JP2021116638A - Flexible water cut-off joint - Google Patents

Abstract

To provide a flexible cut-off joint that can allow for a large relative movement between structure elements and has less unevenness on the surface side.SOLUTION: A flexible cut-off joint 20 has a folded part 21a protruding toward the back side in a middle part of a main body part 21, and is fixed to each of structure elements 1A and 1B near both ends in the width direction. The folded part 21a is housed in a storage space 6 having a V-shaped cross section formed by facing inclined surfaces 4A and 4B. When the structure elements 1A and 1B are separated due to ground movement, the adhesive state of a temporary fixed part 21b of the main body part 21 is released, and the folded part 21a is expanded, thereby preventing water leakage by reliably stopping water between the structure elements 1A and 1B. It can handle a larger separation amount of the structure elements 1A and 1B than before since the folded part 21a allows for a larger stretchable amount. The surface side of the main body part is less uneven, so it does not interfere with the flow of wastewater.SELECTED DRAWING: Figure 3

Description

The present invention relates to a flexible waterproof joint that is fixed across adjacent structural elements in a structure constructed by connecting a plurality of structural elements.

Patent Document 1 describes a flexible rubber joint that is suitable as a joint for connecting portions of a plurality of boxes when constructing an excavation tunnel using a box that partitions an underground space. The flexible rubber joint includes a pair of metal frames and a waterproof rubber member erected between the frames. The pair of metal frames is composed of a set of metal flat plates arranged so as to be inclined with respect to the wall of the underground space, whereby a mounting groove having a substantially V-shaped cross section is formed. The waterproof rubber member is formed by integrally forming a waterproof rubber main body having a substantially inverted U-shaped cross section and a pair of flange portions extending from the base portion of the waterproof rubber main body toward the top side.

Patent Document 2 describes that when constructing a concrete underground structure such as water and sewage by connecting a plurality of structure elements having a unit block of a predetermined size, the structure elements are watertightly connected to each other. The connection structure of is described. In this connection structure, a mounting step surface is formed by a frame on the inner peripheral side of the connecting end face of each structural element, and a flexible water blocking member formed of an elastic body is watertightly straddled between adjacent mounting step surfaces. The joint material is filled and arranged between the joint end faces. With this configuration, the structural elements are watertightly coupled via a flexible water blocking member, and their flexibility allows relative displacement.

Patent Document 3 describes a flexible waterproof joint arranged at a connecting portion between box culverts when a gutter pipe for water intake / drainage using a river is constructed by connecting box culverts made of precast concrete. Has been done. This flexible waterproof joint is formed in a short tubular shape with a flexible material such as rubber or synthetic resin, and has a stretchable portion folded in the inner central portion in the cross-sectional direction. Mounting portions are formed at both ends thereof. Then, it is attached between the box culverts by using the anchor bolts embedded in the stepped portion formed at the inner peripheral end portion on the adjacent side of the continuous box culverts.

Japanese Unexamined Patent Publication No. 2001-164590 Japanese Unexamined Patent Publication No. 2004-346592 Japanese Unexamined Patent Publication No. 2013-11060

The techniques described in Patent Documents 1 to 3 relate to a joint structure for stopping water at a connecting portion between adjacent structural elements, and all of them have a relatively complicated shape with many irregularities on the surface side of the joint member. Therefore, for example, when applied to a sewer pipe, drainage and dust may accumulate and accumulate in the joint portion, increasing the flow resistance and lowering the drainage efficiency.

Further, the joint described in Patent Documents 1 and 2 is provided with a U-shaped bulging portion in the intermediate portion, and can be extended in accordance with the expansion of the interval between adjacent structures due to ground movement or the like. It is configured as. However, in the techniques of Patent Documents 1 and 2, it cannot be said that a sufficient amount of extension is given to the joint member, and it is difficult to cope with a large fluctuation such as unequal settlement.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a flexible waterproof joint which can cope with a large relative movement between structures and has a small uneven shape on the surface side.

