CN114087131A - Grouting-free dry-type connection fragmentation prefabricated assembly type concrete tower barrel rapid and efficient hoisting method - Google Patents
Grouting-free dry-type connection fragmentation prefabricated assembly type concrete tower barrel rapid and efficient hoisting method Download PDFInfo
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- CN114087131A CN114087131A CN202111274277.XA CN202111274277A CN114087131A CN 114087131 A CN114087131 A CN 114087131A CN 202111274277 A CN202111274277 A CN 202111274277A CN 114087131 A CN114087131 A CN 114087131A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
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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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- 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
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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
- Y02E10/728—Onshore wind turbines
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- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention provides a quick and efficient hoisting method for a grouting-free dry-type connection slicing prefabricated assembled concrete tower barrel, wherein four 1/4 circular-arc-shaped prefabricated concrete ring pieces are spliced into a circular tower section on site, and hoisting is carried out immediately after splicing is finished, so that the strength increase waiting time of a concrete ring piece splicing joint adhesive is reduced, and the construction time period is greatly saved. When in hoisting, the adjacent upper and lower sections of tower sections are supported by four gaskets and the water-saving flatness of the upper section of tower is corrected, the top gasket of each section of tower section is positioned at the assembling longitudinal joint of the upper section of tower section, namely the adjacent ends of the adjacent concrete ring plates occupy the same gasket, and the heights of the four gaskets are the same, so that the bottom supporting point of the tower section which is just assembled is ensured to be uniformly stressed, the risk of the upper and lower dislocation of the adjacent ring plates caused by the unevenness and the nonuniformity of the supporting point is avoided, and the waiting time for the strength increase of the adhesive between the adjacent upper and lower sections of tower sections is correspondingly reduced.
Description
Technical Field
The invention belongs to the technical field of onshore wind power concrete tower barrels, and particularly relates to a quick and efficient hoisting method for a grouting-free dry-type connection slicing prefabricated assembled concrete tower barrel.
Background
With the rapid development and construction of wind resources in China, wind generating sets gradually develop to high power and high altitude, and the traditional flexible all-steel tower technology is difficult to meet the requirements of wind generating set towers with high rigidity and large diameters. In recent years, with the popularization and application of the assembly type concrete technology in China, the application of the segmental prefabricated assembly type concrete tower barrel in the field of wind power generation is increasingly common, and the defects of low rigidity and small diameter of a flexible steel tower are effectively overcome. However, the speed and precision of the hoisting process of the fabricated concrete tower drum greatly affect the construction period and the investment cost, and how to ensure the hoisting precision and the construction speed of the fabricated concrete tower drum becomes a new challenge and a new problem to be faced by the fabricated concrete tower drum technology in the wind power industry in future.
Disclosure of Invention
The invention aims to provide a quick and efficient hoisting method for a grouting-free dry type connection segmented prefabricated concrete tower barrel, which aims to overcome the defects in the prior art, realize the immediate hoisting of the segmented prefabricated concrete tower barrel after the assembly on a construction site in the technical field of wind power, realize the assembly and the hoisting, ensure that the integral verticality deviation of a tower meets the requirement, ensure that the horizontal seam adhesive between circular tower sections is compact, and realize the efficient and rapid integral hoisting link.
Therefore, the above purpose of the invention is realized by the following technical scheme:
before operation, the levelness of the connecting area of the top surface of the hollow gear-shaped fan foundation and the tower section is measured and checked, the maximum height difference is not larger than 4mm, and if the maximum height difference exceeds 4mm, polishing is carried out until the specified requirements are met.
When the first section of tower section is hoisted, the contact area of the first section of tower section and the top surface of the hollow gear-shaped fan foundation is coated with an adhesive for building structure, and the principle of 'first floating and then scraping high' is followed, namely all the adhesive is firstly scraped to be horizontal, and then the height is scraped by a tooth scraper to be a positive and negative C-shaped concave-convex wavy groove so as to be used as an exhaust duct, thereby improving the compaction effect of the adhesive; the C shape is used for positioning the start point and the stop point of each concave-convex ribbed groove line at the same side (inner side or outer side) of the tower section, so that the factor of generating outer side seepage water to enter an inner side channel is reduced; the thickness of the applied adhesive is controlled according to the actual measurement height of the contact area of the tower section, and the thickness of the applied adhesive is controlled by increasing the maximum seam height by 2 mm.
