JPH08209813A - Waterproof crack inducing joint structure - Google Patents

Abstract

PURPOSE: To expect both the induction of cracks and the waterproof effect and dispense with the installation of a water stop plate by forming an inducing member into a waterproof structure. CONSTITUTION: A crack inducing member 13 is installed on the inside of a crack inducing joint 12 provided in the longitudinal direction of a wall-shaped structure 11. The crack inducing member 13 is constituted of a pair of plates 14, 14 and an elastic water stop material 15 held between the plates 14, 14. The crack inducing member 13 is installed so that the water stop material 15 is faced to the bottom face 12a of the crack inducing joint 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof crack-inducing joint structure for inducing cracks in a concrete wall-shaped structure or the like at a required location and controlling the occurrence of cracks in other portions. It is about.

[0002]

2. Description of the Related Art Cracks in a wall-shaped structure or the like are controlled by providing joints that partially reduce the cross-sectional area at regular intervals in the longitudinal direction of the structure and inducing cracks in the joints. .

FIGS. 4 and 5 show an example of a conventional crack-inducing joint structure. In the longitudinal direction of the wall-shaped structure 1, a reduced cross-section part is formed by grooves having a trapezoidal flat cross-section at regular intervals. Is provided, and the groove is used as a crack-inducing joint 2. A crack inducing member 3 made of a synthetic resin plate, an iron plate, or the like is installed in the structure inside the inducing joint 2 so as to be positioned at a right angle to the bottom surface 2a of the inducing joint 2, and further waterproof behind the inducing member 3. The plate 4 is installed in the longitudinal direction. In addition, 5 shows a main muscle and 6 shows a distribution muscle.

[0004]

In such a conventional structure, the structure 1 is constructed by the induction joint 2 and the induction member 3 described above.
Then, cracks 7 are induced at regular intervals, which controls cracks in other parts. The cracks 7 may be post-treated by injection of waterproof mortar or the like, but the cracks 7 may occur beyond the waterproof plate 4 to a deep portion of the structure 1. In such a situation, the effect as the waterproof plate 4 is lost, and the cracks 7 caused are induced.
As a result, the waterproofness of the structure 1 is impaired.

The present invention was conceived in order to solve the above-mentioned conventional problems, and its purpose is to expect both crack induction and waterproof effect by forming the induction member in a waterproof structure. Another object of the present invention is to provide a waterproof crack-inducing joint structure having a new structure that does not require installation of a water stop plate.

[0006]

The present invention according to the above object provides an elastic member sandwiched between a required pair of plates and inside a crack-inducing joint provided in the longitudinal direction of a wall-shaped structure. A crack inducing member consisting of a water blocking material having, and the water blocking material being placed on the bottom surface of the induced joint and installed.
That is.

As the plate member of the inducing member, a synthetic resin plate, a metal plate or the like can be adopted, and the outer surface of the structure in contact with concrete is formed into a rough surface or an uneven surface of an arbitrary shape. However, an adhesive may be applied to the outer side surface for the purpose of increasing the adhesive force between the plate body and the concrete. Further, the inner side surface is a flat surface, but it is preferable that the installation portion of the water blocking material is formed in a state conforming to the cross-sectional shape of the water blocking material.

The water blocking material is most preferably made of butyl rubber, but may be made of other synthetic rubber, synthetic natural rubber or the like. The water blocking member is adhered to the inner side surfaces of the pair of plate bodies and is sandwiched between the plate bodies, and the plate bodies are watertightly closed to prevent water leakage. For the purpose of preventing water leakage, the waterproofing material may be applied in a sandwich shape in the central part between the plates, but in order to maintain the balance of the inducing member when embedding it in concrete, there are two places before and after the plates. It is most preferable to apply them in parallel.

[0009]

[Operation] In the above structure, the inducing member has flexibility with respect to external pressure due to the elasticity of the water blocking material between the plates. Therefore, at the time of installation, the waterproof material is located inside the induced joint with the concrete pressure being compressed to some extent by the concrete pressure. Also, due to the flexibility of the induction member, cracks are easily induced in the induction joint. When a crack is induced, the external pressure on the inducing member is relieved, and the waterproof material expands due to elastic recovery and reaction with water accordingly, so that the pair of plates move outward following the crack. The space between plates expands. However, since the space between the plates is closed by the waterproofing material, rainwater that has entered the cracks from the joints is prevented from entering the interior by the waterproofing material, and the cracks are induced deep into the structure. However, there is no risk of water leakage.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Each of FIGS. 1 to 3 shows an embodiment of the present invention, in which 11 is a concrete wall-shaped structure, and 12 is crack induction provided at regular intervals in the longitudinal direction of the structure 11. It is a joint. This induction joint 12 has a trapezoidal flat cross section,
It is formed by a triangular groove, and a crack inducing member 13 is installed in concrete inside the groove.

