Energy pile visual heat prediction system and maintenance pile position rapid confirmation method

Abstract

The invention provides an energy pile visual heat prediction system and a maintenance pile position rapid confirmation method. According to the method, a three-dimensional energy pile soil model is established through a construction drawing, initial ground temperature testing is combined, heat conduction simulation is conducted through FLAC3D, and energy pile heat field distribution is monitored in real time. The system establishes a pile group water pipe network temperature control network, a temperature sensor is installed, heat prediction is corrected according to real-time data, and energy pile working state monitoring and abnormal rapid positioning are achieved. According to the energy pile visual heat prediction system and the maintenance pile position rapid confirmation method, the safety and the high efficiency of an energy pile project are improved, daily maintenance work of the energy pile is facilitated, the extreme weather and temperature influence can be dealt with in time, and an effective solution is provided for energy-saving transformation of newly-built and existing buildings.

Description

Technical Field

[0001] The invention belongs to the technical field of numerical analysis of geotechnical engineering, and relates to a visualized heat prediction system for energy piles and a method for quickly confirming the position of maintenance piles. Background Art

[0002] Shallow geothermal resources under the surface, as an environmentally friendly form of energy, have a wide range of application value. Energy piles, as a new type of geothermal source pump technology that utilizes shallow geothermal heat, combine the two functions of pile foundation and geothermal pump. Therefore, while exerting its heat exchange capacity, it is also necessary to ensure that its load-bearing performance as a pile foundation is guaranteed. However, compared with ordinary pile foundations, energy piles are not only restricted by the upper load of the building and the rock and soil around the piles, but also expand or contract due to the influence of temperature and are also affected by temperature stress. This results in a more complex form of force on the energy pile during use, and its safety and operating efficiency have become core issues. Therefore, it is very urgent to perform visual thermal monitoring of energy piles.

[0003] FLAC3D (3D Fast Lagrangian Analysis Code) is an excellent geotechnical engineering numerical simulation software. FLAC3D is based on the Lagrangian algorithm and uses the finite difference method as the calculation method. FLAC3D has powerful post-processing functions and supports five calculation methods such as static analysis, dynamic analysis, creep, seepage and temperature change. It is widely used in many fields such as transportation, water conservancy, geology, petroleum and environmental protection. Summary of the invention

[0004] The present invention establishes a three-dimensional model of energy piles and soil through FLAC3D, establishes a system for rapid positioning of energy pile positions and visualized heat prediction, quickly and efficiently manages and monitors the energy pile group system, and monitors the energy pile heat field distribution in real time through the visualized heat prediction system, and monitors the energy pile working conditions in real time, providing important control guidance support for the safety and efficiency of energy pile engineering applications.

[0005] The present invention adopts the following technical solutions to achieve the above-mentioned invention object: A visual heat prediction system for energy piles includes the following steps Step 1: Determine the size and length of the pile according to the construction engineering drawing information, and establish a three-dimensional energy pile-soil model; Step 2: After the model is established, the initial stress field is generated, the pile is buried, the temperature field is applied, and the pile top load is loaded; Step 3: Process the on-site pile position coordinates according to the three-dimensional energy pile group model, set the pile number, enter the pile number engineering information and upload it to the system, and establish a database for each pile for management.

[0006] Before step 1, the following steps are also included: Carry out initial ground temperature test at the construction site and record the soil thermal conductivity. Carry out ground temperature test again after the energy pile is working and record the new soil thermal conductivity to determine the thermal conductivity parameters of the energy pile model.

[0007] The soil part in the pile-soil model is simulated using the Mohr-Coulomb model.

[0008] The main body of the pipe pile is constructed using a homogeneous isotropic elastic model.

[0009] The pipe pile model is constructed using a cylindrical shell mesh.

[0010] The soil mass surrounding the piles is set using a gradient radial grid around the perimeter of the cylindrical tunnel.

[0011] Specifically, the temperature field is applied in FLAC3D through the heat conduction mode and various heat conduction parameters are set.

[0012] The heat conduction parameters include specific heat capacity, thermal conductivity, and thermal expansion coefficient.

