CN114837896A - Segmented prefabricated transition section shell ring for wind power tower with steel-concrete structure - Google Patents
Segmented prefabricated transition section shell ring for wind power tower with steel-concrete structure Download PDFInfo
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- CN114837896A CN114837896A CN202110141367.5A CN202110141367A CN114837896A CN 114837896 A CN114837896 A CN 114837896A CN 202110141367 A CN202110141367 A CN 202110141367A CN 114837896 A CN114837896 A CN 114837896A
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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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Abstract
The invention relates to a segmented prefabricated transition section cylindrical section for a wind power tower with a steel-concrete structure, which comprises ring pieces and a ring piece connecting plate (3), wherein the two ring pieces are spliced and enclosed to form a hollow round table shape and comprise concrete ring pieces (1) and steel ring pieces (2); a plurality of steel strand ducts (11) are arranged in the side wall of the concrete ring piece along the circumferential direction, and each steel strand duct is parallel to the direction of the circular truncated cone bus and penetrates through the side wall of the concrete ring piece; the top of the steel ring piece is provided with a flange (21), and the flange is provided with a plurality of first screw holes (22); a plurality of circles of stiffening ribs (24) are fixedly arranged on the inner wall of the steel ring sheet along the horizontal direction; a plurality of third screw holes are formed in the outer wall of the steel ring piece close to the vertical splicing seams; the length of the ring piece connecting plate is matched with the degree of the steel ring piece, and two vertical rows of fourth screw holes are formed in the ring piece connecting plate and correspond to the third screw holes respectively. The invention has simple and reliable structure, solves the problem of unmatched precision when the concrete structure and the steel structure are connected, and can reduce the cost.
Description
Technical Field
The invention relates to a wind power tower cylinder with a steel-concrete structure, in particular to a segmented prefabricated transition section cylinder section for the wind power tower cylinder with the steel-concrete structure.
Background
Wind power generation is gradually developed towards inland areas as a clean energy technology, and because the wind speed of the inland areas is low, and meanwhile, the power of the wind generating set is increased day by day, the diameter of a wind wheel is continuously increased, the height of a tower barrel is also continuously increased, and the height of the tower barrel of the wind generating set on the road at present can reach 120-160 m. If the wind power tower barrel is completely made of steel tower barrels with lower rigidity, the tower barrel is easy to resonate and damage. Wind power towers of a reinforced concrete (steel-concrete) structure are widely used, the concrete tower drum is adopted at the lower part of the drum body, the steel tower drum is adopted at the upper part of the drum body, and the reinforced concrete structure can effectively improve the rigidity of the tower drum and prevent the tower drum from generating resonance. The concrete tower drum is prefabricated in sections and fragments, namely, the tower drum is divided into a plurality of drum sections along the height direction, the drum sections are divided into a plurality of ring sections along the circumferential direction, the ring sections are transported to the site for assembly after being prefabricated in a factory, the concrete tower drum is integrally hoisted after the assembly is completed, and steel strands are adopted to apply prestress to the concrete tower drum after the hoisting is completed, so that the concrete tower drum forms a whole.
Generally, the highest section of a concrete tower drum is used as a transition section of a concrete tower drum, and the top of the section of the concrete tower drum needs to be directly connected with a flange at the bottom of a steel tower drum, so that the stress condition is complex. Chinese patent 202010399351.X discloses a segment prefabricated assembled combined tower tube connection node and its installation method, and this patent has solved the overweight and super wide transportation problem of shell ring, but has several problems as follows:
1. nearly hundred prestressing steel and tens prestressing force buries the piece in the connected node (as the changeover portion shell ring), and prestressing steel is equivalent to the buried anchor, and prestressing force buries the piece and is equivalent to steel strand wires embedded pipe, and this connected node still includes other parts such as upper and lower flange in addition for manufacturing process is complicated, manufacturing time is long, must still rely on special frock to fix a position crab-bolt and upper and lower flange simultaneously.
2. Need vibrate closely during concrete placement, easily cause the drift bolt to shift, the shell ring fragmentation is assembled and also can be caused the actual position of drift bolt and produce great error with the design simultaneously, and steel tower bobbin base portion flange obtains through precision manufacturing, and its bolt hole position error is very little, consequently in actual engineering very easily takes place steel tower bobbin base portion flange and can't cooperate with the drift bolt smoothly, need return the steel tower section of thick bamboo factory to expand the bolt hole on the flange, delay time limit for a project and increase cost.
