JP5002085B2 - Induction embedding material and crack induction structure using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively concentrate shrink crack occurrence positions and improve the positioning accuracy of a guiding buried member relative to a guiding joint even in a reinforced concrete wall having a large wall thickness and a reinforced concrete wall for which a strength or an earthquake resistance is requested. <P>SOLUTION: This guiding buried member 41 comprise a long plate-like buried member body 42, a pair of stiffening parts 43, 43 extending on both sides of the buried member body, and a pair of plate-like guiding parts 44, 44 extending on the outer sides of the stiffening parts, respectively. The stiffening part 43 has a bent cross section along the lateral direction of the buried member body 42, and a same cross section in the longitudinal direction. The plate-like guiding parts 44, 44 are parallel to the formed surface of the buried member body 42. A plurality of shearing resistance parts are so formed in the buried member body 42 in a row along the longitudinal direction of the buried member body 42 that the shearing resistance parts are formed in recessed parts 46 on the front surface side and in projecting parts 47 on the rear surface side. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an induction embedding material applied to a concrete wall, particularly a reinforced concrete wall, and a crack induction structure using the same.

  In reinforced concrete structures, temperature shrinkage occurs due to temperature rise due to heat of hydration and subsequent temperature drop, and initial cracks are caused by this, but the shrinkage cracks are not able to bear tensile force. Moreover, it is difficult to completely prevent the occurrence.

  Shrinkage cracks are not structurally problematic per se, but water leaks from the cracks and, if viewed over time, the infiltration of carbon dioxide in the air through the cracks causes neutralization of the concrete and rebar corrosion. There are concerns to cause.

  Therefore, it is desirable to take measures to limit the occurrence of shrinkage cracks in a planned manner so that crack management after concrete placement can be performed reliably and efficiently.

  As a countermeasure against this, a method of forming longitudinal grooves called induction joints on both sides of a reinforced concrete wall, for example, every 3 m is widely known. According to this method, the cross-sectional area of the place where the induction joint is formed becomes relatively smaller than other places, so if the temperature shrinkage occurs after placing concrete, the tensile stress at the place where the induction joint is formed Thus, it becomes easier to concentrate the shrinkage cracks at the induced joint positions.

  In this way, the induction joint is intended to reduce the cross-sectional area of the reinforced concrete wall and thereby aim at a relative increase in tensile stress and, in turn, concentration of cracks, but it induces shrinkage cracks as intended. In order to concentrate at the joint position, it is desirable that the groove depth is 1/5 or more, preferably 25% or more of the actual wall thickness at the time of construction (see Non-Patent Document 1).

  On the other hand, when the wall thickness is large, it may be difficult to concentrate shrinkage cracks due only to the induced joints due to the size of the joint materials on the market, etc., and it is made of a foreign material other than concrete such as iron or vinyl chloride resin. Measures are also being made to use these parts together with the trigger joints.

Japanese Patent No. 2791946 JP 2005-220611 A Utility Model Registration No. 2514088 JP 2007-85169 A "Shrinkage crack control design / construction guideline (draft) / commentary explanation of reinforced concrete buildings", edited by Architectural Institute of Japan, February 10, 2006

  The above-mentioned members are embedded in the same vertical plane as the pair of induction joints provided on both side surfaces of the reinforced concrete wall, and can further induce shrinkage cracks concentrated on the induction joints to the embedded locations. In that sense, it can be called an induction embedding material.

  Here, depending on the fluidity of fresh concrete and the horizontal placement interval, it is inherently difficult to launch concrete while maintaining the same height over a certain length. It is unavoidable that variations occur.

  As a result, the lateral pressure of the fresh concrete acting on the induction embedding material is biased in either direction without balancing between the left and right, resulting in a situation in which the induction embedding material moves or deforms, and consequently positioning accuracy with respect to the induced joint The problem that could not be secured.

  In addition, in order to avoid such problems, it is indispensable to fix the induction embedding material firmly to the reinforcing bar, which is not only very complicated, but also the work of bar arrangement and the construction of the formwork. There was also a problem that the efficiency of reinforced concrete work decreased due to the crossing with the other.

  Also, even if the induction embedment is fixed to the reinforcing bar with a binding wire, for example, the problem that the binding wire loosens due to vibration or hammering when placing concrete, the method of fixing the induction embedment to the reinforcing bar itself, Since a bar arrangement error is included, there is a problem that high positioning accuracy cannot be expected inherently.

  In addition, it is not always clear what kind of influence the induction embedding material has on the strength and seismic resistance of the reinforced concrete wall. In Non-Patent Document 1, it is essential to confirm the structural performance in advance by a supporting experiment. "(Page 219)".

  Therefore, inductive embedding materials cannot be used immediately on structural walls such as load-bearing walls and earthquake-resistant walls, and as a result, shrinkage cracks are effective for reinforced concrete walls where the wall thickness is large or proof or earthquake resistance is required. The problem was that there was no way to prevent it.

  The present invention has been made in consideration of the above-described circumstances, and effectively concentrates the position where shrinkage cracks are generated even in a reinforced concrete wall having a large wall thickness or a reinforced concrete wall that requires strength or earthquake resistance. It is an object of the present invention to provide an induction embedding material that can be used.

  It is another object of the present invention to provide a crack guiding structure capable of improving the relative positioning accuracy of the guiding embedding material with respect to the guiding joint.

  In order to achieve the above-mentioned object, the induction embedding material according to the present invention is in the vicinity of the induction joint provided on the side surface of the concrete wall and includes a wall section including the installation line of the induction joint as described in claim 1. Inductive embedding material embedded in

  An embedding material body having a long plate shape, and both sides of the embedding material body so as to have a cross-sectional shape that is bent or curved along the short direction of the embedding material body and has the same cross-sectional shape in the longitudinal direction. A pair of stiffening portions and a pair of plate-like guiding portions respectively extending outside the stiffening portions so as to be parallel to the formation surface of the embedding material body. .

  Further, the induction embedding material according to the present invention includes a plurality of shear resistance portions arranged in a row along the longitudinal direction of the embedding material body such that the embedding material body has a concave portion on the front side and a convex portion on the back side. And forming a two-way shear key along the longitudinal direction and the short direction of the embedding material body between the concrete in the concave portion and the concrete around the convex portion on the back side in the embedded state. The shear resistance portion is configured.

  Further, the induction embedding material according to the present invention is an induction embedding material that is embedded in the vicinity of the induction joint provided on the side surface of the concrete wall and includes a wall section including the installation line of the induction joint.

  An embedding material body formed in a long plate shape, and a pair of plate-shaped guide portions respectively extending outside the embedding material body so as to be parallel to a forming surface of the embedding material body. A plurality of shear resistance portions are formed in a row along the longitudinal direction of the embedding material main body so as to be concave on the front side of the material main body and convex on the back side, and in the embedded state, the concrete in the concave portion The shear resistance portion is configured such that a two-way shear key is formed along the longitudinal direction and the short side direction of the embedded material body with the concrete around the convex portion on the back side.

  Further, the induction embedding material according to the present invention is configured such that the shear resistance portion has a rectangular flat bottom shape, and the short direction is aligned with one of the short direction and the long direction of the embedding material body, and the longitudinal direction thereof Are aligned in the other direction of the embedment body.

  In addition, the induction embedding material according to the present invention is configured such that the plurality of shear resistance portions are formed to have the same arrangement interval and shape, and the convex portions are fitted into the concave portions when stacked. Is.

  In addition, a crack guiding structure according to the present invention includes a guide embedding material according to any one of claims 1 to 5, a mounting rod having one end attached to a separator that holds a gap between molds, and the mounting A connecting means capable of connecting the other end or intermediate position of the mounting rod to the guide embedding material, and the connecting position of the mounting rod relative to the guide embedding material is adjustable along the material axis direction of the mounting rod. The connection means is configured so that an insertion hole through which the connection means or the mounting rod is inserted is formed in the embedded body of the guide embedded material.

