JP2017122375A - Light-weight ground investigation machine and ground investigation method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-weight ground investigation machine that is light-weighted to weight enabling carriage to a mountain district or the like, and a ground investigation method capable of more accurately determining ground properties by using the machine.SOLUTION: In a penetrometer 10, a pulley 26 to which dead weight of a hammer part 20 is applied is supported by a hanger 70 disposed on the upper side of a support part 24 and the lower parts of legs 64, 66, 68 constituting the support part 24 are supported on a ground 62 to be investigated directly or via a pedestal part 56. When the hammer part 20 is being lifted, the dead weight of the hammer part 20 applied to the pulley 26 acts upon a drive force generation part 22 through a reaction force transmission part 72 constituting the support part 24. Thereby, when the hammer part 20 is being lifted, the reaction force of force lifting the hammer part 20 is cancelled by the dead weight of the hammer part 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lightweight ground survey machine and a ground survey method using the same.

  Conventionally, a standard penetration test is generally used as a method for investigating the properties of the ground for constructing a foundation structure, and this standard penetration test is performed through the following steps. First, the investigation ground is drilled to a depth to be investigated by a boring machine equipped with a rotary excavation mechanism such as a drill and a circulation mechanism such as a pump for circulating excavation water (muddy water). Next, the boring rod is lowered to the bottom of the hole with the standard penetration test sampler attached to the lower end thereof, and the knocking block and the guide boring rod are attached to the upper end of the boring rod. Then, the knocking block is hit with a drive hammer, and the N value of the survey ground is measured.

  This standard penetration test can also be used for ground surveys for constructing foundation structures in mountainous areas, such as ground surveys for constructing power transmission towers on steep slopes of mountains. However, it is necessary to carry boring equipment and materials for work scaffolds to the survey site by some means of transportation. Specifically, materials and equipment used for ground surveys are transported to a position where they can be transported by vehicle, a temporary monorail is laid from this point to the survey point (original position), and these temporary materials are used to investigate these materials and equipment. Work such as transporting to a point is required.

  Here, since the total weight of the above materials and equipment reaches about 1 [t], in the construction of power transmission towers on the slopes of mountainous areas, the conventional ground survey is the installation of very large equipment. It will be forced to carry heavy objects. For this reason, there existed a subject that the work schedule was lengthened, heavy labor, and high cost were caused.

  On the other hand, the following Patent Document 1 discloses an invention related to a ground investigation device. This ground survey device is configured such that a rod or the like used for ground survey is provided in a vehicle and is capable of self-propelling. Moreover, in this ground investigation apparatus, in order to estimate the N value of the investigation ground by continuously measuring the rotational load and the depth of the tip when the rod provided with the excavation blade at the tip is rotationally press-fitted into the ground, the above-mentioned It is possible to obtain the N value of the investigation ground without performing the boring by the mud circulation type boring machine.

JP 2003-74045 A

  However, even with the prior art described in Patent Document 1, it is considered difficult to self-run to a mountainous area. This prior art mainly aims to obtain the N value of the survey ground, and does not sample the survey ground. In addition, since the investigation ground is stirred by the excavation blades at the tip of the rod, it is impossible to sample a sample that does not disturb the investigation ground. On the other hand, the standard penetration test also has a problem that it becomes difficult to accurately determine the property of the survey ground because the survey ground includes drilling water accompanying boring.

  In consideration of the above facts, the present invention provides a lightweight ground surveying machine that has been reduced to a weight that can be easily transported to mountainous areas, and a ground surveying method that can more accurately determine the properties of the ground using the same. The purpose is to provide.

  A lightweight ground investigation machine according to the present invention as set forth in claim 1 includes a boring rod formed in a straight rod shape or a straight cylinder shape, and is attached to the tip of the boring rod so as to penetrate into the investigation ground and the investigation ground. A sampler capable of collecting the sample, a knocking block attached to the head of the boring rod, and a lower end portion connected to the knocking block and extending upward from the knocking block, and formed into a straight rod shape or a straight tube shape A guide rod, a hammer portion that freely falls while being guided by the guide rod and hits the knocking block, and a driving force that is mounted on the investigation ground and that generates a driving force by operating. Part, a pulley part disposed above the upper end of the guide rod, and one side attached to the hammer part. A driving force transmission unit that extends upward of the hammer unit and extends toward the driving force generation unit via the pulley unit, and the driving force generated by the driving force generation unit is transmitted to the other side; Correction means for correcting the influence of friction between the outer peripheral surface of the sampler and the survey ground with respect to the N value obtained by driving the sampler into the survey ground, the pulley unit is supported on the upper side, and the lower side is A support portion configured to include a reaction force transmission portion that is supported on the investigation ground directly or via a member and that causes the self-weight of the hammer portion applied to the pulley portion to act on the driving force generation portion. Yes.

  According to the first aspect of the present invention, a sampler capable of collecting a sample of the investigation ground is attached to the tip of the boring rod formed in a straight rod shape or a straight tube shape, and the head of the boring rod is The part is equipped with a knocking block. In addition, a guide rod formed in a straight rod shape or a straight cylinder shape is disposed above the knocking block, and the guide rod is connected to the knocking block at the lower end thereof, and above the knocking block. Extends to the side. On the other hand, a driving force generator that generates a driving force by operating is placed on the investigation ground, and a pulley is disposed above the upper end of the guide rod. Further, the driving force transmitting portion is attached to the hammer portion on one side and extends to the upper side of the hammer portion, extends toward the driving force generating portion through the pulley portion, and the driving force generating portion on the other side. It arrange | positions so that the generated driving force may be transmitted. In this state, when the driving force generating unit is activated, the driving force generated by the driving force generating unit is transmitted to the hammer unit via the driving force transmitting unit, and the hammer unit is located above the knocking block along the guide rod. Lifted. And the N value of the said investigation ground can be calculated | required because the raised hammer part falls freely, being guided by the guide rod, hitting a knocking block, and a sampler being driven into the investigation ground. At this time, a sample of the survey ground can be taken with the sampler. Moreover, in the present invention, since the drilling by the mud circulation type boring machine is not performed, the sedimentation structure and the geological structure of the sample of the investigation ground are not disturbed by the drilling water of the boring.

  In addition, since it is considered that the N value of the investigation ground obtained as described above is affected by the friction between the outer peripheral surface of the sampler and the investigation ground, in the present invention, the outer periphery of the sampler and the investigation ground The influence of the friction is corrected by the correcting means.

  By the way, in the present invention, as described above, it is possible to obtain the N value of the investigation ground without performing boring with a mud circulation type boring machine, and equipment such as a rotary excavation mechanism such as a drill and a circulation mechanism such as a pump. Is no longer necessary. Further, since it is sufficient that the driving force generation unit can generate a driving force enough to lift the hammer portion, the driving force generation unit can be downsized, and the weight of the driving force generation unit can be reduced. However, if the driving force generation unit is reduced in weight, it is considered that when the hammer unit is lifted by the driving force by the driving force generation unit, the driving force generation unit itself is lifted by the reaction force of the force for lifting the hammer unit. Here, in the present invention, the lift of the driving force generating portion is suppressed by suppressing the reaction force of the force for lifting the hammer portion by utilizing the weight of the hammer portion.

