JPH01318697A - Shield excavator - Google Patents

Abstract

PURPOSE:To smoothly move a press ring by a method in which a press ring is set inside of the shield outer shell in a moving and operating manner in the axial direction and a lubricant-packing space is formed between the press ring and the outer shell. CONSTITUTION:Shield rings 7a are annularly set at an interval of L1 on the periphery of a press ring 7 to form a lubricant-packing space 7b, and a lubricant supply tube 7c is provided to the ring 7. Cement concrete or mortar 21 is packed into a tail void 30 formed after the shield outer wall 2 moved as the ring 7 moves in the direction of B. In this case, even when the ring 7 moves frequently in the direction of arrow A or B reciprocally in relation to the shell 2, the intrusion of concrete or mortar particles into the aperture 31 can be prevented by the action of lubricant packed into the space 7b. The moving action of the ring 7 can thus be smoothened.

Description

Detailed Description of the Invention (a) Industrial Application The present invention is directed to cast-in-place concrete and mortar (in this specification, "concrete mortar" means "concrete" or "mortar"). This relates to a shield excavator that excavates while constructing a lining.

(b), Conventional technology Recently, in Japanese Patent Application Laid-Open No. 62-194399, etc., it has been proposed that the lining of a tunnel excavated by a shield excavator can be constructed with cast-in-place concrete and mortar, regardless of the segment. A proposal has been made for a machine.

In such a similar machine, a method is known in which the tail void is filled using a T-nib ring that is movably provided inside the shield shell.

(C) 6 Problems to be Solved by the Invention However, in this case, the press ring frequently moves in and out of the shield outer shell, so there is no concrete between the press ring and the outer shell.
There is a risk that foreign matter such as mortar particles may enter the press ring, making it impossible to smoothly insert and remove the press ring.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide a shield excavator in which foreign substances such as concrete and mortar do not enter between the press ring and the shield shell.

(d) Means for solving the problem, that is, the present invention provides a lubricant filling space (7b) filled with lSI lubricant between the press ring (7) and the outer shell (2).
It is composed by forming.

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. The following r (el
The same applies to the column ``, action''.

(e) 0 effect With the above-described configuration, the present invention provides a lubricant filling space (7b
) acts to prevent foreign matter from entering between the press ring (7) and the outer shell (2).

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view showing an embodiment of the shield excavator according to the present invention, and FIG. 2 is an enlarged view of the press ring section.

As shown in FIG. 1, the shield excavator 1 has a cylindrical outer shell 2, and the front surface of the outer shell 2, that is, the first
A cutter 3 is rotatably supported on the left side of the figure. The cutter 3 is driven by a drive motor 5 provided on a partition wall 2a of the outer shell 2, which is provided to block the space inside the outer shell 2 in the left-right direction.
Further, a plurality of excavation jacks 6 are arranged in a circular ring along the outer shell 2 on the partition wall 2a. A ram 6a is provided on the intermediate jack 6 so as to be able to protrude and retreat in the direction of the arrow A1B, and furthermore, a cylindrical press ring 7 is provided inside the outer shell 2 and is in contact with the inner surface of the outer shell 2. It is provided so as to be slidable in the directions of arrows A and B. A plurality of press ring jacks 9 are arranged on the press ring 7 at predetermined intervals along the outer shell 2.
Furthermore, in the press ring 7, a plurality of concrete discharge pipes (not shown) have discharge ports at their tips extending 7 m from the side surface of the press ring 7.
, that is, it is provided facing toward the rear of the shield excavator 1. In addition, as shown in FIG.
m, 7a are installed in a ring shape at a predetermined interval L1,
Seal ring 7a.

A lubricant filling space 7b is provided between the press rings 7a in a cylindrical shape so as to surround the press ring 7.

The lubricant filling space 7b is filled with f4 lubricant such as grease, and the press ring 7 is further provided with a lubricant supply pipe 7C.
is provided with one end opening into the fli lubricant filling space 7b.

By the way, a gauge ring 11 formed in an annular shape is attached to the tip of the ram 6a of the digging jack 6.
The gauge ring 11 has an engagement groove 11a.
1 is perforated in an annular shape over the entire circumference. In addition, the gauge ring 11 has a formwork 13 assembled in an annular shape.
They are provided together with the reinforcing member 12 in a manner that they are connected in the left-right direction in FIG.

Since the seal-principle bending machine 1 has the above configuration, when cutting a tunnel 15, the cutter 3 is rotated by the drive motor 5, and the ram 6a of the excavation jack 6 is rotated in the direction shown in FIG. 1B. The cutter 3 is pushed in the direction of the face 16, that is, in the direction of arrow A, through the partition wall 2a and the outer shell 2. Then, due to the pressing force, the cutter 3 and the face 16 come into contact with each other with a predetermined contact pressure, and the face 16 is cut by the cutter 3. At the same time, the outer shell 2 is propelled in the entry direction and the tunnel 15 is moved by the shield excavator. 1, i.e. the 1st
It is formed on the right side of the figure.

In this way, as the tunnel 15 is formed, it is necessary to construct a lining 20 in order to prevent the collapsed earth 19 from collapsing.
-194.399 etc. is performed using a known method. Therefore, detailed explanation of the construction procedure of the lining will be omitted here, but by moving the press ring 7 in the direction of arrow B in FIG. 2, the tail void 30 formed after the shield outer shell 2 is moved Perform filling work with concrete mortar 21. At this time, press ring 7 and outer shell 2
Since the press ring 7 is frequently moved in and out of the press ring 7 in the direction of the arrow AXB (the axial direction of the outer shell 2), concrete/mortar particles enter the gap 31 between the press ring 7 and the outer shell 2 and get caught. There is a risk that the press ring 7 may not be inserted or removed smoothly.

However, in the gap 31 between the press ring 7 and the outer shell 2, as shown in FIG.
) Since the KA lubricant filling space 7b is formed, even if the press ring 7 moves back and forth in the directions of arrows A and B, the lubricant filled in the lubricant filling space 7b prevents concrete, mortar particles, etc. Intrusion into the gap 31 is prevented, and the movement of the press ring 7 is performed smoothly.

Note that the lubricant filling space 7b does not necessarily include the press ring 7.
It does not have to be formed on the side, it may be formed on the outer shell 2 side, and it goes without saying that it may be formed independently without being attached to the outer shell 2 or the press ring 7. be.

(g) 0 Effects of the Invention As explained above, according to the present invention, the outer shell 2 is provided,
A press ring 7 is placed inside the outer shell 2 in the axial direction of the outer shell 2 (
In the shield excavator 1 which is provided to be movable and driveable in the directions of arrows A and B), an fA lubricant filling space 7b filled with lubricant is formed between the press ring 7 and the outer shell 2. Even when the press ring 7 is reciprocated in the axial direction, foreign matter such as concrete or mortar particles will not get caught in the gap 31 between the press ring 7 and the outer shell 2, and the press ring 7 will move smoothly. movement becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a shield excavator according to the present invention, and FIG. 2 is an enlarged view of a press ring portion. 1...Shield excavator 2・Outer shell 7 Press ring 7b...Lubricant filling space Applicant Mitsui Construction Co., Ltd. Agent Patent attorney Phase 1) Shinji (and 2 others)

Claims (1)

[Claims] A shield excavator having an outer shell and a press ring provided inside the outer shell so as to be movable and driven in the axial direction of the outer shell, comprising: a lubricant between the press ring and the outer shell; A shield excavator configured by forming a space filled with lubricant.