JPH0752175Y2 - Penetration element automatic detection device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic detecting device for a penetration element (the number of hits and a penetration depth) in a standard penetration test at the time of measuring soil resistance and soil sampling, which is carried out in a basic ground survey.

[0002]

2. Description of the Related Art The applicant of the present application has a prior application as a self-recording device for recording the number of hits and the amount of penetration in a standard penetration test (Practical application No. 86827 in 1988) as a means for proving soil sampling. However, since the invention of the prior application records the number of hits and the depth of penetration as a trace by the impression of the recording pen on the recording paper, the recording pen is pressed against the recording paper even during the impact, In order to leave a trace without damaging the surface, it is necessary to make many improvements in the problem of selecting the shape of the pen tip and the selection of recording paper that matches the selection, or maintaining the recording paper in the rain or snow. there were.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides an automatic detecting device for a penetration element which can detect the number of hits and the penetration depth in a non-contact state using ultrasonic waves.

[0004]

An automatic detecting device for a penetrating element according to the present invention is a boring machine in which a knocking head of a boring rod is detachably attached with an ultrasonic sensor stored in a waterproof protective case. A reflecting plate in the form of an arc plate formed with a predetermined radius of curvature is attached to the main body so as to be vertically adjustable.

[0005]

[Function] Even if the knocking head for mounting the ultrasonic sensor swings to some extent and the position of the sensor fluctuates, the reflection plate uses the distance from the center of the boring rod to the center of the sensor as a reference radius of curvature. Since it has a circular arc plate shape, it can sufficiently correspond to the detection area of the sensor.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Explaining the present invention with reference to an embodiment, as shown in FIGS. 1 and 2, a bisected receiving seat 2 is externally fitted and fixed to the outer peripheral surface of a knocking head 1, and the receiving seat 2 is fixed to the receiving seat 2. A waterproof protective case 4 having an opening at the lower end is attached via a ring-shaped cushioning body 3, and an ultrasonic sensor 5 is housed inside the case 4, and a lower boring machine body 6 is shown in FIG. Such a mounting seat 7 is attached, and the guide shafts 9 are respectively inserted into the through holes 8 vertically passing through the mounting seat 7 at a required interval, and the seat plate 10 formed on the top of the guide shaft 9 is mounted on the seat plate 10. An arc plate-shaped reflector 12 having the center of the bore of the boring rod 11 as the center of attachment to the center of the ultrasonic sensor 5 and having the distance as the reference radius of curvature is detachably attached, Screw holes from the end surface of the mounting seat 7 toward the respective insertion holes 8. 3 through horizontal setting and the said threaded hole 13 made screwed a set screw 14.

The penetrating element automatic detection device a thus constructed is such that the ultrasonic sensor 5 is connected to the control box 15 shown in FIG.
The number of hits and the penetration depth are transmitted to the recording sheet 17 via the recording sheet 6 in a non-contact state.

Prior to the start of recording, in order to adjust the origin position in a predetermined measurement range, the set screw 14 is loosened to move the reflector 12 up and down, the reflector 12 is fixed after correction, and the penetration test is started. .

As shown in FIG. 5, the penetration test is carried out by dropping a boring rod 11 having a sampler 18 joined to the tip thereof and a hammer 19 of a given weight from a given height to the knocking head 1 joined at the upper portion thereof. , The penetration energy into the soil, after the penetration, the foot switch 20 issues a measurement record command, and the ultrasonic sensor 5 detects the distance to the reflector 12 to measure the penetration depth, and a recorder. 17, the penetrating element having the number of hits and the penetration depth is printed on the recording paper each time the hit is made.

The ultrasonic signal transmitted from the ultrasonic sensor 5 at the time of distance detection has a fluctuation range in the detection region to some extent, but the reflector 12 is formed in an arc plate shape exceeding the fluctuation range. Therefore, there are no omissions in detection,
Even if the knocking head 1 to which the ultrasonic sensor 5 is attached swings and the position of the sensor 5 swings with respect to the central position of the reflection plate 12, it can be reliably detected because it has a wide receiving area. Is. Since the ultrasonic sensor 5 is housed in the waterproof protective case 4 and is attached downward, it is not easily affected by disturbances such as rain and snow, and is used for all-weather type, and the shock absorber 3 is used for hammering. Since the control box 15 can be easily carried by the user, and the control box 15 can be carried around, it is possible to create a recording sheet as evidence data in the room in the case of rain, so that there is no fear of damage or damage.

[0011]

[Effects of the Invention] As described above, according to the present invention, since it is possible to perform a penetration test in a non-contact state and in all weathers, it is particularly excellent in terms of service life and availability. Since the maintenance of recorded results is easy,
It also has a ripple effect of being able to secure evidence materials that are not damaged or damaged.

[Brief description of drawings]

FIG. 1 is a view showing a state in which a penetrating element automatic detection device a according to the present invention is mounted.

FIG. 2 is a plan view showing a state where the receiving seat 2 is removed from the knocking head 1.

FIG. 3 is a plan view showing a state where a reflection plate 12 is attached to a mounting seat 7.

FIG. 4 is a diagram illustrating the use of the automatic penetration element detection device a.

FIG. 5 is a usage state diagram of the same device a.

[Explanation of symbols]

 1 knocking head 2 receiving seat 3 buffer 4 waterproof protective case 5 ultrasonic sensor 6 boring machine body 7 mounting seat 8 insertion hole 9 guide shaft 10 seat plate 11 boring rod 12 reflector 14 set screw 15 control box 16 amplifier 17 recorder 18 Sampler 19 Hammer 20 Foot switch a Automatic device for detecting penetration element

Claims (1)

[Scope of utility model registration request] 1. An arc plate-shaped reflecting plate having an ultrasonic sensor housed in a waterproof protective case detachably attached to a knocking head of a boring rod in a boring machine and having a predetermined radius of curvature on the boring machine body. An automatic detection device for penetrating elements that is attached so that it can be adjusted vertically.