CN104420453A - Integral jointing method of cantilever beam of self-elevating drilling platform - Google Patents
Integral jointing method of cantilever beam of self-elevating drilling platform Download PDFInfo
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- CN104420453A CN104420453A CN201310367137.6A CN201310367137A CN104420453A CN 104420453 A CN104420453 A CN 104420453A CN 201310367137 A CN201310367137 A CN 201310367137A CN 104420453 A CN104420453 A CN 104420453A
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- barge
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
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Abstract
The invention provides an integral jointing method of a cantilever beam of a self-elevating drilling platform. The method is characterized in that the cantilever beam and a main hull are jointed; a towing position, a supporting point and a clamping point are arranged on the main hull in advance, wherein the supporting point is used for supporting the cantilever beam during drilling, and the clamping point is used for fixing the end part of the cantilever beam; a ballast system in a preset ratio is arranged on the main hull. The method comprises the steps of providing a barge on which a barge ballast system is arranged, and initially aligning and positioning the barge with the main hull; B, launching the cantilever beam to the barge through a slipway; C, accurately aligning and positioning the main hull with the barge; D, sliding the cantilever beam to reach the preset position on the main hull to finish the jointing of the cantilever beam and the main hull, wherein the floating states of the main hull and the barge are gradually adjusted during sliding. With the adoption of the method, the integrity of a cantilever beam module can be ensured, the problem of renting a large floating crane or a shore crane can be solved, and the risk that the pile insertion is failed to cause the failure of integral jointing can be avoided.
Description
Technical field
The present invention relates to the method that a kind of semi girder entirety is closed up, particularly relate to a kind of for the semi girder closure workmanship in beam type self-elevating drilling platform building course.
Background technology
Self-elevating drilling platform is a kind of mobile offshore drilling unit, general employing semi girder drilling mode, both independently well can be drilled, also producing well can be completed by cantilever on jacket platform, semi girder is the functional module of self-elevating drilling platform, comprises the equipment such as semi girder 10, derrick 10b, rig floor 10a, drillingrig base.Completed the displacement of longitudinal direction when it operates by semi girder sliding system, complete well head transverse shifting by rig floor slide device or X-Y type slide device.
The construction of semi girder integral moduleization is the main flow of current build model, namely the overall package of semi girder is completed in different place, comprise above-mentioned in derrick, rig floor, drillingrig base and drilling equipment etc., then carry out entirety with main hull and close up, modularization build model ensures that the building course of module and main hull walks abreast, shortening production cycle, also avoids occurring the problem of the crowded and inadequacy of lifting capacity in place in building course, is also that platform safety is built and the main flow of fast construction.
Existing semi girder closed form is mainly divided into segmental hoisting method, and pitching pile sliding method.
Be existing segmental hoisting method schematic diagram see Fig. 1, as shown in the figure, block system is mainly divided into three sections semi girder, derrick, and rig floor and semi girder three modules are built respectively, utilizes crane barge or shore tackle to divide 3 liftings.
But, segmental hoisting method along with the change of main flow self-elevating drilling platform size large, semi girder weight is also increasing, overall weight reaches and is increased to more than 5000 tons by 1500 tons, shore tackle and common crane barge can not meet its integral hoisting and close up, little module folding method will be adopted, cause lifting frequency increase and close up cycle stretch-out.
See " integral installation method of self-elevating drilling platform cantilever beam " that Fig. 2 provides for Chinese patent 201010173479, this patent adopts pitching pile sliding method, is pass through jacking system, complete standing of platform, pre-ballast makes spud leg stand firm, and the position of adjustment semi girder, realizes slippage semi girder.
But, pitching pile sliding method: during jack-up unit pitching pile, often because the condition of sea bed, the dislocation that some are trickle occurs, and the gap that closes up of semi girder and main hull is very little, now semi girder contacts with sea bed with building berth respectively with main hull, its relative position is not easy adjustment, may cause pitching pile failure, namely have entirety to close up the risk of failure, what will ensure jacking system and related system before pitching pile is functional to ensure that platform completes pitching pile and ballast in advance smoothly simultaneously.
