JP4592860B2 - Blast furnace component installation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for installing a blast furnace component, and more particularly to a method for carrying in and installing a member when installing a floor beam and an annular tube.
[0002]
[Prior art]
The laying beam fixed on the foundation concrete of the blast furnace is a structure that supports the furnace body on the upper surface thereof, and is generally made of steel and is circular in plan view.
The laying beam supports the load of the furnace mantel at the peripheral edge via a base ring attached to the lower end of the furnace bottom mantel, and the furnace body via the bottom plate welded to the base ring at the center upper surface. Support the load of bricks and furnace contents. Normally, a large number of cooling pipes are arranged in parallel in the horizontal direction inside the floor beam, and by cooling the cooling pipes with water or air, the bottom brick and the foundation concrete can be cooled to maintain the equipment. .
For the construction method of installing a laying beam and installing it on the blast furnace foundation when a blast furnace is newly installed or renewing a laying beam in renovation, conventionally, the laying beam is divided into 4 to 6 along the direction of the cooling pipe. From the top of the furnace, use an outrigger crane to suspend it in a substantially vertical state, lower it on the foundation, re-suspend it horizontally and set it at a predetermined position on the foundation, and then connect each divided part to the foundation with anchor bolts. It was fixed and installed. The reason for not taking in one piece is that the spread beam is large and there are many interfering objects around the take-in path such as beams and decks of the blast furnace. Here, the blast furnace slag includes the furnace slag of the blast furnace main body, and the furnace top slag that supports the charging device and the like on the upper part thereof.
[0003]
In addition, even in the method of taking the spread beam from the casting floor side instead of the top of the furnace, it has been divided and taken in without being incorporated into the casting floor as a whole due to limitations of the casting floor building. Also in this case, in order to carry it into the blast furnace pit, it is necessary to hang it horizontally due to the restriction of the interference, and when it is lowered vertically thereafter, the casting bed or the operation floor interfered. In order to hang it on the foundation, many of these interfering objects were removed and rehabilitated after being taken in. In order to shorten the construction period, a tuyere safety ceiling was provided at the operating floor level, and the method of paralleling the upper and lower work was generally performed. The work was opened and then rebuilt and closed, and the upper work during that time was also stopped for safety.
On the other hand, in the work of installing the annular pipe, conventionally, the divided annular pipe divided into 6 to 8 in the circumferential direction is transported on the casting bed using a casting bed crane, and then laterally pulled and carried into the blast furnace furnace. After being set on a floor and / or a stand provided on the operation floor, they were welded together, lifted using a lifting device, and suspended and supported on a blast furnace pit.
[0004]
[Problems to be solved by the invention]
However, since the conventional method of installing the spread beam requires either the furnace top portion or the cast floor side to take in the split beam and re-hanging for alignment, It took a number of days to connect the divided parts, which caused the construction period to be extended. Moreover, the construction period was further extended by the temporary removal of the tuyere safety ceiling accompanying the installation of the floor beam and the suspension of the upper work during that time.
On the other hand, in the conventional method of installing the annular pipe, the inside of the blast furnace pit is out of the service range of the cast iron crane. It was difficult to accurately install the upper surface of the temporary frame, and it was impossible to make an integral connection with high accuracy. Also, workability on a narrow frame was poor.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for installing a blast furnace constituent member that can reduce the man-hours for incorporating the blast furnace constituent member, shorten the construction period, and increase the economy.
[0005]
[Means for Solving the Problems]
A method for installing a blast furnace constituent member according to the first invention that meets the above-mentioned object is a method for installing a blast furnace constituent member comprising a spread beam when a blast furnace is newly installed or repaired, and includes the following steps.
(1) A horizontal receiving beam is erected from the outside of the blast furnace pit to the inside below the annular pipe and above the cast floor surface.
(2) A carriage capable of traveling along the horizontal receiving beam is provided, the laying beam is suspended from the trolley, and a tuyere safety ceiling is placed and fixed on the trolley. The beam and the tuyere safety ceiling are carried into the blast furnace pit.
(3) The suspension support wire rope attached to the laying beam is passed through an insertion hole previously formed in the tuyere safety ceiling and attached to the suspending means provided on the blast furnace pit, and then the laying beam and The connection with the carriage is released, and the laying beam is lowered from the carriage onto the furnace body foundation by using the suspension means.
