JP2742528B2 - Penetration rods for Swedish sounding surveys - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a penetrating rod comprising a plurality of penetrating members including a screw point mounted on a tip and having a weight integrally mounted thereon, the penetrating rod being erected perpendicularly to the ground, The penetration of a so-called Swedish sounding survey device is used in which the rotation of the penetration rod and the self-sinking due to the load of the weight, that is, the excavation length, are observed, and the degree of firmness and firmness of the ground is determined based on the rotation speed of the penetration rod with respect to the excavation length. It is about a rod.

[0002]

2. Description of the Related Art Conventionally, a penetrating rod used for relatively small-scale ground surveys such as the aforementioned Swedish sounding survey has been extended by a triangular screw or a square screw regardless of the outer diameter of the rod. Was common.

[0003]

However, when the above-mentioned screw type connection method is used, especially when the connection is long and the resistance of the ground is strongly applied, only the penetrating rod located at the upper portion rotates at the time of reversal, and the connection is performed. In addition to the problem that the screw is loosened at a location where the location is weakly tightened, the thread is separated from the penetrating rod located at the lower part, and there is also a problem that the attachment / detachment takes time and is complicated.

The present invention has been made in view of the above circumstances, and is intended for a Swedish sounding investigation in which a penetration rod can be relatively easily added and a connected state can be maintained irrespective of normal rotation and reverse rotation. The purpose is to provide a penetration rod.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, a penetrating rod for a Swedish sounding according to the present invention has a plurality of penetrating members made of a magnetic metal and a tapered taper formed on an end face thereof. The connecting hole is formed in a rod shape through a connecting portion formed by a combination of a connecting shaft protruding with a shape substantially equal to the connecting hole, and is connected to the peripheral wall and the connecting shaft of the connecting hole with respect to the longitudinal direction of each penetrating member. Providing orthogonal through holes respectively, aligning the peripheral wall of the connection hole and the through hole of the connection shaft in the penetrating member to be interconnected,
It has a length communicating with the through holes of both penetrating members, and is formed by inserting a magnetic lock pin.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of a penetrating rod for a Swedish sounding investigation according to the present invention will be described with reference to the drawings. FIG. 5 is a schematic diagram showing an example of an apparatus used for a Swedish sounding survey. The device comprises a handle 8, a penetrating rod 12 and a screw point 17 for digging the ground, a loading clamp 9, a weight 1
4 and a bottom plate 10, a handle 8 extending horizontally to the left and right is attached to the upper end of the penetrating rod 12, a loading clamp 9 is fixed to an intermediate portion, and a screw point 17 is attached to the lower end. The penetrating rod 12 is erected perpendicular to the ground, and the weight 14 is gently placed on the loading clamp 9 while being careful not to bend and penetrate.
A penetration test is performed while applying no force in the vertical direction by human power other than the rotational torque given by the handle 8. The penetrating rod 12 is attached to an extension rod 16 and a screw point 17 for excavating the ground by being attached to the tip.
And the like are connected in a rod shape.

The penetrating rod according to the present invention is made of a magnetic metal such as iron, and has connecting portions 3 having a male-female relationship at both ends for connecting the extension rod 16 at predetermined intervals. The female part of the connecting part 3 is formed, for example, by forming a cylindrical connecting hole 1 whose inner diameter becomes slightly smaller toward the back in the longitudinal direction at one end face of the extension rod 16, and The portion is formed by projecting a connection shaft 2 having substantially the same shape as that fitted into the connection hole 1 from the other end face. In the peripheral wall 4 and the connecting shaft 2 of the connecting hole 1 forming the female part and the male part, through holes 5 and 6 facing each other when the extension rod 16 or the screw point 17 to be connected to each other are fitted are formed in each of them. Each of the through holes 5 and 6 is provided so as to pass through the core of the penetrating member and to be orthogonal to the longitudinal direction of the penetrating member. 4 and the connecting shaft 2 are uniformly defined.

[0008] Lock pins 7 for preventing separation are inserted into the through holes 1 of each connecting portion 3. Due to the presence of the lock pin 7, the extension rods and the like connected in phase are fixed in the rotation direction and the vertical direction. Therefore, it is necessary to secure the strength at which the lock pin 7 and the through holes 5 and 6 for inserting the lock pin 7 are not twisted or damaged during the test.
Further, each penetrating member penetrating into the ground such as the extension rod 16 and the screw point 17 is made of a magnetic metal as described above, while the lock pin 7 is made of a so-called permanent magnet having magnetism. . The diameters of the through holes 5 and 6 provided in the peripheral wall 4 of the connection hole 1 and the connection shaft 2 for loading the lock pin 7 are set slightly larger than the diameter of the lock pin 7.

The connecting operation of the penetrating member is extremely easy, such that the male part and the female part are fitted to each other, the through-holes 5 and 6 are aligned, and the lock pin 7 is inserted. Even after the pin 7 is inserted, the pin 7 is not easily deviated by vibrations or the like generated by the operation due to the action of the magnetic force, and a stable connection state can be maintained. Further, after the work is completed, the extension rod 16 and the like can be easily separated by the work of pushing out the lock pin 7 from the through holes 5 and 6 using a thin rod or the like, and the removed lock pin 7 is originally magnetic. So that it is less likely to be lost if it is attached to the handle 8, the weight 14, or the like.

Further, as described above, the connecting hole 1 and the connecting shaft 2 are
By setting the taper to be approximately equal in shape, even if the connecting shaft 2 is slightly loose with respect to the connecting hole 1, the connecting surface of the male part and the female part in the connecting part 3 of each penetrating member in the excavation process is formed. Since it is in a state of being constantly in close contact with each other, it is possible to reduce the run-out of each connecting portion 3 during the test. In the above embodiment, the connecting hole 1, the connecting shaft 2, and the lock pin 7
Although it was formed into a cylindrical shape in consideration of ease of loading and unloading and manufacturing cost, a predetermined function can be performed even if it is formed into a prismatic shape.

[0011]

As described above, the use of the penetrating rod for sounding investigation in the Swedish style according to the present invention makes it possible to unscrew a long penetrating rod or the like at the time of reversal as in the conventional screw-type coupling method. The problem of separation from the penetrating rod located at the bottom and the problem of taking time to attach and detach are solved, and it is also possible to open and close the intake of the sampling cylinder using the forward and reverse rotation of the penetrating rod As a result, if a penetrating member that is a sampling cylinder is attached to the tip of the penetrating rod instead of the screw point,
For example, sampling in a soil cement column can be performed using the same penetration test equipment.

[Brief description of the drawings]

FIG. 1 is a side view of an essential part showing an example of a penetration rod for a Swedish sounding investigation according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a perspective view showing an example of a Swedish sounding investigation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection hole 2 Connection shaft 3 Connection part 4 Perimeter wall 5 Through hole 6 Through hole 7 Lock pin

Claims (1)

(57) [Claims] A plurality of penetrating members made of a magnetic metal are formed by connecting a tapered connecting hole (1) formed in an end face thereof and a connecting shaft (2) protruding with a shape substantially equal to the connecting hole (1). A rod-like connection is made through a connection part (3) of the combination, and a through hole perpendicular to the longitudinal direction of each penetrating member is formed in the peripheral wall (4) of the connection hole (1) and the connection shaft (2). 5, 6) are provided, and the peripheral wall (4) of the connection hole (1) and the through-holes (5, 6) of the connection shaft (3) of the penetrating members to be connected to each other are aligned with each other, and the through-holes ( A penetrating rod for a Swedish sounding investigation, characterized in that it has a length communicating with (5, 6) and is inserted through a magnetic locking pin (7).