JPH05187195A - Seal mechanism - Google Patents

Abstract

PURPOSE:To prevent the water leakage of a shield device. CONSTITUTION:Wire brushes 24 arranged in a ring shape along the inner periphery of a shell are provided in parallel at the preset interval in the excavation direction on the shell of an inner tube 5 covering the outer periphery of a segment 31, and a grease filling space 22 is formed between the wire brushes 24, 24. A projection layer 20 is arranged on the surface of a member arranged in the grease filling space 22, thus the flowing of grease 27 is prevented, the waste of grease 27 filled in the grease filling space 22 leaking is eliminated, and water is efficiently and economically stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing mechanism for preventing leakage of muddy water or groundwater into the inside of a shield device or the inside of a mine.

[0002]

2. Description of the Related Art Conventionally, various materials such as steel, rubber and urethane have been used in the partition wall and tail portion of a shield device in order to prevent muddy water and ground water from leaking into the shield device or inside the mine. A sealing device formed into a shape is used. In such a sealing device, when a member such as rubber or urethane is used, the wear is severe, so that the sealing function is deteriorated in an extremely short time. Further, when a steel member is used, the steel member Since it lacks conformability to irregularities, a gap is formed between the outer circumference of the segment and where muddy water, groundwater, etc. can seep out, and in any case, it is extremely difficult to obtain a perfect sealing function. Therefore,
A method has been proposed in which a sealing material such as grease is filled between these sealing device members so that the sealing function of such a sealing device is compensated by the viscosity of the sealing material.

[0003]

However, since the sealing material such as grease constantly leaks from between the sealing device members during excavation, it is necessary to constantly replenish the sealing material in the amount reduced by the leakage. Stable sealing performance cannot be maintained. Therefore, a large amount of sealing material is consumed in a wasteful manner due to leakage, which is very uneconomical. Further, since the sealing material has to be filled in at a predetermined cycle, there is a drawback in that the work time is increased and the work efficiency is reduced accordingly. In view of the above circumstances, the present invention provides a sealing device that prevents the leakage of muddy water, groundwater, or the like into a mine or a shield device by using a sealing material such as grease, and prevents the sealing material from leaking from the sealing device. The present invention provides a sealing mechanism capable of exhibiting an efficient and economical sealing function.

[0004]

That is, the present invention has a shell body (5) covering the outer periphery (31e) of a tunnel lining (31), and the shell body (5) has a shield excavator (5). 1)
The shielding wall structure (24) for sealing the inside and the outside of the tunnel is arranged along the outer periphery (31e) of the tunnel lining (31) at a predetermined interval (L2) in the excavation direction, and the shielding wall structure ( Two
The seal material filling space (22) is provided between the two members of 4) in a form capable of filling the seal material (27) made of a viscous material, and the seal material filling space (22) is filled with the seal material (27). A fluidization preventing means (20) is provided and configured. The fluidization preventing means (22) for the sealing material (27) is characterized by comprising a porous member (204), flocked members (201) and (203), and an uneven member (202). The numbers in parentheses () indicate the corresponding elements in the drawings for the sake of convenience, and therefore the present description is not limited to the description in the drawings. below

The same applies to the column of [Operation].

[0005]

According to the present invention, the fluidization prevention means (20) prevents fluidization of the sealing material (27) filled in the sealing material filling space (22) and the sealing material filling space ( 22) It acts to prevent leakage to the outside. In addition, various members (204), (203), (202), (20) are used depending on the properties of the sealing material (27) and the sealing conditions.
The fluidization preventing means (27) consisting of 1) is used selectively or in combination.

[0006]

1 is a diagram showing an example of a shield backfilling device using a sealing mechanism according to the present invention, FIG. 2 is a view of the shield backfilling device shown in FIG. FIG. 4 is an enlarged view of the vicinity of the partition of the backfilling device, FIG. 4 is a partially enlarged view of the inner cylinder sealing device in the shield backfilling device shown in FIG. 1, and FIG. 5 is a view showing another example of the inner cylinder sealing device shown in FIG. 6 to 8 are views showing another example of the protruding layer portion in the inner cylinder sealing device shown in FIG. 4, and FIG. 9 is a view showing an example of a flowing state of grease filled in the inner cylinder sealing device. ..

