JP2600082Y2 - Hollow precast concrete members - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a hollow precast concrete member serving as a mold forming both outer surfaces of a reinforced concrete wall.

[0002]

2. Description of the Related Art Conventionally, when constructing a reinforced concrete wall, a precast concrete plate is used as a formwork at the time of concrete casting, and after the concrete is cast, both outer surfaces of the reinforced concrete wall are directly formed by the precast concrete plate. I was At this time, the two precast concrete plates were connected to each other by a separator so that the precast concrete plates did not fall outward due to the lateral pressure of the cast concrete.

FIG. 11 shows this state. That is, the through-hole 3 is formed in each of the two precast concrete plates 1 and the separator 5 is made to penetrate. Nuts 7 or other metal fittings are attached to both ends of the separator 5 to support the concrete plate 1 with these nuts. Then, concrete 11 was cast between the two precast concrete plates 1.

[0004]

However, since both ends of the separator 5 are exposed on the outer surface of the precast concrete plate 1, the appearance is poor and post-treatment must be performed. That is, it is necessary to remove the nut 7 or the metal fitting, cut off both ends of the protruding separator 5, and further close the gap between the separator 5 and the through hole 3. Further, there is a problem that rust or the like is easily generated at both ends of the cut separator 5.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a hollow precast concrete member which does not require post-treatment of a separator and does not generate rust.

To achieve the above object, the present invention provides:
Each pair of precast concrete plate body plate surfaces spaced opposed has been apart from each other, that between these plate bodies
The precast concrete plates are integrally formed by embedding side portions of spiral streaks spiraling in a direction along the plate surface and forming a spiral.

[0007]

[Function] A spiral muscle serves as a muscle width stopping muscle and a separator. The spiral streaks are embedded in the thick part of the precast concrete plate, are not exposed on the outer surface, and do not require post-treatment.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In this embodiment, basically, a pair of precast concrete plate members 1 whose plate surfaces are opposed to each other and are spaced apart from each other are disposed between the plate members 1 along the plate surface.
By embedding the side portion of the spiral muscle 15 to draw directed to spiral in toward, these precast concrete plate 1 is formed by integrally joined.

[0009] The hollow precast concrete member of the present invention comprising two precast concrete plates 1 is manufactured in a factory or the like, transported to a site where a reinforced concrete wall is constructed, and used. At the time of this production, a spiral bar 15 is wound around a reinforcing bar 13 which is a fixing member arranged on a thick portion of the precast concrete plate 1. That is, as shown in FIG. 2, the spiral streaks 15 are formed in a spiral shape that repeatedly draws a closed square shape. Reinforcing bars 13 of each of the two precast concrete plates 1 are arranged inside the rectangular spiral bars 15. Therefore, the spiral bar 15 is wound around the reinforcing bar 13. Figure 1 in this example is a perspective view, a spiral muscle 15 on the wall surface of the reinforced concrete wall
Along directed vertically, it will be Haisuji to draw repeated rectangular shape which is closed in a planar cross-section of the reinforced concrete wall.

[0010] Precast concrete plate 1 at a factory or the like
When the concrete for producing the concrete is cast, the side portions of the spiral streaks 15 are embedded in the thick portion of the precast concrete plate 1. In this way, one spiral streak 15 becomes apparently a number of rebars 19 and
While repeatedly reciprocating between the precast concrete plates 1, the reinforcing members are arranged so as to be directed in the direction along the plate surface .

In FIG. 1, the spiral muscle 15 is
Although only the books are arranged, actually, a plurality of spiral streaks 15 are arranged in parallel according to the size of the precast concrete plate 1 or the like.

[0012] The hollow precast concrete member thus formed is carried to the site and installed at a place where a wall is to be constructed, and both outer surfaces are supported by supports (not shown). Thereafter, concrete is poured between the two precast concrete plates 1. After the cast concrete is hardened, the support is removed. At this time, the spiral streaks 15 are not exposed on the outer surface of the precast concrete plate 1. Further, since it is not necessary to use a conventional separator, there is no need to perform any post-treatment on the separator.

As described above, according to the present embodiment, when the hollow precast concrete member is manufactured in a factory or the like, the spiral streaks 15 are arranged so that one spiral streak 1 is formed.
5, a large number of reinforcing bars 19 are apparently arranged between the two precast concrete plates 1, and the spiral streaks 15 are used to arrange the width stop bars and separators to be arranged between the precast concrete plates 1. Can be combined, and the method of building the formwork can be saved.

