JPH04157Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a shield tunneling machine, and more particularly, to a shield tunneling machine with an improved structure for attaching a sealing material to a cutter disk support portion.

[Prior art]

For example, in a mud shield excavator, which is one type of mechanical excavation, a mud feeding pipe and a mud drainage pipe installed along the machine axis penetrate the bulkhead and open into a cut-off chamber, and from the mud-feeding pipe, through the cut-off chamber, to the face. Mud water is supplied, and the pressure of the mud water prevents the face from collapsing. The excavator excavates using the reaction force obtained from the tunnel wall, and the earth and sand excavated by the cutter disc is taken into the cutter chamber along with muddy water and carried out backwards by the mud removal pipe.

The cutter disk is provided at the forefront of the shield excavator, and an annular cutter disk support part integral with the cutter disk is connected to a drive source inside the machine through the outer periphery of the bulkhead, and rotates while being supported by a rotation bearing. A plurality of sealing materials are disposed at the mounting position of the cutter disk support portion to prevent dirt and muddy water taken into the cutter chamber from entering the inside of the machine. The sealing material is attached to the outer periphery of a cylindrical member integrated with the bulkhead and the outer periphery of the cutter disk support portion, and has, for example, a two-ring shape. The sealing material located on the inner cylindrical member near the machine shaft is fixed, and the sealing material located on the outer cutter disk support part far from the machine shaft rotates. The latter slides into contact with the inside of the shield body to prevent dirt and muddy water from entering.

[Problem that the invention attempts to solve]

The annular sealing material described above is attached to the outer periphery of the cutter disk support part and the outer periphery of the cylindrical member that is integrated with the bulkhead, but the mounting position of the sealing material does not change until it wears out and is discarded. . As a result, the inner circumferential surfaces of the shield body and the cutter disk support portion that are in sliding contact with the sealing material continue to be in sliding contact with the lip of the seal at the same position. Therefore, the inner circumferential surface of each seal may become dented due to abrasion due to sliding contact with the sealing material, or the sealing material may wear out, impairing its sealing function.
It is necessary to replace the sealing material and sliding contact member.

By the way, in order to replace the sealing material or sliding contact member, it is necessary to stop the shield tunneling machine and remove parts and members near the cutter disk and bulkhead. Additionally, since the replacement work will be carried out in a narrow tunnel, the face will need to be manually excavated and widened in order to provide space to temporarily store the removed cutter disc. Therefore, there is a problem that manual digging work is laborious and time consuming, and costs increase. Furthermore, there are problems such as the ground of the tunnel sinking or collapsing after the extra excavation and widening. In addition, as the service life and distance of shield tunneling machines are increasing, it is desired that the sealing portion be adapted to accommodate this. However, stopping the excavator to replace the sealing material or sliding contact member has the problem of significantly reducing excavation efficiency.

The present invention was developed to solve the above-mentioned problems, and its purpose is to simplify the replacement of the sealing material and sliding contact member and change the sliding contact position, extend the life of the sliding contact member, and improve the sealing function. This makes it possible to reduce expenses by eliminating the need for extra excavation and widening of the tunnel, which is required for replacement work, to avoid subsidence and collapse of the tunnel ground after extra excavation and widening, and to improve excavation efficiency. It is an object of the present invention to provide a shield tunneling machine capable of achieving the following objectives.

[Means for solving problems]

As shown in FIG. 1, the features of the shield excavator of the present invention include a cutter disk 2 equipped with an excavator and driven to rotate, a rotary bearing 3 that supports the cutter disk 2, and a rotary bearing 3 that protects the rotary bearing 3. Mechanical digging type shield excavator 1 having sealing materials 4 and 5
and the inner circumference 24 of the cutter disk support part 21
A seal mounting ring 6 to which a sealing material 4 is attached that slides into contact with the outer periphery 26 of the cutter disk support part 21
A seal sliding contact ring 7 that slides into contact with the seal material 5 attached to the seal member 5 is installed, and the seal mounting ring 6 and the seal sliding contact ring 7 are each provided with jacks 8A and 8B for displacing them in the direction of the machine axis 15. It is.