In order to achieve the above object, the invention according to claim 1 is a flexible water blocking device that is fixed across adjacent structural elements in a structure constructed by connecting a plurality of structural elements. A flexible water-stopping joint is a main body portion made of a sheet-like member having water-stopping and flexibility, and having a folded portion folded so as to project to one side in the middle portion in the width direction thereof. And a fixing member for fixing the main body to each of the adjacent structural elements in the vicinity of both ends in the width direction, and the adjacent structural elements are provided with inclined surfaces at the peripheral edges of the end faces facing each other. A groove-shaped storage space is formed between adjacent structural elements by the opposing inclined surfaces, and the main body portion is arranged so that the folded portion is stored in the storage space, and the main body portion is adjacent to each other by a fixing member. It is fixed to each body element.

When configured in this way, the flexible waterproof joint covers the connecting portion between adjacent structural elements by the main body portion to prevent water leakage in this portion. Since the folded portion of the main body portion is stored in the storage space formed between the adjacent structural elements, the other surface of the main body portion that does not face the structural element can be flattened.

The invention according to claim 2 is the configuration of the invention according to claim 1, wherein the structure element further includes a stepped portion between the inner wall surface and the inclined surface thereof, and the main body portion is provided with a fixing means at the stepped portion. It is fixed to the structure element.

With this configuration, the main body of the flexible waterproof joint is fixed at a position recessed from the inner wall surface of the structural element.

The invention according to claim 3 further includes a pressing member that covers at least a part of the folded portion on the other surface side of the main body portion in the configuration of the invention according to claim 1 or 2.

With this configuration, the pressing member covers at least a part of the folded portion of the main body from the other side.

The invention according to claim 4 is the configuration of the invention according to any one of claims 1 to 3, wherein the folding portion provides a temporary fixing means for maintaining the folded state until the adjacent structural elements move relative to each other. To prepare.

With this configuration, the folded portion is maintained in the folded state by the temporary fixing means until the adjacent structural elements move relative to each other.

The invention according to claim 5 further includes a formwork covering a surface extending from a part of an end face of a structural element to a part of an inner wall surface in the configuration of the invention according to any one of claims 1 to 4. The main body is arranged on the surface of the mold.

With this configuration, the formwork forms a surface portion from a portion of the end face of the structure element through an inclined surface to a portion of the inner wall surface.

As described above, according to the first aspect of the present invention, since the folding portion is provided in the middle portion of the main body portion of the flexible water blocking joint, the main body portion moves with respect to the relative movement between adjacent structural elements. It can be followed and deployed. Therefore, even if separation or uneven settlement occurs between adjacent structural elements, the water stopping property of the flexible water blocking joint is not impaired. The folded part of the main body can be stored in the storage space, and the opposite side can be flattened. Therefore, when the structure is used as a sewer pipe, for example, the unevenness of the forming surface of the flow path is reduced, so that drainage and dust retention can be reduced. Since the inclined surface for forming the storage space is provided, when the structural element is cast with concrete, it becomes difficult for air to stay on the inclined surface portion, so that the area where the air pool is generated is reduced.

The invention according to claim 2 has the effect of the invention according to claim 1 and can eliminate or reduce the portion protruding toward the inner wall surface side. Therefore, when the structure is used as a sewer pipe, for example, the drainage It is possible to suppress an increase in flow resistance.

In the invention according to claim 3, in addition to the effect of the invention according to claim 1 or 2, the restraining member suppresses the folded portion from protruding toward the other surface when the folded portion is deformed. Thereby, when the structure is used as a sewer pipe, for example, the flatness of the forming surface of the flow path can be maintained even when the relative movement occurs between the structure elements.

The invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, lowers the folding portion when fixing the main body portion of the flexible water blocking joint to the structural element. Since the folded state is maintained by the temporary fixing means and does not spread even when facing toward, the fixing work of the main body portion becomes easy.

In the invention according to claim 5, in addition to the effect of the invention according to any one of claims 1 to 4, the main body of the flexible waterproof joint is arranged on the surface of a highly smooth formwork. It is possible to improve the watertightness between the part and the formwork to ensure water stoppage. Since the formwork includes an inclined surface, the air generated when the structural elements are cast with concrete does not stay in the area of the inclined surface but moves upward. Since the region where the air stays on the back surface side of the formwork is a region other than the inclined surface, the air pool can be reduced and the risk of water leakage through the air pool can be reduced.

