JPH086556B2 - Free section shield machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a free-section shield machine capable of continuously excavating a tunnel having a desired cross-sectional shape, not limited to a circular shape.

[Conventional technology]

Conventionally, various types of shield machines as described above have been proposed and implemented. Generally, a cutter placed on the front surface of the shield machine body is rotated around the central axis of the shield machine to excavate the front surface in the propulsion direction of the shield machine, and the shield machine is propelled by the excavated amount to make the segment ring. It is used by digging by adding.

Further, Japanese Patent Laid-Open No. 59-102090 discloses an enlarged shield construction method for forming an expanded diameter portion such as a retreat portion or a station portion in a part of a tunnel excavated by the shield machine.

[Problems to be Solved by the Invention]

Since the conventional shield construction method and shield machine excavate by rotating the front cutter, the excavation cross-sectional shape is limited to a circular shape, and it is difficult to excavate a tunnel having another irregular cross-sectional shape. On the other hand, most of the cross-sectional shapes actually required other than circular, such as sewers, power lines, and subway tunnels, are conventionally excavated with large circular cross-sections including such irregular cross-sectional shapes. In such a case, an extra excavation operation and an excavation shearing operation are required. Such extra work has a greater influence on the tunnel construction cost as the cross section of the subway tunnel has a larger diameter, which is also a constraint when applying the shield construction method.

In order to solve this problem, the invention disclosed in the above publication is constructed by excavating a tunnel with a normal diameter once to assemble a segment ring, then removing the segment ring of the target portion and performing special excavation work in the radial direction. The diameter portion and the like are partially formed, and the cross section having a desired shape other than the circular shape is not continuously excavated.

In view of such circumstances, an object of the present invention is to provide a shield machine capable of continuously excavating a tunnel having a desired sectional shape, not limited to a circular shape.

[Means for solving the problem]

The present invention relates to a shield machine body, a rotating body rotatably supported by the shield machine body around an axis extending in the propulsion direction, a main cutter fixed to the front surface of the rotating body, the main cutter, and the above A main cutter driving means for rotationally driving the rotating body, a slide member mounted on the rotating body so as to be slidable in a radial direction with respect to the rotating body, a sub-cutter rotatably mounted on the slide member, and the rotating body. A drive conversion mechanism provided on the body for converting the rotation of the rotating body into the rotation of the sub-cutter, and the sub-cutter revolving while excavating a desired excavation area around the excavation area of the main cutter while the main cutter is rotating. And an operation control means for controlling the slide operation of the slide member (claim 1).

The present invention also provides a shield machine main body, a rotating body rotatably supported by the shield machine main body around an axis extending in the propulsion direction, a main cutter fixed to the front surface of the rotating body, and the main cutter and Main cutter driving means for rotationally driving the rotating body, a slide member attached to the rotating body so as to be slidable in a radial direction with respect to the rotating body, a sub-cutter rotatably attached to the slide member, A sub-cutter driving means provided on the rotating body to drive each sub-cutter to rotate, and a slide member that revolves while the sub-cutter excavates a desired excavation region around the excavation region of the main cutter while the main cutter is rotating. An operation control means for controlling the slide operation is provided (Claim 2).

[Action]

According to the above configuration, the central portion of the face, which is the excavation front surface, is excavated by rotating the main cutter by the main cutter drive means. Further, during rotation of the main cutter, the slide member slides in the radial direction with respect to the main cutter under the control of the operation control means, so that the sub-cutter revolves in a unique trajectory and revolves. The outer peripheral portion of the face is excavated by the operation of the converting mechanism or the sub cutter is rotationally driven by the operation of the sub cutter rotational drive means according to claim 2.
Excavation with a desired cross-sectional shape is performed as a whole.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment (FIGS. 1 to 5) The shield machine shown in FIG. 1 and FIG. 2 is provided with a rectangular tube-shaped skin plate (shield machine body) 1, and a front end portion of the skin plate 1 ( In FIG. 2, a cutter casing (rotating body) 2 is provided at the left end portion.

