Electromagnetic method dynamic sounding equipment in deep hole and use method of electromagnetic method dynamic sounding equipment

Abstract

The invention discloses an electromagnetic method dynamic sounding device in a deep hole and a using method thereof, and belongs to the technical field of in-situ detection. Comprising a hammer tip, a hammer rod, a hammer seat, a hammer body, a sealing bin, a guide rod, a guide pipe and a cable, the hammer tip is installed at the lowermost end of the hammer rod through threads, the hammer seat is fixed to the upper end of the hammer rod, the sealing bin is fixedly sealed with the hammer seat and the guide rod, the guide rod is in threaded connection with the hammer rod, the guide rod penetrates through an annular structure of the hammer body, and the lower end of the guide pipe is in nested limiting connection with the guide rod. One end of the cable is connected with the upper end of the guide rod, the other end of the cable is connected with a power source above the ground, an electromagnetic coil is wound on the inner wall of the sealing bin and connected with the cable to be powered on, and depth scales are marked on the cable. The construction method comprises the following steps: preparing for construction; performing trepanning construction; lowering the dynamic sounding equipment; and detecting and constructing. The influence of the weight of the guide pipe on the footage is eliminated due to energy transmission loss.

Description

Technical Field

[0001] The invention belongs to the technical field of in-situ detection, and in particular relates to an electromagnetic dynamic probing device in a deep hole and a use method thereof. Background Art

[0002] Dynamic penetration testing is an in-situ testing method used to evaluate soil and geotechnical properties. The basic principle is to penetrate the probe into the soil layer through the impact force generated by the free fall of a heavy hammer, record the relationship between the penetration depth and the number of hammer strikes, and infer the mechanical properties of the soil layer. Dynamic penetration testing equipment usually consists of a heavy hammer, a guide rod, a probe and an automatic drop hammer system. The weight of the heavy hammer is selected in different levels according to requirements.

[0003] At present, conventional dynamic probing equipment is constructed above the ground. When the depth exceeds the 20m correction factor specified in the specification, it is necessary to drill a certain depth of the hole and then lengthen the probe rod for construction. There are two biggest disadvantages of this construction: First, as the number of holes increases, the probe rod above the soil is suspended until the ground. At this time, the point of action of the heavy hammer is on the ground, and the energy is transmitted to the hammer tip along the long rod. Due to the lack of constraints on the longer part of the probe rod, the energy is lost during the transmission process, resulting in a larger measurement result; second, the specification requires that the length correction factor of the probe rod is 20m. After the hole is drilled, the length of the probe rod increases significantly, and the weight of the overall equipment increases. Under the same hammering action, the penetration is faster, resulting in a smaller measurement result. In summary, further research is still needed for ultra-deep dynamic probing technology. In order to eliminate the influence of energy loss and probe rod weight, the present invention proposes a deep hole electromagnetic dynamic probing equipment and its use method. Automatic control is achieved by transferring the equipment into the deep hole and using electromagnetic method to control the automatic fall and rise of the hammer body.

[0004] Chinese invention patent CN109238826A introduces an electromagnetic sounding device and a control method for the current of its power coil, which includes a positioning sleeve, a drop weight bearing block that slides with the positioning sleeve, a sounding rod that is integrated with the drop weight bearing block, and a power magnetic block and a columnar drop weight that are sequentially mounted on the sounding rod corresponding to the part above the drop weight bearing block from top to bottom. The power magnetic block and the drop weight are fixedly connected as one and both cooperate with the sliding guide of the positioning sleeve; the lower end of the sounding rod extends out of the positioning sleeve, the bottom end of the sounding rod is a sounding probe, and a sounding plate is screwed on the sounding probe; the part above the power magnetic block in the positioning sleeve is fixedly mounted with a power coil that can generate an electromagnetic field. The invention uses electromagnetic force as the power, overcomes the shortcomings of the original gravity sounding device system that is bulky and difficult to install and carry, and overcomes the empirical error of the original device system when measuring. The device of the present invention uses a current control method during use, which can accurately control the magnitude and height of the force of the drop weight falling, and ensures the reliability of the measurement result.

