Super-huge offshore steel pipe composite pile and construction method thereof

Abstract

The invention discloses a super-huge offshore steel pipe composite pile and a construction method thereof, relates to the technical field of composite piles, and solves the problems that when a steel pipe composite pile is assembled and fixed, fixing points are limited, operation is not convenient enough, and stability and firmness are poor. The oversize offshore steel pipe composite pile comprises a composite steel pipe pile, the steel casing is arranged on the outer side of the composite steel pipe pile; the composite pile platform plate is mounted at the top of the steel casing; and the steel pipe assembling and positioning structure is mounted in the composite pile platform plate and arranged on the outer side of the composite steel pipe pile. According to the honeycomb-shaped steel pipe composite pile, on one hand, the strength, stability and firmness of the assembled steel pipe composite pile can be improved through the honeycomb-shaped structure; and on the other hand, the steel pipe composite piles are assembled and fixed through staggered arrangement, so that the space arrangement can be improved when the steel pipe composite piles are assembled and fixed, and the maximum supporting and fixing effect is achieved with the minimum space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite piles, in particular to a super-large offshore steel pipe composite pile and a construction method thereof. BACKGROUND

[0002] Ocean engineering refers to a new, reconstruction, expansion project whose main body is located on the sea side of the coastline for the purpose of developing, utilizing, protecting and restoring marine resources. When a bridge in ocean engineering is built, the bottom pile structure for building the bridge needs to be constructed.

[0003] The steel pipe composite pile is a key foundation structure in ocean engineering, mainly used for the construction of major facilities such as cross-sea bridges and offshore wind power. Its core feature is to combine the high strength of steel pipe piles with the corrosion resistance of composite materials to adapt to complex marine environments.

[0004] However, the steel pipe composite pile has the following defects in actual use: 1. When the existing steel pipe composite pile is built and laid on the marine environment and supports the bridge structure on the top, in order to ensure the safety of the bridge building and laying, the steel pipe composite pile supporting the bridge needs to be stably and firmly assembled on the seabed. At this time, the traditional steel pipe composite pile building scheme is to excavate the seabed soil and mud layer by drilling and bury the steel pipe composite pile deep into the excavated seabed to realize the building of the steel pipe composite pile. However, the connection between the traditional steel pipe composite pile and the top platform is generally fixed by large bolts or welding. The former is limited in fixing points and not convenient to operate. After fixing, transportation and installation are complex and tedious, making it difficult to transport to the sea for construction; 2. After the existing steel pipe composite pile is installed in the seabed installation area, in order to ensure the stability and firmness of the installation, mud needs to be filled in the steel pipe composite pile to improve the overall support capacity of the steel pipe composite pile. The traditional way is to use a pump group to push the mud into the interior of the steel pipe composite pile. However, due to the actual use environment of the steel pipe composite pile (most of the bottom of the steel pipe composite pile is located on the seabed), the mud has the problems of large internal pores and weak support capacity after solidification. SUMMARY

[0005] The present application relates to the technical field of composite piles, in particular to a super-large offshore steel pipe composite pile and a construction method thereof.

[0006] To achieve the above-mentioned application purposes, the present application adopts the following technical solutions: The application provides a super large offshore steel pipe composite pile, which 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, a steel pipe assembly positioning structure installed inside the composite pile platform plate and arranged outside the composite steel pipe pile, The steel pipe assembly positioning structure comprises an embedded metal collar fixedly installed outside the composite pile platform plate and arranged inside the steel casing, a honeycomb reinforcing assembly installed outside the embedded metal collar and connected with the composite pile platform plate, an embedded metal rod installed inside the honeycomb reinforcing assembly and extending to the inside of the composite pile platform plate, and an extrusion reinforcing assembly installed inside the embedded metal rod and extending to the outer wall of the composite steel pipe pile, The embedded metal rod and the extrusion reinforcing assembly are provided with a plurality of metal rods.

[0007] As a preferred scheme of the application, the inside of the composite steel pipe pile is sequentially filled from top to bottom with a wave filling mud area, a Shanghai offshore filling mud area, a seawater tidal difference filling mud area, a seawater full immersion filling mud area and a seabed filling mud area, The wave filling mud area is arranged on one side of the inside of the composite pile platform plate and extends to the bottom of the composite pile platform plate, and the embedded metal collar is arranged outside the wave filling mud area.

