Penetration resistance measuring device

Abstract

To provide a measurement device of penetration resistance force capable of simulatively measuring friction force on a peripheral surface of a shield machine and injecting lubricant into a simulated ground.SOLUTION: A measurement device of penetration resistance force includes: a rotary table 10; a cylindrical soil tank 20 fixed to the rotary table 10; a loading body 40 placed on a simulated ground (a ground test piece 2) provided in the cylindrical soil tank 20; and a penetration unit 50 that penetrates the loading body 40 and being penetrated into the simulated ground. The penetration unit 50 includes: a cylindrical body 51; a push-in force generation unit 52 provided on an upper portion of a cylindrical body 51; a torque measurement unit 53 for measuring a torque value that is generated when the cylindrical body 51 is penetrated into the simulated ground rotating together with the rotary table 10; and a lubricant injection unit 54 for injecting lubricant into the simulated ground.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a device for measuring penetration resistance force. [Background technology]

[0002] For example, Patent Document 1 shows a measuring device that simulates the penetration resistance force of a shield machine into the excavated ground. This measuring device is equipped with a test soil tank containing a model ground on a centrifugal load device, and measures the earth pressure acting on a 1 / n-scale tunnel lining model in a centrifugal acceleration field that is n times the gravitational acceleration. The tunnel lining model is inserted into an outer tube with a thickness of 1 / n of the thickness of the tail void generated in actual construction. This outer tube can be inserted and removed through an opening provided on the side of the test soil tank. A sensor that detects the load acting on the lining is attached to the outer periphery of the tunnel lining model. The tunnel lining model is inserted into the model ground while rotating a cutter disk and a mud discharge screw attached to the tip of the tunnel lining model, and when it has entered the model ground by a predetermined amount, the insertion is stopped, the outer tube is removed, and the lining load is detected by the sensor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-29297 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, with shield tunneling machines, there are cases where one wishes to know the frictional force (body clamping force) generated on the periphery of the shield machine due to the jamming phenomenon, or the effect of reducing frictional force by injecting a lubricant; however, the measuring device in Patent Document 1 measures the earth pressure acting on the tunnel lining, and does not measure the frictional force on the periphery of the shield machine, nor does it inject a lubricant. From this viewpoint, the present invention aims to provide a penetration resistance measuring device that can simulate the frictional force on the peripheral surface of a shield machine and can inject a slippery material into the simulated ground. [Means for solving the problem]

[0005] In order to solve such problems, the present invention provides a penetration resistance measuring device that includes a rotating table, a cylindrical soil tank fixed to the rotating table, a load placed on a simulated ground provided in the cylindrical soil tank, and a penetration part that penetrates the load into the simulated ground. The penetration part includes a cylinder, a pushing force generating part provided on the upper part of the cylinder, a torque measuring part that measures a torque value generated when the cylinder is penetrated into the simulated ground that rotates together with the rotating table, and a lubricant injecting part that injects a lubricant into the simulated ground. According to the penetration resistance measuring device of the present invention, the frictional force of the peripheral surface of the shield machine can be simulated and measured by the torque measuring unit. In addition, since the cylindrical soil tank rotates but the penetration part does not rotate, a lubricant injection part can be formed in the penetration part. This makes it possible to inject lubricant into the simulated ground.

