CN110195427A - Assembly type aluminum pipe-confined concrete-steel pipe combined jacket ocean platform - Google Patents

Abstract

The invention discloses an assembled aluminum tube-confined concrete-steel tube combined jacket marine platform and a manufacturing method thereof, belonging to the technical field of structural engineering of civil engineering. The technical scheme is as follows: it is composed of a jacket and a platform, the platform is installed on the jacket, the jacket includes a duct, a platform transverse brace and a platform diagonal brace, the ducts are arranged in the vertical direction, and the ducts are arranged between the ducts and inside the platform respectively. There are several platform cross braces and platform diagonal braces, the top end of the conduit is connected to the platform, the bottom end of the conduit is fixedly connected to the seabed, and the conduit includes a plurality of connected conduit units; the conduit units are aluminum pipes-confined concrete-steel pipes Double-walled hollow member. The invention effectively avoids the complicated process of underwater welding and the potential safety hazard caused by insufficient welding strength. At the same time, the advantage of easy disassembly of the assembled structure makes the recycling of the offshore platform possible, and realizes the modular assembly of the offshore platform structure.

Description

Assembled aluminum tube-confined concrete-steel tube combined jacket offshore platform

technical field

The invention relates to the technical field of structural engineering of civil engineering, in particular to an assembled aluminum tube-constrained concrete-steel tube combined jacket offshore platform and a manufacturing method thereof.

Background technique

As the infrastructure for the development of marine resources, the offshore platform is the main structural form of the offshore platform in the medium and shallow seas. The prefabricated jacket is fixed on the sea by passing the piles through the conduit, the jacket and piles are the main load-bearing components, and other equipment layers and working areas are located on the platform. Under the action of marine environmental dynamic loads such as wind, wave, current, ice and earthquake, the vibration response of the structure is very severe.

In the existing feasible technical solutions, for the vibration control of the ducted offshore platform structure, on the one hand, vibration isolation measures or various dampers are mainly used for anti-vibration, but although the vibration isolation measures can better control the jacket The displacement of the end cap and the acceleration of the living area are not suitable for loads such as tsunamis and hurricanes, and are easy to overturn.

Another aspect is to improve the structure. Conventional structural forms can no longer meet the requirements of structural design, and more and more composite structural forms are applied to practical projects. Composite structures inherit the advantages of steel structures and reinforced concrete structures, and also overcome their shortcomings. A new type of architecture that can make full use of the characteristics of steel and concrete to form the optimal composite components according to the optimal geometric dimensions. It has the advantages of light weight, good ductility of components, reduced cross-sectional area, and shortened construction period. In the composite structure, CFST is the most widely used structural form. The scientific use of CFST according to local conditions can meet the needs of related engineering structures such as large span, towering, and heavy load, and meet the industrialization requirements of modern construction technology. Structures are favored by the engineering community for their high performance in terms of force and construction.

Although prefabricated buildings have been greatly promoted in my country, for the field of offshore platform structures, the transition from conventional design and construction methods to prefabricated structures is still an urgent problem to be solved. The Chinese invention patent with the application number CN201510351272.0 proposes a self-resetting jacket offshore platform, the conduit structure of which includes an outer steel pipe, an inner steel pipe, a corrugated pipe and interlayer concrete, and a prestressed outer pipe is installed inside the corrugated pipe and outside the platform. Steel tie rods are installed to realize self-reset under loads such as sea ice and earthquakes. However, the welding process is required in the construction process, which brings great difficulty to the welding process for the thick wall of concrete-filled steel tubes. requirements, resulting in security risks. However, if the welding method is not adopted, since the beam-column joint is also an important force-bearing and force-transmitting member in the structural system, the assembly of the column-column connection node of the large-diameter CFST, as well as the column-column connection and the column-column connection of the CFST The assembly at the connection node of the transverse (diagonal) bracing is also a problem that needs to be solved.

Some scholars have proposed prefabricated pile legs for jack-up offshore platforms, including stainless steel outer pipes and high-strength round steel pipes. Although the structural form meets the requirements of prefabricated structures, it is undeniable that a single steel pipe column is obviously inferior to a double-wall hollow column. CFST composite columns have high bearing capacity.

