JPH07292855A - Steel encased reinforcing concrete girder - Google Patents

Abstract

PURPOSE:To improve workability, by arranging form panels at the right and left sides and the lower part of a steel skeleton respectively and fixing the skeleton and the form panels through separators. CONSTITUTION:A metallic net 10 is spread over a form frame and a transparent synthetic resin film with a number of fine holes is spread on the inner side face of the metallic net 10 to make form panels 5, 6, 7. These form panels 5, 6, 7 are arranged at the right and left sides and the lower part of the H- shaped steel skeleton and reverse U-shaped first separators 13 are arranged at every certain distance in the longitudinal direction and both ends of the separator 13 are fixed to the form panel 7. Moreover, bar type second separators 14 are arranged at every certain distance in the longitudinal direction and the lower flange S2 of the steel skeleton, the form panel 7, the web S3, and the form panels 5, 6 are connected and fixed by the separators 14, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel-framed reinforced concrete beam, and more particularly to a steel-framed reinforced concrete beam in which a formwork panel can be used as it is as a base material for an interior / exterior material of a wall after placing concrete.

[0002]

2. Description of the Related Art Conventionally, when constructing a steel-framed reinforced concrete structure, it has been common to construct columns and beams by the following means and procedures. That is, first of all, a steel column is erected on the foundation provided at a predetermined position on the construction site,
A plurality of column main reinforcements are erected around this steel column, and shear reinforcements are wound around these column main reinforcements at a predetermined pitch to arrange them, and plate form panels are arranged around these reinforcements. And assemble the formwork. Further, a steel frame beam is erected between the steel frame columns, column main bars and shear reinforcement bars are arranged around the steel frame beams, and a frame panel of a plate material is arranged around these steel bars to assemble the frame. After that, concrete is poured into these molds, and after the concrete is hardened, the molds are dismantled.

However, according to such a construction method, there is a problem that a large number of skilled craftsmen are required in order to bring in steel frames, reinforcing bars, etc. to the construction site and erection there, and there is a problem that the construction period becomes long. Since the frame panel is made of plate material, it is not possible to visually confirm the concrete placing condition from the outside, and defective placement of the concrete is found after dismantling the formwork, and as a result, it takes time to post-process. was there. Further, there is a problem that it takes time to dismantle and carry out the formwork and the supporting work after hardening the concrete.

In order to solve such a problem, there has been proposed a form unit in which the form panel can be used as it is as a base material for an interior / exterior material of a wall after placing concrete (Japanese Patent Application Laid-Open No. Hei 10). (See JP-A-5-33387 and JP-A-5-133000). In this technique, as shown in FIG. 4, each of the mold frame panels 5, 6 and 7 in the mold unit A is connected to the mold frame 9
And the metal mesh 10 stretched over the metal mesh 10 and the synthetic resin film 11 stretched on the inner side surface of the metal mesh 10 and having a large number of holes of small diameter. ，
The steel-framed reinforced concrete formwork unit A using No. 7 is brought into the construction site and built, and then concrete is placed, whereby it is used as a base material for interior and exterior materials of wall surfaces without removing the formwork panel. This makes it possible to solve the above-mentioned problems of the prior art.

In this technique, each form panel 5, 6,
7 is positioned so that the bar-shaped separator 14 fixed to the lower flange portion S2 or the web portion S3 of the steel frame S at a predetermined pitch penetrates through the center portion of the reinforcing rib 12 formed on the wire mesh 10 of each formwork panel. It is intended to suppress the bending of the formwork panels 5, 6 and 7 when placing concrete. However, when the heavy concrete is poured into the formwork, the formwork panel receives a very large pressure, and in particular, since the formwork panel 7 on the lower surface directly receives the total weight of the concrete, the received pressure is extremely great.
Despite the provision of the rod-shaped separator 14,
In reality, the deformation cannot be prevented. Therefore, the accuracy of the lower surface of the steel-framed reinforced concrete beam cannot be improved.

[0006] In order to minimize the deformation of the bottom formwork panel during such concrete pouring, the applicant has arranged the rod-shaped separator 14 on the bottom formwork panel 7 as shown in FIG. Separately from the pair of J-shaped separators 5
0 and 50 are provided to devise and implement a structure for enhancing the positioning function of the separator member. This is because the end of the pair of J-shaped separators 50, 50 on the side of the curved portion is the pair of lower main bars 1, 1.
And the other end is attached and fixed so as to penetrate the reinforcing rib 12 of the lower form panel 7. However, according to this structure, the pressure when pouring concrete into the formwork is such that the pair of J-shaped separators 50, 5 are
The lower reinforcing bars 1 and 1 and the shear reinforcing bars 2 are transmitted through 0 to deform these reinforcing bars, resulting in the deformation of the formwork panel 7 on the lower surface, and also the accuracy of the lower surface of the concrete beam cannot be sufficiently obtained. It was a thing. Further, in this structure, after the curved portion side end portions of the pair of J-shaped separators 50, 50 are respectively hung on the lower pair of main bars 1, 1, the other end is formed into the reinforcing rib 12 of the lower form panel 7. It had to be fixed through the holes provided, and its workability was poor.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned problems, and it is possible to directly use a formwork panel as a base material for an interior / exterior material of a wall surface after placing concrete. It is an object of the present invention to provide a steel-framed reinforced concrete beam that can be constructed with good workability and is highly accurate.

