Culvert joints

Abstract

To provide a culvert joint that can cope with external pressure and internal pressure without arranging a flexible water stop member in duplicate.SOLUTION: A culvert joint 100 is a culvert joint 100 in which a flexible water stop member 20 that is flexible and has a bulging portion 21 in a middle portion and anchoring portions 22 at both ends is constructed in a continuous watertight manner in the circumferential direction between joint frames (fixing members) 10 that are continuous in the circumferential direction of a connected culvert 1 and fixed to opposing end surfaces 2, and allows relative displacement of the culvert 1 by deformation of the flexible water stop member 20, and comprises an annular support member 30 arranged in a space A on an outer peripheral side of the bulging portion 21 and continuous in the circumferential direction, pressure receiving members 40 that are rotatable around a cross section of the annular support member 30 and mounted at intervals in the circumferential direction to support deformation of the flexible water stop member 20 due to internal pressure, and a spacing member that regulates the movement range of the pressure receiving member 40 in the circumferential direction with respect to the annular support member 30.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a culvert joint. [Background technology]

[0002] In underground conduits such as water supply and sewerage systems, water conduits, and discharge conduits, joints are installed at the joints of each unit length to allow relative displacement while maintaining watertightness. For example, in the case of a culvert joint constructed by the shield method disclosed in Patent Document 1, as shown in FIG. 12, flexible water-stopping members 20 made of short cylindrical rubber, synthetic resin, or the like and having flexibility are arranged on both the outer and inner sides between the opposing end faces 2 that are continuous in the circumferential direction of the culvert 1 to be connected, thereby making it possible to respond to external and internal pressures acting on the culvert 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-184491 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the flexible water-stopping members 20 are arranged in two layers, the height in the radial direction Y required for installation increases, making it difficult to apply to an underdrain 1 with a limited height. Furthermore, arranging the flexible water-stopping members 20 in two layers necessitates an increase in the outer diameter of the underdrain 1, or there is a problem that the effective inner space becomes smaller.

[0005] The present invention has been made in view of the problems of the prior art, and has as its object to provide a culvert joint that can withstand external and internal pressure without the need for a double flexible water-stopping member. [Means for solving the problem]

[0006] The underdrain joint according to the present invention for solving the above problems is as follows: A culvert joint in which a flexible water-stopping member having a bulge in the middle and anchoring portions at both ends is installed watertightly between fixing members fixed to the circumferentially continuous and opposing end faces of the culvert to be connected, and which allows relative displacement of the culvert by deformation of the flexible water-stopping member, an annular support member that is disposed in a space on the outer circumferential side of the bulging portion and is continuous in a circumferential direction; pressure-receiving members that are rotatable around the cross section of the annular support member and are attached at intervals in the circumferential direction to support deformation of the flexible water-stopping member due to internal pressure; a spacing member that restricts the circumferential movement range of the pressure-receiving member relative to the annular support member, thereby allowing deformation of the flexible water-stopping member due to internal pressure; It is characterized by:

[0007] The annular support member is preferably formed into an annular shape by dividing it into a plurality of pieces of either a rod or a cable having a circular cross section and connecting them with connecting members.

[0008] It is preferable that the pressure-receiving member has a width that does not interfere with the culvert when the flexible water-stopping member is deformed, and a length that is spaced circumferentially at intervals of not more than twice the thickness of the flexible water-stopping member. [Effects of the Invention]

[0009] The underdrain joint of the present invention can withstand external and internal pressure without the need for a double flexible water-stopping member. [Brief explanation of the drawings]

