JP4780739B2 - Joint structure of secondary concrete products - Google Patents

Description

[0001]
[Field of the Invention]
The present invention mainly connects secondary concrete products used mainly for drainage of rainwater and sewage. Fitting Concerning structure.
[0002]
[Background Art and Problems to be Solved by the Invention]
Due to the development of manufacturing technology for concrete secondary products, concrete secondary products are often used for laying drainage gutters on roads. Most of such concrete secondary products are standard products, and their shapes are linear. Moreover, when laying using a concrete secondary product, it is necessary to connect each concrete secondary product.
[0003]
As a member for connecting a concrete secondary product, for example, there is a ring-shaped seal joint disclosed in Japanese Utility Model Publication No. 4-4595. As shown in FIG. 7, the seal joint 101 is made of an elastic member and is inserted between two concrete buried pipe blocks 105 and 106 to perform a sealing function. Further, since the seal joint 101 is provided with a loop 103a positioned between the end faces of the buried pipe blocks 105 and 106, the loop 103a can be flexibly flexible even if the runout between the buried pipe blocks 105 and 106 occurs. Follow and maintain watertightness.
[0004]
However, the road is not necessarily straight, and, for example, in a curved portion such as an intersection, drainage side grooves and the like are laid in a curved manner. In this case, in the ring-shaped seal joint shown in FIG. 7, even if the central crossing angle between the straight concrete blocks 105 and 106 is set to other than 180 °, the expansion and contraction in the lateral direction 107 by the expansion loop 103a is limited. There is. Further, since the expansion loop 103a has the plate-like core member 102 therein, the expansion loop 103a can hardly be bent and cannot be laid on a curved path.
[0005]
Therefore, when laying a straight concrete block along a curved path, a plurality of straight concrete blocks are connected along the path, and a paper tube or vinyl chloride is provided between the opposing end surfaces of the blocks which are inclined. A method has been adopted in which a flat plate such as a tube or a veneer plate is formed into a cylindrical shape and inserted between blocks, and concrete is placed and connected from above. However, this method has a problem in workability, workability, flow path surface smoothness, and securing of a cross-sectional shape because concrete must be placed in a narrow work place.
[0006]
From the above, the present invention is suitable for laying a straight concrete secondary product on a curved portion. Fitting The purpose is to provide a structure.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the joint structure of the concrete secondary product of the present invention is a concrete secondary product in which a large number of the joint structures are arranged along the flow path direction and the flow path is formed by the concrete wall. In the joint structure of a secondary concrete product in which a ring-shaped joint having flexibility is interposed at the joint of the joint, the joint is a recess parallel to the end surface from the inner surface side which is the flow path surface side of the end surface of the concrete wall. An insertion part is provided, and a small wall is formed continuously from the bottom side of the recess part so that the inner surface side of the concrete wall is positioned outside the radial direction of the concrete secondary product. A groove is formed on the inner surface side at a position away from the end surface, while the joint follows a crossing angle between the flow path center lines of adjacent concrete secondary products and has a width (W) in the circumferential direction. Engage with the belt part that can expand and contract along the circumferential direction in which the dimension ratio H / W to the height (H) in the radial direction is in the range of 0.1 to 0.5, and both ends of the belt part The end from which the protrusion is provided and the band from the outer peripheral surface side in contact with the concrete secondary product at the end. The recessed portion is a storage portion that can store the band portion, and the small wall is a flow path in which the tip end portion of the fin is in contact and curved and closely contacts A watertight portion for preventing leakage of liquid flowing through the groove, and the groove is characterized by a joint structure of a concrete secondary product in which the engagement protrusions on both ends are engaged and pressed through a water stop material. To do.
[0008]
According to the joint structure of the secondary concrete product of the present invention, the width dimension in the circumferential direction can be changed following the crossing angle between the flow path center lines of adjacent concrete secondary products, so the crossing angle is 180 °. It is also possible to easily lay a straight concrete secondary product on a curved portion of a road other than the above.
[0009]
Here, “flexibility” refers to a property that can be flexibly deformed.
The “adjacent concrete secondary product” refers to a concrete secondary product that is adjacent to each other so as to form one flow path when the flow paths formed by the concrete walls are connected by a joint.