As shown in FIG. 1, the shield backfilling device 1 is for backfilling an already existing tunnel 30 that is no longer needed to be used for constructing a new tunnel or the like. The backfill device 1 is a tunnel 3
1 is constructed so that the tunnel is once formed in the ground 40 by digging from the right side to the left side in FIG. 1 along the outer circumference of 0, and then the tunnel can be backfilled with the backfill material 36. There is something. That is, the shield backfill device 1 has an outer shell 2 formed in a cylindrical shape, as shown in FIG.
An excavator 7 including a cutter 7a, a driving device 7b, and the like is provided at a front end portion 2a on the left side of the outer shell 2 in the figure. Outer shell 2
A partition wall 3 formed in an annular shape is provided on the inside of the partition wall 3. On the left side of the partition wall 3 in the figure, the outer diameter is approximately the same as the outer diameter of the outer shell 2, and the inner diameter is backfilled. A cutter 7a formed in an annular shape having substantially the same size as the outer diameter of the power tunnel 30.
Are provided toward the front of the outer shell 2, that is, toward the left in the drawing. The cutter 7a includes a drive device 7 including a hydraulic motor and the like.
b is connected so as to rotate the cutter 7a in the directions of arrows E and F shown in FIG. A plurality of hydraulic jacks 6 are arranged in an annular shape along the outer shell 2 behind the partition wall 3, that is, on the right side of FIG.
A ram 6a is provided on the shaft so as to project and retract in the directions of arrows Cs and Ds.

Inside the outer shell 2, to the rear of the hydraulic jack 6, that is, to the right of FIG. 1, a face plate 9 blocks the space inside the outer shell 2 in the left-right direction in FIG. Arrow C, D
It is provided so that it can move in any direction. A backfill material injection pipe 10 is attached to the face plate 9 so that the discharge port 10a communicates with the back face plate 9, that is, to the right in the drawing. Predetermined backfill material 3
A pump or the like (not shown) for pumping 6 is connected. Further, a gripper mount 11 is provided on the left side of the face plate 9 in the figure. The gripper mount 11 has a face plate connector 12, a segment connector 13 and the like, and the face plate connector 12 is
The inside of the tunnel 30 to be backfilled is formed in a cylindrical shape so as to be movable in the directions of arrows C and D. Face plate connector 12
Is provided with a rear end portion 12a via a pin 9b so as to be engageable with and disengageable from a connecting portion 9a fixed to the face plate 9.
The segment connector 1 is provided outside the face plate connector 12.
3, a ram 15a is provided to the face plate connector 12 via a hydraulic jack 15 fixed to the front end portion 12b of the face plate connector 12 so as to be movable in the directions of arrows Cp and Dp. The segment connector 13 has a contact plate 1 formed in an arc shape corresponding to the inner diameter of the tunnel 30 to be backfilled.
A plurality of 6 are provided via a hydraulic jack 17 so as to project and retract in the directions of arrows G and H in FIG. 2, which are radial directions with respect to the axial center CT. Further, outside the face plate connector 12, a plurality of core cutters 19 are provided on the right side of the segment connector 13 in FIG. 1 with respect to the face plate connector 12 in the axial CT direction (arrow C and D directions) and the axial center CT. Is provided so as to be movable in the circumferential direction centering on the center of the cylinder so as to project and retreat in the directions of arrows G and H via a hydraulic cylinder or the like (only one core cutter 19 is shown in the drawing. Exist).

