JPH06272496A - Seal - Google Patents

Abstract

PURPOSE:To prevent the water leak of a joint part by a seal following the repeated deformation of a segment ring under construction and also capable of closing a large aperture. CONSTITUTION:A water expansion body storage area 6s is provided in an elastic body 6, and a water expansion body 9 such as water expansion rubber is disposed in the water expansion body storage area 6s to form a seal 5. This seal 5 is disposed in the clamped state at a joint part 32 which is a member clearance between adjacent segments 31, 31. In the normal state, the elastic body 6 follows the expansion of the joint part 32 in the form of being elastically deformed, and if the elastic body 6 is ruptured, the water expansion body 9 is expanded in contact with water through a cavity (SP) formed by rupture so as to stop water again in the joint part 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal suitable for sealing a segment joint surface in a shield tunnel.

[0002]

2. Description of the Related Art Conventionally, in a shield tunnel, in order to prevent water leakage between adjacent segments, a seal member made of a band-shaped elastic body is provided with an appropriate groove on a segment joint surface. It is well known that a water leakage preventive work is arranged here by being bonded to the groove. At this time, since the segment ring is repeatedly deformed during the construction due to the change of earth pressure due to excavation with time, the joint surface gap of the segment expands and contracts. Is
If elastic deformation is not possible following such expansion and contraction, sufficient water leakage cannot be prevented.

[0003]

However, since such a seal member is a standard product which is preliminarily processed into a band shape in a factory or the like from the viewpoint of the ease of construction, the seal member has an elastic deformation range. Only the expansion and contraction of the segment joint surface gap can be followed. Therefore, due to the large deformation of the segment ring that exceeds the elastic deformation region,
When a large opening is formed on the joint surface, there is a risk that the seal member will break and water will leak through the broken part. Therefore, by using a water-expandable rubber made of urethane rubber or the like that expands when it comes into contact with water as a seal member, it is expanded by contact with water that is to enter between adjacent segments,
There is also a method of closing the openings formed on the segment joint surface. However, when such a water-expanded rubber is submerged when the segment ring is severely deformed during tunnel construction, it is water-expanded in that state and its shape is substantially fixed in the expanded state. The water-expanded rubber in the expanded state has a drawback that when the earth pressure changes after the construction is completed and the segment ring is deformed again, it is difficult to follow the expansion and contraction of the segment joint surface gap caused thereby. Therefore, in view of the above circumstances, the present invention can always effectively follow the expansion and contraction of the member gap to be sealed such as the segment joint surface gap, and
The present invention provides a seal capable of sufficiently sealing even if a large opening is formed in the member gap.

[0004]

That is, according to the present invention, an elastic body (6) having a shape corresponding to a member gap (32) to be water-stopped,
(6 '), water expansion body storage areas (6s) and (6p) are formed inside the elastic bodies (6) and (6'), and the water expansion body storage areas (6s) and (6p) are formed. ) Is provided with water expanders (9) and (10) that are expandable by contact with water,
Composed. The numbers in parentheses () indicate the corresponding elements in the drawings for convenience, and therefore the present description is not limited to the description in the drawings. The same applies to the following action columns.

[0005]

With the above-described structure, the present invention follows the expansion and contraction of the width W2 of the member gap (32) to be stopped by elastic deformation of the elastic bodies (6) and (6 ') in a normal state. On the other hand, the elastic bodies (6) and (6 ') seal the member gaps (32) which should stop the water, and the elastic bodies (6) and (6') by any chance.
When the elastic body (6), (6 ′) is broken, the void (SP) formed by breaking the elastic body (6), (6 ′)
The water expansive body (9), (10) acts so as to seal the member gap (32) to be stopped in the form that the water expansive body (9), (10) expands by contact with water and closes it.

[0006]

1 is a cutaway perspective view showing an example of a tunnel formed by a segment lining body using a seal according to the present invention, FIG.
4 is a sectional view showing a segment joint portion in the segment lining body shown in FIG. 1, FIG. 3 is a sectional view showing an embodiment of a seal according to the present invention sandwiched between the segment joint portions shown in FIG. 2, FIG. 2 is a diagram showing a case where a mesh opening occurs in the segment joint portion shown in FIG. 2, FIG. 5 is a diagram showing another embodiment of the seal according to the present invention, and FIG. 6 is a diagram showing attachment of the seal shown in FIG. 5 to the segment joint portion. It is sectional drawing which shows a mode.

