CN209086092U - The removable marine jack-up unit shoe model loading test device of one kind - Google Patents

Abstract

The utility model discloses the removable marine jack-up unit shoe model loading test devices of one kind, device includes guide rail, soil bin, load shoe, sensor, data collecting instrument and computer, the utility model plugs testing equipment of the mini Mod than ruler of shoe for jack-up unit, can effectively simulate jack-up unit plug shoe injection, it is in place, disturbed, the working conditions such as extraction, and resistance of soil and the accurate measurement of deformation during loading.Have great importance to jack-up unit stability of foundation and security evaluation.The apparatus structure is simple simultaneously, and installation positioning is convenient, tests process PLC technology, easy to operate, high degree of automation.

Description

A movable offshore jack-up platform spud shoe model loading test device

technical field

The utility model belongs to the technical field of offshore engineering, and in particular relates to a movable offshore self-elevating platform pile shoe model loading test device.

Background technique

In recent years, with the development of my country's offshore oil and gas, the current offshore jack-up platform has the advantages of strong mobility, can effectively reduce the cost of offshore oil and gas development, and good operation stability. and pile boots. Generally, an independent spud shoe foundation in the form of three legs is used, which can support and resist overturning of the upper platform in the seabed soil. Compared with the traditional pile foundation platform, the mud penetration depth is smaller, and greater bearing capacity and better stability can be obtained under the same mud penetration depth.

When the movable wellhead platform is in normal oil and gas extraction operations, there is usually a jack-up drilling platform (vessel) nearby performing drilling or maintenance operations. Since the diameter of the current drilling platform pile boots is generally between 6 and 20m, it is a super-large diameter structure. Therefore, the penetration process of the pile shoe will produce a large effect of extruding soil in the downward and surrounding directions, and there is a secondary extruding and expelling process in the pulling out process. Therefore, the process of inserting and pulling out piles on the offshore jack-up drilling platform will inevitably have an adverse impact on the pile shoe foundation of the surrounding wellhead platforms. In severe cases, the surrounding platforms may be tilted or even overturned, resulting in serious engineering accidents.

Therefore, it is of great significance for the safety evaluation of the wellhead platform to simulate the affected conditions of the movable wellhead platform, analyze the bearing capacity and displacement changes, and evaluate the stability of the wellhead platform.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, and to provide a movable offshore jack-up platform pile shoe model loading test device.

The utility model is achieved through the following technical solutions:

A movable offshore self-elevating platform pile shoe model loading test device, guide rails, test soil grooves, loading pile shoes, sensors, data acquisition instruments and a computer, the guide rails are placed transversely on the test soil grooves, and the guide rails are arranged on the guide rails. There is a loading shoe that can move along the guide rail, the loading shoe includes a motor mounting plate and a lower backing plate for placing the motor and being clamped on the guide rail, and a transmission mechanism passing through the motor mounting plate and the lower backing plate, the transmission The mechanism includes a horizontal upper moving plate, a vertical force transmission guide rod and a horizontal lower moving plate. The lower end of the horizontal lower moving plate is provided with a flange plate, the lower end of the flange plate is provided with a pile shoe loading rod, and a stepper motor is arranged at the lower end of the motor mounting plate. The upper end of the stepping motor is provided with a lead screw, which passes through the motor mounting plate and is connected to the horizontal upper moving plate through the upper moving plate screw. The downward force makes the transmission mechanism push the pile shoe loading rod to move downward; the computer is connected with the sensor through the data acquisition instrument.

The test soil tank was in the shape of a cube.

The depth of the test soil tank is 1-3m.

The guide rail is provided with a movable weighing frame, and the position of the guide rail can be changed through the movement of the weighing frame.

The lower end of the spud shoe loading rod is connected to a spud shoe model, and the spud shoe model is a cylinder or a cube.

The sensors include displacement sensors and tension-compression sensors.

