Device and method for monitoring long-term physical state of soft soil of PHC pipe pile foundation

Abstract

The invention relates to the technical field of ocean engineering monitoring, and discloses a PHC pipe pile foundation soft soil long-term physical state monitoring device and method.The PHC pipe pile foundation soft soil long-term physical state monitoring device comprises a plurality of measuring pipe bodies, a sealing plate is installed at the bottom end of each measuring pipe body, and the measuring pipe bodies stretch into the peripheral side mud face of a PHC pipe pile; the monitoring assembly comprises a plurality of mounting parts and a plurality of monitoring parts, the plurality of mounting parts are mounted on the measuring tube main body along the axial direction, and the plurality of monitoring parts are respectively mounted on the plurality of mounting parts; the cable channel is formed in the measuring tube main body, and cables of the monitoring piece penetrate through the cable channel and extend out of the measuring tube main body to be connected with an external data acquisition instrument; and the waterproof structure is used for waterproofing the cable. According to the invention, land-sea modular construction, sensor anti-construction strong soil pressure protection and pipe body strength are realized. By optimizing the pipe body structure and the connection mode, rapid installation and maintenance are achieved, and the durability and reliability of the monitoring system are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering monitoring, and in particular to a device and method for monitoring the long-term physical state of soft soil in a PHC pile foundation. Background Art

[0002] With the vigorous development of marine renewable energy, the construction scale of marine photovoltaic power stations is expanding. PHC pipe piles are widely used in pile foundation projects of marine photovoltaic power stations due to their good mechanical properties and economy. However, the complex and harsh marine environment, the strong corrosiveness of seawater, the periodic changes of tides, and the poor mechanical properties of seabed soil, etc., bring great challenges to the long-term stability of pile foundations. Accurately grasping the stress state and pore water pressure changes before and after pile foundation construction and during service is crucial to evaluating the bearing capacity and safety performance of pile foundations. At present, the existing pile foundation monitoring technology has many problems in the marine environment. On the one hand, traditional monitoring devices are mostly assembled on site, which is difficult to construct at sea, takes a long time to operate, and is significantly affected by harsh sea conditions, which not only increases the construction cost, but also makes it difficult to ensure the construction quality. On the other hand, the protection and installation structure design of the sensor is unreasonable. During the process of pressing the pipe pile into the soil, the sensor is easily damaged by impact, resulting in inaccurate or interrupted monitoring data. At the same time, the wiring method of the existing monitoring device easily exposes the cable to the harsh environment, which is eroded by seawater and mechanically damaged, and has poor waterproof performance, which cannot meet the requirements of long-term stable monitoring.

[0003] Therefore, there is an urgent need for a long-term physical state monitoring device and method for soft soil in a PHC pile foundation to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for monitoring the long-term physical state of soft soil in a PHC pile foundation, so as to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a long-term physical state monitoring device for soft soil in a PHC pile foundation, comprising:

[0006] Several measuring tube bodies, with sealing plates installed at the bottom ends, the measuring tube bodies extend into the mud surface around the PHC pile;

[0007] A monitoring assembly, comprising a plurality of mounting parts and a plurality of monitoring parts, wherein the plurality of mounting parts are axially mounted on the measuring tube body, and the plurality of monitoring parts are respectively mounted on the plurality of mounting parts;

[0008] A cable channel is provided in the measuring tube body, and the cables of the monitoring components all pass through the cable channel and extend out of the measuring tube body to be connected with an external data acquisition instrument;

[0009] The waterproof structure is used to waterproof the cables.

[0010] A long-term physical state monitoring device for soft soil of PHC pipe pile foundation provided by the present invention. The installation part includes an earth pressure gauge installation base plate and a piezometer fixing angle steel. The earth pressure gauge installation base plate and the piezometer fixing angle steel are respectively installed on the main body of the measuring pipe, and the earth pressure gauge installation base plate is located above the piezometer fixing angle steel. The monitoring part is installed on the earth pressure gauge installation base plate and the piezometer fixing angle steel.

[0011] A long-term physical state monitoring device for soft soil of PHC pipe pile foundation provided by the present invention. The monitoring part includes an earth pressure gauge and a piezometer. The earth pressure gauge is installed on the earth pressure gauge installation base plate, and the piezometer is installed on the piezometer fixing angle steel.

[0012] A long-term physical state monitoring device for soft soil of PHC pipe pile foundation provided by the present invention. A plurality of data line inlets are axially opened on the main body of the measuring pipe. The plurality of data line inlets are respectively located above the plurality of earth pressure gauge installation base plates. The data transmission lines on the earth pressure gauge and the piezometer extend into the cable channel through the data line inlets.

