JP2011163010A - Air cylinder type foundation strength investigation machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air cylinder type foundation strength investigation machine which can investigate accurate foundation strength by inhibiting a penetration body from rapidly self-settling into a soft layer of ground. <P>SOLUTION: This swedish-weight-sounding air-cylinder type foundation strength investigation machine 10 digitally controls a variation in the self-settlement of the penetration body by means of an air cylinder 44. The foundation strength investigation machine 10 includes: a loading elevating platform 23 which comprises the penetration body 30 perpendicularly thrusting a leading end of a penetration rod 31 into the ground, a rotary device for rotating the penetration body, and a weighting means for weighting the penetration rod; an air cylinder type elevating mechanism for lifting/lowering the loading elevating platform; and a measuring device for measuring the penetration depth of the penetration rod and the number of the rotations of the penetration rod. The weighting means makes a direction of an upward thrust by air pressure of the air cylinder face a direction of a downward thrust by an applied weight load 22, so that a difference between the thrusts can make the penetration body self-settle and ascend/descend. A constitution, which performs sequence control of a digital regulator, is employed for the control of the air pressure. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air cylinder type ground strength investigation machine capable of preventing rapid self-sedimentation of an intruder in a soft ground layer and capable of accurately examining ground strength.

  In the conventional ground strength surveying machine based on the Swedish sounding method, it is common to use a weight load or a hydraulic method for the penetration mechanism of the penetrating body.

  In the Swedish sounding tester using the above weight load (Japanese Industrial Standard JIS A1221), a screw point like a conical twist is attached to the tip of an iron rod (penetrating rod), and it is pushed vertically to the ground. Along with this, the weight is placed on the penetrating rod and rotated while it is penetrating into the ground, and the strength of the geological layer is determined while measuring the rotational speed of the screw point relative to the ground and the amount of penetrating rod penetrating, Since the work of placing a weight load on the penetrating rod and the work of rotating the penetrating rod are manual work by human power, a large amount of labor and man-hours are required.

  In addition, the Swedish sounding tester using a hydraulic system is, for example, a `` penetration test device '' (see Patent Document 1) that attempts to increase work efficiency by operating a hydraulic cylinder for each work associated with ground strength investigation. A "ground survey device, ground survey method, and ground improvement method" has been proposed (see Patent Document 2). The proposal converts the load load and release means into the fluid pressure of the hydraulic cylinder to increase and decrease the pressure. By adopting this method, the work of replacing the weight load is omitted, but because the load load is not the absolute load due to the weight load but the conversion weight converted by the fluid pressure, operation errors and reading errors are likely to occur. In addition, the apparatus tends to be large, and the introduction price and maintenance cost tend to be high.

  In addition, the method of penetrating the penetrating body with a hydraulic cylinder measures the load load with the hydraulic valve closed and stopped during rapid self-sink, and the sudden stop state of the penetrating rod at that time is measured visually. Doing so tends to cause errors in measured values.

  In addition, in the “electromagnetic powder type ground investigation device” (see Patent Document 3), in which the electromagnetic powder brake is applied to the lowered state and the weight load is not required to be changed (see Patent Document 3), the brake value changes due to moisture, the electromagnetic powder brake There are problems such as the occurrence of numerical errors due to aging, the need for warming up before operation, and the instability of the brake value at low rotation, and it is necessary to calibrate the load weight to calibrate them. Due to the structure of the device, it was not easy to calibrate the load weight value immediately.

  As described above, none of the above proposals requires a hand gap to replace the weight load, or lacks the accuracy and responsiveness of the measured value.In addition, the penetration of the intruder in the soft layer of the stratified structure of the ground It was not a ground strength survey machine that facilitated the work of changing the weight load corresponding to self-sink.

In addition, the conventional testing machine using the Swedish sounding method uses an air cylinder or hydraulic cylinder to set the downward load by operating the load weight from above, including the weight load. When it penetrates into the soft layer, time log and clearance are slightly generated in the measured value and penetration amount.