[0008] As a preferred scheme of the application, the inside of the steel casing is provided with two partitions, the top of the partitions is provided with the composite steel pipe pile, the inner bottom of the steel casing is provided with a lower foundation pile base at the bottom of the partitions, the inside of the lower foundation pile base is provided with the composite steel pipe pile, and the inside of the lower foundation pile base is provided with a seabed filling mud area, The inside of the steel casing between the two partitions is provided with a mud reinforcing layer, and the mud reinforcing layer is arranged outside the composite steel pipe pile.

[0009] As a preferred scheme of the application, the composite pile platform plate is composed of an upper platform metal plate arranged at the top and a lower platform metal plate arranged at the bottom, the upper platform metal plate and the lower platform metal plate are welded and fixed to form, the bottom of the upper platform metal plate is provided with a plurality of downward pressing metal columns arranged outside the composite steel pipe pile, and the downward pressing metal columns extend to the inside of the extrusion reinforcing assembly, The inside of the lower platform metal plate is provided with the embedded metal rod, and the bottom of the lower platform metal plate is provided with the embedded metal collar fixed by screws.

[0010] As a preferred scheme of the present application, the honeycomb reinforcing assembly comprises: an L-shaped side positioning metal block fixedly installed outside the embedded metal sleeve and abutting against the outer wall of the composite steel pipe pile; a slanting honeycomb metal rod installed outside the L-shaped side positioning metal block; a connecting seat installed on both sides of the slanting honeycomb metal rod; a protruding metal seat fixedly welded with the connecting seat and connected outside the embedded metal sleeve; a lower supporting metal block arranged at the bottom of the protruding metal seat, Wherein, the inner side of the lower supporting metal block is fixedly installed with an embedded metal rod located inside the outer wall of the embedded metal sleeve.

[0011] As a preferred scheme of the present application, the bottom of the lower supporting metal block protrudes inwardly and constitutes an extension protrusion, the extension protrusion extends to the inside of an inner groove arranged at the outer wall of the bottom of the embedded metal sleeve, Wherein, a plurality of slanting honeycomb metal rods are arranged, and the plurality of slanting honeycomb metal rods constitute a honeycomb shape outside the composite steel pipe pile.

[0012] As a preferred scheme of the present application, the extrusion reinforcing assembly comprises: a horizontal groove arranged inside the embedded metal rod; a horizontal metal rod in sliding connection with the horizontal groove and extending to the outside; a first spring connected outside the top of the horizontal metal rod and abutting against the outside of the embedded metal rod; an arc-shaped extrusion metal block connected on the side of the first spring and abutting against the outer wall of the composite steel pipe pile; a guide sliding block installed on both sides of the bottom of the arc-shaped extrusion metal block and in sliding connection with the embedded metal rod; a damping groove arranged at the top of the horizontal metal rod; an upper seat body connected with the damping groove and in sliding connection with the embedded metal rod; a second spring connected outside the bottom of the upper seat body and installed inside the embedded metal rod, Wherein, the top of the upper seat body is connected with a pressing metal column.

[0013] The present application also provides a construction method of the super large offshore steel pipe composite pile, comprising the following steps: S1, steel casing processing for the composite steel pipe pile: when the laying construction of the composite steel pipe pile is performed, first, the lofting and platform erection of the composite steel pipe pile are performed, and the steel casing for assembling the composite steel pipe pile is fixedly installed at the bottom of the platform of the composite steel pipe pile; S2, selection of drilling equipment: according to the pile foundation design drawing and engineering geological data, the drilling equipment of reverse circulation drilling machine and percussion drilling machine is selected for drilling treatment on the assembly position of the composite steel pipe pile in the air-lift reverse circulation drilling hole mode; S3, steel pipe composite pile construction sequence: according to the overall construction organization arrangement, before the trestle is connected, the pile foundation is constructed according to the direction from the large mileage to the small mileage, after the trestle is connected, the main pier pile foundation starts to be constructed, and the construction is pushed forward from both ends to the middle, wherein the number of single composite steel pipe pile is 8, the rest are single pile composite steel pipe piles, and the single row composite steel pipe pile is arranged as 2. S4, steel pipe composite pile grouting: the mud pump, the steel casing and the mud purification system constitute the whole grouting system, the mud is directly made in the inside of the composite steel pipe pile, the steel sedimentation tank is used for mud treatment, wherein the mud performance is adjusted according to the lithology of the soil layer, so that the stability of the soil layer hole wall is mainly met, in the hole forming process of the rotary drilling machine, the mud is extracted through the soil residue separation screen by air lifting reverse circulation, and then filtered through the mud purifier, and the qualified mud is discharged to the mud circulating pool for repeated use.

