JP3801852B2 - Sample soil sampling method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sample soil collecting method for collecting sample soil by inserting it into an improved ground (soil cement body) immediately after construction, and a sample soil collecting apparatus used in this method.
[0002]
[Prior art]
In the soil improvement method that constructs a soil cement body by stirring and mixing the local ground soil and cement-based solidifying material liquid, sampling the sample soil for quality control of the constructed soil cement body is performed. Conventionally, immediately after the ground improvement work, a vinyl chloride pipe or the like is inserted into the improved ground to a predetermined depth, and before the soil cement body is completely hardened, the sample soil is collected by pulling up the vinyl chloride pipe. It was. There is also a method of collecting by core boring after the soil cement body is completely cured.
[0003]
[Problems to be solved by the invention]
However, in the case of a conventional cross-section sampling device such as a vinyl chloride pipe, when the pipe is pushed in, the soil cement has a high adhesive force, so the sample soil cannot be collected due to the so-called blocking effect in which the inner peripheral surface friction acts. There was a problem that the sample soil may be compressed to change its properties.
[0004]
In the case of vinyl chloride pipes, etc., the pipe is pulled up immediately after the construction and the soil cement body is hardened, and in the case of core boring, the improved soil after hardening is taken, so the quality control after the fact. In addition, there are problems such as time and cost.
[0005]
For this reason, it is conceivable to use the earth and sand collecting method disclosed in JP-A-10-147928. In this case, the sample soil sampling method is to insert an approximately U-shaped long sampling member having an open cross section having an open side surface into the improved ground immediately after the construction, and when reaching a predetermined depth, A side member is inserted into the improved ground from the side, the sample soil is cut off from the surrounding improved soil (soil cement) by this side member, and the long sampling member filled with the sample soil is pulled up to the ground.
[0006]
However, even in this method, in the case of highly viscous soil cement, the soil cement to be collected may be compressed in the depth direction due to friction between the inner surface of the long sampling member having an open cross section and the soil cement. .
[0007]
Japanese Patent Laid-Open No. 2000-1844 discloses a sample soil collecting device in which an opening is formed by cutting out a side wall in the longitudinal direction of a cylinder while leaving a part of the side wall of a hollow cylindrical body. This sample soil sampling device is intended to extract the sample soil by cutting the edge between the sample soil at the opening and the surrounding improved soil by rotating the hollow cylinder body in the improved ground and then rotating it. is there. Since this sample soil collecting device is a device that uses only a hollow cylindrical body, if the opening angle of the opening is increased, there will be no adhesion to hold the sample soil in the hollow cylindrical body, and the sample soil will fall And the opening angle must be around 120 degrees.
[0008]
However, in this device in which the opening angle of the opening is considerably smaller than 180 degrees, the peripheral wall surface of the cylindrical portion is considerably large as about 240 degrees, so that the inner surface of the hollow cylinder is improved as in the case of the U-shaped section device described above. The improved soil (soil cement) to be collected due to friction of the soil (soil cement) may be compressed in the depth direction.
[0009]
Also, since the opening is constantly open, when the hollow cylindrical body is collected on the ground, the surrounding improved soil (soil cement) and the sample soil must be pulled up while constantly rubbing in the improved body (soil cement). In addition to the possibility that the surrounding surface of the sample soil may be affected, the sample soil falls off from the opening that has come to the ground in the vertical state when the device comes out from the improved body (soil cement) to the ground. There is a fear.
[0010]
The present invention has been made to solve such problems. The purpose of the present invention is to easily and reliably collect the improved soil at a predetermined position without compressing it even in the case of improved soil having high viscosity. Another object of the present invention is to provide a sample soil sampling method and apparatus that can quickly collect improved soil that has not yet been solidified immediately after construction with an apparatus having a relatively simple configuration.
[0011]
[Means for Solving the Problems]
Claim 1 of the present invention is that two long members (such as half steel pipes) having a substantially semicircular cross-sectional shape are overlapped. In an open cross-sectional state with a substantially C-shaped plan view with the side opened. When it is inserted into the improved ground immediately after the completion of construction and reaches a predetermined depth, the length of the closed cross section (such as a substantially circular cross section) is increased by rotating the other long member around the central axis with respect to one long member. A sample soil sampling method is characterized in that a long sampling member is formed and the long sampling member is pulled up to the ground.
