Rotary drilling anti-sliding pile structure for complex stratum and construction method

Abstract

The application relates to the technical field of water conservancy and hydropower engineering, and discloses a complex stratum rotary digging anti-slide pile construction method, which comprises the following steps: S1: measuring and setting a position one and a position two, and placing a hole one according to the position one and placing a hole two according to the position two; S2: placing one end of an anchor cable into the hole two, limiting the anchor cable by using a limiting assembly, and injecting concrete into the hole two; S3: placing a first steel mesh part on the inner side wall of the hole one and placing a second steel mesh part above the hole one; S4: limiting the anchor cable by using the limiting assembly again; S5: building a wall protection formwork on the outer side wall of the first steel mesh part, and then injecting concrete inward; S6: removing the wall protection formwork, performing anchor cable tensioning and anchor cable locking on the outer end of the anchor cable, smearing rust-proof paint on the outer end of the anchor cable, and sealing the anchor cable, so that the construction of the complex stratum rotary digging anti-slide pile is completed. The application can ensure that the anchor cable is always located on the hole axis during installation, can strengthen the structural strength of a pile body, and can effectively fix a rock-soil body.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and hydropower engineering technology, specifically to rotary-drilled anti-slide pile structures and construction methods in complex strata. Background Technology

[0002] Anti-slide piles are structures that insert piles into stable strata below the sliding surface, utilizing the anchoring effect of the stable soil and rock to balance the landslide thrust and thus stabilize the landslide. Anti-slide piles can be classified into different types based on various criteria. According to the pile head constraint conditions, they can be divided into anchored piles and ordinary piles. Anchored piles are constructed by adding one or more lateral supports to a row of piles (a foundation pit support structure composed of piles arranged in a row). Specifically, the pile heads are connected to the soil and rock mass via prestressed anchor cables.

[0003] The construction process of anchored piles is as follows: First, a construction platform is selected. The first hole for placing the pile body is dug on the construction platform. Then, a steel mesh is placed in the hole, and concrete is poured into the first hole. Next, the construction platform is used as the first plane to dig downwards along the height direction of the pile body until the specified height is reached. The soil at the specified height on one side of the pile body is removed (at this time, the other side of the pile body is in contact with the outer surface of the rock and soil body). Then, a second hole is drilled on one side of the pile body. The second hole penetrates both sides of the pile body and extends into the rock mass. Then, the first anchor cable is placed in the second hole, and concrete is poured into the second hole. The remaining anchor cables are then placed in the same manner to complete the anchored pile construction.

[0004] However, the following problems exist during construction: 1. Drilling a second hole on the already cast pile body can easily damage the structural strength of the pile body and weaken the anti-slide pile's effect in preventing landslides; 2. When injecting concrete into the second hole, because the outer end of the anchor cable (referring to the part located outside the second hole) is relatively long and the diameter of the second hole is larger than the diameter of the anchor cable, the outer end of the anchor cable is prone to move downwards and deviate from the axis of the second hole under its own weight. Moreover, after the concrete in the second hole solidifies, it is impossible to effectively adjust the position of the anchor cable, which reduces the bearing capacity of the anchor cable and thus makes the anti-slide body's effect of fixing the soil and rock poor; 3. Because the second hole penetrates the pile body, injecting concrete into the second hole means that the pile body has been cast twice, making the structural strength of the pile body at this time weaker than the structural strength of the pile body before the second hole was drilled. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide a method for constructing rotary anti-slide piles in complex strata, which can prevent the pile body from being drilled again after pouring (i.e., injecting concrete), ensure that the anchor cable is always located on the hole axis during installation, strengthen the structural strength of the pile body, and effectively fix the rock and soil.

[0006] The technical solution adopted in this invention is as follows: a method for constructing rotary drilling anti-slide piles in complex strata, comprising the following steps:

[0007] S1: Measure and set out to determine the location one for placing the pile body and the location two for placing the anchor cable. The construction personnel then rotary drill the placement hole one according to the determined location one and drill the placement hole two according to the determined location two.

