JPH0942244A - Anchor for bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor for a bolt to firmly support without driving and besides to reduce the number of parts. SOLUTION: A flange part 5 is formed at the outer peripheral edge of one end part, a conical taper surface 7 is formed at the inner peripheral surface of the other end part, and a rib 4 is axially formed on the outer peripheral surface. An anchor for a bolt comprises a sleeve 1 with a given length in which a plurality of expanding slots 6 with a given length in an axial direction are formed in the other end at intervals of a given distance in a peripheral direction; a bolt 2 with a female screw or a bolt extending through the sleeve 1; and an approximately truncated conical shaped-plug 3 fitted in the other end of the sleeve 1 joined in a screwed-in state with the bolt 2 and having the taper surface 11 making slide contact with the taper surface 7 of the sleeve 1 and a key protrusion part 12 engaged with the splitting slot 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to an internal end portion of a sleeve inserted into a hole formed in a ceiling concrete slab of a concrete building or the like, and a female threaded bolt or bolt passing through the inner end portion of the sleeve and screwed to the bolt. In addition, the present invention relates to a bolt anchor that is expanded by a plug that is prevented from rotating at the inner end of the sleeve so that the expanded part serves as a strong retainer.

[0002]

2. Description of the Related Art Conventionally, many anchor fittings of this type have been provided. For example, the actual exploitation Sho 62-1841
In the expansion anchor described in Japanese Patent Publication No. 3, a split groove is formed at one end of the sleeve, a trapezoidal cross-section plug is inserted into the slit, and the slit is driven into the hole. Stop at and open one end of the sleeve,
It is said that the sleeve is supported in the hole, and when the bolt is screwed into the sleeve, the bolt is supported by the sleeve. A similar device to this is disclosed in JP-A-6-33052.
No. 5 and the anchor described in JP-A-6-116953.

In the driving anchor described in Japanese Patent Application Laid-Open No. Sho 59-147110, a split groove is formed at one end of a sleeve, and a conical taper having a predetermined length is formed on an inner surface of the sleeve. When the push-spread member inserted into the hole is driven toward the bottom of the hole, the tapered portion expands. The same thing as this, 5-9
There is an anchor described in Japanese Patent No. 4333.

[0004]

However, in order to widen one end of the sleeve, the sleeve or the expanding member is driven into the hole, for example, in a water supply / drain pipe in the ceiling of a building,
When fixing the air-conditioning pipes, wiring, etc. with metal fittings such as saddles for suspending and supporting, the work to hit the hammer toward the ceiling has to be done by the worker in the upward direction, and the work efficiency is poor. Since the inner end portion of the sleeve is expanded by hitting, over-driving occurs, the dimensional accuracy is reduced, and variations occur in them, resulting in unevenness and poor finish.

When the sleeve is driven into the wall,
A special tool consisting of a driving rod with a head into which the sleeve is screwed is required, and without it, the hem of the sleeve cannot be expanded without it.

Furthermore, most of the anchors provided so far have at least three or more parts, and it is difficult to reduce the number of parts to less, and there is a limit to the cost reduction, and It couldn't be used if parts were missing.

Therefore, the present invention provides a bolt anchor that can be firmly supported without being driven and has a small number of parts.

[0008]

In the bolt anchor according to the present invention, ribs are axially formed on the outer peripheral surface from one end portion to the other end portion, and a conical taper surface is formed on the inner peripheral surface of the other end portion. At the same time, forming ribs on the outer peripheral surface in the axial direction,
And a sleeve of a predetermined length in which a plurality of split grooves having a predetermined distance in the circumferential direction and a predetermined length in the axial direction are formed in the other end portion,
A bolt with an internal thread or a bolt that penetrates the sleeve,
From a substantially frustoconical plug that is screwed into the bolt and fits into the other end of the sleeve, and has a tapered surface that is in sliding contact with the tapered surface of the sleeve and a key protrusion that engages with the split groove. Become.

Here, the rib has a spiral shape or a straight shape, a cross-sectional shape is a substantially triangular shape, and the height thereof decreases from one end to the other end of the sleeve, so that the rib extends in the longitudinal direction. The sleeve is formed continuously or discontinuously, the sleeve has a flange portion at the end on which the bolt is screwed, and the bolt screw head has a concave portion having a screw portion formed on the inner peripheral surface. Is included.

With the above construction, for example, an anchor having a female threaded bolt passing through a sleeve and a plug screwed into the bolt is inserted into a hole formed in the ceiling, lightly driven and screwed and fixed by a rib, After the brim has stopped overdriving,
When the bolt is rotated in the forward direction and screwed into the sleeve, the plug that is stopped by the key projection that engages with the split groove slides on the tapered surface of the sleeve, and the other end of the sleeve expands and the hole inner wall The anchor is secured to the ceiling so that it can dig in. Therefore, a suspension bolt is added to the female threaded bolt, and the saddle is suspended from the suspension bolt.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. As shown in FIG. 1, the anchor 14 is a sleeve 1
And a bolt 2 penetrating the sleeve 1 and a plug 3 screwed onto the bolt 2.

