CN115749415B - Embedded type dodder spiral shell tower foot structure and pull-up design method thereof - Google Patents
Embedded type dodder spiral shell tower foot structure and pull-up design method thereof Download PDFInfo
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Abstract
The invention provides an embedded twelve ground screw tower foot structure and a pull-up design method thereof, wherein a tower foot bottom plate is divided into four areas by a cross structure of a main boot plate, each group of ground screws comprises two external ground screws and one embedded ground screw, and the embedded ground screws are arranged on one side close to the center of the tower foot bottom plate in equal proportion; a group of ground screws are arranged in each area; the design method comprises the following steps: determining the nearest vertical distance from the center of the external ground screw to the center of the main boot plate, the vertical distance between the centers of two external ground screws in the same group of ground screws and the vertical distance from the center of the embedded ground screw to the center of the main boot plate according to the diameters of the ground screws; calculating the maximum upward pulling force of the ground screw under the upward pulling load; determining the effective anchoring length of the ground screw anchored in the concrete according to the diameter of the ground screw; calculating a yield calculation angle of the embedded ground screw, a yield calculation length of the embedded ground screw and a width of a tower foot bottom plate; and calculating the length and calculating the thickness of the bottom plate of the tower foot. The upward pulling bearing capacity of the ground screw structure is improved, and the ground screw structure is suitable for the condition of large load.
Description
Technical Field
The invention relates to the technical field of power transmission line tower foot type node design, in particular to an embedded twelve-ground screw tower foot structure and an upward pulling design method thereof.
Background
As the voltage level of the power transmission line engineering is continuously increased, particularly on extra-high voltage, heavy ice areas and multi-loop towers, the load effect of the power transmission line engineering is also improved in geometric index level, but the typical structure of the power transmission line engineering is only four-ground screw type and eight-ground screw type under the angle steel tower type, and the load capacity of the power transmission line engineering is limited by the structure when the load is very large, so that square and circular twelve-ground screw node structures are proposed in the prior art. As shown in fig. 3, the structure of the square twelve-ground screw joint is shown, and all twelve ground screws in the structure are uniformly arranged at four edges of a bottom plate of a square tower foot; fig. 4 shows a doughnut-shaped twelve-ground screw joint structure, in which twelve ground screws are uniformly arranged on the circumference of a circular tower foot bottom plate.
However, the defects of the two arrangement modes are obvious, the square twelve-ground screw node structure has larger node plates, more stiffening plates and large welding workload, and under the arrangement mode, the uneven internal force of the ground screw is very large, the internal force of the most corner ground screw is only about 20% of the internal ground screw, the bearing capacity of 4 diagonal ground screws cannot be fully exerted, and the consumable and the stress performance are poor; the difference of the upward pulling internal forces of 12 ground screws in the annular twelve-ground screw node structure is about 20%, and the two ground screws are relatively uniform, but the angle steel is required to be converted into a steel pipe type, annular stiffening plates and radial stiffening plates are required to be added, the stiffening plates are more, the welding workload is large, the construction difficulty is high, the force transmission and the structure are too complex, and the annular twelve-ground screw node structure is not suitable for wide application.
Therefore, a new structure of the twelve-ground screw tower foot capable of overcoming the above-mentioned defects is needed to adapt to the situation of high load, and a theoretical design method is needed to be put forward for the new structure of the twelve-ground screw tower foot to meet the design and construction requirements.
Disclosure of Invention
The invention aims to at least solve one of the technical problems that in the prior art, the existing four-ground screw and eight-ground screw structure type tower foot structure is difficult to adapt to the situation of large load, the existing twelve-ground screw node structure is large in node plate, more in stiffening plate, large in welding workload, very large in non-uniformity of the upward pulling internal force of the ground screw, complex in structure and large in construction difficulty.
For this purpose, the first aspect of the present invention provides an embedded twelve-ground screw tower foot structure.
The second aspect of the invention provides a pull-up design method for an embedded twelve-ground screw tower foot structure.
The invention provides an embedded twelve-ground screw tower foot structure, which comprises: a main material, ground screws, a tower foot bottom plate, a main boot plate and a secondary boot plate; the tower foot bottom plate is fixedly arranged on the ground through ground screws, the main boot plate is of a cross structure, the cross structure is symmetrically arranged on the tower foot bottom plate, the secondary boot plate is vertically arranged at the end part of the main boot plate, and the main material is fixedly connected with the main boot plate through bolts; the tower foot bottom plate is divided into four areas by the cross-shaped structure of the main boot plate, the ground screws are divided into four groups, each group of ground screws comprises two external ground screws and one embedded ground screw, the embedded ground screw is arranged on one side of the external ground screw, which is close to the center of the tower foot bottom plate, and the embedded ground screws are arranged on one side, which is close to the center of the tower foot bottom plate, in equal proportion; a group of ground screws are arranged in each region, and four groups of ground screws are arranged in a central symmetry manner by taking the center of the main boot plate as an axis and in an axisymmetry manner.
