High-stability reinforcing method for prefabricated wind power generation concrete tower drum door opening

Abstract

The invention relates to a high-stability reinforcing method for a prefabricated wind power generation concrete tower drum door opening, which comprises the following steps that a door opening reinforcing cross beam is arranged above the door opening, the width of the cross section of the door opening reinforcing cross beam is increased by protruding towards the inner side of a tower drum and protruding towards the outer side of the tower drum, and the door opening reinforcing cross beam is in transition connection with a bottom drum section; door opening reinforcing side columns protruding towards the inner side of the tower drum and the outer side of the tower drum are additionally arranged on the left side and the right side of the door opening, the door opening reinforcing side columns are in transition connection with the bottom drum section, and the door opening reinforcing side columns on the two sides of the door opening and a door opening reinforcing cross beam above the door opening form a door-shaped frame; and the door opening in the bottom cylinder section of the prefabricated reinforced concrete tower cylinder is formed in the top surface of the hollow foundation of the wind turbine generator tower. Compared with the prior art, the door opening is directly formed in the top face of the concrete foundation column pier, and the reinforcing side columns and the reinforcing beams are formed by locally thickening the inner portion and the outer portion of the cylinder wall on the two sides and the upper portion of the door opening to make up weakening of the strength and rigidity of the cylinder wall by the door opening.

Description

Technical Field

[0001] The invention relates to the technical field of structural engineering, and in particular to a high-stability reinforcement method for a prefabricated assembled wind power generation concrete tower doorway. Background Art

[0002] The lower section of the prefabricated steel-concrete hybrid tower is a prefabricated reinforced concrete tower, and the upper section is a steel tower. The interior of the tower is equipped with ladders for up and down traffic and cables for transmitting electrical energy, so a door opening needs to be opened at the bottom of the tower. Due to the limitations of transportation conditions and lifting equipment, the height of the prefabricated reinforced concrete tower section is usually between 3m and 3.6m, while the height of the door opening of a large megawatt wind turbine is generally between 2m and 2.2m. Common door openings are generally opened in the middle of the section, so the distance between the upper edge of the door opening and the transverse joint and the distance between the lower edge and the top surface of the foundation are relatively small ( Figure 1 ). The opening of the doorway on the tower changes the original continuous and uniform stress state of the tower. When the wind turbine is running, stress concentration will occur in the area around the doorway under the action of various complex loads, resulting in cracks. Usually, designers will add hidden beams above and below the doorway for reinforcement. However, due to the height limitation of the bottom section tower and the minimum height requirement of the doorway, the distance between the upper edge of the doorway and the transverse seam and the distance between the lower edge of the doorway and the top surface of the foundation are relatively small, and the smallest is even only 400mm. The diameter of the bottom section tower is generally around 7m-10m, and the width of the doorway is generally around 0.8m-1.2m. The width of the doorway of a large megawatt wind turbine generally requires 1.2m. Therefore, designers have taken a series of measures to strengthen the periphery of the doorway, such as various forms of reinforcement of the steel door frame, reliable connection of the welded studs on the steel door frame with the concrete around the doorway, and strengthening the reinforcement around the doorway to form hidden beams and hidden columns. However, since the thickness of the concrete tower is generally 240-350mm, and the thickness of the steel door frame is generally around 20mm, the rigidity of the steel door frame is relatively weak compared to the weakening of the door opening. Finite element analysis found that the role of the steel door frame in reinforcing the door opening is very limited. Therefore, many cracks appeared in the concrete around the door opening in the actual project. Once the cracks appear and continue to expand, they will reduce the durability of the concrete, making it easier for water vapor and harmful chemicals to penetrate into the concrete, corroding the internal steel bars and other components, and weakening the overall performance of the structure.

[0003] Therefore, there is an urgent need for a highly stable reinforcement method for the door opening of a prefabricated assembled wind power concrete tower to reinforce the weakened portion of the door opening, thereby inhibiting the generation and development of concrete cracks around the door opening. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a highly stable reinforcement method for the door opening of prefabricated and assembled concrete towers for wind power generation. Reinforced columns (door opening reinforcement side columns) and reinforced beams (door opening reinforcement beams) connected to the tower walls are arranged on both sides and above the door opening. The reinforced section of the reinforced column is basically the same as the weakened door opening section. The thickness of the reinforced beam and the tower wall is smoothly transitioned through a conical surface to form a door-shaped frame with greater rigidity to restrain the deformation of the door opening. Through the implementation of this reinforcement measure, the weakened part of the door opening can be effectively reinforced, thereby suppressing the generation and development of concrete cracks around the door opening.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The object of the present invention is to provide a high-stability reinforcement method for a prefabricated assembled wind power generation concrete tower doorway, the reinforcement method comprising the following steps:

[0007] S1. A bottom section of a prefabricated reinforced concrete tower is manufactured in a factory. The two sides of a door opening on the bottom section of the prefabricated reinforced concrete tower are parallel to each other to facilitate the opening and closing of the door. A door opening reinforcement beam is arranged above the door opening. The cross-sectional width of the door opening reinforcement beam is increased by convexly extending toward the inner side and the outer side of the tower. The door opening reinforcement beam is transitionally connected to the bottom section.

