JP2003129796A - Propulsion apparatus of open-type tunnel boring machine and its propulsion method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a propulsion apparatus of an open-type tunnel boring machine and its propulsion method capable of boring the ground only by a gripper in the rear of a main body frame and omitting a front gripper. SOLUTION: In the propulsion apparatus of the open-type tunnel boring machine, an excavator 3 for excavating a cutting face 1 is provided in the main body frame 2 open to the side of the cutting face 1. A gripper 25 for pressing and releasing the inner surfaces of a bored hole 24 is arranged in the bored hole 24 in the rear of the main body frame 2. A propulsion jack 26 for moving the main body frame 2 forward by the reaction force of the pressing gripper 25 and retrieving the released gripper 25 is interposed between the gripper 25 and the main body frame 2. The side area of the main body frame 2 and the sum weight of the main body frame 2 and the excavator 3 are set in such a way that the friction holding force between the main body frame 2 and the side ground 53 is greater than the frictional resistance force between the gripper 25 when retrieved and the inner surfaces of the bored hole 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion device for an open tunnel excavator in which an excavator for excavating a face is provided in a main body frame whose face is open, and a propulsion method therefor.

[0002]

2. Description of the Related Art As a tunnel excavator, a cutter, which is rotationally driven to excavate a face, is provided at a front portion of a body frame,
A front gripper that presses and releases the side ground is provided on the side of the body frame, and a rear gripper that presses and releases the inner surface of the hole is placed in the rear hole of the body frame, and between the rear gripper and the body frame. A propulsion jack is known (Japanese Patent Laid-Open No. 62-273394).

In this type of tunnel excavator, the propulsion jack is extended while the rear gripper is pressed against the inner surface of the hole, so that the rear gripper takes a reaction force to move the main body frame forward, and the cutter is rotated during this time. Drill a face. After that, the front gripper is pressed against the side ground and the rear gripper is released from the inner surface of the hole, and the propulsion jack is contracted in this state, whereby the rear gripper is pulled toward the main body frame side.

As described above, the front gripper and the rear gripper are alternately operated, and the propelling jack is expanded and contracted in synchronization with the operation, whereby the forward movement of the main body frame and the pulling of the rear gripper are alternately performed, and the ground is struck by the shrew. To dig in.

[0005]

By the way, since the above-mentioned tunnel excavator is of a type in which the earth pressure of the cutting face is applied to the main body frame through the cutter (a closed tunnel excavator in which the cutting face side of the main body frame is sealed), Not only the rear gripper but also the front gripper is required for propulsion.

That is, in the closed tunnel excavator, the earth pressure of the cutting face always works in the direction of retracting the main body frame through the cutter. Therefore, if there is no front gripper, the rear gripper presses the inner surface of the hole. When released, the body frame may retract due to face earth pressure.

For this reason, the front gripper is indispensable, leading to an increase in the cost of the apparatus, and an operation for interlocking the pressing / releasing of the front gripper with the extension / contraction of the propulsion jack is required, which complicates the propulsion operation. Was there.

The object of the present invention, which was devised in view of the above circumstances, is to provide a propulsion device and a propulsion method for an open tunnel excavator which can omit the front gripper, reduce the cost, and simplify the excavation operation. To provide.

[0009]

In order to achieve the above object, the first invention is a propulsion device for an open tunnel excavator in which a body frame whose side face is open is provided with an excavator for excavating the face face. Then, a gripper that presses and releases the inner surface of the hole is arranged in the rear hole of the main body frame, and a reaction force is applied to the pressed gripper between the gripper and the main body frame to form the main body frame. A propulsion jack that pulls in the gripper that has been moved forward and released is provided, and the friction holding force between the body frame and the side ground is greater than the frictional resistance between the gripper and the inner surface of the hole when pulling the gripper. The side area of the main body frame and the total weight of the main body frame and the excavator are set.

According to the present invention, since the face side of the main body frame is an open tunnel excavator in which the face side is open, face earth pressure is not applied to the front face of the main body frame, and when the gripper is separated from the inner surface of the hole. , The body frame will not be pushed back by the earth pressure of the face. Therefore, it is not necessary to equip the main body frame with the front gripper (for countering the face earth pressure) for preventing the retreat based on the face earth pressure.

