Waterway material

Abstract

The challenge is to provide a joint material for waterways that can maintain stable watertightness even when strong external forces are applied to concrete structures. [Solution] The joint material 1 that forms the joint of the waterway comprises a base portion 10, a pair of first lip portions 20a, 20b that protrude from the upper surface 10a of the base portion 10 at a predetermined angle and spread outwards from each other, forming a V shape when viewed from the side, and a pair of second lip portions 30a, 30b that form an inverted V shape when viewed from the side, having connecting portions 32 that connect to the first lip ends 21a, 21b of the first lip portions 20a, 20b and the second lip portions 30a, 30b, respectively, and the second lip ends 31a, 31b of each are connected to each other. The first lip portions 20a, 20b and the second lip portions 30a, 30b are made of elastically deformable elastic members, and the pair of second lip portions 30a, 30b each abut against a part of the concrete structure and are inserted between the end faces of the concrete structure.

Description

Technical Field

[0001] The present invention relates to a joint material for a water channel. More specifically, it relates to a joint material for a water channel that can maintain high water stoppage performance even in a situation where the joint width changes.

[0002] Conventionally, many water channels for guiding various waters such as agricultural water, tap water, and industrial water to supply destinations such as fields, or for draining water from supply destinations, have been installed.

[0003] These water channels often use, for example, a concrete structure made of concrete as a water channel member, and are generally constructed by connecting a plurality of concrete structures. Here, a joint portion for preventing water leakage is formed between the connected concrete structures.

[0004] For example, when constructing a water channel 100 using a concrete structure 101 having a substantially U-shaped cross section as shown in FIG. 7 as a water channel member, a liquid sealing agent such as silicone resin is poured between the end faces 102 of the concrete structures 101 facing each other, and the joint portion 103 is formed by curing this.

[0005] By arranging a plurality of concrete structures 101 in a row, forming and connecting the above joint portion 103 therebetween, a water channel 100 such as an agricultural water channel can be constructed over a long distance. Note that the concrete structure 101 etc. used as a water channel member are well-known, and those of various shapes and forms are used according to the use and the installation location.

[0006] On the other hand, instead of forming a joint portion with a sealing agent, a water stoppage structure has been proposed in which a water stoppage sealing material is attached to the end faces of a pair of concrete structures arranged to face each other and this is used as the joint portion (see, for example, Patent Document 1).

[0007] For example, a flexible rubber or plastic material can be used as a waterproofing sealant. Because this waterproofing sealant is flexible, it can provide sufficient waterproofing simply by being installed and fixed between the end faces 102 of the concrete structure 101.

[0008] As a result, the time required for the sealing process (filling process) and the hardening process after pouring, which are necessary when using conventional sealing agents, can be eliminated, and the construction period required for constructing the waterway 100 can be significantly shortened.

[0009] Furthermore, since the installation position of the water-stopping sealant mentioned above is substantially the same as the formation position of the joint portion 103 in Figure 7, which has already been explained, a detailed illustration is omitted here. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Patent No. 5253731 [Overview of the project] [Problems that the invention aims to solve]

[0011] However, the construction of waterways using the aforementioned sealing agents or the water-stopping sealant described in Patent Document 1 sometimes resulted in the following problems.

[0012] In other words, in the event of an earthquake or other seismic event, external forces may be applied to waterways constructed with concrete structures. This can cause the relative position of one concrete structure to shift, and the "joint width," which is the distance between the end faces of the concrete structures, may widen or narrow, causing a change.

[0013] While the sealants used to form joints are known to have a certain degree of flexibility, significant changes in the distance between the end faces of concrete structures could impair the watertightness of the joints. This could lead to water leakage from the joints between concrete structures, preventing them from functioning properly as waterways. In addition, during major earthquakes, numerous such joint damages could occur, resulting in delays in the restoration of waterways after the earthquake. Furthermore, waterways are generally installed outdoors and exposed to sunlight. As a result, the formed joints could deteriorate due to ultraviolet radiation, causing cracks and potentially impairing their watertightness over time.

