JPH1122106A - Composite bending main material of concrete structure and method of constructing concrete structure using composite bending main material - Google Patents

Abstract

(57) [Summary] [Problem] To realize cost reduction, shortening of construction period, and elimination of troublesome work. SOLUTION: A composite bending main member 2 is a bending main member which is erected in concrete forming a concrete pier, for example, to secure a bending force of the concrete pier, and comprises a steel pipe 4, a core member 6, and concrete 8. It is configured. The core member 6 is formed of a reinforcing bar assembled in a column shape. That is, the four main reinforcing bars 12 are erected at the positions of the vertices of the square, and the band reinforcing bars 14 are arranged at appropriate intervals in the vertical direction with respect to the four main reinforcing bars 12. Such a core material 6 has substantially the same height as the steel pipe 4 and is housed inside the steel pipe 4. And concrete 8 in steel pipe 4
And the core material 6 is restrained by the concrete 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main bending member to be erected in concrete for forming a concrete structure and a method for constructing a concrete structure.

[0002]

2. Description of the Related Art A conventional method of constructing a reinforced concrete bridge pier as a concrete structure will be described with reference to the drawings. (A) and (B) of FIG. 5 and FIG. 6 are explanatory diagrams showing a conventional concrete pier construction method. In the conventional construction method, first, as shown in FIG. 5A, after the foundation 102 (footing portion) is constructed, the work scaffold 104 is assembled on the four outer surfaces of the concrete pier to be constructed.
Next, the worker gets on the work scaffold 104, assembles the reinforcing bars 106 such as the main reinforcing bar and the belt reinforcing bar, and then assembles the concrete form 110 using the separator and the shoring 108. Next, concrete is poured into the concrete form 110, and after the concrete is hardened, the support 108 and the concrete form 110 are dismantled and removed, and the construction of the first lift is completed. After the second lift, as shown in FIG. 5B and FIG. 6A, the same operation as the first lift is performed using the lifting machine 112, and the piers are sequentially built upward. A concrete pier 114 is constructed as shown in FIG.

FIG. 7 is a sectional plan view of a concrete pier 114 constructed in this manner. As shown in this figure, a large number of main reinforcements 116, which are main bending members, are densely arranged on the surface layer portion of the concrete pier 114, so that the concrete pier 114 has a structure to secure the bending force. A reinforcing bar 118 is arranged outside the main reinforcing bar 116, and an inner reinforcing bar 119 is provided inside the main reinforcing bar 116 to prevent the main reinforcing bar 116 from buckling.
Are arranged vertically and horizontally across the concrete pier 114. Since the main bars 116 are arranged on the surface layer and have a low degree of restraint, it is necessary to prevent buckling by the intermediate band reinforcing bar 119. In order to obtain the required strength, the interval between the intermediate belt reinforcing bars 119 is 100 cm or less in the horizontal direction and 15 cm to 30 in the vertical direction.
cm.

FIG. 8 is a sectional plan view when a concrete pier is hollow. Even in this type of concrete pier 120, the arrangement of reinforcing bars is basically the same, and a large number of main reinforcing bars 116, which are main bending members, are densely arranged on the surface layer of the concrete pier 120, and the concrete pier 12
Zero bending force is ensured. Further, a band reinforcing bar 118 is arranged outside the main reinforcing bar 116, and an intermediate band reinforcing bar 119 is disposed inside the concrete section between the opposing main reinforcing bars 116 in order to prevent the main reinforcing bar 116 from buckling. Are arranged at an appropriate interval.

[0005]

However, in such a conventional construction method, a large number of main reinforcements 116 must be arranged on the surface layer of a concrete pier, so that the construction requires a large number of personnel and a long construction period. I was In addition, middle belt rebar 1
In order to arrange the 19s, the worker had to work in a narrow space, and was forced to work. The present invention has been made to solve such a problem, and its purpose is to
An object of the present invention is to provide a composite bending main material of a concrete structure and a method of constructing a concrete structure using the composite bending main material, which realizes cost reduction, shortening of a construction period, and elimination of troublesome work.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a composite bending main member erected in concrete forming a concrete structure, wherein the main bending direction is provided inside a steel pipe. A steel core is extended in the same direction as the above, and concrete or mortar is filled inside the steel pipe. The present invention is also characterized in that the core material is composed of a plurality of reinforcing bars spaced from each other. The present invention is also characterized in that the core material is an H-beam or an I-beam.

