JP2001227286A - Flexible joint part connecting structure in structure such as tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide flexible joint part connecting structure preventing formation of a clearance caused by the radial dislocation of connected structure bodies to sufficiently protect a water stop structure from a fire or the like in a tunnel. SOLUTION: This connecting structure for submerged caissons 2, 2 is provided with water stop rubber 3a, 3b for stopping water of the mutual connection part of the submerged caissons 2, 2' from the outside, and a fire resisting means for thermally protecting the water stop rubber. The fire resisting means comprises fire resistant plates 4, 4' provided along the inner peripheral walls of the respective submerged caissons, and an end insert member 5 connected to only either one of the submerged caissons to serve as the junction of the fire resistant plates between the submerged caissons. The fire resistant plates are provided in the state of the end parts projecting to the connection part, and the end parts of the fire resistant plates are respectively inserted loosely into the end insert member. A cavity between the end insert member and each loosely inserted end part is packed with a ceramic blanket 7 without a clearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for a structure constituting a tunnel structure such as a submerged tunnel or a shield tunnel, and more particularly, to a fireproof structure for preventing a decrease in water stoppage due to a fire in the structure. The present invention relates to a connection structure provided with:

[0002]

2. Description of the Related Art A submerged construction method has been proposed as one of tunnel construction methods in the sea and the like. In this method, a plurality of cylinders called buried boxes are manufactured on land in advance, floated on the water surface, towed to the laying point, laid down on the seabed,
The tunnels are constructed by connecting the buried boxes to each other.

[0003] On the other hand, in connection of such a submerged box, a sufficient water stopping property of the connecting portion is required, but a rubber material such as an O-ring constituting the water stopping structure itself has low heat resistance. is there. Therefore, if a fire or the like occurs in the tunnel during the construction of the tunnel or after the tunnel is opened, there is a danger that the fire may easily be degraded and destroyed, and a catastrophic event may occur due to the inflow of seawater from the connecting portion. For this reason, a structure that takes into account both the water resistance and the fire resistance has been adopted for connecting the buried boxes.

A conventional connection structure 100 for a submerged box will be described below.
This will be described with reference to FIG. Connection structure 100
Is to connect the embedding boxes 109 to each other by a tendon 101, a sheath tube 102 for penetrating the tendon 101 into the sink 109, and a coupler 103 for tensioning the tendon 101. Primary waterproof rubber 104 and secondary waterproof rubber 105 forming a water structure, and rigid foam urethane 10 forming a fire resistant structure
6, a rock wool 107 and a fireproof plate 108 are provided.

[0005] The primary waterproof rubber 104 is provided over the entire periphery between the peripheral projecting portions 109a of the submerged box to be connected, and directly blocks the inflow of seawater or the like into the tunnel.
An O-ring is used. The secondary waterproof rubber 105 is provided over the entire circumference so as to close the gap between the peripheral edge protruding portions 109a from the inside in a liquid-tight manner, and assists the primary waterproof rubber 104,
A rubber sheet or the like is used. These two waterproof rubbers (104, 105) work together to prevent seawater or the like from flowing into the submerged box 109.

The hard urethane foam 106 fills the space in the connection structure 100 and insulates the waterproof rubber (104, 105) from the inside of the immersion box 109 (the inside of the tunnel). Fireproof plate 10
Numeral 8 is provided on the inner peripheral wall of the submerged box 109 to prevent a flame or a fireball from coming into direct contact with the waterproof rubber (104, 105), the hard urethane foam 106, etc., and causing a fire. Is used. The rock wool 107 is a non-combustible sheet, and assists the function of the fireproof plate 108.

The refractory structures (106, 107, 10)
8) is adopted at least in the connection structure on the ceiling side of the tunnel, and when a fire or the like occurs in the tunnel, the waterproof rubber (10
4, 105) is prevented by the fireproof plate 108 and the like, and the melting of the water-stop rubber (104, 105) due to the temperature rise is prevented by the heat insulating effect of the hard urethane foam 106, thereby protecting the water-stop structure.

