Cut-off material, aqueduct joint structure, and aqueduct joint construction method

Abstract

To provide a cut-off material, an aqueduct joint structure, and an aqueduct joint construction method capable of simplifying a process, shortening a construction period, reducing the number of parts, and reducing cost.SOLUTION: In a cut-off material 11 formed long, a sectional shape orthogonal to a longitudinal direction has a vertically long hollow part 21 and is formed into a tubular shape having side surfaces 25 on both left and right sides of the upper surface via a corner 23, the upper surface is formed by a recess 27, each side surface 25 has a bent projected side surface 29 and a constricted part 31 between the corner 23 and the projected side surface 29, a plurality of fin-like protrusions 33 are formed so as to be vertically spaced apart in the left and right projected side surfaces 29, and the fin-like protrusions 33 incline more upward on the upper side.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a water-stopping material, a joint structure for a water channel, and a method for constructing a joint for a water channel. [Background technology]

[0002] Ditches (waterways) along roads and agricultural waterways can be easily constructed by using precast concrete U-shaped frames. In this case, the joints between the U-shaped frames are watertight with a joint structure that has a watertight function.

[0003] For example, the waterway joint construction method of Patent Document 1 is a waterway joint construction method for sealing the joints of a waterway formed by connecting U-shaped frames, in which a resin foam material, a water-expanding material, and a resin foam material are sequentially sandwiched from the inside of the joint, resin sheet material of a predetermined thickness is attached to each of the edges of adjacent U-shaped frames that sandwich the joint, spaced apart from the joint, sealing material is filled in on the open side of the joint and between the pair of resin sheet materials, excess sealing material is removed by surface treatment to make it flush with the surface of the resin sheet material, and after the sealing material has hardened, the resin sheet material on both sides is peeled off to form the sealing material into a T-shaped cross section in which both wing portions of a predetermined thickness cover both edges of adjacent U-shaped frames that sandwich the joint.

[0004] The joint structure of Patent Document 2 is a waterway made by connecting multiple U-shaped frames, in which a joint material is sandwiched continuously from the bottom of the joint formed between the connected U-shaped frames to the rising ends at both ends, and the joint material comprises a pipe body made of an elastic material and formed in a tubular shape with a hollow portion, and a plurality of internal ridges that protrude from the inner wall surface of the pipe body into the hollow portion, continue linearly along the longitudinal direction of the pipe body, and are provided at intervals in the circumferential direction of the inner wall surface of the pipe. Then, a lower layer resin foam material, a joint material, and an upper layer resin foam material are sandwiched in this order from the deepest inside of the joint of the waterway made by connecting multiple U-shaped frames, and a sealant is filled into the open side of the joint. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5410113 [Patent Document 2] Patent No. 6124608 Summary of the Invention [Problem to be solved by the invention]

[0006] However, conventional joint construction methods and joint structures required additional processes after installing the waterproofing material, such as installing a resin foam material, injecting a filler, and smoothing the surface, which resulted in longer processes and construction time.In addition, the number of parts required was large, which resulted in higher construction costs.

[0007] The present invention has been made in consideration of the above situation, and its purpose is to provide a water-stopping material, a waterway joint structure, and a waterway joint construction method that can simplify the process, shorten the construction period, reduce the number of parts, and reduce costs. [Means for solving the problem]

[0008] Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. The water-stopping material 11 according to claim 1 of the present invention is a water-stopping material 11 formed in a long length, The cross section perpendicular to the longitudinal direction has a vertically long hollow portion 21 and is formed into a tubular shape having side surfaces 25 on both the left and right sides of the upper surface via corners 23, The upper surface is formed with a recess 27, The side surface 25 has a curved convex side surface 29 and a constricted portion 31 between the corner portion 23 and the convex side surface 29, A plurality of fin-like protrusions 33 are formed on the left and right convex side surfaces 29 at intervals in the vertical direction, The plurality of fin-like projections 33 are characterized in that the upper ones are more inclined upward.

[0009] Most of the material in this water-stopping material 11 is non-water-swelling. Non-water-swelling materials have traditionally had problems with weather resistance. For this reason, a sealant (caulking) made of a different material was applied to the surface of the joint 13 to cover and conceal the water-stopping material. In contrast, the non-water-swelling material used in the water-stopping material 11 has improved weather resistance. This makes it possible to place the water-stopping material 11 on the surface of the joint 13. The water-stopping material 11 is installed in the joints 13 of an existing waterway that has already been installed. The water-stopping material 11 is embedded in the joints 13 in order to prevent water leakage. The water-stopping material 11 is installed by filling the joints 13 with new water-stopping material after removing the old water-stopping material from the joints 13 of the waterway 15 that has been water-stopped with the existing water-stopping material. In other words, the water-stopping material 11 is installed by forcing it into the joints 13 from the inside of the waterway 15. The water-stopping material 11 has multiple fin-like protrusions 33 formed on the left and right convex side surfaces 29, spaced apart vertically. The fin-like protrusions 33 protrude more upwardly as they are positioned higher. The water-stopping material 11 is inserted into the joint 13 with its convexly curved, downward-hanging base 39 connecting the left and right convex side surfaces 29 serving as the insertion tip. Since the fin-like protrusions 33 on the left and right side surfaces 25 are more upwardly slanted as they are positioned higher, the water-stopping material 11 deforms in the direction of inclination (folds) when inserted, facilitating insertion. However, once the water-stopping material 11 is inserted into the specified position in the joint 13, the fin-like protrusions 33 exert a strong frictional force in the direction of removal, preventing the material from coming out of the joint 13. In particular, in areas where water seeps from the back side of the joint 13, the water-stopping material 11 is subjected to backwater pressure. In response to this, the water-stopping material 11 is inclined in a direction that restricts the fin-like projections 33 from coming off, so it can strongly resist the back water pressure that acts in the direction of pushing up in the joint, thereby increasing the adhesive durability in the joint. As the waterstop material 11 is packed into the joint 13, the left and right side surfaces 25 that sandwich the hollow portion 21 are compressed by the opposing seal surfaces 41. In other words, the waterstop material 11 is compressed and deformed by the compressive forces applied to the side surfaces 25 from the left and right. This compressive deformation causes the thickness of the waterstop material 11 from the constricted portion 31 to the top surface to change, and when the waterstop material 11 is placed in a predetermined position in the joint 13, the recessed portion 27 bulges out. As a result, the recessed portion 27 on the top surface of the waterstop material 11 is exposed as a flat surface that is continuous with the joint 13.

[0010] The water-stopping material 11 according to claim 2 of the present invention is the water-stopping material 11 according to claim 1, At least one of the fin-like projections 33 is made of a water-swellable material.

