A method for predicting temporary land occupation area of a tower foundation in a hilly area mechanical construction

Abstract

The present application relates to a kind of hill area mechanized construction tower foundation area temporary area prediction method, belong to power construction method technical field.The technical scheme of the present application is: with the high-low leg tower foundation of single side slope as the research object, the surplus soil produced by each tower leg site leveling before foundation excavation and the earthwork excavated by mechanized construction rotary drilling rig are taken as the main calculation object, the construction channel is all adopted the way of half-excavation and half-filling, earthwork self-balancing is not calculated, other surplus soil is all stacked along the construction channel margin, according to the situation of more strictly executing surplus soil stacking measures, the area prediction is carried out, among them, the surplus soil is stacked along the slope in the case of small terrain slope, the outer slope of tower leg is taken as the blocking measure in the case of larger slope gradient.The beneficial effects of the present application are: combining the characteristics of power transmission and transformation project, for the tower foundation of typical single side slope in hilly area, a more accurate prediction method of single tower foundation disturbance area is realized.

Description

Technical Field

[0001] This invention relates to a method for predicting the temporary land occupation area of ​​tower foundation area in mechanized construction in hilly areas, belonging to the technical field of power construction methods. Background Technology

[0002] During power grid construction, due to the lack of good technical control over the mechanized excavation and backfilling of foundations in hilly areas, and the high requirements for construction access and site leveling in the tower base area, the slope of the hilly area has a significant impact on the excavation area. The results calculated by using the conventional method of expanding the average of a few meters outward on each side of the tower base differ greatly from the actual disturbance area. Often, the predicted area on the slope is too large and the predicted area on the downslope is too small, which is not conducive to on-site construction control. Summary of the Invention

[0003] The purpose of this invention is to provide a method for predicting the temporary land occupation area of ​​tower foundations in mechanized construction in hilly areas. Combining the characteristics of power transmission and transformation projects, this method aims to achieve a relatively accurate prediction of the disturbance area of ​​a single tower foundation for tower foundations on typical single-sided slopes in hilly areas. Excavated soil is piled along the edge of the construction passage, and the area is predicted according to the strict implementation of the soil piling measures. In the case of terrain with a small slope, soil is piled up along the slope, while the outer slope of the tower leg with a larger slope is protected by retaining measures. This effectively solves the above-mentioned problems existing in the background technology.

[0004] The technical solution of the present invention is: a method for predicting the temporary land occupation area of ​​the tower foundation area in mechanized construction in hilly areas, comprising the following steps: taking the high and low leg tower foundations on a single-sided slope as the research object, taking the excess soil generated from the site leveling of each tower leg before foundation excavation and the soil excavated by mechanized rotary drilling rigs as the main calculation objects, the construction passages are all adopted in a semi-excavation and semi-filling manner, the soil self-balancing is not calculated, and the other excavated excess soil is piled along the edge of the construction passage. The area is predicted according to the situation of strictly implementing the excess soil piling measures, wherein the soil is piled along the slope when the terrain slope is small, and the outer slope of the tower leg with a larger slope is protected by the blocking measures.

[0005] 1) If the terrain slope is less than 15°, the excess soil will be piled in a turtle-back shape within the tower base area. The excess soil will be disposed of by storing it nearby, without exceeding the excavation area. A 4m x 4m wide working surface will be excavated at the tower leg location. The formula for calculating the temporary land occupation and disturbance area A2 is as follows:

[0006] A2 = [(L1 + 4) / cosα)] 2 -[(L1+2) / cosα] 2

[0007] Where L1 is the horizontal distance between adjacent tower legs, α is the horizontal angle of the slope, and A2 is the area of ​​temporary land occupation disturbance;

[0008] 2) The terrain slope is 15°-35°, that is, the slope is still within the natural angle of repose. After the excavation of the remaining soil of the tower leg at the downslope position, it is half excavated and half filled in the direction of the downslope position, which exceeds a certain range outside the tower base. A 4m×4m wide working surface is excavated at the tower leg position.

[0009] For terrain with a gentle slope, there are two scenarios: shallow excavation, where the working face width needs to be partially backfilled to reach 4 meters; and deep excavation, where the working face width is greater than 4 meters.

