CN115627781B - A slope reinforcement structure and construction method for rapid treatment of existing slope collapse - Google Patents

Abstract

The invention discloses a slope reinforcement structure for rapidly treating existing slope collapse and a construction method, wherein at least one row of pile nail combined structures are continuously arranged at the lower part of a slope potential sliding body and at the position close to a slope toe; the pile nail combined structure comprises a main nail, an auxiliary nail, a left wing nail and a right wing nail which are embedded in a side slope stabilized soil layer in a Y shape, wherein the main nail is positioned among the auxiliary nail, the left wing nail and the right wing nail, and the main nail is respectively connected with the auxiliary nail, the left wing nail and the right wing nail through reinforced concrete connecting beams, the connecting beams among the main nail, the left wing nail and the right wing nail form a V-shaped included angle and are arranged facing the side slope potential sliding body, lian Liangping between the main nail and the auxiliary nail are arranged in the main sliding direction of the side slope potential sliding body, so that the main nail and the auxiliary nail of each pile nail combined structure integrally form a double-row pile structure; the pile nail comprises a precast tubular pile and a framework nested in the precast tubular pile, and the precast tubular pile and the framework are cast into a whole by concrete on the side slope site; and a sand cushion layer and an undisturbed soil layer are sequentially paved on the stable soil layer.

Description

A slope reinforcement structure and construction method for rapid treatment of existing slope collapse

Technical Field

The invention relates to an existing side slope landslide reinforcement structure, in particular to a side slope reinforcement structure and a construction method for rapid treatment of existing side slope landslide.

Background technique

Slope landslides not only cause loss of life and property, but also seriously hinder safe traffic operations and damage the natural environment.

Slope collapse is related to natural factors and human behavior. For example, rainfall infiltration in natural factors can lead to poor slope drainage, and construction of structures in human behavior can easily disturb the original balance of the slope. The mechanism of slope collapse caused by these natural factors and human behavior is that on the one hand, the slope's sliding ability is increased, and on the other hand, the slope's anti-sliding ability is weakened. Therefore, in order to improve the stability of the slope, the slope's sliding force should be reduced and its anti-sliding force should be increased accordingly.

The current measures to improve slope stability include slope cutting, anti-slide pile reinforcement and prestressed anchor cable frame beam system reinforcement. For slope cutting, the purpose of reducing the downward force of the slope is achieved by reducing the slope height and slowing down the slope, thereby maintaining the stability of the slope. However, slope cutting measures require large-scale excavation of the original slope by manpower or machinery, which changes the original slope topography and damages the local ecological environment. In addition, improper construction behavior under construction disturbance during slope cutting may cause local collapse of the excavated slope, thereby causing construction safety accidents. For anti-slide pile reinforcement and prestressed anchor cable frame beam system reinforcement, artificial structures are applied to prevent the slope from sliding down, thereby improving the anti-slide ability of the slope. However, whether it is anti-slide piles or prestressed anchor cable frame beam systems, they must be excavated and constructed on the spot, and a large number of manpower or machinery are required to complete the construction, and the construction time required to effectively protect the slope is relatively long. Therefore, the anti-slide pile or prestressed anchor frame beam system reinforcement measures are not suitable for the rapid treatment of slopes that have already collapsed or are potentially prone to collapse. At the same time, the large amount of manpower and material resources required result in high construction costs for anti-slide piles and prestressed anchor frame beam system reinforcement, which also brings unstable factors to construction safety.

With the acceleration of domestic infrastructure construction, human behavior has disturbed the original slopes more, and the slope collapse problem has become more serious. In addition, with the changes in the global environment and climate, extreme weather has occurred frequently, further exacerbating the collapse of mountain slopes. In other words, the current situation of slope treatment is very severe, especially the rapid treatment of sudden collapsed or potential collapsed slopes has become an urgent need.

