JP2592299B2 - Opening sealing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sealing device used for a tunnel excavation method, a press-fit type pipe propulsion method, and the like, and particularly to a shaft shaft for constructing a tunnel or laying a pipeline. The present invention relates to a sealing device arranged to seal between a hollow body such as a shield machine, a propulsion pipe, and a lining received in a launching or reaching opening formed in a wellhead wall and the wellhead wall.

(Conventional technology) In a digging method for constructing a tunnel or laying a pipeline using a shield type tunnel digging machine, a pit wall having an opening such as a starting port or an arrival port for excavated earth and ground water and a digging machine. Sealing devices are placed on the wellhead wall to prevent it from flowing into the shaft from between the wellhead and the lining following the machine. This type of sealing device is also provided in a pipe propulsion method in which a propulsion pipe is pressed into a ground from a shaft, so as to seal the space between the propulsion pipe and the pit wall.

FIGS. 21 and 22 show one such sealing device.
There is a sealing device 10 shown in the figure. The sealing device 10 includes an annular sealing member 16 having a circular hole 14 having a diameter smaller than the outer diameter of the shield tunneling machine 12, and a plurality of metal fittings 18 formed of a rectangular metal plate.

The sealing material 16 has an axis of the circular hole 14 and a shaft wall 20 of the shaft.
The anchor bolt 24 and a nut 26 screwed to the anchor bolt 24 are attached to the pit wall 20 so as to coincide with the axis of the starting opening 22 formed in the shaft. Each metal fitting 18 has a long hole 28, and an anchor bolt 24 and a nut 26 penetrating the long hole 28 so as to be at equal angular intervals around the opening 22.
It is attached to the wellhead wall 20.

At the time of propulsion of the excavator, as shown by a two-dot chain line in FIG. 20, the sealing material 16 is bent forward by the excavator 12 in the propulsion direction thereof, and a portion around the circular hole 14 of the sealing material 16, that is, an inner peripheral edge portion. Abuts on the outer peripheral surface of the machine 12 due to the elasticity of the seal material 16 itself. As a result, the space between the pit wall 20 and the excavator 12 is sealed, and the inflow of excavated matter, groundwater, and the like from the opening 22 into the shaft is prevented.

As the excavator 12 is further propelled, the inner perimeter of the seal 16 abuts against the outer perimeter of the lining, such as the lining segment that follows the excavator 12. Incidentally, a large earth pressure due to excavated earth and sand, groundwater, etc. acts on the sealing material 16. The outer diameter of the lining is smaller than that of the excavator 12, and the contact area between the sealing material 16 and the lining is smaller than that of the sealing material 16 and the excavating machine 12. Therefore, when the sealing material 16 comes into contact with the lining, each metal fitting 18 is moved toward the lining until the tip of the metal fitting 18 contacts the outer peripheral surface of the lining. Thereby, each metal fitting 18 supports the sealing material 16 on the back surface thereof so that the sealing material 16 can maintain the bent state and resist the soil water pressure.

(Problems to be Solved by the Invention) However, since the movement of the metal fittings 18 is performed by beating them all at once, not only a large number of people are required but also the metal fittings are required.
If a time delay occurs during the movement of the 18, the sealing of the opening 22 may be incomplete.

Therefore, an object of the present invention is to provide a sealing device that can reliably seal between a member defining an opening and a hollow body.

(Means for Solving the Problems) A seal device of the present invention is an elastically deformable seal material having a hole capable of receiving a hollow body, and an expandable body that can be expanded by a fluid, and is expanded. An expansion body for pressing at least a portion of the sealing material around the hole against the outer peripheral surface of the hollow body, and a fixture for fixing the expansion body and the sealing material to the downhole wall are included.

In one embodiment of the present invention, the sealing material includes an elastically deformable annular plate having the hole. In the case of this sealing device, the inflatable body is attached to the attachment so as to extend along a virtual annular line around the hole in front of the plate with respect to the direction of propulsion of the hollow body. . In addition, the fixture fixes the plate to the pit wall such that a portion around the hole of the plate is elastically deformed by the hollow body into the inflatable body. Thereby, when the plate member is deformed and the expandable member is expanded, the expandable member obtains a reaction force from the mounting fixture and presses the portion of the plate member toward the outer peripheral surface of the hollow body. .

