JP3745946B2 - Blast furnace blast branch system construction method and construction equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method (including the time of new installation) including an improvement of a blast furnace and an apparatus therefor, and more particularly, a method and a construction for constructing a blower branch pipe system connecting an annular pipe and a tuyere provided around a blast furnace. It relates to a device.
[0002]
[Prior art]
The blast furnace air supply branch system is used under severe conditions because hot air having a high temperature exceeding 1200 ° C. and a pressure of 3.5 kgf / cm ² is passed through each tuyere. It is necessary to suspend the blast furnace and replace each blower branch system due to red heat caused by damage to the refractory on the inner surface or leakage of hot air from between the connecting flanges between the components. In order to cope with the replacement due to these accidents, or for the prior replacement for preventing the accidents, each component of the blower branch system needs to store and manage spare parts as consumable parts. For these spare parts, it is a good measure for facility management and spare part management to share the same size and shape in the air blowing branch system of each tuyere at about 40 locations in a large blast furnace.
For this purpose, in each tuyere, it is an indispensable condition to install with a common dimension from the corresponding lower end flange of the supporting pipe to the sliding part of the tuyeres outside and the blow pipe. . However, while the annular tube is supported by being suspended from the furnace body, the furnace body to which the tuyere is attached is installed on the furnace body foundation, unlike the foundation of the furnace body fence. Therefore, it is difficult to make the annular tube and each tuyere common according to the design dimensions in terms of the manufacturing accuracy and installation accuracy of the members.
[0003]
In order to solve this problem, for example, when installing each support pipe on a newly installed annular pipe that has been installed over the ground, as in the construction of a blast furnace, the reference point of the tuyere (the rubbing part of the tuyere and the blow pipe) Create a dimensional adjustment gauge having the same dimensions as the design dimension between the lower end flange of the support pipe and the tuyere fitting that replaces this, and set the lower end of the gauge at the reference point of the tuyere and design With the gauge fixed in accordance with the figure, keeping the gauge tilted, the upper end of the gauge and the lower flange of the support pipe are brought into contact, and the support pipe is temporarily attached to the annular pipe to complete positioning of the support pipe. To do.
After that, by transferring the gauge to the adjacent tuyere and performing the above-mentioned work sequentially, between each tuyere and the corresponding branch pipe lower end flange, the common dimensions on the drawing are accurately set in each blast branch system. Can keep.
After the main pipe is welded to the annular pipe and firmly fixed and installed, the inner refractory is applied. Then, the tuyere and each blower branch component are attached, and the construction of the blower branch system is completed.
[0004]
If the base pipe has already been fixed to the annular pipe due to refurbishment of the blast furnace, etc., insert the adjustment short pipe between the lower branch flange of the base pipe and the air supply branch pipe, and use the gauge to adjust the short pipe It is possible to make the dimensions of the air supply branch systems common by adjusting the upstream or downstream flange surface of the air.
As described above, it was possible to construct a blower branch pipe system with high accuracy by using a gauge.
[0005]
[Problems to be solved by the invention]
However, in the conventional method for constructing the blast furnace blast branch system, the gauge is long and heavy, so that there is a space between each tuyere together with a scaffold for height adjustment for dimensional adjustment and welding. It took a lot of man-hours to move along the tuyere deck along. For this reason, there are problems in work efficiency and work time, and it is not easy to secure transport means and transport space for safely performing transport and adjustment work at construction sites with many obstacles. there were.
This invention is made | formed in view of this situation, and it aims at providing the construction method and construction apparatus of a blast furnace blast branch system which can reduce a man-hour and can shorten a construction period.
[0006]
[Means for Solving the Problems]
The construction method of the blast furnace blast branch system according to the present invention in accordance with the above object is to use a gauge for adjusting the relative installation position between each branch pipe of the blast furnace and the tuyere corresponding to each branch pipe. In the method of constructing the blast furnace branch pipe system of the blast furnace by adjusting the dimensions, the gauge is placed on a gantry suspended on a guide member provided in the lower part of the annular pipe and moved in the circumferential direction of the furnace body. Each branch pipe is arranged in parallel at predetermined intervals in the furnace body circumferential direction. Therefore, the gauge can be moved in the circumferential direction together with the frame suspended on the guide member provided at the lower part of the annular pipe surrounding the furnace body, so that the number of steps for moving the gauge can be reduced and the construction period can be shortened. Can do. Further, the gantry can be used as a scaffold for working at a high place, and the number of man-hours related to the movement of the scaffold can be reduced.