The tower section is hoisted through two positioning pins, so that the tower section is accurately positioned.
After each section of tower section is hoisted, firstly measuring, checking and marking the levelness of the top surface. If the error is within the required range, according to the measurement result, installing high-strength plastic plate gaskets (4 in total) at the center of the top surface of each (1/4 circular arc precast concrete ring) to ensure that each adjacent concrete ring is located on the same gasket when the next ring tower section is hoisted in place, namely the adjacent rings occupy the area of the pressure gasket 1/2, and the top surfaces of all the gaskets are the same in elevation; if the measured levelness exceeds the specified range, polishing until the levelness meets the requirement, cleaning, and finally, constructing the gasket according to the method.
And (3) coating the adhesive on the top of the tower section, wherein the thickness of the adhesive is 2mm, and the top surface of the adhesive exceeds the top height of the high-strength plastic plate gasket in the same way.
The first tower section is pre-installed before installation, and the height of a gap between the first tower section and a base is measured to guide the thickness of the adhesive to be coated so as to improve the guarantee rate of adhesive compactness.
According to the construction method, the grouting-free dry type connection fragment prefabricated concrete tower barrel can be quickly and accurately hoisted in the technical field of wind power, the hoisting requirement of the grouting-free dry type connection fragment prefabricated concrete tower barrel is met, the strength increase waiting time of adhesives smeared between the annular tower sections formed by splicing four 1/4 circular-arc prefabricated concrete ring sections and the adjacent tower sections in a construction site is saved, and the deviation of levelness and verticality in the hoisting process of each section of tower section is corrected.
The invention provides a quick and efficient hoisting method for a grouting-free dry-type connection fragmentation prefabricated assembly type concrete tower barrel, which has the following beneficial effects:
1) the grouting-free dry-type connection fragmentation prefabricated assembly type concrete tower barrel rapid and efficient hoisting method is characterized in that four 1/4 circular-arc-shaped prefabricated concrete ring pieces are spliced into a circular tower section on site, hoisting is performed immediately after splicing is completed, the strength increase waiting time of concrete ring piece splicing joint adhesives is reduced, and the construction time period is greatly saved.
2) When the tower section is hoisted in place, the positioning pins are installed on site through the positioning pin screw holes and the positioning holes which are pre-embedded in the prefabricating process, the length of each positioning pin is one section, the long positioning pins penetrate into the positioning holes firstly when the tower section is in place, and then the short positioning pins penetrate through the long positioning pins, so that the operation is simple, convenient and rapid, and the positioning precision is high.
3) And the adhesive smearing mode between adjacent tower sections is convenient to operate, the adhesive in the horizontal joint is dense, the integral pressure resistance is improved, and the water seepage risk is reduced.
4) When the tower joint is hoisted, the water-saving flatness of the upper section tower is supported and corrected through four gaskets between adjacent upper and lower section tower sections, the top gasket of each section of tower section is positioned at the assembling longitudinal joint of the upper section tower section, namely the adjacent ends of adjacent concrete gaskets occupy the same gasket, and the heights of the four gaskets are the same, so that the bottom supporting point of the tower section just assembled is ensured to be uniformly stressed, the risk of dislocation of the adjacent gaskets on and under the adjacent rings due to uneven supporting points is avoided, and the waiting time for increasing the strength of the adhesive between the adjacent upper and lower section tower sections is correspondingly reduced.
5) The elevations of the top surfaces of the four gaskets on the top surface of each section of tower section are the same, namely the hoisting levelness and the verticality of each section of tower section are corrected, and the integral verticality guarantee rate of the tower barrel is improved.
Drawings
Fig. 1 is a flow chart illustrating a method for quickly and efficiently hoisting a grouted dry-type connection piece-by-piece prefabricated assembled concrete tower drum provided by the invention.
Fig. 2a-2b are a plan view and a cross-sectional view, respectively, of a hollow gear-like wind turbine foundation.
Fig. 3a-3b are schematic diagrams of the tower section, the foundation and the part between adjacent tower sections coated with the adhesive and partial schematic diagrams of the scratch of the coated adhesive respectively.
Fig. 4 is a schematic view of the installation of the high-strength plastic plate gasket.
Fig. 5 is a schematic diagram of a circular tower section spliced by four circular arc-shaped precast concrete ring sheets of 1/4.
Fig. 6 is a schematic view of two types of locating pins.