  Therefore, the present inventor does not use the force obtained by the hydraulic cylinder or the air cylinder downward, but sets the downward load with a weight load so that the total weight is 100 kgf, and then sets the air pressure of the air cylinder. If the downward load adjusted by the upward thrust force is applied, the measured value and penetration amount are less likely to cause time log and clearance, and the upward air pressure by the air cylinder is always applied with a weight load of 100 Kgf. Therefore, the present invention has been achieved from an unprecedented point of view, focusing on the possibility of eliminating the poor response at the time of start and end peculiar to the air cylinder.

  In order to clarify the meaning of the term, the downward force adjusted by the air pressure is called “weight”, and the downward force due to the weight and the weight of the device not adjusted by the air pressure is called “load”. The state of lowering regardless of rotation is called “sinking”, the state of lowering due to the rotation and load of the rod is called “penetration”, and the state of lowering by weight without rotating the rod is called “self-sinking”.

JP-A-10-121453 JP 2008-115685 A JP-A-8-74240

  In view of the above problems, the present invention aims to provide an air cylinder type ground strength surveying machine capable of preventing rapid self-sedimentation of the penetrating body in a soft ground layer and capable of accurately surveying ground strength.

  The present invention is made in order to achieve the above object, and is a Swedish sounding type air cylinder type ground strength investigation machine that digitally controls the amount of self-sinking change of the penetrating body using an air cylinder, and the tip of the penetrating rod A penetrating body that projects a screw point at a right angle with respect to the ground, a rotating device that rotates the penetrating body through a transmission mechanism, and a weighting unit that applies a weight to the penetrating rod and penetrates the screw point into the ground. A loading elevator, an air cylinder type lifting mechanism for raising and lowering the loading elevator, and a measuring device for measuring the penetration depth and the number of rotations of the penetration rod. The upward thrust direction due to the air pressure of the air cylinder is opposed to the thrust direction of the air cylinder, and the penetrating body depends on the thrust difference And means for scuttled and lifting, and employs a configuration that sequence controls the digital regulator control the air pressure.

  According to the air cylinder type ground strength investigation machine according to the present invention, the downward load is set with a weight of 100 Kgf, and the downward load is adjusted by the upward thrust with the air pressure of the air cylinder. It has a structure in which time log and clearance do not easily occur in the amount of self-sink, and since upward air pressure is applied by the air cylinder with a weight load of 100 kgf always applied, the air cylinder has its own starting and stopping There is an excellent effect that can eliminate the poor response.

  According to the air cylinder type ground strength investigation machine according to the present invention, the air cylinder is controlled by a digital regulator (air pressure regulator), so that it can be used as a brake mechanism corresponding to a sudden self-sink of the penetrating body during the ground investigation work. There is an excellent effect that can be achieved.

  Further, according to the air cylinder type ground strength investigation machine according to the present invention, the digital regulator can always maintain a constant pressure regardless of the differential behavior of the air cylinder, so that it can be maintained at a preset instruction pressure. An excellent effect is achieved in that a thrust is applied to the air cylinder, and the load weight can be easily adjusted during rapid self-sink during penetration.

  In addition, according to the air cylinder type ground strength investigation machine according to the present invention, the combination of the wire type digital distance meter and the digital rotation speed reading device can accurately detect the clearance of sudden self-sinking change and supply / There is an excellent effect that can be stopped.

  Moreover, according to the air cylinder type ground strength investigation machine which concerns on this invention, after raising air pressure rapidly, there exists an outstanding effect which can adjust the load which makes it self-sink, changing the thrust of an air cylinder in steps.

  In addition, according to the air cylinder type ground strength investigation machine according to the present invention, at the time of calibration, a load meter is placed at the tip of the rod, and the thrust of the air cylinder is input as a digital signal, and the difference from the set value is determined each time. The digital input value can be changed.

  In addition, according to the air cylinder type ground strength survey machine according to the present invention, compared to conventional cylinder type and electromagnetic powder brake type ground strength survey machines, it is excellent in suppressing the cost of introduction and maintenance costs. There is an effect.