[0010] [Figure 1] 3 is a cross-sectional view taken along line AA in FIG. 2, showing one embodiment of the underdrain joint of the present invention. [Figure 2] 1 is a schematic perspective view of an underdrain to which an embodiment of the present invention is applied. [Figure 3] FIG. 2 is a front view of the annular support member according to the embodiment of the present invention. [Figure 4]1A is an enlarged longitudinal sectional view of a portion of a sleeve according to an embodiment of the present invention, and FIG. 1B is an enlarged front view of a portion of the sleeve. [Figure 5] 1A and 1B are a front view and a side view, respectively, of a pressure-receiving member according to an embodiment of the present invention. [Figure 6] FIG. 2 is a longitudinal cross-sectional view of a spacing member according to an embodiment of the present invention. [Figure 7] FIG. 10 is a front view of an annular support member according to another embodiment of the present invention. [Figure 8] 10A and 10B show another embodiment of the present invention, in which (a) is an enlarged longitudinal sectional view of a portion, and (b) is an enlarged longitudinal sectional view of a connecting portion. [Figure 9] FIG. 1 is a cross-sectional view of an embodiment of the present invention in an extended state. [Figure 10] FIG. 2 is a cross-sectional view of a contracted state according to an embodiment of the present invention. [Figure 11] FIG. 1 is a cross-sectional view of a sheared state according to an embodiment of the present invention. [Figure 12] FIG. 1 is a cross-sectional view of a conventional culvert joint. [Figure 13] 10A is an explanatory diagram of a reference example without a pressure-receiving member in a normal state, and FIG. 10B is a cross-sectional view of a biased state. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the underdrain joint of the present invention will be described in detail with reference to the drawings. As shown in Figures 1 to 11, the culvert joint 100 is constructed by installing flexible water-tight members 20, which are flexible and have a bulge 21 in the middle and anchoring portions 22 at both ends, continuously in the circumferential direction between fixing members 10 fixed to the circumferentially continuous and opposing end faces 2 of the culvert 1 to be connected, and allowing relative displacement of the culvert 1 by deformation of the flexible water-stopping members 20, and is constructed by including an annular support member 30 which is arranged in space A on the outer periphery of the bulge 21 and is continuous in the circumferential direction, pressure-receiving members 40 which are rotatable around the cross section of the annular support member 30 and are attached at intervals in the circumferential direction and support deformation of the flexible water-stopping members 20 due to internal pressure, and spacing members 50 which restrict the range of circumferential movement of the pressure-receiving members 40 relative to the annular support member 30. This culvert joint 100 can withstand external and internal pressure without the need to place two flexible water-stopping members 20 (see FIG. 12). The culvert 1 to be connected is not limited to a tunnel, but may be a culvert constructed underground such as a water supply / sewerage system, a water conduit, or a discharge conduit, and the use of the culvert 1 is not limited in any way.

[0012] In the following description, an example will be given in which flexible segments are provided as the culvert joints 100 in a tunnel constructed by a shield method as the culvert 1. As shown in Figure 2, the culvert 1 is a culvert with a circular cross section constructed by the shield tunneling method, and is constructed by assembling steel segments, concrete segments, ductile segments, etc. into a cylindrical shape to line the inner surface of the tunnel, and then pouring concrete around the inner periphery as a secondary lining to form a concrete layer (not shown). The culvert joint 100 made up of flexible segments constitutes the primary lining of a tunnel constructed using the shield method. The flexible segments are connected in an annular shape, and joint frames (fixing members) 10 at both ends in the axial direction X are connected to the end faces 2 of the culvert 1 made up of normal shield segments, forming a flexible tunnel.

[0013] The culvert joint 100 is constructed by connecting joint frames 10, which serve as a pair of symmetrical fixing members fixed to the end faces 2 of each of the culverts 1 to be joined, in a watertight manner with flexible water-stopping members 20 made of rubber, synthetic resin, or the like, and by fixing both joint frames 10 to the opposing end faces 2 of the culverts 1, the culvert joint 100 joins the culverts 1 together. The shapes of the left and right joint frames 10 and their attachment structures to the culvert 1 are symmetrical, and the following describes one of the joint frames 10. The joint frame 10 is divided into multiple pieces (circumferentially divided pieces) in the circumferential direction, just like the shield segments, and by connecting multiple pieces together, it is formed into a circular ring shape with a predetermined diameter corresponding to the culvert 1.

[0014] The joint frame 10 is constructed by welding main girders 12 as connecting girder members and sub-girders 13 as supporting girder members to the inner surface of a skin plate 11, which is a plate-shaped outer plate with a predetermined width (length in the axial direction X of the tunnel) bent with a curvature equal to the outer surface of the culvert 1. Vertical ribs 14 as vertical rib members are arranged between the main girders 12 and sub-girders 13 in the axial direction X of the culvert 1, and circumferential joint plates 15 are provided at the circumferential ends (ends of the circumferential divided pieces), forming a frame-like structure. The main girders 12 are connected and fixed to the culvert 1 by being fastened to the end faces 2 of the segments that make up the culvert 1 with inter-ring bolts (not shown).

