JP2000110184A - Rubber gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out water sealing securely by altering outer force applied to a rubber gasket, and permitting main body projections to be in contact with the compressed surface without interstices regardless of the size of unevennesses. SOLUTION: In a joint of the final caisson 2' in a V-block method, a rubber gasket 1 is laid substantially laterally on each mount surface 21 of the upper side or lower side of a caisson 2 as an underwater construction. Also, in conditions in which distal ends of projections 12, 12 come in contact with a surface to be compressed of the final caisson 2' being opposed with each other, when the rubber gasket 1 is subjected to a primary compression while the final caisson 2' moves in the direction substantially intersecting the longitudinal direction of the projection 12, the projections 12, 12 are fallen by lateral force through its movement, thereby prevent the occurrence of defects such as a failure of the primary water sealing. Thus, even when the unevennesses are large in the mount surface on which the rubber gasket is attached or in the compressed surface to which the rubber gasket is compressed, water sealing can be done securely by a sufficient following property.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber gasket used for watertight connection of an underwater structure such as a submerged box forming a submarine tunnel.

[0002]

2. Description of the Related Art As a method of constructing a tunnel on the bottom of the sea or a river, a plurality of buried boxes built on land are buried in a trench dug in the water bottom sequentially from both banks, and adjacent buried boxes are connected to each other. There is a so-called sinking method in which a tunnel is constructed by rigidly connecting the rubber gaskets sequentially while stopping the water.

Conventionally, as a rubber gasket used in the submerging method, a solid and long so-called solid type integrally formed of an elastic material such as vulcanized rubber having a shape as shown in FIG. Is common. The illustrated rubber gasket 9 has a main body 91 having a trapezoidal cross section.
A mounting portion (flange) 92 for mounting the rubber gasket 9 extending to the left and right from the base portion of the main body portion 91 to one of mounting surfaces of the adjacent housing boxes;
92, for the primary water stop, protruding along the longitudinal direction of the rubber gasket 9 from the top of the main body portion 91 pressed against the pressed surface of the other immersion box toward the pressed surface. And a nose 93. Reference numeral 92a in the figure is a through hole provided in the mounting portion 92 for inserting a bolt (not shown) for mounting the rubber gasket 9 on the mounting surface.

In the burying method using the rubber gasket 9 described above, first, a new burying box is sunk so as to be adjacent to an existing burying box fixed at a predetermined position, and this new burying box is jacked. Then, it is pulled in the direction of the existing submerged box, and is joined with the rubber gasket 9 interposed therebetween. Then, the ridges 93 of the rubber gasket 9 are primarily compressed, and the box connection portion is firstly stopped.

At this time, the rubber gasket 9 may be attached to an existing or newly installed submerged box. Next, as described above, the primary water is stopped by the rubber gasket 9 and the inside of the existing submerged box, and the inside of the newly installed submerged box,
When the water inside the box connection part separated by the partition wall provided on the end face of each buried box is drained out of the tunnel through the existing part of the tunnel, hydrostatic pressure is applied from the surroundings, and the new buried box is oriented in the direction of the existing buried box. Attracted further to
The main body 91 of the rubber gasket 9 is secondarily compressed, and the water stoppage is completed.

[0006] Therefore, when the two submerged tanks are rigidly connected to each other, the connection of one submerged box is completed, and a series of operations are repeated to connect the submerged boxes one by one to complete a submarine tunnel. The burying box used in the above burying method is generally constituted by packing concrete or the like in a predetermined space of a steel box.

[0007]

As described above, the submerged box is built in advance on a dock on land, but since it is quite large, the dock that can be built is not always located near the construction site. For this reason, usually, only a steel box is constructed with a dock on land so that it can be transported offshore to a distant route and a construction site, and concrete filling in the box is often performed on water near the construction site.

However, when the concrete is filled on the water near the construction site as described above, when the rubber gasket 9 is mounted on the mounting surface of the submerged box or the rubber gasket 9 of another submerged box is pressed against the concrete. The surface does not become a clean and flat surface parallel to the facing surface of the other submerged boxes as designed, that is, the so-called unevenness is likely to become large beyond the elastic deformation range of the conventional solid type rubber gasket 9 described above. There is a problem.

