JPH0332620Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a tunnel excavator.

(Prior Art) Fig. 5 shows an outline of a conventional open type tunnel excavating machine that is not equipped with an outer shell (shield) on the outer periphery of the tunnel excavating machine. The drive gear 5 attached to the main shaft is supported by a bearing 4 built into the outer casing 3 of the main shaft, and is fixed to the drive shaft of the motor by driving a rotary drive motor 6. The cutter head 2 is rotated through the meshing gear 7 to drive and rotate the cutter head 2. A front guidance 8 that contacts the excavation wall is attached to the outer casing 3, and a main frame 9 with a rectangular cross section is connected to the rear end.
It passes through the inside of the spherical bushing 12 and is supported by a vertically moving jack 13 . Further, between the spherical bush portion 12 and the gripper frame 11, a rolling correction jack and a left/right moving jack are provided, although not shown. The gripper shoe 10 and the outer casing 3 are connected by a plurality of thrust jacks 14. 15,1 in the figure
6 and 17 indicate the output conveyor.

In the above-mentioned tunnel excavator, when correcting bending or rolling during excavation or performing curved excavation, the main frame 9, which is rigidly connected to the cutter head 2, is moved up and down by the vertically moving jack 13 or the like at the rear gripper section. It depends on the method of forcibly displacing the vehicle in the direction in which it is intended to steer.

Next, Fig. 6 shows an outline of a conventional tunnel excavator with a shield, which is equipped with an outer shell (shield) on the outer periphery of the tunnel excavator.
2. The rear body 23 is joined together via seals 24 and 25 so as to be freely flexible. A cutter head 27 in which a roller cutter 26 is disposed on the front side of the front body 21
is attached to the front body 21 with a bearing 29 via a cylindrical support 28. Rotary drive motor 30
The power is transmitted to the cutter head 27 via a pinion 31 fixed to the drive shaft of the motor and a ring gear 32.
to drive. Seals 33 and 34 are interposed between the cutter head 27 and the front body 21.

A front gripper 35 is provided on the circumference of the front body 21.
A suitable number of these are installed.

The middle barrel 22 consists of an outer barrel 36 and an inner barrel 37 that slides in the axial direction inside the outer barrel 36. A key 38 is disposed in the inner barrel 37 and fits into a keyway 39 of the outer barrel 36. to prevent mutual rotation. Outer cylinder 36 and inner cylinder 37
A seal 40 to maintain watertightness and a metal 41 to enable sliding are interposed between them. Note that an appropriate number of direction control jacks 42 are installed between the inner cylinder 37 and the front body 21, and the front body 21
is designed to be able to swing relative to the inner cylinder 37.

The rear body 23 is equipped with a plurality of main grippers 43 and a shield jack 45 that presses segments 44 assembled on the shaft wall as the excavator excavates.

A bending jack 46 is provided between the front end of the rear body 23 and the end of the outer cylinder 36 of the middle body 22 to enable bending.
is installed. Furthermore, the rear body 23 and the middle body 22
A rolling correction jack 51 is connected between.

Further, a thrust jack 47 is installed between the front body 21 and the rear body 23. In the figure, 48 indicates a screw conveyor, and 49 indicates a conveyor.

Tunnel excavation by the excavator 20 is performed by rotating the cutter head 29 with a rotary drive motor 30 and using a roller cutter 26 or a bite cutter (not shown), and the excavated earth and stones are thrown into a hopper 50 and carried out by a screw conveyor 48 and a conveyor 49. Ru.

Propulsion of the excavator 20 in a fractured zone or soft soil layer is achieved by extending the shield jack 45 attached to the rear body 23 to move the segment 44 to the spreader 45.
Press a to do this. To propel the excavator 20 in a hard rock layer, the main gripper 43 is pressed against the mine wall, and when the thrust jack 47 is extended, the front shell 21 moves forward together with the middle shell 22 via the direction control jack 42. When one stroke of digging is thus completed, the front gripper 35 is pressed against the tunnel wall and the main gripper 43 is retracted. Therefore, when the thrust jack 47 is reduced, the rear barrel 23 moves forward together with the middle barrel 22 because it is connected by the folding jack 46.

In the curve progression, the amount of extension of each direction control jack 42 is made different, and the front body 21 is swung relative to the middle body 22, and at the same time, the thrust jack 4 is adjusted at necessary locations.
Extend 7.

Rolling correction jack 51 is cut head 2
The excavation reaction force 9 is transmitted to the main gripper 43 attached to the rear trunk 23, and the rolling of the front trunk 21, middle trunk 22, and rear trunk 23 is corrected.

(Problems to be solved by the invention) However, the conventional tunnel excavating machine shown in Fig. 5 has a structure that requires separate directional control devices for three different types of steering: vertical, horizontal, and rolling. It becomes more complex and larger.

