CN101592564B - Press-in self-flow sampler and sampling method for silt stockpile and dredging filling site - Google Patents

Abstract

The invention provides a press-in gravity sampler structure for acquiring a high-water content flow state soft soil or sludge undisturbed sample in a sludge field or dredge fill field and an installation and using method. The press-in gravity sampler structure can sample according to the conditions of soft flow state soil in the depth direction of the sludge storage yards and dredge fill fields. The whole structure of the sampler comprises three parts: 1) a fixed semi-cylinder, 2) a sliding semi-cylinder, and 3) an internal transverse separation insert piece. The sampler adopts modular design and can control sample separation length as well as the size of a sampling region and sampling precision. During use, the sampler is simple, light, simple and convenient in operation, high in efficiency and low in sampling cost.

Description

Press-in self-flow sampler and sampling method for silt stockpile and dredging filling site

technical field

The invention relates to a portable in-situ sampler and sampling method for soft soil with high water content in fluid state or silt in the original state used in silt storage yards and dredging land reclamation sites. The utility model relates to a light-duty in-situ test instrument designed for the rare soft fluid state soil condition in the depth direction, and belongs to the related technical fields of geotechnical engineering and environmental engineering.

Background technique

In river dredging and dredging projects and sea reclamation projects, the problem of dredging and filling consolidation of soils with high water content will be encountered. For a site filled with high water content silt, if the drainage of the site is not smooth or the clay content of the dredged fill soil is high, the consolidation and settlement will be a long process. During this long process, after a long period of wind, sun and surface evaporation, a thick hard shell layer will be formed on the surface of the dredged fill soil layer, mixed with the rhizome residues of herbaceous plants, making the topsoil have a certain surface However, most engineering monitoring results show that the soil still maintains a high water content at a certain depth underground, even in a semi-fluid state close to the initial state; although the surface soil has a certain strength and can be walked on , but it is difficult for some small drilling machines to enter the site, let alone large machines. For projects that are eager to use land for further engineering and for land acquisition projects that resume farming as soon as possible, the difficulty in geotechnical survey of the dredged reclamation site is a restrictive problem. Conventional drilling and sampling methods are not suitable for dredging and filling sites. First, the drilling machinery is too heavy, and the surface of the mud cannot bear such a weight. Second, even if an integral sample can be taken out, it will flow during transportation and destroy the original sample. Some structural features. In addition, some commonly used in-situ geotechnical tests with good reliability and accuracy, such as standard penetration test, cross-plate test, static penetration test, etc., all require preliminary engineering geological exploration. Therefore, it is urgent to develop a light-duty portable sampling instrument that can obtain undisturbed and undisturbed samples in the thin and soft flowing mud layer in the mud stockpile and dredging landfill, so as to solve the practical problems in the project.

Contents of the invention

The purpose of the present invention is to propose a portable multifunctional sampler and a corresponding sampling method that can carry out drilling and sampling in the thin and soft fluid mud layer of the silt stockyard and the dredging filling site, so as to solve the problem when other large drilling machines cannot enter the site. Sampling operation problems, give sampling results, and provide reliable geological data for engineering. The present invention is mainly applicable to silt storage yards and silt dredging filling sites, under which there is a thin and soft silt layer and the bearing capacity is weak.

Solution of the present invention

The present invention proposes a portable press-in self-flowing sampler and a corresponding sampling method that can be drilled and sampled in the thin and soft fluid mud layer of the silt stockyard and the dredging filling site, and its overall structure includes 3 parts: 1) fixed semicircle cylinder. 2) Slide half cylinder. 3) Internal diaphragm inserts.

Wherein 1) the fixed half-cylinder is a structure in which the end of the half-cylinder is welded with a conical drilling cap, and the end of the side wall of the half-cylinder is left with a concave dovetail slot, which slides back and forth in cooperation with the sliding half-cylinder. The inner wall of the semi-cylindrical structure has slots for the transverse inserts at equal intervals, which can firmly fix the transverse inserts; there is a locking pick on the top of the fixed semi-cylinder, which is used to lock the sliding semi-cylinder so that the sliding semi-cylinder cannot slide; The outside of the fixed semi-cylinder is also engraved with a size scale to monitor the depth of the sampler inserted into the soil.

Wherein 2) the sliding semi-cylinder is a semi-cylindrical structure with a convex dovetail tenon at the end of the side wall, which matches with the concave dovetail slot of the fixed semi-cylindrical and can slide up and down. When the sliding half-cylinder is in contact with the conical drilling head, the sampler is closed and completely isolated from the outside world.

Wherein 3) the internal diaphragm insert is a circular sheet structure, and its diameter is consistent with the inner diameter of the semi-cylindrical cylinder. The internal diaphragm insert is a structure used to separate the sludge sample, and the distance of the insert can be flexibly selected according to the sampling requirements.

Sampling method:

1) Place the self-flowing silt sampler at the predetermined drilling sampling point, and dig out the hard crust on the silt surface.