[0011] In this water-stopping material 11, at least one of the fin-like projections 33 is made of a water-swellable material. Preferably, each of the left and right fin-like projections 33 is molded from a single piece of water-swellable material. In other words, the water-stopping material 11 has two fin-like projection groups, one on each of the left and right side surfaces 25, molded integrally. The water-swellable material itself has the resilience characteristic of rubber. Furthermore, when water is supplied to the water-swellable material, its volume increases due to its water-swelling properties. The water-stopping material 11 is integrally molded with a set of fin-like projections incorporated into each of the left and right side surfaces 25, and is filled into the joints 13, so that the fin-like projections are positioned between the water-stopping material main body 37 made of a non-water-swelling material and the opposing sealing surface 41. Therefore, when the water-stopping material 11 is set in the specified position in the joint 13, it comes into close contact with the opposing seal surface 41 due to the repulsive force inherent to rubber, and if water is supplied in this state, the increase in volume causes it to come into close contact with the opposing seal surface 41 with even greater pressure.

[0012] The water-stopping material 47 according to claim 3 of the present invention is the water-stopping material 47 according to claim 1 or 2, A vertical partition wall 51 is formed in the hollow portion 49 to divide the hollow portion 49 into left and right portions.

[0013] In this water-stopping material 47, a vertical partition wall 51 is formed in the hollow portion 49, dividing the hollow portion 49 into left and right halves. By forming the partition wall 51, the hollow portion 49 is divided into a left hollow half portion 53 and a right hollow half portion 53. The lower end of this partition wall 51 is connected to the bottom portion 39 of the water-stopping material main body 37, and the upper end is connected to the lower part of the upper surface of the water-stopping material main body 37. In other words, the partition wall 51 acts as a pillar connecting the bottom portion 39 and the lower part of the upper surface. The partition wall 51 acts as a pillar to support a load that presses down on the upper surface. In other words, by providing the partition wall 51, the water-stopping material 47 has a higher load-bearing capacity on the upper surface when packed compared to a structure without the partition wall 51. This makes it easier to pack the water-stopping material 47. Furthermore, when the water-stopping material 47 receives a compressive force from the opposing seal surface 41, a greater stress is generated on the side surface 25 than in a structure without the partition wall 51 in the hollow portion 49. In other words, the provision of the partition wall 51 allows for a greater repulsive force when packed into the joint 13 than in a structure without the partition wall 51. This is thought to be because when a compressive force is applied to both side surfaces of the water-stopping material 47, the central partition wall 51 is pulled up and down, generating a reaction force outward from both side surfaces. Furthermore, when compressive forces are applied to both sides of the water-stopping material 47, the thickness of the material changes, causing the top surface and the bottom portion 39 to deform in a direction that separates them vertically. In other words, the water-stopping material 47 extends in the vertical direction. At this time, the extension of the water-stopping material main body 37 is suppressed by the partition wall 51 that connects the lower part of the top surface and the bottom portion 39. In this way, in the water-stopping material 47 having a partition wall portion 51 provided in the hollow portion 49, by adjusting the thickness of the partition wall portion 51, it is possible to easily control the contact pressure of the fin-shaped protrusion group when compressed and deformed from the opposing sealing surface 41, and the amount of deformation of the upper surface, i.e., the recess 27.

[0014] The water-stopping material 47 according to claim 4 of the present invention is the water-stopping material 47 according to claim 3, The left and right hollow halves 53 divided by the partition wall 51 are each formed with a corner 55 protruding inward at the position of the constricted portion 31 .

[0015] In this water-stopping material 47, a protruding corner portion 55 that protrudes inward at the position of the constricted portion 31 is formed in the left and right hollow half portions 53 divided by the partition portion 51. In the water-stopping material main body portion 37, the constricted portion 31 is formed between the corner portion 23 and the convex side surface 29. The constricted portion 31 can impart a structure to the outer shape that exhibits good sealing performance. On the other hand, if the thickness of the constricted portion 31 is extremely thin compared to other portions, the constricted portion 31 becomes weak when subjected to compressive force from the opposing seal surface 41, and is subject to significant deformation due to stress concentration. This makes it difficult for the recess 27 to form a flat surface, and makes it impossible to generate an appropriate repulsive force in the fin-shaped projections. Therefore, by forming a corner portion 55 that protrudes inward at the position of the constricted portion 31, the water-stopping material 47 is given an external shape that exhibits good sealing performance, while preventing the constricted portion 31 from becoming a weak portion, making it easy to generate an appropriate repulsive force in the fin-shaped projection group.

[0016] The water-stopping material 47 according to claim 5 of the present invention is the water-stopping material 47 according to claim 4, The constricted portion 31 is characterized in that a protruding portion 57 having a semicircular cross section that protrudes outward is formed.

[0017] In this water-stopping material 47, a protruding portion 57 with a semicircular cross section that protrudes outward is formed in the constricted portion 31. Because the water-stopping material 47 has the protruding portion 57 provided in the constricted portion 31, when the water-stopping material 47 is packed into the joint 13, the protruding portion 57 receives a reaction force from the opposing seal surface 41. Therefore, the water-stopping material 47 can obtain a higher contact pressure with the opposing seal surface 41 than when the protruding portion 57 is not provided. Furthermore, since the protruding portions 57 of the water-stopping material 47 are symmetrically arranged on the left and right constricted portions 31, the reaction force received from the opposing seal surface 41 acts equally on the left and right. Also, by making the protruding length of the protruding portions 57 slightly shorter than the protruding length of the fin-shaped projection group, it is possible to reduce the excessive reaction force acting on the fin-shaped projection group from the opposing seal surface 41. In other words, the water-stopping material 47 can generate a large contact pressure against the opposing seal surface 41 while generating an optimal contact pressure on the fin-shaped projection group.

[0018] The joint structure of the water channel 15 according to claim 6 of the present invention is a joint structure of the water channel 15 in which the joint 13 between the U-shaped frames is sealed by the water-stopping material 11 according to claim 1 or claim 2, The left and right fin-shaped protrusions 33 of the water-stopping material 11 are in contact with the opposing sealing surfaces 41 of the left and right U-shaped frames 17 that sandwich the joint 13, respectively, and the water-stopping material 11 sandwiched between the left and right opposing sealing surfaces 41 is compressed and deformed, so that the recess 27 on the upper surface is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17.

[0019] In the joint structure of this water channel 15, the left and right fin-shaped protrusions 33 of the water-stopping material 11 contact the opposing sealing surfaces 41 of the U-shaped frame 17 that sandwich the joint 13, and the water-stopping material 11 is compressed and deformed, so that the recess 27 is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17. The fin-like projections 33 exert a strong frictional force in the direction restricting separation, making it difficult for the water-stopping material 11 to come off the joint 13. The water-stopping material 11 changes thickness from the constricted portion 31 to the upper surface due to compression deformation, and when it is set in a predetermined position in the joint 13, the recessed portion 27 bulges out. As a result, the recessed portion 27 on the upper surface of the water-stopping material 11 is exposed as a flat surface that is continuous with the joint 13. In addition, if a water-swellable material is used for at least one of the fin-like projections 33, the rubber-specific repulsive force of the water-swellable material can provide water-stopping performance for the opposing seal surface 41 under normal circumstances (when no water is supplied), and when water is supplied, the volume of the water-swellable material increases, allowing the fin-like projections to be pressed tightly against the opposing seal surface 41 with even greater pressure.

[0020] The joint structure of the water channel 15 according to claim 7 of the present invention is the joint structure of the water channel 15 according to claim 6, The water-stop material 47 according to claim 3 seals the joints 13 between the U-shaped frames.