It is a mimetic diagram showing the whole air cylinder type ground strength investigation machine concerning the present invention. It is a conceptual explanatory drawing which shows the basic relationship of the penetration amount and weighting of the penetration body which concerns on this invention. It is a graph which shows the rotation speed of the penetration rod which concerns on this invention, and the degree of penetration depth. It is the conversion table which shows the thrust of the air cylinder which concerns on this invention, and the calculation formula of the amount of self-sink. It is a flowchart figure which shows the basic use condition which concerns on this invention. It is a flowchart figure (continuation) which shows the basic use condition which concerns on this invention. It is a flowchart figure (continuation) which shows the basic use condition which concerns on this invention. It is explanatory drawing which showed the specific example of the relationship between the penetration amount and the weight of the penetration body which concerns on this invention. It is explanatory drawing which showed the specific example of the relationship between the penetration amount and the weight of the penetration body which concerns on this invention. It is explanatory drawing which showed the outline of the control system which concerns on this invention.

  The present invention is a Swedish sounding type air cylinder type ground strength investigation machine that digitally controls the amount of self-sinking change of an intruding body using an air cylinder, in a downward thrust direction due to a loaded weight load on a weighting means. In contrast, the upward thrust direction due to the air pressure of the air cylinder is made to oppose, and the penetrating and lowering of the penetrating body is caused by the difference in thrust, and the digital regulator sequence control is adopted for the air pressure control. It is the feature of. DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.

  FIG. 1 is a schematic view showing the entire air cylinder type ground strength surveying machine according to the present invention, and FIG. 1 (a) is a schematic view showing a state where the penetrating body is raised. The air cylinder type ground strength surveying machine 10 according to the present invention has a penetrating body 30, a loading platform 23, a lifting mechanism D, and a measuring device E mounted on a rectangular base 20 with traveling wheels. The control panel box 54 performs sequence control and is connected to an external compressed air generator K (compressor).

  FIG.1 (b) is a schematic diagram which shows the state which the penetration body fell. In the operation of the air cylinder type ground strength investigation machine 10 according to the present invention, a prescribed weight load 22 is loaded on the loading platform 23, and the thrust of the air cylinder 44 is gradually lowered to allow the penetrating body 30 to penetrate into the ground. When the self-sinking of the penetrating body 30 stops, the rotary motor 40 is driven, and the penetrating body 30 is penetrated into the ground to record the ground strength while recording various sampling data. Here, when the formation layer T of the ground G is formed as a soft layer in the middle of this work, the penetration speed of the penetration body 30 is rapidly increased, and the penetration body 30 is grounded regardless of the rotation of the penetration rod 31. There may be a phenomenon called self-settling that sinks suddenly. In the present invention, even when such a phenomenon of self-sink occurs, the rotation of the penetrating body 30 is temporarily stopped, the downward load is adjusted by the air cylinder 44, and the penetrating speed of the penetrating body 30 is measured again to determine the ground. It is possible to investigate.

  The penetrating body 30 is formed by attaching a screw point 32 like a conical twist to the tip of the penetrating rod 31, and the penetrating rod 31 has a length of approximately 75 cm and is used on the loading platform 23. It is held by a clamp chuck 33 provided, rotated by a rotating device B via a transmission mechanism A, and moved up and down by a lifting mechanism D.

  The rotation device B is provided in the loading platform 23 and is constituted by a rotation motor 40 and a transmission mechanism A. The rotation of the rotation motor 40 is transmitted to a penetrating rod 31 that is transmitted by a gear or a chain 41 and is held by a clamp chuck 33. It has a structure that rotates by transmission. The specification of the rotary motor 40 may be, for example, one driven by AC 100 V, 200 W, shaft torque 70.6 N · m, 22.5 rpm.

