CN115991585A - Reinforcement-cage-free wind power tower tube sheet and preparation method thereof - Google Patents
Reinforcement-cage-free wind power tower tube sheet and preparation method thereof Download PDFInfo
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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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Abstract
The invention provides a non-ferrous alloyA steel reinforcement cage wind power tower tube sheet and a preparation method thereof belong to the technical field of wind power towers. The reinforcement cage-free wind power tower is formed by pouring concrete, and the concrete comprises the following components in parts by weight: 900-1500kg/m of sand 3 200-900kg/m of cement 3 Glass beads 0-500kg/m 3 0-500kg/m of fly ash 3 0-500kg/m of silica fume 3 7-400kg/m of water reducer 3 60-250kg/m of fibrous material 3 100-300kg/m of water 3 . By adding fiber materials into the wind power tower, the tensile strength of the wind power tower tube piece is greatly improved, and a steel reinforcement cage design is not needed.
Description
Technical Field
The invention belongs to the technical field of wind power tower bobbin sheet materials, and particularly relates to a reinforcement cage-free wind power tower bobbin sheet and a preparation method thereof.
Background
In order to ensure that the large-volume wind power tower barrel has qualified strength, the wind power tower barrel is manufactured by combining a reinforcement cage with concrete, the conventional method is that the reinforcement cage is firstly manufactured, the reinforcement cage is put into a pipe piece mould, then concrete mortar is poured into the pipe piece mould, the reinforcement cage wind power tower barrel pipe piece is formed after the reinforcement cage wind power tower barrel piece is solidified, then a plurality of reinforcement cage wind power tower barrel pieces are assembled into the wind power tower barrel in a butt joint mode, and special grouting materials are poured into joints.
However, the steel reinforcement cage needs to be manufactured manually or by a seam welder, the manufacturing process is complicated, particularly, the large-size duct piece with the diameter of more than 5 meters is manufactured, the required steel reinforcement cage is more difficult to produce, and the cost of the steel reinforcement cage is higher, so that the wind power tower tube piece without the steel reinforcement cage is generated.
The steel reinforcement cage-free wind power tower tube sheet does not provide enough tensile strength and compressive strength due to the fact that the steel reinforcement cage does not exist, and the tube sheet can be cracked when the strength of concrete is insufficient to resist tensile stress generated by shrinkage. Therefore, it is urgently required to design a steel reinforcement cage-free wind power tower tube sheet and a preparation method thereof, and the concrete has excellent tensile strength, compressive strength and durability. The reinforced cage-free wind power tower tube segment formed by casting the concrete is not easy to crack.
Ultra high performance concrete, UHPC (Ultra-High Performance Concrete), also known as reactive powder concrete (RPC, reactive Powder Concrete). Ultra-high performance concrete comprises two aspects, "ultra-high" -ultra-high durability and ultra-high mechanical properties. The design theory of ultra-high performance concrete is the maximum bulk density theory (densified particle packing), wherein the particles with different particle diameters of the constituent materials form the closest packing in the optimal proportion, namely, the gaps of the packing of millimeter-sized particles (aggregate) are filled by micron-sized particles (cement, fly ash and mineral powder), and the gaps of the packing of the micron-sized particles are filled by submicron-sized particles (silica fume). Aspects of UHPC that differ from ordinary concrete or high performance concrete include: the coarse aggregate is not used, silica fume and fiber materials are needed, the cement consumption is large, and the water-cement ratio is low.
Ultra-high performance concrete has been applied to the fields of subway segments and the like, but has not been applied to wind power towers. Because the application scenes of the subway segment and the wind power tower are completely different (different stress conditions), the performance requirements (tensile strength, compressive strength and durability) of the ultra-high-performance concrete are also completely different, and the conventional ultra-high-performance concrete for the subway segment cannot be directly used for the wind power tower. Therefore, there is a need for further optimizing ultra-high performance concrete in the related art to obtain a reinforcement cage free wind power tower tube sheet that is excellent in strength and durability.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems: the effect that the wind power tower section of jurisdiction does not have the steel reinforcement cage can not be realized to conventional concrete or high performance concrete, can be used to the ultra-high performance concrete of bulky section of jurisdiction such as subway section of jurisdiction, and the performance requirement is lower, can't be applied to wind power tower section of jurisdiction field. Therefore, it is urgently required to design a wind power tower tube sheet without a reinforcement cage and a preparation method thereof.
