CN110356995B - Construction method for hoisting stator by matching hydraulic lifting device with portal frame - Google Patents
Construction method for hoisting stator by matching hydraulic lifting device with portal frame Download PDFInfo
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- CN110356995B CN110356995B CN201910663436.1A CN201910663436A CN110356995B CN 110356995 B CN110356995 B CN 110356995B CN 201910663436 A CN201910663436 A CN 201910663436A CN 110356995 B CN110356995 B CN 110356995B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
- B66F3/42—Constructional features with self-contained pumps, e.g. actuated by hand
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/43—Pyrotechnical jacks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/46—Combinations of several jacks with means for interrelating lifting or lowering movements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F2700/00—Lifting apparatus
- B66F2700/05—Hydraulic jacks
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Abstract
The invention discloses a construction method for hoisting a stator by matching a hydraulic hoisting device with a portal frame, which comprises the steps of firstly installing hoisting equipment formed by the hydraulic hoisting device and the portal frame, then hoisting and installing the equipment by the installed hoisting equipment, paving a track beam between a stator platform and a hoisting object, installing the portal frame on the track beam, then arranging the hydraulic hoisting device on the portal frame, after the stator is hoisted by the hydraulic hoisting device, walking the portal frame to a stator positioning position along the track beam under the action of a thruster, and then operating the hydraulic hoisting device to drop the stator to complete positioning; the invention realizes the narrow space, the hoisting of the heavier objects in the factory building without large-tonnage hoisting equipment is in place, and the vertical lifting, descending, front-back movement and rotation operation of the heavy objects can be completed.
Description
The technical field is as follows:
the invention relates to the field of power supply and transformation construction, in particular to a construction method for hoisting a stator by matching a hydraulic lifting device with a portal frame.
Background art:
the volume and weight of a generator stator are gradually increased along with the increase of the installed capacity of a thermal power generating unit, the size and weight of the generator stator are over 200t, 300t or 400t, the space of a factory building is low and narrow in the construction process of the in-place of a high-voltage power transmission and transformation station engineering stator, a machine for construction and maintenance only designs a 75t traveling crane, the weight of the stator reaches about 230t, the traveling crane can not meet the hoisting in-place requirement of the stator far, a winch or a hydraulic lifting device is selected to be arranged on the traveling crane to hoist the stator, and the beam of the traveling crane is also difficult to bear; this adds even more difficulty to the installation of the device if the device requires a rotational orientation before it is in place.
In the recent commonly used method, hydraulic lifting devices are arranged on two traveling cranes to hoist stators, but the requirement on the strength of the traveling cranes is higher and higher, a power generation enterprise has to reinforce the girder in strength when customizing the traveling cranes in order to hoist the stators once, the foundation strength of the traveling crane rails is also increased, and the engineering cost is greatly increased.
The invention content is as follows:
the technical problem to be solved by the invention is as follows: the construction method for hoisting the stator by matching the hydraulic lifting device with the portal frame overcomes the defects of the prior art, lays the track beam between the stator platform and the hoisted object, adopts the steel cable type hydraulic lifting device to be matched with the portal frame to walk on the track beam, realizes narrow space, and completes vertical lifting, descending, front-back movement and rotation operation on the heavier object in a factory building without large-tonnage hoisting equipment.
The technical scheme of the invention is as follows: a construction method for hoisting a stator by matching a hydraulic lifting device with a portal frame comprises the following steps of A, construction preparation and foundation treatment: carrying out leveling treatment on the foundation and arranging a road base plate for lining four stand columns for supporting the track beam;
B. the track beam is supported, arranged and reinforced: determining and installing the positions of an upright post for supporting the track beam and a steel buttress for supporting the interface of the track beam;
C. placing a track beam: the track beams are arranged on the steel buttresses in two rows and are fixed through bolts;
D. the portal running gear is put and the portal is installed: determining the position of a traveling wheel and installing, and integrally hoisting or hoisting in sections by a steam crane according to the space of the overhaul room and fixing the gantry on the traveling wheel;
E. installation layout of the hydraulic lifting device: a jack of the hydraulic lifting device is arranged on the portal frame through a steel beam, a hydraulic pump station of the hydraulic lifting device is arranged on a platform of the two end beams, and the hydraulic pump station is connected with the jack through a high-pressure oil pipe and a signal cable;
F. improving and debugging the lifting device: a lifting steel strand penetrates through the jack, and a lower anchor head and a lifting hook are installed on the steel strand;
G. stator unloading and steering: lifting a stator on the transport vehicle and performing auxiliary steering on the stator through two jacks in the middle of the steel beam;
H. the hydraulic lifting device is newly arranged: adjusting the position of the jack on the steel beam and dismantling a 400t lifting hook; I. hoisting the stator in place; J. and (5) dismantling the hoisting equipment.
Further, in the step a, the size of the roadbed is 1.6m × 4.6m × 0.2m, and the roadbed between the overhauls below the roadbed is subjected to concrete pouring treatment after being dug deeply; and leveling the placing position of the steel buttress for supporting the track beam on the stator platform to clear the obstacles.
