Variable cross-section assembly type spiral anchor foundation

Abstract

The invention relates to the technical field of power transmission line foundations, and discloses a variable cross-section assembly type spiral anchor foundation which comprises an anchor rod, an anchor disc, a sleeve, an anchor pipe, a connecting pipe and a connecting plate. The multiple anchor discs are arranged on the anchor rod at intervals in the axial direction of the anchor rod. The bottom end of the sleeve is detachably connected with the top end of the anchor rod, the top end of the sleeve is fixedly connected with the bottom end of the anchor pipe, and the diameter of the anchor pipe is larger than that of the anchor rod. The bottom end of the connecting pipe is detachably connected with the top end of the anchor pipe, and the connecting plate is fixedly arranged at the top end of the connecting pipe. According to the variable cross-section assembly type spiral anchor foundation, the horizontal bearing capacity performance is improved, the weight of the anchor rod is reduced, the use amount of manufacturing materials is reduced, the size and weight of a single piece are reduced, and transportation in areas such as desert is facilitated. After all the parts are transported to an installation site, connection between the sleeve and the anchor rod and connection between the connecting pipe and the anchor pipe can be conducted on site, site welding is avoided, and operation is easy.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission line foundations, in particular to a variable-section assembled spiral anchor foundation. Background Art

[0002] The spiral anchor foundation is an innovative environmentally friendly foundation, consisting of spiral anchors and upper caps. It is an anchor structure that mainly uses deep soil to resist the action of the upper structure. The spiral anchor foundation has high construction efficiency, short cycle, and does not generate earthwork volume; it mainly relies on deep anchor plates to transmit force, and the upper soil layer has little effect on the vertical bearing capacity of the foundation; the structural components can be 100% prefabricated in the factory, and the quality of the foundation is guaranteed; there are fewer node connections, and the construction and transportation are convenient; the foundation material consumption is small, and the use of all-steel structure can achieve zero concrete consumption, which has significant social, economic and ecological benefits.

[0003] At present, the spiral anchor foundation of power transmission line projects still has the following disadvantages: the anchor rod of the spiral anchor foundation is relatively thin, prone to horizontal deformation, and has poor horizontal bearing capacity; on-site welding is required during construction, which makes the construction difficult and the quality difficult to ensure; when the spiral anchor foundation is used in desert areas, the size and weight of each piece must also be controlled to facilitate construction transportation and on-site assembly.

[0004] Therefore, there is an urgent need for a variable-section assembled spiral anchor foundation to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a variable-section assembled spiral anchor foundation, which can improve the horizontal bearing capacity performance, reduce the weight of the anchor rod, and avoid on-site welding.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A variable-section assembled spiral anchor foundation, comprising: an anchor rod, an anchor plate, a sleeve, an anchor pipe, a connecting pipe and a connecting plate;

[0008] The anchor discs are provided in plurality, and the plurality of anchor discs are provided on the anchor rod at intervals along the axial direction of the anchor rod;

[0009] The bottom end of the sleeve is detachably connected to the top end of the anchor rod, and the top end is fixedly connected to the bottom end of the anchor pipe, and the diameter of the anchor pipe is greater than the diameter of the anchor rod;

[0010] The bottom end of the connecting pipe is detachably connected to the top end of the anchor pipe, and the connecting plate is fixedly arranged on the top end of the connecting pipe.

[0011] As an improvement of the above technical solution, the sleeve and the anchor rod as well as the connecting pipe and the anchor pipe are plugged together.

[0012] As an improvement of the above technical solution, it also includes a first connecting bolt and a second connecting bolt;

[0013] The anchor rod and the sleeve are both provided with a first connection hole and a second connection hole, and the axis of the first connection hole is perpendicular to the axis of the second connection hole;

[0014] The first connecting bolt passes through the first connecting hole on the sleeve and the anchor rod to connect the sleeve and the anchor rod, and the second connecting bolt passes through the second connecting hole on the sleeve and the anchor rod to connect the sleeve and the anchor rod.

[0015] As an improvement of the above technical solution, a plurality of first connecting holes and a plurality of second connecting holes are provided on the anchor rod, and are spaced apart along the axial direction of the anchor rod;

[0016] The sleeve is provided with a plurality of first connecting holes and second connecting holes, and the first connecting holes and second connecting holes are arranged at intervals along the axial direction of the sleeve;

[0017] The distance between two adjacent first connection holes on the sleeve is equal to the distance between two adjacent first connection holes on the anchor rod;

[0018] The distance between two adjacent second connection holes on the sleeve is equal to the distance between two adjacent second connection holes on the anchor rod.