Prior art
10 semi girders
10a rig floor
10b derrick
The present invention
100 main hulls
111 support points
112 concentrate on work at selected units
113 towage positions
200 semi girders
200a rig floor
200b derrick
201 slippage rollers
300 barges
The side of 300a barge
300b opposite side
301 semi girder sliding rails
302 slippage roller gear stakes
400 harbours
500 first anchoring systems
600 second anchoring systems
700 fenders
800 bumpers
S semi girder residue skidding distance
D space
Summary of the invention
In order to solve the problem, the object of the present invention is to provide the method that a kind of semi girder of self-elevating drilling platform entirety is closed up, namely the integrality of semi girder (derrick and rig floor) can be ensured, and without the need to renting more greatly or larger crane barge or shore tackle, save certain expense, avoid the possibility of pitching pile slippage failure simultaneously, and the man-hour that saving pitching pile causes, provide the important time to ensure for semi girder slides onto on main hull smoothly.
For reaching above-mentioned purpose, the invention provides the overall folding method of a kind of self-elevating drilling platform cantilever beam, for semi girder and main hull are closed up, wherein, described main hull is preset with towage position, and described semi girder is in drillng operation, for supporting the support point of described semi girder and concentrating on work at selected units for fixing described semi girder end, described main hull is also configured with the main hull ballasting system of preset blending ratio, the overall folding method of described self-elevating drilling platform cantilever beam comprises step:
A, provides a barge, described barge is configured with the barge ballasting system of preset blending ratio, described barge and the preliminary contraposition of described main hull is located;
B, by described semi girder from slipway launching to described barge;
C, locates described main hull and described barge exactitude position;
D, semi girder described in slippage, on the towage position of described main hull, completes described semi girder and described main hull closes up, and wherein, also comprises: in slipping, progressively adjusts the floading condition of described main hull and described barge.
The overall folding method of above-mentioned self-elevating drilling platform cantilever beam, wherein, described barge in described steps A and the preliminary contraposition of described main hull be for, by moving left and right described barge and by the center contraposition of the center of described barge and described main hull, the location of described barge be for, adopt the first anchoring system to go to dock other for described barge.
The overall folding method of above-mentioned self-elevating drilling platform cantilever beam, wherein, described barge in described step C and described main hull exactitude position comprise: described barge and the exactitude position of described main hull on upper-lower position and right position, the location of described main hull be for, adopt the second anchoring system by other for described main hull by described barge.
The overall folding method of above-mentioned self-elevating drilling platform cantilever beam, wherein, described barge and the exactitude position of described main hull on upper-lower position be for, regulate the floading condition of described barge by barge ballasting system or regulate the floading condition of described main hull to make the bottom surface of the described semi girder be positioned on main hull consistent with the height of described support point by described main hull ballasting system; Described barge and the exactitude position of described main hull on right position be for, adjust the center of described semi girder and the center contraposition of described main hull by described second anchoring system.
The overall folding method of above-mentioned self-elevating drilling platform cantilever beam, wherein, the slippage in described step D is track slippage, wherein, before described step B, also comprises steps A 1, lay semi girder sliding rail on described barge; Steps A 2, arranges slippage roller in the bottom surface of described semi girder.
The overall folding method of above-mentioned self-elevating drilling platform cantilever beam, wherein, steps A 3 is also comprised after described steps A 2, on described main hull, fixed pulley is set, movable pulley is set on described semi girder, electric winch is set on described barge and connects the wire rope of described electric winch and described fixed pulley and movable pulley.
The overall folding method of above-mentioned self-elevating drilling platform cantilever beam, wherein, also comprises steps A 3 after described steps A 2, arranges the pushing tow system for the slippage on described semi girder sliding rail of semi girder described in pushing tow on described barge.
