Super large offshore steel pipe composite pile and construction method thereof

Abstract

The application discloses a super-large offshore steel pipe composite pile and a construction method thereof, relates to the technical field of composite piles, and solves the problems of limited fixing points, inconvenient operation, poor stability and firmness of the steel pipe composite pile during assembly and fixing. The super-large offshore steel pipe composite pile comprises a composite steel pipe pile, a steel casing arranged outside the composite steel pipe pile, a composite pile platform plate installed at the top of the steel casing, and a steel pipe assembly positioning structure installed inside the composite pile platform plate and arranged outside the composite steel pipe pile. In the application, on one hand, the honeycomb structure can improve the strength, stability and firmness of the steel pipe composite pile after assembly. On the other hand, the steel pipe composite pile is assembled and fixed in a staggered manner, so that the space arrangement during assembly and fixing of the steel pipe composite pile is improved, and the maximum supporting and fixing effect is realized in the minimum space.

Description

Technical Field

[0001] This invention relates to the field of composite pile technology, specifically to an extra-large offshore steel pipe composite pile and its construction method. Background Technology

[0002] Marine engineering refers to the construction, reconstruction, or expansion of projects aimed at developing, utilizing, protecting, and restoring marine resources, with the main body of the project located on the seaward side of the coastline. When constructing bridges in marine engineering projects, it is necessary to construct the foundation pile structure for the bridge.

[0003] Steel-pipe composite piles are a key foundation structure in marine engineering, mainly used in the construction of major facilities such as cross-sea bridges and offshore wind power. Their core feature lies in combining the high strength of steel pipe piles with the corrosion resistance of composite materials to adapt to complex marine environments.

[0004] However, this steel pipe composite pile has the following drawbacks in practical use:

[0005] 1. When existing steel pipe composite piles are erected and laid in marine environments to support the bridge structure above, the stability and firmness of the supporting steel pipe composite piles must be ensured on the seabed to guarantee the safety of the bridge construction and laying. Traditional steel pipe composite pile erection methods typically involve drilling into the seabed soil and mud layers, then burying the steel pipe composite piles deep into the excavated seabed. However, traditional steel pipe composite piles are usually fixed to the top platform using large bolts or welding. The former has limited fixing points and is inconvenient to operate; subsequently, transportation and installation are complex and cumbersome, making it difficult to transport them to the ocean for construction.

[0006] 2. After existing steel pipe composite piles are installed in the seabed, in order to ensure the stability and firmness of the installation, it is necessary to fill the interior of the steel pipe composite pile with mud to enhance its overall support capacity. Traditionally, this is done by pumping the mud into the interior of the steel pipe composite pile. However, due to the actual operating environment of steel pipe composite piles (most of the bottom of the pile is located on the seabed), the mud, after solidification, suffers from problems such as excessively large internal pores and weak support capacity. Summary of the Invention

[0007] The purpose of this invention is to provide an extra-large offshore steel pipe composite pile and its construction method to solve the problems mentioned in the background art.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0009] This invention provides an extra-large offshore steel pipe composite pile, comprising: a composite steel pipe pile; a steel casing disposed outside the composite steel pipe pile; a composite pile platform plate installed on top of the steel casing; and a steel pipe assembly and positioning structure installed inside the composite pile platform plate and disposed outside the composite steel pipe pile.

[0010] The steel pipe assembly and positioning structure includes: an embedded metal collar installed and fixed outside the composite pile platform plate and located inside the steel casing; a honeycomb reinforcement component installed outside the embedded metal collar and connected to the composite pile platform plate; an embedded metal rod installed inside the honeycomb reinforcement component and extending into the composite pile platform plate; and an extrusion reinforcement component installed inside the embedded metal rod and extending into the outer wall of the composite steel pipe pile.

[0011] Multiple embedded metal rods and extrusion reinforcement components are provided.

[0012] As a preferred embodiment of the present invention, the interior of the composite steel pipe pile is filled from top to bottom with a wave-filled mud zone, a Shanghai sea surface-filled mud zone, a seawater tidal range-filled mud zone, a seawater fully immersed mud zone, and a seabed-filled mud zone.

[0013] The wave-filled mud zone is located on one side inside the composite pile platform plate and extends to the bottom of the composite pile platform plate, while the embedded metal collar is fitted on the outside of the wave-filled mud zone.

[0014] In a preferred embodiment of the present invention, the steel casing is provided with two partitions inside, a composite steel pipe pile is provided on the top of the partitions, a lower foundation pile seat located at the bottom of the partitions is installed at the bottom of the inner side of the steel casing, a composite steel pipe pile is installed on the inner side of the lower foundation pile seat, and a seabed filling mud zone is provided on the inner side of the lower foundation pile seat.

[0015] The steel casing has a mud reinforcement layer on the inner side between the two partitions, and the mud reinforcement layer is placed on the outside of the composite steel pipe pile.

