JP2011236639A - Water cut-off structure applicable to induced crack, water cut-off member used therefor, and construction method of the water cut-off structure applicable to induced crack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cut-off structure applicable to an induced crack, capable of ensuring high performance cut-off with a reduced work load during construction and subsequent maintenance.SOLUTION: A water cut-off structure 1 applicable to induced crack comprises a wall body 2 as a concrete building body having four water cut-off members 4 buried along a virtual line 5 connecting crack inducing joints 3 and 3 formed on the surface, approximately perpendicular to the surface. The water cut-off member 4 comprises a cement as material that produces an insoluble substance by reaction with water, a siliceous powder as a crystal breeding material, and dihydrate gypsum and blast-furnace slag fine powder as an expandable material.

Description

  The present invention relates to a water-stopping structure for induced cracks mainly applied to a concrete structure having a large cross section, a water-stopping member for induced cracks used therefor, and a method for constructing a water-proof structure for induced cracks.

  When cracks occur in a concrete structure, not only does the appearance deteriorate, but rainwater permeates through the cracks, causing corrosion of the reinforcing bars, and carbon dioxide in the air promotes neutralization of the concrete. Causes corrosion.

  On the other hand, concrete structures are prone to cracking due to shrinkage deformation due to temperature changes after concrete placement and drying due to moisture evaporation, and sufficient consideration was given to concrete composition, placement method, and curing after placement. Even so, there are limits to the suppression of cracking, and it is difficult to completely prevent cracking.

  Therefore, by providing a cross-sectional defect portion in the concrete structure, a measure for systematically generating cracks in the cross-sectional defect portion has been widely performed.

  The cross-sectional defect part is widely used as an arrangement configuration in which a crack-inducing joint consisting of a groove-shaped or notch-shaped concave part is formed on the surface side of the housing, and a cross-sectional defect member made of a steel plate or the like is embedded behind it In the configuration, the crack can be guided and controlled along the path connecting the crack-inducing joint and the cross-sectional defect member or along the extension line.

  By the way, when the cross-sectional dimension of the concrete structure is increased, a large tensile stress is generated near the center of the cross section due to the internal restraint caused by the temperature rise due to the heat of hydration of the cement accumulated in the frame and the subsequent temperature drop. With the arrangement configuration, it becomes difficult to efficiently generate cracks in a concentrated manner.

  In such a case, it is desirable to dispose the cross-sectional defect member in the vicinity of the center of the cross-section, and to configure the cross-sectional defect part so that the total cross-sectional defect rate with respect to the wall thickness is 20% or more, preferably 25% or more. ("Shrinkage crack control design / construction guidelines (draft) / commentary explanation for reinforced concrete buildings", edited by Architectural Institute of Japan, published on February 10, 2006).

JP 2004-346559 A JP 2001-140363 A JP 2000-008309 A JP-A-7-207774

  Here, it is indispensable to take countermeasures against water to prevent rebar corrosion due to intrusion of water for cracks that have occurred systematically. By filling with concrete or resin mortar, it is possible to prevent water from entering from the surface side of the concrete frame, or by embedding in the concrete frame in such a way that a water-stopping material made of butyl rubber or the like is attached to the cross-section defect member. Measures have been adopted as appropriate to block water that has entered from the surface of the housing at a predetermined cross-sectional position.

  However, filling a crack-inducing joint with a sealing material or resin mortar not only requires work and experience, but also requires repair and replacement due to deterioration over time, which is a complicated countermeasure against water stoppage.

  In addition, as for water stoppage measures in the concrete frame, the surface of the water-stopping material such as butyl rubber is an adhesive surface, which ensures adhesion with the placed concrete. Until then, the surrounding dust adhered to the surface of the water-stopping body to reduce the adhesiveness, and as a result, there was a problem that good adhesion could not be expected with the placed concrete.

  In addition, even if adhesion to concrete can be secured at the beginning of construction, there is a concern that the adhesion between the water-stopping material and concrete will break as the induced crack progresses, and due to the nature of materials such as butyl rubber, There has also been a problem that a decrease in water stoppage due to deterioration cannot be avoided.

  The above-mentioned problems apply to concrete structures with general cross-sectional dimensions. However, in concrete structures with large cross-sectional dimensions, the temperature rise due to heat of hydration increases, so the scale of induced cracks increases, preventing cracks. Water measures become more important.

  The present invention has been made in consideration of the above-described circumstances, and is capable of preventing water from induced cracks that can ensure high water-stopping properties against induced cracks while reducing the burden of maintenance work during and after construction. It is an object of the present invention to provide a structure, a water-stopping member for induced cracks used therefor, and a method for constructing a water-proof structure for induced cracks.

In order to achieve the above-described object, the water-stop structure for induced cracks according to the present invention is a concrete enclosure that is substantially perpendicular to the surface thereof and passes through a crack-induced joint formed on the surface. In the water-stopping structure of induced cracks with a water-stopping body embedded on or near the imaginary line,
The waterstop is configured to contain an insoluble substance generating material that reacts with water to generate an insoluble substance.