Further, in the step B, the specific operation steps of the track supporting beam are as follows: a. placing a road base plate on the basis of the treated foundation, and then respectively erecting four upright posts on the road base plate according to positions defined in advance; b. the upright columns are connected with the road base plate through flanges and bolts, and then the adjacent upright columns on the two sides are connected and reinforced by H-shaped steel;
the concrete operation steps of the steel buttress are as follows: a. the stator platform on the lower side of the steel buttress is paved on the uneven position by fine sand with the thickness not more than 1 cm;
b. paving the steel buttress by using a steel plate, so that the height difference of the upper planes of the buttress and the pillar is not more than 5 mm;
c. two adjacent steel buttresses are connected and reinforced by section steel to form a frame structure; the steel buttresses are placed on the stator platform, the size of the steel buttresses is 800mm multiplied by 800mm, and the number of the steel buttresses is the same as that of the interfaces of the track beam.
Step C, the track beam is operated in the concrete steps that a, the track gauge of the track beam is the same as the wheel track of the walking wheels at two sides of the portal frame, the adjacent track beams at the same side are connected by high-strength bolts, and the interface of the track beam is positioned on the steel buttress;
b. measuring the placed track beam, wherein the whole track gauge error is not more than 5mm, the straightness of the steel rail is less than 2%, the height error is not more than 5mm, and the interface gap is not more than 2 mm;
c. plugging the gap between the track beam and the steel buttress by using a thin steel plate, and welding baffle plates for preventing the track beam from moving left and right on two sides of the track beam;
d. and after the portal is combined and hoisted, the track beam above the overhaul room is arranged.
Further, in the step D, the specific operation steps of the traveling wheel are as follows: four sets of travelling wheels are placed at predetermined positions on a track beam, and wind-holding ropes fixed on ground anchors are respectively pulled at two sides of each set of travelling wheels;
the specific operation steps of integral hoisting of the portal frame are as follows: arranging the preassembled gantry on a traveling wheel through a steam crane for fixing, and removing a wind-pulling rope;
the specific operation steps of the gantry split hoisting are as follows: a. the walking wheels are arranged at the edge of the overhaul room and are dead by using inclined iron plugs below the parallel walking wheels;
b. the traveling wheels on the same side are connected through bottom beams, the bottom beams are connected through horizontal cross rods, and wind-catching ropes are detached after the bottom beams and the bottom beams form a square frame;
c. the bottom beam is provided with an upright post and a middle support post, the upper plane of the upright post is connected with the main beams, and the main beams on the two sides are connected by the end beams to form a stable portal frame with a frame structure, and all the beams are connected by high-strength bolts to ensure the tightening torque of the bolts.
Further, in the step E, the hydraulic lifting device is a GYT-200 type cable hydraulic lifting device, two steel beams are provided, the length of each steel beam is 600mm × 600mm, the length of each steel beam is 7.2m, a jack is respectively arranged in the middle and at the end of each steel beam, the distance between the jacks is determined according to the distance measurement of the stator lifting bar, and the steel beams provided with the jacks are arranged at preset positions on the gantry through a steam crane.
Further, in the step F, the specific operation steps are as follows: a. respectively penetrating twenty steel strands into the two middle jacks from bottom to top, and connecting the lower ends of the steel strands with a lower anchor head and a 400t lifting hook;
b. and the hydraulic pump station is connected with a power supply, the hydraulic jacks are synchronized in debugging, whether the pipelines are correctly connected is checked, then the lifting appliance is lifted to leave the ground, and the jacks are lifted up and down to enable each steel strand to be uniformly stressed.
Further, in the step G, the specific operation steps are as follows: a. a hydraulic thruster is arranged on the track and communicated with an oil pipe and a special pump station for pushing the gantry to walk on the track beam;
b. the gantry is pushed to a maintenance room, the stator transport vehicle is poured into the maintenance room to align the geometric centers of the four lifting scales of the stator with the center of a lifting appliance, a 400t lifting hook is a steering lifting hook, a pair of phi 110 multiplied by 12m endless ropes is hung on the steering lifting hook, the four lifting scales of the stator are lifted and lifted slowly, and the plate trailer is driven out after the lower plane of the stator leaves the transport plate trailer;
c. the stator slowly falls back, rotates by 90 degrees according to the in-position direction before falling to the ground and then falls on the ground support cushion; and the stability of four pillars needs to be monitored in real time in the operation process, and the height of the ground support pad exceeds the height of a road base plate below the pillars.
