JPH0743268Y2 - Split structure of shield machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a shield excavator dividing structure which is advantageous in strength and the like while facilitating transportation and assembly.

[Conventional technology and its problems]

Generally, when the diameter of a shield machine (also referred to as a shield machine) becomes large, it must be divided into small blocks according to transportation road conditions from the factory to the site and on-site assembly conditions. The division method is the production cost, factory production capacity,
It is determined in consideration of product accuracy and product function.

On the other hand, in addition to the above-mentioned purpose of convenience of transportation, assembly, etc., the shield machine main body is divided into a plurality of pieces in the circumferential direction in order to facilitate excavation of the curved portion and to freely expand the pipe diameter ( (See Japanese Patent Laid-Open No. 56-105098), facilitate transportation from factories and carry-in into the ground, and assemble in underground tunnels.
Japanese Patent Publication Sho-62, which is divided into multiple parts in the circumferential direction for easy disassembly.
There is also a prefabricated expansion shield machine as described in Japanese Patent No. 16313.

In addition, a shield machine is also proposed in which the shield machine body is divided into a plurality of parts (front body part, middle body part, rear body part) in the machine length direction so that curved construction is easy (see JP-A-1-125491). .

Therefore, the conventional shield machine body is divided in the circumferential direction or the machine length direction for various purposes as described above.

By the way, as shown in FIG.
The front torso portion 23 has a unitary structure which may be divided in the circumferential direction but is not divided in the radial direction as described above. Therefore, the front body part against external load
The deformation of 23 may directly adversely affect the bearing portion 25, which is the rotation support portion of the cutter disk 24 interposed between the swivel portion and the fixed portion, and may damage the bearing portion 25.
There is also a possibility that the earth-and-sand seal portion 26 interposed between the swivel portion and the fixed portion may be directly adversely affected to impair its sealing property (water blocking property). Reference numeral 27 in the drawing denotes a turning drive device for the cutter disk 24.

Further, since the front body portion 23 is an integral structure that is not divided in the radial direction at all, it is difficult to obtain a small block that enables transportation, assembly, etc. unless the number of divisions in the circumferential direction is increased. However, the more split surfaces, that is, the joint surfaces, the more disadvantageous the strength becomes, and it becomes difficult to secure the product accuracy during assembly. On the other hand, there is a risk that the sealability (waterproofness) may decrease due to the displacement of the joint surfaces. is there.

Therefore, an object of the present invention is to solve such a conventional problem by forming the front body of the shield machine in the radial direction by dividing into an outer cylinder and an inner cylinder.

[Means for Solving the Problems]

In order to achieve the above object, the gist of the present invention is to provide a cutter disc, which is divided into a plurality of shield machine main bodies including a front body portion in the machine length direction, and which is supported by bearings at the front portion of the shield machine main body and is driven to rotate. In a shield machine having a earth and sand seal portion between the swivel portion and the front body portion which is a fixed portion, the front body portion is divided into an outer cylinder and an inner cylinder in the radial direction, and the outer cylinder and the inner cylinder are formed. It is a divided structure of a shield machine, characterized in that the cylinders are elastically connected and a sealing means is provided between the outer cylinder and the inner cylinder. A shield excavator division structure is characterized in that the outer cylinder and the inner cylinder are elastically connected by a torque plate.

[Action]

According to the above-mentioned structure, the outer cylinder and the inner cylinder forming the front body portion need only be divided into a smaller number than in the case of the integral structure, and the joint portion is reduced accordingly, which is advantageous in strength. Further, the deformation of the outer cylinder due to the external force applied to the outer cylinder is not directly transmitted to the inner cylinder as it is, and the strength of the inner cylinder is advantageous. Even if muddy water pressure is applied by the sealing means between the inner cylinder and the outer cylinder, the sealing performance does not deteriorate. Further, the sealing means can also be used as the torque plate. In addition, the rotation stop is surely exhibited by providing the torque plate.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic side view of a muddy water shield machine to which the present invention is applied, and FIG. 2 is an enlarged view of a main part of FIG. In this shield machine, a cutter disk 6 is provided in front of a main body (hereinafter referred to as a shield machine body) 1 of a cylindrical shield machine, and the cutter disk 6 during excavation is used by a turning drive unit 7.
While being supported by the bearing portion 8 by means of, it is driven to rotate (turn) around the machine shaft 9. Then, the excavated earth and sand and the like are taken into the space (chamber) 11 between the cutter disk 6 and the bulkhead 10 together with the muddy water,
While being stirred by the agitator 12, it is discharged from the mud discharge pipe 13. Numeral 14 is a water pipe, and numeral 15 is a shield jack for digging a shield machine by obtaining a digging reaction force from the segment 16. Since mud pressure is applied to the bulkhead 10 during the excavation, the earth and sand seal 17 is interposed between the swivel part and the fixed part to ensure water shutoff.

