CN109607371B - Hoisting method for large-scale component with asymmetric cross-gravity center - Google Patents
Hoisting method for large-scale component with asymmetric cross-gravity center Download PDFInfo
- Publication number
- CN109607371B CN109607371B CN201910052885.2A CN201910052885A CN109607371B CN 109607371 B CN109607371 B CN 109607371B CN 201910052885 A CN201910052885 A CN 201910052885A CN 109607371 B CN109607371 B CN 109607371B
- Authority
- CN
- China
- Prior art keywords
- lifting
- lifting lug
- lug
- arm support
- lifted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- 230000005484 gravity Effects 0.000 claims abstract description 23
- 238000003466 welding Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 230000001788 irregular Effects 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 102220152218 rs143647619 Human genes 0.000 description 1
- 102220024572 rs58403142 Human genes 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Jib Cranes (AREA)
Abstract
The invention discloses a hoisting method for a large-scale component with asymmetric cross-gravity center, which comprises the following steps: 1) calculating the strength of each lifting lug on the arm support; 2) calculating the welding seams of each lifting lug on the arm support; 3) selecting a corresponding lifting appliance according to the total weight of the lifted large-scale steel structural part; 4) calculating the stress condition of a hook head on the lifting appliance according to the gravity center position of the lifted large-scale steel structural member; 5) and (3) according to the calculated stress condition of the hook head on the lifting appliance, the root part of the boom on the large-scale steel structural member to be lifted is moved to lift the lifting lug, and the common lifting lug for moving and final assembly is integrally formed by using the steel wire rope strings which are connected in series, and is used as one side of a lifting point, and the boom final assembly is lifted by using the lifting lug as the other side of the lifting point. The invention solves the problem of hoisting the lifting lug of the large irregular steel structural member.
Description
Technical Field
The invention relates to the field of large-scale component hoisting, in particular to a hoisting method for large-scale components with asymmetric cross-center of gravity.
Background
The hoisting of large steel structural members generally designs the position, size and shape of hoisting lugs according to the shape, gravity center position, hoisting weight and hoisting equipment of the member. However, in the actual construction process, various factors are often limited, and the existing lifting lugs can be only used for lifting the structural member.
As shown in fig. 1 and 2, a 5000-ton floating crane boom is illustrated, and the middle root of the boom is designed, manufactured and transported to the site for final assembly by other supply companies, so that the root structure manufacturing and the lifting lug installation are completed, and only the existing lifting lug after the installation can be used for lifting. Install six groups of lugs on the well root structure: two groups are lifting lugs 1 (design weight 200T) for shifting the root part of the arm support, two groups are lifting lugs 2 (design weight 300T) for general assembly of the arm support, and two groups are lifting lugs 3 (design weight 300T) shared by shifting and general assembly.
As shown in fig. 3, it is known that, during lifting, a center of gravity is used as a boundary, and two sides of the center of gravity are respectively provided with a mounting point, so as to achieve balanced lifting at two sides. However, in the actual hoisting process, because the middle root structural member needs to be shifted to the head of the boom by 2.6m, the center of gravity changes, so that the stress deviation of the lifting lugs during hoisting is caused, the stress of the lifting lug on one side of the head of the boom is increased to 315T from 284T of the stress of a single lifting lug (the lifting lug 3 shared by shifting and final assembly) calculated originally, which is far greater than the design weight of the lifting lug, and meanwhile, the stress of the steel structure is calculated, which is not enough, as shown in fig. 4, if the large-scale steel structural member shifted is hoisted according to the conventional lifting lug, the single stress of the left lifting lug (the lifting lug 2 used by final assembly of. As shown in fig. 5, a six-point hoisting manner is adopted, but the root part of the boom is selected to displace the hoisting lifting lug 1 and the boom is assembled to use the resultant force of the lifting lug 2, and the resultant force of the lifting point reaches 739T, so that the left and right sides of the boom are subjected to unbalance loading of 477T, which exceeds the range of 1600T floating crane single-hook safety hoisting 720T. Therefore, the two hoisting modes cannot be smoothly hoisted by using a 1600T floating crane.
