JPH0874241A - Automatic penetration tester - Google Patents

Abstract

PURPOSE: To automate the self sinking judgement by finding penetrating speed from a pulse number per unit time from a slit by rotation of a slit disc. CONSTITUTION: While sinking a penetrating body underground by a driving source part, a pinion gear 33 of a speed detection part 8 rotationally moves along a rack 2e in accordance with lowering of a loading platform, and as a detection shaft 31 and a slit disc 32 also rotate, a pulse is detected from a photoelectric sensor 34. Dividing of penetrating speed per specified penetrating quantity is continuously carried out from time per a unit pulse number measured by a timer in accordance with penetrating quantity acquired by a pulse from the slit disc 32 at a control part, and the number of rotations of the penetrating body during the specified penetrating quantity is computed from this time per the unit pulse number. In this way, by setting the penetrating quantity per one pulse, it is possible to find the penetrating speed of the penetrating body from the detected pulse quantity per the unit time by the sensor, and by setting a constant standard pulse number, it is possible to precisely judge self-sinking of the penetrating body.

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 soil properties at various depths and investigating the hardness and softness of the ground and the tightness.

[0002]

2. Description of the Related Art Conventionally, in various civil engineering work sites, in order to carry out the work safely and efficiently, the ground of the site is investigated before the construction work is carried out. This ground survey is performed by a so-called penetration test, which determines various soil properties at each depth and knows the hardness and softness of the soil depending on the type of soil, and various penetration test machines are used to perform this penetration test. Is used.

A typical example thereof is shown in the figure and described below.
The penetration tester 100 shown in FIG. 15 has a loading table 102 that can be raised and lowered along a frame 101, and a clamp 104 that holds a shaft-shaped penetration rod 103 on the loading table 102.
The clamp 104 is connected to the clamp 104 by a chain (not shown), and is integrally formed with the clamp 104.
A motor 105 that rotationally drives 3 is provided. The clamp 104 is composed of a hammer chuck that is widely used for holding various shaft-like members, and the tip of the penetrating rod 103 held by the clamp 104 has a substantially conical shape and has a spiral groove formed in the outer peripheral portion. The body 106 is connected. Further, a weight hanging 107 is provided in front of the loading platform 102, and a weight 108 for adjusting a load applied to the penetration rod 103 during a penetration test is suspended on the weight hanging 107. The penetration rod 103 in this penetration tester is used by replenishing it several times 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 the weight hanging 1 of the penetration tester 100.
The weight 108 is gradually suspended until a predetermined weight is reached at 07, and the penetrating body 103 is submerged by the load, and after the submerging of the penetrating body 103 is stopped, the motor 105 is rotationally driven to move the penetrating rod 103. It is rotated and the penetrating body 103 is penetrated into the ground to proceed while recording various data, and the soil quality is determined based on the collected data. In this penetration test, the penetration speed may become abnormally high depending on the type of soil during the penetration of the penetration body 103 into the ground. This is generally called self-sinking, and the penetrating body 103 sinks into the ground regardless of the rotation, and the determination of the occurrence of this self-sinking depends on the visual determination of the operator.

[0005]

DISCLOSURE OF THE INVENTION In the penetration testing machine having the above-mentioned structure, the self-sinking judgment of the penetrating body generated during the penetration test depends on the visual judgment of the operator, and there is a certain judgment standard. However, it has been pointed out that there are individual differences in the self-sinking judgment depending on the workers, which causes a decrease in the reliability of the soil judgment. In addition, in order to determine self-sinking, an operator must always be on the side of the penetration tester during the penetration test and carefully observe the penetration state of the penetrating body. It has been pointed out that there are some drawbacks that make you miss it.

The present invention was created in view of the above problems, and an object of the present invention is to provide an automatic penetration tester in which self-precipitation determination is automated.

