Umbrella-shaped composite spiral anchor foundation

Abstract

The utility model discloses an umbrella type composite spiral anchor foundation which comprises a bearing platform, a center anchor rod and a plurality of auxiliary anchor rods, the center anchor rod is connected with the bearing platform, the auxiliary anchor rods are connected with the bearing platform, the auxiliary anchor rods are arranged at intervals in the circumferential direction of the center anchor rod, the diameter of the center anchor rod is larger than that of the auxiliary anchor rods, and the diameter of the center anchor rod is larger than that of the auxiliary anchor rods. And / or the length of the central anchor rod is greater than the diameter of the auxiliary anchor rod. The umbrella-shaped composite spiral anchor foundation has the advantages of being good in force transmission performance, good in pulling resistance of the tension side and good in pressure resistance of the compression side.

Description

Technical Field

[0001] The utility model relates to the technical field of power transmission line tower foundations, in particular to an umbrella-shaped composite spiral anchor foundation. Background Art

[0002] In the construction of high-voltage transmission lines, it is inevitable to pass through soft geological areas such as silt. In the past, the foundations of towers in such areas mostly adopted large plate foundations, pile foundations, cast foundations or gravity foundations. Although the safety of the transmission line is guaranteed, there are defects such as large material consumption, difficulty in excavation of foundation pits, large investment and long construction period. Although the related technology also uses spiral anchor foundations, the bearing capacity of ordinary spiral anchor foundations is insufficient. Generally, the anchor rod needs to be lengthened and the diameter of the spiral anchor plate needs to be increased. Due to the increase in the aspect ratio, the bending moment of the spiral anchor will increase, resulting in horizontal displacement, deflection or deformation of the spiral anchor, that is, there are defects of horizontal deformation and inclination deformation. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the utility model provides an umbrella-shaped composite spiral anchor foundation, which has the advantages of good force transmission, good pull-out resistance on the tension side and good compression resistance on the compression side.

[0005] According to the embodiment of the utility model, the umbrella-shaped composite spiral anchor foundation includes a base, a central anchor rod and an auxiliary anchor rod, wherein the central anchor rod is connected to the base; there are multiple auxiliary anchor rods and they are all connected to the base, and the multiple auxiliary anchor rods are arranged at intervals along the circumference of the central anchor rod, wherein the diameter of the central anchor rod is larger than the diameter of the auxiliary anchor rod, and / or the length of the central anchor rod is larger than the diameter of the auxiliary anchor rod.

[0006] According to the umbrella-shaped composite spiral anchor foundation of the embodiment of the utility model, a central anchor rod and a plurality of auxiliary anchor rods are provided, all of which are connected to the pedestal, and the three jointly meet the load-bearing requirements. Among them, the central anchor rod arranged in the middle, which is longer or has a larger diameter, bears the direct load transmitted by the pedestal, and the pedestal also distributes part of the load to the surrounding auxiliary anchor rods, and the umbrella-shaped composite spiral anchor foundation has good overall force transmission. At the same time, the plurality of auxiliary anchor rods distributed along the circumference of the central anchor rod can effectively play the role of pulling out the tension side and resisting compression on the compression side, so that the bending moment of the central anchor rod is smaller, and the umbrella-shaped composite spiral anchor foundation is less prone to horizontal deformation and inclination deformation.

[0007] In some embodiments, the support platform includes a central portion and a plurality of connecting arms, wherein the first ends of the plurality of connecting arms are connected to the central portion, and the plurality of connecting arms are distributed at intervals along the circumference of the central portion, wherein the central anchor rod is connected to the central portion, the auxiliary anchor rods correspond one-to-one to the connecting arms, and the auxiliary anchor rods are connected to the second ends of the corresponding connecting arms.

[0008] In some embodiments, the plurality of auxiliary anchor rods and the central anchor rod are parallel to each other.

[0009] In some embodiments, there are at least four auxiliary anchor rods and the auxiliary anchor rods are arranged at equal intervals along the circumference of the central anchor rod.

