Electromagnetic layered settlement monitoring mark ultra-deep hole lowering device

Abstract

An electromagnetic layered settlement monitoring mark ultra-deep hole lowering device comprises a lowering rod, a settlement magnetic ring and a winch, the lowering rod is sleeved with the settlement magnetic ring, a corresponding steel wire rope is arranged on the winch, and the winch is associated with the lowering rod through the steel wire rope and assists in cooperation with lowering work of the winch in a drill hole. The ultra-deep hole lowering device for the electromagnetic layered settlement monitoring mark is better in loading capacity and larger in lowering depth, the burying depth of the monitoring mark is increased, and the monitoring range of the monitoring mark is widened.

Description

Technical Field

[0001] The utility model belongs to the technical field of geological monitoring, and particularly relates to a device for lowering an electromagnetic layered settlement monitoring mark that can be used in ultra-deep holes. Background Technique

[0002] Layered settlement monitoring, as an effective means of soil layer settlement monitoring, is widely used. This method sets observation points in soil layers at different depths and uses high-precision measuring instruments to regularly measure the observation points, so as to obtain the settlement conditions of the soil layer at different depths. Then, by processing and analyzing these data, the stability of the soil layer is evaluated, and finally, the possible settlement deformation of the soil layer is predicted.

[0003] The existing monitoring methods mainly include: deep benchmark level method, electromagnetic settlement gauge method, fixed rod method, and series layered settlement gauge method, etc. Among them, the electromagnetic settlement gauge method uses a settlement magnetic ring as the monitoring mark. The settlement magnetic ring is sleeved on the settlement pipe and lowered into the borehole to the specified depth together with it. The commonly used settlement pipe is made of plastic material and is connected one by one. When connecting, a connecting sleeve of the same material is used to sleeve two settlement pipes and then fixed with self-tapping screws. The electromagnetic settlement gauge method is relatively commonly used because of its simple measurement method, convenient construction operation, small environmental impact, and strong geological adaptability. However, in the prior art, when observing a formation with a slightly larger buried depth, the electromagnetic settlement gauge method has different limitations in different borehole environments. The borehole environments mainly include dry holes and wet holes. When the borehole is a dry hole, the lowered settlement pipe often breaks due to its own weight being too large and exceeding the fixing ability of the self-tapping screws. The disconnected part falls to the bottom of the hole and cannot be taken out, which not only causes some economic losses but also produces a waste hole. When the borehole is a wet hole, due to the limitation of the settlement pipe material, it is not easy to lower in the slurry with a relatively large density. It is necessary to replace the wet hole slurry with clean water. However, in order to avoid borehole collapse, the slurry cannot be completely replaced with clean water in actual operation. The density of the slurry in the hole is greater than the density of the settlement pipe material itself. Under the action of its buoyancy, the deeper the borehole, the more difficult it is to lower the settlement pipe, so that it is impossible to ensure that the settlement pipe is lowered to the bottom of the hole. Moreover, under the action of the buoyancy and the downward pressure on the settlement pipe, it will cause the pipe material to bend and rub against the borehole wall, resulting in a borehole collapse accident.

[0004] To sum up, due to the limitations of the existing electromagnetic layered settlement monitoring structure, materials, and construction methods, its ultimate depth is only about 50m, which makes the buried depth of its monitoring mark relatively shallow, thus limiting its monitoring range. Moreover, as the borehole depth increases, the construction operation difficulty of burying the monitoring mark gradually increases. Finally, the lowering and burying of the existing monitoring marks are mostly manual operations, which require a large amount of manpower. Content of the Utility Model

[0005] The purpose of the present utility model is to provide an electromagnetic layered settlement monitoring marker lowering device for ultra-deep holes, so as to solve the technical problems that the existing electromagnetic settlement instrument monitoring markers are buried shallowly, resulting in a shallow monitoring range for soil layers, and the construction operation of burying deep borehole monitoring markers is difficult.

