JP2000120375A - Sealing structure for shield machine driving adit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To halve the number of fasteners and improve workability by applying the constitution that both peripheral ends of a rubber sheet having a fiber reinforcement layer buried are fixed to the inner side of a buried ring in an overlapped state as a rubber seal member for a shield machine driving adit. SOLUTION: A rubber seal member A is attached all around toward the inner side of a buried ring 3 provided within an adit 2. The rubber seal member A has a rubber sheet 4 turned up approximately at a center, and both ends 5 and 6 of the rubber seal member A are secured with a fastener 7, a bolt 8 and nut 9. The rubber sheet 4 is endless type and a fiber reinforcement layer 10 is buried therein. Also, the rubber sheet 4 has a fluid filling mouthpiece 11. Closed space P is filled with a fluid from piping 12 through the fluid filling mouthpiece 11. As a result, the rubber seal member A expands and comes in pressure contact with a shield machine 50, thereby providing a function for isolating leaking water, if any. Even if airtightness is lost from a fixing member 7, a troubleshooting or maintenance work can be easily carried out, because of the exposure of the fixing member 7 to the inner side of the buried ring 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure of a horizontal shaft for starting a shield machine.

[0002]

2. Description of the Related Art In recent years, a shield method has been widely used for excavating an underpass or a tunnel. In such a shield method, a vertical shaft is dug, and then a horizontal shaft such as a tunnel is formed by a shield machine.
The earth layer is cut by the rotating cutter with the promotion of the screw machine, and the earth and sand taken in the cutter chamber is carried by the screw conveyor provided in the chamber, and further discharged to the outside by the belt conveyor. Has become. Then, segments are sequentially incorporated while the shield machine is propelled, and a backing material is injected and filled between the segments and the excavated soil layer surface.

FIG. 2 is a sectional view showing a seal structure of a currently practiced horizontal shaft for starting a shield machine. In the figure,
Reference numeral 21 indicates a vertical shaft, 22 indicates a horizontal shaft, and 23 indicates a vertical shaft 21 and a horizontal shaft 2.
2 is a buried ring provided at the boundary with 2. A is a rubber seal member, and 31 is an endless rubber sheet constituting the rubber sheet member, in which a fiber reinforcing layer 32 is embedded, and rubber edges are provided on both edges of the rubber sheet 31. Wedge portions 33 and 34 made of a material are integrated.

Now, the rubber seal member A is fixed inside the embedding ring 23. First, the wedge portion 33 is fixed to the embedding ring 23 by a fixing bracket 35, and then the rubber seal member A is turned back. In this state, the wedge portion 34 is fixed to the embedding ring 23 by the fixing bracket 36.
37 and 38 are bolts and nuts used for fixing. Therefore, the closed space P is constituted by the rubber sheet 31 and a part of the embedding ring 23. The embedding ring 23 is provided with a hole 39 for feeding a fluid such as air, water or a liquid resin material into the closed space P, and a pipe 40 connected to the hole 39 is provided.

[0005] In the figure, what is indicated by a two-dot chain line is a diagram when the closed space P is filled with water from, for example, a pipe 40, and the rubber seal member A is connected to a shield machine 50 (or a segment).
The sealing property is controlled by adjusting the filling amount of the filling fluid. Therefore, even if there is some deviation in the gap between the embedding ring 23 and the shield machine 50 (or segment), it is possible to completely prevent water leakage by adjusting the filling amount of the fluid in the rubber seal member A. It has become. In addition, as a specific example of the filling fluid, air or water is used, and in some cases, a two-component room-temperature-setting thermosetting urethane resin is also used.

[0006] Although this technique has a remarkably improved sealability as compared with the techniques implemented up to that time, there is still a point to be improved, for example, both rubber seal members. In addition to the necessity of a large number of fixing brackets for fixing the rim, in the event that there is an airtight leak from the fixing bracket 35 inside the rubber seal member, this maintenance is extremely difficult, and the shielding machine may be started. In such a case, maintenance may not be possible.

