JPH1122110A - Support device for reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the handling of a steel frame beam, by providing a shorter base than the flange width of a steel frame beam fixed to the surface of the steel frame beam and a reinforcements-support member provided with the support part of the reinforcements arranged along the steel frame beam and fitted to the base. SOLUTION: A reinforcing piece 1b is provided at the center of a base body 1a with a L-shaped cross section and fixing projections 1d are provided at both ends of the vertical side 1c to form a base 1. And further, sides 4d crossing at right angles at both ends of the vertical side 4c of a protrusion-shaped body 4a are formed and fixing holes 4e are formed at the central part of the vertical side 4c. And a reinforcements-support member 4 provided with holes 4h in which bands 6 holding reinforcements are inserted, at both ends of the upper side 4f crossing at right angles with the vertical body 4a is formed. Then, the base 1 having the length which does not project to both ends, is fixed on the upper face of the steel frame beam 2 and the fixing projections 1d of the base 1 are inserted in the fixing holes 4e of the reinforcements-support member 4 and wedges 5 are inserted to fix the base and further the reinforcements 7 are fixed and supported by the bands 6 holding reinforcements. Accordingly, a wide space for keeping or transporting steel frame beams is not required and the base is not easily broken and the steel frame beam can be easily handled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an SRC beam in which a reinforcing bar is arranged around a steel beam and concrete is cast. In the SRC beam, a reinforcing bar arranged along the steel beam before concrete is cast is supported. The present invention relates to a reinforcing bar support device.

[0002]

2. Description of the Related Art FIGS. 20 and 21 show a state of use of a conventional reinforcing bar support device. FIG. 20 shows a steel beam 101 arranged in the XX direction, in which a reinforcing bar supporting member 102 having a length of L-shaped cross section protruding from both sides thereof is fixed and fixed in advance by welding or the like. FIG. 21 shows a steel beam 103 arranged in the YY direction orthogonal to the steel beam 101 in the XX direction, and a flat reinforcing bar support member 104 having a length protruding on both sides thereof is previously welded or the like. It is fixed.

[0003] Next, the operation of the above-described conventional rebar supporting device will be described. First, at a construction site, a steel beam 103 arranged in the Y-Y direction with respect to the steel beam 101 arranged in the XX direction.
And the main reinforcing bars 105 and 106 disposed along the respective steel beams 101 and 103 are connected to the reinforcing bar supporting members 102 and 1.
The main reinforcements are arranged below the steel beams 101 and 103 by a bar reinforcement (hoop reinforcement) arranged in a vertical loop (not shown) using the reinforcements 105 and 106. The steel bars are supported so as to be suspended, and then concrete is poured to cover them.

[0004] In this case, one of the cross-sectional shapes of the reinforcing bar supporting members 102 and 104 has an L-shaped cross-sectional shape and the other is different from a flat plate, so the height of the reinforcing bars 105 and 106 supported by the reinforcing bar supporting members 102 and 104 is different. The positions are different, and the reinforcing bars 105 and 106 can be arranged orthogonally to the XY directions.

[0005]

As described above, since the conventional reinforcing bar supporting device is constructed so as to be projected and fixed to both ends of the steel beam in advance as described above, the steel beam is spaced in the factory work space as shown in FIG. Since they must be installed side by side, there were the following issues. (1) A large space is required in the factory work area. (2) A large space is required for storage. (3) The storage state is unstable and involves danger. (4) A place is required for transportation, and the loading state is unstable and involves danger. (5) The load easily collapses during loading and unloading operations, which is dangerous. (6) Both ends protruding from the steel beam at the time of construction work collide with other objects and are easily damaged, and subsequent processing is very troublesome. (7) The reinforcing bars placed on the reinforcing bar supporting device are easily displaced or fall off by the time of concrete casting.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a rebar supporting device which does not have the above-mentioned conventional problems and is extremely easy to handle.

