Pile leg assembly for sideslip test, pile tip bending moment calculation method and pile leg sideslip simulation test device

Abstract

The invention provides a pile leg assembly for a sideslip test, a pile tip bending moment calculation method and a pile leg sideslip simulation test device. The pile leg assembly comprises a pile leg main body, various pile shoes and a rotary connector. The pile shoe is detachably connected to the bottom of the pile leg body. The rotary connector comprises a first connecting piece, a second connecting piece and a locking connecting piece, the second connecting piece is connected with the pile leg body, the locking connecting piece is arranged between the first connecting piece and the second connecting piece, and the first connecting piece is connected with the actuator. Before a test, the locking connecting piece is located at the unlocking position, the first connecting piece and the second connecting piece are separated, and the direction in which the pile leg body adheres to the bending moment strain gauge is rotated to the direction in which the pile leg actually bends to the maximum extent. And then the locking connecting piece is switched to the locking position. According to the pile leg assembly for the sideslip test, after the pile leg assembly is connected to the actuator, the pile leg body can be rotated to the position where the direction where the bending moment strain gauge is pasted is consistent with the actual maximum bending direction of the pile leg.

Description

Pile leg assembly for sideslip testing, pile tip bending moment calculation method, and pile leg sideslip simulation test device. Technical Field

[0001] This invention relates to the field of marine engineering technology, and in particular to a pile leg assembly for sideslip testing, a method for calculating pile tip bending moment, and a pile leg sideslip simulation test device. Background Technology

[0002] When a jack-up drilling platform is positioned in an existing pile pit, a significant risk of leg slippage exists if the longitudinal projection of the pile shoe overlaps with the existing pile pit by 10% to 90%. This risk is primarily caused by the uneven support of the seabed soil. Specifically, the seabed within the existing pile pit has softened due to previous pile driving operations, resulting in reduced bearing capacity, while the original seabed outside the pile pit has higher hardness and therefore higher bearing capacity. When the pile shoe simultaneously covers seabed areas with significant differences in hardness, the vertical support force on the bottom of the pile shoe varies. Therefore, under the ballast of the platform, the pile leg will undergo bending deformation towards the existing pile pit. The greater the bending deformation, the lower the lateral constraint between the pile shoe and the seabed, further increasing the possibility of lateral slippage of the pile leg towards the existing pile pit area.

[0003] Currently, research on this type of sideslip risk largely relies on experimental simulations. The degree of bending of the pile leg is a key measurement parameter, typically achieved by attaching moment strain gauges, measuring surface strain, and converting it into bending moment. However, existing actuators used to simulate platform loads are fixedly connected to ordinary pile leg models, meaning the angle between the pile leg model and the actuator's axis is determined during installation. Since the bending direction of the pile leg during actual sideslip is predetermined by the location of the pile pit and the distribution of soft and hard seabed, and this direction is difficult to accurately predict before the test, the direction in which the moment strain gauges are pre-attached to the pile leg model is highly likely to be inconsistent with the actual direction of maximum bending of the pile leg. This directional deviation severely affects the accuracy of strain measurements, making it impossible to accurately calculate the bending moment, ultimately leading to significant errors in the assessment of the pile leg bending morphology and sideslip risk. In other words, the traditional fixed connection method prevents the experimental setup from flexibly and accurately aligning with the measurement direction according to simulated working conditions, resulting in low reliability of the measurement results. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a pile leg assembly for sideslip testing, a method for calculating pile tip bending moment, and a pile leg sideslip simulation test device, aiming to solve the problem in related technologies where the pile leg and actuator are rigidly connected, resulting in the direction of the bending moment strain gauges pre-attached to the pile leg after the connection with the actuator being inconsistent with the direction of the actual maximum bending of the pile leg.

