JPH11107668A - Signal transmission device for excavation rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to automatically connect a signal transmitting electric circuit in synchronization with the extension of the main body of an excavating rod when adding the excavating rod. SOLUTION: This device comprises an excavation rod main body 1 having a hollow construction with a male joint portion 2 at one end and a female joint portion 3 at the other end, an electric wire protecting pipe 5 inserted to the main body 1 and fixed in axial direction made of a conductive material with a male coupling portion 7 at one end and a female coupling portion 8 at the other end for supporting the electric circuit at a minus side, and a conductive seal ring inserted into the wire protective pipe 5 with a male connecting portion 10 at one end and a female coupling portion 8 for locating both of them closely each other. At the time of extending the main body 1 of the excavation rod, the male and female coupling portions 7, 8 of the wire protective pipe 5 and the male and female coupling portions 10, 13 of the electric wire 6 can be connected respectively at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling rod for drilling a vertical hole or the like in the ground, and more particularly, to a drilling rod which is suitable for a drilling rod which is inserted into the ground by successively adding short rods. The present invention relates to a signal transmission device.

[0002]

2. Description of the Related Art Pile is created by drilling a vertical hole in the ground,
When building a ready-made pile, it is necessary to excavate the vertical hole vertically. Therefore, in general, an electric measuring instrument such as an inclinometer is provided at the excavating head at the lower end of the excavating rod, and the measurement result of this measuring instrument is transmitted to the ground to monitor the state of the excavation as soon as possible. I have.

As a means for transmitting the measurement result of the measuring instrument provided on the excavation head to the ground as described above, the measurement is performed through a signal transmission wire (cable) inserted inside the excavation rod. In the connection portion of a single drilling rod, an electric wire is conventionally connected using a metal outlet or a non-contact type transmitter.

[0004]

However, in the case of using the above-mentioned conventional metal outlet, the connection of the metal outlet at the time of extension of the drilling rod must be performed by a manual operation immediately below the suspended heavy drilling rod. Not only was this very dangerous, but the connection was inefficient.

[0005] In the case of using a non-contact type transmitter, good signal transmission cannot be performed unless the gap between the two terminals is proper. Therefore, the non-contact type transmitter is applied to a drilling rod which is frequently extended. Doing so is difficult in ensuring the accuracy of the gap between the terminals.

[0006]

SUMMARY OF THE INVENTION The present invention eliminates the need for adding a signal transmission line when adding a drilling rod,
It has been made to be able to connect safely, quickly and surely, as a solution, as a solution, a hollow excavation rod body having a male joint at one end and a female joint at the other end. An electric wire protection tube made of a conductive material which is inserted and fixed in the body in the axial direction, has a male connection portion at one end, and a female connection portion at the other end, and carries a negative side electric path, and A wire having a male connection at one end and a female connection at the other end and serving as a plus-side electric circuit, and closely connected between the male connection and the female connection of the wire protection tube. With a conductive seal ring that can be
At the time of extension of the drilling rod body,
The female connecting portion and the male / female connecting portion of the electric wire are simultaneously connected.

[0007] Thus, when the excavation rod is extended, the male and female coupling portions of the electric wire protection tube serving as the minus side electric path when the male and female joint portions of the excavation rod body are fitted and connected, and The male connection and the female connection of the electric wire carrying the positive side electric circuit are automatically connected in synchronization with each other, so that no manual connection work is required and the occurrence of poor connection is avoided.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. In the illustrated embodiment, the excavating rod body 1 such as a screw rod has a hollow in which a male joint 2 is formed at the upper end and a female joint 3 into which the male joint 2 of the other excavating rod body 1 is fitted at the lower end. Each of the joints 2 and 3 has a polygonal shape such as a hexagonal cross section orthogonal to the axis for transmitting rotation after fitting, or a spline fitting as shown in FIGS. It is structured so that the pins 4 and 4 are inserted so as to straddle the female joint portion 3 and the male joint portion 2, and are prevented from being pulled out.

An electric wire protection tube 5 made of a conductive material, for example, a steel tube and carrying a negative electric path is inserted in the inner axial direction of the drill rod body 1, and a positive electric circuit is carried in the electric wire protection tube 5. The electric wire 6 is inserted.

The electric wire protection tube 5 has a male connection portion 7 at the upper end and a female connection portion 8 to which the male connection portion 7 of the electric wire protection tube 5 of the other drill rod body 1 is fitted and connected at the lower end. The distal end of the male connecting portion 7 is provided so as to be slightly buried in the distal end of the male coupling portion 2 of the drill rod body 1, and the female coupling portion of the female rod portion 1 of the female connecting portion 8 is provided. 3 is provided slightly protruding from the inner bottom surface 3a.

The specific structure of the male connecting portion 7 of the electric wire protection tube 5 is shown in an enlarged cross section in FIG. The male connecting member 9 includes a plurality of (four equiangularly arranged guides) 9b, 9b,... The guides 9b, 9b,...
Have a gap L between the outer periphery of the male connecting portion 7 and the guides 9b, 9b,... To which the female connecting portion 8 can fit.

An end of the electric wire 6 is inserted through the center of the shaft of the male connecting portion 7, and a plug-type male connecting portion 10 (transmission electrode) made of a copper alloy or the like is fixed to the end of the electric wire 6. The male connector 7 is inserted into the male connector 7 with an insulating material 11 interposed therebetween, and has a tip 10a slightly protruding from the tip of the male connector 7.