[0016] In a preferred embodiment of the present invention, the composite pile platform plate is composed of an upper platform metal plate at the top and a lower platform metal plate at the bottom. The upper platform metal plate and the lower platform metal plate are welded and fixed together. A plurality of downward pressing metal columns located outside the composite steel pipe pile are installed at the bottom of the upper platform metal plate, and the downward pressing metal columns extend into the interior of the extrusion reinforcement component.

[0017] The lower platform metal plate has an embedded metal rod running through its interior, and the bottom of the lower platform metal plate is fixed with an embedded metal collar by screws.

[0018] As a preferred embodiment of the present invention, the honeycomb reinforcement component includes: an L-shaped side positioning metal block installed and fixed on the outside of the inner embedded metal collar and abutting against the outer wall of the composite steel pipe pile; an oblique honeycomb metal rod installed on the outside of the L-shaped side positioning metal block; connecting seats installed on the left and right sides of the oblique honeycomb metal rod; a protruding metal seat welded and fixed to the connecting seats and connected to the outside of the inner embedded metal collar; and a lower support metal block disposed at the bottom of the protruding metal seat.

[0019] The lower support metal block has an embedded metal rod fixed to its inner side, which is located on the inner side of the outer wall of the embedded metal collar.

[0020] In a preferred embodiment of the present invention, the bottom of the lower support metal block protrudes inward and forms an extending protrusion, the extending protrusion extending into the interior of the inner groove, the inner groove being formed on the outer wall of the bottom of the embedded metal collar.

[0021] The inclined honeycomb metal rods are provided in multiple ways, and the multiple inclined honeycomb metal rods form a honeycomb shape on the outside of the composite steel pipe pile.

[0022] As a preferred embodiment of the present invention, the extrusion reinforcement assembly includes: a horizontal groove formed inside the embedded metal rod; a horizontal metal rod slidably connected to the horizontal groove and extending to the outside; a first spring connected to the top outside of the horizontal metal rod and abutting against the outside of the embedded metal rod; an arc-shaped extrusion metal block connected to the side of the first spring and abutting against the outer wall of the composite steel pipe pile; guide sliders installed on both sides of the bottom of the arc-shaped extrusion metal block and slidably connected to the embedded metal rod; a damping groove formed at the top of the horizontal metal rod; an upper seat body connected to the damping groove and slidably connected to the embedded metal rod; and a second spring connected to the bottom outside of the upper seat body and installed inside the embedded metal rod.

[0023] The top of the upper body is connected to a downward-pressing metal column.

[0024] This invention also provides a construction method for extra-large offshore steel pipe composite piles, comprising the following steps:

[0025] S1. Processing of steel casing for composite steel pipe piles: When laying composite steel pipe piles, the first step is to lay out the composite steel pipe piles and erect the platform, and then install and fix the steel casing for the composite steel pipe piles at the bottom of the platform.

[0026] S2. Selection of drilling equipment: According to the pile foundation design drawings and engineering geological data, the assembly position of the composite steel pipe piles is drilled using the air-lift reverse circulation drilling method. The drilling equipment selected is a reverse circulation drilling machine and an impact drilling machine.

[0027] S3. Construction sequence of steel pipe composite piles: According to the overall construction organization plan, before the trestle bridge is completed, the pile foundation construction will proceed from the large mileage to the small mileage. After the trestle bridge is completed, the main pier pile foundation construction will begin, advancing from both ends to the middle. Among them, there are 8 individual composite steel pipe piles, and the rest are single piles and single columns of composite steel pipe piles. The single row of composite steel pipe piles is set to 2.

[0028] S4. Grouting of steel pipe composite piles: The entire grouting system consists of a mud pump, steel casing, and mud purification system. The mud is directly produced inside the composite steel pipe pile. A steel sedimentation tank is used for mud treatment. The mud properties are fine-tuned according to the soil lithology to ensure the stability of the borehole wall. During the drilling process of the rotary drilling rig, the mud is extracted by air lift reverse circulation, passes through a soil separation screen, and is then filtered by a mud purifier. Qualified mud is discharged into the mud circulation tank for reuse.

[0029] As a preferred embodiment of the present invention, in step S4, the grouting of the composite steel pipe pile includes the following steps:

[0030] S1. Mud Selection: High-quality polyacrylamide bentonite mud is used. Due to its high viscosity, the mud is jelly-like when at rest. When the mud returns to stillness, its viscosity recovers, which helps to suspend the drill cuttings and prevent them from sinking. When the drill bit moves and the mud flows, the structure of the mud is changed to reduce its viscosity and increase its fluidity, thereby reducing the resistance of the drill bit.

