JP2009084884A - Clamping structure and building member connecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extremely epoch-making clamping structure of excellent practicability restraining a nut, a washer and a bolt from projecting from a clamped surface to solve a problem caused by the projection of the nut, washer and bolt from the surface of a building member in clamping to connect building members to each other, and to provide a building member connecting structure. <P>SOLUTION: In this clamping structure, a through hole 4a is formed in the center of the washer 4, and the through hole 4a is set in hole shape having a tapered part 5 reduced in diameter toward the pressing surface side of the washer 4 abutting on the clamped surface (a). A screw member 3 is formed in cylindrical shape, and an internal thread 3a screwed with a screw rod 2 is formed on the inner peripheral surface, while the outer peripheral surface is shaped to have a tapered part 6 coinciding with the tapered part 5 of the though hole 4a in the center of the washer 4. When the screw member 3 is screwed with the screw rod 2 and turned to fasten, the screw member 3 falls to fit into the through hole 4a into a position where the tapered part 5 of the through hole 4a of the washer 4 and the tapered part 6 of the screw member 3 coincide and abut each other to clamp and press the washer 4 to the clamped surface (a). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tightening structure used when, for example, building members are fastened and connected, and a building member connecting structure.

  For example, in a wooden construction, when connecting a foundation and a base, an anchor bolt (screw thread) standing on the foundation is inserted into an insertion hole formed in the base and screwed to the tip of this bolt. The foundation and the base are fastened and fixedly connected by fastening the (screwing member) to the base via a washer. At this time, the protrusion of the screw member, the washer, or the tip of the screw rod from the surface of the base is esteemed from the viewpoint of construction.

  Therefore, for example, as disclosed in Patent Document 1, a counterbored groove is provided in a position on the surface of a building member so as to communicate with the insertion hole through which the bolt is inserted, and the bottom surface of the counterbored groove is used as a tightening surface. A so-called counterbore process is implemented in which a nut, a washer, and a bolt are not projected on the surface of a building member by configuring the nut and washer to be disposed in the groove.

  However, if the counterbored groove is formed deeply, the strength of building parts (especially wooden building parts) will be reduced accordingly, so that the nuts, washers and bolts protrude from the clamping surface so that the depth of the counterbored grooves can be set shallow. It is desirable to minimize this.

  Nonetheless, the anchor bolt's protruding dimension has an error every time it is constructed, so if you set the bolt's protruding dimension to a very short length in advance, the protruding dimension may be insufficient depending on the installation error. If the projecting dimension is insufficient, the counterbore groove will be deepened in the end as a result.

  Further, the tensile strength in the axial direction of the bolt is determined not only by the strength of the bolt itself but also by various factors such as the area of the washer and the allowable allowable stress of the building member to which the washer is tightened and pressed. Therefore, the greater the required tensile strength of the bolt, the larger the washer area and the greater the thickness. As a result, the counterbored grooves are deepened and the strength of the building member is weakened.

  Conventionally, by integrating the nut and the washer, there has conventionally been a technique for suppressing the thickness and reducing the depth of the protrusion and the counterbored groove by a smaller amount than the original one in which the nut is superposed on the upper surface of the washer.

  However, such an integral molding of a nut and a washer has various drawbacks such as difficulty in providing a variety of sizes such as the area and thickness of the washer portion from the viewpoint of process, accuracy, and cost. (Most of the integral molding requires a cumbersome process of forming a washer part into a part of the nut by crushing the nut shaft part called cold forging, and the area of the washer part is proportional to the shaft diameter of the nut shaft part. There is also a limit to the area setting.)

  In other words, in comparison with the original general washer that can be easily designed and manufactured by press working, the washer part is formed integrally with a part of this nut, depending on the required tensile strength. As described above, this type has many drawbacks and is not practical.

JP 2006-274626 A

  The present invention finds and solves the problems as described above, and does not require troublesome work and extremely high cost, and is simply tightened with a simple structure that can be easily performed with the same work procedure and cost as before. It is an object of the present invention to provide an epoch-making fastening structure and a building member connection structure that exhibit unprecedented effects such as being able to satisfactorily suppress the protrusion of the screwing member from the attached surface.

  The gist of the present invention will be described with reference to the accompanying drawings.

