JPH11229473A - Joint of closed conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen girder height and protect a flexible water sealing member by providing a joint frame body, an outer peripheral side receiving part support frame, an outer peripheral side receiving member, a flexible water sealing member and an inner peripheral side receiving member and providing the inner peripheral side receiving member with a push plate, a frame plate, a joint plate and a rib plate. SOLUTION: The frame plates 62, 63 of an inner peripheral receiving member 60 and the joint radial lengths of a joint plate and a rib plate 65 are formed smaller than the joint axial length of a push plate 61. Thereby the girder height of the inner peripheral side receiving member 60 can be suppressed at most half of the width of an inner peripheral flexible water sealing member. In addition, the push plate 61 of the inner peripheral side receiving member 60 adjacently arranged on the inner peripheral side prevents extension to the inner peripheral side by external water pressure of the inner peripheral side flexible water sealing member. An outer peripheral side receiving member 50 regulates extensio to the outer peripheral side of the inner peripheral flexible water sealing member by internal water pressure. Thus, girder height can be lessened. In addition, the flexible water sealing member can be sufficiently protected in response to internal and external pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a culvert joint used for connecting culverts such as water and sewage systems, subways, common ditches, and tunnels, and more particularly to a culvert joint that is thin and can sufficiently cope with internal and external pressures.

[0002]

2. Description of the Related Art As a joint of a culvert, a frame continuous in the circumferential direction is fixed to opposite ends of the culvert to be connected, and a short cylindrical member continuous in a circumferential direction by an elastic body such as rubber or synthetic resin. Both ends of the flexible water-stopping member formed in the above-mentioned manner are attached to the frame body in a water-tight manner, and the flexible water-stopping member stops water between the culverts. The structure is such that the relative displacement of the culvert is allowed to eliminate the stress acting on the culvert. In the joints of this type of culvert, when the flexible water blocking member intrudes into the inner peripheral side due to external pressure and enters between the opposite ends of the culvert, it interferes with the displacement absorption function of the culvert. It has means to prevent it.

[0003] For example, as shown in FIG.
The opposed portions of the annular anchoring boxes b and b 'attached to the respective end surfaces of the pair of culverts a and a' are formed of two layers of an outer peripheral flexible water blocking member c and an inner peripheral flexible water blocking member d. A plurality of rod-shaped load-bearing members e are annularly arranged at predetermined intervals in the circumferential direction between the outer-peripheral flexible water-stop member c and the inner-peripheral flexible water-stop member d, while being connected by the flexible water-stop member. It is configured.

[0004] A load bearing member e is provided on the outer periphery with side walls f,
A cylindrical body g slightly shorter than the initial interval at the time of construction f 'is loosely fitted, and its end is inserted into the anchoring boxes b and b' so as to be movable within a certain range and not to come off.

[0005] In this configuration, the outer peripheral flexible water blocking member c is responsible for stopping water against external water pressure, the inner peripheral flexible water stopping member d is responsible for stopping water against internal water pressure, and the bearing member e is anchor anchor f. , F 'are allowed to move relative to the culverts a and a' within a movable range. The bearing member e supports an outer flexible water blocking member c that swells inward due to an external pressure. Prevents it from leaning inward through the gap.

FIG. 8A shows a joint of another type of culvert. This joint is the one to be connected
Anchor members n, n 'each having attachment members m, m' of flexible water blocking member l are fixed to opposite ends of a pair of culverts k, k ', respectively, and between the anchor members n, n'. The flexible water-stopping member l is provided, and short cylinders o, o 'are provided in contact with the inner peripheral surface of the intermediate portion of the flexible water-stopper l. p '
The end of the flexible water-stopping member 1 is sandwiched between the mounting members m and m ', and is fastened and fixed by means of a vise vice Q and Q'.

[0007]

Recently, in order to reduce construction costs, there is a tendency to reduce the thickness of the main girder of the segment (girder height) and the thickness of the secondary lining concrete in joints of culverts. However, in the joint shown in FIG. 7, the girder height becomes extremely large because the inner peripheral side flexible water blocking member d is provided on the inner peripheral side of the cover e in addition to the provision of the cover e. Can not do it.

Further, the joint of the type shown in FIG. 8 does not have such an anti-cover, so that the girder height can be reduced.
As shown in (b), there is a possibility that the swelling may occur on the outer peripheral side due to the internal water pressure in a wide range and may be damaged.

