Excavation Method of Anti-Sliding Piles near Existing Highways

Abstract

The present invention discloses a method for excavating anti-slide piles adjacent to an existing highway. One side of the existing highway is provided with an existing slope, and a plurality of sequentially arranged areas to be excavated are provided on the existing slope. The first to-be-excavated section and the second to-be-excavated section are continuously arranged in the vertical direction in each area to be excavated. The method includes: excavating in the current area to be excavated to form a current pile hole; excavating in a target area to be excavated that is at least two areas to be excavated away from the current area to be excavated to form a target pile hole. By excavating in the current area to be excavated and the target area to be excavated that is at least two areas to be excavated away from the current area to be excavated, the present invention reduces the disturbance to the slope soil body, prevents the slope soil body from sliding down to the adjacent existing highway, reduces the traffic impact of the anti-slide pile construction on the existing highway, and moreover, uses the first to-be-excavated section to guide the construction of the second to-be-excavated section, improving the hole-forming quality of the anti-slide pile.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-slide pile excavation construction adjacent to an existing highway, and particularly relates to a method for excavating an anti-slide pile adjacent to an existing highway. Background Art

[0002] An anti-slide pile is a pile column that penetrates through a landslide body and extends deep into the sliding bed, used to resist the sliding force of the landslide body and play a role in stabilizing the slope. It is applicable to shallow and medium-thick landslides and is a main measure for anti-slide treatment.

[0003] The role of the anti-slide pile on the landslide body is to utilize the resistance (anchoring force) of the stable formation below the sliding surface inserted by the anti-slide pile to balance the thrust of the sliding body and increase its stability. When the landslide body slides down, it is resisted by the anti-slide pile, making the sliding body in front of the pile reach a stable state. According to the thickness of the sliding body, the magnitude of the thrust, waterproof requirements, construction conditions, etc., wooden piles, steel piles, concrete and reinforced concrete piles are selected. The depth of the anti-slide pile buried below the formation, according to general experience, the anchoring depth in soft rock formations is one-third of the designed pile length; in hard rock formations, it is one-fourth of the designed pile length; in soil sliding beds, it is one-half of the designed pile length. When the soil layer slides along the bedrock surface, the anchoring depth is also sometimes taken as 2 - 5 times the pile diameter. The layout forms of anti-slide piles include interconnected pile rows, mutually spaced pile rows, pile rows with intervals at the lower part and connections at the top, mutually spaced anchoring piles, etc. The spacing between pile columns generally takes 3 - 5 times the pile diameter, with the principle of ensuring that the sliding soil mass does not slide out between the piles.

[0004] However, when constructing anti-slide piles on the slope adjacent to an existing highway, the construction efficiency of the existing conventional construction technology is relatively low, the occupation time of the existing highway is relatively long, resulting in a greater impact on the existing highway, and during construction, the vibration generated is likely to cause the soil mass on the slope to slide, creating potential safety hazards. Summary of the Invention

[0005] The main purpose of the present invention is to provide a method for excavating an anti-slide pile adjacent to an existing highway, aiming to solve the technical problems in the existing technology that when constructing anti-slide piles on the slope adjacent to an existing highway, the construction efficiency of the existing conventional construction technology is relatively low, the occupation time of the existing highway is relatively long, resulting in a greater impact on the existing highway, and during construction, the vibration generated is likely to cause the soil mass on the slope to slide, creating potential safety hazards.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a method for excavating an anti-slide pile adjacent to an existing highway. On one side of the existing highway, there is an existing slope, and on the existing slope, there are multiple sequentially arranged areas to be excavated. In each area to be excavated, a first section to be excavated and a second section to be excavated are continuously arranged in the vertical direction;

[0008] The method includes:

[0009] Excavate in the current area to be excavated to form the current pile hole;

[0010] Excavate in a target area to be excavated that is at least two areas to be excavated away from the current area to be excavated to form a target pile hole;

[0011] The step of excavating in the current area to be excavated to form the current pile hole includes:

[0012] Excavate the first section to be excavated to form the first section to be formed into a hole;

[0013] Form a first pile hole of the anti-slide pile by forming a hole in the first section to be formed into a hole;

[0014] Use the first pile hole for guiding, excavate the second section to be excavated to form the second section to be formed into a hole;

[0015] Use a square-hole type grooving machine to form a hole in the second section to be formed into a hole to form a second pile hole communicating with the first pile hole, and obtain the current pile hole.

[0016] Optionally, in the above method for excavating an anti-slide pile adjacent to an existing highway, before the step of excavating in a target area to be excavated that is at least two areas to be excavated away from the current area to be excavated to form a target pile hole, the method further includes:

[0017] Pour concrete into the current pile hole to form the current pile foundation;

[0018] Obtain the concrete strength of the current pile foundation;

[0019] Judge whether the concrete strength of the current pile foundation meets a preset condition;

[0020] If so, excavate the target area to be excavated to form the target pile hole.

[0021] Optionally, in the above method for excavating an anti-slide pile adjacent to an existing highway, the step of judging whether the concrete strength of the current pile foundation meets a preset condition includes:

[0022] Judge whether the concrete strength of the current pile foundation is greater than or equal to 75%;

[0023] If so, the concrete strength of the current pile foundation meets the preset condition.

[0024] Optionally, in the above method for excavating an anti-slide pile adjacent to an existing highway, the step of using the first pile hole for guiding, excavating the second section to be excavated to form the second section to be formed into a hole includes:

[0025] Determine whether the inner wall of the first pile hole has collapsed;

[0026] If so, backfill the soil in the first pile hole to form a backfill layer that seals the first pile hole;

[0027] Re-excavate the backfill layer to form the first pile hole again.

[0028] Optionally, in the anti-slide pile excavation method adjacent to the existing highway described above, the step of re-excavating the backfill layer to form the first pile hole again includes:

[0029] Excavate the backfill layer to form a hole wall;

[0030] Temporarily support the hole wall to form a retaining wall;

[0031] Continue to excavate the backfill layer using the retaining wall until the first pile hole is formed.

[0032] Optionally, in the anti-slide pile excavation method adjacent to the existing highway described above, the step of temporarily supporting the hole wall to form a retaining wall includes:

[0033] Set wooden piles in the area adjacent to the first pile hole on the existing slope;

[0034] Carry out support in the area of the first pile hole to form a top support structure, and connect the top support structure to the wooden piles to form the retaining wall.

[0035] Optionally, in the anti-slide pile excavation method adjacent to the existing highway described above, after forming the top support structure by carrying out support in the area of the first pile hole and connecting the top support structure to the wooden piles to form the retaining wall, the method further includes:

[0036] Reinforce the bars in the area corresponding to the excavated backfill soil;

[0037] Use the reinforced bars to set a dense reinforcement cage covering the inner side wall of the first hole section to be formed;

[0038] Connect the dense reinforcement cage to the bottom end of the retaining wall;

[0039] Use the dense reinforcement cage and the retaining wall to excavate the second section to be excavated to form the second hole section to be formed.

[0040] Optionally, in the anti-slide pile excavation method adjacent to the existing highway described above, the step of using the dense reinforcement cage and the retaining wall to excavate the second section to be excavated to form the second hole section to be formed includes:

[0041] Excavate the second section to be excavated by using the encrypted reinforcement cage and the retaining wall to form a second section to be drilled

[0042] Press concrete into the second section to be drilled to form a temporary support structure covering the inner side wall of the second section to be drilled.

[0043] Optionally, in the above anti-slide pile excavation method adjacent to the existing highway, the step of pressing concrete into the second section to be drilled to form a temporary support structure covering the inner side wall of the second section to be drilled includes:

[0044] Press any one of fly ash, early-strength cement concrete or lime-clay mixture into the second section to be drilled to form the temporary support structure.

[0045] Optionally, in the above anti-slide pile excavation method adjacent to the existing highway, the diameter of the first section to be excavated is A, and the diameter of the second section to be excavated is B, where A≥B + 20 cm.