[0009] In the conventional rubber gasket 9, since it is not possible to sufficiently follow such a large unevenness, it is impossible to completely stop the water between the submerged boxes, and there is a possibility that the construction of the underwater tunnel becomes difficult. It is conceivable to increase the amount of rubber gasket that can be elastically deformed by softening the rubber that composes the solid type rubber gasket compared to the conventional one, or by increasing the height of the rubber gasket. Because the rubber gasket may be deformed not only in the height direction but also in the horizontal direction, which may lower the certainty of the water stoppage, it is not possible to make the rubber too soft or too high. I ca n’t,
The effect is naturally limited.

In addition, the capacity of the jack for drawing the new buried box in the direction of the existing buried box is increased so that the newly buried box is drawn closer, that is, the rubber gasket is made larger than before. It is conceivable to force it to follow the size of the land by compressing it. However, in this case, the larger the capacity of the jack is, the larger the size of the jack must be. However, there is a limit to the size of the jack that can be mounted in the submerged box, so that the effect is also limited.

An object of the present invention is to sufficiently follow the mounting surface of an underwater structure such as the above-mentioned submerged box on which a rubber gasket is mounted, or the surface to be pressed against which the rubber gasket is pressed, even if the unevenness is large. An object of the present invention is to provide a novel rubber gasket that can more reliably stop water.

[0012]

In order to solve the above-mentioned problems, a rubber gasket of the present invention is mounted on a mounting surface of one underwater structure so as to stop water between two adjacent underwater structures. In the state, the entire underwater structure which is pressed against the surface to be pressed of the other underwater structure facing the mounting surface and which is integrally formed of an elastic material, and A main body of a thick flat plate having a protruding ridge
i) a pair of thin plate-like legs extending along the longitudinal direction of the rubber gasket from the main body, and (iii) a pair of mountings on the mounting surfaces provided at the tips of both the legs. And a housing shape in which both legs are folded in accordance with a change in an applied external force in a state where the main body is extended in accordance with a change in external force applied to the underwater structure by being attached to the mounting surface of one of the underwater structures by the two attaching portions. The two legs are folded in advance so that they can take any shape between the two shapes of the protruding shape that protrudes from the mounting surface, and have a normal shape in which no external force is applied. It is characterized by being formed in an elliptical shape.

In the present invention, by changing the external force applied to the rubber gasket as described above, both legs are folded or stretched, that is, by bending and stretching.
The rubber gasket can be arbitrarily deformed in a wide range from the accommodation shape in which the mounting surface has few protrusions to the limit projection shape in which both legs can be extended, whereby the ridges of the main body portion can be formed. Can be brought into contact with the pressure-contact surface without any gap, regardless of the size of the unevenness.

Thus, according to the present invention, it is possible to follow a larger unevenness and perform more reliable water stoppage than a conventional solid type rubber gasket which stops water only by elastic deformation of rubber. Become. That is, with the legs extended as described above, and with the ridges of the main body contacting the pressure-contact surface without any gap, the rubber gasket attached to the mounting surface is separated from the outside by the main body and the two legs. In the space
For example, after injecting a curable filler such as mortar or curable resin, filling and curing, the underwater structures are pulled with a jack or the like as before, the ridges are primarily compressed, and the primary water is stopped. When the water in the box connection where the primary water was stopped is drained and the main body is secondarily compressed by hydrostatic pressure,
Irrespective of the size of the land, more reliable water stoppage can be performed.

In addition, since the rubber gasket of the present invention has both legs formed in a folded shape in advance so that the rubber gasket is housed in a normal state where no external force is applied, the rubber gasket is provided on one of the mounting surfaces of the underwater structure. In addition, there is no need to provide a guide member or the like for folding both legs in a fixed shape in order to accommodate the rubber gasket, and there is an advantage that the structure of the underwater structure can be simplified.