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a reinforcement cage-free wind power tower tube sheet and a preparation method thereof, wherein the wind power tower tube sheet has excellent tensile strength, compressive strength and durability, is not easy to crack and has long service life.
The embodiment of the invention provides a steel reinforcement cage-free wind power tower tube segment which is formed by pouring concrete, wherein the concrete comprises the following components in parts by weight: 900-1500kg/m of sand 3 200-900kg/m of cement 3 Glass bead 0-500kg/m 3 0-500kg/m of fly ash 3 0-500kg/m of silica fume 3 7-400kg/m of water reducer 3 60-250kg/m of fibrous material 3 100-300kg/m of water 3 。
The embodiment of the invention also provides a concrete segment without the reinforcement cage, which is formed by casting the concrete of the embodiment of the invention.
The reinforcement cage-free wind power tower tube sheet provided by the embodiment of the invention has the advantages and technical effects that:
the fiber material is added into the reinforcement cage-free wind power tower tube segment and other components and contents thereof are optimized, so that the wind power tower tube segment has excellent tensile strength and compressive strength, is not easy to crack, and can achieve good durability without the design of reinforcement cages.
In some embodiments, the concrete comprises the following components in parts by weight: 1100-1300kg/m sand 3 600-700kg/m of cement 3 Glass beads 150-250kg/m 3 30-70kg/m of fly ash 3 50-150kg/m of silica fume 3 7-12kg/m of water reducer 3 130-170kg/m of fibrous material 3 150-200kg/m of water 3 。
In some embodiments, the fibrous material comprises at least one of metal fibers, organic synthetic fibers, and inorganic fibers.
In some embodiments, the metal fibers comprise at least one of steel fibers, iron fibers, copper fibers, aluminum fibers.
In some embodiments, the organic synthetic fibers comprise polyvinyl alcohol fibers and/or polypropylene fibers.
In some embodiments, the inorganic fibers comprise at least one of carbon fibers, alkali resistant glass fibers, basalt fibers.
In some embodiments, the fibrous material comprises at least one of spiral fibers, straight fibers, prismatic fibers, wavy fibers, hooked fibers, large-headed fibers, double-pointed fibers, bundled fibers.
In some embodiments, the fibrous material is a spiral fiber that is helically curved in the length direction to form a spiral structure with a circular cross-section.
In some embodiments, the helical fiber has a turnup diameter of 10-50mm, a number of turns of 5-20, a pitch of 3-10mm, and a straightened length of 100-300mm.
The embodiment of the invention also provides a preparation method of the reinforced cage-free concrete segment, which comprises the following steps:
(1) And (3) die installation: firstly, installing a bottom die, then positioning, installing and fixing an inner die, then positioning, installing and fixing an outer die, and finally installing a top die to obtain a wind power tower bobbin sheet die;
(2) And (3) concrete production: mixing cement, silica fume, glass beads, fly ash, sand, a water reducing agent, a fiber material and water, and uniformly stirring to obtain the concrete;
(3) Pouring into a mold: pouring the concrete into the wind power tower bobbin sheet die by a top pouring method or a bottom jacking method;
(4) Demolding: after pouring is completed, removing the wind power tower tube sheet mould when the strength of the concrete test block under the same condition meets the requirement of demoulding strength, so as to obtain a wind power tower tube sheet semi-finished product;
(5) Curing: and after demolding, carrying out heat preservation and moisture preservation maintenance on the wind power tower tube segment semi-finished product until the strength of the tube segment material reaches the factory strength, and obtaining the wind power tower tube segment.
