JPH0444550A - Semi-precast rc building - Google Patents

Abstract

PURPOSE:To save required power by a method in which precast concrete parts to be formeworks are used as joint parts between columns or beams and walls. CONSTITUTION:As disposable formwork for columns A and beams B, precast concrete parts 1 and 4 are used, and for earthquake-proof walls C, form blocks 7 constituting inner and outer walls are used. For the joint parts for the columns A, beams B, and the wall C, the parts 1 and 4 and the block 7 are connected to form a concrete-packing space 11, and reinforcing bars are arranged. Concrete 12 is placed to integrate the columns A, the beams B, and the wall C together. Also, for floor D, the concrete 12 is placed onto a precast plate 10 to form a semi-precast structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a semi-precast RC building composed of a precast concrete member that also serves as a formwork and cast-in-place concrete (including reinforced concrete).

[Conventional technology]

Various labor-saving construction methods using precast members or semi-precast members have been developed for the purpose of shortening the construction period and for reasons such as a shortage of specialized formwork carpenters. In addition, the applicant previously applied for patent application No. 2-7 as one of the rigid frame prefabricated construction methods.
No. 6195 proposes a precast concrete beam and its construction method.

On the other hand, mainly for wall structures, there is a construction method that uses hollow concrete blocks that constitute the inner and outer surfaces of the wall body and have open sections in the vertical and horizontal directions, and by passing reinforcing bars through the hollow sections, etc.
Construction methods are known in which they are integrated using cast-in-place concrete (for example, Japanese Patent Laid-Open No. 62-1961,
2-10348, JP-A-62-107135). .

[Problem to be solved by the invention]

In the above-mentioned rigid frame prefabrication method, precast concrete members are used as columns, beams, or a part thereof to save labor. However, in the case of plans that include earthquake-resistant walls, there is a problem in that it is difficult to connect the column-beam frame and the earthquake-resistant walls.

In addition, in the construction method in which a shear wall is constructed from a large number of concrete blocks and concrete placed inside the blocks, the column and beam structure is cast on site and form work is required.

The present invention aims to solve the above-mentioned problems in the prior art.

[Means to solve the problem]

The present invention aims to save labor by using precast members that also serve as formwork for columns, beams, walls, and, if necessary, floors, in semi-precast RC buildings composed of precast concrete members and cast-in-place concrete. At the same time, it will ensure that they are integrated.

For the joints between columns or beams and walls, a concrete-filled space is formed surrounded by precast concrete members that can be used for both column formwork or beam formwork, and formwork blocks that make up the inner and outer surfaces of the wall body. By pouring concrete into the space, columns or beams and walls are integrated. The formwork block referred to here is a block that has a cavity for filling with concrete inside the wall in the thickness direction, and forms the inner and outer surfaces of the wall body, and is filled with concrete by passing reinforcement through the cavity. By doing so, the walls are constructed using blocks as formwork.

Precast concrete members used as abandoned formwork for columns and beams include members with a concave cross-section and non-filled sections, parts in which the main reinforcement, hoop reinforcement, stirrup, etc. of the column or beam are partially embedded, and filled materials. A cross section with a part of the reinforcement at the joint with the wall exposed can be used.
In addition to reducing the weight of a precast member, it can be integrated with cast-in-place concrete as a disposable formwork.

The wall in this invention is mainly assumed to be an earthquake-resistant wall, and the formwork blocks described above can be used for the entire wall, or only near the joints with columns or beams, and the other parts are molded on site. It can also be framed and cast in place with concrete.

In addition, in order to further save labor in formwork work, it is possible to use semi-precast RC construction for the floor slab.
In that case, for example, cast-in-place concrete may be placed on a precast concrete plate that also serves as a formwork.

〔Example〕

Next, the present invention will be explained based on the attached drawings.

FIG. 1 conceptually shows a semi-precast RC building of the present invention. In the example shown in the figure, concrete precast members 1 are used as the disposable formwork for columns A and B, respectively.
, 4 are used, and the formwork blocks 7 forming the inner and outer surfaces of the earthquake-resistant wall C are used. At the joint between column A1 beam B and shear wall C, precast members 1 and 4 and formwork block 7
Continuously form the concrete filling space 11, and at the same time, arrange the reinforcement (a part of the reinforcement can be embedded in the precast member 1.4 in advance), and by pouring the concrete 12, the column A and the beam B are placed. and seismic wall C will be integrated. Also, regarding the floor, precast board 10
By making it a semi-precast structure with concrete 12 poured on top, it becomes a semi-precast RC building that achieves significant labor savings as a whole.

