CN112010150A - Method for positioning vertical high-pressure heater of power plant by using groined frame - Google Patents
Method for positioning vertical high-pressure heater of power plant by using groined frame Download PDFInfo
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- CN112010150A CN112010150A CN202010929326.8A CN202010929326A CN112010150A CN 112010150 A CN112010150 A CN 112010150A CN 202010929326 A CN202010929326 A CN 202010929326A CN 112010150 A CN112010150 A CN 112010150A
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- pressure heater
- vertical high
- hoisting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
- B66C1/18—Band-type slings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention discloses a method for positioning a vertical high-pressure heater of a power plant by utilizing a groined frame, which mainly relates to the field of large-scale power station equipment installation; the method comprises the following steps: s1, prefabricating temporary lifting lugs and temporary supports on the vertical high-pressure heater; s2, reserving a hoisting channel on the operation layer platform of the construction site; s3, transporting the vertical high-pressure heater in the horizontal state to the lower side of the hoisting channel by using a transport vehicle; s4, hoisting the vertical high-pressure heater off the transport vehicle by using two traveling cranes, and then driving the transport vehicle off a construction site; s5, rotating the vertical high-pressure heater from a horizontal state to a vertical state by the cooperation of the two traveling cranes; s6, vertically hoisting the vertical high-pressure heater in a vertical state by using a travelling crane, and additionally installing a groined frame at a temporary support of the vertical high-pressure heater; the invention can solve the problem that the step-up can not be crossed over the operation layer platform by the prior art method under the condition of narrow height space, and the step-up is in place.
Description
Technical Field
The invention relates to the field of large-scale power station equipment installation, in particular to a method for positioning a vertical high-pressure heater of a power plant by utilizing a groined frame.
Background
The vertical high-pressure heater is an important facility of a power station, generally, after a manufacturer finishes manufacturing the vertical high-pressure heater, the vertical high-pressure heater is transported to a construction site for installation, and due to the fact that the vertical high-pressure heater is heavy in weight and high in height, installation problems of the vertical high-pressure heater always trouble workers.
The existing technical scheme is that under the premise that a girder of a traveling crane of a steam turbine plant is reinforced to bear the load and can meet the hoisting capacity, in order to enable a vertical high-pressure heater to be hoisted from a hoisting hole and to realize rotating, standing and translating in place, two methods are provided for the existing mature and operable method.
The hoisting method comprises the following steps: a trolley with a large hook meeting the load requirement is temporarily configured on a girder of the traveling crane, a carrying pole beam is hoisted below the large hook, four hoisting points are arranged below the beam, two hoisting points on one side are connected with a steel wire rope expansion piece, a lower lifting lug of the vertical high-pressure heater is hoisted, the other hoisting point is connected with a steel wire rope, and an upper lifting lug of the vertical high-pressure heater is hoisted. After the vertical high-pressure heater is lifted, the length of a steel wire rope of the steel wire rope expansion piece is slowly operated to extend, so that the lower part of the vertical high-pressure heater is inclined downwards until the vertical high-pressure heater rotates to be in an upright state, and the vertical high-pressure heater is lifted by a carrying pole beam to cross the running layer platform and be in place on the equipment foundation.
And (2) hoisting method II: a hydraulic lifting device is arranged on a girder of the travelling crane to serve as main lifting equipment, a travelling crane lifting hook serves as a lifting system of auxiliary lifting equipment, a weight mover and a lifting beam are arranged on a travelling crane track and used for horizontal movement of the vertical high-pressure heater, the hydraulic lifting device is connected with a carrying pole beam, and steel wire ropes of the carrying pole beam lifting hook and the travelling crane lifting hook are respectively connected with upper lifting lugs and lower lifting lugs of the vertical high-pressure heater. After the vertical high-pressure heater is hoisted, the hydraulic hoisting device is started to hoist the hook, the upper half part of the vertical high-pressure heater is hoisted, meanwhile, the crane hook descends slowly, the vertical high-pressure heater rotates and stands vertically slowly until the whole vertical high-pressure heater bears all loads by the hoisting system of the hydraulic hoisting device, the weight shifter is adjusted, the hook is descended, and the vertical high-pressure heater is put in place on the foundation.