[0014] Therefore, in view of the above circumstances, the present invention aims to provide a joint material for waterways that can maintain stable watertightness even when strong external forces are applied to a concrete structure, and that is less affected by ultraviolet rays. [Means for solving the problem]

[0015] The inventors of this invention have diligently conducted research to address the above-mentioned problems, and as a result have developed a joint material for waterways with excellent and distinctive features, thereby completing the present invention.

[0016] [1] A joint material for a waterway, which is inserted between the end faces of a pair of concrete structures arranged opposite each other to form a joint for a waterway, comprising: a base portion; a pair of first lip portions that protrude from the base surface of the base portion at a predetermined angle and spread apart from each other, forming a V shape when viewed from the side; and a pair of second lip portions that are connected to the first lip ends of the first lip portions, with connecting portions where the second lip ends of each of the first lip portions are connected, forming an inverted V shape when viewed from the side, wherein the first lip portions and the second lip portions are formed of an elastically deformable elastic member, and the pair of second lip portions each abut against a part of the concrete structure, and the joint material for a waterway is inserted between the end faces of the concrete structure.

[0017] [2] The connecting part is formed to be breakable when an external force is applied to the concrete structure, and is the joint material for the water channel according to [1] in which the pair of second lip parts are separated from each other.

[0018] [3] The concrete structure has a mounting hole part to which the joint material for the water channel is mounted, and the pair of mounting hole parts formed by the concrete structures facing each other are opposite to the inverted V shape formed by the pair of second lip parts, and at least a part of them forms an inverted V shape when viewed from the side, and is the joint material for the water channel according to [1].

[0019] [4] The second lip part has a lip adhesion surface adhered to at least a part of the mounting hole part, and is the joint material for the water channel according to [3].

[0020] [5] The base part, the pair of first lip parts, and the pair of second lip parts are integrally extruded along the longitudinal direction of the joint material for the water channel, and are the joint material for the water channel according to [1].

[0021] [6] The elastic member is a rubber elastic member mainly composed of ethylene-propylene-diene rubber, and is the joint material for the water channel according to [1].

Advantages of the Invention

[0022] The joint material for the water channel of the present invention can easily and efficiently form a joint part provided between concrete structures in a water channel such as an agricultural water channel constructed by connecting a plurality of concrete structures.

[0023] Furthermore, even when a strong external force is applied to the concrete structure and the joint width changes, high water tightness can be maintained and the function as a water channel can be exhibited. Also, deterioration due to the influence of ultraviolet rays is small, and high water tightness can be maintained.

Brief Description of the Drawings

[0024] [Figure 1]It is an explanatory view seen from the side showing the schematic configuration of the joint material for the water channel of the present embodiment. [Figure 2] It is a perspective view showing the schematic configuration of the joint material for the water channel. [Figure 3] It is an explanatory view showing an enlarged view of the vicinity of the connecting part of the joint material for the water channel. [Figure 4] It is an explanatory view schematically showing an example before the insertion of the concrete structure of the joint material for the water channel. [Figure 5] It is an explanatory view schematically showing an example after the insertion of the concrete structure of the joint material for the water channel. [Figure 6] It is an explanatory view showing an example of the deformation of the joint material for the water channel at the time of breakage of the connecting part. [Figure 7] It is an explanatory view schematically showing an example of a water channel having a joint part.

Mode for Carrying Out the Invention

[0025] Hereinafter, embodiments of the joint material for the water channel of the present invention will be described. Note that the joint member for the water channel of the present invention is not limited to the following embodiments, and changes, modifications, improvements, etc. can be made without departing from the gist of the present invention.

[0026] 1. Joint material for water channel The joint material 1 for the water channel of one embodiment of the present invention (hereinafter simply referred to as "joint material 1") is used for constructing a water channel 100 such as an agricultural water channel.