The overall folding method of above-mentioned self-elevating drilling platform cantilever beam, wherein, is also provided with fender or bumper between described barge and harbour, between described barge and described main hull.
The overall folding method of above-mentioned self-elevating drilling platform cantilever beam, wherein, the gap formed between the end of described semi girder sliding rail and the end of described barge is also provided with roller and keeps off stake.
The overall folding method of above-mentioned self-elevating drilling platform cantilever beam, wherein, the floading condition progressively adjusting described main hull and described barge in described step D be for, slipping is arranged multiple adjusting stage by precomputation, in each adjusting stage, first stop slippage, then calculation value according to expectation adjusts described main hull ballasting system and barge ballasting system, to make the draft amount of described main hull and described barge keep a predetermined value respectively, and described barge keeps level.
The overall folding method of above-mentioned self-elevating drilling platform cantilever beam, wherein, also comprising detecting step in described step D, is in slipping, described semi girder stops slippage in described refuting when remain on board skidding distance is 5 to 3.5 meters, detects and fix the position of described semi girder.
Effect of the present invention:
1, tidal effect is offset,
The overall folding method of self-elevating drilling platform cantilever beam provided by the invention, closes up complicated and that precision is higher semi girder and is divided into two stages: 1) semi girder entirety is refuted launch a ship (load out), 2) semi girder is floating closes up.Wherein the first stage is the lower water mode on common meaning, and does not have required precision, and its risk is lower.Second stage, is that two floating things dock, then carries out semi girder slippage operation, counteract the impact of tide on water level.
2, sliding period is reduced
Compare existing technique pitching pile sliding method, save the process of semi girder pitching pile, pre-ballast, drainage ballast water, jack-up unit standing process (ballast water is let out in pitching pile precompressed placing) is even if on the completely perfect basis of system, also need the operating time connect in a couple of days.The overall folding method of self-elevating drilling platform cantilever beam provided by the invention, only needs two barges to dock, without the need to standing operation.
3, slippage risk is reduced
In slipping, also need constantly to carry out ballast water adjustment, different from existing hoisting, adjust in the process of carrying at this, along with the adjustment of ballast water, the weight of semi girder little by little will be transferred on main hull by barge.And there will not be unexpected transfer or lifting to lose the risk of hook.
4, precision is closed up high
As there is horizontal-shift or vertical deviation in slipping, being realized the adjustment of left and right skew by the tensioning of the left and right winch of anchoring system, by regulating the floading condition of barge to be easy to the deviation realizing short transverse, thus ensureing the precision of closing up.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Accompanying drawing explanation
Fig. 1 existing segmental hoisting method schematic diagram;
The pitching pile sliding method schematic diagram that Fig. 2 patent 201010173479 provides;
Fig. 3 semi girder sliding system of the present invention arranges top view;
Fig. 4 semi girder sliding system of the present invention arranges front view;
Fig. 4 a slippage roller structure figure;
The general arrangement schematic of the overall folding method of Fig. 5 self-elevating drilling platform cantilever beam of the present invention;
Fig. 5 a is part A enlarged drawing in Fig. 5;
Fig. 6 a is roller gear stake top view;
Fig. 6 b is roller gear stake front view;
Fig. 7 main hull sliding system of the present invention arranges figure;
Fig. 8 a to Fig. 8 f is semi girder slippage step embodiment schematic diagram of the present invention;
Fig. 9 semi girder is view when drillng operation.
Wherein, Reference numeral
Detailed description of the invention
Below in conjunction with accompanying drawing, structural principle of the present invention and operating principle are described in detail:
See Fig. 3, Fig. 4, the present invention discloses the overall folding method of a kind of self-elevating drilling platform cantilever beam, for semi girder 200 and main hull 100 being closed up.