At present, the vertical high-pressure heater of a million kilowatt unit of a large power station weighs about 320 tons most, the length is about 15.5 meters, the maximum safety limit height of a crane hook is 31 meters, the minimum distance from the hook to the bottom of a lifting beam is 2.615 meters, the safety distance from the top of the vertical high-pressure heater to the top of the lifting beam is 1.058 meters, the elevation of the high-pressure heater bottom is 31-2.615-1.058-15.5 to 11.827 meters under the maximum lifting height of the crane matched carrying pole beam, the elevation of an operation layer is 17 meters, the high-pressure heater cannot be directly positioned in place by a traditional method, and the following problems exist in the construction process:
1. the prior art can not solve the problem that the vertical high-pressure heater in a narrow space has insufficient in-place height and space;
2. the existing technology has the problems of complex construction process, high investment of precision equipment, long construction period, high cost, strict process requirement, high control difficulty, poor operability and the like.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a method for positioning a vertical high-pressure heater of a power plant by using a groined frame, which can solve the problem that in the condition of narrow height space, a step-up cannot pass over an operation layer platform through the prior art method, and the positioning step-up is difficult.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for positioning a vertical high-pressure heater of a power plant by using a groined frame comprises the following steps:
s1, prefabricating temporary lifting lugs and temporary supports on the vertical high-pressure heater;
s2, reserving a hoisting channel on the operation layer platform of the construction site;
s3, transporting the vertical high-pressure heater in the horizontal state to the lower side of the hoisting channel by using a transport vehicle;
s4, hoisting the vertical high-pressure heater off the transport vehicle by using two traveling cranes, and then driving the transport vehicle off a construction site;
s5, rotating the vertical high-pressure heater from a horizontal state to a vertical state by the cooperation of the two traveling cranes;
s6, vertically hoisting the vertical high-pressure heater in a vertical state by using a travelling crane, and additionally installing a groined frame at a temporary support of the vertical high-pressure heater;
s7, hoisting the groined frame by using two traveling cranes, and moving the vertical high-pressure heater upwards to enable the bottom end of the vertical high-pressure heater to be positioned on the upper side of the operating layer platform;
s8, keeping the height of the vertical high-pressure heater inconvenient, translating the vertical high-pressure heater to the upper side of the installation position of the vertical high-pressure heater by using two travelling cranes, then moving the vertical high-pressure heater downwards to enable the groined frame to be placed on the operation layer platform, and then separating the two travelling cranes from the groined frame;
s9, hoisting the top end of the vertical high-pressure heater by using a travelling crane, moving the vertical high-pressure heater upwards to the # -shaped frame to be separated from the operation layer platform, and then dismantling the # -shaped frame;
and S10, after the vertical high-pressure heater is translated to the proper position by the travelling crane, the vertical high-pressure heater is moved downwards to the mounting position, and the vertical high-pressure heater is positioned.
Preferably, the number of the temporary lifting lugs in the step S1 is 4, two temporary lifting lugs are symmetrically arranged at the top end of the outer wall of the vertical high-pressure heater, and the other two temporary lifting lugs are symmetrically arranged at the bottom end of the outer wall of the vertical high-pressure heater;
the number of the temporary supports in the step S1 is 2, and the two temporary supports are symmetrically arranged in the middle of the outer wall of the vertical high-pressure heater.
Preferably, the temporary lifting lugs in the step S1 are cylindrical, the axial leads of the 4 temporary lifting lugs are parallel, and an anti-drop limiting disc is arranged at one end of each temporary lifting lug, which is far away from the vertical high-pressure heater;
the temporary support in the step S1 is a triangular support with a horizontal bottom surface.
Preferably, a belt pad is laid on the ground on the lower side of the hoisting passage in the step S2.