3. Based on the consideration of fatigue performance, the embedded anchor bolts are long anchor bolts of 1-2 m, and the corresponding material cost is higher. Meanwhile, in the running process of the fan, if some embedded anchor bolts are damaged due to fatigue and other reasons, the fan and the steel tower cylinder can only be completely disassembled after the embedded anchor bolts cannot be independently replaced on line, and the steel tower cylinder and the fan are hoisted after the connecting nodes are replaced, so that the maintenance time and the maintenance cost are greatly increased.
Disclosure of Invention
The invention aims to provide a segmented prefabricated transition section shell ring for a wind power tower cylinder with a reinforced concrete structure.
The invention is realized by the following steps:
a segmented prefabricated transition section cylindrical shell section for a wind power tower cylinder with a steel-concrete structure comprises ring pieces and ring piece connecting plates, wherein the two same ring pieces are spliced and enclosed to form a hollow round platform shape;
a plurality of steel strand ducts are arranged in the side wall of the concrete ring piece along the circumferential direction, and each steel strand duct is parallel to the direction of the circular truncated cone bus and penetrates through the side wall of the concrete ring piece;
the top of each steel ring piece is provided with a flange, a plurality of first screw holes are formed in the flange, a flange connecting plate is arranged at the splicing position of the two steel ring pieces on the flange, and a second screw hole is formed in the flange connecting plate; a plurality of circles of stiffening ribs are fixedly arranged on the inner wall of the steel ring piece along the horizontal direction, the stiffening rib at the highest axial position is arranged on the top surface of the concrete ring piece, the stiffening rib at the lowest axial position is arranged on the bottom surface of the concrete ring piece, and the other stiffening ribs are embedded in the side wall of the concrete ring piece; a plurality of third screw holes are formed in the outer wall of the steel ring piece close to the vertical splicing seams;
the length of the ring piece connecting plate is matched with the height of the steel ring piece, and two vertical rows of fourth screw holes are formed in the ring piece connecting plate and correspond to the third screw holes respectively.
The concrete ring piece is provided with a key groove at the vertical splicing surface, the key groove extends along the splicing surface, and a grouting groove is formed between the top of the key groove and the top surface of the concrete ring piece.
A plurality of U-shaped steel bars are vertically arranged in the key groove, and the height of the U-shaped steel bars extending out of the vertical splicing surfaces is smaller than the depth of the key groove.
The opening area of the key groove is gradually reduced from the opening of the key groove to the bottom surface of the key groove.
The inner wall of the lower end of the concrete ring piece is provided with a conical surface, the conical surface is positioned below the bottom of the key groove, and the lower end opening of the steel strand pore channel is arranged on the conical surface.
The steel strand pore canals are uniformly distributed along the circumferential direction or are uniformly distributed in groups.
The plurality of stiffening ribs are uniformly arranged along the vertical direction.
The stiffening ribs are annular steel plates.
The diameter of the steel strand pore channel is 1.5-2 times of the diameter of the steel strand.
According to the segmented prefabricated transition section cylindrical section for the wind power tower cylinder with the steel-concrete structure, firstly, only the steel strand pore channel is arranged on the concrete ring piece, and an anchor bolt does not need to be embedded, so that the manufacturing process of the concrete ring piece is simplified, and the manufacturing process requirement is lowered. Secondly, set up the screw on the steel ring piece flange, like steel tower bobbin bottom flange, accomplish by mill's precision manufacturing, both can carry out good adaptation in the precision to the unmatched problem of precision when concrete structure and steel construction are connected has been solved. Moreover, steel ring piece and steel tower section of thick bamboo are connected and are used the bolt for detachable construction, and not only bolt length can reduce greatly, helps reducing material cost, has the bolt damage of individuality moreover in fan operation process, only need change the damage the bolt can, help reducing fortune dimension cost. In addition, the diameter of the steel strand pore channel is set to be 1.5-2 times of that of the steel strand, so that the steel strand pore channel of the transition section shell ring can be matched with the reserved steel strand pore channel on the basis of the wind power tower cylinder in a good precision manner when the steel strand is tensioned.
Compared with the prior art, the invention has the following beneficial effects: the transition section shell ring structure is succinct reliable, and the unmatched problem of precision when effectively having solved concrete structure and steel construction and being connected to material cost, manufacturing cost and fortune dimension cost have been reduced.
Drawings
FIG. 1 is a schematic perspective view of a segmented prefabricated transition section shell ring for a reinforced concrete structure wind power tower cylinder;
FIG. 2 is a schematic top view of the steel strand pulling apparatus according to the present invention;
FIG. 3 is a schematic view of the internal structure of the ring plate of the present invention;
fig. 4 is a schematic axial sectional structure of the ring plate of the present invention.
