JP7210052B2 - Fixtures for induced joint members - Google Patents

Description

TECHNICAL FIELD The present invention relates to a crack-inducing joint structure used for countermeasures against temperature cracks in concrete structures, and particularly belongs to the technical field of structures for fixing inducing joint members to reinforcing bars.

Most concrete expands due to reaction heat when water and cement react during the curing process, and shrinks along with curing as the reaction subsides. When it shrinks, it is restrained by pre-cast concrete (bottom slab concrete, etc.), and countless cracks occur in the wall. Cracks adversely affect the durability of concrete structures, such as corrosion of reinforcing bars installed inside. Also, if the concrete structure is a water tank, the watertightness will be lowered.

As described above, since temperature cracks in concrete structures have a great adverse effect, various countermeasures against cracks have been implemented. Crack-induced joints are one of the countermeasures against temperature cracks. Compared to other crack countermeasures, crack-induced joints are highly effective. used for wall-like structures in

Crack-inducing joints are provided in a wall-like structure at regular intervals in the longitudinal direction, and by inducing cracks in the cross-sectional loss portions, cracks in other portions are suppressed. There are two types of induced joint members that constitute such crack induced joints, for example, an outer induced joint member that is installed in a reinforcing bar covering portion of a concrete structure and an inner induced joint member that is installed inside the reinforcing bar. The combination of the outer induced joint member and the inner induced joint member is selected according to the wall thickness to ensure the desired cross-sectional loss ratio.

Patent Literature 1 discloses a structure in which an outer induced joint member and an inner induced joint member are bound and fixed to reinforcing bars with binding wires. Further, Patent Document 2 discloses a structure in which an outer induced joint member is fastened and fixed to a concrete formwork panel with bolts and nuts.

Japanese Patent No. 2868994 Japanese Patent No. 4764736

As mentioned above, induced joint materials are used as countermeasures against temperature cracks in concrete, but the construction industry is facing serious problems such as securing workers and lack of skilled workers due to the declining birthrate and aging population.

In the case of a large concrete structure, the induced joint member may be installed on the order of several thousand meters.

In this regard, in the case of fixing with a binding wire in Patent Document 1, there are problems in that a special tool called a hacker is required and that the installation work takes time. In addition, in the case of fixing with a bolt and nut in Patent Document 2, a ratchet is required, and the work of hooking the thread to the thread groove and the adjustment of the force at the time of tightening are necessary, and the work is complicated.

The present invention has been made in view of the above points, and an object of the present invention is to enable a induced joint material to be securely fixed to a reinforcing bar with a simple operation.

In order to achieve the above object, in a first aspect of the present disclosure, a vertically elongated induced joint member disposed inside a wall-like structure made of concrete is disposed inside the wall-like structure. A fixture of the induced joint member for fixing to the horizontally extending rebar can be provided. The fixture has a first clamping portion and a second clamping portion that abut on the outer peripheral surface of the reinforcing bar to clamp the reinforcing bar in the vertical direction, and a reinforcing bar mounting section made of an elastic metal material. and an induced joint member mounting portion having a first engaging portion and a second engaging portion that engage with one end portion and the other end portion in the width direction of the induced joint member, respectively. The reinforcing bar mounting portion has a fixing portion fixed to the induced joint member mounting portion, and the first sandwiching portion protrudes from the upper portion of the fixing portion and extends from above the upper portion of the outer peripheral surface of the reinforcing bar. The projection direction middle part is positioned at the top, and the projection direction middle part is positioned lower as the projection direction middle part approaches the projection direction base end and the projection direction middle part is closer to the projection direction tip part. The first clamping portion is provided with an opening extending from the protruding direction proximal end side to the protruding direction distal end side, and the opening is positioned on the protruding direction distal end side of the opening. A first claw portion that protrudes toward the protruding direction base end portion and engages with the outer peripheral surface of the reinforcing bar is formed on the peripheral edge portion, and the second holding portion protrudes from the lower portion of the fixing portion, and the It is formed so as to abut on the lower part of the outer peripheral surface of the reinforcing bar from below, and the intermediate portion in the projecting direction is positioned at the lowest point, and the distance from the intermediate portion in the projecting direction to the base end in the projecting direction and the intermediate portion in the projecting direction The second clamping portion is provided with an opening extending from the protruding direction proximal end side to the protruding direction distal end side. and a peripheral edge portion located on the distal end side in the projecting direction of the opening projecting toward the proximal end portion in the projecting direction and below the portion of the outer peripheral surface of the reinforcing bar where the first claw portion is locked. A second claw portion is formed to engage with the portion, and the vertical separation dimension between the projecting direction intermediate portion of the first clamping portion and the projecting direction intermediate portion of the second clamping portion is larger than the outer diameter dimension of the reinforcing bar. set short.

According to this configuration, the reinforcing bar attachment section is attached to the reinforcing bar by sandwiching the reinforcing bar between the first sandwiching section and the second sandwiching section of the reinforcing bar attachment section. Then, by engaging the width direction one end and the other end of the induced joint member with the first engaging portion and the second engaging portion of the induced joint member mounting portion fixed to the reinforcing bar mounting portion, respectively A joint member is attached to the induced joint member attachment portion. Therefore, when the induced joint member is attached to the reinforcing bar, there is no need for binding wires, bolts, or nuts, so hackers and ratchets are not required.

In addition, the reinforcing bars extending in the horizontal direction can be clamped vertically by the first clamping portion and the second clamping portion. As a result, it is possible to avoid vertical displacement of the reinforcing bar mounting portion.

In a second aspect of the present disclosure, the induced joint member mounting portion is made of a plate member extending from one widthwise end portion to the other end portion of the induced joint member. The first engaging portion is configured by bending a portion of the plate member corresponding to one end portion in the width direction of the induced joint member toward the other end portion side, and the second engaging portion is configured by It is constructed by bending a portion of the plate member corresponding to the other end in the width direction of the induced joint member toward the one end.

According to this configuration, in a state in which the induced joint member is inserted between the first engaging portion and the second engaging portion, one end portion and the other end portion in the width direction of the induced joint member are connected to the first engaging portion and the second engaging portion, respectively. It can be engaged so as to be hooked on the second engaging portion. This makes it difficult for the induced joint member to come off.