In another embodiment of the present invention, the sealing material includes an elastically deformable annular plate having the hole. In the case of this sealing device, the inflatable body is attached to the plate so as to extend along a virtual annular line around the hole at the front of the plate with respect to the propulsion direction of the hollow body. In addition, the fixture fixes the plate to the pit wall such that a portion around the hole of the plate is elastically deformed by the hollow body into the inflatable body. Thereby, when the plate member is deformed and the expandable member is expanded, the expandable member obtains a reaction force from the mounting fixture and presses the portion of the plate member toward the outer peripheral surface of the hollow body. .

In still another embodiment of the present invention, the inflatable body is attached to the fixture so as to extend along a virtual annular line around the hole, and the sealant is disposed on an inner surface of the inflatable body. ing. In the case of this sealing device, a plurality of elastic members attached to the attachment so as to protrude toward the center of the inflatable body behind the inflatable body in the propulsion direction of the hollow body, It is preferable to further include a plurality of elastic members arranged along the expansion body.

In an embodiment of the present invention, the inflatable body includes an annular tube extending along a virtual line around the hole, or a plurality of tubes extending along a virtual line around the hole. Is preferred. When the expansion body includes a plurality of tubes, the adjacent tubes may or may not be connected to each other.

In the case of using an inflatable body including an annular tube or a plurality of tubes arranged in an annular shape, the attachment includes an annular fixing portion that fixes a portion of the seal material outside a portion of the inflatable body; It is preferable that the seal member has a concave portion that opens on the side of the central axis of the seal member so as to receive the tube when the material is deformed, and has an annular concave portion that extends along the fixing portion.

(Operation and Effect of the Invention) During excavation, a working fluid having a predetermined pressure, such as a gas or a liquid, is supplied to the expansion body, and the expansion body is expanded. Thereby, until the excavator passes the position of the seal material, the seal material is strongly pressed against the outer peripheral surface of the excavator by the expandable body,
A liquid-tight seal is provided between the member defining the opening and the excavator received in the opening.

As the excavator is propelled, when the excavator passes the position of the seal material, the seal material is strongly pressed against the outer surface of the lining following the excavator, and a liquid is formed between the member defining the opening and the lining. Tightly sealed.

When the hollow body is a propulsion tube, the inflatable body expands during excavation and strongly presses the sealant against the outer peripheral surface of the propulsion tube. This provides a liquid-tight seal between the member defining the opening and the excavator received in the opening.

Therefore, according to the sealing device of the present invention, the space between the member defining the opening and the hollow body can be reliably sealed.

According to the sealing device of claims (2) to (4), since the inflatable body obtains a reaction force on the fixture, the space between the member defining the opening and the hollow body is more securely sealed.

According to the sealing device of claim (5), the elastic member is bent forward by the movable hollow body in the traveling direction of the movable member, whereby a part of the elastic member is disposed between the sealing member and the hollow member. Therefore, abrasion and breakage of the sealing material due to movement of the hollow body with respect to the sealing material are prevented.

According to the sealing device of claim (6), the tube is expanded so as to tighten the sealing material, whereby the sealing material is pressed by the excavator and the lining over the entire outer peripheral direction of the hollow body.

According to the sealing device of claim (7), the sealing material is pressed by the hollow body over the entire outer peripheral direction of the hollow body by each tube.

According to the sealing device of claim (8), since each tube is expanded so as to tighten the sealing material, the sealing material is pressed against the hollow body over the entire outer peripheral direction of the hollow body.

According to the sealing device of claim (9), the expansion direction of the tube is regulated by the recess of the fitting in the direction of the central axis of the opening, that is, in the direction of tightening the sealing material.

(Example) Hereinafter, an example of the present invention shown in the drawings will be described.