[0010] In some embodiments, a first corrugated pipe and a second corrugated pipe are pre-buried on the base, the upper end gap of the center anchor rod fits in the first corrugated pipe, the gap between the center anchor rod and the first corrugated pipe is filled with grouting, the second corrugated pipe corresponds to the auxiliary anchor rod one by one, the upper end gap of the auxiliary anchor rod fits in the second corrugated pipe, and the gap between the auxiliary anchor rod and the second corrugated pipe is filled with grouting.

[0011] In some embodiments, the central anchor rod and the auxiliary anchor rod have the same structure and both include a connecting tube and a reinforcing plate arranged on the outer circumferential surface of the connecting tube. The connecting tube and the reinforcing plate in the central anchor rod are both fitted in the first corrugated tube, and the connecting tube and the reinforcing plate in the auxiliary anchor rod are both fitted in the second corrugated tube.

[0012] In some embodiments, the central anchor rod and the auxiliary anchor rod also include an intermediate rod segment, a first sleeve, a tail rod segment and a second sleeve, the upper end of the intermediate rod segment and the lower end of the connecting tube are fitted in the first sleeve, the connecting tube is connected to the first sleeve via a threaded member, and the intermediate rod segment is connected to the first sleeve via a threaded member; the lower end of the tail rod segment is an inverted cone, the upper end of the tail rod segment and the lower end of the intermediate rod segment are fitted in the second sleeve, the intermediate rod segment is connected to the second sleeve via a threaded member, and the tail rod segment is connected to the second sleeve via a threaded member.

[0013] In some embodiments, a first transverse partition is provided on the inner circumference of the first sleeve, and the upper end of the middle rod segment and the lower end of the connecting tube are respectively abutted against the bottom and top surfaces of the first transverse partition; a second transverse partition is provided on the inner circumference of the second sleeve, and the upper end of the tail rod segment and the lower end of the middle rod segment are respectively abutted against the bottom and top surfaces of the second transverse partition.

[0014] In some embodiments, there are multiple intermediate rod segments, and any two adjacent intermediate rod segments are connected via the second sleeve and the threaded member, and the outer circumferences of the intermediate rod segments and the tail rod segments are welded with anchor plates extending in an axial spiral along the intermediate rod segments.

[0015] In some embodiments, the umbrella-shaped composite spiral anchor foundation further comprises a main column, the main column and the cap are integrally cast, and anchor bolts for connecting to the steel structure are pre-embedded on the main column. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an axonometric view of an umbrella-shaped composite spiral anchor foundation according to an embodiment of the utility model.

[0017] Figure 2 It is a front view of an umbrella-shaped composite spiral anchor foundation according to an embodiment of the utility model.

[0018] Figure 3 It is a top view of an umbrella-shaped composite spiral anchor foundation according to an embodiment of the utility model.

[0019] Reference numerals:

[0020] 1. Cap; 11. Center; 12. Connecting arm; 13. First bellows; 14. Second bellows; 2. Center anchor rod; 21. Connecting pipe; 22. Reinforcement plate; 23. Intermediate rod section; 24. Tail rod section; 25. First sleeve; 251. First transverse diaphragm; 26. Second sleeve; 261. Second transverse diaphragm; 27. Threaded part; 3. Auxiliary anchor rod; 4. Anchor plate; 5. Main column; 51. Anchor bolt. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0022] Combine the following Figure 1-Figure 3 The invention describes an umbrella-type composite spiral anchor foundation according to an embodiment of the invention.

[0023] The umbrella-shaped composite spiral anchor foundation according to the embodiment of the utility model comprises a cap 1, a central anchor rod 2 and an auxiliary anchor rod 3. The central anchor rod 2 is connected to the cap 1. There are multiple auxiliary anchor rods 3 and they are all connected to the cap 1. The multiple auxiliary anchor rods 3 are arranged at intervals along the circumference of the central anchor rod 2, wherein the diameter of the central anchor rod 2 is greater than the diameter of the auxiliary anchor rod 3, and / or the length of the central anchor rod 2 is greater than the diameter of the auxiliary anchor rod 3.

