JP2012241353A - Crack-inducing joint filler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crack-inducing joint filler which secures a required cross sectional defective rate corresponding to the wall thickness of a concrete structure, without causing problems in manufacturing and storing.SOLUTION: A splicing projection 13a which constitutes a connection 13 of a base component 11 is connected to a splicing recess 13b which constitutes a connection of a connection component 12, so that splicing is performed. Alteration of the combination of the base component 11 and the connection component 12 allows a cross sectional defective rate corresponding to the wall thickness of a concrete structure to be easily secured, using small varieties. In the case that a crack is induced, water is cut off by a water cutoff component 18 due to the adhesion of the water cutoff component 18 to concrete, so that a reinforcement bar 4 is prevented from being corroded by immersion. This secures a required cross sectional defective rate corresponding to the wall thickness of a concrete structure, avoiding a problem requiring new equipment in manufacturing or a problem in storing such as increase in variety, with unitization.

Description

    The present invention relates to a crack-inducing joint material, and is intended to suppress the occurrence of cracks in other parts by inducing cracks in a predetermined place of a concrete structure, in particular, the wall thickness of a concrete structure. It is a unit that can be easily accommodated even if the thickness of the is increased.

In the case of concrete structures in civil engineering and construction, deformation may occur due to factors such as temperature change due to the heat of hydration of cement and outside air temperature and drying shrinkage, and cracks will occur if such deformation is constrained. To do. If these cracks occur in any number of locations, problems such as loss of aesthetics and corrosion of reinforcing steel bars due to the ingress of moisture may occur.
In view of this, for the purpose of concentrating cracks at a predetermined location, a cross-sectional defect portion is provided at a predetermined interval in the concrete structure, and a crack-inducing joint portion for artificially generating a crack is provided.
Inclusions are embedded in the crack-inducing joints so that the cross-section is lost.For example, PVC pipes, precast concrete, or steel plates are embedded in concrete structures, and various pre-formed crack-inducing joint materials have been proposed. Adopted.

  For example, in the crack-inducing joint material of Patent Document 1, a joint material body in which a water-stopping deficient material in which a vertically long iron plate is used as a core material and flexible butyl rubber or the like is formed in a vertical bar shape is attached to a mold frame. It is arranged to face the inside of the concrete wall.

  In addition, the crack-inducing joint body of Patent Document 2 includes a flat portion and a tapered portion that tapers as it goes to the opposite side of the flat portion, and a T-shaped screw groove having an opening on the flat surface side is formed in the flat portion. Provided, an opening groove is provided at the tip of the tapered portion, and the opening groove is covered with a sheet that does not allow the concrete to pass therethrough, and the others are covered with a covering layer. It is fixed to the mold by putting it in the thread groove, and it is made to use it facing.

JP 2002-161544 A JP 2010-1644 A

However, in conventional crack-inducing joint materials, the height in the direction of the concrete wall thickness is constant, and when the concrete structure becomes larger and the concrete wall thickness increases, the cross-sectional defect rate required to induce cracks is increased. There is a problem that it cannot be set high (over 37.5%).
Therefore, it is sufficient to prepare a product with an increased height in the wall thickness direction. However, there are problems such as the need for new manufacturing equipment for resin molded products, and many products corresponding to the wall thickness should be prepared. If so, the number of varieties increases, causing problems in storage location and inventory management.
It is also possible to install a general-purpose PVC pipe adjacent to the existing crack-inducing joint material, but the problem is that it is heavier and harder to handle than the existing crack-inducing joint material, and the workability is also poor. There is.

  The present invention has been made in view of the above-described problems of the prior art, and can secure a necessary cross-sectional defect rate corresponding to the wall thickness of a concrete structure, resulting in problems in manufacturing and storage. It is intended to provide a crack-inducing joint material.

  The crack-inducing joint material according to claim 1 of the present invention that solves the above-mentioned problems of the prior art is a crack-inducing joint material that is embedded along the wall thickness direction of a concrete structure to cause a cross-sectional defect to induce cracks. A base member which is disposed on the inner side of the reinforcing reinforcing bar in the wall of the concrete structure and whose one end is supported and fixed to the reinforcing reinforcing bar, and a connecting portion is provided at the other end, and the connecting portion of the base member It is comprised with the connection member which is connected with the connection part which is connected to the base, and the base member and the connection member are provided with a water stop member which is in close contact with the concrete and is configured to stop water. It is a feature.

  The crack-inducing joint material according to claim 2 of the present invention is configured such that, in addition to the configuration according to claim 1, the connection portion is constituted by a recess for addition and a projection for extension, and can be slidably connected. It is characterized by being.