  Specifically, the pulley portion to which the weight of the hammer portion is applied is supported on the upper side of the support portion, and the lower side of the support portion is supported on the investigation ground directly or via a member. And when a hammer part is lifted, the dead weight of the hammer part concerning a pulley part acts on a drive force generation | occurrence | production part via the reaction force transmission part which comprises a support part. For this reason, when a hammer part is lifted, the reaction force of the force which lifts a hammer part will be canceled by the dead weight of the said hammer part.

  A lightweight ground survey machine according to the present invention described in claim 2 is characterized in that, in the invention described in claim 1, the sampler is a standard penetration test sampler capable of performing a standard penetration test, and the correction means is The standard penetration test sampler is replaceable and includes an enlarged cylinder having an outer diameter larger than that of the standard penetration test sampler.

  According to the second aspect of the present invention, the diameter-expanded cylinder is inserted into the investigation ground, and the diameter-expanded cylinder and the standard penetration test sampler are exchanged. Then, a standard penetration test sampler is inserted into the survey ground from the bottom of the hole formed in the survey ground with the diameter expansion cylinder. For this reason, the friction between the outer peripheral surface of the standard penetration test sampler and the investigation ground can be suppressed.

  A lightweight ground survey machine according to a third aspect of the present invention is the lightweight ground survey machine according to the first aspect, wherein the sampler includes a standard shoe that constitutes a standard penetration test sampler capable of performing a standard penetration test. The outer diameter of the barrel constituting the sampler is set smaller than the outer diameter of the standard barrel constituting the standard penetration test sampler and larger than the outer diameter of the boring rod.

  According to the third aspect of the present invention, since the outer diameter of the barrel constituting the sampler is smaller than the outer diameter of the standard barrel constituting the standard penetration test sampler, the surface area of the outer peripheral surface of the barrel is that of the standard barrel. It becomes smaller than the surface area of the outer peripheral surface. When the sampler is inserted into the investigation ground, a barrel having an outer diameter smaller than that of the standard shoe passes through a hole formed by the standard shoe constituting the sampler. For this reason, the friction between the sampler and the investigation ground can be made smaller than the friction between the standard penetration test sampler and the investigation ground.

  According to a fourth aspect of the present invention, there is provided a lightweight ground survey machine according to the first or third aspect of the invention, wherein the correction means is configured such that the known first N value in the predetermined ground and the sampler are the predetermined value. Based on the storage unit storing a previously determined relationship with a known second N value when penetrating into the ground, and the N value obtained by driving the sampler into the survey ground. And a calculation unit capable of calculating the N value of the survey ground.

  According to the fourth aspect of the present invention, there is a predetermined relationship between a known first N value in a predetermined ground and a known second N value when the sampler penetrates into the predetermined ground in the storage unit. It is remembered. Then, the N value of the survey ground is calculated based on the relationship stored in the storage unit and the N value obtained by driving the sampler into the survey ground.

  A lightweight ground survey machine according to a fifth aspect of the present invention is the invention according to any one of the first to fourth aspects, wherein the support portion includes three leg portions and the leg portion. A connecting portion that connects the legs at an upper portion, the pulley portion is attached to the connecting portion, and the reaction force transmitting portion is any of the three legs. A first erection member spanned between the two legs, and a second erection spanned over any two of the three legs in a combination different from the two legs A first transmission member whose upper side is attached to the first erection member and whose lower side is attached to the driving force generator; and an upper side is attached to the second erection member and the lower side is attached to the driving force generator It is comprised including the attached 2nd transmission member.

  According to the present invention described in claim 5, by adjusting the arrangement of the three leg portions of the support portion, the position of the pulley portion and the hammer portion can be easily aligned with respect to the penetration position of the sampler. Can do. In addition, the first erection member spanned on any two of the three leg portions and the first transmission member attached to the first erection member from the two leg portions to the hammer portion. Is transmitted to the driving force generator. Furthermore, by the 2nd transmission member attached to the 2nd installation member and the 2nd installation member spanned over any 2 legs of the combination different from the said 2 legs among the 3 legs The dead weight of the hammer portion is transmitted from the two legs to the driving force generating portion.

  A lightweight ground survey machine according to a sixth aspect of the present invention is the invention according to any one of the first to fourth aspects, in which the pulley portion is attached to an upper side of the reaction force transmission unit. In addition, the lower side is configured to include a straight rod-like or straight cylindrical column attached to the driving force transmitting portion.

  According to the sixth aspect of the present invention, the supporting portion can support the hammer portion and transmit the hammer portion's own weight to the driving force generating portion.

  A lightweight ground survey machine according to a seventh aspect of the present invention is the lightweight ground survey machine according to the sixth aspect of the present invention, wherein the lightweight ground survey machine is movably attached to the support column along the support column and is attached to the support column at a predetermined position. And a holding portion that holds the upper side of the guide rod.

  According to this invention of Claim 7, the upper side of a guide rod can be hold | maintained in a predetermined position with respect to a support | pillar part with a holding | maintenance part.

  In the ground investigation method according to the present invention as set forth in claim 8, the driving force generated by the driving force generating portion is transmitted to the hammer portion via a pulley portion arranged on the upper side of the guide rod for guiding the hammer portion. In this way, the driving force generator generates the driving force generator with the weight of the hammer portion applied to the pulley portion in the reaction force transmission portion that constitutes the support portion supported on the investigation ground on the lower side and supporting the pulley portion on the upper side. The hammer part is lifted while acting, and the knocking block attached to the head of the boring rod on which either the sampler capable of collecting the sample of the investigation ground at the tip part or the tip cone is attached is guided from above. The hammer section guided by the rod is struck by free fall, the N value of the survey ground by the one is measured, the one outer peripheral surface with respect to the N value and the survey ground The influence of the friction is corrected by the correction means.

  According to the eighth aspect of the present invention, the driving force generated by the driving force generating portion is transmitted to the hammer portion via the pulley portion arranged on the upper side of the guide rod that guides the hammer portion, and The hammer part is lifted to the pulley part side. On the other hand, a sampler capable of collecting a sample of the investigation ground and a tip cone are attached to the tip of the boring rod, and a knocking block is attached to the head of the boring rod. Then, the knocking block is hit with a free fall of the hammer portion guided by the guide rod from above, and the N value of the investigation ground by the one is measured. Since this N value is considered to be affected by friction between the one outer peripheral surface and the investigation ground, the influence of friction between the one outer peripheral surface and the investigation ground is corrected by the correcting means.

  Therefore, in the present invention, it is possible to obtain the N value of the investigation ground without performing boring by a mud circulation type boring machine, and equipment such as a rotary excavation mechanism such as a drill and a circulation mechanism such as a pump becomes unnecessary. Further, since it is sufficient that the driving force generation unit can generate a driving force enough to lift the hammer portion, the driving force generation unit can be downsized, and the weight of the driving force generation unit can be reduced. However, if the driving force generation unit is reduced in weight, it is considered that when the hammer unit is lifted by the driving force generated by the driving force generation unit, the driving force generation unit itself is lifted by the reaction force of the force for lifting the hammer unit.