[0013] A method for quickly confirming the position of maintenance piles based on the above-mentioned visual heat prediction system for energy piles is characterized by establishing a temperature control network for the water supply network of energy pile groups, installing temperature sensors at the water inlet pipes on the tops of the energy piles and at the water inlet tanks, and correcting the energy pile position quickly and the visual heat prediction system based on the real-time data of the temperature sensors of the energy pile water inlet tanks and the water supply network.

[0014] The method for quickly confirming the maintenance pile position comprises the following specific steps: A temperature control network for the water supply network of energy pile groups is established, and temperature sensors are installed at the water inlet pipes on the tops of the energy piles and at the water inlet tanks. The energy pile heat prediction system is corrected based on the real-time surface temperature and the real-time data of the temperature sensors of the energy pile water inlet tanks and water supply network. The heat diffusion of the energy piles is visualized, the working status of the energy pile system is monitored, and the engineering information and historical data results of pile numbers with abnormal status are obtained. The real-time data is compared with the heat prediction system to locate the pile position, pile number and engineering report of the abnormal energy piles to solve safety problems.

[0015] The present invention has the following beneficial effects compared with the prior art: The present invention establishes a three-dimensional model of energy pile soil through FLAC3D, establishes a system for rapid positioning of energy pile positions and visual heat prediction, and manages and monitors the energy pile group system quickly and efficiently, which is convenient for daily maintenance of energy piles. Through the visual heat prediction system, the heat field distribution of the energy pile can be monitored in real time, the working condition of the energy pile can be monitored in real time, and the impact of extreme weather temperatures can be coped with, providing important control guidance support for the safety and efficiency of the energy pile project. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A simplified flow chart of the energy pile position rapid positioning and visualized heat prediction system of the present invention; Figure 2 It is a detailed flow chart of the energy pile position rapid positioning and visualized heat prediction system of the present invention.

[0017] Figure 3 The energy pile model temperature field distribution model is a prediction system for the heat distribution of the temperature field of a single energy pile under different initial ground temperatures.

[0018] Figure 4 is the temperature field distribution of the energy pile group model under the initial ground temperature (10℃).

[0019] Figure 5 It is the temperature field distribution of the energy pile group model under working condition (40℃). DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] like Figure 1 As shown, the present invention provides an energy pile visual heat prediction system and a maintenance pile position rapid confirmation method, comprising the following steps: According to the construction engineering drawing information, determine the size and length of the pile, and establish a three-dimensional energy pile-soil model; Set the pile number according to the pile position coordinates, generate the pile number engineering information report and upload it to the energy pile position rapid positioning and visual heat prediction system; Establish a temperature control network for the water supply pipelines of energy pile groups, install temperature sensors at the water inlet pipes on the tops of the energy piles and at the water inlet tanks, correct the energy pile position rapid positioning and visual heat prediction system based on the real-time data of the temperature sensors of the energy pile water inlet tanks and the water supply pipelines, and monitor the safety of the energy pile system.

[0022] Furthermore, before determining the pipe pile size and pile length according to the construction engineering drawing information and establishing the three-dimensional energy pile-soil model, the method further includes: Carry out initial ground temperature test at the construction site and record the soil thermal conductivity. Carry out ground temperature test again after the energy pile is working and record the new soil thermal conductivity to facilitate the selection and determination of thermal conductivity parameters of the energy pile model.

[0023] Furthermore, the pile number is set according to the pile position coordinates, and a pile number engineering information report is generated and uploaded to the energy pile position rapid positioning and visual heat prediction system, specifically including: The energy pile group model generated by FLAC3D finite element software is used to process the on-site pile position coordinates and set the pile numbers. At the same time, the pile number engineering information is entered and uploaded to the management system, and a database of each pile is established for management.

[0024] Furthermore, the energy pile group water pipe network temperature control network is established, and temperature sensors are installed at the water inlet pipes and water tanks on the top of the energy piles. According to the real-time data of the temperature sensors of the water inlet tanks and water pipe networks of the energy piles, the energy pile position rapid positioning and visual heat prediction system are corrected, and the energy pile system is monitored for safe operation, specifically including: A temperature control network for the water supply network of energy pile groups is established, and temperature sensors are installed at the water inlet pipes on the tops of the energy piles and at the water inlet tanks. The energy pile heat prediction system is corrected based on the real-time surface temperature and the real-time data of the temperature sensors of the energy pile water inlet tanks and water supply network, so as to realize the visualization of the heat diffusion of the energy piles. At the same time, the working status of the energy pile system is also monitored, so that the engineering information and historical data results of the pile numbers with abnormal status can be quickly obtained. By comparing the real-time data with the heat prediction system, the pile position, pile number and engineering report of the abnormal energy piles can be located, so as to quickly and accurately solve the safety problems and realize the convenient and accurate maintenance of the energy piles.