[0008]

On the other hand, a load in the shearing direction is sometimes applied to the immersion box, and the connected immersion boxes may slightly shift in the radial direction. In this case, in the conventional fireproof structure, the end 108a of the fireproof plate 108
Is a free end, the end 108a seems to be peeled off due to the displacement, and a gap is generated.

Such a gap allows heat or a flame to enter the inside of the connecting structure 100, melts the waterproof rubber (104, 105), and has a risk of destroying the waterproof structure. In this case, the rigid urethane foam filled in the connection structure 100 is a heat insulating material, but is not a non-combustible material. The danger of doing so was extremely high. If the inside of the tunnel becomes hot due to a fire or the like, the fireproof plate 108 may be warped. There was danger.

[0010] Accordingly, an object of the present invention is to generate a gap at the end of a refractory plate at a connecting portion of a structure in a submerged tunnel described above as a conventional technique or a tunnel structure including a shield tunnel. An object of the present invention is to provide a coupling structure of a flexible joint that prevents the occurrence of a gap due to a radial displacement between connected structures, and that can sufficiently protect a water stop structure against a fire in a tunnel. .

[0011]

According to the present invention, there is provided a water stopping means for externally stopping water at a connecting portion between structures constituting a tunnel structure such as a buried tunnel or a shield tunnel, and the water stopping means. And a fireproof means for thermally protecting the water-stopping means, wherein the fireproof means comprises an inner peripheral wall for each of the structures. A fire-resistant plate provided along with an end insertion member that is connected to only one of the structures and relays the fire-resistant plate between the structures, and the fire-resistant plate has an end portion thereof. The end of the refractory plate is loosely inserted into the end plug-in member, and the gap between the end plug-in member and the inserted end is nonflammable. It is noted that the insulation is packed tightly. Coupling structure of soft joint is provided to (claim 1).

According to this means, since the end of the refractory plate is loosely inserted into the end insertion member, displacement and deformation of the end are allowed within a range of play in the end insertion member. Is done. And by having said end insertion member connected only to any one of said structures,
If there is a radial displacement between the connected structures,
Although the deviation appears as a positional deviation of the end portion as it is, the non-combustible heat insulating material is packed without gaps in the gap between the end portion insertion member and the end portion loosely inserted therein, There is no gap. The same applies to the case where the end portion is deformed due to warpage of the fireproof plate.

Therefore, the connecting structure of the present invention prevents the occurrence of a gap at the end of the fire-resistant plate, and thus enables sufficient protection of the water-stopping structure against a fire in a tunnel or the like. It is possible to cope with radial displacement.

In the present invention, the structure constituting the tunnel structure is, for example, each buried box in a buried tunnel, a lining body in a shield tunnel, and a buried box in water or underground. Therefore, the connection part between the structures includes, for example, a connection part between the lining body in a shield tunnel and an underground structure such as a station. The soft joint portion is a joint portion that resists by expanding and contracting to a tensile force or a compressive force acting in the axial direction of the tunnel.
Rubber gasket against compression and P against tension
It can be formed from a C steel material, or can be formed from a bellows capable of withstanding both tensile and compressive forces. The hollow inside the structure refers to a portion finally corresponding to the inside of the tunnel. As the water stopping means, there is an O-ring or the like provided interposed between the connected structures. The term "thermal protection" refers to prevention of intrusion of a flame in a fire or the like in a tunnel, insulation of the inside of the tunnel, and the like.

As the refractory plate, a plate made of a non-combustible material such as a calcium silicate plate or a heat-resistant steel plate can be used, and it can be used as a single layer or a laminate. As non-combustible heat insulating material, alumina silicate fiber, mullite fiber,
There is a blanket made of ceramic fiber such as alumina fiber and zirconia fiber. Further, the end insertion member is formed of a nonflammable material such as ceramic (sintered body) and heat-resistant steel.

