Reinforcement construction structure and method suitable for unstable landslide body

Abstract

The application discloses a reinforcing construction structure and method suitable for unstable landslide bodies, and relates to the technical field of landslide prevention and control, and comprises a cutting slope and a highway pavement; a foundation construction surface is arranged on one side of the cutting slope close to the highway pavement; a plurality of anchoring holes are arranged on the inner side of the top end of the foundation construction surface; the application realizes emergency temporary reinforcement of the landslide body by means of the foundation construction surface, the anti-slide steel pipe pile, the gravel base layer, the lime fly ash layer, the thick steel plate and the anti-slide supporting pile, quickly restrains the deformation of the slope body, avoids secondary instability, and then the gravel base layer, the lime fly ash layer and the thick steel plate are sequentially laid to form a flat and solid temporary operation platform, a stable bearing surface is provided for the anti-slide supporting pile construction, the disturbance of large construction equipment vibration on the landslide body is effectively reduced, and finally the cooperation of the anti-slide supporting pile and the operation platform ensures the safety of the slope protection pile construction on the unstable landslide body.

Description

Technical Field

[0001] This invention relates to the field of landslide prevention and control technology, specifically to a reinforcement construction structure and method suitable for unstable landslides. Background Technology

[0002] Unstable landslides typically refer to soil and rock masses whose internal stress state is unbalanced and whose resistance to sliding is insufficient to maintain their stability under the influence of natural or human factors, thus exhibiting a clear tendency to slide or potential risk of sliding. These landslides often manifest as surface cracks, local subsidence, slope creep, or the reactivation of existing sliding surfaces. Their stability may be further reduced by factors such as rainfall, earthquakes, changes in groundwater, excavation at the toe of the slope, or loading. If reinforcement or remediation measures are not taken in time, landslides of varying scales may occur, posing a threat to roads, buildings, farmland, and the safety of people's lives and property.

[0003] Chinese patent CN213978997U discloses a reinforcement structure for low slope landslides. When the inner anchor head is fixed to the rock strata under the landslide, the prestressed anchor cable and reinforcement components reinforce the landslide. When it rains, rainwater seeps into the landslide and falls into the water diversion channel, where it is collected to prevent further infiltration. The rainwater in the water diversion channel flows out of the landslide, minimizing the impact of rainwater seeping into the landslide on the connection between the landslide and the rock strata, thus affecting the reinforcement effect.

[0004] When constructing retaining piles on a relatively stable landslide, construction activities such as drilling, pile forming, spoil disposal, and mechanical vibration inevitably disturb the soil of the slope, thereby changing the original stress balance and groundwater seepage conditions within the landslide. This may lead to the formation of new weak structural surfaces within the slope, or further connect and activate existing potential sliding surfaces, causing the landslide, which was originally in a relatively stable state, to become unstable again, triggering secondary sliding, collapse, or even large-scale landslide disasters. Summary of the Invention

[0005] The purpose of this invention is to provide a reinforcement construction structure and method suitable for unstable landslides, so as to solve the problem of landslide instability and secondary disasters caused by disturbance during the construction of slope protection piles.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a reinforcement construction structure suitable for unstable landslides, comprising a road cut slope and a highway pavement;

[0007] The foundation construction surface is located on the side of the cut slope closest to the road surface;

[0008] Multiple anchoring holes are all located on the inner side of the top of the foundation construction surface. Anti-slip steel pipe piles are installed in each of the multiple anchoring holes. Grouting material is filled in both the multiple anchoring holes and the anti-slip steel pipe piles.

[0009] The top of the foundation construction surface is covered with a crushed stone base layer, the top of the crushed stone base layer is covered with two layers of lime-fly ash, and the top of the lime-fly ash layer is covered with multiple thick steel plates.

[0010] Multiple pile location holes are all opened on the top outer side of the foundation construction surface;

[0011] Multiple anti-slide support piles are installed inside the multiple pile location holes.

