JP2005009253A - Automatic penetration testing machine and method for pulling out penetration rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic penetration testing machine and a method for pulling out a penetration rod by which the penetration rod can be pulled out surely from a ground. <P>SOLUTION: The automatic penetration testing machine has a vertically movable platform 3 lifted and lowered and operated along a support 2, a lifting-lowering unit 7 mounted on the ramp 3 and lifting and lowering and operating the platform 3, a chuck rotary driving means 5 arranged to the ramp 3, a rod chuck 4 receiving the driving of the driving means 5 and being rotated, the penetration rod 6 rotatably held together with the rod chuck and a control means 40 driving the unit 7 so that the platform 3 is elevated as the rod 6 is left as it is held to the chuck 4 while turning the chuck 4 by driving the driving means 5 as required. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic penetration testing machine and a method for pulling out the penetrating rod, which collects various data by penetrating the penetrating rod into the ground, investigates the ground strength of the land, and pulls out and collects the penetrating rod after the survey is completed. About.
[0002]
[Prior art]
When building a relatively small building such as a house, it is necessary to investigate the strength of the ground of the planned construction site. In this investigation, in recent years, a test according to Japanese Industrial Standard A1221 “Swedish Sounding Test Method” (hereinafter referred to as penetration test) has been widely performed.
[0003]
The penetration test consists of a self-sinking penetration that observes the penetration of the penetration rod into the ground with only the load while increasing / decreasing the load in increments of 250N, and the penetration rod is driven by rotating the penetration rod under a load of 1KN (1000N). This is done in combination with rotational intrusion to observe the situation. That is, the penetrating rod self-sinks while increasing / decreasing the load in increments of 250 N, and when the penetrating rod stops self-sinking only with a load of 1 KN, the penetrating rod is rotationally driven while rotating under the load condition. If the penetration speed of the penetration rod increases during this rotation penetration, the rotation is stopped and the self-subduction penetration with only the load applied is switched. At this time, the load is generally reduced until the penetration speed becomes a predetermined speed or less. In such a penetration test, the load value during self-sink penetration, and the number of half rotations of the penetration rod for each predetermined penetration amount (number of rotations counted as one rotation of the rod as 2) during rotation penetration are tested. Recorded as data. After the test, the converted N value is obtained from these test data, and the proof stress of the ground can be estimated.
[0004]
The penetration test apparatus shown in Patent Document 1 is known as an apparatus that automates and executes the above-described penetration test. Based on the same standard, a load applied to a rod (penetration rod) as needed is applied. It has a mechanism that can be changed. Whether the penetration test is performed using such a penetration test device or when the penetration test is performed manually, when the penetration test is completed, the rod penetrates to a predetermined depth at the investigation point. It is necessary to remove this. Usually, a pulling device as shown in Patent Document 2 is used for pulling out the rod. However, the penetration test device of Patent Document 1 realizes the pulling of the rod by the test device itself. That is, when the rod is pulled out by this penetration test device, the lifting cylinder is extended while the required portion of the rod is clamped to the chuck portion, and the loading portion is lifted by a predetermined length. Pull out. Next, after releasing the clamp of the rod by the chuck portion and holding the rod by the fall prevention chuck, the loading portion is lowered. Subsequently, the rod is held again on the chuck portion to release the rod from the fall prevention chuck, and thereafter the above-described operation is repeated. As a result, the rod is pulled out from the ground by the ascending stroke of the loading portion.
[0005]
[Patent Document 1] Japanese Patent No. 3056442 [Patent Document 2] Japanese Patent No. 2751046 [0006]
[Problems to be solved by the invention]
The conventional penetration test apparatus uses the lifting operation of the loading portion by the lifting cylinder to try to pull out the rod by the penetration test apparatus itself. However, since soil resistance acts on the rod during the pulling operation, it is often impossible to cope with the lifting force of the lifting cylinder alone, and it is difficult to reliably pull out the rod only by the penetration test device. In particular, in sandy soil and viscous soil containing a lot of moisture, this is remarkable because the resistance acting on the rod is large. In such a case, a drawing device is used instead of the penetration test device. As described above, in the conventional penetration test apparatus, the penetration rod cannot be reliably pulled out, which causes problems such as requiring a corresponding time and labor to change the setup to a dedicated pulling apparatus. It was.
