JP5452286B2 - Soil collector - Google Patents

Description

  The present invention relates to a soil collector used for drilling a penetration hole into the ground with a screw point or other drilling member, and for storing and collecting soil in the penetration hole at a predetermined underground depth. .

  Conventionally, as a soil collecting device for collecting a soil sample in the ground, for example, a geological survey device described in Patent Document 1 has been proposed. This geological survey device collects an underground soil sample using a screw point and a rod for a Swedish sounding test, and a sampling section is provided at the center in the length direction of the rod piece of the rod. This sampling part is provided with the pocket which is a recessed part which accommodates the underground soil, and the cover body which block | closes the opening part of the pocket.

  According to this geological survey device, when the screw point is rotated in the forward rotation direction to penetrate the ground, the state where the opening of the pocket of the sampling unit is closed by the lid is maintained, and the sounding test is in progress. In the meantime, the soil of an undesired underground depth is prevented from entering the pocket, while in the reverse rotation direction, friction with the inner peripheral surface of the penetration hole drilled by the screw point causes The lid floats up to open the opening of the pocket so that the soil at the desired depth can enter the pocket.

Japanese Patent No. 431598

  However, in the geological survey device described above, since the pocket of the sampling part is a vertically long concave hole recessed in a very small part of the outer peripheral surface of the rod piece, the volume that can accommodate the soil is limited and sufficient There is a problem that an amount of soil sample cannot be collected. In addition, there is a problem in that it is difficult to take out the soil sample accommodated in the vertically long concave hole in which the pocket for accommodating the soil is recessed in the outer peripheral surface of the rod piece.

  In addition, since the lid of the sampling unit is structured to lift from the outer periphery of the rod in a rotating state in the reverse rotation direction and open the opening of the pocket of the sampling unit, the resin material such as flexible plastic It is necessary to form using. In addition, the lid has a very simple mounting structure in which a pair of upper and lower pins provided on the lid is inserted into a mounting hole provided on the mounting portion of the rod.

  For this reason, when the blade of the lid body scrapes off the soil in the penetration hole, an excessive shearing force is likely to be generated on each pin, and the lid body may break due to the shearing force, and the lid body may fall off the rod. It is. Also, when the blade of the lid body scrapes the soil, an external force is applied to the lid body, such as being lifted or peeled off from the outer peripheral surface of the rod piece by contact with the soil (friction resistance), so that the pin There is also a concern that the lid body may drop out of the attached portion.

  Furthermore, if the lid comes off from the rod in this way, the pocket of the sampling unit cannot be closed, and when the rod is pulled out of the penetration hole, soil of an undesired underground depth is pocketed. If it is mistakenly mixed in, proper soil collection cannot be achieved.

  The present invention has been made to solve the above-described problems, and can sufficiently secure the volume of the collection space for storing the soil sample, and can easily take out the collected soil sample from the collection space. An object of the present invention is to provide a soil collector capable of avoiding the contamination of soil at an undesired underground depth into the sampling space by preventing the shutter plate for opening and closing the sampling port for taking the soil into the space.

  In order to achieve this object, the soil sampler according to claim 1 is capable of connecting a drilling member to the distal end and connecting a rod to the proximal end, and forwardly rotating the rod around the central axis. It is used to collect and store the soil in the penetration hole by drilling the penetration hole in the ground with a drilling member and rotating the rod backward around the central axis at a predetermined underground depth A sampling tube formed in a cylindrical body having a sampling space for accommodating the soil in the penetration hole at the inner periphery, and an opening formed in one end in the axial direction of the sampling tube in communication with the sampling space The tip hole is closed, and the tip end hole is closed by being directly and detachably connected to the axial end of the sampling tube having the tip hole, and the base end of the drilling member is connectable Or a tip lid member integrally formed at the base end portion of the hole drilling member, and the tip lid portion A sampling port provided in communication with the sampling space on the outer periphery of the sampling tube to which the sampling tube is connected, and an outer tube that is externally fixed to the outer periphery of the sampling tube having the sampling port. An outer cylinder opening that is formed in a part of the outer periphery of the outer cylinder tube and communicates with the sampling port to expose the sampling port to the outside; and the sampling tube for opening and closing the outer cylinder opening and the sampling port. A shutter plate that is sandwiched between an outer peripheral portion and an inner peripheral portion of the outer tube and is slidably disposed in the circumferential direction, and is provided at one end portion in the circumferential direction of the shutter plate. The outer tube extends outward from the outer peripheral surface, receives an external force in the closing direction of the shutter plate in the through hole by forward rotation of the sampling tube, and in the through hole by reverse rotation of the sampling tube Scraping the soil in the penetration hole by receiving external force in the opening direction And a scraping claw.

  The soil sampler according to claim 2 is the soil sampler according to claim 1, in addition to the tip hole and the tip lid member, or instead of the tip hole and the tip lid member, the other axial end of the sampling tube. A base end hole that is open to communicate with the sampling space, and a base end hole that is detachably connected directly to the other axial end of the sampling tube having the base end hole. And the front-end | tip part of the rod is formed so that connection is possible, or is integrally formed in the front-end | tip part of a rod.

  The soil sampler according to claim 3 is the soil sampler according to claim 1 or 2, wherein the outer tube is a cylinder that can be fitted onto the outer periphery of the sample tube by combining the outer tube with a pair of half-cylinders in a half-cracked state. It becomes a shape.

  According to the soil collector of any one of the first to third aspects, when the soil collector is penetrated to a predetermined underground depth, the tip of the drilling member connected to the tip of the soil collector is projected to the ground. At the same time, a rotational force is applied to the rod connected to the base end portion so as to rotate forward about the central axis. Then, the drilling member and the soil sampler are integrated with the rod and rotated around the central axis, and the penetration hole is drilled into the ground by the drilling member.

  In addition to drilling the penetration hole by forward rotation of the drilling member, drilling may be promoted by applying the weight of the user or the weight of the weight to the rod, or the drilling member If it is difficult to penetrate, the upper end portion of the rod on the ground may be struck toward the ground, and the drilling member may be struck into the ground.

  In this manner, the soil collector is moved forward through the penetration hole to a predetermined depth by the hole drilling by the hole drilling member. Here, from the outer peripheral surface of the outer cylinder tube on the outermost side of the positively rotating soil sampler, a soil claw is extended to the outside, and this soil claw is in contact with the soil in the penetration hole, An external force acting in the direction opposite to the rotation direction of the soil collector, that is, in the closing direction of the shutter plate, acts on the clay nail.

  The shutter plate is pushed and slid in the closing direction by the external force acting on the clay claw, and the outer cylinder opening and the sampling port are closed. Further, when the outer cylinder opening is fully closed, the claw pawl is stopped by the edge of the outer cylinder opening at one end in the circumferential direction, and further sliding movement in the closing direction of the shutter plate is stopped.

  The soil collector continues to rotate forward in the penetration hole, so that the closed state of the outer cylinder opening and the sampling port by the shutter plate is maintained, and sampling is performed until the soil collector reaches a predetermined underground depth. It is possible to prevent soil at an unnecessary underground depth from being mixed into the collection space from the outer cylinder opening through the collection opening.

  When the soil collector reaches a predetermined underground depth by drilling with such a drilling member, the soil in the penetration hole at the underground depth is collected. Specifically, when the soil collector reaches the underground depth at which soil sampling is performed, first, the shutter plate is slid to open the outer cylinder opening and the sampling port, so that the rod rotates backward about the central axis with respect to the rod. A rotational force is applied, and the hole-drilling member and the soil sampler are reversely rotated about the central axis.

