Method for installing and removing super-heavy cross beam of steep terrain cable suspension tower

Abstract

The application discloses a steep terrain cable crane tower super heavy cross beam installation and removal method, which comprises the following steps: step S1, building a foundation; step S2, prefabricating components of the cable crane tower and cross beams of the cable crane tower; step S3, building a tower crane; step S4, building the cable crane tower; step S5, hoisting an inclined support for fixing a split beam; step S6, hoisting the split beam to the top of a stand column; step S7, hoisting the remaining split beams to the top of the stand column by using the tower crane, and manufacturing the cross beams of the cable crane tower; step S8, after the cable crane is used, hoisting the split beams to the flat ground of the slope; and step S9, removing the cable crane tower, hoisting the components of the cable crane tower to the flat ground of the slope, and then removing the tower crane. The application has the effect of hoisting the cross beams to the cable crane tower under the steep terrain.

Description

Technical Field

[0001] This invention relates to the field of cable crane tower beam installation and removal, and in particular to a method for installing and removing heavy-duty cable crane tower beams on steep terrain. Background Technology

[0002] To construct a transportation bridge spanning a river or canyon, it is usually necessary to first build cable-stayed crane towers at both ends of the bridge, then install crossbeams on the cable-stayed crane towers, followed by installing sliding rails, pulley blocks, cables, and trolleys on the crossbeams to support the cable-stayed cranes, and finally assemble the transportation bridge using the cable-stayed cranes.

[0003] The existing method for installing and dismantling cable-stayed crane tower beams typically involves first prefabricating the cable-stayed crane tower components and beams. Then, tower cranes are erected at both ends along the length of the installation location. The tower cranes are used to lift the cable-stayed crane components to the installation location and assemble them into a cable-stayed crane tower. Next, the tower cranes on both sides along the length of the cable-stayed crane tower are used to lift the beams to the top of the cable-stayed crane tower. After the cable-stayed crane is in use, the tower cranes are used to lift the beams down to the flat ground on the slope. Then, the cable-stayed crane tower is dismantled, and the tower crane components are lifted down to the flat ground on the slope. Finally, the tower crane is dismantled.

[0004] Erecting a tower crane on a steep hillside presents challenges. The mountain's terrain affects the crane's turning, and the limited flat area excavated on the steep slope restricts the crane's operational space, resulting in only one tower crane being able to be installed. However, due to the lever principle, the lifting capacity decreases as the crane's boom moves further from the top of the tower. Consequently, when only one tower crane is used to lift a crossbeam onto a cable-stayed crane tower, it becomes difficult to lift the crossbeam from a position where the crane's boom is far from the top of the tower. Therefore, there is still room for improvement. Summary of the Invention

[0005] In order to hoist crossbeams onto cable-stayed towers in steep terrain, this application provides a method for installing and dismantling heavy-duty crossbeams on cable-stayed towers in steep terrain.

[0006] This application provides a method for installing and dismantling the heavy-duty crossbeam of a cable-stayed tower in steep terrain, employing the following technical solution:

[0007] A method for installing and dismantling the heavy-duty crossbeam of a cable-stayed crane tower on steep terrain includes the following steps:

[0008] Step S1: Construct the foundation for the cable crane tower and the tower crane itself;

[0009] Step S2: Prefabricated cable crane tower components and cable crane tower crossbeams. The tower includes at least two columns perpendicular to the foundation plane and a fixing beam perpendicular to the columns for fixing the columns. The crossbeam is composed of several segments.

[0010] Step S3: Erect the tower crane, which is located at one end of the cable crane tower along its length.

[0011] Step S4: Construct the cable crane tower;

[0012] Step S5: Use a tower crane to hoist the diagonal bracing used to fix the sub-beams to the top of the column;

[0013] Step S6: First, use a tower crane to hoist the sub-beam to the top of the column, then fix the sub-beam to the top of the column, and then fix the end of the sub-beam away from the column to the end of the diagonal brace away from the column.

[0014] Step S7: Use a tower crane to hoist the remaining sub-beams to the top of the column, and then fix the connection between the sub-beams to form the crossbeams of the cable-stayed tower.

[0015] Step S8: After the cable crane is used, the crossbeam of the cable crane tower is split into sub-beams. Then the sub-beams are removed from the diagonal braces and columns, and then the tower crane is used to lift the sub-beams onto the flat ground on the slope.

