Suspension type steering device and construction method thereof

Abstract

The invention discloses a suspension type steering device, belongs to the technical field of wind power towers, and solves the problem that the durability of a tower structure is reduced due to the fact that an existing steering device transmits steering force through the inner wall of the tower. The device comprises a plurality of steering devices and further comprises a steel cable, the steel cable is located in the concrete tower drum, the head end and the tail end of the steel cable are detachably connected to form the steel cable arranged in the annular direction, the steering devices are all installed on the steel cable arranged in the annular direction, and each steering device is inserted into the concrete tower drum in a radial sliding mode. According to the suspension type steering device, the pressure of the steering gear on the tower drum can be transferred to the annular steel cable, the pulling force borne by the tower drum is reduced, and stress supplement can be conveniently conducted on all prestressed steel beams. The invention further discloses a construction method of the suspension type steering device. By means of the method, the construction efficiency can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of wind turbine tower technology, and more specifically, to a suspended steering device and its construction method. Background Technology

[0002] In wind turbine prestressed concrete towers, external post-tensioning is typically used for reinforcement. The prestressing extends from the bottom to the top of the tower, firmly fixing it to the foundation. To enhance structural stability, most towers taper from bottom to top, and this taper is not linear. Therefore, at abrupt changes, the prestressing tendons can easily come into contact with the inner wall of the tower, necessitating the installation of a steering mechanism to prevent direct contact between the prestressing tendons and the tower body, which can cause wear and reduce tower lifespan. Current steering mechanisms, such as those described in patent CN222363093U, use I-beams and buffer sleeves to support the prestressing tendons. The steering mechanism transmits steering force through the inner wall of the tower, increasing the structural stress on the tower wall and leading to decreased tower durability. Furthermore, these mechanisms are complex and require significant installation labor.

[0003] Therefore, there is an urgent need to develop and design a floating steering device and its construction method to solve the above-mentioned technical problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a suspended steering device that can transfer the pressure of the steering gear on the tower itself to the circumferential steel cable, reduce the tensile force on the tower, and facilitate stress replenishment for all prestressed steel strands.

[0005] The second objective of this invention is to provide a construction method for a suspended steering device, which effectively improves construction efficiency.

[0006] To achieve the aforementioned objective, the present invention provides a suspended steering device, comprising multiple steering units and a steel cable. The steel cable is located inside a concrete tower, and the two ends of the steel cable are detachably connected to form a circumferentially arranged steel cable. The multiple steering units are installed on the circumferential steel cable, and each steering unit is radially slidably inserted into the concrete tower.

[0007] As a further improvement, the concrete tower is provided with a guide rod, and the guide sleeve is provided on the side of the steering device facing the inner wall of the concrete tower, and the guide sleeve is slidably sleeved on the guide rod.

[0008] Furthermore, the guide sleeve is provided with radially arranged threaded holes.

[0009] Furthermore, a ball bearing or pulley is also installed between the guide rod and the guide sleeve.

[0010] Furthermore, the steering mechanism has a support groove on the side facing the inner wall of the concrete tower, and the steel cable is installed in the support groove.

[0011] Furthermore, the steering gear includes a pad and a pad layer. The side of the pad facing the center of the concrete tower has an arc-shaped structure extending in an arc along the height direction of the concrete tower. The pad layer is installed on the side of the pad facing the center of the concrete tower.

[0012] Furthermore, the projection of the pad in the height direction is an arc shape or a U shape.

[0013] Furthermore, the steering gear also includes a limiting rod, which is stepped, and the small end of the limiting rod passes through the pad and is threadedly connected to the guide rod.

[0014] Furthermore, the two ends of the steel cable are anchored together by anchor plates and clamps.

[0015] To achieve the second objective mentioned above, the present invention provides a method for constructing a suspended steering device, the method comprising the following steps:

[0016] S1. All guide rods corresponding to the steering gears are pre-embedded in the concrete tower and cast together with the concrete tower at the same time.

[0017] S2. Insert all the guide sleeves corresponding to the steering gears into the guide rods;

[0018] S3. Make a steel cable, the length of which is greater than the circumference of the steering gear;

[0019] S4. Install the steel cable into the support slots corresponding to all steering gears, connect both ends to the anchor plates, install the clamps for anchoring, and tension the prestressing tendons.

[0020] S5. Install tensioning equipment at both ends of the anchor plate, pull the steel cable out from both ends of the anchor plate until the prestressed tendon reaches the design stress, and tighten the steel cable.

[0021] Beneficial effects

[0022] Compared with the prior art, the advantages of this invention are as follows:

[0023] The suspended steering device of this invention provides the horizontal component of the steering force through steel cables, which can transfer the pressure of the steering force on the tower itself to the circumferential steel cables, reducing the tensile force on the tower. It can also adjust the distance between the steering force and the tower wall. When prestressing supplementation is required, the position of the steering force relative to the tower wall can be adjusted by adjusting the diameter of the steel cables, thereby adjusting the overall prestress of the tower prestressing system. There is no need to adjust each prestressing bundle, which facilitates stress supplementation for all prestressing steel bundles and effectively improves construction efficiency. Attached Figure Description

[0024] Figure 1 It is a schematic diagram of the top view of the structure of the present invention;

[0025] Figure 2 This is an enlarged cross-sectional view of the present invention.

[0026] Figure 3 This is an enlarged schematic diagram of the main view of the connection between the two ends of the steel cable in this invention;

[0027] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0028] Figure 5 This is a partial top view of the enlarged structure of the present invention. Figure 1 ;

[0029] Figure 6 This is a partial top view of the enlarged structure of the present invention. Figure 2 ;

[0030] Figure 7 This is a partial top view of the enlarged structure of the present invention. Figure 3 .

[0031] Among them: 1-steering device, 2-steel cable, 3-concrete tower, 4-guide rod, 5-guide sleeve, 6-support groove, 7-anchor plate, 8-clamping piece, 9-prestressing tendon, 101-pad plate, 102-pad layer, 103-limiting rod. Detailed Implementation

[0032] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0033] See Figure 1-5 This invention provides a suspended steering device comprising multiple steering units 1 and steel cables 2. The steel cables 2 are located inside a concrete tower 3, and their ends are detachably connected to form a circumferential arrangement. This detachable connection facilitates subsequent tensioning of the steel cables 2 to supplement prestress. The multiple steering units 1 are mounted on the circumferential steel cables 2, and are connected together by the steel cables 2. When additional tensioning of the prestressed tendons is required, the steering units 1 are contracted by tightening the steel cables 2. The steering units 1 move towards the center of the circle along the diameter, and the inner circle enclosed by the steering units 1 becomes smaller, increasing the steering force received by the prestressed steel tendons and thus increasing the prestressed tendon stress. Specifically, multiple steering devices 1 are evenly distributed on the steel cable 2, so that the steel cable 2 is subjected to uniform force. At the same time, the prestress distribution of the entire concrete tower 3 is also more uniform. Each steering device 1 is radially slidably inserted into the concrete tower 3, so that each steering device 1 can float radially along the concrete tower 3, which facilitates the subsequent tensioning of the steel cable 2 to supplement the prestress.

[0034] Preferably, a guide rod 4 is provided on the concrete tower 3, and a guide sleeve 5 is provided on the side of the steering device 1 facing the inner wall of the concrete tower 3. The guide sleeve 5 is slidably fitted on the guide rod 4 to guide the steering device 1 to slide radially along the concrete tower 3. In this embodiment, each steering device 1 has two guide rods 4 and two guide sleeves 5. The paired guide rods 4 and guide sleeves 5 provide better guiding performance, making the sliding stability of the steering device 1 better and preventing the steering device 1 from swaying left and right. In other embodiments, the guide rod 4 and guide sleeve 5 can also be square guide rails and square sleeves, which can satisfy the guiding function while allowing a single guide rod 4 and guide sleeve 5 to be used. In other embodiments, the guide sleeve 5 can also be pre-embedded in the concrete sleeve 3, and the guide rod 4 is set on the side of the steering device 1 facing the inner wall of the concrete tower 3, which can also achieve sliding guidance of the steering device 1.

[0035] Preferably, the guide sleeve 5 has radially arranged threaded holes. When installing the steering gear 1, bolts are used to connect it to the threaded holes, and the ends of the bolts press against the guide rod 4. This can temporarily fix the steering gear 1 to the concrete tower 3, avoiding the problem of falling off and making construction more convenient.

