A full life cycle mechanical performance test system for a suction anchor foundation

Abstract

The application discloses a kind of suction anchor foundation full life cycle mechanical property test system, comprising: model box;Compression roller assembly, compression roller assembly includes compression roller group, traction shaft, compression roller group motor, compression roller group motor is connected with traction shaft transmission, so that traction shaft retraction compression roller group;In the soil consolidation stage for the soil consolidation air bag, compression roller group is used to provide support reaction for the air bag in inflation state;Outside the model box, the injection component is connected with the inside of suction anchor by pressure pipeline, to carry out injection, water / gas operation;Fixed portal frame;Moving platform, moving platform is located directly above the model box, the upper side of fixed portal frame, can move horizontally;Electric cylinder, electric cylinder is vertically connected to the lower side of moving platform, and is detachably connected with the upper end of suction anchor.The application can be used to simulate the mechanical properties of suction anchor foundation installation, service and recovery stages, and provides a reliable test platform for China's infrastructure to go to deep sea.

Description

Technical Field

[0001] This invention relates to the field of marine geotechnical engineering technology, specifically to a life-cycle mechanical performance testing system for suction anchor foundations. Background Technology

[0002] Suction anchors are a widely used foundation type in marine geotechnical engineering, and their entire life cycle mainly includes three stages: installation, service, and recovery. Compared with other foundation types, suction anchors have advantages such as low cost, simple construction, fast construction speed, and recyclability. However, the geotechnical mechanical properties of suction anchors at each stage of their life cycle are still unclear. Developing a life-cycle mechanical performance testing system for suction anchor foundations can provide a reliable experimental platform for studying the mechanical properties of suction anchors at each stage of installation, service, and recovery, which has significant practical implications for the development of marine geotechnical engineering.

[0003] Existing similar patents include: "An indoor test device and method for obtaining the construction pressure difference of suction anchors in cohesive soil" (2021): This test equipment includes a test chamber, reaction frame, electric cylinder, pressure gauge, etc., and can obtain the pressure difference required for the suction anchor to penetrate in clay through the test, ensuring the construction safety of the suction anchor. "A suction anchor test device and test method" (2020): This test device can put the suction anchor model into various linked states such as rotational motion, horizontal movement, and vertical movement, and can apply various composite loading conditions to the suction anchor. "A test device for realizing the visualization of soil under high-speed load of suction anchor" (2021): This test device realizes the rapid upward pull of the suction anchor in visualized soil, and can accurately observe the fracture surface of the soil and the movement direction of soil particles under high-speed upward load of the suction anchor.

[0004] Existing patents mainly focus on developing related testing equipment for the installation stage of suction anchors, while few devices can simultaneously conduct tests throughout the entire life cycle of installation, service, and recovery. Summary of the Invention

[0005] The purpose of this invention is to provide a life-cycle mechanical performance testing system for suction anchor foundations, which can simultaneously perform tests during the installation, service, and recycling stages of the entire life cycle.

[0006] The objective of this invention is achieved as follows: a life-cycle mechanical performance testing system for suction anchor foundations, comprising:

[0007] The model box contains soil and has an open structure at the top.

[0008] The pressure roller assembly includes a pressure roller group, a traction shaft, and a pressure roller group motor. The pressure roller group is formed by connecting several pressure roller shafts in parallel and forming an openable cover structure at the upper end of the model box (4). The pressure roller group motor is fixedly installed on the outer wall of the model box. The traction shaft is rotatably connected to one side of the upper end of the model box and is connected to the pressure roller group through a traction component. The pressure roller group motor is connected to the traction shaft for transmission so that the traction shaft can retract and extend the pressure roller group.

[0009] In the soil consolidation stage, airbags are used for soil consolidation. The airbags are laid on the upper surface of the soil inside the model box and are located under the pressure roller group, which is used to provide support reaction force for the inflated airbags.

[0010] The injection component, located outside the model box, is connected to the interior of the suction anchor via a pressure pipe to perform water / air injection operations.

[0011] The fixed gantry is fixedly installed and provides reaction force for the suction anchor tension and compression.

[0012] A mobile platform, which is horizontally movable and connected to the upper side of the fixed gantry and positioned directly above the model box;

[0013] An electric cylinder is vertically connected to the lower side of the moving platform and detachably connected to the upper end of the suction anchor.

