JP2678575B2 - Circumferential joint structure of water stop members in flexible joints of underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

INDUSTRIAL APPLICABILITY The present invention has unit blocks of underground construction such as water supply and sewerage, subways, common ditches, caves, underground passages, underground malls and various underground tunnels arranged along the periphery of the unit blocks. The present invention relates to a joint structure that joins and integrates a circumferentially divided water-stop member in a flexible joint that is relatively displaceably coupled via a water-stop member.

[0002]

2. Description of the Related Art As a flexible joint which is interposed between unit blocks of an underground structure such as water and sewage systems, subways, common ditches, tunnels, underpasses, underground malls or various underground tunnels so as to relatively displace the unit blocks. Examples are those configured as described in, for example, Japanese Patent Publication No. 61-37515 or Japanese Patent Publication No. 63-58982, which are proposed by the present applicant.
This is because the frame bodies along the outer circumference are fixed to the opposing ends of the unit blocks that form the underground structure, and the annular water-stop member formed of an elastic body such as rubber or synthetic resin on both frame bodies. Each side edge is watertightly fixed,
The water stop member is configured to stop water while allowing relative displacement of the unit blocks due to uneven subsidence of the ground.

[0003]

In the above-mentioned conventional joint structure, the water blocking member must be annular corresponding to the frame. However, it is often difficult to install it in a ring shape because the track and electric wiring and other pipes under construction are arranged inside the underground construction under construction, and one place is a strip shape. It is carried in to the site, and after avoiding obstacles and handling it, the ends are joined and fixed to the frame as an annular shape. However, the joining of the end portions must be performed so as to have watertightness and flexibility, and vulcanization must be performed using a press machine, which is extremely troublesome and requires skill and time for the work. There was a problem of this.
In addition, it is often necessary to interrupt other work during the joining work, for example, in the construction by the shield construction method,
Since the shield cannot be propelled during the joining work, the progress of the work was hindered.

Even if it is possible to carry it in and construct it on site in the form of a ring, there is a problem in that the handling of large products is troublesome and the workability in transportation and construction is poor.

The present invention has been made in view of the above problems, and it is possible to easily join the divided ends of the water blocking member in a short time with watertightness and flexibility. An object of the present invention is to provide a joint structure of circumferential end portions of a water blocking member in a flexible joint of an underground structure, which can improve workability during construction and can suppress influences on other constructions.

[0006]

The joint structure of the circumferential ends of the water blocking members in the flexible joint of the underground structure of the present invention which achieves the above-mentioned object has a unit block which constitutes the underground structure, along the periphery thereof. In a flexible joint that is relatively displaceably coupled via a water stop member arranged as a unit, a joint structure for integrally joining the water stop members divided in the circumferential direction, A coupling edge portion is provided so as to project along the edge of the stump portion, the split end surfaces are abutted against each other, and the coupling edge portion is provided on the outer side surface thereof along the edge portion. It is characterized in that it is fastened by a fastening means via a holding member, and the plurality of holding members are arranged such that adjacent ones are relatively rotatable.

Further, the pressing members are arranged such that adjacent ones are arranged with a predetermined interval, and the pressing members are pivotally attached to each other at their end portions. It is characterized in that it is formed into a chain.

Further, the pressing member is characterized by being connected by a deformable flexible connecting member.

[0009]

In the joint structure of the circumferential ends of the water blocking member in the flexible joint of the underground structure constructed as described above, the joining edges of the two divided ends of the water blocking member are formed on the outer surface thereof. Since they are fastened via a plurality of pressing members that are arranged so as to be rotatable relative to each other along the edge portion, the joint end surfaces are in close contact with each other to maintain watertightness, and the relative unit blocks of the construction are In the case of displacement, the coupling edge is bent by mutual rotation of the pressing member to allow this.

Further, in the case where the pressing members adjacent to each other are arranged with a predetermined interval, the connecting edge portion is bent at the interval portion of the pressing member to allow the deformation of the connecting edge portion.

Further, in the case where the pressing members which are adjacent to each other are pivotally attached to each other so as to form a chain, a high water-stopping property can be obtained by pressing the connecting edge portion uniformly over the whole. Bending at the pivot point allows deformation of the connecting edge.

