JPH07180131A - Sampling of improved soil - Google Patents

Abstract

PURPOSE:To sample efficiently an improved soil without mixing samples at each depth of an improved column of a poor subsoil. CONSTITUTION:A sampling rod 1 is forced into an improved column of a poor subsoil, opening sections 4 provided to a rotary hollow pipe 2 at each depth are opened, samples at each depth are respectively taken into the rotary hollow pipe 2 while revolving the sampling rod 1. Bottom plates 5 are respectively provided directly under the opening section 4 into the rotary hollow pipe 2, so that the samples are not mixed with each other. Then, the opening sections 4 are blocked to pull out the sampling rod 1 on the ground, and the opening sections 4 are respectively opened to sample.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sampling improved ground for sampling soft ground improved columns in the depth direction.

[0002]

2. Description of the Related Art Conventionally, in order to confirm the strength of an improved column in which soft ground is improved by mixing and stirring soil cement, uncured samples for each layer are collected. And as this collection method, insert a hollow pipe for each depth of each layer of the improved pillar,
A method for collecting a sample stored in this hollow pipe, or a sample collecting device is attached to a rotating rod, and the lid of the opening provided in the sample collecting device is opened by reversing the rotating rod, and A method is known in which a sample is taken into the sampling device through the opening, and the rotating rod is rotated in the forward direction to close the opening and pull it up to the ground.

[0003]

Among the conventional methods for collecting samples described above, the former requires many samples to be collected because the hollow pipe is inserted many times in each layer, resulting in poor work efficiency. . In the latter case, since the lid is opened and closed by rotating the rod forward and backward, the lid may not be opened and closed depending on the stratum. Therefore, a small amount of sample may be collected. Or, there is a problem that uncured samples with different depths are mixed with each other, and further, the state of the problem could not be confirmed on the ground.

Therefore, there arises a technical problem to be solved in order to efficiently collect the improved column of soft ground without mixing the sample at each depth, and the present invention solves the problem. The purpose is to

[0005]

The present invention has been proposed in order to achieve the above-mentioned object. During rotation, soil cement or the like should be mixed and stirred to be inserted into an improved column with improved soft ground. An empty tube is provided, a plurality of openings are provided in the rotary hollow tube at predetermined depths, and a bottom plate is provided directly below the opening and inside the rotary hollow tube. An opening of the rotary hollow tube is provided at each depth by press-fitting a sampling rod formed by contacting a slide plate for opening and closing the opening with an outer surface of the rotary hollow tube into the improved column. To provide a sample sampling method for an improved ground in which a sample at each depth is taken into the rotating hollow tube through the opening, the opening is closed, and the rotating hollow tube is pulled up to the ground to collect the sample. To do.

[0006]

The sample collecting rod is connected to the rotary shaft of the excavation stirring rod, and the slide plate is slid to close the opening provided in the rotary hollow tube. Next, the sampling rod is pressed into the soft ground improvement column. At this time, the sampling rod may be rotated. When the sample collecting rod is press-fitted to a predetermined depth, the slide plate is slid to open the opening of the rotary hollow tube, and the sample collecting rod is rotated to close the opening. A sample is taken into the rotating hollow tube through the opening. At this time, if a scraper is provided so as to protrude from the side of the opening, the scraping operation of the scraper improves the sampling efficiency of the sample. The samples collected in the rotary hollow tube are collected at each depth and do not mix with each other. Therefore, the slide plate is slid to close the opening, the sampling rod is pulled up to the ground, the slide plate is slid to open each opening, and each sample is opened from each opening. Take out. In this way, each of the taken out samples is taken at a predetermined depth.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. In FIG. 1, reference numeral 1 is a sampling rod. The sampling rod 1 comprises a rotary hollow tube 2 and a slide plate 3 which slides vertically along the outer surface of the rotary hollow tube 2. Thus, the rotary hollow tube 2 is provided with openings 4, 4 ... At predetermined intervals in the axial direction for taking in a sample at each depth in an improved column (not shown). ing. Further, directly below the openings 4, 4, ..., Inside the rotary hollow tube 2, bottom plates 5, 5, ... Are provided, respectively.

A motor 6 is attached to the upper end of the rotary hollow tube 2.
Is provided with a joint 8 for being coupled to a rotary shaft 7 connected to a rotary drive shaft (not shown) of the rotary hollow shaft 2 and the rotary hollow tube 2 is coupled to the motor 6 Is configured to be rotationally driven by. On the other hand, the motor 6 is installed on an elevator (not shown) provided on a reader (not shown) installed on a crawler,
Further, an outer tube 9 having the rotary shaft 7 therein is fixed to the elevating table, and a flange 10 is fixed to the lower end of the outer tube 9.

