JP2846937B2 - Manufacturing method of composite concrete columns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to concrete columns, piles,
Also, the present invention relates to a method of manufacturing a composite concrete column used for a foundation or the like, and more particularly to a method of manufacturing a composite concrete column using a concrete tube formed by centrifugal force forming method and having irregularities formed by an aggregate on an inner peripheral surface. .

<Prior Art> Conventionally, concrete pillars in buildings have been constructed by forming a formwork at a construction site and placing ready-mixed concrete into the formwork. In recent years, a precast concrete method has been developed, and composite concrete columns constructed by placing ready-mixed concrete on site in concrete pipes previously formed by centrifugal force forming have been implemented. Was.

<Problem to be Solved by the Invention> However, the former method of manufacturing a concrete column at the above-mentioned conventional construction site involves assembling a plurality of forms at the site, and then punching the ready-mixed concrete into the forms. Since it must be installed, the work is complicated, skill is required, work efficiency is poor, and it takes several days to solidify the concrete and remove it after casting concrete. was there.

Further, since the concrete pillar thus formed has a rough surface, the concrete pillar itself cannot be used as a decorative pillar as it is. Therefore, there is a problem that the makeup must be redressed by applying concrete, cement mortar, or the like to the surface of the concrete column after removing the formwork.

The composite concrete column made of the concrete tube formed by the latter centrifugal force molding does not require reworking of the outer surface because the outer surface is dense, but the inner surface of the concrete tube is formed smoothly. As a result, the joint with the ready-mixed concrete poured into the concrete pipe later is not perfect, and therefore, gap separation occurs inside the finally formed composite concrete column, which results in insufficient overall strength. And so on.

The method for manufacturing a composite concrete column according to the present invention relates to a completely new technique developed in view of the conventional problems.

<Means for Solving the Problems> The method for manufacturing a composite concrete column according to the present invention is a technique which fundamentally improves the above-mentioned conventional problems, and the gist of the method is to mix concrete mixed with lightweight aggregate. By forming a concrete tube by centrifugal force forming method using a lightweight aggregate with a small specific gravity on the inner peripheral surface, or by rotating a concrete tube formed by centrifugal force molding using ordinary aggregate The inner peripheral surface is washed out with a jet to form irregularities due to the aggregate on the inner peripheral surface, and a concrete pipe having irregularities on the inner peripheral surface formed by these methods is erected at a construction site, and the concrete pipe is formed inside the concrete pipe. The columns are constructed by placing ready-mixed concrete.

<Operation> As described above, the method for manufacturing a composite concrete pipe according to the present invention uses a concrete pipe manufactured by a centrifugal force forming method, and raises this concrete pipe at a construction site to cast ready-mixed concrete into the concrete pipe. Since this is a method of assembling, the work of assembling the formwork on site as in the related art is not required at all, and the work can be facilitated and the formwork can be eliminated.

The method of the present invention uses a lightweight aggregate which has not been conventionally used to cause separation during centrifugal molding of the concrete pipe and uses a lightweight bone having a small specific gravity on the inner peripheral surface by the action of centrifugal force. Since irregularities are formed with the material, or irregularities due to ordinary aggregate are formed on the inner peripheral surface by washing out with water jet, the uneven surface consisting of these irregularities acts as an anchor, and is thereby driven into the concrete pipe. The ready-mixed concrete and the concrete pipe can be firmly connected to each other.

<Example> One embodiment of the method for manufacturing a composite concrete column according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially sectional perspective view illustrating a composite concrete column manufactured by the method according to the present invention. FIG. 2 is a perspective view showing the inner peripheral surface of the concrete pipe.

