JPH076349B2 - Vertical shaft well seal device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wellhead seal device provided at a wellhead for starting or reaching a tunnel excavator, a propulsion pipe or the like in a vertical shaft, and particularly to a pressure resistance for supporting the back surface of an elastic seal member against external pressure. Regarding improvement of support structure.

[0002]

2. Description of the Related Art In a starting or reaching hole of a tunnel excavator in a vertical shaft, excavated earth and sand or underground water form a ring between the opening of the shaft and the outer peripheral surface of the tunnel excavator or the segment for primary lining of the tunnel. A wellhead sealing device is required to prevent the inflow into the shaft through the gap.

In the case of a starting pit, a pit sealing device is designed to prevent an external pressure from being applied to an annular gap between a pit opening and an outer peripheral surface of the tunnel digging machine when a tunnel excavator starting from a vertical shaft is located inside the pit. Then, when the segment is located in the wellhead, it is necessary to seal the annular gap between the outer peripheral surface of the segment and the wellhead opening against external pressure.

In addition, in the case of the access wellhead, a method is generally used in which an internal pressurizing container having an outer size larger than that of the tunnel excavator is previously arranged in the wellhead, and the reaching tunnel excavator is received in the container. . In such a reaching method, the tunnel excavator reaches the inside of the container, and the subsequent segment is provided in the well, and then the container is removed from the well. Therefore, the wellhead sealing device provided at the reaching wellhead needs to seal the annular gap between the outer peripheral surface of the container and the inner surface of the wellhole and then seal the annular gap between the outer peripheral surface of the segment and the inner surface of the wellhead.

Japanese Unexamined Patent Publication No. 60-148994 discloses a conventional wellhead sealing device for a starting wellhead. This wellhead sealing device is provided with a ring-shaped elastic seal member arranged on a well wall at the periphery of the starting wellhead and radially arranged around the starting wellhead with a space on the back side of the elastic seal member. A plurality of support fittings are provided, and each support fitting includes a mounting plate and a swing plate pivotally supported by the mounting plate. Then, the mounting plate of the support fitting and the elastic seal member are fixed to the pit wall by a fixing tool. With such a structure, an elastic seal member seals between the opening of the starting hole and the outer peripheral surface of the tunnel excavator or the tunnel lining material that follows, and the back side of the elastic seal member is supported by a plurality of support fittings. It can be supported against external pressure.

[0006]

In the above-described conventional sealing device, since a plurality of support fittings are arranged around the starting hole at the back side of the elastic seal member, the adjacent support members are supported. In the gap between the metal fittings, the pressing force of the elastic seal member against the wellhead wall surface is weakened, and there is a technical problem that the sealability between the elastic seal member and the starting wellhead wall surface is deteriorated against external pressure. Therefore, conventionally, a structure in which a pressing ring is separately interposed between the support fitting and the elastic seal member and the outer peripheral portion of the elastic seal member is pressed against the mine wall surface over the entire circumference by the pressing ring has been adopted. Even if such a pressing ring is used, if the elastic seal member receives external pressure and is compressed in the thickness direction, the sealing property between the elastic seal member and the pit wall surface is deteriorated, so that there is a problem in the pressure resistant sealing property. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a shaft well sealing device for a shaft which can improve the sealing property between the elastic seal member and the shaft of the shaft with a simple structure.

[0008]

The invention according to claim 1 is
A tunnel excavator, a sealing device for sealing a wellhead formed in a well wall of a vertical shaft against the external pressure for starting or reaching a propulsion pipe, the outer peripheral portion fixed to the wellhead and the wellhole size. An annular mounting plate having a smaller size and an inner peripheral portion larger than the outer dimension of the tunnel excavator, an outer peripheral portion mounted on the outer pressure receiving surface side of the mounting plate, and an inner peripheral portion smaller than the outer dimension of the tunnel excavator etc. And an annular elastic seal member having, and radially arranged on the back side of the elastic seal member along the inner peripheral portion of the mounting plate, and pivotally supported by the mounting plate so as to swing the back surface of the elastic seal member. And a plurality of rocking plates that support against external pressure.

According to a second aspect of the present invention, in the shaft entrance sealing device according to the first aspect, the outer peripheral portion of the elastic seal member is provided with an annular pressing plate disposed on the external pressure receiving surface side and the mounting plate. It is characterized in that it is sandwiched by the whole circumference and is fastened and fixed to the mounting plate by a plurality of bolts and nuts.

