Indoor model test device and method for jacking deviation rectification of pile type adjustable fan foundation

Abstract

The invention belongs to the technical field of pile type adjustable fan foundations. According to the pile type adjustable draught fan foundation jacking deviation rectification indoor model test device and method, a soil body is arranged in a model box, a draught fan reduced scale model is arranged in the model box, and a draught fan foundation of the draught fan reduced scale model is buried in the soil body; a plurality of jacking mechanisms are evenly arranged at the bottom of the fan foundation in the circumferential direction, a pressure sensing element is arranged at the position, close to the edge, of the bottom of the fan foundation, a strain detection element is arranged on a pile body at the bottom of the fan foundation, and a displacement meter is fixed over the foundation edge of the upper portion of the model box. A sensing part of the displacement meter is fixed at the edge position of the foundation; the control terminal adjusts the jacking mechanism according to the received sensing data so as to perform jacking deviation correction simulation of the fan reduced scale model; according to the method, the settlement change rule, the stress change of each component of the fan and the safety in the jacking deviation correction process of the pile type adjustable foundation of the fan are explored, and jacking deviation correction can be smoothly completed.

Description

Technical Field

[0001] The invention relates to the technical field of pile-type adjustable fan foundations, and in particular to an indoor model test device and method for jacking and deviation correction of a pile-type adjustable fan foundation. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] After coal mining, many open-pit mines are left on the ground, and the land resources of the spoil dump after landfill are difficult to use. However, with the rapid development of the wind power industry, pile-type adjustable foundation wind turbines can make full use of this land resource.

[0004] At present, the number of wind turbines with adjustable pile foundations is increasing. However, it is currently impossible to conduct on-site tests on the jacking and correction of the inclined wind turbines with adjustable pile foundations, and indoor model tests on the jacking and correction of the wind turbine pile foundations have not yet been realized. It is impossible to explore the regular changes in the jacking and correction process of the wind turbine pile foundations, and there is a lack of guidance on on-site jacking and correction, which leads to greater difficulties in on-site construction and inability to smoothly achieve on-site correction. Summary of the invention

[0005] In order to address the deficiencies in the prior art, the present invention provides an indoor model test device and method for the jacking and correction of a pile-type adjustable fan foundation, which enables exploration of the settlement change law during the jacking and correction of the fan pile-type adjustable foundation, stress changes in various components of the fan, and safety, ensuring that components at various positions during the jacking and correction are in a safe state and that the jacking and correction can be completed smoothly.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides an indoor model test device for jacking up and correcting the deviation of a pile-type adjustable fan foundation.

[0008] A pile-type adjustable fan foundation lifting and deviation correction indoor model test device comprises: a model box and a fan scale model, wherein the model box is filled with soil, the fan scale model is placed in the model box, and the fan foundation of the fan scale model is buried in the soil;

[0009] The bottom of the fan foundation is uniformly arranged with a plurality of lifting mechanisms along the circumferential direction, a pressure sensing element is arranged near the edge of the bottom of the fan foundation, a strain detection element is arranged on the pile body at the bottom of the fan foundation, a displacement meter is fixed just above the foundation edge of the upper part of the model box, and the sensing part of the displacement meter is fixed at the edge of the foundation;

[0010] The pressure sensing element, strain sensing element and displacement meter are all in communication connection with the control terminal, and the control terminal adjusts the lifting mechanism according to the received sensing data to perform lifting and deviation correction simulation of the wind turbine scale model.

[0011] As a further limitation of the first aspect of the present invention, the wind turbine scale model comprises: a wind turbine foundation, a lower flange, a steel cylinder, a pile cap, a pile and a tower, the jacking mechanism adopts a jacking jack, the tower is connected to the upper part of the wind turbine foundation, the bottom of the wind turbine foundation is connected to the lower flange, and the lower flange is evenly arranged with a plurality of hollow steel cylinders along the circumferential direction;

[0012] Each hollow steel cylinder corresponds to a lifting jack, the movable end of the lifting jack is inserted into the hollow steel cylinder, the bottom of the lifting jack is fixed on the pile cap, and the bottom of the pile cap is connected with a pile.