Summary of the invention

The technical problem to be solved by the present invention is that, in view of the shortcomings of existing methods for treating collapsed or potentially collapsed slopes, the present invention provides an easy-to-implement, fast and convenient slope reinforcement structure and construction method for quickly treating existing slope collapse.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A slope reinforcement structure for rapid treatment of existing slope collapse, comprising a slope, and at least one row of pile nail combination structures continuously arranged at a position below a potential sliding body of the slope and close to the slope foot;

The pile-nail combination structure comprises a main nail, an auxiliary nail, a left wing nail and a right wing nail which are embedded in a Y-shaped soil layer of the slope stabilization layer. The main nail is located between the auxiliary nail, the left wing nail and the right wing nail, and the main nail is connected to the auxiliary nail, the left wing nail and the right wing nail respectively through reinforced concrete connecting beams. The connecting beam between the main nail and the left wing nail forms a V-shaped angle with the connecting beam between the main nail and the right wing nail, and is arranged facing the potential sliding body of the slope. The connecting beam between the main nail and the auxiliary nail is arranged parallel to the main sliding direction of the potential sliding body of the slope, so that the main nails and the auxiliary nails of each pile-nail combination structure form a double-row pile structure as a whole;

The pile nails include prefabricated pipe piles and a frame embedded in the prefabricated pipe piles, and the prefabricated pipe piles and the frame are cast into one piece with concrete on the slope site;

A sand cushion layer and an original soil layer are laid in sequence on the stabilized soil layer.

Preferably, the left wing nail and the right wing nail are arranged symmetrically, and the V-shaped angle is between 60° and 120°.

Preferably, the length of the pile nail embedded in the stabilized soil layer is not less than 1/2 of the pile length.

Preferably, the prefabricated pipe pile is a square or round hollow steel pipe pile, and the pile end of the prefabricated pipe pile is a solid cone.

Preferably, a plurality of transverse partitions are sequentially arranged on the inner wall of the prefabricated pipe pile along the height direction of the pipe pile.

Preferably, the top of the prefabricated pipe pile is provided with a pile cap.

Preferably, the skeleton comprises a plurality of solid rods having the same length as the pile body, the top of the solid rods being connected to a U-shaped component, the U-shaped component comprising a square component having a hollow middle portion and two baffles arranged oppositely on the top surface of the square component, and when the skeleton is nested in the prefabricated pipe pile, the square component is placed on the top of the prefabricated pipe pile, and the two baffles are arranged sequentially in the main sliding direction of the potential sliding body of the slope.

Preferably, the hollow cross-section of the square component is consistent with the hollow cross-section of the prefabricated pipe pile, and the minimum thickness of the square component is consistent with the thickness of the pile wall of the prefabricated pipe pile.

Preferably, the height of the square component is the same as the height of the sand cushion layer, and the height of the baffle is consistent with the height of the connecting beam.

Based on the same inventive concept, the present invention also provides a slope reinforcement construction method for rapid treatment of existing slope landslides, which comprises the following steps:

(1) According to the requirements of the Geotechnical Engineering Investigation Code, the geology, hydrogeology and stratum distribution of the slope shall be investigated, and the possible range and size of the potential sliding body of the slope and the main sliding direction shall be analyzed;

(2) According to the design requirements of slope anti-slide piles in the Technical Code for Slope Engineering, the pile spacing is determined in combination with the size of the prefabricated pipe piles and the construction requirements. Then, based on the slope stability evaluation method recommended by the code and the safety factor required for slope stability, the specific position of the piles at the slope foot is determined, and the length of the piles embedded in the stable soil layer below the potential sliding body of the slope is calculated;

(3) The pile-nail combination structure described in any one of claims 1 to 9 is constructed starting from the stable soil around the potential sliding body on both sides of the slope and gradually moving toward the middle of the potential sliding body. The pile-nail combination structure is constructed one by one in a step-by-step manner, and the piles are arranged in the order of local excavation → positioning of pipe piles → hammering into pipe piles → placing nested skeletons in pipe piles → constructing sand cushion layers and slope drainage pipes → pouring concrete pipe piles and connecting beams → backfilling original soil. During this process, the discontinuity of the connecting beam is left in the square part of the pile, and overlapping steel bars are reserved. Then, the next pile is constructed until the construction of the row of pile-nail combination structures is completed;

(4) Displacement monitoring points are set up on the slope and piles to continuously observe the displacement changes of the slope after reinforcement, determine its stability, and evaluate the effectiveness and reliability of the pile-nail composite structure reinforcement.