[0021] In the joint structure of this waterway 15, the left and right fin-shaped protrusions 33 of the water-stopping material 47 contact the opposing sealing surfaces 41 of the U-shaped frame 17 that sandwich the joint 13, and the water-stopping material 47 is compressed and deformed, so that the recess 27 is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17. In addition, by forming the partition wall 51 in the water-stopping material 47, the partition wall 51 acts as a pillar connecting the bottom 39 and the lower part of the upper surface. In this joint structure, when a compressive force is applied from the opposing seal surface 41, a large stress is generated in the side surface 25, compared to a structure in which the hollow portion 49 of the water-stopping material 47 does not have the partition wall 51. Therefore, in this joint structure, by adjusting the thickness of the partition wall portion 51, it is possible to easily control the contact pressure of the fin-shaped protrusion group when compressed and deformed from the opposing seal surface 41, and the amount of deformation of the upper surface (recess 27).

[0022] The joint structure of the water channel 15 according to claim 8 of the present invention is the joint structure of the water channel 15 according to claim 6, The water-stop material 47 according to claim 4 seals the joints 13 between the U-shaped frames.

[0023] In the joint structure of this waterway 15, the left and right fin-shaped protrusions 33 of the water-stopping material 47 contact the opposing sealing surfaces 41 of the U-shaped frame 17 that sandwich the joint 13, and the water-stopping material 47 is compressed and deformed, so that the recess 27 is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17. In addition, the water-stopping material 47 of this joint structure has a projecting corner portion 55 that projects inward at the position of the constricted portion 31. Therefore, in this joint structure, by forming a corner portion 55 in the water-stopping material 47, it is possible to easily generate an appropriate repulsive force in the fin-shaped projection group while giving it an external shape that exhibits good sealing performance.

[0024] The joint structure of the water channel 15 according to claim 9 of the present invention is the joint structure of the water channel 15 according to claim 6, The water-stop material 47 according to claim 5 seals the joints 13 between the U-shaped frames.

[0025] In the joint structure of this waterway 15, the left and right fin-shaped protrusions 33 of the water-stopping material 47 contact the opposing sealing surfaces 41 of the U-shaped frame 17 that sandwich the joint 13, and the water-stopping material 47 is compressed and deformed, so that the recess 27 is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17. In addition, the water-stopping material 47 with this joint structure has a protruding portion 57 formed at the constricted portion 31 that protrudes outward and has a semicircular cross section. Therefore, with this joint structure, a higher contact pressure can be obtained with the opposing seal surface 41 than when the water-stopping material 47 does not have the protrusion 57, and it is possible to generate an optimal contact pressure on the fin-shaped protrusion group while generating a large contact pressure with the opposing seal surface 41.

[0026] The joint construction method for a water channel 15 according to claim 10 of the present invention is a joint construction method for a water channel 15 in which the joint 13 of the water channel 15 formed by connecting U-shaped frames is sealed with a long water-stopping material 11, The water-stopping material 11 has a cross-sectional shape perpendicular to the longitudinal direction, which has a vertically elongated hollow portion 21 and a recess 27 on the upper surface, The water-stopping material 11 is compressed and deformed within the width of the joint 13, so that the recess 27 on the upper surface is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17.

[0027] In this method for constructing joints for a waterway 15, the waterway 15 is sealed with an existing waterstop material, and after removing the old waterstop material from the joints 13, new waterstop material 11 is packed into the joints 13. In other words, the waterstop material 11 is installed by forcing it into the joints 13 from the inside of the waterway 15. When the water-stopping material 11 is packed into the joint 13 by being pushed from the inside of the water channel 15, the left and right side surfaces 25 receive compressive force from the opposing sealing surfaces 41 of the left and right U-shaped frames 17, causing the water-stopping material 11 to undergo compressive deformation in a direction narrowing its left and right width. At this time, the hollow portion 21 of the water-stopping material 11 narrows and it stretches in the vertical direction, and at the same time, internal stress accumulates. In this method of constructing joints for a waterway 15, the internal stress accumulated in the water-stopping material 11 due to compressive deformation acts as a repulsive force, displacing the recess 27 into a flat surface, or as an adhesive force that presses the fin-shaped projections against the opposing sealing surface 41. [Effects of the Invention]

[0028] According to the waterstop material of claim 1 of the present invention, when the waterstop material is compressed and deformed, the recesses on the upper surface become a flat surface that is continuous with the joints, eliminating the need for additional processes such as installing a resin foam material, injecting a filler, and smoothing the surface, thereby simplifying the process, shortening the construction period, reducing the number of parts, and reducing costs.In addition, because the joints become a flat surface, damage to the waterstop material due to water flow and the occurrence of waterway fouling can be suppressed.

[0029] According to the water-stopping material of claim 2 of the present invention, the fin-shaped protrusions on both sides of the water-stopping material come into contact with the opposing sealing surfaces adjacent to each other across the joint, and the repulsive force unique to the rubber of the water-expanding material can suppress water leakage between the opposing sealing surfaces and the fin-shaped protrusions.In addition, when water is supplied to the fin-shaped protrusions, the increase in volume due to the water-expanding performance increases the contact pressure, improving water-stopping properties and more effectively preventing water leakage.

[0030] According to the water-stopping material of claim 3 of the present invention, by providing a vertical partition wall in the hollow section, when compressive force is applied from the adjacent opposing sealing surfaces across the joint, greater stress is generated on the side compared to a structure without a partition wall, thereby improving water-stopping properties. In addition, by providing a partition wall in the center of the hollow section, the recess on the upper surface can be prevented from extending too far upward. The partition wall also supports the recess. This prevents the flat upper surface from protruding or sinking from the inner surface of the U-shaped frame.

[0031] According to the water-stopping material of claim 4 of the present invention, a corner portion that protrudes inward is formed at the position of the constricted portion, so that the thickness increases at the position of the constricted portion, and when subjected to a compressive force from the opposing sealing surface, the constricted portion is excessively deformed, the repulsive force of the fin-shaped protrusions is reduced, and a decrease in water-stopping properties can be prevented.

[0032] According to the water-stop material of claim 5 of the present invention, the constricted portion is provided with a protrusion that protrudes outward from the side, which provides high contact pressure with the opposing seal surface and improves water-stopping properties. In addition, the reaction force of the protrusion tends to make the gap between the opposing seal surface and the side surface equal on both sides, which suppresses uneven contact pressure and uneven deformation on the fin-shaped protrusions and prevents a decrease in water-stopping properties due to the fin-shaped protrusions.

[0033] According to the waterway joint structure of claim 6 of the present invention, the waterstop material having a recess on its upper surface is compressed and deformed, and the recess is exposed as a flat surface continuous with the inner surface of the U-shaped frame, and the fin-shaped protrusions come into contact with the opposing sealing surface of the U-shaped frame, which prevents damage to the waterstop material due to water flow and the occurrence of waterway fouling, while eliminating the need for additional processes such as installing a resin foam material, injecting a filler material, and smoothing the surface, thereby simplifying the process, shortening the construction period, reducing the number of parts, and reducing costs. Furthermore, if a water-swelling material is used for the fin-shaped protrusions, the increased volume allows them to come into close contact with the opposing sealing surface with strong pressure, resulting in high waterstop performance.

