JPH0791953B2 - Water stop device for shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water stop device in a tail portion of a shield machine,
More specifically, in the case of in-place concrete lining method, when the tunnel center (that is, the center of the inner formwork assembled into a cylinder) and the axis center of the shield machine do not coincide with each other during curve construction or meander correction, the tail The water-proof packing installed in the section and the water-proof packing installed in the press ring prevent the intrusion of groundwater from the ground reliably.

(Prior art) The cast-in-place concrete lining method in the shield construction method constructs the lining of the tunnel by placing concrete directly on the inner surface of the tunnel. The construction period can be shortened compared to the conventional construction method using segments, and it is economical. The advantage is that

However, there is no case where the cast-in-place concrete lining method was implemented in the ground where the groundwater level is high.

This is because the cast-in-place concrete lining method in the ground where high water pressure acts does not have an appropriate method for stopping the tail portion of the shield machine and is not used under such conditions.

Generally, in the new cast-in-place concrete lining method, it is necessary to create a space part by placing the press ring closer to the face than the cast place, so the water resistance capacity against the intrusion water from the outside is the smallest. This is where

Therefore, at this concrete pouring place, the rebar and the formwork are assembled, the formwork is stopped by the annular press ring, and the press work is performed by the annular press ring after placing the fresh concrete. However, when pulling the press ring from the existing concrete pouring place to the face of the face to create a concrete pouring space, groundwater invades into the new concrete pouring place from between the tail part of the skin plate and the existing concrete. However, there is a drawback that the water cannot be surely stopped.

Further, as a method of stopping the water of the tail portion of the shield machine in the cast-in-place concrete lining method, for example, Japanese Patent Laid-Open No. 53-147097 and the like are disclosed, but these are all placed at the time of propulsion of the shield machine. It is expected to have a water-stopping effect on concrete that has not solidified yet, and it cannot be said that it has a highly reliable water-stopping capability in terms of practical use.

(Problems to be Solved by the Invention) In the prior art, since it is expected that the concrete that does not solidify when the shield machine is propelled will have a water-stopping effect, the press ring is pulled closer to the face of the face than the place where the press is placed. When creating a casting space, there was a problem that groundwater could not be surely stopped because the groundwater entered between the tail portion of the skin plate and the existing concrete to a new concrete casting location.

In particular, during curve construction and meandering correction, the shield excavator is forced to correct its direction by overexcavation, so the center of the tunnel axis direction, that is, the center of the inner formwork assembled in the cylindrical shape and the axis of the shield excavator. The centers do not coincide with each other, so that the distance between the inner peripheral surface of the tail and the outer peripheral surface of the inner mold differs in the front-rear direction or the left-right direction in the tunnel axis direction. In this case, it was impossible for the conventional press ring to stop the water in response to such a positional relationship.

The present invention has been made in view of the above problems, and an object thereof is to stop water in the tail portion of a shield machine even under ground conditions with a high groundwater level or when the inner formwork meanders. Is effective.

(Means for Solving the Problem) The gist of the water stop device of the shield machine for solving the above problems is that the first water seal packing is a hollow tube provided on the inner circumference of the tail portion of the shield machine and is expandable and contractible. And a second water blocking packing provided on the inner circumference and the outer circumference of the annular press ring at the rear end of the press jack.
And a device for stopping the tail portion of the shield machine by the joint action of the second water blocking packing, wherein the press ring is divided into an inner press ring and an outer press ring so as to overlap each other, A plurality of hydraulic jacks are inserted between these inner and outer press rings to make them movable in the radial direction of the tunnel, and endless water-stop packings are provided on the inner circumference of the inner press ring and the outer circumference of the outer press ring, respectively. Is provided to form the second water blocking packing, the inner and outer press rings are circumferentially divided into a plurality, and the second water blocking packing is an endless elastic packing, and The inner press ring is circumferentially divided into a plurality of pieces, the hydraulic jack is inserted into the outer press ring, and the second water blocking packing is endless. Is that with reduced freely hollow packing.

(Operation) The present invention takes the reaction force of the shield machine to the inner formwork and propels it by one ring by the propulsion jack, and then expands the tube on the inner circumference of the tail portion to cause a gap between the existing concrete and the skin plate. Water is stopped and the press ring is pulled forward by one ring to form a new concrete placing space.