  In this way, when the soil collector is rotated backward in the penetration hole, the soil in the penetration hole comes into contact with the claw claw, and the direction of rotation of the soil collector is opposite, that is, An external force acts in the direction of opening the shutter plate. And when such an external force acts on the clay nail, the shutter plate is slid in the opening direction, and the outer cylinder opening and the sampling port are opened.

  Here, when the outer cylinder opening is fully opened by the sliding movement of the shutter plate, the claw pawl is stopped at the edge of the outer cylinder opening at the other circumferential side, and further sliding in the opening direction of the shutter plate is performed. The movement is stopped. Then, the movement of the soil claws toward the opening direction of the shutter plate is stopped, and in this state, the soil collector is rotated in the reverse direction, so that the soil at the predetermined underground depth in the penetration hole is removed by the soil claws. It is scraped off.

  And the soil scraped off by the soil claw is taken into the collection space of the collection tube through the outer cylinder opening and the collection port, and is accommodated in the collection space. After the soil sample is accommodated and collected in the collection space in this way, the soil collector is pulled up from the predetermined underground depth to the ground through the penetration hole and collected. To collect the soil sampler, a rotational force is applied to rotate forward about the central axis with respect to the rod, and the hole drilling member and the soil sampler are rotated positively about the central axis.

  As the soil collector is rotated in this way, an external force acting on the claw pawl in the closing direction of the shutter plate acts, and as a result, the shutter plate is slid in the closing direction, The outer cylinder opening and the sampling port are closed again. After closing the outer cylinder opening and the sampling port, the drilling member and the soil sampler are pulled out from the penetration hole and collected by pulling out the rod from the penetration hole.

  Note that when the rod is pulled out, a rotational force for positive rotation about the central axis may be applied to the rod. By doing so, it is possible to pull them out from the penetration hole while applying an external force that closes the shutter plate while rotating the rod member and the soil collector positively around the central axis.

  In order to take out the soil sample in the collection space of the collection tube, the distal end hole or the proximal end hole is opened by removing the distal end cover member or the proximal end cover member from one axial end or the proximal end of the collection tube. The collection space is communicated with the outside, and a soil sample in the collection space is taken out through the distal end hole or the proximal end hole. In addition, the shutter plate may be slid in the opening direction to open the outer cylinder opening and the sampling port, and the soil sample in the sampling space may be taken out from the sampling port.

  According to the soil sampler of the present invention, the collection space for collecting the soil is the inner periphery of the cylindrical collection tube, so that compared to the case where the pocket for locally storing the soil is recessed. Thus, it is possible to secure a larger soil storage capacity and to store a sufficient amount of soil samples. Further, the soil sample accommodated in the collection space of the collection tube is opened at the distal end hole or the proximal end hole by removing the distal end cover member or the proximal end cover member from one end or the other end in the axial direction of the collection tube. Therefore, it can be easily taken out from the sampling space through the distal end hole or the proximal end hole.

  Also, the shutter plate having the soil claw is opened / closed by contact with the soil in the penetration hole and receiving external force, and the outer periphery of the sampling tube and the inner periphery of the outer tube Are slidably arranged in a state of being sandwiched between the two. For this reason, in order to open and close the sampling port and the outer cylinder opening, a structure in which the lid comes into contact with the soil and rises is not adopted, and the soiled claw is in contact with the soil and receives excessive frictional resistance. As a result, it is possible to prevent the shutter plate from falling off due to, for example, rolling up, and to avoid the contamination of soil at an undesired underground depth into the sampling space.

It is the figure which showed an example of the use condition of the soil sampling device using the soil collector which is one Example of this invention. It is the elements on larger scale regarding the attachment part of the soil collector in the soil sampling apparatus shown by FIG. It is component drawing of a sampling pipe, (a) is a front view, (b) is a transverse cross-sectional view in the B1-B1 line and B2-B2 line of (a), (c) is a longitudinal cross-sectional view. is there. It is a component diagram of an outer cylinder pipe, (a) is a front view, (b) is a right side view, (c) is a top view, (d) is a D1-D1 line of (a). And is a cross-sectional view taken along line D2-D2. It is a component diagram of a shutter board, Comprising: (a) is a top view, (b) is a front view. It is component drawing of a point joint, (a) is a front view, (b) is a cross-sectional view in the BB line of (a), (c) is a longitudinal cross-sectional view. It is component drawing of a rod joint, (a) is a front view, (b) is a cross-sectional view in the BB line of (a), (c) is a longitudinal cross-sectional view. It is the enlarged view which carried out the partial cross section view about the attachment part of the soil sampling device in a soil sampling device, (a) shows the fully closed state of a shutter board, (b) shows the fully open state of a shutter board. It is shown. It is a cross-sectional view of a soil sampler, (a) is a shutter plate in the IX-IX line of FIG. 8 (a) in the fully closed state, (b) is IX-IX of FIG. 8 (b). It is a thing of the fully open state of the shutter board in a line. It is the elements on larger scale of the soil sampling device of Example 2, and the cross-sectional view partially shows the connection location of a drilling point and a soil collector. It is a component diagram of the drilling point of Example 3, wherein (a) is a front view, (b) is a bottom view, (c) is an end view taken along the line CC of (a), (D) is an end elevation in the DD line of (a). It is a component figure of the outer cylinder pipe of Example 4, Comprising: (a) is a front view, (b) is a right view, (c) is a top view. It is a component figure of the rod joint of Example 5, Comprising: (a) is a front view, (b) is a top view, (c) is a bottom view, (d) is a rod and a sampling tube. It is the front view which carried out the partial cross section which showed the connection state.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram illustrating an example of a usage state of a soil collection device 100 using a soil collection device 1 according to an embodiment of the present invention. As shown in FIG. 1, the soil collection device 100 mainly includes a soil collection device 1, a drilling point 2, and a rod 3.

  This soil collection device 100 connects the drilling point 2 to the tip of the soil sampler 1 and connects and integrates the rod 3 to the base end of the soil collection device 1, and then moves the rod 3 around the central axis. When the soil collector 1 reaches a predetermined depth, the rod 3 is reversely rotated around the central axis when the soil collector 1 reaches a predetermined depth. It is a device that collects and stores soil at this depth.

  In the following description, “forward rotation” is rotation around the central axis of the soil sampler 1, the drilling point 2, and the rod 3, and is equal to the rotation direction when drilling with the drilling point 2. Say things. Further, “reverse rotation” refers to rotation in which the soil collection device 100 rotates about the central axis and is in a direction opposite to the rotation direction when drilling by the drilling point 2.

  In addition, as a driving method for rotating the entire soil sampling device 100 by rotating the rod 3 during drilling by the soil sampling device 100, a handle 4 for manual rotation is attached to the base end portion of the rod 3 as shown in FIG. A method of rotating the rod 3 manually or a method of rotating the rod 3 by an automatic drilling device (not shown) used for the Swedish sounding test may be used.

  The drilling point 2 is a general-purpose screw point used for the Swedish sounding test, and is usually used by being screwed directly to the tip of the rod 3 for the Swedish sounding test. The drilling point 2 includes a drill-shaped screw portion 2a having a sharp tip and a taper base portion 2b formed integrally with a base end portion of the screw portion 2a. The taper base portion 2b is a point connecting screw shaft 5. To the point joint 13 (see FIG. 8).

