CN109576427B - Method for removing residual iron of drilling type blast furnace - Google Patents
Method for removing residual iron of drilling type blast furnace Download PDFInfo
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- CN109576427B CN109576427B CN201910073713.3A CN201910073713A CN109576427B CN 109576427 B CN109576427 B CN 109576427B CN 201910073713 A CN201910073713 A CN 201910073713A CN 109576427 B CN109576427 B CN 109576427B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to the technical field of removing residual iron at the bottom of a blast furnace during overhaul of the blast furnace in the metallurgical industry, in particular to a drilling type blast furnace residual iron removing method, which comprises the following steps: in a blast furnace, continuously drilling residual iron decomposition holes downwards along the upper surface of a residual iron block, wherein a plurality of residual iron decomposition holes are drilled to form a ring shape or a plurality of residual iron decomposition holes and the outer edge of the residual iron block form a ring shape together, and the residual iron decomposition holes penetrate through the residual iron block from top to bottom; the separated decomposed iron pieces are transported out of the blast furnace. According to the scheme of the invention, through a continuous drilling residual iron removing mode, the operation environment of constructors is greatly improved, the working safety is greatly improved, the construction is simple, the number of auxiliary tools is small, the method is particularly suitable for removing the residual iron in a local small range, the cost can be saved, and the construction period can be shortened.
Description
Technical Field
The invention relates to the technical field of removal of residual iron at the bottom of a blast furnace during overhaul of the blast furnace in the metallurgical industry, in particular to a drilling type blast furnace residual iron removing method.
Background
The removal of the residual iron condensed at the bottom of the blast furnace is an important link of blast furnace overhaul, and directly influences the production efficiency of enterprises. And (4) discharging residual molten iron when the blast furnace is stopped, wherein the residual molten iron is not completely discharged, and the rest part is condensed at the bottom of the blast furnace to form a bottom-shaped residual iron block.
At present, the following method is generally adopted for removing the residual iron during the blast furnace overhaul: firstly, in the blasting removal method, most of molten iron in a furnace is discharged, then, after the molten iron which cannot be discharged is condensed into iron blocks, explosives are added into blasting holes of the iron blocks, a large number of protective measures are required to be prepared for improving the blasting safety, the use cost is high, the danger is high, the drilling and blasting of the blasting holes are required to be carried out for multiple times, the time cost is too high, and the working efficiency is low; secondly, the flame cutting method is used for cutting and taking out the residual iron blocks through a gunpowder cutter, so that the working efficiency is low, the working environment is extremely severe, and the manual working strength is high; thirdly, the mechanical crushing method is used for mechanically crushing the residual iron through mechanical devices such as a gravity hammer, a jack and the like, so that the working efficiency is low, the labor intensity is high, and the expected effect on the area needing to be dismantled cannot be guaranteed; fourthly, the rope saw cutting method has high requirements on construction technology, the phenomena of rope breaking and rope clamping are easy to occur in the rope saw cutting process, and the construction difficulty is high.
Disclosure of Invention
Therefore, a drilling type blast furnace residual iron dismantling method needs to be provided to solve the problems of severe working environment, high danger degree, low working efficiency and high time and fund use cost of blast furnace residual iron dismantling in the prior art.
In order to achieve the purpose, the inventor provides a method for removing residual iron of a drilling type blast furnace, which comprises the following steps:
in a blast furnace, continuously drilling residual iron decomposition holes downwards along the upper surface of a residual iron block, wherein a plurality of residual iron decomposition holes are drilled to form a ring shape or a plurality of residual iron decomposition holes and the outer edge of the residual iron block form a ring shape together, and the residual iron decomposition holes penetrate through the residual iron block from top to bottom;
the separated decomposed iron pieces are transported out of the blast furnace.
Further, the side walls of the adjacent residual iron decomposition holes are mutually communicated or tangent, so that the decomposed iron blocks in the annular area formed by the residual iron decomposition holes are separated or the decomposed iron blocks in the annular area formed by the residual iron decomposition holes and the outer edge of the residual iron block are separated.