[0007]
[Means for Solving the Problems]
The present invention has been made in view of the above problems, and an object of the present invention is to provide an automatic penetration testing machine and a method of pulling out the penetrating rod that can more reliably pull out the penetrating rod from the ground.
[0008]
In order to achieve the above object, the present invention provides a lifting platform that can be moved up and down along an upright column, a lifting unit that is provided on the lifting platform, and that operates the lifting platform, and is disposed on the lifting platform. A chuck rotation driving means that can be driven forward / reversely, a rod chuck that can be rotated forward / reversely by the drive of the chuck rotation driving means, and a penetrating rod that is rotatably held integrally with the rod chuck. It is characterized by. When the penetrating rod is pulled out after penetrating into the ground, the hoisting unit is driven so that the hoisting table is raised while holding the penetrating rod on the rod chuck, and the chuck rotation driving means is driven as necessary to It is desirable to have control means for rotating the rod chuck.
[0009]
In order to achieve the above object, the present invention provides a lifting platform that can be moved up and down along an upright column, a lifting unit that is provided on the lifting platform and operates to lift the lifting table, and the lifting platform. An arranged chuck rotation driving means, a rod chuck that can be rotated by the drive of the chuck rotation driving means, a penetrating rod that is rotatably held integrally with the rod chuck, and the penetrating rod penetrating into the ground And a control means for driving the lifting / lowering unit so that the lifting / lowering base rises while holding the penetrating rod in the rod chuck and for driving the chuck rotation driving means and rotating the rod chuck as necessary. It is also a thing.
[0010]
In order to achieve the above object, the present invention holds the penetrating rod penetrating into the rod chuck provided in the lifting platform at a position where the lifting platform can be lifted along the support, and then lifts and lowers the lifting unit. The lifting platform is raised by driving and the penetration rod held by the rod chuck is pulled out from the ground while rotating the rod chuck by driving the chuck rotation driving means as necessary.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1 to FIG. 6, reference numeral 1 denotes an automatic penetration testing machine, an elevator 3 that can be moved up and down along a column 2, a chuck 4 that is rotatably provided on the elevator 3, and the chuck 4 that is driven to rotate. A chuck rotation driving means 5 for performing the above operation, a penetrating rod 6 held by the chuck 4, and an elevating unit 7 for elevating the elevating platform 3 along the column 2.
[0012]
The column 2 is erected on the leg 2a, and a chain member 8 as an example of a guide path is linearly arranged and fixed on the back thereof. The chain member 8 meshes with a sprocket 21 of an elevating unit 7 which will be described in detail later.
[0013]
The elevating platform 3 has elevating guide portions 9 along rail portions 2b, 2b formed on both side surfaces of the support column 2. The elevating guide portion 9 incorporates cam followers 9a sandwiching the rail portions 2b, 2b at both upper and lower ends, and the elevating platform 3 along the column 2 can be smoothly moved up and down by the rotation of the cam followers 9a. In addition, a weight 10 for mass adjustment is disposed at the front portion of the lifting platform 3. By the mass adjustment by the weight 10, the load due to the total mass of the lifting platform 3, the chuck 4, the chuck rotation driving means 5, the lifting unit 7 and the like is adjusted to 1 KN.
[0014]
The chuck 4 is rotatably arranged on the lifting platform 3. The structure is basically as shown in Japanese Patent No. 2927704, and has a hollow sleeve 11 in which the penetrating rod 6 is supported so as to be insertable and rotatable. The hollow sleeve 11 is provided with a steel ball 12 that engages with a long groove 6 a formed in the penetrating rod 6, and a sprocket 13 is provided below the steel ball 12. Eighteen circular holes 13a are equally formed around the rotation center of the sprocket 13, and a sensor S is attached to the lifting platform 3 so that the passage of the circular holes 13a can be detected. The sensor S is configured to detect the passage of the circular hole 13 a accompanying the rotation of the sprocket 13, turn it on / off, and send the signal to the control means 40.
[0015]
The steel ball 12 is always supported by a slide sleeve 15 biased by a spring 14 at a position protruding from the hollow hole portion 11a of the hollow sleeve 11, and engages with the long groove 6a of the penetrating rod 6 in this state. . When the slide sleeve 15 is pushed down against the bias of the spring 14, the steel ball 12 becomes operable, and the holding of the penetrating rod 6 can be released.