The structural features of the present invention are:

(1) The pile-type reinforcement structure of the present invention adopts a "Y"-shaped arrangement and is composed of a main nail, an auxiliary nail, a left wing nail and a right wing nail. The piles are connected by a reinforced concrete connecting beam to form a whole. The main nail and the left wing nail and the right wing nail form a "V" shape. In this way, the potential sliding body of the slope can be reinforced in a larger range by exerting their synergistic and jacking effects, and the potential sliding body can be controlled in different areas. At the same time, the main nails and the auxiliary nails form double rows of piles, which greatly increases the anti-slip effect and stability of the piles;

(2) The Y-shaped pile-type reinforcement structure of the present invention is arranged at the lower part of the potential sliding body of the slope and close to the slope foot, which can play the best reinforcement role of the Y-shaped pile-type structure;

(3) In the Y-shaped pile-nail reinforcement structure of the present invention, the connecting line of the main nail and the auxiliary nail is parallel to the main sliding direction of the potential sliding body, and the left and right wing nails are symmetrically arranged, and the "V" angle formed by the two and the main nail is between 60° and 120°, which can maximize the blocking effect of the "Y"-shaped pile-nail reinforcement structure on the potential sliding body;

(4) The pile nails of the present invention are embedded in the stable soil layer below the potential sliding body, and the embedding length is not less than 1/2 of the pile length, so that the pile nails can fully exert their anti-sliding effect on the potential sliding body;

(5) Due to the anti-slip effect of the pile nails themselves and the synergistic effect of the "Y"-shaped layout, the pile nail size does not need to be too large, and can be designed as a small or micro pile to facilitate on-site mechanized construction;

(6) The pile nail of the present invention comprises a prefabricated pipe pile and a frame embedded in the prefabricated pipe pile, which can reduce the demand for manpower in on-site construction and provide convenience and guarantee for rapid and safe construction;

(7) The prefabricated pipe pile in the pile nail of the present invention is a square or round hollow steel pipe pile, and the pile end is a solid cone, so that when the pile nail is hammered in, the pile end drives the pile body to embed into the soil layer and penetrate into the stable stratum;

(8) The wall thickness of the prefabricated pipe pile in the pile nail of the present invention meets the strength requirement for the pile body to be hammered into the construction, and a transverse partition is arranged inside the pipe pile to prevent the pile body from bending and being damaged when the pipe pile is driven into the pile.

(9) The prefabricated pipe piles in the pile nails of the present invention are driven into the soil by hammering. During the hammering construction, the pile tops of the prefabricated pipe piles are equipped with pile caps, which can prevent the hammer from directly acting on the pile nails and causing damage to their strength, and evenly distribute the heavy hammer effect to the pile body and the pile end to prevent the pipe piles from being driven crooked.

(10) In the pile nail of the present invention, a framework is embedded in the prefabricated pipe pile, and the solid rods in the framework work together with the subsequently poured concrete, so that the prefabricated pipe pile and the connecting beam form a whole, thereby exerting the synergistic effect of the "Y"-shaped pile nail reinforcement structure;

(11) In the nested skeleton of the prefabricated pipe pile of the present invention, the middle hollow of the square component is consistent with the hollow shape inside the prefabricated pipe pile, the thickness (square pipe pile) or the thinnest thickness (round pipe pile) is consistent with the thickness of the pipe pile, and the height is the same as the height of the drainage sand cushion layer applied later, which facilitates the integration of the prefabricated pipe pile and the connecting beam at the top of the pile after concrete pouring, and the construction of the drainage sand cushion layer between the pile nails will not conflict with the concrete pouring of the pipe pile and the connecting beam at the top of the pile;

(12) The height of the front and rear baffles configured in the frame of the present invention is consistent with the height of the connecting beam. On the one hand, the baffles connect the prefabricated pipe piles and the connecting beam at their nodes into a whole. On the other hand, the baffles can also be used as a template when pouring the connecting beam.

