JPH063337A - Forward ground exploration device for tunnel face - Google Patents

Abstract

(57) [Abstract] [Purpose] It is easy to install the exciter and the detector even on the uneven face of the tunnel, and at the same time, it is possible to automate this installation, and firmly fix it firmly to the face of the tunnel. (EN) Provided is a forward ground exploration device for a tunnel face, which can prevent a decrease in Rayleigh wave propagation efficiency. [Structure] Exciter 1 that is fixed to the tunnel face and vibrates.
1, detectors 17A and 17B that are fixed to the tunnel face and detect Rayleigh waves, and an analyzer 22 that analyzes the propagation waveform of the Rayleigh waves, and the exciter and the detector are
A front ground exploration device for a tunnel face, which has a pressure contact member (12) at a ground contacting portion with the tunnel face and has a pressing means (16) for pressing and fixing the pressure contact member to the tunnel face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front ground exploration device for a tunnel face, and more particularly to a tunnel boring machine (TB) which can be easily attached to the face.
The present invention relates to a front ground exploration device for a tunnel face that can be installed in M) or the like.

[0002]

2. Description of the Related Art Conventionally, when excavating a tunnel, the geological features such as fault crush zones and geological boundaries have been investigated in advance by surface exploration on the planned tunnel line, boring from the surface, and elastic wave exploration. . In addition, recently, as a method of exploring the geology of a tunnel excavation line with higher accuracy, an exploration method of exciting a tunnel face and analyzing a propagation waveform of a generated Rayleigh wave has been proposed. In the exploration method using the Rayleigh wave, in order to reliably transmit the Rayleigh wave vibration, an exciter that generates the Rayleigh wave and a detector that detects the Rayleigh wave are firmly fixed to the tunnel facet. There is a need.

[0003]

However, since the tunnel face is usually uneven, a method for firmly fixing the exciter and the detector to the tunnel face is to use the exciter and the detector themselves. A method of fixing with cement or the like, or a bolt insertion hole is previously provided in the tunnel face by a drill or the like, and an anchor bolt for connecting to the vibration generator or the detector is inserted into the bolt insertion hole, and then an adhesive and / or Only the method of fixing with quick-setting cement etc. is adopted. In such a method of fixing the exciter and the detector, it is necessary for the worker to directly perform the manual work directly on the face of the face, which is dangerous and requires a long time for installation, and the face of the large diameter face is also involved. However, there is a drawback in that it is extremely difficult to install the vibrator and the detector on the upper face of the face. Further, in the above method, a work space for installing the vibrator and the detector is required. Therefore, in tunnel excavation by the TBM method or the like, the TBM must be retracted at the time of installation, which causes a problem that the work becomes complicated.
Furthermore, in the method of inserting the anchor bolt, it is difficult to sufficiently fill the insertion hole with the adhesive or the quick-setting cement, so that there is a problem that the vibration propagation efficiency of the Rayleigh wave is reduced.

Therefore, the present invention has been made to solve the above-mentioned problems, and it is easy to install a vibrator and a detector even on an uneven tunnel face, and it is possible to automate the TBM. It is an object of the present invention to provide a forward ground exploration device for a tunnel face which can be installed in a tunnel.

Further, in the present invention, the exciter and the detector can be firmly fixed even on the uneven tunnel face, and the front ground of the tunnel face that can prevent the Rayleigh wave propagation efficiency from being lowered. It is an object to provide an exploration device.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned object, and it excites a tunnel facet to generate a Rayleigh wave, and detects and analyzes the Rayleigh wave propagating through the facet. And a device for exploring the situation of the front ground, which is fixed to the tunnel face and vibrates, and a detector fixed to the tunnel face to detect Rayleigh waves,
An analyzer for analyzing a propagation waveform of the Rayleigh wave, wherein the exciter and the detector have a pressure contact body at a grounding portion in contact with the tunnel face, and the pressure contact body is pressed and fixed to the face face of the tunnel. Provided is a forward ground exploration device for a tunnel face, comprising a pressing means.

In the present invention, the Rayleigh wave is a surface wave that oscillates elliptically on the free surface and propagates in the radial direction from the exciter. This Rayleigh wave propagates from the surface to a given depth with almost uniform intensity, which depth depends on the frequency process. That is, when the frequency is high, the depth is shallow, and when the frequency is low, the depth is deep. Therefore, by changing the frequency, it is possible to search the ground for each depth from the face face. Then, to analyze the condition of the ground, the propagation velocity of Rayleigh waves is calculated. For example, by dividing the distance between the detectors installed at two locations by the time difference until the Rayleigh wave reaches each detector, the propagation velocity of the Rayleigh wave for each frequency, that is, the ground for each depth is calculated. Then, the ground condition is analyzed from these characteristics.

