CN103697979B - A kind of method that self-elevating drilling platform cantilever beam is weighed - Google Patents
A kind of method that self-elevating drilling platform cantilever beam is weighed Download PDFInfo
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Abstract
A kind of method that self-elevating drilling platform cantilever beam is weighed, weigh a little by arranging two on harbour, design special support plinth of weighing, the ground gone to dock bears the most weight of semi-girder, thus the load making main deck bear reduces, and then the carrying out of semi-girder overall time is weighed, and do not need to strengthen structure under main deck, avoid a large amount of structural strengthening work and paint destruction, and precisely, safely can weigh to semi-girder.
Description
Technical field
The present invention relates to oceanographic engineering drilling platform building technology field, be specifically related to a kind of method that self-elevating drilling platform cantilever beam is weighed.
Background technology
The object of weighing to semi-girder is to determine its weight, center of gravity, and then uses as the balancing weight of drilling platform inclining experiment.The weight of balancing weight, the accuracy of center of gravity, will directly have influence on the success or failure of inclining experiment, therefore needs to take reliable Weighing method to obtain semi-girder delicate, center of gravity parameter.
Weighing operation need make on main deck at semi-girder, install after, below semi-girder left and right sides track, several hydraulic jack are set, it coordinates LOAD CELLS, utilize lifting jack by semi-girder jacking to vacant state, then by calculating the reading of each LOAD CELLS, the weight of semi-girder, center of gravity is obtained.Because the main deck design load-bearing capacity of drilling platform is lower, and the general assembly (TW) of semi-girder about 1700 tons, and the quantity of weighing a little is no more than 6, otherwise bigger error, so the design load of main deck cannot meet the demand of weighing.For addressing this problem, the Weighing method generally taked both at home and abroad has two kinds:
Method one: by semi-girder slippage to the left, makes left rail be on the longitudinal bulkhead structure of hull, the main deck then under left and right side track is respectively arranged 3 and weigh a little.Its shortcoming is: the method need do a large amount of structural strengthenings below the main deck under right rail, is connected by main deck with bottom structure, to prevent main deck impaired.So will produce additional workload, spillage of material and paint to destroy.
Method two: first by semi-girder slippage to the left, makes left rail be on the longitudinal bulkhead structure of hull, the main deck under left rail arranges 3 and weighs a little, weighs up the weight in left side; Then by semi-girder slippage to the right, right rail is on the longitudinal bulkhead structure of hull, the main deck under right rail arranges 3 and weighs a little, weigh up the weight on right side, then gather the weight, the center of gravity that calculate semi-girder.Its shortcoming is: the method will be weighed and be carried out at twice, fails overall time to complete, and weighing process is comparatively large by environmental influence, and such as, the impact of wind speed will cause result of calculation to occur larger deviation.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of method that better self-elevating drilling platform cantilever beam is weighed, weigh a little by arranging two on harbour, the ground that goes to dock bears the most weight of semi-girder, the load that main deck is born reduces, thus weighing semi-girder overall time, neither need to strengthen structure under main deck, save time material-saving, cost-saving, turn avoid the impact of weighing process by environment, significantly reduce error, thus realize precise weighing.
In order to achieve the above object, the technical scheme that the present invention takes is:
The method that self-elevating drilling platform cantilever beam is weighed, comprises the following steps:
1) platform is when the other pitching pile of harbour, makes stern transom plate towards harbour, and need ensure that the distance on stern transom plate and quayside edge is less than the maximum slip length of semi-girder 1;
2) on Foundation of Wharf Gantry Crane track, determine two position A and D weighed a little by line, be in the below of semi-girder two long rails respectively, and three layers of box-beam structure 3 are set, fully to disperse the load of harbour; The transcerse bulkhead structure place of the main deck 5 simultaneously under semi-girder track arranges four position B, C, E, F weighed a little;
3) actual range of hull stern transom plate apart from Foundation of Wharf Gantry Crane track is measured, as semi-girder 1 slippage length value out;
4) by statistical framework and device inventory, calculate the theoretical weight of semi-girder 1, center-of-gravity value, the principle of recycling space system of parallel forces balance, estimates each load of a little bearing of weighing;
5) select corresponding hydraulic jack 9 and LOAD CELLS 10 according to each expectation load situation of weighing a little, ensure that its working range is greater than estimated carrying;
6) inquire about harbour ground data, confirm its load-bearing capacity, then according to the relation of power and pressure:
F＝P·S
F-power, P-pressure, S-lifting surface area
Calculate the bearing area determined needed for each weighing a little, thus design and produce the box-beam structure met the demands;
7) on harbour weighing device 2 and main deck weighing device 4, hydraulic jack 9 and LOAD CELLS 10 is placed, described main deck weighing device 4 comprises the first support column 8, the bottom of the first support column 8 is placed on the first case beam 7 in Ship Structure 6, and the top of the first support column 8 is placed with hydraulic jack 9;
8) slippage semi-girder 1 to desired location, jacking hydraulic jack 9, the reading of monitoring each point sensor is needed in jacking process, when each point reading is close to when estimating load, the top lift of adjustment each point, to reach predetermined load, when semi-girder 1 completely unsettled and only supported by 6 dynamometry hydraulic jack 9 time, read rapidly the reading of six LOAD CELLS 10 simultaneously;
9) repeat jacking three times, read three measured values, get its mean value, as the basis of semi-girder 1 weight, center of gravity.