[0034] According to the waterway joint structure described in claim 7 of the present invention, a vertical partition wall is provided in the hollow section, which generates large stress on the sides and improves water-stopping properties, while eliminating the need for additional processes such as installing resin foam material, injecting filler material, and smoothing the surface, thereby simplifying the process, shortening the construction period, reducing the number of parts, and reducing costs.

[0035] According to the waterway joint structure described in claim 8 of the present invention, a corner portion is formed at the position of the constricted portion, thereby eliminating the need for additional processes such as installing resin foam material, injecting filler material, and smoothing the surface while suppressing a decrease in water-stopping properties, thereby simplifying the process, shortening the construction period, reducing the number of parts, and reducing costs.

[0036] According to the waterway joint structure described in claim 9 of the present invention, a protrusion that protrudes outward from the side is provided at the narrowed portion, thereby obtaining high contact pressure and improving water-stopping properties, while eliminating the need for additional processes such as installing resin foam material, injecting filler material, and smoothing the surface, thereby simplifying the process, shortening the construction period, reducing the number of parts, and reducing costs.

[0037] According to the method for constructing joints in a waterway described in claim 10 of the present invention, a water-stopping material having a cross-sectional shape perpendicular to the longitudinal direction with a vertically long hollow portion and a recess on its upper surface is compressed and deformed within the width of the joint between adjacent U-shaped frames, so that the recess is exposed as a flat surface that is continuous with the inner surface of the U-shaped frame, thereby eliminating the need for additional processes such as installing a resin foam material, injecting a filler material, and smoothing the surface, thereby simplifying the process, shortening the construction period, reducing the number of parts, and reducing costs. [Brief explanation of the drawings]

[0038] [Figure 1] This is an oblique view of a waterway in which the joints between U-shaped frames are sealed with a water-stopping material according to this embodiment. [Figure 2] 1 is a cross-sectional view perpendicular to the longitudinal direction of a water-stopping material according to a first embodiment. [Figure 3] FIG. 2 is a cross-sectional view showing an example of dimensions of the water-stopping material according to the first embodiment. [Figure 4] FIG. 2 is a cross-sectional view showing the joint structure of a water channel in which the joint is sealed with the water-stopping material according to the first embodiment. [Figure 5] FIG. 3 is a cross-sectional view of a water-stopping material according to a modified example of the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view perpendicular to the longitudinal direction of a water-stopping material according to a second embodiment. [Figure 7] FIG. 10 is a cross-sectional view showing the joint structure of a water channel in which the joint is sealed with a water-stopping material according to a second embodiment. [Figure 8] FIG. 10 is a cross-sectional view of a water-stopping material according to a modified example of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0039] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a water channel 15 in which joints 13 between U-shaped frames are sealed with a water-stopping material 11 according to this embodiment. The water-stopping material 11 according to this embodiment is packed into the joints 13 in order to prevent water leakage. The water-stopping material 11 according to this embodiment is provided in the joints 13 of an existing waterway. Examples of the waterway 15 include waterways 15 such as gutters along roads, waterways 15 for agricultural use, and waterways 15 for hydroelectric power generation.

[0040] The waterway 15 is formed by connecting U-shaped frames 17 made of, for example, precast concrete. In a waterway 15 made by connecting multiple U-shaped frames 17, the inside of the U-shape becomes the inner surface 19 through which water flows. Joints 13 are formed with equal widths between adjacent U-shaped frames. Note that the waterstop material 11 is not limited to waterways 15 using U-shaped frames 17, but can also be applied to joints 13 of waterways 15 using frames other than U-shaped frames.

[0041] FIG. 2 is a cross-sectional view perpendicular to the longitudinal direction of the water-stopping material 11 according to the first embodiment. The water-stopping material 11 according to the first embodiment is formed into a long length by extrusion molding. The water-stopping material 11 has a vertically long hollow portion 21 in a cross section perpendicular to the longitudinal direction. As an example, the hollow portion 21 can be an ellipse with the major axis extending in the up-down direction and the minor axis extending in the left-right direction. However, the shape of the hollow portion 21 is not limited to an ellipse, as will be described later.

[0042] The water-stopping material 11 is formed in a tubular shape with side surfaces 25 via corners 23 on both the left and right sides of the top surface. The top surface is formed with a recess 27. The side surfaces 25 have curved convex side surfaces 29 and a constricted portion 31 between the corners 23 and the convex side surfaces 29. A plurality of fin-like projections 33 are formed spaced apart vertically on the left and right convex side surfaces 29. A plurality of fin-like projections 33 are formed, for example, three in this embodiment, and the fin-like projections 33 are inclined upward as they approach the top.

[0043] In the waterstop material 11, at least one of the fin-shaped projections 33 is made of a water-swellable material. In this embodiment, the multiple fin-shaped projections 33 spaced apart vertically are connected to a base portion 35 and molded integrally. The multiple fin-shaped projections 33 protruding from the base portion 35 constitute a fin-shaped projection group. The base portion 35 has a convex side surface 29 that extends vertically and is convex outward, causing the fin-shaped projections 33 to protrude. The waterstop material 11 is molded integrally with a structure in which this base portion 35 is integrally fitted into the left and right side surfaces 25 of the waterstop material main body portion 37. In this embodiment, the three fin-shaped projections 33 in the lower, middle, and upper rows of the fin-shaped projection group protrude from the base portion 35 with approximately the same protrusion length.

[0044] The water-swelling material 11 has a main body 37 made of a non-water-swelling material. The base 35 and fin-like projections 33 are made of a water-swelling material. The water-swelling material 11 is placed only on the opposing sealing surface, allowing the direction of expansion pressure to be controlled. The non-water-swelling material is made of a conventional rubber material, such as vulcanized rubber, which has the property of not changing volume when exposed to water. Vulcanized rubber is made of natural rubber and synthetic rubbers, such as isoprene rubber, styrene-butadiene rubber, chloroprene rubber, butadiene rubber, nitrile rubber, ethylene-propylene rubber, and butyl rubber. On the other hand, the water-swelling material has the property of expanding volume upon absorbing water. The water-swelling material is made of a water-swelling rubber material obtained by mixing, molding, and vulcanizing a highly absorbent resin as a water-swelling resin and a synthetic rubber as a rubber material.

[0045] FIG. 3 is a cross-sectional view showing an example of various dimensions of the water-stopping material 11 according to the first embodiment. The water-stopping material 11 is formed so that the left and right sides are line-symmetrical about the long axis. The top surface of the water-stopping material 11 is formed as a recess 27 having a concave curved surface with a curvature radius R. The arc length W in the left-right direction along this concave curved surface is approximately equal to the width M of the joint 13 (see Figure 4). As an example, the water-stopping material 11 can have a left-right width of 20 mm and a top-to-bottom height of 24.7 mm. The left-right width is the minimum width between the left and right side surfaces.

