JP2011202491A - Construction method of reinforced concrete building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a reinforced concrete building greatly reducing work processes and a cost by using a steel frame concurrently.SOLUTION: A steel framework consisting of a steel column H1 and a steel beam H2 is built in an underground beam structure constructed on base concrete 1. A form C for a wall is formed continuously to a form B for the underground beam, and corrugated steel plates 12 and 18 are fixed to the slab part and the roof part of the steel beam H2. A reinforcement 9 for a wall, a reinforcement 15 for a floor, and a reinforcement 21 for a roof are arranged to be connected together, and concrete is cast integrally to the wall part, the slab part, and the roof part. In this way, a reinforced concrete structure is constructed.

Description

  The present invention relates to a method for constructing a reinforced concrete structure using a steel frame.

  Reinforced concrete structures start from construction of foundations and underground beams and build columns, walls, floor slabs, and so on, from the lower structure to the upper structure, reinforcement, formwork, concrete placement, curing, and removal of formwork A general method is to build by repeating a series of steps. Therefore, there is a construction problem that the number of processes increases and the time and cost burden increase.

  On the other hand, a reinforced concrete structure is excellent in durability and fire resistance, and can be provided with sufficient earthquake resistance by being constructed according to an appropriate structural calculation. As one of the methods for improving the above-described problems while taking advantage of these merits, a construction method using a reinforced concrete structure and a steel structure in combination has been proposed. For example, in Patent Document 1, in a steel structure, a pair of formwork walls is constructed by a formwork unit panel, and an anchor reinforcing bar is inserted into a through-hole of a perforated plate disposed in a part of the inner formwork wall. To form a reinforced concrete wall by forming a floor plate joint that can be joined to the floor plate, fixing the inner formwork wall to the steel beam with a holding bracket, and pouring concrete into the internal space created between the formwork walls Is described.

JP 2007-162252 A

  In Patent Document 1 described above, a reinforced concrete wall is constructed in a steel structure, and the structure is mainly a steel structure, and it is not a structure that fully utilizes the features of a reinforced concrete structure. Absent.

  Therefore, an object of the present invention is to provide a method for constructing a reinforced concrete building capable of significantly shortening the work process and the cost by using a steel frame.

  The method for constructing a reinforced concrete building according to the present invention is such that a reinforcing bar for a wall is erected on an underground beam reinforcing bar arranged so as to be supported by an anchor bolt for fixing a steel member, and a heat insulating material is provided. The concrete unit is placed in the underground beam formwork formed on both sides of the underground beam rebar by the formwork unit panel, and the underground beam structure is constructed, and the steel frame member is fixed to the anchor bolt. A slab portion of the steel frame is constructed by constructing a steel frame and forming a wall form by connecting to the underground beam form by the form unit panel on both sides of the standing wall reinforcing bar. Corrugated steel sheets are laid on the floor and reinforcing bars for floors are arranged along the top surface of the corrugated steel sheets to connect with the wall reinforcing bars, and concrete is placed in the wall formwork and the floor reinforcing bars The corrugated steel plate Characterized by integrally applying a wall structure and slab structure by Da設 cleats. Furthermore, a corrugated steel sheet is laid on the roof portion of the steel frame, and a roof reinforcing bar is laid along the upper surface of the corrugated steel sheet to connect with the wall reinforcing bar, and the concrete along with the wall structure below the floor. It is characterized in that the rooftop structure is constructed in one piece. Furthermore, the member which comprises a parapet structure is supported and fixed to the said corrugated steel plate laid in the roof part. Furthermore, the floor reinforcing bar and the wall reinforcing bar are fastened by an L-shaped anchor bar.

  By having the above-described configuration, it is possible to construct a reinforced concrete structure in which the underground beam structure, the wall structure, and the slab structure are integrated in a short period of time using a steel frame as a temporary building.

