Helical anchor structure suitable for hard soil

Abstract

This utility model discloses a spiral anchor structure suitable for hard soil, comprising: a spiral anchor body and a soil breaking structure. The bottom of the spiral anchor body is a triangular plate connected to a casing. The soil breaking structure includes a connector, an air supply pipe, and a hydraulic breaker. The connector is connected to the spiral anchor body, and the air supply pipe is connected to the connector with an outer diameter smaller than the inner diameter of the inner anchor pipe. The hydraulic breaker structure includes a piston structure and a breaking head. The lower part of the breaking head has a first cutting tooth, and the top of the breaking head has a nut adapted to the inner bottom of the casing. The piston structure is located inside the air supply pipe and passes through the casing, threadedly connected to the nut. The tightening direction of the piston rod and the nut is the same as the direction in which the spiral anchor body is driven into the soil. This spiral anchor structure is structurally sound, easy to construct, reduces the hardness of the soil at the anchor tip, breaks up stress concentration in the soil at the anchor tip, and facilitates the smooth driving of the spiral anchor to the designed depth.

Description

Technical Field

[0001] This utility model relates to the field of power transmission line foundations, and in particular provides a spiral anchor structure suitable for hard soil, which is suitable for tower locations with hard soil that are difficult to drill into. Background Technology

[0002] The spiral anchor is an innovative and environmentally friendly foundation, composed of an anchor pipe, anchor disc, and upper platform. It utilizes the resistance of deep soil for anchoring. Construction eliminates the need for excavation; torque is applied to the inner anchor pipe, causing the spiral anchor to be screwed into the deeper soil. This minimizes soil disturbance, fully utilizes the inherent strength of the original soil, and enhances bearing capacity. Spiral anchors are simple to manufacture, easy to install and construct, have fast drilling speeds, and quickly achieve their bearing capacity, significantly shortening construction time and reducing project costs. They also offer minimal environmental impact, high bearing capacity, and minimal deformation, making them crucial for solving foundation construction problems in geological conditions such as quicksand and swamps.

[0003] The screw anchor installation process essentially involves compacting the soil. The space required for the screw anchor to descend comes from the compression of the soil by the anchor rod. The most suitable application scenarios for screw anchor foundations are soft soils and sandy soils with high groundwater levels and low soil density. However, its application in barren or desert areas is limited, mainly because the soil in these areas has high density and limited compressibility. Increasing mechanical power will result in insufficient anchor rod strength, while increasing anchor rod strength requires increasing anchor rod size, which necessitates even greater soil compression and thus greater mechanical power, ultimately leading to an unsolvable cycle during the screwing-in process. Furthermore, simply increasing mechanical power and screw anchor strength has limited effect on increasing the construction depth. After reaching a certain depth, the anchor tube begins to spin freely, and the friction between the screw anchor and the gravelly soil causes severe heat and deformation, further increasing the screwing resistance and soil disturbance, thus reducing the bearing capacity.

[0004] Therefore, proposing a novel spiral anchor structure that can be easily driven into the designed depth in hard soil areas has become an urgent problem to be solved. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a spiral anchor structure suitable for hard soil to solve the problems existing in the prior art.

[0006] This utility model provides a spiral anchor structure suitable for hard soil, comprising: a spiral anchor body and a soil breaking structure. The spiral anchor body includes an inner anchor pipe, anchor discs, triangular plates, a sleeve, a flange, and an outer anchor pipe. Multiple anchor discs are fixedly spaced along the axial direction of the inner anchor pipe to its outer periphery. Multiple triangular plates are spaced apart and connected to the bottom of the inner anchor pipe. The sleeve is coaxially arranged with the inner anchor pipe and its outer periphery is fixedly connected to the triangular plates. The flange is fixedly connected to the top of the inner anchor pipe. The outer anchor pipe has a larger diameter than the inner anchor pipe and is fixedly sleeved on the upper section of the inner anchor pipe. The soil breaking structure includes a connector, an air supply pipe, and a breaker hammer structure. The connector is bolted to the flange. The air supply pipe... The outer diameter is smaller than the inner diameter of the inner anchor pipe. The top end of the air supply pipe is fixedly connected to the connector. The bottom end of the air supply pipe extends into the inner bottom of the inner anchor pipe. The breaker structure includes a piston structure and a breaker head. The piston structure is fitted and installed at the lower end of the air supply pipe, and an anti-deflection structure is provided between the two. The piston structure includes a piston head that mates with the air supply pipe and a piston rod connected to the lower end of the piston head. The free end of the piston rod passes through the sleeve. The lower part of the breaker head is provided with a first cutting tooth. The upper part of the breaker head is fixedly connected with a nut. The inner bottom of the sleeve is provided with a limiting groove that mates with the nut. The bottom end of the piston rod is threadedly connected to the nut. The tightening direction of the piston rod and the nut is the same as the direction in which the driving spiral anchor body is screwed into the soil.

