JP3297133B2 - sticker - Google Patents

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 sealing member made of an elastic body formed in a belt shape is formed by forming an appropriate groove in a segment joint surface. In this regard, a water leakage prevention device which is provided here by being bonded to the groove is well known. At this time, since the segment is repeatedly deformed due to the temporal change of the earth pressure due to excavation, particularly during the construction, the gap between the joint surfaces of the segment is expanded and contracted. Is
If it is not possible to elastically deform following such expansion and contraction, it is not possible to sufficiently prevent water leakage.

[0003]

However, since such a sealing member is a fixed product previously processed into a band shape at a factory or the like from the viewpoint of simplicity of the construction, the sealing member cannot be used in the elastic deformation region. Only the expansion and contraction of the segment joint surface gap can be followed. For this reason, by the large deformation of the segment ring exceeding the elastic deformation region,
If a large aperture is formed on the joint surface, there is a risk that the seal member will break and leak water through the broken portion. Therefore, a water-swelling rubber made of urethane rubber or the like, which expands when it comes into contact with water, is used as a sealing member, and is expanded between adjacent segments by contact with water that infiltrates here.
There is also a method of closing an aperture formed on the segment joint surface. However, if such a water-swelling rubber is submerged when the segment ring is severely deformed during tunnel construction, the rubber expands in that state, and its shape is substantially fixed in the expanded state. The water-expanded rubber in the expanded state has a disadvantage that when the earth pressure changes after the completion of the construction and the segment ring is deformed again, it is difficult to follow the expansion and contraction of the segment joint surface gap caused by this. In view of the above circumstances, the present invention can always effectively follow expansion and contraction of a member gap to be sealed such as a segment joint surface gap, and
An object of the present invention is to provide a seal capable of sufficiently sealing even if a large aperture is formed in the member gap.

[0004]

That is, the present invention provides an elastic member (6) having a shape corresponding to a member gap (32) to be stopped.
(6 ′), wherein the elastic body forms an outer peripheral portion of the seal.
The elastic body is formed on the side of the elastic body.
Can be bonded to the members on both sides to be water-stopped through the surface
And 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) freely water-swelling material expands upon contact with water (9), and arranged (10), wherein
When the gap between the water-stopping members expands and contracts,
In the meantime, the elastic body is deformed so as to be elastically deformed, and the gap is
The member to be sealed and water-stopped is elastically deformed by the elastic body.
When the aperture is larger than the shape can follow
Means that the elastic body does not peel from the member to be water-stopped.
The elastic body itself is configured to break . The numbers and the like in parentheses are for convenience showing the corresponding elements in the drawings, and therefore, the description is not limited to the description on the drawings. The same applies to the following operation columns.

[0005]

According to the above construction, in the normal state, the present invention follows the expansion and contraction of the width W2 of the member gap (32) to be stopped by elastically deforming the elastic bodies (6) and (6 '). Meanwhile, the elastic bodies (6) and (6 ') seal the gap (32) of the member where water is to be stopped.
Is broken, the voids (SP) formed by breaking the elastic bodies (6) and (6 ′) are replaced with the water-expandable body (9),
The water expanders (9) and (10) act so as to seal the water gap (32) in which water is to be stopped in such a manner that (10) expands and closes upon contact with water.

[0006]

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

The tunnel 1 is, as shown in FIG.
And a lining 3 formed in a roll-over cylindrical shape so as to extend in the directions of arrows A and B, which are the excavation directions.
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 by the shield device (not shown) as the excavation means of the tunnel 1 in the ground 2 It is formed and constructed in the shape of a rollover cylinder connected to a wellhead wall. Between the lining 3 and the ground 2, an appropriate backing material is injected and filled in a substantially annular shape so as to connect and fix the lining 3 to the ground 2. The tunnel space 3 s is formed in a roll-over cylindrical shape corresponding to the shape of the inner peripheral surface 3 a of the lining 3. Lining 3
As shown in FIG. 1, the ring width of one ring is a width L1 and is constituted by a plurality of segment rings 30 which are sequentially connected in the arrow A and B directions in FIG. The segment ring 30 is formed by arranging precast concrete segments 31 each formed in a block shape having a circular arc shape along the lining shape of the tunnel 1 along arrows C and D, which are circumferential directions of the tunnel. It is constituted by a plurality of connected shapes so as to form an annular shape.

