CN114250774B - Device for dismantling pile foundation near existing high-speed rail station house and construction method - Google Patents

Abstract

The invention relates to the technical field of pile extraction, in particular to an existing pile foundation removal device and construction method near a high-speed railway station building, including a removal device, and the removal device includes a drilling casing for an external drilling rig, a reinforcement protection component and a stripping component. The stripping assembly includes the inserting cones that are vertically inserted into the drilling casing and are distributed in a circular array and the base swivel assembled on the bottom surface of the drilling casing. Through the cooperation of the inserting cone and the positioning cone, the positioning cone is inserted horizontally into the stripped rock layer through vertical extrusion to form a lateral clamping force, thereby reducing the connection strength of the pile base and improving the clamping force. Holding force, easy to twist off and pull out.

Description

A pile foundation demolition device and construction method near the existing high-speed railway station building

technical field

The invention relates to the technical field of pile extraction, in particular to a device and construction method for removing pile foundations near existing high-speed railway station buildings.

Background technique

Part of the newly-built enclosure piles and ground-connected wall structures overlap with the existing old enclosure piles and old engineering piles, and need to be pulled out to seal the holes, and the underground pressure head is high, and the construction is close to the high-speed railway station building, so the project safety risk is high. In order to ensure that the normal operation of the high-speed railway station building will not be affected during the pile extraction construction, and to ensure that the ground connection wall and surrounding piles will not collapse during the groove construction in the later stage, and to meet the stability of the confined water, the existing pile foundation needs to be sealed immediately after the pile is pulled out. , Pile hole backfilling material can be cement soil or cement mortar. Due to the proximity to the existing high-speed railway station building, the construction requirements for the new enclosure piles are relatively high. After the pile foundation backfilling is completed, the foundation needs to be strengthened immediately before the next step of enclosure pile construction can be carried out.

At present, there are two commonly used waste pile treatment techniques: direct pile extraction and drag reduction pile extraction. Among them, direct pile extraction is the simplest pile extraction method, which mainly relies on the power of the extraction machine to overcome the frictional resistance of the pile and its own gravity. Due to its limitations Sex has gradually been abandoned. The key process of drag reduction and pulling out piles is to peel off the soil around the abandoned piles to reduce the frictional resistance and achieve the purpose of pulling out the piles. If it is twisted off, the clamping force is insufficient, and it is easy to cause deformation of the drilling and stripping sleeve.

To this end, a device and construction method for removing pile foundations near existing high-speed railway station buildings are provided to solve the problem of twisting of piles after stripping.

Contents of the invention

The object of the present invention is to provide a device and construction method for removing pile foundations near the existing high-speed railway station buildings, so as to solve the problems raised in the above-mentioned background technology.

To achieve the above object, the present invention provides the following technical solutions:

An existing pile foundation demolition device near the high-speed railway station building, including a demolition device, the demolition device includes a drilling casing for an external drilling rig, a reinforcement protection component and a stripping component;

Drilling casing, the inner and outer helical pipes for earth drilling are respectively installed on the inner and outer side walls of the drilling casing;

Reinforcement and protection components, the reinforcement and protection components include pre-embedded diversion pouring layer on the conical arc surface outside the upper end of the pile and a protective frame installed on the upper end of the diversion pouring layer;

piles vertically penetrating the geological formation and extending to the rock layer at the lower end of the geological formation;

A protective frame, the protective frame is sleeved on the outer side of the outer spiral tube;

A stripping assembly, the stripping assembly includes vertical insertion cones distributed in a circumferential array on the drilling casing and a base swivel assembled on the bottom surface of the drilling casing;

The base swivel, the base swivel is provided with through grooves distributed in a circular array corresponding to the inserting cones one by one, and the positioning cones inserted into the rock layer through the insertion of the cones to squeeze and slide are installed in the through grooves.

Preferably, the inner helical tube and the outer helical tube are respectively sleeved on the inner and outer sides of the drilling casing, the upper end of the drilling casing is provided with a rotating rod connected to the drilling rig, and the drilling casing, the inner helical tube and the outer helical The tube is rotated to form an annular isolation groove.

Preferably, the diversion pouring layer is a layer of concrete poured outside the upper end of the pile, the diversion pouring layer forms a fault at the upper end of the circular isolation groove, the outer upper end of the diversion pouring layer is fixedly connected to the protective frame, and the diversion pouring layer The pouring layer and the upper port of the circular isolation groove are poured into a conical diversion surface, and an open groove communicating with the outer spiral pipe is formed between the protective frame and the diversion pouring layer.