The support plinth of described harbour weighing device 2 comprises on harbour face lays two the second long case beams 11, stacking two-layer 3rd small box girder 13 on the second long case beam 11,3rd small box girder 13 end face welds a second main support column 15, down tube 12, stull 14 are connected to carry out aiding the strong to increase stability with the second main support column 15, utilize code plate to be fixed between second long case beam 11, the 3rd small box girder 13, down tube 12 is welded on the second long case beam 11.
The evaluation method of described each a little suffered load of weighing is:
The theoretical weight G of known semi-girder and centre of gravity place and the position of respectively weighing a little, because weighing of semi-girder is a little symmetrically arranged, be simplified to plane force system analysis, wherein FA be weigh A and D make a concerted effort, FB be weigh B and E make a concerted effort, FC be weigh C and F make a concerted effort
First suppose that C point does not stress, according to moment equilibrium condition:
G·LA＝FB·(LA+LB)
G·LB＝FA·(LA+LB)
Wherein: LA is the moment of A point to theoretical weight G, and LB is the moment of B to theoretical weight G,
Calculate the anchorage force of A and B point: FA and FB;
Add the anchorage force FC of C point again, share the stressed of FB, thus obtain force analysis result: FB and FC;
Each simplification made a concerted effort FA, FB and FC is divided into two, the final expectation load situation of namely obtain weighing some A, B, C, D, E, F.
Advantage of the present invention: weigh a little by arranging two on harbour, the ground that goes to dock bears the most weight of semi-girder, the load that main deck is born reduces, thus is weighed by the carrying out of semi-girder overall time, and does not need to strengthen structure under main deck.
Accompanying drawing explanation
Fig. 1 is a layout schematic diagram of weighing, Fig. 1-a main hull vertical view, Fig. 1-b semi-girder track vertical view.
Fig. 2 is that harbour is weighed a schematic diagram.
Fig. 3 is that main deck is weighed a schematic diagram.
Fig. 4 is the support plinth structural representation of harbour weighing device 2.
Fig. 5 is that semi-girder 1 plane force system carries out analysis schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
The method that self-elevating drilling platform cantilever beam is weighed, comprises the following steps:
1) platform is when the other pitching pile of harbour, makes stern transom plate towards harbour, and need ensure that the distance on stern transom plate and quayside edge is less than the maximum slip length of semi-girder 1;
2) on Foundation of Wharf Gantry Crane track, determine two position A and D weighed a little by line, be in the below of semi-girder two long rails respectively, and three layers of box-beam structure 3 are set, fully to disperse the load of harbour; The transcerse bulkhead structure place of the main deck 5 simultaneously under semi-girder track arranges four position B, C, E, F weighed a little, as shown in Figure 1;
3) actual range of hull stern transom plate apart from Foundation of Wharf Gantry Crane track is measured, as semi-girder 1 slippage length value out;
4) by statistical framework and device inventory, calculate the theoretical weight of semi-girder 1, center-of-gravity value, the principle of recycling space system of parallel forces balance, estimates each load of a little bearing of weighing;
5) select corresponding hydraulic jack 9 and LOAD CELLS 10 according to each expectation load situation of weighing a little, ensure that its working range is greater than estimated carrying;
6) inquire about harbour ground data, confirm its load-bearing capacity, then according to the relation of power and pressure:
F＝P·S
F-power, P-pressure, S-lifting surface area
Calculate the bearing area determined needed for each weighing a little, thus design and produce the box-beam structure met the demands;
7) on harbour weighing device 2 and main deck weighing device 4, hydraulic jack 9 and LOAD CELLS 10 is placed, as shown in Figure 2 and Figure 3, described main deck weighing device 4 comprises the first support column 8, the bottom of the first support column 8 is placed on the first case beam 7 in Ship Structure 6, and the top of the first support column 8 is placed with hydraulic jack 9;
8) slippage semi-girder 1 to desired location, jacking hydraulic jack 9, the reading of monitoring each point sensor is needed in jacking process, when each point reading is close to when estimating load, the top lift of adjustment each point, to reach predetermined load, when semi-girder 1 completely unsettled and only supported by 6 dynamometry hydraulic jack 9 time, read rapidly the reading of six LOAD CELLS 10 simultaneously;
9) repeat jacking three times, read three measured values, get its mean value, as the basis of semi-girder 1 weight, center of gravity.