[0031] S2. Raw materials for pulping: Bentonite is used for pulping, and calcium-sodium-based bentonite with montmorillonite as the main component is selected to ensure that the soil has good dispersibility, suspension and pulping properties, and the quality grade reaches the second grade standard; fresh water is used for pulping; industrial sodium carbonate is selected as the dispersant to provide Na+ and modify the calcium soil.

[0032] S3. Hydrolysis of polyacrylamide: Select anionic, non-hydrolyzable polyacrylamide with a molecular weight of 8 million. Before use, the polyacrylamide should be hydrolyzed at room temperature for 2-3 days. During hydrolysis, the ratio of PAM:NaOH:H2O = 10:1.15:700 should be used in a stirring tank until PAM is completely dispersed in water. Let it stand for 2-3 days before use.

[0033] S4. PHP mud preparation: Add PHP to the raw mud and mix them thoroughly. The amount of PHP used depends on the actual mud performance indicators tested.

[0034] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:

[0035] 1. In the construction of extra-large offshore steel pipe composite piles and their methods, when steel pipe composite piles are embedded and erected in the ocean to achieve bridge foundation laying operations, the composite steel pipe piles assembled inside are installed and fixed through a honeycomb structure of interlaced embedded metal rods and L-shaped side positioning metal blocks, as well as multiple oblique honeycomb metal rods set on the outside of the embedded metal rods. This ensures the strength, stability, and firmness of the inner embedded metal ring when the composite steel pipe pile is installed inside. Simultaneously, when the pile is subjected to impact during use, the structure can effectively reduce the concentration of local stress in the pile, improving the pile's bearing capacity by 30%-50% and reducing settlement by 20%-40%. Furthermore, the honeycomb modular assembly allows for quick and convenient installation, shortening the construction cycle by 15%-25% compared to traditional methods.

[0036] 2. In the construction methods of extra-large offshore steel pipe composite piles, multiple zones are set up inside the composite steel pipe pile according to the specific conditions of the marine laying. The amount of mud injected into each zone is determined according to its location on the seabed. This ensures that the mud in each zone will not generate a large number of voids after solidification, thereby improving the strength and stability of the internal support structure of the composite steel pipe pile after solidification. Furthermore, when the mud solidifies inside the composite steel pipe pile, the steel casing on the outside of the composite steel pipe pile and the mud reinforcement layer on the inside of the steel casing provide lateral support for the composite steel pipe pile, ensuring its stability in the assembled state. On the other hand, it protects the mud in the solidified state, reducing the impact of different temperatures and pressures at different depths on the solidified mud.

[0037] 3. In the construction methods of extra-large offshore steel pipe composite piles, when assembling and fixing the composite steel pipe piles, the top of the composite steel pipe piles can be assembled by installing a metal plate on the outer side of the top of the composite steel pipe pile, thus achieving the connection between the composite steel pipe piles. Simultaneously, during assembly, the bottom-connected pressing metal column can be installed into the embedded metal rod, limiting and fixing the arc-shaped extrusion metal block that compresses the composite steel pipe pile, ensuring the stability and firmness of the arc-shaped extrusion metal block when compressing and fixing the composite steel pipe pile. Furthermore, when the composite steel pipe pile is compressed and fixed by the arc-shaped extrusion metal block, a first spring is provided in the connecting part. By controlling and adjusting the compression of the first spring, the strength and firmness of the arc-shaped extrusion metal block when compressing and fixing the composite steel pipe pile can be guaranteed.

[0038] 4. In the construction of extra-large offshore steel pipe composite piles and their construction methods, when assembling and fixing the composite steel pipe piles, by setting a rubber inner ring on the outside of the composite steel pipe pile through an arc-shaped inner groove, and the rubber inner ring abutting against the inner wall of the embedded metal collar, the friction strength of the connection between the embedded metal collar and the composite steel pipe pile and the supporting connection effect of the assembly can be effectively enhanced. This reduces the problem of misalignment between the embedded metal collar and the composite steel pipe pile caused by the injection and solidification of mud and the violent flow of seawater (in the initial stage of assembling the composite steel pipe pile), ensuring the normal and stable progress of the subsequent assembly and fixing of the composite steel pipe pile. Attached Figure Description

[0039] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0040] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0041] Figure 1 This is a schematic diagram of the main structure after the entire assembly of the present invention is completed;

[0042] Figure 2 This is a cross-sectional view of the structure after the entire assembly of the present invention is completed;

[0043] Figure 3 This is a schematic diagram of the overall structure of the present invention after assembly;

[0044] Figure 4 This is an exploded view of the connection between the steel casing and the composite pile platform plate of the present invention.