[0015] The main girder 12 is welded and fixed to the outer end of the skin plate 11 (the end on the culvert 1 side) with the plate surface oriented perpendicular to the axial direction X of the culvert 1, and its height (width in the radial direction Y) is equal to the segments that make up the culvert 1.

[0016] The sub-girders 13 are welded to the inner ends of the skin plates 11, with their plate surfaces perpendicular to the axial direction X of the culvert 1. If thrust bearing members are installed between the sub-girders 13 during excavation, their height is set to, for example, 50 to 70% or less of the height of the main girders 12 to ensure the thickness of the thrust bearing members during excavation. Normally, the height of the main girders 12, rather than the sub-girders 13, is increased to accommodate the thrust bearing members. The anchoring portions 22 on the side edges of the flexible water-stopping members 20 are fixed to the sub-girders 13 so as to be sandwiched between them via clamping brackets 24 tightened by mounting bolts and nuts 23. If necessary, protective members 28, such as rubber, are attached to the nut side of the mounting bolts and nuts 23 to prevent direct contact with the flexible water-stopping members 20.

[0017] The vertical ribs 14 are block-shaped with a predetermined thickness and sufficient rigidity to transmit thrust. They are fixed between the main girders 12 and the sub-girders 13, perpendicular to them (with the plate surfaces in the axial direction X of the culvert 1), and are arranged at predetermined intervals around the circumference. Their outer end faces (the upper end faces in the figure) do not abut the inner circumferential surface of the skin plate 11, leaving a gap between them. Their inner end faces (the lower end faces in the figure) are set a predetermined distance higher (recessed) than the inner circumferential end faces of the main girders 12, and a female thread is formed on the end faces perpendicular to the end faces. An inner cover rubber 18, with a flat surface on the inner circumferential side of the culvert 1, is attached to the female threads of the vertical ribs 14 with fixing bolts 17, so as to seal the gap between the opposing culverts 1 and to accommodate the expansion and contraction deformation of the flexible water-stopping members 20.

[0018] The circumferential joint plate 15 is fixed perpendicular to the skin plate 11, main girder 12 and sub girder 13 so as to fill the gap between them, and its inner end face is aligned with the inner end face of the main girder 12. The circumferential split pieces of the joint frame 10 are joined together by fastening the circumferential joint plate 15 with joint bolts 16 (see Figure 1).

[0019] The distance between the main girder 12 and the secondary girder 13 (the width in the axial direction X of the joint frame body 10) is set to the minimum distance that allows for the placement of joint bolts 16 that connect the peripheral split pieces, and also allows for the insertion of mounting bolts and nuts 23 that fasten the flexible water-stopping member 20 to the secondary girder 13.

[0020] The pair of joint frames 10 are connected and fixed by fastening the main girders 12 to the segments that make up the culvert 1 with inter-ring bolts (not shown). An outer cover plate 19 is arranged on the outer peripheral surface of the skin plate 11 of the joint frame 10 so as to straddle the two and close the gap between the culvert 1, and is attached so as to be able to follow the expansion and contraction deformation of the flexible water-stopping member 20.

[0021] As shown in Figure 1, the flexible water-stopping member 20 is positioned so that its middle bulge 21 protrudes toward the center of the culvert 1, and the anchoring portions 22 on both side edges are bent from the outer periphery toward the center, and is watertightly attached with clamping fittings 24 fastened to both sub-girders 13 with mounting bolts and nuts 23. The flexible water-stopping member 20 is a plate-shaped member of a specified thickness and width made of chloroprene rubber of a specified hardness, with a bulge 21 formed in the center of the width direction to allow deformation, and anchoring portions 22 formed on both side ends by bending perpendicularly toward the center. The flexible waterproofing member 20 may be reinforced by inserting reinforcing fibers or the like inside the rubber.

