JP3363435B2 - Tunnel excavation method and tunnel excavation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention ejects a jet water stream toward an object to be excavated in the ground, and detects the crushing sound of the object to be excavated based on the jet to determine whether the object to be excavated is an obstacle. The present invention relates to a tunnel digging method and a tunnel digging device for diagnosing whether or not to dig a tunnel based on the diagnosis result.

[0002]

2. Description of the Related Art Conventionally, as a tunnel excavation method, a shield construction method and a propulsion construction method using a sealed excavator (sealed excavation machine) are known. The shield construction method and the propulsion construction method are used for various constructions such as excavation of a tunnel in a mountainous area, excavation of a tunnel crossing a river bottom, and excavation of a long-distance tunnel in an urban area.

In this type of tunnel excavation construction plan,
A geological survey (soil investigation) is performed between the starting point and the ending point of the excavation, and several points on the excavation route (excavation route, excavation plan line) that connects the excavation start point to the excavation end point are picked up, and the geology of the several points By conducting an investigation, the soil or ground to be excavated in the ground on the excavation route is determined, the construction method is selected, and the closed-type excavation machine is selected, and the actual construction is performed.

However, during excavation, an unpredictable object to be excavated, for example, an obstacle such as boulders, bedrock, driftwood, or the like may be encountered, and if such an obstacle is present, it is difficult to continue excavation as planned. Therefore, we were forced to re-examine the construction plan itself, prolonging the construction period, and eventually
This will lead to a significant increase in construction costs.

In particular, Japan is a volcanic country, has many mountains and rivers, has a complicated topography, and has many places where the soil quality changes abruptly. Therefore, the soil ground is judged only by the geological survey. Is difficult Also, in the case of urban construction,
Due to the large number of roads, it is limited to pick up several points on the excavation route to conduct a geological survey, and in reality, the excavation start point and the excavation end point must be constructed by two geological surveys. It is difficult to predict what kind of obstacle exists in the course of the excavation from the end to the end of excavation.
Even in a construction plan for crossing a river floor, it is difficult to conduct a geological survey within the river, and it is also difficult to predict obstacles.

Further, the geological survey method is also a survey by boring, and it is difficult to grasp the soil properties. The budget of geological survey is also limited. It may be possible to judge the soil quality from the crushed material during excavation, but since the excavation face cannot be seen with a closed-type excavating machine, the soil properties cannot be grasped and the excavation face, which is important for construction management, may be damaged. It can happen.

Therefore, a method of judging the geology by the electric survey from the ground has been proposed, but this method cannot be used in a river, and in the case of uniform soil, it is possible to measure it to some extent by measuring over a wide range. Although it is possible to judge obstacles of different sizes, it is difficult to judge obstacles such as buried pipes, and if electric exploration is conducted over the entire construction section, construction costs will increase significantly. . In addition, real-time geological measurement is not possible during excavation.

On the other hand, acoustic emission (acoustic diagnosis) for judging the sound generated on the excavation face during excavation
Methods have also been proposed.

[0009]

As shown in FIG. 1, a tunnel excavation method by an excavating machine using the acoustic diagnosis is provided behind the cutter face plate 2 of the excavating machine 1 and cooperates with the cutter face plate 2. Then, an acceleration sensor 5 is attached to a partition wall 4 that constitutes the closed chamber 3, and an audible band (for example, 10 KHz or less) generated when a cutter 9 encounters an obstacle such as a bedrock 6, boulder 7, driftwood 8 or the like. Sound of the frequency band) is detected by the acceleration sensor 5, and a sound detection signal output from the acceleration sensor 5 is detected by a frequency band pass filter (not shown) of the sound monitor device 11 installed in the central control unit room 10. Process the speaker 12
The voice is converted back into voice by the operator so that the operator can hear the sound, and the oscilloscope 13 displays the waveform of the sound detection signal in order to visualize it.

