CN114674154B - Maintenance method for hot blast stove - Google Patents
Maintenance method for hot blast stove Download PDFInfo
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- CN114674154B CN114674154B CN202210300572.6A CN202210300572A CN114674154B CN 114674154 B CN114674154 B CN 114674154B CN 202210300572 A CN202210300572 A CN 202210300572A CN 114674154 B CN114674154 B CN 114674154B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000012423 maintenance Methods 0.000 title claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000010276 construction Methods 0.000 abstract description 6
- 230000005484 gravity Effects 0.000 abstract description 5
- 239000011449 brick Substances 0.000 description 15
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000009413 insulation Methods 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 2
- 241001669679 Eleotris Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention belongs to the technical field of blast furnace maintenance, and discloses a maintenance method for a hot blast stove, which comprises the following steps: s100, building bearing platforms connected to two sides of the hot blast stove at positions higher than positions to be repaired in the hot blast stove; s200, erecting force transfer beams connected to two sides of the hot blast stove above the bearing platform; s300, maintaining a position to be repaired; s400, dismantling the force transfer beam and the bearing platform. The bearing platform is used as an operation platform for erecting the force transfer beam and is also used as a safety ceiling for maintaining the position to be repaired, and even if the structure above the hot blast stove collapses, the bearing platform can also protect the safety of operators below. The force transmission beam conducts force to the structure of the hot blast stove above the bearing platform, further conducts the load which is originally acted near the position to be repaired to the structure of the hot blast stove far away from the position to be repaired, and the position to be repaired is hardly involved in bearing the gravity of the structure above the position to be repaired. The hot blast stove above the position to be repaired has stable structure, does not need to be dismantled, saves maintenance cost, reduces construction period and has good safety.
Description
Technical Field
The invention relates to the technical field of blast furnace maintenance, in particular to a maintenance method for a hot blast stove.
Background
Because of the special structure of the hot blast stove body, the hot blast outlet belongs to the part of the hot blast stove body which is most easily damaged. When the hot blast stove is damaged, the hot blast outlet is often required to be maintained.
When the hot air outlet is maintained by the traditional maintenance method, refractory bricks above the hot air outlet and surrounding areas of the hot air outlet need to be removed first, and then new refractory bricks are built in situ.
However, because the hot air outlet position is lower in the hot air furnace body structure, no matter what type of hot air furnace, the operation space is small, the number of operators capable of participating in the operation is limited, the maintenance period is as long as 10-15 days, and the workload of the operators is large. Particularly, the siliceous refractory bricks above the hot air outlet have poor adhesion with slurry, and are easy to collapse in the dismantling operation, thereby increasing the workload, improving the danger coefficient of the whole dismantling operation and easily generating personal injury accidents.
Disclosure of Invention
The invention aims to provide a maintenance method for a hot blast stove, which is convenient for maintaining a hot blast outlet, and has the advantages of high safety coefficient, small workload and short maintenance period.
To achieve the purpose, the invention adopts the following technical scheme:
a method of servicing a hot blast stove, comprising:
s100, building bearing platforms connected to two sides of the hot blast stove in the hot blast stove above the position to be repaired;
s200, erecting force transfer beams connected to two sides of the hot blast stove above the bearing platform;
s300, maintaining a position to be repaired;
s400, dismantling the force transfer beam and the bearing platform.
Optionally, the step of building the load-bearing platform in step S100 includes:
s101, erecting a plurality of bearing cross beams in the hot blast stove higher than a position to be repaired;
s102, paving protection plates on each bearing beam.
Optionally, before step S101, the method further includes:
s103, accounting the weight of the hot blast stove above the bearing beam to obtain a load value to be borne;
s104, designing a bearing cross beam according to the load value to be borne.
Optionally, the step of designing the load beam in step S104 includes:
s105, obtaining a length value of the bearing cross beam according to the radial distance of the hot blast stove;
s106, selecting the model of the bearing cross beam from the monorail crane beam selection table according to the length value and the load value to be borne.
Optionally, in step S200, a plurality of transfer beams are erected along the height direction of the stove.
Optionally, erecting the transfer beam in step S200 includes:
s201, dividing the hot blast stove above the bearing platform into a plurality of sections, and accounting the weight of each section of hot blast stove to obtain a sectional load value corresponding to each section of hot blast stove;
s202, selecting corresponding force transfer beams according to the sectional load values, so that each sectional load value is smaller than the rated load value of the corresponding force transfer beam.