[0005] This invention provides a pile leg assembly for a sideslip test, comprising:

[0006] The pile leg body includes a pile shoe disposed at the bottom of the pile leg body and a rotating connector comprising a first connector, a second connector, and a locking connector. The top end of the first connector is detachably connected to an actuator, and the bottom end of the second connector is connected to the top of the pile leg body. The locking connector is disposed between the first connector and the second connector and is used to restrict the radial movement of the first connector and the second connector. When the locking connector is in the unlocked position, the bottom surface of the first connector and the top surface of the second connector are separated, and the first connector and the second connector can rotate relative to each other. The axis of rotation is collinear with the axis of the pile leg body. When the locking connector is in the locked position, the bottom surface of the first connector and the top surface of the second connector are pressed together to restrict the relative rotation of the first connector and the second connector.

[0007] According to the pile leg assembly for sideslip testing provided by the present invention, the pile boots include multiple types, and the types of pile boots include at least two or more of the following: circular pile boots, polygonal pile boots, conical pile boots, and sleeve-type pile boots, and one of the multiple types of pile boots is detachably connected to the pile leg body.

[0008] According to the pile leg assembly for sideslip testing provided by the present invention, a first screw is provided on the top of the first connector, the first screw is used to connect with the threaded hole of the actuator, one of the first connector and the second connector has n adjustment holes on the end face edge, and the other has n positioning holes on the end face edge, the n adjustment holes and the n positioning holes are arranged in a one-to-one correspondence, and n≥3, the adjustment holes are arc-shaped holes, the arc-shaped holes extend around the axis of the first connector or the second connector, the locking connector includes n locking bolts, the n locking bolts and the n adjustment holes are arranged in a one-to-one correspondence, the threaded end of the locking bolt passes through the corresponding adjustment hole and is threadedly connected to the corresponding positioning hole.

[0009] According to the pile leg assembly for sideslip testing provided by the present invention, both the first connector and the second connector are flanges.

[0010] According to the pile leg assembly for sideslip testing provided by the present invention, a reinforcing rod is further provided between the second connector and the top end of the pile leg body, and the outer diameter of the reinforcing rod is larger than the outer diameter of the pile leg body.

[0011] According to the pile leg assembly for sideslip testing provided by the present invention, a second screw is provided at the top of the first connector, the second screw is used to connect with the threaded hole of the actuator, an external thread is provided on the outer circumferential surface of the first connector, the outer diameter of the second connector is less than or equal to the outer diameter of the first connector and greater than the outer diameter of the pile leg body, the locking connector is a sliding sleeve, the sliding sleeve is a cylindrical structure with an open top and a blocking ring at the bottom, the inner side of the sliding sleeve is provided with an internal thread that mates with the external thread of the first connector, the inner diameter of the blocking ring is greater than or equal to the outer diameter of the pile leg body and less than the outer diameter of the second connector.

[0012] According to the pile leg assembly for lateral slip testing provided by the present invention, the outer side of the sliding sleeve is further provided with an external hexagonal operating part.

[0013] According to the pile leg assembly for sideslip testing provided by the present invention, the second connector is detachably connected to the pile leg body.

[0014] This invention also provides a method for calculating the bending moment at the pile tip. As described above, three bending moment strain gauges are disposed on the main body of the pile leg assembly used for sideslip testing, near the pile tip. These three strain gauges are distributed axially along the main body of the pile leg. The formula for calculating the horizontal force at the pile tip is as follows: H = (M M -M B ) / L3=(M T -M M ) / L4=(M T -M B The formula for calculating the pile tip bending moment is as follows: M = M / (L3 + L4); B -H(L1+L2)=M M -H(L1+L2+L3)=M T -H(L1+L2+L3+L4); where M B M M and M T The values ​​of the bending moment detected by the three bending moment strain gauges from bottom to top are L1, L2, L3 and L4 respectively, representing the distance between the pile tip and the bottom end of the pile leg body, the distance between the bottom end of the pile leg body and the bending moment strain gauge located at the bottommost end, and the distance between two adjacent bending moment strain gauges from bottom to top.

[0015] The present invention also provides a pile leg sideslip simulation test device, including an actuator, a seabed simulation test tank and a pile leg assembly for sideslip test as described above. The top end of the pile leg body of the pile leg assembly is connected to the actuator through a rotating connector, and the bottom of the pile shoe of the pile leg assembly is used to abut against the seabed in the seabed simulation test tank.

