JPS61176777A - Film type chimney - 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 membrane chimney using a membrane material such as a thin iron plate as the lining of a chimney made of reinforced concrete or the like.

[Conventional technology]

FIG. 4 is a longitudinal sectional view showing an example of a conventional reinforced concrete chimney. 1 is a chimney body of a reinforced concrete chimney, and 2 is a base forming the bottom of the chimney body 1. Bricks 3 are laminated inside the chimney body 1 and used as a lining material to protect the chimney body 1 of the reinforced concrete chimney from corrosive gas and high temperature gas. The bricks 5 are stacked in a circular shape due to the structural constraint of preventing protrusion. Therefore, in order to construct the chimney body 1 most economically, the chimney body 1 is also formed in a circular shape.

Note that 4 is an air layer provided between the chimney body 1 and the bricks 3.

FIGS. 5 and 6 are enlarged vertical cross-sectional views of portions a and b shown in FIG. 4, respectively. 1 shown in Figure 5
05 is the top of the chimney body that protrudes inward and is integrally formed with the chimney body 1; 3a is the brick top located at the top of the stacked bricks 3; 05 is the part filled between the brick top 3a and the top of the chimney body 1a. , is rock wool that absorbs the expansion and contraction of the brick 3, and 6 is the joint part. 7 shown in Figure 6 is
A plurality of bricks 3 stacked upward and downward, respectively
is divided into upper and lower parts and wrapped.9 slide parts, 1b
is a support part provided toward the inner side of the central part of the chimney body 1 to support the bricks 6 stacked upward. In this example, since the height of the chimney is approximately 30 m to 22 m, the support portion 1b is located at an intermediate height of approximately 15 m to 1) m.

[Problem that the invention seeks to solve]

The conventional reinforced concrete chimney constructed as described above has the following problems.

(1) Since the bricks 3 and the joints 6 come into direct contact with high-temperature exhaust gas, they are subject to deterioration, expansion and contraction, and cracks due to the exhaust gas as described below.

■ The pressure inside the chimney is measured at the top of the chimney A shown in Figure 7.
The pressure in the vicinity is always higher than atmospheric pressure, but as shown in Figure 8, there are some chimneys where the internal pressure is higher than atmospheric pressure due to the total height of the chimney. For this reason, exhaust gas (corrosive gas HC2t
SO ri penetrates through the cracks in the bricks 3 and joints 6,
Brick 3 cools near the air layer and turns into a corrosive liquid.
, the joint portion 6 and the chimney body 1 made of reinforced concrete are significantly deteriorated.

■ Rock wool 5 or the like is filled between the brick top 3a and the chimney main body top 1a to absorb expansion and contraction of the bricks 6, but the part filled with rock wool 5 has poor airtightness. Furthermore, due to problems with the compressive strength of the bricks 3, a sliding portion 7 is provided as shown in FIG. 6, but it is extremely difficult to ensure airtightness in this lapped portion.

(2) As mentioned above, reinforced concrete chimneys are at risk of rapid deterioration, so detailed maintenance work such as inspections and replacing the bricks 6 at regular intervals is required. However, there is a need to rebuild chimneys, which requires a large amount of maintenance costs.

(3) In recent years, there has been a sudden increase in the number of users who place importance on the appearance of chimneys, so they are adding concrete to the circular cross section of conventional bricks to obtain various external shapes. However, in this method, the polysynthesis of the concrete of the chimney body 1 and the concrete of the foundation 2 increases, and the number of piles also increases, so an increase in cost is unavoidable.

The present invention has been made to solve the above-mentioned problems, and aims to provide a belly-type chimney that improves the durability, workability, and maintainability of a reinforced concrete chimney body, and reduces costs by 1. shall be.

[Rounding method to solve problems]

The present invention has been made in the ninth attempt to achieve the above object, and uses a membrane material having airtightness and heat resistance as a lining material for a reinforced concrete chimney, and expands and contracts the membrane material into an expansion space and an air layer. This provides a belly-type chimney that absorbs a lot of air.

[Effect]

The membrane material expands and contracts due to temperature changes in the exhaust gas, but
This expansion and contraction is absorbed by the air layer and the expansion and contraction space of the membrane material while maintaining airtightness.

〔Example〕

FIGS. 1(a) and 1(b) are a cross-sectional view and a vertical cross-sectional view showing an embodiment of the present invention. Reference numeral 20 denotes a chimney body made of reinforced concrete constituting a belly-type chimney, 21 a top portion of the chimney body that is provided at the top of the chimney body 2b and projects inward of the belly-type chimney, and 40 a base provided at the bottom of the chimney body 20. It is. Reference numeral 25 is a chimney membrane material attached to the brick 3 shown in FIG. 4, and in this embodiment, it is made of a thin steel plate (for example, an iron plate). This chimney membrane material 23 is provided along the inside of the belly-type chimney, and has airtightness and heat resistance that can withstand about 300°C.
Constructed from known materials. 24 is the chimney main body top 21
A top membrane fixing member made of steel, for example, is provided along the upper surface of the chimney membrane member 24, and the upper part of the chimney membrane member 22 is fixed to this top membrane fixing member 24. In addition, 25 is the chimney body 2
0 and the chimney membrane material 220. 26
Nine reinforcing rings 28 are provided at regular intervals on the outside of the chimney membrane 22, and 28 holds and fixes the chimney membrane 23 in the belly-type chimney, and absorbs vertical and lateral expansion, contraction, and expansion of the chimney membrane 23. It is a retaining spring. Reference numeral 29 denotes a hole through which the holding spring 28 passes through the chimney body 20, and the hole 29 also serves as a ventilation hole for the air layer 25. 30 is chimney membrane material 23
This is an expansion/contraction space for the chimney membrane material that absorbs the vertical expansion and contraction of the chimney. Note that ■ indicates the inflow and outflow directions of the exhaust gas flowing in from the exhaust gas inlet 31.