[0019] As an improvement of the above technical solution, it also includes a third connecting bolt and a fourth connecting bolt;

[0020] The anchor pipe and the connecting pipe are both provided with a third connecting hole and a fourth connecting hole, and the axis of the third connecting hole is perpendicular to the axis of the fourth connecting hole;

[0021] The third connecting bolt passes through the third connecting hole on the anchor pipe and the connecting pipe to connect the anchor pipe and the connecting pipe, and the fourth connecting bolt passes through the fourth connecting hole on the anchor pipe and the connecting pipe to connect the anchor pipe and the connecting pipe.

[0022] As an improvement of the above technical solution, a plurality of third connection holes and a plurality of fourth connection holes are provided on the anchor pipe, and are spaced apart along the axial direction of the anchor pipe;

[0023] The third connecting hole and the fourth connecting hole are provided in plurality on the connecting pipe, and are arranged at intervals along the axial direction of the connecting pipe;

[0024] The distance between two adjacent third connection holes on the connecting pipe is equal to the distance between two adjacent third connection holes on the anchor pipe;

[0025] The distance between two adjacent fourth connection holes on the connection pipe is equal to the distance between two adjacent fourth connection holes on the anchor pipe.

[0026] As an improvement of the above technical solution, it also includes a fixing plate, which is arranged in the anchor pipe and fixedly connected to the inner wall of the anchor pipe. The fixing plate is perpendicular to the axis of the anchor pipe, and the top end of the sleeve is fixedly connected to the fixing plate.

[0027] As an improvement of the above technical solution, the fixing plate is a cross-shaped plate, and the four plate ends of the cross-shaped plate are fixedly connected to the inner wall of the anchor pipe.

[0028] As an improvement of the above technical solution, a sealing anchor plate is further included, wherein the sealing anchor plate is fixedly arranged at the bottom end of the anchor pipe and fixedly connected to the outer wall of the sleeve.

[0029] As an improvement of the above technical solution, the anchor pipe comprises a coaxially arranged equal diameter section and a variable diameter section;

[0030] The bottom end of the equal diameter section is fixedly connected to the top end of the variable diameter section, and the bottom end of the variable diameter section is fixedly connected to the top end of the sleeve;

[0031] The diameter of the top end of the variable diameter section is equal to the diameter of the equal diameter section, and the diameter of the bottom end is equal to the diameter of the sleeve, and the diameter of the sleeve is smaller than the diameter of the equal diameter section.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The variable-section assembled spiral anchor foundation of the present invention has an anchor pipe arranged at the top, and the diameter of the anchor pipe is greater than the diameter of the anchor rod, thereby improving the horizontal bearing capacity performance of the variable-section assembled spiral anchor foundation. Compared with the anchor rod arranged throughout the entire length of the anchor pipe, the top end of the anchor rod in the present invention is detachably connected to the anchor pipe through a sleeve, and the connecting plate is detachably connected to the top end of the anchor pipe through a connecting pipe, which reduces the length of the anchor rod, thereby reducing the weight of the anchor rod and reducing the amount of manufacturing materials used. In addition, due to the detachable connection between the connecting pipe and the anchor pipe, and the detachable connection between the sleeve and the anchor rod, the variable-section assembled spiral anchor foundation of the present invention can be disassembled from the connecting pipe and the anchor pipe, and the sleeve and the anchor rod during transportation, thereby reducing the size and weight of a single piece, and facilitating transportation in deserts and other areas. After the various components are transported to the installation site, the sleeve and the anchor rod and the connecting pipe and the anchor pipe can be connected on site, avoiding on-site welding, and the operation is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a variable-section assembled spiral anchor foundation provided in Embodiment 1 of the present invention;

[0035] Figure 2 yes Figure 1 Sectional view at AA in the middle;

[0036] Figure 3 It is a cross-sectional view of the connection between the anchor pipe and the connecting pipe of the variable-section assembled spiral anchor foundation provided in the first embodiment of the present invention;

[0037] Figure 4 It is a structural schematic diagram of a variable-section assembled spiral anchor foundation provided by the second embodiment of the present invention;

[0038] Figure 5 It is a cross-sectional view of the connection between the anchor pipe and the connecting pipe of the variable-section assembled spiral anchor foundation provided in the second embodiment of the present invention.

