Prefabricated foundation and power transmission line tower

Abstract

The application relates to the technical field of building construction, and discloses a fabricated foundation and a power transmission line tower, wherein the fabricated foundation comprises a base, a supporting column, a first connecting piece, a second connecting piece and fixing bolts. The supporting column is vertically arranged on the base and used for fixing the power transmission line tower; the first connecting piece is sleeved at the bottom of the supporting column and fixedly connected with the supporting column, and a plurality of mounting holes are arranged on the first connecting piece; the second connecting piece is pre-buried in the base, the second connecting piece has at least one extension section extending upwards to the top end of the base, each extension section has a connecting screw hole extending in the up-down direction; the fixing bolts are provided in plurality, the plurality of fixing bolts correspond to the connecting screw holes one by one, the lower parts of the fixing bolts are arranged in the connecting screw holes, and the upper ends of the fixing bolts pass through the mounting holes. The application solves the technical problem that in the prior art, when a cast-in-place concrete slab column foundation is constructed, it is difficult to realize continuous and stable water and electricity supply in remote areas, thereby causing difficulties in foundation construction.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a prefabricated foundation and a power transmission line tower. Background Technology

[0002] Transmission line towers are key supporting components for overhead conductors, ensuring the long-distance transmission of electricity. The safety and durability of their foundations are fundamental to ensuring the long-term stable operation of the power grid. Currently, cast-in-place concrete slab-column foundations are commonly used for transmission line towers in high-voltage and ultra-high-voltage transmission projects both domestically and internationally.

[0003] A cast-in-place concrete slab-column foundation consists of a concrete base and supporting columns fixed to the top of the concrete base. During the construction of the cast-in-place concrete slab-column foundation, the concrete base and supporting columns are cast as a single unit. First, the foundation pit is excavated at the predetermined tower location of the transmission line tower. Then, steel bars are tied, formwork is erected, and concrete is poured in the foundation pit. After the concrete is poured, it is cured (usually for 28 days). After the concrete strength has increased to the design value, the transmission line tower is fixedly installed on the foundation.

[0004] In the aforementioned construction process of cast-in-place concrete foundations, the mixing, pouring, and curing of concrete require a large amount of water, while the mixing of the mixer and the vibration of the compaction device also require a continuous and stable power supply. However, in remote areas such as mountainous regions and deserts, hydropower resources are scarce, making it difficult to achieve a continuous and stable power supply, which cannot meet the construction conditions for cast-in-place concrete foundations, thus making foundation construction difficult. Moreover, the aforementioned construction process requires the completion of multiple procedures such as rebar tying, formwork erection, pouring, and curing on-site, which is not only complex and cumbersome to operate, but also has a long curing time and slow construction progress. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that in the construction of cast-in-place concrete slab column foundations, the lack of water and electricity resources in remote areas makes it difficult to achieve a continuous and stable water and electricity supply, which makes foundation construction difficult. Moreover, multiple processes such as on-site reinforcement binding, formwork erection, pouring, and curing need to be completed, which is not only complicated and cumbersome, but also has a long curing time and slow construction progress.

[0006] To address the aforementioned technical problems, the present invention provides a prefabricated foundation, comprising: Base; Support columns, vertically mounted on the base, are used to fix the transmission line towers; The first connector is sleeved on the bottom of the support column and fixedly connected to the support column. The first connector has multiple mounting holes. The second connector is embedded in the base. The second connector has at least one extension section extending upward to the top of the base. Each extension section has a connecting screw hole extending in the vertical direction. There are multiple fixing bolts, each corresponding to a connecting screw hole. The lower part of each fixing bolt is installed in the connecting screw hole, and the upper end of each fixing bolt passes through the mounting hole.

[0007] Preferably, the first connecting member includes an annular sleeve and a connecting plate fixed to the bottom of the annular sleeve; The annular sleeve is fixed to the outer periphery of the bottom of the support column, and the mounting hole is located on the connecting plate on the outer side of the annular sleeve.

[0008] Preferably, the second connector further includes a plurality of vertically arranged reinforcing plates; Multiple reinforcing plates are arranged at intervals along the outer circumference of the annular sleeve. Each reinforcing plate is perpendicular to the side wall of the annular sleeve, and each reinforcing plate is simultaneously fixedly connected to the annular sleeve and the connecting plate.