2) Push the sliding half cylinder to the bottom, turn the locking paddle, and lock the sliding half cylinder, making the whole sampler a sealed whole. Press the sampler down into the soil to the desired depth.

3) Keep the fixed semi-cylinder still, unlock the locking paddle, pull up the sliding semi-cylinder to expose the internal sample loading space of the sampler, push and slide the semi-cylinder downward after a period of time, and pour the soil samples flowing into the sample loading space Seal it up.

4) Lock the sliding half cylinder again, and pull the whole sampler out of the mud surface.

5) Open the sliding half cylinder and take out the soil sample.

Advantages of the invention

The press-in self-flowing sampler proposed by the present invention and its use method can overcome the shortcoming that the moisture content of the original sample is easy to change when there is a high-moisture thin soft fluid state mud layer in the blow-fill yard sampling; and the sampler is light. Portable features allow it to be used when the surface bearing capacity of soft soil or silt is insufficient; the press-in self-flowing sampler adopts a modular design, which can control the length of the sampling partition, the size and accuracy of the sampling interval, and the sampling volume at the same time can be guaranteed. The sampler device is simple, light in weight, easy to operate, high in efficiency and low in sampling cost.

Description of drawings

Attached drawing A is the fixed semi-cylinder and internal diaphragm insert

Accompanying drawing B is a sliding half cylinder

Accompanying drawing C is the schematic diagram of the combination of fixed and sliding semi-cylinders

In the figure: 1) Fixed semi-cylinder, 2) Diaphragm insert, 3) Concave dovetail slot, 4) Conical drilling cap, 5) Sliding semi-cylinder, 6) Convex dovetail tenon.

Specific implementation steps:

1) According to the pre-determined sampling partition length, select the layout density of the internal diaphragm insert 2), insert the diaphragm insert 2) into the fixed semi-cylinder 1), and slide the convex dovetail on the semi-cylinder 5). The tenon 6) is aligned with the concave dovetail slot 3) on the fixed semi-cylinder 1) and then inserted into the sliding semi-cylinder 5);

2) Place the self-flowing silt sampler at the predetermined drilling sampling point, and dig out the hard crust on the silt surface.

3) Push the sliding semi-cylinder 5) to the bottom, and turn the locking paddle to lock the sliding semi-cylinder 5), so that the entire sampler becomes a sealed whole. Press the sampler down into the soil to the desired depth.

4), keep the fixed semi-cylinder 1) still, unlock the locking paddle, pull the sliding semi-cylinder 5) upwards to expose the internal sample loading space of the sampler, push down the sliding semi-cylinder 5) after a period of time, and the inflow The soil sample in the sample loading space is sealed.

5), lock the sliding half cylinder 5) again, and pull out the whole sampler from the mud surface.

6), open the sliding semi-cylinder 5), and take out the soil sample.

Claims (4)

1. A press-in self-flowing sampler for silt storage yards and dredging filling sites. Its overall structure includes 3 parts: 1) fixed semi-cylinders, 2) sliding semi-cylinders, 3) internal diaphragm inserts, and Features are: 1) The fixed semi-cylinder is a structure in which a conical drilling cap is welded at the lower end of the semi-cylindrical, concave dovetail slots are left at the end of the side wall of the semi-cylindrical, and diaphragm inserts are left at equal intervals on the inner wall of the semi-cylindrical structure the slot, 2) The sliding semi-cylinder is a semi-cylindrical structure, with a convex dovetail tenon at the end of the side wall, which matches with the concave dovetail slot of the fixed semi-cylindrical, and can slide up and down. 3) The internal diaphragm insert is a circular sheet structure, and its diameter is consistent with the inner diameter of the semi-cylinder. 2. According to claim 1, the press-in self-flowing sampler used for silt storage yards and dredging filling sites is characterized in that there is a locking paddle at the top of the fixed semi-cylinder, which is used to lock the sliding semi-cylinder so that the sliding semicircle The barrel cannot slide. 3. According to claim 1 or 2, the press-in self-flowing sampler for silt stockyards and dredging filling sites is characterized in that the outer side of the fixed semi-cylinder is engraved with a scale to monitor the depth of the sampler inserted into the soil . 4. a kind of sampling method based on the described self-flow type sampler that is used for silt stockyard and dredging filling site according to claim 1, its steps: 1) Place the press-in self-flowing mud sampler at the predetermined drilling sampling point, dig out the hard crust on the mud surface, 2) Push the sliding semi-cylinder to the bottom, turn the locking paddle, and lock the sliding semi-cylinder so that the entire sampler becomes a sealed whole, and press the sampler down into the soil until the predetermined depth, 3) Keep the fixed semi-cylinder still, unlock the locking paddle, pull up the sliding semi-cylinder to expose the internal sample loading space of the sampler, push and slide the semi-cylinder downward after a period of time, and pour the soil samples flowing into the sample loading space seal it up, 4) Lock the sliding half cylinder again, pull the whole sampler out of the mud surface, 5) Open the sliding half cylinder and take out the soil sample. the

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