JP2004117074A - Soil sampling device - Google Patents

Abstract

Provided is a soil collecting device that is more resistant to impact and can increase the diameter of a collecting cylinder.
A sampling cylinder, a cone having a diameter that closes a tip opening of the sampling cylinder and movable in the sampling cylinder, a distal end side formed with a screwing surface to a rear end of the sampling cylinder, and a trailing end. A drive head 30 having a rear end side 32 formed with a screwing surface to the extension cylinder of the rod, a rod 40 for pressing the cone 20 so as not to move into the sampling cylinder, and a rod 40 inserted into the drive head and A rod stopper 50 for centering by accommodating the end portion, and a drive cap 60 mounted on the rear end side 32 of the drive head and in contact with the head of the rod stopper for positioning. Since there is no screwing structure in the portion that receives the force of the rod, the impact resistance is higher than in the prior art.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a soil sampling device called a sampler for sampling soil from a stratum at an intended depth of ground to investigate soil contamination or the like.
[0002]
[Prior art]
For example, as a sampling device for sampling soil from an underground depth of 3 m or more, a method of hammering out a metal cylinder to a target depth and extracting it is often used because of its simplicity. However, if the cylinder is simply driven into the cylinder, undesired soil up to the target depth enters the cylinder, so that the influence of this is inevitable. For example, even if the purpose is to investigate the geology at a depth of 3 m, if the soil about 1 m above it is contaminated with dioxin or the like, the contaminated soil enters the cylinder first, and the inside of the cylinder is contaminated. However, the target soil at a depth of 3 m is affected by the contamination.
[0003]
Therefore, Patent Document 1 discloses a soil sampling device that prevents soil from entering the cylinder up to a target depth. This soil collecting apparatus has a structure in which a piston tip (cone) 18 protrudes from the tip of a sample tube (collection cylinder) 10, and the piston tip 18 is pressed by a rod 26 to cover the sample tube 10. . The rod 26 has a distal end screwed into the piston tip 18, a rear end 28 extending through the sample tube 10 to the drive head 32 on the opposite side, and the rear end 28 is held by a piston stop 42. Have been.
[0004]
Such a soil collecting apparatus is configured such that the rear end of the sample tube 10 is hit into the ground by hitting it with a hydraulic hammer or the like, and a plurality of probe extensions 48 are added upward from the sample tube 10 by the drive head 32. Then, the sample tube 10 at the distal end reaches the target depth. At this time, since the rod 26 is pressed by the piston stop 42, the piston tip 18 keeps the sample tube 10 covered.
[0005]
When the target depth is reached, the screwing of the piston stop 42 is unscrewed and removed, and further the probe extension 48 is added and driven in. At this time, since the pressing is not performed, the piston tip 18 is pushed into the sample tube 10 by the soil. And rise relatively. Therefore, soil at a target depth can be collected in the sample tube 10 at the tip.
[0006]
As described above, since the piston is covered with the piston tip 18 up to the target depth, contamination by soil at a depth other than the target is prevented.
[0007]
[Patent Document 1]
US Pat. No. 5,186,263
[Problems to be solved by the invention]
The invention described in Patent Document 1 is very excellent in preventing contamination by undesired soil. However, since the structure in which the piston stop 42 is screwed into the drive head 32 to hold down the rod 26, the invention described in When driven into the ground, the force applied to the piston stop 42 from the rod 26 that receives the piston tip 18 piercing the ground may cause the screw thread to be crushed. Can not be done. Since this phenomenon is more likely to occur as the diameter of the sample tube 10 increases and the force applied to the piston tip 18 increases, the diameter of the sample tube 10 cannot be too large in the structure of Patent Document 1.
[0009]
In addition, since the piston tip 18 and the rod 26 are also screwed together, the threads may be crushed, which also makes it easy to increase the diameter of the sample tube 10 (for example, to about 10 cm). Can not.
[0010]
The present invention focuses on such a problem, and provides a soil sampling device that is more resistant to impact and that can increase the diameter of a sampling cylinder.