[0008] S2: Insert one end of the anchor cable into the second placement hole and extend it into the rock mass along the second placement hole. The other end is located outside the second placement hole. Adjust the angle between the connecting plate and the support plate on the limiting assembly according to the angle between the anchor cable and the outer surface of the rock mass when the anchor cable is on the axis of the second placement hole, so that the connecting plate is perpendicular to the outer surface of the rock mass and the support plate is perpendicular to the anchor cable. The anchor cable passes through the through hole on the support plate to fix the connecting plate to the rock mass. Concrete is injected into the second placement hole.

[0009] S3: A hollow cubic steel mesh is placed on the inner wall of the placement hole. The first steel mesh portion of the steel mesh is located inside the placement hole, and the second steel mesh portion of the steel mesh is located above the placement hole. One side of the second steel mesh portion is in close contact with the outer surface of the rock and soil body. The outer end of the anchor cable passes through both sides of the second steel mesh portion. The flanges of the H-beams arranged at intervals on one side of the second steel mesh portion are all located directly below the outer end of the anchor cable and abut against the anchor cable. The first steel mesh portion and the second steel mesh portion are welded together.

[0010] S4: Adjust the angle between the connecting plate and the support plate on the limiting assembly according to the angle between the anchor cable and the outer wall of the second steel mesh when the anchor cable is located on the second axis of the placement hole, so that the connecting plate and the outer wall of the second steel mesh are perpendicular, the support plate is perpendicular to the anchor cable, the anchor cable passes through the through hole on the support plate, and then the connecting plate is fixedly connected to the second steel mesh.

[0011] S5: Construct protective wall templates on the outer side wall of the first steel mesh section. The protective wall templates form a hollow cube. The H-beams and limiting components are located inside the protective wall templates. Then, inject concrete into the hollow cube formed by the protective wall templates.

[0012] S6: After the concrete in the hollow cube formed by the placement hole and the retaining wall template has solidified, the retaining wall template is removed, the outer end of the anchor cable is tensioned and locked, the outer end of the anchor cable is cut to the designated position, the outer end of the anchor cable is coated with anti-rust paint and sealed, and the construction of the rotary drilling anti-slide pile in complex strata is completed.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] This invention can prevent the pile body from being drilled again after it has been cast and formed, prevent the strength of the pile body from being damaged, ensure that the pile body is formed as a whole, prevent the reduction of the structural strength of the pile body due to drilling and recasting, ensure that the anchor cable is always located on the axis of the placement hole when it is connected to the rock and soil and the pile body, prevent the load-bearing capacity from being reduced due to the displacement of the anchor cable, and thus effectively fix the rock and soil, ensuring that the anti-slide pile effectively protects against landslides.

[0015] In a preferred embodiment of the present invention, step S2 includes the following steps:

[0016] S201: Insert one end of the anchor cable into the second placement hole and extend it into the rock mass along the second placement hole, while the other end is located outside the second placement hole;

[0017] S202: Determine the position of the anchor cable when the axis of the anchor cable and the second placement hole coincide, so that the upper surface of the connecting plate on the limiting component is perpendicular to the outer surface of the rock and soil body where the second placement hole is located. Manually rotate the screw on the connecting plate so that the support plate is perpendicular to the anchor cable. At the same time, the clamping plate on the support plate rotates and engages in the corresponding clamping groove. The nut is threadedly connected to the screw. At this time, the included angle between the connecting plate and the support plate is the same as the included angle between the anchor cable and the outer surface of the rock and soil body.

[0018] S203: The anchor cable passes through the through hole on the support plate, the connecting plate moves along the axial direction of the anchor cable, and the connecting plate is perpendicular to and fixedly connected to the outer surface of the rock and soil body.

[0019] S204: Concrete is injected into the second placement hole.

[0020] Beneficial effects: Before concrete is injected into the second placement hole, the connecting plate and support plate on the limiting component limit the anchor cable, ensuring that the anchor cable is located on the axis of the second placement hole, that is, limiting the angle between the anchor cable and the outer surface of the rock and soil body, which can prevent the anchor cable from shifting or tilting, and improve the construction quality.