[0012] Furthermore, the anti-slide support pile includes a reinforcing cage, concrete, anchor hole steel sleeve, two connecting steel plates, and two rubber plugs. The reinforcing cage is pre-embedded inside the concrete. The two connecting steel plates are respectively installed on both sides of the outer wall of the anchor hole steel sleeve. The anchor hole steel sleeve is installed inside the reinforcing cage through the two connecting steel plates. The two rubber plugs are respectively snapped onto both ends of the anchor hole steel sleeve.

[0013] Furthermore, two mounting brackets are installed on the outer walls of both sides of the multiple thick steel plates, and a reinforcing bolt is installed between two adjacent mounting brackets. A reinforcing nut is threaded onto the outer wall of each reinforcing bolt.

[0014] Furthermore, anti-slip strips are installed on the top of each of the multiple thick steel plates, multiple positioning blocks are provided at one end of each of the multiple thick steel plates, and multiple positioning grooves are opened at the other end of each of the multiple thick steel plates, with the positioning blocks engaging with the corresponding positioning grooves.

[0015] Furthermore, the diameter of the anchoring hole is 1.15 times the outer diameter of the anti-slip steel pipe pile, and the grouting material is M30 cement mortar.

[0016] Furthermore, the crushed stone base layer, two layers of lime-fly ash, and multiple thick steel plates are laid sequentially on the foundation construction surface to form a temporary working platform.

[0017] Furthermore, the crushed stone base layer is formed by compacting early-strength lime-fly ash crushed stone, the total thickness of the two lime-fly ash layers is 40cm, and the thickness of the thick steel plate is 20mm.

[0018] Furthermore, the steel sleeve for the anchor cable hole is filled with medium-coarse sand, and the steel sleeve for the anchor cable hole is installed at an angle. The connecting steel plate is welded to the reinforcing cage and the steel sleeve for the anchor cable hole, respectively.

[0019] Furthermore, the mounting bracket is configured as an L-shaped structure, and both the mounting bracket and the anti-slip strip are welded to a thick steel plate. The positioning block and the positioning groove are both configured as dovetail structures, and the positioning block is integrally formed with the thick steel plate.

[0020] A construction method for reinforcing structures suitable for unstable landslides includes the following steps:

[0021] Step 1, Emergency Slope Stabilization: The loose soil at the rear edge and top of the landslide body is partially unloaded to reduce the risk of instability. Then, on the side of the leveled foundation construction surface near the core sliding zone of the slope, an anchoring hole is drilled using a multi-functional fully hydraulic anchoring drilling rig, and anti-slide steel pipe piles are inserted, with their tops flush with the foundation construction surface. Grouting material is then injected under high pressure into the anchoring hole and the anti-slide steel pipe pile to achieve emergency temporary reinforcement.

[0022] Step 2, Platform Construction: After the grout has initially set, using the foundation construction surface and the top area of ​​the anti-slip steel pipe pile as the base, lay a crushed stone base layer, two layers of lime-fly ash layer, and multiple thick steel plates in sequence. Adjacent thick steel plates are rigidly connected by mounting frames, reinforcing bolts, and reinforcing nuts, and are aligned with the positioning slots by positioning blocks. Anti-slip strips are welded to the top of the thick steel plates to form a flat and solid temporary working platform.

[0023] Step 3, Pile Construction: After accurately locating the anti-slide support piles, dismantle the single thick steel plate at the corresponding pile position one by one, clean the debris on the base surface and protect it. The rotary drilling rig drills into the foundation construction surface in layers to form pile position holes. Mud slurry is used to protect the hole wall to prevent collapse. Then, the pre-fabricated steel cage is hoisted into the hole, followed by the installation of the guide pipe and the pouring of concrete. All anti-slide support piles are constructed in sequence.