In the figure, 1 concrete ring piece, 11 steel strand pore canals, 12 key grooves, 13 grouting grooves, 14U-shaped steel bars, 15 grouting holes, 16 anchor backing plates, 17 conical surfaces, 2 steel ring pieces, 21 flanges, 22 first screw holes, 23 flange connecting plates, 24 stiffening ribs, 25 second screw holes, 3 ring piece connecting plates and 31 bolts.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1 and 2, the segmented prefabricated transition section cylindrical shell section for the wind power tower cylinder with the steel-concrete structure comprises ring pieces and a ring piece connecting plate 3, wherein two identical ring pieces are spliced and enclosed to form a hollow circular truncated cone shape. The ring piece includes concrete ring piece 1 and steel ring piece 2, and the laminating of steel ring piece 2 is on 1 lateral surface of concrete ring piece, and 1 bottom surface of concrete ring piece and 2 bottom surfaces of steel ring piece flush, and 2 highly are greater than 1 height of concrete ring piece of steel ring piece.
Referring to fig. 3 and 4, a plurality of steel strand ducts 11 are arranged in the side wall of the concrete ring piece 1 along the circumferential direction, each steel strand duct 11 is arranged in parallel to the direction of the circular truncated cone bus and penetrates through the side wall of the concrete ring piece 1, and the plurality of steel strand ducts 11 are uniformly distributed or grouped and uniformly distributed along the circumferential direction. The diameter of the steel strand pore canal 11 is 1.5-2 times of the diameter of the steel strand. When the steel strand is threaded, the upper end of the steel strand penetrates out of the steel strand pore passage and is anchored on the top surface of the concrete ring piece 1 through the anchor backing plate 15, as shown in fig. 2. Concrete ring 1 sets up keyway 12 in vertical concatenation face department, and keyway 12 extends along the concatenation face, sets up grout groove 13 between keyway 12 top and the 1 top surface of concrete ring, and grout groove 13 of two concrete rings 1 forms grout hole 15 after the concatenation, and grout hole 15 is preferred circular. A plurality of U-shaped reinforcing steel bars 14 are vertically arranged in the key groove 12, and the height of the U-shaped reinforcing steel bars 14 extending out of the vertical splicing surface is smaller than the depth of the key groove 12. The opening area of the key groove 12 is gradually reduced from the opening of the key groove 12 to the bottom surface of the key groove 12.
The inner wall of the lower end of the concrete ring piece 1 is provided with a conical surface 17, the conical surface 17 is positioned below the bottom of the key groove 12, and the lower end opening of the steel strand hole 11 is arranged on the conical surface 17. The top surface wall thickness of concrete ring piece 1 is greater than the bottom surface wall thickness of concrete ring piece 1, and conical surface 17 makes the lower extreme wall thickness of concrete ring piece 1 gradually transition to the bottom surface wall thickness from the top surface wall thickness. The lower end opening of the concrete steel strand duct 11 is arranged on the conical surface 17, namely the steel strand duct 11 is arranged close to the inner side wall of the concrete ring plate 1. The wall thickness of the transition section shell section needs to be anchored with the steel strand, the wall thickness of the transition section shell section is generally thicker, the wall thickness of the concrete tower shell section below the transition section shell section needs to be smaller than that of the transition section shell section, meanwhile, the steel strand needs to be located on the inner side of the concrete tower shell section, the wall thickness of the transition section shell section can be gradually transited to the wall thickness of the concrete tower shell section through the conical surface structure, rigidity mutation is avoided, and a good stress effect is guaranteed.
The top of steel ring piece 2 sets up flange 21, sets up a plurality of first screw 22 on the flange 21 for carry out bolted connection with the steel tower section of thick bamboo of top. Flange 21 sets up flange joint board 23 in two steel ring piece 2 concatenation departments, sets up second screw 25 on the flange joint board 23, and first screw 22 of two steel ring piece 2 in the concatenation department is aimed at to second screw 25, and first screw 22 and second screw 25 pass through bolt and nut fixed connection.
A plurality of circles of stiffening ribs 24 are fixedly arranged on the inner wall of the steel ring piece 2 along the horizontal direction, and the steel ring piece 2 is connected with the concrete ring piece 1 through the stiffening ribs 24. Preferably, the stiffening ribs 24 are annular steel plates and are fixed to the inner wall of the steel ring plate 2 by double fillet welds. The stiffening rib 24 of the highest position of axial sets up on the top surface of concrete ring 1, and the stiffening rib 24 of the lowest position of axial sets up on the bottom surface of concrete ring 1, and remaining stiffening rib 24 imbeds on concrete ring 1 lateral wall for concrete ring 1 and steel ring 2 are firm to be connected and as an integral atress. Preferably, the plurality of stiffeners 24 are uniformly arranged in the vertical direction.