[0022] The bulging portion 21 is formed in a roughly V-shape that bulges toward the center by a predetermined width, and can be expanded and deformed in the width direction by unfolding it (see FIG. 9), and can also accommodate contraction deformation by deforming it in an overlapping manner (see FIG. 10). Note that the bulging portion 21 is not limited to being roughly V-shaped, and may be shaped like an inverted Ω, or the like, as long as it can withstand deformation such as expansion and contraction, and may have multiple V-shaped or Ω-shaped portions connected in succession.

[0023] The clamping member 24 is made of metal such as steel. As shown in FIG. 1 , the clamping member 24 is formed in a roughly Z-shape and includes an arc-shaped clamping portion 25 on the outer periphery, a vertical clamping plate portion 26 in the middle along the radial direction Y, and an abutting portion 27 on the inner periphery that abuts against the sub-girder 13. The clamping plate portion 26 has a bolt hole through which the mounting bolt / nut 23 is inserted. The abutting portion 27 is formed to protrude toward the sub-girder 13 in the opposite direction to the clamping portion 25, with the protruding amount taking into account the tightening margin of the anchoring portion 22. The flexible water-stopping member 20 has a pressure portion 25 attached to the inner periphery between the anchoring portions 22 on both sides of the bulge portion 21, a pressure plate portion 26 attached to the opposing inner side of the anchoring portions 22, and a contact portion 27 attached to the secondary beam 13.The flexible water-stopping member 20 is then fixed by tightening the mounting bolts and nuts 23 inserted into the pressure plate portion 26 so that it is sandwiched between the secondary beam 13 and the pressure plate portion 26. The anchoring portion 22 is not limited to being attached by clamping it with a clamping bracket 25 without forming a bolt hole for the mounting bolt and nut 23, but may also be attached by forming a bolt hole and directly tightening it with a clamping bracket 24.

[0024] In such a culvert joint 100, when external pressure such as soil pressure or water pressure is applied to the flexible water-stopping member 20 from the outer periphery of the culvert 1, the bulging portion 21 deforms to expand, thereby maintaining a watertight state and allowing deformation, and almost no force acts on the anchoring portion 22 in the pull-out direction (outward in the radial direction Y). On the other hand, when subjected to internal pressure, as shown in Figure 13, the deformation of the bulging portion 21 is not necessarily uniform, with the amount of deformation differing on the left and right sides of the bulging portion 21, causing it to deform at an angle, and there is a risk that a large pulling force will act on the anchor portion 22 that has deformed more.The pressure resistance to internal pressure is lower than that to external pressure, making it difficult to use in a state where internal pressure is acting as it is.In the illustrated reference example, the annular support member 30 is shown arranged in space A.

[0025] In order to improve the pressure resistance to internal pressure, the culvert joint 100 is provided with an annular support member 30 that is arranged in space A on the outer periphery of the bulging portion 21 and is continuous in the circumferential direction, as shown in FIG. 1, pressure-receiving members 40 that are rotatable around the cross section of the annular support member 30 and are attached at intervals in the circumferential direction to support deformation of the flexible water-stopping member 20 due to internal pressure, and spacing members 50 that restrict the range of circumferential movement of the pressure-receiving member 40 relative to the annular support member 30, as shown in FIGS. 3 to 6.

[0026] As shown in FIGS. 3 and 7 , the annular support member 30 is formed by joining and connecting rods and wire ropes made of metals such as steel or synthetic resins such as engineering plastics using welding, sleeves, etc., to form a ring shape. The annular support member 30 restricts deformation due to internal pressure of the flexible water-stopping member 20 of the culvert joint 100 and is disposed in the space A on the outer periphery of the bulging portion 21, as shown in FIG. 1 . The annular support member 30 is located approximately in the center of the outer periphery of the bulging portion 21 in the space A, and in a normal state, the upper end of the annular support member 30 is in contact with the bulging portion 21 due to its own weight. As shown in FIG. 3 , the annular support member 30 is formed by dividing a round bar into multiple pieces, for example, two semicircular pieces, and then welding the two divided pieces 31 together. Alternatively, a sleeve 33 is attached to an internal thread 32 formed in the divided piece 31, and the two pieces are connected as shown in FIG. 4 . The sleeve 33 is made of a cylindrical pipe, and the ends of the divided sections 31 of the annular support member 30 are inserted into the sleeve 33 from both ends. The annular support member 30 has two female threads 32 formed on each of the divided sections 31 from the outer periphery side. The sleeve 33 has four female threads 34 formed on the side wall corresponding to the female threads 32 of the annular support member 30, and four hexagonal socket set screws 35 are threaded into the female threads 32 through the female threads 34 of the sleeve 33 to connect and fix them. The annular support member 30 can also be made up of a cable such as a wire rope, and is connected by inserting a single steel wire rope 36 into a connecting sleeve 37 in the same way as a normal wire rope, as shown in Figures 7 and 8, and tightening it from the side wall with a hexagon socket set screw 35. Note that the annular support member 30 is not limited to the sleeve 33 or connecting sleeve 37 as long as it can be installed in an annular shape, and can be connected with other members without being limited to the sleeve 33 or connecting sleeve 37.