[0025] The present invention discloses a visual heat prediction system for energy piles and a method for quickly confirming the maintenance pile position, and the steps are as follows: according to the construction engineering drawing information, the pipe pile size and pile length are determined, and a three-dimensional energy pile soil model is established; the pile number is set according to the pile position coordinates, and a pile number engineering information report is generated and uploaded to the energy pile position rapid positioning and visual heat prediction system. Considering that in the process of heat transfer, the temperature field of each pile in the pile group will interact with each other, a temperature control network of the energy pile group water supply pipe network is established, and temperature sensors are installed at the water inlet pipe on the top of the energy pile and the water inlet tank. According to the real-time data of the temperature sensors of the initial ground temperature, the energy pile water inlet tank and the water supply pipe network, the energy pile visual heat prediction system is corrected, and the energy pile visual heat prediction system is monitored for safe operation, and the normal operation of the energy pile is efficiently checked and repaired; by comparing the real-time data through the heat prediction system, the pile position, pile number and engineering report of the abnormal energy pile are located, and the safety problem is solved quickly and accurately.

[0026] The present invention establishes a three-dimensional model of energy piles and soil through FLAC3D, establishes a visualized heat prediction system for energy piles and a method for quickly confirming maintenance pile positions, and manages and monitors the energy pile group system quickly and efficiently, facilitating daily maintenance of energy piles. Through the visualized heat prediction system, the heat field distribution of energy piles can be monitored in real time, and adjustments can be made in response to extreme weather temperatures, providing important control guidance support for the safety and efficiency of daily use of energy pile projects. Example

[0027] The present invention establishes a three-dimensional model of energy piles and soil through FLAC3D, establishes a system for rapid positioning of energy pile positions and visualized heat prediction, quickly and efficiently manages and monitors the energy pile group system, and monitors the energy pile heat field distribution in real time through the visualized heat prediction system, and monitors the energy pile working conditions in real time, providing important control guidance support for the safety and efficiency of energy pile engineering applications.

[0028] like Figure 2 As shown, a system for quickly locating energy pile positions and visualizing heat prediction is provided, and the steps are as follows: (1) Determine the size and length of the pile according to the construction engineering drawings and establish a three-dimensional energy pile-soil model; (2) After the model is established, the initial stress field is generated, the pile is buried, the temperature field is applied, and the pile top load is loaded; (3) Set the pile number according to the pile position coordinates, generate the pile number engineering information report and upload it to the energy pile position rapid positioning and visual heat prediction system; (4) Establish a temperature control network for the water supply network of energy pile groups, install temperature sensors at the water inlet pipes on the top of the energy piles and at the water inlet tanks, and correct the energy pile position rapid positioning and visual heat prediction system based on the real-time data of the temperature sensors of the energy pile water inlet tanks and water supply network, and monitor the safety of the energy pile system.

[0029] Before step (1), the method further includes: conducting an initial ground temperature test at the construction site to record the thermal conductivity of the soil; conducting another ground temperature test after the energy pile is working to record the new thermal conductivity of the soil, so as to facilitate the selection and determination of the thermal conductivity parameters of the energy pile model.

[0030] In the step (2), the soil part of the pile-soil model is simulated by the Mohr-Coulomb model, and the main body of the pipe pile is constructed by the homogeneous isotropic elastic model (Elastic, Isotropic Model); In the step (2), the pipe pile model is constructed by a cylindrical shell grid (cshell), and the soil surrounding the pipe pile is set by a gradient radial grid (radcylinder) outside the cylindrical tunnel. In the process of building the model, commands such as symmetric flipping can be used to complete the establishment of the overall pile-soil model in sequence; In the step (2), a temperature field is applied in FLAC3D through a heat conduction mode, and various heat conduction parameters such as specific heat capacity, thermal conductivity, and thermal expansion coefficient are set.