However, even if the front gripper against the earth pressure against the face is not required, the gripper is pulled toward the main body frame when the propulsion jack that has been extended is contracted in order to pull the gripper toward the main body frame. Instead of, it is possible that the main body frame will be attracted to the gripper side, so on the main body frame,
It is considered necessary to have a front gripper (for holding the pulling force) to support the pulling force of the gripper on the side ground.

In this respect, according to the present invention, the side area of the main body frame and the main body frame are adjusted so that the friction holding force between the main body frame and the side ground is larger than the frictional resistance force between the gripper and the inner surface of the hole during pulling. Since the total weight of the frame and the excavator is set, the gripper can be reliably pulled to the main body frame side when the propulsion jack is contracted, even if the main body frame is not equipped with the front gripper for holding the pulling force.

Further, the excavator may have an anchor function of penetratingly engaging with a face when pulling the gripper and taking part of the pulling force. In this way, the burden of the pulling force due to the friction holding force between the main body frame and the side ground is lightened, so the side area of the main body frame and the total weight of the main body frame and the excavator can be set smaller, and the device size can be reduced. It can promote weight reduction and weight reduction.

A second aspect of the present invention is a propulsion method for an open tunnel excavator in which a face is excavated by an excavator in a main body frame whose face is open, and a gripper disposed behind the main frame is excavated. The propulsion jack that presses against the inner surface of the hole and takes the reaction force to the gripper is extended to advance the main body frame, and then the pressing of the gripper against the inner surface of the hole is released, and the propulsion jack is contracted to pull the gripper. In addition, when the gripper is pulled, the excavator is inserted into the face and engaged with the face to provide a part of the pulling force.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the propulsion device for a tunnel excavator according to the present invention is of a type having a cylindrical main body frame 2 (shield frame) whose side face 1 is open, that is, a so-called open tunnel excavator. Applied to the machine. A load header 3 is provided as an excavator for excavating the face 1 inside the cylindrical shield frame 2 whose side face 1 is open.

The load header 3 is, as shown in FIG.
It has a cutting drum 4 and a screw drum that are driven to rotate. The cutting drum 4 is provided with a warhead 6 attached to the tip of the screw drum 5, a ribbon body 7 spirally attached to the warhead 6, and the ribbon body 7 which is provided at a predetermined interval to substantially form the face 1. And a drilling pick 8 for drilling. The screw drum 5 has a rotary shaft 10 that is rotationally driven with respect to the support portion 9, and a flight 11 that is spirally attached to a side portion of the rotary shaft 10 and that sends excavated earth and sand backward.

As shown in FIG. 1, the supporting portions 9 of the cutting drum 4 and the screw drum 5 are attached to the main body 12 by the pins 1.
The tilting cylinder 14 is mounted so as to be tiltable, and tilted by the expansion and contraction of the tilting cylinder 14. The main body 12 is attached to a base portion 15 so as to be rotatable about its axis, and the base portion 15 is attached to a base 17 via a connecting member 16. The base 17 is inserted through a guide rod 19 provided on a support rib 18 of the shield frame 2 so as to be movable in the axial direction, and is moved forward and backward as the moving cylinder 20 extends and contracts.

The load header 3 is composed of the moving cylinder 2
The expansion and contraction of 0 moves the whole in the axial direction, and the expansion and contraction of the tilting cylinder 14 tilts the cutting drum 4 and the screw drum 5. By rotating the main body 12 with respect to the base portion 15, the tilting direction is changed (vertical direction). , Horizontal direction, diagonal direction). Thereby, the front surface of the face 1 can be excavated.

The earth and sand excavated by the road header 3 is conveyed backward by a conveyor 21 provided at the bottom of the shield frame 2 as shown in FIG.
In addition, on the upper part of the shield frame 2, the face 1
In order to prevent the roof from collapsing, a hood 23 projecting axially forward by a cylinder 22 is provided so as to be retractable.