[0027] As already described, the water channel 100 is constructed by connecting a plurality of concrete structures 101. The end faces 102 of the mutually opposed concrete structures 101 are arranged to face each other, and by mounting and fixing the joint material 1 of the present embodiment between the end faces 102, a "joint part 103" is formed (see FIG. 7).

[0028] Thereby, it is possible to prevent the water flowing inside the water channel 100 from leaking outside the water channel 100. That is, a high water-stopping property can be maintained by the joint part 103 formed using the joint material 1 of the present embodiment.

[0029] The joint material 1 of this embodiment is composed of a base portion 10, a pair of first lip portions 20a, 20b, and a pair of second lip portions 30a, 30b, as mainly shown in Figure 1 or Figure 2.

[0030] Here, Figure 1 is a side view diagram showing the schematic configuration of the joint material 1 of this embodiment. Figure 2 is a perspective view diagram showing the schematic configuration of the joint material 1, and Figure 3 is an enlarged diagram showing the vicinity of the connecting portion 32 of the joint material 1.

[0031] Furthermore, Figure 4 is a schematic explanatory diagram showing an example of the joint material 1 before insertion of the concrete structure 101, and Figure 5 is a schematic explanatory diagram showing an example of the joint material 1 after insertion of the concrete structure 101. Figure 6 is an explanatory diagram showing an example of deformation of the joint material when the connecting portion 32 breaks. Figure 7 is a schematic explanatory diagram showing an example of a waterway 100 having a joint portion 103.

[0032] In this embodiment, the side view of the joint material 1 is based on the view shown in Figure 1. That is, the side view is defined as the view of the joint material 1 from the front of the paper in Figure 1. Furthermore, in the following description, unless otherwise specified, "upper side" and "lower side" refer to the upper and lower sides of the joint material 1 in the side view in Figure 1.

[0033] The joint material 1 of this embodiment is composed of a base portion 10, a pair of first lip portions 20a, 20b, and a pair of second lip portions 30a, 30b, and all of these components are formed from an elastic material.

[0034] Furthermore, all of these components are formed by integrally extruding the joint material 1 along its longitudinal direction (from the front of the paper to the depth of the paper in Figure 1, or diagonally across the paper in Figure 2). Figure 2 is intended to illustrate that the joint material 1 of this embodiment has a longitudinal shape, and the diagram of the central part of the joint material 1 is omitted.

[0035] Extrusion molding of resins and other materials involves applying heat or other means to preheat the raw material to a fluid state, then extruding it through a die (mold) under a predetermined pressure, and finally cooling it in the extruded shape. Since this extrusion molding technique is well known, a detailed explanation will be omitted here.

[0036] The joint material 1 is a longitudinal member whose shape, as shown in Figure 1 when viewed from the front of the paper, is formed continuously along the depth direction of the paper from the front of the paper, and its extrusion length can be set arbitrarily.

[0037] This allows the concrete structure 101 used as a waterway member to be cut to a predetermined length to match the three sides (end face sides 104a, 104b, 104c) of the end face 102.

[0038] As an example of the joint material 1 in this embodiment, a concrete structure 101 with a substantially U-shaped cross-section, having three end faces 104a, 104b, and 104c consisting of a pair of side faces and a base that connects the lower ends of the side faces, as shown in Figure 7, is used as a waterway member and is used when constructing a waterway 100 with an open top.

[0039] However, the configuration of concrete structures and waterways is not limited to this. For example, a concrete structure having a rectangular tubular shape and end faces on all four sides may be used as a waterway member and may be used as a joint when constructing a waterway with a closed interior.

[0040] In this embodiment, the joint material 1 can be formed from an elastic member that is elastically deformable by stress. The material of the elastic member is not particularly limited.