As described above, in the conventional culvert joint, the type that can sufficiently protect the flexible water blocking member by coping with the internal and external pressures cannot reduce the girder height, and makes the girder height thinner. However, there is a problem in that the flexible water-stopping member cannot sufficiently protect the flexible water-stopping member in response to internal and external pressures.

The present invention has been made in view of the above-mentioned problems of the prior art, and can reduce the height of a girder (thickness of a girder) sufficiently and sufficiently cope with internal and external pressures to provide a flexible water-stopping member. It seeks to provide a culvert joint that can be protected.

[0011]

According to the present invention, there is provided a joint of a culvert, which is fixed to opposite end faces of a culvert to be connected, and which is continuous in a circumferential direction of the culvert. An outer-side receiving member support frame continuously provided in the circumferential direction of the culvert on the opposing end surfaces of the body, and an outer-peripheral side on the inner peripheral side of the outer-side receiving member supporting frame so as to be continuous in the circumferential direction of the culvert. The outer peripheral side receiving member fixed to the receiving member supporting frame, and the outer peripheral side receiving members of the two joint frame bodies are continuously connected in a circumferential direction of the culvert so as to be connected in a watertight manner between opposing end surfaces on the inner peripheral side of the outer peripheral side receiving member. A flexible water-stopping member made of rubber, synthetic resin, or the like, and a culvert at a predetermined interval between opposing end surfaces of the two joint frame members at positions adjacent to the inner peripheral side of the flexible water-stopping member. And an inner peripheral receiving member provided continuously in the circumferential direction of the inner peripheral side. The holding member is composed of a plurality of unit members divided in the circumferential direction, each unit member includes a pressing plate extending in the joint axial direction along the inner peripheral surface of the flexible water blocking member, and a joint axial direction of the pressing plate. A pair of frame plates extending from both ends to the inner peripheral side,
A pair of joint plates extending from both ends in the circumferential direction of the holding plate to the inner peripheral side, and a pair of joint plates extending from the inner peripheral surface of the holding plate to the inner peripheral side are disposed between the pair of joint plates. One or a plurality of rib plates are provided.

[0012]

According to the present invention, the girder height (dimension in the radial direction) of the inner peripheral side receiving member can be reduced, whereby the girder height of the entire joint can be reduced. In addition, by providing one or a plurality of rib plates between the joint plates at both ends, insufficient strength that can be caused by reducing the girder height of the inner peripheral side receiving member is compensated by increasing the thickness and / or number of the rib plates. The strength of the inner peripheral side receiving member can be set to a desired value.

In use, the bulging of the flexible water blocking member toward the inner periphery due to the external pressure is restricted by the inner peripheral receiving member, and the bulging of the flexible water blocking member to the outer peripheral side due to the internal pressure is prevented. Since the outer peripheral side receiving member regulates, the flexible water blocking member can be sufficiently protected against internal and external pressures.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of a joint of a culvert according to the present invention, and is a sectional view taken along the line AA in FIG. 2, which is a perspective view of the culvert connected by the joint.

The culverts 1 and 1 'are culverts having a circular cross section constructed by a shield method. The segments 10, 10' such as a steel segment, a concrete segment, and a ductile segment are assembled into a cylindrical shape to form an inner surface of a tunnel. The concrete layer 3 is formed by casting concrete as a secondary lining on the inner periphery thereof while lining the concrete layer.

The joint 2 is connected to each of the culverts 1 to be joined.
The joint frames 20, 20 'as two joint frame bodies fixed to the end surfaces of the outer peripheral flexible water-stopping member 30 made of rubber, synthetic resin and the like, and the inner periphery made of rubber, synthetic resin, etc. The side flexible water blocking member 40 is configured to be connected in a watertight manner. The two joint frames 20, 20 'are fixed to the opposite end faces of the culverts 1, 1', respectively, whereby the joint 2 is connected to the culverts 1, 20 '.
1 '. Left and right joint frames 20, 20 '
And the structure for mounting to the culverts 1 and 1 'are bilaterally symmetric. Hereinafter, one joint frame 20 side will be described, and the other joint frame 20' side will be numbered with a dash ('). The description is omitted.