On the front surface of the cutter casing 2, a main cutter (cutter arm) having a cross shape in a front view as shown in FIG.
3 is fixed. This main cutter 3 has multiple blades
3a is provided, and the respective tip portions of the main cutter 3 are connected by a cutter ring 6.

A plurality of sub-cutters 4 having a blade 4a on the front surface (a total of four in this embodiment) are provided at positions near the respective tip portions of the main cutter 3, and these sub-cutters 4 are provided with a slide member 5 therebetween. It is supported on the outer peripheral portion of the cutter casing 2. Further, each tip of the main cutter 3 is provided with a notch 3b for avoiding interference with the sub cutter 4.

As shown in FIG. 2, the rear end portion of the cutter casing 2 has a partition wall 1 a provided on the inner surface of the skin plate 1.
Supported by a large bearing 7. This large bearing 7
It supports a radial load, a thrust load, and a moment load, and the large bearing 7 rotatably supports the cutter casing 2 about a central axis (axis extending in the propulsion direction) G of the skin plate 1. . A ring gear 8 having internal teeth is fixed to the rear surface of the partition wall 1a.

In FIG. 2, only one sub cutter 4 is shown and the other sub cutters 4 are omitted. Further, in the figure, reference numeral 48 is a seal for preventing the earth and sand in the chamber 1b at the front part of the skin plate 1 from flowing backward.

Behind the cutter casing 2, a holding plate 40 is fixed to a bracket 1c provided on the inner wall surface of the skin plate 1, and a cutter driving motor (main cutter driving means) 41 is fixed to the holding plate 40. This cutter drive motor
A pinion 42 is fixed to the drive shaft of 41, and a large gear 43 is fixed to the rear end portion of the cutter casing 2, which mesh with each other. Therefore, the cutter casing 2 and the main cutter 3 are integrally rotated by the operation of the cutter driving motor 41.

FIG. 3 shows the internal structure of the cutter casing 2 and the slide member 5. First, the drive conversion mechanism C for converting the rotation of the cutter casing 2 into the rotation of the sub cutter 4 in this structure will be described.

The slide member 5 is a hollow slide pipe 9
And a hollow rod 10 in the slide pipe 9 has a double structure, and both are integrally fixed. The slide pipe 9 is supported by the cutter casing 2 via a slide bearing 11, and the slide member 5
Radial direction (first to third) with respect to the cutter casing 2 as a whole
It is movable in the direction of arrow A in the figure).

An intermediate rotating shaft 12 and a hollow rotating shaft 13 are rotatably housed in the hollow rod 10.

A base end portion (lower end portion in FIG. 3) of the intermediate rotary shaft 12 is connected to the hollow rotary shaft 13 by a spline 14 so as not to be relatively rotatable and slidable. The tip (upper end in FIG. 3) is a bearing 15 fixed to the cutter casing 2.
The bevel gear 16 is rotatably supported by and the bevel gear 16 is fixed to a portion inside the supporting portion.

On the other hand, a bearing 17 is fixed to the tip end of the cutter casing 2, and the rotating shaft 18 of the sub cutter 4 is fixed by the bearing 17.
Is rotatably supported, and a bevel gear 19 meshing with the bevel gear 16 is fixed to the rear end of the rotary shaft 18.

A bevel gear 20 is fixed to the base end of the hollow rotary shaft 13,
A portion further outside than this is rotatably supported by a bearing 21 fixed to the bracket 2a of the cutter casing 2.

On the other hand, in the cutter casing 2, a sub-cutter drive shaft 23 extending in the propelling direction of the shield machine is rotatably supported via a bearing 22, and the front end portion of the sub-cutter drive shaft 23 is engaged with the bevel gear 20. The bevel gear 24 is fixed. The rear end of the drive shaft 23 projects to the outside of the cutter casing 2, and a sub-cutter rotating pinion 25 as shown in FIG. 2 is fixed to the projecting end. It is meshed with the ring gear 8.

