JPH05222893A - Adjusting method of bottom of bore hole and device thereof in tunnel boring - Google Patents

Abstract

PURPOSE:To surely and automatically adjust the bottom of a bore hole in a tunnel boring. CONSTITUTION:A lengthwise standard position having a guide shell 3 is set in a virtual facing surface IB position of a section of a tunnel. After that, the guide shell 3 is moved forward to detect a shift distance Lx at a point where the front end of the guide shell is brought into contact with an actual facing IA. The shift distance Lx is subtracted from distance (total boring length) L between the following bottom surface 1C of a bore hole and the standard position before the shifting, and a distance Ld as a result of the subtraction is bored actually by a drifter 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole tail adjusting method and device for ensuring a specified hole length without being affected by the unevenness of the face face in tunnel drilling.

[0002]

2. Description of the Related Art In recent years, with the introduction of the NATM method, the mechanization of tunnel construction, labor saving, economical construction, environmental improvement, etc. have been examined in various fields and the results have been confirmed, and rapid construction of tunnels has begun in earnest. ing. Drilling, charging,
As for blasting technology, drilling technology such as long hole blasting, smooth brushing, and drilling accuracy are required, and development is promoted.
Its effect has also been confirmed. However, on the other hand, it is also true that the inclination of the face face, the occurrence of large irregularities, and the like cause safety problems such as skin loss and a reduction in drilling efficiency.

In drilling a tunnel, it is extremely difficult to drill every predetermined length in the tunnel direction, and even if a hole can be drilled to a predetermined length, due to the uncertainty of blasting, in the usual case, In most cases, the pit tail remains. In addition, it is the current situation that even if an attempt is made to adjust the drilling length, the operator's intuition must be relied upon, and it is practically impossible for a skilled operator to drill holes without leaving a hole tail.

[0004]

Therefore, when the tail of the hole remains, a hole bit is often taken in the tail of the hole, and the hole is often unnecessarily drilled, which leads to extension of the drilling time, and The consumption of drilling bits and rods increases, and drilling efficiency and economic efficiency decrease. Furthermore, the delay of the cycle process has a great influence on the construction process. Further, the use efficiency of the explosive decreases, and the residual explosive may be hit at the time of the next drilling. In addition, if the face is inclined, it will lose its independence and the stability of the ground cannot be ensured.If there are many irregularities on the face, safety problems such as skin loss will occur, and it will be difficult to build support work. There are problems such as.

Therefore, an object of the present invention is to provide a hole tail adjusting method and device for tunnel boring which solves the above problems at once.

[0006]

According to the method of the present invention for solving the above-mentioned problems, a guide shell is attached to a boring bogie arranged in front of a face of a tunnel so as to be movable back and forth, and a drifter is attached to the guide shell. Using a boring machine that can be moved forward and backward, set the reference position in the longitudinal direction of the guide shell to the virtual face position of the tunnel cross section, and then move the guide shell forward so that its tip hits the actual face face. Detecting the feed distance at the time of contact, subtracting the feed distance from the distance between the bottom surface of the next hole to be drilled and the reference position before feed, and drilling the distance resulting from this subtraction with a drifter. It is characterized by. At that time, if the above operation is repeated at each drilling position on the cross section of the tunnel, the tail of the hole can be adjusted in all the cross sections.

On the other hand, the device of the present invention is a boring machine in which a guide shell is attached to a boring bogie arranged in front of a face of a tunnel so as to be movable back and forth, and a drifter is arranged in the guide shell so as to be able to move forward and backward. , A light projector for generating a virtual facet at a certain position of the tunnel, a light receiver for receiving light from the light projector arranged at a reference position in the lengthwise direction of the guide shell, and a tip of the light guide for moving the guide shell forward. A contact detector for detecting the contact with the face, a feed distance detector for the guide shell and the drifter, a signal at the time of receiving light from the light emitter of the light receiver, a guide shell from the contact detector In response to the tip contact signal, the signal from the feed distance detector of the guide shell until the contact by the feed distance detector, and the instruction signal from the target hole edge, It is characterized in that a computing unit for instructing the drilling length against drifter. A laser projector that projects light along the cross section of the tunnel can be used as the projector. If the calculator has a means for correcting the actual drilling length for the drifter based on the angle of the guide shell with respect to the horizontal line, the accuracy of the drilling length is improved.

[0008]

As shown in FIG. 1, the tunnel boring machine is generally provided with a guide shell 3 in front of and behind a boring bogie 2 arranged in front of the actual cutting face 1A of the tunnel left by the previous boring. It has a structure in which it is movably attached, and a drifter 4 is arranged on a guide shell 3 of the guide shell 3 so as to be able to move forward and backward. Using such a boring machine, first, a virtual longitudinal face 1 of a section of the tunnel is formed at a reference position in the longitudinal direction of the guide shell 3, for example, a rear portion.
The position B is set, and then the guide shell 3 is moved forward to detect the feed distance Lx at the time when the tip of the guide shell 3 comes into contact with the actual face 1A. The feed distance Lx is subtracted from the distance L and the distance Ld resulting from the subtraction is drilled by the drifter 4. As a result, it is possible to surely grasp the drilling length, which has conventionally depended on the operator's intuition, and to drill at a predetermined distance from the actual cutting face.