[0039] In the figure:

[0040] 11. Anchor rod; 12. Anchor plate; 13. Casing;

[0041] 14. Anchor pipe; 141. Constant diameter section; 142. Variable diameter section;

[0042] 15. Connecting pipe; 16. Connecting plate; 17. First connecting bolt; 18. Second connecting bolt; 19. Third connecting bolt; 20. Fourth connecting bolt;

[0043] 21. fixed plate; 211. plate end;

[0044] 22. Sealing anchor plate; 23. Stiffening plate. DETAILED DESCRIPTION

[0045] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0049] Embodiment 1

[0050] like Figure 1-Figure 3 As shown, this embodiment provides a variable-section assembled spiral anchor foundation, including an anchor rod 11, an anchor plate 12, a sleeve 13, an anchor pipe 14, a connecting pipe 15 and a connecting plate 16. A plurality of anchor plates 12 are provided, and a plurality of anchor plates 12 are arranged on the anchor rod 11 at intervals along the axial direction of the anchor rod 11. The bottom end of the sleeve 13 is detachably connected to the top end of the anchor rod 11, and the top end is fixedly connected to the bottom end of the anchor pipe 14, and the diameter of the anchor pipe 14 is greater than the diameter of the anchor rod 11. The bottom end of the connecting pipe 15 is detachably connected to the top end of the anchor pipe 14, and the connecting plate 16 is fixedly arranged at the top end of the connecting pipe 15. The anchor rod 11, the sleeve 13, the anchor pipe 14 and the connecting pipe 15 are all coaxially arranged.

[0051] The variable cross-section assembled spiral anchor foundation provided in this embodiment has an anchor pipe 14 arranged on the upper part, and the diameter of the anchor pipe 14 is greater than the diameter of the anchor rod 11, thereby improving the horizontal bearing capacity performance of the variable cross-section assembled spiral anchor foundation. Compared with the anchor rod 11 that runs through the anchor pipe 14, the top of the anchor rod 11 in this embodiment is detachably connected to the anchor pipe 14 through the sleeve 13, and the connecting plate 16 is detachably connected to the top of the anchor pipe 14 through the connecting pipe 15, which reduces the length of the anchor rod 11, thereby reducing the weight of the anchor rod 11 and reducing the amount of manufacturing materials used. In this embodiment, all components of the variable cross-section assembled spiral anchor foundation are made of steel, and the weight reduction of the anchor rod 11 is also a reduction in the amount of steel used. In addition, since the connecting pipe 15 is detachably connected to the anchor pipe 14, and the sleeve 13 is detachably connected to the anchor rod 11, the variable cross-section assembled spiral anchor foundation in this embodiment can be transported by disassembling the connecting pipe 15 from the anchor pipe 14 and disassembling the sleeve 13 from the anchor rod 11, thereby reducing the size and weight of the single piece, and facilitating transportation in deserts and other areas. After the components are transported to the installation site, the sleeve 13 and the anchor rod 11 as well as the connection between the connecting pipe 15 and the anchor pipe 14 can be connected on site, thus avoiding on-site welding and simplifying the operation.

[0052] Alternatively, if Figure 1 and Figure 3 As shown, the sleeve 13 and the anchor rod 11 as well as the connecting pipe 15 and the anchor pipe 14 are plugged in. Plug-in first and then connection is performed, which is conducive to a more secure connection.

[0053] Furthermore, if Figure 1 and Figure 3 As shown, the variable cross-section assembled spiral anchor foundation provided in this embodiment also includes a first connecting bolt 17 and a second connecting bolt 18. The anchor rod 11 and the sleeve 13 are both provided with a first connecting hole and a second connecting hole, and the axis of the first connecting hole is perpendicular to the axis of the second connecting hole. The first connecting bolt 17 passes through the first connecting hole on the sleeve 13 and the anchor rod 11 to connect the sleeve 13 and the anchor rod 11, and the second connecting bolt 18 passes through the second connecting hole on the sleeve 13 and the anchor rod 11 to connect the sleeve 13 and the anchor rod 11. Since the diameter (that is, the outer diameter) of the anchor pipe 14 is larger than the diameter of the anchor rod 11, the inner diameter of the sleeve 13, which is used as the sleeve 13 connecting the anchor pipe 14 and the anchor rod 11, is usually larger than the outer diameter of the anchor rod 11. Therefore, in this embodiment, the top end of the anchor rod 11 is inserted into the sleeve 13. In this embodiment, the inner diameter of the sleeve 13 is 2-4 mm larger than the outer diameter of the anchor rod 11. The sleeve 13 and the anchor rod 11 are connected by the cooperation of the first connecting bolt 17 and the second connecting bolt 18. The first connecting bolt 17 and the second connecting bolt 18 are arranged at 90 degrees, so that the anchor rod 11 and the sleeve 13 are firmly connected and the relative position is stable.