As described above, the ring gear 8 is the skin plate 1
Since it is fixed to the side, when the cutter casing 2 rotates, the sub-cutter rotation pinion 25 that meshes with the ring gear 8 rotates, and the rotation is sequentially performed. The sub-cutter drive shaft 23, the bevel gears 24, 20, and the hollow rotation. Shaft 13, Intermediate rotary shaft 1
2, and the rotating shaft of the sub cutter 4 via the bevel gears 16 and 19
The sub cutter 4 is transmitted to the rotary shaft 18 and is rotated integrally with the rotary shaft 18.

Next, in the structure shown in FIG. 3, means for sliding the slide member 5 in the radial direction will be described.

The base end portion of the hollow rod 10 of the slide member 5 is housed in a hydraulic cylinder 27 fixed to the cutter casing 2 by a pin 26. At the tip of this hydraulic cylinder 27,
A ridge 27a that projects inward is formed, and a ridge 10a that projects outward is formed at the tip of the hollow rod 10, and the pull-side hydraulic chamber 28 is formed between the ridges 10a and 27a. A push-side hydraulic chamber 29 is formed between the protrusion 10a and the bottom wall of the hydraulic cylinder 27. And the pulling side hydraulic chamber
By supplying pressure oil to the hydraulic pressure pipe 28 through the hydraulic pipe 30, the hollow rod 10 and the slide pipe 9 are integrally immersed in the cutter casing 2, and conversely, pressure is applied to the push side hydraulic chamber 29 via the hydraulic pipe 31. By supplying the oil, the hollow rod 10 and the slide pipe 9 integrally project from the cutter casing 2.

FIG. 4 shows an example of a hydraulic circuit for supplying pressure oil into the hydraulic chambers 28 and 29.

In the figure, 32 is a rotary joint also shown in FIG. 2, 33 is a servo valve, 34 is a tank, 35 is a hydraulic pump, 3
6,37 are switching solenoids. Here, when it is desired to hold the slide member 5 at a fixed position, the servo valve 33 is shifted to the position shown in the figure, the solenoid 36 is used when the slide member 5 is retracted, and the solenoid 36 is used when the slide member 5 is pushed out.
37 should be excited respectively.

Further, a drive control system (operation control means) as shown in FIG. 5 is provided inside the shield machine, and the drive control system controls the supply of the pressure oil. .

In the figure, the main cutter rotational position detector 90 indicates that the reference rotational position of the main cutter 3, that is, the reference rotational position of the cutter casing 2 is an appropriate position (for example, the position shown in FIG. 1).
The rotation displacement amount (for example, angle) of the main cutter 3 with respect to the reference rotation position is detected.

The hollow rod movement amount detector 94 appropriately determines the reference position of the hollow rod 10 in the slide member 5 and detects the actual expansion / contraction amount of the hollow rod 10 from this reference position, and is composed of a potentiometer or the like. There is. As the reference position, for example, the position of the hollow rod 10 when the sub cutter 4 is at the position shown in FIG. 1 may be set.

The arithmetic unit 91 has a built-in program for calculating the required movement amount of the hollow rod 10 with respect to the rotational displacement amount of the main cutter 3 for the purpose of obtaining a predetermined excavation cross section. The amount of movement of the hollow rod 10 required for the rotational displacement of the main cutter input from the main cutter rotational position detector 90 is instantly calculated. The details of the operation will be described later in detail.

The comparator 92 compares the movement amounts respectively input from the arithmetic unit 91 and the hollow rod movement amount detector 94, and issues a “projection” or “immersion” command to the hollow rod controller 93 so that the movement amounts become equal. It gives a stop command when the difference between the two is eliminated.

The hollow rod controller 93 controls the actual movement amount of the hollow rod 10. That is, the set of control devices included in the hydraulic circuit of FIG. 4 corresponds to the hollow rod controller 93.

In FIG. 2, reference numeral 45 is a screw conveyor for carrying the excavated soil in the chamber 1b rearward, and 46 is a shield jack for propelling the shield machine by taking a reaction force from the segments 47 sequentially laid on the inner wall of the tunnel.