  The washer 4 is brought into contact with the tightening surface a by the screwing member 3 that abuts the washer 4 on the tightening surface a and is screwed into the screw rod 2 that is inserted into the insertion hole 1 formed in the tightening surface a. In the tightening structure for tightening and pressing, a through hole 4a is formed in the center of the washer 4, and the through hole 4a is tapered toward the pressing surface side of the washer 4 contacting the tightening surface a. The screw member 3 is formed into a cylindrical shape, and a female screw 3a that engages with the screw rod 2 is formed on the inner peripheral surface thereof, and the outer peripheral surface passes through the center of the washer 4. It is formed in a shape having a tapered portion 6 that matches the tapered portion 5 of the hole 4a, and when the screw member 3 is screwed into the screw rod 2 and tightened and rotated, the through hole 4a of the washer 4 is formed. The screwing member 3 is moved to a position where the taper-like part 5 and the taper-like part 6 of the screwing member 3 come into contact with each other. Those of the clamping structure, characterized in that the washer 4 drop fitted into the through hole 4a and configured to press fastening to the clamping surface a.

  Further, the tapered portion 5 of the through hole 4a of the washer 4 is formed in a conical taper shape that continuously reduces in diameter toward the pressing surface side of the washer 4 that contacts the fastening surface a, and the screw member The taper-like portion 6 on the outer peripheral surface 3 is formed in a conical taper shape that matches the taper-like portion 5 of the through hole 4 a of the washer 4.

  The screw member 3 has a female screw 3a formed on the inner peripheral surface thereof, and has a diameter larger than that of the screwed portion 3A at the base end of the screwed portion 3A that can be screwed onto the screw rod 2. The head 3B having the tapered portion 6 is provided on the outer peripheral surface, and the screwing portion 3A of the screw member 3 can be inserted into the through hole 4a of the washer 4 and the screw rod 2 And a diameter that can be screwed and inserted into a gap between the screw rod 2 and the insertion hole 1 of the fastening surface a through which the screw rod 2 is inserted. The fastening structure according to any one of claims 1 and 2.

  Further, the threaded portion 3A of the screw member 3 is inserted through the through hole 4a of the washer 4, and the tapered portion 5 of the through hole 4a of the washer 4 and the head portion 3B of the screw member 3 are tapered. When the screwing member 3 is lowered into the through hole 4a and fitted to the position where the portion 6 is in abutting contact, the tip of the screwing part 3A of the screwing member 3 protrudes downward from the through hole 4a. 4. The fastening structure according to claim 3, wherein the length dimension of the screwing portion 3A of the screwing member 3 is set.

  Further, a connecting bolt 杆 such as an anchor bolt standing on the building member is used as the screw 杆 2, and the surface of the other building member through which the bolt through hole through which the screw 杆 2 is inserted is formed, or this The bottom surface of the counterbored groove 7 provided in the surface of one building member is used as the tightening surface a, and the bolt through hole formed in the tightening surface a is configured as the insertion hole 1. A screw rod 2 erected on the building member is inserted and disposed in the insertion hole 1 of the other building member, and the screw member 3 screwed to the screw rod 2 is attached to the fastening surface a via the washer 4. The fastening structure according to any one of claims 1 to 4, wherein the fastening structure according to any one of claims 1 to 4 is used as a fastening structure that fastens and connects the building members by fastening.

  In the present invention, as described above, the screw member is not simply brought into contact with the mounting state on the upper surface of the washer (the upper surface when the pressing surface that contacts the tightening surface of the washer is the lower surface). Since the washer is clamped and pressed against the tightening surface at a position where it has been depressed by a predetermined amount into the through-hole, the protrusion of the screwing member from the tightening surface can be reliably suppressed.

  Moreover, since the screwing member falls into the through hole of the washer, the projecting dimension from the fastening surface at the tip of the screw rod to which the screwing member is screwed can be set small.

  Therefore, for example, if the present invention is applied to a fastening structure in which building members are connected by fastening an anchor bolt (screw 杆) and a nut (screw member), a screw member, a washer, and a screw か ら from the fastening surface. According to the present invention, which can suppress the protrusion of the building member, the counterbore groove can be set shallowly even when the building member is subjected to the counterboring process, and the strength of the building member can be kept high as much, and troublesome work and remarkably high cost are not required. Innovative tightening structure that demonstrates unprecedented effects, such as being able to easily suppress the protrusion of the screwing member from the tightening surface while having a simple structure that can be easily implemented with the same work procedure and cost It becomes.