As shown in Figure 3, the precalculated position on the deck 110 of described main hull 100 is provided with support point 111 for supporting described semi girder 200 and for fixing described semi girder 200 end concentrate on work at selected units 112, described main hull 100 is configured with main hull ballasting system, and the overall folding method of described self-elevating drilling platform cantilever beam comprises:
Steps A, provides a barge 300, and described barge 300 is configured with barge ballasting system, preliminary to described barge 300 and described main hull 100 contraposition is located;
Step B, by described semi girder 200 from slipway launching to described barge 300;
Step C, locates described main hull and described barge exactitude position;
Step D, semi girder 200 described in slippage to the precalculated position of described main hull 100 completes described semi girder 200 to close up with described main hull 100, wherein, in slipping, also progressively adjust the floading condition of described main hull 100 and described barge 300, to guarantee that described semi girder 200 accurately slides onto on the precalculated position of described main hull 100.
Further,
The detailed description of the invention of the overall folding method of self-elevating drilling platform cantilever beam provided by the invention is disclosed see Fig. 3 to Fig. 7
complete the overall package of semi girder
First complete the overall package of described semi girder 200, comprise derrick 200b, rig floor 200a, and drilling equipment etc., then carry out entirety with described main hull 100 and close up.
See Fig. 7, described main hull 100, is preset with in described semi girder 200 in drillng operation, for supporting the support point 111 of described semi girder 200 and concentrating on work at selected units 112 with the end of fixing described semi girder 200.Support point 111 is not limited to the stern being arranged on described main hull 100, and can also concentrate on work at selected units between 112 and arranges multiple support point 111 in stern.Described main hull 100 is also provided with towage position 113, that is, the bow of described semi girder 200 and described main hull 100 complete the final position that entirety is closed up.
by semi girder from slipway launching to barge, complete docking of barge and main hull
Position after preliminary to described barge 300 and described main hull 100 contraposition (described barge 300 docks with described main hull 100) see Fig. 5.
Specifically, preliminary contraposition refers to, by the center of described barge 300 and the center contraposition of described main hull 100; Various ways can be selected in the location of described barge 300, such as, go to dock in side, platform or marine positioning etc., the scheme that the present invention goes to dock for side, as shown in Figure 5, the other scheme gone to dock of the present invention is the mode adopting mooring, specifically, by arranging the first anchoring system 500 in described harbour 400 with the side 300a of described barge, positioned other for described barge 300 by described harbour 400 by the mooring cable of the first anchoring system 500, preferably, on harbour wall or barge wall is arranged the fender 700 of anticollision.
By described semi girder 200 from the slipway launching of harbour 400 to described barge 300.And then by described barge 300 and described main hull 100 exactitude position.
After described barge stability, by other for described main hull 100 by described barge 300, main hull 100 side of the present invention also adopts the mode by mooring by described barge 300, namely, by arranging the second anchoring system 600 in the opposite side 300b of described barge and the side of described main hull 100, positioned other for described main hull 100 by described barge 300 by the mooring cable of the second anchoring system 600, preferably, also bumper 800 is set on the ship wall of described main hull 100 or on the ship wall of described barge 300.
By adjusting the barge ballasting system of configuration on described barge 300, thus reaching the adjustment drinking water of barge 300 and the object of floading condition, ensureing that the bottom plate heights of described semi girder is consistent with the height of the support point 111 that the stern of described main hull 100 is arranged; By adjusting mooring cable or the winch of the second anchoring system 600, completing described barge 300 and the exactitude position of described main hull 100 left and right directions, ensureing the center of described semi girder 200 and the center exactitude position of described main hull 100.
See Fig. 5 a, because described semi girder sliding rail 301 can not be set to the end of described barge 300, that is, a space D is formed between the end of described semi girder sliding rail 301 and the end of described barge 300, marine in order to prevent slippage roller 201 from falling to, the present invention is welded with the stake 302 of slippage roller gear in D place, this space, further, the structure of described slippage roller gear stake 302 is as shown in Fig. 6 a, Fig. 6 b.
semi girder positioning sliding
The slippage of described semi girder 200 has various ways, can select to refute with load out and launch a ship (Sliding Structures thing from the bank to floating barge) slip mode similar, such as, thrusting slip or winch traction slippage, the present invention draws slippage to select winch.