[0045] Figure 5 This is a top view of the connection between the composite steel pipe pile and the steel pipe assembly and positioning structure of the present invention;

[0046] Figure 6 This is a schematic diagram of the steel pipe assembly and positioning structure of the present invention;

[0047] Figure 7 This is a schematic diagram of the structure of the present invention, showing the connection between the embedded metal collar and the honeycomb reinforcement component;

[0048] Figure 8 This is a schematic diagram of the structure connecting the embedded metal rod and the extrusion reinforcement component of the present invention;

[0049] Figure 9 This is a schematic diagram of the cross-sectional view of the connection between the embedded metal rod and the extrusion reinforcement component of the present invention;

[0050] Figure 10 This is the present invention. Figure 9 Enlarged structural diagram of region A in the middle;

[0051] Figure 11 This is a schematic diagram of the connection between the horizontal metal rod and the arc-shaped extruded metal block of the present invention;

[0052] Figure 12 This is an exploded view of the cross-section of the composite steel pipe pile and steel casing of the present invention;

[0053] Figure 13 This is a sequence diagram of the assembly of the composite steel pipe pile of the present invention onto the composite pile platform plate;

[0054] Figure 14 This is a numerical diagram of the grouting mud used for grouting composite steel pipe piles according to the present invention;

[0055] In the picture:

[0056] 10. Composite steel pipe piles; 101. Wave-filled mud zone; 102. Shanghai sea surface-filled mud zone; 103. Tidal range-filled mud zone; 104. Fully immersed seawater-filled mud zone; 105. Seabed-filled mud zone;

[0057] 20. Steel casing; 201. Divider plate; 202. Lower foundation pile base; 203. Mud slurry reinforcement layer;

[0058] 30. Composite pile platform plate; 301. Upper platform metal plate; 302. Lower platform metal plate; 303. Lower pressing metal column;

[0059] 40. Steel pipe assembly and positioning structure; 401. Embedded metal collar; 402. Honeycomb reinforcement component; 403. Embedded metal rod; 404. Extrusion reinforcement component;

[0060] 4021, L-shaped side positioning metal block; 4022, oblique honeycomb metal rod; 4023, connecting seat; 4024, raised metal seat; 4025, lower support metal block; 40251, extension protrusion; 40252, inner groove;

[0061] 4041, Horizontal groove; 4042, Horizontal metal rod; 4043, First spring; 4044, Arc-shaped extruded metal block; 4045, Guide slider; 4046, Damping groove; 4047, Upper seat; 4048, Second spring;

[0062] 50. Arc-shaped inner groove; 501. Rubber inner ring. Detailed Implementation

[0063] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0064] Example 1

[0065] Please see Figures 1-12 A super-large offshore steel pipe composite pile includes a composite steel pipe pile 10; a steel casing 20 disposed on the outside of the composite steel pipe pile 10; a composite pile platform plate 30 installed on the top of the steel casing 20; and a steel pipe assembly and positioning structure 40 installed inside the composite pile platform plate 30 and disposed on the outside of the composite steel pipe pile 10. The steel pipe assembly and positioning structure 40 includes: an inner embedded metal collar 401 installed and fixed on the outside of the composite pile platform plate 30 and disposed on the inside of the steel casing 20; a honeycomb reinforcement component 402 installed on the outside of the inner embedded metal collar 401 and connected to the composite pile platform plate 30; an embedded metal rod 403 installed on the inside of the honeycomb reinforcement component 402 and extending into the interior of the composite pile platform plate 30; and a compression reinforcement component 404 installed inside the embedded metal rod 403 and extending into the outer wall of the composite steel pipe pile 10. Multiple embedded metal rods 403 and compression reinforcement components 404 are provided.

[0066] The working principle described above is as follows: When constructing and assembling the composite steel pipe pile 10, a deep pit is first drilled and excavated on the seabed for installing the composite steel pipe pile 10. The composite steel pipe pile 10 is then buried inside the excavated pit. Simultaneously, a steel casing 20, positioned outside the composite steel pipe pile 10, is buried into the seabed. After the steel casing 20 and the composite steel pipe pile 10 are buried, the composite pile platform plate 30 is assembled onto the top of the steel casing 20 and the outer side of the top of the composite steel pipe pile 10, completing the assembly and fixation of the composite steel pipe pile 10 and the composite pile platform plate 30. At this point, when assembling the composite steel pipe pile 10 inside the composite pile platform plate 30, the embedded metal collar 401 works in conjunction with the outer honeycomb reinforcement component 402 to ensure the stability of the assembly and fixation of the composite steel pipe pile 10 and the composite pile platform plate 30. Meanwhile, when assembling and fixing the composite pile platform plate 30, the top composite pile platform plate 30 can extend into the interior of the extrusion reinforcement component 404 and limit and fix the extrusion reinforcement component 404 for extruding and fixing the composite steel pipe pile 10, ensuring the firmness of the composite steel pipe pile 10 when extruding and fixing it.

