JPH11210721A - Stringing material and truss structure using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give a sufficient tensile strength and esthetic external appearance by screwing a pair of metal bars provided with a male screw on the outer periphery surface of a diameter expansion part cold worked a tip part into a connection member provided with a reverse female screw on the inner periphery surface of a pair of coaxial engaging holes from both ends facing to the center. SOLUTION: A stringing material 17 is composed of steel rods 18, 19 and a member 20 for connecting both. A first engaging hole 21 extending from A side to the center and second engaging hole 22 extending from B side to the center coaxially with the engaging hole 21 are provided on the connection member 20 and right and left female screws 23, 24 are installed on the inner periphery surface of the engaging holes 21, 22. Diameter expansion parts 18a, 19a expanded to a prescribed diameter by a cold working are provided on the tip parts of the steel bars 18, 19 and a right male screw 25 screwed with a right female screw 23 is installed on the outer periphery surface of the diameter expansion part 18a and a left male screw 26 screwed into a left female screw 24 in installed on the outer periphery surface of the diameter expansion part 19a. Therefore, the effective sectional area of the male screws 25, 26 becomes larger than the sectional area of a unengaging part and the tensile strength of the steel bars 18, 19 is ensured and the stringing material 17 excellent in the esthetic external appearance can be constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a string member and a truss structure using the string member.

[0002]

2. Description of the Related Art In recent years, with the widespread use of a perforated tempered glass facade construction method (dot point construction method), examples of constructing an outer wall of a building with a large glass screen include lighting,
It is increasing in terms of good visibility. In glass screens, the support structure supporting the glass may be a steel cubic with a large cross section, but a light and innovative design is possible to emphasize the transparency of the glass A truss structure is often used. Also,
It is desired that the truss structure is configured using a steel rod or a cable having a cross section as small as possible in order to improve the aesthetic appearance.

FIG. 5 is a perspective view showing an example of a truss structure.
FIG. 6 is an axial cross-sectional view of a main part of an example of the string material applied to the truss structure (a part where the steel bar constituting the string material is connected via a connecting member). The truss structure has a support frame 3 formed by a substantially vertically extending cubic 1 and a substantially horizontally extending blind 2, and a flat plate formed in a cross shape on both sides of an intersection of the cubic 1 and the blind 2. , A frame-side supporting member 4, a bar-shaped compression member 5 and a string member 6.

A glass sheet 7 constituting a glass screen is inserted into the support frame 3. Further, the compressed material 5 is provided on both sides of the non-intersecting portion between the ridge 1 and the blind 2 so as to protrude in a direction orthogonal to the glass screen.

[0005] The string member 6 is composed of a pair of steel rods 8, 9 arranged coaxially, and a connecting member 10 which can be screwed to the ends of the steel rods 8, 9 to connect them. Connecting member 10
An engagement hole 12 extending from one end toward the center and having a right female screw 11 screwed on the inner peripheral surface, and a left internal screw 13 extending coaxially with the engagement hole 12 from the other end toward the center. And a threaded engagement hole 14.

At the tip of the steel rod 8, a right male screw 15 that can be screwed into the right female screw 11 screwed to the connecting member 10 is screwed, and at the tip of the steel rod 9, it is screwed to the connecting member 10. A left male screw 16 that can be screwed into the left female screw 13 is screwed.
The base ends of the steel rods 8 and 9 are different from each other on the frame side supporting members 4.
It is connected to. The tips of the steel rods 8 and 9 are screwed into the female screws 11 and 13 of the connecting member 10 to which they are fitted, respectively.
By rotating the connecting member 10, the overall length of the string member 6 can be adjusted, and an initial tension can be applied to the string member 6.

[0007]

However, since the steel rods 8, 9 constituting the string member 6 are formed by directly threading the tips of the steel rods 8, 9, external threads 15, 16 are provided. The diameter d1 of the portion (the root diameter of the external thread) is naturally smaller than the diameter D of the main body portion. That is, the steel rod 8,
9 is that the effective cross-sectional area of the portion where the male screws 15 and 16 are screwed is smaller than the cross-sectional area of the main body portion, and the portion where the male screws 15 and 16 at the tips of the steel rods 8 and 9 are screwed is a weak point in strength. Become. For this reason, the allowable tensile strength of the steel rods 8, 9 is 1 male thread.
It is determined by the effective sectional area of the portion where the threads 5 and 16 are screwed.