  The weighting device C is determined by the weight load 22 provided on the loading platform 23 and the brake pressure by the air cylinder pressure. In the case of the weight load 22, several weight loads 22 of 12.5 Kgf are mounted. Then, the weight of the loading platform 23 is added to this and tested so as to obtain a load of 100 Kgf.

  In addition, the air cylinder type ground strength investigation machine according to the present invention has a structure in which the penetration load is determined by the difference between the weight of the weight load 22 and the brake pressure due to the air cylinder pressure at the value shown in FIG. Have. The cylinder diameter of the air cylinder 44 is not limited to 100φ and may have a capacity exceeding 0.255 MPa, but considering the operation response and safety, it has a capacity of about 0.3 MPa or more. It is desirable.

  The air cylinder pressure can be calibrated by placing a load meter at the tip of the penetrating rod 31, inputting the air pressure as a digital signal, determining the error from the set value each time, and changing the digital input value. it can.

  The air cylinder 44 is erected in parallel with the guide column 42, and is provided with a sprocket 46, a pulley, and the like at the tip thereof. The air cylinder 44 is lowered by the action of a folded roller chain 45, a cogged belt, and the like. The function is to brake the action and to adjust the penetration load. The compressed air used is supplied from a compressor K outside the machine.

  The elevating mechanism D is installed at the approximate center on the rectangular base 20 with the traveling wheels, and the guide roller 43 in the loading elevating base 23 rotates to raise and lower the guide column 42. The penetration load is a weight load. The ascending action is performed by connecting a chain 45 to one end of the loading elevator 23 and turning back via a sprocket 46 provided at the tip of an air cylinder 44 standing in parallel. The air cylinder 44 is lifted by a thrust applied to the air cylinder 44 so as to brake the descending action of the loading platform 23 and adjust the penetration load.

  The manual brake device 47 is provided as a safety device when the weight load 22 or the penetrating rod 31 is replaced or when a measured value is confirmed. The manual brake device 47 is a manual brake device that is operated by the rotation of the cam and the lever of the hand pushing lever. The loading elevator 23 is fixed by being brought into pressure contact with the guide column 42.

  The digital regulator 50 operates a solenoid valve or the like by an electrical signal from a controller or the like, and adjusts the high pressure air supplied from the compressor K or the like and the exhaust from the exhaust hole 58, so that the designated air pressure is always supplied to the air cylinder 44. It is possible to supply stably. The digital regulator 50 is not particularly limited, and a general digital electro-pneumatic regulator may be used. However, the specification has a pressure range of at least about 0 to 0.5 MPa, and has anti-pressure characteristics and responsiveness. It goes without saying that it is better to use the excellent one. In FIG. 10, the pressure display is displayed on the operation panel 54, but may be displayed on the digital regulator 50.

  The measuring device E is provided on the loading platform 23 and measures the rotational speed of the penetrating rod 31 and measures the penetrating amount of the penetrating rod 31. The rotational speed of the penetrating rod 31 is measured by the non-contact digital rotational speed reading device 51 to detect the rotational speed of the gear of the transmission mechanism A that rotates the penetrating rod 31 and the speed of the chain 41. The penetration amount of the penetration rod 31 is measured by fixing one end of the wire type digital distance meter 52 to the loading elevator 23 and fixing the other end to the base 20 to determine the distance between the loading elevator 23 and the base 20. Is displayed on the control panel box 54.

  The control panel box 54 includes an instrument panel for displaying the pressure value of the digital regulator 50, a numerical value input button 55 for inputting the input value, an instrument panel for displaying the rotational speed of the digital rotational speed reader 51, and a wire type digital distance meter 52. Instrument panel that displays the amount of movement, pressure adjustment volume 56, select switch 57 that supports weighting, power switch, emergency stop switch, and other indicators necessary for operation of the air cylinder type ground strength surveying machine according to the present invention A switch or the like is provided. For sequence control, a programmable logic controller (abbreviated as PLC) or a sequencer (registered trademark), which is a control device using a dedicated microcomputer, is used to express control contents in advance by a program. . It is also desirable to provide a keyboard on the control panel so that direct input is possible.

