JP6473913B2 - Automatic simple dynamic cone penetration tester - Google Patents

Description

  The present invention relates to a technology of a geological surveying machine, and more specifically, after a driving roller that is rotated by a motor is pressed against a striking device by a pressing mechanism, the striking device is raised to a predetermined height, and then the striking device is separated by a release mechanism. This is a series of operations in which the penetrating rod is hit freely and the penetrating rod is hit, and the penetrating amount per hit of the penetrating rod is electrically measured and recorded. The present invention relates to a technology of an automatic simple dynamic cone penetration testing machine that enables high accuracy and shortening of working time.

  In recent ground surveys, a simple penetration test method using a "Satken-type simple penetration tester" or a "small penetration tester" that can obtain engineering evaluation has been used. The simple penetration test method is a method in which a hammer of 5.00 ± 0.05 kg is freely dropped from a height of 500 ± 10 mm, and the number of times required for the tip cone to penetrate 100 mm, that is, the N value is measured. Such a testing machine can be operated even by a small number of workers of about two people, and has a feature that it is simple and economical.

  In a simple penetration tester, etc., the energy required for penetrating the cone is given by the hammer's potential energy, so that the hammer is lifted up by a relative distance of 500 mm and dropped freely, and the amount of cone penetration by striking is measured. Since it may be necessary to carry out these operations simultaneously and repeatedly, a method in which all of these are performed manually is likely to cause a mistake in counting the number of hits and an error in entering the penetration amount. In addition, since it is necessary to lift a hammer weighing 5 kg several hundred to several thousand times in one geological survey, the labor burden on the worker is large, so considerable rest time is required to recover from fatigue. There was a problem that it was necessary and work efficiency was poor. In addition, with a structure that supports the rod by hand, it is easy to cause an occupational accident where the hand and fingers are pinched between the hammer and the knocking head. Therefore, it is necessary to eliminate this danger and ensure safety. .

  Conventionally, various techniques have been proposed to solve such problems. For example, an electric “automatic simple dynamic cone penetration tester” (Patent Document 1) has been proposed. The automatic simple dynamic cone penetration tester is commercialized under the trade name of “Super Kando-kun”, and a drive part composed of a drive motor is provided on the ceiling, and an operation part composed of a striking device is provided. The means to raise is taken. However, the automatic simple dynamic cone penetration tester always has frictional resistance and contact wear between the driving part and the working part because the driving part is always in contact with the working part. For example, it is not possible to accurately obtain the penetration amount based on the premise of the free fall in the contactless state of the operating part, and it takes time to operate the device that electrically controls the driving part that switches the lifting movement. is there. In other words, it is impossible to improve the efficiency of the working part that is hit and lowered hundreds of times in one geological survey.

  In addition, as another electrification, the hammer is lifted with the engagement piece of the chain that is rotated endlessly by the drive motor to the tester body, released upward, and the hammer is dropped. There is a “DOKEN automatic penetration tester” that counts the number of shots with a counter and displays the integrated value (Patent Document 2). Certainly, since a tripod is not used, it has the merit that it can be easily tested even in a small place. However, the Doken automatic penetration tester does not satisfy the test conditions described in the above section 0002 because the tester body and the penetration bar are integrated, and the load of the tester body also acts on the penetration bar. There was a problem.

  Further, a case main body capable of detachably connecting a connectable rod to a lower end portion in a vertical posture, a striking position for indirectly hitting a rod in a vertical posture connected to the lower end portion of the case main body, and this position "Penetration testing machine" with a hammer that can take a fall start position that is spaced apart from the top by a certain distance, and a hammer lifting mechanism that lifts the hammer at the strike position to the drop start position and allows the hammer to fall freely at this position There is also (patent document 3). However, the penetration testing machine does not employ a mechanism for directly hitting a knocking block joined directly to the penetration rod with a hammer, and has a problem that the test conditions described in the paragraph 0002 are not satisfied.