  Further, each of the drilling point 2 and the point connecting screw shaft 5 is formed of a hardenable steel material such as a chromium molybdenum steel material (also referred to as an SCM steel material) which is a kind of alloy steel material for machine structure. In particular, the hardness of the screw portion 2a of the drilling point 2 is increased by quenching, and the point connecting screw shaft 5 is subjected to heat treatment that increases toughness.

  The point connecting screw shaft 5 is a full thread type stud bolt using a coarse thread formed separately from the drilling point 2. This point connecting screw shaft 5 is normally used for connecting the drilling point 2 to the tip of the rod 3.

  The rod 3 is a general-purpose rod 3 used for a Swedish sounding test. Usually, a drilling point 2 which is a screw point for a Swedish sounding test is directly screwed through a point connecting screw shaft 5 and used. Is.

  FIG. 2 is a partially enlarged view relating to a mounting portion of the soil collector 1 in the soil sampling apparatus 100 shown in FIG. As shown in FIG. 2, the soil collector 1 includes a sampling tube 10, an outer tube 11, a shutter plate 12, a point joint 13, and a rod joint 14. The soil collector 1 is formed of the same chromium molybdenum steel material as the drilling point 2.

  The sampling tube 10 is a cylindrical body that collects and stores the soil in the penetration hole drilled in the ground. A sampling port 10 a is provided on the outer peripheral surface of the sampling tube 10, and the sampling port 10 a is drilled in order to take soil into the inner peripheral part (sampling space 10 b) of the sampling tube 10. The outer tube 11 is a tubular body that is externally fitted on the outer surface of the sampling tube 10.

  The shutter plate 12 is a lid used for opening and closing the sampling port 10 a of the sampling tube 10 and the outer cylinder opening 11 a of the outer tube 11. The point joint 13 is a joint for connecting the drilling point 2 to the distal end portion of the sampling tube 10, and the rod joint 14 is a joint for connecting the rod 3 to the proximal end portion of the sampling tube 10.

  According to this soil sampler 1, when the collection tube 10, the outer tube 11, the shutter plate 12, the point joint 13 and the rod joint 14 are assembled, the collection tube 10, the outer tube 11, the point joint 13 and the rod joint The 14 central axes coincide with each other on the same line, and this is the central axis of the entire soil collector 1. Further, the central axis of the soil sampler 1 coincides with the center line of the drilling point 2 and the rod 3 connected thereto, and also coincides with the central axis of the soil collection device 100 itself.

  In the following description, the “axial direction” is the same direction as the central axis of the sampling tube 10, the outer tube 11, the point joint 13 or the rod joint 14, the soil collector 1, or the soil sampling device 100. Say. In addition, the “circumferential direction” refers to a rotation direction around the central axis of the sampling tube 10, the outer tube 11, the point joint 13 or the rod joint 14, the soil collector 1, or the soil sampling device 100. .

  3 is a component diagram of the sampling tube 10, FIG. 3 (a) is a front view, and FIG. 3 (b) is a cross-sectional view taken along lines B1-B1 and B2-B2 in FIG. 3 (a). FIG. 3C is a longitudinal sectional view. As shown in FIG. 3, the collection tube 10 is formed in a cylindrical shape, and the inner periphery thereof is a collection space 10 b that accommodates the collected soil (FIGS. 3B and 3C). reference.). In addition, a long hole-like sampling port 10a communicating with the sampling space 10b is formed in one place on the outer peripheral surface of the sampling tube 10 (see FIG. 3A).

  As shown in FIG. 3A, the sampling port 10a is formed with a long opening width in the axial direction and a short opening width in the circumferential direction. The sampling port 10 a has an axial opening width that is smaller than the total axial length of the sampling tube 10, and the drilling position is the axial center of the sampling tube 10. Furthermore, the opening width in the circumferential direction of the sampling port 10a is smaller than the inner diameter of the sampling space 10b, and is, for example, about 2/3 times the inner diameter of the sampling space 10b.

  On the outer periphery of the sampling tube 10, a small diameter portion 10c having a small outer diameter is recessed in the central portion in the axial direction, and large diameter portions 10d and 10d having a larger outer diameter than the small diameter portion 10c are provided at both axial end portions. Yes. There is a step between the small diameter portion 10c and each large diameter portion 10d, and each large diameter portion 10d is formed to have the same outer diameter. The small diameter portion 10c of the collection tube 10 is provided with the above-described collection port 10a.

  The small-diameter portion 10c is recessed in the entire circumference of the outer peripheral surface of the sampling tube 10, functions as a guide groove for guiding the slide of the shutter plate 12, and a slide space 20 (described later with reference to FIGS. 8 and 8). 9)). Further, the shutter plate 12 can be fitted to the outer periphery of the small-diameter portion 10c (see FIG. 9).

  For this reason, the size of the small diameter portion 10c is such that the curvature of the outer peripheral surface is the inner periphery of the shutter plate 12 so that the shutter plate 12 slides smoothly between the sampling tube 10 and the outer tube 11 and the opening / closing operation is performed. It is equal to the curvature of the surface, the axial length is slightly smaller than the axial length of the shutter plate 12 (for example, about 0.5 mm), and the depth is slightly smaller than the thickness of the shutter plate 12 (for example, About 0.8 mm).

  As shown in FIG. 3 (b), each of the large diameter portions 10d of the sampling tube 10 is provided with four fixing screw holes 10e for screwing, and the four fixing screws in each large diameter portion 10d. The holes 10e are provided at equal intervals (90 ° intervals) on the outer periphery of each large-diameter portion 10d. The fixed screw holes 10e in these eight places are female screw holes for screwing the outer tube 11 fitted on the outer periphery of the sampling tube 10.

  As shown in FIG. 3 (c), a point-side connecting hole 10 f is formed in one end portion (tip portion) in the axial direction of the sampling tube 10, and the other end portion (base end portion) in the axial direction of the sampling tube 10. The rod side connecting hole 10g is formed as an opening. The sampling space 10b is communicated with the outside of the sampling tube 10 through the point side connecting hole 10f and the rod side connecting hole 10g.

  The point-side connecting hole 10f is a hole that communicates from the distal end surface of the sampling tube 10 to the sampling space 10b, and a female screw using a fine screw is threaded on the inner peripheral surface thereof. The point side connecting hole 10f has an inner diameter larger than the inner diameter of the sampling space 10b, and the point joint 13 is detachably connected to the point side connecting hole 10f (see FIG. 8).

  The rod side connecting hole 10g is a hole that communicates from the base end surface of the sampling tube 10 to the sampling space 10b, and an internal thread using a fine screw is threaded on the inner peripheral surface thereof, and the point side connection is connected to the internal thread. A fine screw having the same structure as that of the hole 10f (mainly, the nominal diameter, the number of strips, and the pitch are the same) is used. The rod side connecting hole 10g has an inner diameter larger than the inner diameter of the sampling space 10b, and the rod joint 14 is detachably connected to the rod side connecting hole 10g (see FIG. 8).

  4 is a component diagram of the outer tube 11, FIG. 4 (a) is a front view, FIG. 4 (b) is a right side view, and FIG. 4 (c) is a plan view. 4 (d) is a cross-sectional view taken along lines D1-D1 and D2-D2 in FIG. 4 (a). In addition, although illustration is abbreviate | omitted, the left view of the outer cylinder pipe 11 is represented similarly to a right view, and a bottom view is represented similarly to a top view.