It can be seen that the assembly of CFST system still lacks new forms. Designing a node connection device that can not only meet the seismic performance requirements of "strong nodes and weak members" but also realize the modular assembly of offshore platform structures is an urgent need in the field of structural engineering. problem to be solved.

SUMMARY OF THE INVENTION

In view of the above deficiencies of the prior art, the present invention provides an assembled aluminum tube-constrained concrete-steel tube combined jacket marine platform, which effectively avoids the complex process of underwater welding and the potential safety hazards caused by insufficient welding strength. At the same time, the advantage of easy disassembly of the assembled structure makes the recycling of the offshore platform possible, and realizes the modular assembly of the offshore platform structure.

The technical scheme of the present invention is:

The fabricated aluminum tube-confined concrete-steel tube combined jacket offshore platform is composed of a jacket and a platform. The platform is installed on the jacket. The jacket includes a duct, a platform cross brace and a platform diagonal brace. The duct is in the vertical direction. Setting, there are several platform cross braces and platform diagonal braces between the ducts, the top end of the duct is connected to the platform, and the bottom end of the duct is fixedly connected to the seabed; the duct includes a plurality of connected duct units, and the duct unit includes an external The restraining aluminum tube and the inner steel pipe are made of aluminum material, which makes full use of the corrosion resistance of the aluminum alloy material and effectively avoids the problem that the conduit is corroded by seawater; the outer restraining aluminum pipe and the inner steel pipe are coaxially sleeved The outer restraint aluminum tube and the inner steel pipe are filled with interlayer restraint concrete, the two end faces of the inner steel pipe are higher than the two end faces of the outer restraint aluminum pipe, and the two ends of the inner steel pipe are respectively provided with circular rings along the outer circumference. the protruding limbs; the conduit units, between the conduit unit and the platform cross brace, and between the conduit unit and the platform diagonal brace are fixedly connected through nodes, the nodes include two symmetrically connected connecting parts, and the connecting parts include A snap portion and lugs arranged on both sides of the snap portion, the snap portion is a box body with one side open, including an upper top plate, two side plates, a back plate and a lower top plate, the inside of the snap portion, It is located between the upper top plate and the lower top plate. There are upper and lower partitions from top to bottom. The upper and lower top plates are both provided with grooves, and the protruding limbs can be clipped into the upper top plate through the grooves. In the space between the upper clapboard, the lower clapboard and the lower top plate, the lug plate is provided with high-strength bolt holes, and the two connecting parts are connected by bolts through the high-strength bolt holes on the lug plate, and the two connecting parts of the clamping part are bolted together. Each side plate and the back plate are respectively provided with unilateral bolt holes for fixing the platform cross brace and the platform diagonal brace. The platform cross brace and platform diagonal brace are fastened to the bolt holes reserved on the side plate and back plate of the node through unilateral bolts. The assembly process is efficient and fast, and the length of the conduit, platform cross brace and platform diagonal brace can be designed according to the design. The size of each layer of the platform may be determined. The node is assembled by two connecting parts connected by high-strength bolts, and the protruding limbs of the upper and lower conduit units are respectively fixed between the upper and upper partitions, the lower partition and the lower roof of the node through grooves. In this way, the nodes and the protruding limbs are closely combined with good stability, and the high-strength bolt connection can increase the connection strength. The top of the conduit is connected to the platform through a flange node, the flange node includes a flanged steel pipe, one end of the flanged steel pipe is provided with a circular first flange plate along the outer circumference, and the other end is along the outer circumference. The inner circumference is provided with an annular second flange plate, and the side is provided with a cantilever web, between the first flange plate and the platform, between the second flange plate and the protruding limbs, and the cantilever web It is connected with the platform transverse support by high-strength bolts respectively.

Further, rubber pads are respectively pasted on the contact surfaces of the upper clapboard and the protruding limbs of the node and the contact surfaces of the lower clapboard and the protruding limbs, so as to buffer the impact of the conduit units at the upper and lower ends of the node during installation.

Further, the high-strength bolts are friction-type high-strength bolts, so that there is no relative slippage between the connecting components, and the connection is more secure.