According to a third aspect of the present invention, in the shaft pit sealing device according to the first aspect, the attachment plate is a tubular anchor member embedded in the pit wall along an inner peripheral surface of the pit. It is characterized by being fixed to one end.

According to a fourth aspect of the present invention, in the shaft well sealing device according to the third aspect, an injection pipe for injecting a wellhead filler into the anchor member on the external pressure receiving surface side of the elastic seal member is fixed. It is characterized by being installed.

The invention according to claim 5 is the invention according to claim 3 or 4.
In the vertical shaft well sealing device described above, an annular second mounting plate having an inner peripheral portion smaller than the well size and larger than the outer size of a tunnel excavator or the like is provided at the other end of the anchor member so as to face the mounting plate. An annular second elastic seal member having an inner peripheral portion smaller than the outer dimensions of the tunnel excavator or the like is disposed on the back surface of the second mounting plate that is fixed and fixed to the second mounting plate. The outer peripheral portion of the seal member is sandwiched between the annular second pressing plate and the second mounting plate arranged on the back surface thereof in a sandwich shape, and the sealing member is fixed to the second mounting plate by a plurality of bolts and nuts. A plurality of rocking plates that are fastened and fixed and that support the back surface of the second elastic seal member against the external pressure are radially formed on the inner peripheral portion of the second pressing plate along the entire circumference of the second pressing plate. Placed,
In addition, the second pressing plate is pivotally supported so as to be swingable.

[0013]

In the shaft well sealing device according to claim 1, in order to keep the interior of the shaft airtight with respect to the outside of the shaft, the airtightness between the shaft and the mounting plate, and the elastic seal member and the mounting plate. It is important to ensure the airtightness between them and the airtightness between the elastic seal member and the tunnel excavator and the like. Here, regarding the airtightness between the mounting plate and the wellhead,
Since the outer peripheral portion of the annular mounting plate is fixed to the wellhead over the entire circumference, sufficient airtightness can be easily ensured. Regarding the airtightness between the elastic seal member and the tunnel excavator and the like, since the back surface of the elastic seal member is supported by the plurality of swing plates pivotally supported by the annular mounting plate, sufficient airtightness can be easily achieved. Can be secured. Further, since the annular elastic seal member is attached to the external pressure receiving surface side of the annular mounting plate fixedly installed at the shaft hole of the vertical shaft, when the external pressure acts on the elastic seal member, the elastic seal member receives the external pressure receiving pressure of the mounting plate. It is pressed against the surface. Therefore, high airtightness can be easily ensured between the elastic seal member and the mounting plate.

In the shaft well sealing device according to the second aspect, the outer peripheral portion of the elastic seal member is sandwiched over the entire circumference by the annular pressing plate and the annular mounting plate disposed on the external pressure receiving surface side thereof. Since it is sandwiched and fastened and fixed to the mounting plate by a plurality of bolts and nuts, the outer peripheral portion of the elastic seal member can be uniformly pressed against the external pressure receiving surface of the annular mounting plate over the entire circumference. Therefore, the airtightness between the elastic seal member and the mounting plate can be further enhanced.

In the shaft well sealing device according to the third aspect of the present invention, the mounting plate is fixed to one end of the cylindrical anchor member embedded in the shaft wall along the inner peripheral surface of the shaft hole of the shaft. The mounting strength of the mounting plate to the shaft hole of the vertical shaft becomes high, and the airtightness between the annular mounting plate and the shaft hole can be further enhanced.

In the shaft pit sealing device according to claim 4, since the anchor member is fixedly provided with the injection pipe for injecting the pit filler into the external pressure receiving surface side of the elastic seal member, the primary of the tunnel. After the lining, the filler can be easily injected into the external pressure receiving surface side of the elastic seal member in the wellhead, and the airtightness of the wellhead can be further increased by injecting the filler.

In the shaft well sealing device according to the present invention, an annular second mounting plate having an inner peripheral portion smaller than the hole diameter and larger than the outer dimension of the tunnel excavator or the like is provided at the other end of the anchor member. It is fixed facing the mounting plate,
An annular second elastic seal member having an inner peripheral portion smaller than the outer dimensions of a tunnel excavator or the like is disposed on the back surface of the second mounting plate facing the mounting plate, and the outer peripheral portion of the second elastic seal member is disposed. Is sandwiched by an annular second pressing plate and a second mounting plate arranged on the back surface thereof in a sandwich shape, and is fastened and fixed to the second mounting plate by a plurality of bolts and nuts. A plurality of oscillating plates that support the back surface of the second elastic seal member against the external pressure are radially arranged on the inner peripheral portion of the pressing plate along the entire circumference of the second pressing plate. The second elastic seal member can further enhance the airtightness of the wellhead since it is swingably pivoted.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings.