[0024] Step 4: Permanent Support: After the concrete in the anti-slide support piles reaches the design strength, cast-in-place hanging plates are poured between adjacent anti-slide support piles using a single-sided formwork process. The hanging plates are connected to the pile foundation by rebar installation. Then, the soil in front of the piles is excavated to locate the position of the steel sleeve of the anchor cable hole pre-embedded in the anti-slide support pile. The internal medium-coarse sand and rubber plugs are removed, and the anchor cable steel strands are inserted and tensioned and locked according to the design requirements to complete the reinforcement construction of the entire unstable landslide body.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] (1) This invention utilizes the coordinated work of the foundation construction surface, anti-slide steel pipe piles, crushed stone base layer, lime fly ash layer, thick steel plate and anti-slide support piles to first achieve emergency temporary reinforcement of the landslide body with the help of anti-slide steel pipe piles, quickly constrain slope deformation and avoid secondary instability. Then, a flat and solid temporary working platform is formed by laying crushed stone base layer, lime fly ash layer and thick steel plate in sequence, providing a stable bearing surface for the construction of anti-slide support piles, effectively reducing the disturbance of the landslide body to the vibration of large construction equipment. Finally, through the cooperation of anti-slide support piles and working platform, the safety of slope protection pile construction on unstable landslide body is ensured.

[0027] (2) This invention achieves precise pre-embedding and one-time forming of anchor cable ducts in pile concrete through the coordinated work of steel cage, concrete, anchor cable hole steel sleeve, connecting steel plate and rubber plug. The anchor cable hole steel sleeve is firmly welded to the steel cage. At the same time, the medium and coarse sand filled in the sleeve and the rubber plugs at both ends are used to achieve precise pre-reservation and protection of the anchor cable hole, avoiding grout blockage of the sleeve during concrete pouring. The complete anchor cable hole can be quickly formed without secondary drilling. This not only ensures the bending and sliding bearing capacity of the anti-sliding support pile, but also simplifies the anchor cable construction process and improves the construction efficiency of the permanent support system.

[0028] (3) The present invention achieves rigid connection between adjacent thick steel plates by using the coordinated work of thick steel plates, mounting frame, reinforcing bolts, reinforcing nuts, anti-slip strips, positioning blocks and positioning grooves. The positioning frame, reinforcing bolts and reinforcing nuts are used to achieve rigid connection between adjacent thick steel plates. The positioning blocks and positioning grooves are used to ensure that the thick steel plates are aligned and avoid displacement or misalignment of the thick steel plates during construction. At the same time, the anti-slip strips enhance the anti-slip performance of the equipment when it is working on the thick steel plates. This makes the temporary working platform have the characteristics of high strength, high stability and convenient disassembly and assembly. It not only meets the load-bearing requirements of large equipment such as rotary drilling rigs, but also reduces the project cost through the reuse of steel plates. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0030] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0031] Figure 2 Provided for embodiments of the present invention Figure 1 Enlarged view of the structure of A in the middle;

[0032] Figure 3 A schematic diagram of the installation of anti-sliding steel pipe piles and road cut slopes is provided for embodiments of the present invention;

[0033] Figure 4 A schematic diagram of the installation of a temporary work platform and a road cut slope is provided for embodiments of the present invention;

[0034] Figure 5 A schematic diagram of the installation of anti-slide support piles and road cut slopes is provided for embodiments of the present invention;

[0035] Figure 6 A schematic diagram of the anti-slide support pile is provided for an embodiment of the present invention;

[0036] Figure 7 A structural schematic diagram of a thick steel plate is provided for an embodiment of the present invention;

[0037] Figure 8 Provided for embodiments of the present invention Figure 7 Enlarged view of the structure of B in the middle.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Cut slope; 2. Highway pavement; 3. Foundation construction surface; 4. Anchor hole; 5. Anti-slip steel pipe pile; 6. Grouting material; 7. Crushed stone base course; 8. Lime and fly ash layer; 9. Thick steel plate; 10. Pile location hole; 11. Anti-slip support pile; 12. Reinforcing cage; 13. Concrete; 14. Anchor cable hole steel sleeve; 15. Connecting steel plate; 16. Rubber plug; 17. Mounting frame; 18. Reinforcing bolt; 19. Reinforcing nut; 20. Anti-slip strip; 21. Positioning block; 22. Positioning groove. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] As attached Figure 1 To be continued Figure 8 As shown:

[0042] Example 1:

