JP2013108324A - Demolition method of towering structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a demolition method of a towering structure capable of safely demolishing a towering structure such as a regenerator for a blast furnace stove in a short time and at a low cost without using a large-sized crane.SOLUTION: In a method of demolishing a regenerative furnace 1 by successively and repeatedly performing demolition work of horizontally cutting the regenerative furnace 1 as a towering structure to be demolished and then removing a cut block from a lower part to an upper part of the regenerative furnace 1, a plurality of expandable heavy object lifting devices 2 are installed around the regenerative furnace 1, the heavy object lifting devices 2 are connected to each other by an upper beam 3A, a main beam 3B and a lower beam 3C, a jack 5 is attached to the heavy object lifting device 2 through the main beam 3B, and a step of cutting the lower part of the regenerative furnace 1, lifting the regenerative furnace 1 above a cut part by the jack 5, removing the cut block, lifting down the regenerative furnace 1 by the jack 5, cutting the lower part of the regenerative furnace 1 and removing the cut block is repeatedly performed.

Description

  The present invention can dismantle a tower-like structure such as a heat storage room for a hot blast furnace in a blast furnace safely and in a short time without using a large crane, in particular, without using a large crane. The present invention relates to a dismantling method for a tower-like structure.

  Conventionally, for example, a large-sized crane has been used to dismantle a hot blast furnace heat storage chamber of a blast furnace that is built in an ironworks and has a height of several tens of meters. However, when there was no installation space for a large crane around the heat storage chamber, it had to be disassembled by another dismantling method that did not use a large crane.

  Therefore, the development of a demolition method for tower structures that can dismantle tower structures such as blast furnace hot stove regenerators safely, in a short time and at low cost without using a large crane is strong. It was desired.

  Patent Document 1 (Japanese Patent Laid-Open No. 2000-319709) discloses a blast furnace demolition method that does not use a large crane. Hereinafter, this dismantling method is called a conventional dismantling method and will be described with reference to the drawings.

  FIG. 9 is a view showing an existing blast furnace before disassembly, FIG. 10 is an explanatory view of a procedure for laying a transfer rail, and FIG. 11 is an explanatory view of a disassembly procedure for each divided block excluding the furnace bottom.

  In the conventional dismantling method, first, as shown in FIG. 9, a gantry 33 is constructed below a support column 32 of a furnace body 31 of a blast furnace as a tower-like structure, and the furnace body 31 is made up of a plurality of ring-shaped blocks (A ) To (F). The height of the lowermost ring-shaped block (F) and the height of the gantry 33 are equal.

  Next, as shown in FIG. 10, after the furnace body 31 above the ring-shaped block (F) is lifted by the jack 34 installed on the support pillar 32, it extends over the base 33 and the lower part of the ring-shaped block (E). Rail 35 is laid.

  Next, after the carriage 36 traveling on the rail 35 is moved below the ring-shaped block (E), the furnace body 31 is suspended and placed on the carriage 36.

  Next, as shown in FIG. 11, the upper furnace body 31 is lifted by the jack 34 from the ring-shaped block (E).

  Then, the ring-shaped block (E) is moved onto the gantry 33 by the carriage 36 and carried out by being cut into a plurality of blocks.

  The furnace body 31 is disassembled by repeating the above steps for the ring blocks (D) to (A). Note that the lowermost ring-shaped block (F) is disassembled into a plurality of blocks and conveyed without being moved by the carriage 36.

JP 2000-319709 A JP 2009-102972 A Japanese Patent No. 2828430

  According to the above-described conventional dismantling method, the blast furnace can be dismantled without using a large crane, but there are the following problems.

  (A) Although it is necessary to construct a large support pillar 32 capable of covering the furnace body 31 of the blast furnace as a temporary frame, reinforcement for supporting a large load is necessary. It is dangerous.

  (B) It is necessary to construct a gantry 33 for carrying out (F) from the ring-shaped block (A).

  (C) Although it is necessary to install the jack 34 for lifting the blast furnace between the furnace body 31 and the support column 32, this work is a high place work and is dangerous.