The tunnel 1 has a ground 2 as shown in FIG.
The lining 3 has a lining 3 formed in a rollover cylindrical shape so as to extend in the directions of arrows A and B which are the digging direction.
Is formed along the outer periphery of the excavation tunnel 2s, that is, the ground 2 is formed in the excavation tunnel 2s formed in the ground 2 in the shape of an overturning cylinder by a shield device (not shown) that is the excavation means of the tunnel 1. It is formed and constructed in the shape of an overturning cylinder connected to the existing pit wall. An appropriate backing material is injected between the lining 3 and the ground 2 in a substantially annular shape so as to connect and fix the lining 3 to the ground 2, and the inside of the lining 3 is filled. The tunnel space 3s is formed in a laterally inverted column shape corresponding to the shape of the inner peripheral surface 3a of the lining 3. The lining 3 is
As shown in FIG. 1, the ring width of one ring is a width L1 and is composed of a plurality of segment rings 30 that are sequentially connected in the direction of arrow A, B in FIG. The segment ring 30 includes segments 31 made of precast concrete, each of which is formed in the shape of a block that draws an arc along the lining shape of the tunnel 1, and is arranged along the directions C and D of the tunnel circumferential direction. It is composed of a plurality of connected parts that form an annular shape.

As shown in FIG. 1, each segment 31 has a bolt box 33 at its inner 4 side portion, that is, at the end portion on the side of the tunnel space 3s in the direction of arrows A and B and the direction of arrow C and D. However, in FIG. 1, a total of eight locations are provided, two locations on each side, and arrows A and B are provided.
Segments 31 and 3 that are adjacent in the direction and in the directions C and D
The respective bolt boxes 33 provided in No. 1 are arranged at alignment positions so as to face each other. As shown in FIG. 2, each bolt box 33 is formed in a box-out shape so as to be recessed from the inner peripheral surface 3 a of the lining 3 toward the inside of the member of the segment 31.
3, bolts 35 for fastening and connecting the segments 31, 31 adjacent to each other in the arrow A, B directions or the arrow C, D directions are inserted into the bolt holes 33s formed in the respective bolt boxes 33. Each of them is fitted and fastened with a predetermined torque via the nut 36, and is mounted and arranged.

By the way, in the lining 3, as shown in FIG. 1, the joint portions 32 are provided with segment rings 30, 30 adjacent to each other in the directions of arrows A and B, and segments 31 adjacent to each other in the directions of arrows C and D. A segment seal 5 that can prevent water leakage from the joint portions 32 is formed in each joint portion 32 as a member gap between the segments 31 and 31 so as to stop the water. Is the bolt 3 for fastening and connecting the segments 31, 31 to each other.
5 and the nuts 36 are interposed between the segments 31, 31 respectively. As shown in FIG. 2, the segment seal 5 is formed in a strip shape along the shape of the joint portion 32 which is a member gap to be stopped.
It has an elastic body 6 made of an elastic vinyl chloride material having a waterproof property, and a mountain fold portion 6b is provided at the upper end portion of the elastic body 6 in FIG.
The elastic body 6 is formed here so that its cross-sectional shape is a gate shape, that is, a U-shape. The elastic body 6 forms the outer peripheral portion of the segment seal 5 and is the side surface of the segment seal 5. The side surfaces 6a, 6a shown on the left and right sides of FIG. 2 of the elastic body 6 are the adhesive 7 shown in FIG. Through
It is directly adhered to each joint surface 31a, 31a of the segments 31, 31 adjacent in the arrow A, B direction or the arrow C, D direction. The elastic member 6 has a width W2 shown in the left-right direction in FIG.
When the lining 3 is deformed so that the size of the elastic body 6 is increased or decreased, that is, the elastic body 6 is elastically deformable following the deformation of the lining 3, and the elastic body 6 is larger than the elastic deformation area of the elastic body 6. For the deformation of the work 3, the adhesive 7 part is the joint surface 3
Along the assumed fracture line SL indicated by the one-dot chain line in FIG. 2 in a shape along the extension direction of the joint portion 32 without peeling from 1a,
The elastic body 6 itself is configured to be broken.