[0013] As a further limitation of the first aspect of the present invention, the tower is connected to the upper part of the wind turbine foundation by bolts.

[0014] As a further limitation of the first aspect of the present invention, the bottom of the fan foundation is connected to the lower flange by bolts.

[0015] As a further limitation of the first aspect of the present invention, the side walls of the model box are made of transparent organic glass plates.

[0016] As a further limitation of the first aspect of the present invention, the tower is a steel tower.

[0017] As a further limitation of the first aspect of the present invention, the horizontal cross-section of the fan foundation is circular, the lower flange is annular, and the fan foundation and the lower flange are coaxially arranged.

[0018] As a further limitation of the first aspect of the present invention, a pressure sensing element is arranged between any two steel cylinders.

[0019] In a second aspect, the present invention provides a method for using the indoor model test device for lifting and correcting the pile-type adjustable fan foundation according to the first aspect, comprising the following process:

[0020] The model box is filled with standard sand of a certain depth. After the fan scale model is connected, it is inserted into the standard sand to a certain depth to keep it upright and evenly distributed. The soil is compacted when the fan scale model has a certain inclination and the inclination is less than a predetermined threshold.

[0021] Place a jack on the pile cap, connect the wind turbine foundation and the lower flange with bolts, and then dock them with the pile cap where the jack is placed. After successful docking, continue to pour in standard sand to fill the gap at the bottom of the wind turbine foundation until the standard sand covers the foundation surface and only the core column of the wind turbine foundation is exposed on the soil surface. Connect the tower and the wind turbine foundation with bolts.

[0022] In a third aspect, the present invention provides an indoor model test method for jacking and correcting the foundation of a pile-type adjustable fan, using the indoor model test device for jacking and correcting the foundation of a pile-type adjustable fan described in the first aspect of the present invention, including the following process:

[0023] At the beginning of the test, use a level to measure the fan's inclination value, and determine the number of jacking mechanisms according to the degree of fan inclination;

[0024] Start the lifting mechanism. During the lifting process, various data are monitored in real time through pressure monitoring elements, displacement meters and strain detection elements. The lifting mechanism is guided to perform lifting operations by observing the measured data feedback. The pressurization rate of the lifting mechanism is adjusted so that the lifting mechanism is lifted synchronously, slowly and uniformly during the lifting process, and each lifting mechanism is in close contact with the bottom of the wind turbine foundation.

[0025] Stop pressurizing until the gravity foundation is lifted to a horizontal position or exceeds the set value, and inject grout into the geobag at the bottom of the fan foundation through the grouting pipe. After the slurry fills the gap between the bottom of the fan foundation and the soil, wait for the slurry to solidify and reach a certain strength, then release the pressure on the lifting mechanism synchronously. At this time, the fan foundation will fall back to a certain extent, the correction is completed, the real-time monitoring is ended, the monitoring data is saved to the control terminal, and the test is over.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention places a jack at the bottom of the wind turbine pile-type adjustable foundation to perform jacking and deviation correction on the wind turbine foundation with uneven settlement. During the jacking and deviation correction process, the pressure monitoring system, displacement monitoring system and pile body axial force monitoring system are used to monitor the various components in the jacking process in real time, and the correction is guided by real-time feedback of the monitoring data, thereby accumulating rich experience and data reserves for on-site jacking and deviation correction.

[0028] 2. Through the test device proposed in the present invention, combined with the actual working conditions on site, the jacking and correction of the wind turbine pile-type adjustable foundation under different jacking positions, different load applications and different inclination degrees can be simulated, and the rules and differences can be summarized according to different working conditions.

[0029] 3. The device of the present invention is easy to use and simple to operate. It can collect test monitoring data more efficiently and provide feedback to guide the fan pile-type adjustable foundation to perform jacking and deviation correction, and has great application and promotion value.