(13) The characteristics of the pile nail construction process of the present invention are: local excavation at the pile nail arrangement location to the designed position of the top of the pipe pile → positioning the pipe pile and putting the pile cap on the top of the pile → hammering the pipe pile to the designed depth → removing the pile cap and inserting the nesting frame into the pipe pile → applying a drainage sand cushion layer between the pile nails → building a connecting beam construction template and tying the connecting beam steel bars → pouring concrete to make the pipe pile and the connecting beam form a whole → removing the connecting beam construction template and backfilling the original soil to the initial elevation. According to this construction process, the pile nail can quickly realize the anti-sliding effect of the potential sliding body of the slope, and achieve the purpose of overall reinforcement of the slope under the synergistic effect of the "Y" type pile nail reinforcement structure.

Compared with the prior art, the present invention has the following beneficial effects:

Aiming at the rapid treatment of collapsed or potentially collapsed slopes, the present invention has developed the "Y"-shaped pile-nail reinforcement structure as described above, and systematically proposed a "Y"-shaped layout and pile construction process of the pile-nail reinforcement structure, forming a set of "ready-to-use" and "safe and efficient" construction methods for the "Y"-shaped pile-nail reinforcement structure, thereby achieving the purpose of forming a "Y"-shaped whole with individual small or micro prefabricated piles to exert their synergistic effect to form the maximum anti-slip effect on the slope.

The method of the present invention adopts small or micro prefabricated components for construction, avoids large-scale excavation of the slope, reduces construction costs, reduces major disturbances to the original slope, achieves environmental friendliness, and can quickly, safely and effectively realize slope reinforcement and zoning management by giving full play to the synergistic effect of the "Y"-shaped pile-nail structure, which is very beneficial to the emergency treatment of unstable slopes.

The structure and method of the present invention are easy to implement, fast and convenient, safe and reliable, low in cost, high in efficiency, low in carbon and environmentally friendly, with good effects and a wide range of applications.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG. 1 is a three-dimensional structural diagram of the slope reinforcement structure of the present invention.

FIG. 2 is a plan view of the slope reinforcement structure of the present invention.

FIG. 3 is a perspective view of a Y-shaped pile structure of the present invention.

FIG. 4 is a cross-sectional view taken along line AA of FIG. 1 .

FIG. 5 is an exploded view of the square peg.

FIG. 6 is a CC cross-sectional view of a square pile.

FIG. 7 is an exploded view of a circular peg.

FIG. 8 is a DD cross-sectional view of a circular pile.

FIG. 9 is a cross-sectional view taken along line EE of the pile nail of the present invention.

Fig. 10 is a process diagram of pile construction according to an embodiment of the present invention, wherein a is local excavation at the pile arrangement location; b is positioning and hammering of the pipe pile; c is placing a skeleton into the pipe pile; d is applying a drainage sand cushion layer (including a drainage pipe); e is pouring concrete; and f is backfilling the original soil.

illustration:

1. Slope surface;

2. Slope bottom;

3. Slope top surface;

4. Potential sliding body;

5. Main sliding direction of potential sliding body;

6. Pile-nail combination structure;

7. Main nail;

8. Auxiliary nails;

9. Left wing nail;

10. Right wing nail;

11. Connecting beam;

12. Sand cushion layer;

13. Original soil layer;

14. Pipe piles;

15. Pile cap;

16. Skeleton;

17. Pipe pile body;

18. Pipe pile end;

19. Pipe pile wall;

20. Horizontal partition.

Detailed ways

The present invention is further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

For the convenience of description, the relative position relationship of each component, such as up, down, left, right, etc., is described according to the layout direction of the drawings in the specification, and does not limit the structure of this patent.