Inside the elastic body 6, as shown in FIG.
Below the mountain fold portion 6b, a water expansion body mounting region 6s as a region for accommodating a water expansion body 9 which will be described later is provided, and in the embodiment, inside the elastic body 6 along the assumed fracture line SL, the lower side in FIG. The water-expansion body mounting area 6s has a mountain fold portion 6b formed at its upper end, and both side surfaces 6a, 6a are adjacent to each other.
The elastic body 6 itself, which is connected to the joint surfaces 31a and 31a of the first and third parts 31, is cut off from the ground 2. In the water expansion body mounting region 6s, a water expansion body 9 made of water expansion rubber such as urethane rubber that is expandable by contact with water is provided in a band shape so as to fill the entire water expansion body mounting region 6s. The water expansion body 9 is in direct contact with the ground 2 in a normal arrangement state because the water expansion body mounting region 6s in which the water expansion body 9 is arranged is cut off from the ground 2 through the elastic body 6 itself. It is in a shape that cannot be obtained.

At the upper end of the water expander 9 shown in FIG.
Is formed here in a form in which the water expansion body 9 is formed in two folded shapes, and the mountain fold portion 9b of the water expansion body 9 is formed.
Is arranged on the side of the tunnel space 3s shown in the lower side of FIG. 2 of the mountain bending portion 6b of the elastic body 6. The water expansion body 9 and the elastic body 6 are connected to each other in the left-right direction in FIG. 2 through the tightening force of the bolt 35 and the nut 36 for fastening and connecting the adjacent segments 31 and 31 to each other. By being pressed and tightened, the inner surfaces 9c, 9c of the water expansion body 9 are connected to each other, and the side surfaces 9a, 9a are connected to the elastic body 6 side. As shown in FIG. 2, the segment seal 5 has a width when it is in a tightened state at the joint portion 32 which is a member gap to be water-stopped having a width W2 before being arranged in the joint portion 32. As shown in FIG. 3, the width W1 in the stress released state is contracted in the left-right direction in FIG. The water expander 9 is
The side surfaces 9a, 9a are preliminarily formed by the elastic body 6 by factory processing or the like.
It is in the form of being fused and bonded to.

Since the tunnel 1 has the above-mentioned structure, in order to construct the tunnel 1, a shield device is used, and at the initial stage of constructing the tunnel 1, an appropriate temporary installation is made in a shaft or the like which is a shield starting point. Reaction force The ground 2 is dug through the ground excavation means of the shield device in the form of finding a reaction force on the pedestal or the like and then a propulsion reaction force at the front end of the lining 3, which is then applied to the ground 2 I will promote it inside. Then, each time the shield device is propelled by an amount corresponding to the width L1 of the segment ring 30, the segment 31 is connected annularly along the directions C, D, which are the circumferential direction of the tunnel, to thereby form the segment L1. The lining 3 is constructed by forming the ring 30 and sequentially connecting the segment rings 30 in the directions of the arrows A and B, which are the axial direction of the tunnel, and connecting and fixing the ring 30 to the ground 2 through the backing material. I will do it. That is, the lining 3 is constructed by building a plurality of the segments 31 in the tunnel circumferential direction and the tunnel axial direction in the excavated tunnel 2s formed by the shield device.
The segment ring 30 having the width L1 is constructed in such a manner that the lining 3 supports the earth pressure by the ground 2 around the lining 3.

By the way, when constructing the lining 3 by incorporating a plurality of segments 31 so as to be connected along the tunnel circumferential direction and the tunnel axial direction, when the segments 31, 31 adjacent to each other in the directions of arrows C and D are constructed. Between the segment rings 30 adjacent to each other and in the directions of the arrows A and B, the segment seals 5 are respectively arranged in the joint portions 32 formed in a band shape as member gaps of the segments 31 and 31. Therefore, when each segment 31 is built, as shown in FIG.
As shown in FIG. 3, by using the segment seal 5 in which the elastic body 6 is formed along the shape of each joint portion 32, for example, the adhesive 7 is attached to the left and right side surfaces 6a, 6a of the elastic body 6 in FIG. The side surface 6 to which the adhesive 7 has been applied after each application
a and 6a are bonded to the joint surfaces 31a and 31a, the segment seal 5 is attached to the adjacent segments 31 and 31a.
It is sandwiched between them. In this state, as shown in FIG. 2, from one bolt box 33 side provided in the adjacent segments 31, 31, a bolt 35 is inserted into the bolt hole 33s and the bolt 35 is inserted into the other bolt box 33. By fastening with the nut 36 from the side, the adjacent segments 31, 31 are connected in a form in which the segment seal 5 is sandwiched and arranged between the segments 31, 31. The bolts 35 and the nuts 36 are loosened in such a manner that the bolts 35 and the nuts 36 receive an appropriate repulsive force by the elastic forces of the elastic body 6 and the water expansion body 9 that form the segment seal 5 that is sandwiched and arranged in the joint portion 32. The adjacent segments 31, 31 can be preferably fastened and connected in a state where the above-mentioned phenomenon is prevented.

