WO2021000604A1

WO2021000604A1 - Assembled aluminum pipe, confined concrete and steel pipe combined jacket offshore platform and manufacturing method therefor

Info

Publication number: WO2021000604A1
Application number: PCT/CN2020/079813
Authority: WO
Inventors: 张纪刚; 赵迪; 张君博; 刘菲菲; 马哲昊; 时成龙; 孙佳; 刘锦昆; 刘景涛
Original assignee: 青岛理工大学
Priority date: 2019-07-01
Filing date: 2020-03-18
Publication date: 2021-01-07
Also published as: JP2022517748A; CN110195427A; JP7132559B2

Abstract

The present invention relates to the technical field of structural works of civil engineering. Disclosed are an assembled aluminum pipe, confined concrete and steel pipe combined jacket offshore platform and a manufacturing method therefor. According to the technical solution, the assembled aluminum pipe, confined concrete and steel pipe combined jacket offshore platform consists of a jacket and a platform; the platform is mounted on the jacket; the jacket comprises guide pipes, horizontal platform braces, and inclined platform braces; the guide pipes are arranged in the vertical direction; a plurality of horizontal platform braces and inclined platform braces are provided between the guide pipes and inside the platform, respectively; the tops of the guide pipes are connected to the platform, and the bottoms of the guide pipes are fixedly connected to the seabed; the guide pipes comprise a plurality of guide pipe units connected to one another; the guide pipe units are aluminum pipe-confined concrete-steel pipe double-walled hollow components. The present invention effectively avoids the complex process of underwater welding and the potential safety hazards caused by insufficient welding strength. In addition, because the assembled structure is easy to disassemble, the recycling of the offshore platform becomes possible, and the assembly modularization of the offshore platform structure is achieved.

Description

Assembled aluminum tube-constrained concrete-steel pipe combined jacket ocean platform and manufacturing method

Technical field

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

Background technique

The offshore platform is the infrastructure for the development of marine resources, and the ducted offshore platform is the main structural form of the offshore platform in the medium and shallow seas. It uses piles to pass through conduits to fix the prefabricated jackets on the sea. Jackets and piles are the main load-bearing components, and other equipment floors and working areas are located on the platform. Under the dynamic loads of the marine environment such as wind, waves, currents, ice and earthquakes, the vibration response of the structure is very intense.

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

Another aspect is to improve the structure. Conventional structural forms no longer meet the requirements of structural design. More and more combined structural forms are applied to actual projects. The combined structure inherits the advantages of steel structure and reinforced concrete structure, and overcomes the shortcomings of both. A new type of system structure can make full use of the characteristics of steel and concrete to form the best combined components according to the best geometric dimensions. It has the advantages of light weight, good ductility, reduced cross-sectional area, and shortened construction period. In the composite structure, concrete-filled steel tube is the most widely used structural form. The use of concrete-filled steel tube according to local conditions and scientifically can meet the needs of related engineering structures such as large spans, towering, and heavy loads, and meet the industrial requirements of modern construction technology. The structure is favored by the engineering community because of its high performance in terms of force and construction.

Although prefabricated buildings have been greatly promoted in my country, the transition from conventional design and construction methods to prefabricated structures is still an urgent problem in the field of offshore platform structures. The Chinese invention patent with application number CN201510351272.0 proposes a self-resetting jacket offshore platform. Its conduit structure includes outer steel pipes, inner steel pipes, corrugated pipes and sandwich concrete, and pre-stressed outer pipes are installed inside the corrugated pipes and outside the platform. A steel tie rod is installed to realize self-resetting under sea ice, earthquake and other loads. However, the welding process is required during the construction process. For the thick wall of concrete-filled steel tube, on the one hand, it brings great difficulty to the welding process. On the other hand, the welding of steel pipes is single-sided welding, and the welding connection strength cannot reach Requirements, which brings safety hazards. However, if the method of welding is not adopted, because the beam-column nodes are also important force-bearing and force-transmitting members in the structural system, the assembly of the column-column connection nodes of the large-diameter steel tube concrete, and the column-column connection and column- The assembly at the connecting node of the horizontal (diagonal) brace is also a problem to be solved.

Other 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 not as good as a double-wall hollow The concrete-filled steel tube composite column has high bearing capacity.

