JP2007327308A - Tightening fixture and fixing method for wooden intersecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain fastening stability and high efficiency by arranging a joining screw rod always parallel or right-angled to each member even when the members are joined inclining, and applying only axial force to the screw rod. <P>SOLUTION: This tightening fixture comprises a first screw rod 8 screwed to a first cylinder nut 7, a nut holder 9, a second cylinder nut 10 and a second screw rod 11. The nut holder 9 is arranged in a recess provided in a joint part 14 between a first member 3 and a second member 5. The nut holder 9 is provided with a nut receiving hole penetrating the center part and fittingly inserting and supporting the second cylinder nut 10 turnably; a rod insertion hole intersecting the nut receiving hole; and an inclined groove formed at a part in the open edge of the rod insertion hole to allow tilting of the second screw rod 11 around the second cylinder nut 10. A wooden intersecting structure can be tightened coping with an angle at each time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tightening fixture and a fixing method for a wooden cross structure, and more specifically, for example, three members of a column, a girder mounted on the column and a horizontally extending girder, and a climbing beam mounted obliquely crossing the column. The present invention relates to an architectural bracket for fixing and a method for fixing the same.

  When a wooden structure is assembled with columns and beams, mortises and mortise holes are formed and fitted to the joints. And the joining site | part is reinforced by using a metal fitting suitably. In addition, joining is often performed by embedding hardware, and the strength is often improved. For example, as shown in the upper half of FIG. 18, the screw rod 44 is formed by forming longitudinal holes 42 a and 43 a extending in the longitudinal direction in the two structural members 42 and 43 that are opposed to each other with the column 41 interposed therebetween. Through, the square holes 42b, 43b are carved at positions corresponding to the screw ends to secure the accommodation space for the nuts 45, 46, or slits are formed in both members as disclosed in, for example, JP-A-11-315610. Each plate surface of the bracket that straddles is fitted, and both members are bolted through this. However, in any case, as a result of requiring a space for housing the hardware, a cross-sectional defect occurs, and the yield strength of the member cannot be avoided. If the nut housing position is shallowed in order to reduce the cross-sectional defects due to the above-described square holes 42b, 43b, etc., the securing force is biased.

  As an example in which cross-sectional defects are reduced as much as possible and the fastening hardware is positioned at the center of the member to increase the securing force and avoid the generation of unnecessary moments, Japanese Utility Model Publication No. 59-3044 and There is a binding metal described in Kai 2000-170251. As shown in the lower half of FIG. 18, a hole 47a is formed in one member 47 of the members 41 and 47 intersecting with the T shape at a position slightly away from the joint. A cylinder nut 48 having a screw hole 48a formed in the middle is fitted. A screw rod 49 crossing the other member 41 in the width direction passes through the central portion of the one member 47, and the tip of the member is screwed into the screw hole 48a to join the two members with high strength.

  By the way, not only when a structural member intersects at right angles, but also there is a case where the end of another member must abut against the inclined surface of the inclined member. FIG. 17A shows an example in which the fastener comprising the cylinder nut 48 and the threaded rod 49 with the head 49a is applied to a structure in which the beam 52 is abutted against the beam 51 in the “I” -shaped arrangement. It is. A cylinder nut 48 is inserted into a hole 52a provided in the beam 52, and the screw rod 49 passes through the center of the beam. On the other hand, in the case of the beam 51, the screw rod 49 is inserted from the center in the width direction when viewed in plan, but the beam is in an oblique state as viewed from the side as shown in the drawing. Needless to say, in the girder 52, only an axial force acts along the longitudinal direction, but the force that presses the mating surface 53 of the beam 51 and the girder 52 becomes a cosine component of the inclination angle, and some of the fastening force is deviated. . On the other hand, the sine component exerts an unnecessary bending force on the screw rod 49.

In addition, if the head 49a formed at the base end of the screw rod 49 is prevented from coming out of the seating portion of the beam 51, the engraving 51a for the washer 54 is required. Needless to say, the greater the angle of the beam relative to the beam, the deeper it becomes, and eventually there are cross-sectional defects that cannot be ignored. Such a thing also occurs in the structure shown in FIG. In this example, a climbing beam 63 is fixed to a girder 62 placed on a pillar 61. Since the area of the overlapping surface 64 is halved, the surface pressure acting thereon is doubled, and in order to secure the fastening force, it is necessary to introduce an oversized member.
Japanese Utility Model Publication No.59-3044 JP 11-315610 A JP 2000-170251 A

  The present invention has been made in view of the above-described problems. The purpose of the present invention is to provide a screw rod for joining that is always parallel or perpendicular to each member even when the members are joined at an angle. By doing so, only the axial force acts on the screw rod, so that the fastening can be stabilized and the efficiency can be improved, and the member of the appropriate strength can be introduced without causing unnecessary bending to the screw rod. It is another object of the present invention to provide a tightening fixture and a fixing method for a wooden cross structure that realizes a reduction in cross-sectional defects due to the presence of metal fittings as much as possible.

