Wind power concrete tower drum connecting structure

Abstract

The utility model relates to a wind power concrete tower drum connecting structure, which is characterized in that for a plurality of tower drum sections, joint surfaces among the tower drum sections are provided with epoxy structural adhesive layers, wall surfaces of the joint surfaces of the tower drum sections are provided with heat tracing band arrangement grooves, and heat tracing bands are laid in the heat tracing band arrangement grooves; and electrifying interface positions which are communicated with the heat tracing band arrangement grooves and the inner and / or outer surfaces of the tower drum sections are also formed in the tower drum sections. Compared with the prior art, through the design of the reserved groove position at the top end of the tower drum, the precision of installing the heat tracing band on a construction site is improved, the heat tracing band is effectively prevented from being broken due to the high stress effect in the splicing process of tower drum sections, and it is guaranteed that the follow-up heating effect of the heat tracing band is even and stable.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation tower barrels, in particular to a connecting structure for a wind power concrete tower barrel. Background Technique

[0002] The wind power generation tower barrel is an important part of a wind power generation unit. In recent years, due to the characteristics of low engineering cost, good anti-corrosion performance, and excellent anti-fatigue performance of the concrete tower barrel, it has been more and more widely used in the field of wind power generation. The fan tower barrel is composed of multiple tower sections. According to different diameters, each section is composed of a whole ring or two or more pieces. After the construction of each section of the tower barrel is completed, prestress is applied to form an integral stress system for the fan tower barrel. The concrete tower barrel can be combined with the upper steel section, with adjustable working frequency, and is suitable for regions with low wind power and large wind shear index. It is one of the solutions for the tower body design of high hub wind turbines with high current technical maturity and large installed capacity.

[0003] Before the vertical splicing of the concrete tower barrel sections, epoxy structural adhesive needs to be applied at the joint of the tower barrel sections. After the epoxy structural adhesive cures to reach the strength requirement, an integral stress system is formed. However, in a low-temperature environment, there are problems such as slow curing speed of the epoxy structural adhesive used for tower barrel section connection and difficulty in meeting the strength standard of the tower barrel section connection nodes, which seriously reduce the construction speed of the concrete tower barrel and threaten the construction safety of the fan. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the defects of the above-mentioned existing technologies and provide a connecting structure for a wind power concrete tower barrel.

[0005] The purpose of the utility model can be realized by the following technical solutions:

[0006] A connecting structure for a wind power concrete tower barrel. For multiple tower barrel sections, an epoxy structural adhesive layer is provided on the joint surface between each tower barrel section.

[0007] On the wall surface of the connection seam of each tower barrel section, a heat tracing belt arrangement groove is provided, and a heat tracing belt is laid in the heat tracing belt arrangement groove;

[0008] An energizing interface position that connects the heat tracing belt arrangement groove with the inner and / or outer surface of the tower barrel section is also provided inside the tower barrel section.

[0009] As a preferred technical solution, multiple heat tracing belts and corresponding heat tracing belt arrangement grooves are arranged at the connection interface of the tower barrel sections.

[0010] As a preferred technical solution, the multiple heat tracing belts and corresponding heat tracing belt arrangement grooves arranged on the wall surface of the horizontal joint surface of the tower barrel section are arranged circumferentially along the tower barrel wall surface.

[0011] As a preferred technical solution, the multi-channel heating tapes arranged circumferentially along the tower barrel wall are arranged at equal intervals, or the arrangement interval of the heating tapes near the outer side of the tower barrel is smaller than that of the heating tapes near the inner side of the tower barrel.

[0012] As a preferred technical solution, the heating tapes are arranged in an S shape along the wall surface of the horizontal joint surface.

[0013] As a preferred technical solution, the tower barrel segments have the same diameter or a variable diameter along the vertical axis direction of the tower body.