[0009] Preferably, multiple mounting intervals are formed between the multiple reinforcing plates along the outer periphery of the annular sleeve, and multiple mounting holes are sequentially arranged in each mounting interval along the outer periphery of the annular sleeve.

[0010] Preferably, the supporting column includes a steel cage, an annular sleeve is fitted and fixed on the steel cage, and concrete is poured into the steel cage to form the supporting column.

[0011] Preferably, the reinforcing cage is welded and fixed to both the annular sleeve and the connecting plate, and the outer surface of the supporting column is flush with the outer surface of the annular sleeve.

[0012] Preferably, the extension section is a threaded sleeve, and the second connector also includes a base plate. Multiple threaded sleeves are fixed to the base plate. Each threaded sleeve is arranged vertically, and the top end of each threaded sleeve extends to the top surface of the base. The threaded hole of the threaded sleeve forms a connecting threaded hole.

[0013] Preferably, the fixing bolt includes a connecting thread and a mounting nut; The connecting screw passes through the mounting hole and the connecting screw hole in sequence. The mounting nut is threaded onto the upper part of the connecting screw, and the bottom of the mounting nut abuts against the first connecting piece.

[0014] Preferably, the connecting screw has a threadless section in the middle; The connecting screw passes through the mounting hole and the connecting screw hole in sequence, with the unthreaded section located inside the mounting hole.

[0015] The present invention provides a transmission line tower, including the above-mentioned prefabricated foundation and tower body, wherein the tower body is fixed on a supporting column.

[0016] Compared with the prior art, the prefabricated foundation and transmission line tower of the present invention have the following advantages: This invention discloses a prefabricated foundation and transmission line tower, comprising a base, a supporting column, a first connector, a second connector, and fixing bolts. The second connector is fixed within the base, and the first connector is fixed to the bottom of the supporting column. The second connector and the base are prefabricated and assembled in a factory to form a first prefabricated component, and the first connector and the supporting column are prefabricated and assembled in a factory to form a second prefabricated component. Both the first and second prefabricated components are completed in the factory, eliminating the need to consider on-site resource conditions. After the first and second prefabricated components arrive at the site, the first prefabricated component is hoisted into the foundation pit, and then the second prefabricated component is hoisted to the top of the first prefabricated component. The mounting holes are aligned with the connecting bolt holes, and finally, the fixing bolts are passed through the mounting holes and connecting bolt holes to assemble the second prefabricated component with the first prefabricated component. This process is completely independent of the water and electricity conditions at the construction site, fundamentally eliminating the rigid requirement for a continuous and stable water and electricity supply on-site in traditional cast-in-place concrete construction. It solves the technical problem in existing technologies where the scarcity of water and electricity resources in remote areas makes it difficult to achieve a continuous and stable water and electricity supply, leading to difficulties in foundation construction.

[0017] Moreover, this invention prefabricates and assembles the base, supporting column, first connector, and second connector in the factory to form the first prefabricated component and the second prefabricated component. On-site wet operations and long-cycle processes are completed in the factory. When constructing the foundation, the first and second prefabricated components only need to be transported to the site and assembled and fixed with fixing bolts. This greatly reduces the complexity of operation and the risk of error, significantly shortens the construction cycle, and improves the construction efficiency of the foundation. It solves the technical problem in the prior art that multiple processes such as on-site reinforcement binding, formwork, pouring, and curing are not only complicated and cumbersome to operate, but also have a long curing time.

[0018] In summary, the present invention has a simple structure and is easy to operate. It not only solves the technical problem that the construction of cast-in-place concrete slab column foundations is difficult in remote areas due to the scarcity of water and electricity resources, making it difficult to achieve a continuous and stable water and electricity supply, but also solves the technical problem that the existing technology requires multiple processes such as on-site reinforcement binding, formwork erection, pouring, and curing, which is not only complicated and cumbersome to operate, but also has a long curing time. Attached Figure Description

[0019] Figure 1 This is a vertical cross-sectional view of an embodiment of the present invention; Figure 2 This is a top view of the second connector according to an embodiment of the present invention; Figure 3 This is a top view of the base after the second connector is installed according to an embodiment of the present invention; Figure 4 This is a top view of the first connector according to an embodiment of the present invention; Figure 5 This is a top view of the installation support column according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the connection between the threaded sleeve and the screw according to an embodiment of the present invention.