[0014] Furthermore, the system also includes a servo motor and a lead screw moving mechanism, which are mounted on a fixed gantry. The lead screw of the lead screw moving mechanism passes through the moving platform, and the servo motor is connected to the lead screw of the lead screw moving mechanism to drive the moving platform to translate.

[0015] Furthermore, it also includes a synchronous wheel transmission mechanism installed on the lower side of the mobile platform. The synchronous wheel transmission mechanism includes a drive wheel that is driven to rotate by a driver, two guide wheels distributed vertically, and a traction steel wire rope with a force sensor installed. The traction steel wire rope is wound around the drive wheel and abuts against the rim of the guide wheel. The lower end of the traction steel wire rope enters the soil and is inclinedly connected to the lower position of the suction anchor. When the suction anchor is stretched at multiple angles, the drive wheel winds up the traction steel wire rope to pull the suction anchor.

[0016] Furthermore, the injection component is equipped with a vacuum valve, which controls the pressure value of the injection component to perform graded pressure loads.

[0017] The beneficial effects of this invention are as follows:

[0018] The system's testing equipment achieves the installation and recovery conditions of suction anchors through a staged extraction and water / air injection system, and achieves the tensile and compressive conditions of suction anchors during service through a variable angle tensile and compressive testing machine; the system can simultaneously achieve testing throughout the entire life cycle of the suction anchor, including installation, service, and recovery. Attached Figure Description

[0019] Figure 1 This is a system layout diagram of the present invention.

[0020] Figure 2 This is a schematic diagram of stretching the suction anchor at multiple angles using a synchronous wheel transmission mechanism.

[0021] In the diagram: 1-Bracket; 2-Injection component; 3-Ladder; 4-Model box; 5-Sprocket box; 6-Traction shaft; 7-Pressure pipe; 8-Column; 9-Beam; 10-Guide rail; 11-Screw moving mechanism; 12-Synchronous pulley transmission mechanism; 12a-Drive wheel; 12b-Traction steel wire rope; 12c-Guide wheel; 13-Visible watertight door; 14-Moving platform; 15-Electric cylinder; 16-Suction anchor; 17-Servo motor; 18-Pressure roller shaft; 19-Pressure roller group; 20-Pressure roller group motor; 21-Embedded part; 22-Control cabinet. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 As shown, a life-cycle mechanical performance testing system for suction anchor foundations includes the following structural components:

[0024] Control cabinet 22 is connected to the control computer host;

[0025] Model box 4 contains soil and has an open structure at the top. Its side wall is equipped with a visible watertight door 13 and a ladder 3 arranged from bottom to top. The ladder 3 extends all the way up to the top of the model box 4 so that the operator can climb up the ladder 3 to observe or perform other operations.

[0026] The pressure roller assembly includes a pressure roller group 19, a traction shaft 6, and a pressure roller group motor 20. The pressure roller group 19 is formed by several pressure roller shafts 18 connected in parallel and forms an openable cover structure at the upper end of the model box 4. The pressure roller group motor 20 is fixedly installed on the outer wall of the model box 4. The traction shaft 6 is rotatably connected to one side of the upper end of the model box 4 and is connected to the pressure roller group 19 through a traction component. The pressure roller group motor 20 is connected to the traction shaft 6 through a chain. The transmission chain is protected by a sprocket box 5. The pressure roller group motor 20 can drive the traction shaft 6 to rotate to pull the pressure roller group 19 upward or release it downward, thereby closing or opening the upper opening of the model box 4.

[0027] In the soil consolidation stage, the airbags used for soil consolidation are laid on the upper surface of the soil inside the model box 4 and under the pressure roller group 19. The pressure roller group 19 is used to provide support reaction force for the inflated airbags, so as to increase the adhesion pressure between the airbags and the soil, so as to facilitate soil consolidation.

[0028] The injection component 2, located outside the model box 4, is connected to the interior of the suction anchor 16 through the pressure pipe 7 to perform water / air injection operations. The injection component 2 is equipped with a vacuum valve, and graded pressure loads are performed by controlling the pressure value of the injection component 2. The injection component 2 is equipped with a bracket 1, which supports the injection component 2.

