JPH0835392A - Seal structure of adit for starting shield machine - Google Patents

Abstract

PURPOSE:To improve the sealing property, by fixing one end of a rubber sheet to the inner surface of a buried ring, and fixing the other end to the inner surface of the buried ring after turning over the other end, so as to form a blocked space zone, and enabling a fluid to be sucked and discharged in the blocked space zone. CONSTITUTION:A reinforcing layer 2 is buried in a rubber sheet 1 which is formed by making a seal member A in an endless form, both ends of the reinforcing layer 2 are divided in divisions 21 and 22, and a rubber member 3 to be a wedge B is held between the divisions 21 and 22, and integrated. Then, the wedge B is held by a bracket 51, and fixed to the inner side of a buried ring 4 through a bolt 6 and a nut 7, the sheet 1 is turned over to cover the bracket 51, and fixed to a bracket 52, and a blocked space P is composed by the sheet 1 and a part of the ring 4. Then, a hole to deliver the air into the space P is provided on the ring 4, the air is filled to the space P, and the sealing property is controlled by regulating the air pressure. Even though some difference is generated to the interval between the ring and a shield machine, a water leakage can be prevented by changing the filling condition of the air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for fixing to a plate of a joint between a shaft and a shaft.
The present invention relates to a seal structure that expands and contracts by a fluid in order to prevent water leakage between the rudder machine and the segment.

[0002]

2. Description of the Related Art In recent years, a shield construction method has been widely used when excavating an underpass or a tunnel. The shield method is a method of digging a vertical shaft and then forming a horizontal shaft such as a tunnel by a shield machine.The soil layer is cut by a rotary cutter as the shield machine is driven, and the cutter chamber is cut. -Soil and sand taken in is carried by a screw conveyor installed in the cutter chamber, and then discharged to the outside by a belt conveyor. Then, while promoting the shield machine, the segments are sequentially incorporated, and the backfill material is injected and filled between the segment and the excavated soil surface.

FIG. 9 is a cross-sectional view showing the seal structure of the conventional shield machine starting lateral shaft. In the figure, 21 is a vertical shaft and 22 is a horizontal shaft. And 23 is an embedded ring provided at the boundary between the vertical shaft 21 and the horizontal shaft 22. In this embedding ring 23, a rubber packing material 24 is arranged toward the center thereof, and a large number of flapper metal fittings 25 are arranged along this, and fixed by bolts 26 and nuts 27. Then, as the shield machine 28 shown by the alternate long and short dash line advances in the direction of the arrow, the packing material 24 is curved by the flapper metal fitting 25 as shown by the dotted line, and the boundary surface is sealed. In addition, 30 is an embedded ring 23
The pipe provided in the above is used for filling the fluid and injecting the backing material to further secure the seal.

However, it is obvious that the seal structure using the packing material 24 cannot follow the change of the shield machine 28 and the segment diameter, and the sealability is poor. Furthermore, the water pressure increases as the depth of the side pit increases,
It is a fact that the sealing property becomes worse.

[0005]

SUMMARY OF THE INVENTION The present invention provides a seal structure capable of obtaining a desired seal pressure by following the diameter of a shield machine or a segment, and the seal structure is adapted to the groundwater pressure. It is an object of the present invention to provide a characteristic seal structure in which the seal pressure can be selected and the seal property is increased by increasing the seal structure in plural.

[0006]

The present invention has been made to achieve the above objects, and the gist of the present invention is to provide an embedded ring provided at a connection port of a shaft extending from a shaft. At least one seal member is fixed to the inside of the seal member, and one end of the endless rubber sheet is fixed to the inner surface of the embedding ring, and the other end is folded back to embed the fixing portion. It is fixed to the inner surface of the ring to form a closed air space, and fluid can be sucked and discharged in the closed air space.
It is related to the structure.

Usually, a buried ring is provided with a valve device for sucking and discharging a fluid represented by air in a closed air space. A rubber material having a hardness higher than that of the rubber sheet is integrally joined to both ends of the rubber sheet constituting the seal member to form a wedge, and a plurality of layers of fiber reinforcement are provided in the rubber sheet. The layers are buried to withstand the fluid pressure. Particularly preferably, the fiber reinforcing layer embedded in the rubber sheet constituting the seal member is divided at both ends of the rubber sheet to divide the fiber reinforcing layer into a rubber material having a hardness higher than that of the rubber sheet. The divided parts are integrally connected.
The code angle of the fiber reinforcing layer is preferably embedded in the rubber at an angle of 50 to 60 degrees with respect to the endless direction of the rubber sheet.

Preferably, in order to make the rubber sheet durable, the fiber sheet is divided by including a fiber reinforcing layer, and a fiber reinforcing layer is further provided at a portion sandwiching a rubber material having a hardness higher than that of the rubber sheet. It is preferably buried, and this reinforcement may be necessary especially for high pressure fluid products.

Particularly, by forming an uneven surface on the outer peripheral surface of the rubber sheet of the seal member, preferably at a portion in contact with the shield machine, at a right angle to the propelling direction, the workability is improved and the durability is improved. It will be possible to improve.

