JP2510069Y2 - Ceramic insert nut - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic insert nut which serves as an embedded support member for a support bolt projecting from a concrete surface or the like.

[0002]

2. Description of the Related Art In general, insert nuts for support bolts (anchor bolts) that are previously placed and buried inside a formwork during construction of concrete in civil engineering construction, construction, etc., are formerly internally threaded. Although metal insert nuts that have a simple tubular shape were the mainstream, metal insert nuts lead to rust and corrosion when used in concrete for long-term use, and bolt support is not reliable, so-called rattling easily occurs, Furthermore, the bolt could fall out. Therefore, in recent years, ceramic insert nuts that do not corrode have been provided along with the development of ceramics processing.

For example, as a conventionally known ceramic insert nut, as disclosed in Japanese Patent Publication No. 3-35456, a female screw is provided inside the base end (back end) and an anchoring effect is provided on the outer periphery. It has an integral structure with a predetermined length and a tapered portion.

[0004]

[Problems to be Solved by the Invention] However, a ceramic insert nut is not without problems. A problem with ceramic products is that if a crack is found in one place, it will spread throughout the product. That is,
As a load applied to the insert nut, it is necessary to endure a tensile force mainly generated in a female screw portion where a supporting bolt to be mounted is screwed and a shearing force generated by a lateral load applied to an edge of the insert nut. If a support bolt is attached to the insert nut, if a crack occurs due to the shearing force applied to the edge of the cylinder of the insert nut facing the concrete surface,
In the case of the one-piece structure type, cracks extend over the entire length in the longitudinal direction up to the taper part at the innermost end located inside the burial, and by extension, the threaded grip of the female screw part that screws the support bolt loosens and the prescribed tensile force is reduced. , The support bolt may fall out (of course, the purity of alumina, which is the material of ceramics, should be 1
Bending strength etc. improves if it is raised to nearly 00%, but it is too expensive to be profitable).

As an insert nut of this type,
There is also a split type that is divided into the front and rear in the longitudinal direction, but the purpose of the conventional split type insert nut is to match the concrete burial depth, so that the length of a part (front cylinder part) can be selected It is equipped with a cylinder of a book and is removable. In this case, it is a structure to keep the connected state by fitting a plastic collar to the divided part during use, and therefore there is some play in the collar fitting part,
When pouring concrete, this concrete milk often infiltrates into the interior from the connection gap and blocks the insertion holes for the support bolts, so the support bolts cannot be inserted after removing the work bolts after concrete curing, and repair work is not possible. Will be forced to.

In view of the above situation, the present invention has a split structure in which the insert nut is attached with an adhesive to minimize the cracking phenomenon, withstand a predetermined tensile force, and prevent the concrete from clogging the bolt insertion hole. The purpose is to provide.

[0007]

According to the present invention, a ceramic member is provided with a cylindrical body having an insertion hole for a support bolt in which a female screw is engraved in the inner part thereof, and a longitudinal direction is formed at the end of the cylindrical body. A flange-shaped resistance plate orthogonal to the base plate, and a plurality of triangular anti-rotation rib pieces projecting from the cylinder end to the end of the resistance plate on the outer periphery of the cylinder to project to form a nut base portion. The end face of the cylinder and the end face of the shear-preventing tubular body in which the insertion hole for the support bolt formed of the ceramic member is disposed are abutted and connected with an adhesive to form a single nut.

[0008]

As described above, a ceramic member is provided with a flange-shaped resistance plate at the end of a female threaded cylindrical body, a nut base portion having a plurality of triangular anti-rotation rib pieces projecting on the outer periphery thereof, and a member having a predetermined length. Since two nuts that make up the anti-shear cylinder are glued together to form a single nut, the work bolts can be easily attached, unlike the simple split structure, and the joints (seams) are glued when pouring concrete. There is no permeation inflow of concrete milk as it is applied with an agent. In addition, since the nut base has a flange-shaped resistance plate orthogonal to the end and a plurality of triangular anti-rotation rib pieces that sequentially incline to the outer periphery, concrete wraps around each valley groove to solidify and maximize the anchoring effect. And withstands the tensile force generated in the support bolt without any deviation in the rotation direction. In addition, even if a large shearing force is applied to the shear-preventing tubular portion that becomes the nut lip when the support bolt is attached, and even if the tubular portion is cracked, only the tubular portion receives the shearing force. As a result, cracks do not reach directly to the nut base end portion which is the nut body, the screwing degree is not loosened, the predetermined tensile force is not hindered, and there is no fear of falling out.

[0009]

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 an insert nut having a disc structure of a resistance plate. Reference numeral 1 is a ceramic member made of an alumina material, and an insertion hole 2 for a support bolt is provided at the center thereof, and a female screw 3 is appropriately provided at the inner portion thereof. A cylindrical body 4 having a predetermined length in which the number of peaks is engraved is formed, and a collar-shaped resistance plate 5 orthogonal to the longitudinal direction is projectingly provided at the end of the cylindrical body 4, and a cylindrical end 4a is formed on the outer periphery of the cylindrical body 4. A plurality of triangular anti-rotation rib pieces 6 for reinforcement and reaching the end of the resistance plate edge 5a (4 pieces in four directions in the figure)
And a cylindrical end face 1a of the nut base portion 1 and a cylindrical end face 8a of a shearing countermeasure cylindrical body portion 8 having a support bolt insertion hole 7 formed in the center formed of a ceramic member. With a predetermined adhesive 9 on which the ceramics are attached, and form a butt-to-butt contact connection, and a single insert nut 10
Is configured. In this case, the inner diameter of the female screw 3 of the tubular body 4 is set smaller than the inner diameter of the insertion hole 2. Reference numeral 11 denotes a cap made of plastic or the like for closing the end opening of the female screw 3 of the nut base portion 1.

