CN116332049A - Boiler drum hoisting method with special structure - Google Patents
Boiler drum hoisting method with special structure Download PDFInfo
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- CN116332049A CN116332049A CN202310545198.0A CN202310545198A CN116332049A CN 116332049 A CN116332049 A CN 116332049A CN 202310545198 A CN202310545198 A CN 202310545198A CN 116332049 A CN116332049 A CN 116332049A
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- 238000002360 preparation method Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
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Classifications
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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
- B66C17/00—Overhead travelling cranes comprising one or more substantially horizontal girders the ends of which are directly supported by wheels or rollers running on tracks carried by spaced supports
- B66C17/06—Overhead travelling cranes comprising one or more substantially horizontal girders the ends of which are directly supported by wheels or rollers running on tracks carried by spaced supports specially adapted for particular purposes, e.g. in foundries, forges; combined with auxiliary apparatus serving particular purposes
- B66C17/10—Overhead travelling cranes comprising one or more substantially horizontal girders the ends of which are directly supported by wheels or rollers running on tracks carried by spaced supports specially adapted for particular purposes, e.g. in foundries, forges; combined with auxiliary apparatus serving particular purposes for transporting ladles
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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
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/26—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
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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
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
Abstract
The invention provides a boiler drum hoisting method with a special structure, which belongs to the technical field of boiler drum hoisting and comprises the following steps: firstly, installing a hoisting temporary support frame, a drum sliding platform, a vertical hoisting pulley and a lateral traction hoisting pulley; transporting the steam drum to a hoisting area, unloading the steam drum through a tower crane and a hoisting pulley in the vertical direction, testing hoisting after scribing, horizontally and vertically stably hoisting the steam drum after checking that each stressed part has no abnormal condition, and stopping hoisting after the bottom surface of a front end support of the steam drum reaches +64.340 elevation; placing the front end support of the steam drum on a cantilever slideway outside the boiler; removing a lifting point of the lifting pulley in the vertical direction, and laterally pulling the lifting pulley to pull the steam drum into the boiler through the steam drum sliding platform; when the rear end support of the steam drum is placed on the cantilever slideway outside the boiler, the lifting point of the tower crane is removed, the hoisting pulley is pulled laterally to pull the steam drum to the position of the steam drum, and the three groups of U-shaped suspenders are installed to remove the steam drum sliding platform and the hoisting machine tool, so that the hoisting of the steam drum is completed.
Description
Technical Field
The invention relates to the technical field of boiler drum hoisting, in particular to a boiler drum hoisting method with a special structure.
Background
The steam drum is also called a drum, is the most important compression element in a natural circulation boiler, is also one of the components with the largest weight and appearance size of the boiler, and is mainly used in a medium-pressure high-pressure subcritical boiler in power production. The connecting hub has the functions of connecting the three processes of heating, evaporating and overheating of working media, and ensuring the normal water circulation of the boiler; the steam-water separation device and the continuous sewage discharging device are arranged in the boiler, so that the steam quality of the boiler is ensured; a certain amount of water is contained, and the device has certain heat storage capacity and can alleviate the change speed of the steam pressure; the steam bag is provided with a pressure gauge, a water level gauge, an accident water discharge, a safety valve and other devices, so that the safe operation of the boiler is ensured.
The large-scale boiler drum is transversely arranged below the plate girder structure at the top of the furnace, and is usually hoisted by two pulley sets or hydraulic hoisting devices. And 4500tds/D alkaliThe boiler, the steam drum is rolled by SA-302GrB steel plate, and the specification is
The lifting weight of the steam drum is 100T. The steam drum is positioned above the rear of the furnace, the center of the steam drum is 1800mm away from the center line of the 9-axis, three groups of U-shaped suspenders are hung below the steam drum suspending beams, the center elevation is 65350mm, the steam drum is bilaterally symmetrical to the center line of the boiler, and the left (right) most edge is about 1557mm away from the center of the main column B, E. Because the boiler structure is special, the steam drum is transversely arranged after being centered and deviated, and 3 groups of U-shaped suspenders with circular cross sections are hung below the steam drum hanging beams, the boiler can not be lifted like a conventional boiler by lifting pulleys or hydraulic lifting devices in the boiler, the conventional lifting machinery in a construction site can not meet the construction requirement, and the cost generated by additionally renting large-scale lifting machinery can far exceed the target cost. It is therefore desirable to provide a method of lifting a boiler drum of a particular construction.