First, lay semi girder sliding rail 301, in order to reduce friction, present invention employs slippage roller 201 as shown in fig. 4 a, slippage roller 201 is arranged on the bottom of described semi girder 200, match, described semi girder sliding rail 301 is also provided with roller track, because roller track frictional force is little, therefore more slippage is conducive to, like this, semi girder sliding rail 301 can play the beam action of load-bearing cantilever on the one hand, and the little slippage of roller track frictional force is more smooth on the other hand.
Secondly, select slip mode and power unit, the present invention adopts the form of winch and assembly pulley to carry out slippage, is fixed on by fixed pulley on described main hull 100, and movable pulley is fixed on described semi girder 200, and wherein winch is fixed on described barge 300.By driven by power winch, wire rope regained by winch, and the distance between fixed pulley and movable pulley reduces, thus described semi girder 200 starts to move ahead.
The form that the invention is not restricted to above-mentioned winch and assembly pulley carries out slippage, can also select described barge 300 being arranged the pushing tow system being used for the slippage on described semi girder sliding rail 301 of semi girder 200 described in pushing tow, to realize the slippage of described semi girder 200.
The leading portion that semi girder 200 described in slippage proceeds to described semi girder 200 sequentially passes through described support point 111 and describedly concentrates on work at selected units 112.
The described main hull 100 caused to make up tide changes with the relative position of described semi girder 200, need the ballasting system of certain proportioning to ensure relative position, the ballasting system of described certain proportioning refers to, the ballast water weight needed for described main hull and barge is calculated according to the parameter such as volume, weight of semi girder 200 in actual job, and the submersible pump of configuration needed for drawing according to conditions such as unloading times or marine pump, otherwise, ballasting system scarce capacity, can not meet described semi girder 200 and slide onto on described main hull.Illustrate, such as, if main hull stern is by discharge 1040 tons of ballast waters, unloading time estimates 3 hours, then need ballast total amount 350m
3/ hour drainability, and then submersible pump or the marine pump of the required configuration of main hull can be determined.
In slipping, according to the progressively adjustment to the ballasting system of required proportioning, that is, constantly discharge the ballast water of described main hull 100 and the ballast water of described barge 300 according to calculating, guarantee that slippage is smooth at any time.
The present invention progressively regulates described main hull 100 with the embodiment of the floading condition of described barge 300 to be:
Slipping is arranged multiple adjusting stage by precomputation, in each adjusting stage, first slippage is stopped, then calculation value according to expectation adjusts described main hull ballasting system and barge ballasting system, a predetermined value is kept respectively to make the draft amount of described main hull 100 and described barge 300, and described barge 300 can keep level, namely, progressively regulate the floading condition of barge 300, guaranteeing in semi girder 200 slipping, not causing because of barge 300 run-off the straight the leading portion of semi girder 200 cannot smoothly by concentrating on work at selected units 112.
Certainly; progressively regulate described main hull 100 and the floading condition of described barge 300, also can select the scheme not stopping slippage, that is; constantly discharge the ballast water of described main hull 100 and the ballast water of described barge 300 at any time in slipping, guarantee that slippage is smooth at any time.
transfer part semi girder load
Continuing semi girder 200 described in slippage, in slipping, continuing, according to calculating the ballast water of constantly discharging described main hull 100 stern, to realize the slow transfer of described semi girder 200 load.Adjust the ballast water of described barge 300 simultaneously, ensure the level of described barge 300, now semi girder does not depart from semi girder sliding rail 301 completely.