Explaining this action, first, when molding the ceramic insert nut 10, the nut base portion 1 and the cylindrical body portion 8 which are divided into separate parts are separately formed, and both are bonded with an adhesive 9. The body.

Here, at the time of setting to a predetermined burying position in a concrete formwork (not shown) when constructing a concrete surface such as a retaining wall or a building wall, insert with a predetermined work support bolt (not shown). The nut 10 is set so that the end surface of the tubular body 4 faces the mold. In this case, since the insert nut 10 has two parts (the nut base portion 1 and the tubular body portion 8) integrated with the adhesive 9, no gap is created in the intermediate connection portion, and therefore, the concrete is cast in the concrete formwork. Even if the above procedure is performed, the concrete milk does not permeate into the support bolt insertion hole 7 from the connection portion. Further, the concrete also flows into the troughs 13 formed between the triangular detent rib pieces 6 on the outer periphery of the nut base portion 1 all over, so that the concrete is securely embedded.

After this (after the concrete burying step), the working support bolt is removed and a predetermined support bolt 12 is screwed in. In this case, the insertion hole 2 and the female screw 3 of the nut base portion 1 and the tubular body portion are formed. Since the concrete does not flow into the insertion hole 7 of 8 and the hole is not blocked, the insertion of the support bolt 12 is not hindered.

Here, the support bolt 12 is inserted into the insertion hole 2 of the insert nut 10 which is buried in concrete,
A male screw (not shown) at the tip of the support bolt 12 is screwed into and fixed to a female screw 3 at the inner part of the insertion hole 2. In this state,
For example, an appropriate support (not shown) is attached to the support bolt 12 protruding on the concrete surface.

In this state, the pulling force applied to the insert nut 10 is mainly applied to the inner nut base portion 1 to which the support bolt 12 is directly screwed and locked, and the nut base portion 1 has a flange at the end. -Shaped resistance plate 5 is projected orthogonally, and a plurality of triangular anti-rotation rib pieces 6 projecting on the outer periphery have a wedge-like action against the pulling direction, and are tube reinforcements, which is the maximum anchorage. Effective, insert nut 10
There is no omission.

Further, the shearing force applied to the support bolt 12 is directly received by at least the shearing countermeasure cylindrical body portion 8 which is located in front of the insert nut 10. In this case, even if a large shearing force is applied to the support bolt 1 and a load greater than a set value is applied to the rim of the tubular body portion 8 and the tubular body portion 8 is cracked, the tubular body portion 8 and the inner portion of Nut base part 1
Because of the divided structure, the cracking phenomenon at this time stops only in the cylindrical body portion 8 and does not reach the nut base portion 1. Therefore, the screwing grip of the support bolt 12 is not loosened.

[0017]

As described above, the ceramic insert nut of the present invention has a nut base portion in which a resistance plate and a triangular detent rib piece are provided in a cylindrical body having a female threaded bolt insertion hole, and a bolt. Since it is composed of two parts, a cylindrical part for shearing with an insertion hole, and is connected with an adhesive, it does not cause corrosion in embedding in concrete, as well as the tensile force applied by the mounting bolt to be mounted. On the other hand, the nut base portion at the back is handled by the gripping effect of the screw and the anchoring effect of the flange-shaped resistance plate and the triangular detent rib piece, and does not fall out. Further, the rotational force is prevented by the plurality of triangular detent ribs and does not loosen. Furthermore, the shearing force applied to the support bolts can be dealt with by the shearing countermeasure tubular portion directly in front of which the shearing force is applied. That is, even if the shearing force becomes large and the cylindrical body part is cracked, the cracking does not reach the nut base part side directly because the nut base part at the back has a different structure, and the bolt gripping The force and pulling force will not drop. Moreover, in the present invention, since the nut base portion and the shearing prevention tubular portion are integrally connected by an adhesive, concrete milk does not permeate into the bolt insertion hole during concrete pouring and the hole is not clogged. Has a practical effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an insert nut of the present invention.

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

FIG. 3 is a plan view.

[Explanation of symbols]

 1 Nut Base Part 2 Support Bolt Insertion Hole 3 Female Screw 4 Cylindrical Body 5 Collar Resistor Plate 6 Triangular Detent Rib Piece 7 Support Bolt Insertion Hole 8 Shearing Countermeasure Body 9 Adhesive

Claims (1)

(57) [Scope of utility model registration request] 1. A ceramic member is formed with a cylindrical body having an insertion hole for a support bolt in which a female screw is engraved in the inner part, and a collar-shaped resistance plate orthogonal to the longitudinal direction is formed at the end of the cylindrical body. A nut base portion is provided by projecting a plurality of triangular anti-rotation rib pieces reaching the edge of the resistance plate from the cylinder end to the end on the outer periphery of the cylinder body to form a nut base portion. An insert nut made of ceramics, which is formed by abutting and connecting the tubular end surface of the shearing countermeasure tubular body portion having the insertion hole for the support bolt formed therein with an adhesive.