Further, in the case where the pressing member is connected by the deformable flexible connecting member, the deformation of the flexible connecting member allows the deformation of the connecting edge portion.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of an underdrain connected by a flexible joint to which an embodiment of a joint structure of a circumferential end portion of a water blocking member in a flexible joint of an underground structure according to the present invention is applied, and FIG. FIG. Note that the joint portion of the water blocking member is not shown in FIG.

Reference numerals 1 and 2 denote underdrains as unit blocks formed by assembling segments into a circular cross section, and a concrete layer 3 is formed on the inner circumference by secondary lining. The underdrains 1 and 2 are joined by a flexible joint 4 so as to allow relative displacement.

The flexible joint 4 is, as shown in FIG. 2 which is a sectional view, the frame 1 fixed to the end faces of the underdrains 1 and 2, respectively.
Between the facing surfaces of 1 and 21, three layers of water blocking members each made of rubber to have flexibility (from the outer peripheral side to the primary water blocking member 5, the secondary water blocking member 6, and the inner circumferential side water blocking member). The members 7) are joined together, and the skin plates 41 are provided between the outer surfaces of the frames 11 and 21.
And a proof member 42 is provided between the secondary water blocking member 6 and the inner circumferential side water blocking member 7. 8 is a joint material interposed between the concrete layers 3 of the secondary lining.

The water blocking members 5, 6, 7 are carried into the construction site in the form of a single strip, and then both ends thereof are joined by the joining structure according to the present invention to form an annular shape along the perimeter of the underdrain 1, 2. And is attached to the facing surfaces of the frame bodies 11 and 21, and
21 are watertightly connected. In this embodiment, one strip-shaped both ends are joined to each other (that is, one joining portion) to form an annular shape. For example, the segment is divided into a plurality of segments having the same length as the segment constituting the underdrain. You may make it join. However, it is needless to say that it is preferable that the number of joints is small in consideration of the time and labor of joining, and the number of divisions may be set in consideration of workability of transportation, loading, and arrangement.

The load-bearing member 42 has a plurality of steel rods 42A fitted at opposite ends thereof into the side plates 11A, 21A of the frame bodies 11, 21 facing each other so as not to be detachable and relatively movable, at predetermined intervals in the circumferential direction. The steel rod 42A is arranged and a pipe 42B is externally inserted to the steel rod 42A. Due to the bulging of the secondary water blocking member 6 to the inner peripheral side due to the external pressure and the inner pressure of the inner peripheral side water blocking member 7. It acts to prevent bulging to the outer peripheral side.

Next, each water blocking member will be described in detail. As shown in FIG. 4, which is an enlarged cross-sectional view, the primary water blocking member 5 has mounting portions 51, 5 to the frame bodies 11, 21 on both side edges in the width direction thereof.
2 are formed respectively, and the central portion in the width direction is a flexible portion 53 having a semicircular slackened shape on the inner peripheral side.

A mounting portion 5 fixed to the frame 11 on the side of the underdrain 1.
1 is an L-shaped mounting portion formed by projecting an annular fixing flange 51A on the inner peripheral side of the side edge and forming an L-shaped cross section. The fixing flange 51A is a side plate 11B of the frame body 11.
Side plate 11B via a press-fixing plate 93 by a nut 92 that is screwed into a bolt 91 inserted from the inner side (the underdrain 1 side)
It is pressed and fixed to. As a result, the fixed flange 51A is in close contact with the side plate 11B and the outer surface plate 11C of the frame body 11 to obtain high water blocking performance.

A mounting portion 5 fixed to the frame 21 on the side of the underdrain 2.
2 is a flat type mounting portion whose edge portion is horizontally extended by a predetermined amount, and the outer surface plate 2 of the frame body 21 is fixed by a bolt 94.
It is pressed and fixed to the inner peripheral surface of 1C via a pressing plate 95. As a result, the mounting portion 52 causes the outer surface plate 21C of the frame body 21
It is possible to obtain high water-stopping property by closely adhering to the inner peripheral surface of.

