JPH06257606A - Turnbuckle body and manufacture thereof - Google Patents

Abstract

PURPOSE:To reduce thickness by connecting right-handed and left-handed female screw members to outer sides of both ends of a body member, and thereby equalizing stress applied at the time of use. CONSTITUTION:In a turnbuckle body, a female screw member 2 on which right- handed female screw is threaded and a female screw member 3 on which a left-handed female screw is threaded are connected on outer sides of both ends of a thin and long body member 1 the barrel member 1 is made up of a pipe which has an even sectional shape in a longitudinal direction. The diameter is preferably not more than double the diameter of bolt. A screw machining part necessitates a length not less than 0.8 time the port diameter of the screw. The material, for which high strength steel such as carbon steel is available, is required to match the materials strength of the body member 1. The female screw members 2, 3 are connected to the outer sides of the both ends of the barrel member 1 by frictional press-fitting. Circular projections having thickness corresponding to the inner thickness of the pipe are preferably provided on the connection surfaces of the female screw members 2, 3, facing to the thickness of the pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turnbuckle barrel and a method for manufacturing the same.

[0002]

2. Description of the Related Art Turnbuckles are widely used in buildings, vehicles and the like. The turnbuckle is composed of one turnbuckle barrel and two turnbuckle bolts. Although various types of turnbuckle barrels have been manufactured so far, the manufacturing method is different for each type. The type and manufacturing method of a conventional turnbuckle barrel will be described with reference to FIGS.
The turnbuckle body shown in FIG. 6 is formed by providing an opening at the center of a cylindrical body member and forming circular heads on the left and right of the body member. A slit is opened in the center by shearing, and the slit is widened to form an opening. 7 is manufactured by the same manufacturing method as that of FIG. 6, but the left and right heads are formed in hexagonal nut shapes. In the structure shown in FIG. 8, two members that are curved in two-part shape are opposed to each other in the longitudinal direction, and the joints are joined by resistance welding. The head is circular. In the structure shown in FIG. 9, upper and lower flat plates are bridged to the left and right heads of a quadrangle arranged at intervals and joined by fillet welding of arc welding or gas welding. There are 16 welding points in total. In FIG. 10, both end portions of the pipe are upset (upset) processed to form a circular head portion.
11 is manufactured by the same manufacturing method as that of FIG. 10 after inserting the insert rings at both ends of the pipe. 10 and 11 have a hole in the center of the pipe.

In both of FIGS. 6, 7, 8 and 10, both heads are smaller than the central part. Then, after molding, female screws of right-hand screw and left-hand screw are respectively cut on both heads. For turnbuckle body, please refer to JISA5541,
It is standardized by US Federal Standard FF-T-791b and the like. Then, as classification from shape,
The one shown in Fig. 10 is called a split frame type, and the one shown in Figs. 10 and 11 is a pipe type. Classified as screw nominals in terms of dimensions, JIS defines M6, M8, M10, M12, M14,
M16 / M18 / M20 / M22 / M24 / M27 / M
30 ・ M33 is standardized. According to the US federal standard, 21 kinds of inch sizes are standardized from 1/4 inch to 4 inches.

The turnbuckle is used in various fields, but here, the surface used in buildings is touched. When used for construction, bolts are screwed into the left and right sides of the turnbuckle body, and battledores are welded to the tips of the bolts. Then, each battledore plate is attached to a gusset plate attached to each corner or the like where the beam and the pillar intersect, and the turnbuckle barrel is turned to apply tension to both bolts. According to JIS, the tension applied to the shaft of the bolt is 49 N / mm ² . To turn the turnbuckle barrel, in the case of the split frame type, insert a rod into the center opening and turn it, or use a hexagonal wrench on both heads to turn it. For the pipe type, insert the rod into the hole made in the center of the turnbuckle body and turn it.

According to JISA 5540, "In the brace design, it is premised that each joint element does not break before the yield of the brace shaft, and it is expected that seismic energy will be absorbed by the plastic elongation of the brace shaft. "The yield strength of the welded part of the turnbuckle bolt shank (cylindrical part) with the battledore is sufficiently higher than the yield strength of the turnbuckle bolt shank." . It is considered that the strength performance required for the turnbuckle cylinder is that the deformation amount is small and the strength is high.