[0007]

[Means for Solving the Problems] To achieve the above object,
A loading platform that can be raised and lowered along the frame is arranged, and a chuck unit that can be raised and lowered integrally with this loading platform and that is rotatable, a rotation drive source that rotationally drives this chuck unit, and a detachable unit that adjusts the weight of the loading platform An automatic penetration testing machine for arranging various weights of various weights, holding a penetrating rod having a penetrating body connected to the chuck unit at the tip thereof, and penetrating the penetrating body into the ground by driving the weight of the weight and the rotation drive source. In the above, while a speed detecting section for detecting the ascending / descending speed of the loading table is provided between the frame and the loading table, a control section for processing a signal from the speed detecting section is provided. Specifically, the speed detecting unit is a guide member arranged so as to extend in a vertical direction to the frame, and a rotation unit arranged on the loading platform so as to rotate along the guiding member as the loading platform moves up and down without causing slippage. And a pulse generator that rotates integrally with the rotary unit and replaces the rotation with a pulse, and a pulse detector that detects a pulse from the pulse generator.

[0008]

The automatic penetration tester with the above structure can constantly monitor the penetration speed of the penetrator during the penetration test. In the process of penetrating the penetrator into the ground, it rotates with the movement of the loading platform. The section rotates along the guide member of the frame without slipping, and with the rotation of the rotating section, a considerable amount of pulses are emitted from the pulse generating section according to the rotation of the rotating section, and this pulse is detected by the pulse detection. Detected by the part and sent to the control part, where the penetration speed of the penetrator is determined.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 3 and 4, reference numeral 1 denotes an automatic penetration tester, which is roughly classified into a pair of frames 2 arranged in parallel, and a loading table 3 which is guided by the frames 2 and is vertically movable.
The drive source unit 4 installed on the loading platform 3 and the loading platform 3 described above.
The chuck unit 5 placed on the top and rotated by the drive of the drive source unit 4, and the torque detection unit 6 arranged on the loading table 3 for detecting the load torque transmitted from the chuck unit 5.
And a speed adjusting unit 7 located on the loading platform 3 for adjusting the ascending and descending speeds of the loading platform 3, and a speed detection unit located on the loading platform 3 for detecting the ascending and descending speeds of the loading platform 3. It is composed of a section 8 and a control section 9 for controlling the operation of each of these sections. Hereinafter, the configuration of each of these parts will be described in detail.

The frame 2 includes two vertical frame members 2a and 2b joined together in an inverted T-shape in a horizontal arrangement, and a rear plate 2c located on the rear side of the vertical frame member 2a. The vertical frame member 2a is formed by joining the vertical frame members 2a, the side faces of which are directed outwards with a constant width over the entire length, so that the vertical frame member 2a forms a guide path for guiding the loading table 3 which will be described in detail later. Is configured.

A loading table 3 shown in FIGS. 5 to 9 is fitted on the frame 2 so as to be vertically movable. The loading table 3 has a box shape with a hollow inside, and two rollers 3a are rotatably disposed on both inner side surfaces of the loading table 3. The rollers 3a are vertical frame members of the frame 2. 2a is fitted. Further, on the front surface of the loading platform 3, a weight hanging 3b on which a weight of a predetermined weight is constantly suspended is projected, and the weight hanging 3b is provided with equipment when all parts are arranged on the loading platform 3. The insufficient weight 3c is suspended so that the weight becomes 100 kgf.

The drive source section 4 is arranged at the rear of the loading table 3 described above. In the present embodiment, the drive source unit 4 is a motor, and the drive source unit 4 is used as the motor 4 in the following description. The motor 4 is installed so that the output shaft 4a projects from the upper surface of the loading table 3, and the output shaft 4a has a first sprocket 4b.
Is 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
As shown in FIGS. 11 and 12, has a first input shaft 10 protruding from the upper surface of the loading platform 3, and a second sprocket 11 is connected to the upper end of the first input shaft 10 and
The electromagnetic clutch 12 is connected to the lower end. The electromagnetic clutch 12 connects and disconnects two discs (not shown) facing each other with an electromagnet. The first input shaft 10 is connected to one disc, and the other disc is located below the electromagnetic clutch 12. The second input shaft 13a of the planetary gear mechanism 13 located is connected.

