JPH0726382B2 - Signal transmission method and signal repeater in cone penetration test - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to transmit various measurement signals from the inside of a cone at the tip of a boring rod to a data processing device on the ground in a cone penetration test for geological measurement without using a cable. And a signal repeater used in the method.

[0002]

2. Description of the Related Art A cone penetration tester is known as a device for measuring geology.

As shown in FIG. 7, this cone penetration tester presses the boring rod 1 into the ground A by means of a hydraulic device 2, and in the process of press fitting, various elements (cone penetration resistance, circumference) at the measuring point are measured. It is a device for measuring surface frictional resistance, pore water pressure, etc., and the tip of the boring rod 1 is a cone 101 having a built-in measuring unit 3, and the cone 101 penetrates into the ground A. The unit rods 102 are replenished one after another as the number goes by. The structural specifications of the cone 101 and the unit rod 102 are specified by JIS standard.

The boring rod 1 will be described in detail with reference to FIG.

The cone 101 is formed in a columnar shape with a tip 101A having a conical shape with a predetermined angle, and accommodates therein a measuring section 3 including various measuring sensors, a signal amplification amplifier, an operating power supply battery, and the like. And the female screw 10 is provided at the rear end portion 101B opposite to the conical tip portion 101A.
1C is cut to form a connecting portion with the unit rod 102.

Further, the unit rod 102 is formed in a hollow cylindrical shape, and the inner space 102A has both end portions 102B, 1B.
02C, a male screw 102D is cut on one end 102B to form a connecting portion with the cone 101 or another unit rod 102, and the other end 10B.
The female rod 102E is cut in 2C, and the unit rod 10
It forms a connecting portion between the two.

A cabtire cable is usually used as the signal cable 4 from the measuring unit 3 built in the cone 101, and the signal cable 4 is connected to the unit rod 1
Data processing device 5 through each internal space 102A of 02
(Fig. 7).

[0008]

The above-mentioned conventional cone penetration tester has the following problems because the measuring section 3 and the data processing device 5 are wire-connected by using a signal cable.

(A) Since the measurement is performed while press-fitting the boring rod 1 into the ground, the connection between the measuring unit 3 and the data processing device 5 must be maintained during the press-fitting operation of the boring rod 1. Therefore, it is necessary to fit the required number of unit rods 102 into the signal cable 4 in advance in a beaded manner, which is very troublesome to handle.

(B) Since the measurement is usually carried out in accordance with civil engineering work, it is necessary to use a friction resistant cable such as a cabtire cable for the signal cable 4, which is difficult to handle, and such a cable cannot be used. There is no guarantee that the disconnection of the signal cable 4 during the measurement will be completely eliminated even if is used.

(C) The signal cable 4 requires an extremely long cable having a boring depth or more, which is very troublesome to handle.

The present invention proposes to solve the above-mentioned problems, and a signal which enables transmission of a signal from a measuring portion in the cone at the tip of the boring rod in the boring rod without using a cable. It is an object to obtain a transmission method and a signal repeater used in this method.

[0013]

In order to solve the above-mentioned problems, according to the present invention, a wireless coupling type signal repeater is built in a unit rod, and the signal sending section and the signal receiving section of the signal repeater are described above. When the plurality of unit rods are connected to each other by arranging them in the two connecting portions of the unit rods (the connecting portions between the unit rods), the signal repeaters in the adjacent unit rods are connected to the respective signal transmitting / receiving units (the signal transmitting unit and the signal transmitting unit). By being wirelessly coupled to each other via the signal receiving section), a wireless coupling chain is formed by the signal repeaters in all the connected unit rods, and the signal from the measuring section in the cone is transmitted to the ground (through the wireless coupling chain). Data processing device).

[0014]

[Operation] Since the signal from the measuring part in the tip cone of the boring rod is wirelessly transmitted by the signal repeater in the connected unit rod, the signal cable is not required in the boring rod and is caused by the existence of the signal cable. The problems to be solved are solved.

[0015]

EXAMPLE An example of the present invention is shown in FIGS. 1 is an explanatory view of geological measurement by a cone penetration tester, FIG. 2 is a circuit diagram, FIGS. 3 (A) to 3 (D) are circuit diagrams of other examples, and FIG.
(A) and (B) are structural sectional views of the boring rod tip portion (cone and tip unit rod) and rear end portion (rear end unit rod and signal receiving cap), respectively. 6 is a sectional view of the structure of another embodiment, FIG.
4A and 4B are sectional views of the structure of another embodiment, and FIG.
The same parts as (A) and (B) are shown.