[Effect]

When the shield tunneling machine 1 excavates, the rotating bearing 3
The cutter disk 2 supported by is rotationally driven,
The excavation tool is used to excavate the face as the excavation progresses. During the excavation, the front sealing material of the plurality of sealing materials 4 fixed to the outer periphery of the seal attachment ring 6 comes into sliding contact with the inner periphery 24 of the cutter disk support part 21, and is attached to the outer periphery 26 of the cutter disk support part 21. The front sealing material of the plurality of sealing materials 5 is in sliding contact with the inner periphery 29 of the seal sliding ring 7. Therefore, excavated earth and sand and pressurized mud water in the cut chamber are blocked by the sealing materials 4 and 5 and do not enter the inside of the machine. If the shield excavator 1 excavates a certain distance or for a certain period of time, jack 8
A and 8B are slightly actuated to displace the seal mounting ring 6 and the seal sliding contact ring 7 in the direction of the machine shaft 15, thereby changing the contact position of the seal members 4 and 5. Sliding surfaces 24, 29 due to friction with sealing materials 4, 5
Since the sliding contact position can be changed before the sealing function is impaired due to wear and the growth of dents and grooves, the deterioration of the sealing function can be prevented.

Furthermore, when the sealing materials 4 and 5 are worn out by the excavation of the shield tunneling machine 1, the stroke amount of the jacks 8A and 8B is increased to move the seal mounting ring 6 and the seal sliding ring 7. As a result, the new rear sealing materials 4 and 5 can be brought into contact with the sliding surfaces 24 and 29, and the sealing function is maintained.

[Effect of idea]

A seal mounting ring with a sealing material attached to the inner periphery of the cutter disk support and a seal sliding ring fitted with a sealing material attached to the outer periphery of the cutter disk support are installed. Each contact ring is equipped with a jack that displaces them in the machine axis direction, making it easier and faster to replace seals and sliding contact members and change the sliding contact position, saving time and effort for replacement. The time can be significantly reduced. In addition, since there is no need for manual excavation work such as large-scale over-excavation widening required for replacement work, risks such as ground subsidence and collapse due to excavation are avoided, and expenses can be significantly reduced. can. Furthermore, since the sliding contact position can be changed simply and quickly, the sealing function is improved and the life of the sliding member is extended, and interruptions in excavation can be avoided, and excavation efficiency can be improved.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the shield tunneling machine of this invention will be explained in detail based on the Example.

Figure 1 shows the main parts at the front lower part of a muddy water type shield excavator 1, which is an example of a mechanical excavation type, including a cutter disk 2 equipped with an excavator and driven to rotate, and a rotary bearing 3 that supports the cutter disk 2. , a plurality of sealing materials 4 and 5 that protect the rotation bearing 3
, seal mounting ring 6, and seal sliding contact ring 7
and jacks 8A and 8B. Note that the skin plate 9 has a cylindrical shape, and the machine shaft 15
is located at the top of the figure, and its vertical structure is almost symmetrical around its axis.

The shield tunneling machine 1 is provided with a bulkhead 13 that separates a cut chamber 11 formed within a shield body 10 made of a skin plate 9 from an interior 12 of the machine. In the bulkhead 13,
A cylindrical member 14 is fixed, and its outer peripheral surface serves as a sliding surface 16 when the seal mounting ring 6 is slid in the direction of the machine shaft 15. Further, a bearing stand 9A having a cylindrical sliding surface 17 for slidingly contacting the seal sliding ring 7 in the direction of the machine axis 15 is integrated into the front part of the skin plate 9, and the rotation bearing 3 is attached thereto. Further, a ring girder 9B is formed on which a hydraulic motor 19 for driving the cutter disk 2 is mounted while attaching the shield jack 18.

