JPH0428880B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a shield excavator, and more particularly, to an excavator that is capable of tilting with respect to the front body of the cutter disk shield body and can cope with excavation in sharp curves. It is. This can be used in the field of excavating tunnels with a small curve radius.

[Conventional technology]

When a tunnel is to be excavated in a curved manner using a shield excavator, a mechanical shield excavator 1 as shown in FIG. 2, for example, is conventionally employed. This is face 2
A side over cutter device 4 is provided in the radial direction of the cutter disk 3 for excavating the cutter. By rotating the advanced side overcutter 5 together with the cutter disk 3, the extra digging required for turning is performed and the excavation diameter is expanded, and an appropriate number of shield jacks provided in the shield main body 6 are By varying the amount of extension of 7, it is possible to advance the curve.

However, there is a limit to the amount of protrusion of the side overcutter 5, and furthermore, the earth and sand excavated by the side overcutter 5 does not completely flow into the cleft chamber 8. As a result, the actual situation is that the amount of excavation is limited to merely softening the ground, and it is often difficult to secure the amount of excess excavation required for curve excavation. In order to make it easier for the shield tunneling machine to move forward, it has been proposed to separate the shield body into front and rear parts and bend it to make it easier for the front body to bend in the forward direction. For example, such an example is described in JP-A-56-111794.

[Problem to be solved by the invention]

A further development of the above-mentioned excavator having a split shell is one in which a cutter disk can be tilted relative to the front shell, as shown in FIG. This bends the cutter disk 3 in the direction 9 of the curve, and also bends the shield body 12 divided into the front body 10 and the rear body 11, so that it can easily cope with curved excavation.

However, in this type of shield excavator, as seen in Japanese Patent Application Laid-open No. 51-96139, the driving style of the cutter disk is a center driver, and the central space near the axis in the shield body is the driving device. occupied by Therefore, there is a problem in that it is difficult to secure a space for entering and exiting for ground improvement work such as replacing the cutter bit 3a during excavation or injecting chemicals into the excavation face 2. In addition, in a shield tunneling machine capable of handling sharp curves, it is desirable to shorten the divided front body length and increase the bending angle. However, in the case of a center drive type, the front body tends to be long in order to secure the storage space for the drive device, and there is a limit to how well it can handle sharp curves.

The present invention was made in view of the above-mentioned problems, and its purpose is to enable tilting of the cutter disk relative to the shield body using a hollow drum support type instead of the center drive type, and to enable tilting of the shield body relative to the shield body, which is not possible with the center drive type. A space should be secured near the axis to allow a door for workers to enter and exit the cutter chamber, and the front body with the cutter disc of the divided shield body should be made as short as possible. An object of the present invention is to provide a shield excavator that can easily cope with excavation in sharp curves.

[Means to solve the problem]

INDUSTRIAL APPLICABILITY The present invention is applied to a shield excavator that includes a rear body that is bendably connected to the rear end of a front body that has a cutter disk on the front surface.

Its characteristics are as shown in Figure 1.
A cutter drive ring 36 having a support beam 34 for securing space for the cutter chamber 45
is arranged behind the cutter disk 3. The outer circumference of this cutter drive ring 36 is supported via a cutter rotation bearing 37, and is supported on the inner circumference of the front body 2 via a spherical bearing 29 provided on the outer circumference that overlaps with this cutter rotation bearing 37. A bearing ring 31 is provided which is closed on one side by a bulkhead 42. This bearing ring 31 is connected to the axis 22 of the front body 22.
A guide jack 33 for tilting with respect to a is attached between the bearing ring 31 and the front body 22.

〔Effect of the invention〕

According to the present invention, the shield body can be bent at least in two sections, including the tilting of the cutter disk, and the cutter disk drive is of a hollow drum support type in which the cutter rotation bearing and the spherical bearing are arranged in a concentrated manner. By adopting this device, the front torso can be shortened. Therefore, it becomes possible to excavate a tunnel with a small curve radius. Also,
By adopting a hollow drum support type, space is secured near the axis of the shield body, and if a door is provided on the bulkhead, workers can enter the cutout chamber, making it easy to replace the cutout and perform other inspections and maintenance. This makes work easier, and soil improvement work such as injecting chemicals into the face becomes easier.