[0006]

As a result of actually using the various turnbuckle barrels and examining them from various angles, it has been found that they have the following drawbacks. 6 and 7, a slit is opened by shearing and the slit is widened to form a central opening. Deformation of elongation progresses at the four corners of the opening portion compared to other portions, and the wall thickness at the four corners becomes smaller. When excessive stress is applied during use, the stress concentrates on the four corners, so there is no choice but to increase the wall thickness of the four corners. As a result, the thickness of other parts also becomes unnecessarily large, resulting in an uneconomical product. Also, from a structural perspective,
6 to 11 are not uniform in cross-sectional shape when viewed in the longitudinal direction except for that shown in FIG. Therefore, stress concentrates on the four corners of the opening as described above. Therefore, even in these cases, the thickness of the other portion must be excessively increased. In addition, the split frame type shown in Figs.
The cross section has an opening at the center and an open portion when viewed all around. Therefore, the internal thread portions of both heads are not evenly stressed on the entire circumference, and the stress is locally biased.

In the pipe type shown in FIG. 10, since the cross section is closed all around, uniform stress is applied all around the female screw portions of both heads. However, both heads need to have a wall thickness for internal thread processing, and for that reason, upset (upset) processing is performed to increase the wall thickness. However, during processing, deformation tends to occur in the length direction, and the wall thickness is unlikely to increase. Then, the wall thickness becomes the smallest at the trough portion of the female screw, and stress concentrates on this portion, so that this portion becomes the weakest. Normally, the length of the internally threaded portion needs to be 0.8 times or more the nominal diameter of the screw, but the internally threaded portion of the turnbuckle barrel has to be made much longer than the bolt diameter for the above reason. According to JIS, the length of the internal thread processing part of the turnbuckle barrel with respect to the bolt diameter is slightly different depending on the size, but both the split frame type and the pipe type specify a value of about 1.5 times or more. The US federal standard defines what is shown in FIG. 9, and the value is larger than JIS and is 1.5 to 2 times or more, although it varies depending on the size.

In order to eliminate the drawbacks of FIG. 10, FIG.
Have been developed and put into practical use. In the structure shown in FIG. 11, the internal thread of the insert ring is made to have a length approximately equal to the diameter of the bolt to eliminate the drawback. But,
When a load is applied in the longitudinal direction during use, the insert ring acts to widen the upset portion in the outer peripheral direction. The only way to prevent the upset portion from expanding is to increase the diameter of the pipe to increase the upset angle, or to increase the wall thickness of the pipe. Therefore, the design is economically disadvantageous. In FIGS. 6, 7, 8 and 10, the female screw portions of both heads are formed by performing drilling and thread cutting after the forming. However, since it is difficult to completely automate these processes, the production efficiency will be significantly reduced.

In the structure shown in FIG. 8, when two of the curved members are butted and the portions to be both heads are resistance-welded in the longitudinal direction, it is easy to deform due to pressure into an elliptical shape having the major axis of the welded portion. For this reason, it is necessary to increase the wall thickness more than necessary so that the entire circumference can be cut during the internal thread processing. The extra thickness makes the design uneconomical.
Further, in the case of a large-sized turnbuckle barrel, the area of the resistance welding portion becomes too large and a large capacity welding machine is required. Therefore, practical application is difficult. In the case of FIG. 9, upper and lower flat plates are joined to the left and right heads by arc or gas welding. There are many welds in 16 places, and it takes too much time to weld. In addition, it is difficult to automatically weld by a robot or the like, and the production efficiency is significantly deteriorated. As described above, the conventional products have various drawbacks. The inventor of the present invention has been able to complete the present invention as a result of continuing research and experiments over many years on how to eliminate such defects all at once. The problem to be solved by the present invention is to make the stress applied during use as uniform as possible over the entire circumference so that the wall thickness can be as small as possible. Therefore, an economical design can be achieved and the strength is high. The present invention is to provide a turnbuckle barrel that is resistant to deformation and a highly productive manufacturing method for producing such a turnbuckle barrel.