  The present invention uses a cylinder nut having a threaded hole extending so as to traverse a second member that is in contact with the end of the first member at an intermediate portion in the longitudinal direction of the cylinder, and a screw rod that is screwed to the cylinder nut. The present invention is applied to a fastening metal fitting fixed to a first member. With reference to FIG. 1, the characteristic feature includes a first screw rod 8, a nut holder 9, a second cylinder nut 10, and a second screw rod 11 that are screwed onto the first cylinder nut 7. The first screw rod 8 has a longitudinal direction from the joint portion 14 of the first member 3 and the second member 5 to the center portion of the first member so that the tip end side is screwed into the fastening screw hole 7a of the first cylinder nut 7. 2 has a head 8a (see FIG. 2) in which a rotation operation portion 15 is formed. The nut holder 9 is disposed in the recesses 2 h and 4 h (see FIG. 5A) facing each other facing the joining portion 14 between the first member 3 and the second member 5. The second cylinder nut 10 is provided with a fixing screw hole 17 (see FIG. 3A) in which an end portion of the second screw rod 11 is screwed in an intermediate portion. The second screw rod 11 is disposed in a transverse hole 4a (see FIG. 5A) that crosses the second member 5 at a right angle, and the distal end side is positioned at the joining portion 14 and the proximal end side is rotated. It has a head 11a formed with a portion 16 (see also FIG. 11B). As shown in FIG. 4, the nut holder 9 has a nut receiving hole 19 that penetrates the center portion and rotatably supports the second cylinder nut 10 (see FIG. 3A). The rod insertion hole 20 orthogonal to the nut receiving hole 19 and a part of the opening edge of the rod insertion hole 20 are formed on the second cylinder nut 10 of the second screw rod 11 (see FIG. 10B). ) And a fitting seat 22 for fixing the head 8a (see FIG. 7A) of the first screw rod 8 reaching the bottom of the rod insertion hole 20. It is formed. The opening 20a of the rod insertion hole 20 has such a size that the tip portion of the second screw rod 11 reaches the fixing screw hole 17 and the head 8a of the first screw rod 8 passes therethrough.

  The nut holder 9 has a substantially spherical shape, and each of the recesses 2h and 4h provided in the joint portion 14 between the first member 3 and the second member 5 accommodates the nut holder 9 as shown in FIG. It can be hemispherical.

  The nut holder 9M may be cylindrical as shown in FIG. 16, and each recess provided in the joint portion 14 between the first member 3 and the second member 5 can accommodate the nut holder 9M. A space including a semi-cylindrical shape may be used.

  As shown in FIG. 2, the first screw rod 8 includes a screw bar 8A and a screw cap 8B covering the base end side thereof, and a rotation operation unit 15 is formed on the top of the screw cap 8B. The screw bar 8A and the screw cap 8B are screwed together so that at least one of the screw threads is limited so as to reach the screw end of the cap or bar, so that the screw cap 8B and the screw bar 8A or more. Is prevented from increasing (see FIG. 6B).

  The second screw rod 11 includes a screw bar 11A and a screw cap 11B covering the base end side thereof, and a rotation operation unit 16 is formed on the top of the screw cap 11B. Even if the screw cap 11B is rotated, the screw bar 11A and the screw hole 17 for fixing are screwed to at least either one of the screw bars or the screw end of the screw hole. Further increase in the amount of screwing between the screw bar 11A and the fixing screw hole 17 of the second cylinder nut 10 is prevented (see FIG. 10B).

  In the tightening and fixing method of the wooden cross structure, when the first screw rod 8 in the tightening fixture 6 is screwed, as shown in FIG. After fixing the head 8a of the single screw rod 8, the second cylinder nut 10 is inserted into the nut receiving hole 19 as shown in FIG. 7B, and then fixed as shown in FIG. 8B. It is made to rotate with the rotation operation tool 24 inserted in the rotation operation part 15 through the screw hole 17 for an operation.

  According to the present invention, the metal tightening fixture includes a first cylinder nut, a first screw rod, a second cylinder nut, a nut holder, and a second screw rod, and the first screw rod is screwed into the first cylinder nut. The nut holder is firmly fixed to the joint of the first member, and the second screw rod is engaged with the second cylinder nut that can be rotated in the nut holder, and transmits the force to sandwich the second member. The second member is securely and firmly fixed to the first member.

