CN116281640A - A Retrofitting Method for Extending the Main Girder on the Riverside of a Riverside Container Crane - Google Patents

Abstract

The invention discloses a method for lengthening and reforming a river side girder of a shore container crane, which comprises the following steps: firstly, a bearing rail beam for transverse movement is arranged, then 2 groups of large trolley travelling mechanisms on the river side are lifted off the ground simultaneously, a trolley frame for traction transverse movement is placed, 2 groups of large trolley travelling mechanisms on the land side are lifted off the ground simultaneously, a trolley frame for traction transverse movement is placed, 4 transverse trolley is fixed below the trolley of the quay crane respectively, then the quay crane is pulled to a rear open field by adopting a front crane, the reconstruction work of lengthening 6 meters of the main girder on the river side of the quay container crane is carried out, and after the reconstruction is completed, the quay container crane is pulled to the original crane rail. The construction method can safely finish the construction of the lengthened girder at the river side of the crane, and the front and rear sequence of each step and the additionally arranged auxiliary support and reinforcement in the construction process can ensure the safety in the construction process of the crane and the balance of the crane operation after the construction is finished.

Description

A Retrofitting Method for Extending the Main Girder on the River Side of a Quayside Container Crane

technical field

The invention belongs to the technical field of quayside container cranes, and relates to a method for lengthening and transforming the riverside main girder of the quayside container crane.

Background technique

During the use of the shoreside container crane, if the riverside cannot meet the entire coverage area, it will be costly to purchase new equipment directly. When the existing crane is extended on the riverside, there is no existing technology to guide the extension. In the process, it is particularly important to consider the stability of the entire equipment and the safety of the construction process.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for lengthening and transforming the riverside main girder of the container crane on the quay, so as to solve the technical problems existing in the prior art.

The technical solution adopted by the present invention is: a method for lengthening and transforming the riverside main girder of a shoreside container crane. The rail beam is fixed flat and reliable, and then the two sets of cart traveling mechanisms on the river side are simultaneously lifted up to 100mm from the ground, put into the trolley frame for traction and lateral movement, welded and fixed firmly, and then the two sets of cart traveling mechanisms on the land side are simultaneously Lift it up to 100mm from the ground, put it into the trolley frame for traction and lateral movement, weld and fix it firmly, and fix the 4 traverse trolleys under the trolley of the quay bridge respectively and fix them firmly (one trolley at each corner), and then use the front The quayside bridge is moved about 30 meters to the open space behind by the crane traction, and the main girder of the riverside container crane on the quayside is extended by 6 meters. After the transformation is completed, it is towed to the original crane track.

A method for lengthening and reconstructing the riverside main girder of a quayside container crane, the method includes the following specific steps:

(1) First install eight windproof lugs at the four corners of the two lower beams of the welded shore container crane;

(2) Before jacking up, the four-wheel balance beam and the eight-wheel balance beam of the two sets of cart traveling mechanisms on the river side of the shore container crane are welded and fixed with 20mm thick steel plates;

(3) The four-wheel balance beam jacking poles of the two groups of cart traveling mechanisms on the river side are welded and fixed at the four-wheel balance beam jacking position, and a total of four four-wheel balance beam jacking poles are set on the river side;

(4) Use 8 jacks to boost simultaneously the two groups of cart traveling mechanisms on the river side to lift the four-wheel balance beam fixed in advance under the four-wheel balance beam of the cart traveling mechanism to lift the pole to a height of 100mm from the track;

(5) After jacking up, it must be temporarily fixed with H-shaped steel or I-beam by spot welding, and then use a 3t forklift to remove the passive trolleys of the two groups of carts on the river side;

(6) Use a forklift to arrange the 2 sets of traversing rail beams respectively at the center of the eight-wheel balance beams of the 2 sets of trolley traveling mechanisms on the river side, and set the distance between the centers of the two sets of traversing rail beams at 16 meters;

(7) Use a 3t forklift to install 2 sets of traversing traction trolleys under the eight-wheel balance beam of the cart traveling mechanism on the rail beam; The center of the balance beam is aligned; the distance between the centerlines of the two sets of traversing traction trolleys is 16 meters; the two sets of traversing traction trolleys are welded and fixed firmly to the eight-wheel balance beam of the traveling mechanism of the two carts on the river side;

(8) The 2 groups of cart traveling mechanisms on the land side are also operated according to steps 2, 3, 4, 5, 6 and 7, and the installation of the 2 groups of traversing traction trolleys on the land side is completed;

(9) Before the quayside container crane is towed, the trolley traveling mechanism of the quayside container crane is anchored to the anchor position of the mid-span trolley and anchored firmly; then use 2 sets of traction equipment with a traction force of 5 tons to pull the quayside container crane to move laterally From 30 meters to the open space behind, the traction equipment used is the reach stacker at the user's site. 8 wooden wedges plug the wheels of the traverse traction trolley group;

(10) After the quayside container crane is towed to the open reconstruction site behind, the 4 windproof lugs are welded to the 2 sets of traversing rail beams respectively when not in operation, and are used for fixing the cables of the whole machine during the reconstruction period;

(11) After the quayside container crane is towed to the open reconstruction site behind, the crane must be anchored to the crane with four 3-ton or 5-ton-3-meter hand chain hoists in the direction of 10.5 meters in gauge, using four windproof zipper wire ropes. The windproof lugs at the lower beam and the windproof lugs of the traversing rail beam; use 4 windproof zipper wire ropes and 4 sets of 3-ton or 5-ton-3-meter hand chain hoists to anchor the crane to the lower beam of the crane in the direction of 16 meters On the windproof lugs and the windproof lugs of the laterally moving rail beams (a total of 8 windproof zipper wire ropes and 8 sets of 3-ton or 5-ton-3m hand chain hoists) after the windproof zippers are anchored, carry out the riverside container crane at the rear site The side main girder is lengthened by 6 meters, and at the same time, the channel steel head of the wheel of the mobile platform must be spot-welded with the track of the temporary mobile bearing beam;

(12) Weld and fix the supporting rod between the two main beams at the position of 5745mm from the outermost side of the main beam on the river side;

(13) Use four sets of 2t-3m chain hoists and two sets of 2t-3m chain hoists to hoist the bottom of the main girder on the riverside to reinforce the box girder 1, and the bottom of the main girder to reinforce the box girder 1 and the original main girder. Single-sided groove penetration of the web;

(14) Use four 2-ton chain hoists to hoist the box girder reinforced at the bottom of the mid-span main girder, and weld the bottom reinforced box girder of the mid-span main girder to the original main girder, and make single-sided groove penetration on the webs on both sides;

(15) Use four 2-ton chain hoists to hoist the box girder at the bottom of the main girder on the land side, and weld the box girder at the bottom of the main girder on the land side to the original main girder.