[0046] One or more of the above technical solutions provided by the present invention may have the following advantages or at least achieve the following technical effects:

[0047] An anti-slide pile excavation method adjacent to an existing highway proposed by the present invention, by excavating in the current area to be excavated and the target area to be excavated that is at least two areas to be excavated away from the current area to be excavated, during the excavation of the anti-slide pile, the disturbance to the slope soil body is reduced, preventing the slope soil body from sliding down to the adjacent existing highway, reducing the traffic impact of the anti-slide pile construction on the existing highway, and, forming holes in the first section to be excavated and the second section to be excavated in batches, using the first section to be excavated to guide the hole-forming construction of the second section to be excavated, improving the hole-forming quality of the anti-slide pile hole. Use a square-hole grooving machine to form a hole in the second section to be excavated so that the formed square pile hole is surrounded by the inner side wall of the first section to be excavated. After setting a locking plate between the first pile hole and the second pile hole, a stable base is provided for the locking plate to improve the construction quality of the exposed part of the anti-slide pile using the locking plate later, and ensure the forming effect of the anti-slide pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these provided drawings.

[0049] Figure 1 It is a schematic flow chart of the anti-slide pile excavation method adjacent to the existing highway of the present invention;

[0050] Figure 2 is Figure 1 a detailed process schematic diagram of step S100 in

[0051] Figure 3 is Figure 1 a detailed process schematic diagram before step S200 in

[0052] Figure 4 is Figure 3 a detailed process schematic diagram of step S203 in

[0053] Figure 5 is Figure 2 a detailed process schematic diagram of step S130 in

[0054] Figure 6 is Figure 5 a detailed process schematic diagram of step S133 in

[0055] Figure 7 is Figure 6 a detailed process schematic diagram of step D200 in

[0056] Figure 8 is Figure 7 a detailed process schematic diagram of step D210 in

[0057] The realization, functional features, and advantages of the object of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific Embodiments

[0058] To make the object, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0059] It should be noted that in the embodiments of the present invention, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0060] In the present invention, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or system comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "comprising..." does not exclude the presence of additional identical elements in the process, method, article or system comprising that element. Additionally, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously.

[0061] In the present invention, unless otherwise expressly specified and defined, terms such as "connect" and "fix" shall be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements.

[0062] In the present invention, if there are descriptions involving "first", "second", etc., such descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may expressly or implicitly include at least one such feature.

[0063] In the present invention, suffixes such as "module", "component", "part", "sub-component" or "unit" used to represent elements are only for the convenience of explaining the present invention and have no specific meaning in themselves. Therefore, "module", "part" or "unit" can be used interchangeably.

[0064] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Additionally, the technical solutions of each embodiment can be combined with each other, provided that it is based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0065] The inventive concept of the present invention will be further elaborated below in conjunction with some specific embodiments.

[0066] The present invention provides an excavation method for anti-slide piles adjacent to an existing highway.

[0067] Refer to Figure 1 and Figure 2 , Figure 1Schematic flow chart of the excavation method of anti-slide piles adjacent to existing roads according to the present invention; Figure 2 is Figure 1 detailed flow chart of step S100 in

[0068] In an embodiment of the present invention, as Figure 1 and Figure 2 shown, an existing slope is provided on one side of the existing road, and a plurality of sequentially arranged to-be-excavated areas are provided on the existing slope. A first to-be-excavated section and a second to-be-excavated section are continuously arranged in the vertical direction in each to-be-excavated area;

[0069] The excavation method of anti-slide piles adjacent to existing roads includes:

[0070] Step S100: Excavate in the current to-be-excavated area to form the current pile hole;

[0071] Step S200: Excavate in the target to-be-excavated area that is at least two to-be-excavated areas away from the current to-be-excavated area to form the target pile hole;

[0072] The steps of excavating in the current to-be-excavated area to form the current pile hole include:

[0073] Step S110: Excavate the first to-be-excavated section to form the first to-be-formed hole section;

[0074] Step S120: Drill a hole in the first to-be-formed hole section to form the first pile hole of the anti-slide pile;

[0075] Step S130: Use the first pile hole for guiding, excavate the second to-be-excavated section to form the second to-be-formed hole section;

[0076] Step S140: Use a square-hole type grooving machine to drill a hole in the second to-be-formed hole section to form a second pile hole communicating with the first pile hole, and obtain the current pile hole.

[0077] For easy understanding, a specific embodiment is shown below:

[0078] In steps S100 to S200, the anti-slide piles are mechanically excavated to the shoulder elevation, and then a square-hole type grooving machine is used to drill the holes. The pile foundation excavation should skip two holes for excavation, and the adjacent holes can only be excavated after the concrete strength of the pile foundation reaches 75%. Considering that the construction of this section of anti-slide piles is within the operation range of the existing expressway, only the third lane and the emergency lane are blocked during the construction period.

