A hoisting method for a hoisted component based on a control rope retracting and extending system

Abstract

The present invention relates to the technical field of transmission tower erection, and discloses a hoisting method for a hoisted component based on a control rope retracting and releasing system, including: S1. Establish a hoisting dynamics model to obtain the control rope axial traction force data corresponding to different installation distances of the control rope retracting and releasing system from the tower body, and find the installation distance corresponding to the control rope axial traction force less than the traction force threshold. The installation position corresponding to the installation distance corresponding to the control rope axial traction force less than the traction force threshold is called the first installation position; S2. Install the control rope retracting and releasing system at the first installation position, and analyze the ideal hoisting strategy of the tower to keep the distance between the hoisted component and the tower body within a safe distance during the hoisting process. Through the present invention, an appropriate installation position of the control rope retracting and releasing system can be selected, and the hoisted component can be kept within a safe distance from the tower body during hoisting.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission tower erection, and particularly relates to a hoisting method for a suspended component based on a control rope retracting and releasing system. Background Art

[0002] With the increasing demand for electric power energy in China, the erection of transmission towers has become an important project, and the process of hoisting tower sections during the tower erection process is a very crucial link.

[0003] When erecting traditional transmission towers, the installation position of the control rope retracting and releasing system needs to be selected by comprehensively considering parameters such as the construction site conditions, the size of the transmission tower, and the axial traction force of the control rope.

[0004] If the installation position of the control rope retracting and releasing system is inappropriate, it will cause the axial traction force of the control rope to be too large. In the long run, it will easily lead to the fracture of the control rope. At the same time, during the hoisting of the suspended component, if the hoisting speed does not match the wire release speed of the control rope, it will also easily cause the suspended component to be too far or too close to the tower. If the suspended component is too close to the tower, there is a risk of rubbing against the tower. If the suspended component is too far from the tower, it will cause the control rope to be subjected to a greater force. Summary of the Invention

[0005] The present invention provides a hoisting method for a suspended component based on a control rope retracting and releasing system, which can select an appropriate installation position for the control rope retracting and releasing system and can keep the suspended component within a safe distance from the tower body during hoisting.

[0006] The present invention is achieved through the following technical solutions:

[0007] A hoisting method for a suspended component based on a control rope retracting and releasing system includes:

[0008] S1. Establish a hoisting dynamics model to obtain the control rope axial traction force data corresponding to different installation distances of the control rope retracting and releasing system from the tower body, and find the installation distance corresponding to the control rope axial traction force less than the traction force threshold. The installation position corresponding to the installation distance corresponding to the control rope axial traction force less than the traction force threshold is called the first installation position;

[0009] S2. Install the control rope retracting and releasing system at the first installation position and analyze the ideal hoisting strategy of the tower to keep the distance between the suspended component and the tower body within a safe distance during hoisting.

[0010] As an optimization, in S1, the specific process of establishing the hoisting dynamics model is as follows:

[0011] S1.1. Establish a coordinate system with the central axis of the tower as the y-axis and the ground as the x-axis;

[0012] S1.2. Find N points on the iron tower in sequence as detection nodes and obtain the coordinates of the N detection nodes, where N is a positive integer not less than 2;

[0013] S1.3. Find the minimum installation distance, and starting from the minimum installation distance, set the installation positions at ordered intervals in the direction away from the center of the coordinate system;

[0014] S1.4. Lift the lifting piece, and collect the axial traction force of the control rope while ensuring that the horizontal distance between the lifting piece and each detection node is the same;

[0015] S1.5. Integrate the installation positions of each detection node and the axial traction force of the control rope to obtain the optimal installation position, which is the first installation position.

[0016] As an optimization, the calculation method of the minimum installation distance is:

[0017] S1.3.1. Assume that the inclination attitude of the lifting piece in the air is parallel to the side inclination of the iron tower, the side inclination of the iron tower is α, and the height of the iron tower is h;

[0018] S1.3.2. The minimum installation distance m min = tanα * h.

[0019] As an optimization, the angle β between the control rope in the control rope retracting and releasing system and the horizontal plane is not greater than 45°.

[0020] As an optimization, the maximum installation distance of the control rope retracting and releasing system

[0021] As an optimization, in step S2, the specific process of analyzing the ideal lifting strategy of the iron tower is:

[0022] S2.1. Set the lifting speed of the lifting piece and the wire releasing speed of the control rope to a m / s for simulation, where a is a positive number, and then use the post-processing module of ADAMS software to obtain the distance of the center of gravity of the lifting piece relative to the center line of the iron tower during the lifting process, so as to obtain the first distance group of the center of gravity of the lifting piece relative to N nodes;

[0023] S2.2. Judge whether several first distances in the first distance group are within the safe distance. If the first distance is greater than the safe distance, increase the wire releasing speed of the control rope to make the first distance within the safe distance; if the first distance is less than the safe distance, decrease the wire releasing speed of the control rope to make the first distance within the safe distance, and finally obtain the ideal lifting strategy.

[0024] As an optimization, the ideal hoisting strategy is as follows: In the initial stage of hoisting, the wire releasing speed of the control rope should be greater than the lifting speed of the hoisted component, so as to reduce the lateral distance between the hoisted component and the tower body of the iron tower; when the lateral distance between the hoisted component and the tower body of the iron tower decreases to the upper limit of the safe distance, the wire releasing speed of the control rope should gradually decrease until it is less than the lifting speed of the hoisted component, so as to ensure that the center of gravity of the hoisted component always remains above the lower limit of the safe distance from the tower body of the erected iron tower, and the distance is not too large.

[0025] As an optimization, the lower limit of the safe distance is 400 mm.

[0026] As an optimization, the upper limit of the safe distance is 800 mm.

[0027] As an optimization, the lateral inclination angle α of the tower body of the iron tower is set according to the type of the iron tower.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] Through the present invention, the installation position of the control rope retracting and releasing system can be selected appropriately, and the hoisted component can be kept within the safe distance from the tower body of the iron tower during the hoisting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0031] Figure 1 It is a schematic side view of the relative position between the hoisted component and the tower body of the iron tower in a hoisting method for a hoisted component based on a control rope retracting and releasing system according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] To make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with the embodiments and the drawings. The illustrative embodiments and descriptions thereof of the present invention are only used to explain the present invention and do not limit the present invention.

[0033] Embodiment 1

[0034] As Figure 1 shown, a hoisting method for a hoisted component based on a control rope retracting and releasing system includes:

[0035] S1. Establish a hoisting dynamics model to obtain the control rope axial traction force data corresponding to different installation distances of the control rope retraction and release system from the tower body, and find the installation distance corresponding to the control rope axial traction force less than the traction force threshold. The installation position corresponding to the installation distance corresponding to the control rope axial traction force less than the traction force threshold is called the first installation position;

[0036] S2. Install the control rope retraction and release system at the first installation position, and analyze the ideal hoisting strategy of the tower to keep the distance between the hoisted object and the tower body within a safe distance during the hoisting process.

[0037] In this embodiment, in S1, the specific process of establishing the hoisting dynamics model is as follows:

[0038] S1.1. Establish a coordinate system with the central axis of the tower as the y-axis and the ground as the x-axis;

[0039] S1.2. Sequentially find N points on the tower as detection nodes and obtain the coordinates of the N detection nodes, where N is a positive integer not less than 2;

[0040] S1.3. Find the minimum installation distance, and starting from the minimum installation distance, orderly and spacedly set installation positions in the direction away from the center of the coordinate system;

[0041] S1.4. Hoist the hoisted object and collect the control rope axial traction force while ensuring that the horizontal distance between the hoisted object and each detection node is the same;

[0042] S1.5. Integrate the installation positions of each detection node and the control rope axial traction force to obtain the optimal installation position, which is the first installation position.

[0043] In this embodiment, the calculation method of the minimum installation distance is as follows:

[0044] S1.3.1. Assume that the inclination attitude of the hoisted object in the air is parallel to the side inclination of the tower body, the side inclination of the tower body is α, and the height of the tower is h;

[0045] S1.3.2. The minimum installation distance m min = tanα * h.

[0046] In this embodiment, the angle β between the control rope in the control rope retraction and release system and the horizontal plane is not greater than 45°.

[0047] As an optimization, the maximum installation distance of the control rope retraction and release system

[0048] In this embodiment, in step S2, the specific process of analyzing the ideal hoisting strategy of the tower is as follows:

[0049] S2.1. Set the lifting speed of the lifting component and the wire releasing speed of the control rope to a m / s for simulation, where a is a positive number. Then, use the post-processing module of ADAMS software to obtain the distance of the center of gravity of the lifting component from the center line of the iron tower during the lifting process, so as to obtain the first distance group of the center of gravity of the lifting component relative to N nodes;

[0050] S2.2. Determine whether several first distances in the first distance group are within the safe distance. If the first distance is greater than the safe distance, increase the wire releasing speed of the control rope to make the first distance within the safe distance; if the first distance is less than the safe distance, decrease the wire releasing speed of the control rope to make the first distance within the safe distance, and finally obtain the ideal lifting strategy.

[0051] In this embodiment, the ideal lifting strategy is as follows: At the initial stage of lifting, the wire releasing speed of the control rope should be greater than the lifting speed of the lifting component to reduce the distance between the lifting component and the side of the iron tower; when the distance between the lifting component and the side of the iron tower decreases to the upper limit of the safe distance, the wire releasing speed of the control rope should be gradually reduced until it is less than the lifting speed of the lifting component, so as to ensure that the center of gravity of the lifting component is always above the lower limit of the safe distance from the side of the already erected iron tower and the distance is not too large.

[0052] In this embodiment, the lower limit of the safe distance is 400 mm.

[0053] In this embodiment, the upper limit of the safe distance is 800 mm.

[0054] In this embodiment, the side inclination angle α of the iron tower is set according to the type of the iron tower.

[0055] Next, take the JC27151CG iron tower as the object, establish a lifting dynamics model of a transmission iron tower with a total height of 60 m by the ADAMS / Cable simplification method, compare and analyze the influence of the control rope axial traction force when the lifting component is lifted to the same height and maintains the same spacing from the already erected tower body at different positions of the control rope winding and unwinding system, and obtain the selection scheme of the reasonable installation position of the control rope winding and unwinding system.

[0056] Figure 1 For the erection of the JC27151CG iron tower, it is a schematic diagram of the relative relationship between the lifting component and the side of the already erected iron tower of the iron tower. This section selects Figure 1 Five detection nodes. Taking the center of the bottom of the iron tower as the coordinate origin, the position data of the five detection nodes are shown in Table 1.

[0057] Table 1

[0058]

[0059] Table 1: JC27151CG is the node position on the side of the iron tower. The side angle of the JC27151CG iron tower is about 15°. The ideal attitude of the lifting component during the lifting process should be slightly greater than the inclination angle of the already erected tower body. Therefore, the installation position of the control rope retracting and releasing system cannot be less than 16 m. Otherwise, the angle of the lifting component cannot be adjusted to be greater than 15° through the control rope. At the same time, according to the transmission tower erection manual, the included angle between the control rope and the ground is not greater than 45°, and the installation position of the control rope retracting and releasing system should be less than the tower height.

[0060] Next, through the iron tower hoisting dynamics model, the lifting component is hoisted to Figure 1 four different heights at detection nodes ②, ③, ④, and ⑤, and all are kept at a distance of 0.45 m from the already erected tower body, so as to analyze the influence of the control rope retracting and releasing system at different installation positions on the axial traction force of the control rope.

[0061] Table 2

[0062]

[0063] Table 2 is the numerical table of the axial traction force of the control rope under different installation positions of the control rope retracting and releasing system when the lifting component is hoisted to detection node ②. The center of gravity of the lifting component is kept at a distance of 0.45 m from the already erected tower body, and the data table of the axial traction force of the control rope obtained under different positions of the control rope retracting and releasing system. It can be seen from Table 2 that before the installation position of the retracting and releasing system is 36 m, the axial traction force of the control rope decreases as the installation distance of the retracting and releasing system increases, but when the installation position of the control rope retracting and releasing system is greater than 36 m, the axial traction force of the control rope increases as the installation distance of the retracting and releasing system increases.

[0064] Table 3

[0065]

[0066] Table 3 is the numerical table of the axial traction force of the control rope under different installation positions of the control rope retracting and releasing system when the lifting component is at node ③.

[0067] Table 4

[0068]

[0069] Table 4 is the numerical table of the axial traction force of the control rope under different installation positions of the control rope retracting and releasing system when the lifting component is at detection node ④.

[0070] Table 5

[0071]

[0072] Table 5 is the numerical table of the axial traction force of the control rope under different installation positions of the control rope retracting and releasing system when the lifting component is at detection node ⑤.

[0073] Tables 3, 4, and 5 are the data tables of the axial traction force of the control rope obtained when the lifting member is lifted to the detection nodes ③, ④, and ⑤, with a distance of 0.45 m between the center of gravity of the lifting member and the already erected tower body, and the control rope retracting and releasing system at different positions. It can be seen from the table that the change of the axial traction force of the control rope is consistent with the results in Table 2. The axial traction force of the control rope decreases first and then increases with the increase of the installation distance of the control rope retracting and releasing system. When the lifting member is at the detection node ③ and the installation distance of the retracting and releasing system is 41 m, the axial traction force of the control rope is the smallest; when the lifting member is at the node ④ and the installation distance of the retracting and releasing system is 46 m, the axial traction force of the control rope is the smallest; when the lifting member is at the detection node ⑤ and the installation distance of the retracting and releasing system is 46 m, the axial traction force of the control rope is the smallest.

[0074] According to the simulation results, the installation distance of the control rope retracting and releasing system of the transmission tower should neither be too close to the tower body nor too far from the tower body. A middle position should be selected to make the axial traction force of the control rope smaller. For transmission towers of different sizes, a hoisting dynamics model can be established correspondingly, and the axial traction force data of the control rope at different installation distances of the retracting and releasing system can be obtained in the above way, so as to obtain the installation distance that makes the axial traction force of the control rope reach a smaller value. In addition, during actual installation, it is also necessary to consider whether the construction site is convenient for the installation of the control rope retracting and releasing system. In summary, the reasonable installation position of the control rope retracting and releasing system selected for the JC27151CG tower is 41 m. At this position, when the lifting member reaches different heights and maintains a suitable distance from the tower body, the axial traction force of the control rope is not large. During actual installation, appropriate adjustments are still required according to the construction site conditions.

[0075] During the hoisting process, when the hoisting speed is greater than the control rope releasing speed, the inclination angle of the lifting member will increase and move away from the tower body side of the tower; when the hoisting speed is less than the control rope releasing speed, the inclination angle of the lifting member will decrease and move closer to the tower body side. Taking the hoisting dynamics model of a transmission tower with a total height of 60 m and the control rope retracting and releasing system 41 m away from the center of the tower as the object, the ideal hoisting strategy of the transmission tower is analyzed, that is, during the hoisting process of the lifting member, what kind of matching relationship between the hoisting speed and the control rope releasing speed can ensure that the lifting member maintains a suitable distance from the already erected tower body (for the JC27151CG tower, the lifting member should maintain a distance of 400 - 800 mm from the already erected tower body in the air).

[0076] The hoisting speed and the control rope releasing speed of the hoisting dynamics model of the transmission tower are both set to 0.5 m / s for simulation. The distance of the center of gravity of the lifting member relative to the center line of the JC27151CG tower during the hoisting process is obtained by using the post-processing module of the ADAMS software, so as to obtain the distance of the center of gravity of the lifting member relative to the five nodes. The results are shown in Table ⑥.