The displacement sensor is a wire-pull type displacement sensor, the main body of the sensor is installed on the horizontal upper moving plate, one end of the sensor wire is fixed on the motor mounting plate through the horizontal upper moving plate, and the sensor obtains the displacement change of the loading device by detecting the change of the length of the pulling wire.

The tension and compression sensor is an S-type strain sensor, which is installed on the pile shoe loading rod and can measure the vertical force on the pile shoe. The acquisition is performed, and the resulting force and displacement are output through the computer software.

The data acquisition instrument is provided with a motor driver, a motor drive transformer, a multi-axis motion controller and a motor driver, the loading pile shoe is connected to the motor driver through a motor control line, the motor driver is connected to the motor drive transformer, and the motor drive transformer and the motor driver are connected to the multi-axis motor. The axis motion controller is connected, and the motor driver and the controller transformer are respectively connected with the power switch.

A method for loading and testing a model of a movable offshore jack-up platform spud shoe, which is carried out according to the following steps:

Step 1. Fill the sand tank with sand rain method, and slowly inject water to make the sand saturated. After filling the soil to the specified height, level the soil surface, and install the pile shoe model on the loading rod of the loading system;

Step 2: Move the pile shoe model down slowly and vertically through the pile shoe loading device until it just touches the soil surface, and the data acquisition instrument and computer collect the displacement and bearing capacity data of the pile shoe; pull up the pile shoe until it completely leaves the soil surface, and save it. Experiment data, organize the test equipment, turn off the power supply, and the test is over.

In the second step, a program is input to control the loading system, so that the spud shoe shaft operates according to the steps of "primary loading penetration-static-secondary loading penetration-pull-up reset". The loading speed of the first loading penetration is 0.1mm/s, and the loading distance is 120mm; the resting time is 1200s, and the soil around the pile boots is artificially disturbed during the resting period; the penetration speed of the secondary loading is 0.1mm/s, and the loading distance is 50mm; The pull-up reset speed is 2mm/s, and the pull-up displacement is 200mm.

The advantages and beneficial effects of the present utility model are:

The utility model is a small model scale test equipment for the self-elevating platform plugging and unplugging pile shoes, which can effectively simulate the working states of the self-elevating platform plugging and unplugging pile shoes, such as penetration, in-position, disturbed, and pulling out, etc. Accurate measurement of soil resistance and deformation during loading. It is of great significance to the foundation stability and safety assessment of the jack-up platform. At the same time, the device has simple structure, convenient installation and positioning, programmable control of the test process, simple operation and high degree of automation.

Description of drawings

Figure 1 shows the overall schematic diagram of the device.

Figure 2 Schematic diagram of the movable base.

Figure 3 is a schematic diagram of the positioning system.

Fig. 4 is a schematic diagram of the loading device for plugging and unplugging pile shoes.

Figure 5 Schematic diagram of the affected spud shoe loading device.

Figure 6. Bearing capacity-displacement curve.

In the figure: 1. Stepping motor; 2. Motor screw; 3. Motor mounting plate; 4. Motor support rod; Guide rod sliding pair; 9. Positioning beam; 10. Horizontal upper moving plate; 11. Upper moving plate screw pair; 12. Vertical force transmission guide rod; 13. Horizontal lower moving plate; 14. Flange plate; 15, Pile shoe loading rod; 16, control box; 17, motor control line; 18, power cord; 19, box shell; 20, power switch; 21, multi-axis motion controller; 22, motor driver; 23, controller transformer 24. Motor driven transformer; 25. Internal wire; 26. Displacement sensor; 27. Tension and pressure sensor; 28. Dynamic data acquisition instrument; 29. Computer;

For those of ordinary skill in the art, other related drawings can be obtained from the above drawings without any creative effort.

Detailed ways

In order to make those skilled in the art better understand the solution of the present invention, the technical solution of the present invention is further described below with reference to specific embodiments.

