JPH0253590B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Various methods are currently employed for constructing a chimney, and among these methods there is one in which the cylinder body is jacked up and successively joined together.

Figure 1 shows an overview of this construction method. A divided cylinder block, in which the chimney cylinder is divided into several parts in the height direction, is fabricated in advance on the ground at the site, and this is pushed up from the top side with a jack. The next split barrel block is inserted below and assembled in sequence. First, split barrel block 1 at the top of the chimney is carried in, set on pedestal 2, and joined to barrel block 1. After engaging the upper part of the push-up ring 4 with the lower surface of the stopper 3, the barrel block 1 is jacked up along the guide column 6 using the jacking device 5.

After the cylinder block 1 is pushed up to a predetermined height, the next divided cylinder block 1 is carried into the lower part of the block and welded to the upper cylinder block 7.

When the joining of the two cylinder blocks 1, 1 is completed, the engagement between the stopper 3 and the push-up ring 4 is released, and the push-up ring 4 is removed by the jack up device 5.
is lowered, and the stopper 3 of the next divided cylinder body is engaged with the push-up ring 4, and the jack-up device 5 is lowered.
The next cylinder block is pushed up, and the next divided cylinder block is carried under it.

Thereafter, the entire cylinder body is constructed by repeating the same steps as above.

Although not shown, a rotating crane is mounted on the top of the barrel, and the crane is used to simultaneously assemble a support steel frame for supporting the barrel from around the barrel.

2 to 4 show the engagement relationship between the stopper 3 and the push-up ring 4, and the two are engaged through a push-up support ring 8 attached to the push-up ring 4. This push-up support ring 8 is divided into two or three parts in the circumferential direction, and when setting it, it is inserted closely between the lower surface of the stopper 3 and the upper surface of the push-up ring 4, or After inserting the support ring 8, the push-up ring 4 is moved upward a little to bring it into close contact, and then fastened with bolts 9 or the like to transmit the load.

Therefore, in the above-mentioned erection process, when the connection between the upper and lower cylinder blocks is completed and the push-up ring 4 is to be lowered for the next jacking, the bolts 9 are loosened and the push-up support ring 8 is divided. , the stopper 3 expands outward from the outer circumference of the push-up ring 4.
To prevent the lower barrel support ring from becoming an obstacle and making it impossible to lower the push-up ring 4.

In this way, in the conventional erection method, when pushing up the cylinder body with a jack up device, only the stopper is used to push it up, so there are many steps to install the stopper, and this stopper is an erection jig. This is a factor that increases construction costs.

The present invention was proposed in order to solve these problems, and is fixed to the outer peripheral surface of the connection part with the steel tower in the cylinder block of the steel tower type chimney, and transmits the horizontal force acting on the block to the steel tower. The outer diameter of the support ring for reinforcing the cylinder body is formed to be smaller than the inner diameter of the push-up ring in the barrel push-up device, and larger than the inner diameter of the push-up support ring supported by the push-up ring. A push-up support ring is engaged with the barrel reinforcing support ring, and the push-up device pushes the barrel block through the push-up ring, the push-up support ring, and the barrel reinforcement support ring. This invention relates to a method for constructing a tower-type chimney barrel by pushing up the barrel, which is characterized by assembling the barrel by pushing up the barrel one by one.

In the tower-type chimney to which the method of the present invention is applied, support rings are arranged on the outer circumferential surface of the cylinder at intervals of 20 to 30 m in height in order to transmit the horizontal force acting on the cylinder to the tower and support it with the tower. It is set up.

Conventionally, large chimneys have a depth of 300 mm in the radial direction of the cylinder.
A support ring with a T-shaped or groove-shaped cross section of about 350 mm and a height of about 400 mm was attached.

When a steel tower type chimney is jacked up as described above, the top of the cylinder is supported from the outer periphery by rollers, etc. temporarily installed on the assembled steel tower part on the outer periphery, and this is guided. Since the cylinder body is jacked up as a result, the support ring cannot be fixed to the cylinder body from the beginning. For this reason, the support ring to be attached to this cylinder is, for example, lifted to the height of the support point that supports the cylinder of the steel tower part that has been assembled, and temporarily fixed to the tower side, so that it can be used as a passage or a guide roller when the cylinder is jacked up. A tube body that is used as an attachment point, or when building other tube bodies and steel towers using the rotating crane at the top of the tube, press-fits a wooden arrow between the tube body and the ring to fix the tube body. It is common to use it as a fixing ring, and after the jack-up barrel has risen to its full height, the barrel support ring on the steel tower is removed and fixed by welding to the outer surface of the barrel.