1 to 4 show a first embodiment in which the present invention is applied to a substantially circular starting wellhead. With reference to these figures, a starting hole 12 having a circular cross section, which is bored in a pit wall 11 of a vertical shaft, is provided with a pit sealing device indicated by numeral 13 as a whole. The wellhead seal device 13 includes an annular mounting plate 14, an annular elastic seal member 15 made of rubber or the like, and a plurality of swing plates 16.

As shown in detail in FIG. 3, the mounting plate 14 is smaller than the outer peripheral portion 14a fixed to the wellhead 12 and the inner diameter dimension of the wellhead 12 and larger than the outer dimension of a tunnel excavator or the like (not shown). It has a peripheral portion 14b.

The elastic seal member 15 has an outer peripheral portion 15a attached to the external pressure receiving surface 14c side of the mounting plate 14 and an inner peripheral portion 15b smaller than the outer dimensions of a tunnel excavator or the like. In FIG. 3, a virtual line A indicates the outer peripheral position of the tunnel excavator, and a virtual line B indicates the outer peripheral position of the primary lining segment following the tunnel excavator.

A plurality of swing plates 16 are radially arranged along the inner peripheral portion 14b of the mounting plate 14 on the rear surface 15d side of the elastic seal member 15, and each of them can swing on the mounting plate 14 via a pivot 17. The back surface 15d of the elastic seal member 15 pivotally supported by
Is designed to support against external pressure. Each rocking plate 16
A stopper piece 16a is provided in the vicinity of the pivotal support portion of
The stopper piece 16a is configured such that the swing plate 16 does not rotate from the vertical cross section of the wellhead 12 passing through the pivot 17 toward the inner side of the vertical shaft, or is inclined to the outer side of the wellhead 12 slightly from the vertical cross section. From this, it plays a role of restricting the rotation of the rocking plate 16 so as not to rotate further inward of the vertical shaft. As shown in FIG. 4, each pivot 17 has its both ends held by a pair of brackets 18, 18 fixed to the inner peripheral portion of the mounting plate 14.

Further, in this embodiment, the elastic seal member 1
The outer peripheral portion 15a of 5 is sandwiched by an annular pressing plate 19 and a mounting plate 14 arranged on the side of the external pressure receiving surface 15c in a sandwich shape, and is mounted by a plurality of bolts 20 and nuts 21. It is fastened and fixed to the plate 14.

Furthermore, the mounting plate 14 is a tubular anchor member 22 embedded in the mine wall 11 along the inner peripheral surface of the mine hole 12.
An anchoring pipe 22 is fixed to one end of the anchor member 22, and an injection pipe 23 for injecting a wellhead filler is fixed to the anchor member 22 on the side of the external pressure receiving surface 15c of the elastic seal member 15 in the wellhead 12.

In the shaft well sealing device of the above structure, in order to keep the inside of the shaft airtight with respect to the outside of the shaft 12, the airtightness between the shaft 12 and the mounting plate 14, the elastic seal member 15 and the mounting plate. It is important to ensure airtightness between the elastic seal member 15 and the tunnel excavator and the like. Here, regarding the airtightness between the mounting plate 14 and the wellhead 12, since the outer peripheral portion of the annular mounting plate 14 is fixed to the wellhead 12 over the entire circumference, sufficient airtightness can be easily ensured. . Regarding the airtightness between the elastic seal member 15 and the tunnel excavator or the like, as shown in FIG. 3, a plurality of rocking plates 16 pivotally supported by the annular mounting plate 14 are used for the tunnel excavator and the primary excavator. Since the rear surface 15d of the elastic seal member 15 is supported by coming into contact with the outer periphery of the lining segment and taking an inclined posture, sufficient airtightness can be easily ensured. Further, the annular elastic seal member 15 is an annular mounting plate 14 fixed to the wellhead 12 of the vertical shaft.
Since it is attached to the external pressure receiving surface 14c side of the elastic seal member 15, when the external pressure acts on the elastic seal member 15, the elastic seal member 1
5 is pressed against the external pressure receiving surface 14c of the mounting plate 14. Therefore, high airtightness can be easily ensured between the elastic seal member 15 and the mounting plate 14.