A gripper 25 for pressing and releasing the inner surface of the hole 24 is arranged in the hole 24 at the rear of the shield frame 2. The gripper 25 receives a reaction force when the propulsion jack 26 provided in the shield frame 2 is extended to move the shield frame 2 forward.
As shown in FIGS. 5 (a) and 5 (b), the lower shoe 27 placed on the bottom surface of the hole 24, the column 28 standing on the lower shoe 27, and the column 28 engaging with the column 28 Is provided between the upper shoe 30 and the upper shoe 30, which is attached to the upper shoe support portion 29, the upper shoe 30, and the upper shoe 30. , The pressing cylinder 3 for pressing and releasing the ceiling surface of the pit 24
1 and.

As shown in FIG. 1, a plurality of propulsion jacks 26 for advancing the shield frame 2 by applying a reaction force to the gripper 25 are provided inside the shield frame 2 at predetermined intervals in the circumferential direction. . The propulsion jack 26 is
A head portion 32 attached to the shield frame 2,
It has a rod portion 32 protruding and retracting rearward from the head portion 31 and a jack shoe 33 provided at the rear end of the rod portion 32. A force transmission member 34 that transmits the force of the propulsion jack 31 to the gripper 25 is provided between the shoe 33 and the gripper 25.
However, it is detachably attached.

The force transmission member 34 is provided at the rear end of the shield frame 2 provided on the press ring 35 (segment) detachably attached to the jack shoe 33 with bolts and nuts and the inner peripheral surface of the press ring 35. An L-shaped cross-section member 37 bent to avoid interference with the tail seal 36, a frame 38 provided at the rear end of the L-shaped cross-section member 37, and a rear end provided at the top of the frame 38 The upper girder 39 is in sliding contact with the upper shoe 30, and the lower girder 40 is provided at the lower part of the frame body 38 and has its rear end fixed to the lower shoe 27.

A slide mechanism 41 is provided between the frame body 38 and the upper shoe support portion 29 to allow the upper shoe support portion 29 to move up and down with respect to the frame body 38. The slide mechanism 41 is provided on the frame body 38, and has a first bracket 43 to which a pin 42 is attached in the horizontal direction and the upper shoe support portion 2
9 and is provided with an elongated vertical hole 44 through which the pin 42 is inserted.
The second bracket 45 is opened. According to this configuration, the extension force of the propulsion jack 26 is transmitted to the gripper 25 via the upper girder 39 and the lower girder 40, and the contraction force of the propulsion jack 26 is increased by the length of the pin 42 of the first bracket 43 and the second bracket 45. It is transmitted to the gripper 25 through the hole 44.

By the way, when the face 1 is excavated by the load header 3, the pressing cylinder 31 of the gripper 25 shown in FIG. 1 is extended and the upper shoe 30 is attached to the ceiling surface of the hole 24 as shown in FIG. 5B. It should be pressed against. The moving cylinder 20 is contracted while rotating and tilting the cutting drum 4 and the screw drum 5 to excavate the face 1. At this time, in order to prevent the face 1 from collapsing the roof, the hood 23 is projected forward by the cylinder 22 in the axial direction.

When the load header 3 advances by a predetermined stroke, the propelling jack 26 is extended to advance the shield frame 2 as shown in FIG. 2, and the movable cylinder 20 is extended (or loaded) in synchronization with this. The moving cylinder 20 may be extended without hydraulic pressure while the header 3 is in contact with the face 1, and the shield frame 2 while maintaining the position of the load header 3 with respect to the face 1.
Only move forward.

Thereafter, as shown in FIG. 3, the gripper 25
Of the pressing cylinder 31 is contracted to separate the upper shoe 30 from the ceiling surface of the hole 24, and then the propulsion jack 26
To pull the gripper 25 toward the shield frame 2 side. As a result, the initial state is restored, and thereafter, the step of driving and advancing the road header 3 is performed, and the above steps are repeated to excavate and excavate the face 1.

The operation of this embodiment will be described.

When the face 1 is excavated by the load header 3, the above open tunnel excavator extends the pressing cylinder 31 of the gripper 25 shown in FIG. Keep it pressed against the surface. Since the excavation reaction force of the road header 3 is supported on the inner surface of the excavation hole 24 via the gripper 25 by pressing the gripper 25 against the inner surface 24 of the excavation hole in this manner, the shield frame 2 is prevented from retreating due to the excavation reaction force. To be prevented.