[0043] This invention provides a reinforcement construction structure suitable for unstable landslides, including a road cut slope 1 and a highway pavement 2, which together form the core scenario boundary for landslide control;

[0044] The foundation construction surface 3 is located on the side of the cut slope 1 closest to the road surface 2;

[0045] Multiple anchor holes 4 are all opened on the inner side of the top of the foundation construction surface 3. Anti-sliding steel pipe piles 5 are installed in multiple anchor holes 4. The anti-sliding steel pipe piles 5 are made of Q235 high-strength steel and have excellent shear and compressive strength. Grouting material 6 is filled in multiple anchor holes 4 and anti-sliding steel pipe piles 5 to achieve tight bonding between the pile body and the surrounding soil.

[0046] The top of the foundation construction surface 3 is covered with a crushed stone base layer 7 to further enhance the bearing capacity of the base. The top of the crushed stone base layer 7 is covered with two layers of lime-fly ash layer 8. The lime-fly ash layer 8 is made of lime, fly ash and graded crushed stone mixed in an optimized ratio. It has the characteristics of rapid early strength growth and good water stability. The top of the lime-fly ash layer 8 is covered with multiple thick steel plates 9 to form a rigid bearing surface.

[0047] Multiple pile location holes 10 are all opened on the top outer side of the foundation construction surface 3;

[0048] Multiple anti-slide support piles 11 are installed inside multiple pile hole 10, serving as the core components for permanent anti-slide protection;

[0049] The diameter of the anchor hole 4 is 1.15 times the outer diameter of the anti-sliding steel pipe pile 5. This ratio has been verified by multiple tests. It can ensure that the anti-sliding steel pipe pile 5 can be successfully implanted and that sufficient space can be reserved for the grouting material 6. The grouting material 6 is M30 cement mortar with a water-cement ratio of 0.55. It has high compressive strength and excellent bonding performance.

[0050] The crushed stone base layer 7, two layers of lime and fly ash layer 8, and multiple thick steel plates 9 are laid sequentially on the foundation construction surface 3 to form a temporary working platform. This platform can quickly construct a working surface with sufficient strength, rigidity, and integrity on the loose and unstable landslide surface to safely support subsequent heavy construction equipment and operations.

[0051] The crushed stone base layer 7 is formed by compacting early-strength lime-fly ash crushed stone, which can quickly form a stable subbase, serve as a drainage layer, and begin to distribute the upper load to the underlying soil. The total thickness of the two lime-fly ash layers 8 is 40cm, which is determined by mechanical calculations and can provide sufficient rigidity. The thickness of the thick steel plate 9 is 20mm, which ensures that the thick steel plate 9 has sufficient local bending rigidity and will not deform or warp excessively under the direct action of the tracks or outriggers of heavy equipment, providing the equipment with a flat and solid direct working surface.

[0052] Working principle: After a landslide occurs, the rear edge of the slope is immediately partially unloaded and leveled to form the foundation construction surface 3. Then, on the side closest to the sliding zone, a multi-functional fully hydraulic anchoring drilling rig is used to drill anchor holes 4 and insert anti-slide steel pipe piles 5. After installation, grouting is performed on the anti-slide steel pipe piles 5. The grouting pipe is inserted into the anti-slide steel pipe pile 5, and M30 cement mortar is injected under high pressure to form a grouting material 6 reinforcement layer. The initial grouting pressure is maintained for three minutes to ensure the grout breaks the rubber band and fills the area around the pile, achieving emergency temporary fixation of the landslide. The immediate reinforcement quickly restrains slope deformation and prevents secondary instability, forming the first line of defense and providing a stable foundation for subsequent operations. Subsequently, a crushed stone base layer 7 composed of early-strength lime-fly ash and crushed stone is laid on the foundation construction surface 3. A 20t road roller is used to compact the crushed stone base layer 7. After compaction, two layers of lime-fly ash with a total thickness of 40cm are laid and compacted in layers. Finally, multiple 20mm thick steel plates 9 are installed on top, forming a temporary working platform with high load-bearing capacity and deformation resistance. The platform not only effectively disperses the load of heavy equipment such as rotary drilling rigs, preventing them from disturbing the unstable soil below, but also enables rapid assembly and turnover through modular steel plates, providing a stable bearing surface for the construction of anti-slide support piles 11. When it is necessary to implant anti-slide support piles 11, large equipment can be used for construction on the temporary work platform. First, the corresponding thick steel plate 9 is disassembled and pile position holes 10 are drilled through the equipment to install permanent anti-slide support piles 11. After the anti-slide support piles 11 are embedded in the stable rock layer, the landslide thrust is transferred step by step to the deep stable strata. Finally, through the cooperation of anti-slide support piles 11 and temporary work platform, the core problem of slope instability caused by the construction of slope protection piles on unstable landslide bodies is solved. The entire reinforcement construction structure, under the premise of ensuring the safety and controllability of the construction process, efficiently completes the seamless transition from temporary emergency rescue to permanent treatment, and completely solves the industry problem of secondary disasters caused by construction on sensitive landslide bodies. It not only ensures the safety and progress of the project itself, but also avoids serious threats to surrounding roads, buildings, and people's lives and property.