This planetary gear mechanism 13 has a second input shaft 13a.
The sun gear 13b connected to the lower end and the sun gear 13b
Three planetary gears 13c that are positioned around b, mesh with them, and are rotatably supported by the output shaft 13d located on the lower surface side, and tooth portions formed on the inner peripheral surface of these planetary gears 13c. And an internal gear 13e that meshes with
On the upper surface side of the internal gear 13e, two springs 14 extending in the tangential direction of the outer periphery thereof and constantly urging the internal gear 13e in one rotation direction are arranged point-symmetrically with respect to the center of the internal gear 13e. Further, a sector-shaped slit plate 15 is also connected to the internal gear 13e. The slit plate 15 is formed with a concavo-convex slit 15a continuously on its arc portion.
Two photoelectric sensors 16 are arranged at predetermined positions at the slit 15a so as to cover the slit 15a. The third sprocket 1 is attached to the lower end of the output shaft 13d.
3f is connected.

A speed adjusting unit 7 is arranged in front of the above-mentioned torque detecting unit 6. As shown in FIG. 10, the speed adjusting unit 7 includes the first input shaft 1 of the torque detecting unit 6.
It has a rotatable first shaft 17 located in front of the first input shaft 10 with an axis line 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 thereof. Each is integrally rotatably supported. Below the first shaft 17, a transmission shaft 20 having an axis intersecting with the first shaft 17.
Are rotatably supported by a support base 3d arranged on the loading base 3, and the first end of the transmission shaft 20 is
Bevel gear 1 of the same shape that meshes with bevel gear 19 of shaft 17
9 is fixed rotatably integrally, and a one-way clutch 21 that transmits rotation in only one direction is connected to the other end.

A second shaft 22 located coaxially with the transmission shaft 20 is connected to the one-way clutch 21, and a powder brake 23 and a first gear 24 are fitted and fixed to the second shaft 22, respectively. There is. The powder brake 23 is the support base 3
An outer ring 23a fixed to d, an inner ring (not shown) located inside the outer ring 23a, and a powder chamber (not shown) whose volume is changed by a magnetic force by being enclosed in a powder chamber provided between the outer ring 23a and the inner ring And the powder of. The inner ring of the powder brake 23 is rotatably fixed to the second shaft 22 integrally with the second shaft 22.
Inner ring and outer ring 23a due to volume change of powder in
The rotational speed of the second shaft 22 can be controlled by the frictional resistance generated between and.

The second shaft 2 is provided diagonally below and in front of the second shaft 22.
A second gear 25 having an axis parallel to the second axis 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. The third shaft 27 is disposed, and the third shaft 27 has an axis parallel to the axis of the third shaft 27 diagonally above and in front of the third shaft 27. The third shaft 27 meshes with the third gear 26 of the third shaft 27. A fourth shaft 30 is provided in which the fourth gear 28 and a sprocket 29 that meshes with the guide chain 2d in the frame 2 are integrally rotatably fixed. The sprocket 29 meshes with a guide chain 2d which is arranged on the frame 2 so as to extend in a direction perpendicular to the back plate 2c.

The speed detector 8 is arranged on an extension of the axis of the fourth shaft 30 in the speed adjuster 7. As shown in FIGS. 1 and 2, the speed detector 8 is provided with the frame 2
A rack 2e, which is an example of a guide member extending vertically to the back plate 2c, a detection shaft 31 which is coaxial with the fourth shaft 30 and whose both ends are rotatably supported, and this detection shaft. A disk-shaped slit disk 32, which is an example of a pulse generation unit that is rotatably inserted into and integrally fixed to 31, and a rack 2e, which is also rotatably inserted and fixed to the detection shaft 31 integrally like the slit disk 32. The pinion gear 33, which is an example of a rotating portion that meshes with the, and the two photoelectric sensors 34, which are an example of a pulse detecting portion arranged at a predetermined interval on the circumferential portion of the slit disk 32. A concave-convex slit 32a is formed on the entire circumference of the slit disk 32 of the speed detector 8.

