Crawling ladder structure for fan prefabricated concrete tower drum

Abstract

The utility model discloses a ladder stand structure for a fan precast concrete tower drum, which comprises an arc-shaped ladder stand, the arc-shaped ladder stand is fixed on the outer wall of the tower drum and spirally ascends to the position of a tower drum door opening from the bottom of the tower drum, the position of the tower drum door opening is higher than the flood level, and the number of steps of the arc-shaped ladder stand is set according to the height of the flood level. The utility model has the advantages that the structure is simple, steel and land are saved, the transportation cost is reduced, the site construction is simpler and more convenient, and a concrete foundation does not need to be additionally designed.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, in particular to a ladder structure for a precast concrete tower barrel of a wind turbine. Background Art

[0002] After nearly 20 years of rapid development of China's wind power industry, the traditional areas with rich wind resources have been basically developed. In recent years, it has begun to develop towards low wind speed areas (wind speed < 6m / s), and there are rich high shear wind resources in low wind speed regions such as Tianjin, Jiangsu, Anhui, Henan, Shandong, Hubei, and Hebei. In order to obtain the best investment returns and utilize these rich low wind speed and high shear wind resources, wind turbines need to have a larger single unit capacity (currently the mainstream is above 5MW), and the tower barrel structure also needs to be higher (currently the mainstream is 140 - 180m). Precast concrete structure tower racks (see attachment Figure 1 ) have emerged as the times require and have currently become the recognized development direction of the wind power industry within the industry.

[0003] In these areas with rich low wind speed and high shear wind resources, they are also the areas in China where flood disasters occur frequently. Currently, the main solution for designing concrete tower racks in high flood level areas is to raise the elevation of the electrical platform to more than 0.5m above the flood level with a return period of 50 years or the waterlogging level.

[0004] There are currently two different schemes for raising the electrical equipment platform: the first is to only raise the electrical platform without raising the tower barrel door; the second is to raise the electrical platform and the tower barrel door at the same time. The first one requires designing a straight ladder inside the tower barrel to climb onto the electrical platform. The prominent advantage of this scheme is the low production cost of the steel structure. However, the disadvantages are also obvious. When equipment needs to be repaired and components need to be replaced, it is very difficult for maintenance personnel to carry maintenance equipment onto the electrical platform, so it has been less used in the industry. The second one is to design a ladder outside the precast tower barrel to reach the tower barrel door and then climb onto the electrical platform. Currently, the design of the external ladder of the tower rack mainly uses the method of 180° return ladder or 90° return ladder to climb to the tower barrel door. However, it is found in actual use that this type of ladder has disadvantages such as large steel consumption, high cost, large floor area, complex construction technology (requiring a large amount of welding technology), difficult control of construction quality, high transportation cost, the need to design a concrete foundation separately and the risk of uneven settlement, etc. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a ladder structure for a precast concrete tower barrel of a wind turbine, which has the advantages of simple structure, steel saving, land saving, reduced transportation cost, more concise and convenient on-site construction, and no need to design a concrete foundation separately, etc.

[0006] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0007] A ladder structure for a precast concrete tower barrel of a wind turbine, comprising an arc-shaped ladder. The arc-shaped ladder is fixed on the outer wall of the tower barrel and spirally ascends from the bottom of the tower barrel to the position of the tower barrel door opening. The position of the tower barrel door opening is higher than the flood level, and the number of steps of the arc-shaped ladder is set according to the height of the flood level.

[0008] Further, the steps of the arc-shaped ladder are connected to the embedded anchor bolts pre-embedded on the outer wall of the tower barrel through screws.

[0009] Further, the embedded anchor bolt is composed of a steel plate and a sleeve. The sleeve is vertically connected to the steel plate, and a threaded hole for installing the screw is arranged in the sleeve.

[0010] Further, the steps are made of patterned steel plates.

[0011] Further, stiffening ribs are arranged at the bottom of the steps. When the cantilever length of the steps is greater than 800 mm and less than 1200 mm, the stiffening ribs are made of steel plates. When the cantilever length of the steps is greater than 1200 mm, the stiffening ribs are made of channel steel.

[0012] Further, a guardrail is arranged on the outer side of the steps.

[0013] Further, a rest platform is arranged at the position of the arc-shaped ladder close to the tower barrel door opening.

[0014] Further, the rest platform includes a platform panel, platform support beams and diagonal braces arranged at the bottom of the platform panel, and a platform guardrail arranged on the outer side of the platform panel.

[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0016] 1. The ladder structure of the utility model is designed to be more steel-saving, with considerable economic benefits.

[0017] 2. The ladder structure of the utility model is built on the outer wall of the tower barrel, completely occupying no land area, with good stability and high safety.

[0018] 3. The ladder structure of the utility model cancels the welding process and completely adopts bolt connection, which is convenient and fast to install, and the construction quality is easy to control.

[0019] 4. The ladder structure of the utility model is light in weight and small in volume. It can be "broken into pieces", that is, processed into scattered small components in the factory and then assembled into a complete structural system by bolts after being transported to the wind turbine position, which is convenient for transportation.

[0020] 5. The ladder structure of the utility model does not require an additional concrete foundation design. The ladder structure is directly fixed on the tower barrel, saving investment and effectively avoiding the damage to the structure caused by uneven settlement. Description of the Drawings

[0021] Figure 1 This is the overall schematic diagram of the ladder structure of the present utility model.

[0022] Figure 2 This is the top view of the ladder structure of the present utility model.

[0023] Figure 3 This is the structural schematic diagram of the embedded anchor bolt of the present utility model.

[0024] Figure 4 This is the side view of the embedded anchor bolt of the present utility model.

[0025] Figure 5 This is the connection schematic diagram of the tread and the embedded anchor bolt of the present utility model.

[0026] Figure 6 It is Figure 5 The A-A cross-sectional view in Detailed implementation mode

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0028] Embodiment:

[0029] As Figure 1 , Figure 2 shown, this embodiment provides a ladder structure for a precast concrete tower barrel of a fan, including an arc-shaped ladder. The arc-shaped ladder is fixed on the outer wall of the tower barrel 1 and spirally ascends from the bottom of the tower barrel 1 to the position of the tower barrel door opening 2. The position of the tower barrel door opening 2 is higher than the flood level, and the number of treads 4 of the arc-shaped ladder is set according to the height of the flood level.

[0030] Specifically, the tread 4 of the arc-shaped ladder is connected to the embedded anchor bolt 5 embedded on the outer wall of the tower barrel 1 through a screw rod 6, and the embedded anchor bolt 5 can be embedded on the precast concrete segment 3 of the tower barrel 1.

[0031] As Figure 3 , Figure 4 shown, the embedded anchor bolt 5 is composed of a steel plate 501 and a sleeve 502. The sleeve is vertically connected to the steel plate, and a threaded hole 503 for installing the screw rod 6 is provided inside the sleeve.

[0032] As Figure 5 , Figure 6As shown in the figure, the tread 4 is a diamond plate with a thickness of 5 mm, and a guardrail 7 is arranged on the outer side of the tread 4. Stiffening ribs 8 are arranged at the bottom of the tread 4. When the cantilever length of the tread 4 is greater than 800 mm and less than 1200 mm, the stiffening ribs are made of steel plates with a thickness of 10 mm; when the cantilever length of the tread 4 is greater than 1200 mm, the stiffening ribs are made of channel steel.

[0033] Specifically, a rest platform is arranged at the position of the arc-shaped ladder close to the tower barrel door opening 2. The rest platform includes a platform panel 9, platform support beams 10 and diagonal braces 11 arranged at the bottom of the platform panel 9, and a platform guardrail 12 arranged on the outer side of the platform panel 9. The rest platform can be assembled into a whole on the ground and then hoisted as a whole to the preset installation position for installation.