[0036] Preferably, a ball bearing or a pulley is also installed between the guide rod 4 and the guide sleeve 5. Specifically, the ball bearing can be movably embedded in the inner wall of the guide sleeve 5, or the pulley can be installed in the inner wall of the guide sleeve 5, so that the guide rod 4 and the guide sleeve 5 are in rolling contact, which further reduces friction and makes the steering gear 1 slide more smoothly.

[0037] Preferably, a support groove 6 is provided on the side of the steering device 1 facing the inner wall of the concrete tower 3. The steel cable 2 is installed in the support groove 6 to connect the steel cable 2 and the steering device 1. The support groove 6 can be a top-opening groove structure, which facilitates the direct insertion of the steel cable 2 into the support groove 6, making installation more convenient. The number of steel cables 2 and support grooves 6 can be set differently depending on the tower type. In this embodiment, there are two steel cables 2 and two support grooves 6, which are symmetrically distributed on the upper and lower sides of the guide sleeve 5, making the force on the steering device 1 more even. A ball bearing or pulley is also installed in the support groove 6. Specifically, the ball bearing can be movably embedded in the inner wall of the support groove 6, or the pulley can be installed in the inner wall of the support groove 6. The steel cable 2 contacts the ball bearing or pulley, so that the support groove 6 and the steel cable 2 are in rolling contact, which further reduces friction, makes the adjustment of the steel cable 2 more convenient, and reduces damage to the steel cable 2.

[0038] Preferably, the steering mechanism 1 includes a pad 101 and a pad layer 102. The pad layer 102 is installed on the side of the pad 101 facing the center of the concrete tower 3. The pad layer 102 can be HDPE or polytetrafluoroethylene and is in contact with the prestressing tendon 9 to reduce friction. The side of the pad 101 facing the center of the concrete tower 3 has an arc-shaped structure extending along the height direction of the concrete tower 3, which can better support the prestressing tendon 9 and prevent the ends of the pad 101 from damaging the PE of the prestressing tendon 9. It should be noted that the shape of the pad layer 102 should be adapted to the surface of the pad 101 facing the center of the concrete tower 3 to better support the prestressing tendon 9.

[0039] Preferably, the two ends of the steel cable 2 are anchored together by anchor plates 7 and clamps 8, achieving a detachable connection between the two ends of the steel cable 2. In this embodiment, the two ends of the steel cable 2 are anchored by anchor plates 7 and clamps 8, which facilitates disassembly and assembly during subsequent prestressing tensioning and can effectively improve construction efficiency.

[0040] like Figure 6 As shown, in another embodiment, the projection of the pad 101 in the height direction is an arc shape or a U shape, and the prestressing tendon 9 is located inside the arc-shaped or U-shaped pad 101, which can provide lateral restraint for the prestressing tendon 9 and avoid the problem of the prestressing tendon 9 detaching from the steering gear 1.

[0041] like Figure 7 As shown, in another embodiment, the steering gear 1 further includes a limiting rod 103, which is stepped, and the small end of the limiting rod 103 passes through the pad 101 and is threadedly connected to the guide rod 4. In practical applications, the limiting rod 103 can be screwed onto the guide rod 4. After connection, the step of the limiting rod 103 is still a distance away from the pad layer 102, so that the steering gear 1 can still move axially along the guide rod 4 and restrict the steering gear 1 from sliding out of the guide rod 4. At the same time, the limiting rod 103 can also restrict the prestressing tendon 9 to prevent it from detaching from the steering gear 1.

[0042] The suspended steering device of the present invention provides a horizontal component of the steering force to the steering gear 1 through the steel cable 2, which can transfer the pressure of the steering gear 1 on the tower itself to the circumferential steel cable 2, reducing the tensile force on the tower. It can also adjust the distance between the steering gear 1 and the tower wall. When prestressing supplementation is required, the position of the steering gear relative to the tower wall can be adjusted by adjusting the diameter of the steel cable 2, thereby adjusting the overall prestress of the tower prestressing system. There is no need to adjust each prestressing bundle, which facilitates stress supplementation for all prestressing steel bundles and effectively improves construction efficiency.

[0043] This embodiment also provides a construction method for a suspended steering device, the method comprising the following steps:

[0044] S1. All guide rods 4 corresponding to the steering gear 1 are pre-embedded in the concrete tower 3 and cast and fixed together with the concrete tower 3 at the same time, so that multiple guide rods 4 protrude from the inner wall of the concrete tower 3.