It is a perspective view which shows a part of the structure to which a flexible waterproof joint which concerns on this invention is applied. It is sectional drawing which shows a part of the structure to which the flexible waterproof joint which concerns on this invention is applied. It is sectional drawing which shows the installation state of the flexible water stop joint which concerns on this invention. It is sectional drawing which shows the deformation state of the flexible water stop joint which concerns on this invention when the adjacent structural element moves relative to each other in the separation direction. It is sectional drawing which shows the deformation state of the flexible water stop joint which concerns on this invention when unequal settlement occurs between adjacent structure elements. It is a figure explaining the advantage by providing the inclined surface at the peripheral edge of each end face of the adjacent structure element facing each other, (A) is related to this invention, (B) is about a comparative example. It is a thing. It is sectional drawing which shows the deformation state of the flexible water stop joint which concerns on this invention when the adjacent structural element moves relative to each other in the approaching direction. It is sectional drawing which shows the installation state of the flexible water stop joint by the different embodiment of this invention.

FIG. 1 is a perspective view showing a part of a structure to which the flexible waterproof joint according to the present invention is applied, and FIG. 2 is a part of a structure to which the flexible waterproof joint according to the present invention is applied. It is a cross-sectional view which shows, and FIG. 3 is a cross-sectional view which shows the installation state of the flexible water stop joint which concerns on this invention.

The structure S shown in FIGS. 1 and 2 is a sewer pipe constructed by using box culvert as the structure element 1A (1B) and connecting a plurality of them. The box culvert which is the structure element 1A (1B) is a square tubular body made of precast concrete, and the inner wall surface 2 thereof is a forming surface of a flow path through which drainage or the like flows. Further, in this example, a stepped portion 3 and an inclined surface 4 are formed between the inner wall surface 2 and the end surface 5.

In this example, as shown in FIG. 3, a part of the end surface 5A (5B) to one of the inner wall surfaces 2A (2B) is formed by the formwork 10A (10B) arranged at the end of the structure element 1A (1B). It was supposed to cover the surface over the part. That is, the mold 10A (10B) has a vertical portion 11A (11B), a horizontal portion 12A (12B), and an inclined portion 13A (13B) that are continuous from the inner wall surface 2A (2B), and these surfaces are stepped portions. It forms 3A (3B) and an inclined surface 4A (4B). The formwork 10A (10B) is made of a metal such as resin-coated steel, and functions as a molding die that forms a part of the structure element 1A (1B) on the end side when concrete is cast. Since the formwork 10A (10B) has the inclined portion 13A (13B), when the structure elements 1A (1B) are connected to construct the structure, the structures adjacent to each other by the opposing inclined surfaces 4A (4B). A storage space 6 having a V-shaped cross section is formed between the body elements 1A (1B). Further, the end faces 5A and 5B of the adjacent structural elements 1A and 1B are filled with a joint material 30 using a foamed resin, an asphalt bituminous material, or the like, and the two are watertightly closed.

In the formwork 10A (10B), holes (not shown) are formed at appropriate positions in the horizontal portion 12, and nut members 26A (26B) having screw holes are welded or the like on the back surface side of the positions where the holes are formed. Be attached. An anchor member 27A (27B) having a bent portion is connected to the nut member 26A (26B) by an appropriate means such as screwing or welding. A fixing bolt 23A (23B) is screwed into the screw hole of the nut member 26A (26B) through the opening of the horizontal portion 12A (12B). When concrete is cast using the formwork 10A (10B) in order to manufacture the structure element 1A (1B), the bent portion of the anchor member 27A (27B) embedded in the concrete exerts an anchoring effect. Prevents the formwork 10A (10B) from falling off from the structure element 1A (1B). A flow blocking material 50A (50B) for preventing the cast concrete from flowing out is arranged on the back surface side of the vertical portion 11A (11B) in the formwork 10A (10B).

The flexible waterproof joint 20 fixed across the adjacent structural elements 1A and 1B is made of a sheet-like member having water-stopping and flexibility, and is on one side (back surface) side in the middle portion in the width direction. It includes a main body portion 21 having a folded portion 21a folded so as to project to, and a fixing member for fixing the main body portion 21 to adjacent structural elements 1A and 1B in the vicinity of both ends in the width direction thereof.