[0016] Step S9: Dismantle the cable crane tower. Use a tower crane to lift the components of the cable crane tower to the flat ground on the slope, and then dismantle the tower crane.

[0017] By adopting the above technical solution, a tower crane is used to hoist the sub-beams to the top of the column, and then the sub-beams are spliced ​​and fixed to form a crossbeam. This allows a single tower crane to complete the hoisting of the crossbeam, reducing the risk of collisions between the crane booms and the mountainside, which is common when using two tower cranes. This reduces the need for maintenance due to collisions between the crane booms and the mountainside. Simultaneously, it reduces the area of ​​flat land that needs to be excavated on steep slopes, thus reducing the amount of work involved in leveling the slope. Simultaneously, by first installing diagonal braces onto the columns, then installing the sub-beams onto the top of the columns, and finally fixing the sub-beams to the top of the columns, while fixing the end of the sub-beam furthest from the column to the end of the diagonal brace furthest from the column, the columns and diagonal braces respectively fix the two ends of the sub-beams along their length. This reduces the likelihood of the diagonal brace being fixed at one end to the top of the column while the other end is suspended, which could easily break under gravity at the fixed point between the sub-beam and the top of the column. This reduces the need for repairs to the sub-beams and columns in case of breakage at the fixed point. Furthermore, after all the sub-beams are installed to the top of the columns to form a crossbeam, the diagonal braces help improve the stability of the crossbeam and the columns.

[0018] Preferably, the diagonal brace is detachably connected to the column, the sub-beam is detachably connected to both the column and the diagonal brace, and the sub-beams are detachably connected to each other.

[0019] By adopting the above technical solution, and by setting up diagonal braces, detachable sub-beams connected to the columns, and detachable connections between sub-beams, when the cable crane is finished and the crossbeam needs to be dismantled, the crossbeam is split into sub-beams. These sub-beams are then removed from the diagonal braces and columns, allowing the tower crane to hoist them from the top of the columns to the slope plane. The diagonal braces are then removed from the columns, allowing the tower crane to hoist the sub-beams from the end of the column furthest from the ground to the edge plane. This facilitates the rapid dismantling of the crossbeams and diagonal braces, thus accelerating the dismantling of the cable crane tower. Furthermore, by setting up detachable connections between diagonal braces and columns, sub-beams and diagonal braces, and between sub-beams, the need for welding at the connections between sub-beams and columns, diagonal braces and columns, diagonal braces and sub-beams, and between sub-beams is reduced. Welding is labor-intensive and slow, which slows down the installation of the crossbeams. Meanwhile, by breaking down the crossbeam into sub-beams and removing them from the columns, the weight of each sub-beam is kept consistent with its weight before installation on the top of the column. This reduces the likelihood of the weight of the sub-beams changing when they are cut from the crossbeam using gas cutting, which could lead to difficulties in lifting the sub-beams from the top of the column to the slope plane due to increased weight or the need for multiple lifting operations due to the increased number of sub-beams. This reduces obstacles to crossbeam dismantling and improves dismantling efficiency.

[0020] Preferably, in step S5, one end of the bracket is first fixed to the diagonal brace, and then the diagonal brace and bracket are hoisted to the top of the column using a tower crane. Subsequently, one end of the diagonal brace is fixed to the column, and at the same time, the end of the bracket away from the diagonal brace is fixed to the column.

[0021] By adopting the above technical solution, the bracket is first fixed to the diagonal brace. Then, a tower crane is used to hoist the diagonal brace and bracket to the column. Subsequently, the diagonal brace is fixed to the column, and the end of the bracket furthest from the diagonal brace is fixed to the column. This creates a triangular frame formed by the column, diagonal brace, and bracket after the diagonal brace and bracket are installed on the column, which helps improve the stability of the diagonal brace and the beam. Furthermore, when one end of the diagonal brace is fixed to the column but the other end is not, the connection between the diagonal brace and the column bears the entire weight of the diagonal brace. By setting the bracket, the situation where one end of the diagonal brace is fixed to the column and the other end is suspended is reduced, which can easily lead to breakage at the connection under gravity.

[0022] Preferably, the cow leg is detachably connected to the column.

