CN114939919B - Reverse pouring construction method for concrete tower barrel transition section shell ring - Google Patents
Reverse pouring construction method for concrete tower barrel transition section shell ring Download PDFInfo
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- CN114939919B CN114939919B CN202210311421.0A CN202210311421A CN114939919B CN 114939919 B CN114939919 B CN 114939919B CN 202210311421 A CN202210311421 A CN 202210311421A CN 114939919 B CN114939919 B CN 114939919B
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- 230000007704 transition Effects 0.000 title claims abstract description 64
- 238000010276 construction Methods 0.000 title claims abstract description 41
- 230000002787 reinforcement Effects 0.000 claims abstract description 12
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 2
- 235000017491 Bambusa tulda Nutrition 0.000 claims 2
- 241001330002 Bambuseae Species 0.000 claims 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 2
- 239000011425 bamboo Substances 0.000 claims 2
- 238000000034 method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/0056—Means for inserting the elements into the mould or supporting them in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
- B28B7/0014—Fastening means for mould parts, e.g. for attaching mould walls on mould tables; Mould clamps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
- Foundations (AREA)
Abstract
The invention discloses a reverse pouring construction method for a concrete tower transition section shell ring, which comprises the following steps: placing the bottom die (5) on the ground and leveling; erecting an inner mold (6) on the bottom mold; an upper flange (2) is erected on the bottom die, and through holes which are matched with the embedded anchor bolts (4) of the transition section shell ring (1) in number and position are formed in the upper flange; the top of the embedded anchor bolt is screwed with an embedded anchor bolt positioning nut (7), and the embedded anchor bolt is inserted into a through hole of the bottom die top plate (51) after passing through the upper flange through hole; a lower flange positioning nut (8) is screwed into the bottom of the embedded anchor bolt, then the lower flange (3) is inserted into the bottom of the embedded anchor bolt, and a stress nut (9) of the embedded anchor bolt is screwed into the bottom end; hanging the reinforcement cage on the bottom die by a crane; welding and fixing the lower flange and the peripheral reinforcement cage by using reinforcement bars in the circumferential direction of the lower flange; erecting an outer die (10) on the bottom die, and fixing an upper flange on the outer die by bolts (11); and erecting side molds at two sides on the bottom mold.
Description
Technical Field
The invention relates to a concrete wind generating set tower, in particular to a reverse pouring construction method for a concrete tower transition section shell ring.
Background
Wind power generation is used as a clean energy technology, and is widely applied to northeast, north China and northwest regions (namely 'three north' regions) with better wind resources in China. As the development of the "three north" region becomes saturated, wind power generation is evolving toward the inland region. Because the wind speed in inland areas is lower, and meanwhile, the power of the wind generating set is increasingly increased, so that the diameter of a wind wheel is increasingly larger, the height of a tower barrel is also increasingly higher, and the height of the tower barrel of the current inland wind generating set reaches 120-160 m.
With the increase of the tower, the rigidity of the traditional steel tower is lower, and the steel tower is easy to resonate and damage. At present, a novel steel-concrete mixing tower barrel structure system is deeply researched and widely applied. The lower part of the tower barrel structure system adopts a concrete tower barrel, the upper part adopts a steel tower barrel, and the ratio of the height of the steel tower barrel to the height of the concrete tower barrel is determined by the frequency and the economical efficiency. The tower structure system can effectively improve the rigidity of the whole tower and ensure that the whole tower is prevented from generating resonance.
The concrete tower is generally prefabricated in a segmented and piecewise manner, and then transported to the site for assembly and hoisting. The method comprises the steps of dividing the tower into a plurality of cylindrical sections along the height direction of the tower, transporting the tower to the site after being prefabricated in a factory, splicing the tower sections on a special splicing platform, hoisting the whole section after splicing, and pre-stressing the whole concrete tower section after hoisting is completed, so that the whole concrete tower section is formed into a whole.