In the joint frame 20, an outer main girder 22 fixed to one end face of the culvert and an inner peripheral flexible water blocking member 40 are mounted on the inner surface of a plate-like skin plate 21 constituting the outer surface. Main girder 23 and sub-girder 2 to which outer peripheral side flexible water blocking member 30 is fixed
4 are welded and fixed at predetermined intervals in the axial direction (left-right direction in FIG. 1) of the culvert 1 in order from the outer end side.
In addition, this joint frame 20 is a segment 10 constituting a culvert.
In the same manner as described above, it is divided into a plurality in the circumferential direction, and is connected in the circumferential direction to form an annular shape having a predetermined diameter corresponding to the culvert 1.

Outer end of skin plate 21 (underdrain 1 side)
The edge of the outer main girder 22 coincides with the outer main girder 22, and the edge on the other end side (joint center side) protrudes from the sub girder 24 toward the joint center. When the joint 2 is set to be installed, the distance between the end face of the joint frame 20 'and the end face of the skin plate 21' of the joint frame 20 'is set such that the axial displacement of the culvert 1, 1' allowed by the joint 2 is determined. The interval is set according to the amount.

The outer main girder 22 and the inner main girder 23 have the same shape.
The longitudinal ribs 25 are fixedly provided between the two by welding at predetermined intervals in the circumferential direction. The sub-girder 24 has a large inner diameter and a short height in the radial direction, and sub-ribs 26 are fixedly arranged at predetermined intervals in the circumferential direction between the sub-girder 24 and the inner main girder 23. The sub-spar 24 and the sub-ribs 26 constitute an outer peripheral side support member support frame in this embodiment.

The lower edge of the sub rib 26 coincides with the lower edge of the sub girder 24. At the substantially center in the width direction, as shown in a partially enlarged perspective view of the relevant portion in FIG. Member 5
A nut 26A for fixing the fixing rib 2
6 is welded and fixed so as to coincide with the inner peripheral edge.

An outer flexible water-stopping member 30 is fixed to the joint center side of the sub-girder 24, and an outer peripheral receiving member 50 is fixed to the inner peripheral side of the sub-girder 24 and the sub-rib 26.

The outer flexible water blocking member 30 has a plate shape having a predetermined hardness and a predetermined thickness, has a fixed flange portion 31 on the inner circumferential side at both ends in the width direction, and has a central inner circumferential portion. The flexible portion 32 is bent so as to be loosened to the side, and is continuous in a ring shape corresponding to the diameter of the culvert 1 in the circumferential direction. Then, the fixed flange portions 31 at both ends are connected to the inner main beams 2 of the sub beams 24, 24 'of the joint frames 20, 20', respectively.
The nuts 82, 82 'screwed into the bolts 81, 81' inserted from the 3, 23 'side through protection fixing members 70, 70' having an L-shaped cross section from the inside are pressed against the sub-girder 24, 24 '. The outer side flexible water blocking member 30 connects the left and right joint frames 20, 20 '.

As shown in FIG. 4, the outer peripheral side receiving member 50 is a plate having a predetermined thickness as viewed from the joint axial direction. By fixing to 20, it is formed in a cylindrical shape as a whole. The outer peripheral side receiving member 50 has its upper surface abutted against the lower edges of the sub-girder 24 and the sub-rib 26, and the end surface on the joint frame 20 side abuts on the inner main girder 23. Tightening bolt 8 screwed to nut 26A provided on 26
3 is fixed to the auxiliary rib 26 (that is, the joint frame 20). Like the skin plate 21, the end face on the center side of the joint has a gap with the end face of the outer peripheral side receiving member 50 of the other joint frame 20 'opposed to the culvert 1 when the joint 2 is set. , 1 'are set so as to have an interval corresponding to the axial displacement amount. A counterbore 50A is provided on the inner peripheral surface side of the outer peripheral side receiving member 50 at the portion to be fastened by the tightening bolt 83. The bolt head of the tightening bolt 83 is accommodated in the counterbore 50A and the outer peripheral side receiving member. The projection 50 does not project to the lower surface side.

On the inner peripheral side of the outer-side receiving member 50, an inner-peripheral flexible water-stopping member 40 constituting the flexible water-stopping member of the present invention is fixedly mounted on the inner main girder 23 of the joint frame 20. Have been.