[0029] A fixed gantry is fixed in the ground foundation and provides a reaction force for the tension and compression of the suction anchor 16, so that the model box 4 is placed inside the fixed gantry;

[0030] The mobile platform 14 is located directly above the model box 4 and is connected to the upper side of the fixed gantry, and can move horizontally.

[0031] Electric cylinder 15 is vertically connected to the lower side of the moving platform 14 and detachably connected to the upper end of the suction anchor 16 (the specific connection method is not limited), so as to facilitate applying pressure to the suction anchor 16 or pulling it out and retrieving it later.

[0032] The fixed gantry includes:

[0033] Two sets of vertically extending columns 8 are located on the outer sides of the model box 4. The bottom of the columns 8 is equipped with embedded parts 21 to better fix them in the ground foundation.

[0034] A pair of horizontally extending and parallel crossbeams 9 are positioned directly above the model box 4, and a movable platform 14 is horizontally mounted on the pair of crossbeams 9.

[0035] It also includes a servo motor 17 and a lead screw moving mechanism 11. The lead screw moving mechanism 11 is a conventional mechanical component, which includes a lead screw and a nut. The nut is installed in the moving platform 14. The servo motor 17 and the lead screw moving mechanism 11 are installed on a fixed gantry. The lead screw of the lead screw moving mechanism 11 passes through the nut of the moving platform 14. The servo motor 17 is connected to the lead screw of the lead screw moving mechanism 11 to drive the moving platform 14 to translate.

[0036] To enhance the guidance of the movement trajectory, a pair of parallel guide rails 10 are also included, which are installed on the top of the fixed gantry. The moving platform 14 slides with the guide rails 10 and slides along the length of the guide rails 10.

[0037] like Figure 2As shown, it also includes a synchronous wheel transmission mechanism 12 installed on the lower side of the mobile platform 14. The synchronous wheel transmission mechanism 12 includes a drive wheel 12a driven to rotate by a driver, two guide wheels 12c distributed vertically, and a traction steel wire rope 12b with a force sensor installed. A displacement sensor is installed on the upper end of the suction anchor 16. The traction steel wire rope 12b is wound around the drive wheel 12a and abuts against the rim of the guide wheel 12c. The lower end of the traction steel wire rope 12b enters the soil and is inclinedly connected to the lower position of the suction anchor 16. When the suction anchor 16 is stretched at multiple angles (the electric cylinder 15 is separated from the suction anchor 16), the drive wheel 12a winds up the traction steel wire rope 12b to pull the suction anchor 16.

[0038] The suction anchor's entire life cycle includes three stages: installation, service, and recovery. This testing equipment uses a staged extraction and water / air injection system to simulate the installation and recovery conditions of the suction anchor, and a variable angle tension / compression testing machine to simulate the tension / compression conditions during the service stage. See the suction anchor foundation life cycle mechanical performance testing system for details. Figure 1 This testing system primarily performs three functions: soil consolidation, installation and retrieval of suction anchors, and testing of suction anchors under tension and compression conditions during service. Details are as follows:

[0039] 1. Consolidation of Marine Soil and Rock Mass: Using the pressure roller assembly 19 as a reaction frame, the air bladder between the soil mass and the pressure roller assembly 19 is inflated to reach the preset consolidation pressure. The air bladder valve is then closed, and the drain valve at the bottom of the model box 4 is opened, thereby achieving the consolidation of the marine soil and rock mass. The consolidation time can be determined based on theoretical calculations. After consolidation is completed, the drain valve at the bottom of the model box 4 is closed, the air bladder valve is opened, and the air bladder is retracted. During the consolidation process, key indicators such as pore pressure, earth pressure, and surface settlement can be measured using a pore pressure gauge, earth pressure cell, and displacement meter.

[0040] 2. Installation and Retrieval of the Suction Anchor: The vacuum pump, solenoid valve, water tank, and other components in the injection component 2 (i.e., the staged water / air system) create a staged negative pressure inside the suction anchor 16 to achieve the sinking of the suction anchor 16 under the staged negative pressure. The sinking amount under the staged negative pressure is measured by a displacement gauge until the suction anchor 16 sinks to the predetermined position. Similarly, water is injected into the suction anchor 16 through the vacuum pump, solenoid valve, water tank, and other components to pressurize the inside of the suction anchor 16 and achieve the retrieval of the suction anchor 16.

