Outgoing line laying structure suitable for small-to-large fan land acquisition limited condition

Abstract

The utility model relates to an outgoing line laying structure suitable for small-to-large fan land acquisition limited conditions. The method is suitable for the field of wind power plant reconstruction design, and particularly relates to a design feasibility scheme under the condition that an original land acquisition red line cannot be broken through when a small-capacity fan is detached and then replaced with a large-capacity unit. The technical scheme adopted by the utility model is as follows: the outgoing line laying structure suitable for the small-to-large fan land acquisition limited condition is characterized by comprising a box transformer substation foundation arranged on the ground near a fan tower; one end of the overground sealing bridge is connected with the side wall of the fan tower, the other end of the overground sealing bridge is connected with the box transformer substation foundation, a cable laying channel is arranged in the bridge, one end of the channel is communicated with the interior of the tower through a wire outlet hole in the side wall of the fan tower, and the other end of the channel is communicated with the interior of the box transformer substation foundation; and the fireproof and waterproof sealing plate is arranged in the wire outlet hole in the side wall of the fan tower drum and used for sealing the wire outlet hole, and at least one cable hole matched with a cable is formed in the sealing plate.

Description

Technical Field

[0001] The utility model relates to an outgoing line laying structure suitable for small-capacity wind turbines to be replaced with large-capacity units under restricted land acquisition conditions. It is suitable for the field of wind farm reconstruction design, and in particular, it relates to a design feasibility plan for replacing small-capacity wind turbines with large-capacity units when the original land acquisition red line cannot be broken through. Background Art

[0002] Domestic wind power generation technology has been iterating and developing for decades. The scale and speed of domestic wind power project construction are firmly in the forefront of the world. So far, there are a large number of old wind farms that have been in operation for more than ten years or even decades. In recent years, the models of various wind power manufacturers in the field of wind power have rapidly shown a "large-scale" product trend and have been verified and recognized by the market.

[0003] In the foreseeable future 10 years, there will be a wave of renovation of old wind farms and other capacities from small to large. However, the red lines of some original wind farm sites were used to handle land acquisition procedures based on the foundation area of ​​the original small units. After being replaced with large-capacity units, due to various policies, terrain, geology, site and other factors, the land acquisition red lines cannot be expanded. In order to ensure that the foundation bearing capacity can match the large units, measures such as increasing the thickness and depth of the foundation are usually taken to meet the bearing capacity design requirements, and the current connection method between the wind turbine foundation and the tower generally tends to be anchor bolt type.

[0004] As wind turbines become larger and larger, the cross-section of their outgoing power cables is getting larger and larger in number, and the laying space required is getting larger and larger. If such a foundation design scheme continues to use the existing method of laying cables through pre-buried pipes in the foundation, it will not only interfere with the anchor bolts, the cable laying length will also be too long, and it will also lead to the disadvantages of difficult construction and operation and high replacement costs. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in view of the above-mentioned existing problems, a wire laying structure suitable for converting a small-sized wind turbine into a large-sized wind turbine under the condition of limited land acquisition is provided.

[0006] The technical solution adopted by the utility model is: a wire laying structure suitable for small-to-large wind turbines under restricted land acquisition conditions, characterized in that it includes:

[0007] The box-type transformer foundation is set on the ground near the wind turbine tower;

[0008] A sealed bridge frame on the ground, one end of which is connected to the side wall of the wind turbine tower and the other end is connected to the box transformer foundation. The bridge frame has a cable laying channel inside. One end of the channel is connected to the inside of the tower through the outlet hole on the side wall of the wind turbine tower, and the other end of the channel is connected to the inside of the box transformer foundation.

[0009] A fireproof and waterproof sealing plate is arranged in the outlet hole on the side wall of the wind turbine tower and is used to seal the outlet hole. At least one cable hole adapted to the cable is arranged on the sealing plate.

[0010] The above-ground sealing bridge is supported on a support foundation on the ground below via at least one support.

[0011] The support foundation adopts C20 plain concrete foundation.

[0012] The box-type transformer foundation is placed on the fan foundation, and a fire wall is arranged between the fan tower and the box-type transformer foundation.

[0013] At least one cable bracket for fixing cables is provided on both inner walls of the cable laying channel, and an operation and maintenance channel is formed between the cable brackets on both sides.

[0014] The shell of the above-ground sealed bridge is made of hot-dip galvanized steel plate.