Furthermore, a preset distance is reserved between adjacent residual iron decomposition holes, an expansion separation device is inserted into the drilled residual iron decomposition holes, the joints between the adjacent residual iron decomposition holes are disconnected through the expansion splitting force of the expansion separation device, and the decomposed iron blocks are separated on the whole residual iron blocks.
Further, the expansion separation device is a splitter, and a splitting gun of the splitter is inserted into the drilled residual iron decomposition hole.
And further, drilling a residual iron decomposition hole by using a drill bit, wherein the residual iron decomposition hole penetrates through the residual iron block until the residual iron decomposition hole is contacted with the refractory material at the bottom of the furnace.
Furthermore, at least two positions on the upper surface of the residual iron block are drilled with residual iron decomposition holes simultaneously, and the drilled residual iron decomposition holes are made to form a ring shape or the residual iron decomposition holes and the outer edge of the residual iron block form a ring shape together.
Further, the "transporting the separated decomposed iron pieces out of the blast furnace" specifically includes: the decomposed iron blocks are hoisted to the trailer in the blast furnace through the hoisting device, and the decomposed iron blocks are conveyed out of the blast furnace through the trailer.
Furthermore, slide rails are arranged inside the blast furnace, the slide rails are arranged from the opening on the furnace shell to the residual iron block, and the trailer can be arranged on the slide rails in a sliding manner.
In order to solve the problems, the inventor also provides another method for dismantling the residual iron of the drill hole type blast furnace, which comprises the following steps:
and (3) longitudinal drilling and cutting: in a blast furnace, continuously and vertically drilling residual iron decomposition holes with a preset depth downwards along the upper surface of a residual iron block, wherein the side walls of adjacent residual iron decomposition holes are mutually communicated or tangent, and a plurality of vertical residual iron decomposition holes form a longitudinal cutting groove;
and (3) transverse drilling and cutting: the horizontal residual iron decomposition holes are continuously formed inwards along the outer surface of the side wall of the residual iron block, the side walls of adjacent residual iron decomposition holes are mutually communicated or tangent to each other, a plurality of horizontal residual iron decomposition holes form a transverse cutting groove, and the transverse cutting groove is communicated with the longitudinal cutting groove;
removing residual iron: the separated decomposed iron pieces are transported out of the blast furnace.
In order to solve the problems, the inventor also provides another method for dismantling the residual iron of the drill hole type blast furnace, which comprises the following steps:
and (3) longitudinal drilling and cutting: in a blast furnace, continuously and vertically drilling residual iron decomposition holes with a preset depth downwards along the upper surface of a residual iron block, wherein the side walls of adjacent residual iron decomposition holes are mutually communicated or tangent, and a plurality of vertical residual iron decomposition holes form a longitudinal cutting groove;
breaking the residual iron by external force: breaking off the residual iron at the longitudinal cutting groove by external force until the bottom of the residual iron cut by the longitudinal drilling is completely broken;
removing residual iron: the separated decomposed iron pieces are transported out of the blast furnace.
Be different from prior art, above-mentioned technical scheme a drilling formula blast furnace residual iron demolishs method, through the mode of boring in the blast furnace along residual iron piece upper surface downwards in succession and establish residual iron decomposition hole for residual iron decomposition hole runs through whole residual iron piece, bores and establishes a plurality of residual iron decomposition holes that accomplish and enclose into the annular or a plurality of residual iron decomposition holes and residual iron piece outward flange enclose into the annular jointly, finally makes partial residual iron piece separation in the annular region form solitary decomposition iron piece wholly, will decompose the iron piece and transport out the blast furnace finally. Through the residual iron removal mode of continuous drilling, constructor operation environment improves greatly, and the work safety promotes by a wide margin, and the construction is simple moreover, and auxiliary fixtures are few, are particularly useful for the residual iron removal of local minizone, can save cost and reduction of erection time.