In the third aspect of the present disclosure, the fixed portion of the reinforcing bar attachment portion is fixed to a portion of the plate member corresponding to a widthwise intermediate portion of the induced joint member. The plate member includes a first plate portion formed so as to separate from the reinforcing bar as it approaches the first engaging portion from a portion where the fixing portion is fixed, and a portion where the fixing portion is fixed to the second engaging portion. and a second plate portion formed so as to separate from the reinforcing bar as it approaches the joint.

According to this configuration, since the first engaging portion and the second engaging portion can be separated from the reinforcing bar toward the outer side in the thickness direction of the wall-like structure, the induced joint member is also separated from the reinforcing bar in the thickness direction of the wall-like structure. You can release it to the outside. Therefore, for example, when the concrete covering of the wall-like structure is thick, the inducing joint member can be brought closer to the surface of the wall-like structure, thereby improving the effect of inducing cracks at desired locations.

A fourth aspect of the present disclosure is characterized in that the plate material has elasticity.

According to this configuration, it is possible to elastically deform the first plate portion and the second plate portion. Since the first plate portion and the second plate portion are formed so as to be separated from the reinforcing bar attachment portion, by elastically deforming them, the distance between the first engaging portion and the second engaging portion can be widened. . For example, in a state where one end in the width direction of the induced joint member is engaged with the first engaging portion, the first plate portion or the second plate portion is elastically deformed to separate the first engaging portion and the second engaging portion. By widening the distance, the other end of the induced joint member can be engaged with the second engaging portion. After that, by restoring the shape of the first plate portion or the second plate portion, the drop-off of the induced joint member is suppressed.

In the fifth aspect of the present disclosure, the plate material is formed flat from a portion corresponding to one widthwise end of the induced joint member to a portion corresponding to the other widthwise end.

According to this configuration, since the plate material has a flat shape from the first engaging portion side to the second engaging portion side, a force acts on the first engaging portion and the second engaging portion in directions separating from each other. In other words, relative displacement between the first engaging portion and the second engaging portion can be suppressed. As a result, for example, in the case of a structure in which the induced joint member has a V shape and can be elastically deformed so as to contract the induced joint member in the width direction, the induced joint member is contracted in the width direction and the first After engaging the first engaging portion and the second engaging portion, when maintaining the engaged state by the restoring force of the induced joint member, the width direction one end portion and the other end portion of the induced joint member are engaged in the first engagement. can be firmly engaged with the part and the second engaging part.

In a sixth aspect of the present disclosure, the induced joint member attachment portion is a portion to which an outer induced joint member disposed outside the reinforcing bars inside the wall-like structure is attached. The reinforcing bar mounting portion abuts on a plate-shaped inner induced joint member disposed inside the reinforcing bar inside the wall-like structure and extending in the thickness direction and the vertical direction of the wall-like structure, It has a positioning part for positioning the outer trigger joint member so that the widthwise central portion of the outer trigger joint member is positioned on the extension line of the inner trigger joint member.

According to this configuration, when the outer induced joint member is attached to the induced joint member mounting portion while the positioning portion of the reinforcing bar mounting portion is in contact with the inner induced joint member, the width direction central portion of the outer induced joint member is Positioned in extension of the inner induced joint member. As a result, the plate-like inner induced joint member and the outer induced joint member are arranged in a straight line, and the effect of inducing cracks at desired locations is improved.

As described above, the reinforcing bars are clamped by the first clamping part and the second clamping part, and the first engaging part and the second engaging part are engaged with the one end and the other end in the width direction of the induced joint member, respectively. As a result, the induced joint member can be reliably fixed to the reinforcing bar with a simple operation.

FIG. 2 is a perspective view showing an example of fixing an induced joint member using the fixture for the induced joint member according to the embodiment of the present invention; FIG. 2 is a horizontal cross-sectional view of the induced joint structure when the outer induced joint member according to the first example is arranged; It is the figure which looked at the outside induced joint member which concerns on a 1st example from upper direction. FIG. 3 is a view equivalent to FIG. 2 when the outer side induced joint member according to the second example is arranged; It is the figure which looked at the outside induction joint member which concerns on a 2nd example from upper direction. FIG. 4 is a side view of a fixture for the induced joint member according to the first example; FIG. 4 is a plan view of a fixture for the induced joint member according to the first example; FIG. 8 is a view equivalent to FIG. 7 showing a state in which the triggering joint member is fixed to the fixture for the triggering joint member according to the first example. FIG. 8 is a view equivalent to FIG. 7 for explaining how to fix the triggering joint member to the fixture for the triggering joint member according to the first example; FIG. 10 is a plan view of a fixture for a triggering joint member according to a second example; FIG. 11 is a view equivalent to FIG. 10 showing a state in which the triggering joint member is fixed to the fixture for the triggering joint member according to the second example.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings. It should be noted that the following description of preferred embodiments is essentially merely illustrative, and is not intended to limit the invention, its applications, or its uses.

FIG. 1 is a perspective view showing an example of fixing an induced joint member 50 using a induced joint member fixture 1 according to an embodiment of the present invention. In the description of this embodiment, the structure of a concrete wall-like structure (RC concrete structure) 100 will be described before describing the structure of the fixture 1 for the induced joint member.

(Structure of wall-like structure)
The wall-like structure 100 includes concrete 101 that is cast and hardened in a formwork (not shown) placed on a base concrete (not shown) that is, for example, precast concrete. The wall-like structure 100 is, for example, a wall of a building, a water stop wall, a wall of a water tank, or the like, but is not limited thereto, and may be a wall or a structure having a shape close to a wall.