Then, reinforcing bars are laid in this concrete placing space to assemble the inner formwork, and the press ring is pushed out rearward again to fix the girder between the skin plate of the tail part and the inner formwork by the press ring.

Next, by operating the hydraulic jack, the inner and outer press rings are individually moved by the hydraulic jack, and the second water blocking packing is pressed against the skin plate side and the inner frame side of the tail portion to stop water.

Thereafter, fresh concrete is poured into this new concrete casting space, and when the concrete exhibits a predetermined strength, the tube on the inner circumference of the skin plate is contracted to propel the shield machine.

As described above, according to the present invention, the shield machine is surely stopped by the joint action of simultaneously or alternately operating the first water blocking packing and the second water blocking packing according to the process. You can

When the inner and outer press rings are pressed to the skin plate side and the inner mold frame side by the operation of the hydraulic jack, at least the inner press ring is divided in the circumferential direction to prevent the tunnel from moving in the radial direction. You can smoothly adjust the distance between the skin plate and the inner mold.

In addition, by making the second water-proof packing a hollow packing that can be expanded and contracted, between the inner press ring and the inner mold,
It is possible to surely stop water according to the clearance between the external press ring and the skin plate.

(Example) Hereinafter, one example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an axial sectional view of a water shut-off device in the first embodiment, and FIG. 3 is a vertical sectional view of FIG.

The water stop device of the shield machine of the present invention is a skin plate 6
It is composed of a first water-tight packing with a expandable / contractible tube 10 provided at the tail portion of the press ring and an elastic endless second water-tight packing 5 provided on the inner and outer circumferences of the press ring 1. .

The press ring 1 is divided into an inner press ring 41 and an outer press ring 31, and each is divided into a plurality of pieces in the circumferential direction and connected by pins.

The inner and outer press rings 41 and 31 are made of an angle material and are formed so as to overlap each other.

The vertical surface 1a of the angle member is used as a pressing surface, and the cylinder 4a of the hydraulic jack 4 built in the rear portion of the cylinder 3 of the press jack 2 is fixed to the horizontal surface 1b.

Therefore, when the hydraulic jacks 4 are actuated to expand the press rings 41, 31 inside and outside in the radial direction of the tunnel, the endless water-stop packing 5 causes the skin plate 6 at the tail portion.
And the inner formwork 7 are pressed.

On the other hand, the first water blocking packing 10 is installed in an annular recess 9 formed on the entire inner surface of the tail portion of the skin plate 6 and is fixed by a plate 11 and a bolt 12 to which a fluid hose 13 is connected. .

Then, by pumping a fluid to the tube 10 to expand it, water can be stopped between the skin plate 6 and the existing concrete 50.

As described above, the action and effect of the first water blocking packing solves the problem that the inner surface of the skin plate 6 is likely to become a water line because the existing concrete shrinks as it hardens after being placed.

The operation method of this water stop device will be described below.

First, when forming a new concrete pouring space,
After the shield machine 8 receives a reaction force from the inner formwork 6 and is propelled by the press jack 2 for one ring, the tube 10 is expanded to stop the water between the existing concrete and the skin plate 6.

Then, the press jack 2 is pulled back by one ring to form a concrete placing space, and then a reinforcing bar is laid in the concrete placing space to assemble the inner formwork 7.

Then, the annular press ring 1 provided at the rear end of the press jack 2 is pushed out backward again to fix the press ring between the skin plate 6 of the tail portion and the inner formwork 7, and then the hydraulic jack 4 is used to The inner and outer press rings 41 and 31 divided in the circumferential direction are individually moved to make the endless water-stop packing 5 on the skin plate 6 side of the tail portion and the inner form frame 7.
Press it to the side to stop the water.

Since the inner and outer press rings 41 and 31 are divided in the circumferential direction in this manner, they are separated between the inner formwork 7 and the skin plate 6 in accordance with the amount of eccentricity from the tunnel axis of the shield machine 8. It is possible to adjust the clearance with the inner formwork 7 because it can be installed in the.

