CN110468816B - Sliding type installation method and system of offshore electrical platform - Google Patents
Sliding type installation method and system of offshore electrical platform Download PDFInfo
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- CN110468816B CN110468816B CN201910614897.XA CN201910614897A CN110468816B CN 110468816 B CN110468816 B CN 110468816B CN 201910614897 A CN201910614897 A CN 201910614897A CN 110468816 B CN110468816 B CN 110468816B
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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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- 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
- E02B2017/0039—Methods for placing the offshore structure
- E02B2017/0043—Placing the offshore structure on a pre-installed foundation structure
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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
- E02B2017/0039—Methods for placing the offshore structure
- E02B2017/0047—Methods for placing the offshore structure using a barge
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Abstract
The invention belongs to the field of ocean engineering, particularly relates to the field of offshore wind power development, and particularly relates to a sliding type installation method and system of an offshore electrical platform. The method has the following beneficial effects: 1) the method has the advantages that the method is wide in application range, can be used for mounting ultra-shallow water depth and ultra-large ocean platforms, has low restrictive requirements on transportation barges, upper blocks and lower blocks besides the necessary bearing capacity requirements of the supporting structure, does not need to change the classical structural style and the arrangement scheme of the platforms, widens the selection range of engineering optimization, and can effectively control the construction period and the engineering quantity. 2) The butt joint of the upper block and the lower block of the offshore platform can be stably, accurately and controllably operated by means of the rail and the SPMT vehicle set, the collision and inclination problems possibly occurring in a hoisting method or a floating-supporting method are avoided, and a butt joint buffer device at the connection position of the pile is not required to be arranged. 3) Each step is convenient to construct, the operation is simple, and the engineering economic benefit is remarkable.
Description
Technical Field
The invention belongs to the field of ocean engineering, particularly relates to the field of offshore wind power development, and particularly relates to a sliding type installation method and system of an offshore electrical platform.
Background
With the continuous deepening of ocean development, more and more offshore platforms are put into use. In most engineering projects, the installation process of the platform is one of the decisive factors for determining the engineering economy, and has an important influence on the structural formula. The conventional installation method of the offshore platform is to use a floating crane transportation barge to hoist and place the upper block on a lower foundation structure (such as a jacket, a high pile cap and the like) which is constructed in advance, the related technology is mature, but the application of the hoisting method has the following limitations:
1) the large floating crane transportation barge has large draught and bottom contact risk under the condition of small water depth, and cannot be applied to offshore platform installation of a mudflat or an extremely shallow water depth sea area;
2) at present, the maximum hoisting weight of most floating crane transportation barges in the world is not more than 1 ten thousand tons, and the hoisting safety requirements of ultra-large oil and gas platforms, offshore converter stations and other ocean platforms of more than ten thousand tons cannot be met;
3) the current requirements of floating crane resources and window periods on projects to be built are very pretty, and the requirements of construction period and economy of large-scale ocean development cannot be met.
The above limitations are particularly evident in the field of offshore wind power development. At the present stage, the subsidy grade-withdrawing trend of offshore wind farm development is more and more obvious, and the related engineering technology is pushed down to accelerate the upgrading and updating steps. If a hoisting scheme must be adopted, part of the development project loses economy. In the aspect of installation technology of the offshore electric platform: under the condition of 1), the prior art can adopt the structural style of a split modular offshore booster station (patent publication No. CN 204126320U), and applies floating crane resources with smaller hoisting capacity but lower draft requirement, but the technology can not solve the problem that the station site is positioned in the condition of ultra-shallow water depth or mudflat, and the split structure is not equal to an integral structure in the aspects of bearing performance and construction process; under the condition of 2), the prior art adopts a floating method (patent publication No. CN 109056684A) to install, but barge resources capable of carrying out floating installation are also limited, and the related art has special requirements on slotting of a foundation support and collision buffering in the connection process of an upper block and a lower block, and the project design period and the project quantity are higher than those of a hoisting scheme.