As shown in FIG. 1, by the hydraulic device 2,
The measuring method of press-fitting the boring rod 1 into the ground A while replenishing the unit rods 102 one after another is the same as the conventional one in the present invention, but the signal transmission method in the boring rod 1 is different from the conventional one.

That is, a wireless signal repeater 6 is provided in each unit rod 102, and the signal repeaters 6 in adjacent unit rods 102 are wirelessly coupled to each other. All the connected unit rods 102-1 to 102-N (subscripts "-1" to "-N" only when it is necessary to distinguish the unit rods from each other).
Attach. ), A wireless coupling chain is formed in a series coupling over, and the signal from the measuring unit 3 in the cone 101 is transmitted to the most advanced unit rod 102-1 and then the last unit via the wireless coupling chain. It is transmitted to the rod 102-N.

On the rearmost unit rod 102-N,
A signal receiving cap (hereinafter referred to as a cap) 7 is attached, and a signal cable 4 to a data processing device 5 is connected to the cap 7, and the unit rod 1
The signals transmitted up to 02-N are input to the data processing device 5 via the cap 7 and the signal cable 4.

As the measurement work progresses, the unit rod 1 at the rearmost end is measured.
When adding the unit rod 102 to 02-N,
After removing the cap 7 from the unit rod 102-N and connecting a new unit rod 102 to the unit rod 102-N, the cap 7 is attached to the new unit rod 102. This operation is repeated every time the unit rod 102 is added.

The circuit configuration of the embodiment will be described with reference to FIG.

Cutting-edge cone 10 of boring rod 1
The measuring unit 3 is housed in the measuring unit 1. The measuring unit 3 outputs a data transmission unit 301 that outputs various geological measurement data, and a signal (measurement data) output from the data transmission unit 301.
An amplifier 302 that amplifies the signal, and outputs the signal amplified by the amplifier 302 to the unit rod 102 (the tip unit rod 102-
1) An electromagnetic coil 303 that constitutes a signal transmitting unit for transmitting, a capacitor 304 that is connected in parallel with the electromagnetic coil 303 to configure a resonance circuit to increase a signal transmission efficiency, a data transmitting unit 301, and an amplifier 302. Driving battery 305.

The data transmission unit 301 includes various sensors for measuring various geological elements and a modulator for modulating data from the various sensors into a signal in a transmission form. The modulator has, for example, a carrier frequency of 50 KHZ to 1 MHZ. Use FM modulator. Further, when there are a plurality of types of data, the data is time division FM modulated and transmitted. The data transmission form may be converted into an analog signal form (that is, a signal form from various sensors) or a digital signal form.

Each of the unit rods 102 which are connected in series and form an intermediate portion of the boring rod 1 includes:
The signal repeater 6 is housed therein, and the signal repeater 6 constitutes an electromagnetic coil 601 which constitutes a signal receiving unit for receiving a signal from the measuring unit 3 in the cone 101 or a signal from the signal repeater 6 in the preceding stage. An amplifier 602 for compensating the signal attenuation by amplifying the signal received by the electromagnetic coil 601 and transmitting it to the subsequent stage, and a signal amplified by the amplifier 602 in the signal repeater 6 or the cap 7 in the next stage. Electromagnetic coil 603 constituting a signal transmitting section for transmitting to electromagnetic coil 701, capacitors 604, 605, and capacitors 604, 605 connected in parallel with electromagnetic coils 601 and 603 to form a resonance circuit in order to improve signal transmission efficiency. The amplifier 602
Driving battery 606.

The cap 7 is a signal repeater 6 in the unit rod 102-N connected to the rearmost end of the boring rod 1.
Electromagnetic coil 701 for receiving a signal sent from
A capacitor 702 is connected in parallel with the electromagnetic coil 701 in order to increase the signal transmission efficiency, and the electromagnetic coil 701 is connected to the signal cable 4 for inputting a signal to the data processing device 5.

