JP2518772B2 - Vertical pit 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 more particularly to a support for supporting the back surface of an elastic seal member against external pressure. Regarding improvement of members.

[0002]

2. Description of the Related Art In a tunnel excavator in a vertical shaft, for starting or reaching a propulsion pipe (fume pipe), etc., excavated earth and sand or groundwater are used for the excavation opening and tunnel excavator or tunnel primary lining segment or propulsion. There is a need for a wellhead sealing device for preventing the inflow into the vertical shaft from the annular gap between the pipe and the outer peripheral surface.

[0003] For example, in the case of a starting hole for a tunnel excavator, a wellhead sealing device is an annular ring between a wellhole opening and a tunnel excavator outer peripheral surface when a tunnel excavator starting from inside a vertical shaft is located inside the wellhole. It is necessary to seal the gap against external pressure and then seal the annular gap between the outer peripheral surface of the segment and the well opening against the external pressure when the segment following the tunnel excavator is located inside the well.

Further, in the case of an access wellhead of a tunnel excavator, an internal pressurizing container having an outer size larger than that of the tunnel excavator is arranged in advance in the wellhead, and the reaching tunnel excavator is received in this container. Is commonly used.
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 includes an annular elastic seal member provided on a well wall at the periphery of the starting wellhead, and a plurality of elastically sealing members provided on the back side of the elastic seal member around the starting wellhead with a space therebetween. And a fixture for fixing the support metal fitting and the elastic seal member to the pit wall, and elastic between the opening of the starting wellhead and the outer peripheral surface of the tunnel excavator or the subsequent tunnel lining material. The elastic sealing member is sealed by a sealing member, and the back side of the elastic sealing member can be supported against external pressure by a plurality of support fittings.

[0006]

However, in the above-described conventional starting shaft entrance sealing device for a vertical shaft, a plurality of support fittings are arranged on the back side of the elastic sealing member at intervals around the starting shaft entrance. Therefore, there is a technical problem that the pressing force of the elastic seal member against the wellhead wall surface becomes weak in the gap between the adjacent support fittings, and the sealing property between the elastic seal member and the starting wellhead wall surface is deteriorated.
Therefore, conventionally, in order to solve this problem, a circular pressing ring is separately interposed between the support fitting and the elastic seal member,
Although the pressing ring is used to press the outer peripheral portion of the elastic seal member against the pit wall surface, the number of parts is increased and the mounting work is complicated.

Therefore, an object of the present invention is to provide a wellhead seal device for a vertical shaft which can improve the sealing property between the elastic seal member and the wellhead mounting surface with a simple structure.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is designed to prevent a tunnel excavator, a propulsion pipe, or the like from starting or reaching, by using a wellhead formed in a well wall of a vertical shaft against external pressure. A sealing device for sealing, comprising an elastic seal member arranged along the periphery of an opening of a wellhead and having a through hole smaller than the outer dimensions of a tunnel excavator, and a back surface of the elastic seal member along the periphery of the opening of the wellhead. A plurality of supporting members disposed on the side to support the back surface of the elastic seal member against external pressure, and a fixing member for fixing the supporting member and the elastic seal member to the wellhead, each of the supporting members being an opening of the wellhead. A fixed plate portion disposed on the rear surface side of the outer peripheral portion of the elastic seal member along the peripheral edge of the elastic seal member, and swingably provided on the fixed plate portion, and a tip end portion of the fixed plate portion abuttable on the outer peripheral surface of the tunnel excavator or the like. At least one rocking plate portion The equipped, to provide a wellhead sealing device intake shaft, characterized in that engaging the ends of the fixing plate portion of the support member adjacent to one another.

In the shaft well sealing device having the above structure, the supporting members adjacent to each other include a convex portion formed at an end portion of one fixed plate portion and a concave portion formed at an end portion of the other fixed plate portion. It is preferably connected to each other by engagement. The shape of the convex portion and the concave portion may be a triangle, a rectangle, a trapezoid, an inverted trapezoid, or a pentagonal or more polygonal shape, but preferably, the convex portion and the concave portion have substantially the same radius r.
And the length of the substantially arc-shaped engaging surface of the convex portion is equal to or longer than the length of the substantially arc-shaped engaging surface of the concave portion.