  In addition, the water-stop structure for induced cracks according to the present invention includes a crystal growth that produces the insoluble substance-generating material, a cement, a latent hydraulic inorganic material having expandability, and water and cement in an environment where the cement exists. It consists of materials.

  Further, in the water-stop structure for induced cracks according to the present invention, the insoluble substance-generating material is composed of a concrete expansion material and a crystal growth material that generates crystals in an environment where water and the concrete expansion material exist. Is.

  In the water-stop structure for induced cracks according to the present invention, the insoluble substance generating material is composed of cement and a crystal growth material that generates crystals in an environment where water and cement exist.

  Further, in the water-stop structure for induced cracks according to the present invention, the water-stopping body is formed on the back side of the crack-induced joint, between the crack-induced joint and the cross-sectional defect member embedded along the virtual line, or the cross-section. It is positioned between the missing members.

In addition, the water-stopping member for induced cracks according to the present invention is a concrete enclosure, as described in claim 6, which is substantially perpendicular to the surface thereof and on or near an imaginary line passing through a crack-inducing joint formed on the surface. In the water-stopping member for induced cracks embedded in
It is formed so as to contain an insoluble substance generating material that reacts with water to generate an insoluble substance.

  Further, the water-stopping member for induced cracking according to the present invention is characterized in that the insoluble substance generating material is a crystal growth that produces a crystal in an environment in which cement, a latent hydraulic inorganic material having expandability, water and cement exist. It consists of materials.

  Further, in the water-stopping member for induced cracking according to the present invention, the insoluble substance generating material is composed of a concrete expansion material and a crystal growth material that generates crystals in an environment where water and the concrete expansion material exist. Is.

  In the water-stopping member for induced cracking according to the present invention, the insoluble substance generating material is composed of cement and a crystal growth material that generates crystals in an environment where water and cement exist.

In addition, the water-stopping member for induced cracks according to the present invention is a concrete skeleton that is substantially perpendicular to the surface thereof and on or near an imaginary line passing through a crack-inducing joint formed on the surface. In the water-stopping member for induced cracks embedded in
It consists of a plate-like main body formed into a plate shape containing an insoluble substance generating material that reacts with water to generate an insoluble substance, and a plate-like or sheet-like reinforcing material embedded in the plate-like main body. .

  Further, the water-stopping member for induced cracking according to the present invention is characterized in that the insoluble substance generating material is a crystal growth that produces a crystal in an environment in which cement, a latent hydraulic inorganic material having expandability, water and cement exist. It consists of materials.

  Further, in the water-stopping member for induced cracking according to the present invention, the insoluble substance generating material is composed of a concrete expansion material and a crystal growth material that generates crystals in an environment where water and the concrete expansion material exist. Is.

  In the water-stopping member for induced cracking according to the present invention, the insoluble substance generating material is composed of cement and a crystal growth material that generates crystals in an environment where water and cement exist.

  Moreover, the water stop member for induced cracks according to the present invention is such that a part of the reinforcing material protrudes from the edge of the plate-like body as an exposed edge in the in-plane direction.

  In addition, as described in claim 15, the construction method for the induced crack water stop structure according to the present invention is a method for constructing a water stop structure for the induced crack using the water stop member for the induced crack according to claim 14. The joint material for forming the crack-inducing joint is composed of a pair of joint pieces arranged in contact with each other in parallel, and the exposed edge of the reinforcing member is wound around one of the pair of joint pieces. In addition, the edge portion of the plate-like main body is sandwiched between them, and in this state, the pair of joint pieces are fixed to the back surface of the dam plate for constituting the concrete frame, and then the concrete is placed inside the dam plate. And after the concrete is hardened, the pair of joint pieces are removed.

  Moreover, the construction method of the induced crack water stop structure according to the present invention is to cut out a portion of the plate-like body that protrudes from the crack-induced joint after the concrete is hardened.

  In the water-stop structure for induced cracks according to the present invention, the water-stopper embedded in the concrete frame is configured to contain an insoluble substance generating material that reacts with water to generate an insoluble substance.

  In this way, cracks are induced in the concrete frame in the vicinity of the waterstop, and when water enters through the cracks, the insoluble substance-generating material contained in the waterstop produces insoluble substances in the induced cracks. , Block the cracks to prevent water from entering.

  Insoluble material generating materials are, for example, hydraulic inorganic materials such as cement, latent hydraulic inorganic materials having expansibility (hereinafter simply referred to as expansive materials), environments where water and cement exist, or expansion for water and concrete One or more of a group consisting of a crystal growth material (hereinafter simply referred to as a crystal growth material) that produces crystals in the environment where the material is present and a concrete expansion material react with water to form an insoluble material. As long as is generated, it can be arbitrarily selected and configured.

  As the crystal growth material, for example, a siliceous fine powder used as a crystal growth material of self-healing concrete can be used.

  In addition, so-called self-healing concrete is a structure in which crystals are chain-generated by a crystal growth material and self-healing cracks generated in the concrete frame by the crystal, whereas in the present invention, the crystal growth material Is not a self-healing, but in that sense, the water-stopping structure of the induced crack according to the present invention is not a self-healing body. It can be said that it is completely different from healing concrete.