  In the inventions according to claims 2 to 4, the tightening structure is extremely excellent in practicality, in which the above-mentioned operational effects are further improved and reliably exhibited.

  In particular, in the invention according to claim 2, the tapered portion of the through hole of the washer is not formed in a multistage shape that is intermittently reduced in diameter, but is formed in a tapered shape having a conical taper shape that is continuously reduced in diameter. Since the tapered portion of the screw member is formed in a conical taper shape that matches this, the conical taper taper portion of the washer can receive a wide range of tightening pressure of the screw member (taper taper). When the shape part is a multi-stage shape, the surface that receives the tightening pressure is narrower than that of the conical taper shape.) Therefore, the tightening pressure can be received in a wide area by the tapered part of the washer, and tightened more firmly. Is possible.

  In particular, in the third and fourth aspects of the invention, since the head having the tapered portion is provided on the proximal end side of the screwed portion of the screw member, the taper portion and the washer of the screw member are provided. When the screw member is lowered into the through hole and fitted to a position where the tapered portion of the through hole is in abutting contact, the portion of the screw member in which the female screw is formed surely falls into the through hole of the washer. Therefore, the amount of protrusion of the screw rod from the tightening surface can be surely set to be small. In addition, depending on the design, it is possible to easily design and realize a configuration in which the screwed portion at the tip of the screwed member can be screwed into the screw rod in the insertion hole of the tightening surface. If this is the case, it is not necessary to project the screw rod from the tightening surface, so it is possible to eliminate the protrusion of the screw rod from the tightening surface, and the screw member and screw rod can be used regardless of dimensional errors during construction. With a sufficient allowance for the hanging amount, it can be firmly screwed in and has a more practical structure.

  Further, in the invention according to claim 5, it is possible to provide an excellent construction member connecting structure that exhibits the above-described effects, and in particular, when the wooden construction member is subjected to counterboring, the counterbored groove is set shallow. As a result, it is possible to prevent the weakening of the strength of the wooden building members, and the building member connecting structure is epoch-making and excellent in practicality.

  Embodiments of the present invention that are considered suitable (how to carry out the invention) will be briefly described with reference to the drawings, illustrating the operation of the present invention.

  In the present invention, the washer 4 is brought into contact with the tightening surface a, and the washer 4 is fastened by the screw member 3 screwed into the screw rod 2 inserted through the insertion hole 1 formed in the tightening surface a. This is a tightening structure that tightens and presses against the abutting surface a. As in the embodiment described later, a connecting bolt 杆 such as an anchor bolt standing on a building member is used as the screw 杆 2, and the screw 杆 2 is inserted and disposed. The surface of the other building member formed through the bolt hole or the bottom surface of the counterbored groove 7 formed in the surface of the other building member is defined as the tightening surface a and is formed on the tightening surface a. The bolt through hole is configured as the insertion hole 1, and the screw rod 2 erected on the one building member is inserted into the insertion hole 1 of the other building member and screwed to the screw rod 2. The screw member 3 is fastened to the fastening surface a via the washer 4 As fastening structure fixedly connected fastening building members each other, the case of applying the clamping structure of the present invention will be described as an example.

  The washer 4 has a structure having a through hole 4a in the center as in the case of an existing general washer. However, the through hole 4a is not a straight hole having a constant diameter, but the pressing surface side of the washer 4 (of the building member). This is a surface set in contact with the tightening surface a, and is configured to have a hole shape having a tapered portion 5 whose diameter decreases toward the lower surface side in FIG.

  On the other hand, the screwing member 3 that clamps and presses the washer 4 against the tightening surface a is formed in a cylindrical shape like a conventional general nut, and a female screw 3a that engages with the screw rod 2 on its inner peripheral surface. Although it is the structure formed, the outer peripheral surface is formed in the shape which has the taper-shaped part 6 which corresponds with the taper-shaped part 5 of the through-hole 4a of the said washer 4. As shown in FIG.

  A screw rod 2 (anchor bolt) erected on one building member is inserted and disposed in the insertion hole 1 of the other building member, and the building member is tightened by a screw member 3 screwed on the screw rod 2. By tightening and pressing the washer 4 on the attachment surface a and fastening the screw member 3 to the fastening surface a via the washer 4, the building members can be fastened and connected together.