  As shown in FIG. 4, the outer tube 11 is formed of a pair of half-cylinders 11b and 11b in a half-cracked state, and these pair of half-cylinders 11b and 11b are combined to form a cylinder. Further, a total of eight through holes 11 c are formed in the pair of semi-cylindrical bodies 11 b and 11 b corresponding to the fixing screw holes 10 e of the sampling tube 10. These through-holes 11c are provided at equal intervals around the outer tube 11 while avoiding the breaks in the pair of semi-cylindrical bodies 11b and 11b.

  As shown in FIG. 4A, the pair of semi-cylindrical bodies 11b and 11b are respectively formed with concave cutout recesses 11d. Further, the outer cylinder opening 11a has a rectangular shape in a plan view formed by connecting the notch recesses 11d and 11d to each other by combining the pair of semi-cylindrical bodies 11b and 11b to form a cylindrical outer cylinder tube 11. It is an opening.

  The outer cylinder opening 11a is formed in a part of the outer peripheral surface of the outer cylinder pipe 11, and communicates with the sampling port 10a when the outer cylinder pipe 11 is fitted and fixed to the sampling pipe 10 with screws. This is an opening that exposes the sampling port 10a to the outside from the center of the outer cylinder opening 11a (see FIGS. 2 and 8).

  The outer tube 11 is provided so as to cover the entire outer periphery of the sampling tube 10 except for the opening portion of the outer tube opening 11a. Here, the opening width in the axial direction of the outer cylinder opening 11a is equal to the opening width in the axial direction of the sampling port 10a and smaller than the axial length of the small diameter portion 10c of the sampling tube 10. Furthermore, the opening width in the circumferential direction of the outer cylinder opening 11a is larger than the opening width in the circumferential direction of the sampling port 10a, and is, for example, about 1/4 times the outer circumference of the outer cylinder tube 11.

  FIG. 5 is a component diagram of the shutter plate 12, in which FIG. 5 (a) is a plan view and FIG. 5 (b) is a front view. As shown in FIG. 5A, the shutter plate 12 is a plate having an arcuate cross-sectional shape that matches a cross-sectional shape of a slide space 20 described later. The shutter plate 12 is slidably accommodated in the slide space 20, and opens and closes the collection port 10a by sliding in the slide space 20 along the outer peripheral surface of the collection tube 10 in the circumferential direction. .

  The shutter plate 12 has an axial length larger than the axial opening width of the sampling port 10a and the outer cylinder opening 11a, and a circumferential length larger than the circumferential opening width of the sampling port 10a and the outer cylinder opening 11a. It has been enlarged. According to this shutter plate 12, the entire outer cylinder opening 11a is closed in the fully closed state, and the entire sampling port 10a is closed, while the entire outer cylinder opening 11a is opened in the fully opened state. And the whole collection port 10a is exposed from the outer cylinder opening 11a. Further, the claw 12a is continuously formed on the shutter plate 12 in the axial direction.

  As shown in FIG. 5 (b), the soil claw 12 a is integrally formed with one end portion in the circumferential direction of the shutter plate 12, and the one end portion in the circumferential direction of the shutter plate 12 with respect to the outer peripheral surface of the shutter plate 12. It is formed by bending into a valley fold so as to form an obtuse angle. For example, the angle α formed by the shutter plate 12 and the soil claw 12a at the bending point P of the soil claw 12a is 135 °.

  6 is a component diagram of the point joint 13, FIG. 6 (a) is a front view, FIG. 6 (b) is a cross-sectional view taken along line BB in FIG. 6 (a), and FIG. (C) is a longitudinal cross-sectional view. As shown in FIG. 6A, the point joint 13 is formed in a truncated cone shape whose outer diameter gradually increases from the distal end side toward the proximal end side. This is to reduce resistance when the drilling point 2 penetrates into the ground.

  The outer diameter of the tip surface of the point joint 13 is equal to or slightly larger than the outer diameter of the root portion of the screw portion 2a of the drilling point 2. In addition, two parallel engaging surfaces 13a and 13a are formed on the outer peripheral surface of the point joint 13 so that a tool such as a spanner is fitted and engaged (see FIG. 6B). Further, the point joint 13 is provided with a screw fitting shaft 13b at a base end portion thereof, and a connecting stepped hole 13c is recessed at a distal end surface thereof.

  The screw fitting shaft 13b of the point joint 13 functions as a lid that closes the point side connecting hole 10f of the sampling tube 10 by being directly and detachably connected to one end of the sampling tube 10 in the axial direction. Specifically, when the screw fitting shaft 13b of the point joint 13 is fitted and screwed into the inner periphery of the point side connecting hole 10f of the sampling tube 10, the point side connecting hole 10f is closed. Further, on the outer peripheral surface of the screw fitting shaft 13b, a male screw using a fine screw adapted to the female screw of the point side connecting hole 10f is screwed.

  Further, when the screw fitting shaft 13b of the point joint 13 is fitted and screwed into the point side connecting hole 10f of the sampling tube 10, the point joint 13 is connected to the sampling tube 10 in a state in which the center axes thereof coincide with each other. Here, the reason why the fine screw is adopted as the male screw of the screw fitting shaft 13b of the point joint 13 is to make it difficult to loosen the screwed state of the point joint 13 and the sampling pipe 10 when the soil sampler 1 rotates in the reverse direction.

  As shown in FIG. 6 (c), the connecting stepped hole 13c of the point joint 13 extends in the axial direction of the point joint 13, and mainly includes a bowl-shaped (conical frustum-shaped) tapered hole portion 13c1. , And a female screw hole 13c2 recessed in the bottom surface of the tapered hole 13c1. The female screw hole 13c2 of the point joint 13 is formed so that a female screw is threaded on the inner peripheral surface thereof and the point connecting screw shaft 5 is fitted and screwed.

  The tapered hole portion 13c1 of the point joint 13 has an inner diameter gradually decreasing from the distal end side to the proximal end side of the point joint 13, and the tapered base portion 2b of the drilling point 2 is fitted into the tapered hole portion 13c1. The

  7 is a component diagram of the rod joint 14, FIG. 7 (a) is a front view, FIG. 7 (b) is a cross-sectional view taken along line BB in FIG. 7 (a), and FIG. (C) is a longitudinal cross-sectional view. As shown in FIG. 7, the rod joint 14 is formed in a truncated cone shape whose outer diameter gradually decreases from the distal end side toward the proximal end side. This is to reduce the resistance when the soil collector 1 is pulled out from the ground after drilling.

  The outer diameter of the base end face of the rod joint 14 is equal to the outer diameter of the rod 3. In addition, two parallel engaging surfaces 14a and 14a to which a tool such as a spanner is fitted and engaged are formed in the outer peripheral surface of the rod joint 14 (see FIG. 7B). Further, the rod joint 14 is provided with a screw fitting shaft 14b at the distal end thereof, and a connecting screw hole 14c is recessed in the base end surface.

  The screw fitting shaft 14b of the rod joint 14 functions as a lid for closing the rod side connection hole 10g of the sampling tube 10 by being directly and detachably connected to the other axial end of the sampling tube 10. . Specifically, when the screw fitting shaft 14b of the rod joint 14 is fitted and screwed into the inner periphery of the rod side connection hole 10g of the sampling tube 10, the rod side connection hole 10g is closed. Further, on the outer peripheral surface of the screw fitting shaft 14b, a male screw using a fine screw adapted to the female screw of the rod side connecting hole 10g is screwed.