The outer wall of the steel ring piece 2 is provided with a plurality of third screw holes close to the vertical splicing seams, and preferably, the third screw holes are uniformly arranged along the vertical splicing seams. Referring to fig. 1, the length of the ring connecting plate 3 is adapted to the height of the steel ring 2, two rows of fourth screw holes are vertically arranged on the ring connecting plate 3 and respectively correspond to the third screw holes, and the third screw holes and the fourth screw holes are fixedly connected through bolts 31 and nuts.
Preferably, in the size setting of the transition section shell ring, the outer diameter of the top surface of the transition section shell ring is 3-6 m, the maximum value of the outer diameter of the bottom surface of the transition section shell ring can be 7m, the height of the concrete ring is 1.0-2.5 m, the height of the steel ring is 1.0-2.0 m more than that of the concrete ring, the wall thickness of the top surface of the concrete ring is 500-800 mm, and the wall thickness of the bottom surface of the concrete ring is 250-350 mm. The number of the steel strand pore channels is 12-36. The radius of the grouting hole is 5-10 cm, and the depth of the grouting hole is 20-50 cm. The opening length of keyway is 0.8~2.0m, and the opening width of keyway is 300~400mm, and the bottom surface length of keyway is less than opening length 0.1m, and the bottom surface width of keyway is less than the opening width of keyway 100mm, and the degree of depth of keyway is 0.2~0.6 m. The distance between adjacent U-shaped reinforcing bars is 100-200 mm. The wall thickness of the steel ring sheet is 15-40 mm, the length of the stiffening ribs in the radial direction is 150-400 mm, the thickness of the stiffening ribs is 10-30 mm, and the distance between every two adjacent stiffening ribs in the axial direction is about 50 cm.
In this embodiment, the height of concrete ring piece is 2.0m, and the steel ring piece height is 3.2m, and the top surface thickness of concrete ring piece is 600mm, and the bottom surface thickness of concrete ring piece is 300 mm. The number of the steel strand pore canals is 16, the steel strand pore canals are uniformly distributed in groups along the circumferential direction, and the diameter of each steel strand pore canal is 180 mm. The diameter of the grouting hole is 5cm, and the depth of the grouting hole is 25 cm. The opening length of the key groove is 1.5m, the opening width is 350mm, the bottom surface length is 1.4m, the bottom surface width is 250mm, and the depth is 0.25 m. The interval of U-shaped reinforcing bar is 150mm, and the height that U-shaped reinforcing bar stretches out vertical concatenation face is 0.2 m. The wall thickness of steel ring piece is 25mm, and screw quantity is 100. The length of the stiffener in the radial direction was 200mm, and the plate thickness of the stiffener was 20 mm. The distance between the adjacent third screw holes is about 100 mm.
In the construction process, the ring sheets are transported to the site and then assembled on a special assembly platform, and after the preliminary assembly is finished, high-strength grouting material is poured into the key slot from the grouting hole and is vibrated to be dense; then, aligning the fourth screw hole of the ring connecting plate with the third screw holes on the two ring pieces and connecting the fourth screw holes and the third screw holes through bolts; then, hoisting the transition section cylindrical shell to the top of the concrete tower barrel, and performing steel strand threading and tensioning; and after all the steel strands are tensioned, hoisting the steel tower cylinder, aligning anchor bolt holes in a flange at the bottom of the steel tower cylinder with screw holes in a steel ring flange, stacking a flange connecting plate at the splicing position of the flange, inserting bolts, applying prestress according to requirements, and screwing nuts.
According to the segmented prefabricated transition section barrel section for the wind power tower barrel with the steel-concrete structure, the problem of precision matching when the concrete tower barrel and the steel tower barrel are connected is well solved through the combined structure of the concrete ring piece and the steel ring piece, meanwhile, anchor bolts do not need to be embedded in the concrete ring piece, only damaged bolts need to be replaced in the operation and maintenance process, and positive contribution can be made to reduction of material cost, manufacturing cost and operation and maintenance cost.