Since the main frame receives bending moment due to steering force as well as rotational torque, it needs to be large in terms of strength.

Since the main frame is placed near the central space of the tunnel excavator, it is difficult to secure a working space, making it particularly unsuitable for small-diameter tunnel excavators.

Since the main frame is rigidly connected to the cutter head, the amount of displacement of the rear equipment relative to the angular displacement of the cutter head is large, and the radius in which it can be turned is greatly limited. There were other drawbacks.

Furthermore, in the conventional tunnel excavating machine shown in FIG. 6, when performing curved propulsion, there is a flexible connection device that allows the front body to swing relative to the middle body, and a flexible connection device that allows the middle body to slide relative to the rear body. The excavator is equipped with a separate rolling correction device and a rolling correction device, which increases the length of the excavator.

The direction control jack that swings the front shell relative to the middle shell, and the thrust jack that assists it, are installed parallel to or inclined to the axial direction of the excavator, but the moment that swings the front shell is Not the best placement for generating force. There are drawbacks such as.

(Means for Solving the Problems) The present invention was proposed to solve the above problems, and includes a structure in which a cutter head and a front gripper are mounted between the front and rear shells. a steering barrel interposed to be slidable in the axial direction and rotatable relative to the front end of the rear body; a thrust jack interposed between the front body and the rear body; and the steering body and the rear body. This tunnel excavator is characterized by a steering jack installed circumferentially between the tunnel excavators. An object of the present invention is to provide an improved tunnel excavating machine in which the moment necessary for control can be easily obtained.

(Function) Since the tunnel excavator according to the present invention is constructed as described above, the ground is excavated by the cutter head mounted on the front body, and the intervening machine is installed between the front body and the rear body. When the thrust jack is extended, the front shell moves forward while sliding against the steering barrel interposed between the front shell and the rear shell, and the tunnel excavator excavates.

In addition, the turning motion of the excavator is achieved by using a steering body interposed between the rear body and the front body, which is interposed in the circumferential direction between the rear body and the steering body, which is rotatable relative to the front end of the rear body. This is done by extending and retracting the steering jack, which tilts the cutter head of the front cylinder through the steering cylinder in a desired direction.

At this time, if necessary, the thrust jack is extended at necessary locations simultaneously with the extension and contraction of the steering jack.

When one stroke of excavation by the tunnel excavator is completed, the front gripper of the front body is pressed against the tunnel wall and the thrust jack is retracted, thereby moving the steering body and the rear body forward.

Furthermore, when the excavator rolls during excavation work, the rolling is corrected by extending and retracting the steering jack to rotate the steering body relative to the rear body.

(Effects of the invention) According to the invention, as described above, by incorporating the turning steering body of the excavator between the front body and the rear body,
Compared to conventional excavators, which have a flexible connecting device that allows the front body to swing relative to the middle body, a device that slides the middle body relative to the rear body, and a rolling correction device, each is provided separately. can be shortened.

Furthermore, by arranging the steering jack interposed between the steering body and the rear body in the circumferential direction, the steering jack also has a rolling correction function, simplifying the structure. It is something that can be transformed into

(Example) The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 is an overall vertical sectional view of a tunnel excavating machine according to the present invention, in which a front body 62 and a rear body 63 are flexibly joined via a seal 64 in the axial direction.

The front body 62 has a cutter head 67 on which a roller bit 65 and a cutter bit 66 are mounted.
The cutter head 67 has a cylindrical support 68 and a bearing 6.
9 and is supported by the front body 62. Reference numeral 72 denotes a rotary drive motor, the power of which is transmitted to the cutter head 67 via a reduction gear 73, a pinion gear 71, and a ring gear 70. The pinion gear 71, ring gear 70 and bearing 69 are protected by seals 74 and 75 interposed between the cutter head 67 and the front body 62.

An appropriate number of front grippers 76 are mounted on the circumference of the front body 62. The front gripper 76 has a structure that can be expanded and contracted in the radial direction, and by expanding and contracting this, the front body 62 can be fixed to the shaft wall.

An inner cylinder 77 is rigidly connected to the rear part of the front body 62, and the inner cylinder 77 has a bearing 79 and a key 80.
It has a structure that allows it to slide in the axial direction within the steering barrel 78. At the front end of the steering body 78, as shown in FIG.
It has a spherical bearing 81 and is rotatably supported at the front end of an outer cylinder 82 of the rear body 63. Steering body 78
A bearing 83 is provided between the inner cylinder 77 of the front body 62, and seals 64 are provided at both ends of the bearing 83. Also,
The steering barrel 78 is provided with a keyway 84, which is fitted into the key 80 to prevent mutual rotation.

The rear body 63 is equipped with a plurality of main grippers 85 that expand and contract in the radial direction and a shield jack 87 that presses segments 86 that are assembled to the shaft wall as the excavator 61 excavates.