Here, the horizontal receiving beam in (1) is erected in accordance with the level of the upper surface of the horizontal receiving beam.
In addition, the loading in (2) includes a case where the floor beam is carried in as a single unit, and a case where the floor beam is divided and carried in .
With this configuration, the floor beam can be easily installed in a short time.
[0006]
A method for installing a blast furnace constituent member according to a second aspect of the present invention that meets the above-mentioned object is a method for installing a blast furnace constituent member comprising an annular tube when a blast furnace is newly installed or refurbished, and includes the following steps.
(1) A horizontal receiving beam is erected from the outside of the blast furnace pit to the inside below the annular pipe and above the cast floor surface.
(2) A cart that can travel along the horizontal receiving beam is arranged, an extension deck is provided around the tuyere safety ceiling provided on the cart in the blast furnace pit, and a center of the tuyere safety ceiling is provided. We build working deck by installing a plurality of parallel rails toward the periphery from the part.
(3) The split annular pipe suspended from the central portion of the work deck by the suspension means provided on the blast furnace pit is transferred to the peripheral portion of the work deck using the parallel rail and arranged in an annular shape. , on the working deck, constructing the annular tube in a ring shape by connecting the divided annular tube.
(4) installing said annular tube with upper rack by using the pre-tough Ri means.
Here, the hanging Ri means, and Tsu支from above to lift, for example, can be used on the center hole jack and cranes device.
With this configuration, the work deck is movably provided, so that the work deck can be assembled quickly, and the work area for attaching the annular tube can be expanded to perform the work accurately and quickly. .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
1 and 2 show a state of a blast furnace 10 in which a floor beam 27 which is an example of a blast furnace constituent member is installed by the method of installing a blast furnace constituent member according to an embodiment of the first invention.
The blast furnace 10 is in a state where an existing furnace body (not shown) is dismantled and removed at the time of repair. Further, a horizontal receiving beam 13 is provided at the level of the cast floor surface 14 of the cast floor 16 supported by a large number of cast floor support columns 12 adjacent to the blast furnace rod 11 and penetrates from the outside of the blast furnace rod 11 to the inside. The two are supported by the temporary mount 15 and installed in parallel. Rails 17 are provided on the upper portions of the horizontal receiving beams 13 on both sides. In addition, a plurality of carriages 19 and 20 that can travel along the horizontal receiving beam 13 are placed on the rails 17 on both sides.
The carriages 19 and 20 are configured by connecting two parallel transverse members orthogonal to the horizontal receiving beam 13, and are placed on the rails 17 through wheels provided at both ends of each transverse member. The carriage 20 is provided with a surface on which a member to be transported is placed lower than the carriage 19.
[0008]
A portion of the horizontal receiving beam 13 in the blast furnace pit 11 is an outrigger crane 21 which is an example of a suspension means provided on the upper portion of the blast furnace pit 11 with a blast furnace constituent member carried into the blast furnace hoe 11 by carriages 19 and 20. It becomes the suspension part 22 handed over. Moreover, a first assembly site 23 capable of assembling a blast furnace component to be carried into the blast furnace furnace 11 is provided in a horizontal trapezoidal portion sandwiched between the horizontal receiving beams 13 on the casting floor 16. A second assembly site 24 and a third assembly site 25 are provided in this order on the horizontal receiving beam 13 outside the first assembly site 23 (in the direction opposite to the blast furnace 11).
In the first assembly site 23, a spread beam 27 installed on the furnace body foundation 26 is assembled substantially integrally. The laying beam 27 is configured by connecting ring-shaped I-shaped steels provided in duplicate on the outer periphery with linear I-shaped steels arranged vertically and horizontally. Since the first assembly site 23 is provided on the cast floor 16 and the upper surface is a horizontal plane, the floor beam 27 can be assembled with high accuracy and efficiency. A tuyere safety ceiling 30 is placed on the upper portion of the carriage 19 located directly above the floor beam 27 so that the interior of the blast furnace pit 11 can be divided up and down, and various operations can be performed in the upper and lower portions.
Divided furnace mantels 28 and 29 placed on the floor beam 27 are placed on the second and third assembly sites 24 and 25, respectively. Reference numeral 35 denotes a support pillar of the blast furnace 11.