[0008] S2. Add door opening reinforcement side columns protruding toward the inner side and the outer side of the tower tube on the left and right sides of the door opening, the door opening reinforcement side columns are transitionally connected with the bottom tube section, and the door opening reinforcement side columns on both sides of the door opening and the door opening reinforcement cross beam above the door opening form a door-shaped frame to obtain the bottom tube section of the unassembled prefabricated reinforced concrete tower tube;

[0009] S3. On site, the unassembled (not assembled on site) bottom cylinder section is assembled, the door opening on the bottom cylinder section of the prefabricated assembled reinforced concrete tower is opened on the top surface of the hollow foundation of the wind turbine tower, and the door opening reinforcement side column is directly placed on the top surface of the hollow foundation column pier of the wind turbine tower.

[0010] Furthermore, in step S1, the door opening reinforcement beam and the bottom cylinder section are connected by a tapered surface with a smooth transition.

[0011] Furthermore, in step S2, the door opening reinforcement side column and the bottom cylinder section are connected by a smooth transition of a conical surface.

[0012] Furthermore, before step S3, the following step is also included: manufacturing other cylinder sections of the prefabricated assembled reinforced concrete tower cylinder, the other cylinder sections being cylinder sections above the bottom cylinder section.

[0013] Furthermore, after step S3, other cylinder sections of the prefabricated assembled reinforced concrete tower cylinder are assembled together with the bottom cylinder section on site.

[0014] Furthermore, in step S3, during on-site assembly, the bottom cylinder section of the prefabricated assembled reinforced concrete tower is connected to the upper cylinder section via a cylinder section transverse joint; the cylinder section transverse joint is provided above the door opening; the door opening reinforcing cross beam expands downward from the cylinder section transverse joint above the door opening.

[0015] Furthermore, a cylinder segment vertical seam is provided on the cylinder segment above the bottom cylinder segment of the prefabricated assembled reinforced concrete tower; the cylinder segment vertical seam is staggered with the door opening in the vertical direction.

[0016] Furthermore, the vertical seams of the segments of the bottom cylinder section are staggered with the vertical seams of the cylinder section in the vertical direction, and the door opening reinforcement side columns and the door opening reinforcement cross beams are on the same segment.

[0017] Furthermore, the prefabricated reinforced concrete tower is provided with steel strands; the steel strands are distributed circumferentially along the tower wall of the prefabricated reinforced concrete tower.

[0018] Furthermore, in step S2, the reinforced cross-section of the door opening reinforcement side column is substantially the same as the weakened door opening cross-section.

[0019] Furthermore, in step S1, the width of the cross section of the door opening reinforcement beam protruding toward the inner side of the tower is the same as that of the cross section protruding toward the outer side of the tower; in step S2, the width of the cross section of the door opening reinforcement side column protruding toward the inner side of the tower is the same as that of the cross section protruding toward the outer side of the tower.

[0020] Furthermore, the tower door is connected to the embedded parts on the side of the door opening by bolts.

[0021] Furthermore, after obtaining the prefabricated assembled wind power generation concrete tower doorway, a movable or fixed threshold is set and waterproofing is performed.

[0022] Furthermore, the height of the prefabricated reinforced concrete tower section is usually between 3m and 3.6m.

[0023] Furthermore, the diameter of the bottom tube section is generally about 7m-10m; the width of the door opening is generally about 0.8m-1.2m; and the thickness of the prefabricated reinforced concrete tower tube is generally 240-350mm.

[0024] Furthermore, the height of the door opening reinforcement beam should be made as high as possible while meeting the door opening height and the bottom tube section transportation conditions.

[0025] Furthermore, the diameter of the upper side of the bottom cylinder section is smaller than the diameter of the lower side, and the diameter of the bottom cylinder section gradually increases from top to bottom.

[0026] Furthermore, the prefabricated reinforced concrete tower is prefabricated in a factory and assembled on site.

