JP2002061162A - Soil sampling method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely sample an improved soil at a predetermined position as it remains intact without being compressed, even if highly viscose, during sampling the soil in an improved ground, and to quickly sample the improved soil in the state of being not solidified right after constructed by using a device having a relatively simple structure. SOLUTION: An open sectionally-long sampling member 4 in an approximately semicircular shape in cross section formed with two long materials 2, 3 in an approximately semicircular shape in cross section laid on each other is inserted into the improved ground right after constructed. When it arrives at a predetermined depth one long member 2 is rotated about a center axis with the other long member 3 to form a closed sectionally-long sampling member 5 in an approximately circular in cross section. A sound cylindrical sampled soil is taken in order by sideway cutting using the long member 2 and the long sampling member 45 is pulled up on the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for collecting a sample soil, for example, by inserting it into an improved ground (soil cement body) immediately after construction, and to a sample soil collecting apparatus used in the method. is there.

[0002]

2. Description of the Related Art In a soil improvement method for constructing a soil cement body by stirring and mixing a site soil and a cement-based solidifying material liquid, it is necessary to collect a sample soil for quality control of the constructed soil cement body. In the past, conventionally, immediately after construction of the ground improvement, a vinyl chloride pipe was inserted into the improved ground to a predetermined depth, and before the soil cement body was completely hardened, the vinyl chloride pipe was pulled up. A sample soil was being collected. There is also a method of collecting the soil cement body by core boring after it has completely hardened.

[0003]

However, in the case of a conventional apparatus for collecting a closed section such as a vinyl chloride pipe, the so-called blocking effect in which the inner peripheral surface friction acts due to the high adhesive force of the soil cement when the pipe is pushed in. As a result, there are problems that the sample soil cannot be collected or that the sample soil is compressed to change its properties.

In the case of a vinyl chloride pipe or the like, the pipe is inserted immediately after the construction and the pipe is pulled up after the soil cement body is hardened. In the case of core boring, the improved soil after the hardening is collected is collected. In addition to quality control, there are problems such as time and cost.

[0005] For this reason, it is conceivable to use the method for collecting earth and sand disclosed in Japanese Patent Application Laid-Open No. 10-147928. In this case, the sample soil collecting method is to insert a long sampling member having a substantially U-shape having an open cross section having an open side surface into the improved ground immediately after construction, and when a predetermined depth is reached, the ground surface is placed on the open side surface. A side member is inserted into the improved ground from the side, and the sample soil is removed by this side member into the surrounding improved soil
The long sampling member filled with the sample soil is pulled up to the ground.

However, even in such a method, in the case of a highly viscous soil cement, the soil cement to be collected is 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. was there.

Further, Japanese Patent Application Laid-Open No. 2000-1844 discloses a sample soil collecting apparatus in which an opening is formed by notching a side wall in a longitudinal direction of a cylindrical body while leaving a part of the side wall of a hollow cylindrical body. ing. In this sample soil sampling device, a hollow cylindrical body is erected in the improved ground and then rotated to cut off the sample soil at the opening and the surrounding improved soil to collect the sample soil. is there. Since this sample soil collecting device uses only a hollow cylinder, if the opening angle of the opening is increased, the adhesive force enough to hold the sample soil in the hollow cylinder is lost, and the sample soil falls. And the aperture angle must be around 120 degrees.

However, in this device, in which the opening angle of the opening is considerably smaller than 180 degrees, the peripheral surface of the side wall of the cylindrical portion is considerably large, approximately 240 degrees. The improved soil (soil cement) to be collected may be compressed in the depth direction due to friction between the surface and the improved soil (soil cement).

Also, since the opening is constantly open,
When the hollow cylinder is collected on the ground, the surrounding soil (soil cement) and the sample soil are constantly pulled up while rubbing in the improved body (soil cement), and the peripheral surface of the sample soil is affected. In addition to the danger, when the device comes out of the ground from the improved body (soil cement), there is a danger that the sample soil may fall off from the opening that has become vertical and has come out to the ground.