  Therefore, the present inventor operates the striking device in a state separated from the penetrating rod, transmits the striking load of only the hammer to the penetrating rod, and automatically repeats the rising and falling of the striking device continuously. In order to solve the problem of what kind of mechanism should be adopted to make it possible, a mechanism for pressing the rotating driving roller against the striking device and raising the striking device by the pressing and then releasing it is released. With the idea that these problems could be solved if equipped, we developed a device that embodies such an operation, and led to the completion of the "automatic simple dynamic cone penetration tester" according to the present invention. is there.

Utility Model Registration No. 3115488 Japanese Patent Application Laid-Open No. 7-117333 Japanese Patent Laid-Open No. 10-077626

  In view of the above problems, the present invention improves the measurement accuracy in ground survey using a geological survey machine, automation of measurement, safety of workers, shortening of work time, and electric type that can be installed on soft or sloping land It is an object of the present invention to provide an automatic simple dynamic cone penetration tester.

  In order to achieve the above object, the present invention is a simple dynamic cone penetration tester, a main body case, a penetration rod, a striking device for striking the penetrating rod, a lifting device for raising the striking device, Drive device for driving the ascending device, control device for controlling the drive device, measurement recording device for measuring and recording the count signal for each hit by the hitting device and the penetration amount of the penetrating rod, and the main body case , And a penetrating member that adjusts the height and level of the penetrating rod, and the penetrating rod includes a penetrating cone connected to the tip and a knocking head and a guide rod connected to the trailing end, respectively. The lifting device is composed of a plurality of guide rollers, a driving roller, a passive roller, and a driving roller detachment mechanism. The device is a device that generates power for rotating the drive roller, and the control device includes rotational power control and a power supply circuit of the drive device, and the drive roller is continuously rotated by the drive device. In addition, the impact material is raised by pressing an elastic material provided around or wound around the outer peripheral edge and the concave groove portion against the guide pipe by a driving roller side pressing mechanism, and the passive roller is pressed by the driving roller. The guide pipe is clamped and rotated in order to raise the striking device in response to the rotation, the plurality of guide rollers guide the lifting operation so that the striking device rises and falls vertically, and the drive roller detachment mechanism is The driving roller and the guide pipe are separated from the contact state by being brought into a non-contact state, and the striking device There has a structure of dropping by its own weight, by the rotation of the drive roller repeats a contact state and a non-contact state to the percussion device, it adopts the configuration to continuously rise and fall the percussion device.

  Further, according to the present invention, the drive roller detachment mechanism is separated by changing the contact state between the drive roller and the guide pipe from the contact state between the drive roller and the guide pipe by a cam mechanism provided with a protrusion on the drive roller. It is also possible to adopt a configuration that is a mechanism for dropping by its own weight.

  According to the present invention, the drive roller separation mechanism includes a rotational displacement measuring device that detects the rotational speed of the driving roller, and an electromagnetic solenoid in the driving roller side pressing mechanism, and the rotational displacement obtained from the rotational displacement measuring device. Adopting a structure that is driven by electronically controlling the electromagnetic solenoid based on the information, disengaging it from the contact state between the drive roller and the guide pipe and removing it by its own weight. You can also.

  According to the automatic simple dynamic cone penetration tester according to the present invention, since the conventional hammer driving has been automated by a controlled motor drive, accurate lifting and raising height control and significant There is an excellent effect that the labor burden can be reduced.

  According to the automatic simple dynamic cone penetration testing machine according to the present invention, the penetration amount of the penetration rod and the number of hits per unit penetration amount are automatically recorded and calculated by an electric signal, so that an accurate and quick test can be performed. There is an excellent effect that it can be implemented.

  According to the automatic simple dynamic cone penetration tester according to the present invention, the work related to the measurement can be performed almost automatically, so that it is possible to avoid occupational accidents such as hitting a hand with a hitting member as in the past. There is an advantageous effect that it becomes possible.

  According to the automatic simple dynamic cone penetration tester according to the present invention, the compact tripod specification provides an excellent effect that the height of the stance and the horizontal adjustment can be easily performed even in a narrow area or an inclined area.