The seal device 30 shown in FIGS. 1 to 4 is applied to an access opening 38 formed in a shaft wall 36 of an access shaft 34 for a shield tunnel excavator 32. The opening 38 has a circular cross-sectional shape in the illustrated example, but may have another cross-sectional shape such as a polygon, a cocoon, an oval, an ellipse, or an eyeglass shape.

The excavator 32 includes a cylindrical shield main body, and a cutter assembly that is rotatably arranged at the front of the main body around an axis of the main body, and is advanced while excavating a face by the cutter assembly. Known device. The excavator 32 may be propelled by a plurality of jacks (not shown) that obtain a reaction force on a lining (not shown) disposed behind the excavator 32, or may be driven by a main pusher disposed in a starting shaft. It may be performed through the lining by an apparatus (not shown).

The lining includes a segment ring obtained by assembling a plurality of lining segments on an excavation site by the excavator 32, a lining wall constructed of cast-in-place concrete placed on the excavation site, It consists of a pipe or the like pushed into the excavation site by the device.

The seal device 30 includes an annular seal member 40 made of a plate material such as an elastic rubber plate. Sealing material 40 is an excavator
It has an outer diameter larger than the outer diameter of the 32 shield bodies. A hole 42 having a diameter smaller than the outer diameter of the shield body is formed in the center of the seal member 40. As shown in FIGS. 3 and 4, the sealing member 40 has an annular pressing plate 44 and a plurality of bolts 46 at its outer peripheral edge.
And a plurality of nuts 48 to fix to the annular fixture 50. The holding plate 44 extends along the outer peripheral edge of the sealing material 40.

The attachment 50 includes a short cylindrical portion 52 having an inner diameter approximately the same as the inner diameter of the opening 38, an outward first flange portion 54 extending outward from one end of the cylindrical portion 52, and a cylindrical portion 52. A second inward flange portion 56 extending inward from the other end of the second member 52, and an inward third flange extending between the first and second flange portions 54, 56 and extending inward from the cylindrical portion 52. And a portion 58.

The first flange portion 54 has a diameter larger than the diameter of the opening 38. Second and third flange portions 56, 58
Has an inner diameter larger than the outer diameter of the shield main body, and has an outer diameter substantially the same as the outer diameter of the sealing material 40. The seal member 40 has a center axis of the hole 42 on a surface of the third flange portion 48 on a side opposite to the second flange portion 46.
Fixed to match that of 50. In addition, sealing material
The outer diameter of 40 may be smaller than that of the second and third flanges 56,58.

The cylindrical portion 52 of the fixture 50 and the second and third flange portions 5
6,58 defines an annular recess 60 that opens inward. An annular inflatable body 62 is accommodated in the recess 60. Inflatable body 62
Is a gas, liquid,
It is made of a member that can be expanded by a working fluid such as a slurry, and is fixed to the fixture 50 with a hook-and-loop fastener, an adhesive, a screw, or the like.

The expansion body 62 has a working fluid supply / discharge port 64, and the supply / discharge port 64
In the example shown in the figure, penetrates the cylindrical portion 52 of the fixture 50 to the outside thereof. The supply / discharge port 64 acts as a supply / discharge port when the discharge of the working fluid is required. However, when a curable slurry such as mortar is used as a working fluid, it works only as a supply port.

In the illustrated example, the inflatable body 62 is an annular tube. Alternatively, a plurality of tubes or bags arranged in the recess 60 along the recess may be used. In this case, it is preferable to connect adjacent tubes or bags to each other.

Rubber material for tubes and bags as inflatables 62,
In addition, the rubber material as the sealing material 40 is preferably a proloprene-based rubber material, and particularly preferably a proloprene-based rubber material reinforced with fibers.

