JP2013224516A - Subsoil exploration apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a subsoil exploration apparatus having a simple configuration and enabling both subsoil boring for sampling of the subsoil and standard penetration test for measurement of an N value to be performed by one subsoil exploration apparatus in a short time.SOLUTION: A leader 13 is rotated at a standard penetration test position B, and a boring rod 33 is gently lowered to the perforated bottom of a hole drilled by a boring rod 26. The axial center of the drilled hole (axial center of the boring rod 26) and the axial center of the boring rod 33 at the standard penetration test position are located in a substantially concentric manner. Therefore, the upper end of the boring rod 33 can be struck and an N value can be measured after drilling a subsoil by the boring rod 26 without moving the position of a subsoil exploration apparatus 1, so that the work time can be shortened.

Description

  The present invention relates to a ground surveying apparatus that samples a soil by drilling the ground to survey the ground. More specifically, it is possible to perform both the drilling of the ground sampling the soil to determine liquefaction of residential land and the standard penetration test for measuring the N value in a short time with a single ground survey device. It relates to the ground survey device.

  The ground surveying device is used for surveying the condition of the strata and the like by sampling the soil by drilling the ground with a boring rod. In addition, the ground survey device increases the excavation efficiency by applying rotational motion and axial reciprocating vibration to the boring rod, and installing the boring rod on a self-propelled crawler to remove soil at multiple survey points. Sampling work is performed in a short time. This ground survey device is used to determine liquefaction of residential land (for example, residential land of a detached house), investigation of contamination status, drilling of grout holes, drilling of anchor holes, drilling of chemical injection holes, drilling of blast holes, draining water It may be used for the purpose of drilling holes.

  The conventional standard penetration test first drills with a bit at the bottom of the boring rod of the boring machine to the depth to be investigated. Next, pull up the boring rod, attach a standard penetration test sampler to the lower end of the boring rod and lower it to the bottom of the hole, attach a knocking block and guide boring rod to the upper end of the boring rod, and hit the knocking block with a drive hammer. The standard penetration test was performed and the N value was measured.

  However, in the conventional standard penetration test apparatus, in addition to the original penetration test, extremely large preparations such as assembling of the kite, dismantling of the kite and loading and unloading of the boring machine, and cleaning work are required. Therefore, in order to perform both the liquefaction determination of the ground by the above ground survey device, the investigation of the contamination status and the N value measurement by the standard penetration test device at a plurality of survey points on the same site, Since it is necessary to move and assemble standard penetration testing devices such as moving, dredge, boring machine, and drive hammer as many times as the number of survey points, there is a problem that the working time becomes long.

  In Patent Document 1, a head is installed on a leader standing on a self-propelled pile driving machine so that the leader can move up and down separately from the sand compaction pile construction device. This head is provided with a revolver that rotates 180 degrees in a planar position, and a boring rod with a bit at the lower end is freely constrained to the revolver, and a sampling rod with a standard penetration test sampler at the lower end is moved up and down on the revolver. Restrained to move in the direction. With this configuration, the revolver is rotated 180 degrees to switch the ground excavation position by the boring rod and the striking force application position to the sampling rod. Since Patent Document 1 can complete both the construction of the sand compaction pile and the standard penetration test with only a pile driving machine, it is not necessary to assemble the kite or carry in / out the boring machine. Since a pile driving mechanism, a boring rod rotating mechanism, a sampling rod striking mechanism, a revolver rotating mechanism, and the like are required, there is a problem that the structure is complicated.

  Patent Document 2 includes a columnar frame (leader) erected on a self-propelled pile driving machine, and an elevating unit that is provided so as to be movable up and down along the columnar frame and has a motor that rotates and embeds a support pile. Yes. A weight dropping device for striking the knocking block is supported on a drive shaft of the motor via a support, and an excavation head for excavating an excavation hole can be connected to the support. With this configuration, the weight drop device and excavation head are exchanged and attached to the motor drive shaft of the lifting unit of the pile driving machine via the support, and the ground excavation by the excavation head and the impact force by the weight drop device Is granted. Since Patent Document 2 can complete both the support pile burying and the standard penetration test with only a pile driver, it is not necessary to assemble the cage or carry in / out the boring machine, so the work time can be shortened. Since a support pile rotating mechanism, excavation head, weight drop device, support body for exchanging the weight drop device and excavation head, and the like are necessary, there is a problem that the structure becomes complicated.