No. 251J(a), Inc. shows an example of application of the present invention to an inner wall portion (reinforcement and cast-in-place concrete are omitted).

FIG. 2(a) is a vertical cross section at the cross-section position, showing the beam precast member 4 with a cross-section shaped like a cross and the formwork block 7 that constitutes the shear wall C (inner wall) on the lower side of the beam B. A concrete filling space 11 is formed.

Figure 2 (Company) is a horizontal cross section of the column position, and the column precast member 1 with a U-shaped cross section and the formwork blocks 7 constituting the shear walls C on both sides of the column A are similarly arranged to face each other. A filling space 11 is formed.

FIGS. 3(a) and 3(b) show an example of application of the present invention to an outer wall portion (reinforcement and cast-in-place concrete are omitted).

FIG. 3(a) is a vertical cross section of the beam position, showing the precast member 4 with a cross-section shaped like an arrow placed on the indoor side and the formwork block 7 that constitutes the earthquake-resistant wall C (outer wall) below the beam B. A concrete filling space 11 is formed.

Third [! 1 (6) is a horizontal cross section of the column position, and the column precast member 1 with a U-shaped cross section is similarly placed at the indoor side position.
and the formwork blocks 7 forming the earthquake-resistant walls C on both sides of the column A form a concrete filling space 11.

FIGS. 4(a) and 4(b) show another example of application of the present invention to an outer wall portion. In this example, a flat block 13 is placed on the outdoor side of the column A to form a concrete filling space 11 surrounded by the column precast member 1 or the precast member 4, the formwork block 7, and the flat block 13. There is.

5 to 9 show specific embodiments in which the present invention is applied to an outer wall portion.

Figures 5(a) to (C) show the case where the outer wall thickness is relatively small, and the earthquake-resistant wall C constituted by the formwork blocks 7 has vertical reinforcements 8 and horizontal reinforcements as in the conventional formwork block construction method. 9
is inserted, and intersects with the reinforcement of column A and beam B (column main reinforcement 2, hoop reinforcement 3, beam main reinforcement 5, stirrup 6, etc.) at the connection position with column A and beam B.

In FIG. 5(a), a part of the reinforcement of the beam B is embedded in advance in a beam precast member 4 having a cross-sectional shape. In addition, in FIG. 5(c), the column precast member 1 is a thin member with a thickness equal to or less than the cover thickness of concrete, and a formwork block 7a which is a part of a normal formwork block is cut out to form a concrete filling space 11. The column main reinforcement 2 and the hoop reinforcement 3 are connected to the transverse reinforcement 9 of the shear wall C.
It is arranged to intersect with. FIG. 5(C) shows the positional relationship between the formwork block 7a, the vertical stripes 8, and the horizontal stripes 9 (the same applies to the formwork block 7). It is designed to fit in.

Figures 6(a) and 6(b) show cases where the outer wall thickness is somewhat larger than those in Figures 5(a) to (C), and in this example, the column precast member 1 is a member with a cover thickness of about the same as that of concrete. The precast column member 1 has a built-in hoop reinforcement 3 as reinforcement for the column A.

FIGS. 7(a) and 7(c) show a case where the main reinforcement 2 and hoop reinforcement 3 as reinforcement for the column A are built into the column precast member 1 when the outer wall thickness is relatively small. Earthquake-resistant wall C
In the figure, the formwork block 7a is used only in the connection part with the column precast member 1, and the other parts are made of cast-in-place concrete.
Formwork blocks 7 may be used for the entire seismic wall C as shown in FIG.

Figures 8(a) and (b) are similar to Figures 5(a) to (C) and 7.
This is a case where the outer wall thickness is partially larger than in the cases shown in FIGS. It is a full cross section with the upper part exposed. Although the weight of the column precast member 1 increases accordingly, it is possible to save labor in reinforcing work, pouring concrete on site, and the like. In the case of this embodiment as well, for the entire earthquake-resistant wall C, the formwork block 7
It is possible to have a structure using

9(a) to 9(C) show cases where the outer wall thickness is even larger, and in the cross section of the earthquake-resistant wall C, vertical reinforcements 8 and horizontal reinforcements 9 as wall reinforcements are arranged in two rows, respectively. In this embodiment as well, the column precast member 1 has a full cross section, and the 8th
There are more reinforcements than in Figures (a) and (b).

Further, the entire seismic wall C may have a structure using formwork blocks 7.