[0010] ① For shallow excavation, the horizontal cross-sectional width of the entire tower foundation disturbance zone

[0011] W=4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d;

[0012] The temporary land occupation disturbance area A2 = (W / cosα) 2 -[(L1+2) / cosα] 2

[0013] ② For deep excavation, the horizontal cross-sectional width of the entire tower base disturbance zone

[0014] W=4tanβ / (cotα+tanβ)+2+L1+cotα×(h-0.5)+2+d;

[0015] The temporary land occupation disturbance area A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 ;

[0016] 3) When the terrain slope is above 35°, select an appropriate location on the downhill slope away from the lower tower leg to set up a retaining wall with a certain volume of excess soil, and pile the excess soil into the retaining wall. The horizontal cross-sectional width of the entire tower foundation disturbance zone is W = 4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d+0.8.

[0017] The temporary land occupation disturbance area A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 .

[0018] When the terrain slope is less than 15°, the edge of the remaining soil and rock pile should be sloped at a ratio of 1:1.5, and the tower leg on the lower side slope should be raised by 0.5-1.0m.

[0019] Let the horizontal distance between adjacent tower legs be L1, then the horizontal cross-sectional width of the entire tower base disturbance zone is W = 2 + L1 + 2;

[0020] Assuming the tower base is square, and assuming the horizontal angle of the slope is α, then the total disturbance area A = (W / cosα). 2The permanent land occupation is defined as 1 meter outward from the center of each tower leg pile foundation. Therefore, the permanent land occupation area is A1 = [(L1+2) / cosα]. 2 Therefore, the temporary land occupation disturbance area A2 = A - A1 can be calculated.

[0021] That is, A2 = [(L1 + 4) / cosα)] 2 -[(L1+2) / cosα] 2 .

[0022] When the terrain slope is 15°-35°, the earthwork volume V1 of the excavation area is equal to the cross-sectional area S1 × the excavation width D1 of the tower leg, and the earthwork volume of each tower leg foundation is v. The earthwork volume V2 of the backfill area is equal to the cross-sectional area S2 of the backfill area × the stacking length D2. The original density of the earthwork in the excavation area is 1.1-1.3 times that of the backfill area. The density before excavation is ρ1, and the density of the backfill area is ρ2.

[0023] The balance formula for earthwork excavation and backfilling is as follows:

[0024] ρ1×(S1×D1+v)=ρ2×S2×D2

[0025] The excavation area at the tower leg location is 4m x 4m wide, therefore D1 = 4m; the backfill stacking length D2 is the distance L1 between the two tower leg foundations, extending 2m outwards on both sides.

[0026] The earthwork balance formula is simplified to: ρ1×(S1×4+v)=ρ2×S2×(L1+4);

[0027] ① For shallow excavation, assuming a 4m square working surface requires a backfill width of d, then

[0028] S1=[(4-d) 2 ×sinα×cosα+(4-d) 2 [×sinα×cot(β-α)] / 2;

[0029] Assuming the natural angle of repose of the slope after backfilling is γ, and the maximum elevation difference of the backfill soil is h, then

[0030] S2=sin(γ-α) / sinα / sinγ×h 2 / 2;

[0031] Based on the earthwork balance formula, the value of h can be derived.

[0032] h={2sinα×sinγ{2[(4-d) 2 ×sinα×cosα+(4-d) 2 ×sinα×cot(β-α)]+v}ρ1 / ρ2 / (L1+4) / sin(γ-α)} 0.5 ;

[0033] Then the distance from the outer edge of the backfill area to the center of the tower leg = cotα × h + 2 - d;

[0034] For the tower leg on the uphill slope, since the slope is not steep, the excavation width of the working face is taken as 4m. Therefore, L2 = 4tanβ / (cotα + tanβ), and the horizontal cross-sectional width of the entire tower foundation disturbance zone is...

[0035] W=4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d;

[0036] Assuming the tower base is square, the total disturbance area is calculated as A = (W / cosα). 2 The permanent land occupation is 1m outward from the center of each tower leg pile foundation, and the permanent land occupation area is A1=[(L1+2) / cosα] 2 The temporary land occupation disturbance area A2 = A - A1 is then calculated.