[0005] Although the above invention uses the electromagnetic method to replace the original heavy hammer structure, the specific controlled current is obtained through theoretical calculation, without fully considering the actual situation, which may lead to a mismatch between the theoretically calculated current and the actual use. In addition, the use conditions of the above invention are still above the ground. To solve the artificial error, only the fall of the hammer body is considered, without considering the need for the hammer body to reciprocate. Therefore, this method does not completely solve the engineering problem, but only stays at the theoretical level.

[0006] The premise of the present invention is to solve the problem of automatically realizing dynamic penetration in the hole. Although the principles adopted are all electromagnetic methods, there are significant differences. In addition, there are also significant differences in the structural form and usage method. Therefore, the present invention solves the problem of automatically controlling the falling and rising of the hammer body by using the electromagnetic method in deep holes, realizing automatic control. Summary of the Invention

[0007] In view of the above technical problems existing in the prior art, the present invention proposes a deep-hole electromagnetic method dynamic penetration testing device and its usage method, which overcomes the deficiencies of the prior art. By transferring the dynamic penetration testing device into the deep hole, the influence of energy loss and the weight of the drill rod is eliminated; by using the electromagnetic method to control the automatic falling and rising of the hammer body, automatic control is realized; by setting a sliding nested connection between the guide rod and the guide tube, the influence of the weight of the guide tube on the penetration is eliminated, and at the same time, the guiding effect of the guide tube on the guide rod is ensured.

[0008] To achieve the above object, the present invention adopts the following technical solutions: A deep-hole electromagnetic method dynamic penetration testing device includes a hammer tip, a hammer rod, a hammer seat, a hammer body, a sealed chamber, a guide rod, a guide tube, and a cable. The hammer tip is installed at the lowermost end of the hammer rod through a thread. The hammer seat is fixed at the upper end of the hammer rod. The sealed chamber is fixedly sealed with the hammer seat and the guide rod. The guide rod is connected to the hammer rod by a thread. The hammer body is of an annular structure. The guide rod passes through the annular structure of the hammer body. The lower end of the guide tube is nested and limitedly connected to the guide rod. One end of the cable is connected to the upper end of the guide rod, and the other end is connected to a power supply above the ground. An electromagnetic coil is wound on the inner wall of the sealed chamber, and the coil is connected to the cable to be energized. The cable is marked with depth scales.

[0009] Preferably, the hammer body is composed of two parts, an upper magnetic structure and a lower cemented carbide structure. The sealed chamber is in a vacuum, semi-vacuum or natural air pressure state.

[0010] Preferably, the upper half of the guide tube is of a thin-wall structure, and the overlapping section of the guide tube and the guide rod is of a thick-wall structure. The thickness of the thin-wall structure is 2-4 mm, and the thickness of the thick-wall structure is 4-8 mm.

[0011] Preferably, a guiding groove is preset on the thick-walled section of the guiding tube, and a corresponding protrusion is preset at the upper end of the guiding rod. The two are fitted together and slide relative to each other. There is also a limit between the guiding tube and the guiding rod, that is, a limiting mechanism is provided at the uppermost end of the guiding rod and the lowermost end of the guiding tube to ensure that the two will not become disengaged.

[0012] Preferably, according to the depth requirement, multiple hammer rods are lengthened by threaded connection.

[0013] Preferably, the diameter of the deep hole is 200 mm - 1500 mm, and the structural forms of the hammer body and the sealing chamber are adjusted according to the diameter of the deep hole.

