JP2007270608A - Soil sampling device and soil sampling construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize not only availability but also high efficiency by guidance excavation when sampling soil. <P>SOLUTION: An excavation tool 1 is jacked by the guidance excavation up to a sampling point in the ground from aboveground. A long size cylindrical sampling pipe B is sent from aboveground into an outer tool 6 of the excavation tool 1, and is jacked in the ground on its tip via a penetration port 8a of an outer bit 8 existing on the tip of the outer tool 6. Thus, a large quantity of soil sample columns 52 can be taken in a sampler 44 of the sampling pipe B. Thus, high efficiency can also be realized when sampling the soil. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a technique for collecting a soil sample from a desired position on the ground for, for example, investigating the contamination status of soil contaminated with harmful substances.

In the soil contamination survey of the ground, soil samples are collected from the survey area of the ground. Among existing soil sampling methods, there is a method of sampling soil samples by largely excavating the ground to be investigated from the ground surface in the depth direction. However, for example, if there is an obstacle such as a factory in operation, excavation from the ground surface cannot be performed, and its application is limited to implementation in an investigation environment with a high degree of excavation freedom. Even if there are no obstacles on the ground, it takes a lot of time and money to excavate the ground. In order to overcome these limitations, soil sampling methods that do not excavate the ground surface have been proposed (Patent Documents 1 and 2).

In this method, a drill head equipped with a sampling mechanism penetrates from the ground surface, and "guided excavation (curved boring)" that combines straight excavation and curved excavation performed by injecting a drilling fluid from the tip of the drill head. Drill to the survey area and take the soil sample into the sampling mechanism. A soil sample is collected by repeating the excavation and sampling process at each sampling point, and multipoint data in a two-dimensional plane or three-dimensional space regarding the type and concentration of the contaminant is obtained from the soil sample. To understand the distribution of soil contamination.
JP 2001-64956 A JP 2001-64957 A

Since this method can collect soil samples at non-open-cutting and arbitrary sampling points, it is possible to investigate a more useful soil contamination situation, but there is a problem in terms of efficiency. That is, in this method, a soil sample is taken into the drill head itself and collected. For this reason, it is difficult to collect a large number of soil samples at one time, and the actual number of samplings per day at the site is about several times. Therefore, it takes a lot of work days to collect soil samples at a density useful for the survey.

The present invention has been made against the background of the problems of the existing method as described above, and its purpose is to increase the efficiency of collecting soil samples.

In order to achieve the above object, the present invention is configured as follows.

(1) The present invention comprises a cylindrical rod laid by sampling excavation (curved boring) from the ground to a sampling point in the ground;
A soil sample having a soil sampling port at the tip, and a sampling tube that is inserted from the ground side into the rod laid at the sampling point and takes the soil sample at the tip of the rod from the soil sampling port. Provide a collection device.

In the present invention, the sampling pipe is sent from the ground side to the rod laid at the sampling point, and the soil sample is collected. Therefore, depending on the rod laid by induction excavation to the sampling point in the ground as in the existing technology, the soil sample Is not collected. For this reason, the collection amount of a soil sample can be made to depend on the length of a sampling tube, and a lot of soil sample pillars can be collected by one sampling. Therefore, the sampling efficiency of the soil sample can be significantly increased as compared with the above-described existing technique of sampling the soil sample by the drill head itself.

(2) The sampling tube of the present invention includes a sampler having the soil sampling port at the tip and an extension rod extending to the ground.
Since the sampling tube has an extension rod, the sampling tube can be freely inserted into and removed from the laid rod. Therefore, it is possible to increase the degree of freedom of the collection work such as once collecting the sampling tube and then collecting the soil sample again with the sampling tube.

(3) The present invention includes a cylindrical outer rod laid by induction excavation from the ground to a sampling point in the ground;
An inner rod that can be inserted into and removed from the outer rod and is attached to the outer rod so as to close a tip opening of the outer rod during the guided excavation;
Provided with a soil sampling device having a soil sampling port at the tip, and a sampling tube that is inserted into the outer rod in place of the inner rod extracted from the outer rod during sampling of the soil and collects the soil sample from the soil sample sampling port To do.

At the time of guided excavation, the inner rod is attached to the outer rod and excavated to the sampling point of the soil sample, and at the time of sampling the soil sample, the sampling tube is sent instead of the inner rod to collect the soil sample. That is, the inner rod and the sampling pipe can be exchanged according to excavation or sampling while leaving the outer rod laid on the ground. Therefore, excavation and sampling can be performed efficiently. In addition, since the amount of soil sample collected can depend on the length of the sampling tube, a large amount of soil sample pillars can be collected by one sampling. Therefore, the sampling efficiency of the soil sample can be significantly increased as compared with the above-described existing technique of sampling the soil sample by the drill head itself.

(4) The present invention is a cylindrical outer rod laid by induction excavation from the ground to a sampling point in the ground,
An inner rod that can be inserted into and removed from the outer rod and is attached to the outer rod so as to close a tip opening of the outer rod during the guided excavation;
It has a sampler having a soil sampling port at the tip and an extension rod extending to the ground, and when the soil sample is collected, it is inserted into the outer rod instead of the inner rod extracted from the outer rod, and the soil sample is extracted from the soil sampling port. Provided is a soil sampling device including a sampling tube for sampling in a sampler.

At the time of guided excavation, the inner rod is attached to the outer rod and excavated to the sampling point of the soil sample. At the time of collecting the soil sample, the sampling rod is sent to the outer rod instead of the inner rod removed from the outer rod and the soil sample is collected. Therefore, like the present invention, the inner rod and the sampling pipe can be interchanged according to excavation or sampling, and excavation or sampling can be performed efficiently. Also, the amount of soil sample collected can be made dependent on the length of the sampling tube, and the soil sample collection efficiency can be greatly increased.
In the present invention, since the sampling tube has the extension rod, the sampling tube can be freely inserted into and removed from the outer rod. Therefore, it is possible to increase the degree of freedom of the collection work such as once collecting the sampling tube and then collecting the soil sample again with the sampling tube.

(5) The present invention is a cylindrical outer rod laid by induction excavation from the ground to a sampling point in the ground,
An inner rod that can be inserted into and removed from the outer rod and is attached to the outer rod so as to close a tip opening of the outer rod during the guided excavation;
A sampler having a soil sampling port at the tip and a latch part that can be engaged with and disengaged from the outer rod are inserted into the outer rod instead of the inner rod extracted from the outer rod when collecting a soil sample, and the outer rod is engaged by the latch part. And a sampling tube that is fixed to the inside of the front end side and collects a soil sample from the soil sampling port to the sampler.