The preparation method of the reinforcement cage-free wind power tower tube segment provided by the embodiment of the invention has the following advantages and technical effects:
(1) In the preparation method of the embodiment of the invention, the fiber material is added into the concrete in the step (2), so that the concrete has excellent tensile strength, and other components and the content thereof are regulated, so that the segment of the wind power tower without the reinforcement cage is not easy to crack, and the durability is good;
(2) In the preparation method of the embodiment of the invention, in the step (3), a top pouring method or a bottom jacking method is adopted to pour to obtain the wind power tower tube sheet without the reinforcement cage, the construction steps are simple, and the method is suitable for industrialized popularization;
(3) Because the wind power tower bobbin sheet does not need a reinforcement cage, the wind power tower bobbin sheet die used by the preparation method disclosed by the embodiment of the invention is relatively simple in structure, and relatively low in difficulty in pouring concrete into the die, so that the method is suitable for mass production.
In some embodiments, in step (2), the raw materials except for the fiber materials are first put into a mixer for mixing at one time, and after being uniformly stirred, the fiber materials are put into the mixer for mixing in batches, so as to obtain the concrete.
In some embodiments, after the pouring is completed in step (4), a heat preservation measure is arranged outside the wind power tower tube sheet die if the pouring is in winter, and if the pouring is not in winter, no special measure is needed.
In some embodiments, in step (5), the wind power tower tube sheet is subjected to thermal insulation and moisture maintenance for not less than 48 hours at room temperature.
Drawings
FIG. 1 is a schematic perspective view of a segment of a reinforcement cage-free wind power tower;
FIG. 2 is a schematic top view of a segment of a reinforcement cage-free wind power tower of the present invention;
FIG. 3 is another perspective view of a segment of a reinforcement cage-free wind power tower according to the present invention;
FIG. 4 is another schematic top view of a reinforcement cage free wind power tower tube segment of the present invention;
FIG. 5 is a perspective view of spiral fibers in a non-reinforcement cage wind power tower segment of the present invention;
FIG. 6 is an elevation view of spiral fibers in a non-reinforcement cage wind power tower segment of the present invention;
FIG. 7 is a side view of spiral fibers in a non-reinforcement cage wind power tower segment of the present invention;
FIG. 8 is a schematic flow chart of a method for preparing a segment of a reinforcement cage-free wind power tower drum of the invention;
FIG. 9 is a schematic structural view of a steel reinforcement cage-free wind power tower bobbin sheet mold of the present invention;
FIG. 10 is a schematic flow chart of pouring a steel reinforcement cage-free wind power tower bobbin sheet into a mold by a top pouring method;
FIG. 11 is a schematic flow chart of pouring a steel reinforcement cage-free wind power tower bobbin sheet into a mold by adopting a bottom jacking method.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The embodiment of the invention provides a steel reinforcement cage-free wind power tower tube segment which is formed by pouring concrete, wherein the concrete comprises the following components in parts by weight: 900-1500kg/m of sand 3 200-900kg/m of cement 3 Glass beads 0-500kg/m 3 0-500kg/m of fly ash 3 0-500kg/m of silica fume 3 7-400kg/m of water reducer 3 60-250kg/m of fibrous material 3 100-300kg/m of water 3 . The structure of the wind power tower tube piece is shown in figures 1-4.
According to the wind power tower tube sheet, the particles with different particle diameters of the concrete component materials form the closest packing in the optimal proportion, namely, the gaps of millimeter-sized particle (sand) packing are filled with micron-sized particles (cement, glass beads and fly ash), and the gaps of micron-sized particle packing are filled with submicron-sized particles (silica fume), so that the compressive strength of the wind power tower tube sheet is not lower than 150MPa; by adding a proper amount of fiber materials, the tensile strength of the concrete is effectively improved and is not lower than 5.0MPa, so that the wind power tower tube piece is not easy to crack under the condition of no reinforcement cage, and has good durability.
The sand is used as fine aggregate in concrete, and the addition amount of the sand is 900-1500kg/m 3 Cement as a gel material in concrete in an amount of 200-900kg/m 3 The bone cement ratio is lower than that of common concrete cement, which is helpful for improving the strength and workability of the concrete. If the addition amount of sand is less than 900kg/m 3 The bone cement ratio of the concrete is too low, anThe compressive strength and the tensile strength of the concrete are affected, the performance requirement of the ultra-high performance concrete cannot be met, and the required strength and durability of the wind power tower tube sheet cannot be met under the condition of no reinforcement cage. If the sand addition amount is more than 1500kg/m 3 And if the bone cement ratio of the concrete is too high, the workability of the concrete is poor, the vibration is not compact, and the quality of the wind power tower tube piece is affected.