The apparatus for constructing a blast furnace blast branch system according to the present invention in accordance with the above object is to adjust the relative installation position between each branch pipe of the blast furnace and the tuyere corresponding to each branch pipe of the blast furnace. In an apparatus for constructing a blower branch pipe system, a guide member suspended from and supported by a lower part of an annular pipe, and suspended on the guide member via a travel device, the lower position of the annular pipe is movable in the furnace body circumferential direction. A gantry and a gauge for dimension adjustment supported by the gantry.
[0007]
By comprising in this way, a movement and installation of a gauge can be performed easily.
Here, the gantry is provided with a support portion that rotatably supports at least the upper portion of the gauge, and the support portion is brought into contact with an adjustment position between the support pipe and the tuyere. It is also possible to provide on the annular tube side from the center of gravity of the gauge.
Here, the upper part of the gauge that supports at least the upper part in a rotatable manner means the upper part when the gauge is divided into an upper part and a lower part.
When the gauge is placed on the support part, the gauge tries to stabilize by rotating the center of gravity directly below the support part. Therefore, by providing the support portion on the annular tube side from the center of gravity, the gauge can be supported in a state in which the lower and upper portions of the gauge are separated from the predetermined contact positions for the respective dimension adjustments. The gauge can be easily removed from the contact state, and the contact work after the transfer of the adjustment position of the next adjacent support pipe part becomes easy. It can be performed.
[0008]
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.
As shown in FIGS. 1 and 2, an apparatus 10 for constructing a blast furnace blast branch system according to an embodiment of the present invention is not shown corresponding to each branch pipe 12 of the blast furnace 11 and each branch pipe 12. In the apparatus used when the relative installation position between tuyere is adjusted to construct a blown branch pipe system (not shown), a rail 15 as an example of a guide member suspended and supported at the lower part of the annular pipe 14 and the rail 15 And a gantry 17 that is suspended through a wheel 16 that is an example of a traveling device and that can move in the furnace circumferential direction under the annular tube 14, and a dimensional adjustment gauge 18 that is supported by the gantry 17. Yes. This will be described in detail below.
The rail 15 is made of, for example, I-shaped steel or the like, and is provided along a lower end portion of the annular tube 14 through a support member (not shown) over the entire circumference. In addition, the outer periphery of the blast furnace 11 immediately above the tuyere metal 13 that defines the reference point of the tuyere is provided with H-shaped steel or I-shaped via a plurality of L-shaped support brackets 19 attached at predetermined intervals. A rail 20 made of steel or the like is provided. The rectangular base 17 in plan view is supported so as to be movable through the rails 15 and 20 in the horizontal state between the tuyere metal 13 and the branch pipe 12 corresponding thereto.
[0009]
A plurality of wheels 16 of a gear trolley 21 (manual traveling device) suspended so as to be able to travel on the rail 15 via a height adjustment frame 22 are attached to the upper portion of the gantry 17 on the annular tube 14 side. A plurality of wheels 23 mounted on the rail 20 so as to be able to travel are attached to the lower portion of the gantry 17 on the blast furnace 11 side. The gantry 17 can be moved along the rails 15 and 20 by operating the drive wheels of the gear trolley 21.
Above the center of the gantry 17, a semi-cylindrical support portion 35 for placing the upper portion of the gauge 18 and rotatably supporting it is provided on the top of the gauge support member 24 standing on the gantry 17. Yes. The support portion 35 is positioned so as to be closer to the annular tube 14 than the center of gravity G of the gauge 18 when the gauge 18 is brought into contact with the adjustment position between the support tube 12 and the tuyere. In FIG. 1, the rotation direction is restricted to be counterclockwise with the support portion 35 as a fulcrum.
One end of a wire rope 53 provided with a chain block 25 for suspending the gauge 18 is attached to the end of the gantry 17 on the blast furnace 11 side, and the installation position of the gauge support member 24 is located near the center of the gantry 17. Accordingly, an opening 26 through which the gauge 18 can be inserted is formed in the work deck portion on the top surface of the gantry 17.
[0010]
The gauge 18 includes a plurality of positioning plates 27 that abut on the inner periphery of the tuyere metal 13 serving as a reference point of the tuyere at the tip, a horizontal reference member 28 fitted into the tuyere metal 13, and a support base A support pipe positioning member 30 that abuts a support pipe lower end flange 29 provided at the lower portion of the pipe 12 and a vertical reference member 31 that removably connects the horizontal reference member 28 and the support pipe positioning member 30 are provided. And it is L-shaped as a whole.