FIG. 2 is a conceptual explanatory view showing the basic relationship between the penetration amount of the penetrating body of the present invention and the weight of the air cylinder.
(1) At the start, a pressure of 0.318 MPa (125 Kgf upward thrust) is applied to the air cylinder 44 with respect to the penetrating body 30 with a total weight of 100 kgf to raise the penetrating body 30.
(2) Next, the pressure value is set to 0.255 MPa at the top, the thrust of the air cylinder 44 is set to 100 Kgf, and the penetrating body 30 is slowly lowered slightly to be grounded.
(3) Thereafter, the thrust of the air cylinder is set to 85 kgf, and it is visually confirmed whether the penetrating body 30 is lowered by its own weight and is self-sinking in the ground G, and the distance is recorded by the wire type digital distance meter 52.
(4) If natural self-settlement does not occur, record and observe the self-sedimentation of the penetrating rod on the ground by setting the thrust of the air cylinder to 75 kgf.
(5) If there is no further natural settling, record and observe the settling of the penetrating rod on the ground with an air cylinder thrust of 50 kgf.
(6) If further self-settlement does not occur, record and observe the self-sink of the penetrating rod on the ground with the thrust of the air cylinder set to “25”.
(7) If natural self-sink does not occur, set the thrust of the air cylinder to “0” and record and observe the self-sink of the penetrating rod on the ground.
(8) The rotary motor 40 is operated in a state where it does not spontaneously settle, and the penetration rod 31 is rotated to measure and record the number of revolutions of the penetration rod 31 per penetration depth of 25 cm.
(9) When the ground G hits a soft formation during the penetration, the penetration body 30 will be rapidly self-sinking.
(10) Simultaneously with stopping the motor rotation, a signal in which the thrust of the air cylinder is set to 100 Kgf is transmitted to the digital regulator 50 to stop the self-sinking of the penetrating body 30.
(11) After that, while observing the penetration speed, the thrust was 85 kgf / 75.
Gradually lower it to Kgf, 50 Kgf, 25 Kgf, and adjust until the self-sinking of the penetrating rod disappears.
(12) When the thrust of the air cylinder is no longer self-sinking in the state of “0”, the penetration rod 31 is rotated and the number of revolutions of the penetration rod 31 per penetration depth of 25 cm is measured and recorded.

  FIG. 3 is a graph showing the number of revolutions and the depth of penetration of the penetration rod of the present invention. When all the weight loads 22 are loaded, the total weight of the loading platform 23 becomes 100 Kgf. However, when the penetrating rod 31 is not settled at that time and is stationary, the penetrating rod 31 is rotated to rotate the tip. The penetration rod 31 is forced to penetrate the ground G while digging the ground G at the screw point 32, and the number of rotations of the penetration rod 31 to record the penetration rod 31 by 25 cm is recorded. The measurement is terminated when recording to the specified penetration depth is completed, and the penetration rod 31 is pulled out to finish the ground investigation.

  FIG. 4 is a conversion table showing the thrust of the air cylinder in the present invention and a formula for calculating the amount of self-sink. FIG. 4A shows the pressure value of the air cylinder. This shows the relationship between air pressure (MPa) and thrust (Kgf) with respect to the pressure diameter 100φ of the air cylinder 44. The penetrating body 30 has a weight of 100 Kgf in total with the weight load 22, and the air cylinder thrust (Kgf ) Is the thrust (Kgf) applied to the cylinder rod by the difference from the thrust (Kgf) of the indicated air pressure (MPa).

  FIG. 4B shows a formula for calculating the self-sedimentation rate. The amount of self-sediment is determined by the ratio of C / N, and when C / N becomes larger than a predetermined value, self-sediment stop processing is taken. N is the rotational speed of the rod, and C is the descending distance of the rod.