A chuck unit 5 is arranged in front of the mounting table 3. As shown in FIG. 13, the chuck unit 5 has a shape that protrudes above and below the loading table.
It has a pedestal 35 attached to the upper surface, and a cylindrical bearing case 36 that hangs down the loading platform 3 is connected to the lower surface of this pedestal 35. A cylindrical rotation transmission sleeve 37 is rotatably disposed inside the bearing case 36 via a bearing, and a fifth sprocket 38 is integrally rotatably fixed to the lower end of the rotation transmission sleeve 37. A cylindrical relay sleeve 39 is screwed into the upper end so as to rotate integrally. Further, a cylindrical guide sleeve 40 is fixed to the upper surface of the relay sleeve 39, a spring 5a is fitted around the outer periphery of the guide sleeve 40, and is constantly urged upward by the spring 5a. A cylindrical slide sleeve 41 is inserted.

In the vicinity of the tip of the guide sleeve 40,
Through holes 40a penetrating from the outer circumference to the inner circumference are provided at three places so as to divide the circumference into three parts.
A steel ball 42 is operably housed in each. Further, a disk-shaped stopper 4 having a hole having the same diameter as the inner diameter of the guide sleeve 40 at the center is formed at the tip of the guide sleeve 40.
0b is provided so as to project in the outer peripheral direction. Further, the inner peripheral surface of the slide sleeve 41 has an inner hole having a diameter slightly larger than the outer peripheral surface of the guide sleeve 40 formed from the lower surface, and an inner hole having a larger diameter formed continuously above the inner hole. Is formed on the stepped inner peripheral surface of the guide sleeve 40. By sliding the slide sleeve 41 downward along the outer periphery of the guide sleeve 40, the steel ball 42 located in the through hole 40a of the guide sleeve 40 is removed from the through hole 40a. In addition to being configured to operate so as not to fall out, a groove 41a is vertically cut inward on the lower surface side,
The head of a stopper screw 40c screwed into the outer circumference of the guide sleeve 40 engages with the groove 41a, and the guide sleeve 40 is rotated by rotating the slide sleeve 41.
Is also configured to rotate together.

A penetrating rod 43 is integrally rotatably held by the chuck unit 5. This penetration rod 4
Reference numeral 3 is 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 thereof. In this embodiment, this penetrating member 44 is JI.
It is manufactured based on the S type A1221 Swedish-type sounding test method, and the spiral-shaped spiral groove 44a is formed over the entire length of the outer peripheral surface of the substantially cone-shaped penetrating body 44 having a total length of 200 mm. An adapter 45 having a total length of 250 mm and made of a shaft material having the same diameter as that of the penetration rod 43 is screwed and coupled to the upper part of the penetration rod 43, and the outer periphery of the adapter 45 is divided into three equal parts to form a locking groove 45a. The guide balls 40 of the guide sleeve 40 are configured so that they can be fitted to each other, and a male screw 45b is formed on the upper end of the adapter 45 so that another penetration rod 43 can be formed.
Are configured to be connectable.

On the other hand, a cable (not shown) for extracting each speed information is connected to the speed detecting unit 8 and the speed adjusting unit 7, and this cable is connected to the control unit 9. The control unit 9 is configured to process the ascending / descending speed information of the loading platform 3 sent from the speed detecting unit 8 and send an operation command signal to the speed adjusting 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 also provided with a printer 9a so that necessary data at the time of a penetration test can be output.

As shown in FIG. 3, a drive chain 46 is wound around each sprocket 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. It is rotated so that the rotational drive of the drive source section 4 is reliably transmitted to each section, and the torque detection section 6 and the third sprocket 13f in the chuck unit 5 are
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 detection unit 6 is chucked. It is configured to be transmitted to the unit 5.