[0046] Next, the correlations of various dimensions in the water stop material 11 will be described. The shortest distance from the deepest part of the concave portion 27 to the hollow portion 21 is T1. The shortest distance from the lower end of the hollow portion 21 to the lower end of the bottom portion 39 is T2. The thickness from the convex side surface 29 to the hollow portion 21 is T3. The thickness of the base portion 35 is T4. At this time, the relationship T2 < T1 < T3 holds. Also, the relationship T4 ≈ T3 / 2 holds.

[0047] Also, the angle formed by the center line passing through the fin-shaped protrusion 33 in the lower stage and the horizontal line perpendicular to the long axis is α1. The angle formed by the center line passing through the fin-shaped protrusion 33 in the middle stage and the horizontal line perpendicular to the long axis is α2. The angle formed by the center line passing through the fin-shaped protrusion 33 in the upper stage and the horizontal line perpendicular to the long axis is α3. At this time, the relationship α1 < α2 < α3 holds.

[0048] The water stop material 11 is prepared in a plurality of product sizes so as to be able to correspond to a plurality of joint widths. In this case, variations can be obtained by scaling the shape based on the water stop material 11 having the basic shape. Note that for the reduced version of the water stop material 11, it is preferable that the short-axis dimension of the hollow portion 21 is 3 mm or more for performing good molding.

[0049] FIG. 4 is a cross-sectional view showing the joint structure of the water channel 15 sealed by the water stop material 11 according to the first embodiment. In the joint structure of the water channel 15 using the water stop material 11, the joint 13 of the water channel 15 is sealed watertightly by the water stop material 11. The water stop material 11 is provided at the joint 13 of the existing water channel composed of the already provided U-shaped frame 17 or the like.

[0050] In the joint structure of the water channel 15, the left and right fin-shaped protrusions 33 of the water stop material 11 respectively contact the opposing seal surfaces 41 of the left and right U-shaped frames 17 sandwiching the joint 13. The water stop material 11 is provided at the joint 13 in a state of being compressed and deformed by the compressive force from the left and right by being packed into the joint 13 having a width length M narrower than the normal width length. The water stop material 11 sandwiched between the left and right opposing seal surfaces 41 is compressed and deformed, and the concave portion 27 on the upper surface appears (bulges) as a flat surface continuous with the inner surface 19 of the U-shaped frame 17.

[0051] In a method for constructing joints in a water channel 15 using the waterstop material 11, for example, joints 13 in a water channel 15 formed by connecting U-shaped frames are sealed with a long waterstop material 11. The waterstop material 11 has a cross-sectional shape perpendicular to the longitudinal direction, with a vertically long hollow portion 21, and a recess 27 on the upper surface.

[0052] In the joint construction method for sealing the joint 13 using the water-stopping material 11, the old water-stopping material is removed from the joint 13, and then new water-stopping material 11 is packed into the joint 13. The water-stopping material 11 is installed by forcing it into the joint 13 from the inner surface side of the waterway 15. In the joint construction method, the water-stopping material 11 is compressed and deformed within the width of the joint 13, and the recess 27 on the upper surface is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17, completing the construction.

[0053] Next, the operation of the configuration according to the first embodiment will be described.

[0054] The water-stopping material 11 according to the first embodiment is mostly made of a non-water-swelling material. Conventionally, non-water-swelling materials have had problems with weather resistance. For this reason, a sealant (caulking) made of a different material has been applied to the surface of the joint 13 to cover and conceal the water-stopping material. In contrast, the non-water-swelling material used in the water-stopping material 11 has improved weather resistance. This makes it possible to place the top surface of the water-stopping material 11 on the surface of the joint 13.

[0055] The water-stopping material 11 is installed in the joints 13 of an existing waterway that has already been installed. The water-stopping material 11 is embedded in the joints 13 in order to prevent water leakage. The water-stopping material 11 is installed by filling the joints 13 with new water-stopping material after removing the old water-stopping material from the joints 13 of the waterway 15 that has been water-stopped with the existing water-stopping material. In other words, the water-stopping material 11 is installed by forcing it into the joints 13 from the inside of the waterway 15.

[0056] The water-stopping material 11 has a plurality of fin-like projections 33 formed on the left and right convex side surfaces 29, spaced apart from one another vertically. The upper ones of the fin-like projections 33 are more inclined upward. The water-stopping material 11 is inserted into the joint 13 with its convexly curved, hanging-down bottom 39 connecting the left and right convex side surfaces 29 as the insertion tip. At this time, the upper ones of the fin-like projections 33 provided on the left and right side surfaces 25 are more inclined upward, so that they deform in the direction of insertion, collapsing (folding) in the inclined direction, making insertion easier.

[0057] On the other hand, when the water-stopping material 11 is inserted into a predetermined position in the joint 13, the fin-shaped projections 33 act as a strong frictional force in the direction that restricts the material from coming out (detaching) from the joint 13, making it difficult to come out of the joint 13. In particular, on ground where water seeps out from the back side of the joint 13, backside water pressure is applied to the water-stopping material 11. Against this, the water-stopping material 11 is inclined in the direction that restricts the fin-shaped projections 33 from coming out, so it can strongly resist the backside water pressure that acts in the direction that pushes it up within the joint, thereby improving the durability of the adhesion within the joint.

[0058] As the waterstop material 11 is packed into the joint 13, the left and right side surfaces 25 that sandwich the hollow portion 21 are compressed by the opposing seal surfaces 41. In other words, the waterstop material 11 is compressed and deformed by the compressive forces applied to the side surfaces 25 from the left and right. This compressive deformation causes the thickness of the waterstop material 11 from the constricted portion 31 to the top surface to change, and the recessed portion 27 bulges out while the waterstop material 11 is fitted in a predetermined position in the joint 13. As a result, the recessed portion 27 on the top surface of the waterstop material 11 is exposed as a flat surface that is continuous with the joint 13.

[0059] Furthermore, in this water-stopping material 11, at least one of the fin-like projections 33 is made of a water-swellable material. Preferably, each of the left and right fin-like projections 33 is molded from a single piece of water-swellable material. In other words, the water-stopping material 11 has two fin-like projection groups, one on each of the left and right side surfaces 25, molded integrally. The water-swellable material itself has the resilience characteristic of rubber. Furthermore, when water is supplied to the water-swellable material, its volume increases due to its water-swelling properties.

[0060] The water-stop material 11, which is integrally molded with a set of fin-like projections incorporated into each of the left and right side surfaces 25, is filled into the joints 13, so that the fin-like projections are arranged between the water-stop material main body 37 made of a non-water-swelling material and the opposing seal surface 41.

[0061] Therefore, when the waterstop material 11 is set in a predetermined position in the joint 13, the repulsive force characteristic of rubber causes it to come into close contact with the opposing seal surface 41. If water is supplied in this state, the increase in volume causes it to come into even stronger contact with the opposing seal surface 41. As a result, the fin-shaped projections 33 provided on both sides of the waterstop material 11 come into contact with the opposing seal surface 41 adjacent to it across the joint 13, and the repulsive force characteristic of rubber, which is a water-swelling material, can suppress water leakage from between the opposing seal surface 41 and the fin-shaped projections 33. Furthermore, if water is supplied to the fin-shaped projections 33, the increase in volume due to the water-swelling property increases the contact pressure, improving watertightness and more reliably preventing water leakage.

