CN220099883U - Screw anchor foundation - Google Patents

Abstract

The utility model relates to a spiral anchor foundation, which comprises an anchor rod, a spiral anchor disc and a steel tube, wherein the spiral anchor disc is arranged on the outer circumferential surface of the anchor rod, the steel tube is provided with a top, a bottom and a side surface, the side surface is connected with the top and the bottom, the bottom is connected with one end of the anchor rod, the bottom, the top and the side surface define a cavity, the cavity is suitable for being filled with concrete, the bottom is provided with a through hole penetrating through the bottom along the up-down direction, the through hole is communicated with the cavity, in a projection plane orthogonal to the axis of the anchor rod, the projection of the anchor rod is positioned in the projection of the bottom of the steel tube, and the through hole is positioned on the outer circumferential side of the anchor rod. The utility model has the advantages of simple structure, low cost, high bearing capacity and the like.

Description

Screw anchor foundation

Technical Field

The utility model relates to the field of constructional engineering, in particular to a screw anchor foundation.

Background

The screw anchor, also called screw pile, is an artificially manufactured steel foundation, which is composed of anchor rod, anchor disc or anchor blade, anchor plate, anchor head, etc. by applying torque on the top of the anchor rod, the screw anchor disc and anchor rod are screwed into deeper soil layer with holding force, and the inherent strength of deep undisturbed soil body can be fully exerted.

In the related art, the spiral anchor foundation has low construction efficiency, low bearing capacity and higher construction cost.

Disclosure of Invention

The present utility model has been made based on the findings and knowledge of the inventors regarding the following facts and problems:

in the related art, when the bearing capacity of the foundation of the screw anchor is insufficient, the anchor rod is required to be lengthened, the diameter of the screw anchor disc is increased, and the bending moment borne by the screw anchor is increased due to the increase of the length-diameter ratio, so that the screw anchor is horizontally displaced, deflected or deformed, and horizontal deformation and inclination deformation are caused. If the diameter and the wall thickness of the anchor rod are increased, the capacity of bearing the horizontal force of the screw anchor can be improved, but the cost is greatly increased, and the difficulty of transportation and construction is increased. If the number of the anchor rods is increased, the cost is increased and the material is wasted.

In order to increase the problem of insufficient horizontal bearing capacity of a common screw anchor foundation, some experts propose a mode of compounding a pile foundation or a plate foundation with a screw anchor foundation. The construction method has the following problems: (1) The two times of excavation are needed, concrete is also needed to be poured, the working procedure is complex, the construction period is longer, the disturbance degree of the excavation to the soil is larger, and the deformation resistance capability of the soil is reduced. (2) The construction method has the advantages that a plurality of screw anchors are required to be arranged, so that the cost is high, the construction period is long, and the inclined screw anchors radiate to the periphery by taking the vertical screw anchors as the center, so that the damage to low-level accessories or vegetation is large. (3) Because screw anchors are mostly suitable for areas with weak geology, the transportation of assembled concrete causes great problems and causes the waste of cost.

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the utility model provides the screw anchor foundation with high construction efficiency, high safety, low cost and strong bearing capacity.

The screw anchor foundation according to an embodiment of the present utility model includes: a bolt; the spiral anchor disc is arranged on the outer circumferential surface of the anchor rod; the steel pipe, the steel pipe has top, bottom and side, the side is connected top and bottom, the bottom with the one end of stock links to each other, the bottom the top with the cavity is prescribe a limit to the side, the cavity is suitable for letting in concrete, the bottom is equipped with the through-hole that runs through the bottom along the upper and lower direction, the through-hole with the cavity intercommunication, in the projection plane of the axis of quadrature in the stock, the projection of stock is located in the projection of the bottom of steel pipe, the through-hole is located the periphery side of stock.

According to the spiral anchor foundation provided by the embodiment of the utility model, the anchor rods, the spiral anchor disc and the steel pipes are arranged, so that the rigidity of the spiral anchor foundation and the contact area between the whole spiral anchor foundation and soil are increased, the bearing capacity of the spiral anchor foundation is improved, and the processing and manufacturing cost of the spiral anchor foundation is reduced.