Optionally, after step S202, the method further includes:
s203, observing a load indicator of the force transmission beam to obtain a force transmission load value;
s204, according to the force transmission load value, the levelness and the direction of the force transmission beam are adjusted to be larger than the sectional load value and smaller than the rated load value.
Optionally, the two ends of the force transfer beam are respectively provided with a support plate, and each support plate is pressed against the inner wall of the hot blast stove.
Optionally, the lateral dimensions, longitudinal dimensions and area of the support plate are designed based on the diameter of the hot blast air outlet of the stove and the circumferential area of the inner wall of the stove.
Optionally, the following steps are performed simultaneously with the step S200: one end of the safety rope is arranged at a position higher than the force transfer beam, and the other end of the safety rope is connected with the force transfer beam.
The beneficial effects are that:
according to the maintenance method for the hot blast stove, the bearing platform is built above the position to be repaired, and can be used as an operation platform for erecting the force transfer beam and also can be used as a safety ceiling for maintaining the position to be repaired, and even if the structure above the hot blast stove collapses, the safety of operators below the hot blast stove can be protected, so that maintenance work can be normally carried out. And a force transfer beam is also erected above the bearing platform and conducts force to the structure of the hot blast stove above the bearing platform, so that the load originally acted near the position to be repaired is further conducted to the structure of the hot blast stove far away from the position to be repaired, and the position to be repaired is hardly involved in bearing the gravity of the structure above the position to be repaired. Therefore, the worker maintains the position to be repaired below the bearing platform, the hot blast stove above the position to be repaired is stable in structure, the disassembly is not needed, the maintenance cost is saved, the construction period is reduced, and the safety is good.
Drawings
FIG. 1 is a flow chart of a method for repairing a hot blast stove according to an embodiment of the present invention;
fig. 2 is a flow chart of another maintenance method for a hot blast stove according to a first embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
Example 1
The embodiment provides a maintenance method for a hot blast stove, as shown in fig. 1, comprising the following specific steps:
s100, building bearing platforms connected to two sides of the hot blast stove in the hot blast stove above the position to be repaired. The bearing platform is built above the position to be repaired, so that the structure of the hot blast stove above the position to be repaired is transversely reinforced, and the stability of the structure of the hot blast stove is improved. The bearing platform can be used as an operation platform for erecting the force transfer beam and also can be used as a safety ceiling for maintaining the position to be repaired, and even if the structure above the hot blast stove collapses, the protection plate can also protect the safety of operators below the hot blast stove, so that the maintenance work can be normally carried out. In this embodiment, the bearing platform is horizontally erected in the hot blast stove, and the bearing platform supports and connects the circumference of the stove wall of the hot blast stove in the direction of the plane of the bearing platform, so that the bearing capacity is strong, and the bearing platform is not easy to be pressed and deformed in the force transmission process.
And S200, erecting force transfer beams connected to two sides of the hot blast stove above the bearing platform. The load of the original directly acting on the position to be repaired is transmitted to the hot blast stove structure far away from the position to be repaired by the force transmission beam, the transmitted gravity acts on other areas except the periphery of the position to be repaired, the structure at the position to be repaired does not participate in bearing the gravity of the hot blast stove structure above the structure to be repaired, the stability of the hot blast stove structure above the structure to be repaired is greatly improved no matter how the structure at the position to be repaired is damaged, and the collapse possibility of the hot blast stove is greatly reduced. Therefore, the staff can conveniently and directly maintain the position to be repaired under the condition of not dismantling the structure of the hot blast stove above the position to be repaired.
S300, maintaining the position to be repaired. In this embodiment, the position to be repaired is a hot air outlet. In other embodiments, the location to be repaired may be other structures in the middle or lower part of the hot blast stove, such as an in-stove heat insulation wall. The load is hardly carried above the position to be repaired by the protection of the bearing platform and the force transfer beam, and the stress of the structure above the position to be repaired is not changed drastically and collapse occurs when the position to be repaired is maintained.
Optionally, as shown in fig. 2, maintaining the to-be-repaired location in step S300 includes:
s301, embedding wedge-shaped pieces between old bricks at positions to be repaired, and removing the old bricks according to the masonry staggered joints between the old bricks. In the embodiment, the hot air outlet is built by refractory bricks, the wedge-shaped piece is a wooden wedge, and the wooden wedge is embedded between old refractory bricks at the periphery of the hot air outlet, so that the structure of the hot air outlet in the dismantling process can be always kept stable, and the construction safety is improved.