[0014] As a preferred scheme of the present application, in the S4, the composite steel pipe pile grouting comprises the following steps: S1, mud selection: high-quality polyacrylamide bentonite mud is used, the viscosity of the mud is large, and in the static state, the mud is jelly-like, the viscosity of the mud is restored when the mud flows from the static state, the suspension effect of the mud is prevented, when the drill bit is drilled, the structure of the mud is changed, the viscosity of the mud is reduced, and the fluidity is increased, so that the drill bit resistance is reduced; S2, raw materials for mud preparation: bentonite is used for mud preparation, calcium sodium based bentonite mainly containing montmorillonite is selected, so that the soil has good dispersion and suspension and mud making property, and the quality grade reaches the second level standard; fresh water is used for mud preparation; industrial sodium carbonate is selected for Na+, and the calcium soil is modified; S3, hydrolysis of polyacrylamide: anion, non-hydrolyzed, polyacrylamide with a molecular weight of 8 million is selected, wherein the polyacrylamide is hydrolyzed by the normal temperature method 2-3 days in advance before use, the hydrolysis is carried out in the stirring cylinder according to the ratio of PAM: NaOH: H2O = 10: 1.15: 700, and stirring is carried out until the PAM is fully dispersed in the water, and the PAM is used after being placed for 2-3 days; S4, PHP mud preparation: PHP is added to the original mud to fully stir and mix, and the amount of PHP is determined according to the actual test mud performance index.

[0015] Compared with the prior art, the above one or more technical schemes have the following beneficial effects: 1. In the super large offshore steel pipe composite pile and its construction method, when the steel pipe composite pile is embedded and built into the sea to realize the laying operation of the bridge foundation, through the staggered arrangement of the embedded metal rod and the L-shaped side positioning metal block, and the arrangement of multiple inclined honeycomb metal rods outside the embedded metal rod, the composite steel pipe pile assembled inside the inclined honeycomb metal rod structure can be installed and fixed, ensuring the strength, stability and firmness of the embedded metal sleeve when the composite steel pipe pile is installed inside the embedded metal sleeve. At the same time, when the pile body is impacted during use, the structure can effectively reduce the concentration of local stress of the pile body, improve the bearing capacity of the pile body, which can be improved by 30%-50%, and the settlement amount is reduced by 20%-40%. And the modular assembly of the honeycomb structure is quick and convenient to install, and the construction period is shortened by 15%-25% compared with the traditional method; 2. In the super large offshore steel pipe composite pile and its construction method, by arranging multiple areas inside the composite steel pipe pile according to the specific conditions of the sea laying, and the mud content injected in each area is injected according to the position on the seabed, it is ensured that the mud in each part of the area will not produce a large number of holes after solidification, and the strength and firmness of the internal support structure of the composite steel pipe pile after solidification are improved. And when the mud is solidified in the composite steel pipe pile, the steel casing outside the composite steel pipe pile and the mud reinforcement layer structure inside the steel casing can support the composite steel pipe pile on one side, ensuring the stability of the composite steel pipe pile in the assembled state. On the other hand, it can protect the mud in the solidified state, reduce the influence of different depths of the seabed temperature and pressure on the mud in the solidified state; 3. In the super large offshore steel pipe composite pile and its construction method, when the composite steel pipe pile is assembled and fixed, by installing the upper platform metal plate on the top outside of the composite steel pipe pile, the top of the composite steel pipe pile can be assembled to realize the connection of the composite steel pipe pile and the composite steel pipe pile. At the same time, the lower pressing metal column connected at the bottom can be installed into the embedded metal rod to limit and fix the arc-shaped extrusion metal block that extrudes the composite steel pipe pile, ensuring the stability and firmness of the arc-shaped extrusion metal block when extruding and fixing the composite steel pipe pile. And when the arc-shaped extrusion metal block extrudes and fixes the composite steel pipe pile, the connecting part is provided with a first spring, and by controlling and adjusting the compression amount of the first spring, the strength and firmness of the arc-shaped extrusion metal block when extruding and fixing the composite steel pipe pile can be ensured; 4. In the super large offshore steel pipe composite pile and its construction method, when the composite steel pipe pile is assembled and fixed, the rubber inner ring is arranged on the outer side of the composite steel pipe pile through the arc-shaped inner groove, and the rubber inner ring abuts against the inner wall of the embedded metal sleeve, so that the friction strength of the connection part of the embedded metal sleeve and the composite steel pipe pile and the support connection effect of the assembly are effectively enhanced, the problems (in the initial stage of assembling the composite steel pipe pile) that the embedded metal sleeve and the composite steel pipe pile are dislocated due to the injection and solidification of mud and the violent flow of seawater are reduced, and the subsequent assembly and fixation of the composite steel pipe pile are ensured to be normally and stably performed. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein for explanation by referring to the embodiments.