Further, in the step H, the specific operation steps are as follows: a. moving the gantry to a stator platform, removing a lifting appliance, drawing out all steel strands, removing a hydraulic pipeline and a signal control line, arranging two jacks in the middle of a steel beam to the other end of the steel beam, wherein the center distance of the jacks on the same steel beam is the same as the center distance of lifting climbers on two sides of a stator, and the distance center line between the two jacks is the same as the positioning center line of the stator; then dragging the two steel beams to enable the center distance of the two steel beams to be the same as the center distance of the lifting climbers on the same side of the stator;
b. penetrating steel strands into the four jacks, 12 in each jack, and dismantling 400t lifting hooks;
c, penetrating the lower anchor heads into the lower ends of the steel strands, connecting the high-pressure oil pipes and the signal control lines, controlling two jacks by each hydraulic pump station, operating the hydraulic pump stations to lift and descend, lifting the lower anchor heads, enabling each steel strand to be uniformly stressed, and then hanging a non-joint loop rope with the diameter of 90mm multiplied by 1.7m on each lower anchor head.
Further, in the step I, the specific operation steps are as follows: a. moving the portal frame to a maintenance room, dropping a lower anchor head, respectively hanging four rings of ropes on four lifting flaps of the stator, adjusting the position of the portal frame to align each lifting point, and slowly lifting;
b. after the height of the stator exceeds the height of the stator platform, the gantry is pushed by a hydraulic thruster to move to a base plate where the stator is located;
c. and after the stator is in place, operating the hydraulic lifting device to fall back, aligning the hydraulic lifting device to the base bolt hole, falling the stator on the bottom plate, and finishing the hoisting of the stator.
The invention has the beneficial effects that:
1. the track beam is laid between the stator platform and the hoisted object, the steel cable type hydraulic hoisting device is matched with a gantry to walk on the track beam, the narrow space is realized, the heavier objects in a factory building without large-tonnage hoisting equipment are hoisted in place, and the vertical hoisting, descending, front-back movement and rotation operation of the heavy objects can be completed.
2. One set or two sets of hydraulic lifting devices are arranged on a portal frame and are matched with the portal frame for use, the portal frame is arranged on a track beam, then the hydraulic lifting devices are arranged on the portal frame, after a stator is lifted by the hydraulic lifting devices, the portal frame moves to a stator positioning position along the track beam under the action of a thruster, and then the hydraulic lifting devices are operated to drop the stator to complete positioning.
3. The invention has 4 traveling mechanisms at the bottom of the gantry, a square frame structure which is formed by connecting bottom beams, main beams, end beams, connecting rods and the like at the upper part through high-strength bolts, and the traveling mechanism is pushed to travel on the track beam through an additionally arranged thruster so as to realize the transfer and the transportation of hoisted objects, and the height and the width of the gantry can be changed by increasing or shortening the length of each beam and each connecting rod so as to realize various combinations, thereby meeting the hoisting requirements in different places.
4. The invention is suitable for carrying out heavy objects such as the following in a small and short factory building without or without large-tonnage hoisting machinery: the hoisting of the stator and the transformer of the coal-fired unit, the hoisting of the module, the stator and the high and medium pressure cylinder of the gas-fired unit, the phase modulator of the high-voltage transmission substation and the like are in place. The device may also turn the device in the direction if the device requires a turning direction before it is in place.
Description of the drawings:
FIG. 1 is a flow chart of a construction method for hoisting a stator by matching a hydraulic lifting device with a portal frame.
Fig. 2 is a schematic diagram of a construction structure for hoisting a stator by matching a hydraulic lifting device with a portal frame.
Fig. 3 is a schematic structural diagram of two hydraulic lifting devices in steering.
Fig. 4 is a schematic structural diagram of four hydraulic lifting devices during hoisting.
The specific implementation mode is as follows:
example (b): see fig. 1, 2, 3 and 4.
In the figure: 1-portal frame (portal frame), 2-hydraulic lifting device, 3-stator platform, 4-track beam, 5-travelling mechanism, 6-upright post, 7-road base plate, 8-steel beam, 9-hydraulic pump station, 10-platform and 11-steel buttress.
A construction method for hoisting a stator by matching a hydraulic hoisting device with a portal frame comprises the steps of firstly installing hoisting equipment formed by a GYT-200 type cable hydraulic hoisting device and the portal frame, and then hoisting and installing the equipment through the installed hoisting equipment; the hoisting equipment is installed from bottom to top, a track beam is laid between a stator platform and a hoisting object (an overhaul room), a foundation is firstly processed, and the track beam is ensured to be arranged on the solid foundation, because the track beam bears all the weight of the hoisting equipment and the hoisted object, if the track beam is used in an overhead manner, the support of the track beam has enough strength and stability; after the track beam is arranged, a portal frame walking mechanism, a combined portal frame bottom beam, a middle strut and a main beam are arranged on the track beam, and finally a portal frame end beam is arranged; and after the portal assembly is finished, arranging a hydraulic lifting device on the portal, connecting an oil way and a circuit, hoisting in place after debugging is finished, if the equipment needs to rotate in the direction before in place, installing a lifting hook at the lower end of the hydraulic lifting device to turn the equipment, then detaching the lifting hook and formally lifting.