  Accordingly, an object of the present invention is to provide a tower-like structure that can safely and quickly dismantle a tower-like structure such as a heat storage room for a hot blast furnace in a blast furnace without using a large crane. The purpose is to provide a demolition method.

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

  In the first aspect of the present invention, the tower-like structure to be demolished is horizontally cut, and then the dismantling operation for removing the cut block is sequentially repeated from the lower part to the upper part of the tower-like structure. In the dismantling method of the tower-like structure, disassembling the tower-like structure by installing a plurality of extendable heavy lifting devices as temporary frames around the tower-like structure, They are connected to each other by beams, and a jack is attached to the heavy lifting device via the beams, the lower part of the tower-like structure is cut, and then the tower-like structure above the cutting position is cut by the jack. Lift, then remove the cut block, then suspend the tower structure with the jack, then cut the lower part of the tower structure and remove the cut block Those characterized by a repeating the extent.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, a guide member is attached to the beam member to guide the tower-like structure when lowered.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the position of the beam connecting between the tops of the heavy lifting devices is the center of gravity of the tower-like structure. It is characterized by adjusting the height of the heavy article lifting device.

  The invention according to claim 4 is characterized in that, in the invention according to any one of claims 1 to 3, the tower-like structure is a heat storage chamber for a hot blast furnace of a blast furnace.

  According to the present invention, the following effects are brought about.

  (A) By using a heavy lifting device that can be expanded and contracted as a temporary frame, the temporary frame can be easily constructed, and standardization of the temporary frame and diversion of other tower-like structures are possible. As a result, disassembly costs can be reduced.

  (B) According to the conventional dismantling method, it is necessary to construct a large temporary frame that can cover the entire tower-like structure. However, the construction work of the large temporary frame is a high place work and is dangerous. . On the other hand, since the heavy lifting device can be extended and contracted, the construction work of the heavy lifting device can be performed in a lowland and is safe.

  (C) If the height of the heavy lifting device is adjusted so that the center of gravity of the tower-shaped structure before dismantling comes to the top of the heavy lifting device, the heavy lifting device is constructed over the entire tower structure. Therefore, the tower-like structure can be stably supported. This stable support effect is further improved by attaching the guide member to the heavy lifting device.

It is a top view which shows the heavy article raising / lowering apparatus installed around the thermal storage chamber. It is a front view which shows the heavy article raising / lowering apparatus installed in the circumference | surroundings of a thermal storage chamber. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a front view which shows a heavy article raising / lowering apparatus. It is a top view which shows a heavy article raising / lowering apparatus. It is a front view which shows the process of fixing a hanging metal fitting to a thermal storage chamber among the processes of the demolition construction method of a tower-shaped structure of this invention. It is a front view which shows the process of cut | disconnecting block B1 among the processes of the demolition construction method of a tower-shaped structure of this invention. It is a front view which shows the process of removing the cut | disconnected block B1 among the processes of the demolition construction method of a tower-shaped structure of this invention. It is a front view which shows the process of lowering | hanging the thermal storage chamber after a cutting | disconnection among the processes of the dismantling method of a tower-like structure of this invention. It is a front view which shows the process of cut | disconnecting block B2, after changing the suspension position by a suspension metal fitting among the processes of the demolition construction method of a tower-shaped structure of this invention. It is a front view which shows the process of lowering | removing the thermal storage chamber demolished until the top part of a furnace comes to the top part of a heavy article raising / lowering apparatus among the processes of the dismantling method of a tower-like structure of this invention. It is a front view which shows the process of changing the position of a hanging metal fitting after removing a furnace top part among the processes of the dismantling method of a tower-shaped structure of this invention. It is a front view which shows the process of removing the cut | disconnected block B3 among the processes of the dismantling method of a tower-shaped structure of this invention. It is a front view which shows the process of lowering | hanging the thermal storage chamber after a cutting | disconnection among the processes of the dismantling method of a tower-like structure of this invention. It is a front view which shows the process of lowering the last block Bn among the processes of the demolition construction method of a tower-shaped structure of this invention. It is a front view which shows the process of removing the last block Bn among the processes of the demolition construction method of a tower-shaped structure of this invention. It is a partially omitted sectional view showing a hydraulic jack device. It is the figure which showed the existing blast furnace before demolition. It is explanatory drawing of the laying point of the rail for conveyance. It is explanatory drawing of the disassembly point of each division | segmentation block except a furnace bottom part.