  Here, in this invention, the pulley part which supports a hammer part is supported by the upper side of a support part, and the lower side of the said support part is supported by the investigation ground. Then, the hammer portion is lifted while the self-weight of the hammer portion applied to the pulley portion is applied to the driving force generating portion by the reaction force transmitting portion constituting the support portion. For this reason, when the hammer portion is lifted, the reaction force of the force for lifting the hammer portion applied to the driving force generating portion can be offset by the weight of the hammer portion.

  The ground investigation method according to the present invention described in claim 9 is the ground inspection method according to claim 8, wherein an expanded cylinder having a larger outer diameter than a standard penetration test sampler capable of performing a standard penetration test is provided at the tip of the boring rod. The N-value of the survey ground is measured by attaching to the survey ground and penetrating into the survey ground to the test depth, replacing the diameter-expanded cylinder with the standard penetration test sampler.

  According to the present invention as set forth in claim 9, an expanded cylinder having an outer diameter larger than that of a standard penetration test sampler capable of a standard penetration test is attached to the tip of the boring rod and penetrated into the investigation ground to the test depth. . Then, the diameter expansion cylinder is replaced with a standard penetration test sampler, and the standard penetration test sampler is inserted into the investigation ground from the bottom of the hole formed in the investigation ground with the diameter expansion cylinder. Measure the value. For this reason, the influence of the friction between the outer peripheral surface of the standard penetration test sampler and the survey ground on the N value of the survey ground obtained by the penetration of the standard penetration test sampler can be suppressed.

  The ground investigation method according to the present invention as set forth in claim 10 includes a known first N value in a predetermined ground stored in a storage unit and a known second N value when the one is penetrated into the predetermined ground. The calculation unit calculates the N value of the survey ground based on the previously obtained relationship and the N value obtained by driving one of the two into the survey ground.

  According to the tenth aspect of the present invention, a known first N value in a predetermined ground and a known second N value when any one of the sampler and the tip cone penetrates into the predetermined ground in the storage unit. The previously obtained relationship is stored. And the N value of the said investigation ground is calculated based on the said relationship memorize | stored in the memory | storage part in the calculation part, and the N value obtained when the said one was driven into the investigation ground.

  As described above, the lightweight ground survey machine according to the first aspect of the present invention can reduce the weight of the ground survey machine to a weight that can be easily transported to mountainous areas and the like, and can further improve the properties of the ground. It has an excellent effect that it can be accurately determined.

  The lightweight ground survey machine according to the second aspect of the present invention has an excellent effect that the property of the survey ground can be determined under the same conditions as the standard penetration test.

  The lightweight ground survey machine according to the third aspect of the present invention can reduce the resistance when the sampler penetrates into the survey ground than the resistance when the standard penetration test sampler penetrates into the survey ground. It has an excellent effect of being able to.

  The lightweight ground survey machine according to the present invention described in claim 4 has an excellent effect that the test result similar to the standard penetration test can be obtained while the number of times the sampler is penetrated is minimized.

  The lightweight ground investigation machine according to the present invention described in claim 5 has an excellent effect that the lifting of the driving force generation part can be suppressed by utilizing the weight of the hammer part even when the investigation ground is inclined. Have.

  The lightweight ground investigation machine according to the present invention described in claim 6 has an excellent effect of simplifying the transmission path to the driving force generating section of the weight of the hammer section.

  The lightweight ground survey machine according to the seventh aspect of the present invention can guide the hammer portion with the guide rod while the guide rod is stable even if the operator does not hold the upper side of the guide rod. It has an excellent effect that the safety and efficiency of work can be improved.

  The ground survey method according to the present invention described in claim 8 can reduce the weight of the ground survey machine to a weight that can be easily transported to mountainous areas and the like, and can more accurately determine the properties of the ground. It has an excellent effect.

  The ground investigation method according to the present invention described in claim 9 has an excellent effect that the property of the investigation ground can be determined under the same conditions as the standard penetration test.

  The ground investigation method according to the present invention described in claim 10 has an excellent effect that a test result similar to the standard penetration test can be obtained while the number of times the sampler or the tip cone is penetrated is minimized. .

It is a side view (1 direction arrow view illustration of FIG. 3) which shows the whole structure of the lightweight ground investigation machine which concerns on 1st Embodiment. It is a top view which shows the whole structure of the lightweight ground investigation machine which concerns on 1st Embodiment. It is a photograph which shows the example of the sample extract | collected with the lightweight ground investigation machine which concerns on 1st Embodiment. It is the graph which showed the relationship between the N value by the standard penetration test of the weathered ground of a metamorphic rock, and a massified ground, and the N value (NP value) by the lightweight ground investigation machine which concerns on 1st Embodiment when not using a correction means. It is a longitudinal cross-sectional view which shows the structure of the sampler used with the lightweight ground investigation machine which concerns on 1st Embodiment. It is a figure which shows the procedure of the ground investigation method which concerns on 1st Embodiment. It is a longitudinal cross-sectional view of the sampler used for the lightweight ground investigation machine which concerns on 2nd Embodiment. It is a side view (illustrated by 1 direction arrow of Drawing 9) showing the whole lightweight ground investigation machine composition concerning a 3rd embodiment. It is a top view which shows the whole structure of the lightweight ground investigation machine which concerns on 3rd Embodiment. It is a side view which shows a state when pulling out a boring rod with the lightweight ground investigation machine which concerns on 3rd Embodiment.

<First Embodiment>
Hereinafter, the lightweight ground investigation machine and the ground investigation method using the same according to the first embodiment will be described with reference to FIGS.

  As shown in FIG. 1, the penetration testing machine 10 as a “lightweight ground investigation machine” according to this embodiment includes a “boring rod 12”, a standard penetration test sampler 14 as a “sampler”, and a “knocking block (anvil)”. ) 16 ”,“ guide rod 18 ”,“ hammer part 20 ”,“ driving force generating part 22 ”,“ support part 24 ”, pulley 26 as“ pulley part ”, rope 28 as“ driving force transmitting part ”, and It is configured to include a “diameter expanding tube 86” as “correcting means”. Hereinafter, the description will be made generally in this order, but the configuration of the diameter-expanding cylinder 86 will be described in the description of the ground investigation method described later. The configurations of the boring rod 12, the standard penetration test sampler 14, the knocking block 16, the guide rod 18 and the hammer portion 20 are in accordance with JIS A1229.

  The boring rod 12 is formed in a straight rod shape (columnar shape) or a straight cylinder shape (cylindrical shape). Both end portions of the boring rod 12 are provided with a female screw portion (not shown), and a male screw portion of a boring rod coupling (hereinafter referred to as a coupling) (not shown) is screwed into the female screw portion. It has become. Further, the boring rods 12 are connected to each other by a coupling, and a plurality of the boring rods 12 are added and used. In a state where it is used, a knocking block 16 is attached to the head of the boring rod 12, and a standard penetration test sampler 14 is attached to the tip of the boring rod 12. The outer diameter DR of the boring rod 12 is set to 40.5 [mm].