  According to a third aspect of the present invention, in addition to the structure according to the first or second aspect, the connection member is formed by forming a connection portion at the other end in addition to the connection at one end. In addition, a plurality of connecting members are connected to be connectable.

  A crack-inducing joint material according to claim 4 of the present invention includes, in addition to the structure according to any one of claims 1 to 3, the base member from a wall surface parallel base portion along a concrete wall surface and the wall surface parallel base portion. It is characterized by comprising a substantially T shape with a protruding base part protruding in the wall thickness direction.

According to the crack-inducing joint material according to claim 1 of the present invention, the crack-inducing joint material is embedded along the wall thickness direction of the concrete structure to cause a cross-sectional defect to induce a crack, and the concrete structure A base member that is disposed on the inner side of the reinforcing reinforcing bar in the wall and has one end supported and fixed to the reinforcing reinforcing bar, and a connecting portion provided at the other end, and a connecting portion connected to the connecting portion of the base member The base member and the connecting member are provided with a water-stopping member that is brought into close contact with the concrete to stop the water. By connecting the connecting parts of the connecting member, it is possible to add the cross section, and by changing the combination of the base member and the connecting member, the cross-sectional defect corresponding to the wall thickness of the concrete structure with a small variety Secure can be easily. Moreover, even if a crack is induced by the water-stopping member, the water can be stopped due to adhesion with concrete, and corrosion of the reinforcing steel bars due to water immersion can be prevented.
This makes it possible to ensure the required cross-sectional defect rate corresponding to the wall thickness of the concrete structure, avoiding problems in storage that require new equipment and storage due to an increase in variety. Can be unitized.

  According to the crack-inducing joint material according to claim 2 of the present invention, the connecting portion is constituted by the recess for addition and the protrusion for extension, and is configured to be slidable so that the connection portion is added. By sliding and connecting at the concavo-convex portion, it can be easily added and can be connected securely.

  According to the crack-inducing joint material according to claim 3 of the present invention, the connection member is formed by forming a connection portion at the other end portion in addition to the connection portion at one end portion, and a plurality of connection members are added and connected. Since it is possible to connect, multiple connecting members can be connected and added, the adaptability to changes in the thickness of the concrete wall can be further improved, the number of connecting members is reduced, and the quantity used is reduced. It can be changed to a corresponding unit.

  According to the crack-inducing joint material according to claim 4 of the present invention, the base member is substantially T between a wall surface parallel base portion extending along the concrete wall surface and a protruding base portion protruding from the wall surface parallel base portion in the wall thickness direction. Since it is configured in a letter shape, it can be easily supported and fixed to the reinforcing steel bars by the wall surface parallel base portion, and the cross-sectional defect rate can be secured by the protruding base portion.

It is a schematic perspective view of the crack induction joint part concerning one Embodiment of the crack induction joint material of this invention. It is a schematic plan view of the crack induction joint part concerning one Embodiment of the crack induction joint material of this invention. It is a top view of the base member concerning one embodiment of the crack induction joint material of this invention. It is a top view of the connection member concerning one embodiment of the crack induction joint material of this invention. It is a top view of the connection state according to one Embodiment of the crack induction joint material of this invention corresponding to different wall thickness. It is the top view of the splicing connection state provided with different connection parts, the top view of a connection member, and the top view of a base member concerning other embodiment of the crack induction joint material of this invention.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
The crack-inducing joint material 10 of the present invention is provided in a crack-inducing joint part A, which is a place where a crack is artificially generated in a concrete structure, so that the cross-sectional defect in the wall thickness direction of the concrete structure at this A part This is to set the rate to 37.5% or more necessary for inducing cracks.

In this crack-inducing joint A, for example, concrete panels 1 and 1 are disposed at both ends in the wall thickness direction at intervals of the wall thickness, and the vertical main bar 2 and the horizontal distribution bar 3 are provided inside thereof. A reinforcing reinforcing bar 4 is provided, and a decorative joint material 5 is attached to the inside of the concrete panel 1. In order to induce cracks, a substantially Ω-type crack-inducing joint material 6 is provided between the decorative joint material 5 and the reinforcing steel bars 4 of the concrete panel 1, and the concrete wall sandwiching the crack-inducing joint material 6 and the reinforcing steel bars 4 The crack-inducing joint material 10, 10A of the present invention is disposed on the inner side, and the height d1 + d2 of the crack-inducing joint material 10, 10A in the wall thickness direction (and the height 2 · d + decorative joint of the crack-inducing joint material 6). The height 2 · d3) of the material 5 is set so as to have a defect rate that can induce cracks with respect to the total wall thickness D.
In addition, the height in the crack induction joint material 10 and 10A is a dimension of the wall thickness direction of a concrete structure, and means d1, d2, and d3 shown in FIGS.