Preferably, the bottom of the travelling crane in the step S4 is connected with a lifting beam, the bottom of the lifting beam is symmetrically provided with steel hanging strips, and the bottom of the steel hanging strips is provided with arc hanging strips adapted to the temporary lifting lugs.
Preferably, in step S4, the two arc-shaped hanging straps of one of the traveling cranes are respectively fixed to the two temporary hanging lugs at the top end of the vertical high-pressure heater, the two arc-shaped hanging straps of the other traveling crane are respectively fixed to the two temporary hanging lugs at the bottom end of the vertical high-pressure heater, and in step S4, the two traveling cranes are lifted synchronously.
Preferably, in the step S5, the lifting beam of the crane hoisting the bottom end of the vertical high-pressure heater slowly drops the hook, and the crane hoisting the bottom end of the vertical high-pressure heater slowly moves towards the direction of the crane hoisting the top end of the vertical high-pressure heater;
the lifting beam of the crane for hoisting the top end of the vertical high-pressure heater slowly lifts the hook, and meanwhile, the crane for hoisting the top end of the vertical high-pressure heater slowly moves towards the direction of the crane for hoisting the bottom end of the vertical high-pressure heater;
until the vertical high-pressure heater is rotated to a vertical state from a horizontal state, and then the arc-shaped hanging strips on the two temporary lifting eyes at the bottom end of the vertical high-pressure heater are taken down.
Preferably, the groined frame in the step S6 includes two main beams and two secondary beams, the main beams are connected with the secondary beams through screws, both ends of the top of each main beam are provided with lifting appliances, and the middle of the top of each main beam is provided with a connecting flange adapted to the temporary support.
Preferably, the step S6 specifically includes:
s61, hoisting a girder to a hoisting channel on the platform of the running layer by using a truck crane, wherein the length of the girder is greater than the width of the hoisting channel, and the girder is erected at the top of the hoisting channel;
s62, moving the vertical high-pressure heater upwards by using a crane for hoisting the top end of the vertical high-pressure heater to enable the temporary supports to be positioned on the upper side of the main beam in the step S61, and then translating the vertical high-pressure heater to enable one of the temporary supports to be positioned on the top of the main beam;
s63, hoisting two secondary beams and the other main beam to the top of the hoisting channel by using a truck crane, and then connecting the secondary beams with the main beam by screws, so that a temporary support is erected on the main beam, a fixed support of the vertical high-pressure heater is erected on the secondary beams, and the temporary support and a connecting flange are connected by screws;
and S64, taking down the arc-shaped hanging strips on the two temporary hanging lugs at the top end of the vertical high-pressure heater.
Compared with the prior art, the invention has the beneficial effects that:
1. the crane is used as a main hoisting machine, the groined frame is used as a main hoisting tool, the temporary support of the vertical high-pressure heater moves downwards, and the vertical high-pressure heater passes through the operation layer platform after being lifted up, so that the aim of smoothly positioning is fulfilled; the method has the advantages of small investment of large-scale precision equipment, simple construction process, convenient operation, easy control, economy, practicality, short construction period, low cost and obvious advantages in the aspects of technical feasibility, safety, economy and the like;
2. the groined-shaped frame is ingenious in conception, reasonable in design size, simple and practical in structure, and capable of solving the problem of limited high space in the hoisting process of the vertical high-pressure heater in a narrow space to the greatest extent; the groined frame is not only a lifting tool, but also reasonably utilizes the space of a lifting hole, and plays a role of a temporary support frame in the conversion process of lifting the lifting beam and the groined frame;
3. the temporary lifting lug fully considers the requirements of high-rise rotation erection and strength requirements, and the temporary support position solves the problems of equipment gravity center and limited height space to the greatest extent;
4. the construction process is simple, the control difficulty is low, the investment of large-scale precise equipment is small, the field operation is easy, the precise positioning is realized, the operation is simple, the construction period is short, the construction progress is fast, the investment of personnel and machinery is reduced to the maximum extent, and the quality and the safety are controllable.