At the time of guided excavation, the inner rod is attached to the outer rod and excavated to the sampling point of the soil sample.At the time of collecting the soil sample, the sampling tube is sent to the outer rod instead of the inner rod removed from the outer rod, and the engagement of the outer rod with the outer rod Obtain a state in which the sampling tube is fixed inside the tip side and collect a soil sample. Therefore, like the present invention, the inner rod and the sampling pipe can be interchanged according to excavation or sampling, and excavation or sampling can be performed efficiently. In addition, since the amount of collected soil sample can depend on the length of the sampler, the efficiency of collecting the soil sample can be greatly increased.
Further, in the present invention, the sampling tube can be fixed inside the outer end of the outer rod by the engagement of the latch portion with the outer rod. Since such secure fixing is obtained, in the present invention, it is only necessary to apply a driving force to the outer rod during excavation and sampling, and the object to which the driving force is applied is changed according to the difference between the excavation and sampling operations. There is no need to do. For this reason, if it is this invention, excavation and extraction can be performed efficiently.

(6) The sampling tube of the present invention further includes a check valve that keeps the soil sample taken into the tube from coming out of the soil sampling port.
Since the soil sample can be reliably held in the sampling tube or the sampler by the check valve, the soil sample can be efficiently collected.

(7) The inner rod of the present invention further includes an extension rod extending to the ground and an inner bit for excavating the ground.
Therefore, efficient excavation can be performed by both the outer rod and the inner rod of the inner rod. Further, when the extension rod extends on the ground, the inner rod can be used as a target to which a propulsive force is applied during ground excavation.

(8) The inner rod of the present invention includes a latch portion that can be engaged with and disengaged from the outer rod, and an inner bit that excavates the ground.
Therefore, efficient excavation can be performed by both the outer rod and the inner rod of the inner rod. Further, since the inner rod is provided with a latch portion that can be engaged and disengaged with respect to the outer rod, the inner rod can be securely fixed at the time of guided excavation.

(9) Further, the inner rod of the present invention has a length accommodated in the inner end of the outer rod.
For this reason, a double tube structure is not formed over the entire length of the outer rod. Therefore, since the outer rod and inner rod are lighter than the double pipe structure over the entire length, sufficient propulsive force for ground excavation can be obtained without relying on an increase in the size of the excavation propulsion device. It is possible to improve the excavation efficiency. Further, at the time of guided excavation, the outer rod and the inner rod are lightweight, and the propulsion resistance received from the ground by their own weight can be reduced, so that the responsiveness to the direction control can be enhanced.

(10) Further, the present invention includes an excavation propulsion device that imparts a one-push propulsion force with striking along the axial direction to at least one of the outer rod and the inner rod.
For this reason, even when it hits a gravel layer or a waste containing construction waste, which is difficult to excavate, it can be broken by hitting.

(11) In the present invention, a cylindrical sampling tube having a soil sampling port is fed into a tube of a cylindrical rod laid by induction excavation from the ground to a sampling point in the ground, and a soil sample at the tip of the rod is supplied. Provided is a soil sample collecting method for collecting from the soil sampling port.

In this construction method, the soil sample is taken in by the sampling tube without collecting the soil sample by the rod laid to the sampling point in the ground. For this reason, since the collection amount of a soil sample can be made to depend on the length of the sampling pipe penetrated into the ground, a lot of soil sample pillars can be collected according to the length of the sampling pipe propelled in the ground. Therefore, the efficiency of soil sample collection can be greatly increased compared with the existing method.

(12) In the present invention, the sampling tube further includes a sampler having the soil sampling port and an extension rod extending to the ground, and the sampling tube is placed in the tube of the rod laid at the sampling point. At the same time, the soil sample is taken into the sampler from the soil sampling port and collected by propelling it into the ground ahead through the tip opening of the rod.
Since the extension rod is thus provided, the soil sample can be collected while the sampling tube is freely inserted into and removed from the laid rod. Therefore, it is possible to increase the degree of freedom of the collection work such as once collecting the sampling tube and then collecting the soil sample again with the sampling tube.

(13) In the present invention, the rod is pushed along the sampling tube propelled into the ground to extend the laying length, and then the sampling tube is further pushed into the sampling to collect the soil sample. .
For this reason, the sampling of soil samples can be extended significantly with continuity. Therefore, it is possible to more accurately grasp the distribution of soil contamination based on line data rather than point data.

(14) The present invention recovers the inner rod of the double tubular excavating rod laid by induction excavation from the ground to the sampling point in the ground, and returns the inner rod to the ground. Provided is a soil sample collecting method for feeding a solid sampling tube and collecting a soil sample at the tip of the rod.

In this method, a cylindrical outer rod whose tip opening is closed with an inner rod is laid by induction excavation from the starting side on the ground to a sampling point in the ground. And excavation and extraction can be performed efficiently by exchanging the inner rod and the sampling pipe according to excavation or sampling while leaving the outer rod laid on the ground. In addition, the amount of soil sample collected can depend on the length of the sampling tube, and a large amount of soil sample pillars can be collected in one sampling. Therefore, the sampling efficiency of the soil sample can be significantly increased as compared with the above-described existing technique of sampling the soil sample by the drill head itself.

(15) In the present invention, the sampling tube further includes a sampler having a soil sampling port at the tip and an extension rod extending to the ground.
The sampling tube is fed into the outer rod tube remaining at the sampling point, and the soil sample is taken into the sampler from the soil sampling port by being propelled into the ground ahead through the tip opening of the outer rod. .
Since a soil sample can be collected by applying a propulsive force only to the sampling tube in this way, the soil sample can be collected with a small propulsive force as long as the outer rod is not propelled.

(16) The present invention further extends the laying length by propelling the outer rod along the sampling pipe propelled into the ground, and further collects the soil sample by propelling the sampling pipe into the sampling pipe. To do.
For this reason, the sampling of soil samples can be extended significantly with continuity. Therefore, it is possible to more accurately grasp the distribution of soil contamination based on line data rather than point data.

(17) The present invention further provides that the outer rod is laid by induction excavation with the tip opening closed with an inner rod at a sampling point in the ground from the ground. Then, the outer rod is driven to take in the soil sample from the opening at the tip, and the soil sample taken into the outer rod is collected by the sampling tube fed into the outer rod.
Since the outer rod is propelled to take the soil sample from the tip opening and the soil sample taken into the outer rod is collected by the sampling tube fed to the outer rod, the propulsion load or earth pressure applied to the sampling tube can be reduced. Therefore, compared with the case where the sampling tube itself is directly propelled to the ground, the occurrence of warping and deformation can be prevented. Therefore, a thin sampling tube having a large collection capacity can be used.

(18) In the present invention, a cylindrical outer rod is laid by induction excavation with the tip opening closed with an inner rod from the ground to a sampling point in the ground. The sampling tube having a sampler having a soil sampling port and a latch portion that can be engaged with and disengaged from the outer rod is fed in, and the sampling tube is fixed to the inside of the front end side of the outer rod by the latch portion. Providing a soil sample collection method that collects soil samples with a sampler.