[0021] In a preferred embodiment of the present invention, step S4 includes the following steps:

[0022] S401: Determine the position of the anchor cable when the two axes of the anchor cable and the placement hole coincide, so that the upper end face of the connecting plate is perpendicular to the outer wall of the second steel mesh. Manually rotate the screw on the connecting plate so that the support plate is perpendicular to the anchor cable. At the same time, the clamping plate on the support plate rotates and engages in the corresponding clamping groove. The nut is threadedly connected to the screw. At this time, the included angle between the connecting plate and the support plate is the same as the included angle between the anchor cable and the second steel mesh.

[0023] S402: The anchor cable passes through the through hole on the support plate, the connecting plate moves along the axial direction of the anchor cable, and the connecting plate is perpendicular to and fixedly connected to the outer wall of the second steel mesh.

[0024] Beneficial effects: Before concrete is injected into the first placement hole, the limiting component limits the outer end of the anchor cable again, ensuring that the outer end of the anchor cable is located on the axis of the second placement hole, that is, limiting the angle between the anchor cable and the outer side wall of the second steel mesh, preventing displacement or tilting of the outer end of the anchor cable, and improving construction quality.

[0025] The second objective of this invention is to provide a rotary-drilled anti-slide pile structure for complex strata, including a pile body and multiple anchor cables, and also including the construction method for rotary-drilled anti-slide piles for complex strata as described above. Multiple H-beams are spaced apart on both sides of the pile body. Each H-beam includes two transversely arranged flanges and a web between the two flanges. One end of each anchor cable penetrates both sides of the pile body and is located in the rock and soil mass. The anchor cables are all located above the flanges and can abut against the flanges. Limiting components for limiting the anchor cables are connected between the anchor cables and the outer surface of the rock and soil mass, and between the anchor cables and the pile body.

[0026] Beneficial effects: 1. H-beams can increase the structural strength and stability of the pile body, and can limit and support the part of the anchor cable located in the pile body, ensuring that the end of the anchor cable passing through the pile body is effectively supported, preventing the outer end of the anchor cable from moving downward under the action of gravity due to its own length. The limiting component can ensure that the anchor cable is always on the second axis of the placement hole when the anchor cable extends into the rock and soil, and can also ensure that the outer end of the anchor cable is always on the second axis of the placement hole when the anchor cable passes through the pile body, so that the anchor cable and the pile body can work together to effectively fix the rock and soil.

[0027] In a preferred embodiment of the present invention, the limiting component includes a connecting plate and a supporting plate. The connecting plate has a through groove with an opening extending through the connecting plate from top to bottom. The connecting plate is threadedly connected to a screw rod that passes through one opposite side wall of the through groove. The supporting plate is fixedly connected to the screw rod. One end of the supporting plate passes through the through groove. When the screw rod rotates, the supporting plate rotates within the through groove. The supporting plate has a through hole for supporting the anchor cable.

[0028] Beneficial effects: The screw and connecting plate are connected by threads, which allows the screw to automatically limit its position after rotation, thereby limiting the support plate and ensuring that the anchor cable is always effectively supported by the support plate, so that the anchor cable is located on the second axis of the placement hole.

[0029] In a preferred embodiment of the present invention, the connecting plate is provided with a plurality of slots spaced apart, and the support plate is rotatably connected with a card plate that can be inserted into the slots, and the through hole is located above the card plate.

[0030] Beneficial effects: The slots and plates work together to support the support plate and prevent it from rotating, thereby enhancing the support and limiting of the anchor cable. When the angle between the anchor cable and the outer surface of the rock and soil body is different, the angle between the support plate and the connecting plate is also different. At this time, multiple slots can facilitate the plate to be inserted into the corresponding slots. The through hole is located above the plate, which can ensure that the outer end of the anchor cable can effectively pass through the through hole.

[0031] In a preferred embodiment of the present invention, the distance between one end of the support plate and the screw is greater than the distance between the end of the connecting plate near the slot and the side wall of the through slot.

[0032] Beneficial effects: When the outer end of the anchor cable faces the ground, the distance between one end of the support plate and the screw is greater than the distance between the end of the connecting plate near the slot and the side wall of the through slot, which can ensure that the outer end of the anchor cable can effectively pass through the through hole, so that the limiting component can limit the anchor cable under different conditions.

