JP3208052B2 - Back nut hardware and steel tube with back nut - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back nut fitting and a steel pipe with a back nut, and more particularly to a back nut fitting and a steel pipe with a back nut used, for example, for bolting a steel pipe to another member.

[0002]

2. Description of the Related Art For example, a base member 3 fixed to an upper surface of a foundation 1 with an anchor bolt 2 and a steel pipe 4 as a pillar are provided.
5 , a bolt hole (not shown) is formed at the lower end of the steel pipe 4 and a nut is formed on the inner surface of the steel pipe 4 so as to correspond to the bolt hole. 5 is welded. Then, the lower end of the steel pipe 4 is inserted into the receiving portion 6 of the base member 3, and a bolt hole 7 formed in the side surface of the receiving portion 6 is formed.
The bolt 8 is passed through a bolt hole (not shown) formed at the lower end of the steel pipe 4 and screwed into the nut 5.

[0003]

In the prior art, a steel pipe 4
There is a problem in that it is troublesome to weld the nut 5 to the inner surface. Further, if a displacement occurs between a bolt hole (not shown) of the steel pipe 4 and the nut 5, this displacement cannot be easily corrected, so the bolt 8 is screwed into the nut 5. There was also a problem that it became difficult.

[0004] Therefore, a main object of the present invention is to provide a back nut fitting and a steel tube with a back nut, which can dramatically improve the workability when bolting a steel pipe to another member.

[0005]

According to a first aspect of the present invention, a rectangular section is provided.
Back nut to be installed between the inner surfaces of the two opposite sides of the steel pipe
Metal parts that are formed by bending a long metal plate into a trapezoidal shape.
Forms were and have a two plate-like portions extending upper portion from both ends of the upper portion, the inner surface of the two sides of the length of the upper side portion
Metal fittings set to be almost the same as the interval between the two plate-shaped parts
A locking piece formed by being bent outward at an end, and at least one of the plate-like portions has a center at a position at a predetermined distance from the locking piece.
A back nut hardware comprising a hole formed as described above, and at least one nut attached to the plate-shaped portion corresponding to the hole.

The second invention comprises a steel pipe having a rectangular cross section , and a bolt hole formed in at least one of the opposing side surfaces of the steel pipe, and the back of the first invention is arranged so that the nut corresponds to the bolt hole in position. Nut fittings inside the opposite side of steel pipe
It is a steel pipe with a back nut attached between .

[0007]

For example, a bolt hole is formed in a side surface of a steel pipe, and a back nut fitting is mounted on the inner surface of the steel pipe such that a nut corresponds to the bolt hole. At this time, the bracket is long
Since the hand metal plate is formed by being bent into a trapezoidal shape, the plate-like portion is pressed against the inner surface of the steel pipe by the elastic force, whereby the nut is positioned at a predetermined position on the inner surface of the steel pipe. Since the nut is positioned by the elastic force of the metal fitting in this manner, the positional deviation between the bolt hole and the nut can be easily corrected even after the mounting of the back nut hardware.

[0008]

According to the first and second aspects of the present invention, it is possible to save time and effort for welding a nut to the inner surface of a steel pipe.
Since the displacement between the bolt hole of the steel pipe and the nut can be easily corrected, the bolt can be easily screwed into the nut. Therefore, the workability when bolting the steel pipe to another member can be remarkably improved.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A back nut fitting 10 of this embodiment shown in FIG.
For example, as shown in FIG. 2, when connecting a steel pipe 18 as a pillar to a base member 16 fixed to an upper surface of a foundation 12 using an anchor bolt 14, a bolt hole formed in a side face of the steel pipe 18 is used. The nut 22 is positioned on the inner surface of the steel pipe 18 so as to correspond to the position 20.

