CN113606093A - Method for replacing concrete tower barrel embedded anchor bolt - Google Patents
Method for replacing concrete tower barrel embedded anchor bolt Download PDFInfo
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- CN113606093A CN113606093A CN202110808461.1A CN202110808461A CN113606093A CN 113606093 A CN113606093 A CN 113606093A CN 202110808461 A CN202110808461 A CN 202110808461A CN 113606093 A CN113606093 A CN 113606093A
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- embedded bolt
- embedded
- bolt
- electroslag welding
- conductive tube
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a method for replacing a concrete tower barrel embedded anchor bolt, which comprises the following steps: 1. taking out the upper section of the embedded bolt, inserting the conductive tube (7) into the preformed hole and contacting with the top of the lower section (6) of the embedded bolt; 2. pouring electroslag welding flux (8) into the conductive tube; 3. the electroslag welding machine (9), the conductive tube, the lower section of the embedded bolt, the lower anchor plate (3) and the intact embedded bolt (5) are connected into a current loop; 4. the electroslag welding machine is electrified to melt the electroslag welding flux, so that the conductive pipe is welded on the lower section of the embedded bolt; 5. after the electroslag welding flux is cooled, the conductive tube is connected with the lower section of the embedded bolt into a whole, and the conductive tube is rotated to drive the lower section of the embedded bolt to be synchronously rotated and disassembled; 6. and taking out the lower sections of the conductive tube and the embedded bolt, and installing a new embedded bolt. The invention can quickly take out the lower section of the embedded bolt broken in the reserved hole of the concrete cylinder section, thereby realizing convenient replacement of the embedded anchor bolt.
Description
Technical Field
The invention relates to a tower barrel of a wind generating set, in particular to a method for replacing an embedded anchor bolt of a concrete tower barrel.
Background
Wind power generation is used as a clean energy technology and is widely applied to the three north area with good wind resources in China. As the development of the "three north" region is becoming saturated, wind power generation is progressing toward the inland region. Because the wind speed in the inland area is lower, and meanwhile, the power of the wind generating set is increased day by day, the diameter of a wind wheel is increased day by day, the height of a tower barrel is also increased day by day, and the height of the tower barrel of the land wind generating set in China at present reaches 120-160 m. A tower barrel of a wind generating set in the prior art comprises a concrete tower barrel, a steel tower barrel and a steel-concrete mixed tower barrel.
In the steel-concrete hybrid tower cylinder, the connection mode of the steel tower cylinder and the concrete tower cylinder is various, wherein the connection mode that a plurality of embedded bolts 5 are embedded in the top of the concrete tower cylinder 1 and the steel tower cylinder 2 is connected through the embedded bolts 5 is simple in construction mode, and the application range is wide, as shown in the attached drawing 1.
In the operation process of fan, because the embedded anchor surface receives reasons such as mar, the inside hidden crackle of embedded anchor can lead to embedded anchor fatigue fracture to destroy, the bearing capacity at concrete tower section of thick bamboo and steel tower section of thick bamboo connection position reduces, leads to unstable operating mode such as wind generating set tower section of thick bamboo vibration, the security of direct influence wind generating set tower section of thick bamboo. In order to ensure the operation safety of the tower of the wind generating set, two measures can be generally taken:
firstly, the generated power of the fan is limited, the bearing capacity of the residual intact embedded anchor bolts can meet the requirements, but the generated power of the fan is reduced, so that the generated energy of a wind field is reduced, and the benefit is reduced.
And secondly, replacing the broken and damaged embedded bolts. The arrangement mode of the embedded bolt in the concrete tower barrel in the prior art comprises a fixed mode and a detachable mode.
For fixed embedded bolt, because embedded bolt pours in concrete tower section of thick bamboo, can't dismantle, can only change whole concrete shell ring, need dismantle impeller, cabin, steel tower section of thick bamboo and hang down, release steel strand wires prestressing force again, then dismantle the change with concrete shell ring, the concrete shell ring is changed and is accomplished the back and again stretch out steel strand wires to install steel tower section of thick bamboo, cabin, impeller, whole process is time-consuming, takes a lot of work, and the cost is very high.