[0016] The present invention, by adopting the above technical solution, has the following advantages: The pile leg assembly for sideslip testing provided by the present invention includes a pile leg body, a pile shoe, and a rotary connector. The pile shoe is located at the bottom of the pile leg body. The rotary connector includes a first connector, a second connector, and a locking connector. The bottom end of the second connector is connected to the top of the pile leg body. The locking connector is located between the first connector and the second connector to restrict the radial movement of the first connector and the second connector. The top end of the first connector is detachably connected to the actuator. Thus, the pile leg assembly is installed on the actuator via the second connector, the locking connector, and the first connector. Before the test, the locking connector is first placed in the unlocked position. At this time, the first connector and the second connector can move away from each other axially, so that there is no contact between them, and then they can rotate relative to each other. Finally, the direction in which the bending moment strain gauge is attached to the pile leg body is rotated to the direction in which the pile leg actually bends the most. Then, the locking connector is switched to the locked position. At this time, the bottom surface of the first connector and the top surface of the second connector are pressed together, and the static friction between them restricts their relative rotation. The pile leg assembly for sideslip testing provided by this invention allows the pile leg body to be rotated to a position where the direction in which the moment strain gauge is attached is consistent with the direction in which the pile leg actually experiences maximum bending after the pile leg assembly is connected to the actuator. This avoids directional deviations that could affect the accuracy of strain measurement, thereby enabling accurate calculation of the bending moment and ultimately achieving an accurate assessment of the pile leg's bending morphology and sideslip risk. It also enables the pile leg to flexibly and accurately align with the measurement direction based on simulated working conditions, thus improving the reliability of the measurement results.

[0017] Furthermore, the pile tip bending moment calculation method provided by the present invention is implemented using the pile leg assembly for the sideslip test as described above, and therefore has the same advantages as described above.

[0018] Furthermore, the pile leg sideslip simulation test device provided by the present invention includes an actuator, a seabed simulation test tank, and the same pile leg assembly for sideslip testing as described above, and therefore has the same advantages as described above. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 is a schematic diagram of the connection between the pile leg assembly and the actuator for a sideslip test according to an embodiment of the present invention; Figure 2 is an exploded structural diagram of the pile leg assembly and the actuator for a sideslip test according to an embodiment of the present invention; Figure 3 is a top view of the first connecting member according to an embodiment of the present invention; Figure 4 is a top view of the second connecting member according to an embodiment of the present invention; Figure 5 is a cross-sectional view of the connection structure of the first connecting member, the second connecting member, and the locking bolt according to an embodiment of the present invention; Figure 6 is a schematic diagram of the connection between the pile leg assembly and the actuator for a sideslip test according to another embodiment of the present invention; Figure 7 is an exploded structural diagram of the pile leg assembly and the actuator for a sideslip test according to another embodiment of the present invention; Figure 8 is a front view of the sliding sleeve according to another embodiment of the present invention; Figure 9 is a bottom view of the sliding sleeve according to another embodiment of the present invention; Figure 10 is a force diagram of the pile leg body according to an embodiment of the present invention.

[0021] Reference numerals: 100: Pile leg body; 200: Pile shoe; 310: First connecting piece; 311: First screw; 312: Second screw; 313: Positioning hole; 320: Second connecting piece; 321: Adjustment hole; 330: Locking bolt; 340: Sliding sleeve; 341: Operating part; 400: Reinforcing rod; 500: Actuator; 600: Bending moment strain gauge. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0028] The present invention provides a pile leg assembly for a sideslip test, comprising a pile leg body, a pile shoe, and a rotary connector. The pile shoe is located at the bottom of the pile leg body. The rotary connector includes a first connector, a second connector, and a locking connector. The bottom end of the second connector is connected to the top of the pile leg body. The locking connector is located between the first and second connectors to restrict their radial movement. The top end of the first connector is detachably connected to an actuator. Thus, the pile leg assembly is installed onto the actuator via the second connector, the locking connector, and the first connector. Before the test, the locking connector is first placed in the unlocked position. At this time, the first and second connectors can move away from each other axially, preventing contact and allowing relative rotation. Ultimately, the direction in which the bending moment strain gauge is attached to the pile leg body is rotated to the direction in which the pile leg actually experiences maximum bending. Then, the locking connector is switched to the locked position. At this time, the bottom surface of the first connector and the top surface of the second connector are pressed together, using static friction between them to restrict their relative rotation. The pile leg assembly for sideslip testing provided by this invention allows the pile leg body to be rotated to a position where the direction in which the moment strain gauge is attached is consistent with the direction in which the pile leg actually experiences maximum bending after the pile leg assembly is connected to the actuator. This avoids directional deviations that could affect the accuracy of strain measurement, thereby enabling accurate calculation of the bending moment and ultimately achieving an accurate assessment of the pile leg's bending morphology and sideslip risk. It also enables the pile leg to flexibly and accurately align with the measurement direction based on simulated working conditions, thus improving the reliability of the measurement results.

