JP5557305B2 - Wood reinforcement - Google Patents

Description

  The present invention relates to a reinforcing member for a wooden material that is used by being embedded in a wooden material in assembling a building structural material.

In the shaft assembly method, washers and nuts are most commonly used as means for fixing a bolt-shaped member inserted through a structural material. Specifically, for example, as shown in FIG. 10 as a prior art in Patent Document 1, an anchor bolt 2 as a bolt-like member is embedded in a base 2, the anchor bolt 2 is inserted into an insertion hole 3a of a base 3, and a washer ( The base 3 is fixed on the foundation 2 by tightening with a nut 6 via a washer 5.
Further, in the case of fixing columns and columns, columns and beams, or beams and beams, joint fittings are often used. The design gazette of patent document 2 is mentioned as an example of such a joining metal fitting. The joint fitting (article name for design: beam fixing bracket for building) of this Patent Document 2 is also fixed to the beam by a pulling bolt, a washer and a nut as a bolt-like member as shown in FIG. I am doing so.
JP 2007-132053 (FIG. 10) Similar Design Registration No. 1 of Design Registration No. 899148

In such a configuration, when an external force such as wind or earthquake acts on the building, a large pulling force may be generated on the structural material. For example, when the base is lifted upward as the column is pulled out, a large pulling force may be applied to the washer from the anchor bolt on the foundation side. Similarly, in the above-mentioned joint fitting, if a lateral force is applied to the horizontal member such as the beam, a great tensile force may be applied to the washer. For this reason, conventionally, the area of the washer is made relatively large to reduce the load resistance per unit area, thereby preventing problems such as deformation of the washer and penetration of the washer into the wood part.
However, since the washer part is stored so that the surface (icicle) of the structural material is cut so as not to protrude outward from the surface, increasing the area of the washer increases the amount of cutting of the structural material and increases the strength. It is a problem. Furthermore, a too large washer is not particularly attractive when placed in a particularly visible location.
Therefore, there has been a demand for a reinforcing tool for fixing a bolt-shaped member that can reduce the load applied to the washer without enlarging the area of the washer so much and can oppose the tensile stress.
The present invention is for solving the above-mentioned problems. The object is to provide a reinforcing member for a wood material which can fix a bolt-shaped member even if the tensile strength is large and the washer portion is made small.

In order to solve the above-mentioned problem, in the invention according to claim 1, a foundation fixing structure for fixing a foundation installed on a foundation to the foundation via an anchor bolt embedded in the foundation. A cylindrical main body having a circular hole with a circular cross section penetrating vertically and a lag screw thread portion screwed on the outer periphery, and a flat plate around the main body. And using a wood reinforcement with a washer part formed with a rotational force passive part that can pass the rotational force that rotates in the circumferential direction of the main body, and the upper part of the anchor bolt is inserted through the through hole of the base Then, the hollow hole of the main body is collated with the upper position of the through hole in the state of protruding upward, the rotational force passive part is rotated, and there is a gap between the lag screw screw part and the anchor bolt. Unconnected The outer periphery of in the while bite into wood around the anchor bolt is advanced in the basic direction is brought into contact with the rear surface of the rotational force passive portion on the base, the anchor bolt projecting above the base in that state The gist is that the base member is fixed on the foundation by screwing a nut member into the male screw portion formed on the base.
In such a configuration, the reinforcing member for wood material collates the tip of the main body with the opening portion of the through hole formed in the base, and the rotational force is passively passed by the rotational force passive portion, and the lag screw screw portion causes the lag screw screw portion to act. The main body is advanced into the base while the screw part bites into the wood part around the through hole. At the stage where the washer is disposed around the opening of the through hole, the attachment of the reinforcing tool is completed.
In the reinforcing tool having such a configuration, for example, as shown in FIGS. 14A and 14B, the bolt member 102 is inserted into the hollow hole 101 of the main body 100 so that the male screw 103 protrudes outward from the washer portion 104. By fixing with the nut 105, the reinforcing tool can receive the tensile stress in the direction of the arrow on the bolt member 102 in both the washer portion 104 and the lag screw screw portion 106. 14A and 14B are schematic diagrams, and are not limited to such shapes and configurations.
Here, the foundation in the present invention is not limited to solid wood, but is a concept including plywood, MDF (medium density fiberboard) and particle board.
Also, the lag screw screw is a kind of a spiral triangular screw having a large pitch width with respect to a male screw close to each normal screw thread, and each screw thread is separated and an inner diameter is visually observed with a predetermined width. Since each screw thread is separated, the screw has a strong attractive force.