Drawings
FIG. 1 is a schematic structural view of a vertical high-pressure heater;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic structural view of a well-shaped frame;
FIG. 4 is a schematic structural view of a vertical high-pressure heater in cooperation with a groined frame;
FIG. 5 is a schematic view of the neutral high pressure heater in step S5 from a horizontal state;
fig. 6 is a schematic view of an intermediate state in which the neutral high-pressure heater is rotated from the horizontal state to the vertical state in step S5.
The reference numbers in the drawings: 1. a vertical high pressure heater; 11. temporary lifting lugs; 12. a temporary support; 13. a fixed support; 2. a framework shaped like a Chinese character 'jing'; 21. a main beam; 22. and a secondary beam.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.
As shown in fig. 1 to 6, the invention relates to a method for positioning a vertical high-pressure heater of a power plant by using a groined frame, which comprises the following steps:
s1, prefabricating a temporary lifting lug 11 and a temporary support 12 on the vertical high-pressure heater 1, wherein the temporary lifting lug 11 and the temporary support 12 can be directly installed in a factory or on a construction site, preferably, the temporary lifting lug 11 and the temporary support 12 are directly installed in the factory, and the temporary lifting lug 11 and the temporary support 12 are welded on the outer wall of the vertical high-pressure heater 1;
preferably, the number of the temporary lifting lugs 11 in the step S1 is 4, two of the temporary lifting lugs 11 are symmetrically arranged at the top end of the outer wall of the vertical high-pressure heater 1, and the other two temporary lifting lugs 11 are symmetrically arranged at the bottom end of the outer wall of the vertical high-pressure heater 1, so that the stability and the safety of the vertical high-pressure heater 1 in the process of rotating from the horizontal state to the vertical state can be ensured;
the number of the temporary supports 12 in the step S1 is 2, and the two temporary supports 12 are symmetrically arranged in the middle of the outer wall of the vertical high-pressure heater 1, so that the stability and the safety of the vertical high-pressure heater when moving upwards vertically can be ensured;
further, the temporary lifting lugs 11 in the step S1 are cylindrical in shape, the axial leads of the 4 temporary lifting lugs 11 are parallel, an anti-drop limiting disc is arranged at one end of the temporary lifting lug 11 far away from the vertical high-pressure heater 1, and the outer diameter of the anti-drop limiting disc is larger than that of the temporary lifting lug 11, so that the temporary lifting lugs can be prevented from being separated from the lifting appliance;
the temporary support 12 in the step S1 is a triangular support with a horizontal bottom surface, so that the temporary support can have sufficient strength;
s2, reserving a hoisting channel on the operation layer platform of the construction site, and moving the vertical high-pressure heater 1 to the upper side of the operation layer platform from the hoisting channel;
preferably, the belt pad is laid on the ground on the lower side of the hoisting channel in the step S2, so that the vertical high-pressure heater 1 can be prevented from contacting the ground, the vertical high-pressure heater 1 is prevented from colliding with the ground, and the belt pad plays a role in buffering;
s3, transporting the horizontal vertical high-pressure heater to the lower side of the hoisting channel by using the transport vehicle, and transporting the horizontal vertical high-pressure heater to the lower side of the hoisting channel on a construction site from a manufacturer of the horizontal vertical high-pressure heater by using the transport vehicle, wherein the vertical high-pressure heater is higher in height, so that the transportation of the horizontal vertical high-pressure heater is more convenient and safer;
s4, hoisting the vertical high-pressure heater off the transport vehicle by using two traveling cranes, and then driving the transport vehicle off a construction site;
preferably, the bottom of the travelling crane in the step S4 is connected with a lifting beam, the bottom of the lifting beam is symmetrically provided with steel slings, the bottom of each steel sling is provided with an arc sling adapted to the temporary lifting lug, each temporary lifting lug corresponds to one arc sling, and the lifting stability can be ensured by matching the arc slings with the temporary lifting lugs;