  An embodiment of the tower-like structure dismantling method of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing a heavy lifting device installed around the heat storage chamber, FIG. 2 is a front view showing the heavy lifting device installed around the heat storage chamber, and FIG. FIG. 4 is a cross-sectional view taken along the line -A, and FIG. 4 is a cross-sectional view taken along the line BB in FIG.

  1 to 4, reference numeral 1 denotes a blast furnace hot stove regenerator (No. 1) as a tower-like structure to be dismantled, which has a cylindrical shape and a height of several tens of meters. . A hot stove equipped with a heat storage chamber and a combustion chamber is a furnace that creates hot air sent from the tuyere's tuyeres into the furnace, and a plurality of hot blast furnaces are provided for each blast furnace. Repeatedly and alternately the air blowing state.

  Reference numeral 2 denotes a plurality of (in this example, four) heavy-weight lifting devices that can be extended and contracted installed on the ground, and are arranged in a rectangular corner portion so as to surround the heat storage chamber 1 around the heat storage chamber 1. Yes. The heavy lifting device 2 is connected to each other by an upper beam 3A, a main beam 3B, and a lower beam 3C described later. The heavy lifting device 2 is used as a temporary frame for lifting the heat storage chamber 1 by a jack 5 described later. The A guide member 6 made of a chill tank or the like for guiding the heat storage chamber 1 during lowering is provided on the upper beam 3A for connecting the tops of the heavy lifting device 2 and the lower beam 3C for connecting the lower portions of the heavy lifting device 2. It is attached. The corner portion of the main beam 3B that connects the heavy lifting device 2 between the upper beam 3A and the lower beam 3C is connected by the sub beam 4, and the jack 5 is attached to the sub beam 4 (see FIG. 4). ). The weight lifting device 2 is provided over the entire length of the heat storage chamber 1 by adjusting the height of the top of the weight lifting device 2 so that the height of the upper beam 3A is higher than the center of gravity of the heat storage chamber 1. Even without this, the heat storage chamber 1 can be stably supported. The stable support of the heat storage chamber 1 is further improved by the guide member 6.

  It should be noted that by increasing the capacity of the jack 5, it is possible to dismantle in a state in which built-in materials such as a refractory material and a catalyst are incorporated in the heat storage chamber 1, which was not possible with the heavy machinery method. In particular, the jack method has an advantage that it can be dismantled without giving vibrations, and thus has high safety in operation.

  As the heavy load lifting / lowering device 2, for example, a heavy load lifting / lowering device disclosed in Japanese Patent Laid-Open No. 2009-102972 is used. Hereinafter, the heavy lifting device 2 will be described with reference to the drawings.

  FIG. 5 is a front view showing the heavy article lifting apparatus, and FIG. 6 is a plan view showing the heavy article lifting apparatus.

  As shown in FIG. 5 and FIG. 6, the heavy article lifting device 2 has an outer support 7A, an intermediate support 7B, and an inner support 7C nested, and can be moved up and down by a plurality of outer lifting means 8A and inner lifting means 8B, respectively. The upper beam 3A described above is connected between the tops of the inner support columns 7C.

  The outer elevating / lowering means 8A and the inner elevating / lowering means 8B are formed of, for example, a hydraulic jack device disclosed in Patent Document 2. This hydraulic jack device will be described later.