[0020] In the diagram, 1 is the base; 2 is the supporting column; 21 is the reinforcing cage; 3 is the first connector; 3a is the mounting hole; 31 is the annular sleeve; 32 is the connecting plate; 33 is the reinforcing plate; 4 is the second connector; 4a is the connecting screw hole; 41 is the base plate; 42 is the threaded sleeve; 5 is the fixing bolt; 51 is the connecting screw; 51a is the unthreaded section; and 52 is the mounting nut. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "bottom", "inner", "outer" and other terms used in this invention to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] It should be understood that the terms "first," "second," etc., are used in this invention to describe various types of information, but these terms are not limited to them; they are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] like Figures 1 to 6As shown, a prefabricated foundation according to a preferred embodiment of the present invention includes a base 1, a supporting column 2, a first connector 3, a second connector 4, and fixing bolts 5. The base 1 is supported on the ground, and the supporting column 2 is vertically mounted on the base 1 for fixing the transmission line tower. The first connector 3 is sleeved on the bottom of the supporting column 2 and fixedly connected to it, and has multiple mounting holes 3a. The second connector 4 is embedded in the base 1 and has at least one extension section extending upward to the top of the base 1, each extension section having a connecting screw hole 4a extending vertically. Multiple fixing bolts 5 are provided, each fixing bolt 5 corresponding to a connecting screw hole 4a. The lower part of each fixing bolt 5 is installed in the connecting screw hole 4a, and the upper end of each fixing bolt 5 passes through the mounting hole 3a to fix the first connector 3 and the second connector 4.

[0026] In one embodiment of the present invention, a prefabricated foundation is constructed whereby the second connector 4 and the base 1 are prefabricated and assembled in a factory to form a first prefabricated component, and the first connector 3 and the supporting column 2 are prefabricated and assembled in a factory to form a second prefabricated component. Both the first and second prefabricated components are completed in the factory, eliminating the need to consider on-site resource conditions. After the first and second prefabricated components arrive at the site, the first prefabricated component is hoisted into the foundation pit, and then the second prefabricated component is hoisted onto top of the first prefabricated component. The mounting hole 3a is aligned with the connecting screw hole 4a, and finally, the fixing bolt 5 is passed through the mounting hole 3a and the connecting screw hole 4a to assemble the second and first prefabricated components. This process is completely independent of the water and electricity conditions at the construction site, fundamentally eliminating the rigid requirement for a continuous and stable water and electricity supply in traditional cast-in-place concrete construction. It solves the technical problem in existing technologies where the scarcity of water and electricity resources in remote areas makes it difficult to achieve a continuous and stable water and electricity supply, leading to difficulties in foundation construction.

[0027] Moreover, in this embodiment of the invention, the base 1, supporting column 2, first connector 3, and second connector 4 are prefabricated and assembled in the factory to form the first prefabricated component and the second prefabricated component. On-site wet operations and long-cycle processes are completed in the factory. When constructing the foundation, the first and second prefabricated components only need to be transported to the site and assembled and fixed by fixing bolts 5. This greatly reduces the complexity of operation and the risk of error, significantly shortens the construction cycle, and improves the construction efficiency of the foundation. It solves the technical problem in the prior art that multiple processes such as on-site reinforcement binding, formwork, pouring, and curing are not only complicated and cumbersome to operate, but also have a long curing time.

[0028] Furthermore, such as Figure 1 , Figure 4 and Figure 5As shown, the first connecting member 3 includes an annular sleeve 31 and a connecting plate 32 fixed to the bottom of the annular sleeve 31. The annular sleeve 31 is fitted and fixed to the outer periphery of the bottom of the supporting column 2, and the mounting hole 3a is provided on the connecting plate 32 on the outer side of the annular sleeve 31. In this embodiment of the invention, the supporting column 2 is a variable cross-section square column, whose cross-section decreases from bottom to top. The supporting column 2 includes a reinforcing cage 21, and the annular sleeve 31 is fitted and fixed to the reinforcing cage 21. Concrete is poured into the reinforcing cage 21 to form the supporting column 2. Specifically, the annular sleeve 31 and the connecting plate 32 are both made of steel and are welded together. The annular sleeve 31 and the reinforcing cage 21 are welded and fixed to form an integral whole, and then concrete is poured into the reinforcing cage 21 to form the supporting column 2, so as to achieve a fixed connection between the annular sleeve 31 and the supporting column 2. After the annular sleeve 31 is welded to the reinforcing cage 21, concrete is poured, making the annular sleeve 31 and the supporting column 2 a whole. The connection between the two is strong and the connection between the two is reliable. At the same time, the annular sleeve 31 welded to the reinforcing cage 21 can not only serve as a template for the pouring of the supporting column 2, but also the clamping effect of the annular sleeve 31 increases the bearing capacity of the supporting column 2 at the annular sleeve 31, making up for the strength reduction caused by the annular sleeve 31 occupying the position of the concrete protective layer outside the reinforcing cage 21.