Further, the rubber gasket of the present invention is attached to the mounting surface by both mounting portions so that the groove extending along the longitudinal direction of the rubber gasket provided on the mounting surface of one underwater structure is straddled by both legs. In the normal state where no external force is applied, the legs are formed in a pre-folded shape so that the legs and the main body are housed in the grooves. Then, in such a housing shape, there is almost no protrusion on the mounting surface,
It is possible to perform more reliable water stoppage by following even larger irregularities.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A rubber gasket according to the present invention will be described below with reference to the drawings showing an example of the embodiment. First, the rubber gasket shown in FIGS. 1A and 1B will be described. As shown in these drawings, the rubber gasket of this example has a thick flat plate-shaped main body 11 and the main body 11.
In the figure, two parallel ridges 12 projecting upward from the upper surface along the longitudinal direction of the rubber gasket 1,
12 and a pair of thin plate-like members, which are also formed to extend in the longitudinal direction of the rubber gasket 1 from both end edges of the main body portion 11 and are folded in a U-shaped cross section in advance. The legs 13, 13 and both legs 13, 13
A pair of flat plate-like mounting portions (flanges) 14, 14 respectively extending outward from the tips of the main body 1 are formed integrally with an elastic material such as rubber, and the main body 1
1. Both leg portions 13, 13 and both mounting portions 14, 14 are reinforced by a base cloth 15 embedded therein.

That is, as shown in the figure, the rubber gasket 1 of this embodiment is formed in the above-described housing shape in which both legs are folded in a normal state where no external force is applied. Of the above, the main body 11 and the ridges 12 and 12 protruding upward from the main body 11 correspond to the entire conventional solid type rubber gasket.
The main body 11 is secondarily compressed after the first and second 2, 12 are compressed, and functions to completely stop water between the underwater structures.

The main body 11 and the ridges 12 and 12
In consideration of the water stoppage, the total amount of compressive deformation in the thickness direction at the time of the secondary compression is about 10 mm and the compression ratio (the total thickness T _{1 of the} main body 11 and the ridges 12, 12).
Is preferably a percentage of the amount of compressive deformation) is about 30-50% for, the thickness T ₁ For that purpose, about 2
Preferably, it is set to 0 mm or more. Thickness T ₁ is 20
If it is less than mm, the amount of compressive deformation at the time of secondary compression may be insufficient, and the water stoppage may decrease.

In consideration of more reliable water stoppage, the thickness T
₁ is preferably about 30 to 250 mm, more preferably about 40 to 80 mm, within the above range. Further, in this example, the two ridges 12 for the primary water stop are projected in parallel with each other along the longitudinal direction of the rubber gasket 1 for the following reason.

In other words, according to such a configuration, for example, the connection of the final immersion box 2 'in the V-block construction method to be described later (FIGS. 2 (a) to 2 (c)) allows the immersion box 2 as an underwater structure to be connected. The rubber gasket 1 is disposed substantially horizontally on the mounting surface 21 such as the upper side or the lower side, and the tips of the ridges 12, 12 of the rubber gasket 1 are in contact with the opposing contact surface 22 of the opposing final sinking box 2 '. When the rubber gasket 1 is primarily compressed while the final immersion box 2 ′ moves in a direction substantially perpendicular to the longitudinal direction of the ridge 12, the ridges 12, 12
However, there is an advantage that it is possible to more reliably prevent the occurrence of a failure that the primary water can not be stopped due to the lateral force due to the lateral movement due to the movement.

That is, the water confined in the gap between these members due to the contact of the two ridges 12, 12 with the pressure-contacting surface 22 of the opposing final immersion box 2 'causes, during the primary compression, While forming a very thin film of water between the tips of the ridges 12 and 12 and the surface 22 to be pressed, as a result of being gradually extruded from the gap, the film of water acts just as a lubricant, This prevents lateral protrusion of the ridges 12, 12 due to lateral force.

