JP3852163B2 - Tail seal replacement device for shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tail seal exchange device for exchanging a tail seal attached to an inner peripheral surface of a tail plate of a shield machine.
[0002]
[Prior art]
On the inner peripheral surface of the tail plate of the shield machine, a tail seal is provided for sealing between the outer peripheral surface of the existing segment located inside the tail plate. The tail seal is pressed and rubbed against the outer peripheral surface of the existing segment during the excavation of the shield machine. For this reason, when performing long-distance excavation, replacement of the tail seal is indispensable.
[0003]
Conventionally, replacement of the tail seal has been considered such as the method of stopping the ground water by freezing the surrounding ground and chemical injection, or the method of guiding the shield machine to the intermediate shaft once and performing it inside, etc. Large costs and prolonged construction periods are inevitable. Therefore, a pressure-expandable bag is attached to the outer peripheral surface of the segment, and the bag is inflated and brought into contact with the inner peripheral surface of the tail plate to temporarily close and stop the tail plate and the segment. There has been proposed a system in which water is added and the tail seal inside thereof is exchanged (JP-A-3-244793, etc.).
[0004]
[Problems to be solved by the invention]
However, when the bag body attached to the segment is inflated and pressed against the inner peripheral surface of the tail plate to stop the water, the seal portion of the bag body against the tail plate has a large pressure receiving area but a low pressing pressure per unit area. Since it becomes a single row in the shape, there is a risk that water stop failure may occur. In addition, even if the sealing material is injected into such a sealing part to increase the water-stopping property, the sealing part is a ring-shaped single row, so that the injected filler is washed away to the rear side of the sealing part, The filler cannot be held in a compact state, and sufficient water stoppage cannot be obtained.
[0005]
In addition, if the bags are installed in double rows, a compacted holding space for the filler can be formed.However, since the inner surface of the tail plate of the shield machine requires a long contact surface in the drilling direction, the length of the shield machine is increased. The curve construction performance is harmed.
[0006]
The object of the present invention, which was created in view of the above circumstances, is that the above filler can be consolidated and does not require a long contact surface in the excavation direction, so that it is unnecessary or minimal to extend the length of the shield machine. An object of the present invention is to provide a tail seal replacement device for a shield machine capable of increasing the water-stopping property.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is an apparatus for exchanging a tail seal attached to an inner peripheral surface of a tail plate of a shield machine, which is connected to an existing segment and is rearward of the tail seal to be exchanged with excavation. and special segment located, the special segment plurality disposed adjacent each other and tunnel circumferential direction at predetermined intervals in the tunnel axis direction, and the movable dam member movable in each tunnel radially outwardly, each movable When the weir piece is moved outward in the tunnel radial direction, one end is fixed to one of the adjacent movable weir pieces and the other end is closed in order to close the gap formed between the movable weir pieces adjacent in the tunnel circumferential direction. a fixed wrap that extends on the other side of the adjacent movable weir piece, a radially expansible mechanism for pressing the tip to the tail plate peripheral face by moving the movable weir piece tunnel radially outward, the enlarged diameter Structure by in which and a injection port for injecting a filler material in the compartment spaces in which in the movable weir piece and tail plate and special segments moved to the tunnel radially outward.
[0008]
In addition, at a location where the special segments are adjacent to each other in the tunnel circumferential direction, on one movable weir piece equipped on one adjacent special segment, on the other movable weir piece side equipped on the other adjacent special segment You may provide the movable wrap which can move toward a tunnel circumferential direction.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0012]
As shown in FIG. 1, a cylindrical tail plate 2 having a thinner plate thickness is attached to a rear end portion of a cylindrical shield frame 1 serving as an outline of the shield machine. On the inner peripheral surface of the tail plate 2, brush-like tail seals 4a and 4b for sealing between the outer peripheral surfaces of the existing segments 3a, 3b and 3c located inside the tail plate 2 are spaced apart from each other in the axial direction. It is attached to the front and back. The tail seal 4 may be three or more rows.