Similarly to the present invention, excavation or sampling can be performed by exchanging the inner rod and the sampling tube, so that excavation and sampling can be performed efficiently. Further, since the amount of collected soil sample depends on the length of the sampling tube, the efficiency of collecting the soil sample can be greatly increased.
Further, in this construction method, the sampling tube can be fixed inside the outer end of the outer rod by the engagement of the latch portion with the outer rod. Because this kind of secure fixation can be obtained, in this construction method, it is only necessary to apply a propulsive force to the outer rod during excavation and sampling, and the object to which the propulsive force is applied is changed according to the difference between the excavation and sampling operations. Therefore, excavation and sampling can be performed efficiently.

(19) Further, in the present invention, after the sampling tube from which the soil sample has been collected by releasing the latch portion is removed from the outer rod, the inner rod is fed into the outer rod and the outer rod is driven to excavate to the next sampling point.
For this reason, the laying length of the outer rod can be extended, and the sampling of the soil sample can be continuously extended. Therefore, it is possible to more accurately grasp the distribution of soil contamination based on line data rather than point data.

(20) The present invention further performs guide excavation by applying to one of the outer rod and the inner rod a one-push propulsion force that involves striking along the axial direction thereof.
According to this, even when striking against a gravel containing a gravel layer or construction waste having a high degree of excavation during ground excavation, it can be broken by hitting.

According to the soil sampling apparatus and the soil sampling method of the present invention, even when there is an obstacle (such as a working factory) above the sampling point, the sampling point can be reached by non-cutting and an arbitrary route. In other words, it is highly useful by guided excavation. In addition to this, the amount of collected soil samples can be greatly increased according to the length of the sampling tube propelled to the ground, so that many soil samples can be collected in a short time and in a short period of time. In other words, high efficiency can be realized. Therefore, according to the present invention, an accurate soil contamination status survey can be economically performed.

Hereinafter, an embodiment of a soil sample collection device and a soil sample collection method according to the present invention will be described with reference to the drawings.

Soil sampling device of the first embodiment [FIGS. 1 to 6] ;
The soil sampler includes a guided excavator A and a sampling tube B.

Guided excavator A ;
The guided excavation apparatus A includes a excavation tool 1 (FIG. 1) and a rod portion 2 (FIG. 2). The recovery rod 3, which will be described later, the overshot 4 (FIG. 5), and the excavation propulsion device 5 (FIG. 9) are also provided as components of the guide excavation device A.

Drilling tool 1 ;
Each of the excavation tools 1 includes a steel outer tool 6 (FIGS. 1 and 2) and an inner tool 7 (FIGS. 1 and 3).

Outer tool 6 ;
The outer tool 6 includes an outer bit 8, a coupling 9, a sonde case 10, and a reducer 11 connected in order from the tip side. The outer tool 6 constitutes the “rod” and “outer rod” of the present invention together with the rod portion 2.

The outer bit 8 is formed in a substantially cylindrical shape, and a super steel tip 12 is implanted at the tip thereof, and an earth pressure receiving surface 13 inclined with respect to the cylinder axis direction is formed. On the inner surface of the outer bit 8, a front engagement receiving portion 14 is formed to which the inner tool 7 abuts in the excavation direction and is prevented from being pulled out. Reference numeral 15 (FIG. 2) denotes an engaging groove that engages with the inner bit 7 and prevents the inner bit 7 from rotating inside the outer bit 8.

The coupling 9 is formed in a substantially cylindrical shape, and a rear side engagement receiving portion 16 is formed on the inner surface of the inner tool 7 so that the inner tool 7 abuts in the retracting direction and is prevented from being pulled out.

The sonde case 10 has a substantially cylindrical shape that accommodates a sonde 17 that sends position information of the excavation tool 1 to the ground in order to excavate the ground by guided excavation (curved boring). Therefore, a signal transmission portion 18 made of hard resin or the like for facilitating the transmission signal of the sonde 17 is provided. The sonde case 10 is formed with a drilling fluid passage 19 penetrating the wall thickness along the longitudinal direction.

The reducer 11 is formed in a substantially cylindrical shape, and the rod portion 2 is connected to the rear end thereof.

Inner tool 7 ;
The inner tool 7 includes an inner bit 20, a latch part 21, a joint part 22, and a sonde storage part 23 connected in order from the distal end side. The inner tool 7 can be inserted into and removed from the outer tool 6 and the rod portion 2 described above. The inner tool 7 constitutes an “inner rod” in the present invention.

The inner bit 20 excavates the ground together with the outer bit 8 described above. Therefore, the super steel chip 12 is planted at the tip, and the earth pressure receiving surface 24 is formed. The earth pressure receiving surface 24 has the same inclination angle as the earth pressure receiving surface 13 of the outer bit 8 and forms a flush excavation surface. A plurality of engaging protrusions 25 are formed on the outer peripheral surface of the rear end portion of the inner bit 20 so as to be separated in the circumferential direction. The engagement protrusion 25 abuts in the excavation direction against the front engagement receiving portion 14 of the outer bit 8 and prevents the inner bit 20 from being pulled out. Grooves formed between the adjacent engagement protrusions 25 serve as a passage for the drilling fluid and communicate with a passage 26 formed in the inner bit 20. An injection port 27 is opened at the end of the passage 26, and the drilling fluid is jetted obliquely forward from here.

The latch portion 21 is necessary for the inner bit 20 to be engaged with and disengaged from the outer bit 8 (fixed by engagement and removed by disengagement). The latch portion 21 is provided with a shaft 28, and the front end portion thereof is inserted into and connected to the rear end opening of the inner bit 20. Two engaging blades 29 are attached to the shaft 28 by a rotating support shaft 30. Therefore, the engagement blade piece 29 can be opened and closed so as to open outward with respect to the shaft center of the shaft 28 and close inward with respect to the shaft center with the rotation support shaft 30 as an opening and closing shaft. . Each engagement wing piece 29 in the open state has its shoulder portion 29a engaged with the rear engagement receiving portion 16 of the coupling 9 described above. As a result, the inner bit 20 does not move backward with respect to the outer bit 8 even if it receives earth pressure during excavation. Further, each engagement blade piece 29 in the open state enters and engages with an engagement groove 15 (FIG. 2) formed on the inner peripheral surface of the rear end portion of the outer bit 8. As a result, the inner bit 20 is prevented from rotating relative to the outer bit 8. It is also possible to prevent the inner bit 20 from rotating by providing an engaging portion corresponding to the engaging protrusion 25 of the inner bit 20 on the inner peripheral surface of the outer bit 8. However, a height is required for engagement to prevent rotation, and if an engagement portion corresponding to the engagement protrusion 25 is provided in the outer bit 8, the inner diameter of the outer tool 6 is reduced, and the outer tool 6 The tube that can be inserted is also reduced. Because of this inconvenience, in this embodiment, the engagement blade piece 29 is also used as a detent for the inner bit 20 and is engaged with the engagement groove 15 of the outer bit 8.