Further, in this embodiment, the elastic seal member 1
5, the outer peripheral portion 15a is sandwiched in a sandwich shape by an annular pressing plate 19 and an annular mounting plate 14 arranged on the external pressure receiving surface 15c side, and is attached by a plurality of bolts 20 and nuts 21. Since it is fastened and fixed to the plate 14, the outer peripheral portion 15a of the elastic seal member 15 can be uniformly brought into pressure contact with the external pressure receiving surface 14c of the annular mounting plate 14 over the entire circumference. Therefore, the elastic seal member 1
The airtightness between 5 and the mounting plate 14 can be further improved.

Further, in this embodiment, the mounting plate 14
Is fixed to one end of the cylindrical anchor member 22 embedded in the mine wall along the inner peripheral surface of the wellhead 12 of the vertical shaft,
The attachment strength of the attachment plate 14 to the wellhead 12 of the vertical shaft is high, and the airtightness between the annular attachment plate 14 and the wellhead 12 can be further enhanced.

Further, in this embodiment, since the anchor member 22 is fixedly provided with the injection pipe 23 for injecting the wellhead filling material on the external pressure receiving surface 15c side of the elastic seal member 15, the primary lining of the tunnel is performed. After that, the filler can be easily injected into the outer side pressure receiving surface 15c side of the elastic seal member 15 in the wellhead 12, and the airtightness of the wellhead 12 can be further increased by injecting the filler. When a hardening filler such as cement is used as the filling material, the space between the wellhead 12 and the primary lining segment can be integrally solidified with the filling material. On the other hand, when an elastic filler such as urethane foam is used,
A flexible joint structure can be formed between the wellhead 12 and the primary lining segment, and a wellhole seal device for a vertical shaft having excellent earthquake resistance can be provided.

5 and 6 show a second embodiment of the present invention. In the figure, the same components as those of the first embodiment are designated by the same reference numerals.

In this embodiment, at the other end of the anchor member 22, an annular second mounting plate 24 having an inner peripheral portion 24b smaller than the inner diameter of the wellhead 12 and larger than the outer dimension of a tunnel excavator or the like is mounted. It is fixed opposite to,
The rear surface 24d of the second mounting plate 24 facing the mounting plate 14 has an inner peripheral portion 25 smaller than the outer dimensions of the tunnel excavator or the like.
An annular second elastic seal member 25 having b is disposed,
The outer peripheral portion 25a of the second elastic seal member 25 has a rear surface 2
It is sandwiched by the annular second pressing plate 29 and the second mounting plate 24, which are arranged in 5d, in a sandwich shape,
Further, it is fastened and fixed to the second mounting plate 24 by a plurality of bolts 30 and nuts 31.

The inner peripheral portion 29b of the second pressing plate 29
A plurality of swing plates 26, which support the back surface 25d of the second elastic seal member 25 against external pressure, are radially arranged along the entire circumference of the second pressing plate 29, and the second swing plate 26 is connected to the second pressing plate 29 via the pivot 27.
The pressing plate 29 is pivotally supported so as to be swingable.

Therefore, in this second embodiment,
By injecting the filling material into the wellhead 12 at a predetermined pressure, the second pressing plate 29 can be pressed against the back surface 25d of the second elastic seal member 25 against the external pressure, so that the second mounting plate 24 and the second mounting plate 24 can be pressed against each other. High airtightness can be secured between the two elastic seal members 25. Therefore, the second holding plate 29 and the second swinging plate 26 support the back surface of the second holding plate 29.
The elastic sealing member 25 can further enhance the airtightness of the wellhead 12.

Although the illustrated embodiments have been described above, the present invention is not limited to the embodiments of the above-mentioned embodiments, and various modifications may be made to the constituent elements within the scope of the invention described in the claims. Can be added. For example, the wellhead shape is not limited to a circular or substantially circular shape,
The contour shapes of the mounting plate and the elastic seal member can be changed according to the shape of the wellhead. Further, the annular elastic seal member is not limited to a plate-like member, and may be, for example, a member having an inner peripheral side formed in a tube shape. In this case, after excavating the tunnel, by supplying compressed air into the tube portion of the elastic seal member, the tube portion can be brought into close contact with the inner surface of the wellhead and the outer periphery of the primary lining segment, etc., and the sealing effect can be enhanced. Furthermore, the wellhead seal device according to the present invention can be similarly applied to the reaching wellhead of a tunnel excavator and the starting or reaching wellhead of a propulsion pipe (fume pipe) propelled by a propulsion device in a vertical shaft. .

