JPH04197604A - Manufacture for panel of pc tank - Google Patents

Abstract

PURPOSE:To improve the working environment and to shorten construction period, while the coating application of waterproof material is minimized by a method in which a specified waterproof sheet is set, as a bottom form, on the surface of a producing holder with a prescribed curvature, and then a side form is provided and concrete is placed therein. CONSTITUTION:In the manufacture of a roof panel 7, the waterproof sheet 6 used also as a bottom form is set on the surface of the producing holder 5 whose surface is made into a prescribed dome-curvature. Next, a side form 8 and a reinforcing bar, etc., are assembled coincidently with the size of the roof panel 7, and when concrete is placed, the surface of the concrete is molded into the shape of prescribed curvature. A side wall panel 10 is also molded by setting the waterproof sheet 6 used also as the bottom form on the surface of the producing holder 5 similarly to the roof panel 7. Then as the waterproof sheet 6, the sheet in which fibers are planted on one surface of a film, is used. When the constructions of a side wall 2 and a roof 3 are finished, and the construction of a PC tank is completed, the waterproof sheet 6 is closely bonded to the inner surface of each panel 7, 10, therefore the coating area to be coated with the waterproof material is only the concrete filling parts 12, 13, 14, of the side wall 2 and the roof 3 of waterproof material.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a prestressed concrete tank (hereinafter referred to as P
This invention relates to a manufacturing method for the side walls and roof panels of a tank (referred to as C tank), and more specifically, it relates to a manufacturing method using a waterproof sheet on the inner surface of the panel in order to provide waterproofing and anti-corrosion effects to the inner surface of the side walls and roof.

[Conventional technology]

Conventionally, the commonly used construction method for PC tanks is to pour concrete for the bottom slab, assemble formwork on the bottom slab, pour concrete on site to build the side walls, and then install the roof. The method used is to erect shoring and formwork for the roof and pour concrete for the roof.

In addition, in order to shorten the construction period and improve quality control, we have recently manufactured the side walls and roof using braced panels, assembled the precast panels on site, and poured filler concrete between each panel to create the side walls and roof. A method of forming a roof is adopted. The method for producing a precast panel is to temporarily construct a production table having a predetermined curvature in advance, lay a film made of a vinyl sheet or the like on the top surface of the production table, assemble side forms, and pour concrete. In this method, a film is laid on top of the completed precast panel, and the production of the precast panel is repeated.

[Problem that the invention seeks to solve]

Normally, waterproofing is common sense in order to maintain watertightness inside a tank, but in recent years, there have been many cases in which waterproofing materials are applied not only to the inner surface of the side walls but also to the inner surface of the roof to prevent corrosion of concrete. Ta.

For this reason, with the above-mentioned conventional technology, the waterproofing material must be applied over a wide range of surfaces, and the work must be done on vertical surfaces within side walls and on the back of the roof under adverse conditions, resulting in a decline in quality and a delay in the construction period. ing.

Particularly when applying the coating to roofs, workers have to work facing upward for long periods of time, creating a poor working environment. Furthermore, in order to carry out the coating work, temporary construction such as large-scale scaffolding was required.
Construction costs will increase.

[Means for solving problems]

In order to solve the above-mentioned problems of the PC tank, the present invention will be described in detail.The side walls and roof panel of a cylindrical PC tank, which is composed of a bottom plate, side walls, and a roof, are fabricated on a production stand having a predetermined curvature in advance. A film is laid on the top of this production table to serve as a bottom form, side forms are set up and concrete is poured, the concrete surface is finished to a specified curvature, and concrete panels are sequentially formed. Oshi A is a method of manufacturing PC tanks by stacking them, and the film is a PC tank tunnel manufacturing method characterized by using a waterproof sheet with fibers or powder flocked on one side of the film surface.

Although known waterproof sheets can be used, waterproof sheets made of a film mainly made of ethylene-vinyl acetate copolymer with fibers flocked on one side are particularly useful when mortar or concrete hardens (this structure Since the sheet is closely attached to the body and integrated, it is suitable as a waterproof material.

[For production]

With this precast panel production method, the waterproof sheet used as the bottom formwork can be used as a waterproofing material that adheres to the side walls and inner surface of the roof, so the place to apply the waterproofing material after constructing the PC tank is Since only the interfilling concrete part is used, the complicated application work is minimized, making it easier to improve the working environment and shorten the construction period.

〔Example〕

An embodiment according to the present invention is shown in FIGS. 1, 2, 3, and 4.
A method of manufacturing a PC tank panel will be explained with reference to FIGS.

The PC tank according to the present invention is composed of a bottom plate 1, side walls 2, and a roof 3. Usually, the shape of the roof 3 is
As shown in the figure, a dome-shaped structure is often used.

In this embodiment, the shape of the roof 1 will be described as a dome structure.