[0024] According to the umbrella-shaped composite spiral anchor foundation of the embodiment of the utility model, a central anchor rod 2 and a plurality of auxiliary anchor rods 3 are provided, all of which are connected to the pedestal 1, and the three jointly realize the load-bearing requirements. Among them, the central anchor rod 2 arranged in the middle, which is longer or has a larger diameter, bears the direct load transmitted by the pedestal 1, and the pedestal 1 also distributes part of the load to the surrounding auxiliary anchor rods 3, and the overall force transmission of the umbrella-shaped composite spiral anchor foundation is good. At the same time, the plurality of auxiliary anchor rods 3 distributed along the circumference of the central anchor rod 2 can effectively play the role of pulling out the tension side and resisting compression on the compression side, so that the bending moment of the central anchor rod 2 is smaller, and the umbrella-shaped composite spiral anchor foundation is less prone to horizontal deformation and inclination deformation.

[0025] It should be noted that Figure 1 and Figure 2 As shown, the central anchor rod 2 is arranged at the center position of the pedestal 1. On the basis of ensuring that the auxiliary anchor rod 3 can achieve the effects of pull-out resistance on the tensile side and compression resistance on the compressive side, the diameter of the central anchor rod 2 is set to be larger than the diameter of the auxiliary anchor rod 3, and the length of the central anchor rod 2 is set to be larger than the length of the auxiliary anchor rod 3, so as to effectively reduce the manufacturing cost of the umbrella-type composite spiral anchor foundation.

[0026] In some embodiments, Figure 3 As shown, the platform 1 includes a central portion 11 and a plurality of connecting arms 12, the first ends of the plurality of connecting arms 12 are all connected to the central portion 11, and the plurality of connecting arms 12 are spaced apart along the circumference of the central portion 11. The central anchor rod 2 is connected to the central portion 11, the auxiliary anchor rods 3 correspond to the connecting arms 12 one by one, and the auxiliary anchor rods 3 are connected to the second ends of the corresponding connecting arms 12.

[0027] That is, the cap 1 is an umbrella-shaped skeleton structure instead of a plate-shaped structure, so that the volume of the cap 1 is smaller, the amount of reinforced concrete required is less, and the engineering cost of the cap 1 is lower.

[0028] Specifically, each connecting arm 12 extends radially along the central portion 11. Therefore, when the length direction of the connecting arm 12 is constant, the distance between the auxiliary anchor rod 3 and the central anchor rod 2 is larger, the auxiliary anchor rod 3 has better pull-out resistance on the tensile side and better compression resistance on the compressive side, and the umbrella-type composite spiral anchor foundation has better self-balancing properties.

[0029] In some embodiments, Figure 1 and Figure 2 As shown, the plurality of auxiliary anchor rods 3 and the central anchor rod 2 are parallel to each other.

[0030] At this time, when the central anchor rod 2 and the plurality of auxiliary anchor rods 3 are driven into the soil, they will not radiate outward from the central anchor rod 2 as the center, but only need to be driven vertically downward into the soil, which has little destructive effect on underground appendages or vegetation.

[0031] In some embodiments, there are at least four auxiliary anchor rods 3 and they are arranged at equal intervals along the circumference of the central anchor rod 2 .

[0032] At least four auxiliary anchor rods 3 arranged at equal intervals along the circumference of the central anchor rod 2 have stronger force stability and better self-balancing effect.

[0033] Specifically, Figure 1 and Figure 2 As shown, there are four auxiliary anchor rods 3 which are arranged at equal intervals along the circumference of the central anchor rod 2.

[0034] In some embodiments, a first corrugated pipe 13 and a second corrugated pipe 14 are pre-buried on the base 1, the upper end gap of the center anchor rod 2 fits in the first corrugated pipe 13, the gap between the center anchor rod 2 and the first corrugated pipe 13 is filled with grouting material, the second corrugated pipe 14 corresponds to the auxiliary anchor rod 3 one by one, the upper end gap of the auxiliary anchor rod 3 fits in the second corrugated pipe 14, and the gap between the auxiliary anchor rod 3 and the second corrugated pipe 14 is filled with grouting material.