  The standard penetration test sampler 14 is a so-called Raymond sampler. As shown in FIG. 5B and FIG. 6, a standard split barrel 32 and a standard connector head as a “standard shoe 30”, “standard barrel”. 34 is comprised. The standard penetration test sampler 14 has an outer diameter D1 of 51 ± 1 [mm] and an inner diameter d1 of 35 ± 1 [mm]. The standard connector head 34 is provided with a female screw portion. Then, one male screw portion of the coupling is screwed to the female screw portion, and the other male screw portion of the coupling is screwed to the female screw portion of the boring rod 12, so that the standard penetration test sampler 14 and A boring rod 12 is connected.

  The knocking block 16 is configured to include a columnar main body portion 16 </ b> A, and the outer diameter size of the main body portion 16 </ b> A is set to be equal to or larger than the outer diameter size of the boring rod 12. Further, male screw portions (not shown) are provided at both ends of the main body portion 16A, and the boring rod 12 is connected to one (lower side) male screw portion and the other (upper side) male screw portion. The guide rod 18 is connected.

  The guide rod 18 is formed in a straight rod shape or a straight cylinder shape, and a female screw portion (not shown) is formed at a lower end portion thereof. And the guide rod 18 and the knocking block 16 are connected by the internal thread part provided in the lower end part of the guide rod 18 being screwed by the male screw part of the upper side of the knocking block 16. The guide rod 18 is connected to the knocking block 16 and extends upward from the knocking block 16.

  The hammer unit 20 includes a drive hammer 36 (hereinafter referred to as “monken 36”) and a monken catcher 38. The monken 36 is made of steel and formed in a columnar shape with a main body 36A, and is formed in a U-shape that is provided integrally with the main body 36A on the upper surface of the main body 36A and whose lower side is open. It is comprised including the hanging metal fitting which is not illustrated. More specifically, the main body portion 36A is formed with an insertion portion (not shown) penetrating the main body portion 36A at the center portion in plan view, and the insertion portion is sized to allow the guide rod 18 to be inserted. Yes. An insertion portion (not shown) having a truncated cone shape is provided on the upper side of the main body portion 36A. The weight of the monken 36 is 63.5 ± 0.5 [kg].

  On the other hand, the monken catcher 38 includes a catcher main body 40 and a hanging portion 42 and can hold the monken 36. The catcher body 40 is provided with an insertion portion (not shown) through which the guide rod 18 can be inserted, and includes a pair of hooks (not shown) for holding the monken 36. Further, the catcher main body 40 is configured to be able to insert an insertion portion provided in the main body portion 36A of the monken 36 from below, and when the insertion portion is inserted into the catcher main body 40, the bottom portion of the insertion portion. Is held by a pair of hooks. The hanging portion 42 includes a shackle 44, a chain 46, and a hanging ring 48, and the monken catcher 38 is integrated with the monken 36, as will be described later via the hanging portion 42. It is suspended by a rope 28.

  The hammer portion 20 configured as described above is provided on the guide rod 18 when it is lifted to a predetermined height, specifically 760 ± 10 [mm], along the guide rod 18. A pair of hooks are pressed against a projection (not shown). When the pair of hooks are pressed against the protrusions, the hooks are released from the insertion part of the monken 36, the monken 36 is released from the holding state of the monken catcher 38, and the monken 36 is free toward the knocking block 16. It comes to fall.

  As shown in FIG. 2, the driving force generator 22 supports the small engine 50, the speed reducer 52, a hydraulic pump (not shown), a pulley type winch 54 (hereinafter referred to as a pulley 54), a hydraulic control device, and these. A pedestal 56 is included. The driving force generation unit 22 is configured to be disassembled for each component described above, and these components are configured to have a shape and a weight that can be carried manually. That is, the driving force generator 22 is configured to be assembled on site. Specifically, the small engine 50 is used as a power source of the driving force generation unit 22 and includes a driving unit (not shown) and a fuel tank in which fuel such as gasoline is stored. An output shaft provided in the drive unit is connected to the speed reducer 52.

  A hydraulic pump and pulley 54 are connected to the speed reducer 52, and an input from the small engine 50 is converted into a predetermined torque by the speed reducer 52 and output to the hydraulic pump and pulley 54. ing. The hydraulic pump is connected to a hydraulic control device 58 by a hydraulic hose (not shown), and the hydraulic control device 58 is used to operate the rod puller 60 as described later. These equipments are made of steel and are mounted on a pedestal portion 56 that is formed in a rectangular plate shape in plan view. It is attached. Note that the pedestal 56 is placed on the survey ground 62. The driving force generator 22 has the small engine 50 on the hammer unit 20 side, and a predetermined interval is provided between the hammer unit 20 end of the base unit 56 and the hammer unit 20 in plan view. Is placed in the state where

  The support portion 24 includes three “leg portions 64, 66, 68”, a hanger 70 as a “connecting portion”, and a “reaction force transmission portion 72”. The leg portions 64, 66, and 68 are each formed of a cylindrical member (round pipe) made of steel, and the upper end portions thereof are connected by a hanger 70. Further, the hanger 70 holds the leg portions 64, 66, 68 so as to be rotatable about the hanger 70, and the leg portions 64, 66, 68 have an angle with respect to the survey ground 62 and the leg portions 64, 66. , 68 can be adjusted. Further, a fixable base 74 is attached to the lower end portion of the leg portion 64, and a universal jack base 75 is attached to the lower end portions of the leg portions 66 and 68, and the fixable base 74 and the universal jack base 75 are attached. Thus, the support portion 24 is supported. Of the leg portions 64, 66, 68, the leg portion 64 is in a state where the lower end portion thereof is placed on the end portion of the pedestal portion 56 opposite to the hammer portion 20 via the fixable base 74. Is arranged. Further, the leg portions 66 and 68 have their lower end portions positioned on the opposite side of the driving force generating portion 22 with the hammer portion 20 interposed therebetween and are placed on the survey ground 62 via the universal jack base 75. Is arranged in.

  The reaction force transmission portion 72 includes a connection beam 76 as a “first erection member”, a connection beam 78 as a “second erection member”, a support column 80 as a “first transmission member”, and a “second transmission member”. The support pillar 82 is included. Each of the connecting beams 76 and 78 is formed of a cylindrical member (round pipe) made of steel, and the connecting beam 76 is bridged between the leg portion 64 and the leg portion 66 in the horizontal direction and is connected to the connecting beam 76. The beam 78 spans the leg portion 64 and the leg portion 68 in the horizontal direction.

