JPH04155059A - Method and device for producing hollow pca member - Google Patents

Abstract

PURPOSE:To use a formwork repeatedly by disposing an outer circumferential formwork on the outer side of an inner formwork where a plural air tubes are disposed, and injecting compression air into the air tubes between the inner and outer formworks. CONSTITUTION:An inner circumferential formwork composed of a holding frame and air tubes 2 is put on a bottom plate 3 to stand, and pole reinforcements 4 consisting of pole main reinforcements 4a and hoops 4b are disposed around the inner circumferential formwork. Compression air is then supplied into the air tubes 2 to swell them, and concrete is placed between the air tubes 2 and the outer circumferential formwork. After hardening concrete then, air in the air tubes 2 is removed, and the inner circumferential formwork and the outer circumferential formwork are decomposed for forming a hollow PC pole member. A large-sized hollowness can thus be formed in a desired form.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a method and apparatus for manufacturing hollow PCa members such as hollow PCa column members and hollow PCa beam members.

L Conventional technology 1 Conventionally, as a method for manufacturing this type of hollow PCa member, in addition to metal tubes, waste molds such as metal lath, styrofoam, gunball, etc. have been used as the formwork for the hollow part of the PCa member. Ta.

In addition, particularly in the production of hollow column PCa members, there has been a centrifugal force molding method.

[Problem to be Solved by the Invention 1] However, in the method using metal tubes, it is difficult to remove the formwork when assembling the formwork, and in the method using 7 Tarlas, the 70 is washed out during concrete pouring. Furthermore,
Methods using styrofoam, gun balls, etc., and centrifugal force molding methods had problems such as increased costs.

The present invention was made to solve the above-mentioned conventional problem α, and its purpose is to be able to easily form a formwork, to be able to use it repeatedly, to reduce costs, and to be able to form any shape. The present invention provides a method and apparatus for manufacturing a hollow PCa member that can form a large hollow.

Means for Solving EtlM] The method for manufacturing a hollow Pct member of the present invention includes air tubes arranged at predetermined intervals on the outside of an inner peripheral form, which is formed by arranging a plurality of air tubes around a holding frame or a part thereof. Assemble the outer formwork, place reinforcing bars between the inner and outer formwork, inflate the air tube with compressed air, pour concrete, and after the concrete hardens, let the air tube deflate. After that, the inner peripheral formwork is pulled out and the outer peripheral formwork is demolded.

Further, the apparatus for manufacturing a hollow Pct member of the present invention includes an inner peripheral formwork including a plurality of air tubes arranged around or a part of the holding formwork, and a means for supplying compressed air into the air tubes. and an outer peripheral formwork assembled at a predetermined interval on the outside of the inner peripheral formwork.

The hollow PCa member in the present invention includes not only a hollow PCa member whose periphery is completely closed, but also a PCa member in which a part of the periphery is missing and a part of the cavity is opened to the outside.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1 of the PCa, l is a holding frame for the inner peripheral form, and is a holding frame of the 0-piece embodiment made of a synthetic resin such as vinyl chloride or a metal pipe having a predetermined diameter and length. 1 is a circular pipe, but the pipe is not limited to this, and may be a square pipe, a polygonal pipe, or an elliptical pipe if necessary.The holding frame 1 is made of a particularly lightweight material. If it is made of, it may not be pipe-shaped but may be solid.

Reference numeral 2 denotes an F-tube as an inner peripheral formwork, which is arranged around the holding frame 1. The air tube 2 is a long bag made of rubber or synthetic resin, which is carved by injecting compressed air into the bag, and functions as a formwork by resisting the pressure of poured concrete. . The air tubes 2 are in an inflated state and are in close contact with each other.
It is arranged so that 0 does not flow out.

An F supply pipe 2a for compressed air injection is attached to the upper end of each F tube 2, and compressed air is supplied from an appropriate compressed air supply device (not shown) such as an air compressor. The air supply pipes 2a communicate with each other so that the internal pressures of all the air tubes 2 are uniform.

The inner peripheral formwork constituted of the holding frame 1 and the air tube 2 as described above is erected on the is3 as shown in FIG. 3a is a formwork stopper.