[0079] In steps S110 to S140, since geological drilling is not carried out for each anti-slide pile, in case of special geology, artificial construction with a retaining wall is adopted. When construction problems, geological problems or environmental problems cause mechanical hole drilling to be impossible on site, the construction method is changed in time, and the drilled part is backfilled and the artificial construction with a retaining wall is adopted again.

[0080] After the first pile hole and the second pile hole are formed, since the inner diameter of the first pile hole is larger than that of the second pile hole, the bottom end of the first pile hole surrounds the top end of the second pile hole, and a locking plate is arranged at the top end of the second pile hole to improve the stability of the locking plate and facilitate the subsequent construction of the exposed part of the anti-slide pile by using the locking plate.

[0081] It can be understood that after the hole-forming end of the square-hole grooving machine extends into the first pile hole, the inner side wall of the first pile hole contacts the outer wall of the output end of the square-hole grooving machine, thereby limiting the output shaft of the square-hole grooving machine.

[0082] The technical solution of the present invention reduces the disturbance to the slope soil body during the excavation of the anti-slide pile by excavating in the current area to be excavated and the target area to be excavated that is at least two areas to be excavated away from the current area to be excavated, prevents the slope soil body from sliding down to the adjacent existing road, and reduces the traffic impact of the anti-slide pile construction on the existing road. Moreover, the first section to be excavated and the second section to be excavated are formed into holes in sequence, and the hole-forming construction of the second section to be excavated is guided by the first section to be excavated, improving the hole-forming quality of the pile hole of the anti-slide pile. The second section to be excavated is formed into a hole by using a square-hole grooving machine so that the formed square pile hole is surrounded by the inner side wall of the first section to be excavated. After a locking plate is arranged between the first pile hole and the second pile hole, a stable base is provided for the locking plate to improve the construction quality of the subsequent construction of the exposed part of the anti-slide pile by using the locking plate and ensure the forming effect of the anti-slide pile.

[0083] Refer to Figure 3 , Figure 3 For Figure 1 the detailed process schematic diagram before step S200 in

[0084] In one embodiment, as Figure 3 shown, before the step of excavating in the target area to be excavated that is at least two areas to be excavated away from the current area to be excavated to form the target pile hole, the anti-slide pile excavation method adjacent to the existing road further includes:

[0085] Step S201: Pour concrete into the current pile hole to form the current pile foundation;

[0086] Step S202: Obtain the concrete strength of the current pile foundation;

[0087] Step S203: Determine whether the concrete strength of the current pile foundation meets the preset conditions;

[0088] Step S204: If so, excavate the target area to be excavated to form the target pile hole.

[0089] Refer to Figure 4 , Figure 4 For Figure 3Schematic diagram of the refined process of step S203

[0090] In one embodiment, as Figure 4 shown, the steps of determining whether the concrete strength of the current pile foundation meets the preset conditions include:

[0091] Step A100: To further reduce the disturbance to the slope soil mass during the excavation of the target area to be excavated, determine whether the concrete strength of the current pile foundation is greater than or equal to 75%. That is, when the concrete strength of the current pile foundation is greater than or equal to 75%, the concrete base in the current pile hole supports the inner wall soil mass in the current pile hole, thereby improving the anti-disturbance ability of the slope soil mass;

[0092] Step A200: If so, the concrete strength of the current pile foundation meets the preset conditions.

[0093] Refer to Figure 5 , Figure 5 For Figure 2 schematic diagram of the refined process of step S130 in

[0094] In one embodiment, as Figure 5 shown, the steps of using the first pile hole for guidance and excavating the second section to be excavated to form the second section to be formed into a hole include:

[0095] Step S131: Determine whether the inner wall of the first pile hole has collapsed;

[0096] Step S132: If so, backfill the soil mass in the first pile hole to form a backfill layer that seals the first pile hole;

[0097] Step S133: Re-excavate the backfill layer to form the first pile hole again to prevent the first pile hole formed by the original excavation from continuing to collapse, thereby reducing potential safety hazards.