Further, the nodes are cast aluminum nodes or cast iron nodes, and the conduits, platform cross braces and platform diagonal braces are connected and assembled through cast aluminum nodes or cast iron nodes, which is conducive to the processing, transportation, hoisting and on-site installation of fabricated structural components.

Further, the cast aluminum node or cast iron node and the flange plate node are integrally cast.

Further, the inner steel pipe adopts seamless steel pipe.

The present invention also provides a manufacturing method of an assembled aluminum tube-constrained concrete-steel tube composite jacket offshore platform, comprising the following steps:

(1) Manufacture of conduit: insert an inner steel pipe into the outer restraint aluminum pipe, pour interlayer restraint concrete, and after the strength of the interlayer restraint concrete to be poured meets the requirements, assemble a plurality of pipe units through cast aluminum nodes or cast iron nodes into 4 pipes;

(2) Fabrication of jacket: The platform transverse brace and the platform diagonal brace are respectively fixed on the cast aluminum node or cast iron node of the conduit through unilateral bolts;

(3) Platform assembly: After the platform is prefabricated in the factory, it is transported to the offshore construction site by barge or float. After being in place, the steel piles and conduits are driven into the seabed, and then the platform is connected to the top of the conduit through flange nodes.

Further, the two end faces of the inner steel pipe are higher than the two end faces of the outer restraining aluminum pipe, and the two ends of the inner steel pipe are respectively provided with annular protruding limbs along the outer circumference; the cast aluminum node or cast iron node includes two The connecting part is symmetrically connected, the connecting part includes a clamping part and ear plates arranged on both sides of the clamping part, and the clamping part is a box body with an open side, including an upper top plate, two side plates, a back plate and The lower top plate, the inside of the clipping portion, is located between the upper top plate and the lower top plate, and is respectively provided with an upper partition plate and a lower partition plate from top to bottom, the upper and lower top plates are provided with grooves, so The protruding limbs can be inserted into the gaps between the upper top plate and the upper clapboard, the lower clapboard and the lower top plate through the groove. The two side plates and the back plate of the clamping part are respectively provided with unilateral bolt holes for fixing and connecting the platform cross brace and the platform diagonal brace.

Further, the flange joint includes a flanged steel pipe, one end of the flanged steel pipe is provided with a circular first flange plate along the outer circumference, and the other end is provided with a circular second flange along the inner circumference. The flange plate is provided with a cantilever web on the side, and the connection between the first flange plate and the platform, between the second flange plate and the protruding limb, and between the cantilever web and the platform cross brace are respectively connected by high-strength bolts .

The beneficial effects of the present invention are:

1. The structural form of the assembled marine platform of the present invention effectively avoids the complex process of underwater welding and the potential safety hazards caused by insufficient welding strength. At the same time, the advantage of easy disassembly of the assembled structure makes the recycling of the offshore platform possible, and realizes the modular assembly of the offshore platform structure.

2. The present invention solves the assembly of the column-column connection node of the large-diameter concrete filled steel tube, and the column-column connection of the concrete-filled steel tube and the column-horizontal (oblique) bracing connection node through the cast aluminum node or the cast iron node and the flange node. The assembly problem meets the seismic performance requirements of "strong joints and weak members".

3. In the present invention, the structural bearing capacity of the conduit is high and the ductility is good, wherein the inner steel pipe plays the role of bearing the axial compressive load along the pipe wall, the length of the outer restraining aluminum pipe is smaller than that of the inner steel pipe, and there is a certain gap between the two ends of the pipe, which is not Bear the axial load along the pipe wall and only bear the concrete extrusion load along the radial direction. When the concrete is compressed in multiple directions, the development of micro-cracks inside the concrete is restricted due to the restraint of the lateral pressure by the externally constrained aluminum tube, which can greatly improve the compressive strength of the concrete and make the bearing capacity of the conduit compared with the traditional outer wall through the double wall. The hollow concrete conduit is enlarged, which also enhances the seismic energy dissipation performance of the conduit.