  At this time, the screw member 3 simply abuts on the flat upper surface of the washer 4 (upper surface when the pressing surface of the washer 4 abutting on the fastening surface a as shown in FIG. 1 is the lower surface) in the mounted state. Rather than pressing the washer 4 against the fastening surface a, the washer 4 is screwed to a position where the tapered portion 5 of the through hole 4a of the washer 4 and the tapered portion 6 of the screwing member 3 are in contact with each other. The wearing member 3 drops into the through-hole 4a and fits and presses the washer 4 against the fastening surface a.

  That is, the present invention does not require troublesome work, and can be fastened and fixed in the same procedure as in the conventional tightening structure, and the screwing member 3 is inserted into the through hole 4a of the washer 4 by a predetermined amount. By doing so, the protruding dimension of the screwing member 3 from the tightening surface a can be suppressed accordingly.

  For example, when the washer 4 is set to be thick in order to achieve a strong connection strength (a tensile strength in the axial direction of the screw rod 2), the projecting dimension of the washer 4 and the screwing member 3 from the tightening surface a increases accordingly. In the case where the counterboring process is performed so that the screwing member 3 or the like does not protrude from the surface of the building member, if the protruding dimension is increased in this way, the counterbore groove 7 must be formed deeper, and the strength of the building member is increased. It will weaken.

  However, according to the present invention, even if the thickness of the washer 4 is increased, the screwing member 3 can be lowered into the central hole 4a of the washer 4 to reduce the projecting dimension. Even in this case, the counterbore groove 7 can be formed shallowly, and the strength of the building member is excellent. Further, the matching contact between the tapered portion 5 of the washer 4 and the tapered portion 6 of the screwing member 3 can ensure a large contact area between them, and the screwing member 3 can firmly tighten the pressing force of the washer 4 accordingly. It can be carried out satisfactorily and is extremely suitable when high connection strength and high strength of the building member itself are required.

  Further, according to the present invention, as described above, the screw member 3 drops into the through hole 4a of the washer 4 and is close to the tightening surface a side. The length by which the tip protrudes from the insertion hole 1 of the tightening surface a can be set small. For example, depending on the design, the female screw 3a is formed on the inner peripheral surface of the screw member 3 as in an embodiment described later. The threaded portion 3A is extended to the tip side, and the threaded portion 3A is set to a length that projects from the through hole 4a of the washer 4 into the insertion hole 1 of the fastening surface a. If 3A is designed so that it can be screwed into the screw rod 2 in the insertion hole 1 of the tightening surface a, it is not necessary to project the screw rod 2 from the tightening surface a. 3 can be easily designed and realized so that it can be screwed in with a sufficient allowance (screwing amount). So that the suppressed reliably reduce the protrusion of the tip of the screw rod 2 by drop fit into the through-hole 4a of the washer 4.

  Further, as in the conventional example described above, the type in which the washer part is integrally formed with a part of the nut has problems in terms of mass productivity, cost, and dimensional diversity, but the structure of the washer 4 of the present invention is as follows. It is a simple structure that simply sets the through hole 4a in the center of the washer 4 to a hole shape having a tapered portion 6, and for example, presses with different areas and thicknesses depending on the required tensile strength, etc. It can be designed and realized easily, and there is no worry that the mass productivity and the cost will be remarkably increased.

  Specific embodiments of the present invention will be described with reference to the drawings.

  In this embodiment, the washer 4 is brought into contact with the fastening surface a by the screwing member 3 which is brought into contact with the screw rod 2 inserted into the insertion hole 1 formed in the fastening surface a. The present invention is applied to a tightening structure for tightening and pressing the tightening surface a, and as shown in the drawing, the present invention is applied as a tightening structure in a building member connecting structure for fixing and connecting building members. Specifically, a connecting bolt 杆 such as an anchor bolt standing on a building member is the screw 杆 2, and the surface of the other building member having a bolt through hole through which the screw 杆 2 is inserted, Alternatively, the bottom surface of the counterbored groove 7 provided in the surface of the other building member is the fastening surface a, and the bolt through-hole formed in the fastening surface a is configured as the insertion hole 1. The screw rod 2 erected on the one building member is inserted into the insertion hole 1 of the other building member, and the screw member 3 screwed to the screw rod 2 is tightened via the washer 4. The building members are fastened and fixedly connected to the surface a.

