JP7584795B2 - Coring and drilling equipment - Google Patents

Description

The present invention relates to a core sampling device and a boring device.

Patent Document 1 discloses a core sampling device that can measure the inclination of a core sampled from the ground. In the core sampling device of Patent Document 1, as the moving part moves upward, one of the inclination measurement part body and the rotation restriction part is pushed by the moving part and moves to the other side, and the rotating body is sandwiched between the inclination measurement part body and the rotation restriction part, and the rotation of the rotating body is restricted, thereby measuring the inclination of the core.

Patent No. 6685471

As a result of intensive research and development, the inventors of the present application have invented a core sampling device that can more reliably measure the inclination of a core by pressing either the inclination measuring unit body or the rotation regulating unit of the inclination measuring unit, with a configuration different from that of Patent Document 1.

The present invention aims to provide a core sampling device that can reliably measure the inclination of a core, and a boring machine equipped with the same.

The core sampling device comprises a core sampling device main body that is attached to the rod of a boring device and samples a core inside while excavating the ground, a case that can be attached and detached inside the core sampling device main body, a moving part that can move up and down inside the core sampling device main body, at least one inclination measurement part that is provided in the case and measures the inclination of the core sampling device main body, and an extrusion unit that is provided in the core sampling device main body and has an extrusion part. The inclination measurement part comprises a inclination measurement part main body, a rotating body, and a rotation regulating part. The rotating body is provided in the inclination measurement part main body or the rotation regulating part so as to be rotatable around the rotation axis. The inclination measurement part main body and the rotation regulating part face each other in a direction parallel to the rotation axis of the rotating body, and the inclination measurement part main body or the rotation regulating part is movable in a direction parallel to the rotation axis of the rotating body. As the moving part moves upward, the pushing part is pushed towards the inclination measurement part, and one of the inclination measurement part body and the rotation regulation part is pushed by the pushing part and moves to the other side, and the rotating body is sandwiched between the inclination measurement part body and the rotation regulation part, regulating the rotation of the rotating body.

The core sampling device may have a push-out section that is bendable or curved, and bends or curves toward the inclination measurement section as the moving section moves upward to push one of the inclination measurement section main body and the rotation restriction section. In this case, the push-out section may be equipped with a bendable or curveable mechanism, or may be made of a flexible member that is bendable or curved.

The core sampling device may also include a tilt measurement unit in which the rotation axis of the rotor is parallel to the horizontal direction and the rotation axis of the rotor is parallel to the vertical direction, the push-out unit is disposed in the case above the moving unit, and includes a support supporting the push-out unit, the moving unit is inserted into the case, and includes a moving unit space into which the support is inserted from above in the vertical direction, a first push unit that pushes the push-out unit as the moving unit moves upward, and a second push unit that pushes the support as the moving unit moves upward, the first push unit being located above the second push unit, and the push-out unit being pushed by the first push unit to bend or curve in a substantially horizontal direction. In this case, the tilt measurement unit in which the rotation axis of the rotor is parallel to the horizontal direction is located horizontally outward of the push unit, and one of the tilt measurement unit main body and the rotation regulating unit is pushed by the push-out unit as the moving unit moves upward. In addition, the tilt measurement unit, whose rotation axis of the rotating body is parallel to the vertical direction, is located above the support, and as the moving part moves upward, one of the tilt measurement unit main body and the rotation restriction part is pressed against the support.

The core sampling device may also be provided with a first mounting section on the support that is movable in the vertical direction relative to the support, a second mounting section above the first mounting section that is movable in the vertical direction relative to the support, and a movement restriction section that restricts the movement of the second mounting section upward from a predetermined position, a pushing section connected to the first mounting section and the second mounting section, and a first pushing section that supports the first mounting section and pushes the first mounting section as the moving section moves upward.

The extrusion section may include two extrusion members connected to be rotatable around the horizontal direction, one of the extrusion members being connected to the first mounting section to be rotatable around the horizontal direction, and the other extrusion member being connected to the second mounting section to be rotatable around the horizontal direction.

The extrusion unit may also have multiple extrusion sections arranged around a predetermined direction. Multiple extrusion sections may be provided around the support in the up-down direction (circumferential direction of the side periphery of the support).

The pushing portion may be an elastic body on which a restoring force acts so as not to bend or curve the pushing portion. The pushing unit may include an elastic body on which a restoring force acts so as not to bend or curve the pushing portion. The pushing unit may include an elastic body between the first mounting portion and the second mounting portion. The elastic body may be a coil spring through which a support is passed.

The core final device may be provided with a core contact part that is supported by the core collection device body below the case inside the core collection device body. The core contact part may be heavy enough to resist the core entering the core collection device body, movable in the vertical direction, and have a through-hole that penetrates in the vertical direction, with a moving part that is passed through the through-hole so as to be movable in the vertical direction. The case and the core contact part may be connected so as not to rotate together.

The boring device is equipped with the above-mentioned core sampling device.

The core sampling device and the boring machine equipped with it can reliably measure the inclination of the core.

FIG. 2 is a vertical cross-sectional view of the core sampling device as viewed from the left and right. FIG. 2 is an enlarged view showing the lower side of the core sampling device of FIG. 1 . 3 is a cross-sectional view taken along line III-III in FIG. 1. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 4 is a plan view showing a first tilt measurement unit. FIG. 4 is a side view showing the first tilt measurement unit. 7 is a cross-sectional view taken along line VII-VII of FIG. 5. 8 is a diagram showing the inclination measurement unit as viewed from line VIII-VIII in FIG. 5. 6 is a diagram showing the rotation restricting portion as viewed from the line IX-IX in FIG. 5. 11 is a cross-sectional view showing a state in which a rotation restriction portion of the first tilt measurement portion is fixed to a tilt measurement portion main body. FIG. FIG. 2 is an enlarged cross-sectional view showing the lower side of the core sampling device during core sampling. FIG.

The following describes an embodiment of the present invention with reference to the drawings. As shown in FIG. 1, the core sampling device comprises a core sampling device main body 1, a support section 30, a case 40, an inclination measurement section, a moving section 60, and a push-out unit 70. In the following description, for the sake of convenience, the longitudinal direction of the core sampling device main body 1 (the axial direction of the tube) is defined as the up-down direction, one direction perpendicular to the up-down direction is defined as the front-rear direction, and a direction perpendicular to the up-down direction and the front-rear direction is defined as the left-right direction.