[0013]
The base portions of the tail seals 4a and 4b are held by being held between holding plates 5a and 5b which are bent and formed in a U-shaped cross section. The holding plates 5 a and 5 b are attached in a ring shape along the circumferential direction of the tail plate 2, and are round bars at predetermined positions on the step difference between the shield frame 1 and the tail plate 2 and the inner peripheral surface of the tail plate 2. 6 is positioned and attached. Of these two stages of front and rear tail seals 4a and 4b, the front row 4a can be replaced by using a tail seal replacement device described below.
[0014]
The tail seal exchanging device includes a special segment 7 that is connected to the existing segment 3a and that is positioned behind the tail seal 4a to be exchanged with the excavation of the shield machine. That is, the special segment 7 is first moved to a rear position relative to the shield frame 1 by being pushed by a propulsion jack (not shown) connected to the existing segment 3a and provided in the shield frame 1 to advance the shield machine. After that, the normal segment 3b is connected and pushed by the propulsion jack, and the shield machine advances to be positioned behind the tail seal 4a to be replaced.
[0015]
The special segment 7 is divided into a plurality of arc-shaped pieces in the circumferential direction of the tunnel like the normal segment 3. The special segment 7 has two connection plates 8 and 8 formed in an arc shape in accordance with the shape of the end face of the normal segment 3, and is interposed between the connection plates 8 and 8 so as to partition the inside and outside of the tunnel. And a partition plate 9 formed along the circumferential direction of the tunnel (see FIG. 3). A reinforcing rib 10 is provided on the inner peripheral surface of the partition plate 9. Further, in order to join the special segment pieces, rectangular flange plates 200 are provided at both ends of the special segment pieces by being connected to the partition plate 9 and the connection plates 8 and 8 by welding on three sides.
[0016]
The partition plate 9 is formed with screw holes 12 of bolts 11 for connecting the normal segments 3 to the special segments 7 at predetermined intervals in the circumferential direction, and the bolts 100 for joining the segment pieces of the special segments 7 together. Bolt holes 101 are formed in the flange plate 200 at the end of the segment piece. Further, as shown in FIG. 1, movable weirs 13 and 13 that expand and contract freely in the radial direction are arranged at predetermined intervals in the tunnel axis direction inside the outer peripheral sides of the two connection plates 8 and 8, respectively. ing. The distance between the movable weirs 13, 13 is set to be narrower than the width of the inner peripheral surface of the holding plate 5b of the tail seal 4b in the tunnel axis direction.
[0017]
As shown in FIG. 3, the movable weir 13 is composed of a plurality of movable weir pieces 14 divided in the circumferential direction of the tunnel together with each segment piece constituting the special segment 7. As shown in FIGS. 6 and 7, the movable weir pieces 14 are connected together by connecting members 15 a and 15 b that are separated by a predetermined distance in the tunnel axis direction. In this way, the movable dam block 16 configured integrally with the connecting members 15a and 15b is guided by the connecting plate 8 and freely moves in the radial direction.
[0018]
Each movable weir block 16 is moved in the radial direction by a diameter expanding mechanism 17 as shown in FIG. As shown in FIGS. 1 and 4, the diameter expansion mechanism 17 includes a bolt support portion 18 attached to the movable weir block 16 and a bolt 19 rotatably supported by the bolt support portion 18. The bolt 19 is rotatably supported by the bolt support portion 18 by a head portion 20 and a nut 21, and the shaft portion 22 is screwed into the screw hole 23 of the partition plate 9. The shaft part 22 is provided with a fixing nut 24. A hexagonal surface 25 for rotating the bolt 19 is formed at the tip of the shaft portion 22. The nut 21 is fixed to a predetermined position by welding or the like on the bolt 19 without tightening the bolt support portion 18 or the partition plate 9. The hexagonal surface 25 may be a square surface.
[0019]
According to this configuration, when the movable weir block 16 is moved radially outward from the state shown in FIG. 4, the fixing nut 24 is first loosened and the bolt 19 is attached to the partition plate 9 using the hexagonal surface 25. Rotate to tighten into the screw hole 23. Then, as shown in FIG. 5, the movable weir block 16 is screwed outward in the radial direction. And the rubber part 26 for a seal | sticker provided in the top part of each movable dam piece 14 is pressed on the holding plate 5b of the tail seal 4b as shown in FIG.2 and FIG.5.