The “flow path center line of the secondary concrete product” refers to a line connecting the centers of the cross sections of the flow path of the concrete secondary product. For example, if the concrete secondary product forms a side groove having a circular flow path, the central axis of the cylindrical flow path is the flow path center line.
The “intersection angle between the flow path center lines of the adjacent concrete secondary products” refers to an angle at which the flow path center lines on the end surface of the concrete secondary product or extension lines linearly extending from each other intersect. When the concrete secondary product is laid in a straight portion of the road, that is, in an unbent place, the flow path center lines overlap with each other, so the intersection angle is 180 °.
[0010]
It is preferable that the belt portion has a V shape in which a center portion in the width direction protrudes outward in the radial direction. According to this structure, since the band part of a joint is V shape, the width | variety of V shape is adjusted according to the magnitude | size of the clearance gap between concrete products. Therefore, when the crossing angle between the flow path center lines of the adjacent concrete secondary products is other than 180 °, the gap changes according to the position of the opposite end faces. The width of the character changes to adjust the width dimension.
Here, the “V-shape” includes not only a so-called typical V-shape bent at the top but also a more rounded U-shape, and the width dimension of the belt along the circumferential direction. All shapes that can be changed and whose center part in the width direction protrudes are included.
[0011]
Each of the attachment portions is preferably attached to the inner surface of the concrete wall. According to this structure, the space divided by the opposing end surface of the adjacent concrete secondary product can be ensured in the outer peripheral part of the joint. Therefore, if concrete is placed in this space, for example, the secondary concrete product and the joint can be fixed. When the attachment portion is attached to, for example, the outer surface portion of the concrete wall, liquid passing through the flow path is accumulated between the concrete secondary products, but there is no such fear because it is attached to the inner surface of the concrete wall.
[0012]
Each of the attachment portions is preferably formed by an engagement protrusion that engages with a groove provided on the inner surface of the concrete wall. According to this configuration, the secondary concrete product and the joint can be connected without using an adhesive or the like.
[0013]
In a preferred embodiment of the present invention, a water stop material is provided between the engagement protrusion and the inner surface of the groove. According to this structure, it can prevent more reliably that the liquid which passes a flow path flows out to the outer periphery of a joint with a water stop material. Moreover, if an elastic member is used as the water stop material, it is possible to absorb a dimensional error due to processing of the end portion of the joint and the concrete wall. Further, when the engagement protrusion of the joint engages with the groove provided on the inner surface of the concrete wall, the engagement protrusion is pressed against the side surface of the groove by the water stop material made of an elastic member, so that it passes through the flow path. It is possible to more effectively suppress the liquid from flowing out to the outer periphery, and a more excellent water stop effect is achieved. Furthermore, depending on the material of the water stop material, it is possible to further prevent the end of the joint from coming out of the groove.
Here, the “water blocking material” refers to a member that blocks a liquid such as water passing through a flow path formed by a concrete wall or significantly reduces water permeability.
[0014]
In a preferred embodiment of the present invention, a recessed portion is provided in the inner diameter side portion of the end surface of the concrete secondary product so as to be recessed in the flow path direction and accommodate the band portion. According to this configuration, since the V-shaped belt portion is accommodated in the two recessed portions opposed to each other in the adjacent concrete product, even if a joint is interposed at the joint of the adjacent concrete secondary product, the joint is obstructed. The concrete secondary products can be brought close to each other without being done.
[0015]
In a preferred embodiment of the present invention, the concrete secondary product forms part of a side groove having a circular channel.
[0016]
Of the present invention Used for joint structure of secondary concrete products The joint is a ring-shaped joint that has flexibility and connects the concrete secondary products to each other. The joint extends along the circumferential direction and is located on both ends of the belt. An end portion having an attachment portion attached to a product, and the band portion has a V-shape in which a center portion in the width direction protrudes radially outward, and the width dimension can be changed along the circumferential direction. .