[0041] For example, rubber elastic members mainly composed of ethylene-propylene-diene rubber (EPDM), or other conventionally known elastic members or rubber-based materials can be used. In particular, since extrusion molding technology using EPDM as a raw material is well established, the use of EPDM is especially preferable. In particular, by using EPDM, a stable joint material 1 that is less affected by ultraviolet rays can be constructed. As a result, it is possible to maintain high watertightness with little deterioration over time even after long-term use.

[0042] The base portion 10 constituting the joint material 1 of this embodiment has an upper base portion surface 10a and a bottom base portion surface 10b opposite to the upper base portion surface 10a, as shown in Figure 1, and is constructed to be substantially flat. Here, the upper base portion surface 10a corresponds to the base surface in this invention.

[0043] Furthermore, a pair of first lip portions 20a and 20b are provided projecting from approximately the center of the upper surface 10a of the base portion along a projection direction at a predetermined angle relative to the upper surface 10a of the base portion, so as to expand outwards from each other.

[0044] The pair of first lip portions 20a and 20b have an elongated shape when viewed from the side, with their longer sides coinciding along the protruding direction and their shorter sides coinciding along a direction substantially perpendicular to the protruding direction. As a result, the pair of first lip portions 20a and 20b are configured to have a V-shape when viewed from the side (see Figure 1) on the upper surface 10a of the base portion.

[0045] On the other hand, the second lip portions 30a and 30b are connected to the first lip ends 21a and 21b located at the respective ends of the pair of first lip portions 20a and 20b. The second lip portions 30a and 30b, like the first lip portions 20a and 20b described above, have an elongated shape when viewed from the side.

[0046] Here, the second lip portions 30a and 30b are positioned such that their respective long side directions intersect with the protruding direction (long side direction) of the first lip portions 20a and 20b.

[0047] More specifically, the second lip portions 30a and 30b are connected to the first lip ends 21a and 21b of the first lip portions 20a and 20b, respectively, at a position slightly off-center from the center in the direction of the long side.

[0048] In other words, as shown in Figure 1, the part above the first lip ends 21a and 21b (the upper side of the paper in Figure 1) is slightly shorter, while the part below the first lip ends 21a and 21b (the lower side of the paper in Figure 1) is slightly longer.

[0049] Furthermore, the second lip portions 30a and 30b, which are located above the first lip portions 21a and 21b, are connected to each other, forming a connecting portion 32 (see Figures 1 and 3).

[0050] Therefore, the pair of second lip portions 30a and 30b are configured to form an inverted V shape when viewed from the side, with the connecting portion 32 as the center. In other words, the pair of second lip portions 30a and 30b have a roughly V-shape.

[0051] As already explained, the joint material 1 of this embodiment is formed of an elastically deformable elastic member. Therefore, for example, the pair of first lip portions 20a and 20b protruding from the upper surface 10a of the base portion 10 shown in Figure 1 can widen or narrow the distance between their respective first lip ends 21a and 21b.

[0052] In other words, the angle between the pair of V-shaped first lip portions 20a and 20b (first angle α, see Figure 1) can be changed by elastic deformation.

[0053] Similarly, the angle between the pair of inverted V-shaped second lip portions 30a and 30b (second angle β, see Figure 1) can be changed by elastic deformation. In addition, the intersection angle between the first lip portions 20a and 20b and the second lip portions 30a and 30b can be changed.

[0054] The connecting portion 32, formed by connecting the second lip ends 31a, 31b of a pair of second lip portions 30a, 30b, can break when an external force is applied. That is, in Figure 1, if a force is applied in the left-right direction of the paper that separates the second lip portions 30a, 30b from each other, the connecting portion 32 will break, and the width W2 of the second lip portions 30a, 30b can be expanded.

[0055] The joint material 1 of this embodiment is formed integrally using conventional extrusion molding technology, with each component, such as the base portion 10, being formed together. Therefore, by adjusting the shape of the die (mold) during extrusion molding, it is possible to adjust how much external force is required to break the connecting portion 32.