[0014] As a preferred technical solution, when the diameter of the tower barrel is smaller than the set threshold value, the tower barrel segment is a whole-ring structure; when the diameter of the tower barrel is larger than the set threshold value, the tower barrel segment adopts a segmented structure of two or more segments.

[0015] As a preferred technical solution, for the tower barrel segment adopting a segmented structure, an epoxy structural adhesive layer and a heating tape arrangement groove are provided along the vertical connection surface of each segment, and heating tapes are arranged in the heating tape arrangement groove.

[0016] As a preferred technical solution, the distance between the grooves of multiple arrangement grooves on the same wall surface is not less than 50 mm.

[0017] As a preferred technical solution, the distance from the arrangement groove to the wall surface is not less than 20 mm.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1) Through the design of the reserved slot at the top of the tower barrel, the utility model improves the installation accuracy of the heating tapes at the construction site, effectively avoids the fracture of the heating tapes caused by high stress during the splicing process of the tower barrel segments, and ensures the uniform and stable heating effect of the subsequent heating tapes.

[0020] 2) The utility model uses the heating tapes to heat the structural adhesive, improves the curing speed of the structural adhesive between the tower segments in a low-temperature environment, improves the construction efficiency, and saves the construction period.

[0021] 3) The connection structure scheme between the tower segments of the utility model is reasonable, effectively solves the problems of the failure of the connection strength between the tower segments and the slow curing speed in a low-temperature environment, and improves the construction quality and efficiency of the wind power concrete tower barrel segments in a low-temperature environment. Description of the Drawings

[0022] Figure 1 It is a sectional view of the concrete tower barrel connection structure;

[0023] Figure 2 It is a sectional view of the lower barrel segment of the concrete tower barrel;

[0024] Figure 3 It is a schematic diagram of the concrete tower barrel segment;

[0025] Figure 4 It is a partial enlarged view of the upper edge structure of the concrete tower barrel segment;

[0026] Figure 5 It is a schematic diagram of the vertical assembly of the concrete tower barrel segment;

[0027] As shown by the reference numerals in the figure: 1. The upper segment of the concrete tower barrel; 2. The lower segment of the concrete tower barrel; 3. The epoxy structural adhesive layer; 4. The heating tape; 5. The heating tape layout groove; 6. The horizontal joint surface. Specific implementation mode

[0028] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present utility model, and gives the detailed implementation mode and specific operation process, but the protection scope of the present utility model is not limited to the following embodiments.

[0029] It should be noted that: Similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] Some implementation modes of the present utility model will be described in detail below in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0031] Embodiment 1

[0032] The purpose of the present utility model is to provide a connection interface structure for the tower segments of a wind power concrete tower barrel in a low-temperature environment. By designing tower slices with reserved slots and laying heating tapes, it is used to solve the problems of slow curing speed of cementitious materials and derived quality problems at low temperatures, and at the same time avoid the heating tapes being crushed by the upper ring slices, affecting the heating effect, so as to realize the rapid construction of wind power concrete tower barrels in a low-temperature environment. By energizing the heating tapes to heat, the internal temperature of the structural adhesive layer is increased, the curing speed is accelerated, and the joint of the tower segments quickly reaches the design strength requirements, ensuring the construction quality and speed.

[0033] As Figure 1 shown, the connection interface structure for the tower segments of a wind power concrete tower barrel proposed by the present utility model includes concrete tower barrel slices with reserved heating tape layout grooves 5 at the ends, which are horizontally spliced and combined into an upper segment 1 of a concrete tower barrel, and the lower segment 2 of the concrete tower barrel is made in the same way, as Figure 2As shown, a heating cable 4 is laid on the horizontal joint surface 6 between concrete tower barrel segments. The splicing of the tower barrel segments is completed by on-site hoisting. After the barrel segment is hoisted to the predetermined position, an epoxy structural adhesive layer 3 for connection is applied, and the heating cable at the connection interface of the tower segment is electrified for heating. After the splicing of the barrel segment is completed and the strength of the tower segment connection layer reaches the standard, the power supply to the heating cable is cut off to stop heating, and prestress is applied to make the concrete tower barrel segments form a stressed whole. The connection structure with a heating cable and a reserved slot used in the present utility model has a reasonable design, reliable effect, is convenient for production and construction, can improve the construction quality and speed of the concrete wind turbine tower barrel in a low-temperature environment, and has good technical and economic advantages.