It is a whole schematic diagram showing the whole composition of the automatic simple dynamic cone penetration testing machine concerning the present invention. It is an expansion explanatory view for explaining each mechanism of the automatic simple dynamic cone penetration testing machine concerning the present invention. It is explanatory drawing which shows the installation assembly work state of the automatic simple dynamic cone penetration testing machine which concerns on this invention. It is explanatory drawing which shows the initial setting state of the automatic simple dynamic cone penetration testing machine which concerns on this invention. It is explanatory drawing which shows the control mechanism of the automatic simple dynamic cone penetration testing machine which concerns on this invention, and is an explanatory view at the time of a drive roller and a guide pipe becoming a contact state and a guide pipe going up. It is explanatory drawing which shows the control mechanism of the automatic simple dynamic cone penetration testing machine which concerns on this invention, and is explanatory drawing at the time of a guide pipe separating from a drive roller and falling freely. It is explanatory drawing which shows embodiment at the time of using an electronic control mechanism for the drive roller detachment | desorption mechanism based on this invention.

  In the present invention, a rotating driving roller 42 is brought into contact with a guide pipe 31 that is a constituent member of the striking device 30 in a pressed state, and the striking device 30 is accurately lifted and lifted to a predetermined height. Thus, the driving roller 42 and the guide pipe 31 that have been in contact with each other are brought into a non-contact state, so that the impacting device 30 is freely dropped and the penetrating rod 20 is hit. The greatest feature is that a configuration for electrically storing and calculating the signal and penetration amount for each impact is adopted. DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  2 and FIGS. 4 to 7, the upper part of each drawing shows the state of the inside of the main body case 10 as viewed from above. This is a reference for facilitating understanding of the operation of the lifting device 40. It is a figure, the operation | movement relationship of the drive roller 42, the passive roller 45, and the drive roller detachment mechanism 46 is shown, and description is abbreviate | omitted about the guide roller 41 and other structures. In addition, this invention is not limited to the dimension and shape described as description of the following drawings, It can change within the range which has substantial value as creation of the technical idea of this invention.

  FIG. 1 is an overall schematic diagram showing the overall configuration of an automatic simple dynamic cone penetration tester 1 according to the present invention, and FIG. 2 explains each mechanism of the automatic simple dynamic cone penetration tester 1 according to the present invention. It is an enlarged explanatory view for doing. The automatic simple dynamic cone penetration testing machine 1 according to the present invention includes a main body case 10, a penetration rod 20, a striking device 30 that strikes the penetrating rod 20, a lifting device 40 that lifts the striking device 30, and the lift. A driving device 50 for driving the device 40, a control device 60 for controlling the driving device 50, a measurement recording device 62 for measuring and recording the rising and falling states of the striking device 30, and the main body case 10 as a stand. It is comprised from the stance member 80 which adjusts the height and level.

  Fig.1 (a) shows the installation state in flat ground. The automatic simple dynamic cone penetration testing machine 1 according to the present invention can be used for simple support force determination of the surface ground on a flat ground by adjusting the leg length of the standing member 80.

  FIG.1 (b) shows the installation state in a sloping ground. The automatic simple dynamic cone penetration testing machine 1 according to the present invention is a simple method for surface layer ground on sloped land such as embankment, cutting, slope, narrow land, and soft ground by adjusting the length of the leg of the standing member 80. It can be used for the determination of the supporting force.

  The main body case 10 is formed by using a high-strength material such as metal to form a rectangular parallelepiped box-shaped container. The main body case 10 includes a rising device 40 inside, a driving device 50 mounted on a side surface, and a stand on the lower surface. The member 80 is mounted and configured. In the drawing, the drive device 50 is shown as being provided on the outer wall surface of the container. However, the present invention is not limited to this, and the drive device 50 may be provided internally. FIG. 2 is an illustration of a case where a mechanical element mechanism using a cam mechanism 46a is employed as means for raising and dropping the impacting device 30, and the driving roller 42 is guided to the guide pipe 31 by the initial setting state or the cam mechanism 46a. This shows a state in which is removed from the sandwiched state.

