JPH0118718Y2 - - Google Patents

Description

[Detailed description of the invention] A. Field of industrial application The invention relates to an inclination orientation display device for ground samples.
In particular, the present invention relates to a ground sample tilt direction display device that is attached near the tip of a ground sample collection device.

B. Conventional technology A variety of ground sampling devices (hereinafter simply referred to as samplers) have been devised and put into practical use for collecting soil and rock samples from deep in the ground without disturbing them, including the piston-type thin wall sampler. ,
It is put into practical use under names such as Dennison type sampler, triple tube sampler, and double core barrel. Among these, the piston-type thin wall sampler is used for relatively soft ground, and is equipped with a piston to prevent the sample from falling out. The Dennison type sampler and the triple tube sampler are intended for relatively hard soil, and the double core sampler is intended for mainly rock, and they do not have a piston.

Samples collected with such samplers are observed, cut into appropriate lengths, and then subjected to compression tests to obtain mechanical information about the ground. However, the ground is not necessarily a continuum of uniform strength. A thin layer of sand is sandwiched within a clay layer, or a thin slip layer with extremely low strength, such as that seen in landslide areas, is sandwiched between layers. Additionally, cracks are often observed in bedrock. Therefore, when considering the safety of natural slopes, cuts, and embankments against sliding failure, even if the slope is thin (less than 1 cm thick), it is important to consider whether the slope is very weak, or if there are cracks in the slope. If the ground is tilted in the same direction (usually called a flowbed), no matter how strong the ground is as a whole, it will break at the weaker side. On the other hand, if the slope is in the opposite direction (receiving plate), there will be little influence from the weak side and stability will be maintained at the average ground strength of the surrounding area.
Similarly, in the supporting ground of structures such as dams and retaining walls that must maintain stability against water pressure and earth pressure, the direction of such external force is the same as the direction of weak layers or cracks. Whether or not it is a direction is extremely important. In addition, when a thin layer of sand, etc. is interposed in a clay layer, it is necessary to establish many investigation holes in order to investigate how the intercalated layer is distributed, but it is necessary to establish a large number of investigation holes. If the maximum inclination angle and direction (this is called strike and dip) of the intercalating layers found in a sample can be directly measured, the geological structure can be easily determined.

As mentioned above, quantitatively determining the strike and dip of weak surfaces such as intercalated layers and cracks found in collected samples is useful for studying the stability of the ground and structures, elucidating the geological structure, or It can be seen that this is extremely important ground information in elucidating the behavior of groundwater flowing through layers and cracks.

However, it is common practice to collect undisturbed samples continuously or intermittently from underground to quantitatively determine physical and mechanical properties.
Although it is possible to measure the maximum inclination angle of intercalated layers and cracks, the direction has not yet been measured.

With a piston-type sampler, the rod for pushing the sampler into the ground and the sampler are fixed, so the direction of the sample can be determined by lifting the sample to the ground without rotating the rod. However, since the rods are connected with screws every few meters, it is practically difficult to pull up the sample without giving it any rotation, so it is extremely difficult to identify the orientation of the sample using this method. be. In addition, Denison type samplers, triple tube samplers, double core barrels, etc. have double or triple tubes, and the sample is stored in the inner tube of the sampler, while only the outer tube rotates with a rod and collects the sample while excavating the ground. It is impossible to raise the sample to the ground in a fixed direction.

C. Problems that the invention aims to solve As mentioned above, with samplers based on conventional technology, it is difficult to accurately know the inclination and direction of the collected sample.The purpose of the invention is to solve these problems and to An object of the present invention is to obtain an inclination orientation display device for a ground sample, which has a simple structure and can reliably know the inclination angle and orientation of a ground sample.

D. Means for Solving the Problems Hereinafter, the inclination orientation display device for a ground sample according to the present invention will be explained using FIG. 1 corresponding to an embodiment.

The inclination direction display device according to this invention has an outer container 10 attached near the tip of the soil sample sampling device.
and an inner container 30 slidably inserted into the outer container, the outer container 10 having a first piston 11 mounted near the tip of the sample collection device and an opening 1 in the center.
a cylindrical main body 14 fixed to the first piston and having a bottom plate 13 formed with 2; and an inner container 30;
a second piston 19 extending axially outwardly through the opening 12 in the bottom plate for sliding thereon; and a locking projection 18 projecting outwardly from the bottom plate 13;
and the inner container 30 has a second piston 19
a cylindrical body 32 having a bottom plate 35 that engages with the
33, and the main body 3 collides with the first piston 11.
3, and a separation plate 31 that separates the inside of the main body into a chemical liquid chamber 39 and a hardening agent chamber 42, and a separation plate 31 that normally prevents communication between the chemical liquid chamber and the hardening agent chamber. , a valve 45 provided on the separating plate to communicate the chemical solution chamber and the curing agent chamber when the inner container is moved by the second piston;
A chemical liquid 54 placed in the chemical liquid chamber 39, an azimuth meter 55 having a specific gravity approximately the same as or lower than this chemical liquid, and a hardening agent chamber 42 which hardens the chemical liquid when mixed with the chemical liquid in the chemical liquid chamber. It has a curing agent 56.