[0062] In the joint structure of the water channel 15 in this embodiment, the left and right fin-shaped protrusions 33 of the water-stopping material 11 each contact the opposing sealing surfaces 41 of the U-shaped frame 17 that sandwich the joint 13, and the water-stopping material 11 is compressed and deformed, so that the recess 27 is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17.

[0063] In the joint structure of this water channel 15, the fin-like projections 33 exert a strong frictional force in the direction restricting separation, making it difficult for the waterstop material 11 to come off the joint 13. In the joint structure of the water channel 15, the waterstop material 11 undergoes compressive deformation, causing the thickness from the constricted portion 31 to the upper surface to change, and when it is set in a predetermined position in the joint 13, the recessed portion 27 bulges out. As a result, in the joint structure of the water channel 15, the recessed portion 27 on the upper surface of the waterstop material 11 is exposed as a flat surface that is continuous with the joint 13.

[0064] In addition, if a water-expandable material is used for at least one of the fin-like protrusions 33 in the joint structure of the water channel 15, the rubber-specific resilience of the water-expandable material will provide water-stopping performance for the opposing seal surface 41 in normal times (when no water is supplied), and when water is supplied, the volume of the water-expandable material will increase, allowing the fin-like protrusions to be pressed tightly against the opposing seal surface 41 with even greater pressure.

[0065] In the joint construction method for a water channel 15 according to this embodiment, the water channel 15 is sealed with an existing water-stop material, and after the old water-stop material is removed from the joint 13, new water-stop material 11 is packed into the joint 13. In other words, the water-stop material 11 is installed by forcing it into the joint 13 from the inside of the water channel 15.

[0066] When the water-stopping material 11 is packed into the joint 13 by being pushed from the inside of the water channel 15, the left and right side surfaces 25 receive compressive force from the opposing sealing surfaces 41 of the left and right U-shaped frames 17, causing the water-stopping material 11 to undergo compressive deformation in a direction narrowing its left and right width. At this time, the hollow portion 21 of the water-stopping material 11 narrows and it stretches in the vertical direction, and at the same time, internal stress accumulates.

[0067] In this method of constructing joints for a waterway 15, the internal stress accumulated in the water-stopping material 11 due to compressive deformation acts as a repulsive force, displacing the recess 27 into a flat surface, or as an adhesive force that presses the fin-shaped projections against the opposing sealing surface 41.

[0068] FIG. 5 is a cross-sectional view of a water-stopping material 43 according to a modified example of the first embodiment. In the configuration of the water-stopping material 11 according to the first embodiment, the hollow portion 21 is a vertically long oval, but the hollow portion 45 may be an elongated hole whose vertically long oval shape narrows downward. In this case, the thickness of the lower portion of the water-stopping material can be made thicker than that of the upper portion, thereby increasing the elastic repulsive force of the lower portion of the water-stopping material.

[0069] In addition, in the water-stopping material 11 according to the first embodiment, the three fin-shaped projections 33 in the lower, middle, and upper stages of the fin-shaped projection group project from the base portion 35 with the same projection length, but in the water-stopping material 43, the projection lengths L1, L2, and L3 of the three fin-shaped projections 33 from the upper stage to the middle stage and lower stage are gradually increased (L1 <L2<L3)されてもよい。

[0070] Next, a second embodiment will be described.

[0071] 6 is a cross-sectional view perpendicular to the longitudinal direction of a water-stopping material 47 according to the second embodiment. In the second embodiment, the same members and parts as those shown in the first embodiment are denoted by the same reference numerals, and redundant explanations will be omitted. In the water-stopping material 47 according to the second embodiment, a vertical partition wall 51 is formed in a hollow portion 49 to divide the hollow portion 49 into left and right portions. By providing the partition wall 51, the single hollow portion 49 is divided into a left hollow half portion 53 and a right hollow half portion 53.

[0072] The water-stopping material 47 is divided into left and right hollow halves 53 by the partition wall 51, and has corners 55 that protrude inward at the positions of the constricted portions 31.

[0073] Furthermore, the water-stopping material 47 may have a protruding portion 57 formed at the constricted portion 31 that protrudes outward and has a semicircular cross section.

[0074] FIG. 7 is a cross-sectional view showing the joint structure of a water channel 15 in which the joint 13 is sealed with a water-stopping material 47 according to the second embodiment. In the joint structure of the water channel 15 using the water stop material 47, the joint 13 of the water channel 15 is sealed watertight by the water stop material 47. The water stop material 47 is provided in the joint 13 of an existing water channel consisting of an already installed U-shaped frame 17 or the like.

[0075] In the joint structure of the waterway 15, the left and right fin-like protrusions 33 of the waterstop material 47 contact the opposing seal surfaces 41 of the left and right U-shaped frames 17 that sandwich the joint 13. The waterstop material 47 is packed into the joint 13, which has a width M that is narrower than its normal width, and is provided in the joint 13 in a state where it is compressed and deformed by compressive forces from the left and right. The waterstop material 47 sandwiched between the left and right opposing seal surfaces 41 is compressed and deformed, and the recessed portions 27 on its upper surface are exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17.

[0076] In the method for constructing joints in a water channel 15 using a waterstop material 47, for example, joints 13 in a water channel 15 formed by connecting U-shaped frames are sealed with a long waterstop material 47. The waterstop material 47 has a cross-sectional shape perpendicular to the longitudinal direction, with a vertically long hollow portion 49, and a recess 27 on the upper surface.

[0077] In the joint construction method for waterproofing the joint 13 using the water-stopping material 47, the old water-stopping material is removed from the joint 13, and then new water-stopping material 47 is packed into the joint 13. The water-stopping material 47 is installed by forcing it into the joint 13 from the inner surface side of the waterway 15. In the joint construction method, the water-stopping material 47 is compressed and deformed within the width of the joint 13, and the recess 27 on the upper surface is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17, thereby completing the construction.

[0078] FIG. 8 is a cross-sectional view of a water-stopping material 59 according to a modified example of the second embodiment. In the configuration of the water-stopping material 47 according to the second embodiment, the protruding portion 57 is provided in the constricted portion 31, but the protruding portion 57 may be omitted from the constricted portion 31. In this case, the water-stopping material 59 from which the protruding portion 57 is omitted can have a simple shape, which can facilitate the manufacture of a mold and the production of a molded product.

[0079] Next, the operation of the configuration according to the second embodiment will be described.

[0080] In this water-stopping material 47, a vertical partition wall 51 is formed in the hollow portion 49, dividing the hollow portion 49 into left and right halves. By forming the partition wall 51, the hollow portion 49 is divided into a left hollow half portion 53 and a right hollow half portion 53. The lower end of this partition wall 51 is connected to the bottom portion 39 of the water-stopping material main body 37, and the upper end is connected to the lower part of the upper surface of the water-stopping material main body 37. In other words, the partition wall 51 acts as a pillar connecting the bottom portion 39 and the lower part of the upper surface.

[0081] The partition wall 51 acts as a pillar to support a load that presses down on the upper surface. In other words, by providing the partition wall 51, the water-stopping material 47 has a higher load-bearing capacity on the upper surface when packed compared to a structure without the partition wall 51. This makes it easier to pack the water-stopping material 47.