[0027] Furthermore, the door opening reinforcement side columns on both sides of the door opening and the door opening reinforcement cross beams above the door opening form a door-shaped frame through a template, and the process is prefabricated in a factory.

[0028] Furthermore, the prefabrication process includes: 1. mold making, determining the design size and shape of the prefabricated assembled reinforced concrete tower, and making a matching mold; 2. concrete pouring, pouring concrete into the mold; 3. maintenance; 4. mold removal, when the concrete reaches the design strength, the mold is removed to obtain the unassembled parts of the prefabricated assembled reinforced concrete tower.

[0029] Furthermore, step S3 is performed on site, and the specific process is: assembling the segments of the bottom barrel section of the prefabricated reinforced concrete tower into a whole ring on the tooling next to the machine position, and then using a crane to hoist the assembled bottom barrel section to the top surface of the hollow foundation of the wind turbine tower.

[0030] The present invention is to directly open the door opening on the bottom cylinder section of the prefabricated assembled reinforced concrete tower tube on the top surface of the hollow foundation of the wind turbine tower frame. The two sides of the door opening are parallel to each other, which is convenient for opening and closing the door. The main purpose is to increase the distance between the upper edge and the horizontal seam of the cylinder section, increase the height and rigidity of the hidden beam above the door opening, that is, the door opening reinforcement beam, and increase the cross-sectional width of the door opening reinforcement beam by convexly protruding to the inside and outside of the cylinder wall. The left and right sides of the door opening are additionally provided with door opening reinforcement side columns convexly protruding to the inside and outside of the cylinder wall, and the size of the door opening reinforcement side columns is determined according to calculation. The door opening reinforcement side columns on both sides of the door opening and the door opening reinforcement beam above the door opening form a door-shaped frame with great rigidity, so that the force of the upper cylinder section can be smoothly transmitted to the concrete around the door opening through the door-shaped frame, thereby alleviating the stress concentration phenomenon around the door opening. Through a large number of finite element analyses, the effectiveness of the reinforcement scheme has been fully verified.

[0031] In the present invention, the door opening reinforcing side columns on both sides of the door opening and the door opening reinforcing cross beam above the door opening both protrude into and out of the tube at the same time, the sizes of the door opening reinforcing side columns and the door opening reinforcing cross beam and their reinforcement are determined according to calculations, the transition surfaces between the tube wall and the door opening reinforcing cross beam and the door opening reinforcing side columns are relatively smooth and are all planes, the door-shaped frame has a strong and powerful appearance, uniform internal and external rigidity, and is convenient for template processing and production.

[0032] In the present invention, there is no need to arrange a traditional steel door frame with bolts at the door opening, and the weakening of the door opening is reinforced by the door opening reinforcement side columns and the door opening reinforcement cross beams.

[0033] Furthermore, the height of the door opening reinforcement beam above the door opening is increased by disconnecting the lower part of the door opening and directly placing the door opening reinforcement side column on the top surface of the foundation column pier.

[0034] Furthermore, the door opening reinforcement side columns and the door opening reinforcement cross beams are convex to the inside and outside of the tower tube at the same time to increase the cross section, and the rigidity inside and outside is uniform. The transition surfaces between the door opening reinforcement side columns and the door opening reinforcement cross beams and the tube wall are all planes.

[0035] The present invention also provides a door opening for a prefabricated and assembled wind power concrete tower, the door opening is used for a prefabricated and assembled wind power concrete tower, the prefabricated and assembled wind power concrete tower includes a bottom cylinder section, the door opening is connected to the bottom cylinder section, the inner side of the prefabricated and assembled wind power concrete tower is the inner side of the tower, and the outer side of the prefabricated and assembled wind power concrete tower is the outer side of the tower, the door opening includes door opening reinforcement side columns and door opening reinforcement beams; the door opening reinforcement beams are arranged above the door opening; the door opening reinforcement side columns are arranged on the left and right sides of the door opening; the door opening reinforcement beams protrude toward the inner side of the tower and the outer side of the tower; the door opening reinforcement side columns protrude toward the inner side of the tower and the outer side of the tower.

[0036] Furthermore, the width of the cross section of the door opening reinforcement beam protruding toward the inner side of the tower tube is the same as the width of the cross section protruding toward the outer side of the tower tube.

[0037] Furthermore, the width of the cross section of the door opening reinforcement side column protruding toward the inner side of the tower tube is the same as the width of the cross section protruding toward the outer side of the tower tube.

[0038] Furthermore, the door opening reinforcement cross beam is connected to the bottom cylinder section through a tapered surface with a smooth transition; the door opening reinforcement side column is connected to the bottom cylinder section through a tapered surface with a smooth transition.