[0098] Refer to Figure 6 , Figure 6 For Figure 5 schematic diagram of the refined process of step S133 in

[0099] In one embodiment, as Figure 6 shown, the steps of re-excavating the backfill layer to form the first pile hole again include:

[0100] Step D100: Excavate the backfill layer to form a hole wall;

[0101] Step D200: Carry out temporary support on the hole wall to form a retaining wall;

[0102] Step D300: Use the retaining wall to continue excavating the backfill layer until the first pile hole is formed.

[0103] Refer to Figure 7 ,Figure 7 For Figure 6 the detailed process schematic diagram of step D200 in

[0104] In one embodiment, as Figure 7 shown, the steps of temporarily supporting the hole wall to form a retaining wall include:

[0105] Step D210: Set wooden stakes in the area adjacent to the first pile hole on the existing slope;

[0106] Step D220: Support the area of the first pile hole to form a top support structure, and connect the top support structure to the wooden stakes to form a retaining wall.

[0107] Specifically, for the top retaining wall, use round steel with a diameter of 20 cm and add 2 - 4 lifting lugs, and fix it to the ground wooden stakes with steel wire ropes; densify the vertical steel bars of the retaining wall, and let the steel bars extend more than 20 cm, and connect them integrally with the vertical steel bars and stirrups of the next section of the retaining wall, and then pour and form. If necessary, a hole with a diameter of about 200 mm can be reserved on the middle retaining wall of the dug pile, but the geology of this part should be selected as relatively hard soil, and then anchor the retaining wall to the soil outside the retaining wall, and concrete piles or bamboo and wooden piles can be used. In this way, the retaining wall will not break and fall off; drill holes on the formed retaining wall to the weak sand layer, and fill the grouting material into the pores of the soil in the form of filling, infiltration and compaction to consolidate the soil outside the retaining wall and protect the mud and sand around the retaining wall from collapsing, so as to increase the friction force around the pile. The pressure grouting material can be selected from fly ash, early-strength cement concrete, lime-clay mixture, etc. to form the final retaining wall.

[0108] Refer to Figure 8 , Figure 8 For Figure 7 the detailed process schematic diagram of step D210 in

[0109] In one embodiment, as Figure 8 shown, after supporting the area of the first pile hole to form a top support structure and connecting the top support structure to the wooden stakes to form a retaining wall, the anti-slide pile excavation method adjacent to the existing road further includes:

[0110] Step D211: Reinforce the bars in the area corresponding to the excavated backfill soil;

[0111] Step D212: Use the reinforced bars to set a densified steel cage covering the inner side wall of the first to-be-formed hole section;

[0112] Step D213: Connect the densified steel cage to the bottom end of the retaining wall;

[0113] Step D214: Use the densified steel cage and the retaining wall to excavate the second to-be-excavated section to form the second to-be-formed hole section.

[0114] In one embodiment, the steps of using a reinforced steel cage and a retaining wall to excavate a second section to be excavated to form a second section to be drilled include:

[0115] Step F100: Use a reinforced steel cage and a retaining wall to excavate a second section to be excavated to form a second section to be drilled;

[0116] Step F200: Press concrete into the second section to be drilled to form a temporary support structure covering the inner sidewall of the second section to be drilled.

[0117] In one embodiment, the steps of pressing concrete into the second section to be drilled to form a temporary support structure covering the inner sidewall of the second section to be drilled include:

[0118] Step F210: Press any one of fly ash, early-strength cement concrete or lime-clay mixture into the second section to be drilled to form a temporary support structure.

[0119] In one embodiment, after the soil in the first section to be excavated is excavated, in order to facilitate the rebar planting operation on the inner sidewall of the first section to be drilled, to facilitate the rebar planting on the inner wall of the first section to be drilled, to reserve a construction operation surface for the construction operation of rebar planting, and to ensure the length of the rebar so that the rebar can be connected to the subsequent reinforced steel cage as a whole, the diameter of the first section to be excavated is A, and the diameter of the second section to be excavated is B, where A ≥ B + 20 cm.