Another method is to reinstall two sets of assembled lifting lugs at corresponding positions on the arm support, which is relatively simple, but has two limitations: firstly, time factors are determined, the total assembly time is fixed and can not be changed, and two or three days need to issue drawings, carry out numerical control blanking, machine processing and welding, and the time is not in time; secondly, the whole boom is coated, if a new lifting lug needs to be welded, paint is damaged, the lifting lug is polished and coated again after being welded, and the labor, the cost and the time cost are high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a hoisting method for a large member with asymmetric cross-gravity center, and solves the problem of hoisting a lifting lug of a large irregular steel structural member.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hoisting method for large-scale components with asymmetric cross-center of gravity is characterized by comprising the following steps:
1) calculating the strength of each lifting lug on the arm support;
2) calculating the welding seams of each lifting lug on the arm support;
3) selecting a corresponding lifting appliance according to the total weight of the lifted large-scale steel structural part;
4) calculating the stress condition of a hook head on the lifting appliance according to the gravity center position of the lifted large-scale steel structural member;
5) and (3) according to the calculated stress condition of the hook head on the lifting appliance, the root part of the boom on the large-scale steel structural member to be lifted is moved to lift the lifting lug, and the common lifting lug for moving and final assembly is integrally formed by using the steel wire rope strings which are connected in series, and is used as one side of a lifting point, and the boom final assembly is lifted by using the lifting lug as the other side of the lifting point.
The strength of the lifting lug in the step 1) is the allowable load of the lifting lug, and the method specifically comprises the following steps:
a) normal stress
b) Shear stress
c) Extrusion strength of lifting lug
In the above formula, P is the lifting capacity of a single lifting lug, PLevel ofHorizontal force of a single lifting lug, FminPerpendicular to the direction of the P forceMinimum cross-sectional area, AminIs the smallest cross-sectional area parallel to the direction of the P force, [ sigma ]]Allowing positive stress for the material.
Allowable positive stress of the material
In the above formula, K is the safety factor, sigmasThe yield limit of the steel is selected according to the selected steel.
The welding seam of the lifting lug in the step 2)
In the above formula, Σ L is the total weld length, and K is the fillet height.
The lifting appliance is a 1600T double-hook floating crane.
The height difference of the two hook head steel wire ropes is less than 1 m.
In the technical scheme, as the center of gravity shifts 2.6m towards the head direction of the arm support, the method for hoisting the large-scale component with asymmetric center of gravity in a crossing mode provided by the invention has the advantages that when the component is assembled, hoisting lugs do not need to be added at other positions, the original shifting lugs are directly utilized, the hoisting problem is conveniently and simply solved, and the phenomenon that workers are driven to perform blanking to manufacture and install new hoisting lugs before hoisting is avoided.
Drawings
Fig. 1 is a schematic view of a hoisted boom;
fig. 2 is a top view of the boom of fig. 1;
FIG. 3 is a schematic view of a prior art center of gravity hoist;
FIG. 4 is a schematic view of the prior art center of gravity lifted after the displacement;
FIG. 5 is a schematic diagram of six point hoisting after displacement;
fig. 6 is a schematic view of the hoisting method of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 6, the method for hoisting a large member asymmetrically across the center of gravity provided by the invention is characterized by comprising the following steps:
1) calculating the strength of each lifting lug on the arm support;
2) calculating the welding seams of each lifting lug on the arm support;
3) selecting a corresponding lifting appliance according to the total weight of the lifted large-scale steel structural part;
4) calculating the stress condition of a hook head on the lifting appliance according to the gravity center position of the lifted large-scale steel structural member;
5) according to the calculated stress condition of the hook head on the lifting appliance, the root part of the boom on the lifted large-scale steel structural member is moved to lift the lifting lug 1, and the common lifting lug 3 for moving and final assembly is integrally formed by using the steel wire rope strings which are connected in series, and is used as one side of a lifting point, and the boom final assembly is lifted by using the lifting lug 2 as the other side of the lifting point. The root part of the arm support is shifted and hoisted on the left side of the gravity center, but the root part of the arm support is combined with the shifting and general assembly common lifting lug 3 to participate in hoisting points on the right side, and the lifting lugs are hoisted in a mode of intersecting with the gravity center.
Preferably, the strength of each lifting lug in the step 1) is an allowable load of the lifting lug, the design weight of the root-part-shifted lifting lug 1, the shifting and general-assembly common lifting lug 3 in the arm support is 300T/piece, and the design weight of the lifting lug 2 used for arm support general assembly is 200T/piece, specifically:
a) normal stress
Root shift hoisting lug 1 in arm support, shift and general assembly common lug 3:
due to [ sigma ]]Allowing positive stress (Newton/mm) for the material2I.e. mpa):
in the above formula, K is a safety factor, and generally takes a value of K between 2.0 and 3.0, where K is 2.5; sigmasIs the yield limit of steel, and is selected according to the value of the selected steel,s＝355Mpa。
therefore, σ < [ σ ] qualifies.
b) Shear stress
Root shift hoisting lug 1 in arm support, shift and general assembly common lug 3:
since [ τ ] ═ 0.6[ σ ] ═ 0.6 ═ 142 ═ 85.2MPa
Thus, τ < [ τ ] qualifies.
c) Extrusion strength of lifting lug
Root shift hoisting lug 1 in arm support, shift and general assembly common lug 3:
lifting lug 2 is used in arm support assembly:
thus, σExtrusion＜[σ]And (4) passing.