The wall-like structure 100 may have a thickness of, for example, several tens of cm to 1 m or more. Inside the wall-like structure 100, a plurality of main reinforcing bars 102 extending in the vertical direction and a plurality of reinforcing bars 103 extending in the horizontal direction are arranged as reinforcing steel bars. A plurality of main reinforcing bars 102 are arranged at intervals in the longitudinal direction of the wall-like structure 100 . Moreover, the plurality of reinforcing bars 103 are arranged at intervals in the height direction of the wall-like structure 100 and fixed to the plurality of main reinforcing bars 102 by binding wires or the like. The main reinforcing bars 102 and the reinforcing bar arrangement 103 are arranged in a portion away from the central portion in the thickness direction of the wall-like structure 100 to one side and in a portion away from the central portion in the thickness direction to the other side. The main reinforcement 102 and the reinforcement arrangement 103 and the main reinforcement 102 and the reinforcement arrangement 103 on the other side are arranged at predetermined intervals in the thickness direction of the wall-like structure 100 .

In the case of the thick wall-like structure 100 as described above, cracks occur in the wall-like structure 100 due to restraint by the existing bottom slab concrete when the concrete shrinks after placing. It is difficult to prevent the occurrence of such cracks. Therefore, a crack-inducing joint structure is applied to the wall-like structure 100 as a technique for generating cracks so as not to reduce the durability of the wall-like structure 100 rather than preventing the cracks themselves from occurring. The wall-like structure 100 according to the present embodiment is provided with an outer triggering joint member 50 and an inner triggering joint member 60 for inducing cracks in order to generate cracks only at desired locations. A plurality of sets of the outer induced joint member 50 and the inner induced joint member 60 can be provided at predetermined intervals in the longitudinal direction of the wall-like structure 100 .

The outer induced joint member 50 is fixed to the bar arrangement 103 by a fixture 1, which will be described later. Therefore, the wall-like structure 100 includes concrete 101 , main reinforcing bars 102 , bar arrangement 103 , outer induced joint members 50 , inner induced joint members 60 and fixtures 1 .

(Induced joint member)
The outer induced joint member 50 is a covering portion outside the thickness direction of the wall-like structure 100 from the main reinforcement 102 and the reinforcement arrangement 103 on one side, and the wall-like structure 100 from the main reinforcement 102 and the reinforcement arrangement 103 on the other side. They are arranged in covering portions on the outside in the thickness direction. In addition, the inner side induced joint material 60 is located inside the wall-like structure 100 in the thickness direction of the main reinforcement 102 and the reinforcement 103 on one side, and the thickness of the wall-like structure 100 relative to the main reinforcement 102 and the reinforcement 103 on the other side. They are arranged on the inner side of the direction. Therefore, in this embodiment, two outer induced joint members 50 and two inner induced joint members 60 are arranged linearly in the thickness direction of the wall-like structure 100 . The outer induced joint member 50 and the inner induced joint member 60 are members for inducing a crack in the wall-like structure 100 by causing a cross-sectional loss inside the wall-like structure 100. can also be called Although not shown, another similarly constructed induced joint material may be disposed between the two inner induced joint materials 60 . Also, the inner induced joint material 60 may be provided as required, and may be omitted.

The inner induced joint material 60 is formed of a plate-like member that extends in the thickness direction of the wall-like structure 100 and also extends in the vertical direction. As shown in FIG. 2, the inner induced joint material 60 includes a core material 61 and adhesive layers 62 attached to both sides of the core material 61, respectively. The core material 61 only needs to be rigid enough not to be deformed by the flowing concrete when the concrete is poured, and can be made of a rigid material such as metal, hard rubber, or hard plastic. The adhesive layer 62 is made of a polymer material that adheres to concrete, and can be made of, for example, butyl rubber. A butyl rubber-based pressure-sensitive adhesive is preferable because of its high adhesiveness to concrete.

From the viewpoint of securing the length necessary for the cross-sectional loss, the inner side induced joint material 60 is sufficient if it is embedded inside the wall-like structure 100 as a foreign matter, so it is composed only of the core material 61 described above. may However, since cracks also occur along the inner side induced joint material 60, from the viewpoint of more completely preventing water leakage from these cracks, an adhesive layer 62 is formed on the inner side induced joint material 60, and a core material 61 is formed. It is preferable to cover at least a part of or

The inner induced joint material 60 is provided with a fixed portion 60 a fixed to the bar arrangement 103 . The fixed portion 60 a is formed by bending the end portion of the core material 61 along the reinforcing bar 103 . For example, a through hole (not shown) is provided in the fixed portion 60a, a binding wire (not shown) is inserted through the through hole, and the fixed portion 60a is bound to the reinforcing bar 103 by the binding wire. be able to. In addition to fixing by the fixed portion 60 a , the inner induced joint material 60 can be fixed to the bar arrangement 103 by the fixing metal fittings 63 . The fixing metal fitting 63 is a metal fitting for fixing the end portion of the inner induced joint member 60 on the side opposite to the fixed portion 60a to the reinforcing bar 103, and can be composed of a wire rod such as a wire.

(Outside induced joint member according to the first example)
1 to 3 show an outer induced joint member 50 according to a first example. The outer induced joint member 50 according to the first example includes a vertically extending core material 51 and an adhesive layer 52 for ensuring water stoppage. The core material 51 and the adhesive layer 52 of the outer induced joint member 50 are made of the same materials as the core material 51 and the adhesive layer 52 of the inner induced joint material 60, respectively, but the shape of the inner induced joint material 60 is different. is different. That is, the core material 51 of the outer induced joint member 50 includes a projecting portion 51a projecting outward in the thickness direction of the wall-like structure 100 and a pair of projecting plate portions 51b, 51b extending away from the projecting portion 51a. and The width direction of the outer induced joint member 50 is the extending direction of the extending plate portions 51b, 51b, that is, the direction along the axial direction of the bar arrangement 103. As shown in FIG.

The horizontal cross-sectional shape of the core material 51 is the same from the lower end to the upper end of the core material 51 . The protruding portion 51a of the core member 51 and the pair of extended plate portions 51b, 51b can be configured by one plate member, but not limited to this, and may be configured by connecting a plurality of plate members.