[0009]
Next, each step of the installation method of the spread beam 27 will be described.
(First step)
Two horizontal receiving beams 13 are installed in parallel on the cast floor surface 14 so as to penetrate from the outside of the blast furnace iron 11 to the inside. On the horizontal receiving beam 13, rails 17 are laid.
(Second step)
The floor beam 27 is assembled at the first assembly site 23. Then, the carriage 19 is arranged on the rail 17 and moved to a position directly above the spread beam 27, and the spread beam 27 is suspended from the carriage 19.
Next, the tuyere safety ceiling 30 is placed and fixed on the carriage 19 using lifting means such as a crawler crane (not shown). The tuyere safety ceiling 30 can also be assembled on the carriage 19.
Then, the floor beam 27 and the tuyere safety ceiling 30 are carried into the blast furnace 11 by the carriage 19.
[0010]
(Third step)
The suspension support wire rope 33 attached to a predetermined position of the floor beam 27 is attached to a suspension balance 31 provided in the suspension support portion of the outrigger crane 21 through an insertion hole formed in the tuyere safety ceiling 30 in advance. Then, the connection between the laying beam 27 and the carriage 19 is released, and using the outrigger crane 21, the laying beam 27 is lowered from the carriage 19 onto the furnace body base 26 and firmly installed using an anchor.
By comprising in this way, the installation beam 27 can be attached quickly and a construction period can be shortened.
Thereafter, after the heat resistant castable and the stamp material are applied to the floor beam 27, the bottom plate is divided and carried and mounted on the floor beam 27. In addition, other work can be performed in parallel on the tuyere safety ceiling 30 by closing the insertion hole of the tuyere safety ceiling 30 during construction of the spread beam 27 and related members. Furthermore, since the tuyere safety ceiling 30 is installed on the carriage 19, when the tuyere safety ceiling 30 is no longer needed or when it is temporarily retracted, the blast furnace culvert is quickly moved along the horizontal receiving beam 13. 11 can be pulled out and the interruption of construction can be suppressed in a short time.
In the installation of the blast furnace 10, there is a step of carrying the furnace body mantels 28 and 29 into the blast furnace furnace 11 and installing them, but the furnace body mantels 28 and 29 are placed on the horizontal receiving beam 13 in the same manner as the floor beam 27. By carrying the carts 20 and 19 into the blast furnace furnace 11, the construction period can be further shortened and the economy can be improved.
[0011]
Next, a case where the annular pipe 34 as an example of the blast furnace constituent member is installed by the method of installing the blast furnace constituent member according to the embodiment of the second invention will be described with reference to FIGS.
In addition, in the installation method of the annular tube 34 according to the present embodiment, the members used in the above-described installation method of the spread beam are used, but the same members as those already described are denoted by the same reference numerals and described. Is omitted.
There is a tuyere 19 disposed in the blast furnace pit 11 via a rail 17 laid on the upper part of the horizontal receiving beam 13 installed below the annular pipe 34 and above the cast floor surface 14. A safety ceiling 30 is provided.
The tuyere safety ceiling 30 provided on the carriage 19 is a substantially square member in plan view surrounded by the four support pillars 35 of the blast furnace 11. On the other hand, the outer shape of the annular tube 34 surrounding the furnace body of the blast furnace 10 in plan view is larger than the outer shape of the tuyere safety ceiling 30. Therefore, an expansion deck 36 having a size that can accommodate the outer shape of the annular tube 34 is provided on each of the four sides around the tuyere safety ceiling 30 to widen the work area.
[0012]
On the upper part of the tuyere safety ceiling 30 provided with the expansion deck 36, a plurality of, for example, seven sets of parallel rails 37 from the central part of the tuyere safety ceiling 30 toward the periphery are installed at predetermined positions to construct a work deck 38. is doing. An annular tube transfer carriage 43 is provided on each set of parallel rails 37 so as to be movable along the parallel rails 37. Each annular tube transfer carriage 43 is mounted with a divided annular tube 39 obtained by dividing the annular tube 34 into seven parts. Further, a center hole jack 44, which is an example of a suspension device capable of moving up and down the annular pipe 34, is provided on each of the horizontal beams connecting the support pillars 35 slightly above the installation position of the annular pipe 34 of the blast furnace 11. ing. An overhang deck 40 is provided near the center of the blast furnace pit 11 in the height direction, a rail 45 is laid from the overhang deck 40 through the inside of the blast furnace pit 11, and blast furnace components are loaded onto the blast furnace. A movable carriage 41 that can be conveyed into and out of the basket 11 is disposed.
