JPH083518Y2 - Tunnel excavator - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention is for excavating a tunnel having a particularly sharp curve in a tunnel excavator having a relatively long length, which is divided into a front body, a middle body, and a rear body, and each body is flexibly joined. The present invention relates to a tunnel excavator capable of (hereinafter also referred to as sharp bend excavation).

[0002]

2. Description of the Related Art As a tunnel excavator of this type, there is an excavator disclosed in Japanese Patent Publication No. 62-32319. In this excavator, although not shown, the front body, the middle body, and the rear body are flexibly joined, and the middle body is formed of an outer cylinder and an inner cylinder slidably inserted in the outer cylinder. The propulsion jack is provided between the front body and the rear body.

[0003]

In the conventional tunnel excavator disclosed in the above publication, for example (in the embodiment), a concrete structure of the joining structure of the front body and the middle body is provided in the rear end portion of the front body. The front end of the body is fitted and connected to each other with multiple direction control jacks, so the front body can be bent not only horizontally but also vertically, but the bendable angle is small. It is difficult to excavate a steep tunnel.

Further, when excavating a curved tunnel, in the excavator of the type described above, the extension amounts of the left and right direction control jacks provided between the front body and the middle body are made different from each other, so that The work is performed in a posture in which the head is tilted horizontally (pivoting), but in order to maintain such a swinging posture, the front torso of the front torso does not depend on the holding force of the multiple direction control jacks. Spacers are fitted in several places in the gap (one side) between the rear end (ring girder) and the front end face of the middle case. This work is performed manually by the operator, but the position S where the spacer is fitted is outside the direction control jack (18) as shown by the broken lines in FIGS. 3 (b) and 3 (c). Since it is close to the inner surface of the shield plate (also called the skin plate) of the body, it is difficult and time consuming, including the work of removing the spacer.

The present invention has been made in view of the above-mentioned points , and it is possible to increase the bending angle of the front body with respect to the middle body , enable sharp excavation , and bend the front body set to the middle body.
Tons for easy attachment / detachment of spacers to hold the force
Intended to provide flannel excavator .

[0006]

To achieve the above object, a tunnel excavator according to the present invention comprises: a) a front body, a middle body, and a rear body each having a cutter head at a tip and a front gripper on an outer peripheral surface. A rear body having a gripper on the outer peripheral surface is flexibly joined, and a middle body is composed of an outer cylinder and an inner cylinder slidably inserted in the outer cylinder. In a tunnel excavator in which a propulsion jack is provided between the b), b) the front end of the outer peripheral surface of the middle case is formed into a spherical shape and fitted into the rear end of the front case, and The upper and lower parts of the central part and the upper and lower parts of the central part of the rear part of the front torso are connected by a vertical pin so that they can be bent in a horizontal direction, and the front part and the middle part of the front part of the front part of the middle part A bending posture holding mechanism for the trunk is provided, and c) the front end of the rear trunk and the rear end of the middle trunk are connected by link members and Bendably connected to the horizontal and vertical directions by a pair of vertical pins arranged at both ends thereof, d) the bending position holding mechanism, the direction control jack
And it is arranged almost parallel to the inside of this jack, both ends
Link members that are pivotally connected by vertical pins.
And e) the vertical pin on the side of the middle body is a link member.
Insert it into the formed slot and insert it in the space between the slot and the vertical pin.
I am trying to fit a spacer .

[0007]

[0008]

According to the tunnel excavator of the present invention having the above-mentioned structure, like the conventional excavator, the rear gripper is pressed against the tunnel wall to fix the rear body in place, and the jack for propulsion is installed. The tunnel excavation work is performed by rotating the cutter head at the tip while advancing the front body by extension. Especially when excavating a curved tunnel, the front body should be bent and held horizontally with respect to the middle body by using the left and right bending posture holding mechanism between the front body and the middle body together with the pushing of the propulsion jack. As with normal (straight) tunnel excavation, excavation can be performed by extending the propulsion jack while rotating the cutter head. In addition, the bending (pivoting) angle of the front body with respect to the middle body is such that the front body turns horizontally around the vertical pin, and with this turning, the rear end of the inner peripheral surface of the front body By inclining along the spherical surface of the front end of the outer peripheral surface, interference between both ends is avoided, so that the front torso can be bent to a considerably large angle. Therefore, it is possible to excavate a tunnel having a sharp curve as compared with the conventional excavator.