 Next, the operation of this shield machine will be described.

First, by operating the cutter drive motor 41 in the skin plate 1, the pinion fixed to the drive shaft
42 and the large gear 43 rotate together, and the entire cutter casing 2 to which the large gear 43 is fixed rotates. With the rotation of the cutter casing 2, the front main cutter 3 rotates to excavate the central portion of the face, and the sub cutter 4 and the entire drive mechanism thereof revolve around the central axis G integrally.

Also, as described above, the ring gear 8 is the skin plate 1
Since the sub-cutter driving pinion 25, which is connected to the side and remains fixed during rotation of the cutter casing 2, rotates about the inner circumference of the ring gear 8 while revolving around the inner circumference of the ring gear 8. The rotation of the sub-cutter driving pinion 25 is transmitted to the rotary shaft 18 of each sub-cutter 4 by the mechanism described in FIG. 3, so that each sub-cutter 4 is rotationally driven at a predetermined rotational speed.

On the other hand, in the drive control system, first, the moving amount of the hollow rod 10 required to obtain the desired cross-sectional shape is calculated with respect to the rotational position of the main cutter 3 by the calculation device 91, and this moving amount and the actual moving amount are calculated. In comparison with the hollow rod 10, the movement command and the stop command for the hollow rod 10 are momentarily changed.
93, the sliding operation of the sub cutter 4 and the slide member 5 is controlled so that a desired excavation cross section can be obtained.

The details of the control will be described. For example, as shown in FIG. 1, when the sub-cutter 4 is at the position corresponding to the corner of the skin plate 1, the hollow rod 10 is projected from the cutter casing 2. , Distance from the central axis G to the sub-cutter 4 (that is, revolution radius)
To extend the excavation area by the sub cutter 4 to the corner portion. On the contrary, when the sub-cutter 4 is at the position corresponding to the midpoint of each side of the rectangular skin plate 1, the hollow rod 10 is retracted into the cutter casing 2,
The distance from the central axis G to the sub cutter 4 is shortened. By such control, the sub-cutter 4 revolves around a trajectory corresponding to a desired excavation shape (here, a substantially square shape).

Therefore, while the cutter casing 2 and the sub-cutter 4 are rotationally driven by the cutter driving motor 41, the entire shield machine is propelled by the operating force of the shield jack 47, so that the central circular portion is excavated by the main cutter 3 rotating in the center. At the same time, it is possible to excavate the outer peripheral portion by the sub-cutter 4 that revolves around its periphery while drawing a unique locus and rotates, and it is possible to excavate a tunnel having a desired cross-sectional shape as a whole.

The earth and sand excavated in this way can be removed from the skin plate 1
It is taken into the front chamber 1b and screw conveyor 45
After being unloaded to the ground by a belt conveyor or the like (not shown).

According to such a shield machine, the cutter casing 2
With the main cutter 3 fixed to and the sub cutters 4 arranged around the main cutter 3, a tunnel having a desired cross-sectional shape can be continuously and easily excavated.

Moreover, in this shield machine, since the sub-cutter 4 is slid directly in the radial direction, that is, the direction of the revolution radius, the revolution radius can be calculated easily, and the desired excavation shape can be obtained with simple control. Further, since both the rotary drive mechanism and the slide mechanism of the sub cutter 4 are housed in the single cutter casing 2, the screw conveyor
There is an advantage that the degree of freedom of arrangement of 45 etc. increases. Especially the chamber
Since the sediment in 1b is deposited in the lower part, the advantage that the sediment inlet of the screw conveyor 45 can be installed in the lower part as shown in FIG. 2 is great.

Further, in this shield machine, since both the cutter casing 2 and each sub-cutter 4 are driven by the cutter drive motor 41 which is a single drive source, the above effect can be obtained with a simple and low-cost structure. it can.

