JP2013221341A - Construction method for reinforced concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method for a reinforced concrete structure for enabling a shorter construction period.SOLUTION: Reinforcement work for beams 52 on a N+1th floor and form work for a floor on the N+1th floor are performed in prior to another work, and reinforcement work for the beams 52 on the N+1th floor and the installation of forms, reinforcement work for walls on a Nth floor and the installation of forms of the walls and columns, reinforcement work for the floor on the N+1th floor, and reinforcement work for columns 51 are performed collaterally at the same time.

Description

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

  Conventionally, as a method of constructing a reinforced concrete structure such as a building, construction is sequentially performed from a lower floor. If the construction of the lower floor does not proceed to some extent, the construction cannot be shifted to the construction of the upper floor, and there is a limit to shortening the construction period.

  On the other hand, a construction method as disclosed in Patent Document 1 has been proposed. In this conventional method, a wall formwork is supported so as to sandwich a reinforcing bar in a facing steel frame part that has been erected in advance, and a half precast floor slab is placed thereon, and the floor on the half precast floor slab is placed. The concrete placement of the slab and the concrete placement in the formwork for both walls are performed. As described above, the construction period is shortened because the steel structure part is constructed in advance.

JP 11-336327 A

  However, the construction method disclosed in Patent Document 1 relates to a composite structure of a steel frame and reinforced concrete as described above, and the reinforced concrete is provided at a position between the columns of the steel frame. Therefore, in the case of reinforced concrete only structure, it is necessary to work on the floors and pillars of the upper floor after completing the reinforcement work and formwork attached to the lower floor pillars and walls and the upper floor beams. The construction method of patent document 1 cannot be applied to the structure of only reinforced concrete.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to provide a method for constructing a reinforced concrete structure that can shorten the construction period compared with a conventional method for constructing a reinforced concrete structure.

In order to achieve the above object, according to the present invention, when a reinforced concrete structure is constructed, the N + 1 floor beam reinforcement work and the N + 1 floor form work are performed prior to other works.
Thereby, rebars or formwork for the walls of the lower floor (N floor), beam formwork for the upper floor (N + 1 floor), rebar work for the floor and pillar, etc. can be performed in parallel. Therefore, after completion of lower floor pillars, wall rebars or formwork, the construction period should be shortened compared to conventional construction methods in which upper floor beams, floor rebars or formwork are performed in order. Can do.

  In the construction method, following the N + 1 floor beam reinforcement work and the N + 1 floor construction work, the N floor reinforcement work, N floor work work, N floor pillar type At least two of the frame work and the N + 1 floor beam form work, the N + 1 floor rebar work, and the N + 1 floor rebar work may be performed simultaneously.

  In the above construction method, the N + 1 floor rebar work and the N + 1 floor form work are performed simultaneously with the N floor wall rebar work, the N floor wall form work, and the N floor pillar form work. At least one of construction, N + 1 floor beam formwork, and N + 1 floor reinforcement work may be performed.

In the above construction method, after assembling a reinforcing bar set constituting a beam outside the reinforced concrete structure, the reinforcing bar set may be installed at a predetermined position.
In this way, the reinforcing bar set can be easily assembled outside the structure, and the reinforcing bar set can be easily installed at a predetermined position by a crane or the like. Therefore, the work period can be shortened. Here, the predetermined position refers to the position of a beam between columns, the position of a small beam spanned between the beams, and the like.

  In the construction method, the beam may have precast concrete that extends in an extending direction of the beam and constitutes a bottom surface of the beam, and beam bars provided on the precast concrete.

  As described above, according to the present invention, it is possible to shorten the work period of the reinforced concrete structure.