As shown in FIG. 3, the width of the projecting portion 51a is set to be substantially the same from the base end portion in the projecting direction to the tip end portion of the projecting portion 51a. The protrusion amount of the protruding portion 51a can be set to an arbitrary amount so as to obtain a desired cross-sectional loss rate. The pair of extending plate portions 51b, 51b extend in a direction (width direction) substantially orthogonal to the projecting direction of the projecting portion 51a, and have substantially the same dimension in the extending direction. Therefore, the projecting portion 51a is positioned at the widthwise central portion of the outer induced joint member 50. As shown in FIG. Further, the pair of extension plate portions 51b, 51b are positioned on substantially the same plane extending in the width direction of the outer trigger joint member 50. As shown in FIG. The adhesive layer 52 of the outer induced joint member 50 is continuously provided from the outer surface of the projecting portion 51a to the extending plate portions 51b, 51b.

The outer induced joint member 50 has a relative positional relationship with the inner induced joint member 60 so that the widthwise central portion of the outer induced joint member 50, that is, the protrusion 51a is positioned on the extension line of the inner induced joint member 60. is set. As a result, a predetermined cross-sectional loss rate can be obtained inside the wall-like structure 100 by the protruding portion 51a of the outer induced joint member 50 and the inner induced joint member 60, so that cracks are generated at desired positions. increases even further.

Further, as shown in FIG. 1, embedded decorative joint fillers 70, 70 are provided on one side surface and the other side surface in the thickness direction of the wall-like structure 100, respectively. The embedded decorative joint material 70 is a member for creating a cross-sectional defect on the surface of the wall-like structure 100, and is elongated in the vertical direction. The embedded decorative joint material 70 is made of, for example, a resin material having excellent weather resistance. The embedded decorative joint material 70 is also located on the extension line of the inner induced joint material 60 . By shortening the distance between the embedded decorative joint material 70 and the projecting portion 51a of the outer induced joint member 50, it becomes easier to generate cracks as intended.

(Outside induced joint member according to the second example)
4 and 5 show an outer induced joint member 80 according to a second example. The outer induced joint member 80 according to the second example differs from the outer induced joint member 50 of the first example in the shape of the protrusion. That is, the outer induced joint member 80 of the second example includes a vertically extending core member 81 and an adhesive layer 82 . The width of the protruding portion 81a formed on the core member 81 is set to be wider toward the proximal end in the projecting direction and narrower toward the distal end in the projecting direction. Therefore, the horizontal cross section of the projecting portion 81a has a shape close to a triangle, and the base end portion of the projecting portion 81a is open. The plate portion is elastically deformed, and the widthwise dimension of the projecting portion 81a is shortened. Further, since a pair of extending portions 81b, 81b are formed at the base end portion of the protruding portion 81a so as to extend in mutually opposite directions, when the dimension in the width direction of the protruding portion 81a is shortened, the pair of The interval between the extensions 81b, 81b is narrowed, so that the dimension of the outer induced joint member 80 in the width direction is shortened.

The outer induced joint member 80 is positioned on the extension line of the inner induced joint member 60 so that the center portion in the width direction of the outer induced joint member 80, that is, the tip portion in the projecting direction of the projecting portion 81a is positioned on the extension line of the inner induced joint member 60. A relative positional relationship is set. As a result, a predetermined cross-sectional loss rate can be obtained, so that the effect of generating cracks at desired positions is further enhanced. The embedded decorative joint material 70 can also be provided in the case of the outer induced joint member 80 according to the second example.

(Fixture for induced joint member according to the first example)
Next, the structure of the induced joint member fixture 1 for fixing the outer induced joint member 50 according to the first example shown in FIGS. 1 and 2 to the bar arrangement 103 will be described. As shown in FIG. 1 , since one outer induced joint member 50 has a shape elongated in the vertical direction, bar arrangement is performed at a plurality of locations separated in the vertical direction of one outer induced joint member 50 by the fixtures 1 respectively. 103, 103, . . . Since the fasteners 1 are the same, the structure of one of the fasteners 1 will be described in detail below.

As shown in FIG. 2, the fixture 1 includes a reinforcing bar attachment portion 2 attached to a horizontally extending bar arrangement 103, and an induced joint member attachment portion 3 to which an outer induced joint member 50 is attached. The member attachment portion 3 is integrated by being fixed to the reinforcing bar attachment portion 2 . The reinforcing bar mounting portion 2 is made of an elastic metal material, and has a first clamping portion 21 and a second clamping portion 22 that contact the outer peripheral surface of the reinforcing bar 103 to clamp the reinforcing bar 103 . are doing. The first clamping portion 21 and the second clamping portion 22 are each capable of bending and deforming in the vertical direction.

As shown in FIG. 6 , the reinforcing bar mounting portion 2 has a fixing portion 20 that is fixed to the induced joint member mounting portion 3 . The fixing portion 20, the first clamping portion 21 and the second clamping portion 22 are integrally molded as one member. The fixed portion 20 is a portion fixed to the induced joint member mounting portion 3 by welding, various fastening members, a claw fitting structure, or the like. The first holding portion 21 is formed to protrude from the upper portion of the fixing portion 20 and abut against the upper portion of the outer peripheral surface of the bar arrangement 103 from above. The first clamping portion 21 is curved such that the intermediate portion in the projecting direction is located at the top, and is positioned downwardly from there toward the base end portion in the projecting direction and toward the distal end portion. This curved shape substantially corresponds to the shape of the upper side of the outer peripheral surface of the bar arrangement 103 .

On the other hand, the second holding portion 22 is formed so as to protrude from the lower portion of the fixing portion 20 and abut against the lower portion of the outer peripheral surface of the bar arrangement 103 from below. The second holding portion 22 is curved such that the intermediate portion in the projecting direction is located at the lowest point, and the portion is located upward toward the base end portion in the projecting direction and toward the distal end portion. This curved shape substantially corresponds to the shape of the lower side of the outer peripheral surface of the bar arrangement 103 .