[0010]

The inventor of the present invention has examined various structures of conventional turnbuckle barrels and manufacturing methods thereof from various angles. Then, I considered whether or not there is a method that can minimize the wall thickness by making the stress applied during use even around the entire circumference, and can achieve an economical design. We also continued our search for a structure that is strong and resistant to deformation. And the shape
It was thought that a tubular body with a uniform cross-sectional shape in the longitudinal direction would be the most suitable structure. Furthermore, instead of directly processing the female threads on both ends of the tubular body, if the female thread member in which the right-handed thread and the left-handed thread are cut is manufactured as a single piece by fully automation, and joined to the outside of both ends of the tubular body, respectively. I thought that high-efficiency production would be possible. As a joining method, we thought that the friction welding method is the most suitable in order to prevent the stress from concentrating locally. As a result of various experiments and examinations based on the above consideration, the present invention has been completed.

The turnbuckle barrel according to the present invention is as follows. That is, a female screw member having a right-handed female thread and a female screw member having a left-handed female thread are joined to the outside of both ends of a body member made of a tubular body having a uniform cross-sectional shape when viewed in the longitudinal direction. It is a turnbuckle body. Both female screw members are joined by friction welding. And
It is desirable that the right-handed internally threaded female thread member and the left-handed internally threaded female threaded member be provided with an axial plane. The planes may be provided on both sides or on either side. There may be one plane,
It may be two or more. It is usual that the female screw member is formed in a hexagonal nut shape to form a plane surface in the axial direction, but it may be formed in a triangular shape, a square shape, or the like. The term "plane" as used herein means a surface that is useful when the tool is rotated using any tool. When installing the turnbuckle, turn the turnbuckle barrel to apply tension to the bolt. Since the target tension is as small as 49 N / mm ^2, it is sufficient to rotate one of the female screw members. Therefore, it is only necessary to provide a flat surface on at least one of the female screw members.

The method of manufacturing the turnbuckle barrel according to the present invention is as follows. That is, a body member made of a tubular body having a uniform cross-sectional shape when viewed in the longitudinal direction is formed,
On the other hand, it is a manufacturing method in which a female screw member in which a right-handed female screw is cut and a female screw member in which a left-handed female screw is cut are individually formed and processed, and these are joined to the outside of both ends of the body member by a friction welding method. When a female screw member having a right-handed female screw thread and a left-handed female screw member having a left-hand screw thread are formed as a single piece, it is desirable to form an axial plane in at least one of them. The meaning of the “plane” and the method of providing the plane are as described above.

Next, details of the turnbuckle barrel and the method for manufacturing the same according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a turnbuckle barrel in which a female screw member 2 with a right-handed female screw thread and a female screw member 3 with a left-handed female thread member are joined to the outside of both ends of an elongated body member 1 by a friction welding method. . The body member 1 is composed of a tubular body having a uniform cross-sectional shape when viewed in the longitudinal direction. As the cross-sectional shape, various kinds as shown in FIG. 2 can be adopted. Figure 2
It may be a seamless circle as in (1). (2)
As described above, one portion may be joined by welding.
The seam may be continuous joining or intermittent joining. As in (3), welding may be performed by simply abutting the facing portions with each other. As in (4), a slight gap may be left in the butted portion. As in (5), two members having a semicircular cross section may be opposed to each other to form a perfect circle. As in (6), in (5), a slight gap may be provided in the facing portion. Other members such as a three-piece shape and a four-piece shape may be combined to form a perfect circle. The material may be carbon steel or the like, but high strength steel is particularly preferable. As the molding method, those of (1), (2), (3) and (4) may be molded by using a normal pipe forming apparatus. (5) and (6) may be formed by pressing a steel plate.

The female screw members 2 and 3 may be formed by cold forging. Female thread processing may be performed using a fully automated dedicated machine. The length of the threaded portion must be 0.8 times the nominal diameter of the screw or more. The material may be high-strength steel such as carbon steel, but it is important to match the material strength of the body member 1. You may heat-process as needed. A commercially available nut included in the matching strength category may be selected and used.

Female screw members 2 and 3 are joined to the outside of both ends of the body member 1 by a friction welding method. When the friction welding method is used, not only local concentration of stress due to welding defects such as undercut can be prevented but also high-efficiency welding can be achieved by applying heating and pressurizing to increase the thickness of the joint. You can Even with the maximum size of the turnbuckle cylinder of M33 or 4 inches, it can be sufficiently joined with a general-purpose friction welding machine.
It is desirable that an annular protrusion having a thickness corresponding to the thickness of the tubular body is provided on the joint surface of the female screw members 2 and 3 so as to face the thickness of the tubular body. In this way, not only can the welds be effective, but flash friction is evenly generated in opposite directions from both members during friction welding, so that flash cutting may not even be necessary. The friction welding method includes a brake method and an inertial method, but the inertial method requires a shorter time, has higher efficiency, and produces less flash. This further reduces the manufacturing cost.