  That is, formwork is formed on both sides of the wall rebars standing upright in the underground beam structure, and the slab structure corrugated steel sheet is laid and the floor rebars are laid using the steel frame, and the wall rebars and Since the floor reinforcement can be connected and the concrete of the wall structure and slab structure can be placed at once, the construction period can be greatly reduced compared to the case where the wall structure and slab structure are constructed separately as in the past. Is possible. Moreover, since the formwork used for construction of the underground beam structure and the wall structure can be used as a heat insulating material as it is, the process of removing the formwork is not required, and the work period can be shortened accordingly.

  Although the steel structure used in the framework remains as a structural material that supports the slab structure even after construction, the durability and earthquake resistance of the entire building function mainly with the reinforced concrete structure. Therefore, the strength level required for the steel member can be set low, and the cost of the steel member can be reduced.

  Moreover, since the steel structure is lightweight and strong, it is suitable for forming a relatively large space, and the degree of freedom of floor plan inside the building is improved. And since a steel frame member is manufactured beforehand in a factory and carried in to a construction site, the work days of the field concerning construction of a frame of a steel frame member can be shortened, and the influence on a construction period can be decreased.

It is process explanatory drawing regarding construction of underground beam structure. It is process explanatory drawing regarding construction of underground beam structure. It is process explanatory drawing regarding construction of underground beam structure. It is process explanatory drawing regarding construction of underground beam structure. It is process explanatory drawing regarding construction of underground beam structure. It is process description regarding construction of soil structure. It is process explanatory drawing regarding the construction to the slab structure of the 2nd floor. It is process explanatory drawing regarding the construction to the slab structure of the 2nd floor. It is process explanatory drawing regarding the construction to the slab structure of the 2nd floor. It is process explanatory drawing regarding the construction to the slab structure of the 2nd floor. It is process explanatory drawing regarding the construction to a rooftop structure. It is process explanatory drawing regarding the construction to a rooftop structure.

  Hereinafter, embodiments according to the present invention will be described in detail. The embodiments described below are preferable specific examples for carrying out the present invention, and thus various technical limitations are made. However, the present invention is particularly limited in the following description. Unless otherwise specified, the present invention is not limited to these forms.

  FIG. 1 to FIG. 5 are process explanatory diagrams regarding the construction of the underground beam structure. A plurality of anchor bolts for fixing the column base portion of the steel column are erected on the foundation concrete 1 constructed in the ground (FIG. 1). The required number of anchor bolts 2 is provided upright at a plurality of locations where the anchor pillars are fixed.

  A plurality of main bars 3 are arranged and supported and fixed between the anchor bolts 2 along the underground beam to be constructed, and a frame-shaped barb 4 attached so as to surround the main bar 3 extends in the longitudinal direction of the main bar 3. A plurality of lines are arranged at predetermined intervals along the line. Thus, the underground beam reinforcing bar A formed in a prismatic shape between the anchor bolts 2 is constructed so as to be laid sideways (FIG. 2).

  Guide members 6 in which straight grooves are formed are arranged along both sides of the built-in reinforcing bar A for underground beams, and a plurality of formwork unit panels 5 are arranged along the guide members 6 and erected. . The formwork unit panel 5 is a rectangular plate-like body, and is erected by fitting a side edge in the long side direction along a guide member 6 into a groove. As will be described later, the formwork can be formed by assembling the formwork unit panels 5 so as to be stacked in a plurality of stages without gaps in the vertical direction.

  The formwork unit panel 5 is a plate-like heat insulating material made of a foamed synthetic resin material, and is used as a formwork for placing concrete, and is formed on both sides as it is after the reinforced concrete having an underground beam structure is formed. Used as a heat insulating structure in a joined state.

  As the foamed synthetic resin material used as the heat insulating material, a known material may be used, and examples thereof include polystyrene foam, polypropylene foam, polyethylene foam, polyurethane foam, phenol foam, and acrylic foam. Moreover, a nonflammable inorganic foam material can also be used. Polystyrene foam is preferable from the viewpoints of heat insulation and processability.