4. The present invention can also be used in combination with other types of anti-vibration means, such as other types of energy-dissipating shock-absorbing dampers, such as corner dampers, etc., to achieve better anti-vibration effects. The fabricated aluminum tube-confined concrete-steel tube composite jacket offshore platform of the present invention is not only limited to use in the offshore platform structural system, but can still be installed and applied in fabricated buildings in the field of civil engineering. For example, it can be applied to common building structures such as plate-type buildings, box-type buildings, skeleton plate-type buildings, elevated buildings, as well as steel structures and steel-concrete structures; at the same time, it can be used as all load-bearing structural columns and partial weighing-type structural columns and temporary reinforcement columns. Among them, the assembly node form, material, number of nodes, the size and material of the conduit, as well as the specific layout plan, etc., can completely depend on the needs of the owner, and the application field is wide.

5. For integrally poured cast aluminum joints or cast iron joints and flange joints, only one mold needs to be made, which has good manufacturability, easy manufacturing, more stable and reliable overall structure, good adaptability, and excellent mechanical properties.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. In other words, other drawings can also be obtained based on these drawings without creative labor.

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 .

FIG. 3 is a schematic view of the structure of the catheter unit.

FIG. 4 is a front view of FIG. 3 .

Figure 5 is a schematic diagram of the connection of two conduit units connected by a node.

FIG. 6 is a front view of FIG. 5 .

FIG. 7 is a schematic diagram of the internal structure of FIG. 5 .

FIG. 8 is a schematic diagram of the internal structure of the connecting portion.

FIG. 9 is a rear view of FIG. 8 .

FIG. 10 is a plan view of FIG. 8 .

Figure 11 is a schematic diagram of the structure of the flange node.

FIG. 12 is a front view of FIG. 11 .

FIG. 13 is a bottom view of FIG. 11 .

Figure 14 is a schematic diagram of the connection of the conduit and the platform through the flanged joint.

FIG. 15 is a side view of FIG. 14 .

Figure 16 is a schematic diagram of the connection of conduits, platforms and platform cross braces through flanged joints.

In the figure, 1-duct, 2-platform, 3-duct unit, 301-external restraint aluminum pipe, 302-inner steel pipe, 303-interlayer restraint concrete, 4-platform cross brace, 5-platform diagonal brace, 6-node, 61-clamping part, 62-upper partition, 63-one-side bolt hole, 64-high-strength bolt hole, 65-lower partition, 66-high-strength bolt, 67-rubber pad, 68-groove, 69-ear plate , 610-upper top plate, 611-lower top plate, 612-side plate, 613-back plate, 7-flange joint, 71-flange steel pipe, 72-first flange plate, 73-cantilever web, 74- The second flange plate, 8-protruding limbs.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figures 1-16, the present invention provides an assembled aluminum tube-confined concrete-steel tube combined jacket offshore platform, which consists of a jacket and a platform 2, and the platform 2 is installed on the jacket, and the jacket includes The duct 1, the platform cross brace 4 and the platform diagonal brace 5, the duct 1 is arranged in the vertical direction, there are several platform horizontal braces 4 and platform diagonal braces 5 between the duct 1, the top of the duct 1 is connected to the platform 2, the duct 1 The bottom end of the duct 1 is fixedly connected to the seabed, and the duct 1 is an aluminum tube-constrained concrete-steel pipe double-walled hollow member, including a plurality of connected duct units 3; the duct unit 3 includes an externally constrained aluminum tube 301 and a seamless steel tube. The inner steel pipe 302 is made; the outer restraining aluminum pipe 301 and the inner steel pipe 302 are coaxially sleeved; the interlayer restraining concrete 303 is filled between the outer restraining aluminum pipe 301 and the inner steel pipe 302; The end faces are higher than the two end faces of the outer restraining aluminum tube 301, and the two ends of the inner steel tube 302 are respectively provided with annular protruding limbs 8 along the outer circumference; Between, the conduit unit 3 and the platform diagonal brace 5 are fixedly connected through the cast aluminum node 6 or the cast iron node 6; the top of the conduit 1 is connected to the platform 2 through the flange node 7; the cast aluminum node 6 or the cast iron node 6, And the flange joint 7 is cast as a whole.