Disclosure of Invention
The invention aims to provide a boiler drum hoisting method with a special structure, which solves the technical problems that the conventional hoisting machinery in the existing construction site cannot meet the drum hoisting requirement and the cost of separately renting the hoisting machinery is high. The invention uses the hoisting machine tool and the material with limited field according to local conditions to smoothly hoist the steam drum in place, thereby creating better economic benefit, reducing hoisting cost and playing a reference role in the similar hoisting construction in the future.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a boiler drum hoisting method with a special structure comprises the following steps:
(1) And (3) hoisting preparation: firstly, installing a temporary support frame and a drum sliding platform, installing a vertical lifting pulley on the temporary support frame, and installing a lateral traction lifting pulley on a steel structure and the sliding platform below the position of the drum;
(2) And (3) carrying a steam drum: firstly, using a drum transportation plate vehicle to enable a drum to enter a hoisting area from a construction road on the right side of a boiler, then unloading a tower crane for installing the boiler and a hoisting pulley in the vertical direction, and preparing test hoisting after finishing works such as scribing;
(3) Steam drum test hanging: firstly starting a vertical lifting pulley and a tower crane, lifting a steam drum off the ground, checking whether abnormal conditions exist at each stressed part of the tower crane, the vertical lifting pulley and the temporary lifting support frame, and performing formal lifting work after all abnormal conditions are eliminated;
(4) And (3) vertically lifting the steam drum: firstly, installing a front end support and a rear end support below a steam drum, then starting a vertical lifting pulley and a tower crane, lifting the steam drum horizontally, vertically and stably, closely monitoring the levelness of the steam drum in the lifting process, keeping the steam drum level as much as possible in the lifting process, ensuring the load rate of each lifting device to be within an allowable range, and stopping lifting until the bottom surface of the front end support of the steam drum reaches +64.340 elevation;
(5) The drum descends: firstly, installing an external cantilever slideway of a boiler at one side of the boiler, then starting a vertical lifting pulley and a tower crane, and slowly placing a front end support of a steam drum on the external cantilever slideway of the boiler;
(6) The drum slides transversely: firstly dismantling a lifting point of a lifting pulley in the vertical direction, then fixedly connecting a lateral traction lifting pulley with a steam drum, then starting the lateral traction lifting pulley and a tower crane, and slowly pulling the steam drum into a boiler on a guide rail on a steam drum sliding platform;
(7) The steam drum is in place: when the rear end support of the steam drum is placed on the cantilever slideway outside the boiler, the tower crane hanging point is removed, the hoisting pulley is pulled by the side direction to pull the steam drum to the position where the steam drum is in place, three groups of U-shaped hanging rods are arranged on the steam drum hanging beam, and the steam drum sliding platform and the hoisting machine tool are removed to finish hoisting the steam drum.
Further, the hoisting temporary support frame is arranged on the steel structure at the top end of one side of the boiler behind the central eccentric furnace, the hoisting temporary support frame is arranged on one side of the tower crane, the vertical hoisting tackle and the hoisting temporary support frame are fixedly connected through six upper lug plates, the lifting lug pin shafts of the vertical hoisting tackle and the steam drum are fixedly connected through four lower lug plates, the upper lug plates and the lower lug plates are Q235 steel plates with the thickness of 14mm, the limitation of the height of the hoisting temporary support frame is overcome, and the problem that the lifting rings of the vertical hoisting tackle are inconsistent with the lifting lug directions of the steam drum is solved.