[0054] Alternatively, if Figure 1 and Figure 3 As shown, the anchor rod 11 is provided with a plurality of first connection holes and the second connection holes, and are spaced apart along the axial direction of the anchor rod 11. The sleeve 13 is provided with a plurality of first connection holes and the second connection holes, and are spaced apart along the axial direction of the sleeve 13. The distance between two adjacent first connection holes on the sleeve 13 is equal to the distance between two adjacent first connection holes on the anchor rod 11. The distance between two adjacent second connection holes on the sleeve 13 is equal to the distance between two adjacent second connection holes on the anchor rod 11. The plurality of first connection holes and the second connection holes are provided, so that the number of the first connection bolts 17 and the second connection bolts 18 can be selected as needed, and the specific number of the first connection bolts 17 and the second connection bolts 18 is determined according to calculation.

[0055] Alternatively, if Figure 1 and Figure 3 As shown, the variable cross-section assembled spiral anchor foundation provided in this embodiment also includes a third connecting bolt 19 and a fourth connecting bolt 20. The anchor pipe 14 and the connecting pipe 15 are both provided with a third connecting hole and a fourth connecting hole, and the axis of the third connecting hole is perpendicular to the axis of the fourth connecting hole. The third connecting bolt 19 passes through the third connecting hole on the anchor pipe 14 and the connecting pipe 15 to connect the anchor pipe 14 and the connecting pipe 15, and the fourth connecting bolt 20 passes through the fourth connecting hole on the anchor pipe 14 and the connecting pipe 15 to connect the anchor pipe 14 and the connecting pipe 15. The size of the connecting pipe 15 is selected according to the required size for connection with the anchor pipe 14 and the connecting plate 16. Generally, the inner diameter of the anchor pipe 14 is larger than the outer diameter of the connecting pipe 15. Therefore, in this embodiment, the connecting pipe 15 is inserted into the anchor pipe 14. The connecting pipe 15 is connected to the anchor pipe 14 by the cooperation of the third connecting bolt 19 and the fourth connecting bolt 20. The third connecting bolt 19 and the fourth connecting bolt 20 are arranged at 90 degrees, so that the connection between the anchor pipe 14 and the connecting pipe 15 is firm and relatively stable in position. In this embodiment, the top end of the connecting pipe 15 is welded and fixed to the connecting plate 16. The variable-section assembled spiral anchor foundation further includes a stiffening plate 23, which connects the connecting plate 16 and the connecting pipe 15, and is welded and fixed between the stiffening plate 23 and the connecting plate 16 and between the stiffening plate 23 and the connecting pipe 15. A plurality of stiffening plates 23 are arranged at intervals along the circumference of the connecting pipe 15.

[0056] Alternatively, if Figure 1 and Figure 3As shown, the third connection hole and the fourth connection hole on the anchor pipe 14 are both provided in plurality, and are all spaced apart along the axial direction of the anchor pipe 14. The third connection hole and the fourth connection hole on the connecting pipe 15 are both provided in plurality, and are all spaced apart along the axial direction of the connecting pipe 15. The distance between two adjacent third connection holes on the connecting pipe 15 is equal to the distance between two adjacent third connection holes on the anchor pipe 14. The distance between two adjacent fourth connection holes on the connecting pipe 15 is equal to the distance between two adjacent fourth connection holes on the anchor pipe 14. A plurality of first connection holes and second connection holes are provided, so that the number of the first connection bolts 17 and the second connection bolts 18 can be selected as needed, and the specific number of the first connection bolts 17 and the second connection bolts 18 is determined according to calculation.

[0057] Alternatively, if Figure 1 and Figure 2 As shown, the variable cross-section assembled spiral anchor foundation provided in this embodiment also includes a fixing plate 21, which is arranged in the anchor pipe 14 and fixedly connected to the inner wall of the anchor pipe 14. The fixing plate 21 is perpendicular to the axis of the anchor pipe 14, and the top end of the sleeve 13 is fixedly connected to the fixing plate 21. Specifically, in this embodiment, the top end of the sleeve 13 is welded and fixed to the fixing plate 21. The setting of the fixing plate 21 makes the fixing between the sleeve 13 and the anchor pipe 14 more firm.

