Screw anchor foundation general structure for power transmission line tower

Abstract

The utility model belongs to the technical field of power transmission engineering, and particularly relates to a universal structure of a spiral anchor foundation for a power transmission line tower. A screw anchor foundation universal structure for a power transmission line tower comprises three foundation anchor piles, a first anchor disc, a second anchor disc, a third anchor disc, a connecting plate, a foundation anchor pile head, a connecting component and a stiffening plate, wherein the first anchor disc, the second anchor disc and the third anchor disc are arranged on the body portions of the foundation anchor piles, the connecting plate is welded to the lower ends of the foundation anchor piles, the foundation anchor pile head is welded to the connecting plate, the connecting component is used for connecting the three foundation anchor piles, and the stiffening plate is arranged between the connecting component and the foundation anchor piles. By the adoption of the technical scheme, it can be avoided that connection conversion structures with many components are welded to the connecting component, and the connecting component is directly connected with the upper structure, so that the structure is simple, the force transmission path is clear, machining is easy, and field on-site installation is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of power transmission engineering, and in particular relates to a universal structure of a spiral anchor foundation for a power transmission line tower. Background Art

[0002] With the continuous development of the power industry and the accelerated advancement of power grid construction, mechanized construction has become an important path to achieve efficient, safe and sustainable development. In the construction of transmission line projects, spiral anchor foundations, as a foundation form of environmental protection, carbon reduction and mechanized construction, have gradually become the first choice. However, there are still some problems in the actual application of spiral anchor foundations: the applicable geological conditions are limited and cannot meet the foundation requirements of special soils such as gravel soil; the traditional spiral anchor foundation is insufficient in the horizontal force resistance of the single anchor foundation; the structure of the connection components between the upper structure and the spiral anchor is complex and difficult to locate. These problems restrict the widespread application of spiral anchor foundations and also limit the further mechanization and efficiency of transmission line projects. Therefore, it is necessary to propose a universal spiral anchor foundation structure that can solve different geological conditions, improve the horizontal force resistance of the single anchor foundation, and simplify the connection components between the upper structure and the spiral anchor to promote the mechanization development of transmission line construction. Utility Model Content

[0003] In view of the above problems, the utility model provides a universal structure of a spiral anchor foundation for a transmission line tower. The utility model can be applied to a wider range of soil conditions, especially gravel foundations where existing bolt anchor foundations cannot be implemented. The utility model can be successfully implemented under gravel foundation conditions.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A universal structure of a spiral anchor foundation for a transmission line tower, comprising three foundation anchor piles, a first anchor plate, a second anchor plate and a third anchor plate arranged on the body of the foundation anchor pile, a connecting plate welded to the lower end of the foundation anchor pile, a foundation anchor pile head welded to the connecting plate, a connecting member for the three foundation anchor piles, and a stiffening plate between the connecting member and the foundation anchor pile.

[0006] Furthermore, the third anchor plate is a three-layer anchor plate, the first anchor plate and the second anchor plate are two layers of anchor plates, the first anchor plate, the second anchor plate and the third anchor plate are arranged in sequence downward from the top of the base anchor pile, and the first anchor plate and the second anchor plate may be set according to calculation requirements, or may not be set, or one of them may be set.

[0007] Furthermore, the minimum outer diameter of the anchor plate at the bottom end of the third anchor plate is the outer diameter of the base anchor pile + 2 times the thickness of the anchor plate, the maximum outer diameter of the anchor plate at the upper end of the third anchor plate is the outer diameter of the base anchor pile + 2 cantilever widths, wherein the cantilever width can be determined according to calculations, the outer diameter of the anchor plate changes continuously in a spiral shape, the lead of the third anchor plate is 100-300mm, and the specific lead should be determined according to applicable geological conditions, and the vertical height of the third anchor plate is 1.5 times the lead; the outer diameters of the anchor plates of the first and second anchor plates are equal to the maximum outer diameter of the anchor plate at the upper end of the third anchor plate, the vertical heights of the first and second anchor plates are 1 times the lead, and the leads of the first and second anchor plates are the same as the third anchor plate.

[0008] Furthermore, the spacing between adjacent first anchor discs, second anchor discs and third anchor discs is 3 to 5 times of the maximum diameter of the anchor discs and is an integer multiple of the lead.

[0009] Furthermore, the structure type of the foundation anchor pile head arranged at the lower end of the foundation anchor pile can be determined according to the applicable geological conditions, and the structure type of the foundation anchor pile head can be a slope type, a solid cone type, and a steel plate welded quadrangular pyramid type.

