JP2003336488A - Continuous excavation method for pit having bent part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To continuously and efficiently excavate a prescribed depth of a vertical shaft and a prescribed length of an adit from the vertical shaft by a single tunnel excavator. <P>SOLUTION: This tunnel excavator A is disposed with grippers 2A and 2B expanded contracted in four-directional outer circumference of an excavator body 1 by jacks 3A and 3B, and mutually parallel and opposed one pair of grippers 2A and 2A are rotatable about a shaft orthogonally crossing with an axial center of the excavator body 1. While four-directional grippers 2A and 2B are press-fitted to an excavation wall surface t by extension of the jacks 3A and 3B, the excavator body 1 is driven to excavate the vertical shaft B and the adit C. When excavating from the vertical shaft B to the adit C, the direction of the excavator body 1 is changed from the vertical state to the horizontal state using the one pair grippers 2A and 2A as fulcrums and the grippers 2A and 2A are turned and restored into a state fitted to the excavation of the adit C. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of continuously excavating a shaft having a bent portion, such as a method of continuously excavating a shaft from the ground side to a predetermined depth and then continuously excavating a shaft from the bottom of the shaft. The present invention relates to a tunnel excavation device suitable for excavation.

[0002]

2. Description of the Related Art Conventionally, rock tunnel excavators (TB
M) is used to excavate horizontal shafts and oblique shafts. This tunnel excavator cuts down the shaft from the ground side to a predetermined depth and then continuously excavates the horizontal shaft from the bottom of the shaft. However, it is difficult to continuously excavate a tunnel having a bent portion at an arbitrary angle because it is difficult to change the direction of the tunnel excavator to an arbitrary direction at a steep angle.

On the other hand, in the case of a shield excavator used not in a rock tunnel but in a sediment tunnel, a method for continuously excavating a vertical shaft and a horizontal shaft by one excavator is disclosed in, for example, Japanese Patent Laid-Open No. 183895/1993. As described, while supporting the shield machine in a swingable manner in the front end opening of the shaft shield frame provided with the propulsion jack, from the outer peripheral surface of the front end of the skin plate of the shield machine to the shaft shield frame for the shaft. First, using an excavator with a sheath pipe detachably covered on the outer peripheral surface reaching the rear end, first cover the excavation wall surface with the shield pipe directly holding the shield excavator and the vertical shaft shield frame by the sheath pipe. The vertical shaft is excavated by applying a reaction force to the segment and extending the propulsion jack, and after excavating to a predetermined depth, the shield excavator is moved horizontally. Be excavated adit are conducted to pivot.

At this time, in order to turn the shield excavator from the vertical state to the horizontal direction, first, the above-mentioned sheath pipe holding the shield excavator and the vertical shaft shield frame is installed on the ground. By driving multiple winches that were used, it was pulled up to the ground via the wire, and after that,
The shield excavator is oriented horizontally by actuating the swing jack that connects the shaft for the shaft and the rear spherical wall of the shield excavator. Next, after dismantling and removing the above-mentioned rear spherical wall of the turning jack and the shield excavator, the turning center axis, etc., the skin plate was added to form a tubular shape and the equipment necessary for excavating the side shaft was placed inside it. ing.

[0005]

However, according to such an excavating device for a vertical shaft and a horizontal shaft, when the vertical shaft is excavated, the shield machine always presses the cutter head against the face due to its own weight. Moreover, if it is applied to a rock tunnel, it may not be possible to perform efficient excavation according to the rock quality, and excessive pressure may act on the excavation bit of the cutter head, causing damage to the excavation bit in a short time. .

Even if it can be applied to a rock tunnel, when the excavator is turned to a horizontal state after excavating the shaft,
The sheath pipe that holds the shield excavator and the shaft frame for the shaft directly must be removed.Since this sheath pipe slides on the wall surface of the excavation, it drives multiple winches installed on the ground. And trying to pull it up through the wire,
There is a problem in that it cannot be smoothly pulled up by being locked on the excavated wall surface, and that it takes a lot of time and effort to remove it.