  The outer lifting / lowering means 8A includes an outer strand 9A stretched between the upper and lower ends of the intermediate column 7B, and an outer jack body 10A fixed to the outer column 7A and extendable and contractable by a hydraulic pump. The outer jack body 10A includes first gripping means (upper wire gripping device 41a described later) provided on the movable side, and second gripping means (lower wire gripping device 41b described later) attached to the fixed side of the outer jack body 10A. When the outer jack body 10A is extended, the first gripping means grips the outer strand 9A, and at the same time, the second gripping means releases the gripping of the outer strand 9A, while the outer jack body 10A At the same time, the first gripping means releases the gripping of the outer strand 9A, and at the same time, the second gripping means grips the outer strand 9A. , The outer column 7A is lifted and lowered intermittently together with the inner column 7C.

  The inner lifting / lowering means 8B includes an inner strand 9B stretched between the upper and lower ends of the inner column 7C, and an inner jack body 10B fixed to the intermediate column 7B and extendable and contracted by a hydraulic pump. The inner jack body 10B includes first gripping means provided on the movable side and second gripping means attached to the fixed side of the inner jack body 10B. When the inner jack body 10B is extended, the first gripping means is: At the same time, the second gripping means releases the grip of the inner strand 9B while the first gripping means releases the grip of the inner strand 9B when the inner jack body 10B is contracted. At the same time, the second gripping means grips the inner strand 9B, and thus the inner strut 7C moves up and down intermittently with respect to the intermediate strut 7B by the expansion and contraction of the inner jack body 10B.

  Thus, the intermediate strut 7B moves up and down together with the inner strut 7C with respect to the outer strut 7A, and the inner strut 7C moves up and down with respect to the intermediate strut 7B. This is smoothly performed by a guide member 11 made of a chill tank or the like attached therebetween.

  An outline of the hydraulic jack device disclosed in Patent Document 2 will be described with reference to the drawings.

  FIG. 8 is a partially omitted sectional view showing the hydraulic jack device.

  As shown in FIG. 8, the hydraulic jack device is configured by an upper wire gripping device 41 a and a lower wire gripping device 41 b that are provided along the strand 40 with a space therebetween in the vertical direction. The upper anchor base plate 42a of the upper wire gripping device 41a is fixed to the piston 45 side of the hydraulic jack 43, and the lower anchor base plate 42b of the lower wire gripping device 41b is fixed to the cylinder 44 side of the hydraulic jack 43. A plurality of hydraulic jacks 43 are installed at symmetrical positions, and each is driven in synchronization by a hydraulic system.

  The upper pressure plate 46a and the upper release plate 47a of the upper wire gripping device 41a are connected by a plurality of connecting rods 49 penetrating the upper anchor block 48a, and move up and down integrally by an upper clamping cylinder 50a described later. Similarly, the lower pressure plate 46b and the lower release plate 47 of the lower wire gripping device 41b are connected by a plurality of connecting rods 49 penetrating the lower anchor block 48b, and are integrally moved up and down by a lower clamping cylinder 50b described later. Move.

  An upper clamping cylinder 50a is fixed to the upper anchor block 48a, and an upper release plate 47a is fixed to the piston 52a side. Therefore, when the upper clamping cylinder 50a is operated, the upper pressure plate 46a and the upper release plate 47a move up and down integrally. Similarly, a lower clamping cylinder 50b is fixed to the lower anchor block 48b, and an upper release plate 47a is fixed to the piston 52b side. Therefore, when the lower clamping cylinder 50b is operated, the lower pressure plate 46b and the lower release plate 47b move up and down integrally.

  By the upper clamping cylinder 50a, the upper pressure plate 46a and the upper release plate 47a are simultaneously moved up and down to forcibly loosen the upper wire grip 51a of the upper wire gripping device 41a with respect to the through hole 53a of the upper anchor block 48a. Or by fitting into the through-hole 53a, that is, by opening and closing, the strand 40 can be grasped or released simultaneously. Similarly, the lower clamping plate 50b simultaneously moves the lower pressure plate 46b and the lower release plate 47b up and down to force the lower wire grip 51b of the lower wire gripping device 41b into the through hole 53b of the lower anchor block 48b. On the other hand, the strand 40 can be grasped or released simultaneously by loosening or fitting into the through hole 53b, that is, by opening and closing.