[0006] To achieve the above purpose, the specific technical solution of the present utility model is as follows:

[0007] An electromagnetic layered settlement monitoring marker ultra-deep hole lowering device includes a lowering rod, a settlement magnetic ring, and a winch. The settlement magnetic ring is sleeved on the lowering rod, and a corresponding steel wire rope is provided on the winch. The winch is associated with the lowering rod through the steel wire rope and assists in its lowering work in the borehole.

[0008] Further, the lowering rod includes a settlement tube and a pulley. The pulley is provided at the lower end of the settlement tube and can rotate freely below the settlement tube. There are multiple settlement tubes above the pulley, and the multiple settlement tubes are connected one by one. The settlement tube is a tubular body with a hollow interior. During construction, the number of settlement tubes is determined according to needs and they are assembled section by section as the construction progresses. The settlement tube at the bottommost end is the bottom settlement tube, and the pulley is fixedly connected below the bottom settlement tube. The lowering rod works in cooperation with the steel wire rope through the pulley, and the pulley and the steel wire rope form a movable pulley system to provide a supporting effect for the lowering of the lowering rod. The settlement magnetic ring is sleeved on the outer wall of the settlement tube, and the two are slidably connected. There are multiple settlement magnetic rings on the lowering rod from top to bottom.

[0009] Further, the settlement tubes are connected through corresponding sleeves. There are multiple screw holes corresponding to each other on the ends of the settlement tubes and the sleeves. After the connecting ends of adjacent settlement tubes are sleeved by the corresponding sleeves, they are fixedly connected by using the corresponding self-tapping screws.

[0010] Further, the inner diameter of the settlement magnetic ring is larger than the outer diameter of the settlement tube, and its inner diameter is smaller than the outer diameter of the sleeve. Multiple grippers are evenly distributed around the circumference of the outer ring of the settlement magnetic ring.

[0011] Further, the outside of the pulley is wrapped with a corresponding protective shell, the upper end of which is fixedly connected to the lower end of the bottom settlement tube, and its volume is slightly larger than that of the pulley. The pulley can rotate freely within the protective shell. It includes two split shells that are mirror images of each other along the center line in the front and back. The two split shells are combined with each other through corresponding bolts and connected to the pulley. The bolts also serve as the rotation axis of the pulley to support its rotation.

[0012] Further, the pulley is a V-shaped pulley made of stainless steel, and the steel wire rope cooperating with it is a square non-rotating steel wire rope.

[0013] Furthermore, a corresponding connecting rod is provided between the settling tube and the pulley. The connecting rod is a solid rod body, which adds weight to the lowering rod. The upper end of the connecting rod is correspondingly connected to the lower end of the bottom settling tube, and the lower end of the connecting rod is correspondingly connected to the pulley. The connections between the connecting rod and the bottom settling tube and the pulley are both fixed connections.

[0014] Furthermore, the lowering rod is made of a metal material that is not easily bent or deformed, and the connecting rod is a solid rod body made of metal.

[0015] Furthermore, a corresponding orifice protection tube is provided at the orifice of the drilling hole. The orifice protection tube includes a steel pipe and a flange. The outer diameter of the steel pipe corresponds to the inner diameter of the drilling hole, and its inner diameter is larger than the maximum outer diameter of the lowering rod. The lower end of the steel pipe is inserted into the drilling hole from the orifice of the drilling hole, and a corresponding flange plate is provided at the upper end of the steel pipe.

[0016] Furthermore, the winch adopts a single-drum single-rope winding winch. One end of the steel wire rope is connected and wound around the drum of the winch, and its free end is fixed by a corresponding steel drill.