Further, in this shield machine, since the sub cutter 4 draws a desired revolution locus by controlling the rotational drive of the rotary member by the drive control system, the arithmetic unit 91
By simply converting the program installed in
Various excavation cross-sectional shapes can be easily obtained.

Further, by performing so-called overcut using such a function, a further excellent effect can be obtained. This overcut will be described with reference to FIG.

In the figure, areas J, K, L and M hatched outside the outer periphery 1'of the skin plate 1 are overcut zones. Normal excavation is controlled by a program installed in the arithmetic unit 91 so that the sub-cutter 4 moves along the outer peripheral shape of the skin plate 1, but here,
A program for moving the sub cutter 4 along the outer peripheral shape 96a obtained by adding the area J to the outer peripheral shape of the skin plate 1 in addition to the program for realizing the above movement in the arithmetic unit 91, and the outer peripheral shape including the area K A program for moving the sub cutter 4 along the outer peripheral shape 96c including the area L and the outer peripheral shape 96d including the area M is incorporated. At the same time, a selection circuit for arbitrarily selecting the above-mentioned five types of programs is added to the arithmetic unit 91 so that one of the five types of excavation cross sections can be arbitrarily selected as required. With this configuration,
The effect of overcut as described below can be obtained.

For example, when the normal excavation section program is selected and the excavation section program is switched to the excavation section program that matches the outer peripheral shape 96a, the skin plate 1
The part of the earth and sand protruding above the upper edge is also excavated (overcut). When excavation proceeds in this state, a sectional space corresponding to the region J above the skin plate 1 is formed, and the frictional resistance between the skin plate 1 and the earth and sand at this portion is reduced. On the other hand, since the lower part of the skin plate 1 is still in contact with the earth and sand, the difference between the frictional resistance of the upper part of the skin plate 1 and the frictional resistance of the lower part of the skin plate 1 gradually increases. As a result, the shield machine tries to escape to the upper side where the frictional resistance is small, and the propulsion direction of the shield machine gradually rises.

In this way, the shield machine tries to change the direction to the overcut direction, so the outer peripheral shapes 96a to 96d in FIG.
By appropriately selecting the excavation cross-section program corresponding to, it is possible to easily change the advancing direction of the shield machine up, down, left and right, and to excavate a sharp curve. If a program capable of overcutting each of the four corners is incorporated, it is possible to easily carry out the control of the posture recovery for rolling.

Second Embodiment (FIGS. 7 and 8) In the above embodiment, the sliding operation of the slide member 5 is controlled by hydraulic pressure. Here, however, a guide cam 50 is arranged in the cutter casing 2 and The cam 50 is used to identify the revolution trajectory of the sub cutter 4.

Specifically, in FIG. 7, in the central portion of the holding plate 40,
The rear end of a fixed shaft 51 extending in the propulsion direction of the shield machine is fixed, and the guide cam 50 is fixed to the front end of the fixed shaft 51. That is, the guide cam 50 is fixed to the skin plate 1 side. A bracket 52 is fixed to the inner wall of the cutter casing 2, and a bearing 53 fixed to the bracket 52 supports the front end of the fixed shaft 51. That is, during rotation of the cutter casing 2, the bearing 53 slides on the peripheral surface of the fixed shaft 51.

The guide cam 50 has opposite front and rear guide grooves 54 having U-shaped cross sections (left and right in FIG. 7). The front view shape of the guide groove 54, that is, the shape shown in FIG.
The shape is set to correspond to the desired excavation shape.

On the other hand, for the slide member 5, the slide pipe 9 and the hollow rod 10 as shown in the above-mentioned embodiment.
Instead of the double structure consisting of the above, a structure having a single structure slide pipe 9'is used. The slide pipe 9'is slidably supported on the cutter casing 2 side through a slide bearing 11, and a single intermediate rotary shaft 12 is rotatably supported by the slide pipe 9 '. The base end portion (lower end portion in FIG. 7) of the intermediate rotary shaft 12 is connected to the bevel gear 20 via a spline 57 so as not to be relatively rotatable and slidable.