[0010] In current engineering use, spiral anchors with equal outer diameter anchor plates + sloped anchor heads are suitable for silt, clay in a fluid plastic to hard plastic state, as well as special soil layers such as loess and soft soil. The present invention adds a structural type of spiral anchor, namely a spiral anchor plate + solid cone or steel plate welded four-sided pyramid anchor head spiral anchor. This type of spiral anchor is suitable for loose to medium-dense sand and gravel soil, which expands the applicable geological conditions range of the spiral anchor foundation, expands the applicable space of the spiral anchor foundation, and makes the spiral anchor foundation more widely applicable.

[0011] Furthermore, the foundation anchor piles are arranged with different or the same vertical inclination angles and different spatial azimuth angles according to calculations, and the upper ends of the three foundation anchor piles are connected together by connecting members to form a universal structure of a spiral anchor foundation for a single leg of a pole tower.

[0012] The above arrangement solves the problem that the single anchor pile foundation cannot meet the larger horizontal force requirements.

[0013] Furthermore, the three foundation anchor piles are connected to the connecting member by welding.

[0014] When the wall thickness of the foundation anchor pile is thick, the top can be grooved, and a combination of butt joint and fillet joints with partial penetration can be used. In addition, the connecting member is circular in shape, and the size of the hole opened on the connecting member to connect with the upper member is reserved for some margin, which is convenient for the installation and adjustment of the upper member.

[0015] By adopting the above technical solution, a connection conversion structure with a large number of welding components on the connection components can be avoided, and the connection components are directly connected to the upper structure. In this way, the structure is simple, the force transmission path is clear, it is easy to process, and it is convenient for field installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of a structural schematic diagram of a specific embodiment of the utility model.

[0017] Figure 2 It is a cross-sectional view of a structural schematic diagram of a specific embodiment of the utility model.

[0018] Figure 3 The utility model is a schematic diagram of a concrete embodiment of the anchor pile structure.

[0019] Figure 4 The utility model is a schematic diagram of the base anchor pile head structure of a specific embodiment of the present invention.

[0020] Figure 5 The utility model is a schematic diagram of the base anchor pile head structure of a specific embodiment of the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further explained below in conjunction with specific embodiments.

[0022] A universal structure of a spiral anchor foundation for a power transmission line tower, comprising three foundation anchor piles (4), a first anchor plate (1), a second anchor plate (2) and a third anchor plate (3) arranged on the body of the foundation anchor pile (4), a connecting plate (7) welded to the lower end of the foundation anchor pile (4), a foundation anchor pile head (5) welded to the connecting plate (7), a connecting member (6) of the three foundation anchor piles (4), and a stiffening plate (8) between the connecting member (6) and the foundation anchor pile (4).

[0023] Furthermore, the third anchor plate (3) is a three-layer anchor plate, the first anchor plate (1) and the second anchor plate (2) are two layers of anchor plates, the first anchor plate (1), the second anchor plate (2) and the third anchor plate (3) are arranged in sequence from the top of the anchor pile (4) downwards, and according to calculation requirements, the first anchor plate (1) and the second anchor plate (2) may be provided, or may not be provided, or one of them may be provided.

[0024] Furthermore, the minimum outer diameter of the anchor plate at the bottom end of the third anchor plate (3) is the outer diameter of the anchor pile + 2 times the thickness of the anchor plate, the maximum outer diameter of the anchor plate at the upper end of the third anchor plate (3) is the outer diameter of the anchor pile + 2 cantilever widths, wherein the cantilever width can be determined according to calculations, the outer diameter of the anchor plate changes continuously in a spiral shape, the lead of the third anchor plate (3) is 100-300 mm, the specific lead should be determined according to applicable geological conditions, and the vertical height of the third anchor plate (3) is 1.5 times the lead; the outer diameters of the anchor plates of the first anchor plate (1) and the second anchor plate (2) are equal to the maximum outer diameter of the anchor plate at the upper end of the third anchor plate (3), the vertical heights of the first anchor plate (1) and the second anchor plate (2) are 1 times the lead, and the leads of the first anchor plate (1) and the second anchor plate (2) are the same as those of the third anchor plate (3).

[0025] Furthermore, the spacing between adjacent first anchor discs (1), second anchor discs (2) and third anchor discs (3) is 3 to 5 times the maximum diameter of the anchor discs and is an integer multiple of the lead.

[0026] Furthermore, the structure type of the anchor pile head (5) arranged at the lower end of the anchor pile (4) can be determined according to applicable geological conditions, and the structure type of the anchor pile head (5) can be a slope type, a solid cone type, and a steel plate welded quadrangular pyramid type.

[0027] In current engineering use, spiral anchors with equal outer diameter anchor plates + sloped anchor heads are suitable for silt, clay in a fluid plastic to hard plastic state, as well as special soil layers such as loess and soft soil. The present invention adds a structural type of spiral anchor, namely a spiral anchor plate + solid cone or steel plate welded four-sided pyramid anchor head spiral anchor. This type of spiral anchor is suitable for loose to medium-dense sand and gravel soil, which expands the applicable geological conditions range of the spiral anchor foundation, expands the applicable space of the spiral anchor foundation, and makes the spiral anchor foundation more widely applicable.

