CN115354903B - Leveling and adjusting method for flange levelness on mixing tower barrel conversion section - Google Patents
Leveling and adjusting method for flange levelness on mixing tower barrel conversion section Download PDFInfo
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- CN115354903B CN115354903B CN202211018284.8A CN202211018284A CN115354903B CN 115354903 B CN115354903 B CN 115354903B CN 202211018284 A CN202211018284 A CN 202211018284A CN 115354903 B CN115354903 B CN 115354903B
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- 238000000034 method Methods 0.000 title claims abstract description 73
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 142
- 239000010959 steel Substances 0.000 claims abstract description 142
- 239000004567 concrete Substances 0.000 claims abstract description 112
- 230000007704 transition Effects 0.000 claims abstract description 85
- 238000009434 installation Methods 0.000 claims abstract description 7
- 239000011521 glass Substances 0.000 claims description 15
- 239000011148 porous material Substances 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/34—Arrangements for erecting or lowering towers, masts, poles, chimney stacks, or the like
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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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- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention belongs to the technical field of concrete tower construction, and particularly relates to a leveling and adjusting method for flange levelness on a transition section of a mixed tower. According to the invention, the mixed tower barrel conversion section is subjected to high-standard installation by the seven steps of hoisting the middle section concrete tower barrel, measuring the levelness difference of different points on the middle section concrete tower barrel, hoisting the transition section concrete tower barrel, measuring and adjusting the levelness deviation of the embedded annular steel plate on the transition section concrete tower barrel, grouting along the upper edge of the middle section concrete tower barrel, hoisting the conversion section steel tower barrel, measuring the levelness of the upper flange of the conversion section steel tower barrel, tensioning the prestressed steel strand and tensioning the steel strand, and ensuring the levelness of the conversion section flange after hoisting and tensioning, thereby ensuring the safe operation of the fan. By adopting the technical scheme of the invention, the operation is simple, and the method is convenient and reliable.
Description
Technical Field
The invention belongs to the technical field of concrete tower construction, and particularly relates to a leveling and adjusting method for flange levelness on a transition section of a mixed tower.
Background
In the construction of a concrete tower in wind power generation engineering, the main construction procedure is in the prefabrication and hoisting processes of the concrete tower. In the structure of combining the novel concrete tower barrel with the steel tower barrel, after the last section of concrete tower barrel is lifted, a section of steel tower barrel is required to be installed as a conversion connecting section of a reinforced concrete structure, the levelness of a flange on the conversion section of the steel tower barrel has an important influence on the safe operation of the whole fan, and strict measurement on the levelness of the flange on the conversion section is required in the lifting and tensioning processes in order to ensure that the levelness of the flange on the conversion section is satisfied after the tensioning is completed.
Disclosure of Invention
The invention provides a leveling and adjusting method for the levelness of a flange on a conversion section of a mixing tower, and aims to provide a method for leveling and adjusting the levelness of a flange on a conversion section of a mixing tower.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for leveling and adjusting the levelness of a flange on a conversion section of a mixing tower comprises the following steps,
step one: hoisting middle section concrete tower barrel
After the middle section concrete tower is hoisted, measuring levelness difference values of different points on the middle section concrete tower;
step two: hoisting transition section concrete tower barrel
Hoisting the concrete tower of the transition section to the upper opening of the concrete tower of the middle section, measuring the levelness deviation of the embedded annular steel plate on the concrete tower of the transition section, leveling if the levelness deviation is larger than a preset value, and entering the third step if the levelness deviation is smaller than or equal to the preset value;
step three: setting slurry at the upper edge of the middle section concrete tower;
step four: hoisting conversion section steel tower barrel
Hoisting the steel tower cylinder of the transition section to the upper opening of the concrete tower cylinder of the transition section;
step five: measuring levelness of upper flange plate of conversion section steel tower barrel
Measuring the levelness of the outer ring, the middle ring and the inner ring of the upper flange plate of the steel tower barrel of the conversion section, leveling if the levelness of the outer ring, the middle ring and the inner ring deviate from each other by more than a preset value, and entering a step six until the levelness of the outer ring, the middle ring and the inner ring deviate from each other by less than the preset value;
step six: tensioning and pre-tightening the pre-stressed steel strand, and repeating the fifth step;
step seven: tensioning steel strand
In the tensioning process of the steel strand, the levelness of the upper flange plate is monitored in real time, if the levelness of the upper flange plate is larger than a preset value, adjustment is carried out, and after tensioning is completed, the levelness of the upper flange plate is finally measured once.