[0020]
As a result, the ring-shaped closed space 27 (filling chamber) having a predetermined thickness (length) in the tunnel axis direction is formed by each movable weir piece 14, the holding plate 5b, and the partition plate 9 moved radially outward. Is formed. An inlet 28 for injecting a filler into the filling chamber 27 is provided in the partition plate 9 as shown in FIGS. The filler may have a water-stopping function or a material that chemically changes to a substance having a water-stopping function after injection (for example, a foam-expanded, semi-consolidated, single-foam foamed urethane, etc. after injection by mixing two liquids) To be used).
[0021]
The injection port 28 is provided with a valve 29 for filling and holding the filler. When the filler is injected into the filling chamber 27 from the injection port 28, a ring-shaped water stop zone having a predetermined length in the tunnel axis direction is formed.
[0022]
By the way, if each movable dam piece block 16 is moved radially outward, a gap is generated in the circumferential direction between the adjacent movable dam pieces 14, 14, and the filler may leak from the gap. It is done. Therefore, as shown in FIGS. 3 to 5, a fixed wrap 30 is provided on the movable weir piece 14 adjacent in the same segment piece of the special segment 7. As shown in FIGS. 6 to 7, the fixed wrap 30 has one end welded to the inside of one movable weir piece 14 and the other end extended to the other movable weir piece 14. The fixed wrap 30 closes the gap between the adjacent movable weir pieces 14 and 14 when the movable weir piece 14 is changed from the reduced diameter state shown in FIGS. 4 and 6 to the enlarged diameter state shown in FIGS. 5 and 7. .
[0023]
In addition, for the movable weir pieces 14 and 14 where the segment pieces of the special segment 7 are adjacent to each other, if the above-described fixed wrap 30 is provided, the fixed wrap 30 protrudes from the end of the segment piece of the special segment 7. In order to prevent the segment piece of the special segment 7 from being assembled, a movable wrap 31 that can be moved in and out in the circumferential direction is provided instead of the fixed wrap 30. As shown in FIGS. 6 to 7, the movable wrap 31 includes movable wrap pieces 32, 32 that are movably disposed in the circumferential direction inside the movable weir piece 14, and plates that connect the movable wrap pieces 32, 32. And a bar-like connecting member 34.
[0024]
As shown in FIGS. 4 and 8, bolts 35 are inserted into the holes 33 a of the plate-like connecting member 33. The head side of the bolt 35 is inserted into the hole 36 of the connecting member 15a that connects the movable weir pieces 14, 14. A spring 37 is inserted into the bolt 35 between the connecting member 15a of the movable dam pieces 14, 14 and the plate-like connecting member 33 of the movable wrap pieces 32, 32. The connecting member 15 a of the movable weir pieces 14, 14 is in contact with a stopper 38 provided on the partition plate 9. The plate-like connecting members 33 of the movable wrap pieces 32, 32 are in contact with stopper bolts 39 screwed into the partition plate 9.
[0025]
A nut 40 is screwed into the shaft portion of the bolt 35. The nut 40 is first screwed to the position indicated by the broken line 41 in FIG. 4 when the segment piece alone is compressed to compress the spring 37, and in that state, the stopper bolt 39 is screwed into the set state, and then the solid line 40 in FIG. It returns to the position shown. In this state, the movable wrap 31 is located inside the movable dam piece 14 without protruding from the circumferential end of the movable dam piece 14 at the end of the segment piece of the special segment 7. When the stopper bolt 39 is loosened from this state, a reaction force is applied to the stopper 38 of the partition plate 9 and the spring 37 extends, so that the movable wrap 31 is movable at the end of the segment piece of the special segment 7 as shown in FIG. It protrudes from the circumferential direction edge part of the piece 14 to the adjacent segment piece side (refer FIG. 5).
[0026]
After that, when the bolt 19 constituting the above-described diameter expanding mechanism 17 is tightened and the movable weir block 16 including the movable wrap 31 is moved radially outward, the state shown in FIG. The gap between the movable dam pieces 14, 14 between the segment pieces of the special segment 7 to be closed is closed. The movable wrap 31 may be provided only in one of the segment pieces of the adjacent special segment 7, and the segment piece constituting the special segment 7 having the movable wrap 31 is not provided. It may be assembled first or later.
