A calculation method and system for the pull-out bearing capacity of a spiral anchor pile anchor plate

Abstract

The present invention provides a method for calculating the pull-out bearing capacity of an anchor plate of a spiral anchor pile, comprising: calculating the force received by each anchor plate in a spiral anchor pile inserted into the soil in turn according to a pull-out range, and calculating the pull-out bearing capacity borne by the anchor plate of the spiral anchor pile based on the force received by all the anchor plates within the pull-out range, wherein the pull-out range is determined by the soil density on the upper surface of the anchor plate during the pull-out process; the calculation method for the pull-out bearing capacity of the anchor plate is the key to the design of the spiral anchor pile foundation, and the present invention calculates the pull-out bearing capacity of the anchor plate of the spiral anchor pile based on test data and phenomena, and can manufacture the corresponding spiral anchor plate by calculating the pull-out bearing capacity in the working state, so as to optimize the subsequent spiral anchor plate.

Description

Technical Field

[0001] The invention relates to a spiral anchor pile, and in particular to a calculation method and system for the pull-out bearing capacity of an anchor plate of a spiral anchor pile. Background Art

[0002] The spiral anchor pile is a basic structural part shaped like a "screw", which is simple to construct and beneficial to environmental protection. It is generally made of steel and is welded or integrally cast by anchor rods, anchor plates, etc. It is an anchoring structure that utilizes the resistance of deep soil. There is no need to excavate the foundation pit during construction. By applying torque to the top of the anchor rod, the spiral anchor pile is screwed into the deeper soil, which has little disturbance to the soil, can give full play to the inherent strength of the original soil, and improve the bearing capacity. The foundation type mainly composed of spiral anchor piles has the advantages of simple manufacturing, convenient installation and construction, fast drilling speed, and fast bearing capacity. It can shorten the construction period, reduce the project cost, have little damage to the environment, high bearing capacity, and small deformation. Its application is one of the effective ways to reduce the amount of earthwork and concrete in the construction of foundation projects and reduce soil erosion. The spiral anchor pile is suitable for foundation projects such as transmission towers and photovoltaic solar panel brackets. At present, there are various types of spiral anchor pile anchor plates, but the design of spiral anchor pile anchor plates does not really consider the optimization of spiral anchor pile anchor plates. Summary of the invention

[0003] In view of the fact that the existing spiral anchor pile anchor plate is not optimized, the present invention provides a method for calculating the pull-out bearing capacity of the spiral anchor pile anchor plate, and the calculation method comprises the following steps:

[0004] The force on each anchor plate of the spiral anchor pile inserted into the soil is calculated in turn according to the pull-up range;

[0005] Calculating the pull-out bearing capacity of the spiral anchor pile anchor plate based on the forces borne by all anchor plates within the pull-out range;

[0006] The pulling-up range is determined by the soil density on the upper surface of the anchor plate during the pulling-up process.

[0007] Preferably, the pull-up range includes:

[0008] When the soil density on the upper surface of the anchor plate is the natural density during the pulling process, the displacement of the anchor plate is within the first range;

[0009] When the soil density on the upper surface of the anchor plate is in a saturated state during the pulling process, the displacement of the anchor plate is in the third range;

[0010] When the soil density on the upper surface of the anchor plate during the pulling-up process is between the natural density and the saturated state, the displacement of the anchor plate is in the second range.

[0011] Preferably, the method of calculating the force exerted on each anchor plate in the spiral anchor pile inserted into the soil in turn according to the pull-up range includes:

[0012] When the top of the anchor rod is continuously pulled up, the displacement of each anchor plate is within each pulling-up range, and the gravity of the unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate are measured respectively;

[0013] Based on the gravity of the measured unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate, the force received by each anchor plate in each current pulling range is calculated using a calculation formula within the pulling range.

[0014] Preferably, the calculation of the pull-out bearing capacity of the spiral anchor pile anchor plate based on the forces received by all anchor plates within the pull-out range includes:

[0015] The number of anchor plates on the spiral anchor pile and the pull-out range of the displacement distance of each anchor plate are determined, and the forces exerted on each anchor plate in each range are added together to obtain the pull-out bearing capacity of the anchor plate of the spiral anchor pile.