  Since both the first screw rod and the second screw rod are disposed at the central portions of the first member and the second member, the force generated by each screw rod is most effectively transmitted to the first member and the second member. There is no bias in the transmission of force, and there is no need to give excessive strength to both the first member and the second member. Since bending does not act on each threaded rod, excessive strength is not required for the threaded rod. In general, high-efficiency transmission and low cost of force in the structure can be achieved. Since the surface area of the recess formed for the nut holder is larger than the projected area, the surface pressure load at the cross-sectional defect portion is reduced, and the influence of the cross-sectional defect can be reduced with respect to the amount of hollowing out.

  The nut holder rotatably supports the second cylinder nut, and an inclined groove is provided at a part of the opening edge of the rod insertion hole, so the angle of the second screw rod can be easily adjusted to the installation angle of the second member as needed. be able to. Therefore, the second member can be applied to structures having different inclination angles with respect to the first member, and a versatile tightening fixture can be obtained. In any case, the metal fitting can be accommodated in the structural member and attached, so that the appearance of the wooden cross structure is not impaired and the attachment of other members is not obstructed.

  If the nut holder has a substantially spherical shape, it will occupy an extremely compact volume, and the cross-sectional defects produced by the hemispherical recesses formed in the first member and the second member can be minimized. Since the surface area of the dent is twice the projected area, the degree of stress generated in that part by fastening will be halved and dispersed, and the dent with no inner corner will eliminate stress concentration and structure The burden on the material is reduced. Even when the nut holder is cylindrical, it occupies less volume than in the case of a spherical shape, the surface of the dent can be secured about 1.6 times the projected area, and the surface pressure generated in that part is also reduced. Will be.

  If the first screw rod is composed of a screw bar and a screw cap covering the base end side, a commercially available product can be used as the screw bar, and the cost can be reduced. Even if the part to which the tightening fixture is applied or the size of the wooden cross structure is different, it can be handled by replacing only the commercially available part with another product, and there is no need to change the specific part of this tightening fixture. It becomes a high quality thing. Since the rotation operation hole is formed at the top of the screw cap, it is possible to save the trouble of forming the rotation operation portion on the commercially available screw bar.

  If the number of screw threads is limited so that the screw bar and screw cap can be screwed to the screw end of the cap or bar, the amount of screw engagement between the screw cap and screw bar will increase further. And the subsequent rotation of the screw cap causes the screw bar to co-rotate and smoothen the screw bar with the first cylinder nut.

  If the second screw rod is also constituted by a screw bar and a screw cap covering the base end side, a commercial product can be used as the screw bar as in the case of the first screw rod. Moreover, since the rotation operation part is formed on the top part of the screw cap, it is not necessary to process the commercial screw bar each time.

  If at least one of the screw threads is limited so that the screw bar and the fixing screw hole can be screwed to the screw end of the bar or screw hole, the screw bar can be locked to the fixing screw hole. After that, the screw cap is turned to achieve screwing with the screw bar, whereby the second member 5 can be strongly tightened.

  In the method of tightening and fixing a wooden cross structure, the head of the first screw rod is fastened to the fitting seat of the nut holder, the second cylinder nut is inserted into the nut receiving hole, and then passed through the fixing screw hole to the rotating operation part. Since the rotary operation tool is inserted and rotated, the first screw rod is screwed into the first cylinder nut, and the nut holder is secured to the first member while the second cylinder nut is attached to the nut holder. can do. Since the second cylinder nut is mounted before the nut holder is secured to the first member, the second cylinder nut that fixes the second member to the overlapping surface can be provided.

  Below, the tightening fixture of the wooden crossing structure which concerns on this invention is demonstrated in detail based on drawing which represented embodiment with the method to fix the same. FIG. 1 shows a first member 3 consisting of a wooden column 1 and a wooden girder 2 extending horizontally on the column 1 for fixing a second member 5 such as a wooden climbing beam 4 and a corner tree, which are stacked in an inclined manner. This shows a mounting state of the tightening bracket 6. According to this metal fitting, even when the second member 5 is inclined and joined to the first member 3 as shown in FIG. Will always be parallel or perpendicular to. Therefore, only the axial force acts on each screw rod for fastening, and the cross-sectional defect of the structural material can be made as small as possible without receiving unnecessary bending.

  The outline of the metal fitting 6 is composed of a first cylinder nut 7, a first screw rod 8, a nut holder 9, a second cylinder nut 10 in the nut holder, and a second screw rod 11 from the bottom of the figure. . Of particular note in this example is the structure of the second cylinder nut 10 and the nut holder 9 containing it, and its combination mechanism.