  Rail-like connecting members 7 are attached to the upper surfaces of the formwork unit panels 5 erected on both sides of the underground beam reinforcing bar A, respectively. The connecting member 7 has a T-shaped cross section, and one of the protruding parts on both sides is pushed into the upper part of the form unit unit panel 5 and the other is pushed into the lower part of another form unit unit panel to be stacked. The frame unit panels are connected. A plurality of locking holes are formed in the longitudinal direction at a predetermined interval in a portion protruding to the center of the connecting member 7, and a hook-shaped holding member 8 is formed in the locking holes of the connecting members 7 on both sides. It is fitted and installed, and the holding member 8 is attached in the longitudinal direction of the connecting member 7 at a predetermined interval, so that the space between the mold unit panels 5 on both sides is held at a predetermined interval (FIG. 3).

  The lower part of another formwork unit panel 5 is inserted into the connecting member 7 fitted on the upper part of the formwork unit panels 5 on both sides which are fitted into the guide member 6 and held by the connecting member 7 and the holding member 8. By attaching and holding the connecting member 7 and the holding member 8 on the upper part of the frame unit panel 5, the mold unit unit panels 5 are assembled so as to be stacked in a plurality of stages. A plurality of mold unit panels 5 are assembled to a position higher than the underground beam rebar A to form the underground beam form B. Thus, the underground beam formwork B is formed so as to be sandwiched from both sides along the underground beam reinforcing bar A.

  In the underground beam reinforcing bar A, a wall reinforcing bar 9 is inserted and arranged from above, and is erected in the vertical direction. The wall reinforcing bars 9 are formed by arranging bar-shaped reinforcing bars vertically and horizontally in a grid pattern, and the lower part is inserted and fixed so as to penetrate the underground beam reinforcing bars A. The longitudinal direction of the reinforcing bar A for underground beams Are arranged in a plane shape (FIG. 4).

  Next, concrete is poured into the interior space formed between the underground beam formwork B, and concrete is cast up to the upper end of the underground beam formwork B, and the underground beam is placed in the placed concrete. Reinforcing bar A is buried and the underground beam structure is constructed. After the underground beam structure is constructed, the heat insulating material 10 is laid in the soil part, and the earth reinforcing bar 11 is laid on the laid heat insulating material 10 (FIG. 5). The heat insulating material 10 is a plate-like body formed from the same foamed synthetic resin material as that of the formwork unit panel 5 and is arranged without a gap in the soil portion. The interstitial reinforcing bars 11 are formed by arranging bar-shaped reinforcing bars vertically and horizontally in a grid pattern, and are arranged in a plane on the top of the heat insulating material 10.

  Concrete is poured from above into the heat insulating material 10 and the soil reinforcing bar 11 laid in the soil part, and the concrete is placed in a flat shape to construct the soil structure (FIG. 6).

  After constructing substructures such as underground beam structure and soil structure, superstructures such as wall structure, slab structure and rooftop structure are constructed. 7-10 is process explanatory drawing regarding the construction to the slab structure of the 2nd floor. First, the column base portion of the steel column H1 is fixed to the anchor bolt 2, and a steel frame such as a steel beam H2 is assembled to the steel column H1 to construct a steel frame (FIG. 7). The steel frame member is manufactured in advance in a state that can be assembled in a factory, and then carried into a construction site. Therefore, the assembling work of the steel frame can be performed in a short time using a crane or the like.

  Next, the formwork unit panels 5 are stacked on both sides of the wall reinforcing bar 9 erected in the underground beam structure and assembled by the connecting member 7 and the holding member 8 in the same manner as the underground beam formwork B. The floor wall formwork C is formed continuously with the underground beam formwork B. The formed wall form C is erected along the steel column H1. In addition, in the slab portion on the second floor of the steel frame, the corrugated steel plate 12 is installed on the upper surface of the steel beam H2 without any gap, and is fixed to the steel beam H2 by welding. At that time, if the corrugated steel plate is laid on the roof portion of the steel frame as well as the second floor portion and is fixed by welding, the working efficiency is improved. The inner wall formwork C is provided with a communication hole 13 at a position corresponding to the upper portion of the corrugated steel sheet 12 (FIG. 8).

