JP4872301B2 - Construction method of RC structure - Google Patents

Description

  The present invention relates to a construction method for an RC structure, and is particularly applied to construction of an RC structure having a high floor such as a warehouse.

  In general, the construction of structures such as columns, beams, and outer walls of RC structures begins with the assembly of work scaffolds, the reinforcement of each structure, the processing and assembly of the formwork, the placement of concrete, and the curing In particular, the construction of the columns and walls is done simultaneously.

In addition, after the concrete is cured, the formwork is dismantled and the construction of the structure is completed.Exterior construction is then performed on each structure, and after a series of construction is completed, the work scaffold is dismantled and removed. The
JP-A-5-79092 JP-A-5-106276

  However, when constructing a building with a particularly high floor, such as a warehouse, many tasks such as assembly of work scaffolds, rebar reinforcement for each structure, and assembly of formwork are performed at high places. Since many temporary materials are used for the frame and work platform, the assembly and disassembly work is very dangerous.

  Also, when placing concrete, it is forced to cast from a high place, so the cover thickness of the reinforcing bars may not be ensured reliably, and concrete separation, cold joints, jumpers, and cracks may occur. As a result, there is a problem that the quality is likely to deteriorate.

  Furthermore, in a building that is built on a limited site such as the center of the city, there are problems such as the surrounding buildings being obstructed and the exterior work becoming very difficult.

  The present invention has been made to solve the above problems, and provides a construction method of an RC structure capable of constructing a high-floor building such as a warehouse efficiently, inexpensively and safely. For the purpose.

Construction method of RC structure of claim 1, wherein, after prior construction pillars, exterior wall between the pillars, in the construction method of the pillars and RC structures of applying the beam and the floor slab directly above the outer wall, the Arrange the column reinforcement of the column, install the column form around the column reinforcement, install the column form frame made of half precast concrete plate on the column form on the outdoor side of the column form frame, and Concrete is placed in the formwork to construct the pillars, then temporary beams are bridged between the pillars, the wall bars of the outer wall are arranged, and the wall molds are placed on the outdoor side and indoor side of the wall bars. Install a frame, install a wall mold made of half-precast concrete plate on the wall mold on the outdoor side of the wall mold , and place the concrete in the wall mold to construct the outer wall. The above-mentioned beam and floor slab formwork are installed on the temporary beam, The slab muscle was Haisuji, and is characterized in that to construct the beam and the floor slab by Da設concrete.

  In particular, the present invention uses a half precast concrete (hereinafter referred to as “PCF”) plate as the outer formwork of the outer pillar and the outer wall on the outdoor side, and at least the outer pillar and the outer formwork of the outer wall and the formwork are installed. This eliminates the external scaffold for the purpose of making the RC structure with high floor height more efficient and labor-saving, and also enables safe construction.

  The PCF plate used here has a plurality of reinforcing bars (so-called “Omni bars”) protruding from the inside of the precast concrete plate at predetermined intervals to form an RC composite that is integrated with the concrete to be placed later. It is a concrete plate to do. Temporary beams are used as support works to receive wall reinforcement, outer formwork of wall formwork, and formwork for building beams and floor slabs on the upper floor, and use shape steel materials such as H-section steel. be able to.

  Temporary beams can be moved to the upper floor as the construction progresses (changed) and can be removed after the construction is completed. In addition, after constructing a pillar, it is also possible to construct a permanent beam before the outer wall between the columns and use the beam as a temporary beam.

The construction method for an RC structure according to claim 2 is the construction method for an RC structure according to claim 1, wherein an inner form that constitutes the indoor side of the wall form is installed on the indoor side of the wall line, and the inner form and then Da設concrete between the outer molds to construct the lower half of the outer wall, then moves the inner die frame upward, out of the concrete between the inner formwork and the outer formwork The upper half of the outer wall is constructed as a joint.

  The present invention prevents the occurrence of concrete separation, cold joints, and jumpers due to work at a high place by placing concrete in multiple times in the construction of the outer wall and casting the concrete over the entire outer wall. The quality of concrete can be improved.

  A construction method for an RC structure according to claim 3 is the construction method for an RC structure according to claim 1 or 2, wherein a finishing material is applied to the PCF plate.

  The present invention is particularly suitable for a case where a building is constructed over the entire site, and the surrounding buildings are obstructed and exterior construction cannot be performed. In this case, for example, tiles, painting, spraying, etc. It is not particularly limited.