Further, as a method of tunnel excavation by the excavation machine 1 using the acoustic diagnosis, there is a method in which the acceleration sensor 5 is directly attached to the cutter face plate 2. According to the tunnel excavation method using the excavation machine 1 using this acoustic diagnosis, the operator can determine the excavation status while listening to the sound emitted from the speaker 12, and thus the geology can be determined in real time.

That is, according to the tunnel excavation method by the excavating machine 1 using this acoustic diagnosis, the sound of the electric motor of the excavating machine 1, the change in the sound due to the abrasion of the cutter face plate 2 (disk cutter), the change to the cutter face plate 2 Judgment of abnormal sound of excavating machine 1 such as sedimentation of sand, running out of oil in excavating machine 1, viscosity, sand layer, boulders, driftwood, underground obstacles such as metal objects, hard rock layer, soft rock layer, alternate ground, etc. It is possible to judge the soil property by distinguishing the cutting noise caused by the cutter or by looking at the oscilloscope 13.

However, in this conventional method, as shown in FIG. 2, the cutter face plate 2 advances while excavating while rotating. Therefore, when a boulder 7 as an obstacle is encountered, any one of the cutter face plates 2 is encountered. The cutting noise when the cutter abuts the boulder 7 is detected, and which cutter is the boulder 7
There is a problem that the size and position of the boulder 7 cannot be determined because it is not possible to distinguish acoustically whether it is in contact with.

Further, in the case of the alternating ground in which the bedrock (used as a concept including the hard soil layer) 6 and the soft soil layer 14 are mixed, the judgment is probably sensuous, and therefore the obstacles such as boulders 7 Since it is difficult to distinguish between them and their size and position, it is necessary to advance the excavation machine 1 according to the construction plan and continue excavation in order to accurately determine whether or not the ground is an alternating layer. As a result, as shown in FIG. 3, the excavation machine 1 rides on the bedrock 6 and the excavation direction 15 by the excavation machine 1 and the excavation direction 16 by the construction plan are deviated from each other, or in FIG. As shown, there is a problem that a part of the soft soil layer causes a depression 17.

According to this conventional method, it is difficult to accurately determine the position, size, etc. of the underground obstacle to the extent that it is possible to determine the presence of large boulders existing in soft soil and the abnormal situation of the excavating machine as a whole. There is a problem.

The present invention has been made in view of the above circumstances, and its purpose is to accurately determine the size and position of an obstacle existing in the ground by using an acoustic diagnosis method. A tunnel excavation method and a tunnel excavation device capable of excavating a tunnel while being provided.

[0016]

According to a first aspect of the present invention, there is provided a jet injection nozzle from a radially inner side of a cutter face plate of a drilling machine toward a radially outer side thereof, and an object to be excavated while rotating the cutter face plate. By jetting a jet water stream from each jet jet toward the jet, and detecting the crushing sound of the excavation target based on the jet, it is determined whether the excavation target is an obstacle and the size and position of the obstacle are determined. It is a tunnel digging method characterized by digging while making a judgment.

According to a second aspect of the present invention, a jet water flow is jetted from one of the jet jet nozzles while the cutter face plate is rotated once while the progress of the excavating machine in the excavating direction is stopped, and a crushing noise is generated. By determining whether or not the obstacle exists on the rotation trajectory of the jet injection nozzle, and then while making one rotation of the cutter face plate, one of the remaining jet injection nozzles The jet sound is ejected from the jet jet to detect the spalling sound, thereby determining whether or not the obstacle exists on the rotation trajectory of the jet jet nozzle, and detecting the spalling sound caused by the jet water jet of the jet jet nozzle. The ton according to claim 1, wherein the shape of the obstacle is determined by performing the rotation trajectory of each jet injection nozzle. A Le excavation method.

According to a third aspect of the present invention, the shape of the obstacle in the advancing direction is determined by ejecting a jet water flow from each jet injection nozzle while advancing the excavating machine in the advancing direction. The tunnel excavation method according to claim 1.