As shown in FIG. 1, each of the segments 31 is provided with a bolt box 33 at the inner four sides, that is, the arrow A, B and arrow C, D side edges on the tunnel space 3s side. However, in FIG. 1, a total of eight locations are provided, two at each side, and arrows A, B
Segments 31, 3 adjacent in the direction and arrows C, D
Each of the bolt boxes 33 provided at 1 is arranged at an alignment position so as to face each other. As shown in FIG. 2, each bolt box 33 is formed in a box-like shape so as to be depressed 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 direction or the arrow C, D direction are inserted into bolt holes 33 s formed in the respective bolt boxes 33. Each of them is fitted and fastened via a nut 36 with a predetermined torque.

In the lining 3, as shown in FIG. 1, joint portions 32 are provided between the segment rings 30 adjacent to each other in the directions of arrows A and B and the segments 31 adjacent to each other in the directions of arrows C and D. Each of the joint portions 32 has a segment seal 5 that can prevent water leakage from the joint portion 32. Are bolts 3 for fastening and connecting the segments 31 to each other.
5. Each of the segments 31 is disposed between the segments 31 via a nut 36. As shown in FIG. 2, the segment seal 5 is formed in a band shape along the shape of the joint portion 32, which is a member gap to stop water.
It has an elastic body 6 made of an elastic vinyl chloride material or the like having a waterproof property, and a mountain fold 6b is provided at the upper end of FIG.
The elastic body 6 is formed here so that the cross-sectional shape thereof is formed in a gate shape, that is, in a U-shape. The elastic body 6 forms the outer peripheral portion of the segment seal 5 and is a side surface of the segment seal 5. Side surfaces 6 a, 6 a shown on the left and right sides of the elastic body 6 in FIG. Through
It is directly adhered to each joint surface 31a, 31a of the segment 31, 31 adjacent in the arrow A, B direction or the arrow C, D direction. The elastic body 6 has a width W2 shown in the left-right direction of FIG. 2 of the joint portion 32 which is a member gap between the adjacent segments 31, 31.
When the lining 3 is deformed so as to expand or contract, that is, the lining 3 can be elastically deformed to follow the deformation, and the elastic body 6 is larger than the elastic deformation area of the elastic body 6. For the deformation of construction 3, the adhesive 7
1a, without being peeled off, along an assumed breaking line SL indicated by an alternate long and short dash line in FIG.
The elastic body 6 itself is configured to break.

As shown in FIG. 2, inside the elastic body 6,
A water-swelling body mounting area 6s is provided below the mountain-folded portion 6b as an area for accommodating a water-swelling body 9, which will be described later. The water-swelling body mounting area 6s has a mountain fold 6b formed at the upper end thereof, and both side surfaces 6a, 6a are adjacent to each other.
The elastic body 6 connected to the joint surfaces 31a, 31a of the first and the first 31 has a shape cut off from the ground 2 by itself. A water-swelling body 9 made of a water-swelling rubber such as urethane rubber which is expandable by contact with water is provided in the water-swelling body mounting area 6s in a band shape so as to fill the entire water-swelling body mounting area 6s. The water inflatable body 9 is in direct contact with the ground 2 in a normal arrangement state because the water inflatable body mounting area 6s in which the water inflatable body 9 is provided is cut off from the ground 2 via the elastic body 6 itself. It is in an unobtainable form.

At the upper end of FIG. 2 of the water expander 9, a mountain fold 9b is provided.
Is formed here in a form in which the water-expandable body 9 is formed in a folded shape, and the mountain-folded portion 9b of the water-expandable body 9 is formed.
Are arranged on the tunnel space 3s side shown in the lower part of FIG. The water inflatable body 9 is moved together with the elastic body 6 from the left and right directions 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 tightened in the pressed form, the inner surfaces 9c, 9c of the water expanding 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 W when it is in a tightened state at the joint portion 32 which is a member gap to be closed with water having a width W2 before the joint seal 32 is disposed. As shown in FIG. 3, the shape is contracted in the left-right direction in FIG. 2 from the width W1 in the stress released state. In addition, the water expansion body 9
The side surfaces 9a, 9a of the elastic body 6
It is in the form of fusion bonding.