[0023] By adopting the above technical solution, the time spent installing the brackets to the columns due to the use of electric welding for fixing is reduced, which is beneficial to improving the efficiency of bracket installation to the columns. At the same time, it reduces the possibility of damage to the brackets and columns caused by cutting them from the columns with gas cutting, which would hinder the reuse of the brackets and columns.

[0024] Preferably, in step S7, a fixed frame for installing the installation mechanism for the remaining sub-beams is first hoisted to the top of the column using a tower crane. Then, the fixed frame is fixed to the sub-beams fixed to the top of the column. Next, the installation mechanism for installing the remaining sub-beams is hoisted to the fixed frame using a tower crane. Then, the remaining sub-beams are hoisted to the sub-beams fixed to the top of the column near the tower crane using a tower crane. Subsequently, the installation mechanism is hoisted to the top of the cable-stayed tower frame. Finally, the connection between the sub-beams is fixed to form the crossbeams of the cable-stayed tower frame.

[0025] By adopting the above technical solution, the large spacing between the beams fixed to the top of the column, coupled with the decreasing lifting capacity of the tower crane's boom further from the top of the tower crane, necessitates dividing the crossbeam into multiple segments. When one end of a beam being hoisted is fixed to the beam fixed to the top of the column along its length, while the other end is suspended, the suspended beam is prone to falling under gravity. By setting up an installation mechanism that ensures the length of the un-hoisted beam matches the spacing between the beams fixed to the top of the column, the safety of hoisting the beams is improved, and the efficiency of installing the crossbeams to the top of the column is also increased.

[0026] Preferably, in step S7, the fixing positions of the fixing frame and the sub-beam are located at both ends of the crossbeam along the length direction and on both sides of the sliding track installation position along the width direction.

[0027] By adopting the above technical solution, the fixed positions of the fixing frame and the sub-beam are set on the side of the crossbeam away from the column and on both sides of the sliding rail installation position along the width direction. This makes it less likely for the fixing frame to obstruct the installation of the sliding rail and the installation of the pulley block slidably connected to the sliding rail. At the same time, when it is necessary to install the sliding rail and pulley block, the tower crane is first used to hoist the sliding rail and pulley block to the top of the crossbeam, and then the installation mechanism is used to install the sliding rail and pulley block on the top of the crossbeam. This allows the installers to quickly install the sub-beam using the installation mechanism, which helps to improve the installation efficiency of the sliding rail and pulley block, thereby improving the installation progress of the cable crane.

[0028] Preferably, in step S7, the support frames at both ends of the fixed frame along its length are first hoisted onto the sub-beams closer to and farther from the tower crane using a tower crane. Then, the support frames and sub-beams are fixed. Next, the slide rails of the fixed frame are installed onto the support frames using a tower crane. Then, the slide rails and support frames are fixed. Then, the installation mechanism for installing the remaining sub-beams is hoisted onto the fixed frame using a tower crane. Then, the remaining sub-beams are hoisted onto the sub-beams fixed to the top of the column near the tower crane using a tower crane. Then, the installation mechanism is hoisted onto the top of the cable-stayed tower frame using the column. Finally, the connection between the sub-beams is fixed to form the crossbeams of the cable-stayed tower frame.

[0029] By adopting the above technical solution, the entire fixed frame is lifted by a tower crane onto the beams fixed to the column. When the fixed frame needs to be installed onto the beams fixed to the column, the tower crane needs to lift the fixed frame away from the tower crane. By using the tower crane to lift the beams fixed to the column separately, the lifting capacity of the fixed frame is reduced as the distance between the tower crane's boom and the top of the tower crane decreases. This reduces the risk of the fixed frame exceeding the lifting capacity of the tower crane's boom when lifting the fixed frame away from the tower crane, which could easily cause the tower crane to tip over. This improves the safety of the tower crane during operation.

[0030] Preferably, the fixing frame is detachably connected to the beam.

[0031] By adopting the above technical solution, and by setting a fixed frame that can be detachably connected to the sub-beam, it is beneficial to improve the speed of the fixed frame's assembly and disassembly, thereby reducing the impact of the fixed frame's assembly and disassembly on the project progress and improving the overall assembly and disassembly efficiency of the cable crane.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. By using segmented beams, the installation of the crossbeams can be completed with a single tower crane, reducing the need for two tower cranes. This is because the mountainside obstructs the crane's rotation, and the large range of motion required for the crane's boom to rotate increases the risk of collisions with the mountainside. This reduces the need for repairs due to crane boom collisions. It also reduces the area of ​​flat ground that needs to be excavated on steep slopes, thus reducing the workload of leveling the slope. Furthermore, by using diagonal bracing, the columns and diagonal braces are fixed to both ends of the segmented beams along their length. This reduces the risk of breakage at the fixed point between the segmented beam and the column under gravity, where one end of the diagonal brace is fixed to the top of the column while the other end is suspended. This reduces the need for repairs due to breakage at the fixed point between the segmented beam and the column. Finally, after all the segmented beams are installed to form the crossbeam, the diagonal bracing improves the stability of the crossbeam and the column.

[0034] 2. The fixing frame and installation device ensure that the length of the un-hoisted sub-beams is consistent with the spacing between the sub-beams fixed to the top of the column, which helps to improve the safety of hoisting the sub-beams and also helps to improve the efficiency of installing the crossbeams to the top of the column. Attached Figure Description

[0035] Figure 1 This is a schematic diagram showing the completed installation of the cable crane tower and sliding rails.

[0036] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Column; 2. Tower crane; 3. Horizontal beam; 31. Intermediate beam; 311. Long beam; 312. Short beam; 4. Fixed frame; 41. Slide rail; 411. Electric hoist; 5. Fixed base; 51. Diagonal brace; 52. Corbel; 6. Sliding rail. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0040] This application discloses a method for installing and dismantling a heavy-duty crossbeam of a cable-stayed crane tower on steep terrain, including the following steps:

[0041] Step S1: According to the drawings, use an excavator to excavate the foundation of the cable crane tower and the foundation of tower crane 2. Then, build a steel cage and pour the formwork on the foundation. Next, use a pump truck to pour cement concrete into the formwork. After the cement concrete solidifies, the foundation of the cable crane tower and the foundation of tower crane 2 are formed.

[0042] Step S2: Send the drawings of the cable-stayed crane tower and tower crane 2 to the manufacturing plant. Prefabricate the components of the cable-stayed crane tower and the crossbeams 3 of the cable-stayed crane tower at the manufacturing plant. The crossbeams 3 are composed of several segmented beams. In this embodiment, the cable-stayed crane tower includes two columns 1 fixed to the slope plane and a fixed beam perpendicular to the columns 1 and fixedly connected to the two columns 1 at both ends. In this embodiment, the segmented beams include a near beam fixed to the top of the column 1 near the tower crane 2, a far beam fixed to the top of the column 1 away from the tower crane 2, and an intermediate beam 31 installed between the near beam and the far beam.

[0043] Step S3: Erect tower crane 2, which is located at one end of the cable crane tower along its length.

[0044] Step S4: Use tower crane 2 to lift the components and fixing beams of the cable crane tower from the foundation of the cable crane tower to construct the cable crane tower.

[0045] Step S5: Use tower crane 2 to hoist the diagonal brace 51 for fixing the beam to the top of column 1. In this embodiment, the diagonal brace 51 is a steel pipe. The specific operation steps are as follows:

[0046] Step S51: According to the drawings, weld one end of the bracket 52 along its length to the diagonal brace 51 using electric welding. In this embodiment, the bracket 52 is a steel pipe, and the position where the bracket 52 is welded to the diagonal brace 51 is located at one end of the diagonal brace 51 along its length.

[0047] Step S52: According to the drawings, first weld flanges to both ends of the diagonal brace 51 along the length direction using electric welding, and then weld flanges to the end of the bracket 52 away from the diagonal brace 51 using electric welding to make a fixed seat 5. In this embodiment, there are 6 fixed seats 5.

[0048] Step S53: Use tower crane 2 to hoist the fixing seat 5 to the end of column 1 away from the ground. Then adjust the fixing seat 5 until the flange fixed to the end of the diagonal brace 51 near column 1 and the flange fixed to the bracket 52 are directly opposite the flange fixed to column 1. Then use an electric wrench to screw the high-strength bolts into the through holes of the flanges to fix the fixing seat 5 to column 1. In this embodiment, the fixing seat 5 is located on one side of the two columns 1 facing each other. Each column 1 is fixed with three fixing seats 5. The three fixing seats 5 fixed on the same column 1 are located on both sides of the column 1 along the width direction and in the middle of the column 1 along the width direction.

[0049] Step S6: First, use tower crane 2 to hoist the sub-beam to the top of column 1, then fix the sub-beam to the top of column 1, and then fix the end of the sub-beam away from column 1 to the end of the diagonal brace 51 away from column 1. The specific operation steps are as follows:

[0050] Step S61: First, use tower crane 2 to hoist the distant beam to the top of the column 1 away from tower crane 2. In this embodiment, the length of the distant beam is less than the length of the column 1. Then, adjust the position of the distant beam until the flange at the bottom of the distant beam is directly opposite the flange fixed to the top of the column 1 away from tower crane 2, and the end of the distant beam along its length away from tower crane 2 is flush with the end of the column 1 along its length away from tower crane 2. Then, operate tower crane 2 to place the distant beam to the top of the column 1 away from tower crane 2. Then, use an electric wrench to screw high-strength bolts into the through holes of the flange, fixing the flange fixed to the bottom of the distant beam to the flange fixed to the top of the column 1 away from tower crane 2. The fixing sequence is: first, fix the flanges fixed to the four corners of the distant beam to the flanges fixed to the four corners of the column 1 away from tower crane 2, and then fix the remaining flanges. Then, remove the hook of tower crane 2.

[0051] Step S62: First, use tower crane 2 to hoist the approach beam to the top of column 1 near tower crane 2. In this embodiment, the length of the approach beam is greater than the length of column 1. Then, adjust the position of the approach beam until the flange at the bottom of the approach beam is directly opposite the flange fixed to the top of column 1 near tower crane 2, and the flange at the bottom of the approach beam is directly opposite the flange fixed to the diagonal brace 51 and close to the approach beam. The end of the approach beam along its length and close to tower crane 2 is flush with the end of column 1 along its length and close to tower crane 2. Then, operate tower crane 2 to place the approach beam to the top of column 1 near tower crane 2. Then, use an electric wrench to screw high-strength bolts into the through holes of the flange, fixing the flange fixed to the bottom of the approach beam to the flange fixed to the top of column 1 near tower crane 2, and fixing the flange fixed to the bottom of the approach beam to the flange fixed to the diagonal brace 51 and close to the approach beam. The fixing sequence is as follows: First, fix the flange fixed to the diagonal brace 51 to the flange fixed near the beam and away from the tower crane 2. Then, fix the flange fixed near the beam and near the end of the tower crane 2 to the flange fixed to the top of the column 1 near the tower crane 2 and near the end of the tower crane 2. Then fix the remaining flanges. After that, remove the hook of the tower crane 2.

[0052] Step S7: First, use tower crane 2 to hoist the fixing frame 4 to the top of column 1. In this embodiment, the fixing frame 4 consists of support frames installed near and away from the top of the beam, and two slide rails 41 installed on the support frames. The support frames and the fixing positions near and away from the beam are located at both ends of the crossbeam 3 along the length direction and on both sides of the installation position of the slide rails 6 along the width direction. Next, use tower crane 2 to hoist the installation mechanism for installing the intermediate beam 31 to the fixing frame 4, and then use tower crane 2 and the installation mechanism to hoist the intermediate beam 31. The specific operation steps are as follows:

[0053] Step S71: In this embodiment, the support frame consists of two vertical poles perpendicular to the length direction of the beam 3, a horizontal bar fixed to the vertical poles, and a diagonal bar fixed to the vertical poles. A flange is fixed to one end of each vertical pole along its length. Both ends of the horizontal bar along its length are fixed to the ends of the two vertical poles away from the flanges, respectively. Both ends of the diagonal bar along its length are fixedly connected to the vertical poles and the horizontal bar, respectively. There are two diagonal bars, and each diagonal bar is located at the fixed connection point between the two vertical poles and the horizontal bar. First, use tower crane 2 to hoist a support frame away from the top of the beam. Adjust the angle of the support frame until the two flanges fixed to the support frame are directly opposite the two flanges fixed to the top of the beam. Then, operate tower crane 2 to place the support frame away from the top of the beam. Finally, use an electric wrench to screw high-strength bolts into the flanges fixed to the support frame and the flanges fixed to the beam.

[0054] Step S72: First, use tower crane 2 to hoist a support frame near the top of the beam. Adjust the angle of the support frame until the two flanges fixed to the support frame are directly opposite the two flanges fixed near the top of the beam. Then, operate tower crane 2 to place the support frame near the top of the beam. Then, use an electric wrench to screw the high-strength bolts into the flanges fixed to the support frame and the flanges fixed to the beam.

