JPS6053233B2 - Segment ring flexible waterproof fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flexible waterproof joint for segment rings in segment assembly pipes installed in relatively soft ground such as Quaternary strata by the SHIELDER method.

When burying conduits, etc. that accommodate power cables, communication cables, etc. underground, structures are densely packed on the ground in or near cities, so burying conduits using open-cut methods may cause traffic obstruction, noise, etc. Significantly degrade the surrounding environment.
For this reason, in recent years, the shield method, which has relatively little impact on the surrounding environment, has often been adopted. The shield method is a construction method in which a face is excavated by a shield machine and segments are assembled in the tail of the shield machine to construct an underground conduit, that is, a shield tunnel. This is a well-known construction method that is often used when constructing shield tunnels in soft ground with abundant groundwater, such as in the ground.

On the other hand, in the case of soft ground as mentioned above, when an earthquake occurs, the seismic waves are amplified compared to hard ground and a large displacement occurs in the ground. Since the behavior of shield tunnels with relatively small and long cross sections during earthquakes is mainly controlled by the movement of the surrounding ground, shield tunnels are also greatly affected by ground movement.

In addition, shield tunnels constructed in unevenly settling ground, such as consolidated ground represented by a soft and weakly viscous upper layer, are also greatly affected by the uneven settling of the ground. A shield tunnel is constructed by connecting segment rings arranged in series with connecting bolts, so the effects of displacement in the longitudinal direction of the tunnel due to earthquakes or uneven ground subsidence, etc. will not affect the segments. This is most noticeable at joints between segment rings, where the rigidity is weak compared to the rings themselves, and gaps and differences in joints between segment rings occur due to breakage of connecting bolts, etc., and groundwater inflow into pipes. , the original function as a shield tunnel will be significantly degraded.

Conventionally, as a countermeasure against earthquakes or uneven ground subsidence in shield tunnels, a construction method has been adopted in which special segments that can tolerate displacement are manufactured using stainless steel, rubber, etc., and the special segments are installed in a part of the shield tunnel. However, this method has the following drawbacks. (1) Special segments are significantly more expensive than general segments and have a complicated structure, making them difficult to construct.

(2) Since it is difficult to accurately grasp the range and form of uneven ground subsidence, it is difficult to set the appropriate locations for installing special segments, and if they are installed with safety in mind, the number of locations will increase. Expenses increase.

(3) In order for the shield tunnel to follow the movement of the ground during an earthquake, it is effective to be able to tolerate displacement at the joints of each segment ring, but in this case, the number of locations for installing special segments will increase significantly. , it costs a lot of money.

This invention eliminates the above-mentioned drawbacks, allows the joint between segment rings to be freely displaced, does not allow underground water etc. to flow into the tunnel, and is safe and economical in preventing earthquakes and earthquakes. The object of the present invention is to provide a flexible waterproof joint for a segment ring to prevent subsidence.

Next, the present invention will be explained in detail using illustrated examples.

Figures 1 to 5 show a first embodiment of this invention. The lower steel segment 10, the upper steel segment 11, and the steel key segment 12 are connected to a plate-like frame member 13 at the circumferential end of the tunnel and a flange 14 at the longitudinal end of the tunnel. A frame member 15 having an L-shaped cross section and a skin plate 16. The frame members 13, 15
are provided with through holes 17, 2 for insertion of connectors, and the frame member 13 at the end in the circumferential direction of the tunnel in each of the segments 10, 11, 12 arranged in a circular manner is inserted into the through hole 17 and is a bolt/nut (not shown). omitted) to form a segment ring 1.