The invention according to claim 4 is the tunnel excavation method according to claim 1, wherein the obstacle is crushed by the jet water flow. According to a fifth aspect of the present invention, a jet injection nozzle that is provided on the cutter face plate of the excavating machine at a predetermined interval from the inner side in the radial direction to the outer side in the radial direction and injects a jet water flow toward the object to be excavated, A detection sensor that is provided on at least one of the partition wall that forms a closed chamber in cooperation with the cutter face plate and the cutter face plate, and that detects a crushing sound based on the jet water jet injection of the excavation target, and the jet injection nozzle It is a tunnel excavation device having display means for displaying a rotational position and a radial position of the jet injection nozzle.

According to a sixth aspect of the present invention, the display means draws a contour line in a direction orthogonal to the traveling direction of the excavation target based on the detection of the crushing sound at the rotation angle position of the jet injection nozzle. The tunnel excavation device according to claim 5.

According to a seventh aspect of the invention, the display means detects the crushing sound by the jet injection nozzle from the inner side in the radial direction to the outer side in the radial direction while the excavating machine is in progress, and the advancing direction of the excavating object. 6. The tunnel excavation device according to claim 5, wherein the contour line shape is drawn.

According to an eighth aspect of the present invention, the display means is provided in a central control unit room, and a speaker which reconverts the output of the detection sensor into a sound and emits the output, and the detection unit. The tunnel excavation device according to claim 5, further comprising an oscilloscope for visualizing the output of the sensor.

According to a ninth aspect of the present invention, there is provided the tunnel boring device according to the fifth aspect, wherein the detection sensor is an acceleration sensor.

[0024]

FIG. 5 shows a front view of a cutter face plate of an excavating machine used in a tunnel excavation method and tunnel excavation device according to the present invention, in which 20 is a cutter face plate and 21 is a cutter. The outermost cutter 21 in the radial direction is a so-called gauge cutter, and the cutter existing radially inward of the gauge cutter is a so-called cutting bit.

The cutter face plate 20 is provided with jet injection nozzles 23 to 26 at regular intervals in the radial direction from the rotation center shaft 22. Further, as shown in FIG. 8, a well-known acceleration sensor (detection sensor) 29 is provided on the partition wall 28 that is provided behind the cutter face plate 20 of the excavating machine 1 and cooperates with the cutter face plate 20 to form the closed chamber 27.
Is provided. This acceleration sensor is composed of a PZT ceramics element, generates an electric signal proportional to the vibration acceleration by its piezoelectric effect, and acoustic vibration of the partition wall 28 based on the driving sound of the machine and acoustic vibration of the partition wall 28 based on the excavation sound of the excavation target. The acoustic vibration of the partition wall 28 due to the crushing sound of the excavation target based on the jet water jet injection described later is output to the central control unit room 30 as an acoustic detection signal.

The waveform pattern and the amplitude level of the acoustic detection signal have a certain correspondence with the hardness of the ground as an excavation object. For example, in the case of soft ground such as cohesive soil layer, the excavation sound is small and the rock layer The sound of excavation becomes louder, and the sound of excavation changes randomly in the ground where many gravel and rock fragments exist. Therefore, by listening to the sound emitted from the speaker described below or by looking at the waveform of the oscilloscope described below, it is possible to intuitively determine in real time what the excavation target is.

The excavating machine 1 has a central control unit room 30.
Operated by the operator. The central control unit room 30
In addition to the sound monitor device 11, the speaker 12, and the oscilloscope 13 described in the related art, a display device (display means) 31 is provided.

As shown in FIG. 6, a nozzle position display screen 32 corresponding to each of the jet injection nozzles 23 to 26 is displayed on the display device 31. This nozzle position display screen 32 shows the injection point 2 indicating the position of the jet injection nozzle 23.
3b, a locus circle 24a indicating the rotation locus of the jet injection nozzle 24, an injection point 24b indicating the rotational direction position of the jet injection nozzle 24, a locus circle 25a indicating the rotation locus of the jet injection nozzle 25, and the rotation of the jet injection nozzle 25. Jet point 25b indicating the directional position, jet jet nozzle 2
6, a locus circle 26a indicating the rotation locus of No. 6, an injection point 26b indicating the rotational direction position of the jet injection nozzle 26, and numerical values for indicating the rotational direction positions of the jet injection nozzles 24 to 26 in degrees with the reference direction being 0 degree. It is displayed.