  In the illustrated embodiment, as shown in FIGS. 2 to 4, an anchor bolt standing on a concrete foundation is used as the screw rod 2, and the screw rod 2 (anchor is attached to a wooden base placed horizontally on the concrete foundation. The insertion hole 1 (bolt hole) through which the bolt) is inserted is formed, and a counterbored groove 7 is formed in a portion of the base communicating with the insertion hole 1, and the bottom surface of the counterbored groove 7 is formed on the washer 4. It is configured as the fastening surface a that fastens the screwing member 3 via the screw, and the concrete foundation and the base are fastened and fixedly connected. For example, it may be adopted for the fastening connection between the vertical columns.

  Hereinafter, the present embodiment will be specifically described.

  In the tightening structure of this embodiment, a through hole 4a is formed in the center of the washer 4, and the through hole 4a is on the pressing surface side of the washer 4 that contacts the tightening surface a (on the lower surface side in FIG. 1). Hereinafter, it is set to a hole shape having a tapered portion 5 whose diameter is reduced toward the “lower surface side”, the screw member 3 is formed in a cylindrical shape, and the screw rod 2 and screw are formed on the inner peripheral surface thereof. A mating female screw 3a is formed, and the outer peripheral surface is formed into a shape having a tapered portion 6 that matches the tapered portion 5 of the central through hole 4a of the washer 4, and this screw member 3 is formed into the screw rod 2 When the screw member 3 is screwed and tightened and rotated, the screw member 3 is moved to the through hole 4a to a position where the taper portion 5 of the through hole 4a of the washer 4 and the taper portion 6 of the screw member 3 come into contact with each other. The washer 4 is configured to be depressed and inserted into the inside to be pressed against the fastening surface a.

  The washer 4 is formed with the through hole 4a in the center, and as shown in FIG. 1, the upper surface portion and the lower surface portion are formed on a flat end surface. Further, the tapered portion 5 of the through-hole 4a may be formed in a tapered shape that gradually decreases in diameter in, for example, a multi-stage shape. However, in the illustrated embodiment, it continuously extends toward the lower surface side of the washer 4. It is formed in a conical taper shape with a reduced diameter. As shown in FIGS. 1 and 2, the conical taper tapered portion 5 is formed from the upper opening edge of the through hole 4a toward the lower surface side, and the tapered portion 5 of the through hole 4a is formed. The range from the tip of the wire to the lower opening edge is formed as a straight hole with a constant diameter. That is, the tapered portion 5 is formed in the upper part of the through hole 4a of the washer 4, and the lower part is formed in a straight hole having a constant diameter.

  If the upper part of the through hole 4a of the washer 4 is formed as a straight hole and the tapered portion 5 is formed in the lower part, or if the entire range from the upper opening edge to the lower opening edge of the through hole 4a is assumed. When the tapered portion 5 is used, there is a concern that the washer 4 becomes extremely thin at the tip of the tapered portion 5 and a problem in strength occurs. However, when the tapered portion 5 is formed in the upper portion of the through hole 4a and the lower portion is a straight hole as in this embodiment, the washer 4 is not made extremely thin at the tip of the tapered portion 5. It will end.

  The washer 4 is formed by pressing a metal member.

  On the other hand, the tapered portion 6 on the outer peripheral surface of the screwing member 3 that is in abutting contact with the tapered portion 5 of the through hole 4a of the washer 4 is similarly penetrated by the washer 4 as shown in FIGS. It is formed in a conical taper shape that matches the tapered portion 5 of the hole 4a.

  The tapered portion 5 of the through-hole 4a of the washer 4 and the tapered portion 6 of the screw member 3 may have a multi-stage shape with a reduced diameter, but as shown in this embodiment, In the case of a conical taper shape with a reduced diameter, the washer 4 can receive the tightening pressure of the screwing member 3 in a wider range and can be tightened more firmly.

  Further, as shown in FIGS. 1 and 2, the screw member 3 is formed with a female screw 3 a on the inner peripheral surface, and a base end of a screwed portion 3 </ b> A that can be screwed onto the screw rod 2. On the side, a head 3B having a diameter larger than the threaded portion 3A and having the tapered portion 6 on the outer peripheral surface is provided.