[0016]

In the turnbuckle barrel according to the present invention, female screw members are respectively joined to the outer sides of both ends of a tubular member made of a tubular body having a uniform cross-sectional shape when viewed in the longitudinal direction.
For this reason, even if stress is applied to the turnbuckle bolt during use, the stress is not concentrated on the local portions of the body member or both female screw members but is dispersed and the acting stress of each portion becomes uniform.

[0017]

EXAMPLE The turnbuckle barrels shown in FIGS. 1 and 3 were manufactured respectively. 1 is manufactured by the method of the present invention, and FIG. 3 is a comparative product manufactured for comparison. Also, for comparison, a commercially available product of pipe type and split frame type was purchased, which are shown in FIGS. 4 and 5. In FIGS. 1, 3, and 5, the nominal size of the screw of the female screw member is M12. In FIG. 4, the nominal size of the screw is 1/2 inch.

The body member 1 shown in FIG. 1 is JIS G344.
5 Carbon steel pipe for machine structure STKM13A (yield point 216
N / mm ² or more, the tensile strength of 373N / mm ² or more) the material, outside diameter 22.3 mm, wall thickness 1.9 mm, length 18
It was made of 2 mm. The female screw members 2 and 3 are JIS
G3101 General structural rolled steel SS400 (yield point 24
5N / mm ² or more, a tensile strength of 402N / mm ² or more) was the material. Then, first, a 22φ coil was formed into a hexagon, and an annular protrusion having a width of 2.3 mm and a depth of 2 mm was provided on the outer periphery of the joint surface. Next, we machined right-handed and left-handed female threads with a fully automated special machine. Then, the body member 1 is fixed by using a brake type friction welding machine, and the female screw member 2
・ Friction welding was performed while rotating 3. 3 revolutions per minute
000 times, the applied pressure was 10 kN when the frictional heat was generated, and 20 kN when the upset pressure was applied immediately after the rotation was stopped. The joining time was about 5 seconds, and the deviation during friction welding was 3 mm. After that, the outer peripheral burr was cut and removed while rotating the workpiece on the same friction welding machine. Do the same for the other side. The finished product is shown in FIG.

The structure shown in FIG. 3 was manufactured as follows. As the material of the body member, JIS G3113 hot rolled steel plate for automobile structure and steel strip SAPH400 (yield point 25
5N / mm ² or more, thickness 2.3 mm, width 30mm tensile strength 402N / mm ² or more), prepared plate of length 185 mm, was molded into a shape as shown in FIG. 3 at the press of 980KN. Then, these two sheets were put together and friction-welded under the same conditions using the same female screw members 2 and 3 as in FIG.

The turnbuckle barrel shown in FIG. 4 is a commercially available pipe type. For strengthening, insert rings are inserted into both heads for upset processing, and the insert rings are internally threaded. The screws are inch size. The upset angle is as small as 8.3 degrees. With respect to the pull in the longitudinal direction, a large force is generated in the radial direction due to the taper of the outer periphery of the insert ring, and the pipe is spread at both end portions so that the insert ring is easily pulled out. The one shown in FIG. 5 is a commercially available split frame type. B-
The cross-sectional areas of both shoulder portions shown in the B sectional view are smaller than those of the other portions, and stress is concentrated on this portion when the tensile force is applied in the longitudinal direction. Weights of the turnbuckle barrels shown in FIGS. 1, 3, and 5 were measured. In addition, JISA55
41, the longitudinal tensile test was also conducted. The results are shown in Table 1.

[0021]

[Table 1]

The weight of the turnbuckle barrel shown in FIG. 4 was measured. Further, the tensile test in the longitudinal direction was similarly conducted with reference to the US Federal Standard FF-T-791b. Since there is no regulation for the turnbuckle body, the stub (bolt) strength standard was used as a reference. The results are shown in Table 2.