Cement as gel material in concrete with addition amount of 200-900kg/m 3 And the water is added in an amount of 100-300kg/m 3 The water-cement ratio is far lower than that of common concrete cement, so that the wind power tower tube sheet has excellent strength and high durability. If the cement addition amount is less than 200kg/m 3 The compressive strength and the tensile strength of the concrete are affected, the performance requirement of the ultra-high performance concrete cannot be met, and the required strength and durability of the wind power tower tube sheet cannot be met under the condition of no reinforcement cage. If the cement addition amount is higher than 900kg/m 3 The concrete mortar is too high in viscosity and poor in fluidity, the surface is quick in water loss and easy to crust, and casting molding of the wind power tower bobbin piece is affected.
Because the viscosity of the concrete is higher, the glass beads are mainly added to reduce the viscosity of the concrete and increase the fluidity of the concrete, so that the addition amount of the glass beads is controlled to be 0-500kg/m 3 . If the addition amount of the glass beads is more than 500kg/m 3 The addition amount of other components is reduced, and the comprehensive performance of the concrete and the wind power tower tube piece is affected.
The effect of the fly ash in the concrete is that gaps between sand and cement can be smaller, the density of the concrete structure can be improved, in addition, the fly ash has low water adsorption property, so that the concrete has good fluidity in the mixing process, and the addition amount of the fly ash in the embodiment of the invention is 0-500kg/m 3 . If the addition amount of fly ash is more than 500kg/m 3 The addition amount of other components is reduced, and the comprehensive performance of the concrete and the wind power tower tube piece is affected.
The silica fume is used as an ultrafine admixture in concrete and is used for filling gaps among micron-sized particles (cement, glass beads and fly ash) and millimeter-sized particles (sand) to improve the density of the concrete structure, so that the addition amount of the silica fume in the embodiment of the invention is 0-500kg/m 3 . If the addition amount of silica fume is more than 500kg/m 3 The addition amount of other components is reduced, and the comprehensive performance of the concrete and the wind power tower tube piece is affected.
The water reducer has a dispersing effect on cement particles after being added into concrete, can improve the workability, reduce the unit water consumption and improve the fluidity of the concrete, so that the addition amount of the water reducer in the embodiment of the invention is 7-400kg/m 3 . If the addition amount of the water reducing agent is less than 7kg/m 3 And the fluidity of the concrete is poor, and the wind power tower tube piece is not easy to pour. If the addition amount of the water reducing agent is more than 400kg/m 3 The addition amount of other components can be reduced, and the comprehensive performance of the concrete and the wind power tower tube piece is affected.
The research shows that the fiber material only has an effect on the tensile property of the concrete, the effect is realized by the doping amount, and the tensile strength reaching about 5MPa generally needs 37.5-50kg/m 3 The fiber content of (2) is 62.5kg/m when the tensile strength of 7MPa or more is reached 3 The above fiber blending amount. In some embodiments, the concrete comprises the following components in parts by weight: 1100-1300kg/m sand 3 600-700kg/m of cement 3 Glass beads 150-250kg/m 3 30-70kg/m of fly ash 3 50-150kg/m of silica fume 3 7-12kg/m of water reducer 3 130-170kg/m of fibrous material 3 150-200kg/m of water 3 . When the content of each component is within the above preferred range, the tensile strength of the wind power tower tube piece is higher.
In some embodiments, the fibrous material comprises at least one of metal fibers, organic synthetic fibers, and inorganic fibers.
In some embodiments, the metal fibers comprise at least one of steel fibers, iron fibers, copper fibers, aluminum fibers.
In some embodiments, the organic synthetic fibers comprise polyvinyl alcohol fibers and/or polypropylene fibers.
In some embodiments, the inorganic fibers comprise at least one of carbon fibers, alkali resistant glass fibers, basalt fibers.