In this embodiment, the mounting portion 51 on the side of the frame 11 and the mounting portion 52 of the frame 21 are made different in order to explain the constitution of the different mounting portions, which is functionally necessary. Therefore, it is needless to say that both sides may have the same configuration and can be appropriately changed.

The strip-shaped end of the primary water blocking member 5 is shown in FIG.
As shown in the side view in (A) and the front view in (B), the joining edges 54 (54A, 54B) of a predetermined height as joining edges are provided on the end faces on the side that becomes the inner peripheral side after joining both ends. It is projected along. A fitting water stop groove 5B extends in the width direction on one end surface 5A, and a fitting water stop projection 5D corresponding to the fitting water stop groove 5B projects on the other end surface 5C. The fitting water blocking projections 5D are fitted into the fitting water blocking groove 5B by abutting and closely contacting both end surfaces 5A and 5C. Then, as shown in FIG. 4, FIG. 5 which is a bottom view thereof, and FIG. 6 which is a BB cross-sectional view of FIG. A seat plate 55 serving as a pressing member is applied to the connecting edge 54A, 54B and the seat plate 5
Both coupling edges 54A, 54B are fastened by a fastening bolt 56 penetrating the holes 5, 55 and a nut 57 screwed to the bolt 56. That is, in the present embodiment, the fastening bolt 56
The nut 57 is a fastening means, and the fastening bolt 56 is a hexagon socket head cap screw. As a result, the primary water blocking member 5
Is fitted with the fitting waterproof groove 5D formed on the end surface 5C in the fitting waterproof groove 5B formed on the end surface 5A.
A and 5C are pressed into close contact with each other, and both ends are joined in a watertight manner to form an annular shape as a whole.

The upper and lower sides of the seat plate 55 are flexible parts 5
While being formed in a shape (arc shape) along the peripheral surface of 3,
The side edges of the seat plates 55 adjacent to each other are formed in the shape of an arc having an inverted concavo-convex shape, and the side edges of the adjacent seat plates 55 are set to have a predetermined interval. That is, the center seat plate 55A is formed in a convex arc shape whose both sides have a diameter approximately at the height thereof, and the left and right seat plates 55B adjacent thereto are formed in a concave arc shape on both sides. There is.

In the flexible portion 53, one seat plate 55 corresponds to one fastening bolt 56, and one fastening bolt 56 is provided so as to pass through the center of the seat plate 55.

A seat plate 55D of the L-shaped mounting portion 51 on the side of the underdrain 1
Corresponds to a horizontal portion between the flexible portion 53 and the fixed flange 51A, and fastening bolts 56 are arranged at both ends of the horizontal portion. Further, the mounting portion 51 has a fixed flange 51A.
The inner peripheral side of the joint portion of the bolt 5 is attached to the inner peripheral end surface of the side plate 11B.
The frame 11 is formed by the pressing plate 59A that is fastened by 8A.
The outer surface plate 11C is pressed against the inner peripheral surface of the outer surface plate 11C to enhance the waterproofness of the joint.

The seat plate 5 of the flat type mounting portion 52 on the side of the underdrain 2
5E corresponds to the base portion of the flexible portion 53 to the end portion of the mounting portion 52, and the fastening bolts 56 are respectively arranged at both ends thereof so as to penetrate therethrough. Further, the lower edge of the seat plate 55E is bent in the thickness direction of the coupling edge 54 to have an L-shaped cross section, and the lower surface of this bent portion corresponds to the inner peripheral edge of the side plate 21B of the frame body 21. The pressing plate 59B tightened by the bolt 58B is pressingly biased toward the upper side (outer peripheral side). As a result, the coupling edge 54 of the mounting portion 52 is pressed against the inner peripheral surface of the outer surface plate 21C of the frame body 21, thereby improving the water blocking performance of the joint portion.

Incidentally, the structure for fastening the connecting edge 54 via the seat plate 55 is configured by the bolt 56 penetrating and the nut 57 screwed to the bolt 56 in the present embodiment, but FIG. As shown in FIG. 7A, a female screw is cut on one of the seat plates 55F so that it also functions as a nut.
As shown in FIG. 7B, the bolt 56A is used as both screws and is tightened with nuts 57A from both sides. As shown in FIG. 7C, the bolt 56B is planted and fixed to one seat plate 55G and the other seat plate 55 side is fixed. From the viewpoints of workability and fastening function, it is possible to arbitrarily select from the viewpoints of workability and fastening function.