The fixing member of this example is a fixing bolt 23A (23B) screwed into a nut member 26A (26B) fixed to the mold 10A (10B), and a folding portion on the other surface (surface) side of the main body portion 21. It is composed of a plate-shaped pressing member 25A (25B) having a length capable of covering at least a part of 21a. The fixing bolt 23A (23B) penetrates the washer 24A (24B) and the pressing member 25A (25B) arranged on the surface of the main body 21, and is screwed and tightened to the nut member 26A (26B) to tighten the main body. Each of the vicinity of both ends of the portion 21 is fixed to each of the structure elements 1A (1B). A gap is formed between the opposing pressing members 25A and 25B. The dimension of this gap is set to be equal to or greater than the distance between the end faces 5A and 5B of the adjacent structure elements 1A and 1B. As a result, it is possible to prevent the pressing members 25A and 25B from colliding with each other when the structure elements 1A and 1B are displaced in the approaching direction.

The main body 21 is composed of a sheet-like member having water-stopping property and flexibility, and for example, a sheet material having a structure in which high-strength fibers are embedded inside a rubber sheet is used. In the sheet-like member having such a structure, the rubber material exhibits water impermeability, chemical resistance and weather resistance, and the high-strength fiber exhibits excellent tensile strength, so that it is physically and chemically stable. Therefore, it is suitable as a water blocking member between structural elements constituting a sewer pipe or the like. In this example, the main body portion 21 has a folded portion 21a formed by folding back the intermediate portion twice. The folded portion 21a is formed in a folded state so as to project toward one surface side (back surface side) of the main body portion 21. Therefore, the folded portion 21a is stored in the storage space 6 having a V-shaped cross section formed between the adjacent structural elements 1A (1B) in the mounted state of the main body portion 21. The folded portion 21a is provided with a temporary fixing means capable of maintaining the folded state in a natural state. This is, for example, a temporary fixing portion 21b in which the portions of the folded portion 21a where the surfaces of the main body portions 21 are in contact with each other are bonded to each other by, for example, hot melt. The temporary fixing portion 21b is adhered with a relatively weak adhesive force that maintains the folded state in the natural state and is easily separated when an external force in the extension direction acts on the main body portion 21. Therefore, when a position displacement in the separation direction occurs between the structure elements 1A and 1B and the main body portion 21 is pulled in the extension direction, the temporary fixing portion 21b is separated and the folding portion 21a is separated so as to follow this position displacement. Expands. The number of folds and the fold width of the folded portion 21a are set based on the predicted positional displacement between the structure elements 1A and 1B.

Further, the main body 21 is formed with an opening (not shown) through which the fixing bolt 23A (23B) is inserted, and an annular convex portion 21c surrounding the perimeter of the opening is formed. The annular convex portion 21c abuts on the surface of the mold 10A (10B) to improve the water stopping property around the opening.

Further, in this example, the protective sheet 22 is laminated on the surface side of the main body 21. The protective sheet 22 is thinner than the main body 21 and can be easily stretched elastically. For example, a synthetic resin such as rubber or polyethylene, or a rubber having a reinforcing material such as a fiber embedded therein or the like. It is made of a material such as synthetic resin.

The installation procedure of the flexible waterproof joint 20 configured as described above will be described below. With reference to FIG. 3, the structure elements 1A and 1B for constructing the structure are known methods such as, for example, a structure in which round bar-shaped steel materials (not shown) arranged in advance in the concrete skeleton are connected to each other. Connected by. The space between the adjacent structural elements 1A and 1B is filled with the joint material 30. The flexible water blocking joint 20 is arranged on the surfaces of the opposing formwork 10A and 10B in a posture in which the main body portion 21 of the flexible water blocking joint 20 is housed in the storage space 6 of the folding portion 21a. At this time, even if the folded portion 21a is directed vertically downward, the folded state is maintained by the temporary fixing portion 21b and does not unfold, so that the construction work can be smoothly performed.