In the present invention, the refractory means is provided along an end insertion member provided on one of the structures and an inner peripheral wall of the other structure.
And a refractory plate extending to the end insertion member. The end of the refractory plate is loosely inserted into the end insertion member, and the end insertion member is loosely inserted into the end insertion member. A non-combustible heat insulating material may be filled in the gap with the end portion without any gap (claim 2).

The refractory plate provided on one of the structures extends to the other structure to cover the connecting portion. The end of the refractory plate is loosely inserted into the end group insertion member provided on the other structure, and corresponds to its displacement and deformation. The radial displacement between the structures appears as it is at the end of the refractory plate.

Further, in the present invention, the refractory means is provided with an end insertion member provided on each of the structures,
A fire-resistant plate interposed between the end insertion members, and connected to only one of the structures,
Further, both ends of the refractory plate are loosely inserted into the end insertion member, and a non-combustible heat insulating material is packed in the gap between the end insertion member and the inserted end without any gap. (Claim 3).

A separate refractory plate for covering the connecting portion is provided so as to extend between the structures. Both the structural bodies are provided with end insertion members, and both ends of the fireproof plate are loosely inserted into the end insertion members, respectively, to cope with displacement and deformation. Further, since the refractory plate is connected to only one of the structures, the radial displacement between the structures appears directly at the end of the refractory plate.

Still further, in the present invention, the refractory means is provided along an end insertion member provided on one of the structures and an inner peripheral wall of the other structure, and A refractory plate extending to an end insertion member, wherein the end of the refractory plate is loosely inserted into the end insertion member, and a non-combustible heat insulating material is provided on a vertically opposed surface of the end. A cavity as a clearance between the tip of the end portion and the end insertion member while allowing the behavior of the end of the refractory plate in the end insertion member in the structure axial direction. May be provided (claim 4).

In this case, when a displacement in the connecting portion in the axial direction of the structure, particularly a displacement in which the clearance of the connecting portion is compressed, the tip of the refractory plate can be freely moved in the end insertion member. It is configured such that the gap can be prevented from being generated. further,
For radial displacement, the end of the refractory plate is loosely inserted in the end insertion member, so that deformation is allowed within the range of play in the end insertion member, and the end of the refractory plate Since the non-combustible heat insulating material is packed without gaps between the upper and lower surfaces and the end insertion member, there is no gap.

The means for fixing the refractory plate extending to the connecting portion between the structures to one of the structures, wherein at least a member exposed in the tunnel is made of a non-combustible material such as a ceramic stud. It is preferable to use a member made of a conductive material. By using the fixing means made of a non-combustible material in this way, even if a fire occurs in the tunnel, heat conduction to the back surface of the refractory plate, i.e., the connection portion where the water stopping means and the like are present, is provided. Can be reduced.

[0023]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In this embodiment,
The connection structure of the flexible joint will be described particularly with reference to the connection structure of a submerged tunnel.

FIG. 1 is a cross-sectional view showing a connection structure of a flexible joint according to the present invention. The connection structure A includes a tendon 1a, a sheath tube 1b for penetrating the tendon 1a into the submerged box, and a coupler 1c for tensioning the tendon 1a.
Tension is applied to connect the buried boxes (2, 2,). In addition, the connecting structure A is provided with one water stopping means.
It has a secondary waterproof rubber 3a and a secondary waterproof rubber 3b to prevent seawater or the like from flowing into the tunnel. The structure for connecting and stopping the water is the same as the conventional connecting structure.
And the connection structure A is used as a fireproof means for protecting the water stopping means from fire and heat, and the inner peripheral wall (2a,
2a ') and a refractory plate (4, 4')
2 '), an I-shaped end plug-in member 5 for relaying a fire-resistant plate (4, 4') fixed to the inner peripheral wall (2a, 2a ') of the submerged box, and an I-shaped end plug-in member It comprises an L-shaped angle 6 for supporting 5 and a ceramic blanket 7 arranged in the gap from the I-shaped end insertion member 5 to the L-shaped angle 6.