  Moreover, the crack induction structure which concerns on this invention is located in the right and left of the said induction embedding material among the induction embedding materials as described in any one of Claims 1 thru | or 5, and the separator holding the space | interval of formwork. A first mounting rod and a second mounting rod, each having one end attached to the separator, and the first mounting rod and the second mounting rod are interconnected at their other ends. And a connecting means for connecting the guide embedding material at the connecting location, and the connecting position of the first mounting rod or the second mounting rod with respect to the guide embedding material is the first mounting rod. The connecting means is configured to be adjustable along the material axis direction of the rod or the second mounting rod, and the first mounting rod is mounted on the embedded material body of the guide embedded material. The second mounting rod or the connecting means is obtained by forming a through hole to be inserted.

  Further, in the crack guiding structure according to the present invention, the connecting means includes a first female screw into which the other end of the first mounting rod is screwed, and the other end of the second mounting rod. A connecting female screw member in which a second female screw to be screwed is formed at the other end and a narrowing portion that comes into contact with the guide embedding material is formed on an end surface of the second female screw; A positioning nut that is screwed into the other end of the mounting rod and that tightly attaches the induction embedding material to the narrowing portion.

  Further, the crack guiding structure according to the present invention has a pair of opposed flat plate portions and is formed so that the separator is passed between the pair of flat plate portions, and an insertion hole is formed in each of the flat plate portions. A mounting member having a U-shaped cross section is provided, and the mounting rod, the first mounting rod, or the second mounting rod is configured to be inserted through the insertion hole.

  Further, the crack guiding structure according to the present invention includes a connecting means for connecting the induction embedding materials to each other in a state where the induction embedding materials are embedded in parallel, and the connecting means is formed by bending both ends at right angles in the same direction. In addition to the rod-shaped connecting member having two bent portions, insertion holes into which the bent portions are fitted are formed in the induction embedding material.

  The induction embedding material according to the first invention has the same cross-sectional shape in the longitudinal direction so as to have a folded or curved cross section along the short direction of the embedding material body having a long plate shape. As described above, a pair of stiffening portions are extended on both sides of the embedment body.

  In this way, the stiffening part resists bending moment and forced rotation deformation in the out-of-plane direction with the short axis as the central axis, with a predetermined bending rigidity, and suppresses bending and bending deformation of the entire induction embedding material. To do.

  Therefore, even if a concrete side pressure of a different size is applied to the induction embedment placed in the cross section of the concrete wall from the left and right, the induction embedment does not cause bending or rotational deformation with the short direction as the central axis. The initial installation position is maintained, and there is no possibility that the position of the plate-shaped guide portion with respect to the induction joint is shifted.

  Therefore, the shrinkage crack generated at the induction joint can be reliably guided to the induction embedding material. As a result, the shrinkage crack is surely concentrated on the cross section including the installation line of the induction joint and the embedding position of the induction embedding material. It becomes possible.

  The cross-sectional shape of the stiffening portion is arbitrary, and may be appropriately selected so as to ensure a desired bending rigidity. For example, the shape can be arbitrarily selected from a semicircular shape, a trapezoidal shape, a shape in which a semicircle is reversed and continuous, a shape in which a trapezoid is reversed and continuous, and the like.

  In addition to the above-described configuration, the induction embedding material according to the second invention includes a plurality of shear resistance portions along the longitudinal direction of the embedding material body so that the embedding material body has a concave portion on the front side and a convex portion on the back side. In the embedded state, the shear resistance portion is arranged between the concrete in the concave portion and the concrete around the convex portion on the back side along the longitudinal direction and the short side direction of the embedding material body. A two-way shear key is formed.

  Therefore, the concrete that has entered the concave portion of the shear resistance portion becomes a projecting shape, the concrete that expands to the convex portion on the back side becomes a concave shape, and both concrete mesh with each other, and by appropriately selecting the shape of the shear resistance portion, It becomes possible to form a two-way shear key along the longitudinal direction and the short direction of the embedment body.

  According to this configuration, when the concrete wall is subjected to in-plane shearing force, mutual transmission of in-plane shearing force is performed by a shear key (engagement between concrete resisting in-plane shearing deformation) along the longitudinal direction of the embedded body. When the concrete wall is subjected to an out-of-plane shear force, mutual transmission of the out-of-plane shear force is performed by a shear key (engagement between concrete resisting out-of-plane shear deformation) along the short direction of the embedded material body. Thus, the planned concentration of shrinkage cracks can be enhanced without impairing the structural characteristics of the concrete wall, such as strength and earthquake resistance.

  Similarly, in the induction embedding material according to the third invention, a plurality of shear resistance portions are formed in a row along the longitudinal direction of the embedding material body so that the embedding material body has a concave portion on the front side and a convex portion on the back side. In addition, the shear resistance portion is provided with a two-way shear key along the longitudinal direction and the short side direction of the embedding material body between the concrete in the concave portion and the concrete around the convex portion on the back side in the embedded state. It is configured to be formed.

  Therefore, the concrete that has entered the concave portion of the shear resistance portion becomes a projecting shape, the concrete that expands to the convex portion on the back side becomes a concave shape, and both concrete mesh with each other, and by appropriately selecting the shape of the shear resistance portion, It becomes possible to form a two-way shear key along the longitudinal direction and the short direction of the embedment body.

  According to this configuration, when the concrete wall is subjected to in-plane shearing force, mutual transmission of in-plane shearing force is performed by a shear key (engagement between concrete resisting in-plane shearing deformation) along the longitudinal direction of the embedded body. When the concrete wall is subjected to an out-of-plane shear force, mutual transmission of the out-of-plane shear force is performed by a shear key (engagement between concrete resisting out-of-plane shear deformation) along the short direction of the embedded material body. Thus, the planned concentration of shrinkage cracks can be enhanced without impairing the structural characteristics of the concrete wall, such as strength and earthquake resistance.

  In the second and third inventions, the shear resistance portion has a concave portion on the front side of the embedded material body and a convex portion on the back side, and in the embedded state, the concrete in the concave portion and the concrete around the convex portion on the rear side. As long as it is configured to form a two-way shear key along the longitudinal direction and the short direction of the embedment body between the shape and structure is arbitrary, for example, when formed by press work, By using a polygonal or circular male mold such as a square, a rectangle, or a rhombus, the planar shape of the shear resistance portion can be made to correspond to each shape.

  Specifically, the shear resistance portion is formed in a rectangular flat bottom shape, and the short direction is aligned with one of the short direction and the long direction of the embedding material body, and the long direction is the other direction of the embedding material body. It is possible to arrange them in the same manner.

  As described above, a plurality of shear resistance portions are arranged in a row along the longitudinal direction of the embedment material body. However, the shear resistance portions are formed so as to have the same arrangement interval and shape, and protruded when stacked. If the part is configured to fit into the recess, the induction embedding material according to the present invention can be extended upward by overlapping the ends, and can be easily applied to concrete walls of various heights. Become.

  In addition, it is possible to prevent the shift in the translational direction and the shift in the normal direction between the guide embedding materials at the stacked locations, enabling highly accurate and efficient erection, and after concrete placement This also contributes to ensuring the accuracy of the burial position.

  The induction joint used in combination with the induction embedding material according to each of the first to third inventions described above can be appropriately selected from known ones, and the groove shape such as trapezoid, V-cut, and notch is arbitrary. . In addition, concrete walls mainly include reinforced concrete walls, but they can be applied to all concrete walls that need to prevent harmful shrinkage cracks, such as prestressed concrete structures and fiber reinforced concrete structures. Of course, it is also included in the present invention.