A connecting tool 3 made of a bolt is inserted across the through hole 2 of the frame member 15 at the longitudinal end of the tunnel in adjacent segment rings 1, and a gap 4 is provided between the connecting tool 3 and the through hole 2. , and the connector 3 includes a water stop ring 5 made of an elastic material made of a rubber O-ring that comes into contact with the inner surface of each frame 15, a water stop ring holding member 6 in the shape of a circular box, and a helical spring. The presser spring 7 and the presser member presser washer 18 are fitted, and the presser spring 7 and the water stop ring 5 are compressed by the tightening force of the tightening member 8 consisting of a nut screwed onto the connector 3. The water stop ring 51 is compressed by the tightening force of the nut 8 in the annular space formed by the inner surface of the frame member 15, the circular box-shaped water stop ring holding member 6, and the connector 3, and the frame stop 15 is compressed by the tightening force of the nut 8. It is strongly pressed against the inner surface and the periphery of the connector 3.

An annular water stop material 9 made of an elastic material such as rubber and having a groove-shaped section in the middle is fitted inside a cylindrical portion formed by a flange 14 of a frame member 15 in an adjacent segment ring 1, and is fitted at one end. A thin end portion 1 having a thickness of 112 times the thickness of the intermediate portion on the inner surface side and the outer surface side of the other end.
A large number of arc-shaped tightening washers 21 having numbers 9 and 20 are arranged side by side along the inner surfaces on both sides in the width direction of the annular water stop material 9, and adjacent thin end portions 19 and 20 are arranged in parallel in the tunnel circumferential direction. The side portions of the annular water stop material 9, each flange 14, and each tightening washer 21 are superimposed on each other so as to be able to slide, and the side portions of the annular water stop material 9, each flange 14, and each tightening washer 21 are connected to a large number of bolts 22 and Each segment ring 1 and the annular water stop material 9 are connected watertightly by nuts 23, and bolt insertion holes 24 in the tightening washers 21 are elongated holes extending in the circumferential direction of the tunnel.

6 to 8 show examples of displacement of the anti-flexibility joint of the first embodiment. In the case of FIG. 6, adjacent segments are separated from each other, and in the case of FIG. In the case of Fig. 8, the inner peripheries of adjacent segments are bent so that the inner peripheries are in contact and the outer peripheries are separated. In either case, the space between the frame member 15 of the segment and the connector 3 is maintained in a water-stop state by a water-stop ring 5, and the space between adjacent segment rings 1 is kept in a water-stop state by an annular water-stop member 9. It will be done. FIG. 9 shows a second embodiment of the present invention, showing the head of the connector 3, the nut 8, and each frame member 15.
A water stop ring 5, a water stop ring holding member 6, a pressing spring 7, and a pressing member holding washer 18 are fitted between the water stop ring 5, a water stop ring holding member 6, a pressing member holding washer 18, and the other configurations are the same as those of the first embodiment.

FIG. 10 shows a third embodiment of the present invention, in which
The inner circumferential side portion and the outer circumferential side portion of the frame member 15 of the segments adjacent in the tunnel longitudinal direction are connected to the connecting tool 3, respectively.
, water stop ring 5, water stop ring pressing member 6, pressing spring 7,
Although the pressing member is tightened and connected by a washer 18 and a nut 8, the other configurations are the same as in the first embodiment.

FIG. 11 shows a fourth embodiment of the invention,
A box-shaped concrete segment is used as each of the segments 10, 11, 12, and an insert 25 having a screw hole is embedded and fixed in the inner circumferential side of the frame material 15 without a flange, and an annular water stop material mounting bolt is used. 22 is screwed into the insert 25, but the other configurations are the same as in the first embodiment. 12 to 15 show a fifth embodiment of the present invention, in which each of the segments 10, 11, 12 is constructed of a concrete segment main body 2.
6, a steel box 27 buried on both sides of the segment body 26 in the tunnel longitudinal direction, and an anchor member 2 for fixing the box 27 to the segment body 26.
8, and a through hole 2 for insertion of a connector is provided in the side plate at the longitudinal end of the tunnel in the box 27, and a segment 1 adjacent in the longitudinal direction of the tunnel is provided.
The side plates of the box 27 at 0, 11, and 12 are connected by the same means as in the first embodiment, and the bolt 22 for attaching the annular water stopper 9 is a screw of the insert 25 embedded and fixed in the segment main body 26. It is screwed into the hole.

