JPH072779Y2 - Shield machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a shield machine that facilitates curve execution in shield excavation.

[Conventional technology]

In a conventional general shield machine (hereinafter, also referred to as a shield machine), as shown in FIG. 4, a rear body 1 and a tail plate 2 of the shield machine are integrally formed, and a segment ring is used for curved construction. Due to the misalignment with S, the clearance (hereinafter referred to as tail clearance) d between the outer surface of the segment ring S and the tail plate 2 could not be taken, and the two were twisted together, making it difficult to carry out a curve.

Therefore, in order to solve this, for example, Japanese Patent Laid-Open No. 63-22999.
A curved line segment construction method as described in Japanese Patent Laid-Open Publication No. 2004-242242 has been proposed. According to this, as shown in FIG.
The segment ring is constructed by using a thin segment S ', which is different from the ordinary segment S, in order to take the tail clearance of the curved portion.

In addition, in Japanese Patent Publication No. 58-7800, the front part and the tail part of the shield machine are formed as separate bodies for the purpose of facilitating the bending movement of the shield machine, and a wedge-shaped protrusion is formed at the fitting portion of both. An interlocking connection structure has been proposed.

[Problems to be solved by the device]

However, in the former case, the thin segment is used to reduce the outer diameter of the curved portion, so the amount of tail voids increases, the amount of back-filling injection increases correspondingly, which is uneconomical, and also leads to a decrease in work efficiency. There are drawbacks. In addition, since the thin segment is used, the strength of the segment is lowered, so that it is necessary to further strengthen the constituent members of the segment. Further, in addition to the usual segments used for straight line construction, there is the inconvenience of having to prepare a thin segment dedicated to curved construction, which leads to complication of work (management) and the like.

In the case of the latter, due to the connection structure, it is possible to cope with local movements of the tail plate etc. and gentle curve construction such as meandering correction of the shield machine, but a sharp curve that changes the direction of the entire shield machine at a sharp angle. We cannot handle it in case of construction.

Therefore, in view of the above conventional problems, the present invention has an object to provide a shield machine which can use a normal segment even in a curved portion and is most suitable for a sharp curve construction.

[Means for Solving the Problems]

To achieve the above object, the present invention provides a shield excavator in which a tail plate having a tail packing is connected to a rear end portion of a rear body of the shield excavator. The shield body is formed separately from the rear body of the machine, and a spherical seat is provided at either one of the rear end of the rear body of the shield machine or the front end of the tail plate,
An engaging portion is formed on the other side, and the rear body of the shield machine and the tail plate formed separately are connected via the spherical seat and the engaging portion engaging with the spherical seat, and the spherical seat The shield machine is characterized in that a guide stopper is sandwiched between the and the engaging portion in a wedge shape.

[Action]

In the above structure, when the shield machine is swung in a predetermined direction with the spherical seat as a fulcrum to proceed with the excavation, curved construction can be facilitated. Further, even if the shield machine is shaken greatly and advanced, a large tail clearance can be always secured, so that a sharp curve can be constructed without interfering with the segment ring.

〔Example〕

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

FIG. 1 is a side sectional view of a shield machine showing a first embodiment of the present invention, and FIG. 2 is a drawing showing a second embodiment of the same.

As shown in FIGS. 1A and 1B, the tail portion of the shield machine is formed of a rear body 1 and a tail plate 2 which is a separate body from the rear body 1. A spherical seat 3 is formed at the rear end of the rear body 1, and a tail plate 2 engaging with the spherical seat 3 is provided on the rear body 1.
Are fitted and connected. A guide stopper 4 is mounted between the inner surface of the tail plate 2 and the spherical seat 3 like a wedge, and forms an engaging portion 2a that slidably contacts the spherical seat 3 together with the tail plate 2. This guide stopper 4
Is fixed to the tail plate 2 side to prevent the rear body 1 from being displaced in the axial direction. Also, the tail plate 2
Tail packing 5 is provided on the inner surface of the rear part for sealing with the segment ring. Although not shown, a plurality of lubricating oil grooves and seal packings for smooth sliding are provided on the side of the engaging portion 2a that is in sliding contact with the spherical seat 2a.

FIG. 1 (b) shows an embodiment in which pins 6 for inserting the spherical seat 3 and the engaging portion 2a in FIG. 1 (a) are provided at two upper and lower positions. In this case, since the tail plate 2 is firmly attached to the rear body 1 by a shaft, it is suitable to perform a curved construction by swinging the shield machine right and left around the pin 6. When performing the curved construction in the vertical direction, the pins 6 may be provided on the left and right.

FIG. 2 shows a second embodiment, which differs from the first embodiment in that a spherical seat 3 is formed on the tail plate 2 side and an engagement portion 1a is formed on the rear body 1 side. In this embodiment, the guide stopper 4 is sandwiched between the front ends of the tail plates 2 to form the engaging portion 1a together with the rear body 1 and prevent the rear body 1 from being displaced in the axial direction. In this case, the guide stopper 4 is fixed to the rear body 1 side.

FIG. 2 (b) shows the pin 6 inserted in the vertical position as in the case of the first embodiment in FIG. 2 (a).

In the case of the second embodiment, as compared with the first embodiment, since the rear body 1 is fitted on the outer side of the tail plate 2, dirt and sand from the rear end surface 1b of the rear body 1 against the excavation of the shield machine. It has the advantage that it is difficult for water to enter and the sealing properties are good.

In the above configuration, when performing a curved construction, as shown in FIG. 3, the shield machine is swung in a predetermined direction with the spherical seat 3 as a fulcrum to advance. By the action of the spherical seat 3, it is possible to cope with a curved construction in any direction, and it is possible to easily carry out a sharp curved construction which requires a steered angle direction change of the shield machine.

Also, the tail clearance d during the sharp curve construction
Is large and has no influence on the segment ring S (the imaginary line shows the outer diameter of the segment ring). Also,
The tail packing 5 is also not extremely crushed, so there is little wear.

[Effect of device]

As described above, according to the present invention, since the rear body of the shield machine and the tail plate are connected via the spherical seat,
This makes it easier to construct a sharp curve that requires a sudden change in direction of the shield machine. In addition, it can easily handle meandering or curved construction in any direction, and since it can take a large tail clearance even for sharp curved construction, it is not necessary to use a segment dedicated to the curved section as in the past, and work efficiency is improved. Can be improved.

[Brief description of drawings]

1 to 3 are drawings for explaining an embodiment of the present invention, and FIGS. 1 (a) and (b) are side sectional views of a shield machine showing the first embodiment, and FIG. (A) and (b) are side sectional views of the shield machine showing the second embodiment, and FIG. 3 is an explanatory view of curved construction. 4 and 5 are explanatory views of the prior art. 1 ... rear body (of shield machine), 2 ... tail plate,
1a, 2a ... Engaging part, 3 ... Spherical seat, 4 ... Guide stopper, 5 ... Tail packing, 6 ... Pin, S, S '...
Segment (ring).

Claims (1)

[Scope of utility model registration request] 1. A shield machine having a tail plate provided with a tail packing connected to a rear end of a rear body of the shield machine, wherein the tail plate provided with the tail packing is connected to the rear body of the shield machine. Is formed as a separate body, and a spherical seat is formed at one of the rear end of the rear trunk of the shield machine and the front end of the tail plate, and an engaging portion is formed at the other end of the shield trunk. A tail plate formed into a body is connected through the spherical seat and the engaging portion that engages with the spherical seat, and a guide stopper is sandwiched between the spherical seat and the engaging portion. And a shield machine.