JPH0216136Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a ready-made concrete chimney that is manufactured in advance at a factory etc. and erected at the installation site, and is particularly suitable for assisting the combustion of multiple furnaces. This invention relates to a suitably improved ready-made concrete chimney.

[Conventional technology]

Large reinforced concrete chimneys are generally cast in place, but for medium and small concrete chimneys, it is more economical to mass-produce ready-made chimney materials in a factory, transport them to the site, and assemble and install them.

Conventional ready-made concrete chimneys have a structure in which a pair of U-shaped chimney blocks A are stacked facing each other, as shown in Figure 2, but stacking the chimney blocks A requires special skills and a great deal of labor. Therefore, the tubular concrete chimney material B as shown in Fig. 3 is manufactured using heat-resistant cement.
It is used.

Use of such concrete chimney material B allows for quick and easy construction of chimneys and reduces overall costs, and is therefore rapidly becoming popular.

[The problem that the idea attempts to solve]

However, according to the above-mentioned conventional technology, when two fireplaces (not shown) are installed in one house C as shown in Fig. 4, two concrete chimney materials B must be installed in a row. .

When two concrete chimney members B were arranged in a row in this way, there was a problem in that supporting and reinforcing them required a lot of time and effort (approximately twice as much as in the case of one chimney member).

Furthermore, the conventional ready-made concrete chimney material B as described above does not necessarily have sufficient strength and is prone to cracking, so there is a problem that it is inferior in earthquake resistance and wind and rain resistance.

This idea was made in view of the above-mentioned circumstances.
To provide a ready-made concrete chimney which can be quickly and easily erected to assist combustion in a plurality of furnaces, and which is extremely strong and has excellent earthquake resistance and wind and rain resistance.

[Means to solve the problem]

In order to achieve the above object, the ready-made concrete chimney according to the present invention includes a chimney body formed in the shape of a hexagonal column, a chimney base formed continuously in the shape of a square column at the lower part of the chimney body, and the chimney body and the chimney. It consists of a chimney material that has multiple parallel flue holes formed along the longitudinal direction inside the base, and this chimney material is prestressed by multiple PC steel wires buried inside. The chimney base is integrally formed with prestressed concrete, and a plurality of anchors for erecting and fixing the chimney material are embedded in the lower end of the chimney base.

[Effect]

With the above configuration, by erecting one chimney member, the plurality of flue holes can assist in ventilation and combustion of the plurality of furnaces, respectively.

Furthermore, the chimney material, which is integrally formed from prestressed concrete, has extremely high strength.
Cracks are also less likely to occur. Moreover, the chimney body formed in a hexagonal column shape has extremely high strength, especially against bending and torsion. Therefore, the characteristics of prestressed concrete and the characteristics of the hexagonal column shape combine to make this chimney material extremely strong.

Further, the chimney base formed in the shape of a square prism can be extremely easily joined to a structural part of a building.

Further, by using the plurality of anchors buried in advance in the lower end of the chimney base, the chimney material can be erected and fixed at the installation site more quickly and easily.

〔Example〕

FIG. 1 shows an embodiment of the present invention, and is a perspective view of a prefabricated concrete chimney partially cut and shortened.

Chimney material 1 in the ready-made concrete chimney of this example
is integrally molded from concrete, and includes a chimney body 1a, a chimney base 1b continuous to the lower part of the chimney body 1a, and three chimneys provided inside the chimney body 1a and the chimney base 1b. It has a passage hole 2. The chimney body 1a is formed in the shape of a hexagonal column with a regular hexagonal cross section, and the chimney base 1b is formed in the shape of a square column with a rectangular cross section. The three flue holes 2 each have a circular cross section and are arranged at equal intervals,
The chimney material 1 is formed parallel to the longitudinal direction from the upper end to the lower end.

Further, between the center of the chimney material 1 and each flue hole 2, a reinforcing bar consisting of four piano wires to which tension has been applied in advance, that is, a PC steel wire 3 is buried along the longitudinal direction. Therefore, this chimney material 1 consists of four PCs.
It is integrally formed from prestressed concrete that has been prestressed by steel wires 3.

