JP2001311223A - Anchor for digging in concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the inside diameter of a through-hole to be bored to a form board as much as possible by using a butterfly screw having a diameter smaller than a bolt when an anchor is fixed onto the form board. SOLUTION: A tapped hole 21 having the diameter smaller than a bolt screw hole 15 for the anchor 30 made of FRPs is formed at the center of an inner bottom section, and the end section of the butterfly screw 22 inserted into the through-hole 8 of the form board 7 is screwed into the tapped hole 21. Accordingly, the inside diameter of the through-hole 8 bored to the form board 7 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor for embedding concrete.

[0002]

2. Description of the Related Art An anchor for embedding concrete is for screwing a bolt or the like to support the concrete.
It is a cylindrical body with a bottom, mainly made of metal, which is formed with projections such as ribs on the outer peripheral surface and is embedded in concrete so that it cannot rotate.

However, since metal anchors are corroded and have poor durability, the material is not corroded, and is replaced with, for example, ceramics. An anchor made of ceramics is shown in FIGS. The ceramic anchor 14 is a main body 1 made of a cylindrical body having a bottom.
And a sleeve 2 formed of a cylindrical body and screwed together with a joint 3 made of plastic to form a bolt screw hole 4 in the main body 1 in the axial direction.
A thread portion 5 having a large diameter for screwing the joint 3 is formed at the opening side end of the sleeve 2, while a thread portion 6 for screwing the joint 3 is formed on the sleeve 2.
Are formed in the axial direction.

The bolt screw hole 4 is screwed into a bolt 9 inserted through a through hole 8 formed in a form plate 7. It is a structure to do. The joint 3 has a buffering portion 10 so that the main body 1 and the sleeve 2 do not come into contact with each other, and a shaft hole 11 through which a bolt 9 is inserted is formed in the shaft center portion. On the outer peripheral surface of the main body 1, flat surface portions 12 for preventing rotation are formed to face each other at least in the diametric direction.

[0005] When ready-mixed concrete is cast on one side of the mold plate 7 on the side of the main body 1 and the sleeve 2 and it is cured and solidified to form a concrete structure, the bolt 9 is removed from the main body 1 to remove the mold. The frame plate 7 is removed. Appropriate support fittings are connected to the ceramic anchor 14 embedded in the concrete structure by bolts. Therefore, the bolt and the bolt 9 are substantially the same.

As shown in FIG. 9 (B), the sleeve 2 and the mold plate 7 are provided to prevent the fresh concrete (slag) from entering the bolt screw hole 4 and the screw portion 6 during concrete casting. May be interposed between them. The seal packing 13 is a trapezoidal ring made of plastics or rubber. The seal packing 13 is removed after the completion of the concrete structure.

Further, the applicant has developed an anchor (FRP insert) made of FRP resin. As shown in FIGS. 10 (A), (B), and (C), the FRP insert 20 has a plurality of annular projections formed on an outer peripheral surface of a bottomed cylindrical body 16 having an axial bolt screw hole 15 formed therein. 17 is formed in a ring shape at a predetermined interval in a direction intersecting with the axis, and a cutout portion 18 is formed in at least two diametrically opposed portions of the annular projection portion 17 (design registration No. 17). 9
98298).

As shown in FIG. 11, the FRP insert 20 has a bolt screwing hole 15 screwed into a bolt 9 inserted into the through hole 8 of the form plate 7 similarly to the ceramic anchor 14 and fixed. It is. Between the bottomed cylindrical body 16 and the form plate 7, a plate-shaped annular seal packing 19 is interposed as described above. After the mold is completed, the concrete packing is cast on the bottomed cylindrical body 16 side of the mold plate 7 to cure and solidify, and then the mold is removed, whereby the seal packing 19 is removed, and as shown in FIG. , Concrete structure 27
The washer 26 is inserted into the FRP insert 20 embedded in the
The support fittings 28 and 29 are attached via the bolts 9 fitted with. Other appropriate structures and the like are supported by the support fittings 28 and 29.

[0009]

However, since the ceramic anchor 14 is a pottery (porcelain), there is a disadvantage that the ceramic anchor 14 is cracked or chipped when dropped or subjected to strong vibration and impact. In addition, the ceramic anchor 14 has many parts including the main body 1, the sleeve 2, and the joint 3, and is expensive. Needless to say, the joint 3 is screwed into the main body 1 and the sleeve 2 before being attached to the form plate 7. Since everything must be assembled and assembled, there is a disadvantage that the screwing operation is large and time-consuming.