Since the shield frame 2 is an open tunnel excavator in which the side of the face 1 is released, the earth pressure of the face 1 does not apply to the front surface of the shield frame 2, and the gripper 25 is inserted into the hole 24 at the time of excavation. When the shield frame 2 is separated from the inner surface, it is not pushed back by the earth pressure of the face 1. Therefore, it is not necessary to equip the shield frame 2 with a front gripper (for countering the earth pressure of the face) to prevent the face 1 from retreating based on the earth pressure.

However, even if the front earth gripper against the earth pressure against the face is not required, the propelling jack 26 once extended as shown in FIG. 2 is shown in FIG. 3 in order to draw the gripper 25 toward the shield frame 2 side. When contracted like this, the gripper 25 may not be attracted to the shield frame 2 side, but the shield frame 2 may be attracted to the gripper 25 side.
It is considered that the shield frame 2 needs a front gripper (for holding the pulling force) for supporting the pulling force of the gripper 25.

In this respect, in the present embodiment, the side area of the shield frame 2 and the total weight of the shield frame 2 and the load header 3 are determined by the frictional resistance between the lower shoe 27 of the gripper 25 and the bottom surface of the digging hole 24 at the time of drawing. Since the friction holding force between the shield frame 2 and the side ground 53 is set to be larger than that, the shield frame 2
Even if it is not equipped with a front gripper for holding the pulling force,
When the propulsion jack 26 contracts, the gripper 25 is reliably pulled toward the shield frame 2 side.

That is, the pulling force (friction resistance) of the gripper 25 applied to the shield frame 2 when the propulsion jack 26 contracts is supported by the side ground 53 as a friction holding force via the side surface of the shield frame 2. However, this friction holding force is correlated with the side area of the shield frame 2 and the total weight of the shield frame 2 and the load header 3.
Therefore, by setting these side areas and total weight as described above, the front gripper can be omitted, and the cost of the device can be reduced and the excavation operation can be simplified.

Further, as shown in FIGS. 2 and 3, when the gripper 25 is pulled, the cutting drum 4 of the load header 3 is engaged with the cutting face 1 (even if the cutting face 1 is penetrated to the screw drum 5). Good), its road header 3
It is desirable to have an anchor function that takes part of the pulling force due to the contraction of the propulsion jack 26. By using the road header 3 as the anchor of the face 1, the friction holding force between the shield frame 2 and the side ground can be set correspondingly smaller, and the side area of the shield frame 2 and the shield frame 2 and the road header 3 can be reduced. This is because the total weight can be made smaller, and the device can be made smaller (shorter machine length) and lighter in weight.

As shown in the figure, the cutting drum 4 is attached to the cutting face 1.
When the spiral ribbon body 7 and the pick 8 shown in FIG. 4 bite into the cutting face 1 to exert an anchoring function when it penetrates to the screw drum 5, the spiral flight 11 bites into the cutting face 1 when it reaches the screw drum 5. It will exert the anchor function.

Further, the cutting drum 4 and the screw drum 5
Unlike FIG. 1 to FIG. 3, the face may be vertically penetrated into the front face of the face 1, but it is preferable that the face is obliquely penetrated into the lower part (or the upper part) of the face 1 as shown in the drawing. Gripper 25
2 is pulled up as shown in FIG.
This is because the unexcavated face 46 below (or above) serves as a strong catch member and can exert a greater anchoring function.

When the soil quality changes and it becomes necessary to stretch the segment on the inner surface of the hole 24, as shown in FIGS. 1 and 6, from the jack shoe 33 of the propulsion jack 26 to the press ring. Remove the members after 35 and carry them out rearward, instead, on the inner surface of the shield frame 2,
A known erector 48 for assembling the segment 47 is attached. Then, the segment 47 is assembled in the shield frame 2 by the erector 48, the jack shoe 33 is pressed against the end of the assembled segment 47, and a reaction force is applied to the existing segment 47 to advance.

In this way, when the hard rock ground (no water flood) and the soft rock ground (water flood) are mixed on the excavation route, the segment 47 may be installed only in the section of the soft rock ground, and the segment 47 in all zones. Since it is not necessary to install 47, cost reduction of the entire system (tunnel) can be promoted. Further, also in the soft rock ground, the front gripper is not required as described above, so that the cost of the device is reduced.