[0030] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0032] Figure 1 An overall schematic diagram of an indoor model test device for lifting and correcting the pile-type adjustable fan foundation provided by the present invention;

[0033] Figure 2 A schematic structural diagram of a scaled model of a wind turbine provided by the present invention;

[0034] Figure 3 It is a detailed structural schematic diagram of the fan foundation of the present invention;

[0035] In the figure: 1. model box; 2. plexiglass plate; 3. fan foundation; 4. lower flange; 5. bolts; 6. steel cylinder; 7. lifting jack; 8. pile cap; 9. pile; 10. tower. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0038] In this implementation, a pile-type adjustable fan foundation 3 jacking correction indoor model test device is proposed, comprising: a model box 1 and a fan scale model, the model box 1 is filled with soil, the fan scale model is placed in the model box 1, and the fan foundation 3 of the fan scale model is buried in the soil;

[0039] The bottom of the fan foundation 3 (a gravity foundation) is evenly arranged with a plurality of lifting mechanisms along the circumferential direction, a pressure sensing element is arranged at the bottom of the fan foundation 3 near the edge, a strain detection element is arranged on the pile body at the bottom of the fan foundation 3, a displacement meter is fixed just above the foundation edge of the upper part of the model box 1, and the sensing part of the displacement meter is fixed at the foundation edge;

[0040] The pressure sensing element, strain sensing element and displacement meter are all in communication connection with the control terminal, and the control terminal adjusts the lifting mechanism according to the received sensing data to perform lifting and deviation correction simulation of the wind turbine scale model.

[0041] In this implementation, preferably, the wind turbine scale model comprises: a wind turbine foundation 3, a lower flange 4, a steel cylinder 6, a pile cap 8, a pile 9 and a tower 10, the jacking mechanism adopts a jacking jack 7, the tower 10 is connected to the upper part of the wind turbine foundation 3, the bottom of the wind turbine foundation 3 is connected to the lower flange 4, and the lower flange 4 is evenly arranged with a plurality of hollow steel cylinders 6 along the circumferential direction;

[0042] Each hollow steel cylinder 6 corresponds to a lifting jack 7 , and the movable end of the lifting jack 7 is inserted into the hollow steel cylinder 6 . The bottom of the lifting jack 7 is fixed on a pile cap 8 , and the bottom of the pile cap 8 is connected to a pile 9 .

[0043] In this implementation, preferably, the tower 10 is connected to the upper part of the wind turbine foundation 3 via bolts 5 , and the bottom of the wind turbine foundation 3 is connected to the lower flange 4 via bolts 5 .

[0044] In this implementation, optionally, the side wall of the model box 1 adopts a transparent organic glass plate 2; or, in some other implementations, other transparent materials may also be used, such as a transparent hard plastic plate, etc., which will not be repeated here.

[0045] In this implementation, optionally, the tower 10 is a steel tower 10; it is understandable that other materials may also be used, which is only used as a preference and will not be described in detail.

[0046] In this implementation, preferably, the horizontal cross-section of the fan foundation 3 is circular, the lower flange 4 is annular, and the fan foundation 3 and the lower flange 4 are coaxially arranged.

[0047] In this implementation, preferably, a pressure sensing element is arranged between any two steel cylinders 6, thereby achieving more comprehensive pressure sensing.

[0048] In this implementation, preferably, strain optical fiber sensors are arranged on both sides of the pile body at the bottom of the wind turbine foundation 3, thereby realizing strain detection of the pile body of each pile.

[0049] In this implementation, preferably, the pressure sensing element, the strain sensing element and the displacement meter are all connected to the control terminal through a data acquisition box, and the data is transmitted to the control terminal in real time through the data acquisition box.

[0050] In this implementation, when jacking is performed, the piles settle while the jacking jack 7 jacks up the fan foundation 3, and a gap is formed at the bottom of the fan foundation 3. At this time, the geobag (additional arrangement) is grouting-filled through the grouting pipe. After the slurry fills the gap between the bottom of the foundation and the soil, the slurry solidifies and reaches a certain strength, and then the jacking jack 7 is synchronously depressurized to minimize the fall value of the gravity foundation after the jacking jack 7 is depressurized.

[0051] The test device provided by the present implementation method can carry out multi-condition comparison of indoor model tests of jacking and correction of adjustable pile foundation of wind turbine, and check the stress changes of various components by jacking to different positions; check the stress changes of components under different load conditions by changing the load of the superstructure; study the influence of different types of soil; compact the soil to different degrees to achieve different soil densities and analyze the influence; and study the stress level of various components during the jacking process under different inclinations.

