JP2019019517A - Shield machine - Google Patents

Abstract

To provide a shield machine capable of exchanging an emergency seal to be used in combination with an articulate seal from inside the machine.SOLUTION: A shield machine includes a front barrel side connecting portion provided at a rear end portion of a front barrel and projecting inwardly of the front barrel, a rear barrel side connecting portion provided at a front end portion of a rear barrel, wherein a rear barrel side connecting portion is configured so that an outer surface thereof faces an inner surface of the front barrel and is in surface contact with an inner surface of the front barrel side connecting portion and constitutes an articulate structure together with the front barrel side connecting portion, an articulate seal disposed between the inner surface of the front barrel side connecting portion and the outer face of the rear barrel side connecting portion, an emergency seal disposed between the rear barrel side connecting portion and the front barrel in front of the front barrel side connecting portion, and a pressing mechanism detachably attached to the inner surface of the front barrel for pressing the emergency seal against the front barrel side connecting portion.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shield machine having a bent structure.

  In the shield machine having the middle folded structure, the front trunk side connecting portion provided at the rear end portion of the front barrel and the rear trunk side connecting portion provided at the front end portion of the rear barrel constitute the middle folded structure (for example, Patent Document 1). And the inner surface of a front trunk | drum side connection part and the outer surface of a rear trunk | drum side connection part are surface-contacted, and a middle-folded seal | sticker is arrange | positioned among them. The rear trunk side connecting portion extends forward beyond the front trunk side connecting portion so that the outer side surface thereof faces the inner side surface of the front barrel.

JP-A-6-108777

  In a shield machine having a middle-fold structure, the sealing performance may be insufficient only with the middle-fold seal between the front trunk side coupling part and the rear trunk side coupling part. For this reason, it is desirable to add an emergency seal in addition to the folded seal. Moreover, it is desirable that such an emergency seal can be replaced from within the machine.

  In the shield machine disclosed in Patent Document 1, a massive elastic body is disposed between the front trunk and the rear trunk side coupling portion in front of the front trunk side coupling portion. This is to prevent the jumping out and is not an emergency seal. This is also clear from the fact that the mass elastic body 3 does not have to be in contact with the seal sliding surface 1C in paragraph 0011 of Patent Document 1.

  Then, an object of this invention is to provide the shield machine which can replace | exchange the emergency seal used together with a folding seal from the inside of a machine.

  In order to solve the above problems, a shield machine according to the present invention is provided at a rear end portion of a front barrel, provided at a front barrel side connecting portion that protrudes inward from the front barrel, and at a front end portion of the rear barrel. A rear torso side connecting portion, the outer surface of the connecting portion being opposed to the inner side surface of the front torso and in surface contact with the inner side surface of the front torso side connecting portion, together with the front torso side connecting portion A rear trunk side connecting portion constituting a middle folded structure, a middle folded seal disposed between an inner side surface of the front trunk side connecting portion and an outer side surface of the rear trunk side connecting portion, and the front trunk side connecting portion An emergency seal disposed between the rear torso side connecting portion and the front torso and a front torso side connection of the emergency seal, which is detachably attached to an inner surface of the front torso And a pressing mechanism that presses against the portion.

  According to said structure, since the pressing mechanism which presses an emergency seal against a front trunk | drum side connection part is detachable, an emergency seal can be replaced | exchanged from the inside of an apparatus.

  The emergency seal includes a first sealing material positioned on the front side and a second sealing material positioned on the rear side, and the first sealing material is formed with a groove that opens while expanding rearward. The second sealing material may be fitted into the. According to this structure, since the pressing force by the pressing mechanism is converted into a force for expanding the groove of the first sealing material, the sealing performance can be improved.

  According to the present invention, the emergency seal used in combination with the folded seal can be replaced from within the machine.

It is a side view of the shield machine which concerns on one Embodiment of this invention. (A) And (b) is sectional drawing of a bend structure, (a) shows the state which the back trunk slid ahead with respect to the front trunk, (b) is a rear trunk relative to the front trunk. In a rotating state. It is sectional drawing along the III-III line of Fig.2 (a). It is sectional drawing of the bending structure in the shield machine of a modification.

  FIG. 1 shows a shield machine 1 according to an embodiment of the present invention. The shield machine 1 has a folded structure and includes a cutter head 2, a front cylinder 3, and a rear cylinder 4. In addition, the advancing direction of the shield machine 1 is the front, and the opposite direction is the rear.

  As shown in FIG. 2A, a front trunk side coupling portion 5 is provided at the rear end portion of the front barrel 3, and a rear trunk side coupling portion 6 is provided at the front end portion of the rear barrel 4. The front torso side connecting portion 5 and the back torso side connecting portion 6 are both cylindrical and overlap each other in the radial direction, and constitute a half-fold structure.

  The front torso side connecting portion 5 projects inward from the front torso 3. The rear trunk side coupling portion 6 extends forward beyond the front trunk side coupling portion 5 so that the outer surface 61 of the rear trunk side coupling portion 6 faces the inner side surface 31 of the front trunk 3.