[0016]
The penetrating rod 6 includes a rod portion 16 having the above-described long groove 6a formed in the upper portion thereof, and a drill-shaped screw point 17 connected to the tip of the rod portion 16. The rod portion 16 is formed with a male screw portion 16a at the upper end and a female screw portion (not shown) at the lower end, and can be extended by one after another.
[0017]
The chuck rotation driving means 5 is an inverter motor and can change the output torque and the number of rotations by changing the power supply frequency. A sprocket 19 is attached to the drive shaft 5 a of the chuck rotation driving means 5 via a one-way clutch 18. An endless chain 20 is wound around the sprocket 19 and the sprocket 13 below the chuck 4 so that rotation can be transmitted from the chuck rotation driving means 5 to the chuck 4.
[0018]
The one-way clutch 18 allows the penetration rod 6 to rotate due to the earth resistance acting on the torsion-shaped screw point 17 when the penetration rod 6 self-sinks into the ground. That is, when the rotation in that direction is transmitted from the penetrating rod 6 side (chuck 4 side), the one-way clutch 18 rotates idly so that the deceleration resistance of the chuck rotation driving means 5 does not hinder the rotation of the penetrating rod 6. Function.
[0019]
The elevating unit 7 is provided at the rear part of the elevating table 3 and is a sprocket 21 as an example of an engaging rotating member that can mesh with the chain member 8 and rotate, and a rotary driving means for elevating that can rotate the sprocket 21. 22 and a powder clutch 23 which is an example of a clutch means. As the sprocket 21 of the lifting unit 7 meshes with the chain member 8 and rotates, the lifting platform 3 moves up and down.
[0020]
The rotary drive means 22 for raising and lowering is an inverter motor having a built-in brake mechanism (not shown) that locks the drive shaft 22a so as not to rotate when the power is cut off. By varying it, it is possible to change the output torque and the rotational speed. A gear shaft 24 integrally formed with a drive gear 24 a is coaxially connected to the drive shaft 22 a of the ascending / descending rotational drive means 22. The gear shaft 24 is coaxially connected via a one-way clutch 25. A stopper gear 26 is attached. The drive gear 24a meshes with an intermediate gear 27 that is rotatably arranged. The intermediate gear 27 meshes with an input gear 28 attached to the powder clutch 23.
[0021]
The powder clutch 23 includes an input shaft 30 that is rotatably provided in the casing 29, and an output shaft 31 that is rotatably provided through the input shaft 30. The input shaft 30 has a two-part structure, and a coupling 32 integral with the output shaft 31 is disposed in the interior thereof with a predetermined gap. A minute magnetic powder (not shown) is enclosed in these gaps. The casing 29 is provided with an electromagnet 33 for exciting the magnetic powder.
[0022]
The powder clutch 23 excites the magnetic powder by the magnetic flux generated by energizing the electromagnet 33, creates a magnetic force adsorption state between the magnetic powders along the magnetic flux, and the frictional resistance between the magnetic powders generated along with this creates an input. A predetermined clutch force is generated between the shaft 30 and the coupling 32. The magnetic powder adsorption state of the magnetic powder varies depending on the magnitude of the magnetic flux density, that is, the energization amount to the electromagnet 33. Therefore, it is possible to connect the input shaft 30 and the output shaft 31 with a predetermined clutch force by changing the degree of sliding between the input shaft 30 and the output shaft 31 by energization control of the electromagnet 33. In addition, since the powder clutch 23 generates a clutch force from the frictional resistance between minute magnetic powders, the clutch force can be changed extremely smoothly when the energization amount is changed.
[0023]
The input gear 28 is connected to the input shaft 30 of the powder clutch 23. As a result, the drive of the ascending / descending rotary drive means 22 can be transmitted to the input shaft 30 through the drive gear 24a, the intermediate gear 27, and the input gear 28.
[0024]
One end of the output shaft 31 of the powder clutch 23 is connected to the sprocket 21 via a planetary gear reducer 34. The planetary gear speed reducer 34 includes a sun gear shaft 35 integrally connected to the output shaft 31, three planetary gears 36 that mesh with a sun gear 35 a formed at the tip of the sun gear shaft 35, and It comprises a carrier 37 that rotatably supports the planetary gears 36. The sprocket 21 is integrally connected to the carrier 37, so that the sprocket 21 receives rotation transmission decelerated by the action of the sun gear 35a and the planetary gears 36. In addition, an encoder 38 is connected to the carrier 37 so that a pulse signal accompanying the rotation of the sprocket 21 can be output.
[0025]
On the other hand, a transmission gear 39 that meshes with the stopper gear 26 is integrally connected to the other end of the output shaft 31. As a result, the drive of the ascending / descending rotary drive means 22 can be transmitted to the output shaft 31 through the gear shaft 24, the one-way clutch 25, the stopper gear 26, and the transmission gear 39. This drive transmission system has one less gear than the drive transmission system to the input shaft 30. Therefore, when the ascending / descending rotation driving means 22 is driven, rotation in the direction opposite to that transmitted to the input shaft 30 is transmitted to the output shaft 31.
[0026]
When the sprocket 21 rotates, the rotation is transmitted to the stopper gear 26 via the output shaft 31 and the like. At this time, the one-way clutch 25 is locked to the gear shaft 24 when the rotation of the sprocket 21 when the elevator 3 is lowered is transmitted to the stopper gear 26 from the sprocket 21 side, and the reverse rotation is the sprocket 21 side. Is transmitted to the stopper gear 26, the gear shaft 24 is idled. In other words, in the drive transmission system of the gear shaft 24 → the stopper gear 26 → the transmission gear 39 → the output shaft 31 → the planetary gear reducer 34 → the sprocket 21, the rotary drive for raising and lowering the sprocket 21 is rotated in the direction in which the elevator 3 is lowered. When the means 22 is driven (hereinafter referred to as “reverse driving”), the gear shaft 24 idles with respect to the stopper gear 26 by the action of the one-way clutch 25. When the up-and-down rotation drive means 22 is driven in the reverse direction (hereinafter, the drive of the up-and-down rotation drive means 22 is referred to as “forward drive”), the gear shaft 24 is integrated with the stopper gear 26 by the action of the one-way clutch 25. Can be rotated. However, this is not the case when the stopper gear 26 rotates at a higher speed than the gear shaft 24 in the same direction as the gear shaft 24.
[0027]
The chuck rotation driving means 5 and the lifting rotation driving means 22 are controlled by a control means 40. This control means 40 receives the command from this control part 41, inverters 42 and 43 that drive and control the chuck rotation drive means 5 and the lifting and lowering rotation drive means 22, respectively, and the energization control of the powder clutch 23. Various control signals such as a test control signal 44, a test start signal, an extraction start signal, a test end signal, a chuck positive rotation command signal and an emergency stop signal, and various setting values necessary for control can be input from a switch, numeric keypad, etc. An input unit 45, a storage unit 46 that stores a control program, control data, test data, and the like, and a display unit 47 for displaying various types of information are provided.
[0028]
The control unit 41 processes the pulse signal output from the encoder 38 to determine the amount of penetration of the penetration rod 6 into the ground, the penetration speed, and the like, and based on the energization command from the clutch control unit 44 to the powder clutch 23. Then, the load applied to the penetrating rod 6 is obtained. Further, the control unit 41 obtains the half rotation number and the rotation number of the penetrating rod as needed from the pulse signal formed by the on / off signal from the sensor S when the penetrating rod 6 is rotating and penetrating.
[0029]
FIG. 7 shows the characteristics of the output torque and the rotational speed with respect to the drive frequency of the inverter motor employed as the chuck rotation drive means 5 and the ascending / descending rotation drive means 22. As shown in FIG. 7, the chuck rotation driving means 5 and the lifting rotation driving means 22 exhibit the maximum output torque in a certain frequency band (40 to 60 Hz). Based on this characteristic, the control unit 41 is configured to adjust the driving frequency of the chuck rotation driving means 5 and the lifting rotation driving means 22 in accordance with the penetration state.
[0030]
Next, the operation of the automatic penetration testing machine 1 will be described along the procedure of the penetration test.
First, in a state where the power before the test is turned off, the magnetic powder of the powder clutch 23 is not excited, so that the output shaft 31 is rotatable with respect to the input shaft 30. Accordingly, the lifting platform 3 tends to descend by its own weight, but at this time, the drive shaft 22a of the lifting rotary drive means 22 is locked so as not to rotate by the action of the brake mechanism. For this reason, the rotation of the sprocket 21 in the descending direction of the lifting platform 3 is transmitted to the stopper gear 26, whereby the one-way clutch 25 is locked. Therefore, the lifting platform 3 cannot be lowered.