[0011]
[Means for Solving the Problems]
The soil sampling apparatus of the present invention includes a sampling cylinder having both ends opened, a cone having a diameter that closes the opening of the tip of the sampling cylinder and movable in the sampling cylinder, and a screwing surface to a rear end of the sampling cylinder. A hollow drive head having a front end side formed with a rear end side formed with a screwing surface to a front end portion of a subsequent extension cylinder, and a cone located at a front end opening of the collection cylinder are prevented from moving into the collection cylinder. A rod having a leading end for holding down, a rear end extending into the drive head, a rod stopper which is inserted into the drive head and accommodates the rear end of the rod, and a rod stopper which aligns the rear end of the drive head; And a drive cap mounted on the end side and abutting against the head of the rod stopper to perform positioning.
[0012]
This soil sampling device is driven into the ground by hitting the drive cap with a hydraulic hammer or the like. However, the rod stopper simply accommodates the rear end of the rod, and is not screwed. In addition, the rod stopper and the drive cap also have a structure in which the head of the rod stopper comes into contact with the drive cap. That is, since the portion for receiving the force of the rod does not have a threaded structure, the impact resistance is higher than that of the related art. In addition, if the drive cap has a structure in which the drive cap is mounted only on the rear end side of the drive head and is not screwed, biting by the impact force can be effectively prevented.
[0013]
If the rod has a structure in which the distal end surface is in contact with the cone located at the distal end opening of the sampling cylinder, the threaded structure is also eliminated at this portion, so that the impact resistance is further improved. In particular, if the rod for this purpose is made up of a contact rod whose tip contacts the cone and a refill rod connected to the rear end of the contact rod, the tip of the contact rod is made thicker. It is good because it can be formed to be thick so as not to be easily crushed by an impact, and the biting between the cone and the rod can be more reliably prevented.
[0014]
It is more preferable that the front end side end face of the drive head be a stopper wall for receiving the rear end of the resin inner cylinder inserted into the sampling cylinder. The resin inner cylinder is very convenient when taking out the collected soil, and the geological condition can be easily collected and stored as it is.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 show an example of the soil collecting apparatus of the present invention in an assembled sectional view and an exploded sectional view.
[0016]
The soil sampling device S includes a sampling tube 10 having both open ends, a cone 20 covering a front end opening 11, a drive head 30 screwed into a rear end opening 12 of the sampling tube 10, and sampling from the cone 20 to the drive head 30. It comprises a rod 40 extending into the cylinder 10, a rod stopper 50 for receiving and adjusting the rod 40 in the drive head 30, and a drive cap 60 covering the drive head 30 and positioning the rod stopper 50. Further, in the case of this example, a plastic inner cylinder I is inserted into the sampling cylinder 10.
[0017]
The tip end of the sampling tube 10 is formed of a thick cone receiving member 13, and the cone receiving member 13 forms a tip opening 11. The cone receiving member 13 is structured so as to be screwed to the main body of the sampling tube 10. By screwing the thick cone receiving member 13 to a tip portion, the strength when traveling underground is sufficiently increased. Can be taken. Further, the cone receiving member 13 of the present example also has a role of holding the spacer P of the inner cylinder I.
[0018]
A step 14 is formed on the inner wall of the cone receiving member 13 forming the distal end opening 11, and the step 21 formed on the outer peripheral surface of the cone 20 is engaged with the step 14, so that the cone 20 is held so as not to protrude from the distal end opening 11.
[0019]
The cone 20 has a diameter capable of moving inside the inner cylinder I inserted into the sampling cylinder 10, and an elastic o-ring 22 is provided on the outer peripheral surface to improve the sealing property when the cone 20 is located at the distal end opening 11. Is set in the slit. The rear end face of the cone 20 is provided with a contact recess 23 for contacting the rod 40.
[0020]
The drive head 30 is hollow with both ends open, a threaded surface where the outer periphery of the distal end 31 is screwed into the inner peripheral surface of the rear end opening 12 of the sampling cylinder 10, and the outer periphery of the rear end 32 is a subsequent extension cylinder Are screwed surfaces that are screwed into the inner peripheral surface of the distal end opening. Further, the end of the distal end 31 is formed to be thick, so that the distal end surface 33 becomes a stopper wall of the inner cylinder I.
