A combined structure of special-shaped steel pipe piles for complex seabed topography

Abstract

The present application relates to the technical field of ocean engineering, and discloses a special-shaped steel pipe pile combined structure for complex seabed topography, which comprises a plurality of steel pipe pile bodies and a seabed detector, the side surfaces of the steel pipe pile bodies are provided with lock catch connecting mechanisms, the lock catch connecting mechanisms are used for locking and connecting the steel pipe pile bodies two by two, the inner sides of the steel pipe pile bodies are provided with surrounding purlin frames, the seabed detector is internally provided with a detection system, and the detection system comprises: a multi-beam depth sounding module, which is used for acquiring three-dimensional topographic data of the seabed; an acoustic disturbance emission module, which is used for emitting acoustic disturbance pulses to target points of the seabed; and a tracking imaging sonar module, which is used for collecting a dynamic response image sequence of the seabed caused by the acoustic disturbance pulses. The present application combines in-situ fine investigation with differentiated design of structures, realizes on-demand distribution of engineering materials, reduces engineering cost under the premise of ensuring the safety of the structure, and improves construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of marine engineering technology, specifically to a composite structure of irregularly shaped steel pipe piles designed for complex seabed topography. Background Technology

[0002] In marine engineering, such as land reclamation, wharf construction, or the construction of bridge piers for cross-sea bridges, steel pipe piles or steel sheet piles are commonly used to construct temporary cofferdams or breakwaters.

[0003] Currently, the design and construction of such composite structures presupposes an investigation of the seabed geological conditions at the project site. Traditional design processes typically rely on limited, discrete point-based investigation methods such as borehole sampling or static cone penetration testing (CPT). However, seabed geological conditions often exhibit spatial variability, making it difficult to accurately reflect the true distribution of seabed mechanical properties by inferring the geological conditions of the entire project area based solely on data from a few investigation points. This lack of investigation precision directly prevents designers from implementing refined and differentiated structural designs, thus creating potential risks to the project's reliability.

[0004] To compensate for insufficient survey data and ensure structural safety, the engineering community generally adopts a conservative and standardized design approach. This involves using the worst geological conditions revealed at the survey points as the design benchmark for the entire composite structure, and then applying a large safety factor on top of that. This design method results in all steel pipe piles used in the entire project being manufactured to uniform, highest-specification dimensions (such as pile length and wall thickness). While this approach ensures the safety of the structure at its weakest points, it constitutes significant over-design in areas with better geological conditions. This not only leads to a huge waste of steel resources but also increases the costs of materials, transportation, and pile driving construction, resulting in low overall economic efficiency.

[0005] Furthermore, in the on-site construction phase, traditional steel pipe pile connections typically rely on relatively simple locking mechanisms. However, alignment and insertion are difficult in underwater environments, requiring high precision and resulting in low construction efficiency. Especially in harsh sea conditions, prolonged underwater operations not only increase construction risks but also further drive up project time costs. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a composite structure of irregularly shaped steel pipe piles for complex seabed terrain. This solves the technical problems in existing technologies, such as low matching degree between structural design and actual seabed geological conditions due to insufficient survey accuracy, and the need to improve on-site installation efficiency and connection reliability.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a composite structure of irregularly shaped steel pipe piles for complex seabed terrain, comprising multiple steel pipe piles and a seabed detector. Each of the multiple steel pipe piles has a locking mechanism on its side, which is used to connect and lock the multiple steel pipe piles together in pairs. A waler frame is provided on the inner side of each of the multiple steel pipe piles. The seabed detector has a built-in detection system, which includes: Multibeam bathymetry module, used to acquire three-dimensional topographic data of the seabed; Acoustic disturbance transmission module, used to transmit acoustic disturbance pulses to target points on the seabed; The tracking imaging sonar module is used to acquire a sequence of dynamic response images of the seabed triggered by the acoustic disturbance pulses; The data fusion and interpretation module is electrically connected to the multibeam echo sounding module, the acoustic disturbance emission module, and the tracking imaging sonar module. The data fusion and interpretation module is used to process the dynamic response image sequence collected from multiple target points and combine it with the three-dimensional terrain data to generate a distribution map characterizing the seabed geomechanical properties. The steel pipe pile is prefabricated based on the data of the distribution map.

[0008] In one specific embodiment, the data fusion and interpretation module is configured as follows: Based on the dynamic response image sequence acquired at each target point, the shear wave propagation velocity of the target point is calculated, and the shear modulus of the target point is calculated as a geomechanical parameter based on the shear wave propagation velocity. The shear modulus calculated from multiple target points is then registered with the three-dimensional terrain data to generate the distribution map.

[0009] Among them, the propagation speed of shear waves The calculation process includes: selecting a spatial distance of... Extract the corresponding time signals from the two points in the dynamic response image sequence. and Calculate the cross-correlation function of the two signals. : ; in: To delay time, The symbol is for integrals.

[0010] By determining the cross-correlation function Delay time to reach the maximum value As the propagation time of the shear wave Then the propagation speed of the shear wave can be calculated. : ; The shear modulus is calculated according to the following formula: ; in: Shear modulus; The density of the surface medium of the seabed; The shear wave propagation speed is calculated by processing the dynamic response image sequence.

[0011] Preferably, the data fusion and interpretation module internally includes a perturbation strategy control unit. The perturbation strategy control unit is used to adaptively adjust the energy of the acoustic perturbation pulse emitted by the acoustic perturbation emission module to the next target point based on the signal quality of the dynamic response image sequence acquired at a certain target point. Its control logic can be expressed as follows: ; in: The energy to be emitted at the next target point; The launch energy at the current target point; The signal-to-noise ratio of the signal obtained at the current target point; The preset target signal-to-noise ratio range; This is the control function.

[0012] Furthermore, the adaptive adjustment specifically involves: when the signal quality is lower than a preset threshold, instructing the acoustic disturbance emission module to increase the energy; and when the signal quality is higher than the preset threshold, instructing the acoustic disturbance emission module to decrease the energy.

[0013] In another preferred embodiment, the data fusion and interpretation module includes a noise sampling unit. The noise sampling unit is used to instruct the tracking imaging sonar module to acquire a sequence of background noise images of the target point before the acoustic disturbance emission module emits the acoustic disturbance pulse toward any of the target points.

[0014] Furthermore, the data fusion and interpretation module is configured to: utilize the background noise image sequence For the dynamic response image sequence Filtering is performed to remove background noise, resulting in a clean image sequence. This filtering process can be expressed by the following formula: ; in, This is the preset filtering algorithm.

[0015] Preferably, the locking connection mechanism includes a butt plate and a C-shaped plate. The butt plate and the C-shaped plate are respectively fixedly connected to both sides of the steel pipe pile. A leaf spring is provided inside the C-shaped plate, and a pressure plate is fixedly connected to the side of the leaf spring. The pressure plate is slidably connected inside the C-shaped plate, and the pressure plate is in contact with the butt plate. Both the pressure plate and the butt plate are provided with friction-reinforcing components on the contacting side.

[0016] Furthermore, the friction strengthening component includes an adhesion layer, a functional layer, and a sealing layer. The adhesion layer is a nickel-aluminum alloy coating and is disposed on one side of the pressure plate and the mating plate. The functional layer is a tungsten carbide cobalt cermet coating and is disposed on the outside of the adhesion layer. The sealing layer is a penetrating epoxy sealant coating and is disposed on the outside of the functional layer.

[0017] In one specific embodiment, a positioning post is fixedly connected to the side of the docking plate, and a positioning groove is opened inside the C-shaped plate, with the positioning post slidably connected inside the positioning groove.

[0018] In another specific embodiment, a guide plate is fixedly connected inside the C-shaped plate, and a guide groove is provided on the side of the docking plate.

[0019] This invention provides a composite structure of irregularly shaped steel pipe piles for complex seabed terrain. It offers the following advantages: 1. This invention achieves high-resolution in-situ exploration of seabed geomechanical properties through an integrated seabed detector and generates a distribution map that is precisely registered with three-dimensional topographic data. Based on the data of this distribution map, steel pipe piles are prefabricated, so that the design of the steel pipe piles can be precisely matched with the actual geological conditions of each pile location, avoiding redundancy or deficiencies in traditional designs and improving the rationality of structural design.

[0020] 2. The detection system designed in this invention has the functions of adaptively adjusting the emission energy and actively sampling background noise. The former ensures that high-quality response signals can be obtained under geological conditions of different hardness, while the latter effectively eliminates environmental noise interference. Together, they ensure the quality and reliability of the exploration data.

[0021] 3. The locking connection mechanism of the present invention achieves rapid temporary self-locking during the installation process through the structure of leaf spring and pressure plate, shortens the offshore operation window, improves work efficiency, and, combined with the friction-enhancing component coating, forms a multi-locking mechanism to ensure the long-term reliability of the connection. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention; Figure 2This is a schematic diagram of the steel pipe pile body of the present invention; Figure 3 This is a schematic diagram of the C-shaped plate of the present invention; Figure 4 This is a schematic cross-sectional view of the structure of the butt plate and pressure plate portions of the present invention; Figure 5 This is a schematic diagram of the structure of the seabed detector according to an embodiment of the present invention; Figure 6 This is a bottom view of the seabed detector according to an embodiment of the present invention; Figure 7 This is a block diagram of the detection system architecture according to an embodiment of the present invention.

[0023] Among them, 1. Steel pipe pile body; 2. Seabed detector; 201. Multibeam bathymetry module; 202. Acoustic disturbance emission module; 203. Tracking imaging sonar module; 3. Waler frame; 4. Docking plate; 5. C-shaped plate; 6. Leaf spring; 7. Pressure plate; 8. Friction strengthening component; 801. Adhesion layer; 802. Functional layer; 803. Sealing layer; 9. Positioning post; 10. Positioning groove; 11. Guide plate; 12. Guide groove. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see the appendix Figure 1 -Appendix Figure 7 This invention provides a composite structure of irregularly shaped steel pipe piles for complex seabed terrain, comprising multiple steel pipe piles 1 and a seabed detector 2. Each of the steel pipe piles 1 has a locking mechanism on its side, used to connect and lock the piles in pairs. A waler frame 3 is provided on the inner side of each pile. The seabed detector 2 has a built-in detection system, which includes: Multibeam bathymetry module 201 is used to acquire three-dimensional topographic data of the seabed; Acoustic disturbance transmitting module 202 is used to transmit acoustic disturbance pulses to target points on the seabed; The tracking imaging sonar module 203 is used to acquire a sequence of dynamic response images of the seabed caused by acoustic disturbance pulses; The data fusion and interpretation module is electrically connected to the multibeam bathymetry module 201, the acoustic disturbance emission module 202, and the tracking imaging sonar module 203. The data fusion and interpretation module is used to process the dynamic response image sequence collected from multiple target points and combine it with three-dimensional terrain data to generate a distribution map characterizing the geomechanical properties of the seabed. The steel pipe pile 1 is prefabricated based on the data of the distribution map.

[0026] Specifically, multiple steel pipe piles 1 are interconnected to form a closed or semi-closed structure with a predetermined outline, such as for constructing a cofferdam or the foundation of large equipment. The seabed detector 2 is an independent equipment unit used to conduct geological surveys of the designated construction area before the design and installation of the steel pipe piles 1. The waler frame 3 is installed within the internal space enclosed by the multiple steel pipe piles 1 to provide structural support for the combined structure.

[0027] Each of the multiple steel pipe piles 1 has a locking connection mechanism on its side. This locking connection mechanism is used to mechanically connect and lock two adjacent steel pipe piles 1 to form a continuous, integral structure. Each steel pipe pile 1 is prefabricated based on the distribution map data generated by the seabed probe 2.

[0028] Specifically, the seabed probe 2 outputs a distribution map characterizing the geomechanical properties of the seabed, which contains quantitative information on the geomechanical parameters at various locations in the target sea area. Based on this information, designers accurately calculate the specific dimensions of the steel pipe piles required for each pile location, such as pile length, wall thickness, or the configuration of reinforcing ribs. Therefore, in the combined structure, the dimensional parameters of the multiple steel pipe piles 1 vary according to the geological conditions of their respective locations, exhibiting a non-uniform characteristic.

[0029] The waler frame 3, serving as an internal support structure, connects to the inner walls of all the steel pipe piles 1, forming an integrated load-bearing system. This structure is used to transfer and distribute external loads such as soil and water pressure among the different steel pipe piles, enhancing the overall composite structure's ability to resist external loads.

[0030] In one specific embodiment, a corbel structure is pre-installed on the inner wall of the steel pipe pile 1, and the end of the waler frame 3 is attached to the corbel structure and fixedly connected by high-strength bolts or on-site welding.

[0031] Please see the appendix Figure 7 In this embodiment, the seabed probe 2 is specifically embodied as an underwater vehicle platform, such as a remotely operated vehicle (ROV) or an autonomous underwater vehicle (AUV). This underwater vehicle platform has its own power, navigation, and control systems.

[0032] The hardware modules of the detection system are directly integrated into the structure of the underwater platform. The detection system includes a multibeam bathymetry module 201, an acoustic disturbance emission module 202, a tracking imaging sonar module 203, and a data fusion and interpretation module.