The crack-inducing joint material 10, 10 </ b> A includes a base member 11 on the outer side in the wall thickness direction that is supported and fixed to the reinforcing reinforcing bars 4, and a connection member 12 that is connected to the base member 11 and connected thereto, and is connected to the base member 11. The member 12 is provided with a connecting portion 13 for connecting the members 12 to each other so that they can be connected.
In this crack-inducing joint material 10, two types (11, 11A) having different heights as the base member 11 and three types (12, 12A, 12B) having different heights as the connecting members 12 are prepared. In addition to using the member 11 alone, these two types of base members 11, 11A and three types of connecting members 12, 12A, 12B are added by connecting portions 13 in any combination (type and number of connections). The height d1 of the connected crack-inducing joint material 10 can be changed.

  The base member 11 is formed in a T shape with a wall surface parallel base portion 14 and a protruding base portion 15 protruding perpendicularly from the center of the wall surface parallel base portion 14. On both sides of the intermediate portion of the base portion 15, convex strips 16 are provided, and on both end portions of the wall surface parallel base portion 14, binding wire mounting holes 17 for fixing to the reinforcing reinforcing bars 4 are formed. For example, it is integrally formed with ABS resin. Further, a substantially isosceles triangular addition convex portion 13 a constituting the connecting portion 13 is integrally formed at the end portion of the protruding base portion 15 of the base member 11.

  Further, on both sides of the projecting base portion 15 of the base member 11, there are provided water-stopping members 18 which are flexible such as butyl rubber and have good adhesion to concrete in order to prevent infiltration due to induced cracks. A release paper is attached in front.

Further, in the base member 11A, the height of the protruding base portion 15 is increased, and the intermediate wall surface parallel portion 14a is integrally provided at the intermediate portion.
The other configurations are the same as those of the base member 11, and the same parts are denoted by the same reference numerals and description thereof is omitted.

  Next, the connecting member 12 is provided with a flat plate-like connecting portion main body 12a, and is provided so as to surround an isosceles triangular concave portion having one end provided with an additional concave portion 13b constituting the connecting portion 13. A flange-like parallel projecting portion is formed on both sides of the opening so that it can also be used as the intermediate wall surface parallel portion 14a, and an additional projection 13a constituting the connecting portion 13 is provided at the other end. . And the protruding item | line part 16 is provided in the intermediate part both sides of the connection part main body 12a, and such a connection member 12 is integrally molded, for example with synthetic resins, such as ABS resin.

  In the connecting members 12A and 12B, the height of the connecting portion main body 12a is changed, and a flexible material such as butyl rubber is used on both sides of the intermediate portion of the connecting portion main body 12a of the connecting member 12 to prevent water from being induced by induced cracks. There is provided a water stop member 18 having good adhesion to concrete and a release paper is attached before construction. Other configurations are the same as those of the connection member 12, and the same parts are denoted by the same reference numerals and description thereof is omitted.

  The crack-inducing joint material 10 that combines the base member 11 and the connection member 12 has a convexity for adding the base member 11A and the connection member 12A to the connection portion 13 as shown in FIGS. The connecting portion 13a is connected to the adding recess 13b, and the connecting protrusion 13a of the base member 11A is slid and connected to the adding recess 13b of the connecting member 12A. It can be connected so as not to come off.

According to such a crack-inducing joint material 10, the height in the wall thickness direction can be easily increased by the height of the connecting member 12A, compared with the case where the base member 11A is used alone, and the base can be stored. What is necessary is just to carry out in the state which isolate | separated the member 11A and the connection member 12A, and ensuring of a storage space also becomes easy.
Further, the crack-inducing joint material 10B is higher in height than the crack-inducing joint material 10, and is constituted by adding a connecting member 12B. That is, in this crack-inducing joint material 10B, the base member 11A and the connection members 12A and 12B are added to each other, and the extension protrusion 13a of the connection member 12A and the extension recess 13b of the connection member 12B are slid. It is connected by connecting and connected so that it does not come off in the wall thickness direction.
According to such a crack-inducing joint material 10B, the height in the wall thickness direction can be easily increased by the height of the connecting members 12A and 12B as compared with the case where the base member 11A is used alone, and stored. The base member 11A and the connection members 12A and 12B may be separated from each other, and the storage space can be easily secured.

  In addition, although two embodiment was demonstrated here as an example, it is not restricted to these examples, As a crack induction joint material, selecting the combination (a kind and connection quantity) of a base member and a connection member arbitrarily. Thus, the height in the wall thickness direction can be changed, and the cross-sectional defect rate that can induce cracks according to the wall thickness of the concrete structure can be easily ensured.