[0007] Preferably, the inner anchor tube and the outer anchor tube are connected by four threaded rods extending radially outward along the inner anchor tube, wherein the four threaded rods are arranged perpendicularly to each other.

[0008] Further preferably, the outer anchor tube is provided with a transverse bolt elongated hole corresponding to the threaded rod, and the threaded rod passes through the transverse bolt elongated hole of the outer anchor tube and is fixed by a nut that mates with it.

[0009] More preferably, the triangular plates are four in number and are connected at equal intervals to the bottom of the inner anchor tube.

[0010] A further preferred embodiment is that the outer end face of the triangular plate is fixedly connected with a second cutting tooth.

[0011] Further preferably, the connector includes a top plate, an annular side plate, and a circumferential bottom plate. A power motor connector is provided directly above the connector, and an air supply pipe connector is provided directly below the connector for connecting to the top end of the air supply pipe. The annular side plate is connected to the lower end of the top plate and has a slag discharge hole and an air supply pipe branch pipe mating hole in its circumference. The circumferential bottom plate is connected to the bottom of the annular side plate for connecting to the flange.

[0012] Further preferably, the anti-deflection structure consists of grooves and protrusions corresponding to the air supply pipe and the piston structure.

[0013] More preferably, the angle between the first cutting tooth and / or the second cutting tooth and the sleeve is 45-60 degrees.

[0014] The spiral anchor structure provided by this utility model, suitable for hard soil, can reduce the hardness of the soil at the anchor tip by breaking up the soil and destroying the stress concentration in the soil at the anchor tip, so that the spiral anchor can be driven into the designed depth smoothly. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 A schematic diagram of the spiral anchor structure suitable for hard soil provided by this utility model;

[0017] Figure 2 This is an enlarged view of the hydraulic breaker structure;

[0018] Figure 3 This is a schematic diagram showing the connection between the connector and the flange.

[0019] Figure 4 This is a top view of the triangular plate and the sleeve. Detailed Implementation

[0020] The present invention will be further explained below with reference to specific implementation schemes, but it is not limited to the present invention.

[0021] To address the issue that existing helical anchors cannot smoothly descend to their designed depth in hard soil areas, such as... Figures 1 to 4As shown, this utility model provides a spiral anchor structure suitable for hard soil, including: a spiral anchor body and a soil breaking structure, wherein the spiral anchor body includes an inner anchor tube 11, an anchor plate 12, a triangular plate 13, a sleeve 14, a flange 15, and an outer anchor tube 16. Multiple anchor plates 12 are fixed to the outer periphery of the inner anchor tube 11 at intervals along the axial direction. Multiple triangular plates 13 are connected at intervals to the bottom of the inner anchor tube 11. The sleeve 14 is connected to the inner anchor tube 11... The outer anchor pipe 16 is coaxially arranged and fixedly connected to the triangular plate 13 on its outer periphery. The flange 15 is fixedly connected to the top of the inner anchor pipe 11. The diameter of the outer anchor pipe 16 is larger than the diameter of the inner anchor pipe 11 and is fixedly sleeved on the upper section of the inner anchor pipe 11. Preferably, an anchor plate is provided at the lower part of the outer anchor pipe. The soil breaking structure includes a connector 21, an air supply pipe 22, and a breaker hammer structure. The connector 21 is bolted to the flange 15. The outer diameter of the air supply pipe 22 is smaller than that of the inner anchor pipe 11. The inner diameter forms a slag discharge channel between the two. The top end of the air supply pipe 22 is fixedly connected to the connector 21, and the bottom end of the air supply pipe 22 extends into the inner bottom of the inner anchor pipe 11. The breaker structure includes a piston structure 231 and a breaker head 232. The piston structure 231 is fitted and installed at the lower end of the air supply pipe 22, and an anti-deflection structure is provided between the two. The piston structure 231 includes a piston head 2311 that cooperates with the air supply pipe 22 and a piston connected to the lower end of the piston head 2311. The piston rod 2312 has its free end passing through the sleeve 14. The lower part of the breaking head 232 is provided with a first cutting tooth 2321, and the upper part of the breaking head 232 is fixedly connected with a nut 2322. The inner bottom of the sleeve 14 is provided with a limiting groove that cooperates with the nut 2322. The bottom end of the piston rod 2312 is threadedly connected to the nut 2322. The tightening direction of the piston rod 2312 and the nut 2322 is the same as the direction in which the driving spiral anchor body is screwed into the soil.

