JPH09177484A - Cutter head of small-bore pipe propelling machine and its propelling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate excavation that has high directional accuracies by arranging disk cutters and sediment-drawing openings on a cutter-head surface plate where they are in point symmetry with respect to the rotation center of a cutter head. SOLUTION: Three inner-peripheral disk cutters 11a having their autorotation axes are mounted on a diameter 10a on a cutter-head surface plate 9a and in different span positions as measured from the rotation center Oa of a cutter head 5a, and two gauge cutters 12a are mounted. Cutter bits 13a are mounted on both sides of each inner-peripheral disk cutter 11a. Two gauge disk cutters 8a are mounted on a diameter 14a on the cutter head surface plate 9a in such a way as to be capable of performing autorotation. Further, sediment-drawing openings 16a are placed on the cutter head surface plate 9a and in point symmetry with respect to the rotation center Oa of the cutter head 5a. Thus excavation having high directional accuracies can be performed whether a small-bore pipe propelling machine is rotated in the normal or reverse direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter head for a small-diameter pipe propulsion machine and a propulsion method thereof, and more particularly to a cutter for a small-diameter pipe propulsion machine in which the opening ratio of the cutter head is adjusted according to the soil content of excavation. The present invention relates to a head and a method of driving the head.

[0002]

2. Description of the Related Art The ratio of the total area of openings to the excavation area is called the opening rate, and this opening rate must be changed according to the soil quality of the excavation. That is, in general, when excavating soil is highly adherent cohesive soil, the opening ratio is increased to prevent clogging, and in the case of highly collapsible ground, the opening ratio is reduced to prevent excessive uptake. There is a need. Also rocks,
In the gravel layer, since the excavation shear diameter that can be conveyed by the soil discharging device (screw conveyor, etc.) is limited, the opening width (aperture ratio) is made small so that the excavation shear diameter taken from the opening does not exceed it. To do. In the conventional small-diameter tube propulsion machine, when changing the aperture ratio, it was necessary to remove the disk cutter on the cutter head or replace the cutter head. However, as a first conventional technique, FIG.
In a shield machine as shown in (Japanese Utility Model Publication No. 61-17112), the opening ratio of the cutter head is controlled by a removable face plate.

The operation of the first conventional technique will be described with reference to FIG. Mount the Yamadome face plate as follows. First, the outer diameter side plate 57 is attached, and then the inner diameter side plate 5
6, the liner 58 is interposed between the opposite end surfaces of the double-sided plates 56 and 57, and the three members are connected by bolts 59 and nuts 60 to fix the entire face plate in the radial direction. Then, the shear piece 61 fixes the entire face plate in the circumferential direction. On the contrary, when removing the mountain retaining face plate, the nut 6
After removing the bolts 59 and 0, the liner 58 is slightly lifted up, the liner 58 is removed, the inner diameter side plate 56 is dropped onto the end face of the outer diameter side plate 57, and the radial fixing is released. Then, the inner diameter side plate 56 and the outer diameter side plate 57 are removed in this order toward the front side.

Further, in the second conventional technique shown in FIG. 10,
Each spoke 7 installed at the diameter position of the cutter head 70
A disk cutter 72 and a cutter bit 73 are mounted on the disk 1, and an opening 74 for excavating earth and sand is arranged between these spokes 71.

[0005]

However, according to the first conventional technique shown in FIG. 9, since the inner diameter side plate 116 and the outer diameter side plate 117 can only be attached or detached at the same time, the cutter head according to the soil quality can be used. It was difficult to finely adjust the aperture ratio.

In the second conventional technique shown in FIG. 10,
Since the opening ratio of the earth and sand intake openings 74 arranged between the spokes 71 cannot be adjusted, it is difficult to adjust the opening ratio according to the soil quality.

