JPS61125807A - Manufacture of prestressed concrete member with through-hole - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing an 89 member such as a PC column having a through hole along the axial direction.

The present applicant previously proposed a PC column having a through hole. This PC pillar has a through hole 15a extending from the upper end to the lower end at the axial center of the pillar 15, as shown in FIG. 3A.

The construction method for the PC column 15 is to first suspend the PC column, connect the column reinforcing bars 12 to the column reinforcing bars 12a of the lower column', and then assemble the formwork 6 for the joint part on the outside of the reinforcing bars, and then Insert the tremie pipe 7 from above, pour ready-mixed concrete 14 through the pipe as shown in Fig. 3B, and when the joint part 15b is filled with concrete, pull up the pipe while continuing pouring and fill the through hole with concrete. The PC pillars are then filled and erected on the slab 8. As a method of manufacturing the PC column 15, the method shown in FIG. 2 was tried. This method is
First, a wooden formwork 11 as a through-hole formwork is assembled into a cylindrical standing position at a position corresponding to the axis of the column, then column reinforcing bars 12 are arranged on the outside of the formwork, and then the formwork is placed on the outside of the formwork. 13 is assembled, and then concrete 14 is poured into the formworks 1 and 13@.

(Problems to be solved by the invention) □ According to the above-mentioned attempts, there were many problems that needed to be improved in terms of work, such as the difficulty in erecting and dismantling the through-hole formwork.

(Means for Solving the Problems) In the present invention, a tubular membrane formwork 1 made of a flexible member such as rubber or vinyl chloride is used as a formwork for through holes. 1 is suspended in the vertical direction, the outer formwork 3 is assembled in an upright state, and then gas at a predetermined pressure is blown into the membrane formwork to maintain its shape with gas pressure, while
Concrete 4 is poured into the outer formwork, the membrane formwork is wrapped with concrete, and after casting, the gas inside the model frame is removed, and the mold is removed by suction force to form columns, piles, etc. 80 having through-holes 5a.
It forms the member 5. The membrane formwork 1 may be set after the outer formwork 3 is assembled. The position at which the membrane formwork 1 is suspended is the axial center of the member 80 or other predetermined position.

(Example) The following is an example in which the present invention is applied to a PC pillar as an example of the present invention.
This will be explained with reference to FIGS. A to 1C.

First, as shown in Figure 1A, at the position of the axis of the column,
A membrane formwork 1, which is a through-hole formwork made of rubber and has a circular cross-sectional tube shape and whose lower end is closed, is hung down, and then the column main reinforcement 2 and the hoop 21 are arranged on the outside of the membrane formwork 1, and after the reinforcement is arranged, the outer mold is formed. Assemble frame 3 in an upright position. Thereafter, as shown in FIG. 1B, air at a predetermined pressure is blown into the membrane formwork 1, and concrete 4 is placed inside the outer formwork 3 while the formwork is kept in shape by air pressure. wrapped in concrete. After concrete is poured, the air in the membrane formwork 1 is removed and this formwork is removed.
Furthermore, when the outer mold 3 is also removed from the mold, a PCC 50 having a through hole 5a in the axial center can be formed as shown in FIG.

Note that PC pillars with multiple through holes are also manufactured in the same manner as clay figurines.

(Effects of the Invention) In the present invention, the through-hole formwork is manufactured using a flexible membrane formwork, so the through-hole formwork can be easily installed and removed, and the manufacturing work can be speeded up. I can figure it out.

[Brief explanation of drawings]

Figures 1A to 1C are process diagrams of an embodiment of the present invention; Figure 2 is a plan view showing the assembled formwork of a conventional example; Figures 3A and 3B are the applicant's This is a process diagram of the method of constructing a PC column with a through hole that was previously proposed. 1... Membrane formwork 3... Outer formwork 4...
Concrete 5...PC member 5a-...through hole or more Patent applicant Shimizu Corporation] Figure 3B

Claims (1)

[Claims] A tube-shaped membrane form made of flexible material is hung vertically, and then gas at a predetermined pressure is blown into the membrane form to maintain its shape and assemble it into an upright position. A PC member having through holes characterized in that concrete is poured into the outer formwork, the membrane formwork is wrapped with concrete, and then the gas in the membrane formwork is removed and the membrane formwork is demolded by suction force. production method.