  Here, the tightening and fixing of the wooden cross structure composed of the first member 3 and the second member 5 by metal fittings will be briefly described, and details will be described later. First, the first cylinder nut 7 is embedded in the column 1 of the first member 3, and after the first screw rod 8 is inserted from above the nut holder 9, the second cylinder nut 10 is inserted into the nut holder 9 from the side. Is done. When the first screw rod 8 is threaded through the first member 3 up to the first cylinder nut 7, the nut holder 9 is the top surface of the girder 2 that is the top of the first member 3 (an overlapping surface 14 described later). Fixed to. The climbing beam 4 is placed so as to cover the nut holder 9, and the climbing beam 4 is fixed to the nut holder 9 by the second screw rod 11 screwed into the second cylinder nut 10 in the nut holder 9. The second member 5 is strongly fixed to the first member 3 via the intermediate member.

  Each component will be described in detail. In this example, a horizontally extending girder 2 is passed over the column 1, but a tenon 12 formed on the top of the column is fitted in a tenon hole 13 provided in the column 2. Note that the first screw rod 8 firmly tightens the column 1 and the girder 2 in a state where the tenon 12 is also vertically passed. The first cylinder nut 7 described above is embedded in a transverse hole 1b that horizontally traverses the column in the vicinity of the bottom of the long hole 1a passing through the central portion of the column 1 in the longitudinal direction. This is provided with a fastening screw hole 7a extending in the radial direction at an intermediate portion thereof.

  The above-described first screw rod 8 is formed so that the front end side of the first screw rod 8 is screwed into the fastening screw hole 7a. The inside of the vertical hole 3a of the 1st member 3 which consists of 1a is extended toward the bottom. A wrench hole which is a rotation operation unit 15 is formed in the head 8a (see FIG. 2) formed on the base end side. In this example, the first threaded rod 8 is composed of a screw bar 8A and a screw cap 8B having a wrench hole 15 at the top of the screw bar 8A.

As shown in FIG. 6B, the screw bar and the screw cap are screwed up to the screw end of the cap or bar, and further increase in the screwing amount between the screw cap 8B and the screw bar 8A is prevented. It is considered to be. That is, in the example shown, the screw 8A _a screw bar. 8A is threaded number so as to be shorter than thread depth of the screw hole 8B _a cap 8B is limited, thus, at least one of the threads If the number is limited, the forward rotation of the screw cap 8B always causes the screw bar 8A to rotate together, and the screw bar is engaged with the first cylinder nut 7 (see FIG. 8B). Make it smooth.

  Returning to FIG. 1, the second threaded rod 11 is disposed so as to cross the second member 5 at a right angle, that is, to be orthogonal to the direction in which the climbing beam 4 extends, and the distal end side is located at the joining site 14. And the base end side becomes the head 11a which has the wrench hole 16 as a rotation operation part in the top part. As can be seen from FIG. 2, this threaded rod is also composed of a screw bar 11A and a screw cap 11B having a wrench hole 16 at the top of the screw bar 11A. Note that the screw bar 11A is given shorter than the thickness of the climbing beam 4 because of the use of the screw cap (see FIG. 11B described later).

The second cylinder nut 10 is provided with a fixing screw hole 17 into which the tip of the second screw rod is screwed so as to extend in the radial direction at an intermediate portion (see (a) to (d) of FIG. 3). The fixing screw hole 17 and the screw bar 11A are screwed to the fixing screw hole 17 or the screw end of the screw bar 11A as shown in FIG. Increase in volume is prevented. That is, in the example shown, the thread number to be less than the length of the screw 11A _a valid screw screw bar 11A of the fixing screw hole 17 is restricted, thus, at least one of the screws If the number of ridges is limited, the screw bar 11A can be locked in the fixing screw hole 17, and the screw bar 11A does not rotate together even if the screw cap 11B is turned and then rotated. Only the screwing with the bar proceeds and the second member 5 can be strongly fixed to the first member 3.

  As shown in FIG. 11B described later, the nut holder 9 is disposed on the overlapping surface 14 of the beam 2 as the first member 3 and the climbing beam 4 as the second member 5. That is, the recesses 2h and 4h are provided in each of the first member and the second member so as to face each other at the joining portion 14, and these are hemispherical as shown in FIG. The entire nut holder 9 can be fitted.

Thus, if it is made into a substantially spherical shape, it will occupy a very compact volume, and the cross-sectional defect | deletion which arises in the dent formed in the girder 2 and the climbing beam 4 can be minimized. Because the surface area of the indentation is also twice the projected area ^{(4πR 2/2 / πR 2} = 2.0: R the radius of a sphere), stresses generated in the portion by the fastening to be halved and dispersed become. A dent without an inner corner eliminates stress concentration and greatly reduces the burden on the structural material.

As shown in FIG. 4, the nut holder 9 is formed with a nut receiving hole 19, a rod insertion hole 20, an inclined groove 21, and a fitting seat 22. The nut receiving hole 19 has an axis 19a (see FIG. 1) parallel to the horizontal beam 2 and passes through the center of the nut holder 9, and supports the second cylinder nut 10 by being rotatably inserted. (See (a) of FIG. 3). Rod insertion hole 20 is perpendicular to the nut-receiving hole 19 as shown in FIG. 4 (c), to reach the screws 11A _a tip of the second screw rod 11 to the fixing screw holes 17 (shown in FIG. 9 (b) And an opening 20a through which the head 8a of the first screw rod 8 passes (see (a) of FIG. 7).