For detachable embedded bolt, embedded bolt passes through the anchor slab and installs in the preformed hole of concrete shell ring, though embedded bolt can be taken out, nevertheless because the preformed hole aperture of installation embedded bolt is less, and the fracture site randomness is high, and the degree of depth of possible fracture site in the preformed hole is darker, and extracting tool can't insert to the preformed hole in. Meanwhile, the aperture of the pre-embedded hole is only slightly larger than that of the pre-embedded bolt (usually 3-5 mm), and an operation space for the rotary disassembly of the pre-embedded bolt cannot be provided, so that the lower section of the pre-embedded bolt broken in the concrete tower barrel is still difficult to take out in actual operation, and the replacement of the pre-embedded bolt is influenced.
Disclosure of Invention
The invention aims to provide a method for replacing an embedded anchor bolt of a concrete tower barrel, which can quickly take out the lower section of the embedded bolt broken in a reserved hole of a concrete barrel section, thereby realizing convenient replacement of the embedded anchor bolt.
The invention is realized by the following steps:
a replacement method of a concrete tower barrel embedded anchor bolt is applied to replacement of a detachable embedded bolt in a concrete barrel section, the upper end and the lower end of the embedded bolt are respectively installed on an upper anchor plate and a lower anchor plate, and after the embedded bolt is broken into an upper embedded bolt section and a lower embedded bolt section, the lower embedded bolt section is remained in the concrete barrel section;
the method for replacing the concrete tower barrel embedded anchor bolt comprises the following steps:
step 1: after the upper section of the broken embedded bolt is taken out, inserting a conductive pipe into a preformed hole for installing the embedded bolt, and enabling the lower end of the conductive pipe to be in contact with the top of the lower section of the embedded bolt;
step 2: pouring electroslag welding flux into the conductive pipe, so that the electroslag welding flux covers the top of the lower section of the embedded bolt;
and step 3: connecting one end of an electroslag welding machine with the conductive pipe, and connecting the other end of the electroslag welding machine with one intact embedded bolt, so that a current loop can be formed among the electroslag welding machine, the conductive pipe, the lower section of the embedded bolt, the lower anchor plate and the intact embedded bolt;
and 4, step 4: electrifying the electroslag welding machine to melt the electroslag welding flux, so that the conductive pipe is welded on the lower section of the embedded bolt through the melted electroslag welding flux;
and 5: after the melted electroslag welding flux is cooled and solidified, the conductive tube and the lower section of the embedded bolt are connected into an integral structure, and the conductive tube is rotated to drive the lower section of the embedded bolt to be synchronously rotated and disassembled;
step 6: and taking out the lower sections of the conductive tube and the embedded bolt, and installing a new embedded bolt to finish the replacement of the embedded bolt.
The upper end of the conductive pipe extends to the upper part of the concrete cylinder section.
The conductive tube is of a hollow tubular structure, and the outer diameter of the conductive tube is not more than the diameter of the embedded bolt.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the lower sections of the embedded bolts are butted through the conductive pipes, the conductive performance of the lower anchor plates connected to the bottoms of the embedded bolts is fully utilized, a current loop can be formed among the conductive pipes, the lower sections of the embedded bolts, the lower anchor plates and the intact embedded bolts, the electroslag welding flux is melted by electrifying the electroslag welding machine, so that the conductive pipes and the lower sections of the embedded bolts are connected into a whole, the dismounting operation of the lower sections of the embedded bolts is transferred from the inside of the reserved holes to the outside of the reserved holes, the dismounting of the lower sections of the embedded bolts is simpler and faster, and the problem that the lower sections of the embedded bolts are difficult to take out due to the fact that a manual or bolt dismounting tool cannot go deep into the reserved holes and does not have enough operating space in the reserved holes is solved.
2. According to the invention, the conductive tube is welded and fixed with the lower section of the embedded bolt, so that the rotation of the lower section of the embedded bolt can be directly controlled through the conductive tube, the disassembly of the lower section of the embedded bolt is completed, the operation is convenient, rapid and efficient, the quick replacement of the embedded bolt is realized, the operating power of a fan does not need to be reduced, the whole concrete cylinder section does not need to be replaced, the replacement and maintenance time and cost are greatly shortened, and the economic benefit of the wind generating set is ensured to the greatest extent.
The invention fully utilizes the conductive performance of the lower anchor plate connected to the bottom of each embedded bolt, connects the conductive pipe with the lower sections of the embedded bolts under the action of the welding machine, and achieves the purpose of quickly taking out the lower sections of the embedded bolts broken in the reserved holes of the concrete cylinder sections by utilizing the conductive pipe, thereby realizing convenient replacement of the embedded bolts and being suitable for the disassembly and replacement of the embedded bolts detachably installed in the concrete cylinder sections.