[0067] For details, please refer to the following: Figure 2The interior of the composite steel pipe pile 10 is filled from top to bottom with a wave-filled mud zone 101, a Shanghai sea surface-filled mud zone 102, a seawater tidal range-filled mud zone 103, a seawater fully immersed mud zone 104, and a seabed-filled mud zone 105. The wave-filled mud zone 101 is located on one side inside the composite pile platform plate 30 and extends to the bottom of the composite pile platform plate 30. A metal collar 401 is embedded inside and fitted on the outside of the wave-filled mud zone 101.

[0068] In the extra-large offshore steel pipe composite pile of the present invention, by setting up a wave-filled mud zone 101, a Shanghai sea surface-filled mud zone 102, a seawater tidal range-filled mud zone 103, a seawater fully immersed mud zone 104, and a seabed-filled mud zone 105 inside the composite steel pipe pile 10, mud of different densities can be filled according to the position of the composite steel pipe pile 10 in the ocean. This ensures that when the mud at each position is solidified in the seabed, it is not easy for problems such as voids to occur in the mud due to different pressures, thereby improving the strength of the mud inside the composite steel pipe pile 10 after solidification.

[0069] For details, please refer to the following: Figure 2 and Figure 4 The steel casing 20 has two partitions 201 inside. The top of the partitions 201 is equipped with composite steel pipe piles 10. The bottom of the inner side of the steel casing 20 is equipped with a lower foundation pile seat 202 located at the bottom of the partitions 201. The inner side of the lower foundation pile seat 202 is equipped with composite steel pipe piles 10. The inner side of the lower foundation pile seat 202 is equipped with a seabed filling mud zone 105. The inner side of the steel casing 20 located between the two partitions 201 is equipped with a mud reinforcement layer 203. The mud reinforcement layer 203 is located outside the composite steel pipe piles 10.

[0070] In the extra-large offshore steel pipe composite pile of the present invention, the design of the mud reinforcement layer 203 can improve the strength of the composite steel pipe pile 10 and the steel casing 20 after assembly and connection, and protect the mud in the solidified and supported state inside.

[0071] For details, please refer to the following: Figure 3 and Figure 4 The composite pile platform plate 30 is composed of an upper platform metal plate 301 at the top and a lower platform metal plate 302 at the bottom. The upper platform metal plate 301 and the lower platform metal plate 302 are welded and fixed. Multiple pressing metal columns 303 located outside the composite steel pipe pile 10 are installed at the bottom of the upper platform metal plate 301. The pressing metal columns 303 extend into the interior of the extrusion reinforcement component 404. An embedded metal rod 403 is installed through the interior of the lower platform metal plate 302. An embedded metal collar 401 is installed and fixed at the bottom of the lower platform metal plate 302 by screws.

[0072] In the extra-large offshore steel pipe composite pile of the present invention, when the upper platform metal plate 301 is welded and fixed to the top of the lower platform metal plate 302, the assembly of the upper platform metal plate 301 will drive the bottom pressure metal column 303 to extend into the interior of the embedded metal rod 403, and limit and fix the compression reinforcement component 404 provided inside the embedded metal rod 403.

[0073] For details, please refer to the following: Figure 6 and Figure 7 The honeycomb reinforcement component 402 includes: an L-shaped side positioning metal block 4021 installed and fixed on the outside of the inner embedded metal collar 401 and abutting against the outer wall of the composite steel pipe pile 10; an oblique honeycomb metal rod 4022 installed on the outside of the L-shaped side positioning metal block 4021; a connecting seat 4023 installed on the left and right sides of the oblique honeycomb metal rod 4022; a raised metal seat 4024 welded and fixed to the connecting seat 4023 and connected to the outside of the inner embedded metal collar 401; and a lower support metal block 4025 disposed at the bottom of the raised metal seat 4024, wherein an embedded metal rod 403 located on the inner side of the outer wall of the inner embedded metal collar 401 is installed and fixed on the inner side of the lower support metal block 4025.

[0074] In this invention, the bottom of the lower support metal block 4025 protrudes inward and forms an extension protrusion 40251. The extension protrusion 40251 extends into the interior of the inner groove 40252. The inner groove 40252 is opened on the outer wall of the bottom of the embedded metal collar 401. Multiple inclined honeycomb metal rods 4022 are provided, and the multiple inclined honeycomb metal rods 4022 form a honeycomb shape on the outside of the composite steel pipe pile 10.

[0075] In the extra-large offshore steel pipe composite pile of the present invention, when assembling the composite steel pipe pile 10 and the internally embedded metal collar 401, multiple oblique honeycomb metal rods 4022 can be stably and firmly assembled on the outside of the composite steel pipe pile 10 by means of multiple staggered L-shaped side positioning metal blocks 4021 and embedded metal rods 403. At the same time, the multiple oblique honeycomb metal rods 4022 can form a honeycomb shape, and the honeycomb structure improves the installation and support strength of the composite steel pipe pile 10 installed inside.