[0056] In this state, the joint material 1, which is not subjected to external stress and is not elastically deformed, exhibits a symmetrical shape in a side view, as shown in Figure 1 or Figure 4.

[0057] Furthermore, a pair of second lip portions 30a and 30b, which form an inverted V shape, are connected to a pair of first lip portions 20a and 20b, which form a V shape when viewed from the side, so as to fit over the first lip ends 21a and 21b of the first lip portions 20a and 20b.

[0058] In other words, the openings of the pair of first lip portions 20a and 20b facing the upper surface 10a of the base portion and the openings of the pair of second lip portions 30a and 30b facing the connecting portion 32 are arranged in a state where they face each other.

[0059] Furthermore, the angle between the pair of second lip portions 30a and 30b, which form an inverted V shape, is set to be wider than the angle between the pair of first lip portions 20a and 20b, which form a V shape (first angle α). In other words, the second lip portions 30a and 30b are connected to the first lip portions 20a and 20b while satisfying the relationship "first angle α < second angle β".

[0060] The end face 102 of the concrete structure 101 that constructs the waterway 100 can be provided with mounting holes 105 that match the shape of the joint material 1 in this embodiment. Here, the mounting holes 105 can be formed by a pair of end faces 102 of the concrete structure 101 that face each other and a backup material 106 sandwiched between the end faces 102 (see Figure 4).

[0061] In other words, as shown in Figure 4, the mounting hole 105 is formed to match the shape of the second lip portions 30a and 30b of the joint material 1 that are inserted between the end faces 102. The mounting hole 105 has lip contact edges 107a and 107b that can contact the outer lip surfaces 33a and 33b of the second lip portions 30a and 30b, and bent edges 110a and 110b that bend from one end of the lip contact edges 107a and 107b toward the concrete side edges 108a and 108b to form the joint material insertion hole 109.

[0062] The lip contact edges 107a and 107b are inclined at an angle approximately equal to the angle of inclination of the second lip portion 30a and 30b with respect to the upper surface 10a of the base portion, and have an inverted V shape inclined with respect to the concrete side edges 108a and 108b of the concrete structure 101 (see Figure 4). As a result, as described above, the lip outer surfaces 33a and 33b of the second lip portion 30a and 30b can come into contact with the lip contact edges 107a and 107b.

[0063] Furthermore, the outer lip surfaces 33a and 33b of the second lip portions 30a and 30b can be bonded to the lip contact edges 107a and 107b via an adhesive. Here, the outer lip surfaces 33a and 33b correspond to the lip bonding surfaces in this invention.

[0064] 2. Insertion of jointing material (formation of joint area) Next, the formation of the joint portion 103 in the waterway 100 using the joint material 1 of this embodiment will be described. First, as shown in Figure 4, the joint material 1 of this embodiment is inserted between the end faces 102 of a pair of concrete structures 101 that are facing each other and arranged with a predetermined distance (joint width) between them. As shown in Figure 4, a backup material 106 is interposed in part between the end faces 102.

[0065] At this time, the width W2 (see Figure 4) of the joint material 1 when no stress is applied is wider than the insertion width W1 of the joint material insertion hole 109 formed between the concrete sides 108a and 108b between the end faces 102 of the pair of concrete structures 101.

[0066] Therefore, it cannot be directly inserted into the mounting hole 105 formed between the end faces 102. To address this, stress is applied to the joint material 1, causing the first lip portions 20a, 20b and the second lip portions 30a, 30b to elastically deform. As a result, the joint material 1, deformed into a shape that can pass through the insertion width W1 of the joint material insertion hole 109, is inserted into the space of the mounting hole 105.

[0067] Upon reaching the mounting hole 105, the joint material 1, having been subjected to stress for passing through the joint material insertion hole 109, elastically returns to its original state. As a result, the joint material 1 is inserted into the mounting hole 105 between the end faces 102 with the outer lip surfaces 33a and 33b of the second lip portions 30a and 30b in contact with the lip contact edges 107a and 107b, and the mounting is completed (see Figure 5).