As described above, the conventional techniques have the following problems in terms of aperture ratio and attachment / detachment of the gauge cutter. 1. Opening rate Since a small-diameter propulsion machine repeatedly uses one machine, it is necessary to select the optimal opening rate for multiple types of soil in order to prevent the ground from collapsing and to secure excavation speed. Nevertheless, in the conventional small-diameter pipe propulsion machine, it was difficult to excavate at the optimum aperture ratio for each excavated soil because the adjustment range of the aperture ratio was small or impossible. On the other hand, in order to obtain the optimum gauge cutter arrangement for each excavated soil quality, it is necessary to replace the cutter head, and it takes time and effort to replace the cutter head, which causes a problem such as a large cost burden on the user.

[0008] 2. Desorption of gauge cutter When excavating rocks and gravel layers, if the amount of overcut is small or insufficient, the excavation resistance will increase.Therefore, it is necessary to surely overcut the outer periphery, and attach a large number of gauge cutters to the outer periphery. And good. However, when a soft layer is excavated by such a cutter head, not only is a gauge cutter unnecessary, but also the outer peripheral ground is disturbed more than necessary, causing collapse around the excavated portion and ground subsidence. On the other hand, when trying to obtain the optimum gauge cutter layout according to the geology, there is a problem that the attachment and detachment of the gauge cutter is troublesome.

The present invention has been made to solve the problems in the above-mentioned respective prior arts, and improves the excavation efficiency by easily changing the optimum aperture ratio for a plurality of types of excavated soil with a single cutter head. It is an object of the present invention to provide a small-diameter pipe propulsion device and a propulsion method therefor.

[0010]

In order to achieve the above-mentioned object, the cutter head of the small-diameter propulsion machine according to the first aspect of the present invention has each rotating shaft for rotation on a predetermined diameter of the cutter head face plate. In a cutter head of a small-diameter pipe propulsion machine equipped with a disc cutter, if there is no disc cutter other than the above, an opening for earth and sand intake is provided, and if a disc cutter other than the above is provided, this disc cutter and the earth and sand remover are used. The insertion opening is arranged on the cutter head face plate that is point-symmetric with respect to the center of rotation of the cutter head.

As disc cutters having a diameter other than a predetermined diameter, for example, a gauge disc cutter and a gauge cutter bit can be arranged on different diameters of the cutter head at symmetrical positions with respect to the center of rotation. Therefore, the excavation reaction force acting on the cutter head does not become unbalanced, and the meandering of the body of the small diameter pipe propulsion machine can be prevented. Therefore, it is possible to excavate with high directional accuracy in both forward and reverse rotations of the small diameter tube propulsion machine. It is possible to arrange the earth and sand intake openings between each disk cutter row, and the crushed pieces that are crushed by the disk cutters can be taken into the cutter head through the earth and sand intake openings immediately after crushing. Secondary crushing can be prevented. In addition, excavation performance in both forward and reverse rotation, it is possible to equalize the sediment uptake performance, and since it is possible to make the soil uptake performance in each part on the face plate almost equal, the face is partially over-consolidated,
It is not overloaded. Therefore, the uptake speed of the earth and sand is improved because the soil uptake is improved as a whole.

In the cutter head of the small-diameter propulsion machine according to the second aspect of the invention, the disk cutters arranged other than on the predetermined diameter are gauge disk cutters, and the gauge disk cutter is a cutter orthogonal to the predetermined diameter. It may be located on the diameter of the head.

Since the gauge disk cutter as a disk cutter having a diameter other than the predetermined diameter is arranged on a face plate which is line-symmetric with respect to the diameter of the cutter head orthogonal to the predetermined diameter, the cutter head is provided. It is possible to prevent the meandering of the body of the small diameter pipe propulsion machine without causing imbalance in the excavation reaction force that acts on. Therefore, it is possible to excavate with high accuracy in a small-diameter pipe propulsion machine.

In the cutter head of the small diameter pipe propulsion device according to the third aspect of the present invention, a removable face plate may be attached to the earth and sand intake opening.

Since the shape of the earth and sand intake opening is the same, the face plate to be attached thereto can be made common, and the earth and sand intake opening can be adjusted to an optimum size according to the excavated soil quality. Therefore, a wide range of soil properties can be dealt with without removing and replacing the disc cutter on the cutter head, and thus the propulsion efficiency of the small-diameter pipe propulsion device can be greatly improved.