Disclosure of Invention
The technical problem to be solved by the invention is as follows:
offshore platforms, in particular offshore electrical platforms, are in many cases not suitable to be installed by means of hoisting. The existing alternative technology has many other limited requirements, such as forced weakening of structural style, large-scale and special engineering transportation barge selection, no over-deep or over-shallow water depth condition, etc. Therefore, it is urgently needed to provide a safe, convenient and efficient sliding type installation method for an offshore electrical platform, which can meet the structural bearing performance of the upper and lower chunks in the whole processes of shipment, transportation, installation and in-service, and meanwhile, does not force the shape, arrangement and type of the chunks to have significant differences from the existing mature scheme, i.e., the workload and the engineering quantity are not additionally increased, and the limit on the water depth of optional engineering transportation barges and sites is relaxed, so that the feasibility and the economical efficiency of engineering are guaranteed.
For this reason, the above object of the present invention is achieved by the following technical solutions:
a method of skid steer installation of an offshore electrical platform, comprising: after an upper module of the offshore electrical platform is built on a building site, a double-layer supporting truss is arranged on the lower portion of the offshore electrical platform for temporary supporting, an SPMT (moving plate transport) train set is arranged below the truss and is supported on a sliding rail of the building site, and a rail and a supporting frame with the same width are arranged on a transport barge; the upper module and the double-layer support truss of the offshore electric platform are glidingly loaded by an SPMT (fixed platform management machine) train set and then are transported to a construction site of the offshore electric platform by a barge;
the fixed foundation at the lower part of the offshore electric platform is pre-installed, and a track matched with a construction site and a transportation barge is arranged in the upper horizontal plane of the offshore electric platform; the upper block and the double-layer supporting truss of the offshore electrical platform are still supported by the SPMT vehicle group and are slid to a preset position on the lower block of the offshore electrical platform by the transportation barge, so that the horizontal position of the main connecting column of the upper block is aligned with the pile top of the lower block; the hydraulic jacking device of the SPMT car group is in a high position in the process of sliding on the platform, a certain gap is reserved between the lower surface of the main connecting column of the upper chunk and the pile top of the lower chunk, the hydraulic jacking device of the SPMT car group falls after the position is in place, so that the surfaces of the piles and the columns are stably butted, the connection position of the piles and the columns is welded on site, finally, the hydraulic device of the SPMT car group is adjusted to the lowest position, and the SPMT car group and the double-layer supporting truss are retracted to the transport barge along a rail.
The invention can adopt or combine the following technical scheme while adopting the technical scheme:
as a preferred technical solution of the present invention, the dimensions and topology of the double-layered support truss are determined by the following conditions:
(1) the edge width is 2m less than the distance between the inner side edges of the main column connecting plates of the upper module, namely, 1m of gaps are reserved between the outer edges of the two sides of the double-layer support truss and the main axis of the pile-column in the sliding and landing process;
(2) the hydraulic support distance of the SPMT vehicle group is two times larger than the distance of the main axis of the pile-column in the direction, namely the hydraulic support positions of the first row of trolleys and the last row of trolleys are ensured to be consistent with the position of the vertical stay bar of the double-layer support truss;
(3) except the edge frame nodes in the width direction, the horizontal position of the main node corresponds to the beam column, beam brace node and other strong structures of the upper block deck, and a stiffening rib is arranged between the upper flange plate and the lower flange plate of the upper block deck girder at the edge frame support;
(4) a skid is arranged between the upper module and a layer of node of the double-layer support truss, triangular steps are arranged on two sides of the skid, the lower surfaces of the triangular steps are welded with the double-layer support truss, and the upper surfaces of the triangular steps and the lower surface of a layer of deck beam of the upper module are spot-welded;
(5) height of double-layer supporting trussH bf I.e., the distance between the upper surface and the lower surface, is determined by the following equation:
H bf = E t1 – E j1 – H tb1 – H w – H 10
in the formula:E t1the top elevation of the deck beam of the upper module is the top elevation,E j1is the top level elevation of the lower block,H tb1 the height of the deck main beam of the upper module block layer,H w is the height of the skid, and is,H 10and (4) lifting the hydraulic device of the train set to a height of 10cm, and then, the distance from the bottom surface of the train to the lower surface of the support truss.
