JP4133731B2 - Water stop device in shield machine - Google Patents

Description

  The present invention relates to a water stop device in a shield machine, and in particular, a shield machine suitable for use in a shield tunnel joining method for joining two shield tunnels formed by excavating simultaneously from two opposite directions of a tunnel. It relates to a water stop device.

  When a shield tunnel is formed using a shield machine, it is necessary to prevent water from entering the ground into the shield machine. For example, in forming a shield tunnel, in recent years, as shield tunnels have become longer, shield tunneling machines are started from both directions of the tunnel, and two shield tunnels formed by these two shield tunneling machines are used. There is a method of joining in the ground to complete the tunnel. When joining such two shield tunnels, it is necessary to stop the water so that water does not enter the shield machine at the joining position.

  As a shield machine provided with such a water stop device, for example, there is a tunnel excavator disclosed in JP-A-11-336472. In this tunnel excavator, the first shield excavator and the second shield excavator face each other, and the cutter head mechanism of the second shield excavator is covered by an outer cylinder provided in the first shield excavator. Then, a seal mechanism is provided that stops water by pressing the seal member against the inner peripheral surface of the distal end portion of the outer cylinder by a seal jack provided in the second shield excavator.

There is also a water stop sealing device that is attached to a tail plate at the rear of the shield machine and stops the gap between the shield machine and the segment. An example of such a water sealing device is disclosed in Japanese Utility Model Publication No. 6-30958. The water-stop sealing device stands up in response to an annular flexible member that is pressurized from the outer peripheral side and expands in the radial direction as the pressurized fluid is injected, and the flexible member expands radially inward. And an annular seal ring. In this water-stop sealing device, the flexible member swells and raises the seal ring, whereby the rear end portion is pressed against the outer peripheral surface of the segment constituting the tunnel to stop the water.
Japanese Patent Laid-Open No. 11-336472 No. 6-30958

  However, in the seal mechanism in the tunnel excavator disclosed in Patent Document 1, a seal jack for pressing the seal member against the outer cylinder is provided. For this reason, there has been a problem that a certain amount of space for providing the seal jack has to be secured.

  Moreover, it is possible to use the water stop sealing apparatus disclosed by the said patent document 2 as a water stop apparatus of the junction part between shield machines. However, in the water sealing device disclosed in Patent Document 2, the flexible member is simply expanded to raise the seal ring and press it against the tunnel. For this reason, there has been a problem that the pressing force cannot be increased too much.

  Then, the subject of this invention is providing the water stop apparatus in the shield machine which can make the water stop between the exterior and inside of a shield machine high.

The water stop device in the shield machine according to the present invention that has solved the above problems is a water stop device in a shield machine that stops the water stop target gap in the shield machine, and the water stop target gap in the shield machine is , Formed between the active part and the passive part of the shield machine, and provided with a water stop member in the active part of the shield machine that is pressed by the passive part of the shield machine to stop the water stop target gap is, the active portion of the shield machine is provided with an elastic expansion member for pressing the water-shutoff member to the passive portion of the shield machine, the elastic expansion member, the expansion restricting member for restricting the expansion of the elastic expansion member The water stop member has an annular main body formed along the active part of the shield machine, and a main lip is formed at the tip of the main body. Secondary lip part consisting of ridges And it is provided.

In the water stop device in the shield machine according to the present invention, the water stop member formed in the active part of the shield machine is pressed by the passive part of the shield machine, and the shield machine and the outside are stopped. Here, an elastic expansion member that presses the water stop member is provided, and the elastic expansion member is provided with an expansion restriction member that restricts the expansion . Therefore, it is possible to inflate the elastic expansion member so as to press the water-shutoff member can be pressed against the water-shutoff member with a large force. As a result, a high water-stopping property can be exhibited. Further, by providing the main lip portion and the sub lip portion, the water stoppage by the waterstop member can be further increased.