The other end of the wire rope 53 having one end attached to the gantry 17 is attached to the lower part of the vertical reference member 31, and the upper part of the support pipe positioning member 30 is connected to the upper part of the annular pipe 14 and the chain block 32. The gauge 18 can be moved up and down by operating the chain blocks 25 and 32, and rough centering can be performed.
[0011]
Below the center of the abutment surface of the support pipe lower end flange 29 of the annular pipe 14 of the support pipe positioning member 30, a mounting part 34 having an arcuate groove formed downward can be mounted on the support part 35. Is provided.
A leveling device 39 is provided above the horizontal reference member 28, and a weight 52 is provided inside the support pipe positioning member 30 and the vertical reference member 31 communicating therewith. The position can be adjusted.
When the gauge 18 is used, the branch pipe positioning member 30 and the vertical reference member 31 and the side portion of the blast furnace 11 are respectively connected by attitude fine adjustment means 50 and 51 having detachable turnbuckles 37 and 38, respectively. Fine adjustment of the installation position can be performed.
When the gauge 18 is installed, the height of the gantry 17 is set so that the upper end portion of the vertical reference member 31 is slightly above the opening 26 of the gantry 17.
An operator can operate the gauge 18 on the tuyere deck 36 and the gantry 17 below the gauge 18, and can operate the gear trolley 21 to move the gantry 17.
[0012]
Then, the construction method using the apparatus 10 for construction of a blast furnace blast branch system will be described. The construction method of the blast furnace blast branch system is that the relative installation position between each branch pipe 12 of the blast furnace 11 and the tuyere corresponding to each branch pipe 12 is adjusted using a gauge 18 to construct the blast furnace branch system. In this method, the gauge 18 is placed on a mount 17 suspended on a rail 15 provided at the lower part of the annular tube 14 and moved in the furnace body circumferential direction.
First, the support pipe 12 to be installed in the opening formed in the annular pipe 14 is temporarily held in the annular pipe 14 by a temporary support (not shown).
The mounting portion 34 of the support pipe positioning member 30 is placed on the support portion 35 of the gantry 17 set on the rails 15 and 20, and the lower portion of the vertical reference member 31 is attached to the gantry 17 by the wire rope 53 provided with the chain block 25. Connecting. At this time, the support pipe positioning member 30 and the vertical reference member 31 of the gauge 18 are supported in a connected state at a position indicated by a two-dot chain line in FIG. 1, and the horizontal reference member 28 of the gauge 18 is a vertical reference member. The connection with 31 is released.
[0013]
Next, the gear trolley 21 is operated from the top of the tuyere deck 36, and the gantry 17 is moved along the rails 15 and 20 to the rear (outer side of the furnace) of the predetermined tuyere metal 13.
Then, the horizontal reference member 28 is fitted into the tuyere metal 13, the positioning plate 27 is brought into contact with the inner periphery of the tuyere metal 13, and the chain blocks 25 and 32 are operated so that the horizontal reference member 28 is moved to the vertical reference member. 31 is connected to the end of 31 and the upper end of the support pipe positioning member 30 is brought into contact with the support pipe 12 from which the temporary support is removed to perform rough centering.
Subsequently, the upper and lower two attachment plates 49 are respectively attached to predetermined positions on the iron shell of the blast furnace 11, and the attitude fine adjustment means 50 provided with turnbuckles 37 and 38 at the two upper and lower portions of the gauge 18 via the attachment plates 49. , 51 is installed. Next, a leveler 39 attached to the horizontal reference member 28 of the gauge 18 and a weight 52 hanging inside the support pipe positioning member 30 and the vertical reference member 31 are used, and the turnbuckles 37 and 38 are adjusted to adjust the vertical. Then, horizontal alignment is performed, and the uniformity of the contact position of the positioning plate 27 is confirmed using a thickness gauge.
[0014]
After the centering is completed, the welded pipe 12, the doubling, and the reinforcing rib are temporarily attached to the annular pipe 14 and then the main welding is performed.