[0035] Therefore, after the cap 1 is cast, the upper end gap of the central anchor rod 2 is fitted in the first corrugated tube 13, and the gap between the central anchor rod 2 and the first corrugated tube 13 is filled with grouting material, and the central anchor rod 2 is reliably connected to the cap 1 when the grouting material solidifies. Similarly, the upper end gap of the auxiliary anchor rod 3 is fitted in the second corrugated tube 14, and the gap between the auxiliary anchor rod 3 and the second corrugated tube 14 is filled with grouting material, and the auxiliary anchor rod 3 is reliably connected to the cap 1 when the grouting material solidifies, thereby making it convenient to connect the central anchor rod 2 and the auxiliary anchor rod 3 to the cap 1, and having high connection strength.

[0036] Specifically, the inner cavities of the first bellows 13 and the second bellows 14 are opened on the top and bottom surfaces of the platform 1. Taking the connection between the center anchor rod 2 and the platform 1 as an example, the upper end of the center anchor rod 2 is engaged in the first bellows 13 through the lower end opening of the first bellows 13, and then the grouting material is filled into the first bellows 13 through the upper end opening of the first bellows 13 until the grouting material fills the space between the first bellows 13 and the center anchor rod 2, and the top surface of the platform 1 is smoothed.

[0037] In addition, the grouting material is fine stone concrete mortar, and the strength grade of the fine stone concrete mortar is greater than the strength grade of the concrete of the cap 1. For example, if C35 grade is used, the strength is greater than 45Mpa after 3 days. When the grouting material fills the first corrugated pipe 13 and the second corrugated pipe 14, it is necessary to vibrate and grout at the same time to ensure the compactness of the grouting part.

[0038] In some embodiments, Figure 1 and Figure 2As shown, the central anchor rod 2 and the auxiliary anchor rod 3 have the same structure and both include a connecting tube 21 and a reinforcing plate 22 arranged on the outer peripheral surface of the connecting tube 21. The connecting tube 21 and the reinforcing plate 22 in the central anchor rod 2 are both fitted in the first corrugated tube 13, and the connecting tube 21 and the reinforcing plate 22 in the auxiliary anchor rod 3 are both fitted in the second corrugated tube 14.

[0039] Taking the center anchor rod 2 as an example, at this time, the gap between the connecting pipe 21 and the first corrugated pipe 13 is larger, and the reinforcing plate 22 located in the gap effectively increases the contact area between the center anchor rod 2 and the grouting material, further ensuring the connection strength between the center anchor rod 2 and the base 1.

[0040] Specifically, the connecting pipe 21 is made of Q355 steel pipe, the inner diameter of the first corrugated pipe 13 is 1.5 to 2 times the outer diameter of the connecting pipe 21 of the center anchor 2, and there are multiple reinforcing plates 22 welded to the outer peripheral surface of the connecting pipe 21 at intervals along the circumference of the connecting pipe 21. The connecting pipe 21 is also filled with grouting material.

[0041] In some embodiments, Figure 1 and Figure 2 As shown, the central anchor rod 2 and the auxiliary anchor rod 3 also include an intermediate rod segment 23, a first sleeve 25, a tail rod segment 24 and a second sleeve 26. The upper end of the intermediate rod segment 23 and the lower end of the connecting pipe 21 are fitted in the first sleeve 25, the connecting pipe 21 is connected to the first sleeve 25 by a screw member 27, and the intermediate rod segment 23 is connected to the first sleeve 25 by a screw member 27. The lower end of the tail rod segment 24 is an inverted cone, the upper end of the tail rod segment 24 and the lower end of the intermediate rod segment 23 are fitted in the second sleeve 26, the intermediate rod segment 23 is connected to the second sleeve 26 by a screw member 27, and the tail rod segment 24 is connected to the second sleeve 26 by a screw member 27.

[0042] The inverted cone design at the lower end of the tail rod section 24 makes the operation of burying the central anchor rod 2 and the auxiliary anchor rod 3 more labor-saving and convenient. At the same time, the central anchor rod 2 and the auxiliary anchor rod 3 are designed as a detachable connecting pipe 21, an intermediate rod section 23 and a tail rod section 24, which facilitates the transportation of the central anchor rod 2 and the auxiliary anchor rod 3.

[0043] Specifically, after the lower end of the connecting tube 21 and the upper end of the intermediate rod segment 23 are fitted in the first sleeve 25, high-strength bolts are used to connect the first sleeve 25 with the connecting tube 21 and the intermediate rod segment 23. Similarly, the second sleeve 26 is also connected with the intermediate rod segment 23 and the tail rod segment 24 through high-strength bolts, thereby making the assembled central anchor rod 2 and auxiliary anchor rod 3 have higher structural strength and better anchoring performance.