[0013]
Next, each process of the installation method of the annular pipe 34 is demonstrated.
(First step)
On the casting floor surface 14, a horizontal receiving beam 13 is installed so as to penetrate from the outside of the blast furnace 11 to the inside. Since this step is the same as the first step of the installation method of the spread beam 27 described above, detailed description thereof is omitted.
(Second step)
A cart 19 that can travel along the rail 17 on the horizontal receiving beam 13 is arranged, and a work deck 38 is provided on the top of the cart 19.
Installation of the work deck 38 is performed by first placing the tuyere safety ceiling 30 outside the blast furnace pit 11 on the carriage 19 or assembling it on the trolley 19 and then carrying it into the blast furnace pit 11 and expanding it inside the blast furnace pit 11. The deck 36 and the parallel rail 37 are assembled and performed.
[0014]
(Third step)
After the assembly of the work deck 38, the divided annular pipe 39 is hooked on the suspension support portion 42 of the crawler crane and placed on the movable carriage 41 on the overhanging deck 40. Next, the movable carriage 41 is moved into the blast furnace furnace 11, and the divided annular pipe 39 is suspended from the outrigger crane 21. Next, the movable carriage 41 is retracted out of the blast furnace furnace 11, and the divided annular pipe 39 is suspended from the center of the work deck 38. Subsequently, the divided annular pipe 39 is received by the annular pipe transfer carriage 43 that has been waiting at the center of the work deck 38 and is pulled along the parallel rail 37 by a lateral pulling means such as a winch (not shown), and the peripheral edge of the work deck 38 is received. To the department. The other divided annular pipes 39 are also placed on the respective annular pipe transfer carriages 43 in the same procedure, transferred to the peripheral edge of the work deck 38, and arranged annularly.
Then, on the work deck 38, the divided annular pipe 39 carried in is welded and connected, and the annular pipe 34 is constructed in a ring shape.
[0015]
(4th process)
Using the center hole jack 44, the annular tube 34 is overlaid and installed at a predetermined height.
In this way, by constructing the work deck 38 on the carriage 19, the work area for constructing the annular pipe 34 can be widened on the same horizontal plane, and the work can be performed quickly.
Further, since the tuyere safety ceiling 30 is used as a part of the work deck 38, other work, for example, installation of the spread beam 27 described in the embodiment of the first invention is performed in parallel below the work deck 38. be able to.
[0016]
When the work deck 38 is removed, the parallel rail 37 and the expansion deck 36 can be disassembled and the carriage 19 can be transported along the rail 17 to the outside of the blast furnace furnace 11, so that each process in the installation of the blast furnace 10 can be performed. Switching can be performed quickly and the overall construction period can be shortened.
It should be noted that each divided annular tube 39 and other blast furnace components used in the blast furnace pit 11, for example, a water header of a stave cooler (not shown) or the like is provided on the carriage 19 or the tuyere safety ceiling 30 provided on the carriage 19. It is also possible to place and carry in, and to mount on the blast furnace 11.
As mentioned above, although embodiment which concerns on this invention has been described, this invention is not limited to the said embodiment, For example, the installation height of the upper surface of the horizontal receiving beam 13 is lower than an annular pipe, And what is necessary is just in the range of the level above a casting floor surface. By installing in this range, installation of the spread beam 27 and the annular tube 34 can be performed in parallel.
Further, in the case of performing partial modification of the annular tube, the connection of the expansion deck 36 can be partially or entirely omitted. Further, FIG. 3 shows a state in which the existing annular pipe has already been dismantled and removed. However, the center hole jack 44 and the work deck 38 are used for dismantling, removal, and carry-out work, so that the installation work is almost the same as the installation work. It is also possible to carry out easily by the reverse operation. The number of divisions of the annular pipe 34 is seven, but this can be divided into, for example, 4 to 10 divisions.