FIG. 16 shows a sixth embodiment of this invention,
A flange 29 is integrally provided on the side plate of the tunnel longitudinal end in the box 27, and the annular water stop material 9 is attached to the flange 29 by the same means as in the first embodiment, but other configurations are used. is the same as in the fifth embodiment.

When carrying out this invention, in order to increase the water pressure strength of the annular water stop material 9, as shown in FIG.
A large number of reinforcing metal wires 30 extending in the width direction of the annular water stop material may be buried at intervals in the longitudinal direction of the annular water stop material, or a reinforcing metal mesh material may be buried in the middle part of the annular water stop material. Alternatively, a reinforcing metal wire extending in the circumferential direction of the annular water stop material or any other reinforcing material may be buried. As shown in FIG. 17, the middle part of the annular water stop material 9 may have a corrugated cross section.
Furthermore, on the outer peripheral surface of both sides of the annular water stop material 9 in the width direction,
A water stop ridge 31 may be provided that extends continuously in the circumferential direction.

As shown in Figure 1"8, the annular water stop material mounting bolt 22
may be screwed into a screw hole provided in the flange 14 of the frame member 15. As the water stop ring holding member, a flat washer or other arbitrary shape may be used, and the annular water stop material may have a straight cross section, and the annular water stop material mounting bolt 2 may be used.
The nut 23 into which the parts 2 are screwed together may be fixed to the flanges 14 and 29 in advance by spot welding or the like.

Cast iron segments may be used as segments;
Further, as the elastic pressing member, a rubber block or a material obtained by integrally laminating and molding rubber and a metal plate may be used.

When using an O-ring as the water stop ring 5, the radius of the cross section of the O-ring is determined by the diameter of the through-hole 2 for connecting the connector 3 and the diameter of the connector 3.
The diameter is set to be larger than the difference between the diameter of the

If the radius of the cross section of the O-ring is set in this way, even if the connector 3 is deviated so as to contact the wall surface of the through hole 2, the frame member 1
5 and the side plate of the box 27, the O-ring can be kept in contact with the entire inner circumference surrounding the through hole 2.

This invention is basically most suitable for flexible waterproof joints of segment rings in shield tunnels that do not require a secondary lining, such as shield tunnels that accommodate power cables, communication cables, etc. A secondary lining may be applied if necessary.

19 and 20 show a state in which a secondary lining has been applied to a tunnel having a flexible waterproof joint according to the first embodiment, and in the case of FIG. At the end of the connector 3, an elastic pressing member 7, a water stop ring holding member 6 on both sides thereof, a pressing member holding washer 18, and a water stop ring 5 are attached.
Also, the bottom plate of a comb or metal covering box 32 covering the tightening member 8 is inserted, and the covering box 32 is fixed by a locking nut 33 screwed onto the connector 3, and then facing the segment ring joint part. A rubber elastic water stop material 34 is placed at the position, and a secondary lining concrete 35 is placed.
is poured. In the case of FIG. 20, the metal material covering the presser spring 7, the water stopper ring presser member 6 on both sides thereof, the waterstop ring 5, the presser member presser washer 18, the tightening member 8, and the distal end portion of the connector 3 is used. The covering box 32 is the frame material 1
5 is fixed by spot welding, and then secondary lining concrete 35 is poured.

In the case of the fifth embodiment, the box 27 is
Since the opening of the box is covered, when placing secondary lining concrete, the annular water stop material 9 can prevent concrete from entering into the box. According to this invention, the through hole 2 for insertion of a connector is provided in the connecting portion of the segment ring 1 that does not protrude outside the segment ring but projects inside the segment ring at the end in the tunnel longitudinal direction. Connecting parts of adjacent segment rings 1 are joined to each other, and a connecting tool 3 is inserted across the through hole 2 of each connecting part, and a gap 4 is provided between the connecting tool 3 and the through hole 2. The connector 3 includes a water stop ring 5 made of an elastic material that is pressed against the inner surface of each connector and the outer peripheral surface of the connector 3, a water stop ring holding member 6, and a water stop ring holding member 6. An annular water stop material 9 is disposed over the inner periphery of the connecting portions of the segment rings 1 adjacent in the longitudinal direction of the tunnel. Since it is attached in a watertight manner to the inner circumference of the segment ring 1, the joints between the segment rings 1 can easily follow the displacement of the ground due to earthquake motion or uneven ground subsidence, and the joints between adjacent Even if the segment ring 1 is displaced in any direction, the annular water-stopping material always ensures water-stopping between the segment rings, and the water-stopping ring 5 protects the connection between the connector 3 and the through-hole 2 for insertion of the connector. It is possible to ensure water-tightness and reliably prevent the intrusion of groundwater, etc. into the tunnel, thereby allowing the tunnel to fully perform its functions against earthquakes and uneven ground subsidence.

