring units 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 And a non-contact displacement sensor that measures the horizontal separation distance corresponding to the opposing position of the float body.

As a result, even if a plurality of measurement sites for performing horizontal displacement measurement are on the R-baseline, a single liquid passage and a float body are configured and installed along the R-baseline to achieve a plurality of target A displacement measurement unit can be provided at the measurement site. Of course, there is no problem that both ends of the float body are positioned as fixed points at points outside the measurement area according to the original measurement theory.

Therefore, in the present invention, a single open channel horizontal displacement meter can simultaneously measure a plurality of measurement parts on the R-baseline at the same time in the horizontal direction, so that the construction cost can be significantly reduced and a plurality of measuring instruments having a predetermined length can be realized. Compared with the conventional method in which data are obtained from calculated values by overlapping arrangement (so-called refilling method), it is possible to obtain extremely accurate data.

The top view and front view which show the attachment condition in the Example of this invention Detailed view of installation status in an embodiment of the present invention Detailed view of horizontal displacement measuring section in the embodiment of the present invention Detailed view of the first reference box in the embodiment of the present invention Detailed view of the second reference box in the embodiment of the present invention Detailed view of measurement main unit function in an embodiment of the present invention

This was realized by configuring a stationary structure as a reference for a plurality of measurements with a single float body floating in the stored liquid.

Hereinafter, embodiments for carrying out the present invention will be described as examples with reference to the drawings.
A first embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 1 denotes a road bridge for passing road traffic, and the lower structure is constituted by bridge piers 2 to 6. These bridge piers 2 to 6 are located along the arel base line in a plane. It is assumed that the piers 3, 4, and 5 are located in an area a (shown in FIG. 1) where a horizontal displacement is expected due to the influence of environmental changes such as excavation work. It is assumed that the piers 1 and 6 are out of the area a (shown in FIG. 1) and are outside the horizontal displacement influence range. Here, the description will proceed as a case of measuring the horizontal displacement of the piers 3, 4, and 5. A first reference box 7 is fixed to the outer surface of the pier 2. A first support 8 is provided in the first reference box 7. A second reference box 9 is fixed to the outer surface of the pier 6 so as to match the height of the first reference box 7. A second support portion 10 is provided in the second reference box 9.

Reference numeral 11 denotes a displacement measuring unit fixed to the outer surface of the pier 3 (the same level as the first and second reference boxes 7 and 9), and is configured in a box shape. Similarly, the displacement measuring unit 12 is fixed to the pier 4 and the displacement measuring unit 13 is fixed to the pier 5. The first reference box 7, the second reference box 9, and the displacement measuring units 11, 12, 13 described above are mounted on the base plate 14 shown in FIG. . Reference numeral 16 denotes, for example, a liquid pipe-shaped liquid passage, one end of which passes through the first reference box 7, and the intermediate portion sequentially passes through the displacement measuring units 11, 12, 13, for example, in a round shape, and the other end of the liquid passage. 2 reference boxes 9.

The liquid passage 16 is configured to communicate with the inner space of the first reference box 7, the displacement measuring units 11, 12, 13 and the second reference box 10, and the first reference box 7. The second reference box 9 and the displacement measuring units 11, 12, 13 are connected via a flexible portion 17 (for example, a rubber bellows). In the liquid path 16 and the first reference box 7, the second reference box 9, and the displacement measuring units 11, 12, 13, a stored liquid 19 (for example, water) is stored leaving an upper space. Reference numeral 20 denotes a float body that is housed in the liquid passage 16 through the displacement measuring units 11, 12, and 13, with one end located in the first reference box 7 and the other end located in the second reference box 9. is there. The float body 20 floats in the stored liquid 19, and therefore the structure thereof has a buoyancy with respect to the stored liquid 19 (for example, a sealed aluminum square pipe), and the intermediate portion is not in contact with other parts. It is configured as a shape along the round shape of the liquid passage 16 so that

Furthermore, the 1st support part 8 in the 1st reference | standard box 7 is supporting the one end part of the float body 20 so that floating is possible. For example, the roller shaft 21 is configured to be provided in a vertical direction so as to pass through one end portion of the float body 20 from the inner bottom surface of the first reference box 7, and supports one end portion of the float body 20 so as to be horizontally rotatable and floatable. It is like that. Moreover, the 2nd support part 10 in the 2nd reference | standard box 9 is supporting the other end part of the float body 20 so that it can slide and float in a longitudinal direction. For example, a rotatable turntable 22 provided in the horizontal direction on the inner bottom surface of the second reference box 9 and a pair of roller shafts 23 that are provided side by side with the turntable 22 in the vertical direction and gently hold the other end of the float body 20. The other end of the float body 20 is supported so as to be slidable and floatable in the longitudinal direction. Reference numeral 24 denotes a non-contact displacement sensor (for example, an eddy current sensor) that is provided on the inner walls of the displacement measuring units 11, 12, and 13 and measures the horizontal distance from the float body 20. A sensitive plate 25 is provided at a position corresponding to the proximity sensor 24 of the float body 20.
The sensitive plate 25 is a metal plate required when an eddy current sensor is used as the non-contact displacement sensor 24. The signal output of each non-contact displacement sensor 24... Is transferred to a data logger, a personal computer, etc. via a nearby amplifier box 26. Recorded over time.