  The induction joint is roughly divided into a case where both sides of the concrete wall are provided at positions facing each other and a case where the induction joint is provided only on one side surface of the concrete wall, but includes the above-described installation line for the induction joint. In principle, the wall cross section refers to the wall cross section orthogonal to the side of the concrete wall provided with the induction joint. When the induction joint is provided on both sides of the concrete, the above-mentioned orthogonal wall cross section or each induction joint is described above. It shall mean the wall cross section connecting

  The induction embedding material according to the first to third inventions can be fixed in a concrete section by a known method at the time of construction, and can be fixed to a reinforcing bar using, for example, a binding wire.

  However, if the binding wire is loosened due to vibration or striking during concrete placement and the mounting position of the induction embedding material according to the present invention is shifted, it becomes difficult to obtain the above-described effects. In addition, since the attachment method itself of fixing to a reinforcing bar using a tie wire or the like includes a reinforcing bar arrangement error, high accuracy cannot be expected inherently.

  Therefore, as a result of conducting research and development focusing on how to improve the relative positioning accuracy of the induction embedding material relative to the induction joint, the present applicant has obtained the following new knowledge. .

  That is, the crack induction structure according to the fourth invention is the induction embedding material according to any one of claims 1 to 5, and a mounting rod having one end attached to a separator that holds a gap between the molds, A connecting means for connecting the other end or the intermediate position of the mounting rod to the guide embedding material, and the connecting position of the mounting rod relative to the guide embedding material is adjusted along the material axis direction of the mounting rod The connecting means is configured to be flexible, and an insertion hole through which the connecting means or the mounting rod is inserted is formed in the embedded body of the guide embedded material.

  Further, the crack guiding structure according to the fifth invention is located on the left and right of the guiding embedding material among the guiding embedding material according to any one of claims 1 to 5 and a separator that holds a gap between the molds. A first mounting rod and a second mounting rod each having one end attached to the separator, and the first mounting rod and the second mounting rod connected to each other at their other ends. And connecting means for connecting the guide mounting material at the connecting portion, and the connecting position of the first mounting rod or the second mounting rod to the guide mounting material is the first mounting rod or the second mounting rod. The connecting means is configured to be adjustable along the material axis direction of the mounting rod of the first mounting rod, and the first mounting rod, the second mounting rod, or the connecting means is provided on the embedded body of the guide embedded material. By forming a through hole to be threaded.

  In the fourth and fifth inventions, since the induction embedding material according to the first to third inventions is attached to the separator via the attachment rod, positioning is performed with reference to the formwork as in the induction joint. Thus, the relative mounting accuracy of the induction embedding material with respect to the induction joint is greatly improved.

  As a result, the straight groove that is the induction joint and the plate-like guide portion of the guide embedding material can be accurately opposed to each other, and thus, between the back side of the straight groove and the plate-like guide portion of the guide embedding material. It is possible to accurately form the crack induction surface and to concentrate the shrinkage crack on the crack induction surface.

  In particular, when the induction joint is a type in which a notch-shaped groove is formed, the concentration effect of shrinkage cracks can be further enhanced in combination with the effect of the notch induction joint.

  The connecting means according to the fourth invention is capable of connecting the mounting rod to the guide embedding material, but it is optional whether the connecting point is the other end or the intermediate position, and the connecting rod is connected to the other end. In this case, the induction embedding material is fixed only by a separator positioned on one side thereof. On the other hand, when connecting to the intermediate position and attaching the other end of the mounting rod to another separator located on the opposite side of the guide embed material, the guide embed material is fixed by the separators located on both sides thereof. The Rukoto.

  This connecting means can be composed of, for example, two nuts, and when mounting, the first nut, the induction embedding material according to the first to third inventions, and the second nut are sequentially mounted. It is only necessary to screw or insert the rod into the rod, and then to narrow the guide implant with two nuts in a state where the guide implant is aligned with the induction joint.

  The connecting means according to the fifth invention is, for example, a second female screw in which a first female screw into which the other end of the first mounting rod is screwed is formed at one end and the other end of the second mounting rod is screwed into. Is formed on the other end of the connecting female screw member formed on the end face of the second female screw and the other end of the second mounting rod. It can be constituted by a positioning nut for tightly attaching the induction embedding material according to the first to third inventions between the above-mentioned narrowing portions.

  In attaching one end of the mounting rod to the separator, any of the known means can be adopted. Alternatively, the separator has a pair of opposed flat plate portions, and the separator is interposed between the pair of flat plate portions. A mounting member having a U-shaped cross section formed so as to pass through and having an insertion hole formed in each of the flat plate portions, and the mounting rod, the first mounting rod, or the second mounting. The rod for use can be configured to be freely inserted into the insertion hole.

  According to such a configuration, it is possible to reliably and easily perform mounting of the mounting rod nut to the separator and consequently positioning of the induction embedding material, and the situation where the mounting rod is detached from the separator during concrete placing. Can be prevented in advance.

  When the wall section is large, the guide embedding material may be embedded in parallel along the wall section in the vicinity of the induction joint provided on the side surface of the concrete wall and including the installation line of the induction joint.

  In this case, it is provided with a connecting means for mutually connecting the induction embedding materials in a state where the induction embedding materials are embedded in parallel, and the connecting means is a rod-like shape having two bent portions formed by bending both ends at right angles in the same direction. If it is composed of a connecting member and the insertion holes into which the bent portions are fitted are formed in the induction embedding material, the two induction embedding materials are integrated to increase the degree of fixation and rigidity, and against the concrete side pressure. It is possible to further increase the strength and, consequently, the positioning accuracy of the induction embedding material.

  In addition, how to fix the bent portion fitted in the insertion hole formed in the induction embedding material is arbitrary, and in addition to the case of only insertion (insertion), it was cut at the tip of the bent portion. It may be fixed with a nut using a male screw.

  Here, holes are drilled at a predetermined pitch in the induction embedding material, and among these holes, the hole positioned at the height of the separator is used as an insertion hole for inserting the mounting rod, and the other holes are used as rods. It can also be used as an insertion hole for attaching the connecting member.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an induction embedding material according to the present invention and a crack induction structure using the same will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

(First embodiment)

  FIG. 1 is a perspective view showing the induction embedding material according to the first embodiment, and FIG. 2 is a front view and a sectional view of the same. As can be seen from these drawings, the induction embedding material 1 according to this embodiment includes a long plate-shaped embedding material body 2 and a pair of stiffening portions 3 and 3 extending on both sides of the embedding material body. , And a pair of plate-like guide portions 4 and 4 respectively extending outside the stiffening portions.

  The stiffening portion 3 is formed to have a bent cross section along the short direction of the embedment body 2 and to have the same cross sectional shape in the longitudinal direction. Is formed so as to be parallel to the formation surface of the embedding material body 2.

  The induction embedding material 1 can be formed by pressing a galvanized steel sheet having a width of 75 mm, a length of 2,000 mm, and a thickness of 1.2 mm, for example.

  FIG. 3 is a horizontal cross-sectional view showing a usage state of the induction embedding material 1. As can be seen from the figure, when using the guide embedding material 1, the guide embedding material 1 is built and positioned in the concrete placement space 30 sandwiched between the molds 31 and 31, and then, a known fixing method, for example, After fixing the guide embedding material 1 by a fixing method using a binding wire, concrete is placed in the concrete placement space 30. In positioning the guide embedding material 1, the plate-like guide portions 4 and 4 are reinforced concrete walls. 35, by positioning the induction embedding material 1 so as to face the back sides of the pair of induction joints 33, 33 provided on both sides of the 35, the induction embedding material is positioned between the induction joints 33, 33, It installs in the wall section 34 containing the installation line of each induction joint.

  As described above, according to the induction embedding material 1 according to the present embodiment, the longitudinal direction of the embedding material main body 2 having a long plate shape has a folded cross section along the short direction. Since the pair of stiffening portions 3 and 3 are extended on both sides of the embedding material body 2 so as to have the same cross-sectional shape, the stiffening portions 3 and 3 are bent in the out-of-plane direction with the short direction as the central axis. It resists the moment and forced rotation deformation with a predetermined bending rigidity, and suppresses bending and bending deformation of the entire induction embedding material 1.