Furthermore, even if the turning jack that connects the shaft for vertical shaft and the rear spherical wall of the shield excavator is operated, the shield excavator cannot be turned 90 degrees at a time, so that It is necessary to change the jack for turning books. Also, after turning the shield excavator horizontally, after removing the swivel jack, the above-mentioned rear spherical wall of the shield excavator, the swivel center axis, etc., and dismantling them, the skin plate is added so that it becomes a tubular shape. Since the equipment necessary for excavating the side shaft is installed, except for the cutter head, it is necessary to modify the shield excavator for side shaft excavation, which is almost different from that at the time of excavating the vertical shaft. There was a problem that a long construction period was required for excavation work from the vertical shaft to the horizontal shaft. In addition, when turning at a steep angle again,
It is practically difficult because the sheath tube, the swivel jack, and the spherical wall must be reattached.

From the above, it cannot be used in a rock tunnel. Therefore, when constructing a bent portion in a rock tunnel, the excavator and the succeeding dolly are once taken out of the mine and the rock drilling machine is used. After enlarging and excavating the tip of the tunnel (face) by using, etc., there is no other way but to re-excavate the excavator and the succeeding carriage by changing the direction of the excavator to the desired direction. It was laborious and time consuming and very difficult.

The present invention has been made in view of the above problems, and an object of the present invention is to use a gripper type rock tunnel excavator (TBM) to continuously improve the efficiency of a shaft having a bent portion. (EN) It is an object to provide a continuous excavation method for a well having a bent portion that can be excavated well, and a tunnel excavation apparatus suitable for carrying out this method.

[0010]

In order to achieve the above object, a method of continuously excavating a pit having a bent portion according to the present invention is arranged on four sides of an excavator main body as described in claim 1. While pushing the gripper against the excavation wall surface of the mine, the mine is advanced by propelling the excavator body, and after digging the mine to a predetermined length, among the grippers arranged in four directions,
While one set of grippers facing each other in the diametrical direction of the excavator body is crimped to the excavation wall surface of the mine, the other set of grippers is contracted, and then the one set of grippers crimped to the excavation wall surface is used as a fulcrum. As a result, the excavator body is rotated until it reaches a predetermined angle, and then the other set of contracted grippers is expanded and crimped to the excavation wall surface. The gripper is rotated to the original state, and then the digging body is propelled in a new direction while pressing all the grippers against the digging wall surface to advance the pit.

According to a second aspect of the present invention, there is provided a tunnel excavating apparatus suitable for carrying out a method for continuously excavating a mine having a bent portion, wherein the excavator main body has a cutter head rotatably arranged at a tip thereof. The grippers that expand and contract in the radial direction of the excavator body by jacks are attached to the four sides of the outer circumference, and a pair of grippers facing each other in the diameter direction of the excavator body in these grippers are installed around the axis orthogonal to the axis of the excavator body. It has a structure in which it is rotatably mounted.

In the tunnel excavating device configured as described above, the invention according to claim 3 is such that fixing base plates parallel to the length direction of the excavator body are fixed to four sides of the outer periphery of the excavator body,
A jack support base is mounted on these fixed base plates, and a gripper is mounted on the support base via a plurality of jacks, and a set of grippers facing each other in the diameter direction of the excavator body is supported. The center portion of the support base is rotatably attached to the fixed base plate, and the support base is rotated by the rotation drive mechanism.

Further, in the invention according to claim 4, as a plurality of jacks connecting between the support of each of the jacks and the gripper, a propulsion inclination inclined from the support to the rear side of the excavator body. It is characterized in that it is composed of a jack and an inclined jack for tensioning which is inclined from the support base toward the front side of the excavator main body.