[0034] The present utility model also has the following optional features:

[0035] Optionally, as Figures 3 - 4 shown, multiple heating cables can be arranged on the connection interface of the tower segment according to the on-site environment and actual heating effect, and a groove for laying the heating cable is provided at the top of the tower barrel segment.

[0036] Optionally, the heating cable layout scheme at the connection interface of the tower segment can be arranged in an S shape or circumferentially along the wall surface, and a groove for laying the heating cable is provided at the top of the tower barrel segment.

[0037] Optionally, when the heating cable is arranged circumferentially, it can be arranged at equal intervals; it can also be arranged at unequal intervals, with the heating cables arranged more densely near the outer side of the tower barrel.

[0038] Optionally, a haunch structure is provided at the end of the tower barrel segment, and an additional groove for laying the heating cable is provided at the top.

[0039] Optionally, the tower barrel segments are in the form of equal diameter or variable diameter along the vertical axis direction of the tower body.

[0040] Optionally, the material of the internal resistance wire of the heating cable should be a material with a high resistivity and a low linear expansion coefficient.

[0041] Optionally, when the diameter of the tower barrel is small, it is made as a whole ring, and a groove for laying the heating cable is provided at the upper edge of the barrel segment.

[0042] Optionally, when the diameter of the tower barrel is greater than a preset diameter threshold, a two-piece or more piecewise method is adopted.

[0043] Furthermore, for the tower barrel segments with a segmented structure, an epoxy structural adhesive layer 3 and a heating cable layout groove 5 are provided along the vertical connection surface of each segment, and a heating cable 4 is arranged in the heating cable layout groove 5.

[0044] The following will illustrate the specific implementation application process of the connection structure at the tower segment of the wind power concrete tower barrel in the above-mentioned low-temperature environment:

[0045] As Figure 1As shown in the figure, the structure at the joint of the tower barrel segments includes the upper concrete tower barrel segment 1 with a reserved heating tape layout groove 5 engraved at the end, and the lower concrete tower barrel segment 2 is made in the same way. A heating tape 4 is laid on the horizontal joint surface 6 between the concrete tower barrel segments. The splicing of the tower barrel segments is completed by on-site hoisting. An epoxy structural adhesive layer 3 for connection is applied and the heating tape at the joint interface of the tower segments is powered on for heating. After the strength of the joint interface of the tower segments reaches the standard, the power supply to the heating tape is cut off to stop heating, and prestress is applied to make the concrete tower barrel segments form a stressed whole.

[0046] The general parameters selected for the heating tape are as follows: width 14mm, thickness 3mm, rated voltage of 220V, nominal power of 25W / m (65°C), and it has the function of self-regulating temperature.

[0047] The dimensions of the heating tape layout groove 5 are generally as follows: groove depth 14mm, groove width 4mm. There are four grooves arranged at equal intervals circumferentially along the top wall surface of the cylinder segment, and an additional power connection interface position is reserved. The distance between the grooves is not less than 50mm, and the distance from the groove to the wall surface is not less than 20mm.

[0048] All precast segments are prepared and cured in the processing site according to the design requirements, with corresponding lengths, number of segments, diameters, reinforcement, and concrete material strengths.

[0049] The segments are transported to the area pre-selected at the fan location that meets the requirements for storage and installation.

[0050] After receiving the segments, a comprehensive inspection should be carried out. Especially for positions such as the engraved grooves, they should be smooth and flat, without honeycombing, unevenness, etc. The connection deviation of the groove positions is less than 20mm.