[0016] Preferably, the pull-out bearing capacity of the anchor plate of the spiral anchor pile is obtained by determining the number of anchor plates on the spiral anchor pile and the pull-out range of the displacement distance of each anchor plate, and adding the forces received by each anchor plate in each range, as shown in the following formula:

[0017] T P =∑(T 1i +T 2i +T 3i )

[0018] Where, T P T is the pull-out bearing capacity of the spiral anchor pile anchor plate; 1i is the bearing capacity of the i-th anchor plate in the first range; T 2i is the increment of the bearing capacity of the i-th anchor plate in the second range; T 3i is the friction force on the i-th anchor plate in the third range.

[0019] Preferably, the force exerted on each anchor plate in each current pulling-up range is calculated using a calculation formula within the pulling-up range based on the gravity exerted on the measured unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate, including:

[0020] When the displacement of the anchor plate is within the first range, the bearing capacity of the anchor plate is calculated using the first calculation formula;

[0021] When the displacement of the anchor plate is within the second range, the increment of the bearing capacity of the anchor plate is calculated using the second calculation formula;

[0022] When the displacement of the anchor plate is within the third range, the friction force is calculated using the third calculation formula.

[0023] Preferably, the first calculation formula is as follows:

[0024]

[0025] Where, T1 is the bearing capacity of the anchor plate in the first range; γ s is the gravity of the soil per unit volume; is the buried depth of the anchor plate; B 2 is the anchor plate diameter; Q P is the weight of the anchor plate.

[0026] Preferably, the second calculation formula is as follows:

[0027]

[0028] Wherein, T2 is the increment of the anchor bearing capacity of the anchor plate in the second range; h is the burial depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate; λ c c is the influence coefficient of soil shear height; u is the shear strength of the soil above the anchor plate.

[0029] Preferably, the third calculation formula is as follows:

[0030]

[0031] Wherein, T3 is the friction force on the anchor plate in the third range; λ c is the soil shear height influence coefficient; h is the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate; γ is the gravity of the unit volume of soil; λ f K is the influence coefficient of soil friction height; u is the horizontal side pressure coefficient; f φ is the soil sliding friction coefficient.

[0032] Preferably, including:

[0033] Acquisition module: for each anchor plate in the spiral anchor pile inserted into the soil, the force exerted on each anchor plate is calculated in turn according to the pull-up range;

[0034] The measuring module calculates the pull-out bearing capacity of the spiral anchor pile anchor plate based on the forces received by all anchor plates within the pull-out range.

[0035] Preferably, the acquisition module includes: a distance measurement submodule and an interval submodule;

[0036] The measuring submodule: when the top of the anchor rod is continuously pulled up, the displacement of each anchor plate is within each pulling-up range, and the gravity of the unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate are measured respectively;

[0037] The interval submodule: based on the gravity of the measured unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate, the calculation formula within the pull-out range is used to calculate the force received by each anchor plate in the current pull-out range.

[0038] Preferably, the measurement module includes: a judgment submodule and a calculation submodule;

[0039] The judgment submodule is used to judge the pulling-up range of the displacement distance of the anchor plate when the top of the anchor rod is pulled up;

[0040] The calculation submodule calculates the force exerted on the anchor plate based on the pull-up range of the displacement distance using a calculation formula corresponding to the pull-up range.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. The present invention provides a method for calculating the pull-out bearing capacity of a spiral anchor pile anchor plate, comprising: calculating the force received by each anchor plate in a spiral anchor pile inserted into the soil in turn according to a pull-out range, and calculating the pull-out bearing capacity borne by the spiral anchor pile anchor plate based on the force received by all anchor plates within the pull-out range, wherein the pull-out range is determined by the soil density on the upper surface of the anchor plate during the pull-out process. The present invention measures the force received by the spiral anchor pile anchor plate during operation, calculates the bearing capacity of the spiral anchor pile anchor plate within different displacement ranges, and can better control the pull-out bearing capacity during operation.