The sleeve 1 has a tubular body of a predetermined length formed with a spiral rib 4 in the axial direction on the outer peripheral surface thereof, a flange 5 at one end, and a plurality of ribs 5 at the other end at predetermined intervals in the circumferential direction. A split groove 6 having a predetermined length is formed in the axial direction, and a conical tapered surface 7 is formed on the inner peripheral surface thereof. Further, on the outer peripheral surface of the other end portion where the split groove 6 is formed, a stepped and annular root portion 8 is formed. The root portion 8 can be radially expanded outwardly through the split groove 6 and cut into the inner wall of the concrete hole.

By forming the spiral ribs 4 on the sleeve 1, when the sleeve 1 is driven into the building ceiling, the sleeve 1 itself is rotated and screwed through the ribs 4, and the degree of coupling with the building ceiling is improved. . Also, the sleeve 1 has a collar portion 5
By forming the sleeve, the sleeve is prevented from being overdriven, the mouth of the hole in the building ceiling is closed, the appearance is improved, and water is prevented from leaking into the room or the like through the hole.

Although the rib 4 has a substantially triangular cross section, it may be a projection having a conical shape or a polygonal pyramid shape. In short, the rib 1 does not hinder the driving of the sleeve 1 into the building ceiling and enhances the connection with the building ceiling. Any shape may be used. The rib 4 may be linear in the axial direction as shown in FIG. Further, the rib 4 may be formed continuously or discontinuously in the longitudinal direction. The ribs 4 engage and fix the sleeve 1 on the inner wall of the concrete hole and form a rotation stopper for the sleeve 1.

The bolt 2 is a bolt with a female thread and has a predetermined length penetrating the sleeve 1. A hexagonal screw head is formed at one end, a female screw portion 9 is formed at the screw head, and the other end is formed. The threaded portion 10 is formed on the outer peripheral surface of the. A suspension bolt can be screwed into the female screw portion 9. It should be noted that this anchor can be freely used for other than the anchor for the hanging bolt, and in that case, a normal hexagon head bolt having no female screw portion 9 is used.

As shown in FIG. 3, the plug 3 comprises a substantially frustoconical cylindrical body having an outer peripheral surface formed with a tapered surface 11 slidably contacting a tapered surface 7 formed on the inner peripheral surface of the other end of the sleeve 1. , A thread portion is formed on the inner peripheral surface thereof, and the key projection portion 1 is formed on the outer peripheral surface at regular intervals in the circumferential direction and at a predetermined length in the axial direction.
2 is formed. The key protrusion 12 can be inserted into the split groove 6, thereby forming a rotation stopper for the plug 3.

Therefore, when a saddle is provided on the building ceiling with hanging bolts, as shown in FIG.
A hole 16 into which the anchor 14 is to be inserted is formed in the hole 5 by a drill or the like, and the anchor 14 is inserted into the hole 16 as shown in FIG. The anchor 14 is inserted with the bolt 2 in which the washer 13 is fitted in the sleeve 1, and the plug 3 is screwed into the bolt 2 so that the plug 3 is exposed from the other end of the sleeve 1 and the tapered surfaces 6, 11 are formed. Are in sliding contact with each other.

Then, as shown in FIG. 5C, when the bolt 2 is normally rotated and screwed into the sleeve 1, the rib 4 of the sleeve 1 bites into the inner wall of the hole 16 to prevent co-rotation of the sleeve 1. At the same time, the tapered surface 11 of the plug 3 slides on the tapered surface 7 of the sleeve 1 and enters the sleeve 1, whereby the root portion 8 expands and bites into the inner wall of the hole 16. 2 and plug 3 have holes 1
It is fixed in 6 without rattling or shaking.

Therefore, since the sleeve 1 is supported in the hole 16 without coming off, as shown in FIG.
A suspending bolt 17 having a predetermined length is screwed into the female screw portion 9, and a saddle 18 is inserted into the lower end portion of the suspending bolt 17 and is prevented from coming off by a washer 19 and a nut 20.

Further, it is also possible to directly fix a pipe or the like to the building ceiling 15 with a bracket. In that case, as shown in FIG. 7A, a hole 16 into which the anchor 14 is to be inserted is drilled by a drill or the like. Then, as shown in FIG. 7B, the anchor 14 is inserted into the hole 16. For the anchor 14, a normal hexagon head bolt 2a having no female thread is used.

