JPH04157B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention extends the lifespan of steel chimneys and provides economic efficiency in the maintenance of existing steel chimneys, making it possible to reinforce any steel chimneys. This article concerns a reinforced double-barrel structure for a steel chimney.

(Prior art) When the cylinder body of the existing steel chimney becomes severely corroded due to long-term operation of the furnace, and it becomes necessary to reinforce the cylinder body, the conventional construction structure requires that the furnace be stopped for a long period of time or a temporary chimney is constructed. In many cases, the chimney must be installed, and after the flue is replaced, it is dismantled and removed, and a new chimney is constructed at a huge cost.

For example, as mentioned in Japanese Patent Application Laid-Open No. 54-73426, there is a method of completely replacing and repairing an existing steel chimney without stopping the chimney function, but this is not a method that can partially strengthen the chimney. .

(Problems to be solved by the invention) If the conventional construction structure is adopted, there will be a negative impact on production due to long-term shutdown of the furnace, and if a hypothetical chimney is installed, the chimney may become smaller than its original size. In addition, forced exhaust equipment may be required when installing in a remote location due to the narrow construction site, resulting in issues such as the location of these installations, the time and cost required for constructing temporary structures, and furthermore, after the new chimney is completed, There is a drawback that all of these hypothetical materials become unnecessary, resulting in a large economic waste.

(Means for Solving the Problems) Therefore, the present invention solves the drawbacks of the conventional construction structure and improves the tube strength that has decreased due to corrosion, while keeping the furnace in operation and without requiring a temporary chimney. It's about providing structure.

A feature of the present invention is that in the cylinder of an existing steel chimney that requires reinforcement, a portion A of the outer circumference of the cylinder that requires reinforcement is sandwiched between the part that requires reinforcement.
A ring 2 is arranged almost at right angles to the outer surface of the existing cylinder body above which it has come off, and a ring 1 is arranged above this at an interval, and ribs 4 are arranged radially between the rings 1 and 2.
A reinforcing barrel 6 is arranged on the lower surface of the ring 2 at a substantially right angle to the ring 2 and at a constant distance from the existing barrel.
A ring 3 is arranged at a distance below the ring 2 and approximately perpendicular to the outer surface of the reinforcing cylinder, and ribs 5 are arranged radially between the rings 2 and 3, so that the outer periphery of the cylinder at the lower end needs to be reinforced. A ring 8 is arranged at a substantially right angle to the outer surface of the existing barrel below the part A, the reinforcing barrel 6 is made to reach the ring 8 at a substantially right angle, and the ring 8 is placed at an interval on the outer surface of the existing barrel below the ring 8. 7, a rib 10 is arranged radially between the rings 7 and 8, a ring 9 is arranged at a distance above the ring 8 and approximately perpendicular to the outer surface of the reinforcing cylinder, and a radial rib 10 is arranged between the rings 8 and 9. This is a steel chimney double cylinder reinforcement structure characterized by ribs 11 arranged in a shape.

(Function) Here, the reinforcing barrel 6 takes the place of the existing barrel, and also absorbs the weight or load of the chimney above the reinforcing barrel 6 through the rings 1, 2, 3, ribs 4,
5, reinforcing barrel 6 and rings 7, 8, 9, rib 1
0 and 11, it acts to transmit information to the chimney below the reinforcing cylinder body 6.

(Example) The present invention will be explained in detail based on the example shown in FIGS. 1 to 4. Upper rings 1, 2, 3 and ribs 4, 5 are arranged to reliably transmit the load from the existing cylindrical body 12, which has not suffered from a decrease in physical strength, to the reinforced cylindrical body 6. The ring 2 is placed above the part A that requires reinforcement, and the ring 1 is placed at a certain distance above the ring 2. rings 1, 2
Ribs 4 are equally divided radially in between and are connected to the rings 1 and 2 and the existing cylindrical body 12. A reinforcing cylindrical body 6 is disposed on the lower surface of the ring 2 at right angles to the ring 2 and at a constant distance from the existing cylindrical body. The distance between the existing barrel and the reinforcing barrel may be determined by measuring the diameter and roundness of the existing barrel in advance and determining the distance required for the walking barrel to form concentric circles. A ring 3 is arranged perpendicularly to the outer surface of the reinforcing cylinder at an interval below the ring 2, and ribs 5 are arranged radially and equally divided between the rings 2 and 3, and the rings 2 and 3 and the reinforcing cylinder 6 Connect to. At this time, it is preferable that the number of divisions of the ribs 4 and 5 in the circumferential direction be the same. In order to wrap around the existing cylinder body 12, the reinforcing cylinder body 6 consists of arc-shaped divided steel plates 13, 14, and 15, each of which is divided into a plurality of halves or more (described here as three parts), concentrically outside the existing cylinder body 12. Connect each assembly and further divide the steel plate 1
The reinforcing cylinder body 6 is formed by sequentially assembling the joints 3, 14, and 15 alternately.

The height B of the reinforcing barrel is determined by the capacity of the lifting machine used for construction and the suitability of the installation work.