Stern to semi girder 200 can also detect described semi girder 200 when not exclusively departing from semi girder sliding rail 301, specifically, described semi girder 200 in described refute remain on board skidding distance S about 5 to 3.5 meters time stop slippage, the position of described semi girder 200 is detected and is fixed.
shift semi girder load completely
Suspend slippage, continue to get rid of ballast water in main hull 100, barge 300 carries out ballast, until semi girder 200 departs from barge 300 completely in the side near main hull 100 simultaneously.
semi girder slides onto subscribes position
Continue slippage semi girder 200 to precalculated position, that is, towage position 113, and in slipping, adjust the floading condition of main hull 100, ensure that semi girder 200 is under unpowered effect, slippage does not occur.So far semi girder 200 and main hull close up complete.
See Fig. 8 a to Fig. 8 f and with reference to above-mentioned Fig. 3 to Fig. 7, disclose the specific embodiment of the overall folding method of self-elevating drilling platform cantilever beam provided by the invention further
First complete the overall package of required semi girder 200, and estimate the ballast water numerical value in each stage to the slippage of required semi girder 200 of calculating, complete through the following steps and carry out entirety with main hull 100 and close up.
Steps A, by the preliminary contraposition in center at the center and main hull 100 that are configured with the barge 300 of barge ballasting system, then by the first anchoring system 500 by other for barge 300 400 location of going to dock, now, barge 300 and main hull 100 all belong to floating state, main hull 100, because not carrying semi girder, needs in afterbody loading in order to avoid larger trim by head;
Steps A 1, lays semi girder sliding rail 301 on barge 300;
Steps A 2, arranges slippage roller 201 in the bottom of semi girder 200;
Steps A 3, arranges fixed pulley on main hull 100, on semi girder 200, arrange movable pulley, arranges the wire rope of electric winch and connection electric winch and fixed pulley and movable pulley on barge 300;
Steps A 4, the D place, space formed between the end of semi girder sliding rail 301 and the end of barge 100 arranges roller and keeps off stake 302;
Step B, by semi girder 200 from slipway launching to the semi girder sliding rail 301 of barge 300;
Step C, regulate the floading condition of barge 300 by barge ballasting system or regulate the floading condition of main hull 100 to make the bottom surface of the semi girder 200 be positioned on main hull 100 consistent with the height of support point 111 by main hull ballasting system, thus completing barge 300 and the exactitude position of main hull 100 on upper-lower position; The center of semi girder 200 and the center contraposition of main hull 100 is adjusted by the second anchoring system 600, thus complete main hull 100 and the exactitude position on the right position of barge 300, be in line with the center at the center and semi girder 200 that ensure main hull 100, then, by the second anchoring system by other for main hull 100 by barge 300 location that interfixes;
Step D1, starts shown in slippage semi girder 200(Fig. 8 a), now, the tilt angle of barge 300 is about 0.47 degree (that is, the semi girder sliding rail 301 of barge 300 is a little more than support point 111);
Step D2, continues shown in slippage semi girder 200(Fig. 8 b), slippage 14.5 meters, stops slippage, the interior ballast water of adjustment (eliminating) barge 300 of calculation value according to expectation and main hull 100, and make main hull 100 keep drinking water 4 meters, barge 300 keeps drinking water 5.883 meters;
Step D3, continue slippage semi girder 200 about 2.5 meters (shown in Fig. 8 c), stop slippage, the interior ballast water of the adjustment of calculation value according to expectation (eliminating) barge, keep level so that semi girder 200 can smoothly by concentrating on work at selected units 112 to make described barge, 112 are concentrate on work at selected units if can not pass through, also need again the floading condition of suitable adjustment barge 300, now the overall weight of semi girder 200 is still on barge 300, but by semi girder 200, main hull 100 and barge 300 is connected into a larger barge;
Step D4, continue semi girder 200 slippage 10 meters (shown in Fig. 8 d) again, the center of gravity of semi girder 200 has moved on main hull 100, calculation value according to expectation continues the ballast water of the stern of discharging main hull 100, main hull 100 is made to keep drinking water 4 meters, adjust the ballast water of barge 300, ensure that barge 300 level and barge 300 keep drinking water 5.883 meters, now semi girder 200 does not depart from semi girder sliding rail 301 completely simultaneously;
Step D5, continues shown in slippage semi girder 200(Fig. 8 e), semi girder 200 remains when skidding distance S is about 3.5 meters and stops slippage on barge 300, detects and fix the position of semi girder 200;
Step D6, continue shown in slippage semi girder 200(Fig. 8 f), confirm that semi girder 200 departs from semi girder sliding rail 301, continue on slippage semi girder 200 to towage position 113, continue the floading condition of adjustment main hull 100, ensure that semi girder 200 is under unpowered effect, slippage does not occur, complete described semi girder 200 to close up with described main hull 100, the final drinking water that the present embodiment closes up rear main hull 100 is approximately 3.5 meters.