The electromagnetic coils 303 of the respective parts described above,
The coils 601, 603, and 701 are composed of, for example, coils wound around a pot core, but may be composed of air-core coils when the signal frequency is set relatively high. Also, the electromagnetic coils 303, 601, 603,
701 and capacitors 304, 604 connected in parallel
605 and 702 may not be used depending on the setting of the signal transmission bandwidth (for example, when the bandwidth is wide).

The circuit operation will be described. In the measuring section 3 in the cone 101, the measurement signal based on the FM modulation signal output from the data sending section 301 is amplified by the amplifier 302 and then applied to the electromagnetic coil 303. . The signal applied to the electromagnetic coil 303 is electromagnetically coupled to the first stage signal repeater 6 (the most advanced unit rod 102-1).
Signal is transmitted to the electromagnetic coil 601 of the signal repeater).

In the signal repeater 6 in the first stage, the signal received by the electromagnetic coil 601 is amplified by the amplifier 602 in the attenuation amount of the signal during the transmission between the electromagnetic coil 303 and the electromagnetic coil 601. After that, it is applied to the electromagnetic coil 603. The signal applied to this electromagnetic coil 603 is
The signal is transmitted to the electromagnetic coil 601 of the second-stage signal repeater 6 (the signal repeater in the unit rod 102-2 connected to the unit rod 102-1) by electromagnetic coupling, and thereafter from the measuring unit 3 in the same manner. Signal of each unit rod 1 connected
The signal is sequentially relayed to the signal relay 6 in 02 to reach the electromagnetic coil 701 in the cap 7, and is input to the data processing device 5 via the signal cable 4. In this way, the signals from the measuring unit 3 are transmitted to the connected unit rods 102-1 to 102-.
Each of the signal repeaters 6 in N is wirelessly coupled in series and is transmitted to the data processing device 5 through a wireless coupling chain.

Next, the circuit configuration of another embodiment will be described with reference to FIG.

FIG. 3A shows an embodiment in which the amplifier 602 is removed from the signal repeater 6 of the embodiment described in FIG. 2, and the electromagnetic coil 601 which constitutes the signal receiving portion and the electromagnetic coil which constitutes the signal transmitting portion. 603 and 603 are coupled by a capacitor 606. In this embodiment, although there is no attenuation compensation function at the time of signal transmission, the amplifier 602 and the battery 606 are unnecessary, so that the circuit configuration is simple and inexpensive.

When the amplifier 602 of the signal repeater 6 described in FIG. 2 is configured to compensate the signal attenuation for K stages, the signal repeater 6 in the unit rod 102 to be connected is , K of them can be used as the signal repeater shown in FIG. 2, and (K-1) can be used as the signal repeater shown in FIG. 3A, and the boring rod 1 can be constructed at low cost. It becomes possible to do. Further, when the level of the signal output from the measuring unit 3 in the cone 101 is sufficiently high, or when the unit rod 102 is devised so as to have a small amount of attenuation when signals are exchanged, the amplifier 602 is provided. It is not necessary to use the signal repeater 6 having the amplifier 602, or the signal repeater 6 can be reduced, or depending on the measurement conditions (for example, when the number of connected unit rods 102 is small when measuring shallow depth). Figure 3
It is also possible to use the signal repeater 6 shown in FIG.

In the above embodiments, the electromagnetic coupling means (electromagnetic coil) is used as the wireless transmission / reception means of the signal, but an optical coupling means can be used as the wireless transmission / reception means of the signal. An embodiment using this optical coupling means is shown in FIG.
Shown in (B) and (C).

In the embodiment shown in FIGS. 3B and 3C, the signal receiving portion is composed of a semiconductor light receiving element, specifically a phototransistor 607, and the signal transmitting portion is a semiconductor light emitting element, specifically, a semiconductor light emitting element. It is composed of a light emitting diode 608,
The embodiment shown in FIG. 3B has an amplifier 602 and has a signal attenuation compensation function, and the embodiment shown in FIG. 3C has an amplifier 602 and does not have a signal attenuation compensation function. Also in this embodiment, as in the embodiment shown in FIG. 2 and FIG. 3A, only the one shown in FIG.
It is possible to mix and use the ones of (B) and (C), and it is also possible to use only the one of FIG. 3C depending on conditions.