With reference to Fig. 4, the support plinth of described harbour weighing device 2 comprises on harbour face lays two the second long case beams 11, stacking two-layer 3rd small box girder 13 on the second long case beam 11,3rd small box girder 13 end face welds a second main support column 15, down tube 12, stull 14 are connected to carry out aiding the strong to increase stability with the second main support column 15, utilize code plate to be fixed between second long case beam 11, the 3rd small box girder 13, down tube 12 is welded on the second long case beam 11.
The evaluation method of described each a little suffered load of weighing is:
The theoretical weight G of known semi-girder and centre of gravity place and the position of respectively weighing a little, because weighing of semi-girder is a little symmetrically arranged, be simplified to plane force system analysis, as shown in Figure 5, wherein FA be weigh A and D make a concerted effort, FB be weigh B and E make a concerted effort, FC be weigh C and F make a concerted effort
First suppose that C point does not stress, according to moment equilibrium condition:
G·LA＝FB·(LA+LB)
G·LB＝FA·(LA+LB)
Wherein: LA is the moment of A point to theoretical weight G, and LB is the moment of B to theoretical weight G,
Calculate the anchorage force of A and B point: FA and FB;
Add the anchorage force FC of C point again, share the stressed of FB, thus obtain force analysis result: FB and FC;
Each simplification made a concerted effort FA, FB and FC is divided into two, the final expectation load situation of namely obtain weighing some A, B, C, D, E, F.
Claims (3)
1. a self-elevating drilling platform cantilever beam method of weighing, is characterized in that, comprise the following steps:
1) platform is when the other pitching pile of harbour, makes stern transom plate towards harbour, and need ensure that the distance on stern transom plate and quayside edge is less than the maximum slip length of semi-girder (1);
2) on Foundation of Wharf Gantry Crane track, determine two position A and D weighed a little by line, be in the below of semi-girder two long rails respectively, and three layers of box-beam structure (3) are set, fully to disperse the load of harbour; The transcerse bulkhead structure place of the main deck (5) simultaneously under semi-girder track arranges four position B, C, E, F weighed a little;
3) actual range of hull stern transom plate apart from Foundation of Wharf Gantry Crane track is measured, as semi-girder (1) slippage length value out;
4) by statistical framework and device inventory, calculate the theoretical weight of semi-girder (1), center-of-gravity value, the principle of recycling space system of parallel forces balance, estimates each load of a little bearing of weighing;
5) select corresponding hydraulic jack (9) and LOAD CELLS (10) according to each expectation load situation of weighing a little, ensure that its working range is greater than estimated carrying;
6) inquire about harbour ground data, confirm its load-bearing capacity, then according to the relation of power and pressure:
F＝P·S
F-power, P-pressure, S-lifting surface area
Calculate the bearing area determined needed for each weighing a little, thus design and produce the box-beam structure met the demands;
7) on harbour weighing device (2) and main deck weighing device (4), hydraulic jack (9) and LOAD CELLS (10) is placed, described main deck weighing device (4) comprises the first support column (8), the bottom of the first support column (8) is placed on the first case beam (7) in Ship Structure (6), and the top of the first support column (8) is placed with hydraulic jack (9);
8) slippage semi-girder (1) is to desired location, jacking hydraulic jack (9), the reading of monitoring each point sensor is needed in jacking process, when each point reading is close to when estimating load, the top lift of adjustment each point, to reach predetermined load, when semi-girder (1) completely unsettled and only supported by 6 dynamometry hydraulic jack (9) time, read rapidly the reading of six LOAD CELLS (10) simultaneously;
9) repeat jacking three times, read three measured values, get its mean value, as the basis of semi-girder (1) weight, center of gravity.