[0031]
When the penetration test is started, the lifting rotary driving means 22 is reversely driven by the input operation from the input unit 45 of the control means 40, and the lifting platform 3 is lowered to the place where the tip of the screw point 17 contacts the ground. Subsequently, when a test start signal is input from the input unit 45, the control unit 41 gives a reverse drive command to the inverter 43. In response to this, the inverter 43 reversely drives the elevating rotary drive means 22. Thereafter, under a situation where a load is applied to the penetrating rod 6, the rotary drive means 22 for ascending / descending continues the reverse drive. Further, simultaneously with the start of reverse driving of the ascending / descending rotation driving means 22, the control unit 41 gives a predetermined load change command to the clutch control unit 44. In response to this, the clutch control unit 44 performs energization control of the powder clutch 23 and adjusts the clutch force of the powder clutch 23.
[0032]
Since the tip of the screw point 17 is in contact with the ground surface, the rotational drive means 22 for ascending and descending reversely drives the gear shaft 24 at a sufficiently higher speed than the stopper gear 26 due to the action of the one-way clutch 25. To idle. Therefore, the lifting platform 3 can be lowered, and the load due to the total mass of the lifting platform 3, the chuck 4, the chuck rotation driving means 5, the lifting unit 7, the weight 10 and the like is applied to the penetrating rod 6. On the other hand, by the reverse drive of the rotary drive means 22 for raising and lowering, the input shaft 30 is rotated in the direction in which the sprocket 21 can be rotated in the direction to raise the elevator 3 through the drive transmission system of the gear shaft 24 to the input gear 28. Rotation (rotation in the direction opposite to the rotation direction of the output shaft 31) is transmitted. This is transmitted to the output shaft 31 by the clutch force of the powder clutch 23. For this reason, a corresponding rotational resistance force (force to raise the elevator 3: hereinafter referred to as a raising force) acts on the sprocket 21. As a result, the penetration rod 6 is loaded with a load obtained by subtracting the ascending force from the load 1KN due to the total mass of the lifting platform 3 and the like.
[0033]
As described above, the load applied to the penetrating rod 6 is initially set to 250N, and is increased in the order of 500N, 750N, and 1KN each time the self-sinking of the penetrating rod 6 stops due to soil resistance or the like. That is, the load is changed by controlling the energization of the powder clutch 23 and adjusting the clutch force. For this reason, when a load change is required, it can respond immediately. In addition, since the load of 1KN is a load by the total mass of the elevator 3 etc., when the load of 1KN is loaded, the electricity supply to the powder clutch 23 is cut off. As a result, the magnetic powder is de-energized and the output shaft 31 is rotatable with respect to the input shaft 30, and the penetrating rod 6 is loaded with a load 1 KN based on the total mass of the lifting platform 3 and the like. Further, when the number of pulse signals per unit time of the encoder 38 exceeds a predetermined value under a certain load during self-sinking penetration, that is, when the penetration speed of the penetration rod 6 exceeds a predetermined value, the powder clutch 23 is turned on. The load is reduced until the energization control is performed and the penetration speed becomes a predetermined value or less.
[0034]
During the self-sinking penetration described above, the penetration rod 6 is rotated by the torsion of the screw point 17 due to the resistance of the earth by the action of the one-way clutch 18. For this reason, the penetration resistance due to the resistance of the soil can be reduced and accurate self-sinking can be carried out.
[0035]
When the self-sinking of the penetrating rod 6 stops under a load of 1 KN, the control unit 41 gives a positive drive command to the inverter 42. In response to this, the inverter 42 positively drives the chuck rotation driving means 5 at a predetermined frequency. At this time, the load of 1 KN is maintained as it is. By the positive drive of the chuck rotation driving means 5, the penetration rod 6 rotates in the screwing direction of the screw point 17, and the rotation penetration is executed. In this rotational penetration, the steel ball 12 is engaged with the long groove 6 a of the penetration rod 6, so that no slip occurs between the penetration rod 6 and the chuck 4. It is possible to transmit rotation. During the rotation penetration, when the number of pulse signals per unit time of the encoder 38 exceeds a predetermined value, that is, when the penetration speed of the penetration rod 6 exceeds a predetermined value, the control unit 41 stops driving the inverter 42. In response to the command, the inverter 42 stops driving the chuck rotation driving means 5. Thereafter, the control is switched to the above-described self-sinking penetration.