JP 2000-170163 A JP 2004-1000039 A

  The object of the present invention is that the structure is simple and both the drilling of the ground for sampling the soil for liquefaction judgment and the standard penetration test for measuring the N value can be performed in a short time with a single ground survey device. An object of the present invention is to provide a ground investigation device that can be performed.

The said subject is solved by the following means.
That is, the ground investigation device of the present invention 1
A fuselage, a leader standing on the fuselage, a shaft support for pivotally supporting the leader with respect to the fuselage in a horizontal plane between a drilling position and a standard penetration test position, and along the leader A feed table that is movably provided, a feed device that drives the feed table along the leader, and is rotatably supported by the feed table to pierce the ground at the piercing position of the leader. A first boring rod provided with a bit for drilling, a rotary drive device that applies a rotational force to the first boring rod, and a rope that supports and suspends a drive hammer at a standard penetration test position of the leader For this purpose, it is inserted into the excavation hole excavated by the pulley provided at the upper end of the leader and the first boring rod, and at the lower end. A second boring rod sampler quasi penetrometer is provided, and characterized in that with a knock blocks striking by said drive hammer provided near the upper end of the second boring rod.

The ground investigation device of the present invention 2 is the present invention 1,
A turning drive device for turning the leader in the horizontal plane, the shaft center of the first boring rod and the shaft center of the second boring rod at the standard penetration test position of the leader; Is a concentric position.

The ground survey device of the present invention 3 is the present invention 2,
First boring rod movement measuring means for measuring the amount of movement excavated by the first boring rod, and second boring rod movement measuring means for measuring the amount of movement of the second boring rod due to the impact. It is characterized by.

The ground investigation device of the present invention 4 is the present invention 3,
In the first boring rod movement measuring means, a tip of a wire fed out from a linear encoder main body arranged at an upper end of the leader is locked to the feed table, and the excavation depth of the first boring rod is determined by the feed amount of the wire. The second boring rod movement measuring means measures the amount of movement of the wire connected to the second boring rod, and the amount of penetration of the boring rod per stroke. It is characterized by comprising a measuring instrument main body for measuring the total penetration amount.

The ground investigation device of the present invention 5 is the present invention 4,
The measuring device main body is provided in a measuring arm that is movable to a measuring position of an axis of the second boring rod and is movable to a retracted position away from the axis of the second boring rod at a drilling position of the leader. It is characterized by that.

The ground investigation device of the present invention 6 is the present invention 3 to 5,
The second boring rod is provided with a hit detecting means for detecting that the drive hammer hits the knocking block, and the measurement data of the second boring rod movement measuring means and the hit detecting means are used. An automatic recording device for recording the hit detection data is provided.

The ground survey device of the present invention 7 is the present invention 1 to 6,
The drilling of the ground by the first boring rod is for sampling the soil for determining the liquefaction of the ground.

  The ground surveying apparatus of the present invention is provided at the upper end of the leader at the standard penetration test position by turning the leader in a horizontal plane between the drilling position and the standard penetration test position, drilling the ground with a boring rod at the drilling position. A drive hammer is suspended by a pulley, the upper end of a standard penetration test boring rod is hit, the N value is measured, and a standard penetration test is performed. Therefore, the structure is simple, and it is possible to perform both the drilling of the ground sampling the soil for liquefaction judgment and the standard penetration test for measuring the N value in a short time with one ground survey device. It becomes. In particular, it was possible to provide a ground survey device suitable for conducting ground surveys on residential land of detached houses.

  Further, the axial center of the boring rod at the drilling position and the axial center of the boring rod for standard penetration testing at the standard penetration test position are formed in concentric positions. Therefore, after drilling the ground with a boring rod (sampler), the N value can be measured by striking the upper end of the standard penetration test boring rod without moving the position of the ground investigation device. Can be shortened. In addition, the measurement arm with a measuring instrument body that measures the penetration amount and the total penetration amount of the standard penetration test boring rod, the measurement position near the axis of the standard penetration test boring rod, and the retracted position away from this measurement position Can be moved to. Accordingly, when the ground is drilled by the boring rod (sampler), the measurement arm does not interfere with the standard penetration test boring rod, so that the workability when drilling the ground is improved. Furthermore, by providing the first boring rod movement measuring means and the second boring rod movement measuring means, it is possible to accurately measure the drilling depth of the boring rod, the penetration amount of the standard penetration test boring rod, and the cumulative penetration amount. It is possible to conduct ground surveys accurately.

