Method and device for determining frost heaving prevention result of concrete pipe pile

Abstract

The embodiment of the invention provides a method and device for determining a frost heaving prevention result of a concrete pipe pile. The method comprises the steps that the lowest environment temperature of an area where the concrete pipe pile is located and the temperature of accumulated water in an accumulated water containing cavity are obtained; according to the temperature of the accumulated water, the allowed total heat transfer amount of the accumulated water is determined; according to the lowest environment temperature, the temperature difference between the accumulated water freezing point temperature and the lowest environment temperature is determined; according to the temperature difference and the thicknesses of the first plugging plate, the air interlayer and the second plugging plate, the heat transfer speed of the concrete pipe pile is determined; according to the accumulated water allowable total heat transfer amount and the heat transfer speed, the time needed by freezing is determined; and comparing the time required for freezing with set time to obtain a frost heaving prevention result. According to the embodiment of the invention, the first plugging plate, the second plugging plate and the air interlayer are arranged, an efficient heat insulation layer is formed by utilizing the extremely low heat conductivity coefficient of air, heat conduction of external low temperature to the accumulated water containing cavity is remarkably reduced, and accumulated water is prevented from being frozen.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of photovoltaic supports, and in particular to a method and device for determining the anti-freeze expansion results of concrete pipe piles. Background Art

[0002] Photovoltaic rack pile foundations often utilize single-row PHC (prestressed high-strength) concrete pipe piles. These concrete pipe piles are cylindrical and hollow. In the frigid northern regions, where winter nighttime temperatures can plummet below -20°C, concrete pipe piles pose a serious risk of frost heave, particularly in areas with shallow groundwater. At -20°C, the expansion pressure from freezing can reach 200 MPa, exceeding the standard tensile strength of concrete pipe piles (3.11 MPa). This can cause radial cracks in the concrete piles, and in severe cases, even fracture. This poses a significant threat to the stability and safety of the photovoltaic power station foundation, increasing the cost and difficulty of subsequent maintenance. Summary of the Invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a method and device for determining the anti-frost expansion results of concrete pipe piles. By setting the first sealing plate, the second sealing plate and the air interlayer, the extremely low thermal conductivity of air is utilized to form a high-efficiency thermal insulation layer, thereby significantly reducing the heat conduction from the external low temperature to the water accumulation cavity and preventing the accumulated water from freezing.

[0004] To solve the above technical problems, the technical solutions of the embodiments of the present invention are as follows: A method for determining the anti-frost heave results of a concrete pipe pile, the concrete pipe pile comprising: a concrete pipe pile vertically arranged in the soil, the concrete pipe pile being hollow; a first blocking plate and a second blocking plate horizontally arranged in the underground portion of the concrete pipe pile; wherein the second blocking plate is arranged below the first blocking plate, the second blocking plate and the first blocking plate separate the hollow cavity of the concrete pipe pile to form an air interlayer, the second blocking plate being a set distance away from the bottom of the concrete pipe pile, the second blocking plate separating the hollow cavity of the concrete pipe pile to form a water storage cavity; the method comprising: Obtaining the lowest ambient temperature of the area where the concrete pipe pile is located and the temperature of the accumulated water in the accumulated water holding chamber; determining an allowable total heat transfer of the accumulated water according to the temperature of the accumulated water; Determining the temperature difference between the freezing point of the accumulated water and the lowest ambient temperature according to the lowest ambient temperature; determining a heat transfer rate of the concrete pipe pile according to the temperature difference and the thicknesses of the first sealing plate, the air interlayer, and the second sealing plate; Determine the time required for freezing based on the total allowable heat transfer and heat transfer rate of the accumulated water; The time required for freezing is compared with the set time to obtain the anti-freeze heave result.

[0005] Optionally, determining the allowable total heat transfer amount of the accumulated water according to the temperature of the accumulated water includes: according to , determining the allowable temperature difference between the temperature of the accumulated water and the freezing point of the accumulated water; in, △T allow To allow temperature differences, T 1 is the temperature of the accumulated water, T 2 is the freezing point temperature of accumulated water; according to , determine the sensible heat released by the accumulated water; in, Q 1 is the sensible heat released by the accumulated water, m is the weight of accumulated water, c is the specific heat capacity of the accumulated water; according to , determining the amount of heat released by the latent heat of the accumulated water; in, Q 2 is the heat released by the latent heat of water. L f is the latent heat of freezing of accumulated water; according to , determine the total allowable heat transfer capacity of the accumulated water; in, Q Total heat transfer allowed for accumulated water.

[0006] Optionally, determining the temperature difference between the freezing point of the accumulated water and the lowest ambient temperature according to the lowest ambient temperature includes: according to , determining the temperature difference between the freezing point temperature of the accumulated water and the lowest ambient temperature; in, △T is the temperature difference, T 3 is the lowest ambient temperature.