The spring 31 incorporated inside the engagement wing piece 29 elastically urges the engagement wing pieces 29 to be closed inward to open outward. It is the operating rod 32 having a pointed shape that enters between the engagement blade pieces 29 that are opened by the spring 31 and maintains the opened state. The operating rod 32 is movable forward and backward with respect to the shaft 28 (between the engagement blade pieces 29) under the guide of the guide inner surface 28b (FIG. 4) of the rear end portion 28a of the shaft 28. Specifically, a rear end portion of a latch case 33 that accommodates the shaft 28 and the engagement blade piece 29 fixed to the shaft 28 is fixed to the rear end portion 32 a of the operating rod 32. Here, when the operating rod 32 is pushed into the shaft 28, the operating rod 32 enters between the engaging blade pieces 29 as shown in FIG. On the other hand, when the operating rod 32 is pulled back with respect to the shaft 28, the operating rod 32 moves backward with respect to the shaft 28 as shown in FIG. At the same time, the latch case 33 fixed to the operating rod 32 also moves backward. By this retreat, the opening edge 33a of the latch case 33 is pushed inward so as to close the engagement blade piece 29 in the open state. Thus, the closed state of the engagement blade piece 29 is fixed. A spring 34 is attached to the inside of the latch case 33, and the latch case 33 is normally positioned so that the engaging wing piece 29 shown in FIGS.

The joint portion 22 is a universal joint that can be bent by one rotation support shaft 35, and the inner tool 7 can be bent in the longitudinal direction.

The sonde storage unit 23 stores the sonde 17 in the inner sonde case 36. Reference numeral 37 denotes a protective material for the sonde 17. A spear 38 is attached to the rear end portion of the inner sonde case 36, and an overshot 4 used when the inner tool 7 is recovered is connected to the engaging head 38a. Specifically, the connecting operation is as shown in FIG.

Overshot 4 ;
That is, the recovery rod 3 is connected to the rear end portion of the overshot 4. The rod portion 2 (42) extends on the starting side, and the overshot 4 and the wire line 3 are fed into the pipe from the open end. Then, the overshot 4 reaches the reducer 11 of the outer tool 5 as shown in FIG. When the overshot 4 is fed as it is, the spear 38 passes through the insertion hole 39a with a guide inclined surface of the case 39 and abuts against the latch piece 40 at the back thereof. Due to the impact, the latch piece 40 is opened via the rotation support shaft 41 and engaged with the engagement head 38a of the spear 38 as shown in FIG. After that, the recovery rod 3 is pulled back from the starting side. By merely pulling back, the engagement blade piece 39 is closed by the above-described mechanism, and the engagement of the engagement blade piece 39 with the engagement groove 15 and the engagement with the rear side engagement receiving portion 16 of the shoulder portion 39a are released. Then, the inner tool 7 is pulled out from the outer tool 6.

Rod part 2 ;
As shown in FIG. 2, the rod portion 2 is configured by connecting a plurality of extension rods 42 in the longitudinal direction according to the excavation length. Each extension rod 42 has a hollow cylindrical shape, and the inside serves as a passage for the drilling fluid. The drilling fluid passing therethrough passes through the inside of the drilling tool 1 including the passage 19 of the sonde case 10, and is injected obliquely forward from the injection port 27 through the passage 26 of the inner bit 20. Further, the extension rod 42 has a thin middle portion so that it can be bent easily during curved excavation.

Excavation propulsion device 5 ;
The excavation propulsion device 5 uses a single-push propulsive force that includes at least one combination of continuous rotation or continuous rotation stop along the axis of the rod portion 2 and striking or striking stop along the axial direction of the rod portion 2. In addition to the part 2, it is directly transmitted to the outer tool 6. It is indirectly transmitted to the inner tool 7 through the outer tool 6. For this reason, the excavation propulsion device 5 is provided with a feeding device including a rotation mechanism and a striking mechanism. A drilling fluid feed mechanism is also provided.

Sampling tube B [Fig. 6] ;
The sampling tube B is configured by connecting a plurality of cylindrical extension rods 43 in the longitudinal direction in the same manner as the rod portion 2 described above, and connecting a sampler 44 having a diameter larger than that of the extension rod 43 at the tip thereof. The extension rod 43 and the sampler 44 can be inserted into and removed from the outer tool 6 described above. A soil collection port 44 a is opened at the tip of the sampler 44. From here, the soil can be taken into the pipe of the sampler 44.

Soil sampling device of the second embodiment [FIGS. 7 and 8] ;
The soil sampler includes a guided excavator C and a sampling tube D.

Guided excavator C [FIG. 7] ;
The induction excavation apparatus C includes an excavation tool 1 (FIG. 7) and a rod portion 2 (FIG. 2). The recovery rod 3, the overshot 4 (FIG. 5), and the excavation propulsion device 5 (FIG. 9) described in the first embodiment are also provided as components of the induction excavation device C. Among these, the configuration of the excavation tool 1 is different from the first embodiment.

The excavation tool 1 according to the present embodiment includes an outer tool 6 and an inner tool 7 as in the first embodiment. However, the outer tool 6 differs from the first embodiment in the configuration of the outer bit 45 and the point that the coupling 46 is provided. The inner tool 7 is different from the first embodiment in that the inner bit 47 has no drilling fluid passage. Others are substantially the same as those in the first embodiment, and thus redundant description is omitted.

A drilling fluid passage 48 is formed in the outer bit 45, and the drilling fluid is jetted forward from its injection port 49. Therefore, the inner bit 47 of this embodiment has no drilling fluid passage. The coupling 46 is formed with a rear engagement receiving portion 50 that engages with a sampling tube D described later.

Sampling tube D [FIG. 8] ;
The sampling tube D is configured by connecting a cylindrical sampler 51 having a soil sampling port 51 a in order from the tip side and a latch portion 21 that can be engaged with and disengaged from the outer tool 6.

The sampler 51 is provided with a check valve 51b that is opened and closed with rubber, metal, or the like in the soil sampling port 51a, so as to prevent the soil sample taken therein from coming out. A plurality of engaging projections 51 c are formed on the outer peripheral surface of the sampler 51 so as to be separated in the circumferential direction. The engagement protrusion 51c hits the front side engagement receiving portion 14 of the outer bit 45 in the excavation direction and prevents the sampling tube D from coming off. A groove formed between the adjacent engaging protrusions 51 c serves as a passage for the drilling fluid and communicates with the passage 48 of the outer bit 45.