After the welding is completed, the posture fine adjustment means 50 and 51 are removed, the connection between the horizontal reference member 28 and the vertical reference member 31 is released, and the chain blocks 25 and 32 are operated to place the placement portion of the support pipe positioning member 30. 34 is placed on the support portion 35. Since the barycentric point G of the gauge 18 is at a lower position on the blast furnace 11 side with respect to the support portion 35 (lower left in FIG. 1), the support pipe positioning member 30 and the vertical reference member 31 rotate counterclockwise, and the support pipe Since the contact portion of the positioning member 30 and the lower end flange 29 of the support pipe and the connecting portion of the vertical reference member 31 and the horizontal reference member 28 are moved away from each other, the gauge 18 can be easily moved. Can do. Thereafter, the wire rope 54 provided with the chain block 32 is detached, and the gantry 17 is moved in the circumferential direction of the furnace body, thereby moving to the attachment portion of the next support pipe 12.
In this way, the gauge 18 can be moved quickly. It is also possible to move the gauge 18 without disassembly by connecting the horizontal reference member 28 and the vertical reference member 31 so as to be bendable using hinges.
[0015]
Next, an apparatus 40 for constructing a blast furnace blast branch system according to a modification of the present invention will be described with reference to FIGS.
The blast furnace blast branch system construction device 40 uses a gantry 42 in which a part of the gantry 17 of the blast furnace blast branch system construction device 10 is changed, but the other parts have the same structure. The same members as those used in the blast furnace blast branch system construction device 10 are denoted by the same reference numerals, and description thereof is omitted.
Near the center of the opening 43 formed in the work deck at the top of the gantry 42 is formed a reduced width portion 45 on which a part of the periphery of the flange portion 44 formed at the lower end of the support pipe positioning member 30 can be placed. is doing. In addition, a columnar support portion 47 is provided on the upper portion near the center of the gantry 42 so as to extend horizontally over the upper end portions of a pair of gauge support members 46 erected in parallel with the opening 43 interposed therebetween. .
A wire rope 55 provided with a chain block 41 for suspending the vertical reference member 31 is provided at a lower portion near the center of the gantry 42.
[0016]
When the construction device 40 is used, when the gauge 18 is moved, the horizontal reference member 28 and the vertical reference member 31 are connected, and the support pipe positioning member 30 is disconnected from the vertical reference member 31. It is in a state.
The horizontal reference member 28 and the vertical reference member 31 are suspended from the gantry 42 by wire ropes 53 and 55, and the support pipe positioning member 30 is supported on both outer portions of the support portion 47 and the reduced width portion 45. The plate portion 33 is supported from below. In this state, the gantry 42 and the divided gauge 18 can move along the rails 15 and 20.
The gauge 18 is attached and removed by the following procedure.
When the wire rope 54 provided with the chain block 32 is attached to the upper part of the branch pipe positioning member 30 when the branch pipe 12 is constructed, and the branch rope positioning member 30 is pulled upward by operating this, the branch pipe positioning member 30 rotates around the support portion 47, and the flange portion 44 is separated from the upper surface of the gantry 42.
[0017]
In this state, the chain blocks 25 and 41 are operated to move the horizontal reference member 28 and the vertical reference member 31 connected thereto to the blast furnace 11 side, and the upper end flange 48 of the vertical reference member 31 is moved to the support pipe positioning member 30. It is inserted below the flange portion 44. And the upper end flange 48 and the flange part 44 are connected, and the gauge 18 is assembled. Next, the chain blocks 25, 32, and 41 are operated, and the upper end portion of the support pipe positioning member 30 is brought into contact with the support pipe 12 to perform rough centering. Thereafter, the support pipe 12 is welded in the same procedure as in the above embodiment.
Removal of the gauge 18 is performed by an operation procedure reverse to the above-described attachment procedure. Since the center of gravity G of the gauge 18 is on the furnace body side with respect to the support portion 47, the gauge 18 rotates around the support portion 47 to rotate the support pipe positioning member 30, the support pipe lower end flange 29, the horizontal reference member 28, and the blade. Separation of the base 13 can be facilitated.
By configuring in this way, even if the dividing position of the gauge 18 is changed, the gauge 18 can be easily attached, detached, and conveyed, so that the support pipe 12 can be easily constructed.
[0018]
The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment. For example, the gauge positioning plate 27 can be attached to and detached from the gauge body. After the removal, the gauge body can be moved without being divided by rotating the gauge body around the support portions 35 and 47 and moving them away from the blast furnace 11 and the support pipe 12.
Moreover, in the said embodiment, the mounts 17 and 42 were attached and used for the rail 15 provided in the lower part of the annular pipe 14, and the rail 20 provided in the outer periphery of the blast furnace, However, instead of the rails 15 and 20, two pieces are used. A rail may be provided in the annular tube 14, and the mounts 17 and 42 may be movably attached to the annular tube 14 for use. Moreover, as the rail 15, it is economical if the rail for hoists generally installed for the furnace periphery work of the blast furnace 11 is diverted.