Preferably, the conical guide surface of the diversion pouring layer is equipped with an inclined rotating plate of ring plate bricks, a driving gear driven by a motor is arranged in the diversion pouring layer, and the inner side of the inclined rotating plate is provided with a The driving gear meshes with the connected internal ring gear, and the upper and lower ends of the inclined rotating plate are smoothly provided with extension plates extending along the conical diversion surface on the diversion pouring layer.

Preferably, the upper end of the base swivel is provided with a mounting groove, the base swivel is fixed on the lower end of the drilling casing through the mounting groove, the drilling casing is provided with slots distributed in a circular array, and the upper end of the base swivel is provided with Corresponding extrusion jacks communicate vertically with the slots.

Preferably, the through grooves distributed in a circular array communicate with the extrusion sockets respectively, and the first pressure block and the second pressure block are inserted into the gaps in the extrusion sockets, and the outer side of the first pressure block is provided with The sliding rod is slidably inserted into the through groove, the end of the sliding rod is provided with a limiting plate, the outer wall of the other end of the second pressing block is provided with a positioning cone, and the positioning cone abuts against the rock layer near the side of the pile along the through groove .

Preferably, a spring is sleeved on the positioning cone and the sliding rod, and one end of the spring is pressed on the inner wall of the through groove, and the tapered outer wall on the opposite side of the first pressing block and the second pressing block forms a Cone groove, the upper end of the insertion cone extends to the outside of the drilling casing, and the upper end of the insertion cone is fixed on the lower end of the pressure bearing ring, and the lower end of the insertion cone is provided with a cone head that is squeezed and inserted into the cone groove.

Preferably, the upper ends of the first pressing block and the second pressing block are vertically provided with a pair of extending vertical plates, and the inner walls of the tapered grooves on the first pressing block and the second pressing block and the extending vertical plates are provided with upper and lower penetrating vertical plates. Positioning pressure groove, the outer wall of the cone head is provided with a pair of limiting side bars distributed left and right, and the limiting side bars are pressed into the limiting pressure groove.

Preferably, the width of the cone head decreases from top to bottom, the width of the lower end of the cone head is equal to the distance between adjacent extending risers, and the width of the upper end of the cone head is larger than the compression amount of the spring.

A construction method realized according to the above-mentioned existing pile foundation removal device near the high-speed railway station building, the construction method comprises the following steps:

S1: pouring and installing diversion pouring layer and protective frame on the upper end of the pile, and installing a motor-driven inclined rotary plate on the inclined surface of the diversion pouring layer;

S2: Set inner helical tubes and outer helical tubes on the inner and outer sides of the drilling casing, set a base swivel at the bottom of the drilling casing, and connect the drilling rig at the upper end of the drilling casing;

S3: Driven by the rotation and descent of the drilling rig, the drilling casing is rotated and drilled on the outside of the pile to form a circular isolation groove. During the drilling process, the soil is driven up by the spiral outer wall and collected along the diversion pouring layer;

S4: After the drilling is completed, the positioning cone is pressed down by the impact of the inserting cone, so that the positioning cone is embedded in the rock layer to form the fixing of the drilling casing, the outer spiral pipe is removed, and cement slurry is poured in the formed circular gap as a backfill. The drilling casing is driven to rotate through the pulling device and twisted off the stripped piles and geological layers. After being completely pulled out, the backfill is reinforced in the poured backfill layer.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention realizes drilling stripping by setting the drilling casing, and by setting the cooperation of the inserting cone and the positioning cone, and then inserting the positioning cone horizontally into the stripped rock layer through vertical extrusion, forming a lateral Clamping force, which in turn reduces the connection strength of the pile base, improves the clamping force, and facilitates twisting and pulling out;

2. The present invention is provided with a reinforcement layer at the upper end of the pile, thereby improving the strength of the upper geological layer to avoid collapse, and at the same time, using the protective frame and the diversion surface to realize the timely diversion of the excavated soil, which is realized by cooperating with the rotating rotating plate Clean up in time to avoid soil accumulation and improve drilling efficiency;

3. The present invention forms a distributed backfilling method by setting detachable spiral pipes. Under the premise of realizing the protection of the surrounding geological conditions, the impact caused by the removal of piles is reduced, and safety protection is provided, thereby preventing hole collapse and improving construction efficiency. safety.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 is an enlarged view of the structure at A in Figure 1;

Figure 3 is an enlarged view of the structure at B in Figure 1;

Fig. 4 is the three-dimensional structure schematic diagram of positioning cone of the present invention;

Fig. 5 is a schematic diagram of the three-dimensional structure of the base swivel of the present invention;

Fig. 6 is a schematic diagram of the three-dimensional structure of the inclined rotating plate of the present invention.