As a preferred technical scheme of the invention, the SPMT vehicle group is a self-propelled hydraulic flat vehicle group, and a single flat vehicle consists of a front hydraulic device, a rear hydraulic device and a tray above the front hydraulic device and the rear hydraulic device; the number of train sets is determined according to the number of tracks of a construction site, a barge and a lower chunk, and a group of flatbeds connected end to end is defined as a train; the positions of the front hydraulic device and the rear hydraulic device of each row of the platform lorry at the head and the tail correspond to the positions of the nodes of the supporting truss, the train sets are uniformly and symmetrically arranged along the row direction, and each platform lorry on the same row is fixedly connected through a tray to form a whole; the jacking stroke of a hydraulic device of the vehicle set is not less than 50 cm; in the process of sliding on the platform, the hydraulic device can automatically compensate due to uneven reference surface or movement of the transportation barge, but the jacking height of each device is not less than 35cm before falling and docking; after the butt joint is finished, the jacking height of each device is not less than 10cm, and when the train set and the supporting truss are withdrawn, the gap between the upper surface of the train set and the upper chunk is not less than 10 cm.
As a preferred technical solution of the present invention, the transportation barge is provided with a rail support platform on the deck thereof in advance before loading the upper block and the double-deck support truss; after the upper module and the double-layer supporting truss are in place, installing a tripod type temporary binding member at the edge frame node in the width direction, welding the lower surface of the temporary binding member with the main deck, and performing spot welding on the upper surface of the temporary binding member and the edge frame node; meanwhile, a tubular temporary binding component is arranged on a main node on the main axis of the pile-column layer of the upper module at the two sides of the double-layer supporting truss with the transverse vertical surface, the lower surface of the tubular temporary binding component is welded with a main deck, and the upper surface of the tubular temporary binding component is spot-welded with the lower surface of a lower flange plate of a main beam at the main node layer of the upper module; and after the temporary binding members are transported to a site preset position, all the temporary binding members are cut off before sliding to the platform.
As a preferred technical solution of the present invention, the lower block is preferably a jacket or a high pile cap, a matched track beam is arranged on an upper cross-bracing surface of the jacket or an upper surface of the high pile cap, and a track extending direction, i.e., a sliding installation direction, is a major axis direction along a plane of the lower block with a larger dimension, i.e., the track beam intersects with a vertical surface with a smaller dimension; the length and the width of the track supporting structure are matched with the double-layer supporting truss of the upper module block and are symmetrical about the center of a plane. J-shaped pipes, a ship-leaning ladder and other accessory components are arranged on the outer sides of the two vertical surfaces with larger sizes so as to avoid collision risks.
As the preferred technical scheme of the invention, the track beams at the leaving side of the construction site, the two transverse sides of the transportation barge and the two sliding sides of the lower module all adopt square steel or square tubes with the same type, and the ends of the track beams are provided with slots for temporarily placing and connecting lintels, thereby facilitating the transfer of the upper module and the double-layer supporting truss between different carriers.
As a preferable technical scheme of the invention, the size design of each component and node of the upper block, the double-layer supporting truss, the lower block and the transportation barge is controlled by the loading, transportation and installation working conditions, wherein the redistribution of the bearing reaction force and the force transmission path caused by the suspension of each hydraulic device is considered in turn in the loading and installation working conditions.
As the preferred technical scheme of the invention, the process of sliding and loading the platform is carried out in a window period with calm wind and waves; before loading, a row of berthing piles are pre-installed in front of a vertical surface on one side of the designed loading, and are used for mooring the transportation barge in the loading process, so that the transportation barge is prevented from directly colliding with a lower chunk; in addition, the transportation barge is anchored and fixed with the seabed through mooring lines in the loading process, so that the surging and swaying motion of the transportation barge is controlled, the loading of the transportation barge is regulated through a hydraulic cabin, and the heaving motion of the transportation barge is not more than 15 cm.
It is a further object of the present invention to address the deficiencies of the prior art by providing a slip mounting system for an offshore electrical platform.
For this reason, the above object of the present invention is achieved by the following technical solutions:
a slip mounting system of an offshore electrical platform, the slip mounting system of the offshore electrical platform comprising an upper block, a double-deck support truss, an SPMT consist, a transport barge, a lower block and a fixed foundation of the offshore electrical platform; the upper block is temporarily supported by a double-layer support truss which is arranged on and supported by the SPMT consist, and the transportation barge is used for supporting and transporting the SPMT consist and the upper block and the double-layer support truss which are arranged on the SPMT consist; the lower block is disposed on a fixed foundation and is adapted to interface with the upper block and to support the upper block upwardly.