〔Example〕

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

Figure 1 shows a shield tunneling machine 2 to which the present invention is applied.
This is an overall vertical cross-sectional view of 0, which allows it to handle sharp curves. This uses a hollow drum support type supporting mechanism for the cutter disk 3 as a peripheral support type. This shield body 21
For example, the front body 22 is divided into a front body 22 and a rear body 23, and the front body 22 is provided with a cutter disk 3 on the front side, and the rear body 23 is provided with an erector device 54.
and an appropriate number of bending jacks 24 attached to the adjacent inner circumferential portion thereof, and are connected so as to be freely bendable.
Note that the seal 25 covered with the seal protection plate 26
is a sealing surface 30 of the rear barrel 23 processed into a spherical shape.
and the front body 22 to prevent dirt and sand from entering.

An annular support member 28 is fixed to the inner peripheral part of the front body 22 mentioned above, and a spherical bearing 2 is mounted on the inner surface of the annular support member 28.
9 is provided. A bearing ring 31 is fitted inside the spherical bearing 29, and the spherical bearing 29
In other words, the cutter rotation bearing 37 and the spherical bearing 29 are arranged so that they overlap with the cutter rotation bearing 37 when viewed from the radial direction of the front body 22. In other words, the cutter rotation bearing 37 and the spherical bearing 29 are arranged in a concentrated manner.

The bearing ring 31 is supported on the inner periphery of the front shell 22, and its inner side is closed by a bulkhead 42, which will be described later, to define a cutter chamber 45.
A drive motor 32 for driving the cutter disk 3 is disposed at the rear part 31a of the bearing ring 31, and a guide jack 33 for tilting the bearing ring 31 with respect to its axis 22a within the front shell 22 is arranged between the bearing ring 31 and the front shell 22. is installed between.

At the front of this bearing ring 31 is a cutter drive ring 36 supported by a cutter rotation bearing 37.
The cutter disk 3 is supported by a support beam 34 which projects forward from the bearing ring 31 and which secures a space for the cutter chamber 45. The cutter rotation bearing 37 that supports the outer periphery of the cutter drive ring 36 has a drive motor 3.
A gear 35 is attached to transmit the power of 2 through a pinion 32a, and enables the cutter drive ring 36 to rotate.

At the rear end of the support member 28 described above, there is a shield jack 4 that presses the segments 40 assembled in the rear body 23 to propel the shield body 21.
1 is installed. At the center of the shield body 21 is a bulkhead 42, which is supported by a bearing ring 31. A cutter bearing seal 39 is interposed between the bulkhead 42 and the cutter drive ring 36 and between the spherical bearing 29 and the cutter drive ring 36 to ensure watertightness.

There is no device for driving the cutter disk 3 or the like near the axis 22a, which is the center of the bulkhead 42, so a space is secured, and the shield body 21 has a watertight structure so that the worker can enter and exit the cutter chamber 45 from inside the shield body 21. A door 44 is provided.
This embodiment shows a muddy water type shield excavator, and 50 is a water pipe, 51 is a mud removal pipe, and 52 is a stirrer for stirring the muddy water in the cutter chamber 45. Further, 53 is a cutter device for extra digging provided on the cutter disk 3, 54 is an erector device for segment assembly, and 55 is a tail plate 5 of the rear body 23.
This is the tail seal attached to 6.

According to such a configuration example, it can be operated as described below.

When the excavator moves straight, the shield main body 21 is locked linearly by the connecting pin 27 and a metal fitting (not shown) that fixes the front shell 22 and the rear shell 23. While pressing the segment 40 constructed by the shield jack 41, the drive motor 32 rotates the cutter disk 3 via the pinion 32a, ring gear 35, and cutter drive ring 36, and the excavator 20 excavates the face 2. move forward while The reaction force of the rotational torque of the cutter disk 3 is received by a tension bar (not shown) or a torque receiver provided on the front body 22, and is received by a spherical bearing 29.
Rotational slippage between the bearing ring 31 and the bearing ring 31 is prevented.