(16) Use two 2-ton chain hoists to hoist the outriggers on the river side for reinforcement, weld the outriggers on the river side to the outriggers on the river side, and weld the webs on both sides with single-sided grooves;

(17) After the reinforcement welding of the outriggers on the river side is completed and the flaw detection is qualified, the U-beam backpack and the outriggers on the river side are connected and welded with the steel plates cut in the factory according to the drawing size of the attached drawing (23) to form a box structure welding together;

(18) Use a 25-ton truck crane to remove the upper beam of the cantilever on the river side, and the weight of the upper beam on the cantilever on the river side is 5.5t. The lifting height of the car is 21m;

(19) Use a 25-ton truck crane to cut off the 3.4m position of the head of the cantilever main beam on the river side, place the cut part on the ground, and paint butt weld with the 6m main beam of the extension section on the ground, and use double-sided welding for the butt joint of the main beam;

(20) After the 3.4-meter-long main beam on the river side and the 6-meter-long main beam of the extension section are butt-welded on the ground and flaw detection is completed, 6 process angle steel L90×56×6-400mm and upper and lower 2 pieces of process angle steel L125×80×7-400mm of the cover plate are welded together;

(21) After the 3.4-meter-long main beam on the river side and the 6-meter-long main beam of the extension section are butt-welded on the ground and flaw detection is completed, and the butt welding of the internal process angle steel of the main beam is completed, the bottom of the main beam on the river side is reinforced with box girder 2, and the bottom of the main beam is reinforced. The second box girder is welded to the original main girder, and the webs on both sides are welded with single-sided grooves;

(22) Install two supporting frames under the main beam and arrange two 10t jacks on each supporting frame to support the main beam;

(23) Use a 25-ton truck crane to cut off the two oblique tie rods on the river side;

(24) Use a 50-ton truck crane to disassemble the connecting beam on the river side of the door frame structure;

(25) Cut off the gusset plate at the oblique tie rod on the river side of the original gantry structure, and replace the gusset plate at the oblique tie rod on the river side of the mast structure;

(26) After the replacement and welding of the front tie rod hinge points of the upper door frame structure on the river side and the completion of flaw detection, a 50-ton truck crane is used to install the river side connecting beam of the upper door frame structure;

(27) Paint and install the upper beam between the two extended 9.4-meter-long main beams and the river-side main beam on the ground, and lay the P50 track of the trolley according to the order of operation. The two 9.4-meter-long main beams are disconnected When painting the inner side, find the appropriate position of the upper and lower cover plates and install two connecting support rods between the two main beams;

(28) Use three 50-ton truck cranes or two 80-ton truck cranes and one 50-ton truck crane (according to the on-site truck crane site and moment parameters) to lift the extended main girder and the upper beam on the river side, which is on the ground The assembled module is hoisted to the original crane cutting position for positioning welding, and the hoisting height of the truck is 22 meters. Main girder butt joint adopts double-sided welding;

(29) After the butt welding and flaw detection of the main girder on the river side are completed, 6 process angle steel L90×56×6-400mm and 2 process angle steel L125×80×7- 400mm welded together;

(30) Use a 50-ton truck crane to install the river-side inclined tie rods. Before welding and positioning the river-side inclined tie rods, check that the height difference between the rails of the same section of the two main girders is not more than 3mm, the upturn of the main girder is 75mm, and the gauge of the trolley is plus or minus 3mm ;

(31) Manufacture and installation of railings on the main beam of the riverside extension section; use a 25t truck crane to remove the technical support between the two main beams;

(32) The supporting rods of the main beam on the river side, the main beam on the river side, the diagonal tie rods on the river side, the portal frame structure, the outriggers on the river side, and the railings are repaired; the scaffolding is removed;

(33) Before the quayside container crane is towed, move the traveling mechanism of the trolley to the anchor position of the mid-span trolley and anchor it firmly, remove the windproof cable, and use 2 sets of equipment with a traction force of 3 tons (using the front crane on the user's site as the crane) Traversing traction equipment), tow the quayside container crane to move 30 meters to the original crane track, and 8 wooden wedges plug the wheels of the traversing traction trolley group to prevent the wheel group from moving left and right. Install the passive trolley of the traveling mechanism of the cart; the used bolts are not allowed to be used again. Check and adjust the wheel line and verticality of the traveling mechanism of the cart. Anchor the windproof zipper of the crane;

(34) Remove the traversing trolley and traversing rail beam;

(35) Use a jack to raise the crane and lower it to the original track of the crane, so that the track and the wheel are in contact;

(36) 12t of concrete counterweight was added to the upper beam on the land side, and 4t more concrete counterweight was poured on the upper beam on the land side of the original crane;

(37) Before filling the concrete counterweight of the land-side outrigger, re-arrange the cables in the land-side outrigger to the line tube; arrange a 14-meter-long Φ110 line tube and a 14-meter-long Φ60 line pipe; one 14-meter-long Φ110 line pipe is arranged in the non-ladder side outrigger on the land side; 70t of concrete counterweight is poured into the two land-side outriggers, and 35t of concrete counterweight is poured into each outrigger ;

(38) Two counterweight boxes are welded at the bottom of the lower beam on the land side, and a total of 17t of concrete counterweight is poured into the two counterweight boxes.

Beneficial effects of the present invention: compared with the prior art, the construction method of the present invention can safely complete the construction of the extended main beam on the river side of the crane, and the order of each step in the construction process and the auxiliary support and reinforcement installed can be Ensure the safety of the crane during the construction process and the balance of the crane operation after the construction is completed.