[0007]

According to a first aspect of the present invention, there is provided a reinforcing bar support device for an SRC beam in which a reinforcing bar is provided around a steel frame beam and concrete is cast. A base having a length shorter than the flange width of the steel beam, a reinforcing bar support member having a support portion of a reinforcing bar disposed along the steel beam and attached to the base, and the reinforcing bar support member being attached to the base. Mounting means for mounting.

The reinforcing bar supporting member of the reinforcing bar supporting device according to the second aspect of the present invention has a convex shape, and when mounted on the base in this convex state, the middle both ends lower than the upper surface of the convex shape are reinforced. When it is attached to the base in a reverse convex shape, it is used as a supporting portion, and both ends of the upper surface are used as reinforcing bar supporting portions.

The reinforcing bar supporting member of the reinforcing bar supporting apparatus according to the third aspect of the present invention has a convex shape, and orthogonal pieces are provided at both middle ends and both upper ends lower than the convex upper surface. Holes for inserting and locking both ends of a reinforcing bar support band for pressing and supporting a reinforcing bar are provided in the orthogonal piece.

A reinforcing bar supporting band of the reinforcing bar supporting device according to the fourth aspect of the present invention has an inverted U-shape, and has an engaging claw which is engaged with a hole edge at a tip end portion of both legs passing through the hole.

The reinforcing bar supporting member of the reinforcing bar supporting device according to the present invention has a convex shape and is provided with concave portions for positioning and holding the reinforcing bar at both ends at the middle and lower ends than the upper surface of the convex shape. Things.

According to a sixth aspect of the present invention, there is provided a reinforcing bar supporting device, wherein a positioning engaging portion is provided relatively to a mating surface between a base and a reinforcing bar supporting member.

According to a seventh aspect of the present invention, the mounting means of the reinforcing bar support device is a wedge member for sandwiching a joint between the base and the vertical piece of the reinforcing bar supporting member.

The mounting means of the reinforcing bar support device according to the invention described in claim 8 includes a projection locking portion which is formed on one of the mating surfaces of the base and the reinforcing bar supporting member, and which can be reduced in diameter. And a locking hole formed on the other surface to be locked to the hole edge at the time of penetration and restoration by reducing the diameter.

The reinforcing bar supporting member of the reinforcing bar supporting device according to the ninth aspect of the present invention is a channel body having a U-shaped cross section composed of a central piece and bent pieces formed on both sides thereof. At the both ends in the direction, a protruding piece is erected in the direction opposite to the bent piece with respect to the center piece, and a plurality of circulation holes are formed in the center piece.

According to the tenth aspect of the present invention, the mounting means of the reinforcing bar supporting device comprises an engaging projection formed by punching a vertical piece of the base and standing upright, and an engaging hole formed in the reinforcing bar supporting member.
The engaging projection is bent and fixed after being inserted into the engaging hole.

[0017]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Embodiment 1 FIG. 1 is a front view of a reinforcing bar support device according to Embodiment 1 of the present invention attached to a base of a steel beam arranged in the XX direction.
FIG. 2 is a front view of the rebar supporting device according to the first embodiment of the present invention, which is attached to a base of a steel beam arranged in the YY direction.

In FIG. 1, reference numeral 1 denotes a factory in advance.
It is a base (so-called nekopis) which is arranged in the surface width direction of the steel beam 2 and fixed by welding 3 or the like, and has a length which does not protrude to both sides of the steel beam 2. 4 is a reinforcing bar support member (so-called Kansashi) attached to the base 1 at the construction site,
Reference numeral 5 denotes a wedge member for sandwiching and integrally fixing the base 1 and the reinforcing bar support member 4 whose opposing surfaces are aligned with each other.

FIG. 3 is an exploded perspective view of a reinforcing bar supporting device when attached to a base of a steel beam arranged in the XX direction. FIG. 4 is a perspective view of the base and the reinforcing bar supporting member from the back side in FIG. FIG. 5 is a perspective view of the rebar supporting device showing a state where the rebar supporting member is attached to the base of the steel beam shown in FIG. In the figure, a base 1 is provided with a reinforcing piece 1b at the center of a main body 1a having an L-shaped cross section, and engaging projections 1d formed at both ends of a vertical piece 1c.