[0082] Furthermore, when the water-stopping material 47 receives compressive force from the opposing sealing surfaces 41 on the left and right sides, greater stress is generated on the side surfaces 25 than in a structure without partition walls 51 in the hollow portion 49. In other words, the provision of partition walls 51 allows for a greater repulsive force when packed into the joint 13 than in a structure without partition walls 51. This is thought to be because when compressive force is applied from both sides of the water-stopping material 47, the central partition walls 51 are pulled up and down, generating outward reaction forces from both sides.

[0083] Furthermore, when compressive forces are applied to both sides of the water-stopping material 47, the thickness of the material changes, causing the top surface and the bottom portion 39 to deform in a direction that separates them vertically. In other words, the water-stopping material 47 extends in the vertical direction. At this time, the extension of the water-stopping material main body 37 is suppressed by the partition wall 51 that connects the lower part of the top surface and the bottom portion 39.

[0084] In this way, in the water-stopping material 47 having a partition wall portion 51 provided in the hollow portion 49, by adjusting the thickness of the partition wall portion 51, it becomes possible to easily control the contact pressure of the fin-shaped protrusion group when compressed and deformed from the opposing sealing surface 41, and the amount of deformation of the upper surface (recess 27).

[0085] As a result, by providing vertical partitions 51 in hollow 49, when compressive force is applied from adjacent opposing seal surfaces 41 across joint 13, greater stress is generated on side 25 than in a structure without partitions 51, improving watertightness. In addition, providing partition 51 in the center of hollow 49 prevents recess 27 on the top surface from extending too far upward. Furthermore, partition 51 supports the recess of recess 27. This prevents the flat top surface from protruding or sinking from inner surface 19 of U-shaped frame 17.

[0086] It should be noted that the partition wall 51 is not an essential structural part of the waterstop material 47. The partition wall 51 may be omitted from the waterstop material 47 if the optimum value can be found by adjusting the thickness of each part of the waterstop material main body 37. Even if the waterstop material 47 has a structure without the partition wall 51, it is possible to optimally control the contact pressure of the fin-like projections during deformation and the amount of deformation of the recesses 27. In other words, the partition wall 51 can be said to be a structural part that easily achieves these controls.

[0087] In this water-stopping material 47, a protruding corner portion 55 that protrudes inward at the position of the constricted portion 31 is formed in the left and right hollow half portions 53 divided by the partition portion 51. In the water-stopping material main body portion 37, the constricted portion 31 is formed between the corner portion 23 and the convex side surface 29. The constricted portion 31 can impart a structure to the outer shape that exhibits good sealing performance.

[0088] On the other hand, if the thickness of the constricted portion 31 is extremely thin compared to other portions, the constricted portion 31 becomes weak when subjected to compressive force from the opposing seal surface 41, and is subject to significant deformation due to stress concentration. This makes it difficult for the recess 27 to form a flat surface, and makes it impossible to generate an appropriate repulsive force in the fin-shaped projections.

[0089] Therefore, by forming a corner portion 55 that protrudes inward at the position of the constricted portion 31, the water-stopping material 47 is given an external shape that exhibits good sealing performance, while preventing the constricted portion 31 from becoming a weak portion, making it easy to generate an appropriate repulsive force in the fin-shaped projection group.

[0090] As a result, a corner portion 55 that protrudes inward is formed at the position of the constricted portion 31, so that the thickness increases at the position of the constricted portion 31, and when a compressive force is applied from the opposing seal surface 41, the constricted portion 31 is excessively deformed, the repulsive force of the fin-shaped projections 33 is reduced, and the deterioration of water-stopping properties is suppressed.

[0091] It should be noted that the protruding corner portions 55 are not essential structural parts of the waterstop material 47. The waterstop material 47 may omit the protruding corner portions 55 if the optimum value can be found by adjusting the thickness of each part of the waterstop material main body 37. Even if the waterstop material 47 has a structure without the protruding corner portions 55, it is possible to optimally control the contact pressure of the fin-like projections during deformation and the amount of deformation of the recesses 27. In other words, the protruding corner portions 55 can be said to be a structural part that easily achieves these controls.

[0092] Furthermore, in this water-stopping material 47, a protruding portion 57 with a semicircular cross section that protrudes outward is formed in the constricted portion 31. Because the water-stopping material 47 has the protruding portion 57 provided in the constricted portion 31, when the water-stopping material 47 is packed into the joint 13, the protruding portion 57 receives a reaction force from the opposing seal surface 41. Therefore, the water-stopping material 47 can obtain a higher contact pressure with the opposing seal surface 41 than when the protruding portion 57 is not provided.

[0093] Furthermore, since the protruding portions 57 of the water-stopping material 47 are symmetrically arranged on the left and right constricted portions 31, the reaction force received from the opposing seal surface 41 acts equally on the left and right. Also, by making the protruding length of the protruding portions 57 slightly shorter than the protruding length of the fin-shaped projection group, it is possible to reduce the excessive reaction force acting on the fin-shaped projection group from the opposing seal surface 41. In other words, the water-stopping material 47 can generate a large contact pressure against the opposing seal surface 41 while generating an optimal contact pressure on the fin-shaped projection group.

[0094] As a result, protrusions 57 that protrude outward from side surface 25 are provided in constricted portion 31, which provides high contact pressure with opposing seal surface 41 and improves watertightness. In addition, the reaction force of protrusions 57 tends to make the gap between opposing seal surface 41 and side surface 25 equal on the left and right, suppressing uneven contact pressure and uneven deformation applied to fin-like protrusions 33 and preventing a decrease in watertightness due to fin-like protrusions 33.

[0095] It should be noted that the protrusions 57 are not an essential structural part of the waterstop material 47. The protrusions 57 may be omitted from the waterstop material 47 if the optimum value can be found by adjusting the thickness of each part of the waterstop material main body 37. Even if the waterstop material 47 has a structure without the protrusions 57, it is possible to optimally control the contact pressure of the fin-like projections during deformation and the amount of deformation of the recesses 27. In other words, the protrusions 57 can be said to be a structural part that easily achieves these controls.

[0096] In the joint structure of this waterway 15, the left and right fin-shaped protrusions 33 of the water-stopping material 47 contact the opposing sealing surfaces 41 of the U-shaped frame 17 that sandwich the joint 13, and the water-stopping material 47 is compressed and deformed, so that the recess 27 is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17.

[0097] In addition, by forming the partition wall 51 in the water-stopping material 47, the partition wall 51 acts as a pillar connecting the bottom 39 and the lower part of the upper surface. In this joint structure, when a compressive force is applied from the opposing seal surface 41, a large stress is generated in the side surface 25, compared to a structure in which the hollow portion 49 of the water-stopping material 47 does not have the partition wall 51.

[0098] Therefore, in this joint structure, by adjusting the thickness of the partition wall 51, it is possible to easily control the contact pressure of the fin-like projections and the amount of deformation of the upper surface (recess 27) when they are compressed and deformed from the opposing seal surface 41. As a result, by providing the vertical partition wall 51 in the hollow portion 49, a large stress is generated on the side surface 25, improving watertightness, while eliminating the need for additional processes such as installing a resin foam material, injecting a filler material, and smoothing the surface, thereby simplifying the process, shortening the construction period, reducing the number of parts, and reducing costs.

[0099] In addition, in the joint structure of this water channel 15, the left and right fin-shaped protrusions 33 of the water-stopping material 47 each come into contact with the opposing sealing surfaces 41 of the U-shaped frame 17 that sandwich the joint 13, and the water-stopping material 47 is compressed and deformed, so that the recess 27 is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17.

[0100] In addition, the water-stopping material 47 of this joint structure has a projecting corner portion 55 that projects inward at the position of the constricted portion 31.

[0101] Therefore, in this joint structure, by forming the projecting corner portion 55 in the water-stopping material 47, it is possible to easily generate an appropriate repulsive force in the fin-like projections while imparting an external shape that exhibits good sealing performance. As a result, because the projecting corner portion 55 is formed at the position of the constricted portion 31, a decrease in water-stopping performance is suppressed, and additional processes such as installing a resin foam material, injecting a filler material, and smoothing the surface are not required, thereby simplifying the process, shortening the construction period, reducing the number of parts, and reducing costs.

[0102] In addition, in the joint structure of this water channel 15, the left and right fin-shaped protrusions 33 of the water-stopping material 47 each come into contact with the opposing sealing surfaces 41 of the U-shaped frame 17 that sandwich the joint 13, and the water-stopping material 47 is compressed and deformed, so that the recess 27 is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17.

[0103] In addition, the water-stopping material 47 with this joint structure has a protruding portion 57 formed at the constricted portion 31 that protrudes outward and has a semicircular cross section.

[0104] Therefore, with this joint structure, a higher contact pressure can be obtained with the opposing seal surface 41 than when the water-stopping material 47 does not have the protrusion 57, and it is possible to generate an optimal contact pressure on the fin-like projection group while generating a large contact pressure with the opposing seal surface 41. As a result, by providing the protrusion 57 that protrudes outward from the side surface 25 in the constricted portion 31, a high contact pressure is obtained and water-stopping properties are improved, while additional processes such as installing a resin foam material, injecting a filler material, and smoothing the surface are not required, thereby simplifying the process, shortening the construction period, reducing the number of parts, and reducing costs.

[0105] As described above in detail, with the waterstop materials 11 and 47 according to this embodiment, when the waterstop materials 11 and 47 are compressed and deformed, the recesses 27 on the upper surface are exposed as a flat surface that is continuous with the joints 13, eliminating the need for additional processes such as installing a resin foam material, injecting a filler, and smoothing the surface, simplifying the process and achieving shorter construction time, fewer parts, and lower costs. In addition, because the joints 13 form a flat surface, damage to the waterstop materials 11 and 47 due to water flow and the occurrence of waterway fouling can be suppressed.

[0106] Furthermore, with the joint structure of the water channel 15 according to this embodiment, the waterstop materials 11 and 47, which have recesses 27 on their upper surfaces, are compressed and deformed, causing the recesses 27 to become flat and continuous with the inner surface 19 of the U-shaped frame 17, and the fin-like projections 33 come into contact with the opposing seal surface 41 of the U-shaped frame 17. This prevents damage to the waterstop materials 11 and 47 caused by water flow and the occurrence of water channel fouling, while eliminating the need for additional processes such as installing a resin foam material, injecting filler, and smoothing the surface. This simplifies the process, shortens construction time, reduces the number of parts, and reduces costs. Furthermore, if a water-swelling material is used for the fin-like projections 33, the increased volume allows them to be tightly fitted to the opposing seal surface 41 with strong pressure, achieving high waterstop performance.

[0107] Furthermore, according to the joint construction method for the water channel 15 of this embodiment, the water-stopping materials 11 and 47, whose cross-sectional shape perpendicular to the longitudinal direction has a vertically long hollow portion 49 and has a recess 27 on their upper surface, are compressed and deformed within the width of the joint 13 between adjacent U-shaped frames, so that the recess 27 is exposed as a flat surface that is continuous with the inner surface 19 of the U-shaped frame 17.This eliminates the need for additional processes such as installing resin foam material, injecting filler material, and smoothing the surface, thereby simplifying the process, shortening the construction period, reducing the number of parts, and reducing costs. [Explanation of symbols]

[0108] 11...Waterproof material 13...Joint 15...Waterway 17...U-shaped frame 19...Inside 21...Hollow part 23...Corner 25...Side 27...recess 29…Convex side 31...Constricted part 33...fin-like protrusion 41...opposing seal surface 47...Waterproof material 49...Hollow part 51...Partition wall part 53...Hollow half part 55...Outer corner 57...Protrusion

Claims

1. A water-stopping material formed in a long length, The cross-sectional shape perpendicular to the longitudinal direction is formed in a tubular shape having a vertically long hollow portion and side surfaces via corners on both the left and right sides of the upper surface, the upper surface is formed with a recess; The side surface has a curved convex side surface and a constricted portion between the corner portion and the convex side surface, A plurality of fin-shaped protrusions are formed on the left and right convex side surfaces at intervals in the vertical direction, A water-stopping material characterized in that the fin-like projections are inclined upward as they approach the top.

2. 2. The waterproof material according to claim 1, wherein at least one of the fin-shaped projections is made of a water-swellable material.

3. 3. The waterproof material according to claim 1, wherein a vertical partition wall is formed in the hollow portion to divide the hollow portion into left and right portions.

4. 4. The waterproof material according to claim 3, wherein the left and right hollow halves divided by the partition wall have corners that protrude inward at the positions of the constricted portions.

5. 5. The waterproof material according to claim 4, wherein a protruding portion having a semicircular cross section protruding outward is formed in the constricted portion.

6. A waterway joint structure in which the joints between U-shaped frames are sealed by the waterstop material according to claim 1 or 2, A waterway joint structure characterized in that the left and right fin-shaped protrusions of the water-stopping material contact the opposing sealing surfaces of the left and right U-shaped frames that sandwich the joint, and the water-stopping material sandwiched between the left and right opposing sealing surfaces is compressed and deformed, so that the recessed portion on the upper surface is exposed as a flat surface that is continuous with the inner surface of the U-shaped frame.

7. 7. The waterway joint structure according to claim 6, wherein the joints between the U-shaped frames are sealed by the water-stopping material according to claim 3.

8. 7. The waterway joint structure according to claim 6, wherein the joints between the U-shaped frames are sealed by the water-stopping material according to claim 4.

9. The waterway joint structure according to claim 6, wherein the joints between the U-shaped frames are sealed by the water-stopping material according to claim 5.

10. A waterway joint construction method in which the joints of a waterway formed by connecting U-shaped frames are sealed with a long waterstop material, The water-stopping material has a cross-sectional shape perpendicular to the longitudinal direction, which has a vertically elongated hollow portion and a recessed portion on the upper surface, A method for constructing joints in waterways, characterized in that the water-stopping material is compressed and deformed within the width of the joint, so that the recess on the upper surface is exposed as a flat surface continuous with the inner surface of the U-shaped frame.

Images