Description of drawings

Figure 1 is a schematic diagram of the structure of the windproof lugs installed;

Fig. 2 is a structural schematic diagram of a fixed cart balance beam;

Figure 3 is a schematic diagram of the structure of the four-wheel balanced jacking pole installed;

Fig. 4 is a structural schematic diagram of the installation jack;

Fig. 5 is a structural schematic diagram of a welding jack;

Fig. 6 is a schematic diagram of the structure of the laterally moving support rail beam;

Fig. 7 is a structural schematic diagram of installing a traverse trolley;

Fig. 8 is a schematic diagram of the side view structure of the crane after the traversing trolley is installed;

Fig. 9 is a schematic diagram of the front view structure of the crane after installing the traversing trolley;

Fig. 10 is a schematic diagram of the structure of the welded windproof lugs of the laterally moving rail beam;

Fig. 11 is a schematic diagram of the side view structure of the welded windproof lug of the laterally moving support rail beam;

Fig. 12 is a structural schematic diagram of installing a windproof zipper wire rope;

Fig. 13 is a side view structure schematic diagram of installing a windproof zipper wire rope;

Figure 14 is a schematic diagram of the installation and welding structure of the support rod between the two main girders;

Fig. 15 is a schematic diagram of a side view of the box girder reinforced at the bottom of the main girder on the river side;

Fig. 16 is a schematic diagram of an end face structure of the box girder reinforced at the bottom of the river;

Figure 17 is a schematic diagram of the second side view structure of the box girder reinforced at the bottom of the mid-span main girder;

Fig. 18 is a schematic diagram of three side views of the box girder reinforced at the bottom of the main girder on the land side;

Figure 19 is a schematic diagram of the reinforcement structure of the outriggers on the river side;

Fig. 20 is a schematic diagram of the side view structure of the U-shaped beam backpack and the river side outriggers connected and welded into a box by steel plates blanked in the factory;

Fig. 21 is a left view structural diagram of a U-shaped beam backpack and a river side outrigger connected and welded into a box by steel plates cut out in the factory;

Fig. 22 is a structural schematic diagram of removing the upper beam of the cantilever on the river side by the truck crane;

Fig. 23 is a schematic diagram of the cut structure of the main beam on the river side of the original crane;

Figure 24 is a schematic diagram of the butt joint structure of the extension section and the end of the main beam cut;

Fig. 25 is a schematic diagram of the welded structure of the lengthening section and the end of the main girder cut with angle steel;

Figure 26 is a schematic diagram of the structure of the box girder reinforced at the bottom of the extension section;

Fig. 27 is a schematic diagram of the installation structure of the support frame under the main beam;

Fig. 28 is a structural schematic diagram of cutting off two river-side oblique tie rods by the truck crane;

Fig. 29 is a schematic diagram of the structure of the connecting beam on the side of the river when the door frame structure is disassembled by the truck crane;

Figure 30 is a schematic diagram of the structure of the gusset plate at the side of the slanted tie rods on the river side of the new gantry structure;

Fig. 31 is a schematic diagram of the structure of the support rod between the two main girders;

Figure 32 is a schematic diagram of the installation structure of the hoisting extended main beam and the upper beam on the river side to the end of the crane;

Fig. 33 is a schematic diagram of the structure of the inclined tie rod installed on the river side by the truck crane;

Fig. 34 is a schematic diagram of the structure of the diagonal tie rods on the river side.

Detailed ways

The present invention will be further described below in combination with specific embodiments.

Example 1: As shown in Figure 1-34, a method for lengthening and transforming the riverside main girder of the shoreside container crane, aiming at the 6m lengthening of the riverside main beam of the shoreside container crane, the shoreside container crane is installed for lateral movement Move the whole machine to the rear land area for reconstruction and construction. First, use a forklift to install the supporting rails for lateral movement under the trolleys on both sides of the reserved door legs. The beam is fixed flat and reliable, and then the two groups of carts on the river side are running simultaneously and lifted up to 100mm above the ground, put into the trolley frame for traction and lateral movement, welded and fixed firmly, and then the two groups of carts on the land side are running simultaneously and jacked up 100mm above the ground, put into the trolley frame for traction and lateral movement, weld and fix it firmly, and fix the 4 traverse trolleys under the trolley of the quay bridge respectively and fix them firmly (one trolley at each corner), and then use the front crane to traction the horizontal Move the shore bridge about 30 meters to the open space behind. Carry out 6-meter lengthening of the main girder of the riverside container crane on the shore. After the transformation is completed, it will be pulled to the original crane track. The specific working steps are as follows:

Precautions for operation: 1. Before the installation of jacking facilities until there is no traction and lateral movement of the shoreside container crane, the windproof zipper of the crane must be anchored well when it is not working every day. 2. The front and rear of the traversing traction trolley need to plug the wheels with wooden wedges or channel steel heads. 3. Windproof cloth should be installed four weeks before each welding, and the wind at the riverside is strong to prevent wind factors from affecting the quality of the welding seam.

1. First install and weld eight windproof lugs at the four corners of the two lower beams. The windproof lugs are fully welded on both sides. The lugs are used for windproof during renovation. The specific approach is shown in Figure 1.

2. Before jacking up, weld and fix the four-wheel balance beam and the eight-wheel balance beam of the two groups of carts on the river side with 20mm thick steel plates. See attached drawing 2 for details on the partial enlarged view of cart operation. The connecting welds must be firmly welded to ensure that there will be no desoldering and movement.

3. The four-wheel balance beam jacking poles for the two groups of carts running on the river side are welded and fixed on the four-wheel balance beam jacking position. A total of 4 four-wheel balance beams on the river side are used for lifting special poles. For details, see the partial enlarged view of the cart running in accompanying drawing 3.

The shoulder pole beam used for jacking must be welded and fixed firmly, and each connecting weld seam must be welded firmly to ensure that it will not be desoldered and loosened.

4. Use 8 sets of 50-ton jacks for the two groups of carts on the river side to simultaneously lift up the jacking poles fixed in advance under the four-wheel balance beam of the carts to a height of 100mm from the track. For details, see attached drawing 4 for a partial enlarged view of cart operation.

Before jacking up the two groups of carts on the river side at the same time, the trolley must be run to the position where the cantilever on the land side is 6 meters from the center line of the outrigger on the land side. During the jacking period, special personnel must observe the synchronization and stability of the 8 jacks. Make sure that there is no sideways or uneven lifting of the jack.

5. After jacking, it must be temporarily fixed by spot welding with H-shaped steel or I-shaped steel, and then use a 3t forklift to remove the passive trolleys of the two groups of carts on the river side, so as to facilitate the placement and installation of the frame of the horizontal mobile platform. See attached drawing 5 for details on the partial enlarged view of cart operation. A passive trolley weighs 1t. When dismantling, you only need to remove the cover of the hinged shaft to disassemble the trolley. The removed parts are stored in spare tools or parts buckets for easy access during installation.