[0055] Step S73: First, use tower crane 2 to hoist the two slide rails 41 to the top of the two crossbars. Adjust the slide rails 41 until the two slide rails 41 are located at both ends of the crossbar along the length direction and the length direction of the two slide rails 41 is parallel to the length direction of the crossbeam 3. Then, use electric welding to weld the connection between the slide rails 41 and the crossbar.

[0056] Step S74: Use the tower crane's two-way slide rail 41 to hoist the installation mechanism. In this embodiment, the installation mechanism is an electric hoist 411.

[0057] Step S75: In this embodiment, the intermediate beam 31 is divided into a longer beam 311 and a shorter beam 312 along the width direction. The longer beam 311 and the shorter beam 312 are fixedly connected using flanges. First, the tower crane 2 is used to hoist the longer beam 311 towards the top of the beam. Then, the electric hoist 411 is used to hoist the beam between the beam near the beam and the beam away from the beam, until the flanges fixed at both ends of the longer beam 311 are directly opposite the flanges fixed at the end of the longer beam near the beam and the flanges fixed at the end of the longer beam away from the beam. The flange fixed at the bottom of the longer beam 311 is directly opposite the flange fixed on the diagonal brace 51 away from the tower crane 2. Then, use an electric wrench to screw the high-strength bolts into the through holes of the flanges fixed to the long beam 311, the flanges near the beam, and the flanges away from the beam. Then, use an electric wrench to screw the high-strength bolts into the through holes of the flanges fixed to the bottom of the long beam 311 and the flanges fixed to the diagonal brace 51 away from the tower crane 2.

[0058] Step S76: First, use tower crane 2 to hoist the short beam 312 close to the top of the beam. Then, use electric hoist 411 to hoist it between the beam close to the beam and the beam far away, until the flanges fixed at both ends of the short beam 312 along the length direction are respectively aligned with the flanges fixed at the end of the short beam close to the beam and the flanges fixed at the end of the short beam close to the beam far away from the beam. The flange fixed at the bottom of the end beam is aligned with the flange fixed on the diagonal brace 51 far away from the tower crane 2. The flange fixed on the side of the short beam 312 close to the long beam 311 is aligned with the flange fixed on the side of the long beam 311 close to the short beam 312. Then, using an electric wrench, high-strength bolts are screwed into the through holes of the flanges fixed to the end beam, the flanges near the beam, and the flanges away from the beam. Then, using an electric wrench, high-strength bolts are screwed into the through holes of the flanges fixed to the bottom of the end beam and the flanges fixed to the diagonal brace 51 away from the tower crane 2. Next, using an electric wrench, high-strength bolts are screwed into the through holes of the flanges fixed to the side of the short beam 312 near the long beam 311 and the flanges fixed to the side of the long beam 311 near the short beam 312, thus forming the crossbeam 3.

[0059] Step S8: After the cable crane has been used, dismantle cable tower crane 2. The specific operating steps are as follows:

[0060] Step S81: First, use the hook of the electric hoist 411 to fix the long beam 311 part of the crossbeam 3. Then, use an electric wrench to remove the high-strength bolts fixed on the crossbeam 3 and remove the long beam 311 from the crossbeam 3. Then, use the electric hoist 411 to hoist the long beam 311 to the end near the top of the beam and near the tower crane 2. Then, use the tower crane 2 to hoist the long beam 311 to the flat ground on the slope.

[0061] Step S82: First, use the hook of the electric hoist 411 to fix the short beam 312. Then, use an electric wrench to remove the high-strength bolts used to fix the short beam 312. Remove the short beam 312 from the beam near and away from the beam. Then, use the electric hoist to lift the short beam 312 to the end near the top of the beam and near the tower crane 2. Then, use the tower crane 2 to lift the short beam 312 to the flat ground on the slope.

[0062] Step S83: First, use tower crane 2 to hoist electric hoist 411 to the flat ground of the slope. Then, use gas cutting to cut slide rail 41 from the support frame. Then, use tower crane 2 to hoist slide rail 41 to the flat ground of the slope.

[0063] Step S84: Use an electric wrench to remove the high-strength bolts used to fix the support frame, and then use tower crane 2 to hoist the support frame to the flat ground on the slope.