[0017] In addition, the terms "mount", "arrange", "provide with", "connect", "be connected", "sleeve connect" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two devices, elements or components. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0018] Figure 1 is a structure schematic view of the main view after the overall assembly of the present application is completed; Figure 2 is a structure schematic view of the overall assembly of the present application after the overall assembly of the present application is completed; Figure 3 is a structure schematic view of the overall assembly of the present application after the overall assembly of the present application is completed; Figure 4 is an exploded view of the steel casing and the composite pile platform plate connection of the present application after the section is cut; Figure 5 is a structure schematic view of the composite steel pipe pile and the steel pipe assembly positioning structure connection of the present application from the top view; Figure 6 is a structure schematic view of the steel pipe assembly positioning structure of the present application; Figure 7 is a structure schematic view of the embedded metal sleeve and the honeycomb reinforcing assembly connection of the present application; Figure 8 is a structure schematic view of the embedded metal rod and the extrusion reinforcing assembly connection of the present application; Figure 9 is a structure schematic view of the embedded metal rod and the extrusion reinforcing assembly connection of the present application after the section is cut; Figure 10 is a structure schematic view of the embedded metal rod and the extrusion reinforcing assembly connection of the present application after the section is cut; Figure 9The structure schematic diagram of the enlarged middle A area; Figure 11 The structure schematic diagram of the horizontal metal rod and the arc-shaped extruded metal block connection of the present application; Figure 12 The exploded view of the composite steel pipe pile and the steel casing connection section after the section is cut open; Figure 13 The sequence diagram of the composite steel pipe pile assembled to the composite pile platform plate of the present application; Figure 14 The numerical diagram of the mud for the composite steel pipe pile grouting of the present application; In the figure: 10, composite steel pipe pile; 101, wave filling mud area; 102, Shanghai ocean surface filling mud area; 103, seawater tidal difference filling mud area; 104, seawater full immersion filling mud area; 105, seabed filling mud area; 20, steel casing; 201, partition plate; 202, lower foundation pile base; 203, mud reinforcement layer; 30, composite pile platform plate; 301, upper platform metal plate; 302, lower platform metal plate; 303, lower pressing metal column; 40, steel pipe assembly positioning structure; 401, embedded metal collar; 402, honeycomb reinforcement assembly; 403, embedded metal rod; 404, extruded reinforcement assembly; 4021, L-shaped side positioning metal block; 4022, oblique honeycomb metal rod; 4023, connecting seat; 4024, protruding metal seat; 4025, lower supporting metal block; 40251, extension protrusion; 40252, inner recess; 4041, horizontal recess; 4042, horizontal metal rod; 4043, first spring; 4044, arc-shaped extruded metal block; 4045, guide sliding block; 4046, damping recess; 4047, upper seat body; 4048, second spring; 50, arc-shaped inner groove; 501, rubber inner ring. DETAILED DESCRIPTION

