JPH11223017A - Round bar jointing and fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of simply and surely jointing and fixing two round bars and having good work efficiency. SOLUTION: A round bar jointin and fixing device 1 is so constituted that a bolt insertion hole of a round bar fixing bolt 3 passes through the direction at right angles to a round bar through hole 2c and is provided to a jointing and fixing metal fixture 2 having the round bar through hole 2c capable of easily inserting two round bars 5 and 6, a screw 3b is provided to one end of the round bar fixing bolt 3 and that a taper 3a for fixing two round bars is provided to the other end. The round bars 5 and 6 are freely inserted into the round bar through hole 2c and are positioned on both sides of the taper 3a in a state to insert the round bar fixing bolt 3 into the bolt insertion hole of the jointing and fixing metal fixture 2, a nut 4 is screwed in the screw 3b and is clamped to fix, tensile force is provided to the round bar fixing bolt 3, and two round bars 5 and 6 are respectively pushed against the round bar through hole 2c of the jointing and fixing metal fixure 2 by the taper 3a to joint and fix.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a round bar joining and fixing apparatus, and more particularly to a round bar joining and fixing apparatus for joining and fixing round steel members such as two steel rods and long bolts to which a large tensile load is applied in the longitudinal direction. Things.

[0002]

2. Description of the Related Art Round steel materials for holding a formwork for casting an angled concrete frame such as a retaining wall require different lengths for each step. It takes a delivery time to manufacture a product in search of the length of the round steel material. For this reason, there is a demand for a joining and fixing device capable of easily producing a round steel material having a predetermined length on site, and as an example of this, a steel bar joining and fixing device is disclosed in Japanese Utility Model Publication No. 7-5156.

[0003]

SUMMARY OF THE INVENTION
No. 6 discloses a steel bar joining and fixing device in which a wedge member is inserted into a screw hole of a bolt receiving member, a lower portion thereof is inserted into a small-diameter circular opening, and a tightening bolt is screwed from above the wedge member. By inserting, the wedge material descends and is press-fitted between the two steel bars, and when the tightening bolt is further tightened, the biting edge of the wedge material bites into the two steel bars and the two rods The steel material is joined and fixed, and the wedge material must be dropped into the screw hole of the receiving bracket and inserted.Therefore, it cannot be used unless the screw hole of the receiving bracket is always located at the upper position, and work efficiency is reduced. It is bad, and the place of use is also limited.

Further, since the wedge member is dropped into the screw hole of the metal fitting and inserted, the lower part of the wedge member does not always enter between the two steel bars. In some cases, it may be caught without entering between the steel materials. In this state, even if the tightening bolt is screwed in or the wedge material is pressed, it is only pressed without penetrating between the two steel bars. Cannot fix two steel bars together.

Further, when the direction of the wedge member is changed, the wedge member can be inserted between the two steel bars. However, the wedge member is inserted into the screw hole of the receiving bracket, and the direction of the wedge member can be easily changed. In addition, it is difficult to eliminate the state of being caught on two steel bars, and the workability is poor.

In addition, the wedge member comes off from the side opposite to the long nut of the fixing bracket during transportation, or falls off during installation, causing a problem that the usability is poor.

The present invention has been made in view of the above points, and has as its object to provide a round steel material joining and fixing apparatus which can easily and surely join and fix two round steel materials and has good workability.

[0008]

Means for Solving the Problems In order to solve the above problems and achieve the object, the present invention has the following constitution.

According to the first aspect of the present invention, there is provided a joint fixing metal fitting having a round steel material through-hole into which two round steel materials can be freely inserted, and a bolt for fixing a round steel material in a direction perpendicular to the round steel material through-hole. A bolt is provided through the insertion hole, a screw portion is provided at an end of the round steel material fixing bolt, and a taper portion for fixing two round steel materials is provided at the other end, and a bolt insertion hole of the joining fixture is provided. In the state where the round steel material fixing bolt is inserted, the round steel material is loosely inserted into the round steel material through hole on both sides of the tapered portion and positioned, and a nut is screwed to the screw portion and tightened and fixed, The round steel material is characterized in that a tensile force is applied to the round steel material fixing bolt, and the two round steel materials are respectively pressed against the round steel material through holes of the joining fixture by the tapered portion to be joined and fixed. Joint fixing device. ].