In some embodiments, the through holes are multiple, the through holes are arranged at the bottom of the steel pipe at intervals along the circumferential direction of the steel pipe, and the through holes and the outer circumferential surface of the anchor rod are arranged at intervals along the inner and outer directions.

In some embodiments, the screw anchor foundation further comprises a mounting barrel, the anchor rod comprises a first section and a second section which are connected in sequence, one part of the mounting barrel is sleeved at the end part of the first section adjacent to the second section, the other part of the mounting barrel is sleeved at the end part of the second section adjacent to the first section, and the mounting barrel is respectively connected with the first section and the second section through fasteners.

In some embodiments, the screw anchor foundation further comprises a first flange and a second flange, the first flange is disposed at one end of the anchor rod adjacent to the steel pipe, the second flange is disposed at the bottom of the steel pipe, and the first flange and the second flange are connected by a fastener, so that the anchor rod and the steel pipe are detachably connected.

In some embodiments, the screw anchor foundation further comprises a first stiffening plate, the first stiffening plate is arranged on one side, away from the steel pipe, of the first flange, one end of the first stiffening plate is connected with the first flange, and one side of the first stiffening plate is connected with the outer circumferential surface of the anchor rod.

In some embodiments, the free end of the anchor rod extends radially of the anchor rod and is inclined away from the steel tube.

In some embodiments, the helical anchor disc is a plurality of the helical anchor discs spaced axially along the bolt.

In some embodiments, the screw anchor foundation further comprises a toe plate and a second stiffening plate, the toe plate is arranged at the top of the steel pipe, the second stiffening plate is arranged at one side of the toe plate adjacent to the steel pipe, one end of the second stiffening plate is connected with the toe plate, and one side of the second stiffening plate is connected with the outer peripheral surface of the steel pipe.

In some embodiments, the steel tube is cylindrical, and an axial direction of the steel tube intersects a length direction of the tower foot plate to form an included angle.

In some embodiments, the diameter of the steel tube is greater than 2 times the diameter of the anchor.

Drawings

Fig. 1 is a schematic structural view of a screw anchor foundation according to a first embodiment of the present utility model.

Fig. 2 is a schematic structural view of a screw anchor foundation according to a second embodiment of the present utility model.

Fig. 3 is a schematic view of the structure of the bottom of a steel tube of a screw anchor foundation according to an embodiment of the present utility model.

Fig. 4 is a schematic view of the installation of the first and second sections of the screw anchor foundation of an embodiment of the present utility model.

A screw anchor foundation 100;

a bolt 1; a first section 11; a second section 12;

a spiral anchor disc 2;

a steel pipe 3; a through hole 31; a first flange 4; a second flange 5; a first stiffening plate 6; a tower foot plate 7; a second stiffening plate 8; and a mounting cylinder 9.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

A screw anchor foundation according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1 to 4, a screw anchor foundation 100 according to an embodiment of the present utility model includes a shank 1, a screw anchor disc 2, and a steel pipe 3.

The spiral anchor disc 2 is arranged on the outer circumferential surface of the anchor rod 1. Specifically, as shown in fig. 1-2, the anchor rod 1 is a circular tube, the anchor rod 1 extends in the up-down direction, and the spiral anchor disc 2 is spirally fixed on the outer circumferential surface of the anchor rod 1 in the up-down direction.