In the figure: 1. geological layer; 2. rock layer; 3. pile; 4. drilling casing; 5. ring isolation groove; 6. inner spiral pipe; 7. outer spiral pipe; 8. protective frame; 9 , pressure ring; 10, inserting cone; 11, base swivel; 12, rotating rod; 13, driving gear; 14, diversion pouring layer; 15, opening slot; , through groove; 19, first pressing block; 20, second pressing block; 21, positioning cone; 22, spring; 23, sliding rod; 24, limiting plate; 25, installation groove; 26, inner ring gear; 27 28. Extension plate; 29. Taper head; 30. Taper groove; 31. Extension vertical plate; 32. Limiting side bar; 33. Limiting pressure groove.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Referring to Fig. 1 to Fig. 6, the present invention provides a technical solution:

An existing pile foundation demolition device near a high-speed railway station building includes a demolition device, which includes a drilling casing 4 connected to an external drilling rig, a reinforcement protection component and a stripping component.

The inner and outer helical pipes 6 and 7 for earth drilling are installed on the inner and outer side walls of the drilling casing 4 respectively, and the inner helical pipe 6 and the outer helical pipe 7 are sleeved on the inner and outer sides of the drilling casing 4 respectively. side, the upper end of the drilling casing 4 is provided with a rotating rod 12 connected to the drilling machine, the drilling casing 4, the inner helical pipe 6 and the outer helical pipe 7 rotate to form a circular isolation groove 5, and the inner helical pipe 6 and the outer helical pipe The rotation of 7 realizes drilling construction, and then pile column 3 is stripped off.

The reinforcement protection assembly includes the conical arc diversion pouring layer 14 pre-buried and poured on the outside of the upper end of the pile 3 and the protective frame 8 installed on the upper end of the diversion pouring layer 14. The pile 3 vertically penetrates the geological layer 1 and extends to The rock layer 2 at the lower end of the geological layer 1, the diversion pouring layer 14 is a layer of concrete layer poured on the outside of the upper end of the pile 3, the diversion pouring layer 14 forms a fault at the upper end of the circular isolation groove 5, and the diversion pouring layer 14 The upper end of the outer side is fixedly connected to the protective frame 8, and the upper end port position of the diversion pouring layer 14 and the circular isolation groove 5 is poured into a conical diversion surface, and a gap communicating with the outer spiral pipe 7 is formed between the protective frame 8 and the diversion pouring layer 14. The open groove 15 realizes the uniform recovery of the soil by setting the protective frame 8. During the drilling process, the spiral outer wall drives the soil to rise and collect along the diversion pouring layer 14.

The protective frame 8 is sleeved on the outer side of the outer spiral tube 7, and the conical diversion surface of the diversion pouring layer 14 is installed with an inclined rotary plate 16 of a ring plate brick, and the driving gear 13 driven by a motor is arranged in the diversion pouring layer 14 , the inner side of the inclined rotating plate 16 is provided with an inner ring gear 26 meshed with the driving gear 13, and the upper and lower ends of the inclined rotating plate 16 are smoothly provided with an extension plate 28 extending along the conical diversion surface on the diversion pouring layer 14 , using the motor-driven inclined rotary plate 16 to realize the driving and falling of the soil, so as to avoid the blockage caused by the accumulation of soil.

