Grouting method for adapter ring of wind power mixed tower

Abstract

According to the grouting method for the adapter ring of the wind power mixed tower provided by the invention, a multipoint synchronous grouting process is realized by adopting a plurality of symmetrically arranged grouting assistors, and the construction of about 1 ton of grouting materials can be completed only in 30 minutes under the condition of not depending on automatic grouting equipment, so that the grouting efficiency is greatly improved, and the equipment cost is reduced; the innovative inclined plane design and the galling treatment process effectively enhance the bonding performance of the grouting material and the concrete base surface, and the scientific exhaust operation is combined to ensure that the grouting compactness reaches 98% or above; thirdly, self-leveling filling of the grouting material is achieved by accurately controlling the fluidity of the grouting material and optimizing the grouting path, and the common quality defects of hollowing, layering and the like in a traditional grouting process are overcome; the whole process design fully considers the convenience of site construction, can be implemented only by using conventional tools, is particularly suitable for popularization and application in operation environments with limited equipment conditions, such as remote wind power plants, and has remarkable economic benefits and engineering practical values.

Description

Technical Field

[0001] The present invention belongs to the technical field of precast wind power concrete towers, and particularly relates to a grouting method for a wind power hybrid tower adapter ring. Background Art

[0002] With the rapid development of wind power generation technology, precast concrete wind power towers have been widely used in the wind power field due to their advantages such as good durability, low cost, and easy maintenance. In the structure of a wind power concrete tower, as a key component connecting the upper generator set and the lower concrete tower, the structural stability and connection reliability of the adapter ring are crucial. A completely horizontal steel backing plate is usually provided at the top of the adapter ring for precise docking with the generator set, and the connection quality between the steel backing plate and the lower concrete directly affects the mechanical properties and long-term stability of the entire tower.

[0003] In traditional construction, the gap between the steel backing plate and the concrete is often filled with ordinary grouting materials. However, due to insufficient fluidity or unqualified strength of the grouting material, problems such as incomplete grouting, stratification, or shrinkage cracking are likely to occur, thereby affecting the overall bearing capacity and durability of the adapter ring. In addition, existing grouting methods mostly use single-point grouting, which is prone to insufficient filling of the grouting material due to too long grouting path or poor exhaust, forming cavities or weak areas, and it is difficult to meet the requirements of high precision and high strength for wind power towers.

[0004] In recent years, high-strength grouting materials have gradually become the preferred materials for the connection between the steel backing plate and the concrete due to their excellent fluidity and high compressive strength. However, how to achieve efficient, simple, and uniform grouting operations to ensure that the grouting material fully fills all the gaps between the steel backing plate and the concrete is still a technical difficulty in construction. Summary of the Invention

[0005] The present invention provides a grouting method for a wind power hybrid tower adapter ring to solve the problems in the prior art such as relying on large-scale grouting automation equipment, high cost, and complex operation when grouting the wind power hybrid tower adapter ring. The present invention provides a grouting method for a wind power hybrid tower adapter ring, which includes two parts: preparation work before grouting and grouting operation. Among them, the preparation work before grouting includes the following steps: (1) Divide the adapter ring into two symmetric grouting operation surfaces; (2) After the adapter ring concrete is poured to a predetermined height, process the concrete surface into two symmetric inclined surfaces with a slight slope according to the two divided operation surfaces; (3) Use a roughening tool to roughen the two inclined surfaces; (4) Cure until the concrete strength is not less than 30 MPa; (5) Clean the grouting operation surface and sprinkle it with water to moisten it; (6) Symmetrically arrange the grouting auxiliary devices on two working surfaces, with two grouting auxiliary devices placed on each working surface. Insert the feeding port of the grouting auxiliary device into the grouting port of the steel backing plate; The grouting operation includes the following steps: (7) Prepare grouting material with an initial fluidity of not less than 380 mm; (8) Pour the well-stirred grouting material into the grouting auxiliary device. The grouting material flows along the slope to the lower part of the working surface until slurry emerges from all slurry outlets, indicating that the grouting working surface is full; (9) Gently tap the steel backing plate with a rubber hammer to discharge the air bubbles inside the grouting material and complete the grouting treatment.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: First, by using multiple symmetrically arranged grouting auxiliary devices, a multi-point synchronous grouting process is achieved. Without relying on automated grouting equipment, it only takes about 30 minutes to complete the construction of about 1 ton of grouting material, greatly improving the grouting efficiency and reducing the equipment cost; Second, the innovative inclined plane design and surface roughening treatment process effectively enhance the bonding performance between the grouting material and the concrete base surface. Combined with scientific air exhaust operation, it ensures that the grouting density reaches more than 98%; Third, this method realizes the self-leveling filling of the grouting material by precisely controlling the fluidity of the grouting material and optimizing the grouting path, avoiding common quality defects such as hollowing and delamination in the traditional grouting process; Finally, the entire process design fully considers the convenience of on-site construction and can be implemented with only conventional tools, especially suitable for popularization and application in working environments with limited equipment conditions such as remote wind farms, and has significant economic benefits and engineering practical value.