[0017] The ultra-deep hole lowering device of the electromagnetic layered settlement monitoring mark of the present utility model reduces the probability of the lowering rod breaking during the lowering process, reduces the generation of waste holes, avoids the generation of some unnecessary economic losses, has a higher lowering work efficiency, smaller resistance during lowering, especially can withstand greater external pressure during wet hole lowering, a semi-automatic lowering method, requires less manpower, and the lowering of the lowering rod is more convenient and fast. The probability of causing drilling hole collapse during the lowering process is lower. Based on the above points, the drilling depth that the lowering rod can reach is greater, thereby increasing the embedding depth of the monitoring mark and improving the scope of electromagnetic layered settlement monitoring. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram when the present utility model is installed and constructed in a dry hole;

[0019] Figure 2 It is a schematic structural diagram when the present utility model is installed and constructed in a wet hole;

[0020] Explanation of the marks in the figure: 1. Lowering rod; 11. Settling tube; 12. Pulley; 13. Sleeve; 14. Self-tapping screw; 15. Bottom settling tube; 16. Protection shell; 17. Bolt; 18. Connecting rod; 2. Settling magnetic ring; 3. Winch; 4. Steel wire rope; 41. Steel drill; 5. Drilling hole; 6. Orifice protection tube. Detailed Embodiment

[0021] In order to better understand the purpose, structure and function of the present utility model, the following further describes in detail an ultra-deep hole lowering device of an electromagnetic layered settlement monitoring mark of the present utility model in conjunction with the drawings.

[0022] As Figure 1-2 shown, the ultra-deep hole lowering device of the electromagnetic layered settlement monitoring mark of the utility model includes a lowering rod 1, a settlement magnetic ring 2 and a winch 3. The settlement magnetic ring 2 is sleeved on the lowering rod 1, and a corresponding steel wire rope 4 is provided on the winch 3. The winch 3 is associated with the lowering rod 1 through the steel wire rope 4 and assists in its work. The lowering rod 1 is lowered into the corresponding borehole 5 preset at the observation point with the assistance of the winch 3 and the steel wire rope 4, so that the settlement magnetic ring 2 sleeved on its outside is lowered to the designated depth of the borehole 5 preset at the observation point together with it. At this time, the settlement magnetic ring 2 can cooperate with the corresponding settlement instrument to monitor the settlement of the soil layer at the observation point.

[0023] The lowering rod 1 includes a settlement pipe 11 and a pulley 12. The settlement magnetic ring 2 is sleeved on the periphery of the settlement pipe 11. The inner diameter of the settlement magnetic ring 2 is larger than the outer diameter of the settlement pipe 11, and the two are slidably connected. A plurality of grippers are evenly distributed around the outer circumference of the settlement magnetic ring 2. It grips the formation at the corresponding depth through the grippers, and then moves up and down with the settlement of the corresponding formation. The pulley 12 is arranged at the lower end of the settlement pipe 11, and the two are fixedly connected. The lowering rod 1 cooperates with the steel wire rope 4 through the pulley 12. The pulley 12 and the steel wire rope 4 form a movable pulley system to provide a supporting effect for the lowering of the lowering rod 1. During construction, the winch 3 is arranged on one side of the drill hole 5. One end of the steel wire rope 4 is wound around the winch 3, and the other corresponding end is its free end. After the free end of the steel wire rope 4 extends out of the winch 3, it then bypasses the groove of the pulley 12 and is finally fixed on the other side of the drill hole 5 opposite to the winch 3. In this embodiment, the winch 3 is arranged on the left side of the drill hole 5, and a steel drill 41 is provided on the ground on the right side of the drill hole 5 opposite to the winch 3. After the free end of the steel wire rope 4 bypasses in the groove of the pulley 12, it is fixed to the ground on the right side of the drill hole 5 through the steel drill 41, so that the steel wire rope 4 can bear the gravity of the lowering rod 1 when the lowering rod 1 is lowered in the drill hole 5, preventing the lowering rod 1 from breaking due to its excessive self-weight. Above the pulley 12, there are multiple settlement pipes 11. The multiple settlement pipes 11 are connected one by one. A corresponding sleeve 13 is provided at the connection of adjacent settlement pipes 11. A plurality of corresponding screw holes are provided at the end of the settlement pipe 11 and on the sleeve 13. After the connection ends of adjacent settlement pipes 11 are sleeved through the corresponding sleeve 13, the corresponding self-tapping screws 14 are used to sequentially pass through the screw holes of the corresponding sleeve 13 and the settlement pipe 11 to fixedly install the two together. The number of settlement pipes 11 can be flexibly selected according to the depth of the drill hole 5 during construction. The settlement pipe 11 at the bottommost end is the bottom settlement pipe 15. Before construction, the settlement pipes 11 are in a separated state. During construction, according to the needs and the lowering situation, the settlement pipes 11 are assembled and connected one by one according to the construction progress. The pulley 12 is arranged below the bottom settlement pipe 15 and can rotate freely below the settlement pipe 11. A plurality of settlement magnetic rings 2 are arranged on the lowering rod 1 from top to bottom. The number of settlement magnetic rings 2 and the distance between each settlement magnetic ring 2 can be flexibly adjusted according to the needs. The inner diameter of the settlement magnetic ring 2 is smaller than the outer diameter of the sleeve 13. The settlement magnetic rings 2 on the same settlement pipe 11 can slide between the sleeves at both ends of it.

