CN105621280B - The apparatus and method for mounting and dismounting crane arm - Google Patents

Abstract

The invention discloses a device and method for installing and dismounting a lifting arm, which comprises a main pole, a transverse steel beam, a longitudinal steel beam, a luffing trolley, a pole crane, a moving pulley block, an luffing steel wire rope and a lifting steel wire rope. The pole crane is fixed on the base of the pole crane. The horizontal steel beam, the longitudinal steel beam and the lower end of the main pole together form a semi-closed rectangular area. The luffing trolley is clamped in the semi-closed rectangular area. The gourd is connected, and one end is fixed on the pole crane, the other end is fixed on the main pole, one end of the lifting wire rope is fixed on the main pole, and the other end is fixed on the pole crane after passing through the movable pulley block. The present invention uses the luffing trolley to match the pole crane and the movable pulley block to install and disassemble the boom, fully utilizes its own space and advantages, can hoist the boom away from the tower crane at one time, and has a simple structure for installation and disassembly , easy to operate and highly feasible.

Description

Apparatus and method for mounting and dismounting a jib

technical field

The invention relates to the technical field of hoisting machinery construction, in particular to a device and method for installing and dismounting a jib by using a luffing trolley.

Background technique

With the acceleration of socialist construction, more and more tower cranes cannot be disassembled normally due to the use of tower cranes in high-rise and super high-rise buildings, errors in the positioning of tower crane foundations, and building overhangs, and the vast majority of tower cranes that need to be dismantled in the air The jib extends tens of meters from the edge of the building, and general auxiliary dismantling equipment cannot hoist the jib away from the tower crane at one time and connect it to successfully place the roof layer, so the operation efficiency is low and the labor cost is high.

Contents of the invention

Aiming at the deficiencies in the above technologies, the present invention provides a device and method for installing and dismounting a boom by using a luffing trolley.

In order to achieve the above object, the present invention provides a device for installing and dismounting the boom, including the main beam, the transverse steel beam, the longitudinal steel beam, the luffing trolley, the pole crane, the moving pulley block, the luffing wire rope and the hoisting wire rope , the longitudinal steel beam is vertically fixed on the main xuan bar by means of pressure rollers and hook wheels, the horizontal steel beam is placed horizontally, and is parallel to the lower end of the main xuan bar, and one end of the horizontal steel beam is connected to the longitudinal steel beam The screw is fixedly connected, and the other end is provided with a pole crane base, and the pole crane is fixed on the pole crane base, and an anti-reclining device is welded behind the pole crane base, and the horizontal steel beam, the longitudinal steel beam and the The lower ends of the main poles together form a semi-enclosed rectangular area, the luffing trolley is fixedly connected with the transverse steel beam through U-shaped bolts, and accommodated in the semi-enclosed rectangular area, and the luffing wire rope is connected with the chain block , and one end is fixed on the pole hanger, and the other end is fixed on the main pole, one end of the lifting wire rope is fixed on the main pole, and the other end passes through the pulley block and is fixed on the pole hanger.

Wherein, the length of the transverse steel beam is 2.5 times as long as the used luffing trolley.

Wherein, the movable pulley block includes a first pulley fixed on the upper end of the main hook rod, a second pulley arranged at the end of the "herringbone" type pickling rod crane, and a third pulley connected with the hook, and the first pulley 1. The second pulley is a fixed pulley, and the third pulley is a movable pulley. One end of the lifting wire rope is fixed on the main rod, and the other end passes through the first pulley, the second pulley and the third pulley and is fixed on the "people" The end of the font grill rod.

Wherein, two luffing trolleys are arranged on the main pole, which are respectively the first luffing trolley and the second luffing trolley, the first luffing trolley is fixed with a first transverse steel beam, and the first luffing trolley The transverse steel beam is fixedly connected with the first longitudinal steel beam, the second transverse steel beam is fixed on the second luffing trolley, the second transverse steel beam is fixedly connected with the second longitudinal steel beam, and the first luffing trolley The trolley moves synchronously with the second luffing trolley.

Wherein, the two ends of the pole crane are respectively fixed on the first pole crane base on the first transverse steel beam and the second pole crane base on the second transverse steel beam through pin shafts.

Wherein, an anti-slip device is also provided in the semi-enclosed rectangular area, and the anti-slip device is fixed to the lower end of the main rod by high-strength bolts.

Wherein, the transverse steel beam and the longitudinal steel beam are made of square or H-shaped steel.

The present invention also provides a method for mounting and dismounting a boom, comprising the steps of:

S1. First determine the weight of the front boom according to the model of the tower crane, the actual height of the main beams on both sides of the luffing trolley of the tower crane, and calculate the relevant parameters, and make the horizontal steel beam and the longitudinal steel beam through square or H-shaped steel;

S2. Set up the pole crane base at one end of the horizontal steel beam, and connect the longitudinal steel beam vertically with bolts at the other end, and fix the longitudinal steel beam at the lower end of the main pole by means of pressure rollers and hook wheels, and the horizontal steel beam and the main pole The lower ends are parallel, and the transverse steel beam, the longitudinal steel beam and the lower end of the main beam jointly form a semi-closed rectangular area, and the luffing trolley is accommodated in the semi-closed rectangular area, and the luffing trolley and the transverse steel beam pass through U-shaped bolts are fixed, and the luffing trolley moves back and forth, thereby driving the transverse steel beam to move back and forth under the action of the pressure roller and the hook wheel;

S3. Install the pole crane. Use a 5T chain hoist and a luffing wire rope to connect the end of the pole crane and the upper end of the main pole. The distance is not less than 5 meters. The 5T chain hoist is used to control the luffing distance of the pole crane. ; Bolt two luffing steel wire ropes at the end of the pole crane and fasten them to the upper end of the longitudinal steel beam. When moving backward, tighten the luffing steel wire ropes to pull the pole crane to the maximum limit and fix it. When the luffing trolley reaches the dismantling position , at the rear of the luffing trolley, use high-strength bolts to clamp a 90-degree anti-slip device at the rear of the luffing trolley to fix the luffing trolley;

S4. Fix the first pulley at the upper end of the main pole, set the second pulley at the end of the "herringbone"-shaped grilling pole, fix one end of the lifting wire rope on the main pole, and pass the other end through the first pulley and the second pulley respectively. After the second pulley and the third pulley connected with the hook, fix it at the end of the pick-up rod crane; pass the lifting wire rope through the lower end of the first pulley and then go down through the second pulley to the third pulley, and then put it on the pick-up bar The end of the crane is fixed to form a moving pulley block, and the lifting arm to be dismantled is fastened to the first pulley with a lifting wire rope, and the lifting wire rope is tightened, and the 5T chain hoist passes through the front and rear positions of the second pulley in the air to reach the disassembly position;

S5. After dismantling a section of the boom, separate the hook from the boom, pull the pole to an angle of 105 degrees, tighten two luffing steel wire ropes on the longitudinal steel beam, and hang a luffing trolley front end 3T chain hoist, the 3T chain hoist controls the speed of the luffing trolley moving backward in the air. When the chain length of the 3T chain hoist is not enough, fix the anti-slip device at the position of the rear roller of the luffing trolley to change The position of the 3T chain hoist ensures that the luffing trolley reaches the destination normally and safely.

Wherein, the length of the transverse steel beam is 2.5 times as long as the used luffing trolley.

Wherein, an anti-dipping device is welded behind the base of the pole crane.

The beneficial effects of the present invention are: compared with the prior art, the present invention uses the luffing trolley to install and disassemble the boom, fully utilizes its own space and advantages, and can hoist the boom away from the tower crane at one time , and successfully placed the roof layer, greatly reducing labor costs and work efficiency.

Description of drawings

Fig. 1 is the schematic diagram under the working state of the device for installing and dismounting the boom of the present invention;

Fig. 2 is a structural schematic diagram of the device for installing and dismounting the boom of the present invention in a backward state;

Fig. 3 is a schematic diagram of the installation structure of the pole crane of the device for installing and dismounting the boom of the present invention;

Fig. 4 is a schematic diagram of the working state of the luffing trolley in the device for installing and dismounting the boom of the present invention;

Fig. 5 is a schematic diagram of the structure of the pole crane in the device for installing and dismounting the boom according to the present invention.

