JP2715947B2 - Ceramic fasteners for burying concrete walls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic fastener for burying a concrete wall as a buried support member for a support bolt disposed on an existing concrete wall such as a common groove.

[0002]

2. Description of the Related Art Generally, as a support member of a concrete buried type for receiving a support bolt projecting from a wall of a concrete structure such as a building or a civil engineering construction, a predetermined female screw called an insert nut is provided at the center. Cylindrical appliances are known. The aspect of this conventional insert nut is
Usually, an end of an insert nut is previously attached to a concrete formwork at the time of concrete casting, and after the concrete structure is finished, the end of the insert nut is arranged so as to face this wall surface. Further, in this case, as a material of the insert nut, a ceramic insert nut resistant to moisture which does not cause rust, corrosion or the like due to moisture and does not cause cracks on the concrete surface has come to be used. For example, as shown in FIG.
Is the tapered part b and the tip part (front part) where the anchoring effect is increased at the base part.
And an integral or divided structure in which a cylindrical portion c for guiding the support bolt is disposed, and a female screw d for the support bolt is engraved at the center of the tapered portion b (see Japanese Patent Publication No. 3-35456). ).

[0003]

However, in the configuration in which the tapered base end portion and the simple sleeve-shaped tubular portion are combined as described above, only a new embedding mode used at the time of concrete casting is suitable, and an old insert is used. It is not optimal for replacing (repairing) nuts or burying them on existing concrete surfaces. For example, a conventional iron insert nut buried in a concrete surface is corroded and comes out, and a new insert nut is inserted into this hole, or an additional power / communication cable, etc. is inserted into the inner wall surface of the existing common groove. In the aspect of the support nut insert nut for supporting a receiving shelf (building metal) for laying, at least a fitting hole through which a tapered portion end which is the maximum diameter of the insert nut body can be inserted is once formed, and the surface of the insert nut is formed. A mixture of a resin adhesive and a curing agent is applied and filled while being inserted, and the adhesive is cured and fixed.

However, simply filling the gap between the outer periphery of the insert nut main body and the fitting hole with an adhesive and a curing agent,
There is a spot in the bond between the adhesive and the curing agent, and the familiarity with the hole surface is thin, and the insert nut that receives the tensile force of the support bolt may come off after a long-term use. Even if the insert nut body is inserted into the fitting hole while being rotated and the adhesive is filled with the adhesive, the outer peripheral shape of the insert nut body is simply a round bar-shaped cylindrical portion and a tapered portion structure. The adhesive and hardener to be filled slip and are not agitated without being stirred, and there is no rubbing action of strongly pressing the hole surface side (radial direction).
No reliable bonding action can be expected. This is not suitable for a so-called fastener mode in which an insert nut having a conventional structure is immediately embedded in an existing concrete wall surface.

The present invention has been made in view of the above circumstances, and
By providing a stirring blade for adhesive on the outer periphery of the small diameter shaft portion of the fastener body and forming a step structure between the large diameter shaft portion and the small diameter shaft portion, the anchoring effect is increased, and the concrete wall embedding ceramics to solve the above problems It is intended to provide a fastener.

[0006]

According to the present invention, there is provided an integrated ceramic fastener body having a two-stage structure of a ceramic material having a rear portion having a large-diameter shaft portion and a front portion having a small-diameter shaft portion,
A bolt insertion hole is provided in the entire central longitudinal direction of the ceramic fastener body, and a female screw portion is formed in at least a portion of the bolt insertion hole from the position of the large-diameter shaft portion to a part of the small-diameter shaft portion. And a plurality of reinforcing and stirring blades formed on the outer periphery of the small-diameter shaft portion as long wedge-shaped inclined rib pieces extending from the large-diameter shaft step edge to the outer peripheral surface near the front end of the small-diameter shaft portion. It is.

An integrated ceramic fastener body having a two-stage structure of a ceramic material having a rear portion having a large-diameter shaft portion and a front portion having a small-diameter shaft portion is formed, and the entire region in the longitudinal direction of the center of the ceramic fastener body is formed. And a female screw portion is engraved in at least a portion of the bolt insertion hole from the position of the large-diameter shaft portion to a part of the small-diameter shaft portion, and a plurality of bolts are formed on the outer periphery of the small-diameter shaft portion. The reinforcing and stirring blades are formed as long wedge-shaped inclined rib pieces extending from the large-diameter shaft step to the outer peripheral surface near the front end of the small-diameter shaft, and packing for preventing cracks is provided on the front end of the small-diameter shaft. Is attached.