Example 1

A movable offshore self-elevating platform pile shoe model loading test device, guide rail 31, test soil groove 32, loading pile shoe 33, sensor, data acquisition instrument and computer, the guide rail is placed horizontally on the test soil groove, in The guide rail is provided with a loading spud shoe that can move along the guide rail. The loading spud shoe includes a motor mounting plate 3 and a lower backing plate 5 for placing the motor and being clamped on the guide rail, and a transmission through the motor mounting plate and the lower backing plate. The transmission mechanism includes a horizontal upper moving plate 10, a vertical force transmission guide rod 12 and a horizontal lower moving plate 13. The lower end of the horizontal lower moving plate is provided with a flange 14, and the lower end of the flange is provided with a pile shoe loading rod 15. The lower end of the motor mounting plate is provided with a stepper motor 1, and the upper end of the stepper motor is provided with a lead screw 2. The lead screw passes through the motor mounting plate and is connected to the horizontal upper moving plate through the upper moving plate lead screw, and the stepping motor drives the motor lead screw. Rotation, the motor lead screw rotates to exert downward force on the horizontal upper moving plate, so that the transmission mechanism pushes the pile shoe loading rod to move downward; the computer is connected with the sensor through the data acquisition instrument.

The lower end of the spud shoe loading rod is connected to the spud shoe model, and the spud shoe model is a cylinder. The sensors include displacement sensors and tension-compression sensors. The displacement sensor is a wire-pull type displacement sensor, the main body of the sensor is installed on the horizontal upper moving plate, one end of the sensor wire is fixed on the motor mounting plate through the horizontal upper moving plate, and the sensor obtains the displacement change of the loading device by detecting the change of the length of the pulling wire. The tension and compression sensor is an S-type strain sensor, which is installed on the pile shoe loading rod and can measure the vertical force on the pile shoe. The acquisition is performed, and the resulting force and displacement are output through the computer software.

The data acquisition instrument is provided with a motor driver, a motor drive transformer, a multi-axis motion controller and a motor driver, the loading pile shoe is connected to the motor driver through a motor control line, the motor driver is connected to the motor drive transformer, and the motor drive transformer and the motor driver are connected to the multi-axis motor. The axis motion controller is connected, and the motor driver and the controller transformer are respectively connected with the power switch.

The utility model is further described in detail with reference to the accompanying drawings by taking the analysis of the change experiment of the bearing capacity of the pile shoe with D=93.3mm as an example:

Test purposes

When the pile shoe is buried, the bearing capacity of the pile shoe at a certain depth can be obtained. If the soil around the pile shoe is disturbed, the strength of the soil body will decrease, and the bearing capacity of the pile shoe at the same depth will also decrease. This phenomenon can be simulated and observed by using the device of the utility model.

2. Test preparation

The test soil tank is a 2m x 2m x 2m square soil tank. Before the test starts, the sand tank is filled with sand by the sand rain method, and water is slowly injected to make the sand soil saturated. After filling the soil to the specified height, the soil surface is leveled;

According to the test situation, the installation beam type is 20a type I-beam, the loading system is installed on the beam, the installation beam is adjusted, and both ends are fixed on the outer wall of the test soil tank.

The position of the loading device system can be adjusted along the beam direction. After positioning the position of the pile shoe according to the experimental requirements, it is locked by the fixing bolts;

Mount the spud shoe model on the loading rod of the loading system.

Connect the data acquisition instrument and computer and other equipment, and debug and load the control system, sensors and computer software, that is, complete all the preparations before the test.

3. Test process control and data collection

The spud shoe model is slowly moved vertically downward through the spud shoe loading device until it is just in contact with the soil surface.

The data acquisition instrument and computer start to collect the displacement and bearing capacity data of the pile shoe at this time;

Load the system input control program to make the spud shoe shaft operate according to the steps of "primary loading penetration-static-secondary loading penetration-pull-up reset". The loading speed of the first loading penetration is 0.1mm/s, and the loading distance is 120mm; the resting time is 1200s, and the soil around the pile boots is artificially disturbed during the resting period; the penetration speed of the secondary loading is 0.1mm/s, and the loading distance is 50mm; The pull-up reset speed is 2mm/s, and the pull-up displacement is 200mm.