[0008]

In order to solve the above-mentioned problems, the steel-framed reinforced concrete beam according to claim 1 of the present invention comprises a steel frame and a plurality of main bars mounted substantially parallel to the steel frame at predetermined intervals. A plurality of shear reinforcements arranged so as to surround these main reinforcements, a form panel attached to the sides and a lower portion of the shear reinforcements at a predetermined interval, the steel frame and each form A steel-framed reinforced concrete beam having a separator member arranged so as to maintain a predetermined interval between the panel and the concrete cast into the formwork panel, wherein the formwork panel is a formwork frame. While having a wire mesh and a sheet stretched over this formwork frame, the separator member for holding the formwork panel at the lower part of the steel frame has its central portion passing through the upper surface of the upper flange of the steel frame, with both ends Serial those configured to have a plurality of generally inverted U-shaped first separator which is fixed to the side end portion side of the steel bottom of the formwork panel. The steel-framed reinforced concrete beam according to claim 2 is the steel frame-reinforced concrete beam according to claim 1, further comprising:
One end thereof is fixed to approximately the center of the lower flange of the steel frame, and the other end has a plurality of second separators fixed to the approximately center of the formwork panel below the steel frame.

[0009]

According to the steel-framed reinforced concrete beam of the first aspect, since the formwork panel has the formwork frame and the wire mesh and sheet stretched over the formwork frame, the wire mesh and the sheet are Through this, it is possible to visually confirm the placing condition of the concrete from the outside, and when a defective placing place of the concrete is found, the placing defect can be eliminated by applying as much vibration as necessary with a vibrator or the like. In addition, by using the formwork panel as it is as a base material for the interior and exterior materials of the wall surface, weathering of concrete and rust of reinforcing bars are prevented, and the mesh prevents the concrete from biting, and It is possible to prevent peeling and cracking.

Further, as a separator member for holding the formwork panel under the steel frame, the center part thereof passes through the upper surface of the upper flange of the steel frame, and both ends are fixed to the side edges of the formwork panel under the steel frame. Since a plurality of substantially U-shaped first separators are provided, when concrete is poured into the formwork, the pressure received from the concrete by the formwork panel on the lower surface is the upper part of the steel frame through the first separator. It will be received by the flange. When heavy concrete is poured into the formwork, the steel frame does not deform like rebar, therefore the lower formwork panel is firmly supported by the steel frame via the first separator and its deformation Can be suppressed. Therefore, the lower surface of the steel frame reinforced concrete beam can be accurately formed.

In addition, the first separator is attached such that its central portion is brought into contact with the upper surface of the upper flange of the steel frame, both ends are inserted into a pair of holes formed at predetermined positions of the lower frame frame panel of the steel frame, and fixed by nuts or the like. Therefore, the workability can be extremely improved as compared with the case of using the pair of J-type separators. Further, since the formwork panel of the present invention can be used as it is as a base material for interior and exterior materials of a wall after hardening of concrete, disassembling work and carrying-out work of formwork and supporting work are unnecessary.

According to the second aspect of the present invention, there is provided a plurality of steel frame reinforced concrete beams, one end of which is fixed to substantially the central portion of the lower flange of the steel frame and the other end of which is fixed to approximately the central portion of the formwork panel below the steel frame. Since the second separator is further provided, the lower formwork panel can be firmly supported by the steel frame at three positions near the side end and the center. Therefore, the deformation can be suppressed more strongly, and the lower surface of the steel-framed reinforced concrete beam can be formed more accurately.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the attached FIGS. In this embodiment, parts, portions and the like designated by the same reference numerals as those in the conventional example of FIG. 4 have the same structure. FIG. 1 shows a formwork unit A of a steel-framed reinforced concrete beam according to this embodiment, which is composed of a steel frame S, a rebar unit R, and a formwork K.