The pressure contact member is not particularly limited as long as it can be firmly and surely fixed by pressing means even on an uneven tunnel face, and can prevent the Rayleigh wave propagation efficiency from decreasing. It's not something
For example, a deformable bag containing a fluid solid matter or a projecting body in which the shape of the portion in contact with the face of the face is spherical can be mentioned. Further, when the deformable bag is a bag having a particularly high airtightness, a vacuum pump or the like may be connected to the bag when fixing it to the face of the face to remove gas inside the bag to further strengthen the fixing. it can.

[0009]

In the forward ground exploration device for a tunnel face of the present invention, the pressing means acts so as to mechanically fix the exciter and the detector to the face, and the tunnel face of the exciter and the detector. The press-contact body provided in the ground contacting portion firmly fixes the exciter and the detector firmly and reliably even on the uneven tunnel face.

[0010]

Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings, but the present invention is not limited thereto.

In FIG. 1, a front ground exploration device 10 is installed on a tunnel facet 30 excavated by a tunnel excavator,
The configuration for detecting the propagation velocity of Rayleigh wave and exploring the ground ahead is shown. The front ground exploration device 10 includes a vibrator 11 installed above the face face 30 and two detectors 17A and 17B arranged in a line at a predetermined distance in the radial direction from the vibrator 11. And an analyzer 22 that includes a control mechanism that controls the frequency of vibration by the exciter 11 and that processes the signals from the detectors 17A and 17B to determine the geological condition.

The exciter 11 is of an electromagnetic type in which a center weight vibrates left and right by the action of a coil spring, and a bottom plate 11a for transmitting the vibration to the face face 30 is provided on the face face side, and a rear face side of the face face is provided. A hydraulic jack 16 for pressing the exciter 11 against the facet 30 is provided via an air damper 15 having a vibration isolation function. Also bottom plate 1
A deformable bag 12 formed of a reinforced polymer film for firmly fixing the vibrator 11 to the facet 30 and improving the efficiency of vibration transmission from the vibrator 11 is installed in front of 1a. . Corresponding to the uneven surface of the face face 30, fluid ceramic powder 13 is contained in the bag 12 so that the bag 12 is deformed due to the close contact with the inner surface of the bag 12.
It is filled with about vol%. Further, a vacuum pump 14 is connected to the bag 12 to remove air from the inside and improve the adhesion to the face face 30.

The exciter 11 causes the face 3 to face by the pressing force of the hydraulic jack 16 via the air damper 15.
The bag 12 that is pressed against 0 and is in contact with the face face 30 by this pressing force is deformed according to the unevenness of the face face, the ceramic powder 13 inside loses fluidity, and the vibrator 11 itself causes the face face 30 to move. Firmly adhere and fix to. At this time, hydraulic jack 1
6 and the vacuum pump 14 are operated to remove the air in the bag 12.
The fixing property of is further improved.

The material forming the bag 12 may be an airtight material or a material through which gas passes, but it is required to have a strength that is not destroyed by the pressing force of the hydraulic jack 16. However, for example, reinforced rubber can be used, and the bag 12 can be further covered with a polymer reinforced film. The material of the ceramic powder 13 is not particularly limited as long as it is a solid material that has fluidity and is fixed according to the unevenness of the face face by the pressing force.

The vibrator 11 fixed in close contact vibrates at a predetermined frequency according to a command from an analyzer 22 having a control device programmed in advance according to the type of ground, and makes the face face 30 a predetermined depth. The moving Rayleigh wave 32 is generated.

A detector 17 for detecting the propagation velocity of the Rayleigh wave 32 generated on the facet 30 by the vibration of the exciter 11.
Vacuum pumps 19A and 19B similar to the bag 12 provided on the face 30 side of the vibration exciter 11 are connected to A and 17B,
The bags 18A and 18B filled with the ceramic powder are installed. On the other hand, on the rear side of the detectors 17A and 17B, hydraulic jacks 21A and 21B for pressing the detectors against the face of the face and fixing them tightly are installed via dampers 20A and 20B.

These detectors 17A, 17B can be firmly fixed in close contact with each other in correspondence with the unevenness of the face face 30 like the exciter 11.