[0007] Optionally, determining the heat transfer rate of the concrete pipe pile according to the temperature difference and the thicknesses of the first blocking plate, the air interlayer, and the second blocking plate includes: according to , determine the thermal resistance of the first blocking plate; in, R 1 is the thermal resistance of the first blocking plate, D 1 is the thickness of the first blocking plate, l 1 is the thermal conductivity of the first blocking plate; according to , determine the thermal resistance of the air interlayer; in, R 2 is the thermal resistance of the air interlayer,D 2 is the thickness of the air layer, l 2 is the thermal conductivity of the air interlayer; according to , determine the thermal resistance of the second blocking plate; in, R 3 is the thermal resistance of the second blocking plate, D 3 is the thickness of the second blocking plate, l 3 is the thermal conductivity of the second blocking plate; according to , determine the thermal resistance of concrete pipe piles; in, R is the thermal resistance of the concrete pipe pile; according to , determine the heat transfer rate of concrete pipe piles; in, v is the heat transfer rate of concrete piles, A is the cross-sectional area of ​​the hollow cavity in the concrete pipe pile.

[0008] Optionally, determining the time required for freezing based on the total allowable heat transfer amount and heat transfer rate of the accumulated water includes: according to , determine the time required for freezing; in, t The time required for freezing, v is the heat transfer rate of concrete pipe pile.

[0009] Optionally, comparing the freezing time with a set time to obtain an anti-freeze heave result includes: like , then the anti-freeze expansion result of the concrete pipe pile is to achieve the purpose of anti-freeze expansion; in, t 1 is the set time.

[0010] Optionally, the determination method further includes: Determine the shear design value and shear bearing capacity limit of the second blocking plate; If the shear force design value is greater than or equal to the shear force bearing capacity limit, it is determined that the second blocking plate meets the bearing capacity requirement.

[0011] Optionally, determining a shear force design value of the second blocking plate includes: according to , determine the shear force design value of the second blocking plate; in, V is the shear design value of the second blocking plate, a is the excess pore water pressure amplification effect coefficient, c is the bulk density of the accumulated water, his the distance from the groundwater level to the second plugging plate, d is the inner diameter of the concrete pile; Determine the shear bearing capacity limit of the second blocking plate, including: according to , determine the shear bearing capacity limit of the second blocking plate; in, V 1 is the shear bearing capacity limit of the second blocking plate, b is the empirical coefficient, β is the influence coefficient of shear section height, f is the design value of the axial tensile strength of concrete, A 0 is the shear cross-sectional area of ​​the second blocking plate.

[0012] An embodiment of the present invention further provides a device for determining the anti-frost heave result of a concrete pipe pile, the concrete pipe pile comprising: a concrete pipe pile vertically arranged in the soil, the concrete pipe pile being hollow; a first blocking plate and a second blocking plate horizontally arranged in the underground portion of the concrete pipe pile; wherein the second blocking plate is arranged below the first blocking plate, the second blocking plate and the first blocking plate separate the hollow cavity of the concrete pipe pile to form an air interlayer, the second blocking plate being a set distance away from the bottom of the concrete pipe pile, the second blocking plate separating the hollow cavity of the concrete pipe pile to form a water storage cavity, the device comprising: An acquisition module, configured to acquire the lowest ambient temperature of the area where the concrete pipe pile is located and the temperature of the accumulated water in the accumulated water receiving chamber; A determination module is used to determine the total allowable heat transfer of the accumulated water based on the temperature of the accumulated water; determine the temperature difference between the freezing point temperature of the accumulated water and the minimum ambient temperature based on the minimum ambient temperature; determine the heat transfer rate of the concrete pipe pile based on the temperature difference and the thickness of the first sealing plate, the air interlayer and the second sealing plate; determine the time required for freezing based on the total allowable heat transfer and the heat transfer rate of the accumulated water; compare the time required for freezing with the set time to obtain an anti-freeze heave result.

[0013] An embodiment of the present invention also provides a computing device, comprising: one or more processors; a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the method described above.

[0014] The above solution of the embodiment of the present invention has at least the following beneficial effects: The above-mentioned scheme of the embodiment of the present invention, by setting the first sealing plate, the second sealing plate and the air interlayer, utilizes the extremely low thermal conductivity of air to form a high-efficiency insulation layer, significantly reduces the heat conduction from the external low temperature to the water accumulation cavity, prevents the accumulated water from freezing, and avoids the damage to the pile body caused by the expansion force generated by frost heave.

[0015] The first blocking plate and the second blocking plate are connected in an embedded manner, which improves the stability of the concrete pipe pile and avoids failure of the heat insulation or anti-seepage function due to structural looseness.

[0016] The combined structure of the first sealing plate, the second sealing plate and the air interlayer can provide a long-term and stable thermal insulation and anti-seepage effect, ensure the safety and durability of the photovoltaic bracket foundation, and reduce subsequent maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a concrete pipe pile provided by an embodiment of the present invention.

[0018] Figure 2 The present invention provides a flowchart of a method for determining the anti-frost expansion results of concrete pipe piles.

[0019] Figure 3 It is a structural schematic diagram of a device for determining the anti-frost expansion result of a concrete pipe pile provided by an embodiment of the present invention.

[0020] Description of reference numerals: 1. Concrete pipe pile, 2. Soil, 3. First sealing plate, 4. Air interlayer, 5. Second sealing plate, 6. Water storage chamber. DETAILED DESCRIPTION

[0021] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0022] like Figure 1 As shown, an embodiment of the present invention provides a concrete pipe pile, comprising: A concrete pipe pile 1 is vertically arranged in the soil 2, wherein the concrete pipe pile 1 is hollow; A first blocking plate 3 and a second blocking plate 5 are horizontally arranged at the underground portion of the concrete pipe pile 1; Among them, the second sealing plate 5 is arranged below the first sealing plate 3, and the second sealing plate 5 and the first sealing plate 3 separate the hollow cavity of the concrete pipe pile 1 to form an air interlayer 4. The second sealing plate 5 is at a set distance from the bottom of the concrete pipe pile 1, and the second sealing plate 5 separates the hollow cavity of the concrete pipe pile 1 to form a water storage chamber 6.