By the way, inside the partition wall 3, an inner cylinder 5 formed in the shape of a cylindrical shell with an inner diameter slightly larger than the outer diameter of the tunnel 30 to be backfilled, is provided as a primary cover for the tunnel 30. 1 is arranged at the right end of FIG. 1 of the segment 31 so as to cover the outer circumference of the segment 31 which is
As shown in FIG. 3, an inner cylinder sealing device 23 is provided on the inner peripheral surface 5a of the inner cylinder 5. The inner cylinder seal device 23 is
As shown in FIG. 4, each of the wire brushes 24 has three wire brushes 24 arranged in the left-right direction in the excavation direction at a predetermined interval L2. The left side) is a mounting member 2 formed by bending a metal plate or the like.
4c, it is fixed in an annular shape along the inner peripheral surface 5a of the inner cylinder 5 via a rivet 242 while being fitted and supported in a support groove 241 that opens to the right in FIG. In the wire brush 24, the respective steel wires constituting the wire brush 24 are planted in such a manner that the tip end thereof is directed rearward (rightward in FIG. 4) or inward (lowerward in FIG. 4) so that the overall shape is widened toward the end. On the outer side (upper side in FIG. 4) and the rear side (right side in FIG. 4) of the wire brush 24, a plate 24a made of an elastic member such as a steel plate spring extends in the left-right direction in FIG. The inner peripheral surface 5a of the inner cylinder 5 is inclined to
Are arranged in an annular shape along. The plate 24a presses the wire brushes 24 forward in the digging direction (leftward in FIG. 4). Therefore, the tip 24d of each wire brush 24 can be brought into contact with the outer peripheral surface 31e of the segment 31, that is, The gap 29 between the wire brush tip 24d and the segment outer peripheral surface 31e can be sealed in the front-rear direction (left-right direction in the drawing). Further, on the front side and the inner side (left side and lower side in FIG. 4) of the wire brush 24, a protective plate 24b made of a steel plate or the like extends in the left-right direction in FIG. The wire brush 24 is provided along the inner peripheral surface 5a of the inner cylinder 5 in an annular shape. The wire brush 24 is provided inside and outside and front and back (up and down and left and right in FIG. 4) by a protection plate 24b and the plate 24a. It has a sandwiched structure. Furthermore, the inner cylinder sealing device 23 has wire brushes 24, 24 adjacent to each other in the front-rear direction (left and right in FIG. 4) with respect to the excavation direction.
The grease-filled spaces 22 between them can be shielded by being sandwiched by the wire brushes 24, 24 in the gap 29. In the embodiment, front and rear (left and right in the drawing)
The grease filling space 2
2 is provided with a grease supply path 5c such that the discharge port 5c 'is located on the inner peripheral surface 5a of the inner cylinder 5 between the wire brushes 24, 24. Further, in the grease filling space 22 of the inner cylinder sealing device 23, as shown in FIG. 4, a large number of steel wires 201 each formed in a short needle shape are planted on a support material (not shown) formed in a foil shape. The protruding layer 20 formed is
Of the members forming the inner cylinder sealing device 23, the surface of the member disposed in the grease filling space 22 is substantially the entire surface (that is, FIG. 4).
In the above, the lower side of the inner cylinder 5, the right side of the plate 24a, the lower side of the mounting member 24c, the left side of the protective plate 24b, etc.) are covered and attached to these members by welding or riveting. As shown in FIG. 4, the protruding layer 20 is not provided on the front side and the inner side (the lower side and the left side in FIG. 4) of the wire brush 24 at the foremost position shown in the leftmost side in FIG. The tunnel 30 to be backfilled is shown in FIG.
And as shown in FIG. 2, a plurality of segment pieces 31a
Is assembled in a cylindrical shape by joint bolts in the axial center CT direction and in the circumferential direction centered on the axial center CT, and the segment 31 having the width L1 of one ring opposes the earth pressure / water pressure of the ground 40. Is built in shape. Further, in the tunnel 30, as shown in FIGS. 1 and 2, a secondary lining 32 is formed inside the segment 31 assembled into a cylindrical shape.

Since the shield backfilling device 1 and the tunnel 30 to be backfilled have the above-described structure, when backfilling the existing tunnel 30 with the shield backfilling device 1, first, the tunnel 30 is removed from a vertical shaft or the like. The ground 40 outside the segment 31 is excavated by hand or mechanical excavation so as to correspond to the outer diameter of the outer shell 2 of the shield backfill device 1. And the shield backfilling device 1
As shown in FIG. 1, the front end 2a of the outer shell 2, the cutter 7a of the excavator 7, and the inner cylinder 5 are inserted outside the excavated segment 31, and the right end of the tunnel 30 in the figure, that is, Install at the end in the direction of arrow D. That is, in the shield backfilling device 1, the outer shell 2 arranges the cutter 7a of the excavator 7 outside the segment 31, and the tunnel 30 to be backfilled.
The segment 31 is installed so as to surround the outside thereof. At this time, the tunnel 30 is blocked by the face plate 9 in the left-right direction in the drawing. Further, the gripper mount 11 is installed in front of the face plate 9, that is, inside the tunnel 30 on the left side in the drawing. When the shield backfill device 1 is installed in the tunnel 30,
In the following manner, the cutter 7a excavates the ground 40 outside the segment 31 and advances the outer shell 2, and the outer shell 2 and the face plate 9 of the shield backfill device 1 adjust the pressure of the ground 40 and the backfill portion 37. Inside the outer shell 2, the segment 31 and the secondary lining 32, which are cylindrically assembled by joint bolts, are disassembled and removed, and the face plate 9 is divided into the segment 31 and the secondary lining 32. While advancing to the unfilled portion 35 of the removed tunnel 30, the backfill material 36 is press-fitted into the backfill portion 37 behind the face plate 9 to backfill the tunnel 30.