More preferably, the length of the substantially arcuate engagement surface of the recess is πr or more. Further, in the shaft entrance sealing device of each of the above configurations, the swing plate portion can be swingably connected to the fixed plate portion via the pivot pin or the flexible member. Further, the rocking plate portion and the fixed plate portion can be integrally formed of rubber or a resin having flexibility, or a composite material obtained by reinforcing them with a fiber such as metal or carbon or a thin plate material. In this case, the material composition of the boundary portion between the oscillating plate portion and the fixed plate portion is made different, or the Young's modulus is reduced by reducing or removing the reinforcing fibers and the like in that portion, thereby making the oscillating plate portion fixed plate. The part can be made swingable.

[0011]

[Function] In the shaft entrance sealing device of the above structure,
Since the ends of the fixed plate portions of the support members adjacent to each other are engaged with each other, it is possible to prevent the pressing force of the elastic seal member from being reduced between the ends of the fixed plate portions of the adjacent support members. Therefore, the sealability between the elastic seal member and the wellhead mounting surface can be enhanced without the need for a separate pressing ring or the like.

When adjacent support members are connected to each other by the engagement of the convex portion formed at the end portion of one fixed plate portion and the concave portion formed at the end portion of the other fixed plate portion, in particular, the wellhead. It is possible to reliably prevent the seal leakage in the radial direction from the center of the.

The convex portion and the concave portion have substantially arc-shaped engaging surfaces having substantially the same radius r, and the length of the substantially arc-shaped engaging surface of the convex portion is equal to or longer than the length of the substantially arc-shaped engaging surface of the concave portion. In this case, the supporting members adjacent to each other should shift the relative position of the fixed plate portion along the substantially arc-shaped engaging surface while maintaining the engagement state of the substantially arc-shaped convex portion and the substantially arc-shaped concave portion. Therefore, even when the support member is applied to a wellhead having a different size or shape, the fixed plate portions of the support members adjacent to each other can be kept connected. Therefore, it is possible to provide a well-versed wellhead well seal device which is applicable to wellheads having different sizes and shapes and which can enhance the sealing property between the elastic seal member and the wellhead mounting surface.

Furthermore, the length of the substantially arcuate engagement surface of the recess is π.
When it is made larger than r, the substantially arcuate concave portion can hold the substantially arcuate convex portion so as to be rotatable around the arc center, so that the fixed plate portions of the consecutively provided supporting members are made into a chain shape. Links can be combined.

[0015]

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, the starting hole, ie, the starting hole 2 formed in the shaft wall of the vertical shaft has a number 10 as a whole.
A wellhead sealing device shown by is provided. The wellhead seal device 10 includes an annular elastic seal member 11 for sealing an annular gap that may occur at the opening of the wellhead 2 and a support member 12 for supporting the back surface of the elastic seal member 11 against external pressure. It has and.

As shown in FIG. 1, the elastic seal member 11 made of rubber or the like has a circular through hole 13 having a diameter smaller than the outer dimension of the segment 3 indicated by an imaginary line. The hole 13 is attached to the wellhead 2 by the method described later so that the hole 13 is concentric with the opening of the wellhead 2. It should be noted that the tunnel excavator 4 has a larger outer dimension than the segment 3, as indicated by a phantom line in FIG. 1.

The support member 12 is provided on the rear side of the outer peripheral portion of the elastic seal member 11 with a plurality of fixed plate portions 14 arranged in the opening of the wellhead 2 and swingably provided on each fixed plate portion 14. And a rocking plate portion 15. The fixing plate portion 14 and the elastic seal member 11 are fixed to the well wall of the wellhead 2 by means of a fixing bolt, for example, a stud bolt 16 provided on the peripheral edge portion of the wellhole 2 and a nut 17 screwed onto the bolt 16.