Modifications are shown in FIGS. 7 to 9.

As shown in the figure, in this embodiment, the excavator, which is a component of the present invention, is loaded with the load header 3 of the previous embodiment.
From the previous embodiment, except for the point that the excavator mechanism 3a is changed from the above embodiment, the other parts have the same configuration, and therefore common members are denoted by the same reference numerals and description thereof is omitted, and the shovel mechanism 3a is mainly described. To do.

When the shovel mechanism 3a is used as an anchor, as shown in FIG. 7, a recessed hole 5 for hooking the shovel 49 on the face 1 by the shovel mechanism 3a.
0 is formed, and the shovel 49 is hooked in the recessed hole 50 with the angle fixed. Then, as shown in FIG. 8, the inner surface of the hole 24 is pressed by the gripper 25, the propulsion jack 26 is extended and the moving cylinder 20 is extended, and the shield frame 2 only is held while the position of the shovel mechanism 3a with respect to the face 1 is maintained. To move forward.

After that, as shown in FIG. 9, the gripper 25
The pressure on the inner surface of the hole 24 is released, and then the propulsion jack 26 is contracted to pull the gripper 25 toward the shield frame 2 side. At this time, the shovel 49 has the recess 5
A part of the pulling force is paid by taking a reaction force to the front side wall 51 of 0. That is, since the unexcavated face 52 between the front side wall 51 of the recessed hole 50 and the shield frame 2 serves as a strong catching member, the shovel mechanism 3a can exert a large anchor function.

[0043]

As described above, according to the propulsion device for the open tunnel excavator and the propulsion method thereof according to the present invention,
You can excavate the ground only with the gripper behind the main frame,
Since the front gripper can be omitted, the cost can be reduced and the excavation operation can be simplified.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a propulsion device for an open tunnel excavator according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing the operation of the propulsion device.

FIG. 3 is a side sectional view showing a continuation of the operation of the propulsion device.

FIG. 4 is a perspective view showing a part of a road header as an excavator.

FIG. 5 is a sectional view showing the operation of the gripper, and FIG.
Is a released state, and FIG. 5B is a diagram showing a pressed state.

FIG. 6 is a side cross-sectional view when switching from excavation in which a reaction force is applied to the gripper to excavation in which a reaction force is applied to a segment.

FIG. 7 is a side cross-sectional view showing a modified example in which an excavator mechanism uses a shovel mechanism.

FIG. 8 is a side sectional view showing a continuation of the operation of FIG. 7.

9 is a side sectional view showing a continuation of the operation of FIG. 8. FIG.

[Explanation of symbols]

1 face 2 Shield frame as the body frame 3 Road header as an excavator 3a Excavator mechanism as excavator 24 holes 25 gripper 26 propulsion jack 53 Side ground

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 19, 2002 (2002.6.1)
9)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Title: Propulsion device for open type tunnel machine and its propulsion method

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion device for an open tunnel excavator in which an excavator for excavating a face is provided in a main body frame whose face is open , and a propulsion method therefor.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

The object of the present invention, which was devised in view of the above circumstances, is to provide a propulsion device and a propulsion method for an open tunnel excavator which can omit the front gripper, reduce the cost and simplify the excavation operation. To provide.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

In order to achieve the above object, a first invention is a propulsion device for an open tunnel excavator in which an excavator for excavating a face is provided in a main body frame whose face is open. Then, a gripper that presses and releases the inner surface of the hole is arranged in the rear hole of the main body frame, and a reaction force is applied to the pressed gripper between the gripper and the main body frame to form the main body frame. A propulsion jack that pulls in the gripper that has been moved forward and released is provided, and the friction holding force between the body frame and the side ground is greater than the frictional resistance between the gripper and the inner surface of the hole when pulling the gripper. The side area of the main body frame and the total weight of the main body frame and the excavator are set.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

According to the present invention, the face side of the body frame is
Since it is an open tunnel excavator that is open , the earth pressure of the cutting face is not applied to the front surface of the body frame, and when the gripper is separated from the inner surface of the hole, the body frame is pushed back by the earth pressure of the cutting face. There is no. Therefore, it is not necessary to equip the main body frame with the front gripper (for countering the face earth pressure) for preventing the retreat based on the face earth pressure.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