Here, the steel pipe 18 is formed in a hollow pipe shape having a substantially square cross section, and a bolt hole 20 is formed at a position at a height L ₁ from the lower end of the steel pipe 18. On the other hand, the base member 16
Includes a substantially plate-shaped pedestal 24, and approximately at the center of the pedestal 24,
A receiving portion 26 for receiving the end of the steel pipe 18 is formed. A bolt hole 28 having substantially the same size as the bolt hole 20 is formed on the side surface of the receiving portion 26 at a position of the height L ₁ so as to correspond to the bolt hole 20 formed in the steel pipe 18. . Further, a bolt hole (not shown) for passing the anchor bolt 14 is formed in the pedestal 24.

The back nut hardware 10 (FIG. 1) includes two metal fittings 30 obtained by bending a metal plate such as a stainless steel plate or a spring steel plate into a substantially trapezoidal shape. Hardware 30
Is set to be substantially the same as the distance L ₂ (FIG. 2) between two opposing inner surfaces of the steel pipe 18, and the upper surface of the central portion of the upper side 32 has a substantially rectangular recess 34.
Is press-formed. Therefore, a convex portion (not shown) is formed on the lower surface side of the upper side portion 32. Also, the upper side 32
Plate-shaped portions (side portions) 36 extending downward from both ends of the
A nut mounting portion 38 for mounting the nut 22 is formed at a central portion in the longitudinal direction of the plate by bending the plate-shaped portion 36 toward the inner surface side in a substantially U-shape. The nut mounting hole 4 is positioned so that the center is located at a position L ₁ (FIG. 2) away from the lower end of the portion 36.
0 (FIG. 3) is formed. Also, on both ends in the width direction of the nut mounting portion 38, a holding piece 4 for holding the nut 22 is provided.
2 are formed rising to the inner surface side. Further, a press-contact piece 46 is formed at a corner formed by the upper piece 32 and the plate-shaped portion 36 by cutting and raising the metal fitting 30 itself. At the lower end of the plate-shaped part 36, the metal fitting 30 itself is directed outward. The locking piece 48 is formed by bending.

The nut 22 mounted on the nut mounting portion 38 includes a main body 52 having an internal thread 50 on its inner peripheral surface, as shown in FIGS. stand up from a substantially cylindrical engagement portion 54 having an outer diameter L ₄ slightly smaller than the inner diameter L ₃ of the nut mounting hole 40 is formed. When attaching the nut 22 to the nut attaching portion 38, first, the engaging portion 54 (which is cylindrical at this time) of the nut 22 is
8 is inserted into the nut mounting hole 40 from the inner surface side, and an engaging ring 56 having a tapered inner peripheral surface is fitted to the engaging portion 54 projecting to the outer surface side of the nut mounting portion 38. Then, the diameter of the engaging portion 54 is increased in a tapered shape using a diameter increasing jig, and the outer peripheral surface of the engaging portion 54 is locked to the inner peripheral surface of the engaging ring 56. When the nut 22 is mounted on the nut mounting portion 38, the lateral movement of the nut 22 is restricted by the holding piece 42 (FIG. 3), but the vertical movement of the nut 22 is controlled by the inner diameter L _{3 of the} nut mounting hole 40. only difference L ₅ is permitted between the outer diameter L ₄ of the engaging portion 54 (FIG. 4).

When assembling the back nut hardware 10 (FIG. 1), two metal fittings 30 to which the nut 22 is attached are prepared, and the upper side 32 of one metal fitting 30 and the upper side 32 of the other metal fitting 30 are substantially formed. The two are overlapped in a cross shape, and in this state, the two are joined using rivets 58. At this time, the metal fitting 30 arranged on the upper side in the concave portion 34 of the metal fitting 30 arranged on the lower side.
(The lower surface side of the concave portion 34) is fitted, so that no positional displacement occurs between the two metal fittings 30.

When connecting the steel pipe 18 to the base member 16 using such a back nut fitting 10, the back nut fitting 10 is first inserted into the steel pipe 18 from below, as shown in FIG. The locking piece 48 is locked to the lower edge of the 18. Since each plate-like portion 36 of the back nut fitting 10 is spread outward as it goes downward, the back nut fitting 1
0 is inserted into the steel pipe 18, each plate-shaped portion 36
Needs to be deformed inward. Therefore, when the back nut fitting 10 is mounted inside the steel pipe 18, the plate-like portions 36 are pressed against the inner surface of the steel pipe 18 together with the press-contact pieces 46 by the resilient force of each other . The distance from the lower end of the plate portion 36 to the nut 22 is determined by the distance between the lower end of the steel pipe 18 and the bolt hole 2.
Since the height L ₁ is set substantially equal to 0, each plate-like portion 36 is pressed against the inner surface of the steel pipe 18 and
The nut 22 is positioned so as to correspond to the bolt hole 20 in position.