The bar arrangement 103 is vertically (radially) sandwiched between the projecting direction intermediate portion of the first sandwiching portion 21 and the projecting direction intermediate portion of the second sandwiching portion 22 . That is, the vertical separation dimension between the projecting direction middle portion of the first clamping portion 21 and the projecting direction middle portion of the second clamping portion 22 is set to be shorter than the outer diameter dimension of the bar arrangement 103 . By pushing 103 between the first clamping part 21 and the second clamping part 22, the first clamping part 21 and the second clamping part 22 are elastically deformed to widen the gap between them. This allows the bar arrangement 103 to be placed between the first clamping portion 21 and the second clamping portion 22 . After placing the bar arrangement 103 between the first holding part 21 and the second holding part 22 , the reinforcing force of the first holding part 21 and the second holding part 22 causes the bar arrangement 103 to move toward the first holding part 21 . and the second holding portion 22 . The clamping force at this time can be arbitrarily set depending on the type of material, the thickness and width of the first clamping part 21 and the second clamping part 22, etc. In this embodiment, the weight of the fixed outer induced joint member 50 The clamping force is set so that the position of the outer induced joint member 50 does not shift.

As shown in FIG. 7, the first clamping portion 21 is provided with a plurality of openings 21a, but the openings 21a may be provided as required and may be omitted. A first claw portion 21b that protrudes downward is formed in a portion of the first holding portion 21 near the tip in the direction of protrusion. As shown in FIG. 6 , the first claw portion 21 b is a portion that engages with the outer peripheral surface of the reinforcing bar 103 . Movement in the axial direction and rotation of the reinforcing bar attachment portion 2 in the circumferential direction of the bar arrangement 103 can be suppressed. The first claw portion 21b can be provided on the peripheral portion of the opening portion 21a. The second clamping portion 22 also has an opening (not shown) similar to that of the first clamping portion 21 and a second claw portion 22b. The first claw portion 21b and the second claw portion 22b may be provided as necessary, and may be omitted.

As shown in FIG. 2 , one edge of the first clamping portion 21 in the direction intersecting the protruding direction serves as a positioning portion 21 c that abuts on the inner induced joint material 60 . The fixing tool 1 is positioned in the axial direction of the bar arrangement 103 (longitudinal direction of the wall-like structure 10) by the positioning part 21c coming into contact with the side surface of the inner trigger joint member 60. As shown in FIG. When the fixture 1 is positioned in the axial direction of the bar arrangement 103, the outer induced joint member 50 attached to the fixture 1 is also positioned in the same direction, and the positioned outer induced joint member is positioned. The relative positional relationship of the reinforcing bar mounting portion 2 with respect to the induced joint member mounting portion 3 is set so that the width direction central portion of 50 is positioned on the extension line of the inner induced joint member 60 . That is, the positioning portion 21c of the reinforcing bar attachment portion 2 abuts on the inner induced joint member 60, and the outer induced joint member 50 is positioned on the extension line of the inner induced joint member 60 so that the width direction central portion of the outer induced joint member 50 is positioned. This is the part for positioning the member 50 . Since the second clamping portion 22 is also provided with a similar positioning portion (not shown), two positioning portions 21c separated from each other in the vertical direction come into contact with the inner trigger joint member 60. . The positioning portion 21c may be configured by, for example, a surface extending in the vertical direction.

As shown in FIG. 8, the induced joint member mounting portion 3 is composed of a plate member 30 extending from one end portion in the width direction of the outer induced joint member 50 to the other end portion. The material forming the plate member 30 may have elasticity, and examples thereof include metals, hard resins, and combinations thereof. The material forming the plate material 30 and the material forming the core material 51 of the outer induced joint member 50 may be the same. The width direction of the plate material 30 and the width direction of the outer induced joint member 50 are the same. A flat plate portion 31 to which the fixing portion 20 of the reinforcing bar attachment portion 2 is fixed is provided at the intermediate portion in the width direction of the plate member 30 . The flat plate portion 31 extends vertically and extends substantially flat in the width direction of the plate member 30 . A fixing portion 20 of the reinforcing bar attachment portion 2 is fixed to the vertical intermediate portion of the flat plate portion 31 .

The flat plate portion 31 is deviated from the widthwise central portion of the plate portion 30 to one side in the widthwise direction by a predetermined amount, not from the widthwise central portion of the plate portion 30 . Since the fixed portion 20 is fixed to the flat plate portion 31 , the reinforcing bar mounting portion 2 is also shifted to one side in the width direction by shifting the flat plate portion 31 to one side in the width direction. As described above, the amount of displacement of the reinforcing bar mounting portion 2 to one side in the width direction (the above-mentioned predetermined amount) is determined by a state in which the positioning portion 21c of the reinforcing bar mounting portion 2 is in contact with the side surface of the inner induced joint member 60. It is set so that the widthwise central portion of the outer induced joint member 50 is positioned on the extension line of the inner induced joint member 60 .

The plate member 30 has a flat plate portion 31 , a first plate portion 32 , a second plate portion 33 , a first engaging portion 34 and a second engaging portion 35 . The flat plate portion 31, the first plate portion 32, the second plate portion 33, the first engaging portion 34, and the second engaging portion 35 are portions obtained by press-molding one plate material 30. We are trying to reduce the number of parts by The first engaging portion 34 is provided at one end in the width direction of the plate member 30 and is a portion that engages with one end in the width direction of the outer induced joint member 50 . The first engaging portion 34 is formed by bending a portion of the plate member 30 corresponding to one end in the width direction of the outer trigger joint member 50 toward the other end. It is possible to engage by hooking one end.

The second engaging portion 35 is provided at the other widthwise end portion of the plate member 30 and is a portion that engages with the other widthwise end portion of the outer induced joint member 50 . The second engaging portion 35 is formed by bending a portion of the plate 30 corresponding to the other end in the width direction of the outer trigger joint member 50 toward the one end side. It is possible to engage by hooking the other end. As shown in FIG. 7, the width dimension (H2) of the second engaging portion 35 is narrower than the width dimension (H1) of the first engaging portion 34, but the first engaging portion 34 and the second engaging portion 34 The engaging portions 35 are both formed to securely hook onto the outer induced joint member 50 .

The first engaging portion 34 and the second engaging portion 35 are continuously provided in the vertical direction. As a result, it is possible to ensure a wide contact area between the outer triggering joint member 50 and the first engaging portion 34 and the second engaging portion 35, so that the outer triggering joint member 50 in the fixed state can be stabilized. can. In addition, since the first engaging portion 34 and the second engaging portion 35 are provided by bending one end portion and the other end portion in the width direction of the plate member 30, the strength of the one end portion and the other end portion in the width direction of the plate member 30 is increased. can increase Note that the first engaging portion 34 and the second engaging portion 35 may be intermittently provided in the vertical direction.