Accordingly, in order to provide the tension member 6 with sufficient tensile strength, it is necessary to increase the effective cross-sectional area of the portion where the external threads 15 and 16 of the steel bars 8 and 9 are screwed. It is necessary to make the diameter of the body part of Ninth one size larger. For example, even if steel rods 8 and 9 having a diameter of 12 mm are sufficient to satisfy the required allowable tensile strength, M12 external threads 15 and 16 are threaded at the tips of the steel rods 8 and 9. The effective diameter of the tip is the root diameter of the M12 male screw, and the strength is insufficient. Accordingly, the diameters of the steel rods 8 and 9 are slightly increased to make the diameter of the main body part 14 mm, and M14 external threads 15 and 16 are screwed at the tips of the steel rods 8 and 9 so that the effective diameter of the tip parts is reduced. Although it is necessary to make the external thread root diameter M14, the diameter of the steel rods 8 and 9 becomes large, and the aesthetic appearance of the truss structure deteriorates.

There is also a conventional technique in which the cross-sectional area of the tip of a steel rod is made larger than the cross-sectional area of the main body of the steel rod by hot working, and the tip is threaded. If this is the case, the cross-sectional area of the main body of the steel rod can be minimized. However, when only the tip portion of the steel rod is hot-treated, the crystal structure is different at the boundary with the body portion of the steel rod that has not been subjected to the hot treatment, so that strength reduction and rusting are likely to occur at the boundary portion. Therefore, it is necessary to reheat the entire steel rod to make the crystal structure of the entire steel rod uniform.However, since the steel rod often becomes long, it is necessary to reheat the entire steel rod in equipment. It is difficult.

The present invention has been made in view of the above circumstances, and has as its object to provide a tension member having sufficient tensile strength, a small diameter, and an excellent aesthetic appearance, and a truss structure using the tension member. .

[0011]

In order to achieve the above object, the present invention provides a female screw on the inner peripheral surface of a first engagement hole extending from one end toward the center, and a first screw from the other end toward the center. A connecting member provided with a female screw of a reverse thread on the inner peripheral surface of a second engaging hole extending coaxially with the engaging hole of the first member, and a first enlarged portion formed by cold working at a distal end portion; A first metal rod provided with an external thread which can be screwed into an internal thread of the first engagement hole on an outer peripheral surface of the enlarged diameter portion, and a second enlarged diameter portion formed by cold working at a tip portion; A second metal rod provided on the outer peripheral surface of the second enlarged diameter portion with a male screw of a reverse screw that can be screwed into the female screw of the second engagement hole, and a first enlarged diameter of the first metal rod. A portion is screwed into the first engaging hole of the connecting member, and a second string bar is screwed into the second enlarged hole of the second metal bar to provide a tension member.

Also, a first extending from one end toward the center.
A connecting member provided with a female screw on the inner peripheral surface of the engaging hole and provided with a female screw on the inner peripheral surface of the second engaging hole extending coaxially from the other end toward the center with the first engaging hole. A first metal rod having a first enlarged diameter portion formed by cold working at a tip portion;
A first connection cylinder having a male screw externally fitted to the first metal rod such that a tip thereof abuts on the first enlarged diameter portion and having an outer thread provided on an outer peripheral surface thereof and capable of being screwed into a female thread of the first engagement hole; A second metal rod having a second enlarged-diameter portion formed by cold working at a tip portion;
A second connecting cylinder externally fitted to the second metal rod so as to abut against the enlarged diameter portion, and having a male screw of a reverse screw provided on the outer peripheral surface thereof, which can be screwed into the female screw of the second engagement hole. The first connecting cylinder is threadedly engaged with the first engagement hole of the coupling member, and the second coupling cylinder is threadedly engaged with the second engagement hole of the coupling member.

[0013] Further, at least one of the first metal bar and the second metal bar may be connected to a crossing portion of a support frame forming a truss structure or to a string member protruding from a non-crossing portion of the support frame. The truss structure used is provided.