S302, replacing a new brick. That is, new refractory bricks are re-laid on the periphery of the hot air outlet to effect maintenance of the hot air outlet.
S400, dismantling the force transfer beam and the bearing platform. After the maintenance of the hot air outlet is completed, the force transfer beam and the bearing platform are removed, so that the weight of the structure above the position to be repaired is redistributed, the integral structural mechanical characteristics of the hot air furnace are restored to the state before the maintenance, and the long-term reliability of the hot air furnace structure is realized. In this embodiment, in order to ensure the safety of the dismantling process, the dismantling is performed according to a bottom-up dismantling method, and the load-bearing platform is dismantled first, and then the force transfer beam is dismantled.
According to the maintenance method for the hot blast stove, provided by the embodiment, in the maintenance operation process of the to-be-repaired position below the bearing platform, the gravity of the hot blast stove structure above the to-be-repaired position is not acted on the to-be-repaired position, and the whole hot blast stove structure above the to-be-repaired position is not required to be dismantled during maintenance of the to-be-repaired position, so that the maintenance cost is saved, the construction period is reduced, and the safety is good.
Optionally, as shown in fig. 2, the step of building the bearing platform in step S100 includes:
s101, erecting a plurality of bearing cross beams in the hot blast stove higher than the position to be repaired. In this embodiment, each load beam is a steel beam, such as, for example, i-steel.
S102, paving protection plates on each bearing beam. In this embodiment, the protection plate is a steel plate. The protection plate can be used as an operation platform for erecting the force transfer beam and also can be used as a safety ceiling for maintaining the hot air outlet, and even if the structure above the hot air furnace collapses, the protection plate can also protect the safety of operators below the hot air furnace, so that the maintenance work can be normally carried out.
In the embodiment, the upper end of the heat insulation wall body is slightly higher than the hot air outlet, the two ends of each I-steel are lapped on the upper end of the heat insulation wall body, and the steel plates are paved and connected on each I-steel. In one embodiment, the protection plate is connected with each bearing beam in a binding way, so that the protection plate is convenient to disassemble and assemble, and the construction efficiency is improved. In another embodiment, the protection plate and the bearing beam are welded into an integrated structure, so that the structure is high in strength and bearing capacity, and the protection plate and the bearing beam cannot be loosened, so that operators below the protection plate are prevented from being hurt.
In the embodiment, the bearing platform formed by constructing the bearing cross beam and the protection plate has the advantages of simple structure, strong bearing capacity and difficult deformation and damage in the force transmission and supporting process. In other embodiments, a scaffold can be erected below the hot air outlet, a protection plate is paved on the scaffold, and the scaffold is supported by the bottom surface of the hot air furnace, so that the scaffold is stable in support and high in safety.
Optionally, before step S101, the method further includes:
s103, accounting the weight of the hot blast stove above the bearing cross beam, and obtaining a load value to be borne. In this example, the upper end of the hot air outlet had 160 layers of bricks, each layer had 30 bricks, and the individual bricks weighed 4.8kg, and the total weight of the bricks was about 23.04 tons, and after containing slurry, about 24 tons. In order to increase the reliability of the load beam, the load value to be borne should be 24 tons multiplied by a safety factor greater than 1. In this embodiment, the safety factor is recommended to be 1.1 to 1.20. If the safety factor is 1.1, the load value to be borne is 26.4 tons. That is, a load of about 26.4 tons at the upper end of the hot air outlet mainly acts on the load-bearing cross beam, thereby greatly reducing the load directly borne by the structure near the hot air outlet.
S104, designing a bearing cross beam according to the load value to be borne. Optionally, the step of designing the load beam includes:
s105, obtaining the length value of the bearing cross beam according to the radial distance of the hot blast stove. In this embodiment, the maximum distance between the heat insulation walls is 2.8m, and in order to make the two ends of the load beam stably overlap the heat insulation walls, the length of the load beam needs to be greater than 2.8m. The length of the load beam is, for example, 3m.
S106, selecting the model of the bearing cross beam from the monorail crane beam selection table according to the length value and the load value to be borne. In the embodiment, the length value of the bearing beam is 3m, the load to be borne is 26.4 tons, the type of the I-steel selected from the monorail crane beam selection table is 45a, and the I-steel of the type can bear the load of 26.7 tons, so that the bearing requirement is met.
Optionally, in step S200, a plurality of transfer beams are erected along the height direction of the stove. In order to enable the transfer beam to transfer the load above the hot air outlet to other furnace walls of the hot air furnace body above the hot air outlet in a known manner, and avoid damage to the hot air furnace body caused by excessive load transfer, the number of the transfer beams, the erection angles and the erection height difference can be adaptively adjusted.