[0034] The manufacturing process of the present utility model is as follows:

[0035] First, before pouring concrete in a precast concrete factory, the positioned embedded anchor bolts are embedded into the precast concrete segments of the tower barrel. The number and positions of the embedded anchor bolts in different segments of the precast concrete segments are not the same, and they need to be adjusted according to the position of the tower barrel door opening. The precast concrete segments with the embedded anchor bolts are transported to the wind turbine project, and the segments are assembled into a tower structure at the project site according to the pre-designed positions.

[0036] Then, the designed treads are fixed on the precast concrete segments through the embedded anchor bolts. The number of treads required at different flood levels is different, and it needs to be adjusted according to the height of the tower barrel door opening.

[0037] Next, the rest platform is installed, that is, the platform panel, platform support beams, diagonal braces and platform railings are assembled into a whole on the ground, and then hoisted as a whole to the embedded anchor bolts at the tower barrel door opening, and the screw rods are installed and pre-tightening force is applied to ensure the stability of the structure.

[0038] Finally, the guardrail is installed with bolts.

[0039] Compared with the existing folding ladder design, taking the tower barrel door opening 6 m away from the ground as an example, the diameter of the precast concrete tower barrel gradually decreases from the tower bottom to the tower top. As shown in Table 1 below, the ladder structure design of the present utility model saves more steel, saves land, reduces the transportation cost, and the on-site construction is more concise and convenient. There is no need to make a concrete foundation separately. At the same time, since there is no need to design a concrete foundation separately, the structure is directly rooted on the outer wall of the tower barrel, saving investment and completely avoiding the damage to the structure caused by uneven settlement, greatly improving the competitiveness of the precast concrete tower barrel products.

[0040]

[0041] Table 1 Scheme comparison

[0042] Meanwhile, the ladder structure of the present utility model can be applicable to all precast concrete tower barrels. Whether it is a wind turbine position with high flood control requirements or a wind turbine position with low flood control requirements, the functional requirements can be met by adjusting the position, quantity of the embedded anchor bolts and the quantity of the steps.

[0043] The above is only a preferred embodiment of the patent of the present utility model, but the protection scope of the patent of the present utility model is not limited thereto. Any person skilled in the art within the scope disclosed by the patent of the present utility model, according to the technical solution of the patent of the present utility model and the inventive concept of the patent of the present utility model, makes equivalent replacements or changes, all belong to the protection scope of the patent of the present utility model.

Claims

1. A ladder structure for a prefabricated concrete tower of a wind turbine, characterized in that: It comprises an arc ladder, which is fixed on the outer wall of the tower and spirals up from the bottom of the tower to the position of the tower doorway. The position of the tower doorway is higher than the flood level, and the number of steps of the arc ladder is set according to the height of the flood level.

2. A ladder structure for a precast concrete tower of a wind turbine according to claim 1, characterized in that: The steps of the arc-shaped ladder are connected with pre-buried anchor bolts pre-buried on the outer wall of the tower through screw rods.

3. A ladder structure for a precast concrete tower of a wind turbine according to claim 2, characterized in that: The embedded anchor bolt is composed of a steel plate and a sleeve, the sleeve is vertically connected to the steel plate, and a threaded hole for installing a screw rod is arranged in the sleeve.

4. The ladder structure for a precast concrete tower of a wind turbine according to claim 1, characterized in that: The steps are patterned steel plates.

5. The ladder structure for a precast concrete tower of a wind turbine according to claim 1, characterized in that: A stiffening rib is arranged at the bottom of the step. When the cantilever length of the step is greater than 800 mm and less than 1200 mm, the stiffening rib is made of steel plate. When the cantilever length of the step is greater than 1200 mm, the stiffening rib is made of channel steel.

6. The ladder structure for a precast concrete tower of a wind turbine according to claim 1, characterized in that: A guardrail is arranged on the outer side of the step.

7. The ladder structure for a precast concrete tower of a wind turbine according to claim 1, characterized in that: A rest platform is arranged at a position of the arc ladder close to the tower doorway.

8. The ladder structure for a precast concrete tower of a wind turbine according to claim 7, characterized in that: The rest platform comprises a platform panel, a platform support beam and a diagonal brace arranged at the bottom of the platform panel, and a platform guardrail arranged at the outer side of the platform panel.

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