  Further, the support columns 80 and 82 are each formed of a cylindrical member (round pipe) made of steel. The support column 80 has an upper end attached to the connecting beam 76 and a lower end abutted against a portion of the base portion 56 on the hammer portion 20 side. On the other hand, the upper end of the support column 82 is attached to the connecting beam 78, and the lower end of the support column 82 is in contact with the portion of the pedestal 56 on the hammer portion 20 side. A pipe clamp (pipe joint) (not shown) is used to connect the legs 64, 66, 68, the connecting beams 76, 78, and the support columns 80, 82.

  A pulley 26 is attached to the lower side of the hanger 70 in the support portion 24 configured as described above. The rope 28 is attached at one end thereof to a suspension ring 48 of the suspension portion 42 of the hammer portion 20 via an attachment member such as a hook attached to the end portion, and above the hammer portion 20. It extends to the side and is wound around a pulley 26. The rope 28 passing through the pulley 26 extends toward the driving force generator 22 and is wound around the pulley 54. That is, the rope 28 is configured such that the driving force generated by the driving force generator 22 is transmitted to the other side. A wire or the like can be used instead of the rope 28.

  In addition, although mentioned later in detail, in this embodiment, the standpipe 84 in which the standard penetration test sampler 14 and the boring rod 12 are inserted is set in the survey ground 62 when the ground survey is started. The stand pipe 84 is formed in a straight pipe shape (round pipe shape). The length of the stand pipe 84 is set shorter than that of the boring rod 12, and the inner diameter ds thereof is larger than the outer diameter D1 of the standard penetration test sampler 14. Is also set larger.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described. First, the outline | summary of the work procedure of the ground investigation using the penetration testing machine 10 which concerns on this embodiment is demonstrated, and the effect | action and effect of the penetration testing machine 10 which concern on this embodiment are demonstrated through the description. Thereafter, the operation and effect of the ground investigation method according to the present embodiment will be described again.

  First, a set of materials and equipment constituting the penetration testing machine 10 described above is mounted on a small crawler, and the set of materials and equipment is carried to a survey point such as a mountainous area through a patrol road. Next, the stand pipe 84 is penetrated perpendicularly to the ground surface 62A at the measurement point. In parallel with this, the boring rod 12, the standard penetration test sampler 14, the knocking block 16 and the guide rod 18 are connected, and the driving force generator 22 and the support 24 are installed at predetermined positions with respect to the measurement point. . The rope 28 is wound around the pulley 54 and the pulley 26, and the hammer portion 20 is suspended by the rope 28 in a state where the guide rod 18 is inserted into the hammer portion 20.

  When the above preparation is completed, the small engine 50 is driven. When the small engine 50 is driven, the driving force is input to the pulley 54 via the speed reducer 52, and the pulley 54 rotates. When the pulley 54 rotates, the driving force of the pulley 54 is transmitted to the hammer portion 20 by the rope 28, and the hammer portion 20 is pulled up along the guide rod 18. Then, when the hammer portion 20 is lifted to a predetermined height, the monken 36 held by the monken catcher 38 is released, and the monken 36 falls freely toward the knocking block 16.

  In the present embodiment, a standard penetration test sampler 14 capable of collecting a sample of the investigation ground 62 is attached to the tip of the boring rod 12, and the knocking block 16 is attached to the head of the boring rod 12. Is installed. Further, a guide rod 18 is disposed above the knocking block 16, and the lower end portion of the guide rod 18 is connected to the knocking block 16 and extends to the upper side of the knocking block. Then, the monken 36 that has fallen freely while being guided by the guide rod 18 as described above hits the knocking block, and the standard penetration test sampler 14 is driven into the survey ground 62, so that the N value ( Hereinafter, the N value obtained by the penetration testing machine 10 is referred to as an NP value). At this time, a sample of the survey ground 62 is taken inside the standard penetration test sampler 14. That is, in this embodiment, a penetration test can be performed according to a standard penetration test.

  In the penetration test according to this embodiment, one data is obtained at 1 [m] in the standard penetration test, whereas two data are obtained at 1 [m] as described later. That is, in the penetration test according to the present embodiment, when the penetration is 50 [cm], the penetration test is temporarily stopped, and the standard penetration test sampler 14 is removed. Thereafter, a new standard penetration test sampler 14 is mounted on the boring rod 12 and the next 50 [cm] penetration test is started.

  And as above-mentioned, in this embodiment, since a penetration test is performed without performing a boring with a mud circulation type boring machine, excavation water is not contained in the sample of the investigation ground 62. As a result, in this embodiment, as shown in FIGS. 3 (A) and 3 (B), the detailed structure of the geology, that is, the landslide surface and the small fault can be easily grasped. It became possible to obtain a sample.

  By the way, in this embodiment, as described above, it is possible to obtain the NP value of the survey ground 62 without performing drilling by a mud circulation type boring machine, such as a rotary excavation mechanism such as a drill and a circulation mechanism such as a pump. Equipment is not required. Further, since the driving force generator 22 only needs to be able to generate a driving force enough to lift the hammer portion 20, it is possible to use the small engine 50 as a power source of the driving force generator 22. As a result, the driving force It is possible to reduce the weight of the generation unit 22.

  However, when the driving force generation unit 22 is reduced in weight, when the hammer unit 20 is lifted by the driving force generated by the driving force generation unit 22, the driving force generation unit 22 itself is lifted by the reaction force of the lifting force of the hammer unit 20. Can be considered. Here, in this embodiment, the lifting force of the driving force generation unit 22 is suppressed by suppressing the reaction force of the force for lifting the hammer unit 20 by using the weight of the hammer unit 20.

  Specifically, the pulley 26 to which the weight of the hammer portion 20 is applied is supported by a hanger 70 disposed on the upper side of the support portion 24, and below the leg portions 64, 66, and 68 constituting the support portion 24. The side is supported on the survey ground 62 directly or via the pedestal 56. When the hammer portion 20 is lifted, the weight of the hammer portion 20 applied to the pulley 26 acts on the driving force generation portion 22 via the reaction force transmission portion 72 that constitutes the support portion 24. For this reason, when the hammer portion 20 is lifted, the reaction force of the force for lifting the hammer portion 20 is offset by the weight of the hammer portion 20. As a result, in the present embodiment, it is not necessary to fix the driving force generator 22 to the survey ground 62 with a member such as an anchor.

  Incidentally, in Table 1, the penetration method, machine weight, performance, and the like of the conventional ground survey machine and the penetration testing machine 10 according to the present embodiment are compared and shown. The following points can be read by comparing the case where the conventional ground survey machine is used with the penetration test machine 10 according to the present embodiment using this table.

  First, the survey ground 62 cannot be sampled with anything other than the standard penetration testing device. In the standard penetration test, the survey ground is sampled only in the 30 [cm] section of the 1 [m] test section, so the remaining 70 [cm] section of the test section is sampled. The state cannot be grasped. In other words, in order to obtain continuous geological data, it is necessary to perform all-core sampling in another hole. On the other hand, in this embodiment, it is possible to obtain continuous geological materials as shown in FIG.