In this way, when the segment seal 5 is sandwiched between the adjacent segments 31 and 31 in the arrow A and B directions and the arrow C and D directions when the respective segments 31 are installed, the The joint portions 32 of the plurality of segments 31 constituting the work 3 have the respective joint portions 3
The segment seals 5 are arranged in a strip shape along the line 2. Then, in the segment seal 5 arranged in the joint portion 32, the side surfaces 6 a, 6 a of the elastic body 6 forming the outer peripheral portion of the segment seal 5 are joined to each other by the joints of the segments 31, 31 via the adhesive 7. It becomes a form integrally connected to the surfaces 31a, 31a. At this time, the adhesive 7 is applied on the segment ring 30 formed in the ring shape by the arrow C,
A ring fastening force is generated between the segments 31 adjacent to each other in the D direction along the tunnel circumferential direction, or the shield propelling jack causes the segment ring 30 to adjoin the other segment ring 30 on the rear side thereof. In addition to pressing the segments 31 and 31 adjacent to each other in the directions of the arrows A and B toward each other by pressing the segments toward each other, the bolts 35 and the nuts 36 for fastening and connecting the adjacent segments 31 and 31 together. Through the tightening force of the side surfaces 6a, 6a of the elastic body 6 and the joint surface 31 of the segment 31.
It is possible to firmly bond and integrate a and 31a. Thus, the elastic body 6 of the segment seal 5 whose side surfaces 6a, 6a are adhesively connected to the joint surfaces 31a, 31a by the adhesive 7 has a shape that isolates the tunnel space 3s from the ground 2, as shown in FIG. Thus, the pore water in the ground 2 is prevented from leaking into the tunnel space 3s.

By the way, during construction of the tunnel 1, the ground 2 which has been in an unstable ground stress state due to the formation of the excavation tunnel 2s is not yet stabilized, so that the lining 3
Often, the segment ring 30 that constitutes the member is deformed, whereby the width W2 of each joint portion 32, which is a member gap between the segments 31 adjacent to each other in the arrow A and B directions and the arrow C and D directions. (Shown in Figure 2)
Each of the segment rings 30 expands and contracts in a form corresponding to the local deformation amount. At this time, the segment seal 5
Is a joint portion 32 in which the elastic members 6 and 9 are elastically deformed due to the elastic properties of the elastic member 6 and the water expander 9.
While following the expansion and contraction of the tunnel space 3s, the tunnel space 3s can always be suitably sealed against the ground 2. In particular, the elastic body 6 is formed such that a mountain fold portion 6b is formed on the ground 2 side shown in the upper end portion of FIG. 2, and the elastic body 6 is formed so that the cross-sectional shape of the elastic body 6 is a gate shape. When the width W2 of the joint portion 32 contracts due to the adhesive connection of the joint 6a to the joint surfaces 31a and 31a of the adjacent segments 31 and 31, the water expander mounting region which is the inner region from the side faces 6a and 6a. The predetermined sealing performance is continuously maintained while being pressed in the left-right direction in FIG. 2 toward the 6s side. And joint part 3
When the width W2 of 2 is expanded, that is, when the openings 31 are formed between the adjacent segments 31, 31, the elastic body 6 has side surfaces 6a, 6a that are adhesively connected to the joint surfaces 31a, 31a, respectively. The water-expansion body mounting region 6s is naturally expanded by being pulled by the joint surfaces 31a, 31a. In this way, the elastic body 6 in which the water expansion body mounting region 6s is expanded has the side surfaces 6a, 6a adhesively connected to the joint surfaces 31a, 31a of the adjacent segments 31, 31, so that the tunnel space has been 3s can be isolated from the ground 2. That is,
The segment seal 5 has a structure in which the elastic body 6 forming the outer peripheral portion of the segment seal 6 is smoothly elastically deformed by utilizing its elastic property and its shape, so that the expansion and contraction of the joint portion 32 is always followed. Therefore, it is possible to preferably prevent water leakage through the joint portion 32.