[0014]

The vertical shaft is excavated by pushing the grippers arranged on the four sides of the excavator main body against the excavation wall surface of the shaft, for example, the shaft, to support the excavator main body on the excavation wall surface while propelling the shaft downward. At this time, the excavator main body may be propelled by another jack while adjusting the supporting force of the excavator main body with respect to the excavation wall surface by the plurality of jacks connecting the excavator main body and the gripper. As a jack, a jack for propulsion that is inclined toward the rear side of the excavator body and an inclined jack for tensioning that is inclined toward the front side of the excavator body from the support base The excavator body can be propelled by the propulsion jack while the gripper is pressed against the excavation wall surface by the inclined jack with a predetermined pressing force.

After excavating the vertical shaft to a certain depth in this way, when excavating a horizontal shaft oriented in a predetermined angle, for example, a right angle direction with respect to the vertical shaft, first of all, the grippers arranged in four directions are Among them, a set of grippers facing each other in the diameter direction of the excavator body is crimped to the excavation wall surface of the shaft,
The other pair of grippers is contracted, and then the excavator main body is rotated from the vertical state to the horizontal state with the pair of grippers press-bonded to the excavation wall surface as a fulcrum.
At this time, the cutter head of the excavator body is rotated to change the direction while scraping the bottom wall surface of the shaft.
The rotation of the excavator main body is performed by an appropriate rotation drive mechanism such as a rack and a pinion for the excavator main body with respect to the set of grippers that are pressed against the excavation wall surface.

When the excavator body turns horizontally,
The other set of contracted grippers changes its direction integrally with the excavator body and its convex arc-shaped outer surface can be crimped to the excavated wall surface of the side shaft, but the vertical shaft One pair of grippers, which are crimped to the excavation wall surface, keep the shape suitable for excavating the shaft even if the excavator body turns horizontally After extending one set of grippers and crimping to the excavated wall surface, one set of grippers is contracted and these grippers are rotated 90 degrees by an appropriate rotation drive mechanism to form a convex arc shape. The curved outer surface can be crimped to the excavated wall surface of the shaft. Then, the excavator main body is propelled to advance the side shaft as in the case of the above-mentioned vertical shaft excavation.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a concrete embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a simplified vertical sectional front view of a tunnel excavator A excavating a shaft B, and FIG. FIG. 2 is a lateral cross-sectional view of a portion, in which the excavator main body 1 has a rectangular frame body 1b in which an inner peripheral surface is formed into a circular surface on an outer peripheral surface of an intermediate portion in a length direction of a rectangular tubular body 1a having a constant length. Are integrally fixed to each other, and the four sides of the outer periphery of the rectangular frame 1b, that is, the rectangular frame
The gripper 2 that expands and contracts in the radial direction by a plurality of jacks 3A and 3B is arranged on four flat surfaces parallel to the length direction of the excavator main body 1 in 1b, and a rectangular tubular body is also provided.
A cutter head 4 is rotatably arranged on the tip (lower end) side of 1a.

In the grippers 2 arranged on the four sides of the rectangular frame 1b of the excavator main body 1, one pair of grippers 2A, 2A facing each other in the diametrical direction of the excavator main body 1 are provided.
Is rotatably mounted around an axis orthogonal to the axis of the excavator main body 1, and the other pair of grippers 2B, 2B facing in the diametrical direction of the excavator main body 1 is one of the above-mentioned one pair. Like the grippers 2A and 2A, the grippers 2A and 2A may be mounted so as to be rotatable about an axis orthogonal to the axis of the excavator main body 1, but in the figure, they are respectively attached to parallel surfaces of the rectangular frame 1b. It is mounted so that it cannot rotate.