[0043] 2. By analyzing the stress conditions of the spiral anchor pile and anchor plate in the soil, and calculating the stress magnitude according to the stress conditions, the pull-out bearing capacity of the spiral anchor pile and anchor plate in the soil can be finally obtained. Through the optimal pull-out resistance, miniaturized parts and spiral anchor pile and anchor plate can be manufactured to reduce the amount of stone, concrete and land loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a flow chart of the method for calculating the pull-out bearing capacity of the anchor plate of the spiral anchor pile of the present invention;

[0045] Figure 2 It is a schematic diagram of the structure of the calculation system of the pull-out bearing capacity of the spiral anchor pile anchor plate of the present invention;

[0046] Figure 3 It is a structural schematic diagram of the anchor plate of the present invention when it is stationary in the soil and subjected to stress;

[0047] Figure 4 It is a schematic diagram of the pull-out bearing capacity of the soil body above the anchor plate of the present invention when the soil body is partially sheared and damaged;

[0048] Figure 5It is a schematic diagram of the calculation model of the pull-out bearing capacity of the soil above the anchor plate according to the sliding friction of the present invention. DETAILED DESCRIPTION

[0049] The embodiments of the present invention are further described in conjunction with the accompanying drawings.

[0050] Embodiment 1:

[0051] The present invention provides a method for calculating the pull-out bearing capacity of a spiral anchor pile anchor plate. Figure 1 and Figure 3 The stress state structure of the anchor plate before loading is introduced, including:

[0052] Step 1: Calculate the force on each anchor plate of the spiral anchor pile inserted into the soil according to the pull-up range;

[0053] Step 2: Calculate the pull-out bearing capacity of the spiral anchor pile anchor plate based on the forces received by all anchor plates within the pull-out range;

[0054] The pulling-up range is determined by the soil density on the upper surface of the anchor plate during the pulling-up process.

[0055] Step 1: Calculate the force on each anchor plate of the spiral anchor pile inserted into the soil according to the pull-up range, and combine Figure 4 and Figure 5 Specifically include:

[0056] (i) When the top of the anchor rod is continuously pulled up, the displacement of each anchor plate is within each pulling-up range, and the gravity of the unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate are measured respectively;

[0057] (ii) Based on the gravity of the measured unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate, the force exerted on each anchor plate in each current pull-out range is calculated using a calculation formula within the pull-out range.

[0058] The pull-up range includes:

[0059] When the soil density on the upper surface of the anchor plate is the natural density during the pulling process, the displacement of the anchor plate is within the first range;

[0060] When the soil density on the upper surface of the anchor plate is in a saturated state during the pulling process, the displacement of the anchor plate is in the third range;

[0061] When the soil density on the upper surface of the anchor plate during the pulling-up process is between the natural density and the saturated state, the displacement of the anchor plate is in the second range.

[0062] Step 2: Calculating the pull-out bearing capacity of the spiral anchor pile anchor plate based on the forces received by all anchor plates within the pull-out range, specifically including: Calculating the pull-out bearing capacity of the spiral anchor pile anchor plate based on the forces received by all anchor plates within the pull-out range, including:

[0063] The number of anchor plates on the spiral anchor pile and the pull-out range of the displacement distance of each anchor plate are determined, and the forces exerted on each anchor plate in each range are added together to obtain the pull-out bearing capacity of the anchor plate of the spiral anchor pile.

[0064] The number of anchor plates on the spiral anchor pile and the pull-out range of the displacement distance of each anchor plate are determined, and the forces exerted on each anchor plate in each range are added together to obtain the pull-out bearing capacity of the anchor plate of the spiral anchor pile, as shown in the following formula:

[0065] T P =∑(T 1i +T 2i +T 3i )

[0066] Where, T P T is the pull-out bearing capacity of the spiral anchor pile anchor plate; 1i is the bearing capacity of the i-th anchor plate in the first range; T 2i is the increment of the bearing capacity of the i-th anchor plate in the second range; T 3i is the friction force on the i-th anchor plate in the third range.

[0067] Based on the gravity of the measured unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate, the force received by each anchor plate in each current pull-up range is calculated using a calculation formula within the pull-up range, including:

[0068] When the displacement of the anchor plate is within the first range, the bearing capacity of the anchor plate is calculated using the first calculation formula;

[0069] When the displacement of the anchor plate is within the second range, the increment of the bearing capacity of the anchor plate is calculated using the second calculation formula;

[0070] When the displacement of the anchor plate is within the third range, the friction force is calculated using the third calculation formula.