As shown in FIG. 1 to FIG. 3 , an embodiment of a slope reinforcement structure for rapid treatment of existing slope collapse of the present invention comprises:

At least one row of pile assembly structures 6 is continuously arranged at a position below the potential sliding body 4 of the slope and close to the slope foot;

The pile-nail combination structure 6 includes a main nail 7, an auxiliary nail 8, a left wing nail 9 and a right wing nail 10 embedded in the slope stabilizing soil layer in a Y shape. The main nail 7 is located between the auxiliary nail 8, the left wing nail 9 and the right wing nail 10, and the main nail 7 is connected to the auxiliary nail 8, the left wing nail 9 and the right wing nail 10 through a reinforced concrete connecting beam 11. The left wing nail 9 and the right wing nail 10 are symmetrically arranged on both sides of the main nail 7, and a V-shaped angle of 60° to 120° is formed between the connecting beam 11 connecting the main nail 7 and the left wing nail 9 and the connecting beam 11 connecting the main nail 7 and the right wing nail 10, and the V-shaped angle is arranged facing the potential sliding body 4 of the slope. The connecting beam 11 between the main nail 7 and the auxiliary nail 8 is arranged parallel to the main sliding direction 5 of the potential sliding body of the slope, so that the main nails 7 and the auxiliary nails 8 of each pile-nail combination structure 6 form a double-row pile structure as a whole;

A drainage sand cushion layer 12 and an original soil layer 13 are laid in sequence on the stabilized soil layer.

In order to give full play to the anti-slip effect of the pile nails on the potential sliding body 4 of the slope, the length of the pile nails embedded in the stable soil layer is not less than 1/2 of the pile length.

As shown in FIG. 4 to FIG. 9 , the pile nail includes a prefabricated pipe pile 14 and a skeleton 16 embedded in the prefabricated pipe pile 14 , and the prefabricated pipe pile 14 and the skeleton 16 are cast into one piece with concrete on the slope site.

The prefabricated pipe pile 14 is a square or round hollow steel pipe pile, and the pile end 18 of the prefabricated pipe pile 14 is a solid cone. A plurality of transverse partitions 20 are sequentially arranged on the inner wall of the prefabricated pipe pile 14 along the height direction of the pipe pile. The pile top of the prefabricated pipe pile 14 is provided with a pile cap 15.

The skeleton 16 includes a plurality of solid rods of the same length as the pile body (here, the pile body is the height of the pile body 17 and the square component), and the top of the solid rod is connected to a U-shaped component, and the U-shaped component includes a square component with a hollow center and two baffles arranged on the top surface of the square component. When the skeleton 16 is nested in the prefabricated pipe pile 14, the square component is placed on the top of the prefabricated pipe pile 14, and the two baffles are arranged in sequence in the main sliding direction 5 of the potential sliding body of the slope.

In order to maintain the uniform strength of the pile nail over its entire length, the hollow section of the square component is consistent with the hollow section of the prefabricated pipe pile 14 , and the minimum thickness of the square component is consistent with the thickness of the pipe pile wall 19 of the prefabricated pipe pile 14 .

To facilitate the installation of the sand cushion layer 12 and the drainage pipe, the height of the square component is the same as the height of the sand cushion layer 12 .

The height of the baffle is consistent with the height of the connecting beam. In this way, the prefabricated pipe pile 14 and the connecting beam 11 can be connected as a whole at their nodes through the baffle, and the baffle can also be used as a template when the connecting beam 11 is poured.