The relative positional relationship between the first engaging portion 34 and the second engaging portion 35 is set so that they are positioned on the same vertical plane parallel to the axis A (shown in FIG. 7) of the bar arrangement 103. It is That is, the separation distance of the first engaging portion 34 from the axis A of the reinforcement 103 in the radial direction (radial direction of the reinforcement 103) and the radial direction of the second engaging portion 35 from the axis A of the reinforcement 103 (reinforcement 103 in the radial direction) is set to be the same. As a result, the extending plate portions 51b, 51b of the outer triggering joint member 50 are attached to the bar arrangement 103 by engaging the outer triggering joint member 50 with the first engaging portion 34 and the second engaging portion 35. It is arranged in parallel with the bar arrangement 103 .

The first plate portion 32 is formed so as to separate from the bar arrangement 103 as it approaches the first engaging portion 34 from one widthwise edge of the flat plate portion 31 (the portion to which the reinforcing bar attachment portion 2 is fixed). In addition, the second plate portion 33 is formed so as to separate from the bar arrangement 103 as it approaches the second engaging portion 35 from the other widthwise edge portion of the flat plate portion 31 (the portion where the reinforcing bar attachment portion 2 is fixed). there is Therefore, both the first plate portion 32 and the second plate portion 33 are configured as inclined plate portions that are inclined with respect to the axis A of the bar arrangement 103, but the inclination direction of the first plate portion 32 and the second plate portion Since the inclination direction of the plate portion 33 is the opposite direction, the base end portion of the first plate portion 32 and the base end portion of the second plate portion 33 are closest to each other, and the tip end portion of the first plate portion 32 and the tip portion of the second plate portion 33 are in a positional relationship that is the farthest from each other.

When the outer trigger joint member 50 is not fixed, the first plate portion 32 has a fixed end near its base end and a free end at its tip. By pressing the first plate portion 32 in the thickness direction, the first plate portion 32 can be bent and deformed by its elasticity. After flexural deformation due to elasticity, the shape is restored when the force is removed. The second plate portion 33 can also be flexurally deformed in the elastic region. In addition, since the width of the second plate portion 33 is shorter than the width of the first plate portion 34, the second plate portion 33 is more flexurally deformed with a smaller force.

As shown in FIG. 7 , the width dimension (H3) of the first plate portion 32 is shorter than the width dimension (H4) of the second plate portion 33 . This is due to the fact that the flat plate portion 31 is displaced to one side in the width direction of the plate portion 30 by a predetermined amount. On the other hand, as described above, the separation distance between the reinforcement arrangement 103 and the first engaging portion 34 and the separation distance between the reinforcement arrangement 103 and the second engaging portion 35 are the same. Therefore, the inclination of the first plate portion 32 with respect to the reinforcement arrangement 103 (axis) is steeper than the inclination of the second plate portion 34 with respect to the reinforcement arrangement 103 (axis).

By inclining the first plate portion 32 and the second plate portion 33 as described above, the first engaging portion 34 and the second engaging portion 34 provided at the tip portions of the first plate portion 32 and the second plate portion 33, respectively. The engaging portion 35 can be separated from the bar arrangement 103 . As a result, the outer induced joint member 50 can be brought closer to the surface of the wall-like structure 100, that is, the embedded decorative joint member 70, so that cracks are induced at desired locations even when the concrete covering portion is thick. can do. The distance between the outer induced joint member 50 and the embedded decorative joint material 70 can be arbitrarily set according to the shapes and inclination angles of the first plate portion 32 and the second plate portion 33 .

(Method of fixing the outer induced joint member according to the first example)
Next, a method for fixing the outer induced joint member 50 according to the first example to the bar arrangement 103 using the fixture 1 according to the first example configured as described above will be described. First, after placing the bottom slab concrete, the main reinforcing bars 102 and the bar arrangement 103 are arranged, and then the inner induced joint member 60 is fixed to the bar arrangement 103 . After that, the reinforcing bar attachment portion 2 of the fixture 1 is attached to the bar arrangement 103 . At this time, the reinforcing bar arrangement 103 is clamped by the first clamping part 21 and the second clamping part 22 by simply pushing the reinforcing bar arrangement 103 between the first clamping part 21 and the second clamping part 22 of the reinforcing bar mounting part 2. so no tools are required. Then, the positioning portion 21 c of the reinforcing bar attachment portion 2 is brought into contact with the side surface of the inner trigger joint member 60 . The operation of bringing the positioning portion 21c into contact with the side surface of the inner trigger joint member 60 may be performed at the same time as pushing the reinforcement arrangement 103 between the first clamping portion 21 and the second clamping portion 22, or the first clamping may be performed. It may be after the bar arrangement 103 is pushed between the portion 21 and the second holding portion 22 . A plurality of fixtures 1 are attached to each bar arrangement 103 in this way.

Next, the outer induced joint member 50 is attached to the induced joint member attachment portion 3 . At this time, as shown in FIG. 9, one end in the width direction of the outer triggering joint member 50 is hooked to the first engaging portion 34 of the triggering joint member mounting portion 3 and engaged, while the width direction of the outer triggering joint member 50 is engaged. The other end portion is arranged in front of the second engaging portion 35 so as not to be engaged with the second engaging portion 35 . From this state, when the other end in the width direction of the outer trigger joint member 50 is brought into contact with the second engaging portion 35 and the second engaging portion 35 is pushed in a direction approaching the bar arrangement 103, the second plate portion 33 is arranged. It bends and deforms in a direction approaching the muscle 103 . Since the second plate portion 33 is inclined, when the second plate portion 33 is flexurally deformed in a direction approaching the bar arrangement 103, the second engaging portion 35 at the tip thereof is displaced away from the first engaging portion 34. As shown in FIG. When the second engaging portion 35 moves away from the first engaging portion 34 , the other widthwise end portion of the outer induced joint member 50 climbs over the second engaging portion 35 and engages with the second engaging portion 35 . Move to possible position. At this time, since the dimension H2 of the second engaging portion 35 is shorter than the dimension H1 of the first engaging portion 34, the other widthwise end portion of the outer induced joint member 50 can be moved without significantly deforming the second plate portion 33. can be engaged with the second engaging portion 35 .

