JP2006009460A - Joint material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a joint material having a small resistance against a concrete expansion pressure of a joint seat and capable of certainly absorbing the expansion of the concrete. <P>SOLUTION: In a joint material having a narrow erected structure of a planar joint main body 2, formed of an elastic material on a wide joint seat 1 formed of an elastic material, by providing a compression resistance decreasing part 7 reducing the compression resistance of the joint seat 1, at a part of the joint seat 1, the joint seat 1 forming an initial resistance position of the compression pressure of the concrete absorbs the expansion of the concrete by constriction due to the material quality when the compression pressure acts on the longitudinal both faces of the joint material, and further, the expansion of the concrete is absorbed at the compression resistance decreasing part 7 provided at a part of the joint seat 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a joint material that divides and cuts the casting surface of concrete to prevent the occurrence of cracks and the like due to the expansion and contraction of the concrete.

  In order to prevent the occurrence of cracks and the like due to the expansion and contraction of concrete when placing concrete, joint materials are previously installed at predetermined intervals before placing concrete.

Conventionally, as such joint material, a narrow plate-shaped joint main portion made of an elastic material is erected on a wide joint base portion made of an elastic material such as a foam of synthetic resin such as polyethylene and polystyrene. Well-structured joint materials are known. As this joint material, the joint base part and the plate-like joint main part are integrally formed (for example, refer to Patent Document 1), or as shown in FIG. The ground main portion 2 is formed as a separate body, a fitting groove 3 is formed on the upper surface of the joint pedestal portion 1, and the plate-shaped joint main portion 2 is fitted into the fitting groove 3 so as to stand upright. (For example, refer to Patent Document 2). In the joint material 4 having such a structure, the top height of the plate-like joint main portion 2 is formed to a height corresponding to the concrete placement thickness, and before the concrete placement, the concrete placement foundation The bottom surface of the joint pedestal 1 is bonded and fixed on the surface 5 with an adhesive or the like. And the joint material 4 arrange | positioned on the concrete placement foundation surface 5 can absorb the expansion | swelling of the concrete 6 which receives to the both sides | surfaces of the length direction.
Japanese Utility Model Publication No.59-12347 Japanese Utility Model Publication No. 62-23950

  However, in the joint material having such a structure, as shown in FIG. 7, when the cast concrete 6 expands, the expansion pressure of the concrete 6 is applied to both side surfaces in the longitudinal direction of the joint material 4, and the joint material 4 It contracts due to the material properties and absorbs the expansion of the concrete 6. At this time, the joint base part 1 is wider than the plate-like joint main part 2, so that the joint base part 1 becomes the first resistance portion of the expansion pressure of the concrete 6. The expansion of the concrete 6 is first absorbed by the joint pedestal 1, but due to the resistance of the joint pedestal 1, a portion of the concrete 6 that has received the resistance is delayed from the joint pedestal 1 and becomes the resistance portion. As a result, there is a problem that the concrete 6 near both sides of the joint material 4 is cracked or the concrete 6 is raised.

  An object of the present invention is to provide a joint material in which the resistance against the concrete expansion pressure of the joint pedestal is reduced and the expansion of the concrete can be reliably absorbed.

  The configuration of the present invention that achieves the above object will be described as follows.

  The invention according to claim 1 is a joint material having a structure in which a narrow plate-shaped joint main portion made of an elastic material is erected on a wide joint base portion made of an elastic material, and a part of the joint pedestal portion In addition, a compression resistance reducing portion for reducing the compression resistance of the joint base is provided.

  With this configuration, when concrete expansion pressure is applied to both side surfaces of the joint material in the longitudinal direction, the joint pedestal that becomes the first resistance site of the concrete expansion pressure contracts due to its material properties and absorbs the expansion of the concrete. However, the compression resistance decreasing part provided in a part of the joint base part makes the compression resistance of the joint base part with respect to the expansion pressure of the concrete smaller than the compression resistance due to its material characteristics alone, and the expansion of the concrete The phenomenon that part of the concrete that expands and expands to the plate-like joint main part side does not occur.