[0053] Example 2:

[0054] This embodiment is basically the same as the previous embodiment, except that the anti-slide support pile 11 includes a steel cage 12, concrete 13, anchor hole steel sleeve 14, two connecting steel plates 15 and two rubber plugs 16. The steel cage 12 is welded from main bars, stirrups and reinforcing bars. The main bars are made of HRB400 grade threaded steel and are evenly distributed according to the design spacing. The steel cage 12 is embedded in the concrete 13 to form the load-bearing skeleton of the anti-slide support pile 11, ensuring the bending and shear bearing capacity of the pile body. The two connecting steel plates 15 are respectively installed on both sides of the outer wall of the anchor hole steel sleeve 14. The connecting steel plates 15 are made of Q235 steel plate. The anchor hole steel sleeve 14 is installed in the inside of the steel cage 12 through the two connecting steel plates 15. The two rubber plugs 16 are respectively snapped and installed at both ends of the anchor hole steel sleeve 14 to achieve sealing protection of the inside of the sleeve.

[0055] The steel sleeve 14 for anchor cable holes is filled with medium-coarse sand, which can temporarily occupy and prevent blockage during the pouring of concrete 13. The medium-coarse sand prevents the grout of concrete 13 from flowing into the sleeve and is easy to remove later. The steel sleeve 14 for anchor cable holes is installed at an angle, which ensures the accuracy of the direction of the final anchor cable channel. The connecting steel plate 15 is welded to the steel cage 12 and the steel sleeve 14 for anchor cable holes, which is a rigid, reliable and permanent connection. This ensures that the position of the steel sleeve 14 for anchor cable holes relative to the steel cage 12 is absolutely accurate and firm throughout the entire process of hoisting and lowering the steel cage 12 and pouring concrete 13.

[0056] Working principle: During the prefabrication stage of the reinforcing cage 12, the anchor cable hole steel sleeve 14, filled with medium-coarse sand and sealed at both ends with rubber plugs 16, is precisely installed and fixed in the designated position of the reinforcing cage 12 according to the design requirements of the inclined angle and spatial coordinates through the welded connecting steel plate 15. Subsequently, the reinforcing cage 12 with the pre-embedded sleeve is hoisted into the pile hole 10, and concrete 13 is poured to form the pile body. During this process, the rubber plugs 16 and the medium-coarse sand work together to effectively prevent the concrete slurry 13 from invading the interior of the anchor cable hole steel sleeve 14, achieving precise pre-reservation and protection of the anchor cable hole. After the pile body concrete 13 reaches the design strength and the soil in front of the pile is excavated, it is only necessary to move the steel sleeve 14. After removing the rubber plug 16 and clearing out the medium-coarse sand, a precise and smooth inner wall of the anchor cable channel can be formed instantly. This ensures the core bending and anti-slip bearing capacity of the anti-slip support pile 11, simplifies the anchor cable construction process, and improves the efficiency of building a permanent support system, meeting the dual needs of emergency rescue and long-term reinforcement. This process transforms the complex and time-consuming drilling operations on the hard pile body in the later stages of traditional construction methods into standardized prefabrication and installation in the early stages. This not only completely avoids damage to the main reinforcement of the pile body during drilling and ensures the structural integrity of the pile body, but also greatly shortens the anchor cable construction cycle and significantly improves the construction efficiency and reliability under emergency rescue and confined space conditions.