specifically, in the step S4, two arc-shaped hanging strips of one of the traveling cranes are respectively fixed to the two temporary hanging lugs 11 at the top end of the vertical high-pressure heater 1, and two arc-shaped hanging strips of the other traveling crane are respectively fixed to the two temporary hanging lugs 11 at the bottom end of the vertical high-pressure heater, in the step S4, the two traveling cranes are synchronously lifted, and the vertical high-pressure heater in a horizontal state moves upwards in a horizontal state;
s5, rotating the vertical high-pressure heater from a horizontal state to a vertical state by the cooperation of the two traveling cranes;
specifically, in the step S5, the lifting beam of the crane hoisting the bottom end of the vertical high-pressure heater slowly drops off the hook, and the crane hoisting the bottom end of the vertical high-pressure heater slowly moves toward the direction of the crane hoisting the top end of the vertical high-pressure heater, so that the vertical high-pressure heater is changed from a horizontal state to an inclined state;
the lifting beam of the crane for hoisting the top end of the vertical high-pressure heater slowly lifts the hook, and meanwhile, the crane for hoisting the top end of the vertical high-pressure heater slowly moves towards the direction of the crane for hoisting the bottom end of the vertical high-pressure heater;
until the vertical high-pressure heater rotates from a horizontal state to a vertical state, then the arc-shaped hanging strips on the two temporary lifting lugs at the bottom end of the vertical high-pressure heater are taken down;
s6, vertically hoisting the vertical high-pressure heater in the vertical state by using a travelling crane, and additionally installing a groined frame 2 at a temporary support of the vertical high-pressure heater;
preferably, the groined type frame 2 in the step S6 includes two main beams 21 and two secondary beams 22, the main beams 21 are connected with the secondary beams 22 through screws, the screws are high-strength screws, both ends of the top of the main beam 21 are provided with lifting appliances, the middle part of the top of the main beam is provided with a connecting flange adapted to the temporary support, the temporary support 12 is connected with the connecting flange through bolts, and the stability of connection between the groined type frame 2 and the vertical high-pressure heater 1 is ensured;
specifically, the step S6 specifically includes:
s61, hoisting one girder 21 to a hoisting channel on the platform of the running layer by using a truck crane, wherein the length of the girder 21 is greater than the width of the hoisting channel, and the girder 21 is erected at the top of the hoisting channel;
s62, moving the vertical high-pressure heater upwards by using a crane for hoisting the top end of the vertical high-pressure heater 1 to enable the temporary supports 12 to be positioned on the upper side of the main beam 21 in the step S61, and then translating the vertical high-pressure heater 1 to enable one of the temporary supports to be positioned on the top of the main beam 21;
s63, hoisting two secondary beams 22 and the other main beam 21 to the top of the hoisting channel by using a truck crane, and then connecting the secondary beams 22 with the main beam 21 by using screws, so that the temporary support 12 is erected on the main beam 21, the fixed support 13 of the vertical high-pressure heater 1 is erected on the secondary beams, and the temporary support and the connecting flange are connected by using screws;
and S64, taking down the arc-shaped hanging strips on the two temporary hanging lugs at the top end of the vertical high-pressure heater.
S7, hoisting the groined frame by using two traveling cranes, and moving the vertical high-pressure heater upwards to enable the bottom end of the vertical high-pressure heater to be positioned on the upper side of the operating layer platform;
s8, keeping the height of the vertical high-pressure heater inconvenient, translating the vertical high-pressure heater to the upper side of the installation position of the vertical high-pressure heater by using two travelling cranes, then moving the vertical high-pressure heater downwards to enable the groined frame to be placed on the operation layer platform, and then separating the two travelling cranes from the groined frame;
s9, hoisting the top end of the vertical high-pressure heater by using a travelling crane, moving the vertical high-pressure heater upwards to the # -shaped frame to be separated from the operation layer platform, and then dismantling the # -shaped frame;
and S10, after the vertical high-pressure heater is translated to the proper position by the travelling crane, the vertical high-pressure heater is moved downwards to the mounting position, and the vertical high-pressure heater is positioned.