Further, the rear body is pulled forward by contracting the jack for propelling with the front body fixed to the fixed position by the front gripper. At this time, the rear body has the link member to the middle body (rear part). By flexing freely along the curved surface of the tunnel through it, excavation of a sharp curve is facilitated. .

Further, by making the extension amounts of the left and right direction control jacks different, or by using this operation and the pushing of the propulsion jack together, the front body is bent with respect to the middle body, and the worker in this bent state By fitting a spacer having a corresponding size into the space between the elongated hole of the link member and the vertical pin, the bent state (posture) of the front body with respect to the middle body is maintained. The work of fitting the spacer and the work of removing the spacer from the elongated hole are easily performed by the worker because the position of the link member is inside the excavator (close to the passage).

[0011]

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

FIG. 1 is a central longitudinal sectional view of a rock excavating machine for a rock mass according to the present embodiment, FIG. 2 is a central longitudinal sectional view showing a state in which a middle body of the tunnel excavating machine of FIG. 1 is extended, and FIG. Y
3 is a cross-sectional view taken along the line Y and an enlarged view of the elongated hole portion of the link member.
3 (a) shows straight traveling, FIG. 3 (b) shows rightward traveling, and FIG. 3 (c) shows leftward traveling.

As shown in FIG. 1, the main body 1 of the tunnel excavator comprises a hollow cylindrical body and is divided into a front body 2, a middle body 3 and a rear body 4. A front end portion 3b of the shield plate 3a of the middle body 3 is formed into a spherical surface that is convex outward in the radial direction over the entire circumference, and is fitted into the rear end portion of the shield plate 2a of the front body 2 so as to be mutually bendable. A seal member (not shown) is provided over the entire circumference between the shield plate 3a of the middle case 3 and the shield plate 2a of the front case 2. Then, in the ring girder 2c of the front body 2,
Convex connecting members 6 are respectively provided on the upper end portion and the lower end portion of the center thereof so as to project rearward, and in the annular front wall 3c of the middle case 3, a concave connecting portion is formed between the upper end portion and the lower end portion of the center thereof. The members 7 are respectively provided so as to project toward the front, and the vertical pins 8 are inserted through the front and rear connecting members 6 and 7 in series so that the front body 2 and the middle body 3 can be bent in the horizontal direction. It is connected.

In the annular rear wall 3g of the middle body 3,
Recessed connecting members 9 are respectively provided on the upper end and the lower end of the center thereof so as to project rearward, and in the annular front wall 4c of the rear case 4, a recessed connecting member is provided on the upper end and the lower end of the center thereof. 10 are each projected toward the front. The concave connecting member 9 on the side of the middle body 3 and the concave connecting member 10 on the side of the rear body 4
A plate-shaped link member 11 is fitted and inserted between and, and the vertical pins 12 are respectively provided at both ends of each link member 11.
・ It is pivotally supported by 13. On the other hand, the hole 11a of the link member 11 into which the front vertical pin 12 is inserted is formed as an elongated hole, and the middle body 3 and the rear body 4 are axially movable (expandable) to some extent, so that the horizontal body It is flexibly connected in the vertical and vertical directions.

The inner cylinder 3 has a double shield structure in which an inner cylinder 3e and an outer cylinder 3f are slidably superposed in the axial direction.
The e side is connected to the front body 2, and the outer cylinder 3f side is connected to the rear body 4, respectively. Further, the rear wall 2c of the front body 2 and the front wall 4c of the rear body 4
And multiple (in this embodiment, two on the left and two on the left and four in total)
Of the inner cylinder 3e and the outer cylinder 3 of the middle barrel 3 are connected to each other by the expansion and contraction operations of the jacks 14 for propulsion.
As f slides on each other, the length of the overlapping portion changes, the length of the middle body 3 changes, and at the same time, the distance between the front body 2 and the rear body 4 changes.

Rear grippers 15 are arranged on both sides of the rear body 4 so as to be able to move in and out from the shield plates 4a through cylinder devices (not shown). Further, a plurality of front grippers 16 are also arranged on the front body 2 so as to be able to move in and out from the shield plate 2a through the cylinder device 16a.

