JPS5817988A - Method and apparatus for collecting sample in geologic boring survey - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention provides a method for collecting samples of clay layers, silt layers, etc. by digging them into the ground in order to investigate the condition of underground soil when conducting geological poling surveys, and the method. Regarding equipment.

Generally speaking, polling for this type of geological survey begins with the fifth
As shown in Figure a, by using the casing construction method, long casings C are sequentially added while excavating to a predetermined depth, and the soil inside is released to the ground to form a bore hole with a casing wall in the ground. After that, as shown in Figure 5, the polling jid R with the sample collection tube P attached to the tip is inserted into the hole drilling, and when the sample collection tube P reaches the bottom of the hole drilling, The sampling tube P is forced into the ground by a boring machine M holding a boring rod R, thereby allowing the sampling tube P to sample a sample 8 at a predetermined depth.゛By the way, there is a sample S in this collection tube P.
The most important thing in collecting the sample S is to extract the sample S in its entirety from the underground soil failure without applying any external load. If the specimen S cracks or twists during collection, or if it is collected into the collection pipe P in a mixed state, it will not be possible to accurately determine the degree of compaction of the soil, strata, etc., and the purpose of the geological survey will not be achieved. Can not do it.

In the conventional sample collection method, as shown in No. The sample collection tube P that is attached is inserted into the drilling hole, and when the sample is collected by being press-fitted into the soil at a predetermined depth, the sample collection tube P shakes and the sample S inside the collection tube P is sucked. In many cases, accurate samples could not be collected due to cracks, etc.

This invention was made in order to solve the above-mentioned difficulties, and its gist is to allow an 11&-ring machine to hold a long guide casing, and to fit a boring machine into the long guide casing. , the long guide casing is responsible for guiding insertion into the hole being drilled, and the boring rod is solely responsible for rotating work, thereby preventing the swinging of the polling rod.

An embodiment of the present invention will be described below with reference to the drawings. 2 First, in FIG. 1, an embodiment of the present invention is schematically shown. A long guide casing 2 is vertically inserted into a boring machine 1 and is held by a chuck device 3. A boring rod 4 is fitted into the guide casing 2, and a driving source 6 such as a motor is connected to the upper end of the boring rod 4 via a flexible rotating wire 5, and a sample collection tube 7 is attached to the lower end of the boring rod 4. A water injection pipe 8 for supplying jet water for digging cocoons is attached to the upper end of the long guide casing 2, and is connected to a water supply cap i and a pump 10 via a water injection hose 9.

To explain in more detail in FIG. 2, the boring machine 1 is fixed with a guide pipe 11 for inserting the casing, and equipped with long hydraulic cylinders 12° 12 for press-fitting the casing on both sides of the guide pipe 11. At the same time, a short hydraulic cylinder 13.13 for the casing chuck is arranged on the same axis, and each piston rod 12
a tl 2a +1 aa sl sa are connected by lock nuts 14.14.

As shown in FIG. 3, the chuck device 3 includes a slide ring 15 that is integrally connected to the cylinder tubes 13b, 13b of the short hydraulic cylinder 13.13 and moves up and down in the axial direction, and a tapered protrusion of the slide ring 15. A pair of chuck claws 17 that are engaged with the portion 16 and reciprocate in the radial direction.
．． It consists of 17. and short hydraulic cylinder 13.13
As mentioned above, the inner pistons 1sc and lac are connected to the piston rods 13a and 13a by screws 12 for press-fitting.
Since the cylinder tubes 13a and 12a cannot be integrally connected and moved, when pressure oil is sent from one boat 18 installed in the cylinder tubes 13b and 13b, the cylinder tubes 13
b, 13b moves downward, and the slide ring 15 integrated with this
slides in the axial direction, and is thereby pressed by the tapered protrusion i16 that engages with the engagement groove 19, so that the chuck claws 17 and 17, which are arranged at 7100 mm intervals, protrude radially oppositely, and are used for inserting the casing. The long guide casing 2 inserted through the guide pipe 11 and the casing insertion hole 20 communicating therewith is chucked by the chuck claws i7, 17. Therefore, by operating the long hydraulic cylinder 12.12 for press-fitting the casing in this state, the long casing 2 is inserted into the hole being drilled. As shown in FIG. 4, the poring and grout 4 fitted into the long guide casing 2 are supported by bearings 21, 22, 23 at their upper and lower ends, and a metal 24 is attached to the middle part thereof. .25, so that it can only rotate freely without moving in the axial direction, and furthermore, the long guide casing 2 and boring rod 4 are guided so that they can be added sequentially according to the drilling depth. Female and male threaded portions 2a #2b are provided on the circumferential surface of the upper and lower ends of the casing 2.
are formed, and a square shaft part 4a and a square hole part 4b are formed at the upper and lower ends of the boring rod 4.

The sample collection tube 7 consists of a part 30 that rotates together with the boring rod 4 attached to the bracket part 26, and the central shaft 28 has an air vent hole 31 formed therein and a check valve 32. Built-in. When the sample S is collected into the inner tube section 30, the outer tube section 27 is rotated by the bearing 29, but the inner tube section 30 is press-fitted into the soil without rotating, thereby applying as much external load to the sample S as possible. Care must be taken not to overdo it.

In addition, each long guide casing 2, polling rod r4, and sample collection tube 7 each have a water passage hole 33° and an inner tube portion 30.
Jet water is released from between the pipes and the pipe to assist in press-fitting the sampling pipe 7.

This invention has the above-mentioned structure6. In using this, the long guide casing 2 and the 'boring rod 4 assembled into a unit are sequentially added during a hole drilled by the casing method. When it reaches the bottom of the drilling hole, the poling 2 is chucked by the chuck device 3, and the long guide casing 2 is advanced into the circumcision using the press-fitting hydraulic cylinders 12, 12, and the boring rod 4 is rotated, and jet water is applied. By supplying the sample S, the sample collection tube 7 at the tip of the polling rod is forced into the soil at the bottom of the borehole, and the sample S is collected.

Therefore, according to this invention, a boring rod that can only rotate is fitted into a long guide casing that is held in a boring machine and driven only in the axial direction without rotating, and the boring rod is drilled by the long guide casing. Since the entire area of the boring rod 9 is pivoted by a long guide casing that enters inside and maintains accurate axial movement, the sample collection tube at the tip of the rotatably driven boring rod does not shake at all during sample collection. Accurate samples can be collected from underground soil without fear.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram schematically showing an embodiment of the present invention;
Fig. 2 is an external view of the same main part, Fig. 3 is an enlarged sectional view of the main part, Fig. 4 is an enlarged sectional view of another main part, and Fig. 5 is a general step of this kind of sample collection process. The explanatory diagram and FIG. 6 are explanatory diagrams schematically showing a conventional example of this type. 1... Boring machine, 20. Long guide cushing, 30. Chuck device, 411@. Boring rod, 7. Sample collection, taking tube. Out 1ff person to the ceremony company Yubilon facto - d ship t4 i ψ虱

Claims (1)

[Claims] / A boring rod that can only rotate is fitted into a long guide casing that is held in a boring machine and moves only in the axial direction without rotating. A sample collection method for geological poling surveys in which a long guide casing that is driven in a direction is inserted into the ground, and a sample is collected using a sampling tube at the tip of a boring rod. E. Mount the long guy F casing on the boring machine so that it can only move in the axial direction without rotating, and install the boring machine on the long guy casing so that it can only rotate freely, and the tip of the boring rod A sample collection device for geological poling surveys, which consists of a sample collection tube attached to the top.