[0034]

As is apparent from the above description, according to the present invention, the outer peripheral portion of the annular mounting plate having the inner peripheral portion smaller than the hole size of the vertical shaft and larger than the outer size of the tunnel excavator and the like is formed in the vertical hole. Fixed to the outer peripheral portion of the annular elastic seal member having an inner peripheral portion smaller than the outer dimensions of the tunnel excavator, etc., is attached to the external pressure receiving surface side of the mounting plate, and the rear surface of the elastic seal member is resistant to external pressure. Since a plurality of swing plates that are supported by the mounting plate are radially arranged along the inner peripheral portion of the mounting plate on the back side of the elastic seal member and pivotally supported by the mounting plate so as to swing, the elastic seal member It is possible to provide a wellhead seal device for a vertical shaft that can improve the sealing performance between the shaft and the shafthole.

[Brief description of drawings]

FIG. 1 is a schematic front view of a wellhead sealing device showing a first embodiment when the present invention is applied to a starting wellhead.

2 is a schematic cross-sectional view of the wellhead sealing device shown in FIG. 1 taken along line 2-2 in FIG.

FIG. 3 is an enlarged vertical sectional view of an essential part of the wellhead sealing device shown in FIG.

FIG. 4 is a perspective view of a main part of the wellhead sealing device shown in FIG. 1.

FIG. 5 is a sectional view similar to FIG. 2 of a shaft entrance sealing device for a vertical shaft according to a second embodiment of the present invention.

FIG. 6 is an enlarged vertical sectional view of a main part of the shaft entrance sealing device for the vertical shaft shown in FIG.

[Explanation of symbols]

 13 Wellhead Sealing Device 14 Mounting Plate 15 Elastic Seal Member 16 Swing Plate 17 Axis 18, 18 Bracket 19 Holding Plate 20 Bolt 21 Nut 22 Anchor Member 23 Injection Pipe 24 Second Mounting Plate 25 Second Elastic Seal Member 26 Second Swing Plate 27 Axis 29 Second Holding Plate 30 Bolt 31 Nut

Claims (5)

[Claims] 1. A sealing device for sealing a well hole formed in a well wall of a vertical shaft against the external pressure to start or reach a tunnel excavator, a propulsion pipe, or the like, the outer periphery being fixed to the well hole. Portion and an annular mounting plate having an inner peripheral portion smaller than the wellhead dimension and larger than the outer dimension of the tunnel excavator, an outer peripheral portion attached to the external pressure receiving surface side of the mounting plate, and the outer dimension of the tunnel excavator, etc. An annular elastic seal member having a smaller inner peripheral portion, radially arranged on the rear side of the elastic seal member along the inner peripheral portion of the mounting plate, and elastically pivotably supported by the mounting plate. A well shaft sealing device for a vertical shaft, comprising: a plurality of rocking plates that support the back surface of the sealing member against external pressure. 2. The outer peripheral portion of the elastic seal member is sandwiched between the annular pressure plate and the mounting plate disposed on the external pressure receiving surface side, and is sandwiched by a plurality of bolts and nuts. The shaft entrance sealing device according to claim 1, wherein the device is fastened and fixed to the mounting plate. 3. The shaft according to claim 1, wherein the attachment plate is fixed to one end of a cylindrical anchor member embedded in the pit wall along the inner peripheral surface of the pit. Wellhead sealing device. 4. A wellhead seal for a vertical shaft according to claim 3, wherein said anchor member is fixedly provided with an injection pipe for injecting a wellhead filler on the external pressure receiving surface side of said elastic seal member. apparatus. 5. An annular second mounting plate having an inner peripheral portion smaller than the wellhead dimension and larger than the outer dimension of a tunnel excavator or the like is fixed to the other end of the anchor member so as to face the mounting plate. An annular second elastic seal member having an inner peripheral portion smaller than the outer dimensions of a tunnel excavator or the like is disposed on the back surface of the second mounting plate facing the mounting plate, and the outer periphery of the second elastic seal member. The part is sandwiched between the annular second pressing plate and the second mounting plate arranged on the back surface in a sandwich shape, and is fastened and fixed to the second mounting plate by a plurality of bolts and nuts. A plurality of rocking plates for supporting the back surface of the second elastic seal member against the external pressure is provided on the inner peripheral portion of the second pressing plate.
5. The wellhead sealing device for a vertical shaft according to claim 3, wherein the pressing plate is radially arranged along the entire circumference of the pressing plate and is pivotally supported by the second pressing plate so as to be swingable.