The primary water blocking member 5 constructed as described above is
The flexible portion 53 is elastically deformed to maintain the water blocking property and allow the relative displacement of the underdrains 1 and 2. That is, the slack of the flexible portion 53 decreases and becomes close to a straight line with respect to the displacement in which the joined underdrain 1 and 2 are separated from each other, and the slack in the flexible portion 53 with respect to the displacement in which the underdrain 1 and 2 are close to each other. growing.

In the joint portion, a connecting edge 54 is provided with a bolt 56 and a nut 5 via a seat plate 55 arranged along the flexible portion 53.
Although each of the seat plates 55 is fastened by 7, the seat plates 55 are discontinuous with the adjacent ones and have a predetermined distance between the side edges of the seat plates 55 and the adjacent ones of the adjacent ones. Bonding edge 54
Deforms while maintaining watertightness. That is, in order to join the joining edge 54 of the joining portion with watertightness in the initial setting state, it suffices to apply one continuous contact plate to the outer surface of the joining edge 54 and fasten it. However, this hinders the deformation of the flexible portion 53. On the other hand, in the present configuration, discontinuous seat plates 55 are arranged on the outer surface of the coupling edge 54 along the flexible portion 53 and are fastened to each other, so that the flexible portion 53 is prevented from being deformed. There is no such thing.

Here, in the above structure, the adjacent seat plates 55 are provided.
Since a space is provided between the sides of the joint edge 54, the joining pressure of the joint edge 54 (54A, 54B) is weak at the gap portion, and the watertightness may be reduced. In order to prevent such a situation, FIG.
As shown in FIG. 7, by embedding a thin metal pressure plate 54C at a position corresponding to the space portion of the seat plate 55 so that the outer surface is flush with the outer surface of the coupling edge 54, the tightening pressure is also applied to the space portion. Acts to press-contact the joint portion of the joint edge 54 and maintain watertightness over the whole. Deformation of the flexible portion 53 (coupling edge 5
4) is possible by the seat plate 55 sliding on the pressure plate 54C.

FIG. 10 is an enlarged sectional view of the joint portion of the secondary water blocking member 6. It is a second embodiment of the present invention to which a configuration similar to that of the primary water blocking member 5 described above is applied.

In the secondary water stop member 6, the flexible portion 63 is formed in a corrugated shape, and in a circularized state, it has a bellows shape as a whole. Mounting portions 61 and 62 similar to those of the primary water blocking member 5 are provided on both edges in the width direction, and are fixed to the frame bodies 11 and 21 via the mounting portions 61 and 62, respectively. The mounting portions 61 and 62 and the fixing structure to the frame bodies 11 and 12 via the mounting portions 61 and 62 are exactly the same as those of the above-mentioned primary water blocking member 5, and the description thereof will be omitted.

Similar to the primary water blocking member 5, the joint portion has connecting edges 64 projecting from both ends and fastened with fastening bolts 66 via seat plates 65.

The fastening bolt 66 is arranged at a position corresponding to the bent portion of the flexible portion 63, and the seat plate 65 has a circular shape in the seat plate 65A where the corrugated oblique side is bent outward. At the same time, the seat plate 65B at the portion where the oblique side of the corrugation bends inward is formed in an arc shape following the bending radius, and the seat plate 65C at the oblique side is formed in a substantially linear shape having a length corresponding to the oblique side. There is. Each seat plate 65 (65A, 65B, 65
C) has a predetermined distance from its neighbors.

Also in the secondary water blocking member 6 according to this structure, the joint edge 64 of the joint portion can be deformed in the space portion of the seat plate 65,
The joint portion is deformed while maintaining watertightness with the relative displacement of the underdrains 1 and 2.

The inner water stop member 7 has exactly the same construction as the secondary water stop member 6 and its explanation is omitted.

Next, another embodiment of the present invention will be described. In the embodiments described below, the parts having the same functions as those of the above-described embodiments are designated by the same reference numerals and the description thereof will be omitted.

