JP2006348746A - Hook anchor, and concrete slab construction method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate adjustment of the length of a hook bolt corresponding to the interval between the top end bar and the bottom form, by adjusting the upward protrusion amount of the hook bolt. <P>SOLUTION: The hook anchor comprises the hook bolt 21 with its upper part being bent into a hook shape so as to be hung on a top end bars 4x, 4y and with its lower part formed of a screw groove, a turn-buckle 22 adjustably connecting to the hook bolt to allow the upward protrusion amount of the hook bolt 21, an anchor member 23 connected to the penetration hole 22b of the turn-buckle 22, having a wedge piece 23b formed gradually expanding upward from the upper surface of a cylindrical part 23a and inserted into the fitting hole 2a of the form plate 2, and the anchor bolt 24 inserted through the lower part of the cylindrical part 23a of the anchor member 23 and engaged with a fixing unit 27 provided at a part protruding from the top end of the anchor member 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention, when constructing a concrete slab using an embedded body in parallel with a form plate, prevents the upper end bar from moving upward, and regulates the cover size of the concrete above the upper end bar. The present invention relates to an anchor and a concrete slab construction method using the anchor.

2. Description of the Related Art Conventionally, a concrete hollow slab method in which an embedded body made of a lightweight material is embedded in concrete is known. This is a construction method in which an embedded body made of a lightweight material is placed between the upper and lower reinforcing bars arranged vertically and horizontally on the upper surface of the form plate corresponding to the bottom plate of the concrete slab, and concrete is placed there. . As a result, a hollow portion is formed in the concrete in the portion where the embedded body is embedded, and it is possible to reduce the weight of the concrete slab and improve sound insulation and the like. Such a technique is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-151620.
JP 11-10743 A

  However, in the simple construction method of the void slab using the floating metal fitting described in Patent Document 1, when the formwork plate is peeled off from the lower surface of the concrete slab, the tip of the floating metal fitting (fixing metal fixing bolt) is placed on the bottom surface of the concrete slab. Had the problem of remaining.

  The present invention has been developed to solve such problems. That is, an object of the present invention is to provide a hook anchor whose length can be easily adjusted according to the distance between the upper end bar and the lower mold frame by adjusting the upward protrusion amount of the hook bolt. It is to provide. Moreover, it is providing the concrete slab construction method which can peel a formwork board, without the front-end | tip part of a hook anchor remaining on the bottom face of concrete slab.

According to the hook anchor of the present invention, when the concrete slab is constructed using the embedded body (10) arranged in parallel with the mold plate (2), the upper end bars (4x, 4y) are prevented from moving upward. A concrete slab hook anchor (20) for regulating the covering dimension of the concrete (C) above the upper end bars (4x, 4y), the upper part being hooked to the upper end bars (4x, 4y) A hook bolt (21) which is bent into a shape and has a screw groove formed at the bottom;
The hook bolt (21) is connected to a turnbuckle (22) in which the upward protrusion amount is adjustable, and a through hole (22b) of the turnbuckle (22), and the upper surface of the cylindrical portion (23a). An anchor member (23) inserted into the mounting hole (2a) of the mold plate (2), wherein a wedge piece (23b) is formed so as to gradually expand upward from the cylinder, and a cylindrical portion of the anchor member (23) A concrete bolt characterized by comprising: an anchor bolt (24) inserted from below (23a) and screwed into a fixing nut (27) provided at a portion protruding from the upper end of the anchor member (23). A slab hook anchor is provided.
For example, the turnbuckle (22) has a through hole (22a) through which a lower portion of the hook bolt (21) passes, and an upper nut (25) is non-rotatably attached to the lower side of the through hole (22a), A through hole (22b) is provided in the lower part of the upper nut (25).

For example, the anchor member (23) is formed of a flexible synthetic resin material so that the wedge piece (23b) of the cylindrical portion (23a) is easily expanded.
It is preferable to form two wedge pieces (23b) in the cylindrical portion (23a) of the anchor member (23).

  According to the construction method of the present invention, the formwork plate (2) corresponding to the bottom plate of the concrete slab is laid, and the lower end bars (3x, 3y) are arranged vertically and horizontally, and the lower end bars (3x, 3y) are substantially arranged. The upper end bars (4x, 4y) are arranged so as to be positioned above, and then the hook bolt (21) formed in a hook shape at the upper part, and the anchor member (23) connected to the lower part in a detachable manner, A hook anchor (20) comprising the anchor member (23) is inserted into the mounting hole (2a) of the mold plate (2), and the upper end bars (4x, 4y) positioning is performed, and after the concrete (C) placed on the mold plate (2) is solidified, the anchor member (23) of the hook anchor (20) is cut off, whereby the mold plate ( 2) Remove from the bottom of the concrete slab Concrete slab construction method using the hook anchor, characterized in that there is provided.

At the same time as inserting the anchor member (23) of the hook anchor (20) into the mounting hole (2a) of the mold plate (2), the hook-like upper end of the hook bolt (21) is connected to one upper end line (4x , 4y).
It is preferable to hook the hook-shaped upper end of the hook bolt (21) of the hook anchor (20) to such an extent that the hook upper end (4x, 4y) is lightly touched.
It is preferable that the hook-shaped upper end portion of the hook bolt (21) of the hook anchor (20) is applied to the upper end line (4x, 4y) in a slightly spaced state.

  As described above, the hook anchor (20) of the present invention comprises the hook bolt (21), the turnbuckle (22), the anchor member (23) and the anchor bolt (24). The length of the hook anchor (20) can be easily adjusted by screwing or unscrewing the turnbuckle (22). The hook anchor (20) whose length has been adjusted in advance in this way is attached to the mold plate 2. Therefore, the length of the hook anchor (20) can be finely adjusted according to the height of the upper end bars (4x, 4y) arranged on the mold plate (2).

  In the construction method of the present invention, after the concrete (C) is solidified, only the anchor member (23) of the hook anchor (20) is cut off so that the form plate (2) can be easily peeled off from the lower surface of the concrete slab. it can. There is no problem that the tip of the hook anchor (20) remains on the bottom surface of the concrete slab as in the prior art.

  The present invention, when constructing a concrete slab using an embedded body in parallel with a form plate, prevents the upper end bar from moving upward and regulates the concrete cover size of the portion above the upper end bar. It is an anchor. It is a concrete slab construction method using this hook anchor.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an enlarged side view showing a hook anchor of the first embodiment.
The hook anchor 20 according to the first embodiment of the present invention is used when a concrete slab is constructed using a plurality of lightweight embedded bodies 10 made of a lightweight material embedded in concrete (see FIGS. 5 to 8). The hook anchor 20 prevents the upper end bars 4x and 4y from moving upward, and regulates the cover size of the concrete C in the upper part of the upper end bars 4x and 4y. The hook anchor 20 includes a hook bolt 21, a turn buckle 22, an anchor member 23, and an anchor bolt 24.

  The upper end of the hook bolt 21 is bent into a hook shape, and a screw groove is formed at the lower end. The upper end portion that is bent into the hook shape is a portion that is applied to the upper end stripes 4x and 4y.

  The turnbuckle 22 has a through hole 22a formed at the upper center thereof, and an upper nut 25 is non-rotatably attached to the lower side of the through hole 22a. The upper nut 25 is detachable from the side of the turnbuckle 22 and cannot rotate with respect to the turnbuckle 22 in the inserted state.

  Also, a through hole 22b is formed in the lower end portion of the turnbuckle 22 similarly to the upper end portion, and a lower nut 26 is non-rotatably attached to the upper side of the through hole 22b. The lower nut 26 is also detachable from the side of the turnbuckle 22 in the same manner as the upper nut 25, and cannot rotate with respect to the turnbuckle 22 in the inserted state.

  The anchor member 23 is formed of a synthetic resin material having flexibility by integral molding. A cylindrical portion 23a at the lower end and two wedge pieces 23b are formed so as to gradually expand upward from the upper surface of the cylindrical portion 23a. Has been.

  The turnbuckle 22 configured in this manner is provided with a space 22c in a portion below the upper nut 25. The hook bolt 21 is passed through the through hole 22a of the turnbuckle 22 from above and is screwed into the upper nut 25. When they are combined, the screwing amount of the hook bolt 21 can be adjusted. That is, the amount of upward protrusion of the hook bolt 21 from the turnbuckle 22 can be adjusted by screwing or unscrewing the hook bolt 21 of the hook anchor 20 with respect to the turnbuckle 22.

  The anchor bolt 24 is for attaching the anchor member 23 to the turnbuckle 22. The anchor bolt 24 is first inserted from below the anchor member 23, and a fixing nut 27 of the anchor member 23 is screwed into a portion protruding from the upper end of the anchor member 23. Thereby, the anchor member 23 is attached to the anchor bolt 24. Further, the upper end portion of the anchor bolt 24 protruding upward from the fixing nut 27 is inserted into the lower through hole 22 b of the turnbuckle 22 and screwed into the lower nut 26. No space is formed above the lower nut 26, and thus the anchor member 23 can be attached to the lower portion of the turnbuckle 22 by screwing the anchor bolt 24 into the lower nut 26.

FIG. 2 is a side cross-sectional view showing a state in which the upper and lower reinforcing bars are arranged in the concrete slab construction method of the second embodiment. FIG. 3 is a side sectional view showing a state in which a hook anchor is attached in the concrete slab construction method of the second embodiment.
About the concrete slab construction method of Example 2, the case where a concrete slab is constructed | assembled using the several lightweight embedded body 10 and the hook anchor 20 which were arranged in series by the support bar 17 is demonstrated.
First, the formwork plate 2 corresponding to the bottom plate of the concrete slab is spread, and the lower end bars 3x and 3y are arranged vertically and horizontally. The lower end bars 3x and 3y arranged vertically and horizontally are the lower end bars arranged to extend in one direction as "one lower end line 3x", and the lower end bars arranged so as to extend in the direction orthogonal thereto are The lower end bar 3y ”is set, and the lower end bar 3x is positioned below the other lower end bar 3y. In this case, a spacer (not shown) for the lower end stripe is used to separate the lower end stripe 3x from the form plate 2 as appropriate.

  The height of the spacer for the lower end bars determines the thickness (cover) of the concrete C in the portion below the one lower end bar 3x among the thickness of the concrete slab, and is usually set to 30 to 40 mm. . For example, when the thickness of the concrete slab is 275 mm, the upper reinforcing bars 4x, 4y and the lower reinforcing bars 3x, 3y are rebars with a diameter of 13 mm and are arranged with a bar arrangement pitch of 200 mm (± 1 mm). “± 1 mm” indicates an allowable error. Moreover, in this Example 1, the thickness (cover) of the concrete C above the upper end reinforcement 4x and the thickness (cover) of the concrete C below the one (lower) lower end reinforcement 3x are set. Each is 30 mm.

  Next, in order to arrange the upper end bars 4x and 4y, upper end bar spacers (not shown) are arranged. The upper stripe spacers are used to place the upper stripes 4x and 4y in the temporary positions. The upper end bars 4x and 4y are arranged so as to be positioned substantially above the lower end bars 3x and 3y. The upper end bars 4x and 4y arranged vertically and horizontally are the upper end bars arranged so as to extend in one direction as "one upper end line 4x", and the upper end bars arranged so as to extend in the direction orthogonal thereto are expressed as "the other upper end bars". The upper end bar 4y ”is placed on the upper side of the other upper end bar 4y. Then, when the upper bar 4y is placed on each upper bar spacer, the lower bar 3x, 3y and the upper bar 4x, 4y are arranged at predetermined positions in the planned space of the concrete slab.

  In addition, although illustration was abbreviate | omitted, the lower end reinforcement 3x, 3y and the upper end reinforcement 4x, 4y arranged vertically and horizontally are united in each intersection. Accordingly, the lower end bars 3x and 3y or the upper end bars 4x and 4y arranged in the vertical and horizontal directions are arranged in a state where no positional deviation occurs.

FIG. 4 is a side sectional view showing a state in which the above-described hook anchor is attached in the concrete slab construction method of Example 2, and (a) is a state in which the hook anchor is attached toward the attachment hole formed in the mold plate. b) is a state where the entire anchor member is inserted into the mounting hole, and (c) is a state where the anchor member is passed through the mounting hole and the wedge piece is hooked on the mounting hole.
The hook anchor 20 is attached to the mold plate 2 in order to position the upper end bars 4x and 4y. First, an attachment hole 2a for attaching the hook anchor 20 is formed in the mold plate 2 (see FIG. 4A). The mounting hole 2a is formed in the mold plate 2 in the vicinity of the intersection of the lower end line 3x and the lower end line 3y (see FIGS. 3 and 4A). The mounting hole 2a is formed slightly larger than the diameter of the cylindrical portion 23a of the anchor member 23 of the hook anchor 20 (see FIG. 4A).

  The anchor member 23 of the hook anchor 20 is inserted into the mounting hole 2a formed in this way. At this time, when the anchor member 23 is pushed into the mounting hole 2a from above, the two wedge pieces 23b bend inward and the entire anchor member 23 is inserted through the mounting hole 2a (see FIG. 4B). Then, when the anchor member 23 has penetrated the mounting hole 2a, the wedge piece 23b returns to the outside again and is caught by the peripheral edge of the mounting hole 2a (see FIGS. 3 and 4C). In this state, the anchor bolt 24 is positioned in the mounting hole 2a, and the hook anchor 20 is slightly movable in the plane direction. Even if the hook anchor 20 moves slightly in the plane direction, either or both of the wedge pieces 23b are caught by the peripheral edge of the mounting hole 2a of the mold plate 2, and the hook anchor 20 extends from the mounting hole 2a of the mold plate 2. It will not come out (see FIGS. 3 and 4C).

  When the anchor member 23 of the hook anchor 20 is inserted through the mounting hole 2 of the mold plate 2, the hook-shaped upper end portion of the hook bolt 21 is placed on one upper end line 4x. The hook upper end portion 4x is not caught so as to press the upper end stripe 4x, but may be lightly touched or slightly separated (see FIGS. 3 and 4C). As will be described later, when placing the concrete C, the upper end muscle 4x tries to rise due to the buoyancy of the lightweight implant 10, and the upper end muscle 4x is the uppermost hook-like portion of the hook bolt 21 of the hook anchor 20. This is because the position in the vertical direction is regulated. As a result, the vertical position of the upper end reinforcement 4x is accurately determined from the lower surface of the concrete slab (formwork plate 2), and the thickness of the planned concrete slab is improved with accuracy. The thickness of the concrete C on the upper side from 4x, that is, the cover size is also determined with high accuracy.

FIG. 5 is a side sectional view showing a state immediately before arranging a plurality of lightweight embedded bodies in the concrete slab planned space. FIG. 6 is a side sectional view showing a state in which a plurality of lightweight embedded bodies are arranged in a concrete slab planned space.
First, the connection body of the lightweight implant 10 supported by the support muscles 17 is arranged at a predetermined position. After the support bars 17 are positioned so as to be parallel to these upper upper bars 4x and 4y between the upper upper bars 4x of the upper and lower bars 4x and 4y arranged vertically and horizontally (see FIG. 5), the whole The lightweight implant 10 is inserted into the lattice pattern of the upper end bars 4x and 4y arranged vertically and horizontally. The supporting muscles 17 are placed so as to span the lower upper muscles 4y of the upper muscles 4x and 4y, and each lightweight implant 10 is placed at a predetermined position in the lattice shape of the upper muscles 4x and 4y. Is arranged (see FIG. 6). 5 to 8, the direction extending in the left-right direction of the drawing in FIG. 5 is the same as the direction in which one (upper) upper end streak 4x extends, and FIG. 2, FIG. 3 and FIG. The viewing direction is shown to be 90 degrees different.

  Next, the support bar 17 placed on the other upper end line 4y is bound to the other upper end line 4y at an appropriate position. In this way, the lightweight implants 10 are individually arranged in the lattice-like space of the upper end bars 4x and 4y arranged vertically and horizontally.

FIG. 7 is a side sectional view showing a state in which concrete is placed.
Next, when the concrete C is placed, the lightweight implant 10 tries to lift up due to buoyancy and raises the upper end bars 4x and 4y. As described above, the upper end bars 4x and 4y are hook anchors. The hook-like top of the 20 hook bolts 21 is caught and its movement is blocked, and the upper end bars 4x and 4y and the lightweight implant 10 are positioned in the vertical direction.

  When the placement of the concrete C is completed, the positional relationship in the vertical direction between the bottom bars 3x and 3y and the top bars 4x and 4y in the concrete slab is regulated with reference to the mold plate 2, so that the accuracy is high. Determined. That is, since one (lower) lower end bar 3x is placed on a lower end bar spacer (not shown) placed on the mold plate 2, the lower side cover dimension is determined by the dimensional accuracy of the lower end bar spacer. It is determined. Further, since the upper upper end stripe 4x is positioned by the hook anchor 20 and the hook anchor 20 is attached to the mold plate 2, the upper cover size is determined by the length of the hook anchor 20. become. As described above, the length of the hook anchor 20 can be easily adjusted by screwing or unscrewing the hook bolt 21 with respect to the turnbuckle 22. Therefore, after the length is adjusted in advance, the mold plate 2 Attach to.

FIG. 8 is a side sectional view showing a state in which the anchor bolt, the anchor member and the fixing nut are removed from the hook anchor in order to remove the formwork plate.
Finally, the mold plate 2 is removed (demolded frame). The mold plate 2 is removed by removing the anchor bolt 24 and the anchor member 23 of the hook anchor 20. Specifically, the anchor bolt 24 of the hook anchor 20 is loosened and removed from the turnbuckle 22. As a result, the anchor bolt 24, the anchor member 23, and the fixing nut 27 of the hook anchor 20 are detached from the mold plate 2. Further, the mold plate 2 from which the anchor bolt 24, the anchor member 23, and the fixing nut 27 are removed can be easily peeled off from the lower surface of the concrete slab, and the demolding is completed.

In addition, this invention is not limited to embodiment of the invention mentioned above, By adjusting the protrusion amount to the upper direction of the hook volt | bolt 21, according to the space | interval of upper end reinforcement 4x, 4y and the lower mold frame 2, As long as the length can be easily adjusted, it is not limited to the configuration shown in the figure, and various changes can be made without departing from the scope of the present invention.
Further, the method is not limited to the illustrated method as long as the mold plate 2 can be peeled off without the tip of the hook anchor 20 remaining on the bottom surface of the concrete slab, and the scope of the present invention is not deviated. Of course, various changes can be made.

  The hook anchor according to the present invention and the concrete slab construction method using the hook anchor prevent the upper end bar from moving upward, and prevent the upper end bar from being lifted in order to restrict the concrete cover size in the upper part of the upper end bar. Not only can it be used in various applications that prevent the lower end muscle from sinking.

It is an enlarged side view which shows the hook anchor of Example 1 of this invention. It is a sectional side view which shows the state which arranged the upper end reinforcement and the lower end reinforcement in the concrete slab construction method of Example 2. FIG. It is a sectional side view which shows the state which attached the hook anchor in the concrete slab construction method of Example 2. FIG. In the concrete slab construction method of Example 2, it is a sectional side view which shows the state which attaches a hook anchor, (a) is the state which attaches a hook anchor toward the attachment hole formed in the formwork board, (b) is an anchor member. (C) is a state in which the anchor member is passed through the mounting hole, and the wedge piece is hooked on the mounting hole. It is a sectional side view which shows the state immediately before arrange | positioning a some lightweight embedded body in concrete slab plan space. It is a sectional side view which shows the state which has arrange | positioned several lightweight embedding bodies in concrete slab plan space. It is a sectional side view which shows the state which has poured concrete. It is a sectional side view which shows the state which removes an anchor bolt, an anchor member, and a fixing nut from a hook anchor in order to remove a formwork board.

Explanation of symbols

2 Formwork plate 2a Formwork plate mounting hole 3x Bottom line (lower side)
3y Bottom muscle (upper side)
4x upper muscle (upper)
4y upper muscle (lower side)
10 Implant (Lightweight implant)
DESCRIPTION OF SYMBOLS 20 Hook anchor 21 Hook bolt 22 Turnbuckle 22b Through hole of turnbuckle 23 Anchor member 23a Cylindrical part 23b of anchor member Wedge piece of anchor member 24 Anchor bolt 27 Nut for fixing C Concrete

Claims (8)

When the concrete slab is constructed using the embedded body (10) arranged in parallel with the mold plate (2), the upper end bars (4x, 4y) are prevented from moving upward, and the upper end bars (4x, 4y) A concrete slab hook anchor (20) for regulating the cover size of the concrete (C) in the upper part,
A hook bolt (21) in which an upper part is bent into a hook shape and a screw groove is formed in the lower part to be applied to the upper end bars (4x, 4y);
A turnbuckle (22) in which the hook bolt (21) is connected so as to be adjustable in an upward projecting amount;
Mounting of the mold plate (2), which is connected to the through hole (22b) of the turnbuckle (22) and has a wedge piece (23b) formed so as to gradually expand upward from the upper surface of the cylindrical portion (23a) An anchor member (23) inserted through the hole (2a);
An anchor bolt (24) inserted from below the cylindrical portion (23a) of the anchor member (23) and screwed into a fixing nut (27) provided at a portion protruding from the upper end of the anchor member (23); A hook anchor for concrete slabs, characterized by comprising: The turnbuckle (22) has a through hole (22a) through which the lower part of the hook bolt (21) passes, and an upper nut (25) non-rotatably attached to the lower side of the through hole (22a). The hook anchor for concrete slabs according to claim 1, wherein a through hole (22b) is provided in a lower portion of the nut (25). 2. The concrete slab according to claim 1, wherein the anchor member (23) is formed of a flexible synthetic resin material so that the wedge piece (23b) of the cylindrical portion (23a) is easily expanded. Hook anchor. The hook anchor for concrete slabs according to claim 1 or 3, wherein two wedge pieces (23b) are formed in the cylindrical portion (23a) of the anchor member (23). The formwork plate (2), which is the bottom plate of the concrete slab, is laid down, and the lower end bars (3x, 3y) are arranged vertically and horizontally, and the upper end bars are positioned almost above the lower end bars (3x, 3y). (4x, 4y) are arranged,
Next, a hook anchor (20) comprising a hook bolt (21) having an upper portion formed in a hook shape and an anchor member (23) releasably connected to the lower portion is used as the anchor member (23). (2) is inserted through the mounting hole (2a), the upper end bars (4x, 4y) are positioned with respect to the mold plate (2),
After the concrete (C) placed on the mold plate (2) is solidified, the anchor member (23) of the hook anchor (20) is cut off, thereby removing the mold plate (2) from the bottom surface of the concrete slab. A concrete slab construction method using a hook anchor, wherein At the same time as inserting the anchor member (23) of the hook anchor (20) into the mounting hole (2a) of the mold plate (2), the hook-like upper end of the hook bolt (21) is connected to one upper end line (4x , 4y), The concrete slab construction method using the hook anchor according to claim 5. The concrete using the hook anchor according to claim 5, wherein the hook-shaped upper end of the hook bolt (21) of the hook anchor (20) is applied to such an extent that the upper end line (4x, 4y) is lightly touched. Slab construction method. The concrete using the hook anchor according to claim 5, wherein a hook-like upper end portion of the hook bolt (21) of the hook anchor (20) is applied to the upper end line (4x, 4y) in a slightly spaced state. Slab construction method.

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