[0027]
Further, as shown in FIG. 9, the movable wrap 31 is formed with a guide groove 42 that serves as a guide when the movable wrap 31 moves in the circumferential direction, and the movable dam piece 14 is inserted into the guide groove 42. A rod 43 is attached (see FIG. 5).
[0028]
The operation of the present embodiment having the above configuration will be described.
[0029]
When replacing the tail seal 4a in the front row shown in FIG. 1, first, the special segment 7 is connected to the existing segment 3a by one ring, and the special segment 7 is to be replaced as the shield machine advances. It should be located at the back. Each segment piece of the special segment 7 incorporates all of the movable weir block 16, the fixed wrap 30, the diameter expansion mechanism 17, and the like, and the movable wrap 31 is incorporated in one of the adjacent segment pieces. At this time, as shown in FIGS. 1, 3, 4, 6, and 8, the special segment 7 is in a state in which the movable weir 13 is reduced in diameter and the movable wrap 31 is retracted. As shown in FIG. 1, the shield machine is advanced so that the special segment 7 is positioned at the holding plate 5b of the tail seal 4b in the rear row, and then stopped.
[0030]
Then, the stopper bolt 39 shown in FIG. 4 is loosened, and the movable wrap 31 projects in the circumferential direction as shown in FIGS. And the bolt 19 which comprises the diameter expansion mechanism 17 is tightened, each movable dam piece block 16 is moved to radial direction outward, and the rubber | gum provided in the top part of each movable dam piece 14 as shown in FIG.2 and FIG.5. The portion 36 is pressed against the holding plate 5b of the tail seal 4b. At this time, the special segment 7 is in the state shown in FIGS. 2, 5, 7 and 9. Thereby, the ring-shaped filling chamber 27 having a predetermined thickness in the tunnel axis direction is formed by the movable weir 13, the holding plate 5b, and the partition plate 9. Thereafter, a filling material (including an infusion material that chemically changes into a single-foam foamed urethane that is solidified in the latter half of the injection) is injected into the filling chamber 27 from the injection port 28 shown in FIGS.
[0031]
Then, the filler is held in the filling chamber 27 in a compact state, and a ring-shaped water stop zone having a predetermined thickness in the tunnel axis direction is formed. The water stop zone has a very high water stop because the filler is formed in a compact thickness and held in the tunnel axis direction. In addition, since the load due to the external water pressure is supported by the strong movable weir 14, the internal filler can sufficiently counter the load due to the external water pressure.
[0032]
Thereafter, the segments 3b and 3c shown in FIG. 2 in front of the water stop zone are sequentially disassembled, and the tail seal 4a exposed to the inside of the machine is replaced. Then, the disassembled segments 3b and 3c are assembled again to return to the original state. Next, a filler to be injected at the time of normal excavation having water-stopping properties is injected into a space surrounded by the tail seal 4a, the outer peripheral surface of the special segment 7 and the inner peripheral surface of the tail plate 2 through an injection pipe (not shown). A water zone is formed.
[0033]
When the above replacement work is completed, the bolt 19 constituting the diameter expansion mechanism 17 is rotated in the reverse direction to draw each movable weir block block 16 inward in the radial direction, and then normal excavation is resumed.
[0034]
Another embodiment is shown in FIG.
[0035]
As shown in the figure, in this embodiment, the interval between the movable weirs 13 and 13 is increased to increase the width of the filling chamber 27, that is, the width of the water stop zone, and a ring-like contact is applied to the inner peripheral surface of the tail plate 2. Only the point which attached the board 50 differs from previous embodiment, and others have the completely same structure. According to such a configuration, since the width of the water stop zone is widened, the water stop pressure resistance is increased, and it is possible to cope with a high groundwater pressure.
[0036]
Yet another embodiment is shown in FIG.