In the embodiment using the phototransistor 607 and the light emitting diode 608, as shown in FIG. 3C, even if the amplifier 602 is not provided, the phototransistor 607 and the light emitting diode 60 are provided.
A battery 606 is required to drive the eight.

As a matter of course, as shown in FIG.
When the signal repeater 6 of the embodiment shown in (C) is used, the signal from the measuring unit 3 in the cone 101 must also be output via the light emitting diode, and further the cap 7
The signal receiving means inside must also be composed of phototransistors. Since these structures can be easily understood by replacing the electromagnetic coil 303 with a light emitting diode and the electromagnetic coil 701 with a phototransistor in FIG. 2, detailed description thereof will be omitted. It should be noted that a photodiode may be used in place of the phototransistor on the light receiving side with a slight circuit change.

As yet another embodiment using the optical coupling means, for example, a light guide made of a plastic optical fiber can be used. That is, the light guide is arranged inside the unit rod 102 such that both end faces of the light guide in the light transmitting direction (lens units are normally attached to the both end faces) are arranged at two connecting portions of the unit rod 102. It is configured so that a signal output from the measuring unit 3 in the cone 101 and using light as a medium is relayed by the light guide in the unit rod 102. With this configuration, the battery 606 is not required, and no electric circuit component is required, so that the configuration is further simplified. In this configuration, of course, since there is no signal attenuation compensation function, the same method of use as in the embodiment of FIG. 3C is used.

In the embodiment described above, the battery 60
A lithium battery is used for 6. The capacity of this lithium battery is relatively large (for example, 800 mA · H). For example, in the signal repeater 6 shown in FIG. 2, if optimally configured, the idle current is 30 μA and the driving current (current when the signal is input). Can be set to about 2 mA. In this way, the battery 606 can be used for about 3 years if the unit rod 102 is only stored, and if the unit rod 102 is used for 1 hour per day, the battery 606 can be used for about 10 months. Since the battery 606 can be used for a long time, the number of times of replacement of the battery 606 can be very small. However,
It is also possible to further extend the life of the battery 606 or use an inexpensive battery with a small capacity.
It shows in (D).

In FIG. 3D, 610 is a battery 606.
Is a switch which is inserted and connected to a current supply path from the device, and the switch 610 is, for example, a tilt-sensitive switch formed by hermetically sealing two contact members and mercury in an insulating container. When the unit rod 102 is in the posture for storage (usually, when it is awed horizontally), the switch 610 is turned off and the power-supplied circuit portion 61 is turned off.
1 (the amplifier 602 or / and the phototransistor 607 and the light emitting diode 608 of the above-described embodiment) includes a battery 60.
When the current from 6 does not flow and the unit rod 102 is used, that is, when the unit rod 102 is in the posture of press-fitting into the ground (usually, when it is erected vertically), the switch 610 is turned on and A current from the battery 606 flows through the power-supplied circuit portion 611. The embodiment shown in FIG. 3D can also be implemented for the battery 305 in the measuring unit 3.

Next, the structure of the embodiment will be described.

FIGS. 4 (A) and 4 (B) show the structure of the embodiment shown in FIG. 2 or the embodiment shown in FIG. 3 (A).

At the tip of the bowling rod 1, there is a cone 1.
01, the cap 7 is connected to the rear end, and the required number N of unit rods 102 (the number N is increased as the measurement progresses) is connected between the cone 101 and the cap 7. To be done.

Explaining the cone 101, the structural shape thereof (the shape described with reference numerals 101A to 101C in FIG. 8) and the fact that the measuring unit 3 is provided inside the cone 101 are the same as those in the conventional example. Is the same as.

The measurement section 3 includes a data transmission section 3 shown in FIG.
01, the amplifier 302, the battery 303, the electromagnetic coil 303, which is a signal sending portion, is provided at the center of the inner bottom surface 101D of the portion (the connection portion with the unit rod 102) of the rear end portion 101B provided with the female screw 101C. Installed.

The electromagnetic coil 303 is, for example, the pot core 3
A coil 303B is wound around 03A and is attached to the bottom surface 101D so that an opening surface of the pot core 303A faces an electromagnetic coil 601 of the unit rod 102 described later.

Next, the unit rod 102 will be described. Its structural shape (in FIG. 8, reference numerals 102A to 102A).
02E) is similar to the above-mentioned conventional example, but is different from the conventional example in that the signal repeater 6 is housed in the internal space 102A.