After that, when the force pushing the outer trigger joint member 50 is released, the second plate portion 33 is restored and the separation distance between the first engaging portion 34 and the second engaging portion 35 becomes the designed distance. One widthwise end and the other end of the outer induced joint member 50 are engaged with the first engaging portion 34 and the second engaging portion 35 . As a result, the outer triggering joint member 50 does not separate from the triggering joint member mounting portion 3, and the displacement in the width direction is restrained by the first engaging portion 34 and the second engaging portion 35, so that the flow pressure of the concrete is reduced. It is possible to suppress the displacement of the outer induced joint member 50 when it acts.

In addition, by simply pushing the other widthwise end portion of the outer induced joint member 50 toward the bar arrangement 103 in a state where one widthwise end portion of the outer induced joint member 50 is engaged with the first engaging portion 34, the second plate The elastic deformation of the portion 33 can be used to engage the other widthwise end portion of the outer induced joint member 50 with the second engaging portion 35 . Therefore, when fixing the outer induced joint member 50, various tools are not required, and a simple operation is sufficient. When engaging the other end in the width direction of the outer induced joint member 50 with the second engaging portion 35 , the first plate portion 34 may be flexurally deformed in a direction approaching the bar arrangement 103 . Also, the other widthwise end of the outer triggering joint member 50 is first engaged with the second engaging portion 35 , and then the one widthwise end of the outer triggering joint member 50 is engaged with the first engaging portion 34 . You may do so.

After securing the outer trigger joint members 50, the concrete formwork panels are installed. After the concrete formwork panels are installed, the concrete is poured. When the concrete hardens, a wall-like structure 100 having a cross-sectional defect inside is obtained.

(Fixture for induced joint member according to second example)
Next, the structure of the induced joint member fixture 1A for fixing the outer induced joint member 50 according to the first example shown in FIGS. 4 and 5 to the bar arrangement 103 will be described. The fixture 1A includes a reinforcing bar mounting portion 200 and an induced joint member mounting portion 300 to which the outer induced joint member 80 according to the second example is mounted, and the induced joint member mounting portion 300 is fixed to the reinforcing bar mounting portion 200. ing. The reinforcing bar mounting portion 200 has the same structure as the reinforcing bar mounting portion 2 of the fixture 1 according to the first example, and includes a first holding portion 221 and a second holding portion (not shown). The portion 221 is provided with a plurality of openings 221a, a first claw portion 221b, and a positioning portion 221c. Similarly, although not shown, the second clamping portion is also provided with a plurality of openings, a second claw portion, and a positioning portion.

The induced joint member attachment portion 300 is composed of a metal plate member 330 similar to the plate member 30 of the first example. The plate member 330 is formed flat from a portion corresponding to one end in the width direction of the induced joint member 80 to a portion corresponding to the other end, and is positioned on a vertical plane parallel to the axis of the bar arrangement 103. ing. A flat plate portion 331 to which the fixing portion 220 of the reinforcing bar attachment portion 2 is fixed is provided at the intermediate portion in the width direction of the plate member 330 as in the first example. As in the case of the first example, the flat plate portion 331 is shifted from the widthwise central portion of the plate portion 330 to one side in the widthwise direction by a predetermined amount instead of the widthwise central portion.

The plate member 330 has a flat plate portion 331 , a first engaging portion 334 and a second engaging portion 335 . The first engaging portion 334 is provided at one end in the width direction of the plate member 330 and is a portion that engages with one end in the width direction of the outer induced joint member 80 . The first engaging portion 334 is formed by bending a portion of the plate member 330 corresponding to one end portion in the width direction of the outer trigger joint member 80 toward the other end portion. It is possible to engage by hooking one end. The second engaging portion 335 is formed by bending a portion of the plate member 330 corresponding to the other end in the width direction of the outer trigger joint member 80 toward the other end. The other end in the width direction can be engaged by hooking. As shown in FIG. 10, the width dimension (H1) of the first engaging portion 334 and the width dimension (H2) of the second engaging portion 35 are set to be the same. good.

(Method of fixing the outer induced joint member according to the second example)
Next, a method of fixing the outer induced joint member 80 according to the second example to the bar arrangement 103 using the fixture 1A according to the second example configured as described above will be described. First, the inner induced joint member 60 is fixed to the bar arrangement 103, and then the reinforcing bar attachment portion 200 of the fixture 1A is attached to the bar arrangement 103. Then, the positioning portion 221 c of the reinforcing bar attachment portion 200 is brought into contact with the side surface of the inner trigger joint member 60 . The process up to this point is the same as the first example.

Next, the outer trigger joint member 80 is attached to the trigger joint member attachment portion 300 . At this time, the protruding portions 81a of the outer induced joint member 80 having the shape shown in FIG. elastically deform. Specifically, the distance between the widthwise one end and the other end of the outer triggering joint member 80 is shorter than the distance between the first engaging portion 334 and the second engaging portion 335. 80 is elastically deformed, and in this state, the extending portions 81b, 81b of the outer induced joint member 80 are brought into contact with the plate member 330. As shown in FIG. After that, when the force is removed, the shape of the outer induced joint member 80 is restored, and one widthwise end and the other end of the outer induced joint member 80 are engaged with the first engaging portion 334 and the second engaging portion 335. do. Therefore, no tool is required for fixing the outer induced joint member 80 to the bar arrangement 103, and the work is simple.

Also, one end in the width direction of the outer triggering joint member 80 is first hooked on the first engaging portion 334 to be engaged, and then the outer triggering joint member 80 is elastically deformed to reduce the width, The other end in the width direction of the outer triggering joint member 80 may be hooked on the second engaging portion 335 .