[0014] The second invention is a propulsion method of an open tunnel excavator for excavating the working face by excavator in the body frame tunnel face side is open, drilling a gripper provided behind the main frame The propulsion jack that presses against the inner surface of the hole and takes the reaction force to the gripper is extended to advance the main body frame, and then the pressing of the gripper against the inner surface of the hole is released, and the propulsion jack is contracted to pull the gripper. In addition, when the gripper is pulled, the excavator is inserted into the face and engaged with the face to provide a part of the pulling force.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

As shown in FIG. 1, the propulsion device for a tunnel excavator according to the present invention is of a type having a cylindrical main body frame 2 (shield frame) whose side face 1 is open , that is, a so-called open type tunnel excavator. Applied to the machine. A load header 3 is provided as an excavator for excavating the face 1 inside a cylindrical shield frame 2 having an open face 1.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

When the face 1 is excavated by the road header 3 in the open tunnel excavator, as described above, the pressing cylinder 31 of the gripper 25 shown in FIG. Keep it pressed against the surface. Since the excavation reaction force of the road header 3 is supported on the inner surface of the excavation hole 24 via the gripper 25 by pressing the gripper 25 against the inner surface 24 of the excavation hole in this manner, the shield frame 2 is prevented from retreating due to the excavation reaction force. To be prevented.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

Further, the face 1 side of the shield frame 2 is opened.
Since a release has been open tunnel excavator, never earth pressure of the working face 1 is applied to the front surface of the shield frame 2, when moved away the gripper 25 from the inner surface of Juana 24 during excavation, the shield frame 2 Face It is not pushed back by the earth pressure of 1. Therefore, it is not necessary to equip the shield frame 2 with a front gripper (for countering the earth pressure of the face) to prevent the face 1 from retreating based on the earth pressure.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction content]

[0043]

As described above, according to the propulsion device and the propulsion method for an open tunnel excavator according to the present invention,
You can excavate the ground only with the gripper behind the main frame,
Since the front gripper can be omitted, the cost can be reduced and the excavation operation can be simplified.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG. 1 is a side sectional view showing a propulsion device for an open tunnel excavator according to an embodiment of the present invention.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takanobu Miki             11-11 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima             Heavy industry Aichi factory (72) Inventor Katsuto Ichikawa             Shimizu Construction 1-3-2 Shibaura, Minato-ku, Tokyo             Within the corporation (72) Inventor Ritsu Takagi             Shimizu Construction 1-3-2 Shibaura, Minato-ku, Tokyo             Within the corporation F term (reference) 2D054 AC01 AC12 AD16 BA23

Claims (3)

[Claims] 1. A body frame whose face is open,
A propulsion device for an open tunnel excavator provided with an excavator for excavating a face, wherein a gripper for pressing and releasing the inner surface of the drill hole is arranged in the rear hole of the main body frame, and the gripper and the main body are arranged. A propulsion jack is installed between the frame and the gripper that pressed the gripper to move the main frame forward, and to pull the released gripper forward. Rather than the frictional resistance between the gripper and the inner surface of the hole when pulling it. A propulsion device for an open tunnel excavator characterized in that the side area of the main body frame and the total weight of the main body frame and the excavator are set so that the friction holding force between the main body frame and the side ground is increased. . 2. The propulsion device for an open tunnel excavator according to claim 1, wherein the excavator has an anchor function for penetrating engagement with a face when pulling the gripper to take part of a pulling force. 3. A propulsion method for an open tunnel excavator in which a face is excavated by an excavator in a main body frame having a released face side, wherein a gripper arranged at the rear of the main body frame is pressed against an inner surface of a drill hole, Extend the propulsion jack that takes the reaction force to the gripper and advance the main body frame,
Then, release the pressure on the inner surface of the hole of the gripper,
A releasable tunnel excavation characterized in that the propulsion jack is contracted to draw a gripper, and the pulling machine is used as an anchor for penetrating engagement with a face when pulling the gripper to take part of pulling force. How to propel the machine.