  Therefore, even when fresh concrete is placed in the concrete placement space 30, even if concrete side pressures of different sizes are applied to the induction embedding material 1 from the left and right, the induction embedding material 1 is bent with the lateral direction as the central axis. In addition, the initial installation position is maintained without causing any rotational deformation, and there is no possibility that the positions of the plate-like guide portions 4 and 4 with respect to the induction joints 33 and 33 are shifted.

  Therefore, the shrinkage cracks generated at the induction joints 33 and 33 can be reliably guided to the induction embedding material 1, and as a result, the shrinkage cracks are caused by the installation line of the induction joints 33 and 33 and the installation position of the induction embedding material 1. Can be reliably concentrated on the wall section 34 including

  In the present embodiment, the case where the pair of induction joints 33 and 33 are provided on both side surfaces of the reinforced concrete wall 35 has been described, but instead, when the induction joint 33 is installed only on one side surface of the reinforced concrete wall 35. You may apply.

  In such a configuration, one of the plate-like guide portions 4, 4 is installed on the wall section 34 so as to face the back side of the induction joint 33 provided on one side surface of the reinforced concrete wall 35. do it. The wall section 34 is also a wall section orthogonal to the side surface of the reinforced concrete wall 35.

  According to such a configuration, the degree of concentration of shrinkage cracks on the wall cross section 34 is not so excellent as in the case where the pair of induction joints 33 and 33 are provided, but is substantially the same as the above-described embodiment except for this point. Has the effect of.

(Second Embodiment)

  FIG. 4 is a perspective view showing the induction embedding material according to the second embodiment, and FIG. 5 is a front view and a sectional view of the same. As can be seen from these drawings, the guide embedding material 41 according to the present embodiment includes a long plate-like embedding material body 42 and a pair of stiffening portions 43 and 43 extending on both sides of the embedding material body. , And a pair of plate-like guide portions 44 and 44 respectively extending outside the stiffening portions.

  The stiffening portion 43 is formed to have a bent cross section along the short direction of the embedment main body 42 and to have the same cross sectional shape in the longitudinal direction. Is formed so as to be parallel to the formation surface of the embedding material main body 42.

  The embedding material body 42 includes a plurality of shear resistance portions 45 arranged in a row along the longitudinal direction of the embedding material body 42 so that the embedding material body 42 has a concave portion 46 on the front side and a convex portion 47 on the back side. It is formed.

  The shear resistance portion 45 is formed between the concrete in the concave portion 46 and the concrete around the convex portion 47 on the back side in the state in which the induction embedding material 41 is embedded in the concrete. A rectangular flat bottom is formed so as to form a two-way shear key along the direction, and its short direction (in this embodiment, since it is square, the short direction is the horizontal direction in FIG. 5A). Are aligned in the transverse direction of the embedment material body, and the longitudinal direction thereof is aligned with the longitudinal direction of the embedment material body 42.

  The induction embedding material 41 can be formed, for example, by pressing a galvanized steel sheet having a width of 75 mm, a length of 2,000 mm, and a thickness of 1.2 mm.

  FIG. 6 is a horizontal cross-sectional view showing how the induction embedding material 41 is used. As can be seen from the figure, when using the guide embedding material 41, the guide embedding material 41 is built and positioned in the concrete placement space 30 sandwiched between the molds 31, 31, and then, a known fixing method, for example, After the induction embedding material 41 is fixed by a fixing method using a binding wire, concrete is placed in the concrete placement space 30. In positioning the induction embedding material 41, the plate-like induction portions 44, 44 are reinforced concrete walls. 35. By positioning the induction embedding material 41 so as to face the back side of each of the pair of induction joints 33, 33 provided on both side surfaces of the 35, the induction embedding material is placed between the induction joints 33, 33, It installs in the wall section 34 containing the installation line of each induction joint.

  As described above, according to the induction embedding material 41 according to the present embodiment, the embedding material main body 42 having a long plate shape has a folded cross-section along the short side direction, and in the longitudinal direction. Since the pair of stiffening portions 43 and 43 are extended on both sides of the embedment body 42 so as to have the same cross-sectional shape, the stiffening portions 43 and 43 are bent in the out-of-plane direction with the short direction as the central axis. It resists the moment and forced rotation deformation with a predetermined bending rigidity, and suppresses bending and bending deformation of the entire induction embedding material 1.

  Therefore, even when fresh concrete is placed in the concrete placement space 30, even if concrete side pressures of different sizes are applied to the induction embedding material 41 from the left and right, the induction embedding material 41 is bent with the lateral direction as the central axis. In addition, the initial installation position is maintained without causing any rotational deformation, and there is no possibility that the positions of the plate-like guide portions 44 and 44 with respect to the induction joints 33 and 33 are shifted.

  Therefore, the shrinkage cracks generated at the induction joints 33 and 33 can be reliably guided to the induction embedding material 41. As a result, the shrinkage cracks are caused by the installation line of the induction joints 33 and 33 and the installation position of the induction embedding material 41. Can be reliably concentrated on the wall section 34 including

  Further, according to the induction embedding material 41 according to the present embodiment, the plurality of shear resistance portions 45 are arranged in the longitudinal direction of the embedding material main body 42 so that the front surface side of the embedding material main body 42 is the concave portion 46 and the rear surface side is the convex portion 47. A plurality of the shear resistance portions are formed in a row along the vertical direction of the embedding material main body 42 between the concrete in the concave portion 46 and the concrete around the convex portion 47 on the back side in the embedded state. A two-way shear key along the direction is formed.

  Therefore, the concrete that has entered the concave portion 46 of the shear resistance portion 45 becomes a projecting shape, and the concrete that spreads around the convex portion 47 on the back side becomes a concave shape, and both concrete mesh with each other via the induction embedding material 41. It becomes possible to form a two-way shear key along the longitudinal direction and the short direction of the embedment body.

  That is, when the reinforced concrete wall 35 receives an in-plane shearing force, as shown in the vertical cross-sectional view of FIG. 7A, a shear key (concrete resisting in-plane shear deformation) along the longitudinal direction of the embedment body 42 is shown. Mutual transmission of in-plane shear force is performed by meshing.

  Further, when the reinforced concrete wall 35 receives an out-of-plane shearing force, as shown in the horizontal sectional view of FIG. 7B, a shear key (resists out-of-plane shear deformation) along the short direction of the embedment main body 42. Mutual transmission of out-of-plane shear force is performed by the engagement of concrete.

  Therefore, it is possible to enhance the planned concentration of shrinkage cracks without impairing the structural characteristics of the reinforced concrete wall such as proof stress and earthquake resistance.

  For in-plane shearing, a certain amount of shear resistance can be expected due to adhesion between the embedded material main body 42 and the concrete without providing the shearing resistance portion 45 as in the first embodiment. May not be sufficient, and in such a case, the formation of the shear key by the shear resistance portion 45 can greatly improve the earthquake resistance. In addition, for the out-of-plane shear, the stiffening portion 43 also contributes to the formation of the shear key, as can be seen in FIG. 7B.

  Although not particularly mentioned in the present embodiment, as shown in FIG. 8, the shearing resistance portions 45 are formed to have the same arrangement interval and shape, and the convex portions 47 fit into the concave portions 46 when stacked. If it comprises so that it may be inserted, it will become possible to extend the guidance embedding material 41 upwards, overlapping edge parts, and to apply it to the reinforced concrete wall of various height.

  Further, in the present embodiment, the side on which the stiffening portion 43 protrudes with respect to the embedment material body 42 has been described as the back side and the side that does not protrude is referred to as the front side for the sake of convenience. This is optional, and instead of the above-described embodiment, the side from which the stiffening portion 43 protrudes may be considered as the front surface, and the side that does not protrude may be considered as the back surface. In this case, the unevenness of the shearing resistance portion is opposite to the unevenness of the shearing resistance portion 45, but the shearing resistance portion is a concave portion on the front side of the embedded material body and a convex portion on the back side.