The invention can adopt or combine the following technical scheme while adopting the technical scheme:
in a preferred embodiment of the present invention, the lower block is a jacket or a high pile cap.
The invention provides a sliding type installation method and a sliding type installation system for an offshore electrical platform, which have the following beneficial effects:
1) the method has the advantages that the method is wide in application range, can be used for mounting ultra-shallow water depth and ultra-large ocean platforms, has low restrictive requirements on transportation barges, upper blocks and lower blocks besides the necessary bearing capacity requirements of the supporting structure, does not need to change the classical structural style and the arrangement scheme of the platforms, widens the selection range of engineering optimization, and can effectively control the construction period and the engineering quantity.
2) The butt joint of the upper block and the lower block of the offshore platform can be stably, accurately and controllably operated by means of the rail and the SPMT vehicle set, the collision and inclination problems possibly occurring in a hoisting method or a floating-supporting method are avoided, and a butt joint buffer device at the connection position of the pile is not required to be arranged.
3) Each step is convenient to construct, the operation is simple, and the engineering economic benefit is remarkable.
Drawings
Fig. 1 is a three-dimensional schematic diagram of a sliding installation method of an offshore electrical platform in a sliding loading process.
Fig. 2 is a three-dimensional schematic view of the skid-mounted installation method of the offshore electrical platform provided by the invention when the upper block is butted with the lower block.
FIG. 3 is a plan perspective view of the upper block-double layer support truss-SPMT car set.
FIG. 4a is a cross-sectional view taken in the direction B-B or D-D in FIG. 3, and FIG. 4B is a cross-sectional view taken in the direction C-C in FIG. 3; FIG. 4c is a cross-sectional view taken in the direction of 1-1 or 5-5 in FIG. 3; FIG. 4d is a cross-sectional view taken in the direction 2-2 or 4-4 of FIG. 3; fig. 4e is a cross-sectional view in the direction 3-3 of fig. 3.
Figure 5 is a schematic view of the arrangement of the binding members.
Fig. 6 is a three-dimensional schematic view of a jacket.
FIG. 7a is a schematic illustration of the connection of the lintel; fig. 7b is an enlarged view of a portion of the connection to the lintel.
Fig. 8 is a schematic plan view of the transport barge as it is being skidded onto the deck.
Detailed Description
To further illustrate the content, characteristics and efficacy of the invention, an embodiment of an offshore electrical platform is described, wherein the lower block is a jacket, the upper block is 3000 tons, and the water depth is about 4 m, and the embodiment is described in the following with reference to the accompanying drawings:
(1) as shown in fig. 1-2, the present embodiment comprises the following components: the offshore structure comprises 1-3000 ton offshore electrical platform upper module, 2-double-layer supporting trusses, 3-SPMT vehicle groups, 4-transportation barges and 5-jacket. The upper module 1 is built at quayside and is temporarily supported by a double-deck support truss 2, which is supported below the double-deck support truss 2 on horizontal brackets of an SPMT train 3. The upper block 1 and the double-layer support truss 2 are slid to a transportation barge 4 together from a construction site by an SPMT (spherical positioning machine) train set 3, the transportation barge 4 transports the upper block 1, the double-layer support truss 2 and the SPMT train set 3 to the site where the platform is located, and the jacket 5 is pre-installed and completely piled; after the transportation barge 4 is in place, the SPMT car group 3 lifts the upper chunk 1 and the double-layer support truss 2 to the maximum height and slides to a preset position on the jacket 5 from the right side of the jacket 5, and then the hydraulic lifting height of the SPMT car group 3 is reduced, so that the transportation barge 4 and the jacket 5 are butted and welded on site; and after welding is finished, the height of the hydraulic device of the SPMT car group 3 is restored to the original position, and the SPMT car group 3 together with the double-layer supporting truss 2 is returned to the transportation barge 4 to finish installation. In the embodiment, the maximum jacking height of the hydraulic device of the SPMT vehicle group 3 is 50 cm; in the process of sliding and loading, the automatic compensation is realized due to the uneven table top or the heave movement of the transportation barge, but the jacking height of a single device is not less than 35cm all the time; after the upper module 1, the double-layer support truss 2 and the SPMT vehicle group 3 slide and are put on the platform in place, the gap between the lower surface of the upper module 1 and the upper surface of the jacket 5 is 25 cm; after the butt joint is completed, the jacking height of each hydraulic device of the SPMT vehicle group 3 is not less than 10 cm.