When the set of detectors 17A and 17B is installed in line with the exciter 11, propagation between the detector 17A closer to the exciter 11 and the detector 17B farther from the exciter 11. The time difference of the waves is measured and the data is analyzed by the analyzer 22.
The propagation velocity of the Rayleigh wave 32 is calculated by sending the data to the detector, and these detectors are moved in an arbitrary radial direction as appropriate, and the measurement is repeated to quantitatively determine the fault fracture zone 31 and the travel and inclination of the fault. It can be measured. At this time, at least two detectors should be provided.

FIG. 2 shows another embodiment of the vibrator 11 shown in FIG. 1, in which the vibrator 41 is a bottom plate 4
1a, the hydraulic jack 46, and the air damper 45 are provided similarly to the exciter 11 of FIG. In front of the bottom plate 41a, the vibrator 41 is firmly fixed to the face surface 30a,
A pressure contact 42 made of steel is provided so as to project to improve the efficiency of vibration transmission from the vibration generator 41. By making the tip of this pressure contactor 42, that is, the shape of the portion that is pressed against the face face 30a spherical, the vibrating machine 41 can be made firm only by the pressing force of the hydraulic jack 46 against any irregularities on the face face 30a. Can be closely fixed to.

Further, in the detectors 17A and 17B shown in FIG. 1, a bag 18 to which vacuum pumps 19A and 19B are connected.
Instead of A and 18B, such a pressure contactor 42 may be provided.

FIG. 3 shows a tunnel boring machine 50.
FIG. 1 shows a configuration in which the front ground exploration device for a tunnel face of the present invention is mounted. That is, the vibration generator 51 including the pressure contactor 52 and the hydraulic jack 56 similar to those in FIG. 2 and the two detectors 57 including the pressure contactor 58 and the hydraulic jack 61.
Is housed in a vibrator storage box 70 and a detector storage box 71 provided on the cutter surface at the tip of the tunnel boring machine 50 so that the work is not supported when the ground is cut by the cutter, and the cutter is used when exploring the ground. The cutting of the ground by (1) is interrupted, and the exciter 51 and the detector 57 are pushed out by the hydraulic jacks 56, 61 to be closely fixed to the face of the face, thereby exploring the ground.
The vibration of the exciter 51 is sent via the vibration control cable 72 to the vibration control device 7 provided in the TBM operator cab 73.
4 and the control analysis device 76 provided in the ground control room 75, and the detection result of the detector 57 is sent to the signal processing device 78 of the TBM operator room 73 and the control analysis device 76 via the data transmission cable 77. It is sent and these data are analyzed. According to such an exploration device, even if the face is not open, the exploration of the ground can be performed automatically and safely without intruding a worker, and the total operation together with the operation control of the tunnel boring machine 50 can be performed. By controlling and managing in this way, the safety, automation and construction rationalization of mountain tunnel construction can be achieved.

[0022]

In the forward ground exploration device for a tunnel face according to the present invention, the exciter and the detector installed on the face have a pressing means and a pressure contact body which is pressed and fixed by the pressing force of the pressing means. Also, it can be firmly fixed even on an uneven tunnel face, and is excellent in the propagation efficiency of Rayleigh waves. Further, since the vibration generator and the detector can be installed on the face of the face by the pressing means, automation is possible, and T
By installing it on the BM or the like, it is possible to continuously perform excavation and exploration, and further, the exploration of the ground can be performed without the operator directly performing manual work on the face face.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of a front ground exploration device for a tunnel face installed on the face of the present invention.

FIG. 2 is a schematic diagram showing another example of the exciter in the front ground exploration device for the tunnel face shown in FIG.

FIG. 3 is an explanatory diagram showing a configuration in the case where the forward ground exploration device for a tunnel face of the present invention is mounted on a tunnel boring machine.

[Explanation of symbols]

 10 Tunnel front face exploration device 11 Exciter 17A, 17B Detector 22 Analyzer

Front page continuation (72) Inventor Masahiro Kurodai 2-5-8 Kita-Aoyama, Minato-ku, Tokyo In-house Ltd. (72) Inventor Tatsuji Osamu 2-5-8 Kita-Aoyama, Minato-ku, Tokyo In-house Ltd.

Claims (1)

[Claims] 1. A device for exciting a tunnel face to generate a Rayleigh wave, detecting and analyzing the Rayleigh wave propagating through the face, and investigating the condition of the front ground, which is fixed to the tunnel face. Then, an exciter that vibrates, a detector that is fixed to the tunnel facet to detect a Rayleigh wave, and an analyzer that analyzes the propagation waveform of the Rayleigh wave, the exciter and the detector, A front ground exploration device for a tunnel face, comprising a pressure contact member at a ground contacting portion with the tunnel face, and a pressing means for pressing and fixing the pressure member to the tunnel face.