Further, the reinforcing bar supporting member 4 has a convex main body 4.
a perpendicular piece 4d is formed at both ends of the vertical piece 4c, and an engagement hole 4e is provided at the center of the vertical piece 4c, and a reinforcing bar support band is provided at both ends of the orthogonal piece 4d and the upper right piece 4f of the main body 4a. 6 are provided with holes 4g and 4h.

Then, the engaging projection 1d of the base 1 is inserted into the engaging hole 4e of the reinforcing bar support member 4, and the two are combined, and one leg of the wedge member 5 is connected to the hole 4i of the reinforcing bar supporting member 4 as shown in the figure. The vertical piece 1c of the base 1 and the vertical piece 4c of the reinforcing bar support member 4 are sandwiched and fixed integrally by the wedge member 5.

FIG. 6 shows a case in which the reinforcing bar support member 4 is mounted on the base 1 of the steel beam arranged in the YY direction while being turned upside down from the case of FIG. 7 is an exploded perspective view, and FIG. 7 is a perspective view showing a construction state in which the reinforcing bar supporting member 4 is attached to the base 1 of the steel beam, and the engaging projection 1d of the base 1 is changed to the engaging hole 4e of the reinforcing bar supporting member 4. And the wedge member 5 sandwiches the base 1 and the vertical pieces 1c and 4c of the reinforcing bar support member 4 to be integrally fixed.

FIG. 8 is a front view of the wedge member. The wedge member 5 has an inverted U-shape.
It is formed in a tapered curved surface to facilitate insertion into the device. FIG. 9 is a front view showing the reinforcing bar support band 6. The reinforcing bar support band 6 has an inverted U-shape, and engaging claws 6 a for outwardly engaging the hole edges are provided at the ends of both legs. .

Next, the construction operation according to this embodiment will be described. First, at the time of factory production of the steel beam 2 arranged in the XX direction and the steel beam 2 arranged in the YY direction, the base of the steel beam 2, 2 having a length that does not protrude on both sides thereof. The base 1 is fixed by welding or the like. Then, the steel beams 2, 2 are carried to the construction site and arranged in the construction state in the XX direction and the YY direction, and then, as shown in FIGS. The protrusion 1d is inserted into and engaged with the engagement hole 4e of the reinforcing bar support member 4, thereby aligning the two, and the wedge member 5 is fitted to the mating portion of the two and clamped and fixed.

Next, the upper end orthogonal piece 4f of the reinforcing bar support member 4
The reinforcing bar 7 is placed on the reinforcing bar support band 6 inserted into the hole 4h of the upper orthogonal piece 4f as shown in FIG.
To engage the tip engaging portion 6a of the reinforcing bar support band 6 with the edge of the hole to support the band.

In this case, the reinforcing steel 7 is attached to the steel beam 2 in the XX direction.
When arranging the steel beams, as shown in FIG. 11, the reinforcing bar support member 4 is attached in the same state as in FIG. 5, and the reinforcing bars are attached to the steel beam 2 in the YY direction orthogonal to the steel beam 2 in the XX direction. 12, the rebar supporting member 4 is mounted on the base 1 by turning the rebar supporting member 4 upside down in the same state as in FIG. 7 as shown in FIG. 7 is supported.

With this configuration, as shown in FIG.
The steel beam 2 in the -X direction and the steel beam 2 in the YY direction are arranged to intersect vertically. After that, using the reinforcing bars 7, 7, FIG.
As shown in FIG. 1 and FIG. 12, the main reinforcing bars arranged below the steel beams 2, 2 are supported by the band reinforcing bars arranged in a vertical loop so as to be suspended, and the entire reinforcing members are covered. Since the concrete 8 can be cast, the reinforcing bars are not displaced.

