JP2014020016A - Construction method for towering structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method for a towering structure capable of safely constructing a large towering structure such as a checker chamber for a hot blast stove of a blast furnace in a short period of time at a low cost without using a large crane.SOLUTION: A construction method for a towering structure: constructs a plurality of blocks which are longitudinally segmentalized components (from the lower most block B1 to the upper most block Bn) of a checker chamber 1 to be constructed; installs a plurality of heavy load lifting devices 2, as temporary structures, extendable in a vertical direction around the checker chamber 1 to be constructed; connects the heavy load lifting devices 2 with beams; attaches jacks 5 to the heavy load lifting devices 2 through the beams; lifts up the upper most block Bn of the checker chamber 1 with the jacks 5; piles the block Bn on top of the block Bn-1 which is one block lower than the same; connects the two piled blocks; lifts up the connected blocks Bn and Bn-1 in an integrated manner; piles the connected blocks on top of the block which is further lower than the two blocks; connects the piled blocks; and repeats operation to lift and connect the blocks.

Description

  The present invention is a method for constructing a tower-like structure, in particular, it is possible to construct a large tower-like structure such as a blast furnace hot stove regenerator safely, in a short period of time and at low cost without using a large crane. The present invention relates to a method for constructing a tower-like structure.

  Conventionally, for example, a large crane is used as a method for constructing a blast furnace hot-air stove regenerator (hereinafter simply referred to as a regenerator) as a large tower-like structure having a height of several tens of meters constructed in an ironworks. There are construction methods and jack-up construction methods.

  The large crane construction method is constructed by dividing the heat storage chamber into multiple blocks in the height direction, lifting the second block with a large crane, stacking it on the bottom block, connecting both blocks, The third-stage block is lifted, stacked on the second-stage block, and the operation of connecting both blocks is repeatedly performed to construct the heat storage chamber.

  The jack-up method is constructed by dividing the heat storage chamber into multiple blocks in the height direction, lifting the uppermost block with the jackup device installed in the temporary frame, and one step below the uppermost block. Stack on the block, connect both blocks, then lift the connected uppermost block and the block one step below the uppermost block integrally with a jack-up device, and further stack on the block one step lower, A heat storage chamber is constructed by repeatedly performing an operation of connecting both blocks.

JP 2009-102972 A Japanese Patent No. 2828430

  According to the large crane method and the jack-up method described above, a large tower structure such as a heat storage chamber can be constructed. However, the large crane method has the following problems.

  (A) A large crane having a high lift and capable of lifting a heavy block is required so as to match the height of the tower-like structure to be constructed.

  (B) A large space for installing a large crane is indispensable, and when the installation space cannot be secured, the large crane construction method cannot be adopted.

  (C) Since work at high places is necessary, there is a danger. In addition, a very large scaffold is required.

  On the other hand, the jack-up method has the following problems.

  (A) Since it is necessary to construct the temporary frame for installing the jack-up device in accordance with the height of the tower-like structure, it takes time to construct the tower-like structure and increases the cost.

  (B) Construction of a temporary frame is dangerous because it is a work at a high place.

  (C) The temporary frame on which the jack-up device is installed needs to be redesigned in accordance with the structure to be constructed.

  (D) When the height of the temporary frame is low, the tower-like structure lifted by the jackup device lacks stability.

  Accordingly, an object of the present invention is to provide a tower-like structure capable of constructing a large 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. It is to provide a construction method.

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

  According to the first aspect of the present invention, the tower-like structure to be constructed is constructed by dividing the tower-like structure to be constructed into a plurality of blocks in the height direction, and can be expanded and contracted in the vertical direction around the tower-like structure to be constructed. A plurality of heavy lifting devices are installed as temporary frames, the heavy lifting devices are connected by beams, a jack is attached to the heavy lifting device via the beams, and the tower-like structure is described by the jacks. Lift the top block of the object, stack it on the block one step below the top block, connect both blocks, and then unite the connected top block and the block one step below the top block It is characterized in that a tower-like structure is constructed by repeatedly lifting up, stacking on a block one step below, and repeatedly connecting both blocks.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, a guide member is attached to the beam material to guide the block when it is lifted.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the position of the beam connecting the tops of the heavy load lifting and lowering devices is the center of gravity of the tower-like structure being built. Further, the present invention is characterized in that the height of the heavy lifting device is adjusted.

  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) Since the heavy lifting device that can extend and contract in the vertical direction has a function as a temporary frame, it is not necessary to construct a temporary frame separately. Therefore, the construction period of the tower-like structure can be shortened.