11 to 13 show a third embodiment of the present invention, in which another embodiment of the pressing member is applied to the first water blocking member 5 in FIG. This is because the pressing member corresponding to the seat plate 55 in the first embodiment is a link 500.
(501, 502), and as shown in an enlarged view in FIG. 12, the ends of adjacent links 500 are pivotally attached to each other by a pin 510 to form a chain 50. That is, in the chain 50, as shown in FIG. 13 which is a cross-sectional view, the center link 501 has the fitting portions 501A having a thin plate thickness formed at both ends thereof, and the adjacent links 502 are fitted to the end portions thereof. Part 501A
Is formed with a slit 502A which is fitted therein, and is connected to the slit 502A so as to be relatively swingable by a pin 510 penetrating the fitting portion 501A in a fitted state. The thickness of the portion other than the fitting portion 501A of the link 501 and the thickness of the link 502 are set to be equal. Therefore, the chain 50 has a plate shape with a predetermined thickness as a whole, and the pin 510 is centered around the pin 510. It is bendable in a plane orthogonal to the axial direction of. The chain 50 configured as described above is applied to both outer surfaces of the coupling edge 54, and the coupling edge 54 is fastened by the fastening bolt 56 penetrating the center of each link 500 in the longitudinal direction.

In this structure, the chain 50 bends following the deformation of the flexible portion 53, and this does not hinder this. Further, since the entire area of the coupling edge portion 54 can be pressed uniformly, high water shutoff can be obtained, the number of the fastening bolts 56 can be reduced, and the whole is connected to one. Therefore, there is no fear that the components are lost, and the mounting workability is also improved.

14 to 16 show a fourth embodiment of the present invention. A washer 520 having a circular outer shape and a large plate thickness is used as a holding member corresponding to the seat plate 55 of the first embodiment, and this washer 520 is used. It is constructed by welding a metal plate 530, which is a flexible connecting member and is easily deformable, at predetermined intervals. FIG. 14 is an enlarged view of the joint portion, FIG. 15 is a view showing a state where the washers 520 are connected by the strip plate 530, and FIG. 16 is a sectional view thereof. Also with this configuration, since the whole is connected to one, there is no concern about loss of component parts and the like, and mounting workability is improved. High watertightness cannot be expected because the joint edge 54 cannot be pressed over the entire surface, but it is suitable for low pressure underdrain due to its simple structure.

Next, as a fifth embodiment of the present invention, an embodiment applied to a flexible joint having a structure different from the above will be described.

In the flexible joint structure shown in FIG. 17, steps 1A and 2A are formed on the inner peripheral sides of the opposite end faces of the connecting underdrains 1 and 2, and a frame body having a shape corresponding to the steps 1A and 2A, respectively. 11 and 21 are attached to the frame 11,
In FIG. 21, the water blocking member 100 is attached to the mounting portions 10 on both side edges in the width direction.
It is fixed via 1, 102. Protective materials 501 and 502 are provided on the inner peripheral sides of the mounting portions 101 and 102. The protective members 501 and 502 are provided so as to straddle a joint portion of the water blocking member 100 described later.

In the water blocking member 100, a flexible portion 103 which is narrowed toward the inner diameter side is formed in the center in the width direction, and both side edge portions are mounting portions 101 and 102.
Nuts 301, 30 in which screw threads 1, 102 are screwed into bolts 201, 202 planted in the steps 1A, 2A of the underdrains 1, 2
2 via the pressing plates 401 and 402,
It is pressed and fixed to 12. In the circumferential direction of the underdrains 1 and 2, they are joined to each other at a joining portion to form an annular shape.

As shown in the enlarged view of FIG. 18, the joint portion has the connecting edges 104 formed at both ends similarly to the above-described embodiments, and the end portions where the connecting edges 104 are formed are abutted with each other. , Are fastened from both sides by fastening bolts 106 via a plurality of link plates 105 as pressing members.

Similar to the third embodiment described above, the link plates 105 are arranged so that the ends thereof are overlapped with each other, but the fastening bolts 106 connect the overlapped portions to fasten the coupling edge 104. . As a result, the fastening bolt 106 functions not only as a fastening member but also as a pivot pin of the link plate 105. Fastening bolt 1
In addition to the overlapping portion, 06 is also arranged substantially in the center in the longitudinal direction of the central link plate 105A and the link plates 105B and 105C of the mounting portions 101 and 102, but this naturally does not function as a fulcrum pin.