In the above formula, P is the lifting capacity of a single lifting lug, PLevel ofFor horizontal force of a single lifting lug, here by PLevel ofCalculated as 0.6 × P, FminIs the smallest cross-sectional area (mm) perpendicular to the P force direction2)。
Root shift hoisting lug 1 in arm support, shift and general assembly common lug 3:
F1min＝2×[75×(250-80)+2×40×(200-80)]＝44700mm2
lifting lug 2 is used in arm support assembly:
F2min＝2×[50×(225-70)+2×35×(180-70)]＝30900mm2
Aminis the smallest cross-sectional area (mm) parallel to the P force direction2)。
Root shift hoisting lug 1 in arm support, shift and general assembly common lug 3:
A1min＝75×(250-80)+2×40×(200-80)＝22350mm2
lifting lug 2 is used in arm support assembly:
A2min＝50×(225-70)+2×35×(180-70)＝15450mm2
preferably, the welding seam of each lifting lug in the step 2)
(Kg/mm2) And the lifting lug is welded on the side plate.
Root shift hoisting lug 1 in arm support, shift and general assembly common lug 3:
lifting lug 2 is used in arm support assembly:
thus, τ < [ τ ] qualifies.
In the above formula, Σ L is the total weld length (mm), and K is the fillet height (mm);
L1＝1200*2mm
L2＝800*2mm
[τ]＝0.6[σ]＝0.6*142＝85.2MPa
preferably, the weight of the cantilever crane assembly is about 1000T, 1600T floating crane double-hook hoisting is selected, and the single-hook safe hoisting load of the 1600T floating crane is not more than 720T.
Preferably, the respective stress conditions of the left hook and the right hook are calculated according to the gravity center position of the whole boom during final assembly (as shown in fig. 6), and the stress conditions are calculated according to a moment balance formula and the weight and the gravity center of the boom:
the arm support assembly uses the lifting lug 2 to bear force:
the root part in the arm support is shifted and hoisted the lifting lug 1, shifted and assembled to share the lifting lug 3 and is stressed:
the steel wire rope stress used by the lifting lug 2 for the arm support assembly is as follows:
F1＝G1÷Sin75.4°＝426*Sin75.4°＝441T
the stress resultant force of steel wire ropes used by the root shifting hoisting lug 1 and the shifting and general assembly common hoisting lug 3 in the arm support is as follows:
F2＝G2÷Sin78.8°＝574÷Sin78.8°＝586T
the steel wire ropes used by the root shifting hoisting lug 1 and the shifting and general assembly common lug 3 in the arm support are respectively stressed as follows:
F21＝F22＝586÷2＝293T
the root part of the arm support is provided with two groups of lifting lugs 1 for shifting and lifting, and the common lifting lug 3 for shifting and assembling, and the respective stress is 147T, which is less than the design weight of the lifting lug, so the scheme is feasible.
Preferably, appropriate hoisting shackles and steel wire ropes are configured according to the actual stress conditions of the two hooks. And because the angle of the hook head is overlarge, the method that the two hook heads are bound by the steel wire rope is adopted, the angle of the hook head is reduced, and the unhooking phenomenon in the hoisting process is prevented.
The height difference of the two hook head steel wire ropes is less than 1 m.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (4)
1. A hoisting method for large-scale components with asymmetric cross-center of gravity is characterized by comprising the following steps:
1) calculating the strength of each lifting lug on the arm support;
2) calculating the welding seams of each lifting lug on the arm support;
3) selecting a corresponding lifting appliance according to the total weight of the lifted large-scale steel structural part;
4) calculating the stress condition of a hook head on the lifting appliance according to the gravity center position of the lifted large-scale steel structural member;
5) according to the calculated stress condition of the hook head on the lifting appliance, the root part of the arm support on the large-scale steel structural member to be lifted is shifted to lift the lifting lug, the shifting and general assembly shared lifting lug is integrated by using the serially connected steel wire rope string as one side of a lifting point, the arm support general assembly uses the lifting lug as the other side of the lifting point to be lifted,
wherein the lifting appliance is a 1600T double-hook floating crane
The height difference of two hook head steel wire ropes of the 1600T double-hook floating crane is less than 1 m.
2. The hoisting method for the large-scale component with the asymmetrical cross-center of gravity as claimed in claim 1, is characterized in that: the strength of the lifting lug in the step 1) is the allowable load of the lifting lug, and the method specifically comprises the following steps:
a) normal stress
b) Shear stress
c) Extrusion strength of lifting lug
In the above formula, P is the lifting capacity of a single lifting lug, PLevel ofHorizontal force of a single lifting lug, FminIs the smallest cross-sectional area perpendicular to the direction of the P force, AminIs the smallest cross-sectional area parallel to the direction of the P force, [ sigma ]]Allowing positive stress for the material.
