JP2018168601A - Dismantling method of chimney supported with steel tower - Google Patents

Abstract

To provide a dismantling method of a chimney supported with a steel tower, in which an elevator is installed, to enable easily, safely and securely dismantling the chimney supported with the steel tower without using a large crane.SOLUTION: A dismantling method comprises: cutting a first section of a steel tower 2 into two steel tower blocks 2a after connecting the first section of the steel tower to a second section of the steel tower 2 with a hinge 8; then, tumbling the steel tower blocks 2a downward with the hinge 8 as a supporting point using a jack 5 for tumbling the steel tower block and a jack 7 for guiding the steel tower block; then, lifting down the steel tower blocks 2a through operating a jack 6 for lifting down the steel tower block, the jack 5 for tumbling the steel tower block, and the jack 7 for guiding the steel tower block, after cutting the hinge 8 off the steel tower 2; then, lifting down a cylindrical body 1 with a jack 4 for lifting the cylindrical body after cutting a lower section of the cylindrical body 1; and repeating the above processes, to enable easily, safely, and securely dismantling a chimney supported with a steel tower without using a large crane.SELECTED DRAWING: Figure 5(a)

Description

  The present invention relates to a method for dismantling a tower-supported chimney, and more particularly to a method for dismantling a tower-supported chimney that can be easily and safely disassembled without using a large crane. .

  An example of a method for dismantling a steel tower support chimney is disclosed in Patent Document 1. The following method of dismantling the steel tower supported chimney is called a conventional dismantling method and will be described with reference to the drawings.

  9A and 9B are explanatory views showing a conventional dismantling method, in which FIG. 9A is a diagram in which the cylindrical body 11A is removed, FIG. 9B is a diagram in which the cylindrical body 11B is removed, and FIG. 9C is a diagram of a steel tower by a crawler crane. The figure which removed the cylinder 11C and the cylinder 11D after removing the intermediate part 12B, (d) is the figure which changed the hanging position of the cylinder with a jack, (e) is the cylinder 11I from the cylinder 11E. The figure which removed, (f) is the figure which changed the hanging position of the cylinder with a jack, (g) is a figure which disassembles the top part of a cylinder.

  The conventional dismantling method includes the following steps.

(First barrel part disassembly process)
First, as shown in FIG. 9A, the cylindrical body 11 is partially disassembled. That is, the jack 15 is attached to the second support point S2 of the tower 12, and the lower end of the cylinder 11 is cut by a predetermined length at the cutting position 20 while the cylinder 11 is supported by the jack 15, and the cut cylinder 11A is cut. After mounting on the transport carriage 21 and removal, the barrel 11 is jacked down. At this time, the jack-down operation can be easily and safely performed by supporting and guiding the jack-down of the cylindrical body 11 by the guide roller 16 provided in the steel tower 12 which is stably standing independently. In addition, 17 and 18 in a figure are a reinforcement material, 22 is a rail for the conveyance trolley | bogie 21 to drive | work. Then, by cutting and removing the lower end portion of the cylinder 11 and jacking down as described above, the cylinder 11B is cut and removed as shown in FIG. Disassemble until point S4 is reached.

(Steel tower middle part dismantling process)
Next, in a state where the upper portion 12A of the steel tower 12 is held by the cylinder 11, the intermediate portion 12B of the steel tower 12 is dismantled and removed using a crawler crane 30 as shown in FIG. Here, the upper portion 12A of the steel tower 12 is a portion between the third support point S3 and the fourth support point S4, and the intermediate portion 12B of the steel tower 12 is between the second support point S2 and the third support point S3. The part between.

(Second barrel part disassembly process)
Next, in the same manner as in the above-described tube body part disassembly process, the tube body 11C and 11D are cut and removed as shown in FIG. Then, the upper part 12A of the steel tower 12 is dismantled and removed until the position approaches the lower part 12C of the steel tower 12. Here, the lower part 12C of the steel tower 12 is a part below the second support point S2.

(Steel tower upper dismantling process)
Next, as shown in FIG. 9D, the suspension position of the cylinder 11 by the jack 15 is changed, and the upper portion 12 </ b> A of the steel tower 12 is dismantled and removed using the crawler crane 30.

(Third cylinder body disassembly process)
Next, in the same manner as the above-described cylinder body part disassembling process and second cylinder body part disassembling process, the cutting and removal of the lower end part of the cylinder 11 and the jackdown are repeated, and FIG. 9D and FIG. e) As shown in FIG. 9F, the cylinders 11E to 11M are sequentially cut and removed.