In order to verify the reinforcement effect of the slope reinforcement structure of the present invention for rapid treatment of existing slope collapse, the inventors of the present application conducted the following experiments:

A residual soil slope with a height of about 40 meters and a slope angle of about 35° is selected, and shallow landslides have occurred in this slope due to human disturbance and long-term rainfall. In order to prevent the further expansion of the instability range of the slope and to ensure the safety of people's lives and property and the normal operation of traffic within the range of slope sliding damage, it is planned to reinforce the slope. The slope reinforcement treatment measures should ensure effectiveness and ensure that the construction disturbance of the reinforcement treatment measures is within a reasonable range and will not cause the slope to become unstable again. For this reason, the slope reinforcement structure of the present invention for rapid treatment of existing slope landslides is adopted. The piles are hammered into the construction using small prefabricated pipe piles, and there is no need to dig the slope. At the same time, the pile-nail combination structure 6 approaches the unstable soil body in the middle from the stable soil body on both sides of the potential sliding body 4 of the slope. The completed piles on both sides can constrain the potential sliding body of the slope, providing safety for the construction of the unstable soil body in the middle. In addition, the construction of prefabricated parts can quickly form an effective anti-slip effect on the slope, and utilize the synergy and row effect of the pile-nail combination structure 6 to construct a favorable reinforcement system, so that the construction disturbance of the reinforcement treatment measures is controlled within a reasonable range.

The specific operations are as follows:

(1) According to the requirements of the Code for Geotechnical Engineering Investigation (GB 50021-2001), the geology, hydrogeology and stratum distribution of the slope shall be investigated, and the possible range and size of the potential sliding body of the slope and the main sliding direction shall be analyzed;

(2) According to the design requirements of slope anti-slide piles in the Technical Code for Slope Engineering (GB 50330-2013), the pile spacing is determined in combination with the size of the prefabricated piles and the construction requirements. Then, based on the slope stability evaluation method recommended by the code and the safety factor required for slope stability, the specific position of the "Y"-shaped pile reinforcement structure (pile combination structure 6) at the slope foot is determined, and the required length of the pile embedded in the stable soil layer below the potential sliding body 4 is calculated;

(3) The Y-shaped pile-nail reinforcement structure is constructed starting from the stable soil around the potential sliding body on both sides of the slope and gradually moving toward the middle of the potential sliding body. A step-by-step construction method is adopted (i.e., one Y-shaped pile-nail reinforcement structure is completed before the next Y-shaped pile-nail reinforcement structure is constructed). The piles are arranged according to the pile-nail construction process, as shown in Figure 10: local excavation → pipe pile positioning → hammering into the pipe pile → inserting the nested skeleton into the pipe pile → constructing the sand cushion layer and slope drainage pipe → pouring concrete pipe piles and connecting beams → backfilling the original soil;

(4) The discontinuity of the coupling beam in the “Y” type pile-nail reinforcement structure (i.e. the construction joint formed by the non-continuous pouring of the coupling beam concrete) is left in the pile, and the lap steel bars are reserved, and then the next pile construction is continued until the row of “Y” type pile-nail reinforcement structures is completed;

(5) After the construction of the row "Y"-shaped pile-type reinforcement structure is completed, displacement monitoring points are set up on the slope and the piles to continuously observe the displacement changes of the slope after reinforcement, determine its stability, and evaluate the effectiveness and reliability of the "Y"-shaped pile-type structure reinforcement.

The above is only a specific implementation scheme of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the art can make many possible changes and modifications to the technical scheme of the present invention by using the technical content disclosed above without departing from the scope of the technical scheme of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical scheme of the present invention should fall within the protection scope of the technical scheme of the present invention.

Claims (7)