[0039] Furthermore, the door opening reinforcement cross beam is smoothly transitionally connected to the door opening reinforcement side column.

[0040] The present invention also provides a prefabricated assembled wind power concrete tower, which includes a prefabricated assembled wind power concrete tower barrel; the prefabricated assembled wind power concrete tower barrel includes a door opening and a bottom barrel section as described in any one of claims 1 to 3; the door opening and the bottom barrel section are connected by door opening reinforcement side columns and door opening reinforcement cross beams.

[0041] Furthermore, the prefabricated assembled wind power generation concrete tower also includes an upper cylinder section, and the upper cylinder section is arranged above the bottom cylinder section;

[0042] The upper cylinder section and the bottom cylinder section are connected via a cylinder section transverse seam.

[0043] Furthermore, the upper cylinder segment comprises upper cylinder segment pieces, and the upper cylinder segment pieces of the same height are stacked along the height direction after being circumferentially spliced ​​through cylinder segment vertical seams; the cylinder segment vertical seams are staggered with the door opening in the vertical direction.

[0044] Furthermore, the door opening reinforcement beam expands downward from the transverse seam of the cylinder section above the door opening.

[0045] Furthermore, the prefabricated reinforced concrete tower is provided with steel strands; the steel strands are distributed circumferentially along the tower wall of the prefabricated reinforced concrete tower.

[0046] Furthermore, the prefabricated and assembled wind power generation concrete tower also includes a wind turbine tower hollow foundation; the door opening of the prefabricated and assembled reinforced concrete tower is arranged on the top surface of the wind turbine tower hollow foundation.

[0047] Furthermore, the wind turbine tower hollow foundation includes a column pier; the door opening reinforcement side column falls on the top surface of the column pier of the wind turbine tower hollow foundation.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] 1) The technical solution provides a highly stable reinforcement method for the door opening of a prefabricated assembled wind power concrete tower. The lower part of the door opening is disconnected, and the door opening reinforcement side columns fall directly on the top surface of the hollow foundation column pier of the wind turbine tower, which solves the common concrete cracking problem under the conventional door opening and increases the height and rigidity of the door opening reinforcement beam.

[0050] 2) The technical solution provides a highly stable reinforcement method for the door opening of a prefabricated assembled wind power concrete tower. The door opening reinforcement side columns and door opening reinforcement beams form a door-shaped frame with high rigidity, which effectively solves the problems of force transmission and stress concentration around the door opening.

[0051] 3) The technical solution provides a highly stable reinforcement method for the door opening of a prefabricated and assembled wind power concrete tower. The door opening reinforcement side columns on both sides of the door opening and the door opening reinforcement beams above the door opening both protrude inside and outside the tube at the same time. The internal and external stiffness is uniform and the force-bearing performance is excellent, so the stability is high and cracking is not easy to occur.

[0052] 4) The technical solution provides a highly stable reinforcement method for the door opening of a prefabricated assembled wind power concrete tower. The transition surfaces between the door opening reinforcement side columns and door opening reinforcement beams and the wall of the bottom section tower (bottom section) are all flat, and the template processing and manufacturing are convenient.

[0053] 5) The technical solution provides a high-stability reinforcement method for the door opening of a prefabricated and assembled concrete wind power tower, which is achieved by arranging reinforcing columns (door opening reinforcing side columns) and reinforcing beams (door opening reinforcing beams) that are integrated with the tower wall on both sides and above the door opening. The reinforced cross-section of the reinforcing column is basically the same as the weakened door opening cross-section, and the thickness of the reinforcing beam and the tower wall is smoothly transitioned through a conical surface to form a door-shaped frame with greater rigidity, thereby restraining the deformation of the door opening. Through the implementation of this reinforcement measure, the weakened portion of the door opening can be effectively reinforced, thereby suppressing the generation and development of concrete cracks around the door opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a schematic diagram of common tower gate practices.

[0055] Figure 2 The present invention is a schematic diagram of the connection between a prefabricated reinforced concrete tower and a wind turbine tower hollow foundation for the method of reinforcing a door opening of a prefabricated wind power generation concrete tower with high stability.

[0056] Figure 3 for Figure 2 Section 1-1 in the figure.

[0057] Figure 4 for Figure 2 Section 2-2 in .

[0058] Figure 5 Schematic diagram of the three-dimensional structure of the bottom cylinder section in the present invention.

[0059] Figure 6 for Figure 4 Section 3-3 in .