The stripping assembly includes the inserting cones 10 that are vertically inserted into the circumferential array on the drilling casing 4 and the base swivel 11 assembled on the bottom surface of the drilling casing 4, the base swivel 11 is provided with the same A corresponding through-groove 18 is distributed in a circumferential array. The through-groove 18 is compressed and installed with a positioning cone 21 that is squeezed and slid through the insert cone 10 and inserted on the rock layer 2. The upper end of the base swivel 11 is provided with a mounting groove 25. The base swivel 11 is fixed on the lower end of the drilling sleeve 4 through the mounting groove 25, the drilling sleeve 4 is provided with slots 17 distributed in a circular array, and the upper end of the base swivel 11 is provided with a corresponding vertical connection with the slots 17. Extrusion jacks 27, the through grooves 18 distributed in a circumferential array are respectively communicated with the extrusion jacks 27, the first briquetting block 19 and the second briquetting block 20 are inserted in the gap of the extruding jacks 27, the first briquetting block 19 The outer side is provided with a sliding rod 23 that is slidably inserted into the through groove 18. The end of the sliding rod 23 is provided with a limiting plate 24, and the other end outer wall of the second pressure block 20 is provided with a positioning cone 21, and the positioning cone 21 is arranged along the through groove 18. Butt against the rock layer 2 near the side of the pile 3, utilize the through groove 18, the slot 17 and the extrusion socket 27 to realize the lateral sliding installation of the positioning cone 21.

Both the positioning cone 21 and the sliding rod 23 are sleeved with a spring 22, one end of the spring 22 is pressed on the inner wall of the through groove 18, and the tapered outer wall on the opposite side of the first pressing block 19 and the second pressing block 20 forms a tapered groove 30, the upper end of the insertion cone 10 extends to the outside of the drilling casing 4, and the upper end of the insertion cone 10 is fixed on the lower end of the pressure ring 9, and the lower end of the insertion cone 10 is provided with a cone head that is squeezed and inserted into the taper groove 30 29. During the drilling process, through the return elastic force of the spring 22, the first pressing block 19 and the second pressing block 20 are relatively fitted, so that the positioning cone 21 is located in the through groove 18, when the base swivel 11 is embedded in the rock layer 2 In the middle, the insertion cone 10 is driven down by squeezing the pressure bearing ring 9, so that the cone head 29 is pressed into the cone groove 30, the positioning cone 21 slides outward and is laterally pressed and embedded in the rock layer 2, and the stripped pile 3 Lateral clamping is formed in the outer rock layer 2, thereby reducing the connection strength of the base of the pile 3, increasing the clamping force, and facilitating twisting and pulling out.

The upper ends of the first briquetting block 19 and the second briquetting block 20 are vertically provided with a pair of extending risers 31, and the inner walls of the tapered groove 30 on the first briquetting block 19 and the second briquetting block 20 and the extending risers 31 are provided with vertically penetrating The limit pressure groove 33, the outer wall of the cone head 29 is provided with a pair of limit side bars 32 distributed left and right, the limit side bars 32 are pressed in the limit pressure groove 33, the width of the cone head 29 decreases from top to bottom, The width of the lower end of the cone head 29 is equal to the distance between the adjacent extension risers 31, the width of the upper end of the cone head 29 is greater than the compression amount of the spring 22, and the extension riser 31 is used to guide and insert the insertion cone 10. During the vertical insertion process, through the extrusion of the limiting side bar 32 on the limiting pressure groove 33, the extrusion position relative to the insertion cone 10 is prevented from causing offset, thereby improving the insertion position accuracy of the positioning cone 21, and realizing the alignment. The socket connection at the bottom of pile 3 is broken after stripping.

A construction method according to the realization of the above-mentioned existing pile foundation removal device near the high-speed railway station building, the construction method comprises the following steps:

S1: Concrete and install diversion pouring layer 14 and protective frame 8 on the upper end of pile 3, and install motor-driven inclined rotary plate 16 on the inclined surface of diversion pouring layer 14;

S2: The inner helical tube 6 and the outer helical tube 7 are arranged on the inner and outer sides of the drilling casing 4, a base swivel 11 is arranged at the bottom of the drilling casing 4, and the upper end of the drilling casing 4 is connected to the drilling rig;

S3: Driven by the rotation and descent of the drilling rig, the drilling casing 4 is rotated and drilled on the outside of the pile 3 to form a circular isolation groove 5. During the drilling process, the outer wall of the spiral drives the soil to rise and pour the layer along the diversion 14 collection;

S4: After the drilling is completed, the positioning cone 21 is pressed down by the impact of the inserting cone 10, so that the positioning cone 21 is embedded in the rock layer 2, forming the fixing of the drilling casing 4, removing the outer spiral tube 7, and pouring cement in the formed circular gap Slurry is used as backfill, and the drilling casing 4 is driven to rotate through the pulling device to twist off the stripped piles 3 and geological layers 1. After being completely pulled out, the backfill is reinforced in the poured backfill layer.

