JPS58207495A - Shield excavator which can freely be widened and excavate - 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 shield excavator capable of widening excavation.

When laying power cables, communication cables, etc. in underground tunnels, it is necessary to widen a portion of the tunnel at each cable joint to secure space to allow cable splicing work. As shown in Fig. 1, with conventional shield tunneling machines, it is not possible to partially widen the part 2 in the radial direction of the tunnel hole during excavation of the tunnel 1, and when widening is required, freezing method or chemical There is a need for ground improvement using methods such as pouring, as well as auxiliary construction methods such as the spectacle method and the excavation of vertical shafts.

However, it is impossible to excavate a vertical shaft to widen the joint part of the electric power 1 communication cable in urban areas where buildings are densely packed, and the freezing method described above increases construction costs and is also dangerous. There are disadvantages associated with this.

The present invention was made in order to solve the above-mentioned problems, and it is possible to widen a part of a cable tunnel with a relatively small excavation diameter using only a shield excavator without using any auxiliary construction methods, and It is an object of the present invention to provide a shield excavator capable of widening excavation, which can assemble segments using an erector even in a widened part.

Its features are that the widened rear torso is attached to a part of the periphery of the rear half of the shield main body so that it can move forward and backward in the radial direction of the shield main body, and the erecta drum support is installed inside the latter half of the shield main body as the widened rear torso. This is a shield excavator that can freely move in the same direction and widen and excavate, and in addition, an appropriate number of widening over-drilling means that can move forward and backward in the same direction are housed in the front of the widened rear trunk described above. This is a shield excavator equipped with a widened front body and capable of widening excavation.

Hereinafter, the present invention will be explained in detail based on examples thereof.

Figure 11: Honmasu! 0 enlargement 1 width portrait +7) 'i
-) An overall vertical sectional view of the b-do excavator 10, showing the shield body 1.
The widened front trunk 1 rib is provided on a part of the circumference of the front half trunk 12a of the first half.

This width-enlarging front body 13 includes a cutter disk 15 for widening and over-excavation protruding from the front so as to be close to the cutter disk 14 attached to the shield body 11, and a screw conveyor 16 for earth removal that is integrally attached to the cutter disk 15. As shown in FIG. 4, an appropriate number of widening extra-drilling means 18, each consisting of the cutter disk 15 and a drive motor 17 for rotating the screw conveyor 16, are arranged in an arcuate manner. Note that the power of the drive motor 17 is transmitted to the drive shaft 15a of the cutter disc 15 via a chain 19, for example.

This widened front body 13 has an outer shell 20 as shown in FIG.
A box-shaped guide 21 is fixed parallel to the vertical axis 11a of the shield main body 11 on the outer periphery extension of the shield main body 11, and this is inserted into the space 23 in the guide body 2a formed on the left and right sides of the shield main body 11 in the direction of the arrow 24. It is slidably inserted into the

On the other hand, the front and rear sides of the widened front body 13 are arranged within a guide body 221) consisting of a partition wall 25 formed in the cross section of the shield body 11 and a support plate 27 integrated with the partition wall 25 with a cylindrical body 26. It is supported so that it can move forward and backward in any direction.

Therefore, the widened front trunk 13 has guide bodies 22a and 22
The guide body 22 has a sealed box-like structure and is kept watertight by a seal 30 (see FIG. 4) interposed between the shield body 11 and the shield body 11.

The widened front body 13 described above is guided by the guide body 22 and moved forward and backward by the front body widening jack 29 attached to the lower surface of the holding plate 28 to which the guide 21 is fixed and to the shield body 11. is installed on.

In addition, in the above explanation, the widened front body 13 is referred to as the shield body 11.
Although it is provided on the top of the screen, it goes without saying that it may be mounted on the side or bottom. Therefore, it goes without saying that it is possible to advance in the radial direction and carry out extra excavation for widening at any location in the circumferential direction.

A device 35 for driving the cutter disc 14 is attached to the shield main body 11 inside the widened front barrel 13 described above. This drive device 35 is attached to the shield main body 11 and the widened front body 13.
The shield body 11 is further narrowed by providing
It is designed to be compact so that it can be installed in the center of the gear, and is configured to prevent variations in the tooth contact of the gear, which will be described later.