  In particular, the present invention can omit at least the outer pillar and the outdoor formwork of the outer wall and the external scaffold for installing the formwork by using the PCF plate as the outer formwork of the outer pillar and the outer wall on the outdoor side. Therefore, it is possible to improve the efficiency and labor saving of the construction of the RC structure with a high floor, and to perform safe construction.

  In addition, since the PCF plate becomes a part of the structure of the outer column and the outer wall, a predetermined cover thickness can be reliably ensured. Furthermore, the PCF plate is preliminarily provided with a finishing material, so that the entire site is constructed, and there is no particular problem even if the surrounding building is obstructed and exterior construction cannot be performed.

  FIGS. 1-12 shows an example of the construction method of the RC structure of this invention, and the construction procedure is demonstrated below.

  First, the column 1 is grounded (see FIG. 1). The column reinforcement 1 assembles a plurality of main reinforcements 1a and hoop reinforcements (or spiral reinforcements) 1b into a rectangular or circular cage shape according to the cross-sectional shape of the pillar to be constructed. Further, at that time, differential bars 1c and 1c that project to the side of the column and serve as joints with the wall bars described later are arranged, laths (not shown) of the concrete joints, and pipes for placing concrete (for example, Incorporate spiral tubes (not shown).

  Next, the built-up column 1 is built in a position where ink is drawn in advance. When building the column reinforcement 1 on the foundation, the lower end of each main reinforcement 1a is combined with the anchor reinforcement projecting on the foundation in advance and superimposed on the column reinforcement on the floor immediately below. When erected, the lower ends of the main bars 1a are combined with the main bars 1a of the column bars 1 that have been built first to be independent.

  Next, a column mold 2 is installed around the column 1 (see FIG. 2). At that time, an outer mold 2a made of a PCF plate is installed on the outdoor side of the pillar 1. Further, the inner mold 2b is installed on the inner side (indoor side) facing the outer mold 2a and on three sides thereof.

  Here, the PCF plate used as the outer mold 2a is a concrete in which a plurality of reinforcing bars (so-called “omni bars”) are projected at predetermined intervals on the inside of the PCF plate, and are placed later. It is a concrete slab that forms an integral composite, and the outer frame 2a has a height substantially equal to the floor height, is wider than the diameter (lateral width) of the column 1 and both sides are pillars. It extends to the side of the columnar bar 1 along the differential bar 1c of the bar 1 and forms a part of the outer form of the outer wall described later.

  Further, a level adjustment bolt (not shown) is attached to the lower end of the outer mold 2a, and a fastener (not shown) for fixing the lower end and the edge is attached to the lower end and both edge ends. .

  When the outer mold 2a formed in this way is built on the foundation, the position to be built is determined in advance and the lower end portion is fixed on the foundation with a fastener after the construction. When the outer mold 2a is built on the outer floor on the floor immediately below, the lower end of the outer mold 2a is joined to the upper end of the outer mold built in first by a fastener.

  In any case, level adjustment is performed with a level adjustment bolt before the lower end is fixed, and it is supported vertically by an oblique support (not shown) from the inside.

  The inner mold 2b is a mold made of plywood or the like used in conventional concrete work, and is fastened and fixed by a support work made of a thick end material such as a single pipe.

  The inner mold 2a is assembled using an aerial work vehicle and is tightened with a support material made of a single pipe or the like.

  Next, concrete is placed in the column form 2 assembled in this way. When placing concrete, by using a concrete placement pipe that is pre-installed in the column reinforcement 1, concrete separation, cold joints, jumpers, etc. due to work at heights are prevented, and concrete filling is performed. To improve performance.

  In addition, if the concrete is placed while assembling the inner mold 2b at least twice and moving it up (replacement), it will be possible to prevent the separation of the concrete due to the work at the height, Can improve the quality.

  Next, when the concrete of the pillar is sufficiently cured, the outer mold 2a is left, and the inner mold 2b is disassembled and removed (see FIG. 3). Thus, the RC structure pillar 3 is constructed.

  Next, the temporary beam 4 is bridged between the columns 3 and 3 of the RC structure thus constructed (see FIG. 5). When the temporary beam 4 is installed, a bracket 5 for receiving the installation beam 4 is protruded from the side of the column 3 (see FIG. 4), and the end of the temporary beam 4 is bolted to the bracket 5 respectively.

  The bracket 5 is attached to a slightly lower side of a main beam (or a floor slab) to be constructed later, and an insert nut (in FIG. Use a mounting bolt (not shown) to be screwed onto the insert nut.