[0029] Furthermore, such as Figure 4 As shown in the embodiment of the invention, the connecting plate 32 is provided with square holes for concrete flow, so that the bottom surface of the cast support column 2 is flush with the bottom surface of the connecting plate 32. The lower end of the support column 2 is embedded in the square holes, which enhances the connection strength between the support column 2 and the first connector 3. The bottom of the reinforcing cage 21 is also welded and fixed to the connecting plate 32 around the square holes. The reinforcing cage 21 is also welded and fixed to the annular sleeve 31 and the connecting plate 32, which further enhances the connection strength between the first connector 3 and the support column 2. The outer surface of the support column 2 is flush with the outer surface of the annular sleeve 31, avoiding abrupt changes in cross-section at the annular sleeve 31 and reducing the load-bearing capacity of the support column 2.

[0030] Furthermore, such as Figure 1 , Figure 4 and Figure 5As shown, to further enhance the connection strength between the supporting column 2 and the base 1, the second connecting member 4 also includes multiple vertically arranged reinforcing plates 33. These reinforcing plates 33 are spaced apart along the outer periphery of the annular sleeve 31, each reinforcing plate 33 being perpendicular to the side wall of the annular sleeve 31. Each reinforcing plate 33 simultaneously and fixedly connects the annular sleeve 31 and the connecting plate 32, forming multiple installation intervals along the outer periphery of the annular sleeve 31. Multiple installation holes 3a are sequentially arranged within each installation interval along the outer periphery of the annular sleeve 31. In this embodiment of the invention, each reinforcing plate 33 is a steel plate, and each reinforcing plate 33 is welded and fixed to the annular sleeve 31 and the connecting plate 32. The addition of the reinforcing plates 33 enhances the shear bearing capacity of the bottom of the supporting column 2, improving the bearing capacity and stability of the prefabricated foundation.

[0031] Furthermore, such as Figure 1 , Figure 2 and Figure 3 As shown, the extension section is a threaded sleeve 42, and the second connector 4 also includes a base plate 41. Multiple threaded sleeves 42 are fixed to the base plate 41. Each threaded sleeve 42 is arranged vertically, and the top end of each threaded sleeve 42 extends to the top surface of the base 1. The threaded hole of the threaded sleeve 42 forms a connecting threaded hole 4a. In this embodiment of the invention, the base 1 is made of concrete, and the base plate 41 and the threaded sleeve 42 are both made of steel. The base plate 41 is formed by welding and fixing four strip plates. The threaded sleeve 42 is arranged at intervals along the length direction of each strip plate, and each threaded sleeve 42 corresponds to the mounting hole 3a on the connecting plate 32. The base plate 41 and the threaded sleeve 42 are both embedded in the base 1. When the transmission line tower fixed on the support column 2 bears horizontal loads such as wind loads or seismic loads, the support column 2 transfers the load to the fixing bolt 5, and the fixing bolt 5 transfers the load to the second connecting member 4. The concrete of the base 1 is wrapped around the outer periphery of the second connecting member 4, which greatly improves the bearing capacity of the second connecting member 4 and further enhances the bearing capacity and stability of the prefabricated foundation.