[0058] Alternatively, if Figure 1 and Figure 2 As shown, the fixing plate 21 is a cross-shaped plate, and the four plate ends 211 of the cross-shaped plate are all fixedly connected to the inner wall of the anchor pipe 14. In this embodiment, the four plate ends 211 of the fixing plate 21 are all welded and fixed to the inner wall of the anchor pipe 14. The fixing plate 21 of the cross-shaped plate allows the earth screwed into the anchor pipe 14 to enter the upper part of the fixing plate 21 from the edge area when entering the interior of the anchor pipe 14, thereby reducing the power requirement for the construction machinery.

[0059] Alternatively, if Figure 1 and Figure 3 As shown, the variable cross-section assembled spiral anchor foundation provided in this embodiment also includes a sealing anchor plate 22, which is fixedly arranged at the bottom end of the anchor pipe 14 and fixedly connected to the outer wall of the casing 13. The sealing anchor plate 22 is welded and fixed between the anchor pipe 14 and between the sealing anchor plate 22 and the casing 13.

[0060] Embodiment 2

[0061] like Figure 4 and Figure 5 As shown, this embodiment provides a variable-section assembled spiral anchor foundation. The variable-section assembled spiral anchor foundation in this embodiment is basically the same as that in the first embodiment, except that:

[0062] The anchor pipe 14 in this embodiment includes a coaxially arranged equal diameter section 141 and a variable diameter section 142. The bottom end of the equal diameter section 141 is fixedly connected to the top end of the variable diameter section 142, and the bottom end of the variable diameter section 142 is fixedly connected to the top end of the sleeve 13. The diameter of the top end of the variable diameter section 142 is equal to the diameter of the equal diameter section 141, and the diameter of the bottom end is equal to the diameter of the sleeve 13, and the diameter of the sleeve 13 is smaller than the diameter of the equal diameter section 141. When the diameter of the anchor pipe 14 is not greater than twice the diameter of the anchor rod 11, the lower part of the anchor pipe 14 can be directly made into a gradual structure and welded to the sleeve 13, so that the fixing plate 21 and the sealing anchor plate 22 can be eliminated to simplify the structure.

[0063] In addition, the inner diameter of the connecting tube 15 in this embodiment is larger than the outer diameter of the equal diameter section 141 of the anchor tube 14, and the top end of the anchor tube 14 is inserted into the connecting tube 15. When the required diameter of the connecting tube 15 is larger, and the diameter of the anchor tube 14 is not large, the design of inserting the top end of the anchor tube 14 into the connecting tube 15 can be adopted, so that the diameter of the connecting tube 15 is no longer limited by the diameter of the anchor tube 14, and it is convenient to select a connecting tube 15 with a larger diameter. In this embodiment, the inner diameter of the connecting tube 15 is 2-3 mm larger than the outer diameter of the anchor tube 14.

[0064] The variable cross-section assembled spiral anchor foundation of the present invention can realize differentiated design according to the relative size of the upper anchor pipe 14 and the lower anchor rod 11, and simplify the structure as much as possible while meeting the horizontal bearing performance requirements of the foundation, so as to achieve design optimization and material saving. The lower anchor rod 11 does not pass through the upper anchor pipe 14, which can reduce the steel consumption of the foundation. In addition, the size and weight of each component can be effectively controlled, with the size of each component not exceeding 6m and the weight of each component not exceeding 1t, so as to realize assembled design, facilitate construction, transportation and ready-made assembly.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A variable-section assembled spiral anchor foundation, characterized in that: include: Anchor rod (11), anchor plate (12), casing (13), anchor pipe (14), connecting pipe (15) and connecting plate (16); A plurality of anchor plates (12) are provided, and the plurality of anchor plates (12) are arranged on the anchor rod (11) at intervals along the axial direction of the anchor rod (11); The bottom end of the sleeve (13) is detachably connected to the top end of the anchor rod (11), and the top end is fixedly connected to the bottom end of the anchor tube (14), and the diameter of the anchor tube (14) is greater than the diameter of the anchor rod (11); The bottom end of the connecting pipe (15) is detachably connected to the top end of the anchor pipe (14), and the connecting plate (16) is fixedly arranged on the top end of the connecting pipe (15).