The structure of the support member 12 will be described in more detail. In this embodiment, the rocking plate portions 15 made of, for example, metal or fiber reinforced resin are fixed plate portions 1 made of the same material.
4 is connected via a pivot pin 18 so as to be swingable.

As shown in FIG. 4, the oscillating plate portion 15 is dimensioned so that its tip can abut the outer peripheral surface of the tunnel excavator 4 or the segment 3 in an inclined state. Therefore, when the rocking plate portion 15 is in contact with the outer peripheral surface of the tunnel excavator 4 or the segment 3, the elastic seal member 1
1, the inner peripheral edge of which is in close contact with the outer peripheral surface of the tunnel excavator 4 or the segment 3, and the rear surface thereof is firmly supported by the rocking plate portion 15 against external pressure such as earth pressure and water pressure. It is possible to perform various seals.

Further, in this embodiment, as shown in FIGS. 2 and 3, the rocking plate portion 15 is provided with a stopper 19 for restricting the rocking angle thereof. The stopper 19 contacts the back surface of the fixed plate portion 14 at a position where the swing plate portion 15 forms an acute angle θ with respect to the horizontal cross section (cross section perpendicular to the axis) of the wellhead opening. Therefore, even when the tunnel excavator 4 and the segment 3 are excessively eccentric with respect to the opening of the wellhead 2, the rocking plate portion 1
It is possible to reliably prevent 5 from taking a position (θ = 0 °) along the cross section of the wellhead opening, that is, a so-called dead center position. Therefore, even when the excessively eccentric tunnel excavator 4 or the segment 3 returns toward the opening center of the wellhead 2, the rocking plate portion 15 surely shakes in accordance with the movement of the tunnel excavator 4 or the segment 3. It can be dynamically displaced. It should be noted that restricting the swing angle of the swing plate portion 15 as described above is only a preferred embodiment, and as a stopper, the swing range of the swing plate portion 15 is set to a position perpendicular to the axis of the wellhead 2. The stopper may be omitted, or the stopper may be omitted.

Next, the structure that characterizes the present invention will be described. As for the supporting members 12 adjacent to each other, the convex portion 20 formed at the end of one fixing plate portion 14 and the end of the other fixing plate portion 14 are formed. They are connected to each other by engaging with the recesses 21 formed in the parts. The convex portion 20 and the concave portion 21 have substantially arc-shaped engaging surfaces having substantially the same radius r, and the length of the substantially arc-shaped engaging surface of the convex portion 20 is equal to or longer than the length of the substantially arc-shaped engaging surface of the concave portion 21. Is. More specifically, the arc of the convex portion 20 is the fixed plate portion 14
Is a 180 ° arc whose width is the diameter (2r).

In the shaft entrance sealing device having the above structure, the support members 12 adjacent to each other are fixed plate portions 14 on one side.
Since they are connected to each other by the engagement of the substantially arcuate convex portion 20 formed at the end portion of and the substantially arcuate concave portion 21 formed at the end portion of the other fixing plate portion 14, they are connected in the circumferential direction. The outer peripheral portion of the elastic seal member 11 can be pressed against the mounting surface of the wellhead 2 by a plurality of continuous fixing plate portions. Therefore, the sealability between the elastic seal member 11 and the mounting surface of the wellhead 2 can be enhanced without the need for a separate annular pressing ring or the like.

Further, the supporting members 12 adjacent to each other are fixed plate portions 14 along the substantially arcuate engagement surface while keeping the engagement state of the substantially arcuate projection 20 and the substantially arcuate recess 21. ，
Since the relative position of 14 can be shifted, the support member 1
Even when 2 is applied to the wellhead 2 having a different size or shape, the fixed plate portions 14 of the support members 12 adjacent to each other can be kept in the connected state. Therefore, it becomes a well-versed wellhead seal device that can be applied to wellheads 2 having different sizes and shapes and can enhance the sealing property between the elastic seal member 11 and the mounting surface of the wellhead 2.

