JPS583915B2 - Construction method of reinforced concrete silo with built-in airtight membrane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a concrete lagoon constructed using the sliding formwork method [g) by providing an airtight membrane inside the wall body, and constructing a conch lagoon [g wall body] connected to the outer shell of the silo, This article relates to a method for constructing a vacuum and airtight silo made of reinforced concrete lagoon using the sliding formwork method for the purpose of making it into an airtight container.

Traditional reinforced concrete lagoon [g] silos are not suitable for storage of gases and liquids, or for use as pressurization or depressurization tanks, as their airtightness decreases over time due to drying and hardening of the concrete lagoon [g]. There are drawbacks.

In addition, although large-scale steel plates have excellent airtightness, there is a risk of local buckling, and they are disadvantageous in terms of maintenance, insulation performance, etc.

In order to solve these weaknesses, reinforced concrete lagoons [g] with inner walls lined with steel plates (silos are seen; however, when used as a vacuum or decompression tank, reinforced concrete lagoons [g] have been installed on the outer surface of reinforced concrete lagoons [g] to transmit negative pressure to the walls. However, there are disadvantages such as the need for a large number of dowels.

The present invention provides an inexpensive reinforced concrete lagoon [g] by incorporating an airtight membrane into the wall using a specific construction method.
The purpose is to construct a vacuum and airtight silo made of steel.

Although the drawings show an embodiment of a cylindrical silo according to the present invention, the present invention is also applicable to a cylindrical silo with a polygonal cross section, a silo having a three-dimensional curved surface, and the like.

First, an overview of the airtight silo constructed using this construction method will be explained.

In FIGS. 1 and 2, pressure due to the difference in gas density between the inside and outside of the mouth is applied to the airtight membrane 1, but in this case, due to the proof strength of the outer wall 2 or inner wall 3 that is in close contact with the airtight membrane, The airtight membrane is made to resist pressure.

The vertical force, lateral pressure, etc. generated by the built-in contents of the silo are jointly resisted by the outer wall 2 and the inner wall 3 through the airtight membrane 1, and are resisted by the wall pillars 5 below the hopper plate 4 on the foundation 6. Supported.

The airtight membrane 1 is connected at the upper and lower ends of the wall 7 to a roof cover plate 8 and a hopper plate 4 made of steel plates, for example, using a method that can maintain airtightness.
The three members, including the airtight membrane 1, form a series of airtight containers.

Next, a first example will be explained.

In this example, a double-structure partition formwork with a void inside is installed at the midpoint of the thickness of a concrete wall constructed using the sliding formwork method, and as the outer formwork slides upward, While simultaneously sliding the partition formwork upward, a liquid substance is discharged into the concrete wall from the lower end of the partition form, and the liquid substance forms an airtight film or airtight layer within the concrete wall. This is a formwork method for constructing airtight silos.

In FIGS. 3 and 4, the partition formwork 9 is connected to the support mechanism 10.
It is suspended from the yoke horizontal member 11, and when the jack 12 is operated, it slides upward at the same time as the outer formwork 13.

The partition formwork 9 has a void inside, is connected to the supply pipe 14, the pressurizing device 15A, and the storage tank 16, and has a discharge port 17 at the lower end.

Since sliding work is started on the assumption that the concrete at the lower end of the outer formwork 13 has hardened, if the lower end of the inner partition formwork 9 is approximately at the same height as the outer formwork 13, the inner partition formwork 9 will rise. A gap of a certain width is formed at the mark.

In this case, the partition formwork is provided with a slight taper that tapers downward to facilitate sliding upward movement.

A liquid substance is discharged from the lower end of the partition frame 9 to fill the gap.

The liquid substance is forced into the partition form 9 from the storage container 16 through the supply pipe 14 by the pressurizing device 15, and is discharged from the discharge port 17.

The above operations are repeated in conjunction with the upward sliding movement of the sliding formwork, so even if the liquid substance gels or hardens after being discharged from the partition formwork 9 and exhibits airtight performance,
A series of continuous airtight films 1 can be formed by adjusting the gelation or hardening time.

The liquid substance stays in the concrete wall as a liquid, or gels or solidifies, forming an airtight film or a watertight film that blocks gas or liquid from permeating into the concrete wall.