The present invention has been made in order to solve such a problem, and an object of the present invention is to easily improve an improved soil having a high viscosity without compressing the improved soil at a predetermined position. It is an object of the present invention to provide a method and an apparatus for collecting soil sample which can be reliably collected and which can promptly collect improved soil that has not yet been solidified immediately after construction with a device having a relatively simple configuration.

[0011]

According to a first aspect of the present invention, two long members (such as half-split steel pipes) having a substantially semicircular cross section are superimposed on each other and inserted into the improved ground immediately after the completion of the construction. When a predetermined depth is reached, one of the long members is rotated around the central axis to form a long sampling member having a closed cross section (such as a substantially circular cross section). This is a sample soil collecting method characterized by raising a collecting member to the ground.

According to a second aspect of the present invention, in the sample soil collecting method of the first aspect, the long collecting member is pulled up while discharging a solidifying material liquid (such as cement milk) from the tip of the long collecting member. Sample soil sampling method.

According to a third aspect of the present invention, two long members (such as half-split steel pipes) having a substantially semicircular cross-section and being overlapped with each other are provided, and one of the long members is provided around a central axis. A sample soil collecting apparatus, wherein the other long member is provided so as to be integrally movable with the one long member in the central axis direction and relatively rotatable around the central axis. is there. For example, one (inside or outside) long member is connected to the tip of a rotary drive shaft or a rotary drive jig of a ground improvement machine, and the other (outside or inside) long member is connected to one long member. Is connected to the upper part by an engaging mechanism such as a pin groove.

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 pipe is provided along the long member. The injection tube may be provided on the outer surface of the outer elongated member, or may be provided on the inner surface of the inner elongated member. In short, it is only necessary that there is a thin injection pipe extending from the ground surface side to the lower side of the long member.

It is preferable that a bottom cover be provided on the lower surface of the long member so as to be opened when inserted into the improved ground and closed when pulled up. This bottom lid can be rotated horizontally or vertically by operation from the ground, for example, via a rotating lever, so that the bottom surface of the long sampling member can be closed, or when inserted, it rises due to the resistance of the soil and automatically rises. The door should be closed horizontally by the earth pressure when it is pulled up.

[0016] In the above-described configuration, the conventional closed cross-section is inserted in the improved ground immediately after the construction, in which a long sampling member having an open cross-section in which two substantially semi-circular long members are overlapped is inserted. There is no blockage effect due to friction of the inner peripheral surface like a pipe,
The sample soil smoothly enters the sampling space of the long sampling member, and a continuous uncompressed sample soil is obtained.

When a predetermined depth is reached, one of the long members is rotated, and this long member becomes a cover member for covering the opening of the other long member. A columnar sample soil is formed. By cutting off 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 falling off.

In the case of an improved soil having a high viscosity, at the time of insertion, the sample soil on one side is compressed by friction by a long sampling member having a substantially semicircular cross section at the time of insertion, similarly to the conventional long sampling member having an open section made of H-section steel or the like. Although the sample soil may be disturbed, the sample soil on the other side is taken in by cutting the long member from the lateral direction, so that a sound sample soil without disturbance is obtained.

When the sample soil sampling device is pulled up, the cement-based solidifying material liquid is discharged using an injection pipe, and the space in which the sample soil has been collected is filled with the cement-based solidifying material, thereby increasing the strength of the soil cement. It is prevented from lowering.

Injecting the cement-based solidifying material liquid below the sample soil collecting device using the injection pipe in this manner is not limited to merely filling the space. Is in a vacuum state, so-called suction acts to make it difficult to pull up,
Since the collected sample soil may be pulled downward,
It is also to prevent it.

Accordingly, air may be supplied instead of the cement-based solidifying material liquid in order to avoid such a vacuum state below. In this case, the space in which the sample soil is collected may be left as it is, or this space may be filled later by a separately prepared injection pipe for cement-based solidifying material liquid. However, as described above, it is preferable to discharge the cement-based solidifying material liquid when pulling up the sample soil collecting device.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 shows an example of a 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 collecting method of the present invention. FIG. 5 shows a third embodiment. FIG. 6 shows a sample observation method according to the third embodiment.

In FIG. 1, a sample soil collecting apparatus 1 is mainly disposed outside with a long member 2 having a semicircular cross section obtained by halving a steel pipe and disposed inside and a similar shape. The inner elongate member 2 is constituted by an elongate member 3 so that the inner elongate member 2 can be rotated around its central axis by an appropriate operating means.

As shown in FIG. 1 (i), the inner elongate member 2 and the outer elongate member 3 can be overlapped with slightly different diameters so that the directions of curvature can be matched and the side surfaces can be inserted at the time of insertion. Can be an open section long sampling member 4 having a substantially C-shape in plan view with an opening. By inserting such an open section long sampling member 4 into the improved soil A, there is no obstruction effect due to inner peripheral surface friction as in a conventional closed section pipe,
The sample soil smoothly enters the sampling space of the long sampling member, and it is possible to obtain a continuous sample soil that is not compressed.

When inserted to a predetermined depth, FIG. 1 (ii)
By rotating the inner elongated member 2 as shown in FIG. 1, the inner elongated member 2 slides along the inner surface of the outer elongated member 3, and as shown in FIG. Is a lid member that covers the opening of the outer long member 3, the closed-section long collecting member 5 having a substantially circular shape in plan view is formed, and the columnar sample soil B 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 falling off.

In the case of an improved soil having high viscosity, at the time of insertion, as in the case of the conventional open section long sampling member made of H-section steel or the like, as shown in FIG.
Although Sample soil B ₁ of the outer elongated member 3 side (iii) (left) is likely to be disturbed by the compression due to friction, the sample soil FIG inner elongate member 2 side (iii) (right) B _2, because the captured by cut from the lateral direction of the inner elongated member 2, undisturbed sound sample soil is obtained.

FIG. 1 shows the case where the inner elongated member 2 is rotated. However, the present invention is not limited to this, and the same operation and effect can be obtained by rotating the outer elongated member 3. That is, since the sample soil on the long member side on the rotated side is taken in by cutting in the lateral direction due to the rotation, a sound sample soil without disturbance is obtained.

In the first embodiment of FIG. 2, FIG.
As shown in FIG. 2, a cylindrical member 2a made of a circular steel pipe is integrally provided on an upper part of an inner long member 2 made of a semicircular steel pipe, and a connection shaft (square axis) is provided on an upper part of the cylindrical member 2a via a flange joint 10. 11 are connected. By connecting the lower end of the rotary drive shaft 12 of the ground improvement machine to the connection shaft 11, the sample soil sampling device 1 can be inserted into the improved ground as shown in FIG. The member 2 can be rotated around a central axis. However, the present invention is not limited to this, and the sample soil collecting device 1 can be pushed into the improved ground using a backhoe, a vibratory hammer, or the like, and the inner elongated member 2 can be rotated with a handle or the like. However, in the case of a long object that is difficult to rotate by hand or a large cross-sectional diameter, as described above, the upper part should be a square axis connection shaft that can be connected to the rotation drive shaft of the ground improvement machine, and mechanically rotated. Is preferred.

The outer long member 3 made of a semicircular steel pipe is shown in FIG.
(b) As shown in FIG.
a is provided integrally, and the cylindrical member 3a of the outer long member 3 is provided.
Is inserted from the lower side of the inner elongated member 2 with the pin 14 removed, and the pin 14 is attached to the cylindrical member 2 a of the inner elongated member 2 through the pin groove 15 of the outer elongated member 3, and the cylindrical member 2 a
As shown in FIG. 2 (c), the upward movement of the outer long member 3 is prevented by the locking ring 13 provided on the first member, and the cylindrical member 2a and the cylindrical member 3a are connected by the pin 14 and the pin groove 15. The inner elongate member 2 and the outer elongate member 3 are integrated with respect to the central axis direction, and are relatively rotatable around the central axis.