Furthermore, in this embodiment, the trolleys 19 and 20 for carrying the blast furnace components into the blast furnace pit 11 are completely independent carts, but a rolling device such as a chill tank is directly attached to the floor beam (blast furnace component). It is also within the scope of the claims to use a mechanism in which a plurality of s.
Further, in the present embodiment, the construction method at the time of repairing the blast furnace has been described, but the present invention can naturally be applied even when a new blast furnace is installed.
[0017]
【The invention's effect】
In the method of installing the blast furnace constituent member according to claim 1, since the floor beam is carried into the blast furnace pit by means of a carriage, the floor beam can be assembled in a substantially integrated manner with a small number of divisions in advance. Can be shortened.
Further, in the method of installing the blast furnace component according to claim 2, since the work deck is provided at the upper part of the carriage, the work deck can be assembled quickly, and the work area for attaching the annular tube can be expanded. It can be done accurately and quickly.
Furthermore, in the method for installing the blast furnace constituent member according to claim 1 and the method for installing the blast furnace constituent member according to claim 2, the carts used respectively are used together as carts for bringing the mantle mantel into the furnace shell. As a result, the above effects and economic effects are improved.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a state during construction of a blast furnace to which a floor beam installation method according to an embodiment of the present invention is applied.
FIG. 2 is a plan sectional view showing a state during construction of a blast furnace to which the installation method of the same beam is applied.
FIG. 3 is a side sectional view showing a state during construction of a blast furnace to which an annular pipe installation method according to an embodiment of the second invention of the present invention is applied.
FIG. 4 is a plan view of a work deck used in the method for installing the annular pipe.
[Explanation of symbols]
10: Blast furnace, 11: Blast furnace slag, 12: Cast floor support column, 13: Horizontal receiving beam, 14: Cast floor surface, 15: Temporary mount, 16: Cast floor, 17: Rail, 19, 20: Dolly, 21: Outrigger crane (suspension means), 22: rehanging part, 23: first assembly site, 24: second assembly site, 25: third assembly site, 26: furnace body foundation, 27: floor beam (blast furnace configuration) Members), 28, 29: furnace body mantel, 30: tuyere safety ceiling, 31: suspension balance, 33: wire rope for suspension support, 34: annular tube (blast furnace component), 35: support column, 36: expansion deck , 37: parallel rail, 38: work deck, 39: split annular pipe, 40: overhang deck, 41: moving carriage, 42: suspension support, 43: annular pipe transfer carriage, 44: center hole jack (hanging device), 45 :rail

Claims (2)

A method of installing a blast furnace constituent member comprising the following steps in a method of installing a blast furnace constituent member comprising a spread beam at the time of newly installing or renovating a blast furnace.
(1) A horizontal receiving beam is erected from the outside of the blast furnace pit to the inside below the annular pipe and above the cast floor surface.
(2) A carriage capable of traveling along the horizontal receiving beam is provided, the laying beam is suspended from the trolley, and a tuyere safety ceiling is placed and fixed on the trolley. The beam and the tuyere safety ceiling are carried into the blast furnace pit.
(3) The suspension support wire rope attached to the laying beam is passed through an insertion hole previously formed in the tuyere safety ceiling and attached to the suspending means provided on the blast furnace pit, and then the laying beam and The connection with the carriage is released, and the laying beam is lowered from the carriage onto the furnace body foundation by using the suspension means. A method of installing a blast furnace constituent member comprising the following steps in a method of installing a blast furnace constituent member formed of an annular pipe at the time of newly installing or refurbishing a blast furnace.
(1) A horizontal receiving beam is erected from the outside of the blast furnace pit to the inside below the annular pipe and above the cast floor surface.
(2) A cart that can travel along the horizontal receiving beam is arranged, an extension deck is provided around the tuyere safety ceiling provided on the cart in the blast furnace pit, and a center of the tuyere safety ceiling is provided. We build working deck by installing a plurality of parallel rails toward the periphery from the part.
(3) The split annular pipe suspended from the central portion of the work deck by the suspension means provided on the blast furnace pit is transferred to the peripheral portion of the work deck using the parallel rail and arranged in an annular shape. , on the working deck, constructing the annular tube in a ring shape by connecting the divided annular tube.
(4) installing said annular tube with upper rack by using the pre-tough Ri means.

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