Further, the drum sliding platform is arranged at the position behind the central eccentric furnace of the boiler, two guide rails are paved on the drum sliding platform, and the guide rails are fixed by limit plates.
Further, the vertical hoisting pulley comprises a winch, a pulley block, guide wheels and a steel wire rope, wherein the steel wire rope firstly passes through the pulley block by adopting a double-running-head forward-threading method, then is connected to two winches through three guide wheels, is driven and towed by the two winches, and the fixed pulley block is fixedly connected to the hoisting temporary support frame through six upper lug plates.
Further, the lateral traction hoisting pulley is fixedly connected with the steam drum through a steel wire rope, the lateral traction hoisting pulley comprises a winch, a pulley block, guide wheels and the steel wire rope, the steel wire rope firstly passes through the pulley block in a single running head sequential penetrating mode and then is connected to the winch through four guide wheels, the working rope number of the pulley block steel wire rope is 8, the problem that the sliding friction resistance of the steam drum is overcome is solved, the sliding speed of the steam drum is reduced, and the adverse impact to the impact vibration of the tower crane is reduced.
Further, at the time of the drum test crane, the drum was lifted about 300mm from the ground and left for 10 minutes.
Further, the tower crane adopts a FZQ1380 tower crane, a lifting mechanism of the tower crane is fixedly connected with the rear end of the steam drum through a sling, and a vertical lifting pulley is fixedly connected with the front end of the steam drum.
Further, a steel plate with the thickness of 30mm is placed between the front end support of the steam drum and the guide rail, and a guide limiting block is arranged at the bottom of the steel plate so as to prevent the steam drum from deviating from the slideway in the sliding process.
Further, the outside cantilever slideway of the boiler is arranged below the temporary lifting support frame and is connected with the drum sliding platform.
Further, the front end support and the rear end support are respectively bound and fixed with the steam drum through chain links, and the installation positions of the front end support and the rear end support of the steam drum are set according to the length of an external cantilever slideway of the boiler, the size of a hoisting temporary support frame, and the hoisting capacity of a hoisting pulley and a tower crane in the vertical direction;
further, three groups of U-shaped suspenders are respectively arranged at the front part, the middle part and the rear part of the steam drum, and two ends of the U-shaped suspenders are fixedly connected to the steam drum hanging beam above the steam drum in place.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. according to the hoisting method provided by the invention, after the drum is vertically lifted to the specified height on the right side of the furnace through the vertical lifting pulley, the drum is pulled into the boiler from the right side through the lateral pulling lifting pulley, so that the drum can smoothly slide horizontally and laterally on the drum sliding platform, the drum is smoothly hoisted in place, and better economic benefits are created.
2. When the conventional hoisting machinery on the construction site cannot meet the hoisting requirement of the steam drum and the cost of separately renting the hoisting machinery is high, the hoisting machine and the material with limited sites are properly utilized according to local conditions, the steam drum is reduced to deviate as much as possible in the hoisting process, the possibility of damage to the boiler or the steam drum due to collision is reduced, the steam drum is smoothly hoisted in place, the safety in the hoisting process is improved, and the hoisting cost is reduced.
Drawings
FIG. 1 is a flow chart of a boiler drum lifting process of the special construction of the present invention;
FIG. 2 is a plan view of a boiler drum lift of a particular construction of the present invention;
FIG. 3 is a schematic view of a vertical lifting block lifting drum of the present invention;
FIG. 4 is a schematic view of an upper ear panel and a lower ear panel of the present invention;
FIG. 5 is a schematic view of a drum lifting mechanical model in an embodiment of the invention;
FIG. 6 is a schematic view of a vertical hoisting tackle pulley block and wire rope reeving in an embodiment of the present invention;
FIG. 7 is a schematic view of a sling-binding steam drum in an embodiment of the invention;
in the attached drawings, a 1-boiler, a 2-tower crane, a 3-vertical lifting pulley, a 4-lateral traction lifting pulley, a 5-hoisting temporary support frame, a 6-steam drum sliding platform, a 7-steam drum, a 71-front end support, a 72-rear end support, an 8-boiler external cantilever slideway, a 9-guide rail, a 10-upper lug plate and a 11-lower lug plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the invention, and that these aspects of the invention may be practiced without these specific details.