(2) As shown in FIGS. 3-4: in this embodiment, the B \ D axis and 1\5 axis of the upper module 1 are the main axes for connecting the piles, the distance between 1-5 axes is greater than the distance between B-D axes, and the top elevation of the main beam 11 of the deck on one deckE t1= 16.00 m, height of deck girder 11 on one floorH tb1 = 0.8 m; the gap between the outer edge of an edge frame 21 of the double-layer supporting truss 2 and the inner edge of a main column welding seal plate 12 is 1m, and the position of a middle frame 22 corresponds to the beam column node and the beam support node between B \ D shafts of a deck of the upper module 1; standard skids 23 are arranged between each node of the upper layers of the edge frames 21 and the middle frames 22 and the deck main beam 11 of one layer, and the height of each standard skid 23H w = 0.3m, the two sides of the standard skid 23 are triangular shelves 24, the upper and lower surfaces of the triangular shelves 24 are respectively connected with the upper part of the double-layer supporting truss 2Spot welding the surface and the lower surface of the deck girder 11; the SPMT vehicle set 3 is provided with two vehicle sets 31 and 32, a track is parallel to a B-D shaft along the sliding direction, each vehicle set in the embodiment has 5 flatbeds, each flatbed has a front hydraulic jacking device and a rear hydraulic jacking device, the positions of the hydraulic jacking devices of the head-tail flatbeds are consistent with the positions of the two rows of frames of the head-tail flatbeds of the double-layer supporting truss 2 in the length direction, and the 3 middle flatbeds are respectively arranged in axial symmetry about 2, 3 and 4.
(3) In this embodiment, the upper surface of the upper wale of the jacket 5 is raisedE j1And the distance from the bottom surface of the vehicle to the lower surface of the double-layer supporting truss 2 when the lifting height of a hydraulic device of the SPMT vehicle group 3 is 10cm is = 9.6mH 10If = 1.5 m, the height between the upper and lower surfaces of the double-layered truss 2 is calculated according to the formula of the technical solutionH bf And was 3.8 m.
(4) As shown in fig. 5, rail support platforms 41 and 42 are pre-installed in this embodiment transversely along the hull of the transport barge 4 with centerline spacing consistent with the centerline spacing of 31 and 32. A tripod type binding member 43 is arranged at the main node of the lower side of the edge frame 21, the lower bottom surface of the tripod type binding member 43 is welded with the main deck of the transportation barge 4, and the upper surface is welded with the lower surface of the edge frame 21; and a tubular binding member 44 is arranged at a main node where the B \ D axis of the deck main beam 11 on the first layer is intersected with the 2, 3 and 4 axes, the lower bottom surface of the tubular binding member 44 is welded with the main deck of the transportation barge 4, and the upper surface of the tubular binding member is welded with the lower surface of the deck main beam 11 on the first layer. After the transport barge 4 reaches the specified position, the tripod type banding members 43 and the tubular banding members 44 are cut off before the slide-up is performed.
(5) As shown in fig. 6, in the present embodiment, the structural style of the jacket 5 is substantially the same as that of the conventional jacket, but 4 additional sunken rail support trusses 51, 52, 53, 54, 51 and 52, and 53 and 54 have the same center line spacing as that of the coaxial wheels of each flat car, and are matched with 31, 32 and 41, 42. The upper chord of each truss adopts a square tube structure, the upper surface of the upper chord is aligned with the upper horizontal cross bracing surface of the jacket 5, and the height isE j1= 9.6m, total length slightly greater thanThe overall length of the double-layered support truss 2; the lower chord and the stay bar are all circular tube members, and the lower chord is only supported on the upper X-shaped stay bar of the shorter side vertical surface. The J-shaped pipe, the ship climbing ladder and other accessory members 55 are arranged on the outer side of the longer side vertical surface to avoid the collision problem in the sliding and landing process.