[0023] Specifically, the first and second sealing plates 3 and 5 are made of high-strength impermeable concrete (C40 impermeable concrete). They are embedded with a double-layer Φ8@150mm steel mesh, have an impermeability grade of P8, and a bearing capacity of ≥1.2 MPa. They are embedded in the concrete pipe pile 1.

[0024] The thickness of the first blocking plate 3 is between 80mm and 100mm, the thickness of the air interlayer 4 is between 400mm and 500mm, the thickness of the second blocking plate 5 is between 80mm and 150mm, and the thickness of the water storage chamber 6 is between 200mm and 500mm.

[0025] In this embodiment, by setting the first sealing plate 3, the second sealing plate 5 and the air interlayer 4, the extremely low thermal conductivity of air is utilized to form a high-efficiency insulation layer, which significantly reduces the heat conduction from the external low temperature to the water storage chamber 6, prevents the accumulated water from freezing, and avoids the damage to the pile body caused by the expansion force generated by frost heave.

[0026] The first blocking plate 3 and the second blocking plate 5 are connected in an embedded manner, which improves the stability of the concrete pipe pile 1 and avoids failure of the heat insulation or anti-seepage function due to structural looseness.

[0027] The combined structure of the first sealing plate 3, the second sealing plate 5 and the air interlayer 4 can provide a long-term and stable heat insulation and anti-seepage effect, ensure the safety and durability of the photovoltaic support foundation, and reduce subsequent maintenance costs.

[0028] like Figure 2 As shown, an embodiment of the present invention further provides a method for determining the anti-frost heave result of a concrete pipe pile, which is applied to the concrete pipe pile as described above, comprising: Step 11, obtaining the lowest ambient temperature of the area where the concrete pipe pile 1 is located and the temperature of the accumulated water in the accumulated water accommodating chamber 6; Step 12, determining the total allowable heat transfer capacity of the accumulated water according to the temperature of the accumulated water; Step 13, determining the temperature difference between the freezing point of the accumulated water and the lowest ambient temperature according to the lowest ambient temperature; Step 14, determining the heat transfer rate of the concrete pipe pile 1 according to the temperature difference and the thicknesses of the first blocking plate 3, the air interlayer 4, and the second blocking plate 5; Step 15, determining the time required for freezing based on the total allowable heat transfer amount and heat transfer rate of the accumulated water; Step 16: Compare the freezing time with the set time to obtain an anti-freeze heave result.

[0029] In this embodiment, by obtaining the minimum ambient temperature and accumulated water temperature, and combining parameters such as temperature difference and heat transfer rate to calculate the time required for freezing, the anti-freeze heave effect is transformed from a qualitative judgment to a quantitative analysis, and the anti-freeze ability of the pipe piles in a specific environment can be evaluated.

[0030] By comparing the time required for freezing with the set time, it can be determined whether the concrete pipe pile 1 meets the antifreeze requirements, providing a quantitative basis for adjusting and optimizing the structural parameters of the concrete pipe pile 1, which helps to avoid material waste and cost increase while ensuring the antifreeze effect.

[0031] The frost heave risk that the concrete pipe pile 1 may face in winter can be predicted in advance. If the time required for freezing is less than the set time, improvement measures can be taken in time to reduce the probability of cracking and breaking of the pile body from the design source, ensure the stability and safety of the photovoltaic power station foundation, and reduce the subsequent maintenance cost and difficulty of repair.

[0032] In an optional embodiment of the present invention, in step 12, determining the total allowable heat transfer capacity of the accumulated water according to the temperature of the accumulated water includes: Step 121, according to , determining the allowable temperature difference between the temperature of the accumulated water and the freezing point of the accumulated water; in, △T allow To allow temperature difference, T 1 is the temperature of the accumulated water, T 2 is the freezing point temperature of accumulated water; Step 122, according to , determine the sensible heat released by the accumulated water; in, Q 1 is the sensible heat released by the accumulated water, m is the weight of accumulated water, c is the specific heat capacity of the accumulated water; Step 123, according to , determining the amount of heat released by the latent heat of the accumulated water; in, Q 2 is the heat released by the latent heat of the accumulated water. L f is the latent heat of freezing of accumulated water; Step 124, according to , determine the total allowable heat transfer capacity of the accumulated water; in, Q Total heat transfer allowed for accumulated water.

[0033] In this embodiment, by determining the allowable temperature difference between the accumulated water temperature and the freezing point, the temperature range within which the accumulated water can be lowered without freezing is clarified, thereby setting a safety threshold for subsequent heat transfer.

[0034] Combining the calculation of sensible heat and latent heat, the heat released by the accumulated water during the process of cooling from its current temperature to the freezing point (sensible heat) and the latent heat released during freezing are fully considered, ensuring that the evaluation of the total heat transfer covers the entire phase change process.

[0035] In an optional embodiment of the present invention, in step 13, determining the temperature difference between the freezing point of the accumulated water and the lowest ambient temperature according to the lowest ambient temperature includes: Step 131, according to , determining the temperature difference between the freezing point temperature of the accumulated water and the lowest ambient temperature; in, △T is the temperature difference, T 3 is the lowest ambient temperature.