FIG. 5 is a flowchart showing a use state in the present invention. The operation is performed by sequence control or manually.
(1) The compressor K is operated and air is supplied to the air cylinder 44.
(2) Set the pressure value of the digital regulator 50 to “0” and input.
(3) A total weight of 100 kgf is loaded.
(4) Set the pressure value of the digital regulator 50 to “0.318” and input.
(5) The air cylinder 44 operates and the penetrating body 30 rises to the upper end of the guide column 42 and stops.
(6) Open the clamp chuck 33 and attach the penetration rod 31.
(7) Set the pressure value of the digital regulator 50 to “0.255” and input it.
(8) Confirm the grounding position of the penetration lot 31, the pressure of the digital regulator 50, and the loading of the weight load 22 with a total weight of 100 kgf.
(9) When the control panel box 53 is operated, the origin pressure value is “0”.
input.
(10) Set the pressure value of the digital regulator 50 to “0.217” and input.
(11) When self-sinking, measure the C value with the wire type digital distance meter 52 and record it.
(12) Decrease the pressure value of the digital regulator 50 in steps from “0.191” → “0.127” → “0.064” → “0” until the self-sink is confirmed.

FIG. 6 is a flowchart (continuation) showing a use state in the present invention.
(13) When self-sinking, measure the C value with the wire type digital distance meter 52 and record it. When the self-sink does not occur, the rotary motor 40 is operated and the penetration rod 31 is rotated.
(14) The distance through which the penetrating body 30 penetrates due to the rotation of the penetrating rod 31 is measured by the C-type digital distance meter 52 and recorded.
(15) The pressure value “0.255” of the digital regulator 50 is input while the penetrating body 30 is descending, and the C value is measured and recorded by the wire type digital distance meter 52.
(16) When self-sinking, the rotation of the rotary motor 40 is stopped.
-Input the pressure value "0.255" of the digital regulator 50, and measure and record the C value with the wire type digital distance meter 52.
-Input the pressure value "0.217" of the digital regulator 50, and measure and record the C value with the wire type digital distance meter 52.
(17) Decrease the pressure in stages from “0.217” → “0.191” → “0.127” → “0.064” → “0” until the pressure adjustment of the digital regulator 50 is self-settled.

FIG. 7 is a flowchart (continuation) showing a use state in the present invention.
(18) The rotary motor 40 is rotated to rotate the penetration rod 31.
-Input the pressure value "0" of the digital regulator 50, and measure and record the C value with the wire type digital distance meter 52.
(19) The rotational speed and penetration depth of the penetration rod 31 are measured and recorded between the lowest position of the penetration rod 31 length or a distance of 75 cm.
(20) The pressure value “0.217” of the digital regulator 50 is inputted, the rotation motor 40 is stopped, and the rotation of the penetration rod 31 is stopped.
(21) Loosen the clamp chuck 33 and release the penetration rod 31.
(22) Input the pressure value “0.318” of the digital regulator 50.
(23) The penetrating body 30 rises.
(24) The penetration rod 30 is added.
(25) The clamp chuck 33 is fastened and fixed.
(26) When self-sinking, the rotation motor 40 is stopped, and the rotation of the penetration rod 31 is stopped.
(27) Input the pressure value “0.255” of the digital regulator 50.
(28) The pressure value “0.217” of the digital regulator 50 is input, and the C value is measured by the wire type digital distance meter 52 and recorded.
(29) Confirm the amount of self-setting by gradually reducing the pressure adjustment of the digital regulator 50 to “0.217 → 0.191 → 0.127 → 0.064 → 0” until it self-sinks.
(30) When self-sinking, the rotation motor 40 is stopped and the rotation of the penetration rod 31 is stopped.
(31) When the self-sink does not occur, the rotary motor 40 is rotated to rotate the penetration rod 31 and the pressure value “0” of the digital regulator 50 is input.
(32) The rotational speed of the penetrating rod is measured by the digital rotational speed reader 51, and the C value is measured and recorded by the wire type digital distance meter 52.
(33) Repeat this process up to the specified ground depth, measure the location of the survey area, and investigate the strength of the formation.