[0052] The installation method of the above-mentioned test device includes: a certain depth of standard sand is filled in the model box 1, and the pile is connected to the pile cap 8 and then inserted into the standard sand to a certain depth to keep it upright and evenly distributed, so as to ensure that the wind turbine scale model has a certain inclination and cannot be tilted too much. The level ruler should be used for measurement and calculation in time, and then the standard sand is buried close to the pile cap 8 to fix the pile body to avoid the pile body from being bent and deformed to a large extent or even broken when installing the concrete gravity foundation. Then the soil is compacted, and the jacking jack 7 is placed on the pile cap 8. After the wind turbine foundation 3 and the lower flange 4 are connected by bolts 5, they are docked with the pile cap 8 where the jacking jack 7 is placed. After the docking is successful, the standard sand is continued to be poured to fill the gap at the bottom of the wind turbine foundation 3 until the standard sand covers the surface of the wind turbine foundation 3 and only the core column part is exposed on the soil surface. Then the steel tower 10 is connected to the concrete wind turbine foundation 3 by bolts 5. At this point, the test device is assembled.

[0053] The test method of the above test device includes: when starting the test, first use a level ruler to measure the inclination value of the fan, determine the number of jacking jacks 7 according to the inclination degree of the fan scale model, when the inclination degree is large, jack up five jacking jacks 7 simultaneously, and when the inclination degree is small, jack up three jacking jacks 7 simultaneously, open the control terminal, set the data transmission path, and then start the jacking jack 7. During the jacking period, various data are monitored in real time through pressure sensing elements, strain detection elements and displacement meters, and the jacking operation of the jacking jack 7 is guided by observing the measured data feedback, and the lifting pressure of the jacking jack 7 is adjusted. The pressure rate is set to ensure that the lifting jacks 7 are lifted synchronously, slowly and uniformly during the lifting process; each lifting jack 7 is in close contact with the foundation bottom plate until the gravity foundation is lifted to a horizontal position or a little over the top, then the pressure is stopped, and the grouting is filled into the geobag through the grouting pipe. After the slurry fills the gap between the bottom of the foundation and the soil as much as possible, the slurry is solidified and reaches a certain strength, and then the lifting jacks 7 are synchronously depressurized. At this time, the foundation produces a certain degree of fall back, the correction is completed, the real-time monitoring is ended, and the monitoring data is saved to the control host. At this point, the indoor model test of the fan pile type adjustable foundation jacking correction is completed.

[0054] In summary, the present invention places a lifting jack 7 at the bottom of the wind turbine pile type adjustable foundation, performs lifting and deviation correction on the wind turbine foundation 3 with uneven settlement, and monitors the various components in the lifting process in real time through pressure sensing elements, strain detection elements and displacement meters during the lifting and deviation correction process, and provides guidance for deviation correction through real-time feedback of monitoring data, thereby accumulating rich experience and data reserves for on-site lifting and deviation correction; through this test device, combined with actual on-site working conditions, the lifting and deviation correction of the wind turbine pile type adjustable foundation under different lifting positions, different load applications and different inclination degrees can be simulated, and the rules and differences can be summarized according to different working conditions; the present invention is easy to use and simple to operate, can collect test monitoring data more efficiently, and can provide feedback to guide the lifting and deviation correction of the wind turbine pile type adjustable foundation, and has great application and promotion value.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pile-type adjustable fan foundation lifting and correction indoor model test device, characterized in that: include: A model box and a scaled model of a wind turbine, wherein the model box is filled with soil, the scaled model of the wind turbine is placed in the model box, and the wind turbine foundation of the scaled model of the wind turbine is buried in the soil; The bottom of the fan foundation is uniformly arranged with a plurality of lifting mechanisms along the circumferential direction, a pressure sensing element is arranged near the edge of the bottom of the fan foundation, a strain detection element is arranged on the pile body at the bottom of the fan foundation, a displacement meter is fixed just above the foundation edge of the upper part of the model box, and the sensing part of the displacement meter is fixed at the edge of the foundation; The pressure sensing element, strain sensing element and displacement meter are all in communication connection with the control terminal, and the control terminal adjusts the lifting mechanism according to the received sensing data to perform lifting and deviation correction simulation of the wind turbine scale model.