[0044] In some embodiments, a first transverse partition 251 is provided on the inner circumference of the first sleeve 25, and the upper end of the middle rod segment 23 and the lower end of the connecting tube 21 are respectively abutted against the bottom and top surfaces of the first transverse partition 251; a second transverse partition 261 is provided on the inner circumference of the second sleeve 26, and the upper end of the tail rod segment 24 and the lower end of the middle rod segment 23 are respectively abutted against the bottom and top surfaces of the second transverse partition 261.

[0045] Under the action of the downward pressure of the connecting pipe 21, the bottom surface of the connecting pipe 21 contacts the first transverse diaphragm 251, which plays a supporting role and is also convenient for directly transferring the load to the middle rod segment 23. Similarly, under the action of the downward pressure of the middle rod segment 23, the bottom surface of the middle rod segment 23 contacts the second transverse diaphragm 261, which plays a supporting role and is also convenient for directly transferring the load to the middle rod segment 23 or the tail rod segment 24 below.

[0046] Specifically, the first transverse partition 251 is welded to the middle position of the first sleeve 25, and the second transverse partition 261 is welded to the middle position of the second sleeve 26. The thickness of the first transverse partition 251 is substantially equal to the wall thickness of the first sleeve 25, and the thickness of the second transverse partition 261 is substantially equal to the wall thickness of the second sleeve 26.

[0047] In some embodiments, Figure 1 and Figure 2 As shown, there are multiple intermediate rod segments 23, and any two adjacent intermediate rod segments 23 are connected by a second sleeve 26 and a threaded member 27. Thus, the central anchor rod 2 and the auxiliary anchor rod 3 can be separated into the intermediate rod segment 23 and the tail rod segment 24 with a smaller length, further improving the transportation convenience of the central anchor rod 2 and the auxiliary anchor rod 3.

[0048] The outer circumferences of the middle rod section 23 and the tail rod section 24 are welded with anchor pieces 4 extending spirally along the axial direction of the middle rod section 23. This makes the contact area between the umbrella-shaped composite spiral anchor foundation and the soil larger, the anchoring stability is stronger, and the self-stability is better.

[0049] In some embodiments, Figure 2 and Figure 3 As shown, the umbrella-shaped composite spiral anchor foundation also includes a main column 5, which is integrally cast with the cap 1, and a foundation bolt 51 for connecting with the steel structure is pre-embedded on the main column 5. The main column 5 is located directly above the center portion 11 of the cap 1, and is used to bear the load of the steel structure connected with the foundation bolt 51 and directly transfer the load to the center anchor rod 2 through the center portion 11.

[0050] The construction method of umbrella type composite spiral anchor foundation is as follows:

[0051] Step 1: Excavation of foundation pit: Use a large excavator to excavate the foundation pit to the bottom elevation of the cap 1.

[0052] Step 2: Position the spiral anchor and assemble the central anchor rod 2 and the auxiliary anchor rod 3.

[0053] Step 3: Drive the central anchor rod 2 and the auxiliary anchor rod 3 into the soil through the bottom of the foundation pit, and control the construction error of the central anchor rod 2 and the auxiliary anchor rod 3.

[0054] Step 4: The bottom surface of the foundation pit is leveled, and a cushion layer can be laid on the bottom surface of the foundation pit. The cushion layer should be leveled to ensure that the cap 1 fits tightly with the foundation.

[0055] Step 5: Lift the prefabricated cap 1 and main column 5 and hoist them into the foundation pit, so that the connecting pipe 21 enters the first corrugated pipe 13 and the second corrugated pipe 14 of the cap 1 until the cap 1 is placed on the cushion layer inside the foundation pit.