The invention also provides a method for upward drawing the embedded type twelve-ground screw tower foot structure, which is used for upward drawing the embedded type twelve-ground screw tower foot structure in the technical scheme, and comprises the following steps:
S1, determining the nearest vertical distance S 1 from the center of an external ground screw to the center of a main shoe plate according to the diameter of the ground screw, the vertical distance S 2 between the centers of two external ground screws in the same group of ground screws, and the vertical distance S 3 from the center of an embedded ground screw to the center of the main shoe plate; wherein, according to the sizes of S 1 and S 3, the upward internal force amplitude of the embedded ground screw and the external ground screw is controlled within 20 percent;
s2, calculating the maximum upward pulling force T max of the ground screw under the upward pulling load under the arrangement interval condition of S1;
S3, determining effective anchoring length l e of the ground screw anchored in the concrete according to the diameter of the ground screw;
S4, calculating a yield calculation angle of the embedded ground screw, a yield calculation length of the embedded ground screw and a width B of a tower foot bottom plate according to the nearest vertical distance S 1 from the center of the ground screw to the center of the main boot plate, the vertical distance S 2 between the centers of two ground screw in the group of ground screw and the vertical distance S 3 from the center of the embedded ground screw to the center of the main boot plate, which are determined in the S1;
S5, calculating the thickness T 0 of the tower foot bottom plate according to the maximum pulling-up force T max obtained in S2 and the yield calculation angle and the yield calculation length of the embedded ground screw obtained in S4.
According to the technical scheme, the upward-pulling design method of the embedded twelve-ground screw tower foot structure can also have the following additional technical characteristics:
In the above technical solution, the values of S 1、S2 and S 3 in S1 are as follows:
S1≥2.5d
S2≥2.5d～3.0d
S3＝mS1
wherein d is the diameter of the ground screw; the value of m is between 1.0 and 1.2, and the upward pulling internal force of the embedded ground screw and the external ground screw is close to each other in the interval, and the amplitude is within 20%.
In the above technical scheme, the calculation method of the maximum upward pulling force T max of the ground screw in S2 under the action of upward pulling load is as follows:
F is the up-pulling load of the whole tower foot node; n is the number of the ground snails; gamma is the group anchor coefficient of the ground screw in the concrete, and when the vertical distance between the embedded ground screw and the external ground screw is between 2.5d and 3d, gamma is 0.95; when the vertical distance between the embedded ground screw and the external ground screw is not less than 3d, gamma is 1.0.
In the technical scheme, the backing plate of the ground screw is square, the width of the backing plate is 2d, and the thickness of the backing plate is the same as that of the ground screw nut.
In the above technical scheme, the method for calculating the effective anchoring length l e of the ground screw in the concrete in the step S3 is as follows:
le≥35d
The ground screw anchor end is connected with an anchor plate which is square, the width is 2d, and the thickness is 20mm.
In the above technical solution, the method for calculating the width B of the tower foot bottom board in S4 is as follows:
B＝2(S1+S2+L)
wherein L is the vertical distance from the center of the conch to the edge of the bottom plate of the tower foot.
In the above technical scheme, the calculation method of the yield calculation angles alpha 1 and alpha 2 of the embedded oncomelania in the S4 and the yield calculation length L e of the embedded oncomelania is as follows:
In the above technical solution, the method for calculating the thickness t0 of the tower foot bottom plate in S5 is as follows:
Wherein f y is the yield strength of the tower foot bottom plate; gamma R is the material element coefficient of the steel.
In any of the above technical solutions, the design method further includes the following steps:
S6, designing the length l 1, the height h 1, the thickness t1 and the end distance a of the secondary shoe plate according to the nearest vertical distance S 1 from the center of the external screw to the center of the main shoe plate and the vertical distance S 2 between the centers of two external screws in the same group of external screws, so as to realize effective force transmission of the secondary shoe plate.
