JPS60185133A - Method and apparatus for collecting undisturbed sample - Google Patents

Abstract

PURPOSE:To collect a sample efficiently in the undisturbed state and to perform a CBR test under the intact collected state, by replacing a core tube, which is used to dig a hole in the earth, with a sampler, whose diameter is smaller than that of the core tube, and compressing the sampler into a roadbed. CONSTITUTION:A hole is dug by a core tube, which is attached to a boring machine. Thereafter, the coe tube is replaced by a smapler 23, whose diameter is smaller than that of the core tube. The sampler 23 is pushed into a roadbed 4 by hydraulic pressure. The sampler 23 is composed of head 24 at the upper end, couplings 26 and 27, a shoe 30 at the lower end and a sampling liner 28, which is held by collars 29 at the upper and lower parts in the inside of the coupling 27. After the sample is collected, the sampler 23 is disassembled, and the liner 28 and the collars 29 are intactly set in a CBR testing machine. Therefore, the CBR test can be performed without transferring the sample under the undisturbed state and the test is conducted very economically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for collecting an undisturbed sample, and more specifically, a method for collecting an undisturbed sample, which is extremely simple and allows highly efficient sample collection of zero roadbed. and equipment.

In the past, the method shown in Figure 1 was used to sample the existing roadbed in an undisturbed state. That is, what is indicated by reference numeral 1 in Fig. 1 is asphalt concrete (asphalt concrete) that constitutes the entire top layer of the road, and the upper layer 2 and lower layer 3 are constructed below it, and these are formed on the road bed 4. ing.

In order to collect a sample of the subgrade 4 in an undisturbed state on a road having such a paved structure, the following procedure has been used.

Ascon 1 using a movable diamond cutter etc.
For example, the opening 1a is cut to a size of 1 m x
The roadbed was formed into a 1m quadrilateral shape, and then the subgrade was dug by hand.
The excavation was conducted up to the point where the current condition of subgrade 4 was measured ±4a, and all samples for CBB (California Bearing Ratio) testing were collected.

However, when such a method is adopted, the opening Iaffi
It takes a lot of time, manpower, and equipment to dig the chestnuts, which must be formed to a size that can be dug by hand.
It was cheap and extremely uneconomical, and only about 94 pieces could be collected per day.

Furthermore, even if an undisturbed sample is obtained, in order to perform the CBI test, the entire sample must be refilled into a cylinder for testing, which requires extra time and effort, making it extremely economical. The test was conducted under unfavorable conditions.

The present invention has been made in order to improve all the drawbacks of the conventional methods as described above, and it is possible to collect an undisturbed sample in a particularly efficient manner, and also to conduct a CB l (test) in the same state as the sample. An object of the present invention is to provide a method and apparatus for collecting an undisturbed sample, which are configured to enable the collection of undisturbed samples.

In order to achieve all of the above objects, the present invention includes a boring machine installed in a movable vehicle, and utilizes this boring machine to fully rotate the core tube and collect all samples at any location. At the same time, a sump 9- attached to a boring machine was pressed into the roadbed using this drilled hole instead of the core tube, and a sample was collected. A configuration was adopted in which the sampling liner 7il was taken out and the sampling liner was placed together with the sample in the same manner as in the CBB test.

Hereinafter, details of the method and apparatus of the present invention together with the drawings +Y+II
I will explain everything.

Is Fig. 2 an example of a specific device for implementing the method of the present invention? 1, the same parts as in FIG.

The reference numeral 5 in FIG. 2 is a moving vehicle, for example, a 2t rack is selected.A generator I and a water storage tank 8 are mounted on the abutment 6 of the vehicle 5.

On the other hand, a boring machine 9 is mounted at the end of the loading platform 6. This boring machine 9 has a base 10, to which a motor 11 is fixed, and its output is connected to a belt 12 and sent to a transmission 14 on a frame 13 fixed on the base 10. The rotation of the motor 11 is transmitted to the rotating shaft 1 through the
5. How many rotational shafts 15 are outside the extraction force of 6?
11, and is connected to the transmission 141HII through the spindle 16.No. The cylinder numbered 18 is a hydraulic cylinder, which fulfills the role of pressing the rotary shaft 15'x toward the lower blade.

A core tube 19 is connected to the lower end of the rotating shaft 150 . This core tube 19 is formed in a cylindrical shape, and a metal crown 20 for ascon excavation is fixed to the open lower end of the core tube 19. Further, a core lifter 21 is installed in the middle of the core tube 19.

First, the one shown in FIG. 4 is a sampler, and this sampler 23 has a head of 24 feet at the upper end. head 24
A female threaded portion 25 is formed in the center of the rotary shaft 15, and this female threaded portion 25 is screwed onto the lower end of the rotating shaft 15. A coupling 26 is screwed onto the upper end of the outer 111tlK of the lower end of the head 24. coupling 26
The lower end of the coupling 27 is screwed onto the outside of the upper end of another coupling 27 .

This coupling 27 is the coupling 2 located on the upper side.
6 is also thin, and the sampling liner 28 is fitted with collars 29 and 29 which are placed between the upper and lower ends of the liner, making use of the difference in thickness. A seam 30 is layered on the outer side of the lower end of the coupling 27 located in the middle.

Next, the operation of this embodiment configured as described above will be explained.

First, the vehicle 5 is driven and moved to the part of the road where the hole is to be drilled, and is fixed with the full wheel stopper 22.