  Here, when the inner cylinder part of the second shield machine is inserted into the outer trunk part of the first shield machine, the water stop target gap is formed between the outer trunk part and the inner cylinder part. Yes, the active part of the shield machine is provided either on the inner side of the outer body part of the first shield machine or on the outer side of the inner cylinder part of the second shield machine, and the passive part of the shield machine is the first shield It can be set as the aspect made into the other inside of the outer trunk | drum part in an excavation machine, or the outer side of the inner cylinder part in a 2nd shield excavation machine.

  When forming a shield tunnel by starting the shield machine from both directions of the tunnel with the first shield machine and the second shield machine, water stoppage at the junction of the tunnels dug by both shield machines becomes a problem. Here, in the present invention, since the active part and the passive part of the water stop device are respectively formed inside the outer cylinder part of the first shield machine and outside the inner cylinder part of the second shield machine, both shields are formed. When joining a tunnel formed by an excavator, high water-stopping performance can be exhibited.

  In addition, examples of the water stop target gap in the present invention include, for example, a tail seal part in the shield machine, in addition to the inside of the outer cylinder part of the first shield machine and the outside of the inner cylinder part of the second shield machine. it can.

In addition, it is preferable that the elastic expansion member is made of a cloth-containing rubber material having a cloth as an expansion regulating member .

By using an elastic expansion member having a cloth as an expansion regulating member , the elastic expansion member can be easily manufactured.

  Further, the main lip portion may have a lower hardness than the sub lip portion.

  Due to the low hardness of the main lip, the tip of the main lip is reliably pressed when water pressure is applied from the outside of the water-stopping member pressed with a strong pressing force, further improving water-stopping Can be.

  ADVANTAGE OF THE INVENTION According to this invention, the water stop apparatus in the shield machine which can make the water stop between the exterior and inside of a shield machine high can be provided.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each embodiment, portions having the same function are denoted by the same reference numerals, and redundant description may be omitted.

  FIG. 1 is a side sectional view of a water stop device according to an embodiment of the present invention.

  As shown in FIG. 1, the water stop apparatus 1 which concerns on this embodiment is provided with the rubber sheet 2 which is an expansion member, and the water stop seal 3 which is a water stop member. As shown in FIG. 2, the water stop device 1 is provided in the outer trunk portion 11 of the first shield machine 5. Further, a fastener 4 is provided on the outer trunk portion 11 of the first shield machine 5 which is an active part of the present invention, and the water stop seal 3 is fastened by the fastener 4, and the outer trunk portion 11. Is housed in.

  As shown in FIG. 2, the first shield machine 5 includes a first cutter device 12 provided at the distal end portion of the outer trunk portion 11. The first cutter device 12 includes a cutter part 12A and an inner cylinder part 12B that moves together with the cutter part 12A. The cutter part 12 </ b> A and the inner cylinder part 12 </ b> B can be retracted relative to the outer body part 11. An inner trunk portion 13 is provided at the rear portion of the first cutter device 12, and the inner trunk portion 13 includes a shield jack 14 that presses the segment S and takes a reaction force, and a slide connected to the outer trunk portion 11. A moving jack 15 is attached. Further, the outer trunk portion 11 is provided with a middle-folded jack 16 for swinging the outer trunk portion 11. The bent jack 16 can be replaced with a connecting rod described later.

As shown in FIG. 1, the rubber sheet 2 in the water stop device 1 includes a rubber sheet main body 21 and a cloth 22 that is an expansion regulating member . The rubber sheet 2 is disposed along the circumferential direction of the inner side surface of the outer trunk portion 11 in the first shield machine 5. In the rubber sheet main body 21, a cloth 22 is disposed over the entire rubber sheet main body 21, and the cloth 22 regulates the expansion direction when the rubber sheet 2 expands to be uniform.