[0071] Take an anchor plate as an example. After the top of the screw anchor pile is pulled up, the surface soil pressure under the anchor plate is gradually released as the displacement of the anchor plate increases. u1 When the anchor plate is smaller than 2mm to 5mm (usually less than 2mm to 5mm), the bearing capacity of the anchor plate is composed of the soil pressure on the upper surface of the anchor plate and the weight of the anchor plate, and the pull-out displacement of the anchor plate exceeds S u1 When T1 continues to increase, it remains unchanged and is calculated as follows:

[0072]

[0073] Among them, H is the buried depth of the anchor plate, B 2 is the anchor plate diameter, Q P is the weight of the anchor plate, and T1 is the pull-out bearing capacity formed by the dissipation of the supporting pressure of the soil under the anchor plate.

[0074] After the top of the anchor rod is pulled up and the displacement of the anchor plate continues to increase, the pressure between the upper surface of the anchor plate and the soil above it increases, and the soil is compressed, causing local shear failure of the upper soil, and the failure surface is columnar (see Figure 2 , a cylinder formed by the edge of the anchor plate at a certain height in the upward pulling direction), the pull-out bearing capacity of the anchor plate is formed due to the shear resistance of the local soil.

[0075] The displacement of the anchor plate reaches S u2 (generally 5mm to 10mm) when the soil is sheared within a certain range close to the upper part of the anchor plate, the soil produces a pull-out effect. As the displacement continues to increase, the shear section (height λ c B) Continue to move upward, when the displacement of the anchor plate reaches S u2 After that, the shared pull-out bearing capacity T2 remains basically unchanged. The calculation method of the pull-out bearing capacity increment caused by local shear failure is:

[0076]

[0077] Wherein, h is the buried depth of the anchor plate when there is no other anchor plate in the soil above the anchor plate, or the distance between this anchor plate and the upper anchor plate when there is an anchor plate above it, and c is u is the shear strength of the soil above the anchor plate, λ c It is the influence coefficient of soil shear height, which is generally between 0 and 3.0, and has different values ​​for different types of soil.

[0078] After the top of the anchor rod is pulled up and the displacement of the anchor plate continues to increase, the pressure of the anchor plate on the soil above it continues to increase, causing the soil above to be compressed and sheared. As the shear section gradually extends toward the ground or the previous anchor plate, the columnar soil within a certain range above the anchor plate slips with the surrounding contact soil (see Figure 3 ), and generate friction resistance, thereby increasing the pull-out bearing capacity of the anchor plate. The calculation method for the incremental bearing capacity of this part is:

[0079]

[0080] Wherein, h is the buried depth of the anchor plate when there is no other anchor plate in the soil above the anchor plate, or the distance between this anchor plate and the upper anchor plate when there is an anchor plate above; λ f K is the coefficient of influence of soil friction height, and its value is affected by factors such as soil type and anchor plate displacement. When the anchor plate displacement is 50 mm, the value is generally 1.0-4.0;u is the horizontal side pressure coefficient, generally ranging from 0.5 to 2.0. It is the sliding friction coefficient of soil, generally ranging from 0.2 to 0.7.

[0081] The bearing capacity of the anchor plate is composed of T1, T2, and T3. The bearing capacity of the anchor plate is:

[0082] T p =T1+T2+T3

[0083] Where, T P is the pull-out bearing capacity of the spiral anchor pile anchor plate, T1 is the anchor plate bearing capacity within the first range, T2 is the increment of the anchor plate bearing capacity within the second range, and T3 is the friction force within the third range.

[0084] Embodiment 2:

[0085] Taking three anchor plates as an example, one spiral anchor pile contains three anchor plates, the diameter of each anchor plate is 0.5m, and the buried depths of the anchor plates from bottom to top are 6.0m, 4.5m, and 3.0m respectively.