The transition section shell ring is a ring at the highest part of the concrete tower, the upper part of the transition section shell ring is directly connected with the steel tower, and the stress of the transition section shell ring is complex. The prior transition section, such as the Chinese patent 202010399251. X, discloses a connecting node of a split prefabricated assembled combined tower and an installation method thereof, and the transition section constructed according to the installation method has the following problems: 1. the whole transition section shell ring is internally provided with nearly hundred embedded bolts, when the transition section is poured, the transition section shell ring is generally fixed on an upper flange, and then the embedded bolts are fixed by a method of positioning the upper flange through a fixture. By adopting the form of split prefabrication, the upper flange is divided into two semi-annular flanges, and compared with the whole annular flange, the semi-annular flange has the advantages that the rigidity is greatly reduced, and the radial dimension of the semi-annular flange has larger deviation. In addition, a vibrating chamber is needed during concrete pouring, so that the position of the embedded anchor bolt is easy to move; in addition, because errors are generated when the two semi-annular sheets are assembled, larger errors are generated in the actual positions and the designs of the embedded anchors after the assembly is completed. The flange of the upper steel tower cylinder is precisely manufactured in a factory, and the position error is small. In actual construction engineering, the flange of the steel tower can not be smoothly sleeved into the embedded bolts, and bolt holes of the flange are required to be enlarged when the steel tower returns to a factory. 2. Because the frock is when fixed the upper flange, generally only in circumference fixed several positions, the upper flange partially can concave and lead to its planarization relatively poor under its dead weight and the gravity effect of pre-buried bolt. And after concrete is poured, the levelness of the assembled top surface is difficult to meet the requirement of 1mm specified by the industry by only manually trowelling. Secondary grinding is often required manually to meet design requirements. Due to the problems, the construction period is prolonged, and the construction cost is greatly increased.
Disclosure of Invention
The invention aims to provide a reverse pouring construction method for a concrete tower drum transition section shell ring, wherein the embedded anchor bolts of the concrete tower drum transition section shell ring manufactured by the construction method are accurately positioned, the flatness of the top surface of the transition section shell ring meets the requirements, and the construction method improves the construction efficiency and reduces the construction cost.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the reverse pouring construction method for the concrete tower drum transition section shell ring comprises the steps that a die adopted by the concrete tower drum transition section shell ring comprises a bottom die, an inner die, an outer die and side dies on two sides, the bottom die consists of a bottom plate, a vertical plate and a top plate, the top plate is a semicircular plate, the width of the semicircular plate is larger than the thickness of the concrete tower drum transition section shell ring, a plurality of through holes are formed in the top plate, the positions and the number of the through holes are the same as those of embedded anchor bolts in the transition section shell ring, and the aperture of the through holes is larger than the diameter of the embedded anchor bolts; the bottom plate is a semicircular plate, a plurality of vertical plates are arranged between the top plate and the bottom plate, the vertical plates are arranged in a radial manner along the circumferential direction of the circular ring, and each vertical plate is positioned between two adjacent through holes of the top plate;
the reverse pouring construction method for the concrete tower transition section shell ring comprises the following steps:
step 1, placing a bottom die on the ground, enabling a top plate to face upwards, and leveling the bottom die;
step 2, erecting an inner die on the bottom die, wherein the inner die is the same as the existing template, and the inner die and the bottom die are connected and fixed through bolts;
step 3, erecting an upper flange on the bottom die, wherein through holes which are matched with the embedded anchor bolts of the transition section in number and position are formed in the upper flange, and a plurality of through holes of the upper flange are aligned with a plurality of through holes in the top plate of the bottom die;
step 4, screwing an embedded anchor bolt positioning nut into the top of the embedded anchor bolt, and inserting the top end of the embedded anchor bolt into the through hole of the bottom die top plate after penetrating through the through hole of the upper flange;
step 5, screwing a lower flange positioning nut into the bottom of the embedded anchor bolt, inserting the lower flange into the bottom of the embedded anchor bolt, and screwing a stress nut of the embedded anchor bolt into the bottom end;
step 6, hanging the reinforcement cage on the bottom die by a crane;
step 7, welding and fixing the lower flange and the peripheral reinforcement cage by using reinforcement bars in the circumferential direction of the lower flange;
step 8, placing the outer die on the bottom die, and connecting and fixing the outer die with the bottom die through bolts;
and 9, erecting side dies on two sides on the bottom die, wherein the side dies are the same as the existing die plate, and the side dies on two sides are fixedly connected with the bottom die through bolts.