The reinforcing bar unit R includes, for example, as shown in FIG. 2, a lower unit forming body r1 and an upper reinforcing bar 2b,
2b ,. ． ． Can be configured with. The lower unit forming body r1 can be assembled in a factory, and is formed on the upper and lower flanges S1 and S2 of the steel frame S at fixed intervals, and a pair formed on the upper part of each connecting muscle 4. Is attached so as to surround at least four main bars 1 fitted and fixed in the main bar fitting recesses 4a, 4a, and the ends of the main bars 1 are hooked on the upper bar 1. It is composed of a plurality of substantially U-shaped lower reinforcing bars 2a which are arranged at a predetermined pitch in the vertical direction. Form frame panels 5, 6 and 7 are attached to the assembled lower unit forming body r1 via first and second separators 13 and 14 which will be described later, and then are installed between steel columns at a construction site. . After that, after the upper reinforcements 2b are attached to the lower reinforcement reinforcements 2a so as to sandwich them, welding,
It is fixed to each lower reinforcing bar 2a by binding or the like.

As shown in FIGS. 1 and 3, the form K is provided on the left and right side portions and the lower portion of the reinforcing bar unit R at predetermined intervals, and left and right and lower form frame panels 5 are provided. , 6 and 7. The respective form panels 5, 6 and 7 are attached to a connecting frame 8 and are connected and fixed to each other by a method such as welding or bolting.

Each of the formwork panels 5, 6 and 7 is
Form frame 9 and wire mesh 1 stretched over this form frame
0, a sheet such as a transparent synthetic resin film 11 stretched on the inner surface of the wire net 10, and a reinforcing rib 12 formed on the wire net 10. The sheet 11 such as the transparent synthetic resin film has a small diameter (for example, 0.1 to 3 m).
Many holes of m) are provided. The large number of holes each having a small diameter are for discharging the water in the cast concrete through the metal net 10 to the outside, whereby the lateral pressure received by the formwork panel can be reduced. Further, the large number of holes having a small diameter is not indispensable. For example, a water-permeable sheet may be used instead of the sheet having a large number of holes having the small diameter, and a normal hole having no holes is formed. Sheets can also be used.

Further, the lower form panel 7 has a substantially inverted U-shaped structure in order to strongly prevent the lower form panel 7 from being bent when placing concrete and to improve the accuracy of the steel reinforced concrete beam. A large number of one separator 13 are provided at predetermined intervals in the longitudinal direction. Each of the first separators 13 has a structure in which the central portion thereof passes through the upper surface of the upper flange S1 of the steel frame S and both ends are fixed near the side end portions of the lower formwork panel 7. Both ends of the first separator 13 are inserted into holes formed at predetermined positions of the reinforcing ribs 12 of the lower mold panel 7, and fixed by nuts or the like. The first separator 1
The central portion of 3 may be fixed to the upper surface of the upper flange S1 of the steel frame by spot welding or the like, but this is not essential. It does not have to be fixed as long as it is simply supported on the upper surface of the upper flange S1.

Further, in order to prevent the bending of the formwork panels 5, 6, 7 at the time of placing concrete, between the left and right formwork panels 5, 6 and the substantially central part of the steel web S3, and the lower mold. A large number of rod-shaped second separators 14 are provided between the frame panel 7 and the substantially central portion of the lower flange S2 of the steel frame.
It is provided at predetermined intervals in the longitudinal direction. These second
One end of the separator 14 is fixed by a nut or the like after being inserted into a hole formed at a predetermined position of the reinforcing rib 12 of the formwork panels 5, 6, 7 and the other end is fixed to the steel web portion S3 and It is adapted to be screwed to a connecting nut attached to substantially the center of the lower flange S2. After concrete is placed in the formwork unit A thus formed, the concrete is hardened to complete the steel reinforced concrete beam of the present invention.

According to the above-mentioned embodiment, when pouring concrete, it is possible to confirm the pouring condition of the concrete from the outside through the wire net 10 and the transparent synthetic resin film 11, and when a defective pouring place of concrete is found. Has
By vibrating as much as necessary with a vibrator or the like, this placement defect can be eliminated. In addition, by using the formwork panel as it is as a base material for the interior and exterior materials of the wall surface, weathering of concrete and rust of reinforcing bars are prevented, and the mesh prevents the concrete from biting, and It is possible to prevent peeling and cracking.

Also, as a separator member for holding the formwork panel 7 under the steel frame, its central portion passes through the upper surface of the upper flange S1 of the steel frame, and both ends are close to the side end portions of the formwork panel 7 under the steel frame. First fixed U-shape
Since a plurality of separators 13 are provided, the large pressure received from the concrete by the formwork panel 7 on the lower surface when a large weight of concrete is poured into the formwork is caused by the upper flange of the steel frame through the first separator 13. It will be accepted by S1. The steel frame S does not deform like a reinforcing bar even when a large amount of concrete is poured into the frame, and therefore the frame panel 7 on the lower surface is more firmly fixed to the steel frame S via the first separator 13. It is supported and its deformation is suppressed. Therefore, the lower surface of the steel frame reinforced concrete beam can be accurately formed.