  Further, when the screw fitting shaft 14b of the rod joint 14 is fitted and screwed into the rod side connection hole 10g of the sampling tube 10, the rod joint 14 is connected to the sampling tube 10 in a state where the center axes thereof coincide with each other. Here, the reason why the fine screw is employed as the male screw of the screw fitting shaft 14b of the rod joint 14 is to make it difficult to loosen the screwed state between the rod joint 14 and the sampling tube 10 during the reverse rotation of the soil sampler 1.

  As shown in FIG. 7C, the connecting screw hole 14 c of the rod joint 14 extends in the axial direction of the rod joint 14. The connecting screw hole 14c is formed so that a female screw is threaded on the inner peripheral surface thereof, and a rod connecting screw shaft 6 (see FIG. 8) described later is fitted and screwed.

  FIG. 8 is an enlarged view of a part of the mounting portion of the soil sampler 1 in the soil collecting device 100, and FIG. 8A shows the fully closed state of the shutter plate 12. 8 (b) shows the fully open state of the shutter plate 12. FIG.

  As shown in FIG. 8, according to the soil collection device 100, the drilling point 2 and the rod 3 are connected to the distal end portion and the proximal end portion of the soil collection device 1 via the point joint 13 and the rod joint 14. Here, the screw fitting shaft 13b of the point joint 13 is fitted and screwed into the point side connecting hole 10f of the sampling tube 10, and the screw fitting shaft of the rod joint 14 is inserted into the rod side connecting hole 10g of the sampling tube 10. 14b is screwed.

  In this state, the point side connecting hole 10f and the rod side connecting hole 10g on both sides in the axial direction of the sampling space 10b of the sampling tube 10 are closed by the point joint 13 and the rod joint 14, and as a result, the point joint 13 The rod joint 14 functions as a lid for the point side connecting hole 10f and the rod side connecting hole 10g.

  Then, the base end of the drilling point 2 is connected to the point joint 13. The taper base portion 2b at the base end portion of the drilling point 2 is formed in a truncated cone shape whose outer diameter gradually increases from the base end surface toward the screw portion 2a, and the connecting stepped hole 13c of the point joint 13 is formed. Are fitted to the tapered hole portion 13c1.

  Further, the drilling point 2 has the center of the connecting screw hole 2c coincident with the central axis of the screw portion 2a, and the inner peripheral surface of the connecting screw hole 2c is the same as the female screw hole portion 13c2 of the point joint 13. A female thread of construction is threaded. Then, one end of the point connecting screw shaft 5 in the axial direction is screwed into the female screw hole 13c2 of the point joint 13, and the other end in the axial direction of the point connecting screw shaft 5 is connected to the drilling point 2. It is screwed into the screw hole 2c.

  The taper base 2b of the hole drilling point 2 is crimped to the taper hole 13c1 of the point joint 13 by the fastening force associated with the screwing of the point connecting screw shaft 5, and the hole drilling point 2 and the point joint 13 are bonded by this crimping. The degree of coupling is increased.

  In addition, by connecting the drilling point 2 and the point joint 13 with the taper base 2b and the taper hole 13c1 being crimped to each other in this way, the external force acting on the drilling point 2 during drilling is converted to a point connecting screw shaft. 5 can be dispersed not only in the taper base 2b but also the damage of the point connecting screw shaft 5 due to stress concentration can be suppressed.

  On the other hand, the tip of the rod 3 is connected to the rod joint 14. A connecting screw hole 3 a for connecting to the rod joint 14 via the rod connecting screw shaft 6 is recessed in the tip surface of the rod 3. The center of the connecting screw hole 3a of the rod 3 coincides with the central axis of the rod 3, and a female screw having the same configuration as the connecting screw hole 14c of the rod joint 14 is formed on the inner peripheral surface of the connecting screw hole 3a. It is threaded.

  Then, one end side of the rod connecting screw shaft 6 having the same male thread as the point connecting screw shaft 5 is screwed into the connecting screw hole 14 c of the rod joint 14. The other axial end is screwed into the connecting screw hole 3 a of the rod 3. Here, for the rod connecting screw shaft 6, a full screw type stud bolt using the same coarse thread as the point connecting screw shaft 5 is used.

  As shown in FIG. 8 (a), when the shutter plate 12 is in the fully closed state, the soil sampler 1 has the entire outer cylinder opening 11a closed by the shutter plate 12, and the shutter plate 12 covers the entire sampling port 10a. Overlaid. At this time, the shutter plate 12 partitions the outer cylinder opening 11a and the sampling port 10a to prevent soil from entering the sampling space 10b of the sampling tube 10 from the sampling port 10a. This is to prevent soil at an undesired underground depth from being mixed into the collection space 10b.

  As shown in FIG. 8 (b), the outer tube 11 is fitted to the entire outer periphery of the sampling tube 10 so that the sampling port 10 a is exposed from the outer tube opening 11 a in a fully opened state of the shutter plate 12. These are fixed by screws 15 screwed into the fixing screw holes 10e from the through holes 11c. A slide space 20 is provided at the boundary between the outer tube 11 and the sampling tube 10.

  In addition, when there is a problem that the outer tube 11 is detached by being caught in the cracks of the semi-cylindrical bodies 11b, 11b of the outer tube 11 during rotation in the ground, for example, the fixing position by the screw 15 is By providing it in the vicinity of the cracks in the semi-cylindrical bodies 11b and 11b of the outer tube 11, such a problem can be reduced or eliminated.

  The slide space 20 is a space that slidably accommodates the shutter plate 12 in the circumferential direction in a state where the shutter plate 12 is sandwiched between the small-diameter portion 10c of the sampling tube 10 and the inner peripheral portion of the outer tube 11. is there. The slide space 20 is provided between the collection tube 10 and the outer tube 11 with a thickness of, for example, about 2 mm, is continuously formed in the circumferential direction of the soil sampler 1, and communicates with the outer tube opening 11a (see FIG. 9).

  When the shutter plate 12 is fully opened, the partition between the outer cylinder opening 11a and the sampling port 10a is removed, and the sampling port 10a appears in the outer cylinder opening 11a, so that the target predetermined underground depth is reached. At this time, the soil collector 1 is rotated in reverse and the soil in the penetration hole is scraped off by the soil claw 12a, so that the soil can be taken into the sampling space 10b from the sampling port 10a.

  FIG. 9 is a cross-sectional view of the soil sampler 1, in which FIG. 9 (a) shows the shutter plate 12 in the fully closed state along the line IX-IX in FIG. 8 (a). Is the fully opened state of the shutter plate 12 along the line IX-IX in FIG. In FIG. 9A, the forward rotation direction of the soil sampler 1 is illustrated by an arrow, and in FIG. 9B, the reverse rotation direction of the soil sampler 1 is illustrated by an arrow.

  According to the soil sampling device 100 configured as described above, when penetrating the soil sampling device 1 to a predetermined underground depth, the tip of the drilling point 2 connected to the tip portion is thrust into the ground, A rotational force is applied to the rod 6 connected to the base end portion so as to rotate forward about the central axis via the handle 4 or the automatic drilling device.