The GYT-200 type steel cable type hydraulic lifting device is a novel and special lifting device which takes hydraulic oil as power to push a piston of a hydraulic cylinder to reciprocate, so that load conversion is carried out between an upper clamping mechanism connected with the upper end of the piston and a lower clamping mechanism connected with the lower end of a cylinder body, and a heavy object is lifted (or lowered), and the steel cable type hydraulic lifting device is called as a steel cable type hydraulic lifting device because a high-strength prestressed steel strand with the structural form of 1 multiplied by 7-phi 15.2 is selected as a bearing part in the clamping mechanism, and the single loading capacity of the steel cable type hydraulic lifting device is 200 t. One set of equipment consists of two identical hydraulic jacks and one hydraulic pump station, wherein the two jacks are controlled by the one hydraulic pump station, are connected through a high-pressure rubber pipe and a signal cable, and can be controlled in a centralized manner and also can be operated independently.
The gantry frame is provided with four traveling mechanisms at the bottom, the upper part of the gantry frame is of a square frame structure formed by connecting bottom beams, main beams, end beams, connecting rods and the like through high-strength bolts, and the traveling mechanisms are pushed to travel on the track beams through an additionally arranged thruster so as to realize the migration and the transportation of hoisted objects. The design bearing capacity of the portal frame is 500t, the height and the width of the portal frame can be changed by increasing or shortening the length of each beam and each connecting rod, various combinations are realized, and the hoisting requirements can be met in different places.
The rail beam is formed by welding H-shaped steel double root phases with the length of 12m, the length of 800 multiplied by 280, the length of d =20mm and the length of t =30mm, the span of the support beam is 3300mm and 4250mm respectively, and the total span is 12000 mm.
The present application will be described in detail with reference to examples.
The construction method for hoisting the 235t generator stator by matching the hydraulic lifting device with the portal frame comprises the following steps of: carrying out leveling treatment on the foundation and arranging a road base plate for lining four stand columns for supporting the track beam;
secondly, supporting, arranging and reinforcing the track beam: determining and installing the positions of an upright post for supporting the track beam and a steel buttress for supporting the interface of the track beam;
thirdly, placing the track beam: the track beams are arranged on the steel buttresses in two rows and are fixed through bolts;
step four, placing a gantry traveling mechanism and installing a gantry: determining the position of a traveling wheel and installing, and integrally hoisting or hoisting in sections by a steam crane according to the space of the overhaul room and fixing the gantry on the traveling wheel;
fifthly, mounting layout of the hydraulic lifting device: a jack of the hydraulic lifting device is arranged on the portal frame through a steel beam, a hydraulic pump station of the hydraulic lifting device is arranged on a platform of the two end beams, and the hydraulic pump station is connected with the jack through a high-pressure oil pipe and a signal cable;
sixthly, improving the lifting device and debugging: a lifting steel strand penetrates through the jack, and a lower anchor head and a lifting hook are installed on the steel strand;
seventh step, stator unloading and steering: lifting a stator on the transport vehicle and performing auxiliary steering on the stator through two jacks in the middle of the steel beam;
eighth step, the hydraulic lifting device is arranged from the new layout: adjusting the position of the jack on the steel beam and dismantling a 400t lifting hook; ninthly, hoisting the stator in place; and tenth, dismantling the hoisting equipment.
Further, the first specific operation steps are as follows: and (4) leveling the foundation, wherein a portal frame serving as a hoisting stator needs to travel on the track beam, so that the foundation of the track beam is supported or the support has enough bearing capacity.
1) The foundation of 4 upright columns for supporting the track beam in the overhaul room is processed, a road base plate of 1.6m multiplied by 4.6m multiplied by 0.2m is arranged below the upright columns, each upright column bears the load of 80t, and the required ground endurance is not less than 11t/m2The static friction coefficient of the foundation and the underframe should be greater than 0.2. If the soil is soft soil or quicksand, the requirements are met by performing cast-in-place concrete treatment after deep excavation.
2) The placing position of the rail beam support on the stator platform is leveled, the obstacle is clear, the uneven position is leveled, the position is the positioning platform of the stator, and the firmness meets the bearing requirement.
Further, the specific operation steps of the second step are as follows: a track beam supporting upright post is arranged in the overhaul room, a road base plate is placed on the basis of a treated foundation, then the four upright posts are erected on the road base plate according to positions defined in advance and connected with bolts through flanges. Then the adjacent upright columns at two sides are connected and reinforced by H-shaped steel, so that the upright columns have certain stability.
The stator platform is used for placing steel buttresses, the size of each buttress is 800mm multiplied by 800mm and used for supporting the track beams, the positions of the buttresses are joints of the two track beams, lines are drawn in advance to determine, the number of the buttresses is determined according to the length and the number of the track beams, the longer the hoisting distance is, the longer the track beam is, and the more the buttresses are needed.
1) The lower surface of the buttress is flat and firm, and the concave-convex uneven parts can be paved by fine sand, but the thickness of the fine sand cannot be more than 1 cm.