It can be seen that the assembly of concrete-filled steel tube systems still lacks new forms. It is urgent to design a joint connection device that can not only meet the seismic performance requirements of "strong joints and weak components" but also realize modular assembly of offshore platform structures. Problems to be solved.

Summary of the invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides a prefabricated aluminum tube-constrained concrete-steel pipe combination jacket offshore platform, which effectively avoids the complicated process of underwater welding and the 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 the modularization of the structure of the offshore platform is realized.

The technical scheme of the present invention is:

In the first aspect, the present invention discloses a prefabricated aluminum tube-constrained concrete-steel pipe combined jacket offshore platform, which is composed of a jacket and a platform. The platform is installed on the jacket. The jacket includes a pipe, a platform cross brace and Platform diagonal braces, the ducts are arranged in the vertical direction, a number of platform transverse braces and platform diagonal braces are arranged 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 conduit includes a plurality of connected conduit units, the conduit unit includes an external constrained aluminum tube and an inner steel tube, the external constrained aluminum tube and the inner steel tube are sleeved coaxially, and the external constrained aluminum tube and the inner steel tube are coaxially sleeved. It is filled with sandwich constrained concrete, the two end faces of the inner steel pipe are higher than the two end faces of the outer constrained aluminum pipe, and the two ends of the inner steel pipe are respectively provided with annular convex limbs along the outer circumference;

The duct units, the duct units and the platform cross braces, and the duct units and the platform diagonal braces are fixedly connected by nodes.

In the second aspect, the present invention also provides a method for manufacturing a fabricated aluminum tube-constrained concrete-steel tube combined jacket offshore platform, which includes the following steps:

(1) Conduit production: insert the inner steel pipe into the external constrained aluminum pipe, pour the interlayer constrained concrete, and after the pouring interlayer constrained concrete strength meets the requirements, assemble multiple conduit units through cast aluminum or cast iron nodes into 4 conduits;

(2) Fabrication of jacket: Fix the platform cross brace and platform diagonal brace to the cast aluminum node or cast iron node of the pipe by single-sided bolts;

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

The beneficial effects of the present invention are:

1. The structural form of the assembled offshore platform of the present invention effectively avoids the complicated process of underwater welding and the 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 the modularization of the structure of the offshore platform is realized.

2. The present invention solves the problem of the assembly of the column-column connection node of the large-diameter steel tube concrete through the cast aluminum node or the cast iron node and the flange node, as well as the column-column connection and the column-transverse (oblique) brace connection node of the steel tube concrete The assemblability problem of this machine satisfies the seismic performance requirements of "strong nodes and weak members".

3. In the present invention, the structure of the pipe has high bearing capacity and good ductility. The inner steel pipe plays the role of bearing the axial load along the pipe wall. The length of the external constrained aluminum pipe is smaller than the inner steel pipe. There is a certain gap between the two ends of the pipe and the node. Bear the axial load along the pipe wall, and only bear the concrete squeeze load along the radial direction. When the concrete is compressed in multiple directions, the external restraint aluminum tube restricts the lateral pressure to restrict the development of micro-cracks in the concrete, which can greatly improve the compressive strength of the concrete, making the carrying capacity of the pipe more than the traditional outer wall through the double wall The hollow concrete conduit is enlarged, which also enhances the seismic energy consumption performance 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 dissipation dampers, such as corner dampers, to achieve better anti-seismic effects. The assembled aluminum tube-constrained concrete-steel tube combined jacket offshore platform of the present invention is not only limited to the use in the offshore platform structure system, but can still be installed and applied in the assembled buildings in the civil engineering field. For example, it can be applied to common building structures such as panel building, box building, skeleton panel building, elevated building, and steel structure and steel concrete structure; at the same time, it can be used as all load-bearing structural columns, and partial weighing structural columns And temporary reinforcement columns. Among them, the assembled node form, material, number of nodes, the size and material of the conduit, and the specific layout plan, etc., can completely depend on the needs of the owner, and the application fields are wide.

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

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, those of ordinary skill in the art are In other words, other drawings can be obtained based on these drawings without creative work.

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

Fig. 2 is a sectional view taken along the line A-A in Fig. 1.

Fig. 3 is a schematic diagram of the structure of the catheter unit.

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

Fig. 5 is a schematic diagram of the connection of two duct units connected by nodes.

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 between the pipe and the platform through the flange node.

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

Figure 16 is a schematic diagram of the connection of the pipe, the platform and the platform brace through the flange node.

In the figure, 1-conduit, 2-platform, 3-conduit unit, 301-external constrained aluminum pipe, 302-inner steel pipe, 303-sandwich constrained concrete, 304-protrusive limb, 4-platform transverse brace, 5-platform diagonal brace , 6-node, 61-clamping part, 62-upper partition, 63-single 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 node, 71-flange steel pipe, 72-first flange plate, 73-cantilever Web, 74-second flange plate.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

As shown in Figures 1 to 16, the present invention provides an assembled aluminum tube-constrained concrete-steel pipe combination jacket offshore platform, which is composed of a jacket and a platform 2, and the platform 2 is installed on the jacket;

The jacket includes a conduit 1, a platform cross brace 4 and a platform diagonal brace 5. The conduit 1 is arranged in the vertical direction. There are a number of platform cross braces 4 and platform braces 5 between the conduit 1 and the top end of the conduit 1 is connected to the platform 2. , 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-constrained concrete-steel steel pipe double-wall hollow member, and includes a plurality of connected conduit units 3; each of the conduit units 3 includes an externally constrained aluminum tube 301 And the inner steel pipe 302 made of seamless steel pipe; the outer constrained aluminum pipe 301 and the inner steel pipe 302 are coaxially sleeved; the outer constrained aluminum pipe 301 and the inner steel pipe 302 are filled with sandwich constrained concrete 303; the inner The two end surfaces of the steel pipe 302 are higher than the two end surfaces of the externally restrained aluminum pipe 301, and the two ends of the inner steel pipe 302 are respectively provided with annular convex limbs 304 along the outer circumference.

Further, between the duct units 3, between the duct unit 3 and the platform cross brace 4, between the duct unit 3 and the platform diagonal brace 5, are fixedly connected by a cast aluminum node 6 or a cast iron node 6; the top of the conduit 1 is connected by a flange. The node 7 is connected with the platform 2; the cast aluminum node 6 or cast iron node 6 and the flange plate node 7 are integrally cast.

It is not difficult to understand that in other embodiments, the above-mentioned externally restrained aluminum tube 301 is not limited to the aluminum material disclosed in this embodiment, and can also be made of other metal materials; it can be selected according to actual needs.

Further, the protruding limbs 304 and the inner steel pipe 302 have an integral structure. Specifically, after the inner steel pipe 302 is processed, a circular end plate is welded at both ends of the inner steel pipe 302, and the inner diameter of the ring is the same as the inner diameter of the inner steel pipe 302. , It is convenient for butt welding; the outer diameter is slightly larger than the outer diameter of the sandwich constrained concrete 303 to ensure that the pipe 3 is assembled in the groove 68 and will not be pulled out when stressed. The circular end plate forms the convex limb in this embodiment 304.

As shown in Figures 5 and 6, the node 6 in this embodiment includes two symmetrically connected connecting parts; each of the connecting parts includes a clamping part 61 and an ear plate 69 provided on both sides of the clamping part 61; The ear plate 69 is provided with a high-strength bolt hole 64, and the two connecting parts are bolted through the high-strength bolt hole 64 on the ear plate 69.

Further, as shown in FIGS. 7, 8, 9, and 10, the clamping portion 61 is a box with an open side, and includes an upper top plate 610, two side plates 612, a back plate 613, and a lower top plate 611; The upper top plate 610 and the lower top plate 611 are respectively cut with semicircular openings, and the diameter of the opening matches the outer diameter of the sandwich constrained concrete 303; the inside of the clamping portion 61 is located between the upper top plate 610 and the lower top plate 611, from top to bottom An upper partition 62 and a lower partition 65 are respectively provided; both the upper top plate 610 and the lower top plate 611 are provided with grooves 68, and the protruding limbs 304 can be inserted into the upper top plate 610 and the upper partition 62 through the groove 68 In the gap between the lower partition plate 65 and the lower top plate 611, the groove 68 is preferably semicircular and its size matches the outer diameter of the protruding limb 304; the two side plates 612 and The back plate 613 is respectively provided with single-sided bolt holes 63 for fixing and connecting the platform cross brace 4 and the platform diagonal brace 5.