That is, the drive shaft 14a of the cutter disk 14 is mounted in a bearing 86.
A disc-shaped internal gear holder 39 having an internal gear 38 attached thereto is fixed to the rear end of the drive shaft 14a. Furthermore, a motor support 42 rotatably supported by bearings 40 and 41 is attached to the rearmost end of the drive shaft 14a, and an appropriate number of drive motors 44 are mounted via a pedestal 43. There is. A pinion 45 fixed to the output shaft of the drive motor 44 meshes with the internal gear 38.

In FIG. 2, 48 is a copy cutter device provided on the cutter disk 14, 49 is an agitator that stirs the excavated earth and sand in the cutter chamber 50, and 51 is a tension bar that prevents rotation of the motor support 42. 52 in Figure 3
53 is a mud feeding pipe, and 53 in FIG. 4 is a mud draining pipe. Note that when the machine is not a mud water type shield excavator, the mud feeding pipe 52 and the agitator 49 are not necessary, and a conveyor for carrying out excavated soil may be installed in place of the mud draining pipe 53.

In addition to the widened front body 13 described above, a widened rear body 55 is provided at the rear of the widened front body 13 in the rear half body 12b of the shield body 11.

As shown in FIG. 5, this widened rear body 55 has an advancing/retracting guide 5 on its inner surface for moving in the same direction as the widened front body 13.
6 and a guide rod 58 fixed to the forward/backward guide 56 via a bracket 57 is provided upright.

This guide rod 58 is for sliding an erector drum support 72 of an erector 7o, which will be described later, and the other end is slidably inserted into a guide hole 59a of a guide body 59 fixed to the rear body portion 12b of the shield main body. It is inserted. This guide body 59 has a fixed guide 59b, which is slidably inserted into the advance/retreat guide 56, and inside these guides 59b, 56, a rear body widening jack 60 extends the width of the rear body 55 at both ends. It is attached and inserted into the rear half body portion 12b of the shield main body.

The outer shell 63 of the widened rear trunk 55 is an arc-shaped body having the same dimensions as the outer shell 20 of the widened front trunk 13, and a guide plate 64 (see FIG. 2) that can slide on the rear surface of the partition wall 25 is provided on the front surface of the outer shell 63. attached,
Also, on the outer circumference extension of the outer shell 63 is a side plate 65 (see Fig. 5).
is slidably fitted into the outer shell 66 of the shield body rear half body 12b, and a seal 67 is interposed therebetween, thereby making the widened rear body 55 and the shield body rear half body 121 watertight.

As shown in FIG. 2, an erector 70 for assembling the segments 69 is installed in the shield body rear half body 12b where the widened rear body 55 is located, and an erector drum support body rotatably and slidably supports the erector drum 71. As shown in FIG. 5, the guide rod 58 is slidably inserted through the guide hole 78a of the support portion 73 projecting left and right, and is guided and supported.

In addition, one end of the support portion 73 is connected to the guide body 5.
An erector moving jack 74 attached to the holder 9 is incorporated as shown in FIG. The erector 70 can be moved in the same direction as the widened rear drum 55 by the erector moving jack 74, and can be rotated via the pinion 76 by the erector rotation motor 75 attached to it without the erector drum support 72 rotating. There is no difference from the conventional erector except that the large gear 7rQ erector drum 71 is rotated and the erector telescopic jack 78 is rotated in a desired direction.

In addition, 79 is a shield jack that presses the segment 69 assembled at the rear part to take a digging reaction force, and an appropriate number of these jacks are attached to the rear part of the bulkhead 25 and the widened rear part 55 within the circumference of the rear half body part 12b of the shield main body. fixed at the end.

The present invention operates as follows in the above configuration.

When excavating without widening extra excavation, the front shell widening jack 29 and the rear shell widening jack 60 are reduced and the widening front shell 13 and the widening rear shell 55 are housed in the shield body 11.

A suitable number of drive motors 44 mounted on the outer periphery of the motor support 42 are operated, and the pinion 45. Internal gear 38. Drive shaft 14 via internal gear holder 39
When a is rotated, the cutting face 80 is moved by the cutter disc 14.
can be drilled.

At this time, since the motor support 42 is attached to the drive shaft 14a with the bearings 40 and 41, the drive shaft 14a can rotate, and the rotational reaction force of each drive motor 44 is transmitted between the motor support 42 and the shield body 14. The motor support body 42 is supported by a tension bar 51 provided between the drive shaft 14 and
It does not rotate with a. As described above, this drive device 35 has a drive motor 44 mounted on the drive shaft 14a of the cutter disk 14, so even if the drive shaft 14a is bent during excavation, the internal gear 38 and pinion 45
Although not shown in the drawings, the meshing remains unchanged, and there is no variation in tooth contact that occurs in conventional drive devices in which the drive motor is fixed to the shield body via a partition or the like.