[0023]

[Table 2]

The method according to the present invention shown in FIG. 1 is the lightest and has a guaranteed load of 21.0 kN and a JIS permanent deformation of 0.5.
% Not only is satisfied, but also the presence or absence of breakage is judged 4
Even with a load of 5.4 kN, the amount of permanent deformation was 0.3%, which was a sufficiently satisfactory value. It turned out to be light and strong. The comparative example of FIG. 3 uses a material having higher strength than that of FIG. 1 and increases the plate thickness,
The condition that the amount of permanent deformation was 0.5% or less was not satisfied under the guaranteed load. This is because stress concentrates on the bending-formed parts on both shoulders during the tensile test. The conventional pipe-type turnbuckle barrel shown in FIG. 4 was tested by applying US Federal Standards because the screws are in inches. As can be seen from Tables 1 and 2, the weight is approximately 1.
It is three times as large. It is weak and uneconomically designed and manufactured. The split frame type conventional product shown in FIG. 5 satisfies JIS, but the weight is 1.7 times larger than that of FIG. It is uneconomically designed and manufactured.

[0025]

In the turnbuckle barrel according to the present invention, since the barrel portion is a tubular body, the acting stress of each portion becomes equal. Therefore, considering only the simple tensile stress in the longitudinal direction, it is possible to perform an economical design in which the wall thickness is the smallest.
Regarding the body member, based on the yield point and tensile strength of the material,
Calculate the wall thickness of the tubular body from the guaranteed load (permanent deformation of the body length within 0.5%) and the tensile load (minimum) specified by JIS, and use the larger wall thickness. Good. The turnbuckle body produced in this way is J
Despite being sufficiently satisfied with the IS value strength, it is significantly lighter than the conventional product, and the material saving effect is also remarkable. Further, by using a high-strength material as a raw material, a high-stress design can be performed, and the wall thickness can be further reduced and the weight can be reduced to further save the raw material. Turnbuckle trunk is a building
Since it is widely used in vehicles and the number of used is enormous, the effect of weight reduction greatly contributes to resource saving.

Even in the threaded portion of the female threaded member, uniform stress acts on the entire circumference, so that the female threaded member having a normal threaded length (the threaded length is 0.8 times or more of the nominal diameter of the screw). Can be used. This female screw member can be manufactured as a single item at a low cost by fully automation. Further, a commercially available nut that matches the material strength of the body member can be selected and used, and in this case, the cost can be reduced. The body member and the female screw member are joined by the friction welding method. For this reason, welding defects such as undercuts can be eliminated, and local concentration of stress can be avoided, and since welding is performed by applying heating and pressure, high-efficiency welding can be performed while increasing the thickness of the joint. .

[Brief description of drawings]

FIG. 1 is a front view and a side view showing an example of a turnbuckle barrel according to the present invention.

FIG. 2 is a sectional view showing various sectional shapes of a turnbuckle barrel according to the present invention.

FIG. 3 is a front view, a side view, and an AA cross-sectional view showing a comparative product.

FIG. 4 is a partial cross-sectional view showing an example of a conventional turnbuckle.

FIG. 5 is a front view showing another example of a conventional turnbuckle, A
It is a sectional view taken on the line A-A and a sectional view taken on the line BB.

FIG. 6 is a partial cross-sectional view showing an example of a conventional turnbuckle with a part omitted.

FIG. 7 is a partial cross-sectional view showing another example of a conventional turnbuckle with a part omitted.

FIG. 8 is a partial cross-sectional view showing still another example of a conventional turnbuckle with a part omitted.

FIG. 9 is a partial cross-sectional view showing still another example of a conventional turnbuckle with a part omitted.

FIG. 10 is a partial cross-sectional view showing still another example of a conventional turnbuckle with a part omitted.

FIG. 11 is a partial cross-sectional view showing a main part of still another example of the conventional turnbuckle.

[Explanation of symbols]

 1 Body member 2 Female screw member 3 Female screw member

[Procedure amendment]

[Submission date] June 28, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

According to JISA 5540, "In the brace design, it is premised that each joint element does not break before the yield of the brace shaft, and it is expected that seismic energy will be absorbed by the plastic elongation of the brace shaft. "The yield strength of the welded part of the turnbuckle bolt shank (cylindrical part) with the battledore is sufficiently higher than the yield strength of the turnbuckle bolt shank." . It is considered that the strength performance required for the turnbuckle cylinder is that the deformation amount is small and the strength is high. In addition, recently, there is an increasing tendency for the walls of buildings to become thinner, and there is a demand for a turnbuckle body to be installed in a narrow space.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