[0029] The following description, in conjunction with Figures 1 to 10, describes the pile leg assembly for sideslip testing, the pile tip bending moment calculation method, and the pile leg sideslip simulation test device of the present invention.

[0030] An embodiment of the present invention provides a pile leg assembly for a sideslip test, including a pile leg body 100, a pile shoe 200, and a swivel connector.

[0031] The pile shoe 200 is used to connect to the bottom of the pile leg body 100.

[0032] The rotary connector includes a first connector 310, a second connector 320, and a locking connector.

[0033] The top end of the first connector 310 is used for detachable connection with the actuator 500, and the bottom end of the second connector 320 is used for connection with the top end of the pile leg body 100. The bottom surface of the first connector 310 and the top surface of the second connector 320 are both planes.

[0034] A locking connector is disposed between the first connector 310 and the second connector 320. The locking connector, the first connector 310 and the second connector 320 can be connected to form an assembly, which forms the aforementioned rotary connector.

[0035] The locking connector can move between the locked position and the unlocked position. Regardless of whether the locking connector is in the locked position or the unlocked position, it can restrict the radial relative movement of the first connector 310 and the second connector 320.

[0036] When the locking connector is in the unlocked position, the first connector 310 and the second connector 320 can move relative to each other along the axial direction. That is, the second connector 320 can move away from the first connector 310, so that the bottom surface of the first connector 310 and the top surface of the second connector 320 are no longer in contact. At this time, the first connector 310 and the second connector 320 can rotate relative to each other, and the axis of rotation is collinear with the axis of the pile leg body 100.

[0037] When the locking connector is in the locked position, the bottom surface of the first connector 310 and the top surface of the second connector 320 are pressed together, and the static friction between them can limit their relative rotation.

[0038] The specific test procedure is as follows: Connect the pile shoe 200 to the bottom of the pile leg body 100 with the bending moment strain gauge attached, connect the first connector 310 to the actuator 500, connect the first connector 310 and the second connector 320 together using the locking connector, and put the locking connector in the unlocked position.

[0039] Then rotate the pile leg body 100 so that the direction where the bending moment strain gauge is attached is rotated to the direction of the greatest bending deformation of the pile leg. Then switch the locking connector to the locked position so that the bottom surface of the first connector 310 and the top surface of the second connector 320 are tightly fitted together to restrict the rotation of the pile leg body 100.

[0040] In some embodiments, multiple types of pile shoes 200 can be provided. One of the multiple pile shoes 200 can be detachably connected to the bottom of the pile leg body 100 according to the test requirements. Alternatively, different types of pile shoes 200 can be connected to the bottom of the pile leg body 100 according to the test requirements.

[0041] During the experiment, by changing different types of pile shoes 200, the relationship between the bending deformation of different types of pile shoes 200 and the main body of the pile leg 100 under the same ballast force can be obtained. The relationship between different ballast forces of the same type of pile shoe 200 and the bending deformation of the main body of the pile leg 100 can also be obtained.

[0042] In some embodiments, the actuator 500 is connected to the first connector 310 at a position where it is recessed into a threaded hole. Therefore, the top of the first connector 310 is provided with a first screw 311, which is threadedly connected to the threaded hole on the actuator 500. The bottom of the second connector 320 can be fixedly connected to the top of the pile leg body 100.