The steel pipe 3 has a top, a bottom and a side surface, the side surface connects the top and the bottom, the bottom is connected with one end of the anchor rod 1, the bottom, the top and the side surface define a cavity, the cavity is suitable for being filled with concrete, the bottom is provided with a through hole 31 penetrating the bottom along the up-down direction, the through hole 31 is communicated with the cavity, in a projection plane orthogonal to the axis of the anchor rod 1, the projection of the anchor rod 1 is positioned in the projection of the bottom of the steel pipe 3, and the through hole 31 is positioned on the outer circumference side of the anchor rod 1. Specifically, as shown in fig. 1-2, the steel tube 3 extends along the up-down direction, the bottom of the steel tube 3 is connected with the upper end of the anchor rod 1, a cavity extending along the up-down direction is arranged in the steel tube 3, the cross section area of the steel tube 3 in the up-down direction is larger than that of the anchor rod 1, so that a structure with a variable cross section from top to bottom is formed, the bottom of the steel tube 3 is provided with a through hole 31 penetrating the bottom of the steel tube 3 along the up-down direction, the through hole 31 is communicated with the cavity, the through hole 31 is positioned on the outer peripheral side of the anchor rod 1, the steel tube 3 is connected with a driving member, the driving machine drives the steel tube 3 to rotate, the steel tube 3 drives the anchor rod 1 to rotate, at least part of the steel tube 3, the spiral anchor disc 2 and the anchor rod 1 are screwed into soil together, and the strength of the soil body structure is fully utilized, so that construction is guaranteed to be smoothly carried out, when the stress of a tower is larger, C30 concrete can be poured into the cavity of the steel tube 3 to form the concrete section, the lifting of the member is improved in a part, and the horizontal bearing capacity of the screw anchor foundation 100 is improved.

Compared with the prior art, when the bearing capacity of the screw anchor foundation is insufficient, the screw anchor foundation 100 provided by the embodiment of the utility model is provided with the anchor rods 1, the screw anchor discs 2 and the steel pipes 3, the anchor rods 1 are not required to be lengthened, the diameters of the screw anchor discs 2 are not required to be increased, the number of screw anchors is not required to be increased, the steel pipes 3 are only screwed into soil or concrete is poured into the steel pipes 3, so that the bearing capacity of the screw anchor foundation 100 can be improved, the processing and manufacturing cost of the screw anchor foundation 100 is reduced, and the through holes 31 are additionally provided, and when the screw anchor foundation is constructed, residual soil can enter the steel pipes 3 through the through holes 31 and be discharged, so that the disturbance degree of the whole structure to soil is greatly reduced, the secondary excavation is reduced, the strength of the soil is effectively utilized, and the bearing capacity of the screw anchor foundation 100 is further improved.

The spiral anchor foundation 100 of the embodiment of the utility model is applied to the fields of building engineering (such as steel structures and the like), power engineering (transformer stations, transmission lines and the like) communication towers and the like, and particularly the ultra-high voltage transmission towers inevitably pass through weak geological areas such as silt and the like, the ultra-high voltage transmission towers have the characteristics of high stress and the like, the steel pipe 3 composite spiral anchor foundation 100 is completely suitable for the technical characteristics of ultra-high voltage, and the characteristics of saving material cost, reducing soil disturbance and being environment-friendly and the like.

In some embodiments, the through holes 31 are plural, the plural through holes 31 are disposed at intervals along the circumferential direction of the steel pipe 3 at the bottom of the steel pipe 3, and the plural through holes 31 are disposed at intervals along the inner and outer directions with the outer circumferential surface of the anchor rod 1. Specifically, as shown in fig. 3, the through holes 31 may be provided in plural and at equal intervals along the circumferential direction of the anchor rod 1, and the outline of the inner circumferential surface of the through holes 31 is rectangular, whereby the disturbance degree of the steel pipe 3 to the soil is further reduced by the plural through holes 31.

In some embodiments, the screw anchor foundation 100 further comprises a mounting cylinder 9, the anchor rod 1 comprises a first section 11 and a second section 12 which are connected in sequence, one part of the mounting cylinder 9 is sleeved at the end of the first section 11 adjacent to the second section 12, the other part of the mounting cylinder 9 is sleeved at the end of the second section 12 adjacent to the first section 11, and the mounting cylinder 9 is respectively connected with the first section 11 and the second section 12 through fasteners. Specifically, as shown in fig. 1-4, the first section 11 is an extension anchor rod 1, the second section 12 is a main anchor rod 1, the first section 11 is arranged above the second section 12, the upper end of the first section 11 is connected with the bottom of the mounting cylinder 9, the lower end of the first section 11 is sleeved at the upper end of the mounting cylinder 9, the upper end of the second section 12 is sleeved at the lower end of the mounting cylinder 9, the lower end of the first section 11 is provided with a first mounting hole penetrating the first section 11 along the inner and outer direction, the upper end of the second section 12 is provided with a second mounting hole penetrating the second section 12 along the inner and outer direction, the mounting cylinder 9 is provided with a third mounting hole opposite to the first mounting hole and the second mounting hole along the inner and outer direction, or the fastener is arranged in the second mounting hole and the third mounting hole in a penetrating way, so that the first section 11 and the second section 12 are connected with each other through the mounting cylinder 9, the second section 12 is a guide function of ensuring the member screwing into soil and a main stressed member of a composite screw anchor, and the first anchor rod is provided with a long anchor rod 1, and the cost of the spiral anchor rod is reduced when the spiral anchor rod is manufactured, and the cost is increased, and the cost of the anchor rod is increased, and the anchor rod is required to be 1, and the cost is increased.