The pin 14 is the cylindrical member 2 of the inner long member 2.
a (see FIG. 3 (d), which will be described in detail later), and the pin groove 15 is formed in the cylindrical member 3a of the outer long member 3 horizontally over 180 ° or more (FIG. 2).
(See (e)). At the time of assembling and inserting the sample soil collecting apparatus, the inner elongated member 2 and the outer elongated member 3 are integrated in the central axis direction by locking the locking ring 13 and the pin 14 with the pin groove 15, and the pin 14 is rotated during rotation. By moving in the pin groove 15, the inner elongated member 2 can be rotated by 180 ° with respect to the outer elongated member 3 fixed by the circumferential friction with the improved soil.

On the outer surface of the outer elongated member 3, an injection pipe 20 for cement-based solidifying material liquid is provided.
Is provided with a bottom cover 30 for closing the bottom surface after collecting the sample soil.

The solidifying material liquid injection pipe 20 is attached so that the nozzle at the lower end thereof slightly protrudes from the lower end of the outer long member 3, and discharges the cement-based solidifying material liquid when pulling up the sample soil collecting device. The space in which the sample soil was collected is filled with a cement-based solidifying material to prevent the strength of the soil cement from decreasing. The solidified material liquid is the rotary drive shaft 1 of the ground improvement machine.
2, the connecting shaft 11 and the inside of the cylindrical member 2a of the inner elongated member 2, so that the upper part of the solidified material liquid injection pipe 20 and the discharge port of the cylindrical member 2a are connected by a flexible hose 21 and the inner Even when the measuring member 2 and the like rotate, the solidifying material liquid can be supplied.

Injecting the cement-based solidifying material liquid below the sample soil collecting device by using the solidifying material liquid injection pipe 20 in this manner is not limited to merely filling the space, but pulling up the sample soil collecting device. In addition, since the lower portion is in a vacuum state, it is difficult not only to pull up, but also there is a possibility that the collected sample soil may be pulled downward. Inject the cement-based solidifying material liquid below.

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 in which the sample soil is collected may be left as it is, or this space may be filled later by a separately prepared injection pipe for cement-based solidifying material liquid. However, as described above, it is preferable to discharge the cement-based solidifying material liquid when pulling up the sample soil collecting device.

As shown in the bottom view of FIG. 2A and FIG. 2D, the bottom cover 30 has a plane shape capable of covering at least a semicircular cross section of the inner long member 2. It is attached to the lower end of the inner elongated member 2 by screws or the like so as to be rotatable in the vertical direction. Therefore, when inserting the soil sampling device,
As shown in FIGS. 2 (c) and (f), the soil rises vertically due to the resistance of the soil and does not disturb the sample soil.
As shown in (d) and (f), the bed is horizontally laid by the earth pressure, and the sample soil can be prevented from falling. Note that a support member 31 for holding the bottom cover 30 in a horizontal state is provided.
Is attached to the inner surface of the lower end of the inner elongated member 2 (FIG. 2).
(f)).

The bottom cover is not limited to the automatic vertical rotation type described above, but may be a horizontal rotation type bottom cover 30 as shown in FIG. 2 (g). The bottom cover 30 can be rotated and opened by a rotation lever 32 by an operation from the ground. The rotary lever 32 is composed of 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, and the rotary bottom cover 30 is horizontally fixed to the lower end of the bar 32a. I 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).
By rotating a by 180 °, the lower surfaces of the long members 2 and 3 at the time of lifting are covered. Also, not limited to this,
The bottom cover 30 may be opened and closed in the vertical direction by the operation lever.

In the second embodiment shown in FIG. 3, the cylindrical member 3a of the outer long member 3 to which the solidifying material liquid injection pipe 20 is mounted is attached to the connection shaft 11 via the flange joint 10, and the outer long member 3 is attached. It is configured to rotate. in this case,
The upper end of the solidified material liquid injection pipe 20 can be directly connected to the cylindrical member 3a, and the flexible hose 21 can be omitted.