The gist of the invention according to claim 2 is that, in addition to the configuration of the invention according to claim 1 , the rotational force passive part is disposed on the upper surface of the washer part and around the opening of the hollow hole. And
In such a configuration, in addition to the operation of the first or second aspect, a rotational force passive portion disposed around the opening of the hollow hole on the top surface of the washer portion using a tool such as an impact wrench as the rotational force applying means. A rotational force is applied via the. As described above, the rotational force can be applied to the upper surface of the washer portion, so that the rotational force can be applied even if the lateral space of the washer portion is narrow. As the rotational force passive portion, a hole, a concave portion, a protrusion or the like can be considered.
Further, the gist of the invention described in claim 3 is that, in addition to the configuration of the invention of claim 1 , the rotational force passive portion is formed on the periphery of the washer portion.
In such a configuration, in addition to the operation of the first or second aspect, a tool such as an impact wrench is used as a rotational force applying means via the rotational force passive portion disposed on the upper surface of the washer portion and on the periphery of the washer portion. A rotational force is applied. Thus, torque can be increased because a rotational force can be applied at the periphery of the washer.

In the invention of the above-mentioned claims by configuring as described above, when a tensile stress acts on the bolt member inserted through the base , the wooden material reinforcing tool receives the force at the washer and the lag screw screw part, Compared to the case where the force is received only with the washer as in the prior art, the force is dispersed, and the size of the washer can be relatively reduced as compared with the conventional case.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the wood material reinforcing tool of the present invention are described below with reference to the drawings.
Example 1
As shown in FIG. 1 and FIG. 2, an embedded wooden material for metal material (hereinafter abbreviated as “embedded metal material”) 1 is integrally formed on the main body 2 and the upper part of the main body. A formed washer portion 3 is provided. The main body 2 has a cylindrical shape and has a hollow hole 4 penetrating vertically inside. The hollow hole 4 is circular in cross section. The center of the main body 2 and the hollow hole 4 coincide. The front end 2a of the main body 2 is tapered so as to fall obliquely toward the center over the entire circumference. A lag screw thread portion 5 is screwed on the outer periphery of the main body 2.
The washer portion 3 is a perfect circular disc-shaped plate formed so as to project to the periphery at the upper end of the main body 2. The center of the washer portion 3 coincides with the main body 2. The washer portion 3 is provided with a pair of circular small through-holes 6 at positions facing each other by 180 degrees across the hollow hole 4.

A method of using the embedded metal fitting 1 as a base will be described.
As shown in FIG. 3, a base 11 as a wood material is installed on a concrete base 10. The base 11 is formed with a notch 12 at the top, and a through hole 13 is formed in the notch 12 so as to penetrate vertically. In the present embodiment, the inner diameter of the through hole 13 substantially matches the diameter of the hollow hole 4 of the embedded metal fitting 1, but a slight difference in size is allowed. A protruding portion 15 a of an anchor bolt 15 embedded in the foundation 10 is inserted through the through hole 13, and an upper end portion is exposed in the cutout portion 12 on the base 11. A male screw portion 14 is screwed on the outer periphery near the upper portion of the protruding portion 15 a of the anchor bolt 15. The male screw portion 14 is protruded into the cutout portion 12 at the top. The tip of the male screw portion 14 does not protrude from the cutout portion 12 to the upper surface of the base 11.
For example, an impact wrench 16 as shown in FIG. 13 is used to mount the embedded metal fitting 1 on the base 11. A special tool 17 that can be inserted into the pair of small through holes 6 formed in the washer portion 3 is attached to the socket 16 a of the impact wrench 16.
First, the embedded metal fitting 1 is placed in the vicinity of the upper opening 13a of the through hole 13 while the tip 2a of the main body 2 is covered with the upper end of the anchor bolt 15 as shown in FIG. In this embodiment, the outer diameter of the main body 2 is larger than the through hole 13. In this state, the tip 17a of the special tool 17 of the impact wrench 16 is inserted into the small through hole 6 of the washer portion 3 and driven while applying a load to the impact wrench 16. As a result, the embedded metal fitting 1 is rotated, and the main body 2 is lowered (advanced) by the action of the lag screw screw portion 5 with the through hole 13 as a guide hole while the main body 2 is biting into the wood portion around the through hole 13. The lag screw screw part 5 is screwed into the base 11 while biting into the base 11. As shown in FIG. 5, the mounting of the embedded metal fitting 1 to the base 11 is completed in a state where the back surface of the washer portion 3 is in contact with the upper surface of the notch portion 12. Finally, the nut 18 is screwed into the male screw portion 14 of the anchor bolt 15 projecting upward from the washer portion 3 to fix the base 11 to the foundation 10.