Further, a plurality of reinforcing and stirring blade portions are provided on the outer peripheral surface of the small-diameter shaft portion so as to protrude in the radial direction.

[0009]

As described above, the ceramic fastener main body has a stepped structure in which the rear portion (base portion) has a large-diameter shaft portion and the front portion has a small-diameter shaft portion. When the ceramic fastener is buried in a new fitting hole (receiving hole) drilled in the existing concrete wall, such as replacement of an existing insert nut or additional installation, because the reinforcing and stirring blades are projected. If the resin adhesive and the curing agent are filled into the hole gap while rotating the fastener body at a high speed, the adhesive and the curing agent are forcibly stirred and mixed by the reinforcing and stirring blades projecting from the fastener body. , Pressed firmly against the hole surface, providing a familiar and dense filling. Moreover, since the fastener body itself has a step portion between the large-diameter shaft portion and the small-diameter shaft portion, the pulling load of the supporting bolt is applied to the step portion to increase the anchoring effect (anchoring force) to increase the pull-out resistance, and Reinforcement and stirring blades do not cause rotational displacement,
It becomes a solid burial fixation. In addition, ceramic fasteners are used to prevent cracks attached to the end of the small-diameter shaft part of the fastener body when used on a formwork when constructing a concrete structure, like a conventional insert nut that is buried in advance when casting concrete. The packing does not allow concrete milk to flow into the bolt insertion holes (of course, when burying, a seal is placed at the end of the large-diameter shaft of the fastener body to block the flow from the rear), which hinders the screwing of the support bolts. Not.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings of the embodiments.

FIG. 1 shows an embodiment of a ceramic fastener in which four reinforcing and stirring blades are provided. Reference numeral 1 denotes a ceramic material which is an alumina material, and a bolt insertion hole 2 is provided at the center.
The rear part (back part) is a large-diameter shaft part 3 and the front part is a small-diameter shaft part 4.
A two-stage integrated ceramic fastener body having a stepped portion 1a formed in the middle, and a portion 2b of the small-diameter shaft portion 4 from the large-diameter shaft portion position 2a in the bolt insertion hole 2 of the ceramic-fastener main body 1. A female screw portion 5 is engraved on a long path portion extending along the outer periphery of the small-diameter shaft portion 4, and a reinforcing and stirring blade portion 6 having a predetermined width is provided in all directions (radially) on the outer peripheral surface of the small-diameter shaft portion 4. A predetermined distance s from the step edge 3a to the front edge 4a of the small diameter shaft portion 4.
It is formed as a long wedge-shaped inclined rib piece 6 ′ reaching the outer peripheral surface of a nearby position 4 b separated by (for example, 5 mm), and the whole structure serves as a ceramic fastener 7. Reference numeral 8 denotes a ring-shaped crack-preventing packing made of hard rubber or the like adhered to the front end surface of the small-diameter shaft portion 4. 9 is a seal for closing the end of the bolt insertion hole 2.

Now, the operation will be described. First, when the ceramic fastener 7 is used, for example, a fastener mode for fixing a frame such as a shelf to a concrete wall surface serving as a wall surface of an existing common groove, or conventionally used. When the insert nut is to be replaced, a buried hole 12 which is a receiving hole slightly larger than the ceramic fastener 7 is drilled in the concrete wall surface (concrete structure) A to a certain depth by using an appropriate drilling tool.