Next, the operation of one embodiment of the present invention will be described. Assume that the piers 3, 4, and 5 are horizontally displaced in the direction of the arrow shown in FIG. The displacement measuring units 11, 12, and 13 fixed to the piers 3, 4, and 5 are also horizontally displaced by the same amount in the same direction. At this time, since the displacement measuring units 11, 12, and 13 are provided with the flexible portion 15 at the connecting portion with the liquid path 16, only the displacement measuring section 11, 12, 13 is displaced without deforming the liquid path 16. That is, the displacement measuring units 11, 12, 13 and the non-contact displacement sensors 24 provided thereon are displaced to positions indicated by dotted lines in FIG. At this time, the float body 20 is supported at the both ends by the first support portion 8 and the second support portion 10 that are outside the horizontal displacement influence range, and therefore maintains the initial position (functions as an immovable structure). . As a result, the non-contact displacement sensor 24 that has output the a distance (shown in FIG. 6) as the previous data outputs the b distance (shown in FIG. 6) as the subsequent data by a series of movements. Here, ba is obtained by each horizontal displacement measuring unit 11, 12, 13 as the actual horizontal displacement amount. In other words, the horizontal displacement amount of the piers 3, 4, and 5 can be obtained.

The horizontal displacement shown in FIG. 1 is in the direction of the arrow when each non-contact displacement sensor 24... Is attached in the radial direction from the center of the R base line of the liquid path 16, but each displacement measuring unit 11, 12, Of course, if it is desired to obtain data in 13 unified directions, the actual displacement can be obtained simply by correction calculation.

In this embodiment, the case where the plurality of displacement measuring units 11, 12, and 13 are on the base line is described, but the shape of the float body 20 is also provided when the plurality of displacement measuring units 11, 12, and 13 are on a straight line. It can be implemented without any problems by making a straight line. Moreover, although the 1st support part 8 was comprised by the roller shaft 21, and the 2nd support part 10 was comprised by the rotary table 22 and a pair of roller shaft 23, in Claim 1 of this invention, the 1st support part 8 is not limited as long as it supports one end of the float body 20 so as to float freely, and the second support portion supports the other end of the float body 20 so as to float freely. Adopted.

Here, depending on the material of the float body 20 and the field environment, the float body 20 itself may be deformed with a temperature change or the like depending on the material. The shape is expected to expand and contract in the longitudinal direction. Furthermore, it is predicted that the water level of the stored liquid 19 in the liquid passage 16 will change due to the change in temperature. In these cases, if both end portions of the float body 20 are completely fixed, an unexpected change occurs in the distance between each non-contact displacement sensor 24... And the sensitive plate 25. Will give a large error. In the embodiment of the present invention, in consideration of such a situation, the float body 20 is floatable (movable up and down) at both ends by the first support portion 8 and the second support portion 10 and is slidable in the longitudinal direction. Therefore, the above data error problem cannot occur, and very accurate data can be obtained.

Further, when the float body 20 is attached at the time of installation, the first and second reference boxes 7 and 9 are positioned in advance, so that it is considered that the float body 20 is brought into the second reference portion 10 with a deviation from the original direction. . Even in such a case, the pair of roller shafts 23 can be adjusted to the best direction by the turnable table 22 and can be supported without difficulty, and the floating environment of the float body 20 is not hindered (first). (Indicated by the alternate long and short dash line in FIG. 5).

Thus, a liquid path installed between the fixed points and constituting the displacement measuring unit in the middle, a stored liquid stored in the liquid path so as to form a space part on the water surface, and the liquid path are configured. A float body that floats in the stored liquid, a first support portion that supports one end of the float body in a rotatable and floating manner, a second support portion that supports the other end of the float body in a freely floating manner, and a liquid path And a proximity sensor for measuring a horizontal separation distance from the float body in the displacement measuring unit provided at a predetermined position.

As a result, even if a plurality of displacement measuring units that perform horizontal displacement measurement are on the R-baseline, one liquid passage and one float body are configured along the R-baseline and installed. A displacement measuring part can be provided in a plurality of measurement parts. Therefore, according to the present invention, a single open channel type horizontal displacement meter can simultaneously measure a plurality of measurement sites on the R-baseline, so that the construction cost is extremely low and calculation is performed by arranging a plurality of displacement meters in an overlapping manner. Compared with the conventional method of obtaining data by value, extremely accurate data can be obtained.

The open channel type horizontal displacement meter according to the present invention has been described for measuring the horizontal displacement of a plurality of bridge piers arranged on the base line of a road bridge as in the above embodiment, but is not limited thereto. The measurement target is suitable for measuring multiple points on the R-baseline of any structure such as track ground, existing or under construction tunnels, roads, urban structures, etc. It can be used as a simple measuring device.

DESCRIPTION OF SYMBOLS 1 Road bridge 2-6 Bridge pier 7 1st reference box 8 1st support part 9 2nd reference box 10 2nd support part 11-13 Displacement measurement part 14 Base plate 15 Wall surface mounting jig 16 Liquid path 17 Flexible part 19 Stored liquid 20 Float body 21 Roller shaft 22 Rotary table 23 A pair of roller shafts 24 Non-contact displacement sensor 25 Sensing plate 26 Amplifier box

Claims (2)

A liquid path that is installed between fixed points and has a space above the stored liquid, a plurality of displacement measuring units that are arranged in the middle of the liquid path via flexible parts, and that is provided along the liquid path and floats on the stored liquid. A float body passing through each displacement measurement section, first and second support sections that support both ends of the float body in a freely floating manner, and a horizontal separation distance corresponding to the opposing position of the float body provided in each displacement measurement section An open channel type horizontal displacement meter characterized by comprising a non-contact displacement sensor for measuring the pressure. The first support portion is configured by freely penetrating one end portion of the float body in the vertical direction with a roller shaft, and the second support portion is sandwiched in the horizontal direction with the other end portion of the float body by a pair of roller shafts. 2. The open channel type horizontal displacement meter according to claim 1, wherein the horizontal displacement meter is configured.

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