[0017]
In a preferred embodiment of the present invention, the ratio of the height to the width of the band is in the range of 0.1 to 0.5 in a natural state where no external force acts on the joint. According to this configuration, since the ratio of the height to the width of the V-shaped belt portion is not too large in the natural state, the joint can be bent smoothly, and the width dimension can be reduced according to the size of the seam. Further, since the ratio is not too small in the natural state, the width dimension of the belt portion can be increased by sufficiently following the change in the circumferential direction of the belt portion to the size of the seam.
More preferably, the ratio of the height to the width of the band is in the range of 0.15 to 0.35 in a natural state where no external force acts on the joint. More preferably, the ratio of the height to the width of the band portion is in the range of 0.2 to 0.3 in a natural state where no external force acts on the joint.
[0018]
In a preferred embodiment of the present invention, a bent part having a thickness smaller than that of the band part is provided between the band part and the end part. According to this structure, since the bending part with a thin flesh pressure exists, the joint can be easily bent at the bending part.
Here, the “bent portion” refers to a portion that further promotes the bending of the V-shaped band portion with respect to the end portion at the side end portion thereof.
[0019]
In a preferred embodiment of the present invention, the end portion is provided with fins extending toward the band portion on the outer peripheral surface that comes into contact with the concrete secondary product, and the fins can be bent radially inward. Part. According to this configuration, since the fin presses the concrete secondary product, the joint and the concrete secondary product are brought into close contact with each other. Therefore, there is no possibility that the liquid flowing through the flow path of the concrete secondary product will leak.
[0020]
the above Joint construction method for secondary concrete products As Is a joint construction method in which a joint according to the present invention is interposed at the joint of a concrete secondary product that is arranged in a large number along the flow path direction and forms a flow path by a concrete wall. One attachment part of the joint is attached to the concrete wall of the product, the joint is attached to the one concrete secondary product, and the other attachment part of the joint is attached to the concrete wall of the other concrete secondary product. Attach and attach the joint to the other concrete secondary product.
[0021]
According to this configuration, it is possible to connect the two concrete secondary products with the joints by simply attaching the two attachment parts of the joints to the concrete wall of the concrete secondary product. Thus, the connection work becomes easy.
[0022]
In a preferred embodiment of the present invention, the engagement protrusions forming both attachment portions of the joint are fitted into grooves provided on the inner surfaces of the concrete walls of the both concrete secondary products, so that the joint is both concrete. Attach to secondary products. According to this structure, since the engagement protrusion of the joint is fitted into the groove of the concrete wall, it is possible to prevent the joint from coming off from the concrete secondary product. Therefore, since it is not necessary to use an adhesive or the like, the connection work is further facilitated.
[0023]
In a preferred embodiment of the present invention, after the water stop material is inserted into the groove, the engagement protrusion is fitted. According to this configuration, it is possible to more reliably prevent the liquid passing through the flow path from flowing out to the outer periphery of the joint by only a simple operation of inserting the water stop material into the groove.
[0024]
In a preferred embodiment of the present invention, after the joint is mounted on both concretes by the joint construction method, the crossing angle between the flow path center lines of both concrete secondary products is adjusted according to the laying place of the concrete secondary products. To do. According to this configuration, the concrete secondary product can be disposed on the curved portion of the road only by adjusting the crossing angle between the flow path center lines of the concrete secondary product, that is, by adjusting the position of the concrete secondary product. .
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
As shown in the longitudinal sectional view of FIG. 1, the connection structure of concrete secondary products according to the present invention is arranged in a large number in the flow direction S, and the concrete secondary product 1 in which a flow path 21 is formed by a concrete wall 11. In this joint structure, a flexible ring-shaped joint 3 is interposed in the joint 2.
[0026]
The adjacent concrete secondary product 1 is a side groove block for forming a circular flow path. When the adjacent gutter blocks 1 and 1 are connected by the joint 3, the flow paths 21 and 21 are connected. Since the side groove block 1 is linear along the longitudinal direction X thereof, that is, along the flow path 21, when the side groove block 1 is laid in a curved portion L10 of the side groove located on the side of the road, that is, in a curved place, the adjacent side groove The crossing angle θ1 between the flow path center lines 22 of the blocks 1 and 1 is set to 174 ° in this example other than 180 °. By arranging a plurality of side groove blocks 1 in this way, it is possible to lay side grooves in the curved portion L10.