The shield machine body 1 is divided into a hood portion 2, a front body portion 3, a middle body portion 4 and a rear body portion 5 in the machine length direction for convenience of transportation, transportation, assembly and the like. And it is also divided into four in the circumferential direction. Further, the front portion 3 is further divided into an outer cylinder 3A and an inner cylinder 3B in the radial direction thereof, and each is divided into four in the circumferential direction as shown in FIG. The circumferentially divided portions form a joint portion J, and the outer cylinder 3A and the inner cylinder 3B are bolted and integrated at the joint portion J, respectively. In this respect, the middle trunk portion 4, the rear trunk portion 5 and the like are also the same. Thus, when the diameter of the shield machine is about 14 mφ as in the above embodiment, the shield machine main body 1 is divided into 5 parts in the machine length direction and 4 parts in the circumferential direction, which means 20 parts as a whole. .

Next, the divided structure of the front body portion 3 will be described in detail with reference to an enlarged view of an essential part of FIG. 2. A hood portion 2 having a triangular cross section is arranged at the rear portion of the cutter disk 6, and a substantially rectangular shape is formed at the rear portion. An outer cylinder 3A having a box cross section is connected, and an inner cylinder 3B having a substantially L-shaped box cross section is internally provided (fitted) inside the outer cylinder 3A. In addition,
As mentioned above, 12 is an agitator provided on the outer cylinder 3A, 7 is a turning drive device for the cutter disk 6 provided on the inner cylinder 3B, and a sand / sand seal is provided between the turning part and the fixed part (front body part 3).
17 are installed. As shown in the figure, the outer cylinder 3A and the inner cylinder 3B that form the front body 3 are fitted together with almost no gap, and the front body 3 is separated from the outer cylinder 3A and the inner cylinder in the radial direction thereof. The outer cylinder 3A and the inner cylinder 3B have a front surface that forms a part of the bulkhead 10 by forming a structure in which the outer cylinder 3A and the inner cylinder 3B are formed separately.

On the other hand, a step 3a is provided on the inner surface of the rear part of the outer cylinder 3A, and the inner cylinder 3B
It is designed to support the load in the direction of the captain (machine axis). However, the outer cylinder 3A does not have the step 3a, and the outer cylinder 3A
A step may be provided between the inner body portion 4 and the inner body portion 4 to support the axial load applied to the inner cylinder 3B by the inner body portion 4.

3 and 4 are enlarged views of a connecting portion between the front portion (bulk head portion) and the rear portion (the step 3a portion) of the outer cylinder 3A and the inner cylinder 3B.

In FIG. 3, the front surface of the outer cylinder 3A and the front surface of the inner cylinder 3B form part of the bulkhead 10 as described above, and mud pressure is applied to the bulkhead 10 during the excavation. Therefore, the outer cylinder 3A and the inner cylinder
A groove 18 for mounting a U packing is formed at a corner portion of 3B, and a U packing 19 is mounted in the groove 18 as shown in the drawing. A thin seal plate (having an annular shape as a whole) 20 is fixed to the front surface of the U-packing 19 across the outer cylinder 3A and the inner cylinder 3B. Therefore, the outer cylinder 3A and the inner cylinder 3B are elastically connected by the thin sealing plate 20, and at the same time, the sealing plate 20 itself forms a sealing means similar to the U packing 19 and exhibits a sealing function against muddy water. is doing. Therefore, the U packing 19 may be omitted in some cases.

On the other hand, at the rear end of the inner cylinder 3B, as shown in FIG.
An L-shaped torque plate 21 is fixed between the rear end surface of the inner cylinder 3B and the rear inner surface of the outer cylinder 3A.
This torque plate 21 is used for the turning drive device 7 for the cutter disk 6.
When the is operated, it works as a rotation stop so that the inner cylinder 3B does not rotate together. As shown, the torque plate 21 is L-shaped,
At the time of installation, the space 21a is fixed between the outer cylinder 3A and the inner cylinder 3B so that the outer cylinder 3A and the inner cylinder 3B are fixed to each other. This is for elastically connecting with 3B. The seal plate 20 described above may be used also as the torque plate 21. In this case, the fourth plate
The illustrated torque plate 21 is unnecessary.

