JPH0119069Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a core sampler for collecting sediment, which collects samples by driving a core tube into underwater sediment.

Generally, as a sampler for collecting underwater sediment for dredging, etc., a cylindrical core tube is weighted with a counterweight, and by allowing it to fall naturally from the water surface, it is driven into the underwater sediment and sample sediment is collected. is used. This type of natural fall type sampler is mostly used for clayey soil, and if the purpose is to collect sand or gravel, it is not practical because it must be a heavy sampler of 100 kg to 200 kg. Nakatsuta.

On the other hand, a sampler has also been developed in which a cylindrical sampler with a vibrator attached to the top is driven into the subsoil while vibrating, but this requires a generator and hydraulic equipment, is expensive to manufacture, and is not easy to use. It was hot.

In view of the above-mentioned problems, the purpose of this invention is to provide a core sampler that can easily collect sand and gravel from the bottom of the water, etc., using a device with a simple structure and simple operation. The core tube has a hollow cylindrical core tube with a core catcher at the lower end for opening and closing the opening thereof, and a weight supported at the upper end of the core tube via a vertical shaft. In a core sampler for collecting soil and sand, which can be freely connected to a hanging rope at the upper end, the weight is formed into a substantially streamlined shape with a slightly thicker upper part at the lower end, and has a wing plate at the upper end for regulating the posture of falling into water. The vertical shaft passes through the center of the weight, and the weight is supported so as to be movable by a fixed stroke with respect to the vertical axis, and one end is provided on the upper surface side of the core catcher and on the inner surface of the core tube. The present invention relates to a core sampler for collecting soil, which is characterized by being equipped with a fixed cylindrical flexible thin film.

Next, an example of implementation of the present invention will be described with reference to the drawings. In the figure, 1 is a cylindrical core tube, and a shoe 2 is attached to the lower end of this core tube 1. The shoe 2 is formed into a short cylindrical shape, and its upper portion is screwed into and fixed to the outer periphery of the lower end of the core tube 1, and the lower end edge has a tapered cross section. Further, a core catcher 3 is provided at the lower end of the core tube 1 . This core catcher 3 has a large number of elastic shielding plates 4, 4, curved in an arc shape, and the lower end of each elastic shielding plate 4 is fixed to a stopper 5 to form a check valve shape. The earth and sand is forced into the elastic shielding plates 4, 4... from the lower end side by spreading them apart, but depending on the gravity of the pressed earth and sand, the elastic shielding plates 4, 4... are pushed downwards. Efforts are being made to prevent soil from spreading and being washed away as much as possible. Further, the lower end of a cylindrical flexible thin film 7 is fixed to the inner circumferential surface of the core tube 1 above the mounting portions of the elastic shielding plates 4, 4, . . . .

On the other hand, a sampler head 9 containing a check valve 8 is attached to the upper end of the core tube 1. As shown in FIG. 3, this sampler head 9 consists of a tube-side member 9a screwed into the upper end opening of the core tube 1 and a weight-side member 9b to which a weight (described later) is attached.
9b are screwed together to form a valve chamber 10 spanning both members 9a and 9b. A flow path 11 communicating with the core tube 1 is formed on the tube side member 9a side of the inner surface of the valve chamber 10, and a flap-shaped valve seat 12 is formed at the upper end of the flow path 11.
is formed, and a tapered valve body 1 is formed on this valve seat 12.
The check valve is configured such that the valves 3 and 3 are fitted together by their own weight. Further, the weight side member 9b is formed with a drainage channel 14 which is open at one end and communicated with the valve chamber 10 at the other end on its outer periphery. On the other hand, the lower end of the vertical shaft 15 is screwed into the center of the weight side member 9b and connected thereto. This vertical axis 15 is arranged on the same center line as the core tube 1 and extends upward. A weight 16 is fitted onto the vertical shaft 15 so as to be slidable in the axial direction. The weight 16 is formed into a substantially streamlined shape with the bottom end slightly thicker at the upper end, and a pair of guide rods 17, 17 are protruded from the upper end of the weight 16 in a parallel arrangement with each other.
A vane plate 18 is provided at the upper end of the blades 7 and 17.
A sliding hook 19 fixed to the upper end of the vertical shaft 15 is inserted into both guide rods 17, 17.
9 prevents the weight 16 from coming off.