[0043] One of the first connector 310 and the second connector 320 has n adjustment holes 321 on its end face edge, and the other has n positioning holes 313 on its end face edge. The n adjustment holes 321 and the n positioning holes 313 are arranged one-to-one, and n≥3. The adjustment holes 321 are arc-shaped holes that extend around the axis of the first connector 310 or the second connector 320. The locking connector includes n locking bolts 330, which are arranged one-to-one with the n adjustment holes 321. The threaded end of the locking bolt 330 passes through the corresponding adjustment hole 321 and is threadedly connected to the corresponding positioning hole 313, or continues to pass through the corresponding adjustment hole 321 and is tightened with a nut.

[0044] For example, three positioning holes 313 can be provided on the edge of the end face of the first connector 310. The axes of the three positioning holes 313 are located on a cylindrical surface with the axis of the first connector 310 as the center line, and the two adjacent positioning holes 313 are spaced 120 degrees apart.

[0045] Correspondingly, three adjustment holes 321 are provided on the edge of the end face of the second connector 320, and the three adjustment holes 321 are provided one-to-one with the three positioning holes 313.

[0046] The locking connector may include three locking bolts 330, each corresponding to one of the three adjusting holes 321. The threaded end of the locking bolt 330 first passes through the corresponding adjusting hole 321 and then enters the positioning hole 313. The positioning hole 313 may have an internal thread, and the threaded end of the locking bolt 330 is threadedly connected to the positioning hole 313, and the second connector 320 is pressed against the first connector 310 by a nut.

[0047] Of course, the positioning hole 313 and the adjustment hole 321 can also be interchanged, that is, the positioning hole 313 is set on the second connector 320, and the adjustment hole 321 is set on the first connector 310.

[0048] In a specific embodiment, the first connector 310 and the second connector 320 can both be flanges. The outer diameter of the flange is larger than the outer diameter of the pile leg body 100, and the positioning hole 313 and the adjustment hole 321 are provided on the flange in the radial direction beyond the outer edge of the pile leg body 100.

[0049] In some embodiments, a second screw 312 is provided at the top of the first connector 310. The second screw 312 has the same structure as the first screw 311. The second screw 312 is threadedly connected to a threaded hole on the actuator 500. An external thread is provided on the outer peripheral surface of the first connector 310. The bottom of the second connector 320 is connected to the top of the pile leg body 100. The outer diameter of the second connector 320 is less than or equal to the outer diameter of the first connector 310, and greater than the outer diameter of the pile leg body 100.

[0050] The locking connector can be a sliding sleeve 340, which can include a cylinder with both ends through it and a blocking ring disposed at the bottom of the cylinder.

[0051] The inner diameter of the cylinder can be equal to the outer diameter of the first connector 310, and an internal thread is provided inside so that the first connector 310 can enter the cylinder and the two are connected by the thread.

[0052] The inner diameter of the retaining ring is greater than or equal to the outer diameter of the pile leg body 100, so that the retaining ring can move axially along the pile leg body 100. At the same time, the inner diameter of the retaining ring is smaller than the outer diameter of the second connecting member 320, so that the retaining ring can abut against the bottom end face of the second connecting member 320.

[0053] When the cylinder is threadedly connected to the first connector 310 and rotates in the first direction, the cylinder and the retaining ring move upward as a whole under the drive of the thread. The retaining ring drives the second connector 320 to move upward. Finally, the second connector 320 is pressed between the first connector 310 and the retaining ring, so that the bottom surface of the first connector 310 and the top surface of the second connector 320 are pressed together. The static friction between the first connector 310 and the second connector 320 restricts their relative rotation. At this time, the locking connector is in the locked position.

[0054] When the cylinder rotates in a second direction opposite to the first direction, the cylinder and the blocking ring move downward as a whole under the drive of the thread. Under the action of gravity, the second connecting piece 320 also moves downward. Finally, the top surface of the second connecting piece 320 disengages from the bottom surface of the first connecting piece 310, and the two can rotate relative to each other. At this time, the locking connecting piece is in the unlocked position.