[0019] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0020] Embodiment one Please refer to Figures 1-12The application discloses a super-large offshore steel pipe composite pile which comprises a composite steel pipe pile 10, a steel casing 20 arranged outside the composite steel pipe pile 10, a composite pile platform plate 30 installed at the top of the steel casing 20, and a steel pipe assembly positioning structure 40 installed inside the composite pile platform plate 30 and arranged outside the composite steel pipe pile 10, wherein the steel pipe assembly positioning structure 40 comprises an embedded metal collar 401 fixedly installed outside the composite pile platform plate 30 and arranged inside the steel casing 20, a honeycomb reinforcing assembly 402 installed outside the embedded metal collar 401 and connected with the composite pile platform plate 30, an embedded metal rod 403 installed inside the honeycomb reinforcing assembly 402 and extending to the inside of the composite pile platform plate 30, and an extrusion reinforcing assembly 404 installed inside the embedded metal rod 403 and extending to the outer wall of the composite steel pipe pile 10, wherein the embedded metal rod 403 and the extrusion reinforcing assembly 404 are provided with a plurality of metal rods.

[0021] The working principle is as follows: when the composite steel pipe pile 10 is built and assembled, a seabed deep pit for installing the composite steel pipe pile 10 is drilled and excavated, and the composite steel pipe pile 10 is buried in the excavated deep pit, wherein when the composite steel pipe pile 10 is buried, the steel casing 20 arranged outside the composite steel pipe pile 10 is synchronously buried to the seabed. After the steel casing 20 and the composite steel pipe pile 10 are completely buried, the composite pile platform plate 30 is assembled to the top of the steel casing 20 and the outside of the top of the composite steel pipe pile 10, and the assembly and fixation of the composite steel pipe pile 10 and the composite pile platform plate 30 are completed. At this time, when the composite steel pipe pile 10 is assembled inside the composite pile platform plate 30, the embedded metal collar 401 can cooperate with the outside honeycomb reinforcing assembly 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 the composite pile platform plate 30 is assembled and fixed, the top composite pile platform plate 30 can extend to the inside of the extrusion reinforcing assembly 404, and the extrusion reinforcing assembly 404 for extrusion fixing the composite steel pipe pile 10 is limited and fixed, so that the firmness of the extrusion fixing of the composite steel pipe pile 10 is ensured.

[0022] Specifically referring to Figure 2 The inside of the composite steel pipe pile 10 is sequentially filled from top to bottom with a wave filling mud area 101, a Shanghai offshore surface filling mud area 102, a seawater tidal difference filling mud area 103, a seawater full immersion filling mud area 104 and a seabed filling mud area 105, wherein the wave filling mud area 101 is arranged at one side of the inside of the composite pile platform plate 30 and extends to the bottom of the composite pile platform plate 30, and the embedded metal collar 401 is sleeved outside the wave filling mud area 101.

[0023] In the super-large offshore steel pipe composite pile, the mud filling areas 101, 102, 103, 104 and 105 are arranged in the composite steel pipe pile 10, and muds with different densities are filled according to the positions of the composite steel pipe pile 10 in the sea, so that the muds in each position are not prone to cavitation and other problems caused by different pressures when the muds are solidified in the seabed, and the strength of the mud in the composite steel pipe pile 10 after solidification is improved.

[0024] With reference to Figure 2 and Figure 4 The inside of the steel casing 20 is provided with two partitions 201, the top of the partition 201 is provided with the composite steel pipe pile 10, the bottom of the steel casing 20 is provided with the lower foundation pile base 202 located at the bottom of the partition 201, the inner side of the lower foundation pile base 202 is provided with the composite steel pipe pile 10, and the inner side of the lower foundation pile base 202 is provided with the seabed mud filling area 105.

[0025] In the super-large offshore steel pipe composite pile, the strength of the composite steel pipe pile 10 and the steel casing 20 after assembly and connection is improved, and the mud in the internal solidification and support state is protected.

[0026] With reference to Figure 3 and Figure 4 The composite pile platform plate 30 is composed of the upper platform metal plate 301 arranged at the top and the lower platform metal plate 302 arranged at the bottom, the upper platform metal plate 301 and the lower platform metal plate 302 are welded and fixed to form, the bottom of the upper platform metal plate 301 is provided with a plurality of lower pressing metal columns 303 located outside the composite steel pipe pile 10, the lower pressing metal columns 303 extend to the inside of the extrusion reinforcing assembly 404, and the inside of the lower platform metal plate 302 is provided with the embedded metal rod 403.

[0027] In the super-large offshore steel pipe composite pile, 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 drives the lower pressing metal columns 303 arranged at the bottom to extend to the inside of the embedded metal rod 403, and the extrusion reinforcing assembly 404 arranged in the embedded metal rod 403 is limited and fixed.