[0033] The multibeam echo sounder module 201, acoustic disturbance emission module 202, and tracking imaging sonar module 203, as external sensor units, are mounted on the external frame of the underwater vehicle platform and configured to face the seabed. The data fusion and interpretation module is located inside the pressure-resistant electronics compartment of the underwater vehicle platform.

[0034] All modules share a unified power supply unit and clock synchronization system provided by the underwater vehicle platform to ensure consistent time reference for data acquisition. The multibeam echo sounder module 201, the acoustic disturbance emission module 202, and the tracking imaging sonar module 203 are all electrically connected to and exchange data with the data fusion and interpretation module through an internal data bus.

[0035] The data fusion and interpretation module, as the control and processing core of the entire detection system, is responsible for sending command signals to the other three modules and receiving the data they collect and return.

[0036] Specifically, the data fusion and interpretation module sends a trigger signal and energy setting parameters to the acoustic disturbance transmission module 202, sends a synchronous acquisition command to the tracking imaging sonar module 203, and simultaneously receives terrain data streams and image sequence data streams from the multibeam echo sounding module 201 and the tracking imaging sonar module 203, respectively.

[0037] In this embodiment, the data fusion and interpretation module is an embedded industrial computer system, which includes a central processing unit (CPU), a graphics processing unit (GPU), random access memory (RAM), and a solid-state drive (SSD).

[0038] The graphics processing unit (GPU) is used to process image sequence data in parallel to meet real-time computing requirements. This module also integrates an external communication interface for exporting the final generated distribution map data in real-time or after the mission is completed via the communication link of the underwater platform.

[0039] The function of the multibeam bathymetry module 201 is to perform high-resolution seabed topographic and geomorphological measurements and provide an accurate three-dimensional spatial reference for subsequent geomechanical performance parameters.

[0040] In one specific embodiment, the multibeam echo sounder module 201 includes a transmitting transducer array and a receiving transducer array. During operation, the transmitting transducer array emits a wide-sector (e.g., 120-degree) acoustic pulse toward the seabed perpendicular to the direction of navigation of the underwater vehicle platform. This acoustic pulse forms a narrow illumination area on the seabed.

[0041] After the acoustic pulse is reflected by the seabed, its echo is received by a receiving transducer array. The receiving transducer array uses beamforming technology to simultaneously form multiple (e.g., 256 or 512) narrow receiving beams within a wide fan-shaped illumination area. For each individual receiving beam, the system can accurately measure the round-trip propagation time of the sound wave from transmission to reception, as well as the precise angle of that beam relative to the receiving transducer array.

[0042] The data fusion and interpretation module converts the round-trip propagation time of each received beam into the slant distance from the transducer to the seabed reflection point based on the propagation speed profile data of sound waves in the water.

[0043] The propagation speed profile data of sound waves in water can be obtained by using a sound velocity profiler (SVP) to conduct one or more measurements in the work area before the start of the exploration operation. The measurement data is input into the data fusion and interpretation module to perform refraction correction on the propagation path of the sound waves in order to improve the depth sounding accuracy.

[0044] By combining the beam's angle information, the underwater vehicle platform's attitude data (roll, pitch, heading), and position data (provided by the underwater positioning system), the three-dimensional coordinates of each beam footprint in the geographic coordinate system are calculated. .

[0045] By continuously moving along a pre-set survey line using an underwater transport platform, the multibeam echo sounder 201 continuously transmits and receives sound waves, thereby acquiring a large number of dense geographic coordinate points. The collection of these points, i.e., point cloud data, constitutes three-dimensional topographic data of the seabed. This three-dimensional topographic data, in the form of a digital model, accurately reproduces the topographic undulations and geomorphic features of the seabed within the survey area.

[0046] The function of the acoustic disturbance emission module 202 is to act as a non-contact excitation source to emit an energy-controlled acoustic disturbance pulse toward a target point on the seabed, so as to excite a measurable mechanical wave response in the seabed sediment.

[0047] In one specific embodiment, the acoustic disturbance emission module 202 is implemented using parametric array technology. The module includes a high-frequency signal generator, a programmable power amplifier, and a high-frequency transmitting transducer array. During operation, the high-frequency signal generator generates two signals with similar frequencies (e.g., ...). and However, the initial high-frequency acoustic signal has higher energy.

[0048] These two initial high-frequency acoustic signals are amplified by a programmable power amplifier and then synchronously emitted into the water by a high-frequency transmitting transducer array. Due to the nonlinear acoustic properties of water, these two high-frequency sound waves interact along their propagation path, generating a new frequency with the difference frequency between the two waves (where the frequency is the difference frequency between the two waves). The secondary sound wave. This difference frequency sound wave is the low-frequency acoustic disturbance pulse required by this invention.