[0021]
The rod 40 includes a contact rod 41 that comes into contact with the cone 20, and a refill rod 42 that is screwed to the contact rod 41 and extends into the internal space 34 of the drive head 30. The contact rod 41 has a tip surface 43 housed in the contact concave portion 23 of the cone 20 and contacts the bottom surface, and plays a role of pressing the cone 20. The distal end surface 43 and the distal end portion are not threaded at all and are resistant to impact. In order to increase the impact resistance, the contact rod 41 can be made solid. As described above, the contact rod 41 only comes into contact with the cone 20 and has a structure in which there is no threaded portion. Therefore, the contact rod 41 can be easily removed from the cone 20 without biting or the like.
[0022]
The extension rod 42 has a threaded surface at the inner peripheral surface of the distal end portion 44, and is screwed to the outer peripheral surface at the rear end portion of the contact rod 41. The rear end 45 of the extension rod 42 extends into the internal space 34 of the drive head 30 and is accommodated in the rod stopper 50.
[0023]
The rod stopper 50 has a substantially hat shape including a large diameter portion 51 and a small diameter portion 52, and the diameter of the large diameter portion 51 is substantially equal to the diameter of the internal space 34 of the drive head 30. An accommodation recess 53 is provided in the center of the end surface of the large diameter portion 51, and the rear end 45 of the rod 42 is added to the accommodation recess 53 so that the alignment of the rod 40 can be performed. I have.
[0024]
The drive cap 60 has a solid rod shape, and a receiving recess 61 for receiving the rear end side 32 of the drive head 30 is recessed from one end surface, and a rod stopper 50 is provided at the bottom central portion of the receiving recess 61. A concave portion 62 is formed to abut the head of the small-diameter portion 52 in FIG. The drive cap 60 is mounted on the rear end side 32 by the accommodation recess 61, and is positioned by bringing the rod stopper 50 into contact with the recess 62. Since there is no screwing structure in the housing recess 61, biting due to impact at the time of driving is prevented.
[0025]
To assemble the soil collecting apparatus S having the above configuration, first, the cone 20 and the spacer P are set on the cone receiving member 13, screwed into the main body of the collecting cylinder 10, and assembled into the collecting cylinder 10. Of the drive head 30 is screwed into the rear end opening 12 of the sampling tube 10 and assembled. Next, the rod 40 is inserted from the drive head 30 into the sampling cylinder 10 to bring the contact rod 41 into contact with the contact recess 23 of the cone 20, and the rod stopper 50 is inserted into the drive head 30 to receive the rod. The rear end 45 of the rod 40 is accommodated in the recess 53. A drive cap 60 is placed on this so as to accommodate the rear end side 32 of the drive head 30 in the accommodation recess 61 so that the head of the rod stopper 50 contacts the recess 62 on the bottom surface of the accommodation recess 61. I do.
[0026]
The soil collecting apparatus S assembled in this manner is driven into the ground from the cone 20 by hitting the drive cap 60, and at this time, the cone 20 and the rod 40, the rod 40 and the rod stopper 50, Since no threaded portion is formed between the rod stopper 50 and the drive cap 60 and between the drive cap 60 and the drive head 30, biting between the components is reliably prevented.
[0027]
A collecting method using the above-described soil collecting apparatus S will be described with reference to FIGS.
[0028]
First, the soil sampling device S assembled in the state shown in FIG. 1 is driven into the ground to about ／ of its length. In this state, the drive cap 60 and the rod stopper 50 are removed, and the extension cylinder E is screwed into the rear end side 32 of the drive head 30 and assembled. This extension tube E is the same as the sampling tube 10 from which the cone receiving member 13 constituting the distal end portion has been removed, the sampling tube 10 without the cone receiving member 13 is turned upside down, and the rear end opening (12) is moved to the distal end portion. And assembled by screwing it to the rear end side 32 of the drive head 30.
[0029]
After assembling the extension tube E (or before assembling), an extension rod 42 that is the same as the extension rod 42 constituting the rod 40 is assembled. That is, the screwing surface of the distal end portion 44 of the extension rod 42 is screwed to the rear end portion 45 of the rod 40. Then, the rod stopper 50 is set in the extension cylinder E so that the rear end portion 45 of the extension rod 42 is accommodated in the accommodation recess 53, and the drive cap 60 is put on the rod stopper 50 from above. Then, the rear end portion of the extension tube E (that is, the screw portion with the cone receiving member 13) is housed in the housing recess 61 of the drive cap 60, and the head of the piston stopper 50 comes into contact with the recess 62. Note that the inner diameter of the extension tube E (that is, the sampling tube 10) and the inner diameter of the drive head 30 (the diameter of the internal space 34) are the same in this example.