[0086] After the top of the spiral anchor pile is pulled up to bear the load, when the displacement of the anchor plate is less than 2mm to 5mm, the surface soil pressure under the anchor plate is gradually released. At this time, the bearing capacity of the anchor plate is composed of the surface soil pressure on the anchor plate and the weight shared by the anchor plate. The calculation method is:

[0087]

[0088] Among them, H is the buried depth of the anchor plate, B 2 is the anchor plate diameter, Q P is the weight of the anchor plate, and T1 is the pull-out bearing capacity formed by the dissipation of the supporting pressure of the soil under the anchor plate.

[0089] After the top of the anchor rod is pulled up and the displacement of the anchor plate continues to increase, when the displacement is less than 5mm to 10mm, the pressure of the anchor plate on the upper soil continues to increase, causing local shear failure of the upper soil. The failure surface is columnar. The calculation method for the increase in the pull-out bearing capacity caused by the shear failure of the local soil is:

[0090]

[0091] Where h is the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate, λ c It is the influence coefficient of soil shear height, which is generally 0-3.0 and has different values ​​for different types of soil.

[0092] After the top of the anchor rod is pulled up and the displacement of the anchor plate continues to increase, the pressure of the anchor plate on the soil above it continues to increase, causing shear failure of the upper soil and gradually extending to the ground or the previous anchor plate. The columnar soil within a certain range above the anchor plate slips with the surrounding contact soil and generates friction resistance, thereby increasing the pull-out bearing capacity of the anchor plate. The bearing capacity increment calculation method is:

[0093]

[0094] Wherein, h is the buried depth of the anchor plate when there is no other anchor plate in the soil above the anchor plate, or the distance between this anchor plate and the upper anchor plate when there is an anchor plate above; λ f K is the coefficient of influence of soil friction height, and its value is affected by factors such as soil type and anchor plate displacement. When the anchor plate displacement is 50 mm, the value is generally 1.0-4.0; u is the horizontal side pressure coefficient, generally ranging from 0.5 to 2.0. It is the sliding friction coefficient of soil, generally ranging from 0.2 to 0.7.

[0095] The bearing capacity of the anchor plate is composed of T1, T2, and T3. The bearing capacity of the anchor plate is:

[0096] T P =∑(T 1i +T 2i +T 3i )

[0097] Where, T P T is the pull-out bearing capacity of the spiral anchor pile anchor plate; 1i is the bearing capacity of the i-th anchor plate in the first range; T 2i is the increment of the bearing capacity of the i-th anchor plate in the second range; T 3i is the friction force on the i-th anchor plate in the third range.

[0098] First, calculate the pull-out bearing capacity of each anchor plate as T pi , including the soil weight of the i-th anchor plate T 1i 、T 2i 、T 3i Among them, the soil weight is 18kN / m 3 When the anchor plate is displaced by 50 mm, its shear and friction coefficients are 1.0 and 2.5 respectively, the horizontal side pressure coefficient is 1.5, the soil friction coefficient is 0.5, and other parameters are taken according to the physical and mechanical properties of the soil;

[0099] Bring in

[0100]

[0101]

[0102] Then, the shared pull-out bearing capacities of the anchor plates from bottom to top were obtained to be 183 kN, 138 kN, and 93 kN respectively.

[0103] By T P =∑(T 1i +T 2i +T 3i );

[0104] The calculated pull-out bearing capacity of the spiral anchor pile is 414kN.

[0105] Embodiment 3:

[0106] Based on the same inventive concept, combined Figure 2 The present invention also provides a calculation system for the pull-out bearing capacity of a spiral anchor pile anchor plate, comprising:

[0107] Acquisition module: for each anchor plate in the spiral anchor pile inserted into the soil, the force exerted on the anchor plate is calculated in turn according to the pull-up range;

[0108] The acquisition module includes: a distance measurement submodule and an interval submodule;

[0109] The measuring submodule: when the top of the anchor rod is continuously pulled up, the displacement of each anchor plate is within each pulling-up range, and the gravity of the unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate are measured respectively;

[0110] The interval submodule: based on the gravity of the measured unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate, the calculation formula within the pull-out range is used to calculate the force received by each anchor plate in the current pull-out range.