[0012]
According to a second aspect of the present invention, in the sample soil collecting method according to the first aspect, the long sample member is pulled up while discharging the solidifying material liquid (such as cement milk) from the tip of the long sample member. It is a collection method.
[0013]
Claim 3 of the present invention is composed of two long members (such as half-split steel pipes) whose cross-sectional shapes are substantially semicircular and can be overlapped, and one of the long members can rotate around the central axis. The other long member can be moved integrally with the one long member in the direction of the central axis and can be relatively rotated about the central axis. , An open cross-section long sampling member having a substantially C-shape in plan view with an open side surface This is a sample soil collecting device characterized by the above. For example, one (inner or outer) long member is connected to the tip of a rotation drive shaft or a rotation drive jig of the ground improvement machine, and the other (outer or inner) long member is connected to one long member. The pin is connected to the top of the pin by an engagement mechanism such as a pin groove.
[0014]
According to a fourth aspect of the present invention, there is provided the sample soil collecting apparatus according to the third aspect, wherein an injection tube is disposed along the long member. This injection tube may be provided on the outer surface of the outer long member, or may be provided on the inner surface of the inner long member. In short, it suffices if there is a thin injection tube that leads from the ground surface side to the lower side of the long member.
[0015]
Further, it is preferable to provide a bottom cover on the lower surface of the long member that opens when inserted into the improved ground and closes when pulled up. This bottom cover can be rotated horizontally or vertically by operating from the ground via a rotary lever or the like, so that the bottom surface of the long sampling member can be closed, or it is automatically raised by the resistance of soil when inserted. It opens automatically and closes automatically with earth pressure when pulling up.
[0016]
In the configuration as described above, since a long sampling member having an open cross section in which two substantially semicircular long members are overlapped is inserted into the improved ground immediately after construction, it is like a conventional closed cross section pipe. Thus, there is no blocking effect due to friction on the inner peripheral surface, the sample soil smoothly enters the sampling space of the long sampling member, and a continuous sample soil that is not compressed is obtained.
[0017]
When the predetermined depth is reached, by rotating one of the long members, this long member becomes a lid member covering the opening of the other long member, and a closed section long sampling member having a substantially circular shape in plan view is formed, Cylindrical sample soil is collected. By cutting the sample soil from the surrounding improved soil with one long member, the unsolidified sample soil immediately after construction can be reliably and quickly collected without dropping off.
[0018]
In the case of modified soil with high viscosity, the sample soil on one side is disturbed by compression due to friction by a long semi-circular sampling member with a substantially semicircular cross section when inserted, in the same manner as a conventional long cross-section sampling member with H-shaped steel or the like. However, since the sample soil on the other side is taken in by cutting the long member from the lateral direction, a healthy sample soil without disturbance is obtained.
[0019]
The strength of the soil cement is reduced by discharging the cement-based solidification material liquid using the injection tube when pulling up the sample soil collecting device and filling the space where the sample soil is collected with the cement-based solidification material. Is prevented.
[0020]
Injecting the cement-based solidifying material liquid into the lower part of the sample soil collecting device using the injection tube in this way is not limited to simply filling the space. When the sample soil collecting device is pulled up, the lower part is in a vacuum state. In addition, the so-called suction acts to make it difficult to pull up, and the collected sample soil may be pulled downward, which is also for the prevention.
[0021]
Therefore, air may be supplied instead of the cement-based solidifying material liquid for the purpose of avoiding such a lower vacuum state. In this case, the space from which the sample soil is collected may be left as it is, or this space may be filled later with a separately prepared cement-based solidifying material liquid injection pipe. However, as described above, it is preferable to discharge the cement-based solidifying material liquid when the sample soil collecting device is pulled up.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on the illustrated embodiment. FIG. 1 shows an example of the basic structure of a sample soil collecting apparatus according to the present invention. FIG. 2 shows a specific first embodiment of the sample soil collecting apparatus. FIG. 3 shows a second embodiment. FIG. 4 shows an example of the sample soil sampling method of the present invention. FIG. 5 shows a third embodiment. FIG. 6 shows a sample observation method according to the third embodiment.