It is a whole perspective view which shows the ground investigation apparatus of embodiment of this invention, turns the leader to a standard penetration test position, and hits the upper end of a sampling rod with a drive hammer and is measuring the N value. It is the front view which looked at the ground investigation apparatus of FIG. 1 from the arrow P direction. FIG. 3 is a plan view of FIG. 2. It is a top view which shows the state which swirled the leader to the drilling position and is drilling the ground with the boring rod. It is an enlarged front view which shows the state which moved the measurement arm of embodiment of this invention to the measurement position of the axial center vicinity of a boring rod. FIG. 6 is an enlarged front view showing a state in which the measurement arm of FIG. 5 is moved to a retracted position away from the center of the boring rod. It is an expansion perspective view which shows a knocking block vicinity. It is the partial arrow line view which looked at the ground investigation apparatus of FIG. 1 from the arrow Q direction. It is an expansion perspective view which shows the knocking block vicinity which shows the attachment mechanism of a wire.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a ground survey apparatus according to an embodiment of the present invention, and is a general perspective view showing a state where an N value is measured by turning a leader to a standard penetration test position and hitting the upper end of a sampling rod with a drive hammer. FIG. FIG. 2 is a front view of the ground surveying apparatus shown in FIG. FIG. 3 is a plan view of FIG. 2, and FIG. 4 is a plan view showing a state where the leader is swung to the drilling position and the ground is drilled by the boring rod. FIG. 5 is an enlarged front view showing a state in which the measurement arm according to the embodiment of the present invention is moved to a measurement position near the axis of the sampling rod. FIG. 6 is an enlarged front view showing a state where the measurement arm of FIG. 5 is moved to a retracted position away from the axis of the boring rod. FIG. 7 is an enlarged perspective view showing the vicinity of the knocking block. FIG. 8 is a partial arrow view of the ground survey device in FIG.

  As shown in FIGS. 1 to 4, the ground investigation device 1 according to the embodiment of the present invention includes a crawler 11 that is a self-propelled moving means, and an upper swivel 12 that is slidably mounted on the crawler 11. And a prism-shaped leader 13 which is erected vertically at the forefront of the upper swivel base 12. The leader 13 is supported at the foremost part (the left side in FIGS. 2 to 4) of the upper swivel 12 so as to be able to swivel in a horizontal plane by a shaft support 14. The turning of the leader 13 includes sampling by a sampler or a drilling position A for drilling (the state shown in FIG. 4), and a standard penetration test position B (index position of the leader when performing a standard penetration test). 3), the vehicle can be turned by the turning angle θ shown in FIGS. The hydraulic cylinder (swing drive device) 15 shown in FIGS. 3 to 4 is operated to apply a turning force to the leader 13.

  The punching device 2 includes a rotation drive device 21 and a vibration generator 22. The punching device 2 is movably mounted on the reader 13 via the feed table 23. That is, the rotation drive device 21 and the vibration generator 22 are fixed to the forefront portion of the feed table 23. The feed table 23 is movable along the leader 13 at the forefront of the leader 13. The feed table 23 is driven by a hydraulic cylinder (not shown) as a feeding device, whereby the entire drilling device 2 moves back and forth in the excavation direction, and the boring rod 26 is fed to and extracted from the ground.

  In the embodiment of the present invention, the leader 13 has a variable excavation angle, and the excavation angle changes as a link (not shown) is rotated by the operation of the hydraulic cylinder 16. The leader 13 does not move during excavation work, but moves in the longitudinal direction of the leader 13 by the operation of the hydraulic cylinder 17 during preparation for excavation, so that the leader 13 can contact and separate from the ground surface. A rotary shaft 24 is disposed in the rotary drive device 21 so as to penetrate the rotary drive device 21. A drive motor (not shown) is fixed to the rotation drive device 21, and the rotation shaft 24 is rotationally driven by the rotation of the drive motor.