An annular hollow cutter disk support part 21 is inserted into an annular space 20 formed by the sliding surfaces 16 and 17, and a ring gear 22 is attached to the rear end thereof. The ring gear 22 is meshed with a pinion 23 of the hydraulic motor 19 and transmits the rotation of the hydraulic motor 19 to the cutter disk 2. Note that the cutter disk 2 has, for example, four (one shown in the figure) arms 2 attached to the cutter disk support portion 21.
It is integrated with the cutter disk support part 21 via A. The outer circumferential surface 25 of the seal mounting ring 6 provided inside the cutter disk support portion 21 includes:
A plurality of (four in the figure) sealing materials 4 are attached. The inner periphery 24 of the cutter disk support part 21 is a sliding surface that slides on two of the sealing materials 4 attached to the seal attachment ring 6, and the rear portion of the sliding surface 24 has a step. Surface 24A
is formed. Therefore, the seal lips (not shown) of the two rear seals face the surface 24A without contacting each other. On the other hand, on the outer periphery 26 of the cutter disk support part 21, a plurality of
A sealing material 5 (individual) is attached so as to rotate together with the cutter disk support portion 21.

In addition, in this example, the above-mentioned sealing materials 4 and 5 are respectively divided into two groups M1 and M2 and a group N.
1 and N2, and in a state where the lips of the sealing materials 4 and 5 of groups M1 and N1 are in sliding contact with the sliding contact surface 24 and the sliding contact surface 29 described later, the other groups M2 and N2 are divided into groups M2 and N2.
The second sealing materials 4 and 5 are separated from the sliding surfaces 24 and 29 and face the surfaces 24A and 29A with a gap in between.
Note that the groups M1 and N1 may be made up of three sealants 4 and 5, and the groups M2 and N2 are made up of one, or vice versa, and the number of sealants 4 and 5 may be changed to four. It may be more than that. The key is to select a number that can maintain a sufficient sealing function and arrange them in appropriate sections.

The seal mounting ring 6 has, for example, a structure in which two hollow bodies that can be assembled separately are integrated, and its inner periphery 27 is shaped to be able to freely slide on the sliding surface 16 of the cylindrical member 14. A gasket (not shown) is inserted to prevent muddy water. The sealing material 4 is attached to the outer periphery 25 as described above, and in this example, the group M1 is attached to the front part and the group M2 is attached to the rear part. Further, the rear portion thereof is connected to the jack 8A in the contracted state toward the front, so that the seal mounting ring 6 can move forward along the machine axis 15 direction in the illustrated position.

On the other hand, the seal sliding contact ring 7 has a structure in which two hollow bodies are integrated, and its outer periphery 28 is shaped to be able to freely slide on the sliding surface 17 of the bearing stand 9A, in order to prevent dirt and muddy water. A gasket (not shown) is inserted. Further, since the rear part of the hollow body is connected to the jack 8B which is in an extended state, the seal sliding ring 7 can be moved backward along the direction of the machine axis 15. In addition, the seal sliding contact ring 7
A sliding surface 29 and a stepped surface 29A are formed on the inner periphery of the sliding surface 29, and the sliding surface 29 slides on the two sealing materials 5 of the rotating group N1, and the two sealing materials 5 of the other group N2. are arranged to face the surface 29A with a gap in between.

According to the embodiment having such a configuration, the sealing material can be replaced and the sealing function can be maintained in the following manner.

When the shield excavator 1 excavates, the drive hydraulic motor 19 rotates the cutter disk support part 21 supported by the rotary bearing 3 via the pinion 23 and the ring gear 22. The rotation is transmitted to the cutter disk 2 which is integrated with the arm 2A. On the other hand, mud water is supplied to the face from a mud feeding pipe (not shown) to prevent the face from collapsing, and the shield jack 18 uses the reaction force caused by pressing the end face of the tunnel wall constructed with the segment ring to cause the shield excavator 1 Dig in and find Katsutada Disk 2.
The face is excavated with a drilling tool (not shown) attached to the.