[0023]
In FIG. 1, a sample soil collecting apparatus 1 is mainly composed of a long member 2 having a semicircular cross-sectional shape obtained by dividing a steel pipe and disposed inside, and a long member disposed on the outside in the same shape. 3, the inner elongate member 2 can be rotated around its central axis by appropriate operating means.
[0024]
As shown in FIG. 1 (i), the inner elongate member 2 and the outer elongate member 3 can be overlapped with the same direction of curvature by making the diameters slightly different, and the side surfaces opened during insertion. It can be set as the open section elongate sampling member 4 of a substantially C shape in plan view. By inserting such an open section long sampling member 4 into the improved soil A, there is no blocking effect due to friction on the inner peripheral surface as in the conventional closed section pipe, and the sample soil is in the sampling space of the long sampling member. Can smoothly enter, and it is possible to obtain a continuous sample soil that is not compressed.
[0025]
When inserted to a predetermined depth, the inner elongate member 2 slides along the inner surface of the outer elongate member 3 by rotating the inner elongate member 2 as shown in FIG. As shown in 1 (iii), the inner long member 2 becomes a lid member that covers the opening of the outer long member 3, and a closed section long sampling member 5 having a substantially circular shape in plan view is formed. Is collected. By cutting the sample soil B from the surrounding improved soil A with the inner long member 2, the unsolidified sample soil immediately after construction can be reliably and quickly collected without dropping off.
[0026]
In the case of modified soil with high viscosity, the sample soil B on the outer long member 3 side (left side) in FIG. ₁ May be disturbed by frictional compression, but the sample soil B on the inner long member 2 side (right side) in FIG. ₂ Is taken in by cutting the inner elongate member 2 from the lateral direction, so that a healthy sample soil without disturbance can be obtained.
[0027]
Although FIG. 1 shows the case where the inner elongate member 2 is rotated, the present invention is not limited to this, and the same effect can be obtained even when the outer elongate member 3 is rotated. That is, since the sample soil on the long member side on the rotated side is taken in by cutting from the lateral direction by rotation, it is a healthy sample soil without disturbance.
[0028]
In the first embodiment of FIG. 2, as shown in FIG. 2 (a), a cylindrical member 2a made of a circular steel pipe is integrally provided on the upper part of the inner long member 2 made of a semicircular steel pipe, and this cylindrical member 2a. A connecting shaft (square shaft) 11 is connected to the upper part of the connecting shaft via a flange joint 10. By connecting the lower end of the rotary drive shaft 12 of the ground improvement machine to the connection shaft 11, the sample soil collecting device 1 can be inserted into the improved ground as shown in FIG. The member 2 can be rotated around the central axis. However, the present invention is not limited to this, and it is also possible to push the sample soil collecting device 1 into the improved ground using a backhoe, a vibro hammer or the like and rotate the inner long member 2 with a handle or the like. However, if the length is difficult to rotate by hand or the cross-sectional diameter is large, as described above, the upper part should be a rectangular connecting shaft that can be connected to the rotation drive shaft of the ground improvement machine and mechanically rotated. Is preferred.
[0029]
As shown in FIG. 2 (b), the outer long member 3 made of a semicircular steel pipe is integrally provided with a cylindrical member 3a made of a circular steel pipe at the upper portion, and the cylindrical member 3a of the outer long member 3 is connected to the pin 14 The pin 14 is attached to the cylindrical member 2a of the inner elongate member 2 through the pin groove 15 of the outer elongate member 3, and the latch provided on the cylindrical member 2a is inserted. The upper elongate member 3 is prevented from moving upward by the ring 13, and the cylindrical member 2a and the cylindrical member 3a are connected by the pin 14 and the pin groove 15, so that as shown in FIG. 2 and the outer elongate member 3 are integrated with respect to the central axis direction so as to be relatively rotatable around the central axis.
