JP2001214426A - Automatic penetration test machine and method for holding penetration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic penetration test machine which is able to hold a penetration rod rapidly and a method for holding the penetration rod. SOLUTION: The present invention provides a penetration test machine which is equipped with a loading table 3 installed movably up and down, a chuck unit 5 pivotally mounted on the loading table 3, a driving source section for rotating the chuck unit 5, and the penetration rod 43 held by the chuck unit. The chuck unit 5 is possible to be perforated as the penetration rod 43 passes through it and has engaging means at the perforated point by the penetration rod, while the rod is provided with a hook stop connectable with engaging means of the chuck unit, these components are configured so as to engage automatically by shifting engaging means to the hook stop point through lifting movement of the loading table.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic penetration tester for judging various types of soil at different depths and for examining the hardness and tightness of the ground and a method of holding a penetration rod.

[0002]

2. Description of the Related Art Conventionally, at various types of civil engineering work sites, in order to carry out the work safely and efficiently, an investigation of the ground at the site is carried out before construction work is carried out. This ground survey is carried out by a so-called penetration test, in which various soil properties are determined at each depth, and depending on the type of the soil, the hardness and firmness of the ground and the degree of compaction are determined. In performing this penetration test, various penetration test machines are used. Is used.

[0003] A typical example is shown in the drawing and will be described below.
A penetration tester 100 shown in FIG. 15 has a loading platform 102 which can be moved up and down along a frame 101, and a clamp 104 which holds an axial penetration rod 103 on the loading platform 102.
And the clamp 104 is connected to the clamp 104 by a chain (not shown).
3 is provided with a motor 105 for rotationally driving the motor. The clamp 104 is composed of a hammer chuck that is widely used for holding various shaft-like members, and a penetrating rod 103 held by the clamp 104 has a substantially conical shape and a spiral groove formed on the outer periphery at the tip. The body 106 is connected. In addition, a weight hook 107 protrudes in front of the loading table 102, and a weight 108 for adjusting a load applied to the penetration rod 103 at the time of the penetration test is suspended on the weight hook 107. The penetration rod 103 in this penetration tester is used after several replenishments during the penetration test in order to obtain a length up to the target depth of the penetration test.

[0004] The penetration test is performed by using a weight 1 of the penetration tester 100.
07, the weight 108 is gradually suspended until the weight reaches a predetermined value, and the penetrating body 103 is sunk into the ground by the load. After the subsidence of the penetrating body 103 is stopped, the motor 105 is rotationally driven to drive the penetrating rod. By rotating the 103, the penetrating body 103 penetrates into the ground and proceeds while recording various data, and the soil quality is determined based on the collected data. In the penetration test, the penetration speed may be abnormally high depending on the type of soil while the penetration body 103 is being rotated to penetrate the ground. This is generally called self-sinking, in which the penetrating body 103 sinks into the ground irrespective of rotation, and the judgment of the occurrence of self-sinking depends on the visual judgment of the worker.

[0005]

However, in the above-described conventional penetrating test machine, the penetrating rods must be sequentially added in order to penetrate the penetrating rods to a predetermined depth. In the extension of the penetrating rod, a new penetrating rod is connected to the end of the penetrating rod penetrating into the ground, and then the clamp is operated to hold the newly connected penetrating rod. In the clamp, there was a problem that it took time and effort to hold the penetrating rod.

[0006]

According to the present invention, there is provided a loading platform provided to be able to move up and down, a chuck unit rotatably arranged on the loading platform, a driving source unit for rotating the chuck unit, and the chuck. An automatic penetration tester provided with a penetration rod held by a unit, wherein the chuck unit automatically engages with the locking portion by matching with a locking portion provided on the penetration rod. It is characterized by having a combining means.

Further, the present invention provides a loading platform provided to be able to move up and down, a chuck unit rotatably arranged on the loading platform, a driving source unit for rotating the chuck unit, and a chuck unit held by the chuck unit. An automatic penetrating tester comprising: a penetrating rod; and the chuck unit includes an engaging means at a position where the penetrating rod can penetrate and penetrate the penetrating rod. Is provided with a locking portion that engages with the engaging means, and is configured to move the engaging means to the locking portion position by a lifting / lowering operation of the loading platform to engage them. It is also a feature. Here, it is preferable that the engaging means of the chuck unit has a structure in which the engaging means automatically engages with the engaging part of the penetrating rod when the engaging means coincides with the engaging part of the penetrating rod in accordance with the elevating operation of the loading platform.