  The expansive material is an expansive inorganic material that does not proceed with water alone, but produces crystals in the presence of water and cement, and includes gypsum (anhydrous gypsum and dihydrate gypsum) and blast furnace slag. Fine powder shall be included.

  Such an expandable material has a higher reaction rate than a crystal growth material composed of a siliceous fine powder or the like, and therefore exhibits an early water-stopping property against induced cracks.

  Since concrete expansion materials quickly generate crystals in the induced cracks by reaction with water, the water-stopping effect against the induced cracks is demonstrated at an early stage prior to the water-stopping action by the crystal growth material, just like the expandable materials. The

The insoluble substance generating material is, for example,
(a) Cement, expandable material and crystal growth material
(b) Concrete expansion material and crystal growth material
(c) Cement and crystal growth material
(d) It can be composed of a hydraulic inorganic material such as cement.

  Here, in the case of (a), the cement reacts with water to generate a hydrate, and the calcium hydroxide generated by the hydration reaction at that time is expanded together with the cement into an expandable material or a crystal growth material. React with each other to produce crystalline substances, and these insoluble substances block the induced cracks and exhibit water-stopping properties.

  In the case of (b), the concrete expansion material reacts with water to produce a hydrate, and the calcium hydroxide generated by the hydration reaction at that time is combined with the concrete expansion material and the crystal growth material. Crystals are produced by the reaction, and these insoluble substances block the induced cracks and exhibit water-stopping properties.

  In the case of (c), the cement reacts with water to produce a hydrate, and the calcium hydroxide generated by the hydration reaction at that time reacts with the crystal growth material together with the cement to produce a crystalline substance. These insoluble substances block the induced cracks and exhibit water-stopping properties.

  In the case of (d), a hydrate is produced by the reaction of the hydraulic inorganic material with water, and this hydrate closes the induced cracks and exhibits water-stopping properties.

  As mentioned above, the waterstop can be embedded in the concrete frame at any location as long as it is on or near the imaginary line passing through the crack-inducing joint formed on the surface substantially perpendicular to the surface of the concrete frame. For example, it is possible to position the back side of the crack-inducing joint, between the cross-sectional defect member and the crack-inducing joint, or between the cross-sectional defect members.

  Whether or not the cross-sectional defect member is used together is arbitrary, and when the cross-sectional defect part is constituted only by the crack inducing joint, the waterstop body may be positioned on the back side of the crack inducing joint.

In addition, as long as the waterstop contains an insoluble substance generating material and is finally formed so that water can come into contact with the insoluble substance generating material, the form and installation method at the time of installation are arbitrary. ,
(i) It is configured as a solid material solidified into a block shape, a plate shape, etc. with a predetermined binder (binder) while applying a compressive force as necessary, and this is fixed at a desired position in the concrete placement area. Then cast concrete.
(ii) Mix in a prescribed solvent to form a liquid material, apply this to the core, and then place the concrete
(iii) After placing concrete so that the waterstop embedment remains as a hollow space, and after the concrete is hardened, the liquid material described above via a tube or the like if necessary in the hollow space remaining in the concrete frame It is possible to adopt a form or an installation method such as filling and solidifying.

  The water-stopping member for induced cracks according to the present invention is formed so as to contain an insoluble substance generating material that reacts with water to produce an insoluble substance, or an insoluble substance that reacts with water to produce an insoluble substance. It consists of a plate-like main body containing a generating material and formed into a plate shape, and a plate-like or sheet-like reinforcing material embedded in the plate-like main body.

  In this way, when a crack is induced in the concrete frame in the vicinity of the water-stopping member for induced cracking, and when water enters through the crack, the insoluble material generating material contained in the water-stopping member for induced cracking is induced. An insoluble material is generated in the crack, and the crack is closed to prevent water from entering.

  The insoluble substance generating material reacts with one or more kinds of a group consisting of a hydraulic inorganic material such as cement, an expandable material, a crystal growth material, and a concrete expansion material to produce an insoluble material. It can be arbitrarily selected and configured as long as possible. Hereinafter, since the insoluble substance generating material, the hydraulic inorganic material, the expansive material, the crystal growth material, and the concrete expansion material constituting the same are the same as those in the above-described water-stopping structure, the description will be given here. Omitted.

  The water-stopping member for induced cracks can be embedded in the concrete frame at any location as long as it is on a virtual line that is substantially perpendicular to the surface of the concrete frame and passes through the crack-inducing joint formed on the surface. It is possible to arrange the crack-inducing joint at the back side, between the crack-inducing joint and the cross-section defect member, or between the cross-section defect members.

  The water-stopping member for induced cracks can be provided with sufficient water-stopping properties even for induced cracks that are slightly deviated from the imaginary line by arranging them perpendicularly to the imaginary line described above. If there is a high possibility that a crack is formed along the imaginary line, it may be arranged parallel to the imaginary line.

  Incidentally, in such a case, since the water-stopping member for induced cracks according to the present invention can function as a cross-sectional defect member, it is not necessary to separately embed a cross-sectional defect member formed of steel or the like.