Next, when moving forward, the amount of extension of each of the guide jacks 33 arranged in an appropriate number in the circumferential direction is varied in order to move the cutter disk 3 in a desired direction. Since one end of the guide jack 33 is attached to the front body 22, the bearing ring 31 can be tilted in any direction by the spherical bearing 29. Since the cutter drive ring 36 is fitted to the bearing ring 31 via the cutter rotation bearing 37, the cutter disk 3 is tilted in a desired direction. Drive motor 32
And the gear 35 is tilted integrally. Power is transmitted to the cutter disk 3 without any problem. Incidentally, at the time of the tilting, the bulkhead 42 is also tilted integrally.

When the cutter disk 3 is tilted in this way, soil water that tries to enter the spherical bearing 29 is removed by the seal 4 provided on the spherical part of the spherical bearing 29.
3, and the function of the spherical bearing 29 is sufficiently maintained. In the shield main body 21, an appropriate number of bending jacks 24 have different extension amounts, and a selected pair of vertical or horizontal connecting pins 2 are connected.
The front body 22 is bent relative to the rear body 23 with 7 as the center of rotation. At this time, the seal 25 inside the seal protection plate 26 prevents water in the tunnel from entering the shield body 2.
1 is prevented from entering.

By varying the amount of extension of each shield jack 41,
When the end face 40a of the segment 40 receives a bending reaction force in a desired direction via the spreader 41a, the shield main body 21 moves forward with its entire body bent at two nodes as in FIG. Shield body 21
The drive mechanism for the cutter disk 3 provided in the front body 22 of the front body 22 is compactly housed in the front and rear, and the front body 22 is shorter than that of a center drive type. As a result, it becomes easy to bend and excavate a tunnel with a small curve radius in response to a sharp curve when excavating a tunnel.

Although the above explanation has been given using a mud water type shield excavator as an example, the present invention can be applied to any type of shield excavator as long as the cutter chamber is defined by a bulk. can do.

As can be seen from the above explanation, the outer circumference of the cutter drive ring is supported via a cutter rotation bearing, and the cutter drive ring is supported on the inner circumference of the front barrel via a spherical bearing provided on the outer circumference that overlaps with this cutter rotation bearing. Since a bearing ring is provided and the cutter rotation bearing and the spherical bearing are arranged in a concentrated manner, the shield body can be bent at least in two sections, including the tilting of the cutter disk. Moreover, instead of the center drive type, which requires a device that is long in the front and back, a hollow drum support type is used to drive the tilting cutter disk, so the drive mechanism is arranged short in the front and back, and the front body is Can be shortened. Therefore,
The bending angle of the shield body when bending at two nodes can be increased, making it possible to excavate a tunnel with a small curve radius. Furthermore, since the cutter disk is driven by the hollow drum support type drive device as described above, a space can be secured in the central region near the axis of the shield body. Therefore, if a door or the like is installed on the bulkhead, workers can enter the cutoff chamber, making it easier to replace the cutoff and other inspections and maintenance work, as well as ground improvement work such as pouring chemicals into the face. is also possible. On the other hand, if a hollow drum support type cutter disk drive device is adopted, but the front body is made long like in the case of a center drive type, a wide space can be secured in the front and rear direction, and it can be used for propulsion of excavators and auxiliary equipment. This has the advantage of making it easier to drive and perform civil engineering surveying work.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a hollow drum supported shield excavation machine to which the present invention is applied, Fig. 2 is a sectional view of a conventional shield excavation machine, and Fig. 3 is a two-bar bent shield excavation with a tilting cutter disk. FIG. 3...Katsuta disk, 22...Front body, 22a
... Axis line, 23 ... Rear body, 29 ... Spherical bearing, 3
1...Bearing ring, 33...Guide jack, 3
4... Support beam, 36... Cutter drive ring, 37... Bearing for rotating the cutter, 42... Bulkhead, 45... Cutter chamber.

Claims (1)

[Scope of Claims] 1. A shield excavator equipped with a rear body bendably connected to the rear end of the front body with a cutter disk provided on the front surface, which is arranged behind the cutter disk to occupy the space of the cutter chamber. A cutter drive ring has a support beam for securing the cutter, and the outer circumference of this cutter drive ring is supported via a cutter rotation bearing, and the above-mentioned a bearing ring supported on the inner periphery of the shell and whose inner side is closed by a bulkhead; a guide jack installed between the bearing ring and the front shell for tilting the bearing ring with respect to the axis of the front shell; A shield excavator characterized by comprising: