A type of high-strength PE cable pre-embedded pipe fixing clamp for wind turbine foundation

Abstract

This utility model discloses a high-strength PE cable pre-embedded pipe fixing clamp for wind turbine foundations, relating to the field of wind turbine construction technology. Its purpose is to increase the stability of the pre-embedded PE pipe for the cable, and the following technical solution is proposed: It includes multiple crossarms, multiple vertical adjusting screws, and fastening nuts. The lower part of the vertical adjusting screw is unthreaded, and the upper part is threaded. The unthreaded section is placed in the pre-compacted foundation. The multiple crossarms are spaced apart on the threaded section and fixed by fastening nuts. Multiple crossarm holes are spaced apart along the length of the crossarms, and each vertical adjusting screw passes through a corresponding vertical crossarm hole in the multiple crossarms. Both ends of the crossarms are embedded in the foundation. The multiple vertical adjusting screws and the multiple crossarms form a grid frame structure, and a pre-embedded PE pipe for the cable is placed within each grid frame. This utility model overcomes the displacement of the pre-embedded pipe caused by the compression of concrete filling, ensuring the quality of the pre-embedded power cable pipe laying in the wind turbine foundation.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine construction technology, specifically to a high-strength PE cable pre-embedded pipe fixing clamp for wind turbine foundation. Background Technology

[0002] In the design of wind turbine foundations, the detailed drawings of cable ducts usually provide typical schematic diagrams. The drawings only describe the material, quantity, layer spacing, and concrete pouring type of the pre-embedded pipes. However, during construction and pouring, it is often noted that appropriate "reinforcement measures" should be taken. The purpose is to prevent the buried pipes from moving freely during concrete pouring and to avoid damage to the buried pipes.

[0003] However, the specific implementation of the "reinforcement measures" requires technicians to use different methods to fix the pre-embedded PE pipe during construction to meet the on-site construction pouring conditions and specification requirements. The traditional reinforcement method is to use steel bars or wooden piles to fix the pre-embedded PE pipe of the cable in multiple ways. However, this method will cause the pre-embedded PE pipe of the cable to shift due to the filling and squeezing during concrete pouring, resulting in the problem that the subsequent power cable cannot be smoothly inserted. Utility Model Content

[0004] This utility model provides a high-strength PE cable pre-embedded pipe fixing clamp for wind turbine foundation, with the aim of increasing the stability of the cable pre-embedded PE pipe.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] A high-strength PE cable pre-embedded pipe fixing clamp for wind turbine foundation includes multiple crossarms, multiple vertical adjusting screws, and fastening nuts. The lower part of the vertical adjusting screw is a non-threaded section, and the upper part is a threaded section. The non-threaded section is set in the pre-compacted foundation. The multiple crossarms are spaced apart on the threaded section and fixed by fastening nuts. Multiple crossarm holes are opened at intervals along the length of the crossarms. Each vertical adjusting screw passes through the corresponding vertical crossarm hole of the multiple crossarms. Both ends of the crossarms are embedded in the foundation. The multiple vertical adjusting screws and the multiple crossarms form a grid frame structure. A PE cable pre-embedded pipe is set in each grid frame.

[0007] Furthermore, the spacing of the equally spaced crossarm holes in each layer is 1.2-1.5 times the outer diameter of the PE pipe embedded in the cable.

[0008] Furthermore, the length of the unthreaded section is ≥300mm, its surface is coated with an anti-rust coating, and the depth of the unthreaded section inserted into the foundation is ≥250mm.

[0009] Furthermore, the fastening nut is a lock nut and is equipped with a flexible washer.

[0010] This utility model has the following beneficial effects:

[0011] This invention utilizes a vertical adjusting screw, with its unthreaded lower section embedded in the earthwork foundation and its threaded upper section engaging with a crossarm to lay pre-embedded PE pipes for cables within a grid-like fixing frame, forming a porous grid fixing frame. This invention overcomes the vertical displacement of the pre-embedded cable pipes caused by the filling and squeezing during concrete pouring. It offers advantages such as simple construction and low cost, ensuring the quality of pre-embedded power cable pipe installation in wind turbine foundations and facilitating subsequent cable insertion and equipment connection. Attached Figure Description

[0012] Figure 1 This is the front view of the present invention;

[0013] Figure 2 This is a schematic diagram of the vertical adjusting screw and the crossarm.