In some embodiments, the screw anchor foundation 100 further includes a first flange 4 and a second flange 5, the first flange 4 being provided at an end of the anchor rod 1 adjacent to the steel pipe 3, the second flange 5 being provided at a bottom of the steel pipe 3, the first flange 4 and the second flange 5 being connected by a fastener so that the anchor rod 1 and the steel pipe 3 are detachably connected. Specifically, as shown in fig. 1-2, the upper end of the anchor rod 1 is provided with a first flange 4, the bottom of the steel tube 3 is provided with a second flange 5, and the first flange 4 and the second flange 5 are connected through fasteners, so that the anchor rod 1 and the steel tube 3 are detachably connected through the first flange 4 and the second flange 5.

In some embodiments, the screw anchor foundation 100 further includes a first stiffening plate 6, the first stiffening plate 6 is disposed on a side of the first flange 4 away from the steel pipe 3, one end of the first stiffening plate 6 is connected to the first flange 4, and one side of the first stiffening plate 6 is connected to the outer circumferential surface of the anchor rod 1. Specifically, as shown in fig. 1-2, a plurality of first stiffening plates 6 are arranged at the lower end of the first flange 4 at equal intervals along the circumferential direction of the anchor rod 1, the upper end of the first stiffening plate 6 is welded with the lower end face of the first flange 4, and one side of the first stiffening plate 6 is welded with the outer circumferential surface of the anchor rod 1, so that the rigidity of the first flange 4 is improved through the first stiffening plate 6, and the bearing capacity of the spiral anchor foundation 100 is improved.

In some embodiments, the free end of the anchor rod 1 extends in the radial direction of the anchor rod 1 and is inclined in a direction away from the steel tube 3. Specifically, as shown in fig. 1-2, the lower end surface of the anchor rod 1 extends from left to right and inclines from top to bottom, so that the efficiency of screwing the anchor rod 1 into soil is improved.

In some embodiments, the number of helical anchor discs 2 is plural, with the plurality of helical anchor discs 2 being spaced axially along the bolt 1. Specifically, as shown in fig. 1-2, a plurality of screw anchor discs 2 are spirally provided on the outer circumferential surface of the anchor rod 1 at equal intervals in the up-down direction, thereby further improving the bearing capacity of the screw anchor foundation 100 in the up-down direction.

In some embodiments, the direction of extension of the through hole 31 is uniform along the spiral direction of the spiral anchor disc 2. Because the rotation direction of the anchor rod 1 is identical to the spiral direction of the spiral disc when the anchor rod 1 is screwed into the ground, the extension direction of the through hole 31 is identical to the spiral direction of the spiral anchor disc 2, and when the steel pipe 3 is screwed into the ground, the redundant ground can conveniently flow into the cavity, so that the installation cost of the spiral anchor foundation 100 is reduced.