  (B) Since the heavy lifting device extends and contracts in the vertical direction, a large installation space is not required unlike a large crane.

  (C) Since the heavy load lifting apparatus having a function as a temporary frame can be standardized and diverted to the construction of another tower structure, the construction cost of the tower structure can be reduced.

  (D) According to the conventional jack-up method, it is necessary to construct a large temporary frame that is higher than the height of the tower-like structure to be constructed. However, the construction work of the large temporary frame is a work at a high place. So it is dangerous. On the other hand, since the heavy lifting device can be extended and contracted, the construction work of the heavy lifting device having a function as a temporary frame can be performed in a lowland and is safe.

  (E) A tower-like structure to be constructed by adjusting the height of the heavy-lifting device so that the center of gravity of the tower-like structure being constructed is positioned at the top of the heavy-lifting device. Even without providing the entire length of the object, 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 thermal storage chamber (No. 2) already constructed | assembled by the construction method of this invention, and the thermal storage chamber (No. 1) of the state which installed the block 1 of the lowest step. It is a front view which shows the thermal storage chamber (No. 2) of the state which installed the heat storage chamber (No. 2) already constructed | assembled by the construction method of this invention, and the block 1 of the lowest step. 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 block Bn of the uppermost stage of the construction method of a tower-like structure of this invention. It is a front view which shows the process of lifting the block Bn of the construction method of a tower-like structure of this invention. It is a front view which shows the process of installing block Bn-1 one step lower than block Bn below block Bn of the construction method of a tower-like structure of this invention. It is a front view which shows the process of changing the suspension metal fitting of the construction method of a tower-like structure of this invention from block Bn to block Bn-1. It is a front view which shows the process of lifting the connected block Bn and block Bn-1 of the construction method of a tower-like structure of this invention. It is a front view which shows the process of installing block Bn-2 one step lower than block Bn-1 below block Bn-1 of the construction method of a tower-like structure of this invention. It is a front view which shows the process of installing a furnace top part in block Bn of the construction method of a tower-like structure of this invention. It is a front view which shows the process of lifting all the blocks of the upper stage from the lowest block 1 of the construction method of the tower-like structure of this invention. It is a front view which shows the process of installing the block 1 of the construction method of a tower-like structure of this invention. It is a partially omitted sectional view showing a hydraulic jack device.

  One embodiment of the method for constructing a tower-like structure of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing a heat storage chamber (No. 2) that has already been constructed by the construction method of the present invention and a heat storage chamber (No. 1) in a state where the lowest block 1 is installed, and FIG. FIG. 3 is a front view showing a heat storage chamber (No. 2) already constructed by the construction method of the invention and a heat storage chamber (No. 1) in a state where the lowermost block 1 is installed. FIG. 4 is a sectional view taken along line BB in FIG.

  1 to 4, reference numeral 1 denotes a hot blast furnace heat storage chamber (No. 1, No. 2) of two blast furnaces as tower-like structures, which has a cylindrical shape and a height exceeding several tens of meters. have. 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 (four in this example) heavy load lifting / lowering devices installed on the ground and capable of extending and contracting in the vertical direction. The heavy article lifting / lowering device 2 is arranged in a square corner so as to surround the heat storage chamber 1 around the heat storage chamber 1 to be constructed. 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 portions of the main beam 3B connecting the heavy article lifting device 2 between the upper beam 3A and the lower beam 3C are connected by the sub beam 4, and the jack 5 is attached to the sub beam 4 (FIG. 4). The weight lifting device over the entire length of the heat storage chamber 1 is adjusted 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 being constructed. Even if 2 is not provided, 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.

  Note that by increasing the capacity of the jack 5, it is possible to lift a heavy block of the heat storage chamber 1 in a state where built-in materials such as a refractory material and a catalyst are incorporated.

  As the heavy lifting device 2, for example, a heavy lifting device disclosed in Patent Document 1 (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 lifting / lowering means 8A and the inner lifting / lowering means 8B are constituted by, for example, a hydraulic jack device disclosed in Patent Document 2 (Japanese Patent No. 2828430). 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 (see FIG. 6) composed 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 47b 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 being loosened or fitted 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 block of the heat storage chamber 1 by tightening the contact plates 15 with the hydraulic cylinder 16, and thus the block of 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 block of the heat storage chamber 1 easily and reliably.

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

  First, the heat storage chamber to be constructed is divided into a plurality of blocks (from the lowermost block B1 to the uppermost block Bn) in the height direction and constructed in advance.

