JPH04194157A - Formation of precast building column - Google Patents

Abstract

PURPOSE:To prevent deformation arising from shrinkage on formation by a method wherein a hollow column is formed by using a form to which a plurality of plates for joining are buried beforehand at appropriate intervals on a part to be severed and grooves for exposing said plates are provided, and after removal of the form, the column material is severed into two or more parts with cutting applied on the middle part of the plates for joining. CONSTITUTION:Formation member 3a for exposing grooves 3 are arranged at appropriate intervals in the middle of the inside of a cylindrical form 1 on straight lines in the longitudinal direction on the opposite two points on the inside of the form, and a hollow cylindrical column body 5 is formed. After hardening of concrete and removal of the form, the column body 5 is severed in the longitudinal direction at the center of plates 2, and thereby two column members 5a and 5b are formed. The column members 5a and 5b are carried to a construction site and are placed in butting round the outside of a steel column or a column to be reformed, and exposed butting parts of the connecting plates 2 are joined by welding.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of forming architectural columns for steel frame construction and renovation.

<Prior art> Conventionally, when building columns are made of reinforced concrete, internal reinforcing bars are assembled and a pipe-shaped precast column member is inserted and installed from above as a formwork on the outside of the reinforcing bars, and then concrete is placed inside. Attempts are being made to form it by hitting it. This construction method is possible for new construction because the top is open, but for renovation purposes or steel frame construction, the top is closed, so it is possible to use precast column members that are divided into two parts to connect to existing columns or steel frames. The butt is formed from the outside of the pillar.

<Problems to be Solved by the Invention> However, when column members are produced in half in advance in a factory, due to shrinkage during the solidification process, when they are transported to the site and butted and assembled, there may be slight misalignment between the butted surfaces. This problem occurs in that it is difficult to correct the problem, and it is often extremely difficult to connect the column members.

<Means for Solving the Problems> The present invention is a circular or square precast hollow column, in which a connection plate is embedded in the part to be cut in advance, and the outside of the middle part of the connection plate is exposed. The hollow column is formed and cut into two or more pieces in the length direction at the intermediate portion of the connection plate, and the cut column members are butted against a steel column or an existing column to expose the connection. This problem is attempted to be solved by constructing a circular or square column by welding between the plates.

<Function> A plurality of oblong connecting plates are embedded at appropriate intervals on two or more linear positions to be cut in advance, and an exposed groove is provided on the outside of the intermediate part of the connecting plates. Then, a circular or square hollow pillar material is molded, and after demolding, the pillar material is cut into two or more pieces in the length direction so as to bisect the middle part of the connecting plate. Cutters, lasers, high-pressure water, etc. are used for cutting. The column members cut into two or more pieces are then carried to the site, surrounded and butted against the outside of the steel column or the column to be renovated, and the exposed intermediate cut portions of the connection plate are welded together on the outside. The pillar is constructed by filling this part with the same material as the pillar or joint material.

<Example> Examples will be described below based on the drawings.

As shown in FIG. 2, the member 3a for forming the exposing groove 3 is placed at an appropriate interval between the inner sides of each straight line in the length direction at two relative points in the cylindrical formwork 1. Figure 5a
Select one type of metal connecting plate 2 as shown in -d, temporarily attach it, place it on the rotating wheel 4, rotate the formwork 1, pour in the forming material X such as concrete, and form a hollow circular shape. The columnar body 5 is formed. After the columnar body 5 is solidified and demolded, the columnar body 5 is cut in the length direction between the centers of the plates 2 using a diamond cutter (not shown) to form two columnar members 5a.

5b. As shown in FIG. 3, the pillar members 5a and 5b are formed so that the outside of the intermediate cut portion of the connecting plate 2 is exposed.

These column members 5a and 5b are carried to the site, the butted cut surfaces 5C are butted against the outside of the reinforcing bar or steel frame column, or the column 6 to be renovated, and the exposed butt portions of the connection plate 2 are connected by welding 2a. Then, it is filled with filler material 7 to form pillars 8. Reference numeral 9 designates an embedded material for the exposed groove 3 made of the same material as the pillar member.

The rectangular hollow column 5' shown in FIG. 1 and other polygonal columns are obtained by casting. FIG. 6 shows an example in which the connection plate 2 is molded with an exposed groove 3' that continues over the entire length of the cut portion, and the entire length of the abutting surface after connection is covered with the embedding material 9. It shows. Further, FIG. 7 shows an example of dividing the octagonal hollow column 5'' into four parts.

<Effects of the Invention> As described above, in the present invention, two or more hollow columnar members are once formed into a cylindrical or prismatic shape, and then cut in the length direction. Deformation due to shrinkage over time is prevented, and the abutting end faces of the column member are perfectly aligned and no misalignment occurs at all. In addition, since the connecting plate is embedded in the column member with the outside of the intermediate cut portion exposed, the effect of joining and assembling can be achieved extremely easily by welding the plates.

[Brief explanation of the drawing]

Figures 1a and b are perspective views showing cylindrical and prismatic cylinder-shaped joined and assembled columns, and Figure 2 is a vertical cross-sectional view showing centrifugal force forming of the cylindrical column.
Figure 3 is a partial perspective view before joining, Figure 4 is a side view of the same when joined, Figures 5 a - d are examples of the connection plate, and Figure 6 shows an exposed groove extending over the entire length. Partial perspective view of the example, No. 7
The figure is a plan view showing an example of dividing an octagonal hollow column into four parts, Figure 8 is a vertical cross-sectional view of an example where a column is formed by surrounding reinforcing bars, and Figure 9 is a plan view showing a column formed by surrounding an internal column (existing column). A vertical cross-sectional view of the formed reform example, 1 is the formwork, 2 is the connection plate, 3 is the exposed groove,
3a is a forming member, 4 is a rotating ring, and 5.5'. 5″ is the column body, 5a, 5b are the column members, 6 is the interior (existing)
The column, 7 is a filling material, 8 is a column, and 9 is a filling material. Patent applicant F-cho Nippon Zenith Pipe Co., Ltd. - Agent Patent attorney Iku Nagashima 2j2. To-12 No. 10 [1 Tomi, N (4 notes' 75h 5. Button Mourning C 56? N [I No. 6 1 Ku 10? Fig.

Claims (1)

[Claims] (1) A circular or square precast hollow column,
A plurality of connection plates are embedded in advance at appropriate intervals in the part to be cut, and the connection plates are molded so that the outside of the middle part thereof is exposed, and the hollow column is inserted into the middle of the connection plates. Cut the column into two or more pieces in the length direction, butt the cut column members against a steel column or an existing column, and weld between the exposed connection plates to form a circular or square column. A method for forming a precast architectural column, characterized in that: