JPH1136787A - Creased-type tunnel boring machine and withdrawal method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the production rate of an excavation muck from being excessive, and execute woke for curved line parts of a small radius of curvature. SOLUTION: The shield frame 10 is divided into a front drum part 11 situated at the excavation side and a rear drum part 12 situated at the tunnel side, and the front drum part 11 and rear drum part 12 are joined in a bending manner with each other, herein, the front drum part 11 includes a substantially cylindrical inner shell frame 14 having a cutter frame 13 attached at the side of a natural ground and an outer shell frame 15 being located in divided relation in the peripheral direction at a predetermined distance at the outside part of the inner shell frame 14 for encircling this. The outer shell frame 15 is secured via a connection mechanism 16 to move to and away from the inner shell frame 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending machine for excavating a tunnel having a bent portion.

[0002]

2. Description of the Related Art As shown in FIG. 3, there is known a conventional tunneling machine capable of bending and excavating. This type of tunnel excavator includes a front body 1 on which a cutter frame 5 is mounted, a rear body 2 that swingably supports the front body 1, and a front body 1 with respect to the rear body 2. A rocking mechanism (center-bending jack) 3 for relatively rocking, and is used for excavating a curved portion of the tunnel 8 as shown in the figure.
Is operated so that the front trunk portion 1 and the rear trunk portion 2 can be folded. In the drawing, reference numeral 4 denotes a shield jack for excavating by taking a reaction force on the segment, 6 denotes a copy cutter for overdigging, and S denotes a segment assembled in an excavated tunnel.

[0003] In this center-folding tunnel excavator, extra dug- ing necessary for constructing the curved portion of the tunnel 8 is performed by projecting the copy cutter 6 from the outer peripheral portion of the cutter frame 5. Is soft, but it can not be dug with a copy cutter on the ground where rocks and huge rocks are mixed.

Conventionally, in order to construct a curved portion on such a ground, a roller bit provided at an outer edge portion of a cutter frame of a center-bending tunnel excavator is largely protruded outward so that a tunnel is formed. Excavation is used to secure extra digging.

[0005]

However, as described above, in the conventional center-bend tunnel excavator, since the roller bit is extended outward to perform the excavation, the diameter of the straight portion is larger than the predetermined diameter. Since the tunnel is excavated, there is a problem that generation of excavation debris increases.

Further, the overhang amount of the roller bit cannot be made too large due to the mechanism, so that a large excess digging amount cannot be secured. Therefore, even when the front trunk 1 and the rear trunk 2 are folded, the front trunk 1 or the rear trunk 2 comes into contact with the inner wall of the tunnel, and the radius of curvature of the center line of the tunnel cannot be reduced. There's a problem.

The present invention has been made in view of the above circumstances, and provides a center-bend tunnel excavator capable of constructing a curved portion having a small radius of curvature without an excessive amount of excavation debris. The purpose is to do.

[0008]

According to the present invention, a shield frame is divided into a front body located on the excavation side and a rear body located on the tunnel side. In a middle bend tunnel excavator in which a rear trunk portion and a rear trunk portion are connected to each other freely, the front trunk portion includes a substantially cylindrical inner shell frame having a cutter frame attached to the ground side, and an outer portion of the inner shell frame. An outer shell frame arranged at predetermined intervals and circumferentially divided so as to surround the outer shell frame, and the outer shell frame is attached to the inner shell frame via a connection mechanism so as to be able to approach or separate from the inner shell frame. It is characterized by having.

The outer shell frame is constituted by an outer shell member divided into upper and lower pieces and left and right pieces along the circumferential direction of the inner shell frame. Before being connected to the inner shell frame by the connection mechanism so as to be able to approach or separate in the radial direction from the inner shell frame, and the outer shell member of the lower piece portion being fixed at a predetermined distance from the inner shell frame, A substantially cylindrical inner shell frame having a cutter frame rotatably mounted on a portion thereof, and an outer shell frame disposed substantially along the circumferential direction of the inner shell frame outside the inner shell frame; The frame is preferably attached to the inner shell frame via a connecting mechanism so as to be able to approach or separate from the inner shell frame.

[0010] When the middle bend tunnel machine is withdrawn, the connection between the inner shell frame and the outer shell frame by the connecting mechanism may be cut off to recover the inner shell frame.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the embodiment, the center-folding tunnel excavator according to the present invention has a front trunk 1 in which the shield frame 10 is located on the excavation side.
1 and a rear trunk portion 12 located on the tunnel side, and the front trunk portion 11 and the rear trunk portion 12 are flexibly connected to each other by a swing mechanism 23. In the figure, reference numeral 24 denotes a mini tail frame.

The swinging mechanism 23 includes a hinge portion 24 provided on the rear body portion 12 and a convex portion 25 provided on the rear end of the front body portion 11.
The front body 11 and the rear body 1 are slidably inserted.
2 are connected by a center bending jack 26.