The present invention also relates to an extension penetrating rod connected to a penetrating rod held by a chuck unit provided on a loading platform capable of moving up and down, and provided on a penetrating rod already held by the chuck unit. The engagement between the engagement portion of the chuck unit and the engagement means of the chuck unit is released, and the chuck unit is moved along the penetrating rod by moving the loading platform up and down, whereby the engagement means is extended and penetrated. The extension unit penetrating rod is held by the chuck unit by moving the engagement unit of the chuck unit to an engagement unit provided on the extension penetrating rod by moving the chuck unit to the engagement unit position of the rod. It is also a thing. In this case, by moving the loading unit up and down, the chuck unit is moved along the penetrating rod, and the chuck unit is rotated by the drive of the driving source unit, so that the engaging means is moved to the locking position of the penetrating rod for extension. More preferably, it is moved.

[0009]

According to the automatic penetration tester of the present invention, the engaging means is automatically engaged with the engaging portion by matching the engaging means of the chuck unit with the engaging portion of the penetrating rod. A penetrating rod can be retained.
Further, when the penetrating rod is extended, the loading unit is moved up and down to move the chuck unit to the engaging portion provided on the extended penetrating rod by the engagement means, thereby holding the extended penetrating rod in the chuck unit. can do.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. 3 and 4, reference numeral 1 denotes an automatic penetration tester, which is roughly divided into a pair of frames 2 placed in parallel with each other, and a loading platform 3 which is guided by the frames 2 and can move up and down.
A drive source unit 4 installed on the loading platform 3;
A chuck unit 5 placed above and rotated by the drive of the drive source unit 4, and a torque detector 6 disposed on the loading platform 3 and detecting a load torque transmitted from the chuck unit 5.
A speed adjustment unit 7 located on the loading platform 3 for adjusting the ascent and descent speed of the loading platform 3; and a speed detection unit located on the loading platform 3 and detecting the ascent and descent speed of the loading platform 3. It comprises a unit 8 and a control unit 9 for controlling the operation of each unit. Hereinafter, the configuration of each of these units will be described in detail.

The frame 2 is composed of two vertically arranged frame members in which a vertical frame member 2a and a horizontal frame member 2b are joined in an inverted T-shape. The vertical frame member 2a is joined by a rear plate 2c located on the rear side of the vertical frame member 2a, and its outwardly facing side surface is opened at a constant width over its entire length. 3 is constituted so as to form a guide path for guiding up and down.

A loading table 3 shown in FIGS. 5 to 9 is fitted to the frame 2 so as to be vertically movable. The loading table 3 is formed in a box shape having a hollow inside, and two rollers 3a are rotatably disposed on both inner side surfaces of the loading table 3, respectively. The frame 2 is fitted to the vertical frame member 2a. A weight holder 3b, on which a weight of a predetermined weight is constantly suspended, is protrudingly provided on the front surface of the loading table 3. The weight holder 3b is equipped with all the components on the loading table 3. Insufficient weight 3c is suspended so that the weight becomes 100 kgf.

The drive source unit 4 is disposed at the rear of the loading table 3 described above. In the present embodiment, the drive source unit 4 is a motor, and the following description will be made with the drive source unit 4 as the motor 4. The motor 4 is installed so that an output shaft 4a protrudes from the upper surface of the loading platform 3, and a first sprocket 4b is attached to the output shaft 4a.
Are rotatably supported integrally.

A torque detector 6 is arranged at a position adjacent to the motor 4 at the rear of the loading table 3. This torque detector 6
Has a first input shaft 10 protruding from the upper surface of the loading platform 3, as shown in FIGS. 11 and 12, a second sprocket 11 is connected to an upper end of the first input shaft 10,
An electromagnetic clutch 12 is connected to the lower end. The electromagnetic clutch 12 couples and releases two opposing disks (not shown) by an electromagnet. The first input shaft 10 is connected to one disk, and the other disk is provided below the electromagnetic clutch 12. The second input shaft 13a of the located planetary gear mechanism 13 is connected.