2) After the buttresses are placed, the height difference of the upper plane of each buttress and the upper plane of the post in the overhaul room is measured, and if the buttresses are different in height, the height difference of the upper planes of the buttresses and the post is not more than 5 mm.
3) And two adjacent piers are connected and reinforced by section steel to form a frame structure, so that the stability of the frame structure is ensured.
Further, the third step includes the following specific steps: and a track beam is arranged on the steel buttress, the track beam is a box-shaped beam with the thickness of 800mm multiplied by 650mm, the upper plane is paved with tracks, and the length of each track is 10 m. The track beams are arranged in two rows, the track gauge is 6.2m and is the same as the wheel gauges of the travelling wheels on the two sides of the portal frame, and the track gauge is suitable for different hoisting places and different sizes of hoisted objects and can be adjusted. Adjacent track beams on the same side are connected through high-strength bolts, and the joints are located on the steel buttresses, so that the bolts are not subjected to large shearing force when the travelling wheels pass through the joints during hoisting. The same is true for placing the track beam on the support column of the overhaul room.
1) The rail gauge error of the whole measurement process after the rail beam is placed is not more than 5mm, the straightness of the steel rail is less than 2%, the height error is not more than 5mm, and the interface gap is not more than 2 mm.
2) A gap cannot be reserved between the track beam and the buttress, the existing gap needs to be filled with a thin steel plate, and baffles are welded on two sides of the plane track beam on the buttress to prevent the track beam from moving left and right.
3) The door frames or the station truck cranes are combined in the overhaul room, so the track beam above the overhaul room is not placed at first, and the door frames are installed after being combined.
Further, the fourth step includes the following specific operation steps: the walking wheels are arranged on the track beam, the number of the walking wheels is 4, the arrangement position is determined by drawing lines in advance, the walking wheels are single wheels, and in order to prevent the walking wheels from toppling over, two wind-holding ropes are respectively pulled on two sides of each set of walking wheels and are fixed on a stable ground anchor.
If the space of the factory building is large enough, the lifting height of the travelling crane meets the requirement, the gantry can be combined on the ground and integrally lifted and placed on the travelling wheels; if the travelling height is insufficient, the combined portal frame can be hoisted in a maintenance room by about 70t of truck crane.
1) The walking wheels are firstly provided with bottom beams, the bottom beams are connected by horizontal cross bars after being in place to form a square frame, and the wind ropes are pulled on two sides of the walking wheels. Then, the upright posts and the middle support post are installed on the bottom beam, the main beams are connected on the upper planes of the upright posts, and finally the main beams on the two sides are connected by the end beams, so that the portal frame forms a stable frame structure. All the beams are connected by high-strength bolts, so that the tightening torque of the bolts is ensured.
2) When the gantry is combined in a split mode, the travelling wheels are placed close to the edge of the overhaul room as much as possible, so that the operation radius of the truck crane can be reduced as much as possible, and the lower portions of the travelling wheels are plugged by inclined iron to prevent the travelling wheels from moving.
Further, the specific operation steps of the fifth step and the sixth step are as follows: arrange hydraulic lifting device on the portal: the hydraulic lifting jack is firstly placed on a special steel beam with the length of 600mm multiplied by 600mm and 7.2 m. The hydraulic lifting jack totally has 4 lifting jacks, 2 steel beams are arranged, 2 lifting jacks are arranged on each steel beam, 1 lifting jack is arranged in the middle of each steel beam, one lifting jack is arranged at one end of each steel beam, and in order to meet the lifting requirement, the positions of the lifting jacks are determined in advance according to the distance measurement of the stator lifting bar. The jack in the middle of the steel beam is used for unloading and steering the stator, after unloading and steering, the jack in the middle is moved to the other end of the steel beam and matched with the other two jacks to lift the stator in place.
1) After the jacks are arranged on the steel beams on the ground, the two steel beams are respectively placed on different positions on the portal by using a truck crane, and the specific positions are determined by drawing lines in advance.
2) Two hydraulic pump stations are respectively placed on the platforms of the two end beams, the pump stations are connected with the jack by high-pressure oil pipes and signal cables, and the positions of the joints correspond to one another.
3) And (3) penetrating 20 steel strands into the two middle jacks from bottom to top, wherein the number of the steel strands penetrated into each jack is 20, the rated load of each steel strand is 8.5t, each jack can lift the weight of 170t, the weight of 340t is lifted by the two jacks together, and the weight of a 235t lifting appliance for the stator is 5.5t and 240.5t in total, so that the lifting requirement is met.
4) The lower ends of the steel strands are connected with a lower anchor head and a 400t lifting hook, a hydraulic pump station is connected with a power supply, a hydraulic jack is synchronized through debugging, whether a pipeline is correctly connected is checked, then a lifting appliance is lifted away from the ground, and the lifting jacks are lifted up and down to enable each steel strand to be uniformly stressed.