[0028] Furthermore, the foundation anchor piles (4) are arranged with different or the same vertical inclination angles and different spatial azimuth angles according to calculations, and the upper ends of the three foundation anchor piles (4) are connected together by a connecting member (6) to form a universal structure of a spiral anchor foundation for a single leg of a pole tower.

[0029] The above arrangement solves the problem that the single anchor pile foundation cannot meet the larger horizontal force requirements.

[0030] Furthermore, the three foundation anchor piles (4) and the connecting member (6) are connected together by welding.

[0031] When the wall thickness of the anchor pile (4) is relatively thick, the top of the anchor pile (4) can be grooved, and a combination of a partially penetrated butt joint and a fillet joint weld can be used. In addition, the connecting member (6) is circular in shape, and a hole size opened on the connecting member (6) for connecting with the upper member is reserved with a partial margin, so that the upper member can be easily installed and adjusted.

[0032] By adopting the above technical solution, a connection conversion structure with a large number of welded components on the connection component (6) can be avoided, and the connection component (6) is directly connected to the upper structure. In this way, the structure is simple, the force transmission path is clear, it is easy to process, and it is convenient for field installation.

[0033] This structure can improve construction efficiency in engineering applications, avoid restrictions in the non-construction season, and reduce disturbances to the construction environment. It is a green, carbon-reducing, and environmentally friendly structural type.

Claims

1. A universal structure of a screw anchor foundation for a transmission line tower, characterized in that: It includes 3 foundation anchor piles, a first anchor plate, a second anchor plate and a third anchor plate arranged on the body of the foundation anchor pile, a connecting plate welded to the lower end of the foundation anchor pile, a foundation anchor pile head welded to the connecting plate, a connecting component of the 3 foundation anchor piles, and a stiffening plate between the connecting component and the foundation anchor pile.

2. A universal structure of a screw anchor foundation for a power transmission line tower as claimed in claim 1, characterized in that: The third anchor plate is a three-layer anchor plate, wherein the first anchor plate and the second anchor plate are two layers of anchor plates, and the first anchor plate, the second anchor plate and the third anchor plate are arranged in sequence downward from the top of the anchor pile.

3. A universal structure of a screw anchor foundation for a power transmission line tower as claimed in claim 1, characterized in that: The minimum outer diameter of the anchor plate at the bottom end of the third anchor plate is the outer diameter of the base anchor pile + 2 times the thickness of the anchor plate, the maximum outer diameter of the anchor plate at the upper end of the third anchor plate is the outer diameter of the base anchor pile + 2 cantilever widths, wherein the cantilever width can be determined according to calculations, the outer diameter of the anchor plate changes continuously in a spiral shape, the lead of the third anchor plate is 100-300mm, and the vertical height of the third anchor plate is 1.5 times the lead; the outer diameters of the anchor plates of the first and second anchor plates are equal to the maximum outer diameter of the anchor plate at the upper end of the third anchor plate, the vertical heights of the first and second anchor plates are 1 times the lead, and the leads of the first and second anchor plates are the same as the third anchor plate.

4. A universal structure of a screw anchor foundation for a power transmission line tower as claimed in claim 1, characterized in that: The spacing between the first anchor plate, the second anchor plate and the third anchor plate is 3 to 5 times of the maximum diameter of the anchor plate and is an integer multiple of the lead.

5. A universal structure of a screw anchor foundation for a power transmission line tower as claimed in claim 1, characterized in that: The anchor pile head arranged at the lower end of the anchor pile can have a slope type, a solid cone type, or a steel plate welded quadrangular pyramid type.

6. A universal structure of a screw anchor foundation for a power transmission line tower as claimed in claim 1, characterized in that: The upper ends of the anchor piles are connected together through connecting components to form a universal structure of a spiral anchor foundation for a single leg of a tower.

7. A universal structure of a screw anchor foundation for a power transmission line tower as claimed in claim 1, characterized in that: The three foundation anchor piles are connected to the connecting components by welding.

8. A universal structure of a screw anchor foundation for a power transmission line tower as claimed in claim 1, characterized in that: When the wall thickness of the foundation anchor pile is thick, the top can be beveled and a combination of partial penetration butt and fillet welds can be used.

9. A universal structure of a screw anchor foundation for a power transmission line tower as claimed in claim 1, characterized in that: The connecting member is circular in shape, and a hole opened on the connecting member for connection with the upper member has a size that reserves some margin, which facilitates installation and adjustment of the upper member.

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