CN116104086A

CN116104086A - Soil nail extractor

Info

Publication number: CN116104086A
Application number: CN202310147848.6A
Authority: CN
Inventors: 俞剑龙
Original assignee: Keyi College of ZSTU
Current assignee: Keyi College of ZSTU
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2023-05-12
Also published as: CN114250772A; CN114250772B

Abstract

The invention relates to a soil nail, which comprises a soil nail shell and a soil nail inner core, wherein the soil nail shell comprises a first side plate, a second side plate, a quadrangular nail head and a pointed end connected with one end of the nail head, the first side plate is provided with two first hinge shafts which are parallel to the first side plate and are hinged to two opposite sides of the nail head in a one-to-one correspondence manner, the second side plate is provided with two second side plates which are hinged to the two first side plates in a one-to-one correspondence manner through the second hinge shafts, the two first side plates and the two second side plates enclose a square accommodating hole, the soil nail inner core is inserted into the accommodating hole in a pluggable manner, one end of the soil nail inner core far away from the accommodating hole extends out of the accommodating hole, and the first side plate can rotate towards the accommodating hole by taking the second hinge shafts as shafts. The invention also provides a soil nail extractor for extracting the soil nail inner core. The invention provides a labor-saving soil nail for pulling out, which solves the problem of labor saving during the pulling out of the existing soil nail.

Description

Soil nail extractor

The present application is filed with application number 2021113843960,

application day

2021, 11 and 22, and named "nail and soil nail extractor".

Technical Field

The invention relates to the technical field of building construction, in particular to a soil nail and a soil nail extractor.

Background

In the building construction process, a foundation pit is required to be dug for the construction of an underground part. In many places, the foundation pit is required to be large in gradient and easy to slip after the construction is completed, and the foundation pit is required to be excavated in the construction process, wherein the size of the foundation pit is not larger than the area corresponding to the construction area of the building (hereinafter referred to as foundation pit non-overspray) and any object (including above-ground and underground objects) generated by the building is not larger than the area corresponding to the construction area of the building (hereinafter referred to as component non-overspray). Therefore, the soil nails are designed on the side wall of the foundation pit to prevent landslide, and the soil nails are pulled out after construction is completed. The existing soil nail is of a steel column structure with a pointed end, and the problem of labor-consuming pulling-out exists.

Disclosure of Invention

The invention provides a labor-saving soil nail for pulling out, which solves the problem of labor saving during the pulling out of the existing soil nail.

The technical problems are solved by the following technical scheme: the utility model provides a soil nail, includes soil nail shell and soil nail inner core, the soil nail shell includes first curb plate, second curb plate, quadrangular nail head and connects the tip in nail head one end, and first curb plate has two, and two first curb plates hinge on the opposite both sides of nail head through the first hinge one-to-one with first curb plate is parallel, and the second curb plate has two, and two second curb plates hinge on two first curb plates through the second hinge one-to-one, two first curb plate and two the square accommodation hole is enclosed to the second curb plate, soil nail inner core is worn to establish with pluggable in the accommodation hole, soil nail inner core is kept away from the one end of accommodation hole and is stretched out the accommodation hole, and first curb plate can use the second hinge is the axle and is rotated in the accommodation hole, and the second curb plate can use the second hinge is the axle is rotated in the accommodation hole. When the soil nail is nailed on the side wall of the foundation pit, the first side plate and the second side plate extend out of the side wall of the foundation pit, and the process of extracting the soil nail is as follows: the soil nail inner core is pulled out, the second side plate and the first side plate are enabled to rotate in the accommodating hole, the first side plate and the second side plate are enabled to be loosened with soil as a result of rotation, and the soil nail outer shell is pulled out. The soil nails can lead to rough surfaces and different soil properties after being nailed, so that the extraction force is different, the power of the extraction machine is not well controlled (the extraction is not performed, the cost is increased), and the extraction is laborious. According to the technical scheme, the friction coefficient between the soil nail inner core and the soil nail outer shell can be controlled (the surface cannot generate smooth finish change in the process of the soil nail nailing), so that the upper soil nail inner core can be pulled out in a labor-saving manner, the soil nail outer shell can move towards the inner part of the outer shell after the soil nail inner core is pulled out and is separated from soil, and therefore labor is saved when the upper soil nail outer shell is pulled out.