The planetary gear mechanism 13 has a second input shaft 13a.
A sun gear 13b connected to the lower end;
b, three planetary gears 13c meshing therewith and rotatably supported by an output shaft 13d positioned on the lower surface side, and tooth portions formed on the planetary gears 13c and the inner peripheral surface thereof. And an internal gear 13e meshed with
On the upper surface of the internal gear 13e, two springs 14 extending in a direction tangential to the outer periphery thereof and constantly biasing the internal gear 13e in one rotation direction are arranged point-symmetrically with respect to the center of the internal gear 13e. In addition, a sector-shaped slit plate 15 is also connected to the internal gear 13e. The slit plate 15 is formed with a slit 15a having a concave-convex shape formed continuously in an arc portion thereof.
At the position of the slit 15a, two photoelectric sensors 16 are arranged at a predetermined interval so as to cover the slit 15a. A third sprocket 1 is provided at the lower end of the output shaft 13d.
3f is connected.

A speed adjusting unit 7 is arranged at a position in front of the torque detecting unit 6 described above. As shown in FIG. 10, the speed adjusting unit 7 controls the first input shaft 1 in the torque detecting unit 6.
It has a rotatable first shaft 17 located in front of the first input shaft 10 with an axis parallel to 0, a fourth sprocket 18 at the upper end of the first shaft 17, and a bevel gear 19 at the lower end. Each is rotatably supported integrally. A transmission shaft 20 having an axis crossing the first shaft 17 is provided below the first shaft 17.
Is rotatably supported by a support 3d disposed on the loading platform 3, and one end of the transmission shaft 20 is provided with a first
Bevel gear 1 of the same shape meshing with bevel gear 19 of shaft 17
A one-way clutch 21 for transmitting rotation in only one direction is connected to the other end.

A one-way clutch 21 is connected to a second shaft 22 located coaxially with the transmission shaft 20, and a powder brake 23 and a first gear 24 are fitted and fixed to the second shaft 22, respectively. ing. Powder brake 23 is support base 3
d, an inner ring (not shown) located inside the outer ring 23a, and a powdery material (not shown) which is sealed in a powder chamber provided between the outer ring 23a and the inner ring and changes in volume by a magnetic force. And powder. The inner race of the powder brake 23 is fixed to the second shaft 22 so as to be integrally rotatable therewith.
The inner ring and the outer ring 23a according to the volume change of the powder in 3
The rotational speed of the second shaft 22 can be controlled by the frictional resistance generated between the second shaft 22 and the second shaft 22.

A second shaft 2 is provided obliquely below and in front of the second shaft 22.
A second gear 25 having an axis parallel to the second gear and meshing with the first gear 24, and a third gear 26 having a diameter smaller than the diameter of the second gear 25 are integrally rotatably fixed. A third shaft 27 is disposed, and has an axis parallel to the axis of the third shaft 27 obliquely above and in front of the third shaft 27, and meshes with the third gear 26 of the third shaft 27. A fourth shaft 30 to which a four gear 28 and a sprocket 29 meshing with the guide chain 2d of the frame 2 are integrally rotatably fixed is provided. The sprocket 29 is
The gear 2 is engaged with a guide chain 2d which is arranged to extend in the vertical direction on the back plate 2c.

The speed detector 8 is arranged on the extension of the axis of the fourth shaft 30 in the speed adjuster 7 described above. As shown in FIGS. 1 and 2, the speed detecting section 8
A rack 2e, which is an example of a guide member extending in the vertical direction on the rear plate 2c, a detection shaft 31 which is coaxial with the fourth shaft 30 and has both ends rotatably supported, and a detection shaft 31 A disk-shaped slit disk 32, which is an example of a pulse generating unit which is inserted and fixed so as to be rotatable integrally with the disk 31, and is inserted and fixed so as to be rotatable integrally with the detection shaft 31 similarly to the slit disk 32 and the rack 2e. A pinion gear 33 is an example of a rotating unit that meshes with the optical disk, and two photoelectric sensors 34 are an example of a pulse detection unit arranged at predetermined intervals on the circumferential portion of the slit disk 32. An irregular slit 32a is formed around the entire circumference of the slit disk 32 in the speed detecting section 8 over the entire circumference.

