JP3859092B2 - Key bearing measuring instrument for installation case for underground observation equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides an installation case of an observation device installed at the bottom of an observation well with a key that fits into a key groove formed in an underground observation device and sets the installation orientation of the observation device on the inner surface. The present invention relates to an orientation measuring instrument for measuring the orientation of the key.
[0002]
[Prior art]
Underground-type observation devices such as seismometers and inclinometers need to be installed with the detection sensitivity direction set to a specific direction, for example, the sensitivity axis in the east-west direction or the north-south direction.
However, it is extremely difficult to install an observation device with the sensitivity axis in a predetermined direction at the bottom of a deep observation well of 50m or more.
[0003]
In general, in order to install an observation apparatus with its sensitivity axis aligned in a predetermined direction, the following means are taken. First, an installation case having a key (the key groove of the observation device is fitted to this key to set the orientation of the observation device) is buried in the deep hole bottom where the observation device is installed, and fixed with concrete. As a matter of course, it is unclear which direction the key is oriented at this time.
[0004]
Therefore, in order to measure the direction (direction) of this key, a cylindrical azimuth measuring instrument having a magnetic groove compass (or gyrocompass) and a key groove that can be fitted to the key at the lower end is provided at the bottom of the hole. Measure the azimuth when the key groove on the same orientation measuring instrument is fitted to the key on the installation case with a magnetic orientation compass (or gyrocompass), and measure the orientation of the key provided on the installation case Is doing.
[0005]
After adjusting the sensitivity axis of the observation device based on the measured key orientation, the observation device is lowered into the installation case at the bottom of the hole, and the key of the installation case is fitted into the key groove of the observation device. An observation device is installed in the observation well with the sensitivity axis of the device aligned in a predetermined direction.
[0006]
[Problems to be solved by the invention]
By the way, in the key direction measuring instrument as described above, confirmation that the key groove of the direction measuring instrument is fitted to the installation case, conventionally, after painting the key groove, the direction measuring instrument is lowered to the bottom of the hole, This is collected on the ground, and it is confirmed whether or not the key groove is rubbed against the key when the paint color is peeled off.
[0007]
However, in this method, the degree of paint peeling and the degree of familiarity with the key groove differ depending on the type of metal constituting the orientation measuring instrument, the type of paint, or the degree of fitting to the key (for example, the fitting speed and fitting direction). Therefore, there is a problem that reliability is poor.
The present invention is intended to provide a key orientation measuring instrument for an installation case for an underground observing apparatus that solves such problems.
[0008]
[Means for Solving the Problems]
The present invention relates to an azimuth measuring instrument for measuring the azimuth of a key protruding from the inner surface of a cylindrical installation case for installing an underground observation device installed at the bottom of an observation well. A key groove that can be inserted from above is formed, and a metal wire is stretched under the key groove to solve the problem.
[0009]
Further, the direction of the key can be measured by an azimuth meter attached to the cylindrical main body as a means for solving the problem.
[0010]
Further, after the columnar body is fitted into the cylindrical installation case and collected on the ground, it is determined whether the key of the cylindrical installation case is fitted into the keyway of the columnar body from the state of the metal wire. As a means to solve the problem.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a key orientation measuring instrument of an installation case for an underground buried observation apparatus as an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view thereof, FIG. 2 is a bottom view thereof, and FIG. FIG. 4 is a longitudinal sectional view, and FIG. 4 is a sectional view taken along the line BB in FIG.
[0012]
In FIG. 1, reference numeral 10 denotes a columnar body of the orientation measuring instrument. The columnar body 10 is formed of a columnar body having a diameter that can be smoothly fitted to the cylindrical installation case 20 from above. A key groove 11 into which a key 21 (see FIGS. 3 and 4) protruding from the installation case 20 can be fitted is formed in the lower peripheral surface portion.
[0013]
The keyway 11 is formed parallel to the axis AA of the main body 10 and has a depth substantially the same as (or slightly deeper than) the height a of the key 21.
[0014]
Further, in order to form the eight-shaped guide surfaces 12 and 12 that are continuous with the lower part of the key groove 11 and have substantially the same depth as the key groove 11 on the peripheral surface of the main body 10, A fan-shaped concave portion 13 formed by cutting into a shape is formed. Each guide surface 12, 12 is formed in an inclined shape in which the distance between the two expands downward, and the pair of left and right guide surfaces 12, 12 forms an eight-shaped key guide portion.