The inner peripheral side flexible water blocking member 40 is a plate having a predetermined thickness made of rubber or synthetic resin such as chloroprene rubber having a predetermined hardness, and is reinforced by an inserted vinylon cloth (not shown), and has a width. It is formed on a substantially flat surface in the direction, and has a mounting flange portion 41 on the inner peripheral side of both edges in the width direction. The inner-peripheral flexible water-stopping member 40 also has a ring shape continuous in the circumferential direction similarly to the outer-peripheral-side flexible water-stopper 30, and the mounting flange portions 41 at both end edges thereof are attached to the inner main girder of the joint frame 20. 2
3 is pressed by a nut 85 screwed from the center of the joint into a bolt 84 inserted from the outer main girder 22 side through a frame plate 62 as a fixing flange of an inner peripheral receiving member 60 which will be described later. , Whereby the inner peripheral side flexible water blocking member 40 connects the two joint frames 20, 20 '.

As shown in the perspective view of FIG. 5A and FIG. 5B as viewed from the left in FIG. 1, the inner peripheral side receiving member 60 has a plurality of unit members divided in the circumferential direction. 60A, each unit member includes a holding plate 61 extending in the joint axial direction along the inner peripheral surface of the inner peripheral side flexible water blocking member 40, and a holding plate 6
A pair of frame plates 62 and 63 fixed to the holding plate 61 so as to extend from both ends in the joint axial direction to the inner peripheral side;
1 so as to extend from both ends in the circumferential direction to the inner circumferential side.
Between the pair of joint plates 64 fixed to the frame plate 62 and the pair of joint plates 64 so as to extend from the inner peripheral surface of the holding plate 61 to the inner peripheral side and in parallel with the joint plates 64. And one or more (two in this embodiment) rib plates 65 fixed to the inner peripheral surface of the holding plate 61. The inner peripheral edge of the frame plate 63 closer to the center of the middle joint of the pair of frame plates is
The radial length of the frame plate 63 is determined so as to coincide with the inner peripheral edge of the frame 3. The frame plate 62 closer to 23 has a radial length slightly smaller than the radial length of the frame plate 63 so that the inner peripheral side flexible water blocking member 40 is easily attached.

The lengths of the frame plates 62 and 63, the joint plate 64 and the rib plate 65 in the joint radial direction are formed so as to be smaller than the joint axial length L of the holding plate 61 (FIG. 5A). Have been. With this configuration, the girder height of the inner peripheral side receiving member 60 can be suppressed to a half or less of the width of the inner peripheral side flexible water blocking member 40, whereby the girder height of the entire joint can be reduced. If there is a possibility that the strength may be insufficient by reducing the girder height of the inner peripheral side receiving member 60, it can be compensated by increasing the thickness and / or the number of the rib plates 65 provided.

Each unit member 60A of the inner peripheral side receiving member 60 is adjacent to each other by a bolt (not shown) inserted into a bolt hole 64 formed in the joint plate 64 and a nut (not shown) screwed to the bolt. The annular inner peripheral receiving member 60 is connected to the unit member 60 </ b> A as a whole, and is configured as a whole.

The inner peripheral side flexible water blocking member 40 is fixed to the frame plate 62 closer to the main girder 22 by a nut 85 screwed to the bolt 84.
Is pressed and fixed to the inner main girder 23, and at the same time, the frame plate 62 (that is, the inner peripheral side receiving member 60) is also fixed to the inner main girder 23.

The presser plate 61 is located adjacent to the inner peripheral side of the inner peripheral flexible water blocking member 40, and its end face on the center side of the joint is fixed to the other joint frame 20 'facing the inner peripheral side. Member 6
The distance between the 0 'and the end face of the holding plate 61' is set so as to correspond to the axial displacement of the culverts 1 and 1 'that is allowed when the joint 2 is set. The opposing distance between the side surface of the inner peripheral side receiving member 60 on the joint center side of the frame plate 63 and the inner peripheral side receiving member 60 ′ of the frame plate 63 ′ is opposed to the pressing plate 61 and the pressing plate 61 ′. Are set wider by a predetermined amount than the facing distance between the end faces.