In this embodiment, the core sampling device main body 1 is a double core tube, and as shown in Figures 1 to 4, it has an outer tube 10 and an inner tube 20.

The outer pipe 10 includes an outer pipe body 12, an outer pipe head 14, a bit 16, and a connecting rod 18. The outer pipe body 12 is a circular pipe (cylinder). The outer pipe head 14 is attached to the upper end of the outer pipe body 12 and closes the upper opening of the outer pipe body 12. The outer pipe head 14 is detachable from the outer pipe body 12. The outer pipe head 14 also includes a detachable portion 14a for attaching and detaching the rod 176 of the boring device 170 coaxially with the outer pipe body 12. The outer pipe head 14 is provided with a flow path 15 that leads to the inside of the rod 176. The bit 16 is for boring the ground while boring the ground and hollowing out the core C from the ground. The bit 16 is cylindrical and detachably attached to the lower end of the outer pipe body 12. The connecting rod 18 is cylindrical and extends downward from the bottom surface of the outer pipe head 14 inside the outer pipe 10. The outer tube 10 rotates around its central axis (vertical direction) as the axis of rotation in conjunction with the rotation of the rod 176 of the boring device 170.

The inner tube 20 includes an inner tube body 22, an inner tube head 24, and a core lifter 26. The inner tube body 22 is a circular tube (cylinder) and its outer diameter is smaller than the inner diameter of the outer tube body 12. The inner tube body 22 is arranged in the outer tube 10 coaxially with the outer tube body 12 with a gap between them. The inner tube head 24 is attached to the upper end of the inner tube body 22 and closes the upper opening of the inner tube body 22. The inner tube head 24 is detachable from the inner tube body 22. The inner tube head 24 is connected to the connecting rod 18 via a bearing 28 and supported by the outer tube head 14. The inner tube head 24 is detachable from the connecting rod 18. The bearing 28 prevents the inner tube 20 from rotating with the rotation of the rod 176 and the outer tube 10. The gap between the inner pipe 20 and the outer pipe 10 is connected to the flow passage 15 of the outer pipe head 14 and the inside of the rod 176. Liquid supplied from the boring device 170 through the inside of the rod 176 to cool the bit 16 of the core sampling device main body 1 is sent to the bit 16 through the flow passage 15 of the outer pipe head 14 and the gap between the outer pipe main body 12 and the inner pipe main body 22, and is discharged from the opening at the lower end of the core sampling device main body 1. The core lifter 26 is for preventing the core C sampled in the inner pipe 20 from falling out. The core lifter 26 is a cylindrical member made of an elastic body 90, and is capable of expanding and contracting in the radial direction by elastic deformation. The core lifter 26 is supported by the side surface of the inner pipe main body 22 near the lower end thereof.

The core sampling device main body 1 may be something other than a double core tube, such as a single tube.

As shown in Figures 1 to 4, the support part 30 is disposed within the core sampling device main body 1 (inner tube 20) and includes a core contact part 34 and a support part main body 32.

The core contact portion 34 is generally cylindrical. In this embodiment, the core contact portion 34 is made of metal, and its weight is such that it acts as a weight on the core C collected in the core collecting device main body 1 (inner tube 20) and prevents the core C from becoming disarrayed or disintegrating. The diameter of the core contact portion 34 is equal to or smaller than the inner diameter of the inner tube main body 22. The core contact portion 34 has a through-hole 36 that penetrates in the vertical direction around its central axis. A water-stopping portion (not shown) is provided in the through-hole 36 to close the gap with the moving portion 60 that passes through it and to support the moving portion 60 so that it can move in the vertical direction. Here, a rubber or resin O-ring is used as the water-stopping portion.

By providing the core contact portion 34, the core contact portion 34 comes into contact with the head of the core C collected in the core collection device main body 1 (inner tube 20) and prevents the core C from becoming disorganized or collapsing, allowing a high-quality core C to be collected.

The support body 32 is cylindrical, with an open lower end and a wall blocking the upper end. The support body 32 is made of a transparent material such as transparent resin so that the inside can be seen. The outer diameter of the support body 32 is approximately the same as the diameter of the core contact portion 34. The lower end of the support body 32 is detachably attached to the top of the core contact portion 34. The opening at the lower end of the support body 32 is blocked by the core contact portion 34.

The support part 30 is supported by the core sampling device main body 1 so as to be movable in the vertical direction with its axis parallel to the vertical direction within the core sampling device main body 1. In the initial state (hereinafter referred to as the "initial state") before the core C is sampled, the core contact part 34 is sandwiched between the core lifter 26 of the core sampling device main body 1 and the support part 30 is supported so as to be movable in the vertical direction within the core sampling device main body 1. The support part 30 is detachable from the core lifter 26. In the initial state, it is preferable that the lower end side of the core contact part 34 protrudes downward from the core sampling device main body 1. In this way, disturbance and collapse of the core C can be further suppressed, and a better quality core C can be sampled. When the ground is excavated to sample the core C (hereinafter referred to as "when the core C is sampled"), the support part 30 is pushed upward by the core C entering the core sampling device main body 1, and when it comes out of the core lifter 26, it is supported by the core C.

The support part 30 may be supported within the core sampling device body 1 so as to be movable in the vertical direction and detachable by a configuration of the core sampling device body 1 other than the core lifter 26.

As shown in Figures 1, 2 and 4, the case 40 is cylindrical, and the upper and lower ends are closed by upper and bottom walls. The case 40 is made of a transparent material such as transparent resin. A first case hole 41 is provided in the center of the bottom wall of the case 40, which penetrates from the inside to the outside and allows the moving part 60 to pass through. The case 40 is provided inside the support body 32, and is coaxially connected to the core contact part 34 via a case bearing 50, which is a bearing. The case 40 is located above the core contact part 34.