Further, by repeating the above-mentioned operation at each drilling position on the cross section of the tunnel, the tail of the hole can be adjusted in all the cross sections, and all the above problems can be solved.
By using the device of the present invention, the above-mentioned operation or operation can be performed well.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the drawings. First, the hole tail adjusting device of the device of the present invention will be described while explaining the details of the hole drilling machine with reference to FIGS. As shown in FIG. 3, for example, the boring machine allows the boring bogie 10 to have an appropriate number of boring booms 11 and a charging cage boom 12 having an appropriate number of charging cages 12a at its tip. Moreover, it is arranged so as to be rotatable in the left-right direction of the tunnel. A guide shell 30 is arranged at the tip of the boring boom 11 so as to be able to move forward and backward.
In the embodiment, the slide cylinder 13 provided at the tip of the boring boom 11 advances and retracts. This forward / backward travel distance is detected by a guide shell feed distance detector 15 fixed to the rear end of the guide slide 14 of the guide shell 30. The guide shell feed distance detector 15 is
In detail, as shown in FIG. 6, the detection container has a rotating body 17 around which a wire 20 is wound, and a biasing force is constantly applied to the winding side. When the wire 20 is paid out by the movement of the guide shell 30, one end of the wire 20 is attached to the guide shell 30, and the rotary body 17 is rotated by the payout length. The rotary encoder 18 is rotated in accordance with the rotation, and the counter 19 measures the amount of rotation to detect the amount of movement of the guide shell 30. The guide shell feed distance detector 15 is not limited to the above example, but the feed distance detector 15 and the rotary encoder are provided in the guide portion 14a of the guide slide 14 arranged near the tip of the slide cylinder 13, for example. It can also be detected by mounting and contacting the rotating portion with the sliding cylinder 13. In this case, it is possible to replace with the method of detecting the expansion / contraction length of the boom slide cylinder 16.

At the tip of the guide shell 30, a rock landing pad 31 made of an elastic material such as rubber is disposed so as to be contractible by a spring 32. The rocking pad 31 faces the rod supporting the rock landing pad 31 and its housing case 33. A rocking detector 34 (contact detector) including a proximity switch and the like is provided therein so that it can detect that the tip of the guide shell 30 has contacted the actual face.

On the guide shell 30, as is known,
The drifter 4 is arranged so that it can be moved forward and backward by feeding by a chain 40, and a drifter feed length detector 42 is provided on the rear end side of the guide shell 30.
The drifter feed length detector 42 also employs the same detection mechanism as that of the guide shell feed distance detector 15 described above, and the wire fed from the drifter feed length detector 42 is connected to the drifter 4.

On the other hand, as shown in FIGS. 1 and 5, a light receiver 50 is provided at a reference position in the lengthwise direction of the guide shell 30, for example, a rear portion thereof, while a laser beam or the like is provided on the floor surface, for example. A floodlight 51 is provided. A light emitting portion of the light projector 51 rotates around the tunnel direction line, and thus emits a laser beam along the cross section of the tunnel. When the emitted laser light is received, it is determined that the guide shell 30 is set at the reference position. Since the reference position of the guide shell 30 is set for each drilling position, the projector 51 conversely constitutes means for generating the virtual facet 1B.

Using the above-described hole boring machine, hole tail adjustment is performed as described below. More specifically with reference to FIGS. 2 and 7, first, in order to set the guide shell 30 at a certain reference position in the longitudinal direction, the operator operates the drilling machine to extend and retract the drilling boom 11 and retract it. The light receiver 50 of the guide shell 30 at the limit position is adjusted to a position where the laser light emitted from the light projector 51 is received. At the position where the laser beam is received, the operator stops the expansion and contraction of the boring boom 11 to position the guide shell 30. In this case, when the drilling boom 11 is arranged in the vicinity of the projector 51, the guide shell 30 can be positioned only by moving the guide shell 30 forward and backward without expanding and contracting the drilling boom 11. After this positioning is completed, on the operation panel 60 shown in FIG. 7, if the operator manually selects or if the automatic operation is selected, the virtual facet 1 based on the signal from the light receiver 50 is selected.
The B position is stored in a calculator (not shown). further,
The operator sets the specified drilling length L from the tip position of the guide shell 30 to the hole bottom surface 1C to "2500 mm" by using a numeric keypad, for example.

Next, the guide shell 30 is advanced by the sliding cylinder 13, and the time when the rock pad 31 is rocked is detected by the rock detector 34. The feed distance (slide length) Lx until landing on the rock is displayed as "520 mm" on the operation panel 60 shown in FIG. At the same time, the distance to feed the drifter 4 from the landing position to the hole bottom surface 1C is displayed on the operation panel 60 as "1980 mm". Next, when the angle correction key on the operation panel 60 is turned on, the drifter 4 should be fed on the basis of a signal detected by a means (not shown) for the angle of deviation of the guide shell 30 (3) from the horizontal or tunnel center direction. The distance is corrected.