(A) And (b) is a schematic block diagram which shows the construction method of the reinforced concrete structure of 1st Embodiment in order. (A) And (b) is a schematic block diagram which shows the construction method of the reinforced concrete structure following FIG.1 (b) in order. The principal part side view which expands and shows the construction state of the beam reinforcement in the construction method of Fig.1 (a). Sectional drawing in the 4-4 line | wire of FIG. The partial perspective view which expands and shows the truss reinforcement in the beam of FIG. Sectional drawing which decomposes | disassembles and shows a part of beam of FIG. (A) is sectional drawing which shows the 1st modification of the beam in the construction method of 1st Embodiment. (B) is sectional drawing which decomposes | disassembles and shows a part of the beam. (A) is sectional drawing which shows the 2nd modification of the beam in the construction method of 1st Embodiment. (B) is sectional drawing which decomposes | disassembles and shows a part of the beam. (A) is sectional drawing which shows the 3rd modification of the beam in the construction method of 1st Embodiment. (B) is sectional drawing which decomposes | disassembles and shows a part of the beam. (A) is sectional drawing which shows the 4th modification of the beam in the construction method of 1st Embodiment. (B) is sectional drawing which decomposes | disassembles and shows a part of the beam. Sectional drawing of the beam used for the construction method of the reinforced concrete structure of 2nd Embodiment. The fragmentary sectional view in the 12-12 line | wire of FIG. Sectional drawing of the beam used for the construction method of the reinforced concrete structure of 3rd Embodiment. FIG. 14 is a partial cross-sectional view taken along line 14-14 in FIG. 13. Sectional drawing of the beam used for the construction method of the reinforced concrete structure of 4th Embodiment. Sectional drawing of the beam used for the construction method of the reinforced concrete structure of 5th Embodiment. Sectional drawing of the beam used for the construction method of the reinforced concrete structure of 6th Embodiment.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.
(First embodiment)
First, the construction method of a reinforced concrete structure is demonstrated. As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the lower floor of the building is the N (integer) floor and the upper floor is the N + 1 floor. FIG. 1A shows a state in which the column reinforcement 21 of the column 51 on the N floor is constructed. In this state, the beam bars 22 are first assembled outside the building. Next, as shown in FIG. 1B, the beam 22 is installed at the position between the upper ends of the N-th column pillars 21, that is, at the position of the beam 52 on the (N + 1) th floor. Reference numeral 61 in the drawing denotes a hoop line.

  Here, the bottom of the concrete casting form of the beam 52 is formed of precast concrete (hereinafter simply referred to as PC) 31 made of a single plate shown in FIGS. The beam 22 is installed on the PC 31 in the vicinity of the outside of the building, and is then lifted together with the PC 31 by a crane or the like and installed at the position of the beam 52. Reference numeral 24 denotes a support for supporting the PC 31 (or the bottom frame of the beam form when no PC 31 is present).

  Also, before and after this, as shown in FIG. 1 (b), a floor plate 25 as a floor member made of half precast concrete is used for the horizontal construction surface surrounded by the beam bars 22 of the N + 1 floor. Lay. The floor plate 25 constitutes a floor formwork.

  Next, as shown in FIGS. 2 (a) and 2 (b), in the Nth floor, the arrangement of the reinforcing bars (not shown) between the columns 51, the installation of the molds 26 around the column reinforcing bars 21 and on both sides of the wall The side formwork (not shown) is installed on the side of the beam reinforcement 22 on the N + 1 floor, the wall reinforcement (not shown) between the column bars 21 and the formwork of the wall are installed.

Further, following the completion of the laying of the floor board 25, the reinforcing bars as the floor members and the column bars 21 are arranged on the floor board 25 on the (N + 1) th floor.
It should be noted that at least two of the arrangement of the reinforcing bars on the N floor, the installation of the wall formwork, the installation of the pillar form, the arrangement of the reinforcing bars on the floor plate 25 on the N + 1 floor, and the arrangement of the column reinforcement 21 on the N + 1 floor are performed simultaneously It is preferable to carry out in parallel from the viewpoint of shortening the construction period. Alternatively, at the same time as the installation of the beam bars 22 and the floor board 25 of the N + 1 floor, the arrangement of the reinforcing bars of the N floor, the installation of the wall formwork, the installation of the pillar formwork, the arrangement of the reinforcing bars on the floor board 25 of the N + 1 floor At least one of the above may be performed in parallel. Further, the arrangement of the N-level column bars 21 may be performed simultaneously with the installation of the N + 1-level beam bars 22 and the floor board 25.