Preferably, the end face of one end of the first side plate, which is connected with the nail head, is provided with an arc-shaped hole, the nail head is provided with an arc-shaped connecting pin penetrating through the arc-shaped hole, the center line of the circle where the arc-shaped hole is located and the center line of the circle where the arc-shaped connecting pin is located are both axes of the first hinge shaft, and when the first side plate rotates in the accommodating hole, the depth of the arc-shaped connecting pin inserted into the arc-shaped hole is increased. The first hinge shaft can assist in stress through the arc-shaped connecting pin under the condition that the first hinge shaft is smaller, so that deformation and damage of the first hinge shaft can not occur when the soil nail shell is pulled out. The connecting mode of the structure can not interfere the rotation of the side plates, and can realize auxiliary resistance.

Preferably, the two opposite side surfaces of the soil nail inner core are provided with oil grooves, the inner ends of the oil grooves positioned on one side surface of the soil nail inner core are communicated with the inner ends of the oil grooves positioned on the other side surface of the soil nail inner core through a communication oil duct, and the outer ends of the oil grooves are exposed out of the soil nail outer shell. When the soil nail is pulled out, the rust loosening agent is injected into the accommodating hole from the oil groove on one side surface of the soil nail inner core and flows out from the oil groove on the other side surface of the soil nail inner core. Can further make the time of pulling out the soil nail inner core more laborsaving.

The invention also provides a soil nail extractor for extracting the soil nail inner core. The soil nail extractor comprises a supporting seat, two clamping mechanisms connected to the supporting seat and a separating and combining mechanism for driving the two clamping mechanisms to separate and combine, wherein the clamping mechanisms comprise a connecting seat, a clamping round roller connected to the connecting seat in a rotating mode and a driving motor connected to the connecting seat and used for driving the clamping round roller to rotate, a connecting column extending in the directions of the two clamping mechanisms respectively is arranged on the connecting seat, the connecting column penetrates through one end of a supporting arm, the other end of the supporting arm is connected with the supporting seat, and the extending direction of the clamping roller is perpendicular to the distribution direction of the two clamping mechanisms. The process of extracting the soil nail inner core through the inner core extractor is as follows: the two clamping structures are supported on two opposite side surfaces of the soil nail inner core in a one-to-one correspondence manner through the clamping rollers, the supporting seat is supported on the side wall of the foundation pit where the soil nail is located, the two clamping structures are driven to be clamped on the soil nail inner core through the separating and combining structure, the driving motor drives the clamping round rollers to rotate, the rotation directions of the clamping round rollers on the two clamping structures are opposite, and the rotating result of the clamping round rollers is that the soil nail inner core is driven to be pulled out from the soil nail outer shell; after the soil nail inner core is pulled out, the first side plate and the second side plate are rotated in the accommodating holes, so that looseness is generated between the first side plate and the second side plate and between the first side plate and the soil, and finally the soil nail outer shell is pulled out. When the soil nail inner core is pulled out, the pulling mechanism does not need to be stretched along with the increase of the pulling length of the soil nail inner core, and if the soil nail inner core is pulled out by stretching the cylinder oil cylinder, the bending problem is easy to occur because the stretching is horizontal.

Preferably, the support seat is provided with a hanging through hole. And the soil nail outer shell is penetrated in the hanging through hole in the process of pulling out the soil nail inner core by the inner core pulling-out machine. The inner core extractor is convenient to fix on the inclined wall.

The soil nail extractor further comprises a rust loosening agent storage box with a recovery port and an oil pump with an inlet end connected with the rust loosening agent storage box, oil grooves are formed in the surfaces of two opposite sides of the soil nail inner core, the inner ends of the oil grooves on one side surface of the soil nail inner core are communicated with the inner ends of the oil grooves on the other side surface of the soil nail inner core through a communicating oil duct, the outer ends of the oil grooves are exposed out of the soil nail outer shell, and the oil grooves are sealed by the soil nail outer shell to form oil holes; the outlet end of the oil pump is connected with one end of the output main pipe, and the other end of the output main pipe is connected with a plurality of spray heads. In the process of pulling out the soil nail inner core by the inner core pulling machine, the spray heads are correspondingly inserted into the oil holes on one side surface of the soil nail inner core one by one, the oil pump enables the rust loosening agent in the rust loosening agent storage box to be sprayed out from the spray heads and enter the oil holes, and the recovery port is butted with the outer ends of the oil holes on the other side surface of the soil nail inner core to catch the flowing rust loosening agent. Can make the pulling-out more labor-saving.