(Action and effect of the embodiment)
As described above, according to this embodiment, the reinforcement 103 is sandwiched between the first clamping portion 21 and the second clamping portion 22 of the reinforcing bar mounting portion 2 of the fixture 1, so that the reinforcing bar mounting portion 2 is arranged. 103 can be attached. Then, one end and the other end in the width direction of the outer induced joint member 50 are attached to the first engaging portion 34 and the second engaging portion 35 of the induced joint member mounting portion 3 fixed to the reinforcing bar mounting portion 2, respectively. By engaging, the outer triggering joint member 50 can be attached to the triggering joint member mounting portion 3 . Therefore, when the outer induced joint member 50 is attached to the bar arrangement 103, binding wires, bolts, and nuts are not required, so hackers and ratchets are not required, and the outer induced joint member 50 can be easily and reliably attached. , and can be fixed in a short time.

Further, when engaging the inner triggering joint member 50 according to the first example with the first engaging portion 34 and the second engaging portion 35 of the triggering joint member mounting portion 3, the inner triggering joint member 50 is engaged with one of the engaging portions. By pushing the other engaging portion while hooked on the joining portion, the elastic deformation of the induced joint member mounting portion 3 can be used for easy engagement.

Further, when engaging the inner triggering joint member 80 according to the second example with the first engaging portion 334 and the second engaging portion 335 of the triggering joint member mounting portion 300, the width of the inner triggering joint member 80 is narrow. After elastically deforming the inner triggering joint member 80 and arranging it between the first engaging portion 334 and the second engaging portion 335, the shape of the inner triggering joint member 80 can be easily restored. can be engaged.

The above-described embodiments are merely examples in all respects and should not be construed in a restrictive manner. Furthermore, all modifications and changes within the equivalent range of claims are within the scope of the present invention.

INDUSTRIAL APPLICABILITY As described above, the fastener for the induced joint member according to the present invention can be used for fixing the cross-section-defective member arranged in a concrete structure.

1, 1A Fixture 2 Reinforcing bar attachment portion 3 Induced joint member attachment portion 21 First clamping portion 22 Second clamping portion 30 Plate material 32 First plate portion 33 Second plate portion 34 First engaging portion 35 Second engaging portion 50 Outer induced joint member 60 Inner induced joint member 80 Outer induced joint member 100 Wall-like structure 103 Bar arrangement (rebar)

Claims (6)

Fixing of an induced joint member for fixing a vertically long induced joint member arranged inside a concrete wall-shaped structure to a reinforcing bar arranged inside the wall-shaped structure and extending in the horizontal direction In the tool
a reinforcing bar mounting portion having a first holding portion and a second holding portion for holding the reinforcing bar in the vertical direction by contacting the outer peripheral surface of the reinforcing bar, respectively, and made of an elastic metal material;
a induced joint member mounting portion having a first engaging portion and a second engaging portion that engage with one end and the other end in the width direction of the induced joint member, respectively;
The reinforcing bar mounting portion has a fixing portion fixed to the induced joint member mounting portion,
The first clamping portion protrudes from the upper portion of the fixing portion and is formed so as to abut against an upper portion of the outer peripheral surface of the reinforcing bar from above. It is curved so as to be positioned downward as it approaches the proximal end in the projection direction from the intermediate portion and as it approaches the distal end in the projection direction from the intermediate portion in the projection direction,
The first holding portion is provided with an opening extending from the projecting direction base end side to the projecting direction distal end side, and the peripheral edge portion located on the projecting direction distal end side of the opening is the projecting part. A first claw portion protruding toward the direction base end portion and engaging with the outer peripheral surface of the reinforcing bar is formed,
The second clamping part protrudes from the lower part of the fixing part, is formed to abut against a lower part of the outer peripheral surface of the reinforcing bar from below, and has a middle part in the direction of protrusion positioned at the lowest position and protrudes. It is curved so as to be located higher as it approaches the projecting direction base end from the direction intermediate part and as it approaches the projecting direction tip part from the projecting direction intermediate part,
The second holding portion is provided with an opening extending from the protruding direction base end side to the protruding direction leading end side, and the peripheral edge portion located on the protruding direction leading end side of the opening is the protruding part. a second claw portion protruding toward the direction base end portion and engaging with a portion below the portion of the outer peripheral surface of the reinforcing bar where the first claw portion is engaged;
A induced joint member characterized in that a vertical separation dimension between a projecting direction intermediate portion of the first holding portion and a projecting direction intermediate portion of the second holding portion is set shorter than an outer diameter size of the reinforcing bar. fixture. In the fixture of the induced joint member according to claim 1,
The induced joint member mounting portion is made of a plate member extending from one end in the width direction of the induced joint member to the other end,
The first engaging portion is configured by bending a portion of the plate material corresponding to one end in the width direction of the induced joint member toward the other end,
The second engaging portion is formed by bending a portion of the plate member corresponding to the other end in the width direction of the induced joint member toward the one end side. equipment. In the fixture of the induced joint member according to claim 2,
The fixed portion of the reinforcing bar mounting portion is fixed to a portion of the plate material corresponding to the width direction intermediate portion of the induced joint member,
The plate member includes a first plate portion formed so as to separate from the reinforcing bar as it approaches the first engaging portion from a portion where the fixing portion is fixed, and a portion where the fixing portion is fixed to the second engaging portion. and a second plate portion formed so as to move away from the reinforcing bar as it approaches the joining portion. In the fixture of the induced joint member according to claim 3,
A fixture for a induced joint member, wherein the plate material has elasticity. In the fixture of the induced joint member according to claim 4,
A fixture for an induced joint member, wherein the plate material is formed flat from a portion corresponding to one end in the width direction of the induced joint member to a portion corresponding to the other end in the width direction of the induced joint member. In the fixture of the induced joint member according to any one of claims 1 to 5,
The induced joint member attachment portion is a portion to which an outer induced joint member disposed outside the reinforcing bars inside the wall-like structure is attached,
The reinforcing bar mounting portion abuts on a plate-shaped inner induced joint member that is disposed inside the wall-like structure inside the reinforcing bar and extends in the thickness direction and the vertical direction of the wall-like structure. A fixture for an induced joint member, characterized by having a positioning portion for positioning the outer induced joint member so that the widthwise central portion of the outer induced joint member is positioned on an extension line of the induced joint member. .

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