[0037] That is, A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 .

[0038] ② For deep excavation, assuming the outer width of the 4m square working surface is d, then

[0039] S1=[(4+d) 2 ×sinα×cosα+(4+d) 2 [×sinα×cot(β-α)] / 2;

[0040] Assuming the natural angle of repose of the slope after backfilling is γ, the maximum elevation difference of the backfill soil is h, and the maximum height above the working surface is taken as 0.5m, then

[0041] S2=[2(h-0.5)×cotα-h×cotγ]×h / 2-cotα×(h-0.5) 2 / 2;

[0042] Based on the earthwork balance formula, the value of h can be derived.

[0043] The distance from the outer edge of the backfill area to the center of the tower leg = cotα × (h - 0.5) + 2 + d;

[0044] For the tower leg on the uphill slope, since the slope is not large, the excavation width of the working face is taken as 4m. Therefore, L2=4tanβ / (cotα+tanβ), and the horizontal section width of the entire tower base disturbance zone is W=4tanβ / (cotα+tanβ)+2+L1+cotα×(h-0.5)+2+d;

[0045] Assuming the tower base is square, the total disturbance area is calculated as A = (W / cosα). 2 The permanent land occupation is 1m outward from the center of each tower leg pile foundation, and the permanent land occupation area is A1=[(L1+2) / cosα] 2 The temporary land occupation disturbance area A2 = A - A1 is then calculated.

[0046] That is, A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 .

[0047] When the terrain slope is greater than 35°, the earthwork volume V1 of the excavation area is equal to the cross-sectional area S1 × the excavation width D1 of the tower leg, and the earthwork volume V2 of the backfill area is equal to the cross-sectional area S2 of the backfill area × the retaining wall length D2. The original density of the earthwork in the excavation area is 1.1-1.3 times that of the backfill area. The designed density before excavation is ρ1, and the density of the backfill area is ρ2.

[0048] The working surface at the tower leg location is 4m×4m wide, so D1=4m; the backfill stacking length D2 is usually the distance L1 between the two tower leg foundations plus 2m on both sides.

[0049] The earthwork balance formula is: ρ1×(S1×4+v)=ρ2×S2×(L1+4);

[0050] Assuming a 4m square work surface requires a backfill width of d, then

[0051] S1=[(4-d) 2 ×sinα×cosα+(4-d) 2 [×sinα×cot(β-α)] / 2;

[0052] Assuming the retaining height of the embankment is h, and the thickness of the filter layer is negligible, then S2 = cotα × h 2 / 2; Based on the earthwork balance formula, the value of the barrier height h can be derived.

[0053] h={2ρ1 / ρ2 / (L1+4)×[2(4-d) 2 ×sinα×cosα+2(4-d) 2 ×sinα×cot(β-α)+v]tanα} 0.5 ;

[0054] Then the distance from the outer edge of the backfill area to the center of the tower leg = cotα × h + 2 - d;

[0055] The retaining wall thickness is 800 mm. Therefore, the distance from the outer edge of the retaining wall to the center of the tower leg is calculated as L3+2=cotα×h+2-d+0.8;

[0056] For the tower leg on the uphill side, due to the large slope, the excavation width of the working face is less than 4m. Therefore, L2≤4tanβ / (cotα+tanβ). Taking the maximum value for calculation, the horizontal section width of the entire tower base disturbance zone is W=4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d+0.8;

[0057] Assuming the tower base is square, the total disturbance area is calculated as A = (W / cosα). 2 The permanent land occupation is 1m outward from the center of each tower leg pile foundation, and the permanent land occupation area is A1=[(L1+2) / cosα] 2 The temporary land occupation disturbance area A2 = A - A1 is then calculated.

[0058] That is, A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 .

[0059] The beneficial effects of this invention are: combining the characteristics of power transmission and transformation projects, and targeting tower foundations on typical single-sided slopes in hilly areas, a method for more accurate prediction of the disturbance area of ​​a single tower foundation is realized. Excavated soil is piled along the edge of the construction passage, and the area is predicted according to the situation of strictly implementing the soil piling measures. Among them, soil is piled down the slope when the terrain slope is small, and blocking measures are taken on the outer slope of the tower leg when the slope is large. Attached Figure Description

[0060] Figure 1 This is a schematic diagram of the remaining soil area occupied by shallow excavation at the tower site with a slope of <35° according to the present invention.