[0068] Here, adhesive is applied in advance to the lip contact edges 107a, 107b and the backup material 106 that come into contact with the lip outer surfaces 33a, 33b of the second lip portions 30a, 30b of the joint material 1, forming an adhesive layer 111. On the other hand, a primer is applied in advance to the lip outer surfaces 33a, 33b, forming a primer layer 112.

[0069] As a result, the adhesive layer 111 and the primer layer 112 bond the second lip portions 30a and 30b of the joint material 1 and the lip contact edges 107a and 107b of the concrete structure 101 together. In other words, the joint material 1 is fixed in place by the adhesive while inserted into the mounting hole portion 105.

[0070] The adhesive used is not particularly limited; for example, a well-known epoxy resin adhesive can be used. The primer can be appropriately selected and used depending on the adhesive used.

[0071] Figure 5 shows a case where the width W2 of the joint material 1 is approximately the same as the widths of the pair of lip contact edges 107a, 107b and the backup material 106, but it is not limited to this case.

[0072] For example, the width of the backup material 106 may be set to be even narrower. That is, the joint width can be narrowed. In this case, the joint material 1 inserted into and fixed in the mounting hole 105 maintains elastic deformation as it passes through the joint material insertion hole 109.

[0073] At this time, the joint material 1, which is made of an elastic material, attempts to return to its elastic state within the mounting hole 105, causing the second lip portions 30a and 30b to be pressed even more firmly against the lip contact edges 107a and 107b.

[0074] As a result, in addition to the attachment and fixing of the joint material 1 using adhesive, a further water-stopping effect can be obtained through elastic deformation.

[0075] In the joint material 1 of this embodiment, if sufficient water-stopping effect can be obtained by the contact between the lip contact edges 107a, 107b and the second lip portions 30a, 30b, then adhesive fixing can be omitted.

[0076] In other words, it is not necessary to provide an adhesive layer 111 and a primer layer 112 between the lip contact edges 107a, 107b and the outer lip surfaces 33a, 33b of the second lip portions 30a, 30b, respectively. This makes it possible to further simplify the process required for constructing the waterway 100.

[0077] 3. Rupture of the joint due to external force As described above, by using the joint material 1 of this embodiment, it is possible to construct a waterway 100 using a concrete structure 101, which can then be used as an agricultural waterway or the like.

[0078] Furthermore, the joint material 1 of this embodiment also provides the following effects when an external force is applied to the concrete structure 101 (waterway 100). Specifically, when an external force is applied to the concrete structure 101, such as by an earthquake, the distance (joint width) between the end faces 102 of a pair of concrete structures 101 that are arranged facing each other may change.

[0079] In particular, as shown in Figure 6, when the joint width widens, the connecting portion 32 of the second lip portions 30a and 30b breaks, and the connection between the second lip portions 30a and 30b is released. As a result, the angle between the first lip portions 20a and 20b (first angle α) widens.

[0080] At this time, the second lip portions 30a and 30b are connected to the lip contact edges 107a and 107b of the concrete structure 101 by adhesive. Therefore, when the connecting portion 32 breaks, the second lip portions 30a and 30b deform so that their second lip ends 31a and 31b separate from each other (see Figure 6).

[0081] In other words, in Figure 5, the width W2 of the joint material 1, which was elastically deformed and housed in the mounting hole 105, is further expanded. The connecting portion 32, which connected the second lip portions 30a and 30b, forms a fractured portion 34 due to the above fracture. Also, in Figure 6, the structure of the backup material 106 and part of the adhesive layer 111 is not shown.

[0082] Even under these conditions, the joint portion 103 formed by the joint material 1 of this embodiment can maintain its watertightness. That is, even if the joint width deforms, the joint material 1, which is made of an elastic material, can deform to follow this deformation. As a result, the watertightness of the waterway 100 can be sufficiently maintained even when an earthquake occurs.