The node 6 includes two symmetrically connected connecting parts; the connecting part includes a clamping part 61 and ear plates 69 arranged on both sides of the clamping part 61; the clamping part 61 is a box body with an open side, including The upper top plate 610, the two side plates 612, the back plate 613 and the lower top plate 611; the interior of the clip portion 61 is located between the upper top plate 610 and the lower top plate 611, and there are upper partitions 62 and 61 respectively from top to bottom. The lower partition 65; the upper top plate 610 and the lower top plate 611 are provided with grooves 68, and the protruding limbs 8 can be clipped into the upper top plate 610 and the upper partition plate 62, the lower partition plate 65 and the lower top plate through the groove 68 In the space between 611, the groove 68 is preferably semi-circular, and its size matches the outer diameter of the inner steel pipe 302; the lug plate 69 is provided with high-strength bolt holes 64, and the two connecting parts pass through the lug plate 69. The two side plates 612 and the back plate 613 of the clamping part 61 are respectively provided with unilateral bolt holes 63 for fixing and connecting the platform cross brace 4 and the platform diagonal brace 5 .

The flange joint 7 includes a flanged steel pipe 71; one end of the flanged steel pipe 71 is provided with a circular first flange plate 72 along the outer circumference, and the other end is provided with a circular second flange along the inner circumference. The flange plate 74 is provided with a cantilever web 73 on the side; between the first flange plate 72 and the platform 2, between the second flange plate 74 and the protruding limb 8, and between the cantilever web 73 and the platform The braces 4 are respectively connected by high-strength bolts 66 .

Production Method:

(1) Fabrication of the conduit 1: Insert the inner steel pipe 302 into the outer restraint aluminum pipe 301, pour the interlayer restraint concrete 303, and after the strength of the interlayer restraint concrete 303 to be poured meets the requirements, place the protrusions on the inner steel pipe 302 of the adjacent pipe unit 3 The limbs 8 are respectively inserted into the gaps between the upper top plate 610 and the upper partition plate 62 and between the lower partition plate 65 and the lower top plate 611 of one of the connecting parts of the cast aluminum node 6 or the cast iron node 6, and then connected by high-strength bolts 66. One part is fixedly connected with the ear plate 69 of the other connecting part, so that the protruding limbs 8 of the two adjacent conduit units 3 are fixed in the cast aluminum node 6 or the cast iron node 6, and the plurality of conduit units 3 are connected according to the above method and assembled into a 4 catheters 1;

(2) Fabrication of the jacket: the two ends of the platform cross brace 4 and the platform diagonal brace 5 are respectively fixed on the cast aluminum node 6 of the assembled conduit 1 or the side plate and the back plate of the cast iron node 6 through unilateral bolts. On the unilateral bolt hole 63 of the duct 1, the length of the platform cross brace 4 and the platform diagonal brace 5 can be determined according to the designed dimensions of each layer of the platform 2;

(3) Assembly of platform 2: After the platform 2 is prefabricated in the factory, it will be transported to the offshore construction site by barge or float. After being in place, the steel piles and the conduit 1 will be driven into the seabed, and the platform 2 will be fixed on the first flange by high-strength bolts 66. On the plate 72 , the protruding limb 8 at the top of the conduit 1 is fixed on the second flange plate 74 by high-strength bolts 66 , and the cantilever web 73 between the adjacent flange nodes 7 is connected with the platform cross brace 4 through high-strength bolts 66 . . In this way, the four conduits 1 are fixed under the platform 2 through the high-strength bolts 66 , so as to realize the connection between the platform 2 and the conduits 1 .

Through the above method from bottom to top, the two adjacent conduit units 3 are assembled into one by the cast aluminum node 6 or the cast iron node 6, and then assembled into four conduits 1, and then the platform cross braces 4 and platform diagonal braces are fastened. 5. Assemble the jacket into a jacket, and then connect the jacket 1 and the platform 2 through the flange node 7 . When it needs to be dismantled, the order of installation is reversed. It is easy to install and disassemble, which greatly speeds up the construction speed and has high construction quality. It can be directly transported to the site for installation, eliminating the need for on-site processing procedures. 's construction.

