JPH04131204A - Composite concrete column and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a composite concrete column having an outer surface which is dense and smooth and has a gloss by casting concrete into a concrete pine which is formed by centrifugal forming process and which has a dense outer surface and an inner surface having irregularities due to reinforcing bars or aggregates to form a column of integral construction. CONSTITUTION:In order to form a cylindrical concrete pipe 1 having an outer surface which is dense and smooth and has a gloss by centrifugal forming method, lightweight aggregates having small specific gravity are mixed into ready mixed-concrete to be fed, so that centrifugal force is imparted to the mixed concrete by centrifugal formation, while said concrete is fed, with the result that irregularities 2 are formed on the inner surface of the pipe 1 due to the aggregate. The concrete pipe 1 thus formed is erected at a construction site and ready mixed-concrete 5 is cast into the pipe 1 to bring the concrete 5 into contact with the irregularities of the pipe 1, so that the concrete is solidified integrally with the pipe to form a composite concrete column 6.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to concrete columns, piles, or foundations used in construction, and in particular, concrete columns, piles, or foundations used in construction. The present invention relates to a composite concrete column manufactured using a concrete pipe formed with an exposed surface, and a method for manufacturing the concrete column.

<Prior Art> Concrete columns in conventional buildings were generally constructed by building a formwork at the construction site and pouring ready-mixed concrete into the formwork. Recently, precast concrete construction methods have been developed, and composite concrete columns, which are constructed by pouring ready-mixed concrete on-site into concrete pipes that have been previously formed using centrifugal force forming, have also been implemented. Ta.

<Problems to be Solved by the Invention> However, the former method described above for manufacturing concrete columns at a construction site involves assembling a plurality of formworks on-site, and then pouring fresh concrete into the formworks. The work is complicated and requires skill, and the work efficiency is poor. Furthermore, after pouring concrete, it takes several days to harden and remove it from the mold. there were. Furthermore, since the concrete pillars formed in this manner have rough surfaces, the concrete pillars themselves could not be used as decorative pillars.

Therefore, there is a problem in that after the formwork has been removed, the surface of the concrete column must be refurbished by applying concrete, cement mortar, or the like.

In addition, composite concrete columns made of concrete pipes formed by the latter centrifugal force forming mentioned above have a dense outer circumferential surface and do not require reprocessing of the surface, but the inner circumferential surface of the concrete pipe is formed to be smooth. As a result, the connection with the ready-mixed concrete that was later poured into this concrete pipe was not perfect, and therefore gap separation occurred inside the final formed composite concrete column, which resulted in insufficient overall strength. There were other problems. The composite concrete column and method for manufacturing the same according to the present invention relate to a completely new technology developed in view of these conventional problems.

<Means for Solving the Problems> The composite concrete column according to the present invention is a technology that fundamentally improves the above-mentioned conventional problems, and its gist is that the outer peripheral surface formed using the centrifugal force forming method The composite concrete column according to the present invention is constructed by pouring concrete into a concrete pipe that is dense and has irregularities on its inner circumferential surface due to reinforcing bars or aggregates. It is a technology that fundamentally improves the problems of
The gist of this method is to form a concrete pipe using the centrifugal force forming method using concrete mixed with lightweight aggregate, or to form irregularities on the inner circumferential surface using lightweight aggregate with a low specific gravity, or to form reinforcing bars on the inner circumferential surface. Either the reinforcing bars are laid out so that they are exposed and the concrete pipe is formed by centrifugal force forming, or the concrete pipe is centrifugally formed using ordinary aggregate and washed out with a water jet while rotating to remove irregularities caused by the aggregate inside the concrete pipe. A concrete pipe formed by these methods and having an uneven inner peripheral surface is erected at the construction site, and ready-mixed concrete is poured into the concrete pipe to construct the column.

<Function> As mentioned above, the composite concrete column according to the present invention uses a concrete pipe formed by the centrifugal force forming method on the outside, so the outer peripheral surface is dense, smooth and glossy. There is no need to apply concrete or cement mortar to the surface, and it can be used as a decorative column as is.

Furthermore, since the composite concrete column of the present invention is integrally constructed by pouring concrete inside a concrete pipe and fixing this concrete to the uneven surface of the inner circumference of the concrete pipe, there is no need to worry about the distance between the eyebrows of 11 mm between the two. It is possible to construct strong pillars with no cracks. By incorporating reinforcing bars or steel frames when pouring concrete into a concrete pipe, it is possible to increase the strength of the pipe, especially reinforcing the joints, thereby creating an earthquake-resistant structure.

The concrete pipes constituting the outer wall of the composite concrete column according to the present invention are formed using the centrifugal force forming method, so they can be mass-produced uniformly at a factory at low cost, and the concrete pipes in brackets can be constructed easily. Since it is used as a waste frame on site, work efficiency can be significantly improved.

As described above, the method for manufacturing a composite concrete column according to the present invention is a method in which a concrete pipe manufactured by centrifugal force forming is used, the concrete pipe is erected at the construction site, and fresh concrete is poured into the concrete pipe. Therefore, the conventional work of assembling formwork on site is completely unnecessary, making the work easier and eliminating the need for formwork.