The upper flange is provided with a skirt edge, a plurality of screw holes are formed in the skirt edge of the upper flange, and the screw holes are uniformly distributed along the circumferential direction of the skirt edge; the bottom of the outer die is provided with a plurality of screw holes close to the upper flange, and the diameters, the number and the positions of the screw holes are consistent with those of the screw holes on the skirt of the upper flange; and 8, screwing the upper flange fixing bolts into the screw holes of the outer die and the screw holes of the upper flange, and fixing the upper flange on the outer die.
The construction method further comprises the following steps: and 10, arranging a plurality of hanging points at the bottom of the concrete ring piece of the cylinder section of the transition section, and pouring concrete.
The aperture of the top plate through hole is 0.2mm larger than the diameter of the embedded anchor bolt.
The width of the top plate ring is 40-80 cm larger than the thickness of the ring piece of the cylinder section of the transition section, and the thickness of the top plate is not less than 10mm.
The vertical plate is a vertical rectangular plate, the height of the vertical plate is 15-30 cm, the width of the vertical plate is the same as the width of the circular ring of the top plate, and the thickness of the vertical plate is not less than 10mm.
The width of the circular ring of the bottom plate is not smaller than that of the circular ring of the top plate, and the thickness of the bottom plate is not smaller than 10mm.
The top plate, the vertical plate and the bottom plate of the bottom die are made of steel plates.
The aperture of the upper flange through hole is 3mm larger than the diameter of the embedded anchor bolt.
The height of the upper flange skirt edge is 10cm, the aperture of screw holes on the upper flange skirt edge is 10-20 mm, and the number of screw holes is 4-6.
Compared with the prior art, the reverse pouring construction method for the cylinder section of the transition section of the concrete tower cylinder has the beneficial effects that:
1. the through hole position on the bottom die can be manufactured on a machine tool through precise positioning processing, the aperture of the through hole is only 0.2mm larger than the diameter of the embedded anchor bolt, and the positioning accuracy of the embedded anchor bolt after the concrete tower section of transition section of the drum is manufactured is ensured, so that the concrete tower section of the drum and the steel tower section of the drum can be smoothly connected and installed.
2. The invention adopts reverse pouring, the top surface of the transition section shell ring is directly contacted with the bottom die during pouring, and the bottom die has high rigidity and high plane flatness of the top plate of the bottom die, so that the flatness of the top surface of the transition section shell ring can be ensured to meet the requirement.
The embedded anchor bolts of the concrete tower drum transition section shell ring manufactured by the concrete tower drum transition section shell ring reverse pouring construction method are accurate in positioning, the flatness of the top surface of the transition section shell ring meets the requirements, and therefore the problems that the flatness of the top surface of the concrete mixing tower drum transition section shell ring exceeds the standard and the embedded anchor bolts are inaccurate in positioning in the prior art are solved. The construction method not only improves the construction efficiency, but also reduces the construction cost.
Drawings
FIG. 1 is a schematic view of a concrete tower transition section shell ring;
FIG. 2 is a schematic diagram of the structure of the upper and lower flanges and the embedded bolts;
FIG. 3 is a schematic view of the bottom die structure of the present invention;
fig. 4 is a schematic diagram of reverse casting of a concrete tower transition section shell ring according to the present invention.
In the figure: 1 transition section shell ring, 2 upper flange, 3 lower flange, 4 pre-embedded anchor bolt, 5 bottom die, 6 inner die, 7 pre-embedded anchor bolt positioning nut, 8 lower flange positioning nut, 9 pre-embedded anchor bolt stress nut, 10 outer die, 11 upper flange positioning bolt; 51 top plate, 52 riser, 53 bottom plate.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
Referring to fig. 1 to 4, a reverse pouring construction method for a concrete tower transition section shell ring is provided, wherein a die adopted by the concrete tower transition section shell ring 1 comprises a bottom die 5, an inner die 6, an outer die 10 and side dies on two sides.