In the automatic penetration testing machine 1 of the present invention having the above-mentioned structure, the loading table 3 is lowered, and the penetration source 44 is rotated by the driving of the drive source section 4 to penetrate into the ground,
While detecting the load torque value that the penetrating body receives in the ground, the penetrating speed of the penetrating body 44, that is, the descending speed of the loading platform 3 is strictly controlled to always perform stable penetrating of the penetrating body 44, and it is extremely accurate. This is to carry out a penetration test. In order to make this clearer, the operation of the automatic penetration tester 1 will be described in detail below.

First, the chuck unit 5 is inserted into the penetrating rod 4
Insert 3 from below and hold. The penetrating rod 43 used at this stage is one in which the penetrating body 44 is connected to the tip. When holding the penetrating rod 43, first, the slide sleeve 41 in the chuck unit 5 is moved downward along the guide sleeve 40. By pulling down, the steel ball 42 is made operable in the through hole 40a with the stepped shape of the inner peripheral surface of the slide sleeve 41, then the penetration rod 43 is inserted into the guide sleeve 40, and the vicinity of the upper end of the adapter 45 is inserted into the guide sleeve 40. When the penetrating rod 43 is rotated while being positioned and the slide sleeve 41 is opened, the steel ball 42 and the locking groove 45a of the adapter 45 are engaged with each other, and the slide sleeve 41 is moved upward by the force of the spring 5a accordingly. Then, the through hole 40a of the guide sleeve 40 is covered with the inner peripheral surface of the guide sleeve 40, and the steel ball 42 is made inoperable to keep the penetration rod 43 in place. It is carried out.

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

On the other hand, the drive of the motor 4 is transmitted to the second sprocket 11 and simultaneously to the fourth sprocket 18. The drive of the motor 4 transmitted to the fourth sprocket 18 starts the rotation of the first shaft 17, and the rotation of the first shaft 17 is transmitted to the transmission shaft 20 by the bevel gear 19. At this time, the rotation of the first shaft 17 is transmitted to the transmission shaft 20. Since the rotation direction transmitted is the direction in which rotation cannot be transmitted by the one-way clutch 21, the rotation is not transmitted to parts such as the powder brake 23 connected to the transmission shaft 20 via the one-way clutch 21. .

In this way, in the state where the drive of the motor 4 cannot be transmitted midway, the tip of the penetrating body 44 is grounded on the ground surface and stands by. At this time, the powder brake 23
Is applied with a voltage that produces the maximum braking force, and this braking force reaches 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. The loading platform 3 cannot be lowered because it stops at. In this state, the control unit 9 outputs a voltage load command 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 is weakened. 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 due to its weight.

Since the braking force of the powder brake is weakened, the weight of the loading platform acts on the penetrating body 44 as a load, and as a result, the penetrating body 44 sinks into the ground. However,
At this time, the sprocket 29 is attached to the second shaft 22 and the third shaft 2.
7. Since the braking force of the powder brake 23 transmitted by each gear of the fourth shaft 30 is received, the penetrating body 44 does not have the load of 100 kgf, which is the weight of the loading platform 3, but 50
A load equivalent to kgf acts, and the penetrating body 44 is
It will stop when it reaches a depth where it can sink with a load of 0 kgf.

When the sinking of the penetrating body 44 is stopped, the voltage applied to the powder brake 23 changes again. At this time, the voltage applied to the powder brake 23 is
It is a voltage generated by the powder brake 23 that produces a braking force corresponding to a load of 75 kgf. The change in this voltage causes the penetrating body 44 to sink further into the ground, resulting in 75 kgf.
It stops when it reaches a depth where it can sink with the load of f.

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

As described above, while the braking force of the powder brake 23 is changed in three steps and the penetrating body 44 is submerged in the ground, the pinion gear 33 of the speed detecting section 8 causes the pinion gear 33 of the frame 2 to move as the loading platform 3 descends. Since it rotates and moves along the rack 2e, the detection shaft 31 and the slit disc 32 also rotate, and the rotation of the slit disc 32 causes the photoelectric sensor 34 to detect a pulse. This detection pulse is converted into the penetration amount of the penetrating body in the control unit 9, and based on this, the penetration speed for each predetermined penetration amount from the time per unit pulse number measured by a timer (not shown) in the control unit 9 Is calculated.