In the above technical scheme, the method for taking the values of the length l 1, the height h 1, the thickness t1 and the end distance a of the secondary shoe plate in the step S6 is as follows:
l1＝S1+S2-20
h1≥max(0.5l1,l1/30+40)
t1≥max(0.6tp,h1/15)
a≥t1
wherein t p is the thickness of the main shoe plate.
In summary, due to the adoption of the technical characteristics, the invention has the beneficial effects that:
The embedded twelve-ground screw tower foot structure provided by the invention has the same size as that of the eight-ground screw, has the similar steel consumption, can ensure the uniformity of stress of the ground screw, but can improve the up-pulling bearing capacity of the ground screw structure by 50% compared with the eight-ground screw, can adapt to the large load conditions such as extra-high voltage, heavy ice areas, multiple loops and the like, and has better economy and stress performance.
The embedded twelve-ground screw tower foot structure is reasonably designed, the balance degree of the upward pulling internal force of the embedded ground screw and the upward pulling internal force of the external ground screw is fully considered, the size of the tower foot bottom plate, the ground screw and the boot plate are designed on the basis that the upward pulling internal force of the embedded ground screw and the upward pulling internal force of the external ground screw are close, the blank of the twelve-ground screw tower foot structure design is filled, the novel twelve-ground screw tower foot structure design is guided, and the construction design can be carried out on high-load areas such as extra-high voltage areas, heavy ice areas, multiple loops and the like according to the design method set load conditions.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a method of pull-up design of an embedded twelve-ground screw tower foot structure in accordance with one embodiment of the present invention;
FIG. 2 is a schematic diagram of an embedded twelve-ground screw tower foot structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a prior art square twelve-ground screw node structure;
Fig. 4 is a schematic view of a prior art doughnut-shaped twelve-ground screw node structure.
The correspondence between the reference numerals and the component names in fig. 1 to 4 is:
1. a tower foot bottom plate; 2.a main boot plate; 3. a secondary shoe plate; 4. a main material; 5. embedding ground snails; 6. exocarpium Oncomelania.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
An in-line twelve-ground screw tower leg structure and a pull-up design method thereof according to some embodiments of the present invention are described below with reference to fig. 1 to 4.
Some embodiments of the present application provide an in-line twelve-ground screw tower foot structure.
As shown in fig. 1 to 4, a first embodiment of the present invention provides an embedded twelve-ground screw tower leg structure, which includes: a main material 4, twelve ground screws, a tower foot bottom plate 1, a main boot plate 2 and a secondary boot plate 3; as shown in fig. 2, the tower foot bottom plate 1 is fixedly mounted on the ground through ground screws, the main shoe plate 2 is of a cross-shaped welding structure, the cross-shaped welding structure is symmetrically arranged on the square tower foot bottom plate 1, the four secondary shoe plates 3 are respectively and vertically arranged at four end parts of the cross-shaped welding structure of the main shoe plate 2, and the main material 4 is fixedly connected with the main shoe plate 2 through bolts; the tower foot bottom plate 1 is divided into four square areas by the cross-shaped welding structure of the main boot plate 2, the ground screws are divided into four groups, each group of ground screws comprises two external ground screws 6 and one embedded ground screw 5, the embedded ground screw 5 is arranged on one side of the external ground screw 6, which is close to the center of the tower foot bottom plate 1, and the four embedded ground screws 5 are arranged on one side, which is close to the center of the tower foot bottom plate 1, in equal proportion; a group of ground screws are arranged in each square area, and the four groups of ground screws are arranged in a central symmetry way by taking the center of the main boot plate 2 as an axis and in an axial symmetry way by taking the main boot plate 2 as an axis;
the tower foot bottom plate 1 is of a square-like structure, as shown in fig. 2, wherein the tower foot bottom plate 1 is a square subjected to chamfering treatment, four groups of twelve ground screws are uniformly arranged on the tower foot bottom plate 1, eight external ground screws 6 are arranged on four edges of the square tower foot bottom plate 1 in pairs, and the centers of the eight ground screws are positioned on one square; the middle points of the four embedded ground screws 5 are sequentially connected to form a square which is the same as the center of the tower foot bottom plate 1.
The main material 4 is composed of combined angle steel and comprises two cross double combined angle steel and four combined angle steel.
The main shoe plate 2, the secondary shoe plate 3 and the tower foot bottom plate 1 are welded together through fillet welds to form a pull-up partition, so that pull-up internal force is transmitted.
Some embodiments of the present application provide a method for pull-up design of an embedded twelve-ground screw tower foot structure.