The lower end of the reinforcing barrel 6 is connected from the reinforcing barrel 6 to the existing barrel 1.
Among the lower rings 7, 8, 9 and ribs 10, 11, which are used to reliably transmit the load to 2, the upper surface of ring 8, which is located at the lower part of the part A that requires reinforcement, is reached and connected at right angles. be done. ring 8
A ring 7 is placed at a certain interval below the . Ribs 10 are arranged radially and equally divided between the rings 7 and 8, and are connected to the rings 7 and 8 and the existing cylinder body 12. A ring 9 is arranged at a certain interval above the ring 8, and ribs 11 are arranged radially and evenly divided between the rings 8 and 9, and are connected to the rings 8 and 9 and the outer surface of the reinforcing cylinder body. Here, it is preferable that the number of divisions of the ribs 10 and ribs 11 in the circumferential direction be the same.

In this way, three stages of rings and two stages of ribs are placed on the upper and lower sides of the part A that requires reinforcement of the existing chimney structure, and a reinforcing cylinder 6 is placed in the middle.
By arranging and connecting these, the strength of the existing steel chimney can be restored without impairing the function of the chimney of the cylinder body, which has decreased strength due to corrosion and requires reinforcement. In this structure, if rings and ribs already exist, they can be used effectively. If it is necessary to reinforce the existing steel chimney from the column base, the base plates 17 and 18 of the column base fixed with foundation concrete 22 and mortar 21 and the ribs 19 around the anchor bolts 20 are fixed as shown in Figure 1 with foundation concrete 22 and mortar 21 as shown in Figure 1. It may be used as the lower ring 8 and rib 10 shown. Also,
When the beam is attached to the cylinder body like a multi-leg chimney, the upper and lower flanges 24 of the main beam 23,
The portion where 25 becomes the attachment ring 25 may be utilized as the upper ring 2 in FIG.

For part A of the existing steel chimney that requires reinforcement,
As mentioned above, the upper and lower rings and the rib-reinforced barrel increase the weight to some extent.
If this point is taken into consideration in the foundation design, the effectiveness of this structure will be further demonstrated.

(Effects of the Invention) As is clear from the above description, according to the structure of the present invention, in the maintenance of an existing steel chimney, a temporary chimney can be installed without stopping the function of the chimney while the chimney is in operation or at rest. Without installation, it restores the parts of the barrel that have lost their physical strength due to corrosion. Furthermore, according to the structure of the present invention, it is possible to reinforce any steel chimney, regardless of the reinforcement scale, location, or structural type of the existing steel chimney, eliminating all the drawbacks of conventional structures, and increasing the length of the chimney. It is economically beneficial, such as extending the service life and reducing maintenance costs, and is easy to construct.

[Brief explanation of drawings]

Fig. 1a is a half-view vertical sectional elevation view of the structure of the embodiment of the present invention showing the completed state of reinforcement of the existing steel chimney, b is the same plan view, and Fig. 2 is an elevational view showing the construction procedure of the reinforced cylinder body.
Fig. 3 is a partial cross-sectional view showing the case where the structure according to the present invention is adopted to the base of an existing steel chimney column, and Fig. 4 is a partial cross-sectional view showing the case where the structure according to the present invention is adopted to the girder joint of a multi-legged chimney. FIG. 3 is a partial cross-sectional view showing a case where 1, 2, 3... Upper ring, 4... Upper rib,
5... Lower rib, 6... Reinforced barrel, 7, 8, 9...
... lower ring, 10 ... lower rib, 11 ... upper rib, 12 ... existing cylinder body, 13, 14, 15 ...
Divided steel plate, 17... Upper base plate, 18...
...Lower base plate, 19...Rib, 20...
Anchor bolt, 21... mortar, 22... foundation concrete, 23... girder, 24... upper flange, 25... lower flange, A... portion of existing steel chimney requiring reinforcement, B... reinforcement Height of the divided steel plate of the cylinder body.

Claims (1)

[Claims] 1. In the cylinder of an existing steel chimney that requires reinforcement, approximately the outer surface of the existing cylinder above the part A that requires reinforcement on the outer periphery of the cylinder, across the part that requires reinforcement. Arrange ring 2 at a right angle, arrange ring 1 at a distance above this, ring 1,
A radial rib 4 is arranged between the ring 2, and a reinforcing cylinder 6 is arranged on the lower surface of the ring 2 at almost right angles to the ring 2 and at a constant distance from the existing cylinder. A ring 3 is arranged almost perpendicularly to the outer surface of the reinforcing cylinder, and ribs 5 are arranged radially between the rings 2 and 3. A ring 8 is arranged at a substantially right angle to the outer surface of the cylinder body, the reinforcing cylinder body 6 is made to reach the ring 8 at a substantially right angle, a ring 7 is arranged at intervals on the outer surface of the existing cylinder body below the ring 8, and the ring 7, Ribs 10 are arranged radially between rings 8 and 9, rings 9 are arranged substantially perpendicularly to the outer surface of the reinforcing cylinder body at intervals above ring 8, and ribs 11 are arranged radially between rings 8 and 9. Double barrel reinforced structure featuring.