Further, as shown in Figure 11, Figure 12, and Figure 13, the flange node 7 includes a flange steel pipe 71; one end of the flange steel pipe 71 is provided with a ring-shaped first flange plate along the outer circumference 72, the other end is provided with an annular second flange plate 74 along the inner circumference, and two cantilever webs 73 are provided on the side; the two cantilever webs 73 are arranged symmetrically with respect to the axis of the flange steel pipe.

As shown in Figure 14, the first flange plate 72 and the platform 2 are connected by high-strength bolts 66; as shown in Figure 15, the second flange plate 74 and the protruding limb 304 are connected by high-strength bolts 66 As shown in Figure 16, the cantilever web 73 and the platform cross brace 4 are respectively connected by high-strength bolts 66.

This embodiment also discloses a manufacturing method of the above-mentioned ocean platform:

(1) Fabrication of conduit 1: Insert the inner steel pipe 302 into the external constrained aluminum pipe 301, and pour the interlayer constrained concrete 303. After the strength of the interlayer constrained concrete 303 meets the requirements, the convex of the inner steel pipe 302 of the adjacent conduit unit 3 The limbs 304 are respectively inserted into the gaps between the upper top plate 610 and the upper partition 62, and between the lower partition 65 and the lower top plate 611 of one of the connection parts of the cast aluminum node 6 or the cast iron node 6, and then the high-strength bolt 66 is used to connect the The lug plate 69 of the other connecting portion is fixedly connected to each other, so that the protruding limbs 304 of the two adjacent duct units 3 are fixed in the cast aluminum node 6 or the cast iron node 6, and the multiple duct units 3 are connected according to the above method and assembled into 4 catheters 1;

(2) Fabrication of the jacket: fix the two ends of the platform cross brace 4 and the platform diagonal brace 5 to the cast aluminum node 6 or cast iron node 6 of the assembled pipe 1 by single-sided bolts. On the unilateral bolt hole 63, the length of the conduit 1, the platform cross brace 4, and the platform diagonal brace 5 can be determined according to the dimensions of the designed platform 2;

(3) Platform 2 assembly: After the factory prefabrication of platform 2 is completed, it is transported to the offshore construction site by barge or float. After being in place, the steel piles and pipe 1 are driven into the seabed. The protruding limb 304 at the top of the pipe 1 is fixed in place by high-strength bolts 66 On the second flange plate 74, the platform 2 is fixed on the first flange plate 72 by high-strength bolts 66, and the cantilever webs 73 between adjacent flange nodes 7 are connected to the platform horizontal by high-strength bolts 66. Support 4. In this way, the four conduits 1 are fixed under the platform 2 by the high-strength bolts 66, so that the connection between the platform 2 and the conduit 1 is realized.

Assembled layer by layer from bottom to top through the above method, the two adjacent duct units 3 are assembled by cast aluminum nodes 6 or cast iron nodes 6 into one body, assembled into 4 ducts 1, and then fasten platform cross brace 4 and platform diagonal brace 5. Assemble into a jacket, and then connect the pipe 1 and the platform 2 through the flange node 7. When it needs to be dismantled, the order is the opposite of the installation order. It is easy to install and disassemble, which greatly speeds up the construction speed. The construction quality is high. It can be directly transported to the site for installation, eliminating the on-site processing procedures, and can be widely used in shallow sea areas. Build.

In the present invention, the inner steel pipe 302 plays the role of bearing the axial load along the pipe wall. The externally restrained aluminum pipe 301 has a smaller length than the inner steel pipe 302, and its two ends have a certain gap from the node 6, and does not bear the axial load along the pipe wall. Only bear the concrete squeeze load along the radial direction. When the concrete is compressed in multiple directions, the external restraint aluminum tube 301 restricts the lateral pressure to restrict the development of micro-cracks inside the concrete, which can greatly improve the compressive strength of the concrete, making the carrying capacity of the conduit 1 more than the traditional outer wall penetration The double-wall hollow concrete conduit is enlarged, which also enhances the seismic and energy consumption performance of the conduit 1.

Preferably, the high-strength bolt 66 of the present invention adopts the friction-type high-strength bolt 66, so that there is no relative slippage between the connecting parts, and the connection is more tight.

Further, in the present invention, the contact surface of the upper partition 62 of the cast aluminum node 6 or the cast iron node 6 and the protruding limb 304, and the contact surface of the lower partition 65 and the protruding limb 304 are respectively pasted with rubber pads 67, It is convenient to buffer the impact of the installation of the pipe unit 3 at the upper and lower ends of the node 6.