6. Use a 3t forklift to arrange the 2 sets of traversing rail beams at the center of the eight-wheel balance beams of the 2 sets of carts running on the river side (the basic distance between the crane and the cart is 16 meters). The line distance is also set to 16 meters. For details, see accompanying drawing 6 for a partial enlarged view of cart operation. The unit weight of an 8.3-meter-long traverse supporting rail beam is 2.92t.

7. Use a 3t forklift to install two sets of traversing traction trolleys on the supporting rail beam and under the eight-wheel balance beam. The centers of the 2 sets of traversing traction trolleys are aligned with the centers of the 8-wheel balance beams of the 2 sets of carts running on the river side. The distance between the centerlines of the two sets of traversing traction trolleys is 16 meters. The two sets of traversing traction trolleys need to be welded and fixed firmly with the eight-wheel balance beams of the two sets of carts running on the river side. For details, see accompanying drawing 7 for a partial enlarged view of cart operation. The weight of a group of traverse traction trolleys is: 2.3t.

Precautions for this step: 1. The two sets of traversing traction trolleys are designed with traction lugs. Place and fix the two sets of traversing traction trolleys. Pay attention to the traction direction and arrange the direction of the traction lugs. 2. After the two sets of traversing traction trolleys and carts are running and fixed, use 4 wooden wedges or channel steel head spot welding tops to plug the wheels to prevent the wheels from moving left and right.

8. The operation of the two groups of carts on the land side is also operated according to steps 2, 3, 4, 5, 6, and 7. After the installation is completed, it is shown in Figure 8-9. In the figure, 1 is the traverse trolley, and 2 is the traverse guide.

Precautions for this step: 1. Two groups of carts on the land side are running to jack up at the same time, and a single group of carts is not allowed to run for jacking operations. 2. Before the jack lifts the two groups of carts on the land side at the same time, run the trolley to the position where the cantilever on the river side is 6 meters from the centerline of the outriggers on the river side. 3. Before pulling the traversing shoreside container crane, anchor the windproof zipper of the crane before finishing work every day.

9. Before the quayside container crane is towed, run the trolley to the anchoring position of the mid-span trolley and anchor it firmly. Then use 2 sets of traction equipment with a traction force of 5 tons to tow the shoreside container crane to move 30 meters to the open space behind. The traction equipment used in this project is the reach stacker at the user's site. 8 wooden wedges plug the wheels of the traversing traction trolley group to prevent the wheel group from moving left and right.

Precautions for this step: The 2 sets of traversing rail beams need to be driven into the concrete pavement with 32 sets of sleeve-reinforced expansion bolts (TGQ type) M20 with a length of 200mm, and the ground anchor bolts should be firmly fixed to the traversing rail beams.

10. After the quayside container crane is towed to the open reconstruction site at the rear, the 4 windproof lugs must be welded to the 2 sets of traversing rail beams respectively before leaving work to fix the cables of the whole machine during the reconstruction. For details, see attached drawing 10-11 for the windproof ear diagram.

11. After the quayside container crane is pulled to the open rear reconstruction site, the gauge of the crane must be anchored to the lower beam of the crane with 4 sets of 3-ton or 5-ton-3-meter hand chain hoists. on the windproof lugs at the place and on the windproof lugs of the traversing rail beams. Anchor the crane with a base distance of 16 meters: 4 windproof zipper wire ropes and 4 sets of 3-ton or 5-ton-3-meter chain hoists to anchor the windproof lugs at the lower beam of the crane and the windproof lugs of the laterally moving rail beam. (A total of 8 windproof zipper wire ropes and 8 sets of 3-ton or 5-ton-3m chain hoists) After the windproof zippers are anchored, the main girder on the river side of the shore container crane will be lengthened by 6 meters at the rear site. At the same time, the mobile The wheel of the platform is fixed by spot welding with the channel steel head and the track of the temporary moving rail bearing beam. See Figures 12-13 for details.

Windproof zipper wire rope model and length: Φ20.5 wire rope length 8.5 meters, 4 pieces

Φ20.5 steel wire rope length 13 meters 4 pieces

Chain hoists 3 tons or 5 tons-3m 8 sets

12. Install, weld and fix the supporting rods between the two main beams at a distance of 5745 mm from the outermost side of the main beam on the river side. See Figure 14 for details. Precautions for this step: 1. A windproof cloth should be installed four weeks before each welding to ensure that the quality of the welding seam is not affected by the humid air in the air due to the strong wind at the riverside.

13. Use four sets of 2t-3m chain hoists and two sets of 2t-3m chain hoists to hoist the bottom reinforced box girder 1 of the riverside main girder, and the reinforced box girder 1 at the bottom of the main girder is welded to the original main girder, and Weld penetration on one side of the plate. Flange plate fillet welds are subject to 100% UT flaw detection, which respectively meet the inspection quality requirements of JB/T10559-2006 level 1 and GB/T3323-2005 level Ⅱ inspection; details are shown in attached drawings 15-16. Reinforced box girder 1 at the bottom of the main girder on the river side: the length is 17.3 meters, and the weight is 4.7t/piece.

Windproof cloth should be installed four weeks before each welding to ensure that the quality of the welding seam is prevented from being affected by the humid air in the air due to the strong wind at the riverside.

14. Use four 2-ton chain hoists to hoist the bottom reinforced box girder of the mid-span main girder, weld the bottom reinforced box girder of the mid-span main girder to the original main girder, and make single-sided groove penetration on the webs on both sides. Flange plate fillet welds are subject to 100% UT flaw detection, which meet the quality requirements of JB/T10559-2006 level 1 and GB/T3323-2005 level II inspection quality requirements; see Figure 17 for details. Reinforced box girder at the bottom of the main girder: the length is 8.85 meters, and the weight is: 2.4t/piece.

Windproof cloth should be installed four weeks before each welding to ensure that the quality of the welding seam is prevented from being affected by the humid air in the air due to the strong wind at the riverside.

15. Use four 2-ton chain hoists to hoist the box girder at the bottom of the main girder on the land side, and weld the box girder at the bottom of the main girder on the land side to the original main girder. Flange plate fillet welds are subject to 100% UT flaw detection, which respectively meet the inspection quality requirements of JB/T10559-2006 level 1 and GB/T3323-2005 level Ⅱ inspection; details are shown in Figure 18.