The refractory plate (4, 4 ') is attached to the inner peripheral wall (2
a, 2a ') is directly fixed to the surface by an anchor 4b. The anchor 4b is, for example, an anchor made of a refractory material such as ceramic in order to enhance the heat insulation between the buried box (2, 2 ') itself and the inside of the tunnel. The end portions (4c, 4c ') between the refractory plates 4 which are continuously fixed on the inner peripheral walls (2a, 2a') of the immersion box are preferably cut diagonally as shown in the figure. This is because, when the refractory plates (4, 4 ') are warped, the ends (4c, 4c') slip over each other and overlap, so that a gap is hardly generated.

The I-shaped end insertion member 5 is a ceramic member having an I-shaped cross section, and is connected and supported only to one of the submerged boxes 2 via an L-shaped angle 6. In addition, between the upper and lower top plates (5a, 5b) of the I-shaped end insertion member 5, ends (4a, 4a ') of the refractory plates (4, 4') are loosely inserted left and right, respectively. The respective ends (4a, 4a ') of the refractory plates (4, 4') at the connection portion are relayed.

The ceramic blanket 7 is tightly packed in the gap between the end (4a, 4a ') of the refractory plate and the top plate (5a, 5b), and the refractory plate (4 , 4 '), especially the gap with the L-shaped angle 6. Since the ceramic blanket 7 has heat insulation and fire resistance, the inside of the tunnel and the waterproof rubber (3a,
3b) and also prevent direct ignition of the waterproof rubber (3a, 3b). In addition, ceramic blanket 7
Is a moderately flexible, I-shaped end plug
The movement (shift) and deformation of the end 4a of the refractory plate between the upper and lower top plates 5 (5a, 5b) is not restricted, and no gap is generated at the time of deformation or the like.

The L-shaped angle 6 is made of a ceramic material from the viewpoint of improving the heat insulating effect with respect to the inside of the tunnel.

In the connection structure A, a sufficient heat insulating effect for the inside of the tunnel can be obtained by the ceramic blanket 7 without arranging the hard urethane foam in the space in the connection structure as in the related art. To get
Even when this is arranged, the invasion of the flame is prevented by the ceramic blanket 7, so that the danger of ignition to the urethane is extremely small and there is no problem.

In the connection structure A having such a configuration, when a fire or the like in a tunnel occurs, the fireproof plate 4, the I-shaped insertion member 5 and the ceramic blanket 7 make the waterproof rubber (3).
Prevent heat transfer to a, 3b) and direct ignition.

In the case where a shearing load is applied at the boundary of the connection structure A and the connected buried boxes (2, 2 ') are displaced in the radial direction, the I-shaped end insertion member is used. Since 5 is connected to only one of the submerged boxes 2, the following conditions are at the ends (4 a, 4 a ′) of the refractory plates (4, 4 ′).

First, the end 4a of the refractory plate 4 on the side of the submerged box 2 to which the I-shaped insertion member 5 is connected is connected to the I-shaped end insertion member 5
There is no deviation, and since it moves in parallel with this, there is no change in the positional relationship between the end 4a of the refractory plate 4 and the I-shaped end insertion member 5. Therefore, no gap is formed at the end 4a.

On the other hand, the end 4a 'of the refractory plate 4' on the side of the submerged box 2 '
Will be shifted from the I-shaped end insertion member 5 by the shift between the buried boxes (2, 2 '). However, since the end 4a 'is loosely inserted between the top plates (5a, 5b), only a displacement occurs between the top plates (5a, 5b). And since the top plate (5a, 5b) is packed with the ceramic blanket 7, the end 4
There is no gap in a '.