The joint 2 constructed as described above is fixed to the end faces of the culverts 1 and 1 'to which the outer main girders 22 and 22' of the joint frames 20 and 20 'at both ends are connected by bolts 86 and 86', respectively. The culverts 1 and 1 'are interposed between the facing end surfaces of the culverts 1 and 1', thereby connecting the culverts 1 and 1 '. In the opposing gaps between the inner frame plates 63, 63 'of the left and right inner peripheral side receiving members 60, 60', a plate-like foamed rubber 87 is inserted and adhered and fixed.
The end face of the foam rubber 87 on the inner peripheral surface side of the culvert reaches the inner peripheral surface of the concrete layer 3 of the secondary lining and is exposed on the inner peripheral side. A cover plate 88 is mounted on the outer surface of the skin plate 21 so as to cover the facing gap between the left and right skin plates 21 so as to straddle between the left and right joint frames 20, 20 '. This cover plate 88 is not robust,
Further, the bonding strength to the skin plate 21 is weak enough not to fall off.

Here, when the joint frames 20, 20 'are mounted on the end faces of the culverts 1, 1' or when the thrust of the shield propulsion acts on the joint 2, the joint frame 20 or 20 'as shown in FIG. A bolt in which a thrust receiving member 90 is screwed to a nut 24A fixed to the sub-girder 24 instead of the outer-side receiving member 50 on the inner peripheral surface of the sub-girder 24 and the sub-rib 26 on which the outer peripheral-side receiving member 50 is mounted. 91, the thrust receiving member 9
A value of 0 causes the left and right joint frames 20, 20 'to be in a firmly connected state. That is, the mounting portion of the outer peripheral side receiving member 50 also serves as the mounting portion of the thrust receiving member 90. FIG. 6 shows a state when the thrust of the shield propulsion is received, and the joint frames 20, 20 'are shown.
Is attached to the end surfaces of the culverts 1 and 1 ', unlike the state shown in the figure, the inner peripheral side flexible water blocking member 40 is not attached. That is,
One joint frame 20 is connected to the corresponding culvert 1 in a state where the joint frames 20 and 20 ′ are connected by the thrust receiving member 90, and then the thrust receiving member 90 is once removed and the outer peripheral side flexible water stopping member 30 is removed. After being attached, the thrust receiving member 90 is attached again to be in the state shown in the figure.

In the joint installation setting state, the right and left joint frames 20, 20 'and the culverts 1, 1' are
8, outer peripheral side flexible water blocking member 30, inner peripheral side flexible water blocking member 40
And the foam rubber 87, so that the skin plates 21, 21 'and the outer peripheral side receiving members 50, 50' are connected.
And holding plates 61, 61 'of inner receiving members 60, 60'.
Have a predetermined interval as described above.

The concrete of the secondary lining is made of the joint frame 20,
The inside of the inner receiving member 60 'and the inner peripheral side receiving members 60, 60' are filled and constructed.

Next, the operation of the above joint will be described. In the joint 2 of the underdrain constructed as described above, the outer flexible water blocking member 30 and the inner flexible water blocking member 40 are provided in duplicate for external pressure, and the inner circumferential side is flexible for internal pressure. It is provided with a flexure prevention member 40. In other words, even if the earth pressure or the external water pressure acts on the outer peripheral side flexible water blocking member 30 from the opposed gap between the left and right skin plates 21 and 21 ′ and the flexible portion 31 swells inwardly, Is supported by the outer peripheral side receiving member 50 to prevent excessive deformation. Even if water leaks from the outer-peripheral flexible water-stopping member 30 and is flooded on the inner peripheral side, the inner-peripheral flexible water-stopping member 40 prevents water from entering the culvert. The inner peripheral side flexible water blocking member 40 is prevented from bulging to the inner peripheral side due to the external water pressure by the pressing plate 61 of the inner peripheral side receiving member 60 arranged adjacent to the inner peripheral side. On the other hand, the outer peripheral side receiving member 50 regulates the bulging of the inner peripheral side flexible water blocking member 40 to the outer peripheral side due to the internal water pressure from inside the culvert. This prevents the inner peripheral side flexible water blocking member 40 from being excessively deformed on any of the inner and outer sides.

In the event of an earthquake or ground deformation, the flexible section 32 of the outer flexible water blocking member 30 bends and expands, and the inner flexible water blocking member 40 expands and contracts. , 1 '. Cover plate 88
The joint frame 20, 20 'is not easily broken or deformed due to its low joint rigidity with the skin plate 21 and low strength of itself.