[0014] A method for using an electromagnetic dynamic penetration testing device in a deep hole is carried out in the following steps: Step 1: Construction preparation According to the designed opening diameter and opening depth of the deep hole, select the structural forms of the hammer body and the sealing chamber, determine the lengths of the guiding tube and the cable, and determine the number and length of the hammer rods; Step 2: Opening construction Open a hole according to the depth and diameter to be tested. The opening depth is 1 m - 2 m away from the depth to be tested; Step 3: Lower the dynamic penetration testing device Assemble the dynamic penetration testing device and lower it to the bottom of the hole. The hammer tip enters the soil at the bottom of the opening hole. Sufficient sliding space is reserved between the guiding tube and the guiding rod. The guiding tube is fixed by an external force at the hole opening position, and the cable is straightened for measuring the hammering depth; Step 4: Detection construction Apply electricity to the upper electromagnetic coil and the lower electromagnetic coil through the cable. The hammer body falls and rises under the action of electromagnetic force and gravity until the hammer tip enters the position of the soil to be tested. Record the number of times the hammer body hits the hammer seat, and at the same time record the length of the measuring rope descending until reaching the set depth and then stop.

[0015] Preferably, apply electricity to the upper electromagnetic coil and the lower electromagnetic coil through the cable. The specific electricity application method and current magnitude are determined by using the data in the database. The method for establishing the database is as follows: (1) Measure the speed V at which a heavy hammer in the air freely falls at a specified height in the standard. The heavy hammer includes three types: 10 kg, 63.5 kg, and 120 kg, and the heavy hammer falls onto the hammer seat; (2) Pass different forward currents through the electromagnetic coil through the cable. Measure the speed A of the hammer body moving to the position of the hammer seat under the action of the electromagnetic force of the electromagnetic coil within the height of the sealing chamber under vacuum conditions, and the initial speed B of the hammer body moving in the reverse direction after being impacted by the hammer seat. B is at least 0; (3) Pass different reverse currents through the electromagnetic coil via a cable, and measure the velocity C of the hammer body at the top position of the sealed chamber under the action of the electromagnetic force of the electromagnetic coil within the height of the sealed chamber in a vacuum, semi-vacuum or natural atmospheric pressure state. (4) When the momentum difference of the hammer body under the conditions of velocity A and velocity B is equal to the momentum of the heavy hammer under the condition of velocity V, the current passed through the electromagnetic coil at this time is the forward standard current; when the velocity C of the hammer body is zero, the current passed through the electromagnetic coil at this time is the reverse standard current. (5) Change the model of the heavy hammer, change the mass of the hammer body and the height of the sealed chamber, and repeat the test according to the process of steps (1)-(4) to determine the upper standard current and the lower standard current in all cases, and establish a database.

[0016] The beneficial technical effects brought by the present invention: By transferring the dynamic penetration equipment into the deep hole, the influence of energy loss and the weight of the drill rod is eliminated; by adopting the electromagnetic method to control the automatic falling and rising of the hammer body, automatic control is realized; by setting a sliding nested connection between the guide rod and the guide tube, the influence of the weight of the guide tube on the penetration depth is eliminated, and at the same time, the guiding effect of the guide tube on the guide rod is ensured. Description of the Drawings

[0017] Figure 1 It is a schematic cross-sectional view of the overall structure of an electromagnetic method dynamic penetration equipment and its usage method in a deep hole according to the present invention.

[0018] Among them, 1 - hammer tip, 2 - hammer rod, 3 - hammer seat, 4 - hammer body, 5 - sealed chamber, 6 - guide rod, 7 - guide tube, 8 - cable. Specific Embodiments

[0019] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments: Embodiment 1:

[0020] As Figure 1 shown, an electromagnetic method dynamic penetration equipment in a deep hole includes a hammer tip 1, a hammer rod 2, a hammer seat 3, a hammer body 4, a sealed chamber 5, a guide rod 6, a guide tube 7, and a cable 8. The hammer tip 1 is installed at the lowermost end of the hammer rod 2 by threads, the hammer seat 3 is fixed at the upper end of the hammer rod 2, the sealed chamber 5 is fixedly sealed with the hammer seat 3 and the guide rod 6, the guide rod 6 is connected to the hammer rod 2 by threads, the hammer body 4 is of an annular structure, the guide rod 6 passes through the annular structure of the hammer body 4, the lower end of the guide tube 7 is nested and limitedly connected to the guide rod 6, one end of the cable 8 is connected to the upper end of the guide rod 6, and one end is connected to a power supply above the ground. An electromagnetic coil is wound on the inner wall of the sealed chamber 5, and the coil is connected and energized with the cable 8. The cable 8 is marked with depth scales.