A travelling crane is used as a main hoisting machine, a groined frame is used as a main hoisting tool, a temporary support of the vertical high-pressure heater moves downwards, and the vertical high-pressure heater passes through the operation layer platform after being lifted up to achieve the purpose of smooth positioning; the method has the advantages of small investment of large-scale precision equipment, simple construction process, convenient operation, easy control, economy, practicality, short construction period, low cost and obvious advantages in the aspects of technical feasibility, safety, economy and the like; the groined-shaped frame is ingenious in conception, reasonable in design size, simple and practical in structure, and capable of solving the problem of limited high space in the hoisting process of the vertical high-pressure heater in a narrow space to the greatest extent; the groined frame is not only a lifting tool, but also reasonably utilizes the space of a lifting hole, and plays a role of a temporary support frame in the conversion process of lifting the lifting beam and the groined frame; the temporary lifting lug fully considers the requirements of high-rise rotation erection and strength requirements, and the temporary support position solves the problems of equipment gravity center and limited height space to the greatest extent;
the construction process is simple, the control difficulty is low, the investment of large-scale precise equipment is small, the field operation is easy, the precise positioning is realized, the operation is simple, the construction period is short, the construction progress is fast, the investment of personnel and machinery is reduced to the maximum extent, and the quality and the safety are controllable.
Example (b):
crane and frock:
two traveling cranes are arranged in a steam turbine room, one 225T trolley and one 130T trolley are arranged on the traveling cranes, and the special tool comprises a groined frame and two sets of carrying pole beams.
The lifting lug is arranged:
each vertical high-pressure heater manufacturer arranges 4 temporary lifting lugs 11 and 2 temporary supports 12 on the vertical high-pressure heater. (the temporary lifting lug 11 is used for rotating and standing up the vertical high-pressure heater 1; the temporary support 12 is used for supporting and connecting the # -shaped frame 2 and the vertical high-pressure heater 1.)
The vertical high-pressure heater rotates and stands up:
the temporary lifting lugs 11 on the upper portion of the vertical high-pressure heater are hoisted by using a 225T lifting hook matched with a hoisting beam, the temporary lifting lugs 11 on the lower portion of the vertical high-pressure heater are hoisted by using a 130T lifting hook matched with the hoisting beam, the four lifting hooks are hoisted simultaneously, after the vertical high-pressure heater reaches a certain height, the four lifting hooks are stopped, the two 130T lifting hooks are hooked and run towards a 225T trolley direction, and the 225T lifting hook is slowly operated to ascend until the vertical high-pressure heater is rotated completely and erected.
Hoisting a vertical high-pressure heater:
in order to meet the requirement of a vertical high-pressure heater on the hoisting height space, a special hoisting tool is manufactured, a # -shaped frame is designed for the # -shaped frame, the center-to-center distance between two main beams is 4.6m, the secondary beam distance is 7.112m, the length of the main beam is 13.1m, the distance between main beam pin shafts is 12.5m, and the height of the # -shaped frame is 1.76m, four lifting hooks of two traveling vehicles are connected with the pin shafts of the # -shaped frame through pulling plates, the four lifting hooks of the traveling vehicles are started, the top of the vertical high-pressure heater is lifted to the middle position of the two traveling vehicles by.
The specific implementation scheme is as follows: after the vertical high-pressure heater is lifted up, a truck crane is used, and a groined frame for hoisting is arranged at the position of 17m layers (operation layer platforms) of the hoisting hole. The main beams (2) of the groined frame are arranged in parallel to the moving direction of the travelling crane, and the secondary beams (2) are connected with the main beams. Firstly, a main beam is placed at the top of a hanging hole (a hanging channel) of a 17m layer (an operation layer platform), then a travelling crane 225T lifting hook is used for enabling a vertical high-pressure heater which is rotated and erected to lean against a # -shaped frame, a truck crane is used for hanging the other main beam to an installation position, then a secondary beam is connected with the main beam, and the # -shaped frame and a high-pressure temporary support flange are connected and fastened through high-strength bolts. After the combination of the # -shaped frames is completed, the two 225T lifting hooks fall and are unhooked, and the high weight is completely transferred to the # -shaped frames.