As shown in fig. 1-4, a boiler drum lifting method with a special structure comprises the following steps:
(1) And (3) hoisting preparation: firstly, a hoisting temporary support frame 5 and a drum sliding platform 6 are installed, a hoisting pulley 3 in the vertical direction is installed on the hoisting temporary support frame 5, and a lateral traction hoisting pulley 4 is installed on a steel structure below the position of a drum 7 and the sliding platform 6;
(2) And (3) carrying a steam drum: firstly, using a drum transportation plate trailer to enable a drum 7 to enter a hoisting area from a construction road on the right side of a boiler, then unloading a tower crane 2 for installing the boiler 1 and a hoisting pulley 3 in the vertical direction, and preparing test hoisting after finishing work such as scribing;
(3) Steam drum test hanging: firstly starting a vertical lifting pulley 3 and a tower crane 2, lifting a steam drum 7 about 300mm away from the ground, staying for 10 minutes, checking whether each stress part of the tower crane 2, the vertical lifting pulley 3 and a lifting temporary support frame 5 has an abnormal condition, and performing formal lifting work after eliminating all abnormal conditions;
(4) And (3) vertically lifting the steam drum: firstly, a front end support 71 and a rear end support 72 are arranged below a steam drum 7, then a vertical lifting pulley 3 and a tower crane 2 are started, the steam drum 7 is lifted horizontally, vertically and stably, the levelness of the steam drum 7 is closely monitored in the lifting process, the steam drum 7 is kept horizontal as much as possible in the lifting process, the load rate of each lifting device is ensured to be within an allowable range, and the lifting is stopped until the bottom surface of the front end support 71 of the steam drum 7 reaches +64.340 elevation;
(5) The drum descends: firstly, installing a boiler external cantilever slideway 8 on one side of a boiler 1, then starting a vertical lifting pulley 3 and a tower crane 2, and slowly placing a front end support 71 of a steam drum 7 on the boiler external cantilever slideway 8;
(6) The drum slides transversely: firstly, dismantling a lifting point of the lifting pulley 3 in the vertical direction, then fixedly connecting the lateral traction lifting pulley 4 with the drum 7, then starting the lateral traction lifting pulley 4 and the tower crane 2, and slowly pulling the drum 7 into the boiler 1 on a guide rail 9 on the drum sliding platform 6;
(7) The steam drum is in place: when the rear end support 72 of the steam drum 7 is placed on the cantilever slideway 8 outside the boiler, the lifting point of the tower crane 2 is removed, the hoisting pulley 4 is pulled by the side direction to pull the steam drum 7 to the position where the steam drum is in place, three groups of U-shaped suspenders are arranged on the steam drum lifting beam, and the steam drum sliding platform and the hoisting machine tool are removed, so that the steam drum hoisting is completed.