  Next, as shown in FIG. 7 (A), four heavy lifting devices 2 are installed on the ground around the heat storage chamber 1 (No. 1) to be constructed, and the upper beam is placed between the heavy lifting devices 2. 3A, the main beam 3B, and the lower beam 3C (not shown) are connected, and the guide member 6 (not shown) and the sub beam 4 (not shown) are attached, and the jack 5 is installed on the sub beam 4.

  Next, as shown in the figure, the suspension fitting 13 is temporarily fixed to the uppermost block Bn, and the suspension fitting 13 is fixed to the lower end of the strand 14 of the jack 5. Then, the suspension fitting 13 is finally tightened by the hydraulic cylinder 16 (see FIG. 3), and the suspension fitting 13 is fixed to the heat storage chamber 1. The heat storage chamber 1 is suspended by a frictional force with the suspension fitting 13, but when the suspension fitting 13 cannot be tightened strongly due to the strength of the heat storage chamber 1, the protruding member 17 is formed on the outer wall of the heat accumulation chamber 1. (Refer to FIG. 2) is welded, and the hanging metal fitting 13 is fixed via the protruding member 17.

  Next, as shown in FIG. 7B, the block Bn is lifted by the jack 5.

  Next, as shown in FIG. 7C, a block Bn-1 that is one step below the block Bn is installed below the suspended block Bn.

  Next, as shown in FIG. 7D, the hanging metal fitting is changed from the block Bn to the block Bn-1.

  Next, after connecting the block Bn and the block Bn-1, the connected block Bn and the block Bn-1 are integrally lifted by the jack 5 as shown in FIG.

Next, as shown in FIG. 7F, a block Bn-2 that is one stage lower than the block Bn-1 is installed below the block Bn-1.
Next, as shown in FIG. 7G, after connecting the block Bn-1 and the block Bn-2, the furnace top 1A is installed in the block Bn.

  By repeating the above steps, as shown in FIG. 7H, all the blocks above the lowermost block B1 connected to each other are integrally lifted by the jack 5, and finally, FIG. ) If the lowermost block B1 is installed and both blocks are connected, the construction of the heat storage chamber 1 (No. 1) is completed. Thereafter, the heavy lifting device 2 is removed. As the construction of the heat storage chamber 1 progresses, the center of gravity of the heat storage chamber 1 moves upward. In accordance with this, as shown in FIGS. The upper beam 3A is raised.

  In addition, by adjusting the height of the heavy load lifting / lowering device 2 so that the upper beam 3A of the heavy lifting / lowering device 2 comes to the position of the center of gravity of the thermal storage chamber 1 being built, it extends over the entire length of the heat storage chamber 1 to be built. Even if the heavy lifting device 2 is not provided, the heat storage chamber 1 under construction can be stably supported. This stable support effect is further improved by the guide member 11 attached to the heavy lifting device 2.

  Although the above is a case where the heat storage chamber 1 is constructed, it is needless to say that the construction method of the present invention can be applied even to other tower-like structures.

  As described above, according to the present invention, it is not necessary to separately construct a temporary frame by using a heavy lifting device that can be expanded and contracted in the vertical direction as the temporary frame. The period can be shortened.

  Moreover, since the same heavy lifting device can be used regardless of the size of the tower structure, it is possible to standardize the temporary frame. Further, the heavy lifting device can be used for other tower structures. Therefore, the construction cost can be reduced.

  In addition, according to the conventional jack-up method, it is necessary to construct a large temporary frame that can cover the entire tower-like structure. Accompany. 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 low area, and a large crane with a safe and high lift is not required, thus reducing the cost. be able to.

  Furthermore, if the height of the heavy lifting device is adjusted so that the center of gravity of the tower-like structure being built 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: Thermal storage chamber 1A: Furnace top part 2: Heavy article 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: Protruding member 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 Rate 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)

  A tower-like structure to be constructed is constructed by dividing the tower-like structure into a plurality of blocks in the height direction, and a plurality of heavy lifting devices that can expand and contract in the vertical direction around the tower-like structure to be constructed, Installed as a temporary frame, connected between the heavy lifting devices with beams, attached a jack to the heavy lifting device via the beams, and lifted the uppermost block of the tower-like structure with the jack Stack the blocks one block below the uppermost block, connect the two blocks, and then lift the connected uppermost block and the block one step lower than the uppermost block together. A method for constructing a tower-like structure, wherein the tower-like structure is constructed by repeatedly performing operations of stacking on blocks and connecting both blocks.   The method for constructing a tower-like structure according to claim 1, wherein a guide member is attached to the beam material to guide the block at the time of lifting.   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 under construction. Item 3. The method for constructing a tower structure according to Item 1 or 2.   The method for constructing a tower-like structure 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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