Since the tunnel 1 has the above-described configuration, the tunnel 1 is constructed by using a shield device, and in an initial stage of the construction, an appropriate temporary construction is provided at a shaft or the like which is a shield start point. The ground 2 is excavated through the ground excavation means of the shield device in such a manner that a reaction force is obtained from a reaction base or the like, and then a propulsion reaction force is obtained at the front end of the lining 3. I will promote it inside. Each time the shield device is propelled by an amount corresponding to the width L1 of the segment ring 30, the segments 31 are connected in an annular shape along the arrows C and D, which are the circumferential directions of the tunnel, so that the segments having the width L1 are formed. The ring 30 is formed, the segment rings 30 are sequentially connected in the directions of arrows A and B, which are the axial directions of the tunnel, and this is connected and fixed to the ground 2 via a backing material to construct the lining 3. I will do it. That is, the lining 3 is built by connecting a plurality of segments 31 in the tunnel circumferential direction and the tunnel axial direction in the excavation tunnel 2 s excavated and formed by the shield device.
Is constructed by the lining 3 so as to support the earth pressure of the ground 2 around the lining 3 by segment rings 30 each having a width L1.

By the way, when the lining 3 is built by connecting a plurality of segments 31 along the tunnel circumferential direction and the tunnel axial direction, the segments 31 and 31 adjacent to each other in the directions of arrows C and D are required. Between the segment rings 30 adjacent to each other in the directions of the arrows A and B, the segment seals 5 are disposed on the joint portions 32 formed in a strip shape as the member gaps between the segments 31 and 31, respectively. Therefore, when each segment 31 is built, FIG.
As shown in FIG. 5, the adhesive 7 is applied to the left and right side surfaces 6a, 6a of FIG. 3 of the elastic body 6 by using the segment seal 5 in which the elastic body 6 is formed along the shape of each joint portion 32, for example. After each application, the side surface 6 on which the adhesive 7 is applied
a, 6a are bonded to the joint surfaces 31a, 31a, and the segment seal 5 is attached to the adjacent segments 31, 31.
They are sandwiched between them. In this state, as shown in FIG. 2, a bolt 35 is inserted into one of the bolt holes 33s from one of the bolt boxes 33 provided on the adjacent segments 31, 31 and the other bolt box 33 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 such a manner that the segment seal 5 is sandwiched between the segments 31, 31. The bolts 35 and the nuts 36 are subjected to appropriate repulsive force by the elastic force of the elastic body 6 and the water expanding body 9 constituting the segment seal 5 sandwiched and arranged in the joint portion 32, so that the bolts 35 and the nuts 36 are loosened. Is prevented, the adjacent segments 31, 31 can be suitably fastened and connected.

In this way, when the segments 31 are erected, the segment seal 5 is sandwiched between the adjacent segments 31, 31 in the directions of arrows A and B and the directions of arrows C and D. Each of the joint portions 32 of the plurality of segments 31 constituting the
The segment seals 5 are respectively arranged in a strip shape along the shape 2. Then, in the segment seal 5 provided in the joint portion 32, the side surfaces 6 a, 6 a of the elastic body 6 constituting the outer peripheral portion of the segment seal 5 are connected with the joints 31 of the segments 31 via the adhesive 7. The surfaces 31a, 31a are integrally connected. At this time, the adhesive 7 is applied to the segment ring 30 formed in a ring shape by arrows C,
A ring fastening force is generated between the segments 31 adjacent to each other in the D direction along the circumferential direction of the tunnel, or a shield propulsion jack connects the segment ring 30 to another segment ring 30 adjacent to the rear side thereof. , The adjacent segments 31 and 31 in the directions of arrows A and B are pressed against each other, and a bolt 35 and a nut 36 for fastening and connecting the adjacent segments 31 and 31 are formed. Of the elastic body 6 and the joint surface 31 of the segment 31 through the tightening force of
a and 31a can be firmly bonded and integrated. 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, as shown in FIG. Therefore, it is possible to prevent the pore water in the ground 2 from leaking into the tunnel space 3s.