The concrete tower is horn-shaped, and the flatness deviation of the concrete surface of the lower edge opening is within 2 mm; a plurality of through steel strand pore canals are uniformly and vertically arranged on the side wall of the concrete tower barrel; 6 embedded steel plates are uniformly embedded in the surface of the upper edge opening, the 6 embedded steel plates and a plurality of steel strand pore channels are arranged in a staggered mode, and the flatness deviation of the upper surface of the 6 embedded steel plates is within 2mm.
And in the second step, the preset value of the levelness deviation of the embedded annular steel plate is 2mm.
The leveling method is that a gasket is placed on the embedded steel plate of the middle section concrete tower barrel for adjustment when the levelness deviation of the embedded annular steel plate is larger than a preset value; the gasket comprises a circular organic glass gasket with the thickness of 3mm and a circular steel gasket with the thickness of 1 mm; when in leveling use, one or the combination of an organic glass gasket and a 1mm thick steel gasket is adopted; the use number of the organic glass gaskets in combination is not more than 1 on one embedded steel plate.
The transition section concrete tower cylinder is a horn type with a small upper part and a large lower part, an embedded annular steel plate is arranged at the upper edge opening of the transition section concrete tower cylinder, and the transition section concrete tower cylinder is formed by pouring by adopting an inversion method.
The pouring and hoisting method of the transition section concrete tower cylinder comprises the following steps:
s1: installing and leveling the embedded annular steel plate on a prefabricated field;
s2: mounting inner form
When the inner template is installed, the mode that the upper opening faces downwards and the lower opening faces upwards is adopted for installation;
s3: binding steel bars at the outer side of the inner template, and reserving steel strand pore canals;
s4: two sleeves are embedded symmetrically on the side wall of the inner template;
the sleeve is pre-embedded at 1/2 of the side wall of the concrete tower barrel of the transition section;
s5: closing an outer side template, and pouring a conversion section tower barrel;
s6: s5, after the completion of the step S, removing the template;
s7: connecting a threaded rod in each embedded sleeve, and hanging a steel wire rope on the threaded rod;
s8: concrete tower drum for hoisting transition section
Lifting the poured transition section concrete tower barrel through a steel wire rope, wherein in the lifting process, the transition section concrete tower barrel automatically turns over due to the fact that the center of gravity is lowered, namely, the small opening faces upwards, and the large opening faces downwards; and hoisting the turned transition section concrete tower barrel to the middle section concrete tower barrel.
The outer ring and the inner ring of the upper flange plate of the steel tower barrel of the conversion section in the fifth step are respectively arranged 5cm away from the outer edge and the inner edge; the middle ring is positioned between the outer ring and the inner ring and is equidistant from the outer ring and the inner ring.
The leveling methods of the outer ring, the middle ring and the inner ring are the same; the leveling method of the outer ring is to measure one datum at every 45 degrees on the ring line of the outer ring, and obtain 8 points of levelness deviation values in total, wherein the deviation between every two levelness deviation values of 8 points is not more than 3mm.
And step six, when the prestressed steel strand is tensioned and pre-tensioned, the pre-tensioning force value is 15-25% of the total tensioning force.