A cylindrical portion 12a having a diameter smaller than the inner diameter of the tunnel is formed in the rear body portion 12, and the cylindrical portion 1a is also formed in the front body portion 11.
A cylindrical portion 11a is formed corresponding to 2a. The cylindrical portion 12a of the rear body portion 12 is inserted into the cylindrical portion 11a of the front body portion 11 so as to be relatively swingable. These cylindrical portions 11
a, a sealing member 29 made of a brush, a ring-shaped seal, or the like, is disposed in close contact with the cylindrical portions 11a, 12a, whereby the front trunk portion 11 and the rear trunk portion 12 are relatively positioned. Even if it swings, it has a so-called shield structure in which watertightness between the inside and outside of the front body portion 11 and the rear body portion 12 is ensured.

The front body 11 has a cutter frame 13 on the ground side.
And a substantially cylindrical inner frame 14 integrally connected to the cylindrical portion 11a, and the inner frame 14
And an outer shell frame 15 which is arranged at a predetermined interval and is divided in the circumferential direction so as to surround the outer frame. The cutter frame 13 is provided with a plurality of roller bits 22 facing the ground side.

The outer shell frame 15 includes an upper piece 18, a lower piece 19, and a right piece 2 along the circumferential direction of the inner shell frame 14.
0, an outer shell member divided into four parts of a left side piece 21. The upper piece 18 and the left and right pieces 20 and 21 of the outer shell member are attached to the inner shell frame 14 via the connecting mechanism 16 so as to be able to approach or separate therefrom. The lower piece 19 of the outer shell member is attached to the inner shell frame 14. It is fixed at a predetermined interval.

The connecting mechanism 16 is as follows. The upper piece 18 and the left and right pieces 20, 21 of the outer shell member are supported by a support jack 33 so as to be able to approach and separate from the inner surface of the tunnel. A guide post 37 extending in the radial direction of the inner shell frame 14 is provided upright on the outer surface of the inner shell frame 14, and the upper end portion 18 and the left and right half portions 20 of the outer shell member are provided at the tip of the guide post 37. , 21 are formed so as to be slidable, and when the support jack 33 approaches or separates the upper portion 18 and the left and right portions 2 of the outer shell member.
0 and 21 are guided by the guide post 37.

An end plate frame 12b having a diameter slightly smaller than the inner diameter of the tunnel is fixed to the rear end of the rear trunk portion 12, and a reaction force is applied to the segment S near the periphery of the end plate frame 12b. A plurality of propulsion jacks 27 for advancing the front body 11 and the rear body 12 are attached along the peripheral edge of the end plate frame 12b. End plate frame 12b
A substantially circular opening 12 d is formed at the center of the cutter frame 13, and a belt conveyor 28 for discharging excavation slips through the opening 12 d is arranged toward the immediate inside of the cutter frame 13.

The cutter frame 13 has a chamber 30 in which the excavated waste is temporarily stored.
The shears temporarily accommodated in the chamber 30 with the rotation of the cutter frame 13 are transported upward together with the chamber 30 and when the chamber 30 comes close to the upper side,
From the conveyor 28. In the figure, reference numeral 31 denotes a motor for driving the cutter frame 13 to rotate.

An erector device 4 for assembling a segment S on the inner surface of the tunnel is provided on the end plate frame 12b of the rear trunk portion 12.
0 is attached, and the segment S can be assembled by moving the erector 41 with the erector jack 42.

Next, the operation of the half-turn tunnel excavator according to the embodiment will be described.

In order to construct the straight portion of the tunnel, the propulsion jack 27 is extended while the cutter frame 13 is rotated by the motor 31, and a reaction force is applied to the segment S so that the front trunk portion 11 and the rear trunk portion 12 are moved forward. To promote. Thus, a tunnel is formed by the roller bit 22 attached to the cutter frame 13.

At this time, the support jack 33 is extended, and the upper piece 18 and the left and right pieces 20 and 21 of the outer shell member are moved in the radial direction of the tunnel along the guide post 37 so as to be positioned along the inner surface of the tunnel. Let it. This prevents the inner surface of the tunnel from collapsing.

After a predetermined excavation, the segments S are sequentially assembled annularly behind the rear trunk portion 12 by the erector device 40, and sequentially cover the inner surface of the tunnel.

Next, in order to construct a curved portion of the tunnel, particularly a sharply curved portion, the middle bent jack 26 corresponding to the inside of the curved portion among the plurality of middle bent jacks 26 is contracted, so that the front trunk portion is formed. 11 is swung about the hinge portion 24 with respect to the rear trunk portion 12 so as to be in a middle bent state, and the propulsion jack 27 is extended to excavate a sharp curve portion.

Here, the roller bits 22 provided at the corners of the cutter frame 13 allow the excavation work to be performed, and the construction of the curved portion is facilitated. However, if a sharp curve portion having a smaller radius of curvature is to be excavated. , Outer shell frame 1
The left and right pieces 20 and 21 of 5 come into contact with the inner surface of the tunnel. Therefore, even if the front body part 11 and the rear body part 12 are excavated in a bent state, the radius of curvature of the curve part that can be constructed is limited, and as a result, it is difficult to construct a tunnel with a smaller radius of curvature. Was.

