JPH10169201A - Coupling structure for threaded reinforcing bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make effective works for coupling threaded reinforcing bar with steel skeleton member or a fixing plate and decrease the number of component parts used in coupling. SOLUTION: A pair of nuts 30 are used to make coupling of each threaded reinforcing bar 20 with a steel skeleton member 10, wherein each nut 30 has an insertion part 31 in cylindrical shape and a polygonal head 32. Female threads are provided at the internal circumferential surfaces of the insertion part 31 and head 32. The nut 30 is split in two half bodies about a plane including the axis. The half bodies 30a and 30b are put together in such a way as embracing a main bar 20 on the outside of the two flanges 11 of the steel skeleton member 10, and thereby each nut 30 is formed. The nuts 30 are turned, and each insertion part 15 is fitted in a through hole 15 provided in the flange 11, and the head 32 is fastened using a wrench.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw rebar suitable for connecting a screw rebar to the steel frame of a concrete structure or connecting a fixing plate for strengthening the connection with concrete in the middle of the screw rebar. Connection structure for

[0002]

2. Description of the Related Art In a building having an SRC structure (steel frame, reinforced concrete structure), for example, columns are formed of a steel frame such as H-section steel, and beams are formed of a reinforcing bar. The rebar cage has a plurality of main bars extending in the longitudinal direction thereof, and annular bars arranged at equal intervals along the longitudinal direction and connected to the main bars. The steel frame and the reinforcing bar are connected by a joint between the column and the beam.
That is, the middle part of the main reinforcing bar passes through a through hole formed in a pair of flanges (plate portions) of the steel frame, and the main reinforcing bar is connected to the flange in this penetrating state. When the main reinforcing bar is a screw reinforcing bar, the main reinforcing bar is connected to the flange by tightening a pair of nuts screwed to the main reinforcing bar from the outside of the flange toward the flange. However, in this connection structure, after the nut is screwed into the main bar at the end, the nut must be rotated and moved to the flange of the steel frame, which takes time and labor, resulting in poor working efficiency.

[0003] In order to solve the drawback of the structure for connecting the steel frame and the reinforcing bar in the SRC structure, for example, Japanese Utility Model Application Laid-Open No. 59-8 / 1980
There is an improvement as shown in Japanese Patent No. 4113. Here, first and second nuts are used. The first nut includes a cylindrical insertion portion and a hexagonal head provided at one end of the insertion portion. A continuous female screw portion is formed on the inner periphery of the insertion portion and the head. A male screw portion is formed on the outer periphery of the insertion portion. Moreover, the first nut is divided into two parts by a plane passing through the axis. The second nut has a ring shape like a normal nut, and has a hexagonal outer periphery. In the above connection structure, the first nut is screwed into the main bar by joining the pair of halves near the flange of the steel frame. Then, the second nut is screwed onto the outer periphery of the insertion portion of the first nut to prohibit the half of the first nut from separating radially and outwardly. The screw rebar is connected to the flange using the first and second nut assemblies having such a configuration.
According to this connection structure, it is not necessary to turn the nut while turning it from the end of the main bar to the position of the flange, so that the workability is improved.

[0004] In other words, in a reinforced concrete building, a fixing metal is connected to a main reinforcing bar of a reinforcing bar cage of a beam at a connection portion between a column and a beam, thereby firmly fixing a threaded reinforcing bar to concrete. . When the main reinforcement is a screw rebar, the fixing hardware includes a nut portion screwed to the screw rebar, and a fixing plate portion extending radially and outwardly from one end of the nut portion. Also in the case of this fixing metal, after being screwed to the end of the main bar, it has to be moved to the port while rotating, and it takes time and labor, and the work efficiency is poor.

In order to solve the above-mentioned defect of the fixing hardware, Japanese Unexamined Utility Model Publication No. Sho 58-73820 discloses that a fixing hardware having a nut portion and a fixing plate portion is divided into two parts by a plane including an axis. Then, in a state where the pair of halves are combined and screwed to the main bar, the halves are connected with bolts and nuts. In this case, the fixing hardware does not need to be rotated and moved from the end of the main streak to the connection, so that the workability is improved.

[0006]

As described above, the SRC
In the structure, when the connecting structure disclosed in Japanese Utility Model Laid-Open No. 59-84113 is used, two sets of first and second nuts are required for connecting a pair of flanges of a steel frame and one main bar. , Since a total of four parts are required, the number of parts is large. In addition, it requires time and effort to screw the insertion portion of the first nut and the second nut, and there is a limit in improving the workability.

