JP3840772B2 - Emergency water seal device for shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an emergency water stop seal device for a shield machine.
[0002]
[Prior art]
In a shield machine that digs underground, a tunnel is constructed by assembling segments in the trunk. At this time, there is a gap between the outer peripheral surface of the segment (tunnel) and the inner peripheral surface of the rear trunk, and this clearance is called tail clearance. Groundwater and earth and sand enter the shield machine from this tail clearance. In order to prevent this, a tail seal device is provided on the rear trunk of the shield machine.
[0003]
However, the tail brush of the tail seal device installed in the rear trunk is damaged when excavated for a long distance, and the water stop function is lowered. For this reason, if the tail brush is left as it is without being replaced, groundwater or earth and sand will enter the machine, and the segments cannot be assembled safely. In addition, when the water stop function of the tail brush is lowered, ground water and earth and sand enter from the tail clearance, so that the tail brush replacement operation itself cannot be performed safely.
[0004]
As an apparatus for solving this problem, for example, there is an emergency water stop seal apparatus shown in FIG. Hereinafter, the structure of the conventional emergency water stop sealing apparatus is demonstrated based on FIG. FIG. 8 shows a part of the rear trunk portion of the shield machine in a cross section along its axis. 40 is an outer shell of the rear trunk portion, and 41 is an emergency water stop seal installed on the inner surface of the outer shell 40. Device. The emergency water stop seal device 41 has a structure in which the front end side of the rubber seal packing 42 is fixed to the inner surface of the outer shell 40 and the rear end side of the seal packing is held by a holding metal fitting 43. A seal packing push-out device 44 made of a rubber tube is provided on the upper surface side of the seal packing 42.
[0005]
The operation of the conventional emergency water stop seal device 41 will be briefly described. At the time of normal excavation, as shown in FIG. 8, the rear end side of the seal packing 42 is held by the holding metal fitting 43, and the seal packing 42 is kept substantially parallel to the inner surface of the outer shell 40.
[0006]
And when using the emergency water stop seal device 41, such as when replacing the tail brush of the tail seal device, by injecting the pressure liquid into the tube of the seal packing push-out device 44 and expanding the tube, The seal packing 42 is pushed downward. Then, the rear end of the seal packing 42 comes off from the holding metal fitting 43, and the rear end side of the seal packing 42 comes into contact with the surface of the segment 46 as shown in FIG. 9. Thus, since the tail clearance is almost surely temporarily sealed, the tail brush installed on the inner side of the emergency water stop seal device 41 during this time can be safely replaced.
[0007]
[Problems to be solved by the invention]
By the way, since an emergency water-stop seal needs to exhibit a water-stop function reliably and promptly in an emergency, a rubber-like packing having higher water-stop performance than a wire brush generally used as a tail brush is used. However, the rubber packing is strongly affected by friction caused by sliding and has low durability, so that when it is slid for a long time, the water-stopping function is deteriorated immediately.
However, the conventional emergency water stop sealing device described above is a structure that only pushes inward, and because it has a self-sealing effect due to external pressure, once it functions, it will continue to slide without leaving the segment outer surface, It wears out quickly and does not perform its sealing function. For this reason, the conventional emergency water stop seal device can be used only for one tail brush replacement in practice.
[0008]
Further, for example, Japanese Patent Laid-Open No. 6-146776 discloses a multi-shield shield machine that widens the main body of the shield machine when it is desired to change the cross section of a part of the tunnel during the excavation.
10 and 11 schematically show the structure of the tail portion of the shield machine disclosed in the publication, FIG. 10 is a front view of the rear end portion, and FIG. 11 is an operation explanatory view.
In the figure, reference numeral 50 denotes a central block of the rear trunk portion, and 51 and 52 denote moving blocks installed on the left and right of the central block 50 so as to be movable in the width direction. Reference numerals 50a, 51a and 52a denote tail seals installed on the inner peripheral surfaces of the central block 50 and the moving blocks 51 and 52, respectively. The tail seals 50a, 51a, 52a abut against the outer peripheral surface of the segment constructed in the rear trunk portion, and prevent dirt and the like from entering the inside of the shield machine from the tail clearance.
[0009]
By the way, when the moving blocks 51 and 52 move in the width direction, a gap is generated between the central block 50 and the moving blocks 51 and 52 as shown in FIG. In some cases, it is necessary to consider the gap at the time of widening in the emergency water stop sealing device at the time of widening.
[0010]
However, the conventional emergency water stop sealing device shown in FIGS. 8 and 9 does not assume the case where the rear trunk portion of the shield machine is widened and cannot be applied to the wide type shield machine. .
[0011]
The present invention has been made to solve such a problem, and firstly, an object thereof is to obtain an emergency water stop seal device that can be used repeatedly over and over. A second object of the present invention is to obtain an emergency water stop sealing device that can be applied to a widening type shield machine.