  The temporary beam 4 is made of a section steel material such as H-shaped steel or I-shaped steel, and an aerial work vehicle is used for mounting the bracket 5 and installing the temporary beam 4.

  Next, the wall reinforcement 6 is assembled. The wall bars 6 are constructed by assembling a plurality of vertical bars and horizontal bars into a rectangular lattice shape, and assembling doubly if necessary. Reinforcing bars that are slightly longer than the floor height are used for the vertical bars of the wall bars 6, and the upper end of the vertical bars is the joint part with the wall bars on the upper floor installed on the upper side, and the horizontal width is between columns 3 and 3 (column It is almost the same as the internal width of the span. Moreover, when the width is too large because the span between the columns 3 and 3 is long, it may be divided into a plurality of parts as necessary.

  When assembling the wall reinforcement 6, throw away concrete in the ground yard and mark the positions of the attachments such as fasteners and openings attached to the outer formwork of the outer wall, which will be described later, and the openings. Avoid bar arrangements.

  Next, the wall reinforcement 6 thus built is built in a position marked in advance between the adjacent columns 3 and 3 (see FIG. 6). When the wall reinforcement 6 is built on the foundation, the lower end of each vertical reinforcement is connected to the anchor reinforcement projecting on the foundation in advance, and it is overlaid on the wall reinforcement 6 on the floor immediately below. When erected, the lower end of each vertical bar is combined with the upper end of each vertical bar of the wall bar previously built.

  In either case, both end portions of each horizontal bar of the wall bar 6 are coupled to the insertion bar 1 c protruding from the side of the column 3. When the wall bars 6 are hung, the hung portion is appropriately reinforced with a wire or the like and hung with a dedicated hanging jig.

  Next, the wall formwork 7 is installed on both sides of the wall reinforcement 6 (see FIGS. 7 and 8). When the wall mold 7 is assembled, an outer mold 7a made of a PCF plate is built on the outdoor side. Further, the inner mold 7b is installed on the indoor side of the wall reinforcement 6 facing the outer mold 7a. The outer mold frame 7 a is formed at the same height as the floor height, like the outer mold frame 2 a of the column mold 2. Further, a level adjustment bolt (not shown) is attached to the lower end portion of the outer mold 7a, and a fastener (not shown) for fixing the lower end portion and the edge end portion is attached to the lower end portion and both edge ends. Yes.

  When the outer mold 7a is built on the foundation, the position to be built is determined in advance and the lower end is fixed on the foundation with a fastener. Further, when building on the outer floor form 7a on the immediately lower floor built in advance, the lower end part is joined to the upper end part of the outer form frame 7a built in first by a fastener.

  In either case, the level adjustment bolt is used to adjust the level before fixing the lower end portion, and the edge portions on both sides are fixed with the edge portions of the adjacent outer mold 7a and fasteners, respectively, Further, the upper end is temporarily fixed to the temporary beam 4, and an oblique support (not shown) is installed on the inner side to support it vertically.

  The inner mold 7b is a mold made of plywood or the like used in conventional concrete work, and is fastened and fixed by a supporting work made of a thick end material such as a single pipe.

  Further, the inner mold frame 7b is assembled at least twice, and is used while being moved up (replaced). The assembly and replacement of the inner mold 7b are performed using an aerial work vehicle.

  When the first-stage inner mold 7b is installed, the concrete 11 is placed between the outer mold 7a and the inner mold 7b, and the lower half of the outer wall 8 is constructed by sufficiently curing. When the concrete 11 is sufficiently cured, the inner mold 7b is replaced (moved) upward, and the remaining upper half outer wall is constructed. In this way, the outer wall 8 of the RC structure is constructed integrally with the columns 3 and 3 between the columns 3 and 3 that have been previously constructed.

  When replacing the inner mold 7b, the lower end of the inner mold 7b is overlapped by about several centimeters on the inner side of the frame constructed by the first placement of the concrete 11, thereby eliminating the mistake.

  Next, on the columns 3 and 3 and the outer wall 8 of the RC structure thus constructed, the beam and floor slab 9 on the upper floor constructed on the columns 3 and the outer wall 8 are constructed. At the time of construction, first, the formwork 10 of the beam and the floor slab 9 is installed with the temporary beam 4 as a support (see FIG. 10), and the beam and slab reinforcement are arranged thereon, and the concrete 11 is placed. Set up. Then, when the concrete 11 is sufficiently cured, the mold 10 is disassembled and removed. In this way, the beam and floor slab 9 on the upper floor are constructed. The temporary beam 4 is removed together with the formwork 10 after the beam and the floor slab 9 are constructed.