The seal device 30 includes anchor bolts 66 provided on the pit wall 36 at a plurality of locations of the first flange portion 54 of the fixture 50.
And the nut 68 screwed into the hole, the hole of the sealing material 40 is formed.
The wellbore 36 is positioned such that the axis of 42 coincides with that of the opening 38 and that the inflatable body 62 is in front of the sealing material 40 in the propulsion direction of the machine 32.
Fixed to

As shown in FIG. 3, the expansion body 62 is contracted until the excavator 32 reaches the position of the sealing material 40. Drilling machine 32
Is propelled from the position shown in FIG. 3, as shown in FIG. 4, a portion around the hole 42 of the sealing material 40, that is, an inner peripheral portion is pushed and bent forward by the excavator 32 in the propulsion direction of the excavator. Can be

When the inner peripheral edge of the seal member 40 is bent, the high-pressure working fluid is supplied to the supply / discharge port 64 of the expansion body 62. As a result, the expansion body 62 is expanded, and the inner peripheral edge of the expansion body 62 is
Protruding from. As a result, the inner peripheral edge of the seal member 40 is pressed against the outer peripheral surface of the shield main body by the expansion body 62 to seal the gap between the shield main body and the downhole wall 36.

The expansion body 62 is maintained in an expanded state by the working fluid until the excavation by the excavator 32 is completed thereafter. To maintain the expanded body 62 in the expanded state, the working fluid may be constantly supplied to the expanded body 62, or the working fluid may be supplied to the expanded body 62 until the expanded body expands to a predetermined state. After doing
The supply / discharge port 64 may be closed. In the latter case, it is preferable to arrange a valve and a pressure gauge at the supply / discharge port 64.

The direction in which the expansion body 62 expands depends on the member 6 defining the recess 60.
Regulated by 2,66,68. That is, the expansion body 62 expands mainly toward the excavator 32, and obtains a reaction force from the attachment 50 and presses the inner peripheral edge of the seal member 40 toward the shield body. As a result, the inner peripheral edge of the seal member 40 is reliably pressed against the outer peripheral surface of the shield main body, thereby sealing the gap between the shield main body and the downhole wall 36 in a liquid-tight manner.

When the excavator 32 is moved forward from the position of the seal material 40, the inner peripheral edge of the seal material 40 is pressed by the expansion body 62 against the outer peripheral surface of the lining following the excavator 32, and Seal between wall 36.

The seal device 30 may be removed from the pit wall 34 after excavation is completed. However, after excavation by the excavator 32, the expansion body 62
And injecting a curable fluid such as mortar into the inflatable body 62 to expand the inflatable body 62 and cure the fluid, or use a curable fluid as a working fluid from the beginning and cure it. Then, the state where the expansion body 62 is expanded can be maintained. Further, the expansion body 62 may be expanded in advance.

According to the seal device 30, since the inflatable body 62 is an annular tube, the inflatable body 62 is inflated so as to tighten the seal member 40, whereby the seal member 40 is shielded over the entire outer circumferential direction of the shield body and the lining. Pressed by body and lining.

Referring to FIGS. 5 to 8, an opening formed in a shaft wall 36 of a reaching shaft 34 for a shield tunnel machine 32.
Another sealing device 70 applied to 38 is shown. The sealing device 70 basically includes the same components as those in the sealing device 30, namely, the sealing material 40, the holding plate 44, and the bolt 4
6, including the nut 48, the fixture 50, and the expansion body 72.

The holding plate 44, the bolt 46, the nut 48, and the fixture 50 are the same as those in the sealing device 30. The inflatable body 72 has a structure similar to that of the seal device 30, but is attached to the inner peripheral edge of the seal member 40 and on the surface on the front side in the traveling direction of the excavator 32, with a surface fastener, an adhesive or the like. I have. The supply / discharge port 74 for the working fluid is disposed inside the expansion body 72.

In the sealing device 70, the anchor bolt 66 and the nut 68 allow the axis of the hole 42 of the sealing material 40 to coincide with the opening 38 at a plurality of locations of the first flange portion 54 of the fixture 50, and the inflating body 72 The excavator 32 is fixed to the shaft wall 36 so as to be located forward of the excavator 32 with respect to the direction 40.