  Further, as shown in FIG. 3, the water-stop seal 3 includes a plurality of plate-like core members 31 made of steel. The core material 31 is arranged slightly spaced in the circumferential direction of the outer trunk portion 11. Further, the rear end portion of the core material 31 is rotatably attached to the outer body portion 11, and the front end portion of the core material 31 tilts toward the center direction of the outer body portion 11. Yes.

  The core material 31 is covered with a rubber film 32. The rubber film 32 covers all of the plurality of core members 31 and is continuously formed along the inner peripheral surface of the outer trunk portion 11. A main lip portion 33 is formed at the tip of the rubber film 32. The main lip portion 33 is formed continuously in the circumferential direction of the outer body portion 11, and the core material 31 tilts toward the center portion of the outer body portion 11, whereby the present invention shown by phantom lines in FIG. 1. Of the second cutter machine 41 in the second shield machine 6 which is a passive part of the second cutter device 41.

  Further, an annular sub lip portion 34 made of a protrusion is provided at a position slightly rearward of the tip end portion of the rubber film 32. The secondary lip portion 34 has an annular shape with a triangular cross section, and when the core material 31 is tilted, the lower end portion of the secondary lip portion 34 is the first of the second cutter device 41 in the second shield machine 6. It contacts the inner cylinder part 41B. Further, the sub lip portion 34 is formed of the same material as the rubber film 32, and the main lip portion 33 has a lower hardness than the sub lip portion 34. The main lip portion 33 and the sub lip portion 34 abut against the inner cylinder portion 41B of the second cutter device 41, and the water stop target gap between the inside of the shield machines 5 and 6 and the outside thereof is stopped. Watered.

  The fastener 4 includes a front metal fitting 4A and a rear metal fitting 4B. Of these, the rear end portion of the water stop seal 3 is pivotally attached to the rear metal fitting 4B, so that the water stop seal 3 tilts.

  In the normal state, such as during the excavation of the shield tunnel by the first shield machine 5, the water stop device 1 is in a state where the front end portion of the water stop seal 3 is locked to the rear end portion of the front metal fitting 4A. . The rubber sheet 2 is accommodated between the water stop seal 3 and the outer body 11 in a folded state.

  Furthermore, between the rubber sheet 2 and the outer trunk | drum 11, the one end part is provided in the air tube which is not shown in figure, and the other end part of this air tube is connected to the air pump. By supplying air between the rubber sheet 2 and the outer body portion 11 through the air tube from the air pump, the rubber sheet 2 is inflated.

  Operation | movement and an effect | action of the water stop apparatus 1 which concern on this embodiment which have the above structure are demonstrated.

  As shown in FIG. 4, the first shield excavator 5 that has excavated to the first tunnel excavation position and the second shield excavator 6 that has excavated to the second tunnel excavation position face each other as a stage before using the water stop device. . Then, the shield jack 14 in the first shield machine 5 is contracted and the sliding jack 15 is extended. At this stage, a connecting rod 17 is attached instead of the bent jack. Thus, the inner body portion 13 and the first cutter device 12 are retracted, and the first cutter device 12 is accommodated inside the outer body portion 11.

  Subsequently, the second cutter device 41 in the second shield machine 5 is advanced to enter the outer trunk portion 11 of the first shield machine 5. At this time, the second cutter device 41 in the second shield machine 6 is provided with a cleaning device (not shown). By this cleaning device, the inner surface of the outer trunk portion 11 in the first shield machine 5 and the water stop device. Wash 1 The second cutter device 41 is further advanced as it is, and as shown in FIG. 5, as shown in FIG. 5, the water stopping device 1 provided in the inner cylinder portion 41 </ b> B of the second cutter device 41 and the outer trunk portion 11 of the first shield machine 5 The second cutter device 41 is stopped at the position where laps.