The present invention also relates to a method for constructing a concrete structure, wherein a steel core is erected at a construction site of the concrete structure, and a steel pipe is erected by housing the core inside. Arranging a reinforcing bar at a position corresponding to the surface layer of the concrete structure, installing a formwork at a position corresponding to the surface of the concrete structure, casting concrete or mortar inside the steel pipe, Concrete is poured into a space between the formwork and the steel pipe. The present invention is also characterized in that the core material is composed of a plurality of reinforcing bars spaced from each other. The present invention is also characterized in that the core material is an H-beam or an I-beam.

In the present invention, a steel core is accommodated inside the steel pipe, and the core is restrained by concrete or mortar filled in the steel pipe, so that a high strength composite bending main material is formed. Therefore, when this composite bending main material is used, it is not necessary to arrange a large number of main reinforcing bars on the surface layer of a concrete structure as in the conventional case, and usually, a relatively small number of composite bending main materials of the present invention are arranged at intervals. It is only necessary to stand upright. Therefore, the work can be performed with a small number of personnel, and the work can be completed in a short time. Further, since the steel pipe and the inner core material play the role of preventing buckling, it is not necessary to provide an intermediate reinforcing bar, and the troublesome work of arranging the intermediate reinforcing bar in a narrow space is not required.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1A is a cross-sectional plan view showing one example of a composite bending main material of a concrete structure according to the present invention, and FIG. 1B is a side view of the same. The composite bending main member 2 shown in FIGS. 1A and 1B is, for example, a bending main member that is erected in concrete forming a concrete pier to secure the bending force of the concrete pier, and is a steel pipe. 4, core material 6 and concrete 8. In the present embodiment, the core member 6 is formed of a reinforcing bar assembled in a column shape. That is, the four main reinforcing bars 12 are erected at the vertices of the square, and these four main reinforcing bars 12
The reinforcing bars 14 are arranged at appropriate intervals in the vertical direction, and the four main bars 12 are held so as to be positioned at the vertices of a square. Such a core material 6 has substantially the same height as the steel pipe 4 and is housed inside the steel pipe 4. Then, concrete 8 is filled in the steel pipe 4 in this embodiment, and the core material 6 is restrained by the concrete 8.

As described above, the composite bending main member 2 of this embodiment is
Since the core 6 made of steel is accommodated inside the steel pipe 4, and the core 6 is restrained by the concrete 8 filled in the steel pipe 4, it has extremely high strength. Therefore, when the composite bending main member 2 is used, it is not necessary to arrange a large number of main reinforcing bars on the surface layer portion of the concrete pier as in the prior art, and usually, a relatively small number of the composite bending main member 2 of the present embodiment is used. Only need to be erected at intervals. Therefore, the work can be performed with a small number of personnel, and the work can be completed in a short time.
Further, since the steel pipe 4 and the core member 6 inside thereof play a role of preventing buckling with each other, there is no need to provide an intermediate band reinforcing bar.
The troublesome work of arranging the reinforcing bar in the narrow space becomes unnecessary.

Next, an embodiment of the method for constructing a concrete structure using the composite bending material according to the present invention will be described with reference to an example in which a concrete pier is constructed. 2A to 2D are process diagrams showing an example of a method for constructing a concrete structure using the composite bending main material of the present invention. 2A to 2C are side views, and FIG. 2D is a cross-sectional plan view. In the figure, the same elements as those in FIG. 1 are denoted by the same reference numerals.

First, as shown in FIG. 2A, a foundation 16 is constructed at a location where a concrete pier is to be constructed, a scaffold (not shown) is constructed thereon, and a reinforcing bar is assembled in a columnar shape to form a core. Material 6. Each of the core members 6 has the four main reinforcements 12 erected at the vertexes of the square as described above, and the band reinforcements 14 are arranged at appropriate intervals in the vertical direction with respect to these four main reinforcements 12. Construct by streaking. Base 16 of each core 6
The above position is more specifically as shown in FIG. That is, four core members 6 are arranged at intervals on the inside of the long side 20 along each of the opposed long sides 20 of the rectangular cross section of the concrete pier 18.