[0111] The measuring module calculates the pull-out bearing capacity of the spiral anchor pile anchor plate based on the forces received by all anchor plates within the pull-out range.

[0112] The measurement module includes: a judgment submodule and a calculation submodule;

[0113] The judgment submodule is used to judge the pulling-up range of the displacement distance of the anchor plate when the top of the anchor rod is pulled up;

[0114] The calculation submodule calculates the force exerted on the anchor plate based on the pull-up range of the displacement distance using a calculation formula corresponding to the pull-up range.

[0115] The measurement module calculates the pull-out bearing capacity of the spiral anchor pile anchor plate based on the forces borne by all anchor plates within the pull-out range, including:

[0116] When the anchor plate displacement is within the set first range, the first calculation formula is used

[0117]

[0118] Where, T1 is the bearing capacity of the anchor plate in the first range; γ s is the gravity of the soil per unit volume; is the buried depth of the anchor plate; B 2 is the anchor plate diameter; Q P is the weight of the anchor plate.

[0119] When the anchor plate displacement is within the set second range, the second calculation formula is used

[0120]

[0121] Wherein, T2 is the increment of the anchor bearing capacity of the anchor plate in the second range; h is the burial depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate; λ c c is the influence coefficient of soil shear height; u is the shear strength of the soil above the anchor plate.

[0122] When the anchor plate displacement is within the set third range, the third calculation formula is used

[0123] Where, T3 is the friction force on the anchor plate in the third range, λ c is the soil shear height influence coefficient, h is the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate; γ is the gravity per unit volume of soil; λ f K is the influence coefficient of soil friction height; u is the horizontal side pressure coefficient; f φ is the soil sliding friction coefficient.

[0124] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0125] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0126] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0127] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0128] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A method for calculating the pull-out bearing capacity of a spiral anchor pile anchor plate, characterized in that: The method comprises: The force on each anchor plate of the spiral anchor pile inserted into the soil is calculated in turn according to the pull-up range; Calculating the pull-out bearing capacity of the spiral anchor pile anchor plate based on the forces borne by all anchor plates within the pull-out range; Wherein, the pulling range is determined by the soil density on the upper surface of the anchor plate during the pulling process; The pull-up range includes: When the soil density on the upper surface of the anchor plate is the natural density during the pulling process, the displacement of the anchor plate is within the first range; When the soil density on the upper surface of the anchor plate is saturated during the pulling process, the displacement of the anchor plate is in the third range; When the soil density on the upper surface of the anchor plate is between the natural density and the saturated state during the pulling process, the displacement of the anchor plate is in the second range; The method of calculating the force exerted on each anchor plate of the spiral anchor pile inserted into the soil according to the pull-up range in turn includes: When the top of the anchor rod is continuously pulled up, the displacement of each anchor plate is within each pulling-up range, and the gravity of the unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate are measured respectively; Based on the gravity of the measured unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate, the force exerted on each anchor plate in each current pulling range is calculated using a calculation formula within the pulling range; The force received by each anchor plate in each current pulling range is calculated using a calculation formula within the pulling range based on the gravity received by the measured unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate, including: When the displacement of the anchor plate is within the first range, the bearing capacity of the anchor plate is calculated using the first calculation formula; When the displacement of the anchor plate is within the second range, the increment of the bearing capacity of the anchor plate is calculated using the second calculation formula; When the displacement of the anchor plate is within a third range, the friction force is calculated using a third calculation formula; The first calculation formula is as follows: Where, T1 is the bearing capacity of the anchor plate in the first range; γ s is the gravity per unit volume of soil; H is the buried depth of the anchor plate; B is the diameter of the anchor plate; B 2 is the square of the anchor plate diameter; Q P is the weight of the anchor plate; The second calculation formula is as follows: Wherein, T2 is the increment of the anchor bearing capacity of the anchor plate in the second range; h is the burial depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate; λ c c is the influence coefficient of soil shear height; u is the shear strength of the soil above the anchor plate; The third calculation formula is as follows: Wherein, T3 is the friction force on the anchor plate in the third range; λ c is the influence coefficient of soil shear height; H is the buried depth of the anchor plate; h is the distance between the lower anchor plate and the upper anchor plate; γ is the gravity per unit volume of soil; λ f K is the influence coefficient of soil friction height; u is the horizontal side pressure coefficient; f φ is the soil sliding friction coefficient.