The case bearing 50 is a ball bearing and comprises, in order from outside to inside, an outer ring 52, a middle ring 54, and an inner ring 56. The outer ring 52, middle ring 54, and inner ring 56 are each rotatable about an axis parallel to the vertical direction by balls 58 provided between them. The case bearing 50 is coaxial with the core contact portion 34 and the case 40, with the outer ring 52 connected to the core contact portion 34 and the middle ring 54 connected to the case 40. Therefore, the case 40 can rotate in the vertical direction relative to the core contact portion 34, but cannot rotate together with it.

The case 40 is provided with a weight portion 48 to shift the center of gravity of the case 40 from the axis. The weight portion 48 extends in the vertical direction behind the axis of the case 40 on the outer side surface of the case 40. The weight portion 48 is sufficiently heavy compared to one or more inclination measurement units provided on the case 40, for example, made of metal. By making the weight portion 48 sufficiently heavier than the inclination measurement unit, the shift of the center of gravity of the case 40 from the axis is controlled by the weight portion 48. Since the case 40 can rotate around the vertical direction relative to the core contact portion 34 and the case 40 is provided with the weight portion 48, when the vertical direction (longitudinal direction) of the core sampling device main body 1 is inclined with respect to the direction of gravity during core sampling, the case 40 rotates with respect to the core contact portion 34 so that the weight portion 48 is located on the lower side of the direction of gravity. In this way, no matter how the core sampling device main body 1 is tilted, the position of the case 40 can be kept constant, so the rotation axis of the rotor 144 of the tilt measurement unit, which will be described later, can be kept in a constant direction.

In addition, the case 40 may be made of a non-transparent material if the inclination measurement unit is provided on the outside of the case 40. Furthermore, the weight unit 48 may be made of any material, have any shape, and be provided at any location on the case 40, as long as it shifts the center of gravity of the case 40 from the axis.

As shown in FIG. 1 and FIG. 2, three tilt measuring units are provided in the case 40 as the first tilt measuring unit 110, the second tilt measuring unit 120, and the third tilt measuring unit 130. The first tilt measuring unit 110, the second tilt measuring unit 120, and the third tilt measuring unit 130 each include a tilt measuring unit main body 142, a rotating body 144, and a rotation restricting unit 146. The first tilt measuring unit 110 is provided in the case 40 so that the rotation axis of the rotating body 144 is parallel to the front-rear direction. The second tilt measuring unit 120 is provided in the case 40 so that the rotation axis of the rotating body 144 is parallel to the left-right direction. The third tilt measuring unit 130 is provided in the case 40 so that the rotation axis of the rotating body 144 is parallel to the up-down direction. Below, with reference to FIG. 1, FIG. 2, and FIG. 4 to FIG. 10, the common points of each tilt measuring unit will be collectively described based on the first tilt measuring unit 110, and the differences will be individually described.

The tilt measurement unit main body 142 is fixed in the case 40. The tilt measurement unit main body 142 has a base 142a, a recess 142e, and an insertion portion 142f. The base 142a of the tilt measurement unit main body 142 has an opposing surface 142b that faces the rotation restriction portion 146, a fixed surface 142c that faces the opposing surface 142b, and a side surface 142d that connects the opposing surface 142b and the fixed surface 142c. The opposing surface 142b of the base 142a of the tilt measurement unit main body 142 has a substantially square shape. The opposing surface 142b of the base 142a of the tilt measurement unit main body 142 has a concave recess 142e. The recess 142e is provided in a ring shape around the center of the opposing surface 142b. In addition, a fitting portion 142f is provided at the center of the opposing surface 142b of the base 142a of the inclination measurement unit main body 142. The fitting portion 142f has a fitting hole 142g and a narrow portion 142h. The fitting hole 142g extends from the opposing surface 142b of the base 142a to the fixed surface 142c in a direction parallel to the rotation axis of the rotating body 144. The narrow portion 142h protrudes in a ring shape from the peripheral wall of the fitting hole 142g toward the center at the opening of the fitting hole 142g, narrowing the cross section (width) of the opening of the fitting hole 142g. In addition, the base 142a has a through hole 142i that is a hole that connects between the fitting hole 142g and the fixed surface 142c.

The base 142a of the tilt measurement unit main body 142 is provided with a scale 142j that displays the rotation angle of the rotating body 144. The scale 142j is composed of scale lines corresponding to the rotation angle of the rotating body 144 and numerical values of the rotation angle. In this embodiment, scale lines are displayed on the bottom surface of the recess 142e, and numerical values are displayed on the opposing surface 142b of the base 142a of the tilt measurement unit main body 142. The scale 142j also includes a reference scale 142k that indicates a reference direction. The reference scale 142k is composed of, for example, scale lines indicating the front-rear direction, left-right direction, or up-down direction, and numerical values such as 0° and 90°. The base 142a of the tilt measurement unit main body 142 is formed of a transparent material such as a transparent synthetic resin so that the rotating body 144 and the scale 142j can be easily viewed from outside the tilt measurement unit.

The fixing surface 142c of the base 142a of the inclination measurement unit main body 142 is a curved surface that follows the inner side surface of the case 40 in the first inclination measurement unit 110 and the second inclination measurement unit 120, and is a square flat surface parallel to the opposing surface 142b in the third inclination measurement unit 130. In the first inclination measurement unit 110, the fixing surface 142c of the base 142a of the inclination measurement unit main body 142 is fixed to the inner side surface of the case 40 on the horizontal outside of the extrusion unit 70 described later, in front of the extrusion unit 70 here, so that the longitudinal direction of the through hole 142i is parallel to the front-rear direction. The second tilt measurement unit 120 is fixed to the inner side circumferential surface of the case 40 on the horizontal outer side of the extrusion unit 70, here on the side of the extrusion unit 70, so that the longitudinal direction of the through hole 142i is parallel to the left-right direction. The third tilt measurement unit 130 is fixed to the center of the inner upper surface of the case 40 on the upper side of the support 71 of the extrusion unit 70 described later, so that the longitudinal direction of the through hole 142i overlaps with the axis of the case 40. In the case 40, a second case hole 42 is provided on the extension line of the through hole 142i of each tilt measurement unit, penetrating the inside and outside of the case 40 and communicating with the through hole 142i.