[0060] Figure 7 Finite element analysis (ABAQUS software) calculation of the door opening for comparison Figure 1 .

[0061] Figure 8 Finite element analysis (ABAQUS software) calculation of the door opening for comparison Figure 2 .

[0062] Fig. 9 Finite element analysis (ABAQUS software) calculation of the door opening for comparison Figure 3 .

[0063] Fig.10 Finite element analysis (ABAQUS software) calculation of the door opening of Example 1 Figure 1 .

[0064] Fig.11 Finite element analysis (ABAQUS software) calculation of the door opening of Example 1 Figure 2 .

[0065] Numbers in the figure:

[0066] 1. Prefabricated reinforced concrete tower, 2. Hollow foundation of wind turbine tower, 3. Bottom cylinder section, 4. Door opening, 5. Door opening reinforced side column, 6. Door opening reinforced cross beam, 7. Outside of tower, 8. Inside of tower, 9. Horizontal joint of cylinder section, 10. Vertical joint of cylinder section, 11. Steel strand. DETAILED DESCRIPTION

[0067] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms and other features not clearly described in this technical solution are all considered to be common technical features disclosed in the prior art.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] It should be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0070] The present invention is further described in detail below in conjunction with specific embodiments.

[0071] Example 1

[0072] like Figures 1 to 6 As shown, this embodiment provides a high-stability reinforcement method for a prefabricated assembled wind power generation concrete tower doorway, the reinforcement method comprising the following steps:

[0073] S1. The bottom cylinder section 3 of the prefabricated reinforced concrete tower 1 is manufactured in a factory. The two sides of the door opening 4 on the bottom cylinder section 3 of the prefabricated reinforced concrete tower 1 are parallel to each other to facilitate the opening and closing of the door. A door opening reinforcement beam 6 is arranged above the door opening 4. The cross-sectional width of the door opening reinforcement beam 6 is increased by protruding toward the inner side 8 of the tower and protruding toward the outer side 7 of the tower. The door opening reinforcement beam 6 is connected to the bottom cylinder section 3 through a smooth transition of a conical surface. The reinforcement cross section of the door opening reinforcement side column 5 is substantially the same as the weakened door opening cross section, wherein the cross section of the door opening reinforcement beam 6 protruding toward the inner side 8 of the tower and the cross section of the door opening reinforcement beam 6 protruding toward the outer side 7 of the tower are the same in width;

[0074] S2, the left and right sides of the door opening 4 are additionally provided with door opening reinforcement side columns 5 protruding toward the inner side 8 of the tower tube and the outer side 7 of the tower tube, wherein the cross section of the door opening reinforcement side column 5 protruding toward the inner side 8 of the tower tube and the cross section of the door opening reinforcement side column 5 protruding toward the outer side 7 of the tower tube have the same width, the door opening reinforcement side column 5 is connected to the bottom tube section 3 through a smooth transition of the conical surface, the door opening reinforcement side columns 5 on both sides of the door opening 4 and the door opening reinforcement cross beam 6 above the door opening 4 form a door-shaped frame, and the bottom tube section 3 of the unassembled prefabricated reinforced concrete tower tube 1 is obtained;

[0075] S3, manufacturing other cylinder sections of the prefabricated assembled reinforced concrete tower cylinder 1 in a factory, wherein the other cylinder sections are cylinder sections above the bottom cylinder section 3;

[0076] S4, assembling the prefabricated reinforced concrete tower 1 on site, opening the door opening 4 on the bottom section 3 of the prefabricated reinforced concrete tower 1 on the top surface of the wind turbine tower hollow foundation 2, and placing the door opening reinforcement side column 5 directly on the top surface of the column pier of the wind turbine tower hollow foundation 2;

[0077] S5. Assemble the other cylinder sections of the prefabricated reinforced concrete tower cylinder 1 and the bottom cylinder section 3 together on site.

[0078] The bottom cylinder section 3 of the prefabricated reinforced concrete tower 1 is connected to the upper cylinder section through a cylinder section transverse joint 9; the cylinder section transverse joint 9 is arranged above the door opening 4; the door opening reinforcement beam 6 expands downward from the cylinder section transverse joint 9 above the door opening 4.

[0079] A cylinder segment vertical seam 10 is provided on the cylinder segment above the bottom cylinder segment 3 of the prefabricated assembled reinforced concrete tower 1; the cylinder segment vertical seam 10 is staggered with the door opening 4 in the vertical direction.

[0080] The vertical seams of the segments of the bottom cylinder section 3 are staggered with the vertical seams 10 of the cylinder section in the vertical direction, and the door opening reinforcement side columns 5 and the door opening reinforcement cross beams 6 are on the same segment.