Drawings
FIG. 1 is a schematic structural view of a concrete tower drum anchor bolt of the prior art;
fig. 2 is a schematic view showing the breakage of an anchor bolt in the method for replacing a concrete tower tube anchor bolt according to the present invention.
Fig. 3 is an operational view illustrating a method of replacing a concrete tower drum anchor according to the present invention.
In the figure, 1 concrete cylinder section, 2 steel tower cylinder, 3 lower anchor plates, 4 upper anchor plates, 5 embedded bolts, 6 lower embedded bolt sections, 7 conductive pipes, 8 electroslag welding flux and 9 electroslag welding machines.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to the attached drawing 2, the method for replacing the concrete tower tube embedded anchor is applied to the replacement of the detachable embedded bolt 5 in the concrete shell section 1, the upper end and the lower end of the embedded bolt 5 are respectively installed on the upper anchor plate 4 and the lower anchor plate 3 through nuts, and the upper end of the embedded bolt 5 is connected with the steel tower tube 2. After the embedded bolt 5 is broken into the embedded bolt upper section and the embedded bolt lower section 6, the embedded bolt upper section can be taken out in a threaded rotation mode, and the embedded bolt lower section 6 remains in the concrete shell ring 1.
The method for replacing the concrete tower barrel embedded anchor bolt comprises the following steps:
referring to fig. 3, step 1: after the upper section of the broken embedded bolt is taken out, the conductive tube 7 is inserted into a preformed hole for installing the embedded bolt, so that the lower end of the conductive tube 7 is in contact with the top of the lower section 6 of the embedded bolt.
Preferably, the upper end of the conductive pipe 7 extends to the upper part of the concrete cylinder section 1, so that the disassembly operation outside the reserved hole is convenient.
Preferably, the length of the conductive tube 7 is 1-1.5m, and the length of the conductive tube 7 can be adjusted according to the depth of the fracture position of the embedded bolt 5 in the reserved hole.
Step 2: and pouring electroslag welding flux 8 into the conductive pipe 7, so that the electroslag welding flux 8 covers the top of the lower section 6 of the embedded bolt.
Preferably, the conductive tube 7 is a hollow tubular structure, and the outer diameter of the conductive tube 7 is not more than the diameter of the embedded bolt 5, so that the conductive tube 7 can be inserted into the reserved hole, no gap exists between the conductive tube 7 and the embedded bolt 5, and the electroslag welding flux 8 is prevented from leaking from the gap.
Preferably, the wall thickness of the conductive tube 7 is 2-5mm, and the conductive tube 7 can be made by cutting a steel tube.
And step 3: one end of an electroslag welding machine 9 is connected with the conductive pipe 7, and the other end of the electroslag welding machine 9 is connected with one intact embedded bolt 5, so that a current loop can be formed among the electroslag welding machine 9, the conductive pipe 7, the lower segment 6 of the embedded bolt, the lower anchor plate 3 and the intact embedded bolt 5.
And 4, step 4: and electrifying the electroslag welding machine 9 to melt the electroslag welding flux 8, so that the conductive tube 7 is welded on the lower section 6 of the embedded bolt through the melted electroslag welding flux 8.
And 5: after the melted electroslag welding flux 8 is cooled and solidified, the conductive tube 7 and the lower section 6 of the embedded bolt are connected into an integral structure, and the conductive tube 7 is rotated to drive the lower section 6 of the embedded bolt to rotate synchronously, so that the lower section 6 of the embedded bolt is detached and separated from the nut of the lower anchor plate 3.
Step 6: and taking out the conductive tube 7 and the lower section 6 of the embedded bolt, installing a new embedded bolt 5, and finishing the replacement of the embedded bolt 5.
When installing the new embedded bolt 5, the new embedded bolt 5 is the same as the original embedded bolt 5 in specification. The lower end of the new embedded bolt 5 is screwed into the nut of the lower anchor plate 3 through threads, and the upper end of the new embedded bolt 5 is locked on the upper anchor plate 4 through the nut.