[0027]
As shown in FIG. 2, the lateral groove block 1 has a rectangular parallelepiped shape, and a flow path 21 having a circular cross section S1 is formed at the center thereof, and a cutout portion 18 reaching the flow path 21 from the outer surface is formed at the upper portion thereof. It is formed extending in the flow path direction S. A flow path center line 22 connecting the center positions of the flow paths 21 is a straight line. The side groove block 1 includes a concrete wall 11, and the concrete wall 11 is connected to the side groove block 1 adjacent along the flow path direction S via a joint 3 (FIG. 1).
[0028]
The end 31 of the side groove block 1 in the flow path direction S stores the band portion 31 so that the band portion 31 of the joint 3 does not get in the way when the side groove blocks 1 are brought into close contact with each other as shown in FIG. A recessed portion (housing portion) 15 is formed for this purpose. A groove 16 is formed at the end portion in the flow direction S in the inner portion of the flow direction S near the end portion and closer to the end portion. As shown in FIG. 5A, the recessed portion 15 has a bottom surface 15 a that is parallel to the end surface 14 in the flow direction S and a peripheral surface 15 b that is a concentric cylindrical surface with the inner surface 11 a of the wall 11. Close to the end face 14 of the groove 16 Small Wall 17 The Low formation Shi Position radially outside the inner surface 11a of the wall 11 Let ing.
[0029]
FIG. 3 shows an outline of the joint 3 in a natural state before being interposed between the side groove blocks 1 and 1. The joint 3 includes a band portion 31 extending along the circumferential direction D1, and two end portions 32 and 32 that are respectively located on both side ends (both axial ends) of the band portion 31 and have attachment portions 32a. . The band 31 extends along the seam 2 so as to fill the seam 2 between the side groove blocks 1 and 1 in FIG. 1, and follows the crossing angle θ1, and has a width dimension W in the circumferential direction D1. It can be changed. The attachment portion 32a (FIG. 3) is attached to the concrete wall 11.
[0030]
In the joint 3 of FIG. 3, the band portion 31 and the end portion 32 are integrally formed from a rubber material. The rubber material is preferably natural rubber, styrene butadiene rubber, chloroprene rubber, or ethylene propylene rubber, which is excellent in weather resistance, water resistance, alkali resistance, and the like. Further, the joint 3 may be formed of a material other than a rubber material, for example, a synthetic resin that is soft and has excellent weather resistance and water resistance. Examples of such a synthetic resin include soft polyvinyl chloride, polyurethane, or thermoplastic elastomer.
[0031]
As shown in a cross section in FIG. 4A, the band portion 31 has a V shape in which a center portion 31 a in the width direction protrudes outward of the joint 3. Thus, by making it V shape and forming it from a rubber material as mentioned above, flexibility is given to belt part 31 of joint 3. Specifically, the width dimension W changes in accordance with the change in the gap between the side groove blocks 1 and 1 (FIG. 1), that is, the size of the joint 2 (FIG. 1). That is, if the gap is large, the V-shaped apex, that is, the central portion 31a of the band portion 31 is displaced radially inward SI, and the width dimension W increases. On the other hand, when the gap is small, the center portion 31a of the band portion 31 has a small displacement amount in the radially inward SI, and greatly protrudes radially outward SO, and the width dimension W remains small.
[0032]
In the natural state where the joint 3 is not attached to the joint 2 between the side groove blocks 1 and 1 in FIG. 1, the width dimension W of the joint 3 shown in FIG. 3 is constant without changing in the circumferential direction D1 of the band portion 31. It is.
[0033]
As shown in FIG. 4A, the joint 3 is provided with a bent portion 33 having a thickness smaller than that of the band portion 31 between the band portion 31 and the end portion 32. When the gap between the side groove blocks 1 and 1 (FIG. 1) is small, the width dimension W is reduced in accordance with this size. However, since the bent portion 33 exists, the side end portion 31b of the band portion 31 is radially outside. Bends easily in the direction SO.