As shown in FIG. 3, bending posture holding mechanisms 17 for the front body 2 and the middle body 3 are provided on the left and right sides of the rear end of the front body 2 and the front end of the middle body 3, respectively. Each bending posture holding mechanism 17
Is composed of a direction control jack 18 and a pair of upper and lower plate-shaped link members 19, and the link members 19 are arranged substantially parallel to the inside of the direction control jack 18. The bracket 20 is fixed to the ring girder 2c of the front case 2, and the bracket 21 is fixed to the front part of the inner cylinder 3e of the middle case 3,
Both ends of the direction control jack 18 are pivotally supported on the outer sides of the brackets 20 and 21 by vertical pins 20a and 21a.

Further, both ends of the link member 19 are pivotally supported by vertical pins 20b and 21b on the inner sides of the brackets 20 and 21, respectively. Slots 19a are formed at the rear ends of the upper and lower link members 19, and the vertical pins 21b are fitted into the slots 19a. Further, the vertical pin 21b in the slot 19a
There are several types of spacers 22 (at least three types) that can be fitted in the space of and, and as shown in FIG. 3 (a), two spacers 22a having the same shape when traveling straight are When turning right, the spacer 22b
22c, as shown in FIG. 3 (c), when the left turn, right link member 1
The spacers 22b and 22c are fitted to 9 to maintain the space. It should be noted that the link members 19 on the opposite side are also shown in FIG. 3 (c) in order to securely maintain the bent postures of the front body 2 and the middle body 3.
The phase-symmetrical spacers 22b and 22c are fitted into the left and right elongated holes 19a.

A cutter head 25 is rotatably supported at the tip of the front body 2. The supporting structure of the cutter head 25 is an outer peripheral supporting type in which a peripheral portion of the cutter head 25 is rotatably supported by a bearing 26. The cutter head 25 is geared by a drive motor (not shown) arranged in the front body 2. 27
Is rotated through. A large number of roller cutters 25b are mounted on the face plate of the cutter head 25, and the reference numeral 25b 'in FIGS. 1 and 2 represents an outline connecting the blade edges of the roller cutter 25b.

Next, the excavation operation of the tunnel excavator according to the above-described embodiment of the present invention will be described with reference to FIGS.

FIG. 1 and FIG. 2 show a working state for newly excavating a straight tunnel. In the state shown in FIG. 1, the tunnel excavator 1 projects a rear gripper 15 and presses it against a pit wall. 4 is fixed, the cutter head 25 is rotated, the jack 14 for propulsion is gradually extended, and the cutter head 25 is advanced with the front body 2. As a result, as shown in FIG. 2, the inner cylinder 3e side of the inner cylinder 3 slides forward with respect to the outer cylinder 3f, the overlapping portions of both cylinders 3e and 3f are reduced, and the inner cylinder 3 extends.

When the propulsion jack 14 is extended to the maximum extent, the front gripper 16 of the front body 2 is pushed out against the mine wall to fix the front body 2 and the rear gripper 15 of the rear body 4 is retracted. The rear jack 4 is pulled toward the front body 2 side by contracting the rear jack 14. At this time, the outer cylinder 3f slides forward with respect to the inner cylinder 3e of the middle body 3
The number of overlapping points of e · 3f increases and the inner body 3 contracts. After that, the rear gripper 15 of the rear body 4 is pressed against the overhang wall to fix the rear body 4, and the front gripper 16 of the front body 2 is retracted. And the cutter head 2
The excavation work is performed by gradually extending the propulsion jack 14 while rotating 5 and repeating the above procedure.

When excavating a curved tunnel, for example, when the vehicle turns right, the two propelling jacks 14 on the right side are extended and, as shown in FIG. The direction control jack 18 on the left side in the middle is extended, and the front body 2 is pivoted to the middle body 3 to the right around the upper and lower vertical pins 8 (FIG. 1) and bent. Then, in a state where the front body 2 is bent to a predetermined angle, the operator inserts a spacer 22 of a corresponding size into the space between the vertical pin 21b in the elongated holes 19a of the left and right link members 19.
b. 22c is fitted to maintain the bent state (posture) of the front body 2 with respect to the middle body 3. In such a work of fitting the spacer 22 by the worker or removing the spacer 22 from the elongated hole 19a, the position of the link member 19 is inside the direction control jack 18 and faces the passage in the excavator body 1. , Done easily. The rest is normal (straight)
Similarly to the tunnel excavation, the propulsion jack 14 is extended while the cutter head 25 is rotated, so that excavation can be performed.