As shown in FIG. 7, the expansion body 72 is contracted until the excavator 32 reaches the position of the sealing material 40. Drilling machine 32
7 is propelled from the position shown in FIG. 7, as shown in FIG. 8, the portion around the hole 42 of the sealing material 40, that is, the inner peripheral portion is pushed forward by the excavator 32 in the propulsion direction of the excavator. As a result, the expansion body 72 is received in the recess 60 of the fixture 50. Also in the case of the sealing device 70, the expansion body 72 may be expanded in advance.

When the inflatable body 72 is received in the recess 60, a high-pressure working fluid is supplied to the inflatable body 72, and the inflatable body 72 is inflated. Pressed against the surface. As a result, the space between the shield body and the pit wall 36 is sealed. When the excavator 32 is moved forward from the position of the seal material 40, the inner peripheral edge of the seal material 40 is pressed against the outer peripheral surface of the lining following the excavator 32, and the Seal the gap.

9 to 12 show still another sealing device 76 applied to the opening 38 formed in the shaft wall 36 of the reaching shaft 34 for the shield tunnel excavator 32. The sealing device 76 includes a fixture 50, an inflatable body 62, an endless belt-shaped sealing member 78 made of an elastic material such as rubber, and a plurality of cushioning members 80 made of an elastic material.

The fitting 50 and the inflatable body 62 are the same as those in the sealing device 30. The seal member 78 is attached to the inner peripheral surface of the expansion body 62 with a hook-and-loop fastener, an adhesive, or the like so as to form a hole 82 for receiving the excavator 32 with the seal member. In the illustrated example, each cushioning member 80 is formed of a rectangular thin elastic plate, and has an annular holding plate 83, a bolt 84, and a nut.
85, it is attached to the third flange 58 of the fixture 50 at equal angular intervals. The holding plate 83 extends along the third flange portion 58.

Instead of the plate-like cushioning material 80, a linear cushioning material 88 such as a metal wire such as a piano wire, a monofilament made of synthetic resin, or the like is used as in a sealing device 86 shown in FIGS. 13 and 14.
May be used. Further, instead of using the holding plate 83, the bolt 84 and the nut 85, the cushioning members 80 and 88 may be attached to the third flange portion 58 by welding. Further, instead of the endless belt-shaped sealing material 78, a plurality of sealing material small pieces may be adhered to the inner surface of the expansion body 62, and these may be used as the sealing material.

The seal device 76 has a structure in which the axis of the hole 82 of the sealing material 78 coincides with that of the opening 38 by the anchor bolt 66 and the nut 68 at a plurality of locations of the first flange 54 The material 78 is fixed to the shaft wall 36 so as to be ahead of the cushioning material 80 in the propulsion direction of the excavator 32.

As shown in FIG. 11, the expansion body 62 is contracted until the excavator 32 reaches the position of the sealing material 78. Drilling machine 32
Is moved to the position of the sealing material 78 as shown in FIG. 12, the cushioning material 80 is pushed and bent by the excavator 32 in the forward direction of the excavator.

When the cushioning material 80 is bent, the working fluid is supplied to the expansion body 62. Thereby, since the expansion body 62 is expanded,
The inner peripheral surface of the seal member 78 is pressed against the outer peripheral surface of the shield main body by the expansion body 62 via the cushioning material 80. As a result, the space between the shield body and the pit wall 36 is sealed. When the excavator 32 is moved forward from the position of the seal material 78, the inner peripheral surface of the seal material 78 is pressed through the cushioning material 80 against the outer peripheral surface of the lining that is behind the excavator 32, and And the pit wall 36 are sealed.

According to the sealing device 76, when used, the sealing material 78 is
The seal material is pressed against the outer peripheral surface of the shield body or the lining via 80, so that the seal material 78 is worn or damaged by the movement of the shield body with respect to the seal material 78, and the seal material when the lining is propelled together with the shield body. The abrasion and breakage of the sealing material 78 due to the movement of the lining with respect to 78 are prevented.

