JP2782284B2 - Method of forming precast building columns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a method of forming a building column for steel-frame building and renovation.

<Prior Art> Conventionally, in the case of a reinforced concrete structure or the like as a building column, a pipe-shaped precast column member is inserted from above and inserted and installed as a substitute for a formwork on the outside of the reinforcing bar, and concrete inside is formed. Has been attempted. This method is possible because the upper part is open in the case of new construction, but in the case of renovation or steel construction, the upper part is closed. Butts are formed from outside the pillars.

<Problems to be Solved by the Invention> However, in the case where a pillar member is to be factory-produced in advance in a half-split body, if it is brought to the site due to shrinkage during the solidification process and assembled as a butt, it takes only a few seconds between the butt surfaces There is a problem that the displacement is not easy to correct due to the displacement, and it is often difficult to join the column members.

<Means for Solving the Problems> The present invention is a circular or square precast hollow column, which is formed by embedding a connection plate in a portion to be cut in advance and exposing the outside of an intermediate portion of the connection plate. Then, the hollow pillar is cut into two or more pieces in the length direction at an intermediate portion of the connection plate, and the cut pillar members are abutted around a steel frame pillar or an existing pillar, and are exposed. Such a problem is to be solved by forming a circular or square column by welding between plates.

<Operation> A plurality of horizontally long connecting plates are embedded at appropriate intervals on two or more linear positions to be cut in advance, and an exposed groove is provided outside the intermediate portion of the connecting plate. Then, a circular or square hollow pillar material is formed, and after removing the mold, the pillar material is cut into two or more pieces in the length direction in such a manner that the intermediate portion of the connection plate is bisected. For cutting, a cutter, laser, high-pressure water, or the like is used. The column member thus cut into two or more pieces is transported to the site, butted around the outside of the steel column or the column to be reformed, and welded and joined between the exposed intermediate cut portions of the connecting plate. The part is filled with the same material or joint material as the pillar to form the pillar.

An embodiment will be described below with reference to the drawings.

As shown in FIG. 2, members 3a for forming the exposed grooves 3 are arranged at an appropriate interval at an intermediate position on the inside of each straight line in the longitudinal direction at two relative points in the cylindrical form 1 and the inner surface thereof. Fig. 5a
-D is selected from metal connection plates 2 as shown in FIGS. 1 to 4, temporarily attached and placed on a rotating wheel 4, the mold 1 is rotated, and a molding material x such as concrete is put into the hollow circular shape. The column 5 is formed. After solidifying and removing the column 5, the column 5 is cut in the length direction using a diamond cutter (not shown) between the centers of the plates 2 to form two column members 5 a and 5 b. It is. As shown in FIG. 3, the column members 5a and 5b
The outside of the intermediate cut portion of the connection plate 2 is formed to be exposed.

The column members 5a and 5b are carried to the site, and are applied to the outside of the reinforcing bar or the steel column or the column 6 to be reformed.
The connecting portions of the connecting plate 2 that are exposed are connected by welding 2a and buried with a filling material 7 to form pillars 8. 9 is an embedding material for the exposed groove 3 made of the same material as the column member.

The rectangular hollow column 5 'and other polygonal columns shown in FIG. 1b are obtained by casting. FIG. 6 shows an example in which an exposed groove 3 ′ of the connecting plate 2 is formed and formed continuously over the entire length of the cut portion, and the entire length of the butted surface after connection is covered with the embedding material 9. Is shown. FIG. 7 shows an example of the octagonal hollow column 5 "divided into four parts.

<Effects of the Invention> As described above, according to the present invention, two or a plurality of hollow pillar members are once formed into a cylindrical shape or a rectangular tube shape, and then cut in the longitudinal direction. Deformation due to shrinkage or the like at the time is prevented, and the column members have the effect that the abutting end faces are perfectly aligned and no displacement occurs. In addition, since the connection member is embedded in the column member so as to be exposed outside the intermediate cut portion, welding between the plates has an effect that joining and assembly can be performed very easily.

[Brief description of the drawings]

1a and 1b are perspective views showing cylindrical and prismatic joint-assembled columns, FIG. 2 is a longitudinal sectional view showing centrifugal force molding of a cylindrical column, FIG. 3 is a partial perspective view before joining, 4 is a side view at the time of joining, FIGS. 5a to 5d are views showing an embodiment of the connection plate, FIG. 6 is a partial perspective view of an example in which an exposed groove is provided over the entire length, and FIG. FIG. 8 is a plan view showing an example in which an octagonal hollow column is divided into four parts, FIG. 8 is a longitudinal sectional view of an example in which a column is formed around a reinforcing bar, and FIG. 9 is a column formed around an internal column (existing column). Longitudinal sectional view of a reform example, 1 is a mold, 2 is a connecting plate, 3 is an exposed groove, 3a is a forming member, 4 is a rotating wheel, 5, 5 ', 5 "is a column, 5a and 5b are A column member, 6 is an internal (existing) column, 7 is a filling material, 8 is a column, and 9 is an embedding material.

Claims (1)

(57) [Claims] 1. A circular or square precast hollow column, in which a plurality of connection plates are embedded in a portion to be cut in advance at an appropriate interval, and the outside of an intermediate portion of the connection plate is exposed. The hollow column is cut into two or more in the longitudinal direction at the intermediate portion of the connection plate, and the cut column members are abutted around steel columns or existing columns to be exposed. A method for forming a precast architectural column, wherein a circular or square column is formed by welding between the connection plates.