Special attention: Windproof cloth should be installed four weeks before each welding to ensure that the quality of the welding seam is prevented from being affected by the humid air in the air due to the strong wind on the riverside.

16. Use two 2-ton chain hoists to hoist the outriggers on the river side for reinforcement. , the outriggers on the river side are reinforced and welded to the outriggers on the river side, and the webs on both sides are welded with single-sided grooves. The fillet welds of the flange plate are subject to 100% UT flaw detection, which meet the inspection quality requirements of JB/T10559-2006 level 1 and GB/T3323-2005 level Ⅱ inspection respectively; for details, see the reinforcement diagram of the outriggers on the river side shown in Attachment 19.

Windproof cloth should be installed four weeks before each welding to ensure that the quality of the welding seam is prevented from being affected by the humid air in the air due to the strong wind at the riverside.

17. After the reinforcement welding of the outriggers on the river side is completed and the flaw detection is qualified, according to the drawings shown in attached drawings 20-21, the U-beam backpack and the outriggers on the river side are connected and welded together with the steel plates unloaded in the factory to form a box structure and welded together . Single-sided groove penetration. Flange plate fillet welds are subject to 100% UT flaw detection, which meet the quality requirements of JB/T10559-2006 level 1 and GB/T3323-2005 level Ⅱ inspection respectively.

Windproof cloth should be installed four weeks before each welding to ensure that the quality of the welding seam is prevented from being affected by the humid air in the air due to the strong wind at the riverside.

18. Use a 25-ton truck crane to remove the upper beam of the cantilever on the river side. The weight of the cantilever upper beam on the river side is 5.5t. The lifting height of the car is 21m. See Figure 22 for details.

Install high-strength bolts M24×85 grade 10.9 on the upper beam, 60 sets will be shipped according to the delivery list, and the removed ones will be used as installation process bolts.

19. Use a 25-ton truck crane to cut off the 3.4m head of the cantilever main girder on the river side, place it on the ground, and connect it with the 6m main girder of the extension section on the ground. Double-sided welding is used for the main beam butt welding. 100% UT + 10% RT flaw detection shall be carried out on the joints, which meet the quality requirements of JB/T10559-2006 level 1 and GB/T3323-2005 level Ⅱ inspection respectively; see the 6m main extension section shown in attached drawings 23-24 for details. Beam Production Diagram. Single piece: The weight of the 3.4m long main beam is about 2t; the weight of the main beam (3.4m+6m=9.4m long) is 6 tons.

Notes on this step:

1. When the main beam is painted, the horizontal inclination of the upper flange plate is not more than 5mm, and the vertical inclination of the main web is not more than 5mm. The height is not more than 3mm;

2. Use a 1m steel ruler to detect that in the area within H/3 from the upper flange plate, the waviness of the web is not greater than 5mm, and the waviness of the rest of the area is not greater than 9mm;

3. A windproof cloth should be installed four weeks before each welding to ensure that the quality of the welding seam is prevented from being affected by the humid air factor in the air due to the strong wind at the riverside.

20. After the 3.4-meter-long main beam on the river side and the 6-meter-long main beam of the extension section are butt-welded on the ground and flaw detection is completed, 6 technological angle steel L90×56×6-400mm and the upper and lower covers of the internal box girder web at the main beam butt joint Two pieces of craft angle steel L125×80×7-400mm are welded together. See Figure 25 for details.

12 butt joint angle steels L90×56×6-400mm for two main girders to be connected to the web on the ground

There are 4 butt joint angle steel L125×80×7-400mm for the upper and lower cover plates.

21. After the 3.4-meter-long main beam on the river side and the 6-meter-long main beam of the extension section are butt-welded on the ground and flaw detection is completed, and the process angle steel inside the main beam is butt-welded, the bottom of the main beam on the river side is reinforced with box girder 2, and the bottom of the main beam is reinforced with boxes Beam 2 is welded with the original main beam, and the webs on both sides are welded with single-sided grooves. Flange plate fillet welds are subject to 100% UT flaw detection, which respectively meet the quality requirements of JB/T10559-2006 level 1 and GB/T3323-2005 level Ⅱ inspection quality requirements; see attached drawing 26 for details;

Reinforced box girder 2 at the bottom of the main girder on the river side: length 7.975m, unit weight: 2t

Precautions for this step: 1. When the main beam is painted, the horizontal inclination of the upper flange plate is not greater than 5mm, and the vertical inclination of the main web is not greater than 5mm. The two main beams can only be bent outwards, not inwards. , the distortion of the main beam is not greater than 3mm;

2. Use a 1m steel ruler to detect that in the area within H/3 from the upper flange plate, the waviness of the web is not greater than 5mm, and the waviness of the rest of the area is not greater than 9mm;

3. A windproof cloth should be installed four weeks before each welding to ensure that the quality of the welding seam is prevented from being affected by the humid air factor in the air due to the strong wind at the riverside.

22. Install two supporting frames under the main beam and arrange two sets of 10t jacks on each supporting frame to support the main beam. See Figure 27 for details.

Precautions for this step: 1. When lifting the main girder with a 10t jack, only the positions of the ribs of the main girder, the lower cover plates on both sides and the webs can be lifted, and the center of the main girder is not allowed to be lifted (because the inner ribs of the main girder for open-hole type). 2. Windproof cloth should be installed four weeks before each welding, and the wind at the riverside is strong to prevent wind factors from affecting the quality of welding seams.

23. Use a 25-ton truck crane to cut off the two oblique tie rods on the river side. See Figure 28 for details. The single piece weight of the diagonal tie rod on the river side is 2.5t. Lifting height: 26 meters.

The original crane river side inclined rod: single piece weight 2.5t; length: 18.5m

24. Use a 50-ton truck crane to disassemble the connecting beam on the river side of the door frame structure. The weight of the connecting beam on the river side is 4.5t, and the lifting height of the truck is 32m. See Figure 29 for details.

44 sets of high-strength bolts M24×80 grade 10.9 are installed on the connecting cross beam on the river side of the door frame structure

Before dismantling the connecting beam on the river side of the door frame structure, run the trolley to the 4.5m position of the cantilever on the land side and use a chain block or channel steel electric welding to anchor firmly.