The mounting structure of these grippers 2A and 2B to the rectangular frame 1b of the excavator main body 1 will be described in more detail. On the above-mentioned flat surfaces on the four outer circumferences of the rectangular frame 1b, as shown in FIG. The plate 5 is fixed, and the support bases 6A and 6A are superposed on one set of the fixed base plates 5 and 5 in the two sets of the fixed base plates 5 and 5 which are parallel to each other, and the central portions thereof are fixed to the fixed base plate 5, 5
On the other hand, it is pivotally mounted on a support shaft 7 projecting from the center of the base, while supporting bases 6B and 6B are fixed on the other set of fixed base plates 5 and 5, and these rotary support bases 6A are fixed. , 6A and fixed support bases 6B, 6B are connected to the base ends of the plurality of jacks 3A, 3B rotatably in the front-rear direction (the length direction of the excavator body 1) and the rod tips are grippered. It is rotatably connected to the inner surfaces of 2A and 2B.

As the rotary drive mechanism 8 for the rotary support bases 6A, 6A, the rectangular frame 1b side and the rotary support base 6A are connected by a jack, and the rotary support base is operated by the operation of the jack.
6A may be configured to be rotated, or alternatively, the excavation wall surface t and the rotation support base 6A may be diagonally connected by a jack and a reaction force may be applied to the excavation wall surface while a jack is operated to rotate the support base. 6A may be configured to rotate, but in the figure, a rotation motor 8a is installed on the rectangular frame 1b, and the pinion 8b fixed to the rotation shaft of this motor 8a.
Is engaged with a circular rack 8c integrally provided with the rotation support member 6A around the support shaft 7, and the rotation support member 6A is rotated around the support shaft 7 by driving the rotation motor 8a. I am configuring. Further, the rotation support base 6A is usually fixed to the fixed base plate 5 by a bolt (not shown) so as not to rotate, and the convex arcuate curved outer surface 2a of the grippers 2A, 2A is arranged in the circumferential direction of the excavation wall surface t. It is held in the state of facing.

Further, the jacks 3A, 3B connecting the grippers 2A, 2B and the support bases 6A, 6B are located behind the excavator body 1 from the support bases 6A, 6B toward the grippers 2A, 2B (in the figure, Is a tilting jack 3A for propulsion.
And a supporting inclined jack 3B that is inclined toward the front (downward in the figure) side of the excavator body 1 from the support bases 6A and 6B toward the grippers 2A and 2B, and from the support bases 6A and 6B to the front side. The gripper 2A, 2B is pressed against the excavation wall surface t by the extension of the supporting inclination jack 3B that is inclined toward the direction to prevent the excavator main body 1 from moving downward more than necessary, and also the support base.
The excavator main body 1 is configured to be advanced by extending the propulsion inclined jack 3A that is inclined from 6A and 6B toward the front side.

The grippers 2A and 2B are constructed so that their outer peripheral surfaces are formed into curved surfaces 2a and 2b which are curved in a convex arc shape in the circumferential direction of the excavation wall surface t so that they are entirely pressed against the excavation wall surface t. At the same time, the grippers 2A, 2A mounted on the rotation support bases 6A, 6A prevent collision with the cutter head 4 when rotating the excavator body 1 from a vertical state to a horizontal state. A part of the side (one side in the figure) on which the excavator main body 1 changes direction is formed as a removable interference part 2 '.

Further, the cutter head 4 is formed in an inverted truncated cone shape that is inclined rearward (upward) from the rotation center portion 41 toward the outer peripheral end, and a large number of roller bits 42 are projected on the excavation surface. In addition, in order to take in the excavation misalignment into the machine, the misalignment intake openings 43 are provided at predetermined intervals in the circumferential direction, and the side edges of the misalignment intake openings 43 facing in the rotational direction are incorporated. The scraper 44 of is attached.

Further, arm members 45 are provided on the outer peripheral end of the cutter head 4 so as to protrude in the inner diameter direction, and ring members 46 are integrally fixed to the inner ends of these arm members 45, and the ring member 46 is excavated. An internal gear 47, which is rotatably supported by the lower end (tip) of the circular inner peripheral surface of the rectangular frame 1b of the main body 1 and is provided on the inner peripheral surface of the ring member 46.
In addition, the external gear 9a fixed to the rotation shaft of the drive motor 9 installed on the rectangular frame 1b is engaged with the motor 9 to drive the cutter head 4 to rotate.