Drawings
FIG. 1 is a construction schematic view of a method for demolishing residual iron of a continuous drill hole type blast furnace according to an embodiment;
FIG. 2 is one of the schematic diagrams of the layout of the residual iron decomposing holes in the method for demolishing residual iron of a continuous drilled-hole blast furnace according to the embodiment;
FIG. 3 is a second schematic view showing the arrangement of the residual iron decomposing holes in the method for continuously drilling the blast furnace residual iron removal according to the embodiment.
Description of reference numerals:
100. a furnace shell;
200. residual iron blocks;
300. a drill bit;
400. residual iron decomposition holes;
500. decomposing the iron blocks;
600. a hoisting device;
700. a trailer;
800. a reel winding mechanism;
900. and pulling a rope.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 to 3, the present embodiment discloses a method for removing residual iron from a drill-hole type blast furnace, including the following steps:
in a blast furnace, continuously drilling residual iron decomposition holes 400 downwards along the upper surface of a residual iron block 200, wherein a plurality of residual iron decomposition holes 400 are drilled to form a ring shape or a plurality of residual iron decomposition holes 400 and the outer edge of the residual iron block 200 form a ring shape together, and the residual iron decomposition holes 400 penetrate through the residual iron block 200 from top to bottom; in practical use, a constructor needs to select a proper drilling tool according to construction operation requirements, and the hardness of the drill bit 300 is ensured to be high enough to perform drilling work on the solidified residual iron block 200. Specifically, a constructor aligns the drill bit 300 to the upper surface of the residual iron, starts the drilling tool, moves the drill bit 300 downwards along the upper surface of the residual iron, preferably adds cooling water into the hole while drilling, cools and cools the drill bit 300 to prolong the service life of the drilling tool until the residual iron decomposition hole 400 drilled by the drill bit 300 penetrates through the residual iron block 200, completes the first drilling of the residual iron decomposition hole 400, then takes out the drill bit 300 to connect to drill other residual iron decomposition holes 400, and makes the drilled residual iron decomposition holes 400 surrounded, so that the small decomposed iron block 500 in the annular area separates the whole residual iron block 200, and the dismantling mode is that dismantling is performed by the inside of the residual iron, and the construction difficulty is relatively high; or a plurality of residual iron decomposition holes 400 and the outer edge of the residual iron block 200 jointly form an annular shape, the residual iron block 200 is removed from the edge of the whole furnace bottom, the number of drilled holes is relatively small, the working difficulty is greatly reduced, the method is suitable for local removal of residual iron, a constructor can remove the furnace shell 100 or the refractory material in a pre-removal area firstly, and the removal efficiency is high.
In some preferred embodiments, before drilling the residual iron decomposition hole 400, a constructor can mark a hole on the upper surface of the residual iron, mark a specific position of an annular hole and/or arrange a plurality of connecting paths of the residual iron decomposition holes 400, so that when the hole is drilled, the target is more definite, the working precision is higher, and the drilling efficiency of the residual iron decomposition holes 400 is further improved, so that the decomposition efficiency of the residual iron is improved.
Finally, the separated decomposed iron pieces 500 are transferred out of the blast furnace.
Compared with a flame cutting mode, the method has the advantages that the residual iron removing mode of continuous drilling is adopted, so that the operation environment of constructors is greatly improved; for the mode of gunpowder blasting, the work safety promotes by a wide margin, and the efficiency is demolishd to the residual iron promotes greatly, for broken and the rope saw cutting of machinery, the construction is more simple, and the auxiliary fixtures that use are few, have reduced use cost's input by a wide margin to and auxiliary fixtures' installation time, more importantly, because the instrument that the mode of drilling demolishs used is few, easy operation is reliable, makes it be particularly useful for the residual iron demolishs of local minizone, can save cost and reduction of erection time greatly.