As described above, according to the first embodiment, since the base 1 previously fixed to the steel beam 2 does not protrude in the width direction of the flange, the work place, storage place, Requires no space for transportation. Further, the base 1 is less likely to be damaged by collision with other objects during transportation or handling. By mounting the rebar supporting member 4 having a convex shape upside down on the base 1, the height position at which the rebar 7 is supported can be changed, and one rebar supporting member 4 can be moved in the XX direction and the YY direction. Can be used to support the reinforcing bar 7, the number of parts used is small, and handling can be facilitated.

Embodiment 2 FIG. 14 shows a reinforcing bar support device according to Embodiment 2 of the present invention, in which a vertical piece 1 of a base 1 and a reinforcing bar support member 4 is provided.
In order to fix and hold c and 4c integrally in the aligned state,
In the first embodiment, the wedge member 5 is used. In the second embodiment, the diameter-reducible protrusion locking portion 9 formed on one of the mating surfaces of the base 1 and the reinforcing bar support member 4 is provided. By inserting into the engaging hole formed on the other surface while reducing the diameter and engaging the engaging claw 9a at the tip of the projection at the hole edge at the time of restoring the penetration, the two are assembled together in a state where the two are joined together. It is fixed.

As described above, according to the second embodiment, it is possible to hold the reinforcing bar supporting member 4 in that state only by fitting the reinforcing bar supporting member 4 to the base 1.
Does not require the wedge member 5 as a separate member for assembling and holding, the configuration can be further simplified and the cost can be reduced.

In the first and second embodiments, the reinforcing bar support band 6 is used to support the reinforcing bar 7 on the reinforcing bar support member 4.
However, as shown in FIG. 15, a concave portion 1 for engaging and holding a reinforcing bar 7 at both ends of a vertical piece 4c of a convex reinforcing bar supporting member 4 is used.
0 may be formed. In this case, the orthogonal pieces 4d and 4f become unnecessary, and the configuration of the reinforcing bar support member 4 can be simplified. In addition, the reinforcing bar support band 6 becomes unnecessary, and the construction work is simplified, and the work can be speeded up. it can.

Third Embodiment FIG. 16 is a perspective view showing a construction state of a steel beam 2 provided in a XX direction to which a reinforcing bar supporting device according to a third embodiment of the present invention is attached, and FIG. It is a disassembled perspective view which shows the construction state of the steel beam 2 arrange | positioned in the YY direction which attaches 16 reinforcing-bar support apparatuses. In the figure, a base 1 is composed of
And a vertical piece 1c and an engagement protrusion 1d, and the bottom of the main body 1a is welded in advance to the upper flange of the steel beam 2 at a factory by welding.

On the other hand, the reinforcing bar supporting member 4 attached to the base 1 at the site is composed of a channel body having a U-shaped cross section, and the channel body is formed at right angles from the central piece 4j and both end edges of the central piece 4j. It is composed of a bent piece 4k. Note that one of the bent pieces 4k and the center piece 4j are formed with respective engaging holes 41 corresponding to the distance between the engaging projections 1d of the base 1. Further, projecting pieces 4jj for preventing the reinforcing bar from falling off are provided at both ends in the longitudinal direction of the central piece 4j, and a plurality of pieces are provided between the projecting pieces 4jj for the distribution of concrete having an appropriate shape and for the distribution of air. 4m are formed. This circulation hole 4m,
This is extremely effective when the reinforcing bar support member 4 is used so as to cover the base 1 as shown in FIG.

The rebar supporting member 4 has a dual-purpose function of supporting rebar in any of the steel beams in the XX direction and the YY direction, similarly to the above-described embodiments.
That is, as shown in FIG. 16, the rebar supporting member 4 is used at a low height so as to cover the base 1, and as shown in FIG. 17, the rebar supporting member 4 is rotated 90 degrees from the state of FIG. It is possible to use it. In any case, after the attachment, the attachment is completed by bending the engagement protrusion 1d of the base 1 protruding from the engagement hole 41 of the reinforcing bar support member 4 as shown in FIG.

