JP7132559B2 - Offshore platform and manufacturing method by prefabricated jacket combining aluminum pipe - confined concrete - steel pipe - Google Patents

Description

TECHNICAL FIELD The present invention relates to the structural engineering technical field of civil engineering, and more particularly to an offshore platform with an aluminum tube-confined concrete-steel tube combination prefabricated jacket and its manufacturing method.

Offshore platform is the infrastructure for exploitation of offshore resources, of which the conduit offshore platform is the main structural form of the shallow water offshore platform. It anchors a prefabricated jacket on the sea by passing piles through the conduit, the jacket and piles being the main load-bearing members, and other equipment layers and working areas located on the platform. The dynamic stresses of the marine environment, such as wind, waves, currents, ice and earthquakes act on the structure to make the vibration response very intense.

In the conventional viable technical solutions, the vibration control of the tubular offshore platform structure is, as one, mainly damping by using anti-vibration measures or various dampers, and the anti-vibration measures are the jacket end Although the displacement of the cap and the acceleration of the living area can be well controlled, it is not suitable for loads such as tsunamis and gusts and is prone to capsizing.

The other is an improved structural form. Since the traditional structure form does not meet the requirements of structural design, more and more combination structure forms are applied in actual construction. By overcoming the shortcomings of , we have built a new system structure, making full use of the characteristics of steel and concrete, and based on the optimum geometric dimensions, we can construct the best combination members. It has advantages such as light weight, high ductility, small cross-sectional area, and short construction period. In combination structure, concrete-filled steel pipe is a more widely applied structural form. According to the site, the scientific use of concrete-filled steel pipe is related to engineering structures such as large spans, high rises, and heavy loads. It satisfies the requirements and meets the requirements of industrialization in modern construction technology. Concrete-filled steel pipe structures have gained the support of the construction industry due to their high performance in areas such as stress and construction construction.

Prefabricated architecture is widely popular in China, but in the field of offshore platform structure, the transition from conventional design and construction methods to prefabricated structural forms is still an urgent problem. The Chinese invention patent with application number CN201510351272.0 provides a self-reset jacket marine platform, the conduit structure includes an outer steel pipe, an inner steel pipe, a corrugated pipe and an intermediate layer of concrete, and a precast inside the corrugated pipe and outside the platform. Additional stress steel tie rods are added to achieve self-recovery under loads such as sea ice and earthquakes. However, the welding process is required in all construction processes. Considering the thickness of the concrete-filled steel pipe, the welding process is very difficult on the one hand, and on the other hand, the welding of steel pipes is all one-sided welding, which reduces the weld connection strength. It does not meet the requirements and poses a safety risk. In addition, beam nodes are also important stress and force transmission members in the structural system unless welding methods are used. - Assembly of lateral (diagonal) support connection nodes is also a problem to be solved.

In addition, the researcher provided the self-elevating offshore platform prefabricated prefabricated legs, including stainless steel outer tube and high-strength round steel tube. The bearing capacity of a single steel pipe column is inferior to that of a hollow double-walled steel pipe concrete composite column.

From the above, there is still a lack of new forms in the assembly of concrete-filled steel pipe systems, and the node connection device can not only meet the seismic performance requirements of "strong nodes, weak members", but also realize the modularization of the assembly of offshore platform structures. The design of is an issue that should be solved urgently in the field of structural engineering.

In view of the above shortcomings of the prior art, the present invention provides an offshore platform with an aluminum tube-confined concrete-steel tube combination prefabricated jacket, and the complicated process of underwater welding and safety due to insufficient welding strength. Effectively avoid the above risks. At the same time, the offshore platform can be reused due to the advantage of the assembly type structure, which is easy to dismantle, and the assembly modularization of the offshore platform structure is realized.

The technical solutions of the present invention are as follows.

As one, the present invention discloses an offshore platform with an aluminum tube-confined concrete-steel tube combination prefabricated jacket, which consists of a jacket and a platform, the platform is attached to the jacket, the jacket is a conduit, and the platform lateral support. and a platform oblique support, the conduits are installed vertically, several platform lateral supports and platform oblique supports are provided between the conduits, the tip of the conduit is connected to the platform, and the bottom end of the conduit is fixed to the seabed. connected as

The conduit includes a plurality of interconnected conduit units, the conduit unit including an outer confined aluminum tube and an inner steel tube, the outer confined aluminum tube coaxially fitted with the inner steel tube, and the outer confined aluminum tube. An intermediate layer of confined concrete is filled between the pipe and the inner steel pipe, both end faces of the inner steel pipe are higher than both end faces of the outer confined aluminum pipe, and annular protrusions are formed on both ends of the inner steel pipe along the outer circumference. is provided.
Fixed connections are made between said conduit units, between conduit units and platform lateral supports, and between conduit units and platform oblique supports via nodes.