Referring to FIGS. 15-18, there is shown a seal device 96 applied to a launch opening 94 formed in a pit wall 92 of a launch shaft 90 for a shielded tunnel machine 32. The sealing device 96 has basically the same components as those in the sealing device 30, namely, the sealing material 40, the holding plate 44, the bolt
46, a nut 48, an inflatable body 62 and a fixture 98.

The sealing member 40, the holding plate 44, the bolt 46, the nut 48, and the expansion body 62 are the same as those in the sealing device 30. The attachment 98 is the same as the attachment 50 of the sealing device 30 except that the first flange 54 is provided at the end of the cylindrical member 52 on the side of the second flange 56. .

In the sealing device 96, the anchor bolt 66 and the nut 68 make the axis of the hole 42 of the sealing material 40 coincide with that of the opening 38, and the inflatable body 62 The hole 42 of the material 40 is fixed to the wellhead wall 92 such that the axis of the hole 42 coincides with that of the opening 38 and the inflatable body 62 is located forward of the sealing material 40 in the propulsion direction of the machine 32.

As shown in FIG. 17, the expansion body 62 is contracted until the excavator 32 reaches the position of the sealing material 40. Drilling machine 32
When is propelled from the position shown in FIG. 17, the inner peripheral portion around the hole 42 of the sealing material 40 is pushed and bent forward by the excavator 32 in the propulsion direction of the excavator as shown in FIG.

When the sealing material 40 is bent, a high-pressure working fluid is supplied to the expansion body 62, and the expansion body 62 is expanded, so that the inner peripheral edge of the sealing material 40 is pressed against the outer peripheral surface of the shield body by the expansion body 62. You. As a result, the space between the shield body and the pit wall 92 is sealed. When the excavator 32 is moved forward from the position of the sealing material 40, the inner peripheral edge of the sealing material 40 is pressed against the outer peripheral surface of the lining following the excavator 32, and the Seal the gap. Also in the case of the sealing device 96, the expansion body 62 may be expanded in advance.

The sealing device 70 shown in FIGS. 5 to 8, the sealing device 76 shown in FIGS. 9 to 12, and the sealing device 77 shown in FIGS. 13 to 14 also have the first flange portion 54 of the fixture 50. Is provided on the side of the second flange portion 56, a sealing device applied to the starting opening 94 can be obtained.

As shown in FIG. 19, one of the seal devices 30, 70, 76, 86, and 96 may be provided with ribs 100, 102, and 104 on the fixture 50 and the holding plate 44. As shown in FIG. 20, a modified example of the attachment 50 is such that the cylindrical portion 52 is replaced with a third flange 58 instead of providing the first flange 54 of the attachment 50, 98.
The extension 106 may be further extended and fixed to the inner peripheral surface of the pit wall 36 defining the hole 38 with a bolt, a nut, or the like.

Each of the above sealing devices 30, 70, 76, 86, 96 can be used not only for the excavation method for constructing a tunnel using the shield tunnel excavator 32 or for laying a pipeline, but also for laying a pipeline by a pipe propulsion method. Can also be applied. In addition, each sealing device
30,70,76,86,96 sealing materials 40,72, holes 42,82, fittings 50,9
8, the recess 60 and the expansion bodies 62 and 72 are circular in the illustrated example, but when the opening or the hollow body has another shape, they are polygonal, eyebrow-shaped, or long according to the shape. Other shapes, such as a circle, an ellipse, and a spectacle shape.

[Brief description of the drawings]