The basic configuration and operation of the latch portion 21 are the same as those of the latch portion 21 provided in the inner tool 7 of the first embodiment. However, in this embodiment, the engagement blade piece 29 is connected to the rear engagement receiving portion 50 of the coupling 46. On the other hand, it is designed to engage and disengage. The latch portion 21 and the above-described sampler 51 can be inserted into and removed from the outer tool 6 of the second embodiment. A spear 38 similar to that attached to the rear end of the innersonde case 36 of the first embodiment is attached to the rear end of the latch portion 21. The engagement head 38a is connected to the overshot 4 used when the inner tool 7 is recovered. Accordingly, the sampling tube D can be recovered by the overshot 4 in the same manner as the inner tool 7.

Soil sampling method according to the first embodiment [FIGS. 9 to 12] ;
A first embodiment of a soil sample collecting method using the guided excavation apparatus A and the sampling pipe B of the first embodiment will be described.

First, the guided excavator A excavates to the ground sampling point where the soil sample is collected. The inner tool 7 is inserted and fixed to the outer tool 6 on the starting side, and the extension rod 42 is connected to the outer tool 6. These are made to penetrate into the ground by one-way propulsion using the excavation propulsion device 5. In the straight excavation, the rod portion 2 connected with a plurality of extension rods 42 is continuously rotated so that the earth pressure receiving surfaces 13 and 24 of the outer bit 8 and the inner bit 20 are not fixed at a specific rotation angle. In curved excavation, the rotation of the rod portion 2 is stopped and the earth pressure receiving surfaces 13 and 24 are fixed at a specific rotation angle. Then, the inclined earth pressure receiving surfaces 13 and 24 continuously receive the earth pressure from the ground, and the propulsion direction is changed to the injection direction of the drilling fluid. Curve digging is done by continuing this as it is.

Since only the excavation tool 1 has a double structure and the rod portion 2 is a single-pipe structure and is lightly equipped, it is easy to bend during curve excavation and can sufficiently perform curve excavation, which is superior to guided excavation. In addition to this, by reducing the propulsion resistance due to the weight reduction of the rod portion 2, the excavation efficiency of the induction excavation can be improved without depending on the enlargement of the excavation propulsion device 5.

In the process of the above straight excavation and curvilinear excavation, when hitting a gravel including a gravel layer or construction waste having a high excavation difficulty, the outer bit 8 and the inner bit 20 are hit through the rod portion 2. At this time, since the rod portion 2 is lightly equipped with a single pipe structure, a strong striking force can be achieved with the outer bit 8 without depending on a high-power striking mechanism in the excavation propulsion device 5 due to a decrease in propulsion resistance due to the weight reduction. It can be transmitted to the inner bit 20. Therefore, it is possible to continue digging through the difficult place without pulling it back and correcting the direction. Such blow excavation can also be carried out on the ground where excavation difficulty is low.

Through the combination of straight excavation and curved excavation as described above, even if there is an obstacle such as factory F in operation above the ground sampling point as shown in FIG. There is an advantage that excavation is possible and excavation can be performed in one step.

And if the sampling point which collects a soil sample is reached | attained (FIG. 9), the inner tool 7 will be collect | recovered from the outer tool 6 here. As described above with reference to FIG. 5, the recovery is performed by feeding the overshot 4 connected to the recovery rod 3 to the rod portion 2, connecting the overshot 4 to the spear 38, and pulling back the recovery rod 3.

Next, a soil sample is collected using the sampling tube B (FIG. 6). For this purpose, the sampling tube B is inserted from the rear end portion of the rod portion 2. When inserting, the extension rod 43 is added and the excavation propulsion device 5 repeats the operation of feeding the sampling tube B over its entire length. When this is repeated, the sampler 44 of the sampling tube B reaches the inside of the outer tool 6 that has become hollow due to the recovery of the inner tool 7 (FIG. 10). Further, the extension rod 43 is added and fed, whereby the sampler 44 propels the ground through the penetration port 8a that opens at the tip of the outer bit 8 (FIGS. 11 and 12). As a result, the soil sample column 52 is taken into the pipe through the soil sampling port 44a of the sampler 44 and collected (FIG. 11). Finally, if the sampling tube B is pulled back to the start side and collected, a necessary investigation can be performed on the soil sample column 52 on the ground. Thus, in this embodiment, a large amount of soil samples can be efficiently collected.

When the sampling tube B is propelled as described above, the sampling tube B is propelled so as to continuously feed the sampling tube B until a soil sample can be collected in the sampler 44 as shown in FIG. Can do. In this way, soil samples can be collected efficiently. Further, the sampling tube B can be propelled so as to repeat the feed and the temporary stop. By doing so, it is possible to prevent warping or deformation of the sampler 44 due to the action of an excessive propulsion load generated when continuously propelling without interruption.

Soil sampling method according to the second embodiment [FIG. 13] ;
A second embodiment of the soil sampling method using the guide excavator A and the sampling tube B will be described.

The construction method of this embodiment is the same as that of the first embodiment until the sampler 44 of the sampling tube B is propelled inside the outer tool 6 (FIG. 10). Next, in this embodiment, the outer tool 6 is propelled by straight excavation (FIG. 13A). Then, a soil sample is taken into the outer tool 6 from the penetration port 8a. And the sampling pipe | tube B is propelled within the pipe | tube of the outer tool 6 (FIG.13 (B)). As a result, the soil sample taken into the outer tool 6 is taken into the sampler 44 through the soil sampling port 44a. If the sampling tube B is propelled until it reaches the penetrating port 8 a at the tip of the outer tool 6, the soil sample column 52 can be collected in the sampler 44. Finally, the sampling tube B may be recovered on the ground.

As described above, the construction method according to the present embodiment has the effect of reducing the propulsion load acting on the sampling tube B in addition to the advantage that a large amount of soil sample can be efficiently collected as in the first embodiment. is there. That is, since the sampling pipe B is propelled so as to collect the soil sample once taken into the outer tool 6, the earth pressure and the propulsion load when propelling directly in the ground are not applied to the sampling pipe B. Therefore, the sampling tube B can be thinned to increase the collection capacity, and more soil samples can be collected than in the first embodiment.

Soil sampling method according to the third embodiment [FIG. 14] ;
A third embodiment of the soil sampling method using the guide excavator A and the sampling tube B will be described.