  In the present embodiment, the plurality of shear resistance portions 45 are formed in a row so that their member axes coincide with the longitudinal axis of the embedding material main body 42. However, the shear resistance portions in the present invention are formed of the embedding material. It suffices to form the whole body in a row along the longitudinal direction of the main body, and the longitudinal axis and the member axis of the shearing resistance portion 45 do not necessarily coincide with each other as in the present embodiment.

  For example, if it is possible to arrange in a zigzag manner on the left and right sides of the longitudinal axis of the embedment material body and there is no need for stacking, a plurality of shear resistance parts having different shapes and sizes are arranged along the longitudinal direction. It may be arranged in a shape.

  Also in this embodiment, similarly to the first embodiment, the guide embedding material 41 may be applied when the induction joint 33 is installed only on one side surface of the reinforced concrete wall 35.

(Third embodiment)

  FIG. 9 is a perspective view showing the induction embedding material according to the third embodiment, and FIG. 10 is a front view and a sectional view of the same. As can be seen from these drawings, the guide embedding material 91 according to the present embodiment includes a long plate-like embedding material main body 92 and a pair of plate-like guide portions 94 extending on both sides of the embedding material main body. 94, and the plate-like guide portions 94, 94 are formed as flat plates that are parallel to the forming surface of the embedding material main body 92, that is, integrated with each other.

  The embedding material main body 92 includes a plurality of shear resistance portions 45 arranged in a row along the longitudinal direction of the embedding material main body 92 so that the front side of the embedding material main body becomes a concave portion 46 and the rear surface side becomes a convex portion 47. It is formed.

  The shear resistance portion 45 is formed between the concrete in the concave portion 46 and the concrete around the convex portion 47 on the back side in the state in which the induction embedding material 91 is embedded in the concrete. A rectangular flat bottom is formed so as to form a two-way shear key along the direction, and its short direction (in this embodiment, since it is square, the short direction is the horizontal direction in FIG. 10A). Are aligned in the transverse direction of the embedment material body, and the longitudinal direction thereof is aligned with the longitudinal direction of the embedment material body 92.

  The induction embedding material 91 can be formed, for example, by pressing a galvanized steel sheet having a width of 75 mm, a length of 2,000 mm, and a thickness of 1.2 mm.

  FIG. 11 is a horizontal cross-sectional view showing a usage situation of the induction embedding material 91. As can be seen from the figure, when using the guide embedding material 91, the guide embedding material 91 is built and positioned in the concrete placement space 30 sandwiched between the molds 31 and 31, and then, a known fixing method, for example, After fixing the guide embedding material 91 by a fixing method using a binding wire, concrete is placed in the concrete placement space 30. In positioning the guide embedding material 91, the plate-like guide portions 94 and 94 are reinforced concrete walls. 35, by positioning the induction embedding material 91 so as to face the back side of each of the pair of induction joints 33, 33 provided on both side surfaces of the 35, the induction embedding material is placed between the induction joints 33, 33, It installs in the wall section 34 containing the installation line of each induction joint.

  As described above, according to the induction embedding material 91 according to the present embodiment, the embedding material main body is provided with the plurality of shear resistance portions 45 such that the embedding material main body 92 has the concave portion 46 on the front side and the convex portion 47 on the back side. A plurality of the shear resistance portions are formed in a row along the longitudinal direction of 92, and the shear resistance portion is formed between the concrete in the recessed portion 46 and the concrete around the protruding portion 47 on the back side in the embedded state. A two-way shear key is formed along the direction and the short direction.

  Therefore, the concrete that has entered the concave portion 46 of the shear resistance portion 45 has a projecting shape, and the concrete that spreads around the convex portion 47 on the back side thereof has a concave shape, and both concrete mesh with each other via the induction embedding material 91. The bi-directional shear key along the longitudinal direction and the short direction of the embedment body 92 can be formed. Such a two-way shear key makes it possible to increase the planned concentration of shrinkage cracks without impairing the structural characteristics of the reinforced concrete wall such as proof stress and earthquake resistance.

  Note that the two-way shear key according to the present embodiment is the same as that described with reference to FIG. 7, and therefore detailed description thereof is omitted here.

  Further, the modification example of the stacking shown in FIG. 8 is also applicable to the present embodiment, and is formed so that the arrangement interval and shape of the shearing resistance portions 45 are the same, and the convex portion when stacked. If the 47 is configured to fit into the recess 46, the guide embedding material 91 can be extended upward with the ends overlapped, and can be applied to reinforced concrete walls of various heights. It becomes.

  Also in this embodiment, as in the first embodiment, the induction embedding material 91 may be applied when the induction joint 33 is installed only on one side surface of the reinforced concrete wall 35.

(Fourth embodiment)

  Next, a fourth embodiment will be described. In addition, about the same components etc., the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 12 is a perspective view showing an induction embedding material used in the crack induction structure according to this embodiment, and FIG. 13 is a front view and a cross-sectional view thereof. As can be seen from these drawings, the guide embedding material 131 used in the present embodiment includes a long plate-like embedding material body 2 and a pair of stiffening portions 3 and 3 extending on both sides of the embedding material body. , And a pair of plate-like guide portions 4 and 4 respectively extending outside the stiffening portions.

  FIG. 14 is a horizontal sectional view showing a crack guiding structure 141 according to this embodiment. As can be seen from the figure, the crack guiding structure 141 according to the present embodiment includes the above-described induction embedding material 131 and the separator that holds the space between the molds 31 and 31. As an attachment rod 133a as a first attachment rod whose one end is attached to the separator 32a located on the right side, and as a second attachment rod whose one end is attached to the separator 32b located on the left side The connecting rod 133b, the connecting rod 133a and the mounting rod 133b are connected to each other at the other end, and the connecting female screw member 134 as a connecting means for connecting the guide embedding material 131 at the connecting position and positioning And a nut 137.

  The connecting female screw member 134 and the positioning nut 137 can adjust the connecting position of the mounting rods 133a and 133b with respect to the guide embedding material 131 along the material axis direction of the mounting rod.

  As can be clearly seen in FIG. 14 (b), the connecting female screw member 134 is formed with a female screw 135a as a first female screw into which the other end of the mounting rod 133a is screwed. A female screw 135b as a second female screw into which the other end of the mounting rod 133b is screwed is formed at the end, and an end surface of the female screw 135b serves as a constricted portion to be in contact with the guide embedding material 131. A ridge 136 is formed.

  The mounting rod 133b is screwed with a positioning nut 137 at the other end to a desired position, and the tip thereof is inserted into the insertion hole 132 formed in the embedment body 2 of the guide embedment 131, and then the connecting female screw member 134 is inserted. By screwing into the female screw 135b, the guide embedding material 131 can be tightly attached between the positioning nut 137 and the flange 136.

  One end of the mounting rods 133a and 133b can be attached to the separators 32a and 32b with a mounting member 139 and a nut 138, as can be seen in FIG.

  As shown in FIG. 15, the mounting member 139 has a U-shaped cross section, and has a pair of opposed flat plate portions 151 and 152, and separators 32a and 32b are passed between the pair of flat plate portions. The flat plate portions 151 and 152 are formed with insertion holes 153 and 154 through which the mounting rods 133a and 133b are inserted. In addition, a stopper 156 formed by bending the tip of the flat plate portion 151 inward is provided to prevent the mounting rods 133a and 133b from being detached from the separators 32a and 32b due to jumping up due to concrete placement. Play a role.

  In order to construct the crack guiding structure 141 according to the present embodiment, first, the mounting rod 133b is inserted into the insertion hole 132 of the guide embedding material 131 corresponding to the installation height of the separators 32a and 32b, and then each mounting is performed. The connecting rod 133 b is connected to the guide embedding material 131 by the connecting female screw member 134 and the positioning nut 137.