[0007] Further, in step (2), the slope of the inclined plane is 1:15 to 1:25.

[0008] Further, in step (3), the depth of the surface roughening is 8 - 10 mm, and the diameter of the surface roughening is 12 - 16 mm.

[0009] Further, in step (4), the curing time is 18 - 24 h.

[0010] Further, the grouting auxiliary device includes a support frame. A grouting part that gradually narrows downward is installed in the support frame, and the feeding port is arranged at the lower end of the grouting part. The feeding port is a cuboid structure that penetrates up and down.

[0011] Further, a handle is also provided at the top of the support frame. Description of the Drawings

[0012] Figure 1 It is the front view of the grouting auxiliary device in an embodiment of the present invention; Figure 2 It is the side view of the grouting auxiliary device in an embodiment of the present invention; Figure 3 This is a top view of the grouting auxiliary device in an embodiment of the present invention.

[0013] Explanation of reference numerals: 1. Handle; 2. Grouting part; 3. Feeding port; 4. Support frame. Specific implementation manners

[0014] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0015] The present invention provides a grouting method for a wind power hybrid tower adapter ring, which includes two parts: preparation work before grouting and grouting operation; among them, the preparation work before grouting includes the following steps: (1) Divide the adapter ring into two symmetrical grouting operation surfaces; (2) After the concrete of the adapter ring is poured to a predetermined height, the concrete surface is processed into two slightly sloping and symmetrical inclined surfaces according to the two divided operation surfaces; (3) Use a roughening tool to roughen the two inclined surfaces; (4) Cure until the concrete strength is not less than 30 MPa; (5) Clean the grouting operation surface and sprinkle it with water to moisten; (6) Symmetrically arrange the grouting auxiliary devices on the two operation surfaces, place two grouting auxiliary devices on each operation surface, and insert the feeding port of the grouting auxiliary device into the grouting port of the steel backing plate; The grouting operation includes the following steps: (7) Prepare grouting material with an initial fluidity of not less than 380 mm; (8) Pour the stirred grouting material into the grouting auxiliary device, and the grouting material flows along the slope to the lower part of the operation surface until all the slurry outlets discharge slurry, indicating that the grouting operation surface is full; (9) Gently tap the steel backing plate with a rubber hammer to discharge the air bubbles inside the grouting material and complete the grouting treatment.

[0016] Specifically, the inclined plane in step (2) can prepare for filling the entire grouting operation space. The roughening treatment in step (3) can increase the firmness of the connection between the grouting material and the concrete part. The curing treatment in step (4) can make the concrete of the adapter ring gain strength quickly and reduce the appearance quality defects by means of heat preservation and moisture preservation. The grouting auxiliary device in step (6) of the present invention is not limited, and any device that can be adapted to the adapter ring to achieve grouting operation is acceptable. In step (9), gently tapping the steel backing plate with a rubber hammer can prevent the situation of incomplete grouting and make the grouting material fill more densely.

[0017] The grouting method for the wind power hybrid tower adapter ring provided by the present invention, firstly, realizes the multi-point synchronous grouting process by adopting a plurality of symmetrically arranged grouting auxiliary devices. Without relying on automated grouting equipment, only about 1 ton of grouting material can be constructed in 30 minutes, greatly improving the grouting efficiency and reducing the equipment cost; secondly, the innovative inclined plane design and roughening treatment process effectively enhance the bonding performance between the grouting material and the concrete base surface. Combined with scientific exhaust operation, it ensures that the grouting density reaches more than 98%; thirdly, this method realizes the self-leveling filling of the grouting material by precisely controlling the fluidity of the grouting material and optimizing the grouting path, avoiding common quality defects such as hollowing and delamination in the traditional grouting process; finally, the entire set of process design fully considers the convenience of on-site construction and can be implemented only with conventional tools, which is particularly suitable for popularization and application in working environments with limited equipment conditions such as remote wind farms, and has significant economic benefits and engineering practical value.