According to the first aspect of the present invention, the round steel material is loosely inserted into the round steel material through hole on both sides of the tapered portion in a state where the round steel material fixing bolt is inserted into the bolt insertion hole of the joining fixture. Thus, the round steel material can be easily positioned on both sides of the tapered portion. In addition, a nut is screwed into the screw portion of the round steel fixing bolt and tightened and fixed, and a tensile force is applied to the round steel fixing bolt so that the two round steel members are respectively joined by the tapered portion and the round steel material penetrates the fixing bracket. The two round steel members can be easily and reliably joined and fixed by the round steel member fixing bolts because they are pressed and fixed to the holes, and workability is good. The tapered portion of the round steel fixing bolt can be formed in a predetermined shape by a simple process of simply crushing the screwless portion by pressing.

According to a second aspect of the present invention, there is provided an apparatus for joining and fixing round steel materials according to the first aspect, wherein the joining fixture has a thick portion on a side where the nut is screwed. ].

According to the second aspect of the present invention, the side of the joining fixture to which the nut is screwed is reinforced by the thick portion, and the extra length of the round steel fixing bolt is escaped to securely tighten with the general-purpose nut. Can be fixed.

According to a third aspect of the present invention, there is provided the round steel member joining and fixing apparatus according to the first aspect, wherein a portion without an internal screw is provided on a side of the nut in contact with the joining fixture. ].

According to the third aspect of the present invention, the portion of the nut in contact with the joining and fixing bracket is provided with no internal screw so that the extra length of the round steel fixing bolt is escaped and the nut is securely tightened and fixed by the nut. it can.

According to a fourth aspect of the present invention, there is provided an apparatus for joining and fixing round steel materials according to the first aspect, wherein a projection parallel to the bolt axis direction is provided on the pressing surface of the tapered portion. ].

According to the fourth aspect of the present invention, since the projection on the pressing surface of the tapered portion is provided, a large fixing force can be obtained.

According to a fifth aspect of the present invention, there is provided a circle according to the first aspect, wherein a tip portion of the tapered portion is provided with a retaining portion which is locked in the bolt insertion hole and serves as a retaining portion. Steel joint fixing device. ].

According to the fifth aspect of the present invention, the retaining portion of the tapered portion is formed by, for example, crushing the tip of the tapered portion and enlarging the tip of the tapered portion. By screwing the nut, the retaining portion is locked in the bolt insertion hole of the joining fixture, and is prevented from coming off. Therefore, it is easy to handle because it does not disperse during transportation or handling.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a round steel member joining and fixing apparatus according to an embodiment of the present invention. First,
A first embodiment will be described with reference to FIGS.
FIG. 1 is an exploded perspective view of a round steel member fixing device, and FIG.
Is a front view of the round steel material joining and fixing device, FIG. 3 is a side view of the round steel material joining and fixing device, FIG. 4 is a front view of the joining and fixing bracket, FIG. 5 is a sectional view taken along the line VV in FIG. 4, and FIG. FIG. 7 is a front view of the round steel fixing bolt, FIG. 8 is a plan view of the round steel fixing bolt, FIG. 9 is a sectional view of the round steel fixing bolt, and FIG. 9 is a sectional view taken along line aa of FIG. 7, FIG. 9B is a sectional view taken along line bb of FIG.
(C) is a figure which shows other Embodiment as a cross section along the bb line of FIG.

The round steel material joining and fixing device 1 comprises a joining and fixing metal fitting 2, a round steel material fixing bolt 3 and a nut 4,
It is used for placing round steel members 5 and 6 for holding a formwork for casting a concrete body having an angle, such as a retaining wall, at each step.