2. a kind of self-elevating drilling platform cantilever beam according to claim 1 method of weighing, it is characterized in that: the support plinth of described harbour weighing device (2) comprises on harbour face lays two the second long case beams (11), at upper stacking two-layer 3rd small box girder (13) of the second long case beam (11), 3rd small box girder (13) end face welds a second main support column (15), down tube (12), stull (14) is connected to carry out aiding the strong to increase stability with the second main support column (15), second long case beam (11), code plate is utilized to be fixed between 3rd small box girder (13), down tube (12) is welded on the second long case beam (11).
3. a kind of self-elevating drilling platform cantilever beam according to claim 1 method of weighing, is characterized in that: the evaluation method of described each a little suffered load of weighing is:
The theoretical weight G of known semi-girder and centre of gravity place and the position of respectively weighing a little, because weighing of semi-girder is a little symmetrically arranged, be simplified to plane force system analysis, wherein FA be weigh A and D make a concerted effort, FB be weigh B and E make a concerted effort, FC be weigh C and F make a concerted effort
First suppose that C point does not stress, according to moment equilibrium condition:
G·LA＝FB·(LA+LB)
G·LB＝FA·(LA+LB)
Wherein: LA is the moment of A point to theoretical weight G, and LB is the moment of B to theoretical weight G,
Calculate the anchorage force of A and B point: FA and FB;
Add the anchorage force FC of C point again, share the stressed of FB, thus obtain force analysis result: FB and FC;
Each simplification made a concerted effort FA, FB and FC is divided into two, the final expectation load situation of namely obtain weighing some A, B, C, D, E, F.
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| CN104390684A (en) * | 2014-11-14 | 2015-03-04 | 惠生（南通）重工有限公司 | Method for weighing skid-mounted modular drilling machine |
| CN105332366B (en) * | 2015-10-28 | 2017-10-20 | 中国海洋石油总公司 | Increase the method and device of jack-up unit cantilever beam covering power |
| CN107687163B (en) * | 2016-08-05 | 2019-11-01 | 中集海洋工程研究院有限公司 | The wearing plate replacing options of jack-up unit cantilever beam |
| CN108519140A (en) * | 2018-03-16 | 2018-09-11 | 南通振华重型装备制造有限公司 | A kind of cantilever beam experiment of weighing method |
| CN108457261B (en) * | 2018-03-16 | 2019-11-15 | 南通振华重型装备制造有限公司 | A kind of self-elevating drilling platform cantilever beam rig floor experiment of weighing system and method |
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| CN85202621U (en) * | 1985-06-27 | 1986-12-24 | 冶金工业部中南冶金地质勘探公司六零七队 | Device for assaying drilling pressure |
| US5419657A (en) * | 1992-05-08 | 1995-05-30 | Rowan Companies, Inc. | Method and apparatus for transferring a structure from a jack-up rig to a fixed platform |
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| CN201540153U (en) * | 2009-12-11 | 2010-08-04 | 大连船舶重工集团有限公司 | Self-elevating drilling platform cantilever beam weighing structure |
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2014
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Patent Citations (4)
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| CN85202621U (en) * | 1985-06-27 | 1986-12-24 | 冶金工业部中南冶金地质勘探公司六零七队 | Device for assaying drilling pressure |
| US5419657A (en) * | 1992-05-08 | 1995-05-30 | Rowan Companies, Inc. | Method and apparatus for transferring a structure from a jack-up rig to a fixed platform |
| CN101487755A (en) * | 2009-02-27 | 2009-07-22 | 西安信通控制系统有限责任公司 | Test system and method for drill platform mass centre |
| CN201540153U (en) * | 2009-12-11 | 2010-08-04 | 大连船舶重工集团有限公司 | Self-elevating drilling platform cantilever beam weighing structure |
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