Thereafter, as shown in FIG. 2 (B), the steel pipe 4 is lifted by a lifting machine (not shown), and
The steel pipe 4 is erected with the core material 6 housed inside. Further, in the present embodiment, as shown in FIG. 2D, one inside of each of the opposed short sides 22 of the rectangular cross section of the concrete pier 18 and approximately one center at the long side 20, The steel pipe 4 that does not accommodate the core 6 is erected.

Next, as shown in FIG. 2C, a reinforcing bar 24 is disposed at a position corresponding to the surface layer of the concrete pier at appropriate intervals in the vertical direction. Then, formwork 27 is installed at a position corresponding to the surface of the concrete pier,
The composite bending main material 2 is formed by casting concrete inside each steel pipe 4, and concrete 8 is cast in the space between the formwork 27 and the steel pipe 4. Thereafter, the concrete 8 is cured, and when the concrete 8 is hardened, the formwork 27 is removed, and the construction of the first lift of the concrete pier 18 is completed. Even after the second lift, the core material 6 and the steel pipe 4 are added to each core material 6 and the steel pipe 4 using a lifting machine, and the same operation is repeated to complete the concrete pier.

As described above, in the method of constructing a concrete structure using the composite bending main member of the present embodiment, the steel core 4 is housed inside the steel pipe 4, and the core 6 is filled in the steel pipe 4. Each composite bending main member 2 is formed by being constrained by the concreted concrete 8, so that each composite bending main member 2 has extremely high strength. Therefore, it is not necessary to arrange a large number of main reinforcements on the surface layer of the concrete pier as in the related art, and only a relatively small number of composite bending main members 2 need to be erected at intervals. Therefore, the work can be performed with a small number of personnel, and the work can be completed in a short time. Further, since the steel pipe 4 and the core member 6 inside thereof play a role of preventing buckling mutually, there is no need to provide an intermediate band reinforcing bar, and the troublesome work of arranging the intermediate band reinforcing bar in a narrow space is unnecessary. . In this embodiment,
As shown in FIG. 2D, two steel pipes 4 at the center on both sides are provided.
The core material 6 is not provided inside the pier, but this is to adjust the amount of steel material necessary for securing the bending force of the concrete pier 18. That is, if a sufficient bending reaction force can be secured without installing the core material 6 in some steel pipes 4, the core material 6 may be deleted as shown in FIG. In the embodiment, the amount of the steel material can be easily adjusted depending on whether or not the core material 6 is installed.

Although the case where the solid concrete pier 18 is constructed as shown in FIG. 2 (D) has been described here, the method of constructing a concrete structure using the composite bending main material of the present invention is described below. As shown in the sectional plan view of FIG. 3, the present invention can be applied to the case where a hollow concrete pier 26 is constructed.
And the same effect is obtained. The work procedure is basically the same as that described above. The steel pipes 4 for accommodating the core members 6 are erected inside the respective sides of the rectangular outer cross section of the concrete pier 26 with an interval, and the reinforcing bars 24 are arranged. Streaks and formwork 27A, 2
After installation of 7B, concrete 8 is cast in steel pipe 4 and between formwork 27A and 27B.

In each of the above embodiments, the core member 6 is formed of a reinforcing steel bar assembled in a columnar shape. As shown in the cross-sectional plan view of FIG. 1), for example, the H-shaped steel 30 and the I-shaped steel 3 arranged concentrically with the steel pipe inside the steel pipe 4.
2 can also be used, and in this case also, a high-strength composite bending main material can be formed as in the above-described case. In each of the above embodiments, concrete is filled inside the steel pipe in each case. However, mortar can be used instead of concrete. Material can be configured. Then, when assembling the rebar into a pillar shape to form the core material, the core material is assembled in advance at a location different from the concrete structure construction site, and the core material is transported to the concrete structure construction site, and a lifting machine is used. It is possible to increase the efficiency of the work by adopting the method of using and installing. In addition, the order of placing concrete or the like in the steel pipe 4 and placing concrete in the formwork is arbitrary. Even if the placing of concrete or the like in the steel pipe 4 is performed first, It may be performed simultaneously or simultaneously. Further, in the embodiment, the case where the cross section of the steel pipe 4 is circular has been described. However, the present invention is not limited to the circular cross section of the steel pipe 4, but may be applied to a rectangle such as a square or a rectangle. Furthermore, when constructing a concrete structure based on the present invention, a method is used in which a formwork body made of precast concrete is used as a formwork, and after casting the concrete, the formwork body is directly used as a surface portion of the concrete structure. It is also effective to adopt it, in which case the efficiency of the work can be further improved. The composite bending main material of the concrete structure of the present invention and the method of constructing a concrete structure using the composite bending main material of the present invention are not limited to concrete bridge piers, and can be applied to various concrete structures to enjoy the effects. Can be.