The tunnel excavation method using the excavation machine 1 according to the present invention has its jet injection nozzles 23 to 26.
The jet water is jetted from the jet toward the excavation target, and the crushing sound of the excavation target based on the jet water flow is acoustically diagnosed to judge whether there is an obstacle or the like in the ground and to proceed with the excavation. .

The pressure of the jet jet water jets jetted from the jet jet nozzles 23 to 26 is, for example, 100 MPa to
Ultra high pressure water of 250 MPa. The acoustic diagnosis is performed by stopping the progress of the excavation machine 1, rotating the cutter face plate 20 at a low speed, and jetting the jet nozzles 23 to 2.
A switching valve (not shown) for switching and supplying the ultra-high pressure water to 6 is appropriately selected, and the crushing sound generated when the jet water jets are individually jetted to the obstacle is detected.

That is, as shown in FIGS. 7 and 8, it is assumed that a boulder 7 as an obstacle exists ahead of the excavation direction. In this case, the movement of the excavation machine 1 in the excavation direction is stopped, and first, the jet face plate 20 is rotated once while jetting the jet water flow from the jet jet nozzle 23. From this, it can be confirmed that there is an obstacle such as the boulder 7 in the forward direction of the excavation. Next, jetting of the jet water flow by the jet jet nozzle 23 is stopped, the jet water flow is jetted from the jet jet nozzle 24, and the cutter face plate 20 is rotated once to the right or left direction at a low speed. As a result, it can be seen that the obstacle exists from about 45 degrees to about 240 degrees. Next, jetting of the jet water flow by the jet jet nozzle 24 is stopped, the jet water flow is jetted from the jet jet nozzle 25, and the cutter face plate 20 is rotated once and rotated at a low speed. From this, it can be seen that an obstacle exists from about 60 degrees to about 200 degrees. After that, the jet water jet from the jet jet nozzle 25 is stopped, the jet water jet is jetted from the jet jet nozzle 26, and the cutter face plate 20 is rotated once and rotated at a low speed. From this, it can be seen that there is an obstacle extending from about 170 degrees to about 185 degrees.

Since the radial direction position and the rotational position of the jet injection nozzle 23 are known, the rotational direction position of the jet injection nozzle 23 at the boundary point where the crushing sound is obtained is connected by a contour line. , As shown in FIG.
As the initial data, the contour line 33 of the obstacle is obtained.

Based on this initial data, the operator uses the injection nozzles 25 and 26 to give an instruction for primary crushing of the obstacle. The jet of the jet water flow causes cracks or the like in the obstacle.

Then, while the excavation machine 1 is advanced at a point 250 mm from the initial position, acoustic diagnosis by jet injection is performed again. As a result, FIG.
The contour line shape 34 of the obstacle as shown in (b) is obtained.

After the excavation of 500 mm from the initial position, the excavation machine 1 is stopped from proceeding and the acoustic diagnosis is performed again. As a result, the contour line shape 35 of the obstacle as shown in FIG. 9C is obtained.

Based on the contour line shape 35, the operator gives a crushing instruction using, for example, the injection nozzles 23, 24, 25, and the jetting of this jet water stream crushes some of the obstacles. Cracks may occur on obstacles.

Then, acoustic diagnosis is performed at the point where the excavation is performed 750 mm from the initial position, while the excavation machine 1 is advanced again. As a result, disappearance of the contour line shape of the obstacle as shown in FIG. 9D is confirmed.

Thereafter, at a position 1000 mm from the initial position, acoustic diagnosis by jet injection is performed while the excavation machine 1 is advanced again. As a result, as shown in FIG. 9E, complete disappearance of the contour line shape is confirmed, and it can be determined that the obstacle has been crushed without fail, and then the normal excavation by the excavation machine 1 is continued.