[0049] The low-frequency acoustic disturbance pulse generated using parametric array technology has a narrow beamwidth similar to that of the parent high-frequency beam, thus possessing extremely high directivity. This high directivity allows acoustic energy to be precisely concentrated onto a predetermined target point on the seabed, thereby exciting a shear wave at that point.

[0050] The energy control function of the acoustic disturbance transmission module 202 is achieved by sending a control signal to the programmable power amplifier through the data fusion and decoding module 205. This control signal is used to adjust the gain of the power amplifier, thereby directly changing the transmission power of the initial high-frequency acoustic signal. Since the sound pressure of the difference frequency sound wave is proportional to the product of the sound pressure of the initial high-frequency sound wave, the energy of the acoustic disturbance pulse that ultimately acts on the seabed can be precisely controlled by adjusting the power of the initial sound wave.

[0051] The function of the tracking imaging sonar module 203 is to continuously image the seabed target point and its surrounding area after being excited by the acoustic disturbance emission module 202 with high temporal resolution, so as to capture and record the dynamic response process of the seabed caused by the acoustic disturbance pulse.

[0052] In one specific embodiment, the tracking imaging sonar module 203 is a high-frequency imaging sonar with its operating frequency set in the megahertz (MHz) range to obtain high spatial resolution for minute features on the seabed. The tracking imaging sonar module 203 includes a multi-unit transducer array. By precisely controlling the phase of the transmitted and received signals of each unit in the array, the tracking imaging sonar module 203 can achieve electrically controlled scanning of the sound beam without any mechanical rotation. This electrically controlled scanning method enables it to achieve an extremely high imaging frame rate.

[0053] The tracking imaging sonar module 203 operates as follows: First, it receives a trigger signal synchronized with the launch command from the acoustic disturbance transmission module 202 from the data fusion and interpretation module. Upon receiving the trigger signal, the tracking imaging sonar module 203 immediately begins continuous and rapid repetitive scanning imaging of the preset seabed field of view.

[0054] Each complete scan generates a single frame of two-dimensional acoustic image, recording the acoustic backscattering intensity at each point within the seabed field of view at that instant. Due to the high imaging frame rate (e.g., hundreds of frames per second), the tracking imaging sonar module 203 can output a temporally continuous image sequence. This image sequence is a dynamic response image sequence, which records, in the form of a video stream, the minute displacements or disturbances of sediment particles caused by shear waves propagating across the seabed surface. Each frame in this sequence corresponds to a precise point in time after the disturbance occurs.

[0055] The data fusion and interpretation module is the core of the detection system's computation and control. Its function is to receive and process raw data from other modules, deduce the seabed's geomechanical parameters through a series of calculations, and ultimately generate a distribution map registered with the 3D topographic data. This data fusion and interpretation module's functionality is achieved collaboratively by multiple internally integrated processing units.

[0056] In one specific embodiment, the data processing and parameter inversion process of the data fusion and interpretation module is as follows: First, before the acoustic disturbance emission module 202 operates, the tracking imaging sonar module 203 pre-acquires a sequence of background noise images. After receiving the dynamic response image sequence acquired by the tracking imaging sonar module 203, the module first filters the pre-acquired background noise image sequence to suppress the interference of environmental noise and inherent system noise on the effective signal. This process can be represented as: ; in: This is the original dynamic response image sequence; This is a sequence of images with background noise. This is a preset filtering algorithm; This is a clean image sequence obtained after noise suppression; , Image pixel coordinates, For time.

[0057] Next, the module analyzes the clean image sequence. Above, along the direction of shear wave propagation, a spatial distance of [missing information] is selected. Two points are identified, and the signal showing the change of pixel values ​​at these two points over time is extracted and denoted as . and The module calculates the cross-correlation function of the two signals. To determine the time difference of signal arrival: ; in: To delay time, The symbol is for integrals.

[0058] make Delay time to reach the maximum value This is the propagation time of the shear wave between these two points. The module then calculates the shear wave propagation velocity at that location. : ; Finally, the module is based on the shear wave propagation speed and the density of the seabed surface medium as predetermined or otherwise measured. Calculate the shear modulus at the target point. : ; The shear modulus These are the key parameters characterizing the geomechanical properties of the point.

[0059] Dielectric density The value can be set by combining historical geological data of the exploration area, or obtained by in-situ sampling tests at a few representative points during the exploration process, or based on empirical relationships in the area, through shear wave velocity. Make an estimate.