In the tunnel excavator A constructed in this way, a plurality of succeeding stands 10 (three in the figure) having a rectangular plane shape,
11 and 12 are detachably connected in a vertically stacked state, and each succeeding stand 10 to 12 has a cylindrical shape of the same size and shape as the rectangular cylindrical body 1a of the excavator body 1 at the center thereof. Post body 13, 1
4 and 15 are integrally provided, and the opposite end surfaces of the pillars of the vertically adjacent adjoining bases are detachably connected and communicated with each other, and the lower end opening of the pillars 15 of the lower succeeding base 12 is connected to the above-mentioned square tube. The excavator is detachably connected to the upper end opening of the cylindrical body 1a, and further, excavation chips are appropriately conveyed from the inside of the rectangular tubular body 1a of the excavator main body 1 through these pillar bodies 13 to 15 by a bucket conveyor or the like. It is configured to be carried out upward by means.

It should be noted that the succeeding table formed in a plane rectangular shape
10 to 12 are formed such that the length of the diagonal line and the height of each succeeding platform 10 to 12 are shorter than the excavation diameter of the vertical shaft B and the horizontal shaft C described later. Further, the upper succeeding base 10 is provided with, for example, equipment for constructing lining concrete on the excavated wall surface t, the intermediate succeeding stand 11 is provided with various hydraulic equipment, and the lower succeeding stand 12 is provided with a lock. A bolt driving device 16 and a lining concrete spraying device (not shown) are provided to perform work such as primary lining on the excavated wall surface t.

Next, with the tunnel excavator A constructed as described above, first, in order to excavate the vertical shaft B vertically down to a predetermined depth, in order to excavate vertically, the grippers 2A arranged on all sides of the excavator body 1 are used. , 2B are crimped to the excavation wall surface t by the inclined jacks 3A, 3B, the propulsion reaction force is applied to the excavation wall surface t, and the tunnel excavator A and the subsequent bases 10 to 12 are supported. While the tunnel excavator A is propelled vertically downward by extending the propulsion inclined jack 3A which is inclined upward, the rock face is excavated by the rotation of the cutter head 4. A rectangular frame
Inclined jack for strut inclined obliquely downward from 1b
3B is to prevent the tunnel excavator A from dropping more than necessary by adjusting the pressing force of the lower ends of the grippers 2A and 2B against the excavation wall surface t.

In this way, the tunnel excavator A is mounted on the succeeding stage thereof.
When the shaft B is excavated downward together with 10 to 12 to a predetermined depth, first, in a position before reaching the predetermined depth, as shown in FIG. After the upper trailing platform 10 is suspended from the excavation wall surface t or the crane on the ground by the wire rope 17, the trailing platforms 10 to 12 are separated from the tunnel excavating machine A by advancing the tunnel excavating machine A to a predetermined depth. After that, the tunnel excavator A is tilted with its inclined jack 3B.
To be slightly retracted and separated from the face. In addition, the support of the succeeding bases 10 to 12 is not limited to the above-described configuration, and for example, the rear mounts may be supported by attaching jacks to several positions on the side of the succeeding base, extending the jacks, and pressing the jacks against the excavation wall surface t. . Further, only the cutter head 4 may be retracted without retracting the tunnel excavator A, and further, the cutter excavator A may not be retracted at all.

In this state, one pair of grippers 2A,
The rotation support base 6A on which the 2A is mounted can be rotated with respect to the fixed base plate 5 by removing the fixing bolt, and as shown in FIG. 4, these grippers 2A, an interference portion on one side of 2A. 2 '
Is once removed, and then the grippers 2A, 2A are pressed against the excavation wall surface t, while the other pair of grippers 2A
The diameters of B and 2B are maximally reduced by contracting the jacks 3A and 3B supporting them. In addition, if necessary, the roller bit 4 can
Wear 2 '.