In the case of the rubber gasket 1 used for connection in which a lateral force is not applied as described above, only one ridge 12 may be provided. Both legs 13, 13
The rubber gasket 1 has the accommodation shape as described above,
(B) bent and stretched between a folded state shown in FIG. 1 (a) and a straightened state (not shown) so as to take an arbitrary shape between the two protruding shapes. In order to facilitate such bending and elongation, the whole is formed in a thin plate shape as described above.

Although the thickness is not particularly limited, it is about 5 to 30 m in consideration of compatibility between easiness of bending and stretching (flexibility) and maintenance of strength so as not to be easily damaged during bending and stretching.
m, and more preferably about 10 to 20 mm. Further, the height of the legs 13, 13 in a straightened state is not particularly limited, but is about 75 mm from the entire height of the rubber gasket 1 in this state, at a position where the legs 13, 13 are bent. The entire height of the rubber gasket 1 is set so that the main body 11 is pressed against the pressed surface 22 of the other immersion box 2 ', that is, the state shown in FIG. 2 (c). preferably, in order to set such a height, in consideration of the thickness T ₁ as described above, it is preferable to set the height of the legs 13, 13.

As shown in FIG. 1 (b) and FIGS. 2 (a) to 2 (c), the two mounting portions 14 and 14 attach the rubber gasket 1 to the mounting surface 21.
A plurality of through-holes 14a through which bolts B for fixing are fixed are formed at the front end of the rubber gasket 1 in the longitudinal direction. A ridge 14b is formed along the ridge.

Then, each mounting portion 14 is mounted on mounting surface 2
Screwing the bolt B inserted through the through hole 14a into the screw hole 21b provided on the mounting surface 21 and tightening the bolt B while being sandwiched between the mounting bracket 1 and the receiving bracket W for receiving the head of the bolt B. Thereby, both mounting portions 14 and 14 are fixed to the mounting surface 21 as shown in the drawing. When the legs 13 are extended in this fixed state, each of the mounting portions 1
In order to prevent the mounting portion 14 from coming out of the space between the mounting surface 21 and the receiving fitting W by the force indicated by the white arrow in FIG.
Engage with.

A wire 16 for reinforcement is embedded in the ridge 14b. Examples of the wire 16 include a metal wire such as a piano wire, a resin wire such as a nylon wire, and a rubber wire harder than the rubber constituting the rubber gasket 1. The main body 1
As the base cloth 15 that reinforces each of the legs 1, 13, and the mounting sections 14, 14, a nylon base cloth, for example, is preferably used. Although only one base cloth 15 is illustrated in the drawing, it is preferable that a plurality of base cloths are actually embedded.

For example, the main body 11 is provided with two legs 13, 13 in consideration of its compressive deformation and strength during secondary compression.
Each of the base fabrics 13 is buried with about three base fabrics 15 in consideration of its flexibility and strength. Also, both mounting portions 14, 14
The two mounting portions 14, 14 are, in particular, both leg portions 13,
When the body 13 is extended from the bent state, the body part 11 and the two legs are provided so as to increase the rigidity of the body 13 in order to prevent the body 13 from being deformed together and coming out of the space between the mounting surface 21 and the receiving bracket W. More than one or two base cloths 15 are embedded in the parts 13 and 13.

As an elastic material for integrally forming the main body 11, the ridges 12, 12, the legs 13, 13 and the mounting portions 14, 14, natural rubber or various conventionally known synthetic rubbers are used. Any of them can be used, and especially, the flexibility of the legs 13, 13 and the body 11,
Natural rubber is preferably used in consideration of the compression deformability of the ridges 12, 12 or the cost.

In consideration of the above-mentioned bending and stretching properties and compressive deformation properties, the hardness after hardening is JIS K6301.
The spring-type hardness Hs (JIS) determined by the spring-type hardness test (Type A) described in “Vulcanized Rubber Physical Test Method”
A hardness) of about 30-70 °, especially 40-6
Natural rubber with 0 ° is most preferably used. In order to set the hardness of the rubber in the above range, it is only necessary to adjust mainly the types and amounts of the reinforcing material and the filler as in the conventional case.