The second embodiment of the present invention provides a method for designing an upward-pulling structure of an embedded twelve-ground screw tower leg, and on the basis of the first embodiment, as shown in fig. 1 to 4, the method comprises the following steps:
S1, determining the nearest vertical distance S 1 from the center of an external ground screw to the center of a main shoe plate according to the diameter of the ground screw, the vertical distance S 2 between the centers of two external ground screws in the same group of ground screws, and the vertical distance S 3 from the center of an embedded ground screw to the center of the main shoe plate; wherein, according to the sizes of S 1 and S 3, the upward internal force amplitude of the embedded ground screw and the external ground screw is controlled within 20 percent;
The values of S 1、S2 and S 3 in S1 are as follows:
S1≥2.5d
S2≥2.5d～3.0d
S3＝mS1
wherein d is the diameter of the ground screw; the value of m is between 1.0 and 1.2, and the upward pulling internal force of the embedded ground screw and the external ground screw is close to each other in the interval, and the amplitude is within 20%.
S2, calculating the maximum upward pulling force T max of the ground screw under the upward pulling load under the arrangement interval condition of S1;
The calculation method of the maximum upward pulling force T max of the oncomelania in S2 under the action of upward pulling load is as follows:
F is the up-pulling load of the whole tower foot node; n is the number of the ground snails; gamma is the group anchor coefficient of the ground screw in the concrete, and when the vertical distance between the embedded ground screw and the external ground screw is between 2.5d and 3d, gamma is 0.95; when the vertical distance between the embedded ground screw and the external ground screw is not less than 3d, gamma is 1.0.
The backing plate of the ground screw is square, the width of the backing plate is 2d, and the thickness of the backing plate is the same as that of the ground screw nut.
S3, determining effective anchoring length l e of the ground screw anchored in the concrete according to the diameter of the ground screw;
the calculation method of the effective anchoring length l e of the ground screw anchored in the concrete in the S3 is as follows:
le≥35d
The ground screw anchor end is connected with an anchor plate which is square, the width is 2d, and the thickness is 20mm.
S4, calculating a yield calculation angle of the embedded ground screw, a yield calculation length of the embedded ground screw and a width B of a tower foot bottom plate according to the nearest vertical distance S 1 from the center of the ground screw to the center of the main boot plate, the vertical distance S 2 between the centers of two ground screw in the group of ground screw and the vertical distance S 3 from the center of the embedded ground screw to the center of the main boot plate, which are determined in the S1;
the method for calculating the width B of the tower foot bottom plate in the S4 is as follows:
B＝2(S1+S2+L)
wherein L is the vertical distance from the center of the conch to the edge of the bottom plate of the tower foot.
The calculation methods of the yield calculation angles alpha 1 and alpha 2 of the embedded oncomelania and the yield calculation length L e of the embedded oncomelania in the S4 are as follows:
S5, calculating the thickness T 0 of the tower foot bottom plate according to the maximum pulling-up force T max obtained in S2 and the yield calculation angle and the yield calculation length of the embedded ground screw obtained in S4.
The calculation method of the thickness t 0 of the tower foot bottom plate in the S5 is as follows:
Wherein f y is the yield strength of the tower foot bottom plate; gamma R is the material term coefficient of the steel, 1.09 for Q235, 1.15 for Q355, and 1.125 for Q420.
The third embodiment of the present invention provides a method for designing an upward-pulling structure of an embedded twelve-ground screw tower leg, and on the basis of any one of the above embodiments, as shown in fig. 1 to 4, the method comprises the following steps:
S1, determining the nearest vertical distance S 1 from the center of an external ground screw to the center of a main shoe plate according to the diameter of the ground screw, the vertical distance S 2 between the centers of two external ground screws in the same group of ground screws, and the vertical distance S 3 from the center of an embedded ground screw to the center of the main shoe plate; wherein, according to the sizes of S 1 and S 3, the upward internal force amplitude of the embedded ground screw and the external ground screw is controlled within 20 percent;
The values of S 1、S2 and S 3 in S1 are as follows:
S1≥2.5d
S2≥2.5d～3.0d
S3＝mS1
wherein d is the diameter of the ground screw; the value of m is between 1.0 and 1.2, and the upward pulling internal force of the embedded ground screw and the external ground screw is close to each other in the interval, and the amplitude is within 20%.
S2, calculating the maximum upward pulling force T max of the ground screw under the upward pulling load under the arrangement interval condition of S1;
The calculation method of the maximum upward pulling force T max of the oncomelania in S2 under the action of upward pulling load is as follows:
F is the up-pulling load of the whole tower foot node; n is the number of the ground snails; gamma is the group anchor coefficient of the ground screw in the concrete, and when the vertical distance between the embedded ground screw and the external ground screw is between 2.5d and 3d, gamma is 0.95; when the vertical distance between the embedded ground screw and the external ground screw is not less than 3d, gamma is 1.0.