[0036]
The penetration test is performed while switching between the self-sinking penetration and the rotation penetration described above. On the way, the rod portion 16 is sequentially added to the penetrating rod 6. When the rod portion 16 is added, the ascending / descending rotation drive means 22 and the chuck rotation drive means 5 are temporarily stopped, and an extension rod portion (not shown, but similar to the rod portion 16) is added to the rod portion 16. And the chuck | zipper 4 is rotated, pushing down the slide sleeve 15, the steel ball 12 is made to detach | leave from the long groove 6a, and the holding | maintenance of the penetration rod 6 is released. At this time, the chuck 4 is easily rotated because of the action of the one-way clutch 18. In this state, the rotary drive means 22 for raising and lowering is positively driven by a positive drive command from the control unit 41, and the elevator 3 is raised until the steel ball 12 of the chuck 4 is at the same height as the long groove of the extending rod part. . At this stage, if the phases of the steel ball 12 and the long groove coincide with each other, the steel ball 12 engages with the long groove, and the slide sleeve 15 is lifted and returned by the bias of the spring 14 to hold down the steel ball 12. Therefore, the holding of the penetrating rod 6 is automatically completed. When the phases of the steel ball 12 and the long groove are shifted, the chuck rotation driving means 5 is driven to rotate the chuck 4 and engage the steel ball 12 with the long groove.
[0037]
During the penetration test, the control means 40 records the penetration amount and the load value of the penetration rod 6 at that time in the storage unit 46 every time the load is changed during self-sinking, and also during the rotation penetration, the penetration rod. Every time 6 6 penetrates 250 mm, the half rotation number required for the penetration is recorded in the storage unit 46. These test data are used as basic data for determining the strength of the ground after the end of the test.
[0038]
When the penetration test is completed and the penetration rod 6 is pulled out, a pull start signal is input from the input unit 45. In response to this, the control unit 41 gives a positive drive command with a predetermined torque to the inverter 43 and also gives a release command to the clutch control unit 44. As a result, the inverter 43 positively drives the ascending / descending rotational drive means 22 at a frequency at which an optimum output torque is obtained, and the clutch control unit 44 cuts off the power supply to the powder clutch 23 and the output shaft with respect to the input shaft 30. 31 is rotatable. Thereby, the raising / lowering stand 3 can be raised by force required for extraction of the penetration rod 6, and the penetration rod 7 hold | maintained at the chuck | zipper 4 can be extracted from underground. At this time, when a chuck normal rotation command signal is input from the input unit 45, the control unit 41 gives a positive drive command to the inverter 42, whereby the chuck rotation driving means is positively driven. Thereby, the chuck | zipper 4 thru | or the penetration rod 6 can be rotated in the same direction as the time of rotation penetration, and the resistance of the soil which touches the penetration rod 6 can be reduced. Therefore, the penetration rod 6 can be reliably pulled out from a soil layer having a large resistance, such as sandy soil and viscous soil with a lot of moisture.
[0039]
At the time of pulling out the penetrating rod 6, it is necessary to hold the lower rod portion 16 on the chuck 4 again when the lifting platform 3 rises to the upper limit. In this regard, the elevating rotation driving means 22 is temporarily stopped and the penetrating rod 6 is released from the chuck 4 in the same manner as when the rod portion 16 is added. Subsequently, after the elevator 3 is lowered and the lower rod portion 16 is held by the chuck 4, the pulling operation is continued.
[0040]
In addition to the chuck normal rotation command signal described above, the input unit is configured so that a chuck reverse rotation command signal can be input. When the chuck reverse rotation command signal is input from here, the control unit 41 reversely drives the inverter 42. A command may be given to reverse drive the chuck rotation driving means. As a result, the chuck 4 or the penetrating rod 6 can be reversely rotated in the direction in which the screw point 17 is unscrewed, the resistance of the soil during pulling out can be further reduced, and the penetrating rod 6 can be pulled out more reliably. However, in this case, it is necessary to change the structure of the automatic penetration testing machine 1 for the following two points. First, the one-way clutch 18 is not provided, and the sprocket 19 is directly attached to the drive shaft 5a. As a result, the reverse drive of the chuck rotation driving means 5 can be transmitted to the chuck 4 or the penetrating rod 6. Secondly, as shown in FIG. 8, the end portion of the rod portion 16 and the screw point 17 is fitted, and a connection structure is obtained in which these are fastened by a screw 48. Although not shown here, the connection structure between the rod portion 16 and the extension rod needs to be the same. As a result, even if the penetrating rod 6 rotates in either the forward or reverse direction, each connecting portion between the rod portion 16 and the screw point 17 or the extension rod does not loosen.