  The water-stopping member for induced cracking is configured as a solid material solidified into a block shape, plate shape, etc. with a predetermined binder (binder) while applying a compressive force as required, and this is desired in the concrete placement region It is sufficient to fix concrete at the position and cast concrete.

  When solidifying using a hydration reaction between cement and water, the composition is adjusted so that the amount of each constituent material is larger than the amount of water, or the particle size of each constituent material is increased. By doing so, each constituent material of the insoluble substance generating material is left as an unreacted component.

  Here, when the binding material is, for example, a water-soluble thermoplastic resin, when water enters through induced cracks, the binding material is dissolved by the water, and the contained insoluble substance generating material comes into contact with water. Thus, since the reaction starts, it is possible to reliably exhibit water-stopping against induced cracks.

  When the water stop member for induced cracks according to the present invention is composed of a plate-like main body and a plate-like or sheet-like reinforcing material embedded in the plate-like main body, at least a part of the reinforcing material is plate-like. It is sufficient if it is embedded in the main body, and there may be a portion exposed from the plate-shaped main body, or the whole may be embedded in the plate-shaped main body. For example, it includes a laminated structure (three-layer structure) in which a reinforcing material is sandwiched between plate-like main bodies, and a case where the thickness portion at the periphery of the reinforcing material is exposed.

  Here, if a part of the reinforcing material is projected from the edge of the plate-like body as an exposed edge in the in-plane direction of the plate-like body, the exposed edge is attached to a dam plate or the like. In addition, the water-stopping member for induced cracks can function as a means for securely and accurately fixing the water-stopping member for the desired crack in a desired position in the concrete frame.

  Although the method for constructing the water-stopping structure for the induced crack using the water-stopping member for the induced crack according to the present invention is arbitrary, for example, joint materials for forming a crack-inducing joint are disposed in parallel with each other. It is composed of a pair of joint pieces, and the exposed edge portion of the reinforcing material is wound around one of the pair of joint pieces and the edge portion of the plate-like body is sandwiched between them, and in this state, the pair of joint pieces are Fix to the back of the dam plate (the surface on which the concrete is placed) to form the concrete frame, and then place the concrete inside the dam plate, after the concrete is cured, a pair of joint pieces The method of removing can be adopted.

  Here, after hardening of concrete, you may make it cut out the part which protrudes from a crack induction joint among plate-shaped main bodies as needed.

The horizontal sectional view which showed the water stop structure of the induced crack which concerns on this embodiment. The horizontal sectional view which showed the water stop structure of the induced crack which concerns on a modification. The horizontal sectional view which showed the water stop structure of the induced crack which concerns on another modification. The whole perspective view of the water stop member for induction cracks concerning this embodiment. It is a figure of the water stop member for induction cracks similarly concerning this embodiment, (a) is a front view, (b) is a sectional view which meets an AA section. The figure which showed the construction | assembly procedure of the induced crack water stop structure which concerns on this embodiment. The figure which showed the construction procedure of the induced crack water stop structure which concerns on this embodiment continuously. The whole perspective view of the water stop member for induction cracks concerning a modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a water-stop structure for induced cracks according to the present invention, a water-stop member for induced cracks used therefor, and a method for constructing a water-proof structure for induced cracks will be described with reference to the accompanying drawings.

(First embodiment)

  FIG. 1 is a horizontal cross-sectional view showing a water-stopping structure for induced cracks according to the first embodiment. As can be seen from the figure, the water-stop structure 1 for induced cracks according to the present embodiment is a wall 2 as a concrete frame, which is substantially perpendicular to the surface of the wall 2 and formed on the surface. A total of four waterstops 4 are embedded on an imaginary line 5 that connects the cross-section defect member 6 disposed on the back side of the crack-inducing joint 3 and in the vicinity of the surface of the wall 2. Is positioned between the cross-sectional defect member 7 and the cross-sectional defect member 6 embedded in the center of the cross section of the wall body 2 along the virtual line 5.

  What is necessary is just to comprise the cross-sectional defect member 6 and the cross-sectional defect member 7 using a steel plate, for example.

  The waterstop 4 contains cement, siliceous fine powder as a crystal growth material, and dihydrate gypsum and blast furnace slag fine powder as inflatable materials as constituent components of the insoluble substance generating material.

  Here, when a crack is induced in the wall body 2, the cement quickly reacts with water that has entered through the induced crack to generate a hydrate that is an insoluble substance, and blocks the induced crack. In the presence of water from induced cracks and unhydrated cement, dihydrate gypsum and fine powder of blast furnace slag, which are expansive materials, form crystals that are insoluble matter and expand, and similarly induce induced cracks. Block it.

  On the other hand, the siliceous fine powder which is a crystal growth material has been entrained in water from induced cracks, unhydrated cement and water supplied through or induced by hydration of the cement. By reacting with the calcium hydroxide in the wall 2, crystals that are insoluble substances are generated and proliferated over a long period of time, and induced cracks are blocked.