Secondly, the present invention further provides a method for manufacturing an offshore platform with an aluminum tube-confined concrete-steel tube combination prefabricated jacket, which includes the following steps.

(1) In the manufacture of conduits, the inner steel pipe is inserted into the outer confined aluminum pipe, the middle layer confined concrete is poured, and after the strength of the middle layer confined concrete that has been cast meets the requirements, multiple Conduit units are assembled into four conduits via cast aluminum nodes or cast iron nodes.

(2) Manufacture of the jacket by fixing the platform lateral support and the platform oblique support to the cast aluminum or cast iron nodes of the conduit with one-sided bolts, respectively.

(3) Platform assembly, which is pre-manufactured at a platform factory, then transported or floated to a construction site on the sea, placed in a predetermined position, steel piles and conduits are driven into the seabed, and then flange nodes are installed. Connect the platform to the tip of the conduit via.

Beneficial effects of the present invention are as follows.

1. The structural form of the prefabricated offshore platform of the present invention effectively avoids the complicated process of underwater welding and safety risks caused by insufficient welding strength. At the same time, the offshore platform can be reused due to the advantage of the assembly type structure, which is easy to dismantle, and the assembly modularization of the offshore platform structure is realized.

2. The present invention assembles large diameter concrete filled steel pipe column-to-column connection nodes through cast aluminum or cast iron nodes and flange nodes, and assembly in concrete-filled steel pipe column-to-column connections and column-to-lateral (diagonal) support connection nodes. It solves the problem of durability and satisfies the seismic performance requirements of “strong nodes, weak members”.

3. The present invention has high structural bearing capacity and good ductility of the conduit, among which the inner steel pipe plays the role of bearing the axial compressive load along the pipe wall, the length of the outer confined aluminum pipe is shorter than that of the inner steel pipe, Its ends have a constant clearance with the node and are not subjected to axial loads along the pipe wall, only radial concrete extrusion loads. When the concrete is subjected to pressure from multiple directions, the confining of the outer confined aluminum pipe against lateral pressure can limit the spread of microcracks inside the concrete, greatly improving the compressive strength of the concrete, and increasing the strength of the concrete. The load-bearing capacity of the conduit is increased over that of conventional outer wall penetrations through hollow double-walled concrete conduits, while at the same time improving the vibrational energy absorption capabilities of the conduit.

4. The present invention can also be used in combination with other types of anti-seismic means, such as other types of energy-attenuating seismic dampers, such as rotary dampers, to achieve good anti-seismic effects. The offshore platform with prefabricated jacket of aluminum pipe-confined concrete-steel pipe combination of the present invention is not limited to use in offshore platform structural systems, but can also be applied in prefabricated construction in the field of civil engineering, such as panel It can be applied to general building structures such as type building, box type building, frame panel type building, laminate type building, and steel structure and shaped steel concrete structure. At the same time, it can be all load-bearing structural columns and some weighted structural columns and temporary reinforcing columns. Here, the type of nodes to be assembled, the material, the number of nodes, the dimensions and materials of the conduits, and the specific means of arrangement, etc., can be completely adapted to the needs of operators, and the fields of application are wide.

5. Cast aluminum node or cast iron node and flange node cast in one piece only need to manufacture one mold, good workability, easy to manufacture, the whole structure is more stable, robust and adaptable and excellent mechanical properties.

In order to describe the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the drawings required for the description of the embodiments or the prior art. Other drawings can be derived from these drawings without significant effort.
1 is a structural schematic diagram of the present invention; FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; FIG. is a structural schematic diagram of a conduit unit; 4 is a front view of FIG. 3; FIG. is a connection schematic diagram in which two conduit units are connected via a node; 6] is a front view of FIG. 5. [FIG. 6 is a schematic diagram of the internal structure of FIG. 5; FIG. is a schematic diagram of the internal structure of the connecting part. 9 is a rear view of FIG. 8; FIG. 9 is a plan view of FIG. 8; FIG. is a structural schematic diagram of a flange node; 12 is a front view of FIG. 11; FIG. 12 is a bottom view of FIG. 11; FIG. is a connection schematic diagram in which a conduit and a platform are connected via a flange node; 15 is a side view of FIG. 14; FIG. 1 is a connection schematic diagram in which the conduit, platform and platform lateral support are connected via flange nodes; FIG.