[0077] Table 6

[0078]

[0079] Table 6 shows the distance between the center of gravity of the lifted component and the side of the tower body when lifting and controlling the rope to pay out V500. It can be seen from Table 6 that when the lifting speed is the same as the speed of controlling the rope to pay out, although the lifted component always maintains a distance from the side of the tower body, the distance is too large. Therefore, when lifting the component, the relationship between the lifting speed and the speed of controlling the rope to pay out should be reasonably set. Considering that when the lifting speed is the same as the speed of controlling the rope to pay out, the distance between the lifted component and the tower body is too large, in order to reduce this distance, the speed of controlling the rope to pay out should be greater than the lifting speed during a certain period of time. The lifting speed is set to 0.5 m / s, the initial speed of controlling the rope to pay out is 0.8 m / s, and it gradually decreases to 0.5 m / s from 20 s to 22 s, and remains the same as the lifting speed until the end of the simulation. The simulation data is shown in Table 7.

[0080] Table 7

[0081]

[0082] Table 7 shows the distance between the center of gravity of the lifted component and the side of the tower body when controlling the rope to pay out V600 - 500. It can be seen from Table 7 that when the speed of controlling the rope to pay out is greater than the lifting speed at the initial stage of lifting, the distance between the center of gravity of the lifted component and the side of the tower body decreases, but the distance is still too large. Therefore, it is necessary to further increase the speed of controlling the rope to pay out in the early stage. In addition, when the lifting speed is the same as the speed of controlling the rope to pay out after 22 s, the distance between the center of gravity of the lifted component and the side of the tower body is too small, and even the distance between the center of gravity of the lifted component and the side of the tower body becomes negative. Therefore, after adjusting the speed of controlling the rope to pay out to be greater than the lifting speed in the early stage of hoisting, it is also necessary to make the speed of controlling the rope to pay out less than the lifting speed in the later stage, so that the lifted component is far away from the tower body, and the distance from the side of the tower body is kept above the safe distance.

[0083] The preliminary hoisting strategy for the transmission tower hoisting is as follows: The lifted component in the present invention starts to be hoisted from the installation position of the control rope retracting and paying out system. At the initial stage of hoisting, the speed of controlling the rope to pay out should be greater than the lifting speed to reduce the distance between the lifted component and the side of the tower body; when the distance between the lifted component and the side of the tower body decreases to an appropriate distance (the lower limit of the safe distance), the speed of controlling the rope to pay out should be gradually reduced to be less than the lifting speed, so as to ensure that the lifted component always maintains a distance above the safe distance from the already erected tower body and the distance is not too large.

[0084] According to the preliminary hoisting strategy and combined with the dynamic model of the transmission tower, the specific values of the hoisting speed and the wire releasing speed of the control rope are determined. After multiple simulation experiments, when the hoisting speed is 0.5 m / s, the wire releasing speed of the control rope is 1.2 m / s in the first 20 seconds, decelerates to 0.33 m / s from 20 s to 22 s, and then remains at 0.33 m / s until the end of the simulation. The simulation results are shown in Table 8. It can be seen from Table 8 that: Node ① is located at the bottom tower section, and the installation position of the control rope winding and unwinding system is far from the tower body. The distance between the lifted component and the side of the tower body is relatively large, which is in line with the actual situation. In addition, the distances between the centers of gravity of the lifted components at other nodes and the side of the tower body are all stable at 400 - 800 mm, meeting the safety distance requirements between the lifted component in the air and the already erected tower body for the JC27151CG tower.

[0085] Table 8

[0086]

[0087] Table 8 shows the distance between the center of gravity of the lifted component and the side of the tower body when the wire of the control rope is released at V800 - 450. In summary, the ideal hoisting strategy for the JC27151CG tower is as follows: First, according to the preliminary hoisting strategy for the transmission tower hoisting, obtain the relative relationship changes between the hoisting speed and the wire releasing speed of the control rope during the hoisting process. Then, determine the specific values and change conditions of the hoisting speed and the wire releasing speed of the control rope based on the dynamic simulation model of the transmission tower hoisting.