  The penetrating rod 20 is a plurality of steel rods with an outer diameter of 16 ± 0.2 mm and a length of 500 mm as a standard on which a penetrating cone 21 made of steel with a tip angle of 60 ° and a bottom area of 4.9 cm 2 is mounted. The upper end portion is formed with a connecting portion for connecting with a tip portion of the knocking head 35 or a tip portion of a steel rod continuously added as the penetration amount increases by screwing or the like.

  The striking device 30 is a device that repeatedly ascends and falls by the ascending device 40 and the drive roller detaching mechanism 46, and strikes the knocking head 35 from a height of a specific height of 500 mm, and includes a hammer 32 and a guide pipe 31. . The guide pipe 31 has a guide through hole 31b for guiding the guide rod 33, and the outer peripheral surface is a contact surface with the driving roller 42, the guide roller 41, and the like. Further, in a predetermined area surface, the penetrating amount measuring portion 31a is brought into contact with a rubber roller or the like attached to the rotary encoder 70 by the rotary encoder side pressing mechanism 44. A hammer 32 is detachably attached to the tip of the guide pipe 31 by screwing or the like. The total mass of the hammer 32 and the guide pipe 31 is configured to be 5.00 ± 0.05 kg. Since the guide pipe 31 is a hollow pipe that is constantly pressed in the direction perpendicular to the axial direction by the pressing mechanism 44, it is desirable to use a material that is strong against bending stress and the like.

  The lifting device 40 includes a guide roller 41, a driving roller 42, a passive roller 45, and a driving roller detaching mechanism 46. The guide roller 41 rotatably supports the guide pipe 31 of the striking device 30 in a contact state at all times, and the passive roller 45 sandwiches the guide pipe 31 by receiving pressure from the driving roller 42, and the operation of the guide pipe 31 Rotate with.

  The driving roller 42 is a member that transmits the rotational power from the driving device 50 to the striking device 30, and presses a substantially semicircular concave groove formed on the outer peripheral edge portion against the guide pipe 31 to raise the striking device 30. An elastic material 43 having a large frictional resistance coefficient and shock-absorbing characteristics is provided around or wound around the outer circumferential edge of the drive roller 42 and the concave groove.

  The circumferential length of the drive roller 42 needs to be at least 500 mm or more, and when a mechanical element mechanism such as the cam mechanism 46a as shown in FIGS. In addition to securing a rising distance of 500 mm by continuous clamping, it is necessary to add a circumferential length and size for ensuring a non-contact state until the hammer 32 freely falls and hits the penetrating cone 21. However, a specific example in which a mechanical element mechanism is adopted as the driving roller detachment mechanism 46 is not limited to the cam mechanism 46a. For example, a configuration in which a small diameter region is provided so that a part of the outer periphery of the driving roller 42 is not in contact with the driving roller separation mechanism 46. But you can.

  On the other hand, when adopting a configuration using an electronic control mechanism to raise and drop the striking device 30, the outer periphery of the drive roller 42 may be small unlike the configuration described above. In the case of adopting such a configuration, it is possible to respond regardless of the number of rotations by calculating the ascent distance from the circumferential length and the rotation angle. In other words, although not shown in the figure, a signal from the sensor and rotation angle information input from the rotary encoder 70 pressed by the rotary encoder side pressing mechanism 44 are calculated and replaced with an ascending distance.

  Next, the configuration in the case where the cam mechanism 46a is used as a means for raising and dropping the impacting device 30 will be described with reference to FIGS. A cam mechanism 46 a is provided on the circumference of the drive roller 42, the drive roller 42 is pushed up by bringing the drive roller 42 into contact with the guide pipe 31 by the drive roller side pressing mechanism 43, and is released by the cam mechanism 46 a, so that the guide pipe 31 is freely dropped. At this time, the cam mechanism 46 a is not in contact with the guide pipe 31. The outer diameter of the drive roller 42 is determined by a value obtained by adding the edge length of the cam mechanism 46a and the lifting height of the guide pipe 31 of 500 ± 10 mm. Note that the separation time by the cam mechanism 46a at this time is determined by the circumferential length of the edge of the cam mechanism 46a and the rotation speed, and therefore the rotation speed of the driving device 50 according to the ground state and the fall state of the guide pipe 31. Adjust.