Pull up the pile boot until it completely leaves the soil surface, save the experimental data, organize the test equipment and turn off the power supply, and the test is over.

4. Experimental data processing

The bearing capacity-displacement curve is obtained by arranging the experimental data of the pile shoe. Comparing the bearing capacity-displacement relationship during the two loading penetrations, it can be found that the bearing capacity of the pile shoe is affected by the disturbance. In the coordinate system, taking the spacing of the pile boots as the horizontal axis and the bearing capacity as the vertical axis, the bearing capacity-displacement curve can be obtained, as shown in Figure 6.

Example 2

On the basis of Example 1, movable weighing frames are provided at both ends of the guide rails on both sides of the test soil tank, and the position of the guide rails can be changed through the movement of the weighing frames.

Example 3

On the basis of Example 1, multiple sets of loading spud shoes are set on one side of the guide rail, and tests are carried out at the same time.

The present invention has been exemplarily described above. It should be noted that, without departing from the core of the present invention, any simple deformations, modifications or other equivalent replacements that can be performed by those skilled in the art without any creative effort will fall into place. into the protection scope of the present invention.

Claims (10)

1. A movable offshore self-elevating platform pile shoe model loading test device is characterized in that: guide rail, test soil trough, loading pile shoe, sensor, data acquisition instrument and computer, and the guide rail is placed horizontally in the test soil trough. On the guide rail, a loading spud shoe that can move along the guide rail is provided, and the loading spud shoe includes a motor mounting plate and a lower backing plate for placing the motor and being clamped on the guide rail, and a penetrating motor mounting plate and a lower backing plate. The transmission mechanism includes a horizontal upper moving plate, a vertical force transmission guide rod and a horizontal lower moving plate. The lower end of the horizontal lower moving plate is provided with a flange plate, and the lower end of the flange plate is provided with a pile shoe loading rod. The lower end is provided with a stepper motor, the upper end of the stepper motor is provided with a lead screw, the lead screw passes through the motor mounting plate and is connected to the horizontal upper moving plate through the upper moving plate lead screw, and the computer is connected with the sensor through a data acquisition instrument. 2. A movable offshore jack-up platform pile shoe model loading test device according to claim 1, characterized in that: the test soil groove is in the shape of a cube. 3. A movable offshore jack-up platform pile shoe model loading test device according to claim 1, characterized in that: the depth of the test soil groove is 1-3m. 4. A movable offshore jack-up platform spud shoe model loading test device according to claim 1, wherein the guide rail is provided with a movable weighing frame. 5. A movable offshore jack-up platform spud shoe model loading test device according to claim 1, characterized in that: the lower end of the spud shoe loading rod is connected to the spud shoe model. 6. A movable offshore jack-up platform spud shoe model loading test device according to claim 1, wherein the spud shoe model is a cylinder. 7. A movable offshore jack-up platform spud shoe model loading test device according to claim 1, wherein the sensor comprises a displacement sensor and a tension-compression sensor. 8. A movable offshore jack-up platform pile shoe model loading test device according to claim 7, characterized in that: the displacement sensor is a wire-pull displacement sensor, the main body of the sensor is installed on a horizontal moving plate, and the sensor wire One end of the horizontal upper moving plate is fixed on the motor mounting plate. 9. A movable offshore jack-up platform spud shoe model loading test device according to claim 7, characterized in that: the tension and pressure sensor is an S-type strain sensor, which is installed on the spud shoe loading rod. 10. A movable offshore jack-up platform pile shoe model loading test device according to claim 1, characterized in that: the data acquisition instrument is provided with a motor driver, a motor drive transformer, a multi-axis motion controller and a The motor driver, the loading pile shoe is connected with the motor driver through the motor control line, the motor driver is connected with the motor drive transformer, the motor drive transformer and the motor driver are connected with the multi-axis motion controller, and the motor driver and the controller transformer are respectively connected with the power switch.