Further, the fixing hardware disclosed in Japanese Utility Model Application Laid-Open No. 58-73220 requires bolts and nuts for connecting a pair of halves, so that the number of parts is large, the structure is complicated, and the half halves are used. The connecting operation was complicated.

[0008]

According to a first aspect of the present invention, there is provided a structure for connecting a screw rebar to a connection object having a pair of parallel flat plates formed with a circular through-hole, and comprising a pair of nuts. Each nut has a cylindrical insertion portion and a polygonal head provided at one end of the insertion portion,
A female screw portion is formed on the inner periphery of the insertion portion and the head, and the nut is formed of a pair of halves divided by a plane including the axis thereof. The nut is formed by holding the screw rebar inserted through the through-hole and the pair of halves are fitted together, and the female screw portion of the nut is screwed into the screw rebar, and further, the nut By inserting the insertion portion into the through hole of the flat plate portion, the aligned state of the pair of halves is maintained, and in this state, a pair of nuts are tightened from the outside of the flat plate portion toward the flat plate portion. The screw rebar is connected to the connection target. According to a second aspect of the present invention, in the connection structure for a screw rebar according to the first aspect, the connection target is made of a steel frame, and the screw rebar is connected to a pair of flat plate portions of the steel frame. .

According to a third aspect of the present invention, there is provided a structure for connecting two fixing plates having circular through holes to a screw rebar, comprising a pair of nuts having the same configuration as the first aspect of the present invention. By holding the screw rebar inserted through the through-hole of the plate, the pair of halves are fitted to form the nut, and the female screw portion of the nut is screwed into the screw rebar, By inserting the nut insertion portions into the corresponding through holes of the fixing plate, the mating state of the pair of halves is maintained, and in this state, the pair of nuts are tightened from outside the flat plate portion toward the fixing plate. Thereby, the two fixing plates are connected to the screw reinforcing bar in a state where they are in contact with each other. According to a fourth aspect of the present invention, there is provided a structure in which a single fixing plate having a circular through hole is connected to a screw rebar, comprising a pair of nuts having the same configuration as the first aspect of the invention. A fixing plate is connected to the screw reinforcing bar. According to a fifth aspect of the present invention, in the connection structure for a screw rebar according to the third or fourth aspect,
The fixing plate is formed with a slit extending from the through hole to the outer edge of the fixing plate, and the width of the slit is equal to or larger than the outer diameter of the screw reinforcing bar and smaller than the inner diameter of the nut. Claim 6
According to the invention, in the connection structure for a screw rebar according to any one of claims 1 to 5, the insertion portion of the nut has a tapered gently tapered shape, and the outer diameter of any portion of the insertion portion is equal to the outer diameter. The diameter of the through-holes coincides with each other, and the outer peripheral surface of the insertion portion contacts the inner peripheral edge of the through-hole when the nut is tightened.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention. In this embodiment, in a building having an SRC structure, a steel frame 10 (connection target) and a main reinforcement 20 (screw reinforcement) of a reinforcing bar cage are connected. The steel frame 10 of the column is made of, for example, H-section steel, and includes a pair of parallel flanges 11 (flat portions) and a web 12 connecting the center portions of the flanges 11 in the width direction.

The reinforcing bars of beams are composed of, for example, four main reinforcing bars 20 (only one is shown in the drawing) and a number of annular reinforcing bars arranged at equal intervals along the main reinforcing bars 20 and connected to the main reinforcing bars 20. (Not shown). In addition, the main muscle 2 of the annular muscle
The connection to 0 is performed after the main bar 20 is connected to the steel frame 10 as described later. A male screw portion 21 is formed on the outer periphery of each main bar 20. In the outer periphery of the main bar 20, two locations facing each other in the radial direction are flat surfaces 22 on which the male screw portion 21 is not formed.

Next, the details of the connection structure will be described.
At the joint between the column and the beam, four flanges 11 of the steel frame 10 are formed with four circular through holes 15 (only one is shown in the figure). These two through holes 15 are formed in the left and right portions of the web 12, respectively, two vertically separated from each other.
The diameter Da of the through hole 15 is equal to the diameter Db of the main bar 20 (the male screw portion 2).
1 mountain diameter). The middle portions of the four main bars 20 pass through the through holes 15 of the pair of flanges 11 with play.