In order for those skilled in the art to better understand the technical solutions in the present invention, the following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. . Obviously, the described embodiments are only some, but not all embodiments of the present invention. All other embodiments obtained by persons skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

As shown in FIGS. 1-16, the present invention provides an aluminum tube-confined concrete-steel tube combination prefabricated jacket offshore platform, which consists of a jacket and a platform 2, and the platform 2 is attached to the jacket.

The jacket includes conduits 1, platform lateral supports 4 and platform diagonal supports 5, the conduits 1 are installed vertically, and several platform lateral supports 4 and platform diagonal supports 5 are provided between the conduits 1, and the conduits 1 The tip is connected to the platform 2 and the bottom end of the conduit 1 is fixedly connected to the seabed.

As a further technical solution, in this embodiment, the conduit 1 is an aluminum tube-confined concrete-steel tube hollow double-walled member, and includes a plurality of interconnected conduit units 3 . Each conduit unit 3 includes an outer confined aluminum pipe 301 and an inner steel pipe 302 made of seamless steel pipe. and an inner steel pipe 302 are filled with intermediate layer confined concrete 303, both end faces of the inner steel pipe 302 are higher than both end faces of the outer confined aluminum pipe 301, and along the outer periphery at both ends of the inner steel pipe 302 respectively An annular protrusion 304 is provided.

Furthermore, fixed connections are made between the conduit units 3, between the conduit units 3 and the platform lateral supports 4, and between the conduit units 3 and the platform oblique supports 5 via cast aluminum nodes 6 or cast iron nodes 6 to The tip is connected to the platform 2 via a flange node 7, and the cast aluminum node 6 or cast iron node 6 and the flange node 7 are cast together.

However, in other embodiments, the outer confined aluminum tube 301 is not limited to the aluminum material disclosed in this embodiment, and can be made of other metal materials, which can be selected according to actual needs. .

Further, the integral structure of the protrusion 304 and the inner steel pipe 302 is such that after the inner steel pipe 302 is processed, annular end plates are welded to both ends of the inner steel pipe 302, respectively, and the inner diameter of the inner steel pipe 302 is Matches the inner diameter and facilitates butt welding. The outer diameter is slightly larger than the outer diameter of the intermediate layer confined concrete 303, which ensures that the conduit 3 is assembled in the recessed groove 68 and does not come off even under force, and the annular end plate is in this embodiment to form a protrusion 304 in .

As shown in FIGS. 5 and 6, the node 6 in this embodiment includes two symmetrically connected connecting portions, each said connecting portion being a locking portion 61 and an ear located on either side of the locking portion 61. Includes plate 69 . A high-strength bolt hole 64 is provided in the ear plate 69 , and the two connecting portions are bolted through the high-strength bolt hole 64 of the ear plate 69 .

Further, as shown in FIGS. 7, 8, 9, and 10, the locking portion 61 is a box with one side open, and includes an upper top plate 610, two side plates 612, a back plate 613, and a lower top plate 611. include. The upper top plate 610 and the lower top plate 611 are each cut into a semicircular opening, and the diameter of the opening matches the outer diameter of the intermediate layer confined concrete 303 . The inside of the engaging portion 61 is positioned between an upper top plate 610 and a lower top plate 611, and an upper partition plate 62 and a lower partition plate 65 are provided from top to bottom, respectively. Both the upper top plate 610 and the lower top plate 611 are provided with grooves 68 , and the protrusions 304 are formed 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 via the grooves 68 . , where recessed groove 68 is preferably semi-circular and its size matches the outer diameter of projection 304 . Two side plates 612 and a back plate 613 of the locking portion 61 are provided with one-side bolt holes 63 for fixedly connecting the platform lateral support 4 and the platform oblique support 5, respectively.

Further, as shown in FIGS. 11, 12 and 13, the flange node 7 includes a flange steel pipe 71, one end of the flange steel pipe 71 is provided with an annular first flange plate 72 along the outer circumference, and the other end An annular second flange plate 74 is provided along the inner periphery, and two cantilever web plates 73 are provided on the side surfaces, and the two cantilever web plates 73 are symmetrically installed with respect to the axis of the flange steel pipe.