1 to 4 are views showing an embodiment of the sealing device of the present invention applied to a reaching opening, wherein FIG. 1 is a longitudinal sectional view, FIG. 2 is a left side view, and FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 2, and FIG. 4 is a sectional view similar to FIG. 3 when the expandable body is expanded. 5 to 8 are views showing another embodiment of the sealing device of the present invention applied to the reaching opening, wherein FIG. 5 is a longitudinal sectional view, FIG. 6 is a left side view, and FIG. The figure is an enlarged sectional view taken along line 7-7 in FIG. 6, and FIG. 8 is a sectional view similar to FIG. 7 when the inflatable body is expanded. 9 to 12 are views showing still another embodiment of the sealing device of the present invention applied to the arrival opening, wherein FIG. 9 is a longitudinal sectional view, FIG. 10 is a right side view, and FIG. FIG. 11 is an enlarged sectional view taken along line 11-11 of FIG. 10, and FIG. 12 is a sectional view similar to FIG. 11 when the expandable body is expanded.
13 and 14 are views showing still another embodiment of the sealing device of the present invention applied to the arrival opening, and FIG.
The figure is a longitudinal sectional view, and FIG. 14 is a right side view. 15 and 18 are views showing an embodiment of the sealing device of the present invention applied to the starting opening, FIG. 15 is a longitudinal sectional view, FIG. 16 is a right side view, FIG. Is an enlarged sectional view taken along the line 17-17 in FIG. 16, and FIG. 18 is a sectional view similar to FIG. 17 when the inflatable body is expanded. FIG. 19 is a sectional view similar to FIG. 3 showing an embodiment using another fitting, and FIG. 20 is a sectional view similar to FIG. 17 showing an embodiment using still another fitting. It is. FIGS. 21 and 22 are views showing an embodiment of a conventional sealing device. FIG. 21 is a longitudinal sectional view, and FIG. 22 is a right side view. 30, 70, 76, 86, 96: Sealing device, 34, 90: shaft, 36, 92: shaft, 38, 94: shaft, 40, 78: sealing material, 42, 82: hole, 50, 98: Attachment, 60: recess, 62, 72: expansion body, 80, 88: cushioning material.

Claims (9)

(57) [Claims] 1. A pit wall for sealing a gap between a hollow body received in an opening formed in a pit wall and a pit wall for constructing a tunnel or laying a pipeline. A seal device, comprising: an elastically deformable seal material having a hole capable of receiving the hollow body; and an inflatable body expandable by a fluid, wherein at least the hole of the seal material when inflated is inflated. A sealing device for an opening, comprising: an inflatable body for pressing a surrounding part against the outer peripheral surface of the hollow body; and a fixture for fixing the inflatable body and the seal material to the downhole wall. 2. The sealing member includes an elastically deformable annular plate member having the hole, and the inflatable body is located in front of the plate member with respect to a direction in which the hollow body is propelled, and is virtually formed around the hole. Is attached to the fixture so as to extend along an annular line, and the fixture is configured such that a portion of the plate material around the hole is elastically deformed inside the inflatable body by the hollow body. The sealing device according to claim 1, further comprising: a fixing portion that fixes the shaft to the downhole wall. 3. The seal member includes an elastically deformable annular plate member having the hole, and the inflatable body is located in front of the plate member with respect to a direction in which the hollow body is propelled, and is formed around the hole. The plate is attached to the plate so as to extend along an annular line, and the attachment is configured such that a portion of the plate around the hole is elastically deformed inside the inflatable body by the hollow body. The sealing device according to claim 1, further comprising: a fixing portion fixed to the pit wall. 4. The inflatable body is attached to the fixture so as to extend along a virtual annular line around the hole.
The sealing device according to claim 1, wherein the sealing material is disposed on an inner surface of the expansion body. 5. A plurality of elastic members attached to said mounting member so as to protrude toward the center of said inflatable body at a rear side of said hollow body with respect to said inflatable body with respect to said inflatable body. The sealing device according to claim 4, further comprising a plurality of elastic members disposed along the body. 6. The seal device according to claim 1, wherein the inflatable body includes an annular tube extending along an imaginary line around the hole. 7. The seal device according to claim 1, wherein the inflatable body includes a plurality of tubes arranged along a virtual annular line around the hole. 8. The sealing device according to claim 7, wherein the adjacent tubes are connected to each other. 9. The fixing device is an annular fixing portion for fixing an outer peripheral edge of the sealing material, and a concave portion opened on a center axis side of the sealing material to receive the tube. The sealing device according to claim (6) or (7), further comprising an annular recess extending along the portion.