The attachment of the first separator 13 is as follows.
The central portion of the steel frame S is applied to the upper surface of the upper flange S1 of the steel frame S, both ends thereof are inserted into a pair of holes formed at predetermined positions of the steel frame lower formwork panel 7, and fixed with nuts or the like. It can be performed with extremely good workability as compared with the case of using. Further, since the formwork panels 5, 6 and 7 used in the present invention can be used as they are as a base material for the interior / exterior material of the wall surface after the concrete is hardened, the work of disassembling and carrying out the formwork is unnecessary. It is a thing.

Further, one end thereof is a steel lower flange S2.
If a plurality of second separators 14 fixed to substantially the central portion of the lower end of the steel frame and the other ends of the second frame 14 are fixed to the central portion of the lower frame frame panel 7, the lower frame panel 7 is attached to its side end. It can be firmly supported by the steel frame S at three locations near the center and in the center. Therefore, the deformation can be suppressed more strongly, and the lower surface of the steel-framed reinforced concrete beam can be formed more accurately.

[0023]

As described above, the steel frame reinforced concrete beam according to the present invention has the following excellent effects. According to the steel-framed reinforced concrete beam according to claim 1, it is possible to confirm the concrete placing condition from the outside through the wire mesh and the transparent sheet at the time of concrete placing, and when a defective place of concrete is found, By applying as much vibration as necessary with a vibrator or the like, this placement defect can be eliminated, and workability is greatly improved. In addition, by using the formwork panel as it is as a base material for the interior and exterior materials of the wall surface, weathering of concrete and rust of reinforcing bars are prevented, and the mesh prevents the concrete from biting, and It is possible to prevent peeling and cracking.

Further, when a large amount of concrete is poured into the formwork, the formwork panel on the lower surface is firmly supported by the steel frame via the first separator, and its deformation is suppressed. Therefore, the lower surface of the steel-framed reinforced concrete beam can be accurately formed.

In addition, the first separator is attached such that its central portion is brought into contact with the upper surface of the upper flange of the steel frame, both ends thereof are inserted into a pair of holes formed at predetermined positions of the lower frame frame panel of the steel frame, and fixed by nuts or the like. Therefore, the workability can be extremely improved as compared with the case of using the pair of J-type separators. Furthermore, since the formwork panel used in the present invention can be used as it is as a base material for interior and exterior materials of the wall after hardening of concrete, disassembling work of formwork and supporting work and carrying-out work are unnecessary. Workability is greatly improved.

According to the steel frame reinforced concrete beam of the present invention, in addition to the first separator, one end of the steel frame is fixed to a substantially central portion of a lower flange of the steel frame, and the other end is a frame of the lower steel frame. By further providing a plurality of second separators fixed to the substantially central portion of the panel, the lower formwork panel can be more firmly supported by the steel frame at three positions near the side end portion and the central portion. Therefore, the deformation can be suppressed more strongly, and the lower surface of the steel frame reinforced concrete beam can be formed more accurately.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a form unit for a steel reinforced concrete beam according to the present invention.

FIG. 2 is an exploded perspective view showing an embodiment of a reinforcing bar unit.

FIG. 3 is a vertical sectional view of the mold unit.

FIG. 4 is a perspective view showing a conventional example of a form unit.

FIG. 5 is a vertical sectional view showing another example of the form unit.

[Explanation of symbols]

 1 Main Bar 2 Shear Reinforcing Bars 5, 6 Left and Right Formwork Panel 7 Lower Formwork Panel 10 Wire Mesh 11 Sheet 12 Reinforcing Rib 13 First Separator 14 Second Separator A Formwork Unit S Steel Frame S1 Upper and Lower Flange S2 Lower Flange Part S3 Web part R Reinforcing bar unit K formwork

Claims (2)

[Claims] 1. A steel frame, a plurality of main rebars which are attached substantially parallel to the steel frame at a predetermined interval, and a plurality of shear reinforcement bars arranged so as to surround these main rebars.
Form frame panels attached to the side and the lower part of the shear reinforcing bar at a predetermined interval, a separator member arranged to maintain the interval between the steel frame and each form frame panel at a predetermined length, A steel frame reinforced concrete beam having concrete cast in a formwork panel, wherein the formwork panel has a formwork frame and a wire mesh and a sheet stretched over the formwork frame, and the mold of the lower steel frame The separator member for holding the frame panel has a substantially inverted U-shaped first separator whose central portion passes through the upper surface of the upper flange of the steel frame and whose both ends are fixed to the side end portions of the lower mold frame panel. A steel reinforced concrete beam having a plurality of steel beams. 2. The separator member for holding the lower formwork panel of the steel frame further has one end fixed to substantially the central portion of the lower flange of the steel frame and the other end substantially the central portion of the lower formwork panel of the steel frame. The steel-framed reinforced concrete beam according to claim 1, comprising a plurality of fixed second separators.