E. Function By attaching this ground sample tilt direction display device near the tip of the sampler and pressing it against the bottom of the borehole, this tilt direction measuring device is fixed to the ground sample to be collected, and when it is further pressed, the valve opens. is opened and the hardening agent is mixed with the chemical liquid, solidifying the chemical liquid together with the compass. Therefore, by further pressing the sampler and collecting the necessary sample, the direction of the compass can be read by reading the inclination angle of the surface of the solidified chemical and the direction of the compass, even if the collected sample rotates. Since it rotates with the sample, the orientation and inclination angle at the time of sample collection can be easily determined.

F. Embodiments Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Ground sample tilt direction display device 1 according to the present invention
As shown in Figures 2 and 3,
It can be used by being attached near the tip of a sampler 2 according to the prior art disclosed in Japanese Patent No. 12589, etc., and its detailed structure is shown in FIG.

The tilt direction display device 1 includes an outer container 10 attached to a shoe 4 provided near the tip of the sampler 2, for example, at the tip of the inner tube 3 of the conventional triple tube sampler 2 shown in FIG. and an inner container 30 slidably inserted into the container.

The outer container 10 includes a first piston 11 that is attached by frictional engagement to the tip of the sampler 2, for example, the inside of the shoe 4 of the sampler 2 shown in FIG. 2, and a bottom plate with an opening 12 formed in the center. 13 and a transparent cylindrical body 14. A metal cylinder 15 is fitted around the outer periphery of the open end of the main body 14, inserted into the recess 16 of the first piston 11, and fixed by an O-ring 17.

The bottom plate 13 has a needle shape that pierces the bottom 6 of the borehole 5 to prevent rotation of the tilt direction display device 1 with respect to the bottom 6 when the tilt direction display device 1 is pressed against the bottom 6 of the borehole 5 as described later. It is screwed to the end of the main body 14 by a projection 18 . A second piston 19 extends axially outward through a central opening 12 in the bottom plate 13 . The inner end of the second piston 19 has a substantially hemispherical head 20, and a reaction plate 21 is screwed to the outer end of the second piston 19, and the space between the second piston 19 and the opening 12 is maintained watertight by an O-ring 22. ing.

The inner container 30 has two transparent cylindrical bodies 32 and 33 divided by a separating plate 31. A second piston 1 is provided at the outer end of the main body 32.
A main body 35 having a recess 34 having approximately the same shape as the head 20 of No. 9 is watertightly attached via an O-ring 36. Ribs 37 are formed radially inside the bottom plate 35.

The other end of the main body 32 is fixed to the separation plate 31 via an O-ring 38, thereby forming a chemical liquid chamber 39. One end of the other main body 33 is screwed to the separation plate 31, and a lid 40 is attached to the other end in a watertight and slidable manner via an O-ring 41 to form a hardening agent chamber 42. .

The separation plate 31 and the lid 40 have openings 43 and 44, respectively.
are formed, and a valve 45 extends through the openings 43,44. The valve 45 has a valve member 46 with a frusto-conical head and a stopper 4 screwed through a connecting block 47.
8. A spring 49 is inserted between the connecting block 47 and the separating plate 31, so that the valve 45 closes the opening 43 of the separating plate 31. An enlarged head 50 is formed at the outer end of the stopper 48, and is held in a watertight and slidable manner with the lid 40 by an O-ring 51. A spring 52 is inserted between the lid 40 and the separation plate 31, whereby the lid 40 is pressed against the first piston 11, and the head 50 of the stopper 48 is engaged with this.
Closing of the opening 43 by the valve member 46 is further ensured. Note that the reference numeral 53 indicates an air hole.

Furthermore, the chemical liquid chamber 39 contains an appropriate amount of a chemical liquid 54 with low viscosity and an azimuth meter 55 that has approximately the same specific gravity as this chemical liquid 54 or is lighter than this chemical liquid 54. A curing agent 56 is included which, when mixed, can cure it in a relatively short period of time, for example around 5 minutes. The chemical solution 54 and the hardening agent 56 are specially formulated for this device, and the two liquids are mixed without stirring and harden in about 5 minutes, and the product name Kurigel-300 is used, which remains transparent even after hardening. It is preferable.

Next, a method of using the tilt direction display device shown in FIG. 1 will be explained.

First, the main body 33 of the inner container 30, the valve 45,
Springs 49, 52 and lid 40 are assembled and integrated to form hardener chamber 42. Next, turn this upside down, screw the separation plate 31 into the main body 33, and connect the main body 32 to this to form the chemical liquid chamber 39. After putting an appropriate amount of curing agent 56 into this and pushing up the lid 40, the valve member 46 opens and the curing agent 56 enters the chemical chamber 3.
9 into the curing agent chamber 42. Next, after putting the chemical liquid 54 and the compass 55 into the chemical liquid chamber 39 and fitting the bottom plate 35, the second piston 19 has been inserted into the opening 12 of the bottom plate 13 and the reaction force plate 21 has been screwed to the bottom plate 13. It is ready for use by placing it in the body 14 of the attached outer container 10 and connecting it to the first piston 11.