[0057] Example 3:

[0058] This embodiment is basically the same as the previous embodiment, except that two mounting brackets 17 are installed on the outer walls of both sides of the multiple thick steel plates 9, and a reinforcing bolt 18 is installed between two adjacent mounting brackets 17. A reinforcing nut 19 is threaded on the outer wall of each reinforcing bolt 18, and a rigid connection between adjacent thick steel plates 9 is achieved through the tightening action of the bolt and nut.

[0059] Anti-slip strips 20 are installed on the top of the multiple thick steel plates 9, which can effectively increase the friction coefficient between the equipment and the steel plate surface and prevent the construction equipment from sliding. Multiple positioning blocks 21 are provided on one end of the multiple thick steel plates 9, and multiple positioning grooves 22 are opened on the other end of the multiple thick steel plates 9. The positioning blocks 21 are engaged with the corresponding positioning grooves 22.

[0060] Mounting bracket 17 is designed with an L-shaped structure, which facilitates connection with adjacent steel plates and provides a rigid connection point that can withstand shear forces. Both mounting bracket 17 and anti-slip strip 20 are welded to the thick steel plate 9, ensuring that mounting bracket 17 and anti-slip strip 20 are an integral part of the thick steel plate 9, with reliable connection and the ability to withstand repeated loads and wear during construction. Positioning block 21 and positioning groove 22 are both designed with dovetail structure, which realizes automatic alignment and initial locking of adjacent steel plates in the horizontal direction, preventing lateral displacement of steel plates during laying and under stress. Furthermore, positioning block 21 is integrally formed with thick steel plate 9, ensuring that positioning block 21 has the same strength as thick steel plate 9 and that there are no weak points at the connection, ensuring the reliability and durability of the positioning function.

[0061] Working principle: Each thick steel plate 9 achieves rapid and precise lateral alignment and initial fitting through the dovetail-shaped positioning block 21 at one end and the dovetail-shaped positioning groove 22 of the adjacent steel plate, effectively limiting the horizontal misalignment of the steel plate. Subsequently, the reinforcing bolts 18 are passed through the adjacent mounting brackets 17, and the reinforcing nuts 19 are fitted onto the reinforcing bolts 18 and tightened to achieve reliable vertical locking, thus completing the rigid connection between adjacent thick steel plates 9. This integrates multiple independent thick steel plates 9 into a unified force-bearing platform that can evenly distribute the load of heavy equipment. At the same time, the anti-slip strips 20 welded to the top surface of the steel plates significantly increase the slip resistance. The friction between the platform surface and the equipment tracks or tires effectively prevents the risk of slippage when the equipment is working on a slope. This gives the temporary work platform the characteristics of high strength, high stability and convenient assembly and disassembly. It not only meets the load-bearing requirements of large equipment such as rotary drilling rigs, but also allows for the construction of anti-slip support piles 11 through partial disassembly, thus preserving the integrity of the platform to the greatest extent, ensuring construction safety and efficiency. Furthermore, due to its standardized and detachable characteristics, the platform can be quickly laid, dismantled and recycled, which reduces project costs, improves material turnover and construction efficiency, and ensures load-bearing safety under extreme loads.

[0062] Example 4:

[0063] A construction method for reinforcing structures suitable for unstable landslides includes the following steps:

[0064] Step 1, Emergency Slope Stabilization: The loose soil at the rear edge and top of the landslide body is partially unloaded to reduce the risk of instability. Then, on the side of the foundation construction surface 3 formed by leveling that is close to the core sliding zone of the slope, an anchoring hole 4 is drilled using a multi-functional fully hydraulic anchoring drilling rig, and anti-slide steel pipe piles 5 are inserted. The top of the piles is flush with the foundation construction surface 3. Grouting material 6 is then injected into the anchoring hole 4 and the anti-slide steel pipe piles 5 under high pressure to achieve emergency temporary reinforcement.