[0031] In the step (3), the energy pile group model generated by the FLAC3D finite element software is used to process the on-site pile position coordinates, and the pile number is set. At the same time, the pile number engineering information is entered and uploaded to the management system, and a database of each pile is established for management.

[0032] In the step (4), a temperature control network of the energy pile group water supply network is established, and temperature sensors are installed at the water inlet pipes on the tops of the energy piles and at the water inlet tanks. The energy pile heat prediction system is corrected according to the real-time surface temperature and the real-time data of the temperature sensors of the energy pile water inlet tank and the water supply network, so as to realize the visual display of the heat diffusion of the energy piles. At the same time, the working status of the energy pile system is also monitored, so that the engineering information and historical data results of the pile numbers with abnormal status can be quickly obtained. By comparing the real-time data with the heat prediction system, the pile position, pile number and engineering report of the abnormal energy pile can be located, so as to quickly and accurately solve the safety problem and realize the convenient and accurate maintenance of the energy piles.

[0033] Figure 3 This is a model example of the energy pile single pile temperature field heat distribution prediction system. Figure 4 , 5 It is a model example of the heat distribution prediction system of the temperature field of energy pile groups under different working conditions.

Claims

1. An energy pile visual heat prediction system, characterized by: Step 1: Determine the size and length of the pile according to the construction engineering drawing information, and establish a three-dimensional energy pile-soil model; Step 2: After the model is established, the initial stress field is generated, the pile is buried, the temperature field is applied, and the pile top load is loaded; Step 3: Process the on-site pile position coordinates according to the three-dimensional energy pile group model, set the pile number, enter the pile number engineering information and upload it to the system, and establish a database for each pile for management.

2. The energy pile visual heat prediction system according to claim 1 is characterized in that: Before step 1, the following steps are also included: Carry out initial ground temperature test at the construction site and record the soil thermal conductivity. Carry out ground temperature test again after the energy pile is working and record the new soil thermal conductivity to determine the thermal conductivity parameters of the energy pile model.

3. The energy pile visual heat prediction system according to claim 2 is characterized in that: In step 2, the soil part in the pile-soil model is simulated using the Mohr-Coulomb model.

4. The energy pile visual heat prediction system according to claim 3 is characterized in that: In step 2, the main body of the pipe pile is constructed using a homogeneous isotropic elastic model.

5. The energy pile visualized heat prediction system according to claim 4 is characterized in that: In step 2, the pile model is constructed using a cylindrical shell mesh.

6. The energy pile visualized heat prediction system according to claim 5, characterized in that: In step 2, the soil surrounding the pipe piles is set using a gradient radial grid around the cylindrical tunnel.

7. The energy pile visualized heat prediction system according to claim 6, characterized in that: In step 2, the temperature field is applied in FLAC3D through the heat conduction mode, and various heat conduction parameters are set.

8. The energy pile visualized heat prediction system according to claim 7, characterized in that: In step 2, the heat conduction parameters include specific heat capacity, thermal conductivity, and thermal expansion coefficient.

9. A method for quickly confirming the maintenance pile position based on the energy pile visual heat prediction system according to any one of claims 1 to 8, characterized in that: A temperature control network for the water supply network of energy pile groups is established, and temperature sensors are installed at the water inlet pipes on the tops of the energy piles and at the water inlet tanks. Based on the real-time data from the temperature sensors of the energy pile water inlet tanks and the water supply network, the energy pile positions are quickly positioned and the visual heat prediction system is corrected.

10. The method for quickly confirming the position of a maintenance pile according to claim 9, characterized in that: The specific steps are: A temperature control network for the water supply network of energy pile groups is established, and temperature sensors are installed at the water inlet pipes on the tops of the energy piles and at the water inlet tanks. The energy pile heat prediction system is corrected based on the real-time surface temperature and the real-time data of the temperature sensors of the energy pile water inlet tanks and water supply network. The heat diffusion of the energy piles is visualized, the working status of the energy pile system is monitored, and the engineering information and historical data results of pile numbers with abnormal status are obtained. The real-time data is compared with the heat prediction system to locate the pile position, pile number and engineering report of the abnormal energy piles to solve safety problems.

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