[0076] In this invention, the stability and firmness of the installation of multiple lower support metal blocks 4025 can be ensured by embedding and installing the lower support metal blocks 4025.

[0077] For details, please refer to the following: Figure 8 , Figure 9 , Figure 10 and Figure 11The extrusion reinforcement assembly 404 includes: a horizontal groove 4041 formed inside the embedded metal rod 403; a horizontal metal rod 4042 slidably connected to the horizontal groove 4041 and extending to the outside; a first spring 4043 connected to the top outside of the horizontal metal rod 4042 and abutting against the outside of the embedded metal rod 403; an arc-shaped extrusion metal block 4044 connected to the side of the first spring 4043 and abutting against the outer wall of the composite steel pipe pile 10; guide sliders 4045 installed on both sides of the bottom of the arc-shaped extrusion metal block 4044 and slidably connected to the embedded metal rod 403; a damping groove 4046 formed at the top of the horizontal metal rod 4042; an upper seat 4047 connected to the damping groove 4046 and slidably connected to the embedded metal rod 403; and a second spring 4048 connected to the bottom outside of the upper seat 4047 and installed inside the embedded metal rod 403, wherein a downward pressing metal column 303 is connected to the top of the upper seat 4047.

[0078] In the extra-large offshore steel pipe composite pile of the present invention, the first spring 4043 is compressed according to the strength tested and experimented with, ensuring that the elasticity of the first spring 4043 can support the arc-shaped extrusion metal block 4044 installed on its side to abut against the outside of the composite steel pipe pile 10, and the composite steel pipe pile 10 is elastically extruded and fixed by the first spring 4043. Then, after the pressing metal column 303 extends into the interior of the upper seat 4047, it extrudes the upper seat 4047 downward and drives the rod at the bottom of the upper seat 4047 into the damping groove 4046 opened at the top of the horizontal metal rod 4042. The friction generated by the extrusion and abutment between the damping groove 4046 and the upper seat 4047 limits and fixes the position of the horizontal metal rod 4042, ensuring that the arc-shaped extrusion metal block 4044 connected to the side of the horizontal metal rod 4042 by the first spring 4043 can stably abut against the outside of the composite steel pipe pile 10.

[0079] Example 2

[0080] Please see Figures 1-14 A construction method for extra-large offshore steel pipe composite piles includes the following steps:

[0081] S1. Processing of steel casing 20 for composite steel pipe pile 10: When laying composite steel pipe pile 10, first lay out the composite steel pipe pile 10 and set up the platform, and install and fix the steel casing 20 of composite steel pipe pile 10 at the bottom of the platform.

[0082] S2. Selection of drilling equipment: According to the pile foundation design drawings and engineering geological data, the assembly position of the composite steel pipe pile 10 is drilled by air lift reverse circulation drilling. The drilling equipment selected is reverse circulation drilling machine and impact drilling machine.

[0083] S3. Construction sequence of steel pipe composite piles: According to the overall construction organization plan, before the trestle bridge is completed, the pile foundation construction will proceed from the large mileage to the small mileage. After the trestle bridge is completed, the main pier pile foundation construction will begin, advancing from both ends to the middle. Among them, there are 8 individual composite steel pipe piles 10, and the rest are single piles and single columns of composite steel pipe piles 10. There are 2 composite steel pipe piles 10 in a single row.

[0084] S4. Grouting of steel pipe composite piles: The entire grouting system consists of a mud pump, a steel casing 20, and a mud purification system. The mud is directly produced inside the composite steel pipe pile 10. A steel sedimentation tank is used for mud treatment. The mud properties are finely adjusted according to the soil lithology to ensure the stability of the borehole wall. During the drilling process of the rotary drilling rig, the mud is extracted by air lift reverse circulation, passes through a soil separation screen, and is then filtered by a mud purifier. Qualified mud is discharged into the mud circulation tank for reuse.

[0085] It should be noted that in S4, the grouting of the composite steel pipe pile 10 includes the following steps:

[0086] S1. Mud Selection: High-quality polyacrylamide bentonite mud is used. Due to its high viscosity, the mud is jelly-like when at rest. When the mud returns to stillness, its viscosity recovers, which helps to suspend the drill cuttings and prevent them from sinking. When the drill bit moves and the mud flows, the structure of the mud is changed to reduce its viscosity and increase its fluidity, thereby reducing the resistance of the drill bit.

[0087] S2. Raw materials for pulping: Bentonite is used for pulping, and calcium-sodium-based bentonite with montmorillonite as the main component is selected to ensure that the soil has good dispersibility, suspension and pulping properties, and the quality grade reaches the second grade standard; fresh water is used for pulping; industrial sodium carbonate is selected as the dispersant to provide Na+ and modify the calcium soil.