FIG. 10 shows an example of holding down the precast member during construction at the outer column position. In the figure, the two-dot chain line indicated by 15 indicates the column precast member 1 and the formwork block 7.
This figure shows the installation position of the separator between section a, and the filling space 11 between the column precast member 1 and formwork block 7a assembled in this way, and the cast-in-place concrete between the formwork block 7 of section C of the shear wall. is poured. Further, reference numeral 16 in the figure is a decorative rib formed in advance on the outer surface of the formwork block 7.

FIG. 11 shows an embodiment of the dowel at the inner wall position, in which instead of arranging the beam precast members 4 facing each other with an L-shaped cross section as shown in FIG. 2(a), the precast members 4 each have a U-shaped cross section. This is the case when . In this case, holes 17 are required for filling the form blocks 7 constituting the seismic wall C with concrete.

〔Effect of the invention〕

■ The semi-precast RC building of the present invention forms a concrete-filled space with a precast member that also serves as a formwork and forms part of a column or beam, and formwork blocks that form the inner and outer surfaces of the wall body. This method uses cast-in-place concrete, and has the advantages of both the prefabricated method for columns and beams and the formwork block construction method, and also has a simple structure in which they connect, and the cast-in-place concrete improves the integrity of these. Secured.

■ Therefore, formwork work on site is significantly reduced, labor is saved, and construction period is shortened.

■ By using formwork blocks at the locations where the shear wall and columns or beams meet, the column/beam frame and the shear wall can be integrated.

■ Rational design is possible by integrating the semi-precast column/beam frame and shear walls.

■ If the floor section is constructed by placing cast-in-place concrete on precast concrete plates that also serve as formwork, significant labor savings can be achieved for the entire building.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional perspective view showing an outline of a semi-precast RC building of the present invention, and Figures 2 (a) and (6) are vertical cross-sectional views of beam positions showing examples of application of the present invention to inner wall parts, respectively. and a horizontal sectional view of the column part, No. 31!1(a). (b) is a vertical cross-sectional view of the beam position and a horizontal cross-sectional view of the column portion, respectively showing an example of application of the present invention to an external wall portion, and FIG.
a) and (c) are vertical cross-sectional views of beam positions and horizontal cross-sectional views of column parts showing other application examples of the present invention to external wall portions, respectively, and FIGS. 5 to 9 are respectively different embodiments of the present invention. Figure 51!1 (a), Figure 6 (a), Figure 7 (a), Figure 8 (a) and Figure 9 (a) are vertical cross-sectional views of the beam position; 5 et al.), Fig. 6 (b), Fig. 7 et al.), Fig. 8 (6), and Fig. 9 et al.) are horizontal sectional views of the column positions, and Fig. 5 (e) and Fig. 9 (e) are respectively Figure 5(b)
and the 91st! I-I sectional view and It is a cross-sectional perspective view showing an example of application. A...Column, B...Beam, C...Wall, D...Floor, 1
...Column precast member, 2...Column main reinforcement, 3...
Column hoop reinforcement, 4... Precast member, 5... Beam main reinforcement, 6... Stirrup, 7... Formwork block,
8... Wall vertical reinforcement, 9... Wall horizontal reinforcement, 10... Floor precast member, 11... Filling space, 12... Concrete, 13... Flat block, 14... Groove, 15・
Separator 16... Decorative rib, 17... Hole Figure (b) Figure (b) Figure (b) Figure (b) Figure 8 (a) Figure ( a) Figures (a) (b)

Claims (5)

[Claims] (1) In a semi-precast RC building composed of precast concrete members and cast-in-place concrete, a precast material that also serves as a formwork that forms part of the column or beam is placed at the joint between the column or beam and the wall. A concrete filling space is formed that is surrounded by the concrete member and the formwork block that has a hollow part for reinforcing and concrete filling inside in the thickness direction and constitutes the inner and outer surfaces of the wall body, and the concrete filling space is filled with on-site pouring. A semi-precast RC building characterized in that the columns or beams and walls are integrated by pouring concrete. (2) The semi-precast RC building according to claim 1, wherein reinforcing bars as reinforcement for columns or beams are integrated in advance into the precast concrete member. (3) The semi-precast RC building according to claim 1 or 2, wherein the wall uses the formwork block only in the vicinity of the joint with the column or beam, and other parts are formed of cast-in-place concrete. (4) The wall is constructed by using the formwork blocks for substantially the entire wall and pouring cast-in-place concrete into the filling space and the hollow portions that are continuous vertically and horizontally between adjacent formwork blocks. The semi-precast RC building according to claim 1 or 2, wherein the pillar or beam and the wall are integrated. (5) Claim 1, 2, 3 or 4, wherein the floor slab formed between the columns and beams is made by pouring cast-in-place concrete onto a precast concrete plate that also serves as a formwork.
The semi-precast RC building described.