[0028] With reference to Figure 6 and Figure 7The cellular reinforcing assembly 402 comprises: an L-shaped side positioning metal block 4021 fixedly installed outside the embedded metal collar 401 and abutting against the outer wall of the composite steel pipe pile 10; a slanting cellular metal rod 4022 installed outside the L-shaped side positioning metal block 4021; a connecting seat 4023 installed on the left and right sides of the slanting cellular metal rod 4022; a protruding metal seat 4024 welded and fixed with the connecting seat 4023 and connected outside the embedded metal collar 401; and a lower supporting metal block 4025 arranged at the bottom of the protruding metal seat 4024, wherein the inner side of the lower supporting metal block 4025 is fixedly installed with an embedded metal rod 403 inside the outer wall of the embedded metal collar 401.

[0029] In the present application, the bottom of the lower supporting metal block 4025 protrudes inwardly and forms an extension protrusion 40251, the extension protrusion 40251 extends to the inside of an inner recess 40252 formed at the bottom of the outer wall of the embedded metal collar 401, and the slanting cellular metal rod 4022 is provided with a plurality of slanting cellular metal rods 4022 arranged in a cellular manner outside the composite steel pipe pile 10.

[0030] In the present application, when the composite steel pipe pile 10 and the embedded metal collar 401 are assembled, the plurality of slanting cellular metal rods 4022 can be stably and firmly assembled outside the composite steel pipe pile 10 by the staggered arrangement of the plurality of L-shaped side positioning metal blocks 4021 and the embedded metal rod 403. Meanwhile, the plurality of slanting cellular metal rods 4022 can form a cellular structure to improve the installation and supporting strength of the composite steel pipe pile 10 installed therein.

[0031] In the present application, the embedded installation of the lower supporting metal block 4025 can ensure the stability and firmness of the installation of the plurality of lower supporting metal blocks 4025.

[0032] With reference to the drawings Figure 8 , Figure 9 , Figure 10 and Figure 11The extrusion reinforcing assembly 404 comprises a horizontal groove 4041 formed in the embedded metal rod 403, a horizontal metal rod 4042 in sliding connection with the horizontal groove 4041 and extending to the outside, a first spring 4043 connected to the top 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, a guide sliding block 4045 mounted to the bottom of the arc-shaped extrusion metal block 4044 and in sliding connection with the embedded metal rod 403, a damping groove 4046 formed in the top of the horizontal metal rod 4042, an upper seat body 4047 connected with the damping groove 4046 and in sliding connection with the embedded metal rod 403, and a second spring 4048 connected to the outside of the bottom of the upper seat body 4047 and mounted in the embedded metal rod 403, wherein the top of the upper seat body 4047 is connected with the downward pressing metal column 303.

[0033] In the super large offshore steel pipe composite pile, according to the strength during actual test and experiment, the first spring 4043 is compressed to ensure that the elasticity of the first spring 4043 can support the arc-shaped extrusion metal block 4044 mounted on the 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, when the downward pressing metal column 303 extends into the inside of the upper seat body 4047 and extrudes the upper seat body 4047 to move downward, the rod body at the bottom of the upper seat body 4047 enters the damping groove 4046 formed in the top of the horizontal metal rod 4042, the position of the horizontal metal rod 4042 is limited and fixed by the friction force generated by the extrusion and abutment of the damping groove 4046 and the upper seat body 4047, and it is ensured that the arc-shaped extrusion metal block 4044 connected with the first spring 4043 on the side of the horizontal metal rod 4042 can stably abut against the outside of the composite steel pipe pile 10.