As described above, the pair of flanges 1 of the steel frame 10
Each main bar 20 penetrating 1 is connected to the flange 11 by a pair of nuts 30. As shown in FIGS. 1B and 1C, each nut 30 includes a cylindrical insertion portion 31 and a head portion 32 provided at one end of the insertion portion 31. Although the outer periphery of the insertion portion 31 has a substantially cylindrical shape, FIG.
The taper is tapered as exaggerated. This taper angle is set gently at about 5 degrees. The outer diameter of the insertion portion 31 is the flange 11 at the base end (the end on the side of the head 32).
Is slightly larger than the diameter Da of the through hole
5 is slightly smaller than the diameter Da.

The head 32 of the nut 30 has an insertion portion 31
Hexagonal shape with larger diameter. A female screw 33 (shown only in FIGS. 2 and 3) having the same pitch as the male screw 21 of the main bar 20 is formed on the inner circumference of the insertion portion 31 and the head 32. The nut 30 has a plane 2 including its axis.
Broken. A pair of halves of the nut 30 are denoted by reference numerals 30a and 30b, respectively.

Next, a procedure for connecting the main reinforcement 20 to the pair of flanges 11 of the steel frame 10 will be described. 1 (A), 2
As shown in FIG. 3, the main reinforcement 10 is connected to the through hole 1 of the flange 11.
5, a pair of nuts 30 composed of the half bodies 30a and 30b are prepared.

As shown in FIG. 1B, outside one of the flanges 11, at a position close to the flange 11,
The halves 30a and 30b are combined so as to hold the main muscle 21 with the insertion portion 31 facing the through hole 15. As a result, one nut 30 is formed, and the female screw 3
3 is screwed into the male thread portion 21 of the main bar 20.
Subsequently, while manually turning the united nut 30, FIG.
As shown in (A), the insertion portion 31 is inserted into the through hole 15. The through hole 1 in the outer periphery of the insertion portion 31
5 is inserted until the point having the same diameter as the inner peripheral edge of the through hole 15 hits. Similarly, the insertion portion 31 of the other nut 30 is inserted into the through hole 15 of the other flange 11.

When the insertion portion 31 of the nut 30 contacts the inner peripheral edge of the through hole 15 as described above, the half bodies 30a, 3
0b are forbidden to move away from each other, i.e., in the radial and outward directions.
The screwed state of b into the main bar 20 is reliably maintained, and the insertion state of the insertion portion 31 into the through hole 15 is also reliably maintained.

As described above, in a state where the insertion portions 31 of the pair of nuts 30 are fully inserted into the through holes 15 of the flange 11, the heads 32 of the pair of nuts 30 are further tightened with a spanner. As a result, the main bar 20 is firmly connected to the pair of flanges 11 so as not to move in the axial direction.
Further, the wedge effect between the through hole 15 and the insertion portion 31 is generated by the further insertion of the insertion portion 31, and the screwing between the halves 30a, 30b and the main bar 20 becomes stronger, and the connection strength of the main bar 20 is further reduced. Can be enhanced. In the tightened state, the head 32 of the nut 30 is slightly away from the flange 11, as indicated by the imaginary line in FIG. 1B and 1C, the gap between the head 32 and the flange 11 is omitted.

As described above, the half 30 of the nut 30
After the a and 30b are assembled on the main reinforcement 20 at a position close to the flange 11 of the steel frame 10, the main reinforcement 20 can be connected to the steel frame 10 by a very simple operation such as screwing into the through hole 15 and fitting. Such time and labor can be greatly reduced. In addition, since only a pair of nuts 30 composed of two halves 30a and 30b are used as members to be used, the number of parts can be reduced, and handling at a work site can be simplified.

Next, the second embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. In the second embodiment, two anchors for strengthening the adhesion to concrete are provided in the middle part of the main reinforcing bar 21 of the reinforcing bar cage having the same configuration as described above (the portion located at the joint between the column and the beam). This is a structure in which the plates 40 are connected. The nut 30 used in the present embodiment is the same as that of the first embodiment, and a detailed description thereof will be omitted.

The fixing plate 40 is formed of a square plate as shown in FIG. 5, and a through hole 41 having the same size as the through hole 15 of the flange 11 of the first embodiment is formed at the center thereof. In addition, a slit 42 is formed from the through hole 41 to the outer peripheral edge of the fixing plate 40. The width of the slit 42 is slightly larger than the diameter Db of the main bar 21 (see FIG. 2), and the outer diameter of the insertion portion 31 (the outer diameter of the smallest diameter portion at the tip).
It is set smaller than. The thickness of each fixing plate 40 is
It is longer than the length of the insertion portion 31 of the nut 30.