In the cutter head of the small diameter propulsion machine according to the fourth aspect of the invention, the removable face plate may be one type or a plurality of types of face plates having different areas.

The opening other than the disk cutter and gauge cutter of the cutter head face plate is opened to secure an opening for earth and sand intake, and one or more kinds of detachable face plates having different areas are provided in the opening for earth and sand intake. Prepare and prepare a face plate with an appropriate area to fit the excavated soil, and adjust the aperture ratio by attaching it. Therefore, it is possible to increase the aperture ratio without removing the disc cutter on the cutter head, and by closing the aperture with a removable face plate, the adjustment range of the aperture ratio becomes large and a wide range of soil properties can be obtained. Can handle. That is, it is possible to obtain the optimum aperture ratio for a plurality of types of soil with a single cutter head. Generally, in rocks and gravel layers where the opening width (aperture ratio) should be limited by the face plate, if the amount of overcut on the outer periphery is insufficient, it will lead to an increase in the excavation resistance, so reliable overcut of the outer periphery is necessary. It is better to increase the number of gauge cutters. On the other hand, in soft cohesive soil where the surface plate should be removed to increase the opening ratio, if the amount of overcut is large, it will disturb the outer ground and cause collapse around the excavation part or ground subsidence, so there is less gauge cutter on the outer periphery. You may Further, it is convenient if the number of gauge cutters can be adjusted at the same time along with the change of the aperture ratio.

In the cutter head of the small diameter tube propulsion machine according to the fifth aspect of the present invention, the removable face plate can be made into a flywheel by adjusting the weight. The small-diameter pipe propulsion machine is lightweight and has a small rotational inertia.It may stall when excavating rocks, gravel, or other strong ground.Therefore, adjusting the face plate weight to increase the rotational inertia due to the flywheel effect. Stalls can be prevented. This structure is rational because it is common to limit the opening of the small-diameter propulsion unit for sand and sand when excavating rocks or gravel or other solid rock that is prone to stall. .

A cutter head of a small diameter tube propulsion machine according to a sixth aspect of the present invention is a small diameter tube propulsion machine provided with a disk cutter having a rotating shaft for each rotation on a predetermined diameter of a cutter head face plate of the small diameter tube propulsion machine. In the cutter head of the machine, in addition to the mounting opening of the disk cutter, an opening for earth and sand intake is installed on the cutter head face plate, and a part of the opening for earth and sand intake is closed, and for the outer peripheral gauging. It is characterized by having a removable face plate on which a chip is installed.

In addition to the mounting opening of the disc cutter, by installing a peripheral gauging tip on a removable face plate that closes a part of the earth and sand intake opening installed on the cutter head face plate, The rate and the number of gauge cutters can be adjusted simultaneously according to the excavated soil quality. That is, by removing the face plate in the soft layer, the aperture ratio can be increased and at the same time the gauge cutter number can be reduced, and in the rock and gravel layer, the face plate can be attached to reduce the aperture ratio and simultaneously increase the gauge cutter number. Therefore, in rocks and gravel layers where the opening width (opening ratio) should be limited by the face plate, by increasing the number of gauge cutters on the outer periphery, a reliable overcut amount on the outer periphery can be obtained, so that an increase in excavation resistance can be prevented. . On the other hand, in soft cohesive soil where the face plate should be removed to increase the opening ratio, if the number of gauge cutters on the outer circumference is reduced and the overcut amount is limited, the outer ground is not disturbed and collapse around the excavation area or the ground Can prevent subsidence.

A propulsion method for a small-diameter pipe propulsion device according to a seventh aspect of the present invention is the propulsion method for a small-diameter pipe propulsion device using a cutter head of the small-diameter pipe propulsion device according to the third invention, wherein the detachable device is removable. It is characterized in that the opening ratio is adjusted according to the soil quality by exchanging one or more kinds of face plates having different areas.