[0021] Preferably, the hammer body 4 is composed of two parts, the upper magnet structure and the lower cemented carbide structure, and the sealed chamber 5 is in a vacuum, semi-vacuum or natural air pressure state.

[0022] Preferably, the upper half of the alignment tube 7 is a thin-wall structure, and the overlapping section of the alignment tube 7 and the guide rod 6 is a thick-wall structure. The thickness of the thin-wall structure is 2-4 mm, and the thickness of the thick-wall structure is 4-8 mm.

[0023] Preferably, a guide groove is preset on the thick-wall section of the alignment tube 7, and a corresponding protrusion is preset at the upper end of the guide rod 6. The two are fitted together and slide relative to each other. There is also a limit between the alignment tube 7 and the guide rod 6, that is, a limit mechanism is provided at the uppermost end of the guide rod 6 and the lowermost end of the alignment tube 7 to ensure that the two will not become disengaged.

[0024] Preferably, according to the depth requirement, multiple hammer rods 2 are connected and lengthened by threads.

[0025] Preferably, the diameter of the deep hole is 200 mm - 1500 mm, and the structural forms of the hammer body 4 and the sealed chamber 5 are adjusted according to the diameter of the deep hole.

[0026] A method for using an electromagnetic method dynamic penetration testing device in a deep hole is carried out by the following steps: Step 1: Construction preparation According to the designed opening diameter and opening depth of the deep hole, select the structural forms of the hammer body 4 and the sealed chamber 5, determine the lengths of the alignment tube 7 and the cable 8, and determine the number and length of the hammer rods 2; Step 2: Opening construction Open a hole according to the depth and diameter to be tested. The opening depth is 1 m - 2 m away from the depth to be tested; Step 3: Lower the dynamic penetration testing device Assemble the dynamic penetration testing device and lower it to the bottom of the hole. The hammer tip 1 enters the soil body at the bottom of the opening. Sufficient sliding space is reserved between the alignment tube 7 and the guide rod 6. The alignment tube 7 is fixed by an external force at the hole opening position, and the cable 8 is straightened for measuring the hammering depth; Step 4: Detection construction Apply electricity to the upper electromagnetic coil and the lower electromagnetic coil through the cable 8. The hammer body 4 falls and rises under the action of electromagnetic force and gravity until the hammer tip 1 enters the soil body to be tested. Record the number of times the hammer body 4 hits the hammer seat 3, and at the same time record the length of the measuring rope dropped until reaching the set depth and then stop.

[0027] Preferably, apply electricity to the upper electromagnetic coil and the lower electromagnetic coil through the cable 8. The specific power-on method and current magnitude are determined using the data in the database. The method for establishing the database is as follows: (1) Measure the free fall of the plumb bob in the air at the height specified by the standard. The plumb bobs include three types with weights of 10 kg, 63.5 kg, and 120 kg, and measure the velocity V of the plumb bob hitting the hammer base 3. (2) Pass different forward currents through the electromagnetic coil via the cable 8. Measure the velocity A of the hammer body 4 moving to the position of the hammer base 3 under the action of the electromagnetic force of the electromagnetic coil within the height of the sealed chamber 5 in a vacuum, semi-vacuum, or natural atmospheric pressure state. Measure the initial velocity B of the hammer body 4 moving in the reverse direction after being impacted by the hammer base 3, and B is at least 0. (3) Pass different reverse currents through the electromagnetic coil via the cable 8. Measure the velocity C of the hammer body 4 moving to the top position of the sealed chamber 5 under the action of the electromagnetic force of the electromagnetic coil within the height of the sealed chamber 5 under vacuum conditions. (4) When the momentum difference between the hammer body 4 under the conditions of velocity A and velocity B is equal to the momentum of the plumb bob under the condition of velocity A, the current passed through the electromagnetic coil at this time is the forward standard current; when the velocity C of the hammer body 4 is zero, the current passed through the electromagnetic coil at this time is the reverse standard current. (5) Change the type of plumb bob, change the mass of the hammer body 4 and the height of the sealed chamber 5, and repeat the test according to the process of steps (1)-(4) to determine the upper standard current and the lower standard current in all cases and establish a database. Embodiment 2:

[0028] As Figure 1 shown, a dynamic penetration testing device using electromagnetic method in deep holes includes a hammer tip 1, a hammer rod 2, a hammer base 3, a hammer body 4, a sealed chamber 5, a guide rod 6, a guiding tube 7, and a cable 8. The hammer tip 1 is installed at the lowermost end of the hammer rod 2 by threads. The hammer base 3 is fixed at the upper end of the hammer rod 2. The sealed chamber 5 is fixedly sealed with the hammer base 3 and the guide rod 6. The guide rod 6 is connected to the hammer rod 2 by threads. The hammer body 4 is of an annular structure. The guide rod 6 passes through the annular structure of the hammer body 4. The lower end of the guiding tube 7 is nested and limitedly connected to the guide rod 6. One end of the cable 8 is connected to the upper end of the guide rod 6, and the other end is connected to a power source above the ground. An electromagnetic coil is wound on the inner wall of the sealed chamber 5, and the coil is connected to the cable 8 for power supply. The cable 8 is marked with depth scales. The biggest difference between the overall dynamic penetration testing device and the conventional dynamic penetration testing device is that by changing the structures of the hammer body 4 and the sealed chamber 5, it becomes a slender structure when in a small-diameter hole and a short and thick structure when in a large-diameter hole to adapt to the hole environment; the calibration speed measurement and calibration are carried out above the ground, that is, measure the energy of the plumb bob hitting the hammer base 3 under different plumb bob conditions and compare it with the energy of the hammer body 4 hitting the hammer base 3 under vacuum conditions in the sealed chamber 5. Determine the current required for the electromagnetic force by the equality of energy, and after the impact, it rebounds until the velocity decreases to 0 and returns to the original position where it just fell, that is, the electrical energy provides energy loss to promote the conversion between kinetic energy and potential energy.

[0029] Preferably, the hammer body 4 is composed of two parts, the upper magnet structure and the lower cemented carbide structure. The inside of the sealed chamber 5 is in a vacuum, semi-vacuum or natural air pressure state. The large stiffness of the hammer body 4 is to ensure that it will not deform during impact, causing unnecessary energy loss. The vacuum state is to eliminate the energy consumption caused by air resistance.

[0030] Preferably, the upper half of the alignment tube 7 is a thin-walled structure, and the overlapping section of the alignment tube 7 and the guide rod 6 is a thick-walled structure. The thickness of the thin-walled structure is 2-4 mm, and the thickness of the thick-walled structure is 4-8 mm. The upper half being a thin wall is also to reduce the mass, and the lower half being thick wall is to ensure a certain strength after grooving.

[0031] Preferably, guide grooves are preset on the thick-walled section of the alignment tube 7, and corresponding protrusions are preset at the upper end of the guide rod 6. The two are fitted together and slide relative to each other. There is also a limit between the alignment tube 7 and the guide rod 6, that is, a limiting mechanism is provided at the uppermost end of the guide rod 6 and the lowermost end of the alignment tube 7 to ensure that the two will not become disengaged.

[0032] Preferably, according to the depth requirement, multiple hammer rods 2 are connected and lengthened by threads.

[0033] Preferably, the diameter of the deep hole is 200 mm - 1500 mm, and the structural forms of the hammer body 4 and the sealed chamber 5 are adjusted according to the diameter of the deep hole.