[0083] Furthermore, even if an external force is applied to the concrete structure 101 (waterway 100) and the joint width narrows, the joint material 1 of this embodiment can maintain its watertightness through elastic deformation.

[0084] For example, if an external force is applied in the state shown in Figure 5, and the joint width, which is the distance between the end faces 102, narrows, the joint material 1 (joint portion 103) can elastically deform and shrink accordingly, even if the backing material 106 is compressed. Specifically, it can deform so that the width W2 of the joint material 1 shown in Figure 5 becomes even narrower. Even in this state, watertightness between the joint material and the concrete structure 101 can be maintained.

[0085] As described above, when connecting concrete structures 101 to construct a waterway 100, the joint material 1 of the present invention allows for the formation of joint portions 103 between concrete structures 101 by a simple process of inserting the joint material 1.

[0086] In addition, even if external forces are applied to the waterway 100 or concrete structure 101 during an earthquake, the joint material 1 (joint section 103) itself can deform in accordance with the change in joint width, thereby maintaining sufficient watertightness. Furthermore, by using EPDM as the material, deterioration due to the effects of ultraviolet rays is suppressed, and stable watertightness can be maintained over a long period of time. [Industrial applicability]

[0087] The joint material for waterways of the present invention has industrial applicability and can be suitably used in the construction of various waterways, such as agricultural waterways. [Explanation of Symbols]

[0088] 1: Joint material (joint material for waterways) 10: Base part 10a: Top surface of the base (base surface) 10b: Base part bottom surface 20a, 20b: First lip section 21a, 21b: First lip end 30a, 30b: Second lip section 31a, 31b: Second lip end 32:Connection part 33a, 33b: Outer surface of the lip (lip bonding surface) 34: Fracture 100: Waterway 101: Concrete Structures 102: End face 103: Joint area 104a, 104b, 104c: End face edges 105: Mounting hole 106: Backup material 107a, 107b: Lip contact edges 108a, 108b: Concrete side 109: Joint material insertion hole 110a, 110b: Bent edges 111: Adhesive layer 112: Primer layer W1: Insertion width W2: Width α: first angle β: second angle

Claims

1. A joint material for a waterway, which is inserted between the end faces of a pair of concrete structures arranged facing each other to form a joint in a waterway, Base part, A pair of first lip portions are provided that protrude from the base surface of the base portion at a predetermined angle, spreading apart from each other and forming a V-shape when viewed from the side, A pair of second lip portions, each having a connecting portion that connects to the first lip end of the first lip portion and connects the second lip ends of each other, forming an inverted V shape when viewed from the side. It is equipped with, The first lip portion and the second lip portion are, Formed from an elastically deformable elastic member, A waterway joint material in which a pair of the second lip portions each abut a part of the concrete structure and is inserted between the end faces of the concrete structure.

2. The aforementioned connecting portion is The concrete structure is formed to be able to break when an external force is applied to it. The waterway joint material according to claim 1, wherein the pair of second lip portions are spaced apart from each other.

3. The aforementioned concrete structure is It has mounting holes into which the aforementioned joint material for waterways is installed, The pair of mounting holes formed by the opposing concrete structures are The waterway joint material according to claim 1, wherein at least a portion of the inverted V-shape formed by the pair of second lip portions forms an inverted V-shape when viewed from the side.

4. The second lip portion is, The waterway joint material according to claim 3, having a lip adhesive surface that is bonded to at least a portion of the mounting hole.

5. The base portion, the pair of first lip portions, and the pair of second lip portions are, The waterway joint material according to claim 1, which is formed by integrally extruding along the longitudinal direction of the waterway joint material.

6. The elastic member is The waterway joint material according to claim 1, which is a rubber elastic member mainly composed of ethylene-propylene-diene rubber.

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