The female connecting portion 8 of the electric wire protection tube 5 is shown in FIG.
As shown in an enlarged cross section in FIG. 2B, a female connecting member 12 is formed by connecting a flange 12a to an end flange 5b of the electric wire protection tube 5 with a bolt by bolts. A socket-type female connection portion 13 (transmission electrode) made of a copper alloy or the like fixed to the portion is inserted through an insulating material 14, and a front-end protrusion 10 a of the male connection portion 10 is inserted into a front-end hole 13 a. They are fitted as closely as possible.

In the circumferential direction of the inner peripheral surface of the female connecting member 12,
A plurality of ring grooves 16 are provided near the outer end thereof for fitting the waterproof sealing thing 15, and a conductive rubber seal ring 17 for securing conductivity between the wire protection tubes 5 and 5 is provided on the inner side. In order to fit a waterproof seal ring 19 for waterproofing between the insulating material 14 and the insulating material 11 of the male connection portion 10 of the electric wire 6, a ring groove 18 is formed. Ring groove 20 is formed.

In FIG. 1, reference numeral 21 denotes a holding member for holding the electric wire protection tube 5 at a predetermined position in the drill rod main body 1.

Therefore, when the male joint portion 2 and the female joint portion 3 of the excavating rod bodies 1 and 1 are fitted together, the male connecting portion 7 and the female connecting portion 8 of the electric wire protection tube 5 are fitted during the fitting process. While the fitting is progressing, the distal projecting portion 10a of the female connecting portion 10 of the electric wire 6 is formed.
Is fitted into the distal end hole 13a of the female connection portion 13 and is electrically connected (see FIG. 5), whereby the plus-side electric circuit is indicated by an arrow a in FIG. The conduction state is obtained as shown by the arrow b.

In this case, the male connecting portions 7 of the electric wire protection tubes 5, 5 are provided.
The above-described conductive rubber seal ring 17 is interposed between the fitting portions of the connecting portions 7 and 8 as shown in an enlarged view in FIG. Even if there is a gap, an electric path is formed as shown by an arrow from the male connecting portion 7 to the female connecting portion 8 through the conductive rubber seal ring 17, and transmission is performed without any trouble.

FIG. 8 shows an example of a configuration of a transmission system. A drilling head 21 at the lower end of a drilling rod body 1 is provided with a detector 22 such as an inclinometer for detecting the tilting state of the head. The excavation mechanism 2 in which a signal is pushed in while rotating and driving the excavation rod body 1 through the transmission device 23 and the electric wire 6.
4 is connected to a transmission device 25 via a slip ring 26. The signal transmitted to the transmission device 25 is wirelessly transmitted from the radio device 27 to the antenna 31 of the radio device 30 of the ground equipment 29 via the antenna 28, the signal is processed by the conversion device 32, and input to the measurement device 33, and the measurement result Is broken and the excavation situation is grasped. Reference numeral 34 denotes a power supply.

In the illustrated embodiment, the male joint portion 2, the male connecting portion 7, and the male connecting portion 1 are provided at the upper end of the drill rod body 1.
0 indicates the case where the female joint portion 3, the female connecting portion 8, and the female connecting portion 13 are provided at the lower end, but the upper and lower relations thereof can be arbitrarily selected.

[0020]

As described above, according to the present invention, the connection of the electric signal path of the electric signal can be automatically performed in synchronism with the connection of the drill rod main body when the drill rod is extended.
Therefore, the connection work can be performed safely and efficiently. Further, since the electric wire protection tube is used as an electric circuit, the number of electric wires arranged in the excavation rod body can be reduced, and the configuration can be simplified. Furthermore, since a conductive seal ring is interposed between the male connection part and the female connection part of the electric wire protection tube, transmission failure does not occur even if there is a clearance for fitting between both connection parts. At the same time, earth and sand do not enter the electric wire protection tube, thereby improving the reliability of signal transmission.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view with a part cut away showing an embodiment of the present invention.

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a bottom view of the same.

4 (A) and 4 (B) are enlarged views of a main part of the present invention. FIG. 4 (A) is a sectional view of a part A of FIG. 1 and FIG.

FIG. 5 is a schematic cross-sectional view of a main part showing a state where a drill rod body is connected.

FIG. 6 is an enlarged sectional view of a main part of the same.

FIG. 7 is an enlarged sectional view of a part of a connecting portion of the electric wire protection tube.

FIG. 8 is a configuration diagram of a transmission system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling rod main body 2 Male joint part 3 Female joint part 4 Pin 5 Electric wire protection tube 6 Electric wire (positive side electric circuit) 7 Male connection part 8 Female connection part 9 Male connection member 10 Male connection part 11 Insulation material 12 Female connection member 13 Female Connection part 14 Insulation material 17 Conductive rubber seal ring (conductive seal ring) 21 Drilling head 22 Detector (inclinometer) 23, 25 Transmission device 24 Drilling mechanism 27, 30 Wireless device 29 Ground equipment

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hajime Fujii 1293, Tento-cho, Hanamigawa-ku, Chiba-shi, Chiba Chiba Plant

Claims (1)

[Claims] A hollow excavating rod body having a male joint at one end and a female joint at the other end, and is axially inserted and fixed in the hollow body, and has a male connection at one end and a male connection at the other end. A wire protection tube made of a conductive material having a female connection portion and carrying a negative side electric path, and inserted into the wire protection tube, having a male connection portion at one end and a female connection portion at the other end, and An electric wire that carries an electric path, and a conductive seal ring that can be in close contact with both the male connection portion and the female connection portion of the electric wire protection tube is interposed between the male connection portion and the female connection portion. A signal transmission device for a drilling rod, wherein a male / female connection part of a pipe and a male / female connection part of an electric wire are simultaneously connected.