Example 1:
certain buried bolt 5 breaks in concrete shell ring 1, and this buried bolt 5's diameter is 48mm for the preformed hole aperture of installation buried bolt 5 is 52mm, and buried bolt 5's fracture position is close to the middle part, can't take out buried bolt hypomere 6 through prior art's bolt extracting tool.
The concrete operations of disassembling the lower section 6 of the embedded bolt and installing the new embedded bolt 5 are as follows:
step 1: after the upper section of the broken embedded bolt is taken out, a steel pipe with the diameter of 42mm, the wall thickness of 3mm and the length of 1.2m is taken as a conductive pipe 7, the conductive pipe 7 is inserted into a preformed hole for installing the embedded bolt, the lower end of the conductive pipe 7 is in contact with the top of the lower section 6 of the embedded bolt, and the upper end of the conductive pipe 7 extends to the upper part of the concrete cylindrical shell 1 and is positioned about 30cm above the upper anchor plate 4.
Step 2: and pouring electroslag welding flux 8 into the conductive pipe 7, so that the electroslag welding flux 8 covers the top of the lower section 6 of the embedded bolt.
And step 3: one end of an electroslag welding machine 9 is connected with the conductive tube 7, the other end of the electroslag welding machine 9 is connected with one intact embedded bolt 5, and the conductive tube 7, the lower embedded bolt segment 6, the lower anchor plate 3 and the embedded bolt 5 are all made of conductive materials, so that a current loop can be formed among the electroslag welding machine 9, the conductive tube 7, the lower embedded bolt segment 6, the lower anchor plate 3 and the adjacent intact embedded bolt 5.
And 4, step 4: and electrifying the electroslag welding machine 9 to melt the electroslag welding flux 8, so that the conductive tube 7 is welded on the lower section 6 of the embedded bolt through the melted electroslag welding flux 8.
And 5: waiting for several minutes, after the melted electroslag welding flux 8 is cooled and solidified, the conductive tube 7 and the lower section 6 of the embedded bolt are connected into an integral structure, and the conductive tube 7 is rotated to drive the lower section 6 of the embedded bolt to rotate synchronously, so that the lower section 6 of the embedded bolt is detached and separated from the nut of the lower anchor plate 3.
Step 6: and (3) taking out the conductive tube 7 and the lower segment 6 of the embedded bolt, installing a new embedded bolt 5 with the same specification as the original embedded bolt 5, and locking the upper end and the lower end of the new embedded bolt 5 on the upper anchor plate 4 and the lower anchor plate 3 through nuts to complete the replacement of the embedded bolt 5.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A method for replacing a concrete tower barrel embedded anchor bolt is characterized by comprising the following steps: the replacement method is applied to replacement of detachable embedded bolts (5) in the concrete shell ring (1), the upper ends and the lower ends of the embedded bolts (5) are respectively installed on an upper anchor plate (4) and a lower anchor plate (3), and after the embedded bolts (5) are broken into an upper embedded bolt section and a lower embedded bolt section (6), the lower embedded bolt section (6) is remained in the concrete shell ring (1);
the method for replacing the concrete tower barrel embedded anchor bolt comprises the following steps:
step 1: after the upper section of the broken embedded bolt is taken out, inserting a conductive tube (7) into a preformed hole for installing the embedded bolt, and enabling the lower end of the conductive tube (7) to be in contact with the top of the lower section (6) of the embedded bolt;
step 2: pouring electroslag welding flux (8) into the conductive pipe (7) to enable the electroslag welding flux (8) to cover the top of the lower section (6) of the embedded bolt;
and step 3: one end of an electroslag welding machine (9) is connected with the conductive tube (7), and the other end of the electroslag welding machine (9) is connected with one of the embedded bolts (5), so that a current loop can be formed among the electroslag welding machine (9), the conductive tube (7), the lower segment (6) of the embedded bolt, the lower anchor plate (3) and the embedded bolt (5);
and 4, step 4: the electroslag welding machine (9) is electrified to melt the electroslag welding flux (8), so that the conductive pipe (7) is welded on the lower section (6) of the embedded bolt through the melted electroslag welding flux (8);
and 5: after the melted electroslag welding flux (8) is cooled and solidified, the conductive tube (7) is connected with the lower section (6) of the embedded bolt into an integral structure, and the conductive tube (7) is rotated to drive the lower section (6) of the embedded bolt to rotate synchronously for dismounting;
step 6: and taking out the conductive tube (7) and the lower section (6) of the embedded bolt, and installing a new embedded bolt (5) to finish the replacement of the embedded bolt (5).