In the present invention, a male screw which can be screwed into a female screw provided in each engagement hole of the connecting member is provided at each of the enlarged diameter portions formed by cold working at the tip end of each metal rod,
The cross-sectional area of the engaging portion of the metal bar with respect to the connecting member is made larger than that of the non-engaging portion to secure the tensile strength of the metal bar.

[0015] A connecting cylinder which is fitted to the non-expanded portion of the metal rod and is screwed into an engaging hole of the connecting member at each of the enlarged diameter portions formed by cold working at the tip end of each metal rod. Are brought into contact with each other, and the cross-sectional area of the engaging portion of the metal rod with respect to the connecting cylinder is made larger than that of the non-engaging portion to secure the tensile strength of the metal rod.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a first embodiment of a string member according to the present invention, FIG. 2 is an axial sectional view of the string member related to FIG. 1, and FIG. 3 is a second embodiment of the string member according to the present invention. FIG. 4 is an axial sectional view of a string member related to FIG.

1 and 2 are a pair of steel rods 18 and 19 disposed coaxially and a pair of steel rods 18 and 1.
And a connecting member 20 that can be screwed to the end of the connecting member 9 to connect the two.

The connecting member 20 is a right cylindrical shape having a slightly tapered end portion and a central portion 20a having a substantially hexagonal cross section. The cross section near the central portion 20a changes from circular to hexagonal. The portion where the heat is applied is formed in a smooth arc shape in order to avoid stress concentration. The connecting member 20 has a first engagement hole 21 extending from one end A to the center and a second engagement hole 21 extending coaxially from the other end B to the center. Engagement hole 2
2 are provided. A right female screw 23 is screwed on the inner peripheral surface of the first engagement hole 21, and a left female screw 24 is screwed on the inner peripheral surface of the second engagement hole 22.

The steel rods 18 and 19 have enlarged diameter portions 18a and 19a which are enlarged to predetermined diameters by cold working at the tips. On the outer peripheral surface of the enlarged diameter portion 18a of one steel rod 18, a right male screw 25 that can be screwed into the right female screw 23 of the first engagement hole 21 is screwed. On the outer peripheral surface of the portion 19a, a left male screw 26 that can be screwed into the left female screw 24 of the second engagement hole 22 is screwed.

The base ends of the steel bars 18 and 19 are connected to different frame-side support members 4 (see FIG. 5). The right external thread 25 of the enlarged diameter portion 18a of one steel rod 18 is screwed into the right internal thread 23 of the connecting member 20, and the left external thread 26 of the enlarged diameter portion 19a of the other steel rod 19 is the left internal thread of the coupling member 20. 2
4 screwed.

Therefore, when a tool such as a wrench is applied to the central portion 20a of the connecting member 20 having a hexagonal cross section and the connecting member 20 is rotated in a predetermined direction, the steel bars 18, 19 are pulled so as to approach each other, Adjustment of the entire length of the string member 17 and application of initial tension are performed.

As described above, in the string member 17 shown in FIGS. 1 and 2, the enlarged diameter portions 18a, 18a at the tips of the steel bars 18, 19 are provided.
Since the male screws 25 and 26 which can be screwed to the female screws 23 and 24 of the connecting member 20 are provided on the connection member 19a, the effective cross-sectional area of the male screws 25 and 26 of the steel rods 18 and 19 is larger than the cross-sectional area of the non-engagement portion. growing. Therefore, it is possible to configure the stringing member 17 having an excellent aesthetic appearance while sufficiently securing the tensile strength of the steel bars 18, 19, and if the stringing member 17 is applied to a truss structure as shown in FIG. Thus, the overall aesthetic appearance of the truss structure is improved. further,
Since the enlarged diameter portions 18a, 19a of the steel rods 18, 19 are formed by cold working, working costs can be reduced as compared with hot working.

The string member 27 in FIGS. 3 and 4 includes a pair of steel rods 28 and 29 disposed coaxially, and the steel rods 28 and 29.
29, the connecting cylinders 30, 3 which are externally fitted and locked at respective ends of the connecting cylinders 30,
1 and the connecting cylinders 30 and 31
1 and a connecting member 32 capable of connecting the steel rods 28 and 29 via the connecting member 32.