  Unlike the mechanical element mechanism by the cam mechanism 46a, when an electronic control mechanism that controls the electromagnetic solenoid 91 as a means for raising and dropping the impacting device 30 is employed, as shown in FIG. In order to grasp the rotational state of 42, information such as the rotational displacement amount and position of the driving roller 42 is obtained using the rotational displacement measuring device 90 in the same manner as the rotary encoder 70, and these signals are calculated and the result is output. To do. One file is selected from the setting file list stored in the measurement recording device 62 according to the conditions, and the rotational speed of the driving roller 42 and the on / off operation timing of the electromagnetic solenoid 91 are controlled. Note that the rotational displacement measuring device 90 may be a simple device such as optically obtaining positional information and velocity information by providing slits and projections at equal intervals on the circumference of the driving roller 42, and is controlled more accurately. It is also effective to measure the amount of displacement with a rotary encoder 70 if there is any. Further, the simplest control in which a limit switch 71 is provided to control the electromagnetic solenoid 91 by a mechanical on / off signal, the rotational displacement is detected by using the rotary encoder 70, and the onboard microcomputer or the like is controlled from the signal. It is conceivable that this is due to sequence control.

  The driving device 50 is a device that generates power for rotating the driving roller 42, and the motor to be used is not particularly limited to either AC or DC, and for example, AC 100V, output 60W, rated current 1.1A. Using a motor with a rotation speed of 1600 rpm and a reduction gear head with a gear ratio of 60: 1, it is mounted on the side surface of the main body case 10 and directly connected to the rotation shaft of the drive roller 42.

  The control device 60 includes a motor control unit of the driving device 50, a power supply circuit, and the like. These control means and the like are not particularly limited in the same manner as the type of the motor. For example, if the motor used in the driving device 50 is an AC 100V specification, the voltage proportional to the frequency is changed by inverter control. VVVF control (Variable Voltage Variable Frequency) that performs rotation control and PWM control (Pulse Width Modulation) that is controlled by pulse width modulation when using a 12V DC motor is selected as appropriate according to the motor used. Control this.

  FIG. 7 is an explanatory diagram of the configuration when the automatic simple dynamic cone penetration testing machine 1 according to the present invention adopts a configuration that operates by electronically controlling the electromagnetic solenoid 91 to raise and drop the impact device 30. . Although not shown in order to electronically control the ascent and detachment of the striking device 30, for raising and dropping the striking device 30 using a rotary encoder, an optical sensor, a limit switch 71 or the like. It is necessary to command the timing. Specifically, the driving roller 42 is pressed against the guide pipe 31 by the electromagnetic solenoid 91, the impact device 30 is raised to a predetermined height (500 mm), and then the pressure is released by the electromagnetic solenoid 91 to raise the impact. The device 30 is dropped from a predetermined height (500 mm).

  As illustrated in FIGS. 2 and 4 to 7, the rotary encoder 70 is attached to one end of an encoder bracket 44 b attached to a part of the main body case 10, and measures the rotation of the passive roller 45 to measure the passive roller 45. A configuration may be obtained by calculation from the circumferential length of 45 and the rotation angle, or a configuration in which the angular velocity and displacement of the drive roller 42 are directly measured by the rotary encoder 70 as shown in FIG. In the configuration using the encoder bracket 44b, the rubber roller edge attached to the measuring shaft is constantly pressed against the penetration amount measuring portion 31a of the guide pipe 31 by an elastic member such as a tension spring or a compression spring 44a, and the penetration rod 20 is underground. The amount of penetration into is measured. The pressing method shown in each figure is a simple example of a state in which the rubber roller edge attached to the measurement shaft of the rotary encoder 70 is pressed against the guide pipe 31 by the compression spring 44a via the encoder bracket 44b. is there. However, the present invention is not limited to such a configuration, and the configuration of whether the rotary encoder 70 is operated accurately or not is not particularly limited. In order to give an appropriate pressure, the space in the main body case 10 is taken into consideration, and the steel material, coil diameter, number of turns, spring constant, spring length, how to take the reaction force on the main body case 10, etc. are determined. For the penetration amount measurement, it is also effective to use a non-contact type distance measuring device using a magnetic type or a laser beam in addition to the aspect in which the rotary encoder 70 is used in a contact state.

