JPH0531632B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a construction method for constructing columns, beams, and floor slabs of reinforced concrete buildings.

(Conventional technology) In recent years, buildings have tended to become taller, more diverse, and larger, and as a result, it has become increasingly important to save labor, shorten construction periods, and reduce construction costs in construction work. There is.

For this reason, in recent years, various efforts have been made to construct columns, beams, and floor slabs, which used to be complicated and troublesome, especially in reinforced concrete buildings, which required high precision and required a lot of temporary construction work. construction method is provided. Examples of these construction methods include methods that use PC members and PC formwork for columns and beams, and methods that use waste formwork such as deck plates, Omnia version (trade name), and void slabs for floor slabs. It is being

(Problems to be Solved by the Invention) However, with the above construction methods, for example, the members are heavy and it is inconvenient to lift and handle them, and reinforcing the formwork and shoring cannot be omitted.
In addition, there are still problems such as the slab becoming thicker, and when the above-mentioned construction methods are used in combination, the assembly and installation of each member is complicated, so it cannot be said that it is still satisfactory.

This invention has been made in view of the above circumstances, and aims to provide a building construction method that can sufficiently save labor in construction, shorten construction period, and reduce construction costs.

(Means for Solving the Problems) This invention provides a column formwork installation process for attaching steel pipes to be used as post formwork around column reinforcing bars, and a process for installing steel pipes between steel pipes when constructing a reinforced concrete building. A beam installation process that spans half PC beams, a truss installation process that spans a truss with a bottom plate between half PC beams, and a floor formwork that spans between the bottom plates of the trusses and between the bottom plate and half PC beams. Columns, beams, and floor slabs are constructed through a formwork installation process and a concrete pouring process in which concrete is poured inside the steel pipe, on top of the half PC beam, and on top of the floor formwork.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 to 6.

FIG. 1 is a diagram showing the procedure for constructing one floor of a building using the construction method of this embodiment. Although Figure 1 only shows the area around one pillar, the entire floor will be undergoing construction at the same time.

First, Figure 1A shows a state in which construction has already been completed using the same method up to the floor immediately below the floor on which construction is to begin. In other words, the floor slab for this floor has already been made, and the main column reinforcements 1... are arranged in a circular manner, extending to the columns (columns) on the lower floor.
A spiral hoop wire 2 is wound around this and protrudes above the floor of this floor.

From this state of A, first connect the column main reinforcements 1 as shown in B. The means for connecting the main column reinforcements 1 may be any means commonly used in the past, such as welding or mechanical joints. The upper parts of the connected column main reinforcements 1... are temporarily fixed using a positioning ruler 3. As shown in FIG.
... and is divided into four annular members 3a,
3b, 3c, and 3d are combined, and the column main reinforcement 1... is passed through the hole 4..., and the annular member 3 is inserted into the hole 4...
By fixing the columns a, 3b, 3c, and 3d, the arrangement intervals of the column main reinforcements 1 are maintained appropriately, and the column main reinforcements 1 are connected to each other to prevent them from falling down.

Next, as shown in FIG. 1C, a spiral hoop reinforcement 2 is wound around the column main reinforcement 1 erected as described above. Here, the area where the hoop reinforcement 2 is wrapped is only the area under the beam of this floor,
The lower parts of the main column reinforcements 1, where the hoop reinforcements 2 have already been wrapped (see Figure 1 A), will be wrapped in an overlapping manner.

Next, as shown in d, a steel pipe 6 to be used as a column formwork is attached around the column reinforcing bars assembled by the column main reinforcements 1 and hoop reinforcements 2 as described above (column formwork installation step). As shown in Fig. 3, the steel pipe 6 has a circular cross section, its length is equal to the dimension under the beam of this floor, and collars 7 and 8 are attached to its lower and upper ends, respectively. . This steel pipe 6 is used as a form frame for the column, and also supports the half PC beam as described later.After the concrete for the column is placed, it is also used to strengthen and increase its tenacity. It is what you do. This steel pipe 6 is gradually lowered from above the assembled column reinforcing bars and attached around them, and is fixed to the floor by tightening the collar 7 at the lower end with a bolt (not shown). Note that the positioning ruler 3 attached to the upper part of the main column reinforcements 1 is removed once when installing the steel pipe 6, and is reinstalled after the fixation is completed.