  Further, the outer side surface 61 of the rear trunk side connecting portion 6 is in surface contact with the inner side surface 51 of the front trunk side connecting portion 5. Both the outer side surface 61 of the rear trunk side connection part 6 and the inner side surface 51 of the front trunk side connection part 5 are spherical surfaces.

  Between the inner side surface 51 of the front trunk side connection part 5 and the outer side surface 61 of the rear trunk side connection part 6, continuous ring-shaped center-fold seals 71 and 72 are arranged. More specifically, two circumferentially continuous grooves are formed on the inner side surface 51 of the front trunk side connecting portion 5, and the middle seals 71 and 72 are inserted into these grooves.

  A continuous ring-shaped emergency seal 8 is disposed between the outer side surface 61 of the rear trunk side coupling part 6 and the inner side surface 31 of the front trunk 3 in front of the front trunk side coupling part 5. That is, the emergency seal 8 is in close contact with the outer side surface 61 of the rear trunk side connecting portion 6 and the inner side face 31 of the front trunk 3 without a gap. In the present embodiment, the emergency seal 8 includes a first seal material 81 located on the front side and a second seal material 82 located on the rear side.

  The second sealing material 82 has a circular cross-sectional shape. The first sealing material 81 is formed with a groove that opens while spreading rearward, and the second sealing material 82 is fitted into the groove. In this embodiment, the cross-sectional shape of the groove formed in the first sealing material 81 is V-shaped, but the groove may have a flat bottom surface.

  The emergency seal 8 is pressed against the front end surface of the front torso side connecting portion 5 by the pressing mechanism 9. The pressing mechanism 9 is detachably attached to the inner side surface 31 of the front barrel 3.

  More specifically, the pressing mechanism 9 includes a ring-shaped pressing member 91 that contacts the emergency seal 8 from the front over the entire circumference. As shown in FIG. 3, the pressing member 91 is divided into a plurality of arc pieces 91 a arranged in the circumferential direction. Each arc piece 91a is provided with a screw hole 91b that is used when the arc piece 91a is pulled forward from between the front barrel 3 and the rear barrel side connecting portion 6.

  Both end portions of each arc piece 91 a are pressed by bolts 92. As shown in FIG. 2A, nut plates 32 are joined to the inner side surface 31 of the front barrel 3 at appropriate positions, and bolts 92 are screwed to these nut plates 32. A fixing nut 93 is also screwed into the bolt 92.

  With such a structure, by operating the bolt 92, the relative slide amount between the front cylinder 3 and the rear cylinder 4 as shown in FIG. 2A or the front cylinder 3 as shown in FIG. The pressing force of the emergency seal 8 against the front trunk side connecting portion 5 can be adjusted according to the relative rotation amount between the rear cylinder 4 and the rear trunk 4. Thereby, sufficient sealing performance can always be ensured. In particular, in this embodiment, since the pressing force by the pressing mechanism 9 is converted into a force for expanding the groove of the first sealing material 81, the sealing performance can be improved.

  Moreover, since the pressing mechanism 9 which presses the emergency seal 8 against the front trunk side connecting portion 5 is detachable, the emergency seal 8 can be exchanged from inside the machine. In the present embodiment, the bolt 92 can be loosened until a gap larger than the thickness of the emergency seal 8 is secured between the tip of the bolt 92 and the tip of the rear trunk side connecting portion 6 in the axial direction of the shield machine 1. For example, the pressing member 91 and the emergency seal 8 can be removed or installed from the gap. When exchanging the emergency seal 8, it is desirable to inject water-stopping material and grout material from a location close to the folded structure to ensure water-stopping.

(Modification)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, as shown in FIG. 4, a spring 95 and a receiving member 96 may be disposed between the pressing member 91 and the bolt 92. In this way, the emergency seal is always pressed against the front trunk side connecting portion 5 by the spring 95 with a force equal to or greater than a predetermined force, so that it is not necessary to operate the bolt 92 frequently.

DESCRIPTION OF SYMBOLS 1 Shield machine 3 Front trunk 31 Inner side surface 4 Rear trunk 5 Front trunk side connection part 51 Inner side surface 6 Rear trunk side connection part 61 Outer side surface 71,72 Folding seal 8 Emergency seal 81 First seal material 82 Second seal Material 9 Pressing mechanism

Claims (2)

A front torso side connecting portion that is provided at the rear end of the front torso and projects inward from the front torso;
A rear trunk side connecting portion provided at a front end portion of the rear trunk, the outer surface of which is configured to face the inner side surface of the front trunk and to be in surface contact with the inner side surface of the front trunk side connecting portion; A rear torso side connecting portion that forms a folded structure together with the front torso side connecting portion;
A folded seal disposed between the inner side surface of the front torso side connecting portion and the outer side surface of the rear torso side connecting portion;
An emergency seal disposed between the rear torso side connecting portion and the front torso in front of the front torso side connecting portion;
A pressing mechanism, which is detachably attached to the inner side surface of the front trunk, and presses the emergency seal against the front trunk side connecting portion;
Equipped with a shield machine. The emergency seal includes a first sealing material located on the front side and a second sealing material located on the rear side,
2. The shield machine according to claim 1, wherein a groove is formed in the first seal material so as to open rearward and the second seal material is fitted into the groove.

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