  For example, the separators 32a and 32b are arranged in three stages, that is, the upper stage, the middle stage, and the lower stage, at the planned installation position of the induction embedding material 131, and the induction embedding material 131 is connected using these three sets of separators 32a and 32b. If so, the three mounting rods 133b are connected to the guide embedding material 131.

  These connecting operations do not have to be performed in the molds 31 and 31 and may be grounded.

  In addition, the timing which performs positioning using the positioning nut 137 is arbitrary, and positioning may be performed at this stage or may be performed at the final stage.

  Next, as shown in FIG. 16 (a), the guide embedding material 131 to which the three mounting rods 133 b are connected is suspended in the molds 31 and 31. At this time, even if it is intended to be hung directly to the planned installation position, the separator side end of the mounting rod 133b interferes with the separator 32b, so that it is hung in a state of being released in the horizontal direction (right side in the figure) After hanging down to the height, it can be returned to its original position.

  Next, as shown in FIG. 16 (b), the end portions on the separator side of the three mounting rods 133b are respectively inserted into the insertion holes 153 and 154 of the mounting member 139, and then the nuts 138 are loosely screwed together. In this state, the three attachment rods 133b are dropped into the separator 32b so that the separator 32b fits between the pair of flat plate portions 151 and 152 of the attachment member 139.

  Next, the mounting rod 133a is screwed into the female screw 135a of the connecting female screw member 134, thereby connecting the three mounting rods 133a to the right side of the guide embedding material 131, and attaching the mounting member 139 and the nut 138 to each other. The separator side end is attached to the separator 32a.

  Next, positioning of the guide embedment 131 using the positioning nut 137 is performed again as necessary, and then the nuts 138 and 138 on both sides are tightened to fix the guide embedment 131.

  In positioning the guide embedding material 131, the guide embedding material 131 is placed so that the plate-like guide portions 4 and 4 face the back sides of the pair of induction joints 33 and 33 provided on both side surfaces of the reinforced concrete wall 35, respectively. By positioning, the induction embedding material is installed between the induction joints 33 and 33 and on the wall section 34 including the installation lines of the induction joints (FIG. 14A).

  Finally, concrete is placed in the concrete placement space 30.

  As described above, according to the crack guiding structure 141 according to the present embodiment, the induction embedding material 131 is attached to the separators 32a and 32b via the attachment rods 133a and 133b. Positioning is performed with reference to the frames 31 and 31, and thus the relative mounting accuracy of the guide embedding material 131 with respect to the induction joints 33 and 33 is greatly improved.

  As a result, it becomes possible to make the straight groove serving as the induction joints 33 and 33 and the plate-like guide portions 4 and 4 of the guide embedding material 131 accurately face each other, and thus the back side of the straight groove and the guide embedding material 131. It is possible to accurately form the cross section 34 which is a crack guiding surface between the plate-shaped guiding portions 4 and 4 and to concentrate the shrinkage cracks on the crack guiding surface.

  Further, according to the crack guiding structure 141 according to the present embodiment, the connecting female screw member 134 so that the connecting position of the mounting rods 133a and 133b with respect to the guide embedding material 131 can be adjusted along the material axis direction of the mounting rod. And since the positioning nut 137 is configured, the positioning accuracy of the guide embedding material 131 can be further improved.

  Further, according to the crack guiding structure 141 according to the present embodiment, the separator side end portions of the mounting rods 133a and 133b are attached to the separators 32a and 32b using the mounting member 139 and the nut 138. It is possible to reliably and easily position the mounting rod nuts 133a and 133b to the position 32b, and consequently the positioning of the guide embedding material 131.

  In the present embodiment, one end of the mounting rods 133a and 133b is inserted into the insertion holes 153 and 154 of the mounting member 139 and the nut 138 is screwed in. However, the nut 138 is omitted and the insertion hole 153 is omitted. A female screw may be cut on the inner peripheral surface of 154, and one end of the mounting rods 133a and 133b may be screwed onto the female screw.

  Further, in this embodiment, the guide embedding material 131 is fixed from the separators 32a and 32b disposed on both sides thereof via the mounting rods 133a and 133b. However, the guide embedding material 131 is not necessarily fixed from both sides. The induction embedding material 131 may be fixed with only one separator.

  FIG. 17 (a) is an example in which the guide embedding material 131, which is tightly coupled between the connecting female screw member 134 and the positioning nut 137, is fixed only from the separator 32b via the mounting rod 133b. FIG. 17 (b) shows an example in which the induction embedding material 131 tightly attached between the nuts 171 and 171 is fixed only from the separator 32b via the mounting rod 133b.

  In both modified examples, since the guide embedding material 131 is fixed only from the separator 32b on one side, the stability is not as high as that in the case of fixing with the separators 32a and 32b on both sides. Therefore, there is no change in that the positioning accuracy of the guide embedding material 131 with respect to the induction joints 33 and 33 can be improved as compared with the conventional case. Further, since the position of the rod axial direction can be adjusted by changing the positions of the positioning nut 137 and the nuts 171 and 171, the guide embedding material 131 can be easily positioned. In the modified example in FIG. 5B, the nuts 171 and 171 are connecting means.

  On the other hand, in the case where the guide embedding material 131 is connected and fixed from the two separators 32a and 32b located on both sides thereof as in the above-described embodiment, instead of the two attachment rods 133a and 133b, one attachment You may make it fix to separator 32a, 32b with a rod for use.

  As a specific configuration of such a modified example, one mounting rod is composed of all screw bolts, and nuts 171 and 171 are screwed to an intermediate position thereof, for example, near the center, and the induction embedding material 131 is tightly attached by the nut. In addition, one end of each screw bolt may be attached to the separator 32a and the other end to the separator 32b.

  Further, in the present embodiment, the flange 136 as the narrow portion that contacts the guide embedding material 131 is formed on the end surface of the female screw 135b, but if the end surface of the female screw 135b functions as the narrow portion,鍔 136 can be omitted.

  In the present embodiment, the separators 32a and 32b are first constructed, and then the induction embedding material 13 is installed and fixed to the separator. Instead, the induction embedding material 13 is installed in advance. Then, after temporarily holding the separators 32a and 32b, the guide embedding material 31 may be positioned and fixed to the separators 32a and 32b.

  In the present embodiment, the example in which the induction embedding material 131 is used as the induction embedding material used for the crack induction structure has been described. However, instead of this, the induction embedding material shown in FIGS. 18 and 19 may be used. it can. That is, the induction embedding material 181 shown in the figure is different from the induction embedding material 41 in that the insertion hole 132 is provided, and is extended on both sides of the long plate-like embedding material body 42 and the embedding material body. It consists of a pair of stiffening portions 43, 43 and a pair of plate-like guide portions 44, 44 extending outside the stiffening portions, respectively.

  FIG. 20 is a horizontal sectional view showing a crack guiding structure 201 according to the present embodiment. As can be seen from the figure, the crack guiding structure 201 according to the present embodiment includes the above-described induction embedding material 181 and the separator that holds the gap between the molds 31, 31. The mounting rod 133a with one end attached to the separator 32a located on the right side, the mounting rod 133b with one end attached to the separator 32b located on the left side, the mounting rod 133a and the mounting rod 133b. Are connected to each other at the other end and a connecting female screw member 134 and a positioning nut 137 are connected to the guide embedding material 181 at the connecting portion.

  In the present embodiment, the example in which the induction embedding material 181 is used as the induction embedding material used for the crack guiding structure has been described. However, instead of this, the induction embedding material shown in FIGS. 21 and 22 may be used. it can. That is, the induction embedding material 211 shown in the figure is different from the induction embedding material 91 in that the insertion hole 132 is provided, and is extended on both sides of the long plate-like embedding material main body 92 and the embedding material main body. The embedding material main body 92 is provided with an insertion hole 132.