[0024] Furthermore, the settlement pipe 11 is a tubular body with a hollow interior, which has a smaller self-weight, reducing the risk of breaking due to its excessive self-weight when being lowered in a dry hole. At the same time, during construction in a wet hole, the cavity inside the pipe can be drained by injecting water, thereby avoiding the difficulty of lowering due to excessive buoyancy it bears.

[0025] Further, a corresponding protective housing 16 is provided outside the pulley 12. The protective housing 16 wraps around the outside of the pulley 12 and has a volume slightly larger than that of the pulley 12. The pulley 12 can rotate freely within the protective housing 16. In this embodiment, the protective housing 16 is made of stainless steel and includes two corresponding front and rear sub-housings. The two sub-housings are mirror-symmetrical along the midline. The upper end of the protective housing 16 is fixedly connected to the lower end of the settlement pipe 15. A pair of corresponding bolt holes are provided at the lower part of the two sub-housings. The pulley 12 is arranged between the two sub-housings. A corresponding axle hole is provided at the axle center of the pulley 12. The axle hole corresponds to the bolt holes of the protective housing 16. The two sub-housings are combined with each other through corresponding bolts 17 passing through the bolt holes. The bolts 17 are fixedly connected to the two sub-housings. When the bolts 17 pass through the bolt holes, they simultaneously pass through the axle hole of the pulley 12, connecting the protective housing 16 and the pulley 12 together. The connection between the bolts 17 and the axle hole is a rotational connection. The bolts 17 serve as the rotation axis of the pulley 12 to support its rotation. During construction, the free end of the steel wire rope 4 passes through the protective housing 16 and is clamped into the groove of the pulley 12, and then fixed to the ground through the steel drill 41. The setting of the protective housing 16 can not only prevent large pieces of sediment from entering the pulley 12 and affecting its rotation performance, but also limit the steel wire rope 4 to prevent the steel wire rope 4 from slipping out of the groove of the pulley 12 during the lowering process of the lowering rod 1, thereby affecting the lowering of the lowering rod 1.

[0026] Further, the pulley 12 is a V-shaped pulley made of stainless steel, and its groove is V-shaped. The steel wire rope 4 that cooperates with it is a square non-rotating steel wire rope. This kind of steel wire rope 4 has high strength, good flexibility, does not form a gold hook, is not easy to knot, and has a long service life. Its square cross-section matches the groove of the V-shaped pulley more, and it is more stable during operation and not easy to slip out.

[0027] Further, the winch 3 is a single-drum single-rope winding winch. One end of the steel wire rope 4 is connected and wound around the drum of the winch 3. During construction, by controlling the rotation of the drum of the winch 3, the retraction and release of the steel wire rope 4 can be controlled, and thus the lowering of the lowering rod 1 can be controlled.