Next, as shown in FIG. , half PC beams 9 and 10,
The collar 8 of the upper end of the steel pipe 6
(beam installation process), half
The PC beams 9 and 10 are manufactured in advance at a prefabricated factory, etc., and as shown in FIG. ... are assembled, and this is buried in concrete 14, which is approximately the lower half of the beam. Note that the half PC beams 9 and 10 have different arrangement of the beam bottom reinforcements 11 so that the beam bottom reinforcements 11 do not collide with each other when attached to the steel pipe 6. The arrangement of the beam bottom reinforcements 11 is as follows:
Ruler 1 as shown in Figure 4 C and E, respectively.
It can be easily determined by using 5 and 16. In addition, the reinforcing bars assembled as above,
When embedding in concrete 14, spacers 17 are used to support and position it.

Half PC beam 9 prefabricated as above,
10 is supported by the collar 8 of the steel pipe 6 as described above, and then the half pipe is constructed as shown in FIG.
Arrange the beam reinforcements 18 and the hoop reinforcements 19 at the top of the beams on the PC beams 9 and 10 (see Figure 6). Also,
A spiral hoop reinforcement 2 is wrapped around the column main reinforcement 1 by wrapping it around the already wound part to the top of the beam. In addition, at this stage, the main column reinforcement 1...
The positioning ruler 3 which is temporarily fixed may be removed.

Next, as shown in Fig. 1G, half PC beam 9,
A half PC beam 20 configured in the same manner as 10 is connected to a steel pipe 6 at its end in a direction perpendicular to the half PC beams 9 and 10 (direction perpendicular to the plane of the paper in FIG. 1).
It is supported by the collar 8 at the top of the bridge. For this half PC beam 20 as well, beam reinforcements 18 and hoop reinforcements 19 are arranged in the same manner as for the half PC beams 9 and 10 (see FIG. 5). Subsequently, the truss 21... and the floor formwork 22... are installed. As shown in FIGS. 5 and 6, the trusses 21 are members made of reinforcing bars formed into a truss shape for reinforcing the floor slab and supporting the floor formwork 22, and are half PC beams 9 or half PC beams 9.
The end portion is supported by the beam reinforcement 12 of the PC beam 10,
These half PC beams 9 and 10 are installed parallel to each other at predetermined intervals in a direction perpendicular to each other (truss installation process). A bottom plate 2 is attached to the lower end of this truss 21.
3 are attached with bolts 24, and a U-shaped floor form 22 is placed between the respective bottom plates 23, 23 of the adjacent and parallel trusses 21, 21. In addition, one end of the floor formwork 22 is placed around the half PC beams 9, 10, 20.
It is supported and installed on the upper surface of the concrete 14 of Nos. 10 and 20 (floor form installation process). This results in
It is possible to form the formwork for the floor slab (the floor on the upper floor of this floor) without requiring any shoring from the floor surface. (This truss 21 and floor form 22 are equivalent to the product names Mitsuko Truss and Cofurform used in the so-called Mitsuko slab system.) As described above, the truss 21 and floor form 22 are installed. After that, wire mesh 25 is placed on the top of truss 21.
Then, as shown in Fig. 1C, concrete is placed inside the steel pipe 6, on the top of the half PC beams 9, 10, and 20, and on the top of the floor formwork 22 (concrete placement process). After the concrete has hardened, bolts 24 from the truss 21 and floor plate 2
3 and dismantle the floor formwork 22, the construction of columns, beams, and slabs for this floor will be completed.Then, the same procedure will be performed on the upper floor, and by repeating this, the entire building will be completed. It will be constructed.