[0013] A long-term physical state monitoring device for soft soil of PHC pipe pile foundation provided by the present invention. A data transmission line outlet is opened at the top of the side part of the main body of the measuring pipe. The data transmission line extends out of the main body of the measuring pipe through the data transmission line outlet.

[0014] A long-term physical state monitoring device for soft soil of PHC pipe pile foundation provided by the present invention. A strengthening angle steel is fixedly connected to one side of the outer wall of the main body of the measuring pipe far away from the data line inlet.

[0015] A long-term physical state monitoring device for soft soil of PHC pipe pile foundation provided by the present invention. A plurality of fixing screw holes are circumferentially arranged on the earth pressure gauge installation base plate. Bolts are arranged in the fixing screw holes. The earth pressure gauge is installed on the earth pressure gauge installation base plate through the plurality of bolts.

[0016] A long-term physical state monitoring device for soft soil of PHC pipe pile foundation provided by the present invention. Two positioning grooves are opened on the vertical surface of the piezometer fixing angle steel.

[0017] A long-term physical state monitoring device for soft soil of PHC pipe pile foundation provided by the present invention. The waterproof structure includes a waterproof joint and a four-core shielded cable.

[0018] A method for long-term physical state monitoring of soft soil of PHC pipe pile foundation includes the following steps:

[0019] Assemble the device on land;

[0020] Press the assembled device into the mud surface around the PHC pipe pile;

[0021] After installation, use a measuring scale to check the plane positioning error.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects:

[0023] A long-term physical state monitoring device and method for PHC pipe pile foundation in soft soil provided by the present invention, when in use, a sealing plate is installed at the bottom end of the measuring pipe main body, several installation parts are installed on the measuring pipe main body along the axial direction, the monitoring parts are installed on the installation parts for monitoring various parameters, and at the same time, the cable is located in the cable channel for closed protection. The measuring pipe main body extends into the mud surface to realize synchronous and accurate monitoring of earth pressure and pore water pressure. This application realizes onshore prefabrication and assembly of the device, and the whole device is pressed into the soft soil seabed during offshore construction, significantly reducing the offshore construction difficulty and operation time; adopts the inner cavity wiring structure of the pipe, and realizes full closed protection of the line by opening a special cable channel; through the synergistic effect of the multi-stage axially distributed sensor group, the hierarchical pressing process and the waterproof system, realizes synchronous and accurate monitoring of earth pressure and pore water pressure, and the survival rate of the device reaches 98%; the integrity rate of the measured data exceeds 95%. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0025] Figure 1 It is the overall distribution schematic diagram of the present invention;

[0026] Figure 2 It is the front view of the measuring pipe main body of the present invention;

[0027] Figure 3 It is the side view of the measuring pipe main body of the present invention;

[0028] Figure 4 It is the schematic diagram of the earth pressure gauge installation base plate structure of the present invention;

[0029] Figure 5 It is the schematic diagram of the osmometer fixing angle steel structure of the present invention;

[0030] Figure 6 It is the data graph of the earth pressure and pore water pressure collected by the device of the present invention changing with time;

[0031] Among them, 1. PHC pipe pile; 2. Measuring pipe body; 3. Data transmission line outlet; 4. Data transmission line; 5. Reinforcing angle steel; 6. Earth pressure gauge installation base plate; 7. Piezometer fixing angle steel; 8. Data line inlet; 9. Sealing plate; 10. Fixed screw hole; 11. Earth pressure gauge; 12. Positioning groove; 13. Piezometer. Specific implementation mode

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0033] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation modes.

[0034] Refer to Figures 1-6 , the present invention provides a long-term physical state monitoring device for soft soil of PHC pipe pile foundation, including:

[0035] A number of measuring pipe bodies 2, with a sealing plate 9 installed at the bottom end, and the measuring pipe bodies 2 extend into the mud surface on the periphery of the PHC pipe pile 1;

[0036] A monitoring component, including a number of installation parts and a number of monitoring parts, the number of installation parts are installed on the measuring pipe body 2 along the axial direction, and the number of monitoring parts are respectively installed on the number of installation parts;

[0037] A cable channel is opened in the measuring pipe body 2, and the cables of the monitoring parts all pass through the cable channel and extend out of the measuring pipe body 2 to be connected to an external data collector;

[0038] A waterproof structure for waterproofing the cables.