The main component symbols are explained as follows:

1. Main pole 2. Transverse steel beam

3. Longitudinal steel beam 4. Luffing trolley

5. Rod crane 6. Moving pulley block

7. Luffing wire rope 8. Hoisting wire rope

9. Chain block 11. Anti-slip device

21. Gripping pole crane base 22. Anti-tilt device

31. Pressure wheel 32. Hook wheel

61. The first pulley 62. The second pulley

63. The third pulley 91. 5T chain hoist

92. 3T chain block 631. Hook.

Detailed ways

In order to express the present invention more clearly, the present invention will be further described below in conjunction with the accompanying drawings.

Please refer to Fig. 1-Fig. 2, the present invention provides a device for installing and dismounting the boom, including the main pole 1, the transverse steel beam 2, the longitudinal steel beam 3, the luffing trolley 4, the pole crane 5, and the moving pulley block 6. The luffing wire rope 7 and the hoisting wire rope 8, the longitudinal steel beam 3 is vertically fixed on the main pole 1 by means of the pressing wheel 31 and the hook wheel 32, the horizontal steel beam 2 is placed horizontally, and is connected with the main pole 1 The lower ends are parallel, one end of the transverse steel beam 2 is fixedly connected with the longitudinal steel beam 3 by screws, and the other end is welded with a pole crane base 21 for fixing the pole crane 5, and the pole crane is in an inverted "V" shape as a whole. The shape can be integrally formed, or it can be combined by two pole cranes 5. An anti-tilt device 22 is welded behind the base 21 of the pole crane to prevent the phenomenon of backward tilting caused by the pole crane 5 luffing to the maximum angle; The steel girder 2, the longitudinal steel girder 3 and the lower end of the main girder 1 jointly form a semi-closed rectangular area, and the luffing trolley 4 is clamped in the semi-closed rectangular area, and an anti-slip back is also installed in the semi-closed rectangular area. Device 11, the anti-slip device 11 is fixed on the lower end of the main pole 1 through high-strength bolts; the luffing wire rope 7 is connected with the chain hoist 9, and one end is fixed on the pole crane 5, and the other end is fixed on the main pole 1. One end of hoisting wire rope 8 is fixed on the main rod 1, and the other end passes through the moving pulley block 6 and is fixed on the pole hanger 5.

Compared with the prior art, the present invention uses the luffing trolley to match the pole crane and the moving pulley block to install and disassemble the boom, making full use of its own space and advantages, and can lift the boom away from the tower crane at one time The connection and the successful placement of the roof layer greatly reduce the impact of the surrounding high-rise buildings on the disassembly of the boom. The installation and disassembly structure is simple, easy to operate, and highly feasible.

In the present embodiment, the length of the transverse steel girder 2 is 2.5 times longer than the luffing trolley 4 used. The actual height dimension is obtained through calculation. Different tower crane models and main beams have different heights and lengths, and the transverse steel beam 2 and the longitudinal steel beam 3 are all made of square or H-shaped steel.

In this embodiment, the movable pulley block 6 includes a first pulley 61 fixed on the upper end of the main pole 1, a second pulley 62 arranged at the end of the "herringbone"-shaped pick-up rod hanger 5, and a second pulley 62 connected to the hook 631. Three pulleys 63, the first pulley 61 and the second pulley 62 are fixed pulleys, the third pulley 63 is a movable pulley, and the three pulleys cooperate with each other to transport the mechanical arm through the hook 631 very labor-saving.

In this embodiment, there are two types of chain hoists 9, one is a 5T chain hoist, and the other is a 3T chain hoist. The 5T chain hoist is used to install the pole crane 5, and the 3T chain hoist is used to disassemble the pole crane 5. Chain hoist, when installing the pole crane 5, use a 5T chain hoist with the luffing steel wire rope 7 to connect the end of the pole crane 5 and the upper end of the main boom pole 1 of the boom, and control the chain hoist through the 5T chain hoist. The luffing distance of the pole crane 5; after disassembling a section of the jib, separate the hook 631 from the jib, pull the jib crane 5 to an angle of 105 degrees, and tighten the two luffing wire ropes 7 for limit It is fixed on the longitudinal steel beam 3, and a 3T chain hoist is hung on the front end of the luffing trolley, and the speed of the luffing trolley moving backward in the air is controlled by the 3T chain hoist.

The present invention also provides a method for mounting and dismounting a boom, comprising the steps of:

S1. First determine the weight of the front-end boom according to the model of the tower crane, the actual height of the main beams on both sides of the luffing trolley of the tower crane, and calculate the relevant parameters to make the horizontal steel beam 2 and the longitudinal steel beam through square or H-shaped steel. Beam 3;

S2. Set up a pole crane base 21 at one end of the transverse steel beam 2, and vertically connect the longitudinal steel beam 3 with bolts at the other end, and fix the longitudinal steel beam 3 on the lower end of the main beam 1 by means of a pressing wheel 31 and a hook wheel 32 , the transverse steel beam 2 is parallel to the lower end of the main pole 1, the transverse steel beam 2, the longitudinal steel beam 3 and the lower end of the main pole 1 together form a semi-closed rectangular area, and the luffing trolley 4 is accommodated in the semi-closed rectangular area ;

S3. Install the pole crane. Use a 5T chain hoist 91 and the luffing steel wire rope 7 to connect the end of the pole crane 5 and the upper end of the main pole 1. The distance is not less than 5 meters. The 5T chain hoist 91 controls the pole The luffing distance of hanger 5; two luffing wire ropes 7 with a diameter of 12mm are bolted to the upper end of longitudinal steel beam 3 at the end position of picker hanger 5. Pull it to the maximum limit and fix it. When the luffing trolley 4 reaches the disassembly position, use high-strength bolts to clamp an anti-backward slipping device 11 at an angle of 90 degrees behind the luffing trolley 4 to fix the luffing trolley 4;

S4. Fix the first pulley 61 at the upper end of the main hook 1, set the second pulley 62 at the end of the "herringbone"-shaped grilling pole, fix one end of the lifting wire rope 8 on the main hook, and pass the other end through the second pulley respectively. After a pulley 61, the second pulley 62 and the third pulley 63 connected with the suspension hook 631 are fixed on the end of the pole crane 5; the hoisting wire rope 8 is passed through the lower end of the first pulley 61 and then passed through the second pulley 62 Go down to the third pulley 63, and then fix it at the end of the pole crane 5 to form a movable pulley block 6, fasten the lifting wire rope 8 to the first pulley 61 with the lifting arm to be disassembled, and tighten the lifting wire rope 8. The 5T chain hoist 91 passes through the front and rear positions of the second pulley 62 in the air, and reaches the disassembly position;

S5. After disassembling a section of the boom, separate the hook 631 from the boom, pull the pole crane 5 to an angle of 105 degrees, and tighten two luffing wire ropes 7 arranged in parallel on the longitudinal steel beam 3, A 3T chain hoist 92 is hung on the front end of the luffing trolley 4, and the speed at which the air luffing trolley 4 moves backward is controlled by the 3T chain hoist 92. The rear roller position fixes the anti-slip device 11 to change the position of the 3T chain block 92 to ensure that the luffing trolley 4 arrives at the destination normally and safely.

In the present embodiment, the length of the transverse steel girder 2 is 2.5 times longer than the luffing trolley 4 used. The actual height dimension is obtained through calculation, and the height and length of different tower crane models and main poles are different.

In this implementation, an anti-tilt device 22 is welded behind the base 31 of the pole crane, through which the backward tipping phenomenon caused when the pole crane 5 is luffed to the maximum angle can be well prevented.

Combined with a specific operation for further introduction, please refer to Figure 3-Figure 4. In this embodiment, the SCM-C7030 tower crane is used to hoist the 12T roof crane. After a comprehensive inspection of all mechanisms and electrical equipment, to make each system normal, pull the boom, Carry out the action test of each part, and use it after passing the test.

Before the disassembly of the tower crane, use the internal climbing system of the tower crane to lower the tower crane to the lowest position away from the roof, fix the tower crane firmly at the position of the climbing frame, move the roof crane to rotate, use the roof crane boom to lift off the counterweight, and leave a counterweight for balance effect. Install two "herringbone"-shaped pole cranes on the main pole 1 of the second section of the front section of the boom, and use a 5T chain block to control the overturning of the pole cranes to achieve the effect of controlling the center point of the hook 631. Use the hoisting wire rope 8 as the traction power to hoist the last section of the boom to bear the force, then knock off the connecting pin of the boom, and loosen the 5T chain hoist slightly, so that the last section of the boom is in line with the countdown There is a distance between the second section of the boom, and then start the main hoisting mechanism to hoist the boom to the ground. Use this method to remove the penultimate section of the boom and use the roof crane to lift the front end of the 50-meter boom for 15 meters. degree angle, so that the front tie rod is bent, remove the front tie rod of the tower crane with a 6T small roof crane, and then slowly loosen the main hook of the 12T roof crane, lift the boom between 40-50 meters without changing the original lifting point, remove the The boom is directly hoisted to the ground, and then the 40-meter boom is hoisted to the roof at one time with a 12T roof crane, and then it is broken down into 5 meters and 10 meters and then hoisted to the ground.

Install the 50*50*6mm*22000 transverse steel beam 2 on the upper end of the luffing trolley 4, rigidly connect it with the luffing trolley 4 with Φ16*8.8 grade U-bolts, weld the pole hanging base 21 on the front end of the transverse steel beam 2, and place the Φ80 *10*6000mm seamless steel pipe is used to install the pole crane on the pole crane base 21 through pin connection, and the main hook rod 1 with the pressure wheel 31 and the hook wheel 32 is used at the rear of the transverse steel beam 2. In this embodiment, there are two luffing trolleys 4, which are respectively the first luffing trolley 41 and the second luffing trolley 42. end, the two ends of the "herringbone" shaped pole hanger 5 are respectively fixed on the first pole hanger base 211 and the second pole hanger base 212 by pin shafts, the first pole lift base 211 and the second pole hanger base 211 The bases 212 are fixedly connected with steel beams to increase the force and prevent deformation. The first transverse steel beam 2A is fixed on the first luffing trolley 41 through high-strength bolts, and is connected with the first longitudinal steel beam 3A. The transverse steel beam 2B is fixed on the second luffing trolley 42 through high-strength bolts, and is connected with the second longitudinal steel beam 3B, and the lower end of the first longitudinal steel beam 3A is connected and fixed with the lower end of the second longitudinal steel beam 3B to prevent force time deformation.

In this embodiment, use Φ13mm lifting steel wire rope 8 to connect the end of the pole crane 5, pull the pole crane 5 to an angle of 75 degrees and fix the other end of the lifting wire rope 8 on the main pole, Make sure the crane 5 is secure when sliding backwards. In this embodiment, one end of the luffing wire rope 7 is used to connect the end of the pole crane 5, and the other end is respectively fixed on the upper ends of the first longitudinal steel beam 3A and the second longitudinal steel beam 3B, and the front end of the luffing wire rope 7 is connected with a temporary The 3T chain hoist 92 is fixed, the wire rope head is fastened on the luffing trolley 4, slowly slide the luffing trolley 4 one after another to stop 1.5 meters behind the connection point of the next boom, and use the fixed bolts to form an anti-slip device, fix the luffing trolley 4 on the boom, after the luffing trolley 4 and the transverse steel beam 3 are fixed, put on the lifting rope, and slowly loosen the luffing trolley 4 after the center distance is determined. Wire rope, start to remove the boom, in this way, remove several sections of the boom at the front end until the front tie rod position.

In this embodiment, the "herringbone"-shaped pole crane 5 is made of seamless steel pipe with a diameter of 80x12, the material is Q235, the length of a single pole is 8 meters, the left and right span is 1.3 meters when installed, and the maximum lifting weight is 1.3T , Luffing chain hoist luffing.

According to the overturning range of the actual situation, calculate the force on the single limb of the pole. Because the maximum amplitude is the most unfavorable working condition, the calculation is carried out according to the most unfavorable working condition. The weight of the pole itself is very small and the weight of the pole itself is not considered for the convenience of calculation. Double-rate hoisting steel wire rope is selected, the single pulling force is 0.65T, and the force on a single pole is: single limb = 1.26T = 12.6KN

rod strength check

Steel pipe specification (mm) Φ80x12 Sectional area A(mm2) 2563.54 Section radius of gyration i(mm) 24.413 Strength design value [f] (N/mm2) 215

1. Check calculation of axial tensile strength of rod

σ=N/A=12600/2563.54=4.9N/mm2≤[f]=215N/mm2

2. Check calculation of the axial compressive strength of the member

Rod Slenderness Ratio:

λ1=L0/i=(a12+b12)0.5/i=(1200)/24.413=49.15≤[λ]=15, check the specification table and get: 1 = 0.858

Axial compression stability factor:

The above relevant parameters all meet the requirements of general building operation regulations!

In this embodiment, the heaviest part of the tower crane installed is the 40m boom of the tower crane. When the boom is lifted (the boom weighs 8780kg), when the 12T roof crane is at an elevation angle of 75 degrees and the working radius is 9 meters, The rated load is 11400kg, and the lifting height is 25m. Therefore, the 12T roof crane is used to assist the tower crane installation task.

The advantages of the present invention are:

1) The present invention uses a luffing trolley with a pole crane and a moving pulley block to install and disassemble the boom, making full use of its own space and advantages, and can lift the boom away from the tower crane at one time and connect it successfully. The roof layer greatly reduces the impact of the surrounding high-rise buildings on the disassembly of the boom;

2) The installation and disassembly structure is simple, easy to operate and highly feasible;

3) In this implementation, an anti-tilt device is welded behind the base of the pole crane, which can well prevent the backward tipping phenomenon caused by the pole crane luffing to the maximum angle. The structure design is ingenious, safe and reliable.

What is disclosed above is only one of the ways of implementing the present invention, and does not constitute a limitation on the rights of this patent. If those skilled in the art are inspired by it, without departing from the inventive concept of the present invention, they design implementation cases similar to this solution without creativity, which all belong to the protection scope of the present invention.

Claims (10)