  The inclined groove 21 is formed at a part of the opening edge of the rod insertion hole 20 as shown in FIG. 4A, and the second cylinder of the second screw rod 11 as shown in FIG. 10B. This is provided to allow tilting around the nut 10. The angle α of the inclined groove 21 is given, for example, up to about 45 degrees, and a margin for adjusting the screw bar 11A so as to be orthogonal to the inclination of the climbing beam 4 is provided. Since the inclined groove is provided in this way and the second cylinder nut 10 is rotatable, not only can the angle of the second screw rod be easily adjusted to the installation angle of the second member, but also the second member. This can be applied to structures having different inclination angles with respect to the first member, and is a versatile tightening fixture.

  The fitting seat 22 shown in FIGS. 4B and 4C is for fixing the head 8a formed on the base end side of the first screw rod 8 as shown in FIG. 7A. , Formed at the bottom of the rod insertion hole 20. That is, when the head 8a of the screw cap 8B arrives after passing through the screw bar 8A, the hole is sized to prevent further passage, and the periphery of the hole forms a seating surface that matches the shape under the head. is doing.

  The wooden cross structure tightening fixture having such a configuration can fix the second member 5 to the first member 3 as follows. As shown in FIG. 5A, each member is previously provided with a transverse hole 1b and recesses 2h and 4h, and the processing of the recess will be described later. As shown in FIG. 5B, the first cylinder nut 7 is inserted into the transverse hole 1 b provided near the bottom of the long hole 1 a of the column 1. When there is an index slit 23 for teaching the direction of the hole formed in the end face as shown in FIG. 5C so that the fastening screw hole 7a provided in the hole coincides with the direction of the long hole 1a, Keep it.

  Meanwhile, as shown in FIGS. 6A and 6B, the screw cap 8B is put on the screw bar 8A. Since either one of the screws is short, when the screw is screwed to the end of the short screw, the screw cap is integrated with the screw bar, and the length of the first screw rod 8 as shown in FIG. L8 is defined. In addition, the column 2 is integrated with the column 1 so that the tenon 12 is fitted into the tenon hole 13 as shown in FIG.

  The first screw rod 8 is passed through the rod insertion hole 20 of the nut holder 9 (see FIG. 6B). The screw bar 8A passes through the hole formed in the fitting seat 22, but the head 8a of the screw cap 8B stops when it reaches the fitting seat 22 (see FIG. 7A). In this state, the second cylinder nut 10 is inserted into the nut receiving hole 19 of the nut holder 9 according to the procedure of FIG. At this time, the fixing screw hole 17 of the cylinder nut 10 is set to be vertical. As shown in FIG. 7C, the first screw rod 8 combined with the nut holder 9 is placed in an almost stationary state by the head 8 a that is prevented from being pulled upward by the second cylinder nut 10.

When the first screw rod 8, the nut holder 9, and the second cylinder nut 10 are integrally assembled in this way, this is inserted into the beam 2 and the column 1 as the first member 3 as shown in FIG. Is done. The operation can be performed very easily if the second cylinder nut 10 is lightly pressed from the left and right with fingers or the like so as not to come out of the nut holder 9. When integrated set of shape is fitted to the kept by longitudinal hole 3a, the screw 8A _b is facing the opening of the fastening screw holes 7a of the first cylinder nut 7. At this time, since the nut holder 9 is separated from the recess 2h, even if the second cylinder nut 10 is slightly rotated during the above operation, it can be easily corrected. As shown in FIG. 8B, a rotary operation tool such as a hexagon wrench 24 is inserted into the wrench hole 15 through the fixing screw hole 17 of the second cylinder nut 10 and rotated in the direction of the arrow 25 to rotate the first screw rod. the screw 8A _b formed at the tip of 8, screwed into the fastening screw holes 7a of the first cylinder nut 7.

In screwing the screw 8A _b, nut holder 9 is seated on the recess 2h. When tightened, the nut holder 9 is firmly fixed to the top of the first member 3, and the girder 2 is also immovable with respect to the column 1. In such an operation, the nut holder is secured to the first member while the second cylinder nut is mounted on the nut holder. Since the second cylinder nut is mounted before the nut holder is secured to the first member, the second cylinder nut 10 that fixes the second member 5 to the overlapping surface can be provided.