The method of the present invention uses lightweight aggregate, which has not been used in the past because it causes separation, when forming the concrete pipe by centrifugal force. By forming irregularities with ordinary aggregate on the inner peripheral surface by forming irregularities with timber, exposing reinforcing bars on the inner peripheral surface, or washing out with water jet,
This uneven surface, which is made up of concavities and convexities, acts as an anchor, thereby making it possible to firmly connect the fresh concrete poured into the concrete pipe to the concrete pipe.

<Example> An example of a composite concrete column and a method for manufacturing the same according to the present invention will be specifically described with reference to figures. FIG. 1 is a partial cross-sectional perspective view of the composite concrete column according to the present invention, and FIG. A perspective explanatory view showing the inner circumferential surface of the concrete pipe, and FIGS. 3 and 4 are perspective explanatory views of the concrete pipe on the other side, respectively.

An embodiment of a composite concrete column according to the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 1 indicates a cylindrical concrete pipe, which is formed using a centrifugal force forming method.

Therefore, the outer peripheral surface is dense, smooth and glossy. Furthermore, as shown in Fig. 2, the entire inner circumferential surface of the concrete pipe 1 is made of lightweight aggregate, which is not used in the past to cause separation.
is provided. In forming the unevenness 2 made of this light aggregate such as camphor on the inner circumferential surface of the concrete pipe 1, when the concrete pipe 1 is centrifugally formed, it is necessary to add about 1.2 to 1.2 m. 7th place lightweight aggregate is mixed in advance, and by applying centrifugal force by centrifugal force forming while pouring this fresh concrete, the lightweight aggregate is floated on the inner peripheral surface of the concrete pipe 1 by the separation effect of the material, It is possible to form unevenness 2 on the inner circumferential surface of the concrete pipe 1 using lightweight aggregate. In the above embodiment, the unevenness 2 was formed on the inner circumferential surface of the concrete pipe l using lightweight aggregate, but when arranging reinforcing bars 4 on the inner circumferential surface as in the concrete pipe 3 shown in FIG. It is also possible to expose the reinforcing bars 4 on the inner circumferential surface and form the unevenness 2 due to the reinforcing bars 4 on the inner circumferential surface.

Furthermore, when the concrete pipe 1 is formed by centrifugal force using t aggregate, it is also possible to form irregularities due to the aggregate on the inner circumferential surface by washing the inner circumferential surface with a water jet after forming. It is.

To explain the method for manufacturing a composite concrete column according to the present invention, as shown in FIG. A composite concrete column 6 is formed by standing up the concrete pipe 1, pouring fresh concrete 5 into the concrete pipe 1, and solidifying the fresh concrete 5 integrally while fixing it to the unevenness 2 on the inner circumference of the concrete pipe 1. It can be manufactured.

When manufacturing a composite concrete column 6 by joining multiple concrete pipes l, the concrete pipe l
By inserting an anchor steel frame or anchor reinforcing bars 7 into the inner periphery of the concrete pipe 1 when pouring the fresh concrete 5 into the concrete pipe 1, the joint strength and adhesion of the concrete pipe 1 can be strengthened.

In the above embodiment, a method for manufacturing a cylindrical composite concrete column 6 using a cylindrical concrete pipe 1.3 was explained, but as shown in FIG. Then, it is also possible to manufacture a prismatic composite concrete column.

<Effects of the Invention> Since the composite concrete column and the method for manufacturing the same according to the present invention have the above-described structure and operation, it is possible to obtain a composite concrete column with a dense, smooth, and glossy outer peripheral surface. In addition, the unevenness of aggregate or reinforcing bars interposed between the outer concrete pipe and the ready-mixed concrete placed inside can be used as an anchor to firmly connect the two to each other. It is possible to prevent delamination between the two.

Furthermore, in the present invention, composite concrete columns are manufactured using homogeneous concrete pipes manufactured in a factory using the centrifugal force method as scrap frames for pouring fresh concrete at a construction site, making the work extremely easy. In addition, it has features such as being able to easily and inexpensively manufacture highly accurate and uniform composite concrete columns.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional perspective view of a composite concrete column according to the present invention, Fig. 2 is a perspective explanatory view showing the inner peripheral surface of a concrete pipe, and Figs. 3 and 4 are perspective views of the concrete pipe on the other side, respectively. It is an explanatory diagram. 1.3.8 is concrete pipe, 2 is uneven, 4 is reinforcing bar, 5
is fresh concrete, 6 is a composite concrete column, and 7 is an anchor reinforcing bar. No. 31!1 Applicant: Haneda Huyum Tube Co., Ltd.

Claims (2)

[Claims] (1) It is characterized by being integrally constructed by pouring concrete into the inside of a concrete pipe, which is formed using a centrifugal force forming method and has a dense outer circumferential surface and an uneven inner circumferential surface made of reinforcing bars or aggregates. Composite concrete columns. (2) By forming a concrete pipe using concrete mixed with lightweight aggregate using the centrifugal force forming method, unevenness is formed on the inner circumferential surface using lightweight aggregate with low specific gravity, or reinforcing bars are exposed on the inner circumferential surface. Either by arranging reinforcing bars and forming the concrete pipe using the centrifugal force forming method, or by washing the concrete pipe centrifugally formed using ordinary aggregate with a water jet while rotating it, and removing irregularities caused by the aggregate inside the concrete pipe. A composite structure characterized by erecting a concrete pipe formed by these methods and having an uneven inner circumferential surface at a construction site, and pouring fresh concrete into the concrete pipe to form a column. Method of manufacturing concrete columns.