[0007]

SUMMARY OF THE INVENTION The present invention is an improvement of the conventional seal structure, and thus not only requires a small number of fixing brackets, but also improves the workability in terms of maintenance. This provides a file structure.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a seal for a horizontal shaft for starting a shield machine in which a rubber seal member is mounted endlessly around the inside of a buried ring provided in a horizontal shaft extending from a vertical shaft. The rubber seal member is made of a rubber sheet and the fiber reinforcing layer is embedded, the rubber sheet is folded, and both edges are overlapped and fixed inside the embedding ring. That is, a fluid filling mouth is formed in the rubber sheet overlapping portion, a fluid is filled in the rubber sheet overlapping portion from the fluid filling mouth, and the rubber sheet is inflated to form a closed space. A feature is provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has the above-mentioned construction, in which both edges of a rubber seal member are aligned, and both edges are fixed to the embedding ring by one fixing member. The fixing member is always exposed inside the embedded ring. Therefore, during the maintenance, the work becomes remarkably easy compared with the conventional seal structure. Further, the number of fixing members used is reduced by almost half, so that not only the work time is shortened but also the parts cost is reduced. But there are significant benefits.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a sectional view showing a seal structure of the present invention.
1 is a vertical shaft, 2 is a horizontal shaft. And it is a state figure in which the embedding ring 3 was provided in this horizontal shaft. And rubber sheet
The rubber member A is mounted on the entire circumference of the embedment ring 3, and the rubber sheet 4 constituting the rubber seal member A is folded substantially at the center so that both edges 5 and 6 are provided. Are fixed by a fixing member, that is, a fixing bracket 7, a bolt 8, and a nut 9, and the folded rubber sheet 4 forms a closed space P.

The rubber sheet is endless, for example, having a thickness of 5 mm and a width of 800 mm. The rubber sheet is provided with a fiber reinforcing layer 10 embedded therein and further provided with a fluid filling mouthpiece 11 and is closed. The space P will be filled with fluid. In addition, the fluid filling base 11 is provided on the side of the embedding ring 3.
And a pipe 12 for supplying a fluid corresponding to the above.

Therefore, when the fluid is filled from the pipe 12 into the closed space P formed by the rubber sheet, the rubber seal member expands as shown by the one-dot chain line in the figure, and the seal is expanded.
This presses against the metal machine 50 (or a segment), and exhibits a function of shutting off even if water leakage or the like occurs here.

Even if the airtightness is lost from the fixing member, the structure is such that the fixing member is always exposed inside the embedding ring 3. , And the maintenance is significantly easier than the conventional one.

[0014]

According to the present invention, since the fixing member does not exist inside the rubber sheet member and is always exposed inside the embedding ring, it is extremely excellent in terms of maintenance. Furthermore, the number of fixtures for mounting on the embedding ring is reduced by almost half, workability during construction is improved, and the cost is more advantageous.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a seal structure of the present invention.

FIG. 2 is a cross-sectional view showing a conventional seal structure.
It is.

[Explanation of symbols]

 A rubber seal member, P closed space, 1 vertical shaft, 2 horizontal shaft, 3 embedded ring, 4 rubber sheet, 5 and 6 edges of rubber sheet, 7 fixing bracket, 8 ‥ Bolt, 9 ‥ Nut, 10 ‥ Fiber reinforcement layer, 11 ‥ Fluid filling base, 12 ‥ Piping, 50 ‥ Shield machine (segment).

Claims (1)

[Claims] 1. A seal structure for a cross shaft for starting a shield machine, wherein a rubber seal member is mounted endlessly around the entire inside of a buried ring provided in a horizontal shaft extending from a vertical shaft. The rubber member is made of a rubber sheet, the fiber reinforcing layer is embedded, the rubber sheet is folded, both edges are overlapped and fixed inside the embedding ring, and the rubber sheet is overlapped. A fluid filling mouth is formed in the portion, and a fluid is filled into the rubber sheet overlapping portion from the fluid filling mouth to expand the rubber sheet to form a closed space. Structure of the horizontal shaft for starting the shield machine.