And (3) hoisting four hoisting points of the # -shaped frame by using 225T hoisting hooks and 130T hoisting hooks (4 hoisting points in total), lifting the bottom of the vertical high-pressure heater to be above a 17m running layer (running layer platform), and reserving a safety distance of 0.5 m. At the moment, the top of the vertical high-pressure heater is lifted to the middle position of the two main beams of the travelling crane. Height of the top of the vertical high-pressure heater: 17+0.5+15.5 equals 33m, the lower chord height of the roof truss is 36m, and the clear space 36-33 equals 3m, thereby meeting the hoisting requirement. And slowly moving the travelling crane to place the vertical high-pressure heater to the installation position.
Claims (9)
1. A method for positioning a vertical high-pressure heater of a power plant by using a groined frame is characterized by comprising the following steps of:
s1, prefabricating temporary lifting lugs and temporary supports on the vertical high-pressure heater;
s2, reserving a hoisting channel on the operation layer platform of the construction site;
s3, transporting the vertical high-pressure heater in the horizontal state to the lower side of the hoisting channel by using a transport vehicle;
s4, hoisting the vertical high-pressure heater off the transport vehicle by using two traveling cranes, and then driving the transport vehicle off a construction site;
s5, rotating the vertical high-pressure heater from a horizontal state to a vertical state by the cooperation of the two traveling cranes;
s6, vertically hoisting the vertical high-pressure heater in a vertical state by using a travelling crane, and additionally installing a groined frame at a temporary support of the vertical high-pressure heater;
s7, hoisting the groined frame by using two traveling cranes, and moving the vertical high-pressure heater upwards to enable the bottom end of the vertical high-pressure heater to be positioned on the upper side of the operating layer platform;
s8, keeping the height of the vertical high-pressure heater inconvenient, translating the vertical high-pressure heater to the upper side of the installation position of the vertical high-pressure heater by using two travelling cranes, then moving the vertical high-pressure heater downwards to enable the groined frame to be placed on the operation layer platform, and then separating the two travelling cranes from the groined frame;
s9, hoisting the top end of the vertical high-pressure heater by using a travelling crane, moving the vertical high-pressure heater upwards to the # -shaped frame to be separated from the operation layer platform, and then dismantling the # -shaped frame;
and S10, after the vertical high-pressure heater is translated to the proper position by the travelling crane, the vertical high-pressure heater is moved downwards to the mounting position, and the vertical high-pressure heater is positioned.
2. The method for positioning a vertical high-pressure heater of a power plant with a groined frame according to claim 1, wherein the method comprises the following steps: the number of the temporary lifting lugs in the step S1 is 4, wherein two temporary lifting lugs are symmetrically arranged at the top end of the outer wall of the vertical high-pressure heater, and the other two temporary lifting lugs are symmetrically arranged at the bottom end of the outer wall of the vertical high-pressure heater;
the number of the temporary supports in the step S1 is 2, and the two temporary supports are symmetrically arranged in the middle of the outer wall of the vertical high-pressure heater.
3. The method for positioning a vertical high-pressure heater of a power plant with a groined frame according to claim 1, wherein the method comprises the following steps: the temporary lifting lugs in the step S1 are cylindrical in shape, the axial leads of the 4 temporary lifting lugs are parallel, and an anti-falling limiting disc is arranged at one end of each temporary lifting lug, which is far away from the vertical high-pressure heater;
the temporary support in the step S1 is a triangular support with a horizontal bottom surface.
4. The method for positioning a vertical high-pressure heater of a power plant with a groined frame according to claim 1, wherein the method comprises the following steps: and a belt pad is paved on the ground on the lower side of the hoisting channel in the step S2.