[0028] Furthermore, a corresponding connecting rod 18 is provided between the settling pipe 11 and the pulley 12. In this embodiment, the connecting rod 18 is a solid rod made of metal material, which serves to increase the counterweight for the lowering rod 1. Especially when the lowering device is applied to wet holes, the use of the connecting rod 18 is beneficial to overcome the buoyancy of the mud in the wet hole, making the lowering operation of the lowering rod 1 easier. The upper end of the connecting rod 18 is correspondingly connected to the lower end of the bottom settling pipe 15, and the lower end of the connecting rod 18 is correspondingly connected to the pulley 12. The connections between the connecting rod 18 and the bottom settling pipe 15 and the pulley 12 are both fixed connections. In this embodiment, the outer diameter of the connecting rod 18 corresponds to the inner diameter of the bottom settling pipe 15. Corresponding pin holes are provided in the lower part of the bottom settling pipe 15 and the upper part of the connecting rod 18. During construction and installation, the upper end of the connecting rod 18 is inserted into the interior of the bottom settling pipe 15 from the lower port thereof, and the two are fixedly connected by corresponding pins passing through the pin holes.

[0029] Furthermore, the lowering rod 1 is made of a metal material that is not easily bent or deformed to prevent it from bending due to excessive external forces during the lowering process, thereby reducing the occurrence of hole collapse accidents.

[0030] Furthermore, a corresponding hole mouth protection pipe 6 is provided at the hole mouth of the drill hole 5. The hole mouth protection pipe 6 includes a steel pipe and a flange. The steel pipe corresponds to the drill hole 5, and the outer diameter of the steel pipe matches the inner diameter of the drill hole 5. Its inner diameter is larger than the maximum outer diameter of the lowering rod 1. The lower end of the steel pipe is inserted into the drill hole 5 from the hole mouth of the drill hole 5. A corresponding flange plate is provided at the upper end of the steel pipe, and the bottom surface of the flange plate is attached to the upper surface of the soil layer around the hole mouth. During construction, the hole mouth protection pipe 6 is placed at the hole mouth of the drill hole 5 under the action of the flange plate and will not fall into the drill hole 5. Under the protection of the hole mouth protection pipe 6, the steel wire rope 4 will not directly contact the hole mouth of the drill hole 5, so that the upper opening of the drill hole 5 will not be damaged or collapsed due to the friction of the steel wire rope 4. The hole mouth protection pipe 6 forms a protective effect on the drill hole 5.