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 (9)
1. The utility model provides a prefabricated formula changeover portion shell ring of subdivision for reinforced concrete structure wind power tower cylinder which characterized in that: the concrete ring piece structure comprises ring pieces and a ring piece connecting plate (3), wherein the two same ring pieces are spliced and enclosed to form a hollow round table shape, each ring piece comprises a concrete ring piece (1) and a steel ring piece (2), the steel ring pieces (2) are attached to the outer side surfaces of the concrete ring pieces (1), the bottom surfaces of the concrete ring pieces (1) and the steel ring pieces (2) are flush, and the height of each steel ring piece (2) is greater than that of the concrete ring piece (1);
a plurality of steel strand pore channels (11) are arranged in the side wall of the concrete ring piece (1) along the circumferential direction, and each steel strand pore channel (11) is parallel to the direction of the circular truncated cone bus and penetrates through the side wall of the concrete ring piece (1);
a flange (21) is arranged at the top of each steel ring piece (2), a plurality of first screw holes (22) are formed in each flange (21), a flange connecting plate (23) is arranged at the joint of the two steel ring pieces (2) of each flange (21), and a second screw hole (25) is formed in each flange connecting plate (23); a plurality of circles of stiffening ribs (24) are fixedly arranged on the inner wall of the steel ring piece (2) along the horizontal direction, the stiffening rib (24) at the highest axial position is arranged on the top surface of the concrete ring piece (1), the stiffening rib (24) at the lowest axial position is arranged on the bottom surface of the concrete ring piece (1), and the rest stiffening ribs (24) are embedded in the side wall of the concrete ring piece (1); a plurality of third screw holes are formed in the outer wall of the steel ring piece (2) close to the vertical splicing seams;
the length of the ring piece connecting plate (3) is matched with the height of the steel ring piece (2), and two vertical rows of fourth screw holes are formed in the ring piece connecting plate (3) and correspond to the third screw holes respectively.
2. The segmented prefabricated transition section shell section for the steel-concrete structure wind power tower cylinder according to claim 1, wherein: concrete ring piece (1) sets up keyway (12) in vertical concatenation face department, and keyway (12) extend along the concatenation face, sets up grout groove (13) between keyway (12) top and concrete ring piece (1) top surface.
3. The segmented prefabricated transition section shell section for the steel-concrete structure wind power tower cylinder as claimed in claim 2, wherein: a plurality of U-shaped reinforcing steel bars (14) are vertically arranged in the key groove (12), and the height of the U-shaped reinforcing steel bars (14) extending out of the vertical splicing surface is smaller than the depth of the key groove (12).
4. The segmented prefabricated transition section shell section for the steel-concrete structure wind power tower cylinder as claimed in claim 2, wherein: the opening area of the key groove (12) is gradually reduced from the opening of the key groove (12) to the bottom surface of the key groove (12).
5. The segmented prefabricated transition section shell section for the steel-concrete structure wind power tower cylinder according to claim 1, wherein: the concrete ring piece is characterized in that a conical surface (17) is arranged on the inner wall of the lower end of the concrete ring piece (1), the conical surface (17) is located below the bottom of the key groove (12), and an opening at the lower end of the steel strand hole (11) is formed in the conical surface (17).
6. The segmented prefabricated transition section shell section for the steel-concrete structure wind power tower cylinder according to claim 1, wherein: the steel strand pore canals (11) are uniformly distributed along the circumferential direction or are uniformly distributed in groups.
7. The segmented prefabricated transition section shell section for the steel-concrete structure wind power tower cylinder according to claim 1, wherein: the plurality of stiffening ribs (24) are uniformly arranged along the vertical direction.
8. The segmented prefabricated transition section shell section for the steel-concrete structure wind power tower cylinder according to claim 1, wherein: the stiffening ribs (24) are annular steel plates.
9. The segmented prefabricated transition section shell section for the steel-concrete structure wind power tower cylinder according to claim 1, wherein: the diameter of the steel strand pore channel (11) is 1.5-2 times of that of the steel strand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110141367.5A CN114837896A (en) | 2021-02-02 | 2021-02-02 | Segmented prefabricated transition section shell ring for wind power tower with steel-concrete structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110141367.5A CN114837896A (en) | 2021-02-02 | 2021-02-02 | Segmented prefabricated transition section shell ring for wind power tower with steel-concrete structure |
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| Publication Number | Publication Date |
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| CN114837896A true CN114837896A (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110141367.5A Pending CN114837896A (en) | 2021-02-02 | 2021-02-02 | Segmented prefabricated transition section shell ring for wind power tower with steel-concrete structure |
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| CN (1) | CN114837896A (en) |
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2021
- 2021-02-02 CN CN202110141367.5A patent/CN114837896A/en active Pending
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