According to the acoustic diagnosis by the jet injection, the crushing sound of the obstacle caused by the jet injection from the jet injection nozzles 23 to 26 is detected at the initial point, and the jet injection nozzles at the point 250 mm from the initial point. The crushing sound of obstacles due to jet injection from 23 to 26 is detected, and the crushing sound of obstacles due to jet injection from each jet injection nozzle 23 to 25 is detected at a point of 500 mm from the initial point, and 750 mm from the initial point. Since the crushing sound from only the jet injection nozzle 23 is detected at the point of, and the crushing sound of the obstacle due to the jet injection from any of the jet injection nozzles 23 to 26 is not detected at the point of 1000 mm from the initial point, The contour line shape 36 of the obstacle toward the traveling direction of the excavation machine 1 is shown in FIG. Will be obtained as shown,
It is possible to excavate a tunnel while accurately determining the size, shape, and position of an obstacle existing in the ground by using an acoustic diagnosis method. Note that φd represents the diameter of the excavating machine 1.

FIG. 10 and FIG. 11 are explanatory views of acoustic diagnosis when the bedrock 6 is present in the forward direction of the excavation (alternate ground). As shown in FIG. 11, the gauge cutter includes the bedrock (including the hard soil layer). (Used as a concept) 6.

First, stop the progress of the excavation machine 1,
While rotating the cutter face plate 20 at a low speed, the jet injection by the jet injection nozzles 23 to 26 is sequentially switched,
The crushing sound due to the jet water jet of each jet nozzle 23 to 26 is detected.

In this case, the crushing sound produced by the jet water jet of the jet jet nozzle 23 does not change. Bedrock 6
This is because the jet stream is not hitting. There is no change in the crushing sound due to the jet water jet of the jet jet nozzle 24. This is because the distance to the bedrock 6 is large as shown in FIG. 11, and even if a crushing sound is generated, the acceleration sensor 29 cannot detect a change in the crushing sound. Similarly, the crushing noise generated by the jet water jet of the jet nozzle 25 does not change. A change in the crushing sound due to the jet water jet of the jet jet nozzle 26 is detected. The rock bed 6 is in contact with the cutter face plate 20,
This is because the acceleration sensor 29 detects the change in the crushing sound.

For example, the change in the crushing sound due to the jet water jet of the jet jet nozzle 26 changes from 130 degrees to 27.
If it is detected over the 0 degree direction, an arc line 37 is obtained as shown in FIG. Based on this result, the operator uses the jet injection nozzles 25 and 26 to issue an instruction to crush the obstacle. As a result, some of the obstacles are crushed.

Next, the excavation machine 1 is moved from the initial point to 2
Acoustic diagnosis is performed again at the point where the sound has advanced 50 mm. As a result, assuming that a change in the crushing sound due to the jet water jet of the jet jet nozzles 25 and 26 is obtained over a range of 130 degrees to 270 degrees, a contour line shape 38 as shown in FIG. 12B is obtained. .

Next, the excavation machine 1 is moved from the initial point to 5
At the point where it is advanced by 00 mm, the progress of the excavation machine 1 is stopped and the acoustic diagnosis is performed again. As a result, a change in the crushing sound caused by the jet water jets of the jet injection nozzles 25 and 26 is obtained over a range of 130 to 270 degrees, and a change in the crushing sound caused by the jet water jets of the jet injection nozzle 24 is 180 degrees. If it is obtained at the rotational position, a contour line shape 39 as shown in FIG. 12C is obtained.

Based on this contour line shape 39, the operator
The rock jet 6 is crushed by jet water jet by appropriately selecting the jet jet nozzle to be used. After that, at the point where the excavating machine 1 is advanced 750 mm from the initial point, acoustic diagnosis is performed again by using the jet injection nozzles 23 to 26 during the excavation, whereby the jet injection nozzle 24
The change in the crushing sound due to the jet water jet injection is obtained at the rotational position of 130 to 240 degrees, and the change in the crushing sound due to the jet water jet injection of jet jet nozzles 25 and 26 is obtained over the range of 130 to 270 degrees. If so, a contour line shape 40 as shown in FIG. 12D is obtained.