[0065] Step 2, Platform Construction: After the grout has initially set, using the foundation construction surface 3 and the top area of ​​the anti-slip steel pipe pile 5 as the base, lay the crushed stone base layer 7, two layers of lime-fly ash layer 8, and multiple thick steel plates 9 in sequence. Adjacent thick steel plates 9 are rigidly connected by the installation frame 17, the reinforcing bolts 18, and the reinforcing nuts 19, and are aligned by the positioning block 21 and the positioning groove 22. The top of the thick steel plate 9 is welded with anti-slip strips 20 to form a flat and solid temporary working platform.

[0066] Step 3, Pile Construction: After accurately locating the anti-slide support pile 11, dismantle the single thick steel plate 9 at the corresponding pile position one by one, clean the debris on the base surface and protect it. The rotary drilling rig drills into the foundation construction surface 3 in layers to form the pile position hole 10. Mud slurry is used to protect the hole wall to prevent it from collapsing. Then, the pre-fabricated steel cage 12 is hoisted into the hole. Subsequently, the guide pipe is installed and concrete 13 is poured. The construction of all anti-slide support piles 11 is completed in sequence.

[0067] Step 4, Permanent Support: After the concrete 13 in the anti-slide support pile 11 reaches the design strength, a cast-in-place hanging plate is poured between adjacent anti-slide support piles 11 using a single-sided formwork process. The hanging plate is connected to the pile foundation by rebar installation. Then, the soil in front of the pile is excavated, the position of the steel sleeve 14 of the anchor cable hole pre-embedded in the anti-slide support pile 11 is located, the internal medium-coarse sand and rubber plug 16 are removed, the anchor cable steel strand is inserted and tensioned and locked according to the design requirements, and the reinforcement construction of the entire unstable landslide body is completed.

[0068] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A reinforcement construction structure suitable for unstable landslides, characterized in that, include: Cut slope (1) and road surface (2); The foundation construction surface (3) is set on the side of the cut slope (1) close to the road surface (2); Multiple anchor holes (4) are opened on the inner side of the top of the foundation construction surface (3). Anti-sliding steel pipe piles (5) are installed in the multiple anchor holes (4). Grouting material (6) is filled in the multiple anchor holes (4) and the anti-sliding steel pipe piles (5). The top of the foundation construction surface (3) is covered with a crushed stone base layer (7), the top of the crushed stone base layer (7) is covered with two layers of lime fly ash (8), and the top of the lime fly ash (8) is covered with multiple thick steel plates (9). Multiple pile holes (10) are all opened on the top outer side of the foundation construction surface (3); Multiple anti-slide support piles (11) are installed inside multiple pile hole (10).

2. The reinforcement construction structure for unstable landslides according to claim 1, characterized in that, The anti-slide support pile (11) includes a steel cage (12), concrete (13), anchor hole steel sleeve (14), two connecting steel plates (15) and two rubber plugs (16). The steel cage (12) is embedded in the concrete (13). The two connecting steel plates (15) are respectively installed on both sides of the outer wall of the anchor hole steel sleeve (14). The anchor hole steel sleeve (14) is installed in the interior of the steel cage (12) through the two connecting steel plates (15). The two rubber plugs (16) are respectively snapped and installed at both ends of the anchor hole steel sleeve (14).

3. The reinforcement construction structure for unstable landslides according to claim 1, characterized in that, Two mounting brackets (17) are installed on both sides of the outer walls of the multiple thick steel plates (9). A reinforcing bolt (18) is installed between two adjacent mounting brackets (17). A reinforcing nut (19) is threaded onto the outer wall of each reinforcing bolt (18).

4. The reinforcement construction structure for unstable landslides according to claim 3, characterized in that, The top of each of the multiple thick steel plates (9) is equipped with an anti-slip strip (20), and one end of each of the multiple thick steel plates (9) is provided with multiple positioning blocks (21). The other end of each of the multiple thick steel plates (9) is provided with multiple positioning grooves (22). The positioning blocks (21) are engaged with the corresponding positioning grooves (22).