[0030]
Thereafter, the soil collecting device S is further driven into the ground by hitting the drive cap 60, and is stopped when about 2/3 of the extension tube E enters the ground, and the drive cap 60 and the rod stopper 50 are removed. Next, a new extension tube E is screwed into the rear end portion of the extension tube E in the same manner as described above, and assembled, and the front end portion 44 of the new extension rod 42 is attached to the rear end portion 45 of the extension rod 42. Screw and assemble.
After that, the piston stopper 50 and the drive cap 60 are set and hit as described above.
[0031]
Thereafter, the soil collecting device S is driven into the target depth while assembling and extending the required number of the extension cylinders E and the extension rods 42.
[0032]
When the target depth is reached, the drive cap 60 and the rod stopper 50 are removed, and the extension rods 42 and the rods 40 connected to each other are pulled up. As a result, the cone 20 located at the distal end opening 11 of the sampling tube 10 enters a free state without pressing.
[0033]
In this state, when the drive cap 60 is put on the last extension cylinder E, and the drive cap 60 is hit and driven, the sampling cylinder 10 advances, while the cone 20 is no longer held down, so that it stays there, that is, proceeds. The inside of the sampling cylinder 10 is relatively retreated, and the soil at a target depth is taken into the inner cylinder I. After the necessary amount and the soil sampling device S are driven, if the whole is pulled out from the ground, the soil at the target depth is extracted in a state where the soil is taken into the sampling tube 10. Thereafter, the collected soil together with the inner cylinder I may be taken out of the collection cylinder 10. Since the soil can be taken out while being wrapped by the plastic inner cylinder I, it is very convenient for storage, transportation, and the like.
[0034]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the soil sampling apparatus of this invention, since it can be set as the structure in which the screw is not formed in any connection part of a cone, a rod, a rod stopper, and a drive cap, the structure resistant to a hit is provided, The life is much longer than that. In addition, since the impact resistance is increased, the diameter of the sampling cylinder can be made larger than that of the conventional product, which is convenient for collecting a necessary and sufficient amount of soil.
[Brief description of the drawings]
FIG. 1 is an assembled sectional view of a soil sampling device according to the present invention.
FIG. 2 is an exploded sectional view of the soil sampling device according to the present invention.
FIG. 3 is a sectional view showing an example of use of the soil sampling device according to the present invention.
FIG. 4 is a cross-sectional view showing a state when soil is collected by the soil collecting apparatus according to the present invention.
[Explanation of symbols]
S Soil sampling device 10 Sampling cylinder 11 Tip opening 12 Rear end opening 13 Cone receiving member 14 Step 20 Cone 21 Step 22 O-ring (elastic ring)
23 Contact recess 30 Drive head 31 Front end 32 Rear end 33 End side end surface 34 Internal space 40 Rod 41 Contact rod 42 Reinforcement rod 43 Front surface 44 Front end 45 Rear end 50 Rod stopper 51 Large diameter portion 52 Small diameter portion 53 accommodating recess 60 drive cap 61 accommodating recess 62 recess I inner cylinder P spacer E extension cylinder

Claims (4)

A sampling cylinder having both ends opened, a cone having a diameter to close the opening of the tip of the sampling cylinder and movable in the sampling cylinder; A hollow drive head having a rear end side formed with a screwing surface to a distal end of the extension cylinder, and a tip for pressing the cone positioned at the tip end opening of the sampling cylinder so as not to move into the sampling cylinder. A rod having a rear end portion extending into the drive head; a rod stopper inserted into the drive head to accommodate the rear end portion of the rod to perform centering; and And a drive cap mounted on an end side and abutting against the head of the rod stopper to perform positioning. The soil sampling device according to claim 1, wherein the rod has a structure in which a tip surface abuts a cone located at a tip opening of the sampling cylinder. 3. The soil collecting apparatus according to claim 2, wherein the rod comprises a contact rod having a tip portion abutting on the cone, and an extension rod connected to a rear end portion of the contact rod. The soil sampling device according to any one of claims 1 to 3, wherein a front end surface of the drive head serves as a stopper wall that receives a rear end of the resin inner cylinder inserted into the sampling cylinder.

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