JPH0735608U - Ceramic insert nut - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an insert nut to be embedded in concrete whose crack does not reach the deep end. [Structure] A ceramic member is formed with a cylindrical body 4 in which a support bolt insertion hole 2 for engraving an internal thread 3 is formed, and at the end of the cylindrical body 4, a collar-shaped resistor orthogonal to the longitudinal direction is formed. A plate 5 is provided, and a plurality of triangular anti-rotation rib pieces 6 reaching the end of the resistance plate from the cylinder end to the end are projectingly provided on the outer periphery of the cylinder body 4 to form a nut base body portion 1. The end face of the cylinder and the end face of the shear-preventing cylinder 8 having the insertion hole 7 for the support bolt formed of a ceramic member are abutted and connected with an adhesive 9 to form a single nut structure. At times, there is no permeation and inflow into the insertion hole for the support bolt, cracks that occur in the tubular portion 8 during use do not reach the inner nut base portion 1 and the tensile force does not decrease, and the nut base portion 1 is a resistance plate. 5 and the triangular anti-rotation rib piece 6 get the maximum anchoring effect, The turning power can also be stopped.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention also relates to a ceramic insert nut that serves as an embedded support member for a support bolt protruding from a concrete surface or the like.

[0002]

[Prior art]

 Generally, in civil engineering construction, construction, etc., insert nuts for support bolts (anchor bolt mode) that are placed and buried inside the formwork in advance when placing concrete are, in the old days, simply cylindrical with internal threads. Although metal insert nuts exhibiting the above have been the mainstream, metal insert nuts lead to rust and corrosion when used in a concrete embedded state for a long period of time, resulting in uncertain bolt support and so-called rattling. There was a risk that the bolt would fall out. For this reason, in recent years, ceramic insert nuts that do not corrode have been provided 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 device]

 However, the 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 the load applied to the insert nut, it is necessary to endure the tensile force generated in the female screw portion for screwing the support bolt that is mainly mounted and the shearing force generated by the lateral load applied to the edge of the insert nut. If a support bolt is attached to the insert nut, if the shearing force applied to the rim of the cylindrical part of the insert nut facing the concrete surface causes cracks, the taper at the deep end located inside the embedded structure in the integrated structure type There is a risk of cracks extending over the entire length of the support bolt, and by extension the threaded grip of the female screw part that engages the support bolt will also loosen and the prescribed tensile force will decrease, causing the support bolt to fall out (of course If the purity of alumina, which is the material, is increased to nearly 100%, the bending strength etc. will improve, but it will be unprofitable because it is too expensive).

[0006] As this type of insert nut, there is 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 partially (front side cylinder part) in order to correspond to the concrete burial depth. It is equipped with multiple cylinders of different lengths that can be selected, and is removable. In this case, when using it, the structure is to keep the connection state by fitting the plastic collar at the split part.Therefore, there is some play in the collar fitting part, and when the concrete is placed, this concrete milk is connected to the connection gap. In many cases, it infiltrates into the inside to block the insertion hole for the support bolt, and the support bolt cannot be inserted after removing the work bolt after concrete curing, which necessitates repair work.

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 plug hole from being clogged with concrete. The purpose is to provide.

[0007]

[Means for Solving the Problems]

 According to the present invention, a ceramic body is formed with a support bolt insertion hole for engraving a female screw in the back, and a flange-shaped resistance plate orthogonal to the longitudinal direction is formed at the end of the cylinder body. A nut base portion is provided by projecting a plurality of triangular anti-rotation rib pieces extending from the cylinder end to the end of the resistance plate on the outer periphery of the cylinder body to form a nut base portion, and the cylinder end surface of the nut base portion, and a ceramic member. The nut end structure is formed by abutting and connecting the cylinder end surface of the shear-preventing cylinder portion, in which the support bolt insertion hole is formed, with an adhesive.

[0008]

[Action]

 As described above, the ceramic member is a flanged resistance plate at the end of the female threaded cylinder body, the nut base part is formed by projecting a plurality of triangular detent rib pieces on the outer circumference, and measures against shearing of the same member with a specified length. The two parts that form the cylindrical body are made into one nut with an adhesive, so unlike the simple split structure in use, the work bolts can be easily attached, and the connection part (seam) is bonded when concrete is laid. There is no permeation inflow of concrete milk because it is applied with an agent. In addition, since the nut base has a brim-shaped resistance plate orthogonal to the end and a plurality of triangular anti-rotation rib pieces that incline to the outer periphery in sequence, concrete wraps around each valley groove and solidifies to maximize anchorage. It is effective and can withstand the tensile force generated in the support bolt without any deviation in the direction of rotation. In addition, even if a large shearing force is applied to the shear-preventing cylinder portion that is the nut edge when the support bolt is attached, and even if a crack occurs in the cylinder portion, only the cylinder portion receives the shearing force. As a result, cracks do not directly reach the nut base end portion that is the nut body, the screwing degree is not loosened, the prescribed tensile force is not hindered, and there is no risk of falling out.