The rotating body 144 is spherical, and its size is such that the entire body fits within the recess 142e. The rotating body 144 can rotate in a circular direction within the recess 142e around the center of the tilt measurement unit main body 142 (opposing surface 142b), in other words, the center of the ring of the recess 142e, as the rotation axis. Here, the rotation of the rotating body 144 means the rotation or movement (turning) of the rotating body 144 around the rotation axis. In the first tilt measurement unit 110, the rotating body 144 rotates around the front-rear direction as the rotation axis, in the second tilt measurement unit 120, the rotating body 144 rotates around the left-right direction as the rotation axis, and in the third tilt measurement unit 130, the rotating body 144 rotates within the annular recess 142e around the up-down direction as the rotation axis. Note that the rotating body 144 does not have to fit entirely within the recess 142e, and a part of it may fit within the recess 142e.

The rotation restricting portion 146 faces the inclination measuring portion main body 142 on the inner side of the inclination measuring portion main body 142 in the rotation axis direction of the rotating body 144. The rotation restricting portion 146 has a base 146a, a convex portion 146e, and a fitting portion 146f. The base 146a of the rotation restricting portion 146 has an opposing surface 146b that faces the inclination measuring portion main body 142, a pressed surface 146c that faces the opposing surface 146b, and a side peripheral surface 146d that connects the opposing surface 146b and the pressed surface 146c. The opposing surface 146b of the base 146a of the rotation restricting portion 146 has a substantially square shape. The opposing surface 146b of the base 146a of the rotation restricting portion 146 has a convex convex portion 146e that fits into the concave portion 142e of the inclination measuring portion main body 142. The convex portion 146e is provided in a ring shape around the center of the opposing surface 146b. In addition, a fitting portion 146f is provided at the center of the opposing surface 146b of the base portion 146a of the rotation restricting portion 146, which is detachably fitted into the fitting portion 142f of the tilt measuring portion main body 142. The fitting portion 146f of the rotation restricting portion 146 includes a fitting portion main body 146g and a head portion 146h. The fitting portion main body 146g is columnar and extends in the rotation axis direction from the opposing surface 146b of the base portion 146a. The head portion 146h is approximately conical, and its bottom surface is coaxially connected to the tip of the fitting portion main body 146g. The cross section of the fitting portion main body 146g is smaller than the cross section of the opening of the fitting hole 142g of the tilt measuring portion main body 142. The bottom surface of the head 146h is larger than the cross section of the fitting body 146g and the cross section of the opening of the fitting hole 142g, but smaller than the cross section of the fitting hole 142g. The head 146h is provided with a rod-shaped fitting release part 146i that extends from its tip in the direction of the rotation axis of the rotating body 144. The fitting release part 146i is passed through the through hole 142i of the tilt measurement part body 142. When the rotation restriction part 146 moves to sandwich the rotating body 144 between the rotation restriction part 146 and the tilt measurement part body 142, the tip side of the fitting release part 146i protrudes outside the case 40 from the second case hole 42 of the case 40.

When the rotation restricting portion 146 moves toward the tilt measuring portion main body 142, the fitting portion 146f of the rotation restricting portion 146 fits into the fitting portion 142f of the tilt measuring portion main body 142, the rotation restricting portion 146 is fixed to the tilt measuring portion main body 142, and the rotating body 144 is sandwiched between the recessed portion 142e of the tilt measuring portion main body 142 and the protruding portion 146e of the rotation restricting portion 146 and fixed in position. At least one of the head portion 146h of the rotation restricting portion 146 and the narrow portion 142h of the tilt measuring portion main body 142 is formed of a material that is relatively easily elastically deformed, such as synthetic resin, so that the head portion 146h can be attached and detached to the fitting hole 142g. As a result, when the rotation restricting portion 146 moves toward the tilt measurement unit main body 142 in the direction of the rotation axis of the rotating body 144, at least one of the head 146h of the rotation restricting portion 146 and the narrow portion 142h of the tilt measurement unit main body 142 is deformed, and the head 146h of the rotation restricting portion 146 is inserted into the fitting hole 142g of the tilt measurement unit main body 142, and the rotation restricting portion 146 is fixed to the tilt measurement unit main body 142. The head 146h of the rotation restricting portion 146 inserted into the fitting hole 142g of the tilt measurement unit main body 142 is less likely to come out of the fitting hole 142g because its bottom surface is larger than the cross section of the opening of the fitting hole 142g. Therefore, even if an external force such as an impact acts on the core sampling device main body 1, the fixation between the tilt measurement unit main body 142 and the rotation restricting portion 146 and the fixation of the rotating body 144 by them are less likely to be released. When the rotation restriction part 146 is fixed to the inclination measurement part main body 142, if the tip of the fitting release part 146i protruding from the second case hole 42 to the outside of the case 40 is pushed toward the case 40, at least one of the head part 146h of the rotation restriction part 146 and the narrow part 142h of the inclination measurement part main body 142 is deformed, and the head part 146h of the rotation restriction part 146 comes out of the fitting hole 142g of the inclination measurement part main body 142, and the fixation between the rotation restriction part 146 and the inclination measurement part main body 142 is released.

The pressed surface 146c of the rotation regulating portion 146 of each inclination measurement portion is the portion that is pressed by the push-out portion 80 of the push-out unit 70 or the support body 71 described below, and is a square surface parallel to the opposing surface 146b. To make it easier to see the rotor 144 and scale 142j from outside the inclination measurement portion, the base 146a of the rotation regulating portion 146 is made of a transparent material such as a transparent synthetic resin.

The tilt measurement unit main body 142 and the rotation restriction unit 146 are provided with a plurality of guide parts 150 to connect the two so that the rotation restriction unit 146 can move toward the tilt measurement unit main body 142 in the direction of the rotation axis of the rotating body 144, and to restrict the range of movement to prevent the rotating body 144 from falling off from the recess 142e. The guide part 150 of the tilt measurement unit main body 142 has a guide hole 152 and a narrow part 154. The guide hole 152 is provided on the fixed surface 142c side from the opposing surface 142b of the base part 142a of the tilt measurement unit main body 142 in a direction parallel to the rotation axis of the rotating body 144. The narrow part 154 protrudes concentrically from the peripheral wall of the guide hole 152 toward the center at the opening of the guide hole 152, narrowing the cross section (width) of the opening of the guide hole 152. The guide section 150 of the rotation restricting section 146 includes a guide section main body 156 and a head section 158. The guide section main body 156 is rod-shaped extending from the opposing surface 146b of the base section 146a of the rotation restricting section 146 in a direction parallel to the rotation axis of the rotating body 144, and its tip side is inserted into the guide hole 152. The head section 158 is cylindrical. The bottom surface of the head section 158 is coaxially connected to the tip of the guide section main body 156 in the guide hole 152. The cross section of the guide section main body 156 is smaller than the cross section of the opening of the guide hole 152 of the tilt measuring section main body 142. The diameter of the head section 158 is larger than the cross section of the opening of the guide hole 152 and smaller than the cross section of the guide hole 152 located inside the opening.