After that, when the cutter head 4 is rotated and the motor 8a of the rotary drive mechanism 8 is driven, the pinion 8b fixed to the rotation shaft of the motor 8a causes the excavation wall surface t.
One set of the grippers 2A that are crimped to the above, fixed support where the motor 8a is installed by moving in the circumferential direction while engaging with the circular rack 8c provided on the outer peripheral end surface of the rotation support base 6A of the 2A. As shown in FIGS. 5 and 6, the tables 6B and 6B are the gripper 2
Around the spindle 7 with A and 2A as fulcrums
While gradually turning from the vertical state to one side, the cutter head 4 cuts off one side wall surface of the excavation wall surface t of the vertical shaft B.

In this way, when the excavator main body 1 turns 90 degrees around the support shaft 7 and changes its direction in the horizontal direction, as shown in FIGS. 7 and 8, the other set of grippers contracted. 2B, 2B
Is in a state in which the outer surface 2b curved in a convex arc shape by changing its direction integrally with the excavator main body 1 is directed in the circumferential direction of the excavation wall surface t'of the horizontal shaft C to be subsequently excavated, but the bottom portion of the shaft B Pair of grippers 2A, 2A that are crimped to the excavated wall surface t in
Holds a state suitable for excavating the shaft B even if the excavator main body 1 changes its direction in the horizontal direction.

In order to bring this pair of grippers 2A, 2A into a state suitable for excavating a horizontal shaft C, first, as shown in FIG. After forming a bottom surface portion D connected to the bottom surface of the horizontal shaft C to be excavated next, the other pair of contracting grippers 2B, 2B is extended to face the bottom surface portion D to the lower gripper. The excavator main body 1 is supported by abutting the bottom surface portion 2B on the bottom surface portion D, and after this state is set, the pair of grippers 2A, 2A that is crimped to the excavation wall surface t is contracted.

Then, the motor of the rotary drive mechanism 8 is
When 8a is driven, the rotation supports 6A and 6A rotate on the fixed plates 5 and 5, and when the rotation angle reaches 90 degrees, the direction of these grippers 2A and 2A excavates the horizontal shaft C. Suitable condition for
That is, the outer surfaces 2a, 2a curved in the shape of a convex arc are in a state of being directed in the circumferential direction of the excavation wall surface t'of the horizontal shaft C.

Next, the interference parts 2 ', 2'which were removed when the excavator body 1 was rotated are attached to these grippers 2A, 2A to restore the original shape, and then the grippers 2A, 2A are fixed by fixing bolts. 2A rotary support base 6A, 6A fixed base plate 5,
Fix at 5. After that, as shown in FIG. 10, a pad E is interposed between the grippers 2A, 2A and the excavation wall surface t at the bottom of the shaft B so that the grippers 2A, 2A are evenly arranged on the excavation wall surface t through the pad E. By pressing, in this state, by operating the tilting jack 3A for propulsion and the tilting jack 3B for bracing while rotating the cutter head 4,
The tunnel excavator A is excavated in the horizontal direction to excavate the side pit C.

When this side shaft C is excavated for about 20 to 30 m, rails are provided on the inner bottom surface of the side shaft C as shown in FIGS. 11 and 12.
18 is laid, and after excavation of the vertical shaft B, it is separated from the excavator body 1 and the succeeding bases 10 to 12 suspended from the excavation wall surface t in the upper part of the bottom are separated one by one and run on this rail 18. The excavators are arranged one after another freely and are connected to the excavator body 1 in series. At this time, the wheels 19 of each succeeding stand 10 to 12 have been previously carried in from the ground to the succeeding stand 10 to 12 when excavating the shaft B, and when the rail 18 is laid and then hung on the rail 18. Mounted on the bottom of the succeeding stand 10-12 to form a dolly.

