JPS5811299A - Tunnel drilling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tunnel excavation machine suitable for excavating collapsible rock 6 (a tunnel) such as a fractured zone.

First, a conventional tunnel boring machine equipped with a gripper was used as the first
This will be explained with reference to the figure and FIG. 2 1r.

A gripper 3 operated by a hydraulic cylinder 4 is installed on the four circumferences 6ζ of the outer frame 2, which is a square cylindrical body, and the outer frame 2 IC
6 (inner frame 5 is inserted so as to slide in the axial direction. The flange portion 6ζ at the tip of the inner frame 5 is rotatably supported by a cutter head 7 equipped with a cutter 6 on a bearing. 6C between the front end of the outer frame 2 and the flange of the inner frame 5
A thrust cylinder 8 that slides the inner frame 5 is installed. The drive shaft 7a of the cutter head 7 is inserted into the hollow part of the inner frame 5, and its end is connected to a gear transmission device rotated by a drive shaft 9.

By operating the hydraulic cylinder 4 to press the gripper 3 against the tunnel wall l, the support between the outer frame 26 and the tunnel wall xtc is increased. The cutter head 7 is pressed against the face by a thrust cylinder 81ζ and is rotated via a drive shaft 7a that rotates in conjunction with a drive machine 91m to excavate the face. , in the case of a fracture zone, 6ζ is the case when there is no shield to prevent the tunnel outer wall from collapsing, so the tunnel outer wall collapses, and the tunnel wall may be buried in earth and sand, or the tunnel wall may not collapse. It is impossible to move forward due to lack of supporting force.6
It had serious drawbacks such as C.

FIG. 3 shows an example of a conventional mud shield excavator equipped with a rock cutter. In the front part 4C of the shield body 12, a cutter head 7 to which a cutter 6 for rock excavation is attached is mounted on a bearing 1.
It is rotatably supported via 3. Shield body 1
The forward movement of step 2 is performed by extending the shield jack 11 while taking a reaction force with the segment 10. The face 15 is excavated by the cutter 6 without rotation of the cutter head 7. The excavated waste is transported through the fluid transport pipe 14 (
In excavation work for rocks that require more discharge, the cutter 6 wears out and very often has to be replaced during excavation. The cutter head 7 is always pressed against the face 15 by the shield jack 11.
5 is being excavated, there is no space between the face 15 and the cutter head 7 to replace the four cutters 6,
Replacement work is extremely difficult. Further, if the cutting resistance is extremely large, a large thrust force of the shield jack 11 is applied to the bearing 13, and the bearing 13 may be damaged.

FIG. 4 shows a conventional mud water shield excavator which eliminates the above-mentioned drawbacks.

The central shaft 17 is supported by a bulkhead integrated with the shield main body 16 so as to rotate and slide (through a bearing 24jG-), and a cutter head 22 with a cutter 23 attached is connected to the tip thereof. The center shaft 17 rotates through a pinion 20 and a gear 21 connected to the drive [19], and slides through the thrust cylinder 18.The gear 21 is fixed to the center shaft 17, and the pinion 2o is connected to the drive a1.
It is attached to the output shaft of No. 19. The pinion 2o has a width corresponding to the stroke of the thrust cylinder 18 so as to be able to mesh with the social gear 21.

C17) In the shield excavator, the cutter head 22 can be moved back and forth CC by the thrust cylinder 18 independently of the advancement of the shield body 16, so the cutter 23
When replacing the cutter head 22, 6C moves the cutter head 22 backward,
A space is secured between the face 25 and the cutter head 22, allowing for easy work. In addition, the shield body 16
Since the cutter head 22 is moved forward by the shield jack 26 and the cutter head 22 is moved forward solely by the thrust cylinder 18, no excessive thrust is applied to the bearing 24.

As mentioned above, the drawbacks of the shield tunneling machine shown in FIG. In order to act on the central axis 17, it is necessary to increase the diameter of the central axis 17. Therefore,
The space around the shaft is narrowed, making it difficult to arrange other equipment (1) Also, the bearing 24 has a large capacity, making it difficult to arrange it. It becomes one ζ.

This invention allows the cutter to be easily replaced,
Another object of the present invention is to provide a tunnel excavating machine that does not require making the drive shaft of the cutter head thicker.

Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 5 to 7.

A bulkhead 33 is integrally provided at the front portion of the shield body 27, and a support frame 47 is integrally provided at a portion behind the bulkhead 33. bulkhead 3
3, a water pipe 51 is attached to the upper part C, a discharge pipe 52 is attached to the lower glasses part, and a front glasses support cylinder 28 having a circular cross section is fixed to the center part. . Support frame 2
The central part 6ζ of 7 is a rear glasses support cylinder 32 with a square cross section.
is fixed. A first sliding cylinder 30 with a square cross section and a circular flange 34 at its tip is slidably fitted into the rear support cylinder 32, and the front support cylinder 28 #C is the flange 34 and the rear support cylinder 32
fixed to the wall of the first sliding cylinder 30 between the
A second slidable cylinder 29 whose outer periphery has a circular cross section is slidably fitted therein. A seal 31 is attached to the front support cylinder 286C to prevent muddy water, dirt, etc. from leaking behind the bulkhead 33.

