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DESCRIPTION JPH0518188

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DESCRIPTION JPH0518188
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
soil discrimination apparatus for a small diameter pipe propulsion device capable of instantly
discriminating the soil quality of excavated soil.
[0002]
2. Description of the Related Art In a small-diameter pipe propulsion unit in which a smalldiameter pipe is conventionally buried in the ground, a small-diameter pipe fitted with a tip end
at its tip is propelled into the ground by a propulsion device installed in a start shaft. A cutter
head is provided at the tip of the tip conduit for digging the face. The earth and sand excavated
by the cutter head are discharged to the bucket installed in the start shaft by a screw conveyor
provided in the front conduit and the small diameter pipe, and then carried out to the ground.
[0003]
In the above small diameter pipe propulsion unit, it is necessary to determine the soil texture of
the face to be excavated in order to embed the small diameter pipe accurately along the planned
line. For this reason, conventionally, the soil quality of the face currently being excavated by the
cutter head has been determined from the soil discharged from the screw conveyor into the
bucket.
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[0004]
[Problems to be solved by the invention] However, if the soil quality of the face is uniform and
the propulsion distance is relatively short, the soil quality of the face can be determined by the
above method, but the promotion and promotion in the formation where the soil quality of the
face changes When the distance is long, the soil quality of the face currently being excavated and
the soil quality of the soil discharged into the bucket from the screw conveyor often do not
match, so the method of examining the soil quality of the soil discharged into the bucket is a
propulsion device In the operation of the above, there were problems such as the impossibility of
propulsion and the inability to accurately bury small diameter pipes along the planned line. The
present invention has been made for the purpose of improving the above-mentioned problems,
and an object of the present invention is to provide a small-diameter pipe propulsion device in
which the soil quality of soil immediately after excavating a cutter head can be determined
instantly.
[0005]
[Means for Solving the Problems] In order to achieve the above object, the present invention
embeds a small diameter pipe having a tip conduit mounted at its tip into the ground by means
of a propulsion device installed at a start shaft, and In a small-diameter pipe propulsion device in
which a cutter head provided at the tip of a conduit carries soil excavated soil backward by a
screw conveyor, vibration acceleration of soil conveyed in the casing of the screw conveyor in the
above-mentioned conduit A vibration acceleration sensor is provided to detect the soil quality of
the face being excavated from the signal detected by the vibration acceleration sensor.
[0006]
Since the soil quality of the face immediately after the cutter head is excavated can be instantly
determined by the above configuration, the operation of the small diameter pipe propulsion
device can be properly performed based on the obtained information.
[0007]
An embodiment of the present invention will be described in detail with reference to the
drawings.
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FIG. 1 shows an overall view of a small diameter pipe propulsion device, and in this figure, 1
shows a propulsion device installed in a start shaft 2.
The above-mentioned propulsion device has at its tip a propulsion jack 5 for propelling the smalldiameter pipe 4 fitted with the front conduit 3 into the ground, and also has a drive device 7
driven by a hydraulic motor 6; The cutter head 9 at the tip of the leading conduit 3 is driven by
the driving device 7 through the screw shaft 8 a of the screw conveyor 8 provided in the small
diameter pipe 4 and the leading conduit 3.
[0008]
The soil excavated by the cutter head 9 is taken into the casing 8b of the screw conveyor 8 and
then transported to the start shaft 2 by the screw shaft 8a and discharged into the bucket 10 in
the start shaft 2 as appropriate. It is carried out to the ground by means. On the other hand, in
the figure, reference numeral 12 denotes a main body of the soil discrimination apparatus
attached via the bracket 13 to the outer peripheral surface of the casing 8b of the screw
conveyor 8 provided in the front conduit 3 to detect vibrational acceleration of soil transported
in the casing 8b. The vibration acceleration sensor 14 is provided.
[0009]
That is, although the earth and sand taken into the casing 8b of the screw conveyor 8 are
conveyed by the screw shaft 8a, at this time, vibration acceleration is generated in the earth and
sand. The vibration acceleration changes depending on the soil quality. For example, since the
fine grain component soil quality is smoothly transported by the screw shaft 8a, a vibration
acceleration of a frequency as shown in FIG. 5 (a) is generated. In the case, vibrational
acceleration as shown in FIG. 5 (b) and vibrational acceleration as shown in FIG. 5 (c) are
generated in the case of clay. Further, when there is no earth and sand in the casing 8b, it is as
shown in (d) of FIG. In each of these figures, the horizontal axis represents frequency, and the
vertical axis represents frequency component level.