The backing plate of the ground screw is square, the width of the backing plate is 2d, and the thickness of the backing plate is the same as that of the ground screw nut.
S3, determining effective anchoring length l e of the ground screw anchored in the concrete according to the diameter of the ground screw;
the calculation method of the effective anchoring length l e of the ground screw anchored in the concrete in the S3 is as follows:
le≥35d
The ground screw anchor end is connected with an anchor plate which is square, the width is 2d, and the thickness is 20mm.
S4, calculating a yield calculation angle of the embedded ground screw, a yield calculation length of the embedded ground screw and a width B of a tower foot bottom plate according to the nearest vertical distance S 1 from the center of the ground screw to the center of the main boot plate, the vertical distance S 2 between the centers of two ground screw in the group of ground screw and the vertical distance S 3 from the center of the embedded ground screw to the center of the main boot plate, which are determined in the S1;
the method for calculating the width B of the tower foot bottom plate in the S4 is as follows:
B＝2(S1+S2+L)
wherein L is the vertical distance from the center of the conch to the edge of the bottom plate of the tower foot.
The calculation methods of the yield calculation angles alpha 1 and alpha 2 of the embedded oncomelania and the yield calculation length L e of the embedded oncomelania in the S4 are as follows:
S5, calculating the thickness T 0 of the tower foot bottom plate according to the maximum pulling-up force T max obtained in S2 and the yield calculation angle and the yield calculation length of the embedded ground screw obtained in S4.
The calculation method of the thickness t 0 of the tower foot bottom plate in the S5 is as follows:
Wherein f y is the yield strength of the tower foot bottom plate; gamma R is the material term coefficient of the steel, 1.09 for Q235, 1.15 for Q355, and 1.125 for Q420.
S6, designing the length l 1, the height h 1, the thickness t 1 and the end distance a of the secondary shoe plate according to the nearest vertical distance S 1 from the center of the external screw to the center of the main shoe plate and the vertical distance S 2 between the centers of two external screws in the same group of external screws, so as to realize effective force transmission of the secondary shoe plate.
The length l 1, the height h 1, the thickness t1 and the end distance a of the secondary shoe plate in the S6 are obtained as follows:
l1＝S1+S2-20
h1≥max(0.5l1,l1/30+40)
t1≥max(0.6tp,h1Δ15)
a≥t1
Wherein t p is the thickness of the main shoe plate, the thickness t p of the shoe plate is 0.6-1.0 times of the thickness of the angle steel limb of the main material, but not less than 20mm, and the height of the shoe plate is determined according to the number of connecting bolts.
In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An embedded twelve-ground screw tower foot structure comprising: a main material (4), ground screws, a tower foot bottom plate (1), a main boot plate (2) and a secondary boot plate (3); the tower foot bottom plate (1) is fixedly arranged on the ground through ground screws, the main shoe plate (2) is of a cross structure, the cross structure is symmetrically arranged on the tower foot bottom plate (1), the secondary shoe plate (3) is vertically arranged at the end part of the main shoe plate (2), and the main material (4) is fixedly connected with the main shoe plate (2) through bolts; the ground screw is characterized in that the tower foot bottom plate (1) is divided into four areas by the cross-shaped structure of the main boot plate (2), the ground screw is divided into four groups, each group of ground screws comprises two external ground screws (6) and one embedded ground screw (5), and the embedded ground screw (5) is arranged on one side, close to the center of the tower foot bottom plate (1), of the external ground screw (6); a group of ground screws are arranged in each region, and the four groups of ground screws are arranged in a central symmetry way by taking the center of the main boot plate (2) as an axis and in an axial symmetry way by taking the main boot plate (2) as an axis;
The nearest vertical distance S 1 from the center of each external ground screw (6) to the center of the main shoe plate (2), the vertical distance S 2 between the centers of two external ground screws (6) in the same group of external ground screws and the vertical distance S 3 from the center of each embedded ground screw (5) to the center of the main shoe plate (2) are determined according to the ground screw diameter, and the upward internal force amplitude of each embedded ground screw (5) and each external ground screw (6) is controlled within 20 percent according to the sizes of S 1 and S 3; the values of S 1、S2 and S 3 are as follows:
S1≥2.5d
S2≥2.5d～3.0d
S3＝mS1
wherein d is the diameter of the ground screw; the value of m is between 1.0 and 1.2, and the upward pulling internal force of the embedded ground screw and the external ground screw is close to each other in the interval, and the amplitude is within 20%.