  In addition, when conducting ground surveys by standard penetration tests, it is possible to respond even if the N value of the survey ground is about 50, and the maximum depth is a boring equipped with a rotary drilling mechanism such as a drill and a circulation mechanism such as a pump. By drilling with a machine, it is possible to achieve a depth that can reach the support ground of the foundation such as a power transmission tower, so that the required performance can be satisfied. On the other hand, the total weight of the equipment used for ground investigation by the standard penetration test reaches 1 [t]. For this reason, as already explained, in order to transport the standard penetration testing equipment and its associated equipment, it is necessary to lay a temporary monorail etc. from a position where it can be transported by the vehicle to the survey point. Are forced to install heavy equipment and transport heavy objects, leading to problems such as longer work schedules, heavy labor, and higher costs.

  As can be seen from the above description, the penetration tester 10 according to the present embodiment can reduce the weight of the penetration tester 10 to a weight that can be easily transported to mountainous areas.

  Further, in the present embodiment, by adjusting the arrangement of the three leg portions 64, 66, 68 of the support portion 24, the position of the pulley 26 and the hammer portion 20 with respect to the penetration position of the standard penetration test sampler 14 is adjusted. Can be easily aligned. Furthermore, the weight of the hammer portion 20 from the legs 64 and 66 is applied to the driving force generator 22 by the connecting beam 76 spanned between the leg 64 and the leg 66 and the support column 80 attached to the connecting beam 76. Communicated. In addition, due to the connecting beam 78 spanned between the leg portion 64 and the leg portion 68 and the support column 82 attached to the connecting beam 78, the weight of the hammer portion 20 from the leg portions 64, 68 is reduced to the driving force generating portion 22. Is transmitted to. For this reason, in this embodiment, even if the investigation ground 62 is inclined, the lifting of the driving force generation unit 22 can be suppressed using the weight of the hammer unit 20.

  On the other hand, in FIG. 4, a plurality of plots are plotted with the N value obtained in the standard penetration test as the vertical axis and the NP value obtained with the penetration tester 10 as the horizontal axis, and obtained using a method such as the least square method. A graph is shown. The straight line L1 indicates the relationship between the N value and the NP value in the weathered ground of the metamorphic rock, and the straight line L2 indicates the relationship between the N value and the NP value in the massified ground. As shown in this figure, in the weathered ground of metamorphic rocks, the N value and the NP value are almost the same, and the NP value obtained by the penetration testing machine 10 is equivalent to the N value obtained by the standard penetration test. I understand that you can handle it.

  However, in the massified ground, there is a gap between the N value and the NP value. This is considered because the NP value of the survey ground 62 obtained as described above is affected by the friction between the outer peripheral surface of the standard penetration test sampler 14 and the survey ground 62. Therefore, a means for correcting the influence of the friction between the outer peripheral surface of the standard penetration test sampler 14 and the investigation ground 62 on the NP value is required. And in this embodiment, the ground investigation method shown below implement | achieves coexistence of the weight reduction of the penetration testing machine 10, and the exact determination of the property of a ground.

<Ground survey method>
Hereinafter, the ground investigation method according to the present embodiment will be described with reference to FIGS. 5 and 6. First, with reference mainly to FIG. 5A, the configuration of the diameter-expanded cylinder 86 used in the ground survey method will be described.

  As shown in part in FIG. 6, the enlarged diameter cylinder 86 includes a large diameter shoe 88, a large diameter barrel 90, and a large diameter connector head 92. The diameter-expanding cylinder 86 has an outer diameter D2 set to 54 [mm] and an inner diameter d2 set to 42 [mm]. The diameter-expanded cylinder 86 is connected to the boring rod 12 via a coupling in the same manner as the standard penetration test sampler 14. That is, the diameter expansion cylinder 86 is configured to be exchangeable with the standard penetration test sampler 14.

  Next, an example of the work procedure of the ground investigation method will be shown with reference to FIG. Not only this work procedure but also other procedures using the penetration testing machine 10 may be performed.

  First, as described above, the penetration testing machine 10 is installed at the measurement point, and the diameter-expanding cylinder 86 is attached to the tip of the boring rod 12. Then, as shown in FIG. 6A, the diameter-expanding cylinder 86 is penetrated into the survey ground 62 to the measurement depth of the NP value.

  Next, as shown in FIG. 6B, the diameter-expanding cylinder 86 is pulled out. Thereby, the investigation ground 62 is drilled with a diameter larger than the outer diameter D1 of the standard penetration test sampler 14.

  Next, as shown in FIG. 6C, the diameter-expanded cylinder 86 is replaced with the standard penetration test sampler 14, and the standard penetration test sampler 14 is formed in the hole of the survey ground 62 formed by the diameter-expanded cylinder 86. Gently lower to the bottom of the hole. Then, according to the standard penetration test, the standard penetration test sampler 14 is penetrated into the 30 [cm] survey ground 62, and the NP value is measured.

  Next, as shown in FIG. 6D, the standard penetration test sampler 14 is pulled out, and a sample of the survey ground 62 collected by the standard penetration test sampler 14 is collected. Although details will be described in the third embodiment, a rod puller 60 is used for pulling out the diameter-expanding cylinder 86 and the standard penetration test sampler 14.

  Next, as shown in FIG. 6E, the standard penetration test sampler 14 and the diameter-expanded cylinder 86 are exchanged. The diameter-expanded cylinder 86 is driven 30 cm to increase the diameter of the hole formed in the above-described process in the investigation ground 62, and the diameter-expanded cylinder 86 penetrates 20 cm from the hole bottom of the hole. To do. In the present embodiment, by repeating the above procedure, the NP value is measured every 50 [cm] of the survey ground 62 and the sample of the survey ground 62 is collected.

  Thus, in this embodiment, the friction between the outer peripheral surface of the standard penetration test sampler 14 and the survey ground 62 can be suppressed, and the property of the survey ground 62 can be determined under the same conditions as in the standard penetration test. In addition, as described above, in this embodiment, since the penetration test is performed without performing the boring by the mud circulation type boring machine, the survey ground 62 does not include drilling water. For this reason, in this embodiment, compared with a general standard penetration test, the property of the ground can be determined more accurately.

Second Embodiment
Next, the penetration testing machine 100 according to the second embodiment of the present invention will be described. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  The present embodiment is characterized in that the penetration test is performed using only one type of sampler, that is, the “small-diameter sampler 102”. Further, the penetration testing machine 100 according to the present embodiment has a second feature in that it includes a hard disk as a “storage unit” and a personal computer (not shown) provided with a CPU as a “calculation unit”. That is, the penetration testing machine 100 according to the present embodiment can also be regarded as a ground survey system.

  First, the configuration of the small-diameter sampler 102 will be described with reference to FIG. The small diameter sampler 102 includes a standard shoe 30, a “small diameter split barrel 104”, and a standard connector head 34 (not shown in FIG. 7). The outer diameter D3 of the small-diameter split barrel 104 is set to be smaller than the outer diameter D1 of the standard split barrel 32 and larger than the outer diameter DR of the boring rod 12. Specifically, the outer diameter D3 of the small diameter split barrel 104 is set to 49 [mm].