2. The method for replacing a concrete tower drum anchor according to claim 1, wherein the method comprises the following steps: the upper end of the conductive pipe (7) extends to the upper part of the concrete shell ring (1).
3. The method for replacing a concrete tower drum anchor according to claim 1, wherein the method comprises the following steps: the conductive tube (7) is of a hollow tubular structure, and the outer diameter of the conductive tube (7) is not more than the diameter of the embedded bolt (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110808461.1A CN113606093A (en) | 2021-07-16 | 2021-07-16 | Method for replacing concrete tower barrel embedded anchor bolt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110808461.1A CN113606093A (en) | 2021-07-16 | 2021-07-16 | Method for replacing concrete tower barrel embedded anchor bolt |
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| CN113606093A true CN113606093A (en) | 2021-11-05 |
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| CN202110808461.1A Pending CN113606093A (en) | 2021-07-16 | 2021-07-16 | Method for replacing concrete tower barrel embedded anchor bolt |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2622249A1 (en) * | 1976-05-19 | 1977-11-24 | Berthold Wanke | Concrete railway sleeper broken screw shaft removal - using activating bolt butt welded to broken surface and subsequently reusable |
| CN103727362A (en) * | 2012-10-10 | 2014-04-16 | 尚幔幔 | Construction technology used for quickly replacing high-strength placing anchor bolts in concrete |
| CN105312765A (en) * | 2015-12-09 | 2016-02-10 | 中广核工程有限公司 | Nuclear power plant unipolar magnetic control band electrode electroslag surfacing method and device |
| CN105421482A (en) * | 2015-12-30 | 2016-03-23 | 北京健安诚岩土工程有限公司 | Method for replacing high-strength screw for prestressed pipe pile foundation and prestressed pipe pile foundation adopting method |
| CN107254884A (en) * | 2017-07-28 | 2017-10-17 | 湖南大学 | A kind of detachable prefabricated assembled concrete-filled steel square tubular column pin node |
| CN207145416U (en) * | 2017-08-31 | 2018-03-27 | 大唐长春第三热电厂 | The detachable screw of built-in type |
| CN108500446A (en) * | 2018-02-26 | 2018-09-07 | 中国华冶科工集团有限公司 | A kind of consumable nozzle electroslag soldering method and its spark blowout |
| CN208428205U (en) * | 2018-04-20 | 2019-01-25 | 新誉集团有限公司 | Break bolt withdrawing device |
| CN209565628U (en) * | 2018-11-29 | 2019-11-01 | 安徽科汇钢结构工程有限公司 | A kind of box column welding electroslag processing unit |
-
2021
- 2021-07-16 CN CN202110808461.1A patent/CN113606093A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2622249A1 (en) * | 1976-05-19 | 1977-11-24 | Berthold Wanke | Concrete railway sleeper broken screw shaft removal - using activating bolt butt welded to broken surface and subsequently reusable |
| CN103727362A (en) * | 2012-10-10 | 2014-04-16 | 尚幔幔 | Construction technology used for quickly replacing high-strength placing anchor bolts in concrete |
| CN105312765A (en) * | 2015-12-09 | 2016-02-10 | 中广核工程有限公司 | Nuclear power plant unipolar magnetic control band electrode electroslag surfacing method and device |
| CN105421482A (en) * | 2015-12-30 | 2016-03-23 | 北京健安诚岩土工程有限公司 | Method for replacing high-strength screw for prestressed pipe pile foundation and prestressed pipe pile foundation adopting method |
| CN107254884A (en) * | 2017-07-28 | 2017-10-17 | 湖南大学 | A kind of detachable prefabricated assembled concrete-filled steel square tubular column pin node |
| CN207145416U (en) * | 2017-08-31 | 2018-03-27 | 大唐长春第三热电厂 | The detachable screw of built-in type |
| CN108500446A (en) * | 2018-02-26 | 2018-09-07 | 中国华冶科工集团有限公司 | A kind of consumable nozzle electroslag soldering method and its spark blowout |
| CN208428205U (en) * | 2018-04-20 | 2019-01-25 | 新誉集团有限公司 | Break bolt withdrawing device |
| CN209565628U (en) * | 2018-11-29 | 2019-11-01 | 安徽科汇钢结构工程有限公司 | A kind of box column welding electroslag processing unit |
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