A protective sheet 22 is laminated on the main body 21 (front surface side). Further, the seal packing 40A (40B) is arranged along the edge portion of the main body portion 21. Then, after arranging the pressing member 25A (25B) and the washer 24A (24B) on the protective sheet 22, the fixing bolt 23A (23B) is attached to the washer 24A (24B), the pressing member 25A (25B), and the protective sheet 22. , The main body 21 and the mold 10A (10B) are inserted, screwed into the nut member 26A (26B), and tightened. As a result, the main body 21 is sandwiched between the formwork 10A (10B) and the pressing member 25A (25B) and fixed to each of the structure elements 1A (1B). Since the main body 21, the mold 10A (10B), and the pressing member 25A (25B) are in close contact with each other on a flat surface, excellent water stopping performance can be exhibited.

When the structure is a sewer pipe, the flexible waterproof joint configured in this way covers the connecting portion between the structure elements and prevents the drainage flowing in the pipe from leaking to the outside. Since the surface side of the main body facing the flow path has a shape with few irregularities, it is difficult for drainage and dust to stay, and there is little risk of impeding the fluidity of the drainage. Since the folded portion is formed by folding the main body portion in a direction parallel to the surface thereof, the thickness of the main body portion can be made relatively thin. Therefore, the height of the storage space for accommodating the folded portion can be lowered, and the height dimension of the form itself can be reduced to reduce the size. If the formwork can be miniaturized, the interference between the formwork and the reinforcing bars when the structural elements are made of concrete is reduced, so that the degree of freedom in designing the skeleton is improved and the work of arranging the reinforcing bars is facilitated. In addition, the miniaturization of the formwork facilitates the vibrator treatment of the placed concrete.

In this example, the following advantages can be obtained by having the mold having an inclined surface portion. The formwork functions as a part of the molding mold when concrete is cast to manufacture the structural elements, but at that time, air bubbles generated in the concrete are difficult to stay on the inclined part, so that an air pool is created. Can be reduced. Since the cast concrete easily flows into the inclined portion, the concrete is easily filled on the back surface side of the formwork, and it is less likely that an air pool is generated. Further, the weight of the mold can be reduced as compared with the case where the storage space for accommodating the folded portion is formed in a concave groove shape.

Furthermore, since the formwork of this example has a stepped portion, the flexible water blocking joint does not protrude from the inner wall surface of the structural element, so that the fluidity of drainage can be kept good.

FIG. 4 is a cross-sectional view showing a deformation state of the flexible water blocking joint according to the present invention when adjacent structural elements move relative to each other in the separation direction.

With reference to FIG. 4, when the positions of adjacent structural elements 1A and 1B are displaced relative to each other in the separation direction due to ground movement or the like and the distance between the two is widened, the main body 21 of the flexible water blocking joint 20 is subjected to. A pulling force in the stretching direction acts. As a result, the adhesive state of the temporarily fixed portion 21b is released, and the folded portion 21a can be unfolded. Further, the protective sheet 22 can be stretched due to its elasticity. Therefore, since the main body portion 21 can expand the folded portion 21a following the separation of the structure elements 1A and 1B, even if a gap is formed between the structure elements 1A and 1B, the space between the two can be ensured. It is possible to stop water and prevent water leakage. Further, in this example, since the amount of folding back at the folded portion 21a can be sufficiently secured and the amount of extendability can be increased, it is possible to cope with a larger amount of separation of the structure elements 1A and 1B than in the conventional case. Since the folded portion 21a has a form with less unevenness on the surface side and the flatness on the surface side is maintained by the protective sheet 22, even if the structure elements 1A and 1B are separated, the fluidity of drainage is hindered. Do not give.

FIG. 5 is a cross-sectional view showing a deformation state of the flexible water blocking joint according to the present invention when unequal settlement occurs between adjacent structural elements.