[0034]
In the joint 3 in the present embodiment, the ratio of the height H to the width W of the band portion 31 (H / W) is 0.25 in a natural state where no force acts on the joint 3. If this ratio (H / W) is less than 0.1, the amount of protrusion to the radially outward SO is small, so the width dimension W can hardly be increased from the dimension in the natural state. On the other hand, if this ratio (H / W) is greater than 0.5, the top portion 31a of the band 31 protrudes greatly outward in the radial direction SO, and the end portion 31b of the band 31 is already bent to some extent. Beyond that, it becomes difficult to bend smoothly. Therefore, in order to make the expansion and contraction in the width direction of the band 31 smooth and to ensure a certain range in which the width dimension W of the band 31 can be changed, the ratio of the height H to the width W of the band 31 (H / W) Is in the range of 0.1 to 0.5, preferably in the range of 0.15 to 0.35, and more preferably in the range of 0.2 to 0.3.
[0035]
The attachment part 32a of the end part 32 consists of an engaging protrusion. The engaging protrusion 32a engages with the groove 16 provided on the inner surface 11a of the concrete wall 11 in both the left and right side groove blocks 1 in FIG. 5A, and prevents the joint 3 from coming out of the concrete wall 11. . Therefore, the joint 3 can be attached to the side groove block 1 without using an adhesive or the like.
[0036]
Fins 32b and 32b are provided on the outer peripheral surface of the joint 3 shown in FIG. 4A, which is in contact with the side groove blocks 1 and 2 at both ends 32 and 32, closer to the band 31 than the engaging protrusion 32a. Yes. The fin 32 b extends from the end portion 32 toward the band portion 31. When a force for pressing the joint 3 from the outer surface is applied, the tip 32ba of the fin 32b is curved toward the inward SI of the joint 3. In the present embodiment, one fin 32b is provided at one end 32, but a plurality of fins 32b may be provided as shown in FIG. 4B.
[0037]
5A is an enlarged view of a portion indicated by a circle A in FIG. 1, and FIG. 5B is an enlarged view of a portion indicated by a circle B in FIG. That is, the connection structure of the joint 3 and the side groove block 1 in a state where the joint 3 is interposed in the joint 2 between the side groove blocks 1 and 1 is shown.
[0038]
The engagement protrusion 32 a of the end 32 of the joint 3 engages with the groove 16 of the concrete wall 11, and the end 32 is attached to the end of the concrete wall 11. A water-stop material 4 is inserted or filled between the engagement protrusion 32 a of the end portion 32 of the joint 3 and the groove 16.
[0039]
The water-stop material 4 is formed from a sealing material made of rubber or synthetic resin foam such as CR sponge or urethane sponge, low-density rubber or synthetic resin, water-swelling rubber or modified silicon-based sealing material, for example. The
[0040]
When the water blocking material 4 has an elastic force, the water blocking material 4 presses the engaging protrusion 32 against the side surface 16 a of the groove 16. Therefore, it can suppress more effectively that a liquid flows out to an outer periphery, and the further outstanding water stop effect is show | played. Moreover, it can prevent that the edge part 32 of the coupling 3 pulls out from the groove | channel 16 depending on the raw material of the water stop material 4, etc. FIG.
[0041]
The fin 32b is a concrete wall 11 Small wall 17 The tip 32ba is pressed against the inner SI of the joint 3. Thereby, the concrete wall 11 and the joint 3 adhere, and watertightness is ensured. That is, it is possible to prevent the liquid passing through the flow path 21 from leaking to the outside 50 of the side groove block.
[0042]
As shown in FIG. 5B, the recessed portion 15 accommodates the bent band portion 31 of the joint 3. Therefore, the end surfaces 14 and 14 of the side groove blocks 1 and 1 can be in contact with each other at the sides 14a and 14a located inside the curved portion L10 without being obstructed by the band portion 31.