Then, the back nut fitting 1 is placed inside the steel pipe 18.
After attaching the steel pipe 18, the lower end of the steel pipe 18 is inserted into the receiving part 26 of the base member 16, and the bolt 60 is inserted through the bolt hole 28 of the receiving part 26 and the bolt hole 20 of the steel pipe 18. Screw together. According to this embodiment, each nut 22 can be positioned at a predetermined position only by mounting the back nut hardware 10 inside the steel pipe 18, so that the workability is dramatically improved as compared with the conventional technique in which the nut 22 is welded. Can be improved. Moreover, certain vertical movement of the nut 22 in the range L ₅
(FIG. 4), the displacement of the nut 22 can be easily corrected.

In this embodiment, two metal fittings 30 are used to position the nuts 22 on the four sides of the steel pipe 18.
However, when the nut 22 is positioned on one side or two opposite sides of the steel pipe 18, the metal fitting 30 is used.
May be used alone .

[0018]

[0019]

[0020]

[0021]

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing how to use the embodiment of FIG. 1;

FIG. 3 is an illustrative view showing a nut mounting structure in the embodiment in FIG. 1;

FIG. 4 is an illustrative view showing a nut mounting structure in the embodiment in FIG. 1;

FIG. 5 is a perspective view showing a conventional technique.

DESCRIPTION OF SYMBOLS 10 … Back nut hardware 12… Foundation 14… Anchor bolt 16… Base member 18… Steel pipe 20, 28 … Bolt hole 22 … Nut 30… Metal fitting 32… Upper side 36… Plate-like part 42… … Locking piece

Continued on the front page (72) Inventor Tomonori Fujiwara 3-12-12 Minamisenba, Chuo-ku, Osaka City Inside Kubota House Co., Ltd. (72) Inventor Tatsuya Nagashima 1-3-3 Shinsenri Higashicho, Toyonaka-shi, Osaka Japan Power Fastening (56) References JP-A-8-35514 (JP, A) JP-A 64-15816 (JP, U) JP-A-2-71106 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F16B 37/00

Claims (2)

(57) [Claims] 1. A steel pipe having a rectangular cross section and having two opposite sides.
A metal back nut to be mounted between surfaces, formed by bending a long metal plate into a trapezoidal shape, and
Part a chromatic and ends two plate portions extending from the upper side
The length of the upper side is defined as the distance between the inner surfaces of the two side surfaces.
Metal fittings set to be substantially the same, formed by being bent outward at the tips of the two plate-like portions.
A predetermined distance from the locking piece to at least one of the locking piece and the plate-shaped portion.
A back nut fitting comprising: a hole formed centered at a separated position; and at least one nut attached to the plate-shaped portion corresponding to the hole. 2. A steel pipe having a rectangular cross section , and opposed steel pipes .
That medium from at least one to the lower end of the side surface at a position a predetermined distance
Comprising a bolt hole which is formed with a heart, attached to the back <br/> nut hardware such that the nut is positioned to correspond to the bolt holes between the inner face of the side face of the opposite of the steel pipe, the Back nut hardware is formed by bending a long metal plate into a trapezoidal shape
And extends from the upper side and both ends of the upper side.
Two plate-like portions, and the length of the upper side portion is two
Metal fittings set to be substantially the same as the distance between the inner surfaces of the side surfaces of
Is formed by being folded outward at the tip of the two plate-like parts, and
A locking piece that engages the lower end of the steel pipe,
At least at a position at the predetermined distance from the locking piece
A hole formed with a center, and a front corresponding to said hole
At least one nut attached to the plate-like part
Including , steel tube with back nut.