[0021] Bolt insertion holes 2a, 2b of the joint fixture 2
Then, with the round steel material fixing bolt 3 inserted, the round steel materials 5 and 6 are loosely inserted into the round steel material through hole 2c on both sides of the tapered portion 3a, and the nut 4 is screwed into the screw portion 3b and tightened. The two round steel members 5 and 6 are respectively pressed to the round steel material through holes 2c of the joint fixing fitting 2 by the tapered portion 3a by applying a tensile force to the round steel material fixing bolts 3 so as to be joined and fixed. I have.

The joint fixture 2 is formed by welding a collar 21 to a pipe member 20. The pipe material 20 has a round steel material through hole 2c into which two round steel materials 5 and 6 can be loosely inserted, and a round steel material fixing bolt 3 orthogonal to the round steel material through hole 2c.
Bolt insertion holes 2a and 2b are provided to penetrate.
The hole 21a of the collar 21 and the bolt insertion hole 2a on the side where the collar 21 of the pipe member 20 is welded are formed to have substantially the same diameter.
The bolt insertion hole 2b on the side where the collar 21 is not welded is formed in an elliptical shape. At both ends inside the pipe member 20, protrusions 2d are provided in a ring shape, and the protrusions 2d bite into the round steel members 5, 6 to obtain a large fixing force. Protrusion 2d
Although the cross section is formed in a semicircular shape so that the round steel material can move freely and the assembling is easy, it is also possible to form the cross section in a triangular shape to ensure the fixing property. Good.

Further, on the side of the nut 4 which is in contact with the joining fixture 2, there is provided a portion where no internal screw is provided by a collar 21, which is reinforced by the collar 21 and escapes the extra length of the round steel material fixing bolt 3. The nut 4 can be securely tightened and fixed.

The round steel material fixing bolt 3 is provided with a screw portion 3b at one end thereof and a taper portion 3a at the other end for fixing two round steel materials, and the pressing surface of the taper portion 3a has a pressing surface. A pair of projections 3a1 parallel to the bolt axis direction are provided, and a large fixing force is obtained by pressing the projections 3a1 against the round steel members 5, 6. The projection 3a1 is formed as shown in FIG.
As shown in FIG. 9, the tip is sharpened.
As shown in (c), the tip may be further sharpened, so that a greater fixing force can be obtained.

When the joining fixture 2 and the round steel fixing bolt 3 are assembled, the round bar provided with the tapered portion 3a of the round steel fixing bolt 3 is formed with a threaded portion 3b, and the tapered portion 3 is formed.
a is the hole 21a of the collar 21 and the collar 21 of the pipe material 20.
Is inserted into the bolt insertion hole 2a on the side to which it is welded, and further inserted into the bolt insertion hole 2b, and the tapered portion 3a protruding from the bolt insertion hole 2b is crushed so that the tapered portion 3a does not fall out of the bolt insertion hole 2b. I do. And screw part 3
The nut 4 is screwed to the b, and the joint fixture 2, the round steel fixing bolt 3 and the nut 4 are assembled, and they are easy to handle because they do not disperse during transportation or handling.

In the state where the round steel fixing bolt 3 is inserted into the bolt insertion holes 2a and 2b of the joining fixture 2 as described above,
By loosely inserting the round steel members 5 and 6 on both sides of the tapered portion 3a into the round steel through holes 2c, the round steel members 5 and 6 can be easily positioned on both sides of the tapered portion 3a. Also,
The nut 4 is screwed into the screw portion 3b of the round steel fixing bolt 3 and tightened and fixed. A tensile force is applied to the round steel fixing bolt 3, and the two round steel members 5 and 6 are respectively rounded by the tapered portion 3a. The two round steel members 5 and 6 can be easily and reliably joined and fixed by the round steel material fixing bolt 3 because they are pressed and fixed to the steel material through hole 2c, and the tapered portion 3a of the tapered portion 3a is crushed after tightening. When the part hits the pipe material 20,
Workability is good, for example, it can be used as a mark for completion of tightening. The tapered portion 3a of the round steel material fixing bolt 3 is
A predetermined shape can be obtained by simple processing.