Thereafter, the ceramic fastener 7 is inserted into the burial hole 12 with the large-diameter shaft 3 as a tip. At this time, a resin adhesive 13 is put into the gap 14 formed between the ceramic fastener 7 (the large-diameter shaft portion 3 and the small-diameter shaft portion 4) and the buried hole 12 together with a hardening agent (not shown). Fill more. In this case, since the ceramic fastener 7 is previously rotated at a high speed by a tool (not shown) such as a drill, a plurality of adhesives 13 (four in the drawing) filled from the end of the small-diameter shaft portion 4. Since the high-speed stirring is performed by the reinforcing and stirring blade 6 of the above, the adhesive 13 and the curing agent are surely mixed without unevenness, and the reinforcing and stirring blade 6 itself is a long wedge-shaped inclined rib piece 6 ′. As a result, the gap 14 with the buried hole 12 is gradually narrowed toward the back, and the adhesive 13 to be stirred is
Is moved by the centrifugal force as it moves to the back.
Forcibly pressed against a, penetrates into the concrete hole surface, and is filled with familiarity. In addition, ceramics
After a certain period of time, the rotating operation of the fastener 7 is performed using the adhesive 1.
3 starts to harden due to the action of the curing agent and is heavy (high resistance)
Stop where it is. Further, since the reinforcing and stirring blade 6 is formed as a long wedge-shaped inclined rib piece 6 ′ which is inclined from the inner side at a predetermined distance s from the end of the small diameter shaft 4, a predetermined gap is provided between the embedded hole 12 and the small diameter shaft 4. 14 is maintained, the injection of the adhesive 13 and the curing agent is not hindered, and the reinforcing and stirring blade 6 does not appear at the end of the wall surface, so that the finish is good.

As described above, after the adhesive 13 is cured, the ceramic fastener 7 is securely fixed in the buried hole 12. In the construction use, the support bolt 10 is inserted into the bolt insertion hole 2 of the small diameter shaft portion 4 of the ceramic fastener 7 facing the concrete wall A via an angle (not shown) or the like, and the screw portion of the support bolt 10 is inserted. 11 is screwed into the female screw portion 5, and the angle is tightened for mounting.
In this case, even if the thickness of the angle is slightly different depending on the member used, the thread of the female screw portion 5 is formed by engraving a screw in a long path extending from the large diameter shaft portion position 2a to the small diameter shaft portion 4 part 2b. (If necessary, the female screw portion 5 may be engraved on the entire area of the bolt insertion hole 2), so that the length of the support bolt 10 is changed each time the plate thickness of the angle changes. Can be handled without any problems.

In this state, even if a tensile load (pulling force) is applied to the support bolt 10, the ceramic fastener main body 1 has a step portion 1a in the middle between the large diameter shaft portion 3 and the continuous small diameter shaft portion 4. Therefore, the area received by fastening to the concrete structure A becomes larger than that of the conventional shaft type in which the outer shape is simply tapered, and the anchoring effect is increased by that much, and the pull-out resistance is increased. Moreover, this step 1
Even if concentrated stress is applied to a, the large-diameter shaft portion 3 side is wide, and a plurality of reinforcing and stirring blades 6 rise and reinforce in the step portion 1a, and the step angle is a round shape 1b. Does not cause cracking.

When the mode of the ceramic fastener 7 is buried in advance at the time of constructing a concrete structure like a conventional insert nut, an appropriate support jig (not shown) is mounted on the concrete formwork (not shown). If the large-diameter shaft portion 3 of the ceramic fastener main body 1 is disposed at the back and concrete is poured into the formwork, the concrete flows into the entire outer periphery including the reinforcing and stirring blade portions 6, and after a predetermined curing, The fastener 7 is buried in the concrete structure A.

Here, too, the bolt insertion hole 2 of the ceramic fastener body 1 facing the end face of the concrete structure A.
Then, the screw portion 11 at the tip of the support bolt 10 is screwed into the female screw portion 5 at the back and mounted. Even if the support bolt 10 is subjected to a tensile load, the ceramic fastener body 1 has the step 1a disposed in the middle, so that even if a tensile force is applied to the support bolt 10, the receiving and anchoring effect can be obtained by the step 1a. It will become more established. Moreover, the reinforcing and stirring blades 6 (four in the drawing) provided on the outer periphery of the small diameter shaft portion 4 connected to the large diameter shaft portion 3 are made thicker toward the step portion and have a rigid structure in terms of strength. , Can withstand a predetermined pulling pressure.

By the way, if the external dimensions of the ceramic fastener are shown, for example, the large-diameter shaft portion has a length of 30 mm and a diameter of 35 mm.
mm, the length of the small diameter shaft portion is 35 mm, and the diameter is 26 mm.