Next, a procedure for connecting the fixing plate 40 to the main bar 20 using the pair of nuts 30 will be described. FIG.
As shown in (A), the half bodies 30a, 30b of the nut 30
Are held together while holding the middle part of the main muscle 20. Next, the main reinforcement 20 is passed through the slit 42 of the fixing plate 40, and the through hole 41 is positioned at the main reinforcement 20. Further, the fixing plate 40 is moved in the axial direction so that the through hole 41 is
0 into the insertion portion 31. In this state, the insertion portions 31 of the pair of nuts 30 face each other, and
Are facing each other via the fixing plate 40.

Next, one nut 30 is connected to the other nut 3
0, so that the fixing plates 40 are in contact with each other as shown in FIG. In this state, nut 3
By tightening with a spanner on the head 32 of 0,
The fixing plate 40 is firmly connected to the main bar 20. In this manner, the two fixing plates 40 are connected to the main reinforcement 20 at the connection between the pillar and the beam.
The main reinforcement 20 can be firmly fixed to the concrete because the main reinforcement 20 is connected to the middle part.

According to the second embodiment, the nut 30
Has the same advantage as the first embodiment. Further, since the fixing plate 40 is also formed with the slit 42, the main reinforcement 20 can be moved in the radial direction of the main reinforcement 20, and the main reinforcement can be positioned in the through hole 41. Workability is good because it is not necessary. The advantage that the insertion portion 31 of the nut 30 is tapered is the same as in the first embodiment. When the nuts 30 are tightened, there is a gap between the tips of the insertion portions 31 of the pair of nuts 30. Although not shown in FIG. 4, there is a gap between the head 32 of the nut 30 and the fixing plate 40 in the tightened state.

FIG. 6 shows a third embodiment. Here, the fixing plate 4 thicker than the fixing plate 40 of the second embodiment is used.
0 'is used. The thickness of the fixing plate 40 'is equal to or greater than the total length of the insertion portions 31 of the pair of nuts 30. Others are second
This is the same as the fixing plate 40 of the embodiment, and has a through hole 41 and a slit (not shown). This fixing plate 40 '
Are tightened from both sides.

A female screw portion is formed on the inner periphery of the through hole of the fixing plate, and a male screw portion is formed on the outer periphery of the nut insertion portion. The fixing structure of the screw rebar can be obtained only by the fixing plate of (1), but in this case, the fixing plate is connected to the screw rebar through two screw engagements. Poor fixing strength.
Therefore, such a connection structure is outside the scope of the present invention.

The present invention is not limited to each of the above embodiments, and various forms are possible. For example, the two halves of the nut may be in surface contact with each other in a state of being screwed to the screw rebar, or may face each other with a slight gap.
The outer peripheral surface of the nut insertion portion may not be a tapered taper, but may be a complete cylindrical surface having the same diameter over the entire length. In this case, it is preferable that the insertion portion be fitted into the through hole with a small clearance. The clearance between the two needs to be at most sufficiently smaller than the thread height of the male thread of the main bar and the female thread of the nut. When the insertion portion forms a complete cylindrical surface as described above, the head of the nut contacts the flat plate portion or the fixing plate to be connected in the tightened state of the nut. The connection object may be a section steel having a rectangular cross section. The slit of the fixing plate may not be provided.

[0028]

As described above, according to the first aspect of the present invention, since the nut is divided into two parts, by combining the halves on the screw rebar at a position close to the flat portion to be connected, A nut can be attached, and workability can be improved. Moreover, since only two nuts are used, the number of parts can be reduced, the manufacturing cost can be reduced, and parts management at the work site can be simplified.
According to the second aspect of the invention, the effect of the first aspect can be enjoyed in the connection between the steel frame and the screw rebar. According to the invention of claims 3 and 4, since the nut is divided into two,
By combining the halves on the screw rebar at a position close to the place where the fixing plate is to be connected, a nut can be attached, and workability can be improved. Moreover, since only two nuts are used, the number of parts can be reduced, the manufacturing cost can be reduced, and parts management at the work site can be simplified. According to the invention of claim 5,
Since the fixing plate has a slit, the fixing plate can also be mounted on the reinforcing bar simply by moving in the radial direction in the vicinity of the expected connection position, thereby further improving workability. Claim 6
According to the invention, the insertion portion of the nut is tapered,
A wedge effect is exerted when the nut is tightened, so that the screwing strength between the nut and the rebar can be increased, and the connection strength between the rebar and the connection target or the rebar and the fixing plate can be further increased.