(Lower dismantling process of the tower)
Finally, using the crawler crane 30, the lower part 12C of the steel tower 12 and the remaining cylinder 11 are dismantled and removed. This completes the dismantling of the tower-supported chimney 10 as shown in FIG.

Japanese Patent No. 4559313 Japanese Patent No. 5556397 Japanese Patent No. 2828430

  According to the above conventional dismantling method, the tower-supported chimney can be dismantled safely and reliably without using a super large crane corresponding to the height of the chimney, but for removing the towers 12A and 12B at the high places. There was a problem of requiring a large crane.

  Accordingly, an object of the present invention is to provide a method of dismantling a tower-supported chimney that can easily and safely dismantle the tower-supported chimney without using a large crane.

  The present invention has been made to achieve the above object, and is characterized by the following.

The invention according to claim 1 is a dismantling method of a tower-supported chimney in which a steel tower that supports the cylinder is constructed around a plurality of cylinders, and includes the following steps (a) to (h):
(A) At the bottom of the steel tower, a cylinder lifting jack capable of lifting the cylinder is installed, and at the top of the cylinder, a steel tower block tilting jack is used to tilt the cut steel tower block as a fulcrum, A jack installation step of installing a tower block suspension jack for hanging the tower block, and installing a tower block guide jack for guiding the tower block suspended by the tower block suspension jack on the ground,
(B) a connecting step of connecting the lower part of the upper stage of the steel tower and the upper part of the next stage of the steel tower with a hinge;
(C) a steel tower cutting step of cutting the upper stage of the steel tower into a plurality of steel tower blocks;
(D) a tower block tilting step of operating the tower block tilting jack and the tower block guide jack to tilt the tower block downward with the hinge as a fulcrum;
(E) a hinge separating step for separating the hinge from the steel tower;
(F) a tower block hanging step of hanging the tower block by operating the tower block hanging jack, the tower block falling jack, and the tower block guide jack;
(G) After the upper stage of the steel tower is disassembled by the steps (b) to (f), the lower part of the cylinder is cut in a state where the load of the cylinder is left in the cylinder lifting jack. And the barrel cutting and removing process to be removed,
(H) a cylinder hanging process of hanging the cylinder with the cylinder lifting jack;
The step (b) to the step (h) are characterized in that they are repeated in sequence from the upper stage to the lower stage of the tower.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the number of the cylinders is four.

  The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the steel tower has a square planar shape.

  The invention according to claim 4 is characterized in that, in the invention according to any one of claims 1 to 3, the steel tower block has a U-shaped planar shape and is composed of two. is there.

  According to this invention, the lower part of the upper stage of the steel tower and the upper part of the next stage of the steel tower are connected by a hinge, then the upper stage of the steel tower is cut into a plurality of steel tower blocks, and then the steel tower block is hinged on the hinges Without using a large crane by tilting downward, then separating the hinge from the tower, then hanging the tower block, then cutting the bottom of the barrel and then repeatedly hanging the barrel The tower-supported chimney can be easily and safely disassembled.