Fig. 7 is a schematic view of a screw hole of an embedded positioning pin.
Fig. 8 is a schematic view of the pre-buried positioning holes.
Fig. 9 is a schematic view of a tooth scraper.
FIG. 10 is a schematic illustration of a steel-concrete transition section.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in fig. 1 to 10, a grouting-free dry-type connection slicing prefabricated assembly type concrete tower tube rapid hoisting method comprises the following processes:
at the beginning of each construction shift, the preparation work before the construction operation is firstly completed: (1) the construction working face matched equipment and conditions meet requirements, and the construction working face matched equipment and conditions comprise that the hollow gear-shaped fan foundation 1 is qualified in acceptance, four 1/4 circular-arc precast concrete annular sheets are connected into an annular tower section 2, working face assembling and starting conditions are met, large pieces of electrical equipment in a tower are installed in place, hoisting machinery and personnel equipment have hoisting conditions, and no rainfall occurs in the weather; (2) preparing a construction material, which comprises a positioning pin 3, a building structure adhesive 4 and a high-strength plastic plate gasket 5; (3) the tool preparation includes a tooth scraper 6, a level measuring instrument 7, an angle grinder 8, a marking pen 9, a hand-held electric mixer 10, a wrench 11, a feeler 12, and the like.
At the beginning of each construction shift, firstly, the compliance of main parameters of the wind turbine foundation is rechecked, the levelness of a connection area 13 between the foundation and the tower section is measured, and the levelness is not more than 4mm (the highest point elevation-the lowest point elevation) to the maximum, otherwise, the wind turbine foundation is polished by an angle grinder 8 until the requirements are met.
The connecting area 13 between the foundation and the tower section is cleaned up, obvious dust, sundries, cracks, looseness and the like do not exist, and the contact range 14 between the inner side and the outer side of the tower section 2 and the foundation 1 is marked to provide range guidance for subsequently coating the adhesive 4.
The positioning pin 3 is installed, the positioning pin 3 is installed in a central symmetry mode through the tower section 2, the wrench 11 is adopted to be screwed into the embedded positioning pin screw hole 20, and the positioning pin 3 is long and short, so that the tower section 2 can be conveniently hoisted in place.
And (3) hoisting the first section of tower section 2, suspending when the tower section is hoisted to be about 1.5 m away from the ground, checking and cleaning stains and sundries at the bottom of the tower section 2, wiping the tower section cleanly, checking the positioning hole 15, and pre-hoisting in place after the error is confirmed. When the positioning hole 15 is located, one positioning hole 15 is firstly sleeved on the long positioning pin 3, the tower section 2 can rotate around the sleeved positioning pin 3 for fine adjustment, when the positioning hole 15 on the opposite side is located right above the positioning pin 3, the tower section 2 slowly falls down, the positioning is completed, and the pre-hoisting is located. Then the gap height between the tower section 2 and the top surface of the foundation 1 is measured and marked by a feeler 12, the measuring point is not lower than 8, wherein the maximum gap height is included.
The first tower section 2 is lifted, meanwhile, building structure adhesives 4 are applied, the adhesives 4 are generally divided into A, B groups, the adhesives are blended and mixed on site and fully and uniformly stirred by a handheld electric stirrer 10 (the performance of the used adhesives 4 is matched with the temperature of the construction site, attention is paid to the fact that the performance of the used adhesives 4 is matched with the temperature of the construction site), then the adhesives 4 are uniformly coated along the marked range 14, and the thickness of the adhesives 4 is controlled by adding 2mm on the basis of measuring the marked seam height value; as shown in fig. 3a and 3b, the adhesive 4 is scraped into concave-convex waves by a tooth scraper 6, the shape of the concave-convex waves is a C-shaped trend, and the length of the concave-convex waves is about 1 m, so that an exhaust channel is formed; two adjacent C-shaped openings are opposite in direction, and the inner side and the outer side of the tower section 2 are prevented from being provided with through water seepage channels.
Slowly lowering the tower section 2, observing the compact condition of the adhesive 4, ensuring that the adhesive 4 overflows from the whole horizontal seam (within the range of 360 degrees), completely loosening the lifting hook, removing the overflowed redundant adhesive 4, and removing the lifting hook.