By the way, during the 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, has not yet been stabilized.
Are often deformed, and as a result, the width W2 of each joint portion 32, which is the member gap between the adjacent segments 31, 31 in the directions of arrows A and B and the directions of arrows C and D, (Shown in FIG. 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
The joint portion 32 is formed in such a manner that the elastic members 6 and 9 elastically deform due to the elastic properties of the elastic member 6 and the water expanding member 9.
The tunnel space 3s can always be suitably sealed to the ground 2 while following the expansion and contraction of the tunnel. In particular, the elastic body 6 is formed such that a mountain-folded portion 6b is formed on the ground 2 side shown at the upper end portion in FIG. 2, and the cross-sectional shape of the elastic body 6 is formed in a gate shape, and the side surfaces 6a, When the width W2 of the joint portion 32 is contracted by the adhesive connection of the joint portions 32 to the joint surfaces 31a, 31a of the adjacent segments 31, 31, the water inflatable body mounting region from the side surfaces 6a, 6a is an inner region. The predetermined sealing performance is maintained while being pressed in the left-right direction in FIG. 2 toward the 6s side. And the joint part 3
When the width W2 of the second member 2 is increased, that is, when the openings are formed between the adjacent segments 31, 31, the elastic body 6 has the side surfaces 6a, 6a adhesively connected to the joint surfaces 31a, 31a, respectively. The water-swelling body mounting area 6s is easily expanded by being pulled by the joint surfaces 31a. The elastic body 6 in which the water expansion body mounting area 6s is expanded in this manner has the side surfaces 6a, 6a adhesively connected to the joint surfaces 31a, 31a of the adjacent segments 31, 31, thereby maintaining the tunnel space as before. 3 s can be isolated from the ground 2. That is,
The segment seal 5 is formed in such a manner that the elastic body 6 constituting the outer peripheral portion of the segment seal 6 smoothly and elastically deforms by utilizing its elasticity and its shape, thereby always following the expansion and contraction of the joint portion 32. Thus, water leakage through the joint portion 32 can be suitably prevented.

During or after the construction of the tunnel 1, the elastic body 6 of the segment seal 5 is elastically deformed at the joint portion 32 which is a member gap formed between the adjacent segments 31, 31 as described above. In the event that a large aperture is formed that can follow this,
The segment seal 5 has its elastic body 6
As shown in FIG. 4, the elastic body 6 itself does not peel off from the joint surfaces 31 a, 31 a, and does not peel off from the joint surfaces 31 a, 31 a, and along the assumed breaking line SL along the extension direction of the joint portion 32. Break. As a result, as shown in FIG. 4, the elastic body 6 has a water-swelling body mounting area 6 which is a region formed inside the elastic body 6 along a break line SL.
s and the ground 2 are formed so as to communicate with each other. At this time, the range of the water-swelling body mounting region 6s of the elastic body 6 is expanded in a form corresponding to the opening of the joint portion 32. That is, a new gap (SP) is formed in the joint portion 32, which is a member gap to be stopped by the breakage of the elastic body 6, in a shape surrounded by a dashed line. Then, in the segment seal 5 provided in the joint portion 32, the water expansion body 9 which is expandable by contact with water is provided in the water expansion body mounting region 6s, and the ground 2 is formed before the fractured portion 6c is formed. The water-swelling body mounting area 6s is provided so as to fill the whole of the water-expanding-body mounting area 6s in a form held so as not to directly contact with the water. (SP) is formed, and the ground 2 is communicated with the water expansion body mounting area 6s through the gap (SP). As a result, the water expansion body 9 comes into contact with the pore water in the ground 2 as described above, so that the water expansion body 9 is expanded by the area of the water expansion body mounting area 6s, that is, by the amount corresponding to the new gap (SP). The water expands as shown by the hatched portion in FIG. In this manner, the water expandable body 9 which has been expanded as shown in FIG.
In this way, the tunnel space 3s is again isolated from the ground 2 in a form in which the gap (SP) formed in the joint portion 32 is closed by the area expansion of the water expansion body mounting area 6s due to the breakage of the elastic body 6. As a result, the segment seal 5 is formed by the member volume of the elastic body 6 and the water expansion body 9 so that the adjacent segment 3
The joint portion 32 between the first and the first 31 is again prevented from leaking water.