[0015] The center height of the outlet hole on the side wall of the wind turbine tower is 1.2 to 1.4 meters above the flange surface at the bottom of the tower.

[0016] The shape of the wire outlet hole on the side wall of the wind turbine tower is elliptical, and the major axis of the elliptical wire outlet hole is along the vertical direction.

[0017] The two sides of the fireproof and waterproof sealing plate are designed along the circumference to form an elastic edge structure that fits the outlet holes of the wind turbine tower and is sealed with silicone.

[0018] The gap between the cable hole and the cable inside is densely filled with organic fireproof plugging material, and both sides are entirely coated with fireproof paint.

[0019] The beneficial effect of the utility model is that the utility model changes the conventional underground concrete pre-buried pipe laying scheme into a ground bridge laying scheme through the ground sealed bridge frame, etc., so as to avoid interference between the cable and the foundation.

[0020] The utility model innovatively reserves outlet holes on the side wall of the tower and designs a targeted bridge structure to match many features of the current small-to-large modification scenario, solve the difficulties in construction and operation and maintenance, improve installation efficiency, and reduce operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment.

[0022] Figure 2 It is a front view of the cable outlet hole of the wind turbine tower in the embodiment.

[0023] Figure 3 It is a structural schematic diagram of the fireproof and waterproof sealing plate in the embodiment.

[0024] Figure 4 It is a cross-sectional view of the above-ground sealing bridge in the embodiment.

[0025] Figure 5 It is a schematic diagram of the plane layout of the ground sealing bridge in the embodiment.

[0026] 1. Wind turbine tower; 2. Wind turbine foundation; 3. Ground sealed bridge; 4. Bracket; 4-1. Column; 4-2. Cross arm; 5. Box transformer foundation; 6. Bracket foundation; 7. Fireproof and waterproof sealing plate; 7-1. Cable hole; 8. Elastic edge structure; 9. Cable; 10. Cable bracket. DETAILED DESCRIPTION

[0027] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0028] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0029] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0030] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0031] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0032] The present embodiment is an outgoing line laying structure suitable for converting a small-sized wind turbine to a large-sized wind turbine under the condition of restricted land acquisition. A box transformer foundation is arranged on the ground near the wind turbine tower. The box transformer foundation and the wind turbine tower are connected via an above-ground sealed bridge. A cable laying channel is provided inside the above-ground sealed bridge. One end of the cable laying channel is connected to the inside of the wind turbine tower via an outgoing line hole on the side wall of the wind turbine tower, and the other end of the cable laying channel is connected to the box transformer foundation via a reserved hole on the side wall of the box transformer foundation.

[0033] In this example, the outlet hole reserved on the side wall of the wind turbine tower is elliptical in shape, with the long axis of the elliptical outlet hole along the vertical direction. The long and short axis dimensions can be determined based on the actual project model capacity and tower size thickness and other conditions. The outlet hole opening position is 90 degrees counterclockwise facing the tower door, and the hole center height is 1.2 to 1.4 meters above the flange surface to facilitate maintenance operations during operation and maintenance.

[0034] In this embodiment, the wire outlet holes reserved on the side wall of the wind turbine tower are sealed with fireproof and waterproof sealing plates. The thickness of the sealing plates is the same as the thickness of the tower wall. The inner and outer sides of the sealing plates are designed along the circumference to be an elastic edge structure that fits perfectly with the tower to fix the sealing plates and enhance the sealing. Silicone sealing is used to isolate the infiltration of external moisture.

[0035] In this case, the waterproof and fireproof sealing plate can be cast and formed in one go in the factory by the tower supplier according to the requirements of Party A and the designer. Its material is mainly composed of a variety of waterproof and fireproof polymers with rock wool as the main body. It is a non-combustible material and has extremely strong hydrophobicity.

[0036] In this embodiment, the waterproof and fireproof sealing plate opens an appropriate number of cable holes according to the actual number of fan outlet cables during the on-site electrical installation construction stage, and after the cables are installed, an organic fireproof plugging material is used to fill the gaps between the cables and the holes, and fire-retardant paint and waterproof materials are applied to both sides.

[0037] In this embodiment, the outer shell of the ground sealed bridge is made of hot-dip galvanized steel plate with a thickness of not less than 3 mm. The inner walls on both sides of the cable laying channel are divided into several layers of cable brackets for fixing the cables according to the actual number of cables, and a 50 cm wide operation and maintenance channel is formed between the cable brackets on both sides.