The configuration of the inner elongated member 2 in this case is similar to the configuration of the first embodiment, and the inner elongated member 2 is mounted on the lower side of the outer elongated member 3 with the pin 14 removed. And the pin 14 is attached to the cylindrical member 2a of the inner elongated member 2 through the pin groove 15 of the outer elongated member 3, and the cylindrical member 2a and the cylindrical member 3a are connected by the pin 14 and the pin groove 15. The elongate member 2 and the outer elongate member 3 are integrated with respect to the central axis direction, and are relatively rotatable around the central axis. The pin 14 is detachably attached to the cylindrical member 2a of the inner long member 2 by a screw as shown in FIG. 3 (d). That is, the male screw 14a is integrally formed on the tip end side of the pin 14, and 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.

A cover member 40 is provided at the lower end of the inner elongated member 2 to cover the discharge port of the solidified material liquid injection pipe 20, and when the sample soil collecting device is inserted, the discharge port of the solidified material liquid injection pipe 20 is used for improving soil. Prevents blockage due to intrusion. At the time of lifting,
As shown in the side view of FIG. 3B and the bottom view shown below, the rotation of the outer long member 3 causes the discharge port of the solidified material liquid injection pipe 20 to be disengaged from the fixed lid member 40, and the solidified material liquid Can be discharged.

The lid member 40 can be applied to the first embodiment shown in FIG. Further, in the first and second embodiments, as shown in FIG. 3 (c), the nozzle of the solidifying material liquid injection pipe 20 can be directed sideways to prevent the infiltration of the improved soil. In this case, there is no need to attach the lid member 40.

The solidifying material liquid injection pipe 20 may be attached to the inner surface of the inner elongated member (inner pipe) 2 as shown in FIG. In addition, in FIG.
Is protruded from the lower end of the outer elongated member (outer tube) 3 so as to be able to support this protruding portion when placed horizontally on the ground.

Using the sample soil collecting apparatus 1 having the above structure, sample soil is sampled as follows (see FIG. 4).
FIG. 4 shows a type in which the inner elongated member 2 is rotated as in the first embodiment of FIG.

(1) Immediately after the ground improvement work, the sample soil sampling device 1 is connected to the rotary drive shaft of the ground improvement machine and inserted into the improved ground. At this time, as shown in FIG. 4 (c), the inner elongated member (inner tube) 2 and the outer elongated member (outer tube) 3 are overlapped,
As shown in the horizontal cross-sectional view shown by the II-line section below, it is inserted in the state of an open-section long sampling member 4 having a substantially C-shape in plan view. When the bottom cover 30 is of a vertical rotation type, as shown in FIG.
In the case of the horizontal rotation type, as shown in FIG. 2 (g), it is arranged outside the elongated members 2 and 3.

(2) When the sample soil collecting device 1 reaches a predetermined depth, the inner elongated member 2 is rotated by 180 ° to cut off the improved soil on one side surface. As shown in the lower part of FIG. 4 (d), a closed-section long sampling member 5 having a substantially circular shape in a plan view is formed, and a continuous columnar sample soil B is collected without being solidified and compressed.

(3) In the case of the horizontally rotating bottom cover 30, the bottom surfaces of the long members 2 and 3 are closed by rotating horizontally. In the case of the vertical rotation type, the bottom cover 30 is closed by the earth pressure to be in a horizontal state. As shown in FIG. 4 (d), the closed-section long collecting member 5 having a closed bottom and a substantially circular shape in a plan view is pulled up and collected on the ground.

(4) The sample soil sampling device 1 is detached from the rotary drive shaft of the ground improvement machine, and as shown in FIG. 4 (f), the undisturbed sample soil can be observed or the undisturbed sample soil can be observed. In order to obtain the specimen from the soil, it is laid horizontally on the ground with the member on the rotated side down, ie in the case described above, with the inner elongated member 2 down. The distal end protruding portion of the inner elongated member 2 is supported by a pedestal 50 such as a tree.