Then, as shown in FIG. 7C, when the bolt 2a is normally rotated and screwed into the sleeve 1, the rib 4 of the sleeve 1 bites into the inner wall of the hole 16 to prevent co-rotation of the sleeve 1. At the same time, the tapered surface 11 of the plug 3 slides on the tapered surface 7 of the sleeve 1 and enters the sleeve 1, whereby the root portion 8 expands and bites into the inner wall of the hole 16. 2a and the plug 3 are fixed in the hole 16 without rattling or shaking.

Therefore, as shown in FIG. 7D, the bolt 2a is reversely rotated and pulled out, and the bolt 2a is inserted into the hole 22 on one end side of the bracket 21 and screwed into the sleeve 1 again to be fixed. To do. Therefore, as shown in FIG.
The pipes 23 and the like are fixed to the building ceiling 15 with a bracket 21 with a high supporting force.

Further, as shown in FIG.
When the sash is attached and fixed to the inner surface side of the square opening 25 formed in the above, the L-shaped bolt 2 is attached to the female screw 2 of the anchor 14 fixed to the building side wall 27 as described above.
4 can also be connected and used as a sash anchor. In this case, the sash can be fixed to the opening by welding the L-shaped bolt 24 to a hook or the like formed in advance on a sash frame (not shown). Further, it is also possible to connect the male screw bolt 2 of the anchor 14 fixed to a concrete slab or a concrete wall to a reinforcing bar 28 engraved with a male screw and use it as a reinforcing bar of an additional reinforced concrete floor or wall.

[0024]

According to the present invention described above, the root portion of the sleeve expands when the sleeve is fixed by driving it into the hole pre-drilled in the building ceiling and applying the rotational force to the bolt to pull the plug. Since it is fixed to the ceiling of the building with high supporting power,
It does not require a dedicated tool as in the past and can be constructed with only a quiet rotating force without impact force that generates impact or sound, thus causing damage or damage to the building ceiling. There is no fear of it and construction is easy.

Further, since the ribs of the sleeve bite into the inner wall of the hole to form a rotation stop without rattling or wobbling, the collar portion prevents overdriving and closes the periphery of the hole in close contact with the sleeve to prevent water stoppage and construction. The appearance of the sleeve is improved, and by using the female threaded bolt, the splicing nut required for connecting the suspension bolt is not required.In addition, since it does not hit the plug, Roughness is sufficient because there is no need to construct the depth carefully and accurately, and therefore construction is easy and construction with high bearing capacity is possible.
There is no need to confirm the pull-out strength.

Moreover, since only three parts, that is, the sleeve, the bolt and the plug, are sufficient, the number of parts can be reduced, the manufacturing, storage and management can be carried out easily and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an exploded front view (A) and a sectional front view (B) of FIG.

FIG. 3 is a perspective view of a plug.

FIG. 4 is a front view showing another example of the sleeve.

FIG. 5 (A) to (C) are explanatory views of action.

FIG. 6 is a front view, partially in section, in which a saddle is formed by hanging bolts.

7 (A) to 7 (D) are explanatory views of other actions.

FIG. 8 is an explanatory view of the action of fixing pipes and the like to the ceiling.

FIG. 9 is an explanatory view of an operation used as a sash anchor and a streak.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sleeve 2 ... Bolt 3 ... Plug 4 ... Rib 5 ... Collar 6 ... Split groove 7, 11 ... Tapered surface 8 ... Root 9 ... Female thread 10 ... Screw 12 ... Key projection 13 ... Washer 14 ... Bolt anchor

Claims (9)

[Claims] 1. A rib is axially formed on an outer peripheral surface near one end to the other end, a conical taper surface is formed on an inner peripheral surface of the other end, and the other end is circumferentially formed. A sleeve having a predetermined length in which a plurality of split grooves having a predetermined interval and a predetermined length in the axial direction are formed, a bolt or a bolt with a female screw penetrating the sleeve, and the other end of the sleeve screwed to the bolt. An anchor for a bolt, comprising a substantially frustoconical plug having a tapered surface that is fitted into the tapered surface of the sleeve and a key projection that engages with the split groove. 2. The anchor for a bolt according to claim 1, wherein the rib is formed in a spiral shape. 3. The anchor for a bolt according to claim 1, wherein the rib is formed in a linear shape. 4. The bolt anchor according to claim 1, wherein the rib has a substantially triangular cross section. 5. The bolt anchor according to claim 1, wherein the height of the rib is reduced from one end to the other end of the sleeve. 6. The bolt anchor according to claim 1, 2, 3, 4 or 5, wherein the rib is formed continuously in its longitudinal direction. 7. The bolt anchor according to claim 1, wherein the rib is formed discontinuously in the longitudinal direction. 8. The sleeve has a collar portion formed at an end portion on the side where the bolt is screwed in.
Anchor for bolt according to 3, 4, 5, 6 or 7. 9. The bolt screw head is provided with a recess having a threaded portion formed on the inner peripheral surface thereof.
Anchor for bolt according to 2, 3, 4, 5, 6, 7 or 8.