[0061] Figure 2 This is a schematic diagram of the remaining soil area occupied by the deep excavation at the tower site of the present invention, where the terrain slope is less than 35°.

[0062] Figure 3 This is a schematic diagram showing the remaining land occupied by the terrain slope of the tower site of the present invention, which is >35°.

[0063] In the diagram: 1. Excavation area; 2. Foundation column; 3. Excavation backfill area; 4. Cross-sectional area of ​​excavation earthwork area; 5. Cross-sectional area of ​​backfill area; 6. Temporary barrier; 7. Permanent barrier. Detailed Implementation

[0064] To make the purpose, technical solutions, and advantages of the invention's embodiments clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only a small part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0065] A method for predicting the temporary land occupation area of ​​the tower foundation area in mechanized construction in hilly areas includes the following steps: taking the high and low leg tower foundations on a single-sided slope as the research object, the surplus soil generated from the site leveling of each tower leg before foundation excavation and the soil excavated by mechanized rotary drilling rigs are the main calculation objects. The construction passages are all constructed using a half-excavation and half-filling method, and the soil self-balancing is not calculated. Other excavated surplus soil is piled up along the edge of the construction passage. The area is predicted according to the case of strictly implementing the surplus soil piling measures. Among them, the soil is piled up along the slope when the terrain slope is small, and the outer slope of the tower leg with a larger slope is protected by the barrier measures.

[0066] 1) If the terrain slope is less than 15°, the excess soil will be piled in a turtle-back shape within the tower base area. The excess soil will be disposed of by storing it nearby, without exceeding the excavation area. A 4m x 4m wide working surface will be excavated at the tower leg location. The formula for calculating the temporary land occupation and disturbance area A2 is as follows:

[0067] A2 = [(L1 + 4) / cosα)] 2 -[(L1+2) / cosα] 2

[0068] Where L1 is the horizontal distance between adjacent tower legs, α is the horizontal angle of the slope, and A2 is the area of ​​temporary land occupation disturbance;

[0069] 2) The terrain slope is 15°-35°, that is, the slope is still within the natural angle of repose. After the excavation of the remaining soil of the tower leg at the downslope position, it is half excavated and half filled in the direction of the downslope position, which exceeds a certain range outside the tower base. A 4m×4m wide working surface is excavated at the tower leg position.

[0070] For terrain with a gentle slope, there are two scenarios: shallow excavation, where the working face width needs to be partially backfilled to reach 4 meters; and deep excavation, where the working face width is greater than 4 meters.

[0071] ① For shallow excavation, the horizontal cross-sectional width of the entire tower foundation disturbance zone

[0072] W=4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d;

[0073] The temporary land occupation disturbance area A2 = (W / cosα) 2 -[(L1+2) / cosα] 2

[0074] ② For deep excavation, the horizontal cross-sectional width of the entire tower base disturbance zone

[0075] W=4tanβ / (cotα+tanβ)+2+L1+cotα×(h-0.5)+2+d;

[0076] The temporary land occupation disturbance area A2 = (W / cosα)2 -[(L1+2) / cosα] 2 ;

[0077] 3) When the terrain slope is above 35°, select an appropriate location on the downhill slope away from the lower tower leg to set up a retaining wall with a certain volume of excess soil, and pile the excess soil into the retaining wall. The horizontal cross-sectional width of the entire tower foundation disturbance zone is W = 4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d+0.8.

[0078] The temporary land occupation disturbance area A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 .

[0079] When the terrain slope is less than 15°, the edge of the remaining soil and rock pile should be sloped at a ratio of 1:1.5, and the tower leg on the lower side slope should be raised by 0.5-1.0m.

[0080] Let the horizontal distance between adjacent tower legs be L1, then the horizontal cross-sectional width of the entire tower base disturbance zone is W = 2 + L1 + 2;

[0081] Assuming the tower base is square, and assuming the horizontal angle of the slope is α, then the total disturbance area A = (W / cosα). 2 The permanent land occupation is defined as 1 meter outward from the center of each tower leg pile foundation. Therefore, the permanent land occupation area is A1 = [(L1+2) / cosα]. 2 Therefore, the temporary land occupation disturbance area A2 = A - A1 can be calculated.