  FIG. 23 is a horizontal sectional view showing a crack guiding structure 231 according to this embodiment. As can be seen from the figure, the crack guiding structure 231 according to the present embodiment includes the above-described guide embedding material 211 and the separator that holds the gap between the molds 31, 31. Mounting rod 133a with one end attached to the separator 32a located on the right side of the mounting rod, mounting rod 133b with one end attached to the separator 32b located on the left side, the mounting rod 133a and the mounting rod 133b is connected to each other at the other end, and the connecting female screw member 134 and the positioning nut 137 are connected to the guide embedding material 211 at the connecting portion.

  The two modifications shown in FIGS. 18 to 23 also have the same effects as described above. That is, according to the above-described modification, in order to attach the induction embedding material 181 and the induction embedding material 211 to the separators 32a and 32b via the attachment rods 133a and 133b, the same molds 31 and 31 as the induction joints 33 and 33 are used as a reference. Thus, the relative mounting accuracy of the induction embedding material 181 and the induction embedding material 211 with respect to the induction joints 33 and 33 is greatly improved.

  As a result, it is possible to accurately oppose the straight grooves that are the induction joints 33 and 33 and the plate-like guide portions 44 and 44 of the guide embedding material 181 or the plate-like guide portions 94 and 94 of the guide embedding material 211. Thus, the cross section 34 which is a crack induction surface between the back side of the straight groove and the plate-like guide portions 44 and 44 of the guide embedding material 181 or between the plate-like guide portions 94 and 94 of the guide embedding material 211. Can be accurately formed, and shrinkage cracks can be concentrated on the crack guide surface.

  Further, according to the above-described modification, the connecting female screw member 134 and the connecting female screw member 134 and the connecting position of the mounting rods 133a and 133b with respect to the guide embedding material 181 and the guide embedding material 211 can be adjusted along the material axis direction of the mounting rod. Since the positioning nut 137 is configured, the positioning accuracy of the guide embedding material 131 and the guide embedding material 211 can be further improved.

  Further, according to the above modification, the separator side end portions of the mounting rods 133a and 133b are attached to the separators 32a and 32b using the mounting member 139 and the nut 138, so the mounting rods to the separators 32a and 32b are attached. The nuts 133a and 133b can be attached and, as a result, the guide embed material 181 and the guide embed material 211 can be positioned reliably and easily.

  Although not particularly mentioned in the present embodiment, as shown in FIG. 24, the shearing resistance portions 45 are formed to have the same arrangement interval and shape, and the convex portions 47 become the concave portions 46 when stacked. If it is comprised so that it may fit in, it will become possible to extend the guidance embedding material 181 to the upper part by overlapping ends, and it will become possible to apply to the reinforced concrete wall of various heights. Here, the mounting rod 133b is inserted into the insertion holes 132, 132 of the two guided embedding members 181 stacked, and the two guiding embedding members 181 may be fixed together as described above. . That is, in the case where the guide embedment 181 is extended upward, the connecting female screw member 134 and the positioning nut 137 are connected to the induction joint 33 as described above by connecting the two guide embeds 181 and 181 at the overlapping portion. , 33 as well as the function of integrating the two guide embedding materials 181 and 181 at the overlapping portion. The induction burying material 211 can have a similar stacked structure, but detailed description thereof is omitted.

  Moreover, although this embodiment demonstrated the case where a pair of induction joint 33,33 was provided in the both sides | surfaces of the reinforced concrete wall 35, it replaces with this and the induction joint 33 is installed only in one side of the reinforced concrete wall 35. It may be applied to the case. The detailed description is the same as that of the first embodiment, and is omitted here.

(Fifth embodiment)

  Next, a fifth embodiment will be described. In addition, about the same components etc., the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 25 is a perspective view showing a crack guiding structure according to the present embodiment, and FIG. 26 is a horizontal sectional view. As can be seen in the figure, the crack guiding structure 250 according to the present embodiment is between the induction joints 33 and 33 and the induction embedding material 131 arranged in parallel to the wall section 34 including the installation line of each induction joint. 131, and two mounting rods 133a whose one end is attached to the separator 32a located on the right side of the guide embedding material 131 among the separators that maintain the distance between the molds 31 and 31. 133a, two mounting rods 133b, 133b having one end attached to the separator 32b located on the left side, the mounting rod 133a and the mounting rod 133b are connected to each other at the other end, and When two sets of female thread members for coupling 134 and positioning nuts 137 for coupling the guide embedding materials 131 and 131 at the coupling locations are provided. In, and a rod-shaped connecting member 251 as a connecting means for connecting the induction burying material 131, 131 of the two sheets which are arranged in parallel in the horizontal direction.

  The rod-shaped connecting member 251 has two bent portions 252 and 252 formed by bending both ends at right angles in the same direction, and the bent portions are inserted into the guide embedding materials 131 and 131, respectively. The guide embedding material can be integrated by being fitted into the insertion holes 132, 132.

  In the crack guiding structure 250 according to the present embodiment, as one guide embedding material 131 becomes two guide embedding materials 131 and 131, the mounting rods 133a and 133b, the connecting female screw member 134, the positioning 16 is substantially the same as the crack guiding structure 141 described in the fourth embodiment except that two sets of nuts 137, mounting members 139, 139, and nuts 138, 138 are required. Since the procedure is almost the same as that used, detailed description thereof will be omitted here. However, when attaching the rod-shaped connecting member 251, for example, the process of attaching the two attachment rods 133 b by the desired number of stages is different from that of the attachment step. Are attached to the guide embedding materials 131 and 131, and then together with the attachment rod 133b and the rod-like connecting member 251. It is conceivable Komu hanging induction burying material 131, 131 between the concrete 設空 in mold 31.

  The insertion holes for fitting the bent portions 252 and 252 of the rod-shaped connecting member 251 are the insertion holes 132 used for inserting the mounting rod 133 b out of the insertion holes 132 formed in the guide embedding material 131. Other insertion holes 132 may be used.

  As described above, according to the crack guiding structure 250 according to the present embodiment, in addition to the operational effects achieved by the crack guiding structure 141, the two guide embedding members 131 and 131 are integrated by the rod-shaped connecting member 251. As a result, the degree of fixation and the rigidity are increased, and thus the strength against the concrete side pressure and thus the positioning accuracy of the induction embedding material can be further increased.

  In the present embodiment, the example in which the guide embedding materials 131 and 131 are connected to each other by the rod-like connecting member 251 has been described. However, as shown in FIG. 27, the guide embedding materials 181 and 181 may be connected. As shown in FIG. 28, the guide embedment materials 211 and 211 may be connected.

  Even in such a configuration, in addition to the respective functions and effects described in the fourth embodiment, the two induction embedding materials 181 and 181 or the induction embedding materials 211 and 211 are integrated by the rod-shaped connecting member 251, respectively. As a result, the strength against the concrete side pressure and thus the positioning accuracy of the induction embedding material can be further enhanced.

  Further, in the present embodiment, the rod-shaped connecting members 251 are arranged horizontally, but are not necessarily arranged horizontally, and may be alternately arranged obliquely from the bottom to the top. In such a modified example, the rod-shaped connecting member acts as a brace, and the guide embedded members arranged side by side are firmly connected in the installed plane.

  Moreover, although this embodiment demonstrated the case where a pair of induction joint 33,33 was provided in the both sides | surfaces of the reinforced concrete wall 35, it replaces with this and the induction joint 33 is installed only in one side of the reinforced concrete wall 35. It may be applied to the case. The detailed description is the same as that of the first embodiment, and is omitted here.