However, in this embodiment, the right and left pieces 20 and 21 of the outer shell member are supported by the support jack 33 so as to be separated from the inner surface of the tunnel. By contracting the jack 33 and retreating the left and right pieces 20 and 21 of the outer shell member slightly from the inner surface of the tunnel (see the dotted line in FIG. 2), the contact with the inner surface of the tunnel can be eliminated. This makes it possible to further increase the angle of the middle bend, and it is possible to excavate a tunnel having a smaller curvature than in the case where the center is simply bent.

As described above, since the left and right pieces 20 and 21 of the outer shell member are retracted only at the curved portion, the excavation diameter of the straight portion of the tunnel and the excavation diameter of the curved portion can be made the same. The amount of surplus digging can be made constant, and the amount of waste discharged does not become excessive.

Since the upper piece 18, the left and right pieces 20, 21 are guided by the guide posts 37 formed on the inner shell frame 14, the inner surface of the tunnel of the upper piece 18, the left and right pieces 20, 21 of the outer shell member. Can be smoothly and reliably approached or separated from the camera.

Since the front body 11 and the rear body 12 are made water-tight by the sealing member 29, even if groundwater leaks from the ground, it does not enter the inner shell frame 14 and excavation work can be performed. It can be done safely.

Since the conveyor 28 is provided inside the inner shell frame 14, the worker can approach the cutter frame 13 through the installation space of the conveyor 28, and can exchange the roller bit 22 and the mechanical equipment. Inspection can be performed very easily.

Further, when withdrawing the folding machine of the present embodiment, for example, the anchor rod is attached to the upper piece 1.
8. While penetrating into the surrounding ground from inside the through holes formed in the left and right piece portions 20 and 21 to fill and bury the inside of the tunnel, the connection between the inner shell frame 14 and the outer shell frame 15 by the connecting mechanism 16 is cut off. Accordingly, a part of the lower piece 19 is melted off, and only the inner shell frame 14 can be recovered.

That is, in the conventional tunnel excavation, the middle bend tunnel excavator is disassembled and carried out. However, the center bend tunnel excavator of the present embodiment eliminates the trouble of disassembly and is simple and easy. Some of the equipment can be diverted to other works. Thereby, the construction cost can be reduced.

In the present embodiment, the center-folding tunnel excavator has the center-folding jack 26 disposed outside the inner shell frame 14. However, even if groundwater leaks into this portion, the excavation work is not hindered. Will not leave. In addition, if there is an installation space inside the inner shell frame 14, the middle folding jack 26 may be installed inside the installation space.

In the above embodiment, the outer shell frame 15 is formed by dividing the upper and lower pieces 18 and 19 and the left and right pieces 20 and 21 into four parts. However, the outer frame 15 can be retracted from the inner surface of the tunnel. If so, the number of divisions can be set appropriately. In addition, unlike the above embodiment, it is not necessary to make the outer shell member retreat substantially all around like the upper piece 18 and the left and right pieces 20 and 21, and the outer shell member and the inner surface of the tunnel are in contact with each other. What is necessary is just to be able to evacuate only a part.

In the present embodiment, the inner shell frame 14 has a watertight structure. However, when excavating the ground where there is no fear of leakage of groundwater, the watertight structure is not required at all.

[0037]

As described above, according to the present invention, it is possible to construct a curved portion having a small radius of curvature without an excessive amount of excavation debris.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a folding machine according to an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of the arrow II in FIG.

FIG. 3 is a view showing a conventional tunnel machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Front trunk | drum 12 Rear trunk | drum 13 Cutter frame 14 Inner shell frame 15 Outer shell frame 16 Connection mechanism 18 Upper piece part 20, 21 Right and left piece part 23 Swing mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomofumi Ishino 11-1 Kitahama-cho, Chita-shi, Aichi Prefecture Harima Ishikawajima Heavy Industries Co., Ltd.

Claims (3)

[Claims] 1. A middle bend tunnel in which a shield frame is divided into a front trunk portion located on a digging side and a rear trunk portion located on a tunnel side, and the front trunk portion and the rear trunk portion are flexibly connected to each other. In the excavator, the front body portion is a substantially cylindrical inner shell frame having a cutter frame attached to the ground side,
An outer shell frame disposed on an outer portion of the inner shell frame at predetermined intervals and circumferentially divided so as to surround the inner shell frame, and the outer shell frame can be approached or separated from the inner shell frame. Folding tunnel excavator, characterized in that it is attached to the vehicle via a connecting mechanism. 2. The outer shell frame is composed of an outer shell member divided into upper and lower pieces and left and right pieces along the circumferential direction of the inner shell frame, and outer shells of the upper piece and the left and right pieces are provided. The members are connected to the inner shell frame by the connection mechanism and are configured to be able to approach or separate in the radial direction from the inner shell frame, and the outer shell member of the lower piece is fixed at a predetermined interval from the inner shell frame. 2. The tunnel folding machine according to claim 1, wherein 3. The method according to claim 1, wherein when the folding machine is retracted, the connection between the inner shell frame and the outer shell frame by the connecting mechanism is disconnected. A method for withdrawing a middle-bend tunnel excavator, comprising collecting an inner shell frame.