[0039] In one embodiment of the present invention, during use, a sealing plate 9 is installed at the bottom end of the measuring pipe body 2, a number of installation parts are installed on the measuring pipe body 2 along the axial direction, the monitoring parts are installed on the installation parts to monitor various parameters, and at the same time, the cables are located in the cable channel for closed protection, realizing synchronous and accurate monitoring of earth pressure and pore water pressure.

[0040] In a further optimized solution, the installation parts include an earth pressure gauge installation base plate 6 and a piezometer fixing angle steel 7. The earth pressure gauge installation base plate 6 and the piezometer fixing angle steel 7 are respectively installed on the measuring pipe body 2, and the earth pressure gauge installation base plate 6 is located above the piezometer fixing angle steel 7. The monitoring parts are installed on the earth pressure gauge installation base plate 6 and the piezometer fixing angle steel 7.

[0041] In one embodiment of the present invention, the earth pressure gauge mounting substrate 6 is fixed on the main body 2 of the measuring tube. A number of earth pressure gauge mounting substrates 6 are in the same plane, and the perpendicularity deviation from the axis of the tube body is <10°. The osmotic pressure gauge fixing angle steel 7 adopts a double-sided continuous welding process, so that the long axis of the angle steel is perpendicular to the axis of the main body 2 of the measuring tube, extending upward on one side and extending outward from the axis of the main body 2 of the measuring tube upward on the other side to form a sensor mounting platform.

[0042] In a further optimized solution, the monitoring components include an earth pressure gauge 11 and an osmotic pressure gauge 13. The earth pressure gauge 11 is installed on the earth pressure gauge mounting substrate 6, and the osmotic pressure gauge 13 is installed on the osmotic pressure gauge fixing angle steel 7.

[0043] In one embodiment of the present invention, the earth pressure gauge 11 is installed on the earth pressure gauge mounting substrate 6, and the osmotic pressure gauge 13 is installed on the osmotic pressure gauge fixing angle steel 7, and double fixing is implemented using 316 stainless steel cable ties.

[0044] In a further optimized solution, a number of data line inlets 8 are axially provided on the main body 2 of the measuring tube. The number of data line inlets 8 are respectively located above a number of earth pressure gauge mounting substrates 6, and the data transmission lines 4 on the earth pressure gauge 11 and the osmotic pressure gauge 13 extend into the cable channel through the data line inlets 8.

[0045] In one embodiment of the present invention, a number of cables are introduced into the main body 2 of the measuring tube through the provided data line inlets 8.

[0046] In a further optimized solution, a data transmission line outlet 3 is provided at the top of the side of the main body 2 of the measuring tube, and the data transmission line 4 extends out of the main body 2 of the measuring tube through the data transmission line outlet 3.

[0047] In one embodiment of the present invention, all the data transmission lines 4 extend out of the main body 2 of the measuring tube through the data transmission line outlet 3.

[0048] In a further optimized solution, a reinforcing angle steel is fixedly connected to the side of the main body 2 of the measuring tube away from the data line inlet 8.

[0049] In one embodiment of the present invention, the overall strength is further ensured by providing a reinforcing angle steel on the back side of the re-opening.

[0050] In a further optimized solution, a number of fixing screw holes 10 are circumferentially provided on the earth pressure gauge mounting substrate 6. Bolts are provided in the fixing screw holes 10, and the earth pressure gauge 11 is installed on the earth pressure gauge mounting substrate 6 through a number of bolts.

[0051] In one embodiment of the present invention, the fixing screw holes 10 are preferably three, and the earth pressure gauge 11 is fixed to the earth pressure gauge mounting substrate 6 through stainless steel bolts, and three-point mounting is adopted to ensure uniform stress.

[0052] For a further optimized solution, two positioning grooves 12 are provided on the vertical surface of the osmotic pressure gauge fixing angle steel 7.

[0053] In an embodiment of the present invention, two positioning grooves 12 are provided on the vertical surface of the osmotic pressure gauge fixing angle steel 7 for positioning and installation.

[0054] For a further optimized solution, the waterproof structure includes a waterproof joint and a four-core shielded cable.

[0055] In an embodiment of the present invention, a waterproof wiring cabin is provided at the top of the pipe. A four-core shielded cable is led out by using a waterproof joint, and the cable terminal is connected to a multi-channel data acquisition instrument with the model of HBM-SPM21. The sampling frequency is set to 10 Hz. The pressure is maintained for 30 minutes under a water pressure of 2 m to ensure that the sealing performance meets the standard.