Working principle: Firstly, the diversion pouring layer 14 and the protective frame 8 are poured and installed on the upper end of the pile 3, and the inclined rotary plate 16 driven by the motor is installed on the inclined surface of the diversion pouring layer 14, and the inside and outside of the drilling casing 4 The inner helical tube 6 and the outer helical tube 7 are arranged on both sides, and a base swivel 11 is arranged at the bottom of the drilling casing 4. The upper end of the drilling casing 4 is connected to the drilling rig, and driven by the rotation and descent of the drilling rig, the drilling casing The pipe 4 is rotated and drilled on the outside of the pile 3 to form a circular isolation groove 5. During the drilling process, the outer wall of the spiral drives the soil to rise and collect along the diversion pouring layer 14 to realize the unified recovery of the soil.

Utilize the through groove 18, the slot 17 and the extruding socket 27 to realize the lateral sliding installation of the positioning cone 21, and through the return elastic force of the spring 22, the first pressing block 19 and the second pressing block 20 are relatively fitted, thereby making the positioning cone 21 is located in the through groove 18. When the base swivel 11 is embedded in the rock layer 2, the pressure bearing ring 9 is pressed to drive the insertion cone 10 down, so that the cone head 29 is pressed into the cone groove 30, and the positioning cone 21 slides outward. And laterally extruding and embedding in the rock layer 2, forming a lateral clamping in the rock layer 2 outside the stripped pile 3, thereby reducing the connection strength of the base of the pile 3, increasing the clamping force, and being easy to twist and pull out.

Disassemble the outer spiral pipe 7, pour cement slurry in the formed ring gap as backfill, drive the drilling casing 4 to rotate through the pulling device and twist off the stripped pile 3 and geological layer 1. Reinforce the backfill in the poured backfill layer. Through distributed backfill, on the premise of realizing the protection of the surrounding geological conditions, the impact caused by the removal of the pile 3 is reduced, and safety protection is provided, thereby preventing hole collapse and improving construction safety.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (8)

1. The utility model provides a device is demolishd to nearby pile foundation of existing high-speed railway station room, includes demolishs device, its characterized in that: the dismantling device comprises a drilling sleeve (4) externally connected with a drilling machine, a reinforcing protection assembly and a stripping assembly;

the drilling device comprises a drilling sleeve (4), wherein an inner spiral pipe (6) and an outer spiral pipe (7) for drilling the ground are respectively arranged on the inner side wall and the outer side wall of the drilling sleeve (4), the inner spiral pipe (6) and the outer spiral pipe (7) are respectively sleeved on the inner side and the outer side of the drilling sleeve (4), a rotating rod (12) connected with a drilling machine is arranged at the upper end of the drilling sleeve (4), and the drilling sleeve (4), the inner spiral pipe (6) and the outer spiral pipe (7) rotate to form a circular ring isolation groove (5);

the reinforcing and protecting assembly comprises a diversion casting layer (14) of a conical cambered surface which is pre-buried and cast at the outer side of the upper end of the pile (3) and a protecting frame (8) which is arranged at the upper end of the diversion casting layer (14), wherein the diversion casting layer (14) is a layer of concrete layer cast at the outer side of the upper end of the pile (3), the diversion casting layer (14) forms a fault at the upper end of the annular isolation groove (5), the upper end of the outer side of the diversion casting layer (14) is fixedly connected with the protecting frame (8), the port positions of the upper ends of the diversion casting layer (14) and the annular isolation groove (5) are cast into conical diversion surfaces, and an open groove (15) communicated with the outer spiral pipe (7) is formed between the protecting frame (8) and the diversion casting layer (14);

the pile (3) vertically penetrates through the geological layer (1) and extends to the rock layer (2) at the lower end of the geological layer (1);

the protection frame (8) is sleeved on the outer side of the outer spiral tube (7);

the stripping assembly comprises inserting cones (10) vertically inserted on the drilling sleeve (4) in a circumferential array mode and base swivel rings (11) assembled on the bottom surface of the drilling sleeve (4);

the base swivel (11), be provided with on base swivel (11) with insert awl (10) the circumference array distribution run-through groove (18) of one-to-one, install in the groove (18) compression through insert awl (10) extrusion slip peg graft locating cone (21) on rock layer (2).