[0064] Step S85: First, use the hook of tower crane 2 to fix the beam near the slope. Then, use an electric wrench to remove the high-strength bolts that are higher than those used to fix the beam near the slope. After that, use tower crane 2 to lift the beam near the slope to the flat ground.

[0065] Step S86: First, use the hook of tower crane 2 to fix the beam away from the ground. Then, use an electric wrench to remove the high-strength bolts that are higher than the fixed beam away from the ground. After that, use tower crane 2 to lift the beam away from the ground to the slope.

[0066] Step S9: Dismantle the cable crane tower. Use tower crane 2 to lift the components of the cable crane tower to the flat ground on the slope, and then dismantle tower crane 2.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for installing and dismantling a heavy-duty crossbeam of a cable-stayed crane tower on steep terrain, characterized in that, Includes the following steps: Step S1: Construct the foundation for the cable crane tower and the foundation for the tower crane (2); Step S2: Prefabricated cable crane tower components and cable crane tower crossbeams (3), the tower includes at least two columns (1) perpendicular to the foundation plane and a fixing beam perpendicular to the columns (1) for fixing the columns (1), the crossbeam (3) is composed of several segments of beams; Step S3: Erect tower crane (2), which is located at one end of the cable crane tower along its length. Step S4: Construct a cable crane tower, which includes at least two columns (1) perpendicular to the foundation plane and a fixing beam perpendicular to the columns (1) for fixing the columns (1); Step S5: Use tower crane (2) to hoist the diagonal bracing (51) for fixing the sub-beam to the top of column (1); Step S6: First, use the tower crane (2) to hoist the sub-beam to the top of the column (1), then fix the sub-beam to the top of the column (1), and then fix the end of the sub-beam away from the column (1) to the end of the diagonal brace (51) away from the column (1); Step S7: First, use the tower crane (2) to hoist the mounting frame for installing the remaining sub-beams onto the top of the column (1). The mounting frame (4) consists of support frames installed near and away from the top of the beam, and two slide rails (41) installed on the support frames. Use the tower crane (2) to hoist the support frames at both ends of the mounting frame along the length direction onto the sub-beams near and away from the tower crane (2), respectively. Then, fix the support frames and sub-beams. Next, use the tower crane (2) to install the slide rails (41) of the mounting frame onto the support frames. Then, fix the slide rails (41) and support frames. Then fix the fixing frame to the sub-beam fixed to the top of the column (1). The fixing positions of the fixing frame (4) and the sub-beam are located at both ends of the crossbeam (3) along the length direction and on both sides of the sliding rail (6) along the width direction. Then use the tower crane (2) to hoist the installation mechanism for installing the remaining sub-beams to the fixing frame. Then use the tower crane (2) to hoist the remaining sub-beams to the sub-beam fixed to the top of the column (1) near the tower crane (2). Then use the installation mechanism to hoist them to the top of the cable crane tower of the column (1). Then fix the connection between the sub-beams to form the crossbeam (3) of the cable crane tower. Step S8: The diagonal brace (51) is detachably connected to the column (1), the sub-beam is detachably connected to the column (1) and the diagonal brace (51), and the sub-beams are detachably connected to each other; after the cable crane is used, the crossbeam (3) of the cable crane tower is split into sub-beams, and then the sub-beams are removed from the diagonal brace (51) and the column (1), and then the tower crane (2) is used to lift the sub-beams to the flat ground on the slope; Step S9: Dismantle the cable crane tower and use the tower crane (2) to lift the components of the cable crane tower to the flat ground on the slope, and then dismantle the tower crane (2).

2. The method for installing and dismantling the heavy-duty crossbeam of a cable-stayed tower on steep terrain according to claim 1, characterized in that, In step S5, one end of the bracket (52) is first fixed to the diagonal brace (51), and then the diagonal brace (51) and the bracket (52) are hoisted to the top of the column (1) using the tower crane (2). Then, one end of the diagonal brace (51) is fixed to the column (1), and at the same time, the end of the bracket (52) away from the diagonal brace (51) is fixed to the column (1).

3. The method for installing and dismantling the overloaded crossbeam of a cable-stayed tower on steep terrain according to claim 2, characterized in that, The cow leg (52) is detachably connected to the column (1).

4. The method for installing and dismantling the heavy-duty crossbeam of a cable-stayed tower on steep terrain according to claim 3, characterized in that, The fixing frame is detachably connected to the beam.

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