The soil nail extractor further comprises a temperature detection switch for detecting the temperature of the clamping round roller, and the oil pump is started when the temperature detection switch detects that the temperature of the clamping round roller reaches a set value; each clamping round roller is provided with the temperature detection switch, and all the temperature detection switches are connected in parallel; the temperature detection switch comprises an annular cavity which is arranged in the clamping round roller and extends along the circumferential direction of the clamping round roller, and a lead hole which is arranged in the center of the clamping roller and extends along the axial direction of the clamping roller, wherein a movable conducting ring and two fixed conducting rings are arranged in the annular cavity, the movable conducting rings are electrically connected together through the same fixed conducting rings, paraffin is filled in the annular cavity, the movable conducting rings are separated from the other fixed conducting rings at intervals under the isolation action of the paraffin, the paraffin is melted when the temperature of the clamping round roller reaches a set value, the movable conducting rings are pressed on the other fixed conducting rings under the action of the conducting springs after the paraffin is melted, so that the two fixed conducting rings are connected together through wires in a one-to-one correspondence manner, and the two conducting rods are arranged in a penetrating manner in the lead hole in a penetrating manner and are in conductive butt joint with the two conducting rods in a one-to-one correspondence manner. Can conveniently learn whether the centre gripping roller produces the phenomenon of skidding, it is big to slip the resistance that the back instruction was met, pours into the rust-loosening agent into this moment into, can reduce the connecting force between soil nail inner core and the soil nail shell and reduce the load of inner core extractor to avoid tasteless injection rust-loosening agent.

Preferably, the clamping roller is of a metal structure, the fixed conducting ring is fixed in the annular cavity through heat conduction insulating glue, the electric brush and the clamping round roller are fixed together in an insulating mode, and the movable conducting ring is suspended in the annular cavity through the conducting spring. The response to the swipe can be made fast.

Preferably, the fixed conducting ring is provided with a plurality of conducting pins, and the paraffin is melted and then moves the conducting ring to contact with the fixed conducting ring through the conducting pins under the action of the conducting spring so as to press the fixed conducting ring. The convenience of electrically connecting the movable conductive ring with the other conductive ring can be improved.

Preferably, one clamping structure is provided with two clamping round rollers, the driving motor is a double-headed motor, driven gears are arranged at two ends of the clamping round rollers, driving gears are arranged on two power output shafts of the driving motor and are meshed with two intermediate gears, the two intermediate gears are meshed with the driven gears on the two clamping round rollers in one-to-one correspondence, and the driven gears are rotationally connected to an intermediate gear connecting plate connected with the connecting seat. The stability of the clamping structure supported on the soil nail inner core can be improved when the clamping structure is used.

Preferably, the separating and combining structure comprises two cylinders; the connecting seat of one clamping structure is connected with the cylinder body of the air cylinder, and the connecting seat of the other clamping structure is connected with the piston rod of the air cylinder; and in the process of extracting the soil nail inner core by the inner core extractor, the soil nail is positioned between the two cylinders. The structure is reduced, and the clamping is stable and reliable.

Preferably, the conductive rod is suspended and penetrated in the lead hole.

Preferably, one of the conductive bars is penetrated in the other conductive bar, and the two conductive bars are connected together in an insulating manner. Compact structure, the fixed conducting rod of overall arrangement is convenient.

The invention has the following advantages: the labor is saved when the soil nails are pulled out; whether the soil nails are unplugged and need to be lubricated in the process of unplugging can be conveniently and accurately known; the parts for clamping the soil nails to be pulled out do not need to move along with the soil nails, and can be pulled out and lubricated conveniently when the soil nails are long, so that the soil nails are pulled out in a mode of extending the cylinder in the prior art, no dripping phenomenon occurs, the environment friendliness is better, and the structure is more compact.

Drawings

FIG. 1 is an axial cross-sectional schematic view of a soil nail;

FIG. 2 is an enlarged partial schematic view at A of FIG. 1;

FIG. 3 is a schematic elevation view of a soil nail;

FIG. 4 is an enlarged partial schematic view at B of FIG. 3;

FIG. 5 is a schematic view of a soil nail extractor from one perspective;

FIG. 6 is an enlarged partial schematic view of FIG. 5

FIG. 7 is a schematic view of another view angle of the soil nail extractor for extracting soil nails

FIG. 8 is a schematic diagram of the connection between the grip roller, the temperature detection switch and the oil pump;

fig. 9 is a partially enlarged schematic view at C of fig. 8.