  When the second cutter device 41 moves forward to this position and stops, air is supplied between the outer trunk portion 11 and the rubber sheet 2 by an air pump (not shown). The amount of air supplied at this time is preferably adjusted so that, for example, the pressure applied to the rubber sheet 2 is 0.3 Mpa or more than the water pressure. When air is supplied in this way, pressure is transmitted to the water stop seal 3 and released from the state of being locked to the front metal fitting 4A, and the water stop seal 3 is rotated around the rear end portion to be opened. With the opening of the water stop seal 3, the rubber sheet 2 expands as shown by the phantom line in FIG. And the water stop seal 3 is pressed on the outer side of the inner cylinder part 41B of the second shield machine 6 by the expansion force of the expanded rubber sheet 2.

  As shown in FIG. 6B, when the water stop seal 3 is pressed against the inner cylinder portion 41 </ b> B of the second cutter device 41 in the second shield machine 6, first, the sub lip portion 34 of the water stop seal 3 is the inner cylinder. It is pressed against the portion 41B. When the water-stop seal 3 is further pressed from this state, the sub lip portion 34 is deformed, the contact area with the inner cylinder portion 41B is increased, and the water-stop performance is increased. If the pressing force is further increased as it is, the main lip portion 33 comes into contact with the inner cylinder portion 41B and is pressed. This main lip portion 33 can exhibit even higher water stopping properties. In this way, the inside of the shield machines 5 and 6 and the outside thereof are stopped by the water stop seal 3.

  At this time, in the water stop device 1 according to the present embodiment, the rubber sheet 2 having the cloth 22 disposed over the entire rubber sheet main body 21 is used. By the action of the cloth 22, the expansion direction of the rubber sheet 2 is uniformly regulated, and the water stop seal 3 can be reliably pressed against the inner cylinder portion 41 </ b> B of the second cutter device 41 in the second shield machine 6.

  Here, as a rubber sheet, a cloth sheet and a cloth sheet are compared. FIG. 6A is a schematic diagram showing a state where the water stop seal is pressed with a rubber sheet not containing cloth, and FIG. 6B shows a state where the water stop seal is pressed with a rubber sheet containing cloth. It is a schematic diagram.

  As shown in FIG. 6 (a), when the water stop seal 3 is pressed with a rubber sheet 50 without cloth, the pressing force of the water stop seal 3 is saturated with the rubber sheet 50 expanded to some extent. . Even if the rubber sheet 50 is expanded more than the state shown in FIG. 6A, the rubber sheet 50 expands in the direction of the opening between the water stop seal 3 and the outer body 11. For this reason, the pressing force for pressing the water stop seal 3 cannot be increased.

  On the other hand, as shown in FIG. 6B, when the rubber sheet 2 containing the cloth is used, the rubber sheet 2 expands evenly. The pressing force that presses the water-stop seal 3 against the inner cylinder portion 41 </ b> B by force can be increased. Therefore, the water stop seal 3 can be pressed with a strong pressing force, so that the water stop can be improved.

  Further, in the water stop device 1 according to the present embodiment, the main lip portion 33 at the tip of the water stop seal 3 has a lower hardness than the sub lip portion 34. For this reason, even if water tries to enter from the outside, higher water-stopping performance can be exhibited. This point will be described.

  FIG. 7A is a schematic diagram showing a state in which a water-stop seal whose main lip portion has high hardness (similar to the sub-lip portion) is pressed, and FIG. 7B shows that the main lip portion has low hardness. It is a schematic diagram which shows the state which pressed the water stop seal which is.

  As shown in FIG. 7A, in the water stop seal 60 in which the main lip portion 61 has high hardness, the main lip portion 61 warps after the water stop seal 60 is pressed against the inner cylinder portion 41B. For this reason, when the water stop seal 60 is pressed, if the earth and sand D are bitten, the main lip portion 61 and the inner cylinder portion 41B are separated from each other, and there is a concern that the water stoppage is lowered.