As described above, the outer cylinder 3A and the inner cylinder 3B usually have the seal plate 2 at the front.
0, the rear portion is only elastically connected by the torque plate 21, and elastic deformation of each of the outer cylinder 3A and the inner cylinder 3B is allowed.
That is, by interrupting the continuity between the outer cylinder 3A and the inner cylinder 3B,
For example, due to earth pressure or mud pressure from the outer peripheral surface of the outer cylinder 3A, the outer cylinder
Even if 3A is deformed, the deformation is not directly transmitted to the inner cylinder 3B. This causes the strength advantage of the inner cylinder 3B. On the other hand, by dividing the front body 3 into the outer cylinder 3A and the inner cylinder 3B in this manner, the number of divisions in the circumferential direction can be reduced as compared with the conventional integral structure. This is outer cylinder 3A and inner cylinder 3B
If and are integrated, the radial height increases,
Although it is necessary to increase the number of divisions in the circumferential direction for convenience of transportation, assembly, etc., if the outer cylinder 3A and the inner cylinder 3B are separated as in the present invention, the height in the radial direction of each becomes low. The reason is that even if the number of divisions is reduced, a small block that does not hinder transportation and assembly can be formed. On the other hand, since the number of divisions is reduced, the joints of the division surfaces (joint portion J in FIG. 5) are less likely to be displaced, and the contact surface of the earth and sand seal 17 (FIG. 2) is damaged. In addition to the decrease, it is advantageous in terms of strength because the number of joints J decreases.

[Effect of device]

According to the present invention described above, the number of divisions of the front body can be reduced by separately dividing the front body into the outer cylinder and the inner cylinder, and the number of joint surfaces in the circumferential direction is small. It is easy to ensure accuracy, and there are few steps on the contact surface of the earth and sand seal, so there is no adverse effect on the sealing performance (water blocking). Further, the deformation of the outer cylinder due to the external force is not directly transmitted to the inner cylinder, and the strength of the inner cylinder is advantageous.

The outer cylinder and the inner cylinder are elastically connected with each other by a seal plate or a torque plate, and elastic deformation is allowed between them, which is advantageous in strength. In addition, since the seal plate and the torque plate, which are responsible for the elastic connection, are simply welded between the inner and outer cylinders, there is no large welded portion, and therefore the distortion caused by this does not occur.

[Brief description of drawings]

FIG. 1 is a side sectional view of a muddy water shield machine to which the present invention is applied, and FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 and FIG.
FIG. 5 is an enlarged view of the front and rear joints of the outer cylinder and the inner cylinder, and FIG. 5 is a circumferentially divided view of the outer cylinder and the inner cylinder. FIG. 6 is an explanatory diagram of a conventional technique. 1 ... Shield machine body, 2 ... Hood part, 3 ... Front body part, 3A ...
Outer cylinder, 3B ... Inner cylinder, 4 ... Middle body, 5 ... Rear body, 6 ... Cutter disk, 7 ... Slewing drive device, 8 ... Bearing part, 10 ... Bulkhead, 17 ... Sediment seal, 19 ... U packing , 20 ... Seal plate, 21 ... Torque plate.

Continuation of front page (56) Reference JP-A-1-125491 (JP, A) JP-A-63-308194 (JP, A) JP-B-43-19707 (JP, B1)

Claims (2)

[Scope of utility model registration request] 1. A shield machine main body is divided into a plurality of parts including a front body portion in a machine length direction, and has a cutter disk supported by a bearing portion and pivotally driven in the front part of the shield machine main body, and fixed to the pivoting portion. In a shield machine having a earth and sand seal part between the front body part which is a part of the front body part, the front body part is divided into an outer cylinder and an inner cylinder in the radial direction, and the outer cylinder and the inner cylinder are elastically connected. At the same time, a seal excavator dividing structure is characterized in that sealing means is provided between the outer cylinder and the inner cylinder. 2. A divided structure for a shield machine, wherein the outer cylinder and the inner cylinder according to claim 1 are elastically connected by a torque plate.