The rubber gasket 1 is placed at a predetermined position in a mold having a mold cavity corresponding to its cross-sectional shape, for example.
After arranging the unvulcanized rubber sheet, the base cloth 15 and the wire 16, the mold is heated under pressure to vulcanize the rubber. The rubber gasket 1 manufactured in this manner is mounted on the mounting surface 21 by fixing the mounting portions 14 and 14 to the mounting surface 21 of one of the submerged boxes 2 as described above.

The rubber gasket 1 of this embodiment formed in a housing shape as shown in FIGS. 1 (a) and 2 (a)
(b) In order to protrude from the mounting surface 21 as shown in (c), there are various methods for extending the two legs 13, 13 from the initial state, that is, from the folded state. The method of changing the internal pressure applied to the space S partitioned from the outside by the parts 13 and 13 is most preferably adopted.

According to this method, the state of contact between the ridges 12 and 12 against the pressure contact surface 22 is determined by changing the fluid (gas such as air or liquid such as water) injected into the space S to change the internal pressure. ) Can be kept almost constant over the entire surface based on the hydrostatic pressure of (1). Therefore, the long rubber gasket 1, whose extension amounts of the two legs 13, 13 may greatly vary depending on the unevenness of the mounting surface 21 and the press-contact surface 22, may be subjected to the press-contact of the ridges 12, 12. There is an advantage that the water stop can be more reliably prevented by preventing a portion where the contact with the surface 22 is not sufficient and the water stop is easily broken in a subsequent step.

The rubber gasket 1 of this embodiment having the above-mentioned components can be used for watertight connection of various underwater structures, but is particularly suitably used for connection of a final immersion box in the V block method. With the V block method, a plurality of buried boxes built on land are buried in trenches dug in the water bottom in order from both banks, and combined and finally left in the length direction of the buried tunnel, A wedge-shaped final sinking box (V-block) 2 'corresponding to the shape of this gap is inserted into a wedge-shaped gap having an upper end longer than the lower end, as shown in FIG. As shown in the figure, the rubber container is inserted from above, and the final
And the final connection while stopping the water between the existing submerged box 2 before and after it.

More specifically, with the rubber gasket 1 formed in the housing shape as described above attached to the mounting surface 21 of the immersion box 2, the immersion box 2 is sunk on the water bottom.
After bonding with the previous burying box (not shown), the final burying box 2 'is inserted from above into the wedge-shaped space left as shown by the black arrow in FIG. 5 and FIG. 2 (a). After insertion, the two submerged boxes 2, 2 'are brought close to a predetermined distance (FIG. 2 (a)). This has the advantage that the rubber gasket 1 does not hinder the insertion of the final immersion box 2 ', and that the rubber gasket 1 can be more reliably prevented from being damaged.

Next, when a predetermined interval is set between the two submerged boxes 2 and 2 ', the insertion of the final submerged box 2' is temporarily stopped, and then the fluid is injected into the space S to reduce the internal pressure. By raising, the two legs 13, 13 of the rubber gasket 1 are extended, and as shown in FIG.
12 is brought into contact with the pressure contact surface 22 without any gap. Next, at this stage, a curable filler M such as mortar or curable resin is injected and filled into the space S. On this occasion,
The fluid previously injected into the space S is discharged from the space S while maintaining the internal pressure of the space S by, for example, the action of a differential pressure valve.

Next, when the filling material M is fully cured and hardened, when the final immersion box 2 'is further inserted, the ridges 12, 12 are primarily compressed, as shown in FIG. 2 (c). Primary water is stopped between the submerged boxes 2 and 2 '. In addition, as the curable filler M such as the mortar and the curable resin, it is preferable to use a material that is hardened within several hours and develops strength, if possible.

Next, as described above, the primary gas is stopped by the rubber gasket 1 and the partition walls provided in the existing submerged boxes 2 and the final submerged boxes 2 'and the end faces of the respective submerged boxes 2, 2'. When the water in the box connection part partitioned by the above is drained out of the tunnel through the existing part of the tunnel, hydrostatic pressure is applied from the surroundings, and the final immersion box 2 'is pushed further downward, and the main body 11 of the rubber gasket becomes secondary. When compressed, the box connection is completely shut off.