[0012]
[Means for Solving the Problems]
The emergency water stop sealing device according to the present invention is configured such that the proximal end side is installed on the inner surface of the rear trunk portion of the shield machine, the distal end side is configured to be rotatable about the proximal end side, and pressure liquid can be injected. It consists of a seal packing with a pressure fluid injection part,
By rotating the pressure liquid injecting liquid into the pressure liquid injection part, it can be rotated to secure a gap between the segments, and by discharging the pressure liquid from the pressure liquid injection part, it is in the opposite direction to that during the pressure injection It is configured to be able to rotate and seal the gap with the segment.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 5 is an explanatory view of an embodiment of the present invention, and is a perspective view of a portion A in FIG. 11 showing a rear trunk portion of the wide-width type shield machine, and FIG. 6 is an explanation showing a part of FIG. FIGS. 7 and 7 are cross-sectional views taken along the line BB in FIG. First, based on FIG. 5 thru | or FIG. 7, the relationship between the center block 50 and the movement block 51 in this Embodiment is demonstrated.
[0016]
A step portion 50b that protrudes toward the inner surface is formed at the side end portion of the central block 50, and further, a deep groove portion 50c into which a part of the moving block 51 is inserted and the rear side of the step portion 50b. A shallow groove portion 50d is formed. Moreover, the convex part 51b which protrudes to the center block 50 side is formed in the side edge part of a movement block (refer FIG. 6). Then, the end of the moving block 51 and the end of the central block 50 overlap each other, and the convex portion 51b of the moving block 51 is inserted into the deep groove 50c of the central block 51. In this state, the moving block 51 moves to the central block 50. On the other hand, it is configured to be movable in the width direction.
[0017]
FIG. 1 is a view showing a main part in a state viewed from the direction of arrow C in FIG. Next, the structure of the principal part of this Embodiment is demonstrated based on FIG.
In the figure, 1 is a first seal packing installed on the inner surface of the central block 50, and 20 is a second seal packing attached to a moving block 51. Here, the structure of the 1st seal packing 1 and the 2nd seal packing 20 is each demonstrated based on FIG.3 and FIG.4 which show the center block 50 and the movement block 51 separately.
[0018]
First, the first seal packing 1 will be described with reference to FIG. The first seal packing 1 has a belt-like shape extending in the width direction of the shield machine, the base end side of which is installed on the rear side wall of the deep groove 50c, and is inclined rearward (of the shield machine) It is installed in a state. The 1st seal packing 1 is formed from elastic members, such as rubber | gum, and the steel plate 3 for inversion prevention is installed in the lower surface side of the inclination part. Moreover, the front-end | tip part 1a of the 1st seal packing 1 is bent in the horizontal direction, and is comprised so that a contact area with the segment which is not shown in figure may become large.
[0019]
The first seal packing 1 is inclined to the rear side as shown in FIG. 3 when no external force is applied. However, since the first seal packing 1 is formed of an elastic member, a force is applied from below to above. In such a case, a substantially horizontal state can be obtained as shown in FIG.
5 is a water-stopping packing installed on the inner surface of the central block 50, and prevents infiltration of groundwater from the gap between the inner surface of the central block 50 and the convex portion 51b of the moving block 51.
[0020]
Next, the second seal packing 20 will be described with reference to FIG. The second seal packing 20 has a structure in which an elastic member is formed in a tube shape, and the upper side of the front half of the elastic member constituting the tube is installed on the lower surface side of the convex portion 51b of the moving block 51. . Further, in a natural state where no external force is applied, the second seal packing 20 is configured so that the rear half is inclined toward the rear as shown in FIG. As shown in FIG.
[0021]
A steel plate 21 for preventing inversion is provided inside the inclined portion. In addition, a horizontal surface portion 20a that is horizontal in the natural state is formed at the distal end portion on the rear side of the second seal packing 20. A hollow portion 20b is formed on the inner side of the horizontal surface portion 20a. By providing the hollow portion 20b, the horizontal surface portion 20a can be brought into close contact with the contact surface (the surface of the segment).
[0022]
Here, the basic function of the second seal packing 20 will be described. The second seal packing 20 has a tube shape as described above, and is configured such that a liquid can be injected under pressure into the pressure liquid injection portion 20d, which is an internal space of the tube, and can be discharged. When the liquid is pressurized and injected into the pressure liquid injection part 20d, the tube expands and the lower tube extends, so that the inclined part is in a horizontal state as shown in FIG. Note that when the pressure liquid is injected into the pressure liquid injection part 20d, the lower part of the tube swells downward so that the inclined part cannot be made horizontal, so that this lower part does not swell to the lower part of the tube. You may make it provide a thing like an address board. When the liquid in the pressure liquid injection part 20d is discharged, the second seal packing 20 returns to the inclined state as shown in FIG.
[0023]
FIG. 2 is an explanatory diagram for explaining the operation of the present embodiment. The operation of this embodiment will be described below with reference to FIGS.