Preferably, in some embodiments, the fiber material is steel fiber, and the steel fiber refers to fiber with an aspect ratio of 40-80, which is manufactured by a cold drawn steel wire cutting method, a cold rolled steel strip shearing method, a steel ingot milling method, a molten steel condensing method, or the like. And adding the steel fibers into a concrete raw material to obtain the wind power tower tube sheet with excellent tensile strength.
The properties of the steel fibers are also quite different due to different manufacturing methods, for example, the tensile strength of the steel fibers produced by a cold-drawn steel wire cutting method is 380-3000MPa, the tensile strength of the steel fibers produced by a cold-rolled steel strip shearing method is 600-900MPa, the tensile strength of the steel fibers produced by a steel ingot milling method is about 700MPa, and the tensile strength of the steel fibers produced by a molten steel condensing method is about 380 MPa. Thus, preferably, in some embodiments, the steel fibers are cold drawn wire cut-off steel fibers that help to increase the tensile strength of the wind tower segment.
The wind power tower bobbin sheet according to the embodiment of the present invention is not particularly limited in shape to the steel fiber, and may include at least one of a spiral fiber, a straight fiber, a prismatic fiber, a wavy fiber, a hook fiber, a large-headed fiber, a double-pointed fiber, a bundle fiber, and the like, for example.
Preferably, in some embodiments, the fiber material is a spiral fiber, and the fiber material is spirally curved in the length direction to form a spiral structure, and the cross section is circular, and the specific structure is shown in fig. 5-7. By adding the spiral fibers into concrete, compared with fiber materials in other shapes, the friction area between the spiral fibers and other materials of the concrete can be obviously increased, the bonding strength between the spiral fibers and other materials of the concrete is obviously enhanced, and the tensile property is better exerted, so that the crack resistance and the toughening effect of the fiber materials on the wind power tower tube piece are further improved.
In some embodiments, the helical fiber has a turnup diameter of 10-50mm, a number of turns of 5-20, a pitch of 3-10mm, and a straightened length of 100-300mm. By optimizing the parameters of the spiral fiber, the tensile strength of the spiral fiber is not lower than 1700MPa, thereby being beneficial to further improving the tensile strength of the wind power tower tube segment and reducing the possibility of cracking.
The spiral fiber has the spiral bending diameter of 10-50mm, and has the following effects: the spiral fiber is doped in the wind power tower tube segment, the spiral fiber and the concrete matrix have excellent bonding strength, the tensile property can be fully exerted, the concrete matrix is not damaged excessively even if the fiber is broken or pulled out, and the possibility of cracking the wind power tower tube segment is greatly reduced. If the spiral diameter is small, the adhesion between the spiral fiber and the concrete matrix is insufficient, and if the spiral diameter is large, the doping of the spiral fiber may affect the structural performance of the concrete matrix itself, and the fiber material may damage the concrete matrix when pulled out.
The spiral fiber has the following effects that the rotation number of the spiral fiber is 5-20: in the case of excellent adhesive strength between the spiral fibers and the concrete matrix, breakage or pulling out of the fiber material does not result in excessive damage to the concrete matrix. If the number of turns is small, the adhesion between the spiral fiber and the concrete matrix is insufficient, and if the number of turns is large, the doping of the spiral fiber may affect the structural properties of the concrete matrix itself and may damage the concrete matrix when pulled out.
The pitch of the spiral fiber is 3-10mm, and the pitch refers to the distance between adjacent coils. The screw pitch is 3-10mm, so that the spiral fiber and the concrete matrix have stronger adhesion and interaction. If the pitch is too small or too large, both the interaction and anchoring relationship between the helical fiber and the concrete matrix may be affected.
The straightening length of the spiral fiber is 100-300mm. The straightened length of the helical fiber refers to the length of the fiber after the helical fiber has been straightened. The extension length of the spiral fiber is too short, so that the spiral fiber cannot rotate to form a coil with a sufficient number, the extension length of the spiral fiber is too long, the fiber is easy to agglomerate, the fiber is not easy to be uniformly mixed with other concrete raw materials, the uniformity of the distribution of the spiral fiber in the wind power tower tube piece can be affected, and the local tensile property of the wind power tower tube piece can be further affected.