[0010]
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The vibration acceleration, which changes depending on the soil quality, is detected by the
vibration acceleration sensor 14 attached to the outer peripheral surface of the casing 8b and
amplified by the amplifier 15 shown in FIG. 4 incorporated in the printed circuit board 12b in the
rear case 12a. It is input to the arithmetic circuit 17 via the same. The filter 16 is supplied with a
sweep signal corresponding to the soil from the sweep signal generation circuit 18, and
frequency components of the vibration acceleration signal input to the filter 16 are subjected to
frequency analysis for each frequency range.
[0011]
Then, the signal whose frequency has been analyzed over the entire band is calculated by the
arithmetic circuit 17 using a linear equation having a constant weight in advance to calculate the
signal level of each band. At this time, an offset function 19 subtracts a vibration acceleration
component (a noise component generated when the casing 8b and the screw shaft 8a contact
each other) which is not related to the soil contained in the signal component. The vibration
acceleration calculated as described above is sent to the soil gauge 22 of the control panel 21
installed in the start shaft 2 or on the ground by the cable 20 wired in the small diameter pipe 4.
[0012]
Next, the operation will be described. As the small diameter pipe 4 is propelled into the ground
by the propulsion device 1 installed in the start shaft 2, the counterhead of the front conduit 3
mounted at the tip of the small diameter pipe 4 9 excavates a face in front of the front conduit 3.
The soil excavated by the cutter head 9 is taken into the casing 8b of the screw conveyor 8 and
then transported backward in the casing 8b by the screw shaft 8a, but the vibration acceleration
generated in the soil during transport is the vibration acceleration It is detected by the sensor 14.
[0013]
Then, as this signal passes through the filter 16, the frequency is analyzed for each frequency
range and sent to the arithmetic circuit 17. In the arithmetic circuit 17, the signal level of each
band is calculated by a linear expression having a constant which has been weighted beforehand.
For example, when the face currently being excavated is fine grain component soil S1, the
average signal level in each of the f1, f2 and f3 bands is 0.7, 0.2 and 0.1 as shown in (a) of FIG. +
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5 × 0.2 + 7.5 × 0.1 = 3.5 is calculated, and the noise component ΔL (2.5 × 0.1 + 5 × 0.1 + 7.5
× 0.2 = 2.25) calculated from (d) of FIG. 5 is subtracted from this value.
[0014]
That is, 3.5-2.25 = 1.25 is computed by the computing circuit 17 and sent to the soil gauge 22.
The soil gauge 22 is pre-marked S1, S2 and S3 for each soil type, and in the above case the
needle 22a of the soil gauge 22 indicates S1, so by looking at this soil gauge 22, we are currently
digging The soil texture of the face can be identified as a fine grain component soil texture.
[0015]
Similarly, when the soil is a fine-grained component, 2.5 x 0.2 + 5 x 0.7 + 7.5 x 0.3 = 6.25 is
calculated from (b) in Fig. 5, and the noise component 2.25 is further subtracted to calculate Do.
The soil gauge 22 indicates soil quality S2 from this calculated value 4. In the case of clay
texture, 2.5 x 0.2 + 5 x 0.3 + 7.5 x 0.8 = 88-2.25 = 5.75 is calculated from (c) in the figure, and
this value is 5.75. As a result, the soil gauge 22 displays the soil quality S3. The soil quality signal
can be expressed by the following equation.
[0017]
In the above equation, the band weighting numbers W1 ... f1 band weighting numbers W2 ... f2
band weighting numbers W3 ... f3 band weighting numbers Wk ... fk band weighting numbers or
bands f1, f2, f3 , F k and the signal levels L 1, L 2, L 3 and ΔL are shown in FIG.
[0018]
As described in detail above, the present invention detects soil quality from soil immediately after
being excavated by a cutter head, so that soil quality of the face being excavated can be
determined instantaneously and accurately. become able to.
As a result, since the timing of soil removal such as a pinch valve provided on the screw conveyor
can be accurately operated, problems such as clogging of the inside of the screw conveyor with
earth and sand making the propulsion difficult will not occur. In addition, since the promotion
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according to the soil quality can be appropriately performed, the efficiency of the promotion
work can be improved, and the small diameter pipe can be buried accurately along the planned
line.
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