  That is, cement, expansive material dihydrate gypsum and blast furnace slag fine powder, and siliceous fine powder generate and grow an insoluble substance in the cracks induced in the wall 2, thereby preventing the induced cracks. Although it exhibits water-stopping properties, cement exhibits water-stopping properties in the form of rapid hydrate formation against intrusion water via induced cracks, while expansive materials compare in subsequent forms. On the other hand, the siliceous fine powder exerts the water-stopping property in such a manner that the crystals grow gently over a long period of time.

  Therefore, the cracks induced in the wall 2 complement each other with the synergistic action of cement, dihydrate gypsum and blast furnace slag fine powder, which are expansive materials, and siliceous fine powder, especially when waterstop is exerted. Due to the synergistic action, the water-stopping property is ensured over a long period of time.

  In order to manufacture the waterstop body 4, it is possible to appropriately employ a known method used when solidifying a powder material or a granular material into a block shape, and to form a block shape using an appropriate binder (binder). What is necessary is just to solidify.

  In order to construct the water-stopping structure 1 for induced cracks using the water-stopping body 4, a joint material (not shown) for forming the crack-inducing joints 3 and 3 is fixed to the back surface of the dam plate (not shown). At the same time, the waterstop body 4, the cross-sectional defect member 6 and the cross-sectional defect member 7 are fixed to a dam plate or a reinforcing bar, using an attachment jig as necessary, and after concrete is placed in such a state, the concrete is hardened. Waiting for the dam and joint material to be removed.

  In this way, along with the shrinkage deformation of the placed concrete, the imaginary line 5 is applied to the wall 2 due to the cooperative action of the crack-inducing joints 3, 3, the cross-sectional defect members 6, 6 and the cross-sectional defect member 7. , But when water enters through the induced crack, the cement reacts quickly with the invaded water to form an insoluble substance, hydrate, which causes the induced crack. In addition, the dihydrogypsum and ground granulated blast furnace slag, which are expansive materials, expand in the presence of water and cement from the induced cracks to form crystals that are insoluble materials and likewise block the induced cracks.

  On the other hand, the siliceous fine powder which is a crystal growth material is the wall 2 which has been entrained in the water from the induced crack, the cement and the water supplied by the hydration reaction of the cement or invaded through the induced crack. By reacting with the calcium hydroxide in it, crystals that are insoluble substances are generated and propagated over a long period of time, and induced cracks are blocked.

  As described above, according to the water-stop structure 1 for induced cracks according to the present embodiment, the cement contained in the water-stopper 4 immediately exhibits water-stop properties against the cracks induced in the wall 2. In addition, dihydrate gypsum and blast furnace slag fine powder, which are expansive materials, also exhibit water-fastness relatively early in the following form, while siliceous fine powder subsequently exhibits water-resistance against induced cracks over a long period of time. .

  In other words, the immediate effect of cement, dihydrate gypsum and fine powder of blast furnace slag and the mild and long-term effect of siliceous fine powder in the early stage of construction of the wall 2 combined with the induced cracks. Thus, the water flow is surely blocked for a long period from the initial stage of the construction of the wall body 2, and thus it is possible to ensure a high water stoppage.

  In this embodiment, cement, dihydrate gypsum and blast furnace slag fine powder as an expandable material, and siliceous fine powder as a crystal growth material are used as an insoluble substance generating material. It is possible to use a concrete expansion material, and to form an insoluble material generating material by arbitrarily combining them as long as it reacts with water and an insoluble material is generated.

  In this embodiment, the waterstop 4 is embedded between the crack-inducing joint 3 and the cross-sectional defect member 6 and between the cross-sectional defect member 7 and the cross-sectional defect member 6, but induced cracking occurs. If it is on the imaginary line 5, the embedding position and the number of embedding of the waterstop body 4 are arbitrary.

  Further, in this embodiment, the waterstop is configured as the waterstop 4 that is separate from the cross-sectional defect members 6 and 7, but the waterstop according to the present invention is known to be embedded in concrete for the purpose of inducing cracks. By covering or laminating an arbitrary surface of the cross-sectional defect member, it is possible to give a high water-stopping property to a crack induced by the cross-sectional defect member.

  FIG. 2 shows a water-stopping structure 21 for induced cracks according to such a modification, and the water-stopping body 22 is laminated on one surface of a cross-sectional defect member 24 arranged in the vicinity of the surface of the wall body 2. At the same time, a waterstop 22 is laminated on one surface of the cross-sectional defect member 25 disposed in the vicinity of the center of the cross section of the wall body 2.

  According to such a configuration, the water blocking body 22 imparts high water blocking properties to the cracks induced by the cross sectional defect member 24 and the cross sectional defect member 25.

  The waterstop 22 is different from the waterstop 4 according to the present embodiment only in that it is not a block shape but a laminated shape, and it is cement as an insoluble substance generating material, dihydrate gypsum which is an inflatable material, and Since the blast furnace slag fine powder and the siliceous fine powder are contained in the same manner and the effects are the same, detailed description of the waterstop 22 is omitted.