In addition to the disc cutter mounting opening, a removable face plate installed on the cutter head face plate for closing a part of the earth and sand intake opening allows the optimum opening size according to the excavation soil quality. Can be adjusted. Therefore, without removing the disc cutter on the cutter head, by closing the earth and sand intake opening installed on the cutter head face plate with a removable face plate as appropriate, the adjustment range of the opening ratio becomes large and a wide range of soil quality is achieved. Can handle. That is, since a single cutter head can obtain an optimum opening ratio for a plurality of types of soils, the propulsion work efficiency of the small diameter pipe propulsion machine can be significantly improved.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a cutter head for a small diameter pipe propulsion device and a propulsion method thereof according to the present invention will be described in detail below with reference to FIGS. FIG. 1 is a vertical sectional view of a small-diameter pipe propulsion machine equipped with a cutter head for a small-diameter pipe propulsion machine according to the present invention, and FIG. 2 shows a first embodiment of a cutter head of the small-diameter pipe propulsion machine according to the present invention. 3 is a front view showing a second embodiment of a cutter head of a small diameter pipe propulsion machine according to the present invention, and FIG. 4 is a view showing a face plate with an auxiliary gauge cutter for outer circumference gauging of a small diameter tunnel in FIG. , (A) is a side view, (B) is a plan view, FIG. 5 is a front view showing a third embodiment of a cutter head of a small diameter pipe propulsion device according to the present invention, and FIG. 6 is a small diameter pipe according to the present invention. Front view showing a cutter head of a propulsion machine according to a fourth embodiment, FIG. 7 is a front view showing a cutter head of a propulsion machine according to a fifth embodiment of the present invention, and FIG. 8 is a small diameter tube according to the present invention. It is a front view which shows the 6th Example of the cutter head of a propulsion machine.

The structure of the small diameter propulsion machine 1 will be described with reference to FIG. A front tip conduit 4 is articulately connected to a front portion of the rear tip conduit 2 by a bent portion 3,
A cutter head 5 is rotatably attached to the front end of the front tip conduit 4 by a cutter head drive motor 6. A gauge disk cutter 6 is attached to the cutter head 5 so as to rotate. Further, a screw conveyor 7 that conveys the earth and sand excavated by the cutter head 5 to the rear of the small-diameter propulsion machine is attached to the central portions of the rear front conduit 2 and the front front conduit 4. The screw conveyor 7 is composed of a screw pipe 7a fixed to the rear front conduit 2 and the front front conduit 4, and a screw 7b rotating in the screw pipe 7a.

The operation of FIG. 1 will be described. The cutter head 5 attached to the front end of the front tip conduit 4 is
At the same time as being driven to rotate by the cutter head drive motor 6 attached to, the propulsive force is applied from the rear tip conduit 2 via a swing jack (not shown). Therefore, the disc cutter 8 mounted on the cutter head 5 so as to be rotatable
The ground ahead is excavated by the above. The excavated earth and sand excavated by the cutter head 5 is conveyed to the rear of the small diameter pipe propelling machine 1 by a screw conveyor 7 fixed to the rear front conduit 2 and the front front conduit 4. In addition, the rear tip conduit 2 and the front tip conduit 4 connected to the front portion thereof are articulately connected by a bent portion 3 so that the excavation direction can be controlled.

FIG. 2 is a diagram showing a first embodiment of the present invention.
It is a front view of the cutter head 5a for excavating cohesive soil of a small diameter pipe propulsion machine. A predetermined first diameter 1 of the cutter head face plate 9a
Three inner peripheral disk cutters 11a each having a rotation shaft for rotation thereof are mounted on 0a at different span positions from the rotation center Oa of the cutter head 5a, and two gauge cutters 12a are mounted on the disk 0a. Further, cutter bits 13a are mounted on both sides of the inner peripheral disk cutter 11a. Further, on the second diameter 14a orthogonal to the first diameter 10a on the cutter head face plate 9a, two gauge disc cutters 8a can rotate as disc cutters other than the three inner peripheral disc cutters 11a. It is installed. Also, on the cutter head face plate 9a,
In addition to the mounting openings 15a for the inner peripheral disk cutter 11a and the gauge disk cutter 8a, a dirt and sand intake opening 16a is arranged at a position symmetrical with respect to the rotation center Oa of the cutter head 5a.