[0082] That is, A2 = [(L1 + 4) / cosα)] 2 -[(L1+2) / cosα] 2 .

[0083] When the terrain slope is 15°-35°, the earthwork volume V1 of the excavation area is equal to the cross-sectional area S1 × the excavation width D1 of the tower leg, and the earthwork volume of each tower leg foundation is v. The earthwork volume V2 of the backfill area is equal to the cross-sectional area S2 of the backfill area × the stacking length D2. The original density of the earthwork in the excavation area is 1.1-1.3 times that of the backfill area. The density before excavation is ρ1, and the density of the backfill area is ρ2.

[0084] The balance formula for earthwork excavation and backfilling is as follows:

[0085] β1×(S1×D1+v)=ρ2×S2×D2

[0086] The excavation area at the tower leg location is 4m x 4m wide, therefore D1 = 4m; the backfill stacking length D2 is the distance L1 between the two tower leg foundations, extending 2m outwards on both sides.

[0087] The earthwork balance formula is simplified to: ρ1×(S1×4+v)=ρ2×S2×(L1+4);

[0088] ① For shallow excavation, assuming a 4m square working surface requires a backfill width of d, then

[0089] S1=[(4-d) 2 ×sinα×cosα+(4-d) 2 [×sinα×cot(β-α)] / 2;

[0090] Assuming the natural angle of repose of the slope after backfilling is γ, and the maximum elevation difference of the backfill soil is h, then

[0091] S2=sin(γ-α) / sinα / sinγ×h 2 / 2;

[0092] Based on the earthwork balance formula, the value of h can be derived.

[0093] h={2sinα×sinγ{2[(4-d) 2 ×sinα×cosα+(4-d) 2 ×sinα×cot(β-α)]+v}ρ1 / ρ2 / (L1+4) / sin(γ-α)} 0.5 ;

[0094] Then the distance from the outer edge of the backfill area to the center of the tower leg = cotα × h + 2 - d;

[0095] For the tower leg on the uphill slope, since the slope is not steep, the excavation width of the working face is taken as 4m. Therefore, L2 = 4tanβ / (cotα + tanβ), and the horizontal cross-sectional width of the entire tower foundation disturbance zone is...

[0096] W=4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d;

[0097] Assuming the tower base is square, the total disturbance area is calculated as A = (W / cosα). 2 The permanent land occupation is 1m outward from the center of each tower leg pile foundation, and the permanent land occupation area is Ax=[(L1+2) / cosα] 2 The temporary land occupation disturbance area A2 = A - A1 is then calculated.

[0098] That is, A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 .

[0099] ② For deep excavation, assuming the outer width of the 4m square working surface is d, then

[0100] S1=[(4+d)2 ×sinα×cosα+(4+d) 2 [×sinα×cot(β-α)] / 2;

[0101] Assuming the natural angle of repose of the slope after backfilling is γ, the maximum elevation difference of the backfill soil is h, and the maximum height above the working surface is taken as 0.5m, then

[0102] S2=[2(h-0.5)×cotα-h×cotγ]×h / 2-cotα×(h-0.5) 2 / 2;

[0103] Based on the earthwork balance formula, the value of h can be derived.

[0104] The distance from the outer edge of the backfill area to the center of the tower leg = cotα × (h - 0.5) + 2 + d;

[0105] For the tower leg on the uphill slope, since the slope is not large, the excavation width of the working face is taken as 4m. Therefore, L2=4tanβ / (cotα+tanβ), and the horizontal section width of the entire tower base disturbance zone is W=4tanβ / (cotα+tanβ)+2+L1+cotα×(h-0.5)+2+d;

[0106] Assuming the tower base is square, the total disturbance area is calculated as A = (W / cosα). 2 The permanent land occupation is 1m outward from the center of each tower leg pile foundation, and the permanent land occupation area is A1=[(L1+2) / cosα] 2 The temporary land occupation disturbance area A2 = A - A1 is then calculated.

[0107] That is, A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 .

