JPH053397U - Protective structure for the middle-breaking part of the middle-breaking shield machine - Google Patents

Abstract

(57) [Summary] [Purpose] The amount of sediment that enters the center-breaking seal part is reduced, and even if the center-folding angle is large or long-distance excavation, the seal material does not break and the water stops to the end. A possible seal structure is provided. [Structure] The front part of the front outer shell is inserted into the rear end part of the front outer shell, and a seal material is interposed between the insertion parts. In a center-breaking shield excavator in which a plurality of jacks that connect the rear wall and the inner wall of the rear outer shell behind the insertion portion are installed at intervals in the circumferential direction, the seal material is used. A seal material protection material 6 in which a urethane or rubber plate is sandwiched between reinforcing plates 7a and 7b such as steel plates is attached to the rear end of the front outer shell by inclining it, and the front end of the rubber plate or urethane 7c is attached to the rear outer shell. By making contact with the front outer wall spherical surface portion 2a, a seal structure is formed between the seal material 3 and the seal protective material 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a seal protection structure for a center-folded portion of a center-breaking shield machine. It

[0002]

[Prior art]

  A conventional center-break type shield machine will be described with reference to FIGS. Front outer shell 1 The front portion of the rear shell 2 is inserted into the rear end portion, and the front portion of the insertion is not inserted. Prevent the ingress of earth and sand, groundwater, and backfill material on the inner peripheral wall of the rear end of the front outer shell. A seal material 3 is attached. A bracket fixed to the inner peripheral wall of the rear part of the front outer shell 1. And a bracket fixed to the front inner peripheral wall of the rear outer shell 2 have a plurality of shield jaws. The jack 4 and the center-folding jack 5 are installed at intervals in the circumferential direction (FIG. 3). One end of the middle folding jack 5 is connected to the bracket of the front outer shell 1 by a pin 5a, The end is freely connected to the bracket of the rear outer shell 2 by a pin 5b.

[0003]   As a seal material protection structure for such a middle bent portion, there are the following ones. Shi -A material which is not protected by only the lumber 3 (Fig. 3 of Japanese Utility Model Laid-Open No. 58-106494). Shi -Reduced the invasion of earth and sand by devising the shape of the lever part (Actual No. Sho 58-106494) (See FIG. 4 of the publication). As shown in Fig. 4, at the rear end of the front shell with the seal material attached A leaf spring 8 was attached to scrape off the earth and sand.

[0004]   In all of these cases, the sand and sand penetrated the seal material made of rubber or urethane. I couldn't prevent it from entering enough. This causes friction and damage to the seal material. However, as a result, the sealing effect becomes insufficient and there are many problems of water leakage. did.

[0005]

[Problems to be solved by the device]

  In consideration of the problems of the conventional technology, the amount of sediment that enters the center-breaking seal part is reduced, Even if the water is large or when excavating for a long distance, the seal material will not be damaged and the water will be stopped until the end. It is an object of the present invention to provide a seal structure that can be used.

[0006]

[Means for Solving the Problems]

    Insert the front part of the rear outer shell into the rear end of the front outer shell, and insert a seal material between the insertion parts. The inner wall of the front outer shell in front of the insertion part and behind the insertion part A plurality of jacks connecting the two with the inner wall of the outer shell are circumferentially spaced. In the installed center-breaking shield machine, replace the urethane or rubber plate 7c with the steel plates 7a, 7b. Seal material protection material 6 sandwiched by a reinforcing plate consisting of Attach it to the rear end of the part 1a by inclining it and contact it with the outer spherical surface part 2a of the front part of the rear shell. Thus, a sealed structure is provided between the seal material 3 and the seal protective material 6.   Further, the sealed space between the seal material 3 and the seal protective material 6 was filled with grease.

[0007]

【Example】

  A description will be given based on FIG. 1a is a seal housing portion provided at the rear end of the front shell. Shi -A ball provided with the seal material 3 attached to the inside of the reel housing 1a and provided on the outer periphery of the front part of the rear shell. It is in contact with the surface portion 2a.