  According to a second aspect of the present invention, the joint base portion and the plate-shaped joint main portion according to the first aspect are integrally formed, and the compression resistance reducing portion provided in a part of the joint base portion is The groove is formed by a groove that opens at the bottom of the joint pedestal.

  From this configuration, since the compression resistance decreasing part is formed by a groove that opens at the bottom of the joint base part, when the expansion pressure of concrete is applied to the joint base part of the joint material, the joint base part has its material characteristics. In addition to shrinkage, the groove space constituting the compression resistance reducing portion is deformed, and the deformation of the groove space reduces the compression resistance of the joint pedestal against the expansion pressure of the concrete, less than the compression resistance due to its material characteristics alone. Thus, the expansion of the concrete is surely absorbed, and a phenomenon in which a part of the expanding concrete rises and moves to the plate joint main portion side does not occur.

  In addition, since the groove constituting the compression resistance reducing portion is open at the bottom of the joint pedestal portion, there is no possibility that the placed concrete will enter the groove, and there is no possibility of impairing the function as the compression resistance reducing portion. . Furthermore, since the compression resistance decreasing portion is provided by forming a groove in the bottom portion of the joint pedestal during manufacture, the manufacture is easy and the cost is not increased as compared with the conventional joint material.

  The invention according to claim 3 is the fitting according to claim 1, wherein the joint base part and the plate-like joint main part are formed separately, and a fitting groove is formed on the upper surface of the joint base part. The plate-shaped joint main portion is fitted and erected in a groove, and the compression resistance reducing portion provided in the joint base portion is formed by a groove that opens at the bottom of the joint base portion. And

  From this configuration, since the compression resistance decreasing part is formed by a groove that opens at the bottom of the joint base part, when the expansion pressure of concrete is applied to the joint base part of the joint material, the joint base part has its material characteristics. In addition to shrinkage, the groove space constituting the compression resistance reducing portion is deformed, and the deformation of the groove space reduces the compression resistance of the joint pedestal against the expansion pressure of the concrete, less than the compression resistance due to its material characteristics alone. Thus, the expansion of the concrete is surely absorbed, and a phenomenon in which a part of the expanding concrete rises and moves to the plate joint main portion side does not occur.

  In addition, since the groove constituting the compression resistance reducing portion is open at the bottom of the joint pedestal portion, there is no possibility that the placed concrete will enter the groove, and there is no possibility of impairing the function as the compression resistance reducing portion. . Furthermore, since the compression resistance decreasing portion is provided by forming a groove in the bottom portion of the joint pedestal during manufacture, the manufacture is easy, and the cost is not increased as compared with the conventional joint material.

  According to a fourth aspect of the present invention, the joint base portion and the plate-shaped joint main portion according to the first aspect are formed separately, and a fitting groove is formed on the upper surface of the joint base portion, and this fitting The plate-shaped joint main part is fitted and erected in the groove, and the compression resistance reducing part provided in the joint base part is formed by a hole or a slit penetrating the fitting groove of the joint base part. It is characterized by being.

  From this configuration, the compression resistance reducing portion is formed by a hole or slit that penetrates the fitting groove of the joint base portion, so that when the expansion pressure of concrete is applied to the joint base portion of the joint material, the joint base portion Not only shrinks due to its material properties, but also deforms the space of the hole or slit that constitutes the compression resistance reducing portion, and the deformation of the space of the hole or slit reduces the compression resistance of the joint pedestal against the expansion pressure of the concrete, The compression resistance due to the material characteristics alone is reduced, and the expansion of the concrete is reliably absorbed, and a phenomenon in which a part of the expanding concrete rises and moves to the plate joint main portion side does not occur.