[0108] When the terrain slope is greater than 35°, the earthwork volume V1 of the excavation area is equal to the cross-sectional area S1 × the excavation width D1 of the tower leg, and the earthwork volume V2 of the backfill area is equal to the cross-sectional area S2 of the backfill area × the retaining wall length D2. The original density of the earthwork in the excavation area is 1.1-1.3 times that of the backfill area. The designed density before excavation is ρ1, and the density of the backfill area is ρ2.

[0109] The working surface at the tower leg location is 4m×4m wide, so D1=4m; the backfill stacking length D2 is usually 2m on both sides of the distance L1 between the two tower leg foundations.

[0110] The earthwork balance formula is: ρ1×(S1×4+v)=ρ2×S2×(L1+4);

[0111] Assuming a 4m square work surface requires a backfill width of d, then

[0112] S1=[(4-d) 2 ×sinα×cosα+(4-d) 2 [×sinα×cot(β-α)] / 2;

[0113] Assuming the retaining height of the embankment is h, and the thickness of the filter layer is negligible, then S2 = cotα × h 2 / 2; Based on the earthwork balance formula, the value of the barrier height h can be derived.

[0114] h={2ρ1 / ρ2 / (L1+4)×[2(4-d) 2 ×sinα×cosα+2(4-d) 2 ×sinα×cot(β-α)+v]tanα} 0.5 ;

[0115] Then the distance from the outer edge of the backfill area to the center of the tower leg = cotα × h + 2 - d;

[0116] The retaining wall thickness is 800 mm. Therefore, the distance from the outer edge of the retaining wall to the center of the tower leg is calculated as L3+2=cotα×h+2-d+0.8;

[0117] For the tower leg on the uphill side, due to the large slope, the excavation width of the working face is less than 4m. Therefore, L2≤4tanβ / (cotα+tanβ). Taking the maximum value for calculation, the horizontal section width of the entire tower base disturbance zone is W=4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d+0.8;

[0118] Assuming the tower base is square, the total disturbance area is calculated as A = (W / cosα). 2 The permanent land occupation is 1m outward from the center of each tower leg pile foundation, and the permanent land occupation area is A1=[(L1+2) / cosα] 2 The temporary land occupation disturbance area A2 = A - A1 is then calculated.

[0119] That is, A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 .

Claims

1. A method for predicting the temporary land occupation area of ​​tower foundation area in mechanized construction in hilly areas, characterized in that... The study includes the following steps: taking the high and low leg tower foundations on a single-sided slope as the research object, the excess soil generated from the site leveling of each tower leg before foundation excavation and the earthwork excavated by the mechanized rotary drilling rig are the main calculation objects. The construction passages are all constructed using a half-excavation and half-filling method. The earthwork self-balancing is not calculated. Other excavated excess soil is piled up along the edge of the construction passage. The area is predicted according to the case of strictly implementing the excess soil piling measures. Among them, the soil is piled up along the slope when the terrain slope is small, and the outer slope of the tower leg with a larger slope is protected by the barrier measures. 1) If the terrain slope is less than 15°, the excess soil will be piled into a turtle-back shape within the tower base area. The excess soil will be disposed of by stockpiling nearby, not exceeding the excavation area. A 4m x 4m wide working surface will be excavated at the tower leg location. The formula for calculating the temporary land occupation and disturbance area A2 is as follows: A2=[(L1+4) / cosα)] 2 -[(L1+2) / cosα] 2 ; Where L1 is the horizontal distance between adjacent tower legs, α is the horizontal angle of the slope, and A2 is the area of ​​temporary land occupation disturbance; 2) The terrain slope is 15°-35°, that is, the slope is still within the natural angle of repose. After the excavation of the remaining soil of the tower leg at the downslope position, it is half excavated and half filled in the direction of the downslope position, which exceeds a certain range outside the tower base. A 4m×4m wide working surface is excavated at the tower leg position. For terrain with a gentle slope, there are two scenarios: shallow excavation, where the working face width needs to be partially backfilled to reach 4m, and deep excavation, where the working face width is greater than 4m. ① For shallow excavation, the horizontal cross-sectional width of the entire tower foundation disturbance zone W=4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d; The temporary land occupation disturbance area A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 ; Where β is the slope angle formed after the working face is excavated; h is the maximum height difference of backfill earthwork; d is the width of the 4m square working face that needs to be backfilled when shallow excavation; ② For deep excavation, the horizontal cross-sectional width of the entire tower base disturbance zone W=4tanβ / (cotα+tanβ)+2+L1+cotα×(h-0.5)+2+d; The temporary land occupation disturbance area A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 ; Where β is the slope angle formed after the working face is excavated; h is the maximum height difference of the backfill soil; and d is the outer width of the 4m square working face during deep excavation. 3) When the terrain slope is greater than 35°, select an appropriate location on the downhill slope away from the lower tower leg to construct a retaining wall of a certain volume. The excess soil should be piled inside the retaining wall. The horizontal cross-sectional width of the entire tower foundation disturbance zone should be... W=4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d+0.8; The temporary land occupation disturbance area A2 = (W / cosα) 2 -[(L1+2) / cosα] 2 ; Where β is the slope angle formed after the working face is excavated; h is the retaining height of the retaining wall; and d is the width of the 4m square working face that needs to be backfilled.