The bottom die 5 is composed of a bottom plate 53, vertical plates 52 and a top plate 51, referring to fig. 3, the top plate 51 is a semicircular plate, the width of the circular ring is larger than the thickness of the ring sheet of the cylinder section 1 of the transition section of the concrete tower, a plurality of through holes are formed in the top plate 51, the positions and the number of the through holes are the same as those of the embedded anchor bolts 4 in the ring sheet of the cylinder section 1 of the transition section, and the aperture of the through holes is larger than the diameter of the embedded anchor bolts 4. The bottom plate 53 is a semicircular plate, a plurality of vertical plates 52 are arranged between the top plate 51 and the bottom plate 53, the vertical plates 52 are arranged in a radial manner along the circumferential direction of the circular ring, and each vertical plate 52 is positioned between two adjacent through holes of the top plate 51.
Further, the top plate 51, the vertical plate 52 and the bottom plate 53 of the bottom mold 5 are made of steel plates. The aperture of the through hole of the top plate 51 is 0.2mm larger than the diameter of the embedded anchor bolt 4. The annular width of the top plate 51 is 40-80 cm larger than the annular thickness of the transition section shell ring 1, and the thickness of the top plate 51 is not smaller than 10mm. The vertical plate 52 is a vertical rectangular plate, the height of the vertical plate 52 is 15-30 cm, the width of the vertical plate 52 is the same as the annular width of the top plate 51, and the thickness of the vertical plate 52 is not less than 10mm. The annular width of the bottom plate 53 is not smaller than the annular width of the top plate 51, and the thickness of the bottom plate 53 is not smaller than 10mm.
Preferably, the top plate 51 is a semicircular plate, the circular width of the top plate 51 is 60cm greater than the thickness of the ring piece of the transition section shell ring 1, and the thickness of the top plate 51 is not less than 14mm; the aperture of the through hole of the top plate 51 is 0.2mm larger than the diameter of the embedded anchor bolt 4, and the position of the through hole is precisely positioned and processed on a machine tool. The vertical plates 52 are vertical rectangular plates, the height of each vertical plate 52 is 20cm, the width of each vertical plate 52 is the same as the annular width of the top plate 51, the thickness of each vertical plate 52 is 10mm, the number of the vertical plates 52 is determined according to the number of the embedded anchors 4 in the annular sheet of the transition section shell ring 1, the vertical plates are uniformly arranged as much as possible, and meanwhile, each vertical plate 52 is located between two adjacent through holes of the top plate 51. The bottom plate 53 is a semicircular plate, the circular ring width of the bottom plate 53 is 10cm wider than the circular ring width of the top plate 51, namely, the circular ring width of the bottom plate 53 is 10cm wider than the vertical plate 52, and the thickness of the bottom plate 53 is 14mm.
The reverse pouring construction method of the concrete tower drum transition section shell ring provided by the invention is based on the mould adopted by the concrete tower drum transition section shell ring 1, and comprises the following steps of:
in step 1, the bottom mold 5 is placed on the ground, the top plate 51 is upward and the bottom mold 5 is leveled.
Step 2, erecting an inner die 6 on the bottom die 5, wherein the inner die 6 is the same as the existing template, and the inner die 6 and the bottom die 5 are connected and fixed through bolts.
And 3, erecting an upper flange 2 on the bottom die 5, wherein through holes which are matched with the embedded bolts 4 of the transition section shell ring in number and position are arranged on the upper flange 2, and a plurality of through holes of the upper flange 2 are aligned with a plurality of through holes on the top plate 51 of the bottom die 5. The upper flange 2 is provided with a skirt edge, see fig. 2 and 4, the skirt edge is welded and fixed on the upper flange 2, a plurality of screw holes are formed in the skirt edge of the upper flange 2, and the screw holes are uniformly distributed along the circumferential direction of the skirt edge.
Preferably, the aperture of the through hole of the upper flange 2 is 3mm larger than the diameter of the embedded anchor bolt. The height of the skirt edge of the upper flange 2 is 10cm, the aperture of screw holes on the skirt edge of the upper flange is 10-20 mm, and the number of screw holes is 4-6. The hole diameter of the screw holes on the skirt edge of the upper flange is 12mm, the number of the screw holes is 4, and the screw holes are uniformly distributed along the circumferential direction of the skirt edge.
And 4, screwing the top of the embedded anchor bolt 4 into the embedded anchor bolt positioning nut 7, and inserting the top end of the embedded anchor bolt 4 into the through hole of the bottom die top plate 51 after penetrating through the through hole of the upper flange 2.