Tapered portion 3a of round steel fixing bolt 3
The protrusions 2d cut into the round steel members 5 and 6 to obtain a large fixing force, thereby preventing slipping, increasing strength, and rotating the nut 4 with a smaller torque. Since the tapered portion 3a has a pressing surface, it is sandwiched between two round steel members 5, 6.
Even if the nut 4 is rotated, it does not rotate.

Next, a second embodiment will be described with reference to FIGS.
5 will be described. FIG. 10 is a front view of the round steel material joining and fixing device, FIG. 11 is a bottom view of the round steel material joining and fixing device, and FIG.
Is a front view of a bolt for fixing a round steel material, and FIG.
FIG. 14 is a cross-sectional view taken along the line II-XIII, and FIG. 14 is a bottom view of a round steel member joining and fixing apparatus showing still another embodiment of the round steel member fixing bolt.

In the second embodiment, the tapered portion 3a of the round steel material fixing bolt 3 is formed by crushing a round bar by press working and cutting it into a predetermined shape. A retaining portion 3a2 that is locked by the insertion hole 2b and serves as a retaining member is provided.

[0030] The joining fixture 2 of the second embodiment.
Is the bolt insertion hole 2b on the side where the collar 21 is not welded.
However, it is formed in such a shape that the screw portion 3b and the tapered portion 3a of the round steel material fixing bolt 3 can be inserted and the retaining portion 3a2 can be locked. The round steel fixing bolt 3 is inserted into the bolt insertion hole 2b from the screw portion 3b, and is assembled by screwing the nut 4 to the screw portion 3b protruding from the collar 21 through the bolt insertion hole 2a.

Also, the retaining portion 3a2 of the tapered portion 3a
May be formed as shown in FIGS. 14 (a), 14 (b) and 14 (c), and thus the retaining portion 3a of the tapered portion 3a
2 crushes the tip of the tapered portion 3a, for example,
The retaining portion 3a2 is formed by enlarging the tip of the tapered portion and screwing the nut 4 to the round steel fixing bolt 3 locks the retaining portion 3a2 in the bolt insertion hole 2b of the joining fixture 2 to prevent the removal. Therefore, handling is easy because it does not disperse during transportation or handling.

In the second embodiment, similarly to the first embodiment, the bolt insertion holes 2a and 2b of the joint fixture 2 are provided.
Then, with the round steel material fixing bolt 3 inserted, the round steel materials 5 and 6 are loosely inserted into the round steel material through hole 2c on both sides of the tapered portion 3a, and the nut 4 is screwed into the screw portion 3b and tightened. The two round steel members 5 and 6 can be pressed and fixed to the round steel material through holes 2c of the bonding fixture 2 by applying a tensile force to the round steel material fixing bolt 3 by the tapered portion 3a. After the attachment, when the retaining portion 3a2 of the tapered portion 3a hits the pipe member 20, it is a mark that the tightening is completed.

FIGS. 15 to 17 show another embodiment of the bolt for fixing round steel, FIG. 15 is a front view of the bolt for fixing round steel, FIG. 16 is a plan view of the bolt for fixing round steel, and FIG.
FIG. 17A is a cross-sectional view of a bolt for fixing a round steel material, FIG. 17A is a cross-sectional view taken along the line aa in FIG. 15, and FIG.
It is sectional drawing in alignment with the bb line of FIG.

The bolt 3 for fixing a round steel material according to this embodiment
The tapered portion 3a is formed by cutting a round bar, the both sides 3a3 of the tapered portion 3a are cut out to form a flat projection 3a1 at the center, and two flat steel members 5 are formed by the flat projection 3a1. 6 can be pressed and fixed to the round steel material through-holes 2c of the joint fitting 2 respectively. At the tip of the tapered portion 3a, a retaining portion 3a2 which is locked by the bolt insertion hole 2b and serves as a retaining member may be provided.