  8 and 9 are explanatory views showing specific examples of the relationship between the penetration amount of the penetration body 30 and the weight of the air cylinder 44 of the present invention. The basic method of use is as described above, but in FIG. 8, it can be determined that it can be used as the foundation of a building when a soft formation and a strong formation are repeatedly layered. In order to investigate a simple formation, the case where the penetration rod 31 is added and the formation state is investigated is shown.

The penetration rod 31 is installed on the ground surface in (1), the depth of the soft soil layer in (2) is measured, and the distance and hardness of the strong ground layer in the lower layer is measured in (3) to (7). Then, in (8) to (11), the depth of the soft formation in the lower layer is further measured. In (12), the distance and hardness of the strong formation in the lower layer is further measured, and (13) to (13) 22) further measure the depth of the soft layer below it, (23) to (26) measure the distance and hardness of the strong layer below it, and (27) penetrate half turn It can be seen that a solid rock layer is further underneath due to a few over.

  In (6), (20), and (26), the penetration rod 31 is added by the clamp chuck 33.

Next, a manual operation will be described with reference to FIG.
(1) At the start, the pressure of the air cylinder 44 becomes 0.318 MPa by pressing the lift button, and the penetrating body 30 is lifted.
(2) Load the weight so that the total weight becomes 100 kgf.
(3) Operate the air select switch 57 to slightly lower the pressure of the air cylinder 44 to 0.255 MPa.
(4) Sequentially operate the air select switch 57 and measure the depth until the self-sink disappears by gradually decreasing the air pressure in the order of “0.217” → “0.191” → “0.127” → “0.064” → “0”. .
(5) When self-sinking disappears, turn on the rotation switch to allow the penetration rod 31 to penetrate.
(6) Continue measuring distance and rotation.
(7) When the penetrating rod 31 is lowered suddenly, the stop button is pushed. With this operation, regardless of the setting of the air select switch 57, the air pressure of the air cylinder 44 becomes 0.255 MPa, and the weight of the inlet rod 31 becomes 0 kgf.
(8) Sequentially operate the air select switch 57 to gradually decrease the air pressure in the order of “0.217” → “0.191” → “0.127” → “0.064” → “0”, and then settling down and stopping. Measure depth until self-sink disappears.
(9) When the self-sink disappears, turn on the rotation switch again to allow the penetration rod 31 to penetrate.
(10) Measure distance and rotation.

DESCRIPTION OF SYMBOLS 10 Air cylinder type ground strength investigation machine 20 Base 21 Traveling wheel 22 Weight load 23 Loading lift 30 Penetration body
31 Penetration rod
32 Screw point 33 Clamp chuck 40 Rotating motor 41 Gear or chain 42 Guide column 43 Guide roller 44 Air cylinder 45 Chain 46 Sprocket 47 Manual brake 50 Digital regulator 51 Digital rotation number reader 52 Wire type digital distance meter 54 Control panel box 55 Numerical value Input button 56 Pressure adjustment volume 57 Air select switch 58 Exhaust hole A Transmission mechanism B Rotating device C Weighting means D Lifting mechanism E Measuring device K Compressor G Ground T Formation layer

Claims (1)

A Swedish sounding type air cylinder type ground strength investigation machine that digitally controls the amount of self-sinking change of the penetrating body using an air cylinder,
A penetrating body that thrusts the screw point provided at the tip of the penetrating rod perpendicular to the ground; and
A loading elevator comprising a rotating device that rotates the penetrating body through a transmission mechanism, and a weighting unit that applies a weight to the penetrating rod and penetrates the screw point into the ground;
An air cylinder type lifting mechanism for lifting and lowering the loading platform;
A measuring device for measuring the penetration depth and the number of revolutions of the penetration rod,
The weighting means is a means for making the upward thrust direction due to the air pressure of the air cylinder face the downward thrust direction due to the loaded weight load, and for causing the penetration body to self-sink and move up and down by the difference in thrust, An air cylinder type ground strength surveying machine that employs a digital regulator sequence control for pressure control.

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