  The hard disk has an N value (hereinafter referred to as a “known first N value”) obtained by performing a standard penetration test on a predetermined ground such as sandy soil or true sand soil, and the penetration testing machine 100 using the ground. The relationship (for example, the graph shown in FIG. 4) with the NP value (hereinafter referred to as “known second N value”) obtained by performing the penetration test is stored.

  Then, in the CPU, from the relationship between the NP value obtained by performing the penetration test by the penetration testing machine 100 on the survey ground 62 and the known first N value and the known second N value stored in the hard disk, The N value can be calculated.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  In this embodiment, since the outer diameter D3 of the small diameter split barrel 104 constituting the small diameter sampler 102 is smaller than the outer diameter D1 of the standard split barrel 32, the surface area of the outer peripheral surface of the small diameter split barrel 104 is the outer periphery of the standard split barrel 32. It becomes smaller than the surface area of the surface. When the small-diameter sampler 102 is inserted into the survey ground 62, the small-diameter split barrel 104 whose outer diameter is smaller than that of the standard shoe 30 is formed in the hole formed in the survey ground 62 by the standard shoe 30 constituting the small-diameter sampler 102. Will pass through. For this reason, the friction between the small-diameter sampler 102 and the survey ground 62 can be made smaller than the friction between the standard penetration test sampler 14 and the survey ground 62. Therefore, in this embodiment, the resistance when the small-diameter sampler 102 penetrates into the survey ground 62 can be reduced than the resistance when the standard penetration test sampler 14 penetrates into the survey ground 62.

  In this embodiment, a predetermined relationship between a known first N value in a predetermined ground and a known second N value when the small-diameter sampler 102 penetrates the predetermined ground is stored in the hard disk of the personal computer. ing. Then, the N value of the survey ground 62 is calculated based on the relationship stored in the hard disk by the CPU and the NP value obtained by driving the small-diameter sampler 102 into the survey ground 62. For this reason, in this embodiment, it is possible to obtain a test result similar to the standard penetration test while minimizing the number of times the small-diameter sampler 102 is penetrated. In the present embodiment, the small-diameter sampler 102 is used. However, a standard penetration test sampler 14 or a tip cone may be used. Specifically, an N value obtained by performing a standard penetration test on a predetermined ground on a hard disk and a penetration test by a penetration tester 100 configured to include the standard penetration test sampler 14 and the tip cone on the ground are performed. What is necessary is just to memorize | store the relationship with NP value obtained by this.

<Third Embodiment>
Next, a penetration tester 110 according to a third embodiment of the present invention will be described with reference to FIGS. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  The present embodiment is characterized in that the “support portion 112” includes the “support portion 114” and the pulley beam 116. Specifically, the support portion 112 includes a column portion 114, a pulley beam 116, two pulleys 26, a “holding portion 118”, four “leg portions 120”, and a hanger 122.

  The support column 114 is formed in a straight pipe shape (round pipe shape), and a pulley beam 116 extending in the horizontal direction is attached to an upper end portion thereof by an attachment member (not shown), and a lower end portion thereof is attached to the pedestal portion 56. Similarly, it is attached with an attachment member (not shown). That is, in this embodiment, the support | pillar part 114 functions as a reaction force transmission part. Moreover, the part comprised by the support | pillar part 114 and the pulley beam 116 in the support part 112 is comprised by the T shape by the side view. In addition, the lower end part of the support | pillar part 114 is arrange | positioned in the vicinity of the edge part by the side of the hammer part 20 in the base part 56. FIG.

  A pulley 26 is attached to each end of the pulley beam 116 in the longitudinal direction, and the rope 28 is wound around the pulley 54 from the hammer portion 20 via the pulley 26. That is, in this embodiment, the part comprised including the pulley beam 116 and the two pulleys 26 functions as a pulley part. In the present embodiment, the driving force generator 22 is arranged with the hydraulic control device 58 on the hammer unit 20 side. One end of the pulley beam 116 is located immediately above the pulley 54, and the other end of the pulley beam 116 is located directly above the stand pipe 84.

  On the other hand, a hanger 122 is attached to the central portion in the longitudinal direction of the support column 114, and one end of the leg 120 having the same configuration as the leg 64 and the like is attached to the hanger 122. It is attached so as to be rotatable about 122. The other end of the leg 120 is fixed to the survey ground 62 by an anchor 124. In the present embodiment, the pedestal portion 56 is also fixed to the survey ground 62 by the anchor 124.

  The holding portion 118 includes a pipe-shaped slide portion 126 configured to be able to insert the support column portion 114, a pipe-shaped mounting portion 128 configured to be able to insert the guide rod 18, and the slide portion 126 and the mounting portion 128. It includes a prismatic connecting portion 130 that connects and extends in the horizontal direction. Each of the slide portion 126 and the attachment portion 128 is provided with a female screw portion (not shown) penetrating in the radial direction.

  Then, in a state where the column portion 114 is inserted into the slide portion 126, a fastening member (not shown) is screwed from the outside in the radial direction of the slide portion 126, and the fastening member is brought into contact with the column portion 114. The holding part 118 is held with respect to the column part 114. That is, the holding unit 118 is configured to be held at a predetermined position with respect to the column unit 114. In addition, in a state where the upper end portion of the guide rod 18 is inserted into the attachment portion 128, a fastening member (not shown) is screwed from the outside in the radial direction of the attachment portion 128, and the fastening member is attached to the end portion. By the contact, the guide rod 18 is held by the mounting portion 128.

  In addition, although it is the same also in 1st Embodiment and 2nd Embodiment mentioned above, as FIG. 10 shows, the rod drawing machine 60 is used for extraction of the boring rod 12. As shown in FIG. Specifically, the hydraulic control device 58 and the rod puller 60 are connected by hydraulic hoses 132 and 134. In parallel with this, the connection state between the boring rod 12 and the guide rod 18 is released and lowered onto the investigation ground 62 of the hammer portion 20. When the rod puller 60 is operated by the hydraulic control device 58 in a state where the boring rod 12 is gripped by the gripper 136 of the rod puller 60, the gripper 136 is pushed up by the jack 138, and the boring rod 12 is pulled out. This operation is repeated until the boring rod 12 is completely pulled out from the survey ground 62. In the penetration testing machine according to the first embodiment and the second embodiment, when the rod puller 60 is used, the driving force generation unit 22 is rearranged so that the hydraulic control device 58 is on the hammer unit 20 side. There is a need.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  In the present embodiment, since the support portion 114 can support the hammer portion 20 and transmit the hammer portion 20 to the driving force generation portion 22 of its own weight, the driving force generation portion 22 of the hammer portion 20 has its own weight. The transmission path can be simplified.

  Further, in the present embodiment, since the upper side of the guide rod 18 can be held at a predetermined position with respect to the support column 114 by the holding portion 118, the operator does not have to hold the upper side of the guide rod 18. The hammer portion 20 can be guided by the guide rod 18 in a state where the guide rod 18 is stable.