The segments of the reinforcement cage-free wind power tower barrel can be produced by single-ring segments as shown in figures 1-2 or multi-ring segments as shown in figures 3-4. The segment of the wind power tower tube without the reinforcement cage can be produced in a full circle or can be produced in a plurality of pieces, and the vertical seams of the segments can be connected through bolts to form the full circle.
The embodiment of the invention also provides a preparation method of the wind power tower tube segment without the reinforcement cage, which is shown in fig. 8 and comprises the following steps:
(1) And (3) die installation: firstly, installing a bottom die, then positioning, installing and fixing an inner die, then positioning, installing and fixing an outer die, and finally installing a top die to obtain a wind power tower bobbin sheet die;
(2) And (3) concrete production: mixing cement, silica fume, glass beads, fly ash, sand, a water reducing agent, a fiber material and water, and uniformly stirring to obtain the concrete;
(3) Pouring into a mold: pouring the concrete into the wind power tower bobbin sheet die by a top pouring method or a bottom jacking method;
(4) Demolding: after pouring is completed, removing the wind power tower tube sheet mould when the strength of the concrete test block under the same condition meets the requirement of demoulding strength, so as to obtain a wind power tower tube sheet semi-finished product;
(5) Curing: and after demolding, carrying out heat preservation and moisture preservation maintenance on the wind power tower tube segment semi-finished product until the strength of the tube segment material reaches the factory strength, and obtaining the wind power tower tube segment.
In the step (1), the wind power tower tube sheet die can be assembled by adopting various templates such as a steel template, a wood template, a 3D printing composite material template and the like. As shown in fig. 9, the wind power tower bobbin sheet mold is divided into a bottom mold, an inner mold, an outer mold, and a top mold. Firstly, the levelness of the top surface of the bottom die is ensured when the bottom die is installed, and the inner die is positioned, installed and fixed after the bottom die is installed. And after the inner die is installed, repositioning, installing and fixing the outer die. And finally, installing a top die.
In the step (2), concrete for pouring the wind power tower tube segments can be prepared by on-site stirring, and can also be prepared in a form of premixing ton package materials. The concrete production method specifically comprises the following steps: and (3) mixing materials by using a mixing station, mixing concrete raw materials, adding other materials except the fiber materials into a mixer at one time, stirring for 1min, observing whether the ingredients in the mixer are sufficiently mixed, if so, gradually adding the fiber materials into the mixer in a divided manner, and completing the mixing after the ingredients in the mixer are sufficiently mixed. In order to match with the on-site production process, the stirrer should keep working state after stirring sufficiently so as to maintain the state of the concrete material.
In the step (3), when the top pouring method shown in fig. 10 is adopted, the pouring can be performed through the free falling of a hopper, or through pumping, an inclined self-flow groove can be arranged at a discharge hole during pouring, so that the concrete material slowly flows into the bottom of the die at a low speed. When the bottom jacking method shown in fig. 11 is adopted, a hole channel is arranged on the bottom die or the outer die, concrete in the embodiment of the invention is pumped through the hole channel, the casting liquid level height is observed at the top of the die, and the pumping can be stopped after the liquid level height meets the requirement of the casting height.
In the step (4), after pouring is finished, heat preservation measures are arranged outside the die if winter is adopted, and special measures are not needed if winter is not adopted. And (3) when the strength of the concrete test block under the same condition meets the requirement of demoulding strength, dismantling the wind power tower tube sheet mould to obtain a wind power tower tube sheet semi-finished product.
In the step (5), after demolding, carrying out heat preservation and moisture preservation maintenance on the duct piece until the duct piece material strength reaches the factory strength, and obtaining the wind power tower duct piece.