As shown in fig. 2-3, the hoisting temporary support frame 5 is installed on the steel structure at the top end of one side of the boiler 1, which is located at the middle of the furnace, and the hoisting temporary support frame 5 is installed on one side of the tower crane 2, the vertical hoisting tackle 3 and the hoisting temporary support frame 5 are fixedly connected through six upper ear plates 10, the vertical hoisting tackle 3 and the lifting lug pin shaft of the steam drum 7 are fixedly connected through four lower ear plates 11, and the upper ear plates 10 and the lower ear plates 11 are made of Q235 steel plates with the thickness of 14mm, so that the limitation of the height of the hoisting temporary support frame 5 is overcome, and the problem that the lifting rings of the vertical hoisting tackle 3 and the lifting lug directions of the steam drum 7 are inconsistent is solved. The drum sliding platform 6 is arranged at the central furnace deflection rear position of the boiler 1, two guide rails 9 (43 kg/m) are paved on the drum sliding platform 6, the guide rails 9 are fixed by limiting plates, and the guide rails 9 are arranged to reduce the contact areas of the front end support 71 and the rear end support 72 of the drum 7 and the drum sliding platform 6, so that the sliding friction resistance is reduced. The material selection, the installation position, the installation form and the like of the hoisting temporary support frame 5 and the drum sliding platform 6 are specially designed. The vertical hoisting pulley 3 comprises a winch, a pulley block, guide wheels and a steel wire rope, wherein the steel wire rope firstly passes through the pulley block by adopting a double-running-head forward-passing method, then is connected to two winches through three guide wheels, is driven and pulled by the two winches, and the fixed pulley block is fixedly connected to the hoisting temporary support frame 5 through six upper lug plates 10. The tower crane 2 adopts a FZQ1380 tower crane, a lifting mechanism of the tower crane 2 is fixedly connected with the rear end of the steam drum 7 through a sling, and the vertical lifting pulley 3 is fixedly connected with the front end of the steam drum 7. Because two sets of hoisting equipment are adopted for combined hoisting, the level of operators and the performance parameters of the hoisting equipment are inconsistent, and difficulty is increased to hoisting operation, the operators should closely monitor the levelness of the steam drum 7 in the hoisting process, and the steam drum 7 is kept to be horizontal as much as possible in the hoisting process, so that the load rate of each hoisting equipment is ensured to be within an allowable range. According to the on-site arrangement condition, when the drum 7 is lifted, the tower crane 2 lifts the rear end of the drum 7, the vertical lifting pulley 3 lifts the front end of the drum 7, the temporary lifting support frame 5 is arranged, the in-place elevation, the safety distance and the shortest limit distance of the pulley block of the drum 7 are comprehensively considered, the installation height of the temporary lifting support frame meets the lifting requirement, and the strength, the stability and the like of the temporary lifting support frame are reliable. The lateral traction hoisting pulley 4 is fixedly connected with the steam drum 7 through a steel wire rope, the lateral traction hoisting pulley 4 comprises a winch, a pulley block, guide wheels and the steel wire rope, the steel wire rope firstly passes through the pulley block in a single running head sequential penetrating mode and then is connected to the winch through four guide wheels, the working rope number of the pulley block steel wire rope is 8, the multiplying power of the steel wire rope is properly increased under the condition of meeting the stress safety coefficient so as to reduce the traction speed, not only overcome the sliding friction resistance of the steam drum 7, but also reduce the sliding speed of the steam drum 7 and reduce the impact vibration adverse effect on the tower crane 2. After the drum 7 is vertically lifted to a specified height on the right side of the furnace, the drum 7 is pulled into the boiler 1 from the right side by pulling the lifting pulley 4 laterally, so that the process is realized, a stable drum sliding platform 6 capable of horizontally and laterally sliding the drum 7 is required, and meanwhile, measures should be taken to minimize the sliding friction force generated between the front end support 71, the rear end support 72 and the drum sliding platform 6 of the drum 7. The strength and stability of the installed drum sliding platform 6 are checked, and the use requirement is met. A steel plate with the thickness of 30mm is placed between the front end support 71 of the steam drum 7 and the guide rail 9, and a guide limiting block is arranged at the bottom of the steel plate to prevent the sliding process of the steam drum 7 from deviating from the slideway. The boiler external cantilever slideway 8 is arranged below the hoisting temporary supporting frame 5 and is connected with the drum sliding platform 6. The front end support 71 and the rear end support 72 are respectively bound and fixed with the steam drum 7 through chain links, and the installation positions of the front end support 71 and the rear end support 72 of the steam drum 7 are set according to the length of the external cantilever slideway 8 of the boiler, the size of the hoisting temporary support 5 and the hoisting capacities of the hoisting tackle 3 and the tower crane 2 in the vertical direction; the three groups of U-shaped suspenders are respectively arranged at the front part, the middle part and the rear part of the steam drum 7, and the two ends of the U-shaped suspenders are fixedly connected to the steam drum hanging beam above the steam drum 7.