The connecting member 32 is a right cylindrical shape having a slightly tapered end portion and a central portion 32a having a substantially hexagonal cross section. The cross section near the central portion 32a is changed from circular to hexagonal. The changing portion is formed in a smooth arc shape to avoid stress concentration. The connecting member 32 has a first engagement hole 33 extending from one end A to the center and a second engagement hole 33 extending coaxially from the other end B to the center. Engagement hole 3
4 are provided. A right female screw 35 is screwed on the inner peripheral surface of the first engagement hole 33, and a left female screw 36 is screwed on the inner peripheral surface of the second engagement hole 34.

The steel rods 28, 29 are provided with enlarged diameter portions 28a,
29a. The base ends of the steel bars 28 and 29 are connected to different frame-side support members 4 (see FIG. 5).

One connecting cylinder 30 has a through hole 37 which is fitted around the tip of one steel rod 28 and engages with the tip of the steel rod 28 so as not to come off by the enlarged diameter portion 28a. .
A right external thread 38 that can be screwed into the right internal thread 35 of the first engagement hole 33 of the coupling member 32 is provided on the outer peripheral surface of the distal end portion of the coupling cylinder 30. In addition, on the outer peripheral surface of the base end portion of the connecting cylinder 30, the right male screw 38 is connected to the right female screw 35 of the connecting member 32.
Is formed with a tool engaging portion 39 composed of two parallel surfaces to which a tool such as a wrench can be fitted when screwed into the tool.

The other connecting cylinder 31 has a through hole 40 which is fitted to the distal end of the other steel rod 29 and is engaged with the distal end side of the steel rod 29 by the enlarged diameter portion 29a. .
A left male screw 41 that can be screwed into the left female screw 36 of the second engagement hole 34 of the connecting member 32 is provided on the outer peripheral surface of the distal end portion of the connecting cylinder 31. The left external thread 41 is connected to the left internal thread 36 of the connecting member 32 on the outer peripheral surface of the base end of the connecting cylinder 31.
Is formed with a tool engaging portion 39 composed of two parallel surfaces to which a tool such as a wrench can be fitted when screwed into the tool.

The right external thread 38 of one connecting cylinder 30 is screwed into the right internal thread 35 of the connecting member 32 and the other connecting cylinder 31
The left external thread 41 is screwed into the left internal thread 36 of the connecting member 32.

Therefore, the central portion 32a of the connecting member 32 having a hexagonal cross section is locked by a tool such as a spanner,
When a tool such as a wrench is applied to the tool engaging portions 39 of 0 and 31 and the connecting cylinders 30 and 31 are rotated in a predetermined direction, the steel rods 28 and 29 are pulled in a direction approaching each other, and the entire string member 27 is stretched. Length adjustment and initial tension application are performed.

As described above, in the string member 27 shown in FIGS. 3 and 4, the connecting cylinders 30 and 31 which are externally engaged with the enlarged diameter portions 28a and 29a of the steel rods 28 and 29 are fitted with the female screws 35 and Since the male screws 38 and 41 that can be screwed are provided on the 36, the effective cross-sectional area of the male screws 38 and 41 of the steel rods 28 and 29 is larger than the non-engaged portion. Therefore, the steel rod 28,
It is possible to construct the string member 27 having an excellent aesthetic appearance while sufficiently securing the tensile strength of the string member 29.
When 7 is applied to a truss structure as shown in FIG. 5, the overall aesthetic appearance of the truss structure is improved. Further, the enlarged diameter portions 28a, 2 of the steel rods 28, 29
Since 9a is formed by cold working, working costs can be reduced as compared with hot working.

It should be noted that the string material of the present invention is not limited to only the above-described embodiment, and the first metal rod and the second metal rod are made of steel instead of steel. It goes without saying that various changes can be made without departing from the scope of the present invention.