[0081] The prefabricated reinforced concrete tower 1 is provided with steel strands 11 ; the steel strands 11 are distributed along the circumference of the tower wall of the prefabricated reinforced concrete tower 1 .

[0082] The tower door is connected to the embedded parts on the side of the door opening 4 by bolts, and the steel plate of the embedded parts can be fixed to the side of the door opening by anchoring into the concrete anchor bars of the bottom cylinder section.

[0083] The diameter of the bottom barrel section 3 is generally about 7m-10m; the width of the door opening 4 is generally about 0.8m-1.2m; the thickness of the prefabricated reinforced concrete tower 1 is generally 240-350mm. The diameter of the upper side of the bottom barrel section 3 is smaller than the diameter of the lower side, and the diameter of the bottom barrel section 3 gradually increases from top to bottom. The prefabricated reinforced concrete tower 1 is prefabricated in the factory and assembled on site.

[0084] The door opening reinforcement side columns 5 on both sides of the door opening 4 and the door opening reinforcement cross beam 6 above the door opening 4 form a door-shaped frame through a template, and the process is prefabricated in a factory.

[0085] The prefabrication process includes: 1. mold making, determining the design size and shape of the prefabricated assembled reinforced concrete tower 1, and making a matching mold; 2. concrete pouring, pouring concrete into the mold; 3. maintenance; 4. mold removal, when the concrete reaches the design strength, the mold is removed to obtain the unassembled parts of the prefabricated assembled reinforced concrete tower 1.

[0086] Step S4 is performed on site, and the specific process is: assemble the various segments of the bottom barrel section 3 of the prefabricated assembled reinforced concrete tower 1 into a complete ring on the tooling next to the machine position, and then use a crane to hoist the assembled bottom barrel section 3 to the top surface of the hollow foundation 2 of the wind turbine tower.

[0087] The present embodiment further provides a door opening for a prefabricated and assembled concrete tower for wind power generation, wherein the door opening for a prefabricated and assembled concrete tower for wind power generation is the door opening 4, and the door opening 4 includes a door opening reinforcement side column 5 and a door opening reinforcement cross beam 6, the door opening reinforcement cross beam 6 is arranged above the door opening 4, and the door opening reinforcement side column 5 is arranged on the left and right sides of the door opening 4, the door opening reinforcement cross beam 6 protrudes toward the inner side 8 of the tower and the outer side 7 of the tower, and the door opening reinforcement side column 5 protrudes toward the inner side 8 of the tower and the outer side 7 of the tower, wherein the cross section of the door opening reinforcement cross beam 6 protruding toward the inner side 8 of the tower and the cross section protruding toward the outer side 7 of the tower are the same in width, wherein the cross section of the door opening reinforcement side column 5 protruding toward the inner side 8 of the tower and the cross section protruding toward the outer side 7 of the tower are the same in width.

[0088] This embodiment further provides a prefabricated assembled wind power generation concrete tower including a door opening, the prefabricated assembled wind power generation concrete tower 1 also includes a bottom barrel section 3 and an upper barrel section connected to the bottom barrel section 3 through a barrel section transverse seam 9; a barrel section vertical seam 10 is provided on the upper barrel section above the bottom barrel section 3; the barrel section vertical seam 10 is staggered with the door opening 4 in the vertical direction; a steel strand 11 is provided on the prefabricated assembled reinforced concrete tower 1; the steel strand 11 is distributed along the circumferential direction of the tower wall of the prefabricated assembled reinforced concrete tower 1; the steel strand 11 is connected to the upper barrel section, the bottom barrel section 3, and the wind turbine tower hollow foundation 2 in sequence from top to bottom. The door opening 4 on the bottom barrel section 3 of the prefabricated assembled reinforced concrete tower 1 is arranged on the top surface of the wind turbine tower hollow foundation 2, the two sides of the door opening 4 are parallel to each other, which is convenient for the opening and closing of the door, and the door opening reinforcement side column 5 is arranged on the top surface of the column pier of the wind turbine tower hollow foundation 2.