With reference to FIG. 5, when the relative positions of adjacent structural elements 1A and 1B are displaced in the vertical direction due to uneven subsidence of the ground, a vertical displacement force is applied to the main body 21 of the flexible water blocking joint 20. Works. As a result, when the folded portion 21a is deformed and the amount of displacement in the vertical direction is large, the adhesive state of the temporarily fixed portion 21b is released, and the folded portion 21a can be unfolded. At this time, the surface side of the folded portion 21a of the main body portion 21 is covered with the pressing members 25A and 25B to prevent the folded portion 21a from protruding toward the surface side, so that it is possible to avoid complicating the surface shape. At this time, the protective sheet 22 can follow and deform due to its elasticity. Therefore, since the main body portion 21 can deform and unfold the folded portion 21a following the positional displacement of the structural elements 1A and 1B, even if a large positional displacement occurs between the structural elements 1A and 1B, the folding portion 21a can be deformed and unfolded. Water can be reliably stopped between the two to prevent water leakage. Further, since the extendable amount can be increased by the folding portion 21a, it is possible to cope with the positional displacement of the structural elements 1A and 1B larger than those in the conventional case. Further, the protective sheet 22 avoids the complication of the surface side shape and prevents the fluidity of the wastewater from being significantly impaired.

6A and 6B are views for explaining the advantages of providing an inclined surface on the peripheral edge of each end surface of adjacent structural elements facing each other, in which FIG. 6A relates to the present invention and FIG. 6B shows the present invention. Is a comparative example. That is, FIG. 6A shows a case where inclined surfaces 4A and 4B are formed on the peripheral edges of the opposite end faces 5A and 5B of the structure elements 1A and 1B, and FIG. 6B shows a structure. The case where the opposite end faces 5C and 5D of the elements 1C and 1D are formed only by the vertical plane is shown. In FIG. 6, only the configuration necessary for the explanation is shown in a simplified manner.

The advantages of having a structure element with an inclined surface portion are as follows. With reference to FIG. 6, it is assumed that unequal subsidence occurs between adjacent structural elements and the main body 21 of the flexible water blocking joint 20 is fully extended. It is assumed that the lengths of the main body 21 are the same in (A) and (B), and the horizontal distance between the fixing positions by the fixing bolts 23A and 23B is also the same. In (A), when unequal subsidence occurs between the adjacent structural elements 1A and 1B, the main body 21 bends and extends so as to pass through the storage space 6 formed between the inclined surfaces 4A and 4B. be able to. On the other hand, in (B), the main body portion 21 is extended in a bent state at the position of the corner portion of the structure element 1C which is located above the subsidence. Comparing the two, the subsidence amount L1 in (A) when the main body 21 is in the fully extended state may be larger than the subsidence amount L2 in (B) when the main body 21 is in the same state. Understood. That is, it can be said that the amount of subsidence that the flexible waterproof joint can handle can be increased by forming an inclined surface for each of the adjacent structural elements as in this example. From another point of view, the maximum length of the flexible waterproof joint (extended state) required to cope with a predetermined amount of subsidence by forming an inclined surface for each of adjacent structural elements. It can also be said that the length) can be shortened.

FIG. 7 is a cross-sectional view showing a deformation state of the flexible water blocking joint according to the present invention when the adjacent structural elements move relative to each other in the approaching direction.

With reference to FIG. 7, when the adjacent structural elements 1A and 1B are relatively displaced in the approaching direction due to the ground movement, a force in the compression direction acts on the main body 21 of the flexible water blocking joint 20. As a result, the folded portion 21a is deformed so as to expand its diameter. At this time, the surface side of the folded portion 21a of the main body portion 21 is covered with the pressing members 25A and 25B to prevent the folded portion 21a from protruding toward the surface side, so that it is possible to avoid complicating the surface shape. However, the protective sheet 22 is deformed so as to bulge toward the surface side due to its elasticity, but the influence is considered to be small. Even if the structure elements 1A and 1B are displaced in the approaching direction in this way, the main body 21 can deform the folded portion 21a so as to follow the position, so that the structure elements 1A and 1B can be reliably stopped. Water can be used to prevent water leakage.

