JP2006241828A - Method and equipment for taking sample of sediment or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately take a sediment sample in an excavated hole at a predetermined depth by using a relatively simple constitution. <P>SOLUTION: Sample sediment in the excavated hole is taken by using a sediment sampling pipe 9. In the pipe 9, a sediment sampling port 10 is opened when an openable/closable expanded blade 2, which is rotated integrally with an auger screw 1 and provided at the lower end of the auger screw 1, is opened; and the port 10 is closed with a shutter 12 when the expanded blade 2 is closed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sample collection method and apparatus for soil and the like, and more particularly to a sample collection method and apparatus for soil and the like used for confirming a supporting ground layer at the tip of a ready-made pile set in the ground. .

  Conventionally, construction methods for ready-made piles include a method of excavating a vertical hole for pile construction in the ground in advance, inserting the ready-made pile into this vertical hole, and then performing a hammering or rooting treatment to make the pile foundation, There is a construction method in which excavation and pile setting are simultaneously performed by an auger screw and a drill bit inserted into the hollow portion. At this time, the depth of the supporting ground layer is determined based on the soil column diagram created by the soil survey, and it is assumed that there is a supporting ground layer at that position. Is determined.

  As an excavator for excavating the ground, an excavator using an auger screw with an enlarged wing, which has an expandable wing that can be freely opened and closed at the lower end of the auger screw and opens the enlarged wing to construct a bottomed bulb larger than the pile diameter, has already been used. Known (for example, refer to Patent Document 1 and Patent Document 2).

  In addition, when it is necessary to confirm in situ whether or not the support ground layer really exists in the construction method of ready-made piles, conventionally, a method of judging from the fluctuation of the current value of the motor that rotates the auger screw, or the auger screw Then, after excavating to the depth of the support layer, it was slowly pulled up, and a method of visually judging the earth and sand adhering to the auger screw was adopted.

In addition, a method of attaching a soil collecting tool to the tip of the auger screw and visually judging the earth and sand adhering to the periphery of the soil collecting tool has been adopted (for example, see Patent Document 3).
Japanese Patent Publication No. 61-52315. Japanese Utility Model Publication No. 62-35745. JP2003-321829A.

  However, in the sampling method including the sampling method according to Patent Document 3, the auger screw is slowly pulled up after excavation to the depth of the support layer, and when the auger screw or the soil sampling tool is pulled up, Determining the depth of the attached sand when pulling up the auger screw or soil collector so that the earth or sand may fall or the first attached sand may fall in the middle Was difficult and lacked accuracy.

  In particular, in the method according to Patent Document 1, since excavation is once performed, and a new soil sampling tool is attached and the excavation is performed again, there is a problem that it is troublesome and the workability is poor.

  Therefore, a relatively simple configuration causes a technical problem to be solved in order to accurately collect the sediment sample in the excavation hole at a predetermined depth, and the present invention aims to solve this problem. To do.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that an openable openable wing which rotates integrally with the auger screw and is provided at the lower end of the auger screw is opened. Provided is a method for collecting a sample such as earth and sand that collects the sample earth and sand in an excavation hole by using a pipe for earth collection that opens the earth and sand sampling port when the blade is closed and closes the earth and sand sampling port by a shutter when the blade is closed.

  According to this method, when the enlarged wing is opened and a bottomed bulb larger than the pile diameter is constructed, when the earth and sand sampling port is opened and the auger screw rotates, the earth and sand excavated by the enlarged wing is integrated with the auger screw. Collected in a rotating pipe. When excavation with the expansion wing is completed and the expansion wing is closed, the earth and sand sampling port is also closed with the shutter. After the earth and sand collection port is closed, even if the auger screw is pulled up, the earth and sand in the pipe overflows during the pulling up. Or other sediment does not enter the pipe.

  The invention according to claim 2 is an openable and closable enlarged wing provided at the lower end of the auger screw, a pipe for collecting earth and sand which is horizontally attached to the enlarged wing and has a sediment collection port at one end, and the auger screw A shutter provided at a position corresponding to the sediment collection port of the pipe at the lower end, and when the expansion wing is closed, the sediment collection port of the pipe is closed, and when the blade is opened, the sediment collection port is Provided is a sample collection device such as earth and sand configured to open out of a shutter.