[0030]
The pin 14 is detachably attached to the cylindrical member 2a of the inner long member 2 with a screw (see FIG. 3 (d) described in detail later), and the pin groove 15 is horizontal to the cylindrical member 3a of the outer long member 3. (See FIG. 2 (e)). At the time of assembling and inserting the sample soil collecting device, the inner long member 2 and the outer long member 3 are integrated in the central axis direction by locking the locking ring 13 and the pin 14 and the pin groove 15, and the pin 14 is rotated during rotation. By moving in the pin groove 15, the inner elongate member 2 can be rotated 180 ° with respect to the outer elongate member 3 fixed by peripheral friction with the improved soil.
[0031]
Further, a cement-based solidifying material liquid injection pipe 20 is provided on the outer surface of the outer long member 3, and a bottom cover 30 is provided at the lower end of the inner long member 2 to close the bottom surface after sampling the sample soil. ing.
[0032]
The solidifying material liquid injection tube 20 is attached such that the lower end nozzle slightly protrudes from the lower end of the outer long member 3, and the sample soil is discharged by discharging the cement-based solidifying material liquid when the sample soil collecting device is pulled up. The collected space is filled with cement-based solidifying material to prevent the strength of soil cement from decreasing. Since the solidified material liquid is supplied through the inside of the cylindrical member 2a of the rotary drive shaft 12, the connecting shaft 11, and the inner long member 2 of the ground improvement machine, the upper portion of the solidified material liquid injection pipe 20 and the discharge of the cylindrical member 2a are supplied. The outlet is connected by a flexible hose 21 so that the solidified material liquid can be supplied even if the inner long member 2 or the like rotates.
[0033]
Injecting the cement-based solidifying material liquid into the lower portion of the sample soil collecting device 20 using the solidifying material liquid injection tube 20 is not limited to simply filling the space. Since the lower part is in a vacuum state, not only is it difficult to pull it up, but also the sampled soil sample may be pulled downward. To prevent this, the injection tube 20 is used to lower the sample soil sampler. Cement-based solidifying material liquid is injected.
[0034]
In order to avoid such a lower vacuum state, air may be supplied through the injection pipe 20 instead of the cement-based solidifying material liquid. In this case, the space from which the sample soil is collected may be left as it is, or this space may be filled later with a separately prepared cement-based solidifying material liquid injection pipe. However, as described above, it is preferable to discharge the cement-based solidifying material liquid when the sample soil collecting device is pulled up.
[0035]
The bottom cover 30 has a planar shape capable of covering at least the semicircular cross section of the inner long member 2 as shown in the bottom view shown below in FIGS. 2 (a) and 2 (d). The lower end of the member 2 is attached with a screw or the like so as to be rotatable in the vertical direction. Therefore, when the sample soil sampling device is inserted, as shown in FIGS. 2 (c) and 2 (f), the sample soil rises vertically due to the resistance of the soil and does not disturb the sample soil. As shown in (f), it is possible to prevent the sample soil from falling because the soil pressure is lying horizontally. A support member 31 for holding the bottom cover 30 in a horizontal state is attached to the inner surface of the lower end of the inner long member 2 (see FIG. 2 (f)).
[0036]
The bottom cover is not limited to the automatic vertical rotation type described above, and may be a horizontal rotation type bottom cover 30 as shown in FIG. The bottom lid 30 can be opened and closed by a rotation lever 32 by an operation from the ground. The rotary lever 32 includes a bar 32a longer than the long members 2 and 3, and a handle 32b integrally provided at the upper end of the bar 32a. The rotary bottom cover 30 is fixed horizontally to the lower end of the bar 32a. To do. The bar 32a is rotatably supported and fixed to the outer surface of the outer long member 3 by a simple bearing (not shown), and the bar 32a is rotated 180 ° so that the long members 2 and 3 are pulled up. Cover the bottom surface. Further, the present invention is not limited to this, and the bottom lid 30 may be opened and closed in the vertical direction by an operation lever.
[0037]
In the second embodiment of FIG. 3, the cylindrical member 3 a of the outer long member 3 to which the solidifying material liquid injection pipe 20 is attached is attached to the connecting shaft 11 via the flange joint 10, and the outer long member 3 is rotated. It is configured. In this case, the upper end of the solidifying material liquid injection pipe 20 can be directly connected to the cylindrical member 3a, and the flexible hose 21 can be dispensed with.