Thus, the trailing truck 10 is mounted on the tunnel excavator A.
-12 are sequentially connected and the tunnel excavator A is excavated while using various equipment such as hydraulic equipment and lining equipment arranged on these succeeding carriages 10-12, and a horizontal shaft of a predetermined length It excavates C. In addition, in the above embodiment, the continuous excavation method of the bent portion from the vertical shaft B to the horizontal shaft C has been described, but it is not limited to the vertical shaft B and the horizontal shaft C, and the tunnel being excavated by the tunnel excavator A (the tunnel From the above), it is naturally possible to carry out the continuous excavation of the pit in any direction at a steep angle with respect to the pit.

[0037]

As described above, according to the method for continuously excavating a mine having a bent portion according to the present invention, as described in claim 1,
First of all, since the excavator body is advanced by pushing the grippers arranged on all four sides of the excavator body against the excavation wall of the excavator, the cutter head is overloaded by the weight of the excavator body. Excavation according to the situation of the face ground can be performed without applying any force, and excavation of shafts such as vertical shafts can be performed efficiently.

Further, after excavating the mine to a predetermined length,
Among the above-mentioned grippers arranged in four directions, one set of grippers facing in the diametrical direction of the excavator main body is crimped to the excavation wall surface of the mine, while the other set of grippers is contracted, and then the excavation wall surface. Since the excavator main body is rotated by a predetermined angle with the pair of grippers crimped to the fulcrum as a fulcrum, the entire excavator main body is easily and surely turned in the predetermined direction even at a steep angle. Therefore, preparation for excavation of the pit is smoothly performed, and continuous digging of a pit having a bent portion is possible.

In addition, after the excavator body turns in a predetermined direction at a steep angle, the other set of grippers that has been contracted is extended and crimped to the excavation wall surface, while the other set of grippers is pressed. Since the grippers are contracted and these grippers are rotated back to the original state, after that, all the grippers are pressed against the excavation wall surface and the excavation body is propelled in a predetermined direction to excavate the pit. This tunnel excavator makes it possible to smoothly excavate a continuous mine through a bent portion to a predetermined length with the grippers arranged on all four sides of the machine body being in a state suitable for excavating the mine.

A tunnel excavator for continuously excavating a mine having this bent portion has a cutter head rotatably provided at the tip of the tunnel excavator, as described in claim 2, on all four sides of the outer periphery of the excavator body. A gripper that expands and contracts in the radial direction of the excavator body by a jack is mounted, and a pair of grippers facing each other in the diameter direction of the excavator body in these grippers can be rotated around an axis orthogonal to the axis of the excavator body. Since it is attached to the excavator wall, the four grippers are pressed against the wall surface of the excavator and the excavator body is supported while the excavation of shafts such as vertical shafts and side shafts can be performed accurately and efficiently. Since it is rotatable about an axis orthogonal to the axis, it is easy to change the orientation of the excavator body in a predetermined direction at a desired angle, for example, to change the orientation of the excavator body from a vertical shaft to a horizontal shaft. and It is possible to perform the sure the gripper can also easily revert back to the posture can be fully adhered to the excavation wall of pit drilling in different directions.

In the tunnel excavator according to claim 2, in the invention according to claim 3, fixing base plates parallel to the length direction of the excavator main body are fixed to four sides of the outer periphery of the excavator main body, and these are fixed. The jack support is mounted on the base plate, the grippers are mounted on the support via a plurality of jacks, and the set of grippers facing in the diametrical direction of the excavator body is supported. Since the central part of the support base is rotatably pivoted to the fixed base plate and the support base is rotated by the rotation drive mechanism, a pair of grippers are supported by these grippers. The excavator body can be easily rotated together with the jack on the fixed base plate, and the rotary drive mechanism is operated in a state where these grippers are pressed against the excavation wall surface, so that the excavator main body is paired with the other set of grippers. With one It is possible to change the orientation.