[0006] In the penetration resistance measuring device of the present invention, it is preferable that the tip surface of the cylinder has a tapered shape that protrudes downward toward the center of the cylinder. With such a configuration, when the cylinder is penetrated into the simulated ground, the soil moves toward the outer peripheral surface of the cylinder, so that the earth pressure on the outer peripheral surface of the cylinder increases. Therefore, jamming is likely to occur. In the penetration resistance measuring device of the present invention, it is preferable that the lubricant injection section includes an injection hole formed on the side surface of the cylinder and an injection tube connected to the injection hole. With this configuration, the lubricant can be injected from a desired position on the cylinder. In the penetration resistance measuring device of the present invention, Inside the cylinder, The injection hole located at the tip of the cylindrical body than the cylindrical bodyIt is preferable that a soil protection section is formed at the tip side of the injection pipe to protect the soil of the simulated ground from the positions of the injection hole and the injection pipe. With this configuration, it is possible to prevent the injection hole and the injection pipe from being worn down by the soil. In the penetration resistance measuring device of the present invention, it is preferable that a lid is provided on the upper end of the cylindrical soil tank, and a pressure tube is interposed between the container and the lid. With this configuration, the expansion pressure of the pressure tube can be converted into a pressure force for pressing the simulated ground. In the measurement device for measuring the penetration resistance of the present invention, it is preferable that the load has a plurality of through holes. With such a configuration, the slipper injected into the simulated ground can escape above the load. In the penetration resistance measuring device of the present invention, the tip of the cylindrical body is provided with: From the outside Spread outwards Multiple The cutter part is formed The plurality of cutter portions are arranged at predetermined intervals along the circumferential direction of the cylindrical body. According to such a configuration, it is possible to simulate an overcutter. In the device for measuring the penetration resistance of the present invention, it is preferable that a bearing device that rotates together with the cylindrical soil tank and supports the cylinder so that the cylinder can rotate and ascend and descend relatively is provided at the upper end of the cylindrical soil tank. With this configuration, a non-rotating cylinder can be inserted into the simulated ground that rotates together with the cylindrical soil tank. In the penetration resistance measuring device of the present invention, it is preferable that the pressure tube is formed in an annular shape, and a cylindrical case that surrounds the cylindrical body is provided inside the pressure tube. With this configuration, the pressure tube does not press the cylindrical body, so no frictional force is generated between the pressure tube and the cylindrical body, and the rotation of the cylindrical soil tank is not hindered. Effect of the Invention

[0007] According to the penetration resistance measuring device of the present invention, it is possible to simulate the measurement of the frictional force on the peripheral surface of a shield machine and to inject a slippery material into the simulated ground. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing a penetration resistance force measuring device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged cross-sectional view showing the lower end of a cylindrical body of a penetration resistance measuring device according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a cross-sectional view showing a state in which a cylindrical body is penetrated by the penetration resistance measuring device according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The penetration resistance measuring device according to the embodiment of the present invention will be described with reference to the attached drawings. The penetration resistance measuring device according to the present embodiment is a device for simulating and measuring the penetration resistance of a shield tunneling machine into excavated ground, reproducing the body tightening effect caused by jamming around the shield machine and around the thrust pipe, and obtaining vibration conditions and thrust resistance in indoor tests. The measuring device according to the present embodiment can confirm the effect of filling a slippery material around the shield machine. FIG. 1 is a cross-sectional view showing the penetration resistance measuring device according to the embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view showing the lower end of the cylinder of the penetration resistance measuring device.

[0010] As shown in FIG. 1, the penetration resistance force measuring device 1 of this embodiment includes a rotary table 10, a cylindrical soil tank 20, a load 40, and a penetration section 50. The rotary table 10 is a base on which the cylindrical soil tank 20 is placed, and includes a table main body 11 and a rotating shaft 12. The table main body 11 is disk-shaped. A female screw (not shown) is formed on the upper surface of the table main body 11. The tip of a bolt for fixing the cylindrical soil tank 20 to the rotary table 10 is screwed into the female screw. The rotating shaft 12 is fixed to the lower end of the table main body 11 and hangs down. The rotating shaft 12 is rotatably supported by a bearing (not shown). A sprocket 13 is fixed to the rotating shaft 12. A drive motor 14 is provided next to the rotating shaft 12. A drive belt 16 is stretched between a drive sprocket 15 provided on a drive shaft 14a of the drive motor 14 and the sprocket 13 provided on the rotating shaft 12, and the rotary table 10 rotates by the power of the drive motor 14.