[0010]

The present invention relates to a seal structure for a shaft for starting a shield machine having the above-mentioned structure, in which the seal is inflated by letting a fluid flow into and out of the enclosed space surrounded by the shield machine. -It increases the effect. That is, by adjusting the fluid pressure inside the seal member, the contact force between the seal member and the shield machine (or segment) is adjusted. The rubber sheet forming the seal member is composed of a single sheet, which is endless and has no connecting portion at all. Therefore, there is no fluid leakage, and the workability of preparing the embedded ring is very simple.

Further, by forming an uneven surface on the surface of the rubber sheet at the portion of the seal member that comes into contact with the shield machine, preferably at right angles to the propelling direction of the shield machine,
The pressure on the shield machine is increased, and the sealing property is improved. Further, the lubricating oil is introduced into the uneven portions, so that the sealing property is particularly improved and maintained. In this case, it is preferable to increase the hardness of the rubber sheet on the outer peripheral surface side by about 5 degrees to improve the pressure bonding property.

[0012]

The present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view of the seal member A of the present invention.
FIG. 4 is a partially enlarged sectional view of the main part thereof. FIG. 3 is a cross-sectional view of the seal member when it is fixed inside the embedded ring. By the way, 1 is a thickness T5 mm constituting the seal member A,
An endless rubber sheet having a width W of 800 mm, in which a reinforcing layer 2 made of two layers of nylon cord and having a thickness of about 1 mm is embedded in the rubber sheet 1. The proof cord having a guaranteed strength of 70 kgf / cm ² was used. The cord angle of the reinforcing layer 2 is about 55 degrees with respect to the endless direction of the seal member.

The reinforcing layer 2 is divided into 2 ₁ and 2 ₂ at both ends, and a rubber member 3 forming a wedge portion B having a hardness of 90 degrees between them.
It is sandwiched and integrated. The thickness T ₃ of the portion where the rubber material 3 was integrated was 21 mm, and the width W ₃ was 30 mm. Although the two are integrated with an adhesive, they may be integrally vulcanized and bonded when the rubber sheet 1 is vulcanized.

Now, the rubber sheet 1 is fixed to the inside of the embedding ring 4, but the wedge portions B, B are sandwiched by the brackets 5 ₁ , 5 ₂ with a space therebetween, and this is fixed by the bolt 6
And the nut 7 for fixing. In the illustrated example, the brackets 5 ₁ and 5 _{2 have} a thickness of about 4 cm.
Further, as shown in the figure, the rubber sheet 1 is folded back and fixed so as to cover _one bracket 51, and the closed space P is held by the rubber sheet 1 and a part of the embedded ring 4.
Is configured. By adjusting the positions of the brackets 5 ₁ and 5 ₂ to the left and right, the size of the closed space P can be adjusted. Although not shown, a sponge-like tape may be sandwiched between the mounting portions in order to further enhance the sealing property during mounting. The embedded ring 4 is provided with a hole 8 for sending air into the closed space P, and a pipe 9 connected to the hole 8 is provided.

In the figure, what is indicated by a chain double-dashed line is a state in which the closed space P is filled with air.
It contacts the outer peripheral surface of the rudder machine 10 (or contacts the outer peripheral surface of the segment), and its sealing property is controlled by adjusting the air pressure. Therefore, even if there is a slight difference in the distance between the embedded ring 4 and the shield machine 10 (or segment), it is possible to completely prevent water leakage by changing the air filling state in the seal member A. It is a thing. In order to improve the sealing property of the constricted portion of the wedge portion B, for example, a one-liquid silicone sealing material and a thickness of 0.5 are straddled over the constricted portion.
It can be said that it is also preferable to bond a foamed or non-foamed rubber sheet having a thickness of 2 to 3 mm through a butyl rubber tape having a thickness of 1 mm.

The sheet of Figure 4 is the invention - more preferably a cross-sectional view showing an example, divided Gomushi Le member - Further example of buried another fiber reinforced layer 2 ₃ across a split site in the sheet 1 Is. In particular, the durability is improved against the cutting of this portion when the fluid is repeatedly flowed in and out, and the structure is suitable for using the high-pressure fluid.

[0017] Figure 5 is - in DOO 1 _a surface of sheet - - outer periphery Gomushi of sheet 1 - Gomushi Le member A is an example of forming a right angle uneven surface in the propulsion direction at the site of contact of Rudomashin. That is, in this example, the uneven surface ₁₁ is formed on the surface of the outer peripheral side rubber sheet 1a of the rubber sheet 1 with _a groove having a rectangular cross section. As a result, the pressure force applied to the shield machine is increased and the sealability is improved. or,
At the time of crimping to the shield machine, the lubricating oil is filled in the groove, so that the sealing property is particularly improved and maintained. In this example, the thickness of the rubber sheet 1 _b on the inner peripheral surface side is 2 mm, the thickness of the rubber sheet 1 _a on the outer peripheral surface side is 4 mm,
The thickness of the reinforcing layer is 1.5 mm, the depth of the groove is 2 mm,
The width was 3 mm and the distance between the grooves was 15 to 20 mm.