  If this operation is alternately performed for the upper and lower wire gripping devices 41a and 41b, and the upper wire gripping device 41a holding the strand 40 is lifted and lowered by the hydraulic jack 43, the heavy object 54 connected to the tip of the strand 40 is lifted, Can be hung. That is, the pillars 7B and 7C can be moved up and down.

  The jack 5 is composed of a hydraulic jack device similar to the outer and inner lifting means 8A and 8B, and is stretched between the jack body 12 attached to the sub beam 4 and the jack body 12 and a suspension fitting 13 described later. It consists of a strand 14.

  As shown in FIG. 3, the suspension fitting 13 includes a plurality of (four in this example) arcuate contact plates 15 that are applied to the outer surface of the heat storage chamber 1, and a hydraulic cylinder 16 that tightens the contact plates 15 into a ring shape. It is made up of. The suspension fitting 13 can be firmly fixed to the heat storage chamber 1 by fastening the contact plates 15 with the hydraulic cylinder 16, and thus the heat storage chamber 1 is lifted by the jack 5. By using the hydraulic cylinder 16, the suspension fitting 13 can be fixed to the heat storage chamber 1 easily and reliably.

  Next, a tower-like structure dismantling method according to the present invention will be described with reference to FIG. 7 taking a heat storage chamber as an example of the tower-like structure.

  First, as shown in FIG. 7A, a heavy lifting device 2 is installed around the heat storage chamber 1 (No. 1) to be disassembled, and the upper beam 3A, the main beam 3B, They are connected by the lower beam 3 </ b> C, the guide member 6 and the secondary beam 4 are attached, and the jack 5 is installed on the secondary beam 4. At this time, the height of the heavy lifting device 2 is adjusted so that the upper beam 3 </ b> A of the heavy lifting device 2 is positioned at the center of gravity of the heat storage chamber 1. Next, the hanging metal fitting 13 is temporarily fixed to the lower part of the heat storage chamber 1 (above the block B1), and the hanging metal fitting 13 is fixed to the lower end of the strand 14 of the jack 5. The suspension fitting 13 is finally tightened by the cylinder 16 to fix the suspension fitting 13 to the heat storage chamber 1. The heat storage chamber 1 is suspended by frictional force with the suspension fitting 13, but if the suspension fitting 13 cannot be tightened strongly due to the strength of the heat storage chamber 1, the block 17 is attached to the outer wall of the heat accumulation chamber 1. Welding and fixing the hanging metal fitting 13 through the block 17 (see FIG. 2).

  Next, as shown in FIG. 7B, the block B1 of the heat storage chamber 1 is cut.

  Next, as shown in FIG. 7C, in a state where the heat storage chamber 1 is lifted by the jack 5, the block B1 is pulled out horizontally and removed.

  Next, as shown in FIG. 7D, the heat storage chamber 1 is suspended to the ground by the jack 5.

  Next, as shown in FIG. 7 (E), only the hanging metal fitting 13 is lifted to the upper part from the next block B2 to be cut and fixed to the heat storage chamber 1, and the block B2 is cut and removed as shown in FIG. To do.

  Such an operation is repeated until the head 1A of the heat storage chamber 1 comes directly above the upper beam 3A as shown in FIG. 7 (F).

  When the head 1A of the heat storage chamber 1 comes directly above the upper beam 3A, the head 1A of the heat storage chamber 1 is removed with a crane or the like as shown in FIG. This removal operation can be performed safely and easily because the height of the head 1A is low.

  After removing the head 1A, as shown in FIG. 7 (G), after moving the hanging metal fitting 13 upward, the lower block B3 of the heat storage chamber 1 is cut, and as shown in FIG. 7 (H), Block B3 is removed.

  Next, as shown in FIG. 7 (I), the heat storage chamber 1 is suspended to the ground by the jack 5.