Figure 9 shows that rig floor 200a, derrick 200b and drilling equipment etc. are assembled in semi girder 200 and carry out after entirety closes up with main hull 100, semi girder 200 moves to drilling well region with main hull, in drillng operation, when semi girder 200 presents extension state its support point 111 and concentrate on work at selected units 112 stressed schematic diagram.
As shown in Figure 9, semi girder 200 is in drillng operation state, and support point 111: the key area or the structural member that are mainly used for support cantilever beam weight and load, support point 111 is mainly by downward load, and compressive stress is main.
Concentrate on work at selected units 112: the end being mainly used for cantilever mounted beam, 112 load being mainly subject to upwards of concentrating on work at selected units, tensile stress is main.
To sum up embodiment, the overall folding method of the self-elevating drilling platform cantilever beam that the present invention discloses, be first slippage semi girder on barge, this launching barge has more sufficient ballasting system, and does not have required precision in lower water process.Docking again by barge and main hull, offset the impact of tide, even if there is irrational fault (slip device disabler etc.) in slipping, but without the need to considering the impact of tide, regulate the outflow sufficient time for semi girder closes up accurately location and ballast, ensure the safety of slipping.
In slipping, constantly regulate the ballast of barge and main hull, ensure that in slipping, semi girder deadweight is constantly slowly transferred on main hull from barge.
For this reason, the overall folding method of self-elevating drilling platform cantilever beam that the present invention discloses has the following advantages:
1, tidal effect is offset,
The overall folding method of self-elevating drilling platform cantilever beam provided by the invention, closes up complicated and that precision is higher semi girder and is divided into two stages: 1) semi girder entirety is refuted launch a ship (load out), 2) semi girder is floating closes up.Wherein the first stage is the lower water mode on common meaning, and does not have required precision, and its risk is lower.Second stage, is that two floating things dock, then carries out semi girder slippage operation, counteract the impact of tide on water level.
2, sliding period is reduced
Compare existing technique pitching pile sliding method, save the process of semi girder pitching pile, pre-ballast, drainage ballast water, jack-up unit standing process (ballast water is let out in pitching pile precompressed placing) is even if on the completely perfect basis of system, also need the operating time connect in a couple of days.The overall folding method of self-elevating drilling platform cantilever beam provided by the invention, only needs two barges to dock, without the need to standing operation.
3, slippage risk is reduced
In slipping, also need constantly to carry out ballast water adjustment, different from existing hoisting, adjust in the process of carrying at this, along with the adjustment of ballast water, the weight of semi girder little by little will be transferred on main hull by barge.And there will not be unexpected transfer or lifting to lose the risk of hook.