2. The method for predicting the temporary land occupation area of ​​the tower foundation area for mechanized construction in hilly areas according to claim 1, characterized in that: When the terrain slope is less than 15°, the edge of the excess soil pile should be sloped at a ratio of 1:1.5, and the tower legs on the lower slope should be raised by 0.5-1.0m. Let the horizontal distance between adjacent tower legs be L1, then the horizontal cross-sectional width of the entire tower base disturbance zone is W = 2 + L1 + 2; Assuming the tower base is square, and assuming the horizontal angle of the slope is α, then the total disturbance area A = (W / cosα). 2 The permanent land occupation is defined as 1 meter outward from the center of each tower leg pile foundation. Therefore, the permanent land occupation area is A1 = [(L1+2) / cosα]. 2 Therefore, the temporary land occupation disturbance area A2 = A - A1 can be calculated. That is, A2=[(L1+4) / cosα)] 2 -[(L1+2) / cosα] 2 .

3. The method for predicting the temporary land occupation area of ​​the tower foundation area for mechanized construction in hilly areas according to claim 1, characterized in that: When the terrain slope is 15°-35°, the earthwork volume V1 of the excavation area is equal to the cross-sectional area S1 × the excavation width D1 of the tower leg. The earthwork volume for each tower leg foundation is v. The earthwork volume V2 of the backfill area is equal to the cross-sectional area S2 of the backfill area × the stacking length D2. The original density of the excavated soil is 1.1-1.3 times that of the backfill area. The designed density before excavation is ρ1, and the density of the backfill area is ρ2. The balance formula for earthwork excavation and backfilling is as follows: ρ1×(S1×D1+v)=ρ2×S2×D2 The excavation area at the tower leg location is 4m x 4m wide, therefore D1 = 4m; the backfill stacking length D2 is the distance L1 between the two tower leg foundations, extending 2m outwards on both sides. The earthwork balance formula is simplified to: ρ1×(S1×4+v)=ρ2×S2×(L1+4). ① For shallow excavation, assuming a 4m square working surface requires a backfill width of d, then S1=[(4-d) 2 ×sinα×cosα+(4-d) 2 ×sinα×cot(β-α)] / 2; Assuming the natural angle of repose of the slope after backfilling is γ, and the maximum elevation difference of the backfill soil is h, then S2=sin(γ-α) / sinα / sinγ×h 2 / 2; Based on the earthwork balance formula, the value of h can be derived. h={2sinα×sinγ{2[(4-d) 2 ×sinα×cosα+(4-d) 2 ×sinα×cot(β-α)]+v}ρ1 / ρ2 / (L1+4) / sin(γ-α)} 0.5 ; Then the distance from the outer edge of the backfill area to the center of the tower leg = cotα × h + 2 - d; For the tower leg on the upslope, since the slope is not steep, the excavation width of the working face is taken as 4m. Therefore, L2 = 4tanβ / (cotα + tanβ), where L2 is the horizontal distance from the outer edge of the excavation area on the upslope to the outer edge of the working face. The horizontal cross-sectional width of the entire tower foundation disturbance zone is then calculated. W=4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d; Assuming the tower base is square, the total disturbance area A = (W / cosα) 2 The permanent land occupation is 1m outward from the center of each tower leg pile foundation, and the permanent land occupation area is A1=[(L1+2) / cosα]. 2 The temporary land occupation disturbance area A2 = A - A1 is then calculated. That is, A2=(W / cosα) 2 -[(L1+2) / cosα] 2 ; ② For deep excavation, assuming the outer width of the 4m square working surface is d, then S1=[(4+d) 2 ×sinα×cosα+(4+d) 2 ×sinα×cot(β-α)] / 2; Assuming the natural angle of repose of the slope after backfilling is γ, the maximum elevation difference of the backfill soil is h, and the maximum height above the working surface is taken as 0.5m, then S2=[2(h-0.5)×cotα-h×cotγ]×h / 2-cotα×(h-0.5) 2 / 2; Based on the earthwork balance formula, the value of h can be derived. The distance from the outer edge of the backfill area to the center of the tower leg = cotα × (h - 0.5) + 2 + d; For the tower leg on the uphill slope, since the slope is not large, the excavation width of the working face is taken as 4m. Therefore, L2=4tanβ / (cotα+tanβ), and the horizontal section width of the entire tower base disturbance zone is W=4tanβ / (cotα+tanβ)+2+L1+cotα×(h-0.5)+2+d. Assuming the tower base is square, the total disturbance area A = (W / cosα) 2 The permanent land occupation is 1m outward from the center of each tower leg pile foundation, and the permanent land occupation area is A1=[(L1+2) / cosα]. 2 The temporary land occupation disturbance area A2 = A - A1 is then calculated. That is, A2=(W / cosα) 2 -[(L1+2) / cosα] 2 .