[0045] S2. Insert all the guide sleeves 5 corresponding to the steering gear 1 into the guide rod 4. The guide sleeves 5 can be temporarily fixed in the guide rod 4 with bolts to achieve temporary fixation of the steering gear 1. Alternatively, the limit rod 103 can be threaded through the pad 102 and the pad 101 and connected to the guide rod 4.

[0046] S3. Make steel cable 2. The length of steel cable 2 is greater than the circumference of the steering gear 1. The steel cable is preferably unbonded steel strand, which has lower friction. Remove the PE from the front end of steel cable 2.

[0047] S4. Install the steel cable 2 into the support slots 6 corresponding to all the steering gears 1, and connect the first and last ends to the anchor plate 7. Install the clamps 8 for anchoring, and tension the prestressed tendons 9 (there will be shrinkage stress loss during prestressing tensioning).

[0048] S5. Install tensioning equipment at both ends of anchor plate 7, pull steel cable 2 out from both ends of anchor plate 7 until the prestressed tendon reaches the design stress, tighten steel cable 2, and re-anchor steel cable 2 to achieve prestress supplementation tension of prestressed tendon 9.

[0049] In the construction method of this embodiment, step S5 can be repeated during the subsequent maintenance of the concrete tower 3 to re-tension the prestressed tendons 9, which is very convenient for maintenance and greatly improves construction efficiency.

[0050] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A floating steering device, comprising a plurality of steering gears (1), characterized in that, It also includes a steel cable (2), which is located inside the concrete tower (3), and the two ends of the steel cable (2) are detachably connected to form a circumferentially arranged steel cable (2). Multiple steering devices (1) are installed on the circumferentially arranged steel cable (2), and each steering device (1) is radially slidably inserted into the concrete tower (3).

2. The suspended steering device according to claim 1, characterized in that, The concrete tower (3) is provided with a guide rod (4), and the steering device (1) is provided with a guide sleeve (5) on the side facing the inner wall of the concrete tower (3). The guide sleeve (5) is slidably sleeved on the guide rod (4).

3. A suspension steering device according to claim 2, characterized in that, The guide sleeve (5) is provided with radially arranged threaded holes.

4. A suspension steering device according to claim 2, characterized in that, A ball bearing or pulley is also installed between the guide rod (4) and the guide sleeve (5).

5. A suspension steering device according to claim 2, characterized in that, The steering device (1) has a support groove (6) on the side facing the inner wall of the concrete tower (3), and the steel cable (2) is installed in the support groove (6).

6. A suspension steering device according to any one of claims 2-5, characterized in that, The steering device (1) includes a pad (101) and a pad layer (102). The side of the pad (101) facing the center of the concrete tower (3) is an arc-shaped structure extending in an arc along the height direction of the concrete tower (3). The pad layer (102) is installed on the side of the pad (101) facing the center of the concrete tower (3).

7. A suspension steering device according to claim 6, characterized in that, The projection of the pad (101) in the height direction is an arc shape or a U shape.

8. A suspension steering device according to claim 6, characterized in that, The steering gear (1) also includes a limiting rod (103), which is stepped, and the small end of the limiting rod (103) passes through the pad (101) and is threadedly connected to the guide rod (4).

9. A suspended steering device according to claim 6, characterized in that, The two ends of the steel cable (2) are anchored together by anchor plates (7) and clamps (8).

10. A construction method for the suspended steering device according to claim 9, characterized in that, The method includes the following steps: S1. Embed all guide rods (4) corresponding to the steering gear (1) into the concrete tower (3) and cast them together with the concrete tower (3) at the same time. S2. Insert the guide sleeves (5) corresponding to all steering gears (1) into the guide rods (4); S3. Make a steel cable (2), the length of which is greater than the circumference of the steering gear (1); S4. Install the steel cable (2) into the support groove (6) corresponding to all the steering gears (1), and connect the two ends to the anchor plate (7), install the clamp (8) for anchoring, and tension the prestressed tendon (9); S5. Install tensioning equipment at both ends of the anchor plate (7) and pull the steel cable (2) out from both ends of the anchor plate (7) until the prestressed tendon reaches the design stress and tighten the steel cable (2).

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