Construction method for hoisting single-rocker-arm derrick of large-span derrick
By using the single-rocker boom hoisting method, the entire derrick was hoisted and positioned, solving the problems of large workload, difficult operation, and high safety hazards associated with hoisting derricks at V-shaped lifting points, thus improving construction efficiency and safety.
Patent Information
- Application Number
- CN202511154428.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-18
- Publication Date
- 2025-11-18
AI Technical Summary
In existing technologies, V-shaped lifting points for hoisting derricks involve a large workload, are difficult to operate, pose significant safety hazards, and involve a large amount of high-altitude work, making it difficult to achieve the complete hoisting and positioning of the entire section.
Using a single rocker arm boom, by setting auxiliary lifting points at the end of the ground wire crossarm, installing connecting seats and lifting ropes, and combining with a hydraulic control system, the entire derrick can be lifted and positioned, reducing the use of positioning control ropes.
It improved the safety and operability of hoisting operations, increased construction efficiency by 50%, and reduced the amount of work at height.
Smart Images
Figure CN120964665A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of power construction, in particular to a construction method of a single-oscillating-arm pole for hoisting a large-span derrick. BACKGROUND
[0002] In power construction, a V-shaped hoisting point is often used to hoist a derrick, but there are the following problems in setting a V-shaped hoisting point on the top of a tower to hoist a derrick: a) The V-shaped sleeve hoisting steel wire arrangement and the platform and walkway connected with the tower have a large hoisting workload, and the V-shaped sleeve hoisting into position requires high skills of high-altitude workers.
[0003] b) The derrick is hoisted and positioned in sections or pieces, and a positioning control rope needs to be arranged, the operation is difficult due to the limited space, and the safety risk is high; c) After the derrick standard section is hoisted to a certain height, it can only be hoisted in pieces due to the size limitation of the tower body, and the high-altitude operation workload is large and the work efficiency is low.
[0004] Therefore, a single-oscillating-arm pole is needed to solve the above problems, the single-oscillating-arm pole has the functions of hoist trolley amplitude, rotation, hoisting, etc., and the derrick is hoisted and positioned in sections, and a positioning control rope is not needed for auxiliary control during positioning; however, due to the high safety requirement of the pole, it is particularly important to conduct in-depth research before design, manufacture and use. SUMMARY
[0005] The present application provides a construction method of a single-oscillating-arm pole for hoisting a large-span derrick, which can overcome some or certain defects of the prior art.
[0006] According to the construction method of the single-oscillating-arm pole for hoisting a large-span derrick, the following steps are included: 1) Single-oscillating-arm pole installation; 1.1) Set up auxiliary hoisting points at the ends of the ground wire crossbars; Two Ф19.5x64m steel wires are installed at the intersection of the main pipes at the top of the ground wire crossbars at both ends, a 10-ton shackle is used for connection, a 6-ton hand-operated hoist is connected in series for tension adjustment; the main hoisting point Φ19.5 steel wire 1 is adjusted by the hand-operated hoist to tighten the wire length to 5m above the top of the tower body; the steering Ф19.5 steel wire 2 is adjusted by the hand-operated hoist to tighten the wire length to about 4m above the top of the tower body; a 5-ton hoisting trolley is set up as a V-shaped sleeve hung on the main hoisting point Φ19.5 steel wire 1, and a 5-ton steering trolley is set up on the other Ф19.5 steel wire 2, and the hoisting steel wire is connected from the 5-ton steering trolley to the ground hoisting winch; 1.2) Install connection seat A and connection seat B; connection seat A and two connection seats B are installed on the corresponding tower top main bars; 1.3) The transition section is hoisted as a whole onto the connecting seat A and connected with a Ф40*120 pin; 1.4) Install and connect the upper support, lower support and boom root section on the ground, hoist the whole assembly onto the transition section and connect it with a Ф40*120 pin; 1.5) Lifting boom head section; 1.6) Hoisting and installing telescopic booms; After the telescopic rod is adjusted to the required length, it is hoisted and connected to the lower support and connecting seat B (180) with a Φ45*146 pin. 1.7) Install lifting ropes and hooks; Using a Φ10x500m DuPont wire rope, the hoisting cable is connected to the Φ15 lifting wire rope via the lower support pulley, the boom root pulley, the boom head pulley, a 3t turning wheel from the outside of the tower to the tower leg, and a 3-ton motorized winch on the ground. The DuPont wire rope is connected to the Φ15 lifting wire rope using a 3-ton anti-bending connector. The DuPont wire rope is pulled on the ground using a 3-ton motorized winch to fully thread the lifting wire rope through the pulley block. The Φ15 lifting wire rope is pulled to the ground and secured with a wire clamp. The 3-ton anti-bending connector is then removed, and the lifting wire rope is connected to the hook. 2) Derrick hoisting; 2.1) For sections below 12 (i.e., height below 125 meters), the derrick shall be hoisted as a whole from inside the tower, using two 3t slings at the hoisting points and 13 DuPont wire as the retaining rope; 2.2) For towers over 125 meters, the derrick is hoisted as a whole from the outside of the tower using a remote control to rotate the single rocker arm boom to the outside of the tower. 13 DuPont wire is used as the retaining rope. 3) Platform installation; For auxiliary facilities located more than 5 meters from the center of the tower, a gantry crane can be used to hoist them together or separately during the hoisting of that section. For auxiliary facilities located within 5 meters from the center of the tower, the gantry crane must be removed and the tower body TD11 single rocker arm gantry crane must be used to hoist them layer by layer from bottom to top. 4) Installation of derrick connectors and handrail ropes; The derrick is connected to the tower section and installed synchronously with the derrick's upward installation progress. During installation, the straightness of the derrick should be monitored and adjustments made accordingly. The handrail ropes of the tower body horizontal pipe are installed simultaneously with the tower erection. After the entire tower is installed, all handrail ropes are inspected and tightened. 5) Installation of the spiral staircase and climbing machine inside the derrick; Climbing machines are installed on the outside of the derrick, while spiral staircases and rest platforms are installed inside the derrick.
[0007] Preferably, the single rocker arm boom includes a boom, one end of which is connected to an upper support, a lower support is provided below the upper support, a transition section is provided below the lower support, and a connecting seat A is provided below the transition section. Connector A is horizontally connected to two telescopic rods, and the telescopic rods are equipped with connectors B at their heads; the two telescopic rods are at an angle of 90°, and connector A and the two connectors B are respectively installed on the main members of the corresponding tower top; The other end of the boom is connected to a hook; the bottom surface of the boom is equipped with a slewing support, which is connected to the upper support.
[0008] Preferably, the boom includes a boom root section and a boom head section, with hinge points at both ends of the boom root section; a column is provided on the top surface of the upper support, and the column and the slewing bearing are respectively hinged to the corresponding hinge points.
[0009] Preferably, a boom platform is provided on one side of the upper support, and a railing is provided on the boom platform. A hydraulic control system is installed inside the railing, and the hydraulic control system is used to control the movement of the boom.
[0010] Preferably, the telescopic rod includes a first connector, a first support rod connected to the first connector, a second support rod cooperating with the first support rod, and a second connector connected to the second support rod.
[0011] Preferably, the first connector is connected to connector A, and the second connector is connected to connector B.
[0012] Preferably, in step 1.7), the lifting ropes are all made of Φ15 steel wire rope.
[0013] As a preferred option, in step 1.7), after the lifting rope is installed, the winding direction should be carefully checked to ensure that the rope is not twisted. Otherwise, the rope should be unwound and rewound.
[0014] Preferably, in step 1.7), the boom is installed in place before hoisting to ensure that the outer sleeve of the luffing cylinder is in place.
[0015] Preferably, in step 2.2), when the derrick is hoisted as a whole from the outside of the tower, the control rope at the point where the hoisting components are tied should be a single DuPont wire. Considering the worst-case scenario, the angle between the single DuPont wire and the ground should be 60° to ensure the smooth lifting of the derrick. The formula for calculating the resultant static tension of the control rope is: ; The angle between the DuPont cable and the ground. The angle between the lifting wire rope and the plumb line; The vertical component of the force on the DuPont wire is 3.1 * sin60° = 2.6 kN.
[0016] The beneficial effects of this invention are as follows: This invention reduces the need for positioning control ropes, significantly improving operational safety and operability. It provides proprietary equipment and methods for hoisting large-span tower derricks, increasing construction efficiency by 50%. Attached Figure Description
[0017] Figure 1 Structure diagram of a single swing arm embrace pole for hoisting a large-span derrick in Example 1; Figure 2 Structure diagram of a connection seat A and a connection seat B in Example 1; Figure 3 Structure diagram of a ground wire cross arm in Example 2; Figure 4 Structure diagram of a cross arm hoisting point in Example 2; Figure 5 Hoisting diagram of a connection seat A and a connection seat B in Example 2; Figure 6 Hoisting diagram of a transition joint in Example 2; Figure 7 Hoisting diagram of a slewing assembly and an arm root joint in Example 2; Figure 8 Hoisting diagram of an arm head joint in Example 2; Figure 9 Hoisting diagram of a telescopic rod in Example 2; Figure 10 Hoisting wire rope installation diagram (wire rope enters from the outside) in Example 2; Figure 11 Single-line diagram of a large-span tower in Example 2. DETAILED DESCRIPTION
[0018] The present application will be described in detail with reference to the drawings and examples. It should be understood that the examples are merely illustrative of the present application and are not limiting.
[0019] Example 1 As shown in Figure 1 and Figure 2 , the present example provides a single swing arm embrace pole for hoisting a large-span derrick, which includes a movable arm 110, one end of the movable arm 110 being connected to an upper support 120, a lower support 130 being arranged below the upper support 120, a transition joint 140 being arranged below the lower support 130, and a connection seat A 150 being arranged below the transition joint 140. Two telescopic rods 170 are horizontally connected to the connection seat A 150, and the telescopic rods 170 are provided with connection seats B 180 at rod heads; the two telescopic rods 170 are arranged at an angle of 90°, and the connection seat A 150 and the two connection seats B 180 are respectively installed on corresponding tower top main materials of a tower; The movable arm 110 is connected to a lifting hook 160 at the other end; a slewing support 190 is arranged on the bottom surface of the movable arm 110, and the slewing support 190 is connected to the upper support 120.
[0020] The boom 110 includes a root section 111 and a head section 112, with hinge points at both ends of the root section 111. A column 121 is mounted on the top surface of the upper support 120, and the column 121 and the slewing bearing 190 are hinged to their respective hinge points. The root section 111 and the head section 112 facilitate the installation of the boom 110 and allow for optimal raising and lowering of the hook 160. The slewing bearing 190 allows for easy adjustment of the boom 110, thus enabling its raising or lowering.
[0021] A boom platform 122 is provided on one side of the upper support 120. A railing 123 is provided on the boom platform 122. A hydraulic control system is installed inside the railing 123. The hydraulic control system is used to control the movement of the boom 110.
[0022] The telescopic rod 170 includes a first connector 171, a first support rod 172 connected to the first connector 171, a second support rod 173 cooperating with the first support rod 172, and a second connector 174 connected to the second support rod 173.
[0023] The first connector 171 is connected to connector A 150, and the second connector 174 is connected to connector B 180.
[0024] This embodiment designs a small single-arm jib for hoisting large-span derricks. Through controlled electric amplitude modulation, it allows for convenient and efficient hoisting of the derrick. The jib, with its connecting seat A150 and two connecting seats B180, can be stably installed on the top of the tower.
[0025] Example 2 This embodiment provides a construction method for hoisting a single-rocker boom gantry for large-span derricks, which includes the following steps: 1) Single rocker arm pole installation; 1.1) Set auxiliary lifting points at the end of the grounding wire crossarm; Two Φ19.5x64m steel wire ropes are installed at the intersection of the main pipes at the top of the crossarms at both ends of the ground wire, connected using 10-ton shackles, and a 6-ton lever hoist is used for tension adjustment. The lever hoist at the main lifting point Φ19.5 steel wire rope 1 is adjusted to tighten the rope length to 5m above the tower top. A Φ19.5 steel wire rope 2 is set up, and the lever hoist is adjusted to tighten the rope length to approximately 4m above the tower top. A 5-ton lifting pulley is set up as a V-sleeve and hung on the main lifting point Φ19.5 steel wire rope 1. A 5-ton steering pulley is set on the other Φ19.5 steel wire rope 2, and the lifting wire rope passes through the 5-ton steering pulley to the ground lifting winch. Figure 3 and Figure 4 As shown in the figure, the Φ13 DuPont wire is a high-strength polyester fiber rope, DB-21 is a 21-ton fan-shaped plate, and DB-21 is connected to multiple 3t shackles.
[0026] 1.2) Install the connection seat A 150 and the connection seat B 180; the connection seat A 150 and the two connection seats B 180 are respectively installed on the corresponding tower top main material, as shown in Figure 5 .
[0027] 1.3) The transition section 140 is hoisted to the connection seat A 150 as a whole, and is connected with a Ф40*120 pin shaft; as shown in Figure 6 .
[0028] 1.4) The upper support 120, the lower support 130 and the arm root section 111 are connected on the ground, and the whole is hoisted to the transition section 140 and connected with a Ф40*120 pin shaft, as shown in Figure 7 .
[0029] 1.5) Hoist the arm head section 112, as shown in Figure 8 .
[0030] 1.6) Hoist the telescopic rod 170; After the telescopic rod 170 is adjusted to the required length, it is hoisted and connected with the lower support 130 and the connection seat B 180 with a Ф45*146 pin shaft, as shown in Figure 9 .
[0031] 1.7) Install the hoisting rope and the hook 160; Use Ф10x500m Dupont wire to pass through the lower support pulley, the arm root pulley, the arm head pulley, the tower leg 3t turning outside the tower, and the ground 3-ton motorized winch; connect the Dupont wire with a Φ15 hoisting steel wire rope with a 3-ton bending-resistant connector, pull the Dupont wire on the ground with a 3-ton motorized winch, pass the hoisting steel wire rope through the trolley group, pull the Φ15 hoisting steel wire rope to the ground, clamp the steel wire rope with a wire clamp, remove the 3-ton bending-resistant connector, and connect the hoisting steel wire rope with the hook, as shown in Figure 10 .
[0032] In step 1.7), the hoisting rope is all Φ15 steel wire rope. After the hoisting rope is installed, it should be carefully checked whether the winding direction is correct, and there should be no rope twisting phenomenon, otherwise it should be removed and re-wound. The boom should be ensured to be installed in place before hoisting.
[0033] 2) Hoist the derrick; 2.1) Hoist the derrick (J1, J2, J3) below the 12th section, i.e. below 125 meters in height from the inside of the tower, use 2 3t lifting belts as lifting points, and use Ф13 Dupont wire as a stay rope.
[0034] 2.2) above 125 meters, the derrick J2, J3, J4) from the tower outside the whole hoisting, using a remote control, control single arm pole rotation to the outside of the tower, from the tower outside the whole hoisting derrick, using Φ13 DuPont silk to stay rope.
[0035] Control rope calculation: for the whole hoisting of the derrick from the outside of the tower, the control rope at the binding lifting piece should use a DuPont silk, considering the most unfavorable case, the angle of a DuPont silk to the ground should be 60°, in order to ensure the stable lifting of the derrick; the control rope static tension resultant force calculation formula is: ; The angle between the DuPont silk rope and the ground is The angle between the hoisting wire rope and the plumb line is The vertical component of DuPont silk is 3.1*sin60°=2.6kN.
[0036] Therefore: when hoisting the cross arm, the control rope uses a single φ10 DuPont silk, the single breaking tension is 40 kN, and the safety factor is greater than 3.5 times the safety factor specified in the safety regulations, which meets the requirements.
[0037] Derrick category The tower is equipped with a seat derrick across the center. The main pipe specification is Ф140x5 (Q355), and the derrick is segmented from top to bottom as follows: leg section J1 (1 section, 4m high), standard section J2 (38 sections, each 4m high); standard section J3 (6 sections, each 4.5m high), top section J4 (1 section, 2.5m high); the cross-sectional size is 2400mmx2400mm, and all the derricks are single-section whole assembly.
[0038] Derrick structure (1) J1 leg section (whole hoisting from inside) The derrick leg section has a cross-sectional size of 2400mmx2400mm, a section height of 4m, and a weight of 1304kg. The main pipe uses Ф140x5 steel pipe. The upper part of the leg section is connected with the standard section of the derrick by using main pipe lining connecting pipe and 2 sets of M20x55 bolts, and the lower part is connected with the foundation through anchor bolts.
[0039] (2) Standard section J2 The derrick standard section J2 has a cross-sectional size of 2400mmx2400mm, a single section height of 4m, and a weight of 1110kg. A total of 38 sections are required, and an inner spiral staircase is provided. The main pipe uses Ф140x5 steel pipe. The connection mode with other sections is to use main pipe lining connecting pipe and 2 sets of M20 bolts.
[0040] (3) Standard section J3 The standard section J3 of the derrick has a cross-sectional dimension of 2400mm × 2400mm, a single section height of 4.5m, a weight of 1155kg, and requires a total of 6 sections, with an internal spiral ladder. The main pipe uses Φ140x5 steel pipe. All sections are connected using a main pipe with an inner lining and two sets of M20 bolts.
[0041] (4) Top section J4 (lifted as a whole from the outside of the tower body) The top section J4 of the derrick has a cross-sectional dimension of 2400mm×2400mm, a height of 2.5m, and a weight of 590kg. The main pipe is made of Φ140x5 steel pipe. The upper main material is enclosed, and the lower part connects to the standard section of the derrick.
[0042] Table 1 Weight Parameters of Ancillary Facilities
[0043] Table 1 shows the weight parameters of the auxiliary facilities. Through analysis of the impact of the platform and horizontal cross members on the hoisting of the derrick, it can be seen from the opening size that the 2.4m*2.4m derrick can be hoisted as a whole from the gap of the P4 platform of the 18th section of the tower, but cannot be hoisted as a whole from the gap of the P3 platform of the 12th section of the tower. Therefore, the derrick should be hoisted from the inside at a height of less than 12 sections, i.e., less than 125 meters. Derricks below 125 meters can be hoisted as a whole from the inside of the tower, while derricks above 125 meters should be hoisted as a whole from the outside of the tower.
[0044] 3) Platform Installation For ancillary facilities located more than 5 meters from the center of the tower, a gantry crane can be used to hoist them together or separately during the hoisting of that section. For ancillary facilities located within 5 meters from the center of the tower, the gantry crane must be removed first, and then the TD11 single-arm gantry crane on the tower body must be used to hoist them layer by layer from bottom to top.
[0045] 4) Installation of derrick connectors and handrail ropes The derrick is connected to the tower section and installed synchronously with the derrick's upward installation progress. During installation, the straightness of the derrick should be monitored and adjustments made accordingly.
[0046] The handrail ropes designed and configured for the horizontal pipes of the tower body are installed simultaneously with the tower erection. After the entire tower is installed, all handrail ropes should be inspected and tightened.
[0047] 5) Installation of the spiral staircase and climbing machine inside the derrick Climbing machines are installed on the outside of the derrick, while spiral staircases and rest platforms are located inside. It should be noted that the climbing machine rails are all installed on the larger side of the track.
[0048] After the single-rocker-arm derrick is installed, the hoisting height is below 125 m, and the standard sections are hoisted from inside the tower body, with each section being 4 m-4.5 m high. Above 125 m, the standard sections are hoisted from outside the tower body from the top of the tower to the installation position. All the hoisting of the large-span tower derrick is carried out in the form of integral hoisting of standard sections of 4 m-4.5 m, reducing the setting of the in-place control ropes, and obviously improving the safety and operability of the operation. The application provides a special device and method for hoisting the large-span tower derrick, and improves the construction efficiency by 50%. After the installation is completed, the large-span tower is as shown in FIG. 8. Figure 11
[0049] The above description of the application and its embodiments is illustrative and not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it, without departing from the spirit of the application, similar structural forms and embodiments can be designed without creativity, which should belong to the protection scope of the application.
Claims
1. A construction method for using a single-arm jib for hoisting large-span derricks, characterized in that: Includes the following steps: 1) Single rocker arm pole installation; 1.1) Set auxiliary lifting points at the end of the grounding wire crossarm; Two Φ19.5x64m steel wire ropes are installed at the intersection of the main pipes at the top of the crossarms at both ends of the ground wire. They are connected with 10-ton shackles and a 6-ton lever hoist is used for tension adjustment. The lever hoist at the main lifting point Φ19.5 steel wire rope 1 is adjusted to tighten the rope length until the top of the tower is 5m high. Set up a Φ19.5 steel wire rope 2 and adjust the lever hoist to tighten the rope length to about 4m above the top of the tower; set up a 5-ton lifting pulley as a V-sleeve and hang it on the main lifting point Φ19.5 steel wire rope 1; set up a 5-ton steering pulley on another Φ19.5 steel wire rope 2; and pass the lifting steel wire rope through the 5-ton steering pulley to the ground lifting winch. 1.2) Install connector A (150) and connector B (180); connector A (150) and the two connectors B (180) are respectively installed on the main body of the tower top; 1.3) The transition section (140) is hoisted as a whole onto the connecting seat A (150) and connected with a Ф40*120 pin; 1.4) Install and connect the upper support (120), lower support (130) and arm root section (111) on the ground, hoist the whole assembly onto the transition section (140) and connect it with a Ф40*120 pin; 1.5) Lifting boom head section (112); 1.6) Hoisting telescopic boom (170); After the telescopic rod (170) is adjusted to the required length, it is hoisted and connected to the lower support (130) and the connecting seat B (180) with a Φ45*146 pin. 1.7) Install lifting ropes and hooks (160); Using a Φ10x500m DuPont wire rope, the hoisting cable is connected to the Φ15 lifting wire rope via the lower support pulley, the boom root pulley, the boom head pulley, a 3t turning wheel from the outside of the tower to the tower leg, and a 3-ton motorized winch on the ground. The DuPont wire rope is connected to the Φ15 lifting wire rope using a 3-ton anti-bending connector. The DuPont wire rope is pulled on the ground using a 3-ton motorized winch to fully thread the lifting wire rope through the pulley block. The Φ15 lifting wire rope is pulled to the ground and secured with a wire clamp. The 3-ton anti-bending connector is then removed, and the lifting wire rope is connected to the hook. 2) Derrick hoisting; 2.1) For sections below 12 (i.e., height below 125 meters), the derrick shall be hoisted as a whole from inside the tower, using two 3t slings at the hoisting points and 13 DuPont wire as the retaining rope; 2.2) For towers over 125 meters, the derrick is hoisted as a whole from the outside of the tower using a remote control to rotate the single rocker arm boom to the outside of the tower. 13 DuPont wire is used as the retaining rope. 3) Platform installation; For auxiliary facilities located more than 5 meters from the center of the tower, a gantry crane can be used to hoist them together or separately during the hoisting of that section. For auxiliary facilities located within 5 meters from the center of the tower, the gantry crane must be removed and the tower body TD11 single rocker arm gantry crane must be used to hoist them layer by layer from bottom to top. 4) Installation of derrick connectors and handrail ropes; The derrick is connected to the tower section and installed synchronously with the derrick's upward installation progress. During installation, the straightness of the derrick should be monitored and adjustments made accordingly. The handrail ropes of the tower body horizontal pipe are installed simultaneously with the tower erection. After the entire tower is installed, all handrail ropes are inspected and tightened. 5) Installation of the spiral staircase and climbing machine inside the derrick; Climbing machines are installed on the outside of the derrick, while spiral staircases and rest platforms are installed inside the derrick.
2. The construction method for a single-arm gantry crane for hoisting a large-span derrick according to claim 1, characterized in that: The single rocker arm boom includes a boom (110), one end of which is connected to an upper support (120). A lower support (130) is provided below the upper support (120), a transition section (140) is provided below the lower support (130), and a connecting seat A (150) is provided below the transition section (140). Connector A (150) is horizontally connected to two telescopic rods (170), and the telescopic rods (170) are provided with connectors B (180) at their heads; the two telescopic rods (170) are at an angle of 90°, and connectors A (150) and two connectors B (180) are respectively installed on the main members of the corresponding tower top; The other end of the boom (110) is connected to a hook (160); the bottom surface of the boom (110) is provided with a slewing support (190), which is connected to the upper support (120).
3. A single-arm boom for hoisting large-span derricks according to claim 2, characterized in that: The boom (110) includes a boom root section (111) and a boom head section (112). The boom root section (111) has hinge points at both ends. The top surface of the upper support (120) has a column (121), and the column (121) and the slewing bearing (190) are respectively hinged at the corresponding hinge points.
4. A single-arm boom for hoisting large-span derricks according to claim 3, characterized in that: A boom platform (122) is provided on one side of the upper support (120), and a railing (123) is provided on the boom platform (122). A hydraulic control system is installed inside the railing (123), and the hydraulic control system is used to control the movement of the boom (110).
5. A single-arm boom for hoisting large-span derricks according to claim 4, characterized in that: The telescopic rod (170) includes a first connector (171), the first connector (171) is connected to a first support rod (172), the first support rod (172) is fitted with a second support rod (173), and the second support rod (173) is connected to a second connector (174).
6. A single-arm boom for hoisting large-span derricks according to claim 5, characterized in that: The first connector (171) is connected to connector A (150), and the second connector (174) is connected to connector B (180).
7. A construction method for a single-arm gantry crane for hoisting a large-span derrick according to claim 6, characterized in that: In step 1.7), Φ15 steel wire ropes are used for all lifting ropes.
8. A construction method for a single-arm gantry crane for hoisting a large-span derrick according to claim 7, characterized in that: In step 1.7), after the lifting rope is installed, it should be carefully checked whether the winding direction is correct and there should be no rope tangling. Otherwise, it should be unwound and re-wound.
9. A construction method for a single-arm gantry crane for hoisting a large-span derrick according to claim 8, characterized in that: In step 1.7), ensure that the outer spacer of the luffing cylinder is installed in place before hoisting.
10. A construction method for a single-arm gantry crane for hoisting a large-span derrick according to claim 9, characterized in that: In step 2.2), when the derrick is hoisted as a whole from the outside of the tower, the control rope at the point where the hoisting components are tied should use a single DuPont wire. Considering the worst-case scenario, the angle between the single DuPont wire and the ground should be 60° to ensure the smooth lifting of the derrick. The formula for calculating the resultant static tension of the control rope is: ； The angle between the DuPont cable and the ground. The angle between the lifting wire rope and the plumb line; The vertical component of the force on the DuPont wire is 3.1 * sin60° = 2.6 kN.