As explained above, the construction method of this embodiment does not require any shoring to support the floor formwork, nor does it require reinforcement of the column formwork (steel pipes) or beam formwork. Additionally, this construction method can be applied to the exterior walls of buildings as well, so no external scaffolding is required. Furthermore, traditional
Compared to construction methods that use PC members, steel pipes and half PC
Beams, trusses, and floor formwork are all lightweight and easy to lift and handle, and they can be assembled and installed easily, which saves on-site work, shortens construction time, and reduces construction costs. This can fully contribute to the reduction. Furthermore, the pillars of buildings constructed using this construction method are reinforced with steel pipes, which also has the effect of increasing structural strength.

The embodiments of this invention have been described above, but
This invention is not limited to the above embodiments; for example, the pillars do not have to be cylindrical, the cross-sectional shape of the steel pipe does not have to be circular, and the hoop bars do not have to be spiral-shaped. Of course. Further, prestress may be introduced into the pillars.

(Effects of the Invention) As described above in detail, according to the present invention, a steel pipe is used as the cast-off form of a column, a half PC beam is supported by the steel pipe, and a truss is supported by the half PC beam. Since the floor formwork is supported by the truss and concrete is poured, there is no need for shoring or reinforcement of the formwork, and the assembly work can be easily carried out, saving labor in construction. This has the effect of shortening the construction period and reducing construction costs.

[Brief explanation of the drawing]

1 to 6 are diagrams showing embodiments of the present invention. FIG. 1 is a diagram explaining the procedure for constructing one floor of a building using the construction method of this embodiment.
B is the state where the main column reinforcement is connected, C is the state where the spiral hoop reinforcement is wrapped around the main column reinforcement, D is the state where the steel pipe is attached, E is the state where the left and right half PC beams are attached, F is the state where the beam reinforcement and the state where the spiral hoop reinforcement of the column is attached (the state where a part of the steel pipe is cut out).
PC beams and trusses, with floor formwork installed,
FIG. 6 is a diagram showing the state in which concrete has been poured. FIG. 2 is a diagram showing a schematic configuration of a positioning ruler for the main column reinforcement used in this construction method, in which A is a plan view and B is a side sectional view. FIG. 3 is a perspective view showing the schematic structure of the steel pipe used in this construction method. Figure 4 shows the schematic configuration of the half PC beam used in this construction method, in which A is a front view, B is a side sectional view, and C is the bottom reinforcement of the half PC beam shown in B. A front view of a ruler used for positioning,
D is a side sectional view of a half PC beam with a different arrangement of beam bottom reinforcements, and E is a front view of a ruler for positioning the beam bottom reinforcements of the half PC beam shown in D. Figures 5 and 6 are diagrams showing the state in which the truss and floor formwork are installed in this construction method, with Figure 5 being an enlarged sectional view of the main part, and Figure 6 being a line view of It is a sectional view of the main part. 1... Column main reinforcement, 2... Hoop reinforcement, 6... Steel pipe,
8...Brim, 9,10,20...Half PC beam,
21...truss, 22...floor formwork, 23...bottom plate.

Claims (1)

[Scope of Claims] 1. In constructing a reinforced concrete building, (a) a column to which a steel pipe, which is used as a waste form for the column and has a flange at least at the upper end, is attached around the assembled column reinforcing bars; Formwork installation process; (b) Place the end of the half PC beam on the collar of the upper end of the steel pipe, and install the half PC beam between adjacent steel pipes.
(c) A truss installation step in which a truss with a bottom plate attached to the bottom chord material is bridged between the half PC beams at a predetermined interval between the half PC beams; (d) Between the bottom plates of the truss. and (e) pouring concrete inside the steel pipe, the top of the half PC beam, and the top of the floor form, respectively. A building construction method characterized by constructing columns, beams, and floor slabs through a concrete pouring process.