[0034] A method for using an electromagnetic dynamic penetration testing device in a deep hole is carried out in the following steps: Step 1: Construction preparation According to the designed opening diameter and opening depth of the deep hole, select the structural forms of the hammer body 4 and the sealed chamber 5, determine the lengths of the alignment tube 7 and the cable 8, and determine the number and length of the hammer rods 2; Step 2: Opening construction Open a hole according to the depth and diameter to be tested. The depth of the opening is 1 m - 2 m away from the depth to be tested; maintaining a certain distance is to ensure that the soil within the depth to be measured will not be disturbed.

[0035] Step 3: Lower the dynamic penetration testing device Assemble the dynamic penetration testing device and lower it to the bottom of the hole. The hammer tip 1 enters the soil at the bottom of the opening hole. Sufficient sliding space is reserved between the alignment tube 7 and the guide rod 6. The alignment tube 7 is fixed by an external force at the hole opening position, and the cable 8 is straightened for measuring the hammering depth; Step 4: Detection construction Electricity is passed through the upper and lower electromagnetic coils via the cable 8. The hammer body 4 falls and rises under the action of electromagnetic force and gravity until the hammer tip 1 enters the position of the soil to be measured. The number of times the hammer body 4 strikes the hammer base 3 is recorded, and at the same time, the length of the measuring rope descending is recorded until it stops after reaching the set depth.

[0036] Preferably, electricity is passed through the upper and lower electromagnetic coils via the cable 8. The specific power-on method and current magnitude are determined using the data in the database. The method for establishing the database is as follows: (1) Measure the speed V at which a heavy hammer freely falls in the air at the height specified by the standard, where the heavy hammers include three types: 10 kg, 63.5 kg, and 120 kg, and the heavy hammer falls onto the hammer base 3. (2) Pass different forward currents through the electromagnetic coil via the cable 8, and measure the speed A at which the hammer body 4 moves to the position of the hammer base 3 under the action of the electromagnetic force of the electromagnetic coil within the height of the sealed chamber 5 under vacuum conditions. Measure the initial speed B at which the hammer body 4 moves in the reverse direction after being impacted by the hammer base 3, and B is at least 0. (3) Pass different reverse currents through the electromagnetic coil via the cable 8, and measure the speed C at which the hammer body 4 moves to the top position of the sealed chamber 5 under the action of the electromagnetic force of the electromagnetic coil within the height of the sealed chamber 5 under vacuum, semi-vacuum, or natural atmospheric pressure conditions. (4) When the momentum difference between the hammer body 4 under the conditions of speed A and speed B is equal to the momentum of the heavy hammer under the condition of speed A, the current passed through the electromagnetic coil at this time is the forward standard current; when the speed C of the hammer body 4 is zero, the current passed through the electromagnetic coil at this time is the reverse standard current. (5) Change the type of heavy hammer, change the mass of the hammer body 4 and the height of the sealed chamber 5, and repeat the test according to the process of steps (1)-(4) to determine the upper standard current and the lower standard current in all cases, and establish a database.

[0037] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "set" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0038] Certainly, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the essence of the present invention also fall within the protection scope of the present invention.

Claims

1. A deep hole electromagnetic dynamic penetration equipment, characterized in that: It includes a hammer tip, a hammer rod, a hammer seat, a hammer body, a sealing chamber, a guide rod, a guide tube, and a cable. The hammer tip is installed at the lower end of the hammer rod through a thread, the hammer seat is fixed to the upper end of the hammer rod, the sealing chamber is fixedly sealed with the hammer seat and the guide rod, the guide rod and the hammer rod are connected by threads, the hammer body is an annular structure, the guide rod passes through the annular structure of the hammer body, the lower end of the guide tube is nested and limitedly connected to the guide rod, one end of the cable is connected to the upper end of the guide rod, and the other end is connected to the power supply above the ground, an electromagnetic coil is wound on the inner wall of the sealing chamber, the coil is connected to the cable and energized, and the cable is marked with a depth scale.