[0043]
Returning to FIG. 1, the laying angle θ2 of the curved portion L10 is such that when the end surfaces 14, 14 (FIG. 2) of the adjacent side groove blocks 1, 1 are in contact with each other at one side 14a of the inner side 61 of the curved portion L10, The angle formed by the outer surface 12b located on the inner side 61 of the curved portion of the block 1 and the tangent L20 passing through the one side 14a of the curvature circle C in contact with the outer surface 12b of the adjacent side groove block 1 is referred to. In the present embodiment, the laying angle θ2 can be expressed as θ2 = (180 ° −θ1) when the intersection angle θ1 between the flow path centerlines 22 and 22 is used. For example, when the gutter block 1 having a length L5 of 50 cm and a width L6 of 45 cm is used, when the road radius of curvature R is 3 m, the laying angle θ2 is about 10 °. When the curvature radius R is 3 m or less, the gutter block 1 protrudes to the center of the road, and the effective area of the road is reduced. Therefore, in the joint structure of the present invention, the radius of curvature R is preferably 3 m or more, and more preferably 5 m. That is, the laying angle θ2 is preferably greater than 0 ° and not more than about 10 °, and more preferably about 6 °. Accordingly, the joint structure of the present invention is preferably applied when the crossing angle θ1 between the flow path center lines of the side groove block 1 is less than about 180 ° and about 170 ° or more, and is applied when it is about 174 °. More preferably.
[0044]
Hereinafter, the joint construction method of the side groove block concerning this invention is demonstrated, referring FIG. 1, FIG. 5 (a), (b) and FIG. 6 (a)-(e).
First, the side groove blocks 1 are roughly arranged in accordance with the curve for laying the drain side grooves shown in FIG. As shown in FIG. 6 (a), the two gutter blocks 1, 1 connected by the joint face each other with a space necessary for work. Next, as shown in FIG. 6B, which shows a cross section taken along line B-B in FIG. 6A, the water blocking material 4 is inserted into the groove 16 provided on the inner surface 11 a of the one side groove block 1. Similarly, the water blocking material 4 is also inserted into the groove 16 of the other side groove block 1.
[0045]
Thereafter, as shown in FIG. 6C, the ring-shaped joint 3 is aligned with the circular cross section of the flow path 21, the end 32 is pressed against the side groove block 1, and moved to the inner side X <b> 1 in the axial direction. Specifically, the end portion 32 is inserted while pressing the water blocking material 4 until the engagement protrusion 32 a of the joint 3 is fitted in the groove 16. The engagement protrusion 32a does not easily come out of the groove 16 due to the elastic restoring force radially outward, but the engagement protrusion 32 is pressed against the side surface 16a of the groove by the water blocking material 4, so Removal from the groove 16 is more reliably prevented. In this way, one attachment portion 32 a of the joint 3 is attached to the concrete wall 11.
[0046]
By inserting the engaging protrusion 32a of the joint 3 into the groove 16, the tip end portion 32ba of the fin 32b can be connected to the concrete wall 11. Small wall 17 Is inserted between the groove 16 and the recessed portion 15 of the concrete wall 11 while being pushed toward the band portion 31 side of the joint 3. Accordingly, the fin 32b and the concrete wall 11 are in close contact with each other, and water tightness is ensured.
[0047]
As shown in FIG. 6D, after the joint 3 is attached to one side groove block 1, the joint 3 is attached to the other side groove block 1 in the same manner.
[0048]
Next, as shown in FIG. 6 (e), according to the laying place of the side groove block 1, that is, according to the curved portion L10 of FIG. The crossing angle θ1 with the flow path center line 22 of the other side groove block 1 is adjusted. The adjustment of the crossing angle θ1 only needs to be performed by moving the adjacent gutter blocks 1 and 1 in FIG.
Here, as shown in FIG. 5 (a), the joint 3 has flexibility and is prevented from coming out of the side groove block 1 by the engagement protrusion 32a, so that the adjusted crossing angle θ1 (FIG. 1) is adjusted. ), The width 31 of the band 31 of the joint 3 changes along the circumferential direction D1 shown in FIG. Therefore, as can be seen from FIGS. 5A and 5B, the band portion 31 of the joint 3 has a fan shape in plan view. That is, in the outer portion of the curved portion L10 shown in FIG. 5A, the width dimension W of the belt portion 31 is larger, and in contrast, in the inner portion of the curved portion L10 shown in FIG. The width dimension W of 31 is small.
[0049]
By performing the above processing between the side groove blocks 1, the laying of the drain side groove in the curved portion L10 of the road shown in FIG. 1 is completed.