And placing the track beam between overhauls, placing the track beam between overhauls on 4 pillars which are arranged in advance, butting the track beam with the track beam on the platform, connecting the interfaces on the upper planes of the pillars by high-strength bolts, and measuring the track gauge, the straightness and the height difference to be consistent with the requirements of the track beam on the platform.
Further, the specific operation steps in the seventh step are as follows: stator unloading and steering: a hydraulic thruster is arranged on the track and communicated with an oil pipe and a special pump station for pushing the gantry to walk on the track beam.
The gantry is pushed onto a track right above the overhaul room, the stator transport vehicle is poured into the overhaul room, the geometric centers of 4 lifting stirrups of the stator are aligned with the center of a lifting appliance as much as possible, a pair of phi 110 multiplied by 12m endless loop ropes is hung on a 400t lifting hook, the 4 lifting stirrups of the stator are hung and slowly lifted, and after the lower plane of the stator leaves the transport plate trailer, the plate trailer is driven out. The stator slowly falls back, rotates 90 degrees according to the locating direction before falling to the ground, and then falls on the ground to support the pad stably.
1) The stator enters the overhaul room, and the geometric center of the lifting bar and the center of the lifting appliance are ensured to be as one as possible, so that the oblique pulling and the oblique pulling during lifting are avoided, the track beam can only bear vertical pressure, and the stability of the track beam is difficult to ensure due to overlarge lateral tension.
2) All weights are on 4 pillars in the overhaul room during lifting, and a specially-assigned person is dispatched to monitor the stability of the pillars and check whether the foundation changes.
3) The height of the support pad after the stator falls to the ground is higher than that of a road base plate below the support column, so that the stator is prevented from pressing on the road base plate to cause the support column to incline.
Further, the specific operation steps in the eighth step are as follows: hydraulic lifting device rearrangement: 1) moving the gantry to a stator platform, removing a lifting appliance, drawing out all steel strands, removing a hydraulic pipeline and a signal control line, arranging two middle jacks to the other end of a special steel beam, wherein the center distance of the jacks on the same steel beam is the same as the center distance of lifting climbers on two sides of a stator, and the distance center line between the two jacks is the same as the positioning center line of the stator; and then dragging the two steel beams to enable the center distance of the two steel beams to be the same as the center distance of the lifting climbers on the same side of the stator.
2) And (4) penetrating steel strands into the 4 jacks, wherein each jack comprises 12 steel strands, the total number of the steel strands is 48, the hoisting load is 400t, and the stator is 235t, so that the hoisting requirement is met.
3) The lower ends of the steel strands penetrate into lower anchor heads, the steel strands are firmly fixed and connected with a high-pressure oil pipe and a signal control line, each pump station controls 2 jacks, the pump stations are operated to lift and descend, the lower anchor heads are lifted, each steel strand is uniformly stressed, and then each lower anchor head is hung with a non-joint loop rope with the diameter of 90mm multiplied by 1.7 m.
Further, the ninth step includes the following specific steps: hoisting the stator in place: 1) and moving the portal frame to the upper part of the overhaul room again, dropping the lower anchor head, hanging 4 rings of ropes on four lifting flaps of the stator respectively, adjusting the position of the portal frame to align all lifting points, and then slowly lifting.
2) The lifting speed of the lifting stator is 10m/h, and no extra load is generated by impact. After the moving speed exceeds the platform, the door frame is pushed by a thruster to move towards the base plate where the stator is located, and the pushing speed is 8 m/h.
3) And after the stator is in place, operating the hydraulic lifting device to fall back, aligning the hydraulic lifting device to the base bolt hole, falling the stator on the bottom plate, and finishing the hoisting of the stator.
The device is used in a certain 2X 300MW gas power plant in a certain month in a certain year, a 300 ton gas turbine module and a 200 ton stator are hoisted, the module and the stator foundation are only about 2m, so the portal frame uses full-working-condition operation, the track beam is laid on the ground and extends to the outer side of a plant, and the portal frame and the lifting device are arranged on the outer side of the plant, so that the auxiliary machinery is convenient to use. 8 constructors and 8 construction days cooperate with a mechanical 50t crawler crane.
Two sets of 175t high-pressure cylinders and 165t stators are hoisted in a certain gas power plant in a certain month in a certain year, each set of stators and high-pressure cylinders are respectively arranged on the central axis of the 12m platform of the No. 1 machine and the No. 2 machine, and the portal frame is assembled and hoisted for two pieces at one time. According to the characteristics of a field site, two columns of 6 upright columns are arranged on the ground of the end of the stator island and used for supporting a track beam, the upright columns are reinforced and connected to form a frame structure, the stability and the bearing capacity of the frame structure are ensured, a portal frame is pushed above the upright columns, and unloading and hoisting are carried out in the space between the two columns of upright columns. 10 constructors travel for 14 days by cooperating with a machine 75 t.