[0022] This spiral anchor structure, suitable for hard soil, includes a spiral anchor body and a soil breaking structure. The bottom of the spiral anchor body is a triangular plate splicing structure, forming a large anchor tip. In the soil breaking structure, a compressor connected to an air supply pipe drives the breaker structure to reciprocate, thereby reducing the hardness of the soil at the anchor tip and breaking the stress concentration in the soil at the anchor tip, so that the spiral anchor can be driven smoothly into the designed depth. The first tooth on the breaker head forms a small anchor tip and can play a soil-stirring role in the horizontal plane during the screwing process. The first tooth on the breaker head can also play a soil-stirring role in the vertical plane during the crushing process. The outer diameter of the air supply pipe is smaller than the inner diameter of the inner anchor pipe, so that a slag discharge channel is formed between the air supply pipe and the inner anchor pipe. The loosened soil of the breaker head can enter the slag discharge channel through the gap between the triangular plates, further reducing the screwing resistance. When the designed depth is reached, the connector is removed from the flange. After lifting the connector head and rotating it in the opposite direction, the piston rod can be separated from the breaker head. The piston rod and the above part in the soil breaking structure can be reused.

[0023] As an improvement to the technical solution, such as Figure 1 As shown, the inner anchor tube 11 and the outer anchor tube 16 are connected by four threaded rods 17 extending radially outward along the inner anchor tube 11, wherein the four threaded rods 17 are arranged perpendicularly to each other.

[0024] As an improvement to the technical solution, the outer anchor tube 16 is provided with a transverse bolt elongated hole corresponding to the threaded rod 17. The threaded rod 17 passes through the transverse bolt elongated hole of the outer anchor tube 16 and is fixed by a nut that mates with it. The position of the inner and outer anchor tubes can be adjusted by adjusting the nut.

[0025] As an improvement to the technical solution, the triangular plates 13 are four in number and are connected at equal intervals to the bottom of the inner anchor tube 11.

[0026] As an improvement to the technical solution, such as Figure 1 As shown, the outer end face of the triangular plate 13 is fixedly connected with a second cutting tooth 131 for mixing soil, which facilitates the spiral anchor to be screwed into the soil.

[0027] As an improvement to the technical solution, such as Figure 3As shown, the connector 21 includes a top plate 211, an annular side plate 212, and a circumferential bottom plate 213. A power motor connector is provided directly above the connector 21, and an air supply pipe connector is provided directly below the connector 21 for connecting to the top end of the air supply pipe 22. The annular side plate 212 is connected to the lower end of the top plate 211 and has a slag discharge hole and an air supply pipe branch pipe mating hole in its circumference. The circumferential bottom plate 213 is connected to the bottom of the annular side plate 212 for connecting to the flange 15. The upper part of the air supply pipe is connected to a branch pipe, which passes through the air supply pipe branch pipe mating hole for connecting to the compressor. The compressor is only connected when the anchor pipe is idling to break the soil.

[0028] As an improvement to the technical solution, the anti-deflection structure is provided with grooves and protrusions (not shown in the figure) corresponding to the air supply pipe 22 and the piston structure 231. The piston structure can be deflected by the cooperation of the grooves and protrusions. The protrusions can be set on the piston head or connected to the piston rod by a connecting rod.

[0029] To facilitate soil insertion, as an improvement to the technical solution, the angle between the first cutting tooth 2321 and / or the second cutting tooth 131 and the sleeve 14 is 45-60 degrees.

[0030] The construction method for the spiral anchor structure applicable to hard soil includes the following steps:

[0031] S1: Fixed connection between the spiral anchor body and the broken soil structure;

[0032] S2: Install the power motor on the connector 21 of the soil breaking structure, and use the power motor to turn the connector 21, thereby driving the inner anchor pipe 11 down until the preset burial depth is reached. If the inner anchor pipe 11 spins idly before reaching the design burial depth, turn off the power motor, connect the air outlet flange of the air compressor to the air inlet flange of the air supply pipe 22, and control the piston structure 231 to reciprocate, thereby driving the breaking head 232 to rise and fall, breaking the soil and releasing soil stress. After that, disconnect the connection between the air compressor and the air inlet pipe 22, start the power motor, and continue to drive the inner anchor pipe 11 down.