According to the fourth aspect of the invention, the plurality of jacks connecting the support base and the gripper are inclined jacks for propulsion which are inclined from the support base toward the rear side of the excavator body. And the inclined jack for strut which is inclined from the support to the front side of the excavator body, the gripper can be pressed against the excavated wall by the inclined slant jack without using a separate propulsion jack. It is possible to excavate a vertical shaft, a horizontal shaft, etc. while propelling the excavator main body by a propelling inclined jack while being pressed by pressure.

[Brief description of drawings]

FIG. 1 is a simplified vertical sectional front view of a tunnel excavator that excavates a vertical shaft to a predetermined depth.

FIG. 2 is a simplified cross-sectional view of grippers arranged on all four sides,

FIG. 3 is a simplified vertical cross-sectional front view showing a state in which a succeeding stand is separated from the excavator body,

FIG. 4 is a simplified cross-sectional view of the other pair of grippers in a contracted state,

FIG. 5 is a simplified vertical sectional front view showing a state in which the excavator body is turned horizontally.

FIG. 6 is a simplified cross-sectional view of the gripper portion,

FIG. 7 is a simplified vertical sectional front view showing a state in which the excavator body is turned horizontally.

FIG. 8 is a simplified cross-sectional view thereof,

FIG. 9 is a simplified vertical sectional front view showing the other pair of grippers in an extended state,

FIG. 10 is a simplified cross-sectional view of one set of gripper portions,

FIG. 11 is a simplified vertical sectional front view showing a state where a horizontal shaft is being excavated,

FIG. 12 is a simplified cross-sectional view thereof.

[Explanation of symbols]

A tunnel excavator B shaft C side pit t Excavation wall surface 1 excavator body 2A, 2B gripper 3A, 3B tilt jack 4 cutter head 5 Fixed base plate 6 support 8 Rotational drive mechanism

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tetsuya Yokoyama             2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi             Inside the Okumura group F term (reference) 2D054 AA07 AC20 AD02 AD16 BA03                       BB06

Claims (4)

[Claims] 1. An excavator body is driven by propelling the excavator body while pressing the grippers arranged on all four sides of the excavator body against the excavation wall surface of the excavator body. Among the above-mentioned grippers installed, one set of grippers facing in the diametrical direction of the excavator body is crimped to the excavation wall surface of the mine, while the other set of grippers is contracted, and then crimped to the excavation wall surface. The excavator body is rotated about the set of grippers as a fulcrum until it reaches a predetermined angle, and then the other set of contracted grippers is extended and crimped to the excavation wall surface. Contracting a set of grippers and rotating these grippers to their original state, and then pushing all the grippers against the excavation wall while propelling the excavation body in a new direction to advance the mine. A method for continuously excavating a mine having a bent portion. 2. An excavator main body in which a cutter head is rotatably arranged at the tip is equipped with a gripper that expands and contracts in the radial direction of the excavator main body by jacks on four sides of the outer periphery of the excavator main body. A tunnel excavating device, wherein a pair of diametrically opposed grippers are mounted rotatably around an axis orthogonal to an axis of an excavator body. 3. An excavator main body is secured to fixed base plates parallel to the longitudinal direction of the excavator main body on four sides, and a jack support base is mounted on these fixed base plates, and a plurality of support bases are mounted on the support base. The gripper is attached via the jack of, and the central portion of the support table supporting a set of grippers facing in the diametrical direction of the excavator body is pivotally attached to the fixed base plate, The tunnel excavating device according to claim 2, wherein the support base is further configured to be rotated by a rotation drive mechanism. 4. The plurality of jacks connecting the support base and the gripper include a propulsion inclined jack inclined from the support base toward the rear side of the excavator body, and a front side of the excavator body from the support base. The tunnel excavating device according to claim 2 or 3, wherein the tunnel excavating device comprises an inclined jack for strut which is inclined toward.