  Further, the hole or slit constituting the compression resistance reducing portion is formed so as to penetrate the fitting groove of the joint base portion, but the plate-like joint main portion is fitted in the fitting groove. There is no possibility that the placed concrete will enter the hole or slit, and there is no possibility that the function as the compression resistance reducing portion will be impaired. Further, since the compression resistance reducing portion is provided by forming a hole or a slit in the fitting groove during manufacture, the manufacture is easy, and the cost is not increased as compared with the conventional joint material.

  The present invention provides a joint material having a structure in which a narrow plate-shaped joint main portion made of an elastic material is erected on a wide joint base portion made of an elastic material, and a joint pedestal is formed on a part of the joint pedestal portion. Since the compression resistance decreasing part that reduces the compression resistance of the part is provided, when the expansion pressure of the concrete is applied to both sides in the longitudinal direction of the joint material, the joint pedestal that becomes the first resistance part of the expansion pressure of the concrete is The material shrinks due to its material characteristics and absorbs the expansion of the concrete, but the compression resistance decreasing part provided in a part of the joint base part reduces the resistance of the joint base part against the expansion pressure of the concrete only by the material characteristic. Therefore, the expansion of the concrete is surely absorbed, and a part of the expanding concrete does not move up to the plate joint main part side. Cracks or occur in Nkurito, concrete it is possible to reliably eliminate concerns such as rising auction.

  Hereinafter, each example of the best mode for carrying out the joint material according to the present invention will be described in detail with reference to the drawings.

  1 and 2 show a first example of a joint material according to the present invention. FIG. 1 is a perspective view of the joint material of this example. FIG. 2 is a perspective view of the joint material shown in FIG. FIG.

  The joint material 4 of this example has a narrow plate-like joint main portion 2 made of an elastic material on a wide joint base portion 1 made of an elastic material such as foam of synthetic resin such as foamed polyethylene and polystyrene. It has a structure that stands integrally. In the joint base part 1 and the plate-like joint main part 2, there is no difference from the joint base part and the plate-like joint main part constituting this type of joint material.

  The joint pedestal portion 1 is provided with a compression resistance reducing portion 7 for reducing the compression resistance in the width direction of the joint pedestal portion 1 at a part thereof. In this example, the compression resistance reducing portion 7 is formed by a groove 8 that opens at the bottom of the joint base 1. The groove 8 is formed at the bottom of the joint base 1 along the longitudinal direction of the joint material 4. The shape, groove width, and groove depth of the groove 8 are not particularly limited. However, when the groove width is narrow and the groove depth is shallow, the compression resistance in the width direction of the joint base 1 is sufficient. If the groove width is wide and the groove depth is deep, the strength of the joint base 1 may not be maintained. It is required to set the height within a range in which the compression resistance in the width direction of the joint base 1 can be reduced and the strength of the joint base 1 can be maintained.

  As described above, the groove 8 is formed at the bottom of the joint pedestal 1 so as to become the compression resistance decreasing portion 7 that reduces the compression resistance in the width direction of the joint pedestal 1, and thus the joint pedestal 1 of the joint material 4 is formed in the joint pedestal 1. When the expansion pressure of concrete is applied from both sides in the width direction, the joint pedestal portion 1 not only contracts due to its material characteristics, but also the space of the groove 8 is deformed. The compression resistance of the joint pedestal 1 against the expansion pressure is made smaller than the compression resistance due to the material characteristics alone, so that the expansion of the concrete is reliably absorbed, and a part of the expanding concrete rises to the plate-shaped joint main part side. There is no moving phenomenon.

  Further, since the groove 8 constituting the compression resistance reducing portion 7 is opened at the bottom of the joint base 1, there is no possibility that the placed concrete enters the groove, and the function as the compression resistance reducing portion 7 is achieved. There is no risk of damage. Further, since the compression resistance reducing portion 7 is provided by forming the groove 8 in the bottom portion of the joint base 1 at the time of manufacture, the manufacture is easy and the cost is not increased as compared with the conventional joint material. .