Furthermore, the number of chain blocks and turnbuckles used in the present embodiment and the mounting positions can be changed, and the balance between stability and workability can be achieved.
Moreover, although the support part provided in the mount is provided in the support pipe positioning member 30, if it is a radial direction outer side (furnace outer side) from the gravity center position of a gauge, you may support below this, for example, It is also possible to provide the vertical reference member 31.
[0019]
【The invention's effect】
In the construction method of a blast furnace blast branch pipe system according to claim 1, the gauge for dimension adjustment is moved in the circumferential direction of the furnace body together with a frame suspended on a guide member provided at a lower part of an annular pipe surrounding the furnace body. Therefore, it is possible to reduce the man-hours for moving the gauge for adjusting the dimensions and the work deck, shorten the work period, and improve the safety of the work.
4. The apparatus for constructing a blast furnace blast branch pipe system according to claim 2 and 3, wherein the guide member is suspended and supported at a lower position of the annular pipe, and is suspended on the guide member via a traveling device, and the lower part of the annular pipe is disposed in the furnace body. Since it has a gantry movable in the circumferential direction and a gauge supported by the gantry, the gauge can be easily moved and installed.
In particular, in the apparatus for constructing a blast furnace blast branch system according to claim 3, since the gantry is provided with a support portion that rotatably supports at least the upper portion of the gauge, the lower portion and the upper portion of the gauge are respectively attached to the gantry. The gauge can be supported in a state of being separated from the contact position, and the work can be performed quickly with fewer work steps.
[Brief description of the drawings]
FIG. 1 is a sectional view of an apparatus for constructing a blast furnace blast branch system according to an embodiment of the present invention.
FIG. 2 is a plan sectional view of the construction apparatus.
FIG. 3 is a sectional view of an apparatus for constructing a blast furnace blast branch system according to a modification of the present invention.
FIG. 4 is a plan sectional view of the construction apparatus.
[Explanation of symbols]
10: Device for constructing a blast furnace blast branch system, 11: Blast furnace, 12: Branch pipe, 13: Tuyere metal, 14: Ring tube, 15: Rail (guide member), 16: Wheel (travel device), 17: Base, 18: Gauge, 19: Support bracket, 20: Rail, 21: Gear trolley, 22: Height adjustment frame, 23: Wheel, 24: Gauge support member, 25: Chain block, 26: Opening, 27: Positioning plate , 28: horizontal reference member, 29: support pipe lower end flange, 30: support pipe positioning member, 31: vertical reference member, 32: chain block, 33: support plate part, 34: mounting part, 35: support part , 36: tuyere deck, 37, 38: turnbuckle, 39: level, 40: apparatus for constructing a blast furnace blast branch system, 41: chain block, 42: mount, 43: opening, 44: flange, 45 : Shrink Parts, 46: gauge support member, 47: support, 48: upper end flange, 49: mounting plate, 50, 51: position fine adjustment means, 52: weight, 53 to 55: wire rope

Claims (3)

In the method for constructing the blast furnace branch pipe system of the blast furnace by adjusting the dimensions of each branch pipe of the blast furnace and the relative installation position between the tuyere corresponding to each of the branch pipes using a gauge for dimension adjustment,
A method for constructing a blast furnace blast branch system, wherein the gauge is placed on a gantry suspended on a guide member provided at a lower portion of an annular pipe and moved in the circumferential direction of the furnace body. In an apparatus for constructing the blast furnace branch pipe system of the blast furnace by adjusting the size of the relative installation position between each branch pipe of the blast furnace and the tuyere corresponding to each branch pipe,
A guide member suspended from the lower part of the annular tube;
A gantry suspended on the guide member via a traveling device and movable in the furnace body circumferential direction under the annular tube;
An apparatus for constructing a blast furnace blast branch system comprising a dimensional adjustment gauge supported by the gantry. 3. The apparatus for constructing a blast furnace blast branch pipe system according to claim 2, wherein the gantry is provided with a support part that rotatably supports at least an upper part of the gauge, and the support part supports the gauge in the support pipe. An apparatus for constructing a blower branch pipe system, which is located on the annular pipe side from the center of gravity of the gauge when brought into contact with the adjustment position between the tuyere and the tuyere.

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