[0031] During installation and construction, first preset the corresponding borehole 5 at the position to be monitored, then place the borehole protection tube 6 at the upper mouth of the borehole 5, then place the winch 3 on one side of the borehole 5, and pass the free end of the wire rope 4 wound on the winch 3 through one side of the pulley 12 protective housing 16, and after the wire rope 4 is stuck in the wheel groove of the pulley 12, pass the free end of the wire rope 4 through the other side of the pulley 12 protective housing 16, and finally fix the free end of the wire rope 4 to the other side of the borehole 5 relative to the winch 3 through the steel drill 41. At this time, the lowering rod 1 can be lowered into the borehole 5 with the assistance of the winch 3 and the wire rope 4. When lowering, the end of the connecting rod 18 with the pulley 12 is first downward After entering the borehole 5, the bottom settlement pipe 11 gradually approaches and enters the borehole 5 as the connecting rod 18 descends. When the bottom settlement pipe 11 descends to the appropriate position of the borehole 5, a settlement pipe 11 is installed on it through the sleeve 13 and the self-tapping screw 14, and then the lowering rod 1 continues to be lowered to the appropriate position of the borehole 5, and then another settlement pipe 11 is installed on the upper part of the installed settlement pipe 11. In this way, each time a settlement pipe 11 is installed, the lowering rod 1 is controlled by the winch 3 to be lowered to a certain depth, and this process is repeated until the bottom end of the lowering rod 1 reaches the bottom of the borehole 5. In this process, the settlement magnetic ring 2 on the lowering rod 1 reaches the specified depth of the borehole 5 synchronously with its lowering, and passes through its outer ring. The clamp clamps the corresponding stratum, and at this time, the free end of the wire rope 4 fixed by the steel drill 41 can be loosened, and the wire rope 4 can be recovered by the winch 3. After the wire rope 4 is recovered, the orifice protection tube 6 at the orifice of the borehole 5 is taken out, and the lowering construction of the lowering rod 1 and the settlement magnetic ring 2 is completed. Subsequently, the gap in the borehole 5 can be filled, the hole is sealed, the settlement magnetic ring 2 is positioned, the monitoring sensor is installed, and the orifice protection is set. Other related work, such as setting, the installation and construction process of the ultra-deep hole lowering device of the electromagnetic layered settlement monitoring mark of the utility model is as follows when the hole is dry. When the construction environment is a wet hole, compared with the dry hole construction, the installation process is generally the same, and the main differences are as follows: First, after the borehole 5 is set, the lower rod 1 and the settlement magnetic ring 2 are lowered. Before the construction of the lowering device, it is necessary to replace the slurry in the borehole 5 with clean water. The purpose of this process is to reduce the density and viscosity of the slurry as much as possible without causing a hole collapse accident, thereby reducing the buoyancy generated by the slurry; secondly, the length of the connecting rod 18 used in the wet hole, the number of connecting pins between it and the bottom sedimentation pipe 15, and the spacing between the pins are all increased compared to the corresponding data of the corresponding components used in the dry hole, in order to increase its counterweight, which is more conducive to the lowering rod 1 to overcome the buoyancy of the mud; thirdly, as the lowering rod 1 is lowered, water is injected into the installed sedimentation pipe 11, in order to eliminate the cavity in the sedimentation pipe 11 and prevent it from being subjected to additional buoyancy.

[0032] The ultra-deep hole lowering device of the electromagnetic layered settlement monitoring mark of the utility model makes the lowering of the lowering rod 1 semi-automatic with the assistance of the winch 3 and the steel wire rope 4, saving manpower and preventing the lowering rod 1 from breaking when lowering in a dry hole, avoiding the economic loss caused by its breakage, and also avoiding the formation of abandoned holes caused thereby. Secondly, through the cooperation of the connecting rod 18 and the settlement pipe 11, the weight of the lowering rod 1 when lowering in a wet hole is increased, and the additional buoyancy is avoided, thereby reducing the difficulty of the lowering operation of the lowering rod 1. The use of the lowering rod 1 made of metal material in cooperation with the hole mouth protection pipe 6 reduces the occurrence of hole collapse accidents. Finally, through the above improvements, the ultra-deep hole lowering device of the electromagnetic layered settlement monitoring mark of the utility model can lower the settlement magnetic ring 2 into a deeper drill hole 5, thereby making the measurable range of the electromagnetic layered settlement monitoring method larger.

[0033] It can be understood that the present utility model is described through some embodiments. As is known to those skilled in the art, without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. An electromagnetic layered settlement monitoring marker ultra-deep hole lowering device, characterized in that: It comprises a lowering rod (1), a sinking magnetic ring (2) and a winch (3), wherein the sinking magnetic ring (2) is mounted on the lowering rod (1), the winch (3) is provided with a corresponding steel wire rope (4), the winch (3) is connected to the lowering rod (1) through the steel wire rope (4), and assists in the lowering work of the lowering rod in the borehole (5); The lowering rod (1) comprises a sedimentation tube (11) and a pulley (12), wherein the pulley (12) is arranged at the lower end of the sedimentation tube (11), the lowering rod (1) cooperates with the steel wire rope (4) through the pulley (12), the pulley (12) and the steel wire rope (4) form a movable pulley system, which provides support for the lowering of the lowering rod (1), and the sedimentation magnetic ring (2) is sleeved on the outer wall of the sedimentation tube (11), and the two are slidably connected; The winch (3) is a single-drum single-rope winding winch, and one end of the steel wire rope (4) is connected to and wound on the drum of the winch (3).