The perspective view of the induction embedding material which concerns on 1st Embodiment. It is a figure of the induction embedding material which concerns on 1st Embodiment, (a) is a front view, (b) is a cross-sectional view which follows an AA line. The horizontal sectional view showing the condition of use of the induction embedding material concerning a 1st embodiment. The perspective view of the induction embedding material which concerns on 2nd Embodiment. It is a figure of the induction embedding material which concerns on 2nd Embodiment, (a) is a front view, (b) is a longitudinal cross-sectional view which follows a DD line, (c) is a cross-sectional view which follows a BB line, d) is a cross-sectional view along the line CC. The horizontal sectional view showing the condition of use of the induction embedding material concerning a 2nd embodiment. The figure which showed the effect | action of the shear resistance part 45. FIG. The perspective view which concerns on a modification. The perspective view of the induction embedding material which concerns on 3rd Embodiment. It is a figure of the induction embedding material which concerns on 3rd Embodiment, (a) is a front view, (b) is a longitudinal cross-sectional view which follows a GG line, (c) is a cross-sectional view which follows an EE line, d) is a transverse sectional view taken along line FF. The horizontal sectional view showing the condition of use of the induction embedding material concerning a 3rd embodiment. The perspective view of the induction embedding material used for 4th Embodiment. It is a figure of the induction embedding material used for 4th Embodiment, (a) is a front view, (b) is a cross-sectional view which follows a HH line. It is the figure which showed the crack induction structure which concerns on 4th Embodiment, (a) is the whole horizontal sectional view, (b) showed the connection condition using the internal thread member 134 for connection, and the nut 137 for positioning. Detail view. It is the figure which showed the crack induction structure which concerns on 4th Embodiment, (a) is a side view, (b) is the figure which showed the attachment condition to the separators 32a and 32b using the attachment member 139. The figure which showed the construction procedure of the crack induction structure which concerns on 4th Embodiment. The horizontal sectional view concerning a modification. The perspective view of the other induction embedding material used for 4th Embodiment. It is a figure of the other induction embedding material used for 4th Embodiment, (a) is a front view, (b) is a longitudinal cross-sectional view which follows a KK line, (c) is a cross-sectional view which follows an II line , (D) is a cross-sectional view along the line JJ. The horizontal sectional view which showed the crack induction structure which concerns on a modification. The perspective view of the other induction embedding material used for 4th Embodiment. It is a figure of the other induction embedding material used for 4th Embodiment, (a) is a front view, (b) is a longitudinal cross-sectional view which follows a NN line, (c) is a cross-sectional view which follows a LL line (D) is a cross-sectional view along the line NN. The horizontal sectional view which showed the crack induction structure which concerns on a modification. The perspective view which concerns on a modification. The perspective view which showed the rod-shaped connection member 251 used for 5th Embodiment. The horizontal sectional view showing the crack guidance structure concerning a 5th embodiment. The perspective view which showed the attachment condition of the other induction embedding material used for 5th Embodiment, and the rod-shaped connection member 251. FIG. The perspective view which showed the attachment condition of the other induction embedding material used for 5th Embodiment, and the rod-shaped connection member 251. FIG.

Explanation of symbols

1, 41, 91, 131, 181, 211
Guiding material 2, 42, 92 Embedding material body 3, 43 Stiffening portion 4, 44, 94 Plate-shaped guiding portion 31 Mold frame 32a, 32b Separator 33 Induction joint 45 Shear resistance portion 46 Recessed portion 47 Convex portion 132 Insertion hole, insertion Holes 141, 201, 231 and 250 Crack guiding structure 133a Mounting rod (first mounting rod)
133b Mounting rod (second mounting rod)
134 Female thread member for connection (connection means)
135a Female thread (first female thread)
135b Female thread (second female thread)
136 bag
137 Positioning nut (connecting means)
138 Nut 139 Mounting member 251 Rod-shaped connecting member (connecting means)

Claims (10)

In the induction embedding material to be embedded along the wall section in the vicinity of the induction joint provided on the side surface of the concrete wall and including the installation line of the induction joint,
An embedding material body having a long plate shape, and both sides of the embedding material body so as to have a cross-sectional shape that is bent or curved along the short direction of the embedding material body and has the same cross-sectional shape in the longitudinal direction. And a pair of plate-like guide portions respectively extending outside the respective stiffening portions so as to be parallel to the formation surface of the embedding material main body. Induction embedding material. A plurality of shear resistance portions are formed in a row along the longitudinal direction of the embedment material main body so as to be concave on the front side of the embedment material main body and to be convex on the back side. The shear resistance portion is configured such that a two-way shear key is formed between the concrete and the concrete around the convex portion on the back surface side along the longitudinal direction and the short direction of the embedded material body. Induction embeds. In the induction embedding material to be embedded along the wall section in the vicinity of the induction joint provided on the side surface of the concrete wall and including the installation line of the induction joint,
An embedding material body formed in a long plate shape, and a pair of plate-shaped guide portions respectively extending outside the embedding material body so as to be parallel to a forming surface of the embedding material body. A plurality of shear resistance portions are formed in a row along the longitudinal direction of the embedding material main body so as to be concave on the front side of the material main body and convex on the back side, and in the embedded state, the concrete in the concave portion The shear resistance portion is configured such that a two-way shear key is formed along a longitudinal direction and a short side direction of the embedding material main body with concrete around the convex portion on the back side. Embedding material. The shear resistance portion is formed in a rectangular flat bottom shape, and the short side direction is aligned with one of the short side direction and the long side direction of the embedded material body, and the long side direction is aligned with the other direction of the embedded material body. The induction embedding material according to claim 2 or claim 3. The induction embedding according to claim 2 or 3, wherein the plurality of shear resistance portions are formed so as to have the same arrangement interval and shape, and the convex portions are fitted into the concave portions when stacked. Wood. 6. The induction embedding material according to any one of claims 1 to 5, an attachment rod having one end attached to a separator that holds a gap between the molds, and the other end or an intermediate position of the attachment rod is guided to the induction rod. Connecting means connectable to the embedment material, and the connecting means is configured so that the connection position of the mounting rod with respect to the guide embedment material is adjustable along the material axis direction of the mounting rod, A crack guiding structure characterized in that an insertion hole through which the connecting means or the mounting rod is inserted is formed in an embedding material body of the guiding embedding material. Among the induction embedding material according to any one of claims 1 to 5 and a separator for maintaining a space between the molds, one end is attached to each of the separators located on the left and right sides of the induction embedding material. The first mounting rod and the second mounting rod, and the first mounting rod and the second mounting rod are connected to each other at the other end, and the guide embedding material is connected to the connecting portion. Connecting position of the first mounting rod or the second mounting rod with respect to the guide embedding material is the material of the first mounting rod or the second mounting rod. The connecting means is configured to be adjustable along the axial direction, and the first mounting rod, the second mounting rod, or the connection is mounted on the embedded body of the guide embedded material. Crack guiding structure, characterized in that stage to form an insertion hole to be inserted. The connecting means includes a first female screw into which the other end of the first mounting rod is screwed and a second female screw into which the other end of the second mounting rod is screwed. A constricted portion formed and abutted against the guide embedding material is screwed into the connecting female screw member formed on the end face of the second female screw and the other end of the second mounting rod. The crack induction structure according to claim 7, comprising a positioning nut for tightly attaching the induction embedding material to a narrow portion. A mounting member having a U-shaped cross section, which has a pair of opposed flat plate portions and is formed so that the separator is passed between the pair of flat plate portions and has an insertion hole formed in each of the flat plate portions. The crack guiding structure according to claim 6 or 7, wherein the mounting rod, the first mounting rod, or the second mounting rod is configured to be freely inserted into the insertion hole. A rod-shaped connecting member having two bending portions formed by bending the both ends of the connecting means at right angles in the same direction, comprising connecting means for connecting the induction embedding materials to each other in a state where the induction embedding materials are embedded in parallel. The crack induction structure according to any one of claims 6 to 9, wherein the induction embedding material is formed with insertion holes into which the bent portions are inserted.

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