The seventh stretching steel strand is stretched in a cross symmetry stretching mode, namely, the first group stretches in the directions of 0 degrees and 180 degrees, the second group stretches in the directions of 90 degrees and 270 degrees, and the like until stretching of all the steel strands is completed.
The beneficial effects are that:
(1) According to the invention, the middle section concrete tower barrel is hoisted, the levelness difference value of different points on the middle section concrete tower barrel is measured, the transition section concrete tower barrel is hoisted, the levelness deviation of the embedded annular steel plate on the transition section concrete tower barrel is measured and adjusted, the middle section concrete tower barrel is hoisted, the transition section steel tower barrel is hoisted, the levelness of the upper flange plate of the hoisting transition section steel tower barrel is measured, the prestressed steel stranded wires are tensioned and pre-tensioned, the mixed tower barrel transition section is subjected to high-standard installation, the levelness of the flange plate of the transition section after hoisting and tensioning is ensured, and the safe operation of a fan is ensured. By adopting the technical scheme of the invention, the operation is simple, and the method is convenient and reliable.
(2) According to the invention, the concrete tower barrel of the transition section is poured by adopting an inversion method, so that the levelness of the embedded annular steel plate on the upper edge opening of the concrete tower barrel meets the requirements.
(3) According to the invention, 8 points of the outer ring, the middle ring and the inner ring on the upper flange plate are respectively measured and adjusted, so that the deviation between levelness deviation values of the 8 points is ensured not to exceed 3mm.
(4) The gasket of the invention comprises a 3mm thick organic glass wafer and a 1mm thick steel wafer.
The foregoing description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention more clearly understood, it can be implemented according to the content of the specification, and the following detailed description of the preferred embodiments of the present invention will be given with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of the present invention.
Fig. 2 is a schematic view of a transition section concrete tower of the present invention.
Fig. 3 is a schematic view of a mid-section concrete tower of the present invention.
Fig. 4 is a schematic diagram of a transition piece connection of the present invention.
Fig. 5 is a schematic view of a plexiglass spacer of the invention.
Fig. 6 is a schematic view of a steel gasket of the present invention.
Fig. 7 is a schematic view of circumferential measurement of the upper flange of the transition piece steel drum of the present invention.
In the figure: 1. embedding an annular steel plate; 2. a transition section concrete tower drum; 3. embedding a steel plate; 4. a middle section concrete tower; 5. an upper flange plate; 6. a conversion section steel tower drum; 7. a lower flange; 8. an organic glass gasket; 9. a steel gasket; 10. an outer ring; 11. a middle ring; 12. an inner ring.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
according to the method for leveling and adjusting the levelness of the flange on the transition section of the mixing tower shown in figures 1-7, the method comprises the following steps,
step one: hoisting middle section concrete tower 4
After the middle section concrete tower 4 is hoisted, measuring levelness difference values of different points on the middle section concrete tower;
step two: hoisting transition section concrete tower 2
Hoisting the transition section concrete tower barrel 2 to the upper opening of the middle section concrete tower barrel 4, measuring the levelness deviation of the embedded annular steel plate 1 on the transition section concrete tower barrel 2, leveling if the levelness deviation is larger than a preset value, and entering the third step if the levelness deviation is smaller than or equal to the preset value;
step three: setting slurry at the upper edge of the middle section concrete tower 4;
step four: hoisting conversion section steel tower 6
Hoisting the transition section steel tower 6 to the upper opening of the transition section concrete tower 2;
step five: measuring levelness of upper flange 5 of conversion section steel tower 6
Measuring the levelness of the outer ring 10, the middle ring 11 and the inner ring 12 of the upper flange plate 5 of the conversion section steel tower cylinder 6, leveling if the levelness of the outer ring 10, the middle ring 11 and the inner ring 12 deviate from each other by more than a preset value, and entering a step six until the levelness of the outer ring 10, the middle ring 11 and the inner ring 12 deviate from each other by less than the preset value;
step six: tensioning and pre-tightening the pre-stressed steel strand, and repeating the fifth step;
step seven: tensioning steel strand
In the tensioning process of the steel strands, the levelness of the upper flange plate 5 is monitored in real time, if the levelness of the upper flange plate 5 is larger than a preset value, adjustment is carried out, and after tensioning is completed, the levelness of the upper flange plate 5 is finally measured once.