In the signal repeater 6, electromagnetic coils 601 and 603 of the cone 101 are fixedly attached to both ends of a case 614 formed of, for example, a plastic pipe material, and an amplifier 602, capacitors 604 and 605, and a battery 6 are provided therein.
06 and the like are housed and configured so that they can be inserted into the internal space 102A of the unit rod 102.

When the signal repeater 6 is inserted into the unit rod 102, the end portion 102B (cone 101 or other unit rod 10) provided with the male screw 102D of the unit rod.
The electromagnetic coil 601 of the signal repeater 6 is arranged at the center of the tip of the connection part 2) with the opening surface of the pot core thereof facing outward.
It constitutes a receiving unit for a signal transmitted from the signal repeater 6 in the measuring unit 3 or another unit rod 102 therein.

Further, the end portion 10 provided with the internal thread 102E.
The electromagnetic coil 603 of the signal repeater 6 is arranged in the same direction as the above in the center of the inner bottom surface of 2C (the connecting portion with the other unit rod 102 or the cap 7). The signal repeater 6 in the 102 or the signal receiving section (electromagnetic coil 701) of the cap 7 constitutes a signal sending section.

Next, the cap 7 will be described. In the cap 7, a hole 704 having an outer diameter equal to the outer diameter of the unit rod 102 is formed at the end 703, and the end 102C of the unit rod 102 is formed at the center of the bottom surface of the hole 704. Female screw 1
A cylindrical portion 705 having an outer diameter slightly smaller than the inner diameter (diameter between threads) of 02E is formed, and an electromagnetic coil 701 having the same structure as the above is attached to the tip of the cylindrical portion 705 to receive a signal transmitted from the unit rod 102. Make up part.

The electromagnetic coil 701 has a capacitor 70.
2 are connected in parallel and a signal cable 4 is connected, and the signal cable 4 is led out from the side surface of the cap 7 via a protective bushing 706.

The cone 101, the unit rod 102, and the unit rod 102 described above are connected by screwing, and the unit rod 102 and the cap 7 are connected by fitting. In the connected state, the electromagnetic coils 303 and 603 on the signal sending side and the electromagnetic coil 60 on the signal receiving side
1, 701 face each other with a slight gap.

Further, in consideration of the intrusion of groundwater into the boring rod 1 during the measurement, the impact at the time of measurement, etc., the measuring section 3 and its electromagnetic coil 303, the signal relay 6 and the electromagnetic coils 601, 603, and the cap 7 are taken into consideration. The electromagnetic coil 701 of
Waterproof and shockproof.

The structure of the unit rod 102 when the signal repeater 6 described in FIG. 3A is used is shown in FIG.
Although the structure is the same as that shown in (A) and (B), capacitors 604 to 60 are provided inside the case 614 of the signal repeater 6.
Only 6 is stored, and the configuration is extremely simple.

The structure of the signal repeater 6 in the case of using the signal repeater 6 described in FIG. 3 (B) or (C) is as shown in FIGS. 4 (A) and 4 (B). At the mounting position of the electromagnetic coil 601, a phototransistor 607 is mounted in place of the electromagnetic coil 601, and at the mounting position of the electromagnetic coil 603 on the signal transmission unit side, the electromagnetic coil 60 is mounted.
The light emitting diode 608 is attached in place of 3, and the case 61
4 has an amplifier 602, a battery 606 and a resistor 612 inside.
613 (in the case of FIG. 4C, the battery 606, the resistor 61)
2, 613) etc. are stored.

Further, in the case of the signal repeater 6 described with reference to FIG. 3 (D), in addition to the above-mentioned electric parts, a tilt-sensitive type mercury switch (switch 61) is provided inside the case 614.
0) is attached and stored in such a direction that the unit rod 102 is turned off when the unit rod 102 is horizontally bent and turned on when the unit rod 102 is vertically set.

Next, the embodiment shown in FIG. 5 will be described. This embodiment can be carried out both when the electromagnetic coil is used for the signal receiving portion and the signal transmitting portion and when the semiconductor light receiving element and the semiconductor light emitting element are used. FIG. 5 shows an example using the electromagnetic coil. It is shown.