Moreover, a total of eight anchors 4, two anchors 4 in the vicinity of each side, are buried in advance in the lower end of the chimney base 1b, and the tip of each anchor 4 projects downward.

In addition, the chimney material 1 is made of PC in the formwork (not shown).
After setting the steel wire 3 and installing a core for forming the flue hole 2, concrete is poured, and after the concrete has hardened, both ends of the PC steel wire 3 are cut and the core is removed. Molded by.
Further, each anchor 4 is buried in advance during this molding.

In the ready-made concrete chimney configured as described above, the chimney material 1 is manufactured in advance at a factory, etc., and the chimney material 1 is attached to each anchor 4 on the foundation at the installation site.
It is erected and fixed through the. Usually, the chimney body 1a is a part that projects upward from the roof of a building, and the chimney base 1b is a part that is joined to the structure of the building inside or outside the building. The lower end of each flue hole 2 is connected to the exhaust ports of the three furnaces, respectively.

In addition, when implementing the present invention, the number of flue holes 2 in the longitudinal direction is two or more, but if it is three as in the embodiment, there are two flue holes 2 in the hexagonal columnar chimney body 1a.
can be arranged evenly, so the stress is equalized against external forces from all directions, which is advantageous in terms of strength. Also, if there are three flue holes 2,
Since the PC steel wires 3 can also be arranged evenly within the chimney body 1a, prestress can be evenly applied to the chimney material 1. Note that if the flue hole 2 has a circular cross section, the strength is high and the core can be easily installed and removed during concrete pouring.

Note that when implementing the present invention, the upper end of the flue hole 2 is opened upward, but the opposite side may be opened on the side surface near the lower end of the chimney base 1b, as shown by the imaginary line 2a. .

[Effect of idea]

As detailed above, according to the present invention, multiple flue holes are formed inside one chimney material, so one chimney material helps ventilation and combustion of multiple furnaces. This can greatly reduce the time and effort required to erect a chimney.

Furthermore, there are multiple chimney materials buried inside.
Since it is integrally formed from prestressed concrete prestressed with PC steel wire, this chimney material can be compared with chimney materials made of stacked blocks or bricks, as well as with general reinforced concrete chimney materials. However, it has extremely high strength and does not easily crack. Moreover, since the chimney body is formed into a hexagonal column shape, the chimney body has extremely high strength against bending and twisting. Therefore, the characteristics of prestressed concrete and the characteristics of the hexagonal column shape combine to provide an extremely strong material with excellent earthquake resistance and wind and rain resistance.

In addition, the chimney body formed in the shape of a hexagonal column has an extremely good appearance, and the chimney base at the bottom of the chimney body is formed in the shape of a square column, making it extremely easy to connect the chimney base to the building structure. It is extremely easy to blend in with the interior and exterior of the building.

Furthermore, since a plurality of anchors are buried in advance at the lower end of the chimney base, the advantage of the ready-made concrete chimney, which is that the chimney can be quickly and easily erected at the installation site, can be further exploited.

[Brief explanation of drawings]

FIG. 1 shows one embodiment of the present invention, and is a perspective view of a prefabricated concrete chimney with its substantially central portion broken and shortened. FIG. 2 is a sectional view for explaining a conventional ready-made chimney, FIG. 3 is a perspective view of a conventional example different from the above, and FIG. 4 is a perspective view showing an example of use of the conventional example of FIG. 1... Chimney material, 1a... Chimney body, 1b... Chimney base, 2... Flue hole, 3... PC steel wire, 4...
anchor.

Claims (1)

[Claims for Utility Model Registration] A chimney body formed in the shape of a hexagonal column, a chimney base formed continuously in the shape of a square column at the lower part of the chimney body, and a chimney base formed along the longitudinal direction inside the chimney body and the chimney base. This chimney material has a plurality of parallel flue holes formed through the chimney.
A ready-made concrete chimney, which is integrally formed of prestressed concrete prestressed with steel wire, and has a plurality of anchors buried in the lower end of the chimney base for erecting and fixing the chimney material. .