[0051] As Figure 5 As shown in the figure, the tower barrel segments are horizontally assembled according to the vertical joint surface to form tower segments and numbered. The tower segments are hoisted in sequence according to the numbers to complete the assembly of the tower segments. Before vertical splicing, the position of the tower segments should be adjusted according to the actual situation on site to make the joints uniform and the transition of the heating tape layout groove 5 smooth.

[0052] The heating tape 4 should be laid closely against the heating tape layout groove 5. After being hoisted to the predetermined position, the structural adhesive layer is applied to make the heating tape surface fully contact with the concrete surface and the epoxy structural layer without sliding.

[0053] The heating duration of the heating tape should be determined according to the on-site environment and the curing effect of the structural adhesive layer. The construction site should have corresponding temperature monitoring measures and control means.

[0054] According to the above process, the bottom segment, middle segment, sub-top segment, and top segment are hoisted and installed. The structural adhesive should be applied at the horizontal joint 6 position of each segment, and the stagger between adjacent rings should be ensured not to be greater than 10mm.

[0055] After all segments are hoisted and installed, the steel strands are tensioned to apply prestress, forming the overall wind turbine tower barrel.

[0056] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field according to the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art should fall within the protection scope determined by the claims.

Claims

1. A connecting structure for a wind power concrete tower barrel. For multiple tower barrel segments, an epoxy structural adhesive layer (3) is provided on the joint surface between each tower barrel segment. It is characterized in that each of the tower barrel segments is provided with a heating tape arrangement groove (5) on the wall surface of the connecting joint surface, and a heating tape (4) is laid in the heating tape arrangement groove (5); an energizing interface position that connects the heating tape arrangement groove (5) to the inner and / or outer surface of the tower barrel segment is also provided inside the tower barrel segment.

2. The wind power concrete tower barrel connection structure according to claim 1, characterized in that, Multiple heating tapes (4) and corresponding heating tape arrangement grooves (5) are arranged at the connecting interface of the tower barrel segment.

3. The wind power concrete tower barrel connection structure according to claim 2, characterized in that, The multiple heating tapes (4) and corresponding heating tape arrangement grooves (5) arranged on the wall surface of the horizontal joint surface (6) of the tower barrel segment are arranged circumferentially along the tower barrel wall surface.

4. A wind power concrete tower barrel connection structure according to claim 1, characterized in that, The multiple heating tapes (4) arranged circumferentially along the tower barrel wall surface are arranged at equal intervals, or the arrangement interval of the heating tape (4) closer to the outer side of the tower barrel is smaller than the arrangement interval of the heating tape (4) closer to the inner side of the tower barrel.

5. A wind power concrete tower barrel connection structure according to claim 1, characterized in that, The heating tape (4) is arranged in an S shape along the wall surface of the horizontal joint surface (6).

6. The wind power concrete tower barrel connection structure according to claim 1, characterized in that, The tower barrel segment has a constant diameter or a variable diameter along the vertical axis direction of the tower body.

7. A wind power concrete tower barrel connection structure according to claim 1, characterized in that, When the diameter of the tower barrel is less than a set threshold value, the tower barrel segment is a whole ring structure; when the diameter of the tower barrel is greater than the set threshold value, the tower barrel segment adopts a segmented structure of two or more segments.

8. A wind power concrete tower barrel connection structure according to claim 7, characterized in that, For the tower barrel segment with a segmented structure, an epoxy structural adhesive layer (3) and a heating tape arrangement groove (5) are provided along the vertical connecting surface of each segment, and a heating tape (4) is arranged in the heating tape arrangement groove (5).

9. A wind power concrete tower barrel connection structure according to claim 1, characterized in that, The distance between the grooves of multiple arrangement grooves (5) on the same wall surface is not less than 50 mm.

10. A wind power concrete tower barrel connection structure according to claim 1, characterized in that, The distance from the arrangement groove (5) to the wall surface is not less than 20 mm.

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