FIG. 2 is an axial sectional view of a water shutoff device for a shield machine according to a second embodiment, FIG. 4 is a longitudinal sectional view of FIG. 2, and FIG. 6 is an enlarged sectional view of a main part.

The water stop device in the second embodiment is similar to that in the first embodiment.
A first water-tight packing with a expandable and contractible tube 10 provided in the tail portion of the skin plate 6, and a hollow, expandable and endless second water-tight packing 16 provided on the inner and outer circumferences of the press ring 1, Formed with 19 and. A fluid hose 15 is connected to the second water blocking packings 16 and 19.

The press ring 1 is divided into a press ring 17 inside and a press ring 14 outside, and the ends thereof are overlapped.

Further, the press ring 17 inside is divided along the circumferential direction and is connected by a pin.

There is also a hydraulic jack between the inner and outer press rings 14 and 17.
20 is provided, and the cylinder 20a has a press ring 1 inside.
It is attached to 7.

Therefore, the hydraulic jacks 20 are actuated to expand the press rings 14 and 17 inside and outside to the inner formwork 7 side and the skin plate 6 side, and at the same time, the water blocking packings 16 and 19 are connected to the fluid hoses 15 and 18, The water is stopped by expanding it by pumping.

The tube 10 at the tail portion of the skin plate 6 of the shield machine 8 has the same structure as that of the first embodiment.

The water shut-off device of the second embodiment is operated according to each construction process as in the first embodiment.

In this case, since the internal press ring 19 is divided in the circumferential direction, these are installed between the inner formwork 7 and the skin plate 6 according to the amount of eccentricity from the tunnel axis of the shield machine 8. Therefore, the clearance with the inner frame 7 can be adjusted.

(Effects of the Invention) The present invention having the above-described configuration has the following effects.

In the cast-in-place concrete lining method of the shield construction method at high water pressure at a large depth in the ground or at high water pressure at a relatively low depth, it is possible to reliably stop the water in the tail portion of the shield machine.

By dividing the press ring into the inside and outside, and at least dividing the press ring inside into the circumferential direction, even if the space between the inner formwork and the skin plate changes, the concrete pouring space is completely sealed accordingly. Therefore, it is possible to surely stop the water of the shield machine even at the time of curving or correcting meandering.

[Brief description of drawings]

1 is an axial sectional view of a water stop device in a tail portion of a shield machine in the first invention, FIG. 2 is an axial sectional view of a water stop device in a tail portion of a shield machine in a second invention, 3 is a vertical sectional view of FIG. 1, FIG. 4 is a vertical sectional view of FIG. 2, FIG. 5 is an axial sectional view for explaining the entire apparatus, and FIG. 6 is a mode of FIG. It is a partially expanded longitudinal cross-sectional view corresponding to. In the figure, 1, 14, 17 ... Press ring, 2 ... Press jack, 3 ...
Rod, 4, 20 ... hydraulic jack, 4a, 20a ... rod,
5, 16, 19 ... Water-proof packing, 6 ... Skin plate, 8 ...
Shield machine, 13, 15, 18 ... Fluid hose.

Claims (3)

[Claims] 1. A first water-stop packing made up of an expandable and contractible hollow tube provided on the inner circumference of the tail portion of a shield machine, and a second water stop provided on the inner and outer circumferences of an annular press ring at the rear end of the press jack. A device for stopping the tail portion of a shield machine by the joint action of the first and second water blocking packings, the device including a water packing, and an internal press ring so that the press rings overlap each other. It is divided into an outer press ring, and a plurality of hydraulic jacks are inserted between these inner and outer press rings to make them movable in the radial direction of the tunnel, and the inner circumference of the inner press ring and the outer press ring. A water shut-off device for a shield machine, characterized in that endless water shut-off packings are provided on the outer circumferences respectively to form the second water shut-off packing. 2. The shield machine according to claim 1, wherein the inner and outer press rings are divided into a plurality of pieces in the circumferential direction, and the second water blocking packing is an endless elastic packing. Water stop device. 3. The inner press ring is circumferentially divided into a plurality of parts, the hydraulic jack is inserted into the outer press ring, and the second water-stop packing is an endless hollow expandable / retractable packing. 2. The method according to claim 1, wherein
Water stop device for shield machine as described in.