The difference between this embodiment and the embodiment described with reference to FIGS. 4A and 4B is that two electromagnetic coils 601 and 6 are used.
This is a point in which 03 is closely abutted against each other by an elastic force to eliminate a gap between them.

That is, the electromagnetic coil 60 on the signal transmission side
3 is attached to one end of a case 614 through a mounting member 615 formed of an elastic member such as rubber. With this structure, the electromagnetic coil 603 is attached to the case 6 described above.
Using the inner wall surface of 14 as a guide, a slight elastic force is applied in the longitudinal direction of the case 614, that is, in the connecting direction of the unit rods 102, and the case 614 is attached. Then, in one unit rod 102, two electromagnetic coils 60
The delivery dimension between the opening surfaces of the pot cores 1 and 603 (the delivery dimension before connecting the unit rods to each other) is the delivery dimension between the connecting surfaces of the unit rods 102 (the dimension indicated by L in FIG. 4A). If the unit rods 102 are connected to each other with a slightly longer length, the delivery dimension between the pot core opening surfaces is compressed to the dimension L, and the two electromagnetic coils 601 and 603 are elastically and closely butted. Become.

Further, in FIG. 5, both electromagnetic coils 6
01 and 603 may be attached via the elastic attaching member 615 similar to the above.

In the embodiment shown in FIG. 5, the signal repeater 6
Since no structural void is formed in the mutual coupling portion, the signal attenuation during signal transmission / reception can be extremely reduced. Therefore, it is possible to use a large number of unit rods 102 that incorporate the signal repeater 6 that does not use the amplifier 602 (depending on the measurement conditions, all unit rods 102 without amplifiers can be used), and the measurement cost is low. There are advantages.

In the case of constructing the signal repeater 6 with the structure shown in FIG. 5, the signal transmitting section (the electromagnetic coil 303 or a light emitting diode instead of the electromagnetic coil 303) of the measuring section 3 in the cone 101 and / or the cap 7 are provided. If the signal receiving portion (the electromagnetic coil 701 or the phototransistor in place of it) has an elastic mounting structure as shown in FIG. 5, even in the connecting portion between the cone 101 and the unit rod 102 and the connecting portion between the unit rod 102 and the cap 7. This is more effective because no gap is formed between the signal sending unit and the signal receiving unit.

Next, the embodiment shown in FIGS. 6A and 6B will be described.

In all the embodiments described so far, the signal repeater 6 composed of electric parts is used in the unit rod 102, but in the embodiments shown in FIGS. 6 (A) and 6 (B). , Realizes signal relay function without using electrical parts.

That is, the internal space 1 of the unit rod 102
02A contains a light guide 8 made of a plastic optical fiber having lens units 801 fitted at both ends, and the optical signal output from the light emitting diode 306 from the measuring unit 3 of the cone 101 is the unit rod. Light input end face 80 of light guide 8 in 102
2 is transmitted to the inside of the light guide 8, is emitted from the light output end face 803, and this operation is repeated in each connected unit rod 102, and is a signal receiving portion of the cap 7. The signal reaches the transistor 707, is converted into an electrical signal here, and is input to the data processing device 5 via the signal cable 4.

In this embodiment, the cap 7 needs a driving means for the phototransistor 707, and the driving circuit 708 for that is housed in the cap 7.

Although this embodiment does not require electric circuit parts, it can be constructed very simply and inexpensively, but since attenuation compensation of optical signals is not performed, in the measurement using a large number of unit rods 102, It is necessary to use the unit rod 102 described in 3 (B) together.

Also in this embodiment, since the plastic optical fiber has flexibility, the same structure as that of the embodiment described with reference to FIG. 5, that is, the light guide 8 is used.
It is also possible to adopt a structure in which one or both of the light input / output both end faces 802, 803 are attached by applying an elastic force.

[0067]

As described above, according to the present invention, a wireless coupling chain formed by signal relays in all connected unit rods by incorporating a wireless relay type signal relay in a unit rod. The signal from the measuring unit in the cone is transmitted to the data processing device on the ground via the cone.Since the signal cable is not required in the boring rod, the measuring instrument is easy to handle and the measurement work is easy. Can be performed very easily and efficiently.

Further, since the signal cable is not required in the boring rod where the signal cable disconnection frequently occurs, the signal cable disconnection hardly occurs.
There is almost no need to repeat the measurement. (Repeating the work of pressing the boring rod into the ground is very troublesome, and when performing the measurement again, it is necessary to shift the measurement point. It may be impossible.)