  The vibration generator 22 is mounted so as to be displaceable along the feed table 23, that is, in a direction parallel to the axis of the rotary shaft 24. A drive motor 25 is provided in front of the vibration generator 22, and the vibration generator 22 vibrates in the axial direction of the rotary shaft 24 by centrifugal force generated by rotation of an eccentric rotor (not shown) attached to the output shaft. Generate power. The rotating shaft 24 is connected to the vibration generator 22 through a coupling (not shown). The vibration generating force of the vibration generating device 22 is transmitted to the rotating shaft 24 through the coupling. During excavation, a boring rod 26 is sequentially connected to the lower end of the rotary shaft 24.

  As shown in FIG. 4, in a state where the leader 13 is swung to the drilling position A, the boring rod 26 is rotated via the rotating shaft 24 by the operation of the rotation driving device 21, and the boring is performed by the hydraulic cylinder (not shown). The rod 26 is pushed into the ground, and is excavated by the bit at the tip as an initial sampling from the ground surface (GL) to 1 m, in this example, anhydrous. The depth of the excavation hole for this sampling is measured by the following first boring rod movement measuring means 70. As shown in FIG. 8, a linear encoder body 71 is fixed to the top of the reader 13. The linear encoder body 71 is composed of a reel (not shown) for winding the wire 72 and a pulse encoder (not shown) for measuring the feeding length.

  The tip of the wire 72 is connected to the feed table 23 by a connecting portion 73. Therefore, the linear encoder which is the first boring rod movement measuring means 70 can measure the movement of the feed table 23. At the time of excavation by this rotation, the exciting force is transmitted to the boring rod 26 by the vibration generating device 22 via the rotating shaft 24, and the boring rod 26 vibrates in the excavating direction. The vibration of the boring rod 26 causes a fluidization phenomenon in the surrounding soil, and since the soil loosens, the excavation resistance is reduced and the excavation efficiency by the tip bit is increased, so that sampling can be performed accurately. In this embodiment, the vibration generator 22 is mounted. However, the vibration generator 22 is not necessarily mounted depending on the ground.

  When sampling or drilling by the sampler is completed at the boring position A (state shown in FIG. 4), the leader 13 is turned by a hydraulic cylinder (swing drive device) 15 to be described later to perform the standard penetration test. It is indexed to a standard penetration test position B (state shown in FIG. 3) which is a feeding position. Because there is nothing to interfere with the upper part of the drilled hole due to this turning, the standard penetration test used for the standard penetration test (JIS A 1219) is used for the drilled hole drilled (including sampling) by the boring rod 26. Gently lower the boring rod 33 of the device. A standard penetration test sampler 32 is attached to the lower end of the boring rod 33.

  A knocking block 34 and a guide boring rod 35 are attached to the upper portion of the boring rod 33. The guide boring rod 35 is guided by a guide portion 35 a provided on the upper side of the leader 13. On the other hand, a pulley 31 is attached to the upper end of the leader 13. The pulley 31 located at the upper part of the excavation hole can be adjusted in the vertical direction of FIGS. 1 and 2 along the leader 13. The rope 36 is suspended from the pulley 31, and one end (the right end in FIGS. 1 and 2) of the rope 36 is wound around the cone pulley 37. The cone pulley 37 is attached to the rear part of the leader 13.

  3 and 4 show the turning trajectory circle 6 of the axis of the boring rod 26. As shown in the turning locus circle 6, the axis of the drilled boring hole (the axis of the boring rod 26) and the axis of the boring rod 33 (see FIG. 2) at the standard penetration test position B are concentric (the center line is Match) position. Therefore, first, after drilling the ground with the boring rod 26, the standard penetration test is performed by hitting the upper end of the boring rod 33 without moving the working position of the self-propelled ground investigation device 1. Therefore, the working time can be shortened.