The operation of FIG. 2 will be described. Even if the cutter head 5a rotates in either the left or right direction,
The gravel and rocks contained in cohesive soil are the inner disk cutter 1
1a and gauge disc cutter 8 on the outer periphery of the tunnel
The ground that is crushed by a and is relatively soft is excavated by the cutter bit 13a and the gauge cutter 12a. The inner peripheral disk cutter 11a, which has a relatively small moment to the center of the cutter head due to the excavation reaction force applied to the cutting edge, is installed at a span position different from the rotation center Oa of the cutter head 5a. Since the gauge disk cutter 8a having a large moment with respect to the center of the head is arranged point-symmetrically with respect to the rotation center Oa of the cutter head 5a, there is no imbalance due to the excavation reaction force acting on the cutter head 5a, and small-diameter propulsion is performed. The meandering of the machine body can be prevented.

Further, in the space between the cutter bit 13a on the cutter head face plate 9a and the gauge disc cutter 8a, there are four earth and sand intake openings 16a at positions symmetrical with respect to the rotation center Oa of the cutter head 5a. Since it is arranged, excavation performance and sediment intake performance in both forward and reverse rotation can be made equal, and the sediment intake performance at each part on the face plate can be made almost equal, so the cutting face is partially overloaded. It is not compacted or overloaded. Therefore, since the cutter head 5a as a whole is improved in the ability to take in earth and sand, the excavation speed is improved.

Furthermore, the scraps crushed by the disk cutters 8a, 11a can be taken into the cutter head 5a through the earth and sand intake opening immediately after the crushing, and the disk cutter 8
Since the secondary crushing of misalignment due to a and 11a is prevented, the rotation of the cutter head 5a is stabilized, and the wear speed of the disk cutters 8a and 11a can be suppressed. Therefore, it is possible to excavate a small-diameter tunnel with high directional accuracy in both forward and reverse rotations of the small-diameter pipe propulsion machine. Since the present embodiment is the cutter head 5a for excavating cohesive soil, the opening ratio is maximized without attaching face plates for adjusting the opening ratio to the four soil intake openings 16a, so that the soil intake can be improved. The excavation speed is improved by preventing the excavation soil from being blocked at the opening 16a. In the soft cohesive soil where the opening ratio should be increased without attaching the face plate as described above, the gauge cutter 1 on the outer circumference is used.
If the number of 2a is reduced and the amount of overcut is limited, the surrounding ground is not disturbed, and therefore collapse around the excavation portion and ground subsidence can be prevented.

FIG. 3 is a diagram showing a second embodiment of the present invention.
FIG. 3 is a front view of a rock head / gravel layer excavating cutter head 5b of a small diameter pipe propulsion device. Similar to FIG. 2, on the predetermined first diameter 10b of the cutter head face plate 9b, there are provided an inner peripheral disc cutter 11b as a plurality of disc cutters each having a rotation shaft for its rotation, and a gauge cutter 12b. Cutter bits 13b are mounted on both sides of the inner peripheral disc cutter 11b. The first diameter 10b
The cutter head face plate 9 which is point-symmetric with respect to the rotation center Ob of the cutter head 5b on the second diameter 14b orthogonal to
Two gauge disc cutters 8b, other than the inner peripheral disc cutter 11b, are rotatably mounted on b. Further, on the cutter head face plate 9b, in addition to the mounting openings 15b for the inner peripheral disc cutter 11b and the gauge disc cutter 8b, four earth and sand are placed at positions symmetrical about the rotation center Ob of the cutter head 5b. The intake opening 16b is arranged. A face plate 17b for adjusting the opening area is detachably attached to the earth and sand intake opening 16b.
An auxiliary gauge cutter 18b for small-diameter tunnel outer peripheral gauging is fixed to the outer peripheral portion of 7b.