[0089] The door opening 4 for the prefabricated assembled wind power concrete tower provided by the present invention falls directly on the top surface of the column pier of the hollow foundation 2 of the wind turbine tower. In the specific implementation, it is recommended that the vertical seam 10 of the cylinder section of the door opening 4 avoids the top of the door opening 4 to ensure that the upper cylinder section within the door opening 4 has sufficient rigidity. The segmentation of the bottom cylinder section 3 should avoid the position of the vertical seam 10 of the cylinder section and consider the arrangement of the steel strands 11. The door opening reinforcement side column 5 and the door opening reinforcement cross beam 6 should be in the same segment. The reinforced side column 5 and the door opening reinforcement cross beam 6 are simultaneously protruded toward the inside and outside of the tower to increase the cross section. The transition thickening and widening parts of the reinforced side column 5 and the door opening reinforcement cross beam 6 with the cylinder wall are all planes ( Figure 5 The door opening reinforcement beam 6 starts to expand downward from the horizontal joint 9 of the cylinder section above the door opening 4 ( Figure 6 The left and right sides of the door opening 4 are parallel surfaces, and the tower door (not shown) is connected to the embedded parts on the side of the door opening 4 by bolts.

[0090] The present invention is to directly open the door opening 4 on the bottom section 3 of the prefabricated reinforced concrete tower 1 on the top surface of the hollow foundation 2 of the wind turbine tower, and the two sides of the door opening 4 are parallel to each other, which is convenient for opening and closing the door ( Figure 2 ), the main purpose is to increase the distance between the upper edge 4 and the horizontal seam 9 of the cylinder section, increase the height and rigidity of the hidden beam above the door opening, that is, the door opening reinforcement beam 6, and increase the cross-sectional width of the door opening reinforcement beam 6 by convexly extending to the inner and outer sides of the cylinder wall ( Figure 3 ). Door opening reinforcement side columns 5 are added on the left and right sides of the door opening 4 to protrude toward the inner and outer sides of the cylinder wall. The size of the door opening reinforcement side columns 5 is determined according to calculation ( Figure 4 The door opening reinforcement side columns 5 on both sides of the door opening and the door opening reinforcement beam 6 above the door opening form a door-shaped frame with great rigidity ( Figure 5 ), so that the force of the upper cylinder section can be smoothly transmitted to the concrete around the door opening 4 through the door frame, alleviating the stress concentration around the door opening. The effectiveness of this reinforcement scheme has been fully verified through a large number of finite element analyses.

[0091] In the present invention, the door opening reinforcement side columns 5 on both sides of the door opening 4 and the door opening reinforcement cross beam 6 above the door opening both protrude into and out of the tube at the same time, the size of the door opening reinforcement side columns 5 and the door opening reinforcement cross beam 6 and their reinforcement are determined according to calculations, and the transition surfaces between the tube wall and the door opening reinforcement cross beam 6 and the door opening reinforcement side columns 5 are relatively gentle and are all planes ( Figure 6 ), the door-type frame has a strong and powerful appearance, uniform rigidity inside and outside, and is easy to process and manufacture.

[0092] Example 2

[0093] This embodiment provides a high-stability reinforcement method for a prefabricated assembled wind power generation concrete tower doorway, which, based on Embodiment 1, further includes the following configurations:

[0094] After step S2, a movable or fixed threshold is set and waterproofed.

[0095] Comparative Example

[0096] The present comparative example provides a highly stable reinforcement method for the door opening of a prefabricated assembled wind power concrete tower. In the present comparative example, in order to compensate for the lack of the opening, the reinforcing column protrudes inwardly into the tower, and the connection between the protruding reinforcing column and the bottom tube section is abrupt (the sum of the cross-section protruding toward the inner side 8 of the tower and the cross-section protruding toward the outer side 7 of the tower in Example 1 is the same as the width of the inwardly protruding cross-section of the reinforcing column in the present comparative example, and other dimensions are basically the same as those in Example 1).

[0097] Calculation was performed for the structures of Example 1 and the comparative example. Figures 6 to 9 ) The force transmission at the variable cross-section can only be transmitted along the diffusion angle. The cone section needs to extend to the door opening. The door opening suddenly thickens, and the force transmission is not smooth, resulting in unfavorable force above the door opening and frequent cracks below. Example 1 (such as Figures 9-11 ) The inside and outside of the tube and the left and right sides of the door opening transition at the same time, and the force transmission is very smooth. In terms of design, the door opening reinforcement side column 5 and the door opening reinforcement cross beam 6 only need to make up for the missing area of ​​the opening. In addition, the door opening reinforcement side column 5 and the door opening reinforcement cross beam 6 of Example 1 are gradual, and are connected to the bottom tube section 3 through a tapered surface with a gentle transition. As shown in the figure, in the structure of the comparative example, stress concentration occurs on the side above the door opening 4 facing the outside of the tube, and the force is unfavorable. In Example 1, the force around the entire door opening 4 is relatively uniform, without obvious stress concentration, uniform internal and external stiffness, excellent force performance, and thus high stability and not prone to cracking.