[Brief description of the drawings]

FIGS. 1A to 1C are cross-sectional views illustrating a process of connecting a main reinforcing bar as a screw rebar to a steel frame by a connecting structure according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the connection structure.

FIG. 3 is a front view showing a nut and a reinforcing bar having the same connection structure as viewed from a direction III in FIG. 2;

FIGS. 4A and 4B are cross-sectional views for sequentially explaining a process of connecting a pair of fixing plates to a main reinforcing bar as a screw rebar by a connecting structure according to a second embodiment of the present invention. is there.

FIG. 5 is a front view of the fixing plate of the embodiment.

FIG. 6 is a cross-sectional view showing a state in which one fixing plate is connected to a main reinforcement as a screw reinforcement by a connection structure according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Steel frame (connection object) 11 Flange (flat part) 15 Through-hole 20 Main reinforcement (screw rebar) 21 Male screw part 30 Nut 30a, 30b Half body 31 Insertion part 32 Head 33 Female screw part 40, 40 'Fixing plate 41 Penetration Hole 42 slit

Claims (6)

[Claims] 1. A structure for connecting a screw rebar to a connection object having a pair of parallel flat plates formed with a circular through hole, comprising: a pair of nuts; Department and
A polygonal head provided at one end of the insertion portion, and a female screw portion is formed on the inner periphery of the insertion portion and the head; The pair of halves are divided into two, and the pair of halves are joined by holding the screw rebar inserted through the through hole of the pair of flat plate portions,
The nut is configured, the female screw portion of the nut is screwed into the screw rebar, and the insertion portion of the nut is fitted into the through hole of the flat plate portion, so that the paired halves are maintained in a mated state. In this state, the pair of nuts are tightened from the outside of the flat plate portion toward the flat plate portion, thereby connecting the screw reinforcing bar to a connection target. 2. The connection structure for a screw rebar according to claim 1, wherein the object to be connected is a steel frame, and the screw rebar is connected to a pair of flat plates of the steel frame. 3. A structure for connecting two fixing plates having a circular through-hole to a screw rebar, comprising: a pair of nuts; each nut having a cylindrical insertion portion;
A polygonal head provided at one end of the insertion portion, and a female screw portion is formed on the inner periphery of the insertion portion and the head; The two halves are divided into two, and the pair of halves are joined together so as to hold the screw rebar inserted through the through holes of the two fixing plates.
The nut is configured, the female screw portion of the nut is screwed into the screw rebar, and the insertion portion of the nut is fitted into the corresponding through-hole of the fixing plate, so that the paired halves are aligned. In this state, a pair of nuts are tightened from the outside of the flat plate portion toward the fixing plate, whereby the two fixing plates are connected to the screw rebar in a state where they are in contact with each other. Connection structure for rebar. 4. A structure for connecting one fixing plate having a circular through hole to a screw rebar, comprising: a pair of nuts; each nut having a cylindrical insertion portion;
A polygonal head provided at one end of the insertion portion, and a female screw portion is formed on the inner periphery of the insertion portion and the head; The nut is formed by holding the screw rebar inserted into the through hole of the fixing plate and holding the pair of halves together, thereby forming the nut. The female screw portion of the nut is screwed into the screw rebar, and the insertion portion of the nut is fitted into the through hole of the corresponding fixing plate, so that the above-mentioned pair of halves is maintained in a mating state. The fixing plate is connected to the screw rebar by tightening the nuts from both sides of the flat plate portion toward the fixing plate. 5. The fixing plate according to claim 3, wherein a slit extending from the through hole to an outer edge of the fixing plate is formed, and a width of the slit is greater than an outer diameter of the screw reinforcing bar and smaller than an inner diameter of the nut. A connection structure for the screw rebar according to claim 4. 6. An insertion portion of the nut has a tapered gentle taper, and an outer diameter of any portion of the insertion portion matches a diameter of the through hole. The connecting structure for a screw reinforcing bar according to any one of claims 1 to 5, wherein an outer peripheral surface of the connecting member (13) contacts an inner peripheral edge of the through hole.