As for the construction method, after the foundation work and piping work are completed,
A leveled concrete 4 is poured, and the concrete of the bottom slab 1 is poured on the leveled concrete 4 by on-site pouring. When the bottom plate 1 is completed, precast panels, which are the side wall 2 and roof 3 members, are manufactured on the bottom plate 1. The method for manufacturing the roof 3 and side walls 2 will be explained in detail with reference to the drawings. As shown in Figures 2 and 3, prior to manufacturing the roof panel 7, the surfaces are manufactured to have a predetermined dome curvature. A stand 5 is fabricated and temporarily constructed of concrete or the like. The number of production units is determined by the inner diameter of the PC tank, etc. When the production table 5 is completed, a waterproof sheet 6 which also serves as a bottom formwork is laid on the surface of the production table 5, and then a side formwork 8 is assembled according to the size of the roof panel 7. When the side formwork 8 is assembled, reinforcing bars and the like are assembled and concrete is poured. Similar to the production table 5, the concrete surface is shaped to have a predetermined curvature. When the concrete has finished hardening, a waterproof sheet 6 which also serves as a bottom formwork is laid on the concrete surface again, side forms 8 are assembled, concrete is poured, and panels 7 are stacked one on top of the other. The manufacturing of the side wall panel 10 is the same as that of the roof panel 7, and as shown in FIGS. 4 and 5,
First, the surface of the production table 9 is manufactured so that the curvature is the same as the inner diameter of the side wall 2. Next, the waterproof sheet 6, which also serves as a bottom formwork, is laid on the surface of the production table 9, and adjusted to the size of the side wall panel 10. Assemble the side formwork 11.

Next, reinforcing bars, a sheath for prestressed steel (not shown), etc. are assembled, and concrete is poured.

Then, like the roof panel 7, manufacturing is performed by stacking them one after another. The roof panel 7 and the side wall panels 10 are manufactured by several parallel operations.

When the fabrication of the precast panels 7.10 for the roof and side walls is completed, the side wall panels 10 are arranged upright at predetermined positions, and filler concrete 14 is placed between each panel 10 to construct the side wall 2.

Next, the dome panels 7 are erected one after another, and each dome panel 7 is
The roof 3 is constructed by pouring filler concrete 12.13 between the spaces and the center.

When the construction of the side walls 2 and roof 3 is completed, tension is applied using the PC steel material, and each panel and the interfill concrete become an integrated structure.

When the construction of the PC tank is completed, scaffolding is installed inside the tank and waterproofing work is carried out, but since the inner surface of each panel 7 and 10 is already covered with waterproof sheet 6, it is difficult to apply the waterproofing material. is concrete 1 between side wall 2 and roof 3
2.13.14 Part height.

The waterproof sheet 6 used is a film mainly made of ethylene-vinyl acetate copolymer, with fibers or powder flocked on one side of the film. It is preferable to use the surface on which the fibers or the like are flocked as the concrete pouring surface because the flocked surface of the sheet and the structure can bite into each other and completely adhere to each other.

〔Effect of the invention〕

According to the present invention, by using a waterproof sheet as the film used as the bottom formwork during panel production, each panel part has already been waterproofed with a waterproof sheet at the time of panel production, and the parts that will be waterproofed after constructing the PC tank are The concrete fills the gap between each panel, minimizing the complicated application work, improving the working environment and shortening the construction period.

Additionally, most of the side walls and roof were waterproofed on a flat surface during panel production, making quality control easier.

Furthermore, since waterproofing work after constructing the PC tank is kept to a minimum, scaffolding for work can be used on a smaller scale, and construction costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a PC tank for boat fishing. FIG. 2 is a side sectional view showing a method of manufacturing a dome roof precast panel according to the present invention. FIG. 3 is a view taken along arrows A and A in FIG. 2. FIG. 4 is a side sectional view showing a method of manufacturing a side wall precast panel. Fifth
The figure is a view taken along arrows B and B in FIG. FIG. 6 is a cross-sectional view showing the installed state of the dome precast panel. FIG. 7 is an inner development view showing the construction status of the side wall precast panel. In addition, 5 in the figure is the production table for the dome. 6 is a tarpaulin sheet. 7 is a dome precast panel. 8 is the side formwork for the dome. 9 is the production table for the side wall. 10 is a side wall precast panel. 11 indicates a side formwork for side walls. Figure 7 Σ Ward c Tsubu ゞ

Claims (1)

[Claims] (1) Side walls and roof panels of a cylindrical prestressed concrete tank consisting of a bottom plate, side walls, and a roof,
A production table with a predetermined curvature is prepared in advance, a film is laid on the top surface of the production table as a bottom form, a side form is provided and concrete is poured, and the concrete surface has a predetermined curvature. A method for producing a panel of a PC tank, characterized in that a waterproof sheet having fibers or powder flocked all over the surface of one side of the film is used as the film in the method of producing concrete panels by stacking them one after another.