[0038]
The configuration of the inner long member 2 in this case is similar to the configuration of the first embodiment, and the inner long member 2 is inserted from the lower side of the outer long member 3 with the pins 14 removed. The pin 14 is attached to the cylindrical member 2 a of the inner long member 2 through the pin groove 15 of the outer long member 3, and the cylindrical member 2 a and the cylindrical member 3 a are connected by the pin 14 and the pin groove 15. 2 and the outer elongate member 3 are integrated with respect to the central axis direction so as to be relatively rotatable around the central axis. As shown in FIG. 3 (d), the pin 14 is detachably attached to the cylindrical member 2a of the inner long member 2 by a screw. That is, the male screw 14a is integrally formed on the tip end side of the pin 14, and is screwed into the female screw hole of the cylindrical member 2a. Alternatively, the set screw 16 is screwed into the pin 14 and the female screw hole of the cylindrical member 2a.
[0039]
Further, a lid member 40 is provided at the lower end of the inner long member 2 so as to cover the discharge port of the solidifying material liquid injection tube 20, and the discharge port of the solidification material liquid injection tube 20 is blocked by the intrusion of the improved soil when the sample soil collecting device is inserted. Is prevented. At the time of pulling up, as shown in the side view of FIG. 3B and the bottom view shown below, the discharge port of the solidified material liquid injection pipe 20 is detached from the stationary lid member 40 by the rotation of the outer long member 3. The solidifying material liquid can be discharged.
[0040]
This lid member 40 can also be applied to the first embodiment of FIG. Further, in the first embodiment and the second embodiment, as shown in FIG. 3C, the improved soil can be prevented from entering by turning the nozzle of the solidifying material liquid injection pipe 20 sideways. In this case, it is not necessary to attach the lid member 40.
[0041]
In addition, you may make it attach the solidification material liquid injection | pouring pipe | tube 20 to the inner surface of the inner side elongate member (inner pipe | tube) 2, as shown in FIG. In FIG. 4, the lower end portion of the inner long member 2 protrudes from the lower end of the outer long member (outer tube) 3, and this protruding portion can be supported when placed horizontally on the ground.
[0042]
The sample soil is collected as follows using the sample soil collecting apparatus 1 having the above configuration (see FIG. 4). 4 is a type in which the inner long member 2 is rotated as in the first embodiment of FIG.
[0043]
(1) Immediately after the ground improvement work, connect the sample soil sampling device 1 to the rotary drive shaft of the ground improvement machine and insert it into the improved ground. At this time, as shown in FIG. 4 (c), the inner elongate member (inner tube) 2 and the outer elongate member (outer tube) 3 are overlapped, and a horizontal sectional view shown by a section cut along the line II is shown below. As shown in the figure, it is inserted in the state of the open section long sampling member 4 having a substantially C shape in plan view. In the case of the vertical rotation type, the bottom cover 30 is in a vertical state due to soil resistance as shown in FIG. 2 (c), and in the case of the horizontal rotation type, as shown in FIG. It is arranged outside a few.
[0044]
(2) When the sample soil collecting device 1 reaches a predetermined depth, the inner long member 2 is rotated 180 ° to trim the improved soil on one side surface. As shown in the lower part of FIG. 4D, a closed section long sampling member 5 having a substantially circular shape in plan view is formed, and a continuous columnar sample soil B is sampled without being solidified and compressed.
[0045]
(3) In the case of the horizontal rotation type bottom cover 30, the bottom of the long members 2 and 3 is closed by horizontally turning. In the case of the vertical rotation type, the bottom cover 30 is closed by the earth pressure and becomes a horizontal state. As shown in FIG. 4 (d), the closed section long sampling member 5 having a substantially circular shape in plan view with the bottom closed is pulled up and collected on the ground.
[0046]
(4) Remove the sample soil collection device 1 from the rotary drive shaft of the ground improvement machine so that the undisturbed sample soil can be observed or supplied from the undisturbed sample soil as shown in Fig. 4 (f). In order to obtain a specimen, the member on the rotated side is turned down, that is, in the above case, it is placed horizontally on the ground with the inner long member 2 facing down. The tip protruding portion of the inner long member 2 is supported by a cradle 50 such as wood.
[0047]
(5) As shown in FIG. 4 (g), the outer long member 3 covering the inner long member 2 is rotated 180 ° to observe the sample soil, and if necessary, the upper sample soil is removed with a scoop or the like. Remove and observe the undisturbed lower sample soil. If necessary, block sampling or specimen preparation for strength confirmation is performed.
[0048]
Next, a third embodiment of FIG. 5 will be described. In the third embodiment, the inner elongate member 2 is rotated as in the first embodiment, but the outer elongate member (outer tube) 3 is connected to the inner elongate member (inner tube) 2. Easy to attach and detach from the side. In other words, a pair of upper and lower holding members 6 made of a short semicircular steel pipe is provided on the upper part of the outer long member 3 made of a long semicircular steel pipe, and the upper part of the outer long member 3 and a pair of holding members 6, 6 forms a cylindrical member 3a ′ that can be attached to the cylindrical member 2a of the inner long member 2 from the side.
[0049]
The holding member 6 and the outer long member 3 are detachably fastened by a flange 7 and a bolt 8 as shown in FIG. Further, the pin groove 15 is formed by arranging the pair of upper and lower holding members 6 at a predetermined interval. This pin groove 15 can be formed at the center in the vertical direction of the cylindrical member 3a ′, and compared to the case where the pin groove (notch) 15 is positioned below as in the first embodiment of FIG. Strength can be increased. Further, when the apparatus is assembled or the apparatus is disassembled as shown in FIG. 6 (ii), the inner elongate member 2 and the outer elongate member 3 can be easily attached and detached. Further, a holding member 9 made of a semicircular steel pipe is also detachably attached to the lower portion of the outer long member 3 with a bolt 8 similarly to the holding member 6. The holding member 9 also serves as a rotation guide for the inner elongate member 2, and the inner elongate member 2 rotates smoothly.
[0050]
The inner elongate member 2 is the same as that of the first embodiment of FIG. 2, and the sample soil is collected by the procedure described above. At the time of observing the sample, the procedure is as follows (see FIG. 6).
[0051]
(1) Place the inner long member 2 horizontally and place it on the ground. The tip of the inner long member 2 is supported by a cradle 50 such as wood.
[0052]
(2) The bolt 8 of the outer long member 3 is removed, the outer long member 3 is lifted and removed from the inner long member 2, and the sample soil B is exposed.
[0053]
(3) The sample soil B has a possibility that the upper part on the outer long member 3 side is disturbed. ₁ And the lower part on the inner long member 2 side is a healthy sample soil B with no disturbance ₂ (See Fig. 1), and the upper sample soil B with a scoop 51 etc. ₁ And remove the lower sample soil B ₂ The observation surface is exposed and observed, and a specimen for measuring compressive strength and the like is prepared.
[0054]
The structure using the holding members 6 and 9 can be applied to the outer long member 3 even when the outer long member 3 rotates as in the second embodiment of FIG. Further, in the third embodiment of FIG. 5, the pin 14 does not need to be detachable and can be fixed to the cylindrical member 2 a of the inner long member 2.
[0055]
【The invention's effect】
Since this invention consists of the above structures, there can exist the following effects.
[0056]
(1) Inner peripheral surface like a conventional closed cross-section pipe, because a long sampling member with an open cross-section with two semi-circular long cross-section members inserted into the improved ground immediately after construction There is no clogging effect due to friction, the sample soil smoothly enters the sampling space of the long sampling member, and continuous sample soil that is not compressed can be obtained.
[0057]
(2) When a predetermined depth is reached, the sample soil can be cut from the surrounding improved soil by rotating one long member and closing the side opening of the other long member. The solid sample soil can be collected quickly and reliably without dropping off, and the quality control of the ground improvement body immediately after construction can be performed.
[0058]
(3) In the case of improved soil with high viscosity, even if the sample soil on one side is disturbed by frictional compression by a long semi-circular sampling member, the sample soil on the other side is Since it is taken in by cutting from the direction, a sound sample soil without disturbance can be obtained, and accurate sample observation, strength test, and the like can be performed.
[0059]
(4) The sampling can be easily and quickly performed with a device having a relatively simple configuration, and the cost can be reduced.