  3 and 4 show a second example of the joint material according to the present invention, FIG. 3 is a perspective view of the joint material of this example, and FIG. 4 shows a plate-like joint main portion of the joint material shown in FIG. It is a top view of the removed joint base part.

  The joint material 4 of this example has a wide joint base portion 1 made of an elastic material such as foam of synthetic resin such as foamed polyethylene and polystyrene, and a narrow plate-like joint main portion 2 made of an elastic material separately. The fitting groove 3 is formed on the upper surface of the joint base 1, and the plate-like joint main portion 2 is fitted into the fitting groove 3 so as to stand upright. In the joint base part 1 and the plate-like joint main part 2, there is no difference from the joint base part and the plate-like joint main part constituting this type of joint material.

  The joint pedestal portion 1 is provided with a compression resistance reducing portion 7 for reducing the compression resistance in the width direction of the joint pedestal portion 1 at a part thereof. In this example, the compression resistance reducing portion 7 is formed by the slit 9 penetrating the fitting groove 3 of the joint base 1, but the present invention is not limited to this, and as shown in FIG. It may be formed by a hole 10 penetrating the fitting groove 3 of the part 1.

  The slit 9 or the hole 10 is formed at the bottom of the joint base 1 along the longitudinal direction of the joint material 4. The shape and width of the slit 9 and the size of the hole 10 are not particularly limited, but when the width of the slit 9 is narrow or the hole 10 is small, the joint base 1 is compressed in the width direction. In some cases, the resistance cannot be made sufficiently small, and when the width of the slit 9 is wide or the hole 10 is large, the strength as the joint base 1 may not be maintained. Moreover, it is required to set the size of the hole 10 within a range in which the compression resistance in the width direction of the joint base 1 can be reduced and the strength as the joint base 1 can be maintained.

  As described above, the slit 9 or the hole 10 that becomes the compression resistance reducing portion 7 that reduces the compression resistance in the width direction of the joint base 1 is formed in the joint base 1 so as to penetrate the fitting groove 3 of the joint base 1. Therefore, when the expansion pressure of concrete is applied to the joint base part 1 of the joint material 4 from both sides in the width direction, the joint base part 1 not only contracts due to its material characteristics but also the slit 9 or the hole 10. Therefore, the deformation of the space of the slit 9 or the hole 10 causes the compression resistance of the joint base 1 to the expansion pressure of the concrete to be smaller than the compression resistance due to the material characteristics alone, and the expansion of the concrete is reduced. The phenomenon that the part of the concrete that absorbs and expands reliably rises and moves to the plate-shaped joint main portion side does not occur.

  Further, the slit 9 or the hole 10 constituting the compression resistance reducing portion 7 is formed so as to penetrate the fitting groove 3 of the joint base 1, and the plate-like joint main portion 2 is formed in the fitting groove 3. Since it is fitted, there is no possibility that the placed concrete will enter the slit 9 or the hole 10, and there is no possibility that the function as the compression resistance reducing portion 7 is impaired. Further, in the manufacture, the compression resistance reducing portion 7 is provided by forming the slit 9 or the hole 10 in the fitting groove 3, so that the manufacture is easy and the cost is increased as compared with the conventional joint material. Must not.

  FIG. 6 shows a third example of the joint material according to the present invention, and FIG. 6 is a perspective view of the joint material of this example.

  As in the second example, the joint material 4 of this example includes a wide joint base 1 made of an elastic material such as a foam of synthetic resin such as foamed polyethylene and polystyrene, and a narrow plate made of the same elastic material. The joint-shaped main portion 2 is formed separately, and the fitting groove 3 is formed on the upper surface of the joint pedestal portion 1, and the plate-like joint main portion 2 is fitted into the fitting groove 3 so as to stand upright. It has become.