FIG. 5 shows a second embodiment of the present invention in which the support member 12 is modified. First in the figure
The same components as those in the embodiment are designated by the same reference numerals. In this embodiment, the swing plate portion 15 is swingably connected to the fixed plate portion 14 via the flexible connecting member 22. That is, when the flexible member 22 is bent and deformed, the swing plate portion 15 can swing with respect to the fixed plate portion 14. Further, in this embodiment, the fixed plate portion 14 is formed with the stopper portion 23 that can come into contact with the end surface of the swing plate portion 15, and since the stopper portion 23 has the inclination angle, The swing of the plate portion 15 is restricted at a position forming an acute angle θ with respect to the wellhead opening cross section passing through the swing center. Also in this embodiment, the shape of the end portion of the fixing plate portion 14 can be the same as that of the first embodiment, so that the same effect as that of the first embodiment can be obtained.

Further, the fixed plate portion 14 and the oscillating plate portion 15 may be integrally formed of rubber or a resin having flexibility, or a composite material in which these are reinforced with a fiber such as metal or carbon or a thin plate material. it can. In this case, the material composition of the boundary portion between the oscillating plate portion and the fixed plate portion is made different, or the Young's modulus is reduced by reducing or removing the reinforcing fibers and the like in that portion, thereby making the oscillating plate portion fixed plate. The part can be made swingable.

FIG. 6 shows a third embodiment of the present invention in which the fixed plate portion 14 and the oscillating plate portion 15 of the support member 12 are integrally molded with rubber 23 reinforced with mesh-shaped fibers 24. Since the reinforcing fiber 24 is removed at the boundary portion 25 between the fixed plate portion 14 and the oscillating plate portion 15, the Young's modulus of the portion is small, and the oscillating plate portion 15 is fixed to the fixed plate portion 14.
On the other hand, it is swingable around the boundary portion.
Also in this embodiment, the shape of the end portion of the fixing plate portion 14 can be the same as that of the first embodiment, so that the same effect as that of the first embodiment can be obtained.

FIG. 7 shows a fourth embodiment of the present invention in which the support member 12 is modified. In this embodiment, a plurality of, for example, two swing plate portions 15 are swingably provided on one fixed plate portion 14. Here, the fixed plate portion 14 extends linearly and the two rocking plate portions 15 are attached in parallel to each other, but the fixed plate portion 14 is formed in an arc shape,
The two rocking plate portions 15 may be arranged in the radial direction with respect to the center of the arc. When a plurality of rocking plate portions 15 are provided for one fixed plate portion 14, the support member 12 can be easily handled and the number of fixed members can be reduced to improve the workability of assembling into the wellhead 2. It will be possible to improve.

FIG. 8 shows a fifth embodiment of the present invention in which the support member 12 is modified. In this embodiment, the convex portion 20 and the concave portion 21 have substantially arc-shaped engaging surfaces having substantially the same radius r, the length of the substantially arc-shaped engaging surface of the concave portion 21 is larger than πr, and the convex portion 20 has a substantially circular shape. The length of the arcuate engagement surface is equal to or greater than the length of the substantially arcuate engagement surface of the recess 21. In the case of this embodiment, since the substantially arc-shaped concave portion 21 can hold the substantially arc-shaped convex portion 20 rotatably around the circular arc center, the fixed plate portions 14 of the supporting members 12 that are continuously provided are adjacent to each other. Can be firmly linked together.

9 and 10 show a sixth embodiment of the present invention in which the support member 12 is modified. In this embodiment, the end portions of the fixed plate portions 14 of the support members 12 adjacent to each other overlap each other in the plate thickness direction, and the end portions of one fixed plate portion 14 are formed at the end portions of the other fixed plate portion 14. Since the stepped portion 26 is abutted and engaged, it is possible to prevent the pressing force of the elastic seal member 11 from being reduced between the fixing plate portions 14 of the adjacent support members 12. Further, in this embodiment, the pin-shaped convex portion 20 provided at the end portion of the one fixing plate portion 14 at the overlapping portion of the end portions has the other fixing plate portion 1.
4 is fitted into a hole-shaped concave portion 21 formed at the end portion.
Therefore, the fixed plate portions 14 of the support members 12 that are continuously provided can be linked together in a chain shape.