[0033] In a preferred embodiment of the present invention, a nut is threadedly connected to one end of the screw that passes through the side wall of the through groove.

[0034] Beneficial effects: The cooperation between the nut and the screw can further limit the screw's position, increasing its stability and preventing it from rotating relative to the connecting plate. This, in turn, increases the stability of the support plate, ensuring that the cooperation between the support plate and the connecting plate effectively supports and limits the anchor cable.

[0035] In a preferred embodiment of the present invention, both the limiting component and the H-beam are located within the pile body.

[0036] Beneficial effects: The H-beams located inside the pile body can effectively enhance the structural strength and stability of the pile body. The limiting components located inside the pile body can ensure that the outer end of the anchor cable is always on the axis of the placement hole when the pile body is injected with concrete, which facilitates construction. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the rotary drilling anti-slide pile structure in complex strata of the present invention;

[0038] Figure 2 This is a partial structural schematic diagram of the rotary drilling anti-slide pile structure in complex strata of the present invention;

[0039] Figure 3 This is a structural schematic diagram of position A in the present invention;

[0040] Figure 4 This is a partial structural schematic diagram of the rotary drilling anti-slide pile structure in complex strata of the present invention from another angle;

[0041] Figure 5 This is a schematic diagram of the structure at position B of the present invention;

[0042] Figure 6 This is a partial structural diagram of the rotary drilling anti-slide pile structure in complex strata of the present invention from another angle. Detailed Implementation

[0043] Typical embodiments embodying the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0044] In the description of this application, the terms "first," "second," "side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] The reference numerals in the attached drawings include: 1. Pile body; 2. Anchor cable; 3. H-beam; 4. Wing plate; 5. Web plate; 6. Limiting component; 7. Connecting plate; 8. Support plate; 9. Through groove; 10. Screw; 11. Through hole; 12. Slot; 13. Card plate.

[0047] Explanation: Complex strata refer to strata that have been damaged by geological tectonic movements, which have caused the strata to be subjected to pressure, tension, shear and torsion, resulting in phenomena such as folding and fracturing, and thus forming joints, foliation, cracks, faults and other defects.

[0048] The construction method for rotary drilling anti-slide piles in complex strata includes the following steps:

[0049] S1: Measure and set out to determine the location one for placing the pile body 1 and the location two for placing the anchor cable 2. The construction personnel then rotary drill the placement hole one according to the determined location one and drill the placement hole two according to the determined location two.

[0050] S2: Insert one end of the anchor cable 2 into the placement hole 2 and extend it into the rock mass along the placement hole 2. The other end is located outside the placement hole 2. Adjust the angle between the connecting plate 7 and the support plate 8 on the limiting component 6 according to the angle between the anchor cable 2 and the outer surface of the rock mass when the anchor cable 2 is on the axis of the placement hole 2. Make the connecting plate 7 perpendicular to the outer surface of the rock mass, the support plate 8 perpendicular to the anchor cable 2, and the anchor cable 2 pass through the through hole 11 on the support plate 8. Fix the connecting plate 7 to the rock mass and inject concrete into the placement hole 2.

[0051] Specifically, S201: One end of the anchor cable 2 is placed into the placement hole 2 and extends into the rock mass along the placement hole 2, while the other end is located outside the placement hole 2;

[0052] S202: Determine the position of anchor cable 2 when the axes of anchor cable 2 and placement hole 2 coincide, so that the upper end face of the connecting plate 7 on the limiting component 6 is perpendicular to the outer surface of the rock and soil body where placement hole 2 is located. Manually rotate the screw 10 on the connecting plate 7 so that the support plate 8 is perpendicular to anchor cable 2. Since the screw 10 and the connecting plate 7 are threadedly connected, the position of the screw 10 relative to the connecting plate 7 is relatively fixed after rotation. Therefore, the position of the support plate 8 relative to the connecting plate 7 is relatively fixed. At the same time, the clamping plate 13 on the support plate 8 rotates and is inserted into the corresponding clamping groove 12. The nut is threadedly connected to the screw 10 to further limit the screw 10, ensuring that the position of the support plate 8 relative to the connecting plate 7 is relatively fixed, ensuring the stable support and limitation of anchor cable 2 by the support plate 8. At this time, the included angle between the connecting plate 7 and the support plate 8 is the same as the included angle between anchor cable 2 and the outer surface of rock and soil body.

[0053] S203: The construction worker holds the connecting plate 7 with one hand and guides the outer end of the anchor cable 2 through the through hole 11 on the support plate 8 with the other hand. The connecting plate 7 moves along the axial direction of the anchor cable 2. The connecting plate 7 is perpendicular to the outer surface of the rock and soil body and is fixedly connected. At this time, the support plate 8 and the connecting plate 7 work together to support the outer end of the anchor cable 2 and limit the anchor cable 2 to ensure that the anchor cable 2 is always located on the axis of the second placement hole.

[0054] S204: Place concrete into hole two;

[0055] S3: A hollow cube of steel mesh is placed on the inner wall of the placement hole. The first part of the steel mesh is located inside the placement hole, and the second part of the steel mesh is located above the placement hole. One side of the second part of the steel mesh is close to the outer surface of the rock and soil body. Both the first and second parts of the steel mesh are hollow cubes. The outer end of the anchor cable 2 passes through both sides of the second part of the steel mesh. The flanges 4 of the H-beams 3, which are spaced apart on one side of the second part of the steel mesh, are located directly below the outer end of the anchor cable 2 and abut against the anchor cable 2. The first and second parts of the steel mesh are welded together.

[0056] S4: Adjust the angle between the connecting plate 7 and the support plate 8 on the limiting assembly 6 according to the angle between the anchor cable 2 and the outer wall of the second steel mesh when the anchor cable 2 is located on the axis of the placement hole 2, so that the connecting plate 7 and the outer wall of the second steel mesh are perpendicular, the support plate 8 is perpendicular to the anchor cable 2, the anchor cable 2 passes through the through hole 11 on the support plate 8, and then fix the connecting plate 7 to the second steel mesh.

[0057] Specifically, S401: Determine the position of the anchor cable 2 when the axis of the anchor cable 2 and the second placement hole coincide, so that the upper end face of the connecting plate 7 is perpendicular to the outer wall of the second steel mesh. Manually rotate the screw 10 on the connecting plate 7 so that the support plate 8 is perpendicular to the anchor cable 2. At the same time, the clamping plate 13 on the support plate 8 rotates and is inserted into the corresponding clamping groove 12. The nut is threadedly connected to the screw 10. At this time, the included angle between the connecting plate 7 and the support plate 8 is the same as the included angle between the anchor cable 2 and the second steel mesh, ensuring that the anchor cable 2 is located on the axis of the second placement hole.

[0058] S402: The construction worker holds the connecting plate 7 with one hand and supports the anchor cable 2 with the other hand as it passes through the hole 11 on the support plate 8. The connecting plate 7 moves along the axial direction of the anchor cable 2 and is perpendicular to and fixedly connected to the outer wall of the second steel mesh.

[0059] S5: A retaining wall template is built on the outer side wall of the first steel mesh. The retaining wall template forms a hollow cube. The H-beam 3 and the limiting component 6 connected to the pile body 1 are located inside the retaining wall template. Concrete is then injected into the hollow cube formed by the retaining wall template.

[0060] S6: After the concrete in the hollow cube formed by the placement hole 1 and the retaining wall template has solidified, remove the retaining wall template, tension and lock the outer end of anchor cable 2, cut the outer end of anchor cable 2 to the designated position, apply anti-rust paint to the outer end of anchor cable 2 and seal the anchor, thus completing the construction of rotary drilling anti-slide piles in complex strata.