Further, a plurality of types of unit rods, for example, a unit rod having a signal attenuation compensation function and a unit rod not having this function can be mixed, so that the unit of measurement is taken into consideration in consideration of measurement conditions such as depth to be measured. By optimally setting the combination of rods, it becomes possible to perform geological measurement at a low measurement cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of geological measurement by a cone penetration tester according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of this embodiment.

FIG. 3A to FIG. 3D are circuit diagrams of this embodiment.

4A and 4B are cross-sectional views showing the structure of this embodiment.

FIG. 5 is a cross-sectional view of an essential part showing the structure of the present embodiment.

6A and 6B are cross-sectional views showing the structure of this embodiment.

FIG. 7 is an explanatory diagram of geological measurement by a conventional cone penetration tester.

FIG. 8 is a sectional view showing a structure of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Boring rod 101 ... Cone 102 ... Unit rod 102B, 102C ... End part 3 ... Measuring part 301 ... Data sending part 303 ... Electromagnetic coil 306 ... Light emitting diode 5 ... Data processing device 6 ... Signal repeater 601, 603 ... Electromagnetic coil 602 ... Amplifier 606 ... Driving battery 607 ... Phototransistor 608 ... Light emitting diode 610 ... Inclination-sensitive switch 615 ... Elastic mounting member 7 ... Signal receiving cap 701 ... Electromagnetic coil 707 ... Phototransistor 8 ... Light guide 802 ... Light input end surface 803 ... Optical output end face

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Seiji Katagiri 2-5-7 Koishikawa, Bunkyo-ku, Tokyo Meisei Electric Co., Ltd. (72) Inventor Hisaichi Oi 2-5-7 Koishikawa, Bunkyo-ku, Tokyo Meisei Electric Co., Ltd. (56) Reference JP-A-58-135935 (JP, A) JP-A-50-120110 (JP, A)

Claims (7)

[Claims] 1. A cone penetration test, in which unit cones are successively inserted into a cone having a built-in measuring unit, the cones are press-fitted into the ground, and various geological measurements are performed in the process of press-fitting the cones. A wireless coupling type signal repeater is built in the unit rods, and a signal sending unit and a signal receiving unit of the signal repeater are respectively arranged in two connecting portions that connect the unit rods, and a plurality of unit rods are provided. When individually connected, the signal repeaters in the adjacent unit rods are wirelessly coupled to each other through the respective signal transmitters and signal receivers, so that the signal repeaters in all the connected unit rods are wirelessly connected. A bond chain is formed,
A signal transmission method in a cone penetration test, wherein a signal output from the measurement unit in the cone is transmitted to the data processing device on the ground through the wireless coupling chain. 2. A signal repeater used in the signal transmission method according to claim 1, further comprising a signal sending unit and a signal receiving unit, each of which is an electromagnetic coil arranged at each of two connecting portions connecting the unit rods. Signal repeater having. 3. A signal repeater for use in the signal transmission method according to claim 1, wherein the signal sending unit is a semiconductor light emitting device arranged at one of two connecting units for connecting the unit rods to each other. A signal repeater having a signal receiving portion formed of a semiconductor light receiving element arranged on the other side of the connecting portion, and a battery for driving the semiconductor light emitting element and the semiconductor light receiving element. 4. The signal relay used in the signal transmission method according to claim 1, wherein the signal relay comprises light guides having two end faces arranged in a light transmitting direction at two connecting portions connecting unit rods to each other. vessel. 5. The signal repeater according to claim 2, further comprising an amplifier for compensating for signal attenuation provided between the signal transmitting section and the signal receiving section, and a battery for driving the amplifier. 6. One or both of the signal sending unit and the signal receiving unit are attached to a member having an elastic force in the connecting direction of the unit rods, and the signal sending unit of the signal repeater of one connected unit rod. The signal repeater according to claim 2, 3 or 4, wherein the signal receiving portion of the signal repeater of the other unit rod is elastically and closely contacted by the elastic force. 7. The signal repeater according to claim 3, further comprising a tilt-sensitive switch which is turned on by the press-fitting posture of the unit rod and starts supplying current from the driving battery.