  In this embodiment, the waterstop 4 is arranged orthogonally to the virtual line 5 so as to widely cover induced cracks that are slightly deviated from the virtual line. By arranging 4 parallel to the imaginary line 5, it can function as a cross-sectional defect member.

  FIG. 3 shows a water-stopping structure 31 for induced cracks according to such a modified example, in which a water-stopping body 4 is embedded in the vicinity of the surface of the wall 2 in parallel along a virtual line 5, A water blocking body 4 is embedded in the center of the cross section of the wall body 2 along a virtual line.

  According to this configuration, the waterstop body 4 functions as a cross-sectional defect member to induce cracks in the vicinity of the side surfaces, and the waterstop body provides high waterstop properties to the induced cracks.

  Further, in this embodiment, the waterstop body according to the present invention is made into a block-shaped waterstop body 4 and is fixed in advance before placing the concrete so as to be embedded in the concrete frame. The waterstop is not limited to such an installation method. Instead, the concrete is cast so that the waterstop embedded portion remains as a hollow space, and after the concrete is hardened, the waterstop is formed in the concrete. If necessary for the hollow space, an insoluble material generating material that reacts with water to generate an insoluble material, such as cement, dihydrate gypsum and blast furnace slag fine powder, and siliceous fine powder, which are intumescent materials, via a tube or the like. The water stop body according to the present invention may be formed by filling a liquid material containing powder and then solidifying the liquid material.

  In such a configuration, when the solvent of the liquid material is water, after the liquid material is solidified by a hydration reaction, each constituent material of the insoluble material generating material described above remains as an unreacted component, for example, The formulation is adjusted so that each constituent material increases with respect to the amount of water.

(Second Embodiment)

  Next, the water stop member for induced cracks according to the second embodiment will be described.

  FIG. 4 is an overall perspective view showing a water-stopping member for induced cracks according to the present embodiment, and FIG. 5 is a front view and a cross-sectional view. As can be seen from these figures, the induced cracking water-stopping member 41 according to the present embodiment is formed in an elongated shape as a whole, and has a plate-like main body 42 and a sheet-like material embedded in the plate-like main body. It is comprised with the reinforcing sheet 43 as a reinforcing material.

  The plate-like main body 42 contains cement, expansive dihydrate gypsum and blast furnace slag fine powder, and siliceous fine powder as an insoluble substance producing material that reacts with water to produce an insoluble substance. It is configured. In addition, about the water stop function of cement, an expansible material, and a siliceous fine powder, since it is the same as that of 1st Embodiment, the description is abbreviate | omitted here.

  The reinforcing sheet 43 is formed by assembling alkali-resistant glass fibers in a lattice shape, and is disposed at the center of the thickness of the plate-like main body 42 so that the plate-like main body 42 can be reinforced as a core material.

  Here, the periphery of the reinforcing sheet 43 protrudes from the edge of the plate-like main body 42 in the in-plane direction of the plate-like main body as exposed edges 44a, 44a on the long side and exposed edges 44b, 44b on the short side. I'm allowed.

  The induced cracking water-stopping member 41 may be formed to have a width of about 10 cm, a length of about 2 m, and a thickness of about 3 mm, depending on the cross-sectional dimensions of the concrete frame.

  In order to manufacture the water-stopping member 41 for induced cracking, a known method used when a powder material or a granular material is hardened in a block shape can be appropriately employed, and an appropriate binder (binder) is used. Then, the plate-like main body 42 may be solidified, and at that time, the reinforcing sheet 43 may be embedded.

  Here, when the binder is a water-soluble thermoplastic resin, when water enters through the induced cracks, the binder dissolves with the water, and the contained insoluble substance-generating material comes into contact with the water. Since the reaction starts, the water-stopping property against the induced crack can be surely exhibited.

  FIG. 6 is a view showing a procedure for constructing a water-stop structure for induced cracks using the water-stop member 41 for induced cracks, and a joint material 62 used at that time. As can be seen in the figure, the joint material 62 is composed of a pair of joint pieces 61 and 61 that are arranged in contact with each other in parallel and are each in an elongated shape. As will be described later, the joint pieces 61 and 61 are formed so that the entire cross-sectional shape with the edge portion of the water-stopping member 41 for induced cracks sandwiched is the same as the recessed cross-section of the crack-induced joint. It is.

  In order to construct a water-stop structure for induced cracks by using the water-stop member 41 for induced cracks, first, as shown in the figure, first, reinforcement that protrudes in the in-plane direction of the plate-like body from the edge of the plate-like body 42. The exposed edge portion 44 a of the sheet 43 is wound around one of the pair of joint pieces 61 and 61, and the edge portion of the plate-like main body 42 is sandwiched between the joint pieces 61 and 61.

  Next, in this state, the pair of joint pieces 61 and 61 are fixed to the back surface of the dam plate 63 for constituting the concrete frame.

  After the above-described mounting operation is similarly performed on the back surface of the other dam plate of the dam plates 63 and 63, concrete is placed inside the dam plates 63 and 63.

