JP2513384Y2 - Sample soil sampling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for collecting a sample soil at a predetermined depth of an improved pillar formed by ground improvement work.

[Prior Art] Generally, ground improvement work using cement-based solidifying material is performed as follows. Fig. 6 shows a ground improvement machine used for the construction work. 1 is a base machine, 2 is an auger motor, 3 is an excavating shaft capable of rotating and feeding, and a stirring device 4 is attached to the tip of the excavating shaft. is there. This stirring device 4 has an excavation blade 6 attached to the tip of a rod 5 and a plurality of stages of stirring blades 7 attached above it. A discharge port (not shown) for solidifying material is provided at the tip of the rod 5.

Therefore, first, the excavation shaft 3 and the rod 5 are rotationally advanced to advance to a predetermined hollow depth, and then excavated while discharging the solidified material to perform mixing and stirring. When the injection digging process is completed to the predetermined depth in this way, the discharge of the solidified material is stopped and the digging shaft 3
And the rod 5 is pulled up while reversing the rotation direction, and mixed and stirred. This forms an improved column of soil cement.

However, in order to take a sample of the specified depth for performing the compression test of this improved column, it is conventionally necessary to use a separate boring machine before the 28th day before the compression test. Was sampled and the 28-day strength was measured.

[Problems to be Solved by the Invention] However, there are the following problems in the sampling by the boring.

Since it is necessary to separately perform core boring using a boring machine, it takes time and effort to collect a sample.

Since the core boring can be done only after the improved column has solidified, early strength check cannot be performed.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a sample soil sampling apparatus capable of sampling an unsolidified sample soil of a required depth before the constructed improved pillar is solidified. To do.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a sample soil sampling apparatus of the present invention comprises a connecting shaft connected to an excavating shaft of an excavating device, and a fixing shaft fixed to the lower end of the connecting shaft and excavating at the tip. A cylindrical body having a bit and having an opening provided on a peripheral wall thereof, wherein a door having a pressure receiving plate protruding from an outer surface is attached to the opening so as to be opened and closed by a hinge.

Further, in the sample soil sampling apparatus of the present invention, an upper flange and a lower flange are provided at a fixed interval at a lower end of a connecting shaft that is connected to an excavating shaft of an excavating device, and an opening is provided on a peripheral wall surface. The inner pipe is fixed to the inner wall, an opening is provided on the peripheral wall surface, a soil receiving plate is provided on one edge of the opening, and an outer pipe having at least one pair of resistance plates protruding from the outer peripheral wall is the inner pipe. The upper and lower flanges of the inner pipe are rotatably fitted to each other within a certain range, and between the upper flange of the inner pipe and the upper end of the outer pipe, the openings of the inner pipe and the outer pipe are aligned by positive rotation of the inner pipe. A stop member is provided, and a restriction member is provided that stops by closing the opening of the inner pipe with the outer pipe when the inner pipe rotates in the opposite direction, and a drill bit is fixedly provided at the lower end of the inner pipe. To do.

[Operation] In the invention of the first claim, earth pressure is applied to the pressure receiving plate during the excavation, and the excavation shaft is rotated in the direction in which the door is closed.

By rotating the excavation shaft in the opposite direction at the time of sampling, the pressure receiving plate receives earth pressure in the direction in which the door opens, so that the door opens and the sample soil enters the cylinder.

In the invention of the second aspect, when the excavating shaft is rotated, the inner pipe is rotated, but the outer pipe rotatably fitted on the inner pipe has the restricting members mutually due to the resistance of the soil acting on the resistance plate. It does not rotate until it abuts.

Therefore, when the excavation shaft is rotated in the direction in which the opening of the inner pipe is closed by the outer pipe during excavation, the inner pipe rotates with respect to the outer pipe, and the opening of the inner pipe is restricted at the position closed by the outer pipe. The members abut each other, and the inner and outer tubes rotate together in that state.

Also, when the excavation shaft is rotated in the direction opposite to the direction of excavation during sampling, the inner pipe rotates in the direction opposite to the direction of excavation with respect to the outer pipe, and the regulating member is placed at the position where the openings of the inner and outer pipes are aligned. Contact each other and rotate in this state, so that the sample soil enters the inner tube.

[Embodiment] An embodiment of the first aspect of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of the sampling device 10. The sampling device 10 is attached to the tip of the excavating shaft 3 of the excavating device, for example, the ground improvement machine shown in FIG. 6 instead of the stirring device 4. , A connecting shaft 11 with the excavating shaft 3, a cylindrical body 12 fixed to the lower part thereof, and an excavating bit 13 fixed to the tip of the cylindrical body 12.
It consists of and. An opening 14 is provided on the peripheral wall of the cylindrical body 12, and a door 16 is attached to the opening 14 via a hinge 15 so as to be openable and closable. Reference numeral 17 is a pressure receiving plate provided on the outer surface of the front end portion of the door 16, and reference numeral 18 is an air vent hole provided in the connecting shaft 11.

Therefore, to explain the operation of the sampling device 10, first, the connecting shaft 11 is connected to the excavating shaft of a predetermined excavating device, and while rotating counterclockwise as shown by the arrow in FIG. Immediately before or to the sampling depth of. In this case, since the pressure receiving plate 17 receives a force in the clockwise direction due to the earth pressure, the door 16 is closed.

Next, the rotation of the excavation shaft is stopped, and when stopped immediately before the sampling depth, the sampling device 10 is pushed to the sampling depth and rotated clockwise as indicated by the arrow in FIG. 2b. As a result, the pressure receiving plate 17 receives counterclockwise earth pressure, so that the door 16 is hinged.
Rotate in the same direction with 15 as a fulcrum to open. Therefore, the sample soil enters the cylindrical body 12 from the opening 14 along the inner surface of the door 16 and is collected.