Principle of operation
After the hoisting machine tool is installed, transporting the steam drum 7 to a hoisting area for unloading, carrying out test hoisting after scribing is completed, checking that each stressed part has no abnormal condition, horizontally and vertically and stably hoisting the steam drum after the front end support 71 and the rear end support 72 are installed below the steam drum 7, and stopping hoisting after the bottom surface of the front end support 71 of the steam drum 7 reaches +64.340 elevation; after the boiler external cantilever slideway 8 is installed, slowly placing the front end support 71 of the steam drum 7 on the boiler external cantilever slideway 8; removing the lifting point of the lifting pulley 3 in the vertical direction, and laterally pulling the lifting pulley 4 to slowly pull the steam drum 7 into the boiler 1 through the steam drum sliding platform 6; when the rear end support 72 of the drum 7 is placed on the cantilever slideway 8 outside the boiler, the lifting point of the tower crane 2 is removed, the lifting pulley 4 is pulled laterally to pull the drum 7 to the position where the drum is in place, and the drum sliding platform 6 and the lifting machine tool are removed after the three groups of U-shaped suspenders are installed, so that the drum lifting is completed.
Examples
As shown in fig. 5, taking a drum with an actual hoisting weight of 100T as an example, the load is calculated
Q j ＝QK d K b ＝100T×1.1×1.1＝121T
TABLE 1 load analysis table for each stress point in the lifting process
TABLE 2 FZQ1380 tower crane performance parameter table
| R(m) | 7-10 | 10-22 | 24 | 26 | 28 | 30 | 32 | 34 |
| Q(t) | 63 | 63 | 55.9 | 50.3 | 45.5 | 41.3 | 37.7 | 34.5 |
| R(m) | 36 | 38 | 40 | 42 | 44 | 46 | 48 | 50 |
| Q(t) | 31.6 | 29.1 | 26.8 | 24.7 | 22.8 | 21.1 | 19.5 | 18 |
Pulley block selection of a vertical hoisting pulley: the pulley block specification is selected from f2=69T as: h100×8g.
And (3) selecting a steel wire rope of the hoisting pulley in the vertical direction: the threading method of the steel wire rope in the pulley block adopts double running heads to be threaded in sequence, as shown in fig. 6, the fixed pulley 4 is a balance wheel, the number of working ropes is 7, the stress is 34.5T, the sum of the number of movable fixed pulleys is 6, the number of guide pulleys is 3, the table is checked to obtain the load coefficient, and the maximum tension of the steel wire rope of the pulley block is as follows: s is S n ＝αF/2＝0.18×69T÷2＝6.21T
Selecting 6×37+1 steel wire rope with nominal tensile strength 1850MPa and phi 24mm and breaking force 319.8KN
Selecting a winch of a hoisting pulley in the vertical direction: the maximum pulling force of the pulley block running rope is 62.1KN, and the rated pulling force of the winch is required to be not smaller than: 62.1 KN/0.85=73kn, and a single drum hoist with a rated tension of 100KN was selected.
Guide wheel selection of a vertical hoisting pulley: the pulley block is run the rope and is connected to the hoist engine through 3 leading wheels, establishes that ground direction pulley department wire rope contained angle is 90, then angle coefficient K gets 1.4, then the direction pulley atress is: q (Q) d ＝KS n ＝1.4X 6.21 t=8.7T, so h10×1k (open type) guide wheels are selected.
In the sliding process of the steam drum in the platform, the sliding contact surface of the support and the rail adopts a lubricating measure, and if the table is 0.1 in friction coefficient, f=fμ=120t×0.1=12t.
Selecting a pulley block of a lateral traction hoisting pulley: if the traction force F is greater than the friction force 12T, the H20X 4G pulley is selected.