During the construction of the tunnel 1 or after the construction is completed, the elastic body 6 of the segment seal 5 is elastically deformed in the joint portion 32 which is a member gap formed between the adjacent segments 31, 31 as described above. Then, if a large opening is formed that is more than able to follow this,
The elastic body 6 of the segment seal 5 has its side surface 6
a and 6a are not separated from the joint surfaces 31a and 31a, and are along the extensional direction of the joint portion 32 along the fracture assumed line SL, as shown in FIG. Break. As a result, in the elastic body 6, as shown in FIG. 4, the fractured portion 6c along the assumed fracture line SL is a region formed inside the elastic body 6, which is the water expansion body mounting region 6
s and the ground 2 are formed to communicate with each other. At this time, the water expansion body mounting region 6s of the elastic body 6 is expanded in its region range in a shape corresponding to the opening of the joint portion 32. That is, a new void (SP) is formed in the joint portion 32, which is a member gap to be stopped, by the breakage of the elastic body 6 so as to be surrounded by an alternate long and short dash line. Then, in the segment seal 5 arranged in the joint portion 32, in the water expansion body mounting region 6s, the water expansion body 9 expandable by contact with water is formed, and before the break portion 6c is formed, the ground 2 Since it is provided so as not to come into direct contact with the water expansion body mounting region 6s and is provided so as to fill the entire water expansion body mounting region 6s, a new gap for stopping water is formed due to the formation of the fractured portion 6c. (SP) is formed, and the water expansion body mounting region 6s and the ground 2 communicate with each other through the void (SP). As a result, the water expander 9 is in contact with the pore water in the ground 2 and is expanded by the area of the water expander mounting area 6s as described above, that is, by the amount corresponding to the new void (SP). As shown by the shaded area in FIG. 4, water expands. Thus, the water expander 9 in the expanded state as shown in FIG.
Re-separates the tunnel space 3s from the ground 2 again by closing the void (SP) formed in the joint portion 32 due to the expansion of the water expansion body mounting region 6s due to the breakage of the elastic body 6. As a result, the segment seals 5 are made adjacent to each other by the volume of the elastic body 6 and the water expansive body 9.
The joint part 32 between the first and the third parts is prevented from leaking water again.

By the way, in the segment seal provided in the joint portion 32, as shown in FIG. 5, the water expander mounting area 6p, which is an area for accommodating the water expander, is provided with the elastic body 6 '.
There is also a segment seal 5'provided inside the elastic body 6 so as to be surrounded by, and each of the segment seals 5'shown in FIG. 5, the water expanders 10 made of the same material as the water expander 9 are arranged in two rows on the left and right in FIG. As a result, the segment seal 5 ′ shown in FIG. 5 is elastically deformed by the elastic body 6 to follow the expansion and contraction of the width W2 of the joint portion 32, which is a member gap to be stopped. When the elastic body 6 ′ ruptures itself by itself sealing the joint portion 32, that is, when a large opening is formed in the joint portion 32, the water expander 10 ′ expands due to contact with water, The water expansion body 10 ′ can seal the joint portion 32 in this way by closing the broken portion of the elastic body 6 ′. At this time, the water expansion body mounting area 6p
Is formed so as to be surrounded by the elastic body 6 ', so that the water expansion body 10 disposed in the water expansion body mounting region 6p can be used until the elastic body 6'breaks. 6 '
Therefore, the joint portion 32 can be sealed in such a manner that only the elastic property is developed in the form of being always protected and the water expander 10 is expanded by water only after the elastic body 6 ′ is broken. Therefore,
Highly effective for preventing water leakage in case of emergency. Such arrangement of the segment seals 5 and 5'in the lining 3 is arbitrary, and the segment seals 5 and 5'may be provided in a form corresponding to the water stoppage required for the joint portion 32 of the lining 3, workability, ground properties, or the like. Various techniques are used.