2. The variable-section assembled spiral anchor foundation according to claim 1, characterized in that: The sleeve (13) and the anchor rod (11) as well as the connecting pipe (15) and the anchor pipe (14) are plugged together.

3. The variable-section assembled spiral anchor foundation according to claim 2, characterized in that: It also includes a first connecting bolt (17) and a second connecting bolt (18); The anchor rod (11) and the sleeve (13) are both provided with a first connection hole and a second connection hole, and the axis of the first connection hole is perpendicular to the axis of the second connection hole; The first connecting bolt (17) passes through the first connecting holes on the sleeve (13) and the anchor rod (11) to connect the sleeve (13) and the anchor rod (11), and the second connecting bolt (18) passes through the second connecting holes on the sleeve (13) and the anchor rod (11) to connect the sleeve (13) and the anchor rod (11).

4. The variable-section assembled spiral anchor foundation according to claim 3, characterized in that: The anchor rod (11) is provided with a plurality of first connection holes and second connection holes, and the first connection holes and second connection holes are arranged at intervals along the axial direction of the anchor rod (11); The sleeve (13) is provided with a plurality of first connection holes and second connection holes, and the first connection holes and second connection holes are arranged at intervals along the axial direction of the sleeve (13); The distance between two adjacent first connection holes on the sleeve (13) is equal to the distance between two adjacent first connection holes on the anchor rod (11); The distance between two adjacent second connection holes on the sleeve (13) is equal to the distance between two adjacent second connection holes on the anchor rod (11).

5. The variable-section assembled spiral anchor foundation according to claim 2, characterized in that: Also includes a third connecting bolt (19) and a fourth connecting bolt (20); The anchor pipe (14) and the connecting pipe (15) are both provided with a third connecting hole and a fourth connecting hole, and the axis of the third connecting hole is perpendicular to the axis of the fourth connecting hole; The third connecting bolt (19) passes through the third connecting holes on the anchor pipe (14) and the connecting pipe (15) to connect the anchor pipe (14) and the connecting pipe (15), and the fourth connecting bolt (20) passes through the fourth connecting holes on the anchor pipe (14) and the connecting pipe (15) to connect the anchor pipe (14) and the connecting pipe (15).

6. The variable-section assembled spiral anchor foundation according to claim 5, characterized in that: The anchor pipe (14) is provided with a plurality of third connection holes and fourth connection holes, and the third connection holes are arranged at intervals along the axial direction of the anchor pipe (14); The third connecting hole and the fourth connecting hole are provided in plurality on the connecting pipe (15), and are arranged at intervals along the axial direction of the connecting pipe (15); The distance between two adjacent third connection holes on the connection pipe (15) is equal to the distance between two adjacent third connection holes on the anchor pipe (14); The distance between two adjacent fourth connection holes on the connection pipe (15) is equal to the distance between two adjacent fourth connection holes on the anchor pipe (14).

7. The variable-section assembled spiral anchor foundation according to any one of claims 1 to 6, characterized in that: It also comprises a fixing plate (21), which is arranged in the anchor pipe (14) and fixedly connected to the inner wall of the anchor pipe (14), the fixing plate (21) is perpendicular to the axis of the anchor pipe (14), and the top end of the sleeve (13) is fixedly connected to the fixing plate (21).

8. The variable-section assembled spiral anchor foundation according to claim 7, characterized in that: The fixing plate (21) is a cross-shaped plate, and the four plate ends (211) of the cross-shaped plate are fixedly connected to the inner wall of the anchor pipe (14).

9. The variable-section assembled spiral anchor foundation according to claim 8, characterized in that: It also comprises a sealing anchor plate (22), wherein the sealing anchor plate (22) is fixedly arranged at the bottom end of the anchor pipe (14) and is fixedly connected to the outer wall of the sleeve (13).

10. The variable-section assembled spiral anchor foundation according to any one of claims 1 to 6, characterized in that: The anchor pipe (14) comprises a coaxially arranged equal diameter section (141) and a variable diameter section (142); The bottom end of the equal diameter section (141) is fixedly connected to the top end of the variable diameter section (142), and the bottom end of the variable diameter section (142) is fixedly connected to the top end of the sleeve (13); The diameter of the top end of the variable diameter section (142) is equal to the diameter of the equal diameter section (141), and the diameter of the bottom end is equal to the diameter of the sleeve (13), and the diameter of the sleeve (13) is smaller than the diameter of the equal diameter section (141).

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