The tower-supported chimney in which the tube-lifting jack, the tower block-lowering jack, the tower block-suspending jack, and the tower-block guide jack are installed by the dismantling method of the tower-supporting chimney of the present invention is shown. It is a top view. It is an enlarged view of the installation part of the steel tower block fall jack, the steel tower block hanging jack, and the steel tower block guide jack. It is an enlarged view of the installation part of the cylinder lifting jack. It is a top view which shows a chimney. It is a front view which shows the process of suspending the steel tower block of the 1st step | level (uppermost stage) of a steel tower by the dismantling method of the steel tower support type chimney of this invention. It is a front view which shows the process of cut | disconnecting and removing the lower part of a cylindrical body after this dismantling the 1st step | paragraph of a steel tower by the dismantling method of the steel tower support type chimney of this invention, and then suspending a cylindrical body. It is a front view which shows the process of replacing the cylinder lifting jack by the dismantling method of the steel tower support type chimney of this invention. It is a front view which shows the process of suspending the 2nd steel tower block of a steel tower by the dismantling method of the steel tower support type chimney of this invention. It is a front view which shows the process of cut | disconnecting the lower part of a cylindrical body after removing the 2nd step | paragraph of a steel tower by the dismantling method of the steel tower support type chimney of this invention, removing it, and suspending a cylindrical body after that. It is a front view which shows the process of replacing the cylinder lifting jack by the dismantling method of the steel tower support type chimney of this invention. It is a front view which shows the process of hanging the 3rd-stage steel tower block of a steel tower by the dismantling method of the steel tower support type chimney of this invention. It is a front view which shows the process of cut | disconnecting and removing the lower part of a cylindrical body after this disassembling the 3rd stage of a steel tower by the dismantling method of the steel tower support type chimney of this invention, and then suspending a cylindrical body. It is a front view which shows the process of replacing the cylinder lifting jack by the dismantling method of the steel tower support type chimney of this invention. It is a front view which shows the process of hanging the 4th-stage steel tower block of a steel tower by the dismantling method of the steel tower support type chimney of this invention. It is a front view which shows the process of cut | disconnecting the lower part of a cylinder after removing the 4th step | paragraph of a steel tower by the dismantling method of the steel tower support type chimney of this invention, and then removing, and then hanging down a cylinder. It is a front view which shows the process of replacing the cylinder lifting jack by the dismantling method of the steel tower support type chimney of this invention. It is a front view which shows the process of hanging the tower block fall jack, the tower block suspension jack, and the tower block guide jack with a crane by the dismantling method of the tower support type chimney of this invention. It is a front view which shows the process of removing after removing the lower part of a cylinder by the dismantling method of the steel tower support type chimney of this invention, and removing it after this. It is a front view which shows the process of replacing the cylinder lifting jack by the dismantling method of the steel tower support type chimney of this invention. It is a front view which shows the process of removing after removing the lower part of a cylinder by the dismantling method of the steel tower support type chimney of this invention, and removing it after this. It is a front view which shows the process of removing a cylinder top part by the dismantling method of the steel tower support type chimney of this invention. It is a front view which shows the process of removing the cylinder lifting jack with a crane by the dismantling method of the steel tower support type chimney of this invention. It is a front view which shows the process of demolishing the lowest stage (5th stage) of a steel tower by the method of demolishing a steel tower support type chimney of this invention. It is a front view which shows a hinge part. It is a side view which shows a hinge part. It is a front view which shows the state which fell down the steel tower block by using a hinge as a fulcrum. It is the figure which removed 11 A of cylinders by the conventional dismantling method. It is the figure which removed the cylinder 11B with the conventional dismantling method. It is the figure which removed the cylinder 11C and the cylinder 11D after removing the intermediate part 12B of the steel tower with the crawler crane by the conventional dismantling method. It is the figure which changed the hanging position of the cylinder with a jack by the conventional dismantling method. It is the figure which removed the cylinder 11I from the cylinder 11E by the conventional dismantling method. It is the figure which changed the hanging position of the cylinder with a jack by the conventional dismantling method. It is a figure which disassembles the top part of a cylinder body by the conventional dismantling method.

  An embodiment of a method for dismantling a steel tower supported chimney according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a tower support in which a barrel lifting jack, a tower block falling jack, a tower block hanging jack, and a tower block guide jack are installed according to the dismantling method of the tower-supported chimney of the present invention. FIG. 2 is an enlarged view of an installation portion of a tower block tilting jack, a tower block suspension jack, and a tower block guide jack, and FIG. 3 is an installation of a cylinder lifting jack. FIG. 4 is a plan view showing a chimney.

  In FIG. 1 to FIG. 4, reference numeral 1 denotes a plurality of (in this example, four) cylinders, and 2 denotes a steel tower that is constructed outside the four cylinders 1 and supports the cylinders 1. In this example, as shown in FIG. 1, the tower 2 is divided into five stages, that is, the first stage (uppermost stage), the second stage, the third stage, the fourth stage, and the fifth stage (lowermost stage). Dismantle and remove. As shown in FIG. 4, the steel tower 2 has a square shape in plan view.

  Reference numeral 3 denotes an elevator shaft (see FIG. 4) installed at the center of the four cylinders 1, and the elevator is used, for example, when building a scaffold.

  Reference numeral 4 denotes a barrel lifting jack that is installed in the lower part of the steel tower 2 and can lift the barrel 1. As the cylinder lifting jack 4, for example, a large jack disclosed in Patent Document 2 is used.

  Reference numeral 5 denotes a tower block tilting jack installed at the top of the barrel 1 and used when a tower block 2a having a cut U-shape that has been cut, which will be described later, is tilted with a hinge 8 described later as a fulcrum. is there.

  6 is a tower block hanging jack installed at the top of the barrel 1 and is used when hanging the tower block 2a.

  7 is a tower block guide jack installed on the ground, which is used to guide the tower block 2a suspended by the tower block suspension jack 6.