Fourth Embodiment FIG. 18 is an exploded perspective view showing a construction state of a steel beam arranged in the XX direction for mounting a reinforcing bar support device according to a fourth embodiment of the present invention, and FIG. FIG. 5 is an exploded perspective view showing a construction state of a steel beam installed in the YY direction to attach the reinforcing bar support device of FIG.

In the drawing, a base 1 has the same structure as that of the fourth embodiment, and is previously welded to an upper flange of a steel beam 2 at a factory by welding. The reinforcing bar support member 4 is formed of a channel body having a U-shaped cross section.
This channel body is composed of a central piece 4j and bent pieces 4k bent at right angles from both ends of the central piece 4j.

A base attachment piece 4n is provided upright at the center of the center piece 4j on the opposite side of the bent piece 4k with respect to the center piece 4j. Projection 4
An engagement hole 41 is appropriately formed corresponding to d. Further, protruding pieces 4jj are provided on both ends of the central piece 4j of the reinforcing bar support member 4 in the longitudinal direction to prevent the reinforcing bar from falling off. In consideration of the case of attachment as shown in FIG. 19, these protruding pieces 4jj are erected so that only one end protrudes more than the width of the reinforcing bar supporting member 4. Note that reference numeral 4m in the drawing indicates a plurality of circulation holes for the distribution of concrete having an appropriate shape and the distribution of air, similarly to the third embodiment.

FIG. 18 shows a reinforcing-bar supporting device when the reinforcing bar 7 is low with respect to the steel beam 2 in the XX direction. FIG. 19 shows the reinforcing-bar supporting device when the reinforcing-bar supporting member 4 has a high position of the reinforcing bar 7 with respect to the steel beam 2 in the YY direction. The rebar supporting member 4 in the present embodiment also has a dual-purpose function by enabling the rebar 7 at a higher position and the rebar 7 at a lower position to be supported.

According to the reinforcing bar supporting devices of the fourth and fifth embodiments, the number of parts can be reduced and the processing can be simplified, and the engaging projections of the base 1 can be bent and fixed after the mounting. Therefore, there is an advantage that the attachment is more robust.

[0040]

As described above, according to the first aspect of the present invention, the base fixed to the surface of the steel beam and having a length shorter than the flange width of the steel beam is disposed along the steel beam. A reinforcing bar supporting member having a supporting portion for the reinforcing bar is provided on the base, and the reinforcing member is attached to the base by mounting means, so that the base does not protrude in the width direction of the steel beam, No space is required for storage and transportation of steel beams. In addition, the base is hardly damaged during transportation or handling, and there is an effect that handling can be facilitated.

According to the second aspect of the present invention, the reinforcing bar supporting member has a convex shape, and when mounted on the base in this convex state, the middle both ends lower than the convex upper surface are connected to the reinforcing bar supporting member. When mounted on the base in an inverted convex shape, both ends of the upper surface are configured as reinforcing bar support portions, so one reinforcing bar support member supports reinforcing bars in both the XX direction and the YY direction. Therefore, there is an effect that the number of parts used is small and handling can be facilitated.

According to the third aspect of the present invention, the reinforcing bar support member is convex, and orthogonal pieces are provided at both middle end portions and upper end portions lower than the convex upper surface, and a reinforcing bar is provided on each orthogonal piece. Since both ends of the rebar supporting band for pressing and supporting are configured to be inserted and locked in the holes provided in the orthogonal pieces, the placed rebar does not displace, and the concrete can be poured accurately. There is an effect that can be done.

According to the fourth aspect of the present invention, the reinforcing bar support band is formed in an inverted U shape and has an engaging claw that engages with a hole edge at the tip of both legs passed through the hole. There is an effect that the reinforcing band can be reliably supported without the support band coming off.

According to the fifth aspect of the present invention, the reinforcing bar supporting member has a convex shape, and the reinforcing bar is positioned and held in the concave portions provided at both the middle end portions and the upper end portions which are lower than the convex upper surface. With the configuration, the configuration of the reinforcing bar support member can be simplified, and the reinforcing bar support band becomes unnecessary,
There is an effect that the construction work is simplified and the work can be speeded up.