The bolt 3 for fixing a round steel material is shown in FIG.
It can be formed as shown in (a), (b), (c) and (d). FIG. 18 (a) is provided with flat projections 3a1 on both sides of the tapered portion 3a, and FIG. 18 (b) is provided with acute projections 3a1 on both sides of the tapered portion 3a.
18 (c), an acute projection 3a1 is provided at the center of the tapered portion 3a, and FIG. 18 (d) shows that the projection 3a1 of the tapered portion 3a is formed at an acute angle as in FIG. 18 (c). Are formed wider than the screw portion 3b to improve the strength.

Further, the bolt 3 for fixing the round steel material is shown in FIG.
It can be formed by processing as shown in (a) and (b). In the embodiment of FIG. 19A, the straight round bar 100 is crushed by pressing to form a tapered portion 3.
a is formed, the screw portion 3b is formed by cutting or rolling, and the width L1 and L2 of the screw portion 3b and the tapered portion 3a are formed to be the same size. In the embodiment shown in FIG. 19B, the tapered portion 3a is formed by crushing the straight round bar 101 having two stages by pressing, and the screw portion 3b is formed by cutting or rolling. The width L4 of the portion 3a is formed to be larger than the width L3. Further, for example, a tapered portion is formed by crushing by a header process in which a straight round bar is put into a mold and crushed, and then the screw portion is formed by cutting or rolling.

Next, another embodiment of the joining fixture 2 is shown in FIG. In the joint fixture 2 of this embodiment, a thick portion 20c is integrally provided on the side of the pipe member 20 to which the nut 4 is screwed, and the collar 21 is constituted by the thick portion 20c. By forming the collar 21 by the thick portion 20c, the side of the joining fixture 2 to which the nut 4 is screwed is reinforced by the thick portion 20c, and the extra length of the round steel fixing bolt 3 is escaped, so that the general-purpose nut is used. 4 enables to be securely tightened and fixed. The thick part 20c of the joint fixture 2 may be further attached to the pipe member by welding or by crimping a pipe member with a projection.

Still another embodiment of the joining fixture 2 is shown in FIGS. 21 and 22. FIG. In the joint fixture 2 of the embodiment shown in FIG. 21, a spiral shape is formed on the inner wall 20d of the pipe member 20, and the slip of the two round steel members 5, 6 can be suppressed by the spiral inner wall 20d. Further, the joining fixture 2 of the embodiment shown in FIG.
Od is made octagonal to form a tapered surface, and the inner wall 20e of this tapered surface can suppress slippage of the two round steel materials 5, 6.

Next, another embodiment of the nut 4 is shown in FIG.
Shown in The nut 4 of this embodiment has a portion 4a on which no internal screw is provided on the side in contact with the joint fixture 2, and the side of the nut 4 in contact with the joint fixture 2 is reinforced by the portion 4a without internal screw. In addition, the excess length of the round steel material fixing bolt 3 can be escaped, and the nut 4 can be securely tightened and fixed.

[0040]

As described above, according to the first aspect of the present invention, the round steel material is inserted into the round steel material through hole on both sides of the tapered portion in a state where the round steel material fixing bolt is inserted into the bolt insertion hole of the joining fixture. Since it is loosely inserted, the round steel material can be easily positioned on both sides of the tapered portion. In addition, a nut is screwed into the screw portion of the round steel fixing bolt and tightened and fixed, and a tensile force is applied to the round steel fixing bolt so that the two round steel members are respectively joined by the tapered portion and the round steel material penetrates the fixing bracket. The two round steel members can be easily and reliably joined and fixed by the round steel member fixing bolts because they are pressed and fixed to the holes, and workability is good. Further, the tapered portion of the round steel fixing bolt can be formed in a predetermined shape by a simple process of simply crushing the screwless portion by pressing.

According to the second aspect of the present invention, the side of the joining fixture to which the nut is screwed is reinforced by the thick portion, and the excess length of the round steel fixing bolt is escaped to securely tighten and fix with the general-purpose nut. be able to.