  On the other hand, as shown in FIG.7 (b), when the water stop seal | sticker 3 whose main lip part 33 is low hardness is used, the followability with respect to the mixed earth and sand D becomes high. As a result, since self-sealing property can be expected, a high water-stopping property can be exhibited.

  In this way, the outer cylinder portion 11 in the first shield machine 5 and the inner cylinder portion 41B of the second cutter device 41 in the second shield machine 6 are sealed using the water stop device 1 that exhibits high water stoppage. is doing. Accordingly, it is possible to increase the water stoppage between the outside and the inside of the shield machine 5, 6 at the joint portion between the two shield machines 5, 6.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. For example, in the said embodiment, although the water stop apparatus is provided in the outer trunk | drum part of a 1st shield machine, it can be set as the aspect which provides a water stop apparatus in the inner cylinder part of a 2nd shield machine, for example. In this case, the cleaning device is preferably provided in the outer trunk portion of the first shield machine.

  In the above embodiment, the water stop target gap between the first shield machine and the second shield machine has been described as an example. For example, a tail seal portion in the shield machine is used as the water stop target gap. You can also.

It is a sectional side view of the water stop apparatus which concerns on embodiment of this invention. It is principal part sectional drawing of a 1st shield machine. It is an expanded sectional side view of a water stop seal. It is a sectional side view which shows the joining process of a shield tunnel. FIG. 5 is a side sectional view showing a step following FIG. 4. (A) is a schematic diagram which shows the state which pressed the water stop seal with the rubber sheet which does not contain cloth, (b) is a schematic diagram which shows the state which pressed the water stop seal with the rubber sheet containing cloth. . The schematic diagram which shows the state which pressed the water-stop seal whose main lip part is high hardness, (b) is a schematic diagram which shows the state which pressed the water-stop seal whose main lip part is low hardness.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Water stop apparatus 2 ... Rubber sheet 3 ... Water stop seal 4 ... Fastener 4A ... Front metal fitting 4B ... Rear metal fitting 5 ... First shield machine 6 ... Second shield machine 11 ... Outer trunk 12 ... First cutter Device 12A ... Cutter part 12B ... Inner cylinder part 13 ... Inner trunk part 14 ... Shield jack 15 ... Sliding jack 16 ... Folding jack 21 ... Rubber sheet main body 22 ... Cloth 31 ... Core material 32 ... Rubber film 33 ... Main lip part 34 ... Sub lip 41 ... Second cutter 41B ... Inner cylinder S ... Segment D ... Earth and sand

Claims (4)

A water stop device for a shield machine that stops a gap for water stop in a shield machine,
The water stop target gap in the shield machine is formed between the active part and the passive part of the shield machine,
Pressed by the passive part of the shield machine, a water stop member that stops the water stop target gap is provided in the active part of the shield machine,
In the active part of the shield machine, an elastic expansion member is provided to press the water stop member against the passive part of the shield machine,
The elastic expansion member is provided with an expansion regulating member that regulates expansion of the elastic expansion member ,
The water stop member has an annular main body formed along the active part of the shield machine, and a main lip is formed at the tip of the main body, and protrudes from the body of the main body. A water stop device for a shield machine, characterized in that a sub lip portion comprising a strip is provided . The water stop target gap is formed between the outer body part and the inner cylinder part when the inner cylinder part of the second shield machine is inserted into the outer body part of the first shield machine. Yes,
The active part of the shield machine is provided either on the inner side of the outer trunk part of the first shield machine or on the outer side of the inner cylinder part of the second shield machine,
2. The shield machine according to claim 1, wherein the passive part of the shield machine is the other of the inside of the outer body part of the first shield machine and the outside of the inner cylinder part of the second shield machine. Water stop device. The water stop device for a shield machine according to claim 1 or 2, wherein the elastic expansion member is made of a rubber material with cloth having a cloth as the expansion regulating member . The water stop device in the shield machine according to any one of claims 1 to 3, wherein the main lip portion has a lower hardness than the sub lip portion.

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