Further, the excavation machine 1 is advanced to 100
Acoustic diagnosis is performed over a range from a point of 0 mm to a point of 1500 mm, and a change in crushing sound due to jet water jet injection of the jet injection nozzle 24 is obtained at a rotation position of 130 to 240 degrees, and the jet injection nozzle 2
Changes in the crushing noise caused by jet water jet injection of 5 and 26 are 13
If it is obtained over a range of 0 to 270 degrees, a contour line shape 40 as shown in FIG. 12 (e) is obtained, and in the range from the 1000 mm point to the 1500 mm point, the same soil quality (rock bed 6) is obtained. Can be determined.

After that, at a point of 1750 mm from the initial point, a change in the crushing sound due to the jet water jet of the jet jet nozzle 25 changed by 130 during the bending by the excavating machine 1.
Range of 10 to 200 degrees, the change in the crushing sound due to the jet water jet of the jet jet nozzle 26 is 13
If it is obtained over a range of 0 to 230 degrees, a contour line shape 41 as shown in FIG. 12 (f) is obtained.

Next, assuming that a change in the crushing sound due to the jet water jet of the jet jet nozzle 26 is obtained over a range of 150 to 220 degrees while excavating a point 2000 mm from the initial point, FIG. 12 (g). A contour line shape 42 as shown in FIG.

Further, if it is assumed that a change in the crushing sound due to the jet water jet of the jet jet nozzle 26 is obtained over a range of 160 degrees to 210 degrees during excavation at a point 2250 mm from the initial point, FIG. A contour line shape 43 as shown in FIG.

Further, assuming that no change in the crushing sound due to jet water jet injection of any of the jet injection nozzles 23 to 26 was obtained during excavation at a point 2500 mm from the initial point, as shown in FIG. The contour shape disappears.

As a result, the disappearance of the alternating ground can be confirmed. The shape of the alternating ground in the direction of excavation is
A change in the crushing sound due to only the jet water jet of the jet injection nozzle 26 is detected, and during the excavation of 250 mm from the initial point, a change in the crushing sound due to the jet water jet injection of the jet injection nozzles 25 and 26 is detected. Jet stop nozzle 2
A change in the crushing sound due to only the jet water jets of 4 to 26 is detected, and a change in the crushing noise due to only the jet water jets of the jet injection nozzles 24 to 26 is detected during the excavation of 750 mm from the initial point. 1000 mm
Since the change in the crushing sound due to the jet water jets of the jet jet nozzles 24 to 26 is detected even during the excavation of FIG.
The contour shape 44 shown in FIG. 3 (a) is obtained. In addition, there is no change in the crushing sound over the range of 1000 mm to 1500 mm from the initial point, and during the excavation of 1750 mm from the initial point, a change in the crushing sound due to the jet water jet injection of the jet injection nozzles 25 and 26 is detected. During the excavation of 2000 mm from the initial point, the jet injection nozzle 2
Since the change in the crushing sound due to only the jet water jet injection of No. 6 is detected, the contour shape 45 shown in FIG. 13B is obtained. Further, even during the excavation of 2250 mm from the initial point, only the change in the crushing sound due to only the jet water jet of the jet jet nozzle 26 is detected, and 2500 mm from the initial point
During the excavation of, there is no change in the crushing sound.
The contour shape disappears as shown in (c).

As described above, according to the present invention, the contour shape line in the direction orthogonal to the traveling direction of the excavation target is displayed on the display device 31 based on the detection of the crushing sound at the rotational angle positions of the jet injection nozzles 23 to 26. In accordance with the detection of the crushing sound by the jet injection nozzles 23 to 26 from the radially inner side to the radially outer side while the excavation machine 1 is in progress, the contour line shape of the excavation target in the traveling direction is displayed on the display device 31. Can be drawn.