Measuring the levelness of the top surface of the first tower section 2, wherein the number of measuring points is not less than 8 (four prefabricated ring pieces 16 are respectively connected with the longitudinal joint 17 and the center 18 of the top surface at equal parts of a circular ring 1/8, and the relative elevations of all measuring points are marked, increasing 2mm of the highest point elevation in the measuring points as the top surface elevation of a gasket 5, and totally installing four gaskets 5, wherein the top elevations of the gaskets 5 are the same and are respectively positioned at the center 18 of the top surface of each concrete ring piece 16, so that the adjacent two concrete ring pieces 16 are supported and stressed on the same gasket 5 when the next tower section 2 is hoisted in place, thereby avoiding the phenomenon that the vertical joint 17 of the tower section 2 which is just assembled slides up and down to form a wrong platform when the strength of an adhesive 4 is not increased enough, and the size of the gasket 5 is preferably 75mm, and the adhesive 4 is coated on the upper surface and the lower surface when the gasket 5 is manufactured.
Installing a positioning pin 3 and applying an adhesive 4, wherein the positioning pin 3 is installed at the same time, the adhesive 4 is applied by the same method as that of the positioning pin 3, the coating thickness exceeds the top height of the gasket 5 by 2mm, and then the next section of tower section 2 is installed.
And continuously and circularly carrying out continuous hoisting until all tower sections are finished.
And after all the steps are finished, installing the reinforced concrete transition section 19, and hoisting the same tower section 2 according to the installation requirement.
Special case processing: (1) if the adhesive 4 is mixed with open water due to sudden rainfall in the coating process of the adhesive 4, stopping the operation, immediately cleaning the coated adhesive 4, and resuming the operation after the rainfall stops and the coated adhesive surface is dried; (2) after the adjacent tower sections 2 are hoisted in place, if the gaps between the tower sections 2 are through or no adhesive 4 overflows in a large range, the tower sections 2 are hoisted, and the adhesive 4 is applied again until the requirements are met.
The above-described embodiments are intended to illustrate the present invention, but not to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit of the present invention and the scope of the claims fall within the scope of the present invention.
Claims (10)
1. A quick and efficient hoisting method for a grouted dry-type connection fragmentation prefabricated assembly type concrete tower barrel is characterized by comprising the following steps of: the quick and efficient hoisting method for the grouting-free dry-type connection piece-by-piece prefabricated assembled concrete tower barrel comprises the following steps:
(1) firstly, measuring, detecting and recording the levelness of a connecting area between the top plane of a hollow gear-shaped fan foundation and an annular tower section, installing a positioning pin after meeting the requirement, and splicing four 1/4 circular-arc precast concrete annular sheets into an annular tower section to be pre-hung and installed in place;
(2) then, measuring and recording the height of a seam between the tower section and the foundation, hoisting the tower section, smearing adhesive with corresponding thickness according to the height measurement result of the seam, placing the first tower section in place, and removing the excessive adhesive overflowing;
(3) splicing four 1/4 circular-arc precast concrete ring pieces into circular tower sections, vertically stacking the circular tower sections upwards in sequence, determining the relative plane position between the upper and lower adjacent tower sections through positioning pins, and then connecting the two sections of upper and lower adjacent tower sections by adopting an adhesive;
(4) measuring the levelness of the top of each section of tower section after the tower section is installed in place, installing high-strength plastic plate gaskets according to the measuring result, wherein the heights of the tops of the high-strength plastic plate gaskets are the same, installing positioning pins, coating adhesive, hoisting the next section, sequentially hoisting in a circulating manner, and finally hoisting the steel-concrete transition section.
2. The grouting-free dry-type connection slicing prefabricated assembled concrete tower barrel rapid and efficient hoisting method according to claim 1, characterized in that: the levelness of the connecting area between the top plane of the hollow gear-shaped fan foundation and the circular tower section meets the requirement, otherwise, the top plane of the hollow gear-shaped fan foundation and the circular tower section is polished to be flat until the requirement is met, and the top plane is cleaned up.
3. The grouting-free dry-type connection slicing prefabricated concrete tower barrel rapid and efficient hoisting method according to claim 1 or 2, characterized in that: before the first section of circular tower section is hoisted, the levelness of the connecting area between the top plane of the hollow gear-shaped fan foundation and the circular tower section is measured, and the horizontal height difference is less than or equal to 4mm, so that the requirement is met, and if the horizontal height difference exceeds the height difference, the horizontal height difference is polished to be less than or equal to 4 mm.