A chuck unit 5 is disposed in front of the mounting table 3. The chuck unit 5 has a shape protruding above and below the loading platform as shown in FIG.
It has a pedestal 35 attached to the upper surface, and a cylindrical bearing case 36 hanging down from the loading platform 3 is connected to the lower surface of the pedestal 35. A cylindrical rotation transmitting sleeve 37 is rotatably disposed inside the bearing case 36 via a bearing, and a fifth sprocket 38 is integrally formed at the lower end of the rotation transmitting sleeve 37. It is rotatably fixed, and a cylindrical relay sleeve 39 is screwed into the upper end so as to rotate integrally. Further, a cylindrical guide sleeve 40 is fixed on the upper surface of the relay sleeve 39, and a spring 5a is fitted on the outer periphery of the guide sleeve 40. A biased cylindrical slide sleeve 41 is inserted therethrough.

In the vicinity of the tip of the guide sleeve 40,
A through hole 40a penetrating from the outer periphery to the inner periphery is formed at three places so as to divide the circumference into three parts.
, A steel ball 42 is operably stored. Also, a guide sleeve is provided at the center of the guide sleeve 40 at the center thereof.
Disc-shaped stopper 4 with a hole of the same diameter as
0b is provided so as to protrude in the outer peripheral direction. Further, the inner peripheral surface of the slide sleeve 41 has an inner hole slightly larger than the outer peripheral surface of the guide sleeve 40 formed from the lower surface, and a larger inner hole formed continuously above the inner hole. A steel formed in a stepped inner peripheral surface including an inner hole and located in the through hole 40a of the guide sleeve 40 by sliding the slide sleeve 41 downward along the outer periphery of the guide sleeve 40. The ball 42 is configured to be operable to the extent that it does not fall out of the through hole 40a, and a groove 41a is cut inward on the lower surface side in the vertical direction.
The head of a stopper screw 40c screwed into the outer periphery of the guide sleeve 40 is engaged with the groove 41a, and the guide sleeve 40 is rotated by rotating the slide sleeve 41.
Are also configured to rotate together.

The penetrating rod 43 is integrally and rotatably held by the chuck unit 5. This penetrating rod 4
Reference numeral 3 denotes a shaft-shaped member having a total length of 1000 mm, and a penetrating body 44 called a screw point is attached to the tip of the shaft-shaped member. In this embodiment, this penetrating body 44 is made of JI
It is manufactured based on the Swedish sounding test method of S Standard A1221. A spiral groove 44a having a spiral shape is formed on the outer peripheral surface of the substantially conical penetrator 44 having a total length of 200 mm over the entire length. . An upper part of the penetrating rod 43 is screwed with an adapter 45 having a total length of 250 mm and made of a shaft having the same diameter as the penetrating rod 43, and the upper part of the adapter 45 is cut into a locking groove 45a by dividing its outer circumference into three equal parts. A steel ball 42 of the guide sleeve 40 is configured to be fittable, and an external thread 45b is formed at the upper end of the adapter 45 to form another penetrating rod 43.
Are connectable.

On the other hand, a cable (not shown) for extracting each piece of speed information is connected to the speed detecting section 8 and the speed adjusting section 7, and these cables are communicated with the control section 9 to communicate therewith. I have. The control unit 9 is configured to process the lifting / lowering speed information of the loading platform 3 sent from the speed detection unit 8 and to send an operation command signal to the speed adjustment unit 7. The rotation information of the slit plate 15 sent from the sensor 16 is also converted into a torque value. The control unit 9 is provided with a printer 9a, which is capable of outputting necessary data at the time of a penetration test.

Each of the sprockets in the motor 4, the torque detector 6, and the speed adjuster 7, that is, the first sprocket 4b, the second sprocket 11, and the fourth sprocket 18, have a driving chain as shown in FIG. , The rotational drive of the drive source unit 4 is reliably transmitted to each unit, and the torque detector 6 and the third sprocket 13f in the chuck unit 5
As shown in FIG. 4, a transmission chain 48 is wound between the fifth sprockets 38 via four relay sprockets 47, and the rotation output from the planetary gear mechanism 13 of the torque detector 6 is provided. Is transmitted to the chuck unit 5.

