JPH05187186A - Folding system for shield machine - Google Patents

Abstract

PURPOSE:To reduce the consumption quantity of grease and prevent the breakage of a seal packing. CONSTITUTION:In the folding device of a shield machine foldably connected with the rear end section of a front barrel 1 and the front end section of a rear barrel 4 inserted into the rear end section of the front barrel 1, a seal packing 5 is formed into a steel wire brush shape, and the iron plate 6 of the steel wire brush-like seal packing 5 is fixed to the outer periphery of the front end section of the rear barrel 4 by welding. When a shield machine main body is folded in the middle, the following property of the packing 5 is improved, the fluidity of grease is improved by the seal effect of the grease filled in a grease fill section 7, and the consumption quantity of grease is reduced. Assembling is simplified, the breakage of the seal packing 5 at the time of assembling is prevented, and the workability for seal handling is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center folding mechanism for a shield machine.

[0002]

2. Description of the Related Art The center folding mechanism of a conventional shield machine is shown in FIG.
Describing with reference to FIG. 6, 1 in FIGS. 3 and 4 is a front body, 2 is a packing protection plate, 3 is a follow-up earth and sand seal packing, 4 is a rear body, 7 is a grease enclosing portion, 9 is a packing holding metal fitting,
Reference numeral 0 denotes a urethane lip-type seal packing, and the lip-type seal packing 10 is made of a urethane material or the like. Numeral 11 is a mounting bolt for mounting the packing holding metal fitting 9. The front and rear end portions of the urethane lip type seal packing 10 are attached to the front end portion of the rear body 4 through the bolts 11, and the tip portion of the lip type seal packing 10 is attached. Is in contact with the inner surface of the rear end of the front body 1.

Grease is enclosed in the grease enclosure 7 in order to cope with the intrusion of earth and sand into the shield machine when the lip of the lip-type seal packing 10 is damaged. 14 is a center folding guide. FIG. 5 shows a half-folded state of the shield machine. FIG. 6 shows a state inside the shield machine main body at the time of center folding, where 1 is a front body,
4'is the rear body tail plate, 11 is the coil spring,
12 is a shield jack and 13 is a segment.

[0004]

In the shield machine capable of folding in the middle shown in FIG. 3 to FIG. 6, in the case where a sharp curve digging is carried out in the middle folding part of the shield machine, it is in a severe digging state. Sediment and muddy water enter the shield machine body from the folding part (split part). To prevent this,
The packing protection plate 2 and the follow-up type sand / sealing packing 3 are provided. However, when the protection plate 2 and the sealing packing 3 are damaged due to some cause during the excavation, the lip-type sealing / sealing packing 10 installed inside is also affected by the damage. When it is damaged, it is damaged and the sealing property against muddy water deteriorates.

Grease is enclosed in the grease enclosing section 7 in order to cope with the intrusion of earth and sand into the shield machine when the lip portion of the seal packing 10 is damaged. It was enormous and costly. The present invention is proposed in view of the above problems, and the object thereof is to reduce the consumption of grease. Another point is to provide a center folding mechanism for a shield machine that can prevent damage to the seal packing.

[0006]

In order to achieve the above object, the present invention connects a rear end portion of a front body and a front end portion of a rear body inserted in the rear end portion of the front body such that the rear body can be folded in the middle. In the center folding device of the shield machine described above, the steel wire brush-like seal packing is mounted in the annular gap formed between the front body rear end portion and the rear body front end portion.

[0007]

In the center folding mechanism of the shield machine of the present invention, the seal packing is made into a steel wire brush shape as described above, and the iron plate of this steel wire brush-like seal packing is fixed to the outer peripheral surface of the front end portion of the rear body by welding. Therefore, when the shield machine body is folded in the middle, the followability of the packing is improved, and the grease filled in the grease sealing portion has a sealing effect, the fluidity of the grease is improved, and the consumption of grease is reduced. Further, the assembling is simplified, the seal packing is prevented from being damaged during the assembling, and the workability of handling the seal is improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The center folding mechanism of the shield machine of the present invention will now be described with reference to an embodiment shown in FIGS.
Is a packing protection plate, 3 is a follow-up earth and sand seal packing, 4
Is a rear body, 7 is a grease-filled portion, 5 is a steel wire brush-like seal packing, and the brush-like seal packing 5 has a plurality of iron plates (for example, a circumferential length of 100 mm and a front-back direction length of 17 mm).
0 mm bent type iron plate) 6 and brush-shaped steel wire (wire mesh) 8 sandwiching the brush-shaped steel wire 8 by the bent portion of each iron plate 6, and joining these iron plates 6 in the circumferential direction,
The steel wire brush-like seal packing 5 is configured. Then, each iron plate 6 is fixed to the outer peripheral surface of the front end portion of the rear body 4 by welding. Further, grease is filled in the grease filling portion 7. Moreover, 14 is a center folding guide.

Next, the operation of the center folding mechanism of the shield machine shown in FIGS. Seal packing 5
Is made into a steel wire brush, and the steel plate 6 of this steel wire brush-like seal packing 5 is fixed to the outer peripheral surface of the front end portion of the rear body 4 by welding. There is also a sealing effect of the grease filled in the grease filling portion 7, the fluidity of the grease is improved, and the consumption amount of grease is reduced.

Further, the assembling is simplified, the seal packing 5 is not damaged at the time of assembling, and the workability of handling the seal is improved.

[0011]

As described above, in the center folding mechanism of the shield machine of the present invention, the seal packing is made into a steel wire brush shape, and the steel plate of the steel wire brush-like seal packing is welded to the outer peripheral surface of the front end portion of the rear body. Since it is fixed, the followability of the packing can be improved when the shield machine body is folded in the middle, and there is also the sealing effect of the grease enclosed in the grease enclosure, the fluidity of the grease is improved and the consumption of grease can be saved. ..

Further, the assembling can be simplified, the seal packing can be prevented from being damaged during the assembling, and the workability of handling the seal can be improved.

[Brief description of drawings]

FIG. 1 is a vertical side view showing an embodiment of a center folding mechanism of a shield machine of the present invention.

FIG. 2 is an enlarged perspective view of a steel wire brush seal packing.

FIG. 3 is a vertical sectional side view showing a center folding mechanism of a conventional shield machine.

FIG. 4 is an enlarged vertical side view of a portion indicated by an arrow A in FIG.

FIG. 5 is an explanatory diagram showing a folded state of the shield machine.

FIG. 6 is an explanatory diagram of moistening the inside of the shield machine main body during center folding.

[Explanation of symbols]

 1 Front body 2 Packing plate protection plate 3 Tracking type earth and sand seal packing 4 Rear body 5 Steel wire brush seal packing 6 Iron plate 6 7 Grease encapsulation part 8 Brush steel wire

Claims (1)

[Claims] 1. A center folding device for a shield machine, wherein a rear end portion of a front body and a front end portion of a rear body inserted in the rear end portion of the front body are connected to each other so as to allow center folding. A center folding mechanism for a shield machine, in which a steel wire brush-like seal packing is mounted in an annular gap formed between the front end and the front end.