  The gap between the corrugated steel plate 12 fixed to the steel beam H2 and the steel beam H2 is closed by embedding the filler 14 so that the concrete does not leak when the concrete is placed on the corrugated steel plate 12. . Floor reinforcing bars 15 are arranged along the corrugated steel sheet 12 on the corrugated steel sheet 12. The floor reinforcing bars 15 are formed by arranging bar-shaped reinforcing bars vertically and horizontally in a grid pattern. A horizontal end of an L-shaped anchor rebar 16 inserted through the communication hole 13 is lap-joined around the floor rebar 15, and a vertical end of the anchor rebar 16 is a wall mold. Between the frames C, it extends downward and is sandwiched and connected between two pairs of rod-shaped reinforcing bars 17 carried by holding members 8 arranged in a horizontal direction over a plurality of stages. By constructing such a reinforcing bar connection structure, the reinforced concrete having the wall structure and the reinforced concrete having the slab structure can be connected with high strength (FIG. 9).

  After assembling the wall formwork C of the first floor part and the corrugated steel plate 12 of the second floor part and connecting the wall reinforcing bar 9 and the floor reinforcing bar 15 so as to be integrated, the inside of the wall formwork C Concrete is poured into the wall, and the concrete is filled into the wall formwork C without any gaps. After the concrete is filled in the wall formwork C of the first floor portion, the concrete is poured onto the corrugated steel plate 12 of the second floor portion, and the concrete is cast to a predetermined thickness where the floor reinforcing bars 15 are embedded. The wall structure and the slab structure on the second floor are filled with concrete so as to be connected through the communication hole 13 (FIG. 10).

  As described above, the wall structure of the first floor part and the slab structure of the second floor are placed at once, and then cured for several days to construct the wall structure and the roof structure of the second floor part. Since the steel frame has already been constructed, it is possible to immediately start the construction work of the wall structure and the rooftop structure, and the construction period can be shortened.

  FIG.11 and FIG.12 is process explanatory drawing regarding the construction to the wall structure and roof structure of a 2nd floor part. First, the wall reinforcing bars 9 are extended to the height of the roof portion of the steel frame, and the wall formwork C is also formed by stacking formwork unit panels on both sides of the wall reinforcing bars 9 to the same height. On the roof part of the steel frame, the corrugated steel plate 18 is installed on the upper surface of the steel beam H2 without any gaps at the same time as the second floor part, and is fixed to the steel beam H2 by welding. The inner wall mold C is provided with a communication hole 19 at a position corresponding to the upper portion of the corrugated steel plate 18.

  The gap between the corrugated steel plate 18 fixed to the steel beam H2 and the steel beam H2 is closed by embedding the filler 20 so that the concrete does not leak when the concrete is placed on top of the corrugated steel plate 18. . On the top of the corrugated steel plate 18, a roof reinforcing bar 21 is arranged along the corrugated steel plate 18. The roofing reinforcing bar 21 is formed by arranging bar-shaped reinforcing bars vertically and horizontally in a grid pattern. A horizontal end of an L-shaped anchor rebar 22 inserted through the communication hole 19 is lap-joined around the roofing rebar 21, and a vertical end of the anchor rebar 22 is a wall mold. It extends downward between the frames C and is connected to the holding member in the same manner as the anchor reinforcing bars 16 (FIG. 11).

  Further, in the eaves portion where the roof structure protrudes outward from the wall structure (the right side portion in FIG. 11), a communication hole 18 a is formed at a position of the corrugated steel plate 18 between the wall formwork C. Then, an L-shaped anchor rebar 23 is inserted into the communication hole 18 a, the horizontal end of the anchor rebar 23 is overlapped with the roofing rebar 21, and the vertical end is overlapped with the wall rebar 9. To do. In this manner, the wall reinforcing bar 9 and the roof reinforcing bar 21 can be connected with high strength by the anchor reinforcing bar 23.