  Thereafter, in the state of FIG. 2A or 2B, concrete is placed on the N-th column 51 and the wall, the N + 1-th beam 52, and the floor plate 25. The PC 31 constituting the bottom plate of the formwork of the beam 52 is buried and forms the concrete bottom surface of the beam 52.

As described above, according to the method for constructing the reinforced concrete structure, at least the reinforcement work for the beam 52 on the N + 1 floor and the formwork work for the floor on the N + 1 floor are performed in advance.
Next, the structure and construction method of the beam 52 will be described in detail.

As shown in FIGS. 3 to 6, the beam 52 includes a beam line 22 and a single-plate (flat plate) PC 31 that also serves as a beam bottom mold attached to the bottom surface of the beam.
A truss bar 33 made of a reinforcing bar is erected on the rectangular concrete portion 31 a of the PC 31. As shown in FIG. 5, each truss bar 33 has a wave shape and a plurality of pairs (two pairs in the embodiment) of lattice bars 33 a extending in the longitudinal direction of the concrete portion 31 a, and both lattice bars 33 a. It is joined between the wave heads, and is joined to one upper end bar 33b as a first end bar extending in the longitudinal direction of the concrete part 31a and the inner side of the lower end of the waveform of each lattice bar 33a. A plurality of lower end bars 33c as second end bars extending in the longitudinal direction of the portion 31a and a plurality of bars which are joined in a erected state at predetermined intervals across the lower end bars 33c and extend in the short direction of the concrete portion 31a. And the laying bar 33d. And the lower end part of the waveform of each lattice line 33a, each lower end line 33c, and each installation line 33d are embed | buried in the concrete part 31a.

  As shown in FIGS. 3, 4, and 6, the reinforcing bar set 32 of the beam 22 has a plurality of main bars 34 extending in parallel to the length direction of the beam 22 and a predetermined interval in a state of surrounding the main bars 34. It is arranged at intervals, and is constituted by a plurality of stirrups 35 and a binding state by a binding line. Each stirrup 35 is inserted inside the truss bar 33 on the PC 31 and opened upward, and the lower first divided piece 35A constituting the horizontal band and the opening of the first divided piece 35A. The upper second divided piece 35 </ b> B that opens downward to cover the end is divided. On both sides of the opening end of the first divided piece 35A, locking portions 35a that can be locked to the main bars 34 located at the upper ends of both sides are bent.

  The PC 31 having the truss bars 33 is manufactured at a factory and is carried into a construction site. Further, the reinforcing bar set 32 is arranged on the truss bar 33 while passing the split pieces 35A and 35B inside the truss bar of the PC 31 outside the reinforced concrete structure at the construction site.

Therefore, according to this embodiment, the following effects can be obtained.
(1) In the embodiment, the reinforcement work for the beam 52 on the N + 1 floor and the formwork work for the floor on the N + 1 floor are performed prior to the other work. Therefore, the installation of the form of the beam 52 on the N + 1 floor, the rebar construction of the wall on the N floor and the installation of the form of the wall and pillar, the reinforcement of the floor on the N + 1 floor, and the reinforcement of the column 51 It is possible to carry out simultaneously in parallel and shorten the construction period.

  (2) In the embodiment, when the reinforced concrete structure having the beam reinforcement 22 is constructed, the beam reinforcement 22 constituting the beam reinforcement 22 is assembled outside the structure, and then the beam reinforcement 22 is installed between the column reinforcements 21. I am doing so. For this reason, the beam bars 22 can be easily installed between the column bars 21 while being suspended by a crane or the like. On the other hand, when the beam bars 22 are arranged at the position of the beam, the work is complicated because it is an aerial work or a work in a narrow space in the formwork. Therefore, in this embodiment, the installation of the reinforcing bar set 32 constituting the beam bars 22 and the operation of arranging the beam bars 22 between the column bars 21 can be performed efficiently, and the construction period can be shortened. . Further, by arranging the reinforcing bars at the construction site, it is not necessary to transport the large bulky reinforcing bar set 32 by using a transportation means such as a truck, so that it is possible to reduce labor and cost for that purpose. Therefore, according to this embodiment, the construction cost of a building can be reduced.