In the figure: the side wall 4 of the foundation pit, the foundation pit 5, the soil nail extractor 6, the soil nail inner core 7, the first side plate 8, the second side plate 9, the nail head 10, the tip 11, the first hinge shaft 12, the second hinge shaft 13, one end 14 of the soil nail inner core far away from the lamp cap, the arc-shaped hole 15, the arc-shaped connecting pin 16, the oil groove 17, the communication oil duct 18, the oil hole 19, the supporting seat 20, the opening and closing mechanism 21, the connecting seat 22, the clamping round roller 23, the driving motor 24, the connecting column 25, the supporting arm 26, the air cylinder 27, the driven gear 28, the power output shaft 29, the driving gear 30, the intermediate gear 31, the intermediate gear connecting plate 32, the recovery port 33, the rust-loosening agent storage box 34, the oil pump 35, the output manifold 36, the spray head 37, the power supply 38, the annular cavity 39, the lead hole 40, the movable conductive ring 41, the first fixed conductive ring 42, the second fixed conductive ring 43, the conductive spring 44, the paraffin 45, the conductive needle 46, the conductive wire 47, the brush 48, the first conductive rod 49, the second conductive rod 50, the conductive insulating glue 51, the reset rod 52 and the soil nail housing 53.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 to 9, a soil nail comprises a soil nail housing 53 and a soil nail inner core 7, wherein the soil nail housing comprises a first side plate 8, a second side plate 9, a quadrangular prism-shaped nail head 10 and a pointed head 11 connected to one end of the nail head, and the nail head and the pointed head are integrally formed together. The two first side plates are hinged on two opposite sides of the nail head in a one-to-one correspondence manner through first hinge shafts 12 parallel to the first side plates, the two second side plates are hinged on the two first side plates in a one-to-one correspondence manner through second hinge shafts 13, the two first side plates and the two second side plates enclose into square accommodating holes, and the soil nail inner cores are inserted in the accommodating holes in a pluggable manner. The soil nail inner core extends out of the accommodating hole from one end 14 of the lamp cap, the first side plate can rotate towards the accommodating hole by taking the second hinge shaft as an axis, and the second side plate can rotate towards the accommodating hole by taking the second hinge shaft as an axis; the first side plate is equipped with arc hole 15 on the terminal surface with the one end of pin fin connection, is equipped with the arc connecting pin 16 of wearing to establish in the arc hole on the pin fin, the central line of the circle at arc hole place and the central line of the circle at arc connecting pin place are all for the axis of first hinge, first side plate is towards holding downthehole when rotating the arc connecting pin inserts the downthehole degree of depth increase of arc. The soil nails are nailed on the side wall 4 of the foundation pit, and the first side plate and the second side plate extend out of the side wall of the foundation pit. The opposite side surfaces of the soil nail inner core are provided with oil grooves 17, in particular on the upper and lower side surfaces of the soil nail inner core when in use. The inner end of the oil groove on one side surface of the soil nail inner core is communicated with the inner end of the oil groove on the other side surface of the soil nail inner core through a communicating oil duct 18, the outer end of the oil groove is exposed out of the soil nail shell, and the oil groove is sealed by the soil nail shell to form an oil hole 19.