  According to this device configuration, in order to build a bottomed bulb larger than the pile diameter, when the expansion blade is opened, the shutter that closed the sediment collection port of the pipe is opened, and when the auger screw rotates, the expansion blade The earth and sand from the excavated area is collected in a pipe that rotates together with the auger screw. When excavation with the enlarged wing is completed and the enlarged wing is closed, the shutter closes the sediment collection port of the pipe. Therefore, even if the auger screw is lifted after the earth and sand sampling port is closed, the earth and sand in the pipe does not overflow during the pulling, or another earth and sand does not enter the pipe.

  According to the first aspect of the present invention, after the sample earth and sand during excavation at a predetermined depth is collected, the earth and sand sampling port of the pipe is closed with a shutter and pulled up. Therefore, the sample soil at the required position can be accurately sampled without entering the pipe. Further, since it can be used simply by attaching a pipe or the like to the auger screw or the enlarged wing, it can be implemented at a low cost with a simple configuration.

  According to the second aspect of the present invention, after collecting the sample earth and sand during excavation at a predetermined depth, the earth and sand sampling port of the pipe is closed with a shutter and pulled up. Therefore, the sample soil at the required position can be accurately sampled without entering the pipe. Further, since it can be used simply by attaching a pipe and a shutter to an auger screw or an enlarged wing, it can be implemented at a low cost with a simple configuration.

  In order to achieve the purpose of accurately collecting the sediment sample in the excavation hole at a predetermined depth with a relatively simple configuration, it rotates integrally with the auger screw and is openable and closable provided at the lower end of the auger screw. A sample collection method for collecting soil and sand samples using a sediment collection pipe that opens the earth and sand sampling port when the expansion blade is opened and closes the sediment collection port when the blade is closed. provide.

Hereinafter, a sample collection device for earth and sand according to the present invention will be described with reference to preferred embodiments. The excavator used in the present invention has an auger screw with an enlarged wing that can be opened and closed at the lower end of the auger screw, and can open the enlarged wing to construct a bottomed root bulb larger than the pile diameter. The case where is used is taken as an example. Since this open / close structure of the enlarged wing is known from, for example, Patent Document 1 and Patent Document 2 described above, description of the detailed structure is omitted.

  As shown in FIG. 1, the auger screw with an enlarged wing is provided with an enlarged excavating portion 4 having a pair of left and right enlarged wings 2, 2 and a central bit 3 at the lower end portion of the auger screw 1. As shown in (a) and (b) of the figure, the expansion blades 2 and 2 can be switched between a closed blade state where the tip is drawn close to the inner center and a closed blade state which is expanded outward. It is.

  And in the collection of the earth and sand sample using the auger screw 1 with an expansion blade, excavation is started with the expansion blades 2 and 2 closed. When the excavation to the predetermined support layer depth is completed, as shown in Fig. 2 (b), a bottomed root ball excavation is performed with the expansion blades 2 and 2 opened, and a soil sample being excavated as described later. Collect. After the collection, as shown in FIG. 3C, the procedure is performed by switching the enlarged blades 2 and 2 back to the closed state and pulling them up as they are. In addition, the line shown with the code | symbol E in FIG. 1 is a blade expansion position.

  2 and 3 show the structure of the enlarged excavating section 4 at the lower end of the auger screw 1. FIG. 2 is a side view of the enlarged excavating section 4. FIG. 3 is a top view of the enlarged excavating section 4. . This enlarged excavation part 4 is detachably attached to the lower end part of the auger screw 1.

  The enlarged excavation part 4 pivotally supports the upper end side of the enlarged wings 2 and 2 via the bracket 6 and the horizontal shaft 7 on the outer cylinder 5. FIG. 4 shows a state in which the enlarged wings 2 and 2 are pivotally supported by the bracket 6 via the shaft 7.

  As shown in FIG. 5, the upper end side of the enlarged wings 2, 2 in the enlarged excavation part 4 has an end 2 a above the part pivoted by the shaft 7 incorporated in the outer cylinder 5. It is connected to a piston that moves in the vertical direction of a hydraulic cylinder (not shown). Then, with the movement of the piston, the expanding blades 2 and 2 rotate up and down around the shaft 7 as a fulcrum and open and close, and the lower tip side is drawn close to the inner center and closed by the two-dot chain line in the figure. It can be switched between a closed blade state and the above-mentioned open blade state expanded outwardly as indicated by a solid line in the figure.