Further, the slide plate 3 is provided to open and close the openings 4, 4, ... Opened in the rotary hollow tube 2, and the slide plate 3 further comprises the opening 4 , 4 ... corresponding to the mouth portions 12, 12 ...
It is opened vertically. Therefore, the slide plate 3
Are slid up and down along the outer surface of the rotary hollow tube 2 so that the respective openings 4, 4 ... Of the rotary hollow tube 2 and the respective mouths 12, 12, ... Of the slide plate 3 are aligned. Are opened or closed by the slide plate 3.

Further, in order to make the sliding movement of the slide plate 3 up and down smooth, guides 13, 13 ...
Is provided. Further, arms 14, 14, ... Are provided under the flange 10 fixed to the lower end portion of the outer pipe 9, and a fixing ring 15 having a U-shaped cross section is further provided at the lower end portions of the arms 14, 14. It is fixed and the fixing ring 1
A ridge 16 provided at the upper end of the slide plate 3 is loosely fitted in the recess 11 of the slide plate 5.

Brackets 17 and 17 are provided on both side surfaces of the upper end of the outer tube 9 so as to project therefrom.
And the motor 6, the elevating cylinders 18, 18 are interposed, and the elevating cylinders 18, 18 extend and retract to move the outer tube 9 up and down. The slide plate 3 is moved up and down via a ridge 16 loosely fitted to the fixed ring 15, and the openings 4, 4, ... Provided in the rotary hollow tube 2 are formed so as to be openable and closable. .

Further, the openings 4, 4 are provided for taking in the sample corresponding to each depth in the improved column which has improved the soft ground, but in order to efficiently take in the sample. Scrapers 19, 19 ... Are projectingly provided on the outer surface of the rotary hollow tube 2 immediately before the openings 4, 4 ... That is, the scraper 19, 19 ... Is configured so that the sample at each depth in the improved column can be scraped and taken into the respective openings 4, 4 ,. Further, at the positions of the openings 4, 4, ..., The rotary hollow tube 2 may be provided with a box body having openings facing the openings 4, 4 ,.

Next, an embodiment of the present invention will be described. Sliding plate 3 by extending the lifting cylinders 18, 18
And lower the rotary hollow tube 2 with the slide plate 3.
The openings 4, 4 ... Are closed. The sampling rod 1 is pressed into the improved column to a predetermined depth. Further, at the time of press-fitting, the sample-collecting rod 1 can be rotated and press-fitted.

The elevating cylinders 18, 18 are contracted to raise the slide plate 3, and the openings 12, 12 ... Provided on the slide plate 3 are aligned with the openings 4, 4 ,. Open the parts 4, 4 ... into the improved columns. The rotary hollow tube 2 is rotated by driving the motor 6. At this time, the scrapers 19, 19 ... scrape each sample at each depth in the improved column to open the openings 4, 4
From the above, the samples are taken into the rotary hollow tubes 2, respectively. Therefore,
The samples taken at each depth are not mixed with each other by the bottom plates 5, 5, ....

The slide plate 3 is mounted on the lifting cylinders 18, 1.
8 in the contraction operation of 8, and then the openings 4, 4
Is closed by the slide plate 3. The sampling rod 1 is pulled up to the ground. The slide plate 3 is slid to release the openings 4, 4 ... And the samples for each depth are taken out.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention covers the modifications.

[0017]

According to the present invention, as described in detail in the above-mentioned one embodiment, the rod for sampling can be press-fitted into the improved column to collect the sample at each depth in the improved column without being mixed. . In addition, the invention is able to surely collect each sample in each layer by a single operation and improve working efficiency.

[Brief description of drawings]

FIG. 1 is a front view of an apparatus used in an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 Sampling Rod 2 Rotating Hollow Tube 3 Slide Plate 4 Opening 5 Bottom Plate 6 Motor 7 Rotating Shaft 8 Joint 9 Outer Tube 10 Flange 11 Recess 12 Port 13 Guide 14 Arm 15 Fixing Ring 16 Projection 17 Bracket 18 Lifting Cylinder 19 scrapers

Claims (1)

[Claims] 1. A rotary hollow tube to be inserted into an improved column having improved soft ground by mixing and stirring soil cement or the like, and the rotary hollow tube is provided with a plurality of openings at predetermined depths. And a bottom plate is provided inside the rotary hollow tube immediately below the opening, and a slide plate for opening and closing the opening is in contact with the outer surface of the rotary hollow tube. The rod for sampling is press-fitted into the improved column, the opening of the rotary hollow tube provided at each depth is opened, and the sample for each depth is taken into the rotary hollow tube through the opening, and the opening A method for sampling the improved ground, characterized in that the portion is closed and the rotary hollow tube is pulled up to the ground to collect the sample.