After that, with the auto back key on the operation panel 60 in the ON state, the drifter 4 is moved forward to make a hole. When the total perforation length L is reached, the autoback mechanism is activated, and the drifter 4 automatically retracts to end the perforation.
At this time point, the "drilling end display lamp" is turned on.
This drilling operation is repeated at each drilling position on the cross section of the tunnel, and the hole tail is adjusted on the entire cross section of the tunnel.

In the present invention, the light projector 51 and the light receiver 50 are used in the above-mentioned embodiment as means for generating the virtual facet 1B at a certain position of the tunnel and means for detecting that the virtual facet is located. For example, a combination of a limit switch and a means for activating the limit switch in relation to the guide shell on the floor of the tunnel may be used. As the contact detector for advancing the guide shell and detecting that the tip of the guide shell comes into contact with the actual face, instead of the proximity switch, as in the above-described embodiment, for example, a hydraulic system for moving the guide shell 30 is used. It can also be detected by capturing changes in hydraulic pressure. Guide shell 3
The feed distance detectors 15 and 42 of 0 and the drifter 4 are not limited to rotary encoders.

[0018]

As described above, according to the present invention, the hole tail can be adjusted easily and accurately.
There is no need to take a drill bit at the bottom of the hole or hit the residual explosive at the time of the next drilling. Furthermore, since there is no pit end, the face becomes more independent and
The face face is good and the usage efficiency of gunpowder is improved. Also,
There are advantages such as unnecessary drilling, reduced drilling time, and reduced drill bit and rod consumption.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining the method of the present invention.

FIG. 2 is a construction procedure diagram according to the method of the present invention.

FIG. 3 is a side view of a hole drilling machine equipped with the hole edge adjusting device of the present invention.

FIG. 4 is an enlarged detailed plan view of the boring machine.

FIG. 5 is a side view thereof.

FIG. 6 is a mechanism explanatory view of a feed distance detector.

FIG. 7 is a schematic diagram of an operation panel in front of an operator.

[Explanation of symbols]

1A ... Real face face, 1B ... Virtual face face, 1C ... Hole face face, 2
… Traveling trolley, 3… Guide shell, 4… Drifter, 10
... Trucking vehicle, 11 ... drilling boom, 13 ... slide cylinder, 15 ... feed distance detector, 34 ... rocking detector, 4
2 ... Feed length detector, 50 ... Light receiver, 51 ... Emitter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Ishida 4-12-20 Nihonbashihonmachi, Chuo-ku, Tokyo Sato Industry Co., Ltd. (72) Inventor Junichi Sagawa 4-12-20 Nihonbashihonmachi, Chuo-ku, Tokyo Sato Industry Incorporated (72) Inventor Michio Fujitani 1-1-23 Otemachi, Naka-ku, Hiroshima City Sato Industrial Co., Ltd.China Branch (72) Inventor Toshiaki Yamazaki 1-1-23 Otemachi, Naka-ku, Hiroshima City Sato Industry Co., Ltd. Ceremony Company China Branch (72) Inventor Takehisa Koyama 50 Aioi-cho, Takasaki-shi Gunma (72) Inventor Kazuyuki Ota 14-2 Utagawa-cho, Takasaki-shi Gunma

Claims (5)

[Claims] 1. A guide drill using a drilling machine in which a guide shell is attached to a boring bogie arranged in front of a face of a tunnel so as to be movable back and forth, and a drifter is arranged on the guide shell so that the drifter can move forward and backward. The reference position in the length direction of the shell is set to the virtual cutting face position of the tunnel cross section, and then the guide shell is moved forward to detect the feed distance at the time when the tip of the guide shell comes into contact with the actual cutting face, and the next hole is drilled. A method for adjusting a hole edge in a tunnel hole, wherein the feed distance is subtracted from a distance between a power hole tail surface and a reference position before starting feeding, and the distance resulting from the subtraction is drilled by a drifter. 2. The method according to claim 1, wherein the operation is repeated at each drilling position on the cross section of the tunnel. 3. A drilling machine in which a guide shell is mounted movably forward and backward on a boring truck arranged in front of a face of a tunnel, and a drifter is arranged on the guide shell so that the drifter can move forward and backward. At a position, a light projector for generating a virtual face, a light receiver for receiving light from the light projector arranged at a certain reference position in the longitudinal direction of the guide shell, and a guide shell moved forward so that its tip abuts the actual face. A contact detector for detecting that, a guide shell and drifter feed distance detector, a signal at the time of receiving light from the projector in the light receiver, a guide shell tip contact signal from the contact detector, In response to the signal from the feed distance detector of the guide shell until the contact by the feed distance detector and the instruction signal from the target hole tail, the actual drilling hole length of the drifter is set. A hole tail adjusting device for tunnel drilling, comprising: 4. The apparatus according to claim 3, wherein the projector is a laser projector that projects along the cross section of the tunnel. 5. The apparatus according to claim 3, wherein the arithmetic unit has means for correcting the actual drilled hole length for the drifter by the angle of the guide shell with respect to the horizontal line.