Selecting a steel wire rope of a lateral traction hoisting pulley: the design is that assembly pulley wire rope fixed end is fixed on fixed assembly pulley, then has work rope number to be 8, and the leading wheel is 4, and the table is looked up and is obtained load coefficient alpha=0.167, and assembly pulley wire rope maximum tension is: s=αf=0.167×12t=2t, and a 6×37+1 steel wire rope with a nominal tensile strength of 1400MPa and a phi 19.5mm and a breaking force of 162KN is selected
The single running head is adopted to run in the same direction.
Lateral traction hoisting tackle guide wheel selection: the rope running of the traction pulley block is connected to the winch through 4 guide wheels, the included angle of the steel wire rope at the guide pulley is 90 degrees, the angle coefficient K is 1.4, and the stress of the guide pulley is as follows: q (Q) d ＝KS n =1.4×2t=2.8t, so an h5×1k (open type) guide wheel is selected.
Lateral traction hoisting tackle hoist selection: the maximum pulling force of the pulley block running rope is 20KN, and the rated pulling force of the winch is required to be not smaller than: 20 KN/0.85=2.35T, so a single drum hoist with a rated tension of 5T is selected.
The tower crane and the steam drum are bound by slings, as shown in figure 6, the slings are 6 multiplied by 37+1 steel wire ropes with nominal tensile strength of 1850MPa and phi 39.0mm, the breaking force is 852.8KN, and the slings are stressed by 6 yarns
TABLE 3 resource demand schedules
When the conventional hoisting machinery on the construction site cannot meet the hoisting requirement of the steam drum and the cost of separately renting the hoisting machinery is high, the hoisting machine and the material with limited sites are properly utilized according to local conditions, the steam drum is reduced to deviate as much as possible in the hoisting process, the possibility of damage to the boiler or the steam drum due to collision is reduced, the steam drum is smoothly hoisted in place, the safety in the hoisting process is improved, and the hoisting cost is reduced.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A method for hoisting a boiler drum with a special structure is characterized by comprising the following steps: the method comprises the following steps:
(1) And (3) hoisting preparation: firstly, installing a temporary support frame and a drum sliding platform, installing a vertical lifting pulley on the temporary support frame, and installing a lateral traction lifting pulley on a steel structure and the sliding platform below the position of the drum;
(2) And (3) carrying a steam drum: firstly, using a drum transportation plate vehicle to enable a drum to enter a hoisting area from a construction road on the right side of a boiler, then unloading a tower crane for installing the boiler and a hoisting pulley in the vertical direction, and preparing test hoisting after finishing works such as scribing;
(3) Steam drum test hanging: firstly starting a vertical lifting pulley and a tower crane, lifting a steam drum off the ground, checking whether abnormal conditions exist at each stressed part of the tower crane, the vertical lifting pulley and the temporary lifting support frame, and performing formal lifting work after all abnormal conditions are eliminated;
(4) And (3) vertically lifting the steam drum: firstly, installing a front end support and a rear end support below a steam drum, then starting a vertical lifting pulley and a tower crane, lifting the steam drum horizontally, vertically and stably, closely monitoring the levelness of the steam drum in the lifting process, keeping the steam drum level as much as possible in the lifting process, ensuring the load rate of each lifting device to be within an allowable range, and stopping lifting until the bottom surface of the front end support of the steam drum reaches +64.340 elevation;
(5) The drum descends: firstly, installing an external cantilever slideway of a boiler at one side of the boiler, then starting a vertical lifting pulley and a tower crane, and slowly placing a front end support of a steam drum on the external cantilever slideway of the boiler;
(6) The drum slides transversely: firstly dismantling a lifting point of a lifting pulley in the vertical direction, then fixedly connecting a lateral traction lifting pulley with a steam drum, then starting the lateral traction lifting pulley and a tower crane, and slowly pulling the steam drum into a boiler on a guide rail on a steam drum sliding platform;
(7) The steam drum is in place: when the rear end support of the steam drum is placed on the cantilever slideway outside the boiler, the tower crane hanging point is removed, the hoisting pulley is pulled by the side direction to pull the steam drum to the position where the steam drum is in place, three groups of U-shaped hanging rods are arranged on the steam drum hanging beam, and the steam drum sliding platform and the hoisting machine tool are removed to finish hoisting the steam drum.