Further, in this embodiment, two methods for separating the residual iron in the area surrounded by the residual iron decomposition hole 400 are disclosed. As shown in fig. 2, the first is to ensure that the side walls of the adjacent residual iron decomposition holes 400 are communicated with each other or tangent to each other when drilling is performed, so that the adjacent two residual iron decomposition holes 400 are completely cut off from the large residual iron block 200 in the furnace bottom, and thus after the drilling is completed, the decomposed iron blocks 500 in the annular region surrounded by the residual iron decomposition holes 400 are separated or the decomposed iron blocks 500 in the annular region surrounded by the residual iron decomposition holes 400 and the outer edges of the residual iron block 200 are separated. As shown in fig. 3, the second method is to reserve a predetermined distance between the adjacent residual iron decomposition holes 400, insert an expansion separation device into the drilled residual iron decomposition holes 400, and break the connection between the adjacent residual iron decomposition holes 400 by the expansion separation force of the expansion separation device, so that the decomposed iron block 500 is separated from the entire residual iron block 200. The arrangement mode of the first residual iron decomposing hole 400 does not need to introduce an expansion separation device, so that the equipment cost investment is low, but the number of drilled holes is relatively large; and the second arrangement mode of the residual iron decomposition holes 400 can further reduce the arrangement number of the residual iron decomposition holes 400, the expansion splitting force of the expansion separation device breaks the connection part between the adjacent residual iron decomposition holes 400, the decomposition iron block 500 is separated on the whole residual iron block 200, and the residual iron dismantling efficiency is further improved.
In a specific embodiment, the expansion-separation device is a splitter (not shown), and a splitting gun of the splitter is inserted into the drilled residual iron resolving hole 400. The splitter is a novel splitting and crushing device, and ultrahigh pressure oil output by a pump station drives an oil cylinder to generate huge driving force, and the split object can be split according to a preset direction after being mechanically amplified, so that the splitting device replaces blasting and manpower crushing. The splitting gun of the splitter is inserted into the residual iron decomposition hole 400, and the joint of the adjacent residual iron decomposition holes 400 is broken by using a splitting pushing force, so that the decomposed iron block 500 is peeled off from the whole residual iron block 200. In practical use, the preset distance between two adjacent residual iron decomposition holes 400 and the specification of the selected splitter need to be strictly calculated and then selected, so that the splitter can split the joints between the residual iron decomposition holes 400.
In some specific embodiments, in order to further improve the residual iron removing efficiency, because the construction tools are simple, the constructor can use multiple sets of drilling tools to simultaneously drill the residual iron decomposition holes 400 at least two positions on the upper surface of the residual iron block 200, and make the drilled residual iron decomposition holes 400 form a ring shape or make the residual iron decomposition holes 400 and the outer edge of the residual iron block 200 form a ring shape together. The simultaneous drilling of the plurality of residual iron decomposition holes 400 undoubtedly saves a lot of drilling time, that is, if 50 residual iron decomposition holes 400 need to be drilled, if 5 drill bits 300 are used to drill simultaneously, the drilling can be completed within 10 drilling time.
In a further embodiment shown in fig. 1, the "transporting the separated decomposed iron pieces 500 out of the blast furnace" is specifically: the decomposed iron blocks 500 are hoisted to a trailer 700 in the blast furnace by a hoisting device 600 (only a hook portion is shown in the drawing), and the decomposed iron blocks 500 are transported out of the blast furnace by the trailer 700. The disassembled iron block 500 is bound by a lifting rope, a steel cable and other tools, and then is lifted by a lifting device 600 to a trailer 700, and then is transported to the opening of the furnace shell 100 to be taken out of the skull. In a specific embodiment, slide rails are arranged inside the blast furnace, the slide rails are arranged from an opening on the furnace shell 100 to the residual iron blocks, the trailer 700 is slidably mounted on the slide rails, the slide rails are arranged to facilitate movement of the trailer 700, and the reel winding mechanism 800 retracts the pull rope 900 to move the trailer 700, so that time and labor are saved.