If a liquid material such as epoxy resin is used that has adhesive strength with the adjacent concrete surface after hardening and exhibits strength equal to or higher than that of concrete, the concrete wall will have an integral structure with a built-in airtight layer. It can be treated as

Also, the height of the inner partition formwork 9 is made shorter than the outer formwork, and a liquid substance that hardens by reacting or mixing with components in the concrete is discharged into the unhardened part of the concrete to react or mix and harden. Accordingly, it is also possible to form an airtight layer or film with high airtightness.

Next, a second embodiment will be described.

In this example, during the construction of a concrete wall using the sliding formwork method, a thin plate such as a steel plate that does not allow gas to permeate or is difficult to permeate is installed in the middle of the wall, and concrete is poured on both sides of the thin plate at the same time. This is a construction method for vacuum and airtight silos using the sliding formwork method in which thin plates are buried to form an airtight membrane.

In this embodiment, as shown in FIGS. 5 and 6, the thin plate 23 is
It is guided by a guide 25 fixed to the horizontal yoke member 11 and is erected at a predetermined position within the thickness of the wall 7 along with a column 26 that stands vertically. Formwork 1
3 is slid upward by the jack 12 via the yoke 29, concrete is placed between the outer formwork 13 on both sides of the thin plate 23, and the thin plate is embedded in the concrete.

By repeating these steps, the concrete wall is constructed to a predetermined height, forming the airtight membrane 1 in the wall shown in FIG.

FIG. 7 shows details of an embodiment of the longitudinal joint between the thin plates, in which the thin plate 23 is crimped and fixed to the column 26 via the sealing adhesive 27 by screwing the presser fitting 30, and at the same time, The airtightness of the joint is ensured.

FIG. 8 shows details of an embodiment of the horizontal joint between the thin plates, in which a presser spring 31 and a sealing adhesive 2T are connected in advance to the upper side of the lower thin plate 23 that is already buried in the concrete. By inserting the lower end of the upper thin plate 23 between them, they are crimped and joined, and the airtightness of the joint is ensured.

As mentioned above, the airtight membrane in the present invention includes anything from thin membranes and plates to layered membranes with a thickness of 1 cm or more,
Airtightness includes performance ranging from completely blocking gas permeation to making it difficult for gas to permeate.

Furthermore, liquid substances include everything from complete liquids to muddy, grease-like, and cream-like substances.

Furthermore, by using a material having radiation blocking performance for the airtight membrane (or airtight plate) of the present invention, it can also be used to construct a shielding container for radioactive substances using the sliding form construction method.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a cylindrical silo according to the present invention, and FIG. 2 is a cross-sectional view of a wall portion of the cylindrical silo. Figures 3 and 4 explain the mechanism of the sliding formwork method, which is equipped with a partition formwork that can discharge liquid material. Figure 3 shows a cross-section of the mechanism including two yokes. face, 4th
The figure shows a longitudinal section of the mechanism near the yoke. Figures 5 and 6 explain the mechanism of the sliding formwork method in which thin plates are erected at the same time. A longitudinal section of the mechanism is shown. FIG. 7 shows details of an embodiment of a longitudinal joint of sheets, and FIG. 8 shows details of an embodiment of a horizontal joint of sheets. 1...Airtight membrane, 2...Outer wall, 3...
Inner layer wall, 4...hopper board, 5...
Wall pillar, 6...foundation, 7...wall, 8.
... Roof cover board, 9 ... Partition formwork in the curve, 10 ...
...Support mechanism, 11... Yoke horizontal member A12
...Jack A13 ...Outer formwork, 14
... Supply pipe, 15 ... Pressure device A16 ...
...Storage tank, 1γ...Discharge port A23...
... Thin plate, 25, curved guide A26... Support column A27... Seal adhesive A28... Curved Chichisuji,
29... Yoke A30... Presser metal fitting,
31... just press it.

Claims (1)

[Claims] 1. When constructing a concrete lagoon [g wall] using the sliding formwork method, a partition formwork that slides also at an intermediate position of the concrete wall is integrally provided, and the sliding rise of the partition formwork is performed. Conk lagoon [g
How to build an artificial silo. 2. A thin plate, such as an iron plate or a molded resin plate, which is impermeable or difficult to permeate through gas, is erected along a vertically erected support, and the thin plate is joined in a manner that ensures airtightness. Reinforced concrete lagoon [g] with a built-in airtight membrane is characterized by simultaneously pouring concrete lagoon [g] on both sides of the wall and constructing an integrated structural wall using sliding formwork.
How to build an artificial silo.