As shown in FIG. 5, the segment seal provided in the joint portion 32 has a water-expanding body mounting region 6p, which is a region for accommodating the water-expanding member, as shown in FIG.
There is also a segment seal 5 ′ provided inside the elastic body 6 in a form surrounded by the elastic body 6. Each of the segment seals 5 ′ shown in FIG. A water expansion body 10 made of the same material as the water expansion body 9 and arranged in two rows on the left and right in FIG. Thereby, the segment seal 5 ′ shown in FIG. 5 is configured such that the elastic body 6 elastically deforms, thereby following the expansion and contraction of the width W2 of the joint portion 32, which is the gap between the members to be stopped, and the elastic body 6 ′. When the elastic body 6 'is broken, that is, when a large opening is formed in the joint part 32, the water expandable body 10' expands due to contact with water and seals the joint part 32 itself. The water expansion body 10 ′ can seal the joint portion 32 in this manner so as to close 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 expandable body 10 disposed in the water expandable body mounting area 6 p can be used until the elastic body 6 ′ is broken. 6 '
The joint portion 32 can be sealed in such a form that only the elasticity thereof is expressed in a form always protected by the water, and the water expandable body 10 expands in water only when the elastic body 6 ′ is broken. Therefore,
The effect of preventing water leakage in case of emergency is kept high. The manner of disposing the segment seals 5, 5 ′ in the lining 3 is arbitrary, and may be in a form corresponding to the waterproofness required for the joint portion 32 of the lining 3, or the workability, ground properties, and 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 31 a of the segment 31. , A groove-shaped seal mounting portion 31s, the seal mounting portion 31s of each 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 on the joint portion 32 using the seal mounting portion 31s. Then, when the segment seal 5 ′ is sandwiched between the adjacent segments 31, 31,
An adhesive 7 is uniformly applied to the entire surface of the segment 31 so that the side surface portion of the segment seal and the joint surface 31a of the segment 31 are completely bonded to each other. The work of positioning at the attaching position is released from the necessity of performing it extremely strictly, and the construction is simplified, and the same or more effective water stopping effect as in the case of using the mounting mode shown in FIG. 2 can be obtained. I can do it.

That is, the segment seal 5 'shown in FIG.
In order to dispose at the joint portion 32 between the segments 31, 31 shown in FIG. 6, the segment seal 5 'has a width W1 formed in a state where the stress is released similarly to the segment seal 5 shown in FIG. Width of part 31s, 31s approximately W
It is formed in a shape wider than 3. Then, the segment seal 5 ′ having the width W1 is replaced with the seal mounting portion 31 having the width W3.
s, 31s, and the joints 32 between the adjacent segments 31, 31 are connected by the connecting operation of the adjacent segments 31, 31 described above.
In this case, since the seal mounting portion 31s is formed in a groove shape, it is possible to easily and surely perform the work of arranging the segment seal 5 ′ with less labor for construction. At this time, 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. Thus, the joint portion 32 is disposed.
Each of the segment seals 5 ′ having the original width W1 is formed in a groove shape, and is positioned and disposed in the seal mounting portion 31 s having a substantially predetermined width W3 by the opposing arrangement. Accordingly, even when the joint portion 32 between the segments 31 and 31 expands and contracts, the joint portion 32 can stably exhibit its sealing property without fear of moving out of the seal mounting portion 31s. The segment seal 5 'shown in FIG. 6 has a risk that the elastic body 6' is damaged or the segment seal 6 'is deteriorated because the segment seal 5' is not exposed to the tunnel space 3s or the ground 2. Avoided from sex as much as possible. Further, since the water expansion body 10 'is not exposed to the ground 2 side or the tunnel space 3s side, the water expansion body 10' is submerged and expands during construction. Only when there is no danger and when a large aperture occurs such that the elastic body 6 'breaks, the water expandable body 10' expands in water and the joint 32 can be suitably sealed with its volume.

In the above-described embodiment, the water expanders 9 and 10 made of water expandable rubber formed in two folds or I shape are replaced with the elastic bodies 6 made of elastic vinyl chloride.
Although the example in which the water inflatable body mounting regions 6s and 6p formed inside 6 ′ are provided has been 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. In a region formed inside the elastic body, if a water expandable body that is expandable by contact with water is provided, the shape of the details and the like may be a configuration other than that described in the embodiment. No problem. In addition, the shape of each segment 31 and the method of embedding it, and the properties of the adhesive 7 and the like are arbitrary. Further, in the embodiment, the joint portion 3 which is a member gap between the segments 31 in the lining 3 is used by using the seal according to the present invention as the segment seals 5 and 5 ′.
Although the example in which water leakage was effectively prevented was described above, the seal according to the present invention has exactly the same effect when it is disposed between members in which the gap between members to be stopped is expanded and contracted. Thus, the application of the invention is not limited to the prevention of water leakage in the lining 3 of the tunnel 1.

[0021]

As described above, according to the present invention, the elastic members such as the elastic members 6 and 6 'having a shape corresponding to the gap of the member such as the joint portion 32 to be stopped are provided. Of the seal
The elastic body is formed in a shape that constitutes an outer peripheral portion,
The side members of the elastic body are opposed to the members on both sides to be stopped.
And a water-expandable body storage area such as a water-expandable body mounting area 6s, 6p is formed inside the elastic body.
Water expanders such as water expanders 9 and 10 which are expandable by contact with water are provided in the water expander housing area, and the elastic body
When the gap between the members to be water stopped expands and contracts,
The elastic body deforms in an elastically deformable manner, sealing the gap
The member to be water-stopped is caused by the elastic deformation of the elastic body.
If the aperture is too large to follow
The elastic body does not peel off from the member to be waterproofed,
Since the body is configured to break itself , in a normal state, the elastic body elastically deforms, so that the elastic body stops water while following the expansion and contraction of the width W2 of the member gap to be stopped. In the event that the gap between members to be sealed is sealed and the elastic body breaks, the gap (S
P), the gap between the members where the water expander should stop water can be sealed in such a manner that the water expander expands due to contact with water and closes it. Therefore, if the seal according to the present invention is applied, for example, as a segment seal for stopping water at a segment joint portion in a shield tunnel, the width of the segment joint portion, which is a gap to stop water, expands and contracts due to deformation of the segment ring. Even if the elastic body is elastically deformed, the elastic body can seal the expansion and contraction while always effectively following the expansion and contraction. When a large opening is formed in the segment joint portion, which is the gap between the members to be stopped, the elastic body is broken, and the elastic gap is disposed in the broken portion of the elastic body. To the gap (S
P) is formed. Then, the water expansion body provided inside the elastic body communicates with the outside of the elastic body, that is, the area such as the ground 2 where the seal has been stopped, through the gap formed by the breakage of the elastic body. It takes the form. Then, water such as pore water in the ground where the seal has stopped water contacts the water expanding body through the void formed by the breakage of the elastic body. In this way, the water expandable body that has come into contact with water undergoes water expansion, and can close the gap formed in the member gap to be stopped by the expanded volume. This again causes the seal to close the gap between the members where the seal is to stop water.
Therefore, water leakage in the form of intrusion from the area of the ground 2 or the like where the seal is shut off into the area to be shut off such as the tunnel space 3s is always suitably prevented. At this time, the water-expandable body is disposed in the water-expandable body storage area formed inside the elastic body, so that the water-expanded body is protected by the elastic body itself until the elastic body is broken. And prevent contact with water. Therefore, during the process of arranging the seal in the gap between the members where water is to be stopped, the water-expandable body comes into contact with water and expands, and it is difficult to obtain a further change in shape of the water-expandable body. situation Ru is avoided. Therefore, the water expansion body is
When the elastic body elastically deforms and seals the gap between the members to be water-stopped, this is not hindered. The effect can be appropriately expressed as a member that suppresses. In addition, the seal according to the present invention can be molded into a predetermined shape corresponding to a member gap to be stopped by factory processing,
In order to dispose the seal in the gap between the members to be water-stopped, the seal can be simply arranged and installed between the members to be water-stopped. The seal is factory-processed with the properties of the elastic body and the water-swelling body and their shapes selected arbitrarily. In such a form, the seal can be provided. Therefore, the seal according to the present invention can always suitably seal a gap between members to be water-stopped such that the gap width repeatedly expands and contracts. Therefore, if the seal according to the present invention is applied to a segment joint portion in a tunnel where the simplicity of construction is particularly required, the construction can be simplified and a reliable water leakage preventing effect can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a 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 sandwiched between the segment joint portions shown in FIG. 2;

FIG. 4 is a diagram showing a case where an opening occurs in a segment joint portion shown in FIG. 2;

FIG. 5 shows another embodiment of the seal according to the invention.

FIG. 6 is a cross-sectional view showing a state in which 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-expandable body storage area (Water-expandable body mounting area) 9, 10 ... Water-expandable body 32 ... Water-stopping member gap (Joint part)

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 11/38

Claims (1)

(57) [Claims] 1. A shape corresponding to a gap between members to be stopped.
Having an elastic body,The elastic body is formed so as to form an outer peripheral portion of the seal.
And The elastic body should stop the water through a side surface of the elastic body
It is possible to adhere to the members on both sides,  A water expansion body storage area is formed inside the elastic body, and the water expansion body storage area is expandable by contact with water.
A water expansion body,In the elastic body, the gap between the members to be stopped is expanded and contracted.
At this time, the elastic body is deformed in an elastically deformable form,
And the member to be water-stopped is the elasticity of the elastic body.
When the aperture is larger than the amount that can be followed by deformation
Means that the elastic body does not peel from the member to be water-stopped.
So that the elastic body itself breaks Composed, sea
Le.