According to the sixth aspect of the present invention, since the positioning engaging portion is provided relatively to the mating surface between the base and the reinforcing bar supporting member, there is an effect that both can be accurately assembled. is there.

According to the seventh aspect of the present invention, since the joining portion between the vertical piece of the base and the vertical piece of the reinforcing bar support member is sandwiched by the wedge member, the two are firmly integrated and fixed. There is an effect that can be.

According to the eighth aspect of the present invention, the diameter-reduced projection locking portion formed on one of the mating surfaces of the base and the reinforcing bar support member, and the projection locking portion is inserted while reducing the diameter. The base and the reinforcing bar support member are integrally fixed by the locking hole formed on the other surface to be locked to the hole edge at the time of penetration restoration, so as a separate member for assembling and holding both. This eliminates the need for the wedge member, thereby simplifying the structure and speeding up the assembling operation.

According to the ninth aspect of the present invention, the reinforcing bar supporting member is a channel body having a U-shaped cross section composed of the central piece and the bent pieces formed on both sides thereof. A protruding piece is erected in the direction opposite to the bent piece with respect to the central piece,
Further, since a plurality of flow holes are formed in the central piece, the number of parts can be reduced, the processing surface can be simplified, and the concrete and air can be flowed at the time of placing concrete.

According to the tenth aspect of the present invention, the mounting means comprises an engaging projection formed by punching out a vertical piece of the base and an engaging hole formed in the reinforcing bar support member. Is bent and fixed after being inserted into the engagement hole, so that there is an effect that the mounting of the reinforcing bar support member to the base is extremely simple and the mounting becomes strong.

[Brief description of the drawings]

FIG. 1 is a front view of a reinforcing-bar supporting device according to a first embodiment of the present invention attached to a steel beam arranged in the XX direction.

FIG. 2 is a front view of the rebar supporting device according to the first embodiment of the present invention attached to a steel beam arranged in the YY direction.

FIG. 3 is an exploded perspective view of a reinforcing bar supporting device when a reinforcing bar supporting member is attached to a base of a steel beam arranged in the XX direction.

4 is an exploded perspective view showing a base of the steel beam and a reinforcing bar support member, as viewed from the rear side in FIG. 3;

FIG. 5 is a perspective view showing a construction state in which a reinforcing bar support member is attached to a base of the steel beam shown in FIG. 3;

FIG. 6 is an exploded perspective view showing a base and a reinforcing bar supporting member when the reinforcing bar supporting member is attached to the base of the steel beam arranged in the YY direction.

FIG. 7 is a perspective view from the back side of FIG. 6 showing a construction state in which a reinforcing bar support member is attached to a base of a steel beam.

FIG. 8 is an enlarged front view showing a wedge member.

FIG. 9 is an enlarged front view showing a reinforcing bar support band.

FIG. 10 is a cross-sectional view showing a state where a reinforcing bar is pressed by a reinforcing bar support band.

FIG. 11 is a front view of a construction state in which the reinforcing steel support device of the present invention is attached to a steel beam arranged in the XX direction and concrete is poured.

FIG. 12 is a front view of a construction state in which the reinforcing steel support device of the present invention is attached to a steel beam arranged in the YY direction and concrete is poured.

FIG. 13 is a cross-sectional view of the XX to which the rebar supporting device of the present invention is attached
It is a perspective view which shows the construction state of the steel beam arranged in the direction and the steel beam arranged in the YY direction.

FIG. 14 is a sectional view of a main part showing a reinforcing bar support device according to a second embodiment of the present invention.

FIG. 15 is a front view showing another rebar supporting state.

FIG. 16 is a perspective view showing a construction state of a steel beam arranged in the XX direction to which a reinforcing bar support device according to Embodiment 3 of the present invention is attached.

17 is an exploded perspective view showing a construction state of a steel beam provided in the YY direction to which the reinforcing bar support device of FIG. 16 is attached.