Step 5, screwing a lower flange positioning nut 8 at the bottom of the embedded anchor bolt 4, inserting the lower flange 3 into the bottom of the embedded anchor bolt 4, and screwing an embedded anchor bolt stress nut 9 at the bottom end.
Step 6, hanging the reinforcement cage on the bottom die 5 by a crane (not shown in the figure); the reinforcement cage is in the prior art and is used for meeting the stress requirement of the concrete tower drum transition section shell ring.
And 7, in the circumferential direction of the lower flange 3, welding and fixing the lower flange 3 and a peripheral reinforcement cage by using reinforcing steel bars (not shown in the figure) so as to prevent the embedded anchor bolts 4 from shaking too much when concrete is poured.
And 8, placing the outer die 10 on the bottom die 5, and connecting and fixing the outer die with the bottom die 5 by bolts. The bottom of the outer die is provided with a plurality of screw holes close to the upper flange 2, and the diameters, the number and the positions of the screw holes are consistent with those of the screw holes on the skirt edge of the upper flange 2. In step 8, the upper flange 2 is fixed on the outer die 10 by screwing the upper flange fixing bolts 11 into screw holes of the outer die 10 and screw holes of the upper flange 2, so that the upper flange 2 is prevented from shifting during concrete pouring.
And 9, erecting side molds on two sides on the bottom mold 5 (not shown in the figure), wherein the side molds are the same as the existing template, and the side molds on two sides are connected and fixed with the bottom mold 5 through bolts.
And 10, arranging a plurality of hanging points at the bottom of the concrete ring piece of the cylinder section of the transition section, and pouring concrete.
Step 11, after the concrete curing is completed, screwing out an upper flange fixing bolt 11 on the outer die 10, screwing out a bolt connected with the outer die 10 and the bottom die 5, and dismantling the outer die 10; screwing out bolts connected with the inner die 6 and the bottom die 5, and dismantling the inner die 6; and (5) screwing out the bolts connected with the side dies on the two sides and the bottom die 5, and removing the side dies on the two sides.
And 12, integrally lifting the concrete ring piece of the cylinder section of the transition section by using a crane, placing the concrete ring piece on a special overturning frame, and overturning the ring piece.
And 13, splicing the concrete ring pieces of the transition section cylinder section to form a complete transition section cylinder section.
The construction method of the invention avoids inaccurate positioning of the embedded anchor bolts in the traditional construction method, and often needs to enlarge the screw holes of the flange of the steel tower cylinder; and the need of secondary polishing treatment due to insufficient flatness of the top surface is avoided. The construction method not only improves the construction efficiency, but also reduces the construction cost.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention, therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A reverse pouring construction method for a concrete tower transition section shell ring is characterized by comprising the following steps:
the mould adopted by the concrete tower section of thick bamboo changeover portion shell ring comprises a bottom mould (5), an inner mould (6), an outer mould (10) and side moulds on two sides, wherein the bottom mould (5) consists of a bottom plate (53), a vertical plate (52) and a top plate (51), the top plate (51) is a semicircular plate, the width of the circular ring is larger than the thickness of a ring piece of the concrete tower section of thick bamboo section (1), a plurality of through holes are formed in the top plate (51), the positions and the number of the through holes are the same as those of the embedded anchor bolts (4) in the ring piece of the changeover portion shell section (1), and the aperture of the through holes is larger than the diameter of the embedded anchor bolts (4); the bottom plate (53) is a semicircular plate, a plurality of vertical plates (52) are arranged between the top plate (51) and the bottom plate (53), the vertical plates (52) are arranged in a radial manner along the circumferential direction of the circular ring, and each vertical plate (52) is positioned between two adjacent through holes of the top plate (51);
the reverse pouring construction method for the concrete tower transition section shell ring comprises the following steps:
step 1, placing a bottom die (5) on the ground, enabling a top plate (51) to face upwards and leveling the bottom die (5);
step 2, erecting an inner die (6) on a bottom die (5), wherein the inner die (6) is the same as the existing template, and the inner die (6) and the bottom die (5) are connected and fixed through bolts;