If the wrench 24 is pulled out vertically as shown in FIG. 9A, the fixing screw hole 17 remains vertical. As in Figure 9 the (b), the second threaded screw bar 11A of the rod 11 to face the fixing screw hole 17 has a vertical, threaded portion 17a of the screw 11A _a tip by turning it manually in such Bite deeply. A screw is formed in the fixing screw hole 17 only halfway inside the second cylinder nut 10, and therefore, when the screw end is screwed to the screw end, further screwing of the screw bar 11A is prevented.

  While the climbing beam 4 is hung with a crane and transported to a predetermined position, the washer 26 is fitted to the screw cap 11B shown in FIG. When the climbing beam 4 is lowered, the screw bar 11A is appropriately tilted within the range of the angle α shown in (b), and the upper end thereof is inserted into the transverse hole 4a formed in the climbing beam 4 from below. After that, even if the climbing beam 4 swings to the left or right or the tilt angle slightly changes, the screw bar 11A tilts around the second cylinder nut 10, so that an unreasonable force is not generated on the nut holder 9. .

The climbing beam 4 is lowered, the nut holder 9 is placed in the recess 4h, and the abdominal surface is placed on the overlapping surface 14 to correct the angle. Turning inserted into transverse bore 4a of the screw cap 11B accompanied by washer 26 from the top of the climb beam 4, the screw 11A _b of the screw hole 11B _a the screw bar 11A of the screw cap 11B as shown in (a) of FIG. 11 Bite into. If it tightened over the wrench 24 in the wrench hole 16 of the head 11a, by a threaded 11A screwed _b and the screw hole 11B _a proceeds, fitted to the seat surface 4b formed on the climbing beams 4 circle washer 26 and the nut holder 9, FIG. As shown in FIG. 11B, the climbing beam 4 is strongly clamped.

  As a result, there is no bias in the transmission of force, and there is no need to give excessive strength to both the first member and the second member. A bending moment does not act on each screw rod, and it is not necessary to fill the screw rod with an overstrength product. In general, high-efficiency transmission and low cost of force in the structure can be achieved. Since the surface area of the recess formed for the nut holder is larger than the projected area, the surface pressure load at the cross-sectional defect portion is reduced, and the influence of the cross-sectional defect can be reduced for the amount of hollowing out. .

  As can be seen from the above description, the first threaded rod is screwed into the first cylinder nut and the nut holder is firmly fixed to the overlapping surface which is the opening of the first member, and the second threaded rod is As a result of screwing into the second cylinder nut that can be turned and pinching the second member, the second member is securely and firmly fixed to the first member. Since both the first screw rod and the second screw rod are disposed at the central portions of the first member and the second member, the force generated by each screw rod is most effectively transmitted to the first member and the second member. The metal fittings are mounted in the structural member so that the appearance of the wooden cross structure is not impaired and the attachment of other members is not disturbed.

  Here, processing of the recesses 2h and 4h in the overlapping surface 14 of each member shown in FIG. 5A will be briefly described. For the climbing beam 4, as shown in FIG. 12 (a), a pilot hole 4c is provided in the transverse direction. The drill 27 is a special product and includes a hemispherical file surface 27a, and a lead 27b that fits in the prepared hole is formed at the top of the drill 27. It is rotated in the direction of the arrow 28 by a driving machine (not shown) and is ground until it is completely sunk as shown in (b). When the drill is removed, a recess 4h as shown in (c) is formed, and the transverse hole 4a is opened with a normal drill (not shown) with the lower hole 4c as the center. Finally, as shown in (d), the seating surface 4b is formed by facing the upper end opening.

  For the beam 2 constituting the first member 3, as shown in FIG. 13 (a), a pilot hole 2c is provided in the transverse direction. The drill 27 may be the same as that shown in FIG. 12, and is ground until it is completely sunk as shown in FIG. When the drill is removed, a recess 2h as shown in (c) is formed, and the horizontal hole 2a is opened with the lower hole 2c as the center. Finally, as shown in (d), a part 2d of the upper surface is dropped to form the overlapping surface 14. As can be seen from (e) as seen from the side, the width of the overlapping surface is W14, which is a portion where a part of the abdominal surface of the climbing beam 4 is fitted.

  In the tightening fixture described so far, the first threaded rod 8 is composed of a screw bar 8A and a screw cap 8B covering the base end side thereof. A commercial product can be used as the screw bar, and the cost of the portion can be reduced. Even if the part to which the tightening fixture is applied or the size of the wooden cross structure is different, it is possible to replace the commercially available part with another standard product, and there is no need to change the specific part of the tightening fastener. Therefore, a highly versatile metal fitting can be obtained. Since the wrench hole is formed on the top of the screw cap, it is possible to save time and effort for making the wrench hole on the commercial screw bar. The same applies to the case where the second screw rod 11 is constituted by the screw bar 11A and the screw cap 11B. Needless to say, a hole or groove that can be rotated by another known tool in place of the wrench hole may be formed in the head.