[0027] As shown in Figures 3 to 6, the pressure-receiving members 40 are attached rotatably around the cross section of the annular support member 30 at intervals in the circumferential direction, and support deformation of the flexible water-stopping member 20 due to internal pressure. The pressure-receiving member 40 has a rectangular pressure-receiving plate 41, and by bringing the pressure-receiving plate 41 into contact with the outer periphery of the flexible water-stopping member 20, which deforms due to internal pressure, a larger contact area is achieved to support deformation than the annular support member 30. A mounting ring 42 is attached to the center of the inner surface of the pressure-receiving member 40, and the annular support member 30 is inserted into the mounting ring 42, so that the pressure-receiving member 40 is attached rotatably around the cross section of the annular support member 30. As a result, even if the deformation amounts of the bulging portion 21 differ on the left and right, the deformation can be averaged and pressed down by the rotation of the pressure-receiving plate 41. As shown in Figure 1, the pressure-receiving member 40 has a width (width in the axial direction X of the culvert 1) that does not interfere with the sub-girders 13 located on both sides of the space A of the culvert 1, and is designed not to interfere with the culvert 1 even in the case of shrinkage deformation in which the two sub-girders 13 approach each other or shear deformation in which they shift up and down (see Figure 6, etc.).

[0028] The pressure-receiving members 40 are inserted into the annular support member 30, and are spaced apart circumferentially to prevent contact between the pressure-receiving plates 41. To maintain the spacing between the pressure-receiving members 40, the annular support member 30 has female threads formed on the outer periphery of its side wall. By threading hexagonal socket head bolts 51 into the threads, the pressure-receiving plates 41 contact the bolt heads, restricting movement and maintaining the spacing between the pressure-receiving plates 41. When attaching the pressure-receiving members 40 to the annular support member 30, the pressure-receiving plates 41 and the hexagonal socket head bolts 51 are attached alternately to maintain the circumferential spacing. The spacing between the pressure-receiving members 40 is set so that, even when the spacing is greatest, it is no greater than twice the thickness of the flexible water-stopping member 20. This prevents the deformed bulges 21 from protruding from between the pressure-receiving members 40, maintaining water-stopping properties and pressure resistance (see Figure 6, etc.). Note that the spacing retaining member 50 is not limited to the case where a female thread portion and a hexagon socket head bolt 51 are used, and when the annular support member 30 is made of a cord such as a wire rope, it is not possible to form a female thread portion, so it is sufficient to use a cylindrical sleeve 52 of a length sufficient to maintain the spacing, and to attach the pressure-receiving members 40 and the sleeves 52 alternately to the annular support member 30 (see Figure 8, etc.). Note that the method for maintaining the circumferential spacing of the pressure-receiving members 40 is not limited to the spacing retaining member 50, and other methods may be used, and there are no particular limitations on the method as long as the spacing can be maintained.

[0029] In such an underdrain joint 100, the pressure-receiving member 40 and the spacing member 50 are attached to the annular support member 30 in advance when the joint frame 10 is assembled, and then they are connected in an annular shape and placed in the space A. Alternatively, when the joint frame 10 is assembled, the pressure-receiving member 40 and the spacing member 50 are assembled to the divided annular support member 30 and finally placed in an annular shape in the space A. As shown in Figure 9, in the normal state of this underdrain joint 100, the annular support member 30 is positioned on the outer periphery of the center of the flexible water-stopping member 20, and the pressure-receiving member 40 is positioned parallel to the axial direction X.