The construction method of the present embodiment is the same as that of the first embodiment until the inner tool 7 is collected from the outer tool 6. Next, in this embodiment, the outer tool 6 is propelled by straight excavation. Then, a soil sample is taken into the outer tool 6 from the penetration port 8a (FIG. 14A). Then, when the sampling tube B is inserted into the tube of the outer tool 6 (FIG. 14B) and propelled until it reaches the penetration port 8a, the soil sample is taken into the outer tool 6 through the soil sampling port 44a. Is taken in (FIG. 14C). In this way, the soil sample column 52 can be collected in the sampler 44. Finally, the sampling tube B may be recovered on the ground.

As described above, the construction method according to the present embodiment samples a soil sample in the outer tool 6 in the same manner as in the second embodiment, in addition to being able to efficiently collect a large amount of soil sample as in the first embodiment. Since sampling is performed with the pipe B, the propulsion load, earth pressure, etc. applied to the sampling pipe B can be reduced. Therefore, compared to the case where the sampling tube B itself is directly propelled to the ground, it is possible to prevent the occurrence of warping and deformation, and the thin sampling tube B having a large sampling capacity can be used.

In the construction method according to the present embodiment, the outer tool 6 is further propelled to extend the laying length as in the second embodiment, and then the sampling tube B is propelled to take the soil sample into the sampling tube B and collect it. Can do. According to this, it is possible to greatly extend the sampling of soil samples with continuity. Therefore, it is possible to more accurately grasp the distribution of soil contamination based on line data rather than point data.

Soil sampling method according to the fourth embodiment [FIG. 15] ;
A fourth embodiment of the soil sampling method using the guided excavator C and the sampling tube D will be described.

The construction method of this embodiment is the same as that of the first embodiment until the inner tool 7 is excavated to the sampling point by the outer tool 6 and the inner tool 7 (FIG. 7), and the inner tool 7 is collected at the overshot 4 at the sampling point. Next, in this embodiment, a soil sample is collected using the sampling tube D described in FIG. For this purpose, the sampling tube D is inserted from the rear end portion of the rod portion 2 and pushed toward the front end side of the outer tool 6 using a rod, pipe, hydraulic pressure of the drilling fluid, etc. By engaging the engagement blade piece 29 of the latch portion 21 with the side engagement receiving portion 50, the sampling tube D is fixed inside the outer end side of the outer tool 6. Since the sampling tube D is in a fixed state and the distal end side has a length protruding from the distal end of the outer bit 45, the distal end of the sampling tube D is positioned at the forefront in the excavation direction (FIG. 15). Thereafter, when the excavation propulsion device 5 applies propulsive force to the rod portion 2 to propel the outer tool 6, the sampling pipe D propelled together with the outer tool 6 excavates the ground, and enters the pipe through the soil sampling port 51 a of the sampler 51. The soil sample column 52 is taken in and collected (FIG. 15). Finally, if the sampling tube D is separated from the outer tool 6 by the overshot 4 and pulled back to the starting side and collected, the necessary investigation of the soil sample column 52 can be performed on the ground.

As described above, the construction method according to the present embodiment, in addition to the advantage that a large amount of soil sample can be efficiently collected as in the first embodiment, is also provided with the rear engagement receiver of the coupling 46 of the outer tool 6. The sampler 51 of the sampling tube D can be fixed to the inside of the front end side of the outer tool 6 by the engagement of the engagement blade piece 29 of the latch portion 21 with the portion 50. Since such secure fixing can be obtained, a propulsive force may be applied to the outer tool 6 via the rod portion 2 during excavation and sampling. That is, since it is not necessary to change the object to which the driving force is applied according to the difference between the excavation and sampling operations, the excavation and sampling can be performed efficiently.

The tip of the sampling tube D protrudes from the tip of the outer bit 45, and when the outer tool 6 is propelled, the sampling tube D (sampler 51) excavates the ground. For this reason, the soil sampled by the outer bit 45 is not collected by the sampler 51, but the soil can be sampled by the sampler 51 in the natural ground condition, and the soil contamination and the like can be accurately investigated. it can. In addition, when the tip of the sampling pipe D as shown in FIG. 15 protrudes from the tip of the outer bit 45 and is a discontinuous surface with the earth pressure receiving surface 13 of the outer bit 45, the earth pressure receiving surface 13, Since the area of 24 is reduced and the earth pressure receiving surface 13 of the outer bit 45 alone is insufficient for directional control, straight excavation by the sampling pipe D is possible. Therefore, the operation for rotating the outer tool 6 by the excavation propulsion device 5 may not be performed.

Unlike the first embodiment, the outer bit 45 has a drilling fluid passage 48 and is not provided in the inner bit 47. For this reason, when excavating the ground with the sampling pipe D, the ground can be softened by ejecting the excavating fluid from the injection port 49 of the passage 48. Therefore, it is possible to efficiently collect a soil sample, and it is possible to suppress damage to the sampler 51 that is subjected to excavation load.

Since the sampling port 51a of the sampler 51 is provided with the check valve 51b, the soil sample column 52 taken into the inside can be reliably held, so that the soil sample can be collected efficiently.

After sampling the soil sample column 52, the sampling tube D can be recovered from the outer tool 6 by releasing the latch portion 21. Therefore, the inner tool 7 can be fed into the outer tool 6 and the outer tool 6 can be driven to excavate to the next sampling point. According to this, since the laying length of the outer tool 6 can be extended, the sampling of the soil sample can be continuously extended. Therefore, it is possible to more accurately grasp the distribution of soil contamination based on line data rather than point data.

Other embodiments ;
The soil sample collection device and the soil sample collection method according to the embodiment described above are examples.

Another embodiment of the guided excavator A ;
First, the guided excavator A can be configured as the following embodiment.

In the above-described embodiment, one indirect portion 22 is provided in the inner tool 7, but the followability to curved excavation can be improved as a configuration provided in a plurality of locations.

In the above embodiment, the spear 38 that is the rearmost part of the inner tool 7 is located in the pipe of the reducer 11 that is the rearmost part of the outer tool 6, but is substantially located in the pipe of the outer tool 6 (reducer 11). It is good also as a form which protrudes to the rod part 2 specifically.

Although the recovery rod 3 is used in the embodiment, the wire line may be connected to the overshot 4 instead. Further, instead of the recovery rod 3 and the overshot 4, a hollow or solid rod that can be directly connected to the spear 38 may be used. Further, the spear 38 may have a threaded portion instead of the engaging head 38a, and a rod or the like having a threaded portion connectable thereto may be used.

As described above, the guided excavation apparatus A can be implemented in various other forms. However, it is basically sufficient that the sampling pipe B is inserted after the guided excavation to penetrate into the ground. The guided excavator A performs “one-sided propulsion” that propels while drilling from the starting side. For example, an apparatus described in Japanese Patent Application Laid-Open No. 2004-232304 by the present applicant is used. It is also possible to use the excavation apparatus A instead of the induction excavation apparatus A.