By the way, although both the first screw rod and the second screw rod are composed of a screw bar and a screw cap and an appropriate washer has been described, both screw rods are made as a single product as shown in FIG. It can also be a hybrid product. (A) in FIG. 14 was formed with a single threaded rod 8M including a head 8a forming the wrench hole 15 has a screw 8A _b at the tip to the proximal end, the wrench hole 16 has a screw 11A _a a tip head This is an example in which the first screw rod and the second screw rod described above are constituted by a single screw rod 11M having 11a at the base end.

  FIG. 14B shows an example in which only the second threaded rod is a single threaded rod 11M, the first threaded rod is composed of a screw bar 8A and a screw cap 8B, and FIG. 14C shows only the first threaded rod. In this example, one screw rod 8M is used, and the second screw rod is composed of a screw bar 11A and a screw cap 11B. In the case of (c) in FIG. 14, the climbing beam is fixed by the procedures of (b) in FIG. 9, (a) and (b) in FIG. 10, and (a) and (b) in FIG. The cases of (a) and (b) are different. Since the head 11a of the screw rod 11M has a large flange 29 or a washer 26, the screw rod is screwed onto the second cylinder nut 10 before the climbing beam 4 is placed as shown in FIG. Because it is impossible to keep.

In this case, as shown in FIGS. 15A and 15B, after the nut holder 9 is covered with the climbing beam 4, the screw rod 11M is inserted into the transverse hole 4a. The climbing beam 4 is fixed by the screw 11A _a being screwed through the threaded portion 17a of the fixing screw hole 17 of the second cylinder nut 10. Therefore, the screw stop as shown in FIG. It is not allowed, and the thickness of the climbing beam is planned so that the number of screw threads is not excessive or insufficient, or the entire fixing screw hole 17 is made like the second cylinder nut 10K in FIG. 14 (a). Leave it on the screw.

  In any case, since the climbing beam 4 is covered, it is impossible to visually check whether the direction of the fixing screw hole 17 of the second cylinder nut 10 or 10K is maintained at a desired angle. Therefore, the direction of the hole is confirmed or corrected by inserting a thin bar or the like, or a long temporary screw bar (not shown) exceeding the thickness of the climbing beam is screwed at the stage of FIG. 10 (b). Etc. In the latter case, the direction of the fixing screw hole 17 may be maintained until the climbing beam has been lowered, and the temporary bar may be removed and replaced with the screw rod 11M.

  The nut holder holds the second cylinder nut and is arranged at the joint site, the second cylinder nut is rotatable, the nut holder is formed with an inclined groove, and the second screw rod is the second cylinder nut The climbing beam is always fixed by a threaded rod in an orthogonal posture. The nut holder is preferably spherical, but it may be a cylindrical nut holder 9M as shown in FIG. Although not as large as in the case of a sphere, the occupied volume does not increase, and the contact surface in the recess is about 1.6 times the projected area (πRL / 2RL = π / 2≈1.57: R is the radius of the cylinder, L is The length of the cylinder) and the surface pressure generated in that portion are also reduced. Although the whole shape of the recess for accommodating the nut holder 9M does not work as a semi-cylindrical for the convenience of cutting, the space having a substantially ship bottom shape including the semi-cylindrical shape does not cause a large cross-sectional defect.

  The tightening fixture and the fixing method thereof according to the present invention can also be applied to the structure shown in FIG. In this example, an overlapping surface 14A is formed on the pillar 1, and the climbing beam 4 is placed thereon. It goes without saying that the members are not limited to pillars and climbing beams, and it can be understood from the above description that even if they are composed of two members in this way, and even if they are joined to a T shape, they can be used. I can do it.