When the sinking of the penetrating body 44 is stopped by the load of 100 kgf, the electromagnetic clutch 12 in the torque detecting section 6 is stopped.
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 / here
After the speed is reduced to 4, the output shaft 13d outputs 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 provided.
9, the guide sleeve 40 and the slide sleeve 41 start rotating. Along with this, the chuck unit 5
The penetrating rod 43 held at the position also starts to rotate, and the penetrating body 44 stopped in the ground starts to penetrate into the ground again by rotating.

When the penetrating body 44 starts to penetrate into the ground while rotating, a rotating load torque from the soil acts on the penetrating body 44, and this rotating load torque is transmitted from the penetrating rod 43 to the chuck unit 5 and further. The transmission chain 48 extends to the planetary gear mechanism 13. At this time, since the internal gear 13e in 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 according to 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.

Further, 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 the pulse from the slit disk 32 in the control section 9. The penetration speed for each predetermined penetration amount is continuously calculated from the time per unit pulse number, and the number of rotations of the penetrating body 44 during the predetermined penetration amount is also calculated from the time per unit pulse number. . The above-mentioned torque value measurement is performed for each predetermined penetration amount.

When the penetrating body 44 penetrates into the ground by the rotational force, when the penetrating speed exceeds a predetermined value, the electromagnetic clutch 12 is disengaged, and the rotation transmission from the motor 4 to the planetary gear mechanism 13 is cut off. 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 by the loading platform 3 on the penetrating body 44 is 75 kgf. If the sinking of the penetrating body 44 is not stopped by this, 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 becomes 50 kgf. Penetration body 4
When the sinking of No. 4 is stopped, the penetration of the penetration body 44 is performed again from the above-described penetration operation that does not rotate the penetration body 44. When the penetration speed of the penetrating body 44 becomes slower than a predetermined value,
The penetration of the penetration body 44 is stopped at that position, and a buzzer (not shown) is activated.

The penetration test using the automatic penetration tester 1 is carried out up to about 15 m in the ground. Therefore, during the penetration test, the penetration rod 43 must be extended several times to extend the penetration rod 43. When the loading platform 3 reaches the preset bottom dead center during the penetration work, the operation of the automatic penetration tester 1 is stopped at that position first.

After that, a new penetrating rod 43 is screwed into the upper end of the penetrating rod 43 held by the chuck unit 5, the slide sleeve 41 of the chuck unit 5 is lowered along the guide sleeve 40, and about 30 °.
The slide sleeve 40 is rotated. By rotating the slide sleeve 41, the stopper screw 40c of the guide sleeve 40 is moved to the groove 41a of the slide sleeve 41.
Since the guide sleeve 40 also rotates because it is engaged with, the steel ball 42 fitted in the locking groove 45a of the adapter 45 is disengaged from the locking groove 45a and the adapter 45
The non-molded outer peripheral surface of the locking groove 45a is abutted.
In this state, the steel balls 42 project from the outer peripheral surface of the guide sleeve 40 as shown in FIG. 14, and the stepped inner peripheral surface of the slide sleeve 41 is locked to the projecting portion of the steel balls 42. Therefore, even if the force pulling the slide sleeve 41 downward is released, the slide sleeve 41 stops at that position.

Subsequently, when the motor 4 is driven in the direction opposite to that in the original penetration test, this rotation causes the first sprocket 4b,
It 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 motor 4 is driven in the reverse direction, 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 rotated. Rotate along the guide chain 2d. This makes the loading platform 3
Starts climbing 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.
Further, at the same time when the lifting of the loading platform 3 is stopped, the drive of the motor 4 is switched to the normal drive, and at the same time, the electromagnetic clutch 12 is activated to transmit the drive of the motor 4 to the chuck unit 5.