The operation of FIG. 3 will be described. The second embodiment shown in FIG. 3 is a rock head / gravel layer excavating cutter head 5b of a small diameter pipe propulsion machine, but is basically the same as the cutter head 5a of the first embodiment shown in FIG. Only different parts will be described. On the cutter head face plate 9b, the earth and sand intake opening 16b arranged at a position point-symmetric with respect to the rotation center Ob of the cutter head 5b,
The opening ratio is limited by the face plate 17b that is detachably attached to prevent the intake of a large rock mass that causes the collapse of the ground and the blockage of the screw conveyor due to the excessive intake of excavated earth and sand. In this way, the opening ratio can be adjusted without removing the inner peripheral disk cutter 11b and the gauge disk cutter 8b on the cutter head 5b or replacing the cutter head, and it is possible to cope with a wide range of soil properties. The propulsion efficiency of the machine 1 can be greatly improved.

In rocks and gravel layers, if the amount of overcut on the outer periphery of the tunnel is insufficient, it leads to an increase in excavation resistance. Therefore, reliable overcut on the outer periphery is required, and it is necessary to increase the number of gauge cutters on the outer periphery. Therefore, an auxiliary gauge cutter 18b for tunnel outer circumference gauging is fixed to the outer peripheral portion of the face plate 17b as shown in detail in FIG. The removable face plate 1 that closes a part of the earth and sand intake opening 16b installed on the cutter head face plate 9b in this way
7b, auxiliary gauge cutter 18b for outer circumference gauging
By installing, the opening ratio and the number of gauge cutters can be adjusted simultaneously according to the excavated soil quality. That is, by removing the face plate in the soft layer, the aperture ratio can be increased and at the same time the gauge cutter number can be reduced, and in the rock and gravel layer, the face plate can be attached to reduce the aperture ratio and simultaneously increase the gauge cutter number.

Further, the small diameter pipe propulsion device 1 is light in weight, has a small rotational inertia, and may stall at the time of excavation of strong rocks or gravel. Therefore, the weight of the face plate 16b is adjusted to achieve the flywheel effect. Stalls can be prevented by increasing the rotational inertia. Further, when excavating a solid ground such as rock or gravel, the stall of the small diameter pipe propulsion device 1 is prevented by limiting the opening ratio of the earth and sand intake opening 16b of the small diameter propulsion device 1.

FIG. 4 is a view showing details of the face plate with the auxiliary gauge cutter in FIG. 3, (A) being a side view and (B) being a plan view. In the figure, a face plate 17b is formed with a mounting hole 19b for the cutter head 5b, and an auxiliary gauge cutter 18b for outer circumference gauging of a small diameter tunnel is fixed to the outer peripheral portion of the face plate 17b.

The operation of FIG. 4 will be described. 3 on the periphery
The face plate 17b to which each auxiliary gauge cutter 18b is fixed is
It is attached to the cutter head 5b by the attachment hole 19b.

FIG. 5 is a diagram showing a third embodiment of the present invention.
It is a front view of the cutter head 5c which has a large opening without a gauge disk cutter in an outer peripheral part. Similar to FIG. 2, on the predetermined first diameter 10c of the cutter head face plate 9c, three inner peripheral disc cutters 11c as a plurality of disc cutters each having a rotation shaft for its rotation, and two others. Is equipped with a gauge cutter 12c, and cutter bits 13c are mounted on both sides of the inner peripheral disk cutter 11c. In addition to the mounting opening 15c of the inner peripheral disk cutter 11c, the rotation center Oc of the cutter head 5c is also included.
2 on the cutter head face plate 9c which is point-symmetrical with respect to
The individual earth and sand intake openings 16c are arranged. A face plate 17c for adjusting the opening area is detachably attached to the earth and sand intake opening 16c. Note that, unlike FIG. 2, without mounting a gauge disc cutter on the second diameter 14c orthogonal to the first diameter 10c,
The opening area of the earth and sand intake opening 16c can be increased.

The operation of FIG. 5 will be described. By omitting the two gauge disc cutters 8a as shown in FIG. 2, the opening area of the earth and sand intake opening 16c is made large, and the opening area is adjusted by the size of the face plate 17c so as to cover a wide range. Applicable to excavated soil.