2. The pile foundation demolition apparatus of claim 1, wherein: the conical flow guide surface of the flow guide pouring layer (14) is provided with an inclined rotating plate (16) of a circular plate brick, a motor-driven driving gear (13) is arranged in the flow guide pouring layer (14), an inner gear ring (26) meshed with the driving gear (13) is arranged on the inner side of the inclined rotating plate (16), and the upper end and the lower end of the inclined rotating plate (16) are both smoothly provided with extension plates (28) extending along the conical flow guide surface of the flow guide pouring layer (14).

3. The pile foundation demolition apparatus of claim 1, wherein: the upper end of base swivel (11) is provided with mounting groove (25), and base swivel (11) pass through mounting groove (25) to be fixed in the lower extreme of drilling sleeve pipe (4), is provided with slot (17) that circumference array distributes on drilling sleeve pipe (4), and base swivel (11) upper end is provided with extrusion jack (27) that correspond with slot (17) vertical intercommunication.

4. A pile foundation demolition unit in the vicinity of an existing high-speed rail station building as claimed in claim 3, wherein: the utility model discloses a pile, including extrusion jack (27), circumference array distribution run through groove (18) and be in extrusion jack (27) intercommunication respectively, the clearance grafting has first briquetting (19) and second briquetting (20) in extrusion jack (27), the outside of first briquetting (19) is provided with slide bar (23) of slip grafting on running through groove (18), and the tip of slide bar (23) is provided with limiting plate (24), and the other end outer wall of second briquetting (20) is provided with locating cone (21), and locating cone (21) are supported on rock layer (2) near stake (3) one side along running through groove (18).

5. The pile foundation demolition apparatus of claim 4, wherein: the positioning cone (21) and the sliding rod (23) are both sleeved with springs (22), one ends of the springs (22) are pressed on the inner wall of the through groove (18), a cone groove (30) is formed in the outer wall of one side of the first pressing block (19) opposite to the second pressing block (20), the upper end of the inserting cone (10) extends to the outer side of the drilling sleeve (4), the upper end of the inserting cone (10) is fixed to the lower end of the bearing ring (9), and a cone head (29) which is extruded and spliced with the cone groove (30) is arranged at the lower end of the inserting cone (10).

6. The pile foundation demolition apparatus of claim 5, wherein: the upper ends of the first pressing block (19) and the second pressing block (20) are vertically provided with a pair of extending vertical plates (31), the inner walls of the conical grooves (30) on the first pressing block (19) and the second pressing block (20) and the extending vertical plates (31) are provided with limiting pressing grooves (33) penetrating up and down, the outer walls of the conical heads (29) are provided with a pair of limiting side strips (32) distributed left and right, and the limiting side strips (32) are pressed in the limiting pressing grooves (33).

7. The pile foundation demolition apparatus of claim 6, wherein: the width of the conical head (29) is gradually reduced from top to bottom, the width of the lower end of the conical head (29) is equal to the distance between adjacent extension vertical plates (31), and the width of the upper end of the conical head (29) is larger than the compression amount of the spring (22).

8. A construction method for realizing the pile foundation demolition arrangement near the existing high-speed rail station house according to any one of claims 1 to 7, characterized in that: the construction method comprises the following steps:

s1: pouring and installing a diversion pouring layer (14) and a protection frame (8) at the upper end of the pile (3), and installing an inclined rotating plate (16) driven by a motor to rotate on the inclined surface of the diversion pouring layer (14);

s2: an inner spiral pipe (6) and an outer spiral pipe (7) are arranged at the inner side and the outer side of the drilling sleeve (4), a base swivel (11) is arranged at the bottom of the drilling sleeve (4), and the upper end of the drilling sleeve (4) is connected with a drilling machine;

s3: under the rotation and descending driving of a drilling machine, a drilling sleeve (4) rotates to drill holes on the outer side of a pile (3) to form a circular isolation groove (5), and soil is driven to rise through a spiral outer wall and is collected along a diversion pouring layer (14) in the drilling process;

s4: after drilling is completed, the positioning cone (21) is embedded into the rock layer (2) through the impact of the inserting cone (10), the drilling sleeve (4) is fixed, the outer spiral pipe (7) is detached, cement paste is poured into a formed annular gap to serve as a backfill, the drilling sleeve (4) is driven to rotate through the pulling-out device, the stripped pile (3) and the geological layer (1) are twisted off, and after the pile is completely pulled out, backfill is reinforced in the poured backfill layer.

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