[0056] A method for long-term physical state monitoring of PHC pipe pile foundations in soft soil includes the following steps:

[0057] Assemble the device on land;

[0058] Press the assembled device into the mud surface around the PHC pipe pile 1;

[0059] After installation, use a measuring scale to check the plane positioning error.

[0060] In an embodiment of the present invention, during use, the whole device is prefabricated and assembled on land and then constructed at sea. During the sea construction, a water excavator is used in cooperation with a guiding wire to vertically press the main body 2 of the measuring pipe into the mud surface below the pile circumference. The press-in type is implemented by grading press-in, that is, pause for 2 minutes every 2 m of press-in, monitor the verticality deviation of the pipe body, and control it within ≤10°. When the final press-in depth reaches the design elevation of -6.0 m, the installation is completed. After installation, use a measuring scale to check the position, and control the plane positioning error within ≤50 mm. The waterproof performance and functionality of the whole system are verified under the change of tidal water level. The system survival rate can reach 98%, and the data acquisition integrity rate exceeds 95%.

[0061] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0062] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A long-term physical state monitoring device for PHC pipe pile foundations in soft soil, characterized in that, Comprising: A number of measuring tube bodies (2) with a sealing plate (9) installed at the bottom end, and the measuring tube bodies (2) extend into the mud surface on the circumferential side of the PHC pipe pile (1); A monitoring assembly, including a number of mounting parts and a number of monitoring parts. The number of mounting parts are axially installed on the measuring tube body (2), and the number of monitoring parts are respectively installed on the number of mounting parts; A cable channel is opened in the measuring tube body (2), and the cables of the monitoring parts all pass through the cable channel and extend out of the measuring tube body (2) to be connected to an external data collector; A waterproof structure for waterproofing the cables.

2. The long-term physical state monitoring device for PHC pipe pile foundation in soft soil according to claim 1, wherein: The mounting part includes an earth pressure gauge mounting substrate (6) and a piezometer fixing angle steel (7). The earth pressure gauge mounting substrate (6) and the piezometer fixing angle steel (7) are respectively installed on the measuring tube body (2), and the earth pressure gauge mounting substrate (6) is located above the piezometer fixing angle steel (7), and the monitoring part is installed on the earth pressure gauge mounting substrate (6) and the piezometer fixing angle steel (7).

3. A long-term physical state monitoring device for PHC pipe pile foundation in soft soil according to claim 2, characterized in that: The monitoring part includes an earth pressure gauge (11) and a piezometer (13). The earth pressure gauge (11) is installed on the earth pressure gauge mounting substrate (6), and the piezometer (13) is installed on the piezometer fixing angle steel (7).

4. The long-term physical state monitoring device for PHC pipe pile foundation in soft soil according to claim 3, characterized in that: A number of data line inlets (8) are axially opened on the measuring tube body (2), and the number of data line inlets (8) are respectively located above the number of earth pressure gauge mounting substrates (6). The data transmission lines (4) on the earth pressure gauge (11) and the piezometer (13) extend into the cable channel through the data line inlets (8).

5. The long-term physical state monitoring device for PHC pipe pile foundation in soft soil according to claim 4, characterized in that: A data transmission line outlet (3) is opened at the top of the side of the measuring tube body (2), and the data transmission line (4) extends out of the measuring tube body (2) through the data transmission line outlet (3).

6. The long-term physical state monitoring device for PHC pipe pile foundation in soft soil according to claim 4, characterized in that: A reinforcing angle steel is fixedly connected to one side of the outer wall of the measuring tube body (2) far from the data line inlet (8).

7. The long-term physical state monitoring device for PHC pipe pile foundation in soft soil according to claim 3, wherein: A number of fixing screw holes (10) are circumferentially arranged on the earth pressure gauge mounting substrate (6), bolts are arranged in the fixing screw holes (10), and the earth pressure gauge (11) is installed on the earth pressure gauge mounting substrate (6) through the number of bolts.

8. The long-term physical state monitoring device for PHC pipe pile foundation in soft soil according to claim 2, characterized in that: Two positioning grooves (12) are opened on the vertical surface of the piezometer fixing angle steel (7).

9. The long-term physical state monitoring device for PHC pipe pile foundation in soft soil according to claim 1, wherein: The waterproof structure includes a waterproof joint and a four-core shielded cable.

10. A method for long-term physical state monitoring of soft soil in PHC pipe pile foundations, applicable to the long-term physical state monitoring device of soft soil in PHC pipe pile foundations described in claim 1, characterized in that, Including the following steps: Assemble the device on land; Press the assembled device into the mud surface around the PHC pipe pile (1); After installation, use a measuring scale to check the plane positioning error.

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