The soil nail extractor 6 comprises a supporting seat 20, two clamping mechanisms connected to the supporting seat and a separating and combining mechanism 21 for driving the two clamping mechanisms to separate and combine. When in use, the two clamping structures are distributed along the up-down direction. The clamping mechanism comprises a connecting seat 22, a clamping round roller 23 rotatably connected to the connecting seat and a driving motor 24 connected to the connecting seat and used for driving the clamping round roller to rotate, a connecting column 25 extending along the directions of the two clamping mechanisms respectively is arranged on the connecting seat, one end of a supporting arm 26 is penetrated through the connecting column, and the other end of the supporting arm is connected with the supporting seat. The extending direction of the clamping roller is perpendicular to the distribution direction of the two clamping mechanisms. The supporting seat is provided with a hanging through hole, and the soil nail outer shell is arranged in the hanging through hole in a penetrating way in the process of pulling out the soil nail inner core by the inner core pulling machine. The separating and combining structure comprises two air cylinders 27; the connecting seat of one clamping structure is connected with the cylinder body of the air cylinder, and the connecting seat of the other clamping structure is connected with the piston rod of the air cylinder; and in the process of extracting the soil nail inner core by the inner core extractor, the soil nail is positioned between the two cylinders. One clamping structure is provided with two clamping round rollers, a driving motor is a double-headed motor, driven gears 28 are arranged at two ends of the clamping round rollers, driving gears 30 are arranged on two power output shafts 29 of the driving motor, the driving gears are meshed with two intermediate gears 31, the two intermediate gears are meshed with the driven gears on the two clamping round rollers in one-to-one correspondence, and the driven gears are rotationally connected to an intermediate gear connecting plate 32 connected with a connecting seat. The inner core extractor further comprises a rust loosening agent storage box 34 provided with a recovery port 33 and an oil pump 35 of which the inlet end is connected with the rust loosening agent storage box, wherein the outlet end of the oil pump is connected with one end of an output main pipe 36, and the other end of the output main pipe is connected with a plurality of spray heads 37.

Each clamping round roller is provided with a temperature detection switch for detecting the temperature of the clamping round roller, and the clamping round rollers are of metal structures. All the temperature detection switches are connected in parallel. The temperature detection switch and the oil pump are connected in series with the power supply 38, and the oil pump is started when the temperature detection switch detects that the temperature of the clamping roller reaches a set value. The temperature detecting switch includes an annular cavity 39 provided in the grip round roller and extending in the circumferential direction of the grip round roller, and a lead hole 40 provided in the center of the grip roller and extending in the axial direction of the grip roller. The annular cavity is provided with a movable conducting ring 41 and two fixed conducting rings, namely a first fixed conducting ring 42 and a second fixed conducting ring 43. The movable conductive ring is electrically connected with the first fixed conductive ring through a conductive spring 44, and the annular cavity is filled with paraffin 45, and the melting point of the paraffin in the embodiment is 60 ℃. When the paraffin is solid, the movable conducting ring is separated from the second fixed conducting ring under the paraffin isolation effect. The fixed conducting ring is provided with a plurality of conducting pins 46.

The two fixed conducting rings are connected with two brushes 48 in a one-to-one correspondence through wires 47. Two conductive bars are arranged in the lead hole in a penetrating way, and the two conductive bars are a first conductive bar 49 and a second conductive bar 50 respectively. The first conductive rod is arranged in the second conductive rod in a penetrating way, and the two conductive rods are connected together in an insulating way. The two brushes are in conductive contact with the two conductive rods in a one-to-one correspondence. The fixed conducting ring is fixed in the annular cavity through heat conducting insulating glue 51, and the electric brush and the clamping round roller are fixed together in an insulating way. The movable conductive ring is suspended in the annular cavity by a conductive spring. The conductive rod is suspended and penetrated in the lead hole. When the temperature of the clamping roller is increased to enable paraffin to be melted, the movable conducting ring is contacted with the second fixed conducting ring through the conducting needle under the action of the conducting spring, and then is pressed on the second fixed conducting ring. The movable conductive ring is also provided with a reset rod 52 penetrating out of the clamping round roller. When paraffin melts to generate two fixed conducting rings which are required to be reset after being conducted, the movable conducting rings are driven by the reset rod to disconnect the conducting needle from the second fixed conducting rings and drive the springs to store energy when the paraffin is in a molten state, then the round rollers are cooled and clamped to solidify the paraffin, and the driving action on the reset rod is released after the paraffin is solidified.