The automatic piercing tester 1 of the present invention having the above configuration lowers the loading platform 3 and penetrates into the ground while rotating the piercing body 44 by driving the driving source unit 4.
While detecting the load torque value that the penetrating body receives in the ground, the penetration speed of the penetrating body 44, that is, the descending speed of the loading platform 3 is strictly controlled to always stably penetrate the penetrating body 44, and it is extremely accurate. A penetration test is performed. In order to make this more clear, the operation of the automatic penetration tester 1 will be described in detail below.

First, the penetration rod 4 is inserted into the chuck unit 5.
3 is inserted from below and held. The penetrating rod 43 used at this stage has a penetrating body 44 connected to the tip thereof. When holding the penetrating rod 43, first, the slide sleeve 41 of the chuck unit 5 is guided by a guide sleeve.
Pulling the steel ball 42 downward in the through hole 40a with the stepped shape of the inner peripheral surface of the slide sleeve 41, and subsequently inserting the penetrating rod 43 into the guide sleeve 40, Guide thread near upper end of adapter 45
When the penetrating rod 43 is rotated while the slide sleeve 41 is opened while the slide sleeve 41 is opened, the steel ball 42 engages with the locking groove 45a of the adapter 45, and the slide sleeve 41 is accordingly moved. It moves upward by the force of the spring 5a, and its inner peripheral surface covers the through hole 40a of the guide sleeve 40, disabling the steel ball 42 and holding the penetrating rod 43.

After the holding of the penetrating rod 43 is completed, when a start switch (not shown) in the controller 9 is pressed, a drive command for the motor 4 is output from the controller 9 and the motor is driven.
Is driven. The driving of the motor 4 is transmitted from the first sprocket 4b of the output shaft 4a to the driving chain 46, and the second sprocket 11 is transmitted from the driving chain 46.
And input from the first input shaft 10 to the electromagnetic clutch 12. At this time, the electromagnetic clutch 12 is in a state in which two disks (not shown) are separated from each other, and rotation is not transmitted to components thereafter, that is, components after the planetary gear mechanism 13.

On the other hand, the driving of the motor 4 is transmitted to the second sprocket 11 and simultaneously to the fourth sprocket 18. The first shaft 17 starts rotating by the drive of the motor 4 transmitted to the fourth sprocket 18, and the rotation of the first shaft 17 is transmitted to the transmission shaft 20 by the bevel gear 19. At this time, the transmission shaft Since the rotation direction transmitted to the motor 20 is a direction in which rotation cannot be transmitted by the one-way clutch 21, the rotation is transmitted to components such as the powder brake 23 connected to the transmission shaft 20 via the one-way clutch 21. Nothing.

In the state where the drive of the motor 4 cannot be transmitted halfway, the tip end of the penetrating body 44 is grounded to the ground surface to stand by. At this time, powder brake 23
Is applied with a voltage that produces the maximum braking force. The braking force is transmitted to the sprocket 29 by the second shaft 22, the third shaft 27, and the fourth shaft 30, and the sprocket 29 meshes with the guide chain 2d. In this state, the loading platform 3 cannot descend. In this state, a voltage load command is output from the control unit 9 to the powder brake 23 of the speed adjusting unit 7, the voltage applied to the powder brake 23 changes, and the braking force of the powder brake 23 decreases. Can be As a result, the second shaft 22, the third shaft 27, the fourth shaft
The shaft 30 becomes rotatable, and the loading platform 3 descends along the frame 2 by weight.

When the braking force of the powder brake is weakened, the weight of the loading platform is applied to the penetrating body 44, and the penetrating body 44 sinks into the ground. However,
At this time, the sprocket 29 is
7. Because the braking force of the powder brake 23 transmitted by each gear of the fourth shaft 30 is received, the penetrating body 44 has a weight of 50 kg instead of the load of 100 kgf which is the equipment weight of the loading platform 3.
A load corresponding to kgf is applied, and the penetrating body 44
It stops when it reaches the depth where it can sink with a load of 0 kgf.