Next, the crack induction joint material 20 in which the shape of the connecting portion is changed will be described with reference to FIG. Note that the same parts as those of the crack-inducing joint materials 10, 10A, 10B already described are denoted by the same symbols, and redundant description is omitted.
The crack-inducing joint material 20 includes a base member 21 and a connection member 22 connected to the base member 21, and the base member 21 and the connection member 22 are connected by connecting portions 23. The connecting portion 23 is constituted by an additional convex portion 23a and an additional concave portion 23b, and can be connected by sliding. The additional convex portion 23a is a substantially elliptical shape that connects the semicircles on both sides with a plane. The additional recess 23b is formed of a substantially elliptical recess that can surround the outer side of the approximately elliptical shape, and an opening corresponding to the thickness of the base member 11 and the connecting member 12 is formed at one end of the recess. It is formed so that it can be connected by sliding.
The other configuration is the same as the crack-inducing joint material already described.

  Also, the base member 21 and the connection member 22 provided with the connection portion 23 are only shown as an example in FIG. 6, those having different heights in the wall thickness direction are prepared, and these are arbitrarily combined. Thus, it goes without saying that the cross-sectional defect rate can be adjusted by changing the height.

As described above, according to the crack-inducing joint material of the present invention, the base member 11 and the connecting member can be added by connecting the connected portion of the connecting member 12 to the connecting portion 13 of the base member 11. By changing the combination with 12, it is possible to easily secure the cross-sectional defect rate corresponding to the wall thickness of the concrete structure with a small number of varieties. Moreover, even if a crack is induced by the water-stopping member 18, water can be stopped due to adhesion with concrete, and corrosion of the reinforcing steel bars 4 due to water immersion can be prevented.
This makes it possible to ensure the required cross-sectional defect rate corresponding to the wall thickness of the concrete structure, avoiding problems in storage that require new equipment and storage due to an increase in variety. be able to.
Further, by connecting the connecting portion 13 by sliding the connecting portion 13 with the concavo-convex portions 13a and 13b, the connecting portion 13 can be easily added and can be reliably connected.
Furthermore, a plurality of connecting members 12 and 12 can be connected and added, the correspondence to the change in the thickness of the concrete wall can be further improved, the number of connecting members 12 is reduced, and the quantity used is reduced. It can be changed to a corresponding unit.
In addition, the wall surface parallel base portion 14 can be easily supported and fixed to the reinforcing steel bars 4 and the like, and the protruding base portion 15 can ensure a cross-sectional defect rate.

  In addition, the crack-inducing joint material may be slid and connected after applying an adhesive for prevention of slipping out when connecting at the connecting portion. After the adhesive has hardened, it is connected and connected more firmly. be able to.

1 Formwork for placing concrete 2 Reinforcing bars (main bars)
3 Reinforcing bars (distribution bars)
4 Reinforcing bar 5 Makeup jointing material 6 Induction jointing material (for outside of reinforcing steel bar)
10, 10A, 10B, 20 Crack-inducing joint material 11, 11A, 21 Base member 12, 12A, 12B, 22 Connection member 12a Connection portion body 13, 23 Connection portion 13a, 23a Extension protrusion 13b, 23b Extension recess 14 Wall surface parallel base part 14a Intermediate wall surface parallel part 15 Projection base part 16 Projection part 17 Mounting hole 18 Water stop member A Crack-inducing joint

Claims (4)

A crack-inducing joint material that is embedded along the wall thickness direction of a concrete structure and causes a cross-sectional defect to induce a crack,
A base member which is arranged on the inner side of the reinforcing steel bar in the wall of the concrete structure and whose one end is supported and fixed to the reinforcing steel bar and a connecting portion is provided at the other end, and connected to the connecting portion of the base member The connecting member is connected to the base member and the connecting member, and the base member and the connecting member are provided with a water-stopping member that is brought into close contact with the concrete to stop the water. Crack-induced joint material.   2. The crack-inducing joint material according to claim 1, wherein the connection portion is constituted by an addition concave portion and an addition convex portion, and is configured to be slidable and connectable.   3. The connection member according to claim 1, wherein a connection portion is formed at the other end portion in addition to the connection portion at one end portion, and a plurality of connection members are added to be connectable. Crack-induced joint material. The said base | substrate member was comprised in the substantially T shape by the wall surface parallel base part in alignment with a concrete wall surface, and the protrusion base part protruded in the wall thickness direction from this wall surface parallel base part. The crack induction joint material in any one.

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