(5) As shown in FIG. 4 (g), the outer elongate member 3 covering the inner elongate member 2 is rotated by 180 ° to observe the sample soil, and if necessary, the upper part is scooped up with a scoop or the like. Remove the sample soil and observe the undisturbed lower sample soil. If necessary, perform block sampling or manufacture a specimen for strength confirmation.

Next, a third embodiment shown in FIG. 5 will be described. In the third embodiment, the inner elongated member 2 is rotated as in the first embodiment, but the outer elongated member (outer tube) 3 is moved relative to the inner elongated member (inner tube) 2. It can be easily removed from the side. That is, a pair of upper and lower holding members 6 made of a short semicircular steel pipe are provided above 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, the inner elongated member 2
And a cylindrical member 3a 'that can be attached to the cylindrical member 2a from the side.

The holding member 6 and the outer long member 3 are
As shown in (e), the flange 7 and the bolt 8 are detachably fastened. The pin groove 15 is formed by disposing 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 is less bent than the case where the pin groove (notch) 15 is located below as in the first embodiment of FIG. Strength can be increased. Further, when assembling the device or disassembling the device as shown in FIG. 6 (ii), the attachment and detachment of the inner elongated member 2 and the outer elongated member 3 are facilitated. Further, a holding member 9 made of a semicircular steel pipe is removably attached to the lower part of the outer long member 3 with a bolt 8 in the same manner as the holding member 6, and is reinforced. The holding member 9 also serves as a rotation guide for the inner elongated member 2, and the inner elongated member 2 rotates smoothly.

The inner long member 2 is the same as that of the first embodiment shown in FIG. 2, and the sampling of the sample soil is performed in the above-described procedure.
At the time of observation of the sample, the following procedure is performed (see FIG. 6).

(1) Place the inner elongated member 2 horizontally on the ground with the inner elongated member 2 facing down. The tip of the inner elongated member 2 is connected to a pedestal 50 such as a tree.
Support with.

(2) The bolt 8 of the outer long member 3 is removed, and the outer long member 3 is lifted and removed from the inner long member 2 to expose the sample soil B.

[0053] (3) Sample soil B is a sample soil B ₁ of the upper portion of the outer elongate member 3 side that may be present in the disturbance, is undisturbed bottom of the inner elongated member 2 side sound sample a soil B ₂ (see FIG. 1), removal of the sample soil B ₁ of the upper shovel 51 or the like, to expose the healthy observation surface of the sample soil B ₂ of the lower, monitored, for measurements such as compressive strength The specimen is prepared.

The structure using the holding members 6, 9 is applicable to the outer long member 3 even when the outer long member 3 rotates as in the second embodiment of FIG. Can be. In the third embodiment shown in FIG. 5, the pin 14 does not need to be detachable, but can be fixed to the cylindrical member 2a of the inner long member 2.

[0055]

Since the present invention has the above-described configuration, the following effects can be obtained.

(1) To insert a long sampling member having an open cross section obtained by stacking two long members having a substantially semicircular cross section into the improved ground immediately after construction, such as a conventional pipe having a closed cross section, There is no blocking effect due to the friction of the inner peripheral surface, the sample soil smoothly enters the collection space of the long collection member, and a continuous non-compressed sample soil can be obtained.

(2) When a predetermined depth is reached, the sample soil can be cut off from the surrounding improved soil by rotating one long member and closing the side opening of the other long member. The unsolidified sample soil immediately after can be reliably and quickly collected without falling off, and quality control of the ground improvement body immediately after construction can be performed.

(3) In the case of improved soil having high viscosity, even if the sample soil on one side is disturbed by friction due to the long sampling member having a substantially semicircular cross section, the sample soil on the other side is long. Since it is taken in by cutting the member from the lateral direction, a sound sample soil without disturbance is obtained, and accurate sample observation, strength test, and the like can be performed.