In the embodiment of the present invention, the jet injection nozzles 23 to 26 are arranged in a row at equal intervals from the inner side in the radial direction to the outer side in the radial direction. However, the present invention is not limited to this. For example, as shown in FIG. 14, the jet injection nozzle 25 is replaced with the jet injection nozzles 23, 24,
The cutter face plate 20 may be provided at a position of 90 degrees in the rotation direction with respect to 26.

[0055]

According to the tunnel excavation method and the tunnel excavation device of the present invention, the tunnel excavation is performed while accurately determining the size and position of the obstacle existing in the ground by using the acoustic diagnosis method. You can

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional tunneling method by acoustic diagnosis.

FIG. 2 is an explanatory diagram of an example of a defect of a conventional tunneling method by acoustic diagnosis, and is a diagram of a defect when a boulder is present in front of the excavation direction.

FIG. 3 is an explanatory view of another example of a defect of the conventional tunneling method by acoustic diagnosis, and is a diagram showing how the excavating machine rides on the bedrock when the bedrock exists ahead of the direction of the digging.

FIG. 4 is an explanatory view of another example of a problem of the tunnel excavation method by the conventional acoustic diagnosis, and is a diagram showing depression of the soft ground when the rock exists in the front of the excavation direction in the soft ground.

FIG. 5 is a front view of the excavating machine according to the present invention, showing an example of a state in which the jet injection nozzle is attached to the cutter face plate from the radially inner side toward the outer side.

FIG. 6 is a diagram showing an example of a nozzle position display screen of the display device according to the present invention.

FIG. 7 is a schematic diagram showing an overall configuration of a tunnel excavation device according to the present invention.

FIG. 8 is a diagram for explaining an example of the acoustic diagnosis method according to the present invention when a boulder is present ahead of the excavation direction.

9A and 9B are explanatory diagrams of the shape determination of the boulders shown in FIGS. 7 and 8, and FIG. 9A is a diagram showing a contour line shape in a direction orthogonal to the traveling direction of the boulders at the initial point, and FIG. Is a diagram showing a contour line shape in a direction orthogonal to the traveling direction of boulders at a point 250 mm from the initial point, and (c) is 5 from the initial point.
It is a figure which shows the outline shape of the direction orthogonal to the advancing direction of the boulder at the point of 00 mm, (d) is 750 from the initial point.
It is a figure which shows the disappearance of the boulder in the point of mm, (e) is a figure which shows the disappearance of the boulder in the point of 1000 mm from an initial point, (f) is a figure of the boulder from the initial point to the point of 1000 mm. It is a figure which shows the contour line shape of the excavation direction.

FIG. 10 is an explanatory diagram for determining the shape of rock mass according to the present invention in the case of alternating soil layers, and is a diagram showing the outer shape of the rock mass when the cutter face plate of the excavation machine is viewed from the rear surface side in the excavation direction.

FIG. 11 is an explanatory diagram for determining the shape of the rock mass according to the present invention in the case of an alternating soil layer, and is a diagram showing the shape of the rock mass in the excavation direction.

FIG. 12 is an explanatory diagram of the shape determination of the rock mass shown in FIGS. 10 and 11, (a) showing a contour line in a direction orthogonal to the traveling direction of the rock mass at the initial point, and (b) showing (b). It is a figure which shows the outline shape of the direction orthogonal to the advancing direction of the bedrock in the point of 250 mm from an initial point, (c) is 50 points from an initial point.
It is a figure which shows the outline shape of the direction orthogonal to the advancing direction of the bedrock in the point of 0 mm, (d) is 750 m from the initial point.
It is a figure which shows the contour shape of the rock mass in the point of m, (e) is a figure which shows the contour shape of the rock mass from the point of 1000 mm to the point of 1500 mm, (f) is 17 from the initial point.
It is a figure which shows the outline shape of the rock mass in the point of 50 mm,
(G) is a diagram showing a contour shape at a point 2000 mm from the initial point, (h) is a diagram showing a contour shape at a point 2250 mm from the initial point, and (i) is a point 2500 mm from the initial point It is a figure which shows the disappearance of the outline shape in FIG.