As another example of the guided excavator A, a guided excavator used in a so-called flow molding method can also be used (see, for example, JP-A-11-190190). As another embodiment of the soil sampling method using this, first, as shown in FIG. 16, the excavation rod 53 is propelled by induction excavation to reach the sampling point. An earth pressure receiving surface 53 a for performing direction control by linear excavation and curved excavation is formed at the tip of the excavation rod 53. When the sampling point is reached, the casing tube 54 is pushed from the start side so as to cover the outside of the excavation rod 53. The casing tube 54 is propelled along the excavation rod 53 to the tip while excavating the ground with the ring bit 54a attached to the tip, as shown in FIG. Next, after the excavating rod 53 is pulled back to the start side and collected, the sampling pipe B is propelled to the tip through the inside of the casing pipe 47 as shown in FIG. Thereafter, as in the first embodiment described above, the sampling tube B is propelled to the ground to collect a soil sample (steps of FIGS. 10 to 11), or in the same manner as in the second embodiment described above. A method in which only the tube 54 is propelled into the ground by linear excavation and a soil sample is taken in, and then the sampling tube B is propelled inside the casing tube 54 to collect the soil sample (steps of FIGS. 10 to 13), etc. In the same manner as in the third embodiment described above, only the casing tube 54 is propelled to the ground by linear excavation, the soil sample is taken in, and then the sampling tube B is inserted into the casing tube 54 to collect the soil sample. By performing (the process of FIG. 14), the soil sample column 52 can be collected in the pipe of the sampling pipe B. According to the above embodiment, since the casing tube 54 having a large diameter can be used, the sampling tube B inserted into the casing tube 54 can have a larger diameter than that of the above-described embodiment. Therefore, there is an advantage that more soil samples can be collected. In this embodiment, the casing tube 54 corresponds to the “rod” and “outer rod” in the present invention, and the excavation rod 53 corresponds to the “inner rod” in the present invention.

Other embodiments of the sampling tube B ;
About the sampling pipe | tube B, if it comprises as a rod which can be halved over the partial length or full length along a longitudinal direction, taking out from the pipe | tube of a soil sample column and the investigation of a contamination situation can be performed easily. Moreover, you may make it provide the slit which can visually observe the extraction | collection state of the soil sample pillar 52 in a pipe | tube.

Another embodiment of the guided excavator C ;
As for the inner bit 47 of the induction excavating apparatus C, the earth pressure receiving surface 24 is flush with the earth pressure receiving surface 13 of the outer bit 45 as shown in FIG. However, if only the straight excavation is performed, the inner tool 7 may be configured as shown in FIG. 18, for example (the outer tool 6 is the same as FIG. 7). The inner tool 7 includes an inner bit 55 and a latch portion 21. This can be suitably used, for example, when the soil sample column 52 is collected at a sampling point and then straightly excavated to reach another sampling point. Thus, by making the tip of the inner bit 55 the earth pressure receiving surface 13 of the outer bit 45 and the discontinuous surface (in this embodiment, a cylindrical shape), the area of the earth pressure receiving surface 13 as the entire excavation tool 1 is reduced, and the outer bit is reduced. Since only the earth pressure receiving surface 13 of 45 is insufficient for directional control, straight excavation can be performed without continuously rotating the outer tool 6.

Other embodiments of the sampling tube D;
In the above embodiment, the sampling tube D has a length that protrudes from the tip of the outer tool 6, but may have a length that does not protrude.

Another embodiment of the soil sampling method ;
In the embodiment described above, the example in which the outer tool 6 or the casing tube 54 is recovered after the sampling tubes B and D are recovered has been described. However, the sampling tubes B and D and the sampling tubes B and D can be simultaneously pulled back and recovered. According to this, the sampling tube B and the outer tool 6 or the casing tube 54 can be collected in one step, and the work efficiency of collecting the soil sample can be further increased.

The internal structure sectional view of the excavation tool by one embodiment. Sectional drawing of the outer tool and rod part of FIG. Sectional drawing of the inner tool of FIG. Operation | movement explanatory drawing of the inner tool of FIG. Explanatory drawing of connection operation | movement with the inner tool of FIG. 1, and the overshot by one Embodiment. Sectional drawing of the sampling pipe | tube B. FIG. The internal structure sectional view of other excavation tools. Sectional drawing of the sampling pipe | tube D. FIG. It is process explanatory drawing of the soil sample collection construction method by 1st Embodiment, and is a schematic sectional drawing in the ground which shows the arrival state of the excavation tool to a sampling point. FIG. 10 is a process explanatory diagram subsequent to FIG. 9 and is a cross-sectional view of the main part in the ground for explaining the laying state of the sampling pipe on the outer tool. It is process explanatory drawing following FIG. 10, and is sectional drawing of the principal part in the ground which shows the promotion state to the ground of the sampling pipe | tube B. FIG. 12 is a schematic cross-sectional view of the ground in FIG. 11. It is process explanatory drawing of the soil sample collection construction method by 2nd Embodiment, a part figure (A) is a promotion state explanatory view of the outer tool following FIG. 9, a part figure (B) is a promotion explanatory view of the sampling pipe B performed after that, FIG. 3C is an explanatory diagram of the end state of the promotion of the sampling tube B. It is process explanatory drawing of the soil sample collection construction method by 3rd Embodiment, a part figure (A) is a promotion state explanatory view of an outer tool, a part figure (B) is a promotion explanatory view of the sampling pipe B performed after that, part figure (C) Is an explanatory view of the end state of the promotion of the sampling tube B. FIG. It is process explanatory drawing of the soil sample collection construction method by 4th Embodiment, and is explanatory drawing which shows the completion | finish state of the promotion of an outer tool and the sampling pipe | tube D. FIG. In the process explanatory view of the soil sampling method according to another embodiment, a schematic cross-sectional view in the ground showing the propulsion state of the casing pipe performed after the excavation rod is propelled. FIG. 16 is a process explanatory diagram subsequent to FIG. 16, where a part (A) is a cross-sectional view of the main part in the ground after the casing pipe is propelled, and a part (B) is a cross-sectional view of the main part in the ground showing the process of laying the sampling pipe on the casing pipe . The internal structure sectional view of other excavation tools.