[0061] like Figures 1 to 6 The rotary-drilled anti-slide pile structure shown is an example of complex strata. Figure 1 , Figure 2 and Figure 6 As shown, the structure includes a pile body 1 and multiple anchor cables 2, and also includes the complex stratum rotary drilling anti-slide pile construction method described above. In this embodiment, there are a total of three pile bodies 1, each pile body 1 being a cube. One end of each anchor cable 2 penetrates both sides of the pile body 1 and is located within the rock and soil mass. In this embodiment, each pile body 1 contains a total of two anchor cables 2. Limiting components 6 for limiting the anchor cables 2 are connected between the anchor cables 2 and the outer surface of the rock and soil mass, and between the anchor cables 2 and the pile body 1. Figure 3 , Figure 4 and Figure 5As shown, the limiting component 6 includes a connecting plate 7 and a support plate 8. The connecting plate 7 has a through groove 9 with an opening extending vertically through the connecting plate 7. Multiple slots 12 are spaced apart on the connecting plate 7. In this embodiment, a total of three slots 12 are provided. The longitudinal section of each slot 12 is trapezoidal, with the lower base of the trapezoid located on the upper surface of the connecting plate 7. A screw 10 is threadedly connected to the connecting plate 7, penetrating one opposite sidewall of the through groove 9. One end of the screw 10, passing through the sidewall of the through groove 9, is threadedly connected to a nut, and the other end is provided with a handle. The handle is equipped with a safety feature. The sliding stripe, the support plate 8 is fixedly connected to the screw 10, one end of the support plate 8 passes through the through groove 9, the side width of the through groove 9 is greater than the side width of the support plate 8, when the screw 10 rotates, the support plate 8 rotates in the through groove 9, the support plate 8 is provided with a through hole 11 for supporting the anchor cable 2, and a locking plate 13 that can be locked into the locking groove 12 is rotatably connected to the support plate 8, the through hole 11 is located above the locking plate 13, the distance between one end of the support plate 8 and the screw 10 is greater than the distance between the end of the connecting plate 7 near the locking groove 12 and the side wall of the through groove 9.

[0062] like Figure 2 As shown, multiple H-beams 3 are spaced apart on both sides of each pile body 1 along the height direction of the pile body 1. In this embodiment, six H-beams 3 are spaced apart on one side of the pile body 1 and five H-beams 3 are spaced apart on the other side. The H-beams 3 on each pile body 1 are connected to the corresponding H-beams 3 on the adjacent pile body 1, which can improve the structural strength of the pile body 1. The H-beams 3 include two transversely arranged wing plates 4 and a web plate 5 located between the two wing plates 4. The anchor cables 2 are all located above the wing plates 4 and can abut against the wing plates 4. The limiting component 6 is at a distance from the H-beams 3. Both the limiting component 6 and the H-beams 3 are located inside the pile body 1.

[0063] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A method for constructing rotary-drilled anti-slide piles in complex strata, characterized by: Includes the following steps: S1: Measure and set out to determine the location one for placing the pile body and the location two for placing the anchor cable. The construction personnel then rotary drill the placement hole one according to the determined location one and drill the placement hole two according to the determined location two. S2: Insert one end of the anchor cable into the second placement hole and extend it into the rock mass along the second placement hole. The other end is located outside the second placement hole. Adjust the angle between the connecting plate and the support plate on the limiting assembly according to the angle between the anchor cable and the outer surface of the rock mass when the anchor cable is on the axis of the second placement hole, so that the connecting plate is perpendicular to the outer surface of the rock mass and the support plate is perpendicular to the anchor cable. The anchor cable passes through the through hole on the support plate to fix the connecting plate to the rock mass. Concrete is injected into the second placement hole. The limiting component includes a connecting plate and a support plate. The connecting plate has a through groove with an opening extending through the connecting plate from top to bottom. The connecting plate is threadedly connected to a screw rod that passes through one opposite side wall of the through groove. The support plate is fixedly connected to the screw rod. One end of the support plate passes through the through groove. When the screw rod rotates, the support plate rotates within the through groove. The support plate has a through hole for supporting the anchor cable. The connecting plate is provided with multiple slots at intervals, and the support plate is rotatably connected with a card plate that can be inserted into the slots. The through hole is located above the card plate. The distance between one end of the support plate and the screw is greater than the distance between the end of the connecting plate near the slot and the side wall of the through slot; A nut is threaded onto one end of the screw that passes through the side wall of the slot. S3: A hollow cubic steel mesh is placed on the inner wall of the placement hole. The first steel mesh portion of the steel mesh is located inside the placement hole, and the second steel mesh portion of the steel mesh is located above the placement hole. One side of the second steel mesh portion is in close contact with the outer surface of the rock and soil body. The outer end of the anchor cable passes through both sides of the second steel mesh portion. The flanges of the H-beams arranged at intervals on one side of the second steel mesh portion are all located directly below the outer end of the anchor cable and abut against the anchor cable. The first steel mesh portion and the second steel mesh portion are welded together. S4: Adjust the angle between the connecting plate and the support plate on the limiting assembly according to the angle between the anchor cable and the outer wall of the second steel mesh when the anchor cable is located on the second axis of the placement hole, so that the connecting plate and the outer wall of the second steel mesh are perpendicular, the support plate is perpendicular to the anchor cable, the anchor cable passes through the through hole on the support plate, and then the connecting plate is fixedly connected to the second steel mesh. S5: Construct protective wall templates on the outer side wall of the first steel mesh section. The protective wall templates form a hollow cube. The H-beams and limiting components are located inside the protective wall templates. Then, inject concrete into the hollow cube formed by the protective wall templates. S6: After the concrete in the hollow cube formed by the placement hole and the retaining wall template has solidified, the retaining wall template is removed, the outer end of the anchor cable is tensioned and locked, the outer end of the anchor cable is cut to the designated position, the outer end of the anchor cable is coated with anti-rust paint and sealed, and the construction of the rotary drilling anti-slide pile in complex strata is completed.