  A rod-shaped attachment member 24 is supported and fixed at the peripheral end of the corrugated steel plate 18 so as to protrude outward. A frame member 25 for constructing a parapet structure is fixed to the distal end portion of the attachment member 24.

  After assembling the wall formwork C on the second floor part and the corrugated steel plate 18 on the rooftop part and connecting the wall rebar 9 and the rooftop rebar 21 so as to be integrated, they are placed in the wall formwork C. The concrete is poured into the wall formwork C without any gaps. After the concrete is filled in the wall formwork C on the second floor, the concrete is poured onto the corrugated steel plate 18 on the rooftop, and the concrete is cast to a predetermined thickness where the rooftop reinforcing bars 21 are embedded. The wall structure and the roof structure are filled with concrete so as to be connected through the communication holes 18a and 19 (FIG. 12).

  As described above, the reinforcing bars are arranged so that the reinforcing bars are integrally connected from the underground beam structure to the wall structure, slab structure, and roof structure, and the concrete is integrally placed on the slab structure or roof structure together with the wall structure. For this reason, in the building after construction, the reinforced concrete structure exhibits sufficient durability and earthquake resistance and plays a leading role with respect to the strength of the building.

  On the other hand, the steel frame has a role as a temporary structure in performing the work such as forming the formwork, fixing the corrugated steel sheet, arranging the reinforcing bar of the superstructure, and placing the concrete, and after the construction, the slab structure and Supports the rooftop structure and plays an auxiliary role.

A Reinforcement for underground beam B Formwork for underground beam C Formwork for wall H1 Steel column H2 Steel beam 1 Foundation concrete 2 Anchor bolt 3 Main reinforcement 4 Reinforcement 5 Formwork unit panel 6 Guide member 7 Connecting member 8 Holding member 9 Wall rebar
10 Insulation
11 Reinforcing bar
12 Corrugated steel sheet
13 Communication hole
14 Filler
15 Reinforcing bar
16 Anchor rebar
17 Bar rebar
18 Corrugated steel sheet
19 Communication hole
20 Filler
21 Roof reinforcement
22 Anchor reinforcement
23 Anchor rebar
24 Mounting member
25 Frame member

Claims (4)

  Fix the wall rebars upright to the underground beam rebars that are supported by the anchor bolts that fix the steel members, and use the formwork unit panel made of heat insulating material to The concrete wall is constructed by placing concrete in the underground beam formwork formed on both sides, constructing a steel frame by fixing steel members to the anchor bolts, and standing the wall A wall formwork is formed on both sides of the reinforcing steel bar by using the formwork unit panel to form a wall formwork, and a corrugated steel sheet is laid on the slab portion of the steel frame and the top surface of the corrugated steel sheet. The floor reinforcing bars are arranged along the wall and connected to the wall reinforcing bars, and the concrete is placed in the wall formwork and the floor reinforcing bars are embedded so that the concrete is placed on the corrugated steel plate. Placing the wall structure and slab structure together How to build a reinforced concrete building, characterized in that the factory.   Corrugated steel sheets are laid on the roof part of the steel frame, and roof reinforcing bars are arranged along the top surface of the corrugated steel sheets to connect with the wall reinforcing bars, and concrete is placed together with the wall structure below the floor. Then, the construction method of the reinforced concrete structure according to claim 1, wherein the rooftop structure is integrally constructed.   The method for constructing a reinforced concrete structure according to claim 2, wherein a member constituting a parapet structure is supported and fixed on the corrugated steel sheet laid on a rooftop portion.   The method for constructing a reinforced concrete structure according to any one of claims 1 to 3, wherein the floor reinforcing bar and the wall reinforcing bar are fastened by an L-shaped anchor bar.

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