When in actual use, after the middle section concrete tower barrel 4 is hoisted, the levelness difference value of different points on the middle section concrete tower barrel is measured, the flatness deviation of the concrete surface of the lower edge opening is guaranteed to be within 2mm, the flatness deviation of the upper surface of the 6 embedded steel plates 3 which are uniformly embedded in the upper edge opening is all within 2mm, then the hoisting and the leveling of the transition section concrete tower barrel 2 are carried out, and the leveling of the transition section concrete tower barrel 2 is used for guaranteeing the flatness of the transition section steel tower barrel 6 which is hoisted later. After the hoisting and leveling of the transition section concrete tower drum 2 are completed, slurry is settled at the upper edge opening of the middle section concrete tower drum 4, and the slurry settled plays a role in firmly connecting the middle section concrete tower drum 4 with the transition section concrete tower drum 2; and then hoisting the transition section steel tower cylinder 6 to the upper opening of the transition section concrete tower cylinder 2, and measuring and adjusting the levelness of the upper flange 5 for hoisting the transition section steel tower cylinder 6. The levelness of the upper flange 5 is measured by firstly arranging three annular measuring rings, namely an inner ring measuring ring, a middle ring measuring ring and an outer ring measuring ring, on the disc surface of the upper flange 5. Because the levelness deviation of the upper flange plate 5 and the lower flange plate 7 of the conversion section steel tower cylinder 6 is within 2mm when leaving the factory. After being hoisted to the upper opening of the transition section concrete tower barrel 2, the levelness of each measuring ring is measured respectively, and the requirement is met only when the levelness deviation of the three circumferential measuring rings is within 3mm, and the hoisting procedure of the steel tower barrel can be entered; if the levelness deviation of the three annular measuring rings is larger than 3mm, the adjustment is needed, and the adjustment is carried out by adopting the following method: the deviation value is recorded, then the pretension is carried out, the tension value in the pretension process is 15% -25% of the design value, and the steel strand near the point with larger individual deviation can be used for the pretension with larger tension value. According to the invention, the levelness deviation on the inner, middle and outer three circumferential measuring rings is measured, so that the levelness of the whole upper flange plate is conveniently fitted by adopting modeling, and the flange plate levelness is ensured to meet the requirements, thereby meeting the design requirements of a fan and ensuring the safe operation of the fan.
In the process of stretching the steel strands, the levelness of the upper flange plate 5 is measured in real time, when individual deviation exists, the stretching force is adjusted in time, and after the steel strands are stretched, the levelness is measured again, so that the levelness deviation of the outer ring 10, the middle ring 11 and the inner ring 12 is ensured to be within 3mm.
According to the technical scheme, the mixing tower barrel conversion section is installed in a high standard mode, so that the levelness of the flange of the conversion section after hoisting and tensioning is guaranteed, and the safe operation of the fan is guaranteed. By adopting the technical scheme of the invention, the operation is simple, and the method is convenient and reliable.
Embodiment two:
the method for leveling and adjusting the levelness of the flange on the transition section of the mixing tower according to the embodiments shown in fig. 1, 3 and 4 is different from the first embodiment in that: the middle section concrete tower 4 is horn-shaped, and the surface flatness deviation of the concrete at the lower edge opening is within 2 mm; a plurality of through steel strand pore canals are uniformly and vertically arranged on the side wall of the middle section concrete tower barrel 4; the surface of the upper edge opening is uniformly embedded with 6 embedded steel plates 3, the 6 embedded steel plates 3 and a plurality of steel strand pore channels are arranged in a staggered manner, and the flatness deviation of the upper surface of the 6 embedded steel plates 3 is within 2mm.