A detailed explanation of the present invention configured as described above is as follows.O Now, when the temperature of the exhaust gas flowing into the membrane chimney from the exhaust gas inlet 31 increases, the temperature of the chimney membrane material 25 increases. As it expands and stretches, it expands laterally and at the same time expands downward. The downward extension in this case is greater than the lateral expansion. By the way, the horizontal expansion is absorbed by the air layer 25, so the chimney body 2
It does not come into contact with the inner part of the 0, so expansion is not inhibited. On the other hand, the downward extension is absorbed by the membrane material expansion/contraction space 30, so that it does not come into contact with the base 22, and the expansion is not inhibited. When the exhaust gas temperature decreases, the chimney membrane material 22 contracts and shrinks laterally and upwards, contrary to the previous case ◇ In addition, in Fig. 1, the cross section of the membrane type chimney is circular. However, in the present invention, any shape may be used, and for example, as shown in FIG. 2, the chimney body 20
a may have a rectangular shape.

In this case, the supplement shown in FIG. 1 corresponds to the above shape.

It is necessary to form the strong ring 26 into a square shape.

Further, although this embodiment shows a case in which the reinforcing ring 26a is stopped by the retaining spring 28, the present invention is not limited to this, and other means may be used.

FIGS. 6(a) and 6(b) are a cross-sectional view and a vertical cross-sectional view showing another embodiment of the present invention. Reference numeral 200 denotes a steel chimney body constituting a membrane type chimney, and parts having the same functions as those in FIGS. 1 and 2 are given the same symbols and their explanations will be omitted.

〔Effect of the invention〕

As is clear from the above description, the present invention has the following remarkable effects.

■ There is no risk of exhaust gas entering the air space, eliminating deterioration and damage to the reinforced concrete chimney body due to corrosive exhaust gas.

■ The bricks used previously need to be replaced at regular intervals. However, since the chimney membrane material according to the present invention is always maintained at the same time as the exhaust gas temperature, it is not subject to deterioration or damage due to corrosive exhaust gas or temperature.

This rounding allows permanent use) and eliminates the need for large maintenance and management costs such as maintenance and inspection.

(2) The cross-sectional shape of bricks conventionally used has to be circular due to structural constraints, but according to the present invention, there is no restriction on the structural cross-sectional shape of the chimney membrane material. Therefore, the cross section of the chimney body made of reinforced concrete can be designed as desired.

(2) Since the weight of the chimney membrane material used in the present invention is approximately 1720 times the weight of conventional bricks, there is no need to make the chimney body a structure made of reinforced concrete. Therefore, it is also possible to use a steel frame structure for the chimney body, providing a degree of freedom never seen before in structural planning and design planning.

■ Traditional reinforced concrete chimneys require a lot of time and effort to stack bricks. However, according to the structure of the chimney according to the present invention, the chimney membrane material etc. can be installed in a short period of time. Therefore, the present invention has better workability than the conventional method and allows the construction period to be less than or equal to the side line.

(2) According to the present invention, the weight of the upper structure of the chimney is reduced compared to the conventional method. Therefore, the foundation concrete volume,
The number of piles and chimney site area can be reduced,
Chimney construction costs can be reduced.

[Brief explanation of the drawing]

Figure 1 (&)t (b) is a cross-sectional view and longitudinal cross-sectional view showing an embodiment of the present invention, Figure 2 is a cross-sectional view showing another embodiment of the present invention, Figure 3 (&), (b) is a cross-sectional view and a vertical cross-sectional view showing still another embodiment of the present invention, FIG. 4 is a vertical cross-sectional view showing an example of a conventional chimney, and FIGS. 5 and 6 are the same as those in FIG. The enlarged vertical cross-sectional views of portions a and b, FIG. 7, and FIG. K8 are explanatory diagrams showing the pressure distribution within the chimney. 20, 20a, 200--chimney body, 22.22a
...Chimney membrane material, 25...Air layer, 30-...
Chimney membrane expansion space. Agent Patent Attorney Sanro Kimura Go to Figure 1 9 4゜“ 2nd v! I 200 Iλf Inspection $

Claims (2)

[Claims] (1) In a chimney made of reinforced concrete or the like, a membrane type characterized in that a membrane material having airtightness and heat resistance is used as the lining material of the chimney, and expansion and contraction of the membrane material is absorbed by the expansion and contraction space of the membrane material and an air layer. chimney. (2) The membrane chimney according to claim (1), wherein the membrane material is made of a thin iron plate.