When the water in the box connecting portion is drained, the final immersion box 2 'is pushed down by the hydrostatic pressure because the upper end of the final immersion box 2' is set longer than the lower end, and it is added to the upper surface thereof. This is because the downward hydrostatic pressure is greater than the upward hydrostatic pressure applied to the lower surface. Thereafter, when the front and rear sunk boxes 2 and the final sunk box 2 'are rigidly connected, the final connection of the sunk tunnel is completed.

According to the connection method of this example as described above,
In the so-called V block construction method,
It becomes possible to connect the final buried box 2 ′ while stopping the water more reliably regardless of the size of the land. Next, the rubber gasket 1 of the example of FIGS. 3A and 3B will be described. The difference between this example and the previous example is that the rubber gasket 1
However, as shown in FIGS. 4 (a) to 4 (c), the two legs 13, 13 straddle the groove 21a provided on the mounting surface 21 of the one underwater structure 2 along the longitudinal direction of the rubber gasket 1. And then
As shown in FIG. 4 (a), as shown in FIG. 4 (a), in a state where it is mounted on the mounting surface 21 by the two mounting portions 14 and 14, in this mounted state and in a normal state where no external force is applied.
The two legs 13, 13 and the main body 11 are housed in the groove 21a.
Is formed beforehand in a shape folded in a substantially U-shaped cross section.

When the rubber gasket 1 of this example is used, in the housing shape, as shown in FIG. 4 (a), there is almost no protrusion on the mounting surface 21, so that it is even larger than in the previous case. There is an advantage that it is possible to perform more reliable water stoppage by following uneven ground. More specifically, the rubber gasket 1 of the above example has a thick flat plate-shaped main body 1.
1, two projecting ridges 12 and 12 projecting upward along the longitudinal direction of the rubber gasket 1 from the upper surface in the figure of the main body 11, and both end edges of the main body 11 , A pair of thin plate-like legs 1 extending downward in the reverse direction along the longitudinal direction of the rubber gasket 1 and previously formed in a state of being folded into a substantially U-shaped cross section as described above.
3, 13 and a pair of flat mounting portions (flanges) 1 extending outward from the ends of the legs 13, 13, respectively.
4 and 14 are integrally formed of an elastic material such as rubber in the same manner as described above, and the main body 11, both legs 13 and 13, and both mounting portions 14 and 14 of the above-described respective portions are embedded in the inside thereof. It is reinforced by a cloth 15.

The main body 11 and the main body 11
The ridges 12 and 12 projecting upward from the main body 1 are, as described above, equivalent to the entire conventional solid type rubber gasket.
1 is secondarily compressed and functions to completely stop water between the underwater structures. The main body 11 and the ridges 12, 12
In view of the water stopping performance, the thickness T ₁ of the total of both is preferably within the same range as above.

Each of the legs 13, 13 is formed in a state of being folded into a substantially U-shaped cross section in order to make the rubber gasket 1 into the above-mentioned accommodation shape. The thickness of the legs 13, 13 is preferably in the same range as described above in consideration of compatibility between the bending and extensibility and the strength. In addition, both legs 1
3 and 13, total height when used as a protruded state of the rubber gasket 1 is also to be within the same range as above, in consideration of the thickness T ₁ as described above, extended to the limit It is preferable to set the height in the state.

In the same manner as described above, bolts B for tightening and fixing the mounting portions 14 between the mounting surface 21 and the receiving bracket W are inserted through the mounting portions 14 and 14 respectively. A large number of through holes 14a are formed. Similarly, the distal end portion of the rubber member which functions as a stopper for the mounting portion 14 against the force indicated by a white arrow in FIG. A ridge 14b is formed along the longitudinal direction of the gasket 1, and a wire 16 for reinforcement is buried inside the ridge 14b in the same manner as described above.

As the wire 16 or the base cloth 15,
The same material as described above is used. Also, for the same reason as described above, the base cloth 15 has about three sheets on the main body 11 and the two legs 13,
Is buried about one or two more than that. The elastic material which integrally forms the main body 11, the ridges 12, 12, the legs 13, 13, and the mounting portions 14, 14 has a JIS A hardness of about 30 to 70 °, especially 40, as described above.
Natural rubber of about 60 ° is preferably used.

Similarly to the above, the rubber gasket 1 is provided with an unvulcanized rubber sheet and a base cloth 15 at a predetermined position in a mold having a mold cavity corresponding to the sectional shape thereof, for example.
After arranging the wire and the wire 16, the mold is heated under pressure to vulcanize the rubber, thereby producing the rubber. The rubber gasket 1 manufactured in this manner includes the mounting portions 14, 14.
Is fixed to both sides of the groove 21a, so that the groove 21a is attached to the attachment surface 21 in a state of straddling the two legs 13, 13.

As shown in FIGS. 3 (a) and 4 (a), the rubber gasket 1 of this embodiment formed in a shape to be accommodated in the groove 21a.
As shown in FIGS. 3 (b) and 3 (c), the two legs 13, 13 are extended from the initial state, that is, from the bent state, so as to protrude from the mounting surface 21 as shown in FIGS. A method of changing the internal pressure applied to the space S separated from the outside by the two legs 13, 13 is most preferably adopted. The reason is as described above.

The rubber gasket 1 of this example having the above-described components is also suitably used for connecting the final sunk box in the V-block method described above. That is, first, in a state where the rubber gasket 1 formed in the shape of being housed in the groove 21a as described above is mounted on the mounting surface 21 of the immersion box 2,
After submerging the submerged box 2 in the water bottom and joining it with the previous submerged box (not shown), the wedge-shaped void portion left at the end is indicated by a black arrow in FIG. 5 and FIG. Insert the final immersion box 2 'from above as shown,
It is brought close to a predetermined distance set in advance [FIG.
(a)].

Next, when the distance between the two submerged boxes 2 and 2 'has reached a predetermined interval, the insertion of the final submerged box 2' is temporarily stopped, and then the fluid is injected into the space S through the injection pipe 23. By increasing the internal pressure, the two legs 13, 13 of the rubber gasket 1 are extended, and as shown in FIG. Make contact.

Next, at this stage, a curable filler M such as mortar or curable resin is injected into the space S.
To fill. At this time, the fluid previously injected into the space S is injected into the filling material M through the discharge pipe 24 which can expand and contract according to the expansion and contraction of the rubber gasket 1 as shown in FIGS. At the same time, the air is discharged from the space S while maintaining the internal pressure of the space S.

If the discharge pipe 24 is made expandable and contractable in accordance with the expansion and contraction of the rubber gasket 1 as described above, the fluid in the space S is more reliably discharged, and the filling material M is inserted into the space S by a gap. There is an advantage that it can be filled without any problem. Next, at the stage where the above-mentioned filler M has sufficiently cured and hardened,
When the final immersion box 2 'is further inserted, the ridges 12, 12 are primarily compressed, and as shown in FIG.
The space is temporarily shut off.

Thereafter, as in the previous example, the primary water is stopped by the rubber gasket 1 and the inside of the existing immersion box 2 and the final immersion box 2 ′ and the respective immersion boxes 2, 2 ′
When the water in the box connection part partitioned by the partition provided on the end face of the above is drained out of the tunnel through the existing part of the tunnel, hydrostatic pressure is applied from the surroundings, and the final buried box 2 'is further pushed down, and the rubber gasket The main body 11 is secondarily compressed, and the box connection is completely stopped.

When the front and rear immersion boxes 2 and the final immersion box 2 'are rigidly connected, the final connection of the immersion tunnel is completed.
As described above, also in the connection method of this example, in the V-block method, the existing buried box 2 and the final buried box 2 'are connected while more reliably stopping water regardless of the size of the land. It becomes possible.