  (3) In this embodiment, the bottom surface of the beam is composed of PC31. For this reason, by installing the reinforcing bar set 32 on the upper side of the PC 31, the beam 52 can be easily formed using the PC 31 as a formwork, which contributes to a reduction in construction cost.

  (4) In this embodiment, since PC31 is comprised with the simple flat concrete part 31a and the truss reinforcement 33, it is not bulky. For this reason, it does not take time and labor for transportation and storage, and the space required for it is also reduced. Therefore, the construction cost can be reduced also from this point.

(Example of change)
Next, first to fourth modification examples of the embodiment will be described.
In the first modified example shown in FIGS. 7A and 7B, almost the same as in the case of the above embodiment, the stirrup 35 constituting the reinforcing bar set 32 is a lower first opening that opens upward. It is divided into a divided piece 35A and an upper second divided piece 35B that opens downward. On both sides of the opening end of the first divided piece 35 </ b> A, a locking portion 35 a that can be locked with the pair of main bars 34 located on the second step from the bottom of both sides is bent. On both sides of the opening end of the second divided piece 35B, a locking portion 35b that can be locked to the pair of main bars 34 located at the lower ends of both sides is bent.

  In the second modified example shown in FIGS. 8A and 8B, in the same manner as in the first modified example, the stirrup 35 constituting the reinforcing bar set 32 is a lower side opening upward. The first divided piece 35A is divided into an upper second divided piece 35B that opens downward. On both sides of the opening end of the first divided piece 35A, a locking portion 35a that can be locked to the pair of main bars 34 located on the second stage from the top of both sides is bent. On both sides of the opening end of the second divided piece 35B, a locking portion 35b that can be locked with the pair of main bars 34 located at the second stage from the bottom of both sides is bent.

  In the third modified example shown in FIGS. 9A and 9B, the stirrup 35 constituting the reinforcing bar set 32 has a lower first divided piece 35A that is linear, and an upper side that opens downward. The second divided piece 35B is divided. Engaging portions 35a that can be engaged with the pair of main bars 34 located at the lower ends of both sides are bent at both ends of the first divided piece 35A. On both sides of the opening end of the second divided piece 35B, a locking portion 35b that can be locked to the pair of main bars 34 located at the lower ends of both sides is bent.

  In the fourth modified example shown in FIGS. 10A and 10B, the stirrup 35 constituting the reinforcing bar set 32 has a first divided piece 35 </ b> A on one side that forms a straight line, and an opening toward one side. And is divided into the second divided piece 35B on the other side. Engaging portions 35a that can be engaged with a pair of main bars 34 located at both upper and lower ends on one side are bent at both end edges of the first divided piece 35A. Engagement portions 35b that can be engaged with the pair of main bars 34 located at the upper and lower ends on one side are bent above and below the opening end of the second divided piece 35B.

(Second Embodiment)
Next, a second embodiment embodying the present invention will be described. In each of the embodiments and modifications after the second embodiment, the description will focus on the parts different from the first embodiment.

  In this 2nd Embodiment, as shown in FIG.11 and FIG.12, the concrete part 31a of the precast concrete 31 is formed in the cross-sectional substantially L shape so that the bottom face and one side surface of the beam 52 may be comprised. . A plurality of protrusions 41 extending in the width direction are formed at predetermined intervals on the upper surface of the bottom wall of the concrete portion 31a. A reinforcing bar 42 is embedded in the ridge 41 and the side wall. A plurality of main reinforcing bars 34 are arranged on the bottom wall protrusions 41 of the precast concrete 31 and a plurality of annular ribs 35 are fixed so as to surround the main reinforcing bars 34, whereby a reinforcing bar assembly is provided. 32 can be assembled.

Therefore, also in the second embodiment, substantially the same effect as that described in the first embodiment can be obtained.
(Third embodiment)
Next, a third embodiment embodying the present invention will be described.