2. The method for constructing rotary anti-slide piles in complex strata according to claim 1, characterized in that: Step S2 includes the following steps: S201: Insert one end of the anchor cable into the second placement hole and extend it into the rock mass along the second placement hole, while the other end is located outside the second placement hole; S202: Determine the position of the anchor cable when the axis of the anchor cable and the second placement hole coincide, so that the upper surface of the connecting plate on the limiting component is perpendicular to the outer surface of the rock and soil body where the second placement hole is located. Manually rotate the screw on the connecting plate so that the support plate is perpendicular to the anchor cable. At the same time, the clamping plate on the support plate rotates and engages in the corresponding clamping groove. The nut is threadedly connected to the screw. At this time, the included angle between the connecting plate and the support plate is the same as the included angle between the anchor cable and the outer surface of the rock and soil body. S203: The anchor cable passes through the through hole on the support plate, the connecting plate moves along the axial direction of the anchor cable, and the connecting plate is perpendicular to and fixedly connected to the outer surface of the rock and soil body. S204: Concrete is injected into the second placement hole.

3. The method for constructing rotary anti-slide piles in complex strata according to claim 1, characterized in that: Step S4 includes the following steps: S401: Determine the position of the anchor cable when the two axes of the anchor cable and the placement hole coincide, so that the upper end face of the connecting plate is perpendicular to the outer wall of the second steel mesh. Manually rotate the screw on the connecting plate so that the support plate is perpendicular to the anchor cable. At the same time, the clamping plate on the support plate rotates and engages in the corresponding clamping groove. The nut is threadedly connected to the screw. At this time, the included angle between the connecting plate and the support plate is the same as the included angle between the anchor cable and the second steel mesh. S402: The anchor cable passes through the through hole on the support plate, the connecting plate moves along the axial direction of the anchor cable, and the connecting plate is perpendicular to and fixedly connected to the outer wall of the second steel mesh.

4. A rotary-drilled anti-slide pile structure in complex strata, comprising the pile body and multiple anchor cables, characterized in that: The method also includes the construction method of rotary drilling anti-slide piles in complex strata as described in any one of claims 1 to 3, wherein multiple H-beams are spaced apart on both sides of the pile body, each H-beam includes two transversely arranged wing plates and a web plate located between the two wing plates, one end of each anchor cable penetrates both sides of the pile body and is located in the rock and soil mass, each anchor cable is located above the wing plate and abuts against the wing plate, and a limiting component for limiting the anchor cable is connected between the anchor cable and the outer surface of the rock and soil mass and between the anchor cable and the pile body.

5. The rotary drilling anti-slide pile structure for complex strata according to claim 4, characterized in that: Both the limiting component and the H-beam are located within the pile body.

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