The configuration of the present invention is not limited to the examples shown in the drawings described above. For example, in the rubber gasket of FIGS. 1 and 3, two ridges 12 are provided on the main body portion 11, but the number of such ridges may be one as described above, or three or more. , May be provided. In addition, the rubber gasket of the example of the above both figures is
Although the ridge 14b reinforced by the wire 16 is provided, the ridge may not be provided.

Further, the rubber gasket of the present invention can be used not only for connecting the final sunk box in the V-block method described above, but also for connecting the sunk boxes before and after the V block method.
It can also be used for connection of submerged boxes other than the block method, or for watertight connection of various underwater structures such as the underwater portion of a floating structure. In addition, various design changes can be made without changing the gist of the present invention.

[0056]

As described in detail above, according to the present invention,
Even if the surface of the underwater structure, such as a submerged box, on which the rubber gasket is attached, or the surface to which the rubber gasket is pressed, has a large unevenness, the water can be stopped more reliably even if the unevenness is large. Thus, a unique rubber gasket can be provided.

[Brief description of the drawings]

FIG. 1 is a view showing an example of an embodiment of a rubber gasket of the present invention, wherein FIG. 1 (a) is a partially cut perspective view showing the whole, and FIG. It is an expanded sectional view showing a structure.

FIGS. 2 (a) to 2 (c) are partial enlarged cross-sectional views each showing a step of performing final connection of a submerged tunnel by a V-block method using the rubber gasket of the above example.

FIG. 3 is a view showing another example of the embodiment of the rubber gasket of the present invention, wherein FIG. 3 (a) is a partially cut perspective view showing the entirety, and FIG. It is an expanded sectional view which shows the fixing structure.

FIGS. 4 (a) to 4 (c) are partial enlarged cross-sectional views each showing a step of performing a final connection of a submerged tunnel by a V-block method using the rubber gasket of the above example.

FIG. 5 is a schematic diagram illustrating a final connection step of a buried tunnel in the V-block method.

FIG. 6 is a partially cut perspective view showing an example of a solid type rubber gasket used in a conventional connection method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rubber gasket 11 Main part 12 Protrusion 13 Leg 14 Mounting part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Shimoishi 2-2-8 Koraku Bunkyo-ku, Tokyo Within Goyo Construction Co., Ltd. (72) Inventor Shinji Hayashi 2-11 Kita-Goba, Kita-ku, Kobe-shi, Hyogo Prefecture -1-1309 (72) Inventor Akira Kanjiro 1-13-9-1005, Mikuni Honcho, Yodogawa-ku, Osaka-shi, Osaka F-term (reference) 2D055 EA00 GC09 KB09 3J040 AA01 AA12 BA07 CA02 EA01 EA16 EA21 FA05 HA15

Claims (2)

[Claims] In order to stop water between two adjacent underwater structures, the first underwater structure is attached to a mounting surface of one of the underwater structures, and is pressed against a surface to be pressed of another underwater structure facing the mounting surface. A long rubber gasket to be pressed and integrally formed of an elastic material as a whole, and (i) a thick flat plate-shaped main body having a ridge protruding toward the surface to be pressed; (ii) a pair of thin plate-like legs extending along the longitudinal direction of the rubber gasket from the main body, and (iii) a pair of thin legs provided at the tips of the two legs, respectively, to the mounting surface. A mounting shape in which both legs are folded in accordance with a change in external force to be applied in a state where the two legs are mounted on the mounting surface of one of the underwater structures, and a body in which both legs are extended. It can take any shape between the two shapes of the protruding shape where the part protrudes from the mounting surface. A rubber gasket characterized in that both legs are formed in a pre-folded shape so as to be formed in such a manner as to be accommodated in a normal state where no external force is applied. 2. An underwater structure provided on a mounting surface of one of the underwater structures.
Both legs and the main body are housed in the above-mentioned groove in a normal state where external force is not applied when the rubber gasket is installed on the mounting surface by both mounting parts so as to straddle the groove along the longitudinal direction of the rubber gasket. 2. The rubber gasket according to claim 1, wherein the two leg portions are formed in a pre-folded shape so as to have a accommodated shape.