[0041]
【The invention's effect】
The present invention includes a chuck rotation driving means that can be driven forward / reversely, and a rod chuck that can be rotated forward / reversely by the drive of the chuck rotation driving means. Then, when the penetrating rod is lifted while the penetrating rod is held by the rod chuck, the penetrating rod is rotated forward and reverse when the penetrating rod is pulled out from the ground. Therefore, the penetration rod can be more reliably pulled out even in a situation where the penetration rod is difficult to come off due to the resistance of the soil. In addition, this reduces the number of cases of using a dedicated drawing machine and the like, so that it is possible to reduce the labor and time for changing to these machines and to quickly pull out the penetrating rod.
[Brief description of the drawings]
FIG. 1 is a block diagram of an automatic penetration testing machine according to the present invention.
FIG. 2 is a front view of the main part of the automatic penetration tester of the present invention.
FIG. 3 is an enlarged cross-sectional view taken along line AA in FIG.
FIG. 4 is an enlarged partial cutaway cross-sectional view of a main part of the automatic penetration tester of the present invention.
FIG. 5 is an enlarged partially cutaway cross-sectional view of a main part according to BB in FIG. 2;
6 is an enlarged partial cutaway cross-sectional view of a main part taken along line CC in FIG. 5;
FIG. 7 is a graph showing output torque characteristics of a chuck rotation driving unit and a lifting / lowering rotation driving unit.
FIG. 8 is an enlarged partial cutaway cross-sectional view showing a main part of another example of the connecting structure of the penetration rod and the screw point.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Automatic penetration test machine 2 Support | pillar 3 Lifting stand 4 Chuck 5 Chuck rotation drive means 6 Penetration rod 6a Long groove 7 Lifting unit 8 Chain member 10 Weight 11 Hollow sleeve 12 Steel ball 13 Sprocket 14 Spring 15 Slide sleeve 16 Rod part 17 Screw point 18 One-way clutch 19 Sprocket 20 Endless chain 21 Sprocket 22 Elevating rotational drive means 23 Powder clutch 24 Gear shaft 24a Drive gear 25 One-way clutch 26 Stopper gear 27 Intermediate gear 28 Input gear 29 Casing 30 Input shaft 31 Output shaft 32 Coupling 33 Electromagnet 34 planetary gear reducer 35 sun gear shaft 35a sun gear 36 planetary gear 37 carrier 38 encoder 39 transmission gear 40 control means

Claims (4)

A lifting platform that can be moved up and down along a standing column;
A lifting unit provided on the lifting platform and operating the lifting platform;
Chuck rotation driving means arranged on the lifting platform and capable of forward / reverse driving;
An automatic penetration testing machine comprising: a rod chuck that can be rotated forward and backward by being driven by the chuck rotation driving means; and a penetration rod that is rotatably held integrally with the rod chuck. When pulling out the penetrating rod after penetrating into the ground, the hoisting unit is driven so that the hoisting table rises while holding the penetrating rod on the rod chuck, and the chuck chuck is driven by driving the chuck rotation driving means as necessary. The automatic penetration testing machine according to claim 1, further comprising a control means for rotating. A lifting platform that can be moved up and down along a standing column;
A lifting unit provided on the lifting platform and operating the lifting platform;
Chuck rotation driving means disposed on the lifting platform;
A rod chuck that can be rotated by the drive of the chuck rotation driving means;
A penetrating rod that is rotatably held integrally with the rod chuck;
When pulling out the penetrating rod after penetrating into the ground, the rod chuck drives the lifting unit so that the lifting platform rises while holding the penetrating rod on the rod chuck, and drives the chuck rotation driving means as necessary to drive the rod chuck. And an automatic penetration tester characterized by having a control means for rotating. Hold the penetrating rod penetrating into the ground in the rod chuck provided on the lifting platform at a position where the lifting platform can be raised along the column, and then lift the lifting platform by driving the lifting unit and if necessary A method of pulling out the penetrating rod, wherein the penetrating rod held by the rod chuck is pulled out from the ground while the rod chuck is rotated by driving the chuck rotation driving means.

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