In this structure, the link plate 105 swings around the fastening bolt 106 as a fulcrum, whereby the deformation of the coupling edge 104 is allowed and the flexible portion 103 is deformed. According to this,
The number of parts can be reduced by using the fastening bolts 106 to both pivotally attach the link plate 105 and fasten the coupling edge 104.

The flexible joint structure shown in FIGS. 19 to 20 is an example of a joint for a large depth which can withstand a high external pressure, as described in, for example, Japanese Patent Application No. 6-187778. The water blocking member having a flexible portion that is narrowed to the inner peripheral side is double (water blocking member 210, inner surface water blocking member 22
0), and the load bearing member 300 is disposed between them. The water blocking member 210 is joined in the same configuration as in the fifth embodiment.

The load-bearing member 300 is composed of two annular fixing rings 301 and 302 joined by a plurality of load-bearing rods 303 arranged at predetermined intervals in the circumferential direction, and the fixing rings 301 and 302 are stopped. Mounting part 21 for water member 210
1, 212 and mounting portions 221, 22 of the inner surface water blocking member 220
It is fixed to the frames 11 and 21 while being sandwiched between the two. The load bearing rod 303 is formed by bending a steel rod into a U-shape, and is formed by bending the flexible portion 213 of the water blocking member 210 and the inner surface water blocking member 22.
It is located in a U-shaped space formed between 0 flexible parts 223. Then, the water blocking member 210 is prevented from bulging toward the inner peripheral side by the external pressure, and the inner surface water blocking member 220 is also prevented from bulging toward the outer peripheral side by the internal pressure.

As shown in FIG. 20, the joint portion of the water shut-off member 210 has a connecting edge 214 projecting from the end portion, and the fastening bolt 215 is inserted through the link plate 201 as in the fifth embodiment.
Has been concluded by The link plates 201 are arranged so that the ends thereof are adjacent to each other, and the fastening bolts 215 communicate the overlapping parts. The coupling edge 214 is the water blocking member 21.
0 of the flexible portion 213 and the flexible portion 223 of the inner surface water blocking member 220.
It is located in a U-shaped space 400 formed between the bearings, and is positioned between the bearing rods 303 of the bearing member 300 in the circumferential direction so as not to interfere with each other.

In this embodiment, the link plate 201 swings around the fastening bolt 215 as a fulcrum, whereby the deformation of the coupling edge 214 is allowed and the flexible portion 213 is deformed. Bonding edge 214
Since it is located in the installation space of the load-bearing member 300, it is not necessary to newly secure a space for accommodating the coupling edge 214, and the structure can be rationalized.

In addition to the above, the present invention is, for example, Japanese Patent Application No.
It is also applicable to the flexible joint for large depth described in each specification of Japanese Patent Application No. 186439, Japanese Patent Application No. 6-187779, Japanese Patent Application No. 6-132625, Japanese Patent Application No. 6-152608.

[0052]

As described above, according to the joining structure of the circumferential ends of the water blocking members in the flexible joint of the underground structure according to the present invention, both the joint edges of the flexible water blocking members are joined together. Since the outer surface is fastened from the outside through a plurality of pressing members, the joint surface of the connecting edge portion is in close contact and watertightness is maintained, and bending is caused by mutual rotation of the adjacent pressing members. Yes, it is possible to allow relative displacement of the unit blocks of the constructs to be joined.

As a result, it becomes possible to easily join the divided ends of the flexible water blocking member with watertightness and flexibility, so that no skill is required for the joining work and the joining work is performed. It is possible to minimize the influence on the construction due to the long time. Further, since the water blocking member can be divided into small parts, it is possible to contribute to improvement of workability during transportation and construction.

Further, in a case where the adjacent pressing members are arranged with a predetermined interval, the connecting edge portion is bent at the interval portion of the pressing member to allow the deformation of the connecting edge portion.