25. Cut off the gusset plate at the oblique tie bar on the river side of the original portal frame structure. Replace the gusset plate at the river side diagonal tie rod of the new mast structure. As shown in Figure 30, the fillet weld of the gusset plate of the front tie rod of the riverside mast structure must be inspected by 100%UT+10%RT. within the gantry structure. The gusset plate at the inclined tie rod on the river side of the gantry structure is the main force-bearing part and must be fully welded with the surrounding of the original gantry structure. If conditions permit, the manhole should be repaired after opening the manhole in the original gantry structure. For details, see the replacement diagram of the hinge point of the front tie rod of the river side mast structure in Figure 30.

Precautions for this step: 1. When cutting off the original 20mm gusset plate of the diagonal tie rod on the river side, make sure not to damage the original box girder steel plate connected to the gusset plate. After the gusset plate of the oblique tie rod on the river side is cut off for protection, it needs to be polished and then used for subsequent welding of the lug plate. 2. A windproof cloth should be installed four weeks before each welding to ensure that the quality of the welding seam is prevented from being affected by the humid air in the air due to the strong wind at the riverside.

26. After the replacement and welding of the hinge point of the front tie rod of the upper door frame structure on the river side and the completion of flaw detection, a 50-ton truck crane is used to install the river side connecting beam of the upper door frame structure. New bolts are used for flange butt joint bolts, and old bolts are not allowed to be used. The weight of the connecting beam of the upper door frame on the river side is 4.5t, and the lifting height of the truck is 32m.

44 sets of high-strength bolts, M24×80, grade 10.9, are installed on the connecting beams on the river side of the door frame structure.

The three processes of dismantling the river side connecting beam of the upper door frame structure on the river side, replacing the hinge point of the front tie rod of the welded river side door frame structure, and installing the river side connecting beam of the door frame structure must be carried out continuously.

27. On the ground, paint and install the upper beam between the two extended and connected 9.4-meter-long main beams and the river-side main beam, and lay the P50 track of the trolley according to the operation sequence. The inner side of the two 9.4-meter-long main beams is disconnected When painting, find the proper position of the upper and lower cover plates and add two connecting support rods between the two main girders, as shown in Figure 31. The purpose is to ensure that the two The trolley gauge between the main girders and the overall lifting module after painting and installation (two main girders and the main girder river side connecting girder, two supporting rods between the two main girders are connected to form a rigid body is this module, The advantage of this operation is that the main girders are lengthened, the two main girders are laid with tracks, the levelness, camber, upwarp, side bend, trolley gauge, etc. of the two main girders, all welding, correction, baking, etc. Unfavorable factors such as docking and other work in the air and lengthening two beams in the air and adjusting the levelness, camber, upwarping, side bending of the two main beams, laying small tracks, adjusting the gauge of trolleys, and upper main beams Many unfavorable factors such as the connecting beam on the river side and many other unfavorable factors for aerial work are changed to convenient butt joint assembly, welding, baking, adjustment, measurement and positioning on the ground. When hoisting, two 80-100-ton truck cranes are used (specifically, the torque of the truck crane must be combined) and one 50-ton truck crane. Helping a wind rope and stabilizing effect), in order to facilitate the docking in the air, the main girder of the extended section has been set with a docking guide plate and a pull ear for hanging the chain hoist before leaving the factory (convenient to use when the main girder in the air is jointed) The reason for the modular hoisting on the ground is that: when formulating the overall construction plan, the overall construction concept is considered to ensure safety and scientific application, and the general idea of increasing investment in tooling equipment and appliances is adopted. The safest plan for the crane to move laterally from the shore to the land area for construction. At the same time, because the crane moves to the rear land area, the truck crane has sufficient and convenient station intervals when hoisting each component. Therefore, the lengthened main beam section and the main girder The connecting beams must be assembled on the ground and the upper and lower support pipes between the two main beams must be installed as a whole after being modularized.

The butt mounting bolts of the flange of the upper beam of the cantilever on the river side must use new bolts (the list will be shipped with the goods when shipped), and the old bolts are not allowed to be used.

Notes on this step:

1. Lay the trolley P50 track, remove the trolley track on the original 3.4m main girder, check the size of the joint position of the trolley track on the original main girder, determine the length of the newly laid trolley track, and re-lay the trolley track as a whole (calculated in the factory The required length and leave a margin to ship the whole piece).

2. When the main beam is painted and installed, the horizontal inclination of the upper flange plate is not more than 5mm, and the vertical inclination of the main web is not more than 5mm. The two main beams can only be bent outwards, not inwards. The height is not more than 3mm;

3. Use a 1m steel ruler to detect that in the area within H/3 from the upper flange plate, the waviness of the web is not greater than 5mm, and the waviness of the rest of the area is not greater than 9mm;

4. The height difference between the upper flange plates of the two main girders in the same cross section is not more than 3mm;

5. The gauge distance of the two main girder trolleys is ±3mm.

6. The upper and lower support rods between the two main girders must be welded at the position facing the large rib plate of the main girder.

7. Windproof cloth should be installed four weeks before each welding, the purpose is to prevent the strong wind on the riverside and prevent the humid air from affecting the quality of the welding seam.

8. 60 sets of M24×85 grade 10.9 high-strength bolts installed on the upper beam are delivered with the goods.

28. Use three 50-ton truck cranes or two 80-ton truck cranes and one 50-ton truck crane (according to the on-site truck crane site and moment parameters) to lift the extended main girder and the upper beam on the river side, which is a combination on the ground The painted module is hoisted to the original crane cutting position for positioning welding, and the hoisting height of the truck is 22 meters. The butt joint of the main girder adopts double-sided welding, and the butt weld of the main girder must be subject to 100% UT flaw detection, which respectively meet the quality requirements of JB/T10559-2006 level 1 and GB/T3323-2005 level Ⅱ inspection quality requirements; see attached drawing 32 for details Show.

Two: the main beam (9.4 meters long) has a total weight of 16 tons + the weight of the upper beam on the river side is 5.5t + two technical supports 4t = 25.5t.

Notes for this step: 1. When the main beam is painted, the horizontal inclination of the upper flange plate is not greater than 5mm, the vertical inclination of the main web is not greater than 5mm, and the side bend of the main beam is not greater than 10mm. Outside bending, inward bending is not allowed, and the twist of the main beam is not greater than 3mm;

2. Use a 1m steel ruler to detect that in the area within H/3 from the upper flange plate, the waviness of the web is not greater than 5mm, and the waviness of the rest of the area is not greater than 9mm;

3. The height difference between the upper flange plates of the two main girders in the same cross section is not more than 3mm;

4. The camber of the main beam on the river side is 68mm.

5. The gauge distance of the two main girder trolleys is ±3mm.

6. The supporting rods between the two main girders must be welded at the position of the large rib plate of the main girder.