[0036] In step 14, the heat transfer rate of the concrete pipe pile 1 is determined according to the temperature difference and the thicknesses of the first blocking plate 3, the air interlayer 4, and the second blocking plate 5, including: Step 141, according to , determine the thermal resistance of the first blocking plate 3; in, R 1 is the thermal resistance of the first blocking plate 3, D 1 is the thickness of the first blocking plate 3, l 1 is the thermal conductivity of the first blocking plate 3; Step 142, according to , determine the thermal resistance of the air interlayer 4; in, R 2 is the thermal resistance of the air interlayer 4, D 2 is the thickness of the air interlayer 4, l 2 is the thermal conductivity of the air interlayer 4; Step 143, according to , determine the thermal resistance of the second blocking plate 5; in, R 3 is the thermal resistance of the second blocking plate 5, D 3 is the thickness of the second blocking plate 5, l 3 is the thermal conductivity of the second blocking plate 5; Step 144, according to , determine the thermal resistance of concrete pipe pile 1; in, R is the thermal resistance of the concrete pipe pile 1; Step 145, according to , determine the heat transfer rate of the concrete pipe pile 1; in, v is the heat transfer rate of concrete pile 1, A is the cross-sectional area of ​​the hollow cavity of the concrete pipe pile 1.

[0037] In this embodiment, step 13 clarifies the power source of heat transfer by calculating the temperature difference between the lowest ambient temperature and the freezing point of the accumulated water, which can accurately reflect the degree of influence of the low temperature environment in the northern cold region on the accumulated water inside the concrete pipe pile 1, and provides temperature boundary conditions for subsequent heat transfer calculations.

[0038] In step 14, the thermal resistance of the internal antifreeze structure of the concrete pipe pile 1 (the first blocking plate 3, the air interlayer 4, and the second blocking plate 5) is calculated separately and then summed. This reflects the difference in thermal conductivity of different materials (the thermal conductivity of air is much lower than that of concrete) and takes into account the thickness parameters of each structural layer. The calculation of the total thermal resistance is tailored to the actual structure of the first blocking plate 3-air interlayer 4-second blocking plate 5, ensuring a more accurate assessment of the heat transfer barrier capacity.

[0039] Calculating the heat transfer rate in combination with the temperature difference, total thermal resistance, and heat transfer area can quantitatively reflect the amount of heat passing through the antifreeze structure of the concrete pipe pile 1 per unit time, providing a basis for determining whether the antifreeze structure can prevent accumulated water from freezing during periods of extreme low temperatures in winter, thereby avoiding the limitations of traditional empirical evaluation.

[0040] In an optional embodiment of the present invention, in step 15, determining the time required for freezing based on the total allowable heat transfer amount and heat transfer rate of the accumulated water includes: Step 151, according to , determine the time required for freezing; in, t The time required for freezing, v is the heat transfer rate of concrete pipe pile 1.

[0041] In step 15, determining the time required for freezing based on the total allowable heat transfer and heat transfer rate of the accumulated water may further include: Step 152, correcting the time required for freezing; specifically, this may include: according to , determine the corrected freezing time; in, t xz is the corrected freezing time, i is the air layer convection influence coefficient, n is the influence coefficient of thermal resistance change after ice layer formation.

[0042] In this embodiment, the freezing time is calculated based on the ratio of the total heat transfer amount to the heat transfer rate, and the possibility of water accumulation and freezing inside the concrete pipe pile 1 is converted into a specific duration. This can intuitively determine whether the accumulated water will freeze during the period of extreme low temperatures in winter in the northern cold regions, providing a clear time dimension reference for the anti-freeze cracking effect.

[0043] Taking into account the influence of air layer convection and the change of thermal resistance after ice layer formation on heat transfer, the freezing time is adjusted by introducing a correction coefficient to make the calculation results more in line with actual working conditions.

[0044] In an optional embodiment of the present invention, in step 16, comparing the freezing time with the set time to obtain the frost heave prevention result includes: Step 161, if , then the anti-freeze expansion result of the concrete pipe pile 1 is to achieve the purpose of anti-freeze expansion; in, t 1 is the set time.

[0045] In this embodiment, the judgment basis is that the time required for freezing is ≥ the set time, which provides a clear and operational standard for the evaluation of the anti-freeze heave effect, avoids the ambiguity of subjective judgment, and can directly reflect the actual anti-freeze ability of the pipe piles in the northern cold regions.

[0046] The set time can be determined in combination with the duration of the local extreme low temperature in winter. When the time required for freezing exceeds this time, the accumulated water will not freeze during the entire winter low temperature period. From the time dimension, it is ensured that the pipe piles will not crack or break due to frost heave, thereby ensuring the stability of the photovoltaic bracket foundation.

[0047] If the purpose of preventing frost heave is not achieved, the internal structural parameters of the concrete pipe pile 1 can be adjusted in a targeted manner according to the comparison results.

[0048] In an optional embodiment of the present invention, in step 17, the determination method further includes: Step 171, determine the shear force design value of the second blocking plate 5; specifically, , determine the shear force design value of the second blocking plate 5; in, V is the shear force design value of the second blocking plate 5, a is the excess pore water pressure amplification effect coefficient, c is the bulk density of the accumulated water, h is the distance from the groundwater level to the second blocking plate 5, d is the inner diameter of the concrete pipe pile 1; Step 172, determine the shear bearing capacity limit of the second blocking plate 5; specifically, , determine the shear bearing capacity limit of the second blocking plate 5; in, V 1 is the shear bearing capacity limit of the second blocking plate 5, b is the empirical coefficient, β is the influence coefficient of shear section height, f is the design value of the axial tensile strength of concrete, A 0 is the shear cross-sectional area of ​​the second blocking plate 5; Step 173: If the shear force design value is greater than or equal to the shear force bearing capacity limit, it is determined that the second blocking plate 5 meets the bearing capacity requirement; specifically, if , then the second blocking plate 5 meets the bearing capacity requirements.

[0049] In this embodiment, the shear force design value is calculated by introducing the excess pore water pressure amplification effect coefficient, which fully considers the additional load on the second sealing plate 5 caused by soil disturbance during the piling process. The bearing capacity limit is determined by combining parameters such as the empirical coefficient to ensure that the second sealing plate 5 can withstand the shear force under actual working conditions, avoid groundwater from entering the air interlayer 4 due to damage to the anti-seepage plate, and maintain the integrity of the anti-freeze structure.

[0050] By accurately calculating the force based on the distance from the groundwater level to the second sealing plate 5 and the inner diameter of the pipe pile, the shear force calculation is more in line with the geological conditions of the photovoltaic power station in the northern cold region, ensuring the stability of the second sealing plate 5 under the action of groundwater pressure.

[0051] The second sealing plate 5 is an important component of the first sealing plate 3-air interlayer 4-second sealing plate 5 structure. The verification of its shear bearing capacity provides a structural basis for the overall antifreeze effect, avoiding chain problems such as water infiltration and reduced thermal insulation function caused by the failure of the second sealing plate 5.

[0052] Example 1 In a certain area, the minimum ambient temperature is -35°C, and the accumulated water temperature (normal groundwater temperature) is 10°C. For concrete pipe piles 1 in this area, Example 1 provides a method for determining the frost heave protection results of the concrete pipe piles, including: Step 21, determining the total allowable heat transfer of the accumulated water according to the temperature of the accumulated water; specifically, △T allow =10℃, m =10.1kg, c =4200J / (kg·K), L f =334kJ / kg, but Q 1=10.1×4200×10=424,200J, Q 2=10.1×334×103=3,373,400J, Q= 424,200+3,373,400=3,797,600J; Step 22, based on the minimum ambient temperature, determine the temperature difference between the freezing point of the accumulated water and the minimum ambient temperature; specifically, △T =0℃-(-35℃)=35℃; Step 23, determining the heat transfer rate of the concrete pipe pile 1 according to the temperature difference and the thickness of the first blocking plate 3, the air interlayer 4 and the second blocking plate 5; specifically, R 1=0.1 / 1.74=0.0575m2·K / W, R 2=0.5 / 0.023=21.7391m2·K / W, R 3=0.1 / 1.74=0.0575m2·K / W, then R=R 1 +R 2 +R 3=21.8541m2·K / W; v =35×0.0201 / 21.8541=0.032J / s; Step 24, determining the time required for freezing based on the total heat transfer amount and heat transfer rate allowed by the accumulated water; specifically, t =3,797,600 / 0.032=1.187×108 seconds=1374 days (about 3.76 years); Considering the influence of air layer convection and the change of thermal resistance after ice layer formation, t xz =1374×0.66×0.85=771 days (about 2.11 years); Step 25, compare the time required for freezing with the set time to obtain the anti-freeze heave result; specifically, the set time is the duration of winter in the area, t xz The concrete pipe pile 1 will not freeze during the whole winter, thus achieving the purpose of preventing freezing and swelling.

[0053] In Example 1, for an area with a minimum ambient temperature of -35°C and a water accumulation temperature of 10°C, the corrected freezing time calculated using this method is approximately 2.11 years, which is longer than the local winter duration. This verifies that the concrete pipe pile 1 can prevent water accumulation and freezing throughout the winter, achieving the purpose of preventing frost heave, and fully demonstrates the effectiveness and practicality of this technical solution.

[0054] The present invention forms a high-efficiency thermal insulation layer by utilizing the combined structure of the first sealing plate 3, the second sealing plate 5 and the air interlayer 4, and utilizes the extremely low thermal conductivity of air to significantly reduce the heat conduction from the external low temperature to the water storage chamber 6, which can effectively prevent the accumulated water from freezing, and avoid the huge expansion force generated by the volume expansion of water after freezing to damage the pile body, thereby solving the frost heave problem of concrete pipe piles 1 in the northern cold regions from the root.

[0055] The first sealing plate 3 and the second sealing plate 5 are made of C40 anti-seepage concrete and are embedded in the concrete pipe pile 1, which improves the stability of the overall structure, avoids the failure of insulation or anti-seepage function due to structural looseness, and ensures long-term stable function in extreme environments.

[0056] By obtaining parameters such as the minimum ambient temperature and accumulated water temperature, and combining the temperature difference and heat transfer rate to calculate the time required for freezing, the anti-frost heave effect is transformed from a qualitative judgment to a quantitative analysis. This can accurately evaluate the anti-freeze ability of pipe piles in specific environments, avoiding the subjectivity of traditional experience judgment.