Further, the FRP insert 20 has a through hole 8 formed in the form plate 7 having a predetermined diameter for inserting a bolt 9 together with the ceramic anchor 14, and the bolt 9 is attached to a concrete structure. The through hole 8 has a required diameter whose strength is selected in consideration of other structures to be supported and the like, and has a relatively large diameter.

On the other hand, since the form plate 7 is diverted in consideration of economy in order to produce various types of concrete structures, the positions of the through holes 8 are variously changed. It is natural that the board surface becomes full of holes 8 when the 7 has been used for a long time. Therefore, after the form plate 7 is used, the work of refilling the perforated holes 8 is necessarily performed. This backfilling operation involves a welding operation. If the hole diameter is large, the backfilling welding operation also requires labor and time, and the number of such backfilling operations is extremely complicated and labor-intensive.

Further, in the shape of the FRP insert 20 itself, even if the connection with the concrete structure 26 is sufficient to prevent the plurality of annular projections 17 from coming off, it is necessary to apply a strong force to the bolt 9 to tighten it. In some cases,
Since it is assumed that the notch 18 has insufficient strength, it is desirable to further improve the detent performance.

Therefore, the present invention relates to an FRP insert 20
The diameter of the through hole 8 to be drilled in the mold plate 7 for fixing the backing is made as small as possible to facilitate the quick and easy backfilling operation and to improve the function of the FRP insert 20 itself to prevent rotation. The purpose is to:

[0014]

According to the present invention, in order to solve the above-mentioned problems, a plurality of annular projections are formed on the outer peripheral surface of a bottomed cylindrical body having an axial bolt screwing hole. Parts are formed at a predetermined interval in a direction intersecting with the axis, notches are formed in at least two places diametrically opposed to each other in the diametrical direction of the annular projection, and at the inner bottom part of the bolt screw hole. Provides an anchor for concrete embedding, wherein a screw hole having a smaller diameter is formed.

[0015] According to a second aspect of the present invention, a plurality of annular projections have a predetermined interval in a direction intersecting the axis on the outer peripheral surface of the bottomed cylindrical body having a bolt screw hole in the axial direction. And at least two diametrically opposed annular projections are integrally formed with a streak-like projection parallel to the axis, and the inner bottom of the bolt screw hole has The present invention also provides a concrete embedding anchor, wherein a small diameter screw hole is formed.

Further, as set forth in claim 3, a bolt screw hole of a bottomed cylindrical body is inserted into the end of the thumb screw inserted into the through hole formed in the form plate, and the inner bottom of the bolt screw hole is formed. It is screwed into a screw hole provided at the center, an annular seal packing is interposed between the bottomed cylindrical body and the form plate, and the bottomed cylindrical body has a plurality of annular Provided is an anchor for embedding concrete, which has a projection.

According to a fourth aspect of the present invention, a bolt screwing hole of a bottomed cylindrical body is inserted into an end of a thumb screw inserted into a through hole formed in a form plate, and an inner bottom of the bolt is formed. It is screwed into a screw hole provided at the center, an annular seal packing is interposed between the bottomed cylindrical body and the form plate, and the bottomed cylindrical body has a plurality of annular Provided is an anchor for concrete embedding, which has a streak-like projection connecting the projection and the annular projection.

According to a fifth aspect of the present invention, there is provided the concrete embedding anchor according to any one of the first to fourth aspects, wherein the bottomed cylindrical body is a molded body made of FRP resin. .

Thus, by providing a screw hole smaller in diameter than the bolt screw hole in the center of the inner bottom of the bottomed cylindrical body, a thumb screw smaller in diameter than the bolt can be screwed into the screw hole. The inside diameter of the through-hole to be formed in the mold plate can be made as small as possible, and the backfilling operation can be simplified and speeded up. In addition, since this anchor is integrally formed with a streaky projection having a larger contact area with the concrete structure than the conventional cutout, the anti-rotation strength is further improved.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the FRP insert 30 according to the first embodiment has a plurality of annular projections 17 on the outer peripheral surface of a bottomed cylindrical body 16 having an axial bolt screw hole 15 formed therein. The FRP insert has a structure in which the FRP insert is basically formed in a ring shape with a predetermined interval in the intersecting direction, and notches 18 formed in at least two positions diametrically opposed to each other in the annular projection 17. However, a screw hole 21 having a smaller diameter than the bolt screw hole 15 is provided at the center of the inner bottom portion.

The FRP insert 30 is shown in FIG.
As shown in the figure, the end of the thumbscrew 22 inserted through the through hole 8 of the formwork 7 with the seal packing 19 interposed on one side of the formwork plate 7 in the same manner as the FRP insert 20 is screwed into the screw hole 21. Is fixed. When a double nut type thumb screw is used, one can rotate the entire thumb screw 22 and the other can tighten the form plate 7. Between the bottomed cylindrical body 16 and the form plate 7, a plate-shaped annular seal packing 19 is interposed as described above. Seal packing 1
9 is removed after completion of the concrete structure. Since the thumb screw 22 has a smaller diameter than the bolt 9, the inside diameter of the through hole 8 to be drilled in the form plate 7 is substantially smaller, and the work of refilling the through hole 8 is reduced.

If the form plate 7 is not diverted or the economics of the form plate 7 are not taken into consideration, the FRP insert 30 can be bolted in the same manner as in the prior art, as shown in FIG. 9 may be screwed into the bolt screw hole 15 for use.

Next, as shown in FIGS. 4 and 5, an FRP insert 31 according to a second embodiment of the present invention is basically the same as the FRP insert 30, and has a bolt screw hole 15 in the axial direction. A plurality of annular projections 17 are formed on the outer peripheral surface of the bottomed cylindrical body 16 having a predetermined shape in a direction intersecting the axis with a predetermined interval, and are opposed to each other in the diameter direction of the annular projections 17. In at least two locations between the annular projections 17, 17, 17, integral streak projections 23, 23 are integrally formed at least diametrically opposite to each other, and a bolt screw hole is formed at the center of the inner bottom portion. This is a structure in which a screw hole 21 having a diameter smaller than 15 is provided.

The FRP insert 31 is made of the FRP
Similarly to the insert 30, the thumb screw 22 inserted into the through hole 8 of the mold frame 7 with the seal packing 19 interposed on one side of the mold plate 7
Is screwed into the screw hole 21 and fixed. Between the bottomed cylindrical body 16 and the form plate 7, a plate-shaped annular seal packing 19 is interposed as described above. The seal packing 19 is removed after the completion of the concrete structure 26. Since the thumb screw 22 has a smaller diameter than the bolt 9, the inside diameter of the through hole 8 to be drilled in the form plate 7 is substantially smaller, and the work of backfilling is reduced.

According to the FRP insert 31, the contact area of the streak-like projection 23 with the concrete structure 26 is as follows:
As compared with the case of the notch portion 18, the size of the notch portion 18 is increased, so that the detent action is increased.

Further, as shown in FIGS. 6 and 7, an FRP insert 32 according to a third embodiment of the present invention is basically the same as the FRP inserts 30 and 31,
Bottomed cylindrical body 1 formed with bolt screw holes 15 in the axial direction
A plurality of annular projections 17 are formed on an outer peripheral surface of the annular projection 17 at predetermined intervals in a direction intersecting the axis, and at least two annular projections 17 diametrically opposed to each other in the diameter direction of the annular projections 17. , 17, 17, are integrally formed so as to be integrally opposed to each other at least in the diametrical direction at a height higher than the annular protrusion 17 and the streaky protrusion 23 (projecting in the radial direction). The screw hole 21 has a smaller diameter than the bolt screw hole 15 at the center of the inner bottom.

This FRP insert 32 is made of the above FRP
Similar to the inserts 30 and 31, a thumb screw 22 inserted through the through hole 8 of the mold frame 7 with a seal packing 19 interposed on one side of the mold frame plate 7 is screwed into the screw hole 21 and fixed. Between the bottomed cylindrical body 16 and the form plate 7, a plate-shaped annular seal packing 19 is interposed as described above. The seal packing 19 is removed after the completion of the concrete structure 26. Since the thumb screw 22 has a smaller diameter than the bolt 9, the inside diameter of the through hole 8 to be drilled in the form plate 7 is substantially smaller, and the work of backfilling is reduced.

According to the FRP insert 32, the contact area of the streak-like projections 24 with the concrete structure is larger than that of the streak-like projections 23, so that the FRP inserts 30 and 31 have a more detent function than the FRP inserts 30 and 31. Increase significantly.

Thus, a screw hole 21 having a diameter smaller than that of the bolt screw hole 15 is provided at the center of the inner bottom of the bottomed cylindrical body 16 having the annular projection 17 and / or the streak projection 18 formed on the outer peripheral surface. Since the thumb screw 22 having a smaller diameter than the bolt 9 can be screwed into the screw hole 21, the inside diameter of the through hole 8 to be formed in the form plate 7 can be made as small as possible, and the backfill operation is simplified. Quick and easy operation can be achieved. Moreover, the FRP inserts 31 and 32 are not
Since the streak-like projections 23 and 24 having a larger contact area with the concrete structure 26 are integrally formed, the strength of the anti-rotation as an anchor is further improved.

[0030]

According to the first aspect of the present invention, a thumb screw having a diameter smaller than that of a bolt can be used. Therefore, a through hole formed in a form plate for fixing an anchor to the form plate is provided. Since the diameter can be reduced, the operation of backfilling the through-holes can be simplified and speeded up easily, and the work efficiency is improved.

According to the second aspect of the present invention, since the linear projection parallel to the axis is integrally formed between the annular projections, the contact area between the concrete structure and the anchor is improved, and in particular, the detent action is prevented. improves.

According to the third aspect of the invention, when fixing the anchor to the form plate, a thumb screw having a smaller diameter than the bolt can be used, so that the inner diameter of the through hole formed in the form plate is reduced. The workability of backfilling can be improved, and the workability can be greatly improved by using a thumbscrew, since it is sufficient to manually fix the work to the formwork plate without using a jig.

According to the fourth aspect of the present invention, in addition to the effect of the third aspect, the pull-out and detent strength of the anchor embedded in the concrete structure is further improved.

According to the fifth aspect of the present invention, since the bottomed cylindrical body is a molded body made of FRP resin, it can be provided with excellent corrosion resistance, vibration shock resistance, and low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view showing a fourth embodiment of the present invention.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a perspective view showing a third embodiment of the present invention.

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a partial sectional side view showing an application example of the present invention.

FIG. 9 is a partial cross-sectional side view showing an application example of a conventional anchor.

FIG. 10 is a perspective view (A), a plan view (B), and a DD sectional view (C) showing another conventional anchor.

11 is a partial cross-sectional side view showing an application example of the anchor of FIG.

FIG. 12 is a sectional side view showing a state of the anchor of FIG. 10 in the concrete structure.

[Explanation of symbols]

 15: Bolt screw hole 16: Cylindrical body with bottom 17: Annular projection 18: Notch 21: Screw hole 22: Thumb screw 23, 24: Streaked projection 30, 31, 32: FRP insert (anchor)

Claims (5)

[Claims] A plurality of annular projections are formed on an outer peripheral surface of a bottomed cylindrical body having an axial bolt screwing hole at predetermined intervals in a direction intersecting with an axis, and the annular projections are provided. Notches are formed at least at two positions diametrically opposite each other, and a screw hole having a smaller diameter is formed at an inner bottom of the bolt screw hole. anchor. 2. A plurality of annular projections are formed at predetermined intervals in a direction intersecting with the axis on an outer peripheral surface of a bottomed cylindrical body having an axial bolt screwing hole formed therein, and are formed in a diametrical direction. A streak-shaped projection parallel to the axis is integrally formed between at least two annular projections opposed to each other, and a screw hole having a smaller diameter is formed at an inner bottom of the bolt screw hole. An anchor for embedding concrete, comprising: 3. A bolt screw hole of a cylindrical body with a bottom is inserted into an end of a thumb screw inserted into a through hole formed in a mold plate, and a screw hole provided at the center of the inner bottom is inserted into the screw hole. It is screwed, an annular seal packing is interposed between the bottomed cylindrical body and the form plate, and the bottomed cylindrical body has a plurality of annular projections on the outer peripheral surface. Concrete embedding anchor. 4. A bolt screw hole of a cylindrical body with a bottom is inserted into an end of a thumb screw inserted into a through hole formed in a form plate, and a screw hole provided at the center of the inner bottom is inserted into the hole. An annular seal packing is interposed between the bottomed cylindrical body and the mold plate, and the bottomed cylindrical body connects a plurality of annular projections and an annular projection on the outer peripheral surface. An anchor for embedding concrete, having a streak-like projection. 5. The concrete embedding anchor according to claim 1, wherein the bottomed cylindrical body is a molded body made of FRP resin.