For example, the segment seal 5'shown in FIG.
When arranging this in the joint portion 32 between the adjacent segments 31, 31 as shown in FIG. 6, each segment 31 has a portion corresponding to the joint surface 31a of the segment 31. , The groove-shaped seal mounting portion 31s, the seal mounting portions 31s of the adjacent segments 31, 31,
31s may be provided so as to face each other so as to form a substantially predetermined width W3, and the segment seal 5'may be disposed in the joint portion 32 by utilizing the seal mounting portion 31s. Then, when the segment seal 5 ′ is sandwiched between the adjacent segments 31, 31,
The adhesive 7 is evenly applied to the entire surface of the segment seal so that the side surface portion of the segment seal and the joint surface 31a of the segment 31 are completely adhesively connected, or such segment seal is attached to the segment 31 in a predetermined manner. The work of positioning at the attachment position is relieved from the need to be carried out extremely strictly, and the construction is simplified, and the same or more effective waterproofing effect as when using the mounting mode shown in FIG. 2 is obtained. I can.

That is, the segment seal 5'shown in FIG.
In order to dispose the segment seal 5'in the joint portion 32 between the segments 31 shown in FIG. 6, the segment seal 5'has a width W1 formed in a stress-released state like the segment seal 5 shown in FIG. Width W of the parts 31s, 31s
It is formed in a shape wider than 3. Then, the segment seal 5'having a width W1 is attached to the seal mounting portion 31 having a width W3.
s, 31s are positioned so as to match with each other, and the joint portion 32 between the adjacent segments 31, 31 is formed by the connecting operation of the adjacent segments 31, 31 described above.
If the seal mounting portion 31s is formed in a groove shape, the segment seal 5'can be installed easily and reliably with less labor. At this time, needless to say, the adhesive 7 may be used to connect the elastic body 6 ′ of the segment seal 5 ′ and the segment 31, but in the case shown in FIG.
It is also possible to inject the seal mounting portion 31s after the completion of the installation. In this way, the joint portion 32 is disposed,
Each of the segment seals 5 ′ having the original width W1 has a groove shape, and the segment ring 30 is deformed due to being positioned and arranged in the seal mounting portion 31s having a substantially predetermined width W3 by the opposing arrangement thereof. Therefore, even when the joint portion 32 between the segments 31 and 31 expands and contracts, the sealability can be stably exhibited in the joint portion 32 without concern that the joint portion 32 moves to the outside of the seal mounting portion 31s. Further, the segment seal 5'shown in FIG. 6 is not exposed to the tunnel space 3s or the ground 2, and thus the elastic body 6'may be damaged or the segment seal 6'may deteriorate. Avoided as much as possible from sex. Furthermore, since the water expander 10 'is not exposed to the ground 2 side or the tunnel space 3s side, the water expander 10' is submerged and expands during construction. Only when there is no danger and a large opening such that the elastic body 6 ′ is broken occurs, the water expansion body 10 ′ expands in water, and the joint portion 32 can be suitably sealed with the volume.

In the above-described embodiment, the water expanders 9 and 10 made of water-expandable rubber formed in a double-folded or I-shape are replaced by the elastic body 6 made of elastic vinyl chloride.
Although the example of arranging in the water expansion body mounting regions 6s and 6p formed inside 6'is described, the seals according to the present invention such as the segment seals 5 and 5'have a shape corresponding to the member gap to be stopped. As long as a water expandable body that is expandable by contact with water is provided in the region formed inside the elastic body, the detailed shape and the like may be those other than those described in the embodiments. It doesn't matter. Further, the shape of each segment 31, the method of assembling the segment 31, the properties of the adhesive 7 and the like are arbitrary. Further, in the embodiment, the seal according to the present invention is used as the segment seals 5 and 5 ′, and the joint portion 3 which is a member gap between the segments 31 and 31 in the lining 3 is used.
Although the example of effectively preventing the water leakage of No. 2 has been described, the seal according to the present invention has exactly the same effect when the seal is arranged between the members so that the gap between the members to be stopped is expanded and contracted. Therefore, the application of the present invention is not limited to water leakage prevention in the lining 3 of the tunnel 1.