[0019]

As described above, the ceramic fastener for burying a concrete wall according to the present invention has a stepped structure of a fastener body with a small-diameter shaft portion and a large-diameter shaft portion, and a large-diameter shaft on the outer periphery of the small-diameter shaft portion. A long wedge-shaped reinforcing and stirring blade that is inclined from the step edge protrudes, and a female screw is inserted into a long path portion extending from the large-diameter shaft portion to a part of the small-diameter shaft portion in the bolt insertion hole that penetrates the fastener body. Since the portion is provided, the device can withstand the shearing force applied to the support bolt screwed into the bolt insertion hole. Of course, since the fastener is made of a ceramic which is strong in compressive force, it can maintain a predetermined strength sufficiently. In addition, the main feature of the present invention is a wedge-shaped reinforcing and stirring blade arranged on the small diameter shaft portion which is the front part, and the adhesive and hardening agent filling between the burial holes are accompanied by the high speed rotation of the fastener body. A predetermined hardening is obtained to stir and mix securely, and diffusion rotation is forcibly applied to the buried hole by this rotation, and the ceramic fastener becomes dense (familiar) buried in the buried hole. (Insert nut) can be securely fixed. In addition, since the fastener body is a step portion intermediate between the small-diameter shaft portion and the large-diameter shaft portion, the anchoring effect is increased, and the pull-out resistance withstands the pulling force of the support bolt and increases. In addition, since the packing is attached to the front end of the small-diameter shaft portion, it is well-familiar with the use of the formwork, does not cause the inflow of ready-mixed concrete, and there is no risk of crushing the screw threads. Of course, since the entire fastener body is basically made of ceramics, it is most suitable for use in underground places where moisture does not always occur such as joint grooves without causing corrosion.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a ceramic fastener for burying a concrete wall according to the present invention.

FIG. 2 is a central sectional view of the same.

FIG. 3 is a plan view.

FIG. 4 is an explanatory view showing a state in which an adhesive is filled in a buried hole of concrete.

FIG. 5 is a side view of a conventional ceramic insert nut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceramic fastener main body 2 Bolt insertion hole 3 Large diameter shaft part 4 Small diameter shaft part 5 Female screw part 6 Reinforcement and stirring blade part 6 'Long wedge-shaped inclined rib piece 8 Packing for crack prevention

Claims (3)

(57) [Claims] 1. An integrated ceramic fastener body having a two-stage structure with a step portion having a rear portion having a large-diameter shaft portion and a front portion having a small-diameter shaft portion is formed of a ceramic material.
A bolt insertion hole is provided in the entire longitudinal center area of the fastener main body, and a female screw portion is engraved on at least a portion of the bolt insertion hole from the position of the large-diameter shaft portion to a part of the small-diameter shaft portion, and A plurality of reinforcing and stirring blade portions on the outer periphery of the small-diameter shaft portion are formed as long wedge-shaped inclined rib pieces reaching from the large-diameter shaft portion step edge to the outer peripheral surface near the front end of the small-diameter shaft portion. Ceramic fasteners for burying concrete walls. 2. An integrated ceramic fastener body having a two-stage structure with a step portion having a rear portion having a large diameter shaft portion and a front portion having a small diameter shaft portion is formed of a ceramic material.
A bolt insertion hole is provided in the entire longitudinal center area of the fastener main body, and a female screw portion is engraved on at least a portion of the bolt insertion hole from the position of the large-diameter shaft portion to a part of the small-diameter shaft portion, and A plurality of reinforcing and stirring blades are formed on the outer periphery of the small-diameter shaft portion as long wedge-shaped inclined rib pieces extending from the large-diameter shaft portion step edge to the outer peripheral surface near the front end of the small-diameter shaft portion. A ceramic fastener for burying a concrete wall, wherein a packing for preventing cracks is attached to a front end face of the ceramic wall. 3. The ceramic fastener for burying a concrete wall according to claim 1, wherein a plurality of reinforcing and stirring blade portions are provided on an outer peripheral surface of the small diameter shaft portion so as to protrude in a radial direction.