[0056] Step 6: Pour grouting material into the first corrugated pipe 13 and the second corrugated pipe 14, and pour grouting material into the connecting pipe 21, until the grouting material fills the space between the first corrugated pipe 13 / the second corrugated pipe 14 and the connecting pipe 21, and the space inside the connecting pipe 21, and smoothes the upper surface of the base 1.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0061] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0062] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. An umbrella-type composite spiral anchor foundation, characterized in that: include: platform; A central anchor rod, the central anchor rod being connected to the cap; and Auxiliary anchor rods, there are multiple auxiliary anchor rods and all are connected to the cap, and the multiple auxiliary anchor rods are arranged at intervals along the circumference of the central anchor rod, wherein: The diameter of the central anchor rod is greater than the diameter of the auxiliary anchor rod, and / or the length of the central anchor rod is greater than the diameter of the auxiliary anchor rod.

2. The umbrella-type composite spiral anchor foundation according to claim 1, characterized in that: The platform comprises a central portion and a plurality of connecting arms, wherein the first ends of the plurality of connecting arms are connected to the central portion, and the plurality of connecting arms are spaced apart along the circumference of the central portion, wherein: The central anchor rod is connected to the central portion, the auxiliary anchor rods correspond to the connecting arms one by one, and the auxiliary anchor rods are connected to the second ends of the corresponding connecting arms.

3. The umbrella-type composite spiral anchor foundation according to claim 1, characterized in that: The plurality of auxiliary anchor rods and the central anchor rod are parallel to each other.

4. The umbrella-type composite spiral anchor foundation according to claim 1, characterized in that: There are at least four auxiliary anchor rods, which are arranged at equal intervals along the circumference of the central anchor rod.

5. The umbrella-type composite spiral anchor foundation according to claim 1, characterized in that: A first corrugated pipe and a second corrugated pipe are pre-buried on the base, the upper end gap of the central anchor rod fits in the first corrugated pipe, the gap between the central anchor rod and the first corrugated pipe is filled with grouting material, the second corrugated pipe corresponds to the auxiliary anchor rod one by one, the upper end gap of the auxiliary anchor rod fits in the second corrugated pipe, and the gap between the auxiliary anchor rod and the second corrugated pipe is filled with grouting material.

6. The umbrella-type composite spiral anchor foundation according to claim 5, characterized in that: The central anchor rod and the auxiliary anchor rod have the same structure and both include a connecting tube and a reinforcing plate arranged on the outer circumferential surface of the connecting tube. The connecting tube and the reinforcing plate in the central anchor rod are both fitted in the first corrugated tube, and the connecting tube and the reinforcing plate in the auxiliary anchor rod are both fitted in the second corrugated tube.

7. The umbrella-type composite spiral anchor foundation according to claim 6, characterized in that: The central anchor rod and the auxiliary anchor rod also include: an intermediate rod section and a first sleeve, wherein the upper end of the intermediate rod section and the lower end of the connecting pipe fit into the first sleeve, the connecting pipe is connected to the first sleeve via a threaded member, and the intermediate rod section is connected to the first sleeve via a threaded member; and A tail rod segment and a second sleeve, wherein the lower end of the tail rod segment is an inverted cone, the upper end of the tail rod segment and the lower end of the middle rod segment fit in the second sleeve, the middle rod segment is connected to the second sleeve via a threaded member, and the tail rod segment is connected to the second sleeve via a threaded member.

8. The umbrella-type composite spiral anchor foundation according to claim 7, characterized in that: A first transverse partition is provided on the inner circumference of the first sleeve, and the upper end of the middle rod segment and the lower end of the connecting pipe are respectively abutted against the bottom and top surfaces of the first transverse partition; a second transverse partition is provided on the inner circumference of the second sleeve, and the upper end of the tail rod segment and the lower end of the middle rod segment are respectively abutted against the bottom and top surfaces of the second transverse partition.

9. The umbrella-type composite spiral anchor foundation according to claim 7, characterized in that: There are multiple intermediate rod segments, and any two adjacent intermediate rod segments are connected via the second sleeve and the threaded member. Anchor plates extending in a spiral along the axial direction of the intermediate rod segment are welded to the outer circumferences of the intermediate rod segment and the tail rod segment.

10. The umbrella-type composite spiral anchor foundation according to claim 1, characterized in that: The umbrella-shaped composite spiral anchor foundation also includes a main column, which is integrally cast with the cap, and anchor bolts for connecting with steel structural members are pre-embedded on the main column.

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