FIG. 6 is a diagram showing a fourth embodiment of the present invention.
FIG. 6 is a front view of a cutter head 5d in which all cutters including a disk cutter of a small-diameter pipe propulsion device and earth and sand intake openings are arranged point-symmetrically with respect to the center of rotation of the cutter head.
Similar to FIG. 3, the cutter head face plate 9d, the first diameter 10
d, inner peripheral disk cutter 11d, cutter bit 13
d, second diameter 14d, rotation center O of cutter head 5d
d, cutter head face plate 9d, gauge disc cutter 8
Since the d, the attachment opening 15d, the earth and sand intake opening 16d, and the face plate 17d are the same as those in FIG. 3, the description thereof will be omitted. 3 differs from FIG. 3 in that the inner peripheral disk cutter 11d is mounted point-symmetrically with respect to the rotation center Od of the cutter head 5d, and the gauge cutter 12b and the auxiliary gauge cutter 18b are omitted. That is.

The operation of FIG. 6 will be described. In the cutter head 5d, both the inner peripheral disk cutter 11d and the gauge disk cutter 8d having a high rotation speed are arranged point-symmetrically with respect to the rotation center Od of the cutter head 5d. The action and effect of preventing the meandering of the body of the small-diameter pipe propulsion machine are remarkable without causing imbalance in the reaction force.

FIG. 7 is a view showing a fifth embodiment of the present invention, and is a front view of a cutter head 5e in which the opening ratio of the opening for dirt and sand intake of the cutter head is larger than that of the second embodiment shown in FIG. Is. Cutter head face plate 9e first diameter 10e,
Inner peripheral disc cutter 11e, gauge cutter 12e cutter bit 13e, second diameter 14e cutter head 5
e Rotation Center Oe Cutter Head Face Plate 9e Gauge Disc Cutter 8b, Mounting Opening 15e, Sediment Intake Opening 1
Since 6e and the face plate 17e are the same as those in FIG. 3, description thereof will be omitted. The part different from FIG. 3 is the face plate 17e.
The auxiliary gauge cutter was omitted from.

The operation of FIG. 7 will be described. In the cutter head 5b of the second embodiment shown in FIG. 3, reliable overcut of the outer peripheral part is not necessary in the ground of cohesive soil, not the ground of rock or gravel layer, and it is necessary to increase the number of gauge cutters on the outer periphery. Therefore, the auxiliary gauge cutter for tunnel outer circumference gauging is omitted in the outer peripheral portion of the face plate 17e, and the face plate 17e is made small so that the sand intake opening 16e is formed.
The opening is large.

FIG. 8 is a diagram showing a sixth embodiment of the present invention.
Cutter head 5 equipped with a pair of outer peripheral disk cutters 20 arranged symmetrically with respect to the center of rotation of the cutter head
It is a front view of f. Cutter head face plate 9f First diameter 10f, Inner peripheral disc cutter 11f, Gauge cutter 1
The 2f cutter bit 13f, the second diameter 14f the cutter head 5f rotation center Of, the cutter head face plate 9f mounting opening 15f, the earth and sand intake opening 16f, and the face plate 17f are the same as in FIG. . FIG.
The part different from is the second diameter 1 of the cutter head face plate 9f.
A pair of outer peripheral disc cutters 20 and a pair of gauge disc cutters 8f are mounted point-symmetrically with respect to the rotation center Of of the cutter head 5f on two diameters that are line-symmetric with respect to 4f.

The operation of FIG. 8 will be described. A pair of outer peripheral disc cutters 20 and gauge disc cutters 8f are mounted point-symmetrically with respect to the rotation center Of of the cutter head 5f on two diameters that are line-symmetrical to the second diameter 14f of the cutter head face plate 9f. Since the excavation reaction force acting on the cutter head is not imbalanced, the effect of preventing the meandering of the airframe of the small diameter pipe propulsion machine is remarkable.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a small diameter pipe propulsion machine equipped with a cutter head of the small diameter pipe propulsion device according to the present invention.

FIG. 2 is a front view showing a first embodiment of a cutter head of a small diameter tube propulsion machine according to the present invention.