2. The method for designing the pull-up of the embedded type twelve-ground screw tower foot structure is characterized by comprising the following steps of:
S1, determining the nearest vertical distance S 1 from the center of an external ground screw to the center of a main shoe plate according to the diameter of the ground screw, the vertical distance S 2 between the centers of two external ground screws in the same group of ground screws, and the vertical distance S 3 from the center of an embedded ground screw to the center of the main shoe plate; wherein, according to the sizes of S 1 and S 3, the upward internal force amplitude of the embedded ground screw and the external ground screw is controlled within 20 percent; the values of S 1、S2 and S 3 are as follows:
S1≥2.5d
S2≥2.5d～3.0d
S3＝mS1
wherein d is the diameter of the ground screw; m has a value of 1.0-1.2, and during the interval, the upward pulling internal force of the embedded ground screw and the external ground screw is close, and the amplitude is within 20%;
s2, calculating the maximum upward pulling force T max of the ground screw under the upward pulling load under the arrangement interval condition of S1;
S3, determining effective anchoring length l e of the ground screw anchored in the concrete according to the diameter of the ground screw;
S4, calculating a yield calculation angle of the embedded ground screw, a yield calculation length of the embedded ground screw and a width B of a tower foot bottom plate according to the nearest vertical distance S 1 from the center of the ground screw to the center of the main boot plate, the vertical distance S 2 between the centers of two ground screw in the group of ground screw and the vertical distance S 3 from the center of the embedded ground screw to the center of the main boot plate, which are determined in the S1;
S5, calculating the thickness T 0 of the tower foot bottom plate according to the maximum pulling-up force T max obtained in S2 and the yield calculation angle and the yield calculation length of the embedded ground screw obtained in S4.
3. The method for designing the pull-up of the embedded twelve-ground screw tower foot structure according to claim 2, wherein the method for calculating the maximum pull-up force T max of the ground screw under the action of the pull-up load in S2 is as follows:
F is the up-pulling load of the whole tower foot node; n is the number of the ground snails; gamma is the group anchor coefficient of the ground screw in the concrete, and when the vertical distance between the embedded ground screw and the external ground screw is between 2.5d and 3d, gamma is 0.95; when the vertical distance between the embedded ground screw and the external ground screw is not less than 3d, gamma is 1.0.
4. The method for designing the pull-up of the embedded twelve-ground screw tower foot structure according to claim 3, wherein the method for calculating the effective anchoring length l e of the ground screw in the concrete in the step S3 is as follows:
le≥35d。
5. The method for designing the pull-up of the embedded twelve-ground screw tower foot structure according to claim 3, wherein the method for calculating the width B of the tower foot bottom plate in S4 is as follows:
B＝2(S1+S2+L)
wherein L is the vertical distance from the center of the conch to the edge of the bottom plate of the tower foot.
6. The method for designing the pull-up of the embedded twelve-ground screw tower foot structure according to claim 3, wherein the method for calculating the yield calculation angles alpha 1 and alpha 2 of the embedded ground screw and the yield calculation length L e of the embedded ground screw in S4 is as follows:
7. the method for designing the pull-up of the embedded twelve-ground screw tower foot structure according to claim 6, wherein the method for calculating the thickness t 0 of the tower foot bottom plate in the step S5 is as follows:
Wherein f y is the yield strength of the tower foot bottom plate; gamma R is the material element coefficient of the steel.
8. The method of pull-up design of an in-line twelve-ground screw pitch structure as recited in any one of claims 2 to 7, further comprising the steps of:
S6, designing the length l 1, the height h 1, the thickness t 1 and the end distance a of the secondary shoe plate according to the nearest vertical distance S 1 from the center of the external screw to the center of the main shoe plate and the vertical distance S 2 between the centers of two external screws in the same group of external screws, so as to realize effective force transmission of the secondary shoe plate.
9. The method for designing the pull-up of the embedded twelve-ground screw tower foot structure according to claim 8, wherein the values of the length l 1, the height h 1, the thickness t 1 and the end distance a of the secondary shoe plate in the step S6 are as follows:
l1＝S1+S2-20
h1≥max(0.5l1,l1/30+40)
t1≥max(0.6tp,h1/15)
a≥t1
wherein t p is the thickness of the main shoe plate.
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