[0041] 3. Tension and Compression Conditions during Service of the Suction Anchor: The control host (a computer with dedicated control software) moves the electric cylinder 15 directly above the suction anchor 16 via the lead screw moving mechanism 11. The electric cylinder 15 applies graded vertical loads, while force and displacement sensors measure the loads and displacements acting on the suction anchor 16, thus achieving the compression condition during service. The control host adjusts the angle between the wire rope and the suction anchor 16 via the lead screw moving mechanism 11 and the synchronous wheel transmission mechanism 12. At the same time, force sensors on the wire rope and displacement sensors on the suction anchor 16 measure the loads and displacements acting on the suction anchor 16, thus achieving the multi-angle graded tension test condition of the suction anchor 16.

[0042] The above are preferred embodiments of the present invention. Those skilled in the art can make various modifications or improvements based on these embodiments. Without departing from the overall concept of the present invention, such modifications or improvements should fall within the scope of protection claimed by the present invention.

Claims

1. A life-cycle mechanical performance testing system for suction anchor foundations, characterized in that, include: Model box (4) contains soil and has an open structure at the top; The pressure roller assembly includes a pressure roller group (19), a traction shaft (6), and a pressure roller group motor (20). The pressure roller group (19) is formed by connecting several pressure roller shafts (18) in parallel and forming an openable cover structure at the upper end of the model box (4). The pressure roller group motor (20) is fixedly installed on the outer wall of the model box (4). The traction shaft (6) is rotatably connected to one side of the upper end of the model box (4) and pulls the pressure roller group (19) through a traction component. The pressure roller group motor (20) is connected to the traction shaft (6) for transmission so that the traction shaft (6) can retract and extend the pressure roller group (19). The airbags used for soil consolidation during the soil consolidation stage are laid on the upper surface of the soil in the model box (4) and under the pressure roller group (19), which is used to provide support reaction force for the inflated airbags. The injection component (2) located outside the model box (4) is connected to the interior of the suction anchor (16) through the pressure pipe (7) to perform water / air injection operations. The injection component (2) is equipped with a vacuum valve, and the pressure value of the injection component (2) is controlled to perform graded pressure load. The fixed gantry is fixedly installed and provides a reaction force for the tension and compression of the suction anchor (16); The mobile platform (14) is horizontally movable and connected to the upper side of the fixed gantry and is located directly above the model box (4); Electric cylinder (15), which is vertically connected to the lower side of the moving platform (14) and detachably connected to the upper end of the suction anchor (16); The synchronous wheel transmission mechanism (12) installed on the lower side of the mobile platform (14) includes a drive wheel (12a) driven to rotate by a driver, two guide wheels (12c) distributed vertically, and a traction steel wire rope (12b) with a force sensor installed. The traction steel wire rope (12b) is wound around the drive wheel (12a) and abuts against the rim of the guide wheel (12c). The lower end of the traction steel wire rope (12b) enters the soil and is inclinedly connected to the lower position of the suction anchor (16). When the suction anchor (16) is stretched at multiple angles, the drive wheel (12a) winds up the traction steel wire rope (12b) to pull the suction anchor (16).

2. The suction anchor foundation full life cycle mechanical performance testing system according to claim 1, characterized in that: The fixed gantry includes: Two sets of vertically extending columns (8) are located on the two outer sides of the model box (4); A pair of horizontally extending and parallel crossbeams (9) are positioned directly above the model box (4), and the moving platform (14) is horizontally movable above the pair of crossbeams (9).

3. The suction anchor foundation full life cycle mechanical performance testing system according to claim 1, characterized in that, It also includes a servo motor (17) and a lead screw moving mechanism (11), which are mounted on a fixed gantry. The lead screw of the lead screw moving mechanism (11) passes through the moving platform (14). The servo motor (17) is connected to the lead screw of the lead screw moving mechanism (11) to drive the moving platform (14) to translate.

4. The suction anchor foundation full life cycle mechanical performance testing system according to claim 3, characterized in that, It also includes a pair of parallel guide rails (10) mounted on the top of the fixed gantry, the moving platform (14) slidingly engaging with the guide rails (10) and sliding along the length of the guide rails (10).

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