When in actual use, in order to better combine the upper section of concrete tower barrel, the lower section of concrete tower barrel, namely the middle section of concrete tower barrel 4 and the transition section of concrete tower barrel 2, after the pouring of the tower barrel is completed, the upper opening of the middle section of concrete tower barrel 4 is a chiseled surface, and the embedded steel plate 3 on the upper surface of the middle section of concrete tower barrel 4 can be used as a leveling supporting point to ensure that the levelness after the gasket is placed meets the requirements.
The embedded steel plate 3 in this embodiment is a square steel plate.
Embodiment III:
according to the leveling and adjusting method for the flange levelness on the conversion section of the mixing tower shown in fig. 1 and 2, the first difference from the embodiment is that: and in the second step, the preset value of the levelness deviation of the embedded annular steel plate 1 is 2mm.
When in actual use, the preset levelness deviation value of the embedded annular steel plate 1 is set to be 2mm, so that the levelness adjustment of the installation of the subsequent tower is facilitated, and the overall safe and stable operation of the fan tower is ensured.
Embodiment four:
according to the method for leveling and adjusting the levelness of the flange on the transition section of the mixing tower shown in fig. 1-4, the first difference from the embodiment is that: the leveling method is that a gasket is placed on the embedded steel plate 3 of the middle section concrete tower 4 for adjustment when the levelness deviation of the embedded annular steel plate 1 is larger than a preset value; the gaskets comprise a circular organic glass gasket 8 with the thickness of 3mm and a circular steel gasket 9 with the thickness of 1 mm; one or the combination of the organic glass gasket 8 and the 1mm thick steel gasket 9 is adopted when leveling; the number of the organic glass gaskets 8 used in combination is not more than 1 on one embedded steel plate 3.
In actual use, in order to adjust levelness, a gasket-added mode is adopted for adjustment. The gaskets comprise a circular organic glass gasket 8 with the thickness of 3mm and a circular steel gasket 9 with the thickness of 1mm, and can be determined according to practical situations, and only the organic glass gasket 8, only the steel gasket 9 or the combination of the two gaskets are added. However, according to the test, the prestress tensioning force value is about 9000T, if a plurality of organic glass gaskets 8 are adopted, the fracture phenomenon can occur in the tensioning process, so that the stability of the whole structure is affected, and the test result shows that the using number of the organic glass gaskets 8 is not more than 1 on one embedded steel plate 3.
The adoption of the technical scheme ensures that the levelness is adjusted simply and conveniently.
Fifth embodiment:
the method for leveling and adjusting the levelness of the flange on the transition section of the mixing tower according to the embodiments shown in fig. 1, 2 and 4 is different from the first embodiment in that: the transition section concrete tower barrel 2 is of a horn shape with a small upper part and a large lower part, an embedded annular steel plate 1 is arranged at the upper edge opening of the transition section concrete tower barrel, and the transition section concrete tower barrel is formed by pouring by an inversion method.
In actual use, the transition section concrete tower 2 is poured by adopting an inversion method. The inversion method is a method that pouring is performed, the lower edge opening of the transition section concrete tower 2 faces upwards, and the upper edge opening faces downwards.
The embedded annular steel plate 1 is embedded in the upper edge opening of the conversion section steel tower cylinder 6, and steel strand pore canals are uniformly arranged in the annular direction; a plurality of tie bars which are uniformly distributed are vertically and fixedly connected on the inner side surface of the embedded annular steel plate 1. When the transition section concrete tower drum 2 is manufactured, the pre-buried annular steel plate 1 is firstly installed and leveled on a prefabricated field. When the embedded annular steel plate 1 is installed, the inner side of the embedded annular steel plate faces upwards, and the outer side of the embedded annular steel plate faces downwards, namely one side provided with tie bars faces upwards; leveling is to measure the outer side surface of the embedded annular steel plate 1 by using a level gauge, and a point is measured every 45 degrees during measurement, so that the levelness of the embedded annular steel plate meets the requirements.