step 3, an upper flange (2) is erected on the bottom die (5), through holes which are matched with the embedded anchor bolts (4) of the transition section shell ring (1) in number and position are formed in the upper flange (2), and a plurality of through holes of the upper flange (2) are aligned with a plurality of through holes in the top plate (51) of the bottom die (5);
step 4, screwing an embedded anchor bolt positioning nut (7) into the top of the embedded anchor bolt (4), and inserting the top end of the embedded anchor bolt (4) into the through hole of the bottom die top plate (51) after penetrating through the through hole of the upper flange (2);
step 5, screwing a lower flange positioning nut (8) into the bottom of the embedded anchor bolt (4), inserting the lower flange (3) into the bottom of the embedded anchor bolt (4), and screwing an embedded anchor bolt stress nut (9) into the bottom end;
step 6, hanging the reinforcement cage on the bottom die (5) by using a crane;
step 7, welding and fixing the lower flange (3) and a peripheral reinforcement cage by using reinforcement bars in the circumferential direction of the lower flange (3);
step 8, placing the outer die (10) on the bottom die (5), and connecting and fixing the outer die with the bottom die (5) by bolts;
and 9, erecting side dies on two sides on the bottom die (5), wherein the side dies are the same as the existing die plates, and the side dies on two sides are connected and fixed with the bottom die (5) through bolts.
2. The reverse pouring construction method for the concrete tower transition section shell ring according to claim 1, which is characterized by comprising the following steps: the upper flange (2) is provided with a skirt edge, a plurality of screw holes are formed in the skirt edge of the upper flange (2), and the screw holes are uniformly distributed along the circumferential direction of the skirt edge; the bottom of the outer die (10) is provided with a plurality of screw holes close to the upper flange (2), and the diameters, the number and the positions of the screw holes are consistent with those of the screw holes on the skirt of the upper flange (2); in the step 8, an upper flange fixing bolt (11) is screwed into a screw hole of the outer die (10) and a screw hole of the upper flange (2), and the upper flange (2) is fixed on the outer die (10).
3. The concrete tower transition section shell ring reverse pouring construction method according to claim 1 or 2, characterized by comprising the following steps: the construction method further comprises the following steps: and 10, arranging a plurality of hanging points at the bottom of the concrete ring piece of the transition section shell ring (1), and pouring concrete.
4. The reverse pouring construction method for the concrete tower transition section shell ring according to claim 1, which is characterized by comprising the following steps: the aperture of the through hole of the top plate (51) is 0.2mm larger than the diameter of the embedded anchor bolt (4).
5. The reverse pouring construction method for the concrete tower transition section shell ring according to claim 1, which is characterized by comprising the following steps: the annular width of the top plate (51) is 40-80 cm larger than the annular thickness of the transition section shell ring (1), and the thickness of the top plate (51) is not smaller than 10mm.
6. The reverse pouring construction method for the concrete tower transition section shell ring according to claim 1 or 5, wherein the reverse pouring construction method is characterized in that: the vertical plate (52) is a vertical rectangular plate, the height of the vertical plate (52) is 15-30 cm, the width of the vertical plate (52) is the same as the width of the circular ring of the top plate (51), and the thickness of the vertical plate (52) is not less than 10mm.
7. The reverse pouring construction method for the concrete tower transition section shell ring according to claim 1 or 5, wherein the reverse pouring construction method is characterized in that: the annular width of the bottom plate (53) is not smaller than that of the top plate (51), and the thickness of the bottom plate (53) is not smaller than 10mm.
8. The reverse pouring construction method for the concrete tower transition section shell ring according to claim 1, which is characterized by comprising the following steps: the top plate (51), the vertical plate (52) and the bottom plate (53) of the bottom die (5) are made of steel plates.
9. The reverse pouring construction method for the concrete tower transition section shell ring according to claim 1, which is characterized by comprising the following steps: the aperture of the through hole of the upper flange (2) is 3mm larger than the diameter of the embedded anchor bolt (4).
10. The concrete tower transition section shell ring reverse pouring construction method according to claim 2 or 9, characterized by comprising the following steps: the height of the skirt edge of the upper flange (2) is 10cm, the aperture of screw holes on the skirt edge of the upper flange (2) is 10-20 mm, and the number of screw holes is 4-6.
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