[0057] When determining the total allowable heat transfer of accumulated water, both sensible heat release and latent heat release are taken into account, covering the complete phase change process of accumulated water from cooling to freezing; when calculating the heat transfer rate, the thermal resistance of each structural layer is calculated separately to reflect the differences in thermal conductivity of different materials, making the results more realistic.

[0058] The influence coefficient of air layer convection and the influence coefficient of thermal resistance change after ice layer formation are introduced to correct the freezing time, making the calculation results more consistent with actual working conditions and improving the accuracy of anti-frost heave assessment.

[0059] By comparing the time required for freezing with the set time, it can be determined whether the pipe piles meet the anti-freeze requirements, providing a quantitative basis for adjusting the structural parameters. The risk of frost heave can be predicted in advance and timely improvements can be made. The probability of cracking and breaking of the pile body can be reduced from the design source, ensuring the stability and safety of the photovoltaic power station foundation, and reducing the subsequent maintenance costs and difficulty of repairs.

[0060] like Figure 3 As shown, an embodiment of the present invention further provides a device 30 for determining the anti-frost heave result of a concrete pipe pile, wherein the concrete pipe pile comprises: a concrete pipe pile 1 vertically arranged in the soil 2, wherein the concrete pipe pile 1 is hollow; a first blocking plate 3 and a second blocking plate 5 horizontally arranged in the underground part of the concrete pipe pile 1; wherein the second blocking plate 5 is arranged below the first blocking plate 3, and the second blocking plate 5 and the first blocking plate 3 separate the hollow cavity of the concrete pipe pile 1 to form an air interlayer 4, and the second blocking plate 5 is at a set distance from the bottom of the concrete pipe pile 1, and the second blocking plate 5 separates the hollow cavity of the concrete pipe pile 1 to form a water storage chamber 6, and the device comprises: An acquisition module 31 is used to acquire the minimum ambient temperature of the area where the concrete pipe pile 1 is located and the temperature of the accumulated water in the accumulated water accommodating chamber 6; The determination module 32 is used to determine the total allowable heat transfer of the accumulated water according to the temperature of the accumulated water; determine the temperature difference between the freezing point temperature of the accumulated water and the minimum ambient temperature according to the minimum ambient temperature; determine the heat transfer rate of the concrete pipe pile 1 according to the temperature difference and the thickness of the first sealing plate 3, the air interlayer 4 and the second sealing plate 5; determine the time required for freezing according to the total allowable heat transfer and heat transfer rate of the accumulated water; compare the time required for freezing with the set time to obtain the anti-freeze heave result.

[0061] Optionally, determining the allowable total heat transfer amount of the accumulated water according to the temperature of the accumulated water includes: according to , determining the allowable temperature difference between the temperature of the accumulated water and the freezing point of the accumulated water; in, △T allow To allow temperature differences, T 1 is the temperature of the accumulated water, T 2 is the freezing point temperature of accumulated water; according to , determine the sensible heat released by the accumulated water; in, Q 1 is the sensible heat released by the accumulated water, m is the weight of accumulated water, c is the specific heat capacity of the accumulated water; according to , determining the amount of heat released by the latent heat of the accumulated water; in, Q 2 is the heat released by the latent heat of water. L f is the latent heat of freezing of accumulated water; according to , determine the total allowable heat transfer capacity of the accumulated water; in, Q Total heat transfer allowed for accumulated water.

[0062] Optionally, determining the temperature difference between the freezing point of the accumulated water and the lowest ambient temperature according to the lowest ambient temperature includes: according to , determining the temperature difference between the freezing point temperature of the accumulated water and the lowest ambient temperature; in, △T is the temperature difference, T 3 is the lowest ambient temperature.

[0063] Optionally, determining the heat transfer rate of the concrete pipe pile 1 according to the temperature difference and the thicknesses of the first blocking plate 3, the air interlayer 4, and the second blocking plate 5 includes: according to , determine the thermal resistance of the first blocking plate 3; in, R1 is the thermal resistance of the first blocking plate 3, D 1 is the thickness of the first blocking plate 3, l 1 is the thermal conductivity of the first blocking plate 3; according to , determine the thermal resistance of the air interlayer 4; in, R 2 is the thermal resistance of the air interlayer 4, D 2 is the thickness of the air interlayer 4, l 2 is the thermal conductivity of the air interlayer 4; according to , determine the thermal resistance of the second blocking plate 5; in, R 3 is the thermal resistance of the second blocking plate 5, D 3 is the thickness of the second blocking plate 5, l 3 is the thermal conductivity of the second blocking plate 5; according to , determine the thermal resistance of concrete pipe pile 1; in, R is the thermal resistance of the concrete pipe pile 1; according to , determine the heat transfer rate of the concrete pipe pile 1; in, v is the heat transfer rate of concrete pile 1, A is the cross-sectional area of ​​the hollow cavity of the concrete pipe pile 1.

[0064] Optionally, determining the time required for freezing based on the total allowable heat transfer amount and heat transfer rate of the accumulated water includes: according to , determine the time required for freezing; in, t The time required for freezing, v is the heat transfer rate of concrete pipe pile 1.

[0065] Optionally, comparing the freezing time with a set time to obtain an anti-freeze heave result includes: like , then the anti-freeze expansion result of the concrete pipe pile 1 is to achieve the purpose of anti-freeze expansion; in, t 1 is the set time.