1. A slope reinforcement structure for rapid treatment of existing slope collapse, comprising a slope, characterized in that: at least one row of pile assembly structures is continuously arranged at a position below a potential sliding body of the slope and close to the slope foot; The pile-nail combination structure comprises a main nail, an auxiliary nail, a left wing nail and a right wing nail which are embedded in a Y-shaped soil layer of the slope stabilization layer. The main nail is located between the auxiliary nail, the left wing nail and the right wing nail. The left wing nail and the right wing nail are symmetrically arranged on both sides of the main nail. The main nail is connected to the auxiliary nail, the left wing nail and the right wing nail respectively through reinforced concrete connecting beams. The connecting beam between the main nail and the left wing nail forms a V-shaped angle of 60° to 120° with the connecting beam between the main nail and the right wing nail, and is arranged facing the potential sliding body of the slope. The connecting beam between the main nail and the auxiliary nail is arranged parallel to the main sliding direction of the potential sliding body of the slope, so that the main nails and the auxiliary nails of each pile-nail combination structure form a double-row pile structure as a whole; The pile nail comprises a prefabricated pipe pile and a frame embedded in the prefabricated pipe pile, the frame comprises a plurality of solid rods of the same length as the pile body, the top of the solid rods is connected to a U-shaped component, the U-shaped component comprises a square component with a hollow middle portion and two baffles arranged oppositely on the top surface of the square component, when the frame is embedded in the prefabricated pipe pile, the square component is placed on the top of the prefabricated pipe pile, the two baffles are arranged in sequence in the main sliding direction of the potential sliding body of the slope, and the prefabricated pipe pile and the frame are cast into one piece with concrete on site at the slope; A sand cushion layer and an original soil layer are sequentially laid on the stabilized soil layer; The length of the pile nail embedded in the stable soil layer is not less than 1/2 of the pile length. 2. The slope reinforcement structure for rapid treatment of existing slope landslides according to claim 1 is characterized in that the prefabricated pipe piles are square or circular hollow steel pipe piles, and the pile ends of the prefabricated pipe piles are solid cones. 3. The slope reinforcement structure for rapid treatment of existing slope landslides according to claim 2 is characterized in that a plurality of transverse partitions are sequentially arranged on the inner wall of the prefabricated pipe pile along the height direction of the pipe pile. 4. The slope reinforcement structure for rapid treatment of existing slope landslides according to claim 2, characterized in that the top of the prefabricated pipe pile is equipped with a pile cap. 5. The slope reinforcement structure for rapid treatment of existing slope landslides according to claim 1 is characterized in that the hollow cross-section of the square component is consistent with the hollow cross-section of the prefabricated pipe pile, and the minimum thickness of the square component is consistent with the pile wall thickness of the prefabricated pipe pile. 6. The slope reinforcement structure for rapid treatment of existing slope landslides according to claim 1 is characterized in that the height of the square component is the same as the height of the sand cushion layer, and the height of the baffle is consistent with the height of the connecting beam. 7. A slope reinforcement construction method for rapid treatment of existing slope collapse, characterized by comprising the following steps: (1) According to the requirements of the Geotechnical Engineering Investigation Code, the geology, hydrogeology and stratum distribution of the slope shall be investigated, and the possible range and size of the potential sliding body of the slope and the main sliding direction shall be analyzed; (2) According to the design requirements of slope anti-slide piles in the Technical Code for Slope Engineering, the pile spacing is determined in combination with the size of the prefabricated pipe piles and the construction requirements. Then, based on the slope stability evaluation method recommended by the code and the safety factor required for slope stability, the specific position of the piles at the slope foot is determined, and the length of the piles embedded in the stable soil layer below the potential sliding body of the slope is calculated; (3) The slope reinforcement structure described in any one of claims 1 to 6 is constructed starting from the stable soil around the potential sliding body on both sides of the slope and gradually moving toward the middle of the potential sliding body, and the pile-nail combination structure is constructed step by step. The piles are arranged in the order of local excavation → positioning of pipe piles → hammering into pipe piles → placing nested skeletons in pipe piles → constructing sand cushion layers and slope drainage pipes → pouring concrete pipe piles and connecting beams → backfilling with original soil. During this process, the discontinuity of the connecting beam is left in the square part of the pile, and overlapping steel bars are reserved. Then, the next pile is constructed until the construction of the row of pile-nail combination structures is completed; (4) Displacement monitoring points are set up on the slope and piles to continuously observe the displacement changes of the slope after reinforcement, determine its stability, and evaluate the effectiveness and reliability of the pile-nail composite structure reinforcement.