5. The method for positioning a vertical high-pressure heater of a power plant with a groined frame as claimed in claim 2, wherein: and the bottom of the travelling crane in the step S4 is connected with a lifting beam, steel hanging strips are symmetrically arranged at the bottom of the lifting beam, and arc-shaped hanging strips matched with the temporary lifting lugs are arranged at the bottom of the steel hanging strips.
6. The method for positioning a vertical high-pressure heater of a power plant with a groined frame according to claim 1, wherein the method comprises the following steps: in step S4, the two arc-shaped slings of one of the traveling cranes are respectively fixed to the two temporary lifting lugs at the top end of the vertical high-pressure heater, the two arc-shaped slings of the other traveling crane are respectively fixed to the two temporary lifting lugs at the bottom end of the vertical high-pressure heater, and in step S4, the two traveling cranes are lifted synchronously.
7. The method for positioning a vertical high-pressure heater of a power plant with a groined frame as claimed in claim 6, wherein: in the step S5, the lifting beam of the crane hoisting the bottom end of the vertical high-pressure heater slowly drops the hook, and the crane hoisting the bottom end of the vertical high-pressure heater slowly moves towards the direction of the crane hoisting the top end of the vertical high-pressure heater;
the lifting beam of the crane for hoisting the top end of the vertical high-pressure heater slowly lifts the hook, and meanwhile, the crane for hoisting the top end of the vertical high-pressure heater slowly moves towards the direction of the crane for hoisting the bottom end of the vertical high-pressure heater;
until the vertical high-pressure heater is rotated to a vertical state from a horizontal state, and then the arc-shaped hanging strips on the two temporary lifting eyes at the bottom end of the vertical high-pressure heater are taken down.
8. The method for positioning the vertical high-pressure heater in the power plant according to claim 7, wherein the groined frame in the step S6 comprises two main beams and two secondary beams, the main beams are connected with the secondary beams through screws, the two ends of the top of each main beam are provided with lifting appliances, and the middle of the top of each main beam is provided with a connecting flange adapted to the temporary support.
9. The method for positioning a vertical high-pressure heater of a power plant with a groined frame as claimed in claim 8, wherein the step S6 specifically comprises:
s61, hoisting a girder to a hoisting channel on the platform of the running layer by using a truck crane, wherein the length of the girder is greater than the width of the hoisting channel, and the girder is erected at the top of the hoisting channel;
s62, moving the vertical high-pressure heater upwards by using a crane for hoisting the top end of the vertical high-pressure heater to enable the temporary supports to be positioned on the upper side of the main beam in the step S61, and then translating the vertical high-pressure heater to enable one of the temporary supports to be positioned on the top of the main beam;
s63, hoisting two secondary beams and the other main beam to the top of the hoisting channel by using a truck crane, and then connecting the secondary beams with the main beam by screws, so that a temporary support is erected on the main beam, a fixed support of the vertical high-pressure heater is erected on the secondary beams, and the temporary support and a connecting flange are connected by screws;
and S64, taking down the arc-shaped hanging strips on the two temporary hanging lugs at the top end of the vertical high-pressure heater.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112875508A (en) * | 2020-12-30 | 2021-06-01 | 山东海湾吊装工程股份有限公司 | Method for hoisting vertical equipment with conical section in frame |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002147023A (en) * | 2000-11-13 | 2002-05-22 | Shimizu Corp | Installing structure of telpher |
| CN111532980A (en) * | 2020-04-03 | 2020-08-14 | 中国能源建设集团安徽电力建设第一工程有限公司 | Vertical high-pressure heater hoisting method |
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2020
- 2020-09-07 CN CN202010929326.8A patent/CN112010150B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002147023A (en) * | 2000-11-13 | 2002-05-22 | Shimizu Corp | Installing structure of telpher |
| CN111532980A (en) * | 2020-04-03 | 2020-08-14 | 中国能源建设集团安徽电力建设第一工程有限公司 | Vertical high-pressure heater hoisting method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112875508A (en) * | 2020-12-30 | 2021-06-01 | 山东海湾吊装工程股份有限公司 | Method for hoisting vertical equipment with conical section in frame |
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