When the subsidence of the penetrator 44 stops, the voltage applied to the powder brake 23 changes again. At this time, the voltage applied to the powder brake 23 is
Is a voltage at which the powder brake 23 generates a braking force corresponding to a load of 75 kgf. The penetrator 44 further sinks into the ground due to a change in this voltage, and
It stops when it reaches the depth where it can sink by the load of f.

When the subsidence of the penetrating body 44 stops at a load of 75 kgf, the supply of the voltage to the powder brake 23 is subsequently stopped. As a result, the braking force of the powder brake 23 disappears, and a load of 100 kgf, which is the original equipment weight of the loading platform 3, is applied to the penetrating body 44, and the penetrating body 44 starts sinking again into the ground, and Stops when the load reaches the depth where it can sink.

As described above, while the braking force of the powder brake 23 is changed in three stages to lower the penetrating body 44 into the ground, the pinion gear 33 of the speed detecting section 8 is moved with the lowering of the loading platform 3. Accordingly, the detection shaft 31 and the slit disk 32 also rotate along with the rotational movement along the rack 2 e of the drum 2, and the rotation of the slit disk 32 causes the photoelectric sensor 34 to detect a pulse. The detected pulse is converted into the amount of penetration of the penetrating body in the control unit 9, and based on this, the penetration speed for each predetermined amount of penetration is divided from the time per unit number of pulses measured by a timer (not shown) in the control unit 9. Will be issued.

When the subsidence of the penetrating body 44 stops with a load of 100 kgf, the electromagnetic clutch 12
Operates to transmit the rotation of the motor 4 to the planetary gear mechanism 13. The rotation input to the planetary gear mechanism 13 is 1 /
After the speed is reduced to 4, the output is output from the output shaft 13d to the third sprocket 13f. The rotation output to the third sprocket 13f is further transmitted to the fifth sprocket 38 in the chuck unit 5 by the transmission chain 48, whereby the rotation transmission sleeve 37 and the relay sleeve 3 are transmitted.
9. The guide sleeve 40 and the slide sleeve 41 start rotating. Accordingly, the chuck unit 5
The penetrating rod 43 held in the ground also starts rotating, and the penetrating body 44 that has been stopped underground starts to penetrate the ground again by rotating.

When the penetrating body 44 starts to penetrate into the ground while rotating, a rotational load torque from the soil acts on the penetrating body 44, and this rotational load torque is transmitted from the penetrating rod 43 to the chuck unit 5, and further. The transmission extends to the planetary gear mechanism 13 via the transmission chain 48. At this time, since the internal gear 13e of the planetary gear mechanism 13 is in a semi-fixed state supported by the spring 14, when the rotational load torque is transmitted from the sun gear 13b to the internal gear 13e via the planetary gear 13c. The internal gear 13e rotates while compressing the spring according to the rotational load torque value. This internal gear 1
The slit plate 15 also rotates with the rotation of 3e, and a considerable amount of pulses are detected from the photoelectric sensor 16 in accordance with the movement of the slit 15a due to the rotation of the slit plate 15. This detection pulse is sent to the control unit 9 and converted into a torque value.

After the penetrating body 44 starts to penetrate into the ground while rotating, it is measured by a timer (not shown) based on the amount of penetration obtained by a pulse from the slit disk 32 in the control unit 9. From the time per unit number of pulses, the penetration speed for each predetermined amount of penetration is continuously determined, and the number of rotations of the penetrator 44 during the predetermined amount of penetration is also calculated from the time per unit number of pulses. . The above-described measurement of the torque value is performed for each predetermined amount of penetration.

When the penetration speed exceeds a predetermined value during the process in which the penetrating body 44 penetrates into the ground by the rotational force, the electromagnetic clutch 12 is disengaged and the rotation transmission from the motor 4 to the planetary gear mechanism 13 is cut off. Then, the rotation of the penetrating rod 44 is stopped.
At the same time, a voltage is applied to the powder brake 23,
With this voltage load, the powder brake 23 generates a braking force such that the load exerted on the penetrator 44 by the loading platform 3 becomes 75 kgf. If the sinking of the penetrating body 44 does not stop, the load voltage of the powder brake 23 is further increased, and the powder brake 23 generates a braking force such that the load exerted by the loading platform 3 on the penetrating body is 50 kgf. I do. Intruder 4
When the subsidence of the penetrating body 4 stops, the penetrating body 44 is penetrated again from the above-described penetrating operation in which the penetrating body 44 is not rotated. When the penetration speed of the penetrating body 44 becomes lower than a predetermined value,
The penetration of the penetrating body 44 stops at that position, and a buzzer (not shown) operates.