[0120] It should be noted that the serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments. The above embodiments are only optional embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or directly or indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for excavating anti-slide piles adjacent to an existing highway, characterized in that, On one side of the existing road, there is an existing slope, and multiple sequentially arranged areas to be excavated are provided on the existing slope. In each area to be excavated, a first section to be excavated and a second section to be excavated are continuously arranged in the vertical direction; The method includes: Excavate in the current area to be excavated to form a current pile hole; Excavate in a target area to be excavated that is at least two areas to be excavated away from the current area to be excavated to form a target pile hole; The step of excavating in the current area to be excavated to form a current pile hole includes: Excavate the first section to be excavated to form a first section to be formed into a hole; Form a first pile hole of the anti-slide pile by forming a hole in the first section to be formed into a hole; Use the first pile hole for guiding, and excavate the second section to be excavated to form a second section to be formed into a hole; Use a square-hole type grooving machine to form a hole in the second section to be formed into a hole to form a second pile hole communicating with the first pile hole, and obtain the current pile hole.

2. The anti-slide pile excavation method adjacent to an existing highway according to claim 1, characterized in that, Before the step of excavating in a target area to be excavated that is at least two areas to be excavated away from the current area to be excavated to form a target pile hole, the method further includes: Pour concrete into the current pile hole to form a current pile foundation; Obtain the concrete strength of the current pile foundation; Judge whether the concrete strength of the current pile foundation meets a preset condition; If so, excavate the target area to be excavated to form the target pile hole.

3. The anti-slide pile excavation method near an existing highway according to claim 2, characterized in that, The step of judging whether the concrete strength of the current pile foundation meets a preset condition includes: Judge whether the concrete strength of the current pile foundation is greater than or equal to 75%; If so, the concrete strength of the current pile foundation meets the preset condition.

4. The anti-slide pile excavation method adjacent to an existing highway according to claim 1, characterized in that, The step of using the first pile hole for guiding and excavating the second section to be excavated to form a second section to be formed into a hole includes: Judge whether the inner wall of the first pile hole collapses; If so, backfill the soil body in the first pile hole to form a backfill layer that seals the first pile hole; Re-excavate the backfill layer to form the first pile hole again.

5. The anti-slide pile excavation method near an existing highway according to claim 4, characterized in that, The step of re-excavating the backfill layer to form the first pile hole again includes: Excavate the backfill layer to form a hole wall; Temporarily support the hole wall to form a retaining wall; Continue to excavate the backfill layer using the retaining wall until the first pile hole is formed.

6. The anti-slide pile excavation method near an existing highway as described in claim 5, characterized in that, The step of temporarily supporting the hole wall to form a retaining wall includes: Set wooden stakes in the area adjacent to the first pile hole on the existing slope; Carry out support in the area of the first pile hole to form a top support structure, and connect the top support structure to the wooden stakes to form the retaining wall.

7. The anti-slide pile excavation method near an existing highway according to claim 6, characterized in that, After forming the top support structure in the area of the first pile hole and connecting the top support structure to the wooden stakes to form the retaining wall, the method further includes: Reinforce bars are planted in the area corresponding to the excavated backfill soil; Use the reinforced bars to set a reinforced steel cage covering the inner side wall of the first section to be formed into a hole; Connect the reinforced steel cage to the bottom end of the retaining wall; Use the reinforced steel cage and the retaining wall to excavate the second section to be excavated to form a second section to be formed into a hole.

8. The anti-slide pile excavation method adjacent to an existing highway according to claim 7, characterized in that, The step of excavating the second section to be excavated by using the encrypted reinforcement cage and the retaining wall to form the second section to be bored includes: Excavating the second section to be excavated by using the encrypted reinforcement cage and the retaining wall to form the second section to be bored; Pressing concrete into the second section to be bored to form a temporary support structure covering the inner side wall of the second section to be bored.

9. The anti-slide pile excavation method near an existing highway according to claim 8, characterized in that, The step of pressing concrete into the second section to be bored to form a temporary support structure covering the inner side wall of the second section to be bored includes: Pressing any one of fly ash, early-strength cement concrete or lime-clay mixture into the second section to be bored to form the temporary support structure.

10. The anti-slide pile excavation method near an existing highway according to any one of claims 1 to 9, characterized in that, The diameter of the first section to be excavated is A, and the diameter of the second section to be excavated is B, where A ≥ B + 20 cm.

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