  The other end (the left end in FIGS. 1 and 2) of the rope 36 is connected to a catcher 38, and a drive hammer (mass 63.5 kg ± 0.5 kg) 39 is coupled to the catcher 38. The drive hammer 39 is passed through the guide boring rod 35 and gently placed on the knocking block 34 (see FIG. 7). As shown in FIGS. 1, 2, and 7, the knocking block 34 is attached with a limit switch (hitting detection means) 41 for detecting that the ball has been hit. The hit data detected by the limit switch 41 is transmitted to the automatic recording device 80 and counted as the number of hits from the start of the standard penetration test. The number of hits required to allow the standard penetration test sampler 32 at the tip of the boring rod 33 to penetrate 30 cm into the ground is determined as the N value. The limit switch 41 is attached via attachment fittings 42 and 43 fixed to the side surface of the knocking block 34. When the drive hammer 39 strikes the knocking block 34, the lower surface of the drive hammer 39 pushes down the roller 44 of the limit switch 41, and it is detected that the limit switch 41 is activated and struck.

  A columnar locking bracket 45 for locking one end (upper end in FIG. 7) of the wire 51 is attached to the end of the mounting bracket 43 (the right end in FIG. 7). A disk-shaped head 451 is formed on the locking metal fitting 45. The wire 51 whose one end is locked to the head 451 is for measuring the penetration amount and the cumulative penetration amount of the boring rod 33. The other end of the wire 51 (the lower end in FIG. 5) is connected to a linear encoder body 50 that measures the amount of movement of the wire 51. The linear encoder main body (measuring instrument main body) 50 is composed of a reel for winding the wire 51 and a pulse encoder (not shown) for measuring the feeding length. The linear encoder body 50, the wire 51, and the like constitute second boring rod movement measuring means (linear encoder). The second boring rod movement measuring means can measure the penetration amount and the cumulative penetration amount of the boring rod 33 for each hit. The linear encoder body 50 is fixed to the tip of the measurement arm 5. As shown in FIGS. 1, 2, and 5, the measurement arm 5 moves to the standard penetration test position B (state of FIG. 3) of the reader 13 and moves to the measurement position near the axis of the boring rod 33. To use.

  A support plate 52 is erected perpendicularly to the forefront of the upper turntable 12 (the machine base on which the self-propelled carriage turns), and the measurement arm 5 is supported on the front surface of the support plate 52 in a foldable manner. That is, the measurement arm 5 includes a base arm 53, an intermediate arm 54, a tip arm 55, and the like. The base arm 53 is fixed to the front surface (front portion) of the support plate 52, and the right end (on the drawing) of the intermediate arm 54 is pivotally supported on the lower end (on the drawing) of the base arm 53 by the shaft support portion 531. . A shock absorber 58 is disposed between the base arm 53 and the intermediate arm 54 to buffer the turning operation smoothly. Further, the left end (on the drawing) of the intermediate arm 54 is pivotally supported by the hinge 541 on the right end (on the drawing) of the tip arm 55 so as to be bent. These turning and bending operations are performed manually.

  5 shows a state in which the measurement arm 5 is moved to a measurement position that is the axis of the excavation hole (boring hole) from which the sample has been collected by the boring rod 33 (a state in which the measurement arm 5 is extended. 56 is engaged with the engagement pin 532 of the base arm 53, the U-shaped intermediate recess 571 (see FIG. 6) of the lock plate 57 is engaged with the engagement pin 542 of the intermediate arm 54, and the measurement arm 5 is extended. The lock plate 56 is pivotally supported by the intermediate arm 54 by a pivotal support 543. The lock plate 57 is pivotally supported by the tip arm 55 by a pivotal support 551. The lock plate 57 includes an intermediate recess 571 (see FIG. 6) formed at an intermediate position in the longitudinal direction of the lock plate 57 and an end recess 5 formed at an end position in the longitudinal direction of the lock plate 57. 2 (see FIG. 5) are formed.

  The rope 36 (see FIG. 2) is pulled by hand, the drive hammer 39 is lifted by a predetermined distance (76 ± 1 cm), then dropped freely, and the knocking block 34 is hit with the drive hammer 39. At this time, the penetration amount, the cumulative penetration amount, and the number of hits are recorded in the automatic recording device 80 to which the connection cable of the linear encoder and the limit switch 41 is connected. The number of hits required to penetrate the boring rod 33 by 30 cm is measured, and this is taken as the N value at the depth. Data of the automatic recording device 80 can be output to a recording medium such as a compact flash (registered trademark) card or a USB memory. Further, the data of the automatic recording device 80 can be sequentially transmitted to or transmitted to and received from the external control device via a wired or wireless serial communication or the like.