A cutter head 3 with a cutter 37 attached to the flange 34
6 is rotatably supported via a bearing 35, and one end of the drive shaft 39 inserted into the first sliding cylinder 30 is connected to the central part Jm of the cutter head 36 through a spline 40 [ There is. The other end of the drive shaft 39 is connected to the first sliding cylinder 3
Bearing 426ζ installed in housing 41 fixed at 0
A gear 43 is fixed to the end thereof. The gear 43 meshes with a pin 44 attached to the output shaft 6C of the drive machine 45 installed in the housing 41. A thrust cylinder 46 is installed on the support frame 47 in parallel with the drive shaft 39, and its piston rod is connected to the housing 41 via a pin. 7
A seal #C between the flange 34 and the center step of the cutter head 36 is a seal 3 that prevents muddy water, shear, and foreign matter from entering the bearing 35.
8 is installed.

Note that 48 is a shield jack that moves the shield main body 27 forward while taking a reaction force with the segments 49, and 50 is an erector that assembles the segments 49.

When the drive unit 45 is driven, the drive shaft 39 is rotated via the pinion 44 and the gear 43, and the spline 4o is rotated.
The cutter head 36 is rotated through the . While applying thrust to the cutter head 36 by the thrust sill 46 via the housing 41, the first sliding cylinder 30, and the bearing 35,
The cutter head 36 is rotated and the cutter 37 excavates. The excavated waste is discharged by fluid transport through the discharge pipe 52.

Thrust due to the excavation reaction force transmitted from the cutter head 36,
The bending force is applied to the second sliding cylinder 29 and the second sliding cylinder through the bearing 35.
It is supported by a slidable cylinder 30. The drive shaft 39 transmits rotational force to the cutter head 36.

For geological formations where the pit wall is likely to collapse in a fracture zone, the shield body 27 and the segment 49 prevent the pit wall from collapsing, and the segment 49 receives the reaction force of the propulsion of the excavator via the shield jack 48.

When the cutter 37 is worn out and needs to be replaced, the 6ζ
After the cutter head 36 moves forward to excavate up to the face F in the figure, the thrust cylinder 46 is extended to move the cutter head 36 backward, and the connection between the face F and the cutter head 36 is removed.
To secure a space for the replacement work, the muddy water from transporting the waste is removed, and a worker enters the front side of the cutter head 36 through a manhole (not shown) provided in the bulkhead 33 and cutter head 36, and then removes the cutter 36. will be replaced.

In a normal excavation process, the cutter head 36 advances to the face F, and when the excavation is completed, the shield body 27 is advanced by the shield jack 48 while taking reaction force with the segments 49. Next, the process moves to an excavation process in which the cutter head 36 is advanced by the thrust cylinder 46.

According to the invention 6 described above, the following effects can be obtained.

(1) Since the cutter head can be moved forward and backward separately from the advancement of the shield body, the working space required for changing the cutter can be easily secured between the face and the cutter head.

(2) The thrust and bending force of the cutter head are controlled by the second sliding cylinder;
By supporting the cutter head with the first sliding cylinder and having the rotational force of the cutter head wait on the shaft, the structure can ensure sufficient strength of the sliding cylinder supporting the cutter head, resulting in reliability. In addition, the drive shaft can be made thinner.

(3) Since a larger number of bearings 35 can be installed compared to conventional shaft drives, reliability can be improved.

(4) Since the cutter head is moved forward by a thrust cylinder separate from the shield jack, the large thrust of the bearing 356ζ shield jack that supports the cutter head is not applied, preventing damage to the bearing 35 and extending its life. Significantly lengthens the volume.

(5) The shield structure allows smooth excavation work even in spring water layers and fractured zones.

[Brief explanation of drawings]

Figure 1 is a cross-sectional side view showing a conventional tunnel boring machine equipped with a gripper, Figure 2 is a cross-sectional view of Figure 1, Figure 3 is
Fig. 4 is a cross-sectional side view showing a different conventional shield tunneling machine, Fig. 5 is a cross-sectional front view showing a set of embodiments of the present invention, Fig. 6 is a cross-sectional view taken along the line -W in Fig. 5, and Fig. 7. is ■−■ in Figure 5.
0 27 - Shield main body, 28 - Front support cylinder,
29..Second sliding cylinder body, 30@.First sliding cylinder body, 32..Rear support cylinder body, 33.Φ bulkhead, 34.Fist flange, 35.-Bearing, 36-
e cutter head, 37・e cutter, 39・・drive shaft, 40@・spline, 41・・housing,
42@-Bearing, 43--Gear, 44@-Binion, 45--Driver, 46--Thrust cylinder 47--Support frame, 48--Shield jack, 49--Segment, 51-- water pipe,
52...Discharge pipe z6 Fig. 5 Fig. 6 Fig. 7

Claims (1)

[Claims] The front support cylinder (28) is fixed to the bulkhead (33) integrated with the shield body (27), and the bulkhead (33)
) The rear support cylinder (32) is attached to the support frame (47) which is integrated with the shield body (27) at the rear of the shield body (27).
is fixed, and the second movable cylinder (30), which has a flange (34) at the tip, is attached to the rear support cylinder (32) so that it can slide for a long time but not rotate. Fit the front glasses support cylinder (28)! (, flange (34) and rear support cylinder (
32) and the wall 6 of the first sliding cylinder (30)
ζ Fit the fixed second slidable cylinder (29), and attach the cutter head (36) to the flange (34) via the bearing (35).
) is rotatably supported by a rotatable shaft, and the drive shaft (
39), and the other end of the drive shaft (39) is connected to a transmission mechanism that rotates from a drive machine (45) jr, and the first sliding cylinder (30) is connected to a shield jack (48). A tunnel excavating machine characterized in that it is configured to be slid by a thrust cylinder (46) separate from the tunnel excavator.