[0018] FIG. 6 is a rubber outer peripheral side Gomushi - is an example of the concavo-convex portion of the surface of the bets 1 _a is a cross-sectional wave type concavo-convex part 1 _2. In this case, the manufacturing method of the rubber sheet 1 is relatively simple. Figure 7
And 8 are those uneven portion of the rubber surface was cross M-type, FIG. 7 than them that the cross section of the convex portion was set to M type (1 _3), shea - increasing the surface pressure between Rudomashin sheet - This is a further improvement of the rubbing property. Figure 8 shows the convex part with a special M type (1 ₄ )
In this example, since the lubricating oil is less likely to come out from the groove, the durability of the sealing property and the sliding property is increased. Although not shown, shea - Rudomashin Gomushi contact with - the bets 1 _a surface, forming a concave-convex portion of the thread-contour shape sheet - thereby contributing to the improvement of the Le resistance.

[0019]

The present invention provides a seal structure in which water leakage is completely eliminated by changing the filling state of the fluid in the seal member. Property and durability are also improved, and further improvement of workability is particularly effective.

[Brief description of drawings]

FIG. 1 is a perspective view of a seal member of the present invention.

FIG. 2 is a partially enlarged sectional view of the seal member shown in FIG.

FIG. 3 is a view of the seal of FIG. 1 when it is fixed to an embedded ring.
It is a sectional view of a ruler member.

FIG. 4 is a partially enlarged sectional view showing another example of the seal member.

FIG. 5 is a cross-sectional view of a seal member in which an uneven surface having a rectangular cross section is formed on the outer peripheral surface of a rubber sheet.

FIG. 6 is a cross-sectional view of a seal member in which an uneven surface having a corrugated cross section is formed on the outer peripheral surface of a rubber sheet.

FIG. 7 is a cross-sectional view of a seal member in which a rubber sheet has an outer peripheral surface provided with an uneven surface having an M-shaped cross section.

FIG. 8 is a cross-sectional view of a seal member in which a rubber sheet has an outer peripheral surface provided with an uneven surface having a special M-shaped section.

FIG. 9 is a cross-sectional view showing a conventional seal method.

[Explanation of symbols]

Sheet of A ‥‥ present invention - seal member, B ‥‥ wedge, P ‥‥ closed space, 1 ‥‥ Gomushi - _{DOO, 1 1, 1 2, 1} 3, 1 4 ‥‥ Gomushi - DOO outer peripheral surface irregularity part, 1 _a ‥‥ outer peripheral side Gomushi - DOO, 1 _b ‥‥ inner circumferential side Gomushi - _{DOO, 2,2 1, 2 2, 2} 3 ‥‥ reinforcing layer, 3 ‥‥ high hardness rubber material, 4 ‥‥ buried Ring, 5 ₁ , 5 ₂ ... Bracket, 6 ... Bolt, 7 ... Nut, 8 ... Hole for feeding air into the closed space P, 9 ... Piping, 10 ... Shield machine.

Claims (8)

[Claims] 1. At least one seal member is fixed to the inside of an embedding ring provided at a connection port of a shaft extending from a shaft, and the seal member is an endless rubber seal.
One end of the gland is fixed to the inner surface of the embedding ring, and the other end is folded back to enclose the fixing part and fixed to the inner surface of the embedding ring to form a closed air space, and fluid can be sucked and discharged into the closed air space. Sealing structure for a side shaft for launching a shield machine. 2. The seal structure for a shaft digging shaft for starting a shield machine according to claim 1, wherein the embedded ring is provided with a valve device for sucking and discharging a fluid in a closed air space. 3. A shield machine starting lateral shaft according to claim 1, wherein a rubber material having a hardness higher than that of the rubber sheet is integrally connected to both ends of the rubber sheet constituting the seal member. -Le structure. 4. The seal structure for a shaft pit for starting a shield machine according to claim 1, wherein a fiber reinforcement layer is embedded in a rubber sheet constituting the seal member. 5. A rubber material having a hardness higher than that of the rubber sheet, in which a plurality of fiber reinforcing layers are embedded in a rubber sheet constituting a seal member, and the fiber reinforcing layers are divided at both ends thereof. The seal structure for a shaft for starting a shield machine according to claim 1, wherein the seals are integrally connected to each other. 6. The shield machine according to claim 1, wherein the rubber sheet is divided so as to include a fiber reinforcing layer, and the fiber reinforcing layer is further embedded in a portion sandwiching a rubber material having a hardness higher than that of the rubber sheet. Seal structure for a side shaft for starting. 7. The seal structure for a shaft pit for starting a shield machine according to claim 1, wherein an uneven surface is formed on a portion of the outer peripheral surface of the rubber sheet of the seal member that comes into contact with the shield machine. 8. The seal structure for a shaft for starting a shield machine according to claim 7, wherein the uneven surface is formed at a right angle to the propelling direction of the shield machine.