Although the illustrated embodiment has been described above, the present invention is not limited to the embodiment of the above embodiment,
Various modifications can be made to the constituent elements within the scope of the invention described in the claims. For example, the illustrated connection forms between the fixed plate portion and the oscillating plate portion and the respective engagement forms at the end portions of the fixed plate portion can be appropriately combined. The shape of the wellhead is not limited to a circular shape or a substantially circular shape, and the shape of the elastic seal member, the shape of the support member, and the like can be changed according to the shape of the wellhead. Further, the wellhead sealing 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. .

[0032]

As is apparent from the above description, according to the present invention, the ends of the fixing plate portions of the supporting members adjacent to each other are engaged with each other, so that the elastic seal member and the wellhead mounting surface are connected. It is possible to provide a wellhead seal device for a vertical shaft that can improve the sealing property between the shafts.

[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.

FIG. 2 is an enlarged front view of a main part of the wellhead sealing device shown in FIG.

FIG. 3 is an enlarged vertical sectional view of a main part of the wellhead seal device shown in FIG.

FIG. 4 is a view similar to FIG. 3 showing a usage state of the wellhead seal device shown in FIG. 1.

FIG. 5 is an enlarged vertical cross-sectional view of a main part of a wellhead sealing device showing a second embodiment of the present invention in which a supporting member is changed.

FIG. 6 is an enlarged vertical cross-sectional view of a main part of a wellhead sealing device showing a third embodiment of the present invention in which a supporting member is changed.

FIG. 7 is an enlarged front view of a main part of a wellhead sealing device showing a fourth embodiment of the present invention in which a supporting member is changed.

FIG. 8 is an enlarged front view of a main part of a wellhead sealing device showing a fifth embodiment of the present invention in which a supporting member is changed.

FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 10 of a wellhead sealing device showing a sixth embodiment of the present invention in which a supporting member is changed.

FIG. 10 is an enlarged front view of a main part of the wellhead sealing device shown in FIG. 9.

[Explanation of symbols]

 10 Wellhead Sealing Device 11 Elastic Seal Member 12 Support Member 14 Fixed Plate Part 15 Swing Plate Part 18 Pivot Pin 20 Convex Part 21 Recessed Part

Claims (4)

(57) [Claims] 1. A sealing device for sealing a wellhead 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, along a periphery of an opening portion of the wellhead. An elastic seal member having a through hole smaller than the outer dimensions of a tunnel excavator and the like, and arranged on the back surface side of the elastic seal member along the periphery of the opening of the wellhead, and the back surface of the elastic seal member against external pressure. A plurality of supporting members for supporting and a fixing member for fixing the supporting member and the elastic seal member to the wellhead are provided, and each of the support members is arranged along the peripheral edge of the opening of the wellhole on the rear surface side of the outer periphery of the elastic seal member. And a fixed plate portion that is swingably provided on the fixed plate portion, and has at least one swing plate portion whose tip portion is formed so as to be able to contact an outer peripheral surface of a tunnel excavator or the like, and are adjacent to each other. Ends of the fixed plate of the support member A wellhead sealing device for a vertical shaft, characterized in that 2. The supporting members adjacent to each other are connected to each other by engagement of a convex portion formed at an end portion of one fixed plate portion and a concave portion formed at an end portion of the other fixed plate portion. The wellhead sealing device for a vertical shaft according to claim 1, wherein 3. The convex portion and the concave portion have a substantially arc-shaped engaging surface of substantially the same radius r, and the length of the substantially arc-shaped engaging surface of the convex portion is a substantially arc-shaped engaging surface of the concave portion. 3. The vertical wellhead sealing device according to claim 2, wherein the length is equal to or greater than the length. 4. The length of the substantially arcuate engagement surface of the recess is πr.
The wellhead sealing device for a vertical shaft according to claim 2, which is larger.