[0034] Embodiment two Please refer to Figures 1-14 A construction method of the super large offshore steel pipe composite pile, comprising the following steps: S1, the composite steel pipe pile 10 is processed with the steel casing 20: when the laying construction of the composite steel pipe pile 10 is performed, the lofting and platform erection of the composite steel pipe pile 10 are first performed, and the steel casing 20 for assembling and fixing the composite steel pipe pile 10 is installed at the bottom of the platform of the composite steel pipe pile 10; S2, the drilling equipment is selected: according to the pile foundation design drawing and the engineering geological data, the drilling equipment is selected as the reverse circulation drilling machine and the impact drilling machine to perform the drilling treatment on the assembly position of the composite steel pipe pile 10 in the air-lift reverse circulation drilling mode; S3, Steel pipe composite pile construction sequence: according to the overall construction organization arrangement, before the trestle is connected, the pile foundation is constructed according to the direction from the large mileage to the small mileage, after the trestle is connected, the main pier pile foundation starts to be constructed, and the construction is pushed forward from both ends to the middle, wherein the number of single composite steel pipe pile 10 is 8, the rest are single pile composite steel pipe piles 10, and the single row composite steel pipe pile 10 is arranged as 2. S4, Steel pipe composite pile grouting: the mud pump, the steel casing 20 and the mud purification system constitute the whole grouting system, the mud is directly made in the inside of the composite steel pipe pile 10, the steel sedimentation tank is used for mud treatment, wherein the mud performance is adjusted according to the lithology of the soil layer, so as to meet the main target of the stability of the soil layer hole wall, in the hole forming process of the rotary drilling machine, the mud is extracted by air lifting reverse circulation through the soil residue separation screen, and then filtered through the mud purifier, and the qualified mud is discharged to the mud circulating pool for repeated use.

[0035] It should be noted 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, the viscosity of the mud is large, and in the static state, it is jelly-like, the viscosity of the mud is restored when the mud changes from flowing to static, the suspension effect of the mud is restored, and the sinking of the drilling residue is prevented; when the drill bit is drilled, the structure of the mud is changed, the viscosity of the mud is reduced, and the fluidity is increased, so that the drilling resistance is reduced; S2, raw materials for mud making: bentonite is used for mud making, calcium and sodium based bentonite mainly containing montmorillonite is selected to ensure that the soil has good dispersion and suspension and mud making properties, and the quality grade reaches the second level standard; fresh water is used for mud making; industrial sodium carbonate is selected for Na+, and the calcium soil is modified; S3, hydrolysis of polyacrylamide: anionic, non-hydrolyzed, polyacrylamide with a molecular weight of 8 million is selected, wherein the polyacrylamide is hydrolyzed in advance for 2-3 days before use by using the normal temperature method, the ratio of PAM: NaOH: H2O is 10: 1.15: 700 during hydrolysis, stirring is carried out in the stirring cylinder until the PAM is fully dispersed in water, and the PAM is used after being placed for 2-3 days; S4, PHP mud preparation: PHP is added to the original mud to fully stir and mix them, and the amount of PHP is determined according to the actual test mud performance index.

[0036] Example three Specific reference Figure 12 An arc-shaped inner groove 50 is arranged outside the top of the composite steel pipe pile 10, an inner rubber ring 501 is connected inside the arc-shaped inner groove 50, and the inner rubber ring 501 is installed inside the inner embedded metal sleeve ring 401.

[0037] In the super-large offshore steel pipe composite pile of the present application, the rubber inner ring 501 is designed to improve the curvature and friction strength of the connection between the composite steel pipe pile 10 and the embedded metal collar 401 during assembly, and the embedded metal collar 401 and the composite steel pipe pile 10 in the assembled state are limited to improve the stability and firmness of the connection between the embedded metal collar 401 and the composite steel pipe pile 10 during assembly.

[0038] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

[0039] The terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only a simplified description for the convenience of describing the present application, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0040] Therefore, any skilled person in the art can make equivalent replacements or changes to the technical solutions and inventive concepts of the present application within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application.

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.

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 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.

5. A super-large offshore steel pipe composite pile according to claim 1, characterized in that: 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). The lower support metal block (4025) has an embedded metal rod (403) fixed on the inner side of the outer wall of the inner embedded metal collar (401).

6. A super-large offshore steel pipe composite pile according to claim 5, characterized in that: 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), which is located on the outer wall of the bottom of the embedded metal collar (401). The inclined honeycomb metal rods (4022) are provided in multiple ways, and the multiple inclined honeycomb metal rods (4022) form a honeycomb shape on the outside of the composite steel pipe pile (10).

7. A super-large offshore steel pipe composite pile according to claim 4, characterized in that: 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).

8. A construction method for an extra-large offshore steel pipe composite pile, relating to the extra-large offshore steel pipe composite pile as described in any one of claims 1-7, 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.

9. The construction method for an extra-large offshore steel pipe composite pile according to claim 8, 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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