[0009]

【Example】

 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-shaped resistance plate. Reference numeral 1 is a ceramic member made of an alumina material, and an insertion hole 2 for a support bolt is arranged at the center, and a female screw 3 is provided at the inner portion thereof. A cylindrical body 4 having a predetermined length in which the number of peaks is appropriately cut is formed, and a flange-shaped resistance plate 5 orthogonal to the longitudinal direction is projectingly provided at a rear end of the cylindrical body 4, and a cylindrical body is provided on an outer periphery of the cylindrical body 4. It is a nut base portion formed by projecting a plurality of triangular anti-rotation rib pieces 6 (4 pieces in four directions in the figure) also for reinforcement, which reach from the end 4a to the end of the resistance plate edge 5a. A predetermined adhesive 9 is attached to the cylinder end surface 1a of the base body 1 and the cylinder end surface 8a of the shear-preventing cylinder body portion 8 in which a support bolt insertion hole 7 is formed in the center formed of a ceramic member. To form a single insert nut 10. . In this case, the inner diameter of the female screw 3 of the cylindrical 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 now, first, in forming the ceramic insert nut 10, the nut base portion 1 and the cylindrical body portion 8 which are divided structures are separately formed, and the two are bonded with an adhesive agent 9. And one body.

[0012] Here, when setting a predetermined embedding 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 portion 8) integrated with the adhesive 9, no gap is created in the intermediate connecting portion, and accordingly, the concrete casting is performed in the concrete formwork. Even if the installation is performed, concrete milk does not permeate into the support bolt insertion hole 7 from the connection portion. Further, the concrete flows all over into the troughs 13 formed between the triangular detent rib pieces 6 on the outer periphery of the nut base portion 1 to ensure a reliable buried state.

After this (after the concrete burying step), the work support bolt is removed and a predetermined support bolt 12 is screwed in. In this case, the insertion hole 2 of the nut base 1 and the female screw 3 and the tubular body are Since concrete does not flow into the insertion hole 7 of the portion 8 and there is no blockage of the hole, 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 that is buried in concrete, and a male screw (not shown) at the tip of the support bolt 12 is inserted into the female hole at the back of the insertion hole 2. It is fixed by screwing on the screw 3. 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 tensile force applied to the insert nut 10 is mainly applied to the inner nut base portion 1 at which the support bolt 12 is directly screwed and locked, but the nut base portion 1 is The brim-shaped resistance plate 5 is projecting at right angles, 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. The anchoring effect is obtained and the insert nut 10 does not fall off.

Further, the shearing force applied to the support bolts 12 is directly received at least by 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 exceeding the 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 back The cracking phenomenon at this time is stopped only by the tubular body portion 8 and does not reach the nut base portion 1. Therefore, the screwing grip of the support bolt 12 does not loosen.

[0017]

[Effect of device]

 As described above, the ceramic insert nut of the present invention has the nut base portion provided with the resistance plate and the triangular detent rib piece on the cylindrical body in which the insertion hole for the bolt with the female screw is arranged, and the insertion hole for the bolt. Since it is composed of two parts of the cylinder part for shearing and is connected with an adhesive, it does not cause corrosion in embedding in concrete, and as for the tensile force applied by the mounting bolt to be installed, The nut base part is handled by the screw grip and the anchoring effect of the flanged resistance plate and triangular anti-rotation rib pieces, and will not fall out. Further, the rotational force is prevented by the plurality of triangular anti-rotation ribs and does not loosen around. Furthermore, the shearing force applied to the support bolts can be dealt with by the shearing-preventing tubular portion directly in front. That is, even if the shearing force becomes large and a crack occurs in the cylindrical body, the crack does not directly reach the side of the nut base because the nut base in the back has a different structure. The force and pulling force will not drop. Moreover, in the present invention, since the nut base portion and the shear-preventing tubular portion are integrally connected by an adhesive, concrete milk does not permeate into the bolt insertion hole during pouring of concrete and the hole is not clogged. Has the practical effect of.

[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 Shear Countermeasure Body Part 9 Adhesive

Claims (1)

[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.