  Then, the soil collector 1, the drilling point 2 and the rod 3 in the soil sampling apparatus 100 are integrally rotated around the central axis, and the penetration hole is drilled into the ground by the drilling point 2. Then, along with this drilling, the soil collector 1 is moved forward to a predetermined depth in the penetration hole while being rotated around the central axis.

  As shown in FIG. 9A, when the soil collector 1 is rotated forward about the central axis (clockwise on the paper surface of FIG. 9), the soil pawl 12a of the shutter plate 12 has the tip thereof. It extends diagonally toward the reverse rotation direction side opposite to the rotation direction of the soil sampler 1, and the outward slope 12a1 of the soil claw 12a looks like the forward rotation direction side. For this reason, when the soil extractor 1 rotates in the forward direction, the soil in the penetration hole hits the outward slope 12a1 of the clay claw 12a, and the shutter plate 12 receives an external force in the closing direction, so that the shutter plate 12 is fully closed. Is maintained.

  In the shutter plate 12 in the fully closed state, the inwardly inclined surface 12a2 of the claw 12a is bumped to the edge of one end in the circumferential direction of the outer cylinder opening 11a, and further, the shutter plate 12 is closed in the closing direction. Slide movement is restricted. In addition, the shutter plate 12 in the fully closed state has half the circumferential length thereof covering the outer cylinder opening 11 a, and the remaining half is stored in the slide space 20.

  Then, when the soil collector 1 reaches the target predetermined underground depth, the rod 3 is rotated around the central axis through the handle 4 in order to collect the soil in the penetration hole at the underground depth. The rotational force to be applied is applied, and the drilling point 2 and the soil sampler 1 are rotated backward about the central axis.

  As shown in FIG. 9 (b), the soil claw 12a of the shutter plate 12 has its tip in the state where the soil collector 1 is reversely rotated around the central axis (rotated counterclockwise on the paper surface of FIG. 9). Is extended obliquely toward the same reverse rotation direction as the rotation direction of the soil extractor 1, and the inwardly inclined surface 12a2 of the soil claw 12a is directed toward the reverse rotation direction.

  For this reason, when the soil sampling device 1 rotates in the reverse direction, if the soil claw 12a of the shutter plate 12 is caught on the inner peripheral surface of the penetration hole and the soil sampling device 100 is further rotated in the reverse state, the shutter plate 12 is opened. In response to the external force in the direction, the shutter plate 12 is slid from the fully closed position to the open position, and the shutter plate 12 is opened to the fully open state as shown in FIG. 9B.

  In the fully open shutter plate 12, the outwardly inclined surface 12a1 of the clay claw 12a is stopped by the edge of the outer cylinder opening 11a on the other end side in the circumferential direction, and by this stop, the shutter plate 12 is further opened in the opening direction. The sliding movement is restricted, and the shutter plate 12 is prevented from sinking into the slide space 20 due to the resistance received during reverse rotation.

  Further, if the shutter plate 12 of the soil collector 1 is rotated in the reverse direction with the shutter plate 12 fully opened, the soil claw 12a extends from the outer cylinder opening 11a to the outside of the outer cylinder pipe 11, and the tip thereof is the outer cylinder. Since it extends to the outside further from the outer peripheral surface of the pipe 11, the soil scraping claw 12a scrapes the soil from the inner peripheral surface of the penetration hole, and the scraped soil appears from the outer cylinder opening 11a. Through the sampling space 10b.

  After the soil sample is collected, the soil collector 1 is rotated forward again, so that an external force directed toward the closing direction of the shutter plate 12 acts on the soil claw 12a in the penetration hole. As a result, the shutter plate 12 is slid in the closing direction, and the sampling port 10a and the outer cylinder opening 11a are closed again by the shutter plate 12. After the sampling port 10a and the outer cylinder opening 11a are closed, the rod 3 is pulled out from the penetration hole while applying a rotational force to rotate the rod 3 around the central axis, so that the drilling point 2 and soil sampling are performed. The vessel 1 is withdrawn from the penetration hole and collected.

  Thus, when the rod is pulled out, by applying a rotational force to rotate the rod positively around the central axis, the drilling member and soil collector can be rotated forward around the central axis. These can be pulled out from the penetration hole while applying an external force for closing the shutter plate.

  At this time, since the slide space 20 and the collection space 10b are isolated by the collection tube 10, after the soil is collected from the collection port 10a, the soil collector 1 is rotated forward again to move the shutter plate 12 in the closing direction. In this case, the soil accommodated in the collection space 10b is caught on the shutter plate 12, and the opening / closing operation of the shutter plate 12 is not hindered. For this reason, when pulling out the soil collection device 100 from the inside of the penetration hole, it is possible to prevent the shutter plate 12 from being fully closed and the soil at another underground depth from being mixed into the collection space 10b during the extraction.

  In order to take out the soil sample in the collection space 10b of the collection tube 10 after collecting the soil collection device 100 from the penetration hole, the point joint 13 or the rod joint 14 is connected from one end or the base end of the collection tube 10 in the axial direction. By removing, the point side connecting hole 10f or the rod side connecting hole 10g is opened, the sampling space 10b is communicated with the outside, and the soil sample in the sampling space 10b is taken out. The soil sample in the collection space 10b can be taken out from the collection port 10a by sliding the shutter plate 12 in the opening direction to open the collection port 10a and the outer cylinder opening 11a.

  As described above, the point joint 13 itself, which is a joint for the drilling point 2, and the rod joint 14 itself, which is a joint for the rod 3, are used as members for closing both axial ends of the sampling space 10b of the sampling pipe 10. Therefore, the connection structure between the soil sampler 1, the drilling point 2 and the rod 3 can be simplified.

  Next, with reference to FIG. 10, a modified example of the drilling point will be described. The drilling point of Example 2 is obtained by making the drilling point itself a part of the soil collector with respect to the drilling point of Example 1 described above. Hereinafter, in the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

  FIG. 10 is a partially enlarged view of the soil collection device 200 of the second embodiment, and is a partial cross-sectional view of a connection portion between the drilling point 202 and the soil collection device 201. As shown in FIG. 10, the soil collection device 200 is formed not to be a general-purpose drilling point 2 as in the first embodiment but to be directly connectable to the soil collection device 201 without using the point joint 13. A dedicated drilling point 202 is provided.

  The drilling point 202 has a screw portion 202a formed in the same shape as the screw portion 2a of the drilling point 2 of the first embodiment. The whole drilling point 202 is formed of a hardenable steel material such as a chromium molybdenum steel material. In particular, the screw portion 202a is carburized and quenched on its surface, and its quenching depth is 1 mm. Rockwell hardness C scale (HRC) of 60 or more.

  Further, in the drilling point 202, a screw fitting shaft 202b is integrally formed on the base end surface of the screw portion 202a, instead of the point connecting screw shaft 5 described above. The screw fitting shaft 202b is enhanced in toughness by a carbon-proof treatment, and is a fine screw-like male screw having the same thread size as the screw fitting shaft 13b of the point joint 13 described above. Through this screw fitting shaft 202b, the drilling point 202 is directly fitted and screwed to the inner periphery of the point side connecting hole 10f of the sampling tube 10.

  As described above, according to the soil collection device 200, the screw fitting shaft 202b of the drilling point 202 is used as a lid that closes the point-side connection hole 10f of the sampling tube 10. Therefore, the point-side connection hole is formed by the drilling point 202. 10f can be closed directly. Therefore, it is not necessary to prepare the point joint 13 separately, and the connection structure between the soil sampler 201 and the drilling point 202 can be simplified.