Specifically, erecting the transfer beam in step S200 includes:
s201, dividing the hot blast stove above the bearing platform into a plurality of sections, and calculating the weight of each section of hot blast stove to obtain a sectional load value corresponding to each section of hot blast stove. That is, the load above the hot air outlet is transferred to other furnace walls layer by layer, so that the control is easy, the force transfer process is stable, and the safety is good.
S202, selecting corresponding force transfer beams according to the sectional load values, so that each sectional load value is smaller than the rated load value of the corresponding force transfer beam. In the embodiment, the force transfer beam is a jack rod, and the operation is convenient and the bearing capacity is strong.
After step S202, the method further comprises:
s203, observing a load indicator of the jack rod to obtain a force transmission load value. In this embodiment, the jack rod is provided with a load indicator for displaying the load actually born by the jack rod and the force transmission load value, so that a worker can observe and adjust the erection of the jack rod in time in the erection process.
S204, according to the force transmission load value, the levelness and the direction of the jack rod are adjusted to be larger than the sectional load value and smaller than the rated load value. That is, according to the stress condition of the jack rod, the levelness and the direction in the hot blast stove are adjusted, so that the jack rod can not only transmit the load above the hot blast outlet to other stove walls, but also can not bend or damage the hot blast stove wall on the pressure-bearing side due to overlarge bearing load.
In the embodiment, the upper part of the protection plate is divided into three sections from bottom to top, and each section is provided with a force transfer beam. The hot blast stove above each force transfer beam is carried by the force transfer beam, and transmits the load generated by the structure above the hot blast outlet to the hot blast stove body far away from the upper part of the hot blast outlet, after three force transmission, the load above the hot blast outlet acts on the hot blast stove body far away from the hot blast outlet layer by layer, the periphery of the hot blast outlet does not bear the load generated by the structure of the hot blast stove above the hot blast outlet, and when the hot blast outlet is maintained, the hot blast outlet and the structure above the hot blast outlet are stable, and collapse or sliding cannot occur due to the dismantling of the hot blast outlet.
In this embodiment, when the transfer beam is erected, the transfer beam is horizontally placed and its length is adjusted so that both ends thereof are pressed against the inner wall of the hot blast stove to fix the position thereof, and the load of the furnace wall at one end of the transfer beam acts on the furnace wall connected to the other end thereof through the transfer beam. The load above the hot air outlet can be applied to the furnace wall far away from the position where the hot air outlet is positioned in a layer-by-layer progressive manner by increasing the number of the force transfer beams layer by layer.
Optionally, the two ends of the force transfer beam are respectively provided with a support plate, and each support plate is pressed against the inner wall of the hot blast stove. The supporting plate can increase the contact area between the force transmission beam and the inner wall of the hot blast stove, and further the supporting force provided by the force transmission beam is uniformly distributed at each position of the inner wall of the hot blast stove, so that the load transmitted above the hot blast outlet is uniformly distributed on the stove wall far away from one side of the hot blast outlet. In this embodiment, the support plate is preferably a sleeper, which has a high coefficient of friction with the bricks in the furnace wall, to ensure that the transfer beam remains fixed at the mounting location in the stove, avoiding deflection of the load during transfer.
Optionally, the lateral dimensions, longitudinal dimensions and area of the support plate are designed based on the diameter of the hot blast air outlet of the stove and the circumferential area of the inner wall of the stove. In this embodiment, the area of the support plate is proportional to the diameter of the hot air outlet, e.g. 0.1-0.2 times, which is proportional to the circumferential area of the inner wall of the stove. When the diameter of the supporting plate relative to the hot air outlet is too small, a large-area non-contact area exists between the supporting plate and the two side furnace walls of the hot air furnace, the connecting range of the supporting plate and the two side furnace walls of the hot air furnace is small, the load transmission is concentrated, the generated pressure is strong, and the hot air furnace walls are easily damaged. When the diameter of the support plate is overlarge relative to the hot air outlet, the single support plate is connected with the inner wall of the hot air furnace with a large area, the load generated by the structure above the hot air outlet cannot be transmitted in a segmented mode, the force transmission direction of the load generated by the hot air furnace structure with different heights cannot be adjusted, the load transmission direction is offset too much, the transverse decomposition of the load above the hot air outlet cannot be easily realized, and the stability of the hot air furnace structure above the hot air outlet is poor when the hot air outlet is maintained.