[0060] In a preferred embodiment, values ​​obtained by sampling tests at representative measurement points are used to ensure the accuracy of the calculation. The data fusion and interpretation module also performs adaptive disturbance control. The disturbance strategy control unit within the module evaluates the acquired clean image sequence in real time. The signal quality, such as calculating its signal-to-noise ratio. Then, the unit determines the signal-to-noise ratio based on the current signal-to-noise ratio. Compared with the preset target signal-to-noise ratio range The comparison results show the emission energy of the acoustic disturbance emission module 202 at the next target point. Adjustments are made. When When the value is below the lower limit of the target range, increase ;when When the value is above the upper limit of the target range, decrease .

[0061] The ultimate function of this data fusion and interpretation module is map generation and data registration. The module calculates a series of geomechanical parameters (shear modulus) with geographic coordinates from the above process. The data points are precisely registered in space with the 3D terrain data acquired from the multibeam echo sounder module 201. Through interpolation and smoothing, a visual distribution map is finally generated that can intuitively reflect the spatial distribution characteristics of the geomechanical properties within the exploration area.

[0062] The prefabrication process of steel pipe pile 1 is carried out based on the distribution map data generated by the seabed probe 2 in the second part. This distribution map provides precise geomechanical parameters for each predetermined pile location. Specifically, for shear modulus The quantized value. During the design phase, this shear modulus... The value, as a key soil mechanics input parameter, was used to perform independent structural calculations on the steel pipe pile 1 at this pile location.

[0063] For shear modulus In areas with higher values, the seabed geology is hard, and the penetration depth required for the steel pipe pile 1 to reach the predetermined bearing capacity is smaller. Therefore, the length of the steel pipe pile 1 prefabricated for this location can be designed to be relatively short.

[0064] Conversely, for shear modulus In areas with lower values, the seabed geology is soft, and the steel pipe pile 1 needs a greater penetration depth to achieve the same bearing capacity. Therefore, the length of the steel pipe pile 1 prefabricated for this location is designed to be relatively long.

[0065] Similarly, parameters such as the pile wall thickness and pile end reinforcement structure are also designed individually based on the pile driving resistance and other conditions reflected in the distribution map. Ultimately, the multiple steel pipe piles 1 prefabricated in the factory environment have different dimensional parameters, exhibiting irregular features that precisely match the actual geological conditions of the seabed.

[0066] Please see the appendix Figure 1 -Appendix Figure 4 In a preferred embodiment of the present invention, the locking connection mechanism includes a butt plate 4 and a C-shaped plate 5. The butt plate 4 and the C-shaped plate 5 are respectively fixedly connected to both sides of the steel pipe pile body 1. A leaf spring 6 is provided inside the C-shaped plate 5. A pressure plate 7 is fixedly connected to the side of the leaf spring 6. The pressure plate 7 is slidably connected inside the C-shaped plate 5. The pressure plate 7 is in contact with the butt plate 4. A friction strengthening component 8 is provided on the side of the pressure plate 7 and the butt plate 4 that are in contact with each other.

[0067] Specifically, each steel pipe pile 1 is fixedly connected to a locking connection mechanism on its side wall. On one steel pipe pile 1, the butt plate 4 is welded to one side and the C-shaped plate 5 is welded to the other opposite side. When two adjacent steel pipe piles 1 are connected, the butt plate 4 of one steel pipe pile 1 is inserted into the C-shaped plate 5 of the other steel pipe pile 1. During the installation process, when the butt plate 4 is driven into the C-shaped plate 5 by an external force (such as the excitation force of a vibratory hammer), it will push the pressure plate 7, causing the leaf spring 6 to undergo elastic deformation and store potential energy. When the external force is removed, the leaf spring 6 rebounds and applies a continuous preload force perpendicular to the contact surface to the butt plate 4 through the pressure plate 7.

[0068] Please see the appendix Figure 1 -Appendix Figure 4 In a preferred embodiment of the present invention, the friction strengthening component 8 includes an adhesion layer 801, a functional layer 802 and a sealing layer 803. The adhesion layer 801 is a nickel-aluminum alloy coating and is disposed on one side of the pressure plate 7 and the mating plate 4. The functional layer 802 is a tungsten carbide cobalt metal ceramic coating and is disposed on the outside of the adhesion layer 801. The sealing layer 803 is a penetrating epoxy sealant coating and is disposed on the outside of the functional layer 802.