During normal excavation, as shown in FIG. 1, the pressure liquid is injected into the pressure liquid injection portion 20 d of the second seal packing 20 to bring the second seal packing 20 into a horizontal state. 1 The seal packing 1 is lifted and kept in a substantially horizontal state. In this state, both the first seal packing 1 and the second seal packing 20 are separated from the surface of the segment 46. In this state, excavation is carried out while preventing groundwater and earth and sand from entering the machine from the tail clearance by a tail brush (not shown) installed before and after the first seal packing 1 and the second seal packing 20.
[0024]
Next, when the tail brush needs to be replaced, the liquid in the pressure liquid injection part 20d of the second seal packing 20 is discharged. Thereby, the lower surface side of the tube of the second seal packing 20 is contracted, and as shown in FIG. 2, it returns to the inclined state which is a natural state. At this time, the force from the second seal packing 20 does not act on the first seal packing 1 and returns to the inclined state, which is the natural state, like the second seal packing 20. In this natural state, as shown in FIG. 2, the tips of the first seal packing 1 and the second seal brush 20 come into contact with the surface of the segment 46. This ensures that the tail clearance is sealed.
[0025]
The tail brush is exchanged in the state shown in FIG. When the replacement operation is completed, the first seal packing 1 and the second seal packing 20 are brought into the state shown in FIG. 1 by again injecting the liquid into the pressure liquid injection part 20d of the second seal packing 20 under pressure. Accordingly, since the first seal packing 1 and the second seal brush 20 are not in contact with the surface of the segment thereafter, the first seal packing 1 and the second seal packing 20 are not worn even when the digging is performed. Therefore, it can be used any number of times.
[0026]
Next, the operation of the first seal packing 1 and the second seal packing 20 when the moving block 51 moves (when the shield machine is widened) will be described. As shown in FIG. 1, the first seal packing 1 and the second seal packing 20 are in contact with the inversion prevention plate 3 installed on the lower surface of the first seal packing 1 and the upper surface of the second seal packing 20. As shown in FIG. 6, the second seal packing 20 is installed on the lower surface of the moving block 51 (including the lower surface of the convex portion 51b). When the shield machine is in the reduced width state, the second seal packing 20 and the first seal packing 1 The two-seal packing 20 has many overlapping portions.
[0027]
And when widening a shield machine, the 1st seal packing 1 and the 2nd seal brush 20 slide, and the part which both overlaps decreases. In this case, the 1st seal packing 1 and the 2nd seal packing 20 are the structures which the inversion prevention board 3 and the 2nd seal packing 20 of the lower surface of the 1st seal packing 1 contact | abut, and can slide smoothly. Even when the shield machine is widened by the maximum amount, the first seal brush 1 and the second seal packing 20 partially overlap each other. Therefore, even when widening, the first seal packing 1 and the second seal packing 20 are overlapped. There is no gap between the tail clearance and the tail clearance can be reliably sealed. In addition, since there are overlapping portions, the first seal brush 1 can be operated by moving the second seal packing 20 by pressurizing and injecting liquid into the pressure liquid injection portion 20 d of the second seal packing 20.
[0028]
In the above embodiment, the emergency seal device for the widening type shield machine has been described. However, in the case of a normal shield machine without a widening mechanism, only the second seal packing 20 is installed. Thus, an emergency water stop seal device can be configured.
[0029]
【The invention's effect】
As described above in detail, in the present invention, a pressure can be secured between the segment by rotating the seal packing by pressurizing and injecting liquid into the pressure liquid injection section. Since the tail clearance can be sealed by rotating the seal packing in the opposite direction by discharging the liquid, the seal packing can be brought into contact with the segment only when necessary, and the wear of the seal brush Therefore, the emergency water stop seal can be used over and over again.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram for explaining a main part of an embodiment of the present invention.
FIG. 2 is an operation explanatory diagram of the embodiment shown in FIG. 1;
FIG. 3 is an explanatory diagram for explaining a part of the embodiment shown in FIG. 1;
FIG. 4 is an explanatory diagram for explaining a part of the embodiment shown in FIG. 1;
FIG. 5 is a perspective view illustrating an embodiment of the present invention.
6 is a perspective view showing a part of FIG.
7 is a cross-sectional view taken along line BB in FIG.
FIG. 8 is an explanatory diagram of a conventional emergency water stop seal device.
FIG. 9 is an operation explanatory diagram of a conventional technique.
FIG. 10 is a view of a rear trunk portion of the wide type shield machine.
FIG. 11 is a view showing a widened state of a rear trunk portion of the widening type shield machine.
[Explanation of symbols]
1 First seal packing 20 Second seal packing 50 Central block 51 Moving block

Claims (1)

The proximal end side is installed on the inner surface of the rear trunk portion of the shield machine, and the distal end side is configured to be rotatable about the proximal end side as a fulcrum. The seal packing includes a pressure liquid injection portion that can inject pressure liquid. Emergency water seal device,
By rotating the pressure liquid injecting liquid into the pressure liquid injection part, it can be rotated to secure a gap between the segments, and by discharging the pressure liquid from the pressure liquid injection part, it is in the opposite direction to that during the pressure injection An emergency water stop sealing device for a shield machine, which is configured to rotate and seal a gap with a segment.

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