By configuring as in the first embodiment, the following effects are achieved.
(1) Conventionally, when a strong pulling force (tensile force) is applied to the base 11, conventionally, the tensile stress generated in the anchor bolt is held only by the washer. However, by using the embedded metal fitting 1 of the first embodiment, the tensile stress of the anchor bolt 15 can be held by both the washer portion 3 and the lag screw screw portion 5, so that the washer portion 3 is made smaller than the conventional one. can do.
(2) With the passage of time, a phenomenon occurs in which the structural material becomes thin, that is, contracts compared to the original. In that case, conventionally, the washer may float from the base and the base may not be firmly compressed. In this case, if a strong pulling force is applied upward, acceleration is applied, so that the load applied to the washer portion may be larger. In the embedded metal fitting 1 of the first embodiment, since the lag screw screw portion 5 is screwed into the base 11, the washer portion 3 is difficult to float from the base 11, and even if the washer portion 3 is lifted, the lag screw screw portion. Since 5 is screwed to the base 11, it is possible to counter the tensile stress generated in the anchor bolt 15 by the pulling force even when aged.
(3) Since the main body 2 is disposed inside the base 11 so as to surround the periphery of the anchor bolt 15, when the shear stress acts on the anchor bolt 15, the anchor bolt 15 and the anchor bolt 15 are integrally resisted. As a result, it is possible to contribute to an improvement in the yield strength of the shear stress applied to the anchor bolt 15.
(4) Since the tip 2a of the main body 2 is tapered, the main body 2 is easily guided along the axial direction of the through hole 13 when the embedded metal fitting 1 is advanced.

(Example 2)
As shown in FIGS. 6 to 9, the embedded bracket 21 made of an alloy according to the second embodiment includes a main body 22 and a washer portion 23 formed integrally with the upper portion of the main body. The main body 22 has a cylindrical shape, and has a hollow hole 24 penetrating vertically. The hollow hole 24 has a circular cross section. The centers of the main body 22 and the hollow hole 24 coincide. The front end 22a of the main body 22 has a tapered shape so as to fall obliquely toward the central direction over the entire circumference. A lag screw thread portion 25 is screwed on the outer periphery of the main body 22. A female screw portion 26 is screwed on the inner peripheral surface of the hollow hole 24.
The washer portion 23 is a perfect circular disc-shaped plate formed so as to project to the periphery at the upper end of the main body 22. The center of the washer portion 23 coincides with the main body 22. The washer portion 23 is provided with a pair of small through holes 27 having a circular cross section at positions opposed to each other by 180 degrees with the hollow hole 24 therebetween. The embedded metal fitting 21 of the second embodiment has the same appearance as the embedded metal fitting 1 of the first embodiment except that the female screw portion 26 is formed on the inner peripheral surface of the hollow hole 24.

A method of using such an embedded metal fitting 21 for fixing the T-shaped metal fitting 30 to the pillar will be described.
As shown in FIGS. 7 and 8, a T-shaped metal fitting 30 made of rolled steel is composed of a substantially rectangular base plate 31 and an insertion plate piece 32. The insertion plate piece 32 extends rearward from the center so as to be orthogonal to the base plate 31, and the T-shaped fitting 30 as a whole has a substantially T-shaped planar shape. Two cylindrical dowels 33 are provided on the front surface of the base plate 31, and bolt through holes 34 are formed at positions corresponding to the centers of the dowels 33. A semicircular bolt space 35 is formed in the insertion plate piece 32 at a position corresponding to the dowel 33. Further, the insertion plate piece 32 is formed with a notch 36 and two pin through holes 37. The notch 36 and the pin through-hole 37 are locations where a drift pin (not shown) to be described later is engaged.
On the other hand, on two opposite surfaces of the column 38 on which the T-shaped fitting 30 is mounted, a diver groove 39 corresponding to two dowels 33 and a recessed portion 40 for the embedded fitting 21 are formed in advance. A through hole 41 is formed from the center of each of the dive grooves 39 toward the center of the corresponding recess 40.