FIG. 13 is a diagram showing a contour line shape in the excavation direction of rock mass from an initial point to a point up to 2500 mm,
(A) is a figure which shows the contour line shape of the rock excavation direction from the initial point to 1000 mm, (b) is 1000 mm
It is a figure which shows the contour line shape in the excavation direction of the rock mass from the point of 2000 to the point of 2000 mm, and (c) is a figure which shows the contour line shape of the rock excavation direction from the point of 2000 mm to the point of 2500 mm.

FIG. 14 is a front view of the excavating machine according to the present invention, showing another example of a state in which the jet injection nozzle is attached to the cutter face plate from the radially inner side to the outer side.

[Explanation of symbols]

1 ... Drilling machine 20 ... Cutter face plate 23-26 ... Jet injection nozzle 28 ... Partition 29 ... Acceleration sensor (detection sensor) 31 ... Display device (display means)

Continuation of front page (56) Reference JP-A-10-121888 (JP, A) JP-A-7-11867 (JP, A) JP-A-2000-147138 (JP, A) JP-A-6-235290 (JP, A) Patent 2840074 (JP, B2) Patent 3066275 (JP, B2) Japanese Patent Publication 7-13432 (JP, B2) Japanese Patent Publication 6-64155 (JP, B2) (58) Fields investigated (Int.Cl. ⁷⁾ , DB name) E21D 9/06 301 E21D 9/08 E21D 9/10

Claims (9)

(57) [Claims] 1. A jet jet nozzle is provided from a radially inner side of a cutter face plate of a drilling machine toward a radially outer side thereof, and jet water streams are jetted from respective jet jet nozzles toward an excavation target while rotating the cutter face plate. , By detecting the crushing sound of the excavation object based on the injection,
A tunnel excavation method characterized by performing an excavation while determining whether or not an excavation target is an obstacle and also determining its size and position. 2. A smashing noise is detected by jetting a jet water stream from one of the jet jet nozzles while rotating the cutter face plate once while the progress of the excavating machine in the excavating direction is stopped, It is determined whether or not the obstacle is present on the rotation trajectory of the jet injection nozzle, and then while the cutter face plate is rotated once, the jet water flow is ejected from one of the remaining jet injection nozzles. By detecting the crushing sound, it is judged whether or not the obstacle exists on the rotation trajectory of the jet injection nozzle, and the detection of the crushing sound due to the jet water jet of this jet injection nozzle is performed to detect the rotation of each jet injection nozzle. 2. The tunnel excavation method according to claim 1, wherein the method is performed on a trajectory to determine the shape of the obstacle. 3. The shape of the obstacle in the advancing direction is determined by ejecting a jet water flow from each jet injection nozzle while advancing the excavating machine in the excavating direction. Tunnel digging method. 4. The tunnel excavation method according to claim 1, wherein the obstacle is crushed by the jet water flow. 5. A jet injection nozzle which is provided on the cutter face plate of the excavating machine at a predetermined interval from the inner side in the radial direction to the outer side in the radial direction, and jets a jet water stream toward the object to be excavated, and the cutter face plate. A detection sensor that is provided on at least one of the partition wall and the cutter face plate that cooperate with each other to form a closed chamber and that detects a crushing sound based on the jet water jet of the excavation target, and a rotational direction position of the jet jet nozzle. A tunnel excavation device having a display unit for displaying the radial position of the jet injection nozzle. 6. The display means draws a contour line in a direction orthogonal to a traveling direction of the excavation target based on detection of a crushing sound at a rotation angle position of the jet injection nozzle. The described tunneling device. 7. The display means draws a contour line shape in the traveling direction of the excavation target based on the detection of the crushing sound by the jet injection nozzle from the radially inner side to the radially outer side while the excavating machine is in progress. The tunnel excavation device according to claim 5. 8. The display means is provided in a central control unit room, wherein a speaker that reconverts the output of the detection sensor into a sound and emits the sound, and the output of the detection sensor are visualized in the central control unit room. The oscilloscope of claim 1 is provided. 9. The tunnel excavation device according to claim 5, wherein the detection sensor is an acceleration sensor.