The displacement of the culverts 1 and 1 'in the approaching direction is caused by the opposing skin plates 21 and 21' and the outer peripheral side receiving member 5.
0, 50 'and the end faces of the holding plates 61, 61' are regulated by contact with each other, and the outer flexible water blocking member 30 is excessively bent or the frame plates 63, 60 of the inner receiving members 60, 60 '.
The foamed rubber 87 inserted in the opposing gap 63 'does not collapse and deteriorate due to excessive compression exceeding the elastic limit.

In each of the above embodiments, an example in which the present invention is applied to the connection of a concrete culvert is shown. However, the material of the culvert is not limited to this, and the present invention is applied to a culvert made of another material. You may. The sectional shape of the culvert is not limited to a circle, but may be any one of an ellipse, a square, and other polygons. Further, the culvert is not an assembly of divided members (segments) but an integral product. It is a good thing.

[0039]

As described above, according to the present invention, the girder height (dimension in the radial direction) of the inner peripheral side receiving member can be reduced, thereby reducing the girder height of the entire joint. it can. In addition, by providing one or a plurality of rib plates between the joint plates at both ends, insufficient strength that can be caused by reducing the girder height of the inner peripheral side receiving member is compensated by increasing the thickness and / or number of the rib plates. The strength of the inner peripheral side receiving member can be set to a desired value.

In use, expansion of the flexible water-stopping member toward the inner periphery due to external pressure is regulated by the inner peripheral-side receiving member. Since the outer peripheral side receiving member regulates, the flexible water blocking member can be sufficiently protected against internal and external pressures.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a joint which is one embodiment of a culvert joint according to the present invention.

FIG. 2 is a perspective view of a culvert connected by the joint of FIG. 1;

FIG. 3 is a partially enlarged perspective view showing a fixing portion of an outer peripheral side receiving member.

FIG. 4 is a view of an outer peripheral side receiving member viewed in a joint axial direction.

FIG. 5 is a perspective view showing a unit member of the inner peripheral side receiving member and a view seen from the left side in FIG. 1;

FIG. 6 is a cross-sectional view of the joint showing a state in which a thrust of shield propulsion is received.

FIG. 7 is a sectional view showing an example of a conventional joint.

FIG. 8 is a sectional view showing another example of a conventional joint.

[Explanation of symbols]

 Reference Signs List 1, 1 'culvert 2 joint 20, 20' joint frame (joint frame body) 24 sub-girder (receiving member supporting frame) 26 auxiliary rib (receiving member supporting frame) 30 outer peripheral flexible water blocking member 40 inner peripheral flexible Water stopping member 41, 41 'Mounting flange portion 50, 50' Outer side receiving member 60, 60 'Inner side receiving member 61, 61' Holding plate 62, 62 '63, 63' Frame plate 64 Joint plate 65, 65 ' Rib plate

Claims (1)

[Claims] 1. A joint frame fixed to an opposed end face of a culvert to be connected and continuous in the circumferential direction of the culvert, respectively, and provided on opposite end faces of the two joint frame bodies in a circumferential direction of the culvert, respectively. An outer-side receiving member supporting frame, an outer-side receiving member fixed to the outer-side receiving member supporting frame so as to be continuous in the circumferential direction of the culvert on the inner peripheral side of the outer-side receiving member supporting frame, and the two joints A flexible water-stopping member made of rubber, synthetic resin, or the like provided continuously in the circumferential direction of the underdrain so as to connect the opposed end surfaces on the inner peripheral side from the outer peripheral receiving member of the frame body in a watertight manner; An inner peripheral side receiving member provided continuously in the circumferential direction of the culvert at a position adjacent to the inner peripheral side of the flexible water blocking member at a predetermined interval between the opposing end surfaces of the two joint frame members. The inner peripheral side receiving member includes a plurality of unit members divided in a circumferential direction. The position member is a holding plate extending in the joint axial direction along the inner peripheral surface of the flexible water blocking member, and a pair of frame plates extending from both ends of the holding plate in the joint axial direction to the inner peripheral side, A pair of joint plates extending from both ends in the circumferential direction of the holding plate to the inner peripheral side, and a pair of joint plates extending from the inner peripheral surface of the holding plate to the inner peripheral side are disposed between the pair of joint plates. A culvert joint comprising one or more rib plates.