[0032] Furthermore, such as Figure 1 and Figure 6As shown, the fixing bolt 5 includes a connecting screw 51 and a mounting nut 52. The connecting screw 51 passes through the mounting hole 3a and the connecting screw hole 4a in sequence. The mounting nut 52 is threaded onto the upper part of the connecting screw 51, and the bottom of the mounting nut 52 abuts against the first connecting member 3. During installation, the mounting hole 3a on the first connecting member 3 at the bottom of the support column 2 is aligned with the connecting screw hole 4a on the second connecting member 4 on the base 1. Then, the connecting screw 51 passes through the mounting hole 3a and the connecting screw hole 4a in sequence to make the connecting screw 51 threadedly fixedly connected to the threaded sleeve 42. Subsequently, the mounting nut 52 is installed on the upper part of the connecting screw 51 and screwed on to make the mounting nut 52 abut against the top surface of the connecting plate 32, thereby achieving a fixed connection between the first connecting member 3 and the second connecting member 4, and thus achieving a fixed connection between the base 1 and the support column 2.

[0033] Furthermore, such as Figure 6 As shown, the connecting screw 51 has a threadless section 51a in the middle. The connecting screw 51 passes through the mounting hole 3a and the connecting screw hole 4a in sequence, with the threadless section 51a located inside the mounting hole 3a. In this embodiment of the invention, the threadless section 51a in the middle of the connecting screw 51 is not threaded and has a smooth surface. When the connecting screw 51 is installed in place, the threadless section 51a is located inside the mounting hole 3a. When the support column 2 is subjected to external disturbance, the support column 2 causes the connecting plate 32 to undergo a slight displacement in the horizontal direction. Because the surface of the threadless section 51a is smooth and without threads, the contact friction between the connecting plate 32 and the connecting screw 51 is reduced, avoiding the high friction between the connecting plate 32 and the connecting screw 51 from causing the connecting screw 51 to loosen and causing the connection between the support column 2 and the base 1 to fail.

[0034] like Figures 1 to 6 As shown, based on the prefabricated foundation of the above-described embodiment of the invention, this embodiment of the invention provides a transmission line tower, including the prefabricated foundation and tower body of the above-described embodiment of the invention, with the tower body fixed on the supporting column 2.

[0035] The working process of this invention is as follows: the second connector 4 and the base 1 are prefabricated and assembled in the factory to form the first prefabricated component, and the first connector 3 and the support column 2 are prefabricated and assembled in the factory to form the second prefabricated component. After the first and second prefabricated components are transported to the site, the first prefabricated component is hoisted into the foundation pit, and the second prefabricated component is hoisted to the top of the first prefabricated component. The mounting hole 3a is aligned with the connecting screw hole 4a, and finally the fixing bolt 5 is passed through the mounting hole 3a and the connecting screw hole 4a to realize the assembly of the second prefabricated component and the first prefabricated component, thereby realizing the fixed connection between the base 1 and the support column 2.

[0036] In summary, the prefabricated foundation and transmission line tower provided by this invention involves the second connector 4 and the base 1 being prefabricated and assembled in a factory to form a first prefabricated component, and the first connector 3 and the supporting column 2 being prefabricated and assembled in a factory to form a second prefabricated component. Both the first and second prefabricated components are completed in the factory, eliminating the need to consider on-site resource conditions. After the first and second prefabricated components arrive at the site, the first prefabricated component is hoisted into the foundation pit, and then the second prefabricated component is hoisted to the top of the first prefabricated component. The mounting hole 3a is aligned with the connecting screw hole 4a, and finally, the fixing bolt 5 is passed through the mounting hole 3a and the connecting screw hole 4a to assemble the second prefabricated component with the first prefabricated component. This process is completely independent of the water and electricity conditions at the construction site, fundamentally eliminating the rigid requirement for a continuous and stable water and electricity supply on-site in traditional cast-in-place concrete construction. It solves the technical problem in existing technologies where the scarcity of water and electricity resources in remote areas makes it difficult to achieve a continuous and stable water and electricity supply during the construction of cast-in-place concrete slab-column foundations, leading to difficulties in foundation construction.

[0037] Moreover, in this embodiment of the invention, the base 1, supporting column 2, first connector 3, and second connector 4 are prefabricated and assembled in the factory to form the first prefabricated component and the second prefabricated component. On-site wet operations and long-cycle processes are completed in the factory. When constructing the foundation, the first and second prefabricated components only need to be transported to the site and assembled and fixed by fixing bolts 5. This greatly reduces the complexity of operation and the risk of error, significantly shortens the construction cycle, and improves the construction efficiency of the foundation. It solves the technical problem in the prior art that multiple processes such as on-site reinforcement binding, formwork, pouring, and curing are not only complicated and cumbersome to operate, but also have a long curing time.