The inducing member 13 is made of a synthetic resin and has a pair of plate members 14 and 14 each having an uneven outer surface, and the plate member 14.
It is composed of an elastic water blocking material 15, 15 made of butyl rubber, which is adhered and sandwiched along the edges at both ends between, and one of the water blocking materials 15 is installed on the bottom surface 12a of the induction joint 12 so as to face each other. is there.

The inducing member 13 is the main bar 1 of the structure 11.
6 and the reinforcement bars 17 are laid vertically for each position of the induction joints 12 before the concrete is placed after the reinforcement, and although not shown in the figure, they are held by appropriate means. At this time, it is advisable to seal the upper and lower openings of the inducing member 13 so as to prevent the space between the plates from being filled by the intrusion of the poured concrete.

In the inducing member 13 embedded in the cast concrete, the water-inducing material 15, 15 between the plate bodies is itself formed.
Since it has flexibility with respect to external pressure due to its elasticity, it is located inside the induction joint 12 in a state of being contracted to some extent by concrete pressure. However, when cracking occurs due to a change in the temperature of the concrete, the flexibility of the inducing member 13 does not hinder the induction of the crack 18 by the inducing joint 12, but rather the cracking is induced in cooperation with the inducing joint 12. Make it easier.

When the crack 18 is induced, the external pressure on the inducing member 13 is alleviated accordingly, and the water blocking material 1
5 and 15 expand due to elastic recovery and reaction with water. As a result, the pair of plates 14, 14 follow the crack and move outward to expand the space between the plates. However, since the space between the plates is closed by the water blocking materials 15 and 15, the cracks 17 are blocked by the water blocking materials 15 and 15 on the way, and the infiltration of water from the induced joint 12 to the cracks 17 occurs. It is blocked by the part and does not infiltrate the inside of the inducing member 13.

3A and 3B exemplify another structure of the inducing member 13, and FIG. 3A shows that both inner end portions 14a of the plate members 14 and 14 are formed in a step portion and a cross section is formed between the step portions. The figure shows an example in which a quadrangular waterproof material 15 is fitted and sandwiched by adhesion.
FIG. 3B shows an example in which both inner end portions 14a of the plate bodies 14 and 14 are formed into inclined surfaces, and a water blocking material 15 having a triangular cross section is fitted and sandwiched between the step portions. (C) The figure shows a semicircular vertical groove 14b, 1 at a facing position inside the plate 14, 14.
4b is provided, and a water blocking material 15 having a circular cross section is fitted between the vertical grooves and bonded and sandwiched. In these examples, the water blocking members 15 and 15 fit well, and the inducing member 13 has a good balance, so that it is easy to handle.

The embodiment is described by partially showing a half part of a wall-shaped structure, and the above-mentioned induction joint and induction member are provided at the same position on both sides of the structure as in the conventional case. As a matter of course, the present invention is not limited to those described in the embodiments.

[0017]

As described above, according to the present invention, a pair of plate bodies and an elastic water blocking material sandwiched between the plate bodies are provided inside a crack-inducing joint provided in a wall-shaped structure. Since a crack inducing member is installed, the flexibility of the inducing member and the inducing joint improve the effect of inducing cracks more than the conventional structure. The amount used is also reduced.

Further, since the water blocking material of the inducing member blocks the induced cracks, the infiltration of water does not proceed to the inside of the inducing member, so that it is not necessary to install the water blocking plate, which is required in the conventional structure, and the cost required for installation Saves time and effort.

The inducing member is simple because it can be constructed simply by sandwiching a water blocking material having an appropriate elasticity between a pair of plates, and it is easy to handle because it does not require any special labor for maintenance and installation. Have.

[Brief description of drawings]

FIG. 1 is a plan sectional view of an embodiment of a waterproof crack-inducing joint structure according to the present invention.

FIG. 2 is a plan sectional view for explaining a crack inducing state of the above.

3 (A), (B), and (C) are partial perspective views of an embodiment of a crack inducing member having a different plane sectional structure.

FIG. 4 is a plan sectional view of an example of a conventional crack-inducing joint structure.

FIG. 5 is a plan sectional view for explaining a crack inducing state of the same.

[Explanation of symbols]

 11 Wall-like structure 12 Crack-inducing joint 13 Crack-inducing member 14 Plate 15 Water-stopping material

Claims (1)

[Claims] 1. A crack inducing device comprising a required pair of plates and an elastic water blocking material sandwiched between the plates inside a crack inducing joint provided in the longitudinal direction of a wall-shaped structure. A waterproof crack-inducing joint structure, characterized in that the above-mentioned waterproofing material is placed on the bottom surface of the inducing joint and the member is installed.