From the above, regardless of whether or not the buried boxes (2, 2 ′) are displaced in the radial direction, the waterproof rubber (3
There is no change in heat insulation and fire resistance to a, 3b). Even if a fire in the tunnel occurs after such a gap, protect the waterproof rubber (3a, 3b) from the fire and heat sufficiently. Can be.

In addition, the case where the inside of the tunnel becomes high temperature due to the fire or the like and the refractory plate (4, 4 ') is warped to deform (displace) the end portions (4a, 4a') of the refractory plate. Even
Similarly, only the position of the end (4a, 4a ') is shifted within the space between the top plates (5a, 5b) of the I-shaped end insertion member 5, and no gap is formed by the ceramic blanket 7.

From the above operation, in the connection structure A, it is extremely unlikely that a gap is formed at the end portions (4a, 4a ') of the refractory plate, and the reliability of protection of the waterproof rubber (3a, 3b) against the fire in the tunnel is extremely high. effective.

Next, FIG. 2 is a sectional view showing a connection structure B of another flexible joint according to the present invention. Connecting structure B is a tendon
11a, sheath tube 11b and coupler 11c
2 ') Connect each other, and use primary waterproof rubber as a waterproof
13A and the secondary waterproof rubber 13b are the same as the connection structure A described above. The connecting structure B is used as a fireproof means. The fireproof board (14, 14 ') fixed to the inner peripheral wall (12a, 12a') of the submerged box, and the U-shaped end for relaying the fireproof board (14, 14 '). Part insertion member 15 and L-shaped angle 16 supporting fireproof plate 14
And a ceramic blanket 17 arranged in a gap from the U-shaped end insertion member 15 to the L-shaped angle 16.

The refractory plates (14, 14 ') are directly fixed to the surface of the inner peripheral wall (12a, 12a') of the submerged box by the anchor 4b. Then, the refractory plate 14 fixed to the immersion box 12 is extended to the immersion box 12 'through the connecting portion.

The U-shaped end insertion member 15 is a ceramic member having a U-shaped cross section. The U-shaped end insertion member 15 is fixed only to the submerged box 12 'so that the opening side faces the direction of the connecting portion. One end 14a of the refractory plate 14 is loosely inserted between 15a and 15b).

The ceramic blanket 17 has upper and lower top plates (15a, 15a, 15a, 15a) of the end portion 14a of the refractory plate and the U-shaped end insertion member 15.
b) The space between them is tightly packed without gaps.
4 It is packed into the gap between the upper surface and the L-shaped angle 16.

In the connecting structure B having such a configuration, similarly to the above-described connecting structure A, when a fire or the like in the tunnel occurs, the fire-resistant plate (14, 14 '), the U-shaped insertion member 15, and the ceramic blanket 17 are used. Prevents heat conduction to the waterproof rubber (13a, 13b) and direct ignition.

In the case where the connected sunk boxes (12, 12 ') are displaced in the radial direction, the end of the refractory plate 14 fixed to the sunk box 12 in accordance with the displacement.
14a is displaced in the U-shaped end insertion member 15 connected only to the submerged box 12 ', but no gap is generated by the ceramic blanket 17 packed in the U-shaped end insertion member 15.

Therefore, even if a fire in the tunnel subsequently occurs, the waterproof rubber (13a, 13b) can be sufficiently protected.
The same applies to the case where the fire-resistant plate 14 is warped and the end portion 14a of the fire-resistant plate is deformed, and the connection structure B has the same effect as the connection structure A.

Next, FIG. 3 is a cross-sectional view showing a connection structure C of yet another flexible joint according to the present invention. The connecting structure C is sunk by a tendon 21a, a sheath tube 21b and a coupler 21c (2
2, 22 ') are connected to each other, and are provided with a primary waterproof rubber 23a and a secondary waterproof rubber 23b as waterproofing means, as in the above-described connecting structures A and B. The connection structure C is used as a fire-resistant means. The fire-resistant plate 24 is fixed to the inner peripheral wall (22a, 22a ') of the submerged box and the fire-resistant plate 24 located at the connection portion.
a, an L-shaped angle 26 that supports the fireproof plate 24a, and two U-shaped end insertion members 25 that relay the fireproof plates 24 and 24a.
And a ceramic blanket 27 disposed in a gap from the U-shaped end insertion member 25 to the L-shaped angle 26.