  After measuring the N value, the rope 36 (see FIG. 2) is pulled by hand, the boring rod 33 is pulled out from the excavation hole, and the boring rod 33, the drive hammer 39, and the catcher 38 are removed from the rope 36. One end of the wire 51 is removed from the head 451 of the locking metal fitting 45. The lock plate 56 is removed from the engagement pin 532, the lock plate 57 is removed from the engagement pin 542, and the measurement arm 5 is unlocked. Next, as shown in FIG. 6, the measurement arm 5 is moved to a retracted position away from the axis of the boring rod 26 (a state where the measurement arm 5 is bent and is farthest from the axis of the boring rod 26). That is, the intermediate arm 54 is held by hand, and the intermediate arm 54 is turned clockwise with the shaft support portion 531 as a fulcrum. Further, the distal arm 55 is bent counterclockwise with the hinge 541 as a fulcrum.

  At the retracted position of the measurement arm 5, the lock plate 56 is engaged with the engagement pin 533 at the upper end of the base arm 53, and the tip recess 572 (see FIG. 5) of the lock plate 57 is engaged with the engagement pin 542 of the intermediate arm 54. Then, the measurement arm 5 is locked in a bent state. As shown in FIG. 4, the hydraulic cylinder (swing drive device) 15 is operated to rotate the leader 13 to the drilling position B by the swing angle θ. The crawler 11 is driven, the upper swivel base 12 is swung, the ground surveying apparatus 1 is moved to the next excavation position and positioned, and the next excavation hole is excavated. Accordingly, when the ground is drilled (sampled) by the boring rod 26, the measurement arm 5 does not interfere with the boring rod 26, so that workability when drilling the ground is improved.

  The ground surveying apparatus 1 according to the embodiment of the present invention turns the leader 13 in a horizontal plane between a drilling position A (state shown in FIG. 4) and a standard penetration test position B (state shown in FIG. 3). In the state shown in FIG. 4, the ground is drilled by the boring rod 26. In addition, at the standard penetration test position B (the state shown in FIG. 3), the drive hammer 39 is suspended by a pulley 31 provided at the upper end of the leader 13, and the N value is measured by striking the upper end of the boring rod 33. I do. Therefore, the structure is simple, and very large preparations such as assembling of the kite, dismantling of the kite and loading and unloading of the boring machine, and cleaning work are unnecessary. In addition, it is possible to perform both the drilling of the ground for sampling the soil for liquefaction determination and the standard penetration test for measuring the N value in a short time with the single ground surveying apparatus 1.

[Other embodiments]
Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. Needless to say, changes can be made without departing from the scope and spirit of the present invention. For example, in the above-described embodiment, a crawler and an engine-driven self-propelled carrier upper swivel 12 are equipped with equipment necessary for ground investigation such as the drilling device 2 and the measurement arm 5. . These devices necessary for ground investigation are not the upper swivel 12 of the self-propelled carrier but the airframe (corresponding to the “upper swivel 12” of the above-described embodiment) which is a main body having no self-propelled means. And this machine body may be moved to a desired survey position by a truck-mounted crane. In the above-described embodiment, the measurement arm 5 is manually moved between the measurement position and the retracted position, but may be moved by a driving device such as a hydraulic cylinder. Furthermore, although the turning motion of the leader 13 is performed by the hydraulic cylinder 15, it may be swung by a drive motor.

  FIG. 9 is an enlarged perspective view showing the vicinity of a knocking block showing another attachment mechanism of the wire 51. The wire 51 for measuring the penetration amount shown in FIG. 7 was locked to the cylindrical locking bracket 45. However, with this structure, the wire 51 may be easily detached from the locking bracket 45 due to vibration or the like. A wire 51 shown in FIG. 9 is obtained by welding a mounting plate 431 to a mounting bracket 43 and inserting an annular ring 61 into a through hole opened in the mounting plate 431. Furthermore, a detachable hook 62 is disposed on the annular ring 61. That is, the hook 62 has a known opening / closing mechanism on one side. The hook 63 of the wire 51 is inserted into the annular ring 61 and locked. With these mechanisms, the wire 51 cannot be easily detached due to vibration or the like.