Moreover, since the drive motor 44 is also arranged integrally and compactly with the drive shaft 14a, it is extremely easy to use it in a relatively small-diameter shield excavator where the space inside the shield body 11 is narrow due to the widened front body 13 as described above. It can be installed, and can be stored and installed in the shield main body 11 inside the guide body 22 for the widened front fuselage 13.

In addition, the shield jack 7 attached to the rear of the bulkhead 25
The ability to dig by pressing the segment 69 with 9 is no different from a conventional shield excavator.

Next, in case of extra cutting to widen the width, if necessary, the copy cutter device 48 mounted in the cutter disk 14 is first used to carry out extra digging. At this time, the cutter 48a that is projected in the radial direction is rotated in accordance with the rotation of the cutter disk 14, but when the cutter 48a is made to protrude in the radial direction, the cutter 48a is projected when the cutter 48a is at a position where extra digging is required, and is retreated at a position where extra digging is not necessary. Excavation with the cutter disk 15 becomes easy, and the face 80 does not collapse on other circumferences.

Next, extend the front trunk widening jack 29 and slide the guide 21 with the two guide bodies of the shield main body 11.
3 is made to protrude outward in the radial direction of the shield body 110 as shown in FIGS. At this time, the tip end 21a of the guide 21 is still attached to the guide body 2a as shown in FIG.
Since it is fitted inside, the widened part 13 does not swing left or right during extra digging and is firmly supported.

The drive motor 17 is operated and the cutter disk 15 for widening extra digging and the screw conveyor 1 are connected via the chain 19.
By rotating the shaft 6, the tunnel wall can be widened and excavated only partially outward in the radial direction.

At this time, if the widening wall is softened by the copy cutter 48a, it is easy to widen the tunnel wall in the radial direction using the extra widening cutter disk 15 and the screw conveyor 16, and if the desired widening amount is obtained, the shield While being propelled by the jack 79, forward widening excavation can be performed together with excavation by the cutter disc 14.

The radial widening excavation reaction force is received by the front body widening jack 29, and the forward reaction force is received by the shield jack 79 via the partition wall 25 of the guide body 22. Furthermore, even if a force is applied in any direction to the widened front body 13, it is firmly supported by the guide body 22 having the closed box structure through the outer shell 20 and guide 21 of the widened front body 13. , widening excavation will not be impossible.

The excavated earth and sand is put into the cutter chamber 50 and discharged in the form of muddy water to the rear outside of the machine via the mud discharge pipe 53.

In the above-mentioned operation, the outer side of the guide 21 of the widened front trunk 13 and the outer member 22c of the guide body 22a of the shield main body 11
The interposed seal 30 prevents dirt from getting caught in the sliding surface.

Next, the widened rear body 55 is attached to the widened part of the widened front body 13 that has been over-excavated by the widening extra digging means 18 using the rear body widening jack 60.
Advance as shown in Figure and Figure 7. At this time, the advance/retreat guide 56 moves along the fixed guide 59b of the guide body 59.
Further, the guide body 58 fixed to the bracket 57 moves along the guide hole 59a of the guide body 59. Therefore, even if the widened rear body 55 receives a force from the wall of the widened part of the tunnel, the reaction force can be taken by the rear body widening jack 60, and the forward/backward guide 56, which is still in the fitted state, can absorb the force in any direction. is received by the fixed guide 59b, and the widened rear trunk 55 is firmly held and does not interfere with the segment assembly work described below.

The erector 70 is arranged as shown in FIG.
To assemble the segments in the widened shield main body rear half body 12b, first extend the erector telescopic jack 78 to grip the segment 69a, and then move the erector rotation motor 7
5, the erector drum 71 is rotated within the erector drum support 72 via the large gear 77.

Next, when the erector moving jack 74 shown in FIG. 6 is extended to move the erector drum support 72 along the guide rod 58, the gripped segment 69a
It is located at the top of the widening indicated by the imaginary line in FIG. When the segments 69 are sequentially assembled up to the top of the left and right walls, the erector moving jack 74 is reduced and the erector 70 is returned to its original position, and by rotating the erector drum 71 at that position, the lower and lowest parts of the left and right walls are moved. Assemble segments 69 on the arc wall. It should be noted that the order of assembling the segments 69 is not limited to the above-mentioned order, and it goes without saying that the wall surfaces can be assembled in a different order.