  The limit switch 71 is attached to a part of the main body case 10, protrudes from the periphery of the rotation shaft of the drive roller 42, detects the detection protrusion 48 that passes through the rotation of the drive roller 42, and performs each hit by the impact device 30. This timing signal is output.

  The measurement recording device 62 is an automatic simple dynamic cone penetration tester according to the present invention, such as the penetration amount from the rotary encoder 70, the timing signal for each impact from the limit switch 71, or the rotational displacement measuring instrument 90 and the electromagnetic solenoid 91. 1 is used to input / store / calculate / output all the electrical signals in FIG. 1, and may be a dedicated device using a general data logger or the like, or having a memory mounted on an on-board microcomputer. Regardless of which configuration is adopted, the electronic information processed in the measurement recording device 62 can be transmitted to a PC (Personal Computer) via a USB (Universal Serial Bus) or the like. . It is also effective to provide the control panel 61 with a display function for a liquid crystal panel and a printing function so that numerical values and the like can be confirmed at the measurement site. In the drawing, the measurement recording device 62 is shown as being disposed in the control panel 61. However, the measurement recording device 62 may be inside or outside the main body case 10, for example, only by storing data, AD conversion or calculation. Etc. may be performed by an information processing terminal such as a PC.

  The control panel 61 is provided with a display for operating the control device 60 and the measurement recording device 62, a switch, a volume, a terminal connection unit to a PC, and the like.

  The standing leg member 80 is composed of a tripod of three rods that are attached to the lower surface of the main body case 10 and can adjust the leg angle and length. By having the leg portion having such a configuration, the main body case 10 can be leveled even on an inclined ground as shown in FIG. Although not shown, it is desirable to provide a fine adjustment function for leveling more accurately.

  FIG. 3 is an explanatory view showing an installation / assembly operation state of the automatic simple dynamic cone penetration tester 1 according to the present invention. The guide pipe 31 is inserted from above or below the main body case 10 through the plurality of guide rollers 41, the passive rollers 45, and the driving rollers 42, and a hammer 32 is attached to the tip of the guide pipe 31 by screwing or the like. The device 30 is placed on the survey point. Then, the guide rod 33 is inserted into the guide through hole 31b from below, the knocking head 35 is attached by screwing or the like, and the penetrating rod 20 equipped with the penetrating cone 21 is connected to the knocking head 35 by screwing or the like. The three legs of the standing member 80 are adjusted to confirm that the main body case 10 is horizontal and placed at the test position on the ground surface G. Hereinafter, the operation state will be described separately from the case where the cam mechanism 46a and the electromagnetic solenoid 91 are controlled as the means for raising and dropping the impacting device 30.

  4 to 6 are explanatory views showing an operating state when the cam mechanism 46a is used as a means for raising and dropping the impacting device 30, FIG. 4 shows an initial setting state, and FIG. 6 shows a state where the cam mechanism 46a and the passive roller 45 are not in contact with each other during rotation, and FIG. 6 shows a state where the cam mechanism 46a and the passive roller 45 are in contact with each other while the drive roller 42 is rotating. .

  FIG. 4 is an explanatory diagram showing an initial setting state when the cam mechanism 46 a is used in the configuration of the drive roller detachment mechanism 46. The penetrating rod 20 fitted with the penetrating cone 21 is aligned with the survey point position on the ground surface G, and the striking device 30 into which the guide rod 33 is inserted includes a cam mechanism 46a and a passive roller 45 provided on the driving roller 42 of the lifting device 40. The contacted state (the drive roller 42 and the guide pipe 31 are in a non-contact state) is checked to see if the penetrating rod 20 naturally falls into the ground. If you want to penetrate, wait until it stops and measure the amount of penetration when it stops. This value is recorded as an initial value of the penetration amount with a load of 49 N (5 kgf).