[0018]

As described above, according to the present invention, a steel core is accommodated inside a steel pipe, and the core is restrained by concrete or mortar filled in the steel pipe. The main material is formed. Therefore, when this composite bending main material is used, it is not necessary to arrange a large number of main reinforcing bars on the surface layer of a concrete structure as in the conventional case, and usually, a relatively small number of composite bending main materials of the present invention are arranged at intervals. It is only necessary to stand upright. As a result, work can be performed with a small number of personnel, so that costs can be reduced,
Moreover, the work can be completed in a short time. Further, since the steel pipe and the inner core material play the role of preventing buckling, it is not necessary to provide an intermediate reinforcing bar, and the troublesome work of arranging the intermediate reinforcing bar in a narrow space is not required. Also, if a sufficient bending reaction force can be secured, a configuration may be adopted in which a core is not installed in a part of the plurality of steel pipes erected in the concrete, and therefore, depending on whether the core is installed or not, The amount of steel used can be easily adjusted.

[Brief description of the drawings]

FIG. 1A is a cross-sectional plan view showing one example of a composite bending main material of a concrete structure according to the present invention, and FIG. 1B is a side view of the same.

FIGS. 2A to 2D are process diagrams showing an example of a method for constructing a concrete structure using the composite bending main material of the present invention.

FIG. 3 is a sectional plan view showing a hollow concrete pier.

4A is a cross-sectional plan view of a composite bending main material when an H-shaped steel is used, and FIG. 4B is a cross-sectional plan view of a composite bending main material when an I-shaped steel is used.

FIGS. 5A and 5B are explanatory views showing a conventional method for constructing a concrete pier.

FIGS. 6A and 6B are explanatory views showing a conventional method of constructing a concrete pier.

FIG. 7 is a sectional plan view of a concrete pier.

FIG. 8 is a cross-sectional plan view when the concrete pier is hollow.

[Explanation of symbols]

 2 Composite Bending Material 4 Steel Pipe 6 Core Material 8 Concrete 10 Reinforcement 12 Main Reinforcement 14, 24 Band Reinforcement 16 Foundation 18, 26 Concrete Bridge Pier 30 H Section Steel 32 I Section Steel

Claims (6)

[Claims] 1. A composite bending main member erected in concrete forming a concrete structure, wherein a core member made of a steel material extends inside a steel pipe in the same direction as the steel pipe extends. A composite bending main member for a concrete structure, wherein the steel pipe is filled with concrete or mortar. 2. The composite bending main member of a concrete structure according to claim 1, wherein said core member is composed of a plurality of reinforcing bars spaced from each other. 3. The composite bending main material of a concrete structure according to claim 1, wherein said core material is an H-beam or an I-beam. 4. A method for constructing a concrete structure, comprising: erecting a core made of a steel material at a location where the concrete structure is constructed; Arranging a reinforcing bar at a position corresponding to a surface layer portion of a structure, installing a formwork at a position corresponding to the surface of the concrete structure, placing concrete or mortar inside the steel pipe, And placing concrete in a space between the steel pipe and the steel pipe. A method for constructing a concrete structure using a composite bending main material, comprising: 5. The method for constructing a concrete structure using a composite bending main material according to claim 4, wherein said core material comprises a plurality of reinforcing bars arranged at intervals. 6. A method for constructing a concrete structure using a composite bending main material in which the core material is an H-beam or an I-beam.