4, precision is closed up high
As there is horizontal-shift or vertical deviation in slipping, being realized the adjustment of left and right skew by the tensioning of the left and right winch of anchoring system, by regulating the floading condition of barge to be easy to the deviation realizing short transverse, thus ensureing the precision of closing up.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (11)
1. the overall folding method of self-elevating drilling platform cantilever beam, for semi girder and main hull are closed up, wherein, described main hull is preset with towage position, and described semi girder is in drillng operation, for supporting the support point of described semi girder and concentrating on work at selected units for fixing described semi girder end, described main hull is also configured with the main hull ballasting system of preset blending ratio, it is characterized in that, the overall folding method of described self-elevating drilling platform cantilever beam comprises step:
A, provides a barge, described barge is configured with the barge ballasting system of preset blending ratio, described barge and the preliminary contraposition of described main hull is located;
B, by described semi girder from slipway launching to described barge;
C, locates described main hull and described barge exactitude position;
D, semi girder described in slippage, on the towage position of described main hull, completes described semi girder and described main hull closes up, and wherein, also comprises: in slipping, progressively adjusts the floading condition of described main hull and described barge.
2. the overall folding method of self-elevating drilling platform cantilever beam according to claim 1, it is characterized in that, described barge in described steps A and the preliminary contraposition of described main hull be for, by moving left and right described barge and by the center contraposition of the center of described barge and described main hull, the location of described barge be for, adopt the first anchoring system to go to dock other for described barge.
3. the overall folding method of self-elevating drilling platform cantilever beam according to claim 1, it is characterized in that, described barge in described step C and described main hull exactitude position comprise: described barge and the exactitude position of described main hull on upper-lower position and right position, the location of described main hull be for, adopt the second anchoring system by other for described main hull by described barge.
4. the overall folding method of self-elevating drilling platform cantilever beam according to claim 3, it is characterized in that, described barge and the exactitude position of described main hull on upper-lower position be for, regulate the floading condition of described barge by barge ballasting system or regulate the floading condition of described main hull to make the bottom surface of the described semi girder be positioned on main hull consistent with the height of described support point by described main hull ballasting system; Described barge and the exactitude position of described main hull on right position be for, adjust the center of described semi girder and the center contraposition of described main hull by described second anchoring system.
5. the overall folding method of self-elevating drilling platform cantilever beam according to claim 1, it is characterized in that, the slippage in described step D is track slippage, wherein, before described step B, also comprise steps A 1, on described barge, lay semi girder sliding rail; Steps A 2, arranges slippage roller in the bottom surface of described semi girder.
6. the overall folding method of self-elevating drilling platform cantilever beam according to claim 5, it is characterized in that, steps A 3 is also comprised after described steps A 2, on described main hull, fixed pulley is set, movable pulley is set on described semi girder, electric winch is set on described barge and connects the wire rope of described electric winch and described fixed pulley and movable pulley.
7. the overall folding method of self-elevating drilling platform cantilever beam according to claim 5, it is characterized in that, after described steps A 2, also comprise steps A 3, the pushing tow system for the slippage on described semi girder sliding rail of semi girder described in pushing tow is set on described barge.
8. the overall folding method of the self-elevating drilling platform cantilever beam according to claim 1 to 7 any one, is characterized in that, be also provided with fender or bumper between described barge and harbour, between described barge and described main hull.
9. the overall folding method of the self-elevating drilling platform cantilever beam according to claim 6 or 7, it is characterized in that, the gap formed between the end of described semi girder sliding rail and the end of described barge is also provided with roller and keeps off stake.
10. the overall folding method of self-elevating drilling platform cantilever beam according to claim 8, it is characterized in that, the floading condition progressively adjusting described main hull and described barge in described step D be for, slipping is arranged multiple adjusting stage by precomputation, in each adjusting stage, first slippage is stopped, then calculation value according to expectation adjusts described main hull ballasting system and barge ballasting system, to make the draft amount of described main hull and described barge keep a predetermined value respectively, and described barge keeps level.
The overall folding method of 11. self-elevating drilling platform cantilever beam according to claim 9, it is characterized in that, also detecting step is comprised in described step D, in slipping, described semi girder stops slippage in described refuting when remain on board skidding distance is 5 to 3.5 meters, detects and fix the position of described semi girder.
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| CN104420453B (en) | 2016-06-01 |
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