[0098] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A high-stability reinforcement method for a prefabricated wind power generation concrete tower doorway, characterized in that: The strengthening method comprises the following steps: A bottom barrel section (3) of a prefabricated assembled reinforced concrete tower (1) is manufactured, wherein two sides of a door opening (4) on the bottom barrel section (3) of the prefabricated assembled reinforced concrete tower (1) are parallel to each other, a door opening reinforcement beam (6) is arranged above the door opening (4), and the cross-sectional width of the door opening reinforcement beam (6) is increased by protruding toward the inner side (8) of the tower and protruding toward the outer side (7) of the tower, and the door opening reinforcement beam (6) is transitionally connected to the bottom barrel section (3); On the left and right sides of the door opening (4), door opening reinforcement side columns (5) protruding toward the inner side (8) of the tower tube and the outer side (7) of the tower tube are added, the door opening reinforcement side columns (5) are transitionally connected with the bottom tube section (3), the door opening reinforcement side columns (5) on both sides of the door opening (4) and the door opening reinforcement cross beam (6) above the door opening (4) form a door-shaped frame, and the bottom tube section (3) of the unassembled prefabricated reinforced concrete tower tube (1) is obtained; The bottom cylinder section (3) of the unassembled prefabricated reinforced concrete tower (1) is assembled, the door opening (4) on the bottom cylinder section (3) is opened on the top surface of the wind turbine tower hollow foundation (2), and the door opening reinforcement side column (5) is placed on the top surface of the column pier of the wind turbine tower hollow foundation (2).

2. A high-stability reinforcement method for a prefabricated wind power generation concrete tower doorway according to claim 1, characterized in that: The door opening reinforcement cross beam (6) is connected to the bottom cylinder section (3) through a tapered surface with a smooth transition; The door opening reinforcement side column (5) is connected to the bottom cylinder section (3) through a tapered surface with a smooth transition.

3. A high-stability reinforcement method for a prefabricated wind power generation concrete tower doorway according to claim 1, characterized in that: The bottom cylinder section (3) of the prefabricated assembled reinforced concrete tower cylinder (1) is connected to the upper cylinder section via a cylinder section transverse seam (9); The cylinder section transverse seam (9) is arranged above the door opening (4); The door opening reinforcement beam (6) expands downward from the cylinder section transverse seam (9) above the door opening (4).

4. A high-stability reinforcement method for a prefabricated wind power generation concrete tower doorway according to claim 1, characterized in that: A cylinder section vertical joint (10) is provided on the cylinder section above the bottom cylinder section (3) of the prefabricated assembled reinforced concrete tower cylinder (1); The cylinder section vertical seam (10) is staggered with the door opening (4) in the vertical direction.

5. A high-stability reinforcement method for a prefabricated wind power generation concrete tower doorway according to claim 4, characterized in that: The vertical seams of the segments of the bottom cylinder section (3) are staggered with the vertical seams of the cylinder section (10) in the vertical direction, and the door opening reinforcement side columns (5) and the door opening reinforcement cross beams (6) are on the same segment.

6. A high-stability reinforcement method for a prefabricated wind power generation concrete tower doorway according to claim 1, characterized in that: The prefabricated reinforced concrete tower (1) is provided with a steel strand (11); The steel strands (11) are distributed along the circumference of the tower wall of the prefabricated assembled reinforced concrete tower (1).

7. A high-stability reinforcement method for a prefabricated wind power generation concrete tower doorway according to claim 1, characterized in that: The reinforced cross section of the door opening reinforcement side column (5) is the same as the weakened door opening cross section.

8. A high-stability reinforcement method for a prefabricated wind power generation concrete tower doorway according to claim 1, characterized in that: The width of the cross section of the door opening reinforcement beam (6) protruding toward the inner side (8) of the tower tube is the same as the width of the cross section protruding toward the outer side (7) of the tower tube; The width of the cross section of the door opening reinforcement side column (5) protruding toward the inner side (8) of the tower tube is the same as the width of the cross section protruding toward the outer side (7) of the tower tube.

9. A high-stability reinforcement method for a prefabricated wind power generation concrete tower doorway according to claim 1, characterized in that: The door opening (4) is connected to the embedded parts on the bottom cylinder section (3) at the side of the door opening (4) through bolts.

10. A high-stability reinforcement method for a prefabricated wind power generation concrete tower doorway according to claim 1, characterized in that: After obtaining the prefabricated assembled wind power generation concrete tower doorway, a movable or fixed threshold is set and waterproofing is performed.

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