Further, in the case where the end portions of the pressing members adjacent to each other are pivotally attached to each other to form a chain, the pressing member can press the entire surface of the connecting edge portion, so that the watertightness is ensured. The workability at the time of mounting is improved because the pressing member is connected, and the pressing member is connected by a deformable flexible connecting member.
It can be configured easily and workability at the time of mounting is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of an underdrain joint connection portion connected by a flexible joint to which an embodiment of a joint structure of a circumferential end portion of a water stop member in a flexible joint of an underground structure according to the present invention is applied.

FIG. 2 is a cross-sectional view of the joint coupling portion, which is a cross-sectional view taken along the line AA of FIG.

FIG. 3A is a side view of a divided end of the water blocking member,
(B) is a front view of the sectional surface.

FIG. 4 is an enlarged cross-sectional view showing a joint portion of the water blocking member.

FIG. 5 is a bottom view of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a view showing another embodiment of the fastening structure via the pressing member.

FIG. 8 is a cross-sectional view showing a joint portion of a water blocking member having a structure capable of enhancing watertightness.

FIG. 9 is a sectional view taken along the line CC in FIG. 8;

FIG. 10 is an enlarged cross-sectional view showing a joint portion of the water blocking member according to the second embodiment of the present invention.

FIG. 11 is an enlarged cross-sectional view showing a joint portion of the water blocking member according to the third embodiment of the present invention.

FIG. 12 is an enlarged view of a pressing member according to a third embodiment.

FIG. 13 is a sectional view of FIG.

FIG. 14 is an enlarged cross-sectional view showing a joint portion of the water blocking member according to the fourth embodiment of the present invention.

FIG. 15 is a view showing a pressing member according to a fourth embodiment.

FIG. 16 is a sectional view of FIG.

FIG. 17 is a sectional view of a joint connecting portion to which a fifth embodiment of the present invention is applied.

FIG. 18 is an enlarged cross-sectional view showing a joint portion of the flexible member of the fifth embodiment.

FIG. 19 is a sectional view of a joint connecting portion to which a sixth embodiment of the present invention is applied.

FIG. 20 is an enlarged cross-sectional view showing a joint portion of the water blocking member of the sixth embodiment.

[Explanation of symbols]

 1, 2 ... Underdrain (unit block of underground structure) 4 ... Flexible joint 5 ... Primary water blocking member (water blocking member) 5A, 5C ... End face (divided end face) 6 ... Secondary water blocking member (water blocking member) 50 ... Chain (pressing member) 54 (54A, 54B) ... Coupling edge (coupling edge part) 55 (55A, 55B) ... Seat plate (pressing member) 56 ... Fastening bolt (fastening means) 57 ... Nut (fastening means) 100 Water-stop member 104 ... Coupling edge (coupling edge portion) 105 ... Link plate (pressing member) 106 ... Fastening bolt (fastening means) 201 ... Link plate (pressing member) 210 ... Water blocking member 214 ... Coupling edge (coupling edge portion) ) 215 ... Fastening bolt (fastening means) 501, 502 ... Link (pressing member) 530 ... Strip plate (flexible connecting member)

Claims (4)

(57) [Claims] 1. A flexible joint for connecting a unit block constituting an underground structure so as to be relatively displaceable via a water blocking member arranged along the periphery thereof, wherein the water blocking member is divided in the circumferential direction. A joint edge structure for joining and integrating the above, wherein a joint edge portion is provided along the edge of the divided end portion of the water blocking member, and the joint end portions are abutted with each other and the joint edge portion Are fastened to the outer surface by fastening means via a plurality of holding members arranged along the edge portion, and the plurality of holding members are arranged such that adjacent ones are relatively rotatable. A circumferential joint structure of a water blocking member in a flexible joint of an underground structure, which is characterized by being provided. 2. The circumferential direction of a water blocking member in a flexible joint of an underground structure according to claim 1, wherein the pressing members are arranged such that adjacent ones have a predetermined interval. Joint structure. 3. The retaining member in a flexible joint of an underground structure according to claim 1, wherein the pressing member has a chain structure in which ends of adjacent members are pivotally connected to each other. Circumferential joint structure of water member. 4. The pressing member is connected by a deformable flexible connecting member.
A circumferential joint structure of a water blocking member in a flexible joint of an underground structure as set forth in.