The perspective view of the state which applied an example of the clamp fixture concerning this invention to the wooden crossing structure. The exploded block diagram of a fastening fixture. The structure of a 2nd cylinder nut is shown, (a) is a perspective view, (b) is a top view, (c) is a side view, (d) is the III-III sectional view taken on the line in (b). The structure of a nut holder is shown, (a) is a perspective view, (b) is a side view, (c) is a front view. (A) is the combination figure of the wooden crossing structure to which the tightening fixture is applied, (b) is the operation explanatory drawing which mounts the first cylinder nut to the column, (c) is the VV arrow view. (A) And (b) is assembly explanatory drawing of a 1st screw rod, (c) is explanatory drawing of a mode that a girder is mounted on a pillar. (A) thru | or (c) are the assembly procedures of a 1st screw rod, and attachment procedure explanatory drawing to a structure. The attachment procedure figure following FIG. The attachment procedure figure following FIG. The attachment procedure figure following FIG. The attachment procedure figure following FIG. The procedure figure which forms a dent in a climbing beam. The procedure figure which forms a dent in a horizontal girder. The structure explanatory view of the tightening fixture of a different form. Installation explanatory drawing in the case of different forms. Structure explanatory drawing at the time of making a nut holder cylindrical. Prior art example in which two or three members are fastened by one screw rod. Explanatory drawing of the prior example which fastens a cross | intersection site | part with one screw rod.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Wooden pillar, 2 ... Wooden girder, 2h ... Depression, 3 ... First member, 3a ... Vertical hole, 4 ... Climbing beam, 4a ... Cross hole, 4h ... Depression, 5 ... Second member, 6 ... Fastening metal fitting, 7 ... 1st cylinder nut, 7a ... Screw hole for fastening, 8 ... 1st screw rod, 8a ... Head, 8A ... Screw bar, 8B ... Screw cap, 8M ... Screw rod, 9, 9M ... Nut holder, 10, 10K ... second cylinder nut, 11 ... second screw rod, 11a ... head, 11A ... screw bar, 11B ... screw cap, 11M ... screw rod, 14, 14A ... overlapping surface (joining part), 15, 16 ... rotation operation Part (wrench hole), 17 ... fixing screw hole, 17a ... screw part, 19 ... nut receiving hole, 20 ... rod insertion hole, 20a ... opening, 21 ... inclined groove, 22 ... fitting seat, 24 ... hexagon wrench (rotation) Operation tool).

Claims (8)

The first member is formed by using a cylinder nut having a screw hole extending so as to traverse the second member that is inclined and in contact with the end of the first member at an intermediate portion in the longitudinal direction of the cylinder, and a screw rod that is screwed to the cylinder nut. In the tightening bracket that is fixed to the member,
A first cylinder nut embedded in a transverse hole formed in the vicinity of the bottom of a longitudinal hole extending in the longitudinal direction at the central portion of the first member, and having a fastening screw hole at an intermediate portion;
A first screw rod having a head that extends through the longitudinal hole from a joint portion of the first member and the second member to screw the front end side into the fastening screw hole and has a rotary operation portion formed on the base end side. When,
A second screw rod having a head that is disposed in a transverse hole that crosses the second member at a right angle, a distal end side is positioned at the joining portion, and a rotation operation portion is formed on the proximal end side;
A second cylinder nut having a fixing screw hole at an intermediate portion to which a tip portion of the second screw rod is screwed;
A nut holder disposed in a recess provided in each of the first member and the second member so as to face each other at the joining portion, the nut holder penetrating through a central portion and rotating the second cylinder nut A nut receiving hole that is freely inserted and supported, and an opening that is perpendicular to the nut receiving hole and allows the tip portion of the second screw rod to reach the fixing screw hole and pass through the head of the first screw rod A rod insertion hole, an inclined groove formed at a part of the opening edge of the rod insertion hole and allowing tilting around the second cylinder nut of the second threaded rod, and a first reaching the bottom of the rod insertion hole A tightening fixture for a wooden cross structure, wherein a fitting seat for fastening a head of a screw rod is formed.   The nut holder has a substantially spherical shape, and each of the dents provided at a joint portion between the first member and the second member has a hemispherical shape capable of accommodating the nut holder. Item 2. A tightening fixture for a wooden cross structure according to item 1.   The nut holder has a cylindrical shape, and each of the dents provided in the joint portion between the first member and the second member is a space including a semi-columnar shape that can accommodate the nut holder. 2. A tightening fixture for a wooden cross structure according to claim 1 characterized by the above.   The said 1st screw rod is provided with the screw cap which covers a screw bar and the base end side, and the said rotation operation part is formed in the top part of this screw cap, The Claim 1 thru | or 3 characterized by the above-mentioned. A tightening fixture for a wooden cross structure according to any one of the preceding claims.   At least one of the screw threads is limited so that the screw bar and screw cap can be screwed to the screw end of the cap or bar, and further increase in screwing amount between the screw cap and screw bar is prevented. The tightening fixture for a wooden cross structure according to claim 4, wherein the fastener is a wooden cross structure.   The said 2nd screw rod is provided with the screw cap which covers a screw bar and its base end side, and the said rotation operation part is formed in the top part of this screw cap, The Claim 1 thru | or 5 characterized by the above-mentioned. A tightening fixture for a wooden cross structure according to any one of the preceding claims.   At least one of the screw threads is limited so that the screw bar and the fixing screw hole can be screwed to the screw end of the bar or screw hole. The tightening fixture for a wooden cross structure according to claim 6, wherein an increase in the amount of further screwing with the hole is prevented. The screwing of the first threaded rod in the wooden cross structure tightening fixture according to claim 1 causes the head of the first threaded rod to be fastened to the fitting seat of the nut holder and the nut receiving hole to be secondly fastened. A method for tightening and fixing a wooden cross structure, comprising: inserting a cylinder nut and then rotating a rotary operating tool inserted into the rotary operating portion through the fixing screw hole.