[0014] Figures 1 to 2 The reference numerals in the attached figures are respectively: 1-vertical adjusting screw, 1a-unthreaded section, 1b-threaded section, 2-crossarm, 2a-crossarm hole, 3-fastening nut, 4-foundation, 5-pre-embedded PE pipe for cable. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Please refer to Figure 1-2This embodiment describes in detail that it includes a multi-layer crossarm 2, multiple vertical adjusting screws 1, and fastening nuts 3. The lower part of the vertical adjusting screw 1 is a threadless section 1a, and the upper part is a threaded section 1b. The threadless section 1a is set in the pre-compacted foundation 4. The multi-layer crossarm 2 is spaced apart on the threaded section 1b and fixed by the fastening nuts 3. The crossarm 2 has multiple crossarm holes 2a spaced apart along its length. Each vertical adjusting screw 1 passes through the corresponding vertical crossarm hole 2a of the multi-layer crossarm 2. Both ends of the crossarm 2 are embedded in the foundation 4. The multiple vertical adjusting screws 1 and the multi-layer crossarm 2 form a grid frame structure. A pre-embedded PE pipe 5 for cables is set in each grid frame. The implementation of this pre-embedded cable pipe support structure begins with the treatment of the natural foundation 4: the natural foundation within the wind turbine foundation area is conventionally leveled and moderately compacted to form a foundation 4 with foundation bearing capacity. The thread specification of the upper threaded section 1b of the vertical adjusting screw 1 matches the fastening nut 3. Based on the positioning coordinates of the wind turbine foundation construction drawing, holes are drilled in the foundation 4 using conventional drilling tools. Crossarm 2 is laser-cut with equally spaced holes 2a along its length. The unthreaded section 1a is vertically inserted into the holes 2a and embedded into the foundation 4. Simultaneously, both ends of the crossarm 2, mounted on the vertical adjusting screws 1, are embedded into the foundation 4. The grid frame structure formed by multiple vertical adjusting screws 1 and multiple crossarms 2 ensures the stability and prevents displacement of each pre-embedded PE pipe 5 for cables. This prevents movement of the pre-embedded PE pipe 5 due to soil movement or the filling and squeezing during concrete pouring, thus ensuring that subsequent power cables can be smoothly inserted into the pre-embedded PE pipe 5.

[0017] The spacing of the equally spaced crossarm holes 2a in each layer of the crossarm 2 is 1.2-1.5 times the outer diameter of the PE pipe 5 embedded in the cable. The spacing of the crossarm holes 2a is determined according to the outer diameter of the PE pipe 5 embedded in the cable, specifically 1.2 to 1.5 times the outer diameter of the PE pipe. For example, when the outer diameter of the PE pipe is 100mm, the hole spacing is 120mm to 150mm. The hole distribution of each layer of the crossarm 2 must be completely consistent, and the crossarm holes 2a must remain vertically coaxial when multiple layers are stacked.

[0018] The unthreaded section 1a has a length ≥300mm and its surface is coated with an anti-rust coating. The unthreaded section 1a is inserted into the foundation 4 to a depth ≥250mm. To increase the anti-rust and corrosion performance of the unthreaded section 1a, an anti-rust coating is applied to the surface of the unthreaded section 1a. The anti-rust coating on the surface of the unthreaded section 1a can be a hot-dip galvanized layer or an epoxy coating. In order to securely fix the vertical adjusting screw 1 in the foundation, the lower unthreaded section 1a of the vertical adjusting screw 1 preferably has a length ≥300mm, and cement grout is injected for fixation after ensuring an insertion depth ≥250mm.

[0019] The fastening nut 3 is a lock-lock nut and is equipped with an elastic washer. In order to prevent the fastening nut 3 from loosening during the tightening process, which would cause relative movement between the vertical adjusting screw 1 and the crossbeam 2, the fastening nut 3 is preferably a lock-lock nut, and the tightness is further increased by the matching elastic washer.

[0020] Installation process:

[0021] During installation, the bottom layer of pre-embedded PE pipe 5 for cables is laid first, and the cables are placed on the surface of foundation 4 according to the design route. Then, the bottom layer of crossarm 2 is installed—the operator inserts both ends of crossarm 2 directly into the lateral soil of foundation 4, with the insertion depth sufficient to meet lateral constraints. Simultaneously, the threaded sections 1b of all vertical adjusting screws 1 in this layer pass through the corresponding crossarm holes 2a on crossarm 2. A fastening nut 3 is screwed into the upper end of the screw 1 that protrudes from the crossarm 2, but is not tightened immediately.