As a result, the chuck unit 5 rotates, the steel ball 42 fits into the locking groove 45a of the adapter 45 as the chuck unit 5 rotates, and the slide sleeve 41 moves upward by the spring force. The inner peripheral surface covers the through hole 40a of the guide sleeve 40, seals the operation of the steel ball 42, and completes the connection of the new penetrating rod 43.
The subsequent penetration test is continued from the state before the addition of the penetration rod 43, and the penetration rod 43 is repeatedly added, and when the penetration body 44 reaches the target penetration amount, the penetration test is terminated at that time.

While the work of adding the penetrating rod 43 is being performed, the printer 9a of the controller 9 outputs the test data up to that point. This test data summarizes the torque value at a predetermined penetration amount, the number of rotations of the penetration member 44 between the predetermined penetration amounts, and the number of rotations of the penetration member 44 per 1 m calculated from the number of rotations of the penetration member 44 between the predetermined penetration amounts. The data is output in a table format, and after the penetration test is completed, the operator determines the soil quality at the specified penetration amount from these data.

[0043]

As described above, the automatic penetration tester, the construction and operation of which are described in detail, includes a pinion gear meshing with a rack arranged on the rear surface of the frame, and a detection shaft rotatably arranged on the loading table for pivotally supporting the pinion gear. And a slit disc that is rotatably arranged integrally with the detection shaft and has a slit formed in the outer periphery, and a pulse that is located near the outer periphery of the slit disc and that is obtained from the slit by rotation of the slit disc. Since the sensor has a speed detecting unit including a sensor for detecting a signal, by setting the penetration amount per pulse, the descending speed of the loading platform, that is, the amount of pulses detected per unit time by the sensor, that is, It is possible to know the penetration speed of the intrusive body, and it becomes possible to accurately determine the self-precipitation of the intrusive body by setting a constant reference pulse number,
There is an effect that the reliability of soil quality judgment can be improved. In addition, since the pulse obtained from the rotation of the slit disk is used as the signal for detecting the penetration speed, it is possible to automate the self-sinking judgment by providing a control unit like this automatic penetration tester, which allows Moreover, it becomes possible to accurately and promptly determine the self-sinking of the penetrating body.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of an essential part of a speed detection unit 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 table in the automatic penetration tester according to the present invention.

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

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

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

FIG. 9 is an enlarged side view showing 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 detection unit in the automatic penetration tester according to the present invention.

12 is a cross-sectional view taken along the line AA of FIG.

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

FIG. 14 is an enlarged cross-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]

 1 Automatic Penetration Testing Machine 2 Frame 3 Loading Platform 3c Weight 4 Drive Source Section (Motor) 5 Chuck Unit 6 Torque Detection Section 7 Speed Adjustment Section 8 Speed Detection Section 9 Control Section 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 Sliding sleeve 42 Steel ball 43 Penetration rod 44 Penetration body 45 Adapter 45a Locking groove 46 Drive chain 48 Transmission chain

Claims (2)

[Claims] 1. A vertically movable loading platform is arranged along a frame, and a rotatable chuck unit is mounted on the loading platform.
A drive source portion for rotationally driving the chuck unit, and detachable weights of various weights for adjusting the weight of the loading platform are arranged, and the chuck unit holds a penetrating rod having a penetrating body connected to the tip thereof to hold the weight. In the automatic penetration tester for penetrating the penetrating body into the ground by driving the weight and the driving source part, a speed detecting part for detecting the ascending / descending speed of the loading platform is provided across the frame and the loading platform, while the velocity detecting part is provided. An automatic penetration tester, which is provided with a control unit for processing signals from the. 2. The speed detecting unit is arranged so as to extend in a direction perpendicular to the frame, and is arranged on the loading platform so as to rotate along the guiding member as the loading platform moves up and down without causing slippage. And a pulse generator that rotates integrally with the rotor and replaces the rotation with a pulse, and a pulse detector that detects a pulse from the pulse generator and sends it to the controller. The automatic penetration tester according to claim 1.