[0088] The above - described specific implementation manners have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above - described are only the specific implementation manners of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hoisting method for a suspended component based on a control rope retracting and extending system, characterized in that, Including: S1. Establish a hoisting dynamics model to obtain the axial traction force data of the control rope corresponding to different installation distances from the tower body of the tower, and find the installation distance corresponding to the axial traction force of the control rope less than the traction force threshold. The installation position corresponding to the installation distance corresponding to the axial traction force of the control rope less than the traction force threshold is called the first installation position; S2. Install the control rope retracting and releasing system at the first installation position, and analyze the ideal hoisting strategy of the tower to keep the distance between the hoisted component and the tower body within a safe distance during the hoisting process; The ideal hoisting strategy is as follows: At the initial stage of hoisting, the wire releasing speed of the control rope should be greater than the hoisting speed of the hoisted component to reduce the side distance between the hoisted component and the tower body; when the side distance between the hoisted component and the tower body decreases to the upper limit of the safe distance, the wire releasing speed of the control rope should gradually decrease until it is less than the hoisting speed of the hoisted component, so as to ensure that the center of gravity of the hoisted component always remains above the lower limit of the safe distance from the tower body of the erected tower and the distance is not too large.

2. The hoisting method of a hoisting component based on a control rope retracting and extending system according to claim 1, characterized in that, In S1, the specific process of establishing the hoisting dynamics model is as follows: S1.

1. Establish a coordinate system with the central axis of the tower as the y-axis and the ground as the x-axis; S1.

2. Sequentially select N points on the tower as detection nodes and obtain the coordinates of the N detection nodes, where N is a positive integer not less than 2; S1.

3. Find the minimum installation distance, and starting from the minimum installation distance, set the installation positions at regular intervals in the direction away from the center of the coordinate system; S1.

4. Hoist the hoisted component and collect the axial traction force of the control rope while ensuring that the horizontal distance between the hoisted component and each detection node is the same; S1.

5. Integrate the installation positions of each detection node and the axial traction force of the control rope to obtain the optimal installation position, which is the first installation position.

3. The hoisting method of a hoisting component based on a control rope retracting and extending system according to claim 2, characterized in that, The calculation method of the minimum installation distance is as follows: S1.3.

1. Assume that the inclination attitude of the hoisted component in the air is parallel to the side inclination of the tower body, the side inclination of the tower body is α, and the height of the tower is h; S1.3.2, the minimum installation distance m min = tanα * h.

4. A hoisting method for a hoisting member based on a control rope retracting and extending system according to claim 1, characterized in that, The angle β between the control rope in the control rope retracting and releasing system and the horizontal plane is not greater than 45°.

5. A hoisting method for a hoisting member based on a control rope retracting and extending system according to claim 4, characterized in that, The maximum installation distance of the control rope retracting and extending system 6. A hoisting method for a hoisting member based on a control rope retracting and extending system according to claim 1, characterized in that, In step S2, the specific process of analyzing the ideal hoisting strategy of the tower is as follows: S2.

1. Set the hoisting speed of the hoisted component and the wire releasing speed of the control rope to a m / s for simulation, where a is a positive number, and then use the post-processing module of ADAMS software to obtain the distance of the center of gravity of the hoisted component relative to the center line of the tower during the hoisting process, so as to obtain the first distance group of the center of gravity of the hoisted component relative to N nodes; 7. A hoisting method for a hoisted component based on a control rope retracting and extending system according to claim 1, characterized in that, S2.

2. Judge whether several first distances in the first distance group are within the safe distance. If the first distance is greater than the safe distance, increase the wire releasing speed of the control rope to make the first distance within the safe distance; if the first distance is less than the safe distance, decrease the wire releasing speed of the control rope to make the first distance within the safe distance, and finally obtain the ideal hoisting strategy.

8. A hoisting method for a suspended member based on a control rope retracting and extending system according to claim 1, characterized in that, The lower limit of the safe distance is 400 mm. The upper limit of the safe distance is 800 mm.

9. A hoisting method for a hoisting member based on a control rope retracting and extending system according to claim 1, characterized in that, The side inclination angle α of the tower body of the iron tower is set according to the type of the iron tower.

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