The rear fuselage 63 and the front fuselage 62 are joined by an appropriate number of thrust jacks 88 that are equally spaced on the circumference, and between the rear fuselage 63 and the steering barrel 78, there is a A suitable number of controlling steering cylinders 89 are installed as shown in FIG. 90,9 in the figure
Reference numeral 1 denotes a bracket for mounting a steering cylinder 89 disposed on the rear body 63 and the steering body 78, respectively;
2 is a hopper, 93 is a screw conveyor, and 94 is a conveyor.

Since the illustrated embodiment is constructed as described above, soft geological formations and fractured zones are excavated mainly by the cutter head 67 rotated by the rotary drive motor 72 and cutter head 66. The excavated material enters a hopper 92 and is carried out by a screw conveyor 93 and a conveyor 94.

The excavator 61 is propelled by pressing the shield jack 87 against the segment 86 via the spreader 87a because the main gripper 85 cannot absorb the excavation reaction force due to the soft ground. The excavator 61 moves forward by selectively expanding and contracting a plurality of steering jacks 89 provided between the steering barrel 78 and the rear barrel 63 while pushing the segment 86 with a shield jack 87, thereby connecting the bearings 79, 83 and the front. Inner cylinder 7 of body 62
This is done by tilting the cutter head 67 in the desired direction of the curve via the arrow 7. Furthermore, when the steering jack 89 is extended and contracted, the thrust jack 88 can also be extended at necessary locations as needed. Note that since the steering jack 89 is disposed parallel to a plane perpendicular to the axis 61a of the excavator, it can easily generate a force for tilting the cutter head 67.

In addition, when excavating a solid rock layer, Katsutahedsu 67
The rotation drive motor 72 rotates the roller bit 65.
excavate with. The excavator 61 is propelled by pressing the main gripper 85 against the shaft wall because the shaft wall is made of solid rock and the main gripper 85 can take up the excavation reaction force. Segment 86 is therefore no longer needed. When the thrust jack 88 is extended, the front torso 6
2 is a bearing 8 attached to the inner cylinder 77 and the steering body 78.
3, it moves forward while sliding on the bearing 79 while being prevented from rotating by the key 80. When one stroke of digging is thus completed, the front gripper 76 of the front shell 62 is pressed against the shaft wall, the main gripper 85 is retracted, and the thrust jack 88 is reduced, so that the steering shell 78 and the rear shell 63 move forward. Excavation is carried out by repeating the above operations. The song is segment 8
The process can be performed in the same manner as described above, except that the main gripper 85 or the front gripper 76 is used to take the reaction force instead of pressing the gripper 6.

Steering jack 89 is cut head 67
In addition, when the excavator 61 rolls during excavation, the steering body 78 and the outer cylinder 82 rotate in the direction of the arrow in FIG. 3. Rolling correction is performed by expanding and contracting the steering jack 89 so that the rotation is corrected.

According to the illustrated embodiment, the length of the tunnel excavator can be reduced by incorporating the turning steering body 78 between the front body 62 and the rear body 63 of the excavator. By arranging a steering jack 89 interposed between the steering barrel 78 and the rear barrel 63 in the circumferential direction, the steering jack 89 can perform the rolling correction function of the excavator. This allows the structure to be simplified.

FIG. 4 shows another embodiment of the present invention.
This differs from the previous embodiment in that instead of rigidly connecting the inner cylinder 104 to the inner cylinder 104, a center-folding jack 101 and a seal 102 are attached to allow the inner cylinder to be bent. It has the advantage of being easy to turn.

In the figure, parts equivalent to those of the above embodiment are given the same reference numerals.

[Brief explanation of drawings]

Fig. 1 is a longitudinal side view showing an embodiment of a tunnel excavator according to the present invention, Fig. 2 is a longitudinal side view showing details of the steering barrel attachment part, and Fig. 3 is a view taken along the arrow direction in Fig. 1. , FIG. 4 is a vertical cross-sectional view showing another embodiment of the tunnel and excavator according to the present invention, and FIGS. 5 and 6 are vertical cross-sectional views showing each example of a conventional tunnel excavator. 62... Front body, 63... Rear body, 67... Cut head, 76... Front gripper, 77... Inner cylinder of front body, 78... Steering body, 80... Key, 81
... Spherical bearing, 84 ... Keyway, 88 ... Thrust jack, 89 ... Steering jack.

Claims (1)

[Scope of utility model registration request] A steering barrel is interposed between a front barrel and a rear barrel on which a cutter head and a front gripper are mounted, and the steering barrel is interposed so as to be slidable in the axial direction with respect to the front barrel and rotatable with respect to the front end of the rear barrel; A tunnel excavator comprising: a thrust jack interposed between the rear body; and a steering jack disposed circumferentially between the steering body and the rear body.