Two phase modulators are hoisted at a certain 800KV power transmission and transformation station in a certain month in a certain year, the engineering steam turbine plant is narrow, a portal frame cannot be completely combined by a traveling crane, and 70t of truck cranes at a maintenance station are combined with an upper beam and arranged with hydraulic lifting equipment. 4 upright columns of 5m are erected in the overhaul room, and the buttress is placed on the stator island and used for supporting the track beam. The constructor takes 8 people for 12 days. The crane runs by 75t and is provided with a truck crane by 70 t.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (6)
1. A construction method for hoisting a stator by matching a hydraulic lifting device with a portal frame comprises the following steps: a. Construction preparation and foundation treatment: carrying out leveling treatment on the foundation and arranging a road base plate for lining four stand columns for supporting the track beam;
B. the track beam is supported, arranged and reinforced: determining and installing the positions of an upright post for supporting the track beam and a steel buttress for supporting the interface of the track beam;
the specific operation steps of the track supporting beam are as follows: a. placing a road base plate on the basis of the treated foundation, and then respectively erecting four upright posts on the road base plate according to positions defined in advance;
b. the upright columns are connected with the road base plate through flanges and bolts, and then the adjacent upright columns on the two sides are connected and reinforced by H-shaped steel;
the concrete operation steps of the steel buttress are as follows: a. the stator platform on the lower side of the steel buttress is paved on the uneven position by fine sand with the thickness not more than 1 cm;
b. paving the steel buttress by using a steel plate, so that the height difference of the upper planes of the buttress and the pillar is not more than 5 mm;
c. two adjacent steel buttresses are connected and reinforced by section steel to form a frame structure; the steel buttresses are placed on the stator platform, the size of the steel buttresses is 800mm multiplied by 800mm, and the number of the steel buttresses is the same as that of the interfaces of the track beam;
C. placing a track beam: the track beams are arranged on the steel buttresses in two rows and are fixed through bolts;
a, the track gauge of the track beam is the same as the wheel track of the walking wheels at two sides of the portal frame, and the adjacent track beams at the same side are connected by high-strength bolts, and the interface of the track beam is positioned on the steel buttress;
b. measuring the placed track beam, wherein the whole track gauge error is not more than 5mm, the straightness of the steel rail is less than 2%, the height error is not more than 5mm, and the interface gap is not more than 2 mm;
c. plugging the gap between the track beam and the steel buttress by using a thin steel plate, and welding baffle plates for preventing the track beam from moving left and right on two sides of the track beam;
d. after the portal frame is combined and hoisted, arranging a track beam above the overhaul room;
D. the portal running gear is put and the portal is installed: determining the position of a traveling wheel and installing, and integrally hoisting or hoisting in sections by a steam crane according to the space of the overhaul room and fixing the gantry on the traveling wheel;
E. installation layout of the hydraulic lifting device: a jack of the hydraulic lifting device is arranged on the portal frame through a steel beam, a hydraulic pump station of the hydraulic lifting device is arranged on a platform of the two end beams, and the hydraulic pump station is connected with the jack through a high-pressure oil pipe and a signal cable;
F. improving and debugging the lifting device: a lifting steel strand penetrates through the jack, and a lower anchor head and a lifting hook are installed on the steel strand;
G. stator unloading and steering: lifting a stator on the transport vehicle and performing auxiliary steering on the stator through two jacks in the middle of the steel beam;
the specific operation steps are as follows: a. a hydraulic thruster is arranged on the track and communicated with an oil pipe and a special pump station for pushing the gantry to walk on the track beam;
b. the gantry is pushed to a maintenance room, the stator transport vehicle is poured into the maintenance room to align the geometric centers of the four lifting scales of the stator with the center of a lifting appliance, a 400t lifting hook is a steering lifting hook, a pair of phi 110 multiplied by 12m endless ropes is hung on the steering lifting hook, the four lifting scales of the stator are lifted and lifted slowly, and the plate trailer is driven out after the lower plane of the stator leaves the transport plate trailer;
c. the stator slowly falls back, rotates by 90 degrees according to the in-position direction before falling to the ground and then falls on the ground support cushion; the stability of the four supporting columns needs to be monitored in real time in the operation process, and the height of the ground supporting pad exceeds the height of a road base plate below the supporting columns;
H. the hydraulic lifting device is newly arranged: adjusting the position of the jack on the steel beam and dismantling a 400t lifting hook;
the specific operation steps are as follows: a. moving the gantry to a stator platform, removing a lifting appliance, drawing out all steel strands, removing a hydraulic pipeline and a signal control line, arranging two jacks in the middle of a steel beam to the other end of the steel beam, wherein the center distance of the jacks on the same steel beam is the same as the center distance of lifting climbers on two sides of a stator, and the distance center line between the two jacks is the same as the positioning center line of the stator; then dragging the two steel beams to enable the center distance of the two steel beams to be the same as the center distance of the lifting climbers on the same side of the stator;
b. penetrating steel strands into the four jacks, 12 in each jack, and dismantling 400t lifting hooks;
c, penetrating lower anchor heads into the lower ends of the steel strands, connecting a high-pressure oil pipe and a signal control line, controlling two jacks by each hydraulic pump station, operating the hydraulic pump stations to perform lifting and descending actions, lifting the lower anchor heads, enabling each steel strand to be uniformly stressed, and then hanging a non-joint loop rope with the diameter of 90mm multiplied by 1.7m on each lower anchor head;