  The joint pedestal portion 1 is provided with a compression resistance reducing portion 7 for reducing the compression resistance in the width direction of the joint pedestal portion 1 at a part thereof. In this example, the compression resistance reducing portion 7 is formed by a groove 11 that opens at the bottom of the joint base 1.

  As in the first example, the groove 11 is formed along the longitudinal direction of the joint material 4 at the bottom of the joint base 1. The shape, groove width, and groove depth of the groove 11 are not particularly limited. However, when the groove width is narrow and the groove depth is shallow, the compression resistance in the width direction of the joint base 1 is sufficient. If the groove width is wide and the groove depth is deep, the strength as the joint base 1 may not be maintained. It is required to set the height within a range in which the compression resistance in the width direction of the joint base 1 can be reduced and the strength of the joint base 1 can be maintained.

  Thus, since the groove | channel 11 used as the compression resistance decreasing part 7 which makes the compression resistance of the width direction of the joint base part 1 small is formed in the bottom part of the joint base part 1, the joint base part 1 of the joint material 4 is formed in it. When the expansion pressure of the concrete is applied from both sides in the width direction, the joint pedestal portion 1 not only contracts due to its material characteristics, but also the space of the groove 11 is deformed. The compression resistance of the joint pedestal 1 against the expansion pressure is made smaller than the compression resistance due to the material characteristics alone, so that the expansion of the concrete is reliably absorbed, and a part of the expanding concrete rises to the plate-shaped joint main part side. There is no moving phenomenon.

  Further, since the groove 11 constituting the compression resistance reducing portion 7 is opened at the bottom of the joint base 1, there is no possibility that the placed concrete enters the groove, and the function as the compression resistance reducing portion 7 is achieved. There is no risk of damage. Furthermore, since the compression resistance reducing portion 7 is provided by forming the groove 11 in the bottom portion of the joint base 1 at the time of manufacture, the manufacture is easy and the cost is not increased as compared with the conventional joint material. .

It is a perspective view which shows the 1st example of embodiment of the joint material which concerns on this invention. It is the perspective view which looked at the joint material shown in FIG. 1 from the bottom face side. It is a perspective view which shows the 2nd example of embodiment of the joint material which concerns on this invention. It is a top view of the joint base part which removed the plate-shaped joint main part of the joint material shown in FIG. It is the top view of the joint base part which showed the other example of the compression resistance reduction part. It is a perspective view which shows the 3rd example of embodiment of the joint material which concerns on this invention. It is sectional drawing which shows the state using the conventional joint material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint base part 2 Plate-like joint main part 3 Fitting groove 4 Joint material 5 Concrete placement foundation 6 Concrete 7 Compression resistance reduction part 8 Groove 9 Slit 10 Hole 11 Groove

Claims (4)

  In a joint material having a structure in which a narrow plate-like joint main portion made of an elastic material is erected on a wide joint base portion made of an elastic material, a compression resistance of the joint base seat portion is applied to a part of the joint base seat portion. A joint material characterized in that a compression resistance decreasing portion for reducing the size is provided.   The joint base part and the plate-like joint main part are integrally formed, and the compression resistance reducing part provided in a part of the joint base part is formed by a groove opened at the bottom of the joint base part. The joint material according to claim 1.   The joint base part and the plate-like joint main part are formed separately, and a fitting groove is formed on the upper surface of the joint base part, and the plate-like joint main part is fitted into the fitting groove and stands upright. 2. The joint material according to claim 1, wherein the compression resistance decreasing portion provided in the joint base portion is formed by a groove that opens at a bottom portion of the joint base portion.   The joint base part and the plate-like joint main part are formed separately, and a fitting groove is formed on the upper surface of the joint base part, and the plate-like joint main part is fitted into the fitting groove and stands upright. 2. The joint material according to claim 1, wherein the compression resistance decreasing portion provided in the joint base portion is formed by a hole or a slit penetrating the fitting groove of the joint base portion.

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