  Moreover, the screw fitting shaft 202b is integrated with the drilling point 202 and has improved toughness due to the carbon-proof treatment, and the outer diameter of the screw fitting shaft 202b is less than the outer diameter of the sampling tube 10, but the Since it has a large size exceeding the inner diameter, it has high durability against twisting due to rotation in the ground, and as a result, it is possible to further suppress the situation where stress concentration occurs on the screw fitting shaft 202b and the drilling point 202 is damaged.

  Next, another modification example of the drilling point will be described with reference to FIG. The drilling point of Example 3 is obtained by changing the main body portion to a pyramidal pointed portion with respect to the screw portion of the drilling point of Example 2 described above. Hereinafter, in Example 3, the same code | symbol is attached | subjected to the part same as Example 2, the description is abbreviate | omitted, and only a different part is demonstrated.

  FIG. 11 is a component diagram of the drilling point 302 of Example 3, FIG. 11A is a front view, FIG. 11B is a bottom view, and FIG. 11C is FIG. FIG. 11A is an end view taken along line CC of FIG. 11A, and FIG. 11D is an end view taken along line DD of FIG. The rear view and the left and right side views of the drilling point 302 are both expressed in the same manner as the front view. FIG. 11A illustrates the connection state between the drilling point 302 and the sampling tube 10 by illustrating the sampling tube 10 and the outer tube 11 using imaginary lines (two-dot chain lines). .

  As shown in FIG. 11, the drilling point 302 includes a pyramid pointed portion 302 a having a sharp tip. The entirety of the drilling point 302 is formed of a hardenable steel material such as a chromium molybdenum steel material. In particular, the pointed portion 302a is carburized and quenched on its surface, and its quenching depth is 1 mm. The surface has a Rockwell hardness C scale (HRC) of 60 or more.

  The same screw fitting shaft 202b as that of the second embodiment is integrally formed on the base end surface of the pointed portion 302a. The screw fitting shaft 202b is directly fitted and screwed into the inner periphery of the point side connecting hole 10f of the sampling tube 10, and is used to connect the drilling point 302 and the sampling tube 10 to each other.

  As shown in FIG. 11 (a) to FIG. 11 (c), the pointed portion 302a has a sharp-pointed pyramid shape, so that the soil is scraped away by a plurality of corner portions 302a1 on the outer periphery thereof. Drilling can be done. Moreover, since the pointed portion 302a is not twisted and constricted like the screw portions 2a and 202a of Example 1 or 2, the frictional resistance force from the soil during drilling and penetration into the ground. It is hard to break even if you receive it.

  In addition, the pointed portion 302a has a sharp pyramid shape whose thickness (outer diameter) gradually decreases from the base end portion to the tip end portion, so that, for example, the drilling point 302 is struck into a hard portion of the ground. Even if a load is applied such as dripping or piercing, it is difficult to break and easily penetrates into the ground. Further, the tip angle β of the pointed portion 302a is formed larger than the angle γ of the main body portion of the pointed portion 302a, and it is difficult to break even if it receives frictional resistance from soil due to drilling and penetration. It has become.

  Further, the pyramidal cusp 302a is shown in the end view of FIG. 11 (d) by chamfering the outer peripheral surface of the base end side (the lower side of FIG. 11 (a)) into a cylindrical surface shape. Thus, a part of the outer peripheral surface is an arc-shaped curved surface 302a2.

  Moreover, the base end portion of the pointed portion 302a where such a curved surface 302a2 is formed on the outer peripheral surface is a portion having the largest outer diameter in the pointed portion 302a, and the outer diameter thereof is that of the outer tube 11. It is larger than the outer diameter. Thus, when the outer diameter of the base end portion of the drilling point 302 is larger than the outer tube 11, the soil collector 301 connected to the distal end of the drilling point 302 has a distal end surface of the sampling tube 10 when penetrating into the ground. Soil is prevented from being caught on the ground, and resistance to penetration into the ground is reduced.

  Next, a modification of the outer tube will be described with reference to FIG. The outer tube of the fourth embodiment is obtained by changing the dividing position of the pair of semi-cylindrical bodies with respect to the outer tube of the first embodiment. Hereinafter, in Example 4, the same code | symbol is attached | subjected to the part same as Example 1, the description is abbreviate | omitted, and only a different part is demonstrated.

  FIG. 12 is a component diagram of the outer tube 411 of the fourth embodiment, in which FIG. 12 (a) is a front view, FIG. 12 (b) is a right side view, and FIG. 12 (c) is a plan view. It is. In addition, although illustration is abbreviate | omitted, the left view of the outer cylinder pipe 11 is represented similarly to a right view, and a bottom view is represented similarly to a top view.

  As shown in FIG. 12, the outer tube 411 is formed of a pair of half-cylinders 411b and 411b in a half-cracked state, and the pair of half-cylinders 411b and 411b is combined to form a cylinder. Further, the outer cylinder opening 11a is formed in only one of the pair of semi-cylindrical bodies 411b and 411b, and is provided at a location avoiding the cracks between the semi-cylindrical bodies 411b.

  Thus, by providing the outer cylinder opening 11a while avoiding the cracks of each semi-cylindrical body 411b, when the cutout recess 11d that becomes the outer cylinder opening 11a is distributed to each semi-cylindrical body 11b as in the first embodiment, In comparison, the problem that the outer tube 411 is detached by being caught in the cracks of the semi-cylindrical bodies 411b and 411b during rotation in the ground is reduced or eliminated.

  Next, a modification of the rod joint will be described with reference to FIG. The rod joint of the fifth embodiment is obtained by changing the shape of the outer peripheral surface of the rod joint of the first embodiment described above and integrally forming a connecting screw shaft instead of the point connecting screw shaft in the rod joint. Hereinafter, in the fifth embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

  FIG. 13 is a component diagram of the rod joint 514 of Example 5, in which FIG. 13 (a) is a front view, FIG. 13 (b) is a plan view, and FIG. 13 (c) is a bottom view. FIG. 13 (d) is a partially sectional front view showing the connection state between the rod 3 and the sampling tube 10. In addition, although illustration is abbreviate | omitted, the rear view of the rod coupling 514, the right view, and the left view are represented similarly to the front view.

  As shown in FIG. 13 (a), the rod joint 514 is formed in a truncated cone shape whose outer diameter gradually decreases from the distal end side toward the proximal end side, and the front surface and the rear surface of the outer circumferential curved surface of the conical surface shape. The left and right both sides are notched and removed from the distal end side to the proximal end side of the rod joint 514, so that a total of four surfaces including the front surface, the rear surface, and the left and right surfaces are flat inclined surfaces 514a (see FIG. 13B). .)

  By providing the four flat slopes 514a in this way, a plurality of corner portions 514b are provided on the outer peripheral surface of the rod joint 514. When the soil collector 501 is rotated, the rod joint 514 can scrape away the soil in the penetration hole by the plurality of corner portions 514b.

  For example, even if the soil sampler 501 is buried in the soil (especially sandy soil) in the penetration hole after entering the ground, the soil sampler 501 is rotated (forward) via the rod 3. Thus, the soil sampler 501 can be smoothly pulled out from the penetration hole while scraping such soil with the rod joint 514.