  As the steel tower block tilting jack 5, the steel tower block hanging jack 6, and the steel tower block guide jack 7, for example, a small jack disclosed in Patent Document 3 is used.

  8 is a hinge which connects the lower part of the steel tower block 2a and the upper part of the uncut steel tower 2;

  Next, a method for disassembling a chimney according to a method for disassembling a steel tower supported chimney according to the present invention will be described.

(A) Process (jack installation process)
First, as shown in FIGS. 5 (a), 2, and 3, a barrel lifting jack 4 capable of lifting the barrel 1 is installed at the lower portion of the tower 2, and is cut at the top of the barrel 1. The tower block tilting jack 5 for tilting the tower block 2a with the hinge 8 as a fulcrum and the tower block hanging jack 6 for hanging the tower block 2a are installed and suspended on the ground by the tower block hanging jack 6. A steel tower block guide jack 7 is installed to guide the steel tower block 2a.

(B) Process (linking process)
Next, as shown in FIGS. 5A and 2, the first stage of the tower 2, that is, the lowermost part of the upper part of the tower 2, and the second stage of the tower 2, that is, the upper part of the next stage are hinged. 8 is connected.

(C) Process (steel tower cutting process)
Next, the first stage of the steel tower 2 is cut into two planar U-shaped steel tower blocks 2a. That is, as shown by the cutting line (AA) in FIG. 2 and FIG. 5A, the first stage of the steel tower 2 is cut in the height direction, and the cutting line in FIG. ), The steel tower at the hinge 8 portion is cut in the horizontal direction.

(D) (Steel block defeating process)
Next, as shown in FIG. 5A, the steel tower block tilting jack 5 and the steel tower block guide jack 7 are operated to tilt the first steel tower block 2a downward with the hinge 8 as a fulcrum.

(E) (Hinge separation process)
Next, the hinge 8 is separated from the steel tower 2. The cutting line at this time is indicated by (CC) in FIG.

(F) (Steel block hanging process)
Next, as shown in FIG. 5 (a), the tower block hanging jack 6, the tower block tilting jack 5, and the tower block guide jack 7 are operated to remove the first tower block 2a. Hanging on the ground. That is, the steel tower block 1a is suspended while adjusting the steel tower block hanging jack 6 and the steel tower block tilting jack 5, and the steel tower block guide jack 7 is stretched near the ground to gradually remove the steel tower block 1a. Return to level and sit on the ground.

(G) (Cylinder cutting and removal process)
Next, after the first stage of the steel tower 2 is disassembled by the steps (b) to (f), the lower portion of the barrel 1 is placed in a state where the load of the barrel 1 is left in the barrel lifting jack 4. Cut and remove. The cutting line at this time is indicated by (DD) in FIG. 5B (the same applies to the steps described later).

(H) Cylinder suspension process Next, as shown in FIG.5 (b), the cylinder 1 is suspended on the ground for every cutting and removal with the cylinder lifting jack 4. FIG. The elevator shaft 3 is cut and removed when the cylinder 1 is cut. The same applies to the following steps.

  When the first stage dismantling of the tower 2 is completed in this way, the process (b) to the process (h) are repeated sequentially from the second stage to the fourth stage of the tower 2.

  That is, after the disassembly of the first stage of the tower 2 is completed, as shown in FIG. 5 (c), after the tube lifting jack 4 is replaced, as shown in FIG. The lower part of the stage and the upper part of the third stage of the steel tower 2 are connected by a hinge 8.

  Next, the second stage of the tower 2 is cut into two planar U-shaped tower blocks 2a.

  Next, as shown in FIG. 5 (d), the steel tower block tilting jack 5 and the steel tower block guide jack 7 are operated to tilt the second steel tower block 2 a downward with the hinge 8 as a fulcrum.

  Next, the hinge 8 is separated from the steel tower 2.

  Next, the steel tower block hanging jack 6, the steel tower block falling jack 5, and the steel tower block guide jack 7 are operated to suspend the second steel tower block 2a on the ground.

  Next, after the second stage of the steel tower 2 is disassembled by the above process, the lower part of the cylinder 1 is cut and removed in a state where the load of the cylinder 1 is left in the cylinder lifting jack 4.

  Next, as shown in FIG. 5 (e), the barrel 1 is suspended from the ground by the barrel lifting jack 4 every time the barrel 1 is cut and removed.