Example six:
according to the leveling and adjusting method for the flange levelness on the transition section of the mixing tower shown in fig. 1, 2 and 4, the difference from the first embodiment or the fifth embodiment is that: the pouring and hoisting method of the transition section concrete tower barrel 2 comprises the following steps:
s1: installing and leveling the embedded annular steel plate 1 on a prefabricated field;
s2: mounting inner form
When the inner template is installed, the mode that the upper opening faces downwards and the lower opening faces upwards is adopted for installation;
s3: binding steel bars at the outer side of the inner template, and reserving steel strand pore canals;
s4: two sleeves are embedded symmetrically on the side wall of the inner template;
the sleeve is pre-embedded at 1/2 of the side wall of the transition section concrete tower barrel 2;
s5: closing an outer side template, and pouring a conversion section tower barrel;
s6: s5, after the completion of the step S, removing the template;
s7: connecting a threaded rod in each embedded sleeve, and hanging a steel wire rope on the threaded rod;
s8: hoisting transition section concrete tower 2
The poured transition section concrete tower 2 is lifted by a steel wire rope, and in the lifting process, the transition section concrete tower 2 automatically turns over due to the lowering of the gravity center, namely, the small opening faces upwards and the large opening faces downwards; and hoisting the turned transition section concrete tower barrel 2 to the middle section concrete tower barrel 4.
When the method is used in practice, after the transition section concrete tower 2 is manufactured by adopting the method, the levelness of the embedded annular steel plate 1 can be ensured, and the installation of the subsequent fan tower is facilitated.
Embodiment seven:
according to the leveling and adjusting method for the flange levelness on the conversion section of the mixing tower shown in fig. 1, the first difference from the embodiment is that: in the fifth step, the outer ring 10 and the inner ring 12 of the upper flange 5 of the conversion section steel tower 6 are respectively arranged 5cm away from the outer edge and the inner edge; the middle ring 11 is located between the outer ring 10 and the inner ring 12 at the same distance from the outer ring 10 and the inner ring 12.
In actual use, the outer ring 10, the middle ring 11 and the inner ring 12 are arranged on the upper flange plate 5 to serve as measuring rings, so that the accuracy of measuring and adjusting the levelness of the upper flange is high.
Example eight:
the leveling and adjusting method for flange levelness on the transition section of the mixing tower according to the embodiments shown in fig. 1, 4 and 7 is different from the first embodiment or the seventh embodiment in that: the leveling methods of the outer ring 10, the middle ring 11 and the inner ring 12 are the same; the leveling method of the outer ring 10 is to measure one datum at every 45 degrees on the ring line of the outer ring 10, and obtain 8 points of levelness deviation values in total, wherein the deviation between every two levelness deviation values of 8 points is not more than 3mm.
In actual use, if the deviation between levelness deviation values of 8 points exceeds 3mm, the steel strands near the points with larger deviation can be leveled by adopting a method with larger tension value during pretensioning by adopting 15% -25% of the tension of the design value.
When in actual use, the technical scheme is adopted for leveling the levelness of the upper flange, so that the levelness precision after measurement and adjustment is higher, and the safety and stability of the installed fan tower are better.
Example nine:
according to the leveling and adjusting method for the flange levelness on the conversion section of the mixing tower shown in fig. 1, the first difference from the embodiment is that: and step six, when the prestressed steel strand is tensioned and pre-tensioned, the pre-tensioning force value is 15-25% of the total tensioning force.
When in actual use, the technical scheme is adopted for tensioning and pre-tightening the pre-stressed steel strand, and effective reference data can be given to the follow-up formal tensioning adjustment value.