  Further, the four flat slopes 514a formed on the outer peripheral surface of the rod joint 514 have a parabolic outline whose width gradually increases from the distal end side to the proximal end side of the rod joint 514 when viewed from the front. ing. And as shown in FIG.13 (b), the base end surface of the rod joint 514 becomes a square shape in planar view by forming these four flat slopes 514a.

  A rod connection screw shaft 514 c is integrally formed on the base end surface of the rod joint 514 instead of the separate rod connection screw shaft 6. The rod connecting screw shaft 514c is a coarse thread male screw having the same configuration as the rod connecting screw shaft 6, and can be screwed into the connecting screw hole 3a at the tip of the rod 3 (FIG. 13). (See (d).)

  The length of one side of the square base end face of the rod joint 514 is equal to the outer diameter of the rod 3. In addition, since a tool such as a spanner can be externally engaged on the flat inclined surface 514a of the rod joint 514, it is not necessary to separately form an engagement surface for engaging the tool.

  The present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various improvements and modifications can be easily made without departing from the spirit of the present invention. It can be guessed.

  For example, in Example 1 described above, the point connecting screw shaft 5 that is a separate member from the drilling point 2 is used as the connecting means between the drilling point 2 and the point joint 13. The connecting means is not necessarily limited to this, and a shaft portion having a male screw having the same configuration as that of the point connecting screw shaft 5 is integrally formed on the base end surface of the taper base portion of the drilling point, and the shaft having this male screw is formed. You may make it connect a drilling point to the point coupling 13 through a part. Alternatively, a shaft portion having a male screw having the same configuration as that of the point connecting screw shaft 5 is formed integrally with the tip end portion of the point joint 13, and the drilling point is connected to the point joint 13 through the shaft portion having the male screw. May be.

  Moreover, in the said Examples 1-4, although the rod connection screw shaft 6 was used as a connection means of the rod 3 and the rod joint 14, the connection means of this rod and the rod joint 14 is not necessarily limited to this. Instead, as in the fifth embodiment, a shaft portion having a male screw having the same configuration as that of the rod connecting screw shaft 6 is integrally formed on the tip surface of the rod, and the rod is connected to the rod joint through the shaft portion having the male screw. 14 may be connected.

  In the first to third embodiments, the rod connecting screw shaft 6 is fitted and screwed into both the connecting screw hole 3a of the rod 3 and the connecting screw hole 14c of the rod joint 14, so that the rod 3 and the rod joint 14 are engaged. Further, the rod fitting shaft 14b of the rod joint 14 is fitted and screwed into the rod side connecting hole 10g of the sampling tube 10, whereby the rod 3 and the soil collectors 1, 201, 301 are connected. Configured to be.

  However, the connecting means between the rod 3 and the soil collectors 1, 201, 301 is not necessarily limited to this. For example, a screw fitting shaft is directly formed integrally with the tip of the rod, and the rod is screwed. By forming a fine screw having the same configuration as the screw fitting shaft 14b of the rod joint 14 on the outer peripheral surface of the shaft, and fitting the screw fitting shaft of the rod itself directly into the rod side connection hole 10g of the sampling tube 10, The rod and the sampling tube 10 may be connected.

  In this case, the screw fitting shaft formed integrally with the distal end portion of the rod is a lid that closes the rod side connection hole 10g of the sampling tube 10 (the base end formed integrally with the distal end portion of the rod according to claim 2). Therefore, the rod side connection hole 10g of the sampling tube 10 can be directly closed using a rod, the rod joint 14 is not necessary, and the rod connection means can be simplified.

  Moreover, in addition to being integrated into the rod itself, the rod fitting shaft of this rod is a large size whose outer diameter is smaller than the outer diameter of the sampling tube 10 but exceeds the inner diameter of the sampling space 10b. Durability against torsion associated with rotation in the ground is enhanced, and stress concentration on the screw fitting shaft is prevented from damaging the connecting portion between the rod and the sampling tube 10.

1 Soil Sampler 2 Drilling Point (Drilling Member with Base End Connectable to Tip Lid Member)
2b Taper base (base end of drilling member)
3 Rod (Rod having a tip that can be connected to the base cover member)
5 point connecting screw shaft (connecting means between drilling member and tip cover member)
6 Rod connecting screw shaft (connecting means between rod and base end cover member)
10 sampling tube 10a sampling port 10b sampling space 10f point side connecting hole (tip hole)
10g Rod side connecting hole (base end hole)
11 Outer tube 11a Outer tube opening 11b, 11b Semi-cylindrical body 11d, 11d Notch recess 12 Shutter plate 12a Scraping claw 13 Point joint 13b Screw fitting shaft (tip lid member)
14 Rod joint 14b Screw fitting shaft (base end cover member)
100, 200 Soil sampling device 201 Soil collector 202 Drilling point (a drilling member in which a distal end lid member is integrally formed at a base end)
202b Screw fitting shaft (tip lid member)
301 Soil Sampler 302 Drilling Point (Drilling Member with Tip Lid Integrally Formed at Base End)
411 Outer tube 411b, 411b Semi-cylindrical body 501 Soil extractor 514 Rod joint 514c Rod connecting screw shaft (connecting means between rod and base end cover member)

Claims (3)

A drilling member can be connected to the distal end and a rod can be connected to the proximal end. By rotating the rod forward about the central axis, the penetration hole is drilled into the ground by the drilling member. In the soil collector used to collect and store the soil in the penetration hole by the rod rotating backward around the central axis at a subsurface depth of
A sampling tube formed in a tubular body having a sampling space for accommodating the soil in the penetration hole in the inner periphery;
A tip hole formed in an opening in communication with the sampling space at one axial end of the sampling tube;
The distal end hole is closed by detachably connecting directly to one axial end portion of the sampling tube having the distal end hole, and the base end portion of the drilling member is formed to be connectable, or A distal end lid member formed integrally with the base end of the member;
A sampling port provided in communication with the sampling space on the outer periphery of the sampling tube to which the tip lid member is connected, and for taking in soil into the sampling space;
An outer tube that is fitted and fixed to the outer periphery of the sampling tube having the sampling port;
An outer cylinder opening that is formed in a part of the outer periphery of the outer tube and communicates with the sampling port to expose the sampling port to the outside,
A shutter plate that is sandwiched between an outer peripheral portion of the sampling tube and an inner peripheral portion of the outer tube in order to open and close the outer tube opening and the sampling port, and is slidable in the circumferential direction;
Provided at one end of the shutter plate in the circumferential direction, extends outward from the outer peripheral surface of the outer tube through the opening of the outer tube, and external force in the closing direction of the shutter plate in the penetration hole by the positive rotation of the sampling tube And a soil claw for scraping off the soil in the through hole by receiving an external force in the opening direction of the shutter plate in the through hole by reverse rotation of the sampling tube.   In addition to the distal end hole and the distal end lid member, or in place of the distal end hole and the distal end lid member, a proximal end hole that is formed to open in communication with the sampling space at the other axial end of the sampling tube; The base end hole is closed by detachably connecting directly to the other axial end of the sampling tube having the base end hole, and the tip end of the rod is connectable. The soil collector according to claim 1, further comprising a base end lid member formed integrally with the distal end portion.   3. The soil according to claim 1, wherein the outer tubular tube has a cylindrical shape that can be fitted on the outer periphery of the sampling tube by combining a pair of half-cylinders in a half-cracked state. Collector.

Images