As shown in FIG. 14, the first flange plate 72 and the platform 2 are connected via high-strength bolts 66, and as shown in FIG. They are connected via high strength bolts 66 . As shown in FIG. 16, the cantilever web plate 73 and the platform lateral support 4 are connected via high-strength bolts 66, respectively.
This embodiment further discloses a method of manufacturing the above marine platform:

(1) In the manufacture of the conduit 1, the inner steel pipe 302 is inserted into the outer confined aluminum pipe 301, the intermediate layer confined concrete 303 is placed, and the strength of the placed intermediate layer confined concrete 303 meets the requirements. After filling, the protrusions 304 on the inner steel pipes 302 of the adjacent conduit units 3 are placed between the upper top plate 610 and the upper partition plate 62 of the connection of one of the cast aluminum nodes 6 or cast iron nodes 6 respectively, the lower partition plate 65 and the lower top plate 611, and then fixedly connect the connecting portion to the ear plate 69 of the other connecting portion via high-strength bolts 66, thereby separating the two adjacent conduit units 3. The projections 304 are fixed in cast aluminum nodes 6 or cast iron nodes 6 and assembled into four conduits 1 after connecting a plurality of conduit units 3 according to the above method.

(2) Manufacture of the jacket, in which both ends of the platform lateral support 4 and the platform diagonal support 5 are preliminarily attached to the side and back plates of the cast aluminum node 6 or cast iron node 6 of the conduit 1 respectively assembled via single-sided bolts. Fixed to the left one side bolt hole 63, the length of the conduit 1, the platform lateral support 4, the platform diagonal support 5 can be determined based on the dimensions of each layer of the designed platform 2.

(3) Assembling the platform 2, after the platform 2 is manufactured in advance at a factory, it is transported or floated to a construction site on the sea, placed in a predetermined position, and then the steel pile and the conduit 1 are driven into the seabed, and the pipeline 1 tip projection 304 is fixed to the second flange plate 74 with high strength bolts 66, which in turn fix the platform 2 to the first flange plate 72 with high strength bolts 66, the cantilever web plate between adjacent flange nodes 7; 73 is connected to platform lateral support 4 with high strength bolts 66 . Thereby, the four conduits 1 are fixed below the platform 2 by high-strength bolts 66, thereby realizing the connection between the platform 2 and the conduits 1. FIG.

Assembled layer by layer from the bottom to the top by the above method, two adjacent conduit units 3 are assembled together by cast aluminum nodes 6 or cast iron nodes 6, assembled into four conduits 1, further platform lateral supports 4, After clamping platform diagonal support 5 and assembling it into the jacket, conduit 1 and platform 2 are connected via flange node 7 . If it needs to be dismantled, the order is the reverse of the installation order, it is easy to install and dismantle, the construction speed is greatly increased, the construction quality is high, it can be transported to the site and installed as it is, and it can be processed on site. It eliminates the process and can be widely applied to the construction of prefabricated offshore platforms in shallow waters.

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 confined aluminum pipe 301 is shorter than the inner steel pipe 302, and both ends have a certain gap with the node 6. It does not receive axial loads along the pipe wall, but only concrete extrusion loads along the radial direction. When the concrete receives pressure from multiple directions, the lateral pressure confining of the outer confined aluminum pipe 301 limits the spread of microcracks inside the concrete, greatly improving the compressive strength of the concrete. , the load-bearing capacity of the conduit 1 is increased compared to the conventional hollow double-walled concrete conduit through the outer wall, and the vibration energy absorption capacity of the conduit 1 is improved at the same time.
Preferably, the high-strength bolts 66 of the present invention employ Torsia-type high-strength bolts 66 to provide a more stable connection without relative slippage between the connecting members.

Furthermore, in the present invention, a rubber pad 67 is attached to the contact surface between the upper partition plate 62 and the projection 304 of the cast aluminum node 6 or the cast iron node 6 and the contact surface between the lower partition plate 65 and the projection 304, respectively. To facilitate buffering the impact when installing the conduit units 3 on both upper and lower ends of the .

Although the invention has been described in detail in conjunction with the preferred embodiments and with reference to the drawings, the invention is not so limited and it will be readily apparent to those skilled in the art that the invention can be practiced without departing from the spirit and substance of the invention. Various equivalent modifications or substitutions can be made to the examples, any of which are within the scope of the present invention or can be easily modified or substituted by those skilled in the art within the scope of the present disclosure. Any conceivable replacement should fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

1 Conduit 2 Platform 3 Conduit Unit 301 Outer Confined Aluminum Pipe 302 Inner Steel Pipe 303 Intermediate Confined Concrete 304 Protrusion 4 Platform Lateral Support 5 Platform Diagonal Support 6 Node 61 Locking Part 62 Upper partition plate 63 One side bolt hole 64 High-strength bolt hole 65 Lower partition plate 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 node, 71 flange steel pipe, 72 first flange plate, 73 cantilever web plate, 74 second flange plate