During such segment assembly work, the aforementioned seal 67 is also inserted between the widened rear body 55 extending in the radial direction from the shield body rear half body 121) and the outer shell 66 of the shield body rear half body 12I). Since spring water and the like are prevented from entering the shield main body 11 by seals provided at other locations as necessary, the segment assembly work at the widened portion is not hindered.

As explained in detail above, the present invention is provided with an enlarged rear body that can move forward and backward in the radial direction of the shield body and an erector that is movable in the same direction. It can be carried out. In addition, a widened front body that can move forward and backward in the same direction as the widened rear body is provided in front of the widened rear body, and a widening extra digging means is attached to it, and it is fitted to the shield body so that it can be firmly supported. It is possible to widen a portion of a tunnel with a relatively small diameter using a single shield excavator without using any other construction methods.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a tunnel in which a widening part number has been formed, and Fig. 2 is an overall vertical cross-sectional view of a shield tunneling machine capable of widening excavation, showing a state in which the widening front shell and the widening rear shell are housed in the shield main body. Figure 3 is a cross-sectional side view of the ■-drinking cotton line in Figure 2, and Figure 4.
The figure is a one-sided view of the cross section taken along the l-11I line in Figure 2, and Figure 5 is a side view of the section taken along the line l-11I in Figure 2.
One-sided view of the IV-IV line cross section in the figure, Figure 6 is the ■ - of Figure 2
One side view of the V-section, FIG. 7 is a vertical sectional view showing the state in which the widened front shell and the widened rear shell have advanced in the radial direction, and FIG.
FIG. 9 is a cross-sectional view showing the movement of the erector. 11...Shield body, 12a ・First half body, 12b
...Late half of the body, 13.. Widening front body, 14. Cutter disk, 15.. Cutter disk for widening extra digging, 16..
・Screw conveyor, 17... Drive motor, 18・
・Expanding extra digging means, 22.59 ・Guide body, 29・
・Front body widening jack, 3o... Seal, 55... Widening rear body, 56... Advance/retreat guide, 58... Guide rod, 60
- Rear body widening jack, 67...Seal, 72...Erector drum support, 74...Erector moving jack Patent applicant: Tokyo Electric Power Co., Ltd. Patent applicant: Kawasaki Heavy Industries, Ltd. Representative Patent attorney: Katsutoshi Yoshimura (and 1 others) Figure 3 Figure 4

Claims (2)

[Claims] (1) An enlarged rear shell is provided on a part of the rear half of the shield main body, and an advancing/retracting guide and a sliding guide rod for the erector drum support are erected on the inner surface of the enlarged shell. A guide body fixed to the rear half of the shield body is slidably guided and supported, and a rear body widening jack whose one end is attached to the rear half of the shield body allows the widened rear body to move forward and backward in the radial direction of the shield body. An erecta drum support is slidably attached to the sliding guide rod, and the erector drum support is made to be movable in the same direction as the rear body after widening by means of an erector movement jack attached to the rear half body of the shield body. A shield excavator that can freely expand the width of the excavation. (2) A widened front body is provided on a part of the front half of the shield body, and this widened front body has a cutter disk for widening extra digging that protrudes from the front so as to be close to the cutter disk of the shield body, and is integrated with this. An appropriate number of widening extra excavation means consisting of an attached earth removal screw conveyor and a drive motor that rotates them are arranged in an arc shape in a widening front body with a sealed box-like structure, and this widening front body is installed inside the shield body. The guide body is fitted into a guide body having a sealed box-shaped structure, and can be moved forward and backward in the radial direction of the shield body by means of a front body widening jack whose one end is attached to the front half body of the shield body. A widened rear body is provided on the circumference of the shield main body, and an advancing/retracting guide and a sliding guide rod for the erector drum support are provided upright on the inner surface of the widened body, and these are fixed to the rear half of the shield main body. The rear body is slidably guided and supported by a guide body, and the widened rear body can be moved back and forth in the same direction as the forward and backward direction of the widened front body by a rear body widening jack whose one end is attached to the rear body of the shield body, The erecta drum support is slidably attached to the guide rod, and the erector drum support can be moved in the same direction as the body after widening by means of an erector movement jack attached to the rear half body of the shield body. A shield excavator that can freely excavate special widths.