[0088] S3. Hydrolysis of polyacrylamide: Select anionic, non-hydrolyzable polyacrylamide with a molecular weight of 8 million. Before use, the polyacrylamide should be hydrolyzed at room temperature for 2-3 days. During hydrolysis, the ratio of PAM:NaOH:H2O = 10:1.15:700 should be used in a stirring tank until PAM is completely dispersed in water. Let it stand for 2-3 days before use.

[0089] S4. PHP mud preparation: Add PHP to the raw mud and mix them thoroughly. The amount of PHP used depends on the actual mud performance indicators tested.

[0090] Example 3

[0091] For details, please refer to the following: Figure 12 An arc-shaped inner groove 50 is provided on the outer side of the top of the composite steel pipe pile 10. A rubber inner ring 501 is connected inside the arc-shaped inner groove 50. The rubber inner ring 501 is installed inside the embedded metal collar 401.

[0092] In the extra-large offshore steel pipe composite pile of the present invention, the design of the rubber inner ring 501 improves the curvature and friction strength of the connection between the composite steel pipe pile 10 and the inner embedded metal collar 401 during assembly, and limits the inner embedded metal collar 401 and the composite steel pipe pile 10 in the assembled connection state, so as to improve the stability and firmness of the inner embedded metal collar 401 and the composite steel pipe pile 10 during connection assembly.

[0093] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0094] The terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention.

[0095] Therefore, any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this invention, based on the technical solution and inventive concept of this invention, should be covered within the protection scope of this invention.

Claims

1. A super-large offshore steel pipe composite pile, characterized in that, include: Composite steel pipe pile (10); steel casing (20) set outside the composite steel pipe pile (10); composite pile platform plate (30) installed on top of the steel casing (20); steel pipe assembly positioning structure (40) installed inside the composite pile platform plate (30) and set outside the composite steel pipe pile (10). The steel pipe assembly positioning structure (40) includes: an inner embedded metal collar (401) installed and fixed outside the composite pile platform plate (30) and located inside the steel casing (20); a honeycomb reinforcement component (402) installed outside the inner embedded metal collar (401) and connected to the composite pile platform plate (30); an embedded metal rod (403) installed inside the honeycomb reinforcement component (402) and extending into the composite pile platform plate (30); and an extrusion reinforcement component (404) installed inside the embedded metal rod (403) and extending into the outer wall of the composite steel pipe pile (10). The embedded metal rod (403) and the extrusion reinforcement component (404) are provided in multiple ways; The composite pile platform plate (30) is composed of an upper platform metal plate (301) at the top and a lower platform metal plate (302) at the bottom. The upper platform metal plate (301) and the lower platform metal plate (302) are welded and fixed. At the bottom of the upper platform metal plate (301), a plurality of downward pressing metal columns (303) located outside the composite steel pipe pile (10) are installed. The downward pressing metal columns (303) extend into the interior of the extrusion reinforcement component (404). The lower platform metal plate (302) has an embedded metal rod (403) that runs through its interior, and the bottom of the lower platform metal plate (302) is fixed with an embedded metal collar (401) by screws. The honeycomb reinforcement component (402) includes: an L-shaped side positioning metal block (4021) installed and fixed on the outside of the inner embedded metal collar (401) and abutting against the outer wall of the composite steel pipe pile (10); an oblique honeycomb metal rod (4022) installed on the outside of the L-shaped side positioning metal block (4021); a connecting seat (4023) installed on the left and right sides of the oblique honeycomb metal rod (4022); a raised metal seat (4024) welded and fixed to the connecting seat (4023) and connected to the outside of the inner embedded metal collar (401); and a lower support metal block (4025) disposed at the bottom of the raised metal seat (4024). Among them, the inner side of the lower support metal block (4025) is fixed with an embedded metal rod (403) located on the inner side of the outer wall of the inner embedded metal collar (401). Multiple inclined honeycomb metal rods (4022) are provided, and the multiple inclined honeycomb metal rods (4022) form a honeycomb shape on the outside of the composite steel pipe pile (10); The extrusion reinforcement assembly (404) includes: a horizontal groove (4041) formed inside the embedded metal rod (403); a horizontal metal rod (4042) slidably connected to the horizontal groove (4041) and extending to the outside; a first spring (4043) connected to the top outside of the horizontal metal rod (4042) and abutting against the outside of the embedded metal rod (403); and an arc-shaped extrusion metal block (4043) connected to the side of the first spring (4043) and abutting against the outer wall of the composite steel pipe pile (10). 44); guide sliders (4045) installed on both sides of the bottom of the arc-shaped extruded metal block (4044) and slidably connected to the embedded metal rod (403); damping grooves (4046) formed on the top of the horizontal metal rod (4042); upper seat (4047) connected to the damping groove (4046) and slidably connected to the embedded metal rod (403); second spring (4048) connected to the bottom outside of the upper seat (4047) and installed inside the embedded metal rod (403). The top of the upper body (4047) is connected to a pressing metal column (303).