A mounting bracket 55 is fixed to the base end portion of the intermediate rotating shaft 12, and rollers 56 are rotatably attached to the front and rear (left and right in FIG. 7) of the front end portion of the mounting bracket 55. They are fitted in the guide grooves 54, respectively.

According to such a shield machine, the cutter drive motor 41 is operated to drive the cutter casing 2 in the same manner as in the above-described embodiment, so that the roller 56 and the guide groove 54 are fitted and the slide member 5 and The sub cutter 4 revolves around. Therefore, by the guide of the guide groove 54, the slide member 5 and the sub cutter 4 revolve while drawing a locus corresponding to the shape of the guide groove 54, whereby a tunnel having a desired shape, that is, a shape corresponding to the shape of the cam 50 is formed. Excavated.

According to the apparatus of this embodiment, a desired excavation shape can be obtained only by providing the cam 50 of a specific shape without using a special control program or the like. Also in this embodiment, since the drive mechanism including the cam 50 is housed in the cutter casing 2, it is possible to save space in the shield machine.

Third Embodiment (FIG. 9) Here, a face plate-shaped cutter plate 60 is used as a main cutter instead of the arm-shaped main cutter 3 in the above-described embodiment. The cutter plate 60 is provided with a plurality of blades 60a, and a slit 61 for introducing the earth and sand in the front into the chamber 1b shown in the above-mentioned embodiment is provided at an appropriate position in the vicinity of the sub cutter 4. A notch 62 for avoiding interference with the cutter 4 is provided on the.

As shown in this embodiment, in the present invention, regardless of the specific shape of the main cutter, it may be appropriately set as needed.

Fourth Embodiment (FIG. 10) In the first and second embodiments, a single cutter drive motor 41 is used.
Although both the main cutter 3 and the sub cutter 4 are driven by this, in this embodiment, a sub cutter drive motor (sub cutter drive means) 70 different from the cutter drive motor 41 is provided, and this sub cutter drive motor 70 is used. The sub cutters 4 are driven separately from the main cutter 3.

In FIG. 10, at the rear end of the cutter casing 2,
A double gear 72 is rotatably supported via a bearing 71, and a front gear 72a of the double gear 72 is meshed with a sub-cutter driving pinion 25 also shown in the above embodiment. On the other hand, the sub-cutter drive motor 70 is fixed to the holding plate 40, and the pinion 73 fixed to its drive shaft is meshed with the rear gear 72b of the double gear 72.

According to such a shield machine, the cutter drive motor 41
By driving the sub-cutter drive motor 70 while the cutter casing 2 is being driven to rotate, the rotational force is transmitted to the double gear 72 so that the gear 72 rotates independently of the cutter casing 2, and the sub-cutter drive pinion is further driven. Transmitted to 25. Therefore, in this structure, the rotation speed of the sub cutter 4 can be determined separately from the rotation speed of the main cutter 3 by appropriately setting the rotation speed of the sub cutter drive motor 70 and the reduction ratio by the double gear 72.

Further, in the apparatus of this embodiment, since the sub cutter 4 can be driven in either forward or reverse directions, it is not necessary to be caught in the rotational direction of the sub cutter 4 when designing the drive transmission mechanism C and the like, and the work is easy. Becomes Further, by changing the rotation direction of the sub cutter 4,
It is also possible to remove stones caught between the outer peripheral portion of the skin plate 1 and the skin plate 1, and to correct rolling or the like during excavation.

Note that the present invention is not limited to such an embodiment, and the following embodiments can be taken as examples.

(1) In each of the above embodiments, the sub cutter 4 is arranged in front of the main cutter 3, but in the present invention, the sub cutter 4 may be arranged behind the main cutter 3. According to such a structure, first, the main cutter 3 excavates the earth and sand in the central part, and then the sub-cutter 4 excavates the peripheral part, so that the region excavated by the sub-cutter 4 is shown in each of the embodiments. Sub-cutter 4 is significantly reduced compared to the shield machine located in the front,
With this, the following effects can be obtained.