FIG. 18 is an exploded perspective view showing a construction state of a steel beam provided in the XX direction for mounting the reinforcing bar support device according to the fourth embodiment of the present invention.

19 is an exploded perspective view showing a construction state of a steel beam provided in the YY direction to which the reinforcing bar support device of FIG. 18 is attached.

FIG. 20 is a front view showing a state where a conventional reinforcing bar support device is attached to a steel beam arranged in the XX direction.

FIG. 21 is a front view showing a state where the rebar supporting device of FIG. 20 is attached to a steel beam arranged in the YY direction.

FIG. 22 is a perspective view showing a storage state of a large number of steel beams to which a conventional reinforcing bar support device is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 1a Main body 1c Vertical piece 1d Engagement protrusion 2 Steel beam 4 Reinforcing bar support member 4a Main body 4c Vertical piece 4d, 4f Orthogonal piece 4e Engagement hole 4f Upper end orthogonal piece 4g, 4h, 4i Hole 4j Central piece 4jj Projection piece 4k Folded piece 4l Engagement hole 4m Flow hole 4n Base mounting piece 5 Wedge member 6 Reinforcement support band 6a Engagement claw 7 Reinforcement 8 Concrete 9 Protrusion locking portion 10 Recess

Claims (10)

[Claims] 1. An SRC beam constructed by placing a reinforcing bar around a steel beam and placing concrete therein, the base being fixed to the surface of the steel beam and having a length shorter than a flange width of the steel beam; A reinforcing-bar supporting device, comprising: a reinforcing-bar supporting member having a reinforcing-bar supporting portion disposed along a beam and attached to the base; and attaching means for attaching the reinforcing-bar supporting member to the base. 2. The reinforcing bar support member is convex, and when mounted on the base in this convex state, the middle both ends lower than the upper surface of the convex are used as reinforcing bar support portions, and the base is formed in an inverted convex shape. 2. The reinforcing bar support device according to claim 1, wherein the upper end is formed as a reinforcing bar support portion when the reinforcing bar is mounted on the reinforcing member. 3. A reinforcing bar supporting member having a convex shape, provided with orthogonal pieces at both median lower ends and upper end portions lower than the convex upper surface, and ends of the reinforcing bar supporting band for pressing and supporting the reinforcing bar at each orthogonal piece. 3. The reinforcing bar support device according to claim 2, wherein a hole for inserting and locking the portion is provided in the orthogonal piece. 4. The reinforcing bar support device according to claim 3, wherein the reinforcing bar support band has an inverted U-shape, and has an engaging claw that engages with a hole edge at a tip end portion of each of the legs passed through the hole. 5. The rebar supporting member according to claim 2, wherein the rebar supporting member has a convex shape, and a concave portion for positioning and holding the rebar is provided at both ends at a middle position lower than the upper surface of the convex shape and at both ends of the upper surface. Rebar support device. 6. The reinforcing bar supporting device according to claim 1, wherein a positioning engaging portion is provided relatively to a mating surface between the base and the reinforcing bar supporting member. 7. The reinforcing bar support device according to claim 1, wherein the attaching means is a wedge member for sandwiching a joint between the base and the vertical piece of the reinforcing bar supporting member. 8. A mounting means comprising: a projection locking portion formed on one surface of a mating surface of a base and a reinforcing bar supporting member; 2. The reinforcing bar supporting device according to claim 1, comprising a locking hole formed on the other surface to be locked to a hole edge. 9. A rebar supporting member is a channel body having a U-shaped cross section composed of a central piece and bent pieces formed on both sides thereof. 2. The reinforcing bar support device according to claim 1, wherein a projecting piece is erected in the opposite direction, and a plurality of flow holes are formed in the central piece. 10. A mounting means comprising an engaging projection formed by punching out a vertical piece of a base and an engaging hole formed in a reinforcing bar support member. 2. The reinforcing bar supporting device according to claim 1, wherein the reinforcing bar is fixed by bending.