2. The deep hole electromagnetic dynamic penetration equipment according to claim 1, characterized in that: The hammer body is composed of two parts, an upper magnet structure and a lower hard alloy structure. The sealed chamber is in a vacuum, semi-vacuum or natural air pressure state.

3. The deep hole electromagnetic dynamic penetration equipment according to claim 1 is characterized in that: The upper part of the guide tube is a thin-walled structure, and the overlapping section of the guide tube and the guide rod is a thick-walled structure. The thickness of the thin-walled structure is 2-4 mm, and the thickness of the thick-walled structure is 4-8 mm.

4. The deep hole electromagnetic dynamic penetration equipment according to claim 1, characterized in that: A guide groove is preset on the thick-walled section of the guide tube, and a corresponding protrusion is preset on the upper end of the guide rod. The two are embedded together and slide relative to each other. There is also a limit between the guide tube and the guide rod, that is, a limit mechanism is set at the uppermost end of the guide rod and the lowermost end of the guide tube to ensure that the two will not be disengaged.

5. The deep hole electromagnetic dynamic penetration equipment according to claim 1, characterized in that: According to the depth requirement, multiple hammer rods are lengthened by threaded connection.

6. The deep hole electromagnetic dynamic penetration equipment according to claim 1, characterized in that: The diameter of the deep hole is 200mm-1500mm, and the structural forms of the hammer body and the sealing chamber are adjusted according to the diameter of the deep hole.

7. A method for using an electromagnetic dynamic penetration device in a deep hole, characterized in that: The construction is carried out in the following steps: Step 1: Construction preparation According to the designed deep hole opening diameter and opening depth, select the structure of the hammer body and sealing chamber, determine the length of the guide tube and cable, and determine the number and length of the hammer rod; Step 2: Drilling Drill holes according to the depth and diameter to be tested. The depth of the holes should be 1m-2m away from the depth to be tested. Step 3: Lower the dynamic penetration equipment The dynamic penetration equipment is assembled and lowered to the bottom of the hole. The hammer tip enters the soil at the bottom of the hole. Sufficient sliding space is reserved between the guide tube and the guide rod. The guide tube is fixed at the hole mouth by external force. The cable is stretched straight to measure the penetration depth of the hammer. Step 4: Inspection and construction Power is supplied to the upper and lower electromagnetic coils through the cable, and the hammer falls and rises under the action of electromagnetic force and gravity until the hammer tip enters the soil position to be measured. The number of times the hammer hits the hammer seat is recorded, and the length of the measuring rope that has descended is also recorded until it reaches the set depth and stops.

8. The method for using the deep hole electromagnetic dynamic penetration equipment according to claim 7, characterized in that: The upper electromagnetic coil and the lower electromagnetic coil are energized through the cable. The specific energization method and current size are determined by the data in the database. The method for establishing the database is as follows: (1) Measure the velocity V of a weight falling freely in the air at the height specified in the specification. The weights include 10 kg, 63.5 kg, and 120 kg. (2) Pass different positive currents through the electromagnetic coil through the cable, and measure the speed A of the hammer body moving to the position of the hammer seat under the electromagnetic force of the electromagnetic coil in the vacuum, semi-vacuum or natural air pressure state within the sealed chamber height, and the initial speed B of the hammer body moving in the reverse direction after being hit by the hammer seat, and the minimum value of B is 0; (3) Different reverse currents are passed through the electromagnetic coil through the cable, and the speed C of the hammer moving to the top of the sealed chamber under the electromagnetic force of the electromagnetic coil under vacuum conditions is measured; (4) When the momentum difference between the hammer at speed A and speed B is equal to the momentum of the hammer at speed V, the current flowing through the upper electromagnetic coil is the positive standard current; when the hammer speed C is zero, the current flowing through the lower electromagnetic coil is the negative standard current; (5) Change the weight hammer model, change the hammer mass and the height of the sealing chamber, repeat the test according to steps (1) to (4), determine the upper standard current and the lower standard current in all cases, and establish a database.

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