(6) As shown in fig. 7, the ends of the two sides of the track beams 41-42 and 51-54 are square pipes with the same type, the end parts are provided with grooves 61, the bottom of each square pipe is prefabricated with a spherical limiting structure 62, and each square pipe can be matched with an end opening 64 of a connecting lintel 63, so that the spot rapid deployment is facilitated, and the transfer of the upper block 1, the double-layer supporting truss 2 and the SPMT car group 3 between the transportation barge 4 and the jacket 5 is assisted.
(7) In the embodiment, the size design of each component and node of the auxiliary upper block 1, the double-layer supporting truss 2, the transportation barge 4 and the jacket 5 is controlled by the shipping, transportation and installation conditions, wherein the redistribution of the bearing counter force and the force transmission path caused by the suspension of 5 groups 10 of hydraulic devices of the SPMT car group 3 is considered in the shipping and installation conditions.
(8) As shown in fig. 8, a row of mooring piles 71 is pre-driven into the right side of the jacket 5. The transport barge 4 is parked on the mooring piles 71 after reaching a predetermined position without colliding with the jacket 5. The installation operation is carried out in a window period with good weather conditions, the transportation barge 4 is anchored with the mooring piles 71 and the seabed through the mooring lines 72, the three-way movement of the upper assembly block 1, the double-layer support truss 2, the SPMT vehicle group 3 and the transportation barge 4 in the sliding installation process is limited, and the heave movement of the transportation barge 4 is not more than 15 cm.
The above embodiment is merely a preferred embodiment of the present invention, and those skilled in the art will understand that modifications or substitutions of technical solutions or parameters in the embodiment can be made without departing from the principle and essence of the present invention, and all of them shall be covered by the protection scope of the present invention.
Claims (1)
1. A method of skid-mounted electrical offshore platforms, comprising: after an upper module of the offshore electrical platform is built on a building site, a double-layer supporting truss is arranged on the lower portion of the offshore electrical platform for temporary supporting, an SPMT (moving plate transport) train set is arranged below the truss and is supported on a sliding rail of the building site, and a rail and a supporting frame with the same width are arranged on a transport barge; the upper module and the double-layer support truss of the offshore electric platform are glidingly loaded by an SPMT (fixed platform management machine) train set and then are transported to a construction site of the offshore electric platform by a barge;
the fixed foundation at the lower part of the offshore electric platform is pre-installed, and a track matched with a construction site and a transportation barge is arranged in the upper horizontal plane of the offshore electric platform; the upper block and the double-layer supporting truss of the offshore electrical platform are still supported by the SPMT vehicle group and are slid to a preset position on the lower block of the offshore electrical platform by the transportation barge, so that the horizontal position of the main connecting column of the upper block is aligned with the pile top of the lower block; the hydraulic jacking device of the SPMT car group is in a high position in the process of sliding on the platform, a certain gap is reserved between the lower surface of the main connecting column of the upper chunk and the pile top of the lower chunk, the hydraulic jacking device of the SPMT car group falls after the position is in place, so that the surfaces of the piles and the columns are stably butted, the connection position of the piles and the columns is welded on site, and finally the hydraulic device of the SPMT car group is adjusted to the lowest position and is retreated to the transport barge along a rail together with the double-layer support truss;
the dimension and the topology of the double-layer supporting truss are determined by the following conditions:
(1) the edge width is 2m less than the distance between the inner side edges of the main column connecting plates of the upper module, namely, 1m of gaps are reserved between the outer edges of the two sides of the double-layer support truss and the main axis of the pile-column in the sliding and landing process;
(2) the hydraulic support distance of the SPMT vehicle group is two times larger than the distance of the main axis of the pile-column in the direction, namely the hydraulic support positions of the first row of trolleys and the last row of trolleys are ensured to be consistent with the position of the vertical stay bar of the double-layer support truss;
(3) except the edge frame nodes in the width direction, the horizontal position of the main node corresponds to the beam column, beam brace node and other strong structures of the upper block deck, and a stiffening rib is arranged between the upper flange plate and the lower flange plate of the upper block deck girder at the edge frame support;
(4) a skid is arranged between the upper module and a layer of node of the double-layer support truss, triangular steps are arranged on two sides of the skid, the lower surfaces of the triangular steps are welded with the double-layer support truss, and the upper surfaces of the triangular steps and the lower surface of a layer of deck beam of the upper module are spot-welded;