Example two
The maintenance method for the hot blast stove provided in this embodiment is basically the same as that in the first embodiment, and the main difference is that, while step S200 is performed, the following steps are further performed: one end of the safety rope is arranged at a position higher than the force transfer beam, and the other end of the safety rope is connected with the force transfer beam. The safety rope can prevent the force transmission Liang Yiwai from falling off, thereby protecting the safety of operators. In this embodiment, an i-beam is erected at the upper end of the hot blast stove, and three safety ropes are connected to the upper end of the i-beam, and the lower ends of the three safety ropes are respectively connected to the three force transfer beams, so as to improve the safety of the construction process.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. A method of servicing a hot blast stove, comprising:
s100, building bearing platforms connected to two sides of the hot blast stove in the hot blast stove above the position to be repaired;
s200, erecting force transfer beams connected to two sides of the hot blast stove above the bearing platform;
s300, maintaining a position to be repaired;
s400, dismantling the force transfer beam and the bearing platform;
the bearing platform is used as an operation platform for erecting the force transfer beam and a safety ceiling for maintaining a to-be-repaired position, and supports and connects the circumference of the furnace wall of the hot blast stove in the direction of the plane of the bearing platform.
2. A method of repairing a hot blast stove according to claim 1, wherein the step of building a load-bearing platform in step S100 comprises:
s101, erecting a plurality of bearing cross beams in the hot blast stove higher than a position to be repaired;
s102, paving protection plates on each bearing beam.
3. The method for maintaining a hot blast stove according to claim 2, characterized in that it further comprises, before step S101:
s103, accounting the weight of the hot blast stove above the bearing beam to obtain a load value to be borne;
s104, designing a bearing cross beam according to the load value to be borne.
4. A method of repairing a hot blast stove according to claim 3, wherein the step of designing the load beam in step S104 comprises:
s105, obtaining a length value of the bearing cross beam according to the radial distance of the hot blast stove;
s106, selecting the model of the bearing cross beam according to the length value and the load value to be borne.
5. A method of maintenance for a stove according to claim 1, wherein in step S200 the transfer beam is erected in a plurality along the height of the stove.
6. The method of maintenance for a hot blast stove according to claim 5, wherein erecting the transfer beam in step S200 comprises:
s201, dividing the hot blast stove above the bearing platform into a plurality of sections, and accounting the weight of each section of hot blast stove to obtain a sectional load value corresponding to each section of hot blast stove;
s202, selecting corresponding force transfer beams according to the sectional load values, so that each sectional load value is smaller than the rated load value of the corresponding force transfer beam.
7. The method of maintenance for a hot blast stove according to claim 6, further comprising, after step S202:
s203, observing a load indicator of the force transmission beam to obtain a force transmission load value;
s204, erecting and adjusting the levelness and the direction of the force transfer beam according to the force transfer load value, so that the force transfer load value is larger than the sectional load value and smaller than the rated load value.
8. A method of maintenance for a stove according to any one of claims 1 to 7, wherein the transfer beam is provided with support plates at both ends, each support plate being pressed against the stove inner wall.
9. A method of maintenance for a stove according to claim 8, characterized in that the lateral dimensions, longitudinal dimensions and area of the support plate are designed based on the diameter of the stove's hot air outlet and the circumferential area of the stove's inner wall.
10. A method of repairing a hot blast stove according to any of claims 1 to 7, characterized in that, while step S200 is performed, the following steps are performed: one end of the safety rope is arranged at a position higher than the force transfer beam, and the other end of the safety rope is connected with the force transfer beam.
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| CN1618991A (en) * | 2004-11-12 | 2005-05-25 | 马鞍山钢铁股份有限公司 | Exchange technology of hot air furnace hot air short pipe |
| CN105369002A (en) * | 2015-12-09 | 2016-03-02 | 天津钢铁集团有限公司 | Repair tooling of hot-blast branch pipe lining of hot-blast furnace and repair method thereof |
| CN205258515U (en) * | 2015-12-09 | 2016-05-25 | 天津钢铁集团有限公司 | Frock is repaired to hot -blast furnace hot -blast branch pipe inside lining |
| CN206091355U (en) * | 2016-07-01 | 2017-04-12 | 北京中冶设备研究设计总院有限公司 | Post structure is taken out to concrete plant's pillars of a house |
| CN107806020A (en) * | 2017-11-18 | 2018-03-16 | 曾小真 | A kind of overhead job platform of bridge construction |
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