Therefore, as shown in the above-mentioned conventional device, the jack up barrel is provided with a stopper of relatively small radial depth on each barrel block, in addition to the support ring, for engaging the push-up ring of the jack up device. It is welded and fixed. As a result, as mentioned above, the number of mounting stages of the stopper, which is an erection jig, is large, which is a factor in increasing construction costs.

However, according to the present invention, as described above, a support ring for reinforcing the cylinder body is fixed to the steel tower connecting portion of the cylinder block in the steel tower type chimney, and the support ring is for transmitting the horizontal force acting on the cylinder block to the steel tower. The outer diameter of the support ring for reinforcing the cylinder body is smaller than the inner diameter of the push-up ring in the barrel push-up device, and larger than the inner diameter of the push-up support ring supported by the push-up ring, By substituting the conventional stopper for the support ring for reinforcing the cylinder body, the engagement member that engages with the push-up ring when the cylinder block is jacked up can also be used, and each cylinder block to be connected can be fixing the cylinder reinforcing support ring on the ground and engaging it with a push-up support ring supported by a push-up ring in a push-up device;
The construction jig is assembled by operating the lifting device to sequentially push up the cylinder block through the push-up ring, the support ring for pushing up, and the support ring for reinforcing the cylinder body, and assemble the chimney cylinder. This reduces the number of stoppers, simplifies the process, and significantly reduces construction costs.

The present invention will be described below with reference to the illustrated embodiments.

Reference numeral 11 indicates a cylindrical block in a steel tower type chimney that is jacked up by a lifting device.
A support ring 12 for reinforcing the cylinder body, which is configured to transmit the horizontal force acting on the steel tower 1 to the steel tower, is fixed thereto, and also serves as a stopper in the conventional construction method.

The outer diameter of the support ring 12 for reinforcing the cylinder body is smaller than the inner diameter of the push-up ring 14 in the push-up device, and larger than the inner diameter of the push-up support ring 13 supported by the push-up ring 14. has been done.

Then, the push-up support ring 13 is engaged with the cylinder-reinforcing support ring 12, the push-up device is operated, and the push-up ring 14, the push-up support ring 13, and the cylinder-reinforcement support ring are engaged. The cylinder blocks 11 are sequentially jacked up and assembled via the chimney cylinder 14 to construct a chimney cylinder.

The support ring 12 for reinforcing the cylinder body is a member with a groove-shaped cross section that has the minimum possible protrusion length in the radial direction of 175 mm, whereas the conventional support ring had a protrusion length in the radial direction of 300 to 350 mm. By increasing the cross-sectional plate thickness or increasing the dimension in the height direction compared to the conventional support ring, the support ring is sufficiently reinforced against bending stress applied to the cylindrical body.

According to the embodiment described above, by using the support ring 12 for reinforcing the cylinder body, which is a structural member, as a stopper, the number of steps of the stopper, which is an erection jig material, can be reduced, and the total cost of chimney construction can be reduced. It is.

[Brief explanation of the drawing]

Figure 1 is a front view showing the state of implementation of the conventional method for constructing a chimney barrel, Figures 2 and 3 are a front view and a partial longitudinal sectional view of the main parts, respectively, and Figure 4 is an enlarged longitudinal sectional view. , FIG. 5 is a vertical cross-sectional view of a main part showing the implementation status of one embodiment of the method for pushing up a chimney barrel according to the present invention. 11...Cylinder block, 12...Cylinder reinforcement support ring, 13...Push-up support ring, 14...
...Push-up ring.

Claims (1)

[Claims] 1. The outer diameter of the support ring for reinforcing the cylinder, which is fixed to the outer circumferential surface of the connection part with the steel tower in the cylinder block of the steel tower type chimney, and which transmits the horizontal force acting on the block to the steel tower, is Formed to have a smaller diameter than the inner diameter of the lifting ring and a larger diameter than the inner diameter of the lifting support ring supported by the lifting ring,
The push-up support ring is engaged with the barrel reinforcement support ring, and the push-up device pushes the barrel block through the push-up ring, the push-up support ring, and the barrel reinforcement support ring. A method for pushing up a steel tower type chimney barrel, which is characterized by assembling the barrel by pushing up the barrel in sequence.