However, if the structural elements 1A and 1B are excessively close to each other, the joint material 30 arranged between the end faces 5A and 5B is strongly compressed, and the reaction force may damage the end faces 5A and 5B. .. However, in this example, inclined surfaces 4A and 4B are formed between the end faces 5A and 5B and the positions of the fixing bolts 23A (23B) and the nut members 26A (26B) fixing the main body 21. The inclined surfaces 4A and 4B never come into contact with each other even if the structural elements 1A and 1B approach each other. Therefore, even if a large compressive force that damages the end faces 5A and 5B due to the approach of the structural elements 1A and 1B acts, the influence is affected by the fixing bolt 23A (23B) and the nut member 26A (26B). Since there is no possibility of reaching the position of, the water stopping performance of the flexible water blocking joint 20 is not impaired. That is, water leakage can be reliably prevented even with respect to the positional displacement of the structural elements 1A and 1B in the approaching direction.

FIG. 8 is a cross-sectional view showing an installation state of a flexible waterproof joint according to a different embodiment of the present invention.

As long as the shape of the folded portion of the flexible waterproof joint is such that it projects toward one side (back surface) side of the main body portion, the folding direction can be appropriately changed. The flexible waterproof joint 200 shown in FIG. 8 is formed by folding back a plurality of main body portions 21 in the direction from the front surface side to the back surface side in the middle of the main body portion 21 to form a folded portion 21d. Also in this example, the surface side of the main body 21 has a shape with few irregularities. Further, by providing the temporary fixing portion 21e, the folded state of the folded portion 21d is maintained in the natural state, and when a tensile force acts on the main body portion 21, the folded portion 21d can be expanded and expanded. ..

In the above-described embodiment, the pressing member is arranged on the surface side of the main body, but this may be omitted. Further, the temporary fixing portion of the folded portion of the main body portion may be omitted.

Although the mold is provided with an inclined portion, this portion may be a curved surface having a curved cross section. Further, the stepped portion of the formwork may be omitted. Further, the formwork may be removed after the structural elements are cast with concrete.

Further, the present invention can be applied to a structure made of synthetic resin or metal in addition to the structure made of concrete.

S ... structure 1A, 1B ... structure element 2, 2A, 2B ... inner wall surface 3, 3A, 3B ... stepped portion 4, 4A, 4B ... inclined surface 5, 5A, 5B ... end surface 6 ... storage space 10, 10A, 10B ... Mold 11A, 11B ... Vertical part 12A, 12B ... Horizontal part 13A, 13B ... Inclined part 20,200 ... Flexible waterproof joint 21 ... Main body part 21a, 21d ... Folding part 21b, 21e ... Temporary fixing part 21c ... Convex part 22 ... Protective sheet 23A, 23B ... Fixing bolt 24A, 24B ... Washer 25A, 25B ... Holding member 26A, 26B ... Nut member 27A, 27B ... Anchor member 30 ... Joint material 40A, 40B ... Seal packing 50A, 50B ... Flow blocking material The same reference numerals in each figure indicate the same or corresponding parts.

Claims (5)

In a structure constructed by connecting a plurality of structural elements, it is a flexible water blocking joint that is fixed across the adjacent structural elements.
The flexible water-stopping joint is composed of a sheet-like member having water-stopping and flexibility, and has a main body portion having a folded portion folded so as to project to one side in an intermediate portion in the width direction thereof, and the main body. Includes fixing members that secure the portions to each of the adjacent structural elements near both ends in the width direction.
The adjacent structural elements are provided with inclined surfaces at the peripheral edges of their respective end faces facing each other, and the opposing inclined surfaces form a groove-shaped storage space between the adjacent structural elements.
The main body is a flexible waterproof joint that is fixed to each of the adjacent structural elements by the fixing member in a state where the folded portion is arranged so as to be housed in the storage space. The structural element is further provided with a stepped portion between its inner wall surface and the inclined surface.
The flexible waterproof joint according to claim 1, wherein the main body portion is fixed to the structure element by the fixing means at the step portion. The flexible waterproof joint according to claim 1 or 2, wherein the fixing member further includes a pressing member that covers at least a part of the folded portion on the other surface side of the main body portion. The flexible waterproof joint according to any one of claims 1 to 3, wherein the folded portion includes a temporary fixing means for maintaining a folded state until the adjacent structural elements move relative to each other. Any of claims 1 to 4, further comprising a formwork covering the surface of the structure element from a part of the end face to a part of the inner wall surface, and the main body portion is arranged on the surface of the formwork. Flexible waterproof joint described in Crab.

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