In some embodiments, the screw anchor foundation 100 further includes a toe plate 7 and a second stiffening plate 8, the toe plate 7 is disposed on top of the steel pipe 3, the second stiffening plate 8 is disposed on a side of the toe plate 7 adjacent to the steel pipe 3, one end of the second stiffening plate 8 is connected to the toe plate 7, and one side of the second stiffening plate 8 is connected to an outer circumferential surface of the steel pipe 3. Specifically, as shown in fig. 1-2, the tower foot plate 7 is arranged at the top of the steel pipe 3, the tower foot plate 7 is connected with the iron tower through foundation bolts, so that an installation foundation is provided for the iron tower, the second stiffening plates 8 are arranged below the tower foot plate 7 at equal intervals along the circumferential direction of the steel pipe 3, the upper ends of the second stiffening plates 8 are welded with the lower end faces of the second stiffening plates 8, one sides of the second stiffening plates 8 are welded with the outer circumferential faces of the steel pipe 3, and therefore, the rigidity of the tower foot plate 7 is improved through the second stiffening plates 8, and the bearing capacity of the steel pipe 3 is improved.

In some embodiments, the steel tube 3 is cylindrical, and the axial direction of the steel tube 3 intersects the length direction (the inner and outer directions as shown in fig. 1) of the tower foot plate 7 at an angle. Specifically, because the connection modes of the iron tower and the screw anchor foundation 100 are different, the steel pipe 3 can be set according to actual situations, as shown in fig. 1, when the iron tower and the foundation are connected by adopting straight foundation bolts, the axial direction of the steel pipe 3 is orthogonal to the length direction of the tower foot plate 7, as shown in fig. 2, if the tower leg is directly penetrated into the screw anchor foundation 100 by adopting the inserted angle steel, the included angle between the axial direction of the steel pipe 3 and the horizontal direction is smaller than 90 °.

In some embodiments, the diameter of the steel tube 3 is greater than 2 times the diameter of the bolt 1. Thereby, the rigidity of the screw anchor foundation 100 and the contact area of the whole member with the soil are greatly increased, so that the horizontal bearing capacity is greatly improved.

The main setting parameters of the screw anchor foundation 100 of the embodiment of the present utility model are as follows:

the diameter of the anchor rod 1 is 180mm, and the diameter of the steel pipe 3 is 450mm. The steel pipe 3 is connected with the first section 11 by adopting a first flange 4 and a second flange 5, wherein the steel pipe 3 and the first section 11 are respectively welded with the first flange 4 and the second flange 5, and the first flange 4 and the second flange 5 are connected by adopting high-strength bolts (8.8 grade); in order to ensure the rigidity of the flange, a first stiffening plate 6 is arranged, and two ends of the first stiffening plate 6 are respectively welded with the steel pipe 3 (or the extension anchor rod 1) and the flange.

The outer diameter of the first flange 4 is 900mm (the thickness is 20 mm), and the size of the first stiffening plate 6 is 200mm (the thickness is 8 mm).

The helical anchor disc 2 on the second section 12 is 1000mm from the end bevelled section. The diameter of the mounting cylinder 9 is 200mm and the thickness is 10mm.

The materials of the first section 11, the second section 12 and the spiral anchor disc 2 are Q345.

During construction, the screw anchor disc 2 arranged on the first section 11 and the second section 12 ensures the screw-in of the integral component, so that the screw anchor foundation 100 is easier to drill into the soil. Under the action of the spiral anchor disc 2, soil can enter the steel pipe 3 through the through holes 31, and therefore, the utility model greatly reduces the disturbance of the integral structure to the soil, fully exerts the strength of the soil, improves the bearing capacity of the components, does not need secondary excavation, and improves the construction efficiency. In addition, the soil entering the steel pipe 3 can improve the strength of the steel pipe 3, and the wall thickness of the steel pipe 3 can be reduced to some extent, thereby reducing the cost of the screw anchor foundation 100. After the construction is finished, the diameter of the steel pipe 3 is larger than that of the anchor rod 1, so that the lateral rigidity of the screw anchor and the contact area between the screw anchor and a foundation are increased, and the bearing capacity level of the screw anchor is increased.

When the spiral anchor rod 1 is constructed, the soil body is discharged completely, and the through hole 31 is plugged. And (3) pouring the concrete with the strength grade of C35 into the steel pipe 3 to form the steel pipe 3 concrete composite screw anchor foundation 100, so that the lateral rigidity of the screw anchor is further improved, and the wall thickness of the light pipe can be reduced. The construction cost is reduced, and the bearing capacity level of the screw anchor is improved.