DESCRIPTION OF SYMBOLS 1 ... Ground investigation apparatus 11 ... Crawler 12 ... Upper swivel 13 ... Leader 14 ... Shaft support 15 ... Hydraulic cylinder (swivel drive device)
DESCRIPTION OF SYMBOLS 16 ... Hydraulic cylinder 17 ... Hydraulic cylinder 2 ... Punching device 21 ... Rotary drive device 22 ... Shaking device 23 ... Feed table 24 ... Rotating shaft 25 ... Drive motor 26 ... Boring rod 31 ... Pulley 32 ... Standard penetration test sampler 33 ... Boring rod 34 ... Knocking block 35 ... Guide boring rod 36 ... Rope 37 ... Cone pulley 38 ... Catcher 39 ... Drive hammer 41 ... Limit switch 42 ... Mounting bracket 43 ... Mounting bracket 44 ... Roller 45 ... Locking bracket 451 ... Disc-shaped Head 5 ... Measuring arm 50 ... Linear encoder body 51 ... Wire 52 ... Support plate 53 ... Base arm 531 ... Shaft support 532 ... Engaging pin 533 ... Engaging pin 54 ... Intermediate arm 541 ... Hinge 542 ... Engaging pin 543 ... Shaft support 55 ... Tip arm 551 ... Shaft support 56 ... Lock 57 ... lock plate 571 ... intermediate recess 572 ... the tip recess 6 ... turn trajectory £ 70 ... first boring rod movement measuring means 71 ... linear encoder body 72 ... wire A ... punching position B ... SPT position

Claims (7)

The aircraft,
A leader standing on the aircraft;
A shaft support for pivotally supporting the leader relative to the airframe in a horizontal plane between a drilling position and a standard penetration test position;
A feed table movably provided along the reader;
A feed device for driving the feed table along the reader;
A first boring rod rotatably supported by the feed table and provided with a drilling bit at a lower end in order to drill the ground at the drilling position of the leader;
A rotational drive device for applying a rotational force to the first boring rod;
A pulley provided at the upper end of the leader to wind up the rope that suspends and supports the drive hammer at the standard penetration test position of the leader;
A second boring rod inserted into a drilling hole excavated by the first boring rod and provided with a standard penetration test sampler at the lower end;
A ground surveying device comprising a knocking block provided near the upper end of the second boring rod and hitting with the drive hammer. In the ground investigation device according to claim 1,
A turning drive device for turning the leader in the horizontal plane;
Centering on the shaft support part, the axis of the first boring rod and the axis of the second boring rod at the standard penetration test position of the leader are concentric positions. In the ground investigation device according to claim 2,
First boring rod movement measuring means for measuring the amount of movement excavated by the first boring rod;
A ground surveying apparatus comprising: a second boring rod movement measuring unit that measures a moving amount of the second boring rod moving by the hitting. In the ground investigation device according to claim 3,
The first boring rod movement measuring means includes:
The tip of the wire fed from the linear encoder main body arranged at the upper end of the leader is locked to the feed table, and the excavation depth of the first boring rod is measured by the feed amount of the wire,
The second boring rod movement measuring means includes:
A wire coupled to the second boring rod;
A ground survey device comprising: a measuring instrument body that measures the amount of movement of the wire and measures the amount of penetration of the boring rod and the total amount of penetration for each hit. In the ground investigation device according to claim 4,
The measuring device main body is provided in a measuring arm that is movable to a measuring position of an axis of the second boring rod and is movable to a retracted position away from the axis of the second boring rod at a drilling position of the leader. A ground surveying device characterized by In the ground investigation apparatus of any one of Claim 3 to 5,
The second boring rod is provided with a hit detection means for detecting that the drive hammer hits the knocking block,
An automatic recording device is provided for recording the measurement data of the second boring rod movement measuring means and the hit detection data by the hit detection means. In the ground investigation device according to any one of claims 1 to 6,
The ground drilling apparatus according to claim 1, wherein the drilling of the ground by the first boring rod is for sampling the soil for determining liquefaction of the ground.

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