[0008]   The seal material 3 is protected by a seal protection material 6. The seal protecting material 6 is, for example, steel. A urethane or rubber plate 7c is sandwiched between the reinforcing plates 7a and 7b made of plates. It is configured to have. And for the spherical portion 2a provided on the outer peripheral surface of the front end of the rear shell Mounted so that it is inclined rearward, and its tip contacts the spherical surface 2a. It has been burned.

[0009]   When excavating a tunnel using a shield machine, the tunnel should be installed under a public road. In most cases, it is not allowed to enter the private land, so It is necessary to excavate with a matched curve.

[0010]   In such a case, the shield machine folds the center of the fuselage in a V shape and curves the tunnel. You can drill with. Then, as shown in Fig. 1, excavation is performed by changing the center bending angle θ. The bend (R) of the tunnel can be freely set.

[0011]   Therefore, when the central bending angle θ becomes large, the central bending portion becomes a spherical surface portion 2a as shown in FIG. However, the width of the spherical surface 2a causes the seal material 3 to slide for structural and economic reasons. It is usually the smallest width. Therefore, at the time of center bending, the seal material 3 is placed inside the spherical portion 2a. However, the seal protector 6 moves out of the spherical surface part and moves into the straight part 2b and is greatly deformed. Maintain a closed structure.

[0012]

【effect】

  Conventionally, there are many cases where the seal protection material 6 is not attached, and even if it is attached, Since it is a leaf spring as shown in Fig. 4, it cannot structurally completely prevent the intrusion of earth and sand. However, according to the present invention, since the seal protecting material 6 is made of urethane or rubber, Since it has flexibility, the seal protection material 6 moves smoothly from the spherical surface portion 2a to the linear portion 2b. Can move. The seal protection material 6 is sandwiched by the reinforcing plates (including spring steel) 7a and 7b. Since it is reinforced by this, damage prevention and deformation amount of the seal protection member 6 can be limited. The seal protector 6 is attached so as to be inclined with respect to the spherical surface 2a, so that the soil can be scraped off. Effect and intrusion prevention effect are large. Seal between seal material 3 and seal protection material 6 With the structure, it is possible to fill with grease etc. Also, there is no direct contact with the seal material 3, and so on.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a bent portion of the present invention.

FIG. 2 is a cross-sectional view of a known center bent portion.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a cross-sectional view showing a known seal material protection structure, which is indicated by I in FIG.
FIG.

[Explanation of symbols]

1 front shell 1a Seal storage 2 Rear shell 2a spherical surface 2b Straight section 3 seal materials 4 shield jack 5 Middle-breaking jack 5a, 5b pin 6 seal protection material 7a, 7b Reinforcing plate 7c Rubber plate or urethane

Continued front page    (72) Creator Kozobuchi Hirozo             Sumitomo Heavy Industries, 19 Natsushima-cho, Yokosuka City, Kanagawa Prefecture             Mechanical industry Co., Ltd. Oppama Shipyard

Claims (2)

[Scope of utility model registration request] 1. A front portion of a rear outer shell is inserted into a rear end portion of the front outer shell, a seal material is interposed between the insertion portions, and an inner wall portion of the front outer shell is located in front of the insertion portion. , A center-breaking shield machine having a plurality of jacks, which are connected to the inner wall of the rear outer shell behind the insertion portion, at intervals in the circumferential direction, a urethane or rubber plate (7c) is sandwiched between reinforcing plates (7a, 7b) such as steel plates, and a sealing material protection material (6) is attached to the end surface of the front shell outer rear shell storage portion (1a) with an inclination. By making contact with the outer wall spherical surface part (2a) of the front part of the rear side shell, a sealed structure is provided between the seal material and the seal protective material, which is characterized by a middle-breaking type shield excavation. Sealing structure for the middle broken part of the machine. 2. A center-breaking section shield in a center-breaking shield machine according to claim 1, wherein a sealed space between the seal material (3) and the seal protecting material (6) is filled with grease. Le protective structure.