2. The ultra-deep hole lowering device for electromagnetic stratified settlement monitoring marker according to claim 1 is characterized in that: The pulley (12) can rotate freely below the sedimentation pipe (11). A plurality of sedimentation pipes (11) are arranged above the pulley (12). The plurality of sedimentation pipes (11) are connected one by one. The sedimentation pipes (11) are hollow tube-shaped bodies. During construction, the number of sedimentation pipes (11) is determined according to needs and they are assembled section by section as the construction progresses. The sedimentation pipe (11) at the bottom is the bottom sedimentation pipe (15). The pulley (12) is fixedly connected below the bottom sedimentation pipe (15). A plurality of sedimentation magnetic rings (2) are arranged from top to bottom on the lowering rod (1).

3. The ultra-deep hole lowering device for electromagnetic stratified settlement monitoring marker according to claim 2 is characterized in that: The settling pipes (11) are connected to each other via corresponding sleeves (13); a plurality of corresponding screw holes are provided on the ends of the settling pipes (11) and the sleeves (13); and the connecting ends of adjacent settling pipes (11) are fitted through corresponding sleeves (13) and then fixedly connected using corresponding self-tapping screws (14).

4. The ultra-deep hole lowering device for electromagnetic stratified settlement monitoring marker according to claim 3 is characterized in that: The inner ring size of the sedimentation magnetic ring (2) is larger than the outer diameter size of the sedimentation tube (11), and the inner ring size is smaller than the outer diameter size of the sleeve (13). The outer ring of the sedimentation magnetic ring (2) has a plurality of gripping clamps evenly distributed in the circumferential direction.

5. The ultra-deep hole lowering device for electromagnetic stratified settlement monitoring marker according to claim 2 is characterized in that: The pulley (12) is wrapped with a corresponding protective shell (16) on the outside, the upper end of which is fixedly connected to the lower end of the bottom sedimentation tube (15), and the volume of which is slightly larger than the pulley (12). The pulley (12) can rotate freely in the protective shell (16), and it includes two front and rear shells corresponding to each other along the midline mirror image. The two shells are combined with each other and connected to the pulley (12) through corresponding bolts (17). The bolts (17) also serve as the rotation axis of the pulley (12) to support its rotation.

6. The ultra-deep hole lowering device for electromagnetic stratified settlement monitoring marker according to claim 2 is characterized in that: The pulley (12) is a V-shaped pulley made of stainless steel, and the steel wire rope (4) working in conjunction with it is a square non-rotating steel wire rope.

7. The ultra-deep hole lowering device for electromagnetic stratified settlement monitoring marker according to claim 2 is characterized in that: A corresponding connecting rod (18) is provided between the sedimentation pipe (11) and the pulley (12); the connecting rod (18) is a solid rod body, which is used to increase the counterweight of the lowering rod (1); the upper end of the connecting rod (18) is correspondingly connected to the lower end of the bottom sedimentation pipe (15); the lower end of the connecting rod (18) is correspondingly connected to the pulley (12); and the connection between the connecting rod (18) and the bottom sedimentation pipe (15) and the pulley (12) is a fixed connection.

8. The ultra-deep hole lowering device for electromagnetic stratified settlement monitoring marker according to claim 7 is characterized in that: The lowering rod (1) is made of a metal material that is not easily bent or deformed, and the connecting rod (18) is a solid rod body made of metal.

9. The ultra-deep hole lowering device for electromagnetic stratified settlement monitoring marker according to claim 1 is characterized in that: A corresponding hole mouth protective tube (6) is provided at the hole mouth of the drill hole (5), and the hole mouth protective tube (6) comprises a steel pipe and a flange, wherein the outer diameter of the steel pipe corresponds to the inner diameter of the drill hole (5), and the inner diameter thereof is larger than the maximum outer diameter of the lowering rod (1), and the lower end of the steel pipe is inserted into the drill hole (5) from the hole mouth of the drill hole (5), and the upper end of the steel pipe is provided with a corresponding flange.

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