[0066] Optionally, the determining module 32 is further configured to: Determine the shear force design value and shear force bearing capacity limit of the second blocking plate 5; If the shear force design value is greater than or equal to the shear force bearing capacity limit, it is determined that the second blocking plate 5 meets the bearing capacity requirement.

[0067] Optionally, determining the shear force design value of the second blocking plate 5 includes: according to , determine the shear force design value of the second blocking plate 5; in, V is the shear force design value of the second blocking plate 5, a is the excess pore water pressure amplification effect coefficient, c is the bulk density of the accumulated water, h is the distance from the groundwater level to the second blocking plate 5, d is the inner diameter of the concrete pipe pile 1; Determining the shear bearing capacity limit of the second blocking plate 5 includes: according to , determine the shear bearing capacity limit of the second blocking plate 5; in, V 1 is the shear bearing capacity limit of the second blocking plate 5, b is the empirical coefficient, β is the influence coefficient of shear section height, f is the design value of the axial tensile strength of concrete, A 0 is the shear cross-sectional area of ​​the second blocking plate 5.

[0068] It should be noted that this device is a device corresponding to the above method, and all implementation methods in the above method embodiment are applicable to this embodiment and can achieve the same technical effect.

[0069] An embodiment of the present invention further provides a computing device, comprising: one or more processors; The storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the method as described above.

[0070] An embodiment of the present invention further provides a computing device readable storage medium storing instructions that, when executed on a computing device, cause the computing device to execute the method described above. All implementations in the above method embodiments are applicable to this embodiment and can achieve the same technical effects.

[0071] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the present invention can be implemented in electronic hardware, or a combination of computing device software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0072] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0073] In the embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0074] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0075] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0076] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a storage medium readable by a computing device. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computing device software product is stored in a storage medium and includes a number of instructions for enabling a computing device (which can be a personal computing device, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, ROM, RAM, a magnetic disk, or an optical disk.

[0077] In addition, it should be pointed out that in the apparatus and method of the present invention, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present invention. Moreover, the steps of performing the above-mentioned series of processing can naturally be performed in chronological order according to the order of description, but they do not necessarily need to be performed in chronological order, and some steps can be performed in parallel or independently of each other. For those of ordinary skill in the art, it can be understood that all or any steps or components of the method and apparatus of the present invention can be implemented in hardware, firmware, software or a combination thereof in any computing device (including a processor, storage medium, etc.) or a network of computing devices. This can be achieved by those of ordinary skill in the art using basic programming skills after reading the description of the present invention.

[0078] Therefore, the purpose of the present invention can also be achieved by running a program or a group of programs on any computing device. The computing device can be a well-known general-purpose device. Therefore, the purpose of the present invention can also be achieved simply by providing a program product containing program code that implements the method or device. That is to say, such a program product also constitutes the present invention, and the storage medium storing such a program product also constitutes the present invention. Obviously, the storage medium can be any well-known storage medium or any storage medium developed in the future. It should also be pointed out that in the device and method of the present invention, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. In addition, the steps of performing the above-mentioned series of processing can naturally be performed in chronological order according to the order of description, but do not necessarily need to be performed in chronological order. Certain steps can be performed in parallel or independently of each other.

[0079] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for determining the anti-frost expansion results of concrete pipe piles, characterized in that: A concrete pipe pile comprises: a concrete pipe pile (1) vertically arranged in soil (2), wherein the concrete pipe pile (1) is hollow; a first blocking plate (3) and a second blocking plate (5) horizontally arranged in the underground portion of the concrete pipe pile (1); wherein the second blocking plate (5) is arranged below the first blocking plate (3), and the second blocking plate (5) and the first blocking plate (3) separate the hollow cavity of the concrete pipe pile (1) to form an air interlayer (4); the second blocking plate (5) is at a set distance from the bottom of the concrete pipe pile (1), and the second blocking plate (5) separates the hollow cavity of the concrete pipe pile (1) to form a water storage cavity (6); the method comprises: Obtaining the lowest ambient temperature of the area where the concrete pipe pile (1) is located and the temperature of the accumulated water in the accumulated water holding chamber (6); determining an allowable total heat transfer of the accumulated water according to the temperature of the accumulated water; Determining the temperature difference between the freezing point of the accumulated water and the lowest ambient temperature according to the lowest ambient temperature; Determining the heat transfer rate of the concrete pipe pile (1) according to the temperature difference and the thicknesses of the first blocking plate (3), the air interlayer (4) and the second blocking plate (5); Determine the time required for freezing based on the total allowable heat transfer and heat transfer rate of the accumulated water; The time required for freezing is compared with the set time to obtain the anti-freeze heave result.

2. The method for determining the anti-frost expansion result of a concrete pipe pile according to claim 1, characterized in that: Determining the total allowable heat transfer amount of the accumulated water according to the temperature of the accumulated water includes: according to , determining the allowable temperature difference between the temperature of the accumulated water and the freezing point of the accumulated water; in, △T allow To allow temperature difference, T 1 is the temperature of the accumulated water, T 2 is the freezing point temperature of accumulated water; according to , determine the sensible heat released by the accumulated water; in, Q 1 is the sensible heat released by the accumulated water, m is the weight of accumulated water, c is the specific heat capacity of the accumulated water; according to , determining the amount of heat released by the latent heat of the accumulated water; in, Q 2 is the heat released by the latent heat of water. L f is the latent heat of freezing of accumulated water; according to , determine the total allowable heat transfer capacity of the accumulated water; in, Q The total heat transfer allowed for accumulated water.