When the shield backfilling device 1 is installed in the tunnel 30 in this manner, the tip 24d of the inner cylinder sealing device 23 is shown in FIG. 3 as the wire brush 24 is pressed forward by the plate 24a in the excavation direction. As shown in FIG. 4, the grease-filled space 22 is formed between the wire brushes 24, 24 so as to come into contact with the outer peripheral surface 31e of the segment 31. Therefore, first, the grease 27 is supplied from the grease supply path 5c, and the wire brush 24,
The space between 24 is filled with grease 27, and the inner cylinder 5 and the segment 3
The gap 29 with 1 is sealed in a cylindrical shape. Further, as shown in FIG. 1, the gripper mount 11 is moved in the tunnel 30 in the direction of arrow D, and the rear end portion 12a of the face plate connector 12 is connected to the connecting portion 9a of the face plate 9 via the pin 9b. Then, the ram 17a of the hydraulic jack 17 is projected in the direction of the arrow G, and the contact plate 16 is pressure-bonded to the inner peripheral surface 32a of the secondary lining 32, whereby the segment connector 13 is connected to the segment 3
It is fixed to the first and second linings 32. Then, the face plate connector 12 is fixed to the segment 31 and the secondary lining 32 via the segment connector 13 and the hydraulic jack 15, and the face plate 9 is connected to the segment 31 via the face plate connector 12.
And fixed to the secondary lining 32. Next, the mud pipe 8 supplies pressurized mud to the left side of the partition wall 3 in FIG.
2 while rotating the cutter 7a of the excavator 7 in the direction of arrow E (or F) in FIG. 2, the ram 6a of each hydraulic jack 6 is moved in the direction of arrow Ds as in the hydraulic jack 6B shown in FIG. And press the face plate 9 so that the segment 3
The cutter 7a is pressed through the partition wall 3 in the direction of the cutting edge 40a, that is, in the direction of arrow C in the form of obtaining a reaction force from the face plate 9 fixed to the first and second linings 32. Then, due to the pressing force, the cutter 7a and the cutting face 40a come into contact with each other with a predetermined contact pressure, the cutting face 40a is excavated by the cutter 7a, and the hole 40b is formed in an annular shape outside the segment 31 in a shape corresponding to the shape of the outer shell 2. Formed in. At the same time, the outer shell 2 has a hole 40
It advances in the direction of arrow C while being inserted into b. At this time, the inner cylinder 5 on the rear side of the cutter 7a is attached to the segment 31 as shown in FIG.
Although moving in the direction of arrow C, the gap 29 between the inner cylinder 5 and the segment 31 is reliably stopped by the inner cylinder seal device 23, and the tunnel 3 on the right side of the partition wall 3 in the figure from the face 40a.
0 Leakage of groundwater and muddy water into the interior is prevented. That is, when the tunnel 30 is constructed, the backfill material 40c is filled between the segment 31 and the ground 40, and the backfill material 40 is also attached to the outer peripheral surface 31e of the segment 31. Further, since the segment 31 itself may be deformed, the segment 31 excavated by the cutter 7a
Local irregularities occur on the outer side of the inner cylinder 5 and the segment 3
It is difficult to keep the gap 29 with 1 at a constant width. However, in the above-described inner cylinder sealing device 23, the wire brushes 24 arranged in triplicate in the front-back direction (left-right direction in the figure) in the excavation direction at predetermined intervals L2 are pressed against the plate 24a, respectively. The gap 29 is always favorably blocked in a manner that closely follows the local unevenness. In addition to this, even if groundwater or muddy water leaks from the wire brush 24, the viscosity of the grease 27 filled in the grease filling space 22 between the wire brushes 24, 24 makes the groundwater or muddy water more than that. Can be prevented and the sealing function of the wire brush 24 can be supplemented,
Leakage of groundwater and muddy water supplied by the mud pipe 8 near the face 40a on the front side of the partition wall 3 shown on the left side of FIGS. 1 and 3 is effectively prevented.