[0060]
(5) By discharging the cement-based solidifying material liquid at the time of pulling up, the space from which the sample soil is collected can be filled with the cement-based solidifying material, and the strength of the soil cement can be prevented from being lowered. Moreover, since the vacuum state at the time of pulling up can be canceled by injection | pouring of solidification material liquid, air, etc., it can pull up easily and can prevent fall of sample soil.
[0061]
(6) If the holding member made of a semicircular steel pipe or the like is detachably attached to the outer long member, the inner long member and the outer long member can be easily attached and detached.
[Brief description of the drawings]
FIG. 1 is an example of a basic structure of a sample soil collecting apparatus according to the present invention, and is a horizontal sectional view showing a state in each step.
FIG. 2 is a first embodiment of a sample soil collecting apparatus according to the present invention, wherein (a) is a vertical sectional view / horizontal sectional view of an inner elongated member, and (b) is a side view / bottom surface of an outer elongated member. (C) is a side view and bottom view when penetrating, (d) is a side view and bottom view when pulling up, (e) is a horizontal sectional view of the upper part of the long member, and (f) is a long member. FIG. 6 is a perspective view showing another example of the bottom lid.
FIG. 3 is a second embodiment of the sample soil collecting apparatus according to the present invention, wherein (a) is a side view / bottom view when penetrating, (b) is a side view / bottom view when pulling up, and (c). Is a cross-sectional view showing a modification of the solidifying material liquid injection tube, and (d) is a cross-sectional view showing an example of a pin fixing method.
4A and 4B show a sample soil sampling method according to the present invention, wherein FIG. 4A is a side view / horizontal sectional view of an inner long member, and FIG. 4B is a side view / horizontal sectional view of an outer elongated member. (C) is a side view / horizontal sectional view when penetrating, (d) is a side view / horizontal sectional view when pulling up, (e) is a side view / vertical sectional view when placed horizontally on the ground, These are a side view and a vertical cross-sectional view when the sample is observed horizontally.
FIG. 5 is a third embodiment of the sample soil collecting apparatus according to the present invention, where (a) is a vertical sectional view / horizontal sectional view of an inner long member, and (b) is a side view / horizontal of an outer elongated member. Sectional view, (c) is a side view / horizontal sectional view at the time of penetration, (d) is a side view / horizontal sectional view at the time of pulling up, and (e) is a horizontal sectional view of the gripping member portion.
6 is a side view / vertical sectional view showing a sample observation method according to the third embodiment in FIG. 5 in the order of steps;
[Explanation of symbols]
A …… Improved soil
B …… Sample soil
1 …… Sample soil sampling device
2. Inside long member
2a ... Cylindrical member
3. Outer long member
3a ... Cylindrical member
4. Open section long sampling member
5 ... Closed section long sampling member
6 …… Hug member
7 …… Flange
8 …… Bolt
9 …… Hug member
10 …… Flange joint
11 …… Connection shaft
12 …… Rotation drive shaft
13 …… Locking ring
14 …… Pin
14a ... Male thread
15 …… Pin groove
16 …… Set screw
20 …… Solidifying material liquid injection pipe
21 …… Flexible hose
30 …… Bottom lid
31 …… Supporting member
32 …… Rotation lever
40 …… Cover member
50 …… The cradle
51 …… Scoop

Claims (4)

When inserted into the improved ground immediately after the completion of construction in an open cross-sectional state in a plan view substantially C-shaped with two side members opened by overlapping two long members having a substantially semicircular cross-sectional shape, and reaching a predetermined depth, Rotating the other long member around the central axis with respect to one long member to form a long sampling member with a closed cross section, and pulling the long sampling member to the ground Method.   The sample soil sampling method according to claim 1, wherein the long sampling member is pulled up while discharging the solidified material liquid from the tip of the long sampling member. It is composed of two long members that can be overlapped in a semicircular cross-sectional shape, one long member is provided to be rotatable around the central axis, and the other long member is one long A sample characterized in that it can be a long sampling member having a substantially C-shape in a plan view with a side surface opened, which can be moved integrally with the member in the direction of the central axis and relatively rotatable about the central axis. Soil collection device.   The sample soil collecting apparatus according to claim 3, wherein an injection tube is disposed along the long member.

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