In the first Jυj, the core tube 19 is fully connected to the rotating shaft 15 located above the ascon 1 work 9, and the motor 1
1 is rotated, and at the same time the cylinder 18 is operated to completely lower the j-tube 19 via the rotating shaft 15. Then, the metal crown 20 is brought into contact with the ascon 1, and the excavation of the ascon 1 is started.

Then, by 1!21 rotation of the metal crown 2U, the aspirator 1 is cut into a disc-shaped aspirator 1b as shown in Fig. 3! ll taken. Since the cut-off ascon 1b is held in the core tube 19 by the core lifter 21, if the cylinder 18 is driven to pull up the core tube 19, it will be pulled up together with the core tube 19.

Therefore, after removing the disc-shaped ascon Ia'z, the VC
As shown in FIG. 3, a circular opening 1c is formed. In this state, the hole is photonized. If you only want to collect ascon, it is best to stop excavation in this state.

On the other hand, when it is desired to sample the subgrade 4, the core tube 19 is further rotated and lowered as shown in FIG. 2
Stop in 0Cb state. If the core tube 19 is pulled up in this state, samples of the ascon 1 and the upper and lower passages Uk 2 +3 are collected.

Incidentally, during the above-mentioned excavation, water is supplied from the water storage tank 8 around the core tube 19, and the excavation is performed while cooling the core tube 19.

Next, a sampler 23 having a diameter one size smaller than that of the core tube 19 is installed in place of the core tube 19, and fitted into the opening 1C. Push in 23. This state is shown in FIG. 6. In FIG. 6, reference numeral 31 indicates a vacuum bottle, which is provided so as to close the constricted portion 15ak of the hollow rotating shaft 115.

Then, at the time of pushing, the subgrade 4 is placed inside the sampler 23.
is pushed in, and the vacuum bottle 31 is pushed upward as the pressure inside the run puller increases. Therefore, samples of the roadbed can be reliably collected.

-73, when pulling up the sampler 23, all A pins 31 fall under their own weight and close the diaphragm 9 part 15a.
The inside of the sunglass 23 is in a vacuum state.

In this way, the force of the hydraulic cylinder of the boring machine 9 can be fully utilized to reliably push the sampler. After the pushing is completely completed, the hydraulic cylinder 18 on the boring machine side is operated to pull up the sampler.

As shown in FIG.
Remove the sampling liner 2 inside the coupling 27.
8 together with the collar 29, and set it in the same state as 1 on the bottom plate 31 of the CBR test machine as shown in FIG.

Then, in this state, attach it together with the bottom plate to the CB It test bloomer and perform a CBR test. In this way, the sample can be completely undisturbed without having to be refilled with CB.
ft test can be performed. Therefore, compared to the conventional method, there is no need for refilling, making it extremely economical.

As is clear from the above description, according to the present invention, a boring machine is installed in a movable vehicle, and after drilling a hole of 91 mm by rotating the core tube fully, the core tube is drilled. Instead, a sampler with an outer diameter smaller than the core tube's outer diameter is attached to the entire area, and the sampler is press-fitted into the roadbed to collect samples, which is extremely efficient and requires a small number of people. All samples can be collected within a short period of time and in completely undisturbed conditions.

In addition, since the sampling liner is removably installed inside the sampler with the upper and lower sides sandwiched by the collar, this sampling liner can be attached to the CB L along with the collar.
It can be installed on the L test machine. Additionally, the entire CB test can be performed with the sample completely undisturbed. Furthermore, efficient CUB tests can be performed without having to refill the sample.

Figure 1 is an explanatory diagram showing the conventional method, Figure 2 and the following diagrams explain one embodiment of the present invention, and Figure 2 is a device to which the present invention is applied. Fig. 3 is an explanatory diagram of the state of drilling, Fig. 4 is a longitudinal cross-section of Rambler 1i111 +ui, Fig. 5
v is 1 1] An explanatory diagram of a hole-like deafness, Fig. 6 is an explanatory diagram of the sampling state, Fig. 7 is an exploded perspective view of the sampler, and Fig. 8 is a perspective view of a sample in poor condition to be hung on a CB test bond. It is a diagram.

1...Ascon 2...Upper roadbed 3...Lower roadbed 4...Roadbed 5...Vehicle 9...Polling manne 15...Rotation +1tlll 18...Hydraulic silling 19...・Core tube 20...Metal crown 23...Sampler 24...Herad
26.2'i'...Coupling 28...Sampling liner 29...Kashi-30 Inventor Masahito Tamagawa Inventor - Hiroya Kawa Figure 4 2I:1 Figure 5 120 Figure 6

Claims (2)

[Claims] (1) Move the entire area of the boring machine onto a movable vehicle,
After drilling a C-hole in the core tube attached to the lower end of the rotating shaft of this boring machine with a removable 5J function,
A method for collecting an undisturbed sample, characterized in that a sampler with a small diameter is used in place of the core tube, and the whole sample is collected by press-fitting this sampler into the roadbed. (2) It consists of a 7m boring machine mounted on a mobile vehicle and a sampler removably attached to the boring machine. The construction is such that the liner and the attached collar can be captured, the sampler can be press-fitted into the roadbed, the sampler can be collected, and the entire sampling liner and collar can be taken out and set in an indoor Cf3B testing machine. An undisturbed sample collection device characterized by: