JP2007030120A - Screw assisting tool of screw type anchor, and method for fixing screw type anchor on stone substrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply fix a screw type anchor using a commercial item. <P>SOLUTION: An anchor 5 comprises: a first screw part 8 screwed into a concrete 6; and a second screw part 9 exposed from the concrete 6. An assisting tool 1 for screwing the anchor 5 comprises a hexagonal high nut 2, and a hexagon heat bolt 3 screwed with the nut from one direction. The high nut 2 is screwed in the second screw part 9 and rotated by a socket bit 4, so that the anchor 5 is screwed and fixed to the concrete 6. Because the high nut 2 does not bite into a screwless part 10, the anchor 5 does not rotate together in removal of the assisting tool 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a screwing aid for a screw-type anchor and a construction method for fixing the screw-type anchor to a stone base material such as concrete.

  For example, when various members are fixed to a concrete structure, a screw-type anchor is used. The screw-type anchor includes a first screw portion screwed into the concrete and a second screw portion exposed from the concrete, and the workpiece is placed on the concrete surface (floor surface, wall surface, wall) with a nut screwed into the second screw portion. It is designed to be fixed to the ceiling surface.

The inventor of the present application, as an improved invention of the screw-in type anchor, in Patent Document 1, forms a narrow unthreaded portion between the first screw portion and the second screw portion, and among the second screw portions. Proposed a structure in which an engaging part (driving part) that fits the driver bit in a relatively non-rotatable manner is integrally provided at the end opposite to the non-threaded part without inhibiting the screwing of the nut into the second threaded part did.
JP 2004-19370 A

  According to the configuration of Patent Document 1, the anchor is screwed and fixed to the concrete with a dedicated driver bit, and another driver bit or wrench is used to rotate the nut for fixing the work. An operator may forget or lose a dedicated driver bit for screwing in. In some cases, it may be desired to screw the anchor and fix the workpiece with one type of driver bit.

  Further, for example, as described in JP-A-2000-160699, there is an anchor of a type that does not have a dedicated engagement portion (drive portion) in the second screw portion. In this case, a nut is provided in the second screw portion. Since the anchor is screwed into the concrete by screwing the screw driver bit, there is a problem that when the driver bit digs into the anchor and the nut driver bit is screwed back, the anchor also rotates and pulls out of the concrete. There has been a demand for a method that allows simple and reliable screwing even for anchors that do not have a dedicated engaging portion.

  This invention makes it a subject to improve such a present condition.

  The present invention includes a screwing aid and a construction method. According to a first aspect of the present invention, there is provided a screw-type anchor having a first screw portion screwed into a stone base material and a second screw portion exposed to the outside of the stone base material. The auxiliary tool includes a high nut screwed into the second screw portion of the anchor, and a headed bolt screwed into the high nut from the opposite side to the second screw portion of the anchor. The tip of the bolt is set so as to hit the end face of the anchor before the high nut is screwed into the second threaded portion.

  On the other hand, the invention of claim 2 is a construction method for fixing a screw-type anchor having a first screw part screwed into a stone base material and a second screw part exposed to the outside of the stone base material to the base material. In this method, the high nut into which the headed bolt is screwed from one end is screwed into the second threaded portion of the anchor, and the headed bolt is rotated by the socket bit of the power driver. A step of screwing the anchor into the pilot hole of the stone base material, and a step of screwing the anchor into the stone base material and then unscrewing the high nut. It is set to hit the end face.

  In the process of screwing the anchor into the base material, friction is generated between the female screw of the high nut and the second threaded portion of the anchor. Therefore, if the anchor is screwed into the base material using only the high nut, the high nut When the high nut is bitten into the anchor and reversely rotated, the anchor also rotates. However, in the present invention, the high nut is not screwed into the second threaded portion of the anchor and the head end face of the head bolt is the end face of the anchor. Therefore, the high nut can be removed from the anchor without causing a phenomenon that the high nut bites into the second threaded portion of the anchor.

  And since it can be easily made as an auxiliary tool on the site using commercially available high nuts and bolts, it is possible to install the anchor even if the dedicated driver bit is forgotten or lost become. Further, as described in Japanese Patent Laid-Open No. 2000-160699, the anchor does not have a dedicated engaging portion, and as described in Japanese Patent Laid-Open No. 10-103323, the engaging portion is connected to the second screw portion. An anchor formed between one screw portion can also be screwed in. Therefore, the range of usable anchors is remarkably widened, and the usability is good.

  Furthermore, since the high nut and the bolt head are generally the same size as the nut that fixes the workpiece, the screwing of the anchor and the workpiece are fixed with one type of driver bit without changing the driver bit to the power driver one by one. Therefore, it is possible to improve the workability by eliminating the trouble of changing the driver bits one by one.

  Next, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 (A) is an exploded view showing the assisting tool and construction method of the present invention, and the assisting tool 1 of the present invention consists of a hexagonal high nut (high nut) 2 and a hexagonal bolt 3 screwed into this. The hexagon bolt 3 and the high nut 2 are rotationally driven by a socket bit 4 attached to a power driver (not shown). The high nut 2 and the hexagon bolt 3 are commercially available, and the thread is a metric thread.

  On the other hand, the anchor 5 includes a first screw portion 8 that is screwed into a prepared hole 7 formed in the concrete 6, a second screw portion 9 that is exposed to the outside of the concrete 6, and a narrow unthreaded portion 10 that separates the two. And an engaging portion 11 into which a dedicated bit (not shown) is fitted is formed on the end surface of the second screw portion 9. Although the tip of the first screw portion 8 is formed flat, it may be pointed.

  The first threaded portion 8 of the anchor 5 is formed with two threads, that is, a main thread 12 having a high height and a sub thread 13 having a low height. The lead angle is about half the outer diameter. On the other hand, the thread of the second threaded portion 9 in the anchor 5 is a metric thread, and the high nut 2 is screwed into the second threaded portion 9.

  The relationship between the dimensions of the high nut 2 and the bolt 3 and the anchor 5 is that the length of the high nut 2 is L1, the length of the shaft portion of the hexagon bolt 3 is L2, and the second screw portion 9 and the engaging portion 11 of the anchor 5 are. When the length obtained by adding the lengths to L3 is L3> (L1-L2).

  FIG. 1B is a plan view of the anchor 5. As shown in this figure, the engaging portion 11 of the anchor 5 has six engaging grooves 11a formed at equal intervals along the circumferential direction. Yes. Needless to say, the outer diameter of the engaging portion 11 (more precisely, the diameter of the circumscribed circle) is smaller than the valley diameter of the second screw portion 9.

  FIG. 2 shows a construction method for fixing the work 14 to the concrete 6 via the anchor 5. In the construction, first, the hexagonal bolt 3 is screwed into the high nut 2 as a pre-process to form the auxiliary tool 1. . And as shown to FIG. 2 (A), the auxiliary tool 1 is attached to the anchor 5 (attachment process).

  Next, by inserting the head of the hexagon bolt 3 into the socket bit 4 and rotating it forward, the first screw portion 8 of the anchor 5 is screwed into the pilot hole 7 of the concrete 6 (screwing step). In this screwing step, since the tip of the hexagon bolt 3 is in contact with the engaging portion 11 of the anchor 5, the anchor 5 is screwed into the pilot hole 7 of the concrete 6 by the rotation of the hexagon bolt 3. The anchor 5 is firmly fixed to the concrete 6 by the unthreaded portion 10 biting into the pilot hole 7 of the concrete 6. In addition, when the head of the hexagon bolt 3 and the posture of the high nut 2 are aligned, the socket bit 4 can be fitted to the end of the high nut 2.

  When the anchor 5 is screwed off, the socket bit 4 is reversed to remove the auxiliary tool 1 from the anchor 5 (removal process). In this case, there are a case where the hexagon bolt 3 comes out of the high nut 2 first and then removes the high nut 2 from the anchor 5 and a case where the entire auxiliary tool 1 is removed from the anchor 5 while being integrated. Since the nut 2 does not bite into the unthreaded portion 10, the accompanying rotation of the anchor 5 does not occur (the high nut 2 is held unrotatable with a spanner and the hexagon bolt 3 is removed, and then the high nut 2 is attached to the anchor 5. It is also possible to adopt the method of removing from the).

  When the auxiliary tool 1 is detached from the anchor 5, the workpiece 14 is fitted into the second screw portion 9 of the anchor 5, and a normal (generally standard height) nut 15 is screwed into the second screw portion 9. Is fixed to the concrete 6. The nut 15 is screwed in by using the socket bit 4 used for fixing the anchor 5 (of course, it is possible to use another spanner (wrench)).

  In FIG. 3, the example of application to the anchor 5 of the type which is not equipped with the engaging part in the end surface of the 2nd screw part 9 is shown. In order to prevent the high nut 2 from biting into the unthreaded portion 10, the combination of the length of the high nut 2 and the length of the hexagon bolt 3 is changed, or the head of the hexagon bolt 3 as shown in FIG. And a washer 16 may be interposed between the nut and the high nut 2.

  The present invention can be embodied in addition to the above embodiments. For example, the high nut is not limited to a commercially available product, and can be manufactured as a dedicated product. Moreover, there is no limitation in the form of the anchor which can apply the auxiliary tool and construction method of this invention, Furthermore, the base material into which an anchor is screwed is not restricted to concrete, Various stone-like materials, such as a brick and a natural stone, are included. Further, when screwing into lightweight cellular concrete, a pilot hole may not be required.

It is a separation front view showing an embodiment of the present invention. It is a figure which shows the construction method. It is a figure which shows the other usage example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Auxiliary tool 2 High nut 3 Hexagon bolt 4 Socket bit 5 Anchor 8 Anchor first screw part 9 Anchor second screw part 10 Unthreaded part 11 Engagement part 14 Work 15 Work fixing nut

Claims (2)

A screwing aid for fixing a screw-type anchor having a first screw portion screwed into a stone base material and a second screw portion exposed to the outside of the stone base material to the stone base material,
A high nut screwed into the second screw portion of the anchor, and a headed bolt screwed into the high nut from the opposite side of the anchor second screw portion, before the high nut is screwed into the second screw portion. Is set so that the tip of the bolt hits the end face of the anchor,
Screw-in anchor screwing aid. A construction method for fixing a screw-type anchor having a first screw portion screwed into a stone base material and a second screw portion exposed to the outside of the stone base material to the base material,
A step of screwing a high nut into which the headed bolt is screwed from one end into the second threaded portion of the anchor, and rotating the headed bolt with a socket bit of a power driver to prepare the anchor with a pilot hole in the stone base material And screwing the anchor into the stone base material and then unscrewing the high nut, and in the screwing step, the tip of the headed bolt is set to hit the end surface of the anchor.
A construction method for fixing a screw-type anchor to a stone base material.

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