The rotation restricting unit 146 moves within a range where the rotating body 144 does not fall out from between the tilt measuring unit main body 142 and the rotation restricting unit 146 and the rotating body 144 can be fixed between the tilt measuring unit main body 142 and the rotation restricting unit 146 by the guide unit 150. More specifically, in the initial state, the rotation restricting unit 146 is at a position farthest from the tilt measuring unit main body 142, and the distance between the tip of the convex portion 146e of the rotation restricting unit 146 and the opposing surface 142b of the tilt measuring unit main body 142 is smaller than the diameter of the rotating body 144. In a fixed state where the rotation restricting unit 146 is fixed to the tilt measuring unit main body 142, the distance between the tip of the convex portion 146e of the rotation restricting unit 146 and the bottom surface of the concave portion 142e of the tilt measuring unit main body 142 is approximately the same as the diameter of the rotating body 144. The depth of the guide unit body 156 of the inclination measurement unit body 142 and the guide hole 152 of the rotation restriction unit 146 are set so that the rotation restriction unit 146 moves within this range.

The moving part 60 shown in Figs. 1 to 4 is movable in the vertical direction within the core sampling device main body 1. In this embodiment, the moving part 60 is cylindrical. The moving part 60 is passed through the through-hole 36, the inner ring 56 of the case bearing 50, and the second case hole 42. The moving part 60 is supported by the core contact part 34 so as to be movable in the vertical direction by being pressed against the water-stopping part at the through-hole 36. In the initial state, the lower end of the moving part 60 protrudes downward from the core contact part 34 and the core sampling device main body 1, and the upper end is located within the case 40. The moving part 60 is provided with a moving part hole 62, which is a hole into which the support body 71 described later is inserted so as to be movable in the vertical direction. The moving part hole 62 is one aspect of the moving part space. The moving part hole 62 extends downward from the upper end of the moving part 60, and its cross section is circular. The bottom of the moving part hole 62 becomes the second pushing part 66. The moving part 60 has a first pushing part 64 at its upper end that protrudes radially (annularly) outward in the horizontal direction. The first pushing part 64 is located at the bottom of the moving part hole 62, i.e., above the second pushing part 66.

Instead of the moving part hole 62, the moving part 60 may have a hole that penetrates the moving part 60 in the upper right and lower direction, i.e., may be cylindrical. In this case, the second pushing part 66 may shield the inside of the moving part 60 or may protrude into the moving part 60.

1, 2 and 4, the pushing unit 70 includes a support 71, a pushing section 80 and an elastic body 90. The support 71 is cylindrical, and the lower end side is inserted into the moving section hole 62 of the moving section 60 with the axis parallel to the vertical direction. The axes of the support 71 and the moving section 60 overlap with the axis of the case 40. The support 71 is located below the third tilt measurement section 130. The support 71 includes a first mounting section 72, a second mounting section 73 and a movement restriction section 76. The first mounting section 72 and the second mounting section 73 are the same, are disk-shaped, and have holes penetrating the plate surface, through which the support 71 passes. The first mounting section 72 is supported by the first pushing section 64 of the moving section 60. The second mounting section 73 is located above the first mounting section 72. The first mounting portion 72 and the second mounting portion 73 are movable in the vertical direction along the support 71, and are also rotatable around the support 71 in the vertical direction. When the first mounting portion 72 is supported by the first pushing portion 64 of the moving portion 60, the lower end of the support 71 is located above the second pushing portion 66 (the bottom of the moving hole). In other words, there is a gap between the support 71 and the second pushing portion 66 (the bottom of the moving hole). A pair of mounting bases 74 is provided on the upper surface of the first mounting portion 72 and the bottom surface of the second mounting portion 73 to connect the pushing portion 80. The pair of mounting bases 74 have a gap in the horizontal direction. In addition, each mounting base 74 has a hole that penetrates parallel to the direction in which the gap is opened. A plurality of pairs of mounting bases 74 are provided around the axis of each of the first mounting portion 72 and the second mounting portion 73 according to the number of the pushing portions 80. The movement restriction portion 76 is intended to restrict the movement of the second mounting portion 73 upward from a predetermined position. Here, the movement restriction portion 76 is a disk-shaped member whose diameter is larger than the diameter of the hole in the second mounting portion 73, and is coaxially connected to the upper end of the support 71.

The pushing portion 80 is for pushing out the inclination measurement portion. In this embodiment, the pushing portion 80 is for pushing out the first inclination measurement portion 110 and the second inclination measurement portion 120. The pushing portion 80 is composed of a pair of pushing members 82, 82. Each pushing member 82 is composed of a member extending linearly. One end of each of the pair of pushing members 82, 82 is rotatably connected to the shaft portion 84 with the horizontal direction as an axis. The other end of each pushing member 82 is rotatably connected to the mounting base portion 74 of the first mounting portion 72 and the second mounting portion 73 with the shaft portion 84 with the horizontal direction as an axis. As shown in FIG. 4, a plurality of pushing portions 80 are provided at equal pitches around the side peripheral surface (around the vertical direction) of the support 71. Note that, for convenience, in FIG. 1, FIG. 2, and FIG. 11, only the pushing portions 80 at the front and rear of the support 71 are shown, and the other pushing portions 80 are omitted. In the initial state, the longitudinal direction of each extrusion member 82 is parallel to the vertical direction. At least one of the multiple extrusion parts 80 is located approximately in the front-rear direction of the first tilt measurement part 110. At least one of the multiple extrusion parts 80 is located approximately in the left-right direction of the second tilt measurement part 120.