In addition, since there is no need to use segments with a special structure and a segment with a simple structure can be used, it is general and economical, and the structure of the joint is simple, so it can be easily done without requiring any skill. It can be assembled and constructed, and the flexible waterproof joint of the present invention can be manufactured at a relatively low cost, so kon! Alternatively, the joints between each segment ring can be used as flexible waterproof joints over the length of the tunnel, taking into account the influence of uneven ground subsidence, etc., to ensure the safety of the tunnel. is obtained.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the present invention, in which FIG. 1 is a longitudinal sectional front view of a tunnel, FIG. 2 is a side view of a segment, and FIG. 3 is a longitudinal sectional side view of a segment. ,
FIG. 4 is a longitudinal side view showing the flexible waterproof joint of the segment ring, and FIG. 5 is a longitudinal front view showing the attachment part of the annular water stop material. 6 to 8 are longitudinal sectional side views showing examples of displacement of the flexible waterproof joint of the first embodiment. 9 to 11 are longitudinal sectional side views showing flexible waterproof joints according to second to fourth embodiments of the present invention. 12 to 15 show a fifth embodiment of the present invention, in which FIG. 12 is a vertical sectional front view of the tunnel, FIG. 13 is a vertical sectional side view of the segment, and FIG. 14 is a front view of the segment. , FIG. 15 is a vertical sectional side view showing the flexible waterproof joint of the segment ring. FIG. 16 is a longitudinal side view showing a flexible waterproof joint according to a sixth embodiment of the present invention, FIG. 17 is a longitudinal side view showing the relationship between another example of an annular water-stopping material and segments, and FIG. 18 19 and 20 are longitudinal side views showing another example of the annular water stop material attachment part, and FIGS. 19 and 20 are longitudinal side views showing a state in which a covering box is attached and secondary lining concrete is cast. In the figure, 1 is a segment ring, 2 is a through hole for connecting and inserting a device, and 3 is a segment ring.
1 is a connecting device, 4 is a gap, 5 is a water stop ring made of an elastic material, 6 is a water stop ring holding member, 7 is a pressing spring, 8 is a tightening member, 9
10 to 12 are segments, 15 is a frame material,
21 is a tightening washer, 22 is an annular water stop material mounting bolt, 23
25 is an insert, and 27 is a steel box.

Claims (1)

[Claims] 1 At the end of the tunnel longitudinal direction of the segment link 1, a coupling part that does not protrude to the outside of the segment ring but projects inside the segment ring is provided with a through hole 2 for insertion of a coupling device, and the segment rings that are adjacent to each other in the longitudinal direction of the tunnel The connecting parts of 1 are joined to each other, and the through holes 2 of each connecting part are connected to each other.
The connector 3 is inserted through the
and the through hole 2, and the connector 3 includes a water stop ring 5 made of an elastic material that is pressed against the inner surface of each connector and the outer peripheral surface of the connector 3, and a water stop ring 5. Pressing member 6
and a presser spring 7 that is engaged with the water stop ring presser member 6.
An annular water stop material 9 is fitted over the inner periphery of the connecting portion in the segment rings 1 adjacent in the longitudinal direction of the tunnel.
A segment ring flexible waterproof joint characterized in that the annular water stop material 9 is attached to the inner circumferential portion of each connecting portion in a watertight manner.