[0011] The cylindrical soil tank 20 is a container for forming a soil specimen 2 (simulated soil) simulating an excavated soil, and can apply a predetermined pressure to the soil specimen 2. The cylindrical soil tank 20 includes a body 21 and a bottom plate 22, and has a bottomed cylindrical shape. The body 21 is formed in a cylindrical shape. The lower end of the body 21 is fixed to the upper surface of the bottom plate 22. The bottom plate 22 has a disk shape. The outer diameter of the bottom plate 22 is larger than the outer diameter of the body 21, and the peripheral portion of the bottom plate 22 protrudes from the lower end of the body 21 in a flange-like shape. The cylindrical soil tank 20 is bolted to the rotary table 10 via the peripheral portion of the bottom plate 22. The upper end of the body 21 is provided with a flange 24 for fixing a lid 70. The cylindrical soil tank 20 is provided with an accelerometer 31, an earth pressure gauge 32, and a strain gauge 33. The accelerometer 31 is provided on the outside of the body 21, and measures the acceleration in the circumferential direction of the body 21, and detects the presence or absence of jamming from the change in acceleration. In other words, when the change in acceleration of the accelerometer 31 becomes large (when vibration occurs), it is determined that jamming has occurred, and when the change in acceleration becomes small (when vibration does not occur), it is determined that jamming has not occurred. The earth pressure gauge 32 is provided on the outside of the body 21 and on the upper surface of the bottom plate 22. The earth pressure gauge 32 on the outside of the body 21 measures the earth pressure of the soil specimen 2 inside through a through hole (not shown) formed in the body 21, and detects the expansion of the soil specimen 2 due to jamming from the measured earth pressure. In other words, when the earth pressure becomes large, it is determined that jamming has occurred. When the earth pressure becomes small, it is determined that the slippery material has acted and jamming has disappeared. The earth pressure gauge 32 on the bottom plate 22 detects the pressure of the ground specimen 2. The strain gauge 33 is provided on the outside of the body 21 and complements the earth pressure gauge 32 on the bottom plate 22 by measuring the strain of the body 21 due to the earth pressure from the ground specimen 2.

[0012] The lid body 70 includes a body 71 and a cover plate 72. The body 71 is formed in a cylindrical shape and has the same diameter as the body 21 of the cylindrical soil tank 20. The cover plate 72 is fixed to the upper end of the body 71. An insertion hole 73 is formed in the center of the cover plate 72, and the insertion part 50 is inserted into the insertion hole 73 so as to be movable in the axial direction and relatively rotatable. A flange 74 for fixing the lid body 70 to the cylindrical soil tank 20 is provided at the lower end of the body 71. The flange 74 has an outer circumferential diameter equal to that of the flange 24, and is overlapped on the flange 24. The flanges 24 and 74 are bolted together to fix the lid body 70 to the upper part of the cylindrical soil tank 20. A bearing device 75 is provided on the cover plate portion 72. The bearing device 75 is a member that supports the penetration portion 50 so that it can move in the axial direction and rotate relatively, and rotates together with the cylindrical soil tank 20. The bearing device 75 is formed in a cylindrical shape, and on its inner circumferential surface, multiple bearing rows 77 are formed, each having multiple bearings 76 arranged in parallel in the axial direction.

[0013] The load body 40 is a member for applying a predetermined pressure to the ground specimen 2, and is placed on the ground specimen 2. The load body 40 has a disk shape, and increases the earth pressure of the ground specimen 2 by pressing down on the ground specimen 2 from above. An insertion hole 41 is formed in the center of the load body 40, and the penetration part 50 is inserted into the insertion hole 41 so as to be movable in the axial direction and relatively rotatable. The load body 40 is disposed inside the lower end of the body 71 and below the cover plate part 72 with a gap. A pressurizing tube 80 is interposed in the gap between the load body 40 and the cover plate part 72 of the cover body 70. The pressurizing tube 80 is formed in an annular shape, and is disposed between the load body 40 and the cover plate part 72 so as to surround the penetration part 50. The pressurizing tube 80 expands by injecting a fluid such as air into the inside. Since the height position of the cover plate portion 72 is fixed, the load body 40 is forced downward as the pressurizing tube 80 expands, and pressure is applied to the ground specimen 2. A cylindrical case 81 is provided inside the pressurizing tube 80. The cylindrical case 81 is a portion that prevents the outer peripheral surface of the penetration portion 50 from being pressed when the pressurizing tube 80 expands. The cylindrical case 81 is a cylindrical member made of a material that is difficult to deform, such as metal, and has an inner diameter larger than the outer diameter of the penetration portion 50. The cylindrical case 81 is disposed at a distance from the outer peripheral surface of the penetration portion 50. The load body 40 is provided with a plurality of through holes (not shown). The through holes are holes for allowing the lubricant injected into the ground specimen 2 to escape to the upper part of the load body 40, and are formed at a predetermined interval in a portion of the load body 40 near the insertion hole 41.