5. A reinforcement construction structure suitable for unstable landslides according to claim 1, characterized in that, The diameter of the anchor hole (4) is 1.15 times the outer diameter of the anti-sliding steel pipe pile (5), and the grouting material (6) is M30 cement mortar.

6. The reinforcement construction structure for unstable landslides according to claim 1, characterized in that, The crushed stone base layer (7), two layers of lime-fly ash layer (8) and multiple thick steel plates (9) are laid sequentially on the foundation construction surface (3) to form a temporary working platform.

7. The reinforcement construction structure for unstable landslides according to claim 1, characterized in that, The crushed stone base layer (7) is formed by compacting early-strength lime-fly ash crushed stone, the total thickness of the two lime-fly ash layers (8) is 40cm, and the thickness of the thick steel plate (9) is 20mm.

8. A reinforcement construction structure suitable for unstable landslides according to claim 2, characterized in that, The steel sleeve (14) for anchoring cables is filled with medium-coarse sand and is installed at an angle. The connecting steel plate (15) is welded to the steel cage (12) and the steel sleeve (14) for anchoring cables.

9. A reinforcement construction structure suitable for unstable landslides according to claim 4, characterized in that, The mounting bracket (17) is configured as an L-shaped structure, and the mounting bracket (17) and the anti-slip strip (20) are both welded to the thick steel plate (9). The positioning block (21) and the positioning groove (22) are both configured as dovetail structures, and the positioning block (21) and the thick steel plate (9) are integrally formed.

10. A construction method for a reinforcement structure suitable for unstable landslides, applicable to the reinforcement structure for unstable landslides described in any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1, Emergency Slope Stabilization: The loose soil at the rear edge and top of the landslide body is partially unloaded to reduce the risk of instability. Then, on the side of the foundation construction surface (3) formed by leveling, near the core sliding zone of the slope, an anchor hole (4) is drilled using a multi-functional fully hydraulic anchor drilling machine, and anti-sliding steel pipe piles (5) are inserted so that their tops are flush with the foundation construction surface (3). Then, grouting material (6) is injected into the anchor hole (4) and the anti-sliding steel pipe pile (5) under high pressure to achieve emergency temporary reinforcement. Step 2, Platform Construction: After the grout has initially set, the foundation construction surface (3) and the top area of ​​the anti-slip steel pipe pile (5) are used as the base. Crushed stone base layer (7), two layers of lime fly ash layer (8) and multiple thick steel plates (9) are laid in sequence. The two adjacent thick steel plates (9) are rigidly connected by the installation frame (17), the reinforcing bolt (18) and the reinforcing nut (19), and are aligned with the positioning block (21) and the positioning groove (22). The anti-slip strip (20) is welded to the top of the thick steel plate (9) to form a flat and solid temporary working platform. Step 3, Pile Construction: After accurately locating the anti-slide support pile (11), dismantle the single thick steel plate (9) at the corresponding pile position one by one, clean the debris on the base surface and protect it. The rotary drilling rig drills into the foundation construction surface (3) in layers to form the pile position hole (10). Mud slurry is used to protect the hole wall to prevent it from collapsing. Then, the pre-made steel cage (12) is hoisted into the hole. Then, the guide pipe is installed and concrete is poured (13). The construction of all anti-slide support piles (11) is completed in sequence. Step 4, Permanent Support: After the concrete (13) in the anti-slide support pile (11) reaches the design strength, a cast-in-place hanging plate is poured between adjacent anti-slide support piles (11) using a single-sided formwork process. The hanging plate is connected to the pile foundation by rebar installation. Then, the soil in front of the pile is excavated, the position of the steel sleeve (14) of the anchor cable hole pre-embedded in the anti-slide support pile (11) is located, the internal medium and coarse sand and rubber plug (16) are removed, the anchor cable steel strand is inserted and tensioned and locked according to the design requirements, and the reinforcement construction of the entire unstable landslide body is completed.

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