  Further, in the present embodiment, the driving force generating unit 22 is arranged with the hydraulic control device 58 on the hammer unit 20 side. Further, the support portion 112 is configured in a T shape in a side view, and one end portion of the pulley beam 116 is located immediately above the pulley 54, and the other end portion of the pulley beam 116 is It is located immediately above the stand pipe 84. Therefore, the hydraulic control device 58 and the rod puller 60 can be connected by the hydraulic hoses 132 and 134 without rearranging the driving force generator 22, and the boring rod 12 can be quickly pulled out.

[Supplementary explanation of the above embodiment]
In the second embodiment described above, using the personal computer, from the relationship between the NP value obtained by the penetration testing machine 100 and the known first N value and the known second N value stored in the hard disk, the investigation ground 62 Although the N value has been calculated, the present invention is not limited to this. For example, the known first N value and the known second N value may be displayed on a display such as a data logger, and the operator may determine the N value of the survey ground 62 from the NP value obtained by the penetration testing machine 100.

  Further, in the first embodiment described above, the support portion 24 is configured to include the three leg portions 64, 66, and 68. However, the present invention is not limited to this, and various configurations such as a configuration having four leg portions are possible. Can take a configuration. Furthermore, the configuration of the support portion 112 in the third embodiment described above is not limited to the configuration having four legs, and may be changed to a configuration having three legs, or no legs are provided. It is good also as a structure.

  In addition, the configuration of the support portion 112 and the like in the third embodiment can be applied to the first embodiment and the second embodiment. Moreover, the support | pillar part 114 of the support part 112 may also be comprised not only in a round pipe shape but in a square pipe shape or H-shaped steel shape. In addition, when the support | pillar part 114 is made into such a structure, the structure of the holding | maintenance part 118 also respond | corresponds to the structure of the support | pillar part 114.

10 Penetration testing machine (lightweight ground investigation machine)
12 Boring rod 14 Sampler for standard penetration test 16 Knocking block 18 Guide rod 20 Hammer part 22 Driving force generating part 24 Support part 26 Pulley (pulley part)
28 Rope (driving force transmission part)
30 Standard shoe 32 Standard split barrel (standard barrel)
62 Survey ground 64 Legs 66 Legs 68 Legs 70 Hanger (connection part)
72 Reaction force transmission part 76 Connecting beam (first erection member)
78 Connecting beam (second erection member)
80 Support pillar (first transmission member)
82 Support pillar (second transmission member)
86 Diameter expansion cylinder 100 Penetration testing machine (lightweight ground investigation machine)
102 Small sampler (sampler)
104 Small-diameter split barrel (barrel)
110 Penetration testing machine (lightweight ground investigation machine)
112 Supporting part 114 Posting part (reaction force transmission part)
118 Holding part

Claims (10)

A boring rod formed in a straight rod shape or a straight cylinder shape;
A sampler attached to the tip of the boring rod and penetrating into the investigation ground and capable of collecting a sample of the investigation ground;
A knocking block mounted on the head of the boring rod;
A guide rod having a lower end connected to the knocking block and extending above the knocking block and formed in a straight rod shape or a straight cylinder shape;
A hammer part that falls freely while being guided by the guide rod and hits the knocking block;
A driving force generator that is mounted on the investigation ground and generates a driving force by operating;
A pulley part disposed above the upper end of the guide rod;
One side is attached to the hammer part, extends to the upper side of the hammer part, extends toward the driving force generation part via the pulley part, and the driving force generated by the driving force generation part is on the other side. A driving force transmission unit to be transmitted;
Correction means for correcting the influence of friction between the outer peripheral surface of the sampler and the investigation ground with respect to the N value obtained by driving the sampler into the investigation ground;
A reaction force transmission unit that supports the pulley unit on the upper side and is supported on the survey ground directly or via a member on the lower side, and causes the weight of the hammer unit applied to the pulley unit to act on the driving force generation unit. A support portion configured to include,
Lightweight ground surveying machine. The sampler is a standard penetration test sampler capable of performing a standard penetration test,
The correction means is configured to include a diameter-expanded cylinder that is replaceable with the standard penetration test sampler and has a larger outer diameter than the standard penetration test sampler.
The lightweight ground investigation machine according to claim 1. The sampler includes a standard shoe that constitutes a standard penetration test sampler capable of performing a standard penetration test,
The outer diameter dimension of the barrel constituting the sampler is set to be smaller than the outer diameter of the standard barrel constituting the standard penetration test sampler and larger than the outer diameter of the boring rod.
The lightweight ground investigation machine according to claim 1. The correction means includes a storage unit storing a predetermined relationship between a known first N value in a predetermined ground and a known second N value when the sampler is inserted into the predetermined ground, and the relationship And a calculation unit capable of calculating the N value of the survey ground based on the N value obtained by driving the sampler into the survey ground.
The lightweight ground investigation machine of Claim 1 or Claim 3. The support portion includes three leg portions and a connecting portion that connects the leg portions at an upper portion of the leg portion,
The pulley part is attached to the connecting part,
The reaction force transmission unit includes a first erection member spanned between any two of the three legs, and a combination different from the two legs of the three legs. A second erection member spanned between any two of the legs, an upper side attached to the first erection member and a lower side attached to the driving force generation unit, and an upper side corresponding to the first erection member A second transmission member that is attached to the second erection member and whose lower side is attached to the driving force generator;
The lightweight ground investigation machine as described in any one of Claims 1-4. The reaction force transmission part is configured to include a straight rod-like or straight cylinder-like column part in which the pulley part is attached to the upper side and the lower side is attached to the driving force transmission part.
The lightweight ground investigation machine as described in any one of Claims 1-4. It further has a holding part that is attached to the support part so as to be movable along the support part and that can be held with respect to the support part at a predetermined position and holds the upper side of the guide rod.
The lightweight ground investigation machine according to claim 6. The driving force generated by the driving force generating part is transmitted to the hammer part via the pulley part arranged on the upper side of the guide rod that guides the hammer part, thereby supporting the pulley part on the upper side and Lifting the hammer part while causing the self-weight of the hammer part applied to the pulley part to act on the driving force generating part in the reaction force transmission part constituting the support part supported on the investigation ground on the lower side,
Freedom of the hammer part guided by the guide rod from above the knocking block attached to the head of the boring rod with either the sampler capable of collecting the sample of the investigation ground at the tip or the tip cone Hit with a fall,
Measure the N value of the survey ground by the one,
Correcting the influence of friction between the one outer peripheral surface and the investigation ground with respect to the N value by a correction means;
Ground survey method. A diameter expansion cylinder having a larger outer diameter than the standard penetration test sampler capable of standard penetration test is attached to the tip of the boring rod and penetrated into the investigation ground to the test depth,
Replacing the diameter-expanded cylinder with the standard penetration test sampler and measuring the N value of the survey ground;
The ground investigation method according to claim 8. A predetermined relationship between the known first N value in the predetermined ground stored in the storage unit and the known second N value when the one penetrates the predetermined ground, and the one is driven into the survey ground. Based on the obtained N value, the calculation unit calculates the N value of the investigation ground.
The ground investigation method according to claim 8.