1. A device for installing and dismounting a boom, characterized in that it comprises a main beam, a transverse steel girder, a longitudinal steel girder, a luffing trolley, a pole crane, a moving pulley block, a luffing wire rope and a hoisting wire rope. The longitudinal steel beam is vertically fixed on the main beam by means of pressure rollers and hook wheels, the horizontal steel beam is placed horizontally and parallel to the lower end of the main beam, and one end of the horizontal steel beam is fixed to the longitudinal steel beam with screws connection, the other end is provided with a pole crane base, and the pole crane is fixed on the pole crane base, and an anti-tilt device is welded behind the pole crane base, and the horizontal steel beam, the longitudinal steel beam and the main beam The lower ends of the rods together form a semi-enclosed rectangular area, the luffing trolley is fixedly connected with the transverse steel beam through U-shaped bolts, and accommodated in the semi-enclosed rectangular area, the luffing steel wire rope is connected with the chain hoist, and One end is fixed on the pole hanger, and the other end is fixed on the main pole. One end of the lifting wire rope is fixed on the main pole, and the other end passes through the pulley block and is fixed on the pole hanger. 2. The device for installing and dismounting the boom according to claim 1, characterized in that the length of the transverse steel beam is 2.5 times longer than the luffing trolley used. 3. The device for installing and dismounting the boom according to claim 1, characterized in that the moving pulley block includes a first pulley fixed on the upper end of the main pole, which is arranged at the end of the "herringbone"-shaped pick-up pole The second pulley and the third pulley connected with the hook, the first pulley and the second pulley are fixed pulleys, the third pulley is a movable pulley, one end of the lifting wire rope is fixed on the main hook, and the other end After passing through the first pulley, the second pulley and the third pulley in turn, it is fixed on the end of the "herringbone" type grill rod. 4. The device for installing and dismounting the boom according to claim 1, characterized in that two luffing trolleys are arranged on the main pole, which are respectively the first luffing trolley and the second luffing trolley, A first transverse steel beam is fixed on the first luffing trolley, the first transverse steel beam is fixedly connected with the first longitudinal steel beam, a second transverse steel beam is fixed on the second luffing trolley, and the The second transverse steel beam is fixedly connected to the second longitudinal steel beam, and the first luffing trolley and the second luffing trolley move synchronously. 5. The device for installing and dismounting the boom according to claim 4, characterized in that, the two ends of the boom crane are respectively fixed on the first boom crane base and the first transverse steel beam by pin shafts. On the second pole hanging base on the second transverse steel beam. 6. The device for installing and dismounting the boom according to claim 1, characterized in that an anti-slip device is also provided in the semi-enclosed rectangular area, and the anti-slip device is fixed on the main shaft by high-strength bolts lower end of the rod. 7. The device for installing and dismounting the boom according to claim 1, wherein the transverse steel beam and the longitudinal steel beam are made of square or H-shaped steel. 8. A method for installing and dismounting a boom, comprising the following steps: S1. First determine the weight of the front boom according to the model of the tower crane, and the actual height of the main beams on both sides of the luffing trolley of the tower crane. After calculating the relevant parameters, the horizontal steel beam and the longitudinal steel beam are made of square or H-shaped steel. ; S2. Set up the pole crane base at one end of the horizontal steel beam, and connect the longitudinal steel beam vertically with bolts at the other end, and fix the longitudinal steel beam at the lower end of the main pole by means of pressure rollers and hook wheels, and the horizontal steel beam and the main pole The lower ends are parallel, and the transverse steel beam, the longitudinal steel beam and the lower end of the main beam jointly form a semi-closed rectangular area, and the luffing trolley is accommodated in the semi-closed rectangular area, and the luffing trolley and the transverse steel beam pass through The U-shaped bolt is fixed, and the luffing trolley moves back and forth, thereby driving the transverse steel beam to move back and forth under the action of the pressure roller and the hook wheel; S3. Install the pole crane. Use a 5T chain hoist and a luffing wire rope to connect the end of the pole crane and the upper end of the main pole. The distance is not less than 5 meters. The 5T chain hoist is used to control the luffing distance of the pole crane. ; Bolt two luffing steel wire ropes at the end of the pole crane and fasten them to the upper end of the longitudinal steel beam. When moving backward, tighten the luffing steel wire ropes to pull the pole crane to the maximum limit and fix it. When the luffing trolley reaches the disassembly position , at the rear of the luffing trolley, use high-strength bolts to clamp a 90-degree anti-slip device to fix the luffing trolley; S4. Fix the first pulley at the upper end of the main pole, set the second pulley at the end of the "herringbone"-shaped grilling pole, fix one end of the lifting wire rope on the main pole, and pass the other end through the first pulley and the second pulley respectively. After the second pulley and the third pulley connected with the hook, fix it at the end of the pick-up rod crane; pass the lifting wire rope through the lower end of the first pulley and then go down through the second pulley to the third pulley, and then put it on the pick-up bar The end of the crane is fixed to form a movable pulley block, and the lifting arm to be dismantled is fastened to the first pulley with a lifting wire rope, and the lifting wire rope is tightened. The 5T hand chain hoist passes through the front and rear positions of the second pulley in the air and reaches the disassembly position; S5. After dismantling a section of the boom, separate the hook from the boom, pull the pole to an angle of 105 degrees, tighten two luffing steel wire ropes on the longitudinal steel beam, and hang a luffing trolley front end 3T chain hoist, the 3T chain hoist controls the speed of the luffing trolley moving backward in the air. When the chain length of the 3T chain hoist is not enough, fix the anti-slip device at the position of the rear roller of the luffing trolley to change The position of the 3T chain hoist ensures that the luffing trolley reaches the destination normally and safely. 9. The method for installing and dismounting the boom according to claim 8, characterized in that the length of the transverse steel beam is 2.5 times longer than the luffing trolley used. 10. The method for installing and dismounting the boom according to claim 8, characterized in that an anti-dipping device is welded behind the base of the boom crane.