Particularly when excavating a tunnel with a sharp curve, two propulsion jacks 14 on one side are extended and the front body 2 and the middle body 3 are extended in the same manner as the above-described curved excavation.
By extending the direction control jack 18 on one side between them, the front body 2 is swung in one direction about the vertical body pins 8 on the upper and lower sides with respect to the middle body 3 and is bent. The excavation work may be carried out, and the excavation work may be placed on a curved trajectory, and the front body 2 may be gradually bent until the predetermined bending angle is reached.

The bending movement of the rear body 4 with respect to the middle body 3 when moving in the curved tunnel is such that the rear body 4 follows the forward movement of the middle body 3 and the front and rear vertical pins 12 through the link member 11 By bending around the center of the curve 13, it is smoothly performed along the curved surface of the tunnel. When it is necessary to forcibly bend the middle body 3 and the rear body 4, the rear gripper 15 on one side of the rear body 4 (the side opposite to the bending direction) is extended outward. The direction of the rear body 4 may be changed. Since the outer cylinder 3f of the middle case 3 bends and follows the curve of the tunnel as the front case 2 and the inner case 3e of the middle case 3 move forward, no special operation is required. However, when the curve is steep, it is better to limit the extension amount of the propulsion jack 14 so that the length of the middle barrel 3 does not become too long.

By the way, in the excavation of a curved tunnel by the tunnel excavator of the present invention, it is possible to excavate a tunnel having a sharp curve of about 40R (1 in the conventional device).
00R).

[0027]

[Effect of the Invention] As is clear from the above explanation,
The tunnel excavator of the present invention has the following effects.

(1) In a tunnel excavator having a structure in which a front body, a middle body, and a rear body are flexibly joined, since the swinging angle of the front body relative to the middle body can be increased, sharp excavation is possible.

[0029] (2) In addition, easy attachment and detachment of the spacer for holding the swing attitude of the front torso set to medium cylinder, the workability is improved.

[Brief description of drawings]

1 is a central longitudinal sectional view showing an embodiment of a tunnel excavator of the present invention.

FIG. 2 is a central vertical cross-sectional view showing a state in which an inner body of the tunnel excavator of FIG. 1 is extended.

3 is a cross-sectional view taken along the line YY of FIG. 1 and an enlarged view of an elongated hole portion of a link member of a bending posture holding mechanism, FIG. 3 (a) is straight ahead, and FIG. 3c shows a left turn.

[Explanation of symbols]

 1 Tunnel Excavator Main Body 2 Front Body 3 Middle Body 4 Rear Body 6, 7, 9, 10 Connecting Member 8, 12, 13, 21b Vertical Pin 11, 19 Link Member 14 Propulsion Jack 15, 16 Gripper 17 Bending Posture Holding Mechanism 19a Slotted hole 22 Spacer 25 Cutter head

Claims (1)

[Scope of utility model registration request] 1. A front body having a cutter head at the tip and a front gripper on the outer peripheral surface, a middle body, and a rear body having a rear gripper on the outer peripheral surface are flexibly joined together, and the middle body is In a tunnel excavator including an outer cylinder and an inner cylinder that is slidably inserted in the outer cylinder, and a propulsion jack is provided between the front body and the rear body, the front end of the outer peripheral surface of the middle body The part is formed into a spherical shape and fits into the rear end of the front case, and the center top and bottom of the front end of the middle case and the center top and bottom of the rear end of the front case can be bent horizontally with vertical pins. The front body of the rear body and the rear body of the front body are provided with a bending posture holding mechanism for the front body and the middle body on the left and right between the front end of the middle body and the rear end of the front body. A link member and a pair of vertical pins arranged at both ends of the link member so that it can be bent horizontally and vertically , The bending position holding mechanism, the direction control jack, the di
Almost parallel to the inside of the jack, both ends are
When composed with a link member that is pivotally connected by a vertical pin
By the way, the vertical pin on the side of the middle body is in the long hole formed in the link member.
Insert the spacer into the space between the slot and the vertical pin.
A tunnel excavator characterized by the fact that they are combined .