The earth and sand excavated and mixed into the pressurized mud water is taken into the cutter chamber 11, and the mud and earth are mixed with the seal material 4 between the cutter disk support part 21 and the seal mounting ring 6, and the seal sliding contact ring 7. Pressurize the front surface of the sealing material 5 between them. However, the two sealing materials 4 in group M1 are in close contact with the inner periphery 24 of the rotating cutter disk support portion 21 to prevent foreign matter such as muddy water or earth and sand from entering the interior 12 of the machine. Further, the two seal members 5 in the rotating group N1 are in close contact with the inner periphery 29 of the seal sliding ring 7 to prevent foreign matter from entering. In this way, the earth and sand and muddy water from the cut chamber 11 are prevented from entering the machine interior 12, so that the shield excavator 1 can continue digging smoothly. When the digging for a certain distance or a certain period of time is finished, the jack 8A is extended by a small stroke amount to move the seal mounting ring 6 forward by that amount, while the jack 8B is reduced by a small stroke amount to move the seal sliding ring 6 forward. Move 7 back. A new design that can avoid the development of dents and grooves that have begun to occur on the sliding surfaces 24 and 29 due to the contact with the flexible lips of the sealing materials 4 and 5, and can fully demonstrate the sealing function. Sliding surfaces 24, 29
You can change the position.

When digging continues while maintaining the sealing function by sequentially changing the position to the new sliding contact surfaces 24 and 29 described above, the sealing materials 4 and 5 in groups M1 and N1
is worn out. At this time, the stroke amount of the jack 8A is greatly increased to move the seal mounting ring 6 forward, and the two seal members 4 of group M2 are brought into contact with the sliding surface 24. Along with this, group M
The two sealing materials 4 of 1 protrude into the cut chamber 11. If it is necessary to remove the protrusion, the front part of the seal attachment ring 6 can be separated from the rear part. Note that if there is no inconvenience in processing muddy water or earth and sand, it may be left in the protruding state. On the other hand, Jyatsuki 8B
The stroke amount of is greatly reduced to move the seal sliding contact ring 7 backward, the two sealing materials 5 of group N1 are released from contact with the sliding surface 29, and the two sealing materials 5 of group N2 are newly replaced. is brought into contact with the sliding surface 29. In this way, the unused sealing materials 4 and 5 come into contact with the sliding surfaces 24 and 29, respectively, to prevent foreign matter from entering. In the space created in front of the seal material 5 as the seal sliding ring 7 retreats, a protection plate 30 shown by a two-dot chain line is attached as necessary. By repeatedly moving the seal mounting ring 6 and the seal sliding contact ring 7 forward and backward slightly as described above, and by replacing the sealing material as necessary, the life of the sliding contact portion can be extended and the seal can be Functions can be maintained.

In the above embodiment, the seal attachment ring 6 attached to the inside of the cutter disk support part 21 is pushed forward, and the seal sliding ring 7 attached to the outside is pulled back. , the pushing and pulling directions may be opposite to those described above, or the moving directions of both rings may be the same. In addition, although the mud water type shield excavator was described as an example, in mechanical excavation type shield excavators such as earth pressure type shield excavators and other excavators that use cutter disks as peripheral support structures,
The present invention can be applied.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main part of the lower front part of the shield tunneling machine of the present invention. DESCRIPTION OF SYMBOLS 1...Shield excavator, 2...Katsuta disk, 3...Rotating bearing, 4, 5...Sealing material, 6...
...Seal mounting ring, 7...Seal sliding contact ring,
8A, 8B...Jacket, 15...Machine axis, 21...
... cutter disk support part, 24 ... inner periphery (sliding surface), 26 ... outer periphery.

Claims (1)

[Scope of Claim for Utility Model Registration] A cutter disk equipped with a digging tool and driven to rotate, a rotary bearing that supports the cutter disk,
In a mechanical digging type shield excavator that has a seal material that protects the rotating bearing, there is a seal mounting ring fitted with a seal material that slides on the inner periphery of the cutter disk support, and a seal attached to the outer periphery of the cutter disk support. A shield excavator, characterized in that a seal sliding contact ring that slides in contact with a material is installed, and a jack that displaces each of the seal mounting ring and the seal sliding contact ring in the machine axis direction is provided.