[0021]

As described above, according to the present invention, the elastic members 6, 6 ', etc., having the shape corresponding to the gap between the members such as the joint portion 32, etc., to be shut off are provided. Water expansion body storage areas such as water expansion body attachment areas 6s and 6p are formed inside, and water expansion bodies such as water expansion bodies 9 and 10 which are expandable by contact with water are arranged in the water expansion body storage area. Since the elastic body elastically deforms in a normal state, the elastic body seals the member gap to be stopped while following the expansion and contraction of the width W2 of the member gap to be stopped. In the unlikely event that the elastic body breaks, the water expansive body expands the void (SP) formed by the breaking of the elastic body by contact with water to close the void (SP), and the water expansive body stops the water. It is possible to seal the gaps between the parts to be made. Therefore, if the seal according to the present invention is applied as a segment seal for stopping water in a segment joint in a shield tunnel, for example, the width of the segment joint, which is a gap to stop water, expands and contracts due to the deformation of the segment ring. However, by elastically deforming the elastic body, the elastic body can seal the area while always effectively following the expansion and contraction. When a large opening is formed in the segment joint part which is the member gap to be stopped, the elastic body is broken, and in the member gap to be stopped by being arranged at the broken portion of the elastic body. A void (SP) is formed in Then, the water expansion body provided inside the elastic body communicates with the outside of the elastic body, that is, the region such as the ground 2 where the seal has stopped water, through the void formed by the breakage of the elastic body. It becomes a form to do.
Then, water such as pore water in the ground where the seal has stopped water until then comes into contact with the water expansive body through the void formed by the breakage of the elastic body. In this way, the water expansive body that has come into contact with water is water-expanded, and the voids formed in the member gaps to be stopped can be closed through the expanded volume. As a result, the seal is again shaped so as to close the member gap where the seal should stop water. Therefore, the ground 2 where the seal is still water
Water leakage in the form of infiltration from the area such as to the area to be stopped such as the tunnel space 3s is always prevented appropriately. At this time, the water expansive body is disposed in the water expansive body accommodating region formed inside the elastic body, so that the elastic body is protected by the elastic body itself until the elastic body breaks. Therefore, contact with water is blocked. Therefore, during the process of arranging the seal in the gap between the members to be stopped, the water expander comes into contact with water and expands water, which makes it difficult to obtain a further change in shape of the water expander. The situation is avoided. Therefore, when the elastic body is elastically deforming and seals the member gap to be stopped while the elastic body is elastically deforming, the water expander does not obstruct the gap, and a large opening occurs in the member gap to be stopped such as the segment joint part. In this case, as a member that suppresses the opening, the effect can be properly exhibited. Since the seal according to the present invention can be molded into a predetermined shape corresponding to the member gap to be stopped by factory processing, the seal is disposed in the member gap to be stopped. In this case, it is possible to simply arrange and construct this by simply sandwiching it between the members to be shut off. Then, by factory-processing the seal with the properties of the elastic body and water-expandable body and their shapes arbitrarily selected, the construction is easy, but it accurately corresponds to the environment of the member gap to be stopped. The seal can be arranged in a staggered manner. Therefore, the seal according to the present invention can always favorably seal the gap between members to be waterproofed such that the gap width repeatedly expands and contracts. Therefore, if the seal according to the present invention is applied to the segment joint portion in the tunnel, which is particularly required to be easily installed, it is possible to obtain a water leakage prevention effect that is simple and reliable.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view showing an example of a tunnel by a segment lining body using a seal according to the present invention.

FIG. 2 is a cross-sectional view showing a segment joint portion in the segment lining body shown in FIG.

FIG. 3 is a sectional view showing an embodiment of the seal according to the present invention, which is sandwiched between the segment joint portions shown in FIG.

FIG. 4 is a diagram showing a case where an opening is formed in the segment joint portion shown in FIG.

FIG. 5 is a diagram showing another embodiment of the seal according to the present invention.

6 is a cross-sectional view showing how the seal shown in FIG. 5 is attached to a segment joint portion.

[Explanation of symbols]

 5 ... Seal (segment seal) 6, 6 '... Elastic body 6s, 6p ... Water expansion body storage area (water expansion body mounting area) 9, 10 ... Water expansion body 32 .. (Joint part)

Claims (1)

[Claims] 1. An elastic body having a shape corresponding to a gap between members to be shut off, a water expansion body storage region is formed inside the elastic body, and the water expansion body storage region is contacted with water. A seal constructed by arranging an inflatable water expander.