According to the third aspect of the present invention, the portion of the nut in contact with the joint fixing bracket is free of the extra length of the round steel fixing bolt due to the portion where the internal screw is not provided, so that the nut can be securely tightened and fixed by the nut.

According to the fourth aspect of the present invention, since a protrusion parallel to the bolt axis direction is provided on the pressing surface of the tapered portion, a large fixing force can be obtained.

According to the fifth aspect of the present invention, a stopper portion is provided at the tip of the tapered portion to be locked by the bolt insertion hole to prevent the tape from coming off. It can be easily formed by enlarging the tip of the tapered portion, and by screwing a nut to the bolt for fixing the round steel material, the retaining portion is locked in the bolt insertion hole of the joint fixing bracket and becomes a stopper. Therefore, handling is easy because it does not disperse during transportation or handling.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a round steel material joining and fixing device.

FIG. 2 is a front view of the round steel member joining and fixing device.

FIG. 3 is a side view of the round steel member joining and fixing device.

FIG. 4 is a front view of a joining fixture.

FIG. 5 is a sectional view taken along the line VV of FIG. 4;

FIG. 6 is a bottom view of the joining fixture.

FIG. 7 is a front view of a round steel material fixing bolt.

FIG. 8 is a plan view of a round steel material fixing bolt.

FIG. 9 is a sectional view of a round steel material fixing bolt.

FIG. 10 is a front view of the round steel material joining and fixing device.

FIG. 11 is a bottom view of the round steel member fixing device.

FIG. 12 is a front view of a round steel material fixing bolt.

FIG. 13 is a sectional view taken along the line XIII-XIII in FIG.

FIG. 14 is a bottom view of a round steel member fixing device showing still another embodiment of the round steel member fixing bolt.

FIG. 15 is a front view of a round steel material fixing bolt.

FIG. 16 is a plan view of a round steel material fixing bolt.

FIG. 17 is a sectional view of a round steel material fixing bolt.

FIG. 18 is a perspective view showing another embodiment of a round steel material fixing bolt.

FIG. 19 is a perspective view showing an embodiment of processing of a round steel material fixing bolt.

FIG. 20 is a front view of the joining fixture.

FIG. 21 is a diagram showing another embodiment of the joining fixture.

FIG. 22 is a front view showing another embodiment of the joining fixture.

FIG. 23 is a cross-sectional view showing another embodiment of the nut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joining and fixing device for round steel materials 2 Joining fixture 2a, 2b Bolt insertion hole 2c Through-hole for round steel material 3 Bolt for fixing round steel material 3a Tapered portion 3b Screw portion 4 Nut 5,6 Round steel material

Claims (5)

[Claims] 1. A joint fitting having a round steel material through hole into which two round steel materials can be loosely inserted is provided by penetrating a bolt insertion hole of a round steel material fixing bolt in a direction perpendicular to the round steel material through hole. A screw portion is provided at an end of the round steel material fixing bolt, and a taper portion for fixing two round steel materials is provided at the other end, and the round steel material fixing bolt is provided in a bolt insertion hole of the joint fixing bracket. With the bolts inserted, the round steel material is loosely inserted into the round steel material through hole on both sides of the tapered portion and positioned, and a nut is screwed into the screw portion and tightened and fixed. By applying a pulling force, the tapered portion causes
A round steel material joining and fixing device, wherein each of the round steel materials is configured to be pressed and fixed to a round steel material through hole of the above-mentioned joint fixing fitting. 2. The round steel material joining and fixing device according to claim 1, wherein a thick portion is provided on the joining and fixing bracket on a side where the nut is screwed. 3. The round steel member fixing device according to claim 1, wherein a portion not provided with an internal screw is provided on a side of the nut that contacts the fixing member. 4. The round steel member fixing device according to claim 1, wherein a projection parallel to the bolt axis direction is provided on the pressing surface of the tapered portion. 5. The round steel member fixing device according to claim 1, wherein a stopper portion is provided at a tip end portion of the tapered portion to be locked by the bolt insertion hole and to prevent the bolt from coming off.