4. The method for predicting the temporary land occupation area of ​​the tower foundation area for mechanized construction in hilly areas according to claim 1, characterized in that: When the terrain slope is greater than 35°, the earthwork volume V1 of the excavation area is calculated as cross-sectional area S1 × tower leg excavation width D1, and the earthwork volume V2 of the backfill area is calculated as cross-sectional area S2 of the backfill area × retaining wall length D2. The original density of the excavated soil is 1.1-1.3 times that of the backfill area. The designed density before excavation is ρ1, and the density of the backfill area is ρ2. The excavation area at the tower leg location is 4m×4m wide, so D1=4m; the backfill stacking length D2 is usually 2m on both sides of the distance L1 between the two tower leg foundations. The earthwork balance formula is: ρ1×(S1×4+v)=ρ2×S2×(L1+4); Assuming a 4m square work surface requires a backfill width of d, then S1=[(4-d) 2 ×sinα×cosα+(4-d) 2 ×sinα×cot(β-α)] / 2; Assuming the retaining wall height is h, and the filter layer thickness is negligible, then S2 = cotα × h 2 / 2; Based on the earthwork balance formula, the value of the barrier height h can be derived; h={2ρ1 / ρ2 / (L1+4)×[2(4-d) 2 ×sinα×cosα+2(4-d) 2 ×sinα×cot(β-α)+v]tanα} 0.5 ; Then the distance from the outer edge of the backfill area to the center of the tower leg = cotα × h + 2 - d; The retaining wall thickness is 800mm. The distance from the outer edge of the retaining wall to the center of the tower leg is calculated as L3+2=cotα×h+2-d+0.8, where L3 is the horizontal distance from the outer edge of the retaining wall to the outer edge of the working face on the downhill slope. For the tower leg on the uphill slope, due to the large slope, the excavation width of the working face is less than 4m. Therefore, L2≤4tanβ / (cotα+tanβ). Taking the maximum value for calculation, the horizontal section width of the entire tower base disturbance zone is W=4tanβ / (cotα+tanβ)+2+L1+cotα×h+2-d+0.

8. Assuming the tower base is square, the total disturbance area A = (W / cosα) 2 The permanent land occupation is 1m outward from the center of each tower leg pile foundation, and the permanent land occupation area is A1=[(L1+2) / cosα]. 2 The temporary land occupation disturbance area A2 = A - A1 is then calculated. that is A2=(W / cosα) 2 -[(L1+2) / cosα] 2 .

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