[0032]

As described above, according to the string material of the present invention and the truss structure using the string material, the following various excellent effects can be obtained. (1) In the string member according to the first aspect of the present invention, a male screw which can be screwed into a female screw provided in each engagement hole of the connecting member at an enlarged diameter portion formed by cold working at the tip of each metal rod. Is established,
Since the cross-sectional area of the engaging portion of the metal bar with respect to the connecting member is made larger than the cross-sectional area of the non-engaging portion, the tensile strength of the metal bar can be secured. (2) In the string material according to the second aspect of the present invention, the enlarged diameter portion formed by cold working at the tip end portion of each metal rod is externally fitted to the non-diameter enlarged portion of the metal rod and the engagement of the connecting member. The distal end of the connecting cylinder screwed into the hole is brought into contact with the connecting cylinder, and the cross-sectional area of the engaging portion of the metal rod with the connecting cylinder is made larger than the cross-sectional area of the non-engaging portion, so that the tensile strength of the metal rod can be secured. (3) Therefore, in any of the string members according to claim 1 or 2 of the present invention, a string member excellent in aesthetic appearance can be formed while sufficiently securing the tensile strength of the metal bar. (4) Further, in any of the string members according to claim 1 or 2 of the present invention, the enlarged diameter portion of the steel rod is formed by cold working, so that the working cost can be reduced as compared with hot working. Can be planned. (5) In the truss structure according to claim 3 of the present invention,
Since the string material according to claim 1 or 2 is used, the overall aesthetic appearance of the truss structure can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first example of an embodiment of a string member according to the present invention.

FIG. 2 is an axial cross-sectional view of the string material related to FIG. 1;

FIG. 3 is a perspective view showing a second example of the embodiment of the string material according to the present invention.

FIG. 4 is an axial cross-sectional view of the string material related to FIG. 3;

FIG. 5 is a perspective view showing an example of a truss structure.

FIG. 6 is an axial cross-sectional view of an example of a string member related to FIG. 5;

[Explanation of symbols]

 18, 28 steel rod (first metal rod) 18a, 28a enlarged diameter part (first enlarged diameter part) 19, 29 steel rod (second metal rod) 19a, 29a enlarged diameter part (second enlarged diameter) 20, 32 Connecting member 21, 33 First engaging hole 22, 34 Second engaging hole 23, 35 Right female screw (female screw) 24, 36 Left female screw (female screw of reverse screw) 25, 38 Right male screw ( Male screw) 26,41 Left male screw (male screw)

Claims (3)

[Claims] An internal thread is provided on an inner peripheral surface of a first engaging hole extending from one end toward the center, and a second engaging hole extending coaxially with the first engaging hole from the other end toward the center. A connecting member provided with a female screw of a reverse thread on the inner peripheral surface thereof, a first enlarged portion formed by cold working at a tip portion, and a first engagement hole formed on an outer peripheral surface of the first enlarged portion. A first metal rod provided with a male screw that can be screwed into the female screw of the first metal rod, a second enlarged diameter portion formed by cold working at a tip end portion, and a second engaging member formed on an outer peripheral surface of the second enlarged diameter portion. A second metal rod provided with a reverse threaded external thread capable of being screwed to the female screw of the mating hole, wherein the first enlarged diameter portion of the first metal rod is screwed into the first engagement hole of the connecting member. A string member, wherein a second enlarged diameter portion of a second metal rod is screwed into a second engagement hole of a connecting member. 2. A second engaging hole which is provided with an internal thread on an inner peripheral surface of the first engaging hole extending from one end toward the center and coaxial with the first engaging hole from the other end toward the center. A connecting member provided with a female screw of a reverse thread on the inner peripheral surface thereof, a first metal rod having a first enlarged diameter portion formed by cold working at a distal end portion, and a distal end contacting the first enlarged diameter portion. Connecting cylinder having a male screw externally fitted to the first metal rod and having an external thread which can be screwed into the female screw of the first engagement hole as described above, and a second expansion by cold working at a tip end portion. A second metal rod having a diameter portion, which can be externally fitted to the second metal rod so that the tip thereof abuts on the second enlarged diameter portion, and which can be screwed to the female screw of the second engagement hole on the outer peripheral surface; A second connecting cylinder provided with a male screw having a strong reverse screw, the first connecting cylinder is screwed into a first engagement hole of the connecting member, and the second connecting cylinder is connected to a second engaging member of the connecting member. Screw into the mating hole A string material characterized by that. 3. A crossing portion of a support frame forming a truss structure, wherein at least one of the first metal bar and the second metal bar is provided.
3. The connecting member according to claim 1, wherein the connecting member is connected to a string member protruding from a non-intersecting portion of the support frame.
A truss structure using the string material described in (1).