By the way, as described above, by moving the cutter 7a forward in the direction of arrow C, the inner cylinder 5 is moved to the segment 3
As shown in FIG. 9, when the wire brush 24 is fixedly mounted, the inner cylinder 5 and the segment 31 move substantially in the arrow Cu and Du directions as shown in FIG. become. Then, at this time, the grease 27 is a viscous body which is simply kept in shape by being filled in the grease filling space 22, and the members of the grease 27 which sandwich the upper and lower sides of FIG. 9 are in opposite directions (arrows Cu and Du). ), The grease 27 near the bottom of the grease filling space 22 in FIG.
It is assumed that the inner cylinder 5 is moved relative to the inner cylinder 5 in the direction of the arrow Dj, following the relative movement in the direction. Further, when a smooth steel surface as shown in FIG. 9 is arranged around the grease 27 filled in the grease filling space 22 due to such a flow of the grease 27, the grease is spread along the smooth steel surface. Let 27 be a convection stream. Then, the grease 27 that flows along the smooth steel surface penetrates into a slight gap between the members forming the wire brush 24 from, for example, the position PT1 in FIG. 9 to make the grease also flow inside the gap. Then, as described above, due to the local unevenness on the outside of the segment 31, when the wire brush 24 passes through the uneven portion, the tip 24 thereof is passed.
When a slight gap is formed between d and the outer peripheral surface 31e of the segment, the grease 27 leaks to the outside of the grease filling space 22 through the gap. So usually,
In this way, the grease 27 that has leaked to the outside of the grease filling space 22 is always replenished immediately so that the grease filling space 22 is always filled.
If the grease 27 is not fully filled in the grease 27, the grease becomes thin, and the grease filling space 2 that is thin in the grease 27 is diluted.
In the form that breaks through 2, muddy water or groundwater is the inner cylinder sealing device 23.
4 will leak to the rear side shown in the right side of FIG. However, in the present invention, as shown in FIG.
Among the members constituting the inner cylinder 5, the inner cylinder 5, the plate 24a,
Since the protrusion layer 20 is arranged so as to substantially cover the surface of the member exposed in the grease filling space 22 such as the protective plate 24b and the mounting member 24c, the grease 27 filled in the grease filling space 22 is thereby formed. Is prevented as much as possible, and when the inner cylinder 5 advances in the direction of arrow C as the cutter 7a advances, the grease 27 smoothly moves in the direction of arrow C almost integrally with the inner cylinder 5. .. Therefore, the grease 27 moves relatively in the direction of the arrow Dj in a form of separating from the inner peripheral surface 5a of the inner cylinder 5, or the smooth surface such as the surface of the plate 24a or the protection plate 24b forming the wire brush 24. 4 and 9, the wire brush 24 is prevented from penetrating into the wire brush 24 from the position shown by the arrow PT1 in FIG. 4 and FIG. However, the inner cylinder sealing device 23 can always exhibit a stable sealing function without having to replenish the grease 27 in a large amount.

Thus, the segment 31 of the tunnel 30
When the outer shell 2 moves forward by the width L1 of one ring, the ram 6a of the hydraulic jack 6 is in a state of protruding in the direction of the arrow Ds, and the face plate 9 fixed to the segment 31 and the secondary lining 32. Is positioned at the rear end portion 2b of the outer shell 2, and further, the rearmost segment piece 31a of the tunnel 30, that is, the rightmost segment piece 31a in FIG. 1 projects from the inner cylinder 5 toward the face plate 9 side. In this state, the forward movement of the outer shell 2 by the hydraulic jack 6 is stopped and the excavation of the ground 40 by the cutter 7a is stopped. Then, the rearmost segment piece 31a is disassembled and removed in a circumferential direction with respect to the axial center CT integrally with the secondary lining 32 inside the segment piece 31a. That is, the core cutter 19 installed on the face plate connector 12 is appropriately moved in the axial CT direction and in the circumferential direction with respect to the axial CT, and the rearmost segment pieces 3 are moved.
It is positioned at the joint portion in the circumferential direction of 1a, or the joint portion between the rearmost segment piece 31a and the segment piece 31a in front thereof. Segment pieces 31a, 31a
When the core cutter 19 is positioned at the joint part of
The core cutter 19 is projected in the direction of the arrow G, the secondary lining 32 is penetrated, and the bolt box of the segment piece 31a is perforated. The segment pieces 31a, 31a that have been formed are separated. Then, when each joint bolt between the segment pieces 31a, 31a is cut by the core cutter 19,
The rearmost segment piece 31a and the secondary lining 32 are integrally grasped through an appropriate segment grasping and crushing device, and they are rocked, for example, in the vertical direction in FIG. Then,
The rearmost segment piece 31a and the secondary lining 32 are
Bending with respect to the adjacent segment piece 31a and the secondary lining 32, the secondary lining 32 is cracked and ruptured in the vicinity of the joint portion of the segment piece 31a,
The segment piece 31a and the secondary lining 32 on the inner side thereof
And are dismantled and removed together. Then, the face plate connector 12 in a state where the removed segment piece 31a and the secondary lining 32 are gripped by the segment gripping and crushing device or the like.
Is moved in the circumferential direction and placed on the bottom of the outer shell 2 of the face plate connector 12 in the lower part of FIG.

