CN1043132C - Energy absorbing device for offshore deck installation - Google Patents

Abstract

A device is used to absorb energy when the deck is installed on the offshore understructure, wherein, a tube shaped body provides annular pleat rings which are formed between the two ends of tube shaped body. The inter-nodal distance among the pleat rings is inequal, so that continuous puckers can be provided and the energy can be absorbed through the pleat rings.

Description

Be used for the energy absorbing device that offshore deck is installed

The present invention relates generally to the installation of offshore plant, relates to a kind of endergonic device that is used for when being installed to the deck on the understructure or rather.

In offshore production industry, one of two main members are exactly platform.A understructure that is commonly called jacket is extended short range of the water surface from mud line.Jacket is positioned on the piling bar of squeezing into the seabed.The superstructure that is commonly called the deck is installed on the jacket.The required equipment of platform expectation function of finishing is equipped with and supporting on the deck.

Jacket and deck are to produce on the coast and install on the coastal waters with the form of separative element.The deck can be a single-piece or modular.The integral type deck forms to three masters with directly being contained in one on the jacket packaged joining.The assembly type deck is that more all assembled blocks assemble, and these assembled blocks are contained on the assembling bracing frame, and the assembling bracing frame must be located on jacket earlier.The predetermined area is transported to by one or more transportation pontoon in the deck, and one or two hoisting crane that is installed in usually on the specific mounting shipping that is called tower derrick barge installs on jacket or the assembling bracing frame.The deck is divided into polylith can be reduced and must can reduce the required power of tower derrick barge thus with the weight that weighs most a deck of tower derrick barge lifting.Yet, be between all deck pieces, to carry out necessary connection in the work that must do on the coastal waters.This work is called as hook.Therefore, must average out between the cost of cost of linking up with and tower derrick barge, the former can reduce by the quantity that reduces the deck piece, and the latter then increases (seldom having several is heavier piece) along with the increase of lifting weight.

Cost shows more usually, preferably under the situation of the tower derrick barge that uses existing maximum power the deck number of blocks is reduced to minimum.This is particularly suitable for those and is easy to occur windy zone, and owing to the time that the polylith deck is needed to spend than long lays and links up with, and long deck installation can make the danger of suffering a loss increase in these zones.Correspondingly, the maximum of tower derrick barge lifting weight has been increased to 10,000 to 12,000 tons scope.But the total weight on some mounted assembly type deck surpasses 40,000 tons, so even with the tower derrick barge of existing maximum power, deck that also must will be bigger is cut apart so that lift again.

Under little situation, the operation by not adopting the lifting of tower derrick barge is 15,000-30, and install with the form of monomer on the deck in 000 ton of scope.Utilize the sled operation that the deck is installed on the transportation pontoon.In addition, also can join at the enterprising luggage of transportation pontoon, the installation on deck is by ballasting transportation pontoon to be realized downwards till the parts on the deck plane are in load-carrying element.This ballasting process was once carried out in the hydrostatic of Norway fyord and was carried out once in the hydrostatic in bay, Scotland.Because the wavy relation of offshore place, and the motion that makes the relative jacket of transportation pontoon produce the induction ocean current.When motion barge by ballasting and downwards the time, contact jacket at first on the deck and finally make the deck from needing to spend the time of a few minutes between transportation pontoon leaves.During this period, owing to the barge motion constantly bumps against on the jacket deck, this can cause deck, jacket and transportation pontoon obviously to be damaged.

In order to use the ballasting technology off shore, can adopt two-step method.

1, as quickly as possible downwards ballasting so that contact the deck on the jacket at first and finally reduce to the shortest from the time that is spent between transportation pontoon leaves.Can reduce the deck like this contacts jacket and breaks away from the number of times of jacket owing to the transportation pontoon motion makes the deck.Desired quick ballasting technology is not a theme of the present invention.

2, each the contact point place setting between deck and jacket can endergonic shock absorber.These energy absorbing devices are designed to have suitable power-distortion and energy absorbing-deformation relationship.Energy absorbing device is a subject of this patent application.

Can under specific situation, use energy absorbing device to reduce the cost that the deck is installed with tower derrick barge.In some work area, tower derrick barge usually must perform the preparation that changes with weather before the deck is mentioned.Wave can cause between tower derrick barge and the jacket and produce relative motion, and if relative motion excessive, thereby then the deck can rigid falling cause it impaired on the jacket.If the use energy absorbing device then not only can be under the general situation but also can settle first to pull under inclement weather, this makes tower derrick barge only need seldom setup time.Because concerning tower derrick barge, the expense between the standby period is quite high, so can be by shortening setup time reduction expense behind the use energy absorbing device.

US Patent 4,252,468 and 4,252,469 disclose a kind of method and apparatus that adopts ballasting technology coastal waters that the deck is installed.Adopt the accordion structure of customized design below each strong point that the deck is supported on the transportation pontoon.After the deck contacted jacket, these structures stacked simultaneously, formed enough gaps between deck and the barge immediately and prevented to cause producing between barge and the deck any further contact because of barge motion thereby make.

US Patent 4,531,619 disclose a kind of collapsible steering column that is used for passenger vehicle, this Steering gear has adopted at least two elongated bellows parts, each bellows is partly with a tubular support part of joining with it, and wherein another matches with a bellows and tubular support partial design Cheng Nengyu.

The present invention satisfies above-mentioned needs in simple mode.

The invention provides a kind of energy absorbing device that uses when off shore one deck section being installed, wherein, one tubular bodies is placed in and makes it to be on deck or the understructure between each contact point of the two, tubular bodies can be placed in deck or the understructure on the either party, each tubular bodies all has the ring fold circle between the tubular bodies two ends are separated by.