In the structure shown in FIG. 8, when two of the curved members are butted and the portions to be both heads are resistance-welded in the longitudinal direction, it is easy to deform due to pressure into an elliptical shape having the major axis of the welded portion. For this reason, it is necessary to increase the wall thickness more than necessary so that the entire circumference can be cut during the internal thread processing. The extra thickness makes the design uneconomical.
Further, in the case of a large-sized turnbuckle barrel, the area of the resistance welding portion becomes too large and a large capacity welding machine is required. Therefore, practical application is difficult. In the case of FIG. 9, upper and lower flat plates are joined to the left and right heads by arc or gas welding. There are many welds in 16 places, and it takes too much time to weld. In addition, it is difficult to automatically weld by a robot or the like, and the production efficiency is significantly deteriorated. As described above, the conventional products have various drawbacks. The inventor of the present invention has been able to complete the present invention as a result of continuing research and experiments over many years on how to eliminate such defects all at once. The problem to be solved by the present invention is to make the stress applied during use as uniform as possible over the entire circumference so that the wall thickness can be as small as possible. Therefore, an economical design can be achieved and the strength is high. It is an object of the present invention to provide a turnbuckle barrel that is resistant to deformation and requires a small installation space, and a highly productive manufacturing method for manufacturing such a turnbuckle barrel.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

Next, details of the turnbuckle barrel and the method for manufacturing the same according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a turnbuckle barrel in which a female screw member 2 with a right-handed female screw thread and a female screw member 3 with a left-handed female thread member are joined to the outside of both ends of an elongated body member 1 by a friction welding method. . The body member 1 is composed of a tubular body having a uniform cross-sectional shape when viewed in the longitudinal direction. The diameter is preferably twice the diameter of the bolt or less from the viewpoint of reducing the mounting space. As the cross-sectional shape, various kinds as shown in FIG. 2 can be adopted. A seamless circle may be used as shown in FIG. As in (2), one portion may be joined by welding. The seam may be continuous joining or intermittent joining. As in (3), welding may be performed by simply abutting the facing portions with each other. As in (4),
A slight gap may be left at the butting portion. (5)
As described above, two members having a semicircular cross section may be opposed to each other to form a perfect circle. As in (6), in (5), a slight gap may be provided in the facing portion. Other members such as a three-piece shape and a four-piece shape may be combined to form a perfect circle. The material may be carbon steel or the like, but high strength steel is particularly preferable. The molding method is (1) (2)
The items (3) and (4) may be molded by using a normal pipe forming apparatus. (5) and (6) may be formed by pressing a steel plate.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

Even in the threaded portion of the female threaded member, uniform stress acts on the entire circumference, so that the female threaded member having a normal threaded length (the threaded length is 0.8 times or more of the nominal diameter of the screw). Can be used. This female screw member can be manufactured as a single item at a low cost by fully automation. Further, a commercially available nut that matches the material strength of the body member can be selected and used, and in this case, the cost can be reduced. The body member and the female screw member are joined by the friction welding method. For this reason,
Welding defects such as undercuts can be eliminated, and local concentration of stress can be avoided. In addition, since joining is performed by applying heat and pressure, highly efficient joining can be performed while increasing the thickness of the joined portion. Further, the turnbuckle barrel according to the present invention is most suitable for use in a place where the installation space is small due to the tendency of the wall of the building to become thinner.

Claims (4)

[Claims] 1. A female thread member having a right-handed female thread and a female thread member having a left-handed female thread are provided outside both ends of a body member made of a tubular body having a uniform cross-sectional shape when viewed in the longitudinal direction. Turnbuckle body joined together. 2. An axial plane is provided on at least one of a female screw member having a right-handed female thread cut and a left-handed female screw member having a left-handed female thread.
The turnbuckle body according to claim 1. 3. A body member made of a tubular body having a uniform cross-sectional shape when viewed in the longitudinal direction is formed, and on the other hand, a female screw member having a right-handed female thread and a female screw member having a left-handed female thread are respectively formed. A method for manufacturing a turnbuckle body, which is formed as a single piece and is joined to the outside of both ends of a body member by a friction welding method. 4. When a female screw member having a right-handed female screw thread or a left-handed female screw member having a left-handed thread is formed as a single piece, at least one of them is provided with an axial plane. The method for manufacturing a turnbuckle body according to claim 3, which is characterized in that.