  Next, as shown in FIG. 5 (f), after the cylinder lifting jack 4 is replaced, as shown in FIGS. 5 (g) to 5 (j), the third to fourth steps of the steel tower 2. The same process is repeated for the eyes to dismantle the steel tower 2 in the third to fourth stages.

  When the disassembly of the first to fourth stages of the steel tower 2 is completed in this way, as shown in FIG. 5 (k), the barrel 1 is put on the ground every time it is cut and removed by the barrel lifting jack 4. Hanging down.

  Next, as shown in FIG. 5 (l), the barrel lifting jack 4 is replaced.

  Next, as shown in FIG. 5 (m), the crane block 9 and the steel tower block hanging jack 6 are suspended on the ground by the crane 9.

  Next, as shown in FIG. 5 (n), the lower portion of the barrel 1 is cut and then removed, and then the barrel 1 is suspended by the barrel lifting jack 4.

  Next, as shown in FIG. 5 (o), the barrel lifting jack 4 is replaced.

  Next, as shown in FIG. 5 (p), the lower portion of the barrel 1 is cut and then removed, and thereafter, the step of hanging the barrel 1 with the barrel lifting jack 4 is repeated.

  Next, as shown in FIG. 5 (q), the cylinder top 1a is removed.

  Next, as shown in FIG. 5 (r), the barrel lifting jack 1b is removed by the crane 9.

  Next, as shown in FIG. 5 (s), the fifth stage of the steel tower 2 is disassembled.

  As described above, the tower-supported chimney can be disassembled according to the present invention.

  According to this invention, after connecting the first stage of the tower 2 and the second stage of the tower by the hinge 8, the first stage of the tower 2 is cut into two tower blocks 2a, and then the tower block 2a is The hinge 8 is used as a fulcrum and the tower block tilting jack 5 and the tower block guide jack 7 are tilted downward. Next, after the hinge 8 is separated from the tower 2, the tower block 2a is suspended from the tower block jack 6, and the tower The block tilting jack 5 and the tower block guide jack 7 are operated and suspended, and then the lower portion of the barrel 1 is cut, and then the barrel 1 is suspended by the barrel lifting jack 4. Thus, the tower-supported chimney can be easily and securely disassembled without using a large crane.

1: Tube 1a: Tube top 2: Steel tower 2a: Steel tower block 3: Elevator shaft 4: Jack for lifting steel pipe 5: Jack for lifting steel tower block 6: Jack for hanging steel tower block 7: Jack for steel tower block guide 8 : Hinge 9: Crane 11: Tube 12: Steel tower 15: Jack 16: Guide roller 17: Reinforcement material 18: Reinforcement material 20: Cutting position 21: Carriage truck 22: Rail 30: Crawler crane

Claims (4)

In a dismantling method of a tower-supported chimney in which a steel tower that supports the cylinder is constructed around a plurality of cylinders, the following steps (a) to (h) are provided,
(A) At the bottom of the steel tower, a cylinder lifting jack capable of lifting the cylinder is installed, and at the top of the cylinder, a steel tower block tilting jack is used to tilt the cut steel tower block as a fulcrum, A jack installation step of installing a tower block suspension jack for hanging the tower block, and installing a tower block guide jack for guiding the tower block suspended by the tower block suspension jack on the ground,
(B) a connecting step of connecting the lower part of the upper stage of the steel tower and the upper part of the next stage of the steel tower with a hinge;
(C) a steel tower cutting step of cutting the upper stage of the steel tower into a plurality of steel tower blocks;
(D) a tower block tilting step of operating the tower block tilting jack and the tower block guide jack to tilt the tower block downward with the hinge as a fulcrum;
(E) a hinge separating step for separating the hinge from the steel tower;
(F) a tower block hanging step of hanging the tower block by operating the tower block hanging jack, the tower block falling jack, and the tower block guide jack;
(G) After the upper stage of the steel tower is disassembled by the steps (b) to (f), the lower part of the cylinder is cut in a state where the load of the cylinder is left in the cylinder lifting jack. And the barrel cutting and removing process to be removed,
(H) a cylinder hanging process of hanging the cylinder with the cylinder lifting jack;
A method of dismantling a tower-supported chimney, wherein the steps (b) to (h) are repeated sequentially from the upper stage to the lower stage of the tower.   The method of disassembling a tower-supported chimney according to claim 1, wherein the number of the cylinders is four.   3. The method of disassembling a tower-supported chimney according to claim 1 or 2, wherein the tower has a square shape in plan view.   The method of disassembling a tower-supported chimney according to any one of claims 1 to 3, wherein the tower block has a U-shaped planar shape and is composed of two.

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