The embodiment also provides another method for removing residual iron of the drilling type blast furnace, which comprises the following steps:
and (3) longitudinal drilling and cutting: in a blast furnace, continuously and vertically drilling residual iron decomposition holes with a preset depth downwards along the upper surface of a residual iron block, wherein the side walls of adjacent residual iron decomposition holes are mutually communicated or tangent, and a plurality of vertical residual iron decomposition holes form a longitudinal cutting groove;
and (3) transverse drilling and cutting: the horizontal residual iron decomposition holes are continuously formed inwards along the outer surface of the side wall of the residual iron block, the side walls of adjacent residual iron decomposition holes are mutually communicated or tangent to each other, a plurality of horizontal residual iron decomposition holes form a transverse cutting groove, and the transverse cutting groove is communicated with the longitudinal cutting groove;
removing residual iron: transporting the separated decomposed iron blocks out of the blast furnace;
and repeating the steps of longitudinal drilling and cutting, transverse drilling and cutting and residual iron removing until the residual iron in the blast furnace is completely removed.
In this embodiment, through the layering drilling cutting method who carries out continuous drilling respectively on vertically and horizontal, not only the construction is simple, and auxiliary fixtures is few, and work efficiency is high, adopts layering drilling and incomplete indisputable to demolish moreover, has alleviateed the load of drill bit greatly, further reduces the work degree of difficulty, is favorable to promoting the life of drill bit.
The embodiment also provides another method for removing residual iron of the drilling type blast furnace, which comprises the following steps:
and (3) longitudinal drilling and cutting: in a blast furnace, continuously and vertically drilling residual iron decomposition holes with a preset depth downwards along the upper surface of a residual iron block, wherein the side walls of adjacent residual iron decomposition holes are mutually communicated or tangent, and a plurality of vertical residual iron decomposition holes form a longitudinal cutting groove;
breaking the residual iron by external force: breaking off the residual iron at the longitudinal cutting groove by external force until the bottom of the residual iron cut by the longitudinal drilling is completely broken; specifically, a thin-sheet jack can be placed in the longitudinal cutting groove; starting the thin-sheet jack, and applying a horizontal thrust to the residual iron by the thin-sheet jack; until the bottom of the residual iron which is vertically cut is broken, the cutting in the longitudinal direction is realized;
removing residual iron: transporting the separated decomposed iron blocks out of the blast furnace;
and repeating the steps of longitudinal drilling and cutting, breaking off the residual iron by external force and removing the residual iron until the residual iron in the blast furnace is completely removed.
In this embodiment, break disconnected cooperation mode off with the fingers and thumb through continuous drilling and external force, two kinds of cooperation mode operations are all comparatively simple, and auxiliary fixtures are few, and work efficiency is high, and two kinds of mode cooperation work is more nimble moreover, and same mode also adopts the incomplete iron layering to demolish, has alleviateed the load of drill bit greatly, further reduces the work degree of difficulty, is favorable to promoting the life of drill bit.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present patent.
Claims (6)
1. A method for removing residual iron of a drilling type blast furnace is characterized by comprising the following steps:
in a blast furnace, continuously drilling residual iron decomposition holes downwards along the upper surface of a residual iron block, wherein the drilled residual iron decomposition holes and the outer edge of the residual iron block jointly form a ring shape, and the residual iron decomposition holes penetrate through the residual iron block from top to bottom; the side walls of the adjacent residual iron decomposition holes are mutually communicated, and the residual iron decomposition holes are sequentially communicated so that the residual iron decomposition holes are separated from the decomposed iron blocks in an annular area defined by the outer edges of the residual iron blocks;
drilling a residual iron decomposition hole by using a drill bit, wherein the residual iron decomposition hole penetrates through the residual iron block until the residual iron block is contacted with a refractory material at the bottom of the furnace;
the separated decomposed iron pieces are transported out of the blast furnace.
2. The method according to claim 1, wherein the drilling of the residual iron decomposing holes is performed simultaneously at least two locations on the upper surface of the residual iron block, and the drilled residual iron decomposing holes are made to form a ring shape or the residual iron decomposing holes and the outer edge of the residual iron block together form a ring shape.