7. Windproof cloth should be installed four weeks before each welding, the purpose is to prevent the strong wind on the riverside and prevent the humid air from affecting the quality of the welding seam.

29. After the butt welding and flaw detection of the main girder on the river side are completed, 6 technological angle steel L90×56×6-400mm and 2 technological angle steel L125×80×7-400mm for the inner box girder web at the main beam butt joint and 2 technological angle steel L125×80×7-400mm welded together.

There are 12 butt joint angle steel L90×56×6-400mm for two main girders butt joint webs.

There are 4 butt joint angle steel L125×80×7-400mm for the upper and lower cover plates.

30. Use a 50-ton truck crane to install the river side inclined tie rods, as shown in Figure 33. Before welding the inclined tie rods on the river side, check that the height difference between the rails of the same section of the two main girders is not more than 3mm, the upturn of the main girder is 75mm, and the gauge of the trolley is plus or minus 3mm. 100% UT + 10% RT flaw detection is required for the welds of the diagonal tie rods on the river side; for details, see the production drawing of the diagonal tie rods of the front beam on the river side shown in Attachment 34.

The weight of a single river lateral tie rod is 4t, and the lifting height is 25m.

31. Manufacture and installation of railings for the main beam of the river side extension section. Use a 25t truck crane to remove the technical support between the two main girders.

32. The supporting rods of the main girder on the river side, the main girder on the river side, the diagonal tie rods on the river side, the gantry structure, the outriggers on the river side, and the railings are to be repainted. Remove scaffolding.

33. Before towing by the quayside container crane, run the trolley to the anchoring position of the mid-span trolley and anchor it firmly. Remove the windshield. Use 2 sets of equipment with a traction force of 3 tons (use the reach stacker at the user site as the lateral traction equipment of the crane), and pull the shoreside container crane to traverse 30 meters to the original crane track. 8 wooden wedges plug the wheels of the traversing traction trolley group to prevent the wheel group from moving left and right. Install the cart to run the passive trolley. Used bolts are not allowed to be reused. Check and adjust the running wheel line and verticality of the cart. Anchor the crane windproof zipper.

34. Remove the traverse trolley and traverse support rail beam.

35. Use a jack to raise the crane and lower it to the original track of the crane, so that the track and the wheels are in contact.

36. Add 12 tons of concrete counterweight to the upper beam on the land side, and add 4 tons of concrete counterweight to the upper beam on the land side of the original crane, and add 8 tons of concrete counterweight to the upper beam on the land side.

37. Before filling the concrete counterweight of the land-side outrigger, re-arrange the cables in the land-side outrigger to the line pipe.

One 14-meter-long Φ110 wire pipe and one 14-meter-long Φ60 wire pipe are arranged in the side leg of the ladder on the land side;

A 14-meter-long Φ110 line pipe is arranged in the non-ladder side leg of the land side leg;

Add 70t of concrete counterweight to the two outriggers on the land side, and pour 35t of concrete counterweight into each outrigger.

38. Two counterweight boxes are welded at the bottom of the lower beam on the land side, and a total of 17t of concrete counterweight is poured into the two counterweight boxes. The weight of 2 counterweight boxes is 1.82t.

39. Repaint the whole machine, dismantle tooling, clean up the site, etc.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention, therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (2)

1. A method for lengthening and reforming a river side girder of a shore container crane is characterized in that: the method comprises the following steps: firstly, a rail bearing beam for transverse movement is arranged under the trolley at two sides of a reserved and measured portal leg by using a forklift and is fixed and leveled, then a crane travelling mechanism of 2 groups on the river side is lifted up to be 100mm away from the ground, a trolley frame for traction and transverse movement is put into the trolley frame for traction and transverse movement to be welded and fixed, 4 transverse movement trolleys are respectively fixed under the trolleys of a quay crane and are fixed firmly, then the quay crane is pulled to an open place at the rear by adopting a front crane, the reconstruction work of lengthening the girder of the crane side of the quay container crane by a set length is carried out, and after the reconstruction is completed, the quay crane is pulled to the original crane track.

2. The method for lengthening and reforming the river side girder of the shore container crane according to claim 1, which is characterized in that: the method comprises the following specific steps:

(1) Eight windproof pull lugs are added and welded at four corners of 2 lower cross beams of the quayside container crane;

(2) Before jacking, welding, fixing and positioning four-wheel balance beams and eight-wheel balance beams of a 2-group large truck travelling mechanism on the river side of the bank container crane by using steel plates;

(3) Four-wheel balance beam jacking carrying poles of the 2-group large vehicle travelling mechanism on the river side are welded and fixed at the jacking positions of the four-wheel balance beams, and 4 four-wheel balance beam jacking carrying poles are arranged on the river side;

(4) 8 jacks are used for simultaneously boosting and lifting four-wheel balance beams which are arranged and fixed under four-wheel balance beams of the large-wheel travelling mechanism in advance on the river side 2 groups of large-wheel travelling mechanisms to a height of 100mm away from the track;

(5) After jacking, temporarily spot-welding and fixing the crane with H-shaped steel or I-shaped steel, and then removing the driven trolley of the 2-group large trolley travelling mechanism on the river side by using a forklift;

(6) Then, the 2 groups of transverse support rail beams are respectively arranged at the centers of eight wheels of the 2 groups of large-vehicle travelling mechanisms at the river side by using a forklift, and the line distance between the centers of the two groups of transverse support rail beams is set to be 16 meters;

(7) Then a forklift is used for installing 2 groups of traversing traction trolleys below eight balance beams of a cart travelling mechanism on the rail bearing beam; the centers of the 2 groups of transverse moving traction trolleys are aligned with the centers of eight balance beams of the 2 groups of large trolley travelling mechanisms on the river side; the distance between the center lines of the two groups of transverse traction trolleys is 16 meters; the two groups of transverse traction trolleys and eight wheels of the travelling mechanism of the 2 groups of large trolleys on the river side are firmly welded and fixed;

(8) The land side 2 groups of large trolley travelling mechanisms are also operated according to the steps 2, 3, 4, 5, 6 and 7, so that the land side 2 groups of transverse moving traction trolleys are installed;

(9) Before traction of the shore container crane, a trolley travelling mechanism of the shore container crane is moved to a mid-span trolley anchoring position and is firmly anchored; 2 traction devices are used for dragging the shoreside container crane to transversely move 30 meters to a rear open field, and 8 wood wedges plug wheels of the transversely moving traction trolley set;

(10) After the shore container crane is pulled to a rear open reconstruction field, when not in operation, 4 windproof pull lugs are welded on 2 groups of transverse support rail beams respectively, and are used for fixing a complete machine cable during reconstruction;

(11) After the shore container crane is pulled to a rear open reconstruction field, 4 windproof zipper steel wires are adopted in the 10.5 meter direction of the crane track gauge when the crane is not operated, and are anchored on windproof pull lugs at the lower beam of the crane and windproof pull lugs of the transverse bearing rail beam by 4 chain blocks; 4 windproof zipper steel wires and 4 chain blocks are adopted in the direction of 16 meters of a base distance of the crane to anchor the windproof zipper lugs at the lower beam of the crane and the windproof zipper lugs of the transverse moving rail bearing beam, after the windproof zipper steel wires are anchored, the lengthening and setting length reconstruction work of the river side main beam of the quay container crane is carried out on a rear site, and meanwhile, the moving platform wheels are also required to be fixed with the temporary moving rail bearing beam track by using channel steel heads in a spot welding mode;

(12) The support rod between the two girders is fixedly arranged at a set position of the outermost side inward distance of the river side girder;

(13) Hoisting a first main girder bottom reinforcing box girder at the side of the river by using four chain blocks, and welding the first main girder bottom reinforcing box girder with an original main girder;

(14) Hoisting the reinforced box girder at the bottom of the middle main girder by using four chain blocks, and welding the reinforced box girder at the bottom of the middle main girder with the original main girder;

(15) Hoisting the reinforced box girder at the bottom of the land side main girder by using four chain blocks, and welding the reinforced box girder at the bottom of the land side main girder with the original main girder;

(16) Hoisting and reinforcing the river side supporting legs by using two chain blocks, and welding the river side supporting legs with the river side supporting legs;

(17) After the reinforcement welding of the river side supporting legs is finished, the U-shaped Liang Beibao and the river side supporting legs are connected and welded into a box body structure by using a steel plate for blanking in a factory;

(18) Dismantling an upper cross beam of the river side cantilever by adopting an automobile crane;

(19) Cutting off the set position of the head part of the main beam of the river side cantilever by adopting an automobile crane, placing the cut-off part on the ground, and painting and butt-welding the cut-off part and the main beam with the set length of the lengthening section on the ground;

(20) After the butt welding of the long girder with the preset length at the river side and the long girder with the preset length at the lengthening joint is completed, 6 process angle steels of the inner box girder web plate and 2 process angle steels of the upper cover plate and the lower cover plate at the butt joint position of the girders are welded together;

(21) After the ground butt welding of the river side set length long girder and the lengthening section set length long girder is finished and the butt welding of the process angle steel in the girder is finished, welding a second reinforcing box girder at the bottom of the river side girder and a Liang Er reinforcing box at the bottom of the girder with the original girder;

(22) Installing 2 main beam lower support frames, and arranging 2 jack supports on each support frame to support the main beam;

(23) 2 river side oblique pull rods are cut off by adopting an automobile crane;

(24) Adopting an automobile crane to detach a river side connecting beam of a door frame structure;

(25) The node plate at the river side oblique pull rod of the original portal frame structure is cut off, and the node plate at the river side oblique pull rod of the new portal frame structure is replaced;

(26) After the replacement and welding of the front pull rod hinge points of the upper door frame structure on the river side are finished, a 50-ton automobile crane is adopted, and a river side contact beam of the upper door frame structure is installed;

(27) Drawing upper cross beams between two lengthened long main beams and river side main beams on the ground, paving a trolley P50 track according to the operation sequence, and finding proper positions of upper cover plates and lower cover plates to additionally mount two main beams to connect supporting rods when the broken inner sides of the two lengthened long main beams are drawn;

(28) Lifting the lengthened main beam and the river side upper beam by adopting three automobile cranes, namely lifting the modules which are well painted on the ground to the original crane cutting position for positioning welding;

(29) After the butt welding of the river side girder is finished, 6 process angle steels of an inner box girder web plate at the butt joint position of the girder and 2 process angle steels of an upper cover plate and a lower cover plate are welded together;

(30) Adopting an automobile crane, installing a river side oblique pull rod, and checking that the height difference of the rails of the same section of two main beams is not more than 3mm before welding and positioning the river side oblique pull rod, wherein the upward warping degree of the main beams is 75mm, and the track gauge of a trolley is positive and negative 3mm;

(31) Manufacturing and installing a main girder railing of the river side lengthening section; removing a process support between the two main beams by adopting an automobile crane;

(32) The river side main beam support rod, the river side main beam, the river side inclined pull rod, the portal structure, the river side supporting leg and the railing are subjected to paint repairing work; dismantling the scaffold;

(33) Before the shore container crane is towed, a trolley travelling mechanism is anchored to an anchoring position of a midspan trolley and is firmly anchored, a windproof guy cable is dismantled, 2 traction devices are used for towing the shore container crane to transversely move 30 meters onto an original crane track, 8 wood wedges plug wheels of a transversely moving traction trolley set, and a driven trolley of the large trolley travelling mechanism is installed; anchoring the windproof zipper of the crane;

(34) Dismantling the transverse moving trolley and the transverse moving rail bearing beam;

(35) Lifting the crane by using a jack to descend to the original track of the crane, so that the track is contacted with wheels;

(36) Adding a concrete counterweight to the land side upper cross beam;

(37) Before filling the land side landing leg concrete counterweight, re-arranging the cable in the land side landing leg into the spool; 1 phi 110 line pipe with the length of 14 meters and 1 phi 60 line pipe with the length of 14 meters are arranged in the ladder side support leg of the land side support leg; 1 phi 110 spool with the length of 14 meters is arranged in the landing leg of the land side and the landing leg of the non-ladder side; filling concrete balance weights 70t into 2 supporting legs on the land side, wherein each supporting leg is filled with 35t concrete balance weights;

(38) 2 weight boxes are welded at the bottom of the land side lower beam, and 17t of concrete weights are added into the 2 weight boxes.

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