[0015]
A compass (for example, a magnetic compass or a gyrocompass) 14 is attached to the main body 10.
In addition, the above-mentioned structure is the same as that of the conventional azimuth measuring instrument.
[0016]
In this embodiment, a thin metal wire (for example, a thin copper wire) 15 is stretched under the key groove 11 of the main body 10 of the azimuth measuring instrument configured as described above.
The installation case 20 is installed (fixed) at the bottom of the observation well, and an underground buried observation device (not shown) is installed in the installation case 20 later.
[0017]
In use, the azimuth measuring instrument having the above-described configuration is lowered from above the installation case 20 fixed to the hole bottom.
A rod 16 is fixed to the upper part of the main body 10, and the lowering of the main body 10 is performed via the rod 16.
[0018]
When the main body 10 is lowered to the vicinity of the lower bottom portion of the installation case 20, the guide surface 12 of the main body 10 comes into contact with the key 21 projecting near the lower bottom portion of the installation case 20. When the keyway 11 and the key 21 are on the same vertical line, the key 21 directly fits into the keyway 11 without contacting the guide surface 12, but such a case is almost impossible.
[0019]
When the main body 10 is further lowered, the contact point on the inclined guide surface 12 with respect to the key 21 moves. That is, the main body 10 rotates as it descends. In order to allow this rotation, the rod 16 is rotatably attached to a main body lowering mechanism (not shown). When the key 21 is aligned with the key groove 11, the key 21 is fitted (fitted) into the key groove 11, and when the key 21 enters the upper end of the key groove 11, that is, when both are completely fitted, the main body 10 The descent stops.
[0020]
When the key 21 is fitted (fitted) into the key groove 11, the metal wire 15 stretched under the key groove 11 is cut.
[0021]
Then, the azimuth of the main body 10 with the key 21 fitted in the keyway 11 of the main body 10 is measured by the azimuth meter 14, and the azimuth of the main body 10, that is, the azimuth of the key 21 is transmitted to the ground via a cable (not shown). The
[0022]
After the above operation, the main body 10 is collected on the ground. Then, by checking whether or not the metal wire 15 is cut, whether or not the key 21 of the installation case 20 is fitted in the key groove 11 of the main body 10 by the lowering operation to the installation case 20 of the orientation measuring instrument described above. Judgment is made.
[0023]
When the metal wire 15 is cut, it is determined that the measurement result of the compass 14 is an accurate orientation. If not cut, the above operation is performed again.
[0024]
In this way, the orientation of the key 21 of the installation case 20 buried in the ground can be confirmed. And, by setting the sensitivity axis of the underground buried type observation device based on the direction of the key 21 obtained in this way, the sensitivity axis of the observation device is installed in the observation well according to the predetermined direction Can do.
[0025]
【The invention's effect】
As described in detail above, according to the key orientation measuring instrument of the installation case for an underground observation device of the present invention, measurement of the key orientation that is installed in the observation well and sets the orientation of the installation of the underground observation device When the azimuth measuring instrument is fitted to the installation case protruding from the inner surface of the key, the azimuth measuring instrument is collected and the state of the metal wire stretched under the key groove is inspected. The advantage is that it can be confirmed accurately with a simple operation.
[Brief description of the drawings]
FIG. 1 is a front view of a key azimuth measuring instrument of an installation case for an underground observation device according to an embodiment of the present invention.
FIG. 2 is a bottom view of the same.
FIG. 3 is a longitudinal sectional view of an installation case.
4 is a cross-sectional view taken along the line B-B in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Cylindrical body 11 of direction measuring instrument 11 Key groove 12 Inclined guide surface 13 Fan-shaped recessed part 14 Direction meter 15 Thin metal wire 16 Rod 20 Cylindrical installation case 21 Key

Claims (3)

An orientation measuring instrument that measures the orientation of the key projecting from the inner surface of a cylindrical installation case for the installation of underground observation equipment installed at the bottom of the observation well can be inserted into the cylindrical installation case from above A cylindrical body and a key groove capable of fitting the key to the peripheral surface of the cylindrical body is formed, and a metal wire is stretched under the key groove. Key bearing measuring instrument for installation case for underground observation equipment. 2. The key azimuth measuring instrument for an installation case for an underground buried observation apparatus according to claim 1, wherein the azimuth of the key can be measured by an azimuth meter attached to the cylindrical main body. The columnar body is recovered after being fitted into the cylindrical installation case, and it is determined whether the key of the cylindrical installation case is fitted in the keyway of the columnar body from the state of the metal wire. The key azimuth measuring instrument for an installation case for an underground observing apparatus according to claim 1 or 2, wherein

Images