[0014] The penetrating part 50 is a member that penetrates the cover body 70 and the load body 40 and penetrates into the ground specimen 2. The penetrating part 50 has a cylindrical body 51, a pressing force generating part 52, a torque measuring part 53, and a lubricant injecting part 54. The cylinder 51 is a main body that is inserted into the ground specimen 2, and has a cylindrical shape that is open at the top and bottom. As shown in FIG. 2, the lower end surface (tip surface) of the cylinder 51 has a tapered surface 51a that protrudes downward toward the center of the cylinder 51. The lower end surface of the cylinder 51 is formed unevenly along the circumferential direction, assuming a shield cutter of a shield excavator. A cutter portion (not shown) that spreads outward is formed on the outer circumferential surface of the lower end of the cylinder 51, assuming an overcutter. A plurality of cutter portions are formed at predetermined intervals along the circumferential direction. An accelerometer 34 and a strain gauge 35 are provided inside the cylinder 51. The accelerometer 34 measures the acceleration in the circumferential direction of the cylinder 51. The strain gauge 35 complements the earth pressure gauge 32 on the bottom plate portion 22 by measuring the strain of the cylinder 51 due to the earth pressure from the ground specimen 2. When the earth pressure increases, the strain in the circumferential direction of the cylinder 51 increases, which is detected by the strain gauge 35. A pair of arms 55, 55 extending to the left and right are provided at the upper end of the cylindrical body 51. A load cell 36 is provided at the base end of the arm 55 at the top of the cylindrical body 51, and a load cell 37 is provided at the tip of one of the arms 55. A displacement meter 38 is provided at the middle of the arm 55. The load cell 36 is provided below the pressing force generating unit 52 and measures the pressing force of the pressing force generating unit 52. The load cell 36 measures the pressing force by measuring the strain of the strain body that is deformed by the pressing force of the pressing force generating unit 52 with a strain gauge. The load cell 37 is used as a torque measuring unit 53. The torque measuring unit 53 will be described later. The displacement meter 38 measures the amount of penetration (penetration depth) of the penetration unit 50, and detects the presence or absence of jamming and changes in the penetration torque (penetration resistance force) by detecting a sudden change in the amount of penetration. If the amount of penetration suddenly decreases, it is determined that jamming has occurred, and if the amount of penetration suddenly increases, it is determined that the lubricant has acted and exerted its effect.

[0015] The pressing force generating unit 52 is a device that presses the cylindrical body 51 downward so as to penetrate the ground specimen 2. The pressing force generating unit 52 is composed of a compression cylinder that extends downward, and is installed above the cylindrical body 51. The torque measurement unit 53 is a means for measuring the torque value generated when the cylindrical body 51 is inserted into the rotating ground specimen 2. The torque measurement unit 53 is composed of a load cell 37 provided at the tip of an arm 55 on the upper part of the cylindrical body 51. The load cell 37 measures the load acting on the tip of the arm 55 moving within the guide part 39, and calculates the torque value generated when the cylindrical body 51 is inserted into the ground specimen 2, taking into account the length of the arm 55.

[0016] The lubricant injector 54 is a means for injecting lubricant into the ground specimen 2. The lubricant injector 54 includes an injection hole 56 and an injection pipe 57. The injection hole 56 is a through hole formed in the cylinder 51, and the lubricant is injected from the outside of the injection hole 56 toward the ground specimen 2 around the cylinder 51. The injection holes 56 are formed at two locations: a position near the lower end of the cylinder 51, and a height position located above the lower end by a length approximately half the height dimension of the ground specimen 2. The injection pipe 57 connects a lubricant supply device (not shown) to the injection hole 56, and is piped inside the cylinder 51. Two injection pipes 57 are provided, and the downstream ends of each injection pipe 57 are connected to the inside of each injection hole 56. The lubricant pumped from the lubricant supply device is supplied from the injection hole 56 toward the ground specimen 2 through the injection pipe 57. When only the lower injection hole 56 penetrates into the ground specimen 2, the lubricant is supplied only to the lower injection hole 56. As shown in FIG. 2, a soil protection section 58 is formed on the lower side (tip side) of the injection hole 56 located at the lower end (tip) of the cylinder 51. When the penetration section 50 penetrates the ground specimen 2, soil enters the inside of the cylinder 51, but the soil protection section 58 is a member that protects the soil of the ground specimen 2 from the injection hole 56 and the position of the injection pipe 57. The soil protection section 58 has a rectangular parallelepiped shape and has a width dimension larger than the outer diameter dimension of the injection pipe 57. The soil protection section 58 is disposed below the lower end of the injection pipe 57 so that the lower end of the injection pipe 57 is hidden when viewed from directly below. The shape of the soil protection section 58 is not limited to a rectangular parallelepiped, and the lower surface may be inclined. With such a configuration, soil is easily moved from the projection position of the injection pipe 57.