In actual use, the tilt direction display device 1 assembled as shown in FIG. 1 is attached to the tip of the sampler 2 as shown in FIG. 2, and is lowered to the bottom 6 of the borehole 5. . And the second
When the second piston 19 reaches the bottom 6, the second piston 19 is pushed up by the weight of the sampler 2, and the valve 45 operates as shown in FIG.

That is, when the outer container 10 further descends due to the weight of the sampler 2 after the second piston 19 reaches the bottom 6 of the borehole 5, the second piston 1
9 pushes up the inner container 30 via the bottom plate 35. At this time, the lid 40 of the inner container 30 is in contact with the first piston 11 and cannot be moved. The body 33 thus slides relative to the lid 40 until it abuts the first piston 11. In other words, the main body 33 rises while compressing the volume of the curing agent chamber 42 . Since the head 50 of the stopper 48 of the valve 45 contacts the first stopper 11 before the top of the main body 33 contacts the first stopper 11, the movement of the valve member 46 is prevented. Since the separating plate 31 is further slightly raised, the opening 43 of the separating plate 31 is opened and the curing agent chamber 42 communicates with the chemical liquid chamber 39. Therefore, the pressure in the curing agent chamber 42 increases and the curing agent 56
is injected into the chemical liquid chamber 39 in the second step as shown by reference numeral 56A.

At this time, since the protrusion 18 is stuck into the bottom 6 of the borehole 5, the tilt direction display device 1 is held without rotating. 5 in this state
After standing still for a minute, the magnet 155 floating in the chemical solution 54 points north, and the magnet 55 is fixed as the chemical solution 54 hardens. Next, as shown in FIG. 4, the sampler 2 is press-fitted into the ground from the bottom 6 of the hole, the ground sample 7 is taken into the sampler 2, and this is pulled up to the ground. The inner pipe 8 containing the sample 7 is removed from the sampler 2, and the ground sample 7 is pulled out from the pipe 8 together with the tilt direction display device 1 without rotating. At this time, inner container 3
Further accuracy can be ensured by marking 0 and pipe 8 in advance. next,
removing the first piston 11 and the main body 14;
After removing the lid 40 from the inner container 30, the direction of the compass 55 is read, and at the same time, the solidified chemical solution 5 is removed.
Measure the slope of the surface of 4. In this way, the slope and orientation of the ground sample can be read very accurately and easily.

The bodies 14, 32, 33 of the outer container 10 and the inner container 30 are preferably made of transparent plastic, and the other parts are preferably made of aluminum, which is a non-magnetic material.

G. Effects of the invention As described above, the soil sample tilt direction display device according to the invention has an extremely simple structure, and samples can be collected by simply applying the sampler's own weight without the need for any other special operations. The slope of the ground sample and its orientation can be displayed reliably.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the tilt orientation display device for ground samples according to the present invention, and Figure 2 shows the tilt orientation display device shown in Figure 1 attached to a conventional sampler and lowered into a borehole. FIG. 3 is a cross-sectional view showing the operating state of the slope orientation display device shown in FIG. 1, and FIG. FIG. 1... Tilt direction display device, 2... Sampler,
5... Borehole, 6... Bottom, 7... Sample, 1
0... Outer container, 11... First piston, 12
...Opening, 13...Bottom plate, 14...Body, 18...
...Protrusion, 19... Second piston, 30... Inner container, 31... Separation plate, 32, 33... Main body, 3
9... Chemical solution chamber, 40... Lid, 42... Hardening agent chamber,
54... Chemical solution, 55... Direction meter, 56... Hardening agent.

Claims (1)

[Claims for Utility Model Registration] An outer container 10 is installed near the tip of a soil sampling device, and an inner container 30 is slidably inserted into the outer container. a first piston 11 attached near the tip of the sample collection device; a cylindrical body 14 fixed to the first piston and having a bottom plate 13 with an opening 12 formed in the center;
a second piston 19 extending axially outwardly through the opening 12 in the bottom plate for sliding the inner container 30; and a locking projection 18 projecting outwardly from the bottom plate 13. , the inner container 30 is connected to the second piston 19
a cylindrical body 32 having a bottom plate 35 that engages with the
33, and a lid 40 that is slidably attached to the top of the main body 33 in contact with the first piston 11;
A separating plate 31 that separates the inside of the main body into a chemical liquid chamber 39 and a hardening agent chamber 42 normally prevents communication between the chemical liquid chamber and the hardening agent chamber, and the inner container is moved by the second piston. a valve 45 provided in the separation so as to communicate these chemical liquid chambers and the curing agent chamber when An azimuth inclination display device for a ground sample, comprising an azimuth meter 55 and a hardening agent 56 placed in the hardening agent chamber 42 that hardens the chemical when mixed with the chemical.