3. The method for removing residual iron from a drill hole type blast furnace according to claim 1, wherein the "transferring the separated decomposed iron pieces out of the blast furnace" is specifically: the decomposed iron blocks are hoisted to the trailer in the blast furnace through the hoisting device, and the decomposed iron blocks are conveyed out of the blast furnace through the trailer.
4. The method according to claim 3, wherein a slide rail is disposed inside the blast furnace, the slide rail is disposed from an opening on the furnace shell to the residual iron block, and the trailer is slidably mounted on the slide rail.
5. A method for removing residual iron of a drilling type blast furnace is characterized by comprising the following steps:
and (3) longitudinal drilling and cutting: in a blast furnace, continuously and vertically drilling residual iron decomposition holes with preset depth downwards along the upper surface of a residual iron block, wherein the side walls of adjacent residual iron decomposition holes are mutually communicated, and a plurality of vertical residual iron decomposition holes form a longitudinal cutting groove;
and (3) transverse drilling and cutting: the horizontal residual iron decomposition holes are continuously formed inwards along the outer surface of the side wall of the residual iron block, the side walls of adjacent residual iron decomposition holes are communicated with each other, a plurality of horizontal residual iron decomposition holes form a transverse cutting groove, and the transverse cutting groove is communicated with the longitudinal cutting groove;
removing residual iron: transporting the separated decomposed iron blocks out of the blast furnace;
and repeating the steps of longitudinal drilling and cutting, transverse drilling and cutting and residual iron removing until the residual iron in the blast furnace is completely removed.
6. A method for removing residual iron of a drilling type blast furnace is characterized by comprising the following steps:
and (3) longitudinal drilling and cutting: in a blast furnace, continuously and vertically drilling residual iron decomposition holes with preset depth downwards along the upper surface of a residual iron block, wherein the side walls of adjacent residual iron decomposition holes are mutually communicated, and a plurality of vertical residual iron decomposition holes form a longitudinal cutting groove;
breaking the residual iron by external force: breaking off the residual iron at the longitudinal cutting groove by external force until the bottom of the residual iron cut by the longitudinal drilling is completely broken; the method comprises the following steps: placing a thin-sheet jack in the longitudinal cutting groove; starting the thin-sheet jack, and applying a horizontal thrust to the residual iron by the thin-sheet jack; until the bottom of the residual iron below the longitudinal cutting groove is broken, realizing longitudinal cutting;
removing residual iron: transporting the separated decomposed iron blocks out of the blast furnace;
and repeating the steps of longitudinal drilling and cutting, breaking off the residual iron by external force and removing the residual iron until the residual iron in the blast furnace is completely removed.
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| CN201910073713.3A CN109576427B (en) | 2019-01-25 | 2019-01-25 | Method for removing residual iron of drilling type blast furnace |
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| CN1097237A (en) * | 1993-06-23 | 1995-01-11 | 曲来印 | The splitting method and the splitter thereof that are used for exploitation of stone |
| CN103088171A (en) * | 2011-10-31 | 2013-05-08 | 上海宝冶集团有限公司 | Cooling device used for high temperature remainder iron cutting |
| CN103103303A (en) * | 2011-11-15 | 2013-05-15 | 上海宝冶集团有限公司 | Method for disintegrating large-scale blast furnace residual iron |
-
2019
- 2019-01-25 CN CN201910073713.3A patent/CN109576427B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1097237A (en) * | 1993-06-23 | 1995-01-11 | 曲来印 | The splitting method and the splitter thereof that are used for exploitation of stone |
| CN103088171A (en) * | 2011-10-31 | 2013-05-08 | 上海宝冶集团有限公司 | Cooling device used for high temperature remainder iron cutting |
| CN103103303A (en) * | 2011-11-15 | 2013-05-15 | 上海宝冶集团有限公司 | Method for disintegrating large-scale blast furnace residual iron |
Non-Patent Citations (1)
| Title |
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| 浅谈大型高炉大修金属残铁劈裂爆破施工技术;黄勇;《中国建筑金属结构》;20130430(第4期);第42-43页 * |
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