Then, the excavation shaft is rotated again in the counterclockwise direction as shown in Fig. 2a and the sampling device 10 is pulled up while rotating the door 16 in the same direction while keeping the door 16 closed by earth pressure, and the door 16 is opened on the ground to open the sample soil. Take out.

Next, an embodiment of the second aspect of the present invention will be described. FIG. 3 shows the sampling device 20 of this embodiment,
A drilling device, for example, a connecting shaft 21 connected to the tip of the drilling shaft 3 of the ground improvement machine shown in FIG. 6, and an inner pipe 22 fixed to the lower part thereof and having an upper flange 23 and a lower flange 24.
An outer pipe 25 rotatably fitted between upper and lower flanges 23, 24 of the inner pipe 22 within a certain range, and a drill bit 26 fixed to the lower end of the inner pipe 22.

An opening 27 is formed in the peripheral wall of the inner pipe 22, and a pair of stoppers 28 and 29, which are restricting members, project from the lower surface of the upper flange 23 as shown in FIGS. 4a and 4b. There is. An opening 30 is also formed on the peripheral wall of the outer tube 25,
A soil receiving plate 31 is provided on one end of the opening 30 so as to project outward. Further, as shown in FIGS. 4a and 4b, an arcuate convex portion 32 as a regulating member is formed on the upper edge of the outer pipe 25, and a pair of resistance plates 33, 33 are attached to the peripheral wall of the outer pipe 25. Has been.

Therefore, to explain the operation of this sampling device 20, first, the connecting shaft 21 is connected to the excavating shaft of the excavating device, and the excavation is advanced to a predetermined depth of the improved column while rotating clockwise as shown in FIGS. 4a and 5a. . In this case, one stopper 29 of the upper flange 23 of the inner pipe 22 abuts the arcuate convex portion 32 of the outer pipe, so that the inner pipe 22
The opening 27 of the outer tube and the opening 30 of the outer tube are closed at positions that do not match as shown in FIG. 5a.

Next, when the excavation shaft is rotated in the opposite direction (counterclockwise), only the inner pipe 22 rotates initially and the outer pipe 25 hardly rotates due to the action of the resistance plate 33. Therefore, as shown in FIG. The other stopper 28 comes into contact with the arcuate convex portion 32, and thereafter the outer pipe 25 also rotates together with the inner pipe 22. In this state
As shown in Fig. 5b, since the positions of the openings 27 and 30 of the inner pipe 22 and the outer pipe 25 match, the sample soil hits the soil receiving plate 31 and the openings 2
Collected from 7,30 in the inner tube 22.

Next, by rotating the excavation shaft clockwise again, the openings 27 and 30 are closed as shown in FIG. 5a, the sampling device 20 is pulled up, and the sample soil is taken out on the ground.

[Effects of the Invention] According to the present invention described above, the following effects are achieved.

Since it is not necessary to perform core boring using a separate boring machine, it is possible to easily collect the sample soil at the required depth.

Since unsolidified sample soil can be collected immediately after construction, early strength check and countermeasures can be taken.

Not only improved soil, but also samples for ordinary soil tests can be easily collected.

In the device according to the first aspect, since the opening and closing of the opening is performed by the door, when the opening is opened, the door serves as a guide for digging in the sample soil, and the sample can be swiftly and reliably collected.

In the device according to the second aspect, since the resistance plate is provided, the opening can be opened and closed surely.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the first aspect of the present invention, and FIGS. 2a and 2b are the first and second views showing the operation thereof, respectively.
FIG. 3 is a horizontal sectional view taken along the line II-II of FIG. 3, FIG. 3 is a perspective view showing an embodiment of the second aspect of the present invention, and FIGS.
Figures 5a and 5b show the operation of IV-IV in Figure 3, respectively.
Line and VV line horizontal sectional view, FIG. 6 is a side view showing an example of a ground improvement machine. 1 ... Base machine, 2 ... Auger motor, 3 ... Drilling shaft, 10,20 ... Sampling device, 11,21 ... Connecting shaft, 12 ... Cylindrical body, 13,26 ... Drilling bit, 14 ... Opening part, 15 …… Hinge part, 16 …… Door, 17 …… Pressure plate, 22 …… Inner tube, 25 …… Outer tube, 27,30 …… Opening part, 28,29 …… Stopper (regulating member) , 31 …… earth support plate, 32 …… arc-shaped convex part (regulating member), 33
...... Resistor plate.

Claims (2)

(57) [Scope of utility model registration request] 1. A connecting shaft connected to an excavating shaft of an excavating device,
The connecting shaft is fixed to the lower end, has a drill bit at the tip, and has a cylindrical body with an opening provided in the peripheral wall. A door having a pressure receiving plate protruding on the outer surface is opened and closed by a hinge in the opening. A sample soil sampling device characterized by being installed as much as possible. 2. An upper pipe and a lower flange are provided at a lower end of a connecting shaft that is connected to an excavating shaft of an excavating device at regular intervals, and an inner pipe having an opening on a peripheral wall surface is fixed to the peripheral pipe. An outer pipe having an opening provided on the wall surface, a soil receiving plate provided at one end edge of the opening, and at least one pair of resistance plates projecting from the outer peripheral wall has a fixed range between the upper and lower flanges of the inner pipe. The outer pipe is rotatably fitted inside, and between the upper flange of the inner pipe and the upper end of the outer pipe, the openings of the inner pipe and the outer pipe are aligned and stopped by the forward rotation of the inner pipe. A device for collecting sample soil, characterized in that a regulating member is provided to stop the opening of the inner pipe blocked by the outer pipe when rotated in the opposite direction, and an excavating bit is fixedly provided at the lower end of the inner pipe.