One embodiment of a method for manufacturing a composite concrete column according to the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 1 denotes a cylindrical concrete pipe formed by a centrifugal force forming method. Therefore, the outer peripheral surface is dense, smooth and glossy. In addition, as shown in FIG. 2 in particular, a lightweight aggregate which has not been conventionally used to cause separation is used on the entire inner peripheral surface of the concrete pipe 1, and irregularities 2 made of the lightweight aggregate are provided. I have. In forming such irregularities 2 made of the lightweight aggregate on the inner peripheral surface of the concrete pipe 1, when the concrete pipe 1 is formed by centrifugal force, a specific gravity of about 1.2 to 1.7 having a small specific gravity is added to the ready-mixed concrete to be charged. By mixing lightweight aggregate and applying centrifugal force by centrifugal force molding while putting this ready-mixed concrete,
The lightweight aggregate can be raised on the inner peripheral surface of the concrete pipe 1 by the separating action of the material, and the unevenness 2 of the lightweight aggregate can be formed on the inner peripheral surface of the concrete pipe 1.

Furthermore, when the concrete pipe 1 is formed by centrifugal force using ordinary aggregate, it is possible to form irregularities due to the aggregate on the inner peripheral surface by washing the inner peripheral surface with a water jet after molding. is there.

As described above, the concrete pipe 1 formed by the centrifugal force forming method in the factory is erected at the construction site, and the ready-mixed concrete 5 is poured into the concrete pipe 1 and the ready-mixed concrete 5 is put into the concrete pipe. The composite concrete pillar 6 can be manufactured by solidifying integrally with the unevenness 2 on the inner periphery of the solid support 1 while solidifying the same.

In a case where a composite concrete column 6 is manufactured by joining a plurality of concrete pipes 1, when the ready-mixed concrete 5 is poured into the concrete pipe 1,
By inserting the anchor steel frame or the anchor reinforcing bar 7 into the inner periphery of the concrete pipe 1, the strength and adhesive strength of the joint of the concrete pipe 1 can be enhanced.

In the above embodiment, the method of manufacturing the cylindrical composite concrete column 6 using the cylindrical concrete pipe 1 has been described. It is also possible to manufacture columnar composite concrete columns.

<Effect of the Invention> Since the method for manufacturing a composite concrete column according to the present invention has the above-described structure and operation, a composite concrete column having a dense outer periphery, and having a smooth and glossy appearance can be obtained. In addition, the irregularities caused by the aggregates interposed between the outer concrete pipe and the ready-cast concrete placed inside the outer pipe act as anchors, so that the two can be firmly joined together, whereby delamination between the two can be achieved. Can be prevented.

Further, according to the present invention, since a composite concrete column is manufactured while using a uniform concrete pipe manufactured by the centrifugal force method in a factory as a waste frame for placing concrete at a construction site, the operation is extremely easy. And a feature that a highly accurate and uniform composite concrete column can be easily and inexpensively manufactured.

[Brief description of the drawings]

FIG. 1 is a partially sectional perspective view illustrating a composite concrete column manufactured by the method according to the present invention, and FIG. 2 is a perspective view showing an inner peripheral surface of a concrete pipe. 1 is a concrete pipe, 2 is uneven, 5 is ready-mixed concrete,
6 is a composite concrete column, and 7 is an anchor reinforcing bar.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mikio Watanabe 1-22-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Haneda Hyume Tube Co., Ltd. (72) Inventor Hiroyoshi Serizawa 1-22-Nishi-Shinjuku, Shinjuku-ku, Tokyo 2 Haneda Hume Tube Co., Ltd. (56) References JP-A-63-130838 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B28B 1/20 B28B 7/00-23 /twenty two

Claims (1)

(57) [Claims] 1. A method of forming a concrete tube by a centrifugal force molding method using a concrete mixed with a lightweight aggregate to form irregularities on the inner peripheral surface with a lightweight aggregate having a small specific gravity, or to form an ordinary aggregate. The inner peripheral surface is washed out with a water jet while rotating a concrete tube formed by centrifugal force to form irregularities due to aggregate on the inner peripheral surface, and the concrete having irregularities on the inner peripheral surface molded by these methods is used. A method for manufacturing a composite concrete column, comprising: erecting a pipe at a construction site; and pouring ready-mixed concrete into the concrete pipe to form a column.