Claims (10)

It is composed of a jacket and a platform, the platform is attached to the jacket, the jacket includes a conduit, a platform lateral support and a platform oblique support, the conduit is installed vertically, and there are several platform lateral supports and platform obliques between the conduits. A support is provided, the top end of the conduit is connected to the platform and the bottom end of the conduit is fixedly connected to the seabed, said conduit being a combination aluminum tube-confined concrete-steel tube comprising a plurality of interconnected conduit units. A submarine jacketed offshore platform,
The conduit unit includes an outer confined aluminum pipe and an inner steel pipe, the outer confined aluminum pipe and the inner steel pipe are arranged coaxially, and an intermediate layer of confined concrete is provided between the outer confined aluminum pipe and the inner steel pipe. both end surfaces of the inner steel pipe are higher than both end surfaces of the outer confined aluminum pipe, and both ends of the inner steel pipe are provided with annular projections along the outer periphery, respectively;
An aluminum pipe-confined concrete-steel pipe combination assembly characterized in that fixed connections are made via nodes between the conduit units, between the conduit unit and the platform lateral support, and between the conduit unit and the platform oblique support. Offshore platform in formula jacket. The aluminum tube according to claim 1, characterized in that said node comprises two symmetrically connected joints, said joints comprising a locking part and ear plates installed on both sides of the locking part. - A prefabricated jacket offshore platform that combines confined concrete and steel pipes. The locking part is a box with one side open and includes an upper top plate, two side plates, a back plate and a lower top plate, the inside of the locking part is located between the upper top plate and the lower top plate, An upper partition plate and a lower partition plate are provided from top to bottom, both of the upper top plate and the lower top plate are provided with grooves, and the protrusions are formed between the lower partition plate and the lower top plate via the grooves. 3. The aluminum pipe according to claim 2, wherein a bolt hole is provided in the ear plate, and the two connecting parts are connected to the bolt through the bolt hole. An offshore platform with a prefabricated jacket that combines confined concrete and steel pipes. The aluminum pipe-confined concrete according to claim 3, characterized in that the two side plates and the back plate of the locking part are provided with one-side bolt holes for fixedly connecting the platform lateral support and the platform oblique support, respectively. - An offshore platform with a prefabricated jacket that combines steel pipes. The aluminum pipe-confined concrete-steel pipe according to claim 3, wherein rubber pads are attached to the contact surface between the upper partition plate and the projection and the contact surface between the lower partition plate and the projection, respectively. An offshore platform with an assembled jacket that combines The tip of the conduit is connected to the platform through a flange node, the flange node includes a flange steel pipe, one end of the flange steel pipe is provided with an annular first flange plate along the outer circumference, and the other end is provided with an inner flange plate. An annular second flange plate is provided along the circumference, and cantilever web plates are provided on the sides, between the first flange plate and the platform, between the second flange plate and the projection, and with the cantilever web plate. The aluminum tube-confined concrete-steel tube combination prefabricated jacket offshore platform according to claim 1, characterized in that the platform lateral supports are connected to each other through connecting members. The combined aluminum tube-confined concrete-steel tube prefabricated jacket offshore platform according to claim 1, characterized in that said nodes use cast aluminum nodes or cast iron nodes. The aluminum tube-confined concrete-steel tube combination prefabricated jacket offshore platform according to claim 7, characterized in that the aluminum cast node or cast iron node and the flange node are cast in one piece. The offshore platform with prefabricated jacket of aluminum tube-confined concrete-steel tube combination according to claim 1, characterized in that the inner steel tube is a seamless steel tube. The inner steel pipe is inserted into the outer confined aluminum pipe, the middle layer confined concrete is poured, the strength of the middle layer confined concrete that is poured meets the requirements, and then the multiple conduit units are cast aluminum nodes or cast iron nodes. step (1) of manufacturing the conduit by assembling it into four conduits by
step (2) of fabricating the jacket by securing the lateral platform support and the oblique platform support with single-sided bolts to the cast aluminum or iron nodes of the conduit, respectively;
After pre-manufacturing at a platform factory, it is transported or floated to a construction site on the sea, placed in a predetermined position, and then driven into the seabed with steel piles and pipes, and then connected to the tip of the pipe through a flange node. step (3) of assembling the platform by
A method for manufacturing an aluminum tube-confined concrete-steel tube combination prefabricated jacket offshore platform according to any one of claims 1-9, characterized in that it comprises:

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