[0050]
In addition, you may drive mortar concrete into the joint 2 of the gutter block 1 in the outer part of the curved part L10 shown to Fig.5 (a). Further, the outer side of the concrete walls 11 and 11 of the gutter block 1 may be subjected to processing such as backfilling with earth and sand, and road pavement may be performed as necessary. By doing in this way, the coupling 3 and the side groove block 11 are connected more firmly. In this embodiment, since the end portion 32 of the joint 3 is attached to the inner surface 11a of the side groove block 1, that is, the flow path 21 side, a sufficient space is provided when placing concrete between the side groove blocks 1 and 1. It is secured.
[0051]
In this embodiment, the water blocking material 4 is inserted into the groove 16 of the side groove block 1 in advance, and then the engaging protrusion 32a of the joint 3 is inserted into the groove 16, but is stopped at the tip of the engaging protrusion 32a of the joint 3 in advance. The water material 4 may be adhered.
[0052]
The joint structure according to the present invention is suitable for a curved portion of a road, but can naturally be applied even to a straight portion where the crossing angle of the concrete secondary product 1 is 0 °. Therefore, by repeatedly applying the joint construction method according to the present invention to a large number of concrete secondary products 1, the concrete secondary product can be laid down to a straight line portion extending from the curved portion of the road.
[0053]
【The invention's effect】
As described above, according to the joint structure of the present invention, the width dimension in the circumferential direction can change following the intersection angle between the flow path center lines of adjacent concrete secondary products, so the intersection angle is other than 180 °. Even in curved sections of roads, it is possible to easily lay straight concrete secondary products. Therefore, the concrete secondary product can be utilized without placing concrete in the curved portion, so that the construction period can be shortened and the quality can be ensured.
[Brief description of the drawings]
FIG. 1 is a plan view showing a joint structure according to an embodiment of the present invention.
2 is a perspective view of a secondary concrete product constituting the joint structure of FIG. 1. FIG.
3 is a perspective view of a joint constituting the joint structure of FIG. 1. FIG.
[Fig. 4] (A) Of FIG. Width direction Enlarged part It is sectional drawing, (b) is a cross section of the other Example. FIG.
5A is an enlarged plan view of a circle A portion of FIG. 1, and FIG. 5B is an enlarged plan view of a circle B portion.
FIGS. 6A to 6E are perspective views showing a construction method of the joint structure of FIG.
FIG. 7 is a longitudinal sectional view showing a conventional joint structure.

Claims (4)

In the joint structure of a concrete secondary product in which a flexible ring-shaped joint is interposed at the joint of a concrete secondary product that is arranged in a large number along the flow path direction and forms a flow path by a concrete wall, the joint Is provided with a recessed portion parallel to the end surface from the inner surface side which is the flow path surface side of the end surface of the concrete wall, and the inner surface side of the concrete wall is continuously connected to the bottom surface side of the recessed portion in the radial direction of the concrete secondary product. A small wall is formed so as to be positioned on the outside, and a groove is formed on the inner surface side of the small wall continuously from the end surface. On the other hand, the joint is used for an adjacent concrete secondary product. The dimensional ratio H / W between the width (W) in the circumferential direction and the height (H) in the radial direction follows the crossing angle between the flow path center lines. A band part that is stretchable along the circumferential direction, and the band part An end portion provided with engaging projections on the side edge, will be more formed into a fin which projects toward the band portion from the outer peripheral surface in contact with the secondary concrete products of the end portion, the concave join the club is The storage portion can store the belt portion, the small wall is a watertight portion for preventing leakage of the liquid flowing through the flow path where the tip end portion of the fin comes into contact and bends closely, and the groove is formed on the both side ends. A joint structure for a secondary concrete product, wherein the engaging projection is an engaging portion that is engaged and pressed by a water-stopping material.   The joint structure of a secondary concrete product according to claim 1, wherein the band portion has a V shape in which a central portion in the width direction protrudes radially outward.   3. The concrete secondary product according to claim 1, wherein a water-stopping material is provided between the engagement protrusion and the inner surface of the groove, and the engagement protrusion is pressed against a side surface of the groove. Joint structure.   The joint structure for a concrete secondary product according to any one of claims 1 to 3, wherein the concrete secondary product forms a part of a side groove having a circular channel.

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