FIG. 3 is a front view showing a second embodiment of the cutter head of the small diameter tube propulsion machine according to the present invention.

4A and 4B are views showing a face plate with an auxiliary gauge cutter for outer circumference gauging of a small diameter tunnel in FIG. 3, in which FIG. 4A is a side view and FIG. 4B is a plan view.

FIG. 5 is a front view showing a third embodiment of the cutter head of the small diameter tube propulsion machine according to the present invention.

FIG. 6 is a front view showing a fourth embodiment of the cutter head of the small diameter tube propulsion machine according to the present invention.

FIG. 7 is a front view showing a fifth embodiment of the cutter head of the small diameter tube propulsion machine according to the present invention.

FIG. 8 is a front view showing a sixth embodiment of the cutter head of the small diameter tube propulsion machine according to the present invention.

9A and 9B are views showing a first conventional technique, in which FIG. 9A is a front view of a cutter head, and FIG. 9B is a cross-sectional view taken along line BB of FIG.
(C) is a detailed view of the inner diameter side plate.

FIG. 10 is a front view of a second prior art cutter head.

[Explanation of symbols]

 1 Small Diameter Pipe Propulsion Machine 2 Rear Tip Conduit 3 Bent Section 4 Front Tip Conduit 5, 5a-5f Cutter Head 6 Cutter Head Drive Motor 7 Screw Conveyor 7a Screw Pipe 7b Screw 8, 8a, 8b, 8d-8f Gauge Disc Cutter 9, 9a to 9f Cutter head face plate 10, 10a to 10f First diameter 11, 11a to 11f Inner peripheral part disk cutter 12, 12a to 12c, 12e, 12f Gauge cutter 13, 13a to 13f Cutter bit 14, 14a to 14f Second diameter 15, 15a to 15f Mounting opening 16, 16a to 16f Sediment intake opening 17, 17b to 17f Face plate 18, 18b Auxiliary gauge cutter 19, 19b Mounting hole 20 Outer peripheral disc cutter Oa to Of Rotation center

Claims (7)

[Claims] 1. A cutter head of a small-diameter pipe propulsion machine equipped with a disk cutter having a rotating shaft for each rotation on a predetermined diameter of a cutter head face plate, and when no disk cutter other than those described above is provided, sand is taken in. When the opening for use and a disc cutter other than the above are provided, the disc cutter and the opening for taking in the sand should be arranged on the cutter head face plate that is point-symmetric with respect to the rotation center of the cutter head. A cutter head for small-diameter pipe propulsion machines. 2. The cutter head for a small diameter pipe propulsion machine according to claim 1, wherein the disc cutters arranged outside the predetermined diameter are gauge disc cutters, and the gauge disc cutter is orthogonal to the predetermined diameter. A cutter head for a small-diameter pipe propulsion device, which is arranged on the diameter of the cutter head. 3. The cutter head for a small diameter pipe propulsion device according to claim 1, wherein a detachable face plate is attached to the earth and sand intake opening. 4. The cutter head for a small-bore pipe propulsion machine according to claim 3, wherein the removable face plate comprises one kind or a plurality of kinds of face plates having different areas. head. 5. The cutter head for a small diameter tube propulsion device according to claim 3, wherein the removable face plate is a flywheel by adjusting the weight. 6. A cutter head of a small diameter pipe propulsion machine equipped with a disk cutter having a rotation shaft for each rotation on a predetermined diameter of the cutter head face plate, in addition to the mounting opening of the disk cutter, for the intake of earth and sand. A small-diameter pipe propulsion device characterized in that the opening is installed on the cutter head face plate, the opening for sand and sand intake is partially blocked, and the face plate has a removable face plate on which a tip for outermost circumference gauging is installed. Cutter head. 7. A propulsion method for a small-diameter pipe propulsion device using the cutter head of a small-diameter pipe propulsion device according to claim 3, wherein one or more types of removable face plates having different areas are replaced. A propulsion method for a small-diameter pipe propulsion device, characterized by adjusting the opening ratio according to the soil quality.