In the present invention, the inner steel pipe 302 plays the role of bearing the axial compressive load along the pipe wall. The length of the outer restraining aluminum pipe 301 is smaller than that of the inner steel pipe 302, and its two ends have a certain gap from the node 6, so it does not bear the axial load along the pipe wall. Only bear the concrete crushing load along the radial direction. When the concrete is compressed in multiple directions, the development of micro-cracks inside the concrete is restricted due to the restraint of the lateral pressure by the external restraint aluminum tube 301, which can greatly improve the compressive strength of the concrete, and make the bearing capacity of the conduit 1 higher than that of the traditional outer wall. The double-walled hollow concrete conduit is enlarged, which also enhances the seismic energy dissipation performance of the conduit 1 .

Preferably, the high-strength bolts 66 of the present invention are friction-type high-strength bolts 66, so that there is no relative slippage between the connecting components, and the connection is more secure.

Further, in the present invention, rubber pads 67 are respectively pasted on the contact surfaces of the upper clapboard 62 of the cast aluminum node 6 or the cast iron node 6 and the protruding limbs 8, and the contact surfaces of the lower clapboard 65 and the protruding limbs 8, It is convenient to buffer the impact when the conduit units 3 at the upper and lower ends of the node 6 are installed.

Although the present invention has been described in detail in conjunction with the preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all fall within the scope of the present invention/any Those skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should all be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (9)

1. assembled aluminum pipe-confined concrete-steel pipe combination offshore jacket platforms, are made of, platform jacket and platform (2) (2) it is mounted on jacket, the jacket includes conduit (1), platform stull (4) and platform diagonal brace (5), and conduit (1) is perpendicular Histogram is set up, and several platform stulls (4) and platform diagonal brace (5) are equipped between conduit (1), and the top of conduit (1) connects The bottom end of platform (2), conduit (1) is fixedly connected on seabed, it is characterised in that:

The conduit (1) includes multiple duct units (3) being connected, and the duct unit (3) includes external constraint aluminum pipe (301) and interior steel pipe (302), the external constraint aluminum pipe (301) with interior steel pipe (302) is coaxial is arranged, the external constraint aluminium It manages and is filled with interlayer confined concrete (303) between (301) and interior steel pipe (302), the both ends of the surface of the interior steel pipe (302) are higher by The both ends of the surface of external constraint aluminum pipe (301), and the both ends of interior steel pipe (302) are respectively equipped with the convex limb (8) of circular ring shape along excircle；

Between the duct unit (3), between duct unit (3) and platform stull (4), duct unit (3) and platform diagonal brace (5) Between be fixedly connected by node (6), the node (6) includes two interconnecting pieces symmetrically connected, and the interconnecting piece includes card In the otic placode (69) of clamping portion (61) two sides, the clamping portion (61) is the box body of one side opening for socket part (61) and setting, including Upper plate (610), two side plates (612), backboard (613) and lower roof plate (611), the inside of the clamping portion (61) are located at upper Between top plate (610) and lower roof plate (611), it is respectively equipped with upper spacer (62) and lower clapboard (65), the upper plate from top to bottom (610) and on lower roof plate (611) be all provided with fluted (68), the convex limb (8) can be sticked by groove (68) upper plate (610) and In gap between upper spacer (62), lower clapboard (65) and lower roof plate (611), the otic placode (69) is equipped with High-strength bolt hole (64), two interconnecting pieces are bolted by the High-strength bolt hole (64) on otic placode (69), two sides of the clamping portion (61) The unilateral bolt hole for being fixedly connected with platform stull (4) and platform diagonal brace (5) is respectively provided on plate (612) and backboard (613) (63)；

The top of the conduit (1) is connect by ring flange node (7) with platform (2), and the ring flange node (7) includes flange Steel pipe (71), one end of the flange steel tube (71) are equipped with the first flange plate (72) of circular ring shape along excircle, and the other end is in Circumference is equipped with the second flange plate (74) of circular ring shape, and side is equipped with cantilever web (73), the first flange plate (72) and platform (2) between, between the second flange plate (74) and convex limb (8) and between cantilever web (73) and platform stull (4) respectively It is connected by high-strength bolt (66).