[0069] Specifically, in order to increase the friction generated by the preload, friction strengthening components 8 are provided on the side where the pressure plate 7 and the butt plate 4 are in contact with each other. The innermost layer is the adhesion layer 801, which is a nickel-aluminum alloy coating applied directly to the steel substrate of the pressure plate 7 and the butt plate 4 by thermal spraying to provide bonding force with the substrate. The middle layer is the functional layer 802, which is a tungsten carbide cobalt metal ceramic coating applied to the outside of the adhesion layer 801. Its material properties provide a high static friction coefficient and wear resistance. The outermost layer is the sealing layer 803, which is a penetrating epoxy sealant coating applied to the outside of the functional layer 802 to fill the micropores on the surface of the functional layer to prevent seawater erosion.

[0070] Please see the appendix Figure 1 -Appendix Figure 4 In a preferred embodiment of the present invention, a positioning post 9 is fixedly connected to the side of the docking plate 4, and a positioning groove 10 is provided inside the C-shaped plate 5, with the positioning post 9 slidably connected inside the positioning groove 10.

[0071] Specifically, during the process of inserting the connecting plate 4 into the C-shaped plate 5, the positioning column 9 and the positioning groove 10 cooperate with each other to restrict the relative rotation between the two steel pipe piles 1.

[0072] Please see the appendix Figure 1 -Appendix Figure 4 In a preferred embodiment of the present invention, a guide plate 11 is fixedly connected inside the C-shaped plate 5, and a guide groove 12 is provided on the side of the mating plate 4.

[0073] Specifically, the side of the docking plate 4 is provided with a matching guide groove 12, which provides guidance during the initial insertion stage to ensure that the docking plate 4 can smoothly enter the predetermined position of the C-shaped plate 5.

[0074] Working Principle: During the in-situ seabed exploration phase, the seabed probe 2, equipped with a detection system, navigates along a pre-set survey line in the target area. During navigation, the multibeam echo sounder module 201 continuously acquires high-resolution three-dimensional seabed topographic data. Simultaneously, at pre-set discrete detection points, the detection system automatically executes a collaborative sequence: the acoustic disturbance emission module 202 emits a focused, energy-controlled low-frequency acoustic disturbance pulse towards the seabed target point; the tracking imaging sonar module 203 synchronously captures a sequence of dynamic response images of the target point and its surroundings at a high frame rate; and the data fusion and interpretation module processes the acquired data in real time, calculating and retrieving the shear modulus G of the point, and adaptively adjusting the emission energy of the next detection point based on signal quality feedback. This process is repeated throughout the entire exploration area, ultimately generating a seabed geomechanical property distribution map precisely registered with the three-dimensional topographic data.

[0075] During the design and prefabrication phases, the distribution map is used as the core input for structural design. For each steel pipe pile 1 at its predetermined installation location, the designers extract the shear modulus value and topographic elevation data of that point from the distribution map. Based on these precise in-situ data, structural engineering calculations are used to determine the specific dimensions required for the steel pipe pile 1 to meet the bearing capacity requirements, including pile length and wall thickness. Subsequently, in the factory environment, each pile is precisely prefabricated according to its individual design drawings, and the locking connection mechanism, including the butt plate 4, C-shaped plate 5, leaf spring 6, pressure plate 7, and friction strengthening component 8, is welded to the predetermined position on the side wall of the pile.

[0076] During the on-site installation and locking phase, multiple prefabricated irregularly shaped steel pipe piles 1 are transported to the construction site. Using pile driving equipment such as vibratory hammers, the steel pipe piles 1 are driven into the seabed one by one. When a new steel pipe pile 1 is driven, the mating plate 4 on its side wall is inserted into the C-shaped plate 5 of the adjacent steel pipe pile 1 under the guidance of the guide structure. The excitation force generated by the vibratory hammer drives the mating plate 4 to squeeze the pressure plate 7, so that the leaf spring 6 is compressed and stores elastic potential energy. When the steel pipe pile 1 is driven to the predetermined depth, the vibratory hammer stops working, the excitation force disappears, and the compressed leaf spring 6 rebounds. A strong pre-tightening force is applied to the mating plate 4 through the pressure plate 7. This pre-tightening force acts on the contact surface of the friction-enhancing component 8 with a high coefficient of friction, generating a friction force sufficient to resist environmental loads, thereby achieving instantaneous and temporary self-locking between adjacent piles, and finally forming a continuous and complete combined structure.