[0017] When performing a test using the penetration resistance measuring device 1 of this embodiment, as shown in FIG. 3, the cylindrical soil tank 20 is filled with soil having a composition similar to that of the excavated soil to form a ground specimen 2. Next, the load body 40 is placed on the ground specimen 2, and the pressurizing tube 80, the cover body 70, etc. are installed, and further, the penetration part 50 is installed at a predetermined height (a height at which the lower end of the cylindrical body 51 of the penetration part 50 is on the upper surface of the ground specimen 2). The pressurizing tube 80 is expanded to press the load body 40 against the ground specimen 2, and a desired earth pressure is achieved. By providing the pressurizing tube 80 in this way, the pressure force with which the load body presses the ground specimen 2 can be easily adjusted. Since the cylindrical case 81 is provided inside the pressurizing tube 80, the pressurizing tube 80 does not press the cylindrical body 51. Therefore, no frictional force is generated between the pressurizing tube 80 and the cylindrical body 51, and the rotation of the cylindrical soil tank 20 is not hindered. The earth pressure of the ground specimen 2 is measured by an earth pressure gauge 32 installed on the upper surface of the bottom plate portion 22. Furthermore, the earth pressure is supplemented by a strain gauge 35 inside the cylinder 51, so that an accurate value can be obtained.

[0018] Then, while rotating the rotary table 10 to rotate the cylindrical soil tank 20 and the ground specimen 2, the compression cylinder of the pushing force generating unit 52 is extended to cause the cylindrical body 51 of the penetration unit 50 to penetrate the ground specimen 2. This simulates the state in which the cutter of the shield machine excavates the excavated ground while rotating. At this time, the penetration of the cylindrical body 51 causes soil to flow into the inside of the cylindrical body 51, but since the soil guard unit 58 is formed at the downstream end of the injection pipe connected to the injection hole 56, it is possible to suppress wear of the injection hole 56 and the injection pipe 57 by the soil. In addition, since the tip surface of the cylinder 51 has a tapered shape that protrudes downward toward the center of the cylinder 51, as the penetration of the cylinder 51 progresses, the soil moves toward the outer periphery of the cylinder 51, so that the soil becomes dense on the outer periphery of the cylinder 51 and the soil pressure on the outer periphery increases. This makes it easier to simulate jamming. The occurrence of jamming is detected from the measurement results of the accelerometer 31 mounted on the outside of the body 21. The occurrence of jamming is also detected when the earth pressure gauge 32 on the outside of the body 21 detects the expansion of the ground specimen 2 due to jamming. Furthermore, the accelerometer 34 inside the cylinder 51 measures the acceleration in the circumferential direction of the cylinder 51, and detects the presence or absence of jamming based on the presence or absence of an antiphase with the measurement results of the accelerometer 31. The displacement meter 38 in the middle of the arm 55 detects the presence or absence of jamming by detecting a sudden decrease in the amount of penetration. As described above, various sensors detect the occurrence of jamming, so that it is possible to know the occurrence of jamming reliably.

[0019] When jamming occurs, a lubricant is injected from the lubricant injection section 54 toward the ground specimen 2. In this embodiment, since the penetrating section 50 moves downward without rotating, the lubricant injection section 54 connected to a lubricant supply device can be formed in the penetrating section 50. This allows a large amount of lubricant to be injected stepwise into the ground specimen 2 while the penetrating section 50 is in the penetrated state. The lubricant injection section 54 is provided with an injection hole 56 and an injection pipe 57, so that the lubricant can be injected from a desired position on the outer circumferential surface of the cylinder 51 (the position where the injection hole 56 is formed). Furthermore, various measuring instruments can be installed inside the cylinder 51. The torque measurement unit 53 measures the torque value generated when the cylinder 51 penetrates the rotating ground specimen 2, so it is possible to confirm how much the torque value has been reduced by the slipper. Therefore, the effect of the slipper can be quantitatively understood. In other words, the friction force between the shield machine peripheral surface and the excavated soil can be simulated. In addition, when jamming occurs, the penetration part 50 is restrained and becomes difficult to move downward (the penetration speed decreases), but when jamming is eliminated by the effect of the slipper, it becomes easier to move downward. Therefore, the effect of the slipper can be detected by measuring the penetration amount (penetration depth) of the penetration part 50 with the displacement meter 38 provided on the arm 55. Furthermore, the effect of the slipper can be detected by the accelerometer 31 and the earth pressure meter 32.