Example ten:
according to the leveling and adjusting method for the flange levelness on the conversion section of the mixing tower shown in fig. 1, the first difference from the embodiment is that: the seventh stretching steel strand is stretched in a cross symmetry stretching mode, namely, the first group stretches in the directions of 0 degrees and 180 degrees, the second group stretches in the directions of 90 degrees and 270 degrees, and the like until stretching of all the steel strands is completed.
When in actual use, the biggest benefit of tensioning by adopting the cross symmetrical tensioning mode is that the adverse effects of uneven stress of individual steel bundles, structural deformation caused by uneven stress, steel bundle wire breakage and the like are effectively prevented, and further, individual deviation points can be adjusted through real-time measurement in the tensioning process, so that the operation requirement is finally met.
Under the condition of no conflict, the technical features related to the examples can be combined with each other according to actual situations by a person skilled in the art so as to achieve corresponding technical effects, and specific details of the combination situations are not described in detail herein.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
While the invention is susceptible of embodiments in accordance with the preferred embodiments, the invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (9)
1. A leveling and adjusting method for flange levelness on a mixing tower barrel conversion section is characterized by comprising the following steps of: comprises the following steps of the method,
step one: hoisting middle section concrete tower (4)
After the middle section concrete tower (4) is hoisted, measuring levelness difference values of different points on the middle section concrete tower;
step two: hoisting transition section concrete tower (2)
Hoisting the transition section concrete tower (2) to the upper opening of the middle section concrete tower (4), measuring the levelness deviation of the embedded annular steel plate (1) on the transition section concrete tower (2), leveling if the levelness deviation is larger than a preset value, and entering the third step if the levelness deviation is smaller than or equal to the preset value;
step three: setting slurry at the upper edge of the middle section concrete tower (4);
step four: hoisting conversion section steel tower (6)
Hoisting the transition section steel tower cylinder (6) to the upper opening of the transition section concrete tower cylinder (2);
step five: measuring levelness of upper flange (5) of conversion section steel tower barrel (6)
Measuring levelness of an outer ring (10), an intermediate ring (11) and an inner ring (12) of an upper flange plate (5) of the conversion section steel tower cylinder (6), leveling if the levelness of the outer ring (10), the intermediate ring (11) and the inner ring (12) deviate from each other by more than a preset value, until the levelness of the outer ring (10), the intermediate ring (11) and the inner ring (12) deviate from each other by less than the preset value, and entering a step six;
step six: tensioning and pre-tightening the pre-stressed steel strand, and repeating the fifth step;
step seven: tensioning steel strand
In the tensioning process of the steel strand, the levelness of the upper flange plate (5) is monitored in real time, if the levelness of the upper flange plate (5) is larger than a preset value, adjustment is carried out, and after tensioning is finished, the levelness of the upper flange plate (5) is finally measured once;
the embedded annular steel plate (1) is embedded in the upper edge opening of the steel tower cylinder (6) of the conversion section, and steel strand pore canals are uniformly arranged in the annular direction; a plurality of tie bars which are uniformly distributed are vertically and fixedly connected to the inner side surface of the embedded annular steel plate (1);
the seventh stretching steel strand is stretched in a cross symmetry stretching mode, namely, the first group stretches in the directions of 0 degrees and 180 degrees, the second group stretches in the directions of 90 degrees and 270 degrees, and the like until stretching of all the steel strands is completed.
2. The method for leveling and adjusting the levelness of the flange on the transition section of the mixing tower according to claim 1, wherein the method comprises the following steps: the middle section concrete tower (4) is horn-shaped, and the surface flatness deviation of the concrete at the lower edge opening is within 2 mm; a plurality of through steel strand pore canals are uniformly and vertically arranged on the side wall of the middle section concrete tower barrel (4); 6 pre-buried steel plates (3) are uniformly buried on the surface of the upper edge opening, the 6 pre-buried steel plates (3) and a plurality of steel strand pore channels are arranged in a staggered mode, and the flatness deviation of the upper surface of the 6 pre-buried steel plates (3) is within 2mm.