Further, as compared with the case where a large number of reinforcing bars are actually arranged, the spiral reinforcing bar 15 is apparently a large number of reinforcing bars 1.
9, so that not only does it function as a separator 5 for preventing the precast concrete plate 1 from falling outside, but also a truss against the force acting in the vertical direction along the precast concrete plate 1. And the force acting in the left-right direction is resisted by bending.

[0015] Closed quadrangular spiral streaks 15
Is perpendicular to both precast concrete plates 1 in a flat section (see FIG. 3), but is oblique to both precast concrete plates 1 in a longitudinal section. For this reason, it has a function as a truss bar arranged obliquely in the vertical direction of the wall, and exhibits vertical rigidity. The same can be said for this vertical rigidity in other spiral muscles described later.

In the above embodiment, the spiral muscle 1
5 is a closed square shape, but in another embodiment, it may be a figure eight shape as shown in FIGS. By making the shape of figure 8, one spiral streak 21
As a result, the reinforcing bars 19, on which a large number of bars are arranged, become slanted and function as truss bars. Can be demonstrated.

Further, as shown in FIGS. 7 and 8 showing the third embodiment, the spiral streaks 23 may be formed into a closed triangular shape 23. Also in this case, the spiral muscle 23 functions as a truss muscle and exhibits lateral rigidity.

In the above embodiment, one continuous reinforcing bar forms the spiral reinforcing bars 15, 21, 23. However, as shown in FIG. 9, two reinforcing bars 25, 25 and a precast concrete One spiral line 26 can also be formed with the reinforcing bar 13 in the plate 1.

At this time, as shown in FIG. 10, by providing a triangular protruding reinforcing bar 27 at a substantially central portion of the spiral shape, the integrity of the precast concrete plate 1 and the cast-in-place concrete can be further improved. . In addition, as shown in FIG. 11, the fixed reinforcing bar 13 can be omitted, and the reinforcing bar inside the precast concrete plate 1 can also be used.

In the above embodiment, the spiral streaks 15, 21, 23, and 26 draw a spiral in a flat cross section, and
But were those directed vertically along the surface, in other embodiments spirals in longitudinal section, and Haisuji to direct the left <br/> right along the wall surface Is also good.

[0021]

As described above, according to the hollow precast concrete member of the present invention, the spiral streaks serve also as the width stopping streaks and the separator. And
The spiral streaks are embedded in the thick portion of the precast concrete plate and are not exposed to the outer surface, so that post-processing is not required and no rust is generated on the outer surface.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing the spiral muscle of FIG. 1;

FIG. 3 is a horizontal sectional view of FIG. 1;

FIG. 4 is an enlarged view of a portion A in FIG. 3;

FIG. 5 is a perspective view of a spiral muscle showing a second embodiment.

FIG. 6 is a horizontal sectional view of a hollow precast concrete member in which the spiral streaks of FIG. 5 are arranged.

FIG. 7 is a perspective view of a spiral muscle according to a third embodiment.

8 is a horizontal sectional view of a hollow precast concrete member in which the spiral streaks of FIG. 7 are arranged.

FIG. 9 is a perspective view showing a spiral muscle according to another embodiment.

FIG. 10 is a horizontal sectional view of a hollow precast concrete member using the reinforcing bar of FIG. 9;

FIG. 11 is an enlarged view of another embodiment of FIGS. 3, 6, and 8;

FIG. 12 is a horizontal sectional view showing a conventional example.

[Explanation of symbols]

 1 Precast concrete plate 15, 21, 23, 26 Spiral streaks

──────────────────────────────────────────────────続 き Continued on the front page (72) Mitsuru Haneishi 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Etsutoku Tamura 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo head office Within the Technical Research Institute (72) Kohei Kurita 4-640 Shimoseito, Kiyose-shi, Tokyo Obayashi Technical Research Institute Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) E04B 2/86 E04C 1/14

Claims (1)

(57) [Scope of request for utility model registration] To 1. A pair of precast concrete plate body plate surfaces spaced opposed has been apart from each other, respectively, the side portions of the spiral muscle directed in a direction along the plate surface thereof between these plate body spirals A hollow precast concrete member which is buried and formed by integrally joining these precast concrete plates.