[0030] In the culvert joint 100, similar to a normal flexible water-stopping member, when external pressure such as soil pressure or water pressure from the outer periphery of the culvert 1 is applied to the flexible water-stopping member 20, the annular support member 30, pressure-receiving member 40 and spacing member 50 simply remain free in space A and do not perform any supporting function, and the bulging portion 21 of the flexible water-stopping member 20 deforms so as to expand due to the external pressure, so that the anchoring portion 22 is hardly subjected to any force in the pull-out direction (outward in the radial direction Y), and is able to maintain a watertight state and allow deformation.

[0031] On the other hand, when the flexible water-stopping member 20 is subjected to internal pressure such as water pressure from the inner periphery of the culvert 1, and elongation occurs in which the distance in the axial direction X between the sub-girders 13 increases at the culvert joint 100, the bulging portion 21 deforms to expand outward, and as shown in Figure 9, the pressure-receiving member 40 rotates around the cross section of the annular support member 30, positioning the annular support member 30 approximately in the center of the bulging portion 21 and allowing deformation by evenly suppressing deformation on both the left and right sides of the bulging portion 21. As a result, the culvert joint 100 can maintain a watertight state against internal pressure and allow deformation, and an even force acts on the anchoring portion 22, ensuring pressure resistance. Furthermore, when shrinkage occurs at the culvert joint 100, reducing the distance in the axial direction X between the sub-girders 13, the bulging portions 21 will deform so as to overlap as shown in Figure 10, and whether the flexible water-stopping member 20 is subjected to internal pressure such as water pressure from the inner periphery of the culvert 1 or external pressure, the annular support member 30, pressure-receiving member 40 and spacing member 50 (see Figure 8, etc.) will simply be positioned in a free state in space A and will not perform their supporting function, and the deformation of the bulging portions 21 alone will not apply much force to the anchoring portion 22 in the pull-out direction (outward in the radial direction Y), and only an even force will act on it, thereby ensuring pressure resistance. Furthermore, in the case where shear stress occurs in the flexible water-stopping member 20 of the underdrain joint 100 due to internal pressure such as water pressure from the inner periphery of the underdrain 1, causing the position of the sub-girders 13 at the underdrain joint 100 to shift in the axial direction X, the bulging portion 21 will deform so as to tilt left and right with respect to the axial direction X, as shown in Figure 11, but as the pressure-receiving member 40 rotates around the cross section of the annular support member 30, the pressure-receiving plate 41 is positioned approximately in the center of the bulging portion 21, suppressing deformation on both the left and right sides of the bulging portion 21. As a result, in the underdrain joint 100, even though the bulging portion 21 tilts left and right, the watertight state is maintained and deformation can be tolerated, and by applying an equal force to the anchoring portion 22, pressure resistance can be ensured.

[0032] As specifically explained above in conjunction with the embodiments, the culvert joint 100 is a culvert joint 100 in which flexible water-stopping members 20, which are flexible and have a bulge 21 in the middle and anchoring portions 22 at both ends, are circumferentially and watertightly installed between joint frames (fixing members) 10 which are fixed to the circumferentially continuous and opposing end faces 2 of the culvert 1 to be connected, and which allows relative displacement of the culvert 1 by deformation of the flexible water-stopping members 20, and is configured to include an annular support member 30 which is arranged in space A on the outer periphery of the bulge 21 and is continuous in the circumferential direction, pressure-receiving members 40 which are rotatable around the cross section of the annular support member 30 and are attached at intervals in the circumferential direction, and which support deformation of the flexible water-stopping members 20 due to internal pressure, and spacing members 50 which restrict the circumferential movement range of the pressure-receiving members 40 relative to the annular support member 30. According to this configuration, the culvert joint 100 does not need to arrange the flexible water-stopping member 20 in a double (two-row) configuration, but rather arranges a single row of flexible water-stopping member 20 that corresponds to external pressure, and an annular support member 30, pressure-receiving member 40, and spacing member 50 that suppress deformation due to internal pressure in the space A on the outer periphery of the bulge portion 21, thereby ensuring a watertight state in response to external and internal pressures and allowing deformation. Furthermore, the underdrain joint 100 requires only one flexible water-stopping member 20, and by arranging the annular support member 30, which suppresses deformation due to internal pressure, the pressure-receiving member 40, and the spacing member 50 in the space A on the outer periphery of the bulging portion 21, the installation space can be made much smaller and more compact than when two flexible water-stopping members are provided, and the effective space of the underdrain 1 can also be increased. Furthermore, the number of parts is small, the structure can be simplified, and construction can be completed in a short time.