The elastic body 90 prevents the push-out portion 80 from bending or curving in the initial state. In this embodiment, the elastic body 90 is a coil spring, and the support body 71 passes through it between the first mounting portion 72 and the second mounting portion 73. In the initial state, the restoring force of the elastic body 90 keeps the push-out portion 80 from bending, in other words, keeps the longitudinal direction of the push-out member 82 parallel to the vertical direction.

The extrusion unit 70 may have a curved extrusion section 80. Also, instead of the elastic body 90, the extrusion unit 70 may have an elastic body 90 in which the extrusion section 80 itself is bendable or curveable and has a restoring force acting to prevent the extrusion section 80 from bending or curving.

The operation of the moving part 60, the inclination measurement part, and the extrusion unit 70 will be described. The inclination measurement part rotates (moves) in accordance with the inclination of the core sampling device main body 1 so that the rotating body 144 is located on the lower side in the direction of gravity in the recess 142e. As shown in FIG. 11, when the moving part 60 is pushed by the core C and rises, the first mounting part 72 is pushed by the first pushing part 64 and rises, and the rise of the second mounting part 73 is restricted by the movement restriction part 76, so that the rotatably connected part of the pair of pushing members 82, 82 of the extrusion part 80 is bent toward the outside in the horizontal direction. When the extrusion part 80 is bent, the pressed surface 146c of the rotation restriction part 146 of the first inclination measurement part 110 and the second inclination measurement part 120 is pressed by each extrusion part 80, and each rotation restriction part 146 moves toward the inclination measurement part main body 142 side. The rotating body 144 is then sandwiched between the recessed portion 142e of the inclination measurement unit main body 142 and the protruding portion 146e of the rotation restriction portion 146 to fix its position, and the fitting portion 146f of the rotation restriction portion 146 is fitted into the fitting portion 142f of the inclination measurement unit main body 142 to fix the inclination measurement unit main body 142 and the rotation restriction portion 146.

Because the first pushing portion 64 is located above the second pushing portion 66 and there is a gap between the second pushing portion 66 and the support 71, when the moving portion 60 rises further after the pushing portion 80 pushes out the rotation regulating portion 146 of the first tilt measurement portion 110 and the second tilt measurement portion 120, the second pushing portion 66 comes into contact with the support 71, and the support 71 is pushed by the moving portion 60 and rises. When the support 71 rises, the pressed surface 146c of the rotation regulating portion 146 of the third tilt measurement portion 130 is pushed by the support 71, and the rotation regulating portion 146 moves toward the tilt measurement portion main body 142. The rotating body 144 is then sandwiched between the recessed portion 142e of the inclination measurement unit main body 142 and the protruding portion 146e of the rotation restriction portion 146 to fix its position, and the fitting portion 146f of the rotation restriction portion 146 is fitted into the fitting portion 142f of the inclination measurement unit main body 142 to fix the inclination measurement unit main body 142 and the rotation restriction portion 146.

As described above, because the case 40 can rotate in the vertical direction relative to the core contact portion 34 and the case 40 is provided with the weight portion 48, when the vertical direction of the core sampling device main body 1 is tilted relative to the direction of gravity, the case 40 rotates so that the weight portion 48 is always located on the lower side of the direction of gravity, so that the posture of the case 40 is always kept constant. Therefore, the rotation axis of the rotating body 144 of the first inclination measurement unit 110 is always parallel to the front-to-back direction, and the rotation axis of the rotating body 144 of the second inclination measurement unit 120 is always parallel to the left-to-right direction. As a result, the first inclination measurement unit 110 can measure the inclination of the core sampling device main body 1 relative to the front-to-back direction, and the second inclination measurement unit 120 can measure the inclination of the core sampling device main body 1 relative to the left-to-right direction. And since the core C collected by the core collecting device main body 1 is coaxial with the core collecting device, the inclination of the core collecting device main body 1 measured by the first inclination measuring unit 110 and the second inclination measuring unit 120 can be regarded as the inclination of the core C (the inclination of the core C in the longitudinal direction).

In addition, the third inclination measurement unit 130 can confirm whether the weight portion 48 of the case 40 was located on the lower side in the direction of gravity. The third inclination measurement unit 130 always keeps the posture of the case 40 constant, so that the line of the reference scale 142k indicating the front-rear direction among the scales 142j coincides with the direction from the rotation axis of the case 40 to the weight portion 48 (center of gravity). Therefore, if the rotating body 144 of the third inclination measurement unit 130 is on the rear (weight portion 48 side) scale of the reference scale 142k indicating the front-rear direction, the weight portion 48 of the case 40 is located on the lower side in the direction of gravity, and the rotation axes of the first inclination measurement unit 110 and the second inclination measurement unit 120 are kept in the front-rear and left-right directions, and the inclination of the core C measured by the first inclination measurement unit 110 and the second inclination measurement unit 120 can be determined to be reliable. Conversely, if the rotating body 144 of the third inclination measurement unit 130 is not on the rear (weight portion 48 side) of the reference scale 142k indicating the front-rear direction, then some factor such as the rotation of the core C or the like has caused the case 40 to rotate about an axis in the vertical direction, the weight portion 48 of the case 40 is not positioned on the lower side in the direction of gravity, and the rotation axes of the first inclination measurement unit 110 and the second inclination measurement unit 120 are not parallel to the front-rear direction and the left-right direction, so the inclination of the core C measured by the first inclination measurement unit 110 and the second inclination measurement unit 120 can be determined to be unreliable.

As shown in FIG. 12, the boring device 170 includes a boring device main body 172, a rod 176, the core sampling device, and a liquid supply unit 180. The boring device main body 172 includes a drive unit 174 that rotates the rod 176 around its axis and translates (advances and retreats) in its axial direction. The rod 176 is tubular and is supported by the boring device main body 172 so as to be rotatable and translatable. The core sampling device is attached to the lower end of the rod 176 via the outer tube head 14. The liquid supply unit 180 includes a liquid storage unit 182, a liquid supply path 184, and a liquid transport unit 186. The liquid storage unit 182 stores liquid. The liquid supply path 184 is hose-shaped, with one end disposed in the liquid storage unit 182 and the other end connected to the upper end of the rod 176, connecting the inside of the liquid storage unit 182 and the inside of the rod 176. The liquid transport unit 186 is provided in the liquid supply unit 180 and transports the liquid stored in the liquid storage unit 182 to the rod 176. A pump is used as the liquid transport unit 186. The liquid supply unit 180 supplies the liquid from the liquid storage unit 182 through the rod 176 to the core sampling device main body 1 and releases it from its opening.