[0038] In summary, the embodiments of the present invention have a simple structure and are easy to operate. They not only solve the technical problem that the lack of water and electricity resources in remote areas makes it difficult to achieve a continuous and stable water and electricity supply during the construction of cast-in-place concrete slab column foundations, which makes foundation construction difficult, but also solve the technical problem that the existing technology requires multiple processes such as on-site reinforcement binding, formwork erection, pouring, and curing, which is not only complicated and cumbersome to operate, but also has a long curing time.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A prefabricated foundation, characterized in that, include: Base (1); Support column (2) is vertically mounted on the base (1) and used to fix the transmission line tower; The first connector (3) is sleeved on the bottom of the support column (2) and fixedly connected to the support column (2). The first connector (3) is provided with a plurality of mounting holes (3a). The second connector (4) is embedded in the base (1). The second connector (4) has at least one extension section extending upward to the top of the base (1). Each extension section has a connecting screw hole (4a) extending in the vertical direction. There are multiple fixing bolts (5), and each fixing bolt (5) corresponds to a connecting screw hole (4a). The lower part of each fixing bolt (5) is installed in the connecting screw hole (4a), and the upper end of each fixing bolt (5) passes through the mounting hole (3a).

2. The prefabricated foundation according to claim 1, characterized in that, The first connector (3) includes an annular sleeve (31) and a connecting plate (32) fixed to the bottom of the annular sleeve (31); The annular sleeve (31) is fitted and fixed on the outer periphery of the bottom of the support column (2), and the mounting hole (3a) is provided on the connecting plate (32) on the outer side of the annular sleeve (31).

3. The prefabricated foundation according to claim 2, characterized in that, The second connector (4) also includes a plurality of vertically arranged reinforcing plates (33); Multiple reinforcing plates (33) are arranged at intervals along the outer periphery of the annular sleeve (31), each reinforcing plate (33) is perpendicular to the side wall of the annular sleeve (31), and each reinforcing plate (33) is simultaneously fixedly connected to the annular sleeve (31) and the connecting plate (32).

4. The prefabricated foundation according to claim 3, characterized in that, Multiple mounting intervals are formed between the multiple reinforcing plates (33) along the outer periphery of the annular sleeve (31), and multiple mounting holes (3a) are sequentially arranged in each mounting interval along the outer periphery of the annular sleeve (31).

5. The prefabricated foundation according to claim 3, characterized in that, The supporting column (2) includes a steel cage (21), and the annular sleeve (31) is fitted and fixed on the steel cage (21). Concrete is poured into the steel cage (21) to form the supporting column (2).

6. The prefabricated foundation according to claim 5, characterized in that, The steel cage (21) is simultaneously welded and fixed to the annular sleeve (31) and the connecting plate (32), and the outer surface of the supporting column (2) is flush with the outer surface of the annular sleeve (31).

7. The prefabricated foundation according to claim 1, characterized in that, The extension section is a threaded sleeve (42), and the second connector (4) also includes a base plate (41). The multiple threaded sleeves (42) are fixed to the base plate (41). Each threaded sleeve (42) is arranged vertically, and the top end of each threaded sleeve (42) extends to the top surface of the base (1). The threaded hole of the threaded sleeve (42) forms the connecting threaded hole (4a).

8. The prefabricated foundation according to claim 1, characterized in that, The fixing bolt (5) includes a connecting screw (51) and a mounting nut (52); The connecting screw (51) passes through the mounting hole (3a) and the connecting screw hole (4a) in sequence. The mounting nut (52) is threaded onto the upper part of the connecting screw (51), and the bottom of the mounting nut (52) abuts against the first connector (3).

9. The prefabricated foundation according to claim 8, characterized in that, The connecting screw (51) has a threadless section (51a) in the middle. The connecting screw (51) passes through the mounting hole (3a) and the connecting screw hole (4a) in sequence, and the unthreaded section (51a) is located inside the mounting hole (3a).

10. A transmission line tower, characterized in that, Includes the prefabricated foundation and tower body as described in any one of claims 1 to 9, wherein the tower body is fixed to the supporting column (2).

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