The penetration test using the automatic penetration tester 1 is performed up to about 15 m in the ground. Therefore, during the penetration test, the penetration rod 43 must be extended by adding the penetration rod 43 several times. When the loading platform 3 reaches a preset bottom dead center during the piercing operation, the operation of the automatic piercing test machine 1 is stopped at that position.

Thereafter, a new penetrating rod 43 is screwed into the upper end of the penetrating rod 43 held by the chuck unit 5 to lower the slide sleeve 41 of the chuck unit 5 along the guide sleeve 40, 30 °
The slide sleeve 40 is rotated. By rotating the slide sleeve 41, the stopper screw 40c of the guide sleeve 40 is turned into the groove 41a of the slide sleeve 41.
, The guide sleeve 40 also rotates, whereby the steel ball 42 fitted in the locking groove 45a of the adapter 45 separates from the locking groove 45a, and
Abuts on the unformed outer peripheral surface of the locking groove 45a.
In this state, the steel ball 42 projects from the outer peripheral surface of the guide sleeve 40 as shown in FIG.
The stepped inner peripheral surface of the bush 41 is locked to the protrusion of the steel ball 42. Therefore, even if the force of pulling down the slide sleeve 41 is released, the slide sleeve 41 stops at that position.

Subsequently, when the motor 4 is driven in a direction opposite to that in the original penetration test, this rotation is performed by the first sprocket 4b,
The power is transmitted to the first shaft 17 via the drive chain 46 and the fourth sprocket 18, and is transmitted from the first shaft 17 to the transmission shaft 20 via the bevel gear 19. At this time, since the driving of the motor 4 is reverse, the one-way clutch 21 transmits the rotation, and the rotation of the transmission shaft 20 is transmitted to the second shaft 22, the third shaft 27, and the fourth shaft 30, and the sprocket 29 is a guide chain
2d. This allows the loading platform 3
Begins to rise along frame 2.

At this time, since the electromagnetic clutch 12 is disengaged, the chuck unit 5 does not rotate, and no voltage is applied to the powder brake 23.
When the loading platform reaches a predetermined position, it is stopped by the braking force of the powder brake 23. This stop position is near the position where the guide sleeve 40 of the chuck unit 5 is located near the locking groove 45a of the adapter 45 of the new penetrating rod 43.
At the same time as the lifting of the loading table 3 is stopped, the drive of the motor 4 is switched to the forward drive, and at the same time, the electromagnetic clutch 12 is operated to transmit the drive of the motor 4 to the chuck unit 5.

As a result, the chuck unit 5 rotates, and with the rotation of the chuck unit 5, the steel ball 42 fits into the locking groove 45a of the adapter 45, and the slide sleeve 41 moves upward by spring force. Then, the inner peripheral surface covers the through hole 40a of the guide sleeve 40, the operation of the steel ball 42 is sealed, and the connection of the new penetration rod 43 is completed.
The penetration test thereafter is continuously performed from the state before the extension of the penetration rod 43. When the extension of the penetration rod 43 is repeated and the penetration body 44 reaches a target penetration amount, the penetration test is terminated at that time.

While the work of adding the penetration rod 43 is being performed, the test data up to that time is output from the printer 9a of the control unit 9. In this test data, the torque value at a predetermined amount of penetration, the number of rotations of the penetrating body 44 between the predetermined amount of penetration, and the number of rotations of the penetrating body 44 per meter calculated from the number of rotations of the penetrating body 44 between the predetermined amount of penetration are obtained. After the penetration test is completed, the operator determines the soil quality at a predetermined penetration amount from these data.