[0055] Furthermore, an external hexagonal operating part 341 can be provided on the outside of the cylinder, which can be used to engage with a hexagonal wrench to facilitate rotating the cylinder.

[0056] Furthermore, to facilitate the installation of the sliding sleeve 340, the second connector 320 and the pile leg body 100 can be connected in a detachable manner, for example, they can be connected by threads.

[0057] When installing the sliding sleeve 340, the second connecting piece 320 can be disassembled first, the sliding sleeve 340 can be fitted into the pile leg body 100, and then the second connecting piece 320 can be reinstalled.

[0058] If the second connector 320 is fixedly connected to the pile leg body 100, then when installing the sliding sleeve 340, it can be inserted from the bottom of the pile leg body 100 before the pile shoe 200 is installed on the pile leg body 100.

[0059] In some embodiments, a reinforcing rod 400 may be provided between the second connector 320 and the top of the pile leg body 100, the outer diameter of the reinforcing rod 400 being larger than the outer diameter of the pile leg body 100. This can shorten the length of the pile leg body 100 and avoid the problem of the pile leg body 100 being too slender, resulting in increased deflection and affecting the test results.

[0060] In some embodiments, the pile shoe 200 and the pile leg body 100 may also be connected by threads.

[0061] In some embodiments, the type of pile boot 200 may include round pile boots, polygonal pile boots, conical pile boots, or sleeve-type pile boots, etc.

[0062] An embodiment of the present invention also provides a method for calculating the bending moment at the pile tip. As described above, the pile leg body 100 of the pile leg assembly for the side slip test is further provided with three bending moment strain gauges 600. The three bending moment strain gauges 600 are located near the pile tip and are distributed along the axial direction of the pile leg body.

[0063] From bottom to top, the three moment strain gauges can be identified as the first moment strain gauge, the second moment strain gauge, and the third moment strain gauge. The distance between the pile tip and the bottom of the pile leg body is L1, the distance between the bottom of the pile leg body and the first moment strain gauge is L2, the distance between the first moment strain gauge and the second moment strain gauge is L3, and the distance between the second moment strain gauge and the third moment strain gauge is L4.

[0064] The bending moment value detected by the first bending moment strain gauge is M. B The bending moment value detected by the second bending moment strain gauge is M. M The bending moment value detected by the third bending moment strain gauge is M. T .

[0065] The formula for calculating the horizontal force at the pile tip is as follows: H=(M M -M B ) / L3=(M T -M M ) / L4=(M T -M B The formula for calculating the pile tip bending moment is as follows: M = M / (L3 + L4); B -H(L1+L2)=M M -H(L1+L2+L3)=M T -H(L1+L2+L3+L4).

[0066] Embodiments of the present invention also provide a pile leg sideslip simulation test device, including an actuator 500, a seabed simulation test tank, and a pile leg assembly for sideslip testing as described above. The top end of the pile leg body 100 in the pile leg assembly is connected to the actuator 500 via a rotating connector, and the bottom of the pile shoe 200 of the pile leg assembly is used to abut against the simulated seabed in the seabed simulation test tank. Because it is equipped with the pile leg assembly for sideslip testing as described above, it has the same advantages as described above, which will not be repeated here.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pile leg assembly for a sideslip test, characterized in that, include: A pile leg body (100); a pile shoe (200) disposed at the bottom of the pile leg body (100); a rotating connector including a first connector (310), a second connector (320), and a locking connector, wherein the top end of the first connector (310) is detachably connected to an actuator (500), the bottom end of the second connector (320) is connected to the top of the pile leg body (100), and the locking connector is disposed between the first connector (310) and the second connector (320) and is used to restrict the connection between the first connector (310) and the second connector (500). The radial movement of the connector (320) is such that when the locking connector is in the unlocked position, the bottom surface of the first connector (310) and the top surface of the second connector (320) are separated, and the first connector (310) and the second connector (320) can rotate relative to each other. The axis of rotation is collinear with the axis of the pile leg body (100). When the locking connector is in the locked position, the bottom surface of the first connector (310) and the top surface of the second connector (320) are pressed together to restrict the relative rotation of the first connector (310) and the second connector (320).