The segment piece 31a and the secondary lining 32
When the above is removed, the shield fixing device (not shown) is engaged with the newly rearmost segment piece 31a and the secondary lining 32 inside thereof. Next, the hydraulic jack 17
Ram 17a is retracted in the direction of arrow H to release the contact state between the contact plate 16 and the inner peripheral surface 32a of the secondary lining 32, and the rear end of the face plate connector 12 via the pin 9b. Part 12
After releasing the connection state between a and the connecting portion 9a of the face plate 9,
Move the gripper mount 11 inside the tunnel 30 in the direction of arrow C,
It is moved to the opposite side of the face plate 9. Then, the rear end portion 12a of the cylindrical face plate connector 12 is opened, passes through the inside of the face plate connector 12, and the face plate 9 side on the right side of the gripper mount 11 and the left side of the gripper mount 11 on the left side in the drawing. Since it is movable between the vertical shaft (not shown) and the vertical shaft (not shown), the segment piece 3 dismounted and placed on the bottom of the outer shell 2 as described above.
1a and the secondary lining 32 are moved to the left in the figure of the gripper mount 11 via a monorail or the like that passes through the inside of the connector 12, and are further loaded on a trolley or the like to move from the vertical shaft to the tunnel 3
Carry out to outside of 0. When the segment piece 31a and the secondary lining 32 are carried out, the gripper frame 11 is moved inside the tunnel 30 in the direction of arrow D, and the face plate connector 12 and the face plate 9 are again connected to the rear end 12a and the pin 9b. , Connection 9
Connect via a. At this time, the hydraulic jack 1 between the face plate connector 12 and the segment connector 13 of the gripper mount 11
The ram 15a of No. 5 is retracted in the direction of the arrow Dp so that the segment connector 13 is located on the front side of the face plate connector 12, that is, on the opposite side of the face plate 9. Then, as shown in FIG. 1, the ram 17a of the hydraulic jack 17 is projected in the direction of the arrow G, and the contact plate 16 is crimped to the inner peripheral surface 32a of the secondary lining 32, whereby the segment connector 13 is segmented. Three
The face plate 9 is fixed to the segment 31 and the secondary lining 32 via the hydraulic jack 15 and the face plate connector 12 while being fixed to the first and second linings 32. Next, the ram 6a of each hydraulic jack 6 pressing the face plate 9 is
Like the hydraulic jack 6A shown in FIG. 1, the hydraulic jack 6A is retracted in the direction of the arrow Cs and separated from the face plate 9. Then, the ram 15 of the hydraulic jack 15 between the face plate connector 12 and the segment connector 13
By projecting a in the direction of arrow Cp, the face plate connector 12 is moved in the direction of arrow C with respect to the segment connector 13 fixed to the segment 31 and the secondary lining 32, and is connected to the face plate connector 12. The face plate 9 is advanced to the unfilled back portion 35 of the tunnel 30 from which the segment piece 31a has been removed, which has not been backfilled. Substantially at the same time as the advance of the face plate 9, the backfill part consisting of the tunnel 30 part where the segment 31 and the secondary lining 32 on the rear side of the face plate 9, that is, the right side in the figure, has already been removed, and the hole 40b part by the advance of the outer shell 2. Three
The backfill material 36 is press-fitted from the backfill material injection pipe 10 into the column 7.

In this way, the face plate 9 advances to the unfilled portion 35, and the backfill portion 37 behind the face plate 9 is filled with the backfill material 36, so that one of the segments 31 of the tunnel 30 is filled.
When the backfilling work for the length L1 of the ring is completed, the face plate 9 is advanced to the vicinity of the retracted ram 6a of each hydraulic jack 6 like the ram 6aA of the hydraulic jack 6A shown in FIG. Then, again, like the ram 6aB of the hydraulic jack 6B shown in FIG. 1, the ram 6a of each hydraulic jack 6 is projected in the direction of the arrow Ds to press the face plate 9, and the outer shell 2 by a shield fixing device (not shown) is used. The engagement state between the segment 31 and the secondary lining 32 is released.
Then, as described above, the contact plate 16, the segment connector 13, the face plate connector 1 with the gap 29 between the inner cylinder 5 and the segment 31 being stopped by the inner cylinder seal device 23.
While excavating the ground 40 on the outside of the segment 31 by the cutter 7a so as to obtain a reaction force from the face plate 9 fixed to the segment 31 and the secondary lining 32 via the outer shell 2
Is further advanced, and backfilling work is further performed by the length L1 of one ring of the segment 31. In this way, the backfilling work of the tunnel 30 by the shield backfilling device 1 proceeds in a manner facing the pressure of the ground 40 and the backfilling portion 37, so that the removal work of the segment 31, the secondary lining 32, etc. can be performed safely. In addition to being able to go, it is possible to suitably fill the backfilling portion 37 with the backfilling material 36.