  Among the expansion blades 2 and 2, the expansion blade 2 on one side is fixedly provided with a sub-bit 8 for excavating the bottomed bulb and a metal pipe 9 for horizontal sediment collection for collecting the sample soil. . The pipe 9 serving as a sediment collection case is attached at right angles to the longitudinal direction of the expansion wing 2, but may be fixed to either the upper surface side or the lower surface side of the expansion wing 2, and depending on conditions, The pipe 9 can be provided not only at the base end portion of the magnifying wing 2 but also at a position in the vicinity thereof, at any location in the longitudinal direction of the magnifying wing 2. As shown in FIG. 6, one end of the pipe 9 is opened as a sediment collection port 10, and the other end is closed with a mesh (wire net) 11 so that only water is drained and soil is left, and the sediment collection port 10 is connected to the auger screw 1. It is mounted in the state of facing the direction of rotation. The pipe 9 may be provided on each of the enlarged wings 2 and 2 on both sides, and the number of pipes 9 is not particularly limited.

  A flat shutter (opening / closing plate) 12 is attached to the bracket 6 supporting the enlarged wing 2 to which the pipe 9 is attached in a state of being suspended from the outer bracket 6. The shutter 12 is provided at a position corresponding to the sediment collection port of the pipe 9 at the lower end of the auger screw 1. The shutter 12 is positioned in front of the sediment collection port 10 of the pipe 9 and closes the sediment collection port 10 when the expansion blade 2 is arranged at the closed state, and the expansion blade 2 is brought into the open state. When arranged, the pipe 9 is provided so that it is removed from the front of the sediment collection port 10 and the sediment collection port 10 is open.

  Next, the operation will be described. The auger screw 1 with the enlarged wings keeps the enlarged wings 2 and 2 in a closed state until excavation to a predetermined depth is completed. Therefore, even if excavation is performed during that time, the earth and sand sampling port 10 of the pipe 9 is closed by the shutter 12, so that no earth and sand enter the pipe 9.

  When the excavation to a predetermined support layer depth is completed, the expanding blades 2 and 2 are opened, and the expanded root bulb excavation is performed. When the expansion blades 2 and 2 are opened, the sediment collection port 10 of the pipe 9 moves from the front of the shutter 12 together with the expansion blade 2, and the sediment collection port 10 of the pipe 9 is opened. When the pipe 9 rotates together with the auger screw 1 and the expansion blades 2 and 2, the earth and sand under excavation of the bottomed root bulb is collected from the earth and sand sampling port 10 into the pipe 9 as a sediment sample.

  When the expanded root bulb excavation is completed and the expanded blades 2 and 2 are closed, the earth and sand sampling port 10 of the pipe 9 is again disposed in front of the shutter 12 together with the expanded blades 2 and 2. The sampling port 10 is closed and pulled up together with the auger screw 1 as it is. At this time, since the earth and sand sampling port 10 of the pipe 9 is kept closed, the earth and sand in the pipe 9 does not overflow during the pulling up, or another earth and sand does not enter the pipe 9 and is required. The sample soil at the location can be collected accurately.

  In the above embodiment, the structure in which the pipe 9 is provided on the expansion blades 2 and 2 and the shutter 12 is provided on the bracket 6 is disclosed. However, the shutter 12 is provided on the expansion blades 2 and 2 and the pipe 9 is provided on the bracket 6. The structure may be provided.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

BRIEF DESCRIPTION OF THE DRAWINGS It is a conceptual diagram explaining the outline | summary of this invention, (a) is the time of excavation start, (b) at the time of sample collection, (c) has shown the state after sample collection, respectively. It is a side view of the expansion excavation part in this Embodiment. It is a top view of the expansion excavation part in this Embodiment. It is a principal part expanded side view of the expansion excavation part in this Embodiment. It is a principal part enlarged front view of the expansion excavation part in this Embodiment. The pipe of an expansion excavation part same as the above is shown, (a) is a rear view, (b) is the longitudinal side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Auger screw 2 Expansion wing 2a End 3 Central bit 4 Expansion excavation part 5 Outer cylinder 6 Bracket 7 Axis 8 Subbit 9 Pipe 10 Sediment collection port 11 Mesh 12 Shutter

Claims (2)

  When the openable openable wing provided at the lower end of the auger screw is opened, the earth collection port is opened. When the blade is closed, the earth collection port is closed by the shutter. A sample collection method for earth and sand, etc., characterized in that the sample earth and sand in a borehole is collected using a pipe. An expandable wing that can be opened and closed at the lower end of the auger screw
A pipe for sediment collection that is horizontally attached to the expansion wing and has a sediment collection port at one end;
A shutter provided at a position corresponding to the earth and sand sampling port of the pipe at the lower end of the auger screw,
A sample collection device for earth and sand, etc., configured to close the sediment collection port of the pipe when the expansion blade is closed and open when the blade is opened.

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