2. assembled aluminum pipe-confined concrete-steel pipe combination offshore jacket platforms as described in claim 1, feature exist In on: the upper spacer (62) of the node (6) and the contact surface of convex limb (8) and the contact surface of lower clapboard (65) and convex limb (8) It is upper to be adhesive with rubber pad (67) respectively.

3. assembled aluminum pipe-confined concrete-steel pipe combination offshore jacket platforms as described in claim 1, feature exist In: the high-strength bolt (66) uses frictional high-strength bolts (66).

4. assembled aluminum pipe-confined concrete-steel pipe combination offshore jacket platforms as described in claim 1, feature exist In: the node (6) uses cast aluminum node (6) or cast iron node (6).

5. assembled aluminum pipe-confined concrete-steel pipe combination offshore jacket platforms as claimed in claim 4, feature exist In: the cast aluminum node (6) or cast iron node (6) and ring flange node (7) one-piece casting form.

6. assembled aluminum pipe-confined concrete-steel pipe combination offshore jacket platforms as described in claim 1, feature exist In: the interior steel pipe (302) uses seamless steel pipe.

7. the production method of assembled aluminum pipe-confined concrete-steel pipe combination offshore jacket platforms, it is characterised in that: including Following steps,

(1) production of conduit (1): steel pipe (302) in being inserted into external constraint aluminum pipe (301) pours interlayer confined concrete (303), after pouring interlayer confined concrete (303) intensity and meeting the requirements, multiple duct units (3) are passed through into cast aluminum node (6) or cast iron node (6) is assembled into 4 conduits (1)；

(2) platform stull (4) and platform diagonal brace (5) production of jacket: are fixed on conduit (1) by unilateral bolt respectively On cast aluminum node (6) or cast iron node (6)；

(3) platform (2) assembles: after the completion of platform (2) prefabrication, by transportation by lighter or transportation by driving to offshore construction scene, in place Piling bar and conduit (1) are squeezed into seabed afterwards, platform (2) is then connected to by ring flange node (7) top of conduit (1).

8. the production side of assembled aluminum pipe-confined concrete-steel pipe combination offshore jacket platforms as claimed in claim 7 Method, it is characterised in that:

The both ends of the surface of the interior steel pipe (302) are higher by the both ends of the surface of external constraint aluminum pipe (301), and the both ends of interior steel pipe (302) The convex limb (8) of circular ring shape is respectively equipped with along excircle；

The cast aluminum node (6) or cast iron node (6) include two interconnecting pieces symmetrically connected, and the interconnecting piece includes clamping portion (61) and setting is in the otic placode (69) of clamping portion (61) two sides, and the clamping portion (61) is the box body of one side opening, including upper top Plate (610), two side plates (612), backboard (613) and lower roof plate (611), the inside of the clamping portion (61) are located at upper plate (610) between lower roof plate (611), it is respectively equipped with upper spacer (62) and lower clapboard (65), the upper plate (610) from top to bottom With fluted (68) are all provided on lower roof plate (611), the convex limb (8) can be sticked by groove (68) upper plate (610) and on every In gap between plate (62), lower clapboard (65) and lower roof plate (611), the otic placode (69) is equipped with High-strength bolt hole (64), Two interconnecting pieces are bolted by the High-strength bolt hole (64) on otic placode (69), two side plates of the clamping portion (61) (612) with the unilateral bolt hole for being fixedly connected with platform stull (4) and platform diagonal brace (5) is respectively provided on backboard (613) (63)。

9. the production side of assembled aluminum pipe-confined concrete-steel pipe combination offshore jacket platforms as claimed in claim 8 Method, it is characterised in that: the ring flange node (7) includes flange steel tube (71), and one end of the flange steel tube (71) is along outer circle It is equipped with the first flange plate (72) of circular ring shape week, the other end is equipped with the second flange plate (74) of circular ring shape along inner periphery, and side is set Have cantilever web (73), between the first flange plate (72) and platform (2), the second flange plate (74) and convex limb (8) it Between and cantilever web (73) and platform stull (4) between connect respectively by high-strength bolt (66).