Next, a method for extracting cores using the boring machine 170 equipped with the above-mentioned core extracting device will be described.
First, before sampling the core C, each component of the core sampling device is set to an initial state, and then the core C is sampled. To sample the core C, as shown in Fig. 11 and Fig. 12, the rod 176 of the boring device 170 is rotated and translated to rotate the outer tube 10 and the bit 16 while translating the core sampling device main body 1 into the ground, and the core C is excavated while the ground is excavated, and the core C is sampled in the core sampling device main body 1. At this time, if necessary, liquid is discharged from the opening of the core sampling device main body 1 to cool the bit 16 while the ground is excavated and the core C is sampled.

When drilling the ground and extracting the core C, when the rod 176 is translated toward the back of the ground, the moving part 60 protruding downward from the penetration part 36 of the core contact part 34 first contacts the ground before the bit 16 contacts the ground. When the moving unit 60 is pushed by the ground and rises, the first mounting unit 72 is pushed by the first pushing unit 64 and rises, bending the pushing unit 80, the rotation regulating unit 146 of the first inclination measurement unit 110 and the second inclination measurement unit 120 is pushed by the pushing unit 80, the rotation regulating unit 146 of the third inclination measurement unit 130 is pushed by the support 71 and moves toward the inclination measurement unit main body 142, the rotating body 144 is sandwiched between the recess 142e of the inclination measurement unit main body 142 and the protrusion 146e of the rotation regulating unit 146 and its position is fixed, and the fitting portion 146f of the rotation regulating unit 146 is fitted into the fitting portion 142f of the inclination measurement unit main body 142, and the rotation regulating unit 146 is fixed to the inclination measurement unit main body 142.

When the bit 16 comes into contact with the ground and begins to excavate the ground, the core C that has been excavated from the ground by the bit 16 is taken into the inner tube 20 through the opening of the core sampling device main body 1. Then, as shown in FIG. 11, the core C taken into the inner tube 20 of the core sampling device main body 1 pushes up the support part 30, which includes the case 40, the moving part 60 and the pushing unit 70, and rises inside the inner tube 20.

Then, when the core C in a predetermined section of the ground is collected in the core collecting device main body 1 (inner pipe 20), the rod 176 is translated to pull the core collecting device out of the borehole, and the support unit 30 having the case 40 inside is removed from the core collecting device. Next, the support unit main body 32 is removed from the removed support unit 30, and the rotation angles of the rotors 144 of the first inclination measurement unit 110, the second inclination measurement unit 120, and the third inclination measurement unit 130 are read through the case 40. In addition, if the angle measured by the third inclination measurement unit 130 is reliable as described above, the rotation angles of the rotors 144 measured by the first inclination measurement unit 110 and the second inclination measurement unit 120 can be regarded as the inclination of the core C with the front-rear and left-right directions of the collected core C as axes. In addition, the length of the excavation of the ground can be specified by the translation length of the rod 176 in that section. The translational length of the rod 176 can be measured, for example, by a displacement meter that measures the displacement of the rod 176 provided in the boring device 170.

As described above, the core sampling device is set to the initial state, cores C are sampled in a predetermined section using the boring device 170, and the inclination of the cores C is read. This series of operations is repeated until all cores C are sampled in the core C sampling range of the ground. When returning each component of the core sampling device to its initial state, the fitting release portion 146i of each inclination measurement portion protruding outside the case 40 is pressed to set each rotation restriction portion 146 to its initial state. In addition, the moving portion 60 is set to its initial state by inserting a puller such as tweezers and pulling it downward. In addition, the support portion main body 32 is attached to the core contact portion 34. Then, the support portion 30 including the case 40, moving portion 60, and extrusion unit 70 is inserted into the inner tube 20 of the core sampling device main body 1, and the core contact portion 34 is clamped by the core lifter 26.

The core sampling device of the present invention is equipped with a push-out unit 70 having a push-out section 80, which reliably pushes either the inclination measurement section main body 142 or the rotation restriction section 146, so that the longitudinal inclination of the core C being sampled can be reliably measured.

The core sampling device of the present invention includes, as inclination measurement sections, a section whose rotation axis is parallel to the horizontal direction and a section whose rotation axis is parallel to the vertical direction, provided within a case 40. The push-out unit 70 is disposed within the case 40 and includes a support 71 that supports a push-out section 80. The moving section 60 is passed through the case 40 and includes a moving section space into which the support 71 is inserted from above so as to be relatively movable in the vertical direction, a first pushing section 64 that supports the push-out section 80 and pushes the push-out section 80 as the moving section 60 moves upward, and a second pushing section 66 that pushes the support 71 as the moving section 60 moves upward. The first pushing section 64 is a space into which the support 71 is inserted from above so as to be relatively movable in the vertical direction. The portion 64 is positioned above the second pushing portion 66, the pushing portion 80 is pushed by the first pushing portion 64 and bent or curved in an approximately horizontal direction, the inclination measurement portion whose rotation axis is parallel to the horizontal direction is positioned horizontally outward from the pushing portion 80, and as the moving portion 60 moves upward, one of the inclination measurement portion main body 142 and the rotation regulating portion 146 is pushed by the pushing portion 80, and the inclination measurement portion whose rotation axis is parallel to the up-down direction is positioned above the support body 71, and as the moving portion 60 moves upward, one of the inclination measurement portion main body 142 and the rotation regulating portion 146 is pushed by the support body 71.
According to this embodiment, when the moving part 60 rises during core collection, first the push-out part 80 presses one of the inclination measurement part main body 142 and the rotation regulating part 146 of the inclination measurement part whose rotation axis is parallel to the horizontal direction, and then the support body 71 presses one of the inclination measurement part main body 142 and the rotation regulating part 146 of the inclination measurement part whose rotation axis is parallel to the vertical direction, so that the inclination of the core C can be measured more reliably.