According to the preparation method of the embodiment of the invention, the wind power tower tube piece mold is combined with a top pouring method shown in fig. 10 or a bottom jacking method shown in fig. 11 to manufacture the tube piece. The preparation method of the embodiment of the invention uses the fiber material with high strength, so that compared with the traditional reinforced concrete pipe piece, the wind power tower pipe piece can adopt a reinforcement cage-free design. Compared with the traditional common reinforcement cage concrete segment adopting the reinforcement cage process, the wind power tower segment provided by the embodiment of the invention omits the manufacturing process flow of the reinforcement cage, improves the production efficiency and is beneficial to large-scale mechanical production. And the pipe piece maintenance is carried out by adopting constant temperature heat preservation measures in the later stage, so that the quality of the pipe piece is ensured. Compared with the traditional common reinforced cage concrete pipe piece, the reinforced cage-free wind power tower pipe piece provided by the embodiment of the invention has the advantages of smaller size, lighter weight and cheaper transportation and hoisting.
The present invention will be described in detail with reference to the following examples and drawings.
Example 1
The reinforced cage-free wind power tower tube sheet is formed by casting UHPC concrete, and the UHPC concrete comprises the following components in parts by weight: cement 650kg/m 3 100kg/m of silica fume 3 200kg/m of glass beads 3 50kg/m of fly ash 3 390kg/m of No. 5 sand (quartz sand with the diameter of 0.5-1.5 mm) 3 790kg/m sand No. 6 (quartz sand with diameter of 0.2-0.5 mm) 3 9kg/m water reducer 3 156kg/m of fibrous material 3 180kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the The fiber material adopts spiral steel fiber which is spirally bent in the length direction to form a spiral structure, the cross section is circular, the structure is shown in figures 5-7, the spiral steel fiber has a spiral bending diameter of 35mm, a rotation circle number of 15, a thread pitch of 8mm, a straightening length of 200mm and a tensile strength of not less than 2200MPa. The structure of the segment of the wind power tower without the reinforcement cage is shown in figures 1-2.
The preparation method of the reinforcement cage-free wind power tower tube segment, as shown in fig. 8, comprises the following steps:
(1) And (3) die installation: the wind power tower tube sheet die is assembled by adopting a wood template. As shown in fig. 9, the wind power tower bobbin sheet mold is divided into a bottom mold, an inner mold, an outer mold, and a top mold. Firstly, the levelness of the top surface of the bottom die is ensured when the bottom die is installed, and the inner die is positioned, installed and fixed after the bottom die is installed. And after the inner die is installed, repositioning, installing and fixing the outer die. And finally, installing a top die.
(2) And (3) concrete production: and (3) mixing materials by using a mixing station, mixing concrete raw materials, adding other materials except the steel fibers into a mixer at one time, stirring for 1min, observing whether the ingredients in the mixer are sufficiently mixed, if so, gradually putting the steel fibers into the mixer in a divided manner, and completing the mixing after the ingredients in the mixer are sufficiently mixed. In order to match with the on-site production process, the stirrer should keep working state after stirring sufficiently so as to maintain the state of the concrete material.
(3) Pouring into a mold: as shown in fig. 11, a hole is formed in the outer mold, UHPC concrete is pumped through the hole, the casting liquid level is observed at the top of the mold, and after the liquid level meets the requirement of the casting height, the pumping can be stopped.
(5) Demolding: after pouring is finished, heat preservation measures are arranged outside the die if the die is in winter, and special measures are not needed if the die is not in winter. And (3) when the strength of the concrete test block under the same condition meets the requirement of demoulding strength, dismantling the wind power tower tube sheet mould to obtain a wind power tower tube sheet semi-finished product.
(5) Curing: and (3) carrying out wet heat curing on the duct piece for 50 hours in an electric heating die mode after demoulding until the duct piece material strength reaches the factory strength, and obtaining the wind power tower duct piece.
The compressive strength of the segment of the wind power tower tube without the reinforcement cage is 180MPa, and the tensile strength is 9.0MPa.
Example 2
A wind power tower bobbin sheet without reinforcement cage and a preparation method thereof, wherein the steel fiber adopts a high-strength steel wire to cut off double-hook steel fiber (5G 65/60 GH), the length of the steel fiber is 60mm, the diameter is 0.9mm, the length-diameter ratio is 65, and the tensile strength is not lower than 2000MPa. Other conditions were the same as in example 1.
The compressive strength of the segment of the wind power tower tube without the reinforcement cage is 180MPa, and the tensile strength is 7.0MPa.
Comparative example 1
The steel fiber is not added to the segment of the wind power tower tube without the reinforcement cage in the embodiment, and other conditions are the same as those in the embodiment 1.