[0038] The cables in the wind turbine tower enter the ground sealed bridge through the cable holes on the waterproof and fireproof sealing plate, and enter the box-type transformer foundation through the reserved holes on the side wall of the box-type transformer foundation. Each cable in the ground sealed bridge is fixed to the cable bracket with fasteners or cable ties.

[0039] In this example, the above-ground sealed bridge is supported by multiple groups of brackets on the bracket foundation on the ground below. A group of brackets is set at intervals of 0.8m along the direction of the bridge, and the bracket foundation adopts C20 plain concrete foundation.

[0040] In this embodiment, the bracket has two columns (hot-dip galvanized angle steels) and angle steels are welded on the columns as cross arms to support the above-ground sealed bridge.

[0041] According to the requirements of "Wind Farm Design Code GB51096-2015": The distance between the unit transformer and the wind turbine generator set should not be less than 10m. When the distance is not met, a fire wall should be set up with a fire resistance limit of not less than 2h. Since the land acquisition area for such projects cannot be expanded, and the land for box transformers is generally permanent in China, in this case, the box transformer foundation is placed on the wind turbine foundation, and a fire wall is set between the tower and the box transformer to meet the design specification requirements.

[0042] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cable laying structure suitable for small-to-large wind turbines under restricted land acquisition conditions, characterized in that: include: The box-type transformer foundation is set on the ground near the wind turbine tower; A sealed bridge frame on the ground, one end of which is connected to the side wall of the wind turbine tower and the other end is connected to the box transformer foundation. The bridge frame has a cable laying channel inside. One end of the channel is connected to the inside of the tower through the outlet hole on the side wall of the wind turbine tower, and the other end of the channel is connected to the inside of the box transformer foundation. A fireproof and waterproof sealing plate is arranged in the outlet hole on the side wall of the wind turbine tower and is used to seal the outlet hole. At least one cable hole adapted to the cable is arranged on the sealing plate.

2. The outgoing line laying structure suitable for small-to-large wind turbines under restricted land acquisition conditions according to claim 1 is characterized in that: The above-ground sealing bridge is supported on a support foundation on the ground below via at least one support.

3. The outgoing line laying structure applicable to small-to-large wind turbines under restricted land acquisition conditions according to claim 2 is characterized in that: The support foundation adopts C20 plain concrete foundation.

4. The outgoing line laying structure applicable to small-to-large wind turbines under restricted land acquisition conditions according to claim 1 is characterized in that: The box-type transformer foundation is placed on the fan foundation, and a fire wall is arranged between the fan tower and the box-type transformer foundation.

5. The outgoing line laying structure applicable to small-to-large wind turbines under restricted land acquisition conditions according to claim 1 is characterized in that: At least one cable bracket for fixing cables is provided on both inner walls of the cable laying channel, and an operation and maintenance channel is formed between the cable brackets on both sides.

6. The outgoing line laying structure applicable to small-to-large wind turbines under restricted land acquisition conditions according to claim 1 is characterized in that: The shell of the above-ground sealed bridge is made of hot-dip galvanized steel plate.

7. The outgoing line laying structure applicable to small-to-large wind turbines under restricted land acquisition conditions according to claim 1 is characterized in that: The center height of the outlet hole on the side wall of the wind turbine tower is 1.2 to 1.4 meters above the flange surface at the bottom of the tower.

8. The outgoing line laying structure applicable to small-to-large wind turbines under restricted land acquisition conditions according to claim 1 is characterized in that: The shape of the wire outlet hole on the side wall of the wind turbine tower is elliptical, and the major axis of the elliptical wire outlet hole is along the vertical direction.

9. The outgoing line laying structure applicable to small-to-large wind turbines under restricted land acquisition conditions according to claim 1 is characterized in that: The two sides of the fireproof and waterproof sealing plate are designed along the circumference to form an elastic edge structure that fits the outlet holes of the wind turbine tower and is sealed with silicone.

10. The outgoing line laying structure applicable to small-to-large wind turbines under restricted land acquisition conditions according to claim 1 is characterized in that: The gap between the cable hole and the cable inside is densely filled with organic fireproof plugging material, and both sides are entirely coated with fireproof paint.

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