The process of extracting the soil nail is as follows: the soil nail inner core is pulled out, the second side plate and the first side plate are enabled to rotate in the accommodating hole, the first side plate and the second side plate are enabled to be loosened with soil as a result of rotation, and the soil nail outer shell is pulled out. The soil nail is pulled out through the soil nail pulling machine, and the process of pulling out the soil nail inner core is: make two clamping structures support on two sides that soil nail inner core is relative through the grip roll one-to-one, the supporting seat supports on the foundation ditch lateral wall at soil nail place, and through dividing and closing structure drive two clamping structures clamp tightly on soil nail inner core, driving motor drive centre gripping roller rotates, and the rotation direction of the centre gripping roller on two clamping structures is opposite, and centre gripping roller pivoted result is the interior pull out of drive soil nail inner core soil nail shell. In the process of extracting the soil nail inner core by the inner core extractor, the spray heads are inserted into the oil holes on one side surface of the soil nail inner core in a one-to-one correspondence manner, and the recovery ports are butted with the outer ends of the oil holes on the other side surface of the soil nail inner core. If the resistance is big because of the reason such as corrosion causes soil nail inner core and soil nail shell link together, the centre gripping roller can skid, and the structure of skidding is for centre gripping roller generates heat and the temperature rise, rises to the oil pump start after paraffin melts, and the oil pump makes the loose rust agent in the loose rust agent bin spout from the shower nozzle and get into the oilhole and retrieve the mouth and catch the souvenir day loose rust agent bin.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a soil nail extractor, its characterized in that includes the supporting seat, connects two fixture and the branch that drives two fixture and close the mechanism that divides on the supporting seat, fixture includes the connecting seat, rotates the centre gripping roller of connection on the connecting seat and connects the pivoted driving motor of drive centre gripping roller on the connecting seat, be equipped with on the connecting seat along two fixture respectively the direction extension spliced pole the spliced pole wears to establish in the one end of support arm, the other end of support arm links together with the supporting seat, the extending direction of centre gripping roller perpendicular to two fixture's distribution direction.

2. The soil nail extractor of claim 1, wherein the support base is provided with a hanging through hole.

3. The soil nail extractor suitable for the soil nail extractor of claim 1 or 2, further comprising a rust loosening agent storage tank provided with a recovery port and an oil pump with an inlet end connected with the rust loosening agent storage tank, wherein the soil nail comprises a soil nail shell and a soil nail inner core, oil grooves are arranged on two opposite side surfaces of the soil nail inner core, the inner ends of the oil grooves on one side surface of the soil nail inner core are communicated with the inner ends of the oil grooves on the other side surface of the soil nail inner core through communication oil ducts, the outer ends of the oil grooves are exposed outside the soil nail shell, and the oil grooves are sealed by the soil nail shell to form oil holes; the outlet end of the oil pump is connected with one end of the output main pipe, and the other end of the output main pipe is connected with a plurality of spray heads.

4. The soil nail extractor according to claim 3, further comprising a temperature detection switch detecting a temperature of said grip round roller, said oil pump being started when the temperature detection switch detects that the temperature of the grip round roller reaches a set value; each clamping round roller is provided with the temperature detection switch, and all the temperature detection switches are connected in parallel; the temperature detection switch comprises an annular cavity which is arranged in the clamping round roller and extends along the circumferential direction of the clamping round roller, and a lead hole which is arranged in the center of the clamping roller and extends along the axial direction of the clamping roller, wherein a movable conducting ring and two fixed conducting rings are arranged in the annular cavity, the movable conducting rings are electrically connected together through the same fixed conducting rings, paraffin is filled in the annular cavity, the movable conducting rings are separated from the other fixed conducting rings at intervals under the isolation action of the paraffin, the paraffin is melted when the temperature of the clamping round roller reaches a set value, the movable conducting rings are pressed on the other fixed conducting rings under the action of the conducting springs after the paraffin is melted, so that the two fixed conducting rings are connected together through wires in a one-to-one correspondence manner, and the two conducting rods are arranged in a penetrating manner in the lead hole in a penetrating manner and are in conductive butt joint with the two conducting rods in a one-to-one correspondence manner.

5. The soil nail extractor of claim 4, wherein said clamping roller is of a metal construction, said stationary conductive ring is secured within said annular cavity by a thermally conductive insulating glue, said brushes are secured together with said clamping roller in an insulating manner, and said movable conductive ring is suspended within said annular cavity by said conductive spring.

6. The soil nail extractor of claim 4 wherein said fixed conductive ring is provided with a plurality of conductive pins, and said paraffin melts and then moves the conductive ring under the action of said conductive spring to contact said fixed conductive ring via said pins and press against the other fixed conductive ring.

7. The soil nail extractor of claim 1, wherein a clamping structure is provided with two clamping round rollers, the driving motor is a double-headed motor, driven gears are arranged at two ends of the clamping round rollers, driving gears are arranged on two power output shafts of the driving motor, the driving gears are meshed with two intermediate gears, the two intermediate gears are meshed with the driven gears on the two clamping round rollers in one-to-one correspondence, and the driven gears are rotatably connected to an intermediate gear connecting plate connected with a connecting seat.