(A) Generally, since the outer radius of the sub cutter 4 is set smaller than the outer radius of the main cutter 3, the number of blades 4a attached to the sub cutter 4 is smaller than the number of blades 3a attached to the main cutter 3. The amount of work performed by one blade 4a is large. Therefore, if the burden on the sub-cutter 4 is heavy, the blade 4a of the sub-cutter 4 will be worn before the blade 3a of the main cutter 3. In this respect, as described above, in the shield machine in which the sub-cutter 4 is arranged at the rear, the excavation area is reduced, and since the earth and sand are loosened by the excavation by the main cutter 3, the load on the sub-cutter 4 is reduced, and the degree of wear of both cutters is reduced. Are averaged to extend the life of the entire shield machine.

(B) Since a complicated mechanism is required to drive the sub-cutter 4 as compared with the main cutter 3, by reducing the load on the sub-cutter 4, the driving mechanism is further simplified to reduce the cost and downsize the shield machine. Can be achieved.

(2) The excavation shape by the shield machine of the present invention is not limited to the rectangular shape as in the above embodiment, and a desired excavation shape such as a circle, an egg shape, a horseshoe shape, an elliptical shape, or the like can be obtained. Specifically, a rectangular shape is suitable for the common groove and the power cave, and a horseshoe shape is suitable for the road tunnel, which may be appropriately set according to the purpose of use.

FIG. 11 shows a small circle 10 which is an excavated cross-sectional shape obtained by rotating the outer periphery 1 ′ of the skin plate 1 and the main cutter 3.
0 (dashed-dotted line) and a large circle 101 (dashed-dashed line), which is the excavated cross-sectional shape obtained when the cutter casing 2 is rotated with the center of the small circle 100 passing through the center of the sub-cutter most In this device, the revolution path of the sub-cutter can be freely set within the range surrounded by the small circle 100 and the large circle 101. In either case, excavation can be performed well by exchanging the excavation section program of the arithmetic unit 91 and using a skin plate having a section shape corresponding to each excavation section shape. For example, the figure shows the outer periphery 1'of the skin plate 1 having a rectangular tube shape, but as is apparent from this figure, the outer periphery shape of the skin plate 1 is within the above range. .

Similarly, FIGS. 12 and 13 show examples in which horseshoe-shaped and oval-shaped outer peripheral shapes are accommodated within the above range. In these cases as well, the skin plate having the horseshoe-shaped or oval outer peripheral shape may be used, and a calculation program, a cam, or the like that allows the revolution trajectory of the sub-cutter to match these shapes may be provided.

(3) In the present invention, as shown in FIG. 14, for example, a plurality of skin plates 1 can be stacked and integrated so as to be connected. In this case, in addition to the dual connection shown in the figure,
It is possible to use 3 or 4 units. Further, as shown in FIG. 15, even if a single skin plate 1 is used and a plurality of excavation mechanisms are provided in this skin plate 1, the same effect as above can be obtained. .

(4) In the present invention, regardless of the number of sub-cutters and the arrangement position, the sub-cutters may be arranged at an appropriate place depending on the soil quality.

〔The invention's effect〕

As described above, according to the present invention, the main cutter and the rotating body are rotated, and the sub cutter is supported by the rotating body via the slide member, and the slide member is drawn so that the sub cutter draws a locus corresponding to a desired excavation shape. Since the main cutter is used to excavate the central circular portion of the face, and the sub cutter that draws a unique trajectory is used to excavate the outer peripheral portion, the tunnel having the desired cross-sectional shape as a whole. Can be freely drilled. Moreover, since the sub cutter is directly slid in the radial direction, that is, the direction of the revolution radius, it is easy to set the slide amount corresponding to the desired revolution radius of the sub cutter, and the above effect can be obtained with simple control. There is an effect that can be done.

Further, the shield machine according to claim 1 is provided with a drive conversion mechanism for converting the rotation of the rotating body into the rotation of the rotating shaft of the sub-cutter, so that both the main cutter and the sub-cutter can be driven by the same drive means. Therefore, there is an effect that the structure can be simplified and the cost can be reduced.