And preferably, these ring fold circles be in the axial direction collimation and have unequal pitch, and can make tubular bodies with steel.

Fig. 1 is a fragmentary, perspective view of the present invention.

Fig. 2 is a cutaway view of the present invention.

Fig. 3 is the section-drawing of the present invention after it finishes the energy absorbing function.

Fig. 4 is the diagram of curves of the explanation application of force-deformation relationship of the present invention.

Fig. 5 is the diagram of curves of explanation energy absorbing-deformation relationship of the present invention.

With reference to accompanying drawing, can see that from Fig. 1 and 2 the present invention represents with 10 with mark.Energy absorbing device 10 is made of the tubular bodies 12 that has one or more circular folded rings 14 usually.

As what can see from the fragmentary, perspective view of Fig. 1, energy absorbing device 10 links to each other with part supporting construction on the deck to be installed.Spud leg 16 extends downwards from unshowned deck, and the truss 18 that is contained on the spud leg 16 is used for support deck.The flange 20 of spud leg 16 inboards is welded on the upper end of energy absorbing device 10.Only show a spud leg 16 for convenience of explanation in the drawings.Yet, on the deck of coastal waters installation, be provided with a plurality of spud legs 16 or the strong point obviously.In order to absorb energy during the deck is installed, used energy absorbing device should adapt with the quantity of spud leg 16.

As Fig. 2 clearly represented, tubular bodies 12 was hollow and has upper end 22 and lower end 24.Between the two ends 22,24 of tubular bodies 12, form one or more circular folded rings 14.In this most preferred embodiment, be provided with two circular folded rings 14.Can also preferably make the pitch of the pleat circle of representing with L1 and L2 among Fig. 2 14 unequal.Can provide continuous and energy absorbing gradually by pleat circle 14 like this.Because the deck of installing in the coastal waters nearly weighs 10,000-40,000 ton, thus the most handy metal for example steel make energy absorbing device 10.

In Fig. 1, the lower end of shown energy absorbing device 10 is connected with second tubular piece 26 of passing spud leg 16 or is integral.Second tubular piece 26 has an osed top bottom 28 so that can form stable support when dropping on the understructure on the deck, and the surface of understructure is represented with label 30 in Fig. 2 and Fig. 3 usually.As from seeing the figure, a movable bonded assembly pin 32 can be set on bottom 28, it can compensate any abnormal initial contact that occurs between second tubular piece 26 and the surface 30.

In operation, the deck is mentioned from its transportation pontoon, moves to the top of understructure with hoisting crane, and above the surface 30 of understructure the location so that the lower end of each spud leg 16 all is in the top of presumptive area on the surface 30.Hoisting crane drops to the total weight that makes the deck with the deck and all transfers on the surface 30 of understructure then.As shown in Figures 2 and 3, pleat circle 14 will form that self is folding when absorbing energy with device 10 and in the weight transfer process.Energy is absorbed gradually rather than under the situation that deck and understructure are damaged, is absorbed.Device 10 effective length diminishes in this process, makes the lower end band of each spud leg 16 flange of establishing thereon 34 that radially extends thus and contacts with surface 30 in the energy absorbing process.A kind of thickness of steel plate wall is 2.25 inches, it is 42 inches with the recess overall diameter that the protruding place overall diameter of pleat circle 14 is 54 inches, and the pitch of top pleat circle is 26 inches, and the pitch of bottom pleat circle is that the Design Mode of 28 inches device 10 will produce such characteristic numeral, wherein KIP equals 1,000 pound.The load yield point is about 6,300KIP ' S.The plastic strain that absorb can be about 13,000ft-KIP ' S.Load on the compression end is about 4,800KIP ' S.Rise and fall highly is that length variations is about 33 inches.(falling head is that flange 34 can be fallen on the surface 30 after 33 inches).

The characteristic curve of Fig. 4 indication device 10 under above-mentioned Design Mode.Point A represents that top pleat circle begins surrender and install 10 to begin to occur longitudinal travel.Point B represents the value of top pleat circle (having less pitch) when self closes.Point C represents to close the top pleat circle that holds together and begins value when bottom pleat circle moves.Value when point D represents that top pleat circle and bottom pleat circle meet.Value when the pleat circle began to surrender bottom some E represented.Value when the pleat trap was held together bottom some F represented.Fig. 5 is the diagram of curves that concerns between indication device 10 uniform and energy absorbing gradually and its distortion.This curve shows that also device 10 has stored a spot of energy.

Owing in notion of the present invention institute restricted portion, can make many modification and different embodiments, and because technical description regulation can be made a lot of improvement to the details of embodiment, so be appreciated that the details at this is not the meaning with any qualification for indicative explaination only.

Claims (6)

1, a kind ofly is used for endergonic device on the understructure that the deck is installed to offshore place the time, it comprises tubular bodies, on said tubular bodies, be formed with circular folded ring, it is characterized in that, said tubular bodies is one, and said circular folded ring be positioned at the two ends of said tubular bodies with.

2, device as claimed in claim 1 wherein is provided with two circular folded rings, has between said circular folded ring and the said tubular bodies two ends at interval.

3, device as claimed in claim 2, wherein the pitch of pleat circle is unequal.

4, device as claimed in claim 1, wherein said tubular bodies is made with steel.

5, a kind ofly be used for endergonic device on the understructure that the deck is installed to offshore place the time, comprise the tubular bodies that has circular folded ring, it is characterized in that, comprising:

A, said tubular bodies are one; With

B, the said circular folded ring that is formed on the tubular bodies are two, and said circular folded ring has unequal pitch.

6, device as claimed in claim 5, wherein said tubular bodies is made of steel.

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