JP2012067539A - Anchor unit for concrete form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor unit for a concrete form plate, which anchor unit can be utilized as means for mounting a support member supporting another member on the concrete placing space side of a concrete form plate.SOLUTION: Mounting means 13A is composed of a bolt 7 penetrating from a spacer 2A side through the spacer and an embedded body 1, a nut 8 screwed on and fitted to the bolt 7 penetrating through the embedded body 1, and an anchor 9 loosely fitted to the bolt 7 between a head 7a of the bolt 7 and the spacer 2A. The anchor 9 has, in the intermediate peripheral wall part excluding both ends of a cylindrical body, a strip-shaped plate part 11 for bending which is bent outward by compression of the cylindrical body in the axial direction and forms an overhanging collar part 13 clamping a concrete form plate 18 between the overhanging collar part 13 and the spacer 2A, and a protrusion 14 is formed on the peripheral edge on the bolt head 7a side of the anchor 9. On the bolt 7, a protrusion 16 which engages with the protrusion 14 of the anchor 9 and restricts relative rotation with respect to the anchor 9 is formed.

Description

  The present invention relates to an anchor unit which is attached to the inside of a concrete form plate and used for connecting and supporting other members to the concrete form plate, for example.

  As this type of anchor unit for concrete formwork, for example, as described in Patent Document 1, concrete inside a concrete formwork plate for constructing a floor slab of a veranda, that is, concrete of a concrete formwork plate temporarily installed horizontally It is known that a concrete form for handrails of a veranda is connected to and supported by an anchor unit via an oblique support member. In the conventional anchor unit described in Patent Document 1, a mounting screw shaft protrudes from an embedded main body to be attached to the inside of a concrete mold plate, and is provided in advance on the concrete mold plate. The screw shaft is inserted through the mounting hole, and a concrete mold fastener or the like is screwed and fastened to the screw shaft protruding to the opposite side of the concrete mold plate. It was configured to attach an embedded body.

Japanese Utility Model Publication No. 5-52107

  In the anchor unit having the conventional configuration as described above, an operation for holding the embedded main body by inserting a screw shaft into the mounting hole of the concrete mold plate, which is performed on one side of the concrete mold frame to which the embedded main body is attached. And the other side of the concrete form plate, the work to fasten concrete form fasteners and the like to the screw shaft is necessary. There is a problem in that it requires a worker to perform the operation and increases the cost.

  The present invention proposes an anchor unit for concrete formwork that can solve the conventional problems as described above, and the anchor unit for concrete formwork according to the present invention according to claim 1, In order to facilitate understanding of the relationship with the examples described later, the reference numerals used in the description of the examples are shown in parentheses, and the embedded body (1), the embedded body (1) and the concrete mold Consists of spacers (2A, 2B) that secure a space between the frame plate (18) and mounting means (13A, 13B) .The mounting means (13A, 13B) is on the spacer (2A, 2B) side. A bolt (7) that passes through the spacer (2A, 2B) and the embedded body (1), a nut (8) that is screwed into the bolt (7) that passes through the embedded body (1), and the bolt (7). Anchors loosely fitted to the bolts (7) between the head (7a) and the spacers (2A, 2B) ( 9), this anchor (9) is bent outward by compression in the axial direction of the cylindrical body on the intermediate peripheral wall portion excluding both ends of the cylindrical body, and the spacer (2A, 2B) A bending belt-like plate portion (11) that forms an overhanging flange portion (13) that sandwiches the concrete mold plate (18) between the heads (7a) of the bolt (7) of the anchor (9) A protrusion (14) is formed on the peripheral edge of the side, and the bolt (7) engages with the protrusion (14) of the anchor (9) to restrict relative rotation with the anchor (9). The projecting portion (16) is formed.

  According to the configuration of the present invention, the concrete mold plate embedded body may be provided as long as the mounting hole through which the bolt head of the mounting means and the tubular body of the anchor can be inserted is provided in the concrete mold plate. The bolt head of the attachment means and the tubular body of the anchor are inserted into the attachment hole from the attachment side of the metal plate, the spacer is brought into contact with the concrete mold plate, and in this state, the nut on the embedded body side is rotated in the fastening direction. Then, if the bolt is operated so as to be pulled into the embedded body side, the anchor tubular body protruding from the side opposite to the side where the embedded body is located with respect to the concrete form plate, that is, the back side is the spacer and the bolt. It is compressed in the axial direction with the head, and the bending strip plate portion of the anchor bends and deforms outward to sandwich the concrete form plate with the spacer. The flange portion and is formed. Since the embedded main body is attached to a predetermined position of the concrete form plate via the spacer by the overhanging flange portion formed on the anchor, the support is performed by appropriately connecting a support member or the like to the embedded main body as usual. The member can be attached to a predetermined position of the concrete form plate.

  As described above, according to the anchor unit of the present invention, the embedded body of the anchor unit can be attached to a predetermined position of the concrete mold plate only by operation from the side on which the anchor unit is attached to the concrete mold plate. Compared with the conventional product that requires work on both sides of the concrete formwork plate, the workability is remarkably improved, and the cost of assembling the concrete formwork can be reduced. Moreover, when the cylindrical body of the anchor sandwiched between the bolt head and the spacer is compressed in the axial direction by the fastening operation of the nut, the engagement in the circumferential direction between the protrusion on the bolt side and the protrusion on the anchor side This prevents the bolt and the tubular body of the anchor from rotating relative to each other, so that there is almost no risk that the bolt will idle with respect to the anchor, and the anchor can be quickly and reliably deformed to obtain the desired mounting effect. I can do it.

  When carrying out the present invention, as described in claim 2, the projecting portions (16) of the bolt (7) are deformed by pressing and deforming both side surfaces in the diametrical direction of the bolt (7). Further, it can be constituted by a pair of blade pieces (15a, 15b) in the diameter direction parallel to the bolt axis direction. According to this configuration, the present invention can be implemented at a lower cost than the case where another component is attached to the bolt. In this case, as described in claim 3, the protrusion (14) of the anchor (9) has a pair of diametrical pair of blades (15a, 15b) of the bolt (7) having both side edges in the circumferential direction. Adjacent semicircular arcs can be formed. According to this configuration, the protrusion of the anchor is formed integrally with the anchor formed of a thin plate, rather than the case where the protrusion of the anchor is formed of a small protrusion protruding from the peripheral edge of one end of the anchor. Strength can be increased. Further, according to a fourth aspect of the present invention, the bolt (7) is formed with a breaking groove (17) at a position where it does not protrude from the spacer (2A, 2B) to the side where the anchor (9) is located. You can keep it. According to this configuration, when dismantling the concrete formwork, the bolt protruding from the surface of the constructed concrete structure is removed by removing the bolt together with the anchor without leaving a portion protruding from the surface of the concrete structure. It can be done easily.

It is a front view of an anchor unit. It is a side view of an anchor unit. It is a top view of an anchor unit. It is a vertical front view which shows the anchor unit of use condition. It is a vertical front view which shows the state after finishing work of an anchor unit same as the above. Fig. A is an exploded plan view of the attaching means, and Fig. B is an exploded side view of the attaching means. Fig. A is a front view of the anchor in the center, and Fig. B is a front view of the anchor. It is an expansion vertical side view of the principal part of FIG. It is an expansion vertical side view of the principal part of FIG.

  1-3, 1 is an embedding body, 2A and 2B are spacers, and 3A and 3B are attachment means. The embedding main body 1 in this embodiment is obtained by cutting an angle material into an appropriate length, and cuts off both end corners of the vertical plate portion 1a obliquely, and also connects the vertical plate portion 1a and the horizontal plate portion 1b. Reinforcing ribs 4 that protrude toward the corners are formed at two corners between them, and mounting holes for fastening various supporting members 5 with bolts and nuts at the center in the longitudinal direction of the vertical plate 1a 6 is provided. A reinforcing annular projecting seat 6a is formed around the mounting hole 6 so as to project to the side with the horizontal plate portion 1b.

  The spacers 2A and 2B are of a cone type formed from a synthetic resin or the like, and are conventionally well-known with concentric through holes 2a (see FIG. 8). The attachment means 3A and 3B are the same as each other, and are composed of a bolt 7, a nut 8, and an anchor 9. As shown in FIGS. 6 and 7, the anchor 9 is formed of a cylindrical body obtained by bending a thin iron plate into a cylindrical shape, and the axial direction of the anchor 9 is between the cylindrical portions 10a and 10b at both ends. Bending strip-like plate portions 11 that are bent outward by compression of the ridges to form overhanging flange portions 13 (see FIGS. 4, 5, and 9) are alternately arranged in the circumferential direction with notch groove portions 12 parallel to the axial direction. The cut is formed as follows. Each of the bending strip-shaped plate portions 11 is bent in a small mountain shape outwardly in advance and has a narrow-width constricted portion 11a that facilitates bending at an end portion adjacent to the cylindrical portion 10a and a mountain-shaped top portion. 11b are formed. Further, the length between the narrow-width constricted portions 11a and 11b of each bending belt-like plate portion 11 is slightly shorter than the length between the narrow-width constricted portion 11b and the cylindrical portion 10b at the other end.

  Further, a semicircular arc-shaped protrusion 14 is provided on the periphery of the end of the cylindrical portion 10b of the anchor 9 so as to continue in the circumferential direction in a range slightly smaller than the range of 180 degrees. The bolt 7 penetrates the anchor 9 and the spacers 2A and 2B concentrically, and is integrally formed on the inner circumferential surface of the head 7a by pressurizing and deforming both side surfaces in the diameter direction of the bolt 7. And a projecting portion 16 comprising a pair of blade pieces 15a and 15b in the diametrical direction parallel to the bolt axis direction is provided, and at a predetermined intermediate position between the head portion 7a and the tip screw shaft portion 7b, A folding groove 17 formed by an annular groove in the direction is provided.

  The bolts 7 of the attachment means 3A and 3B are attached to the inside of the cylindrical body of the anchor 9, the through holes 2a of the spacers 2A and 2B, and the attachment holes 1c provided in the horizontal plate portion 1b of the embedded body 1 (see FIG. 8). In this order, and a nut 8 is screwed into a screw shaft portion 7b of the bolt 7 protruding from the horizontal plate portion 1b of the embedded main body 1. By tightening the nut 8, the bolt head 7a and the horizontal plate of the embedded main body 1 are Anchors 9 and spacers 2A, 2B that are concentrically connected in series with the portion 1b are attached to the outside of both ends in the longitudinal direction of the horizontal plate portion 1b of the embedded body 1 at right angles. Of course, the tightening of the nut 8 at this time is stopped immediately before the anchor 9 is compressed in the axial direction. As described above, the anchor 9 and the spacers 2A and 2B attached to the outside of both ends in the longitudinal direction of the horizontal plate portion 1b of the embedded main body 1 by the attaching means 3A and 3B are connected to the cylindrical portion 10a of the anchor 9 with the spacer 2A. , 2B are concentrically adjacent to each other, the small diameter ends of the spacers 2A, 2B are in contact with the horizontal plate portion 1b of the embedded body 1, and the semicircular projection 14 of the cylindrical portion 10b of the anchor 9 is provided. The blade pieces 15a and 15b of the projecting portion 16 of the bolt 7 are in contact with both sides in the circumferential direction. In addition, the maximum diameter in the position of the mountain-shaped top part of each strip | belt-shaped board part 11 for bending of the anchor 9 is the same grade as the maximum diameter of the bolt head 7a.

  When using the anchor unit having the above structure, as shown in the phantom line of FIG. 1 and FIG. 8, the two bolts 7 attached to the embedded main body 1 are attached to the concrete form plate 18 to which the anchor unit is attached. In accordance with the position of the anchor 9, a through hole 19 having an inner diameter through which the bolt 7 and the anchor 9 can pass is provided in advance. Thus, the two bolts 7 and anchors 9 of the anchor unit are inserted into the through holes 19 from the inside of the concrete mold plate 18 (concrete casting space side), and the large-diameter ends of the spacers 2A and 2B are put into the concrete. Once the inner surface of the mold plate 18 is brought into contact, the nut 8 screwed to each bolt 7 is strongly tightened with an appropriate tool.

  As a result, the anchor 9 sandwiched between the spacers 2A, 2B and the bolt head portion 7a is compressed in the axial direction, but each bending belt-like plate portion 11 is configured as described above. The narrow-width constricted portion 11b of each bending belt-like plate portion 11 is bent outwardly in a mountain fold shape, and the boundary between the narrow-width constricting portion 11a and the cylindrical portion 10b of each bending belt-like plate portion 11 is valley-folded. The overhanging flange portion 13 is formed by each of the bending belt-like plate portions 11 that are bent outward and bent radially outward. Further, when the nut 8 is fastened and the anchor 9 is compressed in the axial direction, the bending band-like plate portion 11 of the anchor 9 finally has a portion between the narrow portion 11a and 11b and the narrow portion 11b and the cylindrical portion. Since the peripheral portion of the overhanging flange portion 13 moves closer to the outer surface of the concrete mold plate 18 so as to be bent outward by 90 degrees or more so as to enter the inside of the portion between the portion 10b, FIG. As shown in FIGS. 5 and 9, a concrete mold plate 18 is sandwiched between the peripheral portion of the overhanging flange 13 and the large diameter ends of the spacers 2A and 2B, and the embedded main body 1 of the anchor unit is fixed to the concrete mold. It can be fixed at a predetermined position inside the plate 18.

  The axial compression operation of the anchor 9 by fastening the nut 8 is based on the condition that the bolt 7 does not rotate together with the nut 8. According to the above configuration, the projecting portion 16 of the bolt 7 is configured. Since the pair of blade pieces 15a and 15b are in contact with both sides in the circumferential direction of the semicircular arc-shaped protrusion 14 on the anchor 9 side, the relative rotation between the bolt 7 and the anchor 9 is in a state of being blocked. The bolt 7 is in a non-rotating state via the anchor 9 due to frictional resistance caused by contact between the large diameter ends of the spacers 2 </ b> A and 2 </ b> B and the end surface of the cylindrical portion 10 a of the anchor 9. Therefore, the anchor 9 can be reliably compressed in the axial direction by the fastening operation of the nut 8, and the overhanging flange portion 13 can be formed by each of the bending strip-like plate portions 11.

  The subsequent operations are the same as in the prior art, and various support members 5 are connected to the mounting holes 6 of the embedded main body 1 by bolts and nuts, and the concrete form for a veranda handrail can be supported by the support members 5. . Then, concrete can be placed inside the concrete mold plate 18 (the side where the embedded main body 1 is located), and a concrete structure 20 can be built as shown in FIG. After the concrete structure 20 is built, the concrete form plate 18 is removed. At this time, the bolts 7 and anchors of the pair of attachment means 3A, 3B of the embedded body 1 embedded in the built concrete structure 20 are fixed. 9 protrudes from the surface of the concrete mold plate 18 and the breaking groove portion 17 of the bolt 7 is located in the through hole 2a of the spacers 2A and 2B, so that the concrete mold plate 18 can be removed, The bolt 7 is folded by holding the head 7a of the bolt 7 with an appropriate tool and applying a force to fold it sideways or by hitting the head 7a of the bolt 7 with a hammer or the like so as to fold it sideways. Cut at the position of the take-up groove portion 17 and, as shown in FIG. Ried mold plate 18, and spacers 2A, 2B can be removed from the concrete structure 20, which is construction of. The inner portion of the bolt 7 from the break-off groove portion 17 is in the recessed portion 21 where the spacers 2A and 2B have been removed, and is finished by filling the recessed portion 21 with mortar. I can do it.

  The structure of the embedded body 1 and the number of spacers 2A and 2B and attachment means 3A and 3B are not limited to those in the above embodiment.

  The anchor unit of the present invention can be used as means for attaching a support member for supporting another member to the concrete placement space side of the concrete form plate.

DESCRIPTION OF SYMBOLS 1 Embedded body 2A, 2B Spacer 3A, 3B Attachment means 5 Various support members 6 Attachment hole 7 Bolt 7a Bolt head 7b Bolt screw shaft part 8 Nut 9 Anchor 10a, 10b Cylindrical part 11 Bending strip | belt-shaped board part 11a, 11b Narrowly narrowed portion 12 Notched groove portion 13 Overhang flange portion 14 Semi-arc-shaped protrusion portions 15a and 15b A pair of blade pieces 16 Projection portion 17 Breaking groove portion 18 Concrete mold plate 19 Through hole 20 Concrete structure 21 Recessed recess portion

Claims (4)

  An embedded main body, a spacer that secures a space between the embedded main body and the concrete mold plate, and an attaching means, and the attaching means includes a bolt that penetrates the spacer and the embedded main body from the spacer side, and an embedded main body. It is composed of a nut that is screwed into the penetrating bolt and an anchor that is loosely fitted to the bolt between the bolt head and the spacer, and this anchor is attached to the intermediate peripheral wall portion excluding both ends of the cylindrical body. The tubular body is bent outwardly by axial compression, and includes a bending belt-like plate portion that forms an overhanging portion that sandwiches the concrete form plate with the spacer, and the bolt of the anchor A protrusion is formed on the peripheral portion on the head side, and the bolt engages with the protrusion of the anchor to restrict relative rotation with the anchor. Protrusions are formed, concrete formwork anchor unit.   The projecting portion of the bolt is configured by a pair of blade pieces in a diameter direction parallel to the bolt axial direction, which are integrally deformed by pressurizing and deforming both side surfaces in the diameter direction of the bolt. Anchor unit for concrete formwork.   3. The anchor unit for a concrete form according to claim 2, wherein the protrusion of the anchor is formed in a semicircular arc shape in which both sides in the circumferential direction are adjacent to a pair of blade pieces in the diameter direction of the bolt.   The anchor unit for a concrete form according to any one of claims 1 to 3, wherein a break-off groove is formed on the bolt at a position where the bolt does not protrude from the spacer to the side where the anchor is located.

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