3. The hoisting method for the large-scale component with the asymmetrical cross-center of gravity as claimed in claim 2, characterized in that: allowable positive stress of the material
In the above formula, K is the safety factor, sigmasThe yield limit of the steel is selected according to the selected steel.
4. The hoisting method for the large-scale component with the asymmetrical cross-center of gravity as claimed in claim 1, is characterized in that: the welding seam of the lifting lug in the step 2)
In the above formula, ∑LFor the full weld length, K is the fillet height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910052885.2A CN109607371B (en) | 2019-01-21 | 2019-01-21 | Hoisting method for large-scale component with asymmetric cross-gravity center |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910052885.2A CN109607371B (en) | 2019-01-21 | 2019-01-21 | Hoisting method for large-scale component with asymmetric cross-gravity center |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109607371A CN109607371A (en) | 2019-04-12 |
| CN109607371B true CN109607371B (en) | 2020-09-11 |
Family
ID=66018921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910052885.2A Active CN109607371B (en) | 2019-01-21 | 2019-01-21 | Hoisting method for large-scale component with asymmetric cross-gravity center |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109607371B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111914428B (en) * | 2020-08-11 | 2024-08-27 | 一重集团大连工程技术有限公司 | Design checking method for large container lifting cover |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO149074C (en) * | 1980-11-10 | 1984-02-08 | Malmen Olle | PROCEDURE FOR ASSEMBLY OF PIPES FOR A PIPE PIPE, AND TOOL FOR THE PROCEDURE |
| CN101434366B (en) * | 2008-12-12 | 2013-06-19 | 宁夏送变电工程公司 | Hoisting tool and hoisting method for column component |
| CN101759101A (en) * | 2008-12-24 | 2010-06-30 | 上海市基础工程公司 | Asymmetrical structure air posture adjusting method |
| CN107444996A (en) * | 2017-09-01 | 2017-12-08 | 中交第航务工程局有限公司 | A kind of large-scale component sling system and hanging method |
-
2019
- 2019-01-21 CN CN201910052885.2A patent/CN109607371B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109607371A (en) | 2019-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101549833A (en) | Method for turning over large member | |
| CN101660295A (en) | Hoisting method of arch bridge arch rib or beam body along bridge direction and used cable balance wheel | |
| CN109607371B (en) | Hoisting method for large-scale component with asymmetric cross-gravity center | |
| CN111017695A (en) | Process for hoisting large ship block by matching crawler crane with hoisting system | |
| CN110562850A (en) | Main tower integral hoisting system and method | |
| CN108946475B (en) | Overturning and hoisting system and method for horizontal equipment | |
| CN116216541A (en) | Steel reinforcement cage hoist device | |
| CN206872270U (en) | A kind of device of across the railway cluster lifting of large-tonnage railway single freely-supported trough girder | |
| CN102050377B (en) | Method for installing combined hoist and oil production platform drilling equipment | |
| CN201961951U (en) | Internal operation free large cylinder sling | |
| CN202164042U (en) | Grab bucket capable of preventing steel wire rope from falling off | |
| CN105947910B (en) | The hoisting of FPSO crane superstructures | |
| CN206088728U (en) | Novel large -scale gallows of taking a trial run | |
| CN117142315A (en) | Hoisting method with uniform stress | |
| CN201385979Y (en) | Rotary lifting bent | |
| CN109534187B (en) | Hoisting method suitable for hinged propeller strut on full-rotation floating crane ship | |
| CN203833520U (en) | Crane boom and crane | |
| CN217376990U (en) | Hoisting equipment for large steel structural part | |
| CN112141874B (en) | Installation method of dust hood in limited space | |
| CN112456305A (en) | Linear segmented turning-over method | |
| CN211619741U (en) | Multifunctional hoisting balance beam | |
| CN108033368A (en) | A kind of gib arm of crane head assembly and crane | |
| CN203667795U (en) | Suspensory rigging adopting series connection of five groups of vertically connected pulley blocks | |
| CN110921486A (en) | Multifunctional hoisting balance beam | |
| CN107055356A (en) | A kind of new tower crane load lifting limiter arrangement form |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210913 Address after: 200125 No. 3261 Dongfang Road, Shanghai, Pudong New Area Patentee after: SHANGHAI ZHENHUA HEAVY INDUSTRIES Co.,Ltd. Patentee after: CCCC HIGHWAY BRIDGES NATIONAL ENGINEERING RESEARCH CENTER Co.,Ltd. Address before: 200125 No. 3261 Dongfang Road, Shanghai, Pudong New Area Patentee before: SHANGHAI ZHENHUA HEAVY INDUSTRIES Co.,Ltd. |