[0033] In the culvert joint 100, the annular support member 30 is divided into a plurality of pieces, each of which is a rod or a cable having a circular cross section, and connected by connecting members such as sleeves 33 and connecting sleeves 37 to form an annular shape. With this configuration, the annular support member 30 divided by the connecting members, the sleeves 33 and the connecting sleeves 37, can be formed into an annular shape, and can be easily formed into an annular shape at a factory or construction site. Furthermore, by making the cross section of the annular support member 30 circular, the pressure-receiving member 40 can be easily rotated around the cross section, and the flexible water-stopping member 20 can be supported with uniform deformation.

[0034] In the culvert joint 100, the pressure-receiving member 40 has a width that does not interfere with the culvert 1 when the flexible water-stopping member 20 is deformed, and a length that provides a circumferential spacing of less than twice the thickness of the flexible water-stopping member 20. With this configuration, it is possible to prevent the width and length of the pressure-receiving member 40 from hindering the deformation of the flexible water-stopping member 20, and the pressure-receiving member 40 can reliably receive the pressure in relation to deformation, thereby making the deformation uniform.

[0035] In the above embodiment, the case where a joint frame is used as a fixing member is described as an example of application to flexible segments as joints in an underdrain, but it is also possible to configure the structure so that plate-shaped fixing members are fixed directly to the opposing end faces of the underdrain without using a frame-shaped joint frame. Furthermore, the culvert is not limited to a large diameter one like a tunnel, but may be a small diameter one, and can be widely applied to cases where external pressure acts primarily, but internal pressure acts for some reason. The present invention is not limited to the above-described embodiment, and modifications can be made without departing from the spirit of the invention. [Explanation of symbols]

[0036] 100 Culvert joint 1. Culvert 2 End face 10 Joint frame (fixing member) 11 Skin Plate 12 Main digit 13 subdigit 14 Vertical ribs 15 Circumferential joint plate 16 Joint bolt 17 Fixing bolt 18 Inner cover rubber 19 Outer cover plate 20 Flexible water-stopping member 21 Bulge 22 Anchoring section 23 Mounting bolts and nuts 24 Clamp 25 Presser foot 26 Presser plate 27 Contact part 28 Protective materials 30 Annular support member 31 Split part 32 Female thread 33 Sleeve 34 Female thread 35 hex socket set screw 36 Wire Rope 37 Connecting sleeve 40 Pressure-receiving member 41 Pressure plate 42 Mounting ring 50 Spacing member 51 Hexagon socket head bolt 52 Sleeve A Space X-axis direction Y radial direction

Claims

1. A culvert joint in which a flexible water-stopping member having a bulge in the middle and anchoring portions at both ends is installed watertightly between fixing members fixed to the circumferentially continuous and opposing end faces of the culvert to be connected, and which allows relative displacement of the culvert by deformation of the flexible water-stopping member, an annular support member that is disposed in a space on the outer circumferential side of the bulging portion and is continuous in a circumferential direction; pressure-receiving members that are rotatable around the cross section of the annular support member and are attached at intervals in the circumferential direction to support deformation of the flexible water-stopping member due to internal pressure; a spacing member that restricts the circumferential movement range of the pressure-receiving member relative to the annular support member, thereby allowing deformation of the flexible water-stopping member due to internal pressure; A culvert joint characterized by:

2. The annular support member is formed into a ring shape by dividing it into a plurality of pieces of either a rod material or a cable having a circular cross section and connecting them with connecting members.

2. The culvert joint according to claim 1 .

3. The pressure-receiving member has a width that does not interfere with the underdrain when the flexible water-stopping member is deformed, and a length that is spaced circumferentially at intervals of not more than twice the thickness of the flexible water-stopping member.

3. The culvert joint according to claim 2.

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