[0022] After completing the installation of the bottom crossarm 2, immediately lay a new row of pre-embedded PE pipes 5 for cables above this layer of crossarm 2: each pre-embedded cable is placed within the grid unit formed by the adjacent threaded rod 1 and crossarm 2. Then install the next layer of crossarm 2: similarly, insert its two ends into the soil on the side wall of the foundation 4, while simultaneously allowing the threaded rod 1 to pass through the hole 2a of this layer of crossarm, and install a lock nut and elastic washer at the top of the threaded rod. Repeat this layered operation: lay a row of pre-embedded cables for each layer of crossarm 2 installed, until the top layer of crossarm 2 is completed.

[0023] After all levels of crossarm 2 and cable pre-embedded installation are completed, overall leveling and tightening are performed: a spirit level is used to check the levelness of each layer of crossarm 2, and the height of the crossarm 2 is adjusted by rotating the fastening nuts 3 to make the multiple crossarms 2 parallel. Finally, a torque wrench is used to tighten all the fastening nuts 3 to the specified torque. At this time, the locking mechanism of the anti-loosening nut and the elastic washer work together to prevent loosening. At this point, multiple vertical adjusting screws 1 and multiple layers of crossarm 2 together form a rigid grid frame, and each grid unit constrains one cable pre-embedded PE pipe 5.

[0024] The key installation point lies in the synergistic effect between crossarm 2 and foundation 4. When installing each layer of crossarm 2, both ends must be inserted into the soil of the foundation sidewall simultaneously to enhance the frame's anti-overturning capacity by utilizing the lateral pressure of the soil. After the grid frame is formed, its structural stability is as follows: vertical loads are transferred to the anchorage section deep in the foundation through threaded rod 1, while horizontal loads are resisted by the embedment effect of crossarm 2 and foundation 4.

[0025] After all the pre-embedded PE pipes 5 for cables are laid and the frame is installed, it must pass the civil engineering inspection batch acceptance, including testing items such as frame verticality and pipe position deviation. Only after the acceptance is qualified can the fan foundation concrete be poured on top of the entire structure. When pouring concrete, avoid impacting the pre-embedded PE pipes 5 for cables, and the vibration operation distance from the grid frame should not be less than 300mm. After the concrete hardens, both ends of the crossarm 2 are permanently anchored in the foundation, forming a permanent pipe position positioning system together with the vertical adjusting screw 1.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high strength PE cable pre-pipe fixing clamp for a wind turbine foundation, characterized in that, The system includes a multi-layer crossarm (2), multiple vertical adjusting screws (1), and fastening nuts (3). The lower part of the vertical adjusting screw (1) is a threadless section (1a), and the upper part is a threaded section (1b). The threadless section (1a) is set in the pre-compacted foundation (4), and the multi-layer crossarm (2) is spaced on the threaded section (1b) and fixed by fastening nuts (3). The crossarm (2) has multiple crossarm holes (2a) spaced along its length, and each vertical adjusting screw (1) passes through the corresponding vertical crossarm hole (2a) of the multi-layer crossarm (2). Both ends of the crossarm (2) are embedded in the foundation (4), and a grid frame structure is formed between the multiple vertical adjusting screws (1) and the multi-layer crossarm (2). Each grid frame is equipped with a pre-embedded PE pipe (5) for cable.

2. The high strength PE cable pre-pipe fixing coupling for wind power generator foundation according to claim 1, characterized in that, The spacing of the equally spaced crossarm holes (2a) of each layer of the crossarm (2) is 1.2-1.5 times the outer diameter of the cable pre-embedded PE pipe (5).

3. The high strength PE cable pre-pipe fixing coupling for wind power generator foundation according to claim 1, characterized in that, The unthreaded section (1a) is ≥300mm in length and has an anti-rust coating on its surface. The unthreaded section (1a) is inserted into the foundation (4) to a depth ≥250mm.

4. The high strength PE cable pre-pipe fixing coupling for wind power generator foundation according to claim 1, characterized in that, The fastening nut (3) is a lock nut and is equipped with an elastic washer.

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