  Further, as shown in FIGS. 1 and 2, the head 3B is formed in a hexagonal shape similar to a normal nut that can be screwed and rotated by a tool such as a wrench on the base end side. It has a shape having the tapered portion 6 at the tip from the part.

  Further, as shown in FIG. 1, the screwing portion 3A of the screwing member 3 can be inserted through the through hole 4a of the washer 4 and is screwed into the screw rod 2 so that the screw rod 2 The diameter was set such that the screw rod 2 could be screwed into a gap between the tightening surface a through which the screw rod 2 was inserted. Then, the threaded portion 3A of the screw member 3 is inserted through the through hole 4a of the washer 4, and the tapered portion 5 of the through hole 4a of the washer 4 and the head portion 3B of the screw member 3 are tapered. As shown in FIGS. 1 and 3, when the screw member 3 is lowered and fitted into the through hole 4a to the position where the portion 6 is in abutting contact, the screw member 3 is moved downward from the through hole 4a as shown in FIGS. The length dimension of the screw part 3A of the screw member 3 is set so that the screw part 3A protrudes.

  That is, the screw member 3 does not have to be set to such a length that the tip of the screw rod 2 protrudes from the inside of the insertion hole 1 of the building member (base) to the tightening surface a (the bottom surface of the counterbored groove 7). 3A is set to a length that projects into the insertion hole 1, and when tightening, as shown in FIGS. 1 and 4, the threaded portion 3A at the tip of the screw member 3 is inserted. The length dimension of the screwing portion 3A of the screwing member 3 is set so as to be screwed into the insertion hole 1 while being screwed into the screw rod 2 in the hole 1.

Therefore, it is not necessary to project the tip of the screw rod 2 from the tightening surface a by a predetermined length (at least from the through hole 4a of the washer 4 to the upper surface side of the washer 4) as in the prior art. 2
The protrusion length of the screw rod 2 from the tightening surface a is naturally changed due to an error during the construction, so that it can be screwed well with the screw member 3 ( There is no trouble that the screw cannot be screwed with a sufficient amount of allowance, and the screw portion 3A at the tip of the screw member 3 is securely screwed into the screw rod 2 and screwed into the screw rod 2. The member 3 can be securely and firmly screwed.

  Hereinafter, an example of a tightening work procedure in the wood connection structure of the present embodiment will be described.

  As shown in FIG. 2, a screw rod 2 (anchor bolt) standing upright from the concrete foundation is inserted into the insertion hole 1 of the base as shown in FIG.

  The washer 4 may be previously placed in contact with the bottom surface of the counterbored groove 7 which is the fastening surface a, or the tip of the screw member 3 is inserted into the through hole 4a of the washer 4 as shown in FIG. The screw portion 3A may be inserted into the fastening surface a, and in any case, the screw portion 3A at the tip of the screw member 3 is inserted into the through hole 4a of the washer 4. After that, the screwing portion 3A is screwed into the screw rod 2.

  Then, the screwing member 3 is tightened and screwed, and the screwing portion 3A screwed into the screw rod 2 is screwed into the insertion hole 1 and inserted.

  At this time, the screw member 3 does not abut on the flat upper surface of the washer 4 in a superposed state, but is screwed with the tapered portion 5 of the through hole 4a of the washer 4 as shown in FIGS. The through-hole 4a is inserted into the through hole 4a until it comes into contact with the tapered portion 6 on the outer periphery of the head 3B of the attachment member 3, and the washer 4 is clamped and pressed against the fastening surface a at the position where the insertion is made. It will be.

  Thereby, the foundation can be fastened and fixedly connected to the concrete foundation.

  Further, as shown in FIG. 1, the screwing member 3 falls and fits into the through hole 4a of the washer 4 as described above rather than simply being placed and polymerized on the flat upper surface of the washer 4. The amount of protrusion of the screwing member 3 from a can be reliably reduced as compared with the conventional case.

  Further, the screwing portion 3A at the tip of the screwing member 3 is screwed into the insertion hole 1 while being screwed onto the screw rod 2, and has a sufficient allowance in the long range with the screw rod 2 in the insertion hole 1. Since it is firmly fixed by screwing, the concrete foundation and the foundation can be firmly tightened and fixed.