[0020] Since the load body 40 has a plurality of through holes, the slipper injected into the ground specimen 2 can escape to the upper part of the load body 40. This prevents the slipper from accumulating too much, and allows measurements to be performed that are similar to those of actual excavation. In addition, a cutter section that spreads outward is formed at the tip of the cylinder 51, so that an overcutter can be simulated. Furthermore, a bearing device 75 that rotates together with the cylindrical soil tank 20 and supports the cylinder 51 so that it can rotate and rise and fall relative to the cylindrical soil tank 20 is provided at the top of the lid 70, so that the non-rotating cylinder 51 can be inserted into the ground specimen 2 that rotates together with the cylindrical soil tank 20.

[0021] Although the embodiment for carrying out the present invention has been described above, the present invention is not limited to the above embodiment, and appropriate design changes are possible within the scope of the present invention. For example, in the above embodiment, the soil protection portion 58 is a rectangular parallelepiped, but the shape is not limited to this. The bottom surface of the soil protection portion 58 may be inclined from the horizontal. With such a configuration, soil and sand can easily move from the projection position of the injection pipe 57 along the slope. [Explanation of symbols]

[0022] 1. Penetration resistance measuring device 2 Ground specimen (simulated ground) 10 Rotating table 20 Cylindrical soil tank 21 Torso 22 Bottom plate part 40 Loading object 50 Penetration 51 Cylinder 52 Push-in force generating section 53 Torque measurement section 54 Lubricant injection part 56 Injection hole 57 Injection tube 58 Soil protection section 70 Lid 71 Torso 72 Lid plate part 75 Bearing device 80 Pressure Tube 81 Cylindrical Case

Claims

1. The apparatus comprises a rotary table, a cylindrical soil tank fixed to the rotary table, a load placed on a simulated ground provided in the cylindrical soil tank, and a penetration part penetrating the load into the simulated ground, The penetration unit includes a cylinder, a pushing force generating unit provided on the upper part of the cylinder, a torque measuring unit that measures a torque value generated when the cylinder is penetrated into the simulated ground rotating together with the rotary table, and a lubricant injecting unit that injects a lubricant into the simulated ground. A device for measuring penetration resistance.

2. The tip surface of the cylindrical body has a tapered shape that protrudes downward toward the center of the cylindrical body.

2. The device for measuring penetration resistance force according to claim 1 .

3. The lubricant injection section includes an injection hole formed on the side surface of the cylindrical body and an injection pipe connected to the injection hole.

3. The device for measuring a penetration resistance force according to claim 1 or 2.

4. A soil avoidance section is formed inside the cylinder, closer to the tip of the cylinder than the injection hole located at the tip of the cylinder, to avoid soil of the simulated ground from the position of the injection hole and the injection pipe.

4. The device for measuring penetration resistance force according to claim 3.

5. A lid is provided at the upper end of the cylindrical soil tank, A pressure tube is interposed between the load body and the lid body. The device for measuring a penetration resistance force according to any one of claims 1 to 4.

6. The load body is provided with a plurality of through holes. The device for measuring a penetration resistance force according to any one of claims 1 to 5.

7. A plurality of cutters extending outward from the outer surface are formed at the tip of the cylindrical body, and the plurality of cutters are arranged at predetermined intervals along the circumferential direction of the cylindrical body. The device for measuring a penetration resistance force according to any one of claims 1 to 6.

8. A bearing device is provided at the upper end of the cylindrical soil tank, which rotates together with the cylindrical soil tank and supports the cylindrical body so that it can rotate and rise and fall relative to the cylindrical soil tank. The device for measuring a penetration resistance force according to any one of claims 1 to 7.

9. The pressurizing tube is formed in a circular ring shape, A cylindrical case is provided inside the pressurizing tube to surround the cylindrical body. The device for measuring a penetration resistance force according to claim 5.

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