In summary, compared with the related art, the spiral anchor rod 1 has the following basic advantages:

the diameter of the steel pipe 3 is larger than that of the anchor rod 1, so that the rigidity of the spiral anchor rod 1 and the contact area of the whole component and soil are greatly increased, and the horizontal bearing capacity of the spiral anchor rod 1 is greatly improved;

and secondly, C30 concrete can be poured into the steel pipe 3 to form steel pipe 3 concrete according to the requirement of the stress condition of the tower, so that the rigidity and the horizontal bearing capacity of the component are further improved.

And (III) during construction, under the action of the spiral anchor disc 2 below the steel pipe 3, residual soil can enter the steel pipe 3 through a soil outlet reserved on the flange plate and is discharged, so that the disturbance degree of the whole component to the soil is greatly reduced, secondary excavation is reduced, the strength of the soil body is effectively utilized, and the bearing capacity of the spiral anchor foundation 100 is improved.

And fourthly, for towers with larger stress, the diameter of the anchor rod 1 is not required to be increased, and the bearing capacity can be ensured only by the fact that the burial depth of the steel pipe 3 is larger than the depth of the frozen soil layer, so that the manufacturing cost of the spiral anchor rod 1 is reduced.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed 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. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. A screw anchor foundation comprising: a bolt; the spiral anchor disc is arranged on the outer circumferential surface of the anchor rod; the steel pipe, the steel pipe has top, bottom and side, the side is connected top and bottom, the bottom with the one end of stock links to each other, the bottom the top with the cavity is prescribe a limit to the side, the cavity is suitable for letting in concrete, the bottom is equipped with the through-hole that runs through the bottom along the upper and lower direction, the through-hole with the cavity intercommunication, in the projection plane of the axis of quadrature in the stock, the projection of stock is located in the projection of the bottom of steel pipe, the through-hole is located the periphery side of stock.

2. The screw anchor foundation according to claim 1, wherein the number of through holes is plural, the plural through holes are provided at intervals along the circumferential direction of the steel pipe at the bottom of the steel pipe, and the plural through holes are provided at intervals along the inner and outer directions with the outer circumferential surface of the anchor rod.

3. The screw anchor foundation of claim 1, further comprising a mounting barrel, wherein the anchor shaft comprises a first section and a second section connected in sequence, wherein a portion of the mounting barrel is sleeved at an end of the first section adjacent to the second section, and another portion of the mounting barrel is sleeved at an end of the second section adjacent to the first section, and wherein the mounting barrel is connected to the first section and the second section by fasteners, respectively.

4. The screw anchor foundation of claim 1, further comprising a first flange and a second flange, the first flange being disposed at an end of the anchor rod adjacent the steel pipe, the second flange being disposed at a bottom of the steel pipe, the first flange and the second flange being connected by a fastener so that the anchor rod and the steel pipe are detachably connected.

5. The screw anchor foundation of claim 4, further comprising a first stiffening plate disposed on a side of the first flange remote from the steel tube, wherein one end of the first stiffening plate is connected to the first flange, and wherein one side of the first stiffening plate is connected to the outer circumferential surface of the anchor shaft.

6. A screw anchor foundation according to claim 1, wherein the free end of the shank extends radially of the shank and is inclined away from the steel tube.

7. The screw anchor foundation of claim 1, wherein the screw anchor discs are a plurality of, a plurality of the screw anchor discs being spaced apart along the axial direction of the shank.

8. The screw anchor foundation of any one of claims 1-7, further comprising a toe plate and a second stiffening plate, the toe plate being disposed on top of the steel pipe, the second stiffening plate being disposed on a side of the toe plate adjacent the steel pipe, one end of the second stiffening plate being connected to the toe plate, one side of the second stiffening plate being connected to an outer peripheral surface of the steel pipe.

9. The screw anchor foundation of claim 8, wherein the steel tube is cylindrical, and the axial direction of the steel tube intersects the length direction of the toe plate at an angle.

10. The screw anchor foundation of claim 1, wherein the diameter of the steel tube is greater than 2 times the diameter of the anchor shaft.