The mounting of the embedded bracket 21 to the base 11 uses an impact wrench 16 and a special tool 17 as shown in FIG. The special tool 17 is a kind of wrench having a U-shaped bifurcated shape.
First, the front end 22a of the main body 22 of the embedded metal fitting 21 is arranged at the position of the through hole 41 opened to the concave portion 40 side. In this state, the tip of the special tool 17 of the impact wrench 16 is inserted into the small through hole 27 of the washer portion 23 and driven while applying a load to the impact wrench 16. As a result, the embedded metal fitting 21 rotates and moves forward with the through hole 41 as a guide hole while the main body 22 is biting into the wood around the through hole 41 by the action of the lag screw screw portion 25. The lag screw screw portion 25 is screwed into the column 38 while biting. As shown in FIG. 9, the mounting of the embedded bracket 21 to the column 38 is completed in a state where the back surface of the washer portion 23 is in contact with the bottom surface of the recess 40. Next, the pulling bolts 43 are inserted into the through holes 41 from the side of the groove 39 for the bevel, and the male screw 44 is screwed on the inner peripheral surface of the main body 22 of the embedded fitting 21 as shown in FIG. Screwed into the portion 26. In this state, the rear end side of the pulling bolts 43 protrudes toward the diver groove 39 side. Next, the dowel 33 of the T-shaped metal fitting 30 is inserted into the dowel groove 39. Finally, the nut 45 is screwed into the male screw portion 44 on the rear end side of the pulling bolt 43 projecting into the bolt space 35 to fix the T-shaped fitting 30 to the column 38.
Thus, the rigid joint is completed by setting the beam 46 as shown by the arrow in FIG. 7 to the column 38 to which the T-shaped fitting 30 is attached, and fixing the beam 46 from the side by a drift pin (not shown). .

By configuring as in the second embodiment, the following effects are achieved.
(1) Conventionally, when a strong tensile force is applied to the beam 45, the tensile stress generated in the double pulling bolt is held only by the washer. However, by using the embedded metal fitting 21 of the second embodiment, the tensile stress of the pulling bolts can be held by both the washer portion 23 and the lag screw screw portion 25, so that the washer portion 23 is made smaller than the conventional case. can do.
(2) With the passage of time, a phenomenon occurs in which the structural material becomes thin, that is, contracts compared to the original. In that case, conventionally, the washer may float from the column surface and the T-shaped fitting 30 may not be pulled firmly. In this case, if a strong pulling force is applied, acceleration is applied, so that the load applied to the washer portion may become larger. In the embedded metal fitting 21 of the second embodiment, since the lag screw screw portion 25 is screwed into the column 38, the washer portion 23 is difficult to float from the column 38, and even if the washer portion 23 is floated, the lag screw screw portion. Since 25 is screwed into the pillar 38, it is possible to counter the tensile stress generated in the pulling bolts 43 by the pulling force even when aged.
(3) Since the tip 22a of the main body 22 is tapered, the main body 2 is easily guided along the axial direction of the through hole 41 when the embedded metal fitting 21 is advanced.