(4) Sampling can be easily and quickly performed with a device having a relatively simple configuration, and cost can be reduced.

(5) By discharging the cement-based solidifying material liquid at the time of lifting, the space in which the sample soil has been collected can be filled with the cement-based solidifying material, and a decrease in the strength of soil cement can be prevented. . In addition, since the vacuum state at the time of pulling can be eliminated by injecting the solidifying material liquid, air, or the like, the pulling can be easily performed and the drop of the sample soil can be prevented.

(6) If the holding member made of a semicircular steel tube or the like is detachably attached to the outer long member, the attachment and detachment of the inner long member and the outer long member are facilitated.

[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 long member,
(b) is a side / bottom view of the outer long member, (c) is a side / bottom view when penetrating, (d) is a side / bottom view when pulled up, (e)
FIG. 7 is a horizontal sectional view of the upper part of the elongated member, (f) is a vertical sectional view of the lower end of the elongated member, and (g) is a perspective view showing another example of the bottom cover.

FIG. 3 is a second embodiment of the sample soil collecting apparatus according to the present invention, in which (a) is a side view and a bottom view at the time of penetration, (b) is a side view and a bottom view at the time of pulling up, and (c). FIG. 9 is a cross-sectional view showing a modified example of the solidifying material liquid injection pipe, and FIG. 9D is a cross-sectional view showing one example of a pin fixing method.

4A and 4B show a sample soil collecting method according to the present invention, wherein FIG. 4A is a side view and a horizontal cross-sectional view of an inner long member, and FIG. 4B is a side view and a horizontal cross-sectional view of an outer long member. , (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, (e) is a side view / vertical sectional view at the time of horizontal collection at the ground,
(f) is a side view and a vertical cross-sectional view when the sample is placed horizontally.

FIG. 5 is a third embodiment of the sample soil collecting apparatus according to the present invention, in which (a) is a vertical sectional view / horizontal sectional view of an inner long member,
(b) is a side view / horizontal cross section of the outer long member, (c) is a side view / horizontal cross section when penetrating, (d) is a side view / horizontal cross section when pulling up, and (e) is a grip. It is a horizontal sectional view of a member part.

6A and 6B are a side view and a vertical sectional view showing a sample observation method according to the third embodiment of FIG. 5 in the order of steps.

[Description of Signs] A: Improved soil B: Sample soil 1: Sample soil sampling device 2: Inside long member 2a: Cylindrical member 3: Outside long member 3a: Cylindrical member 4: Open section length Length sampling member 5: Closed section long sampling member 6: Holding member 7: Flange 8: Bolt 9: Holding member 10: Flange joint 11: Connection shaft 12: Rotating drive shaft 13 ... Locking ring 14 Pin 14a Male screw 15 Pin groove 16 Set screw 20 Solidified material liquid injection pipe 21 Flexible hose 30 Bottom lid 31 Support member 32 Rotating lever 40 …… Lid member 50 …… Cradle 51 …… Scoop

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshiaki Yamane 6-13-7 Akasaka, Minato-ku, Tokyo F-term in Tenox Co., Ltd. (reference) 2D043 AC05 BA08 BB09

Claims (4)

[Claims] 1. A method in which two long members having a substantially semicircular cross section are superimposed on each other and inserted into the improved ground immediately after the completion of the construction. A method for collecting a sample soil, comprising: rotating a long member around a central axis to form a long sampling member having a closed cross section; and lifting the long sampling member to the ground. 2. The method according to claim 1, wherein the long collecting member is pulled up while discharging the solidifying material liquid from the tip of the long collecting member. 3. An elongate member comprising two elongate members which are substantially semicircular in cross section and can be overlapped, one of which is rotatably provided around a central axis, and the other elongate member. Is provided on one of the long members so as to be integrally movable in a central axis direction and relatively rotatable around the central axis. 4. The sample soil collecting apparatus according to claim 3, wherein an injection pipe is provided along the long member.