[0037]
As shown in the figure, in this embodiment, the movable weirs 13 and 13 are moved up and down separately, and the clogging is compression-molded into a block shape using a high molecular compound or fiber that absorbs water and expands and releases in the meantime. The material 51 is accommodated as a water stop auxiliary material. The movable weirs 13 and 13 have screw holes 52 formed therein, and move up and down by rotating screws 53 screwed into the screw holes 52.
[0038]
When water is stopped using the present embodiment, first, the movable weirs 13 and 13 are raised and the tops thereof are pressed against the contact plate 50 and the holding plate 5b, thereby forming the filling chamber 27 in a compartment. Then, a filling material having a water-stopping property or an injection material exhibiting a water-stopping property due to a chemical change after injection is injected from the injection pipe 54 into the filling chamber 27, and the clogging material 51 is expanded and released to form a water-stop zone. To do. In this way, the clogging material 51 exhibits an expansion and water-stopping effect as the filler is injected, so that not only the amount of the filler injected is reduced but also the sealing effect of the clogging material 51 and the effect of the filler. Since it is synergistic, it becomes a sure water stop zone and can cope with high groundwater pressure.
[0039]
【The invention's effect】
As described above, according to the tail seal exchanging device of the shield machine according to the present invention, when the tail seal is replaced, the water stoppage between the tail plate temporarily stopped and the existing segment is dramatically increased. be able to.
[0040]
In addition, according to the present apparatus, since the water blocking section is thin in the tunnel axial direction, it is not necessary to provide a special contact portion on the inner peripheral surface of the tail of the shield machine, so the captain of the shield machine can be extended. Since it is not necessary, it is possible to provide a shield machine with excellent curve workability, and it can also be applied to the tail seal replacement of a shield machine currently being excavated.
[Brief description of the drawings]
FIG. 1 is a side cross-sectional view of a tail seal exchange device showing an embodiment of the present invention.
FIG. 2 is a side sectional view when the tail seal exchanging device is operated.
FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1, and is a cross-sectional view of a special segment that constitutes the tail seal replacement device.
4 is an enlarged view of a main part of FIG. 3;
5 is a cross-sectional view showing a state in which the diameter of the movable weir is expanded from the state of FIG.
6 is a cross-sectional view of the movable weir shown in FIG. 4 cut in the circumferential direction.
7 is a cross-sectional view of the movable weir shown in FIG. 5 cut in the circumferential direction.
FIG. 8 is an enlarged view of a main part of FIG. 6;
9 is an enlarged view of a main part of FIG.
FIG. 10 is a side sectional view of a tail seal exchanging device showing another embodiment.
FIG. 11 is a side sectional view of a tail seal exchange device showing still another embodiment.
[Explanation of symbols]
2 Tail plate 3 Existing segment 4a Tail seal 4b to be replaced Tail seal 7 Special segment 13 Movable weir 17 Expanding mechanism 27 Space (filling chamber)
28 Inlet

Claims (2)

An apparatus for exchanging a tail seal attached to the inner peripheral surface of a tail plate of a shield machine,
A special segment that is connected to the existing segment and is located behind the tail seal that should be replaced with the excavation,
A movable weir piece provided in the special segment at a predetermined interval in the tunnel axis direction and adjacent to each other in the tunnel circumferential direction, each movable outward in the tunnel radial direction,
When each movable weir piece is moved outward in the tunnel radial direction, one end is fixed to one of the adjacent movable weir pieces to close the gap formed between the movable weir pieces adjacent in the tunnel circumferential direction. A fixed wrap whose end extends to the other side of the adjacent movable weir piece;
A diameter expansion mechanism that moves the movable weir piece outward in the tunnel radial direction and presses the tip of the movable weir piece against the inner peripheral surface of the tail plate;
A shield comprising a movable weir piece moved outward in the tunnel radial direction by the diameter expansion mechanism, an injection port for injecting a filler into a space defined by a tail plate and a special segment. Excavator tail seal replacement device. At the location where the above-mentioned special segments are adjacent to each other in the tunnel circumferential direction, toward one movable weir piece installed in one adjacent special segment, toward the other movable weir piece side installed in the other adjacent special segment The tail seal replacement device for a shield machine according to claim 1, further comprising a movable wrap movable in a circumferential direction of the tunnel.

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