Further, in the shield machine according to the second aspect, since the driving means for the main cutter and the driving means for the sub-cutter are separately provided, the rotation direction and the rotation speed of both cutters can be set independently of each other. There is an effect that the number of rotations suitable for can be freely set.

[Brief description of drawings]

1 is a front view of a shield machine according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a sectional view showing a drive structure of a sub-cutter in the shield machine.
FIG. 4 is a circuit diagram of a hydraulic circuit provided in the shield machine,
FIG. 5 is a block diagram showing a drive control system provided in the shield machine, FIG. 6 is a front view showing an overcut area by the shield machine, and FIG. 7 is a main part of the shield machine in the second embodiment. FIG. 8 is a cross-sectional view showing VIII-VI in FIG.
II sectional view, FIG. 9 is a front view of the shield machine in the third embodiment, FIG. 10 is a cross-sectional view showing the drive structure of the sub-cutter of the shield machine in the fourth embodiment, and FIG. 11 is the revolution trajectory of the sub-cutter and Explanatory drawing showing the setting range of the outer peripheral shape of the skin plate, FIGS. 12 and 13 are explanatory views showing another example of the outer peripheral shape of the skin plate, and FIG. 14 is an explanatory view showing a state in which a plurality of skin plates are connected in series. FIG. 15 and FIG. 15 are explanatory views showing a single skin plate equipped with a plurality of excavation mechanisms. DESCRIPTION OF SYMBOLS 1 ... Skin plate (shielding machine main body), 2 ... Cutter casing (rotating body), 3 ... Main cutter, 4 ... Sub cutter, 5 ... Sliding member, 41 ... Cutter drive motor (rotating body drive means), 50 ... Guide cam ( Configuring operation control means),
60 ... Cutter plate (main cutter), 70 ... Sub-cutter drive motor (Sub-cutter drive means), 90 ... Cutting wheel rotation position detector (constitutes operation control means), 91 ...
Computational device (constitutes operation control means), 92 ... Comparator (constitutes operation control means), 93 ... Expansion / contraction member controller (composition of operation control means system), 94 ... Expansion / contraction member expansion amount detector (operation control means) Structure), C ... Drive conversion mechanism, G ... Central axis (axis extending in the propulsion direction)

(72) Inventor Toshinori Asahi, 3-5-25 Himejima, Nishiyodogawa-ku, Osaka City, Osaka Prefecture Okumura Kikai Seisakusho Co., Ltd. (72) Inventor Mamoru Takemura 3-1-812 Takahama-cho, Ashiya City, Hyogo Prefecture

Claims (2)

[Claims] 1. A shield machine main body, a rotating body rotatably supported by the shield machine main body around an axis extending in the propulsion direction, a main cutter fixed to the front surface of the rotating body, and the main cutter and Main cutter driving means for rotationally driving the rotating body, a slide member attached to the rotating body so as to be slidable in a radial direction with respect to the rotating body, a sub-cutter rotatably attached to the slide member, A drive conversion mechanism provided on the rotating body for converting the rotation of the rotating body into the rotation of the sub cutter, and the sub cutter excavating a desired excavation area around the excavation area of the main cutter while the main cutter is rotating. A free-section shield machine, comprising: an operation control means for controlling a slide operation of a slide member so as to revolve. 2. A shield machine main body, a rotary body rotatably supported by the shield machine main body around an axis extending in the propulsion direction, a main cutter fixed to the front surface of the rotary body, the main cutter, and Main cutter driving means for rotationally driving the rotating body, a slide member attached to the rotating body so as to be slidable in a radial direction with respect to the rotating body, a sub-cutter rotatably attached to the slide member, A sub-cutter driving means provided on the rotating body to drive each sub-cutter to rotate, and a slide member that revolves while the sub-cutter excavates a desired excavation region around the excavation region of the main cutter while the main cutter is rotating. A free-section shield machine comprising: an operation control means for controlling a slide operation.