I. hoisting the stator in place; J. and (5) dismantling the hoisting equipment.
2. The construction method for hoisting the stator by matching the hydraulic lifting device with the portal frame as claimed in claim 1, is characterized in that: in the step A, the size of the roadbed plate is 1.6m multiplied by 4.6m multiplied by 0.2m, and the roadbed between overhauls below the roadbed plate is dug deeply and then is treated by pouring concrete; and leveling the placing position of the steel buttress for supporting the track beam on the stator platform to clear the obstacles.
3. The construction method for hoisting the stator by matching the hydraulic lifting device with the portal frame as claimed in claim 1, is characterized in that: in the step D, the specific operation steps of the travelling wheels are as follows: four sets of travelling wheels are placed at predetermined positions on a track beam, and wind-holding ropes fixed on ground anchors are respectively pulled at two sides of each set of travelling wheels;
the specific operation steps of integral hoisting of the portal frame are as follows: arranging the preassembled gantry on a traveling wheel through a steam crane for fixing, and removing a wind-pulling rope; the specific operation steps of the gantry split hoisting are as follows: a. the walking wheels are arranged at the edge of the overhaul room and are dead by using inclined iron plugs below the parallel walking wheels;
b. the traveling wheels on the same side are connected through bottom beams, the bottom beams are connected through horizontal cross rods, and wind-catching ropes are detached after the bottom beams and the bottom beams form a square frame;
c. the bottom beam is provided with an upright post and a middle support post, the upper plane of the upright post is connected with the main beams, and the main beams on the two sides are connected by the end beams to form a stable portal frame with a frame structure, and all the beams are connected by high-strength bolts to ensure the tightening torque of the bolts.
4. The construction method for hoisting the stator by matching the hydraulic lifting device with the portal frame as claimed in claim 1, is characterized in that: and E, the hydraulic lifting device is a GYT-200 type cable hydraulic lifting device, two steel beams are arranged, the size of each steel beam is 600mm multiplied by 600mm, the length of each steel beam is 7.2m, a jack is arranged in the middle and at the end of each steel beam, the distance between the jacks is determined according to the distance measurement of the stator lifting bar, and the steel beams provided with the jacks are arranged at preset positions on the portal frame through steam cranes.
5. The construction method for hoisting the stator by matching the hydraulic lifting device with the portal frame as claimed in claim 1, is characterized in that: in the step F, the specific operation steps are as follows: a. respectively penetrating twenty steel strands into the two middle jacks from bottom to top, and connecting the lower ends of the steel strands with a lower anchor head and a 400t lifting hook;
b. and the hydraulic pump station is connected with a power supply, the hydraulic jacks are synchronized in debugging, whether the pipelines are correctly connected is checked, then the lifting appliance is lifted to leave the ground, and the jacks are lifted up and down to enable each steel strand to be uniformly stressed.
6. The construction method for hoisting the stator by matching the hydraulic lifting device with the portal frame as claimed in claim 1, is characterized in that: in the step I, the specific operation steps are as follows: a. moving the portal frame to a maintenance room, dropping a lower anchor head, respectively hanging four rings of ropes on four lifting flaps of the stator, adjusting the position of the portal frame to align each lifting point, and slowly lifting;
b. after the height of the stator exceeds the height of the stator platform, the gantry is pushed by a hydraulic thruster to move to a base plate where the stator is located;
c. and after the stator is in place, operating the hydraulic lifting device to fall back, aligning the hydraulic lifting device to the base bolt hole, falling the stator on the bottom plate, and finishing the hoisting of the stator.
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| CN201910663436.1A CN110356995B (en) | 2019-07-22 | 2019-07-22 | Construction method for hoisting stator by matching hydraulic lifting device with portal frame |
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Citations (1)
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| CN103848333A (en) * | 2014-02-24 | 2014-06-11 | 广东力特工程机械有限公司 | Portal hoisting system and application method thereof |
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| JP4221761B2 (en) * | 2005-09-30 | 2009-02-12 | 株式会社日立プラントテクノロジー | Boiler module lifting construction method and lifting device |
| CN101580211B (en) * | 2009-06-23 | 2011-11-30 | 中国电力科学研究院 | Multifunctional combined type lifting framework for installing large scale electrical power unit |
| CN101712444B (en) * | 2009-10-22 | 2012-07-25 | 广东力特工程机械有限公司 | Method for hoisting large-size workpiece in ordinary plant and hydraulic jacking equipment thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103848333A (en) * | 2014-02-24 | 2014-06-11 | 广东力特工程机械有限公司 | Portal hoisting system and application method thereof |
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