3. The method for leveling and adjusting the levelness of the flange on the transition section of the mixing tower according to claim 1, wherein the method comprises the following steps: and in the second step, the preset value of the levelness deviation of the embedded annular steel plate (1) is 2mm.
4. A method for leveling and adjusting the levelness of a flange on a transition section of a mixing tower as claimed in claim 1 or 3, wherein: the leveling method is that a gasket is placed on the embedded steel plate (3) of the middle section concrete tower barrel (4) for adjustment when the levelness deviation of the embedded annular steel plate (1) is larger than a preset value; the gaskets comprise a circular organic glass gasket (8) with the thickness of 3mm and a circular steel gasket (9) with the thickness of 1 mm; when in leveling use, one or the combination of an organic glass gasket (8) and a 1mm thick steel gasket (9) is adopted; the use number of the organic glass gaskets (8) in combination is not more than 1 on one embedded steel plate (3).
5. The method for leveling and adjusting the levelness of the flange on the transition section of the mixing tower according to claim 1, wherein the method comprises the following steps: the transition section concrete tower cylinder (2) is a horn type with a small upper part and a large lower part, an embedded annular steel plate (1) is arranged at the upper edge opening of the transition section concrete tower cylinder, and the transition section concrete tower cylinder is formed by pouring by an inversion method.
6. A method for leveling and adjusting the levelness of a flange on a transition section of a mixing tower as claimed in claim 1 or 5, wherein: the pouring and hoisting method of the transition section concrete tower (2) comprises the following steps:
s1: installing and leveling the embedded annular steel plate (1) on a prefabricated field;
s2: installing an inner template;
when the inner template is installed, the mode that the upper opening faces downwards and the lower opening faces upwards is adopted for installation;
s3: binding steel bars at the outer side of the inner template, and reserving steel strand pore canals;
s4: two sleeves are embedded symmetrically on the side wall of the inner template;
the sleeve is pre-embedded at 1/2 of the side wall of the transition section concrete tower barrel (2);
s5: closing an outer side template, and pouring a conversion section tower barrel;
s6: s5, after the completion of the step S, removing the template;
s7: connecting a threaded rod in each embedded sleeve, and hanging a steel wire rope on the threaded rod;
s8: concrete tower of lifting transition section (2)
The poured transition section concrete tower (2) is lifted through a steel wire rope, and in the lifting process, the transition section concrete tower (2) is automatically turned over due to the fact that the center of gravity is lowered, namely, the small opening is upward, and the large opening is downward; and hoisting the turned transition section concrete tower barrel (2) to the middle section concrete tower barrel (4).
7. The method for leveling and adjusting the levelness of the flange on the transition section of the mixing tower according to claim 1, wherein the method comprises the following steps: an outer ring (10) and an inner ring (12) of an upper flange plate (5) of the steel tower barrel (6) of the conversion section in the fifth step are respectively arranged 5cm away from the outer edge and the inner edge; the middle ring (11) is positioned between the outer ring (10) and the inner ring (12) and is equidistant from the outer ring (10) and the inner ring (12).
8. A method for leveling and adjusting the levelness of a flange on a transition section of a mixing tower as set forth in claim 1 or 7, wherein: the leveling methods of the outer ring (10), the middle ring (11) and the inner ring (12) are the same; the leveling method of the outer ring (10) is to measure one datum at every 45 degrees on the ring line of the outer ring (10) to obtain 8 points of levelness deviation values, wherein the deviation between every two levelness deviation values of the 8 points is not more than 3mm.
9. The method for leveling and adjusting the levelness of the flange on the transition section of the mixing tower according to claim 1, wherein the method comprises the following steps: and step six, when the prestressed steel strand is tensioned and pre-tensioned, the pre-tensioning force value is 15-25% of the total tensioning force.
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