Claims

1. A composite structure of irregularly shaped steel pipe piles for complex seabed topography, comprising multiple steel pipe piles (1) and a seabed detector (2), characterized in that, Each of the multiple steel pipe piles (1) is provided with a locking connection mechanism on its side. The locking connection mechanism is used to connect and lock the multiple steel pipe piles (1) to each other in pairs. A waler frame (3) is provided on the inner side of each of the multiple steel pipe piles (1). The seabed detector (2) has a built-in detection system, which includes: Multibeam bathymetry module (201) is used to acquire three-dimensional topographic data of the seabed; Acoustic disturbance transmitting module (202) is used to transmit acoustic disturbance pulses to target points on the seabed; The tracking imaging sonar module (203) is used to acquire a sequence of dynamic response images of the seabed triggered by the acoustic disturbance pulses; The data fusion and interpretation module is electrically connected to the multibeam echo sounding module (201), the acoustic disturbance emission module (202), and the tracking imaging sonar module (203). The data fusion and interpretation module is used to process the dynamic response image sequence collected from multiple target points and combine it with the three-dimensional terrain data to generate a distribution map characterizing the seabed geomechanical properties. The steel pipe pile (1) is prefabricated based on the data of the distribution map.

2. The irregularly shaped steel pipe pile composite structure for complex seabed terrain according to claim 1, characterized in that, The data fusion and interpretation module is configured as follows: Based on the dynamic response image sequence acquired at each target point, the shear wave propagation velocity of the target point is calculated, and the shear modulus of the target point is calculated as a geomechanical parameter based on the shear wave propagation velocity. The shear modulus calculated from multiple target points is then registered with the three-dimensional terrain data to generate the distribution map.

3. The irregularly shaped steel pipe pile composite structure for complex seabed topography according to claim 2, characterized in that, The data fusion and interpretation module includes a perturbation strategy control unit, which is used to adaptively adjust the energy of the acoustic perturbation pulse emitted by the acoustic perturbation emission module (202) to the next target point based on the signal quality of the dynamic response image sequence acquired at a certain target point.

4. The irregularly shaped steel pipe pile composite structure for complex seabed terrain according to claim 3, characterized in that, The adaptive adjustment specifically refers to: When the signal quality is lower than a preset threshold, the acoustic disturbance transmission module (202) is instructed to increase the energy; When the signal quality is higher than a preset threshold, the acoustic disturbance transmission module (202) is instructed to reduce the energy.

5. The irregularly shaped steel pipe pile composite structure for complex seabed terrain according to claim 2, characterized in that, The data fusion and interpretation module includes a noise sampling unit, which is used to instruct the tracking imaging sonar module (203) to collect the background noise image sequence of the target point before the acoustic disturbance emission module (202) emits the acoustic disturbance pulse to any target point.

6. The irregularly shaped steel pipe pile composite structure for complex seabed terrain according to claim 5, characterized in that, The data fusion and interpretation module is configured as follows: The background noise image sequence is used to filter the dynamic response image sequence to remove background noise.

7. The irregularly shaped steel pipe pile composite structure for complex seabed terrain according to claim 1, characterized in that, The locking connection mechanism includes a docking plate (4) and a C-shaped plate (5). The docking plate (4) and the C-shaped plate (5) are respectively fixedly connected to both sides of the steel pipe pile body (1). A leaf spring (6) is provided inside the C-shaped plate (5). A pressure plate (7) is fixedly connected to the side of the leaf spring (6). The pressure plate (7) is slidably connected inside the C-shaped plate (5). The pressure plate (7) is in contact with the docking plate (4). A friction strengthening component (8) is provided on the side of the pressure plate (7) and the docking plate (4) that are in contact with each other.

8. The irregularly shaped steel pipe pile composite structure for complex seabed topography according to claim 7, characterized in that, The friction strengthening component (8) includes an adhesion layer (801), a functional layer (802), and a sealing layer (803). The adhesion layer (801) is a nickel-aluminum alloy coating and is disposed on one side of the pressure plate (7) and the mating plate (4). The functional layer (802) is a tungsten carbide cobalt metal ceramic coating and is disposed on the outside of the adhesion layer (801). The sealing layer (803) is a penetrating epoxy sealant coating and is disposed on the outside of the functional layer (802).

9. A composite structure of irregularly shaped steel pipe piles for complex seabed topography according to claim 7, characterized in that, The side of the docking plate (4) is fixedly connected to a positioning post (9), and the C-shaped plate (5) has a positioning groove (10) inside, and the positioning post (9) is slidably connected inside the positioning groove (10).

10. A composite structure of irregularly shaped steel pipe piles for complex seabed terrain according to claim 7, characterized in that, The C-shaped plate (5) is fixedly connected to a guide plate (11), and the side of the docking plate (4) is provided with a guide groove (12).

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