  5 and 6 show another example of the present embodiment. Specifically, the base member 3B has a hexagonal shape on the proximal end side of the head 3B of the screw member 3 and has a tapered portion 6 on the distal end side. Instead, this is another example in which the entire outer periphery of the head portion 3B is formed in a tapered portion 6 having a conical taper shape. The head 3B is formed with a hexagonal hole 8 that communicates with a hole in which the female screw 3a of the screwing portion 3A at the tip of the screwing member 3 is formed. A hexagonal bar spanner is inserted into the hexagonal hole 8. It is another example comprised so that it could be screwed and fitted.

  Further, when the hexagonal hole 8 is formed in the head 3B of the screw member 3 as described above, the washer 4 penetrates the hexagonal outer periphery of the head 3B of the screw member 3 as shown in FIG. There is no need to project from the hole 4a, and the entire head portion 3B of the screw member 3 can be inserted into the through hole 4a of the washer 4 so that it can be screwed well with a screw tool. The protruding amount of the member 3 can be suppressed, or the thickness of the washer 4 can be set thick.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

It is an explanatory front sectional view of a tightening structure according to the present embodiment. It is explanatory perspective view which shows the example of a fastening operation | movement procedure of a present Example. It is explanatory perspective view which shows the example of a fastening operation | movement procedure of a present Example. It is explanatory perspective view which shows the example of a fastening operation | movement procedure of a present Example. It is a description perspective view which shows another example of a present Example. It is explanatory front sectional drawing which shows another example of a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insertion hole 2 Screw rod 3 Screwing member 3A Screwing part 3B Head 3a Female screw 4 Washer 4a Through-hole 5 Tapered part 6 Tapered part 7 Counterbore groove a Fastening surface

Claims (5)

  In the tightening structure in which the washer is brought into contact with the tightening surface, and the washer is tightened and pressed against the tightening surface by a screw member that is screwed into a screw rod that is inserted and disposed in an insertion hole formed in the tightening surface. A through hole is formed in the center of the washer, and the through hole is set to a hole shape having a tapered portion that is reduced in diameter toward the pressing surface side of the washer that contacts the fastening surface. The inner peripheral surface is formed with a female screw that is screwed with the screw rod, and the outer peripheral surface is formed into a shape having a tapered portion that matches the tapered portion of the central through hole of the washer, When the screwing member is screwed onto the screw rod and tightened and rotated, the screwing member passes through the penetrating portion until the tapered portion of the through-hole of the washer and the taper-shaped portion of the screwing member abut against each other. So that the washer fits into the hole and is pressed against the clamping surface. Tightening structure wherein the structure was.   The tapered portion of the through hole of the washer is formed in a conical taper shape that continuously decreases in diameter toward the pressing surface side of the washer that contacts the fastening surface, and the tapered portion of the outer peripheral surface of the screw member The fastening structure according to claim 1, wherein the fastening structure is formed in a conical taper shape that matches the tapered portion of the through hole of the washer.   The screw member is formed at the proximal end of a screwed portion that can be screwed onto the screw rod by forming the female screw on the inner peripheral surface, and is tapered on the outer peripheral surface with a diameter larger than that of the screwed portion. The screw member of the screw member can be inserted into the through hole of the washer and is screwed into the screw rod so that the screw rod and the screw rod are fitted. The fastening structure according to any one of claims 1 and 2, characterized in that the diameter is set so as to be screwed into a gap between the fastening surface and the insertion hole.   The threaded portion of the threaded member is inserted through the through hole of the washer, and the threaded member is moved to a position where the tapered portion of the through hole of the washer and the tapered portion of the head of the threaded member are in contact with each other. The length dimension of the screwing portion of the screwing member is set so that the tip of the screwing portion of the screwing member protrudes downward from the through hole when the screw is inserted into the through hole. The fastening structure according to claim 3.   A connecting bolt の such as an anchor bolt standing upright on the building member is the screw 杆, and the surface of the other building member through which the bolt through hole for inserting the screw 杆 is formed, or the other building member. The bottom surface of the counterbored groove formed in the surface of the screw is used as the tightening surface, and the bolt hole formed in the tightening surface is configured as the insertion hole, and the screw rod is erected on the one building member. As a tightening structure in which the building member is fastened and connected to the fastening surface by tightening the screwing member inserted into the insertion hole of the other building member and screwed into the screw rod to the fastening surface via the washer. The building member connecting structure using the fastening structure according to any one of claims 1 to 4.

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