2. The method for hoisting the boiler drum with the special structure according to claim 1, wherein the method comprises the following steps: the temporary lifting support frame is arranged on a steel structure at the top end of one side behind the central eccentric furnace of the boiler, the temporary lifting support frame is arranged on one side of the tower crane, the vertical lifting pulley is fixedly connected with the temporary lifting support frame through six upper lug plates, the lifting lug pin shafts of the vertical lifting pulley and the steam drum are fixedly connected through four lower lug plates, and the upper lug plates and the lower lug plates are Q235 steel plates with the thickness of 14 mm.
3. The method for hoisting the boiler drum with the special structure according to claim 1, wherein the method comprises the following steps: the steam drum sliding platform is arranged at the position of the boiler, which is located at the middle of the boiler, and two guide rails are paved on the steam drum sliding platform and are fixed by limiting plates.
4. The method for hoisting the boiler drum with the special structure according to claim 1, wherein the method comprises the following steps: the vertical hoisting pulley comprises windlass, pulley blocks, guide wheels and steel wire ropes, wherein the steel wire ropes firstly pass through the pulley blocks by adopting a double-running-head forward-threading method and then are connected to the two windlass through three guide wheels, and the fixed pulley blocks are fixedly connected to the hoisting temporary support frame through six upper lug plates.
5. The method for hoisting the boiler drum with the special structure according to claim 1, wherein the method comprises the following steps: the lateral traction hoisting pulley is fixedly connected with the steam drum through a steel wire rope, and comprises a winch, a pulley block, guide wheels and the steel wire rope, wherein the steel wire rope firstly passes through the pulley block in a single running head sequential penetrating mode and then is connected to the winch through four guide wheels.
6. The method for hoisting the boiler drum with the special structure according to claim 1, wherein the method comprises the following steps: when the steam drum is lifted, the steam drum is lifted to be about 300mm away from the ground and stays for 10 minutes.
7. The method for hoisting the boiler drum with the special structure according to claim 1, wherein the method comprises the following steps: the tower crane adopts FZQ1380 tower crane, and the lifting mechanism of the tower crane is fixedly connected with the rear end of the steam drum through a sling, and the vertical lifting pulley is fixedly connected with the front end of the steam drum.
8. The method for hoisting the boiler drum with the special structure according to claim 1, wherein the method comprises the following steps: the front end support and the rear end support are respectively bound and fixed with the steam drum through chain links.
9. The method for hoisting the boiler drum with the special structure according to claim 1, wherein the method comprises the following steps: the outside cantilever slideway of the boiler is arranged below the temporary lifting support frame and is connected with the drum sliding platform.
10. The method for hoisting the boiler drum with the special structure according to claim 1, wherein the method comprises the following steps: the three groups of U-shaped suspenders are respectively arranged at the front part, the middle part and the rear part of the steam drum, and the two ends of the U-shaped suspenders are fixedly connected to the steam drum hanging beam above the steam drum in place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310545198.0A CN116332049A (en) | 2023-05-15 | 2023-05-15 | Boiler drum hoisting method with special structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310545198.0A CN116332049A (en) | 2023-05-15 | 2023-05-15 | Boiler drum hoisting method with special structure |
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| Publication Number | Publication Date |
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| CN116332049A true CN116332049A (en) | 2023-06-27 |
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|---|---|---|---|
| CN202310545198.0A Pending CN116332049A (en) | 2023-05-15 | 2023-05-15 | Boiler drum hoisting method with special structure |
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| Country | Link |
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| CN (1) | CN116332049A (en) |
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- 2023-05-15 CN CN202310545198.0A patent/CN116332049A/en active Pending
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