  In the above-described mounting work and concrete placing work, the water-stopping member 41 for induced cracking serves to reinforce the plate-like main body 42 with the reinforcing sheet 43 as a core material, and particularly to increase the out-of-plane bending rigidity of the plate-like main body 42. Therefore, there is no possibility of being damaged by hitting the weir plate 63, the reinforcing bars 64, 65, or the like during the mounting operation or by the input impact at the time of placing concrete.

  Next, after the placed concrete is hardened, the pair of joint pieces 61 and 61 are removed as shown in FIG.

  Here, when the joint pieces 61, 61 are removed, the crack-inducing joint 72 appears on the surface of the wall 73, which is a concrete frame. Therefore, the portion of the induced cracking water-stopping member 41 that protrudes from the crack-inducing joint 72 is a plate. Cut as piece 71.

  In this manner, the induced cracking water-stopping member 41 (strictly speaking, the remaining induced-cracking water-stopping member obtained by removing the plate piece 71 from the induced-cracking water-stopping member 41) is substantially the same as the surface of the wall 73. A crack inducing structure 74 is constructed that is embedded along a virtual line 5 that passes through the crack inducing joints 72, 72 that are orthogonal to each other and that pass through the surface.

  If it does in this way, with the shrinkage deformation of the laid concrete, the water stop member 41 for induced cracks will function as a cross-sectional defect member in combination with the crack-induced joints 72, 72, in the vicinity of the side surface. Causes an induced crack.

  Also, when water enters through the induced crack, the cement reacts quickly with the intruded water to form an insoluble hydrate, plugging the induced crack, and dihydrogypsum, an expansive material. And in the presence of water from the induced cracks and unhydrated cement, the ground granulated blast furnace slag forms crystals that are insoluble materials and expands, as well as plugs the induced cracks.

  On the other hand, the siliceous fine powder which is a crystal growth material is the wall body 73 which has been entrained in the water from the induced crack, the cement and the water supplied by the hydration reaction of the cement or invaded through the induced crack. By reacting with the calcium hydroxide in it, crystals that are insoluble substances are generated and propagated over a long period of time, and induced cracks are blocked.

  As described above, according to the water-stop member 41 for induced cracks and the water-resistant structure 74 for induced cracks using the same according to the present embodiment, the water for induced cracks is prevented from cracking induced in the wall body 73. While the cement contained in the member 41 immediately exhibits water-stopping properties, the dihydrate gypsum and blast furnace slag fine powder, which are expansive materials, also exhibit water-stopping properties in a relatively early form, while silicic fine particles. The powder then exhibits waterstop properties against induced cracks over a long period of time.

  That is, the immediate effect of the cement, dihydrate gypsum and blast furnace slag fine powder in the early stage of the construction of the wall body 73 and the mild and long-term clogging action of the siliceous fine powder are combined to induce induced cracking. Thus, the water flow is surely blocked for a long period from the initial stage of the construction of the wall body 73, and thus it is possible to ensure a high water stoppage.

  Further, according to the water-stopping member 41 for induced cracks according to the present embodiment, the reinforcing sheet 43 is formed of alkali-resistant glass fibers, so that alteration in an alkaline environment can be prevented over a long period of time, and As a result, it is possible to maintain the function as a water blocking member for induced cracks for a long period of time.

  Further, according to the water-stopping member 41 for induced cracking according to the present embodiment, a part of the reinforcing sheet 43 is exposed as edge portions 44a and 44b in the in-plane direction of the plate-like body from the edge portion of the plate-like body 42. Since it is made to project, it becomes possible to attach to the dam plate 63 using the exposed edge portion, and it is possible to accurately and reliably position the induced cracking water-stopping member at a desired position in the wall body 73. Become.

  In this embodiment, the insoluble substance generating material contained in the water-stopping member 41 for induced cracking is cement, dihydrate gypsum and blast furnace slag fine powder as an expandable material, and siliceous fine powder as a crystal growth material. However, as an insoluble substance generating material, it is possible to further use an expansion material for concrete, and as long as an insoluble substance is generated by reacting with water, an insoluble substance generating material is arbitrarily combined. It is possible to configure.

  Further, in the present embodiment, the induced cracking water-stopping member 41 is embedded in the vicinity of the surface of the wall body 73. However, the induced-cracking water-stopping member 41 functioning as a cross-sectional defect member has crack-inducing joints 72 and 72. You can embed it anywhere. For example, it can be considered that the concrete is buried near the center of the cross section where the tensile stress is maximized when the concrete is internally restrained.

  Moreover, in this embodiment, although the grid | lattice-like reinforcement sheet 43 was employ | adopted as a reinforcing material, it may replace with this and may be mesh shape. Furthermore, instead of the sheet-like reinforcing material, a plate-like reinforcing material can be adopted.

  In this case, for example, as shown in FIG. 8, it is conceivable to form a plate-like reinforcing member 81 in a three-layer structure in which a pair of plate-like main bodies 82 and 82 are tightly attached from both sides. The reinforcing material 81 can be formed of, for example, a hard plastic material. Since the plate-like main body 82 can be configured in the same manner as the plate-like main body 42, the description thereof is omitted here.