Although the present invention has been described in detail by referring to the drawings and in conjunction with the preferred embodiments, 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 be within the scope of the present invention/anything. Those skilled in the art can easily conceive of changes or substitutions within the technical scope disclosed by the present invention, and they should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

A prefabricated aluminum tube-constrained concrete-steel pipe combined jacket offshore platform is composed of a jacket and a platform. The platform is installed on the jacket. The jacket includes a pipe, platform cross braces and platform diagonal braces. 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; its characteristics are:

The conduit includes a plurality of connected conduit units, the conduit unit includes an external constrained aluminum tube and an inner steel tube, the external constrained aluminum tube and the inner steel tube are sleeved coaxially, and the external constrained aluminum tube and the inner steel tube are coaxially sleeved. It is filled with sandwich constrained concrete, the two end faces of the inner steel pipe are higher than the two end faces of the outer constrained aluminum pipe, and the two ends of the inner steel pipe are respectively provided with annular convex limbs along the outer circumference;

The duct units, the duct units and the platform cross braces, and the duct units and the platform diagonal braces are fixedly connected by nodes.
The assembled aluminum tube-constrained concrete-steel pipe combined jacket offshore platform of claim 1, wherein the node includes two symmetrically connected connecting parts, and the connecting parts include a clamping part and a set Ear plates on both sides of the clamping part.
The assembled aluminum tube-constrained concrete-steel pipe combined jacket offshore platform of claim 2, wherein the clamping part is a box with an opening on one side, including an upper top plate, two side plates, and a back The inner part of the clamping part is located between the upper top plate and the lower top plate. An upper partition and a lower partition are respectively provided from top to bottom. The upper and lower top plates are provided with grooves The protruding limb can be inserted into the gap between the lower partition board and the lower top plate through the groove, the lug plate is provided with bolt holes, and the two connecting parts are connected by the bolt holes and the bolts.
The assembled aluminum tube-constrained concrete-steel tube combined jacket offshore platform according to claim 3, characterized in that: the two side plates and the back plate of the clamping part are respectively provided with a horizontal plane for fixing the connection platform Single-sided bolt holes for support and platform diagonal support.
The fabricated aluminum tube-constrained concrete-steel pipe combined jacket offshore platform of claim 3, wherein: the contact surface of the upper diaphragm and the convex limb of the node, and the contact between the lower diaphragm and the convex limb Rubber pads are attached to the surfaces respectively.
The assembled aluminum tube-constrained concrete-steel pipe composite jacket offshore platform of claim 1, wherein the top of the tube is connected to the platform through a flange node, and the flange node includes a method Blue steel pipe, one end of the flange steel pipe is provided with an annular first flange plate along the outer circumference, the other end is provided with an annular second flange plate along the inner circumference, and the side is provided with a cantilever web, so The connection between the first flange plate and the platform, the second flange plate and the protruding limbs, and the cantilever web and the platform cross brace are respectively connected by connecting pieces.
The fabricated aluminum tube-constrained concrete-steel tube combined jacket offshore platform according to claim 1, wherein the nodes are cast aluminum nodes or cast iron nodes.
The assembled aluminum tube-constrained concrete-steel tube combined jacket offshore platform of claim 7, wherein the cast aluminum node or cast iron node and flange node are integrally cast.
The fabricated aluminum tube-constrained concrete-steel pipe combined jacket offshore platform of claim 1, wherein the inner steel pipe is a seamless steel pipe.
The manufacturing method of an assembled aluminum tube-constrained concrete-steel pipe combination jacket offshore platform according to any one of claims 1-9, characterized in that it comprises the following steps:

Step 1. Fabrication of the conduit: insert the inner steel pipe into the outer constrained aluminum pipe, pour the sandwich constrained concrete, and after the pouring of the sandwich constrained concrete meets the requirements, assemble multiple conduit units through cast aluminum or cast iron nodes to form 4 conduits;

Step 2. Fabrication of the jacket: Fix the platform cross brace and platform diagonal brace to the cast aluminum node or cast iron node of the pipe by single-sided bolts;

Step 3. Platform assembly: After the platform factory is prefabricated, it is transported to the offshore construction site by barge or float, and the steel piles and pipes are driven into the seabed after they are in place, and then the platform is connected to the top of the pipe via flange nodes.