  After repeating such dismantling work and suspending the last block Bn to the ground as shown in FIG. 7 (J), the hanging bracket 13 is removed as shown in FIG. Block Bn is removed.

  As described above, disassembly of the heat storage chamber 1 (No. 1) is completed. When the heat storage chamber 1 is disassembled, the next heat storage chamber 1 (No. 2) to be disassembled is disassembled in the same manner as in the heat storage chamber 1.

  The above is the case where the tower-like structure to be demolished is a heat storage furnace, but it is needless to say that the dismantling method of the present invention can be applied to other tower-like structures.

  As described above, according to the present invention, a temporary frame can be easily constructed by using an extendable heavy lifting device as the temporary frame, and the size of the tower-like structure can be increased. Regardless, since the same heavy lifting device can be used, the temporary frame can be standardized, and the heavy lifting device can be used for dismantling other tower structures. As a result, the cost of dismantling can be reduced.

  In addition, according to the conventional dismantling method, it is necessary to construct a large temporary frame that can cover the entire tower-like structure. However, the construction work of the large temporary frame is a high place work and is dangerous. On the other hand, since the heavy lifting device can be extended and contracted, the construction work of the heavy lifting device can be performed in a lowland and is safe.

  Furthermore, if the height of the heavy lifting device is adjusted so that the center of gravity of the tower structure before dismantling comes to the top of the heavy lifting device, the heavy lifting device is constructed over the entire tower structure. The tower-like structure can be stably supported without any problem. This stable support effect is further improved by attaching the guide member to the heavy lifting device.

1: Heat storage chamber 1A: Head 2: Heavy lifting device 3A: Upper beam 3B: Main beam 3C: Lower beam 4: Sub beam 5: Jack 6: Guide member 7A: Outer column 7B: Intermediate column 7C: Inner column 8A : Outer lifting / lowering means 8B: Inner lifting / lowering means 9A: Outer strand 9B: Inner strand 10A: Outer jack main body 10B: Inner jack main body 11: Guide member 12: Jack main body 13: Hanging bracket 14: Strand 15: Baking plate 16: Hydraulic cylinder 17: Block 31: Furnace 32: Post 33: Base 34: Jack 35: Rail 36: Cart 40 Strand 41a: Upper wire gripping device 41b: Lower wire gripping device 42a: Upper anchor base plate 42b: Lower anchor base plate 43: Hydraulic jack 44: Cylinder 45: Piston 46a: Upper pressure Plate 46b: lower pressure plate 47a: upper release plate 47b: lower release plate 48a: upper anchor block 48b: lower anchor block 49: connecting rod 50a: upper clamping cylinder 50b: lower clamping cylinder 51a: upper wire grip 51b: lower Wire grip 52a: Piston 52b: Piston 53a: Through hole 53b: Through hole 54: Heavy object

Claims (4)

The tower-like structure is dismantled by repeatedly cutting the tower-like structure to be disassembled horizontally and then removing the cut blocks in order from the lower part to the upper part of the tower-like structure. In the demolition method of tower-like structures,
A plurality of telescopic heavy lifting devices are installed as temporary frames around the tower structure, the heavy lifting devices are connected to each other by beams, and a jack is connected to the heavy lifting device via the beams. The tower-like structure is cut at the lower part, and then the tower-like structure above the cut portion is lifted by the jack, then the cut block is removed, and the tower-like structure is then removed by the jack. A method for dismantling a tower-like structure, comprising: hanging an object, then cutting a lower portion of the tower-like structure, and repeatedly removing the cut blocks.   The tower-like structure dismantling method according to claim 1, wherein a guide member is attached to the beam material to guide the tower-like structure when lowered.   The height of the heavy lifting device is adjusted so that the position of the beam connecting between the tops of the heavy lifting device is the position of the center of gravity of the tower-like structure. 2. A method for dismantling a tower-like structure according to 2.   The tower-like structure dismantling method according to any one of claims 1 to 3, wherein the tower-like structure is a heat storage chamber for a hot blast furnace of a blast furnace.

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