2. The indoor model test device for lifting and correcting the pile-type adjustable fan foundation according to claim 1 is characterized in that: The wind turbine scale model comprises: a wind turbine foundation, a lower flange, a steel cylinder, a pile cap, a pile and a tower. The lifting mechanism adopts a lifting jack. The tower is connected to the upper part of the wind turbine foundation. The bottom of the wind turbine foundation is connected to the lower flange. The lower flange has a plurality of hollow steel cylinders evenly arranged along the circumferential direction. Each hollow steel cylinder corresponds to a lifting jack, the movable end of the lifting jack is inserted into the hollow steel cylinder, the bottom of the lifting jack is fixed on the pile cap, and the bottom of the pile cap is connected with a pile.

3. The indoor model test device for lifting and correcting the pile-type adjustable fan foundation according to claim 2 is characterized in that: The tower is connected to the upper part of the wind turbine foundation by bolts.

4. The indoor model test device for lifting and correcting the pile-type adjustable fan foundation according to claim 2 is characterized in that: The bottom of the fan foundation is connected to the lower flange by bolts.

5. The indoor model test device for lifting and correcting the pile-type adjustable fan foundation according to claim 2 is characterized in that: The side walls of the model box are made of transparent organic glass plates.

6. The indoor model test device for lifting and correcting the pile-type adjustable fan foundation according to any one of claims 1 to 5, characterized in that: The tower is a steel tower.

7. The indoor model test device for lifting and correcting the pile-type adjustable fan foundation according to any one of claims 1 to 5, characterized in that: The horizontal cross-section of the fan foundation is circular, the lower flange is annular, and the fan foundation and the lower flange are coaxially arranged.

8. The indoor model test device for lifting and correcting the pile-type adjustable fan foundation according to any one of claims 1 to 5, characterized in that: A pressure sensing element is arranged between any two steel cylinders.

9. A method for using the indoor model test device for lifting and correcting the pile-type adjustable fan foundation according to any one of claims 2 to 5, characterized in that: The model box is filled with standard sand of a certain depth. After the fan scale model is connected, it is inserted into the standard sand to a certain depth to keep it upright and evenly distributed. The soil is compacted when the fan scale model has a certain inclination and the inclination is less than a predetermined threshold. Place a jack on the pile cap, connect the wind turbine foundation and the lower flange with bolts, and then dock them with the pile cap where the jack is placed. After successful docking, continue to pour in standard sand to fill the gap at the bottom of the wind turbine foundation until the standard sand covers the foundation surface and only the core column of the wind turbine foundation is exposed on the soil surface. Connect the tower and the wind turbine foundation with bolts.

10. An indoor model test method for jacking and correcting the pile-type adjustable fan foundation, characterized in that: The indoor model test device for lifting and correcting the pile-type adjustable fan foundation according to any one of claims 1 to 8 includes the following steps: At the beginning of the test, use a level to measure the fan's inclination value, and determine the number of jacking mechanisms according to the degree of fan inclination; Start the lifting mechanism. During the lifting process, various data are monitored in real time through pressure monitoring elements, displacement meters and strain detection elements. The lifting mechanism is guided to perform lifting operations by observing the measured data feedback. The pressurization rate of the lifting mechanism is adjusted so that the lifting mechanism is lifted synchronously, slowly and uniformly during the lifting process, and each lifting mechanism is in close contact with the bottom of the wind turbine foundation. Stop pressurizing until the gravity foundation is lifted to a horizontal position or exceeds the set value, and inject grout into the geobag at the bottom of the fan foundation through the grouting pipe. After the slurry fills the gap between the bottom of the fan foundation and the soil, wait for the slurry to solidify and reach a certain strength, then release the pressure on the lifting mechanism synchronously. At this time, the fan foundation will fall back to a certain extent, the correction is completed, the real-time monitoring is ended, the monitoring data is saved to the control terminal, and the test is over.

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