Further, the blade plates 18 at the upper end are projected radially at equal intervals around the center line of the weight 16, so that the angle thereof becomes vertical when freely falling in water. A ring 21 for connecting a hanging rope 20 is integrally provided at the center of each wing plate 18.

To collect samples from the bottom of the water using the core sampler configured as described above, for example, the hanging rope 20 is tied to the ring 21, and the core sampler is allowed to fall freely from the ship to the bottom of the water. During this free fall, the entire sampler is oriented vertically due to the water resistance against the blade plate 18 and reaches the bottom of the water, and the entire sampler including the weight 16 is driven into the bottom sediment at the free fall speed. If the bottom sediment is compacted sand or gravel and cannot be driven in sufficiently, pull the hanging rope 20 and lift the weight 16 by that stroke and then release it, allowing only the weight 16 to fall freely and reach the sampler head. 9, and repeat this a desired number of times depending on the soil quality of the water bottom to drive the core tube 1 into the soil.

In this way, the core cube 1 is placed in the bottom sediment.
The earth and sand are forced into the core tube 1 by driving the earth and sand, and then the hanging rope 20 is pulled to extract it from the earth and raise it above the water. During this lifting, the earth and sand in the core chamber 1 is lowered to the position where the core catcher 3 is closed, but as the core catcher 3 closes, the flexible thin film 7
is pushed down together with the earth and sand and covers the upper surface of the shielding plates 4, 4, . . . of the core catcher 3, preventing further earth and sand from flowing down.

In addition, some conventional samplers are equipped with a core catcher similar to the present invention inside their tip, but if only a core catcher is used, especially when sampling sandy soil, In many cases, the sampled soil flows out with water and cannot be sampled, but with the sampler of the present invention, even sandy soil can be completely sampled due to the action of the flexible thin film 7 described above.

The core sampler for soil sampling of the present invention is constructed as described above, and has a vertical shaft extending from the upper end of the core cube that supports a weight that can move up and down by a certain stroke, and the upper end of the weight is attached to a hanging rope. As a result, after dropping the sampler to the bottom of the water, the lifting rope must be pulled and the tension released to drive the core tube. equipment is no longer needed,
It can be manufactured at a low cost and is easy to operate, making it possible to easily collect samples of sand and gravel geology.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the overall outline of the core sampler of the present invention, Fig. 2 is an enlarged sectional view with the right half of the lower end of the core tube omitted, and Fig. 3 is an enlarged sectional view with the right half of the sampler head omitted. FIG. 4 is an enlarged cross-sectional view taken along the line--in FIG. 1. DESCRIPTION OF SYMBOLS 1... Core tube, 3... Core catcher, 7... Flexible thin film, 15... Vertical axis, 16...
... Weight, 18 ... Feather plate, 20 ... Hanging rope.

Claims (1)

[Scope of utility model registration request] It has a hollow cylindrical core tube with a core catcher at its lower end that opens and closes the opening, and a weight supported via a vertical shaft at the upper end of the core tube. In a core sampler for collecting soil and sand, which can be freely connected to ropes, the weight is formed into a substantially streamlined shape with a slightly thicker bottom end, and is equipped with a wing plate at the upper end for regulating the posture of falling into water. A cylindrical tube having the vertical shaft penetrated through the center of the weight so as to be movable by a fixed stroke with respect to the vertical axis, and located on the upper surface side of the core carrier and having one end fixed to the inner surface of the core tube. A core sampler for collecting sediment that is characterized by being equipped with a flexible thin film.