The above embodiment may be embodied as follows.
-The shape of the said embedded metal fittings 1 and 21 is an example, Comprising: For example, the length of the main bodies 2 and 22, the number of turns of the lag screw screw parts 5 and 25, a pitch, etc. can be changed suitably. Further, the size and thickness of the washer portions 3 and 23 can be appropriately changed.
In the embedded metal fittings 1 and 21, the small through holes 6 and 27 are used as the rotational force passive parts, but other shapes can be used. For example, examples as shown in FIGS. In the example of FIG. 10, instead of the small through holes 6 and 27, a polygonal (here hexagonal) engagement hole 45 having the hollow hole 4 as an inscribed circle is provided near the uppermost part of the hollow hole 4. . For example, a rotational force can be applied by a tool such as a general hexagon wrench. The number of small through-holes 6 and 27 can be appropriately changed to two or more.
Further, in FIGS. 11 and 12, the washer portions 3 and 23 are not circular but formed with a deformed portion so that the rotational force is passively formed. In the example of FIG. 11, the washer portion 46 is polygonal (here, hexagonal). In FIG. 12, the opposite end portions of the washer portion 47 are cut by parallel lines that are equidistant from the center. These can be applied with a rotational force by a tool such as a spanner.
In the above embodiment, the embedded metal fittings 1 and 21 are attached to the base 11 and the pillar 38, respectively, but it is of course possible to use them for other structural materials.
In the above embodiment, the metal embedding brackets 1 and 21 are exemplified as the reinforcing members for the wooden material. However, for example, hard plastic or ceramics may be used as the material other than the metal.
-Besides, it is free to implement in a mode that does not depart from the gist of the present invention.

The partially broken front view which shows the embedding | fitting metal fitting of Example 1 of this invention by fracture | rupturing the right side by a vertical center line. The perspective view of the same embedding bracket. Explanatory drawing explaining the state before attaching to the foundation about the same embedding | fitting metal fittings. Explanatory drawing explaining the state which mounted | wore the same embedding metal fitting and has arrange | positioned in the attachment start position. Explanatory drawing explaining the state which fastened the same embedding metal fitting to the base with the nut from the top. The partially broken front view which shows the embedding | fitting metal fitting of Example 2 of this invention by fracture | rupturing the right side by a vertical center line. Explanatory drawing explaining the state which fixes a T-shaped metal fitting to a pillar with the same embedding metal fitting, and is going to arrange a beam in a T-shaped metal fitting position further. The exploded perspective view explaining the positional relationship of each member at the time of fixing a T-shaped metal fitting to a pillar with the same embedding metal fitting. The partial expanded sectional view of the state which attached the same embedding metal fitting to a pillar, and made the both pulling bolt screwed in the female screw part by the side of an embedding metal fitting. The perspective view of the embedded metal fitting of another Example. The perspective view of the embedded metal fitting of another Example. The perspective view of the embedded metal fitting of another Example. The side view of the state which attached the tool to the impact wrench which provides a rotational force to a present Example. (A) And (b) is explanatory drawing explaining the tensile stress concerning an embedded metal fitting when the embedded metal fitting of this invention is used. (A) And (b) is explanatory drawing explaining the tensile stress concerning an embedded metal fitting when the embedded metal fitting of this invention is used.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,21 ... Wood material reinforcement tool, 2,22 ... Main body, 3,23 ... Washer part, 4,24 ... Hollow hole, 5,25 ... Lug screw screw part, 6, 27 ... Small as a rotational force passive part Through hole, 24 ... female screw.

Claims (3)

A foundation fixing structure for fixing a foundation installed on a foundation to the foundation via an anchor bolt embedded in the foundation,
A cylindrical main body having a hollow hole with a circular cross section penetrating vertically and having a lag screw threaded on the outer periphery thereof, integrally formed on the upper portion of the main body, and projecting in a flat plate around the main body Using a wood material reinforcement with a washer part formed with a rotational force passive part that can passively rotate the rotational force rotating in the circumferential direction of the main body,
With the upper part of the anchor bolt inserted through the through hole of the base and protruding upward, the hollow hole of the main body is collated with the upper position of the through hole, and the rotational force passive part is rotated to turn the lag screw screw In a non-connected state with a gap between the anchor bolts , the part is advanced in the base direction while being bitten into the woody part around the anchor bolts , and the back surface of the rotational force passive part is brought into contact with the base. In this state, the foundation is fixed on the foundation by screwing a nut member into a male screw portion formed on the outer periphery of the anchor bolt protruding above the foundation. Mounting structure for the foundation. The base fixing structure according to claim 1, wherein the rotational force passive portion is disposed on an upper surface of the washer portion and around the opening of the hollow hole. The structure for fixing a foundation to a foundation according to claim 1, wherein the rotational force passive portion is formed on a peripheral edge of the washer portion.

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