  FIG. 5 is an explanatory view showing an operating mechanism of the lifting device 40 (the cam mechanism 46a and the passive roller 45 are in a non-contact state) when the cam mechanism 46a is used as a means for lifting and dropping the impacting device 30. When the driving device (variable speed motor) 50 is driven from the initial setting state and the driving roller 42 rotates to a position where the cam mechanism 46a and the passive roller 45 are in a non-contact state, the compression spring 43a of the driving roller side pressing mechanism 43 The driving roller 42 is pressed against the guide pipe 31 through the driving roller support bracket 47 that supports the driving roller 42. Then, the guide pipe 31 is sandwiched between the two rollers by the pressure generated between the passive roller 45 and the drive roller 42, and the drive roller 42 further rotates, so that the impact device 30 is moved from the lower side to the upper side by a predetermined height. Lift up to (500 ± 10mm).

  FIG. 6 is an explanatory view showing the operating state of the striking device (the cam mechanism 46a and the passive roller 45 are in contact) when the cam mechanism 46a is used as a means for raising and dropping the striking device 30. When the cam mechanism 46a comes into contact with the passive roller 45 again, the driving roller support bracket 47 supporting the driving roller 42 pushes back the compression spring 43a of the driving roller side pressing mechanism 43, and the passive roller 45 and the driving roller 42 are not in contact with each other. The contact state is established, the clamping state of the guide pipe 31 is released, and the striking device 30 naturally falls from a predetermined height (500 ± 10 mm) to a position where it collides with the knocking head 35 along the guide rod 33. The lowering distance of the guide pipe 31 at that time is used as the penetration amount of the penetration rod 20 and measured by the rotary encoder 70 from the penetration amount measuring portion 31a, and the rotation of the driving roller 42 is detected by the limit switch 71, Each timing signal is counted. When the distance between the hammer 32 and the ground surface G is about 100 mm to 200 mm, the measurement operation is temporarily stopped, and it is confirmed that the guide pipe 31 and the driving roller 42 are in contact with each other as shown in FIG. Is stopped and the penetrating rod 20 is added. Next, the striking device 30 is set at a predetermined position, and the measurement operation is resumed. The above steps are repeated, and the cumulative penetration amount and the total number of strikes are recorded from the number of strikes by the strike device 30 and the penetration amount of the penetration rod 20 for each strike.

  The removal operation returns the cam mechanism 46a to a position where it is in contact with the passive roller 45, pushes back the compression spring 43a of the driving roller side pressing mechanism 43 by the driving roller support bracket 47, and presses the passive roller 45 and the driving roller 42 together. The guide pipe 31 is released from the clamping state, and the penetration cone 21, the penetration rod 20, the knocking head 35 and the guide rod 33, and the guide pipe 31 and the hammer 32 are separated from the joint portions by screwing or the like. Carry it out and store it in a storage bag.

  Next, the automatic simple dynamic cone penetration testing machine 1 that employs an electronic control mechanism using an electromagnetic solenoid 91 for raising and dropping the impacting device 30 will be described. FIG. 7 is an explanatory view showing such an embodiment. As shown in FIG. 7, a rotational displacement measuring device 90 that detects the rotational speed and the amount of displacement of the drive roller 42 and an electromagnetic solenoid 91 as the pressing mechanism 44 are provided, and rotational displacement information obtained from the rotational displacement measuring device 90 is included in the rotational displacement information. Based on this, the electromagnetic solenoid 91 is electronically controlled and driven, and the drive roller 42 is brought into contact with the guide pipe 31 which is a constituent member of the striking device 30 and is raised to a predetermined height (500 ± 10 mm). A configuration is adopted in which the driving roller 42 and the guide pipe 31 are separated from each other by the roller detaching device 46 so that the driving roller 42 and the guide pipe 31 are separated from each other and dropped by the weight of the striking device 30. If a general rotary encoder is used for the rotational displacement measuring device 90, manufacture and control are also easy. Although not shown until the operating state, the contact or non-contact state between the driving roller 42 and the guide pipe 31 is not driven by the cam mechanism but the electromagnetic solenoid 91 is driven by electronic control, so that the operating sound of the cam mechanism is generated. Excellent quietness. In addition, in such a configuration, in order to raise the striking device 30 to a predetermined height (500 ± 10 mm), there is an advantage that the outer periphery of the driving roller 42 does not need to be 500 mm or more and can be miniaturized.