The compressive strength of the segment of the wind power tower tube without the reinforcement cage is 150MPa, and the tensile strength is 3.5MPa.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The wind power tower tube sheet without the reinforcement cage is characterized by being formed by pouring concrete, and the concrete comprises the following components in parts by weight: 900-1500kg/m of sand 3 200-900kg/m of cement 3 Glass beads 0-500kg/m 3 0-500kg/m of fly ash 3 0-500kg/m of silica fume 3 7-400kg/m of water reducer 3 60-250kg/m of fibrous material 3 100-300kg/m of water 3 。
2. The steel reinforcement cage-free wind power tower tube piece according to claim 1, wherein the concrete comprises the following components in parts by weight: sand 1100-1300kg/m 3 600-700kg/m of cement 3 Glass beads 150-250kg/m 3 30-70kg/m of fly ash 3 50-150kg/m of silica fume 3 7-12kg/m of water reducer 3 130-170kg/m of fibrous material 3 150-200kg/m of water 3 。
3. The steel reinforcement cage-free wind power tower segment according to claim 1 or 2, wherein the fiber material comprises at least one of metal fibers, organic synthetic fibers and inorganic fibers; preferably, the metal fibers comprise at least one of steel fibers, iron fibers, copper fibers, aluminum fibers; preferably, the organic synthetic fibers comprise polyvinyl alcohol fibers and/or polypropylene fibers; preferably, the inorganic fiber comprises at least one of carbon fiber, alkali-resistant glass fiber and basalt fiber.
4. The reinforcement cage-free wind power tower segment according to claim 1 or 2, wherein said fiber material comprises at least one of spiral fibers, straight fibers, prismatic fibers, wavy fibers, hooked fibers, large-headed fibers, double-pointed fibers, bundled fibers.
5. The steel reinforcement cage-free wind power tower tube segment according to claim 4, wherein the fiber material is spiral fiber, the steel fiber is spirally bent in the length direction to form a spiral structure, and the cross section is circular.
6. The reinforcement cage-free wind power tower tube segment according to claim 5, wherein the spiral fiber has a spiral bend diameter of 10-50mm, a rotation number of 5-20, a screw pitch of 3-10mm and a straightening length of 100-300mm.
7. The method for preparing the segments of the reinforcement cage-free wind power tower according to any one of claims 1 to 6, comprising the following steps:
(1) And (3) die installation: firstly, installing a bottom die, then positioning, installing and fixing an inner die, then positioning, installing and fixing an outer die, and finally installing a top die to obtain a wind power tower bobbin sheet die;
(2) And (3) concrete production: mixing cement, silica fume, glass beads, fly ash, sand, a water reducing agent, a fiber material and water, and uniformly stirring to obtain the concrete;
(3) Pouring into a mold: pouring the concrete into the wind power tower bobbin sheet die by a top pouring method or a bottom jacking method;
(4) Demolding: after pouring is completed, removing the wind power tower tube sheet mould when the strength of the concrete test block under the same condition meets the requirement of demoulding strength, so as to obtain a wind power tower tube sheet semi-finished product;
(5) Curing: and after demolding, carrying out heat preservation and moisture preservation maintenance on the wind power tower tube segment semi-finished product until the strength of the tube segment material reaches the factory strength, and obtaining the wind power tower tube segment.
8. The method for producing a reinforcement cage-free wind power tower segment according to claim 7, wherein in the step (2), the raw materials except the fiber materials are firstly put into a mixer for mixing at one time, and after being uniformly stirred, the fiber materials are put into the mixer for mixing in batches, so that the concrete is obtained.
9. The method for manufacturing the reinforcement cage-free wind power tower tube segment according to claim 7, wherein in the step (4), after pouring is completed, heat preservation measures are arranged outside the wind power tower tube segment mold if winter is performed, and special measures are not needed if winter is not performed.
10. The method for producing a reinforcement cage-free wind power tower tube segment according to claim 7, wherein in the step (5), the wind power tower tube segment is subjected to heat preservation and moisture preservation maintenance for not less than 48 hours at room temperature.
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