In the connection structure C, the U-shaped end insertion member 25 is inserted into the submerged box (2) so that the opening side faces the connection portion.
2, 22 ') are installed at the ends, respectively, and between the upper and lower top plates (25a, 25b), the left and right ends 24b of the refractory plate 24a are loosely inserted, respectively.

The ceramic blanket 27 includes upper and lower top plates (25a, 25a) of the end portion 24b of the refractory plate and the U-shaped end insertion member 25.
b) Packed into the gap between them without any gap, and
It is packed into the gap between 4a and L-shaped angle 26.

In the connection structure C having such a configuration, similarly to the connection structures A and B described above, when a fire in the tunnel occurs or the like, the fireproof plates (24, 24a), the U-shaped end insertion member 25, and the ceramic Waterproof rubber (23a, 2
3b) prevents heat transfer and direct ignition.

In the case where the connected buried boxes (22, 22 ') are displaced in the radial direction, the refractory plate 24a is connected to the buried box 22, so that the right end of the drawing is used. The portion 24b will be displaced with respect to the submerged box 22 '.

However, the end portion 24b only shifts in the U-shaped end insertion member 25. Since the ceramic blanket 27 is packed in the U-shaped end insertion member 25, the end portion 24b is shifted due to the shift. 24b has no gap.

Further, even when the refractory plate 24a is warped due to a high temperature or the like and its both ends 24b are deformed, only the displacement occurs in each of the U-shaped end insertion members 25. The generation of a gap is prevented in the same manner as in the cooling.

Next, FIG. 5 is a sectional view showing a connection structure D of another flexible joint according to the present invention. Connecting structure D is a tendon
31a, the embedding boxes (32, 32 ') are connected to each other by a sheath tube (not shown) and a coupler 31c.
The point that the secondary waterproof rubber 33a and the secondary waterproof rubber 33b are provided is the same as the connection structures A to C described above, and the inner peripheral surface of the submerged box (32, 32 ′) is made of a refractory material such as ceramic. The fireproof plates (34, 34 ') are fixed to the respective anchor bolts 39a. The connecting structure D includes a fire-resistant plate 38 supported by an L-shaped angle 36 as fire-resistant means, and a fire-resistant plate 38
And an end insertion member 35 for relaying to a fireproof plate 34 fixed to the inner peripheral surface of one of the submerged boxes 32, and a ceramic blanket (3.
7a, 37b).

Here, the end insertion member 35 is formed of a plate body (35a, 35b) having a step, and one of the plate bodies 35b is connected to the fireproof plate 34.
Of the other plate 35a
Forms a gap with the inner peripheral surface of the submerged box 32, and the end 38a of the refractory plate 38 is loosely inserted into this gap. Then, the upper and lower surfaces of the end portion 38a of the refractory plate 38, that is, the inner peripheral surface of the end portion of the immersion box 32, and the plate 35a are attached to the ceramic blanket 37b
While the space is filled without gaps, a cavity 41 as a clearance is formed between the end of the end 38a of the refractory plate and the end insertion member 35, and the end 38a of the refractory plate 38 slides in the clearance. The movement of the refractory plate 38 in the direction of the tunnel axis is permitted by the movement.

Further, as shown in the figure, the refractory plate 38 is extended to the connecting portion of the submerged box (32, 32 '), and one end is provided in the submerged box.
The other end is in contact with the inner peripheral surface of the end 32 ', the other end is formed to be slightly thinner than the other part, and is loosely inserted into the end insertion member 35, and a ceramic blanket 37a is provided without a gap on the entire inner surface of the fireproof plate 38. Being laid, the refractory plate 38 is supported by the L-shaped angle 36 via a ceramic stud 39b together with a ceramic blanket 37a.