DESCRIPTION OF SYMBOLS 1 Automatic simple dynamic cone penetration test machine 10 Main body case 20 Penetration rod 21 Penetration cone 30 Impact device 31 Guide pipe 31a Penetration amount measure part 31b Guide through hole 32 Hammer 33 Guide rod 35 Knocking head 40 Lifting device 41 Guide roller 42 Driving roller 43 Driving roller side pressing mechanism 43a Compression spring 44 Rotary encoder side pressing mechanism 44a Compression spring 44b Encoder bracket 45 Passive roller 46 Driving roller release mechanism 46a Cam mechanism 47 Driving roller support bracket 48 Detection protrusion 50 Driving device 60 Control device 61 Control panel 62 Measurement recording device 70 Rotary encoder 71 Limit switch 80 Standing member 90 Rotational displacement measuring instrument 91 Electromagnetic solenoid G Ground surface

Claims (3)

A simple dynamic cone penetration tester,
A body case,
A penetrating rod,
A striking device for striking the penetrating rod;
A lifting device for lifting the striking device;
A driving device for driving the lifting device;
A control device for controlling the driving device;
A measurement recording device for measuring and recording a count signal for each hit by the hitting device and an amount of penetration of the penetrating rod;
Standing up the main body case, and a standing member for adjusting the height and level,
Consisting of
The penetrating rod comprises a penetrating cone at the front end and a knocking head and a guide rod connected to the rear end, respectively.
The striking device is composed of a guide pipe and a hammer,
The lifting device is composed of a plurality of guide rollers, a driving roller, a passive roller, and a driving roller detachment mechanism,
The drive device is a device that generates power for rotating the drive roller,
Wherein the control device includes a rotation force control unit and power supply circuits of the driving device,
The driving roller is continuously rotated by the driving device, and an elastic material provided around or wound around the outer peripheral edge portion and the concave groove portion is pressed against the guide pipe by the driving roller side pressing mechanism to raise the hitting device. Let
The passive roller rotates while sandwiching the guide pipe in order to raise the striking device in response to pressure from the driving roller,
The plurality of guide rollers guide the lifting operation so that the striking device rises and falls vertically,
The drive roller detachment mechanism has a configuration in which the drive roller and the guide pipe are separated from each other by being brought into a non-contact state, and the striking device is dropped by its own weight,
An automatic simple dynamic cone penetration tester characterized in that the hitting device is continuously raised and dropped by repeating the contact state and non-contact state with the hitting device by the rotation of the driving roller. The drive roller detachment mechanism is
By a cam mechanism with a protrusion on the drive roller,
The contact between the drive roller and the guide pipe is removed from the contact state, and is released.
2. The automatic simple dynamic cone penetration testing machine according to claim 1, wherein the automatic falling dynamic cone penetration testing machine is a mechanism for dropping by the dead weight of the impacting device. The drive roller detachment mechanism is
A rotational displacement measuring device for detecting the rotational speed of the driving roller;
The drive roller side pressing mechanism is equipped with an electromagnetic solenoid,
Wherein said electromagnetic solenoid driven and electronically controlled based on the rotational displacement information obtained from the rotational displacement measuring instrument,
Is disengaged by a non-contact state from the contact state between the guide pipe and the drive roller,
2. The automatic simple dynamic cone penetration testing machine according to claim 1, wherein the automatic falling dynamic cone penetration testing machine is a mechanism for dropping by the dead weight of the impacting device.