  In the present embodiment, the reinforcing sheet 43 is formed of glass fiber. Alternatively, the reinforcing sheet 43 may be formed of other alkali-resistant fibers such as vinylon, nylon, and polypropylene. As long as the decrease can be prevented, another material may be appropriately employed instead of the alkali-resistant material.

  In this embodiment, the peripheral edge of the reinforcing sheet 43 is projected from the edge of the plate-like main body 42 as the exposed edges 44a and 44b in the in-plane direction of the plate-like main body. For example, only the longitudinal side edge portions 44a and 44a may be protruded, or the reinforcing sheet 43 may be used if it is fixed to the dam plate 63 and the reinforcing bars 64 and 65 using an appropriate jig in the first place. It is not necessary to project a part of the plate from the edge of the plate-like body 42 as an exposed edge.

1,21,31,74 Water-stop structure of induced cracks 2,73 Wall (concrete frame)
3,72 Crack-inducing joint 4,22 Waterstop 5 Virtual line 6,7,24,25 Cross-sectional defect member 41 Water-stopping member for induced crack 42 Plate-like body 43 Reinforcement sheet (reinforcement material)
44a, 44b Exposed edge 62 Joint material 61, 61 Joint piece 63 Dam plate

Claims (16)

In the still water structure of the induced crack which is a concrete frame and is embedded in or near the imaginary line passing through the crack-inducing joint formed substantially perpendicular to the surface of the concrete body,
A water-stop structure for induced cracks, wherein the water-stopper is configured to contain an insoluble substance-generating material that generates an insoluble substance by reacting with water. 2. The induced cracking-preventing material according to claim 1, wherein the insoluble substance generating material is composed of cement, a latent hydraulic inorganic material having expandability, and a crystal growth material that generates crystals in an environment where water and cement exist. Water structure. The water-stopping structure for induced cracks according to claim 1, wherein the insoluble substance-generating material is composed of a concrete expansion material and a crystal growth material that generates crystals in an environment where water and the concrete expansion material are present. The water-stopping structure for induced cracks according to claim 1, wherein the insoluble substance-generating material is composed of cement and a crystal growth material that generates crystals in an environment where water and cement are present. The said water stop is located in the back side of the said crack induction joint, between this crack induction joint and the cross-section defect member embed | buried along the said virtual line, or between the said cross-section defect members. The water-stop structure of the induced crack as described in any one of 4. In a water-stopping member for induced cracks embedded in or near a virtual line passing through a crack-inducing joint formed on the surface substantially perpendicular to the surface of the concrete frame,
A water-stopping member for induced cracks, characterized in that it is molded so as to contain an insoluble substance-generating material that reacts with water to generate an insoluble substance. The insoluble substance generating material is composed of cement, a latent hydraulic inorganic material having expandability, and a crystal growth material that generates crystals in an environment where water and cement are present. Water member. The water-stopping member for induced cracks according to claim 6, wherein the insoluble substance-generating material is composed of a concrete expansion material and a crystal growth material that generates crystals in an environment where water and the concrete expansion material exist. The water-stopping member for induced cracks according to claim 6, wherein the insoluble substance generating material is composed of cement and a crystal growth material that generates crystals in an environment where water and cement are present. In a water-stopping member for induced cracks embedded in or near a virtual line passing through a crack-inducing joint formed on the surface substantially perpendicular to the surface of the concrete frame,
It comprises a plate-like main body formed into a plate shape containing an insoluble substance generating material that reacts with water to generate an insoluble substance, and a plate-like or sheet-like reinforcing material embedded in the plate-like main body. A water-stopping member for induced cracks. 11. The induced cracking stop material according to claim 10, wherein the insoluble substance generating material is composed of cement, a latent hydraulic inorganic material having expansibility, and a crystal growth material that generates crystals in an environment where water and cement exist. Water member. The water-stopping member for induced cracks according to claim 10, wherein the insoluble substance generating material is composed of a concrete expansion material and a crystal growth material that generates crystals in an environment where water and the concrete expansion material exist. The water-stopping member for induced cracks according to claim 10, wherein the insoluble substance generating material is composed of cement and a crystal growth material that generates crystals in an environment where water and cement are present. The water stop member for induced cracks according to any one of claims 10 to 13, wherein a part of the reinforcing material protrudes from the edge of the plate-like main body as an exposed edge in the in-plane direction. A method for constructing a water-stopping structure for induced cracks using the water-stopping member for induced cracks according to claim 14, wherein a joint material for forming the crack-induced joints is arranged in abutment in parallel. It is composed of joint pieces, and the exposed edge portion of the reinforcing member is wound around one of the pair of joint pieces, and the edge portion of the plate-like main body is sandwiched between them. The concrete frame is fixed to the back surface of the barrier plate, and then the concrete is placed inside the barrier plate, and after the concrete is hardened, the pair of joint pieces are removed. Construction method of induced cracking water-stop structure. The construction method of the induced crack water stop structure of Claim 15 which cuts out the part which protrudes from the said crack induction joint in the said plate-shaped main body after hardening of the said concrete.

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