2. The extra-large offshore steel pipe composite pile according to claim 1, characterized in that: The interior of the composite steel pipe pile (10) is filled from top to bottom with a wave-filled mud zone (101), a Shanghai sea surface-filled mud zone (102), a seawater tidal range-filled mud zone (103), a seawater fully immersed mud zone (104), and a seabed-filled mud zone (105). The wave-filled mud zone (101) is located on one side inside the composite pile platform plate (30) and extends to the bottom of the composite pile platform plate (30). The embedded metal collar (401) is sleeved on the outside of the wave-filled mud zone (101).

3. The extra-large offshore steel pipe composite pile according to claim 2, characterized in that: The steel casing (20) is provided with two partitions (201) inside. The top of the partitions (201) is provided with composite steel pipe piles (10). The bottom of the steel casing (20) is provided with a lower foundation pile seat (202) located at the bottom of the partitions (201). The inner side of the lower foundation pile seat (202) is provided with composite steel pipe piles (10). The inner side of the lower foundation pile seat (202) is provided with a seabed filling mud zone (105). The steel casing (20) is provided with a mud reinforcement layer (203) on the inner side between the two partitions (201), and the mud reinforcement layer (203) is provided on the outside of the composite steel pipe pile (10).

4. The extra-large offshore steel pipe composite pile according to claim 1, characterized in that: The bottom of the lower support metal block (4025) protrudes inward and forms an extension protrusion (40251), which extends into the interior of the inner groove (40252), which is located on the outer wall of the bottom of the embedded metal collar (401).

5. A construction method for an extra-large offshore steel pipe composite pile, specifically for the extra-large offshore steel pipe composite pile described in any one of claims 1-4, characterized in that... Includes the following steps: S1. Steel casing (20) for composite steel pipe pile (10): When laying composite steel pipe pile (10), first lay out the composite steel pipe pile (10) and set up the platform, and install the steel casing (20) for assembling the composite steel pipe pile (10) at the bottom of the platform. S2. Selection of drilling equipment: According to the pile foundation design drawings and engineering geological data, the assembly position of the composite steel pipe pile (10) is drilled by air lift reverse circulation drilling. The drilling equipment selected is reverse circulation drilling machine and impact drilling machine. S3. Construction sequence of steel pipe composite piles: According to the overall construction organization arrangement, before the trestle bridge is completed, the pile foundation construction is carried out from the large mileage to the small mileage. After the trestle bridge is completed, the main pier pile foundation construction begins, advancing from both ends to the middle. Among them, the number of individual composite steel pipe piles (10) is 8, and the rest are single piles and single columns of composite steel pipe piles (10). The number of single-row composite steel pipe piles (10) is set to 2. S4. Grouting of steel pipe composite piles: The entire grouting system consists of a mud pump, a steel casing (20), and a mud purification system. The mud is directly made inside the composite steel pipe pile (10). A steel sedimentation tank is used for mud treatment. The mud properties are finely adjusted according to the soil lithology to meet the main goal of the soil hole wall stability. During the drilling process of the rotary drilling rig, the mud is extracted by air lift reverse circulation, passes through a soil separation screen, and is then filtered by a mud purifier. Qualified mud is discharged into the mud circulation tank for reuse.

6. The construction method for an extra-large offshore steel pipe composite pile according to claim 5, characterized in that: In S4, the grouting of the composite steel pipe pile (10) includes the following steps: S1. Mud Selection: High-quality polyacrylamide bentonite mud is used. Due to its high viscosity, the mud is jelly-like when at rest. When the mud returns to stillness, its viscosity recovers, which helps to suspend the drill cuttings and prevent them from sinking. When the drill bit moves and the mud flows, the structure of the mud is changed to reduce its viscosity and increase its fluidity, thereby reducing the resistance of the drill bit. S2. Raw materials for pulping: Bentonite is used for pulping, and calcium-sodium-based bentonite with montmorillonite as the main component is selected to ensure that the soil has good dispersibility, suspension and pulping properties, and the quality grade reaches the second grade standard; fresh water is used for pulping; industrial sodium carbonate is selected as the dispersant to provide Na+ and modify the calcium soil. S3. Hydrolysis of polyacrylamide: Select anionic, non-hydrolyzable polyacrylamide with a molecular weight of 8 million. Before use, the polyacrylamide should be hydrolyzed at room temperature for 2-3 days. During hydrolysis, the ratio of PAM:NaOH:H2O = 10:1.15:700 should be used in a stirring tank until PAM is completely dispersed in water. Let it stand for 2-3 days before use. S4. PHP mud preparation: Add PHP to the raw mud and mix them thoroughly. The amount of PHP used depends on the actual mud performance indicators tested.

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