When the erection of the inner peripheral formwork is completed, next, as shown in FIG. 3, column reinforcing bars consisting of column main reinforcements 4a and 7-branches 4b are arranged around it. These column main reinforcements 4a and 7-
The bars 4 may be assembled in advance and set as column reinforcing bars.

When the erection of the column reinforcing bars 4 is completed, the outer peripheral formwork 5 is installed on the outside.
Assemble.

Incidentally, after the inner peripheral formwork is erected, the outer peripheral formwork 5 may be set and the branch rope reinforcing bars 4 may be inserted into the space. 4 may be assembled and set by inserting the inner peripheral formwork inside the column reinforcing bar 4.In short, the inner peripheral formwork is placed with the reinforcing bar in the middle part, and the outer peripheral formwork is placed on the outside.・As long as they are assembled, they can be assembled in any order.

When the above-mentioned setting of the inner and outer formwork and reinforcing bars is completed, compressed air is supplied into the air tube 2 to inflate the F-tube 2, and then the air tube 2 and the outer peripheral formwork 5 are inflated.
Concrete C is placed in the gap between the two.

Once the concrete has hardened, remove the compressed air from the air tube 2 and close the air tube 2! After this, the inner peripheral formwork consisting of the holding frame 1 and the air tube 2 is pulled out, and the outer peripheral formwork 5 is dismantled to obtain a hollow Pct column member as shown in FIG.

helmet! As shown in Figures 8 and 9, the above-mentioned air tubes 2 are arranged on the lower side of both sides of the holding frame 6 consisting of a square vibrator. Beam reinforcing bars 7 consisting of beam main reinforcements 7a and stirrups 7b are arranged, and outer formwork 8 is assembled on the outside thereof.

Next, compressed air is injected into the air tube 2 to inflate it, and then concrete C is poured.

After the concrete (C) has hardened, the air is removed from the air tube 2, and the inner and outer molds are removed to obtain a hollow PCa beam member as shown in FIG.

[Effect of the invention J: The inner peripheral formwork is constructed by arranging a plurality of air tubes around the holding frame or a part thereof, and the formwork is easily formed by injecting compressed air into the air tubes. It can be used repeatedly, reducing costs, and it is possible to form large hollows in arbitrary shapes.

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing the set state of the inner peripheral formwork for manufacturing hollow PCa column members, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is the column reinforcing bar. Figure 4 is a sectional view taken along the ■-rV line in Figure 3, Figure 5 is a side sectional view showing the state of concrete pouring, Figure 6 is A sectional view taken along the line Vl-Vl in FIG.
Figure 7 is a cross-sectional view of the hollow PCa column member, and Figure 8 is the hollow P
A plan sectional view explaining the manufacturing method of the Ca beam member, FIG. 9 is a sectional view taken along the rX-ff line in FIG. 8, and FIG. 10 is a hollow P
It is a cross-sectional view of a Ca beam member. 1... Holding frame, 2... Air tube, 2a...
Air supply pipe, 3.-Bottom plate, 3a... Formwork stopper, 4.
...Column reinforcement, 4a...Column main reinforcement, 4b...7-b, 5
... Perimeter formwork, 6 ... Holding frame, 7 ... Beam reinforcing bar, 7
a... Beam main reinforcement, 7b... Stirrup, 8... Outer formwork, C... Concrete.

Claims (1)

[Claims] 1. An outer peripheral form is assembled at a predetermined interval on the outside of an inner peripheral form consisting of a plurality of air tubes arranged around a holding frame or a part thereof, and these inner and outer molds are assembled. After placing reinforcing bars between the frames and inflating the air tube with compressed air, concrete is placed, and after the concrete hardens, the air tube is deflated, the inner formwork is pulled out, and the outer form is A method for manufacturing a hollow PCa member, which comprises demolding a formwork. 2. An inner peripheral formwork comprising a plurality of air tubes arranged around or in a part of the holding formwork, a means for supplying compressed air into the air tubes, and a predetermined means provided outside the inner peripheral formwork. A manufacturing apparatus for a hollow PCa member, characterized in that it is composed of outer peripheral forms that are assembled at intervals.