In the connection structure D having such a configuration, similarly to the connection structures A to C described above, when a fire in a tunnel or the like occurs, the fireproof plate 38, the insertion member 35, and the ceramic blankets (37a, 37b) are used. Prevents conduction of heat to the waterproof rubber (33a, 33b) and direct ignition.

Then, a positional displacement in the tunnel axis direction between the connected buried boxes (32, 32 '), for example, as shown by an arrow T in FIG. Fire plate 38, if any
End 38a merely slides in the cavity 41 sandwiched between the ceramic blankets 37b, and no gap is generated. On the other hand, as shown by an arrow C in FIG. 7, even when a displacement occurs such that the clearance of the connecting portion is reduced, only the end 38 a of the refractory plate 38 slides in the cavity 41. There is no gap.

Further, even in the case where the connected submerged boxes (12, 12 ') are displaced in the radial direction,
As shown in FIGS. 8A and 8B, the end 38a of the refractory plate 38
Presses one of the upper and lower ceramic blankets 37b, and the displacement due to the displacement is absorbed and no gap is generated.

Therefore, displacement in the axial direction of the tunnel,
Even in the event of a fire in the tunnel after the radial displacement, the waterproof rubber (33a, 33b) is sufficiently protected by the ceramic blanket (37a, 37b).

[Brief description of the drawings]

FIG. 1 is a sectional view showing a connection structure A of a flexible joint according to the present invention.

FIG. 2 is a cross-sectional view showing a connection structure B of another flexible joint according to the present invention.

FIG. 3 is a sectional view showing a connection structure C of still another flexible joint according to the present invention.

FIG. 4 is a cross-sectional view showing a conventional connection structure 100 of a submerged box.

FIG. 5 is a cross-sectional view showing a connection structure D of a flexible joint according to the present invention.

FIG. 6 is a cross-sectional view showing a state in which a positional displacement in the tunnel axial direction has occurred in the connection structure D of the flexible joint portion so that the clearance of the connection portion is enlarged.

FIG. 7 is a cross-sectional view showing a state in which a displacement in the axial direction of the tunnel occurs in the connection structure D of the flexible joint portion so that the clearance of the connection portion is reduced.

FIGS. 8A and 8B are cross-sectional views showing a state in which a radial displacement has occurred in the connection structure D of the flexible joint.

[Explanation of symbols]

 1a, 11a, 21a, 31a Strainer 1b, 11b, 21b, 31b Sheath tube 1c, 11c, 21c, 31c Coupler 2, 2 ', 12, 12', 22, 22 ', 32, 32' Submerged box 3a, 13a , 23a, 33a Primary waterproof rubber 3b, 13b, 23b, 33b Secondary waterproof rubber 4, 4 ', 14, 14', 34, 34 'Fireproof plates 4a, 24a, 38 Fireproof plates 14a, 38a Fireproof plate ends 5, 15, 25, 35 End insertion member 6, 16, 26, 36 L-shaped angle 7, 17, 27, 37a, 37b Ceramic bracket

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 000149136 Nippon Insulation Co., Ltd. 1-6-1, Oguni, Namiwa-ku, Osaka-shi, Osaka (71) Applicant 500067190 Ayumo Gesellschaft Mitsche Bech Länktel Haftung Germany 22393 Hamburg Zazera Bogen 3 (72) Inventor Osamu Kiyomiya 3-4-1 Okubo, Shinjuku-ku, Tokyo Waseda University Faculty of Science and Technology (72) Inventor Takaya Takimoto 2-26-2 Nishi-Nippori, Arakawa-ku, Tokyo Nihon Civic Consultant Co., Ltd. (72) Inventor Yoshifumi Fujii 8-2-1-1, Ginza, Chuo-ku, Tokyo Co., Ltd.Takenaka Civil Engineering Co., Ltd. (72) Inventor Nobuaki Chika 8-2-1-1, Ginza, Chuo-ku, Tokyo Co., Ltd. Inventor Kazuya Saito 1-14 Shinkawa, Chuo-ku, Tokyo -5 Inside of Tokyo Headquarters of Japan Insulation Co., Ltd. (72) Inventor Katsuaki Mizuno 40064-1 Kita-numa, Noda-shinta-ji, Hozumi-cho, Motosu-gun, Gifu Pref. Japan Production Co., Ltd. (72) Inventor Jun Adachi Germany Federal Republic 22393 Hamburg Hazenbeck 17 F-term (reference) 2D055 BA01 EA02 GD01 GD05 LA02 2D063 BA22

Claims (5)

[Claims] 1. A water stopping means for stopping water from the outside at a connection portion between structures constituting a tunnel structure such as a submerged tunnel or a shield tunnel, and an intervening member between the water stopping means and a cavity inside the structure. And in the connection structure of the soft joint portion comprising a fireproof means for thermally protecting the water stopping means, the fireproof means, a fireproof plate provided along the inner peripheral wall for each of the structures, An end insertion member that is connected to only one of the structures and relays the fireproof plate between the structures, and the fireproof plate is provided with an end protruding to a connection portion, In the end insertion member, the end of the fireproof plate is loosely inserted, and the gap between the end insertion member and the inserted end is filled with non-combustible heat insulating material without gap. The coupling structure of the soft joint part characterized by the above. 2. A water stopping means for stopping water from outside from a connection portion between structures constituting a tunnel structure such as a submerged tunnel or a shield tunnel, and an intervening member between the water stopping means and a cavity inside the structure. And in the connection structure of the soft joint portion provided with a fireproof means for thermally protecting the water stopping means, wherein the fireproof means, the end plug member provided in any one of the structure, and the other A fire-resistant plate provided along the inner peripheral wall of the structure and extending to the end plug-in member, wherein the end of the fire-resistant plate is loosely inserted into the end plug-in member, and And a gap between the end insertion member and the inserted end is filled with a nonflammable heat insulating material without any gap. 3. A water stopping means for stopping water from the outside at a connection portion between structures constituting a tunnel structure such as a submerged tunnel or a shield tunnel, and an intervening member between the water stopping means and a cavity inside the structure. And a connection structure of a soft joint portion having a fireproof means for thermally protecting the water stopping means, wherein the fireproof means comprises an end insertion member provided in each of the structures, and the end insertion. A refractory plate interposed between the members, and connected to only one of the structures, and both ends of the refractory plate are loosely inserted into the end insertion member, and A connection structure for a flexible joint portion, wherein a non-combustible heat insulating material is packed in a gap between the end insertion member and the inserted end portion without any gap. 4. A water stopping means for stopping water from outside from a connection portion between structures constituting a tunnel structure such as a submerged tunnel or a shield tunnel, and an intervening member between the water stopping means and a cavity inside the structure. And in the connection structure of the soft joint portion provided with a fireproof means for thermally protecting the water stopping means, wherein the fireproof means, the end plug member provided in any one of the structure, and the other A fire-resistant plate provided along the inner peripheral wall of the structure, and extending to the end insertion member, wherein the end of the fire-resistant plate is loosely inserted into the end insertion member,
While the non-combustible heat insulating material is tightly packed in the upper and lower surfaces of the end portion without gaps, the fireproof plate in the end portion insertion member is located between the tip of the end portion and the end portion insertion member. A coupling structure for a flexible joint, comprising: a cavity allowing movement of an end portion in a structure axial direction. 5. A means for fixing the refractory plate extending to a connecting portion between structures constituting a tunnel structure such as a submerged tunnel or a shield tunnel to one of the structures, wherein at least the inside of the tunnel is provided. The connecting structure for a flexible joint according to claim 4, wherein the fixing means exposed to the outside is formed of a nonflammable material.