[0033] S3: After reaching the designed burial depth, remove the soil breaking structure and adjust the horizontal distance between the inner anchor pipe 11 and the outer anchor pipe 16. The method for removing the soil breaking structure is as follows:

[0034] S31: Remove the bolts connecting the connector 21 and the flange 15;

[0035] S32: Pull the connector 21 up until the nut 2322 on the upper part of the crushing head 232 is inserted into the sleeve 14;

[0036] S33: Rotate the connector 21 in the opposite direction, thereby driving the air supply pipe 22 and the piston structure 231 to rotate synchronously and causing the piston structure 231 to disengage from the nut 2322;

[0037] S34: Lift the connector 21 to completely separate the upper part of the soil breaking structure from the spiral anchor body, wherein the upper part of the soil breaking structure (piston rod and above) can be reused.

[0038] The specific embodiments of this utility model are written in a progressive manner, emphasizing the differences between each implementation scheme, and the similar parts can be referred to each other.

[0039] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A screw anchor structure suitable for use in hard ground, characterised in that, include: The spiral anchor body and the soil breaking structure, wherein the spiral anchor body includes an inner anchor pipe (11), an anchor plate (12), a triangular plate (13), a sleeve (14), a flange (15), and an outer anchor pipe (16). Multiple anchor plates (12) are fixed to the outer periphery of the inner anchor pipe (11) at intervals along its axial direction. Multiple triangular plates (13) are connected at intervals to the bottom of the inner anchor pipe (11). The sleeve (14) is coaxially arranged with the inner anchor pipe (11) and its outer periphery is connected to the triangular plate. (13) Fixed connection: The flange (15) is fixedly connected to the top of the inner anchor pipe (11). The diameter of the outer anchor pipe (16) is larger than the diameter of the inner anchor pipe (11) and is fixedly sleeved on the upper section of the inner anchor pipe (11). The soil breaking structure includes a connector (21), an air supply pipe (22), and a breaking hammer structure. The connector (21) is bolted to the flange (15). The outer diameter of the air supply pipe (22) is smaller than the inner diameter of the inner anchor pipe (11). The top of the air supply pipe (22) is connected to the flange (15). The connector (21) is fixedly connected, and the bottom end of the air supply pipe (22) extends into the inner bottom of the inner anchor pipe (11). The breaker structure includes a piston structure (231) and a breaker head (232). The piston structure (231) is fitted and installed at the lower end of the air supply pipe (22), and an anti-deflection structure is provided between the two. The piston structure (231) includes a piston head (2311) that fits with the air supply pipe (22) and a piston rod (2312) connected to the lower end of the piston head (2311). The piston rod ( The free end of the piston rod (2312) passes through the sleeve (14). The lower part of the breaking head (232) is provided with a first cutting tooth (2321). The upper part of the breaking head (232) is fixedly connected with a nut (2322). The inner bottom of the sleeve (14) is provided with a limiting groove that cooperates with the nut (2322). The bottom end of the piston rod (2312) is threadedly connected to the nut (2322). The tightening direction of the piston rod (2312) and the nut (2322) is the same as the direction in which the driving spiral anchor body is screwed into the soil.

2. A screw anchor structure suitable for hard ground according to claim 1, characterised in that: The inner anchor tube (11) and the outer anchor tube (16) are connected by four threaded rods (17) extending radially outward along the inner anchor tube (11), wherein the four threaded rods (17) are arranged perpendicularly to each other.

3. A screw anchor structure suitable for hard ground according to claim 2, characterised in that: The outer anchor tube (16) is provided with a transverse bolt elongated hole corresponding to the threaded rod (17). The threaded rod (17) passes through the transverse bolt elongated hole of the outer anchor tube (16) and is fixed by a nut that cooperates with it.

4. A screw anchor structure suitable for hard ground according to claim 1, characterized in that: The triangular plates (13) are four in number and are connected at equal intervals to the bottom of the inner anchor tube (11).

5. A screw anchor structure suitable for hard ground according to claim 1, characterized in that: The outer end face of the triangular plate (13) is fixedly connected with a second cutting tooth (131).

6. A screw anchor structure suitable for hard ground according to claim 1, characterized in that: The connector (21) includes a top plate (211), an annular side plate (212), and a circumferential bottom plate (213). A power motor connector is provided directly above the connector (21), and an air supply pipe connector is provided directly below the connector (21) for connecting to the top end of the air supply pipe (22). The annular side plate (212) is connected to the lower end of the top plate (211) and has a slag discharge hole and an air supply pipe branch pipe mating hole in its circumference. The circumferential bottom plate (213) is connected to the bottom of the annular side plate (212) for connecting to the flange (15).

7. A screw anchor structure suitable for hard ground according to claim 1, characterized in that: The anti-deflection structure consists of grooves and protrusions corresponding to the air supply pipe (22) and the piston structure (231).

8. The helical anchor structure suitable for hard soil as described in claim 5, characterized in that: The angle between the first cutting tooth (2321) and / or the second cutting tooth (131) and the sleeve (14) is 45-60 degrees.

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