(5) height H of double-layer support trussbfI.e., the distance between the upper surface and the lower surface, is determined by the following equation:
Hbf＝Et1–Ej1–Htb1–Hw–H10
in the formula: et1Top elevation of deck beam of upper modulej1Is the top level elevation of the lower module, Htb1Height of deck main beam of upper modulewHeight of the skid, H10The distance from the bottom surface of the vehicle to the lower surface of the support truss is 10cm when the jacking height of a hydraulic device of the vehicle group is 10 cm;
the SPMT vehicle group is a self-propelled hydraulic flat car group, and a single flat car consists of a front hydraulic device, a rear hydraulic device and a tray above the front hydraulic device and the rear hydraulic device; the number of train sets is determined according to the number of tracks of a construction site, a barge and a lower chunk, and a group of flatbeds connected end to end is defined as a train; the positions of the front hydraulic device and the rear hydraulic device of each row of the platform lorry at the head and the tail correspond to the positions of the nodes of the supporting truss, the train sets are uniformly and symmetrically arranged along the row direction, and each platform lorry on the same row is fixedly connected through a tray to form a whole; the jacking stroke of a hydraulic device of the vehicle set is not less than 50 cm; in the process of sliding on the platform, the hydraulic device can automatically compensate due to uneven reference surface or movement of the transportation barge, but the jacking height of each device is not less than 35cm before falling and docking; after the butt joint is finished, the jacking height of each device is not less than 10cm, and when the train set and the support truss are withdrawn, the gap between the upper surface of the train set and the upper chunk is not less than 10 cm;
the transportation barge is provided with a rail support platform on a deck in advance before loading the upper module and the double-layer support truss; after the upper module and the double-layer supporting truss are in place, installing a tripod type temporary binding member at the edge frame node in the width direction, welding the lower surface of the temporary binding member with the main deck, and performing spot welding on the upper surface of the temporary binding member and the edge frame node; meanwhile, a tubular temporary binding component is arranged on a main node on the main axis of the pile-column layer of the upper module at the two sides of the double-layer supporting truss with the transverse vertical surface, the lower surface of the tubular temporary binding component is welded with a main deck, and the upper surface of the tubular temporary binding component is spot-welded with the lower surface of a lower flange plate of a main beam at the main node layer of the upper module; after the temporary binding members are transported to a site preset position, all the temporary binding members are cut off before sliding to a platform;
the lower module is a jacket or a high pile cap, a matched track beam is arranged on the upper cross bracing surface of the jacket or the upper surface of the high pile cap, the extending direction of the track, namely the sliding installation direction, is the major axial direction with larger plane dimension along the lower module, namely the track beam is intersected with the vertical surface with smaller dimension; the length and the width of the track supporting structure are matched with the double-layer supporting truss of the upper module block and are symmetrical about the center of a plane;
the track beams on the leaving side of the construction site, the two transverse sides of the transportation barge and the two sliding sides of the lower module are all made of square steel or square tubes with the same model, and the ends of the track beams are provided with slots for temporarily placing and connecting lintels, so that the upper module and the double-layer supporting truss can be conveniently transferred among different carriers;
the size design of each component and node of the upper block, the double-layer supporting truss, the lower block and the transportation barge is controlled by the working conditions of shipping, transportation and installation, wherein the re-distribution of the bearing counter force and the force transmission path caused by the suspension of each hydraulic device is considered in the shipping and installation working conditions;
the sliding and landing process is carried out in a window period with calm wind and waves; before loading, a row of berthing piles are pre-installed in front of a vertical surface on one side of the designed loading, and are used for mooring the transportation barge in the loading process, so that the transportation barge is prevented from directly colliding with a lower chunk; in addition, the transportation barge is anchored and fixed with the seabed through mooring lines in the loading process, so that the surging and swaying motion of the transportation barge is controlled, the loading of the transportation barge is regulated through a hydraulic cabin, and the heaving motion of the transportation barge is not more than 15 cm.
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| CN111099389B (en) * | 2019-12-13 | 2021-05-14 | 南通泰胜蓝岛海洋工程有限公司 | Ship loading device and method for offshore booster station |
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| CN114991072B (en) * | 2022-05-20 | 2023-06-27 | 中交第二航务工程局有限公司 | Working platform and working method for dredging and stone throwing among piles of high-pile wharf |
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