3. The method for determining the anti-frost expansion result of a concrete pipe pile according to claim 1, characterized in that: Determining the temperature difference between the freezing point of the accumulated water and the lowest ambient temperature according to the lowest ambient temperature includes: according to , determining the temperature difference between the freezing point temperature of the accumulated water and the lowest ambient temperature; in, △T is the temperature difference, T 3 is the lowest ambient temperature.

4. The method for determining the anti-frost expansion result of a concrete pipe pile according to claim 3, characterized in that: Determining the heat transfer rate of the concrete pipe pile (1) based on the temperature difference and the thicknesses of the first blocking plate (3), the air interlayer (4), and the second blocking plate (5) comprises: according to , determining the thermal resistance of the first blocking plate (3); in, R 1 is the thermal resistance of the first blocking plate (3), D 1 is the thickness of the first blocking plate (3), λ 1 is the thermal conductivity of the first blocking plate (3); according to , determine the thermal resistance of the air interlayer (4); in, R 2 is the thermal resistance of the air interlayer (4), D 2 is the thickness of the air interlayer (4), λ 2 is the thermal conductivity of the air interlayer (4); according to , determining the thermal resistance of the second blocking plate (5); in, R 3 is the thermal resistance of the second blocking plate (5), D 3 is the thickness of the second blocking plate (5), λ 3 is the thermal conductivity of the second blocking plate (5); according to , determine the thermal resistance of the concrete pipe pile (1); in, R is the thermal resistance of the concrete pipe pile (1); according to , determine the heat transfer rate of the concrete pipe pile (1); in, v is the heat transfer rate of the concrete pile (1), A is the cross-sectional area of ​​the hollow cavity of the concrete pipe pile (1).

5. The method for determining the anti-frost expansion result of a concrete pipe pile according to claim 4, characterized in that: Determine the time required for freezing based on the total allowable heat transfer and heat transfer rate of the accumulated water, including: according to , determine the time required for freezing; in, t The time required for freezing, v is the heat transfer rate of the concrete pipe pile (1).

6. The method for determining the anti-frost expansion result of a concrete pipe pile according to claim 5, characterized in that: Comparing the freezing time with the set time to obtain the anti-freeze heave result includes: like , then the anti-freeze expansion result of the concrete pipe pile (1) is to achieve the purpose of anti-freeze expansion; in, t 1 is the set time.

7. The method for determining the anti-frost expansion result of a concrete pipe pile according to claim 1, characterized in that: Also includes: Determining the shear design value and shear bearing capacity limit of the second blocking plate (5); If the shear force design value is greater than or equal to the shear force bearing capacity limit, it is determined that the second blocking plate (5) meets the bearing capacity requirement.

8. The method for determining the anti-frost expansion result of a concrete pipe pile according to claim 7, characterized in that: Determine the shear design value of the second blocking plate (5), including: according to , determine the shear force design value of the second blocking plate (5); in, V is the shear design value of the second blocking plate (5), a is the excess pore water pressure amplification effect coefficient, γ is the bulk density of the accumulated water, h is the distance from the groundwater level to the second plugging plate (5), d is the inner diameter of the concrete pipe pile (1); Determine the shear bearing capacity limit of the second blocking plate (5), including: according to , determine the shear bearing capacity limit of the second blocking plate (5); in, V 1 is the shear bearing capacity limit of the second blocking plate (5), b is the empirical coefficient, β is the influence coefficient of shear section height, f is the design value of the axial tensile strength of concrete, A 0 is the shear cross-sectional area of ​​the second blocking plate (5).

9. A device for determining the anti-freeze expansion result of a concrete pipe pile, characterized in that: A concrete pipe pile comprises: a concrete pipe pile (1) vertically arranged in soil (2), wherein the concrete pipe pile (1) is hollow; a first blocking plate (3) and a second blocking plate (5) horizontally arranged in the underground portion of the concrete pipe pile (1); wherein the second blocking plate (5) is arranged below the first blocking plate (3), and the second blocking plate (5) and the first blocking plate (3) separate the hollow cavity of the concrete pipe pile (1) to form an air interlayer (4); the second blocking plate (5) is at a set distance from the bottom of the concrete pipe pile (1), and the second blocking plate (5) separates the hollow cavity of the concrete pipe pile (1) to form a water storage cavity (6); and the device comprises: An acquisition module, used for acquiring the lowest ambient temperature of the area where the concrete pipe pile (1) is located and the temperature of the accumulated water in the accumulated water receiving chamber (6); A determination module is used to determine the total allowable heat transfer of the accumulated water according to the temperature of the accumulated water; determine the temperature difference between the freezing point temperature of the accumulated water and the minimum ambient temperature according to the minimum ambient temperature; determine the heat transfer rate of the concrete pipe pile (1) according to the temperature difference and the thickness of the first blocking plate (3), the air interlayer (4) and the second blocking plate (5); determine the time required for freezing according to the total allowable heat transfer of the accumulated water and the heat transfer rate; compare the time required for freezing with the set time to obtain an anti-freeze heave result.

10. A computing device comprising: one or more processors; The storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the method as described above.

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