The core sampling device of the present invention has an extrusion unit 70 that includes multiple extrusion parts 80 around the support 71. Even if the moving part 60 rotates around its axis and the support 71 rotates accordingly, one of the extrusion parts 80 can press either the inclination measuring part main body 142 or the rotation regulating part 146 of the inclination measuring part whose rotation axis is parallel to the horizontal direction, so that the inclination of the core C relative to the horizontal direction can be measured more reliably.

In the core sampling device of the present invention, the push-out section 80 is an elastic body 90 that exerts a restoring force so as not to bend or curve the push-out section 80, or the push-out unit 70 is provided with an elastic body 90 that exerts a restoring force so as not to bend or curve the push-out section 80. In the case where the moving section 60 rises due to a factor other than the moving section 60 being pushed by the core C, such as when the moving section 60 rises due to an impact, the push-out section 80 is not bent or curved, and the inclination measuring section can be prevented from measuring the inclination of the core C before the moving section 60 is pushed by the core C.

In the core sampling device of the present invention, the case 40 is connected to the core contact part 34 so that it cannot rotate together with the moving part 60. Therefore, even if the core contact part 34 or the moving part 60 rotates in the vertical direction during core sampling, the case 40 does not rotate, so the direction of the rotation axis of the inclination measurement part, whose rotation axis is parallel to the horizontal direction, can be maintained in a specified direction.

The present invention is not limited to the above embodiment, and can be modified as appropriate within the scope of the present invention.

LIST OF SYMBOLS 1 Core sampling device body 10 Outer tube 12 Outer tube body 14 Outer tube head 14a Detachable portion 15 Flow path 16 Bit 18 Connecting rod 20 Inner tube 22 Inner tube body 24 Inner tube head 26 Core lifter 28 Bearing 30 Support portion 32 Support portion body 34 Core contact portion 36 Penetration portion 40 Case 41 First case hole 42 Second case hole 48 Weight portion 50 Case bearing 52 Outer ring 54 Middle ring 56 Inner ring 58 Ball 60 Moving portion 62 Moving portion hole (moving portion space)
64 First pushing portion 66 Second pushing portion 70 Push-out unit 71 Support 72 First mounting portion 73 Second mounting portion 74 Mounting base portion 76 Movement restricting portion 80 Push-out portion 82 Push-out member 84 Shaft portion 90 Elastic body 110 First tilt measuring portion (tilt measuring portion)
120 Second tilt measurement unit (tilt measurement unit)
130 Third tilt measurement unit (tilt measurement unit)
142 inclination measurement unit main body 142a base 142b opposing surface 142c fixed surface 142d side peripheral surface 142e recess 142f fitting portion 142g fitting hole 142h narrow portion 142i through hole 142j scale 142k reference scale 144 rotating body 146 rotation regulating portion 146a base 146b opposing surface 146c pressed surface 146d side peripheral surface 146e protrusion 146f fitting portion 146g fitting unit main body 146h head 146i fitting release portion 150 guide portion 152 guide hole 154 narrow portion 156 guide unit main body 158 head 170 boring device 172 Boring device body 174 Driving device 176 Rod 180 Liquid supply section 182 Liquid storage section 184 Liquid supply passage 186 Liquid transport section C Core

Claims (5)

a core sampling device body that is attached to a rod of the boring device and excavates the ground while sampling a core therein;
A detachable case within the core sampling device body;
A moving unit that is movable in a vertical direction within the core sampling device body;
At least one inclination measuring unit provided in the case and configured to measure an inclination of the core sampling device body;
a push-out unit provided in the core collecting device body and having a push-out part;
Equipped with
The tilt measurement unit includes a tilt measurement unit main body, a rotating body, and a rotation regulating unit,
the rotating body is provided on the tilt measurement unit main body or the rotation regulating unit so as to be rotatable around a rotation axis,
the tilt measurement unit body and the rotation regulating unit face each other in a direction parallel to a rotation axis of the rotating body, and the tilt measurement unit body or the rotation regulating unit is movable in a direction parallel to the rotation axis of the rotating body,
As the moving part moves upward, the pushing-out part is pushed out towards the inclination measurement part, and one of the inclination measurement part main body and the rotation regulating part is pushed by the pushing-out part and moves to the other side, the rotating body is sandwiched between the inclination measurement part main body and the rotation regulating part, and the rotation of the rotating body is regulated ,
The push-out portion is bendable or curved, and bends or curves toward the inclination measurement portion as the moving portion moves upward, thereby pushing one of the inclination measurement portion main body and the rotation regulating portion.This is a core sampling device. The tilt measurement unit includes a rotor whose rotation axis is parallel to a horizontal direction and a rotor whose rotation axis is parallel to a vertical direction, the tilt measurement unit being provided in the case;
the push-out unit is disposed in a case above the moving part and includes a support body that supports the push-out part;
the moving part is inserted into the case, and includes a moving part space into which the support is inserted from above in the vertical direction, a first pushing part which pushes the pushing-out part as the moving part moves upward, and a second pushing part which pushes the support as the moving part moves upward,
The first pushing portion is located above the second pushing portion,
The push-out portion is pushed by the first push portion and bent or curved in a substantially horizontal direction,
the tilt measurement unit, the rotation axis of the rotor being parallel to the horizontal direction, is positioned horizontally outward of the push-out unit, and one of the tilt measurement unit body and the rotation regulating unit is pushed by the push-out unit as the moving unit moves upward;
The core sampling device of claim 1, wherein the inclination measurement unit, whose rotation axis is parallel to the vertical direction, is positioned above the support body, and as the moving unit moves upward, one of the inclination measurement unit main body and the rotation regulating unit is pressed against the support body. The core sampling device according to claim 2 , wherein the push-out unit includes a plurality of push-out portions arranged around the support in the vertical direction. A core sampling device described in any one of claims 1 to 3, wherein the extrusion portion is an elastic body that exerts a restoring force to prevent the extrusion portion from bending or curving, or the extrusion unit is provided with an elastic body that exerts a restoring force to prevent the extrusion portion from bending or curving. A boring machine comprising the core sampling device according to any one of claims 1 to 4 .