  In the third embodiment, as shown in FIGS. 13 and 14, the concrete portion 31a of the precast concrete 31 is formed in a substantially L-shaped cross section, as in the case of the second embodiment. A reinforcing bar 42 is embedded in the side wall of the concrete portion 31a so as to extend to the upper surface of the bottom wall of the concrete portion 31a. Between the upper surface of the bottom wall of the concrete part 31a and the reinforcing bar 42, a plurality of spacers 43 for holding the reinforcing bar 42 at the upper end part are interposed. A plurality of main reinforcing bars 34 are arranged on the bottom wall of the concrete portion 31a, and a plurality of annular ribs 35 are bound so as to surround the main reinforcing bars 34, whereby the reinforcing bar set 32 is assembled. It is like that.

Therefore, also in the third embodiment, substantially the same effect as that described in the first embodiment can be obtained.
(Fourth embodiment)
Next, a fourth embodiment of a method for constructing a reinforced concrete structure embodying the present invention will be described.

  Now, in this 4th Embodiment, as shown in FIG. 15, the precast concrete 31 which comprises the bottom face of the beam 22 is formed in flat form. In the precast concrete 31, a plurality of lowermost main bars 34 constituting a reinforcing bar set 32 and a plurality of annular ribs 35 surrounding the main bars 34 are embedded in advance. And the remaining main reinforcement 34 which comprises the reinforcing bar set 32 is arrange | positioned in the exterior of the structure of a construction site.

(Fifth embodiment)
Next, a fifth embodiment of a method for constructing a reinforced concrete structure embodying the present invention will be described.

  In the fifth embodiment, as shown in FIG. 16, the precast concrete 31 constituting the bottom surface of the beam 22 is formed in a block shape. In the precast concrete 31, a plurality of main bars 34 excluding the uppermost main bar 34 constituting the reinforcing bar set 32 and a plurality of annular rib bars 35 surrounding the main bar 34 are embedded in advance. The remaining uppermost main bars 34 constituting the reinforcing bar set 32 are arranged outside the structure at the construction site.

(Sixth embodiment)
Next, a sixth embodiment of a method for constructing a reinforced concrete structure embodying the present invention will be described.

  In the sixth embodiment, as shown in FIG. 17, the beam bar 22 does not include the precast concrete 31, and a reinforcing bar set 32 including a plurality of main bars 34 and a plurality of annular ribs 35 surrounding the main bars 34. Consists of only. Then, the reinforcing bar 32 of the beam bar 22 is assembled by binding the ribbed bar 35 to the main bar 34 outside the structure at the construction site.

  DESCRIPTION OF SYMBOLS 21 ... Column reinforcement, 22 ... Beam reinforcement, 25 ... Floor board, 26 ... Formwork, 31 ... Precast concrete, 32 ... Reinforcement set, 51 ... Column, 52 ... Beam

Claims (5)

A method for constructing a reinforced concrete structure, comprising performing N + 1 floor beam reinforcement work and N + 1 floor formwork prior to other works when constructing a reinforced concrete structure. Following N + 1 floor beam reinforcement work and N + 1 floor construction work, N floor work, N floor work, N pillar construction, N + 1 floor work 2. The method for constructing a reinforced concrete structure according to claim 1, wherein at least two of the beam formwork, the N + 1 floor rebar work, and the N + 1 floor rebar work are simultaneously performed. N + 1 floor rebar work and N + 1 floor formwork, N floor wall rebar work, N floor wall formwork, N floor pillar formwork and N + 1 floor beam The method for constructing a reinforced concrete structure according to claim 1, wherein at least one of the following formwork and N + 1 floor reinforcement work is performed. The reinforced concrete structure according to any one of claims 1 to 3, wherein the reinforcing bar set constituting the beam is assembled outside the reinforced concrete structure, and then the reinforcing bar set is installed at a predetermined position. Construction method of things. The said beam has the precast concrete which comprises the bottom face of a beam while extending in the extension direction, and the beam reinforcement provided on the precast concrete, The any one of Claims 1-4 characterized by the above-mentioned. The construction method of the reinforced concrete structure as described in a term.