[0044]

According to the present invention, the penetrating rod can be automatically held by the chuck unit, and the operation of holding the penetrating rod can be performed quickly and easily. Also, when the extension rod is extended and the extended penetration rod is held by the chuck unit, there is an advantage that this can be easily performed.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a speed detector in an automatic penetration tester according to the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a side view of the automatic penetration tester according to the present invention.

FIG. 4 is a rear view of the automatic penetration tester according to the present invention.

FIG. 5 is an enlarged plan view of a loading platform in the automatic penetration testing machine according to the present invention.

FIG. 6 is an enlarged bottom view of a loading platform in the automatic penetration tester according to the present invention.

FIG. 7 is an enlarged plan view illustrating the internal structure of the loading platform in the automatic penetration tester according to the present invention.

FIG. 8 is an enlarged side view illustrating the internal structure of the loading platform in the automatic penetration tester according to the present invention.

FIG. 9 is an enlarged side view illustrating the internal structure of the loading platform in the automatic penetration tester according to the present invention.

FIG. 10 is an enlarged sectional view of a main part of a speed adjusting unit in the automatic penetration tester according to the present invention.

FIG. 11 is an enlarged sectional view of a main part of a torque detector in the automatic penetration tester according to the present invention.

FIG. 12 is a sectional view taken along line AA of FIG. 11;

FIG. 13 is an enlarged sectional view of a main part of a chuck unit in the automatic penetration tester according to the present invention.

FIG. 14 is an enlarged sectional view of a main part of a chuck unit in the automatic penetration tester according to the present invention.

FIG. 15 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automatic penetration testing machine 2 Frame 3 Loading table 3c Weight 4 Drive source part (motor) 5 Chuck unit 6 Torque detection part 7 Speed adjustment part 8 Speed detection part 9 Control part 12 Electromagnetic clutch 13 Planetary gear mechanism 14 Spring 15 Slit plate 17 First shaft 21 One-way clutch 22 Second shaft 23 Powder brake 27 Third shaft 29 Sprocket 30 Fourth shaft 31 Detection shaft 32 Slit disk 33 Pinion gear 34 Photoelectric sensor 40 Guide sleeve 40a Through hole 41 Slide sleeve 42 Steel ball 43 Penetrating rod 44 Penetrating body 45 Adapter 45a Locking groove 46 Driving chain 48 Transmission chain

Claims (5)

[Claims] 1. A loading platform provided to be able to move up and down, a chuck unit rotatably arranged on the loading platform, a driving source unit for rotating the chuck unit, and a penetrating rod held by the chuck unit. An automatic penetration tester comprising: wherein the chuck unit includes an engagement unit that automatically engages with the locking portion by matching with a locking portion provided on the penetration rod. Features an automatic penetration tester. 2. A loading platform provided to be able to move up and down, a chuck unit rotatably arranged on the loading platform, a driving source for rotating the chuck unit, and a penetrating rod held by the chuck unit. An automatic penetration tester comprising: the chuck unit having an engagement means at a position where the penetration rod can be inserted and penetrated by the penetration rod, and the engagement unit with the penetration rod. A locking portion for engaging with the means is provided, wherein the engaging means is moved to the locking portion position by a lifting / lowering operation of the loading platform to engage them. Penetration testing machine. 3. The engaging means of the chuck unit has a structure in which the engaging means automatically engages with the engaging portion of the penetrating rod when the loading unit coincides with the engaging portion of the penetrating rod as the loading platform moves up and down. The automatic penetration tester according to claim 2. 4. An extension penetrating rod is connected to a penetrating rod held by a chuck unit provided on a loading platform capable of moving up and down, and a locking portion provided on the penetrating rod already held by the chuck unit. And disengaging the chuck unit from the engaging means of the chuck unit, and moving the chuck unit along the penetrating rod by raising and lowering the carrier, thereby locking the engaging means with the penetrating rod for extension. Holding the penetrating rod by engaging the engaging means of the chuck unit with a locking portion provided on the penetrating rod for extension and holding the penetrating rod for extension on the chuck unit. Method. 5. The engaging portion of the penetrating rod for extending the engaging means by moving the chuck unit along the penetrating rod by moving the loading table up and down, and rotating the chuck unit by driving the driving source. The method for retaining a penetrating rod according to claim 4, wherein the method is moved to a position.