2. The calculation method according to claim 1, characterized in that: The calculation of the pull-out bearing capacity of the spiral anchor pile anchor plate based on the forces received by all anchor plates within the pull-out range includes: The number of anchor plates on the spiral anchor pile and the pull-out range of the displacement distance of each anchor plate are determined, and the forces exerted on each anchor plate in each range are added together to obtain the pull-out bearing capacity of the anchor plate of the spiral anchor pile.

3. The calculation method according to claim 2, characterized in that: The pull-out range of the number of anchor plates on the spiral anchor pile and the displacement distance of each anchor plate is determined, and the forces on each anchor plate in each range are added to obtain the pull-out bearing capacity of the anchor plate of the spiral anchor pile, as shown in the following formula: T P =∑(T 1i +T 2i +T 3i ) Where, T P T is the pull-out bearing capacity of the spiral anchor pile anchor plate; 1i is the bearing capacity of the i-th anchor plate in the first range; T 2i is the increment of the bearing capacity of the i-th anchor plate in the second range; T 3i is the friction force on the i-th anchor plate in the third range.

4. A calculation system for the pull-out bearing capacity of a spiral anchor pile anchor plate, characterized in that: include: Acquisition module: for each anchor plate in the spiral anchor pile inserted into the soil, the force exerted on each anchor plate is calculated in turn according to the pull-up range; A measuring module, for calculating the pull-out bearing capacity of the spiral anchor pile anchor plate based on the forces borne by all anchor plates within the pull-out range; The pull-up range includes: When the soil density on the upper surface of the anchor plate is the natural density during the pulling process, the displacement of the anchor plate is within the first range; When the soil density on the upper surface of the anchor plate is saturated during the pulling process, the displacement of the anchor plate is in the third range; When the soil density on the upper surface of the anchor plate is between the natural density and the saturated state during the pulling process, the displacement of the anchor plate is in the second range; The acquisition module includes: a distance measurement submodule and an interval submodule; The distance measuring submodule: when the top of the anchor rod is continuously pulled up, the displacement of each anchor plate is within each pulling-up range, and the gravity of the unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate are measured respectively; The interval submodule: based on the gravity of the measured unit volume of soil and the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate, the calculation formula within the pull-up range is used to calculate the force received by each anchor plate in the current pull-up range; The interval submodule is specifically used for: When the displacement of the anchor plate is within the first range, the bearing capacity of the anchor plate is calculated using the first calculation formula; When the displacement of the anchor plate is within the second range, the increment of the bearing capacity of the anchor plate is calculated using the second calculation formula; When the displacement of the anchor plate is within a third range, the friction force is calculated using a third calculation formula; The first calculation formula is as follows: Where, T1 is the bearing capacity of the anchor plate in the first range; γ s is the gravity per unit volume of soil; H is the buried depth of the anchor plate; B is the diameter of the anchor plate; B 2 is the square of the anchor plate diameter; Q P is the weight of the anchor plate; The second calculation formula is as follows: Wherein, T2 is the increment of the anchor bearing capacity of the anchor plate in the second range; h is the burial depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate; λ c c is the influence coefficient of soil shear height; u is the shear strength of the soil above the anchor plate; The third calculation formula is as follows: Wherein, T3 is the friction force on the anchor plate in the third range; λ c is the soil shear height influence coefficient; h is the buried depth of the anchor plate or the distance between the lower anchor plate and the upper anchor plate; γ is the gravity of the unit volume of soil; λ f K is the influence coefficient of soil friction height; u is the horizontal side pressure coefficient; f φ is the soil sliding friction coefficient.

5. The computing system of claim 4, wherein: The measurement module includes: a judgment submodule and a calculation submodule; The judgment submodule is used to judge the pulling-up range of the displacement distance of the anchor plate when the top of the anchor rod is pulled up; The calculation submodule is used to calculate the force exerted on the anchor plate based on the pull-up range of the displacement distance by using a calculation formula corresponding to the pull-up range.

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