4. The grouting-free dry-type connection slicing prefabricated assembled concrete tower barrel rapid and efficient hoisting method according to claim 1, characterized in that: after the levelness of the connecting area of the top plane of the hollow gear-shaped fan foundation and the annular tower section meets the requirement, pre-hoisting the first tower section in place, measuring and marking the seam height between the tower section and the foundation by using a feeler gauge, hoisting the tower section, coating an adhesive on the upper surface of the hollow gear-shaped fan foundation, and determining the coating thickness according to seam height data; when in smearing, the tooth scraper is adopted to scrape the adhesive into a concave groove in a forward and reverse C-shaped concave-convex wave shape so as to play a role of an exhaust hole.
5. The grouting-free dry-type connection slicing prefabricated assembled concrete tower barrel rapid and efficient hoisting method according to claim 1, characterized in that: after each section of tower section is hoisted, the levelness of the top surface of each section of tower section is measured immediately, building structure adhesive is coated after the levelness meets the requirement, and a tooth scraper is adopted to scrape a groove in a forward and reverse C shape to play a role of an exhaust duct.
6. The grouting-free dry-type connection slicing prefabricated assembled concrete tower barrel rapid and efficient hoisting method according to claim 1, characterized in that: after hoisting of each section of tower section is completed, measuring the levelness of the top surface of the tower section, wherein the horizontal height difference is less than or equal to 4mm, thus meeting the requirement; the number of the measuring points at the top of each section of tower section is respectively 8 parts of the longitudinal joint of the lower section of tower section and the center of each concrete ring, the highest point is screened out and marked by a marking pen so as to guide the control of the subsequent gluing thickness; then installing a positioning pin; and if the levelness of the measurement result is more than 4mm, polishing and flattening until the levelness meets the requirement, and cleaning.
7. The grouting-free dry-type connection slicing prefabricated assembled concrete tower barrel rapid and efficient hoisting method according to claim 1, characterized in that: and a high-strength plastic plate gasket is arranged at the center of the top of each concrete ring of the tower section, the thickness of each high-strength plastic plate gasket is controlled by the elevation of the top surface after installation, and the elevation of the top surface of each gasket is + 2mm of the highest point of the actual measurement.
8. The grouting-free dry-type connection slicing prefabricated assembled concrete tower barrel rapid and efficient hoisting method according to claim 7, characterized in that: and (3) coating an adhesive on the top surface of the tower section, wherein the thickness of the adhesive is that the top surface elevation is 2mm higher than that of the high-strength plastic plate after the adhesive is scraped by the tooth scraper.
9. The grouting-free dry-type connection slicing prefabricated concrete tower barrel rapid and efficient hoisting method according to claim 1 or 8, characterized in that: after the top surface of the tower section is coated with the adhesive, the tower section on the top surface is hoisted, and the extruded redundant adhesive is cleaned after the tower section is in place.
10. The grouting-free dry-type connection slicing prefabricated assembled concrete tower barrel rapid and efficient hoisting method according to claim 1, characterized in that: before each section of tower section is hoisted, the reserved positioning hole at the bottom of the tower section is checked and confirmed to be intact and effective, and sundries and stains are cleaned up.
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| CN202111274277.XA CN114087131A (en) | 2021-10-29 | 2021-10-29 | Grouting-free dry-type connection fragmentation prefabricated assembly type concrete tower barrel rapid and efficient hoisting method |
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| CN202111274277.XA CN114087131A (en) | 2021-10-29 | 2021-10-29 | Grouting-free dry-type connection fragmentation prefabricated assembly type concrete tower barrel rapid and efficient hoisting method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115354903A (en) * | 2022-08-24 | 2022-11-18 | 中国电建集团西北勘测设计研究院有限公司 | Method for leveling and adjusting levelness of flange on conversion section of hybrid tower drum |
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| CN113464370A (en) * | 2021-07-16 | 2021-10-01 | 上海市机电设计研究院有限公司 | Method for connecting concrete tower barrel convenient to disassemble |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354903A (en) * | 2022-08-24 | 2022-11-18 | 中国电建集团西北勘测设计研究院有限公司 | Method for leveling and adjusting levelness of flange on conversion section of hybrid tower drum |
| CN115354903B (en) * | 2022-08-24 | 2024-04-09 | 中国电建集团西北勘测设计研究院有限公司 | Leveling and adjusting method for flange levelness on mixing tower barrel conversion section |
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