In the above-described embodiment, the inner peripheral surface 5a of the inner cylinder and the outer peripheral surface 31e of the segment are formed such that the wire brush 24 is pressed forward by the plate 24a in the excavation direction.
Although the example in which the gap 29 between the inner and outer ends of the wire brush 24 is configured to be sealed is described, the wire brush 24 is further artificially added from the inner cylinder 5 side to the segment 31 side via the plate 24a as shown in FIG. Inner cylinder seal device 2 so that it can be pressed by
3 may be configured. That is, in FIG. 5, the rubber bellows 2 is provided outside the plate 24a (upper part in FIG. 5).
5 is provided so as to be fixed to the inner peripheral surface 5a of the inner cylinder 5, and the inner space of the bellows 25 communicates with the pressurized water supply passage 5b formed in the inner cylinder 5. When the shield backfilling device 1 is arranged in the tunnel 30 to be backfilled and the cutter 7a is used to excavate the face 40a, the pressurized water 26 is supplied from the pressurized water supply path 5b to the inside of each bellows 25 of the inner cylinder sealing device 23. To supply. Then, the bellows 25 expands downward in the figure, and the wire brush 24 can be surely pressed to the segment 31 side through the plate 24a, so that each wire brush 24 is segmented into the segment 31.
The outer peripheral surface 31e of the segment 31 can be kept in close contact with the local irregularities on the outer side of the inner wall of the segment 31 in a finely-divided state, whereby the sealing function of the inner cylinder sealing device 23 becomes even more reliable. In the above case,
Although the wire brush 24 is pressed to the segment 31 side by water pressure via the bellows 25, the wire brush 24 may be pressed to the segment 31 side by hydraulic pressure or air pressure.

Further, in the above-described embodiment, the protrusion layer 20 provided in the grease filling space 22 of the inner cylinder seal device 23 is a support material in which a large number of short needle-shaped steel wires 201 are formed in a foil shape ( Although not shown in the drawings), an example is described in which the inner cylinder 5, the plate 24a, the protection plate 24b, the mounting member 24c, etc. are mounted by welding or riveting, but the protruding layer 20 is Tube 5 and plate 24
These may be formed integrally with the grease, and the shape of the protrusion layer 20 may be the same as that of the grease 2 as described above.
It is not limited to the one shown in FIG. 4 as long as the fluidization of No. 7 can be prevented. That is, for example, the protrusion layer 20 includes the inner cylinder 5 and the plate 2 of the inner cylinder seal device 23.
4a, the protective plate 24b, the mounting member 24c, etc., such that the unevenness is arranged on the surface of the grease filling space 22 side,
For example, a rib 202 in the form of a grid frame-shaped ridge as shown in FIG. 6 may be formed integrally with the members 5, 24a, 24b, and 24c. In addition, it may be a groove, a point projection, a corrugate, a roughening, or any other shape. Further, the members 5 arranged in these grease filling spaces 22,
Even if the metal surfaces of 24a, 24b, and 24c are subjected to surface treatment to increase frictional resistance with an object to be contacted, or sheet materials that increase such frictional resistance are laid out, The unevenness is provided on the surfaces of the members 5, 24a, 24b, 24c. Furthermore, the protruding layer 20
Is steel wool, synthetic resin material,
A flocking member formed by flocking fibers 203 such as bristles, woven fabrics, and non-woven fabrics, or a porous member such as a mesh 204 obtained by processing a wire rod made of steel, synthetic resin, or the like into a net shape as shown in FIG. The inner cylinder 5, the plate 24a, the protective plate 24b, the mounting member 24c, and the like are mounted on the surface of the grease-filled space 22 side by an adhesive, welding, or other appropriate means, or have another form. It does not matter if it is configured. These various forms of the protrusion layer 20 can be used as the inner cylinder seal by selectively or combining the most appropriate one of these depending on the properties of the ground 40, the construction conditions, and the properties of the grease 27. The sealing mechanism of the device 23 or the like can exhibit a reliable and economical sealing function. Further, in the above-described embodiment, the example in which the seal mechanism according to the present invention is used for the inner cylinder seal device 23 of the shield backfill device 1 has been described.
The sealing mechanism according to the present invention is also suitable for use in, for example, a tail seal portion of a shield device for excavating a new tunnel in the ground 40. That is, the shield device for excavating a new tunnel in the ground 40 is, of course, different from the above-described embodiment in the configuration of the shield device itself. However, in the shield device for the new tunnel, ground water, muddy water, etc. are discharged from the tail clearance portion. Since it is necessary to seal this to prevent water leakage, in this case, the wire brush 24 has a shape in which the attachment member 24c is attached to the skin plate of the shield tail so that the tip 24d of the wire brush 24 covers the outer circumference of the segment. If applied in, there is no problem.