[0018] Furthermore, in step (2), the slope of the inclined plane is 1:15 to 1:25. By further limiting the slope of the inclined plane, it can further ensure that the grouting material realizes full flow under its own weight and reduce the generation of segregation or bubble residues.

[0019] In a specific embodiment, in step (3), the roughening depth is 8 - 10 mm, and the roughening diameter is 12 - 16 mm. These roughening parameters have been tested in actual construction and the effects are reliable.

[0020] In a specific embodiment, in step (4), the curing time is 18 - 24 h.

[0021] Optionally, please refer to Figures 1 to 3 , the grouting auxiliary device includes a support frame 4, a grouting part 2 that gradually narrows downward is installed in the support frame 4, a feeding port 3 is arranged at the lower end of the grouting part 2, and the feeding port 3 is a cuboid structure that penetrates up and down; a handle 1 is also provided at the top of the support frame.

[0022] In use, place the above grouting auxiliary device on the grouting port of the steel backing plate, insert the material discharge port 3 into the grouting port of the steel backing plate, pour the prepared grouting material into the grouting auxiliary device, and the grouting material can enter the grouting operation area through the material discharge port 3, thereby completing the grouting treatment operation of the adapter ring. After the grouting operation is completed, clean the grouting auxiliary device.

[0023] Through the above grouting auxiliary device, zero loss of grouting material is achieved during the grouting operation, and the grouting effect is good, the grouting efficiency is high. At the same time, the manufacturing cost is very low, it is easy to use, and it has high cost performance and practical value.

[0024] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; if these modifications and variations fall within the scope of the claims of the present invention and its equivalent technologies, they should all be considered as the protection scope of the present invention.

Claims

1. A grouting method for a wind power hybrid tower adapter ring, characterized in that, It includes two parts: preparation work before grouting and grouting operation. Among them, the preparation work before grouting includes the following steps: (1) Divide the adapter ring into two symmetric grouting operation surfaces; (2) After the adapter ring is concreted to the predetermined height, process the concrete surface into two symmetric inclined surfaces with a slight slope according to the two divided operation surfaces; (3) Use a roughening tool to roughen the two inclined surfaces; (4) Cure until the concrete strength is not less than 30 MPa; (5) Clean the grouting operation surface and sprinkle it with water to moisten; (6) Symmetrically arrange the grouting auxiliary devices on the two operation surfaces, place two grouting auxiliary devices on each operation surface, and insert the discharging port of the grouting auxiliary device into the grouting port of the steel backing plate; The grouting operation includes the following steps: (7) Prepare grouting material with an initial fluidity not less than 380 mm; (8) Pour the well-stirred grouting material into the grouting auxiliary device, and the grouting material flows along the slope to the lower part of the operation surface until slurry comes out of all the slurry outlets, indicating that the grouting operation surface is full; (9) Gently tap the steel backing plate with a rubber hammer to discharge the air bubbles inside the grouting material and complete the grouting treatment.

2. The grouting method of the wind power hybrid tower adapter ring according to claim 1, characterized in that, In step (2), the slope of the inclined surface is 1:15 to 1:

25.

3. The grouting method of the wind power hybrid tower adapter ring according to claim 1, characterized in that, In step (3), the roughening depth is 8 - 10 mm, and the roughening diameter is 12 - 16 mm.

4. The grouting method of the wind power hybrid tower adapter ring according to claim 1, characterized in that, In step (4), the curing time is 18 - 24 h.

5. The grouting method of the wind power hybrid tower adapter ring according to claim 1, characterized in that, The grouting auxiliary device includes a support frame, in which a grouting part that gradually narrows downward is installed, and the discharging port is arranged at the lower end of the grouting part. The discharging port is a cuboid structure that penetrates up and down.

6. The grouting method of the wind power hybrid tower adapter ring according to claim 5, characterized in that, A handle is also provided at the top of the support frame.

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