Explanation of symbols

A Guided excavator (first embodiment)
B Sampling tube (first embodiment)
C guided excavator (second embodiment)
D Sampling tube (second embodiment)
DESCRIPTION OF SYMBOLS 1 Excavation tool 2 Rod part 3 Recovery rod (linear body for recovery)
4 Overshot (Linear for collection)
5 Drilling propulsion device 6 Outer tool (rod, outer rod)
7 Inner tool (inner rod)
8 Outer bit 8a Through-hole 9 Coupling 10 Sonde case 11 Reducer 12 Super steel tip 13 Earth pressure receiving surface 14 Front engagement receiving portion 15 Engaging groove 16 Rear engagement receiving portion 17 Sonde 18 Signal transmitting portion 19 Path 20 Inner bit 21 Latch part (latch)
22 Joint part 23 Sonde storage part 24 Earth pressure receiving surface 25 Engagement protrusion 26 Passage 27 Injection port 28 Shaft 28a Rear end part 28b Guide inner surface 29 Engagement blade piece 29a Shoulder part 30 Rotating support shaft 31 Spring 32 Actuation rod 32a Rear End 33 Latch case 33a Open edge 34 Spring 35 Rotating support shaft 36 Innersonde case 37 Cushioning material 38 Spear 38a Engaging head 39 Case 39a Insertion hole 40 Latch piece 41 Rotating support shaft 42 Extension rod 43 Extension rod (Sampling) tube)
44 Sampler (sampling tube)
44a Soil sampling port 45 Outer bit 46 Coupling 47 Inner bit 48 Passage 49 Injection port 50 Rear side engagement receiving part 51 Sampler 51a Soil sampling port 51b Check valve 51c Engagement protrusion 52 Soil sample pillar 53 Excavation rod (inner rod)
53a Earth pressure receiving surface 54 Casing tube (outer rod)
54a Ring bit 55 Inner bit

Claims (20)

A cylindrical rod laid by guided excavation from the ground to the sampling point in the ground,
A soil sample having a soil sampling port at the tip, and a sampling tube that is inserted from the ground side into the rod laid at the sampling point and takes the soil sample at the tip of the rod from the soil sampling port. Collection device. The soil sampling apparatus according to claim 1, wherein the sampling tube has a sampler having the soil sampling port at the tip and an extension rod extending to the ground. A cylindrical outer rod laid by guided excavation from the ground to the sampling point in the ground,
An inner rod that can be inserted into and removed from the outer rod and is attached to the outer rod so as to close a tip opening of the outer rod during the guided excavation;
A soil sample collection device having a soil collection port at the tip, and a sampling tube that is inserted into the outer rod and collects a soil sample from the soil sample collection port instead of the inner rod extracted from the outer rod when collecting the soil sample. A cylindrical outer rod laid by guided excavation from the ground to the sampling point in the ground,
An inner rod that can be inserted into and removed from the outer rod and is attached to the outer rod so as to close a tip opening of the outer rod during the guided excavation;
It has a sampler having a soil sampling port at the tip and an extension rod extending to the ground, and when the soil sample is collected, it is inserted into the outer rod instead of the inner rod extracted from the outer rod, and the soil sample is extracted from the soil sampling port. A soil sampler having a sampling tube for sampling in a sampler. A cylindrical outer rod laid by guided excavation from the ground to the sampling point in the ground,
An inner rod that can be inserted into and removed from the outer rod and is attached to the outer rod so as to close a tip opening of the outer rod during the guided excavation;
A sampler having a soil sampling port at the tip and a latch part that can be engaged with and disengaged from the outer rod are inserted into the outer rod instead of the inner rod extracted from the outer rod when collecting a soil sample, and the outer rod is engaged by the latch part. A soil sample collecting device comprising: a sampling tube fixed to the inside of the front end side of the soil and for collecting a soil sample from the soil sampling port to the sampler. The soil sample collection device according to any one of claims 1 to 5, wherein the sampling tube is provided with a check valve that keeps the soil sample taken in the tube from coming out of the soil collection port. The soil sample collecting device according to any one of claims 3 to 6, wherein the inner rod includes an extension rod extending to the ground and an inner bit for excavating the ground. The soil sample collecting device according to any one of claims 3 to 7, wherein the inner rod includes a latch portion that can be engaged and disengaged with respect to the outer rod, and an inner bit that excavates the ground. The soil sample collecting device according to any one of claims 3 to 8, wherein the inner rod has a length that is accommodated inside the outer end of the outer rod. The soil sample collection device according to any one of claims 3 to 9, further comprising an excavation propulsion device that imparts a one-push propulsion force with striking along the axial direction to at least one of the outer rod and the inner rod. A cylindrical sampling tube having a soil sampling port is fed into a tube of a cylindrical rod laid by sampling excavation from the ground to a sampling point in the ground, and a soil sample at the tip of the rod is taken from the soil sampling port. Soil sampling method to collect. The sampling tube has a sampler having the soil sampling port and an extension rod extending to the ground;
The sample tube is fed into the tube of the rod laid at the sampling point and is propelled into the ground ahead through the opening at the tip of the rod, and the soil sample is taken into the sampler from the soil sampling port and collected. The soil sampling method according to claim 11. 13. The rod is pushed along the sampling tube propelled into the ground to extend the laying length, and then the sampling tube is further pushed into the sampling tube to collect the soil sample. Soil sampling method. The inner rod of the double tubular excavating rod laid by induction excavation from the ground to the sampling point in the ground is recovered by pulling it back to the ground, and the cylindrical sampling tube is fed into the outer rod pipe remaining on the ground. Soil sampling method to collect the soil sample at the tip of the rod. The sampling tube has a sampler with a soil sampling port and an extension rod extending to the ground,
The sampling tube is fed into the outer rod tube remaining at the sampling point, and the soil sample is taken into the sampler from the soil sampling port by being propelled into the ground ahead through the tip opening of the outer rod. The soil sample collection construction method according to claim 14. 16. The outer rod is propelled along the sampling tube propelled into the ground to extend the laying length, and then the sampling tube is further propelled to take a soil sample into the sampling tube and collect it. Soil sampling method. The outer rod was laid by induction excavation with the tip opening closed with the inner rod from the ground to the sampling point in the ground, and when the sampling point was reached, the inner rod was moved back to the ground side, and then the outer rod was The soil sample collecting method according to claim 14, wherein the soil sample is taken from the opening at the tip and is taken, and the soil sample taken into the outer rod is collected by a sampling tube fed into the outer rod. From the ground to the sampling point in the ground, a cylindrical outer rod was laid by induction excavation with the tip opening blocked by the inner rod, and when the sampling point was reached, the inner rod was removed from the outer rod and replaced with soil. A sampling tube including a sampler having a sampling port and a latch portion that can be engaged and disengaged with respect to the outer rod is fed, and the sampling tube is fixed to the inner end of the outer rod at the latch portion, and the outer rod is propelled to the sampler. A soil sampling method for collecting soil samples. 19. The soil sample collecting method according to claim 18, wherein after the sampling tube from which the soil sample has been collected by releasing the latch portion is removed from the outer rod, the inner rod is fed into the outer rod and the outer rod is driven to excavate to the next sampling point. The soil sample collecting method according to any one of claims 14 to 19, wherein at least one of the outer rod and the inner rod is subjected to guided excavation by applying a one-pushing propulsive force accompanied by striking along the axial direction thereof.

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