[0018]

As described above, according to the present invention, there is provided a shell body such as the inner cylinder 5 which covers the outer circumference of the outer circumferential surface 31e of the tunnel lining such as the segment 31 and the like. A shield wall structure such as a wire brush 24 for sealing the inside and outside of a shield excavator such as the shield backfill device 1 is arranged along the outer periphery of the tunnel lining at a predetermined interval L2 in the excavation direction, and the shield is provided. Grease filling space 2 between two wall structures
A sealing material filling space such as 2 is provided so that a sealing material made of a viscous material such as grease 27 can be filled, and a fluidization preventing means for the sealing material such as the protrusion layer 20 is provided in the sealing material filling space. With this configuration, the fluidization preventing unit prevents fluidization of the sealing material filled in the sealing material filling space, and suppresses leakage to the outside of the sealing material filling space. Therefore, since the sealing material filling space is always filled with the sealing material without leaking from the filling space during the excavation work of the shield excavator, it is not necessary to replenish the sealing material one after another in a large amount. Then, the groundwater and muddy water generated on the outside of the shield excavator are prevented from leaking into the shield by being blocked by the shield wall structure, but in addition to this, water leaks into the shield wall structure. Even if it occurs, the leakage of water is effectively stopped by the sealing material filled in the sealing material filling space. Therefore, according to the present invention, it is possible to surely prevent water leakage with a replenishment amount as small as possible without wasting a large amount of the seal material, and it is possible to save the seal material replenishment work, which is economical for the shield excavator. In addition, it becomes possible to constantly develop an efficient sealing function. Further, the fluidization preventing means of the sealing material is a porous member such as a mesh 204, a flocked member such as a steel wire 201 and a fiber 203, or a rib 2.
If it is constituted by a concave-convex member such as 02, fluidization preventing means composed of various members can be used selectively or in combination depending on the properties of the sealing material and the sealing conditions. Therefore, by using the fluidization preventing means selectively or in combination, the sealing mechanism according to the present invention can be applied to a wide variety of shield excavators without being caught in the construction form, and it is most suitable for each case. The sealing function can be easily developed more economically and efficiently.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a shield backfilling device using a sealing mechanism according to the present invention.

FIG. 2 is a view of the shield backfill device shown in FIG.

FIG. 3 is an enlarged view of the vicinity of a partition wall of the shield backfill device shown in FIG.

4 is a partially enlarged view of an inner cylinder sealing device in the shield backfilling device shown in FIG.

5 is a diagram showing another example of the inner cylinder sealing device shown in FIG.

FIG. 6 is a diagram showing another example of a protrusion layer portion in the inner cylinder sealing device shown in FIG.

FIG. 7 is a diagram showing another example of a protrusion layer portion in the inner cylinder sealing device shown in FIG.

8 is a diagram showing another example of a protrusion layer portion in the inner cylinder sealing device shown in FIG.

FIG. 9 is a diagram showing an example of a flow state of grease filled in the inner cylinder sealing device.

[Explanation of symbols]

 1 ... Shield backfill device (shield excavator) 5 ... Inner cylinder (shell) 20 ... Protrusion layer (sealant fluidization prevention means) 22 ... Grease filling space (sealing material filling space) 24 ... Wire brush (shield wall structure) 27 ... Grease (seal material) 31 ... Segment (tunnel lining) 31e ... Segment outer peripheral surface (outer circumference of tunnel lining) 201 ... Steel wire (flocking member) 202 ... Ribs (concavo-convex member) 203 ... Fiber (flocking member) 204 ... Mesh (porous member)

Claims (4)

[Claims] 1. A shield wall structure, which has a shell body covering the outer circumference of a tunnel lining and seals the inside and the outside of a shield excavator in the shell body, is formed along the outer circumference of the tunnel lining. In a predetermined direction, a sealing material filling space is provided between the two shielding wall structures in a form capable of filling a sealing material made of a viscous material, and the sealing material filling space is provided with the sealing material. A sealing mechanism that is configured by providing a fluidization preventing means. 2. The sealing mechanism according to claim 1, wherein the fluidization preventing means for the sealing material is a porous member. 3. The sealing mechanism according to claim 1, wherein the fluidization preventing means for the sealing material is a flocked member. 4. The seal mechanism according to claim 1, wherein the fluidization preventing means for the sealing material is an uneven member.