2. The pile leg assembly for sideslip testing according to claim 1, characterized in that, The pile boot (200) includes multiple types, and the types of the pile boot (200) include at least two or more of the following: circular pile boot, polygonal pile boot, conical pile boot and sleeve-type pile boot. The pile boot (200) of the multiple types can be detachably connected to the pile leg body (100).

3. The pile leg assembly for sideslip testing according to claim 1, characterized in that, The top of the first connector (310) is provided with a first screw (311), which is used to connect with the threaded hole of the actuator (500). One of the first connector (310) and the second connector (320) has n adjusting holes (321) on its end face edge, and the other has n positioning holes (313) on its end face edge. The n adjusting holes (321) and the n positioning holes (313) are arranged in a one-to-one correspondence, and the n ≥3, the adjustment hole (321) is an arc-shaped hole, the arc-shaped hole extends around the axis of the first connector (310) or the second connector (320), the locking connector includes n locking bolts (330), the n locking bolts (330) are correspondingly set with the n adjustment holes (321), the threaded end of the locking bolt (330) passes through the corresponding adjustment hole (321) and is threadedly connected to the corresponding positioning hole (313).

4. The pile leg assembly for sideslip testing according to claim 3, characterized in that, Both the first connector (310) and the second connector (320) are flanges.

5. The pile leg assembly for sideslip testing according to claim 3, characterized in that, A reinforcing rod (400) is also provided between the second connector (320) and the top end of the pile leg body (100), and the outer diameter of the reinforcing rod (400) is larger than the outer diameter of the pile leg body (100).

6. The pile leg assembly for sideslip testing according to claim 1, characterized in that, The first connector (310) is provided with a second screw (312) at its top. The second screw (312) is used to connect with the threaded hole of the actuator (500). The outer circumferential surface of the first connector (310) is provided with an external thread. The outer diameter of the second connector (320) is less than or equal to the outer diameter of the first connector (310) and greater than the outer diameter of the pile leg body (100). The locking connector is a sliding sleeve (340). The sliding sleeve (340) is a cylindrical structure with an open top and a blocking ring at the bottom. The inner side of the sliding sleeve (340) is provided with an internal thread that mates with the external thread of the first connector (310). The inner diameter of the blocking ring is greater than or equal to the outer diameter of the pile leg body (100) and less than the outer diameter of the second connector (320).

7. The pile leg assembly for sideslip testing according to claim 6, characterized in that, The outer side of the sliding sleeve (340) is also provided with an external hexagonal operating part (341).

8. The pile leg assembly for sideslip testing according to claim 6, characterized in that, The second connector (320) is detachably connected to the pile leg body (100).

9. A method for calculating the bending moment at the pile tip, characterized in that, The pile leg assembly for sideslip testing as described in any one of claims 1 to 8 has three moment strain gauges disposed on the pile leg body (100) near the pile tip, the three moment strain gauges being distributed axially along the pile leg body; wherein, the formula for calculating the horizontal force at the pile tip is as follows: H = (M M -M B ) / L3=(M T -M M ) / L4=(M T -M B The formula for calculating the pile tip bending moment is as follows: M = M / (L3 + L4); B -H(L1+L2)=M M -H(L1+L2+L3)=M T -H(L1+L2+L3+L4); where M B M M and M T The values ​​of the bending moment detected by the three bending moment strain gauges from bottom to top are L1, L2, L3 and L4 respectively, representing the distance between the pile tip and the bottom end of the pile leg body, the distance between the bottom end of the pile leg body and the bending moment strain gauge located at the bottommost end, and the distance between two adjacent bending moment strain gauges from bottom to top.

10. A pile leg lateral slip simulation test device, characterized in that, It includes an actuator (500), a seabed simulation test tank, and a leg assembly for sideslip testing as described in any one of claims 1 to 8, wherein the top end of the leg body (100) of the leg assembly is connected to the actuator (500) via a rotating connector, and the bottom of the leg shoe (200) of the leg assembly is used to abut against the seabed in the seabed simulation test tank.

Images