  Through the above steps, the pillar 3, the outer wall 8, the beam and the floor slab 9 for the first floor of the RC structure are constructed. Therefore, by repeating this process upward, a multi-storey RC building structure can be constructed very efficiently and safely.

  The present invention is particularly effective when building a high-rise building with an RC structure such as a warehouse, but is not necessarily limited to an RC structure with a high floor height, and an RC structure with a low floor height. The present invention can also be applied to.

The construction procedure of this invention is shown, (a) is a plan view of a state in which a column is built, and (b) is a front view thereof. The construction procedure of this invention is shown, (a) is a plan view of a state in which a column formwork is installed around the column reinforcement, (b) is a front view thereof, and (c) is a side view thereof. The construction procedure of this invention is shown, (a) is a top view of the column of the constructed RC structure, (b) is the front view. The construction procedure of this invention is shown, (a) is a plan view showing a state in which a bracket projects from the side of the constructed pillar, and (b) is a front view thereof. The construction procedure of this invention is shown, (a) is a top view which shows the state which spanned the temporary beam between the constructed | assembled pillars, (b) is the front view. The construction procedure of this invention is shown, (a) is a plan view showing a state where temporary beams are bridged between constructed columns and wall bars are arranged, and (b) is a front view thereof. The construction procedure of the present invention is shown, (a) is a plan view showing a state in which a temporary beam is bridged between constructed columns, wall bars are laid out, and an external form made of a PCF plate is installed on the outdoor side. (B) is the front view, (c) is the side view. The construction procedure of this invention is shown, (a) lays a temporary beam between the constructed pillars, arranges the wall bars, and forms the external formwork made of PCF plates on the outdoor side, and the first stage on the indoor side. The top view which shows the state which installed the inner formwork, (b) is the front view, (c) is the side view. The construction procedure of the present invention is shown, (a) is a plan view showing a state in which the first-stage concrete is placed between the outer mold frame and the inner mold frame in FIG. 8, (b) is a front view thereof, (c) is the side view. The construction procedure of this invention is shown, (a) is the top view which shows the state which installed the formwork for constructing a beam and a floor slab on the upper side of the pillar and outer wall of the constructed RC structure, (b) is the front FIG. The construction procedure of this invention is shown, (a) is the top view which shows the pillar and outer wall of RC structure which removed the temporary beam and was constructed integrally, (b) is the front view. FIG. 11 is a cross-sectional view of the ii gland in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Column reinforcement 1a Main reinforcement 1b Hoop reinforcement 1c Insertion 2 Column formwork 2a Outer formwork 2b Inner formwork 3 RC structure pillar 4 Temporary beam 5 Bracket 6 Wall reinforcement 7 Wall formwork 7a Outer formwork 7b Inner formwork 8 RC Structural walls 9 RC structure beams and floor slabs 10 Beam and floor slab forms 11 Concrete

Claims (3)

  In the construction method of the RC structure for constructing the outer wall between the columns, the beam located immediately above the columns and the floor slab, and the floor slab after the columns are preliminarily constructed, the column bars of the columns are arranged, A column formwork is installed around the column, and a column formwork made of a half precast concrete plate is installed on the columnar form on the outdoor side of the column formwork. Next, the temporary beam is bridged between the pillars, the wall bars of the outer wall are laid out, and the wall formwork is installed on the outdoor side and the indoor side of the wall line. A wall formwork made of a half precast concrete plate is installed on the outer wall formwork, concrete is placed in the wall formwork to construct the outer wall, and then the beam and floor slab are placed on the temporary beam. The formwork is installed, the beam and slab bars are placed in the formwork, and the concrete is placed. Construction Method of the RC structure, characterized by constructing the beam and the floor slab by pouring. Install the inner formwork that constitutes the indoor side of the wall formwork on